Patent US3858535A successfully refreshed from Google Patents.
US3858535A
Expired / Lapsed
US
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Process for incinerating slurry and apparatus therefor
Assignee: Ebara Corp
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Filing: 1973-07-12
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Granted: 1975-01-07
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Expires: 1993-07-12
Abstract
Abstract Partially dried slurry containing organic matter and ash-forming components are dried by means of the combustion heat generated in subsequent combustion of the dried slurry. The dried slurry is transferred in powder form into an incinerator wherein it is burned in suspended condition. The temperature of the incinerator is kept above the melting point of the ash formed therein. Where the melting point of the ash is high, it is lowered by the addition of salts of sodium or calcium prior to incineration. The incinerated ash in fused condition is separated from the hot combustion gases which then pass on to the dryer.
Inventors
- 👤 Kaoru Shiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:25
CPC Classifications
F; F23; F23J; F23J1/00; B; B01; B01D; B01D53/00; B01D53/26; C; C02; C02F; C02F11/00; C02F11/12; C02F11/13; F23G; F23G7/00; F23G7/001
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
115 words
A process for the incineration of slurry containing organic matter, comprising the steps of passing incoming slurry through a drying chamber, burning said dried slurry in dispersed condition to an ash in an incinerator, the temperature of combustion being controlled to be above the melting point of the ash formed during said incineration, passing the hot combustion gases and molten ash from said incinerator through a downwardly sloping common flue connected to said incinerator proximate the bottom thereof, said fluid having a lowest region, separating said ash in molten condition from the hot combustion gases at said lowest region and transferring the heat from said hot combustion gases to incoming slurry in said drying chamber.
Claim 2
Dependent Claim
115 words
A process for the incineration of slurry containing organic matter, comprising the steps of passing incoming slurry through a drying chamber, burning said dried slurry in dispersed condition to an ash in an incinerator, the temperature of combustion being controlled to be above the melting point of the ash formed during said incineration, passing the hot combustion gases and molten ash from said incinerator through a downwardly sloping common flue connected to said incinerator proximate the bottom thereof, said fluid having a lowest region, separating said ash in molten condition from the hot combustion gases at said lowest region and transferring the heat from said hot combustion gases to incoming slurry in said drying chamber.
Claim 3
Dependent Claim
35 words
The process as defined in claim 1 wherein an inorganic compound is added to said slurry prior to incineration, said compound being of such a type as to lower the melting point of said ash.
Claim 4
Dependent Claim
22 words
The process as defined in claim 2 wherein said inorganic compound is selected from the group consisting of CaO,Ca(OH)2, CaCO3 and Na2SO4.
Claim 5
Dependent Claim
21 words
The process as defined in claim 1 wherein said hot combustion products are brought into direct contact with said incoming slurry.
Claim 6
Dependent Claim
17 words
The process as defined in claim 1 wherein said drying chamber is of the indirect drying type.
Claim 7
Dependent Claim
36 words
The process as defined in claim 1 wherein the quantity of air supplied to said incinerator is controlled to keep the residual oxygen content in the combustion exhaust gas at 5 percent or less by volume.
Claim 8
Dependent Claim
19 words
The process as defined in claim 1 wherein heat is added to said incinerator by combustion of auxiliary fuel.
Claim 9
Dependent Claim
32 words
The process as defined in claim 1 wherein the heat in said flue gas is transferred to water, generating steam, and said steam is introduced into said dryer to dry said slurry.
Claim 10
Dependent Claim
32 words
The process as defined in claim 1 wherein said fused slurry in the form of small drops is brought into contact with water to form granules measuring 2 to 3mm in diameter.
Claim 11
Dependent Claim
18 words
The process as defined in claim 1 wherein said fused slurry is allowed to cool into block form.
Claim 12
Independent Claim
95 words
An apparatus for incineration of slurry containing organic matter and ash-forming components, comprising a dryer for decreasing the moisture content of said slurry, an incinerator capable of operating at temperatures above the melting point of ash formed in said incinerator, means for conveying said slurry to said incinerator, a flue at the bottom of said incinerator for downwardly-leading hot combustion exhaust gas and molten slag toward said dryer for drying incoming slurry, said flue having a lowest region and an opening at said lowest region for separating fused ash from said hot combustion exhaust gas.
Claim 13
Independent Claim
95 words
An apparatus for incineration of slurry containing organic matter and ash-forming components, comprising a dryer for decreasing the moisture content of said slurry, an incinerator capable of operating at temperatures above the melting point of ash formed in said incinerator, means for conveying said slurry to said incinerator, a flue at the bottom of said incinerator for downwardly-leading hot combustion exhaust gas and molten slag toward said dryer for drying incoming slurry, said flue having a lowest region and an opening at said lowest region for separating fused ash from said hot combustion exhaust gas.
Claim 14
Dependent Claim
36 words
The apparatus as defined in claim 11, further comprising means for adding calcium or sodium salts to said dried slurry prior to incineration in order to lower the melting point of ash formed during said incineration.
Claim 15
Dependent Claim
26 words
The apparatus as defined in claim 11 wherein the hot combustion exhaust gases from said incinerator come into direct contact with said slurry for drying same.
Claim 16
Dependent Claim
15 words
The apparatus as defined in claim 11 wherein said dryer is of the indirect type.
Claim 17
Dependent Claim
21 words
The apparatus as defined in claim 11 wherein said incinerator is provIded with a burner for the combustion of auxiliary fuel.
Claim 18
Dependent Claim
36 words
The apparatus as defined in claim 11, further comprising boiler means for transferring the heat in said hot combustion to water and conduit means for leading the steam generated in said boiler means to said dryer.
Claim 19
Dependent Claim
24 words
The apparatus as defined in claim 11, further comprising means for separating fused ash from said hot combustion exhaust gas passing through said flue.
Claim 20
Dependent Claim
40 words
The apparatus as defined in claim 17 wherein a water tank is positioned beneath said opening for separating said fused ash for reception of said separated fused ash and converting same into granules measuring 2 to 3 mm in diameter.
Claim 21
Dependent Claim
47 words
The apparatus as defined in claim 11 further comprising sampling means for determining the oxygen content of said flue gas and means for controlling the air input to said incinerator chamber so as to maintain the oxygen content in said flue gas at 5 percent or lower.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |