A civilian nylon 66 chip drying system and drying method

Abstract

The present invention relates to a civilian nylon 66 chip drying system and drying method, comprising a storage bin, a replacement bin, a conveying bin, a mixing bin, a deoxidizing device, a vacuum pump, a fan A, a feed bin, a drying tower, a moisture meter, and a discharge bin; the drying tower is connected to a nitrogen circulation regeneration module; the storage bin is connected to the replacement bin via a storage and discharge pipe, the other end of the storage bin is connected to the mixing bin via a replacement and discharge pipe, the other end of the replacement bin is connected to the conveying bin via a replacement and discharge pipe, the other end of the conveying bin is connected to the fan A via a delivery and discharge pipe, the fan A is connected to the feed bin via a feed bin feed pipe, the feed bin is connected to the drying tower via a feed bin discharge pipe, the feed bin feed pipe is connected to the mixing bin via a mixing feed pipe, the drying tower is connected to the moisture meter, and the drying tower is connected to the discharge bin via a drying and discharge pipe; the present invention can dry and cool civilian silk to achieve industrialized continuous production.

Description

Technical Field

[0001] The invention belongs to the technical field of nylon chip drying, and in particular relates to a civilian nylon 66 chip drying system and a drying method. Background Art

[0002] The development of my country's PA66 industry has long been constrained by foreign monopolies and high prices for adiponitrile. After years of unremitting efforts, adiponitrile is on the verge of full domestication. According to statistics, the current planned annual production capacity of adiponitrile in China has reached 3.9 million tons, and the planned annual production capacity of PA66 is as high as 5.95 million tons. PA66 civilian yarn offers advantages such as high elasticity, high wear resistance, good breathability, soft feel, easy rinsing, and a soft sheen. It is the fiber of choice for yoga wear, suits, underwear, outdoor clothing, sportswear, and winter clothing. Furthermore, PA66 can be used in military footwear and parachutes, among other applications. Therefore, with the growth of PA66 production capacity and the significant decline in its price, PA66 fiber is in huge demand in both the military and civilian sectors, creating an urgent need for the development of nylon 66 filament.

[0003] The moisture content of PA66 chips is a key indicator of long fiber quality. Due to the amide groups in the PA66 molecular chain, PA66 chips are susceptible to hydrolysis in the presence of water in the molten state, resulting in a decrease in molecular weight and relative viscosity, leading to poor spinnability and poor nylon 66 formability. Furthermore, if the moisture content of PA66 chips is too high, the moisture in the chips will form water vapor at high temperatures. Due to the relatively closed environment of melt spinning, this water vapor is difficult to escape and instead enters the polyamide 66 melt, forming bubbles during tow formation. This can lead to yarn breakage during drafting, difficulty in yarn formation, and a high breakage rate. However, if the moisture content is too low, it acts as a solid-phase viscosity increase, making spinning more difficult. Therefore, PA66 drying is crucial, and the moisture stability during the drying process will significantly affect the spinnability and yarn quality stability of PA66.

[0004] Chinese patent CN218120449U discloses an integrated drying and cooling system for PA66 slices, the raw material for producing stretch weft yarn. By using a sealed tank, both drying and cooling are performed within the tank, preventing oxidation of the PA66 slices from high-temperature contact with air and thus ensuring slice quality. This system is suitable only for industrial yarns and not for consumer yarns.

[0005] Chinese patent CN217979714U discloses a moisture regulation device for drying PA66 chips, including a drying tower, a conveying tower, and a silo. Nitrogen supply is controlled by an electronic control valve according to the set dew point value to ensure that the nitrogen dew point values ​​in the drying tower and the conveying tower are consistent, maintaining the stability of the moisture content of the chips during transportation. However, this device is only suitable for small-batch production and cannot meet the needs of industrial production. Summary of the Invention

[0006] In order to solve the problem that the existing nylon 66 chip drying and cooling device is not suitable for civilian silk, has low production efficiency and cannot meet the needs of industrial production, the present invention provides a civilian nylon 66 chip drying system and drying method, which can dry and cool civilian silk to achieve industrial continuous production.

