CN217421298U - Thermal power generating unit system based on sand heat storage - Google Patents
Thermal power generating unit system based on sand heat storage Download PDFInfo
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- CN217421298U CN217421298U CN202221647288.8U CN202221647288U CN217421298U CN 217421298 U CN217421298 U CN 217421298U CN 202221647288 U CN202221647288 U CN 202221647288U CN 217421298 U CN217421298 U CN 217421298U
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Abstract
The utility model belongs to the technical field of thermal power generation, and discloses a thermal power generating unit system based on sand heat storage, which comprises a thermal power generating electronic system and a sand heat storage and release subsystem, wherein the thermal power generating subsystem comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine low-pressure cylinder, a low-pressure heater, a deaerator and a high-pressure heater which are sequentially connected in series according to the work direction and the flow direction; the sand heat storage subsystem comprises a low-temperature sand storage tank, a steam-sand heat exchanger, a high-temperature sand storage tank and a steam generator which are sequentially connected in series according to the flow direction of a working medium. The system is provided with a sand heat storage and release system around the thermal power generating unit, when the unit needs to reduce load and adjust peak, part of steam heat of the thermal power generating unit is stored in sand, so that the load change of the thermal power generating unit is not influenced by the lowest stable combustion load of a boiler, and the peak adjusting range of the thermal power generating unit is enlarged; when the unit does not need to reduce load peak regulation, the heat of sand is used for heating the supplied water to generate steam, so that the fuel consumption of the unit is reduced, and the energy utilization efficiency of the unit is improved.
Description
Technical Field
The utility model belongs to the technical field of thermal power, a thermal power unit system based on sand heat-retaining is related to.
Background
The construction of a novel power system mainly based on new energy is an important means for realizing carbon neutralization and carbon peak reaching. With the access of a large amount of renewable energy to a power grid, the characteristics of the intermittence, the volatility and the inverse peak regulation of the renewable energy enable a thermal power generating unit to take new roles in the future, on one hand, a capacity channel needs to be set out by pressing down the load in a large power generation period of the new energy, on the other hand, the power supply of load protection needs to be improved in a small power generation period of the new energy, and thus the operating load range of the existing thermal power generating unit needs to be improved. The method is an effective means for configuring energy storage for the thermal power generating unit, mainly comprises electrochemical energy storage, molten salt energy storage and the like, and mainly has the defects of high energy storage cost and short service life for the electrochemical energy storage; the defects of high condensation prevention cost and large operation power consumption mainly exist for molten salt energy storage. Therefore, a low-cost and high-adaptability heat storage medium is required to be coupled with a thermal power generating unit, so that the operating load range of the unit is economically improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a thermal power generating unit system based on sand heat-retaining.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize: the thermal power generating unit system based on sand heat storage comprises a thermal power generation electronic system and a sand heat storage and release subsystem; wherein:
the thermal power generation subsystem comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine medium-low pressure cylinder, a low-pressure heater, a deaerator and a high-pressure heater which are sequentially connected in series according to the flow direction;
the sand heat storage subsystem comprises a low-temperature sand storage tank, a steam-sand heat exchanger, a high-temperature sand storage tank and a steam generator which are sequentially connected in series according to the flow direction of a working medium;
the outlet of the superheater of the boiler is connected with the steam inlet of the steam-sand heat exchanger, and the steam outlet of the steam-sand heat exchanger is connected with the inlet of the reheater of the boiler; and the water supply outlet of the high-pressure heater is also connected with the water supply inlet of the steam generator, and the steam outlet of the steam generator is connected with the steam inlet of the high-pressure cylinder of the steam turbine.
The main steam outlet of the boiler is connected with the steam inlet of the high-pressure cylinder of the steam turbine, the steam outlet of the high-pressure cylinder of the steam turbine is connected with the inlet of the reheater of the boiler, the outlet of the reheater of the boiler is connected with the steam inlet of the medium/low-pressure cylinder of the steam turbine, and the high-pressure cylinder of the steam turbine and the medium/low-pressure cylinder of the steam turbine are both connected with the generator and are used for jointly driving the generator to generate electricity; the steam outlet of the turbine medium/low pressure cylinder is connected with a low pressure heater, a deaerator and a high pressure heater in sequence, and the high pressure heater is connected with the inlet of a preheater of a boiler.
