A tank constant pressure control system

Abstract

The invention discloses a tank constant pressure control system, which comprises a tank, a nitrogen supply component and a water-sealed fire-retardant tank. , the interior of the water-sealing fire-retardant tank is provided with an upper water-sealing layer and a lower water-sealing layer, the top of the gas connection pipe extends to the top surface of the upper water-sealing layer, and the top of the gas connection pipe is used for supplying nitrogen with the exhaust end of the tank and the nitrogen supply component. The pipeline is connected, and the upper water sealing layer is used to communicate with the emergency negative pressure pipeline, the bottom end of the gas connection pipe extends into the lower water sealing layer, and the bottom end of the gas connection pipe is used to communicate with the VOCs collection pipe. In the tank constant pressure control system disclosed in the present application, a water-sealed fire-retardant tank is arranged at the exhaust end of the tank, and the water-sealing layer under the water-sealed fire-retardant tank is used to control the internal pressure of the tank to be constant when the tank is drained. When the water seal layer and emergency negative pressure pipeline control system fails, the internal pressure of the tank can effectively ensure the pressure stability of the closed tank and improve the safety of the closed tank.

Description

technical field [0001] The invention relates to the technical field of metallurgical equipment, in particular to a tank constant pressure control system. Background technique [0002] The chemical closed tank is affected by the incoming and outgoing materials, and the gas volatilized from the internal medium may be discharged or inhaled. When the tank is a flammable, explosive, and volatile medium, the internal exhaust gas is at risk of explosion in case of fire or high temperature. The VOC gas generated due to such media is extremely difficult to dispose of. [0003] At present, the most ideal method is to carry out collection and post-combustion treatment. The existing VOCs gas collection device is generally a closed tank. When the closed tank is a flammable, explosive and volatile medium, the internal exhaust gas will have a fire or high temperature. Risk of explosion. Therefore, this VOCs gas collection method poses a severe test for the safety of closed tanks. It is di...

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Problems solved by technology

[0003] At present, the most ideal way is to carry out collection and post-combustion treatment. The existing VOCs gas collection device is generally a closed tank. Explosion risk, therefore, this method of VOCs gas collection poses a severe test for the safety of closed tanks. It is difficult to ensure the safety of closed tanks by using the general control method of breathing valves in the past. At the same time, for extremely volatile liquids Generally speaking, the breathing valve control accelerates the volatilization of the liquid due to large pressure fluctuations, which wastes materials and also brings certain difficulties to subsequent processing.

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