CN117146249A - Molten salt heating direct-flow type wet saturated steam generation system - Google Patents
Molten salt heating direct-flow type wet saturated steam generation system Download PDFInfo
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- CN117146249A CN117146249A CN202311330136.4A CN202311330136A CN117146249A CN 117146249 A CN117146249 A CN 117146249A CN 202311330136 A CN202311330136 A CN 202311330136A CN 117146249 A CN117146249 A CN 117146249A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 263
- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 116
- 238000010438 heat treatment Methods 0.000 title claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 175
- 238000001704 evaporation Methods 0.000 claims abstract description 109
- 230000008020 evaporation Effects 0.000 claims abstract description 98
- 238000004064 recycling Methods 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 87
- 239000007788 liquid Substances 0.000 claims description 70
- 239000012530 fluid Substances 0.000 claims description 54
- 238000001514 detection method Methods 0.000 claims description 28
- 238000003860 storage Methods 0.000 claims description 19
- 238000011084 recovery Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 4
- 238000010793 Steam injection (oil industry) Methods 0.000 abstract description 17
- 238000002425 crystallisation Methods 0.000 abstract description 9
- 230000008025 crystallization Effects 0.000 abstract description 9
- 238000013461 design Methods 0.000 description 31
- 238000000034 method Methods 0.000 description 13
- 239000003921 oil Substances 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 10
- 238000012546 transfer Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 7
- 238000004146 energy storage Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000033558 biomineral tissue development Effects 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
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- 238000011897 real-time detection Methods 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/06—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
- F22B35/10—Control systems for steam boilers for steam boilers of forced-flow type of once-through type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/38—Determining or indicating operating conditions in steam boilers, e.g. monitoring direction or rate of water flow through water tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/44—Applications, arrangements, or dispositions of alarm or automatic safety devices of safety valves
- F22B37/446—Safety devices responsive to overpressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D20/0039—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material with stratification of the heat storage material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
Abstract
The invention relates to the technical field of oilfield steam injection, and discloses a molten salt heating direct-current wet saturated steam generation system. The steam generation system comprises an evaporation device, a molten salt conveying device, a preheating device, a softened water conveying device and a dryness adjusting device, wherein the evaporation device is provided with a first heat exchange pipeline and a second heat exchange pipeline; the molten salt conveying equipment comprises a molten salt conveying device and a molten salt recycling device; the preheating device is provided with a first preheating pipeline, and the outlet of the second heat exchange pipeline is connected with a steam output pipeline; the dryness adjusting device comprises an adjusting piece and a dryness detecting device. The steam generation system provided by the invention can adjust the softened water temperature and the molten salt temperature to the application range, avoids the phenomenon of molten salt crystallization, ensures the control of wet saturated steam dryness through a mode of coarse adjustment and fine adjustment for two times, and adopts the direct-flow evaporation equipment, so that the system can be suitable for softened water with poor water quality to meet the steam injection requirement of an oil field.
Description
Technical Field
The invention relates to the technical field of oilfield steam injection, in particular to a molten salt heating direct-current wet saturated steam generation system.
Background
The Liaohe oilfield production system consumes 16.4 hundred million square of natural gas and 22.4 hundred million degrees of electricity, which is equivalent to 245.65 ten thousand tons of standard coal and CO 2 The discharge amount is 528.594 ten thousand tons. The natural gas consumption ratio in the total energy consumption is 88.8%, and the method is mainly used for thick oil thermal recovery and steam injection, and is an important link of energy consumption. The technology is used for replacing fuel gas consumption by exploring an electrothermal molten salt heat storage technology, so that 'electricity in valley/green electricity is used for replacing gas', and after the technology is implemented, the carbon dioxide emission can be reduced, electricity in valley/green electricity can be fully utilized, and the power grid pressure is reduced. The application of the molten salt energy storage technology in photo-thermal power generation has appeared in the 80 th century, molten salt is used as a heat transfer working medium and a heat storage working medium, the existing molten salt energy storage technology is applied to the power generation field, and most of the existing molten salt energy storage technology is applied to a power generation system for producing superheated steam. In addition, some molten salt energy storage technologies are applied to steam generation, but most of the current steam generation systems combined with the molten salt energy storage technologies are used for purifying water quality, and the water quality of the oilfield thick oil steam injection system is high in silicon content, mineralization degree and chlorine content, and needs to produce wet saturated steam with certain dryness, so that the current steam generation systems combined with the molten salt energy storage technologies cannot meet the requirements.
Disclosure of Invention
The invention provides a molten salt heating direct-current type wet saturated steam generation system, which aims to solve the technical problems that the existing steam generation system cannot meet the requirements of poor water supply quality and the production of wet saturated steam with certain dryness in a steam injection system of a thickened oil field.
The invention provides a molten salt heating direct-current wet saturated steam generation system, which comprises:
an evaporation device having a first heat exchange conduit and a second heat exchange conduit;
the molten salt conveying equipment comprises a molten salt conveying device communicated with the inlet of the first heat exchange pipeline and a molten salt recycling device communicated with the outlet of the first heat exchange pipeline, and is arranged to be capable of adjusting the temperature and flow of molten salt entering the first heat exchange pipeline;
a preheating device provided with a first preheating pipeline communicated with the inlet of the second heat exchange pipeline, wherein the outlet of the second heat exchange pipeline is connected with a steam output pipeline, the preheating device is arranged to preheat liquid in the first preheating pipeline, and the preheating device is arranged to adjust the temperature of fluid output through the first preheating pipeline;
a softened water transporting device for transporting softened water into the first preheating pipe, and the softened water transporting device is configured to be able to adjust a flow rate of the softened water transported into the first preheating pipe;
Dryness adjusting equipment comprises an adjusting piece and a dryness detecting device arranged on the steam conveying pipeline, wherein the adjusting piece is arranged to be capable of adjusting dryness of wet saturated steam obtained after heat exchange of fluid through the evaporating equipment according to dryness information of the wet saturated steam fed back by the dryness detecting device.
Optionally, the molten salt conveying device comprises a molten salt storage tank, a molten salt conveying pipeline and a first flow adjusting device, wherein the molten salt conveying pipeline is provided with a molten salt pump, and the first flow adjusting device is used for adjusting the working frequency of the molten salt pump.
Optionally, the first flow rate adjusting device comprises a molten salt flowmeter arranged on the molten salt conveying pipeline and a frequency converter electrically connected with the molten salt pump, and the frequency converter is arranged to be capable of adjusting the working frequency of the molten salt pump according to flow rate information fed back by the molten salt flowmeter.
Optionally, the softened water conveying device comprises a liquid storage tank, a liquid conveying pipeline and a second flow adjusting device, wherein the liquid conveying pipeline is provided with a conveying pump, and the second flow adjusting device is used for adjusting the opening degree of the conveying pump.
Optionally, the second flow rate adjusting device comprises a liquid flow meter arranged on the liquid conveying pipeline, and the conveying pump is arranged to be capable of adjusting the opening degree of the conveying pump according to flow rate information fed back by the liquid flow meter.
Optionally, the preheating device further has a second preheating pipe, an inlet of the second preheating pipe is communicated with the steam output pipe, and an outlet of the second preheating pipe is communicated with the softened water conveying device.
Optionally, the preheating device further includes a condensate delivery pipe and a condensate regulating valve disposed on the condensate delivery pipe, and the outlet of the second preheating pipe is communicated with the softened water delivery device through the condensate delivery pipe and configured to:
the temperature of the fluid output from the first preheating pipe can be adjusted by adjusting the opening degree of the condensate adjusting valve.
Optionally, the preheating device further comprises a first temperature detection device for detecting the temperature of the fluid flowing out through the outlet of the first preheating pipeline, the first temperature detection device is electrically connected with the condensate regulating valve, and the condensate regulating valve is set to be capable of regulating the opening degree of the condensate regulating valve according to temperature information fed back by the first temperature detection device.
