CN215571252U

CN215571252U - Hot-blast stove

Info

Publication number: CN215571252U
Application number: CN202120806014.8U
Authority: CN
Inventors: 刘超
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2022-01-18
Anticipated expiration: 2031-04-19

Abstract

The utility model discloses a hot blast stove which comprises a combustion stove body and a heat exchanger, wherein a combustion chamber is arranged in the combustion stove body; the heat exchanger is arranged above the combustion furnace body and comprises a shell and a first heat exchange tube, and a heat exchange air channel is formed in the shell; the outer wall of first heat exchange tube is equipped with heat transfer fin, first heat exchange tube is located in the casing, and be located in the heat transfer wind channel, the mouth of pipe of first heat exchange tube one end with the combustion chamber intercommunication, the mouth of pipe intercommunication of the other end the exterior space of casing, so that the thermal current warp that produces in the combustion chamber circulates through first heat exchange tube. The hot blast stove adopting the technical scheme of the utility model can improve the heat exchange efficiency.

Description

Hot-blast stove

Technical Field

The utility model relates to the technical field of drying equipment, in particular to a hot blast stove.

Background

In the related art hot blast stove, a medium is generally burned in a combustion furnace, so that heat energy in a heat exchange pipe is collected for use by burning the outer wall of the heat exchange pipe. However, in the structure of the hot blast stove, the area of the pipe wall of the burning heat exchange pipe is large, and the area for collecting heat energy from the pipe orifice of the heat exchange pipe is relatively small, so that the heat exchange efficiency is very low.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a hot blast stove, aiming at improving the heat exchange efficiency.

In order to achieve the above object, the present invention provides a hot blast stove comprising:

the combustion furnace comprises a combustion furnace body, wherein a combustion chamber is arranged in the combustion furnace body; and

the heat exchanger is arranged above the combustion furnace body and comprises a shell and a first heat exchange tube, and a heat exchange air channel is formed in the shell; the outer wall of first heat exchange tube is equipped with heat transfer fin, first heat exchange tube is located in the casing, and be located in the heat transfer wind channel, the mouth of pipe of first heat exchange tube one end with the combustion chamber intercommunication, the mouth of pipe intercommunication of the other end the exterior space of casing, so that the thermal current warp that produces in the combustion chamber circulates through first heat exchange tube.

Optionally, the heat exchange fins are spirally wound along the length direction of the first heat exchange tube.

Optionally, the number of the first heat exchange tubes is multiple, multiple rows of the first heat exchange tubes are arranged to form multiple rows, the multiple rows of the first heat exchange tubes are arranged at intervals along the airflow direction of the heat exchange air duct, and the two adjacent rows of the first heat exchange tubes are arranged in a staggered manner.

Optionally, the heat exchanger further comprises a cover body and a second heat exchange tube, the cover body is detachably connected to the top of the shell and encloses with the shell to form a diversion space, and a tube orifice of one end, far away from the combustion chamber, of the first heat exchange tube is communicated with the diversion space; the second heat exchange tube is arranged in the shell and positioned in the heat exchange air channel, a tube opening at one end of the second heat exchange tube is communicated with the diversion space, and a tube opening at the other end of the second heat exchange tube is communicated with the external space of the shell, so that heat flow in the combustion chamber sequentially passes through the first heat exchange tube, the diversion space and the second heat exchange tube for circulation.

Optionally, the heat exchanger further comprises a third heat exchange tube and a fourth heat exchange tube which are positioned in the heat exchange air flue, the bottom of the shell is provided with a baffle plate, the baffle plate and the shell enclose to form a first circulation space, the cover body and the shell body further enclose to form a second circulation space separated from the diversion space, a pipe orifice at one end of the second heat exchange pipe, which is far away from the flow transfer space, is communicated with the first flow-through space, a pipe orifice at one end of the third heat exchange pipe is communicated with the first circulation space, a pipe orifice at the other end of the third heat exchange pipe is communicated with the second circulation space, a pipe orifice at one end of the fourth heat exchange pipe is communicated with the second circulation space, a pipe orifice at the other end of the fourth heat exchange pipe is communicated with the external space of the shell, so that the heat flow passing through the second heat exchange tube flows through the first flow-through space, the third heat exchange tube, the second flow-through space and the fourth heat exchange tube in sequence.

Optionally, the bottom of casing is provided with the case of discharging fume, install the water tank in the case of discharging fume, the case of discharging fume is equipped with into smoke mouth and exhaust port, advance the smoke mouth with first heat exchange tube keeps away from the mouth of pipe intercommunication of combustion chamber one end, so that first heat exchange tube exhaust heat flow can via advance the smoke mouth and get into in the case of discharging fume, and the warp the exhaust port is discharged.

Optionally, a smoke passing pipe is arranged in the water tank, the smoke passing pipe penetrates through two opposite side walls of the water tank, and the smoke passing pipe is connected with the water tank in a sealing manner, so that heat flow in the smoke discharging box can circulate through the smoke passing pipe.

Optionally, a heat collecting sheet is arranged on the outer side wall of the smoke passing pipe, and the heat collecting sheet is located in the water tank.

Optionally, a water level control valve is arranged on the water tank;

and/or an exhaust pipe is arranged on the water tank.

Optionally, a dust remover is connected to the smoke exhaust.

According to the hot blast stove adopting the technical scheme, the heat exchanger is arranged above the combustion stove body, so that hot air flow generated in the combustion chamber can better enter the heat exchanger; the heat exchange air channel is arranged in the shell of the heat exchanger, the first heat exchange tube is positioned in the heat exchange air channel, the tube opening at one end of the first heat exchange tube is communicated with the combustion chamber, and the tube opening at the other end of the first heat exchange tube is communicated with the outer space of the shell, so that when a medium is combusted in the combustion chamber, hot air generated in the combustion chamber can circulate in the first heat exchange tube, heat energy is gathered on the tube wall, and the heat energy on the tube wall of the first heat exchange tube is collected and taken away by utilizing the air flow in the heat exchange air channel. In the structure, because the hot air flow of the combustion chamber acts in the first heat exchange tube and the heat energy is collected through the tube wall of the first heat exchange tube, the area for taking heat is enlarged, and the heat exchange efficiency of the hot blast stove is greatly improved. Further, among the technical scheme of this application, set up heat transfer fin through the outer wall at first heat exchange tube to can utilize heat transfer fin to collect heat energy, further increase heat transfer area, and then make heat exchange efficiency better.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic front view of an embodiment of a hot blast stove according to the present invention; wherein the arrow direction is the airflow direction;

FIG. 2 is a side view of FIG. 1; wherein the arrow direction is the airflow direction;

FIG. 3 is a schematic top view showing a partial structure of a heat exchanger in a hot blast furnace according to the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

fig. 5 is a partially enlarged view of fig. 2 at B.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The present invention proposes a hot blast stove 100.

Referring to fig. 1, fig. 2 and fig. 4, in an embodiment of the present invention, the hot blast stove 100 includes:

the combustion furnace comprises a combustion furnace body 10, wherein a combustion chamber 11 is arranged in the combustion furnace body 10; and

the heat exchanger 30 is arranged above the combustion furnace body 10, the heat exchanger 30 comprises a shell 31 and a first heat exchange pipe 32, and a heat exchange air flue 30a is formed in the shell 31; the outer wall of first heat exchange tube 32 is equipped with heat transfer fin 321, first heat exchange tube 32 is located in the casing 31, and be located in the heat transfer wind channel 30a, the mouth of pipe of first heat exchange tube 32 one end with combustion chamber 11 intercommunication, the mouth of pipe intercommunication of the other end the exterior space of casing 31, so that the thermal current via that produces in the combustion chamber 11 first heat exchange tube 32 circulates.

Specifically, the combustion chamber 11 is mainly used for combustion media, such as combustion gas media, oil media or biological particles, to exchange heat. In this embodiment, an ash removing chamber 12 is further provided in the combustion furnace body 10, the ash removing chamber 12 is located below the combustion chamber 11, and a fire grate is provided between the ash removing chamber 12 and the combustion chamber 11. The front side of the combustion chamber 11 is provided with a fuel port, and the fuel port is provided with an openable and closable door 111, so that a combustion medium can be added through the fuel port after the door 111 is opened. The ash removing chamber 12 is provided at a front side thereof with an ash removing opening, and the ash removing opening is provided with an ash removing door 121, so that the ash flowing from the combustion chamber 11 to the ash removing chamber 12 can be cleaned after the ash removing door 121 is opened.

In an embodiment of the present application, the hot blast stove 100 further includes a combustion fan 20 and an alarm (not shown), and the alarm is in signal connection with the combustion fan 20. The combustion-supporting fan 20 is used for delivering airflow to the combustion chamber 11 for supporting combustion, and in practical application, after the furnace door 111 is closed, the combustion-supporting fan 20 is started to support combustion; after the door 111 is opened, the combustion fan 20 is stopped. After the set temperature is reached, the combustion fan 20 is automatically stopped, and when the temperature is lower than the set temperature, the combustion fan can be automatically started. After the combustion fan 20 is started, when the combustion substance is insufficient and the combustion fan 20 is still not stopped within the preset time, the alarm connected with the signal is started to give an alarm to remind an operator to add fuel.

Further, the number of burner bodies 10 may be 1, 2 or more, thereby forming a single, double or multiple door 111 stove 100. When the number of the burner bodies 10 is multiple, the combustion chambers of the burner bodies 10 are communicated with the first heat exchange pipes 32 for heat exchange. Therefore, when the combustion is carried out for heat extraction, the corresponding number of the furnace doors 111 can be opened according to the actual heat extraction requirement for combustion heat extraction, and the selection is flexible. And the connecting plate body, the fire grate and the like in the combustion chamber 11 are not easy to deform.

The top wall and the bottom wall of the shell 31 are provided with openings matched with the pipe diameter of the first heat exchange pipe 32, two ends of the first heat exchange pipe 32 are fixed at the openings of the shell 31, so that the first heat exchange pipe 32 is kept fixed in the shell 31, the shell 31 is arranged above the combustion chamber 11, the hot blast stove 100 is further provided with a smoke exhaust fan, heat flow and smoke in the combustion chamber 11 are guided to enter the first heat exchange pipe 32 through the opening of the bottom wall of the shell 31 and flow out from the opening of the top wall of the shell 31, and therefore when the heat flow and the smoke circulate in the first heat exchange pipe 32, high-temperature heat is accumulated on the pipe wall of the first heat exchange pipe, and the heat flow and the smoke are taken away through a heat exchange air duct 30a in the shell 31.

The heat exchange fins 321 can be round metal sheets and surround the outer wall of the first heat exchange tube 32, and the heat exchange fins 321 can also collect heat energy in the first heat exchange tube 32, so that when the airflow of the heat exchange air duct 30a blows through the first heat exchange tube 32, the heat energy at the tube wall and on the heat exchange fins 321 is taken away, and the heat exchange area is increased.

In this embodiment, the outer sides of the burner body 10 and the heat exchanger 30 are further covered with heat insulation cotton, so that the heat energy can be prevented from flowing outwards through the heat insulation cotton.

Therefore, according to the hot blast stove 100 provided by the technical scheme of the utility model, the heat exchanger 30 is arranged above the combustion stove body 10, so that hot air flow generated in the combustion chamber 11 can better enter the heat exchanger 30; through arranging the heat exchange air duct 30a in the shell 31 of the heat exchanger 30, and positioning the first heat exchange tube 32 in the heat exchange air duct 30a, meanwhile, the nozzle at one end of the first heat exchange tube 32 is communicated with the combustion chamber 11, and the nozzle at the other end is communicated with the outer space of the shell 31, so that when a medium is combusted in the combustion chamber 11, hot air generated in the combustion chamber 11 can circulate in the first heat exchange tube 32, and heat energy is gathered on the tube wall, and further, the heat energy on the tube wall of the first heat exchange tube 32 is collected and taken away by utilizing the air flow in the heat exchange air duct 30 a. In the structure, because the hot air flow of the combustion chamber 11 acts in the first heat exchange tube 32 and the heat energy is collected through the tube wall of the first heat exchange tube 32, the heat taking area is larger, and the heat exchange efficiency of the hot blast stove 100 is greatly improved. Further, among the technical scheme of this application, set up heat transfer fin 321 through the outer wall at first heat exchange tube 32 to can utilize heat transfer fin 321 to collect heat energy, further increase heat transfer area, and then make heat exchange efficiency better.

