Pyrolysis raw gas high-temperature efficient dust removal method

Abstract

The invention discloses a pyrolysis raw gas high-temperature efficient dust removal method which comprises the following steps of externally connecting an enclosure with induced draft equipment to form negative pressure in a gas purification chamber, and pumping high-temperature dust-containing raw gas into a pre-dust remover from an outlet of a coal gasifier to perform primary dust removal, enabling the pre-dedusted raw gas to enter a dust collection chamber, performing fine dedusting by utilizing a ceramic fiber filter tube, and enabling the pre-dedusted raw gas to enter a gas purification chamber to obtain high-temperature purified gas, transferring the high-temperature clean gas into a washing tower and a drop catcher for deep purification and cooling to finish dust removal, and afterlong-time work, using a high-pressure blowback system to perform blowback ash removal on the ceramic fiber filter tube. According to the dust removal method, high-temperature dust-containing raw gas can be directly filtered, the situation that the raw gas needs to be cooled before being filtered by a cloth bag dust removal device in an existing coal-to-gas process is improved, and the problem thatdust below 2 mum is removed and separated again is effectively solved.

Description

technical field [0001] The application relates to the technical field of coal gas dedusting and purification, in particular to a high-temperature and high-efficiency dedusting method for pyrolysis crude gas. Background technique [0002] Coal-to-gas refers to the process of injecting air, water vapor or hydrogen into coal or coal char to produce combustible gas under high temperature and high pressure conditions. It is an important way and means for clean utilization of coal resources. [0003] The application of coal gasification combined cycle power generation system has further promoted the development of coal-to-gas technology, but the high-temperature gas produced by coal-to-gas contains a large amount of dust, which will not only reduce the quality of gas, but also cause wear and tear on the blades of the gas turbine, reducing the efficiency of the gas turbine. service life and working efficiency. Therefore, it is necessary to dedust and purify the high-temperature ga...

AI Technical Summary

Problems solved by technology

[0005] The composition of high-temperature dusty crude gas is very complex. The initial temperature of crude gas is about 500°C~800°C, and it is sensitive to temperature changes. Tar is easy to condense when the temperature decreases; Particles agglomerate and adhere to the inner wall surface of the equipment, causing blockage of equipment and pipelines, seriously affecting the service life of the dust removal device

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