Boiler flue with exhaust heat recycling device

Abstract

The utility model discloses a boiler flue with a smoke exhaust heat recycling device, which comprises a boiler flue main body, a first door-shaped branch pipe, a controller and a temperature detector are fixed on the outer wall of the boiler flue main body, and the temperature detector is positioned on one side of the first door-shaped branch pipe. An air preheater is arranged at the position, between the two ends of the first door-shaped branch pipe, of the boiler flue body in a penetrating mode, a first air-smoke heat exchanger and a second air-smoke heat exchanger are arranged on a pipeline, parallel to the boiler flue body, of the first door-shaped branch pipe, and an air supply device is arranged between the first door-shaped branch pipe and the boiler flue body. An air outlet of the air supply device faces the end, away from the temperature detector, of the boiler flue body. The controller is electrically connected with the temperature detector, the air preheater, the first air-smoke heat exchanger, the second air-smoke heat exchanger and the air supply device. The boiler smoke heat recycling device can recycle boiler smoke heat, reduce boiler coal consumption, heat air entering the fan, optimize combustion working conditions, reduce steam consumption of the air heater and improve steam supply quantity.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of flue gas heat recovery equipment, and relates to a boiler flue with a flue gas heat recovery and utilization device. BACKGROUND

[0002] In the production process of boilers applied in the fields of thermal power generation, chemical industry and the like, in order to improve the temperature of primary air and secondary air sent into the boiler and improve the thermal efficiency of the boiler, a warm air heater is arranged at the inlet of a primary air fan and a secondary air fan, air entering the fan is exchanged with auxiliary steam to improve the air temperature, meanwhile, due to design or operation reasons, the flue gas temperature of many boilers is high, which causes excessive flue gas heat loss of the boiler and affects the efficiency of the boiler, if the flue gas heat loss is used to heat air entering the fan, the flue gas temperature of the boiler can be reduced to the design level, the efficiency of the boiler is improved, the air temperature entering the furnace is improved, the coal powder is heated and dried, the coal powder is more easily ignited, the combustion condition is optimized, the auxiliary steam consumption of the warm air heater is reduced, the steam supply is improved, and the economy of the whole unit is optimized. SUMMARY

[0003] The utility model discloses a boiler flue with a flue gas heat recovery and utilization device, which solves the problem of flue gas heat loss in the prior art and cannot be used to heat air entering the fan.

[0004] The utility model discloses a technical scheme that a boiler flue with a flue gas heat recovery and utilization device, including the boiler flue main part, the first door type branch pipe, controller, temperature measurer are fixed on the outer wall of boiler flue main part, temperature measurer is located first door type branch pipe one side, the air preheater is passed through and is arranged on the position between both ends of first door type branch pipe of boiler flue main part, first door type branch pipe and boiler flue main part parallel pipe way on the setting has first air flue gas heat exchanger and second air flue gas heat exchanger, first door type branch pipe and boiler flue main part between setting has the air supply device, the air supply device air outlet is towards the end of boiler flue main part far away from temperature measurer, and controller is connected with temperature measurer, air preheater, first air flue gas heat exchanger, second air flue gas heat exchanger, air supply device electricity respectively.

[0005] The utility model discloses a boiler flue with a flue gas heat recovery and utilization device, which solves the problem of flue gas heat loss in the prior art and cannot be used to heat air entering the fan.

[0006] The first door type branch pipe is provided with a first shut-off valve near one end and a second shut-off valve near the other end, and the controller is electrically connected with the first shut-off valve and the second shut-off valve respectively.

[0007] The first door type branch pipe pipe line where the first shut-off valve is arranged is provided with an adjusting valve, and the adjusting valve is communicatively connected with the temperature measurer.

[0008] The first door type branch pipe is provided with first isolation valves at positions close to both sides of the first air-steam heat exchanger.

[0009] The first door type branch pipe is provided with second isolation valves at positions close to both sides of the second air-steam heat exchanger.

[0010] The first door type branch pipe, on which the first air-steam heat exchanger is located, is fixed with a second door type branch pipe at a side away from the main body of the boiler flue, the first air-steam heat exchanger and the two first isolation valves are located between both ends of the second door type branch pipe, the second door type branch pipe is provided with a third shut-off valve, and the third shut-off valve is electrically connected with the controller.

[0011] The first door type branch pipe, on which the second air-steam heat exchanger is located, is fixed with a third door type branch pipe at a side away from the main body of the boiler flue, the second air-steam heat exchanger and the two second isolation valves are located between both ends of the third door type branch pipe, the third door type branch pipe is provided with a fourth shut-off valve, and the fourth shut-off valve is electrically connected with the controller.

