Steam extraction and energy storage backwater recovery system for power plant

Abstract

The utility model relates to the technical field of steam extraction energy storage, and discloses a power plant steam extraction energy storage backwater recovery system, which comprises a recovery pipeline, a first throttling orifice plate and a second throttling orifice plate, and a buffer tank. The utility model has the advantages that a recovery pipeline is introduced on the backwater storage pump outlet mother pipe in front of the backwater storage pump mother pipe discharge door, the water of the backwater storage pump and the pipeline along the way is depressurized and stored at the initial stage of starting the steam extraction energy storage heat storage system, and is discharged into the power plant condenser for recovery, thereby avoiding a large amount of waste caused by direct discharge into a ditch and achieving the effect of energy saving and consumption reduction.

Description

Technical Field

[0001] This utility model relates to the field of steam extraction energy storage technology, and more specifically, to a steam extraction energy storage water recovery system for power plants. Background Technology

[0002] To improve the flexibility of thermal power units, alleviate the pressure on power plants for deep peak shaving, adapt to the needs of a new power system dominated by new energy sources, and enhance the competitiveness of power plants in the future electricity market, a steam extraction storage system is adopted for deep peak shaving. Part of the steam is extracted from the main steam system and the reheat steam system to heat molten salt for heat storage. During peak electricity demand periods, the heat stored in the molten salt storage system is returned to the thermal system, increasing the power plant's output and playing a peak-shaving role. When the unit requires deep peak shaving, the extracted steam is cooled to subcooled water by the heat exchanger of the molten salt storage system and then returned to the power plant's thermal system via a heat storage return pump.

[0003] In the initial stage of starting up a thermal storage system, the thermal storage return water system needs to slowly raise the temperature of the pump body and pipelines to the optimal operating temperature of 220-230℃. During this warm-up period, air and low-temperature water in the pipeline must be discharged through the exhaust valve of the thermal storage return water pump outlet header. Directly draining the thermal storage return water pump outlet header exhaust valve and outlet header drain valve into the ditch results in a large amount of waste and increased costs. Therefore, there is an urgent need to provide a power plant extraction steam storage return water recovery system to solve the above problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a steam extraction storage water recovery system for power plants, which recovers steam condensate during the initial startup and shutdown of the thermal storage system.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: The power plant extraction steam storage return water recovery system is installed between the outlet header of the thermal storage return water pump and the power plant condenser, and includes: A recovery pipeline is installed on the outlet main pipe of the thermal storage return water pump, which is located before the inlet of the discharge gate of the thermal storage return water pump main pipe, and an isolation valve is provided on the recovery pipeline. A primary orifice plate and a secondary orifice plate are connected in series to the recovery pipeline. The output end of the secondary orifice plate is connected to the inlet of the buffer tank. The outlet of the buffer tank is connected to a filter mechanism. The recovered water filtered by the filter mechanism flows into the power plant condenser.

[0006] As a further improvement to this utility model, the flow channel diameter in the first-stage throttling orifice plate is larger than the flow channel diameter in the second-stage throttling orifice plate.

[0007] As a further improvement to this utility model, the buffer tank is provided with an exhaust port.

[0008] As a further improvement to this utility model, the filtration mechanism includes two parallel filters, which serve as backups for each other.

[0009] As a further improvement to this utility model, the filter is a Y-type filter.

[0010] As a further improvement to this utility model, a regulating valve group is provided between the filtration mechanism and the power plant condenser.

[0011] As a further improvement to this utility model, the regulating valve group includes a regulating valve and a check valve. The regulating valve is connected to the output end of the filter mechanism, and the recovered water flowing out from the regulating valve enters the power plant condenser after passing through the check valve.

[0012] The beneficial technical effects of this utility model are: This invention introduces a recovery pipeline on the outlet header of the thermal storage return water pump before the discharge gate of the thermal storage return water pump header. The water from the initial warming thermal storage return water pump and the pipelines along the route of the extraction steam energy storage system is depressurized and stored, and then discharged into the power plant condenser for recovery. This avoids the large amount of waste caused by direct discharge into the ditch and has the effect of energy saving and consumption reduction. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] In the diagram: 100, branch pipeline of the thermal storage return water pump; 200, outlet main pipe of the thermal storage return water pump; 300, discharge valve of the main pipe of the thermal storage return water pump; 1, recovery pipeline; 2, isolation valve; 31, primary throttling orifice plate; 32, secondary throttling orifice plate; 4, buffer tank; 5, filtration mechanism; 61, regulating valve; 62, check valve. Detailed Implementation

[0015] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0016] Combination Figure 1 The present invention provides the following embodiments: The power plant's extraction steam storage return water recovery system is installed between the outlet header 200 of the thermal storage return water pump and the power plant's condenser, such as... Figure 1As shown, the output ends of the two thermal storage return water pump branch pipes 100 are connected to the thermal storage return water pump outlet main pipe 200. The recovery system depressurizes and stores the water from the initial warm thermal storage return water pump and the pipelines along the route during the startup of the steam extraction energy storage thermal storage system, and discharges it into the power plant condenser.

