An air flow sterilization system suitable for powdery and granular materials

Abstract

The present invention discloses an air flow sterilization system suitable for powder and granular materials, comprising a sterilization device, an air flow supply device and a feeding device, wherein the sterilization device comprises a sterilization pipeline and a sterilization separator, and the sterilization pipeline is connected to the sterilization separator; the air flow supply device comprises an air flow heater, and a gas mixing nozzle is arranged at the inlet of the air flow heater, and the gas mixing nozzle is respectively connected to the steam main pipe and the air heating device, and the air heating device is connected to the sterilization separator of the sterilization device; the feeding device comprises a preheater for preheating materials and a feeding high-pressure mixing device; the feeding high-pressure mixing device is respectively connected to the air flow heater of the air flow supply device, the feeding device and the sterilization pipeline of the sterilization device. After adopting the above structure, the beneficial effects are: the system can be prevented from condensation, and the occurrence of failure phenomena such as pipe blockage can be reduced, and the sterilization effect is good, the sterilization time is short, and the composition of the material is not easily destroyed.

Description

Technical Field

[0001] The invention belongs to the technical field of material sterilization, and in particular relates to an air flow sterilization system suitable for powdery and granular materials. Background Art

[0002] Food or medicine may be contaminated in various ways during production and processing, which may lead to the generation of bacteria. In order to ensure the safety of food or medicine, it must be thoroughly sterilized. The use of appropriate sterilization technology and equipment is the key to achieving thorough sterilization.

[0003] Currently in the food and pharmaceutical industries, many materials are in powder or granular form. The sterilization devices for powder and granular materials on the market currently have the following problems:

[0004] 1. The wet heat sterilizer uses saturated steam for sterilization. Steam has large latent heat and strong penetrating power, which can easily denature bacterial proteins and kill bacteria. However, this method requires dozens of minutes of sterilization time. On the one hand, the sterilization efficiency is low, and on the other hand, long-term high-temperature heating can easily destroy beneficial protein substances in the material and the effective ingredients in the material, especially the pigments in colored materials. Long-term high-temperature heating can easily cause obvious changes in the color and appearance of the material.

[0005] 2. Ultraviolet sterilization is based on the principle of using high-energy light waves to act on bacteria, directly or indirectly destroying the RNA and protein of microorganisms, thereby killing bacteria and achieving the purpose of disinfection and sterilization. However, ultraviolet rays have low penetration ability, and the intensity of ultraviolet rays is inversely proportional to the square of the distance. The sterilization effect is poor at a location far from the light source, and its sterilization ability will also decrease with the extension of the use time. The operating cost is relatively high.

[0006] 3. The current air flow sterilization adopts moist heat sterilization or a combination of dry heat sterilization and moist heat sterilization for sterilization. However, moist heat sterilization is easy to cause pipeline blockage in some hygroscopic materials or in an environment that cannot effectively keep warm, affecting the normal production. The combination of dry and wet heat usually uses a large amount of air, which cannot give full play to the characteristics of large latent heat and strong penetration of steam, so the sterilization time is long. For example, Chinese patent document CN109010861A discloses a systematization of steam sterilization of powdered materials, which mainly sterilizes with high-temperature air (dry heat sterilization) and uses hot steam for auxiliary sterilization (moist heat sterilization). Since a large amount of air is required in the preheating stage, the steam content in the mixed gas is small, the steam partial pressure is small, and the steam heat is small under the unit sterilization gas volume, which cannot fully utilize the characteristics of strong steam penetration, and the sterilization effect is limited. The design of the sterilization chamber can extend the sterilization time and realize the sterilization function by changing the air flow velocity, but it affects the efficiency of sterilization. If it is necessary to increase the proportion of steam in the hot air and steam mixture, since the amount of air required for preheating is very large, a large amount of steam needs to be added to the sterilization system, which will cause a lot of steam waste and the structure also needs to be equipped with complex preheating pipelines.

