A hot air drying system and its working method based on the reuse of condensate waste heat

Abstract

This invention provides a hot air drying system and its operating method based on the reuse of condensate waste heat. The hot air drying system includes a drum assembly, a hot air unit, and a drum drying unit. The drum assembly is used to dry tobacco shreds. The drum drying unit includes a drying device and a detection device. The drying device extends into the drum of the drum assembly and dries the drum. The detection device detects environmental parameters inside the drum and controls the drying device to operate or not operate based on the detection results. The hot air unit includes a heat recovery device, which heats the gas supplied from an external gas supply system before sending it to the drying device. The design of the hot air unit, drum drying unit, and detection device in this invention improves the heat utilization rate of the heating steam, increases the drum drying efficiency, reduces the amount of heating steam used and the drying time, and provides intuitive feedback on the degree of drying.

Description

Technical Field

[0001] This invention relates to the field of cigarette equipment technology, and in particular to a hot air drying system and its working method based on the reuse of waste heat from condensate. Background Technology

[0002] In tobacco production lines, the drum washing equipment used for loosening, rehydrating, feeding, and flavoring processes automatically starts cleaning when producing the next grade after completing the production of a particular grade. As the drum rotates, cleaning water flows from the inlet along the drum wall and out the outlet. The cleaning water carries tobacco flakes, soot, and other debris adhering to the drum wall through the drain outlet of the vibrating trough into the collection box. After cleaning, the drum enters the preheating stage, activating its hot air system and drum wall heating system. The hot air temperature and drum wall temperature are typically around 50°C, with a hot air velocity of 5 m / s. The drum's built-in hot air and heating systems dry the moisture. A large amount of water droplets adhering to the drum wall accumulates at the bottom of the drum due to rotation, gravity, and the water droplet's tendency to accumulate. Some water droplets automatically flow out of the drum outlet, while others sublimate into vapor and are expelled from the drum. Existing drum washing equipment has the following problems during preheating:

[0003] 1. Long preheating time and high energy consumption:

[0004] Since the cleaning water adhering to the inner wall of the drum is mainly dried by hot air and drum heating, the preheating time is as long as 20 minutes. The first 10 minutes are for the hot air to reach the required temperature, and the last 10 minutes are mainly for drying the moisture adhering to the drum wall. The energy source for heating the hot air and drum wall is steam. 10 minutes consumes 100 kg of steam, equivalent to 13.1 kg of standard coal. Based on cleaning twice a day and 250 working days a year, this consumes 6550 kg of standard coal and emits 16768 kg of carbon dioxide.

[0005] 2. The degree of drying is uncontrollable:

[0006] One important reason for preheating the drum is to dry the water droplets adhering to the drum wall. If the water droplets adhering to the drum are not completely dried, it will cause yellow smoke during production, which will seriously affect the stability of product quality. Therefore, in order to avoid quality accidents, the method of extending the preheating time is often used to solve this problem. During preheating, the operator cannot check the water droplets adhering to the drum wall, so the degree of dryness of the drum wall cannot be judged.

[0007] The above problems urgently need to be addressed. Summary of the Invention

[0008] This invention discloses a hot air drying system and its working method based on the reuse of condensate waste heat, aiming to solve the technical problems existing in the prior art.

[0009] The present invention adopts the following technical solution:

[0010] In one aspect, the present invention provides a hot air drying system based on the reuse of condensate waste heat, comprising a drum assembly, a hot air assembly, and a drum drying assembly; the drum assembly is used to process tobacco shreds; the drum drying assembly includes a drying device and a detection device; the drying device can extend into the drum of the drum assembly and dry the drum; the detection device is used to detect environmental parameters inside the drum and control the drying device to operate or not operate based on the detection results; the hot air assembly includes a heat recovery device; the heat recovery device is used to heat the gas supplied by the external gas supply system and send it to the drying assembly.

[0011] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the drying device includes a telescopic device and a blowing assembly; the blowing assembly is installed at the telescopic end of the telescopic device and is connected to the heat recovery device, and the blowing assembly includes a first blowing assembly and a second blowing assembly; the air outlet direction of the first blowing assembly is towards the bottom surface and side wall of the drum; the air outlet direction of the second blowing assembly is towards the bottom of the side wall of the drum.

[0012] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the telescopic device extends along the axis of the drum.

[0013] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the detection device is installed at the telescopic end of the telescopic device.

[0014] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the first blowing component is a rotating nozzle and the second blowing component is an arc-shaped air knife; the first blowing component and the second blowing component are arranged sequentially along the telescopic direction of the telescopic device, and the first blowing component is closer to the end of the telescopic end of the telescopic device.

[0015] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the first blowing assembly includes a rotating nozzle and a regulating valve; the rotating nozzle is connected to the heat recovery device and the air intake is controlled by the regulating valve.

[0016] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the air outlet of the second blowing component is an arc-shaped structure arranged circumferentially along the side wall of the drum and parallel to the side wall of the drum.

[0017] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the second blowing assembly includes a second air knife, a connecting pipe and a bracket; the second air knife is installed on the telescopic end of the telescopic device through the bracket, and the second air knife is connected to the heat recovery device through the connecting pipe; the bracket is hinged to the second air knife and / or the telescopic end of the telescopic device to adjust the air outlet direction of the second air knife.

