Waste gas circulation heat energy recovery dryer

Abstract

The utility model relates to the technical field of agricultural product drying, and provides a waste gas circulation heat energy recovery dryer which comprises a drying bin and a hot gas circulation system. The hot air circulation system comprises a centrifugal dehumidifier used for separating water and impurities in hot air; one end of the moisture pipe is connected with the drying bin air outlet, and the other end of the moisture pipe is connected with the moisture inlet of the centrifugal dehumidifier; one end of the dry air pipe is connected with an air outlet of the centrifugal dehumidifier; the fan is used for driving hot air in the drying bin to flow into one end of the moisture pipe; an air outlet of the heater is communicated with an air inlet of the drying bin, and an air inlet of the heater is connected with a circulating valve and communicated with the other end of the dry air pipe through the circulating valve. The grain drying device has the advantages that in the grain drying process, drying waste gas is recycled, few impurities exist after drying, the safe water content of grains can be achieved, waste heat of the waste gas is recycled, energy consumption of equipment for gas processing is reduced, and energy is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of drying agricultural products, in particular to a waste gas circulation heat energy recovery drying machine. Background Art

[0002] In the grain production process, grain drying is the most labor-intensive link in the entire production process. Grain drying does not mean direct drying at a constant temperature. The moisture content of the grain must reach a safe moisture content for storage. Grains are easily damaged and have a high moisture content during the drying process. In order to ensure that the quality of the grain is not damaged and to remove excess moisture at the same time, non-destructive drying of the grain becomes one of the key technologies of the dryer. The prior art mainly uses a countercurrent grain dryer to introduce a hot air flow into the dryer, and the direction of movement of the hot air flow is opposite to the direction of grain flow. However, the current countercurrent grain dryer provides a hot air flow by directly heating the external air. Therefore, this method often results in more impurities in the grain after drying, and the hot air is directly discharged, resulting in heat waste.

[0003] Therefore, a waste gas circulation heat energy recovery dryer is proposed. In the process of drying grains, the grains are not easily damaged, the impurities are small after drying, the safe moisture content of the grains can be achieved, and energy is saved. Utility Model Content

[0004] In view of the shortcomings of existing grain dryers, such as many impurities and easy damage after drying, a waste gas circulation heat recovery dryer is provided. During the drying process, the grains are not easily damaged, and there are fewer impurities after drying, which can reach the safe moisture content of the grains. The waste heat of the waste gas is recovered and reused, which reduces the energy consumption of the equipment for gas processing and saves energy.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] The waste gas circulation heat recovery dryer includes: drying chamber, hot gas circulation system;

[0007] The hot air circulation system includes: a centrifugal dehumidifier, which is used to separate water and impurities in hot air; a wet air pipe, one end of which is connected to the air outlet of the drying chamber, and the other end of which is connected to the wet air inlet of the centrifugal dehumidifier; a dry air pipe, one end of which is connected to the air outlet of the centrifugal dehumidifier; a fan, which is used to drive the hot air in the drying chamber to flow into one end of the wet air pipe; a heater, whose air outlet is connected to the air inlet of the drying chamber, and whose air inlet is connected to a circulation valve and is connected to the other end of the dry air pipe through the circulation valve.

[0008] In a preferred embodiment of the present scheme, the centrifugal dehumidifier includes a centrifugal dehumidification box; the centrifugal dehumidification box has a drainage pipe opening at the bottom and an exhaust pipe inside; the exhaust pipe, the top of which passes through the centrifugal dehumidification box upward and is connected to one end of the dry gas pipe, and the bottom of which is suspended at the bottom of the centrifugal dehumidification box; a spiral track is arranged on the outside of the exhaust pipe along its outer wall, and the outer edge of the spiral track is connected to the inner wall of the centrifugal dehumidification box, and the moisture inlet of the centrifugal dehumidification box is arranged at the top of the centrifugal dehumidification box, so that the gas entering the air inlet of the centrifugal dehumidification box can spiral downward along the spiral track.

