CN107477865B

CN107477865B - Hot-blast stove

Info

Publication number: CN107477865B
Application number: CN201710731457.3A
Authority: CN
Inventors: 李军明; 贺俊; 李练兵; 罗艳; 刘艳华; 李铁辉; 陈济恩
Original assignee: Hunan Nongyou Shengtai Agricultural Technology Co ltd; Hunan Nongyou Machinery Group Co ltd
Current assignee: Hunan Nongyou Shengtai Agricultural Technology Co ltd; Hunan Nongyou Machinery Group Co ltd
Priority date: 2017-08-23
Filing date: 2017-08-23
Publication date: 2020-12-15
Anticipated expiration: 2037-08-23
Also published as: CN107477865A

Abstract

The application discloses hot-blast furnace, including the stove outer covering, be equipped with furnace in the stove outer covering, be connected with first air-supply line on the furnace, be equipped with the export on the first air-supply line, the export is located in the furnace, be equipped with whirl air generator in the export, whirl air generator is used for following the wind that the export came out becomes whirl wind, first air-supply line is kept away from furnace's one end is connected with the air-blower. According to the hot blast stove provided by the invention, the swirl air generator is arranged at the outlet of the first air inlet pipe, so that swirl air can be provided for the hearth, uniform and sufficient oxygen can be provided for fuel in the hearth, and meanwhile, the swirl air has a good turning effect on the fuel, so that the fuel in the hot blast stove is not easy to coke and agglomerate, and the fuel can be fully combusted.

Description

Hot-blast stove

Technical Field

The invention belongs to the technical field of combustion stoves, and particularly relates to a hot blast stove.

Background

With the development of society and the progress of technology, people pay more and more attention to the protection of the environment. In recent years, due to the increasing shortage of traditional energy sources, a series of harmful gases can be generated after fuels such as coal, coke, diesel oil and coal gas are combusted, and the environment and the human health are seriously affected; the biomass fuel is inexhaustible, and the harmful gas generated in the combustion process is less than that of the traditional fuel, so that the development, the cyclic utilization and the production of the biomass fuel are paid unprecedented attention. The raw material of the biomass fuel is mainly agricultural and forestry waste which is processed in a series of ways and then is burnt to be converted into biomass energy, so that alternative energy is provided for industry.

The biomass fuel is usually combusted through a biomass hot blast stove to realize energy conversion, and the biomass hot blast stove converts chemical energy of the biomass fuel into heat energy and supplies the heat energy to corresponding equipment in a hot air mode. The existing biomass hot blast stove mainly comprises a fuel bin, a combustion chamber and a heat exchange chamber, biomass fuel in the fuel bin enters the combustion chamber and is combusted in the combustion chamber, hot flue gas generated by combustion and air blown into the heat exchange chamber carry out heat exchange, then cold flue gas is discharged through a smoke outlet, and the hot air is supplied to corresponding equipment. However, the biomass fuel generally has the characteristics of uneven fuel size, high water content, high ash content and the like, so that the combustion process is complex. The existing hot blast stove has incomplete fuel combustion due to the structure, thereby causing low thermal efficiency and easy occurrence of coking phenomenon.

Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a hot blast stove capable of fully burning biomass fuel.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a hot blast stove which can provide swirl air into a hearth so as to uniformly supply oxygen into the hearth, and meanwhile, the swirl air has a good turning effect on fuel so as to ensure that the fuel in the hot blast stove is not easy to coke and agglomerate in the combustion process, thereby enabling the fuel to be fully combusted.

The technical scheme provided by the invention is as follows:

the hot blast stove comprises a stove shell, wherein a hearth is arranged in the stove shell, a first air inlet pipe is connected onto the hearth, an outlet is formed in the first air inlet pipe and located in the hearth, a rotational flow air generator is arranged on the outlet and used for converting air coming out from the outlet into rotational flow air, and an air blower is connected to one end, far away from the hearth, of the first air inlet pipe.

Furthermore, the rotational flow wind generator comprises a generator main body and at least two wind guide pipes, wherein the generator main body is communicated with the first air inlet pipe, and the wind guide pipes are used for enabling wind coming out of the first air inlet pipe to enter the hearth along a spiral track.

Furthermore, the hearth comprises a first hearth and a second hearth, the first hearth and the second hearth are arranged in parallel and communicated at the top, and the first air inlet pipe is communicated with the bottom of the first hearth.

Further, the air outlet of the air blower is connected with an air box, the first air inlet pipe is communicated with the air box, a second air inlet pipe is further communicated with the air box, and the second air inlet pipe is communicated with the upper portion of the first hearth.

Furthermore, a third air inlet pipe is communicated with the air box and communicated with the second hearth.

Further, a heat exchange chamber is arranged in the furnace shell and communicated with the second hearth.

Furthermore, the heat exchange chamber comprises a first heat exchange chamber and a second heat exchange chamber, the bottom of the first heat exchange chamber is communicated with the second hearth, and the top of the first heat exchange chamber is communicated with the top of the second heat exchange chamber.

Furthermore, first heat transfer room includes at least one first cooling tube, first cooling tube bottom with second furnace intercommunication, just the top of first cooling tube communicates, and with second heat transfer room top intercommunication.

Furthermore, the second heat exchange chamber comprises at least one second heat radiating pipe, the top of the second heat radiating pipe is communicated with the first heat exchange chamber, and the bottom of the second heat radiating pipe is communicated.

Furthermore, the bottom of the second heat exchange chamber is provided with a second ash settling chamber, the second ash settling chamber is communicated with the bottom of the dust removal chamber, and the dust removal chamber is provided with at least one layer of dust removal net.

According to the hot blast stove provided by the invention, the outlet of the first air inlet pipe is provided with the rotational flow air generator, air from the first air inlet pipe is changed into rotational flow air through the rotational flow air generator to be supplied into the hearth, the air direction of the rotational flow air is uneven and is continuously changed in the flowing process, so that not only is uniform and sufficient oxygen provided for the combustion of fuel in the hearth, but also the rotational flow air has a good turning effect on the fuel, the fuel in the hot blast stove is not easy to coke and agglomerate, and the fuel can be fully combusted.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be 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 described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a hot blast stove provided by an embodiment of the invention;

FIG. 2 is an enlarged view of the vortex wind generator of FIG. 1;

FIG. 3 is a top view of the vortex wind generator of FIG. 2;

FIG. 4 is a schematic view illustrating the flow of hot gas generated in a hot blast stove according to an embodiment of the present invention;

fig. 5 is a schematic flow diagram of the cold air for heat exchange according to the embodiment of the present invention.

Description of reference numerals: a furnace shell 1; an air inlet 101; an air outlet 102; a hearth 2; a first furnace chamber 201; a second hearth 202; a first air inlet duct 3; a blower 4; a swirling flow wind generator 5; a generator main body 501; an air guide duct 502; a bellows 6; a second air inlet pipe 7; a third air inlet pipe 8; a heat exchange chamber 9; a first heat exchange chamber 901; a second heat exchange chamber 902; a first ash settling chamber 10; a second ash settling chamber 11; a dust chamber 12; a feed port 13; a feeding machine 14; a furnace bridge 15; a lower oven door 16; an upper oven door 17; a first cleaning port 18; a second cleaning port 19; an induced draft fan 20.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.

It should be noted that the swirling wind described in the present application is wind with an uneven wind direction, and the wind direction of the swirling wind may be changed continuously during the flowing process.

As shown in fig. 1 to 5, the hot blast stove provided in this embodiment includes a stove shell 1, a hearth 2 is provided in the stove shell 1, a first air inlet pipe 3 is connected to the hearth 2, an outlet is provided on the first air inlet pipe 3, the outlet is located in the hearth 2, a swirling flow air generator 5 is provided on the outlet, the swirling flow air generator 5 is configured to convert air coming out from the outlet into swirling flow air, and an air blower 4 is connected to one end of the first air inlet pipe 3 away from the hearth 2.

The hot-blast furnace that this embodiment provided, set up whirl wind generator 5 through the export at first air-supply line 3, the wind that comes out from first air-supply line 3 becomes supply in whirl wind direction furnace 2 through whirl wind generator 5, the wind direction of whirl wind is inhomogeneous and constantly take place to change at the flow process, not only for the burning of 2 interior fuel in furnaces provides even, sufficient oxygen, whirl wind has good effect of stirring to fuel moreover, make the difficult coking of hot-blast furnace fuel, the caking, thereby make fuel can the abundant burning. The cyclone wind generator 5 is provided to mix the wind from the first air inlet pipe 3 and change the single wind direction of the wind supplied from the first air inlet pipe 3, thereby supplying cyclone wind having different wind directions to the furnace 2 and supplying uniform and sufficient oxygen to the furnace 2.

In this embodiment, the fuel is biomass fuel, is equipped with feed inlet 13 on furnace 2, and feeder 14 carries the fuel from feed inlet 13 to furnace 2 in, and the fuel falls into on the furnace bridge 15 of furnace 2 lower part to the burning produces the heat, and first air-supply line 3 is connected on furnace 2 of furnace bridge 15 lower part and is stretched into the central point of furnace 2, and the export of first air-supply line 3 is vertical upwards, provides the whirl wind to furnace 2 through whirl wind generator 5, makes the fuel burning abundant. The cavity for ventilation is arranged between the furnace shell 1 and the hearth 2, an air inlet 101 is arranged at one end, far away from the hearth 2, of the furnace shell 1, an air outlet 102 is arranged at one end, far away from the air inlet 101, of the furnace shell, natural air enters the cavity in the furnace shell 1 from the air inlet 101 at one end of the furnace shell 1, heat exchange is carried out on the natural air and heat generated by fuel combustion, hot air heated by the heat exchange is discharged from the air outlet 102 of the furnace shell 1, and the hot air is supplied to equipment needing the hot air energy.

The lower part of a furnace bridge 15 of the hearth 2 is a slag settling chamber, slag materials and dust after combustion fall into the slag settling chamber from the furnace bridge 15, a lower furnace door 16 is arranged on the slag settling chamber, and the slag materials deposited in the slag settling chamber can be discharged from the lower furnace door 16. The upper part of the furnace bridge 15 of the hearth 2 is also provided with an upper furnace door 17.

As shown in fig. 2 and fig. 3, the swirling flow air generator 5 includes a generator main body 501 and at least two air guiding pipes 502, the generator main body 501 is communicated with the first air inlet pipe 3, and the air guiding pipes 502 are used for enabling air coming out of the first air inlet pipe 3 to enter the furnace 2 along a spiral track. The included angle between the air guide pipes and the horizontal plane can be 0-60 degrees, the cross sections of the air guide pipes are preferably circular, in the embodiment, the swirling flow air generator 5 comprises two air guide pipes 502, the air guide pipes 502 are arc-shaped and are positioned in the horizontal plane (namely, the included angle between the air guide pipes and the horizontal plane is 0 degree), the two air guide pipes 502 are arranged in a central symmetry manner, air with certain intensity and coming out of the first air inlet pipe 3 passes through the swirling flow air generator 5 and is discharged from the two arc-shaped air guide pipes 502 to enter the hearth 2, and arrows in fig. 3 indicate the flowing direction of the air. Because the two air guide pipes 502 which are arranged in a central symmetry manner are arc-shaped, the air coming out of the air guide pipes 502 moves along a spiral track and interacts with the inner wall of the hearth 2 to continuously rise in a spiral state to fill the whole hearth 2, so that the uniform oxygen supply to the hearth 2 is realized, the fuel is well stirred, the fuel can be fully combusted, and the coking or caking phenomenon caused by full combustion of the fuel can be effectively prevented. The swirling flow wind generator 5 has a simple structure and is convenient to use, and in order to enable the swirling flow wind to generate a better effect, a flow deflector can be arranged in the generator main body 501.

Specifically, the hearth 2 comprises a first hearth 201 and a second hearth 202, the first hearth 201 and the second hearth 202 are arranged in parallel and communicated at the top, and the first air inlet pipe 3 is communicated with the bottom of the first hearth 201. The furnace bridge 15 is arranged on the first hearth 201, fuel enters from the feeding hole 13 on the first hearth 201 and is combusted for the first time in the first hearth 201, generated gas or powder is brought into the second hearth 202 by cyclone air and is combusted again in the second hearth 202, and the fuel is combusted for multiple times by arranging the first hearth 201 and the second hearth 202, so that the fuel and generated combustible gas are combusted more fully, and the heat efficiency is improved.

In this embodiment, the air blower 4 is connected to an air box 6, the first air inlet pipe 3 is communicated with the air box 6, the air box 6 is further communicated with a second air inlet pipe 7, and the second air inlet pipe 7 is communicated with the upper portion of the first hearth 201. The blower 4 supplies air to the first air inlet pipe 3 and the second air inlet pipe 7 through the air box 6 respectively, and supplies air to different parts of the first hearth 201 respectively, so that sufficient oxygen is provided for the combustion of fuel in the hearth 2, and the fuel is more fully combusted. In order to make the fuel burn fully as much as possible, a third air inlet pipe 8 is communicated with the air box 6, and the third air inlet pipe 8 is communicated with the second hearth 202. The third air inlet pipe 8 supplies air to the second hearth 202 to provide sufficient oxygen for the fuel to be combusted again in the second hearth 202. The fuel is completely combusted by supplying oxygen for three times during the combustion of the fuel, and the maximum heat energy is generated.

The embodiment further embodies the scheme that a heat exchange chamber 9 is arranged in the furnace shell, and the heat exchange chamber 9 is communicated with the second hearth 202. More specifically, the bottom of the second hearth 202 is provided with a first ash settling chamber 10, and the bottom of the heat exchange chamber 9 is communicated with the first ash settling chamber 10. The hot gas generated by the combustion of the fuel in the first hearth 201 and the insufficiently combusted powder material enter the second hearth 202 and are combusted again, the hot gas generated finally by the combustion comes out of the second hearth 202, the ash deposition purification is carried out at the first ash deposition chamber 10, then the hot gas upwards enters the heat exchange chamber 9 from the bottom of the heat exchange chamber 9, the natural cold air entering from the air inlet 101 of the furnace shell 1 passes through the cavity between the heat exchange chamber 9 and the furnace shell 1 and fully exchanges heat with the hot gas generated by the combustion of the fuel to obtain hot air, and the hot air sequentially passes through the cavities outside the second hearth 202 and the first hearth 201 and continues to exchange heat, and finally is discharged from the air outlet 102 of the furnace shell 1. Specific heat exchange processes are shown in fig. 4 and 5, arrows in fig. 4 indicate the flow direction of hot gas generated by combustion, and arrows in fig. 5 indicate the flow direction of cold air in the furnace shell 1. The whole process has good heat exchange effect. The first dust settling chamber 10 is provided with a first cleaning port 18, which can clean the dust in the first dust settling chamber 10 periodically or irregularly.

The heat exchange chamber 9 comprises a first heat exchange chamber 901 and a second heat exchange chamber 902, the bottom of the first heat exchange chamber 901 is communicated with the second hearth 202, and the top of the first heat exchange chamber 901 is communicated with the top of the second heat exchange chamber 902. The bottom of the first heat exchange chamber 901 is communicated with the first ash settling chamber 10. First heat exchange chamber 901 and second heat exchange chamber 902 of this embodiment set up side by side, and first heat exchange chamber 901 and second heat exchange chamber 902 establish ties, have increased the stroke of steam, the steam temperature in the second heat exchange chamber 902 is lower than the steam temperature in first heat exchange chamber 901, cold wind is earlier through the outside cavity of second heat exchange chamber 902, carry out preliminary heat transfer, then carry out further heat transfer through the outside cavity of second heat exchange chamber 902 again, be favorable to cold wind and hot-blast fully to carry out the heat exchange, improve heat exchange efficiency.

Specifically, the first heat exchanging chamber 901 comprises at least one first heat dissipating pipe, the bottom of the first heat dissipating pipe is communicated with the second hearth 202, and the top of the first heat dissipating pipe is communicated with the top of the second heat exchanging chamber 902. More specifically, all the first radiating pipes are communicated with each other at the bottom and with the first deposition chamber 10.

In this embodiment, the cooling tube can be column or slice, is equipped with a plurality of cooling tubes, and all cooling tubes set up side by side, and the upper portion of all cooling tubes, lower part communicate respectively, and steam moves in the cooling tube, and air conditioning is at the outer cavity motion of cooling tube, through setting up the cooling tube, especially slice cooling tube, can effectively increase heat radiating area, improves the efficiency of heat transfer greatly.

More specifically, the second heat exchanging chamber 902 includes at least one second heat dissipating pipe, the top of the second heat dissipating pipe is communicated with the first heat exchanging chamber 901, and the bottom of the second heat dissipating pipe is communicated. The structure of the second heat exchanging chamber 902 is the same as that of the first heat radiating chamber, all the second heat radiating pipes are communicated with each other at the top and with the first heat exchanging chamber, and the second heat exchanging chamber also has higher heat exchanging efficiency.

The bottom of the second heat exchange chamber 902 is provided with a second ash settling chamber 11, the second ash settling chamber 11 is communicated with the bottom of the dust removal chamber 12, and the dust removal chamber 12 is provided with at least one layer of dust removal net.

In this embodiment, the tail gas from the second heat exchange chamber 902 continues to be subjected to ash settling purification in the second ash settling chamber 11, which is beneficial to reducing the content of solid waste gas in the discharged tail gas and protecting the environment. The second dust settling chamber 11 is provided with a second cleaning port 19, which is convenient for cleaning the dust accumulated in the second dust settling chamber 11.

The tail gas that comes out from the second ash settling chamber 11 gets into clean room 12, removes dust through the dust screen and filters, and the top of clean room 12 is equipped with the gas vent, and gas vent department can set up draught fan 20, makes the tail gas after the heat exchange discharge from this hot-blast furnace inside smoothly through the clean room. The dust removal chamber further removes solid wastes in the tail gas, so that solid impurities in the tail gas can be basically and completely removed, dust generated after combustion is prevented from being directly discharged into the environment, the environment protection is facilitated, and the problems of much dust and large smoke in the tail gas discharged by the existing hot blast stove are solved; meanwhile, the dust chamber 12 is close to the air inlet 101 of the furnace shell 1, the cooled air enters the cavity between the furnace shell 1 and the dust chamber 12 from the air inlet 101, and the tail gas in the dust chamber 12 possibly has a certain temperature, so that the cold air entering from the air inlet 101 can be preheated, the temperature of the discharged tail gas can be further reduced, and the heat energy generated by fuel combustion can be fully utilized. The hot-blast furnace that this embodiment provided adopts multistage heat transfer mode, makes heat energy utilization more abundant, and dust, smog after the burning simultaneously sink ash chamber and clean room 12 filtration through sinking many times, play good energy-conserving, environmental protection.

The hot blast stove provided by the embodiment specifically comprises the following working processes:

the feeder 14 conveys fuel from the feed inlet 13 to the first hearth 201, the fuel falls into the grate 15 at the lower part of the first hearth 201 to be combusted to generate heat, air generated by the air blower 4 is blown by the air box 6 from the first air inlet pipe 3 and is generated into cyclone air through the cyclone air generator 5, the air enters the first hearth 201 from the lower part of the grate 15 at the bottom of the first hearth 201, the cyclone air is not uniform in wind direction and is interacted with the side wall of the first hearth 201 in the first hearth 201 to be changed continuously, not only the fuel in the combustion process is turned over, but also the air in the first hearth 201 is more uniform, so that the fuel is combusted fully, and more heat is generated.

Slag and dust generated after fuel combustion fall into a slag settling chamber below the furnace bridge 15 and can be discharged from a lower furnace door 16, hot air, combustible gas and powder particle fuel generated by combustion move towards the upper part of the first furnace 201 under the driving of cyclone air, air generated by the blower 4 enters the upper part of the first furnace 201 from the second air inlet pipe 7 through the air box 6 to provide sufficient oxygen for the upper part of the first furnace 201, the combustible gas and the powder particles are combusted on the upper part of the first furnace 201 for secondary combustion to continue generating heat, the hot air, completely unburnt combustible gas and the powder particle fuel enter the second furnace 202 from the top of the first furnace 201, and the air generated by the blower 4 enters the second furnace 202 from the third air inlet pipe 8 through the air box 6 to provide sufficient oxygen for combustion in the second furnace 202.

The fuel is burnt many times, the final combustion is complete, and produce a large amount of heats, the steam that carries a large amount of heats gets into first ash settling chamber 10 from second furnace 202 bottom and deposits and tentatively detach the great dust of granule, then get into first heat transfer chamber 901 and carry out the heat transfer, and get into second heat transfer chamber 902 and carry out the heat transfer once more, gas after the heat transfer gets into second ash settling chamber 11 of second heat transfer chamber 902 bottom and carries out the ash purification of sinking for the second time, tail gas after two times deposit the dust removal gets into clean room 12 and carries out the dust removal purification, the tail gas of basically having detached solid impurity, discharge the stove outside through draught fan 20.

