CN116625153A - An indirect air-cooling unit circulating water waste heat recovery device and its use method - Google Patents

Abstract

The invention discloses an indirect air-cooling unit circulating water waste heat recovery device and a use method thereof, including a waste heat recovery component, and the waste heat recovery component includes a first recovery box, a first heat exchange tube, a second heat exchange tube, a delivery pump, a second heat exchange tube, and a second heat exchange tube. Two recovery tanks, a third heat exchange tube, a first electromagnetic valve, a second electromagnetic valve, a connecting tube and a temperature sensor; the first heat exchange tube is fixedly connected to the inside of the first recovery tank. The invention detects the water temperature of the circulating water through a temperature sensor, and when the temperature of the circulating water is still higher than the rated value after the heat exchange, the circulating water flows into the third heat exchange tube and exchanges heat again, thereby ensuring the cooling effect of the circulating water , the cooling water in the second recovery tank is drawn into the first recovery tank through the delivery pump, and finally the hot water after heat exchange flows into the boiler, thereby increasing the initial temperature of the water source in the boiler and reducing the heating time of the boiler to achieve saving Energy effect.

Description

An indirect air-cooling unit circulating water waste heat recovery device and its use method

Technical field:

The invention relates to a device and a use method, in particular to a waste heat recovery device and a use method of circulating water of an indirect air-cooling unit, and belongs to the technical field of waste heat recovery.

Background technique:

The steam turbine can decompress steam of different pressure levels, and at the same time use the power generated by the decompression process to drive the compressor. It is the main equipment of modern thermal power plants. The steam turbine will use an indirect air cooling unit when exhausting. When it works, the circulating water enters the water side of the surface condenser to exchange heat through the surface, and cools the exhaust steam of the steam turbine on the steam side of the condenser. The surface heat exchange is carried out, and the circulating water is cooled by the air and then returns to the condenser to cool the exhaust steam of the steam turbine, forming a closed cycle.

When the existing indirect air cooling unit cools the exhaust gas of the steam turbine through the circulating water, the temperature of the circulating water rises, and then the external air cooling tower is used to cool the circulating water. During the cooling process, the heat in the circulating water is dissipated to In the air, the heat in the circulating water cannot be recovered, which will cause waste of heat. Therefore, an indirect air-cooling unit circulating water waste heat recovery device and its use method are proposed.

Invention content:

The object of the present invention is to provide an indirect air-cooling unit circulating water waste heat recovery device and a method of use, so as to solve one of the problems raised in the above-mentioned background technology.

The present invention is implemented by the following technical scheme: a waste heat recovery device for circulating water of an indirect air-cooling unit, including a waste heat recovery component, and the waste heat recovery component includes a first recovery box, a first heat exchange tube, a second heat exchange tube, a delivery pump, The second recovery tank, the third heat exchange tube, the first electromagnetic valve, the second electromagnetic valve, the connecting pipe and the temperature sensor;

The first heat exchange tube is fixedly connected to the inside of the first recovery box, the second heat exchange tube and the third heat exchange tube are both fixedly connected to the inside of the second recovery box, and one end of the second heat exchange tube One end of the first heat exchange tube is fixedly connected and communicated with, the other end of the second heat exchange tube is fixedly connected with and communicated with the rear end of the connecting tube, and one end of the third heat exchange tube is fixedly connected and communicated with the connecting tube , the first electromagnetic valve is installed on the outer wall of the third heat exchange tube close to the side of the connecting pipe, the second electromagnetic valve and the temperature sensor are installed on the outer wall of the connecting pipe, and the drain of the second recovery tank passes through The pipeline communicates with the water inlet of the delivery pump.

As a further preference of this technical solution: the discharge port of the delivery pump communicates with the water inlet of the first recovery tank through a pipeline, the rear surface of the first recovery tank is equipped with a boiler water inlet pipe, and the water inlet of the second recovery tank is A cold water inlet pipe is installed on the rear surface.

