CN210319975U - Thermal power generating unit power generation peak regulation system based on steam total heat heating molten salt heat storage - Google Patents
Thermal power generating unit power generation peak regulation system based on steam total heat heating molten salt heat storage Download PDFInfo
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Abstract
The utility model relates to a thermal power generating unit power generation peak shaving system based on heat accumulation of full hot heating fused salt of steam, high temperature fused salt jar, high temperature fused salt pump, low temperature fused salt jar, low temperature fused salt pump, steam sensible heat exchanger, steam latent heat exchanger, boiler reheater, steam turbine high pressure jar, steam turbine intermediate pressure jar, fused salt steam over heater, fused salt steam generator, water pump and oxygen-eliminating device. The utility model has the advantages that: the generating load of the unit is further reduced, the peak load regulation range of the unit is widened, and the operation flexibility of the unit is improved; compared with the existing scheme for improving the combustor and the combustion-supporting system of the boiler, the method has the advantages that the boiler is not modified; compared with the existing peak regulation technology of the heat accumulating type electric boiler, the problem of high energy consumption caused by converting high-quality electric power into hot water or steam is avoided; compared with the storage battery and compressed air energy storage technology, the device has the advantages of more charge-discharge cycle times, no pollution, low investment and the like.
Description
Technical Field
The utility model relates to a thermal power generating unit power generation peak shaving technique mainly is applicable to different capacity thermal power generating unit, including fire coal, living beings, gas combined cycle etc. thermal power pure condensation or heat supply unit.
Background
The peak-to-valley difference of the Zhejiang power grid is gradually increased, the peak-to-valley pressure of a power system is also gradually increased, and the maximum peak-to-valley difference of the uniform-regulating caliber of the Zhejiang power grid in 2018 reaches 2886 ten thousand kilowatts. With the operation of extra-high voltage transmission projects such as Binjin, Ningshao, Zhefu and the like and the increase of new energy power generation installations in Zhejiang, the requirements of the Zhejiang power grid on the flexibility and the reliability of regulation are higher and higher. In the future years, newly added power of the Zhejiang power grid basically does not have peak regulation capability or is poor in peak regulation capability, and the peak regulation capability of the existing thermal power generating unit needs to be excavated urgently to ensure safe and stable operation of the power grid. As a Zhejiang power grid at an extra-high voltage receiving end, deep peak regulation operation of a thermal power generating unit is inevitable in development.
At present, the unit is adjusted and optimized mainly by analyzing operation data, performing field test and the like, the peak regulation capacity of the unit is excavated, and the lowest safe and stable operation load of the thermal power unit can be reduced to 40%. And the boiler stably burns, the powder process system, the steam-water system and the thermal system are transformed, and the lowest load of the thermal power generating unit can reach 35%. Electric power is converted into heat energy through an electric boiler to store heat, so that energy waste is caused, and electric energy consumption devices such as storage batteries and compressed air energy storage devices have the defects of relatively immature technology, high investment, poor safety and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the prior art, excavating current thermal power unit load regulation ability, realizing further reduction unit load of generating electricity, widening unit load regulation scope, improving unit operation flexibility, providing the thermal power unit system of generating electricity peak regulation based on the heat accumulation of the full heat-adding fused salt of steam.
The thermal power generating unit power generation peak regulation system based on steam total heat heating molten salt heat storage comprises a high-temperature molten salt tank, a high-temperature molten salt pump, a low-temperature molten salt tank, a low-temperature molten salt pump, a steam sensible heat exchanger, a steam latent heat exchanger, a boiler reheater, a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder, a molten salt steam superheater, a molten salt steam generator, a water pump and a deaerator; the output end of the low-temperature molten salt tank is connected with the input ends of the sensible heat steam exchanger and the latent heat steam exchanger through a low-temperature molten salt pump, and the output ends of the sensible heat steam exchanger and the latent heat steam exchanger are connected with the input end of the high-temperature molten salt tank; the output end of the boiler reheater is connected with the input ends of the steam sensible heat exchanger and the steam latent heat exchanger, and the output ends of the steam sensible heat exchanger and the steam latent heat exchanger are connected with the input end of the deaerator; the output end of the high-temperature molten salt tank is connected with the input ends of the molten salt steam superheater and the molten salt steam generator through a high-temperature molten salt pump, and the output ends of the molten salt steam superheater and the molten salt steam generator are connected with the input end of the low-temperature molten salt tank; the output ends of the molten salt steam superheater and the molten salt steam generator and a high-pressure cylinder of a steam turbine are connected with the input end of a boiler reheater; the output end of the boiler reheater is connected with the turbine intermediate pressure cylinder.
