Patent US2939945A successfully refreshed from Google Patents.
Patent US4078882A successfully refreshed from Google Patents.
US4078882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burning of pulverous or granular raw materials
Assignee: FLSmidth and Co AS
•
Filing: 1976-05-14
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Granted: 1978-03-14
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Expires: 1996-05-14
Abstract
Abstract A method is disclosed for burning pulverous or granular raw material such as cement raw meal in a rotary kiln plant by directing a first flow of raw material to a cyclone preheater, preheating the first flow of raw material in the cyclone preheater, and directing the preheated raw material from the cyclone preheater to a rotary kiln for burning the material in the kiln. The burnt kiln product is directed to a cooler which may be of several types and which communicates with the material outlet of the kiln while a second flow of fresh raw material is directed to the cooler to at least partially cool the burnt kiln product by transferring heat therefrom to the second flow of fresh raw material in the cooler. The method further involves combining the preheated, at least partially calcined second flow of material with the first flow of preheated, at least partially calcined material prior to directing the combined flows to the rotary kiln and thereafter directing the combined flows to the kiln for burning and for subsequent cooling in the cooler. The invention also pertains to a unique kiln plant for practicing the inventive method.
Inventors
- 👤 Rolf Dietrich Houd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:43
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/38; F27B7/383; C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; F27B7/2016; F27B7/2025; F27B7/2033; Y; Y02; Y02P; Y02P40/00; Y02P40/10; Y02P40/121
Claims Analysis
Total Claims: 66
Claim 1
Independent Claim
244 words
A method of burning pulverous or granular raw material in a kiln plant comprising: (a) directing a first flow of raw material to a preheating means; (b) preheating the first flow of raw material in said preheating means; (c) directing said preheated material from said preheating means to a kiln; (d) burning said preheated material in said kiln; (e) directing the burnt kiln product from said kiln to a cooling means communicating with the outlet portion of the kiln, said cooling means having cooling air passing therethrough; (f) discharging a second flow of fresh raw material directly into said cooling means proper so as to contact at least one of heated cooling air and burnt kiln product therein; (g) at least partially cooling said burnt kiln product from said kiln in said cooling means by transferring heat therefrom to at least one of said cooling air and said second flow of fresh raw material in said cooling means while simultaneously preheating and at least partially calcining said second flow of fresh raw material by the transferred heat in said cooling means; (h) combining the preheated, at least partially calcined second flow of material with the first flow of at least partially preheated, at least partially calcined material prior to directing said combined flows of material to the kiln; and (i) directing said combined flows of at least partially preheated material to said kiln for burning therein and for subsequent cooling in said cooling means.
Claim 2
Independent Claim
244 words
A method of burning pulverous or granular raw material in a kiln plant comprising: (a) directing a first flow of raw material to a preheating means; (b) preheating the first flow of raw material in said preheating means; (c) directing said preheated material from said preheating means to a kiln; (d) burning said preheated material in said kiln; (e) directing the burnt kiln product from said kiln to a cooling means communicating with the outlet portion of the kiln, said cooling means having cooling air passing therethrough; (f) discharging a second flow of fresh raw material directly into said cooling means proper so as to contact at least one of heated cooling air and burnt kiln product therein; (g) at least partially cooling said burnt kiln product from said kiln in said cooling means by transferring heat therefrom to at least one of said cooling air and said second flow of fresh raw material in said cooling means while simultaneously preheating and at least partially calcining said second flow of fresh raw material by the transferred heat in said cooling means; (h) combining the preheated, at least partially calcined second flow of material with the first flow of at least partially preheated, at least partially calcined material prior to directing said combined flows of material to the kiln; and (i) directing said combined flows of at least partially preheated material to said kiln for burning therein and for subsequent cooling in said cooling means.
