CN104326613A - Oil field sewage treatment system based on trough collecting solar energy - Google Patents
Oil field sewage treatment system based on trough collecting solar energy Download PDFInfo
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- CN104326613A CN104326613A CN201410588664.4A CN201410588664A CN104326613A CN 104326613 A CN104326613 A CN 104326613A CN 201410588664 A CN201410588664 A CN 201410588664A CN 104326613 A CN104326613 A CN 104326613A
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- 239000010865 sewage Substances 0.000 title claims abstract description 140
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 238000005338 heat storage Methods 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000013505 freshwater Substances 0.000 claims description 93
- 238000010521 absorption reaction Methods 0.000 claims description 12
- 238000001704 evaporation Methods 0.000 claims description 12
- 230000008020 evaporation Effects 0.000 claims description 12
- 239000010408 film Substances 0.000 claims description 12
- 238000007872 degassing Methods 0.000 claims description 6
- 239000011552 falling film Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 239000002455 scale inhibitor Substances 0.000 claims 2
- 239000000446 fuel Substances 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract 5
- 230000000295 complement effect Effects 0.000 abstract 1
- 239000012141 concentrate Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 23
- 239000000243 solution Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010170 biological method Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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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
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to an oil field sewage treatment system based on trough collecting solar energy. The system comprises a trough collecting lens field, a heat collecting pipe and a sewage treatment system, wherein a to-be-heated heat adsorption medium enters the heat collecting pipe from an inlet of the heat collecting pipe; the trough collecting lens field which tracks solar energy in real time concentrate collected sunlight on the heat collecting pipe; the heat adsorption medium flows in the heat collecting pipe, is continuously heated and finally becomes a high-temperature adsorption medium which flows out from an outlet of the heat collecting pipe; the high-temperature adsorption medium enters the adsorption medium-water exchanger to exchange heat with water to obtain stream; and the obtained steam enters a sewage treatment system for carrying out a sewage treatment process. The oil field sewage treatment system based on trough collecting solar energy provided by the invention is used for generating steam for sewage treatment by concentrating solar energy. The system with a heat storage system can be used for continuously generating steam after sunset, and thus the operating time is long. Meanwhile, solar energy can be complementary with normal fuel to sustain the operation of the system, so that the sewage treatment efficiency is high and the system is energy-saving, environment-friendly and free of pollution.
Description
Technical Field
The invention relates to the field of oilfield sewage treatment, in particular to an oilfield sewage treatment system based on trough type concentrating solar energy.
Background
Most of oil fields in China are developed by water injection, and after the oil field development enters a high water-cut stage, the water content of produced liquid in the oil field is as high as 70 percent, and some of the produced liquid even exceeds 90 percent, so that the situations of large liquid yield, large oil-containing sewage, large water injection amount and high energy consumption are generated. The existing united station and transfer station in the oil field are in overload operation, the treated water quality is difficult to reach the standard, the pressure of a sewage reinjection stratum is increased, and the energy consumption is increased. When the oil field is serious, the reinjection process fails, and the realization of the stable yield and the high yield of the oil field is directly influenced. In addition, due to the increase of the water content of the produced liquid, the treated sewage cannot be completely reinjected into the stratum, and a large amount of oily sewage needs to be treated to reach the standard and then can be discharged. According to statistics, 3.5t of water is generated every 1t of crude oil is produced, or about 4.5t of water is injected to replace 1t of crude oil, as more oil fields enter the middle and later periods of exploitation, the water content is continuously increased, more sewage is generated, and more water must be injected into the stratum at the same time.
Oilfield flooding development brings two major problems: firstly, the problem of water source of injected water is that people hope to obtain a water source which can provide large and stable water supply amount, the water source of water injection at the initial stage of water injection development of the oil field is solved by exploiting shallow underground water or surface water, and excessive exploitation of clear water can cause the water level of a local stratum to be reduced, thereby influencing the ecological environment; secondly, the water content of crude oil is continuously increased, the amount of oily sewage is increased, the discharge and treatment of sewage are big problems, and the unreasonable discharge of a large amount of oily sewage can cause the subsurface invasion of a receiving water body and pollute the ecological environment. Therefore, the advanced treatment and reuse of oil field sewage is not only an urgent need for environmental protection, but also an urgent need for oil field production.
At present, the sewage treatment technology of each oil field has strong pertinence and the effect of the treatment technology is not ideal, and the sewage treatment methods commonly used in domestic and foreign oil fields can be roughly divided into three types: physical, chemical and biological methods. The traditional process, technology and equipment have low treatment efficiency, large engineering investment and high treatment cost, and can not meet the water quality index of drainage, not meet the requirement of oil field sewage treatment and not meet the water quality requirement of produced water reinjection stratum.
Disclosure of Invention
The invention aims to overcome the defects of low efficiency, high energy consumption and high cost in the prior art, and provides an oil field sewage treatment system based on trough type concentrating solar energy.