[0012] The first air-steam heat exchanger is internally provided with a plurality of first flue gas pipes parallel to the main body of the boiler flue, the second air-steam heat exchanger is internally provided with a plurality of second flue gas pipes parallel to the main body of the boiler flue, and the inlets of the primary air fan and the air supply fan are both directed towards the main body of the boiler flue.

[0013] The air supply device comprises the primary air fan and the first air-steam heat exchanger, the primary air fan is provided with a primary air fan air inlet at a side close to the first air-steam heat exchanger and a primary air fan air outlet at a side away from the first air-steam heat exchanger, a first warm air generator is arranged between the primary air fan and the first air-steam heat exchanger, the air supply device further comprises the air supply fan and the second air-steam heat exchanger, the air supply fan is provided with an air supply fan air inlet at a side close to the second air-steam heat exchanger and an air supply fan air outlet at a side away from the second air-steam heat exchanger, a second warm air generator is arranged between the air supply fan and the second air-steam heat exchanger, and the primary air fan air outlet and the air supply fan air outlet are both directed towards an end of the main body of the boiler flue away from the temperature detector.

[0014] The air supply device comprises the primary air fan and the first air-steam heat exchanger, the primary air fan is provided with a primary air fan air inlet at a side close to the first air-steam heat exchanger and a primary air fan air outlet at a side away from the first air-steam heat exchanger, a first warm air generator is arranged between the primary air fan and the first air-steam heat exchanger, the air supply device further comprises the air supply fan and the second air-steam heat exchanger, the air supply fan is provided with an air supply fan air inlet at a side close to the second air-steam heat exchanger and an air supply fan air outlet at a side away from the second air-steam heat exchanger, a second warm air generator is arranged between the air supply fan and the second air-steam heat exchanger, and the primary air fan air outlet and the air supply fan air outlet are both directed towards an end of the main body of the boiler flue away from the temperature detector.

[0015] Compared with the prior art, the air supply device with the smoke heat recovery and utilization device of the utility model re-sends part of heat discharged by the air-steam heat exchanger to the boiler through the air supply device, effectively recovers and utilizes the boiler smoke heat, reduces the boiler coal consumption, the heat emitted by the air-steam heat exchanger can heat the air entering the fan, optimizes the combustion condition, simultaneously reduces the steam consumption of the warm air generator, improves the steam supply, and improves the overall economy of the unit. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1The utility model provides a boiler flue with smoke exhaust heat recycling device's structure diagram.

[0017] In the drawing, 1. boiler flue main part, 2. first shutoff valve, 3. regulating valve, 4. air preheater, 5. second shutoff valve, 6. temperature detector, 7. first door type branch pipe, 8. third shutoff valve, 9. second door type branch pipe, 10. first air and smoke heat exchanger, 101. first flue gas pipeline, 11. first isolation valve, 12. fourth shutoff valve, 13. third door type branch pipe, 14. second air and smoke heat exchanger, 141. second flue gas pipeline, 15. second isolation valve, 16. second air heater, 17. air supply fan, 171. air supply fan air inlet, 172. air supply fan air outlet, 18. first air heater, 19. primary air fan, 191. primary air fan air inlet, 192. primary air fan air outlet, 20. controller. DETAILED DESCRIPTION

[0018] The utility model will be described in detail below in combination with the drawings and specific embodiment.

[0019] The boiler flue with smoke exhaust heat recycling device refers to Figure 1 , including boiler flue main part 1, the first door type branch pipe 7, controller 20, temperature detector 6 are fixed on the outer wall of boiler flue main part 1, temperature detector 6 is located in the side of first door type branch pipe 7, air preheater 4 is set up in the position between the both ends of first door type branch pipe 7 on boiler flue main part 1, first door type branch pipe 7 and the pipeline in parallel of boiler flue main part 1 are provided with first air and smoke heat exchanger 10 and second air and smoke heat exchanger 14, first door type branch pipe 7 and boiler flue main part 1 are provided with air supply device, and the air outlet of air supply device is towards the end of boiler flue main part 1 away from temperature detector 6, and controller 20 is electrically connected with temperature detector 6, air preheater 4, first air and smoke heat exchanger 10, second air and smoke heat exchanger 14, air supply device respectively.