Claim 3
Independent Claim
228 words
A method of burning pulverous or granular raw material in a kiln plant having means for preheating the raw material, a kiln for burning the preheated raw material, and means for cooling the kiln product by cooling air comprising: (a) directing a first flow of fresh raw material to said preheating means; (b) preheating the first flow of raw material in said preheating means; (c) discharging a second flow of fresh raw material into said cooling means proper so as to contact at least one of heated cooling air and burnt kiln product therein thereby preheating said raw material by heat transferred from the burned kiln product in said cooling process of the cooling means; (d) combining at least a portion of said first and second preheated raw material flows; (e) directing the combined preheated raw material flows to said kiln; (f) burning said raw material in said kiln; (g) directing the kiln product directly to said cooling means; (h) cooling the kiln product in said cooling means by transferring at least a portion of the heat from the kiln product to at least one of said cooling air and said second flow of raw material in said cooling means while simultaneously preheating said second flow of fresh raw material by the transferred heat in said cooling means; and (i) removing the kiln product from said cooling means.
Claim 4
Independent Claim
228 words
A method of burning pulverous or granular raw material in a kiln plant having means for preheating the raw material, a kiln for burning the preheated raw material, and means for cooling the kiln product by cooling air comprising: (a) directing a first flow of fresh raw material to said preheating means; (b) preheating the first flow of raw material in said preheating means; (c) discharging a second flow of fresh raw material into said cooling means proper so as to contact at least one of heated cooling air and burnt kiln product therein thereby preheating said raw material by heat transferred from the burned kiln product in said cooling process of the cooling means; (d) combining at least a portion of said first and second preheated raw material flows; (e) directing the combined preheated raw material flows to said kiln; (f) burning said raw material in said kiln; (g) directing the kiln product directly to said cooling means; (h) cooling the kiln product in said cooling means by transferring at least a portion of the heat from the kiln product to at least one of said cooling air and said second flow of raw material in said cooling means while simultaneously preheating said second flow of fresh raw material by the transferred heat in said cooling means; and (i) removing the kiln product from said cooling means.
Claim 5
Independent Claim
331 words
A method of burning pulverous or granular raw material in a kiln plant having a kiln for burning the material therein, preheating means communicating with the material inlet end of the kiln for preheating fresh raw material prior to being subjected to a final burning process in the kiln, cooling means communicating with the material outlet end portion of the kiln for cooling the hot kiln product by means of atmospheric air directed to said cooling means comprising: (a) directing a flow of fresh raw material to the kiln plant; (b) dividing the flow of raw material into at least two streams; (c) directing a first stream of said fresh raw material to said preheating means for preheating and at least partially calcining therein prior to being subjected to a final burning process in the kiln; (d) discharging said second stream of fresh raw material directly into said cooling means proper so as to contact at least one of heated cooling air and burnt kiln product therein, thereby subjecting said second flow of fresh raw material to a preheating and at least partial calcination therein by means of heat transferred from the burnt kiln product prior to subjecting said second stream of material to a final burning process in the kiln; (e) combining said second stream of preheated, at least partially calcined raw material from said cooling means with said first stream of preheated, at least partially calcined raw material from said preheating means prior to directing the raw material to a final burning process in said kiln; (f) directing said combined flow of preheated, at least partially calcined raw material to said kiln; (g) burning said material in said kiln; (h) directing the burnt kiln product to said cooling means for cooling; (i) directing said kiln product from said kiln to said cooling means so as to be subjected to a cooling process therein; and (j) directing the at least partially cooled burnt kiln product away from said cooling means.
Claim 6
Independent Claim
331 words
A method of burning pulverous or granular raw material in a kiln plant having a kiln for burning the material therein, preheating means communicating with the material inlet end of the kiln for preheating fresh raw material prior to being subjected to a final burning process in the kiln, cooling means communicating with the material outlet end portion of the kiln for cooling the hot kiln product by means of atmospheric air directed to said cooling means comprising: (a) directing a flow of fresh raw material to the kiln plant; (b) dividing the flow of raw material into at least two streams; (c) directing a first stream of said fresh raw material to said preheating means for preheating and at least partially calcining therein prior to being subjected to a final burning process in the kiln; (d) discharging said second stream of fresh raw material directly into said cooling means proper so as to contact at least one of heated cooling air and burnt kiln product therein, thereby subjecting said second flow of fresh raw material to a preheating and at least partial calcination therein by means of heat transferred from the burnt kiln product prior to subjecting said second stream of material to a final burning process in the kiln; (e) combining said second stream of preheated, at least partially calcined raw material from said cooling means with said first stream of preheated, at least partially calcined raw material from said preheating means prior to directing the raw material to a final burning process in said kiln; (f) directing said combined flow of preheated, at least partially calcined raw material to said kiln; (g) burning said material in said kiln; (h) directing the burnt kiln product to said cooling means for cooling; (i) directing said kiln product from said kiln to said cooling means so as to be subjected to a cooling process therein; and (j) directing the at least partially cooled burnt kiln product away from said cooling means.
