Hitachi, Ltd.

Babcock-hitachi Kabushiki Kaisha

Eiji Kida

Shuntaro Koyama

Atsushi Morihara

Sinji Tanaka

Hisao Yamashita

Shigehito Takamoto

Takanori Kudo

Tomohiko Miyamoto

Jinichi Tomuro

Sadao Takahashi

Masato Takagi

Fumiki Ueda

Tadayoshi Muramatsu

Akio Ueda

A coal gasifier has an inner wall surface made by metal of an inlet part of a heat recovery vessel, the inlet part having a inner cooling mechanism, and gas for peeling deposits on the inner wall surface is injected from plural gas injection holes, the injected gas forming a slewing flow and further being intermittently increased. And at least one cooling medium injection nozzle is provided at a side wall in the upper part of a gasification chamber.

Coal gasifier and using method thereof

According to the apparatus and method, combustible gas having a stable composition can be formed even if the load is charged. Burners are provided in the upper and the lower regions of an entrained bed coal gasification reactor. The temperature of the product gas is kept low in the upper region and high in the lower region. The volumes of the upper and lower regions are changed to meet the load so that the rate of heat loss becomes constant even if the load changes. Since the rate of heat loss can be kept constant and consequently variation of the composition of the product gas can be suppressed small, the efficiency of the coal gasification electric power generating system can be kept constant.

Entrained bed coal gasification reactor and method of gasifying coal

The present invention provides a desulfurizing agent comprising a porous oxide carrier, at least one of molybdenum oxide and tungsten oxide as a first component, supported on the carrier, and at least one of manganese oxide, cobalt oxide and nickel oxide as a second component, supported mainly on the surface of the first component. In a coal gasification system using the present desulfurizing agent and a power generation system using the purified gas therefrom, a reduction column for converting a portion of sulfur dioxide in the regenerated gas to hydrogen sulfide as a pretreatment means to a Claus reaction column can be eliminated when the desulfurizing agent is regenerated. Furthermore, in the present invention a desulfurizing agent capable of reacting with hydrogen sulfide to form a solid sulfur compound at a high temperature is supplied to a gasification furnace and the resulting sulfur compound is withdrawn from the gasification furnace as molten slag together with ashes of fine coal powder, where desulfurization can be attained without a Claus reaction column and without a reduction column. Such desulfurization is likewise applicable to a coal gasification system and a power generation system based on the coal gasification.

Desulfurizing agent and process for treating hydrogen sulfide containing

Growing community of inventors

Hiroshima, Japan

Eiji Kida