[0017] The recovery system includes a recovery pipeline 1, an isolation valve 2, a primary throttling orifice plate 31, a secondary throttling orifice plate 32, a buffer tank 4, and a filter mechanism 5. The recovery pipeline 1 is installed on the outlet main pipe 200 of the thermal storage return water pump before the input of the discharge gate 300 of the thermal storage return water pump main pipe. That is, the recovery pipeline 1 is connected to the outlet main pipe 200 of the thermal storage return water pump through a bypass before the discharge gate 300 of the thermal storage return water pump main pipe. An isolation valve 2 is installed on the recovery pipeline 1. After the isolation valve 2 is closed, reliable shut-off is achieved. While retaining the original discharge function, a new recovery channel is added to ensure the flexibility of system operation.

[0018] The primary orifice plate 31 and the secondary orifice plate 32 are connected in series to the recovery pipeline 1. The output end of the secondary orifice plate 32 is connected to the inlet of the buffer tank 4, and the outlet of the buffer tank 4 is connected to the filter mechanism 5. The recovered water filtered by the filter mechanism 5 flows into the power plant condenser. Referring to the attached diagram, the recovered water first flows into the primary orifice plate 31 and then into the secondary orifice plate 32, where it undergoes graded pressure reduction through two orifice plates of different sizes. The buffer tank 4 provides volumetric buffering, stabilizes flow fluctuations, and achieves gas-liquid separation. The filter mechanism 5 filters the recovered water, enhancing the protection of subsequent pipelines.

[0019] As another preferred embodiment of this utility model, the flow channel diameter in the primary throttling orifice plate 31 is larger than that in the secondary throttling orifice plate 32. Specifically, the larger orifice plate initially reduces the pressure, and then the smaller orifice plate makes fine adjustments, which can disperse the pressure difference and improve safety.

[0020] As another preferred embodiment of this utility model, the buffer tank 4 is provided with an exhaust port. This serves for gas-liquid separation. Referring to the accompanying drawings, the dashed line on the top of the buffer tank 4 indicates the exhaust pipe.

[0021] As another preferred embodiment of this utility model, the filtration mechanism 5 includes two parallel filters, which serve as backups for each other. This facilitates slag removal and cleaning, as well as maintenance operations. When one filter needs maintenance, the other filter can be activated. Shut-off valves can be designed at the front and rear ends of each filter.

[0022] As another preferred embodiment of this invention, the filter is a Y-type filter. The Y-type filter captures impurities in the pipeline, protecting the downstream section of the recovery system and the condenser.

[0023] As another preferred embodiment of this invention, a regulating valve assembly is provided between the filter mechanism 5 and the power plant condenser. In this embodiment, the regulating valve assembly precisely controls the drainage flow rate to match the condenser's receiving capacity, ensuring stable system recovery.

[0024] As another preferred embodiment of this utility model, the regulating valve assembly includes a regulating valve 61 and a check valve 62. The regulating valve 61 is connected to the output end of the filter mechanism 5. The recovered water flowing out of the regulating valve 61 enters the power plant condenser after passing through the check valve 62. The check valve 62 prevents liquid backflow and avoids water hammer impact.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A power plant extraction steam storage return water recovery system, installed between the outlet header (200) of the thermal storage return water pump and the power plant condenser, characterized in that, include: A recovery pipeline (1) is installed on the outlet main pipe (200) of the thermal storage return water pump on the side before the input of the discharge gate (300) of the thermal storage return water pump main pipe. An isolation valve (2) is provided on the recovery pipeline (1). A primary throttling orifice plate (31) and a secondary throttling orifice plate (32) are connected in series to the recovery pipeline (1). The output end of the secondary throttling orifice plate (32) is connected to the inlet of the buffer tank (4). The outlet of the buffer tank (4) is connected to the filter mechanism (5). The recovered water filtered by the filter mechanism (5) flows into the power plant condenser.

2. The power plant steam extraction storage and water recovery system according to claim 1, characterized in that, The flow channel diameter in the primary throttling orifice plate (31) is larger than the flow channel diameter in the secondary throttling orifice plate (32).

3. The power plant steam extraction storage and water recovery system according to claim 1, characterized in that, The buffer tank (4) is provided with an exhaust port.

4. The power plant steam extraction storage and water recovery system according to claim 1, characterized in that, The filtration mechanism (5) includes two parallel filters, which serve as backups for each other.

5. The power plant steam extraction storage and water recovery system according to claim 4, characterized in that, The filter is a Y-type filter.

6. The power plant steam extraction storage and water recovery system according to claim 1, characterized in that, A regulating valve group is provided between the filter mechanism (5) and the power plant condenser.

7. The power plant steam extraction storage and water recovery system according to claim 6, characterized in that, The regulating valve group includes a regulating valve (61) and a check valve (62). The regulating valve (61) is connected to the output end of the filter mechanism (5). The recycled water flowing out from the regulating valve (61) enters the power plant condenser after passing through the check valve (62).

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