CN209944279U - Direct-flow evaporation system for solar photo-thermal power generation - Google Patents
Direct-flow evaporation system for solar photo-thermal power generation Download PDFInfo
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- CN209944279U CN209944279U CN201920490957.7U CN201920490957U CN209944279U CN 209944279 U CN209944279 U CN 209944279U CN 201920490957 U CN201920490957 U CN 201920490957U CN 209944279 U CN209944279 U CN 209944279U
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Abstract
The utility model discloses a straight-flow evaporation system for solar photothermal power, include by pipe connection's evaporimeter, separator and overheated reheater and not include steam pocket and pre-heater, evaporimeter and overheated reheater are the spiral winding tubular heat exchanger of vertical arrangement, and heat medium in evaporimeter and the overheated reheater walks shell side and water and/or steam and walks the pipe side, and the heating of the steam that comes from the separator and the heating of the cold reheat steam that comes from the steam turbine all go on at overheated reheater. The steam drum and the preheater are not arranged, the number of the heat exchangers is reduced, all the heat exchangers are vertical equipment, and heat transfer media can be automatically discharged from the lower part by means of gravity when the machine is stopped, so that the starting and stopping speed and the load change speed of the system are improved; the process is compact and reasonable, and the superheater and the reheater are combined into one device, so that the device investment and the operation and maintenance cost are reduced; the heat exchange tubes in the heat exchangers are wound and arranged to have good flexibility, and the problem of temperature difference stress on the side of the tube shell can be solved without arranging expansion joints.
Description
Technical Field
The utility model relates to a solar photothermal power's technical field, more specifically say, relate to a straight-flow evaporation system for solar photothermal power.
Background
The photo-thermal power generation is a novel utilization mode of solar energy, and has the advantage of providing a good-quality power supply through heat storage. Conventional light and heat power station vaporization system is most including equipment such as pre-heater, evaporimeter, steam pocket, over heater, re-heater, and it opens and stops and become load speed slowly, and light and heat power station vaporization system has the demand of opening and stopping every day again, and the problem that reduces light resource utilization efficiency because of opening and stopping speed is just more outstanding. Therefore, it is necessary to design a straight-flow type photothermal power station evaporation system to improve the start-stop rate.
On the other hand, with the further improvement of the performance of the heat transfer medium and the optimization of the heat utilization of the whole plant, the improvement of the parameter improvement efficiency of the evaporation system becomes practical. As the pressure and capacity of the evaporation system increase, it is also necessary to design a once-through evaporation system.
In order to solve the problems of heat transfer medium exhaust and temperature difference stress on the side of the equipment tube shell, the traditional solutions comprise a scheme that a vertical straight tube heat exchanger is provided with an expansion joint and a scheme that a horizontal U-shaped tube heat exchanger is provided. For the former scheme, the expansion joint is always a weak link; with the latter solution, it is difficult to drain the equipment because some of the equipment is provided with a shell-side baffle.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides a can solve the clean problem of row, can also solve the direct current type vaporization system that is used for solar photothermal power of difference in temperature stress problem under the prerequisite that does not set up the expansion joint.
The utility model provides a straight-flow evaporation system for solar photothermal power, straight-flow evaporation system includes by pipe connection's evaporimeter, separator and overheated reheater and does not include steam drum and pre-heater, evaporimeter and overheated reheater are the spiral winding tubular heat exchanger of vertical arrangement, wherein, heat transfer medium in evaporimeter and the overheated reheater walks shell side and water and/or steam and walks the pipe side, and the heating of the steam that comes from the separator and the heating of the cold reheat steam that comes from the steam turbine are all in overheated reheater goes on.
According to the utility model discloses an embodiment of straight-flow evaporation system for solar photothermal power, straight-flow evaporation system still includes water-feeding pump and electric heater, the water-feeding pump sets up on the water supply pipe of evaporimeter, electric heater sets up on the separation water return line between separator and evaporimeter, separation water return line still is provided with the drainage branch pipe.
