Essential oil-containing spice liquid nitrogen crushing and temperature returning treatment device and method

Abstract

The invention provides an essential oil-containing spice liquid nitrogen crushing and temperature returning treatment device and method. The device comprises an essential oil-containing spice closed anti-sticking conveying unit, a gradient temperature returning and essential oil keep-alive unit, a nitrogen circulating and essential oil micro powder recycling unit and a large-scale grading and discharging unit. Aiming at temperature recovery treatment after liquid nitrogen of essential oil-containing spices (such as Chinese prickly ash, star anise and cinnamon) is crushed, the keep-alive requirement of a burnt essential oil component is focused, an integrated structure of'closed anti-sticking conveying + double-medium gradient temperature recovery + essential oil micro-powder directional recovery + nitrogen circulation reuse 'is adopted, and continuous closed conveying of ultralow-temperature spices is realized through an anti-sticking screw rod; a 30-50 DEG C gradient hot water jacket and 25 DEG C hot nitrogen stirring are used for synergic temperature returning, the temperature returning rate is controlled to be 1-10 DEG C / min, and essential oil volatilization is inhibited; an oleophobic filtering assembly is matched to recycle essential oil micro powder, and the granularity of spices is homogenized in combination with fractional separation; and the nitrogen circulation system guarantees the production continuity.

Description

Technical Field

[0001] This invention relates to the field of spice deep processing technology, specifically a liquid nitrogen pulverization and reheating treatment device and method for essential oil-containing spices. Background Technology

[0002] The flavor and efficacy of essential oil-containing spices largely depend on their volatile essential oil components, but the reheating process after liquid nitrogen pulverization presents the following technical challenges: Significant loss of essential oils: Traditional reheating equipment is mostly open-type. When ultra-low temperature spices come into contact with air, the essential oils evaporate and oxidize due to the sudden temperature rise, resulting in a loss rate of 35%-40%. Material clumping and production blockage: Uneven heating rate causes localized melting and adhesion of essential oil particles, with a clumping rate of ≥15%, resulting in blockage in subsequent processes and a 50% reduction in production efficiency; Poor production continuity: There is no nitrogen circulation system, the batch interval is ≥30 minutes, and the single batch processing capacity is only 50-100 kg, which cannot meet the needs of large-scale production. Waste and pollution of essential oil powder: The volatile essential oil powder is emitted with the exhaust gas, which not only loses the effective ingredients, but also forms VOC pollution. Summary of the Invention

[0003] To address the problems of existing technologies, this invention provides a liquid nitrogen pulverization and reheating treatment device and method for essential oil and spice ingredients. This method features continuous operation, high retention rate, and anti-caking properties, achieving the goals of "essential oil retention rate ≥90%, single batch processing capacity ≥500kg / h, and no material blockage during production," making it suitable for large-scale production.

[0004] This invention provides a liquid nitrogen pulverization and reheating treatment device for essential oil and spice ingredients, including a sealed anti-sticking conveying unit for essential oil and spice ingredients, a gradient reheating and essential oil preservation unit, a nitrogen circulation and essential oil micro powder recovery unit, and a large-scale grading and discharge unit.

[0005] The sealed, non-sticking conveying unit containing essential oils and spices includes a liquid nitrogen pulverizing module, a gas-material pre-separation module, and a non-sticking screw conveying module. After being processed by the liquid nitrogen pulverizing module and the gas-material pre-separation module, the essential oils and spices are conveyed to the gradient reheating and essential oil preservation unit.

