Inlet air preheating device of industrial kiln

Abstract

The utility model relates to the technical field of industrial kilns, in particular to an industrial kiln air inlet preheating device which comprises a box body and a plurality of heaters. The box body comprises an air inlet and an air outlet; the plurality of heaters comprise fixed ends and heating pipes, the fixed ends are fixed on the box body, and the heating pipes are positioned in the box body; the heating pipes are sequentially distributed in the airflow direction from the air inlet to the air outlet, and the adjacent heating pipes are arranged in a staggered mode in the direction perpendicular to the airflow direction. The preheating device is used for preheating gas entering the kiln, the phenomenon that the temperature in the hearth fluctuates to affect the uniformity of the temperature is avoided, energy waste is avoided, and meanwhile the phenomenon that a heating device in the hearth is affected by low-temperature gas and damaged is avoided. The heating pipes arranged in the box body are distributed in the airflow direction, and the adjacent heating pipes are staggered in the direction perpendicular to the airflow direction, so that each group of heating pipes can be in uniform contact with the airflow and cannot be shielded by the front heating pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial kilns, and particularly relates to an air intake preheating device for an industrial kiln. Background Art

[0002] An industrial kiln is a device made of refractory materials for calcining materials or firing products. During application, adding inert gas into the kiln can discharge the air in the kiln to prevent oxidation and pollution. At the same time, the inert gas can also play a role in heat preservation and atmosphere balance.

[0003] When introducing inert gas into the kiln, if the normal-temperature gas directly enters the furnace body without heating, it will greatly reduce the temperature of the furnace chamber, causing fluctuations in the furnace chamber temperature. After the temperature drops, the heaters in the furnace need to immediately increase the heating power, which not only affects the uniformity of the furnace chamber temperature but also causes waste of the heater power. The heaters in a high-temperature state repeatedly contact the low-temperature gas, which will also shorten the service life of the heaters and even cause damage to the heaters.

[0004] Due to the existence of the above defects, preheating devices for preheating gas have emerged continuously, but there are still problems of low heat exchange efficiency and poor preheating effect, and thus the above traditional problems cannot be effectively overcome. If the preheating effect is to be improved, it is necessary to continuously increase the length of the preheating channel, which poses a great challenge to the spatial layout design of the structure. Therefore, the utility model has developed an air intake preheating device for an industrial kiln to solve the problems existing in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an air intake preheating device for an industrial kiln to solve the problems of unstable furnace chamber temperature, energy waste, and reduced service life of equipment caused by the poor preheating effect of the gas introduced into the kiln in the prior art.

[0006] The technical solution of the utility model is: an air intake preheating device for an industrial kiln, comprising:

[0007] A box body, the box body includes an air inlet and an air outlet;

[0008] A plurality of heaters, each heater includes a fixed end and a heating tube, the fixed end is fixed on the top of the box body, and the heating tube is located inside the box body; in the air flow direction from the air inlet to the air outlet, the plurality of heating tubes are arranged in sequence, and adjacent heating tubes are staggered along a direction perpendicular to the air flow direction.

[0009] Preferably, at least part of the outer wall of the heating tube is wound with spiral fins for increasing the heat dissipation area.

[0010] Preferably, the heating tube is constructed in a W shape and includes four heating parts arranged in a straight tube shape and in parallel, and transition parts between adjacent heating parts; the fixed end is arranged at one end of the two edge heating parts far from the transition part.

[0011] Preferably, a box cover is further fixed on the top of the box body, and the fixed end of the heating tube is fixed on the box cover.

[0012] Preferably, a cavity is provided at the top of the box body, and the box cover is accommodated in the cavity; a support part extending outward is provided on the top of the box cover, and the support part is carried on the upper end surface of the box body and fixedly connected;

[0013] A plurality of mounting holes perpendicular to the end surface and penetrating through are provided in the box cover for the fixed end to penetrate through and be locked and fixed.

[0014] Preferably, both the box body and the box cover include an inner shell, an outer shell, and heat insulation materials filled between the inner shell and the outer shell; a bushing is provided at the position of the mounting hole penetrating through.

[0015] Preferably, a thermocouple for measuring the temperature inside the box body is further installed on the box cover.

