CN113244745A

CN113244745A - Continuous solid-phase tackifying system and processing method for nylon slices

Info

Publication number: CN113244745A
Application number: CN202110648566.5A
Authority: CN
Inventors: 徐以昌; 韩静; 张立峰; 辛建建; 张伟; 马风军; 张鹏; 张志刚; 支安东; 张燕斌; 张积玉
Original assignee: Shandong Honor Energy Technology Co ltd
Current assignee: Shandong Honor Energy Technology Co ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2021-08-13

Abstract

The invention relates to the technical field of polyamide production, in particular to a continuous solid-phase tackifying system for nylon chips, which comprises a feeding system, a tackifying tower, a bulk material nitrogen feeding device and a cooling tower, wherein the downstream of the feeding system is connected with the tackifying tower, the bulk material nitrogen feeding device is connected with the interior of the tackifying tower and is used for conveying nitrogen gas to the interior of the tackifying tower, the tackifying tower is used for realizing continuous tackifying treatment on the nylon chips entering the tackifying tower, and the cooling tower is connected and arranged at the downstream of the tackifying tower and is used for cooling the nylon chips after tackifying treatment. In the system and the processing method, the reaction temperature in the tackifying tower is controlled to be lower, the heating temperature of the nylon slices is above the glass transition temperature and below the melting point, and side reactions such as degradation do not occur; and can effectively improve the molecular weight of the polymer.

Description

Continuous solid-phase tackifying system and processing method for nylon slices

Technical Field

The invention relates to the technical field of polyamide production, in particular to a continuous solid-phase tackifying system and a processing method for nylon chips.

Background

Nylon, one of five engineering plastics, has high tensile strength, large elastic modulus, excellent wear resistance and self-lubricating property, and is widely applied to industries such as automobile manufacturing, electronic and electric products, mechanical equipment, packaging and the like. The nylon is a wide variety of types, including nylon 6, nylon 66, nylon 11, nylon 12, nylon 46, nylon 610, nylon 612, nylon 1010, and the like, and new products developed in recent years, such as semi-aromatic nylon 6T and specialty nylon. Wherein the yield of nylon 6 and nylon 66 is the maximum, and accounts for more than 90 percent of the yield of nylon.

Industrial nylons require a high relative strength and a high relative viscosity. Conventional polymerization gives low viscosity nylon 6 chips (viscosity of 2.2-3.0), while nylon 66 has a lower viscosity than nylon 6, which limits its range of application.

The principle of the method is that nylon chips with relatively low molecular weight are heated to a temperature higher than the glass transition temperature and lower than the melting point, solid-phase polymerization reaction further occurs inside the chips, by-product small molecules (water) are diffused from the inside of the chips, and the by-product small molecules (water) are carried out of a reaction system by means of vacuum or inert gas. With the constant diffusion of small molecules. Polymerization reaction inside the slice is continuously carried out, and the relative molecular mass is continuously improved.

Disclosure of Invention

In order to solve one of the technical problems, the invention adopts the technical scheme that: the continuous solid-phase tackifying system for the nylon chips comprises a feeding system, a tackifying tower, a nitrogen circulating system and a cooling tower, wherein the downstream of the feeding system is connected with the tackifying tower, the nitrogen circulating system is connected with the inside of the tackifying tower and used for conveying nitrogen to the inside of the tackifying tower, the tackifying tower is used for realizing continuous tackifying treatment on the nylon chips entering the tackifying tower, and the cooling tower is connected and arranged at the downstream of the tackifying tower and used for cooling the nylon chips subjected to tackifying treatment.

In any of the above schemes, preferably, the tackifying tower comprises a tackifying tower body which is hollow and provided with a nitrogen gas outlet at one side of the top, an upper conical pipe and a lower conical pipe are respectively arranged at the top and the bottom of the tackifying tower body, a conical pipe feed inlet is arranged at the top of the upper conical pipe, a conical pipe discharge outlet is arranged at the bottom of the lower conical pipe, and a plurality of first-stage air distribution homogenizers and second-stage air distribution homogenizers which are alternately arranged are sequentially installed in an inner cavity of the tackifying tower body from top to bottom at intervals.

In any of the above schemes, preferably, the primary air distribution homogenizer and the secondary air distribution homogenizer are respectively used for realizing uniform distribution of nylon chips falling into the inner cavity of the tower body 1.

In any of the above schemes, preferably, an upper opening material homogenizer is arranged at the inner cavity part of the upper conical tube, and a lower opening material homogenizer is arranged at the inner cavity part of the lower conical tube; the tackifying tower body, each primary air distribution homogenizer, each secondary air distribution homogenizer, the upper opening homogenizer and the lower opening homogenizer are coaxially arranged.

In any of the above schemes, preferably, the first-stage air distribution equalizer comprises a first-stage equalizing upper taper sleeve which is relatively fixed with and coaxially arranged with the inner cavity of the tackifying tower body, a through first-stage central equalizing channel is arranged in the middle of the first-stage equalizing upper taper sleeve, the first-stage equalizing upper taper sleeve and the tackifying tower body form an outer equalizing channel, and a first-stage annular air inlet channel is formed in a space between two rings of the first-stage equalizing upper taper sleeve.

In any of the above schemes, preferably, the second-stage air distribution homogenizer comprises a second-stage homogenizing cone fixed relatively to and coaxially arranged with the inner cavity of the tower body, and further comprises a second-stage outer air distribution homogenizing inverted cone connected with the tower body, the second-stage outer air distribution homogenizing inverted cone and the second-stage homogenizing cone form a homogenizing channel, and a space between two rings of the second-stage homogenizing cone forms a second-stage annular air inlet inner channel. And the secondary external air distribution material homogenizing inverted cone and the tackifying tower body form a secondary annular air inlet external channel.

In any of the above schemes, preferably, the lower opening homogenizer is composed of a third lower opening homogenizer, a second lower opening homogenizer and a first lower opening homogenizer which are coaxially arranged from top to bottom.

In any of the above schemes, preferably, the third-level lower opening material homogenizer includes a third-level middle cone and a third-level outer cone which are coaxially arranged, a third-level inner annular lower material homogenizing channel is formed between the third-level outer cone and the third-level middle cone, and a third-level outer annular lower material homogenizing channel is formed between the third-level outer cone and the inner wall of the lower cone.

In any of the above schemes, preferably, the second-stage lower mouth material homogenizer includes a second-stage outer sleeve cone disposed under the third-stage intermediate cone and coaxial with the third-stage intermediate cone, the center of the second-stage outer sleeve cone is a second-stage inner annular lower material homogenizing channel, and a second-stage outer annular lower material homogenizing channel is formed between the second-stage outer sleeve cone and the inner wall of the lower cone.

In any of the above schemes, preferably, the primary lower opening material homogenizer includes a primary intermediate cone disposed under the secondary intermediate cone and coaxially disposed therewith, and a primary outer annular lower material homogenizing passage is formed between the inner walls of the primary intermediate cone and the lower cone.

In any of the above schemes, preferably, the upper opening homogenizer is composed of a primary upper opening homogenizer and a secondary upper opening homogenizer which are coaxially arranged from top to bottom.

In any of the above schemes, preferably, the primary upper-opening material homogenizer comprises a primary upper cone coaxially and fixedly arranged inside the upper cone, and a space between the primary upper cone and the inner wall of the upper cone forms a primary annular upper material homogenizing channel.

In any of the above schemes, preferably, the secondary upper opening material homogenizer comprises a secondary upper inverted cone sleeve which is coaxial and fixedly arranged inside the upper cone pipe, a through secondary central upper material homogenizing channel is arranged in the middle of the secondary upper inverted cone sleeve, and a secondary outer annular upper material homogenizing channel is formed in a space between the secondary upper inverted cone sleeve and the inner wall of the upper cone pipe.

The thickening tower can realize that nylon particles flow in a plug flow mode from top to bottom under the action of uniform bulk materials and material distribution of the plurality of material homogenizing assemblies after the nylon slices are received and enter the thickening tower, so that the residence time of the nylon slices in the thickening tower is consistent, the thickening uniformity of the nylon slices is finally ensured, and meanwhile, the adhesion caused by the non-flowing of local materials is prevented.

