Power generation tail gas waste heat utilization device for thermal power plant

Abstract

The utility model relates to the technical field of waste heat utilization, and discloses a thermal power plant power generation tail gas waste heat utilization device which comprises a water tank, a tail gas pipe is installed on one side of the water tank, a first connecting pipe is installed on the inner wall of the water tank and corresponds to the tail gas pipe in position, and a heat conduction plate is installed on the side, away from the tail gas pipe, of the first connecting pipe. The heat conducting plate is arranged in a wave shape, a second connecting pipe is installed on the side, away from the first connecting pipe, of the heat conducting plate, a conveying pipe is installed on the side, away from the tail gas pipe, of the water tank, and tail gas reaching the standard can be conveyed into the first connecting pipe, the heat conducting plate, the second connecting pipe and the conveying pipe through the tail gas pipe, so that water in the water tank is heated through the heat conducting plate; and the waste heat is conveyed into the conveying pipe and the coal room pipe again, so that the cooled waste heat is conveyed into the coal room from the spray head end, the temperature of the coal room is increased, the coal room is dried, redundant water in the coal is removed, the hygroscopicity of the coal is reduced, and the utilization rate of the waste heat is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat utilization, in particular to a device for utilizing waste heat from tail gas of a thermal power plant. Background Art

[0002] Thermal power generation is a method of generating electricity by converting the heat energy generated by the combustion of combustibles into electrical energy through a power generation device. Coal-fired power generation is the main method of power generation in my country. Since coal combustion produces a large amount of gases such as sulfur dioxide and carbon monoxide, it aggravates environmental pollution. Among them, the amount of flue gas generated by boiler combustion and the amount of pollutants it contains are far greater than other waste gases. This is the focus of pollution control. In recent years, my country has been treating the exhaust gas from thermal power generation, and the exhaust gas can only be discharged after it meets the treatment standards.

[0003] In the authorized patent document with the announcement number CN209263005U, a device for utilizing waste heat from exhaust gas of a thermal power plant is disclosed, comprising a base, rollers are fixedly mounted on both sides of the bottom of the base, water tanks are fixedly mounted on both sides of the top of the base, a cover plate is movably sleeved on the top of the water tank, threaded pipes are fixedly sleeved on the tops of both sides of the water tank, two ends of the threaded pipes extend to the inside and outside of the water tank respectively, a heat conduction pipe is arranged inside the water tank, connecting pipes are threadedly sleeved on both ends of the heat conduction pipe, the device for utilizing waste heat from exhaust gas of a thermal power plant passes treated exhaust gas into an air inlet pipe, so that the exhaust gas enters the heat conduction pipe via the threaded pipe and the connecting pipe, and the heat conduction pipe is used to introduce the heat carried by the exhaust gas into the desalted water inside the water tank, so that the desalted water absorbs the waste heat, which is beneficial to improving the waste heat recovery efficiency, thereby saving energy and improving the practicality of the device.

[0004] Traditional exhaust gas waste heat utilization devices generally transport the waste heat to a water tank, allowing the waste heat to heat the water inside the water tank, thereby boiling water. After the waste heat boils the water, the waste heat temperature in the exhaust gas will drop a lot, but there is still some temperature, which is often ignored, resulting in a waste of waste heat. Utility Model Content

[0005] The purpose of the utility model is to provide a device for utilizing waste heat from tail gas of a thermal power plant, which solves the problem that traditional devices for utilizing waste heat from tail gas generally transport waste heat to a water tank, so that the waste heat heats the water inside the water tank, thereby playing the role of boiling water. After the waste heat boils the water, the waste heat temperature in the tail gas will drop a lot, but there are still some temperatures, which are often ignored, resulting in the problem of waste heat waste.

