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Oilfield sewage waste heat recycle and reclaimed water reuse method and device

A technology for oilfield sewage and waste heat recovery, applied in heating water/sewage treatment, preheating, supplementary water supply, etc. The effect of saving energy, reliable principle and simple process

Inactive Publication Date: 2013-09-04
SINOPEC PETROLEUM ENG DESIGN +2
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Problems solved by technology

At present, the waste heat recovery heat pump system of oil field sewage has a complex structure and is difficult to control. The construction cost and management cost are very high, which is almost the same as the benefits generated by waste heat recovery. Although environmental pollution is reduced, for a production cost verification unit, what is sought is less investment and greater investment. Output, unwilling to promote technology with large input and small output

Method used

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  • Oilfield sewage waste heat recycle and reclaimed water reuse method and device

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Embodiment example

[0019] Implementation case: Taking 2000kW oilfield sewage waste heat recovery heat pump boiler combined system as an example, 90℃ oilfield sewage enters the flash tank for flash evaporation, the flow rate is 12409kg / h, and the working pressure of the flash tower is 0.02MPaa (that is, the pressure of the venturi tube injection port) , the steam pressure at the inlet of the Venturi tube is 1MPa, the flow rate is 2412kg / h, the state is wet and saturated, and the mixed outlet pressure of the Venturi tube is 0.1MPaa. The amount of flash steam is 661kg / h, and the flash evaporation rate of sewage is about 5.33%. The concentrated sewage discharged from the bottom of the flash tank is 11747kg / h and enters the sewage tank. The ejection coefficient of the Venturi tube can reach 0.274, and the heating coefficient of the system is 1.26.

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Abstract

The invention discloses an oilfield sewage waste heat recycle and reclaimed water reuse method. The method comprises the steps: a. high pressure steam passes through a Venturi tube and generates negative pressure energy which is needed in flash evaporation in a flash tank; b. atomized oilfield sewage which enters the flash tank is vaporized; c. vaporized gas enters a negative pressure cavity of the Venturi tube and enters a heat exchanger with the high pressure steam; d. energy of the vaporized oilfield sewage is transmitted to crude oil which needs to be heated or to water which supplies heat; e. condensate water in the heat exchanger in pumped into a boiler through a water pump and is used as supplemental water for the boiler, and thus boiler water is saved.

Description

technical field [0001] The invention is a method and device for recovering waste heat from oilfield sewage and regenerating water, which can organically combine steam energy, flash energy and Venturi tube negative pressure system, and is mainly used for heating crude oil produced in oilfields and related energy-saving fields of oilfields . Background technique [0002] Daqing Oilfield, Shengli Oilfield and other large oilfields have entered a period of high water cut after years of development, and the total amount of oily sewage produced is relatively large, with a temperature of about 45-65°C and rich waste heat resources. Judging from the current oilfield production situation, most of these low-temperature sewage have not been fully utilized, and are only used for reinjection or discharge. The heat in the sewage is scattered into the atmosphere, and direct discharge is more likely to cause pollution to the environment from oilfield sewage. . At the same time, oil fields...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B3/04F22D11/06C02F1/06
Inventor 李清方张建张启阳黄少伟孙广领庞会中于惠娟孙志英刘海丽王利君吴鲁宁刘慧英孙灵念陈鲁王辉
Owner SINOPEC PETROLEUM ENG DESIGN
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