[0006] The gradient reheating and essential oil preservation unit includes a buffer chamber and a reheating chamber connected in sequence. The inlet of the buffer chamber is connected to a sealed, non-stick conveying unit containing essential oils and spices. A stirring device is installed inside the buffer chamber, and the top of the buffer chamber is connected to a nitrogen circulation and essential oil powder recovery unit via a stainless steel negative pressure pipe. The reheating chamber is equipped with a gradient hot water jacket module, a nitrogen stirring and reheating module, and a reheating rate control module. The gradient hot water jacket module includes a double-layer hot water jacket connected to a water circulation device, which covers the outside of the reheating chamber. The nitrogen stirring and reheating module... The system includes multiple parallel stirring shafts controlled by variable frequency motors installed inside the reheating chamber. Each shaft is equipped with several sets of stirring paddles with radial air outlets. The stirring shaft body has an axial air inlet, which is connected to the nitrogen outlet of the nitrogen circulation and essential oil powder recovery unit. A nitrogen electric heater is installed at the nitrogen outlet, and the heated nitrogen is evenly injected through the air outlet. The reheating rate control module consists of several temperature sensors embedded in the inner wall of the reheating chamber. The temperature sensors, the hot water jacket, and the nitrogen electric heater form a closed-loop control to control the reheating rate at 1-5℃ / min.

[0007] The nitrogen circulation and essential oil powder recovery unit includes an essential oil powder filtration module, a nitrogen purification module, an essential oil powder collection module, and a nitrogen compression module. The nitrogen circulation and essential oil powder recovery unit collects nitrogen from the sealed anti-stick conveying unit containing essential oils and spices, the gradient reheating and essential oil preservation unit, and after filtration and compression, it is introduced into the air outlet of the stirring shaft in the reheating chamber through a nitrogen electric heater.

[0008] The large-scale grading and discharge unit includes a grading and separation module and an exhaust gas purification module. The discharge port of the reheating chamber discharges through the grading and separation module, and the generated exhaust gas is discharged through the exhaust gas purification module.

[0009] Further improvements include an anti-sticking screw conveying module comprising a screw feeder and an anti-sticking discharge screw; the screw feeder includes a screw feeder inlet, a screw feeder outer tube, and a feeder outlet, with an internal screw connected to a first adjustable-speed motor inside the screw feeder outer tube; the liquid nitrogen pulverizing module is a liquid nitrogen pulverizer, with its outlet pipe sealed and connected to the screw feeder inlet; the gas-material pre-separation module includes a gas-material separation chamber, with its inlet connected to the feeder outlet, a nitrogen outlet at the top of the chamber, connected to a nitrogen circulation and essential oil micro-powder recovery unit via a stainless steel negative pressure pipe; the gas-material separation chamber adopts a conical bottom structure, with the bottom of the conical bottom structure connected to a gradient reheat and essential oil preservation unit via an anti-sticking discharge screw, and the anti-sticking discharge screw connected to a second adjustable-speed motor.

[0010] Further improvements include the coating of polytetrafluoroethylene and nano-ceramic composite anti-stick coating on the outer tube of the screw feeder and the inner wall of the anti-stick discharge screw.

[0011] Further improvements include setting the speed of the first and second adjustable speed motors to 15-20 r / min, and reducing the pitch of the built-in screw from 25 mm to 15 mm along the conveying direction.

[0012] In a further improvement, the hot water jacket in the gradient temperature recovery and essential oil preservation unit includes a jacket inlet and a jacket outlet. The jacket inlet and outlet are connected to a circulating water tank via stainless steel water pipes. An electric heater and a circulating water pump are installed in the circulating water tank, and a water temperature sensor is connected to the stainless steel water pipes.

[0013] In a further improvement, the nitrogen circulation and essential oil powder recovery unit includes a dual-tank parallel filter tank, a precision filter, a gas compressor, a precision filter, an adsorption dryer, and a sterile filter connected in sequence. The sterile filter is connected to the reheat chamber via a nitrogen electric heater. An oleophobic filter bag is installed in the dual-tank parallel filter tank, and a temperature sensor is installed at the outlet of the nitrogen electric heater.

[0014] In a further improvement, the grading and discharging unit includes an A separation tank and a B separation tank. The bottom of the two separation tanks is respectively provided with a separation tank outlet and a discharge pneumatic butterfly valve. The outlet of the reheating chamber is connected to the inlet of the A separation tank through a material conveying pipe. The A separation tank is provided with a separation tank exhaust port, which is connected to the B separation tank inlet. The B separation tank exhaust port is connected to the exhaust gas purification module.

[0015] In a further improvement, the exhaust gas purification module includes a dust collector connected to a negative pressure fan, and the dust collector is equipped with a dust collection filter bag.

