Circulating system using condenser drainage

Abstract

The application discloses a circulating system using condenser drainage, wherein a soft water tank and a cold water tower are communicated with a clarification tank; a clean water tank, a heat exchanger B, a primary filter device, an ultrafiltration device, a reverse osmosis device and a desalination system are sequentially communicated between the clarification tank and the soft water tank; a boiler is communicated between the soft water tank and a steam turbine; the steam turbine drives a generator; the steam turbine is sequentially communicated with a siphon well and a condenser drainage tank through a condenser; the condenser drainage tank is communicated with the boiler and the heat exchanger B; a heat exchanger D and a heating water tank are sequentially arranged along the flow direction of a heating return water pipeline of a heating circulating system; hot water in the condenser drainage tank is communicated with the soft water tank after heat exchange; and the heating return water returns to the heating water tank after heat exchange. According to the above structure, the circulating system using condenser drainage uses the heat energy of the low-pressure cylinder exhaust of the steam turbine to sequentially heat the water for producing soft water in the system and the return water of the heating system.

Description

Technical Field

[0001] This invention relates to the technical field of a heating system that utilizes waste heat from a condenser, and more specifically to a circulation system that utilizes condenser drainage. Background Technology

[0002] Exhaust steam from thermal power plants' turbines is typically discharged directly using either open-loop or closed-loop cooling systems, resulting in significant cold-end losses. This heat is characterized by its low grade and high concentration, making it difficult to utilize directly. Efficiently recovering and utilizing this energy would significantly improve power plant energy efficiency, reduce coal consumption for power generation, increase heating area, and enhance enterprise competitiveness.

[0003] The background technology and appendix of the specification of patent number 201220278459.4 Figure 1 It is known that cooling water from river or seawater undergoes simple filtration through a trash rack and steel gate, then is pressurized by a circulating water pump and transported to the condenser. Inside the condenser, it fully absorbs the waste heat from the exhaust steam discharged from the low-pressure cylinder of the turbine, then heats up and enters the siphon well, finally being discharged from the siphon well into the nearby river or seawater. This process results in heat waste in the condenser. While the existing patent literature provides an improved technical solution that utilizes the heat of the condenser, this solution utilizes relatively little of the condenser's heat. As shown in Figures 2-4 of the specification, the steam extracted from the turbine's extraction end is directly discharged after heat exchange with an absorption heat pump and a steam-water heat exchanger, resulting in the waste of the extracted steam's heat. Even if the extracted steam condenses into water after heat exchange with the absorption heat pump and steam-water heat exchanger, this condensate still contains some heat and can still be used for heat exchange. The existing technology, however, directly discharges the condensate, leading to heat waste and loss. Moreover, the water-to-water heat exchanger only exchanges heat once with the external water source, such as river water or seawater, to preheat the water. The preheating effect is relatively limited, and the residual temperature of the heat exchange circulating water after the heat exchange is still relatively higher than the normal temperature of the external water source. This results in a relatively limited effect on the reheating and cooling of the exhaust steam in the condenser.

[0004] In addition, the water temperature from external sources is relatively low in winter, resulting in a relatively high temperature rise, a higher temperature difference for the boiler to heat water into steam, and increased energy consumption. During the winter heating season, the power plant also needs to provide additional heat or energy to heat the return water pipes of the heating system, which further increases the power plant's production energy consumption.

[0005] The technical problem to be solved by this application is how to effectively improve the utilization rate of heat from condenser drainage, reduce production energy consumption, and utilize the heat from condenser drainage to provide heat to the heating system. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a circulating system that utilizes condenser drainage. This system can fully utilize the heat energy from the exhaust gas from the low-pressure cylinder of the steam turbine. The heat generated by the condenser drainage and the heat from the circulating water used for heat exchange in the condenser are used to sequentially heat the water used for producing soft water and the return water from the heating system. This ensures that both the ultrafiltration and reverse osmosis devices operate at their optimal levels, thereby guaranteeing the effectiveness of both processes. Furthermore, the system effectively preheats the soft water, reaching a stable preheating temperature before the steam turbine exhaust heats it. This allows the soft water to enter the boiler at a stable, relatively high initial temperature, thereby improving boiler energy efficiency and reducing boiler energy consumption.

