Airflow wire drying machine with cooling and humidifying feeding functions and operation method thereof

Abstract

The present invention discloses an airflow wire drying machine with cooling and humidifying and feeding functions, comprising a hot air generating unit (N1), a feeding unit (N2), an airflow wire drying unit (N3), a fixed bed unit (N4), an exhaust unit (N5), a discharging unit (N6), a cooling unit (N7), and a humidifying and feeding unit (N8); the hot air generating unit (N1) and the feeding unit (N2) are located upstream of the airflow wire drying unit (N3), the fixed bed unit (N4) is located downstream of the airflow wire drying unit (N3), the exhaust unit (N5) is located at the top of the fixed bed unit (N4), the cooling unit (N7) and the humidifying and feeding unit (N8) are connected to the fixed bed unit (N4), and the cooling unit (N7) and the humidifying and feeding unit (N8) are located downstream of the airflow wire drying unit (N3), and the discharging unit (N6) is located at the bottom of the fixed bed unit (N4). The airflow tobacco drying machine of the present invention has both cooling and humidifying functions, which can realize rapid cooling of the tobacco cut temperature after airflow drying, and realize the function of humidifying and feeding the tobacco cut after airflow drying, which can effectively improve the sensory quality and moisture content stability of the tobacco cut after airflow drying, and at the same time effectively reduce the influence of the temperature and humidity of the tobacco making environment on the moisture content of the tobacco cut after airflow drying, thereby eliminating the subsequent tobacco cut cooling process, which plays a role in simplifying the tobacco cut process and reducing processing costs.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco processing, and in particular relates to an airflow tobacco drying machine with cooling, humidifying and feeding functions and an operating method thereof. Background Art

[0002] Drying of tobacco is a key process in the production of tobacco, and the quality of drying directly affects the intrinsic quality of tobacco products. With the continuous deepening of the domestic tobacco industry's research on airflow drying, airflow drying has become one of the mainstream drying methods.

[0003] The airflow tobacco drying machine mainly adopts the convection heat transfer method, using the process gas heated by the combustion furnace as the heat source. Through the full contact and heating between the tobacco and the high-temperature process gas, the water in the cells on the surface area of ​​the tobacco evaporates, so that the moisture content of the tobacco reaches the required moisture content of the process. The airflow tobacco drying process adopts a high-temperature and rapid tobacco drying mode. The process gas temperature is relatively high, generally around 200°C, and the tobacco dehydration is completed in 1 to 2 seconds. Due to the high process gas wind speed, short drying time and uneven distribution of tobacco in the airflow tube, the moisture content of the material outlet fluctuates greatly, and it is easy to form "agglomeration" and "wet clusters", and the tobacco is broken into large pieces.

[0004] The processing intensity of airflow drying is a key indicator affecting the intrinsic quality of tobacco after drying, which is mainly affected by the comprehensive influence of many processing parameters such as material flow rate, process gas temperature, process gas wind speed, and dehumidification valve opening. Obviously, the processing intensity of airflow drying is also a key factor affecting the moisture content of tobacco after drying. The existing airflow drying machine only plays the role of drying and controlling the moisture content of tobacco materials. The problem is that the moisture content in tobacco materials is easily affected by the ambient temperature and humidity of the silk-making workshop, which causes the moisture content of tobacco at the entrance of drying to fluctuate, which directly leads to the poor stability of the moisture content at the outlet of different batches of tobacco materials under the same processing intensity. In order to solve this problem, at present, in order to ensure the stable control of the moisture content of tobacco at the outlet of airflow drying, cigarette manufacturers generally regulate and control it mainly through tobacco material flow rate, process gas temperature and compensation steam volume, but the adjustment of parameters such as tobacco material flow rate, process gas temperature and compensation steam volume is actually regulated at the expense of processing intensity fluctuations. Therefore, the current traditional airflow tobacco drying machine control method cannot simultaneously ensure the stability of the control processing intensity and the moisture content of the exported tobacco, which will lead to the risk of fluctuations in the quality of cigarette products.

