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Method for utilizing pressure energy of natural gas

A technology of natural gas and pressure energy, applied in compressors, lighting and heating equipment, indirect heat exchangers, etc., can solve problems such as instances where cold energy is not fully utilized, improve energy utilization efficiency, facilitate technology, eliminate The effect of safety hazards

Inactive Publication Date: 2008-08-20
GUANGZHOU GAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no instances where these cold energies are fully utilized

Method used

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  • Method for utilizing pressure energy of natural gas
  • Method for utilizing pressure energy of natural gas
  • Method for utilizing pressure energy of natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1Shown is a process flow for converting the pressure energy of natural gas into cold energy by using an unpowered refrigerator and using it for users of cold energy at different temperature levels.

[0048] High-pressure natural gas (pressure about 4.0~5.0MPa) and temperature about 15°C is expanded and decompressed to 0.5MPa by the unpowered refrigerator 101, and the temperature drops to -49.3°C~-58.7°C, becoming low-temperature natural gas. In order to recover the cold energy of natural gas for refrigeration in -30°C cold storage, the refrigerant in the cold storage (such as R22, R410A, ammonia, etc.) exchanges heat with low-temperature natural gas in E413 equipment 102, and the refrigerant absorbs cold energy and liquefies, and then The brine pump is transported to the cold storage to evaporate and release cold energy. In order to make full use of the cold energy of low-temperature natural gas, two cold storages with different evaporation temperatures ...

Embodiment 2

[0057] Embodiment 2 (natural gas pressure energy refrigeration is used for dry ice production)

[0058] Dry ice is a solid substance obtained by compressing, purifying, liquefying, and decompressing carbon dioxide gas. The traditional process is to compress the carbon dioxide gas to 2.5-3.0MPa, and then use refrigeration equipment to cool and liquefy it. By using the cold energy of natural gas expansion and refrigeration, it is easy to obtain the low temperature required for cooling and liquefying carbon dioxide, thereby reducing the working pressure of the liquefaction device to about 0.9MPa. Compared with the traditional process, the load of refrigeration equipment is greatly reduced, and the power consumption is also greatly reduced.

[0059] Take Tianxin Natural Gas Pressure Regulating Station in Guangzhou City as an example. The pressure of natural gas received by the pressure regulating station is 3.6-5.2 MPa, the gas source is LNG imported from Australia, and the maxi...

Embodiment 3

[0061] Embodiment 3 (natural gas pressure energy refrigeration is used for cold storage production)

[0062] The temperature of the freezer is usually around -20°C to -30°C; the freezer is used for short-term or long-term storage of cooled and frozen foods at different temperatures in refrigerators and freezers at different temperatures. Basically, multi-stage electric compression refrigeration devices are used to maintain the low temperature of the cold storage. Using the cheap cold energy recovered from high-pressure natural gas instead of electric refrigeration as the cold source of the cold storage can reduce the investment in the compression refrigeration system and generate greater economic benefits.

[0063] High-pressure natural gas (about 5.0 MPa) enters the primary precooler 301, and then enters the ammonia evaporator 302 for secondary heat exchange. The pressure is reduced to about 0.4 MPa in the expansion device 303, and the gas temperature is reduced to -100°C. T...

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Abstract

The invention discloses a method which utilizes natural gas pressure energy; namely, the pressure and the temperature of the natural gas in a high pressure pipeline are reduced by a no-power refrigerator so as to gain low temperature natural gas which then exchanges the heat with a normal-temperature refrigerant which is sent by a normal-temperature tank; the low temperature refrigerant with temperature reduced enters a refrigerant storage tank for standby and is finally delivered to a cold energy user; the normal-temperature natural gas with temperature increased enters the pipeline. The method which utilizes natural gas pressure energy has convenient and practical whole process technique and high efficiency, spends little investment on the self-pressure energy in the pressure reduction process of the high pressure natural gas which is recovered by a pressure modulating station, converts the pressure energy into the cold energy with low operation cost, leads the cold energy to be used by cold quantity users of cold storages, cold water air conditioners, wasted rubber deep-cold crushing round the pressure modulating station by means of the refrigerant, etc., or to be made into ice blocks and dry ice products for abroad sale, etc., thus gaining huge economic benefits, improving the utilization ratio of the energy resource and eliminating the safe hidden trouble which is generated by sudden coolness of the equipment in the normal pressure modulating process.

Description

technical field [0001] The invention relates to the technical field of refrigeration systems, in particular to the technical field of recovering natural gas pressure energy and converting it into cold energy and utilizing it. Background technique [0002] The shortage of energy is increasing day by day, and people put forward the requirement of energy saving and emission reduction. It is undoubtedly a technology that meets this requirement by using the pressure energy lost and discharged to produce cold energy instead of electric refrigeration. One of the basic national policies of our country today is to save energy, and waste heat and waste pressure utilization projects are listed as one of the ten energy-saving projects that my country will focus on during the "Eleventh Five-Year Plan" period. The pressure energy recovery and utilization of high-pressure natural gas belongs to the category of residual pressure utilization, which has a significant energy-saving effect, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B9/06F28D9/00
Inventor 乔武康李静张德坤罗东晓徐文东孔松涛
Owner GUANGZHOU GAS
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