Optionally, the steam output pipeline is communicated with an inlet of the second preheating pipeline through a backflow pipeline, and the backflow pipeline is connected with a steam conveying device.
Optionally, the evaporation device comprises an evaporator,
the first heat exchange pipeline comprises a first evaporation pipeline arranged in the evaporator, an inlet of the first evaporation pipeline is communicated with the molten salt conveying device, and an outlet of the first evaporation pipeline is communicated with the molten salt recycling device;
the second heat exchange pipeline comprises a second evaporation pipeline arranged in the evaporator, an inlet of the second evaporation pipeline is communicated with an outlet of the first preheating pipeline, and an outlet of the second evaporation pipeline is communicated with the steam output pipeline.
Optionally, the evaporation apparatus further comprises a heater,
the first heat exchange pipeline further comprises a first heating pipeline arranged in the heater, an inlet of the first heating pipeline is communicated with an outlet of the first evaporation pipeline, and an outlet of the first heating pipeline is communicated with the molten salt recovery device;
the second heat exchange pipeline further comprises a second heating pipeline arranged inside the heater, an inlet of the second heating pipeline is communicated with an outlet of the first preheating pipeline, and an outlet of the second heating pipeline is communicated with an inlet of the second evaporation pipeline.
Optionally, the molten salt conveying device further comprises a molten salt bypass pipeline, an inlet of the molten salt bypass pipeline is communicated with the molten salt conveying device, an outlet of the molten salt bypass pipeline is communicated with an outlet of the first evaporation pipeline, and a first regulating valve for regulating the flow of molten salt is arranged on the molten salt bypass pipeline.
Optionally, the molten salt conveying apparatus further includes a second temperature detecting device for detecting a temperature of the molten salt flowing out through the first evaporation pipe, the first regulating valve is electrically connected with the second temperature detecting device, and the first regulating valve is configured to be capable of regulating an opening of the first regulating valve according to temperature information fed back by the second temperature detecting device.
Optionally, the adjusting part comprises a softened water bypass pipeline and a second adjusting valve arranged on the softened water bypass pipeline, an inlet of the softened water bypass pipeline is communicated with an outlet of the first preheating pipeline, an outlet of the softened water bypass pipeline is communicated with an inlet of the second evaporation pipeline, and the second adjusting valve is arranged to be capable of adjusting the opening of the second adjusting valve according to dryness information of the wet saturated steam fed back by the dryness detection device.
Optionally, the outlet of the first preheating pipeline is also connected with a diversion pipeline, and a third regulating valve for regulating the flow of softened water is arranged on the diversion pipeline.
Optionally, the molten salt heated direct flow wet saturated steam generating system further comprises a pressure relief device arranged to release fluid and superheated steam within the evaporation device when the softened water transporting device is deactivated.
Optionally, the pressure relief device comprises a pressure relief pipeline communicated with the outlet of the first preheating pipeline and a first pressure relief valve arranged on the pressure relief pipeline, wherein the first pressure relief valve is opened when the softened water conveying device stops conveying softened water, and the evaporation device is opened when the first pressure relief valve is opened, and fluid in the second heat exchange pipeline can flow to the pressure relief pipeline.
Optionally, an outlet of the pressure relief pipeline is connected with a discharge expander.
Optionally, the pressure relief device comprises an exhaust conduit in communication with the steam output conduit and a second relief valve provided on the exhaust conduit, the second relief valve being arranged to open when the pressure in the steam output conduit is below a preset pressure.
Optionally, a pressure detection device for detecting the pressure of the circulating wet saturated steam is arranged on the steam output pipeline, and the pressure detection device is electrically connected with the second pressure release valve and is configured to:
and when the pressure detection device detects that the pressure of the wet saturated steam is lower than the preset pressure, the second pressure relief valve is opened.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
in the molten salt heating direct-flow wet saturated steam generation system provided by the application, softened water firstly enters the preheating equipment for preheating and then flows to the second heat exchange pipeline, the temperature of the preheated softened water entering the second heat exchange pipeline can be regulated through the preheating equipment, meanwhile, the temperature of molten salt entering the first heat exchange pipeline can be regulated through the molten salt conveying equipment, so that the temperature of the softened water and the temperature of the molten salt can be respectively regulated to the application range, the phenomenon of molten salt crystallization caused by excessively low molten salt temperature after heat exchange is avoided, the first heat exchange pipeline is further prevented from being blocked, the maintenance frequency of the steam generation system is reduced, and the service life of the steam generation system is prolonged; in addition, the flow rate of molten salt transportation and the flow rate of softened water transportation can be respectively regulated through the molten salt transportation equipment and the softened water transportation equipment, so that the coarse regulation of the dryness of the wet saturated steam obtained after heat exchange and evaporation through the evaporation equipment is realized, the dryness of the wet saturated steam is regulated through the regulating piece according to the dryness information of the wet saturated steam fed back by the dryness detection device, the fine regulation of the dryness of the wet saturated steam is further realized, the dryness of the wet saturated steam can be accurately controlled through two regulation, and the steam generation system adopts the direct-current evaporation equipment, so that the method is suitable for the characteristics of high silicon content, high chlorine content, high mineralization degree and the like of the softened water of an oil field, and the steam injection requirement of the oil field is met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a molten salt heating direct-current type wet saturated steam generating system according to an embodiment of the invention.
Description of the reference numerals
1. An evaporation device; 11. an evaporator; 12. a heater; 2. molten salt conveying equipment; 21. molten salt conveying pipeline; 22. a molten salt pump; 23. a molten salt flow meter; 24. a frequency converter; 25. a molten salt bypass line; 3. a preheating device; 31. a condensate delivery conduit; 32. a condensate water regulating valve; 4. a softened water transporting device; 41. a liquid storage tank; 42. a liquid delivery conduit; 43. a transfer pump; 44. a liquid flow meter; 5. a steam output pipe; 51. dryness detection device; 52. a pressure detection device; 6. a return line; 61. a steam delivery device; 7. a demineralized water bypass line; 71. a second regulating valve; 8. a pressure relief conduit; 81. a first pressure relief valve; 82. discharging the expansion vessel; 9. an exhaust duct; 91. and a second pressure release valve.
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be made. The embodiments of the present invention and the features in the embodiments may be combined with each other without collision.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein; it is apparent that the embodiments in the specification are only some embodiments of the present invention, but not all embodiments.
As shown in fig. 1, the molten salt heating direct-current wet saturated steam generation system provided by the embodiment of the invention comprises an evaporation device 1, a molten salt conveying device 2, a preheating device 3, a softened water conveying device 4 and a dryness adjusting device.
The evaporation device 1 has a first heat exchange line and a second heat exchange line. It will be appreciated that the fluid in the first heat exchange conduit is capable of exchanging heat with the fluid in the second heat exchange conduit, wherein the direction of flow of the fluid in the first heat exchange conduit is capable of being the same or opposite to the direction of flow of the fluid in the second heat exchange conduit, which is not limiting, and that the heat exchange effect between the fluids can be further increased when the direction of flow of the fluid in the first heat exchange conduit is opposite to the direction of flow of the fluid in the second heat exchange conduit. The extension modes of the first heat exchange pipeline and the second heat exchange pipeline are not limited, and the first heat exchange pipeline and the second heat exchange pipeline can be in a serpentine shape and the like. In addition, the first heat exchange pipeline or the second heat exchange pipeline can be one pipe side and one pipe side, namely the evaporation device 1 is provided with one pipeline for one fluid to pass through, and at the moment, the shell serves as the other pipeline, so that the other fluid flows in the shell of the evaporation device 1, and heat exchange between the two fluids is realized.
