CN202118939U

CN202118939U - Air preheater

Info

Publication number: CN202118939U
Application number: CN2011201972483U
Authority: CN
Inventors: 倪加明
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-06-13
Filing date: 2011-06-13
Publication date: 2012-01-18
Anticipated expiration: 2021-06-13

Abstract

The utility model relates to an air preheater using waste hot air of a bell furnace to preheat air, which comprises a casing containing insulation materials. A smoke inlet and a smoke outlet are arranged above and below the casing respectively, two partition boards are arranged in the casing, and a plurality of heat exchanging pipes are arranged between the two partition boards evenly. An air outlet and an air inlet are arranged above and below one side of the casing, smoke flows between the two partition boards, and another partition board is arranged in the middle of the partition board on the side close to the air inlet and the air outlet to separate the air inlet and air outlet. Due to the fact that common seamless steel pipes are used as heat exchanging pipes, welding is unnecessary, thereby enabling the air preheater to be simple in structure and convenient to install, reducing production cost, and prolonging service life. Helical heat resistant steel plates are arranged in the heat exchanging pipes, the air is enabled to fully move along pipe walls, heat is absorbed to the maximum degree, and temperature is enabled to rise; or helical fins are welded on the outside of the pipe walls, heat transfer area is increased, and a heat exchanging effect is fully improved.

Description

Air preheater

Technical field:

The utility model relates to a kind of air heater, relates in particular to a kind of waste heat gas that utilizes bell furnace carries out preheating to air device.

Background technology:

In recent years; Along with market to the sheet material of ferrous metal and non-ferrous metal bright annealing, the continuous increase of band demand, and these sheet materials, band in production process often with the form transmission of rolling, its heat treatment mainly relies on the combustion gas bell furnace for a long time; The high combustion rate burner that bell furnace adopts is when burning; Be to mix with coal gas through air and the coal gas ratio regulating system air with surplus, oxygen content (volume fraction) is controlled at 3%-5% in the general gaseous mixture, realizes completing combustion.As the air themperature of sending into is high more; The efficiency of combustion of coal gas, the combustion intensity of burner are then good more, and gas-fired is then safe more; The high-temperature flue gas that the air heat method of present bell furnace mostly adopts bell furnace in heating process, to be produced heats through the heat transmission; This mode of heating meets the industrial policy of building a conservation-minded society advocated of country, avoids simultaneously that the great amount of high-temperature flue gas directly is discharged in the air in the bell furnace, produces the greenhouse effects contaminated environment.Disclose a kind of bell type annealing furnace combustion air preheater like Chinese utility model patent CN 2432221Y, it includes the housing that has smoke entrance and air ports, and internal and external casing is arranged in the housing; Circular passage between the internal and external casing constitutes air duct, and its upper and lower side is communicated with air ports respectively; Annular chamber between inner sleeve inner chamber and outer tube and the housing constitutes exhaust gases passes, and its lower end and upper end are communicated with smoke entrance respectively; Internal and external casing one among both are round tube, and another person is a finned tube, or both are finned tube.Though this technology can be carried out heat exchange in limited housing inner chamber; But because internal and external casing is finned tube; To have bigger heat exchange area in the inner chamber in order making, must some finned tubes to be welded together, have complex structure, process loaded down with trivial details and heat uneven shortcoming.

The utility model content:

The purpose of the utility model just provides a kind of novel air preheater simple in structure, easy for installation.

The utility model is to realize like this; A kind of air preheater comprises heat exchanger tube, dividing plate and contains the housing of insulation material, is respectively arranged with gas approach and outlet up and down at said housing; It is characterized in that: two dividing plates are arranged in said housing; Between said two dividing plates, some heat exchanger tubes are installed equably, on a side of said housing, are arranged with air outlet slit and import, flue gas circulates between said two dividing plates; There is another piece dividing plate centre near the dividing plate of air inlet and outlet one side, and said air inlet and outlet are separated.

The utility model compared with prior art has following advantage:

1. be heat exchanger tube owing to having adopted general heat-resisting thin-walled, simple in structure, easy for installation, reduced production cost, improved service life.

2. have the heat-resisting steel disc of spiral in the heat exchanger tube, make air in the process of walking, fully, absorb heat to greatest extent, its temperature is raise along the tube wall walking.Or outside tube wall, be welded with helical fin, and increase heat transfer area, the inner air tube temperature is raise to greatest extent, flue-gas temperature is reduced to greatest extent, fully reach the heat exchange effect.

Description of drawings:

Fig. 1 is the structural representation of the said air preheater of the utility model

⒈ housing ⒉ gas approach 3. insulation material ⒋ dividing plate ⒌ heat exchanger tube ⒍ air outlet slit ⒎ dividing plate A ⒏ air intlet ⒐ exhanst gas outlets

The specific embodiment:

Following examples are used to explain the utility model, but are not used for limiting the scope of the utility model, and all technical schemes that are equal to also belong to the category of the utility model, and the scope of patent protection of the utility model should be limited each item claim.

As can beappreciated from fig. 1; A kind of air preheater comprises heat exchanger tube 5, dividing plate 4 and contains the housing 1 of insulation material 3, being respectively arranged with gas approach 2 and outlet 9 up and down at said housing 1; It is characterized in that: two said dividing plates 4 are arranged in said housing 1; Between said two dividing plates 4, some heat exchanger tubes 5 are installed equably, on a side of said housing 1, are arranged with air outlet slit 6 and import 8, flue gas circulates between said two dividing plates 4; There is another piece dividing plate A7 centre near the air intlet 6 and the dividing plate 4 of outlet 8 one sides, and said air intlet 6 and outlet 8 are separated.

Inwall at said air outlet slit 6 place's heat exchanger tubes 5 has flight.

The outside at said air outlet slit 6 place's heat exchanger tubes 5 is welded with helical fin equably.

Claims

1. air preheater; Comprise heat exchanger tube ⑸, dividing plate ⑷ and contain the housing ⑴ of insulation material ⑶; Said housing ⑴ be respectively arranged with up and down gas approach ⑵ with the outlet ⑼, it is characterized in that: two said dividing plate ⑷ are arranged in said housing ⑴, between said two dividing plate ⑷, some heat exchanger tube ⑸ are installed equably; On the side of said housing ⑴, be arranged with air outlet slit ⑹ and import ⑻; Flue gas circulates between said two dividing plate ⑷, in the centre near the dividing plate ⑷ of air intlet ⑹ and import ⑻ one side another piece dividing plate A ⑺ is arranged, and said air intlet ⑹ and import ⑻ are separated.

2. a kind of air preheater according to claim 1 is characterized in that: the inwall at the said air outlet slit ⑹ heat exchanger tube ⑸ of place has flight.

3. a kind of air preheater according to claim 1 and 2 is characterized in that: the outside at the said air outlet slit ⑹ heat exchanger tube ⑸ of place is welded with helical fin equably.