[0020] The first gate type branch pipe 7 is provided with a first shutoff valve 2 near one end and a second shutoff valve 5 near the other end, and a controller 20 is electrically connected with the first shutoff valve 2 and the second shutoff valve 5 respectively, so that the whole first gate type branch pipe 7 can be isolated from the boiler flue main body 1 during shutdown or maintenance, and the first gate type branch pipe 7 is provided with an adjusting valve 3 near the first shutoff valve 2, the adjusting valve 3 is in communication connection with a temperature detector 6, the temperature detector 6 can detect the exhaust gas temperature in real time and control the adjusting valve 3 to adjust the amount of flue gas entering the first gate type branch pipe 7, or the adjusting valve 3 can be manually operated to adjust the amount of flue gas in the first gate type branch pipe 7; the first gate type branch pipe 7 is provided with a first isolation valve 11 near both sides of a first air flue heat exchanger 10, and the first isolation valve 11 is electrically connected with the controller 20; the first gate type branch pipe 7 is provided with a second isolation valve 15 near both sides of a second air flue heat exchanger 14, and the second isolation valve 15 is electrically connected with the controller 20.

[0021] The first gate type branch pipe 7 is provided with a second gate type branch pipe 9 fixed on the side far away from the boiler flue main body 1, the first air flue heat exchanger 10 and the two first isolation valves 11 are located between the two ends of the second gate type branch pipe 9, the second gate type branch pipe 9 is provided with a third shutoff valve 8, the third shutoff valve 8 is electrically connected with the controller 20, the first gate type branch pipe 7 is provided with a third gate type branch pipe 13 fixed on the side far away from the boiler flue main body 1, the second air flue heat exchanger 14 and the two second isolation valves 15 are located between the two ends of the third gate type branch pipe 13, the third gate type branch pipe 13 is provided with a fourth shutoff valve 12, the fourth shutoff valve 12 is electrically connected with the controller 20, the third shutoff valve 8 and the fourth shutoff valve 12 are in a closed state, when one air flue heat exchanger is shut down or under maintenance, the corresponding bypass is opened, so that the air flue heat exchanger can be isolated without affecting the normal operation of other air flue heat exchangers; the first air flue heat exchanger 10 is provided with a plurality of first flue gas pipes 101 parallel to the boiler flue main body 1, and the second air flue heat exchanger 14 is provided with a plurality of second flue gas pipes 141 parallel to the boiler flue main body 1, the flue gas pipes facilitate the flow of flue gas and heat exchange with the air flowing outside, and the inlet of the primary air fan 19 and the inlet of the air supply fan 17 are both directed to the boiler flue main body 1.

[0022] The air supply device comprises a primary air blower 19, the primary air blower 19 is located on the same horizontal line with the first air flue gas heat exchanger 10, the primary air blower 19 is provided with a primary air blower air inlet 191 on the side close to the first air flue gas heat exchanger 10, the primary air blower 19 is provided with a primary air blower air outlet 192 on the side away from the first air flue gas heat exchanger 10, a first air heater 18 is arranged between the primary air blower 19 and the first air flue gas heat exchanger 10, the air supply device further comprises an air supply blower 17, the air supply blower 17 is located on the same horizontal line with the second air flue gas heat exchanger 14, the air supply blower 17 is provided with an air supply blower air inlet 171 on the side close to the second air flue gas heat exchanger 14, the air supply blower 17 is provided with an air supply blower air outlet 172 on the side away from the second air flue gas heat exchanger 14, a second air heater 16 is arranged between the air supply blower 17 and the second air flue gas heat exchanger 14, the primary air blower air outlet 192 and the air supply blower air outlet 172 are both directed to the end of the boiler flue main body 1 away from the temperature detector 6.

[0023] The working principle of the utility model is:

[0024] The end of the boiler flue main body 1 away from the temperature detector 6 is connected to the boiler, flue gas from the boiler enters the boiler flue main body 1, part of the flue gas enters the first door type branch pipe 7, and then exchanges heat with air of the first air flue gas heat exchanger 10 and the second air flue gas heat exchanger 14 in turn, and then the heat is sent back to the boiler through the air supply device, the heat dissipated by the air flue gas heat exchanger can heat the air entering the air blower, optimize the combustion condition, and reduce the steam consumption of the air heater.

[0025] Embodiment 1:

[0026] The boiler flue with the flue gas heat recovery device comprises a boiler flue main body 1, a first door type branch pipe 7, a controller 20 and a temperature detector 6 are fixed on the outer wall of the boiler flue main body 1, the temperature detector 6 is located on the side of the first door type branch pipe 7, an air preheater 4 is arranged on the boiler flue main body 1 and penetrates the position between the two ends of the first door type branch pipe 7, the first air flue gas heat exchanger 10 and the second air flue gas heat exchanger 14 are arranged on the pipeline parallel to the first door type branch pipe 7 and the boiler flue main body 1, an air supply device is arranged between the first door type branch pipe 7 and the boiler flue main body 1, the air supply device air outlet is directed to the end of the boiler flue main body 1 away from the temperature detector 6, and the controller 20 is electrically connected with the temperature detector 6, the air preheater 4, the first air flue gas heat exchanger 10, the second air flue gas heat exchanger 14 and the air supply device.

