Circulating system for draining water by using condenser

Abstract

A clarification tank is communicated with a softened water tank and a cold water tower, a clear water tank, a heat exchanger B, a primary filtration device, an ultrafiltration device, a reverse osmosis device and a desalting system are sequentially communicated between the clarification tank and the softened water tank, a boiler is communicated between the softened water tank and a steam turbine, and the steam turbine drives a generator. A steam turbine is sequentially communicated with a siphon well and a steam condenser drain tank through a steam condenser, the steam condenser drain tank is respectively communicated with a boiler and a heat exchanger B. A heat supply return water pipeline of a heat supply circulating system is sequentially provided with a heat exchanger D and a heat supply water tank in the flowing direction of heat supply return water, and hot water in the steam condenser drain tank is communicated with a softened water tank after heat exchange. And the returned heat supply return water enters the heat supply water tank after heat exchange. According to the structure, according to the circulation system utilizing the steam condenser to drain water, heat energy of exhausted gas of the low-pressure cylinder of the steam turbine is used for conducting heat exchange and heating on water used for producing soft water in the system and return water of the heat supply system in sequence.

Description

Technical Field

[0001] The invention relates to the technical field of a heating system utilizing condenser waste heat, and in particular to a circulation system utilizing condenser drainage. Background Art

[0002] The exhaust steam from the steam turbine of a thermal power plant is generally discharged directly through open-loop cooling or closed-loop cooling, which results in huge cold-end losses. This part of the heat is characterized by low quality and concentration, but it is difficult to use directly. If this part of the energy can be efficiently recycled and utilized, it will play a significant role in improving the energy utilization rate of power plants, reducing the coal consumption of power generation units, increasing the heating area, and enhancing the competitiveness of enterprises.

[0003] The patent number is 201220278459.4, the background technology of the specification and the appendix of the specification Figure 1 It can be seen that the cooling water from the river or seawater is simply filtered through the trash rack and steel gate, and then is boosted and transported to the condenser by the circulating water pump. After fully absorbing the exhaust heat of the low-pressure cylinder of the turbine in the condenser, it is heated and enters the siphon well, and finally discharged from the siphon well into the nearby river or seawater, which leads to the waste of heat in the condenser. Although the patent document of the prior art provides an improved technical solution to utilize the heat of the condenser, the heat of the condenser utilized by the technical solution is relatively small. It can be seen from the attached drawings 2 to 4 of the specification that the steam extracted from the exhaust end of the turbine is directly discharged after heat exchange through the absorption heat pump and the steam-water heat exchanger, resulting in the waste of heat of the extracted steam. Even if the extracted steam is condensed into water after heat exchange through the absorption heat pump and the steam-water heat exchanger, the condensed water still has a certain amount of heat and can still be heat exchanged. The prior art is directly discharged, resulting in heat waste and loss. Moreover, the water-to-water heat exchanger only exchanges heat once between the heat exchange circulating water and the river water or sea water extracted and collected from the external water source, so as to preheat the water extracted and collected from the external water source. 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 water temperature of the external water source. This leads to a relatively limited re-heat exchange cooling effect on the exhaust end steam in the condenser.

[0004] In addition, in winter, the water temperature of the external water source is relatively low, resulting in a relatively high temperature rise, an increase in the temperature difference of the boiler heating water into steam, and an increase in energy consumption. When the winter heating season comes, the power plant needs to provide additional heat or energy to heat the return pipe of the heating system, resulting in a further increase in the power plant's production energy consumption.

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

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a circulation system utilizing condenser drainage, which can fully utilize the heat energy of the exhaust gas from the low-pressure cylinder of the turbine, and heat the water used for producing soft water in the system and the return water of the heating system in sequence by heat exchange and heating the heat of the condenser drainage generated by the condenser and the heat of the heat exchange circulating water used for heat exchange in the condenser, so that the ultrafiltration device and the reverse osmosis device are both in the best effect, thereby ensuring the ultrafiltration effect and the reverse osmosis effect, and also enabling the soft water to be effectively preheated, reaching a stable preheating temperature before the steam turbine exhausts air to heat the soft water, thereby enabling the soft water to enter the boiler at a stable and high initial temperature, thereby improving the energy efficiency of the boiler and reducing the energy consumption of the boiler.