As a further preference of this technical solution: the probe of the temperature sensor is inserted into the inside of the connecting pipe, the front end of the connecting pipe is fixedly connected with a circulating water outlet pipe, the other end of the third heat exchange pipe is connected to the circulating water outlet The tubes are firmly connected and connected.

As a further preference of this technical solution: the temperature sensor is located at the rear of the second solenoid valve, the connecting pipe is located at the front of the second recovery tank, and the end of the first heat exchange tube is far away from the second heat exchange tube Located on the outside of the first recycling bin.

As a further preference of this technical solution: a stirring assembly is installed inside the first recovery box, and the stirring assembly includes two driving motors, a stirring plate and two rotating shafts;

The lower surfaces of the two rotating shafts are respectively rotatably connected to the inner bottom wall of the first recovery box and the inner bottom wall of the second recovery box.

As a further preferred solution of this technical solution: the two driving motors are respectively installed on the lower surface of the first recycling box and the lower surface of the second recycling box, and the lower surface of the rotating shaft is fixedly connected to the output shaft of the driving motor.

As a further preference of this technical solution: the agitating plate is symmetrically fixedly connected to the outer wall of the rotating shaft, and the two rotating shafts are respectively located under the first heat exchange tube and the third heat exchange tube, and the third heat exchange tube Located below the second heat exchange tube, a controller is installed on the front surface of the first recovery tank.

In addition, the present invention also provides a method for using an indirect air-cooling unit circulating water waste heat recovery device, including the following steps:

Step 1: Connect the end of the first heat exchange tube away from the second heat exchange tube to the circulating water drain pipe of the indirect air-cooling unit, and the circulating water to be cooled flows into the first heat exchange tube;

Step 2: At this time, the cooling water in the first recovery tank exchanges heat with the circulating water through the first heat exchange tube, and the circulated water after heat exchange flows into the second heat exchange tube;

Step 3: The cooling water in the second recovery tank exchanges heat again for the residual heat of the circulating water in the second heat exchange pipe, and the heat exchanged circulating water flows into the connecting pipe;

Step 4: Use a temperature sensor to detect the temperature of the circulating water after heat exchange. After the temperature is qualified, the circulating water in the second heat exchange tube is directly discharged through the connecting pipe and the circulating water outlet pipe;

Step 5: When the temperature of the circulating water after the two heat exchanges is still higher than the rated value, the controller controls the second solenoid valve to close and the first solenoid valve to open, at this time the circulating water flows into the third heat exchange tube;

Step 6: Use the cooling water in the second recovery tank to exchange heat again for the circulating water, and the circulating water after heat exchange is discharged through the circulating water outlet pipe. At this time, the temperature of the cooling water in the second recovery tank is lower than that of the first recovery tank The temperature of the internal cooling water;

Step 7: Pump the water source in the second recovery tank into the first recovery tank through the delivery pump to circulate the cooling water;

Step 8: The hot water after heat exchange in the first recovery tank flows into the boiler through the boiler inlet pipe.

As a further preferred solution of this technical solution: in the first step, when the cooling water in the first recovery tank is exchanging heat, the driving motor drives the stirring plate through the rotating shaft to stir the cooling water in the first recovery tank.

As a further preference of this technical solution: in the step 3 and step 6, when the cooling water in the second recovery tank is exchanging heat, the driving motor drives the stirring plate through the rotating shaft to carry out the cooling water in the second recovery tank. agitation.

Advantages of the present invention: the present invention exchanges heat with the circulating water through the first heat exchange tube and the second heat exchange tube, and detects the water temperature of the circulating water through the temperature sensor. After the heat exchange, the temperature of the circulating water is still higher than the rated value At this time, the second solenoid valve is closed and the first solenoid valve is opened. At this time, the circulating water flows into the third heat exchange tube and exchanges heat again, thereby ensuring the cooling effect of the circulating water. The cooling water in the second recovery tank is pumped through the delivery pump. Flowing into the first recovery tank can increase the utilization efficiency of cooling water, and finally the hot water after heat exchange flows into the boiler, thereby increasing the initial temperature of the water source in the boiler and reducing the heating time of the boiler to achieve the effect of energy saving.

