Waste processing system and fuel reformer used in the waste processing system

• US 6,688,106 B2
• Filed: 02/13/2001
• Issued: 02/10/2004
• Est. Priority Date: 10/28/1997
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sunou, Megumi, Ajiro, Taiko, Ishigaki, Yukio, Hatamiya, Shigeo, Yamagishi, Masahiko, Okusawa, Tsutomu, Tokunaga, Kenji, Koyama, Kazuhito
• Primary Examiner(s): NGUYEN, HOANG M
• Application Number:
  US09/781,438
• Publication Number:
  US 20010032468A1
• Time in Patent Office: 1,092 Days
• Field of Search: 606/50, 606/53, 606/70, 606/76, 110/233, 110/342, 110/344, 110/346
• US Class Current: 60/653
• CPC Class Codes: B01B 1/005 Evaporation for physical or chemical purposes; Evaporation apparatus therefor, e.g. evaporation of liquids for gas phase reactions
• CPC Class Codes: C01B 3/38 using catalysts
• CPC Class Codes: F01K 3/247 one heater being an incinerator
• CPC Class Codes: F02G 2254/11 Catalytic burners
• CPC Class Codes: F23G 2202/106 with recirculation of unburned solid or gaseous matter into combustion chamber
• CPC Class Codes: F23G 2206/10 reintroducing the heat in the same process, e.g. for predrying
• CPC Class Codes: F23G 5/0276 using direct heating
• CPC Class Codes: F23G 5/46 Recuperation of heat
• CPC Class Codes: F23J 15/08 of heaters
• CPC Class Codes: Y02E 20/12 Heat utilisation in combustion or incineration of waste

Abstract

A waste-to-energy incineration system, in which the amount and heat value of exhaust gas largely changes in long and short periods, comprises an incinerator for burning waste, a boiler in the incinerator for generating steam with exhaust heat generated by the incinerator, a superheater for superheating steam generated in the boiler, a steam turbine driven by steam superheated by the superheater, a generator driven by the steam turbine, a fuel reformer for reforming source fuel, and a combustor burning fuel gas reformed by the fuel reformer and at least a part of exhaust gas led from the incinerator which is able to stably decompose generated dioxin in waste incineration exhaust gas.

Claims

1. A waste incinerating processing system, comprising:

an incinerator for burning waste;

means for providing air into said incinerator whereby the burning of waste takes place in the presence of air;

a dust collector for collecting and removing dust from exhaust gas exhausted from said incinerator; and

a combustor for burning exhaust gas from said dust collector from which the dust has been removed; and

wherein

said dust collector is provided in a path in which said exhaust gas from said incinerator is led to said combustor.

2. A waste incinerating processing system according to claim 1, wherein

said combustor includes an exhaust gas distributing chamber for introducing said exhaust gas from said dust collector.

4. A waste incinerating processing system according to claim 1, wherein said combustor is a dioxin-decomposing combustor for thermally decomposing dioxin contained in said exhaust gas.

5. A waste incinerating processing system, according to claim 1, wherein said combustor is a combustor which combusts the exhaust gas at a high temperature for a predetermined time sufficient to decompose dioxin in the exhaust gas.

3. A method of processing exhaust gas generated in an incinerator for burning waste in the presence of air, comprising the steps of:

passing said exhaust gas from said incinerator to a dust collector;

collecting and removing dust from said exhaust gas exhausted from said incinerator in said dust collector;

passing said exhaust gas from which the dust has been removed to a combustor; and

re-burning said exhaust gas from which the dust has been removed, in said combustor.