CN205447805U

CN205447805U - With core type air heater

Info

Publication number: CN205447805U
Application number: CN201620217074.5U
Authority: CN
Inventors: 徐传海; 罗庆; 闵山山
Original assignee: China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Current assignee: China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
Priority date: 2016-03-21
Filing date: 2016-03-21
Publication date: 2016-08-10
Anticipated expiration: 2026-03-21

Abstract

The utility model discloses a with core type air heater relates to an air heater equipment. It includes that casing, central rotor, flue gas passageway, wind passageway of high pressure, low pressure secondary air channel, hoop seal up, and flue gas passageway, wind passageway of high pressure and low pressure secondary air channel all install in the casing and all pass the bin, central rotor comprises the inboard rotor of the center pin that is close to central rotor and the outside rotor of keeping away from central rotor 's center pin, low pressure secondary air channel is by forming an air duct between sealed inboard of inboard rotor, hoop and the casing, the 2nd air duct that wind passageway of high pressure was served as reasons and is formed between the sealed outside of outside rotor, hoop and the casing, the cross section that the hoop is sealed is convex, and the cross section of a wind passageway of high pressure is convex, and low pressure secondary air channel's cross section is fan -shaped. The utility model discloses simple structure has improved heat exchange efficiency, reduces fan energy consumption.

Description

Concentric type air preheater

Technical field

This utility model relates to a kind of air preheater device, a kind of concentric type air preheater.

Background technology

Air preheater is one and utilizes the waste heat of flue gas in boiler back end ductwork that fuel combustion required air is heated to the heat exchanger of uniform temperature.In modern station boiler, it is indispensable important composition parts, and air preheater is mainly used in improving the heat exchange performance of boiler, reduces energy consumption.

In modern station boiler, the most frequently used air preheater has tubular air preheater and rotary regenerative air preheater, and tubular air preheater is heat transfer type, and rotary regenerative air preheater is heat storage type.Rotary regenerative air preheater is high due to heat-transfer area density, compact conformation, and installation and repairing is convenient, and operating cost is low, and floor space is little, existing widely used by big-and-middle-sized power plant, and it can make boiler save fuel 8%～10%, improves boiler efficiency.The air preheater that the most domestic supercritical and extra-supercritical unit use is all rotary regenerative air preheater.

Shown in the structural representation of rotary regenerative air preheater as existing in Fig. 1 to Fig. 3, it includes housing 1, the center rotor 2 that also can rotate in being arranged on housing 1, it is positioned at the exhaust gases passes 5 on the right side of center rotor 2, it is positioned at the high pressure First air passage 6 on the left of center rotor 2, it is positioned at the low-pressure secondary wind passage 7 on the left of center rotor 2, the heat extraction original paper (heating surface) of heat exchange action has been installed on center rotor 2, exhaust gases passes 5, the cross section of high pressure First air passage 6 and low-pressure secondary wind passage 7 is sector, when center rotor 2 rotates in the counterclockwise direction, the heating surface of center rotor 2 can flow successively through exhaust gases passes 5, high pressure First air passage 6 and low-pressure secondary wind passage 7.

Find the most afterwards, there is the problem that inleakage is big in above-mentioned existing rotary regenerative air preheater, concrete reason is as follows: 1, owing to existing rotary regenerative air preheater is by making heating surface alternately contact exhaust gases passes, high pressure First air passage and low-pressure secondary wind passage and realize heat exchange, therefore during center rotor rotates, air in high pressure First air passage is not only easily brought in low-pressure secondary wind passage by center rotor, make the air in high pressure First air passage and the mixing of the air in low-pressure secondary wind passage, and easily the air in low-pressure secondary wind passage is brought in flue gas, the air in low-pressure secondary wind passage is made to mix with flue gas, so that causing air-introduced machine load to increase, energy consumption and coal consumption increase, boiler efficiency declines, it is therefore desirable to improve.2, owing to the air side pressure in rotary regenerative air preheater is more than fume side pressure, therefore the pressure differential that can be formed between air side and fume side, during rotor rotates, above-mentioned pressure differential easily makes the air in air duct leak into fume side, so that causing air-introduced machine load to increase, energy consumption and coal consumption increase, and boiler efficiency declines, it is therefore necessary to improve.

