Device and method for denitrifying flue gas of coking furnace

Abstract

The invention discloses a device and method for denitrifying flue gas of a coking furnace by using citric acid as a catalyst. The device comprises a cooling device, a desulfurization device and a denitration device. The method for denitrifying flue gas of the coking furnace by using the device comprises the following steps of cooling the flue gas of the coking furnace three times; desulfurizing the flue gas of the coking furnace; carrying out first-stage denitration on the flue gas of the coking furnace; carrying out second-stage denitration on the flue gas of the coking furnace; and discharging the purified flue gas. The method disclosed by the invention is safe, reliable, high in denitration and absorption efficiencies, little in influences to the suction force of a chimney, free of waste liquid discharge and capable of reducing the operation cost at the desulfurization stage; the obtained product does not contain poisonous ammonium sulphate; and the contents of SO2, NO and NO2 in the discharged flue gas are far lower than the national flue gas discharge standard.

Description

[0001] technical field [0002] The invention relates to a coke oven flue gas denitrification device and method, in particular to a coke oven flue gas denitrification device and method using citric acid as a catalyst, and belongs to the field of coke oven flue gas denitrification. Background technique [0003] Since the founding of the People's Republic of my country, China's coking enterprises have been mainly based on extensive development, that is, to increase economic benefits by expanding the scale. There are mandatory regulations, but there is no mandatory standard for the content of nitrogen oxides. With the increasing environmental pollution in recent years, people have begun to pay attention to environmental issues. The new "Emission Standard of Pollutants for Coking Chemical Industry" implemented on October 1, 2012 has made mandatory regulations on the sulfur and nitrogen oxides in the flue gas emitted from the coking chimney. For the heat recovery coke oven, the fl...

AI Technical Summary

Problems solved by technology

The new "Emission Standard of Pollutants for Coking Chemical Industry" implemented on October 1, 2012 has made mandatory regulations on the sulfur and nitrogen oxides in the flue gas emitted from the coking chimney. For the heat recovery coke oven, the flue gas emitted from the chimney Medium SO 2 ≤100mg / m3, NO x ≤200mg / m3, currently there is no reformed coking enterprise, and the flue gas SO from the chimney 2 About 500mg / m3, NO x About 800-1500mg / m3, far exceeding the national standard

The operating temperature of the flue gas in the SCR process is 300-400°C, which is higher than the 260-270°C of the coke oven flue gas. Therefore, although the SCR has high denitrification efficiency, it cannot meet its operating conditions; The operating cost is high, and it is also a heavy burden for the low-profit coking industry

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