CN220061818U - Air preheater with high conversion efficiency - Google Patents

Abstract

The utility model discloses an air preheater with high conversion efficiency, which relates to the technical field of preheaters and comprises a preheating box, wherein a plurality of guide plates are arranged in the preheating box, a plurality of heating cavities are arranged between the guide plates, spiral double pipes are arranged in the heating cavities, one side of the preheating box is fixedly and in through connection with a hot air inlet pipe, an external pipe and a cold air inlet pipe, a preheating exhaust pipe and an exhaust gas exhaust pipe are arranged at the lower side of the hot air inlet pipe, and the hot air inlet pipe and the cold air inlet pipe are both fixedly and in through connection with the spiral double pipes; the structure avoids that smoke dust in the boiler directly enters the preheating box through the arranged spiral double pipes, and secondary combustion is carried out by discharging unburned smoke dust into the boiler, so that the waste of fuel is reduced, the transmission pipe containing cold air and the transmission pipe containing hot smoke are in direct contact, the heat exchange efficiency can be improved, and the time for changing the cold air into hot air is accelerated.

Description

Air preheater with high conversion efficiency

Technical Field

The utility model relates to the technical field of preheaters, in particular to an air preheater with high conversion efficiency.

Background

The air preheater is a heating surface which is used for preheating air before entering a boiler to a certain temperature by utilizing flue gas in a tail flue of the boiler through internal radiating fins, is used for improving the heat exchange performance of the boiler and reducing energy consumption, is generally called an air preheater for a coal-fired boiler, but most of the existing preheaters are poor in heat exchange efficiency, no heat is utilized to the maximum, waste on resources is caused, consumption on fuel is increased, the Chinese patent discloses a preheater (authorized publication No. CN 210601708U) with high heat exchange efficiency, the technology can be used for realizing spiral air pipes, the stay time of cold air in the preheater is longer, the obtained heat is higher, the contact area of the cold air and the air pipes is increased, and more heat is exchanged by the cold air in the same time.

Disclosure of Invention

The present utility model is directed to an air preheater with high conversion efficiency, so as to solve the problems set forth in the background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides an air heater that conversion efficiency is high, includes the preheating cabinet, the internally mounted who preheats the cabinet has a plurality of guide plates, be provided with a plurality of heating chamber between the guide plate, the inside in heating chamber is provided with spiral double-barrelled, one side of preheating cabinet is fixed and link up and be connected with hot air admission pipe, external pipe and cold air admission pipe, the downside of hot air admission pipe is provided with preheats discharge pipe and waste gas discharge pipe, hot air admission pipe and cold air admission pipe are all fixed and link up with spiral double-barrelled being connected, hot air admission pipe link up mutually with the waste gas discharge pipe through spiral double-barrelled, the cold air admission pipe link up mutually with preheats the discharge pipe through spiral double-barrelled.

As still further aspects of the utility model: the spiral double-pipe is formed by spirally winding two groups of transmission pipes, and a supporting frame is arranged at the lower side of the spiral double-pipe and fixedly connected with the guide plate.

As still further aspects of the utility model: wherein, the inner wall laminating of preheating cabinet has the heat preservation pad, and a plurality of heat preservation chambeies have been seted up to the inside of heat preservation pad.

As still further aspects of the utility model: wherein, the internally mounted of preheating cabinet has temperature sensor, and control panel is installed in the outside of preheating cabinet, control panel and temperature sensor electric connection.

As still further aspects of the utility model: wherein, the second air-blower is installed to one side of takeover outward, and cold air admission pipe first air-blower.

As still further aspects of the utility model: the outer side of the preheating box is fixedly connected with a fixed pipe in a penetrating mode, the inside of the fixed pipe is connected with a movable pipe in a sliding mode, the surface side of the movable pipe is provided with a plurality of exhaust holes, and the upper side of the movable pipe is fixedly connected with a limiting plate.

