Boiler flue gas waste heat recovery device

Abstract

The present application relates to a boiler flue gas waste heat recovery and utilization device, and relates to the field of boiler equipment, which includes a heat temporary storage mechanism arranged on a furnace body, a preheating mechanism arranged on an air intake pipe, a heat recovery pipe is connected through the heat temporary storage mechanism and the exhaust pipe, a heat outlet pipe is connected through the heat temporary storage mechanism and the preheating mechanism, and a preheating cavity is formed between the preheating mechanism and the air intake pipe. The present application has the effect of increasing the recovery and utilization of heat in the exhaust gas discharged by the boiler and reducing energy waste.

Description

Technical Field

[0001] The present application relates to the field of boiler equipment, and in particular to a boiler flue gas waste heat recovery and utilization device. Background Art

[0002] Industrial boilers are common thermal equipment, generally used to heat water or steam for factory production.

[0003] Reference Figure 1 A boiler includes a furnace body 1, a plurality of pipes are arranged inside the furnace body 1, a burner connection port and an exhaust pipe 2 are opened on the furnace body 1, an air inlet pipe 3 is opened on the furnace body 1, the air inlet pipe 3 is connected with the pipe, the air inlet pipe 3 can be connected to a water source or a gas source, the pipe inside the furnace body 1 is heated by the burner, so as to heat the gas or water inside the pipe, and the exhaust gas generated in the combustion process is discharged from the exhaust pipe 2.

[0004] The exhaust gas carries a large amount of heat, and directly discharging this part of the flue gas into the atmosphere will cause a waste of energy. Summary of the invention

[0005] In order to increase the recovery and utilization of heat in boiler exhaust gas and reduce energy waste, the present application provides a boiler flue gas waste heat recovery and utilization device.

[0006] The boiler flue gas waste heat recovery device provided in this application adopts the following technical solution:

[0007] A boiler flue gas waste heat recovery and utilization device comprises a heat temporary storage mechanism arranged on a furnace body and a preheating mechanism arranged on an air intake pipe, a heat recovery pipe is connected through the heat temporary storage mechanism and the exhaust pipe, a heat outlet pipe is connected through the heat temporary storage mechanism and the preheating mechanism, and a preheating chamber is formed between the preheating mechanism and the air intake pipe.

[0008] By adopting the above technical solution, the exhaust gas with heat discharged from the exhaust pipe can enter the heat temporary storage mechanism through the heat recovery pipe, and this part of the heat can enter the preheating chamber through artificial control. The heat in the preheating chamber can preheat the intake pipe. At this time, the gas passing through the intake pipe will be preheated, thereby reducing the gas heating time. Through this setting, the exhaust gas discharged from the exhaust pipe can be effectively utilized, which is beneficial to reduce the waste of energy and energy, and at the same time improve the heating efficiency of the boiler.

[0009] Optionally, the heat temporary storage mechanism includes a heat storage furnace, an elastic leather bag arranged in the heat storage furnace, a baffle slidably connected to the heat storage furnace, and a pushing component arranged on the heat storage furnace for pushing the baffle to move, a ventilation cavity is provided in the heat storage furnace, an air inlet and an air outlet penetrating the ventilation cavity are provided on the heat storage furnace, the heat recovery pipe is connected to the air inlet and the exhaust pipe, the heat outlet pipe is connected to the preheating mechanism and the air outlet, the bag opening of the elastic leather bag faces the air inlet, and the bag opening side wall of the elastic leather bag It is fixedly connected to the inner wall of the ventilation cavity, and the elastic leather bag divides the ventilation cavity into cavity one and cavity two which are not connected to each other. The cavity one is connected with the heat recovery pipe, and the cavity two is connected with the heat outlet pipe. A ventilation flow channel is opened on the inner wall of the heat storage furnace, and one end of the ventilation flow channel is connected with cavity one, and the other end is connected with cavity two. A solenoid valve 1 for sealing the inner cavity of the ventilation flow channel is arranged in the ventilation flow channel. The baffle is arranged in a direction perpendicular to the inner wall of the furnace body, and the baffle can be slid to cover the bag mouth of the elastic leather bag.