The molten salt conveying device 2 comprises a molten salt conveying device communicated with the inlet of the first heat exchange pipeline and a molten salt recycling device communicated with the outlet of the first heat exchange pipeline. The molten salt conveying device is used for conveying high-temperature molten salt, and the molten salt with relatively low temperature after heat exchange can flow into the molten salt recovery device. The molten salt conveying equipment 2 adopts a direct current heat exchange structure by the design mode. The molten salt can travel through the shell pass to increase the sectional area of a molten salt flow path, so that the molten salt is prevented from crystallizing in the tube pass. The molten salt conveying apparatus 2 is arranged to be able to regulate the temperature and flow of molten salt into the first heat exchange conduit. The molten salt conveying equipment 2 can adjust the temperature of molten salt in the first heat exchange pipeline to an adaptation range, and the phenomenon of molten salt crystallization caused by too low molten salt temperature is avoided. In addition, the fused salt conveying equipment 2 can adjust the flow rate of the fused salt conveyed by the fused salt conveying equipment 2 according to the preset dryness of the wet saturated steam conveyed by the steam conveying pipeline, so that the fused salt with the flow rate and softened water with corresponding capacity can obtain the wet saturated steam with the dryness close to the preset dryness of the wet saturated steam after heat exchange, and further the coarse adjustment of the dryness of the wet saturated steam is realized.
The preheating device 3 is provided with a first preheating pipeline communicated with the inlet of the second heat exchange pipeline, so that softened water preheated by the preheating device 3 can enter the second heat exchange pipeline, the outlet of the second heat exchange pipeline is connected with a steam output pipeline 5, and then fluid (wet saturated steam) subjected to heat exchange by the evaporation device 1 can enter the steam output pipeline 5 and is further conveyed to the steam injection well. The design mode enables heat exchange of softened water to adopt an immersed direct-current heat exchange structure, is suitable for the characteristics of high silicon content, high chlorine content, high mineralization degree and the like of the softened water in an oil field, and can manufacture wet saturated steam with certain dryness. The preheating device 3 is arranged to be able to preheat the liquid in the first preheating conduit. The arrangement mode of the preheating device 3 is not limited, and it is only necessary to ensure that the preheating device 3 can preheat softened water in the first preheating pipeline inside the preheating device. The preheating device 3 is arranged to be able to regulate the temperature of the fluid output via the first preheating conduit. This kind of design mode makes preheating equipment 3 can be with the temperature adjustment to accommodation of the fluid through first preheating pipe way output to reduce the difference in temperature between softened water and the fused salt, avoid making the fused salt crystallization's that the fused salt temperature caused the too low phenomenon take place after the heat transfer, and then avoid first heat transfer pipe way to block up, reduce the maintenance frequency of system, increase the life of system.
The softened water transporting apparatus 4 is for transporting softened water into the first pre-heating conduit. The molten salt heating direct-current type wet saturated steam generation system adopting the design mode can utilize valley electricity or green electricity to heat molten salt energy storage, and then utilizes the molten salt to produce wet saturated steam for oil field production steam injection, so that the electrification rate of oil field production is improved, and the carbon dioxide emission is reduced. The softened water transporting apparatus 4 is provided so as to be able to adjust the flow rate of the softened water transported into the first preheating pipe. Specifically, the softened water conveying device 4 can adjust the flow rate of the softened water conveyed by the softened water conveying device 4 according to the preset dryness of the wet saturated steam conveyed by the steam conveying pipeline, so that the softened water with the flow rate and molten salt with corresponding capacity can obtain the wet saturated steam with the dryness close to the preset dryness of the wet saturated steam after heat exchange, and further the coarse adjustment of the dryness of the wet saturated steam is realized.
The dryness adjusting device comprises an adjusting piece and a dryness detecting device 51 arranged on the steam conveying pipeline, wherein the adjusting piece is arranged to be capable of adjusting dryness of the wet saturated steam obtained after the fluid exchanges heat through the evaporating device 1 according to dryness information of the wet saturated steam fed back by the dryness detecting device 51. After heat exchange is performed between softened water and molten salt in the evaporation device 1, wet saturated steam with a dryness close to a preset dryness is obtained, at this time, an actual dryness of the wet saturated steam is detected by the dryness detection device 51, and when a dryness deviation of the wet saturated steam from the preset dryness is detected, the dryness of the wet saturated steam is adjusted by an adjusting piece (which can be achieved by adjusting the temperature in the liquid heating process, which is specifically described in the following embodiments), so that the use requirement is met.
The dryness detection device 51 is a permanent part for detecting dryness of wet steam in the art, and the structure and the working principle of the dryness detection device 51 are not described too much, and in the present application, the dryness detection device 51 is used for detecting dryness of wet saturated steam output through a steam conveying pipeline.
In the molten salt heating direct-flow wet saturated steam generation system provided by the application, softened water firstly enters the preheating equipment 3 for preheating and then flows to the second heat exchange pipeline, the temperature of the preheated softened water entering the second heat exchange pipeline can be regulated through the preheating equipment 3, meanwhile, the temperature of molten salt entering the first heat exchange pipeline can be regulated through the molten salt conveying equipment 2, so that the temperature of the softened water and the temperature of the molten salt can be respectively regulated to be in an adaptive range, the phenomenon of molten salt crystallization caused by excessively low molten salt temperature after heat exchange is avoided, the first heat exchange pipeline is further prevented from being blocked, the maintenance frequency of the steam generation system is reduced, and the service life of the steam generation system is prolonged; in addition, the flow rate of molten salt transportation and the flow rate of softened water transportation can be respectively regulated through the molten salt transportation equipment 2 and the softened water transportation equipment 4, so that the coarse regulation of the dryness of the wet saturated steam obtained after heat exchange and evaporation of the evaporation equipment 1 is realized, the dryness of the wet saturated steam is regulated through a regulating piece according to the dryness information of the wet saturated steam fed back by the dryness detection device 51, the fine regulation of the dryness of the wet saturated steam is further realized, the dryness of the wet saturated steam can be accurately controlled through two regulation, and the steam generation system adopts the direct-current evaporation equipment 1, so that the method is suitable for the characteristics of high silicon content, high chlorine content, high mineralization degree and the like of softened water of an oil field, and the requirement of steam injection of the oil field is met.
As shown in fig. 1, the molten salt conveying device comprises a molten salt storage tank, a molten salt conveying pipeline 21 and a first flow rate adjusting device, wherein the molten salt conveying pipeline 21 is provided with a molten salt pump 22, and the first flow rate adjusting device is used for adjusting the working frequency of the molten salt pump 22. Specifically, the inside of fused salt holding vessel is used for depositing high temperature fused salt, and wherein, the deposit of here can be for temporarily depositing, in the fused salt transportation process promptly, can pile up in the fused salt holding vessel, ensures the conveying effect of fused salt. The molten salt storage tank is communicated with the molten salt conveying pipeline 21 so as to be capable of conveying molten salt in the molten salt storage tank into the first heat exchange pipeline through the molten salt pump 22. The first flow adjusting device can adjust the working frequency of the molten salt pump 22 according to the preset dryness of the wet saturated steam conveyed by the steam conveying pipeline, so that the flow of the molten salt conveyed by the molten salt conveying pipeline 21 meets the requirement.
As a possible embodiment, the first flow rate adjustment device includes a molten salt flow meter 23 provided on the molten salt conveying pipe 21 and a frequency converter 24 electrically connected to the molten salt pump 22, the frequency converter 24 being provided so as to be able to adjust the operating frequency of the molten salt pump 22 in accordance with flow rate information fed back by the molten salt flow meter 23.
Under this design mode, the flow rate of the molten salt conveyed by the molten salt conveying pipeline 21 can be detected in real time through the molten salt flowmeter 23, the obtained flow rate information of the molten salt is fed back to the control system, the control system can obtain the preset working frequency of the molten salt pump 22 according to the flow rate information of the molten salt, the preset working frequency information is transmitted to the frequency converter 24, and the frequency converter 24 adjusts the molten salt pump 22 to the preheating working frequency after receiving the working frequency information, so that the requirement is met. The manner in which the flow is fed back and regulated is conventional to those skilled in the art and is not described in any great detail herein.