The problem big in order to solve inleakage existing for existing rotary regenerative air preheater, people are generally by adding sealing device to reduce the inleakage of rotary regenerative air preheater.Although inleakage can be reduced to a certain extent by increasing sealing device, but the air in air duct is easily carried to the problem of exhaust gases passes unresolved by center rotor when rotating, and time in practical work process, above-mentioned sealing device is substantially stuck on the dividing plates at different levels of center rotor, therefore increase sealing device in actual mechanical process, still suffer from the problem that air leak rate of air curtain is higher, thus air-introduced machine load can be caused to increase, energy consumption and coal consumption increase, boiler efficiency declines, it is therefore necessary to improve.

Summary of the invention

The purpose of this utility model is the weak point in order to overcome background technology, and provides a kind of concentric type air preheater.

To achieve these goals, the technical solution of the utility model is: concentric type air preheater, the center rotor that including housing, is arranged in housing and can rotate, is positioned at the exhaust gases passes on the right side of center rotor, is positioned at the high pressure First air passage on the left of center rotor, is positioned at the low-pressure secondary wind passage on the left of center rotor；Being provided with multiple bin being split to form by dividing plate in described center rotor, be mounted on the original paper that conducts heat in each bin, exhaust gases passes, high pressure First air passage and low-pressure secondary wind passage are installed in housing and both pass through described bin；The upper end of exhaust gases passes is smoke inlet, the lower end of exhaust gases passes is outlet flue, and the lower end of high pressure First air passage is First air import, and the upper end of high pressure First air passage is First air outlet, low-pressure secondary wind passage lower end is secondary air inlet, and the upper end of low-pressure secondary wind passage is secondary air inlet；It is characterized in that: also including that being arranged on interior and the most coaxial with the center rotor hoop of housing seals, described center rotor is by the inboard rotor of the central shaft near center rotor, and the outside rotors away from the central shaft of center rotor is constituted.

In technique scheme, described low-pressure secondary wind passage is to form the first air duct between inner side and the housing sealed by inboard rotor, hoop, and described high pressure First air passage is the second air duct formed between outside and the housing sealed by outside rotors, hoop.

In technique scheme, the cross section that hoop seals is circular arc, and the cross section of described high pressure First air passage is circular arc, and the cross section of low-pressure secondary wind passage is fan-shaped.

This utility model simple in construction, it is easy to arrange, save encapsulant, reduce manufacturing cost.Owing to high pressure First air passage of the present utility model and low-pressure secondary wind passage can use different heat-transfer surfaces respectively, therefore this utility model goes for multiple different operating condition, therefore this concentric type air preheater has the widest subject range to ature of coal used by boiler, flexible design can be carried out according to operating condition and adjust the heat-transfer surface area contacted with first and second wind cabin, to meet service condition.

Simultaneously, owing to this utility model utilizes hoop to seal, high pressure First air passage and low-pressure secondary wind channel separation are come, high pressure First air passage is made to contact with various heat exchange face respectively with low-pressure secondary wind passage and heat-shift, therefore this utility model can reduce because rotor carries the Air Leakage caused greatly, thus improve heat exchange efficiency, reduce fan energy consumption.During real work, hoop seals and can be arranged on by the way of the supporting structure fitting in dividing plate in housing, and sealing effectiveness is more preferable, and is easily achieved.

Accompanying drawing explanation

Fig. 1 is the structural representation of prior art.

Fig. 2 is that the A-A of Fig. 1 cuts open schematic diagram.

Fig. 3 is that the B-B of Fig. 2 cuts open schematic diagram.

Fig. 4 is structural representation of the present utility model.

Fig. 5 is that the C-C of Fig. 4 cuts open schematic diagram.

Fig. 6 is that the D-D of Fig. 5 cuts open schematic diagram.

1-housing in figure, 2-rotor, 21-inboard rotor, 22-outside rotors, 3-dividing plate, 4-bin, 5-exhaust gases passes, 51-smoke inlet, 52-outlet flue, 6-high pressure First air passage, 61-First air import, 62-secondary wind exports, 7-low-pressure secondary wind passage, 71-secondary air inlet, 72-secondary air inlet, 8-hoop seals.

