CN214616693U - Flexible energy supply system of thermal power generating unit based on steam energy storage - Google Patents
Flexible energy supply system of thermal power generating unit based on steam energy storage Download PDFInfo
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- CN214616693U CN214616693U CN202121087520.2U CN202121087520U CN214616693U CN 214616693 U CN214616693 U CN 214616693U CN 202121087520 U CN202121087520 U CN 202121087520U CN 214616693 U CN214616693 U CN 214616693U
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Abstract
The utility model relates to a flexible energy supply system of a thermal power generating unit based on steam energy storage, which belongs to the technical field of steam energy storage and comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a steam heat accumulator and a steam ejector; the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder are sequentially connected in series, and the steam heat accumulator is connected with the intermediate-pressure cylinder in parallel; the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the steam heat accumulator are all connected with the steam ejector; a first electric valve is arranged between the high-pressure steam inlet pipe and the steam ejector, and a second electric valve is arranged between the high-pressure cylinder and the steam ejector; and a fourth electric valve is arranged on a heat storage branch between the intermediate pressure cylinder and the steam heat accumulator, and a fifth electric valve is arranged on a heat storage branch between the steam heat accumulator and the low pressure cylinder. The utility model discloses a set peak shaving degree of depth nature and rapidity are reinforceed in the initiative regulation and control of steam heat accumulator and steam ejector, can effectively improve thermoelectricity flexibility, promote the scale of new forms of energy electric power such as wind-powered electricity generation, photovoltaic to disappear.
Description
Technical Field
The utility model belongs to the technical field of steam energy storage, in particular to flexible energy supply system of thermal power generating unit based on steam energy storage.
Background
The large-scale grid connection of the intermittent new energy forces a basic power supply which mainly uses thermal power generation to participate in comprehensive peak regulation. The insufficient load following capability of the thermal power generation is an important factor for inducing a large amount of wind and light abandonment in the three north area. Aiming at the contradiction between the high elasticity requirement required by new energy power consumption of wind power, photovoltaic and the like and the serious deficiency of peak regulation capability of thermal power generation, a novel thermal power generating unit energy supply system is required to further improve the thermal power operation flexibility, promote the large-scale consumption of the new energy power and assist the realization of the double-carbon strategic target in China.
Disclosure of Invention
The utility model discloses a solve the technical problem that exists among the known art and provide a nimble energy supply system of thermal power generating unit based on steam heat accumulator, the initiative regulation and control through steam heat accumulator and steam ejector strengthens unit peak shaving degree of depth nature and rapidity, can effectively improve the thermoelectricity flexibility, promotes the scale of new forms of energy electric power such as wind-powered electricity generation, photovoltaic to be absorbed.
The utility model comprises the following technical scheme: a flexible energy supply system of a thermal power generating unit based on steam energy storage comprises a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a steam heat accumulator and a steam ejector; the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder are sequentially connected in series, and the steam heat accumulator is connected with the intermediate-pressure cylinder in parallel; the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the steam heat accumulator are all connected with the steam ejector; a first electric valve is arranged between the high-pressure steam inlet pipe and the steam ejector, and a second electric valve is arranged between the high-pressure cylinder and the steam ejector; and a fourth electric valve is arranged on a heat storage branch between the intermediate pressure cylinder and the steam heat accumulator, and a fifth electric valve is arranged on a heat storage branch between the steam heat accumulator and the low pressure cylinder.
Further, a third electric valve is arranged on a connecting pipeline between the steam heat accumulator and the steam ejector. The main function of the steam heat accumulator is to make the water storage circulate as necessary to eliminate the temperature stratification phenomenon.
Furthermore, the steam heat accumulator is a horizontal steam heat accumulator, the outer wall of the steam heat accumulator is coated with a heat insulation layer, and a heat charging steam main pipe and a branch pipe are arranged inside the steam heat accumulator.
Furthermore, the tail end of the branch pipe is provided with a steam nozzle with an upward nozzle; and a circulating guide cylinder is arranged at the periphery of the steam nozzle.
Furthermore, a horizontal steam-water separator is arranged at a steam outlet at the top outside the cylinder body of the steam heat accumulator and used for preventing serious water carrying of steam during grid connection.
