An emergency nitrogen charging system and control method for CDQ coke oven

Abstract

The invention discloses an emergency nitrogen charging system and control method for CDQ coke ovens, belonging to the field of CDQ coke oven gas detection; including CDQ coke ovens, gas circulation detection devices, nitrogen supply devices and CDQ control station DCS; control The method includes the following steps: judging whether the concentration of combustible gas exceeds the standard; in the case of exceeding the standard, controlling the opening of the air regulating valve according to the gas temperature; judging the degree of exceeding the standard, starting an emergency nitrogen filling system; judging whether to start an emergency investigation program; Judging the changing speed of the concentration; when the concentration increases rapidly, start the emergency nitrogen filling system; when the changing speed of the concentration is stable, close the nitrogen regulating valve; judge the nitrogen pressure of the nitrogen buffer tank, adjust the nitrogen regulating valve of the pipe network and the spare nitrogen regulating valve The opening degree ensures sufficient supply of nitrogen for accidents. The invention realizes that nitrogen gas is charged in advance during the rising period of the combustible gas concentration to prevent the concentration from exceeding the standard, and after the concentration exceeds the standard, nitrogen charging is automatically adjusted to CDQ coke ovens in stages.

Description

technical field [0001] The invention relates to the field of CDQ coke oven gas detection, in particular to an emergency nitrogen charging system and control method for CDQ coke ovens. Background technique [0002] The inert circulating gas exchanges heat with the coke countercurrently in the cooling section of the CDQ furnace, and enters the CDQ boiler after the temperature rises to 900-960°C. Because a small amount of air will leak into the negative pressure section of the gas circulation system, 2 Passing through the red coke layer will react with coke to generate CO 2 , CO 2 In the high-temperature zone of the coke layer, it will be reduced to CO again. With the increase of the number of cycles, the concentration of CO in the cycle gas will become higher and higher. In addition, the residual volatile matter of coke is being precipitated, and the H produced by pyrolysis of coke 2 , CO, etc. are also flammable and explosive components. Therefore, during CDQ operation, t...

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Problems solved by technology

However, both of these two measures need to manually adjust the valve according to the gas concentration, and both of them are adjusted after the combustible gas concentration is abnormal, which has certain risks.

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