CN216431866U - Back pressure unit steam power plant external supply steam condensate return water waste heat recovery system - Google Patents
Back pressure unit steam power plant external supply steam condensate return water waste heat recovery system Download PDFInfo
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- CN216431866U CN216431866U CN202120279146.XU CN202120279146U CN216431866U CN 216431866 U CN216431866 U CN 216431866U CN 202120279146 U CN202120279146 U CN 202120279146U CN 216431866 U CN216431866 U CN 216431866U
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Abstract
A back pressure unit thermal power plant external supply steam condensate return water waste heat recovery system comprises a raw water heater, a return water heat exchanger, a boiler make-up water treatment system, an external supply steam condensate return water treatment system and a demineralized water tank; the raw water heater comprises a steam condensate water inlet, a steam condensate water outlet, a boiler make-up water inlet and a boiler make-up water outlet; the backwater heat exchanger comprises a high-temperature backwater water inlet, a low-temperature backwater water outlet, a demineralized water inlet and a demineralized water outlet; all the devices are connected through pipelines. The utility model simultaneously realizes the heating of raw water and desalted water and the cooling of externally supplied steam condensate, reduces energy consumption and ensures the safe and efficient operation of equipment.
Description
Technical Field
The utility model belongs to the field of backwater utilization, and particularly relates to a backwater waste heat recovery system for externally-supplied steam condensate of a thermal power plant of a backpressure unit.
Background
The return water temperature of the condensed water of the externally supplied steam of the power plant is higher, generally at 70-95 ℃, the water quality is better, and comprehensive recycling is needed. When the water temperature exceeds the tolerance temperature of the treatment facility or the water temperature acceptable by a recycling system, a temperature reduction measure is required. Particularly, when the external steam supply condensed water backwater treatment process adopts an ion exchange method, the temperature of the backwater cannot exceed the tolerance value of the anion-cation resin. The temperature of the produced backwater is generally controlled to be lower than 60 ℃. This requires cooling measures to be taken when the return water temperature exceeds the standard.
The boiler make-up water treatment system generally adopts a full-membrane method-ultrafiltration + reverse osmosis + electric desalting/ion exchange process, and the water temperature can be as low as 0-5 ℃ in winter and spring. The lower water temperature can reduce the filter holes of ultrafiltration and reverse osmosis membranes, reduce the membrane flux, increase the discharge amount of wastewater, cause the pressure rise of equipment and influence the service life of the equipment, so the influence of low-temperature operation must be considered during the system design. In engineering practice, the water inlet temperature of the ultrafiltration device is generally controlled to be 10-40 ℃, and the water inlet temperature of the reverse osmosis device is generally controlled to be 20-25 ℃. Therefore, when the air temperature is low, the incoming water of the boiler makeup water treatment system must be heated. At present, a boiler make-up water treatment system generally adopts a steam or electric heating mode to heat raw water.
The water temperature problem of the boiler make-up water treatment system raw water and demineralized water heating and external steam supply condensed water return water treatment system is solved, and the necessary measures for realizing energy saving and consumption reduction of the operation of the thermal power plant of the back pressure unit are realized.
SUMMERY OF THE UTILITY MODEL
The utility model solves the technical problem of water temperature of a boiler make-up water treatment system raw water and demineralized water heating and external steam supply condensed water return water treatment system.
The technical means adopted by the utility model are as follows.
A back pressure unit thermal power plant external supply steam condensate return water waste heat recovery system at least comprises a raw water heater, a boiler make-up water treatment system, an external supply steam condensate return water treatment system and a demineralized water tank; the raw water heater comprises a steam condensate water inlet, a steam condensate water outlet, a boiler make-up water inlet and a boiler make-up water outlet; the steam condensate water inlet is connected with an external steam condensate water return pipe, the steam condensate water outlet is connected with the external steam condensate water return processing system through an external steam condensate water supply pipe, the boiler make-up water inlet is connected with a boiler make-up water supply pipe, and the boiler make-up water outlet is connected with the boiler make-up water processing system through a boiler make-up water supply pipe; the boiler make-up water treatment system is connected with a demineralized water tank through a demineralized water inlet pipe; the external steam supply condensed water backwater treatment system is connected with the demineralized water tank through a demineralized water inlet pipe.