[0016] This invention also provides a method for liquid nitrogen pulverization and reheating treatment of essential oil-containing spices, using the aforementioned liquid nitrogen pulverization and reheating treatment device, comprising the following steps: 1) The closed, non-stick conveying unit for essential oil spices pulverizes the material using a liquid nitrogen pulverizer and then conveys it to the gas-material pre-separation module, which achieves continuous separation of spices from volatile nitrogen. 2) The nitrogen separated in step 1) is transported to the nitrogen circulation and essential oil powder recovery unit; the spices separated in step 1) are transported to the buffer chamber in the gradient reheat and essential oil preservation unit. The buffer chamber stirs the material, and the nitrogen generated by stirring is transported to the nitrogen circulation and essential oil powder recovery unit. 3) The spices after stirring in the buffer chamber in step 2) are transported to the warming chamber. The warming chamber achieves a gradient temperature increase of 30°C to 50°C, with a heating rate of 1-5°C / min. During the heating process, the variable frequency motor in the warming chamber drives the stirring shaft to stir the material at a speed of 20-60 r / min. At the same time, the nitrogen circulation and essential oil powder recovery unit sprays the nitrogen recovered in step 2) into the spices evenly through the air outlet on the stirring shaft after filtration, compression and heating steps. 4) The refrigerated and stirred spices are fed into the grading and separation module through the discharge port of the reheating chamber. The A separation tank of the grading and separation module separates spice particles of ≥80 mesh as the main product, and the B separation tank separates micro powder of ≤80 mesh as the by-product. The generated waste gas is discharged after being purified by the waste gas purification module.

[0017] Further improvements are made to the filtration process in step 3) of nitrogen gas filtration, compression and heating, by using an adsorption gas dryer and a sterile filter to remove water vapor and impurities from the nitrogen gas, wherein the water vapor dew point is ≤-40℃ and the impurity precision is 0.2μm, and the essential oil powder is recovered by the essential oil powder collection module after filtration.

[0018] The beneficial effects of this invention are as follows: 1. High essential oil retention: The essential oil retention rate of spices containing essential oils is ≥93%, and the flavor difference rate between batches is ≤2%; 2. Large-scale continuous production: single batch processing capacity ≥ 500 kg / h, batch interval ≤ 5 min, production efficiency increased by 3 times; 3. No clumping or blockage: The anti-stick coating and uniform temperature recovery design result in a material clumping rate of ≤0.3%; 4. High-efficiency resource utilization: nitrogen utilization rate ≥85%, essential oil powder recovery rate ≥92%, reducing costs by 15%-20%; 5. Environmental compliance: VOCs concentration in exhaust gas ≤20mg / m³, in compliance with the "Integrated Emission Standard for Air Pollutants". Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the device structure of the present invention.

