Heat exchange apparatus and method for a floor blank drying kiln

Abstract

The application discloses a floor blank drying kiln heat exchange device, and relates to the technical field of drying kilns.The device comprises a drying kiln main body, a drying cavity for placing floor blanks is arranged in the drying kiln main body, an inlet and outlet for the floor blanks to enter and exit are arranged at one end of the drying cavity, a first heat exchange mechanism is arranged at the other end of the drying cavity, second heat exchange mechanisms are arranged on the inner walls of the two sides of the drying cavity, a drying machine for synchronously providing hot gas to the first heat exchange mechanism and the second heat exchange mechanisms is arranged on the drying kiln main body, and the first heat exchange mechanism is provided with a first heat exchange box body communicated with the drying machine.The arrangement of the first heat exchange mechanism and the second heat exchange mechanisms avoids the decrease of the drying rate caused by the insufficient air outlet temperature or the impact on the end of the blank caused by the excessively high air outlet temperature, guarantees the uniformity of the heat received by the floor blank, makes the temperature of the hot gas finally sent into the drying cavity constant and the heat sufficient, avoids the uneven temperature distribution, and improves the drying heat exchange effect.

Description

Technical Field

[0001] This invention relates to the field of drying kiln technology, and more specifically, to a heat exchange device and method for drying floor blanks in a kiln. Background Technology

[0002] In the process of flooring blank processing, the drying process is the core process that determines the quality of the finished flooring. Its core purpose is to uniformly remove the internal moisture of the blank, ensure that the moisture content of the blank is uniform and the structure is stable, and avoid quality defects such as cracking, deformation, and warping during subsequent processing and use. As the core equipment for drying flooring blanks, the heat exchange uniformity, rational airflow circulation, and precise temperature and humidity control of the internal heat exchange system of the drying kiln directly determine the drying quality.

[0003] Existing floor blank drying kilns mostly adopt a single hot gas direct-blowing heat exchange structure, relying solely on the hot gas output from the dryer to directly enter the drying chamber to complete the heat exchange and drying operation. The heat exchange method is singular, only achieving single-pass hot gas heat exchange, resulting in low thermal energy utilization. Heat loss easily occurs during the transport of hot gas, and the heating rate inside the drying chamber is slow and the temperature distribution is uneven, leading to local over-drying and incomplete drying of the floor blanks. The overall moisture content of the blanks is inconsistent, significantly increasing the product scrap rate. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a heat exchange device and method for drying floor blanks in a kiln.

[0005] The technical solution is as follows:

[0006] A heat exchange device and method for drying floor blanks in a kiln includes a drying kiln body, a drying chamber for placing floor blanks inside the drying kiln body, an inlet and outlet for the floor blanks to enter and exit at one end of the drying chamber, a first heat exchange mechanism installed at the other end of the drying chamber, and second heat exchange mechanisms installed on both sides of the inner wall of the drying chamber. A dryer for simultaneously providing hot gas to the first heat exchange mechanism and the second heat exchange mechanism is installed on the drying kiln body.

[0007] The first heat exchange mechanism has a first heat exchange box that is connected to the dryer. Multiple first heat exchange fins are horizontally arranged along the vertical outer wall of the first heat exchange box. The first heat exchange fins are used to exchange heat with the air in the drying chamber. Each adjacent first heat exchange fin has a first air outlet that is connected to the first heat exchange box. The first air outlet is used to transport hot air into the drying chamber. A first hot water exchange passage is installed between the multiple first heat exchange fins and the first air outlet. The first hot water exchange passage is used to exchange heat with the hot gas in the first air outlet to achieve secondary heating of the hot gas.

[0008] Furthermore, return air inlets are provided on the side walls near the inlet and outlet of the drying chamber. The return air inlets are connected to air ducts that work with the dryer to form a circulating airflow, and a gate is installed in the air ducts.

[0009] Furthermore, the main body of the drying kiln is equipped with a circulating hot water mechanism connected to the first hot water exchange circuit. The circulating hot water mechanism includes a water tank, inside which there is a heating chamber connected to the inlet end of the first hot water exchange circuit and a recovery chamber connected to the outlet end of the first hot water exchange circuit. A circulating pump for circulating the hot water medium in the first hot water exchange circuit is installed in the heating chamber, and a heating device is installed in the recovery chamber for heating the hot water medium in the recovery chamber. A liquid pump for sending the heated hot water medium to the heating chamber is installed in the recovery chamber.

