Power generation system for recycling potential energy of make-up water of thermal power plant

Abstract

The utility model discloses a power generation system for recovering the potential energy of the make-up water of a thermal power plant, which comprises a reservoir and a tail water pool, the make-up water is stored in the reservoir, a power generation device and an energy dissipation valve are arranged between the reservoir and the tail water pool, the reservoir is located at the highest position of the power generation system, and the water outlet end of the reservoir is connected with a water conveying pipeline. The water conveying pipeline is connected with the power generation device, the water conveying pipeline is communicated with a bypass pipeline connected with the energy dissipation valve, the power generation device and the energy dissipation valve are both connected with the tail water pool through a tail water pipeline, and a switching valve is further arranged on the bypass pipeline connected with the energy dissipation valve. According to the utility model, the mountaintop make-up water system is used as an upper reservoir, the power generation device is used for recovering potential energy of make-up water, and discharged tail water enters the water treatment system to provide living and production water for the power plant, so that not only can energy be dissipated and construction of energy dissipation facilities be reduced, but also power can be generated, and a thermal power plant can play greater social benefits and economic benefits.

Description

Technical Field

[0001] The utility model belongs to the technical field of feed water energy dissipation, and in particular relates to a power generation system for recovering the potential energy of feed water in a thermal power plant. Background Art

[0002] At present, power plants in mountainous areas in the southwest usually set up feed water systems on the top of the mountain to provide living and production water for downstream workers. Due to the large height difference between the reservoir on the top of the mountain and the downstream power plant, most water heads exceed 200m, and the potential energy cannot be completely offset by the resistance along the way. It is usually necessary to set up energy dissipation facilities in the power plant to eliminate the surplus energy so that it can smoothly enter the tailwater pool. However, the construction of energy dissipation facilities is relatively expensive, resulting in an increase in project investment costs. On the other hand, the energy dissipation facilities also require electric adjustment of water flow changes, which further increases energy consumption. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a power generation system for recovering the potential energy of feed water in a thermal power plant. The feed water system on the top of the mountain is used as an upper reservoir, and the potential energy of the feed water is recovered by a power generation device. The discharged tail water enters the water treatment system to provide living and production water for the power plant. It can not only dissipate energy and avoid the construction of energy dissipation facilities, but also generate electricity, that is, the feed water system can be reused to better play its water energy benefits and enable the thermal power plant to play a greater social and economic benefit.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A power generation system for recovering the potential energy of feed water in a thermal power plant comprises a water reservoir and a tailwater tank, wherein feed water is stored in the water reservoir, a power generation device and an energy dissipation valve are arranged between the water reservoir and the tailwater tank, the water reservoir is located at the highest point of the power generation system, a water delivery pipeline is connected to the water outlet of the water reservoir, the water delivery pipeline is connected to the power generation device, a bypass pipeline connected to the energy dissipation valve is connected to the water delivery pipeline, the power generation device and the energy dissipation valve are both connected to the tailwater tank through the tailwater pipeline, and a switching valve is also arranged on the bypass pipeline connected to the energy dissipation valve.

[0006] In one embodiment, the bottom of the water reservoir is higher than the ground, and the water pipeline is buried in the ground at the bottom of the water reservoir and is connected to the water outlet of the water reservoir.

[0007] In one embodiment, the water delivery pipeline is also provided with an outlet valve.

[0008] In one embodiment, a vent valve and a vent pipeline connected to the vent valve are provided at the lowest position of the water delivery pipeline located in the power generation system.

[0009] In one embodiment, a plurality of exhaust valves are evenly spaced apart on the water delivery pipeline.

[0010] In one embodiment, the power generation device includes a plurality of hydro-generator sets connected in parallel, and the plurality of hydro-generator sets are connected to the water pipeline through power generation pipelines.

[0011] In one embodiment, the tailwater pipe connected to the power generation device has a water outlet in a trumpet structure at one end close to the tailwater pool, and the cross-sectional area of ​​the trumpet structure gradually increases in a direction away from the power generation device.

[0012] In one embodiment, each power generation pipeline is provided with an inlet valve, and each tailwater pipeline connected to the hydro-generator set is also provided with a tailwater gate at the connection with the tailwater pool.

[0013] In one embodiment, the top of the tailwater pool is higher than the ground, and the water outlet of the tailwater pool is connected to a water treatment system.

[0014] In one embodiment, the water storage tank and the tailwater tank are both made of reinforced concrete.

[0015] The beneficial effects of the utility model are:

[0016] (1) The top of the mountain feed water system is used as the upper reservoir, and the potential energy of the feed water is recovered by the power generation device. The discharged tail water enters the water treatment system to provide domestic water for the power plant. This can not only dissipate energy, reduce the construction of energy dissipation facilities, and save costs, but also generate electricity. That is, the feed water system can be reused to better play the role of water energy and enable the thermal power plant to achieve greater social and economic benefits. The energy dissipation valve connected in parallel with the power generation device can temporarily dissipate the energy of the feed water when the power generation device is under maintenance to avoid excessive pressure of the feed water entering the tail water pool.