Claim 7
Dependent Claim
28 words
The method according to claim 3 further comprising uniting the two preheat-treated flows of material when both material flows have attained substantially the same degree of heat treatment.
Claim 8
Dependent Claim
16 words
The method according to claim 3 further comprising directing lime-containing raw material to said kiln plant.
Claim 9
Dependent Claim
16 words
The method according to claim 4 further comprising directing lime-containing raw material to said kiln plant.
Claim 10
Dependent Claim
34 words
The method according to claim 5 further comprising directing said second flow of material to said cooling means and subjecting said second flow of material to a preheating and at least partial calcining therein.
Claim 11
Dependent Claim
57 words
The method according to claim 3 further comprising: (a) uniting said two flows of material in a calciner coupled to the preheating means; and (b) producing heat in said calciner for at least partially calcining said material by burning fuel added locally in the presence of oxygen contained in the spent cooling air from the cooling means.
Claim 12
Dependent Claim
57 words
The method according to claim 4 further comprising: (a) uniting said two flows of material in a calciner coupled to the preheating means; and (b) producing heat in said calciner for at least partially calcining said material by burning fuel added locally in the presence of oxygen contained in the spent cooling air from the cooling means.
Claim 13
Dependent Claim
57 words
The method according to claim 7 further comprising: (a) uniting said two flows of material in a calciner coupled to the preheating means; and (b) producing heat in said calciner for at least partially calcining said material by burning fuel added locally in the presence of oxygen contained in the spent cooling air from the cooling means.
Claim 14
Dependent Claim
39 words
The method according to claim 3 further comprising conveying said second flow of material to be united with said first flow of material when said second flow of material is suspended in spent cooling air from said cooling means.
Claim 15
Dependent Claim
39 words
The method according to claim 5 further comprising conveying said second flow of material to be united with said first flow of material when said second flow of material is suspended in spent cooling air from said cooling means.
Claim 16
Dependent Claim
39 words
The method according to claim 7 further comprising conveying said second flow of material to be united with said first flow of material when said first flow of material is suspended in spent cooling air from said cooling means.
Claim 17
Dependent Claim
52 words
The method according to claim 3 further comprising: (a) initially mixing with the kiln product, said second flow of material; (b) treating said second flow of material together with the product in said cooling means; and (c) separating from the kiln product the treated material by suspending the material in cooling air.
Claim 18
Dependent Claim
52 words
The method according to claim 5 further comprising: (a) initially mixing with the kiln product, said second flow of material; (b) treating said second flow of material together with the product in said cooling means; and (c) separating from the kiln product the treated material by suspending the material in cooling air.
Claim 19
Dependent Claim
52 words
The method according to claim 7 further comprising: (a) initially mixing with the kiln product, said second flow of material; (b) treating said second flow of material together with the product in said cooling means; and (c) separating from the kiln product the treated material by suspending the material in cooling air.
Claim 20
Dependent Claim
79 words
The method according to claim 14 further comprising: (a) feeding the second flow of material to at least one of the hotter parts of said cooling means and the precooling zone of said kiln; (b) mixing said material with the kiln product in the hotter part of the cooling means in a manner to preheat and at least partially calcine said material; and (c) subsequently suspending said material in cooling air thereby separating the material from the kiln product.
Claim 21
Dependent Claim
83 words
The method according to claim 14 further comprising: (a) mixing the second flow of material fed to said cooling means with the kiln product in the cooler part of the cooling means; (b) separating said material from the kiln product by suspending it in cooling air; and (c) at least partially calcining said material by means of heat given off by the kiln product in the hotter part of the cooler while said material passes through the hotter portion of the cooling means.
Claim 22
Dependent Claim
26 words
The method according to claim 3 further comprising suspending said second flow of material in atmospheric air prior to passing said material to said cooling means.
Claim 23
Dependent Claim
26 words
The method according to claim 5 further comprising suspending said second flow of material in atmospheric air prior to passing said material to said cooling means.
Claim 24
Dependent Claim
26 words
The method according to claim 7 further comprising suspending said second flow of material in atmospheric air prior to passing said material to said cooling means.
Claim 25
Dependent Claim
26 words
The method according to claim 8 further comprising suspending said second flow of material in atmospheric air prior to passing said material to said cooling means.
Claim 26
Dependent Claim
119 words
The method according to claim 19 further comprising directing a substantial portion of material of said second material flow through said cooling means while suspended in a combined atmospheric air flow, at least one component of said air flow being the air flow utilized to carry the second flow of material to said cooling means and the other component being the air flow utilized inside said cooling means for cooling the final kiln product, at least a portion of said combined atmospheric air flow simultaneously constituting the heated spent cooling air which is thereafter directed through said preheating means, and the carrying means serving to carry the preheat-treated second flow of material to the preheat-treated first flow of material.
Claim 27
Dependent Claim
29 words
The method according to claim 23 further comprising directing a second material flow constituting between 5 and 40% of the total amount of material fed to the kiln plant.
Claim 28
Independent Claim
248 words
A method of burning pulverous or granular raw material in a kiln plant having a preheating unit for preheating the raw material, a rotary kiln for burning the preheated material, and means for cooling the kiln product by cooling air directed through the cooling means, comprising: (a) directing a first flow of fresh raw material to said preheating unit, said preheating unit being in the form of a multistage cyclone preheating unit; (b) successively directing the preheated raw material to each stage of said preheating unit; (c) preheating the first flow of fresh raw material in said preheating unit; (d) discharging a second flow of fresh raw material into said cooling means proper to contact heated cooling air therein and thereby preheat said second flow of fresh raw material by heat transferred from the spent cooling air thereto; (e) combining at least a portion of said first and second preheated raw material flows; (f) directing the combined preheated raw material flows to said rotary kiln; (g) burning said raw material in said rotary kiln; (h) directing the burned kiln product directly to said cooling means; (i) cooling the kiln product in said cooling means by transferring heat from the kiln product to said cooling air in said cooling means while simultaneously preheating said second flow of fresh raw material by transferring heat from said spent cooling air to said second flow of raw material within said cooling means; and (j) removing the kiln product from said cooling means.
Claim 29
Independent Claim
248 words
A method of burning pulverous or granular raw material in a kiln plant having a preheating unit for preheating the raw material, a rotary kiln for burning the preheated material, and means for cooling the kiln product by cooling air directed through the cooling means, comprising: (a) directing a first flow of fresh raw material to said preheating unit, said preheating unit being in the form of a multistage cyclone preheating unit; (b) successively directing the preheated raw material to each stage of said preheating unit; (c) preheating the first flow of fresh raw material in said preheating unit; (d) discharging a second flow of fresh raw material into said cooling means proper to contact heated cooling air therein and thereby preheat said second flow of fresh raw material by heat transferred from the spent cooling air thereto; (e) combining at least a portion of said first and second preheated raw material flows; (f) directing the combined preheated raw material flows to said rotary kiln; (g) burning said raw material in said rotary kiln; (h) directing the burned kiln product directly to said cooling means; (i) cooling the kiln product in said cooling means by transferring heat from the kiln product to said cooling air in said cooling means while simultaneously preheating said second flow of fresh raw material by transferring heat from said spent cooling air to said second flow of raw material within said cooling means; and (j) removing the kiln product from said cooling means.
