High-temperature water slag flushing dead steam energy-saving water collection and pollutant treatment system and method

Abstract

The invention provides a high-temperature water slag flushing dead steam energy-saving water collection and pollutant treatment system and method. The system comprises a high-altitude granulation tower, a slag washing water inlet, a high-temperature slag inlet, a liquid collecting device, a spraying device, a mixed air heating area, a mixed gas induced draft fan, a slag washing pool, a spraying water condensation water treatment unit, a dead steam bypass condenser, a gas heat source unit, a demister and a hygrothermograph, wherein the slag washing pool is connected with the tower wall of the bottom of the high-altitude granulation tower, the spraying water condensation water treatment unit is connected with the liquid collecting device and the spraying device, the inlet of the dead steam bypass condenser is connected with the tower wall of the high-altitude granulation tower through a dead steam bypass pipeline leading-out section A1, the outlet of the dead steam bypass condenser is connected with the inlet of the second demister, and the outlet of the second demister is connected with one side of the mixed air heating area through a dead steam bypass pipeline leading-back sectionA2. According to the invention, blast furnace slag flushing dead steam can be deeply purified, the discharge amount of hydrogen sulfide, sulfur dioxide and other acid pollutants is reduced, slag flushing dead steam waste heat recycling is achieved, and the water consumption of a slag flushing system is greatly reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of colored smoke plume purification in the metallurgical industry, in particular to a system and method for flushing slag with high-temperature water, exhausting steam, energy-saving water collection and pollutant treatment. 【Background technique】 [0002] In the metallurgical industry, the high-temperature slag produced by industrial furnaces such as steel blast furnaces and converters, non-ferrous copper smelting furnaces and aluminum melting furnaces often uses water as a cooling medium during the slag cooling process, such as blast furnace slag water quenching process, rotary Slag hot stuffy slag or hot pouring process, etc. Taking the blast furnace as an example, about 80% of the blast furnace slag is quenched by water. Each ton of pig iron produces about 0.3-0.4 tons of blast furnace slag, and each ton of slag consumes about 9-10 tons of slag washing water. When the slag flushing water touches the ...

AI Technical Summary

Problems solved by technology

For example, Patent Publication No. CN103060494B proposes a steam recovery type blast furnace slag flushing water system. Its key technology uses spraying to recover the exhausted steam generated at the slag flushing port, but does not consider plume treatment, and does not target the exhausted steam in the slag flushing pool. Recycling; Patent Publication No. CN208667759U proposes a system for dust removal, dehydration, and whitening of blast furnace water slag granulation tower. Its key technology uses GGH to carry out heat exchange treatment for the exhausted steam of slag flushing before and after condensation treatment, but there is a major corrosion problem in GGH equipment. risk, and the visual pollution cannot be completely eliminated in winter; Patent Publication No. CN208883918U proposes a whitening and waste heat utilization system for slag flushing water. Failed to completely eliminate visual pollution; Patent Publication No. CN209322919U proposes an environmental protection whitening treatment and waste heat utilization system for blast furnace slag. Condensation treatment, but the spray system needs to add a lot of fresh water, and there is no heating system to completely eliminate visual pollution; Patent Publication No. CN209348354U proposes a blast furnace slag flushing flue gas whitening integrated device, the key technology of which is only for flushing slag waste steam Mixed heating fails to achieve the purification effect of pollutants; Patent Publication No. CN209910414U proposes a whitening device, the key technology of which is to use water coolers and air coolers in series to treat high-temperature and high-humidity flue gas or steam, and there is an air cooler for heat exchange The problem of low efficiency; Patent Publication No. CN210206387U proposes a self-heating flue gas whitening device, its key technology adopts the method of setting reheaters and air coolers in turn from top to bottom in the whitening tower, and the flue gas cooling and reheating whitening can not Additional heat is required, but the reheater has a major risk of corrosion, the air cooler consumes a lot of gas, and the piping layout is too complicated; patent application number 201910944801.6 proposes a blast furnace slag flushing waste steam whitening and waste heat recovery device, the key technology of which is only hedging The exhaust steam condensation treatment produced by the slag mouth has the problems of incomplete treatment scope, large air condensation system, large air consumption, and low heat source grade; Publication No. CN109457065A proposes a recovery system for ironmaking blast furnace slag water exhaust steam, its key technology It adopts the series design of spraying and heat exchanger to carry out the exhaust steam condensation treatment of the slag flushing system, and the pollutant control effect is good, but the circulating water used by the spraying device and heat exchanger is sent to the cooling tower for direct cooling, resulting in a large amount of low-temperature water. Waste of resources and energy

[0004] It can be seen from the above analysis that although the existing technology has provided a method for exhaust steam elimination and waste heat recovery in the blast furnace slag flushing system, there are still various degrees and aspects of defects that need to be improved. It is necessary to develop a relatively complete, energy-saving and high-efficiency method. , An economical and reliable high-temperature water flushing slag exhaust steam energy-saving water collection and pollutant treatment system and method to meet the governance needs of the blast furnace water flushing slag system

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