Adjustable expansion tank for peak shaving thermal power plant

Abstract

The invention relates to the technical field of peak-shaving thermal power plant pressure stabilizing equipment, and discloses an adjustable expansion water tank for a peak-shaving thermal power plant, which comprises a water tank body, the water tank body is communicated with a closed cold water system through a water inlet pipe, and the bottom of the water tank body is provided with a drain pipe; water in the closed cold water system enters the water tank body from the water inlet pipe and is discharged outwards from the water discharging pipe so that balance water with the rated liquid level can be formed in the water tank body, a water supplementing pipe is arranged on one side of the water tank body, and an external water supplementing pump is connected to the water supplementing pipe. The water tank body is further provided with a pressure intensity adjusting assembly used for changing the pressure intensity in the water tank body and a monitoring assembly used for monitoring the balance water liquid level in real time. The monitoring assembly is electrically connected with an external make-up pump and the pressure intensity adjusting assembly. The system has the advantages that the system pressure is effectively adjusted, sudden change of the system pressure is slowed down, and the system works stably.

Description

Technical Field

[0001] The invention relates to an adjustable expansion water tank for a peak-shaving thermal power plant, belonging to the technical field of voltage stabilizing equipment for a peak-shaving thermal power plant. Background Art

[0002] Peaking thermal power plants are those designed to provide additional power during peak electricity demand periods and reduce or stop operation during periods of lower electricity demand. The main purpose of such power plants is to balance the supply and demand of the power system, ensuring sufficient power supply during peak demand periods while reducing unnecessary power production during periods of low demand, thereby optimizing energy efficiency and reducing operating costs.

[0003] Due to the characteristics of peak-shaving thermal power plants, the amount of heat source cooled by the closed cooling water system in the thermal power plant will often change, which will cause the temperature of the closed cooling water system to change. The characteristics of water are that when the temperature rises, the volume will expand and bubbles will be generated. If the volume of the pipeline remains fixed, the water pressure in the pipeline will increase. Thermal power plants often have many water systems with different pressures and temperatures. If the pipeline pressure fluctuates, this will directly affect the safety of the equipment and lead to greater safety risks in the production process.

[0004] In the prior art, the common solution is to set a water tank on the closed cold water system, connect its pipe to the inlet of the closed cold water system pump, and fill a certain volume of water in the water tank. When the water pressure in the closed cold water system changes, if the demand increases, the water in the water tank can be added to the closed cold water system to maintain the pressure of the closed cold water system. If the demand decreases, the excess water in the closed cold water system can be stored in the water tank to avoid excessive system pressure to stabilize the pressure. However, there are the following problems when using it: the water tank is limited by its own volume, and its function of regulating pressure is not obvious when the pressure of the closed cold water system changes, and it is difficult to replenish water and increase pressure in time when there is a leak in the system causing the pressure to drop. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an adjustable expansion water tank for a peak-shaving thermal power plant.

[0006] The technical solution of the present invention is as follows: In the first aspect, the present invention provides an adjustable expansion water tank for a peak-shaving thermal power plant, comprising a water tank body, wherein the water tank body is connected to a closed cold water system by means of an inlet pipe, a drain pipe is provided at the bottom of the water tank body, water in the closed cold water system enters the water tank body from the inlet pipe and is discharged outwardly from the drain pipe to form balance water with a rated liquid level in the water tank body, a water supply pipe is provided on one side of the water tank body, an external water supply pump is connected to the water supply pipe, a pressure adjustment component for changing the pressure in the water tank body and a monitoring component for real-time monitoring of the balance water level are also provided on the water tank body, and the monitoring component is electrically connected to the external water supply pump and the pressure adjustment component, respectively.

[0007] Furthermore, the pressure adjustment component includes a telescopic airbag, which is arranged on the top inner wall of the water tank body, and a gap is left between the bottom wall of the telescopic airbag and the balance water. One end of the supplementary pipe is connected to the telescopic airbag, and the other end of the supplementary pipe passes through the water tank body and is connected to an external supplementary pump.