[0027] The first gate branch pipe 7 is provided with a first shutoff valve 2 near one end, a second shutoff valve 5 near the other end, and a controller 20 is electrically connected with the first shutoff valve 2 and the second shutoff valve 5 respectively. The first gate branch pipe 7 is provided with a first isolation valve 11 near both sides of the first air flue gas heat exchanger 10, and the first isolation valve 11 is electrically connected with the controller 20. The first gate branch pipe 7 is provided with a second isolation valve 15 near both sides of the second air flue gas heat exchanger 14, and the second isolation valve 15 is electrically connected with the controller 20. The first air flue gas heat exchanger 10 and the two first isolation valves 11 are located between both ends of the second gate branch pipe 9 fixed on the first gate branch pipe 7 away from one side of the boiler flue main body 1. The second gate branch pipe 9 is provided with a third shutoff valve 8, and the third shutoff valve 8 is electrically connected with the controller 20. The second air flue gas heat exchanger 14 and the two second isolation valves 15 are located between both ends of the third gate branch pipe 13 fixed on the first gate branch pipe 7 away from one side of the boiler flue main body 1. The third gate branch pipe 13 is provided with a fourth shutoff valve 12, and the fourth shutoff valve 12 is electrically connected with the controller 20.

[0028] Embodiment 2:

[0029] The boiler flue with the flue gas heat recovery device comprises a boiler flue main body 1, a first gate branch pipe 7, a controller 20 and a temperature detector 6 fixed on the outer wall of the boiler flue main body 1. The temperature detector 6 is located on one side of the first gate branch pipe 7. An air preheater 4 is arranged on the boiler flue main body 1 between both ends of the first gate branch pipe 7. The first gate branch pipe 7 is provided with a first air flue gas heat exchanger 10 and a second air flue gas heat exchanger 14 in parallel with the boiler flue main body 1. An air supply device is arranged between the first gate branch pipe 7 and the boiler flue main body 1, and the air outlet of the air supply device is directed to the end of the boiler flue main body 1 away from the temperature detector 6. The controller 20 is electrically connected with the temperature detector 6, the air preheater 4, the first air flue gas heat exchanger 10, the second air flue gas heat exchanger 14 and the air supply device respectively.

[0030] The first door type branch pipe 7 is provided with a first isolation valve 11 near both sides of the first air- smoke heat exchanger 10, the first isolation valve 11 is electrically connected with the controller 20, the first door type branch pipe 7 is provided with a second isolation valve 15 near both sides of the second air- smoke heat exchanger 14, the second isolation valve 15 is electrically connected with the controller 20, the first door type branch pipe 7 is fixed with the second door type branch pipe 9 away from one side of the boiler flue main body 1, the first air- smoke heat exchanger 10 and the two first isolation valves 11 are located between both ends of the second door type branch pipe 9, the second door type branch pipe 9 is provided with a third shut-off valve 8, the third shut-off valve 8 is electrically connected with the controller 20, the first door type branch pipe 7 is fixed with the third door type branch pipe 13 away from one side of the boiler flue main body 1, the second air- smoke heat exchanger 14 and the two second isolation valves 15 are located between both ends of the third door type branch pipe 13, the third door type branch pipe 13 is provided with a fourth shut-off valve 12, the fourth shut-off valve 12 is electrically connected with the controller 20, the first air- smoke heat exchanger 10 is internally provided with six first smoke gas pipes 101 parallel to the boiler flue main body 1, the second air- smoke heat exchanger 14 is internally provided with six second smoke gas pipes 141 parallel to the boiler flue main body 1, the inlet of the primary air fan 19 and the air supply fan 17 are both towards the boiler flue main body 1.

[0031] The air supply device comprises the primary air fan 19, the primary air fan 19 is located on the same horizontal line as the first air- smoke heat exchanger 10, the primary air fan 19 is provided with a primary air fan air inlet 191 near one side of the first air- smoke heat exchanger 10, the primary air fan 19 is provided with a primary air fan air outlet 192 away from one side of the first air- smoke heat exchanger 10, the primary air fan 19 and the first air- smoke heat exchanger 10 are provided with the first warm air machine 18, the air supply device further comprises the air supply fan 17, the air supply fan 17 is located on the same horizontal line as the second air- smoke heat exchanger 14, the air supply fan 17 is provided with an air supply fan air inlet 171 near one side of the second air- smoke heat exchanger 14, the air supply fan 17 is provided with an air supply fan air outlet 172 away from one side of the second air- smoke heat exchanger 14, the air supply fan 17 and the second air- smoke heat exchanger 14 are provided with the second warm air machine 16, the primary air fan air outlet 192 and the air supply fan air outlet 172 are both towards one end of the boiler flue main body 1 away from the temperature detector 6.

