Heat exchange system for hot blast stove, hot blast stove and drying equipment

Abstract

The utility model relates to the field of hot air utilization, and discloses a heat exchange system for a hot blast stove, the hot blast stove and drying device.The heat exchange system comprises a flue gas channel, a plurality of heat exchange pipes and a plurality of reversing air guide structures, and all the heat exchange pipes are arranged in the first direction in an extending mode; the multiple heat exchange pipes are sequentially arranged at intervals in the second direction perpendicular to the first direction, and the multiple reversing air guide structures are distributed at the two ends of the multiple heat exchange pipes so as to define a circuitous extending flue gas channel together with the multiple heat exchange pipes; and the multiple air guide partition plates are sequentially arranged at intervals in the first direction, each air guide partition plate is connected with at least one part of the heat exchange pipes in a penetrating mode, and any two adjacent air guide partition plates are staggered in the second direction, so that the multiple air guide partition plates jointly define an air purification channel extending in a circuitous mode. Through the arrangement, the heat exchange efficiency and the structural compactness of the heat exchange system can be improved, and the hot air temperature is more uniform.

Description

Technical Field

[0001] The present application belongs to the technical field of hot air utilization, and specifically relates to a heat exchange system for a hot air stove, a hot air stove and a drying device. Background Art

[0002] Hot air furnaces can transfer the heat generated by combustion to air with lower temperature, thereby generating hot air for use in industrial and agricultural production. They are widely used in crop drying, material drying, greenhouse warming and other fields.

[0003] However, when the existing hot blast furnace utilizes the heat exchange structure to heat the air to form hot blast, the air heating distance is short, resulting in low heat exchange efficiency. In order to ensure the heat exchange effect, the heat exchanger is required to be larger in size to provide a larger heat exchange area. At the same time, there are differences in temperature at different positions of the heat exchange structure, and the hot blast temperature is uneven, which affects the use effect of the hot blast furnace. Utility Model Content

[0004] The purpose of the present application is to provide a heat exchange system, a hot air stove and a drying device for a hot air stove, which can improve the heat exchange efficiency and structural compactness of the heat exchange system and make the hot air temperature more uniform.

[0005] In order to achieve the above-mentioned object, the present application provides a heat exchange system for a hot blast stove, which comprises:

[0006] A flue gas passage, comprising a plurality of heat exchange tubes and a plurality of reversing air guiding structures, wherein each of the heat exchange tubes is arranged to extend along a first direction, the plurality of heat exchange tubes are sequentially arranged at intervals along a second direction perpendicular to the first direction, and the plurality of reversing air guiding structures are distributed at both ends of the plurality of heat exchange tubes to define the flue gas passage extending in a circuitous manner together with the plurality of heat exchange tubes; and

[0007] A plurality of air guide baffles are arranged in sequence along the first direction, each of the air guide baffles is penetrated by at least a portion of the heat exchange tube, and any two adjacent air guide baffles are staggered along the second direction so that the plurality of air guide baffles together define a circuitously extending clean air channel.

[0008] In some embodiments, all of the heat exchange tubes are connected to each of the air guide baffles.

[0009] In some embodiments, each of the heat exchange tubes is arranged to extend vertically, and multiple heat exchange tubes are arranged in sequence and spaced apart in the horizontal direction. At least two types of heat exchange tubes with different diameters are provided in the flue gas channel. Along the upstream and downstream directions of the flue gas channel, the heat exchange tube with a relatively large diameter is arranged upstream of the heat exchange tube with a relatively small diameter.

[0010] In some embodiments, the plurality of heat exchange tubes include a plurality of first-level heat exchange tubes and a plurality of second-level heat exchange tubes, the diameters of the first-level heat exchange tubes are the same, the diameters of the second-level heat exchange tubes are the same, and the diameter of the first-level heat exchange tube is larger than the diameter of the second-level heat exchange tube.

[0011] In some embodiments, the diameter of the first-stage heat exchange tube is not less than 100 mm; and / or the diameter of the second-stage heat exchange tube is not greater than 60 mm.

[0012] In some embodiments, the plurality of reversing air guide structures include a plurality of first air guide boxes and a plurality of second air guide boxes, the plurality of first air guide boxes are located above the plurality of heat exchange tubes and are sequentially arranged along the second direction, and the plurality of second air guide boxes are located below the plurality of heat exchange tubes and are sequentially arranged along the second direction;

[0013] Among them, the upper end of each of the heat exchange tubes is connected to one of the first air guide boxes and the lower end is connected to one of the second air guide boxes. Along the upstream and downstream directions of the flue gas channel, the channel inlet of the flue gas channel is formed in the upstreammost first air guide box and the channel outlet is formed in the downstreammost first air guide box.

