A slice drying device with nylon 66 wet slice preheating structure
By preheating the wet Nylon 66 chips, the problems of unstable temperature in the drying tower and uneven moisture content in the dry chips were solved, thereby improving stability and efficiency, while also achieving energy reuse and energy-saving effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG NANSHAN TEXTILE GARMENT
- Filing Date
- 2025-06-13
- Publication Date
- 2026-05-29
AI Technical Summary
In the existing technology, the temperature of wet nylon 66 chips entering the drying tower is unstable, resulting in temperature fluctuations in the drying tower and uneven moisture content of the dry chips, which affects drying efficiency and energy saving effect.
The slicing and drying device adopts a nylon 66 wet slice preheating structure. By setting a nitrogen distributor in the buffer chamber, the waste heat of the return gas at the top of the drying tower is used to preheat the wet slices, ensuring the temperature stability of the wet slices entering the drying tower. The air volume is adjusted by the PLC control system to achieve uniform preheating.
It improves the operational stability of the drying tower and the uniformity of the dried slices, shortens the drying time, increases the drying efficiency, and achieves secondary energy utilization and energy-saving effects.
Smart Images
Figure CN224302515U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical fiber production technology, and in particular to a slicing drying device with a nylon 66 wet slicing preheating structure. Background Technology
[0002] Nylon 66 fiber is widely used in textiles, apparel, industry, home furnishings, automotive manufacturing, and protective applications due to its excellent properties such as high strength, abrasion resistance, heat resistance, and chemical stability. Chip drying is a crucial step in the indirect spinning production of nylon 66 fiber, and its drying effect is closely related to product quality.
[0003] In the current process of drying nylon 66 chips, wet chips are sent to a displacement hopper via compressed air, where nitrogen is used to displace the air before the chips enter a buffer hopper and then the drying tower. However, before entering the drying tower, the temperature of the wet chips is affected by various factors such as the storage environment, the temperature of the conveying medium, and the ambient temperature, resulting in significant temperature differences among the wet chips entering the drying tower. These temperature differences cause uneven heat consumption by the wet chips entering the drying tower, leading to fluctuations in the drying tower temperature and return gas temperature, ultimately resulting in uneven moisture content in the dried chips. Utility Model Content
[0004] The purpose of this invention is to provide a slice drying device with a nylon 66 wet slice preheating structure to overcome the problems in the prior art, such as unstable temperature of wet slices entering the drying tower, resulting in temperature fluctuations in the drying tower and uneven moisture content of dry slices. This invention improves the uniformity and stability of moisture content in dry slices, shortens drying time, increases drying efficiency, and achieves energy-saving effects.
[0005] To achieve the above objectives, this utility model provides a slicing drying device with a nylon 66 wet slicing preheating structure, including a replacement hopper, a buffer hopper, a drying tower, and a nitrogen purification system; the top of the drying tower is provided with a drying tower inlet, a waste heat recovery inlet, and a nitrogen outlet; the bottom of the buffer hopper is provided with a nitrogen distributor, which is connected to the waste heat recovery inlet via a fan; the nitrogen outlet is connected to the nitrogen purification system.
[0006] By adopting the above structure, the preheating of the wet slices fed into the drying tower ensures a relatively stable temperature of the slices entering the tower, avoiding temperature fluctuations due to differences in feed temperature. This effectively improves the stability of the drying tower operation and the uniformity of moisture content in the dried slices, further shortening the drying time and significantly increasing drying efficiency. The nitrogen distributor is connected to the top of the drying tower via a fan. The heat used for preheating the wet slices is the waste heat carried by the return gas from the top of the drying tower, achieving secondary energy utilization. Simultaneously, it reduces the return gas temperature of nitrogen from the top of the drying tower, decreasing the cooling energy consumption of the nitrogen purification system and achieving effective energy savings. Furthermore, the nitrogen outlet is connected to the nitrogen purification system, allowing excess nitrogen to be transported there, ensuring stable system operation.
