Purifying and tar recovery system for high temperature gas containing ash and tar and method thereof

Abstract

The invention discloses a purifying and tar recovery system for high temperature gas containing ash and tar and a method thereof. A high temperature cyclone dust collector, a high temperature electric dust collector, an exhaust-heat boiler, a first level electrical tar precipitator, an intercooler, a second level electrical light oil precipitator and a gas exhauster are connected in order. High-temperature raw gas containing ash and tar from coal pyrolysis technology successively passes through the high temperature cyclone dust collector and the high temperature electric dust collector to be subjected to high temperature dusting; dusted raw gas is subjected to waste heat recovery in the exhaust-heat boiler by cooling water to generate low pressure steam; after the exhaust-heat boiler is cooled, the raw gas is introduced into the first level electrical tar precipitator for tar precipitation; output raw gas is cooled in the intercooler by cooling water; outlet gas enters into the second level electrical light oil precipitator; and purified is sent out by the gas exhauster. The invention can realize cooling, heat recovery and effective tar precipitation of high-temperature pyrolysis gas containing ash and tar, and greatly reduce waste water discharge, so as to save energy and reduce emission.

Description

technical field [0001] The invention relates to a gas purification system and technology, in particular to a high-temperature gas purification system containing ash and tar, a tar recovery system and a method thereof. Background technique [0002] Gas purification process is widely used in various gas production and use systems, typically including coking furnace gas purification process and producer gas purification process. The tar content in general gas is 50-200g / Nm 3 , fly ash content reaches 5-20g / Nm 3 . Therefore, the general purification process includes cooling, washing, post-treatment and other main process contents. The process of coal gas purification, ash removal and tar recovery is to directly spray circulating ammonia water at 70-75°C to the high-temperature raw coal gas to reduce it to 80-82°C, and then let the gas enter the primary cooler and indirectly cool it to 25°C with cooling water. -35°C. Then the sprayed circulating ammonia water and condensed t...

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Problems solved by technology

[0007]? In order to make the recycled ammonia nitrogen of the wastewater meet the standard,

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