[0007] A civilian nylon 66 chip drying system includes a storage bin, a replacement bin, a conveying bin, a mixing bin, a deoxidizer, a vacuum pump, a blower A, a feed bin, a drying tower, a moisture meter, and a discharge bin; the drying tower is connected to a nitrogen circulation regeneration module;

[0008] The storage bin is connected to the replacement bin through a storage discharge pipe, the other end of the storage bin is connected to the mixing bin through a mixing discharge pipe, the other end of the replacement bin is connected to the conveying bin through a replacement discharge pipe, the other end of the conveying bin is connected to the fan A through a conveying discharge pipe, the fan A is connected to the feed bin through a feed bin feed pipe, the feed bin is connected to the drying tower through a feed bin discharge pipe, the feed bin feed pipe is connected to the mixing bin through a mixing feed pipe, the drying tower is connected to a moisture meter, and the drying tower is connected to the discharge bin through a drying discharge pipe;

[0009] The replacement chamber is connected to the deoxygenation device via a replacement oxygen outlet pipe, and the delivery chamber is connected to the deoxygenation device via an delivery oxygen outlet pipe;

[0010] The replacement bin and the delivery bin are respectively connected with a replacement bin nitrogen inlet pipe and a delivery bin nitrogen inlet pipe.

[0011] Preferably, the nitrogen circulation regeneration module includes a dust collector A, a dew point temperature tester, a dehumidification device, a dust collector B, a heating device, and a fan B;

[0012] The drying tower is connected to the dust collector A through the drying outlet pipe, the dust collector A is connected to the dew point temperature tester through the dust removal outlet pipe, the dew point temperature tester is connected to the dehumidification device through the dew point outlet pipe, the dehumidification device is connected to the dust collector B through the dehumidification outlet pipe, the dust collector B is connected to the fan B through the dust removal air pipe, the fan B is connected to the heating device through the fan outlet pipe, and the heating device is connected to the drying tower through the heating outlet pipe.

[0013] Preferably, the deoxygenation device is connected to a vacuum pump.

[0014] Preferably, ball valves are provided on the storage discharge pipe, the replacement discharge pipe, the replacement oxygen outlet pipe, the oxygen delivery outlet pipe and the feed bin discharge pipe.

[0015] Preferably, the conveying discharge pipe and the drying discharge pipe are provided with control valves.

[0016] Preferably, three-way ball valves are provided on the feed bin feed pipe, drying outlet pipe, dust removal outlet pipe, dew point outlet pipe, dehumidification outlet pipe and dust removal air pipe, wherein the dehumidification outlet pipe has a pair of three-way ball valves.

[0017] Preferably, the dehumidification outlet pipe is provided with a pair of three-way ball valves, specifically including a three-way ball valve A and a three-way ball valve B. A first bypass pipe is connected between the three-way ball valve of the drying outlet pipe and the three-way ball valve of the dust removal outlet pipe, a second bypass pipe is connected between the three-way ball valve of the dew point outlet pipe and the three-way ball valve A of the dehumidification outlet pipe, and a third bypass pipe is connected between the three-way ball valve of the dust removal pipe and the three-way ball valve B of the dehumidification outlet pipe.

[0018] Preferably, the top of the storage bin is provided with a slice feed pipe, the slice feed pipe is provided with a feed control valve, the bottom of the storage bin is provided with a storage conveying pipe, the inside of the storage bin is provided with a plurality of discharge pipes, the ends of the plurality of discharge pipes are connected to the storage conveying pipe, the storage conveying pipe is provided with a discharge control valve, and the end of the storage conveying pipe is connected to the storage discharge pipe.

[0019] Preferably, the dehumidification device includes a four-way ball valve provided at the input end, a four-way ball valve provided at the output end, a dehumidification device A, a dehumidification device B, a condensation tank and a fan, the dew point outlet pipe is connected to the four-way ball valve at the input end, the four-way ball valve at the input end is further connected to a dehumidification inlet pipe A, a condensation inlet pipe and a dehumidification inlet pipe B, the dehumidification inlet pipe A is connected to the dehumidification device A, the condensation inlet pipe is connected to the condensation tank, and the dehumidification inlet pipe B is connected to the dehumidification device B;

[0020] A dehumidification condensation connecting pipe is connected between the dehumidification device A and the condensation tank, a fan air inlet pipe is connected between the condensation tank and the fan, and a fan air outlet pipe is connected between the fan and the four-way ball valve at the output end;

[0021] A dehumidification outlet pipe A is connected between the dehumidification device A and the four-way ball valve at the output end;

[0022] A dehumidification outlet pipe B is connected between the dehumidification device B and the four-way ball valve at the output end;

[0023] The four-way ball valve at the output end is connected to the dehumidification outlet pipe.