Compared with the prior art, the utility model has the beneficial effects that:

the method comprises the steps that hot air entering pipes are externally connected with hot smoke in a boiler, a first blower is started, external air is sucked into cold air entering pipes, hot smoke of the hot air entering pipes and cold air entering pipes enter spiral double pipes at the same time, as the spiral double pipes are formed by interweaving two groups of transmission pipes which are not mutually communicated in a spiral mode, according to a thermal principle, the transmission pipes containing cold air absorb heat to the transmission pipes containing hot smoke, heat is generated in a preheating box by the transmission pipes containing hot smoke, air in the heating cavity is heated, the inside of the preheating box is kept at a high temperature, therefore, hot air loss in the preheating box is reduced, the preheating effect of the preheating box is improved, a preheating discharge pipe discharges the hot air, an exhaust gas discharge pipe can discharge exhaust smoke into the boiler, and unburned smoke and dust contained in the smoke are combusted for the second time; the structure avoids that smoke dust in the boiler directly enters the preheating box through the arranged spiral double pipes, and secondary combustion is carried out by discharging unburned smoke dust into the boiler, so that the waste of fuel is reduced, the transmission pipe containing cold air and the transmission pipe containing hot smoke are in direct contact, the heat exchange efficiency can be improved, and the time for changing the cold air into hot air is accelerated.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic cross-sectional view of a preheating tank according to the present utility model;

FIG. 3 is a schematic view of a thermal insulation pad according to the present utility model;

FIG. 4 is a schematic cross-sectional view of a spiral double-tube structure according to the present utility model;

the correspondence between the reference numerals and the component names in the drawings is as follows:

1. a preheating box; 2. a hot air inlet pipe; 3. a first blower; 4. a second blower; 5. a fixed tube; 501. a movable tube; 502. a limiting plate; 503. an exhaust hole; 6. a deflector; 7. an outer connecting pipe; 701. a cold air inlet pipe; 8. a support frame; 9. a spiral double tube; 10. a heating chamber; 11. preheating the discharge pipe; 12. an exhaust gas discharge pipe; 13. a thermal insulation pad; 14. a heat preservation cavity; 15. a control panel; 16. a temperature sensor.

Detailed Description

Please refer to fig. 1-4: an air preheater with high conversion efficiency comprises a preheating box 1, a heat preservation pad 13 is attached to the inner wall of the preheating box 1, a plurality of heat preservation cavities 14 are formed in the heat preservation pad 13, a temperature sensor 16 is installed in the preheating box 1, a control panel 15 is installed on the outer side of the preheating box 1, the control panel 15 is electrically connected with the temperature sensor 16, the control panel 15 can know the real-time temperature in the preheating box 1 through the temperature sensor 16, a plurality of guide plates 6 are installed in the preheating box 1, the guide plates 6 are arranged to play a role of heat insulation, the loss of hot air is reduced, a plurality of heating cavities 10 are arranged between the guide plates 6, a spiral double pipe 9 is arranged in the heating cavities 10, the spiral double pipe 9 is formed by spirally winding two groups of transmission pipes, the two groups of non-communicated transmission pipes are spirally interweaved, according to a thermal principle, the transmission pipe containing cold air absorbs heat to the transmission pipe containing hot flue gas, thereby completing heat exchange, the lower side of the spiral double pipe 9 is provided with a supporting frame 8, the supporting frame 8 is fixedly connected with a guide plate 6, one side of the preheating box 1 is fixedly and in through connection with a hot air inlet pipe 2, an external connection pipe 7 and a cold air inlet pipe 701, one side of the external connection pipe 7 is provided with a second blower 4, the cold air inlet pipe 701 is provided with a first blower 3, the first blower 3 can suck external cold air into the cold air inlet pipe 701, the second blower 4 can accelerate the air flow in the preheating box 1 when being started, so that the hot air heated by the spiral double pipe 9 can rapidly heat the preheating box 1, the lower side of the hot air inlet pipe 2 is provided with a preheating outlet pipe 11 and an exhaust gas outlet pipe 12, the hot air inlet pipe 2 and the cold air inlet pipe 701 are fixedly and in through connection with the spiral double pipe 9, the hot air inlet pipe 2 is communicated with the exhaust gas discharge pipe 12 through the spiral double pipe 9, and the cold air inlet pipe 701 is communicated with the preheating discharge pipe 11 through the spiral double pipe 9.

