Method for generating power and making ice by aid of pressure energy of natural gas of pipe network and device

Abstract

The invention discloses a method for generating power and making ice by the aid of pressure energy of natural gas of a pipe network and a device. The method includes steps of (1), throttling the high-pressure natural gas by a throttling valve and expanding the high-pressure natural gas by an expansion machine to generate electric power; (2), realizing heat exchange between the expanded natural gas and refrigerant in a first heat exchanger 4, further realizing heat exchange between the natural gas and refrigerant of a second heat exchanger 5, leading the temperature of the natural gas to rise to a range from 2 DEG C to 10 DEG C after heat exchange processes, and delivering the natural gas into the urban gas pipe network; and (3), delivering one channel of the refrigerant in the second heat exchanger 5 into a refrigerant channel of the first heat exchanger after the heat exchange process, compressing another channel of the refrigerant by a compressor, cooling the other channel of the refrigerant by circulating cooling water, throttling and expanding the other channel of the refrigerant, and then delivering the other channel of the refrigerant and the refrigerant in the first heat exchanger after the heat exchange process together to an ice maker 11 to make ice. The method and the device have the advantages that fuel for heating low-temperature natural gas after pressure of the low-temperature natural gas is regulated is saved, operating cost of a natural gas pressure regulating station is greatly lowered, the electric power is obtained, and simultaneously, a large quantity of industrial or edible ice can be produced.

Description

technical field [0001] The invention relates to the field of utilization of natural gas pressure energy, in particular to a method and device for utilizing the pressure energy of high-pressure natural gas in a high-pressure pipeline network. This process not only saves the fuel used for low-temperature natural gas after heating and pressure regulation, but also greatly reduces the operating cost of natural gas pressure regulating gate stations ; Obtained electric power again, also can produce a large amount of industrial use or food ice simultaneously. Background technique [0002] With the completion of my country's West-to-East Gas Transmission, Sichuan-to-East Gas Transmission, Guangdong LNG Pilot Project for gas supply, and the planning and construction of other large-scale LNG station and line projects along the coast, my country will build a "two horizontal and two vertical" natural gas transmission system by 2015. Gas pipelines, and the natural gas industry will develo...

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Problems solved by technology

Chinese patent CN 101245956A discloses a universal method for utilizing natural gas pressure energy to refrigerate, but this method does not involve power generation. At the same time, the method proposed in this patent is relatively theoretical, and it is only a principled method for the application of pressure energy. Industrial practice Applications are limited

CN 101852529 A discloses a method and device for efficiently utilizing the pressure energy of a natural gas pipeline network. The method involves pressure energy refrigeration for cold storage and cold water air conditioning processes, but the technology does not involve pressure energy power generation process

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