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Liquefied natural gas and light hydrocarbon recovery device and method improving yield

A technology for the recovery of liquefied natural gas and light hydrocarbons, which is applied in the directions of liquefaction, refrigeration, liquefaction, and solidification.

Active Publication Date: 2015-04-22
四川科比科油气工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many recovery devices and methods in China that specialize in the recovery of light hydrocarbons from natural gas pipeline gas. These devices and methods only separate and recover light hydrocarbons in pipeline natural gas, and the separated methane and ethane contain a large amount of propane 、C 4 + - Substances such as hydrocarbons, propane, C 4 + - The added value content of hydrocarbons and other substances is relatively high, so the proportion of methane and ethane in the liquefied natural gas is relatively low, and high-purity LNG cannot be obtained, and propane, C 4 + - Liquefaction of hydrocarbons and other substances into LNG

Method used

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  • Liquefied natural gas and light hydrocarbon recovery device and method improving yield
  • Liquefied natural gas and light hydrocarbon recovery device and method improving yield

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Experimental program
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Effect test

Embodiment 1

[0032] This embodiment is the process structure of the first recovery device, such as figure 1 As shown, a recovery device for improving liquefied natural gas and light hydrocarbons, including feed gas inlet pipe 11, cold box 1, methane scrubber 2, liquid hydrocarbon splitter 4, deethanizer 5, reboiler 6, low temperature splitter 7. Cryogenic pump 8, gas-liquid separator 9, refrigeration system 10 and liquefied natural gas outlet pipe 13, feed gas inlet pipe 11 communicates with cold box 1, and cold box 1 communicates with the tower bottom of methane scrubber 2 through pipe three 15; The bottom of the methane scrubber 2 is connected with the liquid hydrocarbon splitter 4 through pipes, the liquid hydrocarbon splitter 4 is connected with the upper half of the deethanizer 5 through the pipe five 17, and the liquid hydrocarbon splitter 4 is connected with the cold box 1 through the pipe four 16 Connected, the upper half of the deethanizer 5 is communicated with the cold box 1 thr...

Embodiment 2

[0046] There are the following differences between the second recovery device process structure of the present embodiment and the first recovery device process structure, and other structures are the same: as figure 2 As shown, the low-temperature splitter 7 and the upper half of the methane scrubber 2 are also communicated through the pipe nine 21, and the recovery device of the embodiment two is provided with the pipe nine 21 with respect to the recovery device of the embodiment one, and other structures are the same. Similarly, in the recovery device of embodiment two, pipe nine 21 is connected between the low-temperature splitter 7 and the upper half of the methane scrubber 2, and the liquid-phase mixed hydrocarbons after the low-temperature splitter 7 splits will form the washing of the methane scrubber 2. liquid, which is the feed gas located in the methane scrubber 2 for scrubbing.

[0047] The second recovery method of this embodiment has the following differences fro...

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Abstract

The invention discloses a liquefied natural gas and light hydrocarbon recovery device and method improving yield. A feed gas inlet pipe is communicated with a cold box which is communicated with the bottom of a methane washing tower through a third pipe. The methane washing tower is communicated with a liquid hydrocarbon divider through a pipe. The liquid hydrocarbon divider is communicated with a deethanizer through a fifth pipe and communicated with the cold box through a fourth pipe. The deethanizer is communicated with the cold box through an eighth pipe and communicated with a low-temperature divider through a seventh pipe. The low-temperature divider is communicated with a gas-liquid separator through a pipe. The bottom of the gas-liquid separator is communicated with the cold box through a first pipe. The gas-liquid separator is communicated with the cold box through a tenth pipe. The cold box is communicated with a methane washing tower. A refrigeration system is communicated with the cold box through two pipes. The refrigeration system, the two pipes and the cold box form a refrigeration circulation system. While generating liquefied natural gas (LNG), the liquefied natural gas and light hydrocarbon recovery device recovers C3+hydrocarbon with higher yield, the yield of dimethylmethane is larger than 98.8%, the yield of C4+ / -hydrocarbon is larger than 99.99%, and larger economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of natural gas liquefaction and light hydrocarbon recovery, in particular to an improved recovery device and recovery method for liquefied natural gas and light hydrocarbon. Background technique [0002] With the rapid development of the energy industry, people are paying more and more attention to the use of clean energy. Energy conservation, environmental protection, and high efficiency have become a major theme in today's energy industry. Since 2005, my country has been importing LNG, a new energy source with high calorific value and environmental protection, from abroad. In recent years, LNG receiving stations have been completed successively in China, marking the official arrival of the era of rapid development of my country's LNG industry. From 483 tons of LNG imports in 2005 to 17 million tons in 2013. There are also many problems behind the rapid development of the LNG industry. Through the invest...

Claims

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Application Information

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IPC IPC(8): F25J3/08
CPCF25J3/0209F25J3/0233F25J3/0242F25J2200/04F25J2200/74F25J2200/78F25J2210/04F25J2270/12
Inventor 朱江陈天洪郑东李才军陈斯
Owner 四川科比科油气工程有限公司