Furthermore, an air release valve is arranged at the top of the steam-water separator, and an exhaust check valve is arranged between the steam-water separator and the exhaust pipe.
Furthermore, a water inlet valve and a check valve are arranged on a water inlet of the steam heat accumulator, and detection instruments such as a liquid level meter and a pressure meter are also arranged on the steam heat accumulator.
Further, an air inlet check valve is arranged between the steam heat accumulator and the steam supply pipe, a water outlet and a support are arranged at the bottom of the cylinder wall of the steam heat accumulator, and a drain valve is arranged on the water outlet.
The working process is as follows:
when the new energy power step increases, the thermal power generating unit needs to reduce the output rapidly. The superheated steam of the middle stage of the intermediate pressure cylinder is sent into the steam heat accumulator through the fourth electric valve for heat charging, and the temperature of unsaturated water in the steam heat accumulator is increased; along with the continuous introduction of the superheated steam into the steam heat accumulator, unsaturated water is mixed and heated to a saturated state, the superheated steam is continuously introduced, and the pressure in the steam heat accumulator is gradually increased;
when the new energy power step property is reduced, the thermal power generating unit needs to rapidly increase the output. Saturated liquid in the steam heat accumulator is decompressed and then flashed into steam, the steam is sent out through a fifth electric valve to release heat, and the output steam and the steam from the intermediate pressure cylinder are converged and then sent to the low pressure cylinder;
when the system is used for heat supply, the first electric valve or the second electric valve can be automatically selected to be opened according to specific heat supply requirements and variable working condition parameters of the steam turbine, and high-pressure steam is used for injecting flash steam in the steam heat accumulator through the steam ejector to supply heat, so that thermoelectric decoupling is realized, and the peak regulation capacity of the heat supply unit is indirectly improved.
The utility model has the advantages and positive effect:
1. the utility model discloses a set peak shaving degree of depth nature and rapidity are reinforceed in the initiative regulation and control of steam heat accumulator and steam ejector, can effectively improve thermoelectricity flexibility, promote the scale of new forms of energy electric power such as wind-powered electricity generation, photovoltaic to disappear.
2. The utility model discloses can effectively alleviate the contradiction between the high elasticity demand that new forms of energy scale were absorbed and the limited peak regulation ability of thermal power generating unit, realize energy saving and emission reduction, the realization of china's carbon peak reaching and carbon neutralization strategy target of helping hand.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the structure of the steam heat accumulator.
In the figure, 1-steam heat accumulator; 2-circulating guide shell; 3-a steam nozzle; 4-a drain valve; 5-inlet valve and check valve; 6-a liquid level meter; 7-a pressure gauge; 8-an inlet check valve; 9-exhaust check valve; 10-an air release valve; 11-a steam-water separator; 12-a steam supply pipe; 13-a steam exhaust pipe; 14-a high pressure cylinder; 15-intermediate pressure cylinder; 16-low pressure cylinder; 18-a steam ejector; 19-a first electrically operated valve; 20-a second electrically operated valve; 21-third electrically operated valve; 22-fourth electrically operated valve; 23-fifth electro valve.
Detailed Description
To further disclose the contents, features and functions of the present invention, the following examples are given in detail with reference to the accompanying drawings.
Example (b): referring to fig. 1-2, a flexible energy supply system for a thermal power generating unit based on steam energy storage comprises a high-pressure cylinder 14, an intermediate-pressure cylinder 15, a low-pressure cylinder 16, a steam heat accumulator 1 and a steam ejector 18; the high-pressure cylinder 14, the intermediate-pressure cylinder 15 and the low-pressure cylinder 16 are sequentially connected in series, and the steam heat accumulator 1 is connected with the intermediate-pressure cylinder 15 in parallel; the high-pressure cylinder 14, the intermediate-pressure cylinder 15, the low-pressure cylinder 16 and the steam heat accumulator 1 are all connected with a steam injector 18; a first electric valve 19 is arranged between the high-pressure steam inlet pipe and the steam ejector 18, and a second electric valve 20 is arranged between the high-pressure cylinder 14 and the steam ejector 18; a fourth electric valve 22 is arranged on a heat storage branch between the intermediate pressure cylinder 15 and the steam heat accumulator 1, and a fifth electric valve 23 is arranged on a heat storage branch between the steam heat accumulator 1 and the low pressure cylinder 16. A third electric valve 21 is arranged on a connecting pipeline between the steam heat accumulator 1 and the steam ejector 18. The main function of the steam heat accumulator 1 is to circulate the water storage as necessary to eliminate the temperature stratification phenomenon.