The upper material homogenizer mainly disperses the material to the slices just entering from the upper conical pipe feed inlet, so that the material is firstly distributed, the material dispersion effect is improved, and the material distribution effect is ensured.

In any of the above schemes, preferably, the included angles of the tops of the third-level lower mouth material homogenizer, the second-level lower mouth material homogenizer and the first-level lower mouth material homogenizer are all 30-50 °. The arrangement of the proper taper and the included angle can effectively ensure the effectiveness of the bulk materials, and the included angle is not too large or too small easily, so that the height size of the whole upper cloth inner cone can be effectively controlled while the bulk material effect and speed are ensured.

When the nylon chips are contacted with nitrogen in the inner cavity of the tackifying tower body and are fully tackified, the treated nylon chips can be better ensured to be effectively distributed and gathered by the lower opening material homogenizer, and the outward discharging effect of the nylon chips is improved.

The angle of each part of the three-level lower opening homogenizer is set to be proper in taper and included angle, so that the effect of discharging and gathering materials can be effectively guaranteed, the included angle is not too large or too small, the discharging and gathering effect and proper speed can be guaranteed, and the height and the size of the inner cone of the whole lower material can be effectively controlled to be matched with the size of the inner cavity of the tackifying tower body.

Guarantee can guarantee even transition when receiving the nylon material that comes from the top, guarantee smoothness nature, the homogeneity when the matching degree of size can guarantee outside guide effectively, improve ejection of compact effect.

A plurality of alternately arranged primary air distributing homogenizers and secondary air distributing homogenizers can be sequentially arranged from the upper part to the lower part, so that multiple times of distributing and guiding bulk materials can be continuously carried out in the process of nylon material tackifying treatment, the materials can be ensured to be in full contact with nitrogen entering the nylon material tackifying treatment process, and the tackifying treatment effect is ensured.

The proper taper and the included angle are set to effectively ensure the effectiveness of the bulk materials, and the included angle is not too large or too small easily, so that the height of the whole inner air distribution equalizing cone can be effectively controlled while the bulk material effect and speed are ensured.

In any of the above schemes, preferably, the first-stage air distribution homogenizer is connected with at least one inner air inlet pipe communicated with an inner cavity thereof through an air inlet, and an outer end of each inner air inlet pipe extends to the outside of the tower body.

In any of the above schemes, preferably, the secondary air distribution homogenizer is connected with at least one inner air inlet pipe communicated with an inner cavity thereof through an air inlet, and an outer end of each inner air inlet pipe extends to the outside of the tower body. And the secondary air distribution homogenizer is connected with at least one outer air inlet pipe communicated with the outer cavity of the secondary air distribution homogenizer through an air inlet, and the outer end of each outer air inlet pipe extends to the outside of the tackifying tower body.

In any of the above embodiments, preferably, each of the inner air inlet duct and the outer air inlet duct is configured to receive nitrogen gas from outside.

The combined action of the first-level air distributing homogenizer, the second-level air distributing homogenizer and the lower-level air distributing homogenizer which are alternately arranged in the tackifying tower body realizes that nylon particles flow in a plug flow mode from top to bottom, ensures that the residence time of nylon chips in the tackifying tower is consistent, finally ensures the tackifying uniformity of the nylon chips, and prevents local materials from flowing and adhering.

And blowing nitrogen upwards from the lower part, sequentially distributing the slices downwards from the upper part, fully contacting the nitrogen with the nylon slices in the process, and staying and treating the nylon slices in a tackifying tower for 12-36 hours to finish the tackifying process.

In any of the above schemes, preferably, the nitrogen washing is divided into two stages, the two stages adopt independent water pumps, heat exchangers and circulating water pipelines, the washing water for lower washing is cooled by the circulating water, the circulating water used here can meet the requirements through a water cooling tower, and the washing water for upper washing is cooled by ice water. The lower washing is used for carrying out primary washing and cooling on the nitrogen, and the upper washing is used for further carrying out washing and cooling on the nitrogen to meet the air outlet requirement of the washing tower. The upper spraying is carried out on the basis of the lower washing and cooling, so that the required cooling capacity is greatly reduced, and the energy consumption for preparing the cooling capacity is greatly reduced.

The washing tower includes the washing tower body the bottom installation base of washing tower body the air outlet is installed at the top of washing tower body the air intake is installed to washing tower body's lower part one side go up spray set and spray set are installed respectively to the upper portion and the lower part of the inner chamber of washing tower body go up spray set with the internal intracavity of washing tower between the spray set is installed one and is gone up bulk cargo air inlet unit top-down installs the perpendicular hanging cover of a plurality of at intervals in proper order on the washing tower body and overhauls the manhole.

This device adopts spray set and spray set down to realize dual spraying, can improve the effect that sprays the washing effectively, guarantees better to the nitrogen gas utilization washing water that gets into spray fast, improves washing speed effectively.

Meanwhile, the bulk material air inlet device is arranged to separate the upper part and the lower part by spraying, and the upper part can be washed and cooled by adopting low-temperature washing water.

The washing tower washes and cools the nitrogen through the washing water, the cooling of the washing water mainly depends on the heat exchanger, and the washing water with different temperatures can be obtained by adopting different cooling media for different heat exchangers.

The spraying adopts the mode of spraying washing water from top to bottom, nitrogen enters from an air inlet at the lower part of the washing tower body, the water is sprayed on the filler from top to bottom and flows down along the surface of the filler to form a water film on the surface of the filler, the nitrogen and liquid continuously pass through gaps between the fillers in a counter-current manner from bottom to top, and the gas-liquid two phases are closely contacted on the surface of the filler to carry out heat and mass transfer.

The nitrogen gas firstly realizes primary spraying and cooling through the lower spraying device, and then continues upwards and then realizes secondary spraying and cooling through the upper spraying device, so that the washing and cooling effects are improved.

In any of the above aspects, preferably, a wire mesh demister is installed in the air outlet. The wire mesh demister arranged at the outlet can rapidly remove the entrainment entrained in the tail gas.

It is preferred in any preceding scheme to go up spray set and include a plurality of fixed mounting and be in last fixing base on the inner chamber lateral wall of washing tower body, the inner of the last washing water inlet tube that a level set up extends the inner of the inner chamber of washing tower body is inside and fixes on the last fixing base that corresponds through the upper portion U type clamp that corresponds the outer end of going up the washing water inlet tube is equipped with the washing water import the middle section bottom interval of going up the washing water inlet tube is provided with a plurality of and goes up the nozzle.

The upper washing water inlet, the lower washing water inlet and the corresponding washing water outlet are respectively matched with the corresponding circulating water pump and the heat exchanger through pipelines.

The upper spraying device can enter through an upper washing water inlet after receiving low-temperature water flow of an external circulating water pump, then the water flow is continuously sprayed out by an upper nozzle due to high pressure action of the water flow, is sprayed on an upper packing layer and flows down along the surface of the packing to form a water film on the surface of the packing, nitrogen continuously passes through gaps between the packing in a countercurrent mode with liquid from bottom to top, gas-liquid two phases are in close contact with each other on the surface of the packing to conduct heat and mass transfer, and nitrogen containing impurities is fully washed and cooled.

In any of the above schemes, preferably, an upper washing water replenishing port is installed on the side wall of the washing tower body below the upper washing water inlet. When the upper spray washing water is insufficient, water can be supplemented into the tower through the upper washing water supplementing opening, and the water supply is sufficient.

It is preferred in any of the above-mentioned schemes, spray set includes a plurality of fixed mounting and is in lower fixing base on the inner chamber lateral wall of washing tower body, the inner of the lower wash water inlet tube that a level set up extends the inner of washing tower body's inner chamber is inside and fixes on the lower fixing base that corresponds through the lower part U type clamp that corresponds the outer end of lower wash water inlet tube is equipped with down the wash water import the middle section bottom interval of lower wash water inlet tube is provided with nozzle under a plurality of.

