Flue gas waste heat recycling device for thermal power plant

Abstract

The utility model relates to a flue gas waste heat recycling device for a thermal power plant, and belongs to the technical field of waste heat recycling, the flue gas waste heat recycling device comprises a recycling tank, a gas pipe, a water pipe and a turbulent flow mechanism, the recycling tank is provided with a gas inlet, a gas outlet, a water inlet and a water outlet in a communicating mode, and the two ends of the gas pipe are arranged on the gas inlet and the gas outlet in a communicating mode respectively; the gas pipe is spirally arranged in the recovery tank and used for conveying flue gas, the two ends of the water pipe are communicated with the water inlet and the water outlet respectively, the water pipe is spirally arranged in the recovery tank and wraps the gas pipe, and a channel for a water source to flow is formed between the water pipe and the gas pipe. And the turbulent flow mechanism is arranged on the inner wall of the gas pipe and is used for reducing the flow speed of the flue gas in the gas pipe. The flue gas waste heat recovery device has the effect of improving the recovery efficiency of flue gas waste heat of the thermal power plant.

Description

Technical Field

[0001] The present application relates to the field of waste heat recovery technology, and in particular to a device for recovering waste heat from flue gas in a thermal power plant. Background Art

[0002] A thermal power plant is a plant that uses combustibles (such as coal) as fuel to produce electricity. Its basic production process is: when the fuel is burned, it heats water to generate steam, converting the chemical energy of the fuel into thermal energy. The steam pressure drives the turbine to rotate, converting the thermal energy into mechanical energy. The turbine then drives the generator to rotate, converting the mechanical energy into electrical energy. During the operation of a thermal power plant, flue gas emissions take away a lot of heat, resulting in a waste of energy.

[0003] At present, in order to recover this part of waste heat and improve energy utilization efficiency, various flue gas waste heat recovery devices have emerged. Common flue gas waste heat recovery devices mainly use heat exchangers for heat recovery. Although these heat exchangers can recover part of the heat, they are limited by factors such as material and structure, and the recovery efficiency is not high. Utility Model Content

[0004] In order to improve the recovery efficiency of flue gas waste heat in thermal power plants, the present application provides a device for recovering and utilizing flue gas waste heat in thermal power plants.

[0005] The present application provides a thermal power plant flue gas waste heat recovery and utilization device adopts the following technical solution:

[0006] A device for recovering waste heat from flue gas in a thermal power plant comprises a recovery tank, an air pipe, a water pipe and a spoiler mechanism, wherein an air inlet, an air outlet, a water inlet and a water outlet are connected on the recovery tank, and two ends of the air pipe are connected and arranged on the air inlet and the air outlet respectively. The air pipe is spirally arranged in the recovery tank and is used to transport flue gas, and two ends of the water pipe are connected and arranged on the water inlet and the water outlet respectively. The water pipe is spirally arranged in the recovery tank and covers the air pipe therein, and a channel for water supply source flow is formed between the water pipe and the air pipe, and the spoiler mechanism is arranged on the inner wall of the air pipe and is used to reduce the flow velocity of the flue gas in the air pipe.

[0007] By adopting the above technical scheme, the staff introduces the flue gas generated during the operation of the thermal power plant into the air inlet, and the flue gas flows through the air pipe to the exhaust port for discharge. At the same time, the staff introduces cold water into the water inlet, and the cold water is discharged from the drain port through the water pipe. The cold water exchanges heat with the flue gas during the circulation in the water pipe, and the cold water is heated and then utilized, thereby realizing the utilization of the waste heat of the flue gas. The air pipe is covered with a water pipe, so that the water in the water pipe can fully exchange heat with the flue gas in the air pipe, and the spirally arranged air pipe and water pipe, as well as the turbulent mechanism, reduce the flow velocity of the flue gas in the air pipe, thereby increasing the heat exchange time between the flue gas and water, and jointly effectively improving the recovery efficiency of the waste heat of the flue gas in the thermal power plant.

[0008] Optionally, the spoiler mechanism includes a plurality of spoilers, which are arranged at intervals on the inner wall of the air pipe, and the spoilers are provided with gaps for allowing smoke to pass through, and the gaps of adjacent spoilers are staggered.

[0009] By adopting the above technical solution, the spoiler blocks the smoke, and then the smoke passes through the gap. The gaps of adjacent spoilers are staggered, so that the smoke flows in a tortuous way in the trachea, thereby reducing the flow rate of the smoke in the trachea.