According to the utility model discloses an embodiment of straight-flow evaporation system for solar photothermal power, the pipe side of overheat reheater be provided with steam inlet and reheat steam inlet and respectively through the heat exchange tube with steam inlet and the continuous steam outlet of reheat steam inlet, a plurality of layers the heat exchange tube is arranged in the barrel of overheat reheater around the axle core spiral winding at overheat reheater center, and the spiral direction of adjacent layer heat exchange tube is opposite, and wherein, the heat exchange tube between steam inlet and the steam outlet walks the steam that comes from the separator, and the heat exchange tube between reheat steam inlet and the reheat steam outlet walks the cold reheat steam that comes from the steam turbine.
According to the utility model discloses an embodiment of straight-flow evaporation system for solar photothermal power, the axle core is fixed on the barrel of overheated reheater by fixed spacing unit, is provided with control interval's filler strip between the adjacent layer heat exchange tube, steam inlet and reheat steam inlet and steam outlet and reheat steam outlet all are provided with the tube sheet of being connected with the heat exchange tube.
According to the utility model discloses an embodiment of straight-flow evaporation system for solar photothermal power, the shell side of overheated reheater is provided with heat transfer medium entry and heat transfer medium export, the heat transfer medium entry is connected with high temperature heat transfer medium storage tank, the heat transfer medium export is passed through the heat transfer medium pipeline and is connected with the evaporimeter.
According to the utility model discloses an embodiment of straight-flow evaporation system for solar photothermal power, the tube side of evaporimeter is provided with the water inlet and exports a plurality of layers with the soda of water inlet connection through the heat exchange tube, the heat exchange tube is arranged in the barrel of evaporimeter round the axle core spiral winding at evaporimeter center, and the spiral opposite direction of adjacent layer heat exchange tube, the water inlet is connected and is connected with the water supply source through water supply pipe and water feed pump and through separation water return pipe and electric heater and separator, the soda exports and is connected with the separator through soda delivery pipeline.
According to the utility model discloses an embodiment of straight-flow evaporation system for solar photothermal power, the axle core is fixed on the barrel of evaporimeter by fixed spacing unit, is provided with control interval's filler strip between the adjacent layer heat exchange tube, feedwater entry and soda export all are provided with the tube sheet of being connected with the heat exchange tube.
According to the utility model discloses an embodiment of straight-flow evaporation system for solar photothermal power, the shell side of evaporimeter is provided with heat transfer medium entry and heat transfer medium export, the heat transfer medium entry is connected with overheated re-heater through the heat transfer medium pipeline, the heat transfer medium export is connected with low temperature heat transfer medium storage tank.
According to the utility model discloses an embodiment of straight-flow evaporation system for solar photothermal power, heat transfer medium gets into the shell side of overheated re-heater from upper portion and flows out from the lower part after with the steam countercurrent flow of pipe side, and heat transfer medium gets into the shell side of evaporimeter from upper portion and flows out from the lower part after with the water countercurrent flow of pipe side.
According to the utility model discloses an embodiment of straight-flow evaporation system for solar photothermal power, the feedwater gets into the pipe side of evaporimeter and is heated into the steam-water mixture with the heat transfer medium countercurrent flow heat transfer of shell side from the lower part and flows out from the upper portion after, the steam that steam-water mixture got from the upper portion entering separator after separation gets into the pipe side of overheated reheater from the lower part after the top is discharged and is discharged from the upper end with the heat transfer medium countercurrent flow heat transfer of shell side and go to the steam turbine, the cold reheat steam that comes from the steam turbine gets into the pipe side of overheated ware from the lower part and is heated into behind the heat transfer medium countercurrent flow reheat heat transfer of shell side and follow the upper portion after the reheat steam and discharge to the steam turbine.
Compared with the prior art, the utility model is used for solar photothermal power's straight-flow evaporation system has following beneficial effect:
1) the starting and stopping speed and the load changing speed of the system are improved, the flow is compact and reasonable, the superheater and the reheater are combined into one device, and the device investment and the operation and maintenance cost are reduced;
2) the number of the heat exchangers is reduced, all the heat exchangers are vertical equipment, and heat transfer media can be automatically discharged from the lower part by means of gravity when the machine is stopped;
3) because the heat exchange tubes in each heat exchanger are wound and arranged to have good flexibility, the problem of temperature difference stress on the side of the tube shell can be solved without arranging expansion joints.