The system further comprises a return water heat exchanger, wherein the return water heat exchanger comprises a high-temperature return water inlet, a low-temperature return water outlet, a demineralized water inlet and a demineralized water outlet; the high-temperature backwater water inlet is connected with an external steam condensate water supply backwater pipe, the low-temperature backwater water outlet is connected with the external steam condensate water supply backwater treatment system through an external steam condensate water supply pipe, the demineralized water inlet is connected with the demineralized water tank through a demineralized water supply pipe, and the demineralized water outlet is connected with a demineralized water pipe connected with a main factory building; the demineralized water delivery pipe is provided with a demineralized water pump.
Furthermore, a heater water inlet valve and a heat exchanger water inlet valve are arranged on the external steam supply condensed water return pipe; and a heater water outlet valve and a heat exchanger water outlet valve are arranged on the external steam supply condensed water delivery pipe.
Further, the raw water heater is a shell-and-tube heat exchanger or a plate heat exchanger.
Further, the water return heat exchanger is a shell-and-tube heat exchanger or a plate heat exchanger.
The technical effects produced by the present invention are as follows.
1. When the temperature is low, the return water of the externally supplied steam condensate water is used as a heat source of the raw water heater and the return water heat exchanger, and the raw water and the desalted water of the boiler feedwater treatment system are heated while the return water of the externally supplied steam condensate water is cooled.
2. When the temperature is high, the demineralized water is used as a cold source for returning the externally supplied steam condensate, and the demineralized water is heated while the externally supplied steam condensate is cooled.
3. When the temperature is low, the return water of the condensed water of the externally supplied steam with relatively high temperature is utilized to heat the raw water and the desalted water, so that the raw water heater is prevented from consuming electric energy or steam, and the energy is saved.
4. When the temperature is high, the heat exchange between the desalted water and the return water of the condensed water of the externally supplied steam is utilized, the desalted water is heated, and the return water of the condensed water is cooled, so that the energy is saved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Description of the figure numbers: the system comprises a raw water heater 1, a backwater heat exchanger 2, a boiler make-up water treatment system 3, an external steam supply condensed water backwater treatment system 4, a demineralized water tank 5, a demineralized water pump 6, an external steam supply condensed water backwater pipe 7, an external steam supply condensed water feed pipe 8, a boiler make-up water inlet pipe 9, a boiler make-up water feed pipe 10, a demineralized water inlet pipe 15, a demineralized water feed pipe 16, a main plant demineralized water pipe 17, a steam condensed water inlet 11, a steam condensed water outlet 12, a boiler make-up water inlet 13, a boiler make-up water outlet 14, a high-temperature backwater water inlet 21, a low-temperature backwater water outlet 22, a demineralized water inlet 23, a demineralized water outlet 24, a heater water inlet valve 110, a heat exchanger water inlet valve 210, a heater water outlet valve 120 and a heat exchanger water outlet valve 220.
Detailed Description
As shown in figure 1, the external steam condensate return water waste heat recovery system of the back pressure unit thermal power plant comprises a raw water heater 1, a return water heat exchanger 2, a boiler make-up water treatment system 3, an external steam condensate return water treatment system 4, a demineralized water tank 5 and a demineralized water pump 6.
The raw water heater 1 is a shell-and-tube heat exchanger or a plate heat exchanger, and the raw water heater 1 comprises a steam condensate water inlet 11, a steam condensate water outlet 12, a boiler make-up water inlet 13 and a boiler make-up water outlet 14; the steam condensate water inlet 11 is connected with an external steam condensate water return pipe 7, the steam condensate water outlet 12 is connected with the external steam condensate water return processing system 4 through an external steam condensate water supply pipe 8, the boiler make-up water inlet 13 is connected with a boiler make-up water supply pipe 9, and the boiler make-up water outlet 14 is connected with the boiler make-up water processing system 3 through a boiler make-up water supply pipe 10; the boiler make-up water treatment system 3 is connected with a demineralized water tank 5 through a demineralized water inlet pipe 15; the external steam supply condensed water backwater treatment system 4 is connected with the demineralized water tank 5 through a demineralized water inlet pipe 15.
