CN103277780A - Oilfield sewage waste heat recycle and reclaimed water reuse method and device - Google Patents
Oilfield sewage waste heat recycle and reclaimed water reuse method and device Download PDFInfo
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- CN103277780A CN103277780A CN2013101619315A CN201310161931A CN103277780A CN 103277780 A CN103277780 A CN 103277780A CN 2013101619315 A CN2013101619315 A CN 2013101619315A CN 201310161931 A CN201310161931 A CN 201310161931A CN 103277780 A CN103277780 A CN 103277780A
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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
The present invention is a kind of oilfield sewage heat recovery that steam energy, flash distillation energy and Venturi tube negative pressure system can be organically combined and method and the device of recycled water, is mainly used in field produces heating crude oil and associated oil field energy saving field.
Background technology
Large-scale oil field such as Daqing oil field, Shengli Oil Field has entered high water-cut stage through exploitation for many years, and the oil-polluted water total amount of output is bigger, and its temperature is about 45-65 ℃, and containing has abundant residual heat resources.From the condition of production in present oil field, these low-temperature sewage major parts fail to be fully utilized, and only are used for re-injection or emit, and the heat in the sewage spills into atmosphere in vain, and directly discharging more can be made the car oilfield sewage to the pollution of environment.Meanwhile, the employing steam generator system that also needs of oil field provides a large amount of thermals source for Crude Oil Transportation and the dehydration of crude oil.How to realize the oilfield sewage heat recovery, and reduce the important goal that the oil field boiler energy resource consumption becomes the oil field energy saving reduction of discharging.Present oilfield sewage heat pump of recovering residual heat system architecture complexity, restive, construction cost and administrative expenses are very high, and are very nearly the same with the benefit that waste heat recovery produces; Though reduced environmental pollution, for a production cost nuclear mark unit, what ask is the output that has high input less, is unwilling to promote the technology of the little output of big input.
Summary of the invention
What the purpose of this invention is to provide a kind of oilfield sewage waste heat recovery that steam energy, flash distillation energy and Venturi tube negative pressure system can be organically combined and recycled water utilizes method and device, overcome the defective that above-mentioned prior art exists, oilfield sewage heat recovery technology is popularized in an all-round way in the oil field, obtain huge economic and social benefit with less investment
Technical scheme of the present invention realizes in the following manner:
The present invention can produce the needed negative pressure energy of flash tank flash distillation by Venturi tube with high steam, oilfield sewage after the atomizing that enters in the flash tank is vaporized, vaporization vapour enters the negative pressure cavity of Venturi tube, be mixed into heat exchanger with high steam, providing hot water by the thermal energy transfer in the back oilfield sewage of vaporizing to the crude oil that needs heating or to heating, and the condensed water in the heat exchanger is pumped into boiler by water pump, as the make-up water of boiler, save boiler feed water.
The inventive system comprises boiler, water pump, flash tank, Venturi tube, heat exchanger, flow control valve, fog-spray nozzle, liquid level sensor and pressure sensor, it is characterized in that oilfield sewage links to each other with the import of flash tank oilfield sewage by flow control valve, flow control valve links to each other with the liquid level sensor of flash tank by holding wire, the flash steam outlet of flash tank links to each other with the negative pressure import of Venturi tube, and the concentrated outlet of sewer of flash tank links to each other with blowdown pipeline; The import of Venturi tube links to each other with the steam (vapor) outlet of boiler by steam flow control valve, steam flow control valve links by the pressure sensor of holding wire and flash tank, the outlet of Venturi tube links to each other with the import of heat exchanger, the outlet of heat exchanger links to each other with water tank by water pipeline, the water tank outlet links to each other with the water pump import, and exit of pump links to each other with the boiler feed water mouth; Be provided with the heating crude oil coil pipe in the heat exchanger.
Flash tank is made as vertical and cylindrical, upper and lower side is provided with end socket, be provided with the flash steam outlet at the upper cover middle part, be provided with concentrated outlet of sewer at the low head middle part, be provided with the oilfield sewage inlet tube in the middle and upper part, the port of export of original sewage induction pipe is provided with M shape or toroidal nozzle, and the jet pipe lower half evenly is provided with micropore, be provided with liquid level sensor in the middle and lower part, top is provided with pressure sensor.
Compared with the prior art the present invention has the following advantages:
1, principle is reliable, and flow process is simple, reduces investment outlay;
2, can give heating crude oil the oilfield sewage waste heat recovery, save the energy;
3, in waste heat recovery, can become the condensation clear water that meets the boiler water supply standard to the part oilfield sewage, save water resource.
Description of drawings
Accompanying drawing 1 is schematic flow sheet process chart of the present invention.
Accompanying drawing 1 description of symbols: 1-flow control valve, 2-flash tank, 3-jet pipe, 4-concentrate outlet of sewer, 5-water pump, 6-boiler, 7-flow control valve, 8-Venturi tube, 9-heat exchanger, 10-flow control valve, 11-water tank, LT-liquid level sensor, PT-pressure sensor.
