White granulated sugar hot air drying system

Abstract

The utility model discloses a white granulated sugar hot air drying system which comprises a feeding conveying belt, a vibrating screen classifier, a blower device, a powdered sugar collecting device and a fluidized bed device. A discharging conveying belt under the vibrating screen classifier extends to the inlet end of the fluidized bed device, an air outlet of the blower device is communicated with the bottom and the side portion of the fluidized bed device through an air supply pipe, and the top end of the fluidized bed device is connected with the top end of the powdered sugar collecting device through an air inducing pipe. And a pipeline heater is arranged on the air supply pipe. The drying system can solve the problems that the moisture of white granulated sugar is too high and the bagging temperature is too high due to insufficient drying capacity of drying equipment, and the product quality problems of bag wetting, false caking and the like easily caused by unstable moisture of the white granulated sugar.

Description

Technical Field

[0001] The utility model belongs to the technical field of white sugar production, and particularly relates to a hot air drying system for white granulated sugar. Background Art

[0002] White sugar is manufactured by extracting sugar from sugarcane or beets, juicing, filtering, and concentrating to obtain a liquid with a high sugar concentration, and then through chemical or physical methods for decolorization, purification, crystallization and other processing processes, finally obtaining white crystalline sugar particles, namely white granulated sugar; due to the large daily juice extraction volume during the crushing season, during the production and processing process, the vibrating screen and the sugar layer of the dryer of white granulated sugar are relatively thick, and the drying capacity of the drying equipment is insufficient, resulting in large fluctuations in the moisture content of the white granulated sugar at the outlet of the dryer, and the moisture content of the white granulated sugar is relatively high. When packaging the white granulated sugar sent out by the dryer, the packaging moisture and temperature fluctuate greatly, and the high temperature is likely to cause product quality problems such as damp bags and false caking; therefore, it is necessary to dry the white granulated sugar before packaging to reduce the moisture content in the white granulated sugar to the requirements of the process standard and improve the storage quality of refined white granulated sugar. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a hot air drying system for white granulated sugar. The drying system of the utility model can solve the problems of excessive moisture of white granulated sugar caused by insufficient drying capacity of the drying equipment, high packaging temperature, and product quality problems such as damp bags and false caking easily caused by unstable moisture of white granulated sugar. To achieve the above purpose, the utility model adopts the following technical effects:

[0004] According to one aspect of the utility model, there is provided a hot air drying system for white granulated sugar, the hot air drying system includes a feeding conveyor belt, a vibrating screening machine, a blowing device, a sugar powder collecting device and a fluidized bed device. The vibrating screening machine is arranged below the outlet of the feeding conveyor belt. The discharge conveyor belt directly below the vibrating screening machine extends to the inlet end of the fluidized bed device. The air outlet of the blowing device is communicated with the bottom and side of the fluidized bed device through an air supply pipe. The top of the fluidized bed device is communicated with the top of the sugar powder collecting device through an air extraction pipe. A pipeline heater is arranged on the air supply pipe.

[0005] Preferably, the sugar powder collecting device includes an induced draft fan and a sugar powder collecting box body. The air inlet of the induced draft fan is communicated with the top of the fluidized bed device through an air extraction pipe. The air outlet of the induced draft fan is communicated with the top side wall of the sugar powder collecting box body through an air extraction discharge pipe. An exhaust port is arranged at the top of the collecting box body, and a powder discharge port is arranged at the bottom of the collecting box body.

[0006] In a further preferred embodiment of the above solution, the outlet end of the air extraction discharge pipe extends tangentially into the sugar powder collection box at the top side wall of the sugar powder collection box body. A first spray pipe extending into the sugar powder collection box is arranged around the outer walls of the top and bottom of the sugar powder collection box body. A second spray pipe facing the inner direction of the outlet of the air extraction fan is arranged on one side of the outlet of the air extraction fan. A spray head spraying into the air extraction fan is connected to the second spray pipe.

[0007] In a further preferred embodiment of the above solution, the sugar powder collection box body is composed of a cylindrical barrel and a conical barrel integrally formed up and down. First spray pipes are arranged at the bottom end and the top end of the cylindrical barrel. A blowing pipe tangentially extending into the cylindrical barrel is arranged near the bottom end of the cylindrical barrel. A blowing air control valve is arranged on the blowing pipe.