[0018] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the angle between the air outlet direction of the second air knife and the side wall of the drum is B, where 70°≤B≤80°.

[0019] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the central angle corresponding to the arc length of the air outlet of the second blowing component is greater than or equal to 90°.

[0020] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the drum drying device further includes a turntable device; the telescopic device is installed on the turntable device and can drive the telescopic device to move so that the blowing assembly moves closer to or away from the drum sidewall.

[0021] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the drum drying device further includes a first telescopic control element and a second telescopic control element; the telescopic control element and the second telescopic control element are respectively electrically connected to the telescopic device, and the first telescopic control element and the second telescopic control element control the extension and retraction of the telescopic device.

[0022] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the telescopic control element is used to control the telescopic device to retract when the telescopic device extends to the upper stop point; the second telescopic control element is used to control the telescopic device to extend when the telescopic device retracts to the drum inlet.

[0023] In the hot air drying system based on the reuse of condensate waste heat of the present invention, both the first telescopic control element and the second telescopic control element are proximity switches.

[0024] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the telescopic device is an electric telescopic rod.

[0025] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the detection device includes a mist detection element and a humidity detection element; if the measured value of the environmental parameter measured by the detection device is greater than a preset value, the drying device continues to work; if the measured value of the environmental parameter measured by the detection device is less than or equal to the preset value, the drying device stops working.

[0026] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the mist detection element is used to measure the mist value; the humidity detection element is used to measure the humidity value.

[0027] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the heat recovery device includes a condensate recovery tank and a heat exchanger; the heat exchanger is disposed in the condensate recovery tank and is provided with an air inlet and an air outlet; the air inlet is connected to the air supply system; the air outlet is connected to the drying equipment.

[0028] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the air outlet is connected to the drying equipment through an air outlet pipe; a third valve is provided on the air outlet pipe.

[0029] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the heat exchanger includes a gas distribution pipe, a gas collecting pipe and a heat exchange tube; the gas distribution pipe is provided with the air inlet; the gas collecting pipe is provided with the air outlet; and the heat exchange tube is connected to the gas distribution pipe and the gas collecting pipe.

[0030] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the heat exchange tube is a finned tube and the fins are spiral fins.

[0031] In the hot air drying system based on the reuse of condensate waste heat of the present invention, a baffle is provided inside the air collecting pipe.

[0032] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the baffle plate is perpendicular to the length of the pipe and has ventilation holes.

[0033] In the hot air drying system based on the reuse of condensate waste heat of the present invention, a safety valve is installed on the air collecting pipe.

[0034] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the top of the gas distribution pipe and the gas collection pipe are connected by a first unidirectional conduction component to achieve unidirectional conduction from the gas distribution pipe to the gas collection pipe; the bottom of the gas distribution pipe and the gas collection pipe are connected by a second unidirectional conduction component to achieve unidirectional conduction from the gas collection pipe to the gas distribution pipe.

[0035] In the hot air drying system based on the reuse of condensate waste heat of the present invention, both the first unidirectional flow component and the second unidirectional flow component include a flow guide pipe and a one-way valve. The flow guide pipe is connected to the gas distribution pipe and the gas collection pipe, and a one-way valve is provided on the flow guide pipe.

[0036] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the condensate recovery tank is provided with a feed inlet and an automatic drain valve.

[0037] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the feed inlet is connected to a feed pipe; a one-way valve and a second valve are provided on the feed pipe.

[0038] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the heat recovery device further includes a drain pump, a liquid level measuring element, a temperature measuring element, and a pressure measuring element; the liquid level measuring element, the temperature measuring element, and the pressure measuring element are respectively installed in the condensate recovery tank and are used to detect the liquid temperature, liquid level, and tank pressure in the condensate recovery tank; the inlet of the drain pump is connected to the condensate recovery tank, and its operation is determined based on the measurement values ​​of the liquid level measuring element, the temperature measuring element, or the pressure measuring element.

[0039] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the drain pump is a pipeline pump.

[0040] In the hot air drying system based on the reuse of condensate waste heat of the present invention, a one-way valve is provided at the outlet of the drain pump.

[0041] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the air supply device includes an air compressor, a first valve and a filter pressure reducing valve; the gas output by the air compressor passes through the first valve and the filter pressure reducing valve in sequence and is delivered to the heat recovery device.

[0042] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the drum of the drum device has an inlet for the drying equipment to extend into; the inlet is opened or closed by the movable cover plate.

[0043] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the movable cover plate includes a cover plate and a moving device; the moving device is installed on the roller and is used to drive the cover plate to seal or open the inlet.

[0044] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the mobile device includes a cylinder, a first magnetic ring induction switch and a second magnetic ring induction switch; the cylinder is connected to the cover plate; the first magnetic ring induction switch and the second magnetic ring induction switch are respectively used to cut off the air supply to the cylinder when the cylinder drives the cover plate to the open position and the closed position.

[0045] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the cylinder is a rodless cylinder.

[0046] In the hot air drying system based on the reuse of condensate waste heat of the present invention, when the first magnetic ring induction switch and the second magnetic ring induction switch are triggered, the cylinder air supply valve is controlled to close.

[0047] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the hot air drying system based on the reuse of condensate waste heat further includes a pressure control device; the pressure control device is connected to the drum device and is used to control the pressure inside the drum device.

[0048] In the hot air drying system based on the reuse of condensate waste heat of the present invention, the pressure control device includes an induced draft fan and a second pressure measuring element; the second pressure measuring element is used to measure the pressure inside the drum device; the air inlet of the induced draft fan is connected to the drum device.

[0049] On the other hand, the present invention provides a method for operating a hot air drying system based on the reuse of condensate waste heat, which includes the following steps:

[0050] The device is started, the hot air device is started, the cover of the drum device is opened, the drum drying device is started, and the drying equipment and testing equipment are inserted into the drum.

[0051] Drying begins, the hot air device blows air into the drying equipment, the drying equipment continues to move into the drum, and at the same time the detection equipment detects the environmental parameters inside the drum and obtains the detection values.

[0052] The result is determined by comparing the measured value at the point where the drying equipment extends to its upper limit with the preset value.

[0053] If the detected value is greater than the preset value, the drying equipment will retract and continue to dry the drum.

[0054] If the detected value is less than or equal to the preset value, the hot air device stops supplying air, the drying equipment retracts, the cover closes, and the drying process ends.

[0055] In the working method of the present invention, after the step of retracting the drying device and continuing to dry the drum, the following steps are also included.

[0056] For the second test, the drying equipment retracts to the roller inlet position, and the measured value at this point is compared with the preset value.

[0057] If the detected value is greater than the preset value, the turntable will move the drying equipment toward the side wall of the drum, and the drying equipment will extend to continue drying until the detected value is less than the preset value.

[0058] In the working method of the present invention, the result judgment step further includes,

[0059] If the fluctuation range between the detected values ​​exceeds ±20%, an alarm will be issued.

[0060] The technical solution adopted in this invention can achieve the following beneficial effects: The hot air drying system based on the reuse of condensate waste heat in this invention is based on the setting of a hot air device and a drum drying device. The heat recovery device of the hot air device can cool the heating steam to recover the heat in the condensate and heat the air to supply the drying equipment in the drum drying device. This improves the heat utilization rate of the heating steam. Furthermore, since the drum drying device extends into the drum for drying, the drum drying efficiency is improved, and the amount of heating steam and drying time are reduced. In addition, the detection equipment can detect the environmental parameters inside the drum, which can provide intuitive feedback on the degree of drying and control the degree of drying. Attached Figure Description

[0061] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0062] Figure 1 This is a schematic diagram of the hot air drying system based on the reuse of condensate waste heat according to the present invention.

[0063] Figure 2 This is a schematic diagram of the structure of the drum drying device of the hot air drying system based on the reuse of condensate waste heat of the present invention.

[0064] Figure 3 This is a schematic diagram of the blowing component of the hot air drying system based on the reuse of condensate waste heat according to the present invention.

[0065] Figure 4 This is a schematic diagram of the structure of the second blowing component of the hot air drying system based on the reuse of condensate waste heat according to the present invention;

[0066] Figure 5 This is a schematic diagram of the hot air device of the hot air drying system based on the reuse of condensate waste heat of the present invention.

[0067] Figure 6 This is a schematic diagram of the heat exchange tube structure of the hot air drying system based on the reuse of condensate waste heat according to the present invention.

[0068] Figure 7 This is a schematic diagram of the baffle plate in the hot air drying system based on the reuse of condensate waste heat according to the present invention.

[0069] Figure 8 This is a schematic diagram of the drum device of the hot air drying system based on the reuse of condensate waste heat according to the present invention.

[0070] Figure 9 This is a schematic diagram of the movable cover plate of the hot air drying system based on the reuse of condensate waste heat according to the present invention.

[0071] Explanation of reference numerals in the attached figures:

[0072] 1. Roller assembly; 11. Roller; 12. Movable cover plate; 121. Cover plate; 122. Movable equipment; 1221. Cylinder; 1222. First magnetic ring induction switch; 1223. Second magnetic ring induction switch; 2. Hot air device; 21. Heat recovery device; 211. Condensate recovery tank; 2111. Inlet; 2112. Automatic vent valve; 2113. Inlet pipe; 2114. One-way valve; 2115. Second valve; 212. Heat exchanger; 2121. Air inlet; 2122. Air outlet; 2123. Gas distribution pipe; 2124. Gas collecting pipe; 2125. Heat exchanger tube; 2126. Baffle plate; 21261. Vent hole; 2127. Safety valve; 2128. First one-way conduction assembly; 2129. Second one-way conduction assembly; 213. Drain pump; 2 14. Liquid level measuring element; 215. Temperature measuring element; 216. Pressure measuring element; 22. Air supply device; 221. Air compressor; 222. First valve; 223. Filter pressure reducing valve; 3. Drum drying device; 31. Drying equipment; 311. Telescopic device; 312. Air blowing assembly; 3121. First air blowing assembly; 31211. Rotary nozzle; 31212. Regulating valve; 3122. Second air blowing assembly; 31221. Second air knife; 31222. Connecting pipe; 31223. Support; 32. Detection equipment; 321. Mist detection element; 322. Humidity detection element; 33. First telescopic control element; 34. Second telescopic control element; 35. Turntable equipment; 4. Pressure control device; 41. Exhaust fan; 42. Second pressure measuring element. Detailed Implementation

[0073] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0074] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Multiple designations indicate a quantity greater than or equal to two.