[0016] Preferably, the air inlet and the air outlet are arranged at the same height;

[0017] The air inlet is used for connecting an inlet pipeline, a vortex flowmeter and an electric actuator are arranged on the inlet pipeline, and the inlet pipeline is electrically connected to the thermocouple;

[0018] The air outlet is used for connecting an outlet pipeline.

[0019] Compared with the prior art, the advantages of the present utility model are as follows:

[0020] (1) The present utility model is used for preheating the gas entering the kiln furnace, avoiding the temperature in the furnace chamber from fluctuating and affecting the temperature uniformity, avoiding energy waste, and at the same time avoiding the heating device in the furnace chamber from being damaged by the low-temperature gas.

[0021] (2) A plurality of heating tubes arranged in the box body are distributed along the air flow direction, and adjacent heating tubes are staggered in the direction perpendicular to the air flow direction, so that each group of heating tubes can uniformly contact the air flow without being blocked by the previous heating tubes.

[0022] (3) Spiral radiating fins are wound on the outer wall of the heating tube, doubling the heat dissipation area of the heating tube, greatly improving the heat exchange efficiency, and having a better preheating effect on the gas about to enter the kiln furnace.

[0023] (4) The heating tube is in a W shape, which can well compensate for the expansion deformation of the heating tube in the hot state, and avoid the possible fracture of the heating tube caused by frequent temperature rise and fall during long-term use.

[0024] (5) A detachable cover is provided on the top of the box body, and the heater is fixedly connected to the cover. Thus, all heaters can be integrally pulled out with the cover, which is convenient for the maintenance and replacement of the heaters.

[0025] (6) Both the box body and the cover include an inner shell, an outer shell and heat insulation materials, which reduce the heat loss to the outside and avoid energy waste. At the same time, the installation holes opened on the cover will expose the heat insulation materials, so bushings are provided at the installation holes. Description of the Drawings

[0026] The following further describes the present invention in conjunction with the drawings and embodiments:

[0027] Figure 1 It is the front view of an intake air preheating device for an industrial kiln according to the present invention;

[0028] Figure 2 It is the top view of an intake air preheating device for an industrial kiln according to the present invention;

[0029] Figure 3 It is the side view of an intake air preheating device for an industrial kiln according to the present invention;

[0030] Figure 4 It is the exploded view of the box body and the cover according to the present invention;

[0031] Figure 5 It is the schematic diagram of the heater according to the present invention.

[0032] Among them: 1. Box body;

[0033] 101. Inner shell, 102. Outer shell, 103. Heat insulation material, 11. Intake port, 12. Outlet port, 13. Flange, 14. Gas passage, 15. Cavity, 16. Fixed plate;

[0034] 2. Cover;

[0035] 21. Support part, 22. Installation hole, 23. Bushing;

[0036] 3. Heater;

[0037] 31. Heating tube, 311. Heating part, 312. Transition part, 313. Spiral heat dissipation fin, 32. Fixed end;

[0038] 4. Thermocouple. Detailed Embodiments

[0039] The following further elaborates on the content of the present utility model in conjunction with specific embodiments:

[0040] For ease of understanding, first, the application scenario of this application is described. When an industrial kiln is operating, an inert gas is introduced into it to remove the internal air and play a role in heat preservation and atmosphere balance. Since the temperature inside the kiln is too high, if normal-temperature gas is directly introduced, it is not conducive to the heating device inside the kiln, the temperature uniformity, and the full use of energy. Therefore, a preheating device for realizing the preheating of the inert gas needs to be provided at the air inlet end of the kiln.

[0041] As Figures 1 - 3 shown, an industrial kiln air inlet preheating device includes a box body 1 and a plurality of heaters 3.

[0042] The box body 1 includes an air inlet 11 and an air outlet 12, and has a cavity 15 at the top. A box cover 2 is accommodated in the cavity 15, and it is defined that the box cover 2 belongs to a part of the box body.