[0008] In a further preferred embodiment of the above solution, the air blowing device includes a blower and an air collecting box. The two sides of the air collecting box are provided with an air inlet and an air outlet. An air filter is arranged on the pipeline where the air outlet of the air collecting box is communicated with the air inlet of the blower. The air outlet of the blower is communicated with the bottom and the side of the fluidized bed device through an air supply pipe. An air dehumidifier is arranged on the air supply pipe near one side of the air outlet of the blower. The pipeline heater includes a heating pipe housing, a power supply box body, a heating controller and a heating relay. The heating controller is arranged on the power supply box body. A first flange and a second flange connected to the air supply pipe are respectively arranged at the front and rear ends of the heating pipe housing. A plurality of heating pipes are closely arranged within the circumference of the heating pipe housing and arranged along the axis direction of the air supply pipe. The power supply transmission end of the power supply box body is connected to the power input end of the heating pipe through the heating relay. The control end of the heating controller is connected to the control end of the heating relay. A first temperature and humidity sensor extending into the air supply pipe is arranged on one side of the second flange. The acquisition output end of the first temperature and humidity sensor is connected to the heating controller.

[0009] In a further preferred embodiment of the above solution, an air duct sterilizer is arranged on the air supply pipe and near one side of the inlet end of the fluidized bed device. The air duct sterilizer includes a sterilization housing and an ultraviolet disinfection lamp tube. An air inlet connecting pipe and an air outlet connecting pipe are respectively arranged at the front and rear ends of the sterilization housing. The ultraviolet disinfection lamp tube is arranged on the inner peripheral wall or the peripheral outer wall of the sterilization housing.

[0010] In a further preferred embodiment of the above solution, a plurality of irradiation concave windows extending along the axis direction are arranged on the peripheral outer wall of the sterilization housing. The ultraviolet disinfection lamp tube is arranged outside the irradiation concave windows. A disinfection protection lamp cover detachably arranged on the sterilization housing is arranged at the edge of the irradiation concave windows. A second temperature and humidity sensor is arranged on one side of the air outlet connecting pipe of the sterilization housing. A heating plate is arranged inside the sterilization housing.

[0011] Further preferably, in the above solution, the fluidized bed device includes a vibration bed body, a vibration box body and a vibration seal cover which are integrally arranged at least in sequence from bottom to top. A hot air inlet is respectively arranged on the side part and the bottom part of the vibration bed body. The upper and lower ends of the vibration box body are open. The lower end of the vibration box body is detachably connected along the edge of the vibration bed body. The vibration seal cover is detachably fixed at the upper end of the vibration box body. A feed inlet is arranged at the top end of the left side wall of the vibration box body. A discharge outlet is arranged at the right end of the vibration bed body. At least two levels of vibration diversion plates which are stepped down from the feed inlet to the discharge outlet direction are arranged on the vibration box body. A plurality of exhaust ports are arranged at the top end of the vibration seal cover. A sugar powder collecting cylinder is arranged above the vibration seal cover. Each exhaust port at the top end of the vibration seal cover is communicated with the bottom end of the sugar powder collecting cylinder through a spiral flexible air duct. The discharge outlet at the top end of the sugar powder collecting cylinder is communicated with the air inlet of the induced draft fan through an induced draft air duct.

[0012] Further preferably, in the above solution, a plurality of third temperature and humidity sensors are arranged in the vibration box body, and air permeable pores are arranged on the surface of the vibration diversion plate.

[0013] In summary, the present utility model adopts the above technical solutions, and the present utility model has the following technical effects:

[0014] (1) The hot air drying system of the present utility model can improve the drying capacity of white granulated sugar. By arranging pipeline heating and air dehumidification equipment at the front section of the drum, the air is dehumidified and heated and then sent into the fluidized bed device to carry out hot air drying on white granulated sugar, which can ensure that the hot air temperature is controlled at about 65 - 70 °C and sent into the fluidized bed device to carry out hot air drying on white granulated sugar. The white granulated sugar sent out after drying in the fluidized bed device can be kept at no less than 51 - 56 °C, so as to solve the problems of excessive moisture of white granulated sugar and too high packing temperature caused by insufficient capacity of the drying equipment, and product quality problems such as moisture instability of white granulated sugar easily leading to damp packages and false caking.

