# US 5,862,762 A · Method and facility for refuse incineration using a fire-grate-type incinerator and with separation of non-combustibles

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- Number: US 5,862,762 A
- Document ID: US5862762A
- Status: Granted
- Kind: A
- Application number: 08/776,072
- Filed: 1997-01-08
- Granted: 1999-01-26
- Earliest claimed: 1995-05-17
- Assignees: Hitachi Zosen Corporation
- Inventors: Yoshitoshi Sekiguchi; Kunio Sasaki; Hideo Shimotani; Noboru Okigami; Hiroshi Isotani; Kenji Kaketa; Kenji Kashiwabara; Shozo Umemura; Hiroshi Onishi
- Web page: https://patentgrep.com/patent/US5862762A

## CPC

- B03B 9/06: specially adapted for refuse
- F23G 5/006: {General arrangement of incineration plant, e.g. flow sheets}
- F23G 5/02: with pretreatment
- F23G 5/165: {arranged at a different level}
- F23G 5/46: Recuperation of heat
- F23G 2201/10: Drying by heat
- F23G 2201/602: different sizes
- F23G 2201/603: recyclable material
- F23G 2201/80: Shredding
- F23G 2202/10: in two or more stages
- F23G 2202/102: with supplementary heating
- F23G 2202/104: with ash melting stage
- F23G 2202/105: with waste supply in stages
- F23G 2203/101: with stepped or inclined grate
- F23G 2206/00: Waste heat recuperation
- F23G 2206/10: reintroducing the heat in the same process, e.g. for predrying
- F23G 2206/203: with a power/heat generating installation
- F23G 2207/101: for temperature
- F23G 2207/50: Cooling fluid supply
- F23G 2209/28: Plastics or rubber like materials
- F23G 2900/00001: Exhaust gas recirculation
- F23G 2900/50008: Combustion of waste suspended or lifted by upward gas flows
- F23G 2900/50214: Separating non combustible matters
- F23L 2900/07005: Injecting pure oxygen or oxygen enriched air
- F23L 2900/07007: using specific ranges of oxygen percentage
- Y02E 20/12: Heat utilisation in combustion or incineration of waste
- Y02E 20/34: Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
- Y02W 30/52: Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
- Y02W 30/62: Plastics recycling; Rubber recycling
- B03B: SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23L: SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ({air-supply arrangements for fluent fuels F23C;} firebridges with means for feeding air or steam F23M3/04; baffles or shields with air supply passages F23M9/04); VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS {(dampers and throat restrictors for open fire-places F24; air inlet valves for open fire fronts F24)}; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

Combustible is comminuted and dried, and metal and noncombustible are removed from the coarsely comminuted combustible. Then, the combustible is secondarily comminuted and separated into coarse combustible and fluff which is fine combustible. The coarse combustible of the separated combustible is fed onto a fire grate (2) of a refuse incinerator (1), and burned in flat bed combustion in a primary combustion chamber (4). On the other hand, the fluff is burned in suspended combustion in a secondary combustion chamber (7) with a combustion fluff burner (5) for incinerating combustible. Thus, refuse containing much plastics which is formed into fluff can be efficiently disposed of, whereby the amount of incineration is increased as a whole.

## Claims

### Claim 1

A method for incinerating refuse comprising a preprocessing process for preprocessing combustible, said preprocessing process comprising a first comminuting step for primarily comminuting combustible into comminuted combustible; a first step for separating metal and a second step for separating non-combustible from the comminuted combustible to provide separated comminuted combustible; a second comminuting step for secondarily comminuting the separated comminuted combustible into secondarily comminuted combustible; and a classification step for classifying the secondarily comminuted combustible into coarse combustible and fine combustible; feeding the coarse combustible onto a fire grate of a refuse incinerator for combustion in a primary combustion chamber, supplying the fine combustible as fuel to a combustion burner for a secondary combustion chamber which is provided above the primary combustion chamber of the refuse incinerator, the reprocessed and produced fine combustible being supplied as a fuel to a fusion burner in an ash fusion furnace associated with the refuse incinerator.

