A process and method for eliminating smoke plume through flue gas reheating in combination with CO low-temperature denitration

Abstract

A process and method for eliminating smoke plume through flue gas reheating in combination with CO low-temperature denitration are disclosed. On a flue of a wet desulphurization column, a gas-gas plate-type heat exchanger, a flue gas heater and a low-temperature denitration reactor are connected in order. The low-temperature denitration reactor is a rotary low-temperature denitration reactor or acirculating fluidized bed reactor. The flue after the low-temperature denitration reactor is connected to the gas-gas plate-type heat exchanger. Large smoke fume at an outlet of a chimney is eliminated through reheating of the flue gas after the desulphurization column, nitrogen oxides in the flue gas are removed at a low temperature (130-150 DEG C) and an ultra-clean emission standard for nitrogen oxides is met. The whole process is carried out after the wet desulphurization column, thus avoiding sulfur deactivation of a catalyst. The process and the method have characteristics of simple steps, convenient operation and high practicability.

Description

technical field [0001] The invention belongs to the field of flue gas reheating and white smoke elimination, and in particular relates to a process and method for flue gas reheating and white smoke elimination in cooperation with CO low-temperature denitrification. Background technique [0002] After the cancellation of GGH, the wet flue gas of the coal-fired power plant after wet desulfurization is directly discharged into the atmosphere from the chimney. When it comes into contact with the ambient air with a lower temperature, the temperature of the flue gas decreases, and the water vapor contained in it is supersaturated and condensed, and the condensed water droplets are exposed to light Refraction and scattering occur, so that the smoke plume appears white or off-white, which is called "wet smoke plume" (commonly known as "big white smoke", "white smoke plume", "colored smoke plume", etc.), which affects the appearance of the city. my country's Shanghai, Tianjin, Zhejia...

AI Technical Summary

Problems solved by technology

However, because the SCR technology uses ammonia as a reducing agent, it will cause corrosion to the pipeline. Improper control will easily cause secondary pollution caused by ammonia escape and blockage of the air preheater; most of the catalysts used are vanadium-titanium catalysts, and the biological toxicity is relatively high. High is a great threat to the ecological environment, and it is difficult to regenerate after poisoning and inactivation

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