Industrial hot blast stove

Abstract

The utility model discloses an industrial hot-blast stove which comprises a stove body, a stove cover, a burner and a fan, the stove body comprises an outer barrel and an inner barrel located in the outer barrel, and an air supply duct is formed between the inner barrel and the outer barrel; a flow guide structure is fixedly arranged in the air supply duct between the inner barrel and the outer barrel and is close to the outlet end of the furnace body; the draught fan is installed on the outer side of the end, close to the combustor, of the furnace body, the air supply end of the draught fan is communicated with the interior of the air supply duct, the draught fan blows air in the air supply duct towards the outlet end of the furnace body, and after passing through the flow guide structure, the air is mixed with high-temperature gas in the furnace body and then discharged out of the furnace body. The hot-blast stove can recycle heat which should be dissipated by the stove body, and heat efficiency is improved to the maximum extent. The flow guide structure is arranged in the air supply channel and does not make direct contact with high-temperature flames and flue gas combusted by the combustor, extra-high-temperature fuel gas in the hearth is not in direct contact, dependence of the flow guide structure on high-temperature-resistant materials is reduced, and the manufacturing cost is saved.

Description

Technical Field

[0001] The utility model relates to an industrial hot blast stove. Background Art

[0002] In many industrial productions, hot air is required, and the hot air is generally generated by a hot blast stove. The common hot blast stoves are coal-fired hot blast stoves, oil-fired hot blast stoves, and gas-fired hot blast stoves. Among them, the coal-fired hot blast stove has been gradually phased out due to its large pollution, and the oil-fired hot blast stove has also been gradually not used due to its high oil cost, troublesome storage, and many cokings. Relatively speaking, the gas-fired hot blast stove is being vigorously promoted and used.

[0003] The existing hot blast stoves are all composed of a furnace body equipped with a burner and a furnace cover equipped with a blower. Refractory materials are laid in the furnace chamber, and the burner at the tail of the furnace body sprays flames into the furnace chamber for combustion; the furnace cover is installed at the front end of the furnace body, and a guide vane that can make the air blown by the blower rotate is arranged in the furnace cover. After the rotating air is mixed with the high-temperature combustion gas coming out of the furnace body, it is discharged from the air outlet at the end of the furnace cover. The purpose of doing this is to control the outlet air temperature of the combustion hot blast stove at about 300°C - 700°C, not too high, to meet the production needs. Because the air pressure coming out of the furnace cover is not high, it still needs to be pressurized by a high-temperature fan before it can be sent to the required place through a pipeline.

[0004] Advantages of the existing hot blast stoves: They can all meet the production needs.

[0005] Disadvantages of the existing hot blast stoves:

[0006] 1. The furnace body loses heat, so that the combustion heat cannot be fully utilized, resulting in a reduction in thermal efficiency.

[0007] 2. The guide vane in the furnace cover needs to be made of high-temperature resistant alloy steel plate, with high cost.

[0008] 3. In order to send out the hot air temperature, generally a high-temperature fan is also required for pressurization. Summary of the Invention

[0009] Aiming at the above problems, the purpose of the utility model is to provide an industrial hot blast stove that can recycle the dissipated heat, is reliable and economical.

[0010] An industrial hot blast stove includes a furnace body, a furnace cover, a burner, and a blower. The burner is installed at the combustion end of the furnace body, and the furnace cover is installed at the outlet end of the furnace body.

[0011] The furnace body includes an outer cylinder and an inner cylinder located in the outer cylinder, and a air supply duct is formed between the inner cylinder and the outer cylinder.

[0012] A flow guiding structure is fixedly arranged in the air supply duct between the inner cylinder and the outer cylinder, and the flow guiding structure is close to the outlet end of the furnace body.

[0013] The fan is installed on the outer side of one end of the furnace body close to the burner. A communication is formed between the air supply end of the fan and the air supply duct. The fan blows the air in the air supply duct towards the outlet end of the furnace body. After passing through the flow guiding structure, it is mixed with the high-temperature gas in the furnace body and then discharged from the furnace body.