[0075] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0076] To address the problems existing in the prior art, this application provides a hot air drying system based on the reuse of condensate waste heat, such as... Figure 1 As shown, it includes a drum device 1, a hot air device 2, and a drum drying device 3; the drum device 1 is used to process tobacco shreds (such as heating and humidifying tobacco shreds (tobacco sheets), adding flavoring and ingredients); the drum drying device 3 includes a drying device 31 and a detection device 32; the drying device 31 can extend into the drum 11 of the drum device 1 and dry the drum 11; the detection device 32 is used to detect the environmental parameters inside the drum 11 and control the drying device 31 to work or not work based on the detection results; the hot air device 2 includes a heat recovery device 21; the heat recovery device 21 is used to heat the gas (such as compressed air) supplied by the external air supply system and send it to the drying device 31, wherein the external air supply system can be an external pressure gas system or an air compressor.

[0077] The present invention relates to a hot air drying system based on the reuse of condensate waste heat, which includes a hot air device and a drum drying device. The heat recovery device of the hot air device can cool the heating steam (the water vapor from the heating drum and the drum wall mentioned in the background art) to recover heat from the condensate, and then heat the air to supply the drying equipment in the drum drying device. This improves the heat utilization rate of the heating steam. Furthermore, since the drum drying device extends into the drum for drying, it improves the drum drying efficiency, reduces the drying time, and reduces the amount of heating steam used. In addition, the detection device can detect the environmental parameters inside the drum, providing intuitive feedback on the degree of drying and allowing for control of the drying degree.

[0078] In some embodiments, such as Figure 1 and 2As shown, the drying device 31 includes a telescopic device 311 and a blower assembly 312; the blower assembly 312 is installed at the telescopic end of the telescopic device 311 and is connected to the heat recovery device 21. The blower assembly 312 includes a first blower assembly 3121 and a second blower assembly 3122; the air outlet direction of the first blower assembly 3121 is towards the bottom surface and side wall of the roller 11; the air outlet direction of the second blower assembly 3122 is towards the bottom of the side wall of the roller 11. Specifically, the first blowing assembly 3121 and the second blowing assembly 3122 are connected to the heat recovery device 21. For example, the telescopic rod of the telescopic device 311 is set as a hollow structure, and the first blowing assembly 3121 and the second blowing assembly 3122 are connected to the hollow structure of the telescopic rod. The hollow structure is connected to the heat recovery device 21. Based on the arrangement of the first blowing assembly 3121 and the second blowing assembly 3122, the side wall and bottom surface of the drum 11 are dried, resulting in higher drying efficiency. The first blowing assembly 3121 can dry the moisture on one hand and blow away the water droplets on the side wall on the other hand, which accumulate at the bottom of the side wall. The second blowing assembly 3122 further dries the accumulated water droplets. Based on the extension of the telescopic device 311 into the drum for drying, the drying efficiency of the drum is improved and the amount of heating steam used is reduced. Furthermore, based on the detection equipment to detect the environmental parameters inside the drum, the degree of drying can be intuitively fed back to control the degree of drying.

[0079] Preferably, the telescopic device 31 extends along the axis of the roller 11. Based on this configuration, during the extension and retraction of the telescopic device 31, the distance between the blowing assembly 312 and the inner wall of the roller 11 is consistent, resulting in more uniform drying of the inner wall of the roller 11.

[0080] Preferably, the detection device 32 is installed at the telescopic end of the telescopic device 311. Since the detection device 32 can move under the drive of the telescopic device 311, the environmental parameters at different positions inside the roller 11 can be measured during the movement. The parameters at different positions can be compared to determine whether there are stubborn water stains. If the fluctuation range between the detection values ​​exceeds ±20% (fluctuation between high and low values), it can be determined that there are stubborn water stains that need to be cleaned manually. This can effectively avoid incomplete drying and water stain residue, and can also reduce the drying time.

[0081] In some embodiments, such as Figure 2As shown, the first blowing assembly 3121 is a rotating nozzle, and the second blowing assembly 3122 is an arc-shaped air knife. The first blowing assembly 3121 and the second blowing assembly 3122 are arranged sequentially along the telescopic direction of the telescopic device 311, and the first blowing assembly 3121 is closer to the end of the telescopic end of the telescopic device 311 (preferably, the two are 30cm apart). That is, when performing the drying operation, the first blowing assembly 3121 first dries the side wall and bottom surface of the roller 11, and then the second blowing assembly 3122 dries the bottom of the side wall of the roller 11. The roller 11 is a rotating cylinder. Due to the surface tension of water, the water adhering to the inner wall of the roller 11 after cleaning will gather into water droplets, and as the roller 11 rotates, it will flow down the inner wall of the roller to the lower part (bottom of the roller). The hot air ejected by the first air-blowing assembly 3121 can dry the side walls and bottom surface of the drum (i.e., the blown air is roughly conical), especially at the base of the rakes installed on the inner wall of the drum; it can also accelerate the flow of undried water droplets adhering to the inner wall of the drum downwards or disperse the water droplets, thus accelerating the drying effect. At the same time, after the water droplets accumulate at the bottom of the drum, the drying efficiency is accelerated by the action of the second air-blowing assembly 3122; the second air-blowing assembly 3122 is set as an arc-shaped air knife, and the arc-shaped air knife sprayed out forms an "air shovel". On the one hand, it blows the accumulated water droplets forward and forms a water film, and on the other hand, it superimposes with the hot air ejected by the first air-blowing assembly 3121 to quickly dry the water droplets adhering to the inner wall of the drum. The combination of these two forms of hot air can improve the drying efficiency by about 50%.