As shown in fig. 1, the softened water transporting apparatus 4 includes a liquid storage tank 41, a liquid transporting pipe 42, and a second flow rate adjusting device, a transporting pump 43 is provided on the liquid transporting pipe 42, and the second flow rate adjusting device is used for adjusting the opening degree of the transporting pump 43. Specifically, the liquid tank 41 is for storing softened water, and the liquid tank 41 is in communication with a liquid delivery pipe 42 so that the liquid in the liquid tank 41 can be delivered into the first preheating pipe by a delivery pump 43. The second flow rate adjusting device may adjust the opening of the delivery pump 43 according to the preset dryness of the wet saturated steam delivered by the steam delivery pipe, so that the flow rate of the liquid delivered by the liquid delivery pipe 42 meets the requirement.
As a possible embodiment, the second flow rate adjustment device includes a liquid flow meter 44 provided on the liquid delivery pipe 42, and the delivery pump 43 is provided so that the opening degree of the delivery pump 43 can be adjusted according to flow rate information fed back by the liquid flow meter 44.
Under this design mode, the flow rate of the softened water conveyed by the liquid conveying pipeline 42 can be detected in real time through the liquid flowmeter 44, the obtained flow rate information of the softened water is fed back to the control system, the control system can obtain the preset working frequency of the conveying pump 43 according to the flow rate information of the softened water, and the preset working frequency information is transmitted to the conveying pump 43 so as to change the opening degree of the conveying pump 43, so that the flow rate of the softened water conveyed by the liquid conveying pipeline 42 meets the requirement. The manner in which the flow is fed back and regulated is conventional to those skilled in the art and is not described in any great detail herein.
Further optimally, the softened water conveying device 4 of the application further comprises a liquid supply pipeline for conveying softened water towards the liquid storage tank 41, so that softened water can be conveyed towards the liquid storage tank 41 through the liquid supply pipeline, the softened water in the liquid storage tank 41 can always meet conveying requirements, and the phenomenon of insufficient softened water is avoided. And the mode of continuously conveying softened water through the liquid supply pipeline can enable the whole system to continuously work, so that the working efficiency is ensured.
Further optimally, the softened water transporting apparatus 4 further comprises a liquid level adjusting device for adjusting the liquid level in the liquid storage tank 41. This kind of design mode can ensure that the liquid level of the softened water in the liquid storage pot 41 is stable, and then ensures the stability that the softened water is carried to the liquid storage pot 41, can ensure simultaneously that the softened water has been deposited all the time in the liquid storage pot 41, avoids the system to shut down.
As a possible embodiment, the liquid level adjusting device includes a liquid level gauge provided inside the liquid tank 41 and an adjusting valve provided on the liquid supply pipe, the adjusting valve being provided so that the opening degree of the adjusting valve can be adjusted according to liquid level height information fed back by the liquid level gauge. The level gauge is a permanent part for detecting the liquid level, and the structure and the working principle of the level gauge are not described too much.
Under this kind of design mode, can be through the height of liquid level in the liquid storage pot 41 of level gauge real-time detection to with the liquid level information feedback to control system that detects, control system sends corresponding working signal towards the governing valve according to the liquid level information of level gauge feedback, so that the governing valve changes the speed that softened water enters into in the liquid storage pot 41 through adjusting self aperture, in order to ensure the stability of softened water liquid level in the liquid storage pot 41.
The preset steam displacement of the steam conveying pipeline is 4-6t/h, the flow rate of softened water conveyed by the softened water conveying equipment 4 is regulated to be 6.6-10.9t/h by the first flow regulating device, and the flow rate of molten salt conveyed by the molten salt conveying device is regulated to be 21.6-34.2t/h by the second flow regulating device. According to the application, the heat matching relation between the molten salt flow and the liquid flow is realized by setting the flow of the softened water conveyed by the softened water conveying equipment 4 and the flow of the molten salt conveyed by the molten salt conveying device, so that the wet saturated steam with preset dryness can be obtained, and the steam injection requirement is met.
The pressure of the wet saturated steam conveyed by the steam conveying pipeline has a certain influence on the flow rate of softened water conveyed by the softened water conveying equipment 4 and the flow rate of molten salt conveyed by the molten salt conveying device, and the method specifically comprises the following steps:
in some embodiments, when the pressure of the wet saturated steam conveyed through the steam conveying pipeline is 6MPa, the first flow adjusting device adjusts the flow rate of the softened water conveyed by the softened water conveying device 4 to be 6.6-10.4t/h, and the second flow adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 21.6-33.6t/h.
Example 1
When the pressure of the wet saturated steam conveyed by the steam conveying pipeline is 6Mpa and the preset steam displacement of the steam conveying pipeline is 4t/h, the first flow regulating device regulates the flow of the softened water conveyed by the softened water conveying equipment 4 to be 6.6-7.6t/h, preferably 7.1t/h; the second flow rate adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 21.6-22.6t/h, preferably 22.1t/h.
Example 2
When the pressure of the wet saturated steam conveyed by the steam conveying pipeline is 6Mpa and the preset steam displacement of the steam conveying pipeline is 5t/h, the first flow regulating device regulates the flow of the softened water conveyed by the softened water conveying equipment 4 to be 8.0-10.0t/h, preferably 8.5t/h; the second flow rate adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 27.1-28.1t/h, preferably 27.6t/h.
Example 3
When the pressure of the wet saturated steam conveyed by the steam conveying pipeline is 6Mpa and the preset steam displacement of the steam conveying pipeline is 6t/h, the first flow regulating device regulates the flow of the softened water conveyed by the softened water conveying equipment 4 to be 9.4-10.4t/h, preferably 9.9t/h; the second flow rate adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 32.6-33.6t/h, preferably 33.1t/h.
In other embodiments, when the pressure of the wet saturated steam conveyed through the steam conveying pipeline is 7MPa, the first flow adjusting device adjusts the flow rate of the softened water conveyed by the softened water conveying device 4 to be 6.7-10.7t/h, and the second flow adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 21.9-33.9t/h.
Example 1
When the pressure of the wet saturated steam conveyed by the steam conveying pipeline is 7Mpa and the preset steam displacement of the steam conveying pipeline is 4t/h, the first flow regulating device regulates the flow of the softened water conveyed by the softened water conveying equipment 4 to be 6.7-7.8t/h, preferably 7.2t/h; the second flow rate adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 21.9-22.9t/h, preferably 22.4t/h.
Example 2
When the pressure of the wet saturated steam conveyed by the steam conveying pipeline is 7Mpa and the preset steam displacement of the steam conveying pipeline is 5t/h, the first flow regulating device regulates the flow of the softened water conveyed by the softened water conveying equipment 4 to be 8.2-10.2t/h, preferably 8.7t/h; the second flow rate adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 27.4-28.4t/h, preferably 27.7t/h.
Example 3
When the pressure of the wet saturated steam conveyed by the steam conveying pipeline is 7Mpa and the preset steam displacement of the steam conveying pipeline is 6t/h, the first flow regulating device regulates the flow of the softened water conveyed by the softened water conveying equipment 4 to be 9.7-10.7t/h, preferably 10.2t/h; the second flow rate adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 32.9-33.9t/h, preferably 33.4t/h.
In other embodiments, when the pressure of the wet saturated steam conveyed through the steam conveying pipeline is 8MPa, the first flow adjusting device adjusts the flow rate of the softened water conveyed by the softened water conveying device 4 to be 6.9-10.9t/h, and the second flow adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 22.2-34.2t/h.