[0043] Specifically, as Figure 4 shown, the air inlet 11 and the air outlet 12 are arranged at the same height, and flanges 13 are provided at both ends. The air inlet 11 is connected to an air inlet pipeline through the flange 13, and the air outlet 12 is connected to an air outlet pipeline through the flange 13. In the actual application scenario, the positions of the air inlet 11 and the air outlet 12 are not limited. In this embodiment, it is set that the left side is the air inlet 11 and the right side is the air outlet 12.

[0044] The box cover 2 has a support portion 21 extending outward at the top. The support portion 21 is carried on the upper end surface of the box body 1 and is fixedly connected by bolts. Of course, in other embodiments, similar structures such as pins can also be used for limiting, as long as it is convenient for the box cover 2 to be disassembled. The box cover 2 has a plurality of mounting holes 22 perpendicular to the end surface and penetrating through for installing the heaters 3.

[0045] Both the box body 1 and the box cover 2 include an inner layer shell 101, an outer layer shell 102, and a heat insulation material 103 filled between the inner layer shell 101 and the outer layer shell 102 to prevent the heat inside the box body 1 from flowing to the outside and causing energy waste.

[0046] For the box body 1, the inner layer shell 101, the outer layer shell 102, and the heat insulation material 103 are distributed around and at the bottom. A fixing plate 16 is provided at the top of the box body 1, and the support portion 21 of the box cover 2 is carried on the fixing plate 16.

[0047] For the lid 2, the inner shell 101 wraps around the periphery and bottom of the heat insulation material 103, and the outer shell 102 is located on top of the heat insulation material 103; it can be understood that at this time, the periphery of the outer shell 102 is the supporting part 21 extending outwards. Due to the heat insulation material 103 provided on the lid 2, the heat insulation material 103 will be exposed after the installation hole 22 is opened on the lid 2. Therefore, in this embodiment, a bushing 23 is provided at the installation hole 22 provided through, and the bushing 23 can serve the purpose of blocking heat leakage, and at the same time, it is more convenient to insert through when installing the heater 3.

[0048] Since the three-layer structure makes the thickness of the box body 1 relatively large, a trumpet-shaped gas passage 14 is opened on the box body 1 to connect the air inlet 11 / air outlet 12 with the space inside the box body 1, and the large end of the trumpet-shaped gas passage 14 faces the inside of the box body 1; it is convenient for the gas flowing out of the air inlet 11 to be fully dispersed in the space inside the box body 1 and finally collected and flowed out by the air outlet 12.

[0049] As Figure 5 shown, the heater 3 includes a fixed end 32 and a heating tube 31. The fixed end 32 is fixed on the lid 2 on the top of the box body 1, and the heating tube 31 is located inside the box body 1.

[0050] Specifically, a spiral fin 313 is wound around at least part of the outer wall of the heating tube 31, doubling the heat dissipation area of the heating tube 31, greatly improving the heat exchange efficiency, and having a better preheating effect on the gas about to enter the kiln. As Figure 5 shown, the heating tube 31 is configured in a W shape, including four heating parts 311 arranged in a straight tube shape and in parallel, and a transition part 312 between adjacent heating parts 311. The transition part 312 is in a semi-circular arc shape; the fixed end 32 is arranged at one end of the two edge heating parts 311 away from the transition part 312, and penetrates through the installation hole 22 and is locked and fixed during installation. In this embodiment, the spiral fin 313 is arranged at the heating part 311, and only part of the spiral fin 313 is shown in the figure. The W-shaped heating tube 31 can well compensate for the expansion deformation amount of the heating tube 31 in the hot state, and avoid the possible breakage of the heating tube 31 caused by frequent temperature rise and fall during long-term use of the heating tube 31.

[0051] In the air flow direction from the air inlet 11 to the air outlet 12, the two fixed ends 32 of each heating tube 31 are distributed perpendicular to the air flow direction, and a plurality of heating tubes 31 are arranged in sequence along the air flow direction. Adjacent heating tubes 31 are arranged staggeredly perpendicular to the air flow direction. The staggered arrangement can enable each group of heating tubes 31 to uniformly contact the air flow without being blocked by the previous heating tube 31. Combining with the attached Figure 3 shown, the 8 heating parts 311 corresponding to two adjacent heating tubes 31 are all arranged staggeredly in the air flow direction, and the overlapping area is small, ensuring that the gas can fully contact the heating tube 31 to achieve heat exchange.

