CN212298914U - System for participating in thermal power deep peak regulation by utilizing solid heat storage device - Google Patents
System for participating in thermal power deep peak regulation by utilizing solid heat storage device Download PDFInfo
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- CN212298914U CN212298914U CN202020103115.4U CN202020103115U CN212298914U CN 212298914 U CN212298914 U CN 212298914U CN 202020103115 U CN202020103115 U CN 202020103115U CN 212298914 U CN212298914 U CN 212298914U
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Abstract
The utility model relates to a system for participating in thermal power deep peak shaving by utilizing a solid heat storage device, which comprises a boiler and a steam turbine power generation system with multi-stage steam extraction, and is characterized by comprising the solid heat storage device and a second deaerator; the heat source of the solid heat storage device comes from the boiler and/or the high-pressure cylinder, and the solid heat storage device provides steam for the medium/low-pressure cylinder of the steam turbine power generation system and/or the boiler and/or the low-pressure heater of the steam turbine power generation system and/or the high-pressure heater of the steam turbine power generation system. The system improves the deep peak regulation capability of the thermal power station, has high response speed, meets the requirements of a power grid on quick response and deep peak regulation of the thermal power station, and is suitable for large-scale application in flexible modification of the thermal power station.
Description
Technical Field
The utility model relates to a heat-retaining application technique especially relates to a system for utilize solid heat accumulation device to participate in thermoelectricity degree of depth peak shaving.
Background
With the large-scale integration of renewable energy sources such as hydropower, wind power and photovoltaic, the peak-to-valley difference of a power system is increased, and the necessity of low-load peak regulation operation and rapid load regulation capacity of a thermal power generating unit is required. Under the influence of coal quality, equipment and the like of a power plant, the peak regulation capacity of a thermal power generating unit in China is generally only 40-50% of rated capacity under a pure condensation working condition at present. The flexibility transformation of a thermal power station is urgent, the minimum output of a straight condensing unit is required to reach 30-35% of rated capacity by the flexibility transformation of the thermal power, and the minimum technical output of a unit with good coal quality and equipment under the straight condensing working condition reaches 20-25% of rated capacity. And the deep peak shaving is mainly limited by the low-load stable operation capacity of the boiler and the auxiliary equipment thereof.
Because the peak regulation capacity of the power system to the thermal generator set is higher and higher, for example, when the 1000MW unit is subjected to AGC regulation, the load interval is 550MW to 1000MW, and when the unit participates in deep peak regulation, the load of the unit is required to be reduced to 400MW for operation. At low loads, boilers are prone to a series of risks: low-load combustion instability, overtemperature of a water-cooled wall, easy standard exceeding of flue gas emission, blockage and corrosion of an air preheater, boiler feed water fluctuation and the like.
And the minimum loads of the boiler and the steam turbine are usually inconsistent, so that the steam output of the boiler is greater than the requirement of the steam turbine, excessive steam is generated, and the peak regulation capacity of a unit is influenced. In order to solve the problem, a solid heat storage device is added on the basis of the original thermodynamic system, so that the deep peak regulation of the unit and the super-generation capacity of the unit can be realized.
In view of this, under the condition of low cost, a system combining a solid heat storage technology and a coal-fired power station is provided, and the deep and efficient peak regulation of thermal power can be realized.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a system for utilize solid heat accumulation device to participate in thermal power degree of depth peak regulation, include the boiler and have the multistage steam turbine power generation system that draws steam, a serial communication port, including solid heat accumulation device and second oxygen-eliminating device.
Furthermore, the heat storage input end of the solid heat storage device is connected with the outlet of the boiler and/or the outlet of the high-pressure cylinder of the steam turbine power generation system, and the heat storage output end of the solid heat storage device is connected with the inlet of the boiler.
Further, steam taken out by the solid heat storage device enters a medium/low pressure cylinder of the steam turbine power generation system and/or the boiler and/or a high pressure heater of the steam turbine power generation system and/or a low pressure heater of the steam turbine power generation system to provide a required heat source for the thermal power generation system, and a heat taking inlet of the solid heat storage device is connected with outlets of a first deaerator and a second deaerator of the steam turbine power generation system.
Further, the solid heat storage device comprises a heat storage medium and a heat exchange pipe.
Preferably, the heat storage medium is high-temperature-resistant concrete, and has wide sources and low cost.
Further, when the steam taken out from the solid heat storage device enters the high-pressure heater of the steam turbine power generation system and/or one or more stages of the high-pressure heater of the steam turbine power generation system, heat exchange is carried out.