[0082] In some embodiments, the air outlet of the second blowing assembly 3122 is an arc-shaped structure arranged circumferentially along the side wall of the roller 11 and parallel to the side wall of the roller 11. In this case, the air outlet of the second blowing assembly 3122 is arranged parallel to the inner wall of the roller 11, so the distance between the air outlet and the inner wall of the roller 11 is equal. The resulting "wind shovel" has a better effect on blowing water droplets, the blowing force on the water droplets is uniform, and the consistency of the movement direction of the water droplets when they are blown is improved.

[0083] In some embodiments, such as Figure 2 and 3 As shown, the first air blowing assembly 3121 includes a rotating nozzle 31211 and a regulating valve 31212; the rotating nozzle 31211 is connected to the heat recovery device 21 and the air intake is controlled by the regulating valve 31212; the rotating nozzle can be "CHIQIANG", with a rotation angle of 65°, 304 material, internal thread, inner diameter of 1 inch, pressure of 8-10Kg, and 360° automatic rotating nozzle, or other nozzles on the market that can dry the bottom and side walls of the roller 11.

[0084] Preferably, the central angle corresponding to the arc length of the air outlet of the second blowing component 3122 is greater than or equal to 90°, preferably 90°. Based on the limitation of the length of the air outlet of the second blowing component 3122, it is ensured that the water droplets accumulated at the bottom of the side wall of the roller 11 are blown away. Within this range, it can be used in conjunction with the rotation of the roller 11. The rotation of the roller 11 is conducive to the accumulation of water droplets.

[0085] In some embodiments, such as Figure 2-4 As shown, the second air-blowing assembly 3122 includes a second air blade 31221, a connecting pipe 31222, and a bracket 31223. The second air blade 31221 is mounted on the telescopic end of the telescopic device 311 via the bracket 31223, and the second air blade 31221 is connected to the heat recovery device 21 via the connecting pipe 31222. The bracket 31223 is hinged to the second air blade 31221 and / or the telescopic end of the telescopic device 311 to adjust the air outlet direction of the second air blade 31221 (the orientation of the air outlet 312211). Specifically, the connecting pipe 31222 is configured as a flexible hose to accommodate the angle adjustment of the second air blade 31221. Preferably, there are two brackets 31223 to provide stable support for the second air blade 31221.

[0086] Preferably, the angle between the air outlet direction of the second air knife 31221 and the side wall of the drum 11 is B, 70°≤B≤80°; within this angle range, the blowing effect on the water droplets accumulated at the bottom of the drum 11 is the best, and the water droplets can be blown away to better cooperate with the first air blowing assembly 3121 for drying.

[0087] In some embodiments, such as Figure 1 and 2 As shown, the drum drying device 3 also includes a turntable device 35 (optionally a YDLX / Luxing hollow rotary platform, such as model LXRA60); a telescopic device 311 is installed on the turntable device 35, and the turntable device 311 can be moved to allow the blowing assembly 32 to move closer to or further away from the side wall of the drum 11. Specifically, the turntable device 35 drives the telescopic device 311 and the blowing assembly 312 to swing towards both sides of the telescopic device 311, thereby reducing the distance between the blowing assembly 312 and the inner wall of the drum 11, thus strengthening the drying force on the inner wall of the drum 11 and improving the drying efficiency. Preferably, during the extension and retraction of the telescopic device 311, the turntable device 35 simultaneously drives the telescopic device 311 to swing, thereby obtaining a better drying effect.

[0088] In some embodiments, such as Figure 1 and 2As shown, the drum drying device 3 also includes a first telescopic control element 33 and a second telescopic control element 34. The first and second telescopic control elements 33 and 34 are electrically connected to the telescopic device 311, respectively, and control the extension and retraction of the telescopic device 311. Specifically, the first telescopic control element 33 controls the telescopic device 311 to retract when it extends to its upper limit; the second telescopic control element 34 controls the telescopic device 311 to extend when it retracts to the inlet of the drum 11. Both the first and second telescopic control elements 33 and 34 are proximity switches, arranged along the telescopic path of the telescopic device 311. The telescopic device 311 is an electric telescopic rod, and the drive motor is a forward and reverse motor. When the telescopic device 311 extends and triggers the first telescopic control element 33, the drive motor reverses, and the telescopic device 31 retracts; when the telescopic device 311 retracts to the inlet of the drum 11, the second telescopic control element 34 is triggered, the drive motor reverses, and the telescopic device 311 extends. If the test result is satisfactory, the second telescopic control element 34 will not extend further even if it is triggered.

