CN214370346U

CN214370346U - Energy-saving efficient heat exchange air preheater for boiler

Info

Publication number: CN214370346U
Application number: CN202022999195.9U
Authority: CN
Inventors: 韩磊; 史月涛; 陈保奎
Original assignee: Shandong Zhongtian Yanchuang Energy Saving And Environmental Protection Technology Co ltd
Current assignee: Shandong Zhongtian Yanchuang Energy Saving And Environmental Protection Technology Co ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-10-08
Anticipated expiration: 2030-12-15

Abstract

The utility model relates to a boiler energy-saving high-efficient heat transfer air preheater, including heat transfer element, advance the mouth, go out mouth, air intlet and air outlet, heat transfer element includes box, tube bank and tube sheet, be equipped with a plurality of tube sheet holes on the tube sheet, the tube bank pass the tube sheet hole and with tube sheet hole sealing connection, the tube bank both ends are fixed on the box, the tube sheet divide into flue gas passageway and air passageway with heat transfer element, the top of flue gas passageway is equipped with into the mouth, the below of flue gas passageway is equipped with out the mouth, air passageway's top is equipped with air outlet, air passageway's below is equipped with air intlet. The utility model discloses a to current air preheater component transformation, changed traditional cigarette of air heater, wind mobile mode, effective control pipe wall temperature makes it be in high wall temperature running state all the time and does not produce the dewfall, ensures that the scouring ability of flue gas stream is greater than attachment bonding rate, eliminates cigarette ash bonding phenomenon, and corrosion problems also obtains solving.

Description

Energy-saving efficient heat exchange air preheater for boiler

Technical Field

The utility model relates to a tubular air heater technical field, in particular to energy-saving high-efficient heat transfer air preheater of boiler.

Background

In recent years, due to environmental protection requirements, denitration devices have been installed on power plant boilers, and due to the operating process requirements of SCR and the reasons that fuel contains sulfur, ash, water and the like, the operating conditions are severe. Therefore, the air preheater has the problems of dust deposition, abrasion, low-temperature corrosion and the like. These problems will affect the heat transfer, raise the temperature of the exhausted smoke, increase the ventilation resistance of the flue, cause the leakage of the heated surface due to low-temperature corrosion, increase the air leakage rate, shorten the operating life of the components, lower the thermal efficiency of the boiler, and the direct cost of equipment replacement and shutdown for ash removal caused by low-temperature corrosion, abrasion and ash deposition accounts for about 4% -5% of the operating cost.

SUMMERY OF THE UTILITY MODEL

In order to improve the problem that proposes among the above-mentioned background art, the utility model provides a boiler energy-saving high-efficient heat transfer air preheater.

The utility model provides a pair of energy-saving high-efficient heat transfer air preheater of boiler adopts following technical scheme:

the utility model provides an energy-saving high-efficient heat transfer air preheater of boiler, includes heat transfer component, advances the mouth, goes out the mouth, air intlet and air outlet, heat transfer component includes box, tube bank and tube sheet, be equipped with a plurality of tube sheet holes on the tube sheet, the tube bank pass the tube sheet hole and with tube sheet hole sealing connection, the tube bank both ends are fixed on the box, the tube sheet divide into flue gas passageway and air passage with heat transfer component, flue gas passageway's top is equipped with into the mouth, flue gas passageway's below is equipped with out the mouth, air passage's top is equipped with air outlet, air passage's below is equipped with air intlet.

Preferably, the tube bundle comprises a plurality of heat transfer tubes parallel to each other.

Preferably, the inner part of the heat transfer pipe is in a vacuum structure.

Preferably, the heat transfer pipe is sealed at both ends.

By adopting the technical scheme, the phenomenon of air leakage and flue gas leakage can be prevented, and because the heat transfer pipes are not mutually connected, the fault (such as hot side wear-through) of a single heat transfer pipe has no influence on the operation of the whole heat transfer pipe heat exchanger basically.

Preferably, the outer wall of the heat transfer pipe is provided with fins.