Further, the solid heat storage device includes a high temperature heat storage device and a medium temperature heat storage device.
Further, the heat storage output end of the high-temperature heat storage device is connected with the heat storage input end of the medium-temperature heat storage device, so that the high-temperature heat storage device stores high-parameter steam, and the medium-temperature heat storage device stores low-parameter steam.
Further, high-temperature steam taken out by the high-temperature heat storage device enters the medium/low pressure cylinder to do work and generate power; and the low-temperature hot water/steam taken out by the medium-temperature heat storage device enters the boiler and/or a high-pressure heater of the steam turbine power generation system and/or a low-pressure heater of the steam turbine power generation system for heat exchange.
The utility model has the advantages as follows:
the utility model provides an utilize system that solid heat accumulation device participated in thermal power degree of depth peak regulation, in this system, the solid heat accumulation device stably provides partial heat for the driving system of thermal power station, and wherein the raw and other materials of solid heat accumulation device mainly are cement, grit etc. and the source is extensive, and is with low costs, can make the system more stable, reduces because the control complexity that the addition of new system leads to. In conclusion, the addition of the solid heat storage device improves the deep peak regulation capability of the thermal power station, has high response speed and meets the requirements of a power grid on quick response and deep peak regulation of the thermal power station.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a first system for participating in thermal power deep peak shaving by using a solid heat storage device;
FIG. 2 is a schematic diagram of a second system for participating in thermal power deep peak shaving by using a solid heat storage device;
FIG. 3 is a schematic diagram showing a third system for participating in thermal power deep peak shaving by using a solid heat storage device
In the figure, 1 is a boiler, 2 is a steam turbine, 21 is a high-pressure cylinder, 22 is a medium/low-pressure cylinder, 3 is a generator, 4 is a condenser, 5 is a solid heat storage device, 51 is a high-temperature solid heat storage device, 52 is a low-temperature solid heat storage device, 6 is a first deaerator, 7 is a second deaerator, 8 is a high-pressure heater, 81 is a primary high-pressure heater, 82 is a secondary high-pressure heater, 83 is a tertiary high-pressure heater, and 9 is a low-pressure heater.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely 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 work belong to the protection scope of the present invention.
Example one
Fig. 1 is a schematic structural diagram of a system for participating in thermal power deep peak shaving by using a solid heat storage device, including: boiler 1 and the turbo generator system that has multistage extraction of steam, turbo generator system includes steam turbine 2, generator 3, condenser 4, first oxygen-eliminating device 6, high pressure feed water heater 8 and low pressure feed water heater 9, its characterized in that, including solid heat storage device 5 and second oxygen-eliminating device 7. The solid heat storage device comprises a heat storage medium and a heat exchange pipeline, wherein the heat storage medium is preferably high-temperature-resistant concrete, raw materials used by the high-temperature-resistant concrete mainly comprise concrete, sand, stone and the like, the cost is low, and the source is wide, so that the cost of the solid heat storage device 5 is 50% or more lower than that of a molten salt heat storage device, and the solid heat storage device is very suitable for large-scale commercial utilization. The second deaerator 7 is located at the front end of a heat taking inlet of the solid heat storage device 5 and used for deaerating a water/steam system so as to guarantee normal and stable operation of the system and prolong the service life of a thermodynamic system pipeline.
In the embodiment, the heat source of the solid heat storage device 5 is extracted from the boiler 1 and/or the high-pressure cylinder 21 of the steam turbine power generation system; the steam taken out from the solid heat storage device 5 can enter a medium/low pressure cylinder of the steam turbine power generation system and/or the boiler and/or a low pressure heater of the steam turbine power generation system and/or a high pressure heater of the steam turbine power generation system, and the connection relationship among the devices is as follows:
the heat storage output end of the solid heat storage device 5 is connected with the outlet of the boiler 1 and/or the outlet of the high-pressure cylinder of the steam turbine power generation system, and the control and the regulation of a heat storage heat source can be specifically controlled through a valve a and a valve f; the heat storage input end of the solid heat storage device 5 is connected with the inlet of the boiler 1. The heat taking output end of the solid heat storage device 5 can be divided into 4 paths, and is respectively controlled and adjusted by a valve d, a valve e, a valve c and a valve g. The first path is connected with an inlet of a medium/low pressure cylinder 22 of the steam turbine power generation system and provides steam for the medium/low pressure cylinder 22 to do work and generate power; the second path is connected with the inlet of the boiler 1 and provides steam with a certain heat value for the boiler; the third path is connected with an inlet of the high-pressure heater 8 and provides heat required by heat exchange for the high-pressure heater 8; the fourth path is connected with the inlet of the low-pressure heater 9 and provides heat required by heat exchange for the low-pressure heater 6. The heat exchange outlets of the high-pressure heater 8 and the low-pressure heater 9 are connected with the inlet of the second deaerator 7, and the outlets of the first deaerator 6 and the second deaerator are connected with the heat taking input end of the solid heat storage device 5.