[0008] Furthermore, the pressure adjustment component includes an air pump, which is arranged on the top outer wall of the water tank body, and the output part of the air pump is arranged to extend into the water tank body.

[0009] Furthermore, the monitoring component includes a water level gauge, the detection part of the water level gauge is vertically extended downward into the balance water, the monitoring display part of the water level gauge is located at the top of the water tank body, and the water level gauge is electrically connected to the external supplementary pump and the external water supply pump respectively.

[0010] Furthermore, the monitoring component includes a monitoring box body and a power supply. The monitoring box body is arranged above the balance water, the power supply is arranged on the top outer wall of the water tank body, and a horizontally arranged insulating rod body is arranged in the monitoring box body. Conductive rods are arranged on both side ends of the insulating rod body. The conductive rods on both sides are connected to the positive and negative poles of the power supply respectively by connecting wires. A plurality of water inlet holes are also opened on the bottom of the monitoring box body, and the power supply is also electrically connected to the air pump.

[0011] Furthermore, the monitoring component includes a first power supply box and a first driving shaft. The first power supply box is arranged on the top outer wall of the water tank body. One end of the first driving shaft is rotatably connected to the bottom of the first power supply box, and the other end is arranged to extend into the water tank body. A first magnetic block is arranged on the end of the first driving shaft connected to the first power supply box. A first electromagnetic coil arranged around the first driving shaft is arranged at the position where the first power supply box is connected to the first driving shaft. The first electromagnetic coil is electrically connected to the air pump. A first driving blade is arranged on the end of the first driving shaft extending into the water tank body. The first driving blade is arranged above the balance water.

[0012] Furthermore, the monitoring component also includes a second power supply box and a second drive shaft. The second power supply box is arranged on the top outer wall of the water tank body. One end of the second drive shaft is rotatably connected to the bottom of the second power supply box, and the other end is arranged to extend into the water tank body. A second magnetic block is arranged on the end portion of the second drive shaft connected to the second power supply box. A second electromagnetic coil arranged around the second drive shaft is arranged at the position where the second power supply box and the second drive shaft are connected. A current detection sensor is arranged on the second electromagnetic coil. The current monitoring sensor is electrically connected to the external water supply pump. A second drive blade is arranged on the end portion of the second drive shaft extending into the water tank body. The second drive blade is arranged below the balance water.

[0013] Furthermore, a maintenance observation hole is also provided on the top of the water tank body.

[0014] In a second aspect, the present invention provides a method for stabilizing a closed cooling water system of a peak-shaving thermal power plant, comprising using an adjustable expansion water tank for a peak-shaving thermal power plant as claimed in claim 1, and further comprising the following steps: Step 1: Connect the water tank body to the closed cold water system through the water inlet pipe; Step 2: Use the pressure adjustment component to adjust the pressure inside the water tank body to match the pressure of the pipeline in the closed cold water system; Step 3: Set the action threshold of the monitoring component, and then electrically connect the monitoring component to the pressure adjustment component and the external water supply pump respectively to realize the linkage control of the monitoring component to the pressure adjustment component and the external water supply pump.

[0015] Furthermore, the first step also includes the following steps: calculating the volume of the balance water entering the water tank body, the calculation method is: setting the initial pre-charge pressure in the water tank body, the maximum working pressure of the closed cold water system and the minimum working pressure of the closed cold water system, and then calculating the balance water volume according to the following formula:

[0016] In the formula, represents the equilibrium water volume, Indicates the volume of the water tank. Indicates the initial pre-charge pressure in the water tank body. Indicates the maximum working pressure of the closed cold water system. Indicates the minimum working pressure of the closed cold water system.

