Coal gas pulse dry-process recovery and purification system and method for medium-high pressure gasification furnace

Abstract

The invention relates to a pulse dry recovery and purification system and method for coal gas of a medium-high pressure gasification furnace, and the system comprises a medium-high pressure coal gas gasification furnace, heat exchange equipment, separation equipment, a dust removal system and a clean coal gas pipe network which are connected in sequence, and the dust removal system comprises a low-pressure pulse bag type dust remover and a depressurization clean coal gas reverse injection system; the low-pressure pulse bag type dust collector is used for filtering and purifying dust-containing coal gas into clean coal gas with the dust content of 5 mg/m < 3 > or below, and the depressurization clean coal gas reverse injection system is used for reducing the gas pressure in the low-pressure pulse bag type dust collector and then carrying out filter bag pulse dust collection; the depressurized clean gas reverse injection system comprises a high-pressure clean gas pressure relief system, a discharged clean gas recycling and pressurizing system, a high-pressure gas storage tank and a clean gas injection gas source pipeline with a pulse valve. The method has the advantages that the technical problem that pulse ash removal cannot be carried out on the medium-high pressure coal gas is solved, the problem that dry recovery of the coal gas of the medium-high pressure gasification furnace is difficult is solved, and the requirements of energy conservation, emission reduction and environmental protection policies are met.

Description

technical field [0001] The invention belongs to the technical field of recovery and purification of high-pressure gasification furnace coal gas, and more specifically relates to a system and method for pulse dry recovery and purification of medium and high-pressure gasification furnace gas through a pulse bag filter. Background technique [0002] With the rise of the coal chemical industry, medium and high pressure coal gasification furnaces have been widely promoted due to their unique advantages, and new problems have emerged. The pulse cleaning technology successfully applied to the dry gas recovery process of low pressure coal gasification furnaces The high-pressure coal gasification furnace can no longer be used, so the gas recovery and purification process of the medium and high-pressure coal gasification furnace has gone back to the 90-year-old process, that is, the wet process or the electrostatic precipitator process. However, the following problems exist in the abo...

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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a medium and high pressure gasification furnace gas pulse dry recovery and purification system and method, which are used to solve the problem that the gas pressure of the medium and high pressure gasification furnace is much higher than the pulse recovery process when the bag type recovery and purification process is used. The working pressure allowed by the valve cannot realize the problem of pulse cleaning, and the dry recovery and purification of the medium and high pressure gasification furnace gas can overcome the above-mentioned deficiencies in the prior art

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