Power plant heat-releasing feedwater to condenser injection system

Abstract

The utility model relates to power generation technical field discloses a kind of power plant heat-releasing feedwater to condensing tank water injection system, comprising: water injection pipeline, the water injection pipeline is connected with condensing tank in heat storage steam-water system after the mother pipe of heat-releasing feedwater regulating door, first isolation valve is provided in the water injection pipeline near input end, the water injection pipeline is also in this series with heat compensator and regulating valve along conveying direction.The utility model connects heat-releasing steam-water system and heat storage steam-water system, for heat storage steam-water system, can shorten condensing tank water storage time, advance warm heat storage return water pump warm pump time, reach the purpose of reducing molten salt usage amount when warm pipe, advance pre-warming heat storage return water pump, to increase the purpose of heat storage length of time;For heat-releasing steam-water system, when the temperature of heat-releasing feedwater pump outlet is lower, water is hit to condensing tank, while water injection of condensing tank reaches the purpose of improving heat-releasing feedwater system pipeline temperature, avoids heat-releasing system pipeline water storage waste, and simultaneously avoids heat-releasing system pipe collision.

Description

Technical Field

[0001] This utility model relates to the field of steam extraction energy storage technology, and more specifically, it relates to a power plant heat release feedwater to condensate tank water injection system. 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] During heat release, the deaerator water in the power plant enters the molten salt-steam generator (SGS) system via the molten salt heat release feedwater pump. After passing through the heat exchanger and steam drum, it is gradually heated by the molten salt to complete evaporation. Then, it is further heated by the high-temperature molten salt in the superheater to reach a suitable outlet temperature before returning to the power plant's reheat steam system. In the initial startup phase of the thermal storage system, the inlet water volume of the thermal storage return water pump is small, insufficient to start the pump. At this time, the pump body and pipelines along the route are warmed up through the condensate tank. Therefore, the water volume and temperature in the condensate tank determine the warm-up time for the thermal storage system.

[0004] In existing technologies, the condensate steam after molten salt is added brings the water level in the condensate tank to the level required to start the thermal storage return water pump. However, if this process takes too long, it can easily cause the subcooled water at the outlet of the heat exchanger in the thermal storage system to vaporize, leading to overheating and overpressure in the equipment, and overheating of the thermal storage return water system, which can damage the equipment. Excessive warm-up time also increases the amount of molten salt used, reducing both the thermal storage energy and the duration of operation. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a power plant heat release feedwater to condensate tank water injection system, which shortens the water storage time of the condensate tank and advances the warm-up time of the heat storage return water pump, thereby reducing the amount of molten salt used during pipe warm-up and preheating the heat storage return water pump in advance, thus increasing the heat storage time.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: The power plant's heat release feedwater to condensate tank water injection system includes: The water injection pipeline connects the main pipe after the heat release water regulating valve to the condensate tank in the heat storage steam-water system. A first isolation valve is installed near the input end of the water injection pipeline. A heat replenisher and a regulating valve are also connected in series along the conveying direction of the water injection pipeline.

[0007] As a further improvement to this utility model, a temporary storage tank is provided between the first isolation valve and the heater. The inlet of the temporary storage tank is connected to the output end of the first isolation valve, and the outlet of the temporary storage tank is connected to the inlet end of the heater.

[0008] As a further improvement to this utility model, the temporary storage tank is also provided with a return port, which is connected to the main pipe after the heat release water regulating valve through a return water pipe.

[0009] As a further improvement to this utility model, a return water pump is provided on the return water pipe, and a check valve is provided at the output end of the return water pipe.

[0010] As a further improvement to this utility model, the water heated by the heater is transported to the condensate tank through the regulating valve.

[0011] The beneficial technical effects of this utility model are: This invention connects the exothermic steam-water system with the thermal storage steam-water system. For the thermal storage steam-water system, it can shorten the water storage time of the condensate tank and advance the warm-up time of the thermal storage return water pump, thereby reducing the amount of molten salt used during pipe warm-up and preheating the thermal storage return water pump in advance, thus increasing the thermal storage time.

[0012] For exothermic steam-water systems, water can be pumped to the condensate tank when the outlet temperature of the exothermic feed water pump is low. While filling the condensate tank with water, the temperature of the exothermic feed water system pipeline is increased, thus avoiding water waste in the exothermic system pipeline and preventing pipe collisions in the exothermic system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall layout of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model.