The specific embodiment
The inventive system comprises boiler 6, water pump 5, flash tank 2, Venturi tube 8, heat exchanger 9, flow control valve 1,7,10, jet pipe 3, liquid level sensor LT and pressure sensor PT, it is characterized in that oilfield sewage links to each other with the import of flash tank oilfield sewage by flow control valve, flow control valve links to each other with the liquid level sensor of flash tank by holding wire, the flash steam outlet of flash tank links to each other with the negative pressure import of Venturi tube, and the concentrated outlet of sewer of flash tank links to each other with blowdown pipeline; The import of Venturi tube connects by the steam (vapor) outlet of steam flow control valve 7 with boiler, steam flow control valve links by the pressure sensor of holding wire and flash tank, the outlet of Venturi tube links to each other with the import of heat exchanger, the outlet of heat exchanger links to each other with water tank by water pipeline, the water tank outlet links to each other with the water pump import, and exit of pump links to each other with boiler feed water; Be provided with the heating crude oil coil pipe in the heat exchanger.
The temperature of oilfield sewage is generally 45～65 ℃.Oilfield sewage under this temperature enters flash tank 2, carries out flow-control by oilfield sewage flow control valve 1.Oilfield sewage flow control valve 1 control signal is drawn the liquid level sensor on flash tank 2, can realize the interlock control of the discharge of sewage and flash tank liquid level.Oilfield sewage under low pressure carries out flash distillation and handles by jet pipe 3 ejections in the flash tank 2.The liquid phase of flash tank 2 bottoms is discharged by concentrating outlet of sewer 4.The flash steam that flashes off mixes with the high temperature and high pressure steam that boiler 6 produces through Venturi tube 8 ejector actions.The steam of boiler 6 adopts steam flow control valve 7 to carry out Flow-rate adjustment, and the control signal of steam flow control valve 7 is drawn the pressure sensor PT on flash tank 2.Adopt the jet ejector action of Venturi tube, the flash steam that flash tank 2 is come out mixes with the high temperature and high pressure steam that boiler produces, the heating that mixed steam is realized crude oil by heat exchanger 9.
Enter in the crude heat exchanger 9 from the mixed vapour of Venturi tube 8 and to carry out heat exchange with low temperature crude oil, oil flow adopts 10 controls of oil flow control valve.The condensed clear water of mixed vapour enters water tank 11, squeezes into boiler 6 by water pump 5, and under the heating of boiler 6, condensed water is heated gasification for high temperature and high pressure steam, enters Venturi tube 8 then, realizes intrasystem water circulation.
This system realizes the flash distillation of oilfield sewage part by flash tank 2, reclaim the steam that flashes off and the waste heat that carries thereof by the Venturi tube ejector action, and by 9 pairs of crude oil heat releases of heat exchanger condensation, when realizing the oilfield sewage heat recovery, renewablely go out a certain proportion of clear water.
The liquid level sensor LT that arranges among the present invention and pressure sensor PT be by Based Intelligent Control cabinet control, make system of the present invention be easy to regulate and operating mode stable.
Case study on implementation: be example with 2000kW oilfield sewage heat pump of recovering residual heat boiler association system, 90 ℃ of oilfield sewages enter the flash tank flash distillation, flow is 12409kg/h, flash column operating pressure 0.02MPaa(is Venturi tube ejecting port pressure), Venturi tube inlet steam pressure 1MPa, flow is 2412kg/h, and state is wet saturated, and Venturi tube mixed export pressure is 0.1MPaa.The flash-off steam amount is 661kg/h, and sewage flash distillation rate is about 5.33%, and the flash tank bottom is discharged and concentrated sewage 11747kg/h and enter cesspool.The mass ratio of induced-to-inducing air of Venturi tube can reach 0.274, and system's heating efficiency is 1.26.
Claims (3)
1. an oilfield sewage waste heat recovery and reclaimed wastewater reuse method, be that high steam can be produced the needed negative pressure energy of flash tank flash distillation by Venturi tube, oilfield sewage after the atomizing that enters in the flash tank is vaporized, vaporization vapour enters the negative pressure cavity of Venturi tube, be mixed into heat exchanger with high steam, providing hot water by the thermal energy transfer in the back oilfield sewage of vaporizing to the crude oil that needs heating or to heating, and the condensed water in the heat exchanger is pumped into boiler by water pump, as the make-up water of boiler, save boiler feed water.
2. an oilfield sewage waste heat recovery and reclaimed wastewater reuse device, comprise boiler, water pump, flash tank, Venturi tube, heat exchanger, flow control valve, fog-spray nozzle, liquid level sensor and pressure sensor, it is characterized in that oilfield sewage links to each other with the import of flash tank oilfield sewage by flow control valve, flow control valve links to each other with the liquid level sensor of flash tank by holding wire, the flash steam outlet of flash tank links to each other with the negative pressure import of Venturi tube, and the concentrated outlet of sewer of flash tank links to each other with blowdown pipeline; The import of Venturi tube links to each other with the steam (vapor) outlet of boiler by steam flow control valve, steam flow control valve links by the pressure sensor of holding wire and flash tank, the outlet of Venturi tube links to each other with the import of heat exchanger, the outlet of heat exchanger links to each other with water tank by water pipeline, the water tank outlet links to each other with the water pump import, and exit of pump links to each other with the boiler feed water mouth; Be provided with the heating crude oil coil pipe in the heat exchanger.