[0017] The present invention has the following beneficial effects: The present invention arranges a water tank body on the closed cold water system to form balanced water in the water tank body, and also arranges a water supply pipe, a pressure adjustment component and a monitoring component. In actual use, when the pressure of the closed cold water system rises rapidly, a pressure difference will appear between the closed cold water system and the water tank body, and the amount of water entering the water tank body will increase, and the water level will rise accordingly. At this time, after the monitoring component detects that the water level in the water tank body rises to a specific threshold, it controls the pressure adjustment component to start working, so that it adjusts the pressure in the water tank body to an appropriate value, so as to slow down the rise of the liquid level in the water tank body, thereby slowing down the excessively rapid change of the pressure in the closed cold water system. When there is a leak in the closed cold water system, causing the liquid level in the water tank body to drop rapidly, at this time, after the monitoring component detects that the water level in the water tank body drops to a specific threshold, it controls the external water supply pump to start working, and supplies water to the water tank body through the water supply pipe, so as to stabilize the internal pressure of the closed cold water system. Compared with the prior art, the present invention has the advantages of effectively adjusting the system pressure, slowing down sudden changes in the system pressure, and achieving stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 5 It is a schematic diagram of the internal structure of the monitoring box body in the present invention; Figure 6 It is a schematic diagram of the internal structure of the first power supply box in the present invention; Figure 7 It is a schematic diagram of the internal structure of the second power supply box in the present invention.

[0019] The reference numerals in the figure represent: 1. Water tank body; 2. Closed cold water system; 3. Water inlet pipe; 4. Drain pipe; 5. Balance water; 6. Water supply pipe; 7. Pressure adjustment assembly; 8. Monitoring assembly; 9. Telescopic airbag; 10. Supplementary pipe; 11. Air pump; 12. Water level gauge; 13. Monitoring box; 14. Power supply; 15. Insulating rod; 16. Conductive rod; 17. Connecting wires; 18. Water inlet hole; 19. First power supply box; 20. First drive shaft; 21. First magnetic block; 22. First electromagnetic coil; 23. First drive blade; 24. Second power supply box; 25. Second drive shaft; 26. Second magnetic block; 27. Second electromagnetic coil; 28. Current detection sensor; 29. ​​Second drive blade; 30. Inspection observation hole. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Please refer to Figure 1 The present invention provides an adjustable expansion water tank for a peak-shaving thermal power plant, comprising a water tank body 1, the water tank body 1 and a closed cold water system 2 are connected together by setting a water inlet pipe 3, a drain pipe 4 is set at the bottom of the water tank body 1, and the drain pipe 4 is connected to the closed cold water system 2 to realize water reflux, the water in the closed cold water system 2 enters the water tank body 1 from the water inlet pipe 3 and is discharged from the drain pipe 4 to form a balance water 5 with a rated liquid level in the water tank body 1, and a water supply pipe 6 is set on one side of the water tank body 1, and an external water supply pump is connected to the water supply pipe 6, and the external water supply pump can be connected to the external water supply system, so that the water in the external water supply system can be injected into the water tank body 1 through the water supply pipe 6 when needed. The water tank body 1 is also provided with a pressure adjustment component 7 for changing the pressure in the water tank body 1 and a monitoring component 8 for real-time monitoring of the liquid level of the balance water 5, and the monitoring component 8 is electrically connected to the external water supply pump and the pressure adjustment component 7 respectively. The detection component can control the external water supply pump and the pressure adjustment component 7 to perform corresponding work according to its own set threshold value and the balance water 5 liquid level value it monitors, so as to adjust the pressure of the closed cold water system 2 and ensure the smooth operation of the closed cold water system 2.

[0022] A maintenance observation hole 30 is also provided on the top of the water tank body 1 . The maintenance observation hole 30 is provided to facilitate the operator to perform subsequent maintenance work on the internal components of the water tank body 1 .

[0023] The present invention also provides a method for stabilizing the pressure of a closed cooling water system 2 of a peak-shaving thermal power plant, comprising using the above-mentioned adjustable expansion water tank for a peak-shaving thermal power plant, and further comprising the following steps: Step 1: Connect the water tank body 1 to the closed cold water system 2 through the water inlet pipe 3. At the same time, calculate the volume of the balance water 5 entering the water tank body 1. The calculation method is: set the initial pre-charge pressure in the water tank body 1, the maximum working pressure of the closed cold water system 2, and the minimum working pressure of the closed cold water system 2. The initial pre-charge pressure in the water tank body 1, the maximum working pressure of the closed cold water system 2, and the minimum working pressure of the closed cold water system 2 all need to be set according to actual conditions. Then calculate the volume of the balance water 5 according to the following formula:

[0024] In the formula, represents 5 volumes of balanced water, Indicates the volume of the water tank body 1, Indicates the initial pre-charge pressure in the water tank body 1, Indicates the maximum working pressure of closed cold water system 2. Indicates the minimum working pressure of closed cold water system 2.