Drawings
Fig. 1 shows a flow chart of a structure of a once-through evaporation system for solar photo-thermal power generation according to an exemplary embodiment of the present invention.
Fig. 2 shows a schematic structural diagram of an overheat reheater in a once-through evaporation system for solar photo-thermal power generation according to an exemplary embodiment of the present invention.
Description of reference numerals:
1-a superheat reheater, 10 a-a steam outlet, 10 b-a reheat steam outlet, 11-a shaft core, 12-a cylinder, 13 a-a saturated steam inlet, 13 b-a reheat steam inlet, 14-a tube plate, 15-a fixed limiting unit, 16-a heat exchange tube and 17-a filler strip;
2-evaporator, 3-separator, 4-water supply pump, 5-electric heater, 6 a-water supply pipeline, 6 b-steam-water conveying pipeline, 6 c-separated water return pipeline, 6 d-steam conveying pipeline, 6 e-drainage branch pipe and 7-heat transfer medium pipeline.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The solar photothermoelectric standing evaporation system of the present invention will be specifically described and illustrated below.
Fig. 1 shows a flow chart of a structure of a once-through evaporation system for solar photo-thermal power generation according to an exemplary embodiment of the present invention.
As shown in fig. 1, according to an exemplary embodiment of the present invention, the vertical evaporation system of a solar photothermal power station includes an evaporator 2, a separator 3 and a superheating reheater 1 connected by pipes and does not include a drum and a preheater. The evaporator 2 in the utility model is a vertical spiral winding tubular heat exchanger which plays the role of a preheater and an evaporator in a conventional evaporation system; the superheat reheater 1 is a multi-flow vertical spiral winding tubular heat exchanger, a tube bundle of the superheat reheater is divided into two parts, wherein one part of tubes are used for sending reheat steam, and the rest of tubes are used for sending steam from a separator, and the superheat reheater 1 can be specifically distributed according to heat exchange areas required by a superheater and a reheater, and has the functions of a superheater and a reheater in a common system; the separator 3 is a cylindrical container, and the steam-water mixture enters from the tangential direction and then is separated, steam is discharged from the top, and water is discharged from the bottom.
Furthermore, the heat transfer medium in the superheating reheater 1 and evaporator 2 of the present invention is preferably molten salt, and the shell side and the tube side are water and/or steam. According to the utility model discloses, evaporating system's heat transfer medium all walks the shell side, because the operating pressure of heat transfer medium fused salt is much lower than the pressure of water and/or steam, so compare with the scheme that water and/or steam walked the shell side, the utility model discloses can reduce equipment metal consumption and reduce the power consumption of electric tracing to reduce power station working costs and improve economic nature
And because all heat exchangers of this vaporization system are vertical equipment, the heat transfer medium fused salt can rely on gravity to discharge from the lower part is automatic when shutting down, and the risk of stifled pipe does not exist even there is a small amount of heat transfer medium fused salt to remain in the shell side also can not cause the damage to equipment to the heat transfer medium fused salt shell side. Moreover, the heat exchange tubes in the heat exchangers are arranged in a winding way and have good flexibility, and the problem caused by poor expansion of the tube shell side can be solved without arranging expansion joints
The utility model discloses in not setting up steam pocket and pre-heater, only realize preheating and the effect of evaporation through evaporimeter 2. Wherein, in order to avoid the solidification of the heat transfer medium, the water working medium is preferably heated to a set temperature in advance before the heat transfer medium enters the system. Therefore, the utility model discloses a through-flow evaporation system can also include feed pump 4 and electric heater 5, and feed pump 4 sets up on the water supply line 6a of evaporimeter 2, and electric heater 5 sets up on the separation water return line 6c between separator 3 and evaporimeter 2. At this time, the feed pump 4, the evaporator 2, the separator 3 and the electric heater 7 are connected through pipelines to form a loop, the feed pump 4 provides circulating power for feeding water, the electric heater 7 is used for continuously heating the circulating water to vaporize the circulating water, the heated and separated steam enters the overheating reheater 1, a valve of an outlet pipeline of the overheating reheater 1 is closed, and the pressure and the temperature of the steam can be gradually increased until the temperature reaches a set temperature. Then the heat transfer medium starts to enter the system, and the system enters the normal working condition after the electric heater 5 is closed. Further, the separated water return pipe 6c is also provided with a drain branch pipe 6e to perform a drain treatment of the separator drain water when the electric heater 7 is not required.