[0005] In addition, the temperature of the tobacco at the outlet after airflow drying is relatively high (above 60°C), and a cooling link is generally set up afterwards. Since the tobacco after drying is transported during the process of being affected by the changes in the ambient temperature and humidity in the tobacco-making workshop, even if the moisture content of the tobacco at the outlet of the drying is consistent, the moisture content of the tobacco during the transportation process will be affected by the changes in the ambient temperature and humidity in the tobacco-making workshop, causing the moisture content of the tobacco entering the cooling link to fluctuate, thereby causing the moisture content of the tobacco after the cooling process to fluctuate, which in turn will cause fluctuations in the quality of cigarettes.

[0006] The present invention is proposed to solve the above-mentioned problems. Summary of the invention

[0007] Airflow tobacco drying is one of the important ways to dry tobacco materials. An airflow tobacco drying machine with cooling and humidifying and feeding functions has been developed to achieve rapid cooling of tobacco cuts after airflow drying, and to realize functions such as humidifying and feeding tobacco cuts to add flavor after airflow drying. At the same time, on the basis of ensuring consistent airflow tobacco drying processing intensity, stable control of the moisture content of exported tobacco cuts can be achieved, the sensory quality and moisture content stability of tobacco cuts after airflow drying can be improved, the influence of the temperature and humidity of the tobacco making environment on the moisture content of tobacco cuts after airflow drying can be reduced, and the subsequent tobacco cuts cooling process can be cancelled, which has significant practical significance for improving the quality of airflow tobacco cuts and stabilizing product quality.

[0008] The purpose of the present invention is to address the deficiencies in the prior art and to provide an airflow tobacco drying machine with cooling and humidifying and feeding functions, which can quickly cool the tobacco after airflow drying and has the functions of adjusting the moisture content of the tobacco and adding flavor and materials, and can effectively improve the comprehensive tobacco drying quality including the physical quality and intrinsic quality of the tobacco.

[0009] The purpose of the present invention is achieved through the following technical solutions.

[0010] A first aspect of the present invention provides an airflow wire drying machine with cooling and humidifying and feeding functions, comprising a hot air generating unit (N1), a feeding unit (N2), an airflow wire drying unit (N3), a fixed bed unit (N4), an exhaust unit (N5), a discharging unit (N6), a cooling unit (N7), and a humidifying and feeding unit (N8);

[0011] The hot air generating unit (N1) and the feeding unit (N2) are located upstream of the airflow drying unit (N3); the hot air generating unit (N1) is used to generate hot air, and the feeding unit (N2) is used to add tobacco materials, and both the hot air and the tobacco materials enter the downstream airflow drying unit (N3) for drying.

[0012] The fixed bed unit (N4) is located downstream of the airflow drying unit (N3), and the tobacco material after the drying process and the hot air enter the fixed bed unit (N4) together;

[0013] The exhaust unit (N5) is located on the top of the fixed bed unit (N4), and the hot air is discharged through the exhaust unit (N5);

[0014] The cooling unit (N7) and the humidifying and feeding unit (N8) are connected to the fixed bed unit (N4), and the cooling unit (N7) and the humidifying and feeding unit (N8) are located downstream of the airflow drying unit (N3); the cooling unit (N7) cools the tobacco material after the drying process, and the humidifying and feeding unit (N8) humidifies and feeds the tobacco material after the drying process;

[0015] The discharging unit (N6) is located at the bottom of the fixed bed unit (N4), and the tobacco material after completing the drying, cooling, humidification and feeding processes is discharged through the discharging unit (N6).

[0016] Preferably, the cooling unit (N7) is located upstream of the humidifying and feeding unit (N8).