[0014] As a preferred embodiment: The air supply duct is an annular space formed between the outer peripheral wall of the inner cylinder and the inner peripheral wall of the outer cylinder, and the annular space extends along the length direction of the furnace body from one end of the furnace body to the other end.

[0015] As a preferred embodiment: The flow guiding structure includes a plurality of flow guiding plates that are spaced along the radial direction of the furnace body and distributed in the annular space. The outer ends of the flow guiding plates are fixedly arranged with the outer cylinder, the inner ends of the flow guiding plates are fixedly arranged with the inner cylinder, and the flow guiding plates are inclined in the annular space.

[0016] As a preferred embodiment: The plane where the flow guiding plates in the flow guiding structure are located forms an inclined arrangement in the same direction with respect to the axial direction of the furnace body, and the plane where the flow guiding plates are located forms an inclined arrangement in the same direction with respect to the radial direction of the furnace body.

[0017] As a preferred embodiment: On the outer side of one end of the outer cylinder close to the fan, an air supply pipe is fixedly arranged along the tangent direction of the outer cylinder. One end of the air supply pipe communicates with the air supply duct, and the other end communicates with the air supply end of the fan.

[0018] As a preferred embodiment: The furnace cover is installed at the outlet end of the furnace body through flange connection. The inner wall of the furnace cover is lined with refractory bricks to form a tapered shape that shrinks towards the outside of the furnace cover; the inner wall of the inner cylinder is lined with refractory materials. A tapered air duct is formed between the end of the inner cylinder close to the outlet end of the furnace body and the inner wall of the furnace cover, and the tapered air duct communicates with the air supply channel.

[0019] As a preferred embodiment: An outlet short pipe is fixedly arranged in the middle of the furnace cover. A thermocouple is installed on the outlet short pipe, and a flange is arranged at the outer end of the outlet short pipe.

[0020] As a preferred embodiment: Observation windows are respectively arranged at both ends of the side of the furnace body, and the observation windows communicate with the inside of the inner cylinder.

[0021] As a preferred embodiment: The fan uses a blower with adjustable air volume and air pressure.

[0022] As a preferred embodiment: The burner uses a burner with adjustable heating power.

[0023] This hot blast stove can be widely applied in fields that require hot air, such as in a dust removal system prone to condensation and in heating processes in the chemical industry. By adopting the above technical solution, a reliable and economical solution to the problems of existing hot blast stoves is obtained, aiming to achieve a breakthrough in the design and manufacturing directions of hot blast stoves. The utility model has the following technical effects:

[0024] 1. Reuse the heat that should be dissipated from the furnace body to maximize the thermal efficiency.

[0025] 2. The diversion structure is arranged in the air supply channel, not directly contacting the high-temperature flame and flue gas during the combustion of the burner, nor directly contacting the extremely high-temperature gas in the furnace chamber, reducing the dependence of the diversion structure on high-temperature resistant materials and saving the construction cost.

[0026] 3. Through the cooperation of the fan and the diversion structure, the hot air sent out by the hot blast stove has a certain air pressure and the temperature is more balanced, and it also eliminates the need to separately use a high-temperature pressurized fan for hot air transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional structural schematic diagram of the utility model;

[0028] Figure 2 is a side structural schematic diagram of the utility model;

[0029] Figure 3 is a top view structural schematic diagram of the utility model;

[0030] Figure 4 is an end structural schematic diagram of the utility model;

[0031] Figure 5 is a furnace body structural schematic diagram of the utility model;

