CN112794537A - Seawater desalination process system for providing boiler make-up water for offshore oil field heavy oil thermal recovery - Google Patents
Seawater desalination process system for providing boiler make-up water for offshore oil field heavy oil thermal recovery Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
- C02F2209/055—Hardness
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/04—Softening water by precipitation of the hardness using phosphates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a seawater desalination process system for providing boiler make-up water for offshore oil field heavy oil thermal recovery, which comprises an ultrafiltration unit, a desalination unit and a thermal deoxidization unit which are sequentially connected, wherein the ultrafiltration unit comprises a seawater lift pump, a self-cleaning filter, a plate heat exchanger, a pipeline coagulation device and an ultrafiltration membrane which are sequentially connected, and the ultrafiltration membrane is a ceramic ultrafiltration membrane; the desalting unit comprises a water production buffer tank, a reverse osmosis water supply pump, a cartridge filter, a three-stage reverse osmosis unit and an electrodialysis unit which are connected in sequence; the thermal deoxygenation unit comprises a plate heat exchanger and a deoxygenator. According to the invention, the ceramic membrane ultrafiltration, the reverse osmosis, the EDI and the low-energy-consumption deep deoxidation process technology are integrated, so that a make-up water treatment integrated system with simple process, compact device and light weight is developed; reduce the waste liquid emission, reduce membrane equipment loss, reduce operation, fortune dimension working strength by a wide margin, guarantee that equipment is stable to be up to standard and moves.
Description
Technical Field
The invention belongs to the technical field of seawater desalination, and particularly relates to a seawater desalination process system for providing boiler make-up water for thickened oil thermal recovery in an offshore oil region.
Background
The sea area of China has abundant oil and gas resources, the land oil and gas yield is in a decreasing trend at present, the national oil demand is steadily increased, and the continuous increase of the offshore oil field yield becomes an important component of the national oil yield increase and yield succession. The Bohai sea oil field heavy oil resource has the characteristics of large reserve capacity scale, deep oil reservoir burial, wide viscosity range and the like. At present, 48 thick oil fields and oil-gas structures are found in Bohai sea oil fields, the detected thick oil geological reserves account for 50.4% of the total detected petroleum geological reserves, and the unconventional thick oil accounts for 30.2% of the total thick oil reserves. For unconventional heavy oil reservoirs, thermal recovery development is adopted at home and abroad. In the thermal recovery process, the high-pressure boiler for providing steam has extremely high requirement on the quality of make-up water, and the use of pure fresh water is favorable for the long-time stable operation of the steam injection boiler. Aiming at the special condition of an offshore platform, the factors of low cost, energy conservation, stability, high efficiency, convenient operation and the like are comprehensively considered, the reverse osmosis membrane method is used for desalting the sea, and the produced fresh water is most suitable to be used as the make-up water of the thermal recovery steam injection boiler. However, the requirement for the quality of the reverse osmosis membrane and the incoming water is high, if the pretreatment process before the reverse osmosis membrane enters cannot ensure the stability of the quality of the produced water, the service life of the reverse osmosis membrane is shortened, the membrane material is frequently replaced, a large amount of operation cost is increased, and the whole seawater desalination system is seriously paralyzed.
The ultrafiltration technology can filter the primarily treated seawater to meet the water quality requirement required by the reverse osmosis system, and can ensure the stable operation of the reverse osmosis system. The ultrafiltration pretreatment system generally uses organic membrane materials, has short service life and weak impact resistance, can cause the condition of broken filaments of the organic membrane, causes the penetration of bacteria and high turbidity/SDI raw water, increases the cleaning frequency of subsequent reverse osmosis membranes, and also has the problems of high requirement on membrane cleaning, poor membrane performance restorability and the like.