[0017] Preferably, the hot air generating unit (N1) comprises a combustion furnace (29), a hot air duct (28) and a hot air valve (27); the hot air duct (28) is connected to the combustion furnace (29) and the airflow drying unit (N3) to transport the hot air generated by the combustion furnace (29) to the airflow drying unit (N3); the hot air valve (27) is located on the hot air duct (28) to control the amount of hot air passing through;

[0018] The feeding unit (N2) includes a material feeding bin (24), a feeding air lock (25) and a feeding pipe (26); the feeding pipe (26) is connected to the material feeding bin (24) and the airflow drying unit (N3) to transport the tobacco material in the material feeding bin (24) to the airflow drying unit (N3); the feeding air lock (25) is located on the feeding pipe (26) to control the feeding amount.

[0019] The airflow drying unit (N3) comprises an airflow conveying drying tube (17), which is connected to an upstream hot air generating unit (N1), a feeding unit (N2) and a downstream fixed bed unit (N4); a section of the airflow conveying drying tube (17) extending into the fixed bed unit (N4) is an airflow material outlet section (5).

[0020] The fixed bed unit (N4) comprises a fixed bed (6), an air outlet (4) and a material outlet (13), wherein the air outlet (4) is located at the top of the fixed bed (6), and the material outlet (13) is located at the bottom of the fixed bed (6);

[0021] The exhaust unit (N5) comprises a dust collector (1), a moisture exhaust duct (3), and a moisture exhaust valve (2); the moisture exhaust duct (3) is connected to the dust collector (1) and the fixed bed unit (N4) so ​​as to transport the utilized hot air in the fixed bed unit (N4) to the dust collector (1); the moisture exhaust duct (3) is provided with a moisture exhaust valve (2) so as to control the exhaust air volume;

[0022] The discharge unit (N6) comprises a discharge air lock (14), a discharge pipe (15) and a discharge conveying device (16); the discharge pipe (15) is connected to the discharge conveying device (16) and the fixed bed unit (N4) to convey the tobacco material in the fixed bed unit (N4) after the drying, cooling, humidification and feeding processes to the discharge conveying device (16); the discharge pipe (15) is provided with a discharge air lock (14) to control the discharge amount;

[0023] The cooling unit (N7) comprises a compressed air source (7, 20), a compressed air duct (9, 18) and a compressed air valve (8, 19); the compressed air duct (9, 18) is connected to the compressed air source (7, 20) and the fixed bed unit (N4) to transport cold air to the fixed bed unit (N4); the compressed air duct (9, 18) is provided with a compressed air valve (8, 19) to control the amount of cold air;

[0024] The humidifying and feeding unit (N8) comprises a liquid feed nozzle (21, 12), a liquid feed valve (22, 11) and a liquid feed bin (23, 10); the liquid feed nozzle (21, 12) is connected to the liquid feed bin (23, 10) and the fixed bed unit (N4) to transport the liquid feed to the fixed bed unit (N4); the liquid feed nozzle (21, 12) is provided with a liquid feed valve (22, 11) to control the amount of liquid feed added.

[0025] Preferably, the cooling units (N7) are in two groups and are located on both sides.

[0026] Preferably, the humidifying and feeding units (N8) are in two groups and are located on both sides.

[0027] Preferably, the gas flow material outlet section (5) penetrates horizontally from the upper part of the fixed bed (6) to the central axial position of the fixed bed (6), and then extends vertically upward to the top of the fixed bed (6).

[0028] Preferably, the compressed air ducts (9, 18) penetrate symmetrically from both sides of the upstream of the fixed bed (6), and the upward angle range of entering the fixed bed (6) is 45° to 60°, and the compressed air wind speed range is 0 to 3 m / s; the liquid nozzles (21, 12) penetrate symmetrically from both sides of the middle and downstream of the fixed bed (6), and the downward angle range of entering the fixed bed (6) is 30° to 45°, and the liquid flow rate range is 0 to 30 kg / h.

[0029] Preferably, the temperature of the hot air entering the airflow conveying drying tube (17) through the combustion furnace (29) is in the range of 150°C to 200°C, and the speed of the hot air is in the range of 15 to 25 m / s; the tobacco material entering through the material feed bin (24) can be one or a mixture of tobacco leaves, tobacco shreds, tobacco stems, stem shreds, thin slices, thin slice shreds, etc.