[0032] Figure 6 is Figure 5 the schematic diagram in the A-A direction of

[0033] In the drawings, 10. Furnace body, 11. Furnace cover, 12. Burner, 13. Fan, 14. Horizontal frame, 15. Vertical support leg, 16. Support plate, 17. Burner mounting seat, 18. Outer cylinder, 19. Inner cylinder, 20. Air supply duct, 21. Deflector, 22. Air supply pipe, 23. Conical air duct, 24. Outlet short pipe, 25. Thermocouple, 26. Flange, 27. Observation window. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present utility model in conjunction with the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the described embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0035] Please refer to Figures 1-6 As shown, an industrial hot blast stove includes a furnace body 10, a furnace cover 11, a burner 12, and a blower 13. The overall furnace body 10 is placed horizontally, and the furnace body 10 is supported by a frame below. The frame includes a horizontal frame 14 and four vertical support legs 15. The horizontal frame 14 is fixedly arranged horizontally above the four vertical support legs 15. Vertically arranged support plates 16 are fixedly arranged at both ends of the horizontal frame 14. The upper surface of the support plate 16 is adapted to the shape of the outer wall of the furnace body 10, and the support plate 16 and the outer wall of the furnace body 10 are fixedly arranged by welding, so that the furnace body 10 is stably supported horizontally through the frame. The burner 12 can be a gas burner 12 or an oil burner to cooperate with combustion in the furnace body 10 to heat up the inside of the furnace body 10. The burner 12 is installed at the combustion end of the furnace body 10 through a burner mounting seat 17. The furnace cover 11 is installed at the outlet end of the furnace body 10. When the combustion end of the burner 12 is inside the furnace body 10, the generated high-temperature hot gas can be discharged from the outlet end of the furnace body 10.

[0036] The furnace body 10 includes an outer cylinder 18 and an inner cylinder 19 located in the outer cylinder 18. Both the outer cylinder 18 and the inner cylinder 19 are circular cylinders. The inner diameter of the outer cylinder 18 is greater than the outer diameter of the inner cylinder 19. Thus, when the inner cylinder 19 is placed inside the outer cylinder 18, an air supply duct 20 is formed between the inner cylinder 19 and the outer cylinder 18. Preferably, the axis of the inner cylinder 19 coincides with the axis of the outer cylinder 18, so that the air supply channel formed between the two can be more balanced.

[0037] The blower 13 is installed outside one end of the furnace body 10 close to the burner 12. The air supply end of the blower 13 is in communication with the inside of the air supply duct 20. The blower 13 blows the air in the air supply duct 20 towards the outlet end of the furnace body 10. After passing through the guiding structure, it is mixed with the high-temperature gas in the furnace body 10 and then discharged from the furnace body 10. The burner 12 generates high temperature by burning inside the inner cylinder 19, and through the heat conduction of the inner cylinder 19, a certain higher temperature can be generated in the air supply channel. The blower 13 sends air into the air supply channel, causing flow in the air supply channel, so that it is mixed with the high-temperature gas in the furnace body 10 and then discharged.

[0038] A flow guiding structure fixedly arranged in the air supply duct 20 between the inner cylinder 19 and the outer cylinder 18. The flow guiding structure is close to the outlet end of the furnace body 10 and is arranged in the air supply channel. Firstly, it can avoid direct contact with the high-temperature flue gas generated by the burner 12. Thus, the flow guiding structure does not need to be made of high-cost high-temperature resistant alloy steel plates and can be made of steel plates with slightly lower high-temperature resistance and lower cost. Secondly, the flow guiding structure can effectively support the space between the inner cylinder 19 and the outer cylinder 18, serving as a cage function between the inner cylinder 19 and the outer cylinder 18, increasing the stability between the inner cylinder 19 and the outer cylinder 18, and at the same time, the corresponding cage can be omitted. Thirdly, by generating rotational flow guiding in the air supply channel in advance through the flow guiding structure, the mixing ability of the gas discharged from the air supply channel and the high-temperature flue gas discharged from the furnace body 10 can be increased, making the temperature of the high-temperature gas discharged from the furnace body 10 more stable. Fourthly, by mixing the higher-temperature air in the air supply channel with the high-temperature flue gas in the furnace body 10, the heat loss of the discharged high-temperature flue gas can be relatively reduced.

[0039] In some embodiments, the air supply duct 20 is an annular space formed between the outer peripheral wall of the inner cylinder 19 and the inner peripheral wall of the outer cylinder 18, and the annular space extends from one end of the furnace body 10 towards the other end in the length direction of the furnace body 10; that is, the annular space basically covers the entire length of the inner cylinder 19 to make full use of the heat radiated from the inner cylinder 19.