Detailed description of the invention

Describe performance of the present utility model below in conjunction with the accompanying drawings in detail, but they are not intended that restriction of the present utility model, the most for example.Make advantage of the present utility model more clear and easy to understand by explanation simultaneously.

Understand refering to accompanying drawing: concentric type air preheater, including housing 1, be arranged on housing 1 in and can rotate center rotor 2, be positioned at the exhaust gases passes 5 on the right side of center rotor 2, be positioned at the high pressure First air passage 6 on the left of center rotor 2, be positioned at the low-pressure secondary wind passage 7 on the left of center rotor 2；Multiple bin 4 being split to form by dividing plate 3 it is provided with in described center rotor 2, be mounted on the original paper that conducts heat in each bin 4, exhaust gases passes 5, high pressure First air passage 6, low-pressure secondary wind passage 7 and hoop seal 8 be installed in housing 1 in and both pass through described bin 4；The upper end of exhaust gases passes 5 is smoke inlet 51, the lower end of exhaust gases passes 5 is outlet flue 52, the lower end of high pressure First air passage 6 is First air import 61, the upper end of high pressure First air passage 6 is First air outlet 62, low-pressure secondary wind passage 7 lower end is secondary air inlet 71, and the upper end of low-pressure secondary wind passage 7 is secondary air inlet 72；It is characterized in that: also include that being arranged on interior and the most coaxial with center rotor 2 hoop of housing 1 seals 8, it is circular arc that hoop seals the cross section of 8, described center rotor 2 is by the inboard rotor with the central shaft of center rotor 2, and the outside rotors away from the central shaft of center rotor 2 is constituted；Described low-pressure secondary wind passage 7 is to be sealed by inboard rotor, hoop to form the first air duct 7 between inner side and the housing of 8, described high pressure First air passage 6 be by outside rotors, hoop sealing 8 outside and housing between the second air duct 6 of being formed.

The cross section of described high pressure First air passage 6 is circular arc, and the cross section of low-pressure secondary wind passage 7 is fan-shaped.

Other unaccounted part belongs to prior art.

Claims

1. concentric type air preheater, the center rotor (2) including housing (1), being arranged in housing (1) and rotating, is positioned at the exhaust gases passes (5) on the right side of center rotor (2), is positioned at high pressure First air passage (6) on the left of center rotor (2), is positioned at low-pressure secondary wind passage (7) on the left of center rotor (2)；

Multiple bin (4) being split to form by dividing plate (3) it is provided with in described center rotor (2), being mounted on the original paper that conducts heat in each bin (4), it is interior and both pass through described bin (4) that exhaust gases passes (5), high pressure First air passage (6) and low-pressure secondary wind passage (7) are installed in housing (1)；

The upper end of exhaust gases passes (5) is smoke inlet (51), the lower end of exhaust gases passes (5) is outlet flue (52), the lower end of high pressure First air passage (6) is First air import (61), the upper end of high pressure First air passage (6) is that First air exports (62), low-pressure secondary wind passage (7) lower end is secondary air inlet (71), and the upper end of low-pressure secondary wind passage (7) is secondary air inlet (72)；

It is characterized in that:

Also include that being arranged on interior and the most coaxial with center rotor (2) hoop of housing (1) seals (8), described center rotor (2) is by the inboard rotor (21) of the central shaft near center rotor (2), and the outside rotors (22) away from the central shaft of center rotor (2) is constituted.

Concentric type air preheater the most according to claim 1, it is characterized in that: described low-pressure secondary wind passage (7) is to form the first air duct between inner side and the housing being sealed (8) by inboard rotor (21), hoop, and described high pressure First air passage (6) is to be sealed, by outside rotors (22), hoop, the second air duct formed between outside and the housing of (8).

Concentric type air preheater the most according to claim 2, it is characterized in that: it is circular arc that described hoop seals the cross section of (8), the cross section of high pressure First air passage (6) is circular arc, and the cross section of low-pressure secondary wind passage (7) is fan-shaped.