[0007] The technical solution adopted in this invention is:

[0008] The circulating system utilizing condenser drainage includes a clarification tank for connecting to an external water source. The clarification tank is connected to a soft water tank for providing steam to drive the turbine and a cooling tower for providing heat exchange circulating water to the condenser. A clear water tank, heat exchanger B, a primary filter, an ultrafiltration device, a reverse osmosis device, and a desalination system are sequentially connected between the clarification tank and the soft water tank. A boiler is connected between the soft water tank and the turbine. The turbine drives a generator. The low-pressure exhaust port of the turbine is sequentially connected to a siphon well and a condenser drainage pool through the condenser. The condenser drainage pool is connected to both the boiler and heat exchanger B. The system also includes a heat exchanger D and a hot water supply tank, arranged sequentially along the flow direction of the heat return water in the heating circulation system. The hot water in the condenser drainage pool is heated by heat exchanger B and then by heat exchanger D, and connected to the soft water tank. The returning heat return water is heated by heat exchanger D and then enters the hot water supply tank for insulation.

[0009] A further improvement of the present invention is that a heat exchanger A is also connected between the clean water tank and the air supply B. After the circulating water has been heated by the condenser, it is connected to the drainage well after being heated by the heat exchanger A. The drainage well discharges the water to an external water source.

[0010] A further improvement of the present invention is that a heat exchanger C is also connected to the side of the heat exchanger D facing away from the hot water tank on the heating return water pipeline. The circulating water after heat exchange in the condenser passes through heat exchanger A in sequence, then passes through heat exchanger C again, and finally connects to the drainage well.

[0011] A further improvement of the present invention is that the circulating water after heat exchange in heat exchanger C is also connected to the clean water tank.

[0012] A further improvement of the present invention is that the desalination system is also connected to a neutralization tank, the neutralization tank is connected to a wastewater treatment system, the wastewater treatment system is connected to the bottom of a clarification tank, the outlet of the wastewater treatment system is connected to a drainage well, and the sludge outlet of the wastewater treatment system is connected to a sludge cake collection device.

[0013] A further improvement of the present invention is that the outlet of the wastewater treatment system is also connected to a cooling tower.

[0014] A further improvement of the present invention is that a pump F is connected between the neutralization tank and the wastewater treatment system, and a pump H is connected between the clarification tank and the wastewater treatment system.

[0015] A further improvement of the present invention is that the inlet of the clarifier is connected to an external water source via pump A; pump B is connected between the heat exchanger B and the primary filter; pump C is connected between the soft water tank and the boiler; pump D is connected between the cooling tower and the condenser; pump E is connected between the condenser drainage pool and the boiler; pump G is connected between the condenser drainage pool and the heat exchanger B; and the outlet of the hot water tank is connected to the heating outlet pipe of the heating circulation system via pump I.

[0016] A further improvement of the present invention is that the clarification tank is also connected to an industrial water tank.

[0017] A further improvement of the present invention is that the cooling tower is connected to the industrial water tank via pump D.

[0018] The beneficial effects of this invention are as follows:

[0019] First, the circulating system utilizing condenser drainage of the present invention can fully utilize the heat energy of the exhaust gas from the low-pressure cylinder of the steam turbine. The heat generated by the condenser drainage and the heat of the circulating water used for heat exchange in the condenser are used to sequentially heat the water used for producing soft water and the return water of the heating system, so that the ultrafiltration device and the reverse osmosis device are at their optimal performance, thereby ensuring the ultrafiltration and reverse osmosis effects. Moreover, it can effectively preheat the soft water, reaching a stable preheating temperature before the steam turbine exhaust heats the soft water, thus enabling the soft water to enter the boiler at a stable and higher initial temperature, thereby improving the boiler's energy efficiency and reducing boiler energy consumption.