Example 1
When the pressure of the wet saturated steam conveyed by the steam conveying pipeline is 8Mpa and the preset steam displacement of the steam conveying pipeline is 4t/h, the first flow regulating device regulates the flow of the softened water conveyed by the softened water conveying equipment 4 to be 6.9-8.0t/h, preferably 7.4t/h; the second flow rate adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 22.2-23.2t/h, preferably 22.7t/h.
Example 2
When the pressure of the wet saturated steam conveyed by the steam conveying pipeline is 8Mpa and the preset steam displacement of the steam conveying pipeline is 5t/h, the first flow regulating device regulates the flow of the softened water conveyed by the softened water conveying equipment 4 to be 8.4-10.4t/h, preferably 8.9t/h; the second flow rate adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to be 27.7-28.7t/h, preferably 28.2t/h.
Example 3
When the pressure of the wet saturated steam conveyed by the steam conveying pipeline is 8Mpa and the preset steam displacement of the steam conveying pipeline is 6t/h, the first flow regulating device regulates the flow of the softened water conveyed by the softened water conveying equipment 4 to be 9.9-10.9t/h, preferably 10.4t/h; the second flow rate adjusting device adjusts the flow rate of the molten salt conveyed by the molten salt conveying device to 33.2-34.2t/h, preferably 33.7t/h.
The preheating device 3 also has a second preheating duct, it being understood that the fluid in the first preheating duct is capable of exchanging heat with the fluid in the second preheating duct, wherein the direction of flow of the fluid in the first preheating duct is capable of being the same or opposite to the direction of flow of the fluid in the second preheating duct, which are not restrictive, and the heat exchanging effect between the fluids can be further increased when the direction of flow of the fluid in the first preheating duct is opposite to the direction of flow of the fluid in the second preheating duct. The extension modes of the first preheating pipeline and the second preheating pipeline are not limited, and the first preheating pipeline and the second preheating pipeline can be in a serpentine shape and the like. The inlet of the second preheating pipeline is communicated with the steam output pipeline 5, and in the design mode, redundant steam conveyed by the steam output pipeline 5 is shunted into the preheating equipment 3 so as to preheat softened water in the preheating equipment 3, so that heat waste is avoided, and steam conveying cost is reduced. The outlet of the second preheating pipe is communicated with the softened water transporting device 4. Under this kind of design mode for in the unnecessary steam of steam output pipeline 5 transport shunted preheating equipment 3, with preheat preheating equipment 3's demineralized water, and the condensate water backward flow after preheating is in demineralized water conveying equipment 4, reduces the setting of extra collection equipment, the rational utilization resource avoids the heat extravagant.
The preheating device 3 further comprises a condensate conveying pipeline 31 and a condensate regulating valve 32 arranged on the condensate conveying pipeline 31, wherein the outlet of the second preheating pipeline is communicated with the softened water conveying device 4 through the condensate conveying pipeline 31, and the temperature of the fluid output by the first preheating pipeline can be regulated by regulating the opening degree of the condensate regulating valve 32. Under this kind of design mode, can carry the condensate water that obtains after cooling wet saturated steam heat transfer to softened water conveying equipment 4 through condensate water conveying pipeline 31, and the condensate water governing valve can adjust the dwell time of wet saturated steam in the second preheating pipeline through adjusting self aperture, and then adjust the wet saturated steam in the second preheating pipeline and the heat exchange efficiency of the softened water in the first preheating pipeline, and then change the temperature of the softened water of first preheating pipeline output, so that the first softened water that satisfies the demand can be carried to the preheating pipeline.
The preheating device 3 further comprises a first temperature detection device for detecting the temperature of the fluid flowing out through the outlet of the first preheating pipeline, and the design mode can monitor the temperature of the softened water flowing out through the first preheating pipeline in real time through the first temperature detection device, and further when the temperature of the softened water flowing out through the first preheating pipeline is monitored to be lower than the preset temperature, a worker can adjust the condensation water regulating valve so that the temperature of the softened water flowing out through the first preheating pipeline meets the preset requirement. The first temperature detecting device may be a temperature sensor to detect a temperature of the softened water flowing out through the first preheating pipe by the temperature sensor.
Further preferably, the first temperature detecting device is electrically connected with a condensate adjusting valve, and the condensate adjusting valve is arranged to be capable of adjusting the opening of the condensate adjusting valve according to temperature information fed back by the first temperature detecting device. Under this kind of design mode, can realize the automatic regulation of the aperture of condensate regulating valve to realize the automated control of the softened water temperature who flows out through first preheating pipe.
The steam output pipeline 5 is communicated with the inlet of the second preheating pipeline through a return pipeline 6, and a steam conveying device 61 is connected to the return pipeline 6. Specifically, the inlet of the return line 6 communicates with the steam output line 5, and the outlet of the return line 6 communicates with the inlet of the second preheating line. Under this kind of design mode, through in the return conduit 6 shunts the wet saturated steam in the steam output pipeline 5 to the second preheated pipeline, wherein, return conduit 6 can have certain length to can cool down when making wet saturated steam backward flow, and then avoid the scale deposit phenomenon emergence that the too big difference in temperature between wet saturated steam and the softened water that flows backward. The length of the return pipe 6 can be designed according to practical requirements to ensure that the wet saturated steam can be reduced to a preset temperature. In addition, the flow rate of the wet saturated steam reflux can be controlled by arranging a valve on the reflux pipeline 6, so that the amount of the wet saturated steam input into the steam injection wellhead can be ensured to meet the requirement.
In addition, the steam delivery device 61 may be used to provide the second preheating duct with steam of a certain temperature when the system is not fully operated (the steam output duct 5 does not generate wet saturated steam) so that the softened water in the preheating device 3 can be preheated by the steam introduced from the outside.
As shown in fig. 1, the evaporation apparatus 1 includes an evaporator 11, and the first heat exchange pipe includes a first evaporation pipe provided inside the evaporator 11, an inlet of the first evaporation pipe is communicated with the molten salt conveying device, and an outlet of the first evaporation pipe is communicated with the molten salt recovery device. The first evaporation pipeline and the molten salt conveying device can be directly communicated, and the first evaporation pipeline and the molten salt conveying device can be communicated through other pipelines. The first evaporation pipeline can be directly communicated with the molten salt recovery device, and can also be communicated with the molten salt recovery device through other pipelines, so that the design can be carried out according to actual requirements.
The second heat exchange pipeline comprises a second evaporation pipeline arranged in the evaporator 11, an inlet of the second evaporation pipeline is communicated with an outlet of the first preheating pipeline, and an outlet of the second evaporation pipeline is communicated with the steam output pipeline 5. The second evaporation pipeline at the position can be directly communicated with the outlet of the first preheating pipeline, and can also be communicated with the outlet of the first preheating pipeline through other pipelines; the outlet of the second evaporation pipeline can be directly communicated with the steam output pipeline 5, and the outlet of the second evaporation pipeline can be communicated with the steam output pipeline 5 through other pipelines, so that the steam output pipeline is not limited, and the steam output pipeline can be designed according to actual requirements. Wherein the molten salt in the first evaporation pipe is capable of exchanging heat with the softened water in the second evaporation pipe to heat the softened water to wet saturated steam. The extension modes of the first evaporation pipeline and the second evaporation pipeline are not limited, and the first evaporation pipeline and the second evaporation pipeline can be designed according to actual requirements. In addition, the first evaporation pipe may be formed by the inner cavity of the evaporator 11, i.e. the molten salt is taken away from the shell side and the softened water is taken away from the tube side, so as to avoid crystallization of the molten salt in the tube side.
Further preferably, the evaporator 11 is arranged such that the direction of fluid flow in the first evaporation conduit is opposite to the direction of fluid flow in the second evaporation conduit. The design mode ensures that the fluid in the first evaporation pipeline and the fluid in the second evaporation pipeline are in convection so as to realize forced heat exchange, and further increases the heat exchange efficiency of molten salt and softened water in the evaporator 11.