The principle of operation of this embodiment is as follows:
the heat storage process: when the load of the unit is reduced, the extracted steam of the boiler 1 and/or the high-pressure cylinder 21 is input into the solid heat storage device 5 for storing heat through opening and closing and adjusting a valve a and a valve f, and the water/steam after heat exchange returns to the boiler 1 again for circulation.
The heat extraction process comprises the following steps: opening a valve e, and allowing high-temperature steam output by the solid heat storage device 5 to enter the medium/low pressure cylinder 22 to generate electricity and apply work; opening a valve d, and allowing low-temperature steam output by the solid heat storage device 5 to enter the boiler 1 for reheating; opening a valve c, allowing low-temperature steam output by the solid heat storage device 5 to enter the high-pressure heater 8 for heat exchange to provide a required heat source for the high-pressure heater 8, and allowing cooled water to enter the second deaerator 7 for deaerating; and opening a valve g, allowing low-temperature steam output by the solid heat storage device 5 to enter the low-pressure heater 9 for heat exchange, providing a required heat source for the low-pressure heater 9, and allowing cooled water to enter the second deaerator 7 for deaerating. In the actual production process, one or more of the 4 paths of heat taking going directions can be set, 4 paths can also be set, and the going direction adjustment of the heat taking steam is realized by controlling the opening and closing of the valve d, the valve e, the valve c and the valve g.
It should be noted that the solid heat storage device 5 can adjust the temperature of the hot steam by installing valves and pipes on the hot pipes with different lengths, so as to achieve the purpose of outputting high-temperature steam and low-temperature steam/hot water according to the requirement.
Example two
As shown in fig. 2, in a second schematic structural diagram of a system utilizing a solid heat storage device to participate in thermal power peak shaving, the solid heat storage device 5 is composed of the low-temperature solid heat storage device 52 and the high-temperature solid heat storage device 51, a heat storage output end of the high-temperature heat storage device 52 is connected with a heat storage input end of the medium-temperature heat storage device 51, so that the high-temperature heat storage device 52 stores high-parameter steam, and the medium-temperature heat storage device 51 stores lower-parameter steam.
The heat storage process: the heat storage process in this embodiment is similar to that in the embodiment, except that the heat source enters the high-temperature solid heat storage device 52 for heat storage, then enters the low-temperature solid heat storage device 51 for heat storage, and finally returns to the boiler 1 for circulation.
The heat extraction process comprises the following steps:
and a heat taking working medium enters from the bottom end of the high-temperature heat storage device 52 to perform heat taking and heat exchange, and high-temperature steam is output to enter the medium/low pressure cylinder to perform work and power generation after the temperature is raised. A heat taking working medium enters from the bottom end of the medium-temperature heat storage device 51 to take heat, low-temperature steam/hot water is output, a valve d is opened, and the low-temperature steam/hot water enters into the boiler 1 to be reheated; opening a valve c, allowing the low-temperature steam/hot water to enter the high-pressure heater 8 for heat exchange to provide a required heat source for the high-pressure heater 8, and allowing the cooled water to enter the second deaerator 7 for deaerating; and opening a valve g, allowing low-temperature steam/hot water to enter the low-pressure heater 9 for heat exchange, providing a required heat source for the low-pressure heater 9, and allowing cooled water to enter the second deaerator 7 for deaerating.
Similarly, in the present embodiment, similar to the embodiment, in the practical application process, the output end of the medium-temperature heat storage device 51 may be set to be one or more of three paths as required, and the going direction adjustment of the low-temperature steam/hot water may also be realized by controlling the opening and closing of the valve d, the valve c, and the valve g.
EXAMPLE III
As shown in fig. 3, a third schematic structural diagram of a system that utilizes a solid heat storage device to participate in thermal power deep peak shaving, the medium-temperature heat storage device 52 provides a heat source for a primary high-pressure heater 81 and a secondary high-pressure heater 82 in the high-pressure heater 8 in a power system of an original thermal power station.