[0010] By adopting the above technical solution, when the exhaust gas is discharged from the exhaust pipe, the first method is to use the baffle to cover the bag opening of the elastic leather bag. At this time, the solenoid valve 1 remains in an open state, and the exhaust gas directly enters the ventilation flow channel through the ventilation cavity and enters the preheating mechanism through the air outlet. This can directly heat the intake pipe when the gas passes through the intake pipe; the second method is to make the baffle detach from the bag opening of the elastic leather bag, and the solenoid valve 1 is in a closed state. At this time, when the gas enters the ventilation cavity through the heat recovery pipe, as the gas continues to increase, the volume of the elastic leather bag is continuously expanded. At this time, the exhaust gas with heat can be temporarily stored in the cavity 1. When the intake pipe needs to be preheated, the solenoid valve 1 is opened. At this time, the gas in the cavity 1 can enter the cavity 2 through the ventilation flow channel and enter the preheating mechanism. At the same time, when the solenoid valve 1 is opened, there is an air pressure difference between the cavity 1 and the cavity 2. Therefore, the air pressure can push the elastic leather bag, prompting the high-temperature exhaust gas in the elastic leather bag to continuously enter the preheating mechanism, and also achieve the effect of heating the intake pipe.

[0011] Optionally, the inner wall of the elastic leather bag is coated with a high temperature resistant coating.

[0012] By adopting the above technical solution, this arrangement can improve the high temperature resistance of the elastic leather bag.

[0013] Optionally, the pushing assembly includes a cylinder, which is arranged in a direction perpendicular to the side wall of the heat storage furnace, and a piston rod of the cylinder is fixedly connected to the baffle.

[0014] By adopting the above technical solution, when the baffle needs to be pushed, the cylinder is started and the cylinder pushes the baffle.

[0015] Optionally, the outer side wall of the heat storage furnace is wrapped with a heat insulation pad.

[0016] By adopting the above technical solution, the provision of the insulation pad can improve the thermal insulation performance of the heat storage furnace, which is beneficial to reduce the heat transfer between the high-temperature exhaust gas inside the heat storage furnace and the outside world, and is beneficial to reduce the temperature reduction rate of the high-temperature exhaust gas.

[0017] Optionally, the preheating mechanism includes a sleeve and a sealing plate, the sleeve is sleeved on the outside of the air inlet pipe, a preheating chamber is formed between the sleeve and the air inlet pipe, the sealing plate is sleeved on the air inlet pipe and covers the openings at both ends of the preheating chamber, the sealing plate is arranged in a direction perpendicular to the air inlet pipe, an air inlet port is provided on the sleeve, the heat outlet pipe is connected to the air inlet port, an air outlet port is provided on the sleeve, and the air outlet port is provided with an electromagnetic valve 2 for sealing the air outlet port.

[0018] By adopting the above technical solution, the high-temperature exhaust gas enters the preheating chamber through the air intake port and can preheat the pipe wall of the air intake pipe, thereby preheating the low-temperature gas passing through the air intake pipe.

[0019] Optionally, an elastic pad is fixedly connected to the side wall of the sealing plate that contacts the air intake pipe, and the elastic pad fits and contacts the pipe wall of the air intake pipe.

[0020] By adopting the above technical solution, the intake pipe will produce thermal expansion and contraction during the preheating process. The provision of the elastic pad can reduce the impact effect of the thermal expansion and contraction of the intake pipe on the sealing plate, which is beneficial to protecting the intake pipe.

[0021] Optionally, an annular groove is provided on the pipe wall of the air intake pipe, and the elastic gasket is arranged in the annular groove.

[0022] By adopting the above technical solution, the setting of the annular groove can make the preheating mechanism more firmly arranged.

[0023] In summary, this application includes the following beneficial technical effects:

[0024] 1. Through the heat temporary storage mechanism and preheating mechanism, the exhaust gas discharged from the exhaust pipe can be effectively utilized, which is beneficial to reduce the waste of energy and energy, and at the same time improve the heating efficiency of the boiler;

[0025] 2. By setting the elastic pad and the ring groove, the intake pipe can be protected and the heating mechanism can be set more firmly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a boiler flue gas waste heat recovery and utilization device in the background technology.

