Gasification dry dedusting technology

Abstract

The invention discloses gasification dry dedusting technology which comprises the following technological steps: 1) the semi-water gas or the water gas from a normal-pressure or micro-positive pressure gasification furnace with gasification pressure of smaller than or equal to 0.1 MPa of smaller (gauge pressure) is dedusted by a cyclone dust collector to remove most of the dust, and then the gas enters a combined waste pot to exchange heat with soft water and saturated vapor to reduce temperature; 2) after temperature reduction, the semi-water gas or the water gas enters a soft water heater, the flow of the soft water is adjusted to reduce the temperature of the semi-water gas or the water gas going through the soft water heater once again; 3) after further temperature reduction, the semi-water gas or the water gas enters a bag-type dust collector to be dedusted and purified, wherein the air in the bag-type dust remover is replaced by inert gases; and 4) after fine dedusting, the semi-water gas or the water gas enters a spacing exchanger to reduce the temperature to 35-45 DEG C by a coolant and is prepared for producing or synthesizing ammonia or methanol. The technology has the advantages of avoiding the direct contact of the semi-water gas or the water gas with water, reducing the water consumption, enhancing the dedusting efficiency, protecting the environment, saving investment and operating expenses, and having great significance in environmental protection and large economic benefit.

Description

technical field [0001] The invention relates to the technical field of resources and environment—exhaust gas pollution prevention and control technology in the coal chemical conversion process, in particular to a coal gasification dry dust removal process. Background technique [0002] At present, the follow-up dust removal and cooling system of the atmospheric coal gasification process adopted by domestic small and medium-sized synthetic ammonia and small and medium-sized methanol enterprises adopts the water spray dust removal and cooling process, and the gas-making sewage containing a large amount of dust returns to the gas-making sewage system without pressure through the advection pool, After many times of sedimentation in the swirl pool, the clean water is cooled by the cooling tower and recycled, and the sludge is sent to be stacked or landfilled. The gas-generating sewage system is an open system. When the high-temperature sewage passes through the sedimentation tank...

AI Technical Summary

Problems solved by technology

[0003] Although there are currently many scientific research and technology units that have conducted a lot of research work on gas-generating sewage devices, all of these work have done a lot of research on the treatment of gas-generating sewage, and they all belong to follow-up treatment work, and have not solved the problem from the source.

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