[0010] Optionally, filter screens are provided on both the air inlet and the water inlet.

[0011] By adopting the above technical scheme, the filter on the air inlet will filter impurities in the flue gas entering the trachea, reduce the impurity content of the flue gas entering the trachea, and further reduce the amount of impurities in the flue gas adhering to the inner wall of the trachea. The filter on the water inlet will filter impurities in the water source entering the water pipe, reduce the impurity content of the water entering the water pipe, and further reduce the amount of impurities in the water adhering to the outer wall of the trachea, thereby jointly reducing the influence of impurities adhering to the trachea on the heat exchange efficiency between the flue gas and water.

[0012] Optionally, the exhaust port is provided with a temperature measuring instrument for measuring the temperature of the gas exhausted from the exhaust port, and the recovery tank is provided with a gas guiding mechanism for reintroducing the gas flowing to the exhaust port into the air inlet.

[0013] By adopting the above technical solution, the temperature measuring instrument measures the temperature of the gas discharged from the exhaust port. If the measured temperature of the exhaust gas is still high, the gas from the exhaust port is re-introduced into the air inlet through the air guide mechanism, and heat is exchanged with the water in the water pipe again, thereby further improving the recovery efficiency of the flue gas waste heat.

[0014] Optionally, the air guide mechanism includes an exhaust fan, a solenoid valve and a control panel, the exhaust fan is arranged on the recovery tank, the exhaust fan is connected to both the air inlet and the exhaust port, the solenoid valve is arranged on the exhaust port, the control panel is arranged on the recovery tank, and the control panel is electrically connected to the temperature measuring instrument, the exhaust fan and the solenoid valve.

[0015] By adopting the above technical solution, the temperature measuring instrument transmits the measured temperature data to the control panel. If the temperature reaches the set value, the control panel controls the solenoid valve to close and controls the exhaust fan to start. The exhaust fan can then draw the gas from the exhaust port to the air inlet, making it easier to convert the gas from the exhaust port to the air inlet.

[0016] Optionally, a support frame is provided on the recovery tank, the support frame is sleeved on the water pipe, and a support component for supporting the air pipe is provided on the water pipe.

[0017] By adopting the above technical solution, the support frame supports the water pipe to improve the stability of the water pipe in the recovery tank, and the support assembly supports the air pipe to improve the stability of the air pipe in the water pipe.

[0018] Optionally, the support assembly includes a support sleeve, a support rod and a spring, the support sleeve is arranged on the inner wall of the water pipe, the support rod is slidably inserted on the inner wall of the support sleeve and connected to the air pipe, and the spring is arranged on the inner bottom wall of the support sleeve and connected to the support rod.

[0019] By adopting the above technical solution, when the water in the water pipe impacts the air pipe, and the smoke impacts the air pipe, the air pipe squeezes or pulls the support rod, causing the support rod to slide in the support sleeve. During the sliding process of the support rod, the spring is squeezed or stretched, and the spring buffers the support rod, and then buffers the air pipe, thereby further improving the stability of the air pipe.

[0020] Optionally, the outer circumference of the water pipe is covered with an insulation layer.

[0021] By adopting the above technical solution, the insulation layer insulates the water pipe and reduces the heat loss of the water pipe.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The water pipe covers the air pipe, so that the water in the water pipe can fully exchange heat with the flue gas in the air pipe. The spiral air pipe and water pipe, as well as the spoiler mechanism, reduce the flow rate of the flue gas in the air pipe, increase the heat exchange time between the flue gas and water, and effectively improve the recovery efficiency of the waste heat of the flue gas in the thermal power plant;

[0024] 2. If the temperature of the exhaust gas is still high, the gas at the exhaust port is reintroduced into the air inlet through the air guide mechanism to exchange heat with the water in the water pipe again, further improving the recovery efficiency of flue gas waste heat;

[0025] 3. The spring cushions the support rod, and then cushions the trachea, further improving the stability of the trachea. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional schematic diagram of a flue gas waste heat recovery and utilization device for a thermal power plant according to an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the trachea in an embodiment of the present application.

[0028] Figure 3 It is a schematic structural diagram of a partial cross-section of a recovery tank and a water pipe according to an embodiment of the present application.