[0030] Preferably, the liquid in the liquid bin (23, 10) can be one of water, sugar, and essence. If it is water, it can play a role of humidification, and if it is sugar or essence, it can play a role of humidification and feeding.

[0031] The second aspect of the present invention provides an operating method of the airflow tofu drying machine with cooling and humidifying functions according to the first aspect of the present invention, comprising the following steps:

[0032] A. After being heated in the combustion furnace (29), the hot air enters the airflow conveying wire drying tube (17) through the hot air duct (28), then quickly moves forward along the airflow conveying wire drying tube (17) and enters the top of the fixed bed (6) from the outlet of the airflow conveying wire drying tube (17), and finally is discharged from the fixed bed (6) through the moisture exhaust duct (3) and the dust collector (1);

[0033] B. The tobacco material enters the feed air lock (25) through the material feed bin (24), and enters the interior of the airflow conveying and drying tube (17) through the feed pipe (26). Under the action of hot air in the airflow conveying and drying tube (17), the tobacco material is transported forward along the airflow conveying and drying tube (17) to the outlet of the airflow conveying and drying tube (17) and enters the top of the fixed bed (6). Since the weight of the tobacco material in the fixed bed (6) is greater than the buoyancy acting upward, the tobacco material slowly falls downward along the fixed bed (6), enters the discharge air lock (14) through the material outlet (13), and is finally discharged through the discharge pipe (15) and the discharge conveying device (16);

[0034] C. Compressed air passes through the compressed air sources (7) and (20) through the compressed air pipes (9) and (18) and enters the fixed bed (6), then flows upward along the fixed bed (6), enters the moisture exhaust duct (3) through the air outlet (4), and finally is discharged through the dust collector (1);

[0035] D. The liquid feed passes through the liquid feed bin (23, 10) and the liquid feed nozzle (21, 12) into the fixed bed (6), and is sprayed and attached to the tobacco material, and then is discharged along with the tobacco material through the material outlet (13), the discharge air lock (14) and the discharge pipe (15);

[0036] E. The moisture content and temperature of the tobacco material on the discharge conveying device (16) and the hot air temperature and hot air speed in the airflow conveying drying tube (17) are kept constant. According to the inlet moisture content and flow rate of the tobacco material, appropriate compressed air speed and liquid flow rate are selected for matching, so as to finally achieve the drying effect and corresponding process requirements of coordinated and stable control of airflow drying processing intensity and outlet material moisture content.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention is an airflow wire drying machine with cooling and humidifying and feeding functions, comprising a hot air generating unit (N1), a feeding unit (N2), an airflow wire drying unit (N3), a fixed bed unit (N4), an exhaust unit (N5), a discharging unit (N6), a cooling unit (N7), and a humidifying and feeding unit (N8); the hot air generating unit (N1) and the feeding unit (N2) are located upstream of the airflow wire drying unit (N3), the fixed bed unit (N4) is located downstream of the airflow wire drying unit (N3), the exhaust unit (N5) is located at the top of the fixed bed unit (N4), the cooling unit (N7) and the humidifying and feeding unit (N8) are connected to the fixed bed unit (N4), and the cooling unit (N7) and the humidifying and feeding unit (N8) are located downstream of the airflow wire drying unit (N3), and the discharging unit (N6) is located at the bottom of the fixed bed unit (N4). The present invention directly integrates the cooling process, the airflow drying process and the humidification and feeding process together, which can avoid the fluctuation caused by the different moisture content of the tobacco feed on the one hand, and on the other hand ensure the stable control of the moisture content of the cooled tobacco, thereby reducing the influence of the workshop environment temperature and humidity on the moisture content of the tobacco.

[0039] 2. In the airflow tobacco drying machine with cooling and humidifying functions of the present invention, the tobacco is dried through the airflow conveying pipe and enters above the fixed bed. When the tobacco loosely falls to the middle and upper part of the fixed bed under the action of its own gravity, the high-temperature tobacco is quickly cooled to room temperature under the action of compressed air, which effectively reduces the influence of the temperature and humidity of the tobacco making environment on the moisture content of the tobacco during the subsequent tobacco conveying process, improves the stability of the physical quality of the tobacco, and can eliminate the subsequent tobacco cooling process, thereby simplifying the tobacco making process and reducing processing costs.