As shown in fig. 1, the evaporation apparatus 1 further includes a heater 12, the first heat exchange pipe further includes a first heating pipe provided inside the heater 12, an inlet of the first heating pipe is communicated with an outlet of the first evaporation pipe, and an outlet of the first heating pipe is communicated with the molten salt recovery device. The outlet of the first heating pipeline and the molten salt recovery device can be directly communicated, the outlet of the first heating pipeline and the molten salt recovery device can be also communicated through other pipelines, the inlet of the first heating pipeline and the outlet of the first evaporation pipeline can be also directly communicated, the inlet of the first heating pipeline and the outlet of the first evaporation pipeline can be also communicated through other pipelines, and the two are not limitative.
The second heat exchange pipe further comprises a second heating pipe arranged inside the heater 12, wherein an inlet of the second heating pipe is communicated with an outlet of the first preheating pipe, and an outlet of the second heating pipe is communicated with an inlet of the second evaporation pipe. The inlet of the second heating pipeline and the outlet of the first preheating pipeline can be directly communicated, the inlet of the second heating pipeline and the outlet of the first preheating pipeline can be also communicated through other pipelines, the outlet of the second heating pipeline and the inlet of the second evaporation pipeline can be directly communicated, and the outlet of the second heating pipeline and the inlet of the second evaporation pipeline can be also communicated through other pipelines, so that the heating device is not limited. The extension modes of the first heating pipeline and the second heating pipeline are not limited, and the first heating pipeline and the second heating pipeline can be designed according to actual requirements. In addition, a first heating conduit may be formed by the inner cavity of the heater 12, i.e. such that molten salt passes through the shell side and softened water passes through the tube side, to avoid crystallization of the molten salt within the tube side.
Further preferably, the heater 12 is arranged such that the direction of fluid flow in the first heating conduit is opposite to the direction of fluid flow in the second heating conduit. The design mode ensures that the fluid in the first heating pipeline and the fluid in the second heating pipeline are in convection so as to realize forced heat exchange, and the heat exchange efficiency of molten salt and softened water in the heater 12 is further increased.
Under this kind of design mode, in the fused salt reentrant first heating pipeline after heat transfer cooling in the evaporimeter 11, at this moment, the temperature of fused salt reduces to the fused salt through the temperature is lower relatively heats the demineralized water that enters into in the second heating pipeline, and the demineralized water reentrant second evaporation pipeline after the heating evaporates in order to form wet saturated steam. The evaporation equipment 1 with the design mode realizes a heat exchange mode that softened water is heated firstly and evaporated again, is convenient for controlling the temperature after liquid heat exchange, and is further convenient for controlling the dryness of wet saturated steam and adjusting the temperature of molten salt.
The molten salt conveying device 2 further comprises a molten salt bypass pipeline 25, an inlet of the molten salt bypass pipeline 25 is communicated with the molten salt conveying device, an outlet of the molten salt bypass pipeline 25 is communicated with an outlet of the first evaporation pipeline, and a first regulating valve for regulating the flow of molten salt is arranged on the molten salt bypass pipeline 25. Wherein, can directly communicate between the entry of fused salt bypass line 25 and the fused salt pipeline 21, also accessible other pipeline intercommunication between the entry of fused salt bypass line 25 and the fused salt pipeline 21, the export of fused salt bypass line 25 and the export of first evaporating pipe can directly communicate, and the export of fused salt bypass line 25 and the export of first evaporating pipe also accessible other pipeline communicate, and these are all not limiting, can design according to actual demand. The first regulating valve can regulate the on-off state of the molten salt bypass pipeline 25, and the flow of molten salt flowing through the molten salt bypass pipeline 25 can be regulated through the opening degree of the first regulating valve.
Under this kind of design mode, the accessible opens first governing valve and makes partial fused salt not pass through evaporimeter 11, but enters into in the heater 12 together after mixing with the fused salt after the heat transfer of evaporimeter 11 cooling to increase the temperature of entering into the inside fused salt of heater 12, avoid fused salt and softened water heat transfer cooling back, the temperature reduces below crystallization temperature, and then avoids appearing the phenomenon of fused salt crystallization.
The molten salt conveying apparatus 2 further includes a second temperature detecting device for detecting a temperature of the molten salt flowing out through the first evaporation pipe. This kind of design mode can be through the temperature of second temperature-detecting device real-time supervision through the fused salt of first evaporating pipe outflow, and then when monitoring that the fused salt of first evaporating pipe outflow is less than the temperature of predetermineeing, the aperture of first governing valve can be adjusted to the staff to make the temperature of fused salt of first evaporating pipe outflow satisfy the demand of predetermineeing. The second temperature detecting device may be a temperature sensor to detect the temperature of the molten salt flowing out through the first evaporation pipe by the temperature sensor, and the temperature sensor may be specifically disposed on the outflow pipe of the first evaporation pipe. Of course the number of the devices to be used,
further preferably, the first regulating valve is electrically connected with the second temperature detecting device, and the first regulating valve is set to be capable of regulating the opening degree of the first regulating valve according to temperature information fed back by the second temperature detecting device. Under this kind of design mode, can realize the automatically regulated of the aperture of first governing valve to realize the automated control of the fused salt temperature that flows out through first evaporating pipe.
The regulating member includes a softened water bypass line 7 and a second regulating valve 71 provided on the softened water bypass line 7, an inlet of the softened water bypass line 7 is communicated with an outlet of the first preheating pipe, an outlet of the softened water bypass line 7 is communicated with an inlet of the second evaporating pipe, and the second regulating valve 71 is provided so as to be capable of regulating an opening degree of the second regulating valve 71 according to dryness information of wet saturated steam fed back by the dryness detecting device 51.
In this design, a part of the fluid flowing to the heater 12 through the preheating device 3 can be split through the bypass pipeline, and the part of the fluid bypasses the heater 12 and is mixed with a part of the fluid heated by the heater 12 to enter the evaporator 11, so that the temperature of the fluid entering the evaporator 11 can be changed to adjust the dryness of the wet saturated steam evaporated by the evaporator 11. When the dryness detection device 51 detects that the dryness of the wet saturated steam deviates from the preset dryness, the deviation information can be transmitted to the second regulating valve 71, the second regulating valve 71 changes the opening degree thereof to regulate the flow of the fluid passing through the bypass pipeline, and further changes the temperature of the fluid entering the evaporator 11, so that the dryness of the wet saturated steam obtained by heat exchange of the evaporator 11 is adapted to the preset dryness, and further the accurate regulation of the dryness of the wet saturated steam is realized.
Further preferably, the second regulating valve 71 is a one-way valve to allow fluid flow from the first preheating conduit towards the second evaporating conduit. The arrangement mode of the check valve can prevent the fluid in the evaporator 11 from flowing back into the preheater, so that the use safety and the heat exchange stability of the whole equipment are ensured.
The outlet of the first preheating pipeline is also connected with a diversion pipeline, and a third regulating valve for regulating the flow of softened water is arranged on the diversion pipeline. Wherein the diversion pipeline is used for discharging softened water which is not heated to the preheating temperature. That is, when the system is just running, the temperature of the softened water conveyed through the first preheating pipe does not reach the preset requirement, and at this time, in order to avoid the softened water with too low temperature entering the evaporation device 1, the softened water which does not reach the preset temperature can be discharged from the diversion pipe. When the temperature of the softened water supplied through the first preheating pipe reaches a preset temperature, the third regulating valve is closed, and the softened water flows into the evaporation apparatus 1.
