Roller kiln smoke exhaust device and smoke exhaust system

Abstract

The utility model discloses a roller kiln smoke exhaust device and smoke exhaust system, including kiln body and first smoke exhaust device, kiln body, the kiln body is along the conveying direction of rock slab and is provided with preheating zone, firing zone and cooling zone in proper order, first smoke exhaust device is located in preheating zone, first smoke exhaust device includes smoke exhaust main pipeline, a plurality of first smoke exhaust branch pipeline, a plurality of smoke exhaust side pipeline, a plurality of first smoke exhaust bottom pipeline and at least one smoke exhaust fan setting on smoke exhaust main pipeline, a plurality of first smoke exhaust bottom pipeline is interval setting below kiln body, and with the bottom of kiln body is communicated, and the both ends of first smoke exhaust branch pipeline are communicated with smoke exhaust main pipeline and the terminal of corresponding first smoke exhaust bottom pipeline respectively, and the both ends of smoke exhaust side pipeline are communicated with corresponding first smoke exhaust branch pipeline and the middle part of kiln body respectively, the utility model discloses a roller kiln smoke exhaust device and smoke exhaust system can effectively avoid the problem of dirty falling of roller kiln body top, and ensure the firing quality of product.

Description

Technical Field

[0001] This utility model relates to the field of kiln technology, and in particular to a smoke exhaust device and smoke exhaust system for roller kilns. Background Technology

[0002] In the field of building decoration materials, large-format sintered stone slabs are widely used in wall and floor decoration due to their advantages such as high strength, rich texture, and excellent decorative effect. Currently, the production of large-format sintered stone slabs mainly adopts the dry particle polishing process. This process significantly improves the surface performance and decorative texture of the sintered stone slab by spreading dry particles on the surface of the sintered stone blank and then polishing it, thus meeting the market demand for high-quality sintered stone slabs.

[0003] The dry granule polishing process involves a large amount of dry granules and multiple water spraying (or special glaze) processes, resulting in a long firing cycle and generating a large amount of flue gas during firing. Currently, the exhaust vents of kilns are located at the top and sides of the kiln body. When the flue gas is discharged, it easily causes condensation and accumulation of vaporized glaze and other flue gas impurities in the top area, resulting in dirt buildup and affecting the quality of the slabs.

[0004] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a flue gas exhaust device and exhaust system for roller kilns, which aims to solve the technical problem that the top of roller kilns is prone to condensation and accumulation of vaporized glaze and other flue gas impurities, resulting in dirt accumulation and affecting product quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A roller kiln exhaust system includes: The kiln body is provided with a preheating zone, a firing zone and a cooling zone in sequence along the conveying direction of the rock slab. The first exhaust system is located within the preheating zone. The first exhaust system includes a main exhaust duct, several first exhaust branch ducts, several exhaust side ducts, several first exhaust bottom ducts, and at least one exhaust fan installed on the main exhaust duct. Multiple first exhaust bottom ducts are spaced apart below the kiln body and connected to the bottom of the kiln body. The two ends of the first exhaust branch ducts are respectively connected to the end of the main exhaust duct and the corresponding end of the first exhaust bottom duct. The two ends of the exhaust side ducts are respectively connected to the corresponding first exhaust branch duct and the middle of the kiln body.

[0007] Furthermore, the connection port between the exhaust pipe and the kiln body is located above the roller conveyor of the kiln body.

[0008] Furthermore, it also includes a second exhaust device located at the front end of the kiln body. The second exhaust device includes a second exhaust branch pipe, a second exhaust bottom pipe, a first front exhaust pipe, and a second front exhaust pipe. The two ends of the second exhaust branch pipe are respectively connected to the ends of the main exhaust pipe and the bottom exhaust pipe. The two ends of the first front exhaust pipe are respectively connected to the front end of the kiln body and the second exhaust branch pipe, and the connection port of the first front exhaust pipe to the kiln body is located above the roller conveyor of the kiln body. The two ends of the second front exhaust pipe are respectively connected to the front end of the kiln body and the second exhaust bottom pipe, and the connection port of the second front exhaust pipe to the kiln body is located below the roller conveyor of the kiln body.

[0009] Furthermore, the first smoke exhaust device includes two smoke exhaust fans connected in parallel, and the main smoke exhaust duct includes a first main duct and a second main duct; the two smoke exhaust fans connected in parallel are located between the first main duct and the second main duct; the first main duct is connected to multiple first smoke exhaust branch ducts and second smoke exhaust branch ducts.

[0010] Furthermore, the two parallel exhaust fans are connected to the first main pipe via a T-junction, and an emergency bypass pipe is connected to the T-junction; a first gate is provided at the connection between the T-junction and the emergency bypass pipe.