[0014] The second aspect of the present application also provides a hot blast furnace, which comprises:

[0015] A furnace, used for burning fuel to generate high-temperature flue gas, and including a furnace exhaust passage;

[0016] The furnace body is provided with a furnace body clean air inlet and a furnace body clean air outlet; and

[0017] The heat exchange system for the hot blast furnace is arranged in the furnace body, the channel inlet of the clean air channel is connected to the furnace body clean air inlet and the channel outlet is connected to the furnace body clean air outlet, and the channel inlet of the smoke channel is connected to the furnace exhaust channel.

[0018] In some embodiments, the hot blast furnace further includes an air induction mechanism arranged between the channel entrance of the clean air channel and the clean air inlet of the furnace body; and / or the outer wall of the furnace chamber is provided with a heat sink for dissipating heat outward, and the heat sink is arranged close to the channel entrance of the clean air channel.

[0019] The third aspect of the present application also provides a drying device, which includes:

[0020] The hot blast stove mentioned above; and

[0021] The heat preservation room is communicated with the clean air outlet of the furnace body.

[0022] In some embodiments, the heat preservation room is communicated with the clean air inlet of the furnace body, and the heat preservation room and the hot air furnace jointly define a clean air circulation duct.

[0023] In the present invention, by providing a flue gas passage that extends in a circuitous manner in the heat exchange system of the hot blast furnace, the time that the flue gas stays in the hot blast furnace can be greatly prolonged, and by defining a clean air passage that extends in a circuitous manner and is arranged crosswise with the flue gas passage through a plurality of air guide baffles, the heat exchange path of the air can be greatly prolonged, and the wind speed can be increased to increase the convective heat transfer coefficient, thereby effectively improving the heat exchange efficiency. Since the heat exchange efficiency is improved, and at the same time, a plurality of heat exchange tubes are closely arranged and the air guide baffles and the heat exchange tubes are arranged perpendicularly to each other, the flue gas passage that extends in a circuitous manner and the clean air passage can be arranged compactly, so that the air can be heated to the desired temperature using a smaller number of heat exchange tubes, thereby reducing the overall size of the heat exchange system and saving space. Furthermore, only a single clean air passage is provided in the heat exchange system, and the air heating path is consistent, which can effectively avoid the occurrence of uneven hot air temperature.

[0024] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0026] Figure 1 is a schematic diagram of a hot blast furnace in a specific embodiment of the present application, wherein the solid arrows represent the direction of flue gas flow and the dotted arrows represent the direction of hot air (i.e., clean air);

[0027] Figure 2 This is a schematic diagram of a drying device in a specific embodiment of the present application, wherein the dotted arrow indicates the flow direction of hot air (ie, clean air).

[0028] Description of Reference Numerals

[0029] 1 Furnace body 2 Furnace body clean air inlet

[0030] 3 Flue gas channel outlet 4 Secondary heat exchange tube

[0031] 5 air guide baffle 6 furnace clean air outlet

[0032] 7 Second air guide box 8 First air guide box

[0033] 9 air induction mechanism 10 heat sink

[0034] 11 Furnace 12 First-stage heat exchange tube

[0035] 13 Storage and feeding mechanism DETAILED DESCRIPTION

[0036] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0037] Reference Figure 1 The first exemplary embodiment of the present application provides a heat exchange system for a hot blast stove, comprising:

[0038] The flue gas channel comprises a plurality of heat exchange tubes and a plurality of reversing air guide structures, each of the heat exchange tubes is arranged to extend along a first direction, the plurality of heat exchange tubes are sequentially arranged in a second direction perpendicular to the first direction, and the plurality of reversing air guide structures are distributed at both ends of the plurality of heat exchange tubes to define a flue gas channel extending in a circuitous manner together with the plurality of heat exchange tubes (refer to Figure 1 The solid arrows in the figure indicate the direction of flue gas flow); and

[0039] A plurality of air guide baffles 5 are arranged in sequence along the first direction, each of which is connected with at least a portion of the heat exchange tube, and any two adjacent air guide baffles 5 are staggered along the second direction, so that the plurality of air guide baffles 5 together define a circuitous clean air channel (see Figure 1 The dotted arrows in the figure indicate the direction of hot air (i.e., clean air) flow).

