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Process apparatus and method of nitrogen-containing natural gas dual-column cryogenic denitrification

A process device and natural gas technology, which is applied in the fields of nitrogen-containing natural gas double-tower cryogenic removal of nitrogen and nitrogen removal from natural gas, can solve problems such as the reduction of natural gas yield, and achieve the effect of reducing hydrocarbon content and reducing energy consumption of the device.

Pending Publication Date: 2018-08-10
CHINA PETROLEUM ENG & CONSTR +1
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Problems solved by technology

When the nitrogen content in the feed gas is low, the removed nitrogen contains more hydrocarbons such as methane, resulting in a decrease in the yield of natural gas

Method used

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  • Process apparatus and method of nitrogen-containing natural gas dual-column cryogenic denitrification

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Embodiment Construction

[0014] like figure 1 As shown, a device for nitrogen-containing natural gas double-tower cryogenic denitrification of the present invention includes a denitrification cold box 2, a high-pressure denitrification tower 4, a first throttle valve 7, a low-pressure denitrification tower 9, a heat exchanger 11, Second throttle valve 15, nitrogen compressor 20, cooler 22, third throttle valve 25, fourth throttle valve 28, product gas compressor 31, cooler 33;

[0015] The denitrification cold box 2 and the high-pressure denitrification tower 4 are connected through a pipeline 3;

[0016] The bottom outlet of the high-pressure denitrification tower 4, the denitrification cold box 2, the first throttle valve 7, and the low-pressure denitrification tower 9 are connected through pipelines 5, 6, and 8 in sequence;

[0017] The upper outlet of the high-pressure denitrification tower 4, the heat exchanger 11, the denitrification cold box 2, the second throttle valve 15, and the low-pressur...

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Abstract

The invention discloses a process apparatus and method of nitrogen-containing natural gas dual-column cryogenic denitrification. The process apparatus comprises a denitrification cold box and a high-pressure denitrification column connected through a pipeline; a bottom outlet of the high-pressure denitrification column, the denitrification cold box and the high-pressure denitrification column areconnected in sequence; an upper outlet of the high-pressure denitrification column, a heat exchanger, the denitrification cold box and a low-pressure denitrification column are connected in sequence;a top outlet of the low-pressure denitrification column, the denitrification cold box, an ammonia compressor, a cooler, the denitrification cold box and a top feed port of the low-pressure denitrification column are connected in sequence; a bottom outlet of the low-pressure denitrification column, a fourth throttle valve, the denitrification cold box, a product gas compressor and the cooler are connected in sequence. Compared with the prior art, the process apparatus and method have the advantages the hydrocarbon content in nitrogen is greatly decreased, the purity of removed nitrogen is > / =99% by mol; cold is provided for the system after throttling of denitrified liquid hydrocarbon, external coolant circulation is canceled, and energy consumption of the apparatus is decreased.

Description

technical field [0001] The invention relates to the technical field of natural gas processing, in particular to a process device and method for nitrogen-containing natural gas double-tower cryogenic removal of nitrogen, specifically a process for removing nitrogen from natural gas and increasing the calorific value of natural gas, which is suitable for natural gas and coalbed methane One or more of nitrogen-containing hydrocarbon mixtures such as coke oven gas and coke oven gas. Background technique [0002] Natural gas is gradually entering its heyday in the entire energy structure due to its advantages of high quality, high efficiency, and cleanliness. The development and utilization of natural gas is the main trend of energy development in the world today. The main components of natural gas are hydrocarbons such as methane and ethane, but the natural gas produced by many oil and gas fields contains a relatively high concentration of nitrogen. In recent years, shale gas e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10F25J3/08
CPCF25J3/08C10L3/105F25J3/0209F25J3/0233F25J3/0257F25J2200/06F25J2200/72F25J2200/76
Inventor 王科李娜韩淑怡王刚肖乐田静蒲黎明陈运强李莹珂肖俊高鑫汤晓勇杜娟刘艳
Owner CHINA PETROLEUM ENG & CONSTR
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