Description of drawings:

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the connection between the first heat exchange tube and the second heat exchange tube of the present invention;

Fig. 3 is a schematic diagram of the connection between the third heat exchange tube and the connecting tube of the present invention;

Fig. 4 is a schematic diagram of the installation position of the stirring plate of the present invention;

Fig. 5 is a schematic structural view of the stirring assembly of the present invention;

Fig. 6 is a schematic structural diagram of the waste heat recovery component of the present invention.

In the figure: 101, waste heat recovery component; 11, first recovery box; 12, first heat exchange tube; 13, second heat exchange tube; 14, delivery pump; 16, second recovery box; 17, third heat exchange 18, the first solenoid valve; 19, the second solenoid valve; 20, the connecting pipe; 21, the circulating water outlet pipe; 22, the temperature sensor; 23, the cold water inlet pipe; 24, the boiler inlet pipe; 301, the agitation assembly; 31, driving motor; 32, stirring plate; 33, rotating shaft; 34, controller.

Detailed ways:

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example

Please refer to Figures 1-6, the present invention provides a technical solution: a waste heat recovery device for circulating water of an indirect air-cooled unit, including a waste heat recovery component 101, and the waste heat recovery component 101 includes a first recovery tank 11, a first heat exchange tube 12, The second heat exchange pipe 13, the transfer pump 14, the second recovery tank 16, the third heat exchange pipe 17, the first solenoid valve 18, the second solenoid valve 19, the connecting pipe 20 and the temperature sensor 22;

The first heat exchange tube 12 is fixedly connected to the inside of the first recovery box 11, the second heat exchange tube 13 and the third heat exchange tube 17 are all fixedly connected to the inside of the second recovery box 16, and one end of the second heat exchange tube 13 One end of the first heat exchange tube 12 is fixedly connected and communicated, the other end of the second heat exchange tube 13 is fixedly connected and communicated with the rear end of the connecting tube 20, and one end of the third heat exchange tube 17 is fixedly connected and communicated with the connecting tube 20. connected, the first solenoid valve 18 is installed on the side of the third heat exchange tube 17 outer wall close to the connecting pipe 20, the second solenoid valve 19 and the temperature sensor 22 are installed on the outer side wall of the connecting pipe 20, and the drain of the second recovery tank 16 The mouth is communicated with the water inlet of delivery pump 14 by pipeline.

In this embodiment, specifically: the discharge port of the delivery pump 14 communicates with the water inlet of the first recovery tank 11 through a pipeline, the rear surface of the first recovery tank 11 is equipped with a boiler water inlet pipe 24, and the rear surface of the second recovery tank 16 The cold water inlet pipe 23 is installed, and then the cooling water after heat exchange can be delivered to the boiler through the boiler water inlet pipe 24, so as to increase the initial temperature of the water source in the boiler, reduce the heating time of the boiler, and then achieve the effect of saving energy.

In this embodiment, specifically: the probe of the temperature sensor 22 is inserted into the inside of the connecting pipe 20, the front end of the connecting pipe 20 is fixedly connected with the circulating water outlet pipe 21, and the other end of the third heat exchange pipe 17 is connected to the circulating water outlet pipe 21. Fixedly connected and connected, the temperature sensor 22 is located at the rear of the second solenoid valve 19, the connecting pipe 20 is located at the front of the second recovery tank 16, and the end of the first heat exchange tube 12 away from the second heat exchange tube 13 is located at the first recovery Outside the tank 11, the temperature sensor 22 can further monitor the discharge temperature of the circulating water in the second heat exchange tube 13, so as to achieve the effect of temperature control.