[0009] In a preferred embodiment of the present invention, the exhaust duct is provided with multiple layers of paper fiber packing modules up and down; the exhaust duct is also provided with a paper fiber placer, the multiple layers of paper fiber packing modules are horizontally mounted on the paper fiber placer, and the paper fiber placer is detachably fixed in the exhaust duct. Water in the exhaust gas adheres to the paper fiber packing and flows downward under the action of gravity and capillary force.

[0010] In a preferred embodiment of the present solution, the centrifugal dehumidifier includes two centrifugal dehumidification boxes, and the two centrifugal dehumidification boxes are connected in series.

[0011] In a preferred embodiment of the present invention, the drainage pipe port is connected to the drainage pipe, and a float type drain valve is arranged at the drainage pipe port. Water accumulated at the bottom of the centrifugal dehumidifier can be automatically drained.

[0012] In a preferred embodiment of the present scheme, a humidity detector is provided on the dry gas pipe to detect the humidity of the gas in the dry gas pipe; the hot gas circulation system also includes a dehumidification air inlet pipe; the circulation valve is a three-way valve, and the input end of the circulation valve is connected to the other end of the dry gas pipe; the first output end of the circulation valve is connected to the air inlet of the heater, and the second output end of the circulation valve is connected to the wet gas pipe.

[0013] In a preferred embodiment of the present scheme, the waste gas circulation heat recovery dryer also includes a conveying mechanism; the conveying mechanism includes a multi-layer mesh belt conveyor belt, and a feed port is provided at the upper part of the drying bin, and the material to be dried can fall into the first layer of mesh belt conveyor belt located at the top through the feed port; the multi-layer mesh belt conveyor belts are staggered up and down, and the conveying directions of the two adjacent mesh belt conveyor belts are opposite, so that the material on the upper layer of the mesh belt conveyor belt can fall into the lower layer of the mesh belt conveyor belt; a discharge conveyor belt is also provided below the multi-layer mesh belt conveyor belt, and a discharge window is provided on one side of the bottom of the drying bin, and one end of the discharge conveyor belt passes through the discharge window and passes through the drying bin.

[0014] In a preferred embodiment of the present invention, the two ends of the conveyor belt and the two ends of the discharge conveyor belt are respectively provided with a power shaft and a driven shaft, and one end of the power shaft is provided with a sprocket;

[0015] The conveying mechanism also includes: a chain, which is meshed on a plurality of sprocket wheels to drive the power shaft to rotate; and a motor, whose output end is provided with another sprocket wheel, which meshes with the chain to drive the chain to move.

[0016] In a preferred embodiment of the present scheme, the waste gas circulation heat recovery dryer further comprises a hot air circulation box, the hot air circulation box is arranged at the rear side of the drying bin, and the hot air circulation system is arranged in the hot air circulation box.

[0017] In a preferred embodiment of the present scheme, the waste gas circulation heat recovery dryer also includes a touch screen display, which is arranged on the hot air circulation box, and the touch screen display is electrically connected to the humidity detector.

[0018] The touch screen display is connected to the outside of the hot air circulation box through screws, and the wind rate and heating amount of the entire system are adjusted through the humidity detector.

[0019] In a preferred embodiment of the present scheme, the waste gas circulation heat recovery dryer also includes a recovery section box; the recovery section box cover is arranged on the right side of the discharge window, and the right end of the recovery section box is open to facilitate the output of the dried material.

[0020] In a preferred embodiment of the present invention, the centrifugal dehumidifier is threadedly connected to the hot air circulation box through the base, so that the installation is more stable.

[0021] The present invention also provides a method for using the above-mentioned waste gas circulation heat recovery dryer, comprising the following method steps:

[0022] The grain materials are added into the drying bin from the feeding port at the upper part of the drying bin, and the grain materials added into the drying bin fall into the first layer of mesh belt conveyor from the feeding port, and then the multi-layer mesh belt conveyor in the drying bin transports the grain materials downward layer by layer, and the grain materials are dried inside the drying bin at the same time, and the dried grain materials fall into the discharging conveyor from the bottom layer of mesh belt conveyor, and the discharging conveyor outputs the dried materials from the drying bin;

[0023] The hot air for drying the grain material enters the drying chamber from the air inlet, and the exhaust gas carrying water vapor in the drying chamber enters the hot air circulation system from the air outlet driven by the fan;

[0024] The waste gas entering the hot gas circulation system passes through the wet gas pipe, centrifugal dehumidifier, dry gas pipe, and circulation valve in sequence. When the humidity detector at the dry gas pipe detects that the gas humidity meets the requirements, the first output end of the circulation valve is turned on, and the gas that meets the requirements enters the heater for heating, and the heated gas enters the drying chamber from the air inlet of the drying chamber; when the humidity detector detects that the gas humidity does not meet the requirements, the second output end of the circulation valve is turned on, and the gas that does not meet the requirements returns to the wet pipe from the dehumidification inlet pipe.