[0015] (2) In the drying system, the sugar powder generated during the drying of the fluidized bed device is sucked out by a fan (induced draft fan), and the sucked sugar powder is sent into the sugar powder collection box body for wet dust removal and recovery, and will not be directly discharged into the air to cause dust pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the system schematic diagram of a hot air drying system for white granulated sugar of the present utility model;

[0017] Figure 2 is the top view structural schematic diagram of the sugar powder collection device of the present utility model;

[0018] Figure 3 is the structural schematic diagram of the fluidized bed device of the present utility model;

[0019] Figure 4 It is a schematic structural view of the vibration diversion plate of the utility model;

[0020] Figure 5 It is a schematic overall structural view of the pipeline heater of the utility model;

[0021] Figure 6 It is a schematic internal structural view of the pipeline heater of the utility model;

[0022] Figure 7 It is a schematic structural view of the air duct sterilizer of the utility model;

[0023] Figure 8 It is a schematic side structural view of the air duct sterilizer of the utility model;

[0024] In the attached drawings, the feeding conveyor belt 1, the vibrating screening machine 2, the air blowing device 3, the powdered sugar collection device 4, the fluidized bed device 5, the pipeline heater 6, the air duct sterilizer 7, the discharging conveyor belt 20, the blower 30, the air collecting box 31, the air filter 31, the air dehumidifier 33, the air guiding pipe 40, the induced draft fan 41, the powdered sugar collection box body 42, the air guiding discharge pipe 43, the exhaust port 44, the powder discharge port 45, the first spray pipe 46, the second spray pipe 47, the spray head 47a, the air supply pipe 50, the vibrating bed body 51, the vibrating box body 52, the vibrating sealing cover 53, the hot air inlet 54, the feeding port 55, the discharging port 56, the vibration diversion plate 520, the exhaust port 57, the powdered sugar collecting cylinder 58, the spiral flexible air duct 57a, the third temperature and humidity sensor 59;

[0025] The heating pipe housing 60, the power supply box body 61, the heating controller 62, the heating relay 63, the first flange 64, the second flange 64a, the heating pipe 65, the first temperature and humidity sensor 66, the sterilization housing 70, the flange connecting plate 70a, the air inlet connecting pipe 71, the air outlet connecting pipe 72, the ultraviolet disinfection lamp tube 73, the irradiation concave window 74, the disinfection protection lamp cover 75, the second temperature and humidity sensor 76. Specific embodiments

[0026] In order to make the purpose, technical solutions and advantages of the present utility model clearer and more understandable, the following preferred embodiments are cited with reference to the attached drawings to further elaborate on the present utility model in detail. However, it should be noted that many details listed in the specification are only for enabling the reader to have a thorough understanding of one or more aspects of the present utility model, and these aspects of the present utility model can be realized even without these specific details.

[0027] Combined with Figure 1As shown, a hot air drying system for white granulated sugar according to the present utility model, the hot air drying system includes a feeding conveyor belt 1, a vibrating screening machine 2, a blowing device 3, a powdered sugar collection device 4 and a fluidized bed device 5. The vibrating screening machine 2 is arranged below the outlet of the feeding conveyor belt 1. The discharge conveyor belt 20 directly below the vibrating screening machine 2 extends to the inlet end of the fluidized bed device 5. The air outlet of the blowing device 3 is communicated with the bottom and side of the fluidized bed device 5 through an air supply pipe 50. The top of the fluidized bed device 5 is communicated with the top of the powdered sugar collection device 4 through an air extraction pipe 40. A pipeline heater 6 is arranged on the air supply pipe 50. The blowing device 3 includes a blower 30 and an air collecting box 31. Both sides of the air collecting box 31 are provided with an air inlet and an air outlet. An air filter 32 is arranged on the pipeline where the air outlet of the air collecting box 31 is communicated with the air inlet of the blower 30. The air outlet of the blower 30 is communicated with the bottom and side of the fluidized bed device 5 through an air supply pipe 50. An air dehumidifier 33 is arranged on the air supply pipe 50 on the side close to the air outlet of the blower 30. The cold air passes through the air collecting box 31 and the air filter 32 to remove dust and moisture in the air. In the present utility model, the white granulated sugar is fed into the vibrating screening machine 2 through the feeding conveyor belt 1. The vibrating screening machine 2 evenly screens the white granulated sugar and drops it onto the discharge conveyor belt 20. The discharge conveyor belt 20 extends upward at an inclination to the feed inlet 55 of the fluidized bed device 5. The upward inclination angle of the discharge conveyor belt 20 is 15 - 30°, and the preferred angle is 20°. The blowing device 3 sends air into the fluidized bed device 5 through the air supply pipe 50. After heating the air in the air supply pipe 50 to 65 - 70°C by arranging the pipeline heater 6 on the air supply pipe 50, the hot air is sent into the fluidized bed device 5. During the flow of the white granulated sugar in the fluidized bed device 5, the hot air in the air supply pipe 50 is blown into the fluidized bed device 5 from the side and the bottom to conduct hot air drying on the white granulated sugar. The dried white granulated sugar is sent into the hopper 80 of the bucket elevator 8 from the discharge outlet of the fluidized bed device 5. The bucket elevator 8 lifts the hopper to one side of the inlet end of the packaging conveyor belt 9. The packaging conveyor belt 9 sends the dried white granulated sugar into the bagging process.

