Closed collection system for overflow sewage of flare water seal tank

Abstract

The invention relates to a closed collection system for overflow sewage of a flare water seal tank. U-shaped overflow pipes of water seal tanks of all drainage systems are connected to a buried sewagetank, a vacuum breaking pipe arranged at a high point of each U-shaped overflow pipe is connected to an outlet pipe of the corresponding water seal tank, and a gas-phase balance pipe of the sewage tank is connected to a water seal tank outlet pipe or the water seal tank of the designated drainage system. When combustible gas is exhausted into the drainage system, the back pressure generated by gas flow is transferred to the sewage tank through the gas-phase balance pipe, the sewage in the tank is pressed into the overflow pipes of other water seal tanks. Due to the fact that the elevation difference between the inner surface of the lower part of a pipe at the high point of the U-shaped overflow pipe of each water seal tank and the highest liquid level of the sewage tank is larger than theheight of the liquid column corresponding to the back pressure of the drainage system under the design discharge amount, the overflow of the water seal tanks of other drainage systems is not affected. The U-shaped overflow pipes have no water seal height requirement, no water seal well needs to be arranged, and closed collection of overflow sewage is achieved without additionally arranging a VOCtreatment device.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to equipment for collecting torch waste liquid, in particular to a closed collection system for the overflow sewage of a torch water-sealed tank. Background technique [0002] The torch system is an important safety and environmental protection facility for petrochemical enterprises. It is used to treat the flammable gas emitted by various process devices and auxiliary facilities when they are shut down and accidents. Non-combustible substances that meet relevant environmental protection requirements. [0003] The water-sealed tank is a liquid (usually water) isolation facility that is used to prevent air from infiltrating into the flammable gas discharge system to cause an explosion, or to divert flow, or to establish a back pressure for the discharge system. important parts of. [0004] The overflow and sewage collection system of the water seal tank plays a very ...

AI Technical Summary

Problems solved by technology

However, the system still requires the height of the water seal, resulting in the need to set up a water seal well, which increases the project cost and increases the difficulty of operation and maintenance of the water seal pipe

In addition, the system is an open collection system, which does not meet the requirements of the existing environmental protection regulations on VOC fugitive emissions

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