[0025] In a preferred embodiment of the present scheme, the gas entering the centrifugal dehumidifier spirals downward along a spiral track in the centrifugal dehumidifier, and the gas is separated from the liquid and impurities in the gas during the spiral downward process. The gas then passes through a paper fiber placer in the exhaust duct. In the process of the gas passing through the paper fiber placer, the liquid in the gas adheres to the paper fiber filling module, and the impurities in the gas are filtered again through the paper fiber filling module. The impurities on the paper fiber filling module are discharged from the dryer through the drain pipe together with the liquid, and the gas enters the second centrifugal dehumidifier again through the exhaust duct for a second dehumidification. The gas after the second dehumidification passes through the dry gas pipe circulation valve.

[0026] The beneficial effects of the utility model are:

[0027] (1) The dryer designed in this scheme includes a drying bin, a hot air circulation system, and a conveying mechanism; the conveying mechanism can input and output materials into and out of the drying bin to dry the grain materials in the drying bin; the hot air circulation system provides the drying bin with circulating hot air required for drying the grains; the hot air circulation system includes a fan and a centrifugal dehumidifier, and the exhaust gas from the top of the drying bin is introduced into the centrifugal dehumidifier through the fan, and the water in the exhaust gas can be separated by the centrifugal dehumidifier; the gas after dehydration can be heated by a heater and circulated back to the drying bin from the air inlet of the drying bin, so as to realize the recycling and reuse of the exhaust gas, without the need to introduce air from the outside, and to prevent external impurities from entering the drying bin with the air;

[0028] In addition, the exhaust gas led out by the fan has a certain amount of heat. After the exhaust gas is dehydrated, the heater is used to supplement its heat energy so that the hot gas circulating back to the drying chamber can meet the heat requirement set by the drying airflow. Therefore, this solution can recycle the waste heat of the exhaust gas and reuse it, thereby reducing the energy consumption of the equipment for gas processing and saving energy.

[0029] (2) The conveying mechanism of this scheme includes a multi-layer mesh belt conveyor. The grains entering the drying bin are conveyed downward in a staggered manner from left to right through the multi-layer mesh belt conveyor. The mesh hole design of the mesh belt conveyor is conducive to the passage of hot air, and the grains are not easily damaged during the conveying process;

[0030] (3) The centrifugal dehumidifier includes a centrifugal dehumidification box, the bottom of which is connected to a drainage pipe, and an exhaust pipe is arranged inside the centrifugal dehumidification box; the top of the exhaust pipe is connected to a dry gas pipe, and the bottom of the exhaust pipe is suspended at the bottom of the centrifugal dehumidification box; a spiral track is arranged outside the exhaust pipe; the moisture inlet of the centrifugal dehumidification box is arranged at the top of the centrifugal dehumidification box, so that the gas entering the air inlet of the centrifugal dehumidification box can spiral downward along the spiral track; the gas is partially separated from the liquid and impurities in the gas during the process of spiraling downward along the spiral track, and then the gas passes through a multi-layer paper fiber filling module upward along the exhaust pipe, the liquid in the gas adheres to the paper fiber filling module, the impurities in the gas are filtered again by the paper fiber filling module, the impurities on the paper fiber filling module are discharged from the dryer together with the liquid from the drainage pipe, and the gas enters the second centrifugal dehumidifier again through the exhaust pipe for a second dehumidification. Therefore, compared with the existing dryer, the present invention can separate water and impurities in the exhaust gas through a centrifugal dehumidifier, so that the impurities in the dried grains are less;

