Coke oven flue gas waste heat utilization and purification method

Abstract

The invention relates to the technical field of coke oven flue gas integrated utilization and pollution treatment and in particular relates to a coke oven flue gas waste heat utilization and purification method. The method is characterized in that flue gas waste heat is recovered by utilizing a flue gas waste heat recovery device, the temperature of the flue waste gas is reduced, and integrated desulfurization and denitration of the flue waste gas is realized by utilizing the activated adsorption capacity and low-temperature denitration catalytic capability of the coke. Compared with an existing process, the method has the beneficial effects that the flue waste gas desulfurization and denitration is performed under low-temperature working conditions, an additional heating system is not needed, and the energy consumption is reduced. In order to realize the desulfurization and denitration under low-temperature working conditions, the flue waste gas is cooled through the waste heat recovery device, so that the waste heat of the flue waste gas is fully utilized. The coke serves as a main catalyst for desulfurization and denitration and comes from a coking plant, the source is sufficient, and waste loss is avoided. The method disclosed by the invention can be widely applied to pollution treatment and integrated utilization of coke oven heated flue waste gas in coking production enterprises.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization and pollution control of coke oven flue exhaust gas, in particular to a method for utilizing and purifying waste heat of coke oven flue exhaust gas. Background technique [0002] The coke oven flue gas is the product of combustion in the coke oven heating system. The temperature is below 300°C, and the temperature at the root of the chimney is about 230-280°C. The waste gas contains a lot of heat energy and should be recycled. At the same time, during the combustion process of coke oven heating fuel, NOx that is harmful to the environment will be generated at high temperature. Because the fuel used for coke oven heating is different, the content of NOx in the exhaust gas is also different, but usually the concentration of NOx in the exhaust gas is different. If it exceeds the emission limit specified by the relevant national standards, it is necessary to remove NOx in the flue ga...

AI Technical Summary

Problems solved by technology

Therefore, in addition to the SCR reaction device, an ammonia station, a flue gas heating system, a boiler waste heat recovery system, and a GGH heat exchange device must also be built, resulting in a large system, high investment, and high energy consumption.

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