[0032] Example 3:

[0033] The boiler flue with flue gas heat recovery device comprises a boiler flue body 1, a first door-shaped branch pipe 7, a controller 20 and a temperature detector 6 fixed on the outer wall of the boiler flue body 1, the temperature detector 6 is located on one side of the first door-shaped branch pipe 7, an air preheater 4 is arranged through the position between the two ends of the first door-shaped branch pipe 7 on the boiler flue body 1, the first door-shaped branch pipe 7 is provided with a first air and flue gas heat exchanger 10 and a second air and flue gas heat exchanger 14 on the pipeline parallel to the boiler flue body 1, an air supply device is arranged between the first door-shaped branch pipe 7 and the boiler flue body 1, the air outlet of the air supply device is directed to the end of the boiler flue body 1 away from the temperature detector 6, and the controller 20 is electrically connected with the temperature detector 6, the air preheater 4, the first air and flue gas heat exchanger 10, the second air and flue gas heat exchanger 14 and the air supply device.

[0034] A first shutoff valve 2 is arranged on the first door-shaped branch pipe 7 close to one end, a second shutoff valve 5 is arranged close to the other end, the controller 20 is electrically connected with the first shutoff valve 2 and the second shutoff valve 5, a regulating valve 3 is arranged on the pipeline of the first door-shaped branch pipe 7 where the first shutoff valve 2 is located, the regulating valve 3 is in communication connection with the temperature detector 6, a second isolation valve 15 is arranged on the first door-shaped branch pipe 7 close to the two sides of the second air and flue gas heat exchanger 14, the second isolation valve 15 is electrically connected with the controller 20, a third door-shaped branch pipe 13 is fixed on the side of the pipeline of the first door-shaped branch pipe 7 where the second air and flue gas heat exchanger 14 is located and away from the boiler flue body 1, the second air and flue gas heat exchanger 14 and the two second isolation valves 15 are located between the two ends of the third door-shaped branch pipe 13, a fourth shutoff valve 12 is arranged on the third door-shaped branch pipe 13, the fourth shutoff valve 12 is electrically connected with the controller 20, seven first flue gas pipes 101 parallel to the boiler flue body 1 are arranged in the first air and flue gas heat exchanger 10, seven second flue gas pipes 141 parallel to the boiler flue body 1 are arranged in the second air and flue gas heat exchanger 14, and the inlets of the primary air fan 19 and the air supply fan 17 are directed to the boiler flue body 1.

[0035] The air supply device comprises the primary air fan 19, the primary air fan 19 and the first air and flue gas heat exchanger 10 are located on the same horizontal line, a primary air fan air inlet 191 is arranged on the side of the primary air fan 19 close to the first air and flue gas heat exchanger 10, a primary air fan air outlet 192 is arranged on the side of the primary air fan 19 away from the first air and flue gas heat exchanger 10, a first warm air fan 18 is arranged between the primary air fan 19 and the first air and flue gas heat exchanger 10, the air supply device further comprises the air supply fan 17, the air supply fan 17 and the second air and flue gas heat exchanger 14 are located on the same horizontal line, an air supply fan air inlet 171 is arranged on the side of the air supply fan 17 close to the second air and flue gas heat exchanger 14, an air supply fan air outlet 172 is arranged on the side of the air supply fan 17 away from the second air and flue gas heat exchanger 14, a second warm air fan 16 is arranged between the air supply fan 17 and the second air and flue gas heat exchanger 14, and the primary air fan air outlet 192 and the air supply fan air outlet 172 are both directed to the end of the boiler flue body 1 away from the temperature detector 6.