By adopting the technical scheme, the heat transfer outside the pipe is enhanced, the size and the weight of the heat exchanger are effectively reduced, metal consumables are saved, and a heat exchange device with high cost performance can be obtained.

Preferably, a flue gas guide plate is arranged below the flue gas channel.

Preferably, the smoke outlet is connected with a dust remover.

Preferably, the box body is obliquely arranged.

To sum up, the utility model discloses following useful technological effect has:

1. the utility model discloses a to current air heater component transformation, make full use of flue gas waste heat, effective control pipe wall temperature makes it be in high wall temperature running state all the time and does not produce the dewfall, ensures that the scouring ability that flue gas (ash) flowed is greater than attachment bonding rate, eliminates cigarette ash bonding phenomenon, and the corrosion problems also obtains solving, simultaneously, has reduced air heater's energy resource consumption, has reached the energy-conserving purpose of waste heat recovery, has practiced thrift the energy.

2. The utility model discloses have high heat conductivility, it is through the evaporation of working medium and the heat transfer that condenses in totally closed vacuum tube, has good isothermality, heat transfer efficiency height, and the fluid resistance loss is little, the flue gas does not leak, does not have additional consumption of power, operation and maintenance cost.

3. The utility model discloses changed traditional cigarette of air heater, wind mobile mode, with the help of the rational design of flue gas velocity of flow, can realize air heater's flue gas from blowing the ash effect, prevent the stifled ash of flue gas side of pre-heater, the deashing that significantly reduces, maintenance work load.

Drawings

FIG. 1 is a schematic structural diagram of an energy-saving efficient heat exchange air preheater for a boiler according to the present invention;

FIG. 2 is a schematic view of the cross-sectional structure of the tube plate of the present invention;

fig. 3 is a schematic view of the structure of the outer wall of the heat transfer tube of the present invention.

Wherein, 1, a heat exchange element; 2. a smoke inlet; 3. a smoke outlet; 4. an air inlet; 5. an air outlet; 6. A box body; 7. a tube bundle; 8. a tube sheet; 9. tube sheet holes; 10. a flue gas channel; 11. an air passage; 12. a flue gas guide plate; 13. a heat transfer tube; 14. a fin; 15. a dust remover.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 to 3, a boiler energy-saving high-efficient heat transfer air preheater includes heat exchange element 1, advances cigarette mouth 2, outlet flue 3, air intlet 4 and air outlet 5, heat exchange element 1 includes box 6, tube bank 7 and tube sheet 8, be equipped with a plurality of tube sheet holes 9 on the tube sheet 8, tube bank 7 passes tube sheet hole 9 and with tube sheet hole 9 sealing connection, 7 both ends of tube bank are fixed on box 6, tube sheet 8 divide into flue gas passageway 10 and air duct 11 with heat exchange element 1, flue gas passageway 10's top is equipped with into cigarette mouth 2, flue gas passageway 10's below is equipped with outlet flue 3, air duct 11's top is equipped with air outlet 5, air duct 11's below is equipped with air intlet 4.

In practical application: heat exchange element 1 includes box 6, tube bank 7 and tube sheet 8, be equipped with a plurality of tube sheet holes 9 on the tube sheet 8, tube bank 7 passes tube sheet holes 9 and with tube sheet holes 9 sealing connection, tube bank 7 both ends are fixed on box 6, tube bank 7 includes the heat-transfer pipe 13 that a plurality of is parallel to each other, the inside vacuum structure that is of heat-transfer pipe 13, and heat-transfer pipe 13 both ends are sealed, heat-transfer pipe 13 outer wall is provided with fin 14, tube sheet 8 divide into flue gas passageway 10 and air passage 11 with heat exchange element 1, flue gas passageway 10's top is equipped with into smoke inlet 2, flue gas passageway 10's below is equipped with outlet 3, air passage 11's top is equipped with air outlet 5, air passage 11's below is equipped with air inlet 4, flue gas passageway 10's below is equipped with flue gas guide plate 12, outlet 3 is connected with dust remover 15.