In order to achieve the above object, the present invention provides an oilfield sewage treatment system based on trough-type concentrated solar energy, comprising: the system comprises a groove type condenser field 1, a heat collecting pipe 2, a thermal power vapor compressor 10, a first evaporator group 13, a second evaporator group 14, a condenser 20, a fresh water tank 22 and a sewage tank 23; a plurality of evaporators are included in the first evaporator group 13 or the second evaporator group 14; wherein,
fresh water 12 enters the heat collecting tube 2 from the inlet of the heat collecting tube 2, the groove type condenser field 1 which tracks the sun in real time focuses the collected sunlight onto the heat collecting tube 2, the fresh water 12 flows in the heat collecting tube 2 and is continuously heated, and finally, the fresh water is changed into raw steam 9 and flows out from the outlet of the heat collecting tube 2; the raw steam 9 firstly flows into the thermal steam compressor 10, the thermal steam compressor 10 takes the raw steam 9 as power, and compresses the low-pressure steam 17 extracted from one or more evaporators or condensers 20 in the first evaporator group 13 and the second evaporator group 14 to ensure that the pressure of the low-pressure steam is increased to a certain degree, so that pressurized steam 11 is generated and is input into the first evaporator group 13;
the oil field sewage from the sewage tank 23 is pretreated and then enters the condenser 20 through the pump for preheating and degassing, the sewage 19 is changed into the sewage 19 after adding the antisludging agent, the sewage 19 is uniformly distributed on the top discharge pipe of the second evaporator group 14 through the nozzle and then flows downwards along the top discharge pipe in a film form, part of the sewage enters the first evaporator group 13 along the sewage pipeline 15 between the evaporators and flows downwards along the top discharge pipe in the first evaporator group 13 in the film form; the pressurized steam 11 from the thermal steam compressor 10 first enters the first evaporator group 13 and is condensed in the evaporator tubes of the first evaporator group 13 into fresh water 25, which flows into the fresh water header 18; a part of the sewage in the first evaporator group 13 absorbs latent heat of condensed steam in the evaporation pipes of the first evaporator group 13 to evaporate, the generated regenerated steam 16 enters the evaporation pipes of the second evaporator group 14 and is condensed into fresh water 25 in the pipes, the fresh water 25 flows into the fresh water collecting pipe 18, meanwhile, a part of the sewage in the second evaporator group 14 absorbs latent heat of the condensed steam in the pipes to evaporate, and the generated regenerated steam enters the condenser 20; the regenerated steam preheats and degasses the oilfield sewage from the sewage tank 23 in the condenser 20, the condensed water in the condenser 20 flows into the fresh water collecting pipe 18, the fresh water collecting pipe 18 stores the fresh water in the fresh water tank 22, and the unevaporated sewage flows out in the first evaporator 13 to be the concentrated sewage 21 and is discharged.
In the above technical solution, the steam generator further comprises an auxiliary boiler 24, wherein the auxiliary boiler 24 is located on a pipeline for transmitting the raw steam 9, and is used for generating the raw steam 9 or further heating the existing raw steam 9.
In the above technical solution, there are one or more fresh water tanks 22 and one or more sewage tanks 23.
In the above technical solution, the evaporators in the first evaporator group 13 or the second evaporator group 14 are horizontal tube falling film evaporators or vertical tube falling film evaporators; each evaporator in the first evaporator group 13 has a higher operating temperature than each evaporator in the second evaporator group 14, and each evaporator in the first evaporator group 13 has a higher operating pressure than each evaporator in the second evaporator group 14; each evaporator in a single evaporator group has the same operating temperature and operating pressure.