Compared with the traditional ion exchange resin, the EDI (continuous electric desalting technology) has the characteristics of continuous operation, no need of chemical reagent regeneration, no waste liquid discharge, simple operation, high automation degree, small occupied area and the like. However, the whole process system is fragile, the adopted membrane is easily polluted by impurities, and is easily degraded when meeting high temperature or oxidizing substances and high-valence metal ions, the requirement on the quality of inlet water is high, and the required water quality fluctuation is low. The seawater quality fluctuation is large, the salt treatment capacity of the currently common single-stage or two-stage reverse osmosis is limited, the conductivity and silicon content of reverse osmosis produced water are likely to exceed the water inlet index of EDI, and the scaling inside a module is likely to be caused, so that equipment is scrapped and the normal production of an offshore platform is affected.
In conclusion, the offshore oil field has large sediment content and large water quality fluctuation, and the existing seawater desalination process has the problems of unstable produced water quality, complex structure, long process flow, low integration degree and the like, and cannot meet the construction conditions of limited area and space of the offshore oil production platform and the water quality requirement of boiler makeup water.
Disclosure of Invention
The invention aims to solve the two technical problems of the application of the membrane method seawater desalination technology in the offshore oil field heavy oil thermal recovery steam injection process: 1. the silt content of the seawater is large, the water quality fluctuation is large, the treatment process of the existing membrane method water treatment system has poor impact resistance, and the long-time stability of the produced water quality cannot be realized; 2. the existing membrane method seawater desalination process has the characteristics of complex technical structure, huge engineering, low integration degree and the like, cannot meet the technical requirements of limited area and space of an offshore oil production platform, and provides a seawater desalination process system for providing boiler make-up water for thick oil thermal recovery of an offshore oil field.
The invention is mainly solved by the following technical scheme:
a seawater desalination process system for providing boiler make-up water for offshore oil field heavy oil thermal recovery comprises an ultrafiltration unit, a desalination unit and a thermal deoxygenation unit which are sequentially connected,
the device comprises an ultrafiltration unit, a heat exchanger, a pipeline coagulation device and a heat exchanger, wherein the ultrafiltration unit comprises a seawater lift pump, a self-cleaning filter, a plate heat exchanger, a pipeline coagulation device and an ultrafiltration membrane which are sequentially connected, and the ultrafiltration membrane is a ceramic ultrafiltration membrane;
the desalting unit comprises a water production buffer tank, a reverse osmosis water supply pump, a cartridge filter, a three-stage reverse osmosis unit and an electrodialysis unit which are connected in sequence; the three-stage reverse osmosis unit comprises a first-stage reverse osmosis unit, a second-stage reverse osmosis unit and a third-stage reverse osmosis unit, wherein the front end of each stage of reverse osmosis unit is provided with a reverse osmosis booster pump, and the rear end of each stage of reverse osmosis unit is connected with a reverse osmosis buffer tank; wherein the concentrated water outlet of the second-stage reverse osmosis is connected with the inlet of the water production buffer tank, and the concentrated water outlet of the electrodialysis unit is connected with the reverse osmosis buffer tank arranged at the rear end of the second-stage reverse osmosis so as to enter the third-stage reverse osmosis for desalination treatment;
the thermal deoxygenation unit comprises a plate heat exchanger and a deoxygenator;
the ultrafiltration membrane of the ultrafiltration unit is connected with the produced water buffer tank of the desalination unit, and the reverse osmosis buffer tank at the rear end of the third-stage reverse osmosis of the desalination unit is connected with the plate heat exchanger of the thermal deoxygenation unit;
and a water production outlet of the deaerator is connected with a heat exchange medium inlet of the heat exchanger so as to provide heat exchange and temperature rise for the seawater.
In the seawater desalination process system of the present invention, the thermal deoxygenation unit preferably further comprises a pressure reduction and temperature reduction device, and a pressure reduction valve of the temperature reduction and pressure reduction device is a multi-stage labyrinth pressure reduction valve.
In the seawater desalination process system, preferably, the heat exchanger in the ultrafiltration unit is an all-welded plate heat exchanger, and the lining heat exchange plate is made of titanium; deoxidization unit plate heat exchanger be the full-welded plate heat exchanger, inside lining heat transfer board is 316L stainless steel.