[0025] Afterwards, the water tank body 1 is filled with a corresponding volume of the balancing water 5 according to the calculated volume of the balancing water 5 .

[0026] Step 2: Use the pressure adjustment component 7 to adjust the pressure in the water tank body 1 to match the pressure in the pipeline of the closed cold water system 2; Step 3: Set the action threshold of the monitoring component 8, and then electrically connect the monitoring component 8 to the pressure adjustment component 7 and the external water supply pump respectively, so as to realize the linkage control of the monitoring component 8 to the pressure adjustment component 7 and the external water supply pump.

[0027] When the pressure of the closed cold water system 2 rises rapidly, at this time, a pressure difference will appear between the closed cold water system 2 and the water tank body 1, then the amount of water entering the water tank body 1 will increase, and the water level of the balancing water 5 will rise accordingly. At this time, after the monitoring component 8 detects that the water level in the water tank body 1 has risen to a specific threshold, it controls the pressure adjustment component 7 to start working, so that it adjusts the pressure in the water tank body 1 to an appropriate value. The specific adjustment value is determined according to the normal working pressure of the closed cold water system 2, so that it can slow down the rise in the liquid level of the balancing water 5 in the water tank body 1, thereby slowing down the excessively rapid change in the pressure of the closed cold water system 2. When there is a leak in the closed cold water system 2, causing the liquid level of the water tank body 1 to drop rapidly, at this time, the pressure of the closed cold water system 2 will drop. After the monitoring component 8 detects that the water level of the balancing water 5 in the water tank body 1 has dropped to a specific threshold, it controls the external water supply pump to start working, and the external water supply pump supplies water to the water tank body 1 through the water supply pipe 6, so as to stabilize the internal pressure of the closed cold water system 2.

[0028] Example 1: Please refer to Figure 2 In this embodiment, the pressure adjustment component 7 includes a telescopic airbag 9, which is arranged on the top inner wall of the water tank body 1, and a gap is left between the bottom wall of the telescopic airbag 9 and the balance water 5. One end of the replenishment pipe 10 is connected to the telescopic airbag 9, and the other end of the replenishment pipe 10 passes through the water tank body 1 and is connected to an external replenishment pump. The telescopic airbag 9 can adjust the pressure in the water tank body 1 by changing its own volume, and the specific degree of adjustment can be determined according to actual conditions.

[0029] In this embodiment, the monitoring component 8 includes a water level gauge 12, the detection part of the water level gauge 12 is arranged to extend vertically downward into the interior of the balancing water 5, the monitoring display part of the water level gauge 12 is arranged at the top of the water tank body 1, and the water level gauge 12 is electrically connected to the external supplementary pump and the external water supply pump respectively.

[0030] Through the above-mentioned settings, according to actual conditions, the corresponding maximum threshold and minimum threshold are set on the water level gauge 12. When the water level gauge 12 monitors that the liquid level of the balancing water 5 in the water tank body 1 rises to the maximum threshold, at this time, the water level gauge 12 controls the external supplementary pump to start working. The external supplementary pump increases the pressure in the water tank body 1 by contracting the telescopic airbag 9, so as to slow down the rising of the liquid level of the balancing water 5 in the water tank body 1. When the water level gauge 12 detects that the liquid level of the balancing water 5 in the water tank body 1 returns to normal, that is, it is between the maximum threshold and the minimum threshold, at this time, the water level gauge 12 controls the external supplementary pump to start working, so that the telescopic airbag 9 returns to its original state. When the water level gauge 12 detects that the liquid level of the balancing water 5 in the water tank body 1 drops to the minimum threshold, the water level gauge 12 controls the external water supply pump to start working, and the external water supply pump supplies water to the water tank body 1 through the water supply pipe 6, so as to stabilize the internal pressure of the closed cold water system 2. When the liquid level of the balancing water 5 in the water tank body 1 returns to normal, the water level gauge 12 controls the external water supply pump to stop working.