[0007] In addition, in existing sterilization systems, cyclone separators are usually installed to separate gas and materials. Figure 1 As shown, the existing cyclone separator 100 is usually directly connected to the pipeline at the bottom. When processing powdery materials with high water content, it is easy to form material accumulation and bridging at the bottom of the cyclone separator 100, which makes the material flow unsmooth and causes blockage. Therefore, a vibration hammer 101 is usually added to the outside of the cyclone separator for vibration to make the material loose. However, the effect of this method is not ideal in actual use, especially when the moisture content of the processed material is high, this vibration method is not effective. In addition, after long-term use, the cyclone separator (the part where the vibration hammer vibrates) may be deformed. For this reason, some people have studied the use of a motor to drive the agitator to rotate to loosen the material. However, the temperature of the existing cyclone separator used for passing hot steam is usually relatively high. If the drive shaft of the motor is directly used as the agitator shaft, its heat resistance temperature is usually only about 60°C, which cannot meet the needs of actual production. If other transmission equipment is used to connect the agitator shaft, it is necessary to set up transmission structures such as sprockets and belts. Its swing structure is relatively complicated, the cost is greatly increased, and it is not conducive to later cleaning and maintenance. Therefore, it is necessary to improve it. Summary of the invention

[0008] The purpose of the present invention is to provide an air flow sterilization system suitable for powdery and granular materials, so as to ensure a good sterilization effect while greatly reducing the sterilization time, reducing the damage to the material components, and reducing the occurrence of faults such as pipe blockage.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] An air flow sterilization system suitable for powdery and granular materials, comprising:

[0011] A sterilization device for killing bacteria, the sterilization device comprising a sterilization pipeline and a sterilization separator, the outlet of the sterilization pipeline is connected to the sterilization separator;

[0012] An air flow supply device, used for providing a sterilizing air flow under process conditions, the air flow supply device includes an air flow heater, a gas mixing nozzle is arranged at the inlet of the air flow heater, used for mixing steam and hot air, and controlling the concentration of the hot air, on the one hand to reduce the amount of steam when the required gas volume is constant, and on the other hand to effectively prevent the steam from condensing and making the material wet and blocking the pipe; the gas mixing nozzle is respectively connected to the steam main pipe and the air heating device for providing hot air; the air heating device is connected to the sterilization separator of the sterilization device, used for providing power to the sterilization separator, and used for sending the material to the next process;

[0013] A feeding device is used to quantitatively supply materials, and the feeding device includes a preheater for preheating materials and a feeding high-pressure mixing device; the feeding high-pressure mixing device is connected to the airflow heater of the airflow supply device, and is used to receive the sterilized airflow that meets the process conditions and mix it with the materials; the feeding high-pressure mixing device is connected to the feeding device and is used to receive the materials; the feeding high-pressure mixing device is connected to the sterilization pipeline of the sterilization device, and is used to send the mixed high-temperature and high-pressure steam and materials into the sterilization pipeline to realize flow sterilization. After the materials and high-temperature and high-pressure steam pass through the sterilization device under high-speed airflow, instantaneous sterilization can be completed. The sterilization process usually only takes 1s-5s, which greatly reduces the sterilization time.

[0014] Furthermore, the ratio of hot air to steam is 1:9-9.5, which can ensure that the steam does not condense, thereby preventing the material from becoming wet and clogging the pipe.

[0015] According to the present invention, the airflow sterilization system also includes a solid-gas separator and a product collection device. The solid-gas separator is connected to the sterilization separator for separating materials and sterilization airflow. The product collection device is connected to the outlet of the solid-gas separator for collecting sterilized products.

[0016] Furthermore, the discharge port of the solid-gas separator is connected to a cooling device through a pipeline, and the cooling device includes a cooling filter, a cooler and a cooling blower. The cooling blower, cooler and cooling filter are connected in sequence by pipelines, and the cooling filter is connected to the solid-gas separator for cooling the material separated in the solid-gas separation device.