In the seawater desalination process system, the reverse osmosis membrane element is preferably a coiled plate type membrane.
The invention further provides a method for membrane-process seawater desalination by adopting the seawater desalination process system, which comprises the following steps:
1) seawater enters a self-cleaning filter through a seawater lifting pump to be filtered to remove impurities with larger particle sizes, enters a heat exchanger to be heated, oxygen-removed produced water is used for heating to 25-80 ℃, a coagulant is added after heating, and then the seawater enters an ultrafiltration membrane to be separated to remove grease and small particle size suspended matters in the incoming water, so that the turbidity of the produced water meets the requirement of entering a reverse osmosis membrane;
2) the water produced by the ultrafiltration membrane enters a water production buffer tank to be mixed with a reducing agent, and a water supply pump is used for supplying water to add a scale inhibitor and a non-oxidizing bactericide to enter a security filter; then the water enters a first-stage reverse osmosis through a reverse osmosis booster pump, and the produced water of the reverse osmosis membrane enters a reverse osmosis buffer tank; then the water enters a second-stage reverse osmosis by a reverse osmosis booster pump, the produced water of the reverse osmosis membrane enters a buffer tank, and the concentrated water returns to a produced water buffer pump; then, the water enters a third-stage reverse osmosis by a reverse osmosis booster pump, the produced water of the reverse osmosis membrane enters a reverse osmosis buffer tank, and the concentrated water enters a reverse osmosis buffer tank at the rear end of the first-stage reverse osmosis and then is treated by a second-stage reverse osmosis; then the water enters an electrodialysis device through a water supply pump of the electrodialysis unit, concentrated water enters a reverse osmosis buffer tank at the rear end of the secondary reverse osmosis and is treated by the tertiary reverse osmosis, and water produced by the electrodialysis enters a thermal deoxidization unit through the water supply pump;
(3) and (4) the water produced by electrodialysis enters a deaerator to be mixed with steam for deaerating to obtain deaerated water, and the deaerated water is used as boiler make-up water after heat exchange of a heat exchanger of the filtering unit.
In the membrane method seawater desalination method of the present invention, preferably, the coagulant in step 1) is one or more of ferric chloride, aluminum chloride, polyaluminum chloride, and aluminum chloride-polyacrylamide.
In the membrane method seawater desalination method of the invention, preferably, the filtration mode of the ultrafiltration membrane is cross-flow filtration, the concentration ratio is 1-10, and the adjustment is carried out according to the quality of inlet water.
In the membrane method seawater desalination method, preferably, the first-stage reverse osmosis recovery rate of the salt unit is 30-50%, and the generated concentrated water is discharged;
the recovery rate of the second-stage reverse osmosis of the desalting unit is 80-90%, and the generated concentrated water enters the first-stage reverse osmosis for desalting treatment;
the recovery rate of the three-stage reverse osmosis of the desalting unit is 80-90%, and the generated concentrated water enters the second-stage reverse osmosis for desalting treatment;
the recovery rate of EDI of the desalting unit is 90-95%, 70% of the generated concentrated water enters into a third-stage reverse osmosis for desalting treatment, and the rest 30% is discharged.
In the membrane method seawater desalination method of the present invention, preferably, the scale inhibitor is one of sodium hexametaphosphate, sodium tripolyphosphate, hydroxyethylidene diphosphonic acid, trimethylene phosphonic acid, ethylene diamine tetramethylene sodium phosphonate, sodium polyacrylate and hydrolyzed polymaleic acid acyl; the non-oxidizing bactericide is one of dichlorophen, dioxocyano-methane, isothiazolinone, dodecyl benzyl ammonium chloride and dodecyl dimethyl benzyl ammonium bromide.
In the membrane method seawater desalination method of the invention, preferably, the reducing agent is prepared by using secondary reverse osmosis produced water.