[0052] Obviously, since the heaters 3 are staggeredly arranged, the mounting holes 22 formed in the lid 2 during the preparation of the lid 2 must also be staggeredly distributed. In this application, by fixing all the heaters 3 on the lid 2 and detachably connecting the lid 2 to the box body 1, all the heaters 3 can be integrally withdrawn with the lid 2, which is convenient for the maintenance and replacement of the heaters 3. Of course, during the extraction and placement process, it is necessary to ensure that the lid is taken and placed vertically to avoid damage to the heating tube 31 caused by collision with the box body 1.

[0053] As a further optimization of this embodiment, as Figure 1 shown, a thermocouple 4 for measuring the temperature inside the box body 1 is also installed on the lid 2. A vortex flowmeter and an electric actuator are provided on the intake pipeline connected to the intake port 11 and are electrically connected to the thermocouple 4. During the operation of the kiln, the intake air volume can be automatically adjusted according to the temperature of the furnace body.

[0054] During the working process, the inert gas applied in the kiln first passes through the preheating device for preheating. The inert gas in the normal temperature state enters from the intake port 11, undergoes heat exchange through the heater 3, is heated up, and is discharged through the outlet port 12, and then enters the kiln. This can avoid fluctuations in the temperature inside the furnace chamber, which may affect the temperature uniformity, avoid energy waste, and at the same time avoid damage to the heating device inside the furnace chamber caused by low-temperature gas.

[0055] The above embodiments are only used to illustrate the technical concept and features of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. An industrial furnace air intake preheating device, characterized in that: include: A box body (1), the box body (1) comprising an air inlet (11) and an air outlet (12); A plurality of heaters (3), each heater (3) comprising a fixed end (32) and a heating tube (31), wherein the fixed end (32) is fixed to the top of the box (1), and the heating tube (31) is located inside the box (1); in the airflow direction from the air inlet (11) to the air outlet (12), the plurality of heating tubes (31) are distributed in sequence, and adjacent heating tubes (31) are staggered in a direction perpendicular to the airflow direction.

2. The industrial furnace air intake preheating device according to claim 1 is characterized in that: At least part of the outer wall of the heating tube (31) is wound with spiral cooling fins (313) for increasing the heat dissipation area.

3. The industrial furnace air intake preheating device according to claim 2 is characterized in that: The heating tube (31) is constructed in a W shape, comprising four straight tube-shaped and parallel heating sections (311), and a transition section (312) between adjacent heating sections (311); the fixed end (32) is arranged at one end of the two heating sections (311) at the edge, away from the transition section (312).

4. The industrial furnace air intake preheating device according to claim 1 is characterized in that: The top of the box body (1) also includes a box cover (2) which is fixedly arranged, and the fixed end (32) of the heating tube (31) is fixed on the box cover (2).

5. The industrial furnace air intake preheating device according to claim 4 is characterized in that: The top of the box body (1) has a cavity (15), and the box cover (2) is accommodated in the cavity (15); the top of the box cover (2) has a support portion (21) extending outward, and the support portion (21) is mounted on the upper end surface of the box body (1) and fixedly connected; The box cover (2) has a plurality of mounting holes (22) which are perpendicular to the end surface and penetrate through the box cover, and through which the fixed end (32) can penetrate and be locked and fixed.

6. The industrial furnace air intake preheating device according to claim 5 is characterized in that: The box body (1) and the box cover (2) both comprise an inner shell (101), an outer shell (102), and a heat insulating material (103) filled between the inner shell (101) and the outer shell (102); a bushing (23) is provided at the through-going mounting hole (22).

7. The industrial furnace air intake preheating device according to claim 4 is characterized in that: The box cover (2) is also provided with a thermocouple (4) for measuring the temperature inside the box body (1).

8. The industrial furnace air intake preheating device according to claim 7 is characterized in that: The air inlet (11) and the air outlet (12) are arranged at the same height; The air inlet (11) is used to connect to an air inlet pipeline, on which a vortex flowmeter and an electric actuator are provided, and which are electrically connected to the thermocouple (4); The air outlet (12) is used for connecting to an air outlet pipeline.

Images