[0029] Figure 4 This is a schematic diagram of the structure of the support assembly of the embodiment of the present application (the support sleeve is partially cut away in the figure)

[0030] Figure numerals: 1. recovery tank; 2. air pipe; 3. water pipe; 4. spoiler mechanism; 41. spoiler; 411. notch; 5. air inlet; 6. exhaust port; 7. water inlet; 8. drain port; 9. filter; 10. temperature measuring instrument; 11. air guide mechanism; 111. exhaust fan; 112. solenoid valve; 113. control panel; 12. support frame; 13. support assembly; 131. support sleeve; 132. support rod; 133. spring; 14. insulation layer. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] The embodiment of the present application discloses a device for recovering waste heat from flue gas in a thermal power plant.

[0033] Reference Figure 1 The flue gas waste heat recovery and utilization device of a thermal power plant includes a recovery tank 1, an air pipe 2, a water pipe 3 and a turbulent mechanism 4.

[0034] Reference Figure 1The recovery tank 1 is a tank body with a hollow interior. An air inlet 5 and a water inlet 7 are connected and installed on one side of the recovery tank 1, and an exhaust port 6 and a drain port 8 are connected and installed on the other side of the recovery tank 1. In the present embodiment, valves are installed on the air inlet 5, the water inlet 7 and the drain port 8 to facilitate the control of opening and closing; one end of the air pipe 2 is connected and installed on the air inlet 5, and the other end of the air pipe 2 is connected and installed on the air outlet. The air pipe 2 is installed in a spiral manner in the recovery tank 1, and the air pipe 2 is used to transport flue gas. One end of the water pipe 3 is connected and installed on the water inlet 7, and the other end of the water pipe 3 is connected and installed on the drain port 8. The water pipe 3 is installed in a spiral manner in the recovery tank 1, and the water pipe 3 is used to transport water, and the water pipe 3 covers the air pipe 2 inside, and a channel for the water source to flow is formed between the inner wall of the water pipe 3 and the outer wall of the air pipe 2.

[0035] The staff introduces the flue gas generated during the production and operation of the thermal power plant into the air inlet 5 through a pipeline, and introduces cold water into the water inlet 7 through a pipeline. The flue gas flows along the air pipe 2 to the exhaust port 6 for discharge, and the cold water flows along the water pipe 3 to the drain port 8 for discharge. In the process of the flue gas flowing in the air pipe 2, heat exchange occurs with the air pipe 2, and the air pipe 2 then exchanges heat with the surrounding cold water to heat the cold water. The heated cold water can be used, thereby realizing the recovery of the waste heat of the flue gas. By using the water pipe 3 to cover the air pipe 2 and by spirally installing the air pipe 2 and the water pipe 3, the time for heat exchange between the flue gas and water is increased, and the market for heat exchange between the flue gas and water is increased, so that the flue gas can more fully exchange heat with water, effectively improving the recovery efficiency of the waste heat of the flue gas in the thermal power plant.

[0036] Reference Figure 1 The outer periphery of the water pipe 3 is coated with a heat-insulating layer 14, which may be polyurethane foam, mineral wool, glass wool, etc. In this embodiment, the heat-insulating layer 14 is glass wool, which is tied to the water pipe 3 by a cable tie and has good heat-insulating performance. The heat-insulating layer 14 covers the water pipe 3, reduces the heat loss of the water pipe 3 to the outside, and ensures the recovery efficiency of the waste heat of the flue gas.

[0037] Reference Figure 1 , Figure 2 The spoiler mechanism 4 is installed on the inner wall of the air pipe 2. The spoiler mechanism 4 is used to reduce the flow rate of the smoke in the air pipe 2. The spoiler mechanism 4 includes a plurality of spoilers 41. The plurality of spoilers 41 are installed on the inner wall of the air pipe 2 at intervals. The spoilers 41 are provided with notches 411 so that the smoke can flow through the notches 411. The notches 411 of adjacent spoilers 41 are staggered. In this embodiment, the spoiler 41 is also provided with a plurality of air holes, so that when the smoke flows to the spoiler 41, the smoke can pass through the air holes regardless of the smoke, thereby reducing the impact of the smoke on the spoiler 41.

[0038] When the smoke flows in the trachea 2, the spoiler 41 blocks the flow of the smoke, and then the smoke flows through the notch 411. The notches 411 of adjacent spoilers 41 are staggered with each other, so that the smoke flows in a tortuous manner in the trachea 2, reducing the flow rate of the smoke in the trachea 2, allowing the smoke to fully exchange heat with water, further improving the recovery efficiency of the waste heat of the smoke.