In the above technical solution, the system further includes: a heat absorption medium-water heat exchanger 8; wherein,
a heat absorbing medium 3 enters the heat collecting tube 2 from an inlet of the heat collecting tube 2, the groove type condenser field 1 which tracks the sun in real time focuses the collected sunlight onto the heat collecting tube 2, the heat absorbing medium 3 keeps flowing in the heat collecting tube 2 and is continuously heated, and the heat absorbing medium 3 in a high-temperature state flows out from an outlet of the heat collecting tube 2; the heat absorbing medium 3 in a high-temperature state enters a heat absorbing medium-water heat exchanger 8 to exchange heat with fresh water 12, so that raw steam 9 is generated; the heat absorbing medium 3 after heat exchange is changed back to a low temperature state and returns to the groove type condenser field 1 and the heat collecting pipe 2 from the heat absorbing medium-water heat exchanger 8 for circulation;
the raw steam 9 flows into the thermal steam compressor 10, the thermal steam compressor 10 uses the raw steam 9 as power to compress low-pressure steam 17 extracted from one or more evaporators or condensers 20 in the first evaporator group 13 and the second evaporator group 14, so that the pressure of the low-pressure steam is increased to a certain degree, and pressurized steam 11 is generated and is input into the first evaporator group 13;
the oil field sewage from the sewage tank 23 is pretreated and then enters the condenser 20 through the pump for preheating and degassing, the sewage 19 is changed into the sewage 19 after adding the antisludging agent, the sewage 19 is uniformly distributed on the top discharge pipe of the second evaporator group 14 through the nozzle and then flows downwards along the top discharge pipe in a film form, part of the sewage enters the first evaporator group 13 along the sewage pipeline 15 between the evaporators, and also flows downwards along the top discharge pipe in the first evaporator group 13 in a film form; the pressurized steam 11 from the thermal steam compressor 10 firstly enters the first evaporator group 13 and is condensed into fresh water 25 in the evaporator pipes of the first evaporator group 13, wherein one part of the fresh water 12 of the fresh water 25 returns to the heat absorption medium-water heat exchanger 8 for circulation to generate the raw steam 9, and the other part of the fresh water flows into the fresh water collecting pipe 18; a part of the sewage in the first evaporator group 13 absorbs latent heat of condensed steam in the evaporation pipes of the first evaporator group 13 to evaporate, the generated regenerated steam 16 enters the evaporation pipes of the second evaporator group 14 and is condensed into fresh water 25 in the pipes, the fresh water 25 flows into the fresh water collecting pipe 18, meanwhile, a part of the sewage in the second evaporator group 14 absorbs latent heat of the condensed steam in the pipes to evaporate, and the generated regenerated steam enters the condenser 20; the regenerated steam preheats and degasses the oilfield sewage from the sewage tank 23 in the condenser 20, the condensed water in the condenser 20 flows into the fresh water collecting pipe 18, the fresh water collecting pipe 18 stores the fresh water in the fresh water tank 22, and the unevaporated sewage flows out in the first evaporator 13 to be the concentrated sewage 21 and is discharged.
In the above technical scheme, the heat absorption medium flow and the water flow of the heat absorption medium-water heat exchanger 8 can be adjusted by an adjusting valve or a variable frequency pump, so as to adjust the parameters of the raw steam 9 at the outlet of the heat absorption medium-water heat exchanger 8.
In the technical scheme, the system also comprises a heat absorbing medium-heat storage medium heat exchanger 4, a high-temperature heat storage tank 5 and a low-temperature heat storage tank 6; wherein,
the heat absorbing medium 3 in a low temperature state enters the heat collecting tube 2 from the inlet of the heat collecting tube 2, the groove type condenser field 1 which tracks the sun in real time focuses the collected sunlight onto the heat collecting tube 2, the heat absorbing medium 3 flows in the heat collecting tube 2 and is continuously heated, and the heat absorbing medium 3 in a high temperature state flows out from the outlet of the heat collecting tube 2; on one hand, the heat-absorbing medium 3 in a high-temperature state directly enters the heat-absorbing medium-water heat exchanger 8, and exchanges heat with fresh water 12 in the heat-absorbing medium-water heat exchanger 8 to generate raw steam 9, the raw steam 9 enters the thermal steam compressor 10 and carries out a subsequent sewage treatment process, and the heat-absorbing medium 3 after heat exchange returns to a low-temperature state and returns to the heat-collecting pipe 2 from the heat-absorbing medium-water heat exchanger 8 for circulation; on the other hand, the heated heat absorbing medium 3 enters the heat absorbing medium-heat storing medium heat exchanger 4 to exchange heat with the heat storing medium 7 from the low-temperature heat storing tank 6, the heat storing medium 7 enters the high-temperature heat storing tank 5 to store heat after being heated, the heat absorbing medium 3 participating in heat exchange returns to the heat collecting pipe 2 to circulate, when the sun falls on a mountain, the heat storing medium 7 in a high-temperature state from the high-temperature heat storing tank 5 and the heat absorbing medium 3 in a low-temperature state exchange heat through the heat absorbing medium-heat storing medium heat exchanger 4 to generate the heat absorbing medium 3 in a high-temperature state, the heat absorbing medium 3 in the high-temperature state enters the heat absorbing medium-water heat exchanger 8 to exchange heat with water 12, and generated steam 9 enters the thermal steam compressor 10 to.
In the above technical solution, the system further includes a plurality of evaporator groups, and the plurality of evaporator groups are cascaded with the first evaporator group 13 and the second evaporator group 14; different evaporator groups have different operating temperatures and pressures, the operating temperature and pressure of the previous evaporator group are higher than the operating temperature and pressure of the next evaporator group, and the evaporators in the same evaporator group have the same operating temperature and pressure.
In the above technical solution, the high temperature heat storage tank 5 and the low temperature heat storage tank 6 are respectively provided with one or more than one.
The invention has the advantages that:
the oilfield sewage treatment system based on the trough type concentrating solar energy utilizes solar energy to generate steam required by oilfield sewage treatment, can continuously generate steam after the sun falls into the mountain with the heat storage system, has long operation time, has the characteristics of energy conservation, environmental protection and no pollution, and can also complementarily operate with conventional fuels.