[0040] In the heat exchange system of the hot blast furnace, by setting a flue gas passage that extends in a circuitous manner, the time that the flue gas stays in the hot blast furnace can be greatly prolonged, and by defining a clean air passage that extends in a circuitous manner and is arranged crosswise with the flue gas passage through a plurality of air guide baffles 5, the heat exchange distance of the air (i.e., clean air) can be greatly prolonged, and the wind speed can be increased to increase the convective heat transfer coefficient, thereby effectively improving the heat exchange efficiency. Since the heat exchange efficiency is improved, at the same time, a plurality of heat exchange tubes are closely arranged and the air guide baffles 5 and the heat exchange tubes are arranged perpendicular to each other, the flue gas passage that extends in a circuitous manner and the clean air passage can be arranged compactly, so that the air can be heated to the desired temperature using a smaller number of heat exchange tubes, thereby reducing the overall size of the heat exchange system and saving space. Furthermore, only a single clean air passage is provided in the heat exchange system, and the air heating path is consistent, which can effectively avoid the occurrence of uneven hot air temperature.

[0041] In some embodiments, reference Figure 1 All the heat exchange tubes are connected to each air guide baffle 5. Such an arrangement can ensure that the clean air in the clean air channel passes through all the heat exchange tubes before flowing to each channel turning position, that is, the clean air can exchange heat with all the heat exchange tubes multiple times during the process of passing through the entire clean air channel, thereby further improving the heat exchange effect.

[0042] In some embodiments, each heat exchange tube is arranged to extend vertically, and multiple heat exchange tubes are arranged in sequence and spaced apart in the transverse direction. At least two heat exchange tubes with different tube diameters are provided in the flue gas channel, and along the upstream and downstream directions of the flue gas channel, the heat exchange tube with a relatively large tube diameter is arranged upstream of the heat exchange tube with a relatively small tube diameter.

[0043] It should be noted that the flue gas in the flue gas channel comes from the furnace. Since the flue gas just discharged from the furnace contains a high content of particles, it is easy for the particles to adhere to the inner wall of the heat exchange tube, affecting the heat exchange effect and posing a risk of clogging the pipe. Therefore, in this embodiment, a heat exchange tube with a relatively large diameter is used in the relatively upstream area of ​​the flue gas channel, which can facilitate the sedimentation of particles and the cleaning of the pipe, and reduce the risk of particle adhesion and clogging the pipe. In contrast, a heat exchange tube with a relatively small diameter can be used in the relatively downstream area of ​​the flue gas channel, and a larger number of small-diameter heat exchange tubes can be arranged in the same space, which can increase the heat exchange area between the clean air and the heat exchange tube and improve the heat exchange effect.

[0044] For example, refer to Figure 1 The multiple heat exchange tubes include multiple primary heat exchange tubes 12 and multiple secondary heat exchange tubes 4. The diameters of the primary heat exchange tubes 12 are the same, the diameters of the secondary heat exchange tubes 4 are the same, and the diameters of the primary heat exchange tubes 12 are larger than the diameters of the secondary heat exchange tubes 4. In combination with the above, the multiple primary heat exchange tubes 12 should be arranged upstream of the multiple secondary heat exchange tubes 4.

[0045] When the flue gas passes through the plurality of primary heat exchange tubes 12, since the diameter of the primary heat exchange tubes 12 is relatively large, it is convenient for the particles in the flue gas to settle, and a large number of particles are prevented from entering the secondary heat exchange tubes 4. The plurality of secondary heat exchange tubes 4 have relatively small diameters and are relatively large in number, which can effectively increase the heat exchange area between the clean air and the heat exchange tube group, and improve the heat exchange effect.

[0046] Furthermore, in combination with actual application conditions, the diameter of the first-stage heat exchange tube 12 may be set to be no less than 100 mm; and / or the diameter of the second-stage heat exchange tube 4 may be set to be no more than 60 mm.

