Condensation method oil gas recovery method and device

Abstract

The invention discloses a condensation method oil gas recovery method. The method comprises the following steps: (1) providing two deep refrigerators A / C, and providing a pre-condenser B, an oil storage tank and a water storage tank; (2) enabling oil gas to be treated firstly to enter a tube pass of a deep freezer A, flow through the deep freezer A and then enter a tube pass of a pre-condenser B; (3) carrying out gas-liquid separation on the pre-cooled oil gas, enabling the separated gas to enter a tube pass of a deep cooler C , and conducting cooling by a deep cooling secondary refrigerant to realize oil gas condensation; (4) separating out condensate from the condensed oil gas, and treating the purified gas in a next treatment unit; (5) when the deep freezer C needs to be defrosted, switching the oil gas to be treated to enter the tube pass of the deep freezer C, and switching the deep cooling secondary refrigerant of the shell pass of the deep freezer C into a shallow cooling secondary refrigerant; and (6) feeding liquid obtained by defrosting of the deep freezer C into a water storage tank, and enabling pre-condensed gas to sequentially flow through the pre-condenser B and the deep freezer A, so as to achieve oil gas recovery. The method does not have the problem of system ice blockage, and has the advantages of stability, reliability, safety, energy conservation and the like.

Description

technical field [0001] The invention relates to the technical field of environmental protection and energy saving, and relates to an oil gas recovery treatment device, specifically a kind of oil products or chemicals such as gasoline, naphtha, crude oil, jet fuel, aromatic hydrocarbons, alcohols, aldehydes, ketones, ethers, etc. Recovery and processing device for volatile oil and gas. Background technique [0002] During the storage and transportation of oil products and chemicals, a large amount of oil gas or volatile organic compounds (VOCs) escape. According to statistics, the annual loss of light oil products accounts for about 0.5% of light oil products. On the one hand, it leads to a large amount of waste of oil and gas or volatile organic compounds, reducing the economic benefits of enterprises, and on the other hand, it leads to serious environmental pollution. . In addition, since oil and air can easily form explosive mixtures (the lower explosion limit is general...

AI Technical Summary

Problems solved by technology

When activated carbon adsorbs oil and gas components, the adsorption and heat release will cause a large temperature rise in the activated carbon bed, especially when the concentration of oil and gas is high, the activated carbon bed is prone to local overheating, thereby reducing the service life of the adsorbent and making the operation There are safety hazards in the process

In addition, when the oil and gas contain many high-boiling point organic substances, these organic substances are easily adsorbed by activated carbon, but difficult to desorb by vacuum, which will significantly reduce the service life of the adsorbent

[0005] CN1494454A discloses a device that adopts activated carbon adsorption method to recover organic matter. After the adsorption stops, the organic components are desorbed and adsorbed by steam, and then enter the condenser to condense and recover condensed oil and condensed water; the thermal desorption efficiency of steam is high, but the energy consumption is large. The regenerated activated carbon also needs to be cooled and cleaned, which increases the operating cost of the device

CN1522785A discloses a method for recovering oil and gas, which compresses and cools the oil and gas, and absorbs it under pressurized conditions. The disadvantage of this method is that the energy consumption is large, and when the amount of oil and gas to be processed is unstable, especially when the amount of oil and gas fluctuates greatly , the compressor is difficult to operate stably

Mainly rely on condensation liquefaction to recover oil and gas components, the condensation temperature is low, there is crystallization in the condenser, and the crystallization of water and condensed oil need to be removed regularly, so two series of condensers need to be switched; the total energy consumption of the device is relatively large , high failure rate of refrigeration equipment

In addition, crystallization occurs in the subsequent adsorption tank, which significantly reduces the service life of the adsorbent

[0007] At present, the condensation method is mainly used to recover oil and gas in the exhaust of oil loading, and the condensation temperature is -35°C and -75°C, but the following problems mainly exist in the operation of the condensation method oil and gas treatment device: (1) Frosting in the condensation system Seriously, there is ice blockage at the switching valve or pipeline of condensation and defrosting, which makes the condensing system difficult to operate stably; Frost increases the cooling load of the condensing unit, thereby increasing the energy consumption of condensation; using refrigerant hot steam to defrost not only causes the refrigeration system to run stably, increases the configuration of the refrigeration system, but also increases the operating power of the unit

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