Further, in the present application, the heat exchange fins 321 are spirally wound along the length direction of the first heat exchange tube 32. So set up, can further increase the heat transfer area of first heat exchange tube 32 to further improve the efficiency of heat transfer.

Referring to fig. 3 in combination, in an embodiment of the present application, the number of the first heat exchange tubes 32 is multiple, multiple rows of the first heat exchange tubes 32 are arranged, the multiple rows of the first heat exchange tubes 32 are arranged at intervals along the airflow direction of the heat exchange air duct 30a, and the adjacent two rows of the first heat exchange tubes 32 are arranged in a staggered manner.

In this embodiment, the central line of the first heat exchange tube 32 in each row is perpendicular to the airflow direction of the heat exchange air duct 30a, that is, the airflow of the heat exchange air duct 30a blows towards the first heat exchange tube 32, so that the heat exchange between the airflow of the heat exchange air duct 30a and the first heat exchange tube 32 is facilitated. And the first heat exchange tubes 32 in two adjacent rows are arranged in a staggered manner, so that when air flows blow through the first heat exchange tubes 32 in one row, the air flows can blow on the first heat exchange tubes 32 in the next row in a head-on manner, and cannot blow through gaps between the first heat exchange tubes 32, so that the air flows in the heat exchange air duct 30a can perform sufficient heat exchange with the first heat exchange tubes 32.

Referring to fig. 2, in order to increase the residence time of the hot stream and the flue gas exhausted from the combustion chamber 11 in the heat exchanger 30, sufficient heat exchange is performed in the heat exchange duct 30 a. In an embodiment of the present application, the heat exchanger 30 further includes a cover 36 and a second heat exchange tube 33, the cover 36 is detachably connected to the top of the casing 31, and encloses with the casing 31 to form a diversion space 361, and a tube orifice of one end of the first heat exchange tube 32, which is far away from the combustion chamber 11, is communicated with the diversion space 361; the second heat exchange tube 33 is arranged in the shell 31 and positioned in the heat exchange air channel 30a, a tube opening at one end of the second heat exchange tube 33 is communicated with the flow transfer space 361, and a tube opening at the other end is communicated with the external space of the shell 31, so that heat flow in the combustion chamber 11 sequentially passes through the first heat exchange tube 32, the flow transfer space 361 and the second heat exchange tube 33.

In this embodiment, the second heat exchanging tube 33 is disposed in parallel with the first heat exchanging tube 32, that is, the length directions of the first heat exchanging tube 32 and the second heat exchanging tube 33 are both perpendicular to the airflow direction of the heat exchanging air duct 30a, and the second heat exchanging tube 33 and the first heat exchanging tube 32 are installed and arranged in the same manner. The cover 36 can be detachably connected to the top of the housing 31 by means of screw connection or snap connection, so that the top of the housing 31 and the pipe openings at one ends of the first heat exchanging pipe 32 and the second heat exchanging pipe 33 can be exposed after the cover 36 is detached, thereby facilitating cleaning and maintenance. In practical application, when heat flow and flue gas are generated in the combustion chamber 11, the heat flow and the flue gas are guided by the flue gas exhaust fan, and firstly enter the first heat exchange pipe 32 through the bottom of the shell 31, then enter the diversion space 361 through the first heat exchange pipe 32, and then are discharged to the bottom of the shell 31 through the second heat exchange pipe 33. In the process, as the heat flow and the flue gas pass through the circulation path from bottom to top and then from top to bottom, the residence time in the heat exchange air duct 30a is increased, which is beneficial to fully performing heat exchange.

With continued reference to fig. 2, further, the heat exchanger 30 further includes a third heat exchanging tube 34 and a fourth heat exchanging tube 35 located in the heat exchanging air duct 30a, a baffle 40 is disposed at the bottom of the casing 31, the baffle 40 and the casing 31 enclose to form a first flow space 41, the cover 36 and the casing 31 further enclose to form a second flow space 362 separated from the flow transfer space 361, a tube opening of one end of the second heat exchanging tube 33 far from the flow transfer space 361 communicates with the first flow space 41, a tube opening of one end of the third heat exchanging tube 34 communicates with the first flow space 41, a tube opening of the other end communicates with the second flow space 362, a tube opening of one end of the fourth heat exchanging tube 35 communicates with the second flow space 362, and a tube opening of the other end communicates with the external space of the casing 31, so that heat flowing through the second heat exchanging tube 33 sequentially passes through the first flow space 41, the second flow space, the third flow space, the second flow space 362, and the third flow space and the fourth flow space 362, The third heat exchanging pipe 34, the second circulating space 362 and the fourth heat exchanging pipe 35 circulate.