[0006] An embodiment of the present application provides a device for utilizing waste heat from exhaust gas in a thermal power plant, comprising a water tank, a tail gas pipe being installed on one side of the water tank, a first connecting pipe being installed on the inner wall of the water tank, the first connecting pipe corresponding to the position of the tail gas pipe, a heat conducting plate being installed on the side of the first connecting pipe away from the tail gas pipe, the heat conducting plate being arranged in a wave shape, a second connecting pipe being installed on the side of the heat conducting plate away from the first connecting pipe, a delivery pipe being installed on the side of the water tank away from the tail gas pipe, the delivery pipe corresponding to the position of the second connecting pipe, a coal room pipe being installed on the side of the delivery pipe away from the water tank, and a plurality of groups of nozzles being installed on the lower end of the coal room pipe.

[0007] By adopting the above technical scheme, the exhaust gas that meets the standards can be transported to the first connecting pipe, the heat conduction plate, the second connecting pipe and the delivery pipe through the exhaust pipe, so that the heat conduction plate heats the water in the water tank, and the waste heat is transported to the delivery pipe and the coal room pipe again, so that the cooled waste heat is transported from the nozzle end to the coal room, raising the temperature of the coal room, drying the coal room, removing excess moisture in the coal, thereby reducing its hygroscopicity, and enhancing the utilization rate of the waste heat.

[0008] Optionally, a plurality of groups of U-shaped blocks are installed on the inner bottom wall of the water tank, and the plurality of groups of U-shaped blocks are in contact with the heat conducting plate.

[0009] By adopting the above technical solution, the water tank can fix the U-shaped block, and the U-shaped block can support the heat conducting plate.

[0010] Optionally, inner walls of the water tank that are arranged opposite to each other are respectively fixedly connected with a plurality of groups of support rods, and the plurality of groups of support rods abut against the inner arc surface above the heat conducting plate.

[0011] By adopting the above technical solution, the water tank can fix the support rod, and the support rod can support and limit the upper part of the heat conducting plate.

[0012] Optionally, a flow area is formed between the heat conducting plate and the inner wall of the water tank.

[0013] By adopting the above technical solution, a flow area is formed between the heat conducting plate and the inner wall of the water tank, so that water can flow inside the water tank.

[0014] Optionally, a water injection pipe is installed on the outer wall of the water tank, and the water injection pipe is located above one side of the water tank.

[0015] By adopting the above technical solution, the water tank can play a role in fixing the water injection pipe, and the water injection pipe is located above the water tank to facilitate water injection into the water tank.

[0016] Optionally, a drain pipe is installed on a side of the water tank away from the water injection pipe, and the drain pipe is located below one side of the water tank.

[0017] By adopting the above technical solution, the water tank can fix the drain pipe, and the drain pipe is located under the water tank to facilitate drainage.

[0018] Optionally, valves are installed inside the water injection pipe and the drainage pipe respectively.

[0019] By adopting the above technical solution, the water injection pipe and the drainage pipe can be opened and closed respectively through the two valves.

[0020] Optionally, a cover is mounted on the upper end of the water tank by bolts.

[0021] By adopting the above technical solution, the cover and the water tank can be closed by the bolts.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] The technical solution of the present application can transport the qualified exhaust gas to the first connecting pipe, the heat conducting plate, the second connecting pipe and the delivery pipe through the exhaust pipe, so that the heat conducting plate can heat the water in the water tank, and the waste heat is transported to the delivery pipe and the coal room pipe again, so that the cooled waste heat is transported from the nozzle end to the coal room, raising the temperature of the coal room, drying the coal room, removing excess moisture in the coal, thereby reducing its hygroscopicity, and enhancing the utilization rate of the waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0025] Figure 1 It is a front view schematic diagram of a device for utilizing waste heat from tail gas of a thermal power plant according to the utility model;

[0026] Figure 2 This is a schematic diagram of a top view of a device for utilizing waste heat from tail gas in a thermal power plant according to the utility model;

[0027] Figure 3 The utility model is a thermal power plant tail gas waste heat utilization device Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 The utility model is a front view of the partial cross-section of a water tank of a device for utilizing waste heat from tail gas in a thermal power plant.