[0017] According to the present invention, the sterilization pipeline is a serpentine pipeline, which can travel a longer sterilization path through a shorter distance, greatly improve the space utilization rate, and solve the problem of limited space. When in use, the curvature of the pipeline can be appropriately adjusted according to the material to be sterilized, that is, the sterilization pipeline can be extended or shortened, thereby controlling the length of the sterilization time and ensuring the sterilization effect. Therefore, the sterilization time is easy to adjust. However, in the existing straight pipe installation, it is usually not easy to replace the pipeline, and its sterilization time is usually fixed and cannot be adjusted according to the sterilization requirements of the material.

[0018] According to the present invention, the feeding device also includes a feeding hopper and a feeding buffer hopper. The feeding buffer hopper is provided below the feeding hopper, and the feeding high-pressure mixing device is provided below the feeding buffer hopper. A screw conveyor is provided between the feeding hopper and the feeding buffer hopper for transporting materials, and the preheater is provided outside the screw conveyor for preheating materials; the preheater is an industrial electric blanket.

[0019] According to the present invention, the air heating device includes a sterilizing filter, an air heater and an air blower, wherein the air blower, air heater and sterilizing filter are connected in sequence, and the sterilizing filter is connected to the gas mixing nozzle for delivering the filtered and heated hot air into the gas mixing nozzle.

[0020] According to the present invention, the exhaust port of the sterilization separator is connected to the sedimentation separation tank through a pipe. The sedimentation separation tank is used to settle the dust brought out from the exhaust port of the sterilization separator. The sedimentation separation tank is connected to the air heater through a heat recovery pipe to recover heat and improve the utilization rate of heat energy.

[0021] According to the present invention, the sterilization separator includes a cyclone separator and a buffer silo arranged below the cyclone separator. After the materials are separated by the cyclone separator, they can quickly enter the buffer silo to reduce the possibility of accumulation at the straight pipe. The lower part of the cyclone separator is provided with a stirring device, and the stirring device includes a stirrer and a rotary cylinder. When in use, the stirrer is driven to rotate by the rotary cylinder to make the materials loose and prevent the materials from accumulating. The stirrer includes a stirring shaft and a thin stirring rod. The lower side of the cyclone separator is provided with a first through hole, and a dust ring or an O-ring is arranged in the first through hole. The stirring shaft of the stirrer passes through the first through hole, and the outer end of the stirring shaft is connected to the rotary cylinder, and the inner end is connected to the thin stirring rod. The materials are loosened by the swinging stirring of the thin stirring rod. At the same time, since the rotary cylinder uses compressed air as the power source, it can meet the heat resistance requirements well, can operate in an environment with a high temperature of 180°C and can work normally, and the pneumatic mechanism is easy to clean.

[0022] According to the present invention, a second through hole is further provided on the lower side of the cyclone separator, the second through hole is communicated with the first through hole, the stirring shaft passes through the second through hole and is connected to the sealing ring at the end of the long shaft. With this structure, the thin stirring rod is located in the middle of the stirring shaft, and both ends of the stirring shaft are supported, so the design strength is better, the structure is more stable, durable, and the service life is long.

[0023] According to the present invention, an end cover is further provided on the outer side of the sealing ring at the end of the long shaft, and the end cover is covered on the stirring shaft.

[0024] Furthermore, an O-ring is provided between the sealing ring at the end of the long shaft and the end cover.

[0025] According to the present invention, the agitator further comprises a shaft sleeve, and the thin agitating rod is fixedly connected to the shaft sleeve; the shaft sleeve is sleeved on the agitating shaft and fixedly connected to the agitating shaft.

[0026] Furthermore, the stirring shaft is provided with a third through hole, the shaft sleeve is provided with a fourth through hole, and a fixed cotter pin passes through the third through hole and the fourth through hole to fix the stirring shaft and the shaft sleeve together.