Lower spray set can get into through washing water import down earlier after receiving outside circulating water pump's rivers, then because the high pressure effect that rivers exist can be lasted the blowout by lower nozzle, the injection is on the packing layer of lower part, and flow down along the packing surface, form the water film on the packing surface, nitrogen gas is the continuous gap between packing through countercurrent with liquid from bottom to top, carry out heat transfer mass transfer in packing surface gas-liquid two-phase intimate contact, the realization is fully washed the nitrogen gas that contains impurity, the cooling, the washing is sprayed better in the last spray set's of cooperation top effect realization, the effect and the efficiency of washing are improved effectively, can carry out quick washing to a relatively large amount of nitrogen gas.

In any of the above schemes, preferably, a lower washing water replenishing port is installed on the side wall of the washing tower body below the lower washing water inlet. When the sprayed washing water is insufficient, the water can be supplemented into the tower through the lower washing water supplementing port, so that the water supply is sufficient.

In any of the above embodiments, it is preferable that each of the upper nozzles and each of the lower nozzles is a tapered spiral nozzle. The conical spiral nozzle has the effects of better ensuring the spraying effect and improving the contact sufficiency of the spraying washing water and the nitrogen.

Preferably in any one of the above schemes, the upper bulk material air inlet device comprises an upper hole spraying inclined plate which is obliquely arranged on the inner cavity side wall of the washing tower body, the upper part of the upper hole spraying inclined plate corresponds to the side wall of the washing tower body, and an upper liquid level meter interface, an overflow port, a washing water outlet, a lower liquid level meter interface and a sewage outlet are sequentially arranged from top to bottom on the side wall of the washing tower body, and a plurality of vertically arranged air inlet pipes are arranged above the upper hole spraying inclined plate along the surface interval of the upper hole spraying inclined plate.

Go up bulk cargo air inlet unit and separate washing water from top to bottom, prevent that the liquid that sprays on from getting into and spray down, spray the vertical inlet air tuber pipe entering of bulk cargo air inlet unit on the gaseous accessible after washing down and spray.

The upper and lower spraying lower parts are all provided with a certain amount of water, so that impurities in water can naturally settle, a liquid level meter is arranged for detecting the liquid level of the water, water is supplemented through a water supplementing port when the liquid level is low, and redundant discharge is realized through an overflow port when the liquid level is high.

Meanwhile, the liquid level meter connected with the upper interface and the lower interface of the liquid level meter can effectively observe and measure the current water level state.

The drain can be with spraying the completion back, when wasing washing tower body inside, the adhesion sprays the hang plate at last foraminiferous and sprays the dirty realization outside discharge on the hang plate down.

The proper inclination angle can ensure that the upper and lower sprays can be discharged when the washing water is discharged.

In any of the above schemes, preferably, a conical tube protective cap is fixedly mounted on the top of each air intake duct, and a space is provided between each conical tube protective cap and the top of the corresponding air intake duct.

The taper pipe protective cap can effectively prevent the sprayed liquid from entering the air inlet pipe, ensure that the entering nitrogen can be rapidly discharged from the peripheral space, reduce the probability that the sprayed liquid enters the lower spraying part, and play the role of air equalization

In any of the above schemes, preferably, a lower spraying inclined plate is installed in the inner cavity of the washing tower body below the lower spraying device, and the inlet air enters through an air inlet on the side wall of the washing tower.

In any of the above schemes, preferably, a packing layer with a certain thickness is installed in the inner cavity of the washing tower body below the upper spraying device in a matching manner.

In any of the above schemes, preferably, a packing layer with a certain thickness is installed in the inner cavity of the washing tower body below the lower spraying device in a matching manner.

In any of the above schemes, preferably, the feeding system employs a metering conveying device, a feed inlet of the metering conveying device is used for receiving raw materials, and an outlet of the metering conveying device is used for communicating with an inlet end of the tackifying tower.

The metering and conveying device can be an existing product, and the equipment does not have design improvement points and is not described in detail.

In any of the above schemes, preferably, the nitrogen circulation system includes a nitrogen preheater, a lower inlet of the nitrogen preheater is connected to the top of the tackifying tower and is configured to receive hot nitrogen discharged from the tackifying tower, an upper outlet of the nitrogen preheater is connected to an inlet of a nitrogen processing device, an upper inlet of the nitrogen preheater is connected to a top outlet of the nitrogen processing device, a lower outlet of the nitrogen preheater is connected to a multi-stage nitrogen conveying assembly, and the multi-stage nitrogen conveying assembly is configured to convey nitrogen for increasing temperature in the tackifying tower in multiple ways.

In any of the above embodiments, preferably, the nitrogen circulation system includes a multi-stage nitrogen gas delivery assembly, and the multi-stage nitrogen gas delivery assembly is respectively communicated with the upper part, the middle part and the lower part of the tackifying tower.

In any of the above schemes, preferably, the multi-stage nitrogen conveying assembly includes a plurality of sets of one-stage nitrogen conveying branch parts, two-stage nitrogen conveying branch parts and three-stage nitrogen conveying branch parts which are arranged in parallel, and the one-stage nitrogen conveying branch parts, the two-stage nitrogen conveying branch parts and the three-stage nitrogen conveying branch parts are all connected with the lower outlet end of the nitrogen preheater through a header pipe.

In any of the above schemes, preferably, the primary nitrogen conveying branch component comprises a primary conveying branch pipeline, and a primary nitrogen press and a primary heat exchanger are sequentially installed in series on the primary conveying branch pipeline according to the flowing direction of nitrogen;

in any of the above schemes, preferably, the primary nitrogen conveying branch component includes a secondary conveying branch pipeline, and a secondary nitrogen press and a secondary heat exchanger are sequentially installed in series on the secondary conveying branch pipeline according to the flowing direction of nitrogen;

in any of the above schemes, preferably, the three-stage nitrogen gas delivery branch component includes a three-stage delivery branch pipeline, and a three-stage nitrogen press, a three-stage deaerator and a three-stage heat exchanger are sequentially installed in series on the three-stage delivery branch pipeline according to the flow direction of nitrogen gas.

In any of the above schemes, preferably, the nitrogen circulating system includes a washing tower, a top outlet end of the washing tower is connected with an upper inlet end of the nitrogen preheater through an outlet pipeline, a demister unit is installed on the outlet pipeline, a lower inlet end of the washing tower is connected with an upper outlet end of the nitrogen preheater through a pipeline, a circulating pipeline is arranged on one side of the washing tower, an inlet end of the circulating pipeline is connected with a bottom outlet end of the washing tower, a reflux end of the circulating pipeline is connected with a reflux port on the upper part of the washing tower, and the circulating pipeline is provided with a circulating water pump and a circulating water heat exchanger unit in series according to the flowing direction of circulating water.

In any of the above schemes, preferably, a high-purity nitrogen gas supplementing port is arranged on a pipeline between the tackifying tower and the nitrogen gas preheater, and the high-purity nitrogen gas supplementing port can supplement consumed nitrogen gas in time, so that the continuity of the nitrogen gas of the system is effectively ensured.

The invention also provides a continuous solid-phase tackifying treatment method for nylon chips, which comprises the following steps:

s1: metering and conveying nylon chip materials and enabling the materials to enter a tackifying tower of a nylon chip continuous solid-phase tackifying system;

s2: the nylon chips flow in a plug flow mode from top to bottom in the tackifying tower;

s3: introducing nitrogen into the tackifying tower and fully contacting the tackifying tower with the nylon chips;

the nitrogen provided here serves to carry away small molecules (water) which are by-products of the viscosification process.

The specific steps of introducing nitrogen in the S3 are as follows: the nitrogen enters the inside of the tackifying tower from the upper part, the middle part and the lower part of the tackifying tower in three strands respectively, and each nitrogen pipeline is provided with an independent nitrogen press and a nitrogen heat exchanger for accurately controlling the flow and the temperature of each strand of nitrogen to realize the accurate control of the temperature of the inner section of the tackifying tower. At least one of the two ways can be provided with a deaerator, and the deaerator can deaerate nitrogen to ensure the purity of the nitrogen.

