Method for recovering blowing gas

Abstract

The invention relates to a method for recovering blowing gas, in particular to a method for recovering the blowing air of a coal gas producer. The method comprises a gas blowing stage, an upward blowing stage and a downward blowing stage. The three stages are carried out circularly. The method is characterized in that in the gas blowing stage, air is divided into three paths after flowing through a blowing valve to be introduced into the coal gas producer, wherein the first path of air directly enters the coal gas producer from the bottom of the coal gas producer, the second path of air provides the air for combustion of the blowing gas in a combustion barrel pipeline in the coal gas producer and the third path of air provides the air for combustion of the blowing gas on the surface of a carbon layer in the coal gas producer again; and one part of heat generated by combustion is stored inside heat storage fillers and the other part of heat generated by combustion is used for carrying out dry distillation on carbon on the surface of the carbon layer in the coal gas producer. In the invention, by sufficient combustion of the blowing gas, the aims of thickening a dry distillation layer, prolonging the coal dry distillation time, activating the carbon, improving the coal gas quality and increasing the gas production amount are fulfilled, the difficult problem that sensible heat and latent heat of the blowing gas cannot be recovered according to furnaces in the process of gasifying faulty lump coal or moulded coal is solved, a method of preparing power steam from high-quality coal is changed, and the effects of saving energy and reducing consumption are remarkable.

Description

technical field [0001] The invention relates to a coal gasification method, in particular to a method for recovering blown gas from a coal gasifier. Background technique [0002] For neutral nitrogen fertilizer enterprises that use coal as raw material, most of the intermittent gasifier processes of their gas-making systems are basically the same. The raw material used in the original design is high-quality lump coal. The recovery of heat and latent heat adopts the following process recovery, that is, gas generator→combustion chamber→tube waste heat boiler→chimney, and the exhaust gas temperature is about 200℃. In recent years, the supply of high-quality lump coal has been tight. In order to reduce costs, many enterprises want to replace high-quality lump coal with low-quality lump coal or briquette coal. Due to the low operating temperature of the furnace surface of the intermittent gas generator (<350°C), the corresponding blowing air temperature is less than 350°C. Be...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to provide a blowing gas recovery method to solve the problem that the gasification of inferior lump coal or molded coal cannot recover the sensible heat and latent heat of the blowing gas in separate furnaces, and to change the practice of using high-quality coal to produce steam for power

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