[0024] A method for drying civilian nylon 66 chips is implemented by the above-mentioned drying system, and the method comprises the following steps:

[0025] Step 1: Preliminary mixing of slices: wet PA66 slices enter from the storage silo port, and after preliminary mixing in the storage silo, the slices enter the replacement silo through the pipeline;

[0026] Step 2: Initial deoxygenation: nitrogen is introduced into the bottom of the replacement chamber through the nitrogen inlet pipe, so that the oxygen in the chamber is discharged from the top of the replacement chamber, and the discharged oxygen enters the deoxygenation device through the replacement oxygen outlet pipe;

[0027] Step 3, thorough deoxygenation: After the replacement bin is deoxygenated, the slices enter the conveying bin through the replacement discharge pipe. Nitrogen is input into the bottom of the conveying bin through the nitrogen inlet pipe on the conveying bin, and the oxygen in the bin is discharged from the top of the conveying bin. The oxygen enters the deoxygenation device through the oxygen delivery outlet pipe;

[0028] Step 4: Slices are completely mixed: The wet PA66 slices in the conveying bin are conveyed into the mixing bin by the power of fan A, and then the slices in the mixing bin are put into the storage bin again and the above steps 1, 2 and 3 are repeated ≥ 2 times until the slices are completely mixed;

[0029] Step 5: Slice dehumidification: The completely mixed wet PA66 slices in the conveying bin are transported into the feed bin by fan A, and then enter the drying tower through the discharge pipe of the feed bin. Dry hot nitrogen enters the drying tower. After drying the slices, the nitrogen with moisture is discharged from the top of the drying tower and then passes through the nitrogen circulation regeneration module to form convection in the drying tower. The moisture in the slices is removed within a certain period of time, and 800-1000ppm dry PA66 slices are prepared. The moisture content of the slices in the drying tower is detected in real time by a moisture meter. When the moisture content is between 800-1000ppm, the dry PA66 slices are output to the discharge bin. Otherwise, the drying continues.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention effectively removes oxygen from the slices through the slice mixing process, achieving uniform mixing of PA66 slices from different batches, thereby improving the uniformity of the slices. Furthermore, the mixing process effectively prevents the slices from being stored in the storage bin for too long, preventing unbound water on the slice surface from penetrating inward to form bound water, which would increase the difficulty of drying.

[0032] (2) The present invention controls the three-way valve on the circulation pipeline according to the dew point value. When the nitrogen dew point is lower than the set value, it is transported from the bypass channel, thereby improving the utilization rate of the dehumidifier.

[0033] (3) The present invention sets two sets of dust collectors in the nitrogen circulation regeneration module, which greatly improves the purity of PA66 chips and effectively prevents the dust in the chips from affecting the subsequent spinning process.

[0034] (4) The existing slice moisture control mainly uses empirical values ​​to set the drying time. However, the moisture content of each batch of PA66 is different, so it is impossible to accurately control the moisture content of the slices. The present invention installs an online moisture tester at the drying tower, which can implement online detection of the moisture content of the slices in the drying tower and transmit the test value to the control valve. When the moisture content of the slices in the drying tower reaches the set value, the control valve is opened, otherwise the drying continues. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 Schematic diagram of the storage silo structure;

[0037] Figure 3 It is a structural diagram of the dehumidification device;

[0038] In the figure: 1-storage bin, 2-replacement bin, 3-conveying bin, 4-mixing bin, 5-deoxygenation device, 6-vacuum pump, 7-fan A, 8-feeding bin, 9-drying tower, 10-moisture meter, 11-discharge bin, 12-dust collector A, 13-dew point temperature tester, 14-dehumidification device, 15-dust collector B, 16-heating device, 17-fan B, 18-feeding pipe, 19-slice feeding pipe, 20-feeding control valve, 21-storage conveying pipe, 22-discharge control valve, 23-dehumidification device A, 24-condensation tank, 25-dehumidification device B, 26-fan C, 100-storage discharge pipe, 101-replacement discharge pipe, 102-conveying discharge pipe, 1 03-Feed silo feed pipe, 104-Oxygen replacement outlet pipe, 105-Oxygen delivery outlet pipe, 106-Feed silo outlet pipe, 107-Drying outlet pipe, 108-Dust removal outlet pipe, 109-Dew point outlet pipe, 110-Dehumidification outlet pipe, 111-Dust removal pipe, 112-Fan outlet pipe, 113-Heating outlet pipe, 114-Drying outlet pipe, 115-Mixing outlet pipe, 116-Mixing feed pipe, 117-Dehumidification inlet pipe A, 118-Condensation inlet pipe, 119-Dehumidification inlet pipe B, 120-Dehumidification condensation connecting pipe, 121-Fan inlet pipe, 122-Fan outlet pipe, 123-Dehumidification outlet pipe A, 124-Dehumidification outlet pipe B. DETAILED DESCRIPTION