[0028] In the present utility model, in combination with Figure 1 and Figure 2As shown, the powdered sugar collection device 4 includes an induced draft fan 41 and a powdered sugar collection box body 42. The air inlet of the induced draft fan 40 is communicated with the top of the fluidized bed device 5 through an air duct 40. The air outlet of the induced draft fan 41 is communicated with the side wall at the top end of the powdered sugar collection box body 42 through an air discharge pipe 43. An exhaust port 44 is arranged at the top end of the collection box body 42, and a powder discharge port 45 is arranged at the bottom end of the collection box body 44. The outlet end of the air discharge pipe 43 extends into the powdered sugar collection box body 42 tangentially at the side wall of the top end of the powdered sugar collection box body 42. A first spray pipe 46 extending into the powdered sugar collection box body 42 is arranged around the outer walls at the top and bottom of the powdered sugar collection box body 42. A second spray pipe 47 facing the inner direction of the outlet of the induced draft fan 41 is arranged on one side of the outlet of the induced draft fan 41. A spray head 47a spraying into the induced draft fan 40 is connected to the second spray pipe 45; in the present invention, in combination with Figure 1 and Figure 2 As shown, the powdered sugar collection box body 42 is composed of a cylindrical barrel and a conical barrel integrally formed up and down. The first spray pipe 46 is arranged at the bottom end and the top end of the cylindrical barrel. An air blowing pipe 48 extending tangentially into the cylindrical barrel is arranged near the bottom end of the cylindrical barrel. The air blowing pipe 48 extends tangentially into the cylindrical barrel of the powdered sugar collection box body 42 and then extends upward and downward respectively. An air blowing control valve 48a is arranged on the air blowing pipe 48. In the present invention, the powdered sugar generated during the hot air drying process of white granulated sugar in the fluidized bed device 5 is adsorbed by the induced draft fan 41 and sent into the powdered sugar collection box body 42 tangentially through the air duct 40 and the air discharge pipe 43 for collection. As Figure 2 shown, the powdered sugar is sent tangentially into the cylindrical barrel of the powdered sugar collection box body 42 from the side wall at the top end of the cylindrical barrel of the powdered sugar collection box body 42, and spirally descends in a cyclone manner in the powdered sugar collection box body 42 into the conical barrel of the powdered sugar collection box body 42 to collect the powdered sugar. The gas during the collection process is discharged from the exhaust port 44, and the collected powdered sugar is discharged from the powder discharge port 45. After the powdered sugar is collected and discharged, a spray water pump 46a is used to send spray water into the powdered sugar collection box body 42 through the first spray pipe 46 for cleaning, and the spray water is sent into the air inlet of the induced draft fan 40 through the second spray pipe 47. The induced draft fan 40 is cleaned through the spray head 47a on the second spray pipe 47. The water for cleaning the induced draft fan 40 flows into the powdered sugar collection box body 42, and the sugar water for cleaning the inside of the powdered sugar collection box body 42 is discharged from the powder discharge port 45 for re-recycling. After the cleaning is completed, the spray water pump 46a is turned off, and the air blowing control valve 48a on the air blowing pipe 48 is opened to dry the moisture inside the powdered sugar collection box body 42 respectively.