[0011] A smoke extraction system, comprising: At least one heat exchanger is provided, which has a cold source inlet, a cold source outlet, a heat source inlet, and a heat source outlet; the cold source inlet is connected to an external air source; the cold source outlet is connected to a drying kiln through a manifold; and the heat source outlet is connected to a flue gas treatment system. The post-combustion air system is used to introduce combustion air into the firing zone. The air inlet of the post-combustion air system is connected to the collection pipe. The first cold air system is used to introduce cooling air into the cooling zone. The air inlet of the first cold air system is connected to the collecting pipe. The third exhaust system is used to draw hot air from the cooling zone. The outlet of the third exhaust system is connected to the heat source output end of the heat exchanger and to a collecting pipe. The exhaust system for the roller kiln is described, wherein the main exhaust pipe is connected to the heat source input end of the heat exchanger.

[0012] Furthermore, it also includes a front combustion air system; the firing zone is provided with an oxidation section, a firing section and a high heat preservation section in sequence along the output direction of the rock slab; the air inlet of the front combustion air system is connected to an external air source, and the air outlet of the front combustion air system is connected to the oxidation section; the air outlet of the rear combustion air system is connected to the firing section and the high heat preservation section.

[0013] Furthermore, it also includes a second cold air system and a third cold air system, with the air inlets of the second and third cold air systems respectively connected to external air sources; the cooling zone is arranged sequentially along the output direction of the rock slab as a rapid cooling section, a slow cooling section, a direct cooling section, and a tail cooling section; the air outlet of the first cold air system is connected to the rapid cooling section; the air outlet of the second cold air system is connected to the direct cooling section; the air outlet of the third cold air system is connected to the tail cooling section; the third smoke exhaust device includes several first smoke exhaust pipes connected to the slow cooling section, a first main pipe connected to all the first smoke exhaust pipes, several second smoke exhaust pipes connected to the direct cooling section and the tail cooling section, and a second main pipe connected to all the second smoke exhaust pipes. The first main pipe and the second main pipe are connected through a switch valve. The first main pipe is connected to the heat source output end of the heat exchanger; the second main pipe is connected to the manifold.

[0014] Furthermore, all of the first exhaust pipes are connected to the side wall of the kiln body, and the connection port to the kiln body is located above the roller conveyor of the kiln body; all of the second exhaust pipes are connected to the top of the kiln body; the second cold air system and the third cold air system are both connected to the side wall of the kiln body, and the connection port of the second cold air system to the kiln body is located above and below the roller conveyor of the kiln body, respectively; the connection port of the third cold air system to the kiln body is located above and below the roller conveyor of the kiln body, respectively.

[0015] Furthermore, the heat exchanger is configured as two, one of which has its heat source input end connected to the main flue gas duct; the other heat exchanger has its heat source input end connected to the first main pipe and its cold source output end connected to the manifold; the second main pipe is connected to the manifold.

[0016] Beneficial effects: This utility model provides a flue gas exhaust device for a roller kiln. The device is connected to the middle and bottom of the kiln body through a side exhaust pipe and a first bottom exhaust pipe, respectively. By adopting side exhaust and bottom exhaust methods, the device can effectively reduce the condensation and accumulation of vaporized glaze and other flue gas impurities on the top of the kiln body while ensuring exhaust efficiency, thus avoiding the problem of dirt accumulation.

[0017] This invention also provides a flue gas exhaust system. A first exhaust device guides the flue gas generated in the firing zone to the preheating zone, allowing the high-temperature flue gas to preheat the rock slabs in the preheating zone. Subsequently, the flue gas enters a heat exchanger to heat air, which can then be reused in the drying kiln. Simultaneously, combined with a third exhaust device for recovering flue gas from the cooling zone, differentiated utilization can be achieved based on flue gas temperature differences. High-temperature flue gas continues to enter the heat exchanger to recover heat energy, while low-temperature flue gas is directly supplied to the post-combustion air system and the first cold air system, ultimately forming a complete heat energy recovery chain and effectively improving the waste heat utilization efficiency of the kiln. Attached Figure Description

[0018] Figure 1A front view of the roller kiln exhaust device provided by this utility model; Figure 2 A side sectional view of the first exhaust device in the roller kiln exhaust device provided by this utility model; Figure 3 A top view of the main exhaust duct in the roller kiln exhaust device provided by this utility model; Figure 4 A connection diagram of the smoke exhaust system provided by this utility model; Figure 5 A schematic diagram of the connection of the preheating zone in the smoke exhaust system provided by this utility model; Figure 6 A schematic diagram of the connection of the firing zone in the flue gas exhaust system provided by this utility model; Figure 7 This is a schematic diagram of the connection of the cooling belt in the smoke exhaust system provided by this utility model.