The backwater heat exchanger 2 is a shell-and-tube heat exchanger or a plate heat exchanger, and the backwater heat exchanger 2 comprises a high-temperature backwater water inlet 21, a low-temperature backwater water outlet 22, a demineralized water inlet 23 and a demineralized water outlet 24; the high-temperature backwater water inlet 21 is connected with the outside steam condensate return pipe 7, the low-temperature backwater water outlet 22 is connected with the outside steam condensate backwater treatment system 4 through the outside steam condensate water supply pipe 8, the demineralized water inlet 23 is connected with the demineralized water tank 5 through the demineralized water supply pipe 16, and the demineralized water outlet 24 is connected with the demineralized water pipe 17 of the main workshop; the demineralized water feed pipe 16 is provided with a demineralized water pump 6.
A heater water inlet valve 110 and a heat exchanger water inlet valve 210 are arranged on the external steam supply condensed water return pipe 7; the water supply pipe 8 for the condensed water of the external steam supply is provided with a water outlet valve 120 of the heater and a water outlet valve 220 of the heat exchanger.
The furnace feed water treatment system 3 mainly comprises an ultrafiltration device, a reverse osmosis device, an electrodeionization device or an ion exchanger. The external steam supply condensed water backwater treatment system 4 mainly comprises an iron removal filter and an ion exchanger, and the inside of the system is filled with cation resin or mixed resin of the cation resin and anion resin.
When the temperature is low, the heater inlet valve 110 and the heater outlet valve 120 are opened, the heat exchanger inlet valve 210 and the heat exchanger outlet valve 220 are closed, high-temperature external steam supply condensed water enters the raw water heater 1 through the external steam supply condensed water return pipe 7, heat exchange is carried out with the raw water of the low-temperature boiler make-up water, the raw water of the boiler make-up water enters the boiler make-up water treatment system 3 for treatment after being heated to 25 ℃, the treated boiler make-up water enters the demineralized water tank 5 for storage through the demineralized water inlet pipe 15, the treated external steam supply condensed water enters the external steam supply condensed water return treatment system 4 through the external steam supply condensed water delivery pipe 8 for treatment after the temperature of the high-temperature external steam supply condensed water is reduced to be below 60 ℃, and the treated external steam supply condensed water enters the demineralized water tank 5 for storage through the demineralized water inlet pipe 15. When the temperature of the water discharged from the steam condensate water outlet 12 exceeds 60 ℃ or the temperature of the water discharged from the boiler makeup water outlet 14 exceeds 25 ℃, the heat exchanger water inlet valve 210 and the heat exchanger water outlet valve 220 are opened, the demineralized water in the demineralized water tank 5 is transported to the backwater heat exchanger 2 through the demineralized water delivery pipe 16 by the demineralized water pump 6, the high-temperature external steam condensate enters the backwater heat exchanger 2 through the external steam condensate water return pipe 7 and exchanges heat with the low-temperature demineralized water, the heated demineralized water is transported to the main plant through the demineralized water delivery pipe 17 of the main plant, the high-temperature external steam condensate is cooled to below 60 ℃ and then enters the external steam condensate backwater treatment system 4 through the external steam condensate water delivery pipe 8 for treatment, and the treated external steam condensate enters the demineralized water tank 5 through the demineralized water inlet pipe 15 for storage. The temperature of the heated boiler supply water is ensured to be not more than 25 ℃ by utilizing demineralized water, and meanwhile, the water inlet temperature of the external steam supply condensed water backwater treatment system 4 is not more than 60 ℃.
