CN116025884A - Peak regulation and frequency modulation system of thermal power plant with fused salt heat storage participation - Google Patents
Peak regulation and frequency modulation system of thermal power plant with fused salt heat storage participation Download PDFInfo
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- CN116025884A CN116025884A CN202310036148.XA CN202310036148A CN116025884A CN 116025884 A CN116025884 A CN 116025884A CN 202310036148 A CN202310036148 A CN 202310036148A CN 116025884 A CN116025884 A CN 116025884A
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Abstract
The invention discloses a system for regulating peak and modulating frequency of a thermal power plant with participation of molten salt heat storage, which comprises a thermal power plant self-power system, a high-temperature steam-molten salt heat exchanger, a high-voltage electric heating device, a molten salt pump, a high-temperature molten salt tank, a low-temperature molten salt tank, an evaporator, a flow-through preheater, a reheater, a superheater and a steam drum, wherein the thermal power plant self-power system is connected with the high-temperature electric heating device, the high-temperature electric heating device is connected with the high-temperature steam-molten salt heat exchanger, the high-temperature steam-molten salt heat exchanger is respectively connected with the boiler low-temperature reheater and the high-temperature molten salt tank, the high-temperature molten salt tank is connected with the reheater, the reheater is connected with the superheater, the evaporator is connected with the low-temperature molten salt tank, the low-temperature molten salt tank is connected with the piezoelectric heating device, deaerator water is connected with the flow-through preheater, the flow-through preheater is connected with the evaporator, and the evaporator is connected with the steam drum. The invention is provided with a high-voltage heating device, keeps certain power to run according to the solar frequency modulation capacity and the frequency modulation mileage, and has the frequency modulation capability.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a peak regulation and frequency modulation system of a thermal power plant with molten salt heat storage participation.
Background
Previously, a thermal power plant is an energy main body and is responsible for generating electricity, but the electric energy cannot be stored, namely, the amount of electricity which is needed to be used is more, the amount of electricity which is needed to be used is less, the power plant always catches up with the load to be regulated, the electricity load of a region always fluctuates throughout the day, peaks and valleys exist, and the power plant is in peak regulation along with the process of regulating the output.
With the development of the power industry in China, the capacity of each power grid is continuously enlarged, and the composition of the power grid is changed. The annual increment speed of municipal domestic electricity is larger than that of industrial electricity, and the specific gravity of industrial electricity is gradually reduced. Meanwhile, new energy (photovoltaic, wind power and other various types of wind power) is rapidly developed, and traditional thermal power generation (including nuclear power) and new energy power generation are more complicated in the aspect of power grid allocation. At present, the new energy power generation internet surfing rate must be increased, and peak shaving of a thermal generator set becomes important. Therefore, the reasonable power grid peak regulation is an important measure for guaranteeing the safety of the power grid, the electricity utilization stability and the national energy safety, and has great significance.
At present, the main technical means for peak regulation of the thermal power plant in China mainly comprise the steps of improving the fineness of the pulverized coal, improving the uniformity of the pulverized coal, increasing the wall temperature monitoring of a water-cooled wall, increasing the number of plasma ignition burners, increasing a micro-oil ignition system, a turbine bypass heating technology, a low-pressure cylinder cutting technology and the like, and meanwhile, increasing heat storage equipment and electricity storage equipment is also an important mode for peak regulation of the thermal power plant.
The main heat storage modes at present comprise water heat storage, magnesia heat storage and fused salt heat storage, and the three heat storage modes participate in the peak regulation contrast conditions of the thermal power plant as follows:
| sequence number | Project | Molten salt heat storage | Magnesia brick heat storage | Water heat storage | Remarks |
| 1 | Heat storage temperature | 140-560℃ | 100-600℃ | 10-100℃ | |
| 2 | Thermal storage form | High-temperature steam and electric heating equipment | Electric heating | High-temperature steam electrode boiler | |
| 3 | Form of heat release | High temperature steam | Hot air | Hot water | |
| 4 | System efficiency | 97% | 80% | 90% | |
| 5 | Service life of the product | Theoretically, the material has no upper limit and can be recycled | 8-15 | There is no upper limit in theory |
Compared with two technical routes of magnesia brick heat accumulation and water heat accumulation, the fused salt heat accumulation participates in peak shaving of a thermal power plant, and has the advantages of proper heat accumulation temperature, capability of providing high-temperature and high-pressure steam, electricity capable of accumulating high-temperature steam, long service life, high overall project economy and the like.