[0027] Figure 2 It is a structural schematic diagram of a boiler flue gas waste heat recovery and utilization device in an embodiment of the present application.

[0028] Figure 3 It is a side view of a boiler flue gas waste heat recovery device.

[0029] Figure 4 yes Figure 3 Section view at AA in the middle.

[0030] Figure 5 yes Figure 4 Enlarged view of part B in the middle.

[0031] Explanation of the accompanying drawings: 1. furnace body; 2. exhaust pipe; 3. air inlet pipe; 4. heat storage furnace; 5. elastic leather bag; 6. baffle; 7. ventilation cavity; 71. cavity one; 72. cavity two; 8. air inlet; 9. air outlet; 10. heat recovery pipe; 11. cylinder; 12. ventilation flow channel; 13. solenoid valve one; 14. sleeve; 15. sealing plate; 16. preheating chamber; 17. ring groove; 18. elastic pad; 19. air inlet port; 20. heat outlet pipe; 21. air outlet port; 22. thermal insulation pad; 23. solenoid valve two. DETAILED DESCRIPTION

[0032] The following is combined with Figure 2-5 This application is described in further detail.

[0033] The embodiment of the present application discloses a boiler flue gas waste heat recovery and utilization device.

[0034] Reference Figure 2 The boiler flue gas waste heat recovery and utilization device includes a heat temporary storage mechanism arranged on the furnace body 1 and a preheating mechanism arranged on the air intake pipe 3. The high-temperature exhaust gas in the exhaust pipe 2 enters the heat temporary storage mechanism for storage, and then enters the preheating mechanism from the heat temporary storage mechanism. The air intake pipe 3 is preheated by the preheating mechanism, thereby achieving the effect of preheating the low-temperature gas in the air intake pipe 3.

[0035] Reference Figure 3 and Figure 4 The heat temporary storage mechanism includes a heat storage furnace 4, an elastic leather bag 5 arranged in the heat storage furnace 4, a baffle 6 slidably connected to the heat storage furnace 4, and a pushing component arranged on the heat storage furnace 4 for pushing the baffle 6 to move.

[0036] Reference Figure 3 and Figure 4 The heat storage furnace 4 is arranged in a cylindrical shape and is arranged along the length direction of the furnace body 1 of the boiler. The heat storage furnace 4 is fixedly connected to the outer wall of the furnace body 1 of the boiler. The outer wall of the heat storage furnace 4 is wrapped with a heat insulation pad 22, and the heat insulation pad 22 is a cotton pad.

[0037] Reference Figure 3 and Figure 4A ventilation cavity 7 is provided in the heat storage furnace 4, and the ventilation cavity 7 is arranged along the length direction of the heat storage furnace 4. An air inlet 8 and an air outlet 9 which are connected with the ventilation cavity 7 are respectively provided at both ends of the heat storage furnace 4, and the air outlet 9 is close to the exhaust pipe 2. A heat recovery pipe 10 is connected between the air outlet 9 and the exhaust pipe 2, and the heat recovery pipe 10 is a copper pipe.

[0038] Reference Figure 3 and Figure 4 The elastic leather bag 5 is arranged in a bag shape. The material of the elastic leather bag 5 is fluororubber, which is a soft high-temperature resistant rubber. The elastic leather bag 5 is fixedly connected to the ventilation cavity 7. The side wall of the bag opening of the elastic leather bag 5 is fixedly connected to the inner cavity of the ventilation cavity 7. The elastic leather bag 5 divides the ventilation cavity 7 into a cavity 1 71 and a cavity 2 72 which are not connected to each other. Among them, the cavity 1 71 is directly connected to the heat recovery pipe 10.

[0039] Reference Figure 3 and Figure 4 The inner wall of the elastic leather bag 5 is coated with a high temperature resistant paint, which is a phosphate lead powder paint.