The heights of the low-temperature sand storage tank, the steam-sand heat exchanger and the high-temperature sand storage tank are sequentially reduced, and low-temperature sand enters a sand inlet of the steam-sand heat exchanger from the low-temperature sand storage tank based on the gravity; the high-temperature sand after heat exchange enters a sand inlet of the steam generator based on the gravity; and a sand suction pump is arranged at the outlet of the steam generator, and the low-temperature sand subjected to heat exchange is conveyed to a low-temperature sand storage tank.
Regulating valves are arranged on pipelines from an outlet of a boiler superheater to a steam inlet of the steam-sand heat exchanger, from a feed water outlet of the high-pressure heater to a feed water inlet of the steam generator, from the low-temperature sand storage tank to the steam-sand heat exchanger and from the high-temperature sand storage tank to the steam generator.
The steam outlet of the steam generator is provided with temperature and pressure sensors.
The particle diameter of sand in the sand heat storage and release system is less than 5mm, and the working temperature of a sand medium is 200-800 ℃.
The steam-sand heat exchanger and the steam generator are arranged in a multi-stage series-parallel mode.
The design temperature of the low-temperature sand storage tank is 300 ℃; the design temperature of the high-temperature sand storage tank is 800 ℃.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a thermal power unit system based on sand heat-retaining, dispose one set of sand and store the thermal subsystem and couple with the thermal power unit around the thermal power unit, when the thermal power unit needs to reduce the load peak shaving, can draw the steam of part thermal power unit out with the sand heat transfer, store part heat in the sand, make the load change of thermal power unit not influenced by the minimum steady burning load of boiler, increase the peak shaving scope of thermal power unit, improve the operation flexibility of thermal power unit by a wide margin; when the thermal power unit does not need to reduce load and adjust peak, the heat of sand can be used for heating the water supply to generate steam, the heat stored in the sand is returned to the thermal power unit, the fuel consumption of the unit is reduced, the energy utilization efficiency of the unit is improved, and the economy of the thermal power unit is improved; the sand medium is cheap and easy to obtain, is safe and stable, and is particularly suitable for areas where a large amount of sand for heat storage is easy to obtain.
Drawings
Fig. 1 is a schematic structural diagram of a thermal power unit system based on sand heat storage according to the present invention;
wherein: 1-thermal power generation subsystem; 2-sand heat storage subsystem; 11-a boiler; 12-a high-pressure cylinder of the steam turbine; 13-turbine medium/low pressure cylinder; 14-a generator; 15-a low pressure heater; 16-a deaerator; 17-a high pressure heater; 21-a low-temperature sand storage tank; 22-steam-sand heat exchanger; 23-high temperature sand storage tank; 24-a steam generator; 31-a first valve; 32-a second valve; 33-a third valve; 34-fourth valve.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the system of the present invention comprises a thermal power generation subsystem 1 and a sand heat storage subsystem 2; wherein: the thermal power generation subsystem comprises a boiler 11, a steam turbine high-pressure cylinder 12, a steam turbine medium-low pressure cylinder 13, a low-pressure heater 15, a deaerator 16 and a high-pressure heater 17 which are sequentially connected in series according to the work-to-flow direction; the sand heat storage subsystem comprises a low-temperature sand storage tank 21, a steam-sand heat exchanger 22, a high-temperature sand storage tank 23 and a steam generator 24 which are sequentially connected in series according to the flow direction of a working medium.
A main steam outlet of the boiler 11 is connected with a steam inlet of a high-pressure steam turbine cylinder 12, a steam outlet of the high-pressure steam turbine cylinder 12 is connected with a reheater inlet of the boiler 11, a reheater outlet of the boiler 11 is connected with a steam inlet of a medium/low-pressure steam turbine cylinder 13, and the high-pressure steam turbine cylinder 12 and the medium/low-pressure steam turbine cylinder 13 are both connected with a generator and are used for driving the generator to generate electricity together; the steam outlet of the turbine middle/low pressure cylinder 13 is connected with a low pressure heater 15, a deaerator 16 and a high pressure heater 17 in sequence, and is connected with the inlet of a preheater of the boiler 11.