In this embodiment, specifically: a stirring assembly 301 is installed inside the first recovery box 11, and the stirring assembly 301 includes two driving motors 31, a stirring plate 32 and two rotating shafts 33;

The lower surfaces of the two rotating shafts 33 are respectively rotatably connected to the inner bottom wall of the first recovery box 11 and the inner bottom wall of the second recovery box 16, and the two drive motors 31 are installed on the lower surface of the first recovery box 11 and the second recovery box 16 respectively. The lower surface of the recovery box 16, the lower surface of the rotating shaft 33 is fixedly connected to the output shaft of the drive motor 31, the stirring plate 32 is symmetrically fixedly connected to the outer sidewall of the rotating shaft 33, and the two rotating shafts 33 are located at the first heat exchange tube 12 and the third heat exchange tube respectively. Below the heat exchange tube 17, the third heat exchange tube 17 is positioned at the bottom of the second heat exchange tube 13, the driving motor 31 drives the rotating shaft 33, and the rotating shaft 33 drives the stirring plate 32, and the first recovery box 11 and the second recovery box 11 can be adjusted by the stirring plate 32. The cooling water in the second recovery tank 16 is stirred so that the cooling water fully contacts with the three heat exchange tubes.

In this embodiment, specifically: a controller 34 is installed on the front surface of the first recovery box 11, and the electrical output end of the controller 34 is respectively connected to the first solenoid valve 18, the second solenoid valve 19, the temperature sensor 22, the The electrical input end of the delivery pump 14 and the driving motor 31 is electrically connected, and the electrical input end of the controller 34 is connected to an external power source for the first electromagnetic valve 18, the second electromagnetic valve 19, the temperature sensor 22, and the delivery pump 14. Powered by the driving motor 31 , the signal output end of the temperature sensor 22 is connected with the signal input end of the controller 34 .

In addition, the present invention also provides a method for using an indirect air-cooling unit circulating water waste heat recovery device, including the following steps:

Step 1: Connect the end of the first heat exchange tube 12 away from the second heat exchange tube 13 to the circulating water drain pipe of the indirect air cooling unit, and the circulating water to be cooled flows into the first heat exchange tube 12;

Step 2: At this time, the cooling water in the first recovery tank 11 exchanges heat with the circulating water through the first heat exchange pipe 12, and the heat exchanged circulating water flows into the second heat exchange pipe 13;

Step 3: The cooling water in the second recovery tank 16 performs heat exchange again on the remaining waste heat of the circulating water in the second heat exchange pipe 13, and the heat exchanged circulating water flows into the connecting pipe 20;

Step 4: Use the temperature sensor 22 to detect the water temperature of the circulating water after heat exchange. After the temperature is qualified, the circulating water in the second heat exchange pipe 13 is directly discharged through the connecting pipe 20 and the circulating water outlet pipe 21;

Step 5: When the temperature of the circulating water after two heat exchanges is still higher than the rated value, the controller 34 controls the second solenoid valve 19 to close and the first solenoid valve 18 to open, at this time the circulating water flows into the third heat exchange tube 17;

Step 6: The circulating water is exchanged again through the cooling water in the second recovery tank 16, and the circulating water after the heat exchange is discharged through the circulating water outlet pipe 21. At this time, the temperature of the cooling water in the second recovery tank 16 is lower than that of the first recovery tank 16. The temperature of the cooling water in the recovery box 11;

Step 7: The water source in the second recovery tank 16 is drawn into the first recovery tank 11 through the transfer pump 14 to circulate the cooling water;

Step 8: The hot water after heat exchange in the first recovery tank 11 flows into the boiler through the boiler inlet pipe 24 .

In this embodiment, specifically: in step one, when the cooling water in the first recovery tank 11 is exchanging heat, the driving motor 31 drives the stirring plate 32 through the rotating shaft 33 to stir the cooling water in the first recovery tank 11 , in step 3 and step 6, when the cooling water in the second recovery tank 16 is exchanging heat, the driving motor 31 drives the stirring plate 32 through the rotating shaft 33 to stir the cooling water in the second recovery tank 16, and then can make The cooling water fully contacts the first heat exchange tube 12 , the second heat exchange tube 13 and the third heat exchange tube 17 to increase the heat exchange effect.