The nylon particles flow from top to bottom in a plug flow mode through the distribution of the internal parts in the tackifying tower, so that the residence time of the nylon chips in the tackifying tower is consistent, the tackifying uniformity of the nylon chips is finally ensured, and the adhesion caused by the non-flowing of local materials is prevented.

The nylon slices are heated by three strands of nitrogen at the upper, middle and lower parts in the tackifying tower, the temperature of the upper slices is controlled to be 80-150 ℃, the temperature of the middle slices is controlled to be 140-170 ℃, and the temperature of the lower slices is controlled to be 160-180 ℃.

The system adopts a nitrogen closed cycle, hot nitrogen is discharged from the top of the tackifying tower, enters a nitrogen preheater to exchange heat with cold nitrogen from a demister, enters a washing tower from the lower part of the washing tower, and is washed and cooled by the washing tower to remove carried by-product micromolecules and moisture in the tackifying process.

The washed nitrogen enters a demister for demisting and drying, enters a nitrogen preheater for preheating, and then enters a tackifying tower in three strands.

The hot nitrogen entering the upper part of the tackifying tower is a part after washing, demisting and preheating by a nitrogen preheater, and the nitrogen enters the tackifying tower from the upper part after being pressurized by a primary nitrogen press and heated by a primary nitrogen heat exchanger.

The hot nitrogen entering the middle part of the tackifying tower is a part after washing, demisting and preheating by a nitrogen preheater, and the nitrogen enters the tackifying tower from the middle part after being pressurized by a secondary nitrogen press and heated by a secondary nitrogen heat exchanger.

The hot nitrogen entering the lower part of the tackifying tower is a part after washing, demisting and preheating by a nitrogen preheater, and the nitrogen enters the tackifying tower from the lower part after being pressurized by a three-stage nitrogen press, deoxygenated by a three-stage deoxygenator and heated by a three-stage nitrogen heat exchanger.

S4: keeping the steps from S2 to S3, and enabling the nylon chips to stay in a tackifying tower for 12-36 hours to finish the tackifying process;

s5: after the tackifying process is finished, the nylon slices tackified by the tackifying tower enter a cooling tower to be cooled;

s6: continuously cooling under the cooling action of a circulating water cooler of the cooling tower, and conveying the qualified product into a finished product bin through pneumatic transmission.

In any of the above embodiments, it is preferable that the nylon chip continuous solid-phase thickening system described in S1 is the nylon chip continuous solid-phase thickening system described in any one of claims 1 to 7.

In any of the above schemes, preferably, the temperature of the slices at the upper part in the tackifying tower is controlled to be 80-150 ℃, the temperature of the slices at the middle part is controlled to be 140-170 ℃, and the temperature of the slices at the lower part is controlled to be 160-180 ℃.

The invention has the beneficial effects that:

1) in the system and the processing method, the reaction temperature in the tackifying tower is controlled to be lower, the heating temperature of the nylon slices is above the glass transition temperature and below the melting point, and side reactions such as degradation do not occur; and can effectively improve the molecular weight of the polymer.

2) The nitrogen is divided into three streams and enters different parts of the tackifying tower, each path of nitrogen is provided with an independent nitrogen press and a nitrogen heat exchanger, and the flow and the temperature of each stream of nitrogen can be accurately controlled to realize accurate control of the temperature of the slices in the tackifying tower.

3) The system can remove micromolecules and moisture which are byproducts in the tackifying process in time through the washing tower, and the deaerator can ensure the purity of nitrogen entering the tackifying tower through deoxidation.

4) The system is provided with the deaerator in the nitrogen at the lower part of the tackifying tower, so that the volume of the deaerator can be reduced, and the investment cost and the operation cost are lower.

5) The nitrogen washing of the system is divided into two stages, the two stages adopt independent water pumps, heat exchangers and circulating water pipelines, the washing water for lower washing is cooled by circulating water, the circulating water used in the lower washing can meet the requirements through a water cooling tower, and the low-temperature washing water for upper washing is cooled by ice water. The lower washing is used for carrying out primary washing and cooling on the nitrogen, and the upper washing is used for further carrying out washing and cooling on the nitrogen to meet the air outlet requirement of the washing tower. The upper spraying is carried out on the basis of the lower washing and cooling, so that the required cooling capacity is greatly reduced, and the energy consumption for preparing the cooling capacity is greatly reduced. To further ensure the outlet air temperature of the washing tower and the washing sub-program can be realized by continuously increasing the washing stages of the washing tower.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or components are generally identified by like reference numerals. In the drawings, elements or components are not necessarily drawn to scale.

FIG. 1 is a process flow diagram of the present invention.

FIG. 2 is a schematic view of the internal structure of the thickening tower of the present invention.

Fig. 3 is a schematic view of the internal structure of the cooling tower of the present invention.

The designations of the various reference numbers in FIGS. 1-3 are as follows: 1. a first-stage nitrogen press; 2. a primary heat exchanger; 3. a secondary nitrogen press; 4. a secondary heat exchanger; 5. a tertiary nitrogen press; 6. a deaerator; 7. a tertiary heat exchanger; 8. a tackifying tower; 9. a cooling tower; 10. a metering conveyor; 11. a nitrogen preheater; 12. a demister unit; 1201. a demister; 1202. opening a valve for demisting; 13. a washing tower; 14. a water circulating pump; 15. a tower circulating water heat exchanger unit; 1501. a tower circulating water heat exchanger; 1502. circularly opening the valve; 17. an upper opening material homogenizer; 18. a primary air distribution material homogenizer; 19. a secondary air distribution material homogenizer; 20. a lower opening material homogenizer; 21. a nitrogen outlet; 22. an upper conical pipe; 23. a lower conical pipe; 24. a taper pipe feed inlet; 25. a discharge hole of the taper pipe; 26. primary material homogenizing and taper sleeve feeding; 27. a primary central material homogenizing channel; 28. an outer material homogenizing channel; 29. a primary annular air inlet channel; 30. a second-stage homogenizing cone; 31. a second-stage external air distribution material homogenizing inverted cone barrel; 32. a material homogenizing channel; 33. a secondary annular air inlet inner channel; 34. a secondary annular air inlet outer channel; 35. a third-level lower opening material homogenizer; 36. a secondary lower opening material homogenizer; 37. a first-level lower opening material homogenizer; 38. a third-level middle vertebral body; 39. three-stage jacket centrum; 40. a third-stage inner annular lower material homogenizing channel; 41. a three-stage outer annular lower homogenizing passage; 42. a second-level jacket vertebral body; 43. a second-stage inner annular lower homogenizing channel; 44. a secondary outer annular lower homogenizing passage; 45. a first-level medial vertebral body; 46. a primary outer annular lower homogenizing passage; 47. a first-stage upper-opening material homogenizer; 48. a secondary upper opening material homogenizer; 49. a first-level upper cone; 50. a primary annular feeding and homogenizing channel; 51. a secondary upper inverted taper sleeve; 52. a material homogenizing channel is arranged in the secondary center; 53. a secondary outer annular upper material homogenizing channel; 54. washing the tower body; 55. installing a base; 56. an air outlet; 57. a vertical hanging cover maintenance manhole; 58. a wire mesh demister; 59. an upper fixed seat; 60. an upper washing water inlet pipe; 61. an upper U-shaped clamp; 62. an upper washing water inlet; 63. an upper nozzle; 64. a water replenishing port of upper washing water; 65. a lower fixed seat; 66. a lower washing water inlet pipe; 67. a lower washing water inlet; 68. a lower nozzle; 69. a lower washing water replenishing port; 70. the upper hole sprays the inclined plate; 71. an overflow port; 72. a wash water outlet; 73. a liquid level upper meter interface; 74. a lower interface of the liquid level meter; 75. a sewage draining outlet; 76. an air inlet duct; 77. a conical tube protective cap; 78. an intervening space; 79. downward spraying an inclined plate; 80. a lower U-shaped clamp; 81. an upper packing layer; 82. a lower packing layer; 83. an air inlet; 84. an upper spraying device; 85. a lower spraying device; 86. go up bulk cargo air inlet unit.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 to 3, the continuous solid-phase tackifying system for nylon chips comprises a feeding system 10, a tackifying tower 8, a nitrogen circulating system and a cooling tower 9, wherein the downstream of the feeding system 10 is connected with the tackifying tower 8, the nitrogen circulating system is connected with the inside of the tackifying tower 8 and is used for conveying nitrogen to the inside of the tackifying tower 8, the tackifying tower 8 is used for continuously tackifying the nylon chips entering the tackifying tower 8, and the cooling tower 9 is connected and arranged at the downstream of the tackifying tower 8 and is used for cooling the tackified nylon chips.