[0017] (2) The power generation device is composed of a plurality of hydro-turbine generator sets connected in parallel, so that when any of the hydro-turbine generator sets fails or is undergoing maintenance, another hydro-turbine generator set can be switched to operate.

[0018] (3) The bottom of the reservoir is set higher than the ground, which can effectively ensure the emptying and overflow of the reservoir. The water pipeline is buried in the ground below the reservoir to ensure the submerged water depth of the water pipeline. The end of the tailwater pipeline has a trumpet-shaped outlet to reduce the flow velocity of the water outlet and optimize the water flow state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0020] in:

[0021] Figure 1 The schematic diagram of the system structure of the utility model is shown;

[0022] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0023] Reference numerals:

[0024] 1- water storage tank, 2- water transmission pipeline, 3- vent valve, 4- exhaust valve, 5- outlet valve, 6- turbine generator set, 7- inlet valve, 8- switching valve, 9- energy dissipation valve, 10- tailwater gate, 11- tailwater pipeline, 12- tailwater tank, 13- vent pipeline, 14- bypass pipeline, 15- power generation pipeline. DETAILED DESCRIPTION

[0025] The utility model will be further described below in conjunction with the accompanying drawings.

[0026] The utility model provides a power generation system for recovering the potential energy of feed water in a thermal power plant, such as Figure 1 As shown, it includes a reservoir 1 and a tailwater tank 12, the reservoir 1 stores make-up water, a power generation device and an energy dissipation valve 9 are arranged between the reservoir 1 and the tailwater tank 12, the reservoir 1 is located at the highest point of the power generation system, the water outlet of the reservoir 1 is connected to a water delivery pipe 2, the water delivery pipe 2 is connected to the power generation device, the water delivery pipe 2 is connected to a bypass pipe 14 connected to the energy dissipation valve 9, the power generation device and the energy dissipation valve 9 are connected to the tailwater tank 12 through the tailwater pipe 11, and a switching valve 8 is also arranged on the bypass pipe 14 connected to the energy dissipation valve 9;

[0027] It should be noted that, since the make-up water system is often set up on the top of a mountain to provide living and production water for the downstream staff, the height difference between the water reservoir 1 and the downstream power plant is large, and most of the water heads exceed 200m. Its potential energy cannot be completely offset by the resistance along the way. The potential energy of the make-up water is recovered by the power generation device, and the discharged tail water enters the water treatment system to provide living and production water for the power plant. It can not only dissipate energy and avoid the construction of energy dissipation facilities, but also generate electricity, that is, the make-up water system can be reused to better play the water energy benefits and enable the thermal power plant to play a greater social and economic benefit. At the same time, the energy dissipation valve 9 connected in parallel with the power generation device can temporarily dissipate energy for the make-up water when the power generation device is overhauled to avoid excessive pressure of the make-up water entering the tail water pool 12. The water pipeline 2 is buried in the ground below the water reservoir 1 to ensure the submerged water depth of the water pipeline 2;

[0028] Furthermore, if Figure 1 As shown, an outlet valve 5 is also provided on the water pipeline 2, a vent valve 3 and a vent pipeline 13 connected to the vent valve 3 are provided at the lowest position of the water pipeline 2 located in the power generation system, and a plurality of exhaust valves 4 are evenly spaced on the water pipeline 2;

[0029] It should be noted that the outlet valve 5 is located at the starting point of the water pipeline, that is, it is used to cut off the water flow when the water pipeline is repaired, and the vent valve 3 is set at the lowest point of the power generation system, that is, because the terrain along the water flow is winding, such as when passing through the canyon terrain, the horizontal height of this place is lower than the tailwater pool 12, which is at the lowest point of the power generation system, that is, the vent valve 3 and the vent pipeline are set here to vent the water in the water pipeline when the water pipeline is repaired, and the multiple exhaust valves 4 evenly spaced along the water pipeline 2 are used to vent the gas in the water pipeline when the water pipeline is filled with water;

[0030] In one embodiment, the water reservoir 1 and the tailwater pool 12 are both made of reinforced concrete, the bottom of the water reservoir 1 is higher than the ground, the water pipeline 2 is buried in the ground at the bottom of the water reservoir 1 and is connected to the water outlet of the water reservoir 1, the top of the tailwater pool 12 is higher than the ground, and the water outlet of the tailwater pool 12 is connected to the water treatment system;