In the present invention, the model of the temperature sensor 22 is: WZPB-230, and the model of the controller 34 is: OHR-PR10.

Working principle or structural principle, when in use, the end of the first heat exchange tube 12 away from the second heat exchange tube 13 is connected to the circulating water drain pipe of the indirect air cooling unit, and the circulating water to be cooled flows into the first heat exchange tube 12 At this time, the cooling water in the first recovery tank 11 exchanges heat with the circulating water through the first heat exchange tube 12, and the circulating water after heat exchange flows into the second heat exchange tube 13, and the cooling water in the second recovery tank 16 is The remaining waste heat of the circulating water in the second heat exchange pipe 13 performs heat exchange again, and the circulating water after heat exchange flows into the connecting pipe 20, and the water temperature of the circulating water after heat exchange is detected by the temperature sensor 22. After the temperature is qualified, The circulating water in the second heat exchange pipe 13 is directly discharged through the connecting pipe 20 and the circulating water outlet pipe 21. When the temperature of the circulating water after two heat exchanges is still higher than the rated value, the controller 34 controls the second solenoid valve 19 Closed, the first solenoid valve 18 is opened, at this time, the circulating water flows into the third heat exchange pipe 17, and the circulating water is exchanged again through the cooling water in the second recovery tank 16, and the circulating water after heat exchange passes through the circulating water outlet Pipe 21 is discharged, and the temperature of the cooling water in the second recovery tank 16 is lower than the temperature of the cooling water in the first recovery tank 11 at this moment, and the water source in the second recovery tank 16 is drawn into the first recovery tank 11 by delivery pump 14, and Through the cold water inlet pipe 23, cooling water can be input into the second recovery tank 16 to circulate the cooling water, and the hot water after heat exchange in the first recovery tank 11 flows into the boiler through the boiler water inlet tube 24, thereby increasing the water source in the boiler The initial temperature of the boiler reduces the heating time of the boiler to achieve the effect of saving energy.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. The circulating water waste heat recovery device of the indirect air cooling unit is characterized by comprising a waste heat recovery assembly (101), wherein the waste heat recovery assembly (101) comprises a first recovery tank (11), a first heat exchange tube (12), a second heat exchange tube (13), a conveying pump (14), a second recovery tank (16), a third heat exchange tube (17), a first electromagnetic valve (18), a second electromagnetic valve (19), a connecting tube (20) and a temperature sensor (22);

the utility model discloses a heat pump, including first heat exchange tube (12), second heat exchange tube (13), third heat exchange tube (17), first heat exchange tube (12) fixed connection is in the inside of first recovery case (11), second heat exchange tube (13) and third heat exchange tube (17) are all fixed connection in the inside of second recovery case (16), the one end of second heat exchange tube (13) and the one end fixed connection and the intercommunication of first heat exchange tube (12), the other end of second heat exchange tube (13) and the rear end fixed connection and the intercommunication of connecting pipe (20), the one end and the connecting pipe (20) fixed connection and the intercommunication of third heat exchange tube (17), first solenoid valve (18) are installed in one side that third heat exchange tube (17) outer wall is close to connecting pipe (20), second solenoid valve (19) and temperature sensor (22) are all installed in the lateral wall of connecting pipe (20), the outlet of second recovery case (16) is through pipeline and the water inlet intercommunication of delivery pump (14).

2. The circulating water waste heat recovery device of an indirect air cooling unit according to claim 1, wherein a water outlet of the conveying pump (14) is communicated with a water inlet of a first recovery tank (11) through a pipeline, a boiler water inlet pipe (24) is arranged on the rear surface of the first recovery tank (11), and a cold water inlet pipe (23) is arranged on the rear surface of the second recovery tank (16).

3. The circulating water waste heat recovery device of the indirect air cooling unit according to claim 1, wherein a probe of the temperature sensor (22) is inserted into the connecting pipe (20), a circulating water outlet pipe (21) is fixedly connected to the front end of the connecting pipe (20), and the other end of the third heat exchange pipe (17) is fixedly connected and connected with the circulating water outlet pipe (21).

