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Natural gas concentrated transportation system based on cold energy circulation and concentrated transportation method

A natural gas and cold energy technology, which is applied in the field of natural gas collection and transportation systems, can solve the problems of uneconomical natural gas resource pipeline transportation, and achieve the effects of avoiding discharge losses, improving recycling efficiency, and reducing energy consumption.

Pending Publication Date: 2019-10-11
舒伟 +2
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  • Description
  • Claims
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Problems solved by technology

The cold energy cycle-based natural gas collection and transportation system and method of the present invention are used for the recovery, storage and transportation of natural gas resources that are not suitable for pipeline transportation, such as distributed onshore and offshore oilfield associated gas, coalbed methane, shale gas, low-yield gas wells, and biogas. , to solve the problem of uneconomical pipeline transportation of remote marginal and "thin" natural gas resources; when the system and method of the present invention are used for long-distance ocean-going LNG transportation, it not only saves energy but also reduces the risk of environmental pollution

Method used

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  • Natural gas concentrated transportation system based on cold energy circulation and concentrated transportation method

Examples

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Effect test

Embodiment 1

[0029] as attached figure 1 As shown, it is a natural gas collection and transportation system based on cold energy cycle of the present invention, including natural gas liquefaction system, transportation system and LNG cold energy utilization system, the natural gas-LN of purified natural gas in the natural gas liquefaction system 2 After the cold energy obtained in the heat exchanger 2 becomes LNG, it is transported to the LNG cold energy utilization system through the transportation system, and the cold energy of LNG is released to nitrogen, so that nitrogen becomes LN 2 , then LN 2 Natural gas transported to the natural gas liquefaction system through the transportation system-LN 2 In the heat exchanger 2, cold energy is provided for natural gas liquefaction, and the cold energy recovery and utilization process in the natural gas transportation system is realized.

[0030] Further, the natural gas liquefaction system also includes the LNG storage tank 3 for natural gas ...

Embodiment 2

[0038] LNG is usually transported under normal pressure or slightly positive pressure. In the natural gas-LN2 heat exchanger 2 of natural gas resources, the liquefaction pressure of GNG is 0.1MPa at normal pressure, and the corresponding temperature is -162°C. GNG can be liquefied without pressurization Correspondingly, at this time, the gasification pressure of LN2 in the natural gas-LN2 heat exchanger 2 can be 0.4-1.5MPa, and the corresponding gasification temperature is -182°C--163°C, that is, the LN2 gasification pressure is 0.4MPa, and the corresponding temperature is -182 °C; the gasification pressure of LN2 is 1.5MPa, and the corresponding temperature is -163 °C; correspondingly, the temperature of LNG in the liquefaction unit (2) is between -162 °C and -182 °C, which is higher than the freezing point of natural gas -183 °C. The GN2 waste generated by the liquefaction unit (2) is discharged, directly or pressurized to the pressure required by the user, and enters the use...

Embodiment 3

[0040] A natural gas consolidating system based on cold energy circulation of the present invention differs from Embodiment 1 only in that another different LNG cold energy utilization system is used; the LNG cold energy utilization system includes an LNG-argon heat exchanger S2, argon circulation system, air separation tower, natural gas gate station LNG storage tank 5 and natural gas gate station LN2 storage tank 6; the connection loop of LNG-argon heat exchanger S2, argon circulation system and air separation tower is recorded as based on argon Circulating LNG cold energy utilization system, as attached figure 2 shown.

[0041] Further, the argon circulation system includes a series connection composed of liquid argon pipeline S601, circulation argon throttling expansion valve S6, circulation argon heat exchanger, argon pipeline S901, circulation argon compressor S9 and LNG-argon heat exchanger S2 Loop; the circulating argon heat exchanger includes a circulating argon-nit...

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Abstract

The invention relates to a natural gas concentrated transportation system based on cold energy circulation and a concentrated transportation method. Natural gas after being purified is made to acquirecold energy in a natural gas-liquid nitrogen (LN2) heat exchanger in a natural gas liquefying system to become liquefied natural gas (LNG); conveying into an LNG cold energy utilizing system is achieved through a transportation system; cold energy of the LNG is released to nitrogen (GN2), so that the GN2 changes into LN2; then the LN2 is conveyed into the natural gas-LN2 heat exchanger in the natural gas liquefying system through the transportation system; and cold energy is provided for natural gas liquefying, and recycling of the cold energy is achieved. The natural gas concentrated transportation system based on cold energy circulation is used for recycling and storing and transporting of dispersing type land and offshore oilfield associated gas, coal bed gas, shale gas, low-yield gaswells, marsh gas and natural gas resources not suitable for pipeline transportation, and solves the problem that remote boundary and thin and small natural gas resource pipe transportation is not economical; and when the natural gas concentrated transportation system is used for long-distance ocean LNG transportation, energy is saved, and the environmental pollution risk is also lowered.

Description

technical field [0001] The invention belongs to the technical field of natural gas transportation systems, and relates to a natural gas collection and transportation system and a collection and transportation method based on a cold energy cycle. Background technique [0002] my country is a big energy consumer. It is estimated that in the next ten years, the annual consumption of clean energy natural gas will reach more than 300 billion cubic meters. It needs to import a large amount of fuel or raw materials every year, and a considerable part of it will be transported in the form of LNG. In addition, my country is rich in unconventional natural gas resources, such as distributed onshore and offshore oilfield associated gas, coalbed methane, shale gas, low-yield gas wells and biogas, etc. The problem of geographical mismatch does not meet the conditions for large-scale liquefaction or long-distance pipeline transportation, so it can only be released by means of torching. Thi...

Claims

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Application Information

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IPC IPC(8): F25J1/02F25J3/04F17C5/02F17C7/04
CPCF25J1/0022F25J1/0234F25J1/0235F25J1/0262F25J3/04787F17C5/02F17C7/04F25J2215/50F25J2215/42F25J2215/60F17C2221/014F17C2221/033F17C2223/013F17C2223/0161F17C2227/0309F17C2227/0341F17C2227/0365F17C2227/0327F25J2210/42F25J2210/60F25J1/0015F25J1/0223F25J1/0278F25J3/04272F25J3/04278F25J3/044F25J2270/58F25J2270/12F25J2200/72
Inventor 张敏卿毛文军舒伟
Owner 舒伟
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