The heat storage process in this embodiment is the same as that in the embodiment, and is not described here again, and the heat extraction process is as follows:
the heat removal process of the high-temperature thermal storage device 51 is the same as that of the embodiment. The steam turbine of the original low-pressure heater 9 is not cut off, the heat-taking working medium enters from the bottom end of the medium-temperature heat storage device 52 to carry out heat-taking and heat-exchanging, after the temperature is raised, low-temperature steam is output, a valve c is opened, the low-temperature steam enters the first-stage high-pressure heater 81 and the second-stage high-pressure heater 82 to provide heat required by heat exchanging, and condensed water after heat-exchanging and cooling enters the second deaerator 7 to carry out deaerating.
It should be noted that, in this embodiment, only the heat source required for heat exchange is provided for the first two stages of steam extraction of the high-pressure heater as an example, in actual implementation, the heat source required for heat exchange may be provided for any one stage or multiple stages of the high-pressure heater and the low-pressure heater, and may be combined at will, and the above embodiments all fall within the protection scope of this embodiment.
To sum up, the utility model provides a three embodiment can the cross-over combination use at the practical application in-process, and above each embodiment and arbitrary combination all fall into the protection scope of this embodiment.
The embodiment has the advantages of low comprehensive cost, short response time and high efficiency, carries out time conversion on the heat energy of the original thermal power station so as to meet the requirement of a power grid on deep peak regulation of the thermal power station, and is suitable for flexible transformation of the thermal power station in a large scale.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.
Claims (7)
1. A system for participating in thermal power deep peak shaving by utilizing a solid heat storage device comprises a boiler and a steam turbine power generation system with multi-stage steam extraction, and is characterized by comprising the solid heat storage device and a second deaerator; the heat storage input end of the solid heat storage device is connected with the outlet of the boiler and/or the outlet of the high-pressure cylinder of the steam turbine power generation system, and the heat storage output end of the solid heat storage device is connected with the inlet of the boiler; and steam taken out by the solid heat storage device enters a medium/low pressure cylinder of the steam turbine power generation system and/or the boiler and/or a low-pressure heater of the steam turbine power generation system and/or a high-pressure heater of the steam turbine power generation system to provide a required heat source for the thermal power system, and a heat taking inlet of the solid heat storage device is connected with outlets of a first deaerator and a second deaerator of the steam turbine power generation system.
2. The system for participating in thermal power deep peak shaving with a solid thermal storage device of claim 1, wherein the solid thermal storage device comprises a thermal storage medium and heat exchange piping.
3. The system for participating in thermal power deep peak shaving with a solid thermal storage device of claim 2, wherein the thermal storage medium is refractory concrete.
4. The system for participating in deep thermal power peaking utilizing a solid state thermal storage device according to claim 1, wherein the extracted steam of the solid state thermal storage device enters one or more stages of a high pressure heater of the steam turbine power generation system and/or a low pressure heater of the steam turbine power generation system for heat exchange.
5. The system for participating in thermal power depth peaking using solid state thermal storage devices of claim 1, wherein said solid state thermal storage devices include high temperature thermal storage devices and medium temperature thermal storage devices.
6. The system of claim 5, wherein the heat storage output of the high temperature heat storage device is connected to the heat storage input of the medium temperature heat storage device.
7. The system for participating in thermal power deep peak shaving by utilizing the solid heat storage device as claimed in claim 5, wherein high-temperature steam taken out by the high-temperature heat storage device enters the medium/low pressure cylinder to do work and generate electricity; and the low-temperature hot water/steam taken out by the medium-temperature heat storage device enters the boiler and/or a high-pressure heater of the steam turbine power generation system for heat exchange.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819451A (en) * | 2021-10-15 | 2021-12-21 | 华能(浙江)能源开发有限公司长兴分公司 | System and method for coupling solid thermal storage and steam supply of coal-fired thermal power generating unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819451A (en) * | 2021-10-15 | 2021-12-21 | 华能(浙江)能源开发有限公司长兴分公司 | System and method for coupling solid thermal storage and steam supply of coal-fired thermal power generating unit |
| CN113819451B (en) * | 2021-10-15 | 2023-05-30 | 华能(浙江)能源开发有限公司长兴分公司 | System and method for coupling solid thermal storage and steam supply of coal-fired thermal power unit |
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