The baffle 40 can be provided with a first access opening 42 to communicate with the first flow-through space 41, and the second heat exchange tube 33 and the third heat exchange tube 34 can be cleaned and overhauled through the first access opening 42. The arrangement of the first circulation space 41, the second circulation space 362, the third heat exchange tube 34 and the fourth heat exchange tube 35 can make the heat flow and the flue gas exhausted by the second heat exchange tube 33 enter the heat exchange air duct 30a again for heat exchange, and thus the heat flow and the flue gas pass through the heat exchange air duct 30a back and forth for many times, so that the time spent in the heat exchange air duct 30a is further increased, and the heat exchange efficiency is improved. It will be appreciated that in other embodiments, more recirculation loops may be provided, as desired.

In this application embodiment, the bottom of casing 31 is provided with the case 50 of discharging fume, install water tank 60 in the case 50 of discharging fume, the case 50 of discharging fume is equipped with into smoke mouth and exhaust port 51, advance the smoke mouth with first heat exchange tube 32 keeps away from the mouth of pipe intercommunication of 11 one ends in combustion chamber, so that first heat exchange tube 32 exhaust heat flow can via advance the smoke mouth and get into in the case 50 of discharging fume, and the warp exhaust port 51 discharges.

In this embodiment, the water tank 60 may be installed at the rear side of the burner block 10, and a drain valve 64 is provided at the bottom of the water tank 60, and the drain valve 64 is connected to a drain pipe to the outside to take water. The bottom of smoke discharging box 50 is provided with a second access hole 52, and the smoke discharging box 50 can be cleaned and maintained through the second access hole 52. Therefore, in the using process, after the heat flow discharged by the first heat exchange tube 32 sequentially passes through the diversion space 361, the second heat exchange tube 33, the first circulation space 41, the third heat exchange tube 34, the second circulation space 362 and the fourth heat exchange tube 35, the heat flow enters the smoke exhaust box 50 through the smoke inlet, the waste heat entering the smoke exhaust box 50 can heat the water in the water tank 60, and then the waste heat is discharged through the smoke outlet 51.

Furthermore, a smoke passing pipe 61 is arranged in the water tank 60, the smoke passing pipe 61 penetrates through two opposite side walls of the water tank 60, and the smoke passing pipe 61 is hermetically connected with the water tank 60, so that heat flow in the smoke discharging box 50 can circulate through the smoke passing pipe 61.

Wherein, but the material heat conduction material of passing tobacco pipe 61, the quantity of passing tobacco pipe 61 can be a plurality of, and a plurality of passing tobacco pipes 61 set up at the interval on water tank 60, pass the setting of tobacco pipe 61 for the heat flow and the flue gas in the case 50 of discharging fume can circulate in the inside of water tank 60, and pass the sealing connection of tobacco pipe 61 and water tank 60 lateral wall, can ensure again that can not leak owing to set up passing tobacco pipe 61. Therefore, by arranging the smoke tube 61, the liquid in the water tank 60 can exchange heat with the tube wall of the smoke tube 61, thereby improving the heating efficiency of the water tank 60.

With reference to fig. 5, further, the outer side wall of the smoke passing pipe 61 is provided with a heat collecting sheet 611, and the heat collecting sheet 611 is located in the water tank 60. The heat collecting sheet 611 can be a metal sheet sleeved on the outer wall of the smoke passing tube 61, and as can be understood, the arrangement of the heat collecting sheet 611 increases the area of the water tank 60 where the liquid can contact and exchange heat, thereby being more beneficial to improving the efficiency of heating the liquid in the water tank 60.

In an embodiment of the present application, a water level control valve 62 is disposed on the water tank 60. The water level control valve 62 can be a valve body commonly used in the prior art, when the water level in the water tank 60 is reduced by the water level control valve 62 and exceeds a preset value, the ball float valve is opened, the pressure of the upper chamber of the piston is reduced, a pressure difference is formed between the upper part and the lower part of the piston, and the valve clack is opened under the action of the pressure difference to perform water supply operation; when the water level rises to a preset height, the ball float valve is closed, and the pressure of the upper chamber of the piston is continuously increased to cause the valve clack to be closed to stop water supply. The liquid level is controlled to the set height in a reciprocating and automatic mode, and the automatic water supply function is achieved.