3. oilfield sewage waste heat recovery according to claim 2 and reclaimed wastewater reuse device, it is characterized in that: flash tank is made as vertical and cylindrical, upper and lower side is provided with end socket, be provided with the flash steam outlet at the upper cover middle part, be provided with concentrated outlet of sewer at the low head middle part, be provided with the oilfield sewage inlet tube in the middle and upper part, the port of export of original sewage induction pipe is provided with M shape or toroidal nozzle, the jet pipe lower half evenly is provided with micropore, is provided with liquid level sensor in the middle and lower part, and top is provided with pressure sensor.
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| CN2013101619315A CN103277780A (en) | 2013-05-06 | 2013-05-06 | Oilfield sewage waste heat recycle and reclaimed water reuse method and device |
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| CN2013101619315A CN103277780A (en) | 2013-05-06 | 2013-05-06 | Oilfield sewage waste heat recycle and reclaimed water reuse method and device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595877A (en) * | 2015-01-16 | 2015-05-06 | 王伟东 | Device for multi-stage decompression recycling high-temperature waste water residual heat and recycling method thereof |
| CN104695921A (en) * | 2013-12-06 | 2015-06-10 | 中国石油化工股份有限公司 | System for utilizing oil field produced wastewater to prepare high-dryness steam for steam flooding |
| CN104728896A (en) * | 2015-03-13 | 2015-06-24 | 山东胜利职业学院 | Oilfield produced water low-boiling pressurized condensation heat exchange equipment and technology |
| CN105423266A (en) * | 2015-12-25 | 2016-03-23 | 中石化节能环保工程科技有限公司 | High and low-temperature sewage waste heat cascade utilization and resource recycling system and method thereof |
| CN107420865A (en) * | 2017-07-26 | 2017-12-01 | 江阴宇博科技有限公司 | A kind of waste water reclaiming device |
| WO2017206281A1 (en) * | 2016-06-01 | 2017-12-07 | 中油锐思技术开发有限责任公司 | Cooling and gasification device, waste water composite heat carrier generator, and composite heat carrier generation method |
| EA034468B1 (en) * | 2016-06-01 | 2020-02-11 | Сиенписи Глобал Солюшнс Лтд. | Cooling and gasification device, waste water composite heat carrier generator, and composite heat carrier generation method |
| CN111362358A (en) * | 2020-03-09 | 2020-07-03 | 三元控股集团杭州热电有限公司 | Equipment and process for improving reverse osmosis efficiency by heat recovery |
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| DE3034379A1 (en) * | 1980-09-12 | 1982-04-22 | General Electric Co., Schenectady, N.Y. | Recovery of waste, from pressurised steam condensate - by flashing off steam in flash tank and recondensing by contact with water |
| RU2177450C1 (en) * | 2000-04-14 | 2001-12-27 | Ульяновский государственный технический университет | Method of preparation of make-up water for heat-supply system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104695921A (en) * | 2013-12-06 | 2015-06-10 | 中国石油化工股份有限公司 | System for utilizing oil field produced wastewater to prepare high-dryness steam for steam flooding |
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| CN104595877A (en) * | 2015-01-16 | 2015-05-06 | 王伟东 | Device for multi-stage decompression recycling high-temperature waste water residual heat and recycling method thereof |
| CN104595877B (en) * | 2015-01-16 | 2017-09-29 | 王伟东 | Multi-step pressure reduction reclaims the device and its recovery method of hot waste water waste heat |
| CN104728896A (en) * | 2015-03-13 | 2015-06-24 | 山东胜利职业学院 | Oilfield produced water low-boiling pressurized condensation heat exchange equipment and technology |
| CN105423266A (en) * | 2015-12-25 | 2016-03-23 | 中石化节能环保工程科技有限公司 | High and low-temperature sewage waste heat cascade utilization and resource recycling system and method thereof |
| WO2017206281A1 (en) * | 2016-06-01 | 2017-12-07 | 中油锐思技术开发有限责任公司 | Cooling and gasification device, waste water composite heat carrier generator, and composite heat carrier generation method |
| EA034468B1 (en) * | 2016-06-01 | 2020-02-11 | Сиенписи Глобал Солюшнс Лтд. | Cooling and gasification device, waste water composite heat carrier generator, and composite heat carrier generation method |
| CN107420865A (en) * | 2017-07-26 | 2017-12-01 | 江阴宇博科技有限公司 | A kind of waste water reclaiming device |
| CN111362358A (en) * | 2020-03-09 | 2020-07-03 | 三元控股集团杭州热电有限公司 | Equipment and process for improving reverse osmosis efficiency by heat recovery |
| CN111362358B (en) * | 2020-03-09 | 2022-01-28 | 三元控股集团杭州热电有限公司 | Equipment and process for improving reverse osmosis efficiency by heat recovery |
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Application publication date: 20130904 |