Preferably, the method comprises the following steps: the high-temperature molten salt tank outputs high-temperature molten salt, the low-temperature molten salt tank outputs low-temperature molten salt, the boiler reheater outputs boiler reheater outlet steam, namely reheated hot section steam, the steam turbine high-pressure cylinder outputs steam turbine high-pressure cylinder exhaust, and the deaerator outputs saturated deaerated water.
The utility model has the advantages that:
(1) for further excavating renewable energy abilities such as thermal power generating unit absorption photovoltaic, wind-powered electricity generation, the utility model discloses a thermal power generating unit electricity generation peak shaving system reaches based on the heat accumulation of steam total heat heating fused salt. When the power generation load of the renewable energy source is increased, partial high-temperature and medium-pressure steam is extracted from the outlet of the boiler reheater to heat the molten salt, and the 'total heat' (namely sensible heat and latent heat of the steam) of the steam is stored in the molten salt, so that the work of the high-temperature steam in the steam turbine is reduced, and the power generation load of a unit is reduced. When the power generation load of the renewable energy source is reduced, the heat stored in the molten salt is released to saturated deoxygenated water coming out of the deaerator, the heat of the high-temperature molten salt is absorbed to generate high-temperature steam, the steam turbine does work, and the power generation load of the unit is increased. When the minimum stable combustion load of the boiler operates, the high-temperature steam is reduced to enter the steam turbine to do work through molten salt heat storage, the power generation load of the unit is further reduced, the peak load regulation range of the unit is widened, and the operation flexibility of the unit is improved.
(2) Compared with the existing scheme for improving the combustor and the combustion-supporting system of the boiler, the method has the advantage that the boiler is not modified.
(3) Compared with the existing peak regulation technology of the heat accumulating type electric boiler, the problem of high energy consumption caused by the fact that high-quality electric power is converted into hot water or steam is solved.
(4) Compared with the storage battery and compressed air energy storage technology, the device has the advantages of more charge-discharge cycle times, no pollution, low investment and the like.
Drawings
FIG. 1 is the thermal power generating unit power generation peak regulation system flow chart based on the heat accumulation of the molten salt of the total heat heating of steam in the embodiment of the utility model.
Description of reference numerals: the method comprises the following steps of 1-high-temperature molten salt tank, 2-high-temperature molten salt pump, 3-low-temperature molten salt tank, 4-low-temperature molten salt pump, 5-steam sensible heat exchanger, 6-steam latent heat exchanger, 7-boiler reheater, 8-steam turbine high pressure cylinder, 9-steam turbine intermediate pressure cylinder, 10-molten salt steam superheater, 11-molten salt steam generator, 12-water pump and 13-deaerator.
Detailed Description
The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
As shown in fig. 1, the thermal power generating unit power generation peak regulation system based on steam total heat heating molten salt heat storage comprises a high-temperature molten salt tank 1, a high-temperature molten salt pump 2, a low-temperature molten salt tank 3, a low-temperature molten salt pump 4, a steam sensible heat exchanger 5, a steam latent heat exchanger 6, a boiler reheater 7, a steam turbine high-pressure cylinder 8, a steam turbine intermediate pressure cylinder 9, a molten salt steam superheater 10, a molten salt steam generator 11, a water pump 12 and a deaerator 13. The output end of the low-temperature molten salt tank 3 is connected with the input ends of a sensible steam heat exchanger 5 and a latent steam heat exchanger 6 through a low-temperature molten salt pump 4, and the output ends of the sensible steam heat exchanger 5 and the latent steam heat exchanger 6 are connected with the input end of the high-temperature molten salt tank 1; the output end of the boiler reheater 7 is connected with the input ends of the sensible heat steam exchanger 5 and the latent heat steam exchanger 6, and the output ends of the sensible heat steam exchanger 5 and the latent heat steam exchanger 6 are connected with the input end of the deaerator 13; the output end of the high-temperature molten salt tank 1 is connected with the input ends of a molten salt steam superheater 10 and a molten salt steam generator 11 through a high-temperature molten salt pump 2, and the output ends of the molten salt steam superheater 10 and the molten salt steam generator 11 are connected with the input end of a low-temperature molten salt tank 3; the output end of the deaerator 13 is connected with the input ends of the molten salt steam superheater 10 and the molten salt steam generator 11 through the water pump 13, and the output ends of the molten salt steam superheater 10 and the molten salt steam generator 11 are connected with the input end of the boiler reheater 7 together with the steam turbine high-pressure cylinder 8; the output end of the boiler reheater 7 is connected with a turbine intermediate pressure cylinder 9.
