Oil-gas condensing unit with self-defrosting function and oil-gas condensing and recycling method

Abstract

The invention discloses an oil-gas condensing unit with a self-defrosting function and an oil-gas condensing recovery method. The oil-gas condensing unit comprises an oil-gas compressor, two oil condensing chambers / defrosting chambers, a liquid storage tank, a condenser, a refrigeration compressor, a gas-liquid separator, a gear pump, an oil storage tank, an electromagnetic valve and an electronicexpansion valve. The oil-gas compressor is connected with the two oil condensing chambers / defrosting chambers through a first electromagnetic valve and a second electromagnetic valve respectively. According to the oil gas condensation recovery method, an internal and external combined defrosting mode of liquid pipe defrosting and hot gas defrosting is adopted, refrigerant liquid in a liquid storage tank is used for defrosting, and the needed cooling capacity provided by a system is not affected; a frost layer on the surface of a heat exchange coil can be quickly melted through hot air frost blowing, a refrigerant flowing back into the liquid storage tank can also provide a certain degree of supercooling, and the refrigerating capacity is improved. The defrosting effect is better, and thespeed is high; meanwhile, the two oil condensing chambers / defrosting chambers work alternately, and continuous and stable operation of oil gas condensation recovery is achieved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas recovery, and in particular relates to an oil and gas condensing unit with self-defrosting function and an oil and gas condensing recovery method. Background technique [0002] The oil and gas condensing device needs to condense the oil and gas to sub-zero temperature. In many cases, the temperature will be lower, so that the heavy components or high boiling point components (such as water and xylene) in the oil and gas can easily condense on the surface of the heat exchange tube of the condenser to form a frost layer. Defrost treatment is required to maintain the continuous and stable operation of the oil and gas condensing device. Traditional defrosting methods include hot gas bypass defrosting, electric heat tracing defrosting, and heat pump defrosting. The cooling capacity is insufficient due to the drop, the oil and gas condensation effect is not good, and the hot steam causes a large th...

AI Technical Summary

Problems solved by technology

Traditional defrosting methods include hot gas bypass defrosting, electric heat tracing defrosting, and heat pump defrosting. The cooling capacity is insufficient due to the drop, the oil and gas condensation effect is not good, and the hot steam causes a large thermal stress on the heat exchanger and reduces its service life; electric heating defrosting will also cause excessive local thermal stress of the heat exchange tube; heat pump Defrost has a great influence on the continuity and stability of oil and gas condensation

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