[0027] Furthermore, the thin stirring rod is a stainless steel wire. Since the stirring device adopts a relatively thin stainless steel wire, it has little effect on the inner cyclone of the cyclone separator, and thus does not affect the material discharge of the cyclone separator.

[0028] According to the present invention, the cyclone separator and the buffer silo are connected by a clamp, which is convenient for installation.

[0029] According to the present invention, one or more dustproof rings are installed at the rotary cylinder end of the stirring shaft to prevent dust from entering the rotary cylinder and contaminating the rotary cylinder, thereby better protecting the rotary cylinder.

[0030] According to the present invention, the outside of the cyclone separator and the buffer silo are respectively provided with a first insulation jacket and a second insulation jacket to ensure that the temperature of the materials in the cyclone separator and the buffer silo is high enough to play a heat preservation role and prevent the material temperature from lowering and condensing into wet materials.

[0031] Furthermore, the first thermal insulation jacket is provided with a first steam inlet and a first steam outlet, which are used for introducing steam and discharging steam respectively.

[0032] Furthermore, the second heat-insulating jacket is provided with a second steam inlet and a second steam outlet, which are used for introducing steam and discharging steam respectively.

[0033] According to the present invention, the O-ring, dust ring and long shaft end sealing ring are all made of high temperature resistant materials (such as fluororubber). Therefore, the stirring execution of the structure can be used in a temperature environment of 180°C.

[0034] Furthermore, a stirring device is provided at the lower part of the buffer silo.

[0035] The airflow sterilization system of the present invention is suitable for powdery and granular materials, and its beneficial effects are:

[0036] 1. Steam is mixed with a small amount of air to form mixed steam, and then heated by an airflow heater to form high-temperature and high-pressure superheated mixed steam, which increases the heat and penetration of the sterilizing airflow and improves the quality of the airflow. The material has been preheated during the transportation process, so when the sterilizing airflow is mixed with the material, no condensation will occur; at the same time, the material is sterilized by using a high-temperature and high-pressure mixed steam mixed with a small amount of hot air and further heated. The sterilization effect is equivalent to that of saturated steam sterilization, but it avoids the pipe blockage problem caused by saturated steam sterilization, and the sterilization efficiency is high. In addition, the sterilization process is completed under high wind speed conditions, and the sterilization is mainly carried out in the sterilization pipeline. The sterilization time is short, usually only a few seconds, so it basically does not affect the composition changes of the original material.

[0037] 2. The air flow sterilization system adds a small amount of hot air into the air flow supply device to prevent energy loss in the sterilization pipeline, which causes the superheated steam temperature to drop and water vapor condensation to occur, and the material aggregation to block the pipeline. Therefore, only a small amount of hot air needs to be adjusted to mix with steam and send into the gas mixing nozzle, and the amount of hot air used is small.

[0038] 3. The setting of the gas mixing nozzle can be used to adjust the concentration of superheated steam. When the required gas volume is constant, the amount of steam can also be reduced. At the same time, a preheater is set at the screw conveyor to preheat the material, which can avoid the use of air or steam. The air flow supply device is directly used, so the installation of the air preheating pipeline can be omitted. Its structure is simple, which can reduce costs and improve space utilization.

[0039] 4. The setting of gas mixing nozzle and preheater enables the air flow sterilization system to achieve steam sterilization, assisted by air sterilization, and its sterilization effect and production smoothness are greatly improved, which is specifically reflected in:

[0040] The present invention uses a mixed airflow to mix materials, and the mixing process is simple. Under high-speed airflow conditions, the flow is a turbulent airflow that directly blows the materials out of the feed high-pressure mixing device to achieve uniform solid-gas mixing, so the structure of the high-pressure mixing device is simple; in addition, the mixed gas is prepared in advance to ensure the stability and reliability of the mixed gas. When the materials are mixed, it can be ensured that the materials and the sterilized mixed gas are in accordance with the process design ratio, which is uniform and reliable;

[0041] However, in the existing method of adding steam to the solid-gas mixture, the solid-gas ratio of the mixture of preheated air and material is greatly affected by the pipeline structure and the fluctuation of airflow velocity during solid-gas transportation, and the solid-gas ratio is unstable. After entering the mixer and mixing with the steam, the mixing effect will continue to be affected by the mixer structure. At the same time, when steam is added to the solid-gas mixture, the structure of the mixing device is relatively complex, which has a greater impact on the mixing effect. Therefore, the ratio of material and sterilizing airflow is not easy to control.

