CN211373213U - Flue gas heat recovery heating furnace - Google Patents

Abstract

The invention discloses a flue gas heat recovery heating furnace, which belongs to the field of heating furnaces, and adopts the technical scheme that the heating furnace comprises a furnace body, a heating device and a smoke exhaust pipe, wherein one end of the smoke exhaust pipe is fixedly connected with a heat exchange chamber communicated with the inside of the furnace body, a hot gas pipe for communicating the heat exchange chamber with the heating device is fixedly connected onto the heat exchange chamber, a cold gas pipe communicated with the outside is fixedly arranged on the heat exchange chamber, a smoke outlet pipe communicated with the outside is fixedly connected onto the heat exchange chamber, a plurality of spiral heat exchange pipes are fixedly connected into the heat exchange chamber, and the smoke exhaust pipe is communicated with the smoke outlet pipe through the heat exchange. The invention achieves the effect of recycling the heat of the high-temperature flue gas and is applied to the heating furnace.

Description

Flue gas heat recovery heating furnace

Technical Field

The invention relates to the field of heating furnaces, in particular to a flue gas heat recovery heating furnace.

Background

The heating furnace includes a continuous heating furnace, a chamber heating furnace and the like. The heating furnace for heat treatment of metals is also called a heat treatment furnace. A furnace that heats or homogenizes the temperature inside a steel ingot before initial rolling is called a soaking furnace. In a broad sense, the heating furnace also includes a soaking furnace and a heat treatment furnace.

In forging and rolling production, the billet is typically heated in an oxidizing atmosphere of a complete combustion flame. The metal is directly heated by adopting incomplete combustion reducing flame (namely self-protection atmosphere), so that the aim of no oxidation or little oxidation can be fulfilled. This heating method is called open flame or open flame type non-oxidizing heating, and is successfully applied to rotary hearth furnaces and chamber furnaces.

Among the prior art, chinese utility model patent document with grant publication number CN207095320U discloses a mould heating furnace waste heat recovery system, including indirect heating equipment and control module, this mould heating furnace waste heat recovery system, but each item parameter and the function condition of real time monitoring waste heat recovery equipment in retrieving waste heat process to carry out reasonable regulation and control according to waste heat recovery equipment's actual behavior. This kind of mould heating furnace waste heat recovery system has adopted parallel arrangement's many with the structure of heat exchange tube, and the high temperature flue gas can be quick flow and discharge to the external world in this kind of structure, and this can make the heat transfer process of high temperature flue gas shortened, and the external high temperature flue gas of discharge still can carry a large amount of heats, and it is relatively poor to follow the thermal recycling effect of its carrying.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a flue gas heat recovery heating furnace, which enables heat carried by flue gas to be absorbed by air entering a heating device through a heat exchange chamber, so that the heat carried by the flue gas is utilized, and the high-efficiency utilization of resources is realized.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a flue gas heat recovery heating furnace, includes furnace body, heating device and the pipe of discharging fume, the one end fixedly connected with of the pipe of discharging fume and the heat transfer room of the inside intercommunication of furnace body, fixedly connected with is with the heat-transfer pipe of heat transfer room and heating device intercommunication on the heat transfer room, sets firmly the cold air duct with external intercommunication on the heat transfer room, fixedly connected with and external intercommunication go out the tobacco pipe on the heat transfer room, and a plurality of heliciform heat exchange tubes of the inside fixedly connected with of heat transfer room, the heat exchange tube will discharge fume the pipe and go out the tobacco pipe intercommunication.

Through adopting above-mentioned technical scheme, in the use, the flue gas that heating device burning dyestuff produced can rise in the furnace body is inside, and then flow to the heat transfer indoor portion through discharging fume the pipe, and then get into inside the spiral helicine heat exchange tube, inside the heat exchange tube, high temperature flue gas can further increase at the inside flow path of heat exchange tube, and so, get into the inside air of heat transfer indoor portion through the cold air duct, just can be abundant absorb the heat that comes from the high temperature flue gas on the heat exchange tube lateral wall, and then combustion-supporting in getting into combustion apparatus through the hot-air duct, so, the heat that produces when just can reduce combustion apparatus burning fuel has been by the absorbed volume of air, the heat that high temperature flue gas carried has been recycled simultaneously, environmental protection and resource make full use of's.

Preferably, the following steps: two adjacent heat exchange tubes are arranged in a staggered manner.

Through adopting above-mentioned technical scheme, through setting up two adjacent heat exchange tubes are crisscross for regional temperature is closer between two adjacent heat exchange tubes, makes the inside air of heat transfer room can be more efficient and the inside high temperature flue gas exchange heat of heat exchange tube, has reduced the different possibility of air temperature in different regions.

Preferably, the following steps: the outward convex part of the heat exchange tube extends into the inward concave part of the other heat exchange tube adjacent to the heat exchange tube.

Through adopting above-mentioned technical scheme, further improved the uniformity of regional temperature between two adjacent heat exchange tubes for the inside air of heat transfer chamber can be more efficient exchange heat with the inside high temperature flue gas of heat exchange tube, has reduced the different possibility of air temperature in different regions, makes the inside air of heat transfer chamber more contact with the lateral wall of heat exchange tube at the flow in-process simultaneously, has improved heat exchange efficiency.

Preferably, the following steps: the cold air pipe and the hot air pipe are respectively positioned at two opposite sides of the heat exchange chamber.

Through adopting above-mentioned technical scheme, compare in all locating the same one side of heat transfer room with cold air pipe and steam heating pipe, increased the flow path of the inside air of heat transfer room for the inside air of heat transfer room can be more with the lateral wall contact of heat exchange tube, further improved heat exchange efficiency.

Preferably, the following steps: the level of the cold air pipe is higher than that of the hot air pipe.

Through adopting above-mentioned technical scheme, because the cold air subsides downwards, the hot-air upwards promotes, so set up the entering heat transfer indoor portion that can be like this more with the lateral wall contact of heat exchange tube, the cold air is warmed up at the in-process that descends simultaneously, can have the trend of upwards promoting gradually, form the convection current with the cold air that just lets in the heat transfer indoor portion, the inside circulation of air speed of heat transfer indoor portion accelerates, make the flow of the inside formation air of heat transfer indoor portion, and the bottom temperature of heat exchange tube is less than the top temperature of heat exchange tube, further improve the contact between the lateral wall of air and heat exchange tube through this kind of form, further improved the heat transfer effect between air and the high temperature flue gas.

Preferably, the following steps: the heat exchange tubes are obliquely arranged, and the higher ends of the oblique heat exchange tubes are arranged close to the cold air tubes.

Through adopting above-mentioned technical scheme, get into the indoor portion air of heat transfer from the cold air duct and can be by the region that descends when the horizontal flow, after the air gets into the indoor portion of heat transfer, because the indoor portion of heat transfer has a large amount of air of comparing hotter with the external world, so just get into the indoor portion air of heat transfer and can flow to the below that inclines, set up the heat exchange tube like this and can further increase the possibility of just getting into contact between the indoor portion air of heat transfer and the lateral wall of heat exchange tube, further improved heat exchange efficiency.

Preferably, the following steps: and fins matched with the outline of the heat exchange tube are fixedly connected to the outer side wall of the heat exchange tube.

Through adopting above-mentioned technical scheme, establish the fin through adding and can increase the area of contact between heat exchange tube and the air, can further improve heat transfer effect.

Preferably, the following steps: the smoke outlet pipe is connected to the bottom of the heat exchange chamber, and the smoke outlet pipe is in threaded connection with a sealing cover which penetrates through one side wall of the smoke outlet pipe.

Through adopting above-mentioned technical scheme, through pulling down sealed lid, can clear up the inside of going out the tobacco pipe, because the heat exchange tube is the heliciform, so the flue gas can be limited at the inside flow velocity of heat exchange tube, and this can make more cigarette ashes fall inside the heat exchange tube, can clear up the inside jetting that carries out high temperature steam of heat exchange tube through pulling down sealed lid at this moment.

In summary, compared with the prior art, the invention has the following beneficial effects:

1. the heat carried by the flue gas can be absorbed by the air entering the heating device through the heat exchange chamber, so that the heat carried by the flue gas is utilized, and the high-efficiency utilization of resources is realized;

2. because the cold air subsides downwards, the hot-air upwards promotes, so set up the inside cold air of entering heat transfer room that can be more like this and the lateral wall contact of heat exchange tube, the cold air is warmed up at the in-process that descends simultaneously, can have the trend of upwards promoting gradually, form the convection current with the cold air that just lets in the heat transfer room inside, the inside circulation of air speed of heat transfer room is quickened, make the flow of the inside formation air of heat transfer room, and the bottom temperature of heat exchange tube is less than the top temperature of heat exchange tube, there is the difference in height through between cold air pipe and the steam pipe, contact between the lateral wall of heat exchange tube and the further improvement air such as heat exchange tube slope setting, the heat transfer effect between air and the high temperature flue gas has further been improved.

Drawings

FIG. 1 is an isometric view of an embodiment;

FIG. 2 is a schematic diagram showing the position of a heat exchange pipe in the embodiment;

FIG. 3 is a schematic view showing the position of the connection chamber in the embodiment;

fig. 4 is a large view of a portion a showing the fin structure in fig. 3.

Reference numerals: 1. a furnace body; 11. a heating device; 12. a smoke exhaust pipe; 13. a chimney; 2. a heat exchange chamber; 21. a cold air pipe; 22. a hot gas pipe; 23. discharging the smoke tube; 24. a sealing cover; 25. a fan; 3. a heat exchange pipe; 31. a connection chamber; 32. a baffle; 33. and a fin.

Detailed Description

Example (b): a flue gas heat recovery heating furnace, see figures 1 and 2, comprises a furnace body 1. The furnace body 1 is fixedly connected with a heating device 11 communicated with the furnace body, and the heating device 11 is used for igniting fuel and heating the interior of the furnace body 1. The top end of the furnace body 1 is fixedly connected with a smoke exhaust pipe 12. The smoke exhaust pipe 12 exhausts high-temperature smoke inside the furnace body 1. One end of the smoke exhaust pipe 12 is fixedly connected with the furnace body 1, the other end of the smoke exhaust pipe is fixedly connected with the heat exchange chamber 2, and the smoke exhaust pipe 12 is fixedly connected with the top of the heat exchange chamber 2. The heat exchange chamber 2 is arranged at one side of the furnace body 1, and the heat exchange chamber 2 is in a cuboid box shape. One side wall of the heat exchange chamber 2 is fixedly connected with an air cooling pipe 21 communicated with the heat exchange chamber 2, the heat exchange chamber 2 is connected with a hot air pipe 22 on the side wall opposite to one side of the air cooling pipe 21, one end of the hot air pipe 22 is fixedly connected with the heat exchange chamber 2, the other end of the hot air pipe is fixedly connected with the heating device 11, the heating device 11 is communicated with the heat exchange chamber 2 through the hot air pipe 22, and the hot air pipe 22 is fixedly connected with a fan 25 used for pumping air inside the heat exchange chamber 2 into the heating device 11. The level of the cold air duct 21 is higher than that of the hot air duct 22. When in use, a suction fan (not shown) is additionally arranged at the port of the cold air pipe 21 to suck outside air into the heat exchange chamber 2, and then the outside air is sent into the heating device 11 by the fan 25 on the hot air pipe 22.

Referring to fig. 2 and 3, a group of heat exchange tubes 3 arranged obliquely is fixedly connected inside the heat exchange chamber 2, and the higher end of the group of heat exchange tubes 3 is close to the cold air tube 21. The heat exchange tube 3 group is by eight groups totally twenty four heat exchange tubes 3 and constitutes, and eight groups heat exchange tube 3 distribute along the length direction of perpendicular to heat transfer chamber 2, and heat exchange tube 3 group is the cuboid form that eight groups heat exchange tube 3 constitute. The heat exchange tubes 3 are spiral, the two adjacent heat exchange tubes 3 are not abutted with each other, and the outer convex parts of the heat exchange tubes 3 extend into the inner concave parts of the heat exchange tubes 3 adjacent to the outer convex parts. The top and the bottom of the heat exchange tube 3 group are fixedly connected with a connecting chamber 31, the two ends of all the heat exchange tubes 3 are respectively fixedly connected with the two connecting chambers 31, the bottom surface of the heat exchange chamber 2 is fixedly connected with a smoke outlet tube 23, one end of the smoke outlet tube 23 is fixedly connected with a chimney 13, and the smoke outlet tube 23 communicates the chimney 13 with the heat exchange tubes 3. The connecting chamber 31 with lower horizontal position connects the heat exchange tube 3 with the smoke outlet tube 23; the connection chamber 31, which is horizontally high, communicates the heat exchange tube 3 with the smoke exhaust tube 12. The smoke outlet pipe 23 is in threaded connection with a sealing cover 24, the smoke outlet pipe 23 is divided into a vertical section and a horizontal section, the vertical section is directly and fixedly connected with the heat exchange chamber 2, the horizontal section is fixedly connected with the vertical section, and the sealing cover 24 is positioned at the bottom of the horizontal section. When the smoke outlet pipe 23 needs to be cleaned, the user can clean the inside of the smoke outlet pipe 23 by unscrewing the sealing cover 24.