It will be appreciated that the inlet end of the vaporising device 1 should be provided with a shut-off valve and that in combination with the above embodiments the molten salt delivery device 2 further comprises second temperature detection means for detecting the temperature of the softened water flowing out through the outlet of the first pre-heating conduit. When the second temperature detecting means detects that the temperature of the softened water flowing out through the first preheating pipe is lower than the preset temperature, the shut-off valve is closed to prevent the softened water of low temperature from entering the evaporation apparatus 1. When the second temperature detection device detects that the temperature of the softened water flowing out through the first preheating pipeline reaches the preset temperature, the stop valve is opened, so that the softened water reaching the temperature can enter the evaporation equipment 1 to exchange heat.
Correspondingly, when the second temperature detection device detects that the temperature of the softened water flowing out through the first preheating pipeline is lower than the preset temperature, the third regulating valve is opened, so that the softened water with low temperature flows out through the diversion pipeline, and the softened water with low temperature is prevented from entering the evaporation equipment 1. When the second temperature detection device detects that the temperature of the softened water flowing out through the first preheating pipeline reaches the preset temperature, the third regulating valve is closed, so that the softened water reaching the temperature can completely enter the evaporation equipment 1 to exchange heat.
The molten salt heated direct flow wet saturated steam generating system further comprises a pressure relief device arranged to release fluid in the evaporation device 1 as well as superheated steam when the softened water transporting device 4 is deactivated.
Under this kind of design mode, after softened water conveying equipment 4 stop work, can release fluid and superheated steam in the evaporation equipment 1 through pressure relief equipment to avoid overheated wet saturated steam flow to the oil field steam injection system, eliminate the potential safety hazard, guarantee the steam injection system safe operation, and, superheated steam can open under low pressure, avoid the potential safety hazard and the noise pollution that high-pressure exhaust produced.
As a possible embodiment, the pressure relief device comprises a pressure relief pipe 8 communicating with the outlet of the first preheating pipe and a first pressure relief valve 81 provided on the pressure relief pipe 8, the first pressure relief valve 81 being arranged to open when the softened water transporting device 4 stops transporting the softened water, and the evaporation device 1 being arranged such that when the first pressure relief valve 81 is open, fluid in the second heat exchanging pipe can flow to the pressure relief pipe 8. In this design mode, after the system is stopped, the softened water conveying device 4 stops working, at this time, the first pressure release valve 81 is opened after receiving the stop signal of the softened water conveying device 4, so that the liquid in the second heat exchange pipeline flows to the pressure release pipeline 8 and then flows to the designated position, and the pressure of the system is reduced.
Further optimally, the outlet of the pressure relief pipe 8 is connected with a discharge diffuser 82. This design makes it possible for the liquid in the second heat exchange line to be retained in the discharge diffuser 82 in the evaporation apparatus 1, thus achieving a system pressure relief. The discharge expansion vessel 82 is a device that can be installed at the outlet of the pressure relief pipe 8 to realize continuous liquid discharge, pressure reduction and expansion, and is of conventional design in the art, so its specific structure and working principle will not be described in detail herein.
The pressure relief device comprises an exhaust conduit 9 communicating with the steam output conduit 5 and a second relief valve 91 provided on the exhaust conduit 9, the second relief valve 91 being arranged to open when the pressure in the steam output conduit 5 is below a preset pressure. Under this kind of design mode, after the system shut down, first relief valve 81 opens to make the liquid flow direction in the second heat transfer pipeline pressure release pipeline 8, at this moment, the pressure in the system reduces, and then makes the pressure in the steam output pipeline 5 reduce, until the pressure in the steam output pipeline 5 is less than the presupposes pressure after, second relief valve 91 opens, at this moment, exhaust pipe 9 is in open state, superheated steam in the evaporation equipment 1 will flow through exhaust pipe 9, and then avoid superheated steam to enter into the steam injection well.
The steam output pipe 5 is provided with a pressure detection device 52 for detecting the pressure of the circulating wet saturated steam, and the pressure detection device 52 is electrically connected to the second relief valve 91. The design mode can detect the pressure of the wet saturated steam conveyed by the steam output pipeline 5 in real time through the pressure detection device 52, and the conveying condition of the wet saturated steam can be visually known to workers.
The pressure detecting device 52 may be a pressure gauge, and the pressure gauge should be a pressure gauge suitable for high temperature environment, so as to ensure the service life of the pressure gauge.
In addition, pressure sensing device 52 may also be a pressure transmitter. The pressure transmitter is comprised of three parts, namely, a load cell sensor (also known as a pressure sensor), measurement circuitry, and process connection. The sensor can convert physical pressure parameters such as gas, liquid and the like sensed by the load cell sensor into standard electrical signals (such as 4-20 mADC and the like) so as to supply secondary instruments such as an indication alarm instrument, a recorder, a regulator and the like for measurement, indication and process regulation. In the present application, the pressure transmitter is used to detect the pressure of the wet saturated steam in the steam output pipe 5, and the pressure transmitter is electrically connected to the second pressure release valve 91, so that the pressure in the steam output pipe 5 is reduced to a certain set value, and the pressure transmitter signal interlocks to open the second pressure release valve 91.
When the pressure detecting means 52 detects that the pressure of the wet saturated steam is lower than the preset pressure, the second relief valve 91 is opened. Specifically, the pressure detecting device 52 is electrically connected to the second relief valve 91 to realize linkage between the pressure detecting device 52 and the second relief valve 91, and when the pressure detecting device 52 detects that the pressure of the wet saturated steam is lower than the preset pressure, the second relief valve 91 is opened.
Under this kind of design mode, the second relief valve 91 is in normally closed state, after the system is shut down, and softened water conveying equipment 4 stop work, and first relief valve 81 opens so that pressure release pipeline 8 is in the circulation state, and at this moment, the liquid in the second heat transfer pipeline of evaporation equipment 1 flows out through pressure release pipeline 8 to realize the instantaneous release of fused salt heating steam generation system internal pressure. At this time, since the pressure in the molten salt heating steam generating system is reduced so that the pressure of the steam output pipeline 5 is reduced, when the pressure detecting device 52 detects that the pressure of the wet saturated steam is lower than the preset pressure, the second pressure release valve 91 is opened so that the superheated steam in the evaporation equipment 1 can flow out through the exhaust pipeline 9, the superheated steam is prevented from entering the oilfield steam injection system, and the safe operation of the steam injection system is ensured.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (20)
1. A molten salt heated direct current wet saturated steam generation system, comprising:
an evaporation device (1) having a first heat exchange line and a second heat exchange line;
the molten salt conveying equipment (2) comprises a molten salt conveying device communicated with the inlet of the first heat exchange pipeline and a molten salt recycling device communicated with the outlet of the first heat exchange pipeline, and the molten salt conveying equipment (2) is arranged to be capable of adjusting the temperature and flow of molten salt entering the first heat exchange pipeline;
a preheating device (3) having a first preheating conduit in communication with the inlet of the second heat exchange conduit, the outlet of the second heat exchange conduit being connected with a steam output conduit (5), the preheating device (3) being arranged to be able to preheat the liquid within the first preheating conduit, and the preheating device (3) being arranged to be able to regulate the temperature of the fluid output via the first preheating conduit;
a softened water transporting device (4) for transporting softened water into the first preheating pipe, and the softened water transporting device (4) is configured to be able to adjust the flow rate of softened water transported into the first preheating pipe;
dryness adjusting equipment comprises an adjusting piece and a dryness detecting device (51) arranged on the steam conveying pipeline, wherein the adjusting piece is arranged to be capable of adjusting dryness of wet saturated steam obtained after heat exchange of fluid through the evaporating equipment (1) according to dryness information of the wet saturated steam fed back by the dryness detecting device (51).
2. The molten salt heating direct-current wet saturated steam generation system according to claim 1, wherein the molten salt conveying device comprises a molten salt storage tank, a molten salt conveying pipeline (21) and a first flow rate adjusting device, a molten salt pump (22) is arranged on the molten salt conveying pipeline (21), and the first flow rate adjusting device is used for adjusting the working frequency of the molten salt pump (22).