[0029] In combination with Figure 1 and Figure 3As shown, the fluidized bed device 5 includes a vibration bed body 51, a vibration box body 52, and a vibration seal cover 53 that are integrally arranged in sequence from bottom to top. A hot air inlet 54 is provided on the side and bottom of the vibration bed body 51. The upper and lower ends of the vibration box body 52 are open. The lower end of the vibration box body 52 is detachably connected along the edge of the vibration bed body 51. The vibration seal cover 53 is detachably fixed to the upper end of the vibration box body 52. A feed inlet 55 is provided at the top of the left side wall of the vibration box body 52. A discharge outlet 56 is provided at the right end of the vibration bed body 51. At least two stages of vibration guide plates 520 that are stepped and inclined downward from the feed inlet 55 to the discharge outlet 56 are provided on the vibration box body 52. The inlet end of the lower-stage vibration guide plate 520 is connected and transitioned with the outlet end of the upper-stage vibration guide plate 520. And the inlet end of the lower-stage vibration guide plate 520 is located directly below the outlet end of the upper-stage vibration guide plate 520 and extends a certain distance in the direction of the inlet end of the upper-stage vibration guide plate 520, generally not exceeding 40 cm. The height difference between the outlet end of each stage of vibration guide plate 520 and the inlet end of the lower-stage vibration guide plate 520 does not exceed 20 cm. During the process of white sugar vibrating and falling on the vibration guide plate 520, the hot air blown by the blower 30 is sent into the vibration bed body 51 through the air supply pipe 50 to gradually dry the white sugar. At the same time, the powdered sugar in the white sugar can be continuously screened during the vibration process. A plurality of exhaust ports 57 are provided at the top of the vibration seal cover 53. A powdered sugar collection cylinder 58 is provided above the vibration seal cover 53. Each exhaust port 57 at the top of the vibration seal cover 53 is communicated with the bottom end of the powdered sugar collection cylinder 58 through a spiral flexible air pipe 57a. The discharge outlet 58a at the top of the powdered sugar collection cylinder 58 is communicated with the air inlet of the induced draft fan 40 through an induced draft pipe 40; Figure 4As shown, a plurality of third temperature and humidity sensors 59 are provided inside the vibration box body 52, and air permeable pores 521 are provided on the surface of the vibration diversion plate 520. The hot air blown into the vibrating bed body 51 can pass through the bottom of the vibration diversion plate 520 and flow into the space above the surface of the vibration diversion plate 520 from the air permeable pores 521, and then be discharged from the exhaust port 57. The third temperature and humidity sensors 59 are used to detect the temperature and humidity data inside the vibration box body 52, and the heating temperature inside the pipeline heater 6 and the air duct sterilizer 7 is adjusted according to the temperature and humidity data; The material enters from the feeding conveyor belt 1 into the feeding port 55 of the fluidized bed device 5 and reaches the vibration diversion plate 520 inside the vibration box body 52. Under the action of the high-speed hot air sent into the vibrating bed body 51 by the air supply pipe 50 and the vibration of the vibrating bed body 51, the vibration box body 52 is driven to vibrate together, so that the white granulated sugar gradually slides down from the feeding port 55 onto the vibration diversion plate 520 which is inclined downward in a stepped shape. The powdered sugar generated during the vibration process is discharged from the exhaust port 57 at the top of the vibration seal cover 53, and then reaches the powdered sugar collection box body 42 through the powdered sugar collection cylinder 58, the discharge port 58a, and the air guide pipe 40; The white granulated sugar floats and falls step by step from the vibration diversion plate 520 onto the vibrating bed body 51, and then is discharged from the discharge port 56 at the outlet end position of the vibrating bed body 51 and falls into the hopper 80 of the bucket elevator 8. The bucket elevator 8 lifts the hopper to one side of the feeding end of the packaging conveyor belt 9, and the packaging conveyor belt 9 sends the dried white granulated sugar into the bagging process.

[0030] Combined Figure 1 、 Figure 5 and Figure 6As shown in the figure, the pipeline heater 6 includes a heating pipe housing 60, a power supply box 61, a heating controller 62, and a heating relay 63. The heating controller 62 is arranged on the power supply box 61. The heating controller 62 is a PLC controller. First flange plates 64 and second flange plates 64a connected to the air supply pipe 50 are respectively arranged at the front and rear ends of the heating pipe housing 60. A plurality of heating pipes 65 are closely arranged within the circumference of the heating pipe housing 60 and arranged along the axis direction of the air supply pipe 50. The high-speed cold air flow sent by the air supply pipe 50 enters the interior of the heating pipe housing 60 from one side of the first flange plate 64 and is divided into each heating pipe 65 for heating. The heated high-speed hot air flow converges from the first flange plate 64 on the outflow side of the heating pipe housing 60 and flows at high speed towards the fluidized bed device 5. The power transmission end of the power supply box 61 is connected to the power input end of the heating pipe 65 through the heating relay 63. The control end of the heating controller 62 is connected to the control end of the heating relay 63. A first temperature and humidity sensor 66 extending into the air supply pipe 50 is arranged on one side of the second flange plate 64a. The acquisition output end of the first temperature and humidity sensor 66 is connected to the heating controller 62. Both ends of the heating pipe housing 60 are connected to the air supply pipe 50 through the first flange plate 64 and the second flange plate 64a. The heating controller 62 controls the heating power supply on the heating pipe 65 by controlling the heating relay 63. The first temperature and humidity sensor 66 is used to detect the temperature and humidity data after the high-speed hot air flow blown in is heated by the heating pipe 65, and send the temperature and humidity data after heating into the heating controller 62 for judgment and analysis to judge whether the heated high-speed hot air reaches the required temperature and humidity.