[0040] 3. In the airflow tobacco drying machine with cooling and humidifying functions of the present invention, after being dried by the airflow conveying pipe, the tobacco enters above the fixed bed, and loosely falls downward to the middle and lower part of the fixed bed under the action of its own gravity. The liquid nozzle group humidifies the loosely falling tobacco to the moisture content required by the process, which can effectively improve the stability of the moisture content of the tobacco after airflow drying, and at the same time effectively solve the hidden danger of fluctuation in the intrinsic quality of the tobacco caused by the need to control the stability of the moisture content of the tobacco by adjusting the processing intensity when the moisture content of the tobacco at the inlet of airflow drying fluctuates; thereby effectively improving the physical and intrinsic quality stability of the tobacco.

[0041] 4. In the airflow tobacco drying machine with cooling and humidifying functions of the present invention, the tobacco is dried through the airflow conveying tube and then enters the top of the fixed bed. The tobacco forms a certain "clump" or "wet cluster" in the airflow conveying tube. The tobacco is naturally loosened in the fixed bed due to its own gravity and a certain buoyancy, which can effectively reduce the loss of tobacco materials.

[0042] 5. The airflow silk drying machine with cooling and humidifying functions of the present invention also has the functions of adding fragrance and materials, which can effectively simplify the processing process and equipment of subsequent processes and save processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the airflow silk drying machine with cooling and humidifying functions of the present invention.

[0044] Explanation of reference numerals: (N1) hot air generating unit, (N2) feeding unit, (N3) airflow drying unit, (N4) fixed bed unit, (N5) exhaust unit, (N6) discharging unit, (N7) cooling unit, (N8) humidifying feeding unit, 1-dust collector; 2-dehumidification valve; 3-dehumidification air duct; 4-air outlet; 5-airflow material outlet section; 6-fixed bed; 7-compressed air source; 8-compressed air valve; 9-compressed air duct; 10-liquid Bin; 11-liquid material valve; 12-liquid material nozzle; 13-material outlet; 14-discharge air lock; 15-discharge pipe; 16-discharge conveying device; 17-air flow conveying pipe; 18-compressed air inlet; 19-compressed air valve; 20-compressed air source; 21-liquid material nozzle; 22-liquid material valve; 23-liquid material bin; 24-material feeding device; 25-feeding air lock; 26-feeding pipe; 27-hot air valve; 28-hot air duct; 29-combustion furnace. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the accompanying drawings and embodiments are not intended to limit the technical solution of the present invention. Any changes or improvements made based on the teachings of the present invention fall within the protection scope of the present invention.

[0046] like Figure 1 As shown, an airflow wire drying machine with cooling and humidifying feeding functions comprises a dust collector (1), a dehumidification air duct (3), a fixed bed (6), a compressed air duct (9, 18), a liquid material nozzle (21, 12), a discharge air lock (14), a discharge conveying device (16), an airflow conveying wire drying pipe (17), a material feeding device (18), a feeding air lock (25), and a combustion furnace (29); the lower part of the material feeding device (18) is connected to the feeding air lock (25), the lower part of the feeding air lock (25) is connected to the feeding pipe (26), and the middle and downstream of the feeding pipe (26) are connected to the airflow conveying wire drying pipe (17); one side of the airflow conveying wire drying pipe (17) is connected to the combustion furnace (29). 9), and the other side penetrates into the fixed bed (6) and extends upward to the top of the fixed bed (6); the compressed air duct (9, 18) is respectively located on both sides of the upstream of the fixed bed (6), and the liquid nozzles (21, 12) are respectively located on both sides of the middle and downstream of the fixed bed (6); the top of the fixed bed (6) is connected to the air outlet (4), the air outlet (4) is connected to the dehumidification air duct (3), and the outlet of the dehumidification air duct (3) is connected to the dust collector; the bottom of the fixed bed (6) is connected to the material outlet (13), the material outlet (13) is connected to the discharge air lock (14), the discharge air lock (14) is connected to the discharge pipe (15), and the discharge pipe (15) is connected to the discharge conveying device (16).

