Ebara Corporation

Other

Ebara Environmental Plant Co., Ltd.

Norihisa Miyoshi

Takahiro Oshita

Shuichi Nagato

Tetsuhisa Hirose

Seiichiro Toyoda

Shosaku Fujinami

Kazuo Takano

Shugo Hosoda

Masaaki Irie

Katsutoshi Naruse

Yasuhiro Sawada

Tatsuya Hasegawa

Yoshio Hirayama

Nobutaka Kashima

Chikashi Tame

Koh Sasaki

Hiroshi Hashimoto

Katsuyuki Aoki

Takahiro Ohshita

Masamichi Nakashiba

Eiji Ishikawa

Yuichi Iida

Shinji Sekikawa

Tomoyuki Shinano

Akira Shimokura

Kei Matsuoka

Masayuki Horio

Hiroshi Ishibe

Masaji Kamisada

Takayoshi Kawagishi

The present invention provides a fuel gasification furnace including a gasification chamber () for fluidizing a high-temperature fluidizing medium therein to form a gasification chamber fluidized bed having an interface, and for gasifying a fuel in the gasification chamber fluidized bed, a char combustion chamber () for fluidizing a high-temperature fluidizing medium therein to form a char combustion chamber fluidized bed having an interface, and for combusting char generated by gasification in the gasification chamber () in the char combustion chamber fluidized bed to heat the fluidizing medium, and a first energy recovery device () for using gases generated by the gasification chamber () as a fuel. The gasification chamber () and the char combustion chamber () are integrated with each other. The gasification chamber () and the char combustion chamber () are divided from each other by a first partition wall () for preventing gases from flowing therebetween, and which extends vertically upward from the interfaces of the respective fluidized beds. The first partition wall () has a first opening () provided in a lower portion thereof, and the first opening () serves as a communication between the gasification chamber () and the char combustion chamber (), for allowing the fluidizing medium heated in the char combustion chamber () to move from the char combustion chamber () via the first opening () into the gasification chamber ().

Fuel gasification system

An incombustible withdrawing system withdraws an incombustible from a fluidized-bed furnace having a fluidized bed formed therein by a fluidized medium. The incombustible withdrawing system has a mixture delivery path to deliver a mixture of the fluidized medium and the incombustible from a bottom of the fluidized-bed furnace. The incombustible withdrawing system also has a fluidized-bed separating chamber disposed downstream of the mixture delivery path to fluidize the mixture by a fluidizing gas and to separate the mixture into a first separated mixture and a second separated mixture. The incombustible withdrawing system includes a return passage to return the first separated mixture to the fluidized-bed furnace, and an incombustible discharge passage to discharge the second separated mixture to an exterior of the fluidized-bed furnace.

Incombustible withdrawing system

A gasification furnace and a combustion furnace are integrated with each other to form a single fluidized-bed gasification and combustion furnace in which unburned char generated in the gasification furnace is combusted in the combustion furnace, and the thus generated heat of combustion is utilized as a heat source for gasification. The fluidized-bed gasification and combustion furnace () comprises a gasification furnace () and a combustion furnace () which are divided by a first partition wall (). In the gasification furnace (), a revolving flow of the fluidized medium is formed by diffusion devices () provided on furnace bottoms, and an upward flow of the fluidized medium partly flows in the combustion furnace (). The combustion furnace () is divided into a main partition wall (). In the main combustion chamber (), a revolving flow of the fluidized medium is formed by diffusion devices () provided on furnace bottoms, and an upward flow of the fluidized medium partly flows in the heat recovery chamber ().

Fluidized-bed gasification and combustion furnace

A supplying apparatus supplies a combustible material capable of enhancing the sealing effects of a supplying system for supplying a combustible material, such as combustible wastes, to a fluidized-bed chamber, stably supplies a combustible material having an undefined shape, and reduces cost for installation. A facility is also provided for gasifying a combustible material using the supplying apparatus for supplying a combustible material, and a method of gasifying combustible materials is also provided. The supplying apparatus supplies a combustible material onto the fluidized bed of a fluidized-bed gasifier chamber or a fluidized-bed combustion chamber. A screw conveyor is inclined, with transportation of the combustible material directed upward, at an angle of 20 degrees or more and 80 degrees or less with respect to a horizontal plane, causing a bed material to flow into a conveyor casing of the screw conveyor.