[0031] Example 2: Please refer to Figure 3 , Figure 5 and Figure 6 In this embodiment, the pressure adjustment component 7 includes an air pump 11, which is arranged on the top outer wall of the water tank body 1, and the output part of the air pump 11 is arranged to extend into the water tank body 1. The air pump 11 controls the pressure in the water tank body 1 by injecting or extracting gas into the water tank body 1. The specific power and model of the air pump 11 can be selected and determined according to actual conditions.

[0032] In this embodiment, the monitoring assembly 8 includes a monitoring box body 13, a power supply 14, a second power supply box body 24 and a second drive shaft 25. The monitoring box body 13 is arranged above the balance water 5. The position of the monitoring box body 13 is the highest critical value of the balance water 5. When the balance water 5 floods the monitoring box body 13, it means that the closed cold water system 2 is abnormal. The power supply 14 is arranged on the top outer wall of the water tank body 1. A horizontally arranged insulating rod body 15 is arranged in the monitoring box body 13. Conductive rods 16 are arranged on both side ends of the insulating rod body 15. The conductive rods 16 on both sides are connected to the positive and negative poles of the power supply 14 by connecting wires 17. A plurality of water inlet holes 18 are also opened on the bottom of the monitoring box body 13. The power supply 14 is also electrically connected to the air pump 11. The second power supply box 24 is arranged on the top outer wall of the water tank body 1, one end of the second drive shaft 25 is rotatably connected to the bottom of the second power supply box 24, and the other end is arranged to extend into the water tank body 1, and a second magnetic block 26 is arranged on the end portion where the second drive shaft 25 is connected to the second power supply box 24, and a second electromagnetic coil 27 arranged around the second drive shaft 25 is arranged at the position where the second power supply box 24 is connected to the second drive shaft 25, and a current detection sensor 28 is arranged on the second electromagnetic coil 27, and the current monitoring sensor is electrically connected to the external water supply pump, and a second drive blade 29 is arranged on the end portion of the second drive shaft 25 extending into the water tank body 1, and the second drive blade 29 is arranged below the balancing water 5, and the position of the second drive blade 29 is the lowest critical value of the balancing water level 5.

[0033] Through the above arrangement, since the balancing water 5 is circulating, that is, it continuously enters from the water inlet pipe 3 and is discharged from the drain pipe 4, it can push the second driving blade 29 to move. After the second driving blade 29 moves, it can drive the second driving shaft 25 to rotate, so that the second magnetic block 26 continuously cuts the second electromagnetic coil 27, so that the second electromagnetic coil 27 generates current, so that the current detection sensor 28 can continuously detect the current. When the liquid level of the balancing water 5 in the water tank body 1 rises to the highest critical value, at this time, the balancing water 5 will submerge the monitoring box body 13, then the conductive rods 16 on both sides will be turned on under the action of the balancing water 5, so that the conductive rods 16 on both sides form a circuit with the power supply 14 through the connecting wires 17 on both sides, and the power supply 14 is energized. After the power supply 14 is energized, it can control the air pump 11 to start working, so that the air pump 1 1 is used to inflate the water tank body 1 to increase the pressure inside the water tank body 1, thereby playing a role in slowing down the rise of the level of the balancing water 5 inside the water tank body 1. After the level of the balancing water 5 returns to normal, the conductive rods 16 on both sides cannot be turned on. After the power supply 14 is powered off, the air pump 11 can be controlled to perform the air extraction work. The air pump 11 stops working after restoring the pressure inside the water tank body 1 to the initial level. When the level of the balancing water 5 inside the water tank body 1 drops to the lowest critical value, the balancing water 5 cannot push the second driving blade 29 to move, thereby causing the second electromagnetic coil 27 to fail to generate current. When the current detection sensor 28 cannot detect the current, the current sensor can control the external water supply pump to start working, and the external water supply pump replenishes water into the water tank body 1 through the water supply pipe 6, so as to play a role in stabilizing the internal pressure of the closed cold water system 2. After the level of the balancing water 5 returns to normal, the balancing water 5 can push the second driving blade 29 to move again. At this time, the current detection sensor 28 can detect the current again, and the current sensor can control the external water supply pump to stop working.