[0039] Reference Figure 1 , Figure 3 A temperature measuring instrument 10 is installed on the exhaust port 6, and the temperature measuring instrument is used to measure the temperature of the gas discharged from the exhaust port 6; an air guide mechanism 11 is installed on the recovery tank 1, and the air guide mechanism 11 is used to re-introduce the smoke flowing to the exhaust port 6 to the air inlet 5. The air guide mechanism 11 includes an exhaust fan 111, a solenoid valve 112 and a control panel 113. The exhaust fan 111 is installed on the recovery tank 1, and the air inlet end of the exhaust fan 111 is connected and installed on the exhaust port 6, and the air outlet end of the exhaust fan 111 is connected and installed on the air inlet 5 through a pipeline. The solenoid valve 112 is installed on the exhaust port 6, and the control panel 113 is installed on the recovery tank 1, and the control panel 113 is electrically connected to the temperature measuring instrument 10, the exhaust fan 111 and the solenoid valve 112.

[0040] The temperature measuring instrument 10 detects the temperature of the gas discharged from the exhaust port 6, and then transmits the detected temperature data to the control panel 113. If the temperature data is lower than the set temperature value, the gas is discharged from the exhaust port 6. If the temperature data is higher than the set temperature value, the control panel 113 controls the solenoid valve 112 to close, and then controls the exhaust fan 111 to start. The exhaust fan 111 can draw the gas flowing to the exhaust port 6 into the air inlet 5, heat the water again, and further improve the recovery efficiency of the flue gas waste heat.

[0041] Reference Figure 3 A support frame 12 is installed on the recovery tank 1, and the support frame 12 is sleeved on the water pipe 3. In this embodiment, the support frame 12 includes a connecting rod and a clamp. The connecting rod is installed on the inner wall of the recovery tank 1, and the clamp is installed on the connecting rod and clamped on the water pipe 3, thereby supporting the water pipe 3 and improving the stability of the water pipe 3 in the recovery tank 1.

[0042] Reference Figure 3 , Figure 4A support assembly 13 is installed on the water pipe 3. The support assembly 13 is used to support the air pipe 2. The support assembly 13 includes a support sleeve 131, a support rod 132 and a spring 133. The support sleeve 131 is installed on the inner wall of the water pipe 3. The support sleeve 131 is hollow inside and has an opening on one side close to the air pipe 2. The support rod 132 is slidably inserted on the inner wall of the support sleeve 131. One end of the support rod 132 away from the support sleeve 131 is clamped on the air pipe 2 through a clamp. One end of the spring 133 is installed on the inner bottom wall of the support sleeve 131, and the other end of the spring 133 is installed on the support rod 132.

[0043] When the water in the water pipe 3 flows, it will impact the trachea 2. When the smoke in the trachea 2 flows, it will also impact the trachea 2. After the trachea 2 is impacted, it drives the support rod 132 to move away from the support sleeve 131 or close to the support sleeve 131. During the movement of the support rod 132, the spring 133 is pulled to stretch or squeeze the spring 133, so that the spring 133 buffers the movement of the support rod 132, and then buffers the movement of the trachea 2, thereby supporting the trachea 2 while providing a buffer for the trachea 2, thereby improving the stability of the trachea 2.

[0044] Reference Figure 1 , Figure 3 A filter screen 9 is installed on both the air inlet 5 and the water inlet 7. In the present embodiment, the filter screen 9 is a stainless steel filter screen 9, and the filter screen 9 is located on the inner wall of the air inlet 5 and the exhaust port 6 away from the recovery tank 1, so that the staff can clean the filter screen 9 conveniently.

[0045] When smoke enters the air inlet 5, the filter 9 filters impurities in the smoke, reduces the impurity content in the smoke entering the trachea 2, and further reduces the amount of impurities in the smoke adhering to the inner wall of the trachea 2, and reduces the influence of impurities adhering to the inner wall of the trachea 2 on the heat conduction of the smoke; when water enters the water inlet 7, the filter 9 filters impurities in the water, reduces the impurity content in the water entering the water pipe 3, and further reduces the amount of impurities in the water adhering to the outer wall of the trachea 2, and reduces the influence of impurities adhering to the outer wall of the trachea 2 on the heat exchange between the smoke and water, thereby jointly ensuring the heat exchange efficiency between the smoke and water.

