Tunnel kiln waste heat heating combustion-supporting air system

Abstract

The utility model discloses a tunnel kiln waste heat heating combustion-supporting air system, which relates to the technical field of tunnel kiln waste heat utilization and comprises a tunnel kiln and a heat extraction fan connected with the tunnel kiln through a heat extraction pipeline. The combustion-supporting fan is connected with the tunnel kiln through a combustion-supporting air pipeline; the heat extraction pipeline is in heat exchange connection with the combustion-supporting air pipeline through a middle heat exchange device; the middle heat exchange device comprises a heat exchanger arranged on the heat extraction pipeline, and a first heat exchange medium pipeline and a second heat exchange medium pipeline which are connected with the heat exchanger and the combustion-supporting air pipeline. According to the utility model, the middle heat exchange device is connected with the combustion-supporting air pipeline and the heat extraction pipeline, and the combustion-supporting air input by the combustion-supporting fan can exchange heat with the waste heat air extracted by the heat extraction fan in the heat exchanger before entering the tunnel kiln, so that the combustion-supporting air with lower temperature can be heated by utilizing the waste heat with higher temperature; and extra heat is not required to be consumed for heating, so that energy consumption is reduced, and certain economic benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel kiln waste heat utilization, and specifically to a tunnel kiln waste heat heating combustion-supporting air system. Background Art

[0002] Tunnel kiln is a modern continuous firing thermal equipment, widely used in the roasting production of ceramic products, and also used in metallurgical industries such as abrasives. In traditional sanitary ceramic factories, gas-fired tunnel kilns usually use air as the combustion-supporting gas, which is mixed with combustible gas when firing products. After ignition, flames are continuously ejected into the kiln. The temperature of the air is consistent with the ambient temperature of the kiln, usually between 20-50°C. When firing sanitary ceramic products, the flame temperature usually needs to be above 1100°C. Therefore, when using normal temperature air as the combustion-supporting air, part of the gas heat will be used to heat the air, resulting in energy waste.

[0003] Therefore, how to reduce the additional energy consumption when heating the combustion-supporting air has become one of the technical problems that need to be urgently solved in the field of combustion-supporting technology. Utility Model Content

[0004] In order to reduce the additional energy consumption when heating the combustion-supporting air, the utility model provides the following technical solutions:

[0005] The utility model provides a system for heating combustion-supporting air with waste heat of a tunnel kiln, comprising a tunnel kiln and a heat extraction fan connected to the tunnel kiln through a heat extraction pipeline; and

[0006] A combustion-supporting fan connected to the tunnel kiln through a combustion-supporting air duct;

[0007] The heat extraction pipeline and the combustion-supporting air pipeline are connected to each other through an intermediate heat exchange device to achieve heat exchange;

[0008] The intermediate heat exchange device includes a heat exchanger arranged on the heat extraction pipeline and a first heat exchange medium pipeline and a second heat exchange medium pipeline connecting the heat exchanger and the combustion-supporting air pipeline.

[0009] Furthermore, a first pipe opening and a second pipe opening are horizontally opened in the middle of the combustion-supporting air duct, the first pipe opening is connected to the first port of the first heat exchange channel of the heat exchanger through the first heat exchange medium pipe, and the second pipe opening is connected to the second port of the first heat exchange channel of the heat exchanger through the second heat exchange medium pipe.

[0010] Furthermore, the first pipe opening is located below the second pipe opening.

[0011] Furthermore, the heat exchange medium of the first heat exchange medium pipeline is combustion-supporting cold air, and the heat exchange medium of the second heat exchange medium pipeline is combustion-supporting hot air.

[0012] Furthermore, it also includes a heat extraction bypass pipe arranged between the heat exchanger and the heat extraction blower, one end of the heat extraction pipe is connected to the input end of the heat extraction blower, and the other end is connected to the second port of the second heat exchange channel of the heat exchanger, one end of the heat extraction bypass pipe is connected to the first port of the second heat exchange channel of the heat exchanger, and the other end is connected to the input end of the heat extraction blower.

[0013] Furthermore, guide plates and fin tubes are provided on the first port of the first heat exchange channel, the second port of the first heat exchange channel, the first port of the second heat exchange channel, and the second port of the second heat exchange channel.

[0014] Furthermore, outer walls of the heat extraction pipeline, the combustion-supporting air pipeline, the first heat exchange medium pipeline, the second heat exchange medium pipeline and the heat extraction bypass pipeline are all provided with a thermal insulation layer.

[0015] Furthermore, each pipeline is provided with a plurality of regulating devices.

[0016] Furthermore, the regulating device is a gate valve.

[0017] Furthermore, it also includes a filter arranged on the heat extraction pipe between the heat exchanger and the tunnel kiln.

