Dynamic closed cycle drying system
By using a dynamic closed-loop drying system with nitrogen protection and heat recovery, the problems of oxidative rancidity and low heat utilization in the drying process of Antarctic krill powder have been solved, achieving a high-efficiency and low-consumption drying effect and ensuring product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2026-04-10
AI Technical Summary
Existing shipborne drying technologies suffer from problems such as oxidative rancidity, material loss and dust pollution, and low thermal energy utilization, especially in the drying process of Antarctic krill powder.
The system employs a dynamic closed-loop circulation drying system, which includes a control system, an induced draft fan, circulating ventilation ducts, a heat recovery mechanism, an electric heating box, a settling tower, and an axial flow mixing box. Through nitrogen protection and heat recovery, the oxygen concentration is precisely controlled. Combined with the axial flow mixing blade design, this achieves efficient and low-consumption drying of shrimp powder raw materials.
It effectively inhibits the oxidation of krill lipids, ensures product quality, improves thermal energy utilization, reduces energy consumption, and minimizes material loss and dust pollution.
Smart Images
Figure CN224108520U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The novel belongs to the technical field of marine biological resource processing equipment, and particularly relates to a dynamic closed-circuit drying system. BACKGROUND
[0002] As an important biological resource in the Antarctic sea area, Antarctic krill is rich in high-quality protein, unsaturated fatty acids and various bioactive substances (such as astaxanthin), and is a high-value raw material in the fields of food, health care products and feed.
[0003] At present, the shipborne drying technology mainly adopts hot air drying or vacuum disc drying. Although the hot air drying has high efficiency, the open system design is easy to introduce oxygen, which leads to oxidation and spoilage of unsaturated fatty acids, and the shrimp powder is easy to scatter under high wind speed, causing material loss and dust pollution. Although the vacuum disc drying can reduce energy consumption, the cycle is long, the material is repeatedly dried and humidified, and the quality of the shrimp powder is significantly reduced. In addition, the existing closed-circuit drying system lacks an efficient heat energy distribution mechanism, resulting in low heat energy utilization rate and high energy consumption. CONTENT OF THE NEW TYPE
[0004] The novel discloses a dynamic closed-circuit drying system, which aims to realize efficient, low-consumption and nutrient-preserving drying of Antarctic krill shrimp powder raw materials.
[0005] To achieve the above-mentioned purpose, the technical scheme of the novel is as follows:
[0006] A dynamic closed-circuit drying system, comprising: a control system, an air induction fan, a circulating ventilation pipeline, a heat energy recovery mechanism, an electric heating box, a settling tower, an axial flow stirring box and a sensor unit, wherein the air induction fan, the axial flow stirring box, the settling tower, the heat energy recovery mechanism and the electric heating box are connected in series through the circulating ventilation pipeline, the circulating ventilation pipeline is provided with a nitrogen gas input pipe and an exhaust valve, the drying system is internally provided with the sensor unit, the control system is connected with the sensor unit through a wire signal, and the control system is configured to control the operation of the drying system.
[0007] Preferably, the axial flow stirring box comprises a cylindrical shell, a stirring shaft is arranged in the shell in the axial direction, both ends of the stirring shaft are rotatably connected with both ends of the shell, one end of the stirring shaft penetrates through the shell and is connected with a first driving motor, a plurality of groups of first stirring blades and second stirring blades are distributed on the stirring shaft at intervals, each group of the first stirring blades and the second stirring blades has a plurality of blade bodies and is uniformly distributed about the stirring shaft, the first stirring blades have a certain angle about the axis of the stirring shaft and the plane in the radial direction, and the first stirring blades satisfy the condition that the moving direction of the shrimp powder raw material in the shell is opposite when the first driving motor is in forward rotation and reverse rotation, and the second stirring blades are parallel to the axis of the stirring shaft and the plane in the radial direction at the position of the second stirring blades, that is, the second stirring blades drive the shrimp powder raw material to move circumferentially around the stirring shaft.