[0039] The present invention is described in detail below through implementation and in conjunction with the accompanying drawings. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential adjustments based on the content of the above invention.

[0040] See also Figure 1A civilian nylon 66 chip drying system includes a storage bin 1, a replacement bin 2, a conveying bin 3, a mixing bin 4, a deoxidizer 5, a vacuum pump 6, a blower A7, a feed bin 8, a drying tower 9, a moisture meter 10, a discharge bin 11, a storage discharge pipe 100, a replacement discharge pipe 101, a conveying discharge pipe 102, a feed bin feed pipe 103, a replacement oxygen outlet pipe 104, a conveying oxygen outlet pipe 105, a feed bin discharge pipe 106, a drying discharge pipe 114, a mixing discharge pipe 115, and a mixing feed pipe 116;

[0041] The storage bin 1 is connected to the replacement bin 2 through a storage discharge pipe 100, the other end of the storage bin 1 is connected to the mixing bin 4 through a mixing discharge pipe 115, the mixing bin is connected to the feeding bin through a mixing feed pipe, the other end of the replacement bin 2 is connected to the conveying bin 3 through a replacement discharge pipe 101, the other end of the conveying bin 3 is connected to the fan A7 through a conveying discharge pipe 102, the fan A7 is connected to the feeding bin 8 through a feeding bin feed pipe 103, the feeding bin 8 is connected to the drying tower 9 through the feeding bin discharge pipe 106, the drying tower 9 is connected to the moisture meter 10, and the drying tower 9 is connected to the discharge bin 11 through the drying discharge pipe 114;

[0042] The replacement chamber 2 is connected to the deoxygenation device 5 via the replacement oxygen outlet pipe 104, and the delivery chamber 3 is connected to the deoxygenation device 5 via the delivery oxygen outlet pipe 105;

[0043] The replacement bin 2 and the delivery bin 3 are connected to a replacement bin nitrogen inlet pipe and a delivery bin nitrogen inlet pipe respectively.

[0044] In one embodiment of the present invention, the nitrogen recycling and regeneration module includes a dust collector A12, a dew point temperature tester 13, a dehumidifier 14, a dust collector B15, a heating device 16, a fan B17, a drying outlet pipe 107, a dust removal outlet pipe 108, a dew point outlet pipe 109, a dehumidification outlet pipe 110, a dust removal air pipe 111, a fan outlet pipe 112, and a heating outlet pipe 113;

[0045] The drying tower 9 is connected to the dust collector A12 through the drying outlet pipe 107, the dust collector A12 is connected to the dew point temperature tester 13 through the dust removal outlet pipe 108, the dew point temperature tester 13 is connected to the dehumidification device 14 through the dew point outlet pipe 109, the dehumidification device 14 is connected to the dust collector B15 through the dehumidification outlet pipe 110, the dust collector B15 is connected to the fan B17 through the dust removal air pipe 111, the fan B17 is connected to the heating device 16 through the fan outlet pipe 112, and the heating device 16 is connected to the drying tower 9 through the heating outlet pipe 113.

[0046] The working principle of nitrogen circulation regeneration module is as follows:

[0047] 1. Preliminary dust removal: Nitrogen with moisture is discharged from the top of the drying tower and enters the dust collector A to remove dust from the nitrogen;

[0048] 2. Dehumidification: The nitrogen after dust removal enters the dehumidification device to remove moisture from the nitrogen;

[0049] 3. Dust removal: The dried nitrogen enters the dust collector B to further remove dust from the nitrogen;

[0050] 4. Heating: The dry nitrogen after dust removal enters the nitrogen heating device through fan B for heating;

[0051] See also Figure 1 In one embodiment of the present invention, the deoxygenation device 5 is connected to the vacuum pump 6.