The thermal power generating unit needs to reduce the output of the boiler in a power generation load reducing state, when the combustion working condition of the boiler is far lower than the designed minimum stable running load, the temperature of a hearth can be rapidly reduced, so that the rapid ignition of coal dust is difficult, the flame stability is further poor, important potential safety hazards such as flameout, hearth extinguishment and blasting are easily caused, the minimum stable combustion load given by the boiler delivery is determined by the condition of the designed coal for combustion, and the minimum stable combustion load of the boiler in the actual situation is limited by various main factors such as coal fluctuation. Along with gradual reduction of fuel in the deep peak shaving process, the temperature in the boiler gradually reduces, and the combustion working condition can be more severe, so that the risk of boiler extinguishment is easily generated.
Meanwhile, the deep peak shaving has larger impact and potential safety hazard on the steam turbine. Along with the reduction of load in the deep peak regulation process, the fuel quantity is reduced, the steam temperature is reduced, and especially in the process of converting the dry state of a boiler into the wet state, the steam temperature superheat degree is insufficient easily, the water impact of a steam turbine is easily caused, and the potential safety hazard is large.
Disclosure of Invention
The invention aims to provide a system for regulating the peak and frequency of a thermal power plant with participation of molten salt heat storage, which is provided with a high-voltage heating device, keeps certain power to run according to solar frequency modulation capacity and frequency modulation mileage and has frequency modulation capability at any time. When the thermal power plant needs frequency modulation, the electric heating device in the fused salt heat storage system can be directly started, and rapid frequency modulation is realized.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a salt heat accumulation participates in thermal power plant peak regulation frequency modulation system, includes thermal power plant from electrical system, high temperature steam-salt heat exchanger, high pressure electric heating device, molten salt pump, high temperature salt tank, low temperature salt tank, evaporimeter, flow through preheater, reheat ware, superheater, steam drum, thermal power plant from electrical system is connected with high pressure electric heating device, high temperature electric heating device is connected with high temperature steam-salt heat exchanger, high temperature steam-salt heat exchanger is connected with boiler low temperature reheat ware, high temperature salt tank respectively, high temperature salt tank is connected with the reheat ware, the reheat ware is connected with the superheater, the superheater is connected with the evaporimeter, the evaporimeter is connected with low temperature salt tank, low temperature salt tank is connected with piezoelectric heating device, the deaerator comes water to flow through preheater, flow through preheater is connected with the evaporimeter, the evaporimeter is connected with the steam drum respectively with the superheater, flow through preheater is connected with the deaerator, the steam drum is connected with the medium pressure jar through the reheat ware, the medium pressure is connected with low pressure heating system.
Further, a molten salt pump is connected between the high-temperature molten salt tank and the reheater.
Further, a molten salt pump is connected between the low-temperature molten salt tank and the piezoelectric heating device.
Further, a water supply pump is connected between the deaerator water supply and the flowing preheater.
Compared with the prior art, the invention has the beneficial effects that: the high-voltage heating device is configured in the invention, and the high-voltage heating device keeps certain power running according to the solar frequency modulation capacity and the frequency modulation mileage and has the frequency modulation capability at any time. When the thermal power plant needs frequency modulation, the electric heating device in the fused salt heat storage system can be directly started, and rapid frequency modulation is realized.