[0007] Preferably, the device also includes a PLC control system and a temperature measuring device connected to the PLC control system; the PLC control system is connected to the fan; the temperature measuring device includes a first thermometer installed at the outlet of the buffer hopper and a second thermometer installed inside the buffer hopper. With this configuration, the preheating temperature can be monitored by the first and second thermometers, and the preheating temperature is transmitted to the PLC control system. The PLC control system then intelligently adjusts the fan's airflow to optimize the preheating temperature.
[0008] Preferably, the top of the buffer silo is equipped with a buffer silo inlet and a buffer silo outlet; the buffer silo inlet is connected to the replacement silo via a discharge valve; the buffer silo outlet is connected to the inlet of the nitrogen purification system via a buffer silo return gas pipeline; the top of the replacement silo is also equipped with a balancing port, to which a balancing pipeline is connected, and the balancing pipeline is connected to the buffer silo return gas pipeline. This structural design ensures stable pressure in both the buffer silo and the replacement silo, guaranteeing stable material discharge.
[0009] Preferably, a rotary valve is provided on the discharge port of the buffer chamber, and the first thermometer is located above the rotary valve.
[0010] Preferably, a regulating valve is also provided between the blower and the nitrogen distributor.
[0011] Preferably, the nitrogen distributor includes an annular tube fixed inside the buffer chamber; a gas inlet is provided on the annular tube, and the gas inlet is connected to an air inlet pipe; the air inlet pipe extends out of the buffer chamber and connects to a fan; air jets are evenly arranged on the side wall of the annular tube, with the air jets facing the inside of the annular tube. Uniform gas output can be achieved through the annular tube and the air jets evenly arranged around the annular tube.
[0012] Preferably, the jet nozzle is tilted downwards towards the central axis of the buffer chamber; its outlet direction forms a 45° angle with the central axis of the buffer chamber. Due to the downward-tilted jet nozzle, based on the principle of upward airflow, the gas, after being ejected, will first tilt downwards between the slits of the slices, and then diffuse upwards.
[0013] Preferably, the annular pipe has two gas inlets, symmetrically located on both sides of the annular pipe; the inlet pipes of the two gas inlets extend from both sides of the buffer chamber and are connected in parallel to the fan. The two gas inlets ensure sufficient gas pressure and prevent low pressure at the end of the pipe, which could lead to unstable preheating in that area.
[0014] Preferably, the nitrogen distributor also includes a protective cover fixed to the side wall of the buffer chamber. The protective cover has a circular structure with a cross-section consisting of a ridge structure composed of two inclined plates; the annular pipe is fixed inside the protective cover. The protective cover effectively protects the annular pipe and reduces the pressure on it.
[0015] After adopting the above technical solution, the beneficial effects of this utility model are:
[0016] This invention relates to a slicing and drying device with a nylon 66 wet slicing preheating structure. It solves the technical problem in existing technologies where wet slices are inconsistently heated, resulting in uneven heat consumption upon entering the drying tower. This uneven heat consumption leads to fluctuations in the drying tower temperature and return gas temperature, ultimately causing uneven moisture content in the dried slices. This invention preheats the wet slices fed into the drying tower, ensuring a relatively stable temperature upon entry. This avoids temperature fluctuations in the drying tower caused by differences in feed temperature, effectively improving the stability of the drying tower operation and the uniformity of moisture content in the dried slices. Furthermore, it shortens the drying time and significantly increases drying efficiency. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a slice drying device with a nylon 66 wet slice preheating structure according to the present invention;
[0018] Figure 2 This is a schematic diagram of a nitrogen distributor;
[0019] Figure 3 yes Figure 2 A bottom view;
[0020] Figure 4 yes Figure 3 Sectional view along the BB direction;
[0021] Figure 5 yes Figure 4 A magnified view of part A in the image;
[0022] Figure 6 yes Figure 3 Sectional view along the CC direction.