Drawings
FIG. 1 is a schematic diagram of an oilfield wastewater treatment system based on trough-type concentrated solar energy according to an embodiment of the invention;
FIG. 2 is a schematic diagram of another embodiment of the present invention of a trough-type concentrated solar-based oilfield wastewater treatment system;
FIG. 3 is a schematic diagram of an oilfield wastewater treatment system based on trough-type concentrated solar energy according to yet another embodiment of the present invention;
description of the drawings
1-groove type condenser field 2 heat collecting tube
3 heat absorbing medium 4 heat absorbing medium-heat storage medium heat exchanger
5 high-temperature heat storage tank 6 low-temperature heat storage tank
7 heat storage medium 8 heat absorption medium-water heat exchanger
9 raw steam 10 thermal steam compressor
11 steam 12 fresh water
13. 14, … …, n 15 evaporator inter-evaporator sewage pipes
16 regeneration steam 17 extraction steam
18 fresh water collecting pipe 19 treated sewage
20 condenser 21 concentrated sewage
22 fresh water tank and 23 sewage tank
24 auxiliary boiler 25 fresh water
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Fig. 1 is an embodiment of an oilfield sewage treatment system based on trough-type concentrated solar energy according to the present invention, which includes a trough-type condenser field 1, a heat collecting pipe 2, a thermal vapor compressor 10, an auxiliary boiler 24, a first evaporator group 13, a second evaporator group 14, a condenser 20, a fresh water tank 22, and a sewage tank 23; wherein, a plurality of evaporators are included in the first evaporator group 13 or the second evaporator group 14; fresh water 12 enters the heat collecting tube 2 from the inlet of the heat collecting tube 2, the groove type condenser field 1 which tracks the sun in real time focuses the collected sunlight onto the heat collecting tube 2, the fresh water 12 flows in the heat collecting tube 2 and is continuously heated, and finally, the fresh water is changed into raw steam 9 and flows out from the outlet of the heat collecting tube 2; the raw steam 9 firstly flows into the thermal steam compressor 10, the thermal steam compressor 10 takes the raw steam 9 as power, and compresses the low-pressure steam 17 extracted from one or more evaporators or condensers 20 in the first evaporator group 13 and the second evaporator group 14 to ensure that the pressure of the low-pressure steam is increased to a certain degree, so that pressurized steam 11 is generated and is input into the first evaporator group 13;
the oil field sewage from the sewage tank 23 is pretreated and then enters the condenser 20 through the pump for preheating and degassing, the sewage 19 is changed into the sewage 19 after adding the antisludging agent, the sewage 19 is uniformly distributed on the top discharge pipe of the second evaporator group 14 through the nozzle and then flows downwards along the top discharge pipe in a film form, part of the sewage enters the first evaporator group 13 along the sewage pipeline 15 between the evaporators, and also flows downwards along the top discharge pipe in the first evaporator group 13 in a film form; the pressurized steam 11 from the thermal steam compressor 10 first enters the first evaporator group 13 and is condensed in the evaporator tubes of the first evaporator group 13 into fresh water 25, which flows into the fresh water header 18; a part of the sewage in the first evaporator group 13 absorbs latent heat of condensed steam in the evaporation pipes of the first evaporator group 13 to evaporate, the generated regenerated steam 16 enters the evaporation pipes of the second evaporator group 14 and is condensed into fresh water 25 in the pipes, the fresh water 25 flows into the fresh water collecting pipe 18, meanwhile, a part of the sewage in the second evaporator group 14 absorbs latent heat of the condensed steam in the pipes to evaporate, and the generated regenerated steam enters the condenser 20; the regenerated steam preheats and degasses the oilfield sewage from the sewage tank 23 in the condenser 20, the condensed water in the condenser 20 flows into the fresh water collecting pipe 18, the fresh water collecting pipe 18 stores the fresh water in the fresh water tank 22, and the unevaporated sewage flows out in the first evaporator 13 to be the concentrated sewage 21 and is discharged.
The inlet of the heat collecting pipe 2 is provided with a variable frequency pump or a regulating valve for regulating the flow of the water 12, further regulating the parameters of the raw steam 9, such as the flow, the temperature, the pressure and the like of the raw steam 9, and realizing the purpose of energy conservation.
The auxiliary boiler 24 is located on the pipeline for transporting the raw steam 9 and is used for generating the raw steam 9 or further heating the existing raw steam 9. The auxiliary boiler 24 may be a coal-fired boiler, an oil-fired boiler, a gas-fired boiler, a waste heat (exhaust heat) boiler, or the like. If the solar radiation is insufficient, so that the parameters of the raw steam 9 coming out of the outlet of the heat collecting pipe 2 cannot meet the requirements of oil field sewage treatment, the raw steam 9 can be continuously heated by the auxiliary boiler 24, so as to improve the parameters of the raw steam 9, such as temperature, pressure and the like; the auxiliary boiler 24 may also maintain continuous production of raw steam 9 after sunset. Of course, in other embodiments, the system for treating oilfield sewage based on trough-type concentrated solar energy of the present invention may not include an auxiliary boiler, which is helpful for reducing the cost.
