US4932336A
Expired / Lapsed
US
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Method of and apparatus for disposing of wastes from wastepaper recycling
Assignee: Oschatz GmbH
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Filing: 1989-09-27
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Granted: 1990-06-12
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Expires: 2009-09-27
Abstract
Abstract To dispose of a dewatered collected product consisting predominantly of cellulosic materials in a solids phase and a residue consisting predominantly of plastics in wastepaper recycling, the collected product is dried to at most 25% weight percent moisture content as based upon the solids and is then layered onto an oscillating grate. The residue is applied as a second layer on the first layer and the resulting two-layer bed is burned on the grate with bottom-blowing with slag formation and collection. The heat content of the combustion gas can in part be recovered by the generation of steam.
Inventors
- 👤 Norbert Srowig
- 👤 Gerhard Golkowski
- 👤 Wilhelm Lutterbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:26
CPC Classifications
F; F23; F23G; F23G7/00; F23G5/00; F23G5/006; F23G5/02; F23G5/04; F23G5/44; F23G5/46; F23G2203/00; F23G2203/107; F23G2209/00; F23G2209/22; F23G2209/28; Y; Y02; Y02E; Y02E20/00; Y02E20/12
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
157 words
A method of disposing of wastes from wastepaper recycling in the paper and cardboard industry, comprising the steps of: (a) separately recovering from a wastepaper recycling process a wet dewatered collected product of solids consisting predominantly of cellulosic material and a residue consisting predominantly of plastic pieces separated from waste paper prior to recycling treatment; (b) drying said collected product to a residual water content of at most 25% by weight of the collected product; (c) continuously layering the collected product dried in step (b) to form a continuously advancing layer thereof; (d) depositing upon said layer of the collected product dried in step (b), a layer of said residue to form a continuously advancing two-layer bed; and (e) burning said continuously advancing two-layer bed while subjecting same to bottom blowing with an air-containing gas to substantially destroy said collected product and said residue while recovering a slag from the resulting combustion and producing a combustion gas.
Claim 2
Independent Claim
157 words
A method of disposing of wastes from wastepaper recycling in the paper and cardboard industry, comprising the steps of: (a) separately recovering from a wastepaper recycling process a wet dewatered collected product of solids consisting predominantly of cellulosic material and a residue consisting predominantly of plastic pieces separated from waste paper prior to recycling treatment; (b) drying said collected product to a residual water content of at most 25% by weight of the collected product; (c) continuously layering the collected product dried in step (b) to form a continuously advancing layer thereof; (d) depositing upon said layer of the collected product dried in step (b), a layer of said residue to form a continuously advancing two-layer bed; and (e) burning said continuously advancing two-layer bed while subjecting same to bottom blowing with an air-containing gas to substantially destroy said collected product and said residue while recovering a slag from the resulting combustion and producing a combustion gas.
Claim 3
Dependent Claim
24 words
The method defined in claim 1, further comprising the step of recovering heat from said combustion gas and producing steam with the recovered heat.
Claim 4
Dependent Claim
32 words
The method defined in claim 2 wherein said dewatered collected product is dried in step (b) to a residual water content of 20% by weight with respect to the solids content thereof.
Claim 5
Dependent Claim
20 words
The method defined in claim 3 wherein said dewatered collected product is dried at least in part by said steam.
Claim 6
Dependent Claim
21 words
The method defined in claim 3 wherein said dewatered collected product is dried at least in part by said combustion gas.
Claim 7
Dependent Claim
32 words
The method defined in claim 5 wherein a waste air is produced in drying said collected product, said method further comprising the step of afterburning said combustion gas with said waste air.
Claim 8
Dependent Claim
49 words
The method defined in claim 1 wherein said residue is deposited on said layer of the collected product dried in step (b) in an amount which at a maximum is 100% by weight of the collected product and 15% by weight of the solids content of the collected product.
Claim 9
Dependent Claim
30 words
The method defined in claim 1 wherein a fly ash is produced in the combustion in step (e), further comprising the step of trapping said fly ash in said slag.
Claim 10
Dependent Claim
18 words
The method defined in claim 1, further comprising the step of recovering said slag as a building material.
Claim 11
Dependent Claim
22 words
The method defined in claim 1 wherein the two-layer bed is bottom blown with an exhaust gas from an electricity-generating gas turbine.