Claim 30
Independent Claim
244 words
A method of burning pulverous or granular raw material in a kiln plant having a multistage preheating unit for preheating at least a portion of the raw material, a rotary kiln for burning the preheated material, and means for cooling the kiln product by cooling air directed through the cooling means, comprising: (a) directing a first flow of fresh raw material to said preheating unit; (b) successively directing the preheated raw material to each stage of said preheating unit; (c) preheating the first flow of raw material in said preheating unit; (d) discharging a second flow of fresh raw material into said cooling means proper so as to contact the burned kiln product therein and thereby preheat said raw material by heat transferred from the burnt kiln product in said cooling process of the cooling means; (e) combining at least a portion of said first and second preheated raw material flows; (f) directing the combined preheated raw material flows to said rotary kiln; (g) burning said raw material in said rotary kiln. (h) directing the burned kiln product directly to said cooling means; (i) cooling the kiln product in said cooling means by transferring at least a portion of the heat from the kiln product to said second flow of raw material in said cooling means while simultaneously preheating said second flow of fresh raw material by the transferred heat in said cooling means; and (j) removing the kiln product from said cooling means.
Claim 31
Independent Claim
244 words
A method of burning pulverous or granular raw material in a kiln plant having a multistage preheating unit for preheating at least a portion of the raw material, a rotary kiln for burning the preheated material, and means for cooling the kiln product by cooling air directed through the cooling means, comprising: (a) directing a first flow of fresh raw material to said preheating unit; (b) successively directing the preheated raw material to each stage of said preheating unit; (c) preheating the first flow of raw material in said preheating unit; (d) discharging a second flow of fresh raw material into said cooling means proper so as to contact the burned kiln product therein and thereby preheat said raw material by heat transferred from the burnt kiln product in said cooling process of the cooling means; (e) combining at least a portion of said first and second preheated raw material flows; (f) directing the combined preheated raw material flows to said rotary kiln; (g) burning said raw material in said rotary kiln. (h) directing the burned kiln product directly to said cooling means; (i) cooling the kiln product in said cooling means by transferring at least a portion of the heat from the kiln product to said second flow of raw material in said cooling means while simultaneously preheating said second flow of fresh raw material by the transferred heat in said cooling means; and (j) removing the kiln product from said cooling means.
Claim 32
Dependent Claim
140 words
A kiln plant which comprises a kiln for heat-treating preheated raw material, cooling means coupled to said kiln for cooling the kiln product by means of atmospheric air, at least one raw material preheating means coupled to said kiln for preheat-treating at least a first continuous supply of fresh raw material thereto, means for directing at least a second continuous supply of fresh raw material directly into and through said cooling means so as to contact at least one of heated cooling air and burned kiln product therein to at least preheat the material, means for directing spent cooling air with said second supply of raw material suspended therein to flow to said preheating means in a manner to enable at least a substantial portion of said second supply of material to be united with said first supply of material.
Claim 33
Dependent Claim
140 words
A kiln plant which comprises a kiln for heat-treating preheated raw material, cooling means coupled to said kiln for cooling the kiln product by means of atmospheric air, at least one raw material preheating means coupled to said kiln for preheat-treating at least a first continuous supply of fresh raw material thereto, means for directing at least a second continuous supply of fresh raw material directly into and through said cooling means so as to contact at least one of heated cooling air and burned kiln product therein to at least preheat the material, means for directing spent cooling air with said second supply of raw material suspended therein to flow to said preheating means in a manner to enable at least a substantial portion of said second supply of material to be united with said first supply of material.
Claim 34
Dependent Claim
27 words
The kiln plant according to claim 27 wherein at least a substantial portion of the burning of said preheated raw material takes place in said kiln proper.
Claim 35
Dependent Claim
59 words
The plant according to claim 28 wherein said means for directing the spent cooling air to flow to said preheating means comprises a pipe connected to the lower portion of said preheating means in a manner to enable said first and second flow of material to be united prior to directing the combined flows of material into said kiln.
Claim 36
Dependent Claim
21 words
The kiln plant according to claim 27 further comprising calcining means coupled to the lower end portion of said preheating means.
Claim 37
Dependent Claim
59 words
The kiln plant according to claim 30 wherein said means for directing the spent cooling air to flow to said preheating means comprises a pipe connected to said calcining means and capable of directing said first and second flows of material jointly to be calcined at least partially in said calcining means prior to being directed to said kiln.
Claim 38
Dependent Claim
39 words
The kiln plant according to claim 27 wherein said cooling means further comprises means for suspending the fresh second flow of raw material in atmospheric air and for directing said material into said cooling means while in suspension therein.