[0042] 5. By setting up a heat recovery pipeline, the heat of the sterilized air flow after use can be recovered to the air heater to save energy.

[0043] 6. The structure design of the sterilization separator is ingenious. A stirring device is provided at the bottom of the cyclone separator, and the stirring device is driven by a rotary cylinder to rotate, which can make the material loose and prevent material accumulation. Especially when the water content of the material is high and it is easy to accumulate, the use of this stirring device is very important.

[0044] 7. The stirring device of the sterilization separator has a simple structure. The stirring shaft passes through the first through hole and the second through hole in sequence, so that both ends of the stirring shaft are supported. The structure has high strength and long service life, and basically does not require maintenance.

[0045] 8. The agitator of the sterilization separator adopts a thin stirring rod, which does not affect the material discharge of the cyclone separator.

[0046] 9. The sterilization separator adopts high temperature resistant sealing material, so its stirring can be used in a temperature environment of 180°C. Therefore, its stirring device can be used in humid and high ambient temperature places. After use, it can be directly sprayed with water to meet the hygiene requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the structure of an existing cyclone separator.

[0048] Figure 2 It is a schematic structural diagram of the airflow sterilization system suitable for powdery and granular materials of the present invention.

[0049] Figure 3 It is a schematic structural diagram of a cyclone separator with an anti-material bridging structure according to the present invention.

[0050] Figure 4 for Figure 3 A partial enlarged schematic diagram of part A. DETAILED DESCRIPTION

[0051] The airflow sterilization system applicable to powdery and granular materials of the present invention will be further described in detail below in conjunction with the specific drawings.

[0052] like Figure 2As shown, an air flow sterilization system suitable for powdery and granular materials of the present invention comprises:

[0053] The air flow supply device 1 is used to provide a sterilizing air flow that meets the process conditions. The air flow supply device 1 includes an air flow heater 11. The inlet of the air flow heater 11 is provided with a gas mixing nozzle 12. The gas mixing nozzle 12 is respectively connected to the steam main pipe 21 and the air heating device 3, and is used to mix steam and air to prevent steam condensation. Normally, the ratio of hot air to steam can be set at 1:9-9.5, which can ensure that the steam does not condense, thereby preventing the material from getting wet and clogging the pipe. Moreover, the sterilization effect of using the steam amount of this ratio is equivalent to that of saturated steam sterilization, and the sterilization effect is good. The steam main pipe 21 is connected to the steam source 20.

[0054] The sterilization device 5 is used to kill bacteria. The sterilization device 5 comprises a sterilization pipeline 51 and a sterilization separator 52 . The outlet of the sterilization pipeline 51 is connected to the sterilization separator 52 .

[0055] The feeding device 4 is used for quantitatively supplying materials, and the feeding device 4 includes a preheater 41 for preheating materials and a feeding high-pressure mixing device 42. The feeding high-pressure mixing device 42 is connected to the airflow heater 11 of the airflow supply device 1, and is used to receive the sterilized airflow that meets the process conditions and mix it with the materials; the feeding high-pressure mixing device 42 is connected to the feeding device 4, and is used to receive the materials; the feeding high-pressure mixing device 42 is connected to the sterilization pipeline 51 of the sterilization device 5, and is used to send the mixed high-temperature and high-pressure steam and materials into the sterilization pipeline 51 to achieve flow sterilization. After the materials and high-temperature and high-pressure steam pass through the sterilization device under high-speed airflow, instantaneous sterilization can be completed. The sterilization process usually only takes 1s-5s, which greatly reduces the sterilization time. It should be noted that the feeding high-pressure mixing device 42 can be a high-pressure rotary valve.

