Efficient multistage throttling LNG device and method for producing LNG

A natural gas and high-efficiency technology, which is applied in the field of high-efficiency multi-stage throttling natural gas liquefaction equipment and the preparation of liquefied natural gas, can solve the problems of low utilization rate of refrigeration cycle cooling capacity, complex structure, and high entropy loss of compressors, so as to improve the utilization of cooling capacity. efficiency, improve liquefaction efficiency, and improve the effect of shaft power

Active Publication Date: 2014-03-26
LIAONING CIMC HASHENLENG GAS LIQUEFACTION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It fundamentally solves the problems of the existing natural gas liquefaction equipment, such as low utilization rate of cooling capacity in the refrigeration cycle, high entropy loss of the compressor, and complex structure.

Method used

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  • Efficient multistage throttling LNG device and method for producing LNG
  • Efficient multistage throttling LNG device and method for producing LNG

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] according to Figure 1~2 The specific structure of the present invention will be described in detail. The high-efficiency multi-stage throttling natural gas liquefaction equipment includes natural gas feed pipes, LNG storage tanks, refrigerant compressors, refrigerant separation tanks, and cold boxes. Among them, the cold box is provided with a main heat exchanger 1 and a secondary heat exchanger 2, and the natural gas feed pipe passes through the main heat exchanger 1 and the secondary heat exchanger 2 in turn and is connected with the feed port of the LNG storage tank 9, and the secondary heat exchanger A fourth throttle valve 13 is provided between the heater and the LNG storage tank 9 .

[0022] There are five refrigerant separation tanks, the outlet of the refrigerant compressor 7 is connected to the feed port of the fifth refrigerant separation tank 8, and the gas phase outlet of the fifth refrigerant separation tank 8 is connected to the feed of the second refri...

Embodiment 2

[0036] The equipment structure and preparation process are the same as in Example 1, wherein the molar content of each component in the refrigerant is: 15% nitrogen, 30% methane, 30% ethylene, 10% propane, and 15% isopentane.

Embodiment 3

[0038] The equipment structure and preparation process are the same as in Example 1, wherein the molar content of each component in the refrigerant is: 20% nitrogen, 25% methane, 25% ethylene, 15% propane, and 10% isopentane.

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Abstract

An efficient multistage throttling LNG device comprises a natural gas inlet pipe, an LNG storage tank, a refrigerant compressor, refrigerant separation tanks and a cold cabinet. The efficient multistage throttling LNG device is characterized in that a main heat exchanger and an auxiliary heat exchanger are arranged in the cold cabinet, the natural gas inlet pipe sequentially passes through the main heat exchanger and the auxiliary heat exchanger and then is connected with a feed inlet of the LNG storage tank, a fourth throttling valve is arranged between the auxiliary heat exchanger and the LNG storage tank, and the number of the refrigerant separation tanks is five. Cooling capacity needed by supply is achieved in a segmented mode, entropy production of the liquidation process is minimized, and efficiency approximates step-type circulation. The problems that an existing LNG device is low in utilization rate of refrigeration cycle cooling capacity, high in entropy loss of a compressor, complex in structure and the like are solved fundamentally.

Description

technical field [0001] The invention relates to the technical field of gas liquefaction systems, in particular to a high-efficiency multi-stage throttling natural gas liquefaction equipment and a preparation method for liquefied natural gas. Background technique [0002] In recent years, domestic and imported natural gas liquefaction plants have a daily liquefaction capacity of about 100 million cubic meters. Reducing the energy consumption of natural gas liquefaction, storage, and vaporization is the most important part of designing and building natural gas liquefaction plants. High-efficiency multi-stage throttling natural gas liquefaction plant is the development trend of high-efficiency and energy-saving natural gas liquefaction system. Recently, the natural gas liquefaction plant usually adopts the mixed refrigerant cycle (MRC) process, which mainly uses N 2 A mixture of C1~C5 hydrocarbons is used as a circulating refrigerant. The composition ratio of mixed refrigeran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
Inventor 杨光达邢志辉孟繁宇
Owner LIAONING CIMC HASHENLENG GAS LIQUEFACTION EQUIP CO LTD
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