[0047] The dehumidification air duct (3) is provided with a dehumidification valve (2); the compressed air air ducts (9, 18) are provided with compressed air valves (8) and (19) respectively, and are connected to compressed air sources (7) and (20) respectively; the liquid feed nozzles (21, 12) are provided with liquid feed valves (11) and (22) respectively, and are connected to liquid feed bins (23, 10) respectively; and the airflow conveying wire drying tube (17) is provided with a hot air valve (27).

[0048] The gas flow material outlet section (5) penetrates horizontally from the upper part of the fixed bed (6) to the central axial position of the fixed bed (6), and then extends vertically upward to the top of the fixed bed (6).

[0049] The compressed air ducts (9, 18) penetrate symmetrically from both sides of the upstream of the fixed bed (6), and the upward angle range of entering the fixed bed (6) is 45°; the liquid nozzles (21, 12) penetrate symmetrically from both sides of the middle and downstream of the fixed bed (6), and the downward angle range of entering the fixed bed (6) is 30°.

[0050] The temperature of the hot air entering the airflow conveying tobacco drying tube (17) through the combustion furnace (29) is 180°C, and the hot air speed is 20m / s; the opening of the dehumidification valve (2) is 50%; the compressed air speed through the compressed air duct (9, 18) is 2m / s; the flow rate of tobacco entering the material feeding bin (24) is 2000kg / h; the diameter of the fixed bed is 2m and the height is 4m.

[0051] The experimental object is 6000kg of shredded tobacco from a shredded production line of a cigarette factory, the moisture content of which is 21.0%, and the moisture content of the shredded tobacco after drying is required to be 13.0±1.0%. The shredded tobacco is divided into two equal parts, and the shredded tobacco is dried by the conventional HTD-FX airflow shred drying machine and the present invention, respectively. The comparative analysis of the results after treatment is shown in Table 1.

[0052] Table 1 Comparative analysis of the results of the traditional HTD-FX airflow torrefied wire drying machine and the torrefied wire drying process of the present invention

[0053]

[0054]

[0055] As can be seen from Table 1, compared with the traditional HTD-FX airflow dryer, the airflow dryer with cooling and humidifying feeding functions of the present invention is used to treat the cut tobacco under the same conditions. The central value of the moisture content of the dried tobacco is closer to the standard central value, and the allowable standard deviation is smaller than the standard allowable standard value, indicating that the stability of the moisture content of the tobacco is significantly improved; the temperature of the dried tobacco using the airflow dryer of the present invention is only about 28°C, which is close to the ambient temperature and humidity of the silk-making workshop, indicating that the present invention has the function of rapidly cooling the temperature of the tobacco; at the same time, the sensory quality score of the tobacco in the batch of the present invention fluctuates less, and the tobacco loss during the drying process is less. Therefore, the airflow dryer with cooling and humidifying feeding functions of the present invention has significant advantages in improving the physical and intrinsic quality stability of tobacco, rapidly cooling tobacco, and reducing the loss of tobacco during the drying process, and has good application prospects and promotion and application value.