3. The molten salt heating direct-current wet saturated steam generating system according to claim 2, characterized in that the first flow rate adjusting device comprises a molten salt flow meter (23) arranged on the molten salt conveying pipeline (21) and a frequency converter (24) electrically connected with the molten salt pump (22), the frequency converter (24) being arranged to be able to adjust the operating frequency of the molten salt pump (22) according to flow rate information fed back by the molten salt flow meter (23).
4. The molten salt heating direct-current wet saturated steam generation system according to claim 1, wherein the softened water transporting device (4) comprises a liquid storage tank (41), a liquid transporting pipe (42) and a second flow rate adjusting device, a transporting pump (43) is arranged on the liquid transporting pipe (42), and the second flow rate adjusting device is used for adjusting the opening degree of the transporting pump (43).
5. The molten salt heating direct-flow wet saturated steam generating system according to claim 4, characterized in that the second flow rate adjusting means comprises a liquid flow meter (44) provided on the liquid conveying pipe (42), the conveying pump (43) being arranged to be able to adjust the opening degree of the conveying pump (43) according to flow rate information fed back by the liquid flow meter (44).
6. Molten salt heated direct flow wet saturated steam generating system according to claim 1, characterized in that the preheating device (3) further has a second preheating conduit, the inlet of which communicates with the steam output conduit (5), the outlet of which communicates with the softened water transporting device (4).
7. The molten salt heating direct-flow wet saturated steam generating system according to claim 6, characterized in that the preheating device (3) further comprises a condensate conveying pipe (31) and a condensate regulating valve (32) provided on the condensate conveying pipe (31), the outlet of the second preheating pipe being in communication with the softened water conveying device (4) through the condensate conveying pipe (31) and configured to:
the temperature of the fluid output from the first preheating pipe can be adjusted by adjusting the opening degree of the condensate adjusting valve (32).
8. The molten salt heating direct-flow wet saturated steam generating system according to claim 7, characterized in that the preheating device (3) further comprises a first temperature detecting means for detecting the temperature of the fluid flowing out through the outlet of the first preheating pipe, the first temperature detecting means being electrically connected with the condensate regulating valve, the condensate regulating valve being arranged to be able to regulate the opening of the condensate regulating valve in accordance with temperature information fed back by the first temperature detecting means.
9. Molten salt heated direct current wet saturated steam generating system according to claim 6, characterized in that the steam output pipe (5) communicates with the inlet of the second preheating pipe through a return pipe (6), the return pipe (6) being connected with a steam delivery device (61).
10. Molten salt heated direct current wet saturated steam generating system according to claim 1, characterized in that the evaporation device (1) comprises an evaporator (11),
the first heat exchange pipeline comprises a first evaporation pipeline arranged in the evaporator (11), an inlet of the first evaporation pipeline is communicated with the molten salt conveying device, and an outlet of the first evaporation pipeline is communicated with the molten salt recycling device;
The second heat exchange pipeline comprises a second evaporation pipeline arranged in the evaporator (11), an inlet of the second evaporation pipeline is communicated with an outlet of the first preheating pipeline, and an outlet of the second evaporation pipeline is communicated with the steam output pipeline (5).
11. Molten salt heated direct current wet saturated steam generating system according to claim 10, characterized in that the evaporation device (1) further comprises a heater (12),
the first heat exchange pipeline further comprises a first heating pipeline arranged inside the heater (12), an inlet of the first heating pipeline is communicated with an outlet of the first evaporation pipeline, and an outlet of the first heating pipeline is communicated with the molten salt recovery device;
the second heat exchange pipeline further comprises a second heating pipeline arranged inside the heater (12), an inlet of the second heating pipeline is communicated with an outlet of the first preheating pipeline, and an outlet of the second heating pipeline is communicated with an inlet of the second evaporation pipeline.
12. The molten salt heating direct-flow wet saturated steam generating system according to claim 11, wherein the molten salt conveying device (2) further comprises a molten salt bypass pipeline (25), an inlet of the molten salt bypass pipeline (25) is communicated with the molten salt conveying device, an outlet of the molten salt bypass pipeline (25) is communicated with an outlet of the first evaporation pipeline, and a first regulating valve for regulating the flow of molten salt is arranged on the molten salt bypass pipeline (25).
13. The molten salt heating direct-flow wet saturated steam generating system according to claim 12, characterized in that the molten salt conveying apparatus (2) further comprises a second temperature detecting device for detecting the temperature of the molten salt flowing out through the first evaporation pipe, the first regulating valve is electrically connected with the second temperature detecting device, and the first regulating valve is arranged to be capable of regulating the opening degree of the first regulating valve according to temperature information fed back by the second temperature detecting device.
14. The molten salt heating direct-flow wet saturated steam generating system according to claim 11, characterized in that the regulating member comprises a softened water bypass line (7) and a second regulating valve (71) provided on the softened water bypass line (7), an inlet of the softened water bypass line (7) is communicated with an outlet of the first preheating pipe, an outlet of the softened water bypass line (7) is communicated with an inlet of the second evaporation pipe, and the second regulating valve (71) is provided to be able to regulate an opening degree of the second regulating valve (71) according to dryness information of wet saturated steam fed back by the dryness detecting device (51).
15. The molten salt heating direct-flow wet saturated steam generation system of claim 1, wherein the outlet of the first preheating pipeline is further connected with a diversion pipeline, and a third regulating valve for regulating the flow of softened water is arranged on the diversion pipeline.
16. The molten salt heated direct current wet saturated steam generating system according to any one of claims 1 to 15, characterized in that it further comprises a pressure relief device arranged to release the fluid and superheated steam inside the evaporation device (1) when the softened water transporting device (4) is deactivated.
17. The molten salt heated direct current wet saturated steam generating system according to claim 16, characterized in that the pressure relief device comprises a pressure relief pipe (8) communicating with the outlet of the first preheating pipe and a first pressure relief valve (81) provided on the pressure relief pipe (8), the first pressure relief valve (81) being arranged to open when the softened water transporting device (4) stops transporting softened water, and the evaporation device (1) being arranged such that when the first pressure relief valve (81) is open, fluid in the second heat exchange pipe can flow to the pressure relief pipe (8).
18. Molten salt heated direct current wet saturated steam generating system according to claim 17, characterized in that the outlet of the pressure relief pipe (8) is connected with a discharge diffuser (82).
19. Molten salt heated direct current wet saturated steam generating system according to claim 16, characterized in that the pressure relief device comprises an exhaust conduit (9) communicating with the steam output conduit (5) and a second pressure relief valve (91) provided on the exhaust conduit (9), the second pressure relief valve (91) being arranged to open when the pressure in the steam output conduit (5) is below a preset pressure.
20. Molten salt heated direct current wet saturated steam generating system according to claim 19, characterized in that the steam output pipe (5) is provided with pressure detection means (52) for detecting the pressure of the circulating wet saturated steam, the pressure detection means (52) being electrically connected to the second pressure relief valve (91) and configured to:
when the pressure detection device (52) detects that the pressure of the wet saturated steam is lower than a preset pressure, the second pressure release valve (91) is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311330136.4A CN117146249A (en) | 2023-10-13 | 2023-10-13 | Molten salt heating direct-flow type wet saturated steam generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311330136.4A CN117146249A (en) | 2023-10-13 | 2023-10-13 | Molten salt heating direct-flow type wet saturated steam generation system |
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| Publication Number | Publication Date |
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| CN117146249A true CN117146249A (en) | 2023-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311330136.4A Pending CN117146249A (en) | 2023-10-13 | 2023-10-13 | Molten salt heating direct-flow type wet saturated steam generation system |
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| Country | Link |
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| CN (1) | CN117146249A (en) |
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2023
- 2023-10-13 CN CN202311330136.4A patent/CN117146249A/en active Pending
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