In the method, the seawater sequentially passes through three units of ultrafiltration, desalination and thermal deoxidization, and the produced water meets the water quality requirement of boiler make-up water. The ultrafiltration unit replaces the traditional process of sedimentation, coagulation and filtration with an inorganic ultrafiltration membrane, so that the pretreatment process flow is shortened, the pretreated water quality is ensured, and the water inlet requirement of the reverse osmosis membrane is met; the desalting unit adopts three-stage reverse osmosis and Electrodialysis (EDI) to ensure that the total hardness of produced water reaches the water quality index of boiler make-up water under the condition of large front-end water quality fluctuation; the thermal deoxygenation unit deoxygenates the water produced by the desalination unit, and the deoxygenated water heats the seawater at the front end and then enters the boiler to complete water supplement.
Compared with the prior art, the seawater desalination process system and the method have the following beneficial effects: the invention uses the ceramic ultrafiltration membrane to pretreat the seawater, saves the procedures of sedimentation and filtration, shortens the pretreatment flow, improves the long-acting large-load pollution impact resistance of the pretreatment, and adapts to the complex water quality condition at sea; the desalting unit is provided with three-stage reverse osmosis, so that the water inlet requirement of EDI is met under the condition that the front-end water quality fluctuation is large, and the whole seawater desalting system can stably operate; by integrating inorganic membrane ultrafiltration, reverse osmosis, EDI and low-energy-consumption deep deoxidation process technologies, a makeup water treatment integrated system with simple process, compact device and light weight is developed; reduce the waste liquid emission, reduce membrane equipment loss, reduce operation, fortune dimension working strength by a wide margin, guarantee that equipment is stable to be up to standard and moves. The water quality of produced water meets the requirements of GBT 12145-2016: dissolved oxygen is less than or equal to 7 mu g/L, total hardness is less than or equal to 0.01mg/L, silicon dioxide is less than or equal to 10 mu g/L, and soluble solid is less than or equal to 7000 mg/L.
Drawings
The attached drawing is a process schematic diagram of a seawater desalination process system for improving boiler make-up water in offshore oil field heavy oil thermal recovery.
In the figure, 1 is a seawater lift pump, 2 is an automatic back-flushing filter, 3 is a plate heat exchanger, 4 is a pipeline mixer, 5 is an ultrafiltration membrane system, 6 is a water production buffer tank, 7 is a reverse osmosis water supply pump, 8 is a security filter, 9 is a primary reverse osmosis booster pump, 10 is primary reverse osmosis, 11 is a reverse osmosis buffer tank, 12 is a secondary reverse osmosis booster pump, 13 is secondary reverse osmosis, 14 is a reverse osmosis buffer tank, 15 is a tertiary reverse osmosis booster pump, 16 is tertiary reverse osmosis, 17 is a reverse osmosis buffer tank, 18 is an EDI water supply pump, 19 is an EDI device, 20 is a plate heat exchanger, and 21 is a thermal deaerator.
Detailed Description
The technical solution of the present invention will be further specifically described below by way of examples.
Embodiment 1. the seawater desalination process system and the process method are applied to a certain platform of Bohai sea. The average seawater temperature was 2.1 deg.C, the average seawater turbidity was 103.4NTU, the average conductivity was 46000, and the average Total Dissolved Solids (TDS) was 31.5 g/L.