[0020] Secondly, the circulating system of the present invention utilizes condenser drainage. The sludge in the clarifier and the wastewater from the desalination system after neutralization are treated together by the wastewater treatment system to obtain dry mud cakes that are easy to collect and recycle. The water obtained after treatment can reach the quality of the upper clear water in the clarifier and can then be reused in a cooling tower or industrial water tank. If the water obtained after treatment is not needed, it can also be discharged to the water source through the drainage well. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this application. Detailed Implementation

[0022] like Figure 1 It is understood that the circulating system utilizing condenser drainage includes a clarification tank 1 for connecting to an external water source. The clarification tank 1 is connected to a soft water tank 8 for providing steam to drive the turbine 10 and a cooling tower 3 for providing heat exchange circulating water to the condenser 12. Between the clarification tank 1 and the soft water tank 8, a clear water tank 2, a heat exchanger B19, a primary filter 4, an ultrafiltration device 5, a reverse osmosis device 6, and a desalination system 7 are sequentially connected. A boiler 9 is connected between the soft water tank 8 and the turbine 10. The turbine 10 drives a generator 11. The low-pressure exhaust port of 10 is connected in sequence to the siphon well 13 and the condenser drain pool 14 through the condenser 12. The condenser drain pool 14 is connected to the boiler 9 and the heat exchanger B19 respectively. It also includes the heat exchanger D21 and the hot water tank 32 arranged in sequence along the flow direction of the heat return water of the heating circulation system. The hot water in the condenser drain pool 14 is heated by the heat exchanger B19 and then by the heat exchanger D21 and is connected to the soft water tank 8. The returned heat return water is heated by the heat exchanger D21 and then enters the hot water tank 32 for heat preservation.

[0023] A heat exchanger A18 is also connected between the clear water tank 2 and the air supply B19. After the circulating water is heated by the condenser 12, it is connected to the drainage well 17 after being heated by the heat exchanger A18. The drainage well 17 discharges the water to the external water source.

[0024] The heating return water pipeline is also connected to a heat exchanger C20 on the side of heat exchanger D21 facing away from the hot water tank 32. After the circulating water has been heated by the condenser 12, it is heated by the heat exchanger A18 and then by the heat exchanger C20 again before finally connecting to the drainage well 17.

[0025] The circulating water after heat exchange in heat exchanger C20 is also connected to the clean water tank 2.

[0026] The desalination system 7 is also connected to a neutralization tank 15, which is connected to a wastewater treatment system 16. The wastewater treatment system 16 is connected to the bottom of the clarification tank 1. The outlet of the wastewater treatment system 16 is connected to a drainage well 17, and the sludge outlet of the wastewater treatment system 16 is connected to a sludge cake collection device.

[0027] The outlet of the wastewater treatment system 16 is also connected to the cooling tower 3.

[0028] A pump F28 is connected between the neutralization tank 15 and the wastewater treatment system 16, and a pump H30 is connected between the clarification tank 1 and the wastewater treatment system 16.

[0029] The location of the drainage well 17, which discharges water to an external water source, is downstream of the location where the clarification pool 1 is connected to the external water source.

[0030] The inlet of the clarifier 1 is connected to an external water source via pump A23. Pump B24 is connected between the heat exchanger B19 and the primary filter 4. Pump C25 is connected between the soft water tank 8 and the boiler 9. Pump D26 is connected between the cooling tower 3 and the condenser 12. Pump E27 is connected between the condenser drainage pool 14 and the boiler 9. Pump G29 is connected between the condenser drainage pool 14 and the heat exchanger B19. The outlet of the hot water supply tank 32 is connected to the heating outlet pipe of the heating circulation system via pump I31.

[0031] The clarification tank 1 is also connected to an industrial water tank 22.

[0032] The cooling tower 3 is connected to the industrial water tank 22 via pump D26.

