Coke oven flue gas denitrification device and method

Abstract

The invention discloses a coke oven flue gas denitrification device and method using citric acid as a catalyst. The device includes a cooling device, a desulfurization device and a denitrification device. The method for denitrifying coke oven flue gas using the device includes the following steps: Furnace flue gas is cooled for three times; coke oven flue gas desulfurization; coke oven flue gas first-stage denitrification; coke oven flue gas second-stage denitrification; flue gas emission purification. The method of the present invention is safe and reliable, has high denitrification efficiency, high absorption efficiency, little influence on the chimney suction, no waste liquid discharge, can reduce the operation cost of the desulfurization section, the product is non-toxic ammonium sulfate, and the content of SO2, NO and NO2 in the discharged flue gas Far below the national smoke emission standard 。

Description

technical field [0001] 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 [0002] 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 flue gas em...

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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