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Natural gas liquefaction process with lithium bromide precooling

A natural gas, lithium bromide technology, applied in the petroleum industry, gas fuel, fuel and other directions, can solve the problems of harmful Freon environment, poor reliability of compressors, complex forms, etc., to save plant investment, low operating costs, and stable and reliable equipment. Effect

Inactive Publication Date: 2010-08-18
哈尔滨深冷气体液化设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the most widely used pre-cooling method is propane or freon pre-cooling, of which propane pre-cooling is more complex and more equipment than freon pre-cooling process; dangerous

Method used

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  • Natural gas liquefaction process with lithium bromide precooling
  • Natural gas liquefaction process with lithium bromide precooling

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Embodiment 1

[0020] The process of natural gas liquefaction with lithium bromide pre-cooling is as follows: the chiller uses lithium bromide as the absorbent, and uses the principle of steam absorption to make refrigerant water at 5-7°C, and the refrigerant water is input through the pipeline for pre-cooling and heat exchange The device pre-cools the natural gas and the mixed refrigerant from the refrigerant compressor to 9-11°C, and the refrigerant water temperature rises by 4-6°C and returns to the lithium bromide chiller for the next cycle. The pre-cooled natural gas and mixed refrigerant The refrigerants are respectively input into the liquefaction cold box through pipelines, the natural gas becomes liquefied natural gas and is output through the pipelines, and the mixed refrigerant enters the refrigerant compressor through pipelines after cooling down from the cold box.

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Abstract

The invention relates to a natural gas liquefaction process with lithium bromide precooling. At present, the precooling mode frequently applied to natural gas liquefaction is a propane or Freon precooling mode, wherein the propane precooling mode has more complicated process form and more equipment than those of the Freon precooling mode; and a Freon compressor used in a Freon precooling process has poor reliability, and circulated precooling agent Freon is harmful to environment. The invention comprises the following steps of: preparing lithium bromide used as an absorbent in a cold water machine set into cooling medium water with the temperature of 5-7 DEG C by utilizing the principle of steam absorption; importing the cooling medium water into a precooling heat exchanger through a pipeline for precooling natural gas and a mixed refrigerant coming out of a refrigerant compressor to 9-11 DEG C, returning the cooling medium water heated to 4-6 DEG C to a lithium bromide cold water machine set for next-time circulation, respectively importing the precooled natural gas and the mixed refrigerant to a liquefaction ice tank through the pipeline, then changing the natural gas to liquefied natural gas to be outputted by the pipeline, and making the mixed refrigerant enter the refrigerant compressor through the pipeline after being cooled through the ice tank. The method of the invention is used for natural gas liquefaction.

Description

Technical field: [0001] The invention relates to a natural gas liquefaction process with lithium bromide precooling. Background technique: [0002] Natural gas is an important energy source, and it is called clean energy because of its low environmental pollution. The volume of liquefied natural gas (LNG) is only 1 / 625 of the volume of the same amount of gas, so after it is liquefied, it can reduce storage and transportation costs, and can increase the fuel value per unit volume. Since the last century, various types of natural gas liquefaction processes have been applied, and the refrigeration methods are divided into the following three methods: 1. Cascade liquefaction process; 2. Mixed refrigerant liquefaction process; 3. Liquefaction with expander process. With the rapid development of the natural gas liquefaction industry, this puts forward higher requirements for natural gas liquefaction technology, so the choice of liquefaction process directly affects the economics...

Claims

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Application Information

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IPC IPC(8): C10L3/10
Inventor 赵德泉杨光达于艳君
Owner 哈尔滨深冷气体液化设备有限公司
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