High-temperature water slag flushing steam colored smoke plume treatment system and method

Abstract

The invention provides a high-temperature water slag flushing steam colored smoke plume treatment system and method, and the system comprises a granulation white smoke elimination tower, a slag flushing water inlet, a high-temperature slag inlet, a spraying device, a condenser, a second demister, a re-heater, an exhaust fan, a slag flushing pool, a water spraying unit and a heat taking unit, the slag flushing pool is connected with the tower wall at the bottom of the granulation white elimination tower through a slag ditch A, and the side wall at the top of the slag flushing pool is connectedwith the tower wall of the granulation white elimination tower through a steam return pipeline B; wherein a high-temperature slag runner of the heat removal unit is connected with a high-temperature slag inlet in the bottom of the granulation white elimination tower, the heat removal pipe bundle is arranged under the ground of the high-temperature slag runner, an inlet of the heat removal pipe bundle is connected with a heating medium water outlet of the re-heater, and an outlet of the heat removal pipe bundle is sequentially connected with a heating medium water pump and a heating medium water inlet of the re-heater. 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 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 plume purification in the metallurgical industry, in particular to a system and method for treating colored plume by high-temperature water flushing slag steam. 【Background technique】 [0002] In the metallurgical industry, about 80% of the high-temperature slag produced by the ironmaking blast furnace is cooled by water quenching. 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 the slag flushing pool, a large amount of slag flushing steam will be evaporated, taking away about 40% of the heat of the high temperature slag, and the temperature is 80-100°C. In 2019, my country's blast furnace pig iron output was 809 million tons, and about 2 billion tons of slag washing water not only has a large amount of low-temperature ...

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 environmental-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 in 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 , but the reheater has a major risk of corrosion, the air cooler consumes a lot of gas, and the pipeline layout is too complicated; patent application number 201910944801.6 proposes a blast furnace slag flushing steam whitening and waste heat recovery device, the key technology of which is only generated by the slag flushing port There are problems such as incomplete treatment range, large air condensing system, large air consumption, and low heat source grade; Publication No. CN109457065A proposes a waste steam recovery system for ironmaking blast furnace slag flushing water, the key technology of which is to use spray Showers and heat exchangers are designed in series to carry out exhaust steam condensation treatment in 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 waste of low-temperature water resources and energy

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

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