[0019] Figure label: Kiln body 1, preheating zone 11, drainage section 111, preheating section 112, firing zone 12, oxidation section 121, firing section 122, high insulation section 123, cooling zone 13, rapid cooling section 131, slow cooling section 132, direct cooling section 133, tail cooling section 134, heat exchanger 2, cold source input end 21, cold source output end 22, heat source input end 23, heat source output end 24, manifold 25, gas system 3, post-combustion air system 4, first cold air system 5, first exhaust device 61, main exhaust pipe 611, first main pipe 6111, second main pipe 6112, tee pipe 6113, emergency bypass pipe 6114, first gate 6115, first exhaust branch pipe 612, second gate Plate 6121, exhaust side pipe 613, third gate 6131, first exhaust bottom pipe 614, exhaust fan 615, fourth gate 6151, fifth gate 6152, second exhaust device 62, second exhaust branch pipe 621, second exhaust bottom pipe 622, first front exhaust pipe 623, sixth gate 6231, second front exhaust pipe 624, seventh gate 6241, third exhaust device 7, first exhaust fan 71, second exhaust fan 72, first exhaust pipe 73, first main pipe 74, second exhaust pipe 75, second main pipe 76, switch valve 77, front combustion air system 8, second cold air system 9, third cold air system 91, drying kiln 10, flue gas treatment system 20. Detailed Implementation

[0020] This utility model provides a flue gas exhaust device and system for a roller kiln. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0022] Please see Figures 1 to 3 As shown, this utility model provides a roller kiln exhaust device, including: a kiln body 1 and a first exhaust device 61; the kiln body 1 is provided with a preheating zone 11, a firing zone 12 and a cooling zone 13 sequentially arranged along the conveying direction of the rock slab; the lengths of the preheating zone 11, the firing zone 12 and the cooling zone 13 are respectively 15%~25%, 45%~55% and 30%~36% of the total length of the kiln body 1; specifically, the preferred length ratios are 20%, 50% and 30%; the first exhaust device 61 is located within the preheating zone 11; the first exhaust device includes an exhaust main... The system includes a main exhaust pipe 611, several first exhaust branch pipes 612, several exhaust side pipes 613, several first exhaust bottom pipes 614, and at least one exhaust fan 615 installed on the main exhaust pipe 611; multiple first exhaust bottom pipes 614 are spaced apart below the kiln body 1 and connected to the bottom of the kiln body 1; the two ends of the first exhaust branch pipes 612 are respectively connected to the end of the main exhaust pipe 611 and the corresponding end of the first exhaust bottom pipe 614; the two ends of the exhaust side pipes 613 are respectively connected to the corresponding first exhaust branch pipes 612 and the middle part of the kiln body 1.

[0023] The kiln body 1 is equipped with roller conveyors for continuously conveying rock slabs forward, allowing them to sequentially undergo preheating, firing, and cooling processes. For example... Figure 5 As shown, during the firing process, the flue gas in the firing zone 12 flows to the preheating zone 11 under the negative pressure guidance of the first flue gas exhaust device 61, and uses the residual heat of the flue gas to preheat the rock slab blank located in the preheating zone 11.

[0024] The present invention relates to a roller kiln exhaust device that sets the connection between the first exhaust device 61 and the kiln body 1 at the middle and bottom of the kiln body 1. This can effectively reduce the condensation and accumulation of vaporized glaze and other flue gas impurities on the top of the kiln body 1, thereby effectively solving the problem of dirt accumulation.

[0025] Preferably, multiple first exhaust pipes 612 are respectively arranged on both sides of the kiln body 1. One end of each pair of first exhaust pipes 612 is connected to the main exhaust pipe 611, and the other end of each pair of first exhaust pipes 612 is connected to the end of a first exhaust bottom pipe 614. Multiple exhaust side pipes 613 are respectively arranged on both sides of the kiln body 1. Both ends of each exhaust side pipe 613 are connected to the corresponding first exhaust pipe 612 and the middle of the kiln body 1. The symmetrical exhaust method can form a uniform symmetrical negative pressure field in the preheating zone, avoiding the local negative pressure imbalance caused by unilateral exhaust. This allows the humid flue gas and glaze-containing flue gas of the kiln body 1 to smoothly enter the pipes along the symmetrical paths on both sides, without any dead corners for flue gas stagnation. This significantly reduces the possibility of vaporized glaze and impurities accumulating locally in the kiln, further solving the problem of dirt accumulation.

[0026] Specifically, multiple first exhaust bottom pipes 614 and multiple first exhaust branch pipes 612 and exhaust side pipes 613 on the same side are arranged sequentially along the length of the kiln body 1. The main exhaust pipe 611 is fixed above the roller kiln body 1 via a platform.

[0027] Further, see Figure 1 , 2 The connection port between the exhaust pipe 613 and the kiln body 1 is located above the roller conveyor of the kiln body 1. During firing, the slab moves on the roller conveyor, and the flue gas generated during the firing process can be discharged from the exhaust port on the side wall.