[0018] The beneficial effects of the utility model compared with the prior art are:

[0019] The utility model connects the combustion-supporting air duct and the heat extraction duct by arranging an intermediate heat exchange device. The combustion-supporting air input by the combustion-supporting fan can be heat-exchanged with the waste heat air extracted by the heat extraction fan in the heat exchanger before entering the tunnel kiln. The combustion-supporting air with a lower temperature can be heated by utilizing the waste heat with a higher temperature without consuming additional heat for heating, thereby saving energy consumption and having certain economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a system for heating combustion-supporting air with waste heat from a tunnel kiln provided in an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the structure of a heat exchanger provided in an embodiment of the utility model;

[0023] Among them: 1-tunnel kiln, 2-extraction fan, 3-heat exchanger, 301-first port of the first heat exchange channel, 302-second port of the first heat exchange channel, 303-first port of the second heat exchange channel, 304-second port of the second heat exchange channel, 305-guide plate, 306-fin tube, 4-combustion-supporting fan, 5-heat extraction pipe, 6-combustion-supporting air pipe, 7-first heat exchange medium pipe, 8-second heat exchange medium pipe, 9-heat extraction bypass pipe, 10-adjusting device, 11-filter. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0025] In the description of the present utility model, it should be noted that the terminology nouns in the various embodiments, such as words indicating directions such as "upper", "lower", "front", "back", "left", "right", etc., are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the referred elements and devices must be operated according to the specific directions and specified operations and methods and structures in the specification. Such directional nouns do not constitute limitations on the present utility model.

[0026] like Figure 1 to Figure 2 As shown, an embodiment of the present application discloses a system for heating combustion-supporting air with waste heat from a tunnel kiln, comprising a tunnel kiln 1, and also comprising a heat extraction fan 2 connected to the tunnel kiln 1 via a heat extraction pipe 5; and a combustion-supporting fan 4 connected to the tunnel kiln 1 via a combustion-supporting air pipe 6; the heat extraction pipe 5 and the combustion-supporting air pipe 6 are connected to each other for heat exchange via an intermediate heat exchange device: the intermediate heat exchange device comprises a heat exchanger 3 arranged on the heat extraction pipe 5, and a first heat exchange medium pipe 7 and a second heat exchange medium pipe 8 connecting the heat exchanger 3 and the combustion-supporting air pipe 6.

[0027] In the embodiment of the present application, an intermediate heat exchange device is provided to connect the combustion-supporting air duct 6 and the heat extraction duct 5. The combustion-supporting air input by the combustion-supporting fan 4 can first be heat-exchanged with the waste heat air extracted by the heat extraction fan 2 in the heat exchanger 3 before entering the tunnel kiln 1. This allows the combustion-supporting air with a lower temperature to be heated by the waste heat with a higher temperature, without consuming additional heat for heating, thereby saving energy consumption and having certain economic benefits.

[0028] Specifically, Figure 1 As shown, a first pipe opening and a second pipe opening are horizontally opened in the middle of the combustion-supporting air duct 6 in the embodiment of the present application. The first pipe opening is connected to the first port 301 of the first heat exchange channel of the heat exchanger 3 through the first heat exchange medium pipe 7, and the second pipe opening is connected to the second port 302 of the first heat exchange channel of the heat exchanger 3 through the second heat exchange medium pipe 8.

[0029] The first heat exchange channel is the path through which the combustion-supporting air flows inside the heat exchanger 3. The first port 301 of the first heat exchange channel is the combustion-supporting air inlet, and the second port 302 of the first heat exchange channel is the combustion-supporting air outlet. The combustion-supporting air input by the combustion-supporting fan 4 first enters the first heat exchange medium pipeline 7 from the first pipeline port, reaches the first port 301 of the first heat exchange channel, performs heat exchange inside the heat exchanger 3, and then comes out from the second port 302 of the first heat exchange channel, passes through the second heat exchange medium pipeline 8, and reaches the second pipeline port.

[0030] The two pipe openings are connected to the two ports of the first heat exchange channel of the heat exchanger 3 through two heat exchange medium pipes, so that the heat exchange medium entering the heat exchanger 3 and the heat exchange medium coming out of the heat exchanger 3 can flow through different paths respectively, thereby ensuring that the heat exchange media before and after the heat exchange will not affect each other, thereby ensuring the heat exchange efficiency.

[0031] Specifically, Figure 1 As shown, the first pipe opening in the embodiment of the present application is located at the lower part of the second pipe opening, the heat exchange medium of the first heat exchange medium pipe 7 is combustion-supporting cold air, and the heat exchange medium of the second heat exchange medium pipe 8 is combustion-supporting hot air.

[0032] When the combustion-supporting air is heated, it will expand, increase in volume, decrease in density and become lighter, so the combustion-supporting hot air will rise, while the combustion-supporting cold air remains unchanged. Therefore, the upper and lower position designs of the first pipe opening and the second pipe opening can distinguish the two heat exchange medium paths, ensuring that the combustion-supporting cold air is at the bottom and the combustion-supporting hot air is at the top, and the two do not affect each other.