[0023] In the diagram, 1. Replacement hopper, 11. Discharge valve, 12. Balance port, 121. Balance pipeline, 13. Second switch valve, 2. Buffer hopper, 21. Rotary valve, 22. Buffer hopper inlet, 23. Buffer hopper outlet, 24. Buffer hopper return pipeline, 241. First switch valve, 25. Buffer hopper outlet, 3. Drying tower, 31. Drying tower inlet, 32. Waste heat recovery port, 321. Fan, 322. Adjustment valve 33. Nitrogen outlet, 34. Drying tower outlet, 35. Gas inlet, 36. Drying tower return gas pipeline, 37. Nitrogen heating pipeline, 371. Heater, 4. Nitrogen distributor, 41. Ring pipe, 411. Gas inlet, 412. Gas nozzle, 413. Inlet pipe, 42. Protective cover, 421. Fixed column, 43. U-shaped hook, 5. Nitrogen purification system, 61. First thermometer, 62. Second thermometer. Detailed Implementation
[0024] The present invention will be further described below with reference to the accompanying drawings.
[0025] The orientations mentioned in this specification are based on the orientation of the slicing and drying device with a nylon 66 wet slicing preheating structure during normal operation. They do not limit the orientation during storage and transportation, but only represent relative positional relationships, not absolute positional relationships.
[0026] like Figure 1 As shown, a slicing drying device with a nylon 66 wet slicing preheating structure includes a displacement hopper 1, a buffer hopper 2, a drying tower 3, and a nitrogen purification system 5.
[0027] The top of the replacement hopper 1 is equipped with a replacement hopper inlet for adding the slices into the replacement hopper 1; the bottom is equipped with a replacement hopper outlet, which is connected to the buffer hopper 2 via a discharge valve 11. The discharge valve 11 is used to control the flow rate of wet slices from the replacement hopper 1 into the buffer hopper 2. The replacement hopper 1 is used for nitrogen replacement of the wet slices. The replacement hopper 1 is prior art, and its specific structure will not be described in detail in this embodiment.
[0028] Buffer chamber 2 includes a sealed buffer chamber body. The buffer chamber body is a cylindrical structure with a closed top and a conical bottom. The top of buffer chamber 2 has a buffer chamber inlet 22 and a buffer chamber outlet 23; the buffer chamber inlet 22 is connected to a discharge valve 11; the buffer chamber outlet 23 is connected to the inlet of the nitrogen purification system 5 via a buffer chamber return gas pipeline 24. A first switching valve 241 is installed on the buffer chamber return gas pipeline 24. The top of the replacement hopper 1 also has a balancing port 12, which is connected to a balancing pipeline 121, and a second switching valve 13 is installed on the balancing pipeline 121. The balancing pipeline 121 is connected to the buffer chamber return gas pipeline 24 to balance the pressure in the replacement hopper 1 and buffer chamber 2, ensuring smooth material discharge. The bottom of the buffer chamber body has a buffer chamber outlet 25, which is connected to the drying tower 3 via a rotary valve 21. Rotary valve 21 is used to control the flow rate of wet slices from buffer chamber 2 into drying tower 3.
[0029] A nitrogen distributor 4 is also installed inside the buffer chamber 2, which is connected to the top of the drying tower 3 via a fan 321. The nitrogen distributor 4 releases hot nitrogen into the buffer chamber 2 to preheat the wet slices inside. By preheating the wet slices fed into the drying tower 3, the relative stability of the temperature of the wet slices entering the drying tower 3 is ensured, avoiding temperature fluctuations in the drying tower 3 caused by differences in feed temperature. This effectively improves the operational stability of the drying tower 3 and the uniformity of moisture content in the dried slices, further shortening the drying time of the drying tower 3 and effectively improving drying efficiency. The nitrogen distributor 4 is connected to the top of the drying tower 3 via the fan 321. The heat used for preheating the wet slices is the waste heat carried by the return gas from the top of the drying tower 3, realizing secondary energy utilization. At the same time, it reduces the return gas temperature of the nitrogen at the top of the drying tower 3, reducing the cooling energy consumption of the nitrogen purification system 5 and achieving effective energy saving.
[0030] The drying tower 3 is used to dry wet slices. Its top is equipped with a drying tower inlet 31, a waste heat recovery inlet 32, and a nitrogen outlet 33. The drying tower inlet 31 is connected to a rotary valve 21 to receive the preheated wet slices from the buffer chamber 2. The waste heat recovery inlet 32 is connected to a nitrogen distributor 4 via a fan 321. A regulating valve 322 is also installed between the fan 321 and the nitrogen distributor 4. The regulating valve 322 controls the flow rate of hot nitrogen. This structure allows the hot nitrogen from the top of the drying tower 3 to be directly delivered to the nitrogen distributor 4, thereby preheating the wet slices in the buffer chamber 2, achieving waste heat recovery and reducing heat loss. The nitrogen outlet 33 is connected to the inlet of the nitrogen purification system 5 via the drying tower return pipeline 36. The nitrogen outlet 33 is used to return excess nitrogen from the top of the drying tower 3 to the nitrogen purification system 5, ensuring stable system operation.
