Emergency nitrogen charging system for dry quenching furnace and control method

Abstract

The invention discloses an emergency nitrogen charging system for a dry quenching furnace and a control method, belonging to the field of dry quenching furnace gas detection. The emergency nitrogen charging system comprises the dry quenching furnace, a gas circulation detection device, a nitrogen supply device and a dry quenching control station DCS. The control method comprises the following steps: judging whether a combustible gas concentration exceeds a standard or not; under the condition that the combustible gas concentration exceeds the standard, controlling the opening degree of an air regulating valve according to a gas temperature, judging a standard exceeding grade, starting the emergency nitrogen charging system, and judging whether an emergency troubleshooting program is started or not; under the condition that the concentration does not exceed the standard, judging the change speed of the concentration; and under the condition that the concentration is rapidly increased, starting the emergency nitrogen charging system, or under the condition that the concentration change speed is stable, closing the nitrogen regulating valve, judging the nitrogen pressure of a nitrogen buffer tank and adjusting the opening degrees of a pipe network nitrogen adjusting valve and a standby nitrogen adjusting valve so as to guarantee sufficient supply of accident nitrogen. According to the invention, nitrogen is charged in advance in a combustible gas concentration rising period to prevent the concentration from exceeding the standard; and after the concentration exceeds the standard, nitrogen charging adjustment is automatically conducted on the dry quenching furnace in a graded mode.

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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