[0040] Reference Figure 3 and Figure 4 A chute penetrating the ventilation cavity 7 is provided on the side wall of the heat storage furnace 4 , and a baffle 6 is slidably connected in the chute, and the baffle 6 can be slidably blocked at the bag opening of the elastic leather bag 5 .

[0041] Reference Figure 3 and Figure 4 The pushing component is a cylinder 11, which is arranged on the outer wall of the boiler furnace body 1 and horizontally arranged in a direction perpendicular to the side wall of the heat storage furnace 4, and the piston rod of the cylinder 11 is fixedly connected to the baffle 6.

[0042] Reference Figure 3 and Figure 4 A ventilation channel 12 is provided on the inner wall of the heat storage furnace 4. The ventilation channel 12 is arranged in the horizontal direction and is located on the side of the heat storage furnace 4 away from the boiler. One end of the ventilation channel 12 is connected to the cavity 1 71, and the other end is connected to the cavity 2 72. A solenoid valve 13 is provided in the ventilation channel 12 for blocking the inner cavity of the ventilation channel 12, and the solenoid valve 13 is close to the cavity 1 71.

[0043] Reference Figure 4 and Figure 5 The preheating mechanism includes a sleeve 14 and a sealing plate 15. The sleeve 14 is cylindrical, sleeved on the outside of the air intake pipe 3 and fixedly connected to the air intake pipe 3, and a cylindrical preheating chamber 16 is formed between the sleeve 14 and the air intake pipe 3.

[0044] Reference Figure 4 and Figure 5The sealing plate 15 is a circular plate. Two sealing plates 15 are provided. A circular plug interface is opened in the center of the sealing plate 15. The sealing plate 15 is sleeved on the air inlet pipe 3 in a direction perpendicular to the air inlet pipe 3. The two sealing plates 15 cover the openings at both ends of the preheating chamber 16.

[0045] Reference Figure 4 and Figure 5 An annular groove 17 is provided on the pipe wall of the air inlet pipe 3 , and an elastic pad 18 is fixedly connected to the inner wall of the plug interface. The elastic pad 18 is arranged in a circular ring shape and is plugged in the annular groove 17 .

[0046] Reference Figure 4 and Figure 5 An air inlet port 19 is provided on one side of the sleeve 14 close to the heat storage furnace 4, and the air inlet port 19 is connected to the preheating chamber 16. A heat outlet pipe 20 is connected between the air inlet port 19 and the air outlet port 9, and the heat outlet pipe 20 is a copper pipe.

[0047] Reference Figure 4 and Figure 5 The sleeve 14 is provided with an air outlet port 21 , the air outlet port 21 is connected with an air outlet pipe, and the air outlet pipe is provided with an electromagnetic valve 23 for blocking the air outlet port 21 .

[0048] The implementation principle of the embodiment is as follows: when the exhaust gas is discharged from the exhaust pipe 2, the first method is to use the cylinder 11 to push the baffle 6 so that the baffle 6 covers the bag opening of the elastic leather bag 5. At this time, the solenoid valve 13 remains in an open state, and the exhaust gas directly enters the ventilation flow channel 12 through the ventilation cavity 7 and enters the preheating cavity 16 through the gas outlet 9. At this time, when the low-temperature gas passes through the intake pipe 3, the intake pipe 3 is directly heated;

[0049] The second method is to separate the baffle 6 from the bag mouth of the elastic leather bag 5, and the solenoid valve 13 is in a closed state. At this time, when the gas enters the ventilation cavity 7 through the heat recovery pipe 10, as the gas continues to increase, the volume of the elastic leather bag 5 is continuously expanded. At this time, the exhaust gas with heat can be temporarily stored in the cavity 1 71. When it is necessary to preheat the intake pipe 3, the solenoid valve 13 is opened. At this time, the gas in the cavity 1 71 can enter the cavity 2 72 through the ventilation flow channel 12 and enter the preheating cavity 16. At the same time, when the solenoid valve 13 is opened, there is an air pressure difference between the cavity 1 71 and the cavity 2 72. The air pressure can push the elastic leather bag 5, prompting the high-temperature exhaust gas in the elastic leather bag 5 to continuously enter the preheating cavity 16, thereby achieving the same effect of heating the intake pipe 3.