Claims

1. An airflow wire drying machine with cooling and humidifying feeding functions, characterized in that: It comprises a hot air generating unit (N1), a feeding unit (N2), an airflow drying unit (N3), a fixed bed unit (N4), an exhaust unit (N5), a discharging unit (N6), a cooling unit (N7), and a humidifying and feeding unit (N8); The hot air generating unit (N1) and the feeding unit (N2) are located upstream of the airflow drying unit (N3); the hot air generating unit (N1) is used to generate hot air, and the feeding unit (N2) is used to add tobacco materials, and both the hot air and the tobacco materials enter the downstream airflow drying unit (N3) for drying. The fixed bed unit (N4) is located downstream of the airflow drying unit (N3), and the tobacco material after the drying process and the hot air enter the fixed bed unit (N4) together; The exhaust unit (N5) is located on the top of the fixed bed unit (N4), and the hot air is discharged through the exhaust unit (N5); The cooling unit (N7) and the humidifying and feeding unit (N8) are connected to the fixed bed unit (N4), and the cooling unit (N7) and the humidifying and feeding unit (N8) are located downstream of the airflow drying unit (N3); the cooling unit (N7) cools the tobacco material after the drying process, and the humidifying and feeding unit (N8) humidifies and feeds the tobacco material after the drying process; The discharging unit (N6) is located at the bottom of the fixed bed unit (N4), and the tobacco material after the drying, cooling, humidification and feeding processes is discharged through the discharging unit (N6); The cooling unit (N7) is located upstream of the humidifying and feeding unit (N8); The hot air generating unit (N1) comprises a combustion furnace (29), a hot air duct (28) and a hot air valve (27); the hot air duct (28) is connected to the combustion furnace (29) and the airflow drying unit (N3) to transport the hot air generated by the combustion furnace (29) to the airflow drying unit (N3); the hot air valve (27) is located on the hot air duct (28) to control the amount of hot air passing through; The feeding unit (N2) comprises a material feeding bin (24), a feeding air lock (25) and a feeding pipe (26); the feeding pipe (26) is connected to the material feeding bin (24) and the airflow drying unit (N3) to transport the tobacco material in the material feeding bin (24) to the airflow drying unit (N3); the feeding air lock (25) is located on the feeding pipe (26) to control the feeding amount; The airflow drying unit (N3) comprises an airflow conveying drying tube (17), which is connected to the upstream hot air generating unit (N1), the feeding unit (N2) and the downstream fixed bed unit (N4); a section of the airflow conveying drying tube (17) extending into the fixed bed unit (N4) is an airflow material outlet section (5); The fixed bed unit (N4) comprises a fixed bed (6), an air outlet (4) and a material outlet (13), wherein the air outlet (4) is located at the top of the fixed bed (6), and the material outlet (13) is located at the bottom of the fixed bed (6); The exhaust unit (N5) comprises a dust collector (1), a moisture exhaust duct (3), and a moisture exhaust valve (2); the moisture exhaust duct (3) is connected to the dust collector (1) and the fixed bed unit (N4) so ​​as to transport the utilized hot air in the fixed bed unit (N4) to the dust collector (1); the moisture exhaust duct (3) is provided with a moisture exhaust valve (2) so as to control the exhaust air volume; The discharge unit (N6) comprises a discharge air lock (14), a discharge pipe (15) and a discharge conveying device (16); the discharge pipe (15) is connected to the discharge conveying device (16) and the fixed bed unit (N4) to convey the tobacco material in the fixed bed unit (N4) after the drying, cooling, humidification and feeding processes to the discharge conveying device (16); the discharge pipe (15) is provided with a discharge air lock (14) to control the discharge amount; The cooling unit (N7) comprises a compressed air source (7, 20), a compressed air duct (9, 18) and a compressed air valve (8, 19); the compressed air duct (9, 18) is connected to the compressed air source (7, 20) and the fixed bed unit (N4) to transport cold air to the fixed bed unit (N4); the compressed air duct (9, 18) is provided with a compressed air valve (8, 19) to control the amount of cold air; The humidifying and feeding unit (N8) comprises a liquid feed nozzle (21, 12), a liquid feed valve (22, 11) and a liquid feed bin (23, 10); the liquid feed nozzle (21, 12) is connected to the liquid feed bin (23, 10) and the fixed bed unit (N4) to transport the liquid feed to the fixed bed unit (N4); the liquid feed nozzle (21, 12) is provided with a liquid feed valve (22, 11) to control the amount of liquid feed added.

2. The airflow wire drying machine with cooling and humidifying feeding functions according to claim 1 is characterized in that: The cooling units (N7) are divided into two groups and are located on both sides.