[0031] (4) The waste gas circulation heat recovery dryer of the present scheme also includes a humidity detector for detecting the humidity of the gas in the dry gas pipe. When the humidity detector detects that the gas humidity meets the requirements, the first output end of the circulation valve is turned on, and the gas that meets the requirements enters the heater for heating. The heated gas then enters the drying chamber from the air inlet of the drying chamber to realize the circulation of the waste gas; when the humidity detector detects that the gas humidity does not meet the requirements, the second output end of the circulation valve is turned on, and the gas that does not meet the requirements returns from the dehumidification air inlet pipe to the wet air pipe for another dehumidification cycle, and the heating temperature of the heater of the present scheme is adjustable, so that the present scheme can adjust the wind rate and heating amount of the entire system to accurately ensure the temperature required for grain drying and the drying humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of a mesh belt conveyor of the utility model;

[0033] Figure 2 It is a schematic diagram of the hot gas circulation system of the utility model;

[0034] Figure 3 It is a schematic diagram of the conveying mechanism of the utility model;

[0035] Figure 4 It is a schematic diagram of the utility model;

[0036] Figure 5 It is a schematic diagram of the structure of the centrifugal dehumidifier of the utility model;

[0037] Figure 6 It is a schematic diagram of the paper fiber placement device of the utility model;

[0038] Figure 7It is a schematic diagram of the hot air circulation box of the utility model;

[0039] Figure 8 It is a schematic cross-sectional view of a centrifugal dehumidifier of the utility model;

[0040] Among them: 1. Drying bin; 2. Fan; 3. Hot air circulation box; 4. Feed inlet; 5. Moisture pipe; 6. Touch screen display; 8. Dry gas pipe; 9. Heater; 11. Centrifugal dehumidifier; 12. Recovery section box; 14. Dehumidification air inlet pipe; 51. Mesh belt conveyor; 52. Discharge conveyor; 53. Power shaft; 54. Driven shaft; 55. Sprocket; 56. Chain; 57. Motor; 1001. Exhaust duct; 1002. Centrifugal dehumidification box; 1003. Spiral track; 1004. Base; 1005. Moisture inlet; 1006. Drainage pipe outlet; 1007. Paper fiber placer. DETAILED DESCRIPTION

[0041] The technical solution of the present utility model is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present utility model is not limited to the following.

[0042] Example

[0043] refer to Figure 1 , Figure 2 As shown, the waste gas circulation heat recovery dryer includes a drying bin 1, a hot air circulation system, and a conveying mechanism; the conveying mechanism can input and output materials into and out of the drying bin 1 to dry the grain materials in the drying bin 1; the hot air circulation system provides the drying bin 1 with the circulating hot air required for drying the grains.

[0044] Specifically, in this embodiment, reference Figure 2 As shown, the hot air circulation system includes a wet air pipe 5, two centrifugal dehumidifiers 11, a dry air pipe 8 and a heater 9 connected in sequence; a fan 2 is also provided on the wet air pipe 5 to drive the exhaust gas in the drying bin 1 to enter the hot air circulation system from the wet air pipe 5, the wet air pipe 5 is connected to the air outlet of the drying bin 1, the air outlet of the drying bin 1 is arranged at the upper part of the drying bin 1, and the two centrifugal dehumidifiers 11 are connected in series to separate water and impurities in the exhaust gas; the gas after dehydration and impurity removal by the centrifugal dehumidifier 11 enters the heater 9 through the dry air pipe 8 for heating, and then circulates back to the drying bin 1 from the air inlet at the lower part of the drying bin 1.

[0045] In this embodiment, reference Figure 2As shown, the air inlet of the heater 9 is connected to a circulation valve, and the waste gas circulation heat recovery dryer also includes a humidity detector and a dehumidification air inlet pipe 14. The humidity detector can detect the gas humidity in the dry gas pipe 8, and the circulation valve is a three-way valve. The input end of the circulation valve is connected to the outlet end of the dry gas pipe 8; the first output end of the circulation valve is connected to the air inlet of the heater 9, and the second output end of the circulation valve is connected to the wet gas pipe 5. The exhaust pipe 1001 of the second centrifugal dehumidifier 11 is interference fit with the dry gas pipe 8. The hot gas enters from the dry gas pipe 8 and is adjusted through the circulation valve to enter heating or dehumidification again.