[0028] In a preferred embodiment, see [reference] Figure 1 It also includes a second exhaust device 62 located at the front end of the kiln body 1. The second exhaust device 62 includes a second exhaust branch pipe 621, a second exhaust bottom pipe 622, a first front exhaust pipe 623, and a second front exhaust pipe 624. Specifically, there are two second exhaust branch pipes 621, which are symmetrically arranged, and their two ends are respectively connected to the ends of the exhaust main pipe 611 and the exhaust bottom pipe 622. The two ends of the first front exhaust pipe 623 are respectively connected to the front end of the kiln body 1 and the second exhaust branch pipe 621, and the connection port of the first front exhaust pipe 623 and the kiln body 1 is located above the roller conveyor of the kiln body 1. The two ends of the second front exhaust pipe 624 are respectively connected to the front end of the kiln body 1 and the second exhaust bottom pipe 622, and the connection port of the second front exhaust pipe 624 and the kiln body 1 is located below the roller conveyor of the kiln body 1. By setting a first front exhaust pipe 623 and a second front exhaust pipe 624 on the front side of the end of the kiln body 1, the flow of flue gas inside the kiln body 1 can be increased, and the accumulation of impurities in the flue gas at the front end of the kiln body 1 can be reduced.

[0029] Preferably, there are two first front exhaust pipes 623, and the two first front exhaust pipes 623 are symmetrically arranged; there are two second front exhaust pipes 624, and the two second front exhaust pipes 624 are symmetrically arranged, so that the left and right suction force at the front end of the kiln body 1 is balanced, and the airflow is avoided from being skewed and the impurities are locally accumulated.

[0030] In a preferred embodiment, see [reference] Figure 3 The first smoke exhaust device 61 includes two smoke exhaust fans 615 connected in parallel. The main smoke exhaust duct 611 includes a first main pipe 6111 and a second main pipe 6112. The two smoke exhaust fans 615 are positioned between the first main pipe 6111 and the second main pipe 6112. The first main pipe 6111 is connected to multiple first smoke exhaust branch pipes 612 and second smoke exhaust branch pipes 621. By arranging the two smoke exhaust fans 615 in parallel, the smoke exhaust effect of the main smoke exhaust duct 611 can be increased. Specifically, the two smoke exhaust fans 615 are mirror-arranged, with the first main pipe 6111 and the second main pipe 6112 located between the two smoke exhaust fans 615, forming a symmetrical structure that branches and then rejoins. This not only reduces duct resistance and improves smoke exhaust efficiency but also optimizes the duct layout and reduces the use of duct materials. The front end of the second main pipe 6112 is provided with two branch interfaces, which are respectively connected to the air outlets of the two smoke exhaust fans 615.

[0031] Preferably, see Figure 2 A second gate 6121 is provided at the bottom of the first smoke exhaust branch pipe 612; a third gate 6131 is provided on the smoke exhaust side pipe 613. Specifically, the second gate 6121 is located above the connection between the first smoke exhaust branch pipe 612 and the first smoke exhaust bottom pipe 614. By adjusting the opening of the second gate 6121 and the third gate 6131, the flow rates of the first smoke exhaust bottom pipe 614 and the smoke exhaust side pipe 613 can be adjusted respectively, thereby adjusting the suction distribution between the smoke exhaust side pipe 613 and the smoke exhaust bottom pipe.

[0032] Preferably, see Figure 1 A sixth gate 6231 is provided on the first front exhaust pipe 623, and a seventh gate 6241 is provided on the second front exhaust pipe 624. The sixth gate 6231 and the seventh gate 6241 are used to adjust the opening degree of the first front exhaust pipe 623 and the second front exhaust pipe 624, respectively. The coordinated use of multiple gates in this invention improves the suction coordination of each exhaust port in the kiln body 1, resulting in higher flue gas emission efficiency.

[0033] Further, see Figure 3Two parallel exhaust fans 615 are connected to the first main pipe 6111 via a T-junction 6113, to which an emergency bypass pipe 6114 is connected. A first gate valve 6115 is installed at the connection between the T-junction 6113 and the emergency bypass pipe 6114. The emergency bypass pipe 6114 is activated when downstream equipment malfunctions. The first gate valve 6115 controls the opening and closing of the emergency bypass pipe 6114. Specifically, the emergency bypass pipe 6114 is located below the T-junction 6113.

[0034] Preferably, see Figure 3 A fourth damper 6151 is provided at the connection end between the first main pipe 6111 and the exhaust fan 615; a fifth damper 6152 is provided at the connection end between the second main pipe 6112 and the exhaust fan 615. The fourth damper 6151 and the fifth damper 6152 are used to adjust the flow rate of the first main pipe 6111 and the second main pipe 6112. For example, if a downstream device malfunctions, the connection between the exhaust fan 615 and the first main pipe 6111 can be disconnected via the fourth damper 6151. The fifth damper 6152 can disconnect the connection between the exhaust fan 615 and the second main pipe 6112.