[0089] Furthermore, the first telescopic control element 33 and the second telescopic control element 34 can also be connected to a counter to record the number of times they are triggered, and thus record the number of times the inner wall of the roller 11 is dried. Normally, three times (each time is counted as one time when the telescopic device 311 is fully extended or retracted to the inlet of the roller 11) are enough to completely dry the water stains on the inner wall of the roller 11. To ensure the drying effect, it can be set to four times.

[0090] In some embodiments, such as Figure 2 As shown, the detection device 32 includes a fog detection element 321 (such as a BMW E87 fog sensor) and a humidity detection element 322 (such as a DK-3000-WS (high temperature and waterproof) thermo-hygrometer).

[0091] If the measured value of the environmental parameter measured by the detection device 32 is greater than the preset value, the drying device 31 will continue to work;

[0092] If the measured value of the environmental parameter measured by the detection device 32 is less than or equal to the preset value, the drying device 31 will stop working.

[0093] Among them, the fog detection element 321 is used to measure the fog value; the humidity detection element 322 is used to measure the humidity value; the preset value is the environmental parameter inside the roller 11 after the drying is qualified, and the specific value is determined according to the working conditions.

[0094] In some embodiments, such as Figure 5As shown, the heat recovery device 21 includes a condensate recovery tank 211 and a heat exchanger 212. The heat exchanger 212 is disposed inside the condensate recovery tank 211 and is provided with an air inlet 2121 and an air outlet 2122. The air inlet 2121 is connected to an external air supply system; the air outlet 2122 is connected to the drying equipment 31. The condensate recovery tank 211 is used to recover condensate formed by heating steam, and the heat exchanger 212 is used to heat the gas used by the drying equipment 31 with the waste heat of the condensate. Preferably, the air outlet 2122 is connected to the drying equipment 31 through an air outlet pipe. A third valve 224 is provided on the air outlet pipe, and the supply of air to the drying equipment 31 is controlled based on the setting of the third valve 224. The third valve 224 can be selected as a pneumatic diaphragm valve.

[0095] In some embodiments, such as Figure 5 and 6 As shown, the heat exchanger 212 includes a gas distribution pipe 2123, a gas collecting pipe 2124, and a heat exchange tube 2125. The gas distribution pipe 2124 is provided with an air inlet 2121; the gas collecting pipe 2124 is provided with an air outlet 2122; the heat exchange tube 2125 connects the gas distribution pipe 2123 and the gas collecting pipe 2124. The gas distribution pipe 2123 and the gas collecting pipe 2124 buffer the inlet and outlet air, so that when multiple heat exchange tubes 2125 are provided, the gas flow rate in each heat exchange tube 2125 is uniform, thereby improving the heat exchange effect. When multiple heat exchange tubes 2125 are provided, the cross-sectional area of ​​the gas distribution pipe 2123 and the gas collecting pipe 2124 is equal to the sum of the cross-sectional areas of the multiple heat exchange tubes 2125, thereby reducing the gas flow resistance.

[0096] Preferably, the heat exchange tube 2125 is a finned tube with spiral fins, which increases the heat exchange area and further improves the heat exchange efficiency.

[0097] Preferred, such as Figure 6 and 7 As shown, a baffle plate 2126 is provided inside the gas collecting pipe 2124. The baffle plate 2126 turbulents the gas in the gas collecting pipe 2124. The baffle plate 2126 is positioned between the heat exchange pipe 2125 and the gas outlet 2122. Thus, the gas after heat exchange through the heat exchange pipe 2125 is mixed and turbulent before being discharged, resulting in a more stable gas temperature and more uniform heat distribution. Specifically, the baffle plate 2126 is perpendicular to the pipe length direction; multiple baffle plates 2126 are provided along the pipe length direction; vent holes 21261 are provided. Preferably, there are multiple vent holes 21261, which are evenly distributed; more preferably, the multiple vent holes 21261 are roughly arranged in a circle; even more preferably, the multiple vent holes 21261 have different diameters. This different diameter arrangement enhances the turbulence effect and improves the uniformity of heat distribution.

[0098] In some embodiments, such as Figure 6As shown, a safety valve 2127 is installed on the gas collection pipe 2124 to release pressure when there is overpressure. The pressure released by the safety valve is 1.2 times the operating pressure.

[0099] In some embodiments, such as Figure 6 As shown, the tops of the air distribution pipe 2123 and the air collection pipe 2124 are connected by a first one-way flow assembly 2128 to achieve one-way flow from the air distribution pipe 2123 to the air collection pipe 2124; the bottoms of the air distribution pipe 2123 and the air collection pipe 2124 are connected by a second one-way flow assembly 2129 to achieve one-way flow from the air collection pipe 2124 to the air distribution pipe 2123; when there is no hot air output, or when the compressed air is just starting to be heated, a "air lock" phenomenon may occur due to the presence of low-temperature air in the air collection pipe 2124. By setting the first one-way flow assembly 2128 and the second one-way flow assembly 2129, the "air lock" phenomenon can be avoided, so that heat exchange can proceed normally.

[0100] Specifically, both the first unidirectional flow assembly 2128 and the second unidirectional flow assembly 2129 include a flow guide pipe and a one-way valve. The flow guide pipe is connected to the gas distribution pipe 2123 and the gas collection pipe 2124, and a one-way valve is provided on the flow guide pipe.