[0010] Furthermore, the first heat exchange chamber has a plurality of first distribution chambers arranged at equal intervals along the vertical direction, and a first diversion component for connecting the dryer with the plurality of first distribution chambers is installed on the side wall of the first heat exchange chamber.

[0011] Furthermore, the first heat exchange circuit has a first serpentine coil section that mates with the first heat exchange fins, and the first air outlet has multiple first channels that pass through the pipe gap of the first serpentine coil section and communicate with the corresponding first distribution cavity. The end of the first air outlet away from the first distribution cavity has a first air outlet cavity that communicates with the multiple first channels. A first guide plate is rotatably installed inside the first air outlet cavity, and a first drive assembly is installed on the outer wall of the first air outlet. The first drive assembly is used to adjust the rotation angle of the first guide plate to achieve airflow compensation for different parts of the floor blank.

[0012] Furthermore, the second heat exchange mechanism includes a second heat exchange box located on both sides of the drying chamber. Multiple second heat exchange fins are horizontally arranged along the vertical outer wall of the second heat exchange box. The second heat exchange fins are used to exchange heat with the air inside the drying chamber. Each adjacent second heat exchange fin has a second air outlet that communicates with the second heat exchange box. The second air outlet is used to transport hot air into the drying chamber. A second hot water exchange passage is installed between the multiple second heat exchange fins and the second air outlet. The second hot water exchange passage is used to exchange heat with the hot gas inside the second air outlet.

[0013] Furthermore, the second heat exchange chamber has a plurality of second distribution chambers arranged at equal intervals along the vertical direction, and a second diversion component for connecting the dryer with the plurality of second distribution chambers is installed on the side wall of the second heat exchange chamber.

[0014] Furthermore, the drying chamber has a guide surface on the side wall near the inlet and outlet, the second hot water exchange circuit has a second serpentine coil section that mates with the second heat exchange fins and a condenser section that mates with the guide surface, the second air outlet has multiple second channels that pass through the pipe gap of the second serpentine coil section and communicate with the corresponding second distribution chamber, the end of the second air outlet away from the second distribution chamber has a second air outlet cavity that communicates with the multiple second channels, a second guide plate is rotatably installed in the second air outlet cavity, and a second drive assembly is installed on the outer wall of the second air outlet. The second drive assembly is used to adjust the rotation angle of the second guide plate to achieve airflow compensation for different parts of the floor blank.

[0015] Furthermore, the inlet end of the second hot water exchange circuit is connected to the heating chamber, and the outlet end of the second hot water exchange circuit is connected to the recovery chamber. The drying chamber and the bottom wall corresponding to the second heat exchange fins and the condenser tube are provided with collection tanks for collecting condensate. The collection tanks are provided with collection tanks for collecting condensate at the corresponding positions of the second heat exchange fins. The second hot water exchange circuit has a return flow section that cooperates with the collection tanks. The return flow section is equipped with a third heat exchange fin at the corresponding position of the second heat exchange fins.

[0016] A heat exchange method for a floor blank drying kiln heat exchange device includes the following steps:

[0017] S1. The dryer disperses and transports hot gas to the corresponding first and second distribution chambers through the first and second diverters. The gas in the drying chamber undergoes preliminary heat exchange with the hot gas in the first and second distribution chambers through the second heat exchange fins and the first heat exchange fins.

[0018] S2. When the hot gas that has undergone preliminary heat exchange in the first distribution chamber and the second distribution chamber passes through the first air outlet and the second air outlet, it undergoes secondary heat exchange in the corresponding first and second channels through the first and second heat exchange water circuits.

[0019] S3. The hot gas that has undergone preliminary heat exchange is reheated and then transported to the drying chamber through the first and second air outlets for circulating heat exchange.

[0020] Based on the above, the beneficial effects of the heat exchange device and method for drying floor blanks in this invention are as follows:

[0021] By arranging the first heat exchange fins horizontally and evenly, the contact area between the first heat exchange mechanism and the air inside the drying chamber can be significantly increased, achieving comprehensive preliminary heat exchange between the air inside the drying chamber and the hot air inside the first distribution chamber. This ensures a uniform base temperature inside the drying chamber. Simultaneously, by integrating the first hot water exchange circuit into the gap between the first heat exchange fins and the first air outlet, the heat loss of the hot gas during its flow through the first distribution chamber and the first heat exchange fins can be compensated by the heat conduction effect of the constant-temperature hot water medium in the first hot water exchange circuit. This reduces the deviation between the temperature of the ejected hot gas and the set temperature, preventing a decrease in drying rate due to insufficient outlet air temperature or impact on the end of the blank due to excessively high outlet air temperature. This ensures the uniformity of heating of the floor blank, making the temperature of the hot gas finally sent into the drying chamber constant and the heat sufficient, avoiding uneven temperature distribution and improving the drying heat exchange effect.