[0034] At the same time, the monitoring component 8 provided in the present embodiment will work only when it is submerged in the balancing water 5 when monitoring the highest critical value of the balancing water 5, and will not work when it is not submerged, and has the characteristics of low power consumption. At the same time, it can continuously generate current through the movement of the second driving blade 29, the second driving shaft 25, the second magnetic block 26 and the second electromagnetic coil 27. The generated current can be collected by setting a corresponding battery, thereby realizing the rational use of resources.

[0035] Example 3: Please refer to Figure 4 , Figure 6 and Figure 7 In this embodiment, the pressure adjustment component 7 includes an air pump 11, which is arranged on the top outer wall of the water tank body 1, and the output part of the air pump 11 is arranged to extend into the water tank body 1. The air pump 11 controls the pressure in the water tank body 1 by injecting or extracting gas into the water tank body 1. The specific power and model of the air pump 11 can be selected and determined according to actual conditions.

[0036] In this embodiment, the monitoring component 8 includes a first power supply box 19, a first drive shaft 20, a second power supply box 24 and a second drive shaft 25. The first power supply box 19 is arranged on the top outer wall of the water tank body 1. One end of the first drive shaft 20 is rotatably connected to the bottom of the first power supply box 19, and the other end is arranged to extend into the water tank body 1. A first magnetic block 21 is arranged on the end portion where the first drive shaft 20 is connected to the first power supply box 19. A first electromagnetic coil 22 arranged around the first drive shaft 20 is arranged at the position where the first power supply box 19 is connected to the first drive shaft 20. The first electromagnetic coil 22 is electrically connected to the air pump 11. A first drive blade 23 is arranged on the end portion of the first drive shaft 20 extending into the water tank body 1. The first drive blade 23 is arranged above the balancing water 5. The position of the second driving blade 29 is the highest critical value of the balancing water 5 water level. The second power supply box 24 is arranged on the top outer wall of the water tank body 1. One end of the second driving shaft 25 is rotatably connected to the bottom of the second power supply box 24, and the other end is arranged to extend into the water tank body 1. A second magnetic block 26 is arranged on the end portion where the second driving shaft 25 is connected to the second power supply box 24. A second electromagnetic coil 27 arranged around the second driving shaft 25 is arranged at the position where the second power supply box 24 is connected to the second driving shaft 25. A current detection sensor 28 is arranged on the second electromagnetic coil 27. The current monitoring sensor is electrically connected to the external water supply pump. A second driving blade 29 is arranged on the end portion of the second driving shaft 25 extending into the water tank body 1. The second driving blade 29 is arranged below the balancing water 5. The position of the second driving blade 29 is the lowest critical value of the balancing water 5 water level.