Claim 12
Dependent Claim
23 words
The method defined in claim 10, further comprising the step of driving said turbine by combustion of a natural gas and air mixture.
Claim 13
Dependent Claim
35 words
The method defined in claim 10, further comprising the step of burning off combustibles in said combustion gas with a portion of said exhaust gas not used to bottom blow the combustion of said bed.
Claim 14
Dependent Claim
49 words
The method defined in claim 10, further comprising the step of burning off combustibles in said combustion gas, a portion of said exhaust gas not used to bottom blow the combustion of said bed being introduced as secondary air to the burning off of combustibles in said combustion gas.
Claim 15
Independent Claim
152 words
An apparatus for disposing of wastes from wastepaper recycling in the paper and cardboard industry, comprising: means for separately recovering from a wastepaper recycling process a wet dewatered collected product of solids consisting predominantly of cellulosic material and a residue consisting predominantly of plastic pieces separated from waste paper prior to recycling treatment; means for drying said collected product to a residual water content of at most 25% by weight of the collected product; means for continuously layering the dried collected product to form a continuously advancing layer thereof; means for depositing upon said layer of the collected product, a layer of said residue to form a continuously advancing two-layer bed; and means for burning said continuously advancing two-layer bed while subjecting same to bottom blowing with an air-containing gas to substantially destroy said collected product and said residue while recovering a slag from the resulting combustion and producing a combustion gas.
Claim 16
Independent Claim
152 words
An apparatus for disposing of wastes from wastepaper recycling in the paper and cardboard industry, comprising: means for separately recovering from a wastepaper recycling process a wet dewatered collected product of solids consisting predominantly of cellulosic material and a residue consisting predominantly of plastic pieces separated from waste paper prior to recycling treatment; means for drying said collected product to a residual water content of at most 25% by weight of the collected product; means for continuously layering the dried collected product to form a continuously advancing layer thereof; means for depositing upon said layer of the collected product, a layer of said residue to form a continuously advancing two-layer bed; and means for burning said continuously advancing two-layer bed while subjecting same to bottom blowing with an air-containing gas to substantially destroy said collected product and said residue while recovering a slag from the resulting combustion and producing a combustion gas.
Claim 17
Dependent Claim
125 words
The apparatus defined in claim 14 wherein said means for burning said continuously advancing two-layer bed comprises a combustion furnace formed with an oscillating grate inclined downwardly in a direction of advance of said bed, said means for drying said collected product includes a drier upstream of said grate, said means for continuously layering the dried collected product includes a transport device for the dried collected product connected to said drier and a metering device connected to said transport device for depositing the dried collected product on said grate, said means for depositing said residue includes another metering device located downstream of the first-mentioned metering device and depositing said residue upon the grate, and said apparatus further comprises a slag collector disposed below said grate.
Claim 18
Dependent Claim
27 words
The apparatus defined in claim 15, further comprising a steam generator connected downstream of said furnace and generating steam from heat of combustion gas from said furnace.
Claim 19
Dependent Claim
19 words
The apparatus defined in claim 16 wherein said steam generator is connected with said drier for supplying steam thereto.
Claim 20
Dependent Claim
32 words
The apparatus defined in claim 15, further comprising a hot-gas duct connected to said furnace downstream of said grate in a combustion gas flow path for delivering combustion gas to said drier.
Claim 21
Dependent Claim
39 words
The apparatus defined in claim 15, further comprising an afterburner chamber formed in said furnace, and means connecting an outlet of said drier with said afterburner for afterburning combustion gas in said chamber with waste air from said drier.
Claim 22
Dependent Claim
20 words
The apparatus defined in claim 15, further comprising means for collecting fly ash from combustion gas formed in said furnace.
Claim 23
Dependent Claim
36 words
The apparatus defined in claim 20 wherein said means for collecting fly ash from the combustion gas opens into said furnace in a slag-forming region of said grate to trap said fly ash in said slag.
Claim 24
Dependent Claim
43 words
The apparatus defined in claim 15, further comprising a an electricity-generating gas turbine for generating gas flow through said grate, and a waste gas duct for supplying a bottom-blowing plenum of said furnace below said grate with waste gas from said gas turbine.
Claim 25
Dependent Claim
45 words
The apparatus defined in claim 22 wherein said duct has a branch delivering a portion of said waste gas to an afterburner for said combustion gas, further comprising a control element regulating the proportions of said waste gas sent to said plenum and said afterburner.
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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |