CN202209771U

CN202209771U - Indirect type hot-blast stove

Info

Publication number: CN202209771U
Application number: CN2011202856526U
Authority: CN
Inventors: 张宏
Original assignee: Zhangjiagang Jiangnan Boiler & Pressure Vessel Co Ltd
Current assignee: Zhangjiagang Jiangnan Boiler & Pressure Vessel Co Ltd
Priority date: 2011-08-08
Filing date: 2011-08-08
Publication date: 2012-05-02
Anticipated expiration: 2021-08-08

Abstract

The utility model discloses an indirect type hot-blast stove, which comprises a stove body with an air inlet and an air outlet, a burner, a high-temperature flue gas channel and a low-temperature air channel. The burner comprises a combustion cylinder arranged in the stove body and served as a generation place for providing high-temperature flue gas. A tube bundle is arranged in the stove body and one end portion of the tube bundle is in a sealing connection with the combustion cylinder. The other end portion of the tube bundle passes through the wall of the stove body. The periphery of the end portion of the tube bundle positioned outside the stove body is provided with an expansion difference absorption structure. One end portion of the expansion difference absorption structure is in a sealing connection with the wall of the stove body, while the other end portion of the expansion difference absorption structure is hermetically connected with a flue gas outlet communicated with the tube bundle. The combustion cylinder, the tube bundle and the flue gas outlet integrally form the S-shaped high-temperature flue gas channel. The air inlet, the outer wall of the high-temperature flue gas channel, the inner wall of the stove body, the expansion difference absorption structure and the air outlet integrally form the low-temperature air channel. The indirect type hot-blast stove is more compact in overall structure and the cracks and the leakage of the indirect type hot-blast stove are avoided. Meanwhile, the metal wall of the stove is better in safety performance.

Description

A kind of indirect type hot-blast stove

Technical field

the utility model relates to a kind of indirect type hot-blast stove.

Background technology

through long production practices, and people recognize, have only the hot blast of utilization as medium with carrier could improve heat utilization efficiency and the thermal technology makes effect biglyyer.Traditional electrical thermal source and steam thermal power often dispose many circulating fans in course of conveying, make it the final hot blast operation of drying or heat that still forms indirectly.The obvious existence of this process wastes energy in a large number and causes many shortcomings such as auxiliary device is too much, complex technical process.And bigger problem is, this thermal source is then felt simply helpless for the sort of requirement that needs higher temperature drying or baking operation.Therefore, begin extensive use in late 1970s in China as the hot-blast stove of thermal power machinery, and become the regeneration product of electric heat source and traditional steam power thermal source in many industries.

hot-blast stove can be divided into direct-type hot-blast stove and indirect type hot-blast stove according to the working media situation.The direct-type hot-blast stove adopts fuel directly to burn, and forms hot blast through purified treatment, and directly contacts heat drying or baking with material.This kind method has Fuel Consumption and significantly reduces and the hot blast temperature advantages of higher, but because of containing dust and other pernicious gases in the flue gas after the fuel combustion, does not allow the dry run when contaminated then powerless for the material that is dried.The indirect type hot-blast stove is applicable to that mainly the material that is dried does not allow the dry materials when contaminated, as: milk powder, pharmacy, synthetic resin, fine chemistry industry etc.This kind heater promptly is that steam, conduction oil, flame and high-temperature flue gas heating, flue gas etc. are done carrier, and the heat exchanger through various ways adds hot-air.And when adopting indirect type hot-blast stove structure; When particularly directly adopting combustion apparatus generation flame and high-temperature flue gas to carry out the hot blast heating; Often because cold side (air side), hot side (flame and high-temperature flue gas) temperature difference are huge; Thereby handle bad often the operation and just produce the phenomenon that the caused metal material fatigue crack generation of thermal stress and thermal expansion difference clean hot air is suffered the flue gas pollution soon at hot-blast stove, can only shutdown maintenance when serious.

Summary of the invention

the utility model technical problem to be solved is the deficiency that overcomes prior art, and a kind of improved indirect type hot-blast stove is provided.