[0008] Preferably, the top end of the shell is provided with a feeding port, the feeding port is provided with a screw conveyor, the screw conveyor is connected with a raw material container at the end away from the feeding port, and the output port of the screw conveyor is opposite to the feeding port; the bottom of the shell is provided with a discharging port at the side away from the feeding port, and the discharging port is provided with an electric door.
[0009] Preferably, the top of the shell where the discharging port is located is provided with a ventilation port, the settling tower comprises a cylindrical shell, the bottom end of the cylindrical shell is sealingly and fixedly connected with the ventilation port, the top end of the cylindrical shell is provided with a sealing cover, the top of the side wall of the cylindrical shell is provided with an exhaust port, and the exhaust port is provided with a filter screen.
[0010] Preferably, the side wall of the shell near the end of the screw conveyor is provided with an air inlet, and the air inlet and the exhaust port are connected with a circulating ventilation pipeline.
[0011] Preferably, the heat energy recovery mechanism comprises a condenser set connected with the water cooling machine and a heat exchanger, the heat exchanger is a finned heat exchanger, the condenser set and the heat exchanger are connected through a pipeline, and the condensing pipe of the condenser set and the heat exchange pipe of the finned heat exchanger are connected in series and then connected with the water cooling machine.
[0012] Preferably, the electric heating box comprises a box shell connected in series on the circulating ventilation pipeline, and the box shell is provided with a heating assembly.
[0013] Preferably, the sensor unit comprises oxygen concentration sensors, temperature and humidity sensors and air pressure sensors arranged on the inner walls of the axial flow stirring box, the settling tower and the circulating ventilation pipeline.
[0014] Preferably, electromagnetic valves are arranged on the nitrogen input pipe and the circulating ventilation pipeline respectively, and the nitrogen input pipe is connected with a nitrogen generator.
[0015] The dynamic closed loop drying system has the following advantages:
[0016] 1. The existing closed loop system has poor air tightness, low oxygen concentration control precision (usually > 5%), and cannot effectively inhibit the oxidation of phosphorus shrimp lipid, resulting in a decrease in product quality; the closed loop drying system of the present application can accurately control the oxygen concentration to < 2.0%, effectively prevent the oxidation of phosphorus shrimp lipid, and ensure the product quality.
[0017] 2. The present application can automatically and dynamically dry shrimp powder raw materials, effectively improve the heat energy utilization rate, and save the occupied space. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is a top view structural schematic diagram of the present application;
[0019] Figure 2 This is a front view structural diagram of the present invention;
[0020] Figure 3 This is a schematic diagram of the structure of this novel heat recovery mechanism.
[0021] The diagram shows the following markings: 1. Raw material container; 2. Screw conveyor; 3. Axial flow mixing tank; 31. Outer shell; 32. Mixing blades; 321. First mixing blade; 322. Second mixing blade; 4. Settling tower; 5. Air inlet; 6. Circulating ventilation duct; 7. Sealing fan; 71. Exhaust duct; 72. Air inlet duct; 8. Drive motor of screw conveyor; 9. Sealing cover; 10. Hopper; 11. Nitrogen input pipe; 12. Exhaust valve; 13. Heat recovery mechanism; 131. Condenser unit; 1311. Condenser tube; 132. Heat exchanger; 1321. Heat exchange tube; 14. Electric heating box; 15. Pipeline. Detailed Implementation
[0022] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
[0023] The following embodiments can be understood as a part of the local structure or method of the present invention, or as a combination of embodiments to explain the connotation of a larger range of structures or methods of the present invention.
[0024] Example 1
[0025] A dynamic closed-loop drying system, such as Figures 1-3 As shown, the system includes: a control system, an induced draft fan (not shown in the figure, used to provide airflow power to the drying system), a circulating ventilation duct 6, a heat recovery mechanism 13, an electric heating box 14, a settling tower 4, an axial flow mixing box 3, and a sensor unit. The induced draft fan, axial flow mixing box 3, settling tower 4, heat recovery mechanism 13, and electric heating box 14 are connected in series through the circulating ventilation duct 6. The circulating ventilation duct 6 is equipped with a nitrogen input pipe 11 and an exhaust valve 12. The drying system is equipped with a sensor unit inside. The control system is connected to the sensor unit via a wire signal and is configured to control the operation of the drying system.