[0056] The air heating device 3 is used to heat the air and provide hot air. The air heating device 3 is connected to the sterilization separator 52 of the sterilization device 5 to provide power to the sterilization separator 52 to send the material to the next process.

[0057] The airflow sterilization system also includes a solid-gas separator 7 and a product collecting device 8. The solid-gas separator 7 is connected to the sterilization separator 52 for separating materials and sterilization airflow. The product collecting device 8 is connected to the discharge port of the solid-gas separator 7 for collecting sterilized products.

[0058] The discharge port of the solid-gas separator 7 is connected to the cooling device 9 through a pipeline. The cooling device 9 includes a cooling filter 91, a cooler 92 and a cooling blower 93. The cooling blower 93, the cooler 92 and the cooling filter 91 are connected by pipelines in sequence, and the cooling filter 91 is connected to the solid-gas separator 7 for cooling the materials separated in the solid-gas separator 7.

[0059] The sterilization pipeline 51 is a serpentine pipeline, which can travel a longer sterilization path through a shorter distance, greatly improve the space utilization rate, and solve the problem of limited space. When in use, the curvature of the serpentine pipeline can be appropriately adjusted according to the material to be sterilized, and the sterilization pipeline can be extended or shortened, thereby controlling the length of the sterilization time and ensuring the sterilization effect. Therefore, the sterilization time is easy to adjust. However, it is usually not easy to replace the pipeline in the existing straight pipe installation, and its sterilization time is usually fixed and unchanged, and the sterilization time cannot be adjusted according to the sterilization requirements of the material. Therefore, compared with the straight pipe, the use of corrugated curved pipes or serpentine pipes is flexible.

[0060] The feeding device also includes a feeding hopper 43 and a feeding buffer hopper 44. The feeding buffer hopper 44 is provided below the feeding hopper 43, and the feeding high-pressure mixing device 42 is provided below the feeding buffer hopper 44. A screw conveyor 45 is provided between the feeding hopper 43 and the feeding buffer hopper 44 for transporting materials. The preheater 41 is provided outside the screw conveyor 45 for preheating materials. The preheater 41 is an industrial electric blanket.

[0061] The air heating device 3 includes a sterilizing filter 31, an air heater 32 and an air blower 33. The air blower 33, the air heater 32 and the sterilizing filter 31 are connected in sequence. The sterilizing filter 31 is connected to the gas mixing nozzle 12 to send the filtered and heated hot air into the gas mixing nozzle 12. It should be noted that when the recovered heat is insufficient, the steam source 20 will provide steam to the air heater 32.

[0062] The exhaust port of the sterilization separator 52 is connected to the sedimentation separation tank 6 through a pipe. The sedimentation separation tank 6 is used to settle the dust brought out by the exhaust port of the sterilization separator 52. The sedimentation separation tank 6 is connected to the air heater 32 of the air heating device 3 through a heat recovery pipe 22 to recover heat and improve the utilization rate of heat energy.

[0063] like Figure 3 and Figure 4As shown, the sterilization separator 52 includes a cyclone separator 521 and a buffer silo 522 arranged below the cyclone separator 521. After the materials are separated by the cyclone separator 521, they can quickly enter the buffer silo 522 to reduce the possibility of accumulation in the straight pipe. A stirring device 523 is provided at the lower part of the cyclone separator 521. The stirring device 523 includes a stirrer and a rotary cylinder 5231. When in use, the stirrer is driven to rotate by the rotary cylinder 5231 to loosen the materials. The stirrer includes a stirring shaft 5232 and a thin stirring rod 5233. A first through hole is provided on the lower side of the cyclone separator 521. A dust ring 528 or an O-ring 524 is provided in the first through hole. The stirring shaft 5232 of the stirrer passes through the first through hole. The outer end of the stirring shaft 5232 is connected to the rotary cylinder 5231, and the inner end is connected to the thin stirring rod 5233. The material is loosened by the swing stirring of the thin stirring rod 5233. At the same time, since the rotary cylinder 5231 uses compressed air as the power source, it can meet the heat resistance requirements well, can operate in an environment with a high temperature of 180°C, and can also work normally. At the same time, the pneumatic mechanism is easy to clean.

[0064] The lower side of the cyclone separator 521 is also provided with a second through hole, in which a dust ring 528 or an O-ring 524 is provided, and the second through hole is communicated with the first through hole, and the stirring shaft 5232 passes through the second through hole and is connected to the long shaft end sealing ring (such as a stainless steel bearing, etc.) 525. With this structure, the thin stirring rod 5233 is located in the middle of the stirring shaft 5232, and both ends of the stirring shaft 5232 are supported, so the design strength is better, the structure is more stable, durable, and the service life is long.

[0065] An end cover 526 is further provided on the outer side of the long shaft end sealing ring 525 , and the end cover 526 covers the stirring shaft 5232 .

[0066] An O-ring 524 is provided between the long shaft end sealing ring 525 and the end cover 526 .

[0067] The agitator further comprises a shaft sleeve 5234 , and the thin agitating rod 5233 is fixedly connected to the shaft sleeve 5234 (eg, connected by welding); the shaft sleeve 5234 is disposed on the agitating shaft 5232 and fixedly connected to the agitating shaft 5232 .

[0068] The thin stirring rod 5233 is a stainless steel wire. Since the cyclone separator 521 is usually used to separate powdered materials, the stainless steel wire can be set to about 3 mm, and the stainless steel wire will not bend during the stirring process, and since the stainless steel wire is relatively thin, it will basically have no effect on the internal cyclone of the cyclone separator and will not affect the material discharge of the cyclone separator.

[0069] The stirring shaft 5232 is provided with a third through hole, the shaft sleeve 5234 is provided with a fourth through hole, and a fixing cotter pin 5235 passes through the third through hole and the fourth through hole to fix the stirring shaft 5232 and the shaft sleeve 5234 together.

[0070] The cyclone separator 521 and the buffer silo 522 are connected by a clamp 527, which is convenient for installation.

[0071] One or more dustproof rings 528 are also installed at the rotary cylinder end of the stirring shaft 5232 to further prevent dust from entering the rotary cylinder 5231 and contaminating the rotary cylinder, thereby better protecting the rotary cylinder 5231.

[0072] The outside of the cyclone separator 521 and the buffer silo 522 are respectively provided with a first insulation jacket 529 and a second insulation jacket 520 to ensure that the temperature of the materials in the cyclone separator 521 and the buffer silo 522 is high enough to play a heat preservation role and prevent the temperature of the materials from lowering and condensing into moisture.

[0073] The first heat-insulating jacket 529 is provided with a first steam inlet 5291 and a first steam outlet 5292 for introducing steam and discharging steam respectively.

[0074] The second heat-insulating jacket 520 is provided with a second steam inlet 5201 and a second steam outlet 5202 for introducing steam and discharging steam respectively.

[0075] The O-ring 524, dust ring 528, and long shaft end sealing ring 525 are all made of high temperature resistant materials (such as fluororubber). Therefore, the stirring of the structure can be used in a temperature environment of 180°C, so hot steam can pass through the interior of the cyclone separator.

[0076] It should be noted that in order to further prevent materials from accumulating at the outlet of the buffer silo, a stirring device may be provided at the bottom of the buffer silo 522. The design principle and structure of the stirring device are consistent with the structure and principle of the stirring device of the cyclone separator 521 of the present invention.