The superheater outlet of the boiler 11 is also connected with the steam inlet of the steam-sand heat exchanger 22, and the steam outlet of the steam-sand heat exchanger 22 is connected with the reheater inlet of the boiler 11; the feed water outlet of the high pressure heater 17 is also connected to the feed water inlet of the steam generator 24, and the steam outlet of the steam generator 24 is connected to the steam inlet of the steam turbine high pressure cylinder 12.
The low-temperature sand storage tank 21 is positioned at the highest position of the space, the steam-sand heat exchanger 22 is positioned at the lower part of the low-temperature sand storage tank, and low-temperature sand can enter a sand inlet of the steam-sand heat exchanger 22 from the low-temperature sand storage tank 21 according to the action of gravity; the high-temperature sand storage tank 23 is positioned at the lower part of the steam-sand heat exchanger 22, and the heat-exchanged high-temperature sand can enter a sand inlet of the steam generator 24 under the action of gravity; the steam generator 24 is located at the lowest part of the space, and a sand suction pump is arranged at the outlet of the steam generator and can convey the low-temperature sand after heat exchange to the low-temperature sand storage tank 21.
Regulating valves are arranged on pipelines from an outlet of a superheater of the boiler 11 to a steam inlet of a steam-sand heat exchanger 22, from a water supply outlet of a high-pressure heater 17 to a water supply inlet of a steam generator 24, from a low-temperature sand storage tank 21 to the steam-sand heat exchanger 22 and from a high-temperature sand storage tank 23 to the steam generator 24; the steam outlet of the steam generator 24 is provided with temperature and pressure sensors.
As an optional embodiment, the sand particle diameter in the sand heat storage and release system is less than 5mm, and the working temperature of a sand medium is 200-800 ℃; the steam-sand heat exchanger 22 and the steam generator 24 are arranged in a multistage series-parallel manner; the design temperature of the low-temperature sand storage tank 21 is 300 ℃; the design temperature of the high temperature sand storage tank 23 is 800 ℃.
The working process and the principle of the utility model are as follows:
when the load of the thermal power generating unit needs to be reduced and the peak load is regulated, a regulating valve is arranged on a pipeline from a main steam outlet of the boiler 11 to steam of the steam-sand heat exchanger 22, part of the steam is led out from the main steam outlet of the boiler 1 to enter the heat exchanger to exchange heat with low-temperature sand, and the flow of the led-out steam is controlled by controlling the opening of the regulating valve, so that the load of the thermal power generating unit is regulated and controlled; and regulating valves are arranged on pipelines from the low-temperature sand storage tank 21 to the steam-sand heat exchanger 22, the low-temperature sand enters the heat exchanger to exchange heat with the steam under the action of gravity, and the flow of the sand entering the heat exchanger is controlled by controlling the opening of the regulating valves, so that the temperature of the sand at the outlet of the heat exchanger is controlled. Through the heat exchange between the steam and the sand in the heat exchanger, the transfer of the steam heat to the sand is realized, so that the low-temperature sand is heated into high-temperature sand which is stored in a high-temperature sand storage tank.