[0031] It should be noted that setting the bottom of the water reservoir 1 higher than the ground can effectively ensure the emptying and overflow of the water reservoir 1. The tailwater tank 12 is located at the end of the power generation system. On the one hand, it is used to store the replenishment water after energy dissipation, and on the other hand, it ensures that the tailwater pipeline 11 is in a full flow state;

[0032] In one embodiment, the power generation device includes a plurality of hydro-generator sets 6 connected in parallel, and the plurality of hydro-generator sets 6 are respectively connected to the water delivery pipeline 2 through the power generation pipeline 15. The tailwater pipeline 11 connected to the power generation device has a trumpet-shaped outlet at one end close to the tailwater pool 12, and the cross-sectional area of ​​the trumpet structure gradually increases in the direction away from the power generation device. An inlet valve 7 is provided on each power generation pipeline 15, and a tailwater gate 10 is also provided at the connection between each tailwater pipeline connected to the hydro-generator set 6 and the tailwater pool 12. The switching valve 8 is electrically driven and is used to realize rapid switching of the pipeline when the hydro-generator set 6 fails.

[0033] It should be noted that, in the present embodiment, the power generation device is composed of two mutually parallel hydro-generator sets 6, so that it is convenient to switch to another hydro-generator set 6 for operation when any of the hydro-generator sets 6 fails or is under maintenance. The hydro-generator set 6 can be selected into various types such as axial flow, cross-flow and mixed flow according to the size of the pipeline flow and pressure. In the present embodiment, the mixed flow type is adopted, which can better suit the characteristics of high positive pressure head of the mountaintop reservoir 1 and achieve the purpose of efficient operation. The end of the tailwater pipe 11 has a water outlet with a trumpet structure, which reduces the flow velocity of the water outlet and optimizes the flow state of the water. The inlet valve 7 controls the feed water in the power generation pipeline 15 to enter the hydro-generator set 6, and at the same time cooperates with the tailwater gate 10 to cut off the water flow at both ends when the hydro-generator set 6 is under maintenance.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments, and other arrangements may be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in a manner different from that described in the original claims. It may also be understood that the features described in conjunction with the individual embodiments may be used in other described embodiments.

Claims

1. A power generation system for recovering the potential energy of feed water in a thermal power plant, characterized in that: It includes a water reservoir and a tailwater tank, wherein the water reservoir stores feed water, a power generation device and an energy dissipation valve are arranged between the water reservoir and the tailwater tank, the water reservoir is located at the highest point of the power generation system, a water supply pipeline is connected to the water outlet of the water reservoir, the water supply pipeline is connected to the power generation device, a bypass pipeline connected to the energy dissipation valve is connected to the water supply pipeline, the power generation device and the energy dissipation valve are both connected to the tailwater tank through the tailwater pipeline, and a switching valve is also arranged on the bypass pipeline connected to the energy dissipation valve.

2. A power generation system for recovering the potential energy of feed water in a thermal power plant according to claim 1, characterized in that: The bottom of the water reservoir is higher than the ground, and the water pipeline is buried in the ground at the bottom of the water reservoir and is connected with the water outlet of the water reservoir.

3. A power generation system for recovering potential energy of feed water in a thermal power plant according to claim 1, characterized in that: The water delivery pipeline is also provided with an outlet valve.

4. A power generation system for recovering potential energy of feed water in a thermal power plant according to claim 1, characterized in that: The water delivery pipeline is provided with a vent valve and a vent pipeline connected with the vent valve at the lowest position of the power generation system.

5. A power generation system for recovering potential energy of feed water in a thermal power plant according to claim 1, characterized in that: A plurality of exhaust valves are evenly spaced on the water delivery pipeline.

6. A power generation system for recovering potential energy of feed water in a thermal power plant according to claim 1, characterized in that: The power generation device comprises a plurality of water turbine generator sets connected in parallel, and the plurality of water turbine generator sets are connected to the water delivery pipeline through power generation pipelines respectively.

7. A power generation system for recovering the potential energy of feed water in a thermal power plant according to claim 1 or 6, characterized in that: The tailwater pipe connected to the power generation device has a water outlet in a trumpet structure at one end close to the tailwater pool, and the cross-sectional area of ​​the trumpet structure gradually increases in the direction away from the power generation device.

8. A power generation system for recovering potential energy of feed water in a thermal power plant according to claim 6, characterized in that: Each power generation pipeline is provided with an inlet valve, and each tailwater pipeline connected to the hydro-generator set is also provided with a tailwater gate at the connection with the tailwater pool.

9. A power generation system for recovering potential energy of feed water in a thermal power plant according to claim 1, characterized in that: The top of the tailwater pool is higher than the ground, and the water outlet of the tailwater pool is connected to a water treatment system.

10. A power generation system for recovering potential energy of feed water in a thermal power plant according to claim 1, characterized in that: The water reservoir and the tailwater pool are both made of reinforced concrete.

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