[0029] In the figure: 1. water tank; 2. tail gas pipe; 3. first connecting pipe; 4. heat conduction plate; 5. delivery pipe; 6. coal room pipe; 7. nozzle; 8. U-shaped block; 9. support rod; 10. cover; 11. water injection pipe; 12. drainage pipe; 13. valve; 14. second connecting pipe. DETAILED DESCRIPTION

[0030] See also Figure 1-4 The utility model provides a technical solution: a device for utilizing waste heat from tail gas in a thermal power plant, comprising a water tank 1, a tail gas pipe 2 is installed on one side of the water tank 1, a first connecting pipe 3 is installed on the inner wall of the water tank 1, the first connecting pipe 3 corresponds to the position of the tail gas pipe 2, a heat conducting plate 4 is installed on the side of the first connecting pipe 3 away from the tail gas pipe 2, the heat conducting plate 4 is arranged in a wave shape, a second connecting pipe 14 is installed on the side of the heat conducting plate 4 away from the first connecting pipe 3, a delivery pipe 5 is installed on the side of the water tank 1 away from the tail gas pipe 2, the delivery pipe 5 corresponds to the position of the second connecting pipe 14, a coal room pipe 6 is installed on the side of the delivery pipe 5 away from the water tank 1, and a plurality of groups of nozzles 7 are installed at the lower end of the coal room pipe 6, a water injection pipe 11 is installed on the outer wall of the water tank 1, the water injection pipe 11 is located above one side of the water tank 1, a drainage pipe 12 is installed on the side of the water tank 1 away from the water injection pipe 11, and the drainage pipe 12 is located below one side of the water tank 1.

[0031] In the technical solution of the utility model, the exhaust gas that meets the standards can be transported to the first connecting pipe 3, the heat conducting plate 4, the second connecting pipe 14 and the delivery pipe 5 through the exhaust pipe 2, so that the heat conducting plate 4 heats the water in the water tank 1, and the waste heat is transported to the delivery pipe 5 and the coal room pipe 6 again, so that the cooled waste heat is transported from the nozzle 7 end to the coal room, raising the temperature of the coal room, drying the coal room, removing excess moisture in the coal, thereby reducing its hygroscopicity, and enhancing the utilization rate of the waste heat.

[0032] In addition, the water tank 1 can be used to fix the water injection pipe 11, and the water injection pipe 11 is located above the water tank 1 to facilitate water injection into the water tank 1. The water tank 1 can be used to fix the drainage pipe 12, and the drainage pipe 12 is located below the water tank 1 to facilitate drainage.

[0033] In the technical solution of the utility model, if Figure 1 and Figure 2 As shown, valves 13 are installed inside the water injection pipe 11 and the drainage pipe 12 respectively. The water injection pipe 11 and the drainage pipe 12 can be opened and closed respectively through the two valves 13.

[0034] In the technical solution of the utility model, if Figure 2 and Figure 4As shown, the inner bottom wall of the water tank 1 is installed with multiple groups of U-shaped blocks 8, and the multiple groups of U-shaped blocks 8 are in contact with the heat conducting plate 4. The water tank 1 can fix the U-shaped blocks 8, and the U-shaped blocks 8 can support the heat conducting plate 4. The relatively inner walls of the water tank 1 are respectively fixedly connected with multiple groups of support rods 9, and the multiple groups of support rods 9 are in contact with the inner arc surface above the heat conducting plate 4. The water tank 1 can fix the support rods 9, and the support rods 9 can support and limit the upper part of the heat conducting plate 4. A flow area is formed between the heat conducting plate 4 and the inner wall of the water tank 1. The flow area formed between the heat conducting plate 4 and the inner wall of the water tank 1 allows water to flow inside the water tank 1.

[0035] In the technical solution of the utility model, if Figure 1 and Figure 4 As shown, a cover 10 is installed on the upper end of the water tank 1 by means of bolts, and the cover 10 and the water tank 1 can be closed by means of the bolts.