[0052] See also Figure 2 In one embodiment of the present invention, ball valves are provided on the storage discharge pipe 100, the replacement discharge pipe 101, the replacement oxygen outlet pipe 104, the delivery oxygen outlet pipe 105 and the feed bin discharge pipe 106 to control the flow rate.

[0053] See also Figure 1 In one embodiment of the present invention, control valves are provided on the delivery discharge pipe 102 and the drying discharge pipe 114 to control the flow direction of the nylon 66 chips.

[0054] See also Figure 1 In one embodiment of the present invention, three-way ball valves are provided on the feed bin feed pipe 103, the drying outlet pipe 107, the dust removal outlet pipe 108, the dew point outlet pipe 109, the dehumidification outlet pipe 110 and the dust removal outlet pipe 111, wherein the dehumidification outlet pipe 110 has a pair of three-way ball valves.

[0055] See also Figure 1 Based on the previous embodiment, the dehumidification outlet pipe 110 is provided with a pair of three-way ball valves, specifically including a three-way ball valve A and a three-way ball valve B. A first bypass pipe P1 is connected between the three-way ball valve of the drying outlet pipe 107 and the three-way ball valve of the dust removal outlet pipe 108, a second bypass pipe P2 is connected between the three-way ball valve of the dew point outlet pipe 109 and the three-way ball valve A of the dehumidification outlet pipe 110, and a third bypass pipe P3 is connected between the three-way ball valve of the dust removal pipe 111 and the three-way ball valve B of the dehumidification outlet pipe 110.

[0056] In the present invention, the bypass pipes P1 and P3 are used to allow nitrogen to enter from the bypass pipes when a dust collector stops operating for cleaning, in order to ensure the normal operation of the entire system, thereby ensuring the operation of at least one dust collector; the P2 bypass pipe is used when the dew point of nitrogen is lower than -10±2°C as detected by a dew point thermometer and humidity meter, and the nitrogen does not need to be dehumidified, and enters from the P2 bypass pipe without entering the dehumidification device.

[0057] See also Figure 3 In one embodiment of the present invention, the top of the storage bin 1 has a slice feed pipe 19, and the slice feed pipe 19 is provided with a feed control valve 20. The bottom of the storage bin 1 has a storage conveying pipe 21. The storage bin 1 has several discharge pipes 18, and the ends of several of the discharge pipes 18 are connected to the storage conveying pipe 21. The storage conveying pipe 21 is provided with a discharge control valve 22, and the end of the storage conveying pipe 21 is connected to the storage discharge pipe 100.

[0058] See also Figure 1 In one embodiment of the present invention, the dehumidification device 14 includes a four-way ball valve provided at the input end, a four-way ball valve provided at the output end, a dehumidification device A23, a dehumidification device B25, a condensation tank 24, and a fan 26. The dew point outlet pipe 109 is connected to the four-way ball valve at the input end. The four-way ball valve at the input end is also connected to a dehumidification inlet pipe A117, a condensation inlet pipe 118, and a dehumidification inlet pipe B119. The dehumidification inlet pipe A117 is connected to the dehumidification device A23, the condensation inlet pipe 118 is connected to the condensation tank 24, and the dehumidification inlet pipe B119 is connected to the dehumidification device B25.

[0059] A dehumidification and condensation connecting pipe 120 is connected between the dehumidification device A23 and the condensation tank 24, a fan air inlet pipe 121 is connected between the condensation tank 24 and the fan 26, and a fan air outlet pipe 122 is connected between the fan and the four-way ball valve at the output end;

[0060] A dehumidification outlet pipe A123 is connected between the dehumidification device A23 and the four-way ball valve at the output end;

[0061] A dehumidification outlet pipe B124 is connected between the dehumidification device B25 and the four-way ball valve at the output end;

[0062] The four-way ball valve at the output end is connected to the dehumidification outlet pipe 110 .

