High-pressure cryogenic combined VOCs gas recovery device and recovery method

Abstract

A high-pressure cryogenic combined VOCs gas recovery device comprises a buffer tank, a compressor unit and a heat exchange mechanism, the inlet end of the buffer tank is communicated with an external VOCs gas collection pipeline, the inlet end of the compressor unit is communicated with the outlet end of the buffer tank through a gas filter, the outlet end of the compressor unit is communicated with a gas-liquid separator. The gas phase outlet end of the gas-liquid separator is communicated with a liquid remover; the heat exchange mechanism comprises a pre-heat exchanger and four stages of heat exchangers which are sequentially connected in series, the heat inlet end of the pre-heat exchanger is communicated with the outlet end of the liquid remover, the heat outlet end of the pre-heat exchanger is communicated with the heat inlet ends of the four stages of heat exchangers, and the heat outlet ends of the four stages of heat exchangers are communicated with the cold inlet end of the pre-heat exchanger; and the cold inlet ends and the cold outlet ends of the four stages of heat exchangers are respectively communicated with low-temperature refrigerants under different design temperature conditions. The device is high in safety, environment-friendly and energy-saving, and can perform stable standard treatment on the VOCs gas.

Description

technical field [0001] The invention relates to the technical field of VOCs gas recovery, in particular to a high-pressure cryogenic combined VOCs gas recovery device, and also relates to a recovery method of the high-pressure cryogenic combined VOCs gas recovery device. Background technique [0002] As the country intensifies efforts to rectify environmental protection, various norms and standards have been improved, especially after the official release and implementation of GB 31570 / 1 / 2-2015, the domestic VOCs gas treatment standard has moved from the gram level to the milligram level standard, and the industry Many atmospheric control companies in China have carried out in-depth optimization of the original process design process, and have also carried out many project practices. [0003] The actual feedback over the past few years has proved that the current process treatment process is not enough to deal with the VOCs industry. There are very few cases that have reache...

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Problems solved by technology

[0003] The actual feedback over the past few years has proved that the current process treatment process is not enough to deal with the VOCs industry. There are very few cases that have reached the national standard stably. There are many problems in the process equipment, such as the phenomenon of small horse-drawn carts, frequent failures, With the promulgation of local standards and the formulation of internal environmental protection regulations of central enterprises, the requirements for the concentration of exhaust emissions are becoming increasingly strict

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