In any of the above schemes, preferably, the tackifying tower comprises a tackifying tower body which is hollow and provided with a nitrogen gas outlet 21 at one side of the top, an upper conical pipe 22 and a lower conical pipe 23 are respectively arranged at the top and the bottom of the tackifying tower body, a conical pipe feed inlet 24 is arranged at the top of the upper conical pipe 22, a conical pipe discharge outlet 25 is arranged at the bottom of the lower conical pipe 23, and a plurality of first-stage air distribution homogenizers 18 and second-stage air distribution homogenizers 19 which are alternately arranged are sequentially arranged in the inner cavity of the tackifying tower body from top to bottom at intervals.

In any of the above schemes, preferably, the primary air distributing homogenizer 18 and the secondary air distributing homogenizer 19 are respectively used for realizing uniform distribution of nylon chips falling into the inner cavity of the tower body.

In any of the above schemes, preferably, an upper mouth homogenizer 17 is disposed in the inner cavity of the upper conical tube 22, and a lower mouth homogenizer 20 is disposed in the inner cavity of the lower conical tube 23; the tackifying tower body 19, each first-stage air distribution homogenizer 18, each second-stage air distribution homogenizer 19, the upper-opening homogenizer 17 and the lower-opening homogenizer 20 are coaxially arranged.

In any of the above schemes, preferably, the primary air distribution equalizer 18 includes a primary equalizing upper taper sleeve 26 fixed relatively to and coaxially disposed with the inner cavity of the tower body, a primary central equalizing channel 27 is disposed in the middle of the primary equalizing upper taper sleeve 26, an outer equalizing channel 28 is formed between the primary equalizing upper taper sleeve 26 and the tower body, and a primary annular air inlet channel 29 is formed in a space between two rings of the primary equalizing upper taper sleeve 26.

In any of the above schemes, preferably, the second-stage air distribution homogenizer 19 includes a second-stage homogenizing cone 30 fixed relatively to and coaxially disposed with the inner cavity of the tower body, and further includes a second-stage outer air distribution homogenizing inverted cone 31 connected to the tower body, the second-stage outer air distribution homogenizing inverted cone 31 and the second-stage homogenizing cone 30 form a homogenizing channel 32, a space between two rings of the second-stage homogenizing cone 30 forms a second-stage annular air inlet inner channel 33, and the second-stage outer air distribution homogenizing inverted cone 31 and the tower body form a second-stage annular air inlet outer channel 34.

In any of the above schemes, preferably, the lower opening homogenizer 20 is composed of a third lower opening homogenizer 35, a second lower opening homogenizer 36, and a first lower opening homogenizer 37, which are coaxially arranged from top to bottom.

In any of the above schemes, preferably, the third-stage lower-opening homogenizer 35 includes a third-stage intermediate cone 38 and a third-stage outer cone 39 which are coaxially arranged, a third-stage inner annular lower homogenizing channel 40 is formed between the third-stage outer cone 39 and the third-stage intermediate cone 38, and a third-stage outer annular lower homogenizing channel 41 is formed between the third-stage outer cone 39 and the inner wall of the lower cone 23.

In any of the above schemes, it is preferable that the second-stage lower mouth material homogenizer 36 includes a second-stage outer sleeve cone 42 disposed under the third-stage intermediate cone 38 and coaxially disposed therewith, a second-stage inner annular lower material homogenizing channel 43 is disposed at the center of the second-stage outer sleeve cone 42, and a second-stage outer annular lower material homogenizing channel 44 is formed between the second-stage outer sleeve cone 42 and the inner wall of the lower cone pipe 23.

In any of the above schemes, it is preferable that the primary lower mouth homogenizer 37 includes a primary intermediate cone 45 disposed directly below the secondary intermediate cone and coaxially disposed therewith, and a primary outer annular lower homogenizing channel 46 is formed between the inner walls of the lower cone 23 and the primary intermediate cone 45.

In any of the above schemes, it is preferable that the top homogenizer 17 is composed of a primary top homogenizer 47 and a secondary top homogenizer 48 which are coaxially arranged from top to bottom.

In any of the above solutions, it is preferable that the primary upper-opening material homogenizer 47 includes a primary upper cone 49 coaxially and fixedly disposed inside the upper cone 22, and a space between the primary upper cone 49 and the inner wall of the upper cone 22 forms a primary annular upper material homogenizing channel 50.

In any of the above schemes, preferably, the secondary upper-opening material homogenizer 48 includes a secondary upper inverted cone sleeve 51 coaxially and fixedly disposed inside the upper cone 22, a through secondary central upper material homogenizing channel 52 is disposed in the middle of the secondary upper inverted cone sleeve 51, and a secondary outer annular upper material homogenizing channel 53 is formed in a space between the secondary upper inverted cone sleeve 51 and the inner wall of the upper cone 22.

The tackifying tower 8 can realize that nylon particles flow in a plug flow mode from top to bottom under the action of uniform bulk materials and material distribution of the plurality of material homogenizing assemblies after the nylon chips are received and enter the tackifying tower 8, so that the residence time of the nylon chips in the tackifying tower 8 is consistent, the tackifying uniformity of the nylon chips is finally ensured, and the adhesion caused by the non-flowing of local materials is prevented.

The upper homogenizing device 17 mainly disperses the material distribution for the slices just entering from the upper conical pipe feed inlet 24, so that the material distribution for the first time is realized, the material dispersion effect is improved, and the material distribution effect is ensured.

In any of the above schemes, preferably, the included angles of the tops of the third-stage lower-mouth homogenizer 35, the second-stage lower-mouth homogenizer 36 and the first-stage lower-mouth homogenizer 37 are all 30-50 °. The arrangement of the proper taper and the included angle can effectively ensure the effectiveness of the bulk materials, and the included angle is not too large or too small easily, so that the height size of the whole upper cloth inner cone can be effectively controlled while the bulk material effect and speed are ensured.

When the nylon chips are contacted with nitrogen and fully tackified in the inner cavity of the tackification tower body, the processed nylon chips can be better ensured to be effectively distributed and gathered by the lower opening material homogenizer 20, and the outward discharging effect of the nylon chips is improved.

The angle of each part of the three-level lower opening material equalizer 35 is set to be proper taper and included angle, so that the effect of discharging materials can be effectively guaranteed, the included angle is not too large or too small, the discharging material collecting effect and proper speed can be guaranteed, and the height and the size of the inner cavity of the lower cone pipe 23 can be effectively controlled to be matched with the height and the size of the inner cone body of the lower cloth.

The arranged plurality of primary air distributing homogenizers 18 and secondary air distributing homogenizers 19 which are alternately arranged can be sequentially arranged from the upper part to the lower part, so that the material can be continuously distributed and guided for many times in the process of nylon material tackifying treatment, the material can be ensured to be in full contact with nitrogen entering the material, and the tackifying treatment effect is ensured.

In any of the above schemes, preferably, the first-stage air distribution homogenizer 18 is connected with at least one inner air inlet pipe communicated with an inner cavity thereof through an air inlet, and an outer end of each inner air inlet pipe extends to the outside of the tower body.

In any of the above schemes, preferably, the secondary air distribution homogenizer 19 is connected with at least one inner air inlet pipe communicated with an inner cavity thereof through an air inlet, an outer end of each inner air inlet pipe extends to the outside of the tower body, the secondary air distribution homogenizer 19 is connected with at least one outer air inlet pipe communicated with an outer cavity thereof through an air inlet, and an outer end of each outer air inlet pipe extends to the outside of the tower body.