[0007] The technical solution adopted by the present invention is: The circulation system using condenser drainage includes a clarifier for connecting to an external water source, the clarifier is connected to a soft water tank for providing steam to drive the steam turbine and a cold water tower for providing heat exchange circulating water for the condenser, a clean water tank, a heat exchanger B, a primary filtration device, an ultrafiltration device, a reverse osmosis device and a desalination system are sequentially connected between the clarifier and the soft water tank, a boiler is connected between the soft water tank and the steam turbine, the steam turbine drives a generator, a low-pressure exhaust port of the steam turbine is sequentially connected to a siphon well and a condenser drainage tank through a condenser, the condenser drainage tank is respectively connected to the boiler and the heat exchanger B, and also includes a heat exchanger D and a hot water tank sequentially arranged along the flow direction of the heat return water along the heat return water of the heat supply circulation system, the hot water in the condenser drainage tank is heat exchanged by the heat exchanger B, and then heat exchanged by the heat exchanger D and connected to the soft water tank, and the refluxed heat return water is heated by the heat exchanger D and then enters the hot water tank for insulation.

[0008] A further improvement of the present invention is that a heat exchanger A is connected between the clean water tank and the boiler B, and the circulating water after heat exchange in the condenser is connected to a drainage well after heat exchange in the heat exchanger A in turn, and the drainage well discharges the water to an external water source.

[0009] A further improvement of the present invention is that a heat exchanger C is also connected to the heating return water pipe on the side of the heat exchanger D facing away from the hot water tank. The circulating water after heat exchange in the condenser successively passes through the heat exchanger A and then passes through the heat exchanger C for heat exchange again and is finally connected to the drainage well.

[0010] A further improvement of the present invention is that the circulating water after heat exchange in the heat exchanger C is also connected to the clean water tank.

[0011] 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 the clarification tank, the water outlet of the wastewater treatment system is connected to a drainage well, and the slag outlet of the wastewater treatment system is connected to a mud cake collection device.

[0012] A further improvement of the present invention is that the water outlet of the wastewater treatment system is also connected to a cooling water tower.

[0013] A further improvement of the present invention is that a pump F is provided between the neutralization tank and the wastewater treatment device, and a pump H is provided between the clarification tank and the wastewater treatment device.

[0014] A further improvement of the present invention is that the water inlet of the clarification tank is connected to the external water source through a pump A, a pump B is provided between the heat exchanger B and the primary filtration device, a pump C is provided between the soft water tank and the boiler, a pump D is provided between the cooling tower and the condenser, a pump E is provided between the condenser drainage tank and the boiler, a pump G is provided between the condenser drainage tank and the heat exchanger B, and the water outlet end of the hot water tank is connected to the heating water outlet pipe of the heating circulation system through a pump I.

[0015] A further improvement of the present invention is that the clarification tank is also connected to an industrial water tank.

[0016] A further improvement of the present invention is that the cooling water tower is connected to the industrial water tank via a pump D.

[0017] The beneficial effects of the present invention are: First, the circulation system utilizing condenser drainage of the present invention can make full use of the heat energy of the exhaust gas of the low-pressure cylinder of the turbine. The heat of the condenser drainage generated by the condenser and the heat of the heat exchange circulating water used for heat exchange in the condenser are used to heat and heat the water used for producing soft water in the system and the return water of the heating system in sequence, so that the ultrafiltration device and the reverse osmosis device are both in the best effect, thereby ensuring the ultrafiltration effect and the reverse osmosis effect, and can also effectively preheat the soft water to reach a stable preheating temperature before the steam turbine exhausts air to heat the soft water, so that the soft water can enter the boiler at a stable and high initial temperature, thereby improving the energy efficiency of the boiler and reducing the energy consumption of the boiler.

