Ebara Corporation

Ube Industries, Inc.

Other

Agency of Industrial Science and Technology

Seiichi Ishizaka, President of Agency of Industrial Science and

Shosaku Fujinami

Takahiro Oshita

Tetsuhisa Hirose

Kazuo Takano

Masaaki Irie

Shuichi Nagato

Norihisa Miyoshi

Yoshio Hirayama

Hiroyuki Fujimura

Toshio Fukuda

Seiichiro Toyoda

Shugo Hosoda

Yoshiaki Ishii

Naoyoshi Ando

Tsutomu Kume

Chikashi Tame

Yoshio Kosaka

Shinichirou Chiba

Osamu Kameda

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

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 combustibles by slagging combustion, such as municipal wastes, plastic wastes, sewage sludges, or automobile wastes. Combustibles and oxygen-containing gas are supplied to a slagging combustion furnace (,), and the combustibles are partially oxidized under a reducing atmosphere in a primary combustion chamber (,) to obtain combustible gas and convert ash content in the combustibles into molten slag which is discharged from a slag separation chamber (,), and then the combustible gas is completely combusted in a secondary combustion chamber (,) by supplying oxygen-containing gas.

Method for treating combustibles by slagging combustion

The present invention relates to a swirling-type melting furnace for gasifying combustible wastes and/or coal, and a method of gasifying wastes by the swirling-type melting furnace. In the swirling-type melting furnace (,), gaseous materials supplied to a combustion chamber (,) form a swirling flow which includes an outer swirling flow primarily containing particulate combustibles and an inner swirling flow primarily containing gaseous combustibles. Oxygen is supplied through an inner wall of the combustion chamber (,) to the outer swirling flow primarily containing the particulate combustibles for thereby accelerating gasification of the particulate combustibles.

Swirling-type melting furnace and method for gasifying wastes by the swirling-type melting furnace

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

Swirling-type melting furnace and method for gasifying wastes by the

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

Shosaku Fujinami