[0022] The first hot water exchange circuit serves as the heat source for secondary heating. When the dryer output fluctuates and the outlet air temperature changes, it constructs a compensation for the gas phase temperature fluctuation, so that even if the dryer output fluctuates, the airflow temperature sent into the drying chamber can still maintain high stability, reducing the difficulty of control and the thermal stress damage to the bottom plate billet caused by temperature pulses.

[0023] The condenser tubes are arranged in close contact with the inlet and outlet guide surfaces of the drying chamber. As the hot water medium in the second heat exchange circuit exchanges heat with the hot gas in the second air outlet, its temperature drops. When passing through the condenser tubes, condensate will form on the outer wall of the condenser tubes and drip into the collection tank for collection. As the humidity inside the drying kiln changes, the condensate will be evaporated again and circulated inside the drying kiln. This avoids the evaporation of moisture inside the floor blank into the circulating airflow, and the direct discharge of the high-humidity airflow carrying water vapor through the circulating return air vent, which would cause cracking and deformation problems due to rapid drying and uneven temperature and humidity. Attached Figure Description

[0024] Figure 1 This is a schematic front cross-sectional view of the entire invention;

[0025] Figure 2 This is a schematic diagram of the overall top cross-section of the present invention;

[0026] Figure 3 This is a side cross-sectional view of the present invention;

[0027] Figure 4 This is a schematic diagram of the second top cross-section of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the first heat exchange mechanism, the second heat exchange mechanism, the dryer, and the circulating hot water mechanism of the present invention;

[0029] Figure 6 This is a schematic diagram of the first heat exchange mechanism of the present invention;

[0030] Figure 7 This is a top cross-sectional view of the first air outlet component of the present invention;

[0031] Figure 8 This is a schematic diagram of the second heat exchange mechanism of the present invention;

[0032] Figure 9 This is a rear cross-sectional view of the second heat exchange mechanism of the present invention.

[0033] The reference numerals in the appendix of this invention are as follows:

[0034] 100. Drying kiln body; 110. Drying chamber; 111. Return air inlet; 112. Air duct; 113. Collection tank; 114. Gathering tank; 115. Guide surface; 200. First heat exchange mechanism; 210. First heat exchange box; 211. First distribution chamber; 220. First heat exchange fins; 230. First heat exchange water path; 240. First air outlet; 250. First guide plate; 260. First diverter. 300, Second heat exchange mechanism; 310, Second heat exchange box; 311, Second distribution chamber; 320, Second heat exchange fins; 330, Second hot water exchange path; 331, Condensation tube section; 332, Third heat exchange fins; 340, Second air outlet; 350, Second guide plate; 360, Second flow divider; 400, Dryer; 500, Circulating hot water mechanism; 510, Heating chamber; 520, Recovery chamber. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] The embodiments provided by the present invention will be described in detail below:

[0037] Example 1

[0038] like Figures 1 to 9 As shown, a heat exchange device for a floor blank drying kiln includes a drying kiln body 100, a drying chamber 110 for placing floor blanks inside the drying kiln body 100, an inlet and outlet for the floor blanks to enter and exit at one end of the drying chamber 110, a first heat exchange mechanism 200 installed at the other end of the drying chamber 110, and second heat exchange mechanisms 300 installed on both sides of the inner wall of the drying chamber 110. A dryer 400 is installed on the drying kiln body 100 for simultaneously providing hot gas to the first heat exchange mechanism 200 and the second heat exchange mechanism 300.

[0039] The first heat exchange mechanism 200 has a first heat exchange box 210 connected to the dryer 400. The first heat exchange box 210 has a plurality of horizontally arranged first heat exchange fins 220 installed along its vertical outer wall. The first heat exchange fins 220 are used to exchange heat with the air in the drying chamber 110. Each adjacent first heat exchange fin 220 has a first air outlet 240 connected to the first heat exchange box 210. The first air outlet 240 is used to transport hot air into the drying chamber 110. A first hot water exchange passage 230 is installed between the plurality of first heat exchange fins 220 and the first air outlet 240. The first hot water exchange passage 230 is used to exchange heat with the hot gas in the first air outlet 240 to achieve secondary heating of the hot gas.

[0040] It should be noted that in this embodiment, the first heat exchange fins 220 are arranged in a horizontal and uniform manner, which can significantly increase the contact heat exchange area between the first heat exchange mechanism 200 and the air inside the drying chamber 110. This enables comprehensive preliminary heat exchange between the air inside the drying chamber 110 and the hot air inside the first distribution chamber 211, ensuring a uniform base temperature inside the drying chamber. At the same time, the first hot water exchange path 230 is integrated into the gap area between the first heat exchange fins 220 and the first air outlet 240. It can rely on the heat conduction effect of the constant temperature hot water medium in the first hot water exchange path 230 to compensate for the heat loss of the hot gas during the flow of the hot gas through the first distribution chamber 211 and the first heat exchange fins 220. This reduces the deviation between the temperature of the ejected hot gas and the set temperature, avoids the drying rate from decreasing due to insufficient outlet air temperature, or the impact of excessively high outlet air temperature on the end of the blank, ensures the uniformity of heating of the floor blank, and makes the temperature of the hot gas finally sent into the drying chamber 110 constant and the heat sufficient, avoiding uneven temperature distribution and improving the drying heat exchange effect.

[0041] like Figure 1 and Figure 2 As shown, the drying chamber 110 has a return air inlet 111 on the side wall near the inlet and outlet. The return air inlet 111 is connected to an air duct 112 that works with the dryer 400 to form a circulating airflow. A gate is installed at the air duct 112.

[0042] It should be noted that, in this embodiment, the return air inlet 111 provided on the side wall of the inlet and outlet end of the drying chamber 110, together with the external air duct 112, forms a closed-loop airflow circulation path within the drying chamber 110. The gate at the air duct 112 can be flexibly opened and closed and its opening degree adjusted according to the drying process, temperature and humidity parameters and moisture content parameters within the chamber. In the initial stage of drying heat exchange, the air duct flow rate can be reduced by adjusting the gate to decrease the airflow circulation rate and prevent a large air volume from quickly carrying away the surface moisture of the billet. In the middle and later stages of drying heat exchange, the air duct flow rate can be increased to accelerate the circulation and replacement of humid waste gas within the chamber.

[0043] like Figures 2 to 5As shown, a circulating hot water mechanism 500 connected to the first hot water exchange circuit 230 is installed on the main body 100 of the drying kiln. The circulating hot water mechanism 500 includes a water tank, and the inside of the water tank has a heating chamber 510 connected to the water inlet of the first hot water exchange circuit 230 and a recovery chamber 520 connected to the water outlet of the first hot water exchange circuit 230. A circulation pump for circulating the hot water medium in the first hot water exchange circuit 230 is installed in the heating chamber 510. A heating device is installed in the recovery chamber 520 for heating the hot water medium in the recovery chamber 520. A liquid pump for sending the heated hot water medium to the heating chamber 510 is installed in the recovery chamber 520.

[0044] It should be noted that in this embodiment, the circulating hot water mechanism 500 adopts a dual-chamber split structure. The heating chamber 510 and the recovery chamber 520 respectively realize the constant temperature supply of hot water medium and the recovery and circulation of medium after heat exchange. Together with the circulation pump and the liquid pump, a fully automatic closed-loop water circulation system is formed. The recovery chamber 520 can accurately collect the hot water medium whose temperature has decreased after heat exchange in the first hot water exchange circuit 230. The cooled medium is reheated at a constant temperature through the built-in heating device to make up for the heat loss in heat exchange. Then, the liquid pump delivers the restored constant temperature hot water medium to the heating chamber 510, so as to continuously provide a stable temperature heat exchange medium for the first hot water exchange circuit 230 and ensure that the temperature is constant throughout the secondary heating process.

[0045] Understandably, the first hot water exchange circuit 230 serves as the heat source for secondary heating. When the output of the dryer 400 fluctuates and the outlet air temperature changes, it constructs a compensation for the fluctuation of the gas phase temperature. This ensures that even if the output of the dryer 400 fluctuates, the airflow temperature sent into the drying chamber 110 can still maintain high stability, reducing the difficulty of control and the thermal stress damage to the bottom plate billet caused by temperature pulses.

[0046] like Figures 1 to 9 As shown, the first heat exchange chamber 210 has a plurality of first distribution chambers 211 arranged at equal intervals along the vertical direction, and a first diverter 260 for connecting the dryer 400 with the plurality of first distribution chambers 211 is installed on the side wall of the first heat exchange chamber 210.

[0047] It should be noted that in this embodiment, the multiple first distribution chambers 211 vertically and equally spaced inside the first heat exchange chamber 210, together with the diversion and guiding effect of the first diversion component 260, can evenly distribute the high-temperature hot gas output from the dryer 400 to each independent first distribution chamber 211, realizing equal, layered, and zoned delivery of hot gas. This can specifically match the drying and heat exchange requirements of floor blanks of different heights, allowing each part of the stacked floor blanks to receive equal heat from the hot gas, avoiding the differential problem of the upper floor blanks being too dry and the lower floor blanks having excessive moisture content, improving the drying and heat exchange qualification rate of the floor blanks. At the same time, the diversion structure reduces the convective impact force of hot gas, reducing the situation where the surface of the floor blanks is washed away by strong airflow and loses water.

[0048] like Figure 6 and Figure 7 As shown, the first heat exchange circuit 230 has a first serpentine coil section that cooperates with the first heat exchange fins 220. The first air outlet 240 has multiple first channels that pass through the pipe gap of the first serpentine coil section and communicate with the corresponding first distribution cavity 211. The end of the first air outlet 240 away from the first distribution cavity 211 has a first air outlet cavity that communicates with the multiple first channels. A first guide plate 250 is rotatably installed in the first air outlet cavity. A first drive assembly is installed on the outer wall of the first air outlet 240. The first drive assembly is used to adjust the rotation angle of the first guide plate 250 to achieve airflow compensation for different parts of the floor blank.

[0049] It should be noted that in this embodiment, the first hot water exchange circuit 230 adopts a first serpentine coil structure, which significantly extends the heat exchange contact path and heat exchange time between the hot water medium and the hot gas in the first channel compared to the straight pipe water circuit. This ensures that the hot gas flowing through each first channel can be fully reheated, avoiding the problem of uneven temperature of hot gas in a single channel. At the same time, multiple parallel first channels can disperse the concentrated hot gas into multiple gentle airflows, reducing the airflow speed and impact force. Combined with the angle-adjustable first guide plate 250, the air outlet direction and air outlet coverage can be flexibly adjusted according to different working conditions such as the thickness of the floor blank, the placement spacing, and blind spots at the edges and corners, providing precise airflow compensation for dead corner areas such as the edges and gaps of the blank and areas with weak heat exchange during drying.

[0050] like Figure 8 and Figure 9As shown, the second heat exchange mechanism 300 includes a second heat exchange box 310 located on both sides of the drying chamber 110. Multiple second heat exchange fins 320 are horizontally arranged along the vertical outer wall of the second heat exchange box 310. The second heat exchange fins 320 are used for heat exchange with the air inside the drying chamber 110. Each adjacent second heat exchange fin 320 has a second air outlet 340 communicating with the second heat exchange box 310. The second air outlet 340 is used to transport hot air into the drying chamber 110. A second hot water exchange passage 330 is installed between the multiple second heat exchange fins 320 and the second air outlet 340. The second hot water exchange passage 330 is used to exchange heat with the hot gas inside the second air outlet 340.

[0051] It should be noted that in this embodiment, the second heat exchange mechanism 300 is symmetrically arranged on the left and right sides of the drying chamber 110, forming a three-sided surrounding heat exchange and air supply structure with the first heat exchange mechanism 200 at the end. This compensates for the structural defects of traditional single-end air supply, which can only achieve unidirectional heating, low temperature and humidity on both sides of the chamber, and uneven airflow distribution. The second heat exchange fins 320 also adopt a horizontally dense arrangement structure, which can achieve rapid preliminary heat exchange of air in the areas on both sides of the drying chamber 110, balance the temperature field on the left and right sides of the drying chamber 110, and simultaneously heat the hot gas of the second air outlet 340. Together with the first heat exchange mechanism 200, they form a synergistic heat exchange system, making the temperature of the drying chamber 110 uniform in the horizontal and vertical directions, and fully covering the internal drying space of the drying chamber 110. This improves the overall structural stability of the billet and reduces quality problems such as warping and unilateral deformation.

[0052] The second heat exchange chamber 310 has a plurality of second distribution chambers 311 arranged at equal intervals along the vertical direction. A second diverter 360 for connecting the dryer 400 with the plurality of second distribution chambers 311 is installed on the side wall of the second heat exchange chamber 310.