[0018] Secondly, in the circulation system utilizing condenser drainage of the present invention, the mud in the clarifier and the wastewater from the desalination system that has been neutralized are treated together by a wastewater treatment device to obtain a dry mud cake for easy collection and recovery. The water obtained after treatment can reach the quality of upper clear water in the clarifier, and thus enter a cooling tower or an industrial water tank for reuse. If the water obtained after treatment is really not needed, it can also be discharged to the water source through a drainage well. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of this application. DETAILED DESCRIPTION

[0020] like Figure 1 It can be seen that the circulation system using condenser drainage includes a clarifier 1 for connecting to an external water source, the clarifier 1 is connected to a soft water tank 8 for providing steam to drive the steam turbine 10 and a cooling water tower 3 for providing heat exchange circulating water for the condenser 12, the clarifier 1 and the soft water tank 8 are connected in sequence to a clean water tank 2, a heat exchanger B19, a primary filtration device 4, an ultrafiltration device 5, a reverse osmosis device 6 and a desalination system 7, the soft water tank 8 and the steam turbine 10 are connected to a boiler 9, the steam turbine 10 drives a generator 11, and the steam turbine The low-pressure exhaust port of 10 is connected with the siphon well 13 and the condenser drain tank 13 in sequence through the condenser 12. The condenser drain tank 13 is connected with the boiler 9 and the heat exchanger B19 respectively. It also includes a heat exchanger D21 and a hot water tank 32 arranged in sequence along the flow direction of the heat return water in the heat supply circulation system. The hot water in the condenser drain tank 14 is heat exchanged by the heat exchanger B19 and then by the heat exchanger D21, and is connected with the soft water tank 8. The refluxed heat return water is heated by the heat exchanger D21 and then enters the hot water tank 32 for insulation.

[0021] A heat exchanger A18 is also connected between the clean water tank 2 and the boiler B19. The circulating water after heat exchange in the condenser 11 is connected to the drainage well 17 after heat exchange in the heat exchanger A18. The drainage well 17 discharges the water to the external water source.

[0022] A heat exchanger C20 is also connected to the heating return water pipe on the side of the heat exchanger D21 facing away from the hot water tank 32. The circulating water after heat exchange in the condenser 11 passes through the heat exchanger A18 in turn, and then passes through the heat exchanger C20 again, and finally connects to the drainage well 17.

[0023] The circulating water after heat exchange in the heat exchanger C20 is also connected to the clean water tank 2.

[0024] The desalination system 7 is also connected to a neutralization tank 15, and the neutralization tank 15 is connected to a wastewater treatment system 16. The wastewater treatment system 16 is connected to the bottom of the clarification tank 1, and the outlet of the wastewater treatment system 16 is connected to a drainage well 17, and the slag outlet of the wastewater treatment system 16 is connected to a mud cake collection device.

[0025] The water outlet of the wastewater treatment system 16 is also connected to the cooling tower 3 .

[0026] A pump F28 is provided between the neutralization tank 15 and the wastewater treatment device 16 , and a pump H30 is provided between the clarification tank 1 and the wastewater treatment device 16 .

[0027] The position where the drainage well 17 discharges water to an external water source is located downstream of the position where the clarification tank 1 is connected to the external water source.

[0028] The water inlet of the clarification tank 1 is connected to the external water source through a pump A23, a pump B24 is provided between the heat exchanger B19 and the primary filtration device 4, a pump C25 is provided between the soft water tank 8 and the boiler 9, a pump D26 is provided between the cooling tower 3 and the condenser 12, a pump E27 is provided between the condenser drainage tank 14 and the boiler 9, a pump G29 is provided between the condenser drainage tank 14 and the heat exchanger B19, and the water outlet end of the hot water tank 32 is connected to the heating water outlet pipe of the heating circulation system through a pump I31.

[0029] The clarification tank 1 is also connected to an industrial water tank 22 .

[0030] The cooling water tower 3 is connected to the industrial water tank 22 via a pump D26.

