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Deep dehydrating system device for natural gas and dehydrating method

A technology of deep dehydration and system installation, applied in separation methods, chemical instruments and methods, gas fuels, etc., can solve the problems of low purity of triethylene glycol and low dehydration depth of natural gas, achieve wide application range, reduce water vapor content, etc. The effect of pressure and cost reduction

Inactive Publication Date: 2017-12-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The first technical problem to be solved by the present invention is to provide a natural gas deep dehydration system device; the device can improve the purity of the triethylene glycol lean liquid to 99.99wt% after regeneration, and use the triethylene glycol lean liquid as an absorbent, It can reduce the dew point of natural gas outlet water treated by water absorption in the absorption system to below -35°C, preferably below -45°C; thus solving the problem of low dehydration depth of natural gas in the absorption system caused by the low purity of triethylene glycol , to meet the dehydration treatment requirements of natural gas with low water dew point

Method used

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  • Deep dehydrating system device for natural gas and dehydrating method

Examples

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Effect test

Embodiment 1

[0076] At the same time, adopt negative pressure enhanced regeneration and regeneration gas enhanced regeneration methods, use the above-mentioned device and process to remove water from natural gas with triethylene glycol: open the third stop valve 13, the fourth stop valve 19, and close the fifth stop valve 20.

[0077] The pressure of natural gas entering the system is 7MPa, the volume ratio of regeneration gas to product gas is 1:2000, the volume ratio of triethylene glycol lean liquid to natural gas raw material gas is 1:10000, and the supergravity level of No. 1 supergravity machine is 200, the supergravity level of the No. 2 supergravity machine is 200, the vacuum degree is 80kPa, the reboiler temperature is 190℃, and the condenser temperature is 30℃. Under this process condition, the purity of the triethylene glycol lean liquid after regeneration reaches about 99.99wt%, and the water dew point of the exported natural gas reaches below -50°C.

Embodiment 2

[0079] As described in Example 1, other conditions remain unchanged, the supergravity level of the first supergravity machine is adjusted to 100, after this process, the purity of triethylene glycol lean liquid after regeneration reaches about 99.99wt%, and the dew point of natural gas water reaches Below -48°C.

Embodiment 3

[0081] As described in Example 1, other conditions remain unchanged, the supergravity level of the first supergravity machine is adjusted to 20, after this process, the purity of triethylene glycol lean liquid after regeneration reaches about 99.99wt%, and the dew point of natural gas water reaches Below -28°C.

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Abstract

The invention discloses a deep dehydrating system device for natural gas. The device is characterized by comprising a filter separator, a first super-gravity machine, a condenser, a poor / rich liquor heat exchanger, a pressurizing pump, a buffer tank, a reboiler, a second super-gravity machine, a flash tank, a conveying pump, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, a fifth stop valve, a reducing valve, a flowmeter, a vacuum pump, a gas-liquid separator and a three-way valve. The invention discloses a dehydrating method. According to the device, the purity of regenerated triethylene glycol poor liquor can be improved to 99.99wt%. By using the triethylene glycol poor liquor as an absorbent, the water dew-point at the natural gas outlet after water absorption in an absorption system is reduced to be below 35 DEG C below zero, preferably 45 DEG C below zero. The problem that the dehydrating depth of natural gas in the absorption system is low as triethylene glycol is not high in purity is solved, and the dehydrating treatment demand on low water dew point natural gas is met.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas treatment and processing, in particular to a natural gas deep dehydration system device and a dehydration method. Background technique [0002] Natural gas is a clean fuel with low combustion pollution and high calorific value, and it plays an increasingly important role in the modern energy structure. However, natural gas contains a large amount of water vapor when it is extracted from oil and gas fields or after desulfurization treatment. The water in natural gas will cause some problems in the process of natural gas processing and transmission. Saturated water vapor in natural gas will condense and form solid hydrate at a specific temperature and pressure, and the low temperature and high pressure environment will aggravate this phenomenon. Solid crystalline hydrate will cause blockage of pipelines, instruments and valves, giving The safe delivery of natural gas poses potential haz...

Claims

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Application Information

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IPC IPC(8): C10L3/10B01D53/14B01D53/18B01D53/24
CPCC10L3/106B01D53/1425B01D53/145B01D53/1493B01D53/18B01D53/24B01D2252/202B01D2257/80
Inventor 张亮亮曹少博刘平陈建峰初广文邹海魁孙宝昌罗勇
Owner BEIJING UNIV OF CHEM TECH
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