[0031] The side wall of the drying tower 3 is also provided with a gas inlet 35, which is connected to the outlet of the nitrogen purification system 5 through a nitrogen heating pipeline 37. A heater 371 is also provided on the nitrogen heating pipeline 37, which is used to heat the passing nitrogen to a preset temperature, thereby drying the slices in the drying tower 3.
[0032] The bottom of the drying tower 3 is provided with a drying tower outlet 34, which is used to discharge the dried slices.
[0033] The nitrogen purification system 5 includes a dust collector, a deaerator, a dehumidifier, a nitrogen replenishment device, and an internal fan for conveying purified nitrogen out of the nitrogen purification system 5. The structure of a nitrogen purification system for solid-phase polycondensation disclosed in Chinese Patent CN 111282306 A can be referenced. Since it is not an improvement of this application, its structure will not be described in detail.
[0034] A slicing and drying apparatus with a nylon 66 wet slice preheating structure further includes a PLC control system and a temperature measuring device connected to the PLC control system; the PLC control system is also connected to a fan 321. The temperature measuring device includes a first thermometer 61 located at the outlet 25 of the buffer chamber and above the rotary valve 21, and a second thermometer 62 located inside the buffer chamber 2. The first thermometer 61 monitors the temperature of the wet slices at the outlet 25 of the buffer chamber. The second thermometer 62 monitors the temperature of the wet slices inside the buffer chamber 2.
[0035] like Figures 2-6 As shown in another embodiment, the nitrogen distributor 4 includes an annular pipe 41 fixed inside the buffer chamber; a gas inlet 411 is provided on the annular pipe 41, and the gas inlet 411 is connected to an air inlet pipe 413; the air inlet pipe 413 extends out of the buffer chamber 2 and connects to a fan 321. Air nozzles 412 are evenly arranged on the side wall of the annular pipe 41, facing the interior of the annular pipe 41. The air nozzles 412 evenly spray hot nitrogen gas from inside the annular pipe 41. The air nozzles 412 are inclined downwards towards the central axis of the buffer chamber; their outlet direction forms a 45° angle with the central axis of the buffer chamber. Figure 4 and Figure 5 (As shown).
[0036] There are two gas inlets 411 on the annular pipe 41, and the two gas inlets 411 are symmetrically arranged on both sides of the annular pipe 411; the air inlet pipes 413 of the two gas inlets 411 pass out from both sides of the buffer chamber 2 and are connected in parallel to the fan 321.
[0037] The nitrogen distributor 4 also includes a protective cover 42 fixed to the side wall of the buffer chamber. The protective cover 42 has a circular structure and its cross-section is a ridge structure composed of two inclined plates (e.g., Figure 4(As shown). A plurality of fixing posts 421 are evenly arranged around the protective cover 42. One end of each fixing post 421 is fixed to an inclined plate, and the other end is fixed to the side wall of the buffer chamber. They can be fixed by welding. The annular tube 41 is fixed inside the protective cover 42. In this embodiment, the fixing method is: fixed by a U-shaped hook 43 (as shown). Figure 6 (As shown); Multiple U-shaped hooks 43 are provided around the annular tube 41, with their bottoms hooked onto the annular tube 41 and their tops passing upward through the protective cover 42, and are tightened above the protective cover 42 by nuts to prevent them from falling.
[0038] like Figures 1-6 As shown in the figure, the working process of the slicing and drying device with a nylon 66 wet slicing preheating structure of this utility model is as follows:
[0039] The slice's execution path:
[0040] After the nitrogen purging of the wet slices is completed in the replacement hopper 1, the discharge valve 11 and the second switch valve 13 are opened to transport the wet slices to the buffer hopper 2. After the wet slices enter the buffer hopper 2, the rotary valve 21 is activated to send the wet slices into the drying tower 3. After the wet slices enter the drying tower 3, the nitrogen purification system 5 and the heater 371 are activated to dry the wet slices.
