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Stage refrigerating cycle liquefaction process

A refrigeration cycle and cascaded technology, applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of LNG technology starting late, and achieve the effects of reduced risk, reduced surge, and mature technology

Inactive Publication Date: 2012-05-16
袁俊海
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Liquefied natural gas has broad application prospects in the field of urban gas peak regulation, but my country's liquefied natural gas technology started relatively late, and there is still a big gap compared with foreign developed countries

Method used

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Embodiment

[0028] The present invention includes propane cycle process, ethylene cycle process, and methane cycle process.

[0029] Described propane cycle process comprises the following steps;

[0030] (a) The low-pressure propane vapor is compressed by a propane compressor and conventionally cooled by cooling water to achieve full condensation;

[0031] (b) The liquid propane refrigerant is throttled and expanded step by step under different pressures, so that the propane evaporates at different temperatures, so that the propane refrigerant cools the natural gas and the circulating refrigerant step by step in different temperature ranges ;

[0032] (c) The propane vapors at different pressures are returned to the corresponding inlets of the cycle compressor, completing a closed refrigeration cycle for propane.

[0033] The ethylene recycling process comprises the following steps;

[0034] (d) The low-pressure ethylene vapor is compressed by an ethylene compressor, and is convention...

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Abstract

The invention discloses a stage refrigerating cycle liquefaction process, which comprises the propane cycle process, the ethylene cycle process and methane cycle process. The stage refrigerating cycle liquefaction process has low energy consumption; because a nine-stage liquefaction flow is adopted, the refrigeration temperature in each stage approaches a cooling curve of a feed gas, entropy production is decreased, and the energy consumption approaches the theoretical thermodynamic efficiency upper limit; a refrigerant is a pure substance, a proportioning problem is avoided, and the operation is stable; in a cycle, a single refrigerant is adopted and easily keeps the given temperature in the cooling process, and because the components of a cycling medium are always same, a device can quickly start and stop, and the operation is stable; and a technology is mature and the surging of a compressor is reduced; and because the compressor always intakes gas with constant molecular weight, the surging danger of the compressor is reduced.

Description

technical field [0001] The invention relates to a cascade refrigeration cycle liquefaction process. Background technique [0002] The peak-shaving natural gas liquefaction process operates in three stages throughout the year, namely, the liquefaction stage, the backup stage, and the gasification and transportation stage. The period of the liquefaction stage is generally 50-300 days, and the remaining natural gas available in the upstream is liquefied; the liquefied natural gas is stored in the storage tank in the standby stage, and there is no increase or output of liquefied natural gas; the gasification transportation stage gasifies the stored liquefied natural gas and sends it to Natural gas network. [0003] Compared with the base-load LNG plant, the production scale of the peak-shaving LNG plant is small, and its liquefaction capacity is generally about 1 / 10 of the peak load capacity, but its storage and gasification capacity is large. Usually, the gasification capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 袁俊海
Owner 袁俊海
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