For solving above technical problem, the utility model is taked following technical scheme:

A kind of indirect type hot-blast stove, it comprises the body of heater with air intake and air outlet slit, the burner that is used to produce high-temperature flue gas, high-temperature flue gas passage and Cryogenic air passage, wherein:

Burner comprises that being positioned at body of heater provides the combustion barrel in high-temperature flue gas generation place and be positioned at the fuel portion that body of heater is used for providing to said combustion barrel fuel and air outward;

In said body of heater, be provided with the tube bank that an end and combustion barrel are tightly connected; The wall of body of heater is passed in the other end of this tube bank; And its part periphery that is positioned at outside the body of heater is provided with the differential expansion absorbing structure; The wall of this differential expansion absorbing structure one end and body of heater is tightly connected, and the other end is sealedly connected with and restrains the exhanst gas outlet that is communicated with, and said combustion barrel, tube bank and exhanst gas outlet have constituted snakelike high-temperature flue gas passage jointly;

described air intake, the outer wall of high-temperature flue gas passage, the inwall of body of heater, differential expansion absorbing structure, air outlet slit have constituted described Cryogenic air passage jointly.

also are provided with a plurality of deflectors according to a preferred aspect of the utility model in said body of heater, make that transversal flow flows through the high-temperature flue gas passage to the interior gas of Cryogenic air passage in the outside.

are according to a concrete aspect of the utility model; Said body of heater is horizontal tubular; Combustion barrel comprise the cylindrical shell that extends along the length direction of said body of heater and with the tube elbow of a Seal welds for ends of cylindrical shell, the tube elbow is tightly connected through tube sheet with tube bank.More specifically, described tube bank is made up of many U type pipes.

Because the enforcement of above technical scheme, the utility model compared with prior art has following advantage:

the utility model is arranged in combustion barrel in the body of heater, makes that the overall structure of hot-blast stove is compact more, has reduced the loss of heat; Because of snakelike formula heated face structure and differential expansion absorption plant have good hot expansibility, crackle and leakage have been avoided; High-temperature flue gas is made parallel baffled in the high-temperature flue gas passage, its heat transfer coefficient is reduced high-temperature flue gas passage tube wall temperature, the reduction of tube wall temperature, the security that has improved metallic walls greatly far below the air of outside the high-temperature flue gas passage, making transversal flow.

Description of drawings

are done further detailed explanation below in conjunction with accompanying drawing and concrete embodiment to the utility model.

Fig. 1 looks sketch map for the master according to the hot-blast stove of the utility model;

Fig. 2 be among Fig. 1 A-A to view;

Fig. 3 be among Fig. 1 A to view;

wherein: 1, body of heater; 10, air intake; 11, air outlet slit; 2, combustion barrel; 20, cylindrical shell; 21, tube elbow; 3, tube sheet; 4, tube bank; 5, differential expansion absorbing structure; 6, exhanst gas outlet; 7, deflector; 8, fuel portion; 9, supporting base.

The specific embodiment

comprise the body of heater of horizontal tubular, the burner that is used to produce high-temperature flue gas, high-temperature flue gas passage and Cryogenic air passage according to the hot-blast stove of present embodiment.Do further detailed explanation below in conjunction with the hot-blast stove of Fig. 1 to 3 pair of present embodiment.

body of heater 1 is supported by supporting base 9, and its top diverse location is respectively equipped with air intake 10 and air outlet slit 11.Be provided with the combustion barrel 2 that extends along its length direction in the bottom of body of heater 1.The outer end of the cylindrical shell 20 of this combustion barrel be used to provide the fuel portion 8 of fuel and air to be connected; The inner end seal of cylindrical shell 20 is welded with an elbow 21; The tube bank 4 that this elbow 21 has been tightly connected and has been made up of many U type pipes through tube sheet 3; The wall setting that body of heater 1 is passed in the other end of tube bank 4; And its periphery that is positioned at the part outside the body of heater 1 is provided with the differential expansion absorbing structure 5 with body of heater 1 sealing welding, and this differential expansion absorbing structure 5 is corrugated tube (also can be the version of other absorbable expansion difference), and its outer end is sealedly connected with and restrains 4 exhanst gas outlets 6 that are communicated with.So, constituted snakelike high-temperature flue gas passage of the present invention between combustion barrel 2, tube bank 4 and the exhanst gas outlet 6.The Cryogenic air passage is then surrounded by outer wall, differential expansion absorbing structure 5, the air outlet slit 11 of air intake 10, high-temperature flue gas passage jointly.In addition, in body of heater 1, also be welded with a plurality of deflectors 7, flow through the low temperature side flow process according to predetermined runner to guarantee air.