The combined action of an upper port homogenizer 17 in the tackifying tower 8, a first-level air distributing homogenizer 18 and a second-level air distributing homogenizer 19 which are alternately arranged on the tackifying tower body, and a lower port homogenizer 20 realizes that nylon particles flow in a plug flow manner from top to bottom, ensures that the residence time of nylon slices in the tackifying tower 8 is consistent, finally ensures the tackifying uniformity of the nylon slices, and simultaneously prevents local materials from flowing and adhering.

In any of the above schemes, preferably, the washing tower 13 includes a washing tower body 54, a base 55 is installed at the bottom of the washing tower body 54, an air outlet 56 is installed at the top of the washing tower body 54, an air inlet 83 is installed at one side of the lower portion of the washing tower body 54, an upper spraying device 84 and a lower spraying device 85 are respectively installed at the upper portion and the lower portion of an inner cavity of the washing tower body 54, an upper bulk material air inlet device 86 is installed in the inner cavity of the washing tower body 54 between the upper spraying device 84 and the lower spraying device 85, and a plurality of vertical hanging cover inspection manholes 57 are sequentially installed at intervals from top to bottom on the washing tower body 54.

This device adopts spray set 84 and lower spray set 85 to realize dual spraying, can improve effectively and spray the effect of washing, guarantees better to the nitrogen gas utilization washing water that gets into sprays fast, improves the washing speed effectively.

Meanwhile, the bulk material air inlet device 86 is arranged to separate the upper spray from the lower spray, and the upper spray can adopt low-temperature washing water to wash and cool the nitrogen.

The spraying adopts the mode of spraying washing water from top to bottom, nitrogen enters from an air inlet 83 at the lower part of the washing tower body 54, the water is sprayed on the filler from top to bottom and flows down along the surface of the filler to form a water film on the surface of the filler, the nitrogen and liquid continuously pass through gaps between the fillers in a counter-current manner from bottom to top, and the gas-liquid two phases are closely contacted on the surface of the filler to carry out heat and mass transfer.

The nitrogen firstly realizes primary spraying and cooling through the lower spraying device 85, and then continuously upwards realizes secondary spraying and cooling through the upper spraying device 84, so that the washing and cooling effects are improved.

In any of the above embodiments, a wire mesh demister 58 is preferably installed in the air outlet 56. The wire mesh demister 58 installed at the outlet can rapidly remove the entrainment entrained in the exhaust gas.

In any of the above schemes, preferably, the upper spraying device 84 includes a plurality of upper fixing seats 59 fixedly installed on the side wall of the inner cavity of the washing tower body 54, the inner end of an upper washing water inlet pipe 60 horizontally arranged extends to the inside of the inner cavity of the washing tower body 54 and is fixed on the corresponding upper fixing seat 59 through a corresponding upper U-shaped clamp 61, the outer end of the upper washing water inlet pipe 60 is provided with an upper washing water inlet 62, and the bottom of the middle section of the upper washing water inlet pipe 7 is provided with a plurality of upper nozzles 63 at intervals.

The upper washing water inlet 62, the lower washing water inlet 67 and the corresponding washing water outlet 72 are respectively matched with the corresponding circulating water pump and the heat exchanger through pipelines.

The upper spraying device 84 receives low-temperature water flow of an external circulating water pump and then enters the upper washing water inlet 62, the low-temperature water flow is continuously sprayed out from the upper nozzle 63 under the action of high pressure of the water flow and is sprayed on the upper packing layer 81 and flows down along the surface of the packing to form a water film on the surface of the packing, the nitrogen and liquid continuously pass through gaps between the packing in a countercurrent mode from bottom to top, and gas-liquid two phases are in close contact on the surface of the packing to conduct heat and mass transfer, so that the nitrogen containing impurities is fully washed and cooled.

In any of the above embodiments, it is preferable that an upper washing water replenishing port 64 is installed on the side wall of the washing tower body 54 below the upper washing water inlet 62. When the upper spray washing water is insufficient, water can be supplemented into the tower through the upper washing water supplementing port 64, and the water supply is sufficient.

It is preferred in any of the above-mentioned schemes that spray set 85 includes a plurality of fixed mounting and is in lower fixing base 65 on the inner chamber lateral wall of washing tower body 54, the lower wash water inlet tube 66's that a level set up inner extends to inside and fix on the lower fixing base 65 that corresponds through the lower part U type clamp 80 that corresponds of inner chamber of washing tower body 54 the outer end of wash water inlet tube 66 is equipped with wash water inlet 67 down the middle section bottom interval of wash water inlet tube 66 is provided with nozzle 68 under a plurality of.

Spray set 85 can get into through washing water import 67 under earlier after receiving outside circulating water pump's rivers down, then because the high pressure effect that rivers exist can be by nozzle 68 duration blowout down, the injection is on lower packing layer 83, and flow down along the packing surface, form the water film on the packing surface, nitrogen gas is the continuous gap between packing in countercurrent with liquid from bottom to top, carry out heat and mass transfer at packing surface gas-liquid two-phase intimate contact, the realization is fully washed the nitrogen gas that contains impurity, the cooling, the washing is sprayed better in the last spray set's of cooperation top effect realization, the effect and the efficiency of washing are improved effectively, can carry out quick washing to a large amount of nitrogen gas.

In any of the above embodiments, it is preferable that a lower washing water replenishing port 69 is installed on the side wall of the washing tower body 54 below the lower washing water inlet 67. When the sprayed washing water is insufficient, the water can be supplemented into the tower through the lower washing water supplementing port 69, so that the water supply is sufficient.

In any of the above embodiments, it is preferable that each of the upper nozzles 63 and each of the lower nozzles 68 employ a conical spiral nozzle. The conical spiral nozzle has the effects of better ensuring the spraying effect and improving the contact sufficiency of the spraying washing water and the nitrogen.

In any of the above schemes, preferably, the bulk material feeding device 86 includes an upper perforated spraying inclined plate 70 obliquely arranged on the side wall of the inner cavity of the washing tower body 54, a liquid level upper meter interface 73, an overflow port 71, a washing water outlet 72, a liquid level lower interface 74 and a sewage outlet 75 are sequentially arranged on the side wall of the washing tower body 54 corresponding to the upper portion of the upper perforated spraying inclined plate 70 from top to bottom, and a plurality of vertically arranged air inlet pipes 76 are arranged above the upper perforated spraying inclined plate 70 along the surface thereof at intervals.

The upper bulk material air inlet device 86 separates upper and lower washing water to prevent upper spraying liquid from entering lower spraying, and gas washed by lower spraying can enter upper spraying through the vertical air inlet pipe 76 of the upper bulk material air inlet device 86.

A certain amount of water is stored at the lower parts of the upper and lower showers, so that impurities in water can naturally settle, a liquid level meter is arranged for detecting the liquid level of the water, water is supplemented through the

water supplementing holes

64 and 69 when the liquid level is low, and redundant water is discharged through the overflow hole 71 when the liquid level is high.

Meanwhile, the level meters connected to the upper level meter interface 73 and the lower level meter interface 74 can effectively observe and measure the current water level state.

The drain outlet 75 can be used for adhering the dirt on the upper porous spraying inclined plate 70 and the lower porous spraying inclined plate 79 to realize outward discharge when the inside of the washing tower body 54 is cleaned after the spraying is finished.

In any of the above schemes, preferably, a conical tube protective cap 77 is fixedly mounted on the top of each air inlet duct 76, and a spacing space 78 is provided between the conical tube protective cap 77 and the top of the corresponding air inlet duct 76.

The conical pipe protective cap 77 can effectively prevent the sprayed liquid from entering the air inlet pipe 76, ensure that the entering nitrogen can be rapidly discharged outwards from the peripheral space, reduce the probability that the upper sprayed liquid enters the lower spraying part, and play the role of air equalization.

In any of the above solutions, preferably, a lower spraying inclined plate 79 is installed in the inner cavity of the washing tower body 54 below the lower spraying device 85, and the intake air enters through an intake port 83 on the side wall of the washing tower.