[0037] Through the above-mentioned arrangement, since the balancing water 5 is circulating, that is, it continuously enters from the water inlet pipe 3 and is discharged from the drain pipe 4, therefore, when the balancing water 5 submerges the first driving blade 23 and the second driving blade 29, it can push the first driving blade 23 and the second driving blade 29 to move. After the first driving blade 23 moves, it can drive the first driving shaft 20 to rotate, so that the first magnetic block 21 continuously cuts the first electromagnetic coil 22, so that the first electromagnetic coil 22 generates current. After the second driving blade 29 moves, it can drive the second driving shaft 25 to rotate, so that the second magnetic block 26 continuously cuts the second electromagnetic coil 27, so that the second electromagnetic coil 27 generates current, so that the current detection sensor 28 can continuously detect the current. When the liquid level of the balancing water 5 in the water tank body 1 rises to the highest critical value, at this time, the balancing water 5 will submerge the first driving blade 23 to push the first driving blade 23 to move, so that the first electromagnetic coil 22 generates current. After the first electromagnetic coil 22 generates current, it can control the air pump 11 to start working, so that the air pump 11 inflates the water tank body 1 to increase the pressure in the water tank body 1, thereby slowing down the rise of the balancing water 5 liquid level in the water tank body 1. After the balancing water 5 liquid level returns to normal, the balancing water 5 will leave the first driving blade 23 and will not be able to push the first driving blade 23 to move. At this time, the first electromagnetic coil 22 is powered off and cannot generate current. At this time, the first electromagnetic coil 22 can control the air pump 11 to pump air. The air pump 11 stops working after restoring the pressure in the water tank body 1 to the initial level. When the liquid level of the balancing water 5 in the water tank body 1 drops to the lowest critical value, the balancing water 5 cannot push the second drive blade 29 to move, which causes the second electromagnetic coil 27 to be unable to generate current. When the current detection sensor 28 cannot detect the current, the current sensor can control the external water supply pump to start working. The external water supply pump replenishes water into the water tank body 1 through the water supply pipe 6 to stabilize the internal pressure of the closed cold water system 2. After the liquid level of the balancing water 5 returns to normal, the balancing water 5 can push the second drive blade 29 to move again. At this time, the current detection sensor 28 can detect the current again, and the current sensor can control the external water supply pump to stop working.

[0038] At the same time, the monitoring component 8 provided in this embodiment can continuously generate current through the movement of the first drive blade 23, the first drive shaft 20, the first magnetic block 21, the first electromagnetic coil 22, the second drive blade 29, the second drive shaft 25, the second magnetic block 26 and the second electromagnetic coil 27. The generated current can be collected by setting up corresponding batteries, thereby realizing the rational use of resources.

[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An adjustable expansion water tank for a peak load-shaving thermal power plant, characterized in that: The invention comprises a water tank body (1), wherein the water tank body (1) is connected to a closed cold water system (2) by means of a water inlet pipe (3), a drainage pipe (4) is arranged at the bottom of the water tank body (1), water in the closed cold water system (2) enters the water tank body (1) from the water inlet pipe (3) and is discharged from the drainage pipe (4) to form balanced water (5) with a rated liquid level in the water tank body (1), a water supply pipe (6) is arranged on one side of the water tank body (1), an external water supply pump is connected to the water supply pipe (6), and a pressure adjustment component (7) for changing the pressure in the water tank body (1) and a monitoring component (8) for real-time monitoring of the liquid level of the balanced water (5) are also arranged on the water tank body (1), and the monitoring component (8) is electrically connected to the external water supply pump and the pressure adjustment component (7), respectively.

2. The adjustable expansion water tank for peak load regulation thermal power plant according to claim 1, characterized in that: The pressure adjustment assembly (7) comprises a telescopic airbag (9), which is arranged on the top inner wall of the water tank body (1), and a gap is left between the bottom wall of the telescopic airbag (9) and the balance water (5). One end of a replenishing pipe (10) is connected to the telescopic airbag (9), and the other end of the replenishing pipe (10) passes through the water tank body (1) and is connected to an external replenishing pump.

3. The adjustable expansion water tank for peak load regulation thermal power plant according to claim 1, characterized in that: The pressure adjustment component (7) comprises an air pump (11), which is arranged on the top outer wall of the water tank body (1), and the output part of the air pump (11) is arranged to extend into the water tank body (1).

4. The adjustable expansion water tank for peak load regulation thermal power plant according to claim 2, characterized in that: The monitoring assembly (8) comprises a water level gauge (12), wherein a detection portion of the water level gauge (12) is arranged to extend vertically downward into the interior of the balance water (5), a monitoring display portion of the water level gauge (12) is arranged to be located at the top of the water tank body (1), and the water level gauge (12) is electrically connected to an external supplementary pump and an external water supply pump, respectively.

