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A method and device for preparing liquefied natural gas by secondary refrigeration of mixed refrigerant

A technology of liquefied natural gas and mixed refrigerant, which is applied in the liquefaction field of natural gas, chemical industry, coalbed methane or other methane-rich gas, can solve the problems of increasing system energy consumption, increasing device complexity, leakage of mixed refrigerant, etc. The effect of heat exchange efficiency, temperature reduction and energy consumption reduction

Active Publication Date: 2016-08-24
CHENGDU SEPMEM SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to: for existing devices using mixed refrigerant liquefied natural gas, a gas-liquid separator and a refrigerant pump need to be installed at the outlet of the compressor, which not only increases the complexity of the device, increases the energy consumption of the system, but also The problem that may cause the leakage of mixed refrigerant provides a method and device for preparing liquefied natural gas by secondary refrigeration of mixed refrigerant

Method used

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  • A method and device for preparing liquefied natural gas by secondary refrigeration of mixed refrigerant
  • A method and device for preparing liquefied natural gas by secondary refrigeration of mixed refrigerant

Examples

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Embodiment 1

[0036] As shown in the figure, the device of this embodiment includes a natural gas liquefaction system and a refrigeration cycle system.

[0037] The refrigeration cycle system consists of a buffer tank, a primary compressor, a primary cooler, a primary gas-liquid separator, a secondary compressor, a secondary cooler, a secondary gas-liquid separator, the first cold box, and the second cold box , the third throttle valve, the second cold box, and the first cold box are connected in sequence through pipelines to form a circulation loop. The primary gas-liquid separator is connected with the first cold box through pipelines, and is merged into the circulation loop through pipelines after passing through the first throttling valve. After passing through the second throttle valve, the secondary gas-liquid separator is directly connected with the primary gas-liquid separator through pipelines.

[0038] The first cold box, the heavy hydrocarbon separator, the second cold box, and ...

Embodiment 2

[0044] As shown in the figure, the device of this embodiment includes a natural gas liquefaction system and a refrigeration cycle system.

[0045] The refrigeration cycle system consists of a buffer tank, a primary compressor, a primary cooler, a primary gas-liquid separator, a secondary compressor, a secondary cooler, a secondary gas-liquid separator, the first cold box, and the second cold box , the third throttle valve, the second cold box, and the first cold box are connected in sequence through pipelines to form a circulation loop. The primary gas-liquid separator passes through the plate-fin heat exchanger, connects with the first cold box through pipelines, and merges into the circulation loop through pipelines after passing through the first throttle valve. The secondary gas-liquid separator passes through the second throttle valve and the plate-fin heat exchanger in turn, and is connected to the primary gas-liquid separator through pipelines.

[0046] The first cold ...

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Abstract

The invention discloses a method and device for preparing liquefied natural gas by secondary refrigeration with mixed refrigerants, and aims to solve the problem that existing devices using mixed refrigerants for liquefied natural gas need to install a gas-liquid separator and a refrigerant pump at the outlet of the compressor. The complexity of the device is increased, the energy consumption of the system is increased, and the problem of leakage of the mixed refrigerant may be caused. The method includes the following steps: the raw natural gas is exchanged through the first cold box to reduce the temperature of the raw natural gas to -50°C , and then through the second cold box for heat exchange, the temperature of the raw natural gas is reduced to -162°C, the raw natural gas is liquefied into LNG, and then sent to storage after being depressurized by the natural gas throttle valve. The invention changes the process flow of mixed refrigerant liquefied natural gas, cancels the refrigerant pump, effectively reduces energy consumption, eliminates the hidden danger of mixed refrigerant leakage, simplifies the process flow and operation, and saves equipment investment.

Description

technical field [0001] The invention relates to the field of chemical industry, especially the technical field of liquefaction of natural gas, coal bed methane or other methane-rich gases, and specifically relates to a method and device for preparing liquefied natural gas through secondary refrigeration of mixed refrigerants. Background technique [0002] As a clean energy source, liquefied natural gas has the characteristics of colorless, odorless, non-toxic and non-corrosive, and its volume is about 1 / 625 of the volume of the same amount of gaseous natural gas. It has been widely used in industrial, civil, automobile fuel and other fields . Many areas without natural gas resources are ready to use liquefied natural gas to solve industrial, civil, and vehicle fuel problems. Therefore, the liquefaction of natural gas has become a concern of people. [0003] The liquefaction of natural gas mainly uses mixed refrigerants or pure single-component refrigerants for refrigeration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J1/02
CPCF25J1/0022F25J1/0055F25J1/0212F25J1/0265F25J2220/64
Inventor 张惊涛母斌
Owner CHENGDU SEPMEM SCI & TECH