The fresh water tank 22 and the sewage tank 23 are used for storing fresh water and sewage, respectively, and may be one or more.
The thermodynamic vapor compressor 10 uses vapor with a certain pressure as power to compress low-pressure vapor, so that the pressure of the low-pressure vapor is raised to a certain degree, and the device for recycling the low-pressure vapor has two functions: firstly, a part of regenerated steam is pumped back, so that the heat efficiency of the system is improved; and secondly, the vacuum of the system is improved and maintained during steam extraction, the flow of the steam to the subsequent evaporator group is accelerated, and the water production capacity of the subsequent evaporator group is improved.
The evaporators in the first evaporator group 13 or the second evaporator group 14 are horizontal tube falling-film evaporators or vertical tube falling-film evaporators. Each evaporator in the first evaporator group 13 has a higher operating temperature than each evaporator in the second evaporator group 14, and each evaporator in the first evaporator group 13 has a higher operating pressure than each evaporator in the second evaporator group 14, but each evaporator in a single evaporator group has the same operating temperature and pressure.
The number of evaporator groups, the operation parameters, the number of thermal vapor compressors 10, the extraction position, and the parameters may be determined according to the amount of sewage to be treated, the economy of sewage treatment, and the like, and are not limited to those described in the embodiment.
Fig. 2 is another embodiment of the oilfield sewage treatment system based on trough-type concentrating solar energy according to the present invention, which includes a trough-type concentrating mirror field 1, a heat collecting pipe 2, a heat absorbing medium-water heat exchanger 8, a thermal vapor compressor 10, a first evaporator group 13, a second evaporator group 14, a condenser 20, a fresh water tank 22, and a sewage tank 23; the heat absorbing medium 3 enters the heat collecting tube 2 from the inlet of the heat collecting tube 2, the groove type condenser field 1 which tracks the sun in real time focuses the collected sunlight onto the heat collecting tube 2, the heat absorbing medium 3 keeps flowing in the heat collecting tube 2 and is continuously heated, and the heat absorbing medium 3 in a high-temperature state flows out from the outlet of the heat collecting tube 2; the heat absorbing medium 3 in a high-temperature state enters a heat absorbing medium-water heat exchanger 8 to exchange heat with fresh water 12, so that raw steam 9 is generated, and the raw steam 9 enters a thermal steam compressor 10 to perform a subsequent sewage treatment process; the heat absorbing medium 3 after heat exchange is changed back to a low temperature state and returns to the groove type condenser field 1 and the heat collecting pipe 2 from the heat absorbing medium-water heat exchanger 8 for circulation;
the raw steam 9 flows into the thermal steam compressor 10, the thermal steam compressor 10 uses the raw steam 9 as power to compress low-pressure steam 17 extracted from one or more evaporators or condensers 20 in the first evaporator group 13 and the second evaporator group 14, so that the pressure of the low-pressure steam is increased to a certain degree, and pressurized steam 11 is generated and is input into the first evaporator group 13;
the oil field sewage from the sewage tank 23 is pretreated and then enters the condenser 20 through the pump for preheating and degassing, the sewage 19 is changed into the sewage 19 after adding the antisludging agent, the sewage 19 is uniformly distributed on the top discharge pipe of the second evaporator group 14 through the nozzle and then flows downwards along the top discharge pipe in a film form, part of the sewage enters the first evaporator group 13 along the sewage pipeline 15 between the evaporators, and also flows downwards along the top discharge pipe in the first evaporator group 13 in a film form; the pressurized steam 11 from the thermal steam compressor 10 firstly enters the first evaporator group 13 and is condensed into fresh water 25 in the evaporator pipes of the first evaporator group 13, wherein one part of the fresh water 12 of the fresh water 25 returns to the heat absorption medium-water heat exchanger 8 for circulation to generate the raw steam 9, and the other part of the fresh water flows into the fresh water collecting pipe 18; a part of the sewage in the first evaporator group 13 absorbs latent heat of condensed steam in the evaporation pipes of the first evaporator group 13 to evaporate, the generated regenerated steam 16 enters the evaporation pipes of the second evaporator group 14 and is condensed into fresh water 25 in the pipes, the fresh water 25 flows into the fresh water collecting pipe 18, meanwhile, a part of the sewage in the second evaporator group 14 absorbs latent heat of the condensed steam in the pipes to evaporate, and the generated regenerated steam enters the condenser 20; the regenerated steam preheats and degasses the oilfield sewage from the sewage tank 23 in the condenser 20, the condensed water in the condenser 20 flows into the fresh water collecting pipe 18, the fresh water collecting pipe 18 stores the fresh water in the fresh water tank 22, and the unevaporated sewage flows out in the first evaporator 13 to be the concentrated sewage 21 and is discharged.