[0101] In some embodiments, such as Figure 5 As shown, the condensate recovery tank 211 is equipped with a feed inlet 2111 and an automatic drain valve 2112. The feed inlet 2111 is connected to a feed pipe 2113; the feed pipe 2113 is equipped with a one-way valve 2114 and a second valve 2115.

[0102] In some embodiments, such as Figure 5 As shown, the heat recovery device 21 also includes a drain pump 213, a liquid level measuring element 214, a temperature measuring element 215, and a pressure measuring element 216. The liquid level measuring element 214, the temperature measuring element 215, and the pressure measuring element 216 are respectively installed in the condensate recovery tank 211 to detect the liquid temperature, liquid level, and tank pressure in the condensate recovery tank 211. The drain pump 213 is connected to the condensate recovery tank 211 at its inlet and determines whether to work based on the measured values ​​of the liquid level measuring element 214, the temperature measuring element 215, or the pressure measuring element 216. When the detected value is higher than the preset value, the drain pump 213 works. Specifically, the drain pump 213 is a high-temperature resistant pipeline pump; a one-way valve is installed at the outlet of the drain pump 213; when the drain pump 213 is started, the condensate in the condensate recovery tank 211 is discharged to the outside, such as into a closed condensate system; thereby reducing the amount of condensate in the condensate recovery tank 211, thereby reducing the temperature of the hot air after heat exchange. By controlling the amount of high-temperature condensate, the purpose of controlling the temperature of the hot air is achieved.

[0103] In some embodiments, such as Figure 5As shown, the hot air drying system based on the reuse of condensate waste heat also includes an air supply device 22, which is used to supply air to the heat recovery device 21 and includes a first valve 222 and a filter pressure reducing valve 223; the gas supplied from the outside passes through the first valve 222 and the filter pressure reducing valve 223 in sequence and is delivered to the heat recovery device 21. The gas supplied from the outside can be provided by an air compressor 221.

[0104] In some embodiments, such as Figure 8 As shown in Figures 9 and 10, the roller 11 of the roller device 1 has an inlet for the drying equipment 31 to extend into; the inlet is opened or closed by a movable cover plate 12.

[0105] Specifically, the movable cover 12 includes a cover 121 and a moving device 122; the moving device 122 is mounted on the roller 11 and is used to drive the cover 121 to seal or open the inlet. The moving device 122 includes a cylinder 1221 (such as a rodless cylinder, in which case the cylinder 1221 drives the cover 121 to move in a direction parallel to the inlet), a first magnetic ring induction switch 1222, and a second magnetic ring induction switch 1223; the cylinder 1221 is connected to the cover 121; specifically, when the first magnetic ring induction switch 1222 and the second magnetic ring induction switch 1223 are triggered, the air supply valve of the cylinder 1221 is closed.

[0106] In some embodiments, such as Figure 1 and 8 As shown, the hot air drying system based on the reuse of condensate waste heat also includes a pressure control device 4; the pressure control device 4 is connected to the drum assembly 1 and is used to control the pressure inside the drum assembly 1. Specifically, the pressure control device 4 includes an induced draft fan 41 and a second pressure measuring element 42; the second pressure measuring element 42 is used to measure the pressure inside the drum assembly 1; the air inlet of the induced draft fan 41 is connected to the drum assembly 1, and by selecting an induced draft fan 41 driven by a variable frequency motor, when the drying equipment 31 is working, the amount of air entering the drum 11 increases, the pressure inside the drum rises, and the speed of the variable frequency motor increases to discharge the gas inside the drum 11 and maintain the pressure inside the drum 11.

[0107] In some embodiments, such as Figure 1 As shown, the hot air drying system based on the reuse of condensate waste heat also includes a control device 5. The control device 5 is connected to the drum device 1, the hot air device 2 and the drum drying device 3 by signal, and controls the drying device 31 and the air supply device 22 to work or stop and reset based on the measured value of the detection device 32.

[0108] In some embodiments, such as Figure 1As shown, the hot air drying system based on the reuse of condensate waste heat also includes a camera 6. The camera 6 (such as a miniature camera) is set at the telescopic end of the telescopic device 311 of the drying device 31 to observe the drying condition inside the drum 11 when the drying device 31 dries the inside of the drum. In particular, when the detection device 32 issues an alarm, the camera 6 takes pictures of the inner wall of the drum 11 to make a preliminary judgment on whether it is a false alarm.

[0109] A method for operating the above-mentioned hot air drying system based on the reuse of condensate waste heat includes the following steps S1-3:

[0110] Step S1: The device is started, the hot air device 2 is started, the cover plate 121 of the drum device 1 is opened, the drum drying device 3 is started, and the drying equipment 31 and the testing equipment 32 are inserted into the drum 11.

[0111] Step S2: Drying begins. Hot air device 2 sends air to drying equipment 31. Drying equipment 31 continues to move into drum 11. At the same time, detection device 32 detects environmental parameters inside drum 11 and obtains detection values.

[0112] Step S3, result judgment: When the drying device 31 extends to the upper stop point, compare the detected value at this time with the preset value.