[0053] It should be noted that in this embodiment, the second distribution chamber 311, which is vertically and equally spaced inside the second heat exchange box 310, works in conjunction with the second diverter 360 to achieve precise and equal diversion of hot gas from the dryer 400 to different height areas on both sides of the drying chamber 110. When used in conjunction with the first distribution chamber 211, it achieves precise air delivery to both sides of the drying chamber 110, balancing the airflow field and temperature field of the entire drying chamber 110.

[0054] like Figures 1 to 4As shown, the drying chamber 110 has a guide surface 115 on the side wall near the inlet and outlet. The second heat exchanger 330 has a second serpentine coil section that cooperates with the second heat exchange fins 320 and a condenser section 331 that cooperates with the guide surface 115. The guide surface 115 is arc-shaped, so that when the airflow circulates in the drying chamber 110, the airflow is guided by the guide surface 115 to achieve uniform air delivery from the side to the end of the floor blank near the inlet and outlet. The second air outlet 340 has multiple second channels that pass through the pipe gap of the second serpentine coil section and are connected to the corresponding second distribution chamber 311. The end of the second air outlet 340 away from the second distribution chamber 311 has a second air outlet cavity that is connected to the multiple second channels. A second guide plate 350 is rotatably installed in the second air outlet cavity. A second drive assembly is installed on the outer wall of the second air outlet 340. The second drive assembly is used to adjust the rotation angle of the second guide plate 350 to achieve airflow compensation for different parts of the floor blank.

[0055] It should be noted that in this embodiment, the second heat exchange circuit 330 integrates the second serpentine coil section and the condenser section 331. The second serpentine coil section is responsible for the full-area secondary heating of the hot gas in the second channel, ensuring the constant air supply temperature at the second heat exchange fins 320 and the second air outlet. At the same time, the multi-channel dispersed air supply of the second air outlet 340, together with the adjustable angle second guide plate 350, forms an all-round airflow compensation system with the end first guide plate 250. The air outlet direction and air volume on both sides can be flexibly adjusted according to the placement position and size difference of the floor blank to meet the needs of drying heat exchange.

[0056] The inlet of the second heat exchanger circuit 330 is connected to the heating chamber 510, and the outlet of the second heat exchanger circuit 330 is connected to the recovery chamber 520. The drying chamber 110 and the bottom wall corresponding to the second heat exchange fin 320 and the condenser tube section 331 are provided with a collection tank 113 for collecting condensate. The collection tank 113 and the second heat exchange fin 320 are respectively provided with a collection tank 114 for collecting condensate. The second heat exchanger circuit 330 has a return section that cooperates with the collection tank 113. The return section and the second heat exchange fin 320 are respectively provided with a third heat exchange fin 332.

[0057] It should be noted that the condenser pipe section 331 is arranged in close contact with the inlet and outlet guide surfaces 115 of the drying chamber. As the hot water medium in the second hot water exchange circuit 330 exchanges heat with the hot gas in the second air outlet 340, the temperature drops. When passing through the condenser pipe section 331, condensate will form on the outer wall of the condenser pipe section 331 and drip into the collection tank 113 for collection. As the humidity changes in the drying kiln 110, the condensate will be evaporated again and circulated in the drying kiln 110. This avoids the moisture inside the floor blank evaporating into the circulating airflow and the high humidity airflow carrying water vapor being directly discharged through the circulating return air port, which would cause cracking and deformation problems caused by rapid drying and uneven temperature and humidity.

[0058] Furthermore, since the guide surface 115 is located inside the return air inlet 111, which is in the path that the circulating airflow must pass through, the guide surface 115 can guide and gather the circulating airflow, so that the airflow can fully contact the condenser tube section 331 and improve the contact effect with the condenser tube section 331.

[0059] Understandably, by setting up the collection tank 113, the gathering tank 114, and the third heat exchange fin 332, and cooperating with the return section of the second heat exchange water circuit 330, a complete water circulation system of condensation, collection, storage, and secondary evaporation is constructed. The collection tank 113 and the gathering tank 114 collect and temporarily store the condensate flowing down from the surface of the condenser tube section 331, preventing it from dripping back onto the floor blank. The third heat exchange fin 332 is installed in the return section, using the medium in the heat exchange water circuit that still has residual heat to gently heat the collected condensate, actively promoting the secondary evaporation of the condensate into water vapor. This allows for kiln humidification without an external water source, enabling the water that would otherwise need to be discharged to be recycled as a humidification medium. This avoids the problem that if the water vapor in the kiln cannot be effectively controlled, the continuous forced convection of high-temperature hot air will quickly remove the surface moisture of the floor blank, causing inconsistent water separation rates inside and outside the blank, rapid surface water loss and shrinkage, and internal water retention, leading to cracking and deformation, requiring additional humidification.