[0035] In the above-mentioned configuration, the gate valve can be connected to the corresponding pipe via a sliding connection. By controlling the length of the gate valve extending into the pipe, the ventilation cross-sectional area of ​​the pipe can be adjusted, thereby regulating the flow rate. Alternatively, it can be connected to the corresponding pipe via a rotating connection. By controlling the rotation angle of the gate valve, the ventilation cross-sectional area of ​​the pipe can be adjusted, thereby regulating the flow rate. Adjusting the flow rate of a pipe using a gate valve is existing technology. In practical applications, the appropriate gate valve can be selected based on the pipe's structure.

[0036] Please see Figure 4-7 This utility model also provides a flue gas exhaust system, including at least one heat exchanger 2, a post-combustion air system 4, a first cold air system 5, a third flue gas exhaust device 7, and the aforementioned roller kiln flue gas exhaust device; the heat exchanger 2 is provided with a cold source input end 21, a cold source output end 22, a heat source input end 23, and a heat source output end 24; the cold source input end 21 is connected to an external air source; the cold source output end 22 is connected to a drying kiln 10 through a collecting pipe 25; the heat source output end 24 is connected to a flue gas treatment system 20; the post-combustion air system 4 is used to... Combustion air is introduced into the cooling belt 12, and the air inlet of the combustion air system 4 is connected to the collecting pipe 25; the first cold air system 5 is used to introduce cooling air into the cooling belt 13, and the air inlet of the first cold air system 5 is connected to the collecting pipe 25; the third exhaust device 7 is used to extract hot air from the cooling belt 13, and the air outlet of the third exhaust device 7 is connected to the heat source output end 24 of the heat exchanger 2 and the collecting pipe 25; the exhaust main pipe 611 of the roller kiln exhaust device is connected to the heat source input end 23 of the heat exchanger 2.

[0037] The exhaust system mentioned above also includes a gas system 3, which is used to introduce gas into the firing zone 12.

[0038] During the firing process, the heat and flue gas generated by the full combustion of the fuel gas and combustion air in the firing zone 12 flow to the preheating zone 11 under the negative pressure guidance of the roller kiln exhaust device. This residual heat is directly used to preheat the slabs that have not yet entered the firing zone 12. This avoids direct heat loss from the firing zone 12 and ensures a uniform temperature increase of the slabs before they enter the firing zone 12, reducing temperature fluctuations caused by excessive initial temperature differences in the firing zone 12. This ensures the stability of high-temperature firing and reduces the risk of cracking and deformation of the slabs. The hot flue gas discharged from the preheating zone 11 enters the heat exchanger 2 and transfers its heat energy to the external air at the cold source input end 21. The heat-exchanged flue gas then flows to the flue gas treatment system 20 for purification. The air that has absorbed heat energy is split and reused through the collection pipe 25. One part provides a heat source for the drying kiln 10, replacing the additional energy consumption of the drying kiln, and the other part is used for subsequent... Combustion air system 4 and first cold air system 5 provide preheated air sources, reducing the heating energy consumption of combustion air and cooling air. After the slabs are fired, they enter the cooling zone 13. The gas extracted by the third exhaust device 7 is used differently according to temperature. When the temperature is high, it enters the heat exchanger 2 to further recover heat energy. When the temperature is low, it is directly used as combustion air or cooling air source, which greatly reduces energy waste and improves energy utilization. At the same time, the cooling zone 13 achieves orderly cooling of the slabs through the coordination of the first cold air system 5 (connected to the preheated air source of the manifold 25) and the third exhaust device 7, avoiding excessively rapid cooling that may affect the structural stability of the slabs and ensuring continuous production. Moreover, heat recovery reduces the additional energy input of the drying kiln 10, the post combustion air system 4, and the first cold air system 5, greatly reducing production energy consumption costs. Overall, it is in line with the industrial development trend of energy conservation and environmental protection.

[0039] It should be noted that the third smoke exhaust device 7 should be equipped with a temperature detection device (such as a thermocouple). Installing a temperature detection device within the smoke exhaust system is existing technology and can detect the temperature of the flowing flue gas in real time. Therefore, the specific structure and working principle of the temperature detection device will not be elaborated further. The third smoke exhaust device 7 can achieve differentiated utilization based on the flue gas temperature detected by the temperature detection device.

[0040] The heat exchanger 2 and the flue gas treatment system 20 mentioned above are both mature existing technologies in the industrial production field, and are widely used in industries such as ceramics, building materials, and metallurgy that require flue gas treatment and heat recovery. Their specific structures and working principles will not be described in detail here.