In any of the above solutions, it is preferable that a filler layer 81 with a certain thickness is fittingly installed in the inner cavity of the washing tower body 1 below the upper spray device 84.

In any of the above schemes, preferably, a filler layer 82 with a certain thickness is fittingly installed in the inner cavity of the washing tower body 1 below the lower spray device 85.

The nitrogen washing is divided into two stages, independent water pumps, heat exchangers and circulating water pipelines are adopted in the two stages, washing water for lower washing is cooled through circulating water, the circulating water used in the two stages can meet the requirements through a water cooling tower, and low-temperature washing water for upper washing is cooled through ice water. The lower washing is used for carrying out primary washing and cooling on the nitrogen, and the upper washing is used for further carrying out washing and cooling on the nitrogen to meet the air outlet requirement of the washing tower. The upper spraying is carried out on the basis of the lower washing and cooling, so that the required cooling capacity is greatly reduced, and the energy consumption for preparing the cooling capacity is greatly reduced.

In any of the above solutions, it is preferable that the feeding system employs a metering and conveying device 10, a feeding port of the metering and conveying device 10 is used for receiving raw materials, and an outlet of the metering and conveying device 10 is used for communicating with an inlet end of the tackifying tower 8.

The metering and conveying device 10 can be an existing product, and the design improvement point of the equipment does not exist, so that the detailed description is omitted.

In any of the above schemes, preferably, the nitrogen circulation system includes a nitrogen preheater 11, a lower inlet of the nitrogen preheater 11 is connected to the top of the tackifying tower 8 and is configured to receive hot nitrogen discharged from the tackifying tower 8, an upper outlet of the nitrogen preheater 11 is connected to an inlet of a nitrogen processing device, an upper inlet of the nitrogen preheater 11 is connected to a top outlet of the nitrogen processing device, a lower outlet of the nitrogen preheater 11 is connected to a multi-stage nitrogen conveying assembly, and the multi-stage nitrogen conveying assembly is configured to convey nitrogen for increasing temperature into the tackifying tower 8 in multiple ways.

In any of the above embodiments, it is preferable that the nitrogen circulation system includes a multi-stage nitrogen gas delivery module, and the multi-stage nitrogen gas delivery module is respectively communicated with the upper part, the middle part and the lower part of the tackifying tower 8.

In any of the above schemes, preferably, the multi-stage nitrogen conveying assembly includes a plurality of sets of one-stage nitrogen conveying branch parts, two-stage nitrogen conveying branch parts, and three-stage nitrogen conveying branch parts, which are arranged in parallel, and the one-stage nitrogen conveying branch parts, the two-stage nitrogen conveying branch parts, and the three-stage nitrogen conveying branch parts are all connected with the lower outlet end of the nitrogen preheater 11 through a header pipe. .

In any of the above schemes, preferably, the primary nitrogen conveying branch component comprises a primary conveying branch pipeline, and a primary nitrogen press 1 and a primary heat exchanger 2 are sequentially installed on the primary conveying branch pipeline in series according to the flowing direction of nitrogen;

in any of the above schemes, preferably, the primary nitrogen conveying branch component includes a secondary conveying branch pipeline, and a secondary nitrogen press 3 and a secondary heat exchanger 4 are sequentially installed in series on the secondary conveying branch pipeline according to the flowing direction of nitrogen;

in any of the above schemes, preferably, the three-stage nitrogen gas delivery branch component includes a three-stage delivery branch pipeline, and a three-stage nitrogen gas compressor 5, a three-stage deaerator 6, and a three-stage heat exchanger 7 are sequentially installed in series on the three-stage delivery branch pipeline according to the flow direction of nitrogen gas.

In any of the above schemes, preferably, the nitrogen circulating system includes a washing tower 13, a top outlet end of the washing tower 13 is connected to an upper inlet end of the nitrogen preheater 11 through an outlet pipeline, a demister unit 12 is installed on the outlet pipeline, a lower inlet end of the washing tower 13 is connected to an upper outlet end of the nitrogen preheater 11 through a pipeline, a circulating pipeline is arranged on one side of the washing tower 13, an inlet end of the circulating pipeline is connected to a bottom outlet end of the washing tower 13, a reflux end of the circulating pipeline is connected to a reflux port on the upper portion of the washing tower 13, and a circulating water pump 14 and a circulating water heat exchanger unit are arranged in the circulating pipeline in series according to a flowing direction of circulating water.

In any of the above schemes, preferably, the demister unit 12 includes two demisters 1201 connected in parallel through a pipeline, and a demisting opening valve 1202 is respectively disposed on a branch pipeline where the two demisters 1201 are located.

The two demisters 1201 can be used for each other, so that the service life and the use effect of the demisters 1201 are greatly prolonged; meanwhile, even if one of the demisting opening valves 1202 fails, the demisting opening valves 1202 on two sides of the demisting opening valve can be independently closed, and then the demisting opening valve is detached for maintenance, so that maintenance is carried out in a state that the whole machine is not shut down, the normal work of the whole system is not influenced while the convenience of maintenance is guaranteed, the sustainability of equipment operation is guaranteed, and the influence of shutdown on yield is reduced.

In any of the above schemes, preferably, the circulating water heat exchanger unit includes two circulating water heat exchangers connected in parallel through a pipeline, and a circulation opening valve 1502 is respectively disposed on a branch pipeline where the two circulating water heat exchangers are located.

The two arranged circulating water heat exchangers can be mutually standby, so that the service life and the use effect of the circulating water heat exchangers are greatly prolonged; meanwhile, even if one of the valves is broken down, the valves 1502 can be opened independently to circulate on two sides of the valve to be closed, and then the valve is detached to be maintained, so that the maintenance is carried out in a state that the whole machine is not shut down, the normal work of the whole system is not influenced while the convenience of maintenance is guaranteed, the sustainability of the operation of equipment is guaranteed, and the influence of shutdown on yield is reduced.

In any of the above schemes, preferably, a high-purity nitrogen gas supplementing port is arranged on a pipeline between the tackifying tower 8 and the demister 1201, and the high-purity nitrogen gas supplementing port can supplement consumed nitrogen gas in time, so that the continuity of the nitrogen gas of the system is effectively ensured.

s1: metering and conveying nylon chip materials and enabling the materials to enter a tackifying tower 8 of a nylon chip continuous solid-phase tackifying system;

s2: the nylon chips flow in a plug flow manner from top to bottom in the tackifying tower 8;

s3: introducing nitrogen into the tackifying tower 8 and fully contacting the nylon chips;

The specific steps of introducing nitrogen in the S3 are as follows: the nitrogen is divided into three strands and respectively enters the interior of the tackifying tower 8 from the upper part, the middle part and the lower part of the tackifying tower 8, and each nitrogen pipeline is provided with an independent nitrogen press and a nitrogen heat exchanger for accurately controlling the flow and the temperature of each strand of nitrogen to realize the accurate control of the temperature of the section in the tackifying tower 8. At least one of the two paths can be provided with a deaerator 6, and the deaerator 6 can deaerate nitrogen to ensure the purity of the nitrogen.

The nylon particles flow from top to bottom in a plug flow mode through the distribution of the internal parts in the tackifying tower 8, so that the residence time of the nylon chips in the tackifying tower 8 is consistent, the tackifying uniformity of the nylon chips is finally ensured, and the adhesion caused by the non-flowing of local materials is prevented.

The nylon slices are heated by three strands of nitrogen at the upper, middle and lower parts in the tackifying tower 8, the temperature of the upper slices is controlled to be 80-150 ℃, the temperature of the middle slices is controlled to be 140-170 ℃, and the temperature of the lower slices is controlled to be 160-180 ℃.

The system adopts a nitrogen closed cycle, hot nitrogen is discharged from the top of the tackifying tower 8, enters the nitrogen preheater 11 to exchange heat with cold nitrogen from the demister 1201, enters the washing tower 13 from the lower part of the washing tower 13, and is washed and cooled by the washing tower 13 to remove carried by-products, namely small molecules and moisture in the tackifying process.

