Low-temperature condensing vapour recovery unit

Abstract

The invention relates to a cooled oil gas recovery apparatus under low temperature, which is characterized in that a valve is connected with an inlet pipe of an oil-gas separator; the upper outlet of the oil-gas separator is connected with an inlet of a condenser; the lower outlet is connected with a main recovery tank; the outlet of the condenser is connected with the main recovery tank; the outlet of the condenser is connected with the inlet of a low-temperature tower through a bend pipeline; the upper outlet of the low-temperature tower is connected with the inlet of an active carbon absorber; the outlet of the active carbon absorber is connected with a discharge pipeline through a blower; the lower outlet of the low-temperature tower is connected with the main recovery tank through a valve; an oil-gas mixing pump is connected with a pipeline parallel connected with the inlet pipeline of the oil-gas separator; an oil absorbing pump is connected with the pipeline parallel connected with the pipeline connecting the outlet of the condenser and the main recovery tank; a flame arrester and a nitrogen pipeline are respectively connected with a discharge pipeline; the nitrogen pipeline is connected with the inlet of the active carbon absorber. The cooled oil gas recovery apparatus has the advantages of low cost, stable operation, convenient repair, exhaust gas emission within the prescribed standard, and environmental protective effect.

Description

technical field [0001] The invention relates to a separation device, which is a low-temperature condensed oil gas recovery device. Background technique [0002] During the production, storage, transportation, sale and use of gasoline and other light oil products, due to the influence of temperature, air pressure, changes in the volume of the gas-liquid phase of the oil container and other factors, some oil and gas will volatilize, and the volatilized oil and gas will directly Escaping into the atmosphere and causing oil and gas loss. This not only brings economic loss, but also causes pollution to the atmospheric environment. There is still a danger of flash explosion in thunderstorm weather, and there is a potential safety hazard. [0003] The existing oil and gas recovery mainly has the following three forms: one is the membrane separation device used in the membrane separation method. Due to the limitation of the permeation rate of oil and gas molecules in the membrane, ...

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Problems solved by technology

[0002] During the production, storage, transportation, sale and use of gasoline and other light oil products, due to the influence of temperature, air pressure, changes in the volume of the gas-liquid phase of the oil container and other factors, some oil and gas will volatilize, and the volatilized oil and gas will directly Escaping into the atmosphere and causing oil and gas loss

This not only brings economic losses, but also causes pollution to the atmospheric environment. There is still a danger of flash explosion in thunderstorm weather, and there is a potential safety hazard.

[0003] The existing oil and gas recovery mainly has the following three forms: one is the membrane separation device used in the membrane separation method. Due to the limitation of the permeation rate of oil and gas molecules in the membrane, if the oil and gas recovery capacity suitable for use is achieved, the number of membrane groups must be increased. Or increase the pressure difference between the front and rear ends of the membrane, increasing the number of membrane groups will increase the cost, and increasing the pressure difference will increase the energy consumption of the equipment; the other is the activated carbon adsorption device used in the activated carbon adsorption method. The activated carbon has a short service life and frequent operations. Recycling The scale is limited by adsorption and desorption, especially in the working conditions where the concentration of oil and gas changes greatly or the flow rate changes, the device often has problems such as low efficiency or excessive load. The device has unreasonable structure, large floor space and high cost.

To sum up the shortcomings of each of the three forms mentioned above, it is difficult for any single device to meet the requirements of my country's "Emission Standard of Air Pollutants for Oil Storage Depots" (GB20950-2007) for oil storage depots (including refinery oil distribution platforms). Carry out oil and gas emission control and recovery, and the oil and gas emission concentration shall not exceed 25g / m 3 , the oil and gas treatment efficiency is not lower than the specified requirement of 95%

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