[0041] In this embodiment, see Figure 2The preheating zone 11 is provided with a drainage section 111 and a preheating section 112 in sequence along the output direction of the rock slab. Two first smoke exhaust devices 61 are arranged side by side. The front end of one first smoke exhaust device 61 and the other smoke exhaust device 61 are located in the drainage section 111, and the rear end of the other smoke exhaust device 61 is located in the preheating section 112. During operation, the hot flue gas in the firing zone 12 is drawn by the negative pressure of the first exhaust device 61 and flows sequentially to the preheating section 112 and the drainage section 111. The residual heat of the flue gas is transferred to the green body to complete the preheating process. The flue gas that has completed the residual heat transfer is transported to the heat source input section of the heat exchanger 2 through the main exhaust pipe 611 to participate in the subsequent heat energy recovery. This process can avoid the problem of excessively high temperature at the front end of the kiln body 1. At the same time, during the exhaust process, the flue gas is discharged from the middle and bottom of both sides of the kiln body 1 under the synergistic action of the first exhaust bottom pipe 614 and the first exhaust branch pipe 612. This can effectively reduce the condensation and accumulation of vaporized glaze and other flue gas impurities on the top of the kiln body 1, thereby effectively solving the problem of dirt accumulation.

[0042] Further, see Figure 6 It also includes a front combustion air system 8 and a first cold air system 5; the firing zone 12 is sequentially provided with an oxidation section 121, a firing section 122 and a high-insulation section 123 along the output direction of the slab; wherein the oxidation section 121 is mainly responsible for the full oxidation and removal of organic matter and sulfides in the slab blank, the firing section 122 needs to maintain a suitable high temperature to achieve dry particle melting and sintering of the slab, and the high-insulation section 123 is used to ensure the stable performance of the slab after sintering. The air inlet of the front combustion air system 8 is connected to an external air source, and the air outlet of the front combustion air system 8 is connected to the oxidation section 121; the air outlet of the rear combustion air system 4 is connected to the firing section 122 and the high-insulation section 123. The fresh air supplied by the pre-combustion air system 8 provides sufficient oxygen to the oxidation section 121, promoting the complete combustion and decomposition of residual organic matter, sulfides, and other impurities in the slab blank during the heating process. This prevents the formation of internal pores due to impurities, which could affect the structural stability of the slab. At the same time, it prevents incomplete combustion of impurities from producing black smoke that pollutes the surface of the dry particles, ensuring the final decorative texture of the slab. The preheated air supplied by the post-combustion air system 4 has already absorbed the heat energy of the flue gas. When mixed with the gas for combustion, it does not require additional energy consumption for heating. This optimizes the combustion effect of the gas and maintains the stable high-temperature environment required by the firing section 122, preventing local temperature fluctuations caused by excessively low combustion air temperature. The high-insulation section 123, through the continuous supply of post-combustion air, can maintain a uniform overall temperature, preventing the slab from cracking due to internal stress caused by excessively rapid local cooling.

[0043] Further, see Figure 7It also includes a second cold air system 9 and a third cold air system 91, with the air inlets of the second and third cold air systems 9 and 91 respectively connected to external air sources; the cooling zone 13 is arranged sequentially along the output direction of the rock slab with a rapid cooling section 131, a slow cooling section 132, a direct cooling section 133, and a tail cooling section 134. The rapid cooling section 131 quickly reduces the high temperature of the rock slab after firing to lock its structural shape; the slow cooling section 132 slowly cools down to release the internal stress of the rock slab; the direct cooling section 133 and the tail cooling section 134 gradually transition the temperature of the rock slab to room temperature; the air outlet of the first cold air system 5 is connected to the rapid cooling section 131; the air outlet of the second cold air system 9... The first exhaust pipe 7 is connected to the direct cooling section 133; the exhaust end of the third cold air system 91 is connected to the tail cooling section 134, forming a segmented adaptive cooling supply system; the third exhaust device 7 includes several first exhaust pipes 73 connected to the slow cooling section 132, a first main pipe 74 connected to all the first exhaust pipes 73, several second exhaust pipes 75 connected to the direct cooling section 133 and the tail cooling section 134, and a second main pipe 76 connected to all the second exhaust pipes 75. The first main pipe 74 and the second main pipe 76 are connected by a switch valve 77. The first main pipe 74 is connected to the heat source output end 24 of the heat exchanger 2; the second main pipe 76 is connected to the collecting pipe 25. Specifically, a first exhaust fan 71 is provided on the first main pipe 74, and a second exhaust fan 72 is provided on the second main pipe 76. The rapid cooling section 131 quickly removes the high temperature from the surface of the slab through the first cold air system 5, preventing deformation due to structural instability at high temperatures. The slow cooling section 132 relies on the natural cooling rhythm and the third smoke exhaust device 7 to slowly release the internal stress caused by temperature differences within the slab, preventing cracking during later use. The direct cooling section 133 and the tail cooling section 134 gradually replenish fresh air through the second cold air system 9 and the third cold air system 91, allowing the temperature of the slab to drop steadily to room temperature, completely avoiding surface defects caused by sudden changes in cooling rate or uneven cooling, and ensuring the final flatness and structural strength of the slab.