[0041] Nitrogen's path:
[0042] After the nitrogen in the drying tower 3, nitrogen purification system 5, and heater 371 has circulated normally, the regulating valve 322 is opened to 30% (adjusted according to the preheating temperature after normal operation), the first switch valve 241 is opened, and the fan 321 is started to send the nitrogen gas at about 50°C accumulated at the top of the drying tower 3 to the nitrogen distributor 4 at the bottom of the buffer chamber 2. The nitrogen distributor 4 evenly preheats the wet slices in the buffer chamber 2 with the delivered hot nitrogen gas, raising the temperature to 35-40°C. The preheating temperature of the wet slices in the buffer chamber 2 is judged by observing the first thermometer 61 and the second thermometer 62, and the preheating temperature is controlled by adjusting the opening of the regulating valve 322.
[0043] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.
Claims
1. A slicing and drying apparatus with a nylon 66 wet slicing preheating structure, characterized in that: Includes a replacement silo, a buffer silo, a drying tower, and a nitrogen purification system; The top of the drying tower is equipped with a drying tower inlet, a waste heat recovery inlet, and a nitrogen outlet; A nitrogen distributor is installed at the bottom of the buffer chamber, and the nitrogen distributor is connected to the waste heat recovery port via a fan; the nitrogen outlet is connected to the nitrogen purification system.
2. The slicing drying apparatus with a nylon 66 wet slicing preheating structure according to claim 1, characterized in that: It also includes a PLC control system and a temperature measuring device connected to the PLC control system via signal connection; the PLC control system is connected to the fan via signal connection. The temperature measuring device includes a first thermometer installed at the outlet of the buffer chamber and a second thermometer installed inside the buffer chamber.
3. The slicing drying apparatus with a nylon 66 wet slicing preheating structure according to claim 1, characterized in that: The top of the buffer chamber is provided with a buffer chamber inlet and a buffer chamber outlet; the buffer chamber inlet is connected to the replacement silo via a discharge valve; the buffer chamber outlet is connected to the inlet of the nitrogen purification system via a buffer silo return gas pipeline. The top of the replacement hopper is also provided with a balance port, and a balance pipeline is connected to the balance port. The balance pipeline is connected to the air return pipeline of the buffer hopper.
4. A slicing and drying apparatus with a nylon 66 wet slicing preheating structure according to claim 2, characterized in that: A rotary valve is provided on the discharge port of the buffer chamber, and the first thermometer is located above the rotary valve.
5. A slicing and drying apparatus with a nylon 66 wet slicing preheating structure according to claim 2, characterized in that: A regulating valve is also provided between the blower and the nitrogen distributor.
6. A slicing drying apparatus with a nylon 66 wet slicing preheating structure according to claim 1, characterized in that: The nitrogen distributor includes an annular pipe fixed inside the buffer chamber; a gas inlet is provided on the annular pipe, and the gas inlet is connected to an air inlet pipe; the air inlet pipe extends out of the buffer chamber and connects to the fan; Air jets are evenly distributed on the sidewall of the annular tube, and the air jets face the interior of the annular tube.
7. A slicing and drying apparatus with a nylon 66 wet slicing preheating structure according to claim 6, characterized in that: The jet nozzle is tilted downwards and faces the central axis of the buffer chamber. Its air outlet direction forms a 45° angle with the central axis of the buffer chamber.
8. A slicing and drying apparatus with a nylon 66 wet slicing preheating structure according to claim 6, characterized in that: The annular pipe has two gas inlets, which are symmetrically arranged on both sides of the annular pipe. The inlet pipes of the two gas inlets pass through the two sides of the buffer chamber and are connected in parallel to the fan.
9. A slicing and drying apparatus with a nylon 66 wet slicing preheating structure according to claim 6, characterized in that: The nitrogen distributor also includes a protective cover fixed to the side wall of the buffer chamber. The protective cover is a ring structure with a cross-section consisting of two inclined plates forming a ridge structure. The annular tube is fixed inside the protective cover.