[0033] Specifically, Figure 1As shown, the embodiment of the present application also includes a heat extraction bypass pipe 9 arranged between the heat exchanger 3 and the heat extraction blower 2, one end of the heat extraction pipe 5 is connected to the input end of the heat extraction blower 2, and the other end is connected to the second port 304 of the second heat exchange channel of the heat exchanger 3, one end of the heat extraction bypass pipe 9 is connected to the first port 303 of the second heat exchange channel of the heat exchanger 3, and the other end is connected to the input end of the heat extraction blower 2.

[0034] The second heat exchange channel is the path through which the waste heat air flows inside the heat exchanger 3. The first port 303 of the second heat exchange channel is the waste heat air inlet, and the second port 304 of the second heat exchange channel is the waste heat air outlet. The waste heat air extracted by the heat extraction fan 2 first passes through the heat extraction pipe 5 connected to the tunnel kiln 1 to reach the first port 303 of the second heat exchange channel, and after heat exchange inside the heat exchanger 3, it comes out from the second port 304 of the second heat exchange channel, passes through the heat extraction pipe 5 to reach the input end of the heat extraction fan 2, and is then extracted by the heat extraction fan 2 to complete the heat extraction process.

[0035] When the tunnel kiln 1 completes product calcination and there is no need to use waste heat to heat the combustion-supporting air, the heat extraction bypass pipe 9 can replace the original heat extraction pipe 5 and the heat exchanger 3, and directly extract heat through the heat extraction bypass pipe 9, thereby simplifying system operation, reducing the frequency of use of the heat extraction pipe 5 and the heat exchanger 3, extending their service life, and reducing maintenance costs.

[0036] Specifically, Figure 2 As described above, guide plates 305 and fin tubes 306 are disposed on the first port 301 of the first heat exchange channel, the second port 302 of the first heat exchange channel, the first port 303 of the second heat exchange channel, and the second port 304 of the second heat exchange channel in the embodiment.

[0037] The guide plates 305 and finned tubes 306 used on each port can increase the heat exchange area and improve the heat exchange efficiency. The embodiment of the present application does not specifically limit the material of the guide plates 305 and the finned tubes 306. Preferably, the guide plates 305 and the finned tubes 306 are made of stainless steel, so that the heat exchanger 3 will not produce rust during the heat exchange process and spray it onto the product with the combustion-supporting hot air, thereby avoiding rust spots on the fired product.

[0038] Specifically, the outer walls of the heat extraction pipe 5, the combustion-supporting air pipe 6, the first heat exchange medium pipe 7, the second heat exchange medium pipe 8 and the heat extraction bypass pipe 9 in the embodiment of the present application are all provided with an insulation layer.

[0039] The entire outer wall of the pipeline is wrapped with an insulation layer, which can effectively isolate the high-temperature surface of the outer wall of the pipeline, reduce the heat risk of personnel contact, reduce the risk of scalding for workers and operators, improve work safety, and effectively reduce heat loss on the outer wall surface of the pipeline, prevent heat from spreading to the surrounding environment, thereby reducing energy consumption and operating costs.

[0040] Specifically, Figure 1 As shown, each pipeline in the embodiment of the present application is provided with a plurality of regulating devices 10. The embodiment of the present application does not specifically limit the type of regulating device 10. Preferably, the regulating device 10 is a gate valve.

[0041] The gate valve can control the flow of the heat exchange medium by adjusting the position of the gate, thereby achieving precise regulation and control of the pipeline flow, and the gate valve can be quickly closed or opened, so it is very effective when the flow of heat exchange medium needs to be quickly cut off, such as in an emergency or during maintenance.

[0042] Specifically, Figure 1 As shown, the embodiment of the present application also includes a filter 11 arranged on the heat extraction pipe 5 between the heat exchanger 3 and the tunnel kiln 1.

[0043] The filter 11 can filter impurities such as sediment and dust mixed in the waste heat air to prevent clogging in the heat exchanger 3, which helps to extend the service life of the heat exchanger 3. The embodiment of the present application does not specifically limit the type of the filter 11. Preferably, the filter 11 can be a coarse filter for capturing larger solid particles and suspended matter in the steam; it can also be a fine filter for removing smaller particles and suspended matter in the steam, such as fine sediments, particles and particles; it can also be an activated carbon filter to adsorb and remove organic matter and certain gas impurities in the steam to purify the steam.

[0044] The specific workflow of the embodiment of the present application is as follows:

[0045] The exhaust fan 2 extracts the waste heat air generated by sintering in the tunnel kiln 1 and enters the heat exchanger 3. After passing through the fin tube 306 of the heat exchanger 3, the waste heat air enters the exhaust fan 2 and is then discharged to the outside. The combustion-supporting fan 4 draws air into the heat exchanger 3, and after circulating outside the fin tube 306, it exchanges heat with the waste heat air in the fin tube 306, thereby raising the initial temperature of the combustion-supporting air from 20-50°C to above 160°C, and then enters the burners on both sides of the tunnel kiln 1 for use.

[0046] It can be seen that in a tunnel kiln waste heat heating combustion-supporting air system of an embodiment of the utility model, an intermediate heat exchange device is provided to connect the combustion-supporting air duct 6 and the heat extraction duct 5. Before the combustion-supporting air input by the combustion-supporting fan 4 enters the tunnel kiln 1, it can first undergo heat exchange with the waste heat air extracted by the heat extraction fan 2 in the heat exchanger 3, so that the combustion-supporting air with a lower temperature can be heated by utilizing the waste heat with a higher temperature, without consuming additional heat for heating, thereby saving energy consumption and having certain economic benefits.

[0047] It should be noted that, 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 the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0048] The utility model uses specific examples to illustrate the principle and implementation of the utility model. The above is only the preferred implementation of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made to it without departing from the principle and spirit of the utility model shall be included in the protection scope of the utility model.

Claims

1. A system for heating combustion-supporting air using waste heat from a tunnel kiln, comprising a tunnel kiln (1), characterized in that: It also includes a heat extraction fan (2) connected to the tunnel kiln (1) via a heat extraction pipe (5); and A combustion-supporting fan (4) connected to the tunnel kiln (1) via a combustion-supporting air duct (6); The heat extraction pipe (5) and the combustion-supporting air pipe (6) are connected by heat exchange via an intermediate heat exchange device; The intermediate heat exchange device comprises a heat exchanger (3) arranged on the heat extraction pipeline (5) and a first heat exchange medium pipeline (7) and a second heat exchange medium pipeline (8) connecting the heat exchanger (3) and the combustion-supporting air pipeline (6).

2. The system for heating combustion-supporting air with waste heat from a tunnel kiln according to claim 1 is characterized in that: A first pipe opening and a second pipe opening are horizontally opened in the middle of the combustion-supporting air pipe (6); the first pipe opening is connected to the first port (301) of the first heat exchange channel of the heat exchanger (3) via the first heat exchange medium pipe (7); and the second pipe opening is connected to the second port (302) of the first heat exchange channel of the heat exchanger (3) via the second heat exchange medium pipe (8).

3. The system for heating combustion-supporting air with waste heat from a tunnel kiln according to claim 2 is characterized in that: The first pipe opening is located below the second pipe opening.

4. The system for heating combustion-supporting air with waste heat from a tunnel kiln according to claim 1 is characterized in that: The heat exchange medium of the first heat exchange medium pipeline (7) is combustion-supporting cold air, and the heat exchange medium of the second heat exchange medium pipeline (8) is combustion-supporting hot air.

5. The system for heating combustion-supporting air with waste heat from a tunnel kiln according to claim 2 is characterized in that: It also includes a heat extraction bypass pipe (9) arranged between the heat exchanger (3) and the heat extraction fan (2), one end of the heat extraction pipe (5) is connected to the input end of the heat extraction fan (2), and the other end is connected to the second port (304) of the second heat exchange channel of the heat exchanger (3); one end of the heat extraction bypass pipe (9) is connected to the first port (303) of the second heat exchange channel of the heat exchanger (3), and the other end is connected to the input end of the heat extraction fan (2).

6. The system for heating combustion-supporting air with waste heat from a tunnel kiln according to claim 5 is characterized in that: A guide plate (305) and a fin tube (306) are provided on the first port (301) of the first heat exchange channel, the second port (302) of the first heat exchange channel, the first port (303) of the second heat exchange channel, and the second port (304) of the second heat exchange channel.

7. The system for heating combustion-supporting air with waste heat from a tunnel kiln according to claim 5 is characterized in that: The outer walls of the heat extraction pipeline (5), the combustion-supporting air pipeline (6), the first heat exchange medium pipeline (7), the second heat exchange medium pipeline (8) and the heat extraction bypass pipeline (9) are all provided with a thermal insulation layer.

8. The system for heating combustion-supporting air with waste heat from a tunnel kiln according to claim 7 is characterized in that: A plurality of regulating devices (10) are arranged on each pipeline.

9. The system for heating combustion-supporting air with waste heat from a tunnel kiln according to claim 8 is characterized in that: The regulating device (10) is a gate valve.

10. The system for heating combustion-supporting air with waste heat from a tunnel kiln according to claim 1, characterized in that: It also includes a filter (11) arranged on the heat extraction pipe (5) between the heat exchanger (3) and the tunnel kiln (1).

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