[0036] Embodiment 4:

[0037] The boiler flue with flue gas heat recovery device comprises a boiler flue body 1, a first door-shaped branch pipe 7, a controller 20 and a temperature detector 6 are fixed on the outer wall of the boiler flue body 1, the temperature detector 6 is located on one side of the first door-shaped branch pipe 7, an air preheater 4 is arranged through the position between the two ends of the first door-shaped branch pipe 7 on the boiler flue body 1, the first door-shaped branch pipe 7 is provided with a first air and flue gas heat exchanger 10 and a second air and flue gas heat exchanger 14 in parallel with the pipeline of the boiler flue body 1, an air supply device is arranged between the first door-shaped branch pipe 7 and the boiler flue body 1, the air outlet of the air supply device is directed away from the end of the boiler flue body 1 away from the temperature detector 6, and the controller 20 is electrically connected with the temperature detector 6, the air preheater 4, the first air and flue gas heat exchanger 10, the second air and flue gas heat exchanger 14 and the air supply device respectively.

[0038] A first shutoff valve 2 is arranged on the first door-shaped branch pipe 7 close to one end, a second shutoff valve 5 is arranged close to the other end, the controller 20 is electrically connected with the first shutoff valve 2 and the second shutoff valve 5 respectively, an adjusting valve 3 is arranged on the pipeline of the first door-shaped branch pipe 7 where the first shutoff valve 2 is located, the adjusting valve 3 is in communication connection with the temperature detector 6, a first isolation valve 11 is arranged on the first door-shaped branch pipe 7 close to the two sides of the first air and flue gas heat exchanger 10, the first isolation valve 11 is electrically connected with the controller 20, a second door-shaped branch pipe 9 is fixed on the pipeline of the first door-shaped branch pipe 7 where the first air and flue gas heat exchanger 10 is located away from the boiler flue body 1, the first air and flue gas heat exchanger 10 and the two first isolation valves 11 are located between the two ends of the second door-shaped branch pipe 9, a third shutoff valve 8 is arranged on the second door-shaped branch pipe 9, the third shutoff valve 8 is electrically connected with the controller 20, eight first flue gas pipes 101 parallel to the boiler flue body 1 are arranged in the first air and flue gas heat exchanger 10, eight second flue gas pipes 141 parallel to the boiler flue body 1 are arranged in the second air and flue gas heat exchanger 14, and the inlets of the primary air fan 19 and the air supply fan 17 are directed towards the boiler flue body 1.

[0039] The air supply device comprises a primary air blower 19, which is located on the same horizontal line as the first air flue gas heat exchanger 10. The primary air blower 19 is provided with a primary air blower air inlet 191 on the side close to the first air flue gas heat exchanger 10, and is provided with a primary air blower air outlet 192 on the side away from the first air flue gas heat exchanger 10. The first air flue gas heat exchanger 10 is provided between the primary air blower 19 and the first air flue gas heat exchanger 10. The air supply device further comprises an air supply blower 17, which is located on the same horizontal line as the second air flue gas heat exchanger 14. The air supply blower 17 is provided with an air supply blower air inlet 171 on the side close to the second air flue gas heat exchanger 14, and is provided with an air supply blower air outlet 172 on the side away from the second air flue gas heat exchanger 14. The second air flue gas heat exchanger 14 is provided between the air supply blower 17 and the second air flue gas heat exchanger 14. The primary air blower air outlet 192 and the air supply blower air outlet 172 are both directed away from the temperature detector 6 at the end of the boiler flue main body 1.

[0040] Embodiment 5:

[0041] The boiler flue with the flue gas heat recovery device comprises a boiler flue main body 1, a first door-shaped branch pipe 7, a controller 20 and a temperature detector 6 fixed on the outer wall of the boiler flue main body 1. The temperature detector 6 is located on one side of the first door-shaped branch pipe 7. An air preheater 4 is provided through the position between the two ends of the first door-shaped branch pipe 7 on the boiler flue main body 1. The first air flue gas heat exchanger 10 and the second air flue gas heat exchanger 14 are provided on the pipeline parallel to the boiler flue main body 1. An air supply device is provided between the first door-shaped branch pipe 7 and the boiler flue main body 1. The air supply device air outlet is directed away from the temperature detector 6 at the end of the boiler flue main body 1. The controller 20 is electrically connected with the temperature detector 6, the air preheater 4, the first air flue gas heat exchanger 10, the second air flue gas heat exchanger 14 and the air supply device, respectively.