Referring to fig. 3 and 4, the outer side wall of the heat exchange tube 3 is fixedly connected with a fin 33 matched with the profile thereof, that is, the fin 33 is helical, and two adjacent fins 33 are not abutted to each other. Two guide plates 32 are fixedly connected inside the heat exchange chamber 2, and the two guide plates 32 are arc-shaped and parallel and are arranged at an included angle with the length direction of the heat exchange chamber 2. One side of each of the two guide plates 32 is fixedly connected to the top surface and the bottom surface of the heat exchange chamber 2, the other side of each of the two guide plates 32 is fixedly connected to the two end surfaces of the heat exchange chamber 2, and the two ends of each of the two guide plates 32 are fixedly connected to the two side walls of the heat exchange chamber 2. The guide plate 32 close to the hot gas pipe 22 is fixedly connected with the top surface of the interior of the heat exchange chamber 2.

The working principle of the flue gas heat recovery heating furnace during use is as follows: in the use, the flue gas that heating device 11 burning dyestuff produced can rise in furnace body 1 inside, and then through discharging fume pipe 12 to 2 inside flows in heat transfer chamber, and then get into spiral helicine heat exchange tube 3 inside, inside heat exchange tube 3, the high temperature flue gas can further increase at the inside flow path of heat exchange tube 3, and so, get into the inside air of heat transfer chamber 2 through cold air duct 21, just can be abundant absorption heat that comes from the high temperature flue gas on the 3 lateral walls of heat exchange tube, and then it is combustion-supporting in getting into combustion apparatus through hot-air pipe 22, so, the heat that produces when just can reduce combustion apparatus burning fuel has been absorbed by the air the volume, the heat that high temperature flue gas carried has been recycled simultaneously, the effect of environmental protection and resource make full use of has been reached.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (8)

1. The utility model provides a flue gas heat recovery heating furnace, includes furnace body (1), heating device (11) and tub (12) of discharging fume, its characterized in that: the flue gas exhaust device is characterized in that one end of the flue gas exhaust pipe (12) is fixedly connected with a heat exchange chamber (2) communicated with the interior of the furnace body (1), a hot gas pipe (22) communicated with the heat exchange chamber (2) and the heating device (11) is fixedly connected to the heat exchange chamber (2), a fan (25) used for sucking gas in the heat exchange chamber (2) into the heating device (11) is fixedly connected to the hot gas pipe (22), a cold gas pipe (21) communicated with the outside is fixedly arranged on the heat exchange chamber (2), a flue gas exhaust pipe (23) communicated with the outside is fixedly connected to the heat exchange chamber (2), a plurality of spiral heat exchange pipes (3) are fixedly connected to the interior of the heat exchange chamber (2), and the flue gas exhaust pipe (12) and the flue gas exhaust pipe (23) are.

2. The flue gas heat recovery heating furnace according to claim 1, characterized in that: the two adjacent heat exchange tubes (3) are arranged in a staggered manner.

3. The flue gas heat recovery heating furnace according to claim 2, characterized in that: the outward convex part of the heat exchange tube (3) extends into the inward concave part of the other heat exchange tube (3) adjacent to the heat exchange tube.

4. The flue gas heat recovery heating furnace according to claim 3, characterized in that: the cold air pipe (21) and the hot air pipe (22) are respectively positioned at two opposite sides of the heat exchange chamber (2).

5. The flue gas heat recovery heating furnace according to claim 4, characterized in that: the level of the cold air pipe (21) is higher than that of the hot air pipe (22).

6. The flue gas heat recovery heating furnace according to claim 5, characterized in that: the heat exchange tubes (3) are obliquely arranged, and the higher ends of the oblique heat exchange tubes (3) are arranged close to the cold air tubes (21).

7. The flue gas heat recovery heating furnace according to claim 6, characterized in that: and fins (33) matched with the profile of the heat exchange tube (3) are fixedly connected to the outer side wall of the heat exchange tube (3).

8. The flue gas heat recovery heating furnace according to claim 7, characterized in that: the smoke outlet pipe (23) is connected to the bottom of the heat exchange chamber (2), and the smoke outlet pipe (23) is in threaded connection with a sealing cover (24) which penetrates through one side wall of the smoke outlet pipe (23).

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