5. The adjustable expansion water tank for peak load regulation thermal power plant according to claim 3, characterized in that: The monitoring assembly (8) comprises a monitoring box body (13) and a power supply (14). The monitoring box body (13) is arranged above the balancing water (5). The power supply (14) is arranged on the top outer wall of the water tank body (1). An insulating rod body (15) arranged horizontally is arranged in the monitoring box body (13). Conductive rods (16) are arranged on both side ends of the insulating rod body (15). The conductive rods (16) on both sides are connected to the positive electrode and the negative electrode of the power supply (14) respectively by connecting wires (17). A plurality of water inlet holes (18) are also opened on the bottom of the monitoring box body (13). The power supply (14) is also electrically connected to the air pump (11).

6. The adjustable expansion water tank for peak load regulation thermal power plant according to claim 3, characterized in that: The monitoring assembly (8) comprises a first power supply box (19) and a first drive shaft (20). The first power supply box (19) is arranged on the top outer wall of the water tank body (1). One end of the first drive shaft (20) is rotatably connected to the bottom of the first power supply box (19), and the other end is arranged to extend into the water tank body (1). A first magnetic block (21) is arranged on the end of the first drive shaft (20) connected to the first power supply box (19). A first electromagnetic coil (22) arranged around the first drive shaft (20) is arranged at the position where the first power supply box (19) and the first drive shaft (20) are connected. The first electromagnetic coil (22) is electrically connected to the air pump (11). A first drive blade (23) is arranged on the end of the first drive shaft (20) extending into the water tank body (1). The first drive blade (23) is arranged above the balance water (5).

7. An adjustable expansion water tank for peak load regulation thermal power plant according to claim 5 or 6, characterized in that: The monitoring assembly (8) further comprises a second power supply box (24) and a second drive shaft (25). The second power supply box (24) is arranged on the top outer wall of the water tank body (1). One end of the second drive shaft (25) is rotatably connected to the bottom of the second power supply box (24), and the other end is arranged to extend into the water tank body (1). A second magnetic block (26) is arranged on the end of the second drive shaft (25) connected to the second power supply box (24). A second electromagnetic coil (27) arranged around the second drive shaft (25) is arranged at the position where the second power supply box (24) and the second drive shaft (25) are connected. A current detection sensor (28) is arranged on the second electromagnetic coil (27). The current monitoring sensor is electrically connected to an external water supply pump. A second drive blade (29) is arranged on the end of the second drive shaft (25) extending into the water tank body (1). The second drive blade (29) is arranged below the balance water (5).

8. The adjustable expansion water tank for peak load regulation thermal power plant according to claim 1, characterized in that: The top of the water tank body (1) is also provided with an inspection and observation hole (30).

9. A voltage stabilization method for a closed cooling water system of a peak-shaving thermal power plant, characterized in that: The method comprises using the adjustable expansion water tank for peak load regulation thermal power plant as claimed in claim 1, and further comprising the following steps: Step A1: connecting the water tank body (1) to the closed cold water system (2) via the water inlet pipe (3); Step A2: using a pressure adjustment component (7) to adjust the internal pressure of the water tank body (1) to match the internal pipe pressure of the closed cold water system (2); Step A3: setting an action threshold of the monitoring component (8), and then electrically connecting the monitoring component (8) to the pressure adjustment component (7) and the external water supply pump, respectively, to achieve linkage control of the pressure adjustment component (7) and the external water supply pump by the monitoring component (8).

10. A voltage stabilization method for a closed cooling water system of a peak-shaving thermal power plant according to claim 9, characterized in that: The step A1 also includes the following steps: calculating the volume of the balancing water (5) entering the water tank body (1), wherein the calculation method is: setting the initial pre-charge pressure in the water tank body (1), the maximum working pressure of the closed cold water system (2) and the minimum working pressure of the closed cold water system (2), and then calculating the volume of the balancing water (5) according to the following formula: In the formula, represents the equilibrium volume of water (5), Indicates the volume of the water tank body (1), Indicates the initial pre-charge pressure in the water tank body (1), Indicates the maximum working pressure of the closed cold water system (2), Indicates the minimum working pressure of the closed cold water system (2).

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