[0021] 1-Liquid nitrogen pulverizer, 2-Pulverizer discharge pipe, 3-Screw feeder inlet, 4-Screw feeder outer pipe, 5-First adjustable speed motor, 6-Gradually decreasing pitch screw, 7-Feeder outlet, 8-Conical bottom gas-material separation chamber, 9-Stainless steel feed pipe, 10-Feed inlet, 11-Nitrogen outlet, 12-Sealing cap, 13-Anti-stick discharge screw, 14-Second adjustable speed motor, 15-Buffer chamber, 16-First sealing cap, 17-Stainless steel negative pressure pipe, 18-Nitrogen arrow direction, 19-Adjustable speed stirring motor, 20-Stirring Shaft, 21-Agitator, 22-Gas flow direction of buffer chamber, 23-Filter tank inlet, 24-Dual parallel filter tank, 25-Oleophobic filter bag, 26-Sealing cover, 27-Filter tank outlet, 28-Precision filter, 29-Compressor inlet, 30-Gas compressor, 31-Adsorption dryer, 32-Sterile filter, 33-Nitrogen electric heater, 34-Temperature sensor, 35-Reheat chamber inlet, 36-Feed pneumatic butterfly valve, 37-Reheat chamber inlet, 38-Reheat chamber, 39-Hot water jacket, 40- - External insulation, 41- Dual stirring shafts, 42- Bearing seal ring, 43- Variable frequency motor, 44- Stirring shaft air inlet, 45- Stirring paddle, 46- Stirring paddle air outlet, 47- Reheating chamber air outlet, 48- Arrow direction, 49- Reheating chamber discharge outlet, 50- Reheating chamber negative pressure air inlet, 51- Pneumatic valve, 52- Jacket water inlet, 53- Jacket water outlet, 54- Stainless steel water pipe, 55- Circulating water tank inflow direction, 56- Circulating water storage tank, 57- Electric heater, 58- Circulating water pump, 59- Water temperature sensor, 60- Circulating... 61-Outflow direction of the ring water tank; 62-Material flow direction; 63-Inlet of separator A; 64-Separator A; 65-Separator B; 66-Outlet of separator; 67-Outlet pneumatic butterfly valve; 68-Sealing cover; 69-Outlet of separator; 70-Stainless steel exhaust pipe; 71-Inlet of separator B; 72-Dust collector; 73-Air inlet of dust collector; 74-Dust collector filter bag; 75-Air outlet of dust collector; 76-Negative pressure fan; 77-Negative pressure sterile filter; 78-Pressure gauge; 79-Thermometer. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] A specific embodiment of the liquid nitrogen pulverization and reheating treatment device for essential oil and spice ingredients provided by the present invention is as follows: Figure 1As shown, the system includes a liquid nitrogen pulverizer 1, a pulverizer discharge pipe 2, a screw feeder inlet 3, a screw feeder outer pipe 4, a first adjustable speed motor 5, a tapered screw 6, a feeder outlet 7, a conical bottom gas-material separation chamber 8, a stainless steel feed pipe 9, a feed inlet 10, a nitrogen outlet 11, a sealing cap 12, an anti-stick discharge screw 13, a second adjustable speed motor 14, a buffer chamber 15, a first sealing cap 16, a stainless steel negative pressure pipe 17, a nitrogen arrow indicating the direction of the nitrogen flow 18, an adjustable speed stirring motor 19, and a stirring... 20. Mixing shaft; 21. Agitator paddle; 22. Gas flow direction of buffer chamber; 23. Filter tank inlet; 24. Parallel dual-tank filter tank; 25. Oil-phobic filter bag; 26. Sealing cap; 27. Filter tank outlet; 28. Precision filter; 29. ​​Compressor inlet; 30. Gas compressor; 31. Adsorption dryer; 32. Sterile filter; 33. Nitrogen electric heater; 34. Temperature sensor; 35. Reheating chamber inlet; 36. Feed pneumatic butterfly valve; 37. Reheating chamber inlet; 38. Hot water jacket; 39. 40. External insulation; 41. Double stirring spindle; 42. Bearing seal ring; 43. Variable frequency motor; 44. Stirring shaft air inlet; 45. Stirring paddle; 46. Stirring paddle air outlet; 47. Reheating chamber air outlet; 48. Arrow direction; 49. Reheating chamber discharge port; 50. Reheating chamber negative pressure air inlet; 51. Pneumatic valve; 52. Jacket water inlet; 53. Jacket water outlet; 54. Stainless steel water pipe; 55. Circulating water tank inflow direction; 56. Circulating water storage tank; 57. Electric heater; 58. Circulating water pump; 59. Water temperature sensor; 50. Circulation. 60. Water tank outflow direction; 61. Material conveying pipe; 62. Material flow direction; 63. A separator inlet; 64. A separator; 65. B separator; 66. Separator outlet; 67. Discharge pneumatic butterfly valve; 68. Sealing cover; 69. Separator exhaust port; 70. Stainless steel exhaust pipe; 71. B separator inlet; 72. Dust collector; 73. Dust collector air inlet; 74. Dust collector filter bag; 75. Dust collector air outlet; 76. Negative pressure fan; 77. Negative pressure sterile filter; 78. Pressure gauge; 79. Thermometer.