[0042] The first gate branch pipe 7 is provided with a first shutoff valve 2 near one end and a second shutoff valve 5 near the other end, and the controller 20 is electrically connected with the first shutoff valve 2 and the second shutoff valve 5 respectively. The first gate branch pipe 7 is provided with an adjusting valve 3 near the first flue gas heat exchanger 10, and the adjusting valve 3 is in communication connection with the temperature detector 6. The first gate branch pipe 7 is provided with a first isolation valve 11 near both sides of the first flue gas heat exchanger 10, and the first isolation valve 11 is electrically connected with the controller 20. The first gate branch pipe 7 is provided with a second isolation valve 15 near both sides of the second flue gas heat exchanger 14, and the second isolation valve 15 is electrically connected with the controller 20. The first flue gas heat exchanger 10 and the two first isolation valves 11 are located between both ends of the second gate branch pipe 9 fixed on the first gate branch pipe 7 away from the boiler flue main body 1. The second gate branch pipe 9 is provided with a third shutoff valve 8, and the third shutoff valve 8 is electrically connected with the controller 20. The second flue gas heat exchanger 14 and the two second isolation valves 15 are located between both ends of the third gate branch pipe 13 fixed on the first gate branch pipe 7 away from the boiler flue main body 1. The third gate branch pipe 13 is provided with a fourth shutoff valve 12, and the fourth shutoff valve 12 is electrically connected with the controller 20.

[0043] The air supply device comprises a primary air blower 19 located on the same horizontal line as the first flue gas heat exchanger 10. The primary air blower 19 is provided with a primary air blower air inlet 191 near one side of the first flue gas heat exchanger 10 and a primary air blower air outlet 192 away from the other side of the first flue gas heat exchanger 10. The primary air blower 19 and the first flue gas heat exchanger 10 are provided with a first warm air blower 18 therebetween. The air supply device further comprises an air supply blower 17 located on the same horizontal line as the second flue gas heat exchanger 14. The air supply blower 17 is provided with an air supply blower air inlet 171 near one side of the second flue gas heat exchanger 14 and an air supply blower air outlet 172 away from the other side of the second flue gas heat exchanger 14. The air supply blower 17 and the second flue gas heat exchanger 14 are provided with a second warm air blower 16 therebetween. The primary air blower air outlet 192 and the air supply blower air outlet 172 are both directed to the end of the boiler flue main body 1 away from the temperature detector 6.

[0044] Embodiment 6:

[0045] The utility model provides a boiler flue with flue gas heat recovery device, including boiler flue main body 1, first door type branch pipe 7, controller 20, temperature detector 6 are fixed on the outer wall of boiler flue main body 1, temperature detector 6 is located first door type branch pipe 7 one side, air preheater 4 is set up in the position between the both ends of first door type branch pipe 7 on boiler flue main body 1, first door type branch pipe 7 and the pipeline of parallel boiler flue main body 1 is provided with first air -preheater 10 and second air -preheater 14, first door type branch pipe 7 and boiler flue main body 1 between be provided with air supply device, air supply device air outlet is towards the end of boiler flue main body 1 away from temperature detector 6, controller 20 is connected with temperature detector 6, air preheater 4, first air -preheater 10, second air -preheater 14, air supply device electricity respectively.

[0046] First door type branch pipe 7 is provided with first shutoff valve 2 on the position close to one end, is provided with second shutoff valve 5 on the position close to the other end, and controller 20 is connected with first shutoff valve 2 and second shutoff valve 5 electricity respectively, and first shutoff valve 2 is provided with regulating valve 3 on the pipeline of first door type branch pipe 7, and regulating valve 3 is connected with temperature detector 6 communication, and first door type branch pipe 7 is provided with first isolation valve 11 on the position close to the both sides of first air -preheater 10, and first isolation valve 11 is connected with controller 20 electricity, and first door type branch pipe 7 is provided with second isolation valve 15 on the position close to the both sides of second air -preheater 14, and second isolation valve 15 is connected with controller 20 electricity, and first air -preheater 10 is fixed with second door type branch pipe 9 on the side of the pipeline of first door type branch pipe 7 away from boiler flue main body 1, and first air -preheater 10 and two first isolation valve 11 are located between the both ends of second door type branch pipe 9, and second door type branch pipe 9 is provided with third shutoff valve 8, and third shutoff valve 8 is connected with controller 20 electricity, and second air -preheater 14 is fixed with third door type branch pipe 13 on the side of the pipeline of first door type branch pipe 7 away from boiler flue main body 1, and second air -preheater 14 and two second isolation valve 15 are located between the both ends of third door type branch pipe 13, and third door type branch pipe 13 is provided with fourth shutoff valve 12, and fourth shutoff valve 12 is connected with controller 20 electricity, and first air -preheater 10 is provided with 9 first flue gas ducts 101 parallel with boiler flue main body 1, and second air -preheater 14 is provided with 9 second flue gas ducts 141 parallel with boiler flue main body 1, and the inlet of primary air fan 19 and air supply fan 17 are all towards boiler flue main body 1.