[0063] A method for drying civilian nylon 66 chips, comprising the following steps:

[0064] Step 1: Preliminary mixing of slices: wet PA66 slices enter from the storage silo port, and after preliminary mixing in the storage silo, the slices enter the replacement silo through the pipeline;

[0065] Step 2: Initial deoxygenation: nitrogen is introduced into the bottom of the exchange chamber through the nitrogen inlet pipe of the exchange chamber, so that the oxygen in the chamber is discharged from the top of the exchange chamber, and the discharged oxygen enters the deoxygenation device through the exchange oxygen outlet pipe;

[0066] Step 3, thorough deoxygenation: After the replacement bin is deoxygenated, the slices enter the conveying bin through the replacement discharge pipe. Nitrogen is input to the bottom of the conveying bin through the nitrogen inlet pipe of the conveying bin, and the oxygen in the bin is discharged from the top of the conveying bin. The oxygen enters the deoxygenation device through the oxygen outlet pipe;

[0067] Step 4: Slices are completely mixed: The wet PA66 slices in the conveying bin are conveyed into the mixing bin by the power of fan A, and then the slices in the mixing bin are put into the storage bin again and the above steps 1, 2 and 3 are repeated ≥ 2 times until the slices are completely mixed;

[0068] Step 5: Dehumidification of slices: The wet PA66 slices that are completely mixed in the conveying bin are transported into the feed bin by the power of fan A, and then enter the drying tower through the discharge pipe of the feed bin. Dry hot nitrogen enters the drying tower. After drying the slices, the nitrogen with moisture is discharged from the top of the drying tower and then passes through the nitrogen circulation regeneration module to form convection in the drying tower. The moisture in the slices is taken away within a certain period of time, and 800-1000ppm dry PA66 slices are prepared. The moisture content of the slices in the drying tower is detected in real time by the moisture meter. When the moisture content is between 800-1000ppm, the control valve on the drying discharge pipe is opened, and the dry PA66 slices will enter the discharge bin. Otherwise, the drying will continue.

[0069] The oxygen content of the nitrogen gas introduced in the present invention is controlled at 1×10 -5 , nitrogen flow rate is 800~1200m 3 / h, the heating temperature of the nitrogen heating device is 85~98℃, and the dew point temperature of nitrogen in the drying tower is -10±2℃;

[0070] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A civilian nylon 66 chip drying system, characterized in that: It includes a storage bin, a replacement bin, a conveying bin, a mixing bin, a deoxidation device, a vacuum pump, a fan A, a feed bin, a drying tower, a moisture meter, and a discharge bin; the drying tower is connected to a nitrogen circulation regeneration module; The storage bin is connected to the replacement bin through a storage discharge pipe, the other end of the storage bin is connected to the mixing bin through a mixing discharge pipe, the other end of the replacement bin is connected to the conveying bin through a replacement discharge pipe, the other end of the conveying bin is connected to the fan A through a conveying discharge pipe, the fan A is connected to the feed bin through a feed bin feed pipe, the feed bin is connected to the drying tower through a feed bin discharge pipe, the feed bin feed pipe is connected to the mixing bin through a mixing feed pipe, the drying tower is connected to a moisture meter, and the drying tower is connected to the discharge bin through a drying discharge pipe; The replacement chamber is connected to the deoxygenation device via a replacement oxygen outlet pipe, and the delivery chamber is connected to the deoxygenation device via an delivery oxygen outlet pipe; The replacement bin and the delivery bin are respectively connected with a replacement bin nitrogen inlet pipe and a delivery bin nitrogen inlet pipe.

2. The civilian nylon 66 chip drying system according to claim 1, characterized in that: The nitrogen circulation regeneration module includes dust collector A, dew point temperature tester, dehumidification device, dust collector B, heating device, and fan B; The drying tower is connected to the dust collector A through the drying outlet pipe, the dust collector A is connected to the dew point temperature tester through the dust removal outlet pipe, the dew point temperature tester is connected to the dehumidification device through the dew point outlet pipe, the dehumidification device is connected to the dust collector B through the dehumidification outlet pipe, the dust collector B is connected to the fan B through the dust removal air pipe, the fan B is connected to the heating device through the fan outlet pipe, and the heating device is connected to the drying tower through the heating outlet pipe.

3. The civilian nylon 66 chip drying system according to claim 1, characterized in that: The deoxidation device is communicated with a vacuum pump.

4. The civilian nylon 66 chip drying system according to claim 1, characterized in that: Ball valves are provided on the storage discharge pipe, the replacement discharge pipe, the replacement oxygen outlet pipe, the oxygen delivery outlet pipe and the feed bin discharge pipe.

5. The civilian nylon 66 chip drying system according to claim 1, characterized in that: Control valves are provided on the conveying discharge pipe and the drying discharge pipe.