[0046] Further optionally, in this embodiment, reference Figure 1 , Figure 4 , Figure 7 As shown, the waste gas circulation heat recovery dryer also includes a touch screen display 6, which is arranged on the hot air circulation box 3, and the touch screen display 6 is electrically connected to the humidity detector. The touch screen display 6 is connected to the outside of the hot air circulation box 3 by screws, and the hot air circulation box 3 is arranged on the rear side of the drying chamber 1. The hot air circulation system is arranged in the hot air circulation box 3. The wind rate and heating amount of the entire system can be adjusted through the humidity detector and the touch screen display 6.

[0047] Furthermore, the humidity is detected by a humidity detector and then fed back to the touch screen display 6. By adjusting the power of the heater 9 through the touch screen display 6, the temperature of the gas entering the drying chamber 1 can be adjusted. At the same time, the touch screen display 6 can also adjust the power of the fan 2, so that the speed at which the gas enters the centrifugal dehumidifier 11 can be adjusted, thereby reducing the amount of heated gas entering the heater 9, and ultimately reducing the amount of hot gas in the drying chamber 1 to achieve heat regulation.

[0048] Further, in this scheme, reference Figure 2 , Figure 5 As shown, the centrifugal dehumidifier 11 includes a centrifugal dehumidification box 1002; a drainage pipe opening 1006 is provided at the bottom of the centrifugal dehumidification box 1002, and an exhaust pipe 1001 is provided inside the centrifugal dehumidification box 1002; the top of the exhaust pipe 1001 passes through the centrifugal dehumidification box 1002 upward and is connected to one end of the dry gas pipe 8, and the bottom of the exhaust pipe 1001 is suspended at the bottom of the centrifugal dehumidification box 1002; a spiral track 1003 is arranged on the outside of the exhaust pipe 1001 along its outer wall; the outer edge of the spiral track 1003 is connected to the inner wall of the centrifugal dehumidification box 1002; the moisture inlet 1005 of the centrifugal dehumidification box 1002 is arranged at the top of the centrifugal dehumidification box 1002, so that the gas entering the air inlet of the centrifugal dehumidification box 1002 can spiral downward along the spiral track 1003.

[0049] In this embodiment, the drainage pipe opening 1006 is interference fit with the drainage pipe, and a float-type drain valve is provided at the drainage pipe opening 1006 .

[0050] Further, refer to Figure 5 , Figure 6 , Figure 8 As shown, in this solution, multiple layers of paper fiber filler modules (not shown in the figure) are provided inside the exhaust duct 1001 from top to bottom; a paper fiber placer 1007 is also provided inside the exhaust duct 1001, and the multiple layers of paper fiber filler modules are horizontally installed on the paper fiber placer 1007, and the paper fiber placer 1007 is detachably fixed in the exhaust duct 1001 by screws.

[0051] In this embodiment, the waste gas circulation heat recovery dryer further includes a base 1004 , which is installed on the hot gas circulation box 3 to support the centrifugal dehumidifier 11 .

[0052] refer to Figure 1 , Figure 3 , Figure 7 As shown, further, in the present embodiment, the conveying mechanism includes a multi-layer mesh belt conveyor 51, and a feed port 4 is provided at the upper part of the drying bin 1, and the material to be dried can fall into the first layer of mesh belt conveyor 51 located at the top through the feed port 4; the multi-layer mesh belt conveyor 51 is staggered up and down, and the conveying directions of the two adjacent mesh belt conveyor 51 are opposite, so that the material on the upper layer of mesh belt conveyor 51 can fall into the lower layer of mesh belt conveyor 51; a discharge conveyor 52 is also provided below the multi-layer mesh belt conveyor 51, and a discharge window is provided on one side of the bottom of the drying bin 1, and one end of the discharge conveyor 52 passes through the discharge window and out of the drying bin 1.

