Steel rolling heating furnace flue gas CO emission reduction and waste heat recovery collaborative ultra-low emission process

Abstract

The invention discloses a steel rolling heating furnace flue gas CO emission reduction and waste heat recovery collaborative ultra-low emission process. The process comprises an SCR / CO integrated reactor (5), a desulfurization unit (14) and a dust removal unit (15); a CO catalyst bed layer (8) is arranged at the middle lower part of the SCR / CO integrated reactor (5), a denitration catalyst bed layer (7) is arranged at the upper part of the CO catalyst bed layer (8), and a rectifying grid (6) is arranged at the top of the SCR / CO integrated reactor (5); a lower inlet of the SCR / CO integrated reactor (5) is connected with a waste heat recovery heat exchanger (10); the waste heat recovery heat exchanger (10) is connected with a preheating heat exchanger (2) and an air-smoke side ultra-low emission system (11) through a flue gas pipeline; the preheating heat exchanger (2) is connected with a lower inlet of the desulfurization unit (14) and an upper outlet of the SCR / CO integrated reactor (5) through a flue gas pipeline; and an upper outlet of the desulfurization unit (14) is connected with an inlet of the dust removal unit (15). With the steel rolling heating furnace flue gas CO emission reduction and waste heat recovery collaborative ultra-low emission process adopted, the CO emission reduction requirement of a steel rolling heating furnace is met, and the average value of the CO concentration of a flue gas outlet is smaller than or equal to 2000 mg / Nm < 3 >.

Description

technical field [0001] The invention belongs to the technical field of energy conservation and environmental protection, and in particular relates to an ultra-low emission process for CO emission reduction and waste heat recovery of flue gas in a steel rolling heating furnace. Background technique [0002] With the gradual advancement of "ultra-low emissions" in the iron and steel industry, the CO emission reduction standards for industrial flue gas with high content have been increased. Not higher than 2000mg / Nm 3 Wait. [0003] The iron and steel industry is a major emitter of air pollutants, and the steel rolling furnace is one of the main sources of CO emissions. According to the field experimental data, the flue gas components of a certain steel rolling heating furnace were monitored for 4 consecutive hours after dust removal, desulfurization and denitrification. The test results It shows that the CO emission value is generally 20000~50000ppm, and the highest value on...

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Problems solved by technology

[0003] The iron and steel industry is a major emitter of air pollutants, and the steel rolling furnace is one of the main sources of CO emissions. According to the field experimental data, the flue gas components of a certain steel rolling heating furnace were monitored for 4 consecutive hours after dust removal, desulfurization and denitrification. The test results It shows that the CO emission value is generally 20000~50000ppm, and the highest value once appeared at 70000ppm + ppm; this emission value cannot meet the requirements of ultra-low emission standards

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