The heat absorption medium flow and the water flow of the heat absorption medium-water heat exchanger 8 can be adjusted by an adjusting valve or a variable frequency pump, so as to adjust the parameters of the raw steam 9 at the outlet of the heat absorption medium-water heat exchanger 8.
The heat absorbing medium 3 can be heat conducting oil, molten salt, air or solid particles and the like.
Fig. 3 is a further embodiment of the oilfield sewage treatment system based on trough-type concentrating solar energy according to the present invention, which includes a trough-type concentrating mirror field 1, a heat collecting pipe 2, a heat absorbing medium-heat storing medium heat exchanger 4, a high-temperature heat storing tank 5, a low-temperature heat storing tank 6, a heat absorbing medium-water heat exchanger 8, a plurality of evaporator groups, a condenser 20, a fresh water tank 22, and a sewage tank 23; the heat-absorbing medium 3 in a low-temperature state enters the heat-collecting tube 2 from the inlet of the heat-collecting tube 2, the groove-type condenser field 1 which tracks the sun in real time focuses the collected sunlight onto the heat-collecting tube 2, the heat-absorbing medium 3 flows in the heat-collecting tube 2 and is continuously heated, and the heat-absorbing medium 3 in a high-temperature state flows out from the outlet of the heat-collecting tube 2; on one hand, the heat absorbing medium 3 in a high temperature state can directly enter the heat absorbing medium-water heat exchanger 8, and exchanges heat with fresh water 12 in the heat absorbing medium-water heat exchanger 8 to generate raw steam 9, the raw steam 9 enters the thermal steam compressor 10 and carries out a subsequent sewage treatment process (the subsequent sewage treatment process is basically the same as that in the embodiment shown in fig. 2), the heat absorbing medium 3 after heat exchange returns to a low temperature state, and returns to the heat collecting pipe 2 from the heat absorbing medium-water heat exchanger 8 for circulation; on the other hand, the heated heat absorbing medium 3 enters the heat absorbing medium-heat storing medium heat exchanger 4 to exchange heat with the heat storing medium 7 from the low-temperature heat storing tank 6, the heat storing medium 7 enters the high-temperature heat storing tank 5 to store heat after being heated, the heat absorbing medium 3 participating in heat exchange returns to the heat collecting pipe 2 to circulate, when the sun falls on a mountain, the heat storing medium 7 in a high-temperature state from the high-temperature heat storing tank 5 and the heat absorbing medium 3 in a low-temperature state exchange heat through the heat absorbing medium-heat storing medium heat exchanger 4 to generate the heat absorbing medium 3 in a high-temperature state, the heat absorbing medium 3 in the high-temperature state enters the heat absorbing medium-water heat exchanger 8 to exchange heat with water 12, and generated steam 9 enters the thermal steam compressor 10 to.
In this embodiment, the plurality of evaporator groups include: a first evaporator group 13, a second evaporator group 14, … …, an nth evaporator group n; the number x, x of the plurality of evaporator groups satisfies: x is more than or equal to 2 and less than or equal to 14, each evaporator group has different operating temperature and pressure, the operating temperature and pressure of the previous evaporator group are higher than the operating temperature and pressure of the next evaporator group, and the same evaporator group has the same operating temperature and pressure;
the high temperature thermal storage tank 5 and the low temperature thermal storage tank 6 are used to realize the storage of heat, and they generally have different design heat storage temperatures. The number of the high-temperature heat storage tanks 5 and the number of the low-temperature heat storage tanks 6 can be one or more, and when a plurality of high-temperature heat storage tanks 5 exist, the designed heat storage temperature of each high-temperature heat storage tank 5 can be the same or different; when there are a plurality of low temperature heat storage tanks 6, the design heat storage temperature of each low temperature heat storage tank 6 may be different or different. The heat stored in the high-temperature heat storage tank 5 and the low-temperature heat storage tank 6 can realize continuous steam generation of the system after the sun falls, and the high-temperature heat storage tank 5 and the low-temperature heat storage tank 6 with large capacity can realize continuous steam generation in 24 hours of the system. In addition, the use of the high temperature heat storage tank 5 and the low temperature heat storage tank 6 also helps to stabilize the parameters of the generated steam 9 generated by the heat absorbing medium-water heat exchanger 8, avoiding the disadvantage that the parameters of the generated steam 9 generated by the system in the embodiment shown in fig. 1 fluctuate greatly with solar radiation.
The heat absorbing medium 3 can be heat conducting oil, molten salt, air or solid particles and the like.