[0031] In the present invention, in combination with Figure 1 and Figure 7 As shown in the figure, an air duct sterilizer 7 is arranged on the air supply pipe 50 and on one side close to the inlet end of the fluidized bed device 5. The air duct sterilizer 7 includes a sterilization housing 70 and an ultraviolet disinfection lamp tube 73. An air inlet connecting pipe 71 and an air outlet connecting pipe 72 are respectively arranged at the front and rear ends of the sterilization housing 70. The air inlet connecting pipe 71 and the air outlet connecting pipe 72 are respectively connected to the air supply pipe 50 through flange connecting plates 70a. The ultraviolet disinfection lamp tube 73 is arranged on the inner peripheral wall or the outer peripheral wall of the sterilization housing 70. When arranged on the inner peripheral wall of the sterilization housing 70, the ultraviolet disinfection lamp tube 73 extends along the axis direction. The ultraviolet disinfection lamp tube 73 is arranged along the inner peripheral wall of the sterilization housing 70 or extends into the sterilization housing 70 from the outer wall to disinfect and sterilize the hot air. The high-speed hot air flow heated by the heating pipe 65 is further sterilized by the air duct sterilizer 7 on the air supply pipe 50 to eliminate bacteria or other pollutants carried in the hot air.

[0032] As the best embodiment of the present invention, in combination with Figure 1 、 Figure 7 and Figure 8As shown, a plurality of irradiation concave windows 74 extending in the axial direction are provided on the outer circumferential wall of the sterilization housing 70. The ultraviolet disinfection lamp tube 73 is provided outside the irradiation concave window 74. A disinfection protective lamp cover 75 detachably provided on the sterilization housing 70 is provided at the edge of the irradiation concave window 74. A second temperature and humidity sensor 76 is provided on one side of the air outlet connection pipe 72 of the sterilization housing 70. A heating plate (not shown) is provided inside the sterilization housing 70. The heating plate is arranged in the sterilization housing 70 in the radial or axial direction. The irradiation concave window 74 is an opening formed by hollowing out the outer circumferential wall of the sterilization housing 70 to the inside. A sealed transparent partition is provided at the opening position and close to the inner wall of the sterilization housing 70 to form the irradiation concave window 74. After the ultraviolet disinfection lamp tube 73 is installed in the irradiation concave window 74, the disinfection protective lamp cover 75 is used for sealing, so that the ultraviolet rays generated by the ultraviolet disinfection lamp tube 73 can be completely irradiated into the sterilization housing 70 to disinfect and sterilize the hot air passing through the sterilization housing 70. When the air temperature and humidity detected by the second temperature and humidity sensor 76 are lower than the preset temperature and humidity, a heating control instruction is output through the heating controller 62 to start the heating plate to reheat the hot air passing through the sterilization housing 70.

[0033] Combined with the figure to Figure 8 , the process of drying white granulated sugar by a hot air drying system for white granulated sugar of the present utility model will be further described: The drying process is as follows:

[0034] Step 1, the high-speed cold air blown by the blower 30 is first filtered, dehumidified, and dust-removed, and then the high-speed cold air is sent into the fluidized bed device 5 through the air supply pipe 50, so that the fluidized bed device 5 performs cold air drying during the vibration process; the moisture inside the fluidized bed is removed and internal sundries are removed through cold air drying; the cold air of the blower 30 is natural air after dehumidification, dust-removal and filtration, which avoids the situation that the white granulated sugar "gets damp" due to excessive air humidity in weather such as "returning south day".

[0035] Step 2, start the pipeline heater 6 on the air supply pipe 50 to shunt and heat the high-speed cold air, and start the air duct sterilizer 7 to sterilize the heated high-speed hot air; the sterilized high-speed hot air is sent into the bottom and side of the fluidized bed device 5 through the air supply pipe 50 to preheat the inside of the fluidized bed device 5; the high-speed cold air is shunted and heated so that the air entering the fluidized bed device is between 65-70 °C, which is used to heat the white granulated sugar. After passing through the hot air, the moisture evaporation on the surface of the white granulated sugar will be strengthened and part of the heat will be taken away.

[0036] Step 3, the heating controller 62 obtains the first temperature and humidity value (including the first humidity and the first temperature value) of the high-speed hot air heated by the pipeline heater 6 through the first temperature and humidity sensor 66, and the heating controller 62 obtains the third temperature and humidity value (including the third humidity and the third temperature value) of the high-speed hot air flow in the fluidized bed device 5 through the third temperature and humidity sensor 59, and determines whether the first temperature and humidity value is within the preset first temperature and humidity value range and whether the third temperature and humidity value is within the preset third temperature and humidity range. If the first humidity value is less than or equal to the first preset humidity value and the first temperature value is greater than or equal to the first preset temperature value, and the third humidity value is less than or equal to the third preset humidity value and the third temperature value is greater than or equal to the third preset temperature value, then the white granulated sugar is sent into the vibrating screen 2 through the feeding conveyor belt 1 for screening and falls onto the discharging conveyor belt 20, and the discharging conveyor belt 20 sends the white granulated sugar into the fluidized bed device 5; wherein, the difference between the currently detected temperature value and the preset temperature value shall not be greater than 3°C, the difference between the first temperature value and the first preset temperature value shall not exceed 3°C, and the humidity difference between the first humidity value and the preset humidity value shall not exceed 0.015%;

[0037] Step 4, during the process that white granulated sugar falls from the feed inlet 55 of the vibrating screening machine 2 onto the vibrating diversion plate 520 and gradually falls onto the vibrating bed body 51, the high-speed hot air sent into the fluidized bed device 5 by the air supply pipe 50 blows and dries the white granulated sugar; during the hot air blowing and drying process, the generated powdered sugar is sent into the powdered sugar collection device 4 through the over-draft air pipe 40 of the fluidized bed device 5 for collection, and the heating controller 62 obtains the third temperature and humidity value of the high-speed hot air flow in the fluidized bed device 5 through the third temperature and humidity sensor 59, and judges whether the third temperature and humidity value is within the range of the third preset temperature and humidity value. If the third humidity value is greater than or equal to the third preset humidity value and the third temperature value is less than or equal to the third preset temperature value, the heating controller 62 obtains the second temperature and humidity value through the second temperature and humidity sensor 76, and judges whether the second temperature and humidity value is within the range of the second preset temperature and humidity value. If it is not within the range of the second preset temperature and humidity value, that is, the second humidity value is greater than the second preset humidity value and the second temperature value is less than or equal to the second preset temperature value, then stop feeding white granulated sugar into the fluidized bed device 5 or start it, start the heating plate inside the sterilization housing 70 and reheat the hot air and remove the moisture in the hot air, and detect whether the air filter 32 and the pipeline heater 6 need maintenance; during the process that the vibrating box body 52 and the vibrating diversion plate 520 vibrate together with the vibrating bed body 51, the white granulated sugar crystals fall in segments from the vibrating diversion plate 520, and the temperature from the upper end of the vibrating box body 52 to the surface of the vibrating bed body 51 gradually increases. During the process of sliding on the vibrating diversion plate 520 with multi-stage stepped inclined connection, the first-stage hot air drying is implemented. The vibrating diversion plate 520 avoids the accumulation of white granulated sugar during vibration, and the white granulated sugar on the vibrating diversion plate 520 evenly falls onto the vibrating bed body 51. The white granulated sugar that continues to move forward with the vibration of the vibrating bed body 51 is dried in the second stage on the vibrating bed body 51; during the process that the high-speed hot air dries the white granulated sugar, the moisture on the surface of the white granulated sugar self-evaporates and takes away part of the heat, which can keep the temperature of the white granulated sugar sent out from the discharge port 56 not lower than 51-56 °C; by segmentally detecting the heating condition of the hot air, the humidity and temperature of the high-speed hot air flow are obtained, so as to ensure that the high-speed hot air flow can reduce the moisture content to the lowest during the drying process of the white granulated sugar, and prevent product quality problems such as dampness and false caking of the white granulated sugar.

[0038] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A hot air drying system for white granulated sugar, characterized in that: The hot air drying system includes a feeding conveyor belt, a vibrating screen, a blowing device, a powdered sugar collection device, and a fluidized bed device. The vibrating screen is arranged below the outlet of the feeding conveyor belt. The discharge conveyor belt directly below the vibrating screen extends to the inlet end of the fluidized bed device. The air outlet of the blowing device is communicated with the bottom and side of the fluidized bed device through an air supply pipe. The top of the fluidized bed device is communicated with the top of the powdered sugar collection device through an air extraction pipe. A pipeline heater is arranged on the air supply pipe. The blowing device includes a blower. The air outlet of the blower is communicated with the bottom and side of the fluidized bed device through an air supply pipe. An air dehumidifier is arranged on the air supply pipe on one side close to the air outlet of the blower.

2. The hot air drying system for white granulated sugar according to claim 1, wherein: The powdered sugar collection device includes an induced draft fan and a powdered sugar collection box body. The air inlet of the induced draft fan is communicated with the top of the fluidized bed device through an air extraction pipe. The air outlet of the induced draft fan is communicated with the top side wall of the powdered sugar collection box body through an air extraction discharge pipe. An exhaust port is arranged at the top of the collection box body, and a powder discharge port is arranged at the bottom of the collection box body.