The invention replaces the electrode boiler, hot water heat storage and magnesia brick heat storage in the heat storage peak shaving system of the existing thermal power plant, and compared with the two systems, the fused salt energy storage peak shaving system has the following advantages:
(1) The fused salt heat storage peak shaving system occupies small area, and can save a large amount of precious land resources of a power plant;
(2) The system efficiency is high. Compared with the two heat storage systems, the efficiency of the fused salt heat storage peak shaving system is improved by about 12%, the energy utilization efficiency is greatly improved, and energy conservation is realized;
(3) The magnesia brick heat storage and release form is hot air, the water heat storage and release form is hot water, and the fused salt heat storage and peak shaving system is used for supplying steam outwards, so that the magnesia brick heat storage and release form perfectly fits a steam system of a thermal power plant, and has higher coupling property and higher matching degree with an own system of the thermal power plant;
(4) The magnesia brick heat storage and water heat storage have large application limitation, are more suitable for thermal power plants which are responsible for heating tasks, and are not suitable for condensing power plants. The fused salt heat storage system can be coupled with a thermal power plant, can also be coupled with a condensing power plant, and has a larger market;
(5) The most important advantage is that the fused salt heat storage peak shaving system can be used throughout the year. The magnesium brick heat storage and water heat storage are more suitable for peak shaving in heating seasons of thermal power plants and have lower matching degree in other stages.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. the self-power-consumption system of the thermal power plant comprises a self-power-consumption system 2, a high-temperature steam-molten salt heat exchanger 3, a high-voltage electric heating device 4, a molten salt pump 5, a high-temperature molten salt tank 6, a low-temperature molten salt tank 7, an evaporator 8, a preheater 9, a reheater 10, a superheater 11, a water supply pump 12 and a steam drum.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a system for peak regulation and frequency modulation of a thermal power plant with molten salt heat storage is characterized in that: the system comprises a self-power-consumption system 1 of a thermal power plant, a high-temperature steam-molten salt heat exchanger 2, a high-temperature electric heating device 3, a molten salt pump 4, a high-temperature molten salt tank 5, a low-temperature molten salt tank 6, an evaporator 7, a flow-through preheater 8, a reheater 9, a superheater 10 and a steam drum 12, wherein the self-power-consumption system 1 of the thermal power plant is connected with the high-temperature electric heating device 3, the high-temperature electric heating device 3 is connected with the high-temperature steam-molten salt heat exchanger 2, the high-temperature steam-molten salt heat exchanger 2 is respectively connected with a boiler low-temperature reheater and the high-temperature molten salt tank 5, the high-temperature molten salt tank 5 is connected with the reheater 9, the reheater 9 is connected with the superheater 10, the superheater 10 is connected with the evaporator 7, the evaporator 7 is connected with the low-temperature molten salt tank 6, the low-temperature molten salt tank 6 is connected with the electric heating device 3, deoxygenated water is connected with the flow-through preheater 8, the preheater 8 is connected with the evaporator 7, the evaporator 7 is connected with the steam drum 12, the flow-through preheater 12 is respectively connected with the superheater 10 and the flow-through preheater 8, the flow-through the preheater 8 is connected with the deoxygenator the evaporator 12, the reheater is connected with the superheater 10, the superheater 10 is connected with the low-pressure boiler through the superheater 10, and the superheater 10 is connected with the medium-pressure chamber through the superheater 10.
And a molten salt pump 4 is connected between the high-temperature molten salt tank 5 and the reheater 9.
A molten salt pump 4 is connected between the low-temperature molten salt tank 6 and the piezoelectric heating device 3.
A water supply pump 11 is connected between the deaerator water supply and the flow-through preheater 8.
Working principle:
and (3) heat storage process: the heat accumulation process of the system has two conditions, namely, high-temperature and high-pressure steam from a boiler passes through a high-temperature steam-fused salt heat exchanger 2 to accumulate heat for fused salt in a fused salt heat accumulation system, and the steam enters a boiler low-temperature reheater after heat exchange is completed; and secondly, a self-power-consumption system 1 of the thermal power plant supplies power to a fused salt electric heating device 3, and the fused salt is heated by the electric heating device 3 to store heat. The molten salt works through the molten salt pump 4, starts from the low-temperature molten salt tank 6, and the low-temperature molten salt respectively passes through the electric heating device 3 and the high-temperature steam-molten salt heat exchanger 2, then enters the high-temperature molten salt tank 5, and the heat accumulation is completed.