[0040] In some embodiments, the flow guiding structure includes a plurality of flow guiding plates 21 that are spaced along the radial direction of the furnace body 10 and distributed in the annular space. The outer ends of the flow guiding plates 21 are fixedly arranged with the outer cylinder 18, and the inner ends of the flow guiding plates 21 are fixedly arranged with the inner cylinder 19. The flow guiding plates 21 are inclined in the annular space. The flow guiding plates 21 and the inner cylinder 19 and the outer cylinder 18 can be fixedly arranged by welding, so that the flow guiding plates 21 have a supporting and holding ability for the inner cylinder 19 and the outer cylinder 18.

[0041] In some embodiments, the plane where the flow guiding plates 21 in the flow guiding structure are arranged forms an inclined arrangement in the same direction with respect to the axial direction of the furnace body 10, and the plane where the flow guiding plates 21 are arranged forms an inclined arrangement in the same direction with respect to the radial direction of the furnace body 10. Through the arrangement of the flow guiding plates 21, the air in the annular space can be annularly distributed and discharged from the annular space, and through the inclined arrangement, the air discharged from the annular space can generate an outward swirl and has a certain ability to push outward.

[0042] In some embodiments, on the outer side of one end of the outer cylinder 18 close to the blower 13, an air supply duct 22 is fixedly arranged along the tangential direction of the outer cylinder 18. One end of the air supply duct 22 communicates with the air supply air duct 20, and the other end communicates with the air supply end of the blower 13. That is, the blower 13 sends air along the tangential direction of the annular space, so that the sent air can flow in the annular space in a spiral manner, better and faster increasing the temperature of the sent air. The air supply duct 22 is a square duct, which is convenient for the connection of the blower. And the connection part between the air supply duct 22 and the air supply air duct 20 can be set in a flat-mouth shape to increase the speed of the air entering the annular space and the corresponding air inlet area.

[0043] In some embodiments, the furnace cover 11 is installed at the outlet end of the furnace body 10 by flange connection. The inner wall of the furnace cover 11 is built with refractory bricks into a conical shape that tapers towards the outside of the furnace cover 11; similarly, refractory materials are built on the inner wall of the inner cylinder 19. One end of the inner cylinder 19 close to the furnace cover 11 forms a conical shape adapted to the inner wall of the furnace cover 11, so as to form a conical air duct 23 between the end of the inner cylinder 19 close to the outlet end of the furnace body 10 and the inner wall of the furnace cover 11. The conical air duct 23 communicates with the air supply channel; the arrangement of the conical air duct 23 is, firstly, to facilitate the convergence of the air in the annular space towards the outlet end of the inner cylinder 19 and mix it with the high-temperature flue gas discharged from the furnace body 10, and secondly, to further increase the flow rate and wind pressure of the air discharged from the annular space. The refractory material can be formed by piling up refractory bricks.

[0044] In some embodiments, an outlet short duct 24 is fixedly arranged in the middle of the furnace cover 11. A thermocouple 25 is installed on the outlet short duct 24 to detect the temperature of the discharged hot air. A flange 26 is arranged at the outer end of the outlet short duct 24 to facilitate the connection of the hot blast stove to the equipment.

[0045] In some embodiments, observation windows 27 are respectively arranged at both ends of the side of the furnace body 10. The observation windows 27 communicate with the inside of the inner cylinder 19 to facilitate observing the working conditions inside the hot blast stove from the outside.

[0046] In some embodiments, the blower 13 is a blower with adjustable air volume and air pressure; the burner 12 is a burner 12 with adjustable heating power; in this way, by adjusting the heating power of the burner 12 and cooperating with adjusting the air volume and air pressure of the blower, the adjustment of the hot air volume and hot air temperature can be realized within the designed index range to meet the use in more hot air occasions.

[0047] Working process of the utility model: The pressurized air blown by the blower passes through the air supply pipeline 22 and enters the air supply channel from the tangential direction, flowing rotationally towards the hot air outlet direction. During the flowing process, it absorbs the heat on the inner cylinder 19 to realize heat reuse, and then enters the conical air duct 23 after being intensively rotated and guided by the inclined deflector 21. After being mixed with the extremely high-temperature gas heated by the flame in the furnace body 10, it flows out towards the hot blast stove outlet. Due to the reason of being pushed by the conical air duct 23 with a forward direction, the finally flowing out hot air has a forward pressure. Therefore, there is no need to pressurize with a high-temperature blower and it can be directly sent to the place where hot air is needed. At the same time, the inclined deflector 21 is arranged between the inner cylinder 19 and the outer cylinder 18 and does not contact the extremely high-temperature gas in the furnace chamber, so there is no need to use heat-resistant alloy steel plates for production, and the service life is improved.

