Gas field methanol sewage disposal process

A technology of sewage treatment and process, which is applied in the field of methanol sewage treatment process in gas fields, and can solve problems such as scaling of heat exchange equipment, plugging of rectification tower packing, corrosion of equipment and pipelines, etc.

Inactive Publication Date: 2007-05-23
XIAN CHANGQING TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there have been many experiences for reference in the treatment of gas field sewage, the treatment of methanol sewage in gas fields needs to solve problems such as equipment and pipeline corrosion, rectification column packing blockage, and heat exchange equipment scaling.

Method used

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  • Gas field methanol sewage disposal process
  • Gas field methanol sewage disposal process

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Experimental program
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Embodiment Construction

[0025] As shown in Figure 1, the gas field sewage entering the oil removal tank 1 is placed in the coagulation settling tank 3 after the pretreatment process. Heating heat exchanger 4, preheating the outlet water from the bottom of rectification tower 8 to 40-65°C, entering raw material heating heat exchanger 12, heating with steam to boiling point 90°C, and entering rectification tower 8 through inlet 803 in the middle of rectification tower ; The liquid phase in the rectification tower 8 flows from top to bottom and contacts with the secondary steam moving from bottom to top in countercurrent to complete the heat and mass transfer process; Potential difference enters the kettle-type reboiler 10, partly vaporizes and returns to the bottom of the rectifying tower 8 after being heated by steam, and part of it is pumped out as the bottom product of the rectifying tower 8 with a pump 17, and enters the water storage after exchanging heat with the feed liquid to about 40°C tank 7,...

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Abstract

The invention relates to the water treatment technology, especially a gas field methanol sewage treatment technology which at least includes pretreating technology, methanol reclaiming technology and sewage back-flowing technology. The characteristic of the invention: after removing oil, adjusting Ph value, oxidizing to remove iron and flocculating/precipitating, separate the methanol from the sewage in the methanol-reclaiming device the core of which is dephlegmation tower, the treated water goes back to stratum. The invention finally managed to reclaim the methanol with zero release of waste liquids. The methanol-reclaiming dephlegmation tower adopts ''filling material + sieve pore (or oblique aperture)'' and ''floating valve + sieve pore (or oblique aperture)'' complex tower model to solve many problems such as obstructing and the adaptability of the dephlegmation tower to the large change of methanol content in different sewages.

Description

technical field [0001] The invention relates to a sewage treatment process, in particular to a gas field methanol sewage treatment process. Background technique [0002] In the process of natural gas extraction, it is necessary to inject methanol into the gas production pipeline from the wellhead of the gas well to suppress the formation of natural gas hydrate. Because most of the injected methanol dissolves with the free water in the pipeline and is separated from the natural gas at the gas gathering station, methanol sewage in the gas field is produced (each gas gathering station is equipped with methanol tanks, methanol sewage tanks and multiple alcohol injection pumps) . [0003] Methanol is a moderately toxic substance, and methanol sewage from gas fields has "many points, wide areas, and complex components." Therefore, the research and development of "gas field methanol wastewater treatment technology" has two purposes: [0004] 1. Research and develop the "methanol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/52C02F1/04C07C31/04C02F1/66C02F1/72
Inventor 李勇何宗平杨世海葛辉潘新建林罡张明礼郭信军李翠英
Owner XIAN CHANGQING TECH ENG
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