When the temperature is high, the heat exchanger water inlet valve 210 and the heat exchanger water outlet valve 220 are opened, the heater water inlet valve 110 and the heater water outlet valve 120 are closed, the high-temperature externally-supplied steam condensate exchanges heat with the demineralized water, the externally-supplied steam condensate enters the externally-supplied steam condensate backwater treatment system 4 for treatment after being cooled to below 60 ℃, and the treated externally-supplied steam condensate enters the demineralized water tank 5 through the demineralized water inlet pipe 15 for storage.
Claims (5)
1. The recovery system for the backwater waste heat of the externally supplied steam condensate of the thermal power plant of the backpressure unit is characterized by at least comprising a raw water heater (1), a boiler make-up water treatment system (3), an externally supplied steam condensate backwater treatment system (4) and a demineralized water tank (5); the raw water heater (1) comprises a steam condensate water inlet (11), a steam condensate water outlet (12), a boiler make-up water inlet (13) and a boiler make-up water outlet (14); the steam condensate water inlet (11) is connected with an external steam condensate water supply return pipe (7), the steam condensate water outlet (12) is connected with the external steam condensate water supply return water treatment system (4) through an external steam condensate water supply pipe (8), the boiler make-up water inlet (13) is connected with a boiler make-up water supply pipe (9), and the boiler make-up water outlet (14) is connected with the boiler make-up water treatment system (3) through a boiler make-up water supply pipe (10); the boiler make-up water treatment system (3) is connected with a demineralized water tank (5) through a demineralized water inlet pipe (15); the external steam supply condensed water backwater treatment system (4) is connected with the demineralized water tank (5) through a demineralized water inlet pipe (15).
2. The recovery system of the backwater waste heat of the condensed water of the externally supplied steam of the thermal power plant of the back pressure unit as claimed in claim 1, further comprising a backwater heat exchanger (2), wherein the backwater heat exchanger (2) comprises a high-temperature backwater water inlet (21), a low-temperature backwater water outlet (22), a demineralized water inlet (23) and a demineralized water outlet (24); the high-temperature backwater water inlet (21) is connected with an external steam supply condensate water backwater pipe (7), the low-temperature backwater water outlet (22) is connected with the external steam supply condensate water backwater treatment system (4) through an external steam supply condensate water delivery pipe (8), the demineralized water inlet (23) is connected with the demineralized water tank (5) through a demineralized water delivery pipe (16), and the demineralized water outlet (24) is connected with a demineralized water pipe (17) of a main workshop; the demineralized water delivery pipe (16) is provided with a demineralized water pump (6).
3. The recovery system for the waste heat of the return water of the condensed water of the externally supplied steam of the thermal power plant of the back pressure unit as claimed in claim 2, wherein the return pipe (7) of the condensed water of the externally supplied steam is provided with a heater inlet valve (110) and a heat exchanger inlet valve (210); and a heater water outlet valve (120) and a heat exchanger water outlet valve (220) are arranged on the external steam supply condensed water delivery pipe (8).
4. The system for recovering the condensate return water waste heat of the externally supplied steam of the back pressure unit thermal power plant as claimed in claim 1, wherein the raw water heater (1) is a shell-and-tube heat exchanger or a plate heat exchanger.
5. The recovery system for the condensate return water waste heat of the externally supplied steam of the back pressure unit thermal power plant as claimed in claim 2, characterized in that the return water heat exchanger (2) is a shell-and-tube heat exchanger or a plate heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120279146.XU CN216431866U (en) | 2021-02-01 | 2021-02-01 | Back pressure unit steam power plant external supply steam condensate return water waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120279146.XU CN216431866U (en) | 2021-02-01 | 2021-02-01 | Back pressure unit steam power plant external supply steam condensate return water waste heat recovery system |
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| CN216431866U true CN216431866U (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120279146.XU Active CN216431866U (en) | 2021-02-01 | 2021-02-01 | Back pressure unit steam power plant external supply steam condensate return water waste heat recovery system |
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| CN (1) | CN216431866U (en) |
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2021
- 2021-02-01 CN CN202120279146.XU patent/CN216431866U/en active Active
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