[0033] In this invention, water in the cooling tower 3 exchanges heat with the low-pressure cylinder exhaust in the condenser 12 via pump D26, causing the low-pressure exhaust to condense into water, which is then collected in the condenser drainage pool via a siphon well. Water in the condenser drainage pool 14 heats the water in the clear water tank 2 before it enters the primary filtration device 4 via heat exchanger B19, ensuring the water temperature before ultrafiltration reaches or exceeds 25 degrees Celsius. This allows the ultrafiltration membrane in the ultrafiltration device 5 to achieve optimal permeability, ensuring ultrafiltration efficiency and saving water resources. After heat exchange with the water in the clear water tank 2 entering the primary filtration device 4, the water continues to exchange heat with the water in the return water pipe of the heating circulation system via heat exchanger D21, thereby increasing the return water temperature of the heating circulation system. The temperature of the softened water after heat exchange is similar to that of the softened water after desalination treatment by the desalination system 7, thus achieving preliminary preheating of the softened water. Finally, it enters the softened water tank 8 through pipelines along with the softened water treated by the desalination system 7. The softened water in the softened water tank 8 is heated by the exhaust heat exchange of the steam turbine (the technology of heating the softened water by the exhaust of the steam turbine in this application adopts the existing technology in the field, such as the specification and drawings of the patent with patent number 201220278459.4 mentioned in the background technology of this application, which will not be described in detail in this application, and will not be specifically shown in the specification and drawings). After the initial temperature of the softened water is further increased, it enters the boiler 9 again to be heated into superheated steam to drive the steam turbine 10 again and drive the generator 11 to generate electricity.

[0034] Water in cooling tower 3 exchanges heat with the exhaust gas from the low-pressure cylinder in condenser 12 via pump D26 to form heat exchange circulating water. This allows the low-pressure exhaust gas to condense into water and then be collected in the condenser drainage pool via a siphon well. The heat exchange circulating water, after heat exchange with the low-pressure exhaust gas in condenser 12, preheats the water entering heat exchanger B19 via heat exchanger A18, increasing the water temperature before ultrafiltration. This ensures the water temperature before ultrafiltration is at the optimal operating temperature of the reverse osmosis membrane (25-30 degrees Celsius) before entering reverse osmosis unit 6, guaranteeing the efficiency and effectiveness of reverse osmosis unit 6. After heat exchange with the water entering the primary filtration unit 4 from the clear water tank 2, the water continues to exchange heat with the water in the return water pipe of the heating circulation system via heat exchanger C20. The return water temperature of the heating circulation system can be further increased, thereby reducing the energy consumption required to heat the returned water recovered in the hot water tank 32 of the heating circulation system, or even eliminating the need for additional heating of the returned water. After heat exchange, the temperature of the heat exchange circulating water has dropped to slightly above room temperature, and then enters the drainage well 17 through the pipeline and is discharged to the external water source through the drainage well. When the amount of water supplied to the clear water tank 2 by the clarification tank 1 is relatively small, the heat exchange circulating water after heat exchange enters the clear water tank 2 through the pipeline to ensure the normal operation of the system. Moreover, after the heat exchange circulating water enters the clear water tank 2, the temperature in the clear water tank 2 can also be increased, which is conducive to further increasing the water temperature entering the primary filter device 4, thereby further reducing the heating energy consumption of the system, improving the heating efficiency, and making full use of the heat energy of the heat exchange circulating water.

[0035] The clear water in the upper part of the clarifier 1 can be piped into the clear water tank 2, the cooling tower 3, and the industrial water tank 22 as needed by the system. The water in the industrial water tank 22 can be used for industrial or fire fighting purposes. The sedimented sludge at the bottom of the clarifier 1 is pumped into the wastewater treatment system 16 by pump H30 and the water pumped from the neutralization tank 15 by pump F28 for treatment, thereby obtaining filter-dried sludge cake and relatively clear treated water. The dried sludge cake is collected by a sludge cake collection device, and the treated water is then piped into the cooling tower 3 or the industrial water tank 22.