The membrane method seawater desalination process system of the heavy oil thermal recovery steam injection boiler in the offshore oil area is adopted for seawater desalination, and the specific flow is as follows:
seawater enters a self-cleaning filter through a seawater lifting pump, enters a heat exchanger after being filtered, is heated by using deoxygenated water, and is added with a coagulant of ferric chloride after being heated to 25 ℃; then the water enters an ultrafiltration membrane for treatment, the water produced by the ultrafiltration membrane enters a water production buffer tank to be mixed with a reducing agent, and the water is supplied by a water supply pump, added with sodium tripolyphosphate serving as a scale inhibitor and dodecyl benzyl ammonium chloride serving as a non-oxidizing bactericide and enters a reverse osmosis security filter; then the water enters a first-stage reverse osmosis through a high-pressure pump, and the produced water of the reverse osmosis membrane enters a buffer tank; then the water enters a secondary reverse osmosis system through a high-pressure pump, and the produced water of the reverse osmosis membrane enters a buffer tank; then the water enters a third-stage reverse osmosis system through a high-pressure pump, and the produced water of the reverse osmosis membrane enters a buffer tank; then, the water enters an EDI device through an EDI water supply pump, the EDI produced water enters a thermal deoxidization unit through the water supply pump, and the concentrated water enters a third-stage reverse osmosis unit for treatment; and (4) enabling EDI produced water to enter a deaerator to be mixed with the low-pressure steam subjected to temperature reduction and pressure reduction for deaerating to obtain boiler make-up water. The process equipment is continuously operated for 30 days, the average total hardness of the boiler make-up water is 0.005mg/L, the average value of the dissolved oxygen is 4.5 mug/L, the average value of the silicon dioxide is 5.1 mug/L, and the average value of the soluble solid is 500 mg/L.
The membrane method seawater desalination process system of the offshore oil field heavy oil thermal recovery steam injection boiler is adopted for seawater desalination treatment, and the treatment steps are as follows:
seawater enters a self-cleaning filter through a seawater lifting pump, enters a heat exchanger after being filtered, is heated by using deoxygenated water, and is added with a coagulant of ferric chloride after being heated to 30 ℃; then the water enters an ultrafiltration membrane for treatment, the water produced by the ultrafiltration membrane enters a water production buffer tank to be mixed with a reducing agent, and the water is supplied by a water supply pump, added with sodium tripolyphosphate serving as a scale inhibitor and dodecyl benzyl ammonium chloride serving as a non-oxidizing bactericide and enters a reverse osmosis security filter; then the water enters a first-stage reverse osmosis through a high-pressure pump, and the produced water of the reverse osmosis membrane enters a buffer tank; then the water enters a secondary reverse osmosis system through a high-pressure pump, and the produced water of the reverse osmosis membrane enters a buffer tank; then the water enters a third-stage reverse osmosis system through a high-pressure pump, and the produced water of the reverse osmosis membrane enters a buffer tank; then, the water enters an EDI device through an EDI water supply pump, the EDI produced water enters a thermal deoxidization unit through the water supply pump, and the concentrated water enters a third-stage reverse osmosis unit for treatment; and (4) enabling EDI produced water to enter a deaerator to be mixed with the low-pressure steam subjected to temperature reduction and pressure reduction for deaerating to obtain boiler make-up water. The process equipment continuously runs for 30 days, the average total hardness of the boiler make-up water is 0.004mg/L, the average value of the dissolved oxygen is 3.8 mug/L, the average value of the silicon dioxide is 4.2 mug/L, and the average value of the soluble solid is 550 mg/L.