The steam heat accumulator 1 is a horizontal steam heat accumulator, the outer wall of the steam heat accumulator 1 is coated with a heat insulation layer, and a heat charging steam main pipe and a branch pipe are arranged inside the steam heat accumulator. The tail end of the branch pipe is provided with a steam nozzle 3 with an upward spout; and a circulating guide cylinder 2 is arranged on the periphery of the steam nozzle 3.
And a horizontal steam-water separator 11 is arranged at a steam outlet at the top outside the cylinder body of the steam heat accumulator 1 and is used for preventing serious water carrying of steam during grid connection. An air release valve 10 is arranged at the top of the steam-water separator 11, and an exhaust check valve 9 is arranged between the steam-water separator 11 and an exhaust pipe 13. A water inlet valve and a check valve 5 are arranged on a water inlet of the steam heat accumulator 1, and detection instruments such as a liquid level meter 6 and a pressure gauge 7 are also arranged on the steam heat accumulator 1. An air inlet check valve 8 is arranged between the steam heat accumulator 1 and the steam supply pipe 12, a water outlet and a support are arranged at the bottom of the cylindrical wall of the steam heat accumulator 1, and a water discharge valve 4 is arranged on the water outlet.
The working principle is as follows:
1) wind power, photovoltaic and other new energy electric power have strong random fluctuation, and when new energy electric power output step increases, the thermal power unit needs to reduce power rapidly to maintain the overall power output stability of the system, so that the mass flow of steam in the steam turbine needs to be reduced urgently. Therefore, the fourth motor-operated valve 22 is opened to extract the steam of the intermediate turbine cylinder 15 and eject the steam to the steam nozzle 3 located under the water surface via the steam supply pipe 12. The steam and the water generate heat and mass exchange, firstly, a steam-water mixture with light weight is formed in the upper area of the upper part of the steam nozzle 3 in the circulating guide cylinder 2, and the kinetic energy of the sprayed steam is utilized to push the water in the circulating guide cylinder 2 to flow upwards and diffuse in the water. At the moment, water around the lower opening of the circulating guide cylinder 2 flows into the cylinder and flows upwards, the water is mixed with steam sprayed by the steam nozzle 3 and then flows out of the cylinder opening upwards, and the heated water flows downwards at the periphery of the circulating guide cylinder 2 and is circulated repeatedly. Along with the continuous introduction of high-temperature high-pressure steam, the originally stored water is gradually heated and heated, meanwhile, most of the steam is condensed into water, and the pressure, the water temperature and the water level in the container are gradually increased until the enthalpy value of the water is increased to the enthalpy value of saturated water corresponding to the pressure in the container.
2) When the power output of the new energy power decreases step by step, the thermal power generating unit needs to rapidly increase the power output of the unit to make up for the insufficient output of the new energy power, so that the steam mass flow of the steam turbine needs to be increased urgently. At this time, the fifth electric valve 23 is opened, the pressure in the steam accumulator 1 is higher than the outlet pressure of the steam exhaust pipe 13, and the steam in the steam space flows to the low pressure cylinder 16 by flushing the exhaust check valve 9 through the steam-water separator 11. The pressure in the container begins to drop, and the saturated water becomes superheated water and evaporates rapidly, producing saturated steam continuously.
3) When the thermal power generating unit is a heat supply unit, the steps are the same as the steps 1) and 2), steam can be rapidly stored or provided through the steam heat accumulator 1, so that the purpose of rapidly reducing or improving the power of the unit is achieved, and the peak regulation rate of the unit is accelerated.