Meanwhile, natural cold air enters from the air inlet 101 at one end of the furnace shell 1, the moving direction of the natural cold air is opposite to the overall moving direction of hot air generated by combustion, the natural cold air firstly enters the cavity between the dust removal chamber 12 and the furnace shell 1, and a small amount of preheating can exist after heat exchange is carried out on tail gas in the dust removal chamber 12, the temperature of the tail gas is higher than that of natural cold air, therefore, the natural cold air exchanges heat with the tail gas at the dust chamber 12, thereby not only reducing the temperature of the tail gas and being beneficial to reducing the thermal pollution of the tail gas, and can preheat natural cold air, the preheated air continues to move to the other end of the furnace shell 1 and exchanges heat with hot air generated by combustion in the second heat exchange chamber 902 and the first heat exchange chamber 901 in sequence to become hot air with large heat energy, then the air passes through a cavity between the hearth 2 and the furnace shell 1 and is finally discharged from an air outlet 102 at the other end of the furnace shell 1 to supply equipment requiring hot air energy. Through multiple heat exchange, the heat exchange efficiency is high.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The hot blast stove is characterized by comprising a stove shell (1), wherein a hearth (2) is arranged in the stove shell (1), a first air inlet pipe (3) is connected to the hearth (2), an outlet is formed in the first air inlet pipe (3), the outlet is positioned in the hearth (2), a cyclone air generator (5) is arranged on the outlet, the cyclone air generator (5) is used for converting air coming out from the outlet into cyclone air, and one end, far away from the hearth (2), of the first air inlet pipe (3) is connected with an air blower (4);

the cyclone wind generator (5) comprises a generator main body (501) and at least two wind guide pipes (502), the generator main body (501) is communicated with the first air inlet pipe (3), and the wind guide pipes (502) are used for enabling wind coming out of the first air inlet pipe (3) to enter the hearth (2) along a spiral track;

a feed inlet (13) is formed in the hearth (2), fuel falls into a furnace bridge (15) at the lower part of the hearth (2) from the feed inlet (13), the first air inlet pipe (3) is connected to the hearth (2) at the lower part of the furnace bridge (15) and extends into the central part of the hearth (2), an outlet of the first air inlet pipe (3) is vertically upward, and swirl air is provided for the hearth (2) through the swirl air generator (5);

the hearth (2) comprises a first hearth (201) and a second hearth (202), the first hearth (201) and the second hearth (202) are arranged in parallel and communicated at the top, and the first air inlet pipe (3) is communicated with the bottom of the first hearth (201).

2. The hot blast stove according to claim 1, characterized in that the air outlet of the blower (4) is connected with an air box (6), the first air inlet pipe (3) is communicated with the air box (6), the air box (6) is further communicated with a second air inlet pipe (7), and the second air inlet pipe (7) is communicated with the upper part of the first hearth (201).

3. The hot blast stove according to claim 2, wherein the wind box (6) is further communicated with a third wind inlet pipe (8), and the third wind inlet pipe (8) is communicated with the second hearth (202).

4. The hot blast stove according to claim 1, characterized in that a heat exchange chamber (9) is provided in the shell (1), said heat exchange chamber (9) being in communication with the second hearth (202).

5. The hot blast stove according to claim 4, characterized in that the heat exchange chamber (9) comprises a first heat exchange chamber (901) and a second heat exchange chamber (902), the bottom of the first heat exchange chamber (901) communicating with the second hearth (202), the top of the first heat exchange chamber (901) communicating with the top of the second heat exchange chamber (902).

6. The hot blast stove according to claim 5, wherein said first heat exchange chamber (901) comprises at least one first heat pipe, the bottom of said first heat pipe is communicated with said second hearth 202, and the top of said first heat pipe is communicated with the top of said second heat exchange chamber 902.

7. The hot blast stove according to claim 5, wherein said second heat exchange chamber (902) comprises at least one second heat dissipation pipe, the top of said second heat dissipation pipe is communicated with said first heat exchange chamber (901), and the bottom of said second heat dissipation pipe is communicated.

8. The hot blast stove according to claim 5, characterized in that a second ash deposition chamber (11) is provided at the bottom of the second heat exchange chamber (902), the second ash deposition chamber (11) is communicated with the bottom of the dust removal chamber (12), and the dust removal chamber (12) is provided with at least one layer of dust removal net.