3. The hot air drying system for white granulated sugar according to claim 2, wherein: The outlet end of the air extraction discharge pipe extends into the powdered sugar collection box body in a tangential direction on the top side wall of the powdered sugar collection box body. First spray pipes extending into the powdered sugar collection box body are arranged around the outer walls of the top and bottom of the powdered sugar collection box body. A second spray pipe facing the inner direction of the outlet of the induced draft fan is arranged on one side of the outlet of the induced draft fan. A nozzle spraying into the induced draft fan is connected to the second spray pipe.

4. A hot air drying system for white granulated sugar according to claim 2 or 3, characterized in that: The powdered sugar collection box body is composed of a cylindrical barrel and a conical barrel integrally formed up and down. First spray pipes are arranged at the bottom and top of the cylindrical barrel. A blowing pipe tangentially extending into the cylindrical barrel is arranged near the bottom of the cylindrical barrel. A blowing control valve is arranged on the blowing pipe.

5. A white granulated sugar hot air drying system according to claim 1, characterized in that: The blowing device further includes an air collecting box and an air filter. The two sides of the air collecting box are provided with an air inlet and an air outlet. An air filter is arranged on the pipeline where the air outlet of the air collecting box is communicated with the air inlet of the blower. The pipeline heater includes a heating pipe housing, a power supply box body, a heating controller, and a heating relay. The heating controller is arranged on the power supply box body. First flange plates and second flange plates connected to the air supply pipe are respectively arranged at the front and rear ends of the heating pipe housing. A plurality of heating pipes are closely arranged within the circumference of the heating pipe housing and arranged along the axis direction of the air supply pipe. The power transmission end of the power supply of the power supply box body is connected to the power input end of the heating pipe through the heating relay. The control end of the heating controller is connected to the control end of the heating relay.

6. The hot air drying system for white granulated sugar according to claim 5, characterized in that: A first temperature and humidity sensor extending into the air supply pipe is arranged on one side of the second flange plate. The acquisition output end of the first temperature and humidity sensor is connected to the heating controller.

7. A hot air drying system for white granulated sugar according to claim 1, characterized in that: An air duct sterilizer is arranged on the air supply pipe and close to the inlet end side of the fluidized bed device. The air duct sterilizer includes a sterilization housing and an ultraviolet disinfection lamp tube. An air inlet connecting pipe and an air outlet connecting pipe are respectively arranged at the front and rear ends of the sterilization housing. The ultraviolet disinfection lamp tube is arranged on the inner peripheral wall or outer peripheral wall of the sterilization housing.

8. A hot air drying system for white granulated sugar according to claim 7, characterized in that: A plurality of irradiation concave windows extending in the axial direction are provided on the outer peripheral wall of the sterilization housing. The ultraviolet disinfection lamp tube is arranged outside the irradiation concave window. A disinfection protection lamp cover is detachably arranged on the edge of the irradiation concave window on the sterilization housing. A second temperature and humidity sensor is arranged on one side of the air outlet connecting pipe of the sterilization housing. A heating plate is arranged inside the sterilization housing.

9. A white granulated sugar hot air drying system according to claim 2, characterized in that: The fluidized bed device includes a vibration bed body, a vibration box body and a vibration sealing cover which are integrally arranged at least in sequence from bottom to top. Hot air inlets are respectively arranged on the side part and the bottom part of the vibration bed body. The upper and lower ends of the vibration box body are open. The lower end of the vibration box body is detachably connected along the edge of the vibration bed body. The vibration sealing cover is detachably fixed at the upper end of the vibration box body. A feed inlet is arranged at the top end of the left side wall of the vibration box body. A discharge outlet is arranged at the right end of the vibration bed body. At least two levels of vibration guide plates descending in a stepwise manner from the feed inlet to the discharge outlet are arranged on the vibration box body. A plurality of exhaust ports are arranged at the top end of the vibration sealing cover. A powdered sugar collecting cylinder is arranged above the vibration sealing cover. Each exhaust port at the top end of the vibration sealing cover is communicated with the bottom end of the powdered sugar collecting cylinder through a spiral flexible air duct. The discharge outlet at the top end of the powdered sugar collecting cylinder is communicated with the air inlet of the air extraction fan through an air guiding pipe.

10. A hot air drying system for white granulated sugar according to claim 9, characterized in that: A plurality of third temperature and humidity sensors are arranged in the vibration box body. Ventilation pores are arranged on the surface of the vibration guide plate.

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