The workflow of the hot-blast stove of present embodiment is following:

are at high temperature side: liquid or gaseous fuel and air carry out the internal combustion burning through burning part 8 in combustion barrel 2; Form flame and high-temperature flue gas, flame and high-temperature flue gas are discharged from exhanst gas outlet 6 backs after inboard parallel baffled passage is flowed through cylindrical shell 20, tube elbow 21, tube sheet 3, tube bank 4 successively.Flue gas is sealed in the high-temperature flue gas passage all the time, can not reveal.

are at low temperature side: clean cold air gets into bodies of heater 1 through air intake 10; And, flow out after laterally (perpendicular to the direction of tube bank 4 and combustion barrel 2) washed away second section of flowing through tube bank 4, combustion barrel 2 and restrained 4 first section in the outside successively from air outlet slit 11.

When high temperature side flame and high-temperature flue gas circulate, pass to the metallic walls of passage to heat gradually in the high-temperature flue gas passage, thereby high-temperature flue gas obtains cooling, finally discharge this device with lower temperature.

Cryogenic air passage is wrapped in the outside of high-temperature flue gas passage, when the cold pure air of low temperature side circulates in the Cryogenic air passage, constantly absorbs the heat of high-temperature flue gas passage, flows out after finally being heated to predetermined temperature.

to sum up, the heating surface of the hot-blast stove of present embodiment is arranged as bobbin and makes up snakelike formula heated face structure, promptly by the serpentine configuration that connects combustion barrel 2, tube bank 4.Bobbin makes up the thermal expansion that snakelike formula heated face structure and differential expansion absorbing structure 5 constituted this device jointly and coordinates absorption system, has guaranteed the sealing property of system; Fuel portion 8 has constituted the internal combustion combustion system jointly with combustion barrel 2, has saved arrangement space greatly; High-temperature flue gas is made parallel baffled in the high-temperature flue gas passage, its heat transfer coefficient is reduced high-temperature flue gas passage tube wall temperature, the reduction of tube wall temperature, the security that has improved metallic walls greatly far below the air of outside the high-temperature flue gas passage, making transversal flow.

are above has done detailed description to the utility model, but the utility model is not limited to the above embodiments.All equivalences of doing according to the spirit of the utility model change or modify, and all should be encompassed in the protection domain of the utility model

Claims

1. indirect type hot-blast stove comprises it is characterized in that have air intake (10) and the body of heater (1) of air outlet slit (11), the burner that is used to produce high-temperature flue gas, high-temperature flue gas passage and Cryogenic air passage:

Said burner comprises that being positioned at said body of heater (1) provides the combustion barrel (2) in high-temperature flue gas generation place and be positioned at the outer fuel portion (8) that is used for providing to said combustion barrel (2) fuel and air of said body of heater (1);

In said body of heater (1), be provided with the tube bank (4) that an end and said combustion barrel (2) are tightly connected; The wall of described body of heater (1) is passed in the other end of said tube bank (4); The part periphery that is positioned at outside the said body of heater (1) of said tube bank (4) is provided with differential expansion absorbing structure (5); The wall of said differential expansion absorbing structure (5) one ends and said body of heater (1) is tightly connected; The other end is sealedly connected with the exhanst gas outlet (6) that is communicated with said tube bank (4), and said combustion barrel (2), tube bank (4) and exhanst gas outlet (6) have constituted snakelike high-temperature flue gas passage jointly;

The inwall of the outer wall of described air intake (10), described high-temperature flue gas passage, said body of heater (1), described differential expansion absorbing structure (5), air outlet slit (11) have constituted described Cryogenic air passage jointly.

2. indirect type hot-blast stove according to claim 1 is characterized in that: in said body of heater (1), be provided with a plurality of deflectors (7), make that transversal flow flows through described high-temperature flue gas passage to the interior gas of said Cryogenic air passage in the outside.

3. indirect type hot-blast stove according to claim 1 and 2; It is characterized in that: said body of heater (1) is horizontal tubular; Described combustion barrel (2) comprise the cylindrical shell (20) that extends along the length direction of said body of heater (1) and with the tube elbow (21) of a Seal welds for ends of said cylindrical shell (20), said tube elbow (21) is tightly connected through tube sheet (3) with described tube bank (4).

4. indirect type hot-blast stove according to claim 1 is characterized in that: described tube bank (4) is made up of many U type pipes.

5. indirect type hot-blast stove according to claim 1 is characterized in that: described differential expansion absorbing structure (5) is a corrugated tube.