[0048] Finally, it should be noted that the above embodiments are only relatively preferred embodiments of the present utility model to illustrate the technical solutions of the present utility model, rather than limiting it, let alone limiting the patent scope of the present utility model; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present utility model; in addition, directly or indirectly applying the technical solutions of the present utility model to other related technical fields shall be equally included within the scope of the patent protection of the present utility model.

Claims

1. An industrial hot blast stove, comprising a furnace body, a furnace cover, a burner, and a blower. The burner is installed at the combustion end of the furnace body, and the furnace cover is installed at the outlet end of the furnace body. It is characterized in that The furnace body includes an outer cylinder and an inner cylinder located within the outer cylinder. A blast air duct is formed between the inner cylinder and the outer cylinder. A flow guiding structure is fixedly arranged in the blast air duct between the inner cylinder and the outer cylinder, and the flow guiding structure is close to the outlet end of the furnace body. The blower is installed on the outer side of one end of the furnace body close to the burner. The air supply end of the blower is in communication with the inside of the blast air duct. The blower blows the air in the blast air duct towards the outlet end of the furnace body. After passing through the flow guiding structure, it mixes with the high-temperature gas in the furnace body and then is discharged from the furnace body.

2. An industrial hot blast stove as claimed in claim 1, wherein The blast air duct is an annular space formed between the outer peripheral wall of the inner cylinder and the inner peripheral wall of the outer cylinder, and the annular space extends from one end of the furnace body to the other end along the length direction of the furnace body.

3. An industrial hot blast stove according to claim 1, characterized in that, The flow guiding structure includes a plurality of flow guiding plates that are spaced apart along the radial direction of the furnace body and are distributed in the annular space. The outer ends of the flow guiding plates are fixedly arranged with the outer cylinder, and the inner ends of the flow guiding plates are fixedly arranged with the inner cylinder. The flow guiding plates are inclined in the annular space.

4. An industrial hot blast stove according to claim 1, characterized in that, The plane where the flow guiding plates in the flow guiding structure are located forms an inclined arrangement in the same direction with respect to the axial direction of the furnace body, and the plane where the flow guiding plates are located forms an inclined arrangement in the same direction with respect to the radial direction of the furnace body.

5. An industrial hot blast stove according to claim 1, characterized in that, On the outer side of one end of the outer cylinder close to the blower, a blast air pipe is fixedly arranged along the tangential direction of the outer cylinder. One end of the blast air pipe is in communication with the blast air duct, and the other end is in communication with the air supply end of the blower.

6. An industrial hot blast stove according to claim 1, characterized in that, The furnace cover is installed at the outlet end of the furnace body through flange connection. The inner wall of the furnace cover is lined with refractory bricks to form a tapered shape that tapers towards the outside of the furnace cover. The inner wall of the inner cylinder is lined with refractory materials. A tapered air duct is formed between the end of the inner cylinder close to the outlet end of the furnace body and the inner wall of the furnace cover, and the tapered air duct is in communication with the blast air passage.

7. An industrial hot blast stove as claimed in claim 1, wherein, An outlet short pipe is fixedly arranged in the middle of the furnace cover. A thermocouple is installed on the outlet short pipe, and a flange is arranged at the outer end of the outlet short pipe.

8. An industrial hot blast stove according to claim 1, characterized in that, Observation windows are respectively arranged on both ends of the side of the furnace body, and the observation windows communicate with the inside of the inner cylinder.

9. An industrial hot blast stove according to claim 1, characterized in that, The blower adopts a blower with adjustable air volume and air pressure.

10. An industrial hot blast stove according to claim 1, characterized in that, The burner adopts a burner with adjustable heating power.

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