Claim 39
Dependent Claim
39 words
The kiln plant according to claim 29 wherein said cooling means further comprises means for suspending the fresh second flow of raw material in atmospheric air and for directing said material into said cooling means while in suspension therein.
Claim 40
Dependent Claim
39 words
The kiln plant according to claim 31 wherein said cooling means further comprises means for suspending the fresh second flow of raw material in atmospheric air and for directing said material into said cooling means while in suspension therein.
Claim 41
Dependent Claim
56 words
The kiln plant according to claim 27 further comprising means for mixing the second flow of material with the kiln product, and means for separating the material from the kiln product by suspending the material in the cooling air of the cooling means after treatment of the combined kiln product and material in said cooling means.
Claim 42
Dependent Claim
56 words
The kiln plant according to claim 29 further comprising means for mixing the second flow of material with the kiln product, and means for separating the material from the kiln product by suspending the material in the cooling air of the cooling means after treatment of the combined kiln product and material in said cooling means.
Claim 43
Dependent Claim
56 words
The kiln plant according to claim 31 further comprising means for mixing the second flow of material with the kiln product, and means for separating the material from the kiln product by suspending the material in the cooling air of the cooling means after treatment of the combined kiln product and material in said cooling means.
Claim 44
Dependent Claim
15 words
The kiln plant according to claim 27 wherein said cooling means is a grate cooler.
Claim 45
Dependent Claim
15 words
The kiln plant according to claim 29 wherein said cooling means is a grate cooler.
Claim 46
Dependent Claim
15 words
The kiln plant according to claim 31 wherein said cooling means is a grate cooler.
Claim 47
Dependent Claim
15 words
The kiln plant according to claim 35 wherein said cooling means is a grate cooler.
Claim 48
Dependent Claim
16 words
The kiln plant according to claim 27 wherein said cooling means is an underlying, rotating cooler.
Claim 49
Dependent Claim
16 words
The kiln plant according to claim 29 wherein said cooling means is an underlying, rotating cooler.
Claim 50
Dependent Claim
16 words
The kiln plant according to claim 31 wherein said cooling means is an underlying, rotating cooler.
Claim 51
Dependent Claim
16 words
The kiln plant according to claim 35 wherein said cooling means is an underlying, rotating cooler.
Claim 52
Dependent Claim
84 words
The kiln plant according to claim 42 wherein the underlying, rotating cooler further comprises planetary cooling means having cooler tubes positioned about, and adapted to rotate with, the outlet end portion of the underlying cooler, said cooler further comprising means for directing the second flow of material together with atmospheric air into each individual planetary cooler tube in a manner to proceed through the tube while substantially suspended in said atmospheric air and into said underlying cooler while substantially suspended in said atmospheric air.
Claim 53
Dependent Claim
84 words
The kiln plant according to claim 43 wherein the underlying, rotating cooler further comprises planetary cooling means having cooler tubes positioned about, and adapted to rotate with, the outlet end portion of the underlying cooler, said cooler further comprising means for directing the second flow of material together with atmospheric air into each individual planetary cooler tube in a manner to proceed through the tube while substantially suspended in said atmospheric air and into said underlying cooler while substantially suspended in said atmospheric air.
Claim 54
Dependent Claim
84 words
The kiln plant according to claim 44 wherein the underlying, rotating cooler further comprises planetary cooling means having cooler tubes positioned about, and adapted to rotate with, the outlet end portion of the underlying cooler, said cooler further comprising means for directing the second flow of material together with atmospheric air into each individual planetary cooler tube in a manner to proceed through the tube while substantially suspended in said atmospheric air and into said underlying cooler while substantially suspended in said atmospheric air.
Claim 55
Dependent Claim
84 words
The kiln plant according to claim 45 wherein the underlying, rotating cooler further comprises planetary cooling means having cooler tubes positioned about, and adapted to rotate with, the outlet end portion of the underlying cooler, said cooler further comprising means for directing the second flow of material together with atmospheric air into each individual planetary cooler tube in a manner to proceed through the tube while substantially suspended in said atmospheric air and into said underlying cooler while substantially suspended in said atmospheric air.