[0014] In the diagram: 100, exothermic steam-water system; 200, thermal storage steam-water system; 1, water injection pipeline; 2, first isolation valve; 3, temporary storage tank; 4, supplementary heater; 5, regulating valve; 6, return water pipeline; 7, second isolation valve; 8, check valve; 9, return water pump. 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 1-2 The present invention provides the following embodiments: The power plant's heat release feedwater to condensate tank water injection system includes a water injection pipeline 1. Water injection pipeline 1 connects the main pipe after the heat release feedwater regulating valve to the condensate tank in the thermal steam-water storage system 200. A first isolation valve 2 is installed near the input end of water injection pipeline 1. A supplementary heater 4 and a regulating valve 5 are also connected in series along the conveying direction of water injection pipeline 1. Figure 1 and Figure 2 The inlet of water injection pipe 1 is connected to the main pipe after the water supply regulating valve of the exothermic steam-water system 100, and the outlet of water injection pipe 1 is connected to the condensate tank in the thermal storage steam-water system 200. Water injection through water injection pipe 1 benefits both the exothermic steam-water system 100 and the thermal storage steam-water system 200. For the thermal storage steam-water system 200, it shortens the condensate tank storage time and advances the warm-up time of the thermal storage return water pump, thereby reducing the amount of molten salt used during pipe warm-up and increasing the thermal storage return water pump's storage time. For the exothermic steam-water system 100, water can be pumped to the condensate tank when the outlet temperature of the exothermic feed water pump is low. This simultaneously increases the temperature of the exothermic feed water system pipelines, preventing water waste in the exothermic system pipelines and avoiding pipe collisions. When both the exothermic steam-water system 100 and the thermal storage steam-water system 200 are running stably, the water injection pipeline 1 can be cut off by the first isolation valve 2, causing the water injection pipeline 1 to fail, thus providing flexible control.

[0017] As another preferred embodiment of this utility model, a temporary storage tank 3 is provided between the first isolation valve 2 and the heater 4. The inlet of the temporary storage tank 3 is connected to the output end of the first isolation valve 2, and the outlet of the temporary storage tank 3 is connected to the inlet end of the heater 4. Figure 2 Specifically, the temporary storage tank 3 serves as a temporary storage unit. Water first enters the temporary storage tank 3, and then can enter the condensate tank through the heater 4 and the regulating valve 5. Due to the presence of the temporary storage tank 3, the control of the water injection volume is more accurate and has room for error.

[0018] As another preferred embodiment of this utility model, the temporary storage tank 3 is also provided with a return port, which is connected to the main pipe after the heat release water regulating valve via the return water pipe 6. Specifically, after the condensate tank is filled with water, the remaining water in the temporary storage tank 3 can be returned to the heat release steam-water system 100. A second isolation valve 7 is provided at the inlet of the return water pipe 6.

[0019] As another preferred embodiment of this utility model, a return water pump 9 is provided on the return water pipe 6, and a check valve 8 is provided at the output end of the return water pipe 6. The return water pump 9 serves to transport and return the water, and the check valve 8 serves to prevent backflow.

[0020] In another preferred embodiment of this utility model, the water heated by the heater 4 is transported to the condensate tank through the regulating valve 5. Specifically, to ensure that the water temperature and volume are appropriate, the water can be heated by the heater 4, while the regulating valve 5 can adjust the water volume.

[0021] The above are merely preferred embodiments of this utility model and are not intended to limit this 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 this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A power plant heat release feedwater to condensate tank water injection system, characterized in that, include: Water injection pipeline (1), the water injection pipeline (1) connects the main pipe after the heat release water regulating valve to the condensate tank in the heat storage steam and water system (200), the water injection pipeline (1) is provided with a first isolation valve (2) near the input end, and the water injection pipeline (1) is also connected in series with a heat replenisher (4) and a regulating valve (5) along the conveying direction.

2. The power plant heat release feedwater to condensate tank water injection system according to claim 1, characterized in that, A temporary storage tank (3) is provided between the first isolation valve (2) and the heater (4). The inlet of the temporary storage tank (3) is connected to the output end of the first isolation valve (2), and the outlet of the temporary storage tank (3) is connected to the inlet end of the heater (4).

3. The power plant heat release feedwater to condensate tank water injection system according to claim 2, characterized in that, The temporary storage tank (3) is also provided with a return port, which is connected to the main pipe after the heat release water regulating valve through the return water pipe (6).

4. The power plant heat release feedwater to condensate tank water injection system according to claim 3, characterized in that, A return water pump (9) is installed on the return water pipe (6), and a check valve (8) is installed at the output end of the return water pipe (6).

5. The power plant heat release feedwater to condensate tank water injection system according to claim 1, characterized in that, The water heated by the heater (4) is transported to the condensate tank through the regulating valve (5).

Images