The working principle is as follows: the smoke enters the smoke channel 10 from the smoke inlet 2, heats and vaporizes the heat transfer medium in the heat transfer pipe 13, rises to the air channel 11 at the upper part of the heat transfer pipe 13, releases latent heat of vaporization, heats the air passing through the air channel 11, the heat transfer medium in the heat transfer pipe 13 returns to the smoke channel 10 along the inner wall of the heat transfer pipe 13 under the action of gravity after being cooled, and according to the circulation action, the heat of the smoke discharged by the boiler is continuously transferred to the air entering the boiler through the heat transfer medium in the heat transfer pipe 13 of the smoke channel 10, thereby reducing the smoke discharging temperature, the heat transfer of the heat transfer pipe 13 is two-phase change, and the heat is transferred in a medium latent heat change mode, so the heat is good in thermal stability and large in heat transfer effect, the heat can be transferred under a small temperature difference, the smoke channel 10 flows as smoke, the air channel 11 flows as air, and the smoke and the air both flow outside the pipe, and the smoke self-blowing effect of the smoke of the air preheater can be realized, the tube sheet 8 of heat-transfer pipe 13 flue gas passageway 10 and air channel 11 is separated and is easily sealed, the air leakage volume reduces greatly, the resistance is also low, because the heat transfer medium in each heat-transfer pipe 13 is not mutually connected, so single heat-transfer pipe 13 trouble (if the hot side wears out) does not have any influence basically to the operation of whole heat-transfer pipe 13 heat exchanger, the outer wall heat transfer area of heat-transfer pipe 13 utilizes fin 14 to do moderate degree extension, the design like this, not only strengthened heat-transfer pipe 13 outer heat transfer, also effectual volume and weight of having reduced, metal consumptive material has been practiced thrift, can obtain a high performance price ratio's indirect heating equipment, high wall temperature can be realized through the length of controlling heat-transfer pipe 13 to the wall temperature of heat-transfer pipe 13, thereby the air heater low temperature section ammonium bisulfate dewing corrosion ash blockage problem that denitration system caused because of ammonia escape has been solved.

Above is the preferred embodiment of the utility model, not limit according to this the utility model discloses a protection scope, the event: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a boiler energy-saving high-efficient heat transfer air preheater, includes heat transfer component (1), advances cigarette mouth (2), outlet flue (3), air intlet (4) and air outlet (5), its characterized in that: heat exchange element (1) includes box (6), tube bank (7) and tube sheet (8), be equipped with a plurality of tube sheet holes (9) on tube sheet (8), tube bank (7) pass tube sheet hole (9) and with tube sheet hole (9) sealing connection, tube bank (7) both ends are fixed on box (6), tube sheet (8) divide into flue gas passageway (10) and air passage (11) with heat exchange element (1), the top of flue gas passageway (10) is equipped with into mouth (2), the below of flue gas passageway (10) is equipped with outlet flue (3), the top of air passage (11) is equipped with air outlet (5), the below of air passage (11) is equipped with air intlet (4).

2. The energy-saving efficient heat exchange air preheater of the boiler according to claim 1, characterized in that: the tube bundle (7) comprises a plurality of mutually parallel heat transfer tubes (13).

3. The energy-saving efficient heat exchange air preheater of the boiler according to claim 2, characterized in that: the interior of the heat transfer pipe (13) is of a vacuum structure.

4. The energy-saving efficient heat exchange air preheater of the boiler according to claim 2, characterized in that: the two ends of the heat transfer pipe (13) are sealed.

5. The energy-saving efficient heat exchange air preheater of the boiler according to claim 2, characterized in that: fins (14) are arranged on the outer wall of the heat transfer pipe (13).

6. The energy-saving efficient heat exchange air preheater of the boiler according to claim 1, characterized in that: a smoke guide plate (12) is arranged below the smoke channel (10).

7. The energy-saving efficient heat exchange air preheater of the boiler according to claim 1, characterized in that: the smoke outlet (3) is connected with a dust remover (15).

8. The energy-saving efficient heat exchange air preheater of the boiler according to claim 1, characterized in that: the box body (6) is obliquely arranged.