High-temperature water-washed slag steam pollutant deep treatment system and treatment method

Abstract

The invention provides a high-temperature water slag washing steam pollutant deep treatment system and treatment method, the system comprises a granulation tower, a slag washing water inlet, a high-temperature slag inlet, a spraying device, a demister, a spraying liquid supply system and a slag washing pool, the spraying liquid supply system is connected with the spraying device; wherein the slagflushing pool is connected with the tower wall at the bottom of the granulation tower through a slag ditch, and the side wall at the top of the slag flushing pool is connected with the tower wall of the granulation tower through a steam return pipeline. Wherein the spraying liquid supply system comprises a filter, a settling water tank, a booster water pump and a heat exchanger which are sequentially connected through a spraying water pipeline, a liquid collecting device is arranged below the spraying device, and an inlet of the filter is connected with an outlet of the liquid collecting device. The blast furnace slag flushing steam can be deeply purified, the discharge amount of hydrogen sulfide, sulfur dioxide and other acid pollutants is reduced, slag flushing steam waste heat recyclingis 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 purification of colored plume in the metallurgical industry, in particular to a system and method for advanced treatment of high-temperature water flushing slag steam pollutants. 【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 high temperature slag and is transported to...

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 blast furnace water slag granulation tower dust removal, dehydration, and whitening system. The key technology uses GGH to perform heat exchange treatment on the slag steam before and after condensation treatment, but there is a major risk of corrosion in GGH equipment , and failed to completely eliminate visual pollution in winter; Patent Publication No. CN208883918U proposes a whitening and waste heat utilization system for slag washing water. It can completely eliminate visual pollution; Patent Publication No. CN209322919U proposes an environmentally friendly blast furnace slag whitening treatment and waste heat utilization system. Its key technology uses heat exchangers and spray devices in series to condense exhausted steam at the slag flushing port and slag flushing pool treatment, but the spraying system needs to replenish a large amount 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, and its key technology only mixes and heats the slag flushing steam , failed 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 the heat exchange efficiency of the air cooler is low problem; Patent Publication No. CN210206387U proposes a self-heating flue gas whitening device, its key technology adopts the method of setting reheaters and air coolers sequentially from top to bottom in the whitening tower, and the flue gas cooling and reheating whitening does not require additional However, the reheater has a major risk of corrosion, the air cooler consumes a lot of gas, and the pipeline layout is too complicated; the publication number CN110819747A proposes a blast furnace slag flushing steam whitening and heat exchanger, and its key technology is only for the slag flushing port. The treatment of exhaust steam condensation has the problems of incomplete treatment scope, huge air condensation system, large air consumption and low grade of heat source

[0004] From the above analysis, it can be seen that although the existing technology has provided a method for the elimination of whitening and waste heat recovery of 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, efficient, and economical method. Reliable high-temperature water slag flushing steam pollutant deep treatment system and method to meet the treatment needs of blast furnace slag flushing system

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