Natural gas pressure energy utilization device based on CO2 refrigerants

Abstract

The invention provides a natural gas pressure energy utilization device based on CO2 refrigerants. The device comprises a natural gas expansion power generation system, a CO2 refrigerant circulation refrigeration system and a polarization instrument control system; on the basis of an existing mature natural gas power generation technology, power balance is achieved through an expander-power generator-compressor coupling, CO2 safety refrigerants are selected to serve as heat exchange media of low-temperature natural gas obtained after pressure regulation, according to needs of a downstream market, a certain amount of cold water is produced to serve as a cold source of a cold water air conditioner, and the cold source is provided for the technology with industrial or food ice, dry ice making and other different temperature position requirements. A novel natural gas pipe network pressure energy utilization technology and device which are good in safety performance, intelligent and high in efficiency are provided, the cold amount utilization temperature position of the natural gas pressure energy is further widened, and effective recycling of natural gas pipe network pressure energy is achieved.

Description

technical field [0001] The present invention relates to a CO 2 Refrigerants are used in the production process and devices in the field of low temperature, specifically related to a CO-based 2 Refrigerant natural gas pressure can use the device. Background technique [0002] At present, there are two main ways to recycle the pressure energy of the natural gas pipeline network at home and abroad: power generation and refrigeration. The pressure energy is used to generate electricity, and the generated electricity can enter the urban power grid, or be used for the power station's own life, production, or distributed. Hydrogen production. Refrigeration methods mainly include cold water air conditioning, air separation, cold storage, rubber crushing, liquefied carbon dioxide and dry ice preparation, etc. [0003] Chinese invention patent application CN201310347177 discloses a small-scale natural gas pipeline network pressure energy generation process and device, and proposes ...

AI Technical Summary

Problems solved by technology

Compared with the refrigerants commonly used in natural gas pressure, such as R404A, hydrocarbons, ethanol, etc., CO 2 It has the characteristics of excellent environment, low self-cost, good chemical stability, good safety performance, and large heat transfer latent heat, but CO 2 As a refrigerant, it also has its own disadvantages. The most important thing is that the high temperature of the triple point limits its application as a refrigerant, and it is prone to freeze blockage in low temperature applications.

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