The heat storage medium 7 is molten salt, sand or other materials with low cost and good heat storage effect. The use of a heat storage medium 7 in this embodiment helps to reduce the heat storage cost of the overall system compared to the system in the embodiment shown in fig. 1 and 2.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides an oil field sewage treatment system based on slot type spotlight solar energy which characterized in that includes: the solar energy collecting system comprises a groove type condenser field (1), a heat collecting pipe (2), a thermal power vapor compressor (10), a first evaporator group (13), a second evaporator group (14), a condenser (20), a fresh water tank (22) and a sewage tank (23); a plurality of evaporators are included in the first evaporator group (13) or the second evaporator group (14); wherein,
fresh water (12) enters the heat collecting tube (2) from the inlet of the heat collecting tube (2), the groove type condenser field (1) which tracks the sun in real time focuses the collected sunlight onto the heat collecting tube (2), the fresh water (12) flows in the heat collecting tube (2) and is continuously heated, and finally, the fresh water is changed into raw steam (9) and flows out from the outlet of the heat collecting tube (2); the raw steam (9) firstly flows into the thermal steam compressor (10), the thermal steam compressor (10) takes the raw steam (9) as power, low-pressure steam (17) extracted from one or more evaporators or condensers (20) in a first evaporator group (13) and a second evaporator group (14) is compressed, the pressure of the low-pressure steam is increased to a certain degree, and pressurized steam (11) is generated and input into the first evaporator group (13);
the oil field sewage from the sewage tank (23) is pretreated and then enters the condenser (20) for preheating and degassing through a pump, the sewage is changed into sewage (19) after being added with a scale inhibitor, the sewage (19) is uniformly distributed on a top discharge pipe of the second evaporator group (14) through a nozzle and then flows downwards along the top discharge pipe in a film mode, part of the sewage enters the first evaporator group (13) along a sewage pipeline (15) between the evaporators and flows downwards along the top discharge pipe in the film mode in the first evaporator group (13); the pressurized steam (11) from the thermal steam compressor (10) firstly enters a first evaporator group (13) and is condensed into fresh water (25) in an evaporator pipe of the first evaporator group (13), one part of the fresh water flows into a fresh water collecting pipe (18), and the other part of the fresh water (12) enters a heat collecting pipe (2) for circular heating; a part of the sewage in the first evaporator group (13) absorbs the latent heat of the condensed steam in the evaporation pipes of the first evaporator group (13) to evaporate, the generated regenerated steam (16) enters the evaporation pipes of the second evaporator group (14) and is condensed into fresh water (25) in the pipes, the fresh water (25) flows into a fresh water collecting pipe (18), meanwhile, a part of the sewage in the second evaporator group (14) absorbs the latent heat of the condensed steam in the pipes to evaporate, and the generated part of the regenerated steam enters a condenser (20); the regenerated steam preheats and degasses the oilfield sewage from the sewage tank (23) in the condenser (20), the condensed water in the condenser (20) flows into the fresh water collecting pipe (18), the fresh water collecting pipe (18) stores the fresh water into the fresh water tank (22), and the unevaporated sewage flows out in the first evaporator group (13) to be discharged as the concentrated sewage (21).
2. The oilfield sewage treatment system based on trough concentrating solar energy according to claim 1, further comprising an auxiliary boiler (24), wherein the auxiliary boiler (24) is located on the pipeline for transporting the raw steam (9) for generating the raw steam (9) or further heating the existing raw steam (9).
3. The oilfield sewage treatment system based on trough concentrating solar energy according to claim 1 or 2, wherein there are one or more of the fresh water tank (22) and the sewage tank (23).
4. The oilfield sewage treatment system based on trough concentrated solar energy according to claim 1 or 2, wherein the evaporators of the first or second evaporator group (13, 14) are horizontal or vertical tube falling film evaporators; each evaporator of the first evaporator group (13) has a higher operating temperature than each evaporator of the second evaporator group (14), and each evaporator of the first evaporator group (13) has a higher operating pressure than each evaporator of the second evaporator group (14); each evaporator in a single evaporator group has the same operating temperature and operating pressure.