[0036] When in use, the exhaust gas that meets the standards can first be transported to the first connecting pipe 3, the heat conducting plate 4, the second connecting pipe 14 and the delivery pipe 5 through the exhaust pipe 2, so that the heat conducting plate 4 heats the water in the water tank 1, and the waste heat is transported to the delivery pipe 5 and the coal room pipe 6 again, so that the waste heat of cooling can be transported to the coal room from the nozzle 7 end, the temperature of the coal room is increased, the coal room is dried, and the excess moisture in the coal is removed, thereby reducing its hygroscopicity, thereby enhancing the utilization rate of the waste heat, and the U-shaped block 8 can support the lower end of the heat conducting plate 4, and the support rod 9 can support the heat conducting plate 4. The top of the hot plate 4 plays a supporting role, and the flow area between the heat conducting plate 4 and the inside of the water tank 1 can facilitate the flow of water, and the water tank 1 can fix the water injection pipe 11, and the water injection pipe 11 is located above the water tank 1 to facilitate the injection of water into the water tank 1, and the water tank 1 can fix the drain pipe 12, and the drain pipe 12 is located below the water tank 1 to facilitate drainage, and the two valves 13 can respectively open and close the water injection pipe 11 and the drain pipe 12, and the setting of the cover 10 can facilitate the staff to clean and repair the inside of the water tank 1.

Claims

1. A device for utilizing waste heat from tail gas of a thermal power plant, characterized in that: The invention comprises a water tank (1), a tail gas pipe (2) is installed on one side of the water tank (1), a first connecting pipe (3) is installed on the inner wall of the water tank (1), the first connecting pipe (3) corresponds to the position of the tail gas pipe (2), a heat conducting plate (4) is installed on the side of the first connecting pipe (3) away from the tail gas pipe (2), the heat conducting plate (4) is arranged in a wave shape, a second connecting pipe (14) is installed on the side of the heat conducting plate (4) away from the first connecting pipe (3), a delivery pipe (5) is installed on the side of the water tank (1) away from the tail gas pipe (2), the delivery pipe (5) corresponds to the position of the second connecting pipe (14), a coal room pipe (6) is installed on the side of the delivery pipe (5) away from the water tank (1), and a plurality of groups of nozzles (7) are installed at the lower end of the coal room pipe (6).

2. A thermal power plant tail gas waste heat utilization device according to claim 1, characterized in that: The inner bottom wall of the water tank (1) is installed with a plurality of groups of U-shaped blocks (8), and the plurality of groups of U-shaped blocks (8) are in contact with the heat conduction plate (4).

3. A thermal power plant tail gas waste heat utilization device according to claim 2, characterized in that: The inner walls of the water tank (1) arranged opposite to each other are respectively fixedly connected with a plurality of groups of support rods (9), and the plurality of groups of support rods (9) abut against the inner arc surface above the heat conducting plate (4).

4. A thermal power plant tail gas waste heat utilization device according to claim 3, characterized in that: A flow area is formed between the heat conducting plate (4) and the inner wall of the water tank (1).

5. The device for utilizing waste heat from tail gas of a thermal power plant according to claim 1, characterized in that: A water injection pipe (11) is installed on the outer wall of the water tank (1), and the water injection pipe (11) is located above one side of the water tank (1).

6. The device for utilizing waste heat from tail gas of a thermal power plant according to claim 5, characterized in that: A drainage pipe (12) is installed on a side of the water tank (1) away from the water injection pipe (11), and the drainage pipe (12) is located below one side of the water tank (1).

7. A thermal power plant tail gas waste heat utilization device according to claim 6, characterized in that: Valves (13) are respectively installed inside the water injection pipe (11) and the drainage pipe (12).

8. The device for utilizing waste heat from tail gas of a thermal power plant according to claim 7, characterized in that: A cover (10) is mounted on the upper end of the water tank (1) via bolts.

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