6. The civilian nylon 66 chip drying system according to claim 2, characterized in that: Three-way ball valves are provided on the feed bin feed pipe, drying outlet pipe, dust removal outlet pipe, dew point outlet pipe, dehumidification outlet pipe and dust removal air pipe, wherein the dehumidification outlet pipe has a pair of three-way ball valves.

7. The civilian nylon 66 chip drying system according to claim 6, characterized in that: The dehumidification outlet pipe is provided with a pair of three-way ball valves, specifically including a three-way ball valve A and a three-way ball valve B. A first bypass pipe is connected between the three-way ball valve of the drying outlet pipe and the three-way ball valve of the dust removal outlet pipe, a second bypass pipe is connected between the three-way ball valve of the dew point outlet pipe and the three-way ball valve A of the dehumidification outlet pipe, and a third bypass pipe is connected between the three-way ball valve of the dust removal pipe and the three-way ball valve B of the dehumidification outlet pipe.

8. The civilian nylon 66 chip drying system according to claim 1, characterized in that: The top of the storage bin is provided with a slice feed pipe, the slice feed pipe is provided with a feed control valve, the bottom of the storage bin is provided with a storage conveying pipe, the inside of the storage bin is provided with a plurality of discharge pipes, the ends of the plurality of discharge pipes are connected to the storage conveying pipe, the storage conveying pipe is provided with a discharge control valve, and the end of the storage conveying pipe is connected to the storage discharge pipe.

9. The civilian nylon 66 chip drying system according to claim 2, characterized in that: The dehumidification device includes a four-way ball valve provided at the input end, a four-way ball valve provided at the output end, a dehumidification device A, a dehumidification device B, a condensation tank and a fan, the dew point outlet pipe is connected to the four-way ball valve at the input end, the four-way ball valve at the input end is also connected to a dehumidification inlet pipe A, a condensation inlet pipe and a dehumidification inlet pipe B, the dehumidification inlet pipe A is connected to the dehumidification device A, the condensation inlet pipe is connected to the condensation tank, and the dehumidification inlet pipe B is connected to the dehumidification device B; A dehumidification condensation connecting pipe is connected between the dehumidification device A and the condensation tank, a fan air inlet pipe is connected between the condensation tank and the fan, and a fan air outlet pipe is connected between the fan and the four-way ball valve at the output end; A dehumidification outlet pipe A is connected between the dehumidification device A and the four-way ball valve at the output end; A dehumidification outlet pipe B is connected between the dehumidification device B and the four-way ball valve at the output end; The four-way ball valve at the output end is connected to the dehumidification outlet pipe.

10. A method for drying civilian nylon 66 chips, implemented by a civilian nylon 66 chip drying system according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: Preliminary mixing of slices: wet PA66 slices enter from the storage silo port, and after preliminary mixing in the storage silo, the slices enter the replacement silo through the pipeline; Step 2: Initial deoxygenation: nitrogen is introduced into the bottom of the replacement chamber through the nitrogen inlet pipe, so that the oxygen in the chamber is discharged from the top of the replacement chamber, and the discharged oxygen enters the deoxygenation device through the replacement oxygen outlet pipe; Step 3, thorough deoxygenation: After the replacement bin is deoxygenated, the slices enter the conveying bin through the replacement discharge pipe. Nitrogen is input into the bottom of the conveying bin through the nitrogen inlet pipe on the conveying bin, and the oxygen in the bin is discharged from the top of the conveying bin. The oxygen enters the deoxygenation device through the oxygen delivery outlet pipe; Step 4: Slices are completely mixed: The wet PA66 slices in the conveying bin are conveyed into the mixing bin by the power of fan A, and then the slices in the mixing bin are put into the storage bin again and the above steps 1, 2 and 3 are repeated ≥ 2 times until the slices are completely mixed; Step 5: Slice dehumidification: The completely mixed wet PA66 slices in the conveying bin are transported into the feed bin by fan A, and then enter the drying tower through the discharge pipe of the feed bin. Dry hot nitrogen enters the drying tower. After drying the slices, the nitrogen with moisture is discharged from the top of the drying tower and then passes through the nitrogen circulation regeneration module to form convection in the drying tower. The moisture in the slices is removed within a certain period of time, and 800-1000ppm dry PA66 slices are prepared. The moisture content of the slices in the drying tower is detected in real time by a moisture meter. When the moisture content is between 800-1000ppm, the dry PA66 slices are output to the discharge bin. Otherwise, the drying continues.

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