4) When this thermal power unit is the heat supply unit, the heating load of heat supply unit is comparatively stable usually. Because the heat supply unit operates in a mode of 'fixing power with heat', the deep peak regulation capacity of the unit is severely limited. The high-pressure steam is used for ejecting the flash steam in the steam heat accumulator 1 through the steam ejector 18, so that the heat supply steam extraction amount of the heat supply unit can be reduced, and the peak regulation capacity of the heat supply unit is improved. The specific process is as follows: according to the heat supply requirement and the variable working condition parameters of the steam turbine, the first electric valve 19 or the second electric valve 20 is automatically selected to be opened, the third electric valve 21 is opened at the same time, the pressure in the steam heat accumulator 1 is higher than the pressure at the outlet of the steam exhaust pipe 13, steam in the steam space is flushed through the steam-water separator 11 by the exhaust check valve 9, flows to the steam ejector 18 to be injected into the inlet, and is injected by high-pressure steam to supply heat jointly. The pressure in the container begins to drop, and the saturated water becomes superheated water and evaporates rapidly, producing saturated steam continuously.
5) When the water level of the steam heat accumulator 1 is increased or decreased after continuous operation, soft water is periodically discharged by a drain valve 4 or supplemented by a feed valve 5 in order to maintain the set water storage amount to maintain normal heat charging and heat releasing.
Although the preferred embodiments of the present invention have been described, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention. All of which fall within the scope of the present invention.
Claims (8)
1. The utility model provides a nimble energy supply system of thermal power generating unit based on steam holds energy, includes high pressure cylinder, intermediate pressure cylinder, low pressure jar, steam heat accumulator and steam ejector, its characterized in that: the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder are sequentially connected in series, and the steam heat accumulator is connected with the intermediate-pressure cylinder in parallel; the high-pressure cylinder, the medium-pressure cylinder, the low-pressure cylinder and the steam heat accumulator are all connected with the steam ejector; a first electric valve is arranged between the high-pressure steam inlet pipe and the steam ejector, and a second electric valve is arranged between the high-pressure cylinder and the steam ejector; and a fourth electric valve is arranged on a heat storage branch between the intermediate pressure cylinder and the steam heat accumulator, and a fifth electric valve is arranged on a heat storage branch between the steam heat accumulator and the low pressure cylinder.
2. The steam-storage-energy-based thermal power generating unit flexible energy supply system according to claim 1, characterized in that: and a third electric valve is arranged on a connecting pipeline between the steam heat accumulator and the steam ejector.
3. The steam-storage-energy-based thermal power generating unit flexible energy supply system according to claim 1, characterized in that: the steam heat accumulator is a horizontal steam heat accumulator, the outer wall of the steam heat accumulator is coated with a heat insulation layer, and a heat-charging steam main pipe and a branch pipe are arranged in the steam heat accumulator.
4. The steam-storage-energy-based thermal power generating unit flexible energy supply system according to claim 3, characterized in that: the tail end of the branch pipe is provided with a steam nozzle with an upward nozzle; and a circulating guide cylinder is arranged at the periphery of the steam nozzle.
5. The steam-storage-energy-based thermal power generating unit flexible energy supply system according to claim 1, characterized in that: and a horizontal steam-water separator is arranged at a steam outlet at the top outside the cylinder body of the steam heat accumulator.
6. The steam energy storage based thermal power generating unit flexible energy supply system according to claim 5, characterized in that: and an air release valve is arranged at the top of the steam-water separator, and an exhaust check valve is arranged between the steam-water separator and the exhaust pipe.
7. The steam-storage-energy-based thermal power generating unit flexible energy supply system according to claim 1, characterized in that: and a water inlet valve and a check valve are arranged on a water inlet of the steam heat accumulator, and a liquid level meter and a pressure gauge are also arranged on the steam heat accumulator.
8. The steam-storage-energy-based thermal power generating unit flexible energy supply system according to claim 1, characterized in that: an air inlet check valve is arranged between the steam heat accumulator and the steam supply pipe, a water outlet and a support are arranged at the bottom of the cylinder wall of the steam heat accumulator, and a drain valve is arranged on the water outlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121087520.2U CN214616693U (en) | 2021-05-20 | 2021-05-20 | Flexible energy supply system of thermal power generating unit based on steam energy storage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121087520.2U CN214616693U (en) | 2021-05-20 | 2021-05-20 | Flexible energy supply system of thermal power generating unit based on steam energy storage |
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| CN214616693U true CN214616693U (en) | 2021-11-05 |
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| CN202121087520.2U Active CN214616693U (en) | 2021-05-20 | 2021-05-20 | Flexible energy supply system of thermal power generating unit based on steam energy storage |
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2021
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