Multi-temperature refrigeration house system using natural gas pipe network pressure energy and working method thereof

Abstract

The invention relates to a multi-temperature refrigeration house system using natural gas pipe network pressure energy and a working method thereof. The system comprises an expander; the expander is coaxially connected with a generator; an outlet of the expander is connected with natural gas inlets of a freezing chamber heat exchanger, a low-temperature refrigerating chamber heat exchanger, a cooling chamber heat exchanger and a high-temperature refrigerating chamber heat exchanger; natural gas outlets of the freezing chamber heat exchanger, the low-temperature refrigerating chamber heat exchanger, the cooling chamber heat exchanger and the high-temperature refrigerating chamber heat exchanger are connected with a natural gas pressure adjuster and a second natural gas heater through pipes;and refrigerant sides of all the heat exchangers are connected with a cold circulating pump, a refrigerating coil and a refrigerant tank through pipes end to end in sequence. Through reasonable utilization of the natural gas pipe network pressure energy, the refrigeration house system realizes energy-conservation and low-consumption operation, improves the utilization efficiency of natural gas, saves a lot of electric energy, and achieves greater economical benefit and ecological benefit.

Description

technical field [0001] The invention relates to a multi-storey temperature cold storage, in particular to a multi-storey temperature cold storage system utilizing the pressure energy of a natural gas pipeline network and a working method thereof. Background technique [0002] Natural gas is an important clean energy with a wide range of uses and a large demand. Since the 1990s, the proportion of natural gas in the energy structure of various countries has been increasing, and the exploitation and utilization of natural gas in my country have also been increasing. [0003] In order to ensure the smooth progress of the gas transmission process, the natural gas transmission pipeline mainly adopts high-pressure gas transmission, and the high-pressure natural gas transported by the high-pressure gas transmission trunk line must pass through the pressure regulating station at the natural gas receiving gate station of each city according to the gas supply of downstream users The p...

AI Technical Summary

Problems solved by technology

Although this invention recovers the pressure energy of natural gas and the cold energy after doing work, the refrigerant used is a phase-change refrigerant, which becomes gaseous after absorbing heat in the evaporator, and then needs to be compressed by a compressor and then compressed in a condenser. It needs to exchange heat with low-temperature natural gas to become a liquid. In this process, the compressor needs to consume electric energy, which reduces the economical efficiency of the cold storage operation.

In addition, the temperature of the natural gas after heat exchange in this invention is -8°C, and then it is sent to the urban low-pressure pipe network after being heated by a reheater, resulting in a waste of cold energy

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