Ihi Corporation

Ishikawajima-harima Heavy Industries Co., Ltd.

Koubun Kyo

Takahiro Murakami

Toshiyuki Suda

Toshiro Fujimori

Shigeru Kusama

A fuel gasification system including a gasification furnace including a fluidized bed formed by fluidizing reactant gas for gasifying fuel charged into gasification gas and flammable solid content, a combustion furnace for combustion of the flammable solid content into which the flammable solid content produced in the furnace is introduced together with bed material and that includes a fluidized bed formed by fluidizing reactant gas, a material separator such as hot cyclone that separates bed material from exhaust gas introduced from the combustion furnace, the separated bed material being fed through a downcomer to the gasification furnace, and a tar decomposing mechanism that heats the gasification gas produced in the furnace to decompose tar contained in the gasification gas.

Fuel gasification system including a tar decomposer

Fuel gasification system

A gasification process is divided into three processes: a gasification furnace for carrying out gasification process by pyrolysis and gasification (pyrolysis gasification phase, first process), a combustion furnace for burning char to obtain calcined active chemical (char combustion phase, second process) and a gas purification furnace for purifying gasified gas (gasified gas purification phase, third process). Through heat transmission by the fluid heat medium and chemical reactions in respective phases by the chemical, the gasification furnace is independently controlled to a low or medium temperature (773-1073 K) which is required for gasification and which enables absorption of CO; and the gas purification furnace is controlled to a high temperature (1073 K or more) required for gas purification.

Method for gasifying solid fuel with unified gas purification and gasifier using said method

An object of the invention is to enhance gasification efficiency of flammable solid content when high fuel ratio fuel having fixed carbon content in large quantity is to be gasified. A material downcomerfor introduction of bed materialseparated in a material separatorand a fuel supply portfor introduction of gasification fuelare arranged at one side of a gasification furnace; a solid content supply portfor supply of flammable solid contentand the bed materialin the gasification furnaceto the combustion furnaceis arranged at the other side of the gasification furnace. In the gasification furnaceand between the one and the other sides of the furnace, vertical partition platesare arranged to provide a zigzag curved flow passagewith upper and lower turns.

Method and device for gasifying gasification fuel

In order to improve sealing properties between a downcomer and a high-speed layer and in order to efficiently take out produced gas obtained through gasification of, for example, a solid reactant, a syphon for sealing between a downcomer and a high-speed layer through temporary storage of particles moving from the downcomer to the high-speed layer comprises a reactor portion for causing the solid reactant to conduct chemical reaction through action of the particles, a downcomer seal portion in communication, at upper and lower ends thereof, with the downcomer and a lower portion the reactor portion, respectively, a particle outlet seal portion provided in a spaced apart relationship from the downcomer seal portion and in communication, at upper and lower ends thereof, with the high-speed layer and the lower portion of the reactor portion, respectively, and a freeboard portion formed above the reactor portion.

Reactor-integrated syphon

In order to quantitatively evaluate actual circulation quantity of bed material extremely simply and to enhance accuracy of comparison of results of thermal balance examined through simulation or the like with actual operation results, time is measured which is required for bed material in a downcomerto reach an upper predetermined height Hfrom a lower reference height Hduring stopped feeding of fluidizing air to an external heat exchangera flow rate of the bed material as circulation quantity is determined from the time and an accumulated amount of the bed material based on an inner diameter D of the downcomer

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Koto-ku, Japan

Koubun Kyo