Waste heat utilization and circulating refrigeration device of mixed refrigerant compressor unit

Abstract

The invention discloses a waste heat utilization and circulating refrigeration device of a mixed refrigerant compressor unit. The waste heat utilization and circulating refrigeration device of the mixed refrigerant compressor unit comprises a high temperature refrigerant cooling module, a heat energy recycling module, a raw material gas cooling module and a high pressure refrigerant cooling module. The high temperature refrigerant cooling module is used for cooling mixed refrigerant with medium temperature hot water and outputting normal temperature high pressure refrigerant. The heat energy recycling module is used for recycling heat and outputting chilled water and medium temperature hot water. The raw material gas cooling module is used for inputting raw material gas and the chilled water and conducting heat exchange cooling on the raw material gas. The high pressure refrigerant cooling module is used for conducting heat exchange cooling on the chilled water and the normal temperature high pressure gaseous phase refrigerant to obtain a refrigerated high pressure refrigerant, conducting coldness balance and then outputting liquefied natural gas. By means of effective coldness andheat conversion and matching, the waste heat utilization and circulating refrigeration device of the mixed refrigerant compressor unit can effectively recycle high-grade part in waste heat of technology gas and greatly lower the compression power consumption of a liquefying device and the adsorption regeneration energy consumption of a molecular sieve system, and the energy efficiency of the device is improved.

Description

technical field [0001] The invention belongs to the fields of natural gas liquefaction and coke oven gas cryogenic separation, and in particular relates to a waste heat utilization and circulation refrigeration device of a mixed refrigerant compressor unit. Background technique [0002] In recent years, excessive coal consumption has led to increasingly serious environmental pollution. The use of clean energy such as natural gas to gradually replace coal is one of the powerful measures to improve environmental quality. After entering 2017, driven by the national top-down "coal-to-gas" policy, domestic natural gas consumption has increased significantly, reaching 280.3 billion m in 2018 3 . LNG (liquefied natural gas) is an effective supplement to natural gas. In the production process, raw materials such as coke oven gas, coal bed methane, and natural gas need to be fully purified, cyclically refrigerated and separated to produce LNG products. [0003] In the LNG productio...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a waste heat utilization and circulation refrigeration device of a mixed refrigerant compressor unit to solve the problems of resource waste and serious energy loss in the LNG production process in the prior art

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