[0036] The circulating water in the hot water tank 32 is pumped out to the heating pipeline by pump I31 for heating.

Claims

1. A circulation system utilizing condenser drain water, characterized by: The application relates to a water supply system, which comprises a clarifier (1) for connecting with an external water source, a soft water tank (8) for providing steam for driving a steam turbine (10) and a cold water tower (3) for providing heat exchange circulating water of a condenser (12) are communicated with the clarifier (1), a clear water tank (2), a heat exchanger B (19), a primary filter device (4), an ultrafiltration device (5), a reverse osmosis device (6) and a desalination system (7) are sequentially communicated between the clarifier (1) and the soft water tank (8), a boiler (9) is communicated between the soft water tank (8) and the steam turbine (10), the steam turbine (10) drives a generator (11), a low-pressure exhaust port of the steam turbine (10) is sequentially communicated with a siphon well (13) and a condenser water tank (14) through the condenser (12), the condenser water tank (14) is communicated with the boiler (9) and the heat exchanger B (19) respectively, a heat supply return water pipeline of a heat supply circulating system is sequentially provided with a heat exchanger D (21) and a heat supply water tank (32) along the flow direction of the heat supply return water, hot water in the condenser water tank (14) is heated through the heat exchanger B (19) and then heated through the heat exchanger D (21) and communicated with the soft water tank (8), and the heat supply return water is heated through the heat exchanger D (21) and then enters the heat supply water tank (32) for heat preservation. A heat exchanger A (18) is further communicated between the clear water tank (2) and the heat exchanger B (19), circulating water heated through the condenser (12) is sequentially heated through the heat exchanger A (18) and communicated with a drainage well (17), and the drainage well (17) drains water to the external water source. A heat exchanger C (20) is further communicated on the heat supply return water pipeline on the side of the heat exchanger D (21) away from the heat supply water tank (32), circulating water heated through the condenser (12) is sequentially heated through the heat exchanger A (18) and then heated through the heat exchanger C (20) and finally communicated with the drainage well (17). The circulating water heated through the heat exchanger C (20) is further communicated with the clear water tank (2).

2. The circulation system using condenser drain water as claimed in claim 1, wherein: The desalination system (7) is further communicated with a neutralization tank (15), the neutralization tank (15) is communicated with a waste water treatment system (16), the waste water treatment system (16) is communicated with the bottom of the clarifier (1), a water outlet of the waste water treatment system (16) is communicated with the drainage well (17), and a slag outlet of the waste water treatment system (16) is communicated with a mud cake collecting device.

3. The circulation system utilizing condenser drain water of claim 2, wherein: The water outlet of the waste water treatment system (16) is further communicated with the cold water tower (3).

4. The circulating system using condenser drainage according to claim 2 or 3, characterized by: A pump F (28) is communicated between the neutralization tank (15) and the waste water treatment system (16), and a pump H (30) is communicated between the clarifier (1) and the waste water treatment system (16).

5. The circulation system utilizing condenser drain water of claim 1, wherein: The water inlet of the clarifying tank (1) is connected with the external water source through a pump A (23), a pump B (24) is arranged in communication between the heat exchanger B (19) and the primary filter device (4), a pump C (25) is arranged in communication between the soft water tank (8) and the boiler (9), a pump D (26) is arranged in communication between the cold water tower (3) and the condenser (12), a pump E (27) is arranged in communication between the condenser drainage tank (14) and the boiler (9), a pump G (29) is arranged in communication between the condenser drainage tank (14) and the heat exchanger B (19), and the water outlet end of the hot water supply tank (32) is communicated with the hot water supply outlet pipeline of the hot water supply circulation system through a pump I (31).

6. The circulating system using condenser drainage according to claim 1 or 5, characterized by: The clarifying tank (1) is further provided with an industrial water tank (22).

7. The circulation system utilizing condenser drain water of claim 6, wherein: The cold water tower (3) is communicated with the industrial water tank (22) through the pump D (26).

Images