### Claim 2 (depends on 1)

The method for incinerating refuse according to claim 1, wherein secondary combustion air is supplied to the secondary combustion chamber of the refuse incinerator and primary combustion air is supplied to the combustion burner, and one of the primary combustion air and secondary combustion air is oxygen-enriched air.

### Claim 3 (depends on 1)

The method for incinerating refuse according to claim 1, wherein agitation gas is blown around the secondary combustion chamber formed by the combustion burner of the refuse incinerator, and combustion exhaust gas discharged from the refuse incinerator or air is used as the agitation gas.

### Claim 4 (depends on 1)

The method for incinerating refuse according to claim 1, wherein post-combustion gas is blown downstream of the secondary combustion chamber of the refuse incinerator from a secondary combustion air nozzle, and a combination of combustion exhaust gas and air is used as the post-combustion air.

### Claim 5 (depends on 1)

The method for incinerating refuse according to claim 1, wherein reduction fuel is supplied to a reduction combustion region between the primary combustion chamber on a fire grate of the refuse incinerator and the secondary combustion chamber having a combustion burner.

### Claim 6 (depends on 1)

The method for incinerating refuse according to claim 1 wherein the fine combustible is supplied as fuel to a superheating burner of an independent superheater in an electric power generation facility also provided in the refuse incinerator.

### Claim 7 (depends on 6)

The method for incinerating refuse according to claim 6, wherein combustion air is supplied to the superheating burner of the superheater and wherein said combustion air is oxygen-enriched air.

### Claim 8 (depends on 1)

The method for incinerating refuse according to claim 1, wherein combustion air is supplied to the fusion burner in the ash fusion furnace and wherein said combustion air is oxygen-enriched air.

### Claim 9

An incineration facility comprising a preprocessing facility comprising a first comminutor for comminuting combustible into comminuted combustible, a sorter for sorting metal from the comminuted combustible, a separator for separating non-combustibles from the comminuted combustible, a secondary comminutor for secondarily comminuting the comminuted combustible after the separation from the non-combustible, and a classifier for classifying the secondarily comminuted combustible into coarse combustible and fine combustible; a refuse incinerator formed with a primary combustion chamber on a fire grate and with a secondary combustion chamber above the primary combustion chamber; a coarse combustible supply line for supplying the coarse combustible separated by said classifier to the primary combustion chamber of the refuse incinerator; and a fine combustible incineration supply line for supplying as fuel said fine combustible to a combustion burner mounted in the second combustion chamber of the refuse incinerator, an ash furnace equipped with a fusion burner for heating and melting incineration residue discharged from the refuse incinerator to thereby produce slag, and a fine combustible fusion supply line for supplying coarse combustible separated by the classification process as fuel to the fusion burner.

### Claim 10 (depends on 9)

The incineration facility according to claim 9 further comprising an electric power generation facility having an independent superheater for heating steam obtained from a boiler of the refuse incinerator, and generating electric power by driving a turbine, and a fine combustible superheating supply line for supplying coarse combustible separated by the classifier as fuel to a superheating burner of the independent superheater.

### Claim 11 (depends on 9)

The incineration facility according to claim 9 further comprising, downstream of the secondary combustion chamber of the refuse incinerator, a secondary combustion air nozzle for blowing post-combustion gas, said secondary combustion air nozzle comprising an air supply tube disposed at the center of the shaft of the secondary combustion air nozzle for blowing air into the secondary combustion chamber, and a cooling gas supply tube fitted over said air supply tube for blowing the part of the exhaust gas drawn from the exhaust gas outlet of the refuse incinerator back into the secondary combustion chamber.

### Claim 12 (depends on 9)

The incineration facility according to claim 9 further comprising a reduction fuel nozzle disposed between the primary combustion chamber and the secondary combustion chamber of the refuse incinerator, and a reduction combustion region between the primary and secondary combustion chambers.