[0044] During this process, the hot air with a higher temperature in the slow cooling section 132 is discharged through the first exhaust pipe 73, the first main pipe 74 and the first exhaust fan 71, and can continue to be connected to the heat exchanger 2 to participate in heat energy recovery, maximizing the utilization of the waste heat carried by the hot air; the hot air with a relatively lower temperature in the direct cooling section 133 and the tail cooling section 134 is transported through the second exhaust pipe 75, the second main pipe 76 and the second exhaust fan 72. According to the real-time needs of the system, the hot air flow direction of the second main pipe 76 and the first main pipe 74 can be controlled by the switch valve 77, or it can be directly connected to the collection pipe 25 as a supplementary air source for combustion air and cooling air.

[0045] Further, see Figure 7All of the first exhaust pipes 73 are connected to the side wall of the kiln body 1, and the connection port to the kiln body 1 is located above the roller conveyor of the kiln body 1. In the slow cooling section 132, the rock slabs have just transitioned from the rapid cooling section 131, and their surfaces still have a relatively high temperature. Hot air, due to its lower density, naturally accumulates in the area above the roller conveyor. Connecting the first exhaust pipes 73 here allows for direct extraction of the accumulated high-temperature hot air, maximizing waste heat recovery efficiency. All of the second exhaust pipes 75 are connected to the top of the kiln body 1. The second cold air system 9 and the third cold air system 91 are both connected to the side wall of the kiln body 1, and the connection ports of the second cold air system 9 and the kiln body 1 are located above and below the roller conveyor of the kiln body 1, respectively. Through the above arrangement, the cold air evenly coats the rock slabs, achieving a uniform cooling effect.

[0046] Further, see Figure 4 The heat exchanger 2 is configured as two, one of which has its heat source input end 23 connected to the air outlet end of the main exhaust pipe 611; the other heat exchanger 2 has its heat source input end 23 connected to the first main pipe 74, and its cold source output end 22 connected to the collecting pipe 25; the second main pipe 76 is connected to the collecting pipe 25. By employing two heat exchangers 2 with differentiated functions, heat energy from flue gas at different temperatures can be recovered in a targeted manner: the heat exchanger 2 connected to the main exhaust pipe 611 mainly handles the high-temperature flue gas discharged from the preheating zone 11, which carries a high amount of heat energy to fully heat the air at the cold source end, meeting the drying kiln 10's requirement for preheated air at a higher temperature; while the heat exchanger 2 connected to the first main pipe 74 is used to recover the medium-temperature hot air discharged from the slow cooling section 132. Although its temperature is lower than the flue gas in the preheating zone 11, it can still effectively heat the cold source air, and its cold source output end 22 is directly connected to the collecting pipe 25, which can transport this part of the medium-temperature preheated air to the subsequent combustion air, the first cold air system 5, and other links that require a medium-temperature air source, avoiding the waste caused by the "low utilization" of the heat energy of the high-heat flue gas.

[0047] It should be noted that valves should be installed on each of the above pipelines to control or cut off the flow of gas in the pipeline. Installing valves on pipelines is existing technology and will not be elaborated on here.

[0048] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of the appended claims of this utility model.

Claims

1. A flue gas exhaust device for a roller kiln, characterized in that, include: The kiln body (1) is provided with a preheating zone (11), a firing zone (12) and a cooling zone (13) in sequence along the conveying direction of the rock slab. The first exhaust device (61) is located in the preheating zone (11). The first exhaust device includes a main exhaust pipe (611), a number of first exhaust branch pipes (612), a number of exhaust side pipes (613), a number of first exhaust bottom pipes (614), and at least one exhaust fan (615) installed on the main exhaust pipe (611). Multiple first exhaust bottom pipes (614) are spaced apart below the kiln body (1) and connected to the bottom of the kiln body (1). The two ends of the first exhaust branch pipes (612) are respectively connected to the ends of the main exhaust pipe (611) and the corresponding first exhaust bottom pipes (614). The two ends of the exhaust side pipes (613) are respectively connected to the corresponding first exhaust branch pipes (612) and the middle part of the kiln body (1).

2. The exhaust gas device for roller kilns according to claim 1, characterized in that, The connection port between the exhaust pipe (613) and the kiln body (1) is located above the roller conveyor of the kiln body (1).

3. The exhaust gas device for roller kilns according to claim 1, characterized in that, It also includes a second exhaust device (62) located at the front end of the kiln body (1). The second exhaust device (62) includes a second exhaust branch pipe (621), a second exhaust bottom pipe (622), a first front exhaust pipe (623), and a second front exhaust pipe (624). The two ends of the second exhaust branch pipe (621) are respectively connected to the ends of the exhaust main pipe (611) and the second exhaust bottom pipe (622). The two ends of the first front exhaust pipe (623) are respectively connected to the front end of the kiln body (1) and the second exhaust branch pipe (621), and the connection port of the first front exhaust pipe (623) and the kiln body (1) is located above the roller conveyor of the kiln body (1). The two ends of the second front exhaust pipe (624) are respectively connected to the front end of the kiln body (1) and the second exhaust bottom pipe (622), and the connection port of the second front exhaust pipe (624) and the kiln body (1) is located below the roller conveyor of the kiln body (1).