[0026] Example 2
[0027] like Figure 1 , 2As shown, the axial flow stirring box 3 includes a cylindrical shell 31, an axial stirring shaft (not marked in the figure) is arranged in the shell 31, the two ends of the stirring shaft are rotatably connected with the two ends of the shell 31, one end of the stirring shaft penetrates the shell and is connected with a first driving motor (not marked in the figure), a plurality of groups of first stirring blades 321 and second stirring blades 322 are uniformly distributed on the stirring shaft, each group of the first stirring blades 321 and the second stirring blades 322 has a plurality of blade bodies and is uniformly distributed about the stirring shaft, the first stirring blades 31 have a certain angle about the axis of the stirring shaft and the plane in which the radial direction lies (i.e. axial flow blades arranged around the stirring shaft), and satisfy that the first driving motor can drive the shrimp powder raw materials to move in opposite directions in the shell 31 when the first driving motor is rotated forward and reversed, the second stirring blades 322 are parallel to the axis of the stirring shaft and the plane in which the radial direction lies at the position, that is, the second stirring blades drive the shrimp powder raw materials to move circumferentially around the stirring shaft (i.e. in the process of stirring, the shrimp powder raw materials can not only move around the stirring shaft, but also move forward or backward, so that the raw materials can be fully contacted with hot nitrogen gas and quickly dried).
[0028] Example 3
[0029] As shown in Figure 1 , 2 , the top end of the shell 31 is provided with a feeding port (not marked in the figure), the feeding port is provided with a screw conveyor 2, the end of the screw conveyor 2 away from the feeding port is connected with a raw material container 1, the output port of the screw conveyor 2 is opposite to the feeding port, that is, the shrimp powder raw materials are input into the axial flow stirring box; the bottom of the shell 31 away from the feeding port is provided with a discharge port (not shown in the figure), the discharge port is provided with an electric door, after drying for a certain time, when the humidity reaches the set value range, the electric door can be opened to discharge the materials, at this time, the rotation direction of the stirring shaft is controlled to make the shrimp powder discharged from the discharge port.
[0030] As shown in Figure 1 , 2 , the top of the shell 31 above the discharge port is provided with a ventilation port (not marked in the figure), the settling tower 4 includes a cylindrical shell, the bottom end of the cylindrical shell is sealingly and fixedly connected with the ventilation port, the top end of the cylindrical shell is provided with a sealing cover 9, the sidewall top of the cylindrical shell is provided with an exhaust port (not marked in the figure), the exhaust port is provided with a filter screen (to avoid the shrimp powder being discharged), the settling tower is used to settle the suspended shrimp powder raw materials, after drying is completed, the shrimp powder is automatically settled into the axial flow stirring box.
[0031] As shown in Figure 1 , 2 , the sidewall of the shell 31 near one end of the screw conveyor 2 is provided with an air inlet 5, the air inlet 5 and the exhaust port are connected with a circulating ventilation pipeline 6.
[0032] Example 4
[0033] As Figures 1-3 shown, the heat energy recovery mechanism 13 includes a condenser unit 131 connected with a water cooling machine (not shown in the figure) and a heat exchanger 132, the heat exchanger 132 is a finned heat exchanger, the condenser unit 131 and the heat exchanger 132 are connected through a pipeline 15, the condensing pipe 1311 of the condenser unit 131 is connected in series with the heat exchange pipe 1321 of the finned heat exchanger, and then connected with the water cooling machine. It can be understood that when hot nitrogen gas flows into the condenser unit, the moisture in the hot nitrogen gas is discharged from the drying system due to condensation, and the nitrogen gas is also cooled down, and the water in the condensing pipe is heated and enters the heat exchange pipe, and then exchanges heat with the nitrogen gas in the heat exchanger, and the temperature of the nitrogen gas is also raised, that is, the heat energy recovery is realized.
[0034] As Figure 1 shown, the electric heating box 14 includes a box shell connected in series on the circulating ventilation pipeline, and a heating assembly (not shown in the figure) is arranged in the box shell. The heating assembly continues to heat the nitrogen gas to make up for the heat loss caused by condensation.
