Dry-process purification waste heat recovery system for high-temperature coal gas of HIsmelt smelting reduction furnace and novel technology

Abstract

The invention relates to a dry-process purification waste heat recovery system for high-temperature coal gas of a HIsmelt smelting reduction furnace and a novel technology. The system comprises a vaporization cooling flue, a coal gas mixing temperature adjusting chamber, a cyclone dust collector, a high-temperature bag-type dust collector, a waste heat device and a fan; the high-temperature coal gas of the HIsmelt smelting reduction furnace reaches the temperature of 800 DEG C-900 DEG C after being subjected to waste heat recovery and cooling through the vaporization cooling flue, enters the coal gas mixing temperature adjusting chamber to be mixed with low-temperature coal gas extracted by low-temperature backflow wind so as to adjust the temperature of the coal gas to a required value ofthe technology and enters the cyclone dust collector through a pipeline for primary dust removal, the coal gas subjected to primary dust removal enters the high-temperature bag-type dust collector, the smoke dust concentration after fine dust removal is less than 10 mg / Nm<3>, clean coal gas subjected to two-stage dust removal enters the waste heat device for waste heat recovery, the temperature of the coal gas is decreased to about 200 DEG C, and the purified coal gas is used by a user and is for the field use. According to the system and the novel technology, the process is smooth, slag adhesion and scaling of the waste heat device are avoided, the heat exchange efficiency of the waste heat device is improved, the service life is prolonged, the coal gas is purified by adopting the high-temperature bag-type dust collector, and water resources are saved.

Description

technical field [0001] The invention relates to an HIsmelt smelting reduction furnace high temperature gas purification waste heat recovery system in the field of dust removal in the pyrometallurgy industry, in particular to a HIsmelt smelting reduction furnace high temperature gas dry purification waste heat recovery system and a new process. Background technique [0002] HIsmelt smelting reduction furnace will produce high temperature gas during the smelting process. The temperature of these high-temperature gas can be as high as above 1500°C, which contains a large amount of sensible heat. The gas also contains a large amount of sticky iron slag particles. If it is not treated, it will cause energy waste and affect the use of subsequent users. [0003] The commonly used system now is the wet system. In the wet system, the temperature of the flue gas entering the waste heat device is too high, as high as 800 ° C. At this time, the flue gas is mixed with slag particles in a...

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Problems solved by technology

[0006] Another object of the present invention is to overcome the defects of the existing HIsmelt smelting reduction furnace high temperature gas purification waste heat recovery system and technology, and provide a new HIsmelt smelting reduction furnace high temperature gas dry purification waste heat recovery system and new The technical problem to be solved is to waste a large amount of sensible heat and the gas contains a large amount of sticky iron slag particles, so that it can increase the efficiency of waste heat recovery, reduce the amount of water resources, and achieve the purpose of energy saving and emission reduction, so it is more suitable for practical use.

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