The overheating reheater 1 adopted in the evaporation system is realized by integrating the functions of the superheater and the reheater into one device, so that the investment and operation and maintenance costs of devices, pipelines, electric tracing, instruments, valves and the like are greatly reduced, and the evaporation system has good economical efficiency. The overheating reheater is a multi-flow vertical spiral winding tube type heat exchanger, a heat exchange tube bundle of the overheating reheater is divided into two parts, heat exchange tubes of certain layers or certain layers are used for removing reheating steam, and other heat exchange tubes are used for removing steam from a separator and can be distributed according to heat exchange areas needed by the superheater and the reheater. Although the heat load ratio of the superheater and the reheater are slightly different under different working conditions, the difference is small, and the steam outlet temperature is within an acceptable range.
Fig. 2 shows a schematic structural diagram of an overheat reheater in a once-through evaporation system for solar photo-thermal power generation according to an exemplary embodiment of the present invention.
As shown in fig. 2, a structure of the spiral-wound tube heat exchanger will be described by taking the superheating reheater 1 as an example. The tube side of the superheat reheater 1 is provided with a steam inlet 13a and a reheat steam inlet 13b, and a steam outlet 10a and a reheat steam outlet 10b connected to the steam inlet 13a and the reheat steam inlet 13b, respectively, through heat exchange tubes 16, and several layers of heat exchange tubes 16 are spirally wound around a central axis 11 of the superheat reheater 1 and arranged in a cylinder 12 of the superheat reheater 1. Preferably, the spiral directions of the adjacent heat exchange tubes are opposite, so that a plurality of heat exchange tube bundles with different diameters and the center of the shaft core are formed.
The heat exchange tube bundle of the superheating reheater 1 can be divided into two parts according to heat transfer requirements, wherein one part of the heat exchange tube bundle is used for carrying steam from the separator 3 to take the function of a superheater, and the other part of the heat exchange tube bundle is used for carrying cold reheat steam from a steam turbine to take the function of a reheater. Therefore, the heat exchange tube 16 between the steam inlet 13a and the steam outlet 10a takes steam, the heat exchange tube 16 between the reheat steam inlet 13b and the reheat steam outlet 10b takes reheat steam, and the steam inlet 13a is connected to the separator 3 through the steam delivery pipe 6 d.
The shaft core 11 is fixed on the cylinder 12 of the overheating reheater 1 by a fixed limiting unit 15, a filler strip 17 for controlling the distance is arranged between adjacent heat exchange tubes 16, and the tube plates 14 connected with the heat exchange tubes 16 are arranged on the steam inlet 13a and the reheated steam inlet 13b and the steam outlet 10a and the reheated steam outlet 10 b.
The shell side of the superheating reheater 1 is provided with a heat transfer medium inlet and a heat transfer medium outlet, the heat transfer medium inlet is connected with a high-temperature heat transfer medium storage tank (not shown), and the heat transfer medium outlet is connected with the evaporator 3 through a heat transfer medium pipeline 7.
The evaporator 2 has a structure substantially similar to that of the superheating reheater 1 except that only one steam-water inlet and outlet is provided except for a heat transfer medium inlet and outlet. Furthermore, the heat transfer medium in the evaporator 2 and water are also subjected to countercurrent heat exchange.