[0035] Example 5
[0036] As Figure 1 , 2 shown, the sensor unit (not shown in the figure) includes oxygen concentration sensors, temperature and humidity sensors, and air pressure sensors arranged on the inner walls of the axial flow stirring box 3, the settling tower 4, and the circulating ventilation pipeline 6.
[0037] As Figure 1 shown, the nitrogen gas input pipe 11 and the circulating ventilation pipeline 6 are respectively provided with electromagnetic valves, and the nitrogen gas input pipe 11 is connected with a nitrogen generator (not shown in the figure).
[0038] The present application can make hot nitrogen gas circulate in the drying system and reduce the oxygen concentration to below the set value, avoid lipid oxidation during shrimp powder drying, ensure the drying quality of shrimp powder, and greatly reduce heat energy loss and improve heat energy utilization rate through the heat energy recovery mechanism. The axial flow stirring box can move the shrimp powder raw material in the circumferential direction and also move it back and forth along the axial direction of the stirring shaft, which greatly improves the drying efficiency.
Claims
1. A dynamic closed loop drying system characterized by: It comprises a control system, an air induction fan, a circulating ventilation pipeline, a heat energy recovery mechanism, an electric heating box, a settling tower, an axial flow stirring box and a sensor unit. The axial flow stirring box comprises a cylindrical shell, an axial stirring shaft arranged in the shell, two ends of the stirring shaft being rotatably connected to two ends of the shell, one end of the stirring shaft penetrating the shell and being connected to a first driving motor, a plurality of groups of first stirring blades and second stirring blades being arranged on the stirring shaft, each group of the first stirring blades and the second stirring blades comprising a plurality of blade bodies and being uniformly distributed about the stirring shaft, the first stirring blades having a certain angle about the axial line of the stirring shaft and a radial plane, and the first stirring blades being able to drive the shrimp powder raw materials to move in opposite directions when the first driving motor is rotated in opposite directions, and the second stirring blades being parallel to the axial line of the stirring shaft and the radial plane at the positions of the second stirring blades, i.e. the second stirring blades driving the shrimp powder raw materials to move circumferentially about the stirring shaft.
2. A dynamic closed cycle drying system as claimed in claim 1, characterized in that: A feeding port is arranged on one side of the top end of the shell, a screw conveyor is arranged in the feeding port, a raw material container is connected to one end of the screw conveyor away from the feeding port, and the output port of the screw conveyor is opposite to the feeding port.
3. A dynamic closed cycle drying system as claimed in claim 2, characterised in that: An exhaust port is arranged on one side of the bottom of the shell away from the feeding port.
4. A dynamic closed cycle drying system as claimed in claim 3, characterised in that: A ventilation port is arranged on the top of the shell above the exhaust port.
5. A dynamic closed cycle drying system as claimed in claim 4, characterised in that: An air inlet is arranged on the side wall of the shell close to one end of the screw conveyor.
6. A dynamic closed cycle drying system as claimed in claim 5, characterised in that: The heat energy recovery mechanism comprises a condenser set and a heat exchanger connected to a water cooling machine, the heat exchanger is a finned heat exchanger, the condenser set and the heat exchanger are connected by a pipeline, and the condensing pipe of the condenser set and the heat exchange pipe of the finned heat exchanger are connected in series and then connected to the water cooling machine.
7. A dynamic closed cycle drying system as claimed in claim 6, characterised in that: The electric heating box comprises a box shell connected in series in the circulating ventilation pipeline, and a heating assembly is arranged in the box shell.
8. A dynamic closed cycle drying system as claimed in claim 7, characterised in that: The sensor unit comprises oxygen concentration sensors, temperature and humidity sensors and air pressure sensors arranged on the inner walls of the axial flow stirring box, the settling tower and the circulating ventilation pipeline.
9. A dynamic closed cycle drying system as claimed in claim 8, characterised in that: Electromagnetic valves are arranged on the nitrogen input pipe and the circulating ventilation pipeline, respectively, and a nitrogen generator is connected to the nitrogen input pipe.