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Dehydration system for natural gas and method thereof

A technology of natural gas and dehydration tower, applied in the field of natural gas, can solve problems such as incomplete dehydration of natural gas

Active Publication Date: 2018-04-17
XIAN CHANGQING TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the existing problem of incomplete dehydration of natural gas, the present invention provides a dehydration system and method for natural gas. The system cools methanol at a low temperature, and then acts as a circulating agent to absorb moisture in natural gas. The moisture in natural gas in the system is used The removal rate reaches 99.99%, completely realizing deep dehydration

Method used

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  • Dehydration system for natural gas and method thereof

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Embodiment 1

[0026] In order to overcome the problem of incomplete dehydration of existing natural gas, the present invention provides such as figure 1 A dehydration system and method for natural gas is shown. The system cools methanol at a low temperature, and then acts as a circulating agent to absorb moisture in natural gas. The moisture removal rate in natural gas using this system reaches 99.99%, fully realizing deep dehydration.

[0027]A dehydration system for natural gas, comprising a first separator 2, a first heat exchanger 3, a first absorption tower 4, a second heat exchanger 6, a second separator 7, a second absorption tower 9, a third Separator 10, first mixer 11, water washing tower 12, second distributor 16, molecular sieve dryer 17, dehydration tower 22; the lower end of the first separator 2 is provided with the first separator outlet 39 The outlet at the upper end of the first separator 2 is connected with the first heat exchanger 3, the outlet at the lower end of the f...

Embodiment 2

[0030] On the basis of the foregoing embodiments, in this embodiment, the third heat exchanger 19 is provided with a third heat exchanger outlet 35; the inlet at the upper end of the third heat exchanger 19 communicates with the outlet at the lower end of the reboiler 23 .

[0031] A throttling valve 5 is provided between the outlet at the lower end of the first absorption tower 4 and the inlet at the lower end of the second heat exchanger 6 .

[0032] The lower end of the molecular sieve dryer 17 is provided with a molecular sieve dryer outlet 37 .

[0033] A first cooler 21 is provided between the dehydration tower 22 and the fourth separator 25 .

[0034] The third mixer 27 is provided with a second methanol inlet 32 ​​.

[0035] The lower end of said 10 is provided with a third separator outlet 34 .

[0036] A method for dehydration of natural gas, the specific steps are:

[0037] The raw natural gas 1 enters the first separator 2 for the first separation; the separate...

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Abstract

The invention provides a dehydration system for natural gas and a method thereof. The system comprises a first separator, a first heat exchanger, a first absorbing tower, a second heat exchanger, a second separator, a second absorbing tower, a third separator, a first mixer, a water scrubbing tower, a second distributor, a molecular sieve dryer and a dehydrating tower. The lower end of the first separator is provided with an exhaust port of the first separator. An upper outlet of the first separator is connected to the first heat exchanger. A lower outlet of the first heat exchanger is communicated with a lower inlet of the first absorbing tower. The upper end of the first absorbing tower is communicated with an upper inlet of the first heat exchange, an upper outlet of which is connectedto a dehydrated natural gas collecting pipeline. According to the invention, methanol undergoes cryogenic cooling and the cooled methanol is used as a circulation agent to absorb moisture in natural gas. By the adoption of the system, removal rate of moisture in natural gas reaches 99.99%, completely realizing deep dehydration to prevent corrosion.

Description

technical field [0001] The invention belongs to the field of natural gas, and in particular relates to a dehydration system and method for natural gas. Background technique [0002] In general, natural gas dehydration refers to the process of removing saturated water vapor from natural gas or removing dissolved water from natural gas liquids (NGL). Purpose of dehydration: 1) Prevent hydrate and liquid water from appearing during handling, storage and transportation. 2) Conform to the quality index of natural gas water content (or water dew point). 3) Prevent corrosion. Conventional dehydration methods in natural gas processing include cryogenic method and absorption method. The cryogenic method is to cool natural gas to a low temperature below the hydrocarbon dew point to obtain a part of liquid hydrocarbons rich in heavier hydrocarbons (that is, natural gas condensate or condensate), and separate it from the gas at this low temperature, so it is also called condensation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10B01D53/26
CPCB01D53/263C10L3/106B01D2252/2021
Inventor 王勇
Owner XIAN CHANGQING TECH ENG