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Natural gas liquefaction heavy hydrocarbon and benzene removal system

A technology for removing heavy hydrocarbons and natural gas, which is applied in the direction of gas fuel, gas treatment, chemical instruments and methods, etc. It can solve the problems of heavy hydrocarbon removal and benzene system hydrocarbon content exceeding the standard, heavy hydrocarbon and aromatic hydrocarbon content increase, and overcooling in the cold box Problems such as heat exchanger blockage

Pending Publication Date: 2021-07-30
西安深冷能源设备有限公司
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Problems solved by technology

Because it is separated at normal temperature, the regenerated gas returning to the front of the compressor still contains a large amount of heavy hydrocarbons and aromatic hydrocarbons. During continuous operation, the content of heavy hydrocarbons and aromatic hydrocarbons in the feed gas will increase cumulatively, resulting in the removal of heavy hydrocarbons and The hydrocarbon content in the benzene system exceeds the standard, which in turn causes the blockage of the subcooling heat exchanger in the cold box

Method used

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  • Natural gas liquefaction heavy hydrocarbon and benzene removal system
  • Natural gas liquefaction heavy hydrocarbon and benzene removal system

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Embodiment 1

[0027] A system for removing heavy hydrocarbons and benzene from natural gas liquefaction, including an adsorption tower. There are two adsorption towers, one for adsorption and the other for regeneration; the adsorption tower is connected to a regeneration system, and the regeneration system includes regeneration gas heating The regeneration gas cooler, the regeneration gas separator and the regeneration gas dehydrogenation skid; the cooling temperature of the regeneration gas dehydrogenation skid is -30℃~-20℃.

[0028] The invention provides a natural gas liquefaction system for removing heavy hydrocarbons and benzene. The dehydrated and purified natural gas enters an adsorption tower, and the activated carbon in the adsorption tower adsorbs and removes aromatic hydrocarbon impurities in the natural gas, and then takes out the dust through a dust filter. Enter the natural gas mercury removal system; when the adsorption tower is not adsorbing, it will be regenerated through th...

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Abstract

The invention provides a natural gas liquefaction heavy hydrocarbon and benzene removal system. The system comprises two adsorption towers, one adsorption tower is used for adsorption, and the other adsorption tower is used for regeneration; the adsorption tower is connected with a regeneration system, the regeneration system comprises a regeneration gas heater, a regeneration gas cooler, a regeneration gas separator and a regeneration gas dealkylation pry; and the cooling temperature of the regeneration gas dealkylation pry is -30 DEG C to -20 DEG C. The system has a good heavy hydrocarbon and benzene removal effect, and blockage of the cold box is avoided.

Description

technical field [0001] The invention relates to the technical field of natural gas liquefaction, in particular to a natural gas liquefaction system for removing heavy hydrocarbons and benzene. Background technique [0002] Liquefied Natural Gas (LNG for short), whose main component is methane, is currently recognized as the cleanest energy on earth. Generally, liquefied natural gas is formed by liquefying natural gas in a cold box after pressurization, decarbonization, desulfurization, dehydration, mercury removal, and benzene removal. [0003] However, natural gas raw materials contain a large amount of heavy hydrocarbons and benzene impurities. If these impurities are not removed, the subcooling heat exchanger and LNG throttle valve in the cold box will be frozen and blocked, and the device will not operate normally. [0004] The benzene removal system consists of two benzene removal adsorption towers, a regeneration gas heater, a regeneration gas cooler, a regeneration g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10B01D53/02B01D53/00
CPCB01D53/002B01D53/02B01D2257/702B01D2257/7027B01D2259/4006C10L3/101
Inventor 刘果张福科
Owner 西安深冷能源设备有限公司
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