4. The exhaust gas device for roller kilns according to claim 3, characterized in that, The first smoke exhaust device (61) includes two smoke exhaust fans (615) connected in parallel. The main smoke exhaust pipe (611) includes a first main pipe (6111) and a second main pipe (6112). The two smoke exhaust fans (615) connected in parallel are located between the first main pipe (6111) and the second main pipe (6112). The first main pipe (6111) is connected to multiple first smoke exhaust branch pipes (612) and second smoke exhaust branch pipes (621).

5. The exhaust gas device for roller kilns according to claim 4, characterized in that, Two parallel exhaust fans (615) are connected to the first main pipe (6111) via a three-way pipe (6113), and an emergency bypass pipe (6114) is connected to the three-way pipe (6113); a first gate (6115) is provided at the connection between the three-way pipe (6113) and the emergency bypass pipe (6114).

6. A smoke extraction system, characterized in that, include: At least one heat exchanger (2) is provided with a cold source input end (21), a cold source output end (22), a heat source input end (23) and a heat source output end (24); the cold source input end (21) is connected to an external air source; the cold source output end (22) is connected to a drying kiln (10) through a manifold (25); the heat source output end (24) is connected to an external flue gas treatment system (20). The post-combustion air system (4) is used to introduce combustion air into the firing zone (12). The air inlet of the post-combustion air system (4) is connected to the manifold (25). The first cold air system (5) is used to introduce cooling air into the cooling zone (13). The air inlet of the first cold air system (5) is connected to the manifold (25). The third exhaust device (7) is used to draw hot air from the cooling zone (13). The exhaust end of the third exhaust device (7) is connected to the heat source output end (24) of the heat exchanger (2) and to the manifold (25); and The exhaust gas device for a roller kiln as described in any one of claims 1-5, wherein the main exhaust pipe (611) is connected to the heat source input end (23) of the heat exchanger (2).

7. The smoke extraction system according to claim 6, characterized in that, It also includes a front combustion air system (8); the firing zone (12) is provided with an oxidation section (121), a firing section (122) and a high heat preservation section (123) in sequence along the output direction of the rock slab; the air inlet of the front combustion air system (8) is connected to an external air source, and the air outlet of the front combustion air system (8) is connected to the oxidation section (121); the air outlet of the rear combustion air system (4) is connected to the firing section (122) and the high heat preservation section (123).

8. The smoke extraction system according to claim 6, characterized in that, It also includes a second cold air system (9) and a third cold air system (91), the air inlets of the second cold air system (9) and the third cold air system (91) being connected to external air sources respectively; the cooling belt (13) is provided with a rapid cooling section (131), a slow cooling section (132), a direct cooling section (133) and a tail cooling section (134) in sequence along the output direction of the rock slab; the air outlet of the first cold air system (5) is connected to the rapid cooling section (131); the air outlet of the second cold air system (9) is connected to the direct cooling section (133); the air outlet of the third cold air system (91) is connected to the tail cooling section (134); the first The three-exhaust system (7) includes several first exhaust pipes (73) connected to the slow cooling section (132), a first main pipe (74) connected to all the first exhaust pipes (73), several second exhaust pipes (75) connected to the direct cooling section (133) and the tail cooling section (134), and a second main pipe (76) connected to all the second exhaust pipes (75). The first main pipe (74) and the second main pipe (76) are connected by a switch valve (77). The first main pipe (74) is connected to the heat source output end (24) of the heat exchanger (2). The second main pipe (76) is connected to the manifold (25).

9. The smoke extraction system according to claim 8, characterized in that, All of the first exhaust pipes (73) are connected to the side wall of the kiln body (1), and the connection port of the kiln body (1) is located above the roller conveyor of the kiln body (1); all of the second exhaust pipes (75) are connected to the top of the kiln body (1); the second cold air system (9) and the third cold air system (91) are both connected to the side wall of the kiln body (1), and the connection port of the second cold air system (9) and the kiln body (1) is located above and below the roller conveyor of the kiln body (1), respectively; the connection port of the third cold air system (91) and the kiln body (1) is located above and below the roller conveyor of the kiln body (1), respectively.

10. The smoke extraction system according to claim 8, characterized in that, The heat exchanger (2) is configured as two, one of which has its heat source input end (23) connected to the main flue gas pipe (611); the other heat exchanger (2) has its heat source input end (23) connected to the first main pipe (74), and its cold source output end (22) connected to the manifold (25); the second main pipe (76) is connected to the manifold (25).

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