[0060] Example 2

[0061] This embodiment provides a heat exchange method for a heat exchange device in a floor blank drying kiln, which is implemented based on the embodiment and includes the following steps:

[0062] S1. The dryer 400 disperses and delivers hot gas to the corresponding first distribution chamber 211 and second distribution chamber 311 through the first diverter 260 and the second diverter 360. The gas in the drying chamber 110 undergoes preliminary heat exchange with the hot gas in the first distribution chamber 211 and the second distribution chamber 311 through the second heat exchange fin 320 and the first heat exchange fin 220.

[0063] S2. When the hot gas that has undergone preliminary heat exchange in the first distribution chamber 211 and the second distribution chamber 311 passes through the first air outlet 240 and the second air outlet 340, it undergoes secondary heat exchange in the corresponding first and second channels through the first heat exchange water circuit 230 and the second heat exchange water circuit 330.

[0064] S3. The hot gas that has undergone preliminary heat exchange is reheated and then transported to the drying chamber 110 through the first and second air outlet chambers for circulating heat exchange.

[0065] By using two different heat exchange methods, heat is exchanged simultaneously in the drying chamber 110 and on the floor blank, thus avoiding the problems of slow heating rate and uneven temperature distribution in the drying chamber 110, which could lead to local over-drying or incomplete drying of the floor blank and poor overall moisture content consistency of the blank.

[0066] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

[0067] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A heat exchange device for a floor blank drying kiln, characterized in that The system includes a drying kiln body (100), which has a drying chamber (110) for placing floor blanks inside. One end of the drying chamber (110) has an inlet and outlet for the floor blanks to enter and exit. A first heat exchange mechanism (200) is installed at the other end of the drying chamber (110). A second heat exchange mechanism (300) is installed on both sides of the inner wall of the drying chamber (110). A dryer (400) is installed on the drying kiln body (100) for simultaneously providing hot gas to the first heat exchange mechanism (200) and the second heat exchange mechanism (300). The first heat exchange mechanism (200) has a first heat exchange box (210) connected to the dryer (400). The first heat exchange box (210) has a plurality of first heat exchange fins (220) arranged horizontally along the vertical outer wall. The first heat exchange fins (220) are used to exchange heat with the air in the drying chamber (110). Each adjacent first heat exchange fin (220) has a first air outlet (240) connected to the first heat exchange box (210). The first air outlet (240) is used to transport hot air into the drying chamber (110). A first hot water exchange passage (230) is installed between the plurality of first heat exchange fins (220) and the first air outlet (240). The first hot water exchange passage (230) is used to exchange heat with the hot gas in the first air outlet (240) to achieve secondary heating of the hot gas.

2. A heat exchange device for a floor blank drying kiln as claimed in claim 1, wherein The drying chamber (110) has a return air inlet (111) on the side wall near the inlet and outlet. The return air inlet (111) is connected to an air duct (112) that works with the dryer (400) to form a circulating airflow. A gate is installed in the air duct (112).

3. The heat exchange device for a floor blank drying kiln according to claim 2, characterized in that, A circulating hot water mechanism (500) connected to the first hot water exchange circuit (230) is installed on the main body (100) of the drying kiln. The circulating hot water mechanism (500) includes a water tank. The water tank has a heating chamber (510) connected to the water inlet of the first hot water exchange circuit (230) and a recovery chamber (520) connected to the water outlet of the first hot water exchange circuit (230). A circulating pump for circulating the hot water medium in the first hot water exchange circuit (230) is installed in the heating chamber (510). A heating device is installed in the recovery chamber (520) for heating the hot water medium in the recovery chamber (520). A liquid pump for sending the heated hot water medium to the heating chamber (510) is installed in the recovery chamber (520).

4. The heat exchange device for a floor blank drying kiln according to claim 1, characterized in that, The first heat exchange chamber (210) has a plurality of first distribution chambers (211) arranged at equal intervals along the vertical direction. A first diverter (260) for connecting the dryer (400) and the plurality of first distribution chambers (211) is installed on the side wall of the first heat exchange chamber (210).