As shown in fig. 1 and 2, the outside of the preheating tank 1 is fixed and is connected with a fixed pipe 5 in a penetrating manner, the inside of the fixed pipe 5 is connected with a movable pipe 501 in a sliding manner, a plurality of exhaust holes 503 are formed in the surface side of the movable pipe 501, a limiting plate 502 is fixedly connected to the upper side of the movable pipe 501, when the air pressure in the preheating tank 1 is too high, the movable pipe 501 is pushed open, the movable pipe 501 moves upwards in the inside of the fixed pipe 5, and the exhaust holes 503 are leaked, so that excessive air in the preheating tank 1 is released.

Working principle: the hot air inlet pipe 2 is externally connected with hot flue gas in a boiler, the first blower 3 is started, external air is sucked into the cold air inlet pipe 701, wherein the hot flue gas of the hot air inlet pipe 2 and the cold air of the cold air inlet pipe 701 can simultaneously enter into the spiral double pipe 9, as the spiral double pipe 9 is formed by spirally interweaving two groups of transmission pipes which are not mutually communicated, according to a thermal principle, the transmission pipes containing the cold air can absorb heat to the transmission pipes containing the hot flue gas, thereby completing heat exchange, the transmission pipes containing the hot flue gas can generate heat in the preheating chamber 1, heat the air in the heating chamber 10, so that the inside of the preheating chamber 1 is kept in a high-temperature state, thereby reducing the loss of the hot air in the preheating chamber 1, improving the preheating effect of the preheating chamber 1, and the waste gas discharge pipe 12 can discharge the waste gas into the boiler, so that unburned smoke dust contained in the smoke and the smoke is combusted for the second time; the structure avoids that smoke dust in the boiler directly enters the preheating box 1 through the spiral double pipe 9, and reduces the waste of fuel by discharging unburned smoke dust into the boiler for secondary combustion, wherein the transmission pipe containing cold air and the transmission pipe containing hot smoke are in direct contact, the heat exchange efficiency can be improved, and the time for changing the cold air into hot air is accelerated.

The foregoing description is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical solution of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (6)

1. The utility model provides an air heater that conversion efficiency is high, includes preheating cabinet (1), a serial communication port, the internally mounted of preheating cabinet (1) has a plurality of guide plates (6), be provided with a plurality of heating chamber (10) between guide plates (6), the inside of heating chamber (10) is provided with spiral double-barrelled (9), one side of preheating cabinet (1) is fixed and link up and be connected with hot air admission pipe (2), external pipe (7) and cold air admission pipe (701), the downside of hot air admission pipe (2) is provided with and preheats discharge pipe (11) and waste gas discharge pipe (12), hot air admission pipe (2) and cold air admission pipe (701) all are fixed and link up with spiral double-barrelled (9), hot air admission pipe (2) link up with waste gas discharge pipe (12) mutually through spiral double-barrelled (9), cold air admission pipe (701) link up with preheats discharge pipe (11) mutually.

2. The high-conversion-efficiency air preheater as set forth in claim 1, wherein the spiral double tube (9) is formed by spirally winding two groups of transmission tubes, a supporting frame (8) is installed at the lower side of the spiral double tube (9), and the supporting frame (8) is fixedly connected with the guide plate (6).

3. The high-conversion-efficiency air preheater as set forth in claim 1, wherein the inner wall of the preheating tank (1) is attached with a heat insulation pad (13), and a plurality of heat insulation cavities (14) are formed in the heat insulation pad (13).

4. An air preheater with high conversion efficiency according to claim 1, wherein the preheating tank (1) is internally provided with a temperature sensor (16), the outside of the preheating tank (1) is provided with a control panel (15), and the control panel (15) is electrically connected with the temperature sensor (16).

5. An air preheater with high conversion efficiency according to claim 1, characterized in that a second blower (4) is mounted on one side of the outer tube (7), a cold air inlet tube (701) a first blower (3).

6. The air preheater with high conversion efficiency according to claim 1, wherein the outer side of the preheating box (1) is fixedly and in through connection with a fixed pipe (5), the inside of the fixed pipe (5) is slidably connected with a movable pipe (501), the surface side of the movable pipe (501) is provided with a plurality of exhaust holes (503), and the upper side of the movable pipe (501) is fixedly connected with a limiting plate (502).