Specifically, a feed water inlet and a steam water outlet connected with the feed water inlet through heat exchange tubes are arranged on the tube side of the evaporator 2, a plurality of layers of heat exchange tubes are spirally wound around a central shaft core of the evaporator 2 and are arranged in a cylinder of the evaporator 2, the spiral directions of adjacent layers of heat exchange tubes are opposite, the feed water inlet is connected with a feed water source through a feed water pipeline 6a and a feed water pump 4 and is connected with the separator 3 through a separated water return pipeline 6c and an electric heater 5, and the steam water outlet is connected with the separator 3 through a steam water conveying pipeline 6 b. Similarly, the shaft core is also fixed on the barrel of the evaporator 2 by a fixed limiting unit, filler strips for controlling the distance are arranged between adjacent heat exchange tubes, and the water supply inlet and the steam-water outlet are both provided with tube plates connected with the heat exchange tubes. The shell side of the evaporator 2 is provided with a heat transfer medium inlet and a heat transfer medium outlet, the heat transfer medium inlet is connected with the superheating reheater 1 through a heat transfer medium pipe 7, and the heat transfer medium outlet is connected with a low-temperature heat transfer medium storage tank (not shown).
The utility model improves the starting and stopping speed and the load changing speed of the system, has compact and reasonable flow, combines the superheater and the reheater into one device, and reduces the device investment and the operation and maintenance cost; the number of the heat exchangers is reduced, all the heat exchangers are vertical equipment, and heat transfer media can be automatically discharged from the lower part by means of gravity when the machine is stopped.
The following describes the heat transfer medium flow and the steam flow of the straight-flow evaporation system for solar photo-thermal power generation of the present invention.
The heat transfer medium enters the shell side of the superheating reheater 1 from the upper part, flows out from the lower part after countercurrent heat exchange with steam on the tube side, and enters the shell side of the evaporator 2 from the upper part, performs countercurrent heat exchange with water on the tube side, and flows out from the lower part. The heat transfer medium entering the overheating reheater 1 is high-temperature molten salt stored with solar energy, and the heat transfer medium flowing out of the evaporator 2 is low-temperature molten salt after heat exchange.
Feed water enters a tube side of the evaporator 2 from the lower part and flows out from the upper part after being heated into a steam-water mixture through countercurrent heat exchange with a heat transfer medium on a shell side, steam obtained by separating the steam-water mixture after entering the separator 3 from the upper part is discharged from the top part, enters a tube side of the superheat reheater 1 from the lower part and is discharged to a steam turbine from the upper end after being subjected to countercurrent heat exchange with the heat transfer medium on the shell side, and cold reheat steam from the steam turbine enters the tube side of the superheat reheater from the lower part and is heated into hot reheat steam after being subjected to countercurrent heat exchange with the heat transfer medium on the shell side, and then the hot reheat steam is discharged to the.
To sum up, the straight-flow evaporation system for solar photo-thermal power generation of the utility model is a straight-flow evaporation system without a steam pocket, thereby improving the starting and stopping speed and the variable load speed of the system; all the heat exchangers are spirally wound tube type heat exchangers and are vertically arranged, and heat transfer media can be automatically discharged from the lower part by means of gravity when the machine is stopped; in all heat exchangers, the heat transfer medium is taken from the shell side and the water and/or steam is taken from the tube side, and the superheating of saturated steam and the heating of reheated steam are completed in the same heat exchanger.
The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. The direct-flow evaporation system for solar photo-thermal power generation is characterized by comprising an evaporator, a separator and a superheating reheater which are connected by pipelines and not comprising a steam drum and a preheater, wherein the evaporator and the superheating reheater are spiral wound tubular heat exchangers which are vertically arranged, heat transfer media in the evaporator and the superheating reheater run from the shell side and water and/or steam run from the tube side, and heating of steam from the separator and heating of cold reheated steam from a steam turbine are carried out by the superheating reheater.
2. The once-through evaporation system for solar photothermal power according to claim 1, further comprising a feed water pump disposed on a feed water pipe of the evaporator, and an electric heater disposed on a separated water return pipe between the separator and the evaporator.