[0113] If the detected value is greater than the preset value, the drying device 31 retracts and continues to dry the drum 11;

[0114] If the detected value is less than or equal to the preset value, the hot air device 2 stops supplying air, the drying equipment 31 retracts, the cover plate 121 closes, and the drying process ends.

[0115] By using high-temperature, high-speed hot air to dry water droplets adhering to the inner wall of the drum, the preheating time of the equipment is reduced from 20 minutes to 10 minutes, shortening the idle time of the front and rear equipment, improving work efficiency, reducing steam consumption by 100 kg / cycle, and reducing carbon dioxide emissions by 16,768 kg per year.

[0116] In some embodiments, after the step of retracting the drying device 31 and continuing to dry the roller 11, the following steps are further included.

[0117] For the second test, the drying equipment 31 retracts to the inlet position of the drum 11, and the detection value of the testing equipment 32 at this time is compared with the preset value.

[0118] If the detected value is greater than the preset value, the turntable device 35 drives the drying device 31 to move toward the side wall of the roller 11, and the drying device 31 extends to continue drying until the detected value of the detection device 32 is less than the preset value.

[0119] In some embodiments, the result determination step further includes,

[0120] If the fluctuation range between the test values ​​exceeds ±20%, an alarm will be issued. By comparing the test values ​​from multiple locations, it can be determined whether there are stubborn water stains. If the fluctuation range between the test values ​​exceeds ±20%, it can be determined that there are stubborn water stains, an alarm will be issued, and manual cleaning will be arranged. This can effectively avoid incomplete drying and water stain residue, and can also reduce drying time.

[0121] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A hot air drying system based on the reuse of condensate waste heat, characterized in that, Includes a drum unit, a hot air unit, and a drum drying unit; The roller device is used to process tobacco shreds; The drum drying device includes drying equipment and testing equipment; The drying device can extend into the drum of the drum assembly and dry the drum; The detection device is used to detect environmental parameters inside the drum and control the drying equipment to work or not work based on the detection results; The hot air device includes a heat recovery device; the heat recovery device is used to heat the gas supplied by the external gas supply system and then send it to the drying equipment; the drying equipment includes a telescopic device and a blowing assembly. The blowing assembly is installed on the telescopic end of the telescopic device and is connected to the heat recovery device. The blowing assembly includes a first blowing assembly and a second blowing assembly. The air outlet direction of the first blowing assembly is towards the bottom surface and side wall of the roller; The air outlet direction of the second blowing assembly is towards the bottom of the roller sidewall; The detection device is installed on the telescopic end of the telescopic device; The first blowing component is a rotating nozzle, and the second blowing component is an arc-shaped air knife; the first blowing component and the second blowing component are arranged sequentially along the telescopic direction of the telescopic device, and the first blowing component is closer to the end of the telescopic device's telescopic end; The air outlet of the second blowing assembly is an arc-shaped structure arranged circumferentially along the side wall of the roller and parallel to the side wall of the roller.

2. The hot air drying system based on the reuse of condensate waste heat according to claim 1, characterized in that, The drum drying device also includes a turntable device; The telescopic device is installed on the turntable and can be driven to move so that the blowing assembly moves closer to or away from the roller sidewall.

3. The hot air drying system based on the reuse of condensate waste heat according to claim 1, characterized in that, The detection equipment includes a fog detection element and a humidity detection element; If the measured value of the environmental parameter measured by the detection device is greater than the preset value, the drying device continues to work; If the measured value of the environmental parameter measured by the detection device is less than or equal to the preset value, the drying device shall stop working.

4. The hot air drying system based on the reuse of condensate waste heat according to claim 1, characterized in that, The heat recovery device includes a condensate recovery tank and a heat exchanger; The heat exchanger is installed inside the condensate recovery tank and is equipped with an air inlet and an air outlet. The air inlet is connected to the air supply system; The air outlet is connected to the drying device.

5. The hot air drying system based on the reuse of condensate waste heat according to claim 4, characterized in that, The heat exchanger includes a gas distribution pipe, a gas collecting pipe, and a heat exchange tube; The air inlet is provided on the air distribution pipe; The gas collection pipe is provided with the gas outlet; The heat exchange tube is connected to the gas distribution pipe and the gas collection pipe.

6. The hot air drying system based on the reuse of condensate waste heat according to claim 1, characterized in that, The hot air drying system based on the reuse of condensate waste heat also includes a pressure control device. The pressure control device is connected to the roller assembly and is used to control the pressure inside the roller assembly.

7. A method for operating the hot air drying system based on the reuse of condensate waste heat as described in any one of claims 1-6, characterized in that, Includes the following steps: The device is started, the hot air device is started, the drum drying device is started, and the drying equipment and testing equipment are inserted into the drum; Drying begins, the hot air device blows air into the drying equipment, the drying equipment continues to move into the drum, and at the same time the detection equipment detects the environmental parameters inside the drum and obtains the detection values. The result is determined by comparing the measured value at the point where the drying equipment extends to its upper limit with the preset value. If the detected value is greater than the preset value, the drying equipment will retract and continue to dry the drum. If the detected value is less than or equal to the preset value, the hot air device stops supplying air, the drying equipment retracts, and the drying process ends.

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