The thermal storage and heat release process flow of the thermal power generating unit power generation peak regulation system based on steam total heat heating molten salt heat storage is as follows:
(1) the heat storage reduces the power generation load:
when the thermal power generating unit is required to reduce the power generation load, part of reheating hot section steam (boiler reheater outlet steam) does not enter the steam turbine intermediate pressure cylinder 9 to do work for power generation, but the reheating hot section steam is stored in the molten salt, the steam inlet quantity of the steam turbine intermediate pressure cylinder 9 is reduced, and under the working condition of the minimum stable combustion load of the existing boiler, the safety load rate of the minimum unit is reduced, and the unit economy under the low-load working condition is improved.
The specific process comprises the following steps: the low-temperature fused salt carries out reverse heat exchange at steam sensible heat exchanger 5 and steam latent heat exchanger 6 and the reheat heat section steam that produces from boiler reheater 7, and the low-temperature fused salt is carried to steam latent heat exchanger 6 and steam sensible heat exchanger 5 through low-temperature fused salt pump 4, and the sensible heat, the latent heat of reheat heat section steam are stored respectively in steam sensible heat exchanger 5, steam latent heat exchanger 6, and the fused salt after the heating is stored in high-temperature fused salt jar 1.
(2) Heat release increases the power generation load:
when the thermal power generating unit is required to raise the power generation load, one path of saturated deoxygenated water is led out from the water outlet of the deoxygenator 13 and is conveyed to the molten salt steam generator 11 and the molten salt steam superheater 10 through the water pump 12 to generate steam with the same parameters as the steam discharged by the high-pressure cylinder of the steam turbine, the steam and the steam discharged by the high-pressure cylinder of the steam turbine enter the boiler reheater 7 to be continuously heated, and then enter the intermediate-pressure cylinder 9 of the steam turbine to continuously work, so that the purpose of converting the heat stored.
The specific process comprises the following steps: high temperature fused salt is carried to fused salt steam over heater 10 and fused salt steam generator 11 from high temperature fused salt jar 1 through high temperature fused salt pump 2, the oxygen-eliminating device 13 export is carried saturated deoxidization water to fused salt steam generator 11 and fused salt steam over heater 10 through water pump 12, produce the steam with steam turbine high pressure jar steam extraction with the parameter behind the high temperature fused salt heating saturated deoxidization water, enter into boiler reheater 7 with steam turbine high pressure jar steam extraction in the lump and continue to heat, steam after the heating gets into steam turbine intermediate pressure jar 9 and continues to do work and generate electricity.
The utility model discloses a boiler re-heater export steam heating fused salt heat accumulation of thermal power generating unit, the fused salt is exothermic and is the superheated steam to the water vaporation of oxygen-eliminating device 13 export or import, and the superheated steam parameter that the fused salt was exothermic and is produced matches with steam turbine high pressure cylinder steam extraction, enters into boiler re-heater 7 heating in the lump with steam turbine high pressure cylinder steam extraction, gets into 9 powers of doing work electricity generation of steam turbine intermediate pressure cylinder in the lump after the heating, realizes steam fused salt heat accumulation peak regulation electricity generation.