3. The once-through evaporation system for solar photothermal power of claim 1, wherein the tube side of the superheat reheater is provided with a steam inlet and a reheat steam inlet, and a steam outlet and a reheat steam outlet connected with the steam inlet and the reheat steam inlet through heat exchange tubes, respectively, and a plurality of layers of the heat exchange tubes are spirally wound around a central axis of the superheat reheater and arranged in a cylinder of the superheat reheater, wherein the heat exchange tubes of adjacent layers are opposite in spiral direction, wherein the heat exchange tubes between the steam inlet and the steam outlet remove the steam from the separator, and the heat exchange tubes between the reheat steam inlet and the reheat steam outlet remove the cold reheat steam from the steam turbine.
4. The direct-flow evaporation system for solar photothermal power of claim 3, wherein the shaft core is fixed on the barrel of the superheating reheater by a fixed limiting unit, a filler strip for controlling the distance is arranged between adjacent heat exchange tubes, and the steam inlet and the reheated steam inlet and the steam outlet and the reheated steam outlet are provided with tube plates connected with the heat exchange tubes.
5. The once-through evaporation system for solar photothermal power of claim 3, wherein the shell side of the superheating reheater is provided with a heat transfer medium inlet and a heat transfer medium outlet, the heat transfer medium inlet is connected with a high temperature heat transfer medium storage tank, and the heat transfer medium outlet is connected with the evaporator through a heat transfer medium pipeline.
6. The direct-flow evaporation system for solar photothermal power of claim 2, wherein the tube side of the evaporator is provided with a feed water inlet and a steam water outlet connected with the feed water inlet through a heat exchange tube, a plurality of layers of the heat exchange tubes are spirally wound around the central axis of the evaporator and arranged in the barrel of the evaporator, the heat exchange tubes of adjacent layers have opposite spiral directions, the feed water inlet is connected with a feed water source through a feed water pipe and a feed water pump and is connected with the separator through a separated water return pipe and an electric heater, and the steam water outlet is connected with the separator through a steam water delivery pipe.
7. The direct-flow evaporation system for solar photothermal power of claim 6, wherein the shaft core is fixed on the barrel of the evaporator by a fixed limiting unit, a filler strip for controlling the distance is arranged between adjacent heat exchange tubes, and the water supply inlet and the vapor-water outlet are both provided with tube plates connected with the heat exchange tubes.
8. The once-through evaporation system for solar photothermal power of claim 6, wherein the shell side of the evaporator is provided with a heat transfer medium inlet and a heat transfer medium outlet, the heat transfer medium inlet is connected with the superheating reheater through a heat transfer medium pipe, and the heat transfer medium outlet is connected with the low-temperature heat transfer medium storage tank.
9. The once-through evaporation system for solar photothermal power according to claim 1, wherein the heat transfer medium enters the shell side of the superheating reheater from the upper portion and flows out from the lower portion after being subjected to heat-counterflow exchange with the steam on the tube side, and the heat transfer medium enters the shell side of the evaporator from the upper portion and flows out from the lower portion after being subjected to heat-counterflow exchange with the water on the tube side.
10. The once-through evaporation system for solar photothermal power of claim 1, wherein feed water enters the tube side of the evaporator from the lower portion and flows out from the upper portion after being heated by heat transfer medium in countercurrent with the shell side to form a steam-water mixture, steam obtained by separation of the steam-water mixture after entering the separator from the upper portion is discharged from the top portion, enters the tube side of the superheater reheater from the lower portion after being subjected to countercurrent heat transfer with the heat transfer medium in the shell side and is discharged to the turbine from the upper portion, and cold reheat steam from the turbine enters the tube side of the superheater from the lower portion after being subjected to countercurrent heat transfer with the heat transfer medium in the shell side to be heated to hot reheat steam and is discharged to the turbine from the upper portion.
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| CN201920490957.7U CN209944279U (en) | 2019-04-12 | 2019-04-12 | Direct-flow evaporation system for solar photo-thermal power generation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030538A (en) * | 2019-04-12 | 2019-07-19 | 东方电气集团东方锅炉股份有限公司 | A kind of single flow vapo(u)rization system for solar light-heat power-generation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030538A (en) * | 2019-04-12 | 2019-07-19 | 东方电气集团东方锅炉股份有限公司 | A kind of single flow vapo(u)rization system for solar light-heat power-generation |
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