4. A circulating water waste heat recovery device of an indirect air cooling unit according to claim 3, wherein the temperature sensor (22) is located at the rear part of the second electromagnetic valve (19), the connecting pipe (20) is located at the front part of the second recovery tank (16), and one end of the first heat exchange pipe (12) far away from the second heat exchange pipe (13) is located outside the first recovery tank (11).

5. The circulating water waste heat recovery device of an indirect air cooling unit according to claim 4, wherein an agitating assembly (301) is installed in the first recovery tank (11), and the agitating assembly (301) comprises two driving motors (31), an agitating plate (32) and two rotating shafts (33);

the lower surfaces of the two rotating shafts (33) are respectively connected with the inner bottom wall of the first recovery box (11) and the inner bottom wall of the second recovery box (16) in a rotating mode.

6. The circulating water waste heat recovery device of an indirect air cooling unit according to claim 5, wherein the two driving motors (31) are respectively installed on the lower surface of the first recovery tank (11) and the lower surface of the second recovery tank (16), and the lower surface of the rotating shaft (33) is fixedly connected to an output shaft of the driving motor (31).

7. The circulating water waste heat recovery device of an indirect air cooling unit according to claim 5, wherein the stirring plates (32) are symmetrically and fixedly connected to the outer side walls of the rotating shafts (33), two rotating shafts (33) are respectively positioned below the first heat exchange tube (12) and the third heat exchange tube (17), the third heat exchange tube (17) is positioned below the second heat exchange tube (13), and a controller (34) is arranged on the front surface of the first recovery box (11).

8. The method for using the circulating water waste heat recovery device of the indirect air cooling unit according to any one of claims 1 to 7, comprising the following steps:

step one: one end of the first heat exchange tube (12) far away from the second heat exchange tube (13) is communicated with a circulating water drain pipe of the indirect air cooling unit, and circulating water to be cooled flows into the first heat exchange tube (12);

step two: at the moment, the cooling water of the first recovery tank (11) exchanges heat with the circulating water through the first heat exchange tube (12), and the circulating water after heat exchange flows into the second heat exchange tube (13);

step three: the cooling water in the second recovery tank (16) exchanges heat again with the residual heat of the circulating water in the second heat exchange tube (13), and the circulating water after heat exchange flows into the connecting tube (20);

step four: the temperature of the circulating water after heat exchange is detected by a temperature sensor (22), and after the temperature is qualified, the circulating water in the second heat exchange tube (13) is directly discharged through a connecting tube (20) and a circulating water outlet tube (21);

step five: when the temperature of the circulating water after the twice heat exchange is still higher than the rated value, the controller (34) controls the second electromagnetic valve (19) to be closed and the first electromagnetic valve (18) to be opened, and at the moment, the circulating water flows into the third heat exchange tube (17);

step six: the circulating water is subjected to heat exchange again through the cooling water in the second recovery tank (16), the circulating water after heat exchange is discharged through a circulating water outlet pipe (21), and at the moment, the temperature of the cooling water in the second recovery tank (16) is lower than that of the cooling water in the first recovery tank (11);

step seven: the water source in the second recovery tank (16) is pumped by the delivery pump (14) to flow into the first recovery tank (11), so that cooling water is circulated;

step eight: the hot water after heat exchange in the first recovery tank (11) flows into the boiler through a boiler water inlet pipe (24).

9. The method according to claim 8, wherein in the first step, the driving motor (31) drives the stirring plate (32) to stir the cooling water in the first recovery tank (11) through the rotating shaft (33) when the cooling water in the first recovery tank (11) exchanges heat.

10. The method according to claim 8, wherein in the third and sixth steps, the cooling water in the second recovery tank (16) is stirred by the stirring plate (32) driven by the driving motor (31) through the rotating shaft (33) when the cooling water in the second recovery tank (16) exchanges heat.