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Gas liquefying and circulating structure

A cycle structure and gas technology, applied in the field of gas liquefaction cycle structure, can solve the problems of high investment cost and operation cost of pretreatment device, and achieve the effects of simple structure, cost reduction and compact system

Active Publication Date: 2010-12-01
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the investment cost and operating cost of the pretreatment device are very high

Method used

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  • Gas liquefying and circulating structure
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  • Gas liquefying and circulating structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: Use the gas liquefaction cycle structure provided by the present invention to liquefy natural gas.

[0038] Such as figure 1 As shown, the gas liquefaction cycle structure in Embodiment 1 includes compressor unit CU, cooler AC, main heat exchanger HX1, latent heat exchanger HX2, first sensible heat exchanger CS1, LNG storage tank FL, main Throttle refrigeration element V1, auxiliary throttle refrigeration element V2, first refrigeration control valve V3, first raw material control valve V5, first regeneration control valve V6 and pipelines; the connection method is: the outlet of the compressor unit CU is connected to the cooler AC inlet and AC outlet of the cooler are connected to the high-pressure inlet of the main heat exchanger HX1, and the high-pressure outlet of the main heat exchanger HX1 is respectively connected to the inlet of the main throttling refrigeration element V1 and the inlet of the auxiliary throttling refrigeration element V2 through a...

Embodiment 2

[0040] Embodiment 2: use the gas liquefaction cycle structure provided by the present invention to liquefy natural gas.

[0041] Such as figure 2 The gas liquefaction circulation structure shown, in addition to the circuits and original components listed in Example 1, also includes a first gas circuit HL1; the first gas circuit HL1 is controlled by the LNG storage tank FL, the first return flow Valve V9, the first sensible heat exchanger CS1 and pipelines; the connection method is: the low-temperature gas in the LNG storage tank FL is connected to the inlet of the first return control valve V9 by the pipeline, and the outlet of the first return control valve V9 is connected to the first The gas return inlet of the sensible heat exchanger CS1, and the gas return outlet of the first sensible heat exchanger CS1 are used as the return gas fuel outlet. When the refrigerator is working, the natural gas is firstly cooled by the first sensible heat exchanger CS1 and further purified...

Embodiment 3

[0042] Embodiment 3: Coal bed gas is liquefied using a gas liquefaction cycle structure provided by the present invention.

[0043] Such as image 3 The gas liquefaction cycle structure shown, in addition to the circuits and components listed in Embodiment 1, also includes a second refrigeration circuit SL2 and a second raw gas pipeline GL2. The second refrigeration circuit SL2 is composed of compressor unit CU, cooler AC, main heat exchanger HX1, auxiliary throttling refrigeration element V2, second refrigeration control valve V4, second sensible heat exchanger CS2 and pipelines ; The connection method is: the outlet of the auxiliary throttling refrigeration element V2 is connected to the inlet of the second refrigeration control valve V4, the outlet of the second refrigeration control valve V4 is connected to the refrigerant inlet of the second sensible heat exchanger CS2, and the second sensible heat exchanger CS2 The outlet of the refrigerant is connected to the inlet of ...

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Abstract

The invention relates to a gas liquefying and circulating structure which comprises a main refrigerating circuit, a first refrigerating circuit and a raw gas pipeline, wherein the main refrigerating circuit is a circuit formed by the connection of a compressor unit, a cooler, a main heat exchanger, a latent heat exchanger, a main throttling and refrigerating element and a pipeline; the first refrigerating circuit is a circuit formed by the connection of a compressor unit, a cooler, a main heat exchanger, an auxiliary throttling and refrigerating element, a first sensible heat exchanger and a pipeline; and the first raw gas pipeline is a circuit formed by the connection of the first sensible heat exchanger, the latent heat exchanger, an LNG storage tank and a pipeline. The gas liquefying and circulating structure is simple, has no absorption tower, regeneration tower or other complicated devices, enables the overall system to be more compact and greatly lowers the cost.

Description

technical field [0001] The invention relates to a gas liquefaction cycle structure. Background technique [0002] The liquefaction of natural gas is a low-temperature process. Impurities in natural gas at low temperatures can easily cause corrosion to liquefaction equipment and block pipelines. Therefore, before liquefaction, natural gas must be pretreated to remove water vapor, carbon dioxide, and hydrogen sulfide. components. Generally speaking, in the treated natural gas, the concentration of water vapor should be less than 0.1ppm, the concentration of carbon dioxide should be less than 50ppm, and the content of hydrogen sulfide should be less than 3.5mg / m 3 . The removal of water and carbon dioxide is the most important link in the pretreatment of natural gas. Traditional removal technology generally adopts physical or chemical adsorption methods, and works in an alternate cycle of multiple sets of devices, and uses heating to achieve adsorbent regeneration. Generall...

Claims

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Application Information

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IPC IPC(8): F25J3/08
CPCF25J1/0022F25J1/004F25J1/0052F25J1/0212F25J1/023F25J1/0265F25J1/0272F25J2210/06
Inventor 吴剑峰公茂琼董学强吴建光刘加永杜木新陈仕林胡勤国
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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