The low-temperature molten salt and the high-temperature steam reversely exchange heat in the steam sensible heat exchanger 5 and the steam latent heat exchanger 6, the high-temperature steam is subjected to phase change, the steam is condensed into hydrophobic water, and the hydrophobic water is decompressed and returned to the deaerator 13.
The high-temperature molten salt and the saturated deoxygenated water perform reverse heat exchange in the molten salt steam superheater 10 and the molten salt steam generator 11, and the saturated deoxygenated water undergoes phase change. Saturated deaerated water comes from deaerator 13, through water pump 12 with saturated deaerated water pressure boost, pressure is decided by steam turbine high pressure cylinder exhaust pressure, and be a little higher than steam turbine high pressure cylinder exhaust pressure, saturated deaerated water after the pressure boost passes through high temperature fused salt heating vaporization, produces the steam equivalent with steam turbine high pressure cylinder exhaust, and with steam turbine high pressure cylinder exhaust enter into boiler reheater 7 in the lump and heat, get into steam turbine intermediate pressure jar 9 in the lump after the heating and do the power generation, realize steam fused salt heat storage peak regulation electricity generation.
Example (b):
taking a 330MW subcritical thermal power generating unit as an example, the generating power is 330MW under the rated power generating working condition, the exhaust pressure of a high-pressure cylinder is 4.15MPa, the temperature is 326 ℃, and the exhaust flow of the high-pressure cylinder is 908 t/h. The steam pressure of a reheating hot section generated by a boiler reheater is 3.70MPa, the temperature is 540 ℃, a thermal power generating unit power generation peak shaving system with the capacity of 22MWh and based on steam total heat heating molten salt heat storage is designed, the steam production of the system is 20t/h, the continuous steam production time is 5h, and the produced steam is merged into high-pressure cylinder exhaust steam to be transmitted to a steam turbine thermal system for power generation.
The heat exchange area of the steam sensible heat exchanger is 28 square meters, the heat exchange area of the steam latent heat exchanger is 1200 square meters, the molten salt steam generator is 410 square meters, the molten salt steam superheater is 145 square meters, the low-temperature and high-temperature molten salt pump design flow rate is 420t/h, the water pump design flow rate is 20t/h, the design lift is 310m, the low-temperature and high-temperature molten salt tank radius is 6m, the height is 12m, the molten salt is 2200t, the floor area of the whole system is 300 square meters, and the total engineering investment is about 2100 million.
A heat storage process: 130 ℃ low-temperature molten salt is conveyed to the steam sensible heat exchanger 5 and the steam latent heat exchanger 6 from the low-temperature molten salt tank 3 through the low-temperature molten salt pump 4 at a flow rate of 420 tons per hour, 540 ℃ high-pressure steam is led to the steam sensible heat exchanger 5 and the steam latent heat exchanger 6 from an outlet of the boiler reheater 7 at a flow rate of 20 tons per hour, the molten salt is heated to 400 ℃ and stored in the high-temperature molten salt tank 1, and high-temperature steam is drained and conveyed to the deaerator 13 at 185 ℃ formed by the steam latent heat exchanger 6.
Heat release flow: 400 ℃ high temperature fused salt is carried to fused salt steam over heater 10 and fused salt steam generator 11 from high temperature fused salt jar 1 with the flow of 420 tons per hour through high temperature fused salt pump 2, 20t/h saturated deoxidization water is drawn forth from oxygen-eliminating device 13 delivery port and is carried to fused salt steam generator 11 and fused salt steam over heater 10 through water pump 12 and produce 4.15MPa, 326 ℃ of steam, enter into boiler reheater 7 with steam turbine high pressure cylinder exhaust together and continue to heat, enter into steam turbine intermediate pressure cylinder 9 in the lump again and continue to do work, the realization turns into 4.4MW electric power with fused salt heat accumulation, 22MWh electric quantity.
The system is charged and discharged twice every day according to the calculation of 350 yuan for the MWh electric power per peak regulation, 7700 yuan of peak regulation reward can be obtained every time, 15400 yuan of peak regulation reward can be obtained every day, the system is calculated according to 250 days every year, 1100 million kWh of renewable electric power can be consumed each year, 385 million yuan of income can be obtained each year, the whole investment can be recovered in 5.5 years, and the economic and social benefits are obvious.