[0050] 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 boiler flue gas waste heat recovery and utilization device, Features: The invention relates to a heat storage device, comprising a heat temporary storage mechanism arranged on a furnace body (1) and a preheating mechanism arranged on an air inlet pipe (3); a heat regeneration pipe (10) is connected through the heat storage mechanism and the exhaust pipe (2); a heat outlet pipe (20) is connected through the heat storage mechanism and the preheating mechanism; a preheating cavity (16) is formed between the preheating mechanism and the air inlet pipe (3); the heat temporary storage mechanism comprises a heat storage furnace (4), an elastic leather bag (5) arranged in the heat storage furnace (4), a baffle (6) slidably connected in the heat storage furnace (4), and a pushing component arranged on the heat storage furnace (4) for pushing the baffle (6) to move; a ventilation cavity (7) is provided in the heat storage furnace (4); an air inlet (8) and an air outlet (9) which pass through the ventilation cavity (7) are provided on the heat storage furnace (4); the heat regeneration pipe (10) is connected through the air inlet (8) and the exhaust pipe (2); the heat outlet pipe (20) passes through the heat storage furnace (4); The elastic leather bag (5) is connected to the preheating mechanism and the air outlet (9), the bag opening of the elastic leather bag (5) faces the air inlet (8), the bag opening side wall of the elastic leather bag (5) is fixedly connected to the inner wall of the ventilation cavity (7), the elastic leather bag (5) divides the ventilation cavity (7) into a cavity 1 (71) and a cavity 2 (72) which are not connected to each other, the heat recovery pipe (10) of the cavity 1 (71) passes through, and the heat outlet pipe (20) of the cavity 2 (72) passes through. A ventilation channel (12) is provided on the inner wall of the heat storage furnace (4), one end of the ventilation channel (12) is connected to the first cavity (71), and the other end is connected to the second cavity (72). The ventilation channel (12) is provided with a solenoid valve (13) for sealing the inner cavity of the ventilation channel (12). The baffle (6) is arranged in a direction perpendicular to the inner wall of the furnace body (1), and the baffle (6) can be slidably blocked at the bag opening of the elastic leather bag (5).

2. The boiler flue gas waste heat recovery and utilization device according to claim 1, Features: The inner wall of the elastic leather bag (5) is coated with a high temperature resistant paint.

3. The boiler flue gas waste heat recovery and utilization device according to claim 1, Features: The pushing assembly comprises a cylinder (11), the cylinder (11) is arranged in a direction perpendicular to the side wall of the heat storage furnace (4), and the piston rod of the cylinder (11) is fixedly connected to the baffle (6).

4. The boiler flue gas waste heat recovery and utilization device according to claim 1, Features: The outer side wall of the heat storage furnace (4) is wrapped with a heat insulation pad (22).

5. The boiler flue gas waste heat recovery and utilization device according to claim 1, Features: The preheating mechanism comprises a sleeve (14) and a sealing plate (15); the sleeve (14) is sleeved on the outer side of the air intake pipe (3); a preheating chamber (16) is formed between the sleeve (14) and the air intake pipe (3); the sealing plate (15) is sleeved on the air intake pipe (3) and covers the openings at both ends of the preheating chamber (16); the sealing plate (15) is arranged in a direction perpendicular to the air intake pipe (3); an air intake port (19) is provided on the sleeve (14); the heat outlet pipe (20) is connected to the air intake port (19); an air outlet port (21) is provided on the sleeve (14); and a solenoid valve (23) for sealing the air outlet port (21) is arranged on the air outlet port (21).

6. The boiler flue gas waste heat recovery and utilization device according to claim 5, Features: An elastic pad (18) is fixedly connected to the side wall of the sealing plate (15) that contacts the air intake pipe (3), and the elastic pad (18) contacts the pipe wall of the air intake pipe (3).

7. The boiler flue gas waste heat recovery and utilization device according to claim 6, Features: An annular groove (17) is provided on the wall of the air inlet pipe (3), and the elastic pad (18) is plugged in the annular groove (17).

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