When the thermal power generating unit needs load reduction and peak load regulation, a regulating valve is arranged on a pipeline from a feed water outlet of the high-pressure heater 17 to the steam generator 24, part of high-pressure feed water is led out from the outlet of the high-pressure heater and enters the steam generator to exchange heat with high-temperature sand, and the flow of the led-out high-pressure feed water is controlled by controlling the opening of the regulating valve; be equipped with the adjusting valve on the pipeline of high temperature sand storage tank 23 to steam generator 24, utilize the action of gravity to make high temperature sand get into steam generator and feedwater heat transfer, the flow of the sand that gets into the heat exchanger through the aperture control of control adjusting valve, realize steam generator export steam temperature's control. The heat transfer of sand heat to the water supply is realized through the heat exchange between the sand and the water supply in the steam generator, steam is generated, the high-pressure water supply is heated into high-temperature steam, and the high-temperature sand returns to the low-temperature sand storage tank after releasing heat.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (8)
1. The thermal power unit system based on sand heat storage is characterized by comprising a thermal power generation subsystem (1) and a sand heat storage subsystem (2); wherein:
the thermal power generation subsystem comprises a boiler (11), a steam turbine high-pressure cylinder (12), a steam turbine medium/low-pressure cylinder (13), a low-pressure heater (15), a deaerator (16) and a high-pressure heater (17) which are sequentially connected in series according to the flow direction of a working medium;
the sand heat storage subsystem comprises a low-temperature sand storage tank (21), a steam-sand heat exchanger (22), a high-temperature sand storage tank (23) and a steam generator (24) which are sequentially connected in series according to the flow direction of a working medium;
the outlet of the superheater of the boiler (11) is connected with the steam inlet of the steam-sand heat exchanger (22), and the steam outlet of the steam-sand heat exchanger (22) is connected with the inlet of the reheater of the boiler (11); the feed water outlet of the high-pressure heater (17) is also connected with the feed water inlet of the steam generator (24), and the steam outlet of the steam generator (24) is connected with the steam inlet of the steam turbine high-pressure cylinder (12).
2. The thermal power unit system based on sand heat storage according to claim 1, wherein a superheater outlet of the boiler (11) is connected with a steam inlet of a high-pressure turbine cylinder (12), a steam outlet of the high-pressure turbine cylinder (12) is connected with a reheater inlet of the boiler (11), a reheater outlet of the boiler (11) is connected with a steam inlet of a medium/low-pressure turbine cylinder (13), and the high-pressure turbine cylinder (12) and the medium/low-pressure turbine cylinder (13) are both connected with a generator and are used for jointly driving the generator to generate electricity; the steam exhaust port of the turbine medium/low pressure cylinder (13) is sequentially connected with a low-pressure heater (15), a deaerator (16) and a high-pressure heater (17), and the high-pressure heater (17) is connected with the inlet of a preheater of the boiler (11).
3. The thermal power unit system for storing heat based on sand according to claim 1, wherein the heights of the low-temperature sand storage tank (21), the steam-sand heat exchanger (22) and the high-temperature sand storage tank (23) are sequentially lowered, and the low-temperature sand enters a sand inlet of the steam-sand heat exchanger (22) from the low-temperature sand storage tank (21) based on gravity; the heat-exchanged high-temperature sand enters a sand inlet of the steam generator (24) based on the gravity; and a sand suction pump is arranged at the outlet of the steam generator, and the low-temperature sand subjected to heat exchange is conveyed to a low-temperature sand storage tank (21).
4. The thermal power unit system based on sand heat storage according to claim 1, wherein regulating valves are arranged on pipelines from an outlet of a superheater of a boiler (11) to a steam inlet of a steam-sand heat exchanger (22), from a feed water outlet of a high-pressure heater (17) to a feed water inlet of a steam generator (24), from a low-temperature sand storage tank (21) to the steam-sand heat exchanger (22) and from a high-temperature sand storage tank (23) to the steam generator (24).
5. The sand-based thermal power plant system according to claim 1, wherein a steam outlet of the steam generator (24) is provided with temperature and pressure sensors.
6. The sand-based thermal power unit system for storing heat according to claim 1, wherein the particle size of sand in the sand heat storage and release system is less than 5mm, and the operating temperature of a sand medium is 200-800 ℃.
7. The sand-based thermal power generating unit system for storing heat according to claim 1, wherein the steam-sand heat exchanger (22) and the steam generator (24) are arranged in series and in parallel in multiple stages.
8. The sand-based thermal power generating unit system for storing heat according to claim 1, wherein the design temperature of the low-temperature sand storage tank (21) is 300 ℃; the design temperature of the high-temperature sand storage tank (23) is 800 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221647288.8U CN217421298U (en) | 2022-06-29 | 2022-06-29 | Thermal power generating unit system based on sand heat storage |
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| CN202221647288.8U CN217421298U (en) | 2022-06-29 | 2022-06-29 | Thermal power generating unit system based on sand heat storage |
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| CN202221647288.8U Active CN217421298U (en) | 2022-06-29 | 2022-06-29 | Thermal power generating unit system based on sand heat storage |
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