Ebara Corporation

Ube Industries, Inc.

Other

Kazuo Takano

Tetsuhisa Hirose

Takahiro Oshita

Shosaku Fujinami

Masaaki Irie

Norihisa Miyoshi

Shuichi Nagato

Yoshio Hirayama

Hiroyuki Fujimura

Toshio Fukuda

Seiichiro Toyoda

Shugo Hosoda

Chikashi Tame

Takahiro Ohshita

Kazuaki Watanabe

Akira Uchino

Chikao Goke

Nobuya Azuma

An ash melting system of the present invention includes a slagging combustion furnace () for melting ash into molten slag; and a slag separating apparatus () for bringing the molten slag () discharged from the slagging combustion furnace into contact with slag cooling water () to produce water-quenched slag (), and separating the water-quenched slag from the slag cooling water. The ash melting system further includes a gas blowing means for blowing air or inert gas () between a slag discharge port () of the slagging combustion furnace and the surface of the slag cooling water.

Ash fusing system, method of operating the system, and gasification fusing system for waste

An apparatus for treating wastes includes a fluidized bed reactor for partially combusting the wastes at a relatively low temperature, and a separate relatively high temperature reactor for separate gasification of gaseous material and char from the first gasification. This synthesis gas thus formed is cooled, subjected to a conversion operation in a converter to produce hydrogen.

Apparatus for treating wastes by gasification

A method and apparatus for treating wastes by gasification recovers useful resources including energy, valuables such as metals, and gases for use as synthesis gas for chemical industries or fuel. The wastes are gasified in a fluidized-bed reactor at a relatively low temperature. Gaseous material and char produced in the fluidized-bed reactor are introduced into a high-temperature combustor, and low calorific gas or medium calorific gas is produced in the high-temperature combustor at a relatively high temperature. The fluidized-bed reactor preferably is a revolving flow-type fluidized-bed reactor. The high-temperature combustor preferably is a swirling-type high-temperature combustor.

Method and apparatus for treating wastes by gasification

The present invention relates to a waste carbonization method which produces charcoal and/or activated carbon from solid wastes, such as wood waste, and renders produced gas completely harmless. Solid wastes B are exposed to gas generated in pyrolysis gasification of other wastes A in a gasification furnace 1 to produce charcoal and/or activated carbon from the solid wastes B.

Method for carbonizing wastes

A method and apparatus for treating wastes by two-stage gasification recovers metals or ash content in the wastes in such a state that they can be recycled, and gases containing carbon monoxide (CO) and hydrogen gas (H ) for use as synthesis gas for ammonia (NH ) or production of hydrogen gas. The wastes are gasified in a fluidized-bed reactor at a low temperature. Then, gaseous material and char produced in the fluidized-bed reactor are introduced into a high-temperature combustor, and gasified at a high temperature and ash content is converted into molten slag. After water scrubbing and a CO conversion reaction, the gas is separated into H and residual gas. The residual gas is then supplied to the fluidized-bed reactor as a fluidizing gas.

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

The present invention relates to a method for treating solid wastes such as refuse-derived fuel or biomass wastes by pyrolysis gasification in a fluidized-bed gasification furnace,and then high-temperature combustion in a melting furnace,A primary combustion in a fluidized-bed,of the gasification furnace is carried out at a temperature of 600&plusmn;50&deg; C., a secondary combustion in a freeboard,of the gasification furnace is carried out at a temperature of 725&plusmn;75&deg; C., and a tertiary combustion in the melting furnace,is carried out at a temperature higher than a fusion temperature of ashes by 50 to 100&deg; C. An oxygen ratio (a ratio of an amount of oxygen supplied for combustion to a theoretical amount of oxygen for combustion) in the primary combustion is in the range of 0.1 to 0.3, an oxygen ratio in the secondary combustion is in the range of 0.05 to 0.1, an oxygen ratio in the tertiary combustion is in the range of 0.9 to 1.1, and a total oxygen ratio is about 1.3.

Method for fusion treating a solid waste for gasification

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.degree. C. at a filtration velocity of 1-5 cm/sec under a pressure of from -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 for wastes

A method of treating wastes includes partially combusting the wastes in a fluidized bed reactor at a relatively low temperature followed by separate gasification of gaseous material and char from the first gasification in a separate relatively high temperature reactor. This forms synthesis gas that is cooled, subjected to a conversion operation to produce hydrogen.

Growing community of inventors

Tokyo, Japan

Kazuo Takano