Supplying apparatus for supplying combustible material, a gasification apparatus for gasifying combustible material and method for gasifying combustible material

Combustibles such as wastes are gasified in a fluidized bed. A fluidized-bed furnace has a heat recovery region in addition to a combustion region. The temperature of a fluidized bed or the temperature of a freeboard is controlled so as to be kept at a predetermined value by adjusting the heat recovery rate in the heat recovery region.

Method and apparatus for gasifying fluidized bed

A combustion method and apparatus in which combustible matter, e.g., waste matter, coal, etc., is gasified to produce a combustible gas containing a sufficiently large amount of combustible component to melt the ash by its own heat. A fluidized-bed furnace ( ) has an approximately circular horizontal cross-sectional configuration. A moving bed ( ), in which a fluidized medium settles and diffuses, is formed in the central portion of the furnace, and a fluidized bed ( ), in which the fluidized medium is actively fluidized, is formed in the peripheral portion in the furnace. The fluidized medium is turned over to the upper part of the moving bed ( ) from the upper part of the fluidized bed ( ), thus circulating through the two beds. Combustible matter ( ) is cast into the upper part of the moving bed ( ) and gasified to form a combustible gas while circulating, together with the fluidized medium. The amount of oxygen supplied to the fluidized-bed furnace ( ) is set so as to be the same contained in an amount of air not higher than 30% of the theoretical amount of combustion air. The temperature of the fluidized bed ( ) is maintained at 450&deg; C. to 650&deg; C. so that the combustible gas produced contains a large amount of combustible component. The combustible gas and fine particles produced in the fluidized-bed furnace ( ) are supplied to a melt combustion furnace where they are burned at high temperature, and the resulting ash is melted.

Method of and apparatus for fluidized-bed gasification and melt combustion

In an improved system for recovering heat from a combustion gas produced by burning wastes, the combustion gas or combustible gas produced by partial burning of the wastes subjected to dust filtration in a temperature range of 450-650&deg; C. at a filtration velocity of 1-5 cm/sec under a pressure of from &minus;5 kPa (gage) to 5 MPa before heat recovery is effected. The dust filtration is preferably performed using a filter medium which may or may not support a denitration catalyst. Heat recovery is preferably effected using a steam superheater. The dust-free gas may partly or wholly be reburnt with or without an auxiliary fuel to a sufficiently high temperature to permit heat recovery. The combustion furnace may be a gasifying furnace which, in turn, may be combined with a melting furnace. If desired, the reburning to a higher temperature may be performed under pressure and the obtained hot combustion gas is supplied to a gas turbine to generate electricity, followed by introduction of the exhaust gas from the gas turbine into a steam superheater for further heat recovery. The system can raise the temperature of superheated steam to a sufficient level to enhance the efficiency of power generation without possibility of corrosion of heat transfer pipes by the combustion gas or combustible gas.

Heat recovery system and power generation system

A pressurized internal circulating fluidized-bed boiler is incorporated in a combined-cycle electric generating system in which a fuel such as coal, petro coke or the like is combusted in a pressurized fluidized bed and an exhaust gas produced by the combusted fuel is introduced into a gas turbine. The pressurized internal circulating fluidized-bed boiler includes a pressure vessel, a combustor disposed in the pressure vessel and a main fluidized bed combustion chamber provided with an air diffusion device. A thermal energy recovery chamber is partitioned from the main combustion chamber by an inclined partition wall. A fluidized medium flows into and out of the main combustion chamber and the thermal energy recovery chamber. A free board is provided integrally above the main combustion chamber and the thermal energy recovery chamber so that combustion gas from the main combustion chamber and the thermal energy recovery chamber is mixed in the free board.

Pressurized internal circulating fluidized-bed boiler

Growing community of inventors

Tokyo, Japan

Norihisa Miyoshi