Patent US3864075A successfully refreshed from Google Patents.
US3864075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for burning granular or pulverous material
Assignee: FLSmidth and Co AS
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Filing: 1974-04-29
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Granted: 1975-02-04
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Expires: 1994-04-29
Abstract
Abstract A plant is disclosed for burning granular or pulverous material, particularly in the form of cement raw materials to be burnt to cement clinker. A preheater comprises at least two cooperating units, each with its own heating gas or air inlet and outlet and raw material inlet. A kiln to which preheated raw material is fed from the preheater has associated cooling means for cooling material burnt in the kiln. Heated cooling air leaving the cooling means is divided such that a part is led as combustion air to the kiln and a part is led to the air inlet of one preheater unit, the gas inlet of the other preheater unit being connected to an exhaust gas outlet from the kiln, and each unit each having at or near its gas or air outlet, its own means for controlling the air or gas flow through that unit and hence the division of the heated cooling air.
Inventors
- 👤 Soren Bent Christiansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:11
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/2016; F27B7/2041; F27B7/205; F27B7/2025
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
144 words
A plant for burning granular or pulverous material comprising a preheater having at least two cooperating units, each unit having an inlet and an outlet for heating gas or air and a raw material inlet, a kiln having means for feeding preheated raw material from said preheater, cooling means associated with said kiln for cooling material burnt therein, means for dividing said heated cooling air such that a portion is directed as combustion air to said kiln and a portion is directed to an inlet of at least one preheater unit, means for connecting the gas inlet of said other preheater unit to an exhaust gas outlet of said kiln, and means associated with each preheater unit at or near its gas or air outlet for controlling the air or gas flow through each associated unit and the division of the heated cooling air.
Claim 2
Dependent Claim
144 words
A plant for burning granular or pulverous material comprising a preheater having at least two cooperating units, each unit having an inlet and an outlet for heating gas or air and a raw material inlet, a kiln having means for feeding preheated raw material from said preheater, cooling means associated with said kiln for cooling material burnt therein, means for dividing said heated cooling air such that a portion is directed as combustion air to said kiln and a portion is directed to an inlet of at least one preheater unit, means for connecting the gas inlet of said other preheater unit to an exhaust gas outlet of said kiln, and means associated with each preheater unit at or near its gas or air outlet for controlling the air or gas flow through each associated unit and the division of the heated cooling air.
Claim 3
Dependent Claim
30 words
The plant according to claim 1 wherein at least one of the preheater units comprises means for increasing the heat content of the air or gas fed to that unit.
Claim 4
Dependent Claim
30 words
The plant according to claim 2 wherein said means for increasing the heat content comprises a burning chamber at the air or gas inlet having means for introducing fuel therein.
Claim 5
Dependent Claim
29 words
The plant according to claim 1 wherein the preheater units further comprise means for feeding their waste gas or air jointly to an electrostatic precipitator for dedusting said gases.
Claim 6
Dependent Claim
29 words
The plant according to claim 2 wherein the preheater units further comprise means for feeding their waste gas or air jointly to an electrostatic precipitator for dedusting said gases.
Claim 7
Dependent Claim
29 words
The plant according to claim 3 wherein the preheater units further comprise means for feeding their waste gas or air jointly to an electrostatic precipitator for dedusting said gases.
Claim 8
Dependent Claim
53 words
The plant according to claim 1 further comprising means to direct the waste gases from one preheater unit to another preheater unit at a point between the inlet and the outlet of the other unit, and further comprising means for controlling the gas or air flow through each unit upstream of said connection.
Claim 9
Dependent Claim
53 words
The plant according to claim 2 further comprising means to direct the waste gases from one preheater unit to another preheater unit at a point between the inlet and the outlet of the other unit, and further comprising means for controlling the gas or air flow through each unit upstream of said connection.
Claim 10
Dependent Claim
53 words
The plant according to claim 3 further comprising means to direct the waste gases from one preheater unit to another preheater unit at a point between the inlet and the outlet of the other unit, and further comprising means for controlling the gas or air flow through each unit upstream of said connection.
Claim 11
Dependent Claim
53 words
The plant according to claim 4 further comprising means to direct the waste gases from one preheater unit to another preheater unit at a point between the inlet and the outlet of the other unit, and further comprising means for controlling the gas or air flow through each unit upstream of said connection.
Claim 12
Dependent Claim
60 words
The plant according to claim 1 wherein at least one of said preheater units connected to said kiln gas outlet further comprises means for discharging preheated material into at least one of said preheater units connected to said cooling means at the inlet or at a point between the inlet and the outlet for material treated in said preheater unit.
Claim 13
Dependent Claim
60 words
The plant according to claim 2 wherein at least one of said preheater units connected to said kiln gas outlet further comprises means for discharging preheated material into at least one of said preheater units connected to said cooling means at the inlet or at a point between the inlet and the outlet for material treated in said preheater unit.
Claim 14
Dependent Claim
60 words
The plant according to claim 3 wherein at least one of said preheater units connected to said kiln gas outlet further comprises means for discharging preheated material into at least one of said preheater units connected to said cooling means at the inlet or at a point between the inlet and the outlet for material treated in said preheater unit.
Claim 15
Dependent Claim
60 words
The plant according to claim 4 wherein at least one of said preheater units connected to said kiln gas outlet further comprises means for discharging preheated material into at least one of said preheater units connected to said cooling means at the inlet or at a point between the inlet and the outlet for material treated in said preheater unit.
Claim 16
Dependent Claim
60 words
The plant according to claim 7 wherein at least one of said preheater units connected to said kiln gas outlet further comprises means for discharging preheated material into at least one of said preheater units connected to said cooling means at the inlet or at a point between the inlet and the outlet for material treated in said preheater unit.
Claim 17
Dependent Claim
29 words
The plant according to claim 1 wherein said means for controlling the air or gas flow through said preheater units comprises at least one of dampers, valves and fans.
Claim 18
Dependent Claim
29 words
The plant according to claim 11 wherein said means for controlling the air or gas flow through said preheater units comprises at least one of dampers, valves and fans.
Claim 19
Dependent Claim
28 words
The plant according to claim 1 wherein each preheating unit comprises a plurality of cyclone treating units arranged in series superimposed communicating relationship with respect to each other.
Claim 20
Dependent Claim
63 words
The plant according to claim 1 wherein said preheating units comprise a first primary preheater unit having a plurality of cyclone treating units and a secondary preheater unit having a single cyclone treating unit having a raw material inlet in a gas or air pipe which extends from the gas outlet of said kiln to the gas inlet of the cyclone treating unit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |