Circulating fluidized bed gasification device and gasification method with grading air distribution effect

Abstract

A circulating fluidized bed gasification device with a grading air distribution effect comprises a hearth (1), a gas-solid separation device (2) and a returning system, wherein the hearth (1) is provided with auxiliary gasification agent inlets (m1 to m4). The invention also provides a circulating fluidized bed gasification method with the grading air distribution effect. By means of the circulating fluidized bed gasification device and gasification method with the grading air distribution effect, the gasification efficiency is improved, and the carbon content in fly ash is reduced.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a circulating fluidized bed gasification device with graded air distribution and a circulating fluidized bed gasification method with graded air distribution. Background technique [0002] As an efficient and clean clean coal technology, coal gasification technology is a main way to convert solid primary energy such as coal into gaseous clean secondary energy. This technology is mainly used for synthetic ammonia, synthetic methanol, hydrogen production, and blast furnace reduction ironmaking. Such as chemical metallurgical industry, combined cycle power generation field, industrial and civil gas field and many other fields. [0003] Classified according to the movement state of solid fuel, modern coal gasification processes mainly include moving bed (also known as fixed bed) gasification, entrained bed gasification and fluidized bed gasification. Fluidized bed coal gas...

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Problems solved by technology

[0004] The structural performance of the circulating fluidized bed coal gasifier is restricted by the law of fluidization. Its advantages benefit from this, and at the same time, it also brings adverse effects. For example, the conventional circulating fluidized bed coal gasifier has the following Problem: 1. The materials in the furnace are evenly mixed and the temperature is uniform, but the production of gas requires that the furnace must maintain a reducing atmosphere, that is to say, the materials in the furnace must maintain a high carbon content, which makes circulating fluidized bed gas The bottom slag and fly ash of the gasification furnace have high carbon content; 2. In a conventional circulating fluidized bed coal gasification furnace, the feeding position of the gasification agent and raw coal determines that the middle and upper parts of the furnace are in the reduction zone, and the material concentration High, a large amount of heat is needed to obtain high gasification efficiency, but the heat provided by the existing technology for this area is relatively insufficient, which affects the improvement of gasification efficiency

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