[0047] In some embodiments, each heat exchange tube is arranged to extend vertically, and multiple heat exchange tubes are arranged in sequence and spaced apart in the horizontal direction. Figure 1 , the multiple reversing air guide structures include multiple first air guide boxes 8 and multiple second air guide boxes 7, the multiple first air guide boxes 8 are located above the multiple heat exchange tubes and are arranged in sequence along the second direction, and the multiple second air guide boxes 7 are located below the multiple heat exchange tubes and are arranged in sequence along the second direction. Among them, the upper end of each heat exchange tube is connected to one of the first air guide boxes 8 and the lower end is connected to one of the second air guide boxes 7. Along the upstream and downstream directions of the smoke channel, the channel inlet of the smoke channel is formed in the first air guide box 8 at the most upstream and the channel outlet (i.e., the smoke channel outlet 3) is formed in the first air guide box 8 at the most downstream.

[0048] Reference Figure 1 , the solid arrow indicates the direction of flue gas flow. After the flue gas is discharged from the furnace, it first enters the flue gas channel from the flue gas channel entrance in the most upstream first air guide box 8, and then enters the most upstream second air guide box 7 through the heat exchange tube, and realizes particle sedimentation and flue gas turning in the second air guide box 7. After turning, the flue gas enters the next first air guide box 8 through the heat exchange tube. And so on, until the flue gas enters the most downstream first air guide box 8, it can be discharged from the heat exchange system from the flue gas channel outlet 3 of the first air guide box 8.

[0049] In the above process, the second air guide box 7 has the functions of guiding the smoke to turn and collecting the settled smoke particles, and has a simple and reliable structure.

[0050] It should be noted that the reversing air guide structure is not limited to the form of an air guide box. For example, the reversing air guide structure can also use a bent pipe, and connecting two adjacent heat exchange tubes through the bent pipe can also guide the flue gas to turn.

[0051] Continue to refer to Figure 1 The second exemplary embodiment of the present application further provides a hot blast stove, which includes:

[0052] The furnace 11 is used for burning fuel (generally supplied through a storage and feeding mechanism 13) to generate high-temperature flue gas, and includes a furnace exhaust passage;

[0053] The furnace body 1 is provided with a furnace body clean air inlet 2 and a furnace body clean air outlet 6; and

[0054] The above-mentioned heat exchange system is arranged in the furnace body 1. The channel inlet of the clean air channel of the heat exchange system is connected to the furnace body clean air inlet 2 and the channel outlet is connected to the furnace body clean air outlet 6. The channel inlet of the smoke channel of the heat exchange system is connected to the furnace smoke exhaust channel.

[0055] Obviously, the hot blast furnace of the present application has all the technical effects brought by the above-mentioned heat exchange system, which will not be repeated here.

[0056] In some embodiments, the hot air furnace also includes an air induction mechanism 9 arranged between the channel entrance of the clean air channel and the clean air inlet 2 of the furnace body. When the air induction mechanism 9 is working, the air outside the hot air furnace can be introduced into the clean air inlet 2 of the furnace body, and then the air enters the heat exchange system through the channel entrance of the clean air channel for heat exchange to generate hot air. Finally, the hot air can be discharged from the clean air outlet 6 of the furnace body for different uses such as drying.

[0057] In some embodiments, the outer wall of the furnace 11 is provided with a heat sink 10 for dissipating heat outwards, and the heat sink 10 is arranged near the channel entrance of the clean air channel. In this way, not only can the heat dissipation of the furnace 11 be enhanced, but the heat dissipation heat can also be used to preheat the air before it flows into the heat exchange system, thereby improving the heat dissipation efficiency of the furnace and the heat exchange efficiency of the air.

[0058] Reference Figure 2 The third exemplary embodiment of the present application further provides a drying device, which includes:

[0059] The hot blast stove mentioned above; and

[0060] The heat preservation room is communicated with the clean air outlet 6 of the furnace body.

[0061] In some embodiments, the heat preservation room is connected to the clean air inlet 2 of the furnace body, and the heat preservation room and the hot air furnace jointly define a clean air circulation duct.

[0062] The following is an example of an optional specific working process of the above drying equipment:

[0063] When the drying equipment is working, after the drying is ready, the material storage and feeding mechanism 13 feeds biomass particles (other types of fuels are also acceptable) into the furnace 11 and ignites them. After the particles burn, they heat the furnace 11, and at the same time, high-temperature flue gas is generated in the furnace 11, and then the flue gas enters the flue gas channel of the heat exchange system that extends in a circuitous manner. At the same time, the draft mechanism 9 works to introduce the air outside the hot blast furnace into the circuitous and extended clean air channel, so that the air exchanges heat with multiple heat exchange tubes to generate hot air. Then the hot air flows into the insulation room through the furnace body clean air outlet 6 for drying, and the air in the insulation room (including the waste hot air that has been preheated) can enter the hot blast furnace through the furnace body clean air inlet 2, thereby realizing the recycling of clean air, thereby improving energy utilization and saving costs.