[0046] The implementation principle of a device for recovering and utilizing waste heat from flue gas in a thermal power plant in an embodiment of the present application is as follows: a worker introduces the flue gas generated during the production and operation of the thermal power plant into the air inlet 5, and introduces cold water into the water inlet 7. In the process of the flue gas flowing from the air pipe 2 to the air outlet, the water flowing in the water pipe 3 is heated, and the hot water can be utilized later to realize the recovery and utilization of the waste heat from the flue gas. The air pipe 2 is wrapped with the water pipe 3, the flow rate of the flue gas is slowed down by the spoiler 41, and the spirally installed air pipe 2 and water pipe 3 enhance the heat exchange time between the flue gas and the water, so that the flue gas can fully exchange heat with the water. When the temperature of the flue gas flowing out of the exhaust port 6 is higher than the set value, the control panel 113 can also control the exhaust fan 111 to draw the flue gas back to the air inlet 5 again for heat exchange with the water again, thereby effectively improving the recovery efficiency of the waste heat from the flue gas in the thermal power plant.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A device for recovering waste heat from flue gas in a thermal power plant, characterized in that: The invention comprises a recovery tank (1), an air pipe (2), a water pipe (3) and a flow disturbance mechanism (4); the recovery tank (1) is provided with an air inlet (5), an air outlet (6), a water inlet (7) and a water outlet (8); the two ends of the air pipe (2) are respectively provided on the air inlet (5) and the air outlet (6); the air pipe (2) is spirally provided in the recovery tank (1) and is used for conveying smoke; the two ends of the water pipe (3) are respectively provided on the water inlet (7) and the water outlet (8); the water pipe (3) is spirally provided in the recovery tank (1) and covers the air pipe (2); a channel for the flow of a water supply source is formed between the water pipe (3) and the air pipe (2); the flow disturbance mechanism (4) is provided on the inner wall of the air pipe (2) and is used for reducing the flow velocity of smoke in the air pipe (2).

2. The device for recovering waste heat from flue gas in a thermal power plant according to claim 1, characterized in that: The spoiler mechanism (4) comprises a plurality of spoilers (41), the plurality of spoilers (41) being arranged at intervals on the inner wall of the air pipe (2), the spoilers (41) being provided with notches (411) for allowing smoke to pass through, and the notches (411) of adjacent spoilers (41) being arranged in a staggered manner.

3. The device for recovering waste heat from flue gas in a thermal power plant according to claim 1, characterized in that: The air inlet (5) and the water inlet (7) are both provided with filter screens (9).

4. The device for recovering waste heat from flue gas in a thermal power plant according to claim 1, characterized in that: The exhaust port (6) is provided with a temperature measuring instrument (10) for measuring the temperature of the gas exhausted from the exhaust port (6), and the recovery tank (1) is provided with a gas guide mechanism (11) for reintroducing the gas flowing to the exhaust port (6) into the gas inlet (5).

5. The device for recovering waste heat from flue gas in a thermal power plant according to claim 4, characterized in that: The air guide mechanism (11) comprises an exhaust fan (111), an electromagnetic valve (112) and a control panel (113); the exhaust fan (111) is arranged on the recovery tank (1); the exhaust fan (111) is in communication with both an air inlet (5) and an air outlet (6); the electromagnetic valve (112) is arranged on the air outlet (6); the control panel (113) is arranged on the recovery tank (1); and the control panel (113) is electrically connected to the temperature measuring instrument (10), the exhaust fan (111) and the electromagnetic valve (112).

6. The device for recovering waste heat from flue gas in a thermal power plant according to claim 1, characterized in that: The recovery tank (1) is provided with a support frame (12), the support frame (12) is sleeved on the water pipe (3), and the water pipe (3) is provided with a support component (13) for supporting the air pipe (2).

7. The device for recovering waste heat from flue gas in a thermal power plant according to claim 6, characterized in that: The support assembly (13) comprises a support sleeve (131), a support rod (132) and a spring (133); the support sleeve (131) is arranged on the inner wall of the water pipe (3); the support rod (132) is slidably inserted on the inner wall of the support sleeve (131) and connected to the air pipe (2); and the spring (133) is arranged on the inner bottom wall of the support sleeve (131) and connected to the support rod (132).

8. The device for recovering waste heat from flue gas in a thermal power plant according to claim 1, characterized in that: The outer periphery of the water pipe (3) is covered with a thermal insulation layer (14).

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