Furthermore, the water tank 60 is provided with an exhaust pipe 63, and the exhaust pipe 63 can automatically exhaust high-temperature water vapor generated by liquid boiling in the water tank 60, so that potential safety hazards caused by the accumulation of the high-temperature water vapor in the water tank 60 are avoided.

Further, in this application exhaust port 51 is connected with the dust remover (not shown), and the dust remover can be for the smoke and dust filter equipment who uses more often among the prior art, through setting up the dust remover, can discharge again after filtering via exhaust port 51 exhaust flue gas, has ensured that hot-blast furnace 100 exhaust flue gas can not cause the pollution to the environment at last, accords with the environmental protection requirement.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A hot blast stove, comprising:

2. The stove of claim 1, wherein the heat exchange fins are arranged in a spiral coil along the length of the first heat exchange tube.

3. The hot blast stove according to claim 1, wherein the number of the first heat exchange tubes is plural, a plurality of the first heat exchange tubes are arranged to form a plurality of rows, the plurality of rows of the first heat exchange tubes are arranged at intervals along the airflow direction of the heat exchange air duct, and the first heat exchange tubes in two adjacent rows are arranged in a staggered manner.

4. The hot blast stove according to claim 1, wherein the heat exchanger further comprises a cover body and a second heat exchange tube, the cover body is detachably connected to the top of the shell and encloses with the shell to form a flow diversion space, and a tube orifice of one end of the first heat exchange tube, which is far away from the combustion chamber, is communicated with the flow diversion space; the second heat exchange tube is arranged in the shell and positioned in the heat exchange air channel, a tube opening at one end of the second heat exchange tube is communicated with the diversion space, and a tube opening at the other end of the second heat exchange tube is communicated with the external space of the shell, so that heat flow in the combustion chamber sequentially passes through the first heat exchange tube, the diversion space and the second heat exchange tube for circulation.

5. The hot blast stove according to claim 4, wherein the heat exchanger further comprises a third heat exchange tube and a fourth heat exchange tube which are arranged in the heat exchange air flue, the bottom of the shell is provided with a baffle plate, the baffle plate and the shell enclose to form a first circulation space, the cover and the shell also enclose to form a second circulation space separated from the circulation space, a tube orifice at one end of the second heat exchange tube, which is far away from the circulation space, communicates with the first circulation space, a tube orifice at one end of the third heat exchange tube communicates with the first circulation space, a tube orifice at the other end communicates with the second circulation space, a tube orifice at one end of the fourth heat exchange tube communicates with the second circulation space, and a tube orifice at the other end communicates with the outer space of the shell, so that heat flow passing through the second heat exchange tube sequentially passes through the first circulation space, the third heat exchange tube, the fourth heat exchange tube, The second circulation space and the fourth heat exchange tube circulate.

6. The hot blast stove according to any one of claims 1 to 5, wherein a smoke exhaust box is arranged at the bottom of the shell, a water tank is arranged in the smoke exhaust box, the smoke exhaust box is provided with a smoke inlet and a smoke outlet, and the smoke inlet is communicated with a pipe orifice of one end of the first heat exchange pipe, which is far away from the combustion chamber, so that heat flow exhausted by the first heat exchange pipe can enter the smoke exhaust box through the smoke inlet and be exhausted through the smoke outlet.

7. The hot blast stove according to claim 6, wherein a smoke passing pipe is provided in the water tank, the smoke passing pipe penetrates through two opposite side walls of the water tank, and the smoke passing pipe is hermetically connected with the water tank, so that heat flow in the smoke discharging box can circulate through the smoke passing pipe.

8. The hot blast stove according to claim 7, wherein the outer side wall of the flue pipe is provided with heat collecting fins, and the heat collecting fins are located in the water tank.

9. The hot blast stove according to claim 6, wherein the water tank is provided with a water level control valve;

and/or an exhaust pipe is arranged on the water tank.

10. The hot blast stove according to claim 6, wherein the smoke outlet is connected to a dust remover.