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Alcohol-containing sewage pretreatment process

A sewage pretreatment and process technology, applied in the direction of water/sewage treatment, heating water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of high oil content alcohol sewage sewage oil recovery, methanol sewage entering the system blockage, It does not settle the problems of suspended matter and emulsified oil, and achieves the effect of reducing sediment accumulation, preventing blockage and reducing water content

Inactive Publication Date: 2017-09-26
XIAN CHANGQING TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the existing problems of high cost of gas production and blockage, corrosion and scaling of the methanol recovery device used, the present invention provides a pretreatment process for alcohol-containing sewage. The present invention solves the problem of blockage of methanol sewage with high sediment content entering the system , high oil content, alcohol-containing sewage and dirty oil recovery problems and difficult to deal with unsettled suspended solids and emulsified oil in alcohol-containing sewage, which not only reduces the cost of gas production, but also controls the oil content and suspended solids content, ensuring the smooth operation of subsequent methanol regeneration units

Method used

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Embodiment 1

[0028] In order to overcome the existing problems of high cost of gas production and blockage, corrosion and scaling of the methanol recovery device used, the present invention provides an alcohol-containing sewage pretreatment process, which solves the problem of high-silt methanol sewage entering the system blockage , High oil content, alcohol-containing sewage and dirty oil recovery problems and difficult to deal with unsettled suspended solids and emulsified oil in alcohol-containing sewage, not only reduce gas production costs, but also control oil content and suspended solids content, and ensure the smooth operation of subsequent methanol regeneration units.

[0029] A pretreatment process for alcohol-containing sewage, the specific steps are:

[0030] Step 1: The alcohol-containing sewage hauled from the gas gathering station is transported to the water treatment station and unloaded to the grit chamber 1 for preliminary separation of oil and sediment.

[0031] The alco...

Embodiment 2

[0038] Based on the above embodiments, in this embodiment, in the first step, the waste oil after the preliminary oil and sediment separation is directly stored in the buried oil transfer tank 8 .

[0039] In the second step, after the secondary oil-water separation is completed through the primary booster pump 2 and the storage tank 3, a certain amount of water is stored in the storage tank 3 at the same time, and the water quality is adjusted so that the oil content in the separated sewage is ≤ 1000mg / L.

[0040] In the third step, the outlet water of the storage tank 3 is lifted by the secondary booster pump 4 and enters the heat exchanger 5 to raise the water temperature to 20°.

[0041] In said step 4, for the removal of non-sinkable suspended solids and emulsified oil, a certain amount of oil is added to the alcohol-containing sewage to be treated, and then the medicament is added after emulsification, and the alum flowers generated by the medicament are added to absorb...

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Abstract

The invention provides an alcohol-containing sewage pretreatment process. The alcohol-containing sewage pretreatment process comprises the following steps: 1, transporting alcohol-containing sewage from a gas collecting station to a water treatment station, unloading the alcohol-containing sewage into a grit chamber, and primarily separating oil from silt; 2, through a primary pressure pump, lifting the separated alcohol-containing sewage into an adjusting storage tank for secondary oil and water separation; 3, through a secondary pressure pump, lifting effluent of the adjusting storage tank into a heat exchanger for raising the water temperature; 4, after heat exchange of the heat exchanger, enabling the effluent to enter a water treatment device for removing emulsified oil and unsinkable suspensions, and enabling the effluent to enter a methanol recycling device for separating and recycling methanol; 5, enabling sludge produced by the water treatment device in the step 4 to enter a sludge reducing device for sludge and water separation, dewatering, and transporting out the sludge; 6, enabling sump oil recycled from the grit chamber and the adjusting storage tank to enter a buried oil transferring tank for storage, and transporting out regularly. By the alcohol-containing sewage pretreatment process, pump blockage is prevented and silt accumulation in the follow-up storage tank is reduced, so that the water content of the discharged oil is reduced and the sump oil is recycled as much as possible.

Description

technical field [0001] The invention relates to the field of gas field sewage treatment, and is a pretreatment process for alcohol-containing sewage. Background technique [0002] The equilibrium temperature of natural gas hydrate formation in the Ordos Basin gas field is 23 °C, while the temperature of natural gas at the wellhead is generally only 15-18 °C, which is easy to form hydrates, so alcohol injection is required to prevent the formation of hydrates. Most of the methanol injected is miscible with the free water in the pipeline, and the methanol-containing sewage in the gas field is produced after separation from the natural gas at the gas gathering station and natural gas treatment plant. In order to reduce the cost of gas production, it is necessary to use a methanol regeneration device to recover and recycle methanol. [0003] The sewage entering the station every day comes from different gas gathering stations, and the water quality varies greatly (produced in d...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F11/12C02F101/34
CPCC02F1/02C02F1/281C02F1/40C02F1/52C02F9/00C02F11/12C02F2001/007C02F2101/34
Inventor 杜杰林罡李勇单巧利王彦斌王国柱王莉娜吴志斌范婧何志英
Owner XIAN CHANGQING TECH ENG
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