Desulfurization and denitrification mixed reaction device and desulfurization and denitrification integrated process

Abstract

The invention discloses a desulphurization and denitrogenation hybrid reaction device and a desulphurization and denitrogenation integrated process. The reaction device comprises a device body, a reaction kettle and at least one smoke pipeline, wherein the reaction kettle and the smoke pipeline are arranged in the device body; a smoke inlet, a smoke outlet and an ozone inlet which are communicated with the reaction kettle are formed in the device body, and the reaction kettle is communicated with the smoke inlet through the smoke pipeline; and a closed first cooling medium channel is formed among the device body, the reaction kettle and the smoke pipeline, and a first cooling medium inlet and a first cooling medium outlet which are communicated with the first cooling medium channel are further formed in the device body. The desulphurization and denitrogenation integrated process comprises the steps of removing dust, exchanging heat, introducing ozone for reaction, and carrying out alkaline liquid absorption. The reaction device can be used for simultaneously carrying out heat exchange, desulphurization and denitrogenation, so that the waste heat in the smoke can be recycled, the heat exchange efficiency is high, and the ozonolysis caused due to the over-high temperature of smoke reacting with the ozone is avoided; and meanwhile, the desulphurization and denitrogenation efficiencies of the process are high.

Description

technical field [0001] The invention relates to a reaction device, in particular to a coke oven flue gas desulfurization and denitrification mixed reaction device and a flue gas desulfurization and denitrification integrated process. Background technique [0002] The coke oven flue gas is the product of the combustion of the coke oven heating system. Due to the difference in furnace type, coke oven fuel and coke oven load, the flue gas temperature of the coke oven flue gas is between 230 and 300 °C, and the flue gas contains a large amount of thermal energy. At the same time, coke oven flue gas contains a large amount of NO x and SO 2 , NO x The content is 600~1200mg / Nm 3 Between; SO 2 The content is generally 60~150mg / Nm 3 , for enterprises with relatively high organic sulfur content in raw coal, the SO in coke oven flue gas 2 Content up to 350mg / Nm 3 , far exceeding the standard emission limits. With the implementation of the "Emission Standard of Air Pollutants f...

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Problems solved by technology

However, according to the research, the decomposition rate of ozone is not high at 150°C, but when the temperature is higher than 200°C, the decomposition rate increases significantly.

In the prior art, the temperature of flue gas after waste heat recovery is generally 180-220°C. Therefore, if ozone is passed into the flue gas after waste heat recovery for reaction, part of the ozone will be decomposed, thereby affecting the efficiency of desulfurization and denitrification.

At the same time, in the prior art, after desulfurization and denitrification of the flue gas recovered by waste heat, the flue gas with a higher temperature is directly discharged, and the waste heat of the flue gas is not fully utilized, resulting in a waste of resources

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