5. The oilfield sewage treatment system based on trough concentrating solar energy of claim 1 or 2, further comprising: a heat absorption medium-water heat exchanger (8); wherein,
a heat absorbing medium (3) enters the heat collecting tube (2) from an inlet of the heat collecting tube (2), a groove type condenser field (1) which tracks the sun in real time focuses collected sunlight onto the heat collecting tube (2), the heat absorbing medium (3) keeps flowing in the heat collecting tube (2) and is continuously heated, and the heat absorbing medium (3) in a high temperature state flows out from an outlet of the heat collecting tube (2); the heat absorbing medium (3) in a high-temperature state enters a heat absorbing medium-water heat exchanger (8) to exchange heat with fresh water (12), so that raw steam (9) is generated; the heat absorbing medium (3) after heat exchange is changed back to a low temperature state and returns to the groove type condenser field (1) and the heat collecting pipe (2) from the heat absorbing medium-water heat exchanger (8) for circulation;
the raw steam (9) flows into the thermal steam compressor (10) firstly, the thermal steam compressor (10) takes the raw steam (9) as power, low-pressure steam (17) extracted from one or more evaporators or condensers (20) in a first evaporator group (13) and a second evaporator group (14) is compressed, the pressure of the low-pressure steam is increased to a certain degree, and pressurized steam (11) is generated and input into the first evaporator group (13);
the oil field sewage from the sewage tank (23) is pretreated and then enters the condenser (20) for preheating and degassing through a pump, the sewage is changed into sewage (19) after being added with a scale inhibitor, the sewage (19) is uniformly distributed on a top discharge pipe of the second evaporator group (14) through a nozzle and then flows downwards along the top discharge pipe in a film mode, and part of the sewage enters the first evaporator group (13) along the sewage pipeline (15) between the evaporators and also flows downwards along the top discharge pipe in the film mode in the first evaporator group (13); the pressurized steam (11) from the thermal steam compressor (10) firstly enters a first evaporator group (13) and is condensed into fresh water (25) in an evaporator pipe of the first evaporator group (13), wherein one part of the fresh water (12) of the fresh water (25) returns to a heat absorption medium-water heat exchanger (8) for circulation to generate the generated steam (9), and the other part of the fresh water flows into a fresh water collecting pipe (18); a part of the sewage in the first evaporator group (13) absorbs the latent heat of the condensed steam in the evaporation pipes of the first evaporator group (13) to evaporate, the generated regenerated steam (16) enters the evaporation pipes of the second evaporator group (14) and is condensed into fresh water (25) in the pipes, the fresh water (25) flows into a fresh water collecting pipe (18), meanwhile, a part of the sewage in the second evaporator group (14) absorbs the latent heat of the condensed steam in the pipes to evaporate, and the generated part of the regenerated steam enters a condenser (20); the regenerated steam preheats and degasses the oilfield sewage from the sewage tank (23) in the condenser (20), the condensed water in the condenser (20) flows into the fresh water collecting pipe (18), the fresh water collecting pipe (18) stores the fresh water into the fresh water tank (22), and the unevaporated sewage flows out in the first evaporator (13) to be discharged as the concentrated sewage (21).
6. The oilfield sewage treatment system based on trough concentrating solar energy according to claim 5, wherein the flow rate of the heat absorbing medium and the flow rate of the water of the heat absorbing medium-water heat exchanger (8) can be adjusted by an adjusting valve or a variable frequency pump, so as to adjust the parameters of the raw steam (9) at the outlet of the heat absorbing medium-water heat exchanger (8).
7. The oilfield sewage treatment system based on trough concentrating solar energy according to claim 5, further comprising a heat absorbing medium-heat storage medium heat exchanger (4), a high temperature heat storage tank (5), a low temperature heat storage tank (6); wherein,
the heat-absorbing medium (3) in a low-temperature state enters the heat-collecting tube (2) from the inlet of the heat-collecting tube (2), the groove-type condenser field (1) which tracks the sun in real time focuses the collected sunlight onto the heat-collecting tube (2), the heat-absorbing medium (3) flows in the heat-collecting tube (2) and is continuously heated, and the heat-absorbing medium (3) in a high-temperature state flows out from the outlet of the heat-collecting tube (2); on one hand, the heat-absorbing medium (3) in a high-temperature state directly enters the heat-absorbing medium-water heat exchanger (8), and exchanges heat with fresh water (12) in the heat-absorbing medium-water heat exchanger (8) to generate raw steam (9), the raw steam (9) enters the thermal steam compressor (10) and carries out a subsequent sewage treatment process, the heat-absorbing medium (3) after heat exchange is changed back to a low-temperature state, and returns to the heat-collecting pipe (2) from the heat-absorbing medium-water heat exchanger (8) for circulation; on the other hand, the heated heat-absorbing medium (3) enters the heat-absorbing medium-heat storage medium heat exchanger (4), heat exchange is carried out between the heat storage medium (7) and the heat storage medium (7) from the low-temperature heat storage tank (6), the heat storage medium (7) enters the high-temperature heat storage tank (5) for heat storage after being heated, the heat absorbing medium (3) participating in heat exchange returns to the heat collecting pipe (2) for circulation, when the sun falls on a mountain, the heat storage medium (7) in a high-temperature state from the high-temperature heat storage tank (5) and the heat absorbing medium (3) in a low-temperature state exchange heat through the heat absorbing medium-heat storage medium heat exchanger (4) to generate the heat absorbing medium (3) in a high-temperature state, the heat absorbing medium (3) in a high temperature state enters a heat absorbing medium-water heat exchanger (8) to exchange heat with water (12), and generated steam (9) enters a thermal steam compressor (10) to carry out a subsequent sewage treatment process.
8. The oilfield sewage treatment system based on trough concentrating solar energy according to claim 7, further comprising a plurality of evaporator groups cascaded with the first evaporator group (13), the second evaporator group (14); different evaporator groups have different operating temperatures and pressures, the operating temperature and pressure of the previous evaporator group are higher than the operating temperature and pressure of the next evaporator group, and the evaporators in the same evaporator group have the same operating temperature and pressure.
9. Oilfield sewage treatment system based on trough concentrated solar energy according to claim 7 or 8, wherein there are one or more of the high temperature and low temperature thermal storage tanks (5, 6) each.
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