Seawater enters a self-cleaning filter through a seawater lifting pump, enters a heat exchanger after being filtered, is heated by using deoxygenated water, and is added with a coagulant of polyaluminium chloride after being heated to 35 ℃; then the water enters an ultrafiltration membrane for treatment, the water produced by the ultrafiltration membrane enters a water production buffer tank to be mixed with a reducing agent, and the water is supplied by a water supply pump, added with sodium tripolyphosphate serving as a scale inhibitor and dodecyl benzyl ammonium chloride serving as a non-oxidizing bactericide and enters a reverse osmosis security filter; then the water enters a first-stage reverse osmosis through a high-pressure pump, and the produced water of the reverse osmosis membrane enters a buffer tank; then the water enters a secondary reverse osmosis system through a high-pressure pump, and the produced water of the reverse osmosis membrane enters a buffer tank; then the water enters a third-stage reverse osmosis system through a high-pressure pump, and the produced water of the reverse osmosis membrane enters a buffer tank; then, the water enters an EDI device through an EDI water supply pump, the EDI produced water enters a thermal deoxidization unit through the water supply pump, and the concentrated water enters a third-stage reverse osmosis unit for treatment; and (4) enabling EDI produced water to enter a deaerator to be mixed with the low-pressure steam subjected to temperature reduction and pressure reduction for deaerating to obtain boiler make-up water. The process equipment is continuously operated for 30 days, the average total hardness of the boiler make-up water is 0.004mg/L, the average value of the dissolved oxygen is 3.6 mug/L, the average value of the silicon dioxide is 4.5 mug/L, and the average value of the soluble solid is 600 mg/L.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (10)
1. A seawater desalination process system for providing boiler make-up water for offshore oil field heavy oil thermal recovery is characterized by comprising an ultrafiltration unit, a desalination unit and a thermal deoxygenation unit which are sequentially connected,
the device comprises an ultrafiltration unit, a heat exchanger, a pipeline coagulation device and a heat exchanger, wherein the ultrafiltration unit comprises a seawater lift pump, a self-cleaning filter, a plate heat exchanger, a pipeline coagulation device and an ultrafiltration membrane which are sequentially connected, and the ultrafiltration membrane is a ceramic ultrafiltration membrane;
the desalting unit comprises a water production buffer tank, a reverse osmosis water supply pump, a cartridge filter, a three-stage reverse osmosis unit and an electrodialysis unit which are connected in sequence; the three-stage reverse osmosis unit comprises a first-stage reverse osmosis unit, a second-stage reverse osmosis unit and a third-stage reverse osmosis unit, wherein the front end of each stage of reverse osmosis unit is provided with a reverse osmosis booster pump, and the rear end of each stage of reverse osmosis unit is connected with a reverse osmosis buffer tank; wherein the concentrated water outlet of the second-stage reverse osmosis is connected with the inlet of the water production buffer tank, and the concentrated water outlet of the electrodialysis unit is connected with the reverse osmosis buffer tank arranged at the rear end of the second-stage reverse osmosis so as to enter the third-stage reverse osmosis for desalination treatment;
the thermal deoxygenation unit comprises a plate heat exchanger and a deoxygenator;
the ultrafiltration membrane of the ultrafiltration unit is connected with the produced water buffer tank of the desalination unit, and the reverse osmosis buffer tank at the rear end of the third-stage reverse osmosis of the desalination unit is connected with the plate heat exchanger of the thermal deoxygenation unit;
and a water production outlet of the deaerator is connected with a heat exchange medium inlet of a plate heat exchanger of the ultrafiltration unit to provide heat exchange and temperature rise for seawater.
2. The seawater desalination process system of claim 1, wherein the thermal deoxygenation unit further comprises a pressure-reducing and temperature-reducing device, and a pressure-reducing valve of the temperature-reducing and pressure-reducing device is a multi-stage labyrinth pressure-reducing valve.
3. The seawater desalination process system of claim 1, wherein the plate heat exchanger in the ultrafiltration unit is an all-welded plate heat exchanger, and the inner lining heat exchange plate is made of titanium; deoxidization unit plate heat exchanger be the full-welded plate heat exchanger, inside lining heat transfer board is 316L stainless steel.
4. The seawater desalination process system of claim 1, wherein the membrane element of reverse osmosis is a rolled sheet membrane.
