High-temperature coal gas wet-method modified dry-method purification waste heat recovery system for HIsmelt melting reduction furnace and new technology thereof

Abstract

The invention relates to a high-temperature coal gas wet-method modified dry-method purification waste heat recovery system for a HIsmelt melting reduction furnace and a new technology thereof. The waste heat recovery system is changed into a dry-method system on the basis of an original wet method system. The system comprises a coal gas mixing temperature regulation chamber, a cyclone dust collector, a waste heat device, a high-temperature bag-type dust collector, a low-temperature coal gas backflow pipeline and a fan, the high-temperature coal gas of the HIsmelt melting reduction furnace passes through a vaporization cooling flue to recover waste heat and the temperature after cooling reaches 800 DEG C-900 DEG C, the high-temperature coal gas enters the coal gas mixing temperature regulation chamber and the low-temperature coal gas pumped back by a low-temperature backflow fan for mixing and temperature regulation, a pipeline is connected with the cyclone dust collector, the cyclonedust collector is connected with the waste heat device, the waste heat device is connected with the high-temperature bag-type dust remover, and the purified coal gas is supplied to users and on-site to use. According to the waste heat recovery system and the new technology thereof, the process is smooth, the coal gas enters the waste heat device after the coal gas is subjected to temperature regulation, the situation of waste heat device slag building-up and scaling is avoided, the heat exchange efficiency of the waste heat device is improved, the service life is prolonged, the technology adopts the high-temperature bag-type dust collector to purify the coal gas, and water resources are saved.

Description

technical field [0001] The invention relates to a HIsmelt smelting reduction furnace high-temperature gas wet system in the field of dust removal in the pyrometallurgy industry, in particular to a HIsmelt smelting reduction furnace high-temperature gas wet-to-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 molten state, which wi...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to overcome the problems existing in the existing HIsmelt smelting reduction furnace high-temperature gas purification waste heat recovery process, and provide a HIsmelt smelting reduction furnace high-temperature gas wet-to-dry purification waste heat recovery system and new process. The technical problem is to provide a new process of waste heat recovery from wet method to dry method to reduce the failure rate of waste heat devices and ensure stable operation

Images