According to the peak regulation or frequency modulation requirements of the thermal power plant, the two heat storage modes can be carried out simultaneously or separately. The peak regulation and frequency modulation tasks of the thermal power plant can be completed in the heat storage process.
The heat release process is as follows: the fused salt after the heat accumulation is stored in the high-temperature fused salt tank 5. Starting from the high-temperature molten salt tank 5, under the action of the molten salt pump 4, high-temperature molten salt sequentially flows through the reheater 9, the superheater 10 and the evaporator 7 to finish heat exchange, enters the low-temperature molten salt tank 6 to become low-temperature molten salt, meanwhile, deaerator water sequentially flows through the preheater 8, the evaporator 7, the steam drum 12, the superheater 10 and the reheater 9 under the action of the water supply pump 11, finally becomes high-temperature high-pressure steam through three-stage heat exchange with the high-temperature molten salt, enters a low-pressure cylinder and a medium-pressure cylinder of a steam turbine of a thermal power plant, supplements the output of a boiler and promotes the acting of the steam turbine.
In addition, 2-stage heat exchange is completed before the incoming water of the deaerator passes through the reheater 9, and the steam temperature reaches the temperature and pressure requirements of industrial steam and central heating of a building, so that the steam can be replaced or supplemented by steam extraction of a boiler to supply the steam outwards, the output of the boiler is reduced for the second time, and the peak shaving of a thermal power plant is assisted.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A peak regulation and frequency modulation system of a thermal power plant is participated in fused salt heat storage, which is characterized in that: the system comprises a self-power-consumption system of a thermal power plant, a high-temperature steam-molten salt heat exchanger, a high-temperature electric heating device, a molten salt pump, a high-temperature molten salt tank, a low-temperature molten salt tank, an evaporator, a flow-through preheater, a reheater, a superheater and a steam drum, wherein the self-power-consumption system of the thermal power plant is connected with the high-temperature electric heating device, the high-temperature electric heating device is connected with the high-temperature steam-molten salt heat exchanger, the high-temperature steam-molten salt heat exchanger is respectively connected with a low-temperature reheater and the high-temperature molten salt tank of a boiler, the high-temperature molten salt tank is connected with the reheater, the reheater is connected with the superheater, the superheater is connected with the evaporator, the steam drum is respectively connected with the superheater and the flow-through the preheater, the steam drum is connected with the deaerator, the superheater is connected with the low-pressure cylinder through the reheater, and the superheater is connected with the heating system.
2. The fused salt heat storage participation thermal power plant peak regulation and frequency modulation system according to claim 1, wherein: and a molten salt pump is connected between the high-temperature molten salt tank and the reheater.
3. The fused salt heat storage participation thermal power plant peak regulation and frequency modulation system according to claim 1, wherein: and a molten salt pump is connected between the low-temperature molten salt tank and the piezoelectric heating device.
4. The fused salt heat storage participation thermal power plant peak regulation and frequency modulation system according to claim 1, wherein: a water supply pump is connected between the deaerator water supply and the flow-through preheater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310036148.XA CN116025884A (en) | 2023-01-10 | 2023-01-10 | Peak regulation and frequency modulation system of thermal power plant with fused salt heat storage participation |
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| CN202310036148.XA CN116025884A (en) | 2023-01-10 | 2023-01-10 | Peak regulation and frequency modulation system of thermal power plant with fused salt heat storage participation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116845933A (en) * | 2023-09-01 | 2023-10-03 | 山西中能天胜科技有限公司 | Power distribution system based on steam heat exchange coupling electrode heating fused salt |
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2023
- 2023-01-10 CN CN202310036148.XA patent/CN116025884A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116845933A (en) * | 2023-09-01 | 2023-10-03 | 山西中能天胜科技有限公司 | Power distribution system based on steam heat exchange coupling electrode heating fused salt |
| CN116845933B (en) * | 2023-09-01 | 2023-11-28 | 山西中能天胜科技有限公司 | Power distribution system based on steam heat exchange coupling electrode heating fused salt |
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