Liquid storage tank tail gas treatment system and method

Abstract

The invention relates to the field of gas treatment, in particular to a liquid storage tank tail gas treatment system and method. The liquid storage tank tail gas treatment system comprises a purification unit, a pressure regulating unit, a tail gas treatment unit and a control unit, the purification unit communicates with the top of a liquid storage tank, and the pressure regulating unit comprises a gas extracting device and a gas supplementing device; and the gas extracting device communicates with the purification unit, the gas supplementing device communicates with the top of the liquid storage tank, the tail gas treatment unit comprises a tail gas recovery device and a tail gas incineration device which are arranged in parallel, and the control unit comprises a first controller and a second controller. According to the liquid storage tank tail gas treatment system, the whole-course closed recovery of tail gas at the top of a sulfur-containing sewage tank of a petrochemical refinery plant, the safety control of the liquid storage tank and the recovery of high-value light hydrocarbon are realized, the effect is remarkable effect, and the liquid storage tank tail gas treatment system can be applied and popularized in similar devices in petrochemical industry, coal chemical industry and the like.

Description

technical field [0001] The invention relates to the field of gas treatment, in particular to a liquid storage tank tail gas treatment system and a method thereof. Background technique [0002] The sulfur-containing sewage raw material tank of the refinery sewage stripping unit is generally a vault storage tank. During the operation of the storage tank, due to the large breathing gas generated by the liquid feed, the small breathing gas generated by the temperature rise, and the feed temperature is higher than the material in the tank. The amount of boil-off gas generated by the temperature and the amount of dissolved gas released by the high-pressure feed constitute the tank top tail gas. [0003] According to relevant technical data, the top exhaust gas of sulfur-containing sewage tanks has the characteristics of complex gas composition, large fluctuations in pollutant concentration, and unstable discharge gas volume. For example, a device adopts alkali washing and absorpt...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the unorganized discharge of VOCs from the top of the liquid storage tank to pollute the environment in the prior art, the unstable pressure on the top of the liquid storage tank and the potential safety hazards caused by the high oxygen content in the recovery process of light hydrocarbons. Liquid storage tank tail gas treatment system and method thereof, the system realizes the beneficial effects of whole-process closed recovery of sulfur-containing sewage tank top tail gas in petrochemical refineries, safety control of liquid storage tanks and recovery of high-value light hydrocarbons

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