Claims

1. A boiler flue with an exhaust heat recovery device, characterized in that: The invention comprises a boiler flue main body (1), wherein a first gate-type branch pipe (7), a controller (20), and a temperature detector (6) are fixed on the outer wall of the boiler flue main body (1), wherein the temperature detector (6) is located on one side of the first gate-type branch pipe (7), an air preheater (4) is provided through the position between the two ends of the first gate-type branch pipe (7) on the boiler flue main body (1), a first air-smoke heat exchanger (10) and a second air-smoke heat exchanger (14) are provided on the pipeline parallel to the first gate-type branch pipe (7) and the boiler flue main body (1), an air supply device is provided between the first gate-type branch pipe (7) and the boiler flue main body (1), an air outlet of the air supply device is directed toward an end of the boiler flue main body (1) away from the temperature detector (6), and the controller (20) is electrically connected to the temperature detector (6), the air preheater (4), the first air-smoke heat exchanger (10), the second air-smoke heat exchanger (14), and the air supply device respectively.

2. The boiler flue with exhaust heat recovery device according to claim 1 is characterized in that: A first shutoff valve (2) is provided near one end of the first gate-type branch pipe (7), and a second shutoff valve (5) is provided near the other end. The controller (20) is electrically connected to the first shutoff valve (2) and the second shutoff valve (5), respectively.

3. The boiler flue with exhaust heat recovery device according to claim 2 is characterized in that: A regulating valve (3) is provided on the first gate-type branch pipe (7) where the first shut-off valve (2) is located, and the regulating valve (3) is communicatively connected to the temperature detector (6).

4. The boiler flue with exhaust heat recovery device according to claim 1 is characterized in that: A first isolation valve (11) is provided on each side of the first gate-shaped branch pipe (7) close to the first air-smoke heat exchanger (10), and the first isolation valve (11) is electrically connected to the controller (20).

5. The boiler flue with exhaust heat recovery device according to claim 1 is characterized in that: A second isolation valve (15) is provided on each side of the first gate-type branch pipe (7) close to the second air-smoke heat exchanger (14), and the second isolation valve (15) is electrically connected to the controller (20).

6. The boiler flue with exhaust heat recovery device according to claim 4 is characterized in that: A second gate-type branch pipe (9) is fixed on the side of the first gate-type branch pipe (7) where the first air-smoke heat exchanger (10) is located, away from the boiler flue main body (1). The first air-smoke heat exchanger (10) and the two first isolation valves (11) are located between the two ends of the second gate-type branch pipe (9). A third shut-off valve (8) is provided on the second gate-type branch pipe (9), and the third shut-off valve (8) is electrically connected to the controller (20).

7. The boiler flue with exhaust heat recovery device according to claim 5, characterized in that: A third gate-type branch pipe (13) is fixed on the side of the first gate-type branch pipe (7) where the second air-smoke heat exchanger (14) is located, away from the boiler flue main body (1). The second air-smoke heat exchanger (14) and the two second isolation valves (15) are located between the two ends of the third gate-type branch pipe (13). A fourth shut-off valve (12) is provided on the third gate-type branch pipe (13), and the fourth shut-off valve (12) is electrically connected to the controller (20).

8. The boiler flue with exhaust heat recovery device according to claim 1, characterized in that: A plurality of first flue gas ducts (101) parallel to the boiler flue main body (1) are provided inside the first air-smoke heat exchanger (10), a plurality of second flue gas ducts (141) parallel to the boiler flue main body (1) are provided inside the second air-smoke heat exchanger (14), and the inlets of the primary fan (19) and the blower (17) are both oriented toward the boiler flue main body (1).

9. The boiler flue with exhaust heat recovery device according to any one of claims 1 to 8, characterized in that: The air supply device includes a primary fan (19), the primary fan (19) and the first air-smoke heat exchanger (10) are located on the same horizontal line, a primary fan air inlet (191) is provided on the side of the primary fan (19) close to the first air-smoke heat exchanger (10), a primary fan air outlet (192) is provided on the side of the primary fan (19) away from the first air-smoke heat exchanger (10), a first air heater (18) is provided between the primary fan (19) and the first air-smoke heat exchanger (10), and the air supply device also includes an air supply fan (17), the air supply fan (17) 7) is located on the same horizontal line as the second air-smoke heat exchanger (14), a blower air inlet (171) is provided on the side of the blower (17) close to the second air-smoke heat exchanger (14), a blower air outlet (172) is provided on the side of the blower (17) away from the second air-smoke heat exchanger (14), a second air heater (16) is provided between the blower (17) and the second air-smoke heat exchanger (14), and the primary blower air outlet (192) and the blower air outlet (172) are both oriented toward the end of the boiler flue main body (1) away from the temperature detector (6).

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