[0024] Based on function, it mainly includes four functional units: 1. Sealed, non-stick conveying unit containing essential oils and spices Liquid nitrogen pulverizing module: The discharge pipe 2 of the liquid nitrogen pulverizer 1 is in a sealed connection with the feed port 3 of the screw feeder, with a capacity of 500 kg / h; Anti-sticking screw conveyor module: The inner wall of the outer tube 4 of the screw feeder is sprayed with "PTFE + nano-ceramic composite anti-sticking coating", the pitch of the built-in screw 6 gradually decreases from 25mm to 15mm along the conveying direction, and the speed adjustable motor 5 has a speed of 15-20r / min to prevent spices from sticking. Gas-material pre-separation module: The gas-material separation chamber 8 adopts a conical bottom structure, with an anti-stick discharge screw 13 at the bottom and a nitrogen output port 11 at the top connected to the nitrogen circulation system through a stainless steel negative pressure pipe 17 to achieve continuous separation of spices and volatile nitrogen.

[0025] 2. Gradient temperature recovery and essential oil preservation unit Buffer module: The buffer chamber has a volume of 1m³ and is equipped with a stirring device inside to stir the accumulated materials. This causes the low-temperature nitrogen gas inside to be released and then drawn away by the stainless steel negative pressure pipe connected to the buffer chamber, so that the inside of the buffer chamber is in a negative pressure oxygen-free atmosphere to avoid oxidation of essential oils. Gradient hot water jacket module: The outside of the reheating chamber 38 is covered with a double-layer hot water jacket 39. The circulating water tank 56 has two sets of 15kW electric heaters 57 and a ±0.5℃ accurate water temperature sensor 59, which can realize a gradient temperature increase from 30℃ (slightly higher than the melting point of essential oil) to 50℃ (lower than the volatilization threshold) (5℃ increase every 5 minutes); the reheating chamber 38 is connected to a negative pressure sterile filter 77, a pressure gauge 78 and a thermometer 79.

[0026] Nitrogen stirring and warming module: Two parallel stirring shafts 41 are set in the warming chamber 38, and each shaft is equipped with four sets of stirring paddles 45 with radial air outlets 46; the stirring shaft has an axial air inlet 44, and the circulating nitrogen is heated to 25°C, the stable temperature of the essential oil, by the nitrogen electric heater 33, and then evenly sprayed in through the air outlet; the variable frequency motor 43 drives the stirring shaft to run at an adjustable speed of 20r-60r / min to achieve three-dimensional uniform warming; Reheating rate control module: Four temperature sensors 34 are embedded in the inner wall of the reheating chamber, forming a closed-loop control with the hot water jacket and nitrogen electric heater, forcing the reheating rate to be stable at 1-5℃ / min.

[0027] 3. Nitrogen circulation and essential oil micro powder recovery unit Essential oil micro powder filtration module: The filter tank 24 adopts a dual-tank parallel structure (the filtration area of ​​a single tank is 20㎡), and is filled with a 0.5μm oleophobic polypropylene filter bag 25 to achieve continuous filtration; Nitrogen purification module: Adsorption gas dryer 31 + sterile filter 32 removes water vapor (dew point ≤ -40℃) and impurities (accuracy 0.2μm) from nitrogen; Essential oil micro powder collection module: A drawer-type collection box is set at the bottom of the filter tank to collect essential oil micro powder (accounting for 3%-5% of the finished product) every 2 hours and re-blend it into the main product; Nitrogen compression module: A 20m³ / h screw gas compressor 30 compresses purified nitrogen to 0.12MPa and circulates it to the nitrogen electric heater.

[0028] 4. Large-scale grading and discharge unit The grading and separation module: Separator A, tank 64, separates spice particles ≥80 mesh (main product); Separator B, tank 65, separates micro powder ≤80 mesh (by-product); the material is continuously discharged through the pneumatic butterfly valve 67. Exhaust gas purification module: Dust collector 72 is equipped with 20㎡ dust filter bag 74, and the residual essential oil powder is intercepted by negative pressure fan 76 to ensure that the VOCs concentration of exhaust gas is ≤20mg / m³.