[0077] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An airflow sterilization system suitable for powdery and granular materials, characterized in that: include: A sterilization device for killing bacteria, the sterilization device comprising a sterilization pipeline and a sterilization separator, the outlet of the sterilization pipeline is connected to the sterilization separator; An air flow supply device for providing a sterilizing air flow, the air flow supply device comprising an air flow heater, a gas mixing nozzle is arranged at the inlet of the air flow heater, the gas mixing nozzle is respectively connected to a steam main pipe and an air heating device for providing hot air, and the air heating device is connected to a sterilizing separator of the sterilizing device; A feeding device for quantitatively feeding materials, the feeding device comprising a preheater for preheating materials and a feeding high-pressure mixing device; the feeding high-pressure mixing device is respectively connected to the airflow heater of the airflow supply device, the feeding device and the sterilization pipeline of the sterilization device; The sterilizing separator comprises a cyclone separator and a buffer silo arranged below the cyclone separator. A stirring device is arranged at the lower part of the cyclone separator, and the stirring device comprises a stirrer and a rotary cylinder. The stirrer comprises a stirring shaft and a thin stirring rod. A first through hole is opened on the lower side of the cyclone separator, and the stirring shaft of the stirrer passes through the first through hole. The outer end of the stirring shaft is connected to the rotary cylinder, and the inner end is connected to the thin stirring rod. The thin stirring rod is a 3 mm stainless steel wire.

2. The airflow sterilization system for powdery and granular materials as claimed in claim 1, characterized in that: The airflow sterilization system further comprises a solid-gas separator and a product collecting device. The solid-gas separator is connected to the sterilization separator, and the product collecting device is connected to the discharge port of the solid-gas separator.

3. The airflow sterilization system for powdery and granular materials as claimed in claim 2, characterized in that: The discharge port of the solid-gas separator is connected to a cooling device through a pipeline. The cooling device includes a cooling filter, a cooler and a cooling blower. The cooling blower, the cooler and the cooling filter are connected in sequence by pipelines, and the cooling filter is connected to the solid-gas separator.

4. The airflow sterilization system for powdery and granular materials as claimed in claim 1, characterized in that: The sterilization pipeline is a corrugated curved pipeline or a serpentine pipeline.

5. The airflow sterilization system for powdery and granular materials as claimed in claim 1, characterized in that: The feeding device also includes a feeding hopper and a feeding buffer hopper. The feeding buffer hopper is provided below the feeding hopper. The feeding high-pressure mixing device is provided below the feeding buffer hopper. A screw conveyor is provided between the feeding hopper and the feeding buffer hopper. The preheater is provided outside the screw conveyor, and the preheater is an industrial electric blanket.

6. The airflow sterilization system for powdery and granular materials as claimed in claim 1, characterized in that: The air heating device comprises a sterilizing filter, an air heater and an air blower. The air blower, the air heater and the sterilizing filter are connected in sequence, and the sterilizing filter is connected to a gas mixing nozzle.

7. The airflow sterilization system for powdery and granular materials as claimed in claim 6, characterized in that: The exhaust port of the sterilization separator is connected to the sedimentation separation tank through a pipeline, and the sedimentation separation tank is connected to the air heater through a heat energy recovery pipeline.

8. The airflow sterilization system for powdery and granular materials as claimed in claim 1, characterized in that: A dust ring or an O-type sealing ring is arranged in the first through hole.

9. The airflow sterilization system for powdery and granular materials as claimed in claim 8, characterized in that: The lower side surface of the cyclone separator is also provided with a second through hole, the second through hole is communicated with the first through hole, the stirring shaft passes through the second through hole, and is connected to the sealing ring at the end of the long axis.

10. The airflow sterilization system for powdery and granular materials as claimed in claim 8, characterized in that: The stirrer also includes a shaft sleeve, and the thin stirring rod is fixedly connected to the shaft sleeve; the shaft sleeve is sleeved on the stirring shaft and fixedly connected to the stirring shaft.

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