3. The airflow wire drying machine with cooling and humidifying feeding functions according to claim 1 is characterized in that: The humidifying and feeding units (N8) are divided into two groups and are located on both sides.

4. The airflow wire drying machine with cooling and humidifying feeding functions according to claim 1, characterized in that: The gas flow material outlet section (5) penetrates horizontally from the upper part of the fixed bed (6) to the central axial position of the fixed bed (6), and then extends vertically upward to the top of the fixed bed (6).

5. The airflow dryer with cooling and humidifying feeding functions according to claim 1, characterized in that: The compressed air ducts (9, 18) penetrate symmetrically from both sides of the upstream of the fixed bed (6), and the upward angle range of entering the fixed bed (6) is 45° to 60°, and the compressed air wind speed range is 0 to 3 m / s; the liquid nozzles (21, 12) penetrate symmetrically from both sides of the middle and downstream of the fixed bed (6), and the downward angle range of entering the fixed bed (6) is 30° to 45°, and the liquid flow rate range is 0 to 30 kg / h.

6. The airflow wire drying machine with cooling and humidifying feeding functions according to claim 1, characterized in that: The temperature of the hot air entering the airflow conveying drying tube (17) through the combustion furnace (29) is in the range of 150°C to 200°C, and the speed of the hot air is in the range of 15 to 25 m / s; the tobacco material entering through the material feeding bin (24) can be one or a mixture of tobacco leaves, tobacco shreds, tobacco stems, stem shreds, thin slices, thin slice shreds, etc.

7. The airflow wire drying machine with cooling and humidifying feeding functions according to claim 1, characterized in that: The liquid in the liquid bin (23, 10) can be one of water, sugar, and essence. If it is water, it can play a role of humidification, and if it is sugar or essence, it can play a role of adding ingredients and flavoring.

8. An operating method of the airflow dryer with cooling and humidifying feeding functions according to any one of claims 1 to 7, characterized in that: The following steps are involved: A. After being heated in the combustion furnace (29), the hot air enters the airflow conveying wire drying tube (17) through the hot air duct (28), then quickly moves forward along the airflow conveying wire drying tube (17) and enters the top of the fixed bed (6) from the outlet of the airflow conveying wire drying tube (17), and finally is discharged from the fixed bed (6) through the moisture exhaust duct (3) and the dust collector (1); B. The tobacco material enters the feed air lock (25) through the material feed bin (24), and enters the interior of the airflow conveying and drying tube (17) through the feed pipe (26). Under the action of hot air in the airflow conveying and drying tube (17), the tobacco material is transported forward along the airflow conveying and drying tube (17) to the outlet of the airflow conveying and drying tube (17) and enters the top of the fixed bed (6). Since the weight of the tobacco material in the fixed bed (6) is greater than the buoyancy acting upward, the tobacco material slowly falls downward along the fixed bed (6), enters the discharge air lock (14) through the material outlet (13), and is finally discharged through the discharge pipe (15) and the discharge conveying device (16); C. Compressed air passes through the compressed air source (7, 20) and the compressed air duct (9, 18) into the fixed bed (6), then flows upward along the fixed bed (6), enters the moisture exhaust duct (3) through the air outlet (4), and finally is discharged through the dust collector (1); D. The liquid feed passes through the liquid feed bin (23, 10) and the liquid feed nozzle (21, 12) into the fixed bed (6), and is sprayed and attached to the tobacco material, and then is discharged along with the tobacco material through the material outlet (13), the discharge air lock (14) and the discharge pipe (15); E. The moisture content and temperature of the tobacco material on the discharge conveying device (16) and the hot air temperature and hot air speed in the airflow conveying drying tube (17) are kept constant. According to the inlet moisture content and flow rate of the tobacco material, appropriate compressed air speed and liquid flow rate are selected for matching, so as to finally achieve the drying effect and corresponding process requirements of coordinated and stable control of airflow drying processing intensity and outlet material moisture content.

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