Claim 56
Dependent Claim
85 words
The kiln plant according to claim 42 wherein said underlying rotating cooler further comprises planetary cooling means having a plurality of cooler tubes positioned about, and adapted to rotate with, at least the outlet end portion of the underlying cooler, said cooler further comprising means for mixing the second flow of material with the kiln product in the individual cooler tubes, and means for separating material from the kiln product for suspension in the cooling air prior to being introduced to the underlying rotating cooler.
Claim 57
Dependent Claim
206 words
A rotary kiln plant for burning pulverous or granular raw material which comprises a rotary kiln for sintering preheated raw material such as cement raw meal, cooling means connected to the material outlet end portion of the rotary kiln for cooling the sintered kiln product by means of atmospheric air, multistage cyclone preheating means coupled to the material inlet end portion of the rotary kiln for preheating and at least partially calcining at least a first continuous supply of raw material directed thereto, means for directing at least a second continuous supply of raw material into and through said cooling means while suspended in atmospheric air so as to be preheated by heat from the hot kiln product while simultaneously providing cooling means for the hot kiln product, means for directing the spent cooling air with said second supply of raw material suspended therein to flow to said preheating means in a manner to enable at least a substantial portion of said second supply of material to be combined with said first supply of material prior to being directed to the rotary kiln for burning therein, and means for directing the combined first and second flows of preheated material to said rotary kiln for sintering therein.
Claim 58
Dependent Claim
206 words
A rotary kiln plant for burning pulverous or granular raw material which comprises a rotary kiln for sintering preheated raw material such as cement raw meal, cooling means connected to the material outlet end portion of the rotary kiln for cooling the sintered kiln product by means of atmospheric air, multistage cyclone preheating means coupled to the material inlet end portion of the rotary kiln for preheating and at least partially calcining at least a first continuous supply of raw material directed thereto, means for directing at least a second continuous supply of raw material into and through said cooling means while suspended in atmospheric air so as to be preheated by heat from the hot kiln product while simultaneously providing cooling means for the hot kiln product, means for directing the spent cooling air with said second supply of raw material suspended therein to flow to said preheating means in a manner to enable at least a substantial portion of said second supply of material to be combined with said first supply of material prior to being directed to the rotary kiln for burning therein, and means for directing the combined first and second flows of preheated material to said rotary kiln for sintering therein.
Claim 59
Dependent Claim
48 words
The rotary kiln plant according to claim 51 wherein the penultimate state of said cyclone preheater unit comprises a calcination chamber for at least partially calcining the first and second flows of preheated material prior to directing said combined flows of material to said rotary kiln for sintering.
Claim 60
Dependent Claim
38 words
The rotary kiln plant according to claim 52 further comprising means for directing a supply of preheated atmospheric air to the product outlet end portion of said rotary kiln in a manner to support combustion in the kiln.
Claim 61
Dependent Claim
34 words
The rotary kiln plant according to claim 53 wherein said supply of preheated atmospheric air is preheated by a heat exchanger having means for directing hot kiln gases therethrough for preheating the atmospheric air.
Claim 62
Dependent Claim
42 words
The rotary kiln plant according to claim 54 further comprising means for directing raw material to the material outlet end portion of said cooling means while suspended in atmospheric air in a direction countercurrent to the flow of the hot kiln product.
Claim 63
Dependent Claim
16 words
The rotary kiln plant according to claim 55 wherein said cooling means is a grate cooler.
Claim 64
Dependent Claim
17 words
The rotary kiln plant according to claim 55 wherein said cooling means is an underlying rotary cooler.
Claim 65
Dependent Claim
69 words
The rotary kiln plant according to claim 55 wherein said cooling means is an underlying cooler of the planetary type having a plurality of planetary cooler tubes connected to the material outlet end portion to rotate therewith for cooling the hot kiln product therein, with means being provided to collect and combine the hot kiln product from said planetary cooler tubes and to direct it away from the plant.
Claim 66
Dependent Claim
58 words
The kiln plant according to claim 27 wherein said means to direct fresh raw material directly into and through said cooling means is so arranged as to cause said raw material to contact at least one of heated cooling air and burned kiln product therein to preheat and at least partially calcine the material in said cooling means.
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |