Method and device for comprehensively utilizing energy of high-pressure natural gas

Abstract

The invention relates to a method and a device for comprehensively utilizing energy of high-pressure natural gas. The method comprises the following steps of: carrying out decarbonization and dehydration on the high-pressure natural gas; reducing a temperature and a pressure of the high-pressure natural gas by turbine expansion; generating electricity by shaft work output by a turbine expansion engine; carrying out cold energy collection on the natural gas subjected to turbine expansion by a heat exchanger, feeding the natural gas subjected to heat exchange by the heat exchanger into an internal combustion engine to generate chemical energy; generating electricity by the chemical energy; and feeding high temperature fume generated by the internal combustion engine into a waste heat boiler to generate steam or hot water. The device comprises a high-pressure natural gas pipeline, a low-pressure natural gas pipeline, a pressure regulator, a valve, the turbine expansion engine, a turbine expansion engine generating set, an internal combustion engine generating set, the heat exchanger, a decarbonization and dehydration mechanism, a frequency converter and the waste heat boiler. The decarbonization and dehydration mechanism is connected with the high-pressure natural gas pipeline and the turbine expansion engine. The turbine expansion engine is connected with a generator and the heat exchanger. The heat exchanger is connected with the low-pressure natural gas transmission and distribution pipeline, thermal fluid and a cold energy pipeline. The internal combustion engine is connected with the generator, the low-pressure natural gas pipeline and the waste heat boiler. Heat energy generated by the waste heat boiler is transferred to thermal equipment. Two types of electric energy are transferred to electric equipment through the frequency converter. The energy utilization rate is improved.

Description

technical field [0001] The invention relates to a method and a device for comprehensive utilization of high-pressure natural gas energy. Background technique [0002] With the completion of the "two horizontal and one vertical" natural gas pipeline arteries, 8 domestic gas field export pipelines, regional pipeline networks for 8 major natural gas consumption markets, and the formulation of development goals for four major regional underground gas storages by 2015 At present, the general concern of the natural gas industry is still the issue of gas transmission capacity building. The huge energy-saving potential contained in long-distance pipelines has not been widely valued. Whether this part of energy can be recycled has important demonstration and practical significance for improving the energy utilization efficiency of my country's natural gas industry. [0003] For long-distance gas pipelines, in order to increase the gas transmission capacity, pressurization stations a...

AI Technical Summary

Problems solved by technology

[0012] The existing equipment for combined power generation using the pressure difference of natural gas transmission and distribution pipelines uses a turboexpander generator set composed of a single turboexpander and a generator, an internal combustion generator set composed of a single internal combustion engine and a generator, and a heat exchanger The constituted equipment recycles the mechanical energy released during the natural gas decompression process and the heat energy generated by the generator set during the power generation process. However, this equipment cannot adapt to the supply pressure of natural gas gate stations and other stations, and the large fluctuations in the consumption of downstream natural gas users at any time, resulting in electric energy. The output pressure, frequency and power are extremely unstable, unable to meet the needs of the power consumer, which limits the practical application of this type of technology

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