5. The heat exchange device for a floor blank drying kiln according to claim 4, characterized in that, The first heat exchange circuit (230) has a first serpentine coil section that cooperates with the first heat exchange fins (220). The first air outlet (240) has multiple first channels that pass through the pipe gap of the first serpentine coil section and communicate with the corresponding first distribution cavity (211). The end of the first air outlet (240) away from the first distribution cavity (211) has a first air outlet cavity that communicates with the multiple first channels. A first guide plate (250) is rotatably installed in the first air outlet cavity. A first drive assembly is installed on the outer wall of the first air outlet (240). The first drive assembly is used to adjust the rotation angle of the first guide plate (250) to achieve airflow compensation for different parts of the floor blank.

6. The heat exchange device for a floor blank drying kiln according to claim 3, characterized in that, The second heat exchange mechanism (300) includes a second heat exchange box (310) located on both sides of the drying chamber (110). The second heat exchange box (310) has a plurality of horizontally arranged second heat exchange fins (320) installed along the vertical outer wall. The second heat exchange fins (320) are used to exchange heat with the air in the drying chamber (110). Each adjacent second heat exchange fin (320) has a second air outlet (340) that communicates with the second heat exchange box (310). The second air outlet (340) is used to transport hot air into the drying chamber (110). A second hot water passage (330) is installed between the plurality of second heat exchange fins (320) and the second air outlet (340). The second hot water passage (330) is used to exchange heat with the hot gas in the second air outlet (340).

7. The heat exchange device for a floor blank drying kiln according to claim 6, characterized in that, The second heat exchange chamber (310) has a plurality of second distribution chambers (311) arranged at equal intervals along the vertical direction. A second diverter (360) for connecting the dryer (400) and the plurality of second distribution chambers (311) is installed on the side wall of the second heat exchange chamber (310).

8. The heat exchange device for a floor blank drying kiln according to claim 7, characterized in that, The drying chamber (110) has a guide surface (115) on the side wall near the inlet and outlet. The second heat exchange circuit (330) has a second serpentine coil part that cooperates with the second heat exchange fins (320) and a condenser tube part (331) that cooperates with the guide surface (115). The second air outlet (340) has multiple second channels that pass through the pipe gap of the second serpentine coil part and communicate with the corresponding second distribution chamber (311). The second air outlet (340) has a second air outlet cavity that communicates with the multiple second channels at the end away from the second distribution cavity (311). A second guide plate (350) is rotatably installed in the second air outlet cavity. A second drive assembly is installed on the outer wall of the second air outlet (340). The second drive assembly is used to adjust the rotation angle of the second guide plate (350) to achieve airflow compensation for different parts of the floor blank.

9. The heat exchange device for a floor blank drying kiln according to claim 8, characterized in that, The inlet of the second heat exchange circuit (330) is connected to the heating chamber (510), and the outlet of the second heat exchange circuit (330) is connected to the recovery chamber (520). The drying chamber (110) and the bottom wall corresponding to the second heat exchange fin (320) and the condenser tube (331) are provided with a collection tank (113) for collecting condensate. The collection tank (113) and the second heat exchange fin (320) are provided with a collection tank (114) for collecting condensate. The second heat exchange circuit (330) has a return section that cooperates with the collection tank (113). The return section and the second heat exchange fin (320) are provided with a third heat exchange fin (332).

10. A heat exchange method for a floor blank drying kiln heat exchange device according to any one of claims 1-9, characterized in that, Includes the following steps: S1. The dryer (400) disperses and transports hot gas through the first diverter (260) and the second diverter (360) to the corresponding first distribution chamber (211) and second distribution chamber (311). The gas in the drying chamber (110) undergoes preliminary heat exchange with the hot gas in the first distribution chamber (211) and the second distribution chamber (311) through the second heat exchange fin (320) and the first heat exchange fin (220). S2. When the hot gas that has undergone preliminary heat exchange in the first distribution chamber (211) and the second distribution chamber (311) passes through the first air outlet (240) and the second air outlet (340), it undergoes secondary heat exchange through the first heat exchange water circuit (230) and the second heat exchange water circuit (330) to the corresponding first and second channels. S3. The hot gas that has undergone preliminary heat exchange is reheated and transported to the drying chamber (110) through the first and second air outlet chambers for circulating heat exchange.

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