[0031] When the present invention is used, the water in the cooling tower 3 exchanges heat with the low-pressure cylinder exhaust gas in the condenser 12 through the pump D26, so that the low-pressure exhaust gas condenses into water and then enters the condenser drainage tank through the siphon well for collection; the water in the condenser drainage tank 14 exchanges heat with the water in the clean water tank 2 before entering the primary filter device 4 through the heat exchanger B19, so that the water temperature of the water before ultrafiltration can reach and exceed 25 degrees Celsius, so that the water permeability of the ultrafiltration membrane of the ultrafiltration device 5 can reach a better state, ensuring the ultrafiltration efficiency, thereby saving water resources; after completing the heat exchange with the water entering the primary filter device 4 from the clean water tank 2, it continues to exchange heat with the water in the return water pipe of the heating circulation system through the heat exchanger D21, so that the return water temperature of the heating circulation system can be increased; complete The temperature of the soft water after heat exchange is now equivalent to the temperature of the soft water after being treated by the desalination system 7, thereby realizing the preliminary preheating of the soft water. Finally, the soft water enters the soft water tank 8 through the pipeline together with the soft water treated by the desalination system 7. The soft water in the soft water tank 8 is heated by the steam turbine exhaust heat exchange (the technology of heating the soft water by exhaust of the steam turbine in this application adopts the existing technology in the field, such as the specification and drawings of the patent No. 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 drawings), and the initial temperature of the soft water is further increased, and then 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.

[0032] The water in the cooling tower 3 exchanges heat with the low-pressure cylinder exhaust in the condenser 12 through the pump D26 to form heat exchange circulating water, so that the low-pressure exhaust condenses into water and enters the condenser drainage pool through the siphon well for collection; the heat exchange circulating water after the heat exchange with the low-pressure exhaust in the condenser 12 passes through the heat exchanger A18 to preheat the water before entering the heat exchanger B19, so that the temperature of the water entering the heat exchanger B19 is increased, and then the water temperature before ultrafiltration can reach a higher temperature, so that the temperature of the water passing through the ultrafiltration device 4 before entering the reverse osmosis device 6 can be at the optimal operating temperature of the reverse osmosis membrane (within the range of 25 to 30 degrees Celsius), thereby ensuring the efficiency and effect of the reverse osmosis device 6; after completing the heat exchange with the water entering the primary filter device 4 from the clean water tank 2, it continues to exchange heat with the water in the return water pipe of the heating circulation system through the heat exchanger C20, from And it can further increase the return water temperature of the heating circulation system, thereby reducing the energy consumption required for heating the heating return water recovered in the hot water tank 32 in the heating circulation system, and even eliminating the need to heat the heating return water separately; the temperature of the heat exchange circulating water after the heat exchange has dropped to slightly above normal temperature, and finally 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 provided to the clean water tank 2 by the clarification tank 1 is relatively small, the heat exchange circulating water after the heat exchange enters the clean water tank 2 through the pipeline to ensure the normal operation of the system, and after the heat exchange circulating water enters the clean water tank 2, the temperature in the clean water tank 2 can also be increased, which is beneficial to further increase the water temperature of the water 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 thermal energy of the heat exchange circulating water.

[0033] The clean water in the upper part of the clarifier 1 can enter the clean water tank 2, the cooling tower 3, and the industrial water tank 22 through pipelines according to the needs of the system; the water in the industrial water tank 22 can be used for industry or fire fighting. The sedimentation slurry at the bottom of the clarifier 1 enters the wastewater treatment system 16 for treatment through pump H30 and the water pumped out of the neutralization tank 15 through pump F28, thereby obtaining a filter-dried mud cake and relatively clear treated water. The dried mud cake is collected by a mud cake collection device, and the treated water enters the cooling tower 3 or the industrial water tank 22 through pipelines.

[0034] The heating circulating water in the hot water tank 32 is pumped out to the heating pipeline by the pump I31 for heating.