[0029] The method for treating essential oil-containing spices using the aforementioned liquid nitrogen pulverization and reheating treatment device includes the following steps: 1) The closed, non-stick conveying unit for essential oil spices pulverizes the material using a liquid nitrogen pulverizer and then conveys it to the gas-material pre-separation module, which achieves continuous separation of spices from volatile nitrogen. 2) The nitrogen separated in step 1) is transported to the nitrogen circulation and essential oil powder recovery unit; the spices separated in step 1) are transported to the buffer chamber in the gradient reheat and essential oil preservation unit. The buffer chamber stirs the material, and the nitrogen generated by stirring is transported to the nitrogen circulation and essential oil powder recovery unit. 3) The spices stirred in the buffer chamber of step 2) are transported to the reheating chamber, where a gradient temperature increase of 30°C to 50°C is achieved at a rate of 1-5°C / min. During the heating process, the variable frequency motor in the reheating chamber drives the stirring shaft to stir the material at a speed of 20-60 r / min. Simultaneously, the nitrogen circulation and essential oil powder recovery unit sprays the nitrogen recovered in step 2) into the spices evenly through the vent on the stirring shaft after filtration, compression, and heating. The filtration process in the nitrogen filtration, compression, and heating steps removes water vapor and impurities from the nitrogen using an adsorption gas dryer and a sterile filter, where the water vapor dew point is ≤-40°C and the impurity precision is 0.2μm. After filtration, the essential oil powder is recovered through the essential oil powder collection module. 4) The refrigerated and stirred spices are fed into the grading and separation module through the discharge port of the reheating chamber. The A separation tank of the grading and separation module separates spice particles of ≥80 mesh as the main product, and the B separation tank separates micro powder of ≤80 mesh as the by-product. The generated waste gas is discharged after being purified by the waste gas purification module.

[0030] The following uses Sichuan peppercorn powder as an example to provide a specific implementation method for Sichuan peppercorn powder: Continuous crushing and conveying: Dried peppercorns are crushed to 100 mesh by a liquid nitrogen crusher (500 kg / h) and conveyed to the gas-material separation chamber by a screw feeder (18 r / min) to separate nitrogen containing essential oil powder; Gradient reheating: The buffer chamber is designed with a stirring device to stir the material, so that the low-temperature nitrogen in the accumulated material is released and drawn away by the stainless steel negative pressure pipe connected to the buffer chamber. The pepper powder enters the reheating chamber; the hot water jacket gradually increases the temperature from 30°C to 50°C, and the 25°C hot nitrogen is sprayed out by the stirring paddle. The reheating rate is 1°C / min, and the material is reheated from -196°C to 25°C. Nitrogen circulation and essential oil recovery: Nitrogen containing essential oil powder is filtered by a dual-canister filter to trap the powder, purified, and then compressed and circulated; the collection box recovers the powder and reconstitutes it every 2 hours. Graded discharge: After being reheated, the pepper powder is graded in an A / B separator and continuously discharged to the packaging stage; the exhaust gas is purified by a dust collector before being discharged.