[0053] In this embodiment, reference Figure 1 , Figure 3 As shown, both ends of the conveyor belt 51 and both ends of the discharge conveyor belt 52 are respectively provided with a power shaft 53 and a driven shaft 54, and a sprocket 55 is provided at one end of the power shaft 53; the conveying mechanism also includes: a chain 56, which is engaged with multiple sprockets 55 to drive the power shaft 53 to rotate; a motor 57, whose output end is provided with another sprocket 55, and the sprocket 55 engages with the chain 56 to drive the chain 56 to move.

[0054] Furthermore, in this embodiment, the waste gas circulation heat recovery dryer also includes a recovery section box 12; the recovery section box 12 cover is arranged on the right side of the discharge window, and the right end of the recovery section box 12 is open to facilitate the discharge conveyor belt 52 to output the dried material to the right.

[0055] A method for using the above-mentioned waste gas circulation heat recovery dryer comprises the following steps:

[0056] The grain material is added into the drying bin 1 from the feed port 4 at the upper part of the drying bin 1, and the grain material added into the drying bin 1 falls from the feed port 4 into the first layer of mesh belt conveyor 51, and then the multi-layer mesh belt conveyor 51 in the drying bin 1 transports the grain material downward layer by layer, and the grain material is dried inside the drying bin 1 at the same time, and the dried grain material falls from the bottom layer of mesh belt conveyor 51 into the discharge conveyor 52, and the discharge conveyor 52 outputs the dried material from the drying bin 1;

[0057] The hot air for drying the grain material enters the drying bin 1 from the air inlet, and the exhaust gas carrying water vapor in the drying bin 1 enters the hot air circulation system from the air outlet driven by the fan 2;

[0058] The waste gas entering the hot gas circulation system passes through the wet gas pipe 5, the centrifugal dehumidifier 11, the dry gas pipe 8, and the circulation valve in sequence. When the humidity detector at the dry gas pipe 8 detects that the gas humidity meets the requirements, the first output end of the circulation valve is turned on, and the gas that meets the requirements enters the heater 9 for heating. The heated gas then enters the drying chamber 1 from the air inlet of the drying chamber 1 to realize the circulation of the waste gas; when the humidity detector detects that the gas humidity does not meet the requirements, the second output end of the circulation valve is turned on, and the gas that does not meet the requirements returns to the wet gas pipe 5 from the dehumidification inlet pipe 14 for another dehumidification cycle.

[0059] In this embodiment, the gas entering the centrifugal dehumidifier 11 spirals downward along the spiral track 1003 in the centrifugal dehumidifier 11. During the spiral downward process, the gas is separated from the liquid and impurities in the gas. Then the gas passes through the paper fiber placer 1007 in the exhaust pipe 1001. During the process of the gas passing through the paper fiber placer 1007, the liquid in the gas adheres to the paper fiber filling module, and the impurities in the gas are filtered again through the paper fiber filling module. The impurities on the paper fiber filling module are discharged from the dryer through the drainage pipe together with the liquid, and the gas enters the second centrifugal dehumidifier 11 again through the exhaust pipe 1001 for a second dehumidification. The gas after the second dehumidification passes through the dry gas pipe 8 circulation valve.

[0060] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. Waste gas circulation heat recovery dryer, characterized by include: Drying chamber (1), hot air circulation system; The hot gas circulation system comprises: A centrifugal dehumidifier (11) for separating water and impurities in the hot air; A moisture pipe (5), one end of which is connected to the air outlet of the drying chamber (1), and the other end of which is connected to the moisture inlet (1005) of the centrifugal dehumidifier (11); A dry gas pipe (8), one end of which is connected to the gas outlet of the centrifugal dehumidifier (11); A fan (2) is used to drive the hot air in the drying chamber (1) to flow into one end of the moisture pipe (5); The heater (9) has an air outlet connected to the air inlet of the drying chamber (1), and its air inlet is connected to a circulation valve and is connected to the other end of the dry air pipe (8) through the circulation valve.