5. The method for membrane-process seawater desalination by a seawater desalination process system as claimed in claim 1, which comprises the following steps:
1) seawater enters a self-cleaning filter through a seawater lifting pump to be filtered to remove impurities with larger particle sizes, enters a heat exchanger to be heated, oxygen-removed produced water is used for heating to 25-80 ℃, a coagulant is added after heating, and then the seawater enters an ultrafiltration membrane to be separated to remove grease and small particle size suspended matters in the incoming water, so that the turbidity of the produced water meets the requirement of entering a reverse osmosis membrane;
2) the water produced by the ultrafiltration membrane enters a water production buffer tank to be mixed with a reducing agent, and a water supply pump is used for supplying water to add a scale inhibitor and a non-oxidizing bactericide to enter a security filter; then the water enters a first-stage reverse osmosis through a reverse osmosis booster pump, and the produced water of the reverse osmosis membrane enters a reverse osmosis buffer tank; then the water enters a second-stage reverse osmosis by a reverse osmosis booster pump, the produced water of the reverse osmosis membrane enters a buffer tank, and the concentrated water returns to a produced water buffer pump; then, the water enters a third-stage reverse osmosis by a reverse osmosis booster pump, the produced water of the reverse osmosis membrane enters a reverse osmosis buffer tank, and the concentrated water enters a reverse osmosis buffer tank at the rear end of the first-stage reverse osmosis and then is treated by a second-stage reverse osmosis; then the water enters an electrodialysis device through a water supply pump of the electrodialysis unit, concentrated water enters a reverse osmosis buffer tank at the rear end of the secondary reverse osmosis and is treated by the tertiary reverse osmosis, and water produced by the electrodialysis enters a thermal deoxidization unit through the water supply pump;
(3) and (4) the water produced by electrodialysis enters a deaerator to be mixed with steam for deaerating to obtain deaerated water, and the deaerated water is used as boiler make-up water after heat exchange of a plate heat exchanger of the filtering unit.
6. The method according to claim 5, wherein the coagulant in step 1) is one or more of ferric chloride, aluminum chloride, polyaluminum chloride and aluminum chloride-polyacrylamide.
7. The method according to claim 5, wherein the ultrafiltration membrane is subjected to cross-flow filtration at a concentration ratio of 1-10, and the concentration ratio is adjusted according to the quality of the feed water.
8. The method of claim 5, wherein the primary reverse osmosis recovery of the desalination unit is 30-50% and the produced concentrate is discharged;
the recovery rate of the second-stage reverse osmosis of the desalting unit is 80-90%, and the generated concentrated water enters the first-stage reverse osmosis for desalting treatment;
the recovery rate of the three-stage reverse osmosis of the desalting unit is 80-90%, and the generated concentrated water enters the second-stage reverse osmosis for desalting treatment;
the recovery rate of EDI of the desalting unit is 90-95%, 70% of the generated concentrated water enters into a third-stage reverse osmosis for desalting treatment, and the rest 30% is discharged.
9. The method of claim 1, wherein the scale inhibitor is one of sodium hexametaphosphate, sodium tripolyphosphate, hydroxyethylidene diphosphonic acid, trimethylene phosphonic acid, sodium ethylene diamine tetramethylene phosphonate, sodium polyacrylate, hydrolyzed polymaleic acid; the non-oxidizing bactericide is one of dichlorophen, dioxocyano-methane, isothiazolinone, dodecyl benzyl ammonium chloride and dodecyl dimethyl benzyl ammonium bromide.
10. The method of claim 1, wherein the reducing agent is formulated using secondary reverse osmosis produced water.
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| CN202011602738.7A CN112794537A (en) | 2020-12-29 | 2020-12-29 | Seawater desalination process system for providing boiler make-up water for offshore oil field heavy oil thermal recovery |
| PCT/CN2021/139828 WO2022143272A1 (en) | 2020-12-29 | 2021-12-20 | Seawater desalination process system for supplying boiler supplemental water for thermal recovery of heavy oil in offshore oil fields |
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| WO2022143272A1 (en) * | 2020-12-29 | 2022-07-07 | 中海油天津化工研究设计院有限公司 | Seawater desalination process system for supplying boiler supplemental water for thermal recovery of heavy oil in offshore oil fields |
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| CN115947415A (en) * | 2023-01-17 | 2023-04-11 | 西安热工研究院有限公司 | Automatic start-stop control system and method for two-stage reverse osmosis and EDI device |
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