Claims

1. A circulation system utilizing condenser drainage, characterized in that: The invention comprises a clarifier (1) for connecting to an external water source, wherein the clarifier (1) is connected to a soft water tank (8) for providing steam for driving a steam turbine (10) and a cooling water tower (3) for providing heat exchange circulating water for a condenser (12), wherein a clean water tank (2), a heat exchanger B (19), a primary filtration device (4), an ultrafiltration device (5), a reverse osmosis device (6) and a desalination system (7) are sequentially connected between the clarifier (1) and the soft water tank (8), wherein a boiler (9) is connected between the soft water tank (8) and the steam turbine (10), wherein the steam turbine (10) drives a generator (11), and wherein the steam turbine (10) The low-pressure exhaust port is connected to the siphon well (13) and the condenser drain pool (13) in sequence through the condenser (12); the condenser drain pool (13) is connected to the boiler (9) and the heat exchanger B (19) respectively; the heat supply return water pipeline of the heat supply circulation system also includes a heat exchanger D (21) and a hot water tank (32) arranged in sequence along the flow direction of the heat supply return water; the hot water in the condenser drain pool (14) is heat exchanged in the heat exchanger B (19) and then heat exchanged in the heat exchanger D (21) and connected to the soft water tank (8); the return heat supply return water is heated by the heat exchanger D (21) and then enters the hot water tank (32) for heat preservation.

2. The circulation system using condenser drainage as claimed in claim 1, characterized in that: A heat exchanger A (18) is also provided between the clean water tank (2) and the steam generator B (19). The circulating water after heat exchange in the condenser (11) is then connected to the drainage well (17) after heat exchange in the heat exchanger A (18). The drainage well (17) discharges the water to an external water source.

3. The circulation system using condenser drainage as claimed in claim 2, characterized in that: A heat exchanger C (20) is also provided on the heating return water pipe on the side of the heat exchanger D (21) facing away from the hot water tank (32). The circulating water after heat exchange in the condenser (11) is successively subjected to heat exchange in the heat exchanger A (18) and then again subjected to heat exchange in the heat exchanger C (20) and finally connected to the drainage well (17).

4. The circulation system using condenser drainage as claimed in claim 3, characterized in that: The circulating water after heat exchange in the heat exchanger C (20) is also connected to the clean water tank (2).

5. The circulation system using condenser drainage as claimed in claim 2, characterized in that: The desalination system (7) is also connected to a neutralization tank (15), and the neutralization tank (15) is connected to a wastewater treatment system (16). The wastewater treatment system (16) is connected to the bottom of the clarification tank (1), and the water outlet of the wastewater treatment system (16) is connected to a drainage well (17), and the slag outlet of the wastewater treatment system (16) is connected to a mud cake collection device.

6. The circulation system using condenser drainage as claimed in claim 5, characterized in that: The water outlet of the wastewater treatment system (16) is also connected to the cooling water tower (3).

7. The circulation system using condenser drainage as claimed in claim 5 or 6, characterized in that: A pump F (28) is provided between the neutralization tank (15) and the wastewater treatment device (16), and a pump H (30) is provided between the clarification tank (1) and the wastewater treatment device (16).

8. The circulation system using condenser drainage as claimed in claim 1, characterized in that: The water inlet of the clarifier (1) is connected to an external water source via a pump A (23); a pump B (24) is provided between the heat exchanger B (19) and the primary filter device (4); a pump C (25) is provided between the soft water tank (8) and the boiler (9); a pump D (26) is provided between the cooling tower (3) and the condenser (12); a pump E (27) is provided between the condenser drain tank (14) and the boiler (9); a pump G (29) is provided between the condenser drain tank (14) and the heat exchanger B (19); and a water outlet of the hot water tank (32) is connected to a heat supply water outlet pipeline of a heat supply circulation system via a pump I (31).

9. The circulation system using condenser drainage as claimed in claim 1 or 8, characterized in that: The clarification tank (1) is also connected to an industrial water tank (22).

10. The circulation system using condenser drainage as claimed in claim 9, characterized in that: The cooling water tower (3) is connected to the industrial water tank (22) via a pump D (26).

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