[0031] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, for the device embodiments, the above descriptions are merely preferred embodiments of the present invention. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple, and relevant parts can be referred to the descriptions of the method embodiments. The above descriptions are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention, without departing from the principle of the present invention, should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A liquid nitrogen pulverization and reheating treatment device for essential oil and spice ingredients, characterized in that: It includes a closed, non-stick conveying unit for essential oils and spices, a gradient temperature recovery and essential oil preservation unit, a nitrogen circulation and essential oil micro powder recovery unit, and a large-scale grading and discharge unit. The closed, non-sticking conveying unit containing essential oils and spices includes a liquid nitrogen pulverizing module, a gas-material pre-separation module, and a non-sticking screw conveying module. After being processed by the liquid nitrogen pulverizing module and the gas-material pre-separation module, the essential oils and spices are conveyed to the gradient reheating and essential oil preservation unit. The gradient reheating and essential oil preservation unit includes a buffer chamber (15) and a reheating chamber (38) connected in sequence; the inlet of the buffer chamber (15) is connected to a sealed anti-sticking conveying unit containing essential oils and spices, and the buffer chamber (15) is equipped with a stirring device inside. The top of the buffer chamber (15) is connected to a nitrogen circulation and essential oil micro powder recovery unit through a stainless steel negative pressure pipe (17); the reheating chamber (38) is equipped with a gradient hot water jacket module, a nitrogen stirring reheating module and a reheating rate control module. The gradient hot water jacket module includes a double-layer hot water jacket (39) connected to a water circulation device, and the double-layer hot water jacket (39) covers the outside of the reheating chamber (38); the nitrogen stirring reheating module includes a module installed in the reheating chamber. (38) contains multiple parallel stirring spindles (41) controlled by variable frequency motors (43). Each spindle is equipped with several sets of stirring paddles (45) with radial air outlets (46). The stirring spindle (41) has an axial air inlet (44) on its shaft. The air outlet (46) is connected to the nitrogen outlet of the nitrogen circulation and essential oil powder recovery unit. A nitrogen electric heater (33) is provided at the nitrogen outlet. The heated nitrogen is evenly sprayed in through the air outlet (46). The temperature recovery rate control module consists of several temperature sensors (34) embedded in the inner wall of the temperature recovery chamber. The temperature sensors (34), hot water jacket (39), and nitrogen electric heater (33) form a closed-loop control to control the temperature recovery rate to 1-5℃ / min. The nitrogen circulation and essential oil powder recovery unit includes an essential oil powder filtration module, a nitrogen purification module, an essential oil powder collection module, and a nitrogen compression module. The nitrogen circulation and essential oil powder recovery unit collects nitrogen from the closed anti-stick conveying unit containing essential oil spices, the gradient reheating and essential oil preservation unit, and after filtration and compression, it is introduced into the air outlet (46) of the stirring main shaft (41) in the reheating chamber (38) through the nitrogen electric heater (33). The large-scale grading and discharge unit includes a grading and separation module and a waste gas purification module. The discharge port of the reheating chamber (38) discharges through the grading and separation module, and the generated waste gas is discharged through the waste gas purification module.

2. The liquid nitrogen pulverization and reheating treatment device for essential oil and spice ingredients according to claim 1, characterized in that: The anti-sticking screw conveying module includes a screw feeder and an anti-sticking discharge screw (13); the screw feeder includes a screw feeder inlet (3), a screw feeder outer tube (4), and a feeder outlet (7), and the screw feeder outer tube (4) is equipped with an internal screw (6) connected to the first adjustable speed motor (5); the liquid nitrogen pulverizing module is a liquid nitrogen pulverizer (1), and the discharge pipe (2) of the liquid nitrogen pulverizer (1) is in sealed communication with the screw feeder inlet (3); the gas-material pre-separation module includes The gas-material separation chamber (8) is connected to the feeder outlet (7). A nitrogen outlet (11) is provided at the top of the gas-material separation chamber (8). The nitrogen outlet (11) is connected to the nitrogen circulation and essential oil powder recovery unit through a stainless steel negative pressure pipe (17). The gas-material separation chamber (8) adopts a conical bottom structure. The bottom of the conical bottom structure is connected to the gradient temperature recovery and essential oil preservation unit through an anti-stick discharge screw (13). The anti-stick discharge screw (13) is connected to a second adjustable speed motor (14).

3. The liquid nitrogen pulverization and reheating treatment device for essential oil and spice ingredients according to claim 2, characterized in that: The outer tube (4) of the screw feeder and the inner wall of the anti-stick discharge screw (13) are both coated with a polytetrafluoroethylene and nano-ceramic composite anti-stick coating.

4. The liquid nitrogen pulverization and reheating treatment device for essential oil and spice ingredients according to claim 2 or 3, characterized in that: The first adjustable speed motor (5) and the second adjustable speed motor (14) have a speed of 15-20 r / min, and the pitch of the built-in screw (6) gradually decreases from 25 mm to 15 mm along the conveying direction.