[0064] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood 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 of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A heat exchange system for a hot blast stove, characterized in that: include: A flue gas channel, comprising a plurality of heat exchange tubes and a plurality of reversing air guiding structures, wherein each of the heat exchange tubes is arranged to extend along a first direction, and the plurality of heat exchange tubes are sequentially arranged at intervals along a second direction perpendicular to the first direction, and the plurality of reversing air guiding structures are distributed at both ends of the plurality of heat exchange tubes to define the flue gas channel extending in a circuitous manner together with the plurality of heat exchange tubes; and A plurality of air guide baffles (5) are arranged in sequence and at intervals along the first direction, each of the air guide baffles (5) is penetrated by at least a portion of the heat exchange tube, and any two adjacent air guide baffles (5) are staggered with each other along the second direction, so that the plurality of air guide baffles (5) together define a circuitously extending clean air channel.

2. The heat exchange system for a hot blast stove according to claim 1, characterized in that: All the heat exchange tubes are connected through each of the air guide baffles (5).

3. The heat exchange system for a hot blast stove according to claim 1, characterized in that: Each of the heat exchange tubes is arranged to extend vertically, and multiple heat exchange tubes are arranged in sequence and spaced apart in the horizontal direction. At least two types of heat exchange tubes with different diameters are provided in the flue gas channel. Along the upstream and downstream directions of the flue gas channel, the heat exchange tube with a relatively large diameter is arranged upstream of the heat exchange tube with a relatively small diameter.

4. The heat exchange system for a hot blast stove according to claim 3, characterized in that: The plurality of heat exchange tubes include a plurality of first-level heat exchange tubes (12) and a plurality of second-level heat exchange tubes (4); the diameters of the first-level heat exchange tubes (12) are the same, the diameters of the second-level heat exchange tubes (4) are the same, and the diameter of the first-level heat exchange tubes (12) is greater than the diameter of the second-level heat exchange tubes (4).

5. The heat exchange system for a hot blast stove according to claim 4, characterized in that: The diameter of the first-stage heat exchange tube (12) is not less than 100 mm; and / or the diameter of the second-stage heat exchange tube (4) is not greater than 60 mm.

6. The heat exchange system for a hot blast stove according to claim 3, characterized in that: The plurality of reversing air guide structures comprise a plurality of first air guide boxes (8) and a plurality of second air guide boxes (7), the plurality of first air guide boxes (8) being located above the plurality of heat exchange tubes and arranged in sequence along the second direction, and the plurality of second air guide boxes (7) being located below the plurality of heat exchange tubes and arranged in sequence along the second direction; Wherein, the upper end of each of the heat exchange tubes is connected to one of the first air guide boxes (8) and the lower end is connected to one of the second air guide boxes (7); along the upstream and downstream directions of the flue gas channel, the channel inlet of the flue gas channel is formed in the first air guide box (8) at the most upstream and the channel outlet is formed in the first air guide box (8) at the most downstream.

7. Hot blast stove, characterized in that: include: A furnace (11) for burning fuel to generate high-temperature flue gas, and comprising a furnace flue gas exhaust passage; The furnace body (1) is provided with a furnace body clean air inlet (2) and a furnace body clean air outlet (6); and The heat exchange system for a hot blast furnace according to any one of claims 1 to 6 is arranged in the furnace body (1), the channel inlet of the clean air channel is connected to the furnace body clean air inlet (2) and the channel outlet is connected to the furnace body clean air outlet (6), and the channel inlet of the flue gas channel is connected to the furnace exhaust channel.

8. The hot blast stove according to claim 7, characterized in that: The hot blast furnace further comprises an air induction mechanism (9) arranged between the channel entrance of the clean air channel and the clean air inlet (2) of the furnace body; and / or the outer wall of the furnace chamber (11) is provided with a heat sink (10) for dissipating heat outward, and the heat sink (10) is arranged close to the channel entrance of the clean air channel.

9. Drying equipment, characterized in that, include: The hot blast stove according to claim 7 or 8; and The heat preservation room is connected to the clean air outlet (6) of the furnace body.

10. The drying device according to claim 9, characterized in that: The heat preservation room is in communication with the clean air inlet (2) of the furnace body, and the heat preservation room and the hot air furnace jointly define a clean air circulation duct.

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