Coal gasification method and device of suspension bed

Abstract

The invention relates to a coal gasification method of a suspension bed. The method comprises the following steps of: feeding coal powder and a gasification agent from the lower part of a gasification furnace at certain speed and pressure; forming a rotational flow by the coal powder and combusting the coal powder; blowing and agitating the coal powder by using the gasification agent; rapidly gasifying the coal powder part and leading out a mixed gas generated by gasifying the combusted and gasified ash from the upper part of the gasification furnace. The invention also provides a gasification device for the method, which comprises a gasification furnace and a separating device; feeding openings are respectively arranged on the side wall and the bottom of the gasification furnace; the gasification furnace comprises a cylinder and a cone; the cone is arranged on the lower part of the cylinder and the cylinder is connected with the separating device. The device provided by the invention has the advantages of simple structure and high work efficiency. The method and device provided by the invention have the advantages of moderate gasification temperature, low gasification pressure, multiple applicable coals, simple gasification process, low investment, low operation cost and the like, and are especially suitable for manufacturing low-pressure coal industrial gas.

Description

technical field [0001] The invention relates to the field of coal gasification, in particular to a suspended bed coal gasification method and a device thereof. Background technique [0002] "Gas energy" has been widely valued and actively developed by countries all over the world. Similarly, in my country, gas energy has become an important part of my country's energy strategy development, and will likely occupy a dominant position in my country's energy structure in the future. [0003] Coal gasification is one of the main ways to use coal cleanly and efficiently. Long-term production practice shows that among various technologies that transform coal into more convenient energy and product forms, coal gasification is a processing method that should be given priority. Countries all over the world have done a lot of long-term work for the development of coal-to-gas technology. There are three types of gasification technologies currently used to produce industrial gas: fixed...

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Problems solved by technology

[0015] To sum up, whether it is an atmospheric fixed bed or a pressurized fixed bed, due to the existence of dry distillation components, the gas contains tar, benzene, phenol and other components, and it is difficult to purify; and the selection of coal needs to use lump coal, The range of coal selection is narrow and the economy is poor; fluidized bed technology still has many uncertain factors, and it cannot completely eliminate pollution. The use of end-coal gasification will be an important direction for the development of coal-based industrial gas at present, but entrained bed gasification technology is generally high-temperature and high-pressure gasification, the system investment is large, the operating cost is high, and generally liquid slag is used, which is harmful to the environment. Coal whose ash melting point exceeds 1500° is not suitable, and the ash above 1200° needs to be quenched with water to below 200° during the slag discharge process, and this part of heat loss cannot be recovered

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