5. The liquid nitrogen pulverization and reheating treatment device for essential oil and spice ingredients according to claim 1, characterized in that: The hot water jacket (39) in the gradient temperature recovery and essential oil preservation unit includes a jacket inlet (52) and a jacket outlet (53). The jacket inlet (52) and the jacket outlet (53) are connected to the circulating water tank (56) respectively through a stainless steel water pipe (54). An electric heater (57) and a circulating water pump (58) are installed in the circulating water tank (56). A water temperature sensor (59) is connected to the stainless steel water pipe (54).

6. The liquid nitrogen pulverization and reheating treatment device for essential oil and spice ingredients according to claim 1, characterized in that: The nitrogen circulation and essential oil powder recovery unit includes a dual-tank parallel filter tank (24), a precision filter (28), a gas compressor (30), a precision filter (28), an adsorption dryer (31), and a sterile filter (32) connected in sequence. The sterile filter (32) is connected to the reheat chamber (38) through a nitrogen electric heater (33). An oleophobic filter bag (25) is provided in the dual-tank parallel filter tank (24), and a temperature sensor (34) is provided at the outlet of the nitrogen electric heater (33).

7. The liquid nitrogen pulverization and reheating treatment device for essential oil and spice ingredients according to claim 1, characterized in that: The grading and discharge unit includes an A separation tank (64) and a B separation tank (65). The bottom of the two separation tanks is provided with a separation tank outlet (66) and a discharge pneumatic butterfly valve (67). The outlet of the reheating chamber (38) is connected to the inlet of the A separation tank (64) through a material conveying pipe (61). The A separation tank (64) is provided with a separation tank exhaust port (69), which is connected to the B separation tank inlet (71) of the B separation tank (65). The exhaust port of the B separation tank (65) is connected to the waste gas purification module.

8. The liquid nitrogen pulverization and reheating treatment device for essential oil spices according to claim 1 or 7, characterized in that: The exhaust gas purification module includes a dust collector (72) connected to a negative pressure fan (76), and a dust collector filter bag (74) is installed inside the dust collector (72).

9. A method for liquid nitrogen pulverization and reheating treatment of essential oil-containing spices, comprising the liquid nitrogen pulverization and reheating treatment apparatus for essential oil-containing spices as described in any one of claims 1-8, characterized in that... Includes the following steps: 1) The closed, non-stick conveying unit for essential oil spices uses a liquid nitrogen pulverizer to pulverize the material and then conveys it to the gas-material pre-separation module, which realizes the continuous separation of spices and volatile nitrogen. 2) The nitrogen separated in step 1) is transported to the nitrogen circulation and essential oil powder recovery unit; the spices separated in step 1) are transported to the buffer chamber (15) in the gradient temperature recovery and essential oil preservation unit. The buffer chamber (15) stirs the material, and the nitrogen generated by stirring is transported to the nitrogen circulation and essential oil powder recovery unit. 3) The spices after stirring in the buffer chamber (15) in step 2) are transported to the warming chamber (38). The warming chamber (38) achieves a gradient temperature increase from 30°C to 50°C, with a heating rate of 1-5°C / min. During the heating process, the variable frequency motor (43) in the warming chamber (38) drives the stirring shaft to stir the material at a speed of 20r-60r / min. At the same time, the nitrogen circulation and essential oil powder recovery unit sprays the nitrogen recovered in step 2) into the spices evenly through the air outlet (46) on the stirring main shaft (41) after filtration, compression and heating steps. 4) The outlet of the reheating chamber (38) feeds the reheated and stirred spices into the grading and separation module. The A separation tank (64) of the grading and separation module separates spice particles of ≥80 mesh as the main product, and the B separation tank (65) separates micro powder of ≤80 mesh as the by-product. The generated waste gas is discharged after being purified by the waste gas purification module.

10. The liquid nitrogen pulverization and reheating treatment method for essential oil-containing spices according to claim 9, characterized in that: In step 3), the filtration process in the nitrogen filtration, compression and heating steps removes water vapor and impurities from the nitrogen through an adsorption gas dryer (31) and a sterile filter (32), wherein the water vapor dew point is ≤-40℃ and the impurity precision is 0.2μm. After filtration, the essential oil powder is recovered through the essential oil powder collection module.

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