Claims (2)
1. The thermal power generating unit power generation peak regulation system based on steam total heat heating molten salt heat storage is characterized by comprising a high-temperature molten salt tank (1), a high-temperature molten salt pump (2), a low-temperature molten salt tank (3), a low-temperature molten salt pump (4), a steam sensible heat exchanger (5), a steam latent heat exchanger (6), a boiler reheater (7), a steam turbine high-pressure cylinder (8), a steam turbine intermediate-pressure cylinder (9), a molten salt steam superheater (10), a molten salt steam generator (11), a water pump (12) and a deaerator (13); the output end of the low-temperature molten salt tank (3) is connected with the input ends of the sensible heat steam exchanger (5) and the latent heat steam exchanger (6) through a low-temperature molten salt pump (4), and the output ends of the sensible heat steam exchanger (5) and the latent heat steam exchanger (6) are connected with the input end of the high-temperature molten salt tank (1); the output end of the boiler reheater (7) is connected with the input ends of the sensible heat steam exchanger (5) and the latent heat steam exchanger (6), and the output ends of the sensible heat steam exchanger (5) and the latent heat steam exchanger (6) are connected with the input end of the deaerator (13); the output end of the high-temperature molten salt tank (1) is connected with the input ends of the molten salt steam superheater (10) and the molten salt steam generator (11) through the high-temperature molten salt pump (2), and the output ends of the molten salt steam superheater (10) and the molten salt steam generator (11) are connected with the input end of the low-temperature molten salt tank (3); the output end of the deaerator (13) is connected with the input ends of the molten salt steam superheater (10) and the molten salt steam generator (11) through a water pump (12), and the output ends of the molten salt steam superheater (10) and the molten salt steam generator (11) are connected with the input end of the boiler reheater (7) together with the high-pressure turbine cylinder (8); the output end of the boiler reheater (7) is connected with a turbine intermediate pressure cylinder (9).
2. The thermal power generating unit power generation peak regulating system based on steam total-heat heating molten salt heat storage according to claim 1, characterized in that the high-temperature molten salt tank (1) outputs high-temperature molten salt, the low-temperature molten salt tank (3) outputs low-temperature molten salt, the boiler reheater (7) outputs steam at an outlet of the boiler reheater, namely reheated hot section steam, the turbine high-pressure cylinder (8) outputs turbine high-pressure cylinder exhaust steam, and the deaerator (13) outputs saturated deaerated water.
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| CN116241856A (en) * | 2023-04-04 | 2023-06-09 | 华北电力大学 | Molten salt heat storage instant steam production system |
| CN116718059A (en) * | 2023-08-07 | 2023-09-08 | 山西中能天胜科技有限公司 | Power station peak shaving system and method based on high-capacity high-temperature molten salt energy storage |
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| CN110207092A (en) * | 2019-05-16 | 2019-09-06 | 浙江浙能技术研究院有限公司 | A kind of fired power generating unit power generation peak adjusting system and method based on the full heat heating fused salt accumulation of heat of steam |
| CN110207092B (en) * | 2019-05-16 | 2024-06-11 | 浙江浙能技术研究院有限公司 | Thermal power generating unit power generation peak regulation system and method based on steam total heat heating fused salt heat accumulation |
| CN114857559A (en) * | 2021-02-05 | 2022-08-05 | 赫普能源环境科技股份有限公司 | Energy storage boiler and power generation system based on energy storage boiler |
| CN116241856A (en) * | 2023-04-04 | 2023-06-09 | 华北电力大学 | Molten salt heat storage instant steam production system |
| CN116718059A (en) * | 2023-08-07 | 2023-09-08 | 山西中能天胜科技有限公司 | Power station peak shaving system and method based on high-capacity high-temperature molten salt energy storage |
| CN116718059B (en) * | 2023-08-07 | 2023-10-27 | 山西中能天胜科技有限公司 | Power station peak shaving system and method based on high-capacity high-temperature molten salt energy storage |
| CN117366545A (en) * | 2023-11-21 | 2024-01-09 | 北京中巨建润新能源科技有限公司 | Energy storage method and system based on gas self-contained power plant |
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