2. The waste gas circulation heat recovery dryer according to claim 1, characterized in that: The centrifugal dehumidifier (11) comprises a centrifugal dehumidification box (1002); The centrifugal dehumidification box (1002) has a drainage pipe opening (1006) at the bottom and an exhaust pipe (1001) inside. The exhaust pipe (1001) has a top portion that passes through the centrifugal dehumidification box (1002) and is connected to one end of the dry gas pipe (8), and a bottom portion that is suspended at the bottom of the centrifugal dehumidification box (1002); A spiral track (1003) is arranged on the outside of the exhaust duct (1001) along its outer wall, and the outer edge of the spiral track (1003) is connected to the inner wall of the centrifugal dehumidification box (1002). The moisture inlet (1005) of the centrifugal dehumidification box (1002) is arranged at the top of the centrifugal dehumidification box (1002), so that the gas entering the air inlet of the centrifugal dehumidification box (1002) can spiral downward along the spiral track (1003).

3. The waste gas circulation heat recovery dryer according to claim 2 is characterized in that: The exhaust pipe (1001) is internally provided with multiple layers of paper fiber filler modules at the top and bottom; A paper fiber placer (1007) is also provided inside the exhaust duct (1001), and a multi-layer paper fiber filler module is horizontally installed on the paper fiber placer (1007), and the paper fiber placer (1007) is detachably fixed in the exhaust duct (1001).

4. The waste gas circulation heat recovery dryer according to claim 2, characterized in that: The centrifugal dehumidifier (11) comprises two centrifugal dehumidification boxes (1002), and the two centrifugal dehumidification boxes (1002) are connected in series.

5. The waste gas circulation heat recovery dryer according to claim 2, characterized in that: The drainage pipe opening (1006) is connected to the drainage pipe, and a float-type drain valve is provided at the drainage pipe opening (1006).

6. The waste gas circulation heat recovery dryer according to any one of claims 1 to 5, characterized in that: The dry gas pipe (8) is provided with a humidity detector for detecting the humidity of the gas in the dry gas pipe (8); The hot air circulation system also includes a dehumidification air inlet pipe (14); The circulation valve is a three-way valve, and the input end of the circulation valve is connected to the other end of the dry gas pipe (8); The first output end of the circulation valve is connected to the air inlet of the heater (9), and the second output end of the circulation valve is connected to the wet air pipe (5).

7. The waste gas circulation heat recovery dryer according to any one of claims 1 to 5, characterized in that: The waste gas circulation heat recovery dryer also includes a conveying mechanism; The conveying mechanism comprises a multi-layer mesh belt conveyor (51), and a feed port (4) is provided at the top of the drying chamber (1), and the material to be dried can fall into the first layer of mesh belt conveyor (51) located at the top through the feed port (4); The multiple layers of mesh belt conveyor belts (51) are arranged in an alternating manner, and the conveying directions of two adjacent mesh belt conveyor belts (51) are opposite, so that the materials on the upper layer of mesh belt conveyor belt (51) can fall into the lower layer of mesh belt conveyor belt (51); A discharge conveyor belt (52) is also provided below the multi-layer mesh belt conveyor belt (51), and a discharge window is provided on one side of the bottom of the drying bin (1), and one end of the discharge conveyor belt (52) passes through the discharge window and out of the drying bin (1).

8. The waste gas circulation heat recovery dryer according to claim 7, characterized in that: The two ends of the conveyor belt (51) and the two ends of the discharge conveyor belt (52) are respectively provided with a power shaft (53) and a driven shaft (54), and one end of the power shaft (53) is provided with a sprocket (55); The conveying mechanism also includes: A chain (56) meshed with a plurality of sprockets (55) to drive the power shaft (53) to rotate; The motor (57) has another sprocket (55) at its output end, and the sprocket (55) engages with the chain (56) to drive the chain (56) to move.

9. The waste gas circulation heat recovery dryer according to claim 8, characterized in that: The waste gas circulation heat energy recovery dryer also includes a hot air circulation box (3), the hot air circulation box (3) is arranged on the rear side of the drying chamber (1), and the hot air circulation system is arranged in the hot air circulation box (3).

10. The waste gas circulation heat recovery dryer according to claim 9, characterized in that: The waste gas circulation heat energy recovery dryer further comprises a touch screen display (6), the touch screen display (6) is arranged on the hot gas circulation box (3), and the touch screen display (6) is electrically connected to the humidity detector; The touch screen display (6) is connected to the outside of the hot air circulation box (3) via screws, and the wind rate and heating amount of the entire system are adjusted via a humidity detector.

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