The washed nitrogen enters a demister 1201 for demisting and drying, enters a nitrogen preheater 11 for preheating, and then enters a tackifying tower 8 in three strands.

The hot nitrogen entering the upper part of the tackifying tower 8 is a part of the nitrogen which is preheated by the washing demisting and nitrogen preheater 11, and the nitrogen enters the tackifying tower 8 from the upper part after being pressurized by the primary nitrogen compressor 1 and heated by the primary nitrogen heat exchanger.

The hot nitrogen entering the middle part of the tackifying tower 8 is a part after washing, demisting and preheating by the nitrogen preheater 11, and the nitrogen enters the tackifying tower 8 from the middle part after being pressurized by the secondary nitrogen press 3 and heated by the secondary nitrogen heat exchanger.

The hot nitrogen entering the lower part of the tackifying tower 8 is a part after washing, demisting and preheating by the nitrogen preheater 11, and the nitrogen enters the tackifying tower 8 from the lower part after being pressurized by the three-stage nitrogen press 5, deoxygenated by the three-stage deoxygenator 6 and heated by the three-stage nitrogen heat exchanger.

S4: keeping the steps from S2 to S3, and enabling the nylon chips to stay in a tackifying tower 8 for 12-36 hours to finish the tackifying process;

s5: after the tackifying process is finished, the nylon slices tackified by the tackifying tower 8 enter a cooling tower 9 for cooling;

s6: continuously cooling under the cooling action of a circulating water cooler of the cooling tower 9, and conveying the qualified product into a finished product bin through pneumatic transmission.

In any of the above schemes, preferably, the temperature of the slices at the upper part in the tackifying tower 8 is controlled to be 80-150 ℃, the temperature of the slices at the middle part is controlled to be 140-170 ℃, and the temperature of the slices at the lower part is controlled to be 160-180 ℃.

The specific working principle is as follows:

the system takes a conventional nylon 66 slice as an example:

1) the grain diameter of the conventional nylon 66 slices is phi 2.5 x 3.0mm, the water content is 400ppm, the slice temperature is 30 ℃, the relative viscosity is 2.6, and the nylon slices enter a tackifying tower 8 through a metering and conveying device 10.

2) The nylon chips flow in a plug flow mode from top to bottom in the tackifying tower 8, and meanwhile, nitrogen is reversely introduced and fully contacts with the nylon chips, and the nitrogen takes away small molecules (water) which are byproducts in the tackifying process.

3) The nylon slices are heated by three strands of nitrogen in a tackifying tower 8, the temperature of the upper slices is controlled at 140 ℃, the temperature of the middle slices is controlled at 175 ℃, and the temperature of the lower slices is controlled at 180 ℃. .

4) The nylon chips remained in the thickening column 8 for 24 hours and the chip viscosity increased to 3.2.

5) The nylon slices enter a cooling tower 9 after being tackified by a tackification tower 8, the temperature of the slices in the cooling tower 9 is cooled to 40 ℃ by circulating water cooling, and the slices are conveyed into a finished product bin through pneumatic conveying

6) Hot nitrogen is discharged from the top of the tackifying tower 8, enters the nitrogen preheater 11 to exchange heat with cold nitrogen from the demister 1201, enters the washing tower 13 from the lower part of the washing tower 13, and is washed and cooled by the washing tower 13 to remove carried by-product micromolecules and moisture in the tackifying process.

9) The washed nitrogen enters a demister 1201 for demisting and drying, enters a nitrogen preheater 11 for preheating, and then enters a tackifying tower 8 by dividing three strands at the upper, middle and lower parts. A deaerator 6 is arranged in nitrogen at the lower part of the tackifying tower 8, and the oxygen content in the nitrogen is controlled to be below 10ppm after the nitrogen is deaerated by the deaerator 6, so that the nylon chips are prevented from being oxidized in the tackifying process.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention, and the technical solutions are all covered in the scope of the claims and the specification of the present invention; it will be apparent to those skilled in the art that any alternative modifications or variations to the embodiments of the present invention may be made within the scope of the present invention.

The present invention is not described in detail, but is known to those skilled in the art.

Claims

1. Continuous solid phase tackification system of nylon chip, its characterized in that: the device comprises a feeding system, a tackifying tower, a nitrogen circulating system and a cooling tower, wherein the downstream of the feeding system is connected with the tackifying tower, the nitrogen circulating system is connected with the inside of the tackifying tower and used for conveying nitrogen for the inside of the tackifying tower, the tackifying tower is used for realizing continuous tackifying treatment on nylon slices entering the tackifying tower, and the cooling tower is connected and arranged at the downstream of the tackifying tower and used for cooling the nylon slices subjected to tackifying treatment.

2. The continuous solid phase tackifying system for nylon chips of claim 1, wherein: the feeding system adopts a metering conveying device, a feed inlet of the metering conveying device is used for receiving raw materials, and an outlet of the metering conveying device is used for being communicated with an inlet end of the tackifying tower.

3. The continuous solid phase tackifying system for nylon chips of claim 2, wherein: the nitrogen circulating system comprises a nitrogen preheater, the lower inlet end of the nitrogen preheater is connected with the top of the tackifying tower and used for receiving hot nitrogen discharged from the tackifying tower, the upper outlet end of the nitrogen preheater is connected with the inlet end of a nitrogen processing device, the upper inlet end of the nitrogen preheater is connected with the top outlet end of the nitrogen processing device, the lower outlet end of the nitrogen preheater is connected with a multi-stage nitrogen conveying assembly, and the multi-stage nitrogen conveying assembly is used for conveying nitrogen which is increased in temperature in the tackifying tower in a multi-path mode.

4. The continuous solid phase tackifying system for nylon chips of claim 3, wherein: the nitrogen circulating system comprises a multi-stage nitrogen conveying assembly, and the multi-stage nitrogen conveying assembly is respectively communicated with the upper part, the middle part and the lower part of the tackifying tower.

5. The continuous solid phase tackifying system for nylon chips of claim 4, wherein: the multistage nitrogen conveying assembly comprises a plurality of groups of one-stage nitrogen conveying branch parts, two-stage nitrogen conveying branch parts and three-stage nitrogen conveying branch parts, wherein the one-stage nitrogen conveying branch parts, the two-stage nitrogen conveying branch parts and the three-stage nitrogen conveying branch parts are arranged in parallel, and are connected with the lower outlet end of the nitrogen preheater through a header pipe.

6. The continuous solid phase tackifying system for nylon chips of claim 5, wherein: the primary nitrogen conveying branch component comprises a primary conveying branch pipeline, and a primary nitrogen press and a primary heat exchanger are sequentially installed on the primary conveying branch pipeline in series according to the flowing direction of nitrogen;

the secondary nitrogen conveying branch component comprises a secondary conveying branch pipeline, and a secondary nitrogen press and a secondary heat exchanger are sequentially installed on the secondary conveying branch pipeline in series according to the flowing direction of nitrogen;

the three-level nitrogen conveying branch component comprises a three-level conveying branch pipeline, wherein a three-level nitrogen press, a deaerator and a three-level heat exchanger are sequentially installed on the three-level conveying branch pipeline in series according to the flowing direction of nitrogen.

7. The continuous solid phase tackifying system for nylon chips of claim 6, wherein: nitrogen gas circulation system includes the scrubbing tower, the top outlet end of scrubbing tower pass through outlet pipe with the upper portion entrance point of nitrogen gas pre-heater links to each other, installs the defroster unit on outlet pipe way, the lower part entrance point of scrubbing tower pass through the pipeline with the upper portion exit end of nitrogen gas pre-heater links to each other one side of scrubbing tower is equipped with a circulation line, circulation line's entrance point with the bottom exit end of scrubbing tower links to each other, circulation line's return port the backward flow mouth on the upper portion of scrubbing tower links to each other circulation line is provided with circulating water pump, circulating water heat exchanger unit according to the flow direction series connection of circulating water.

8. The continuous solid-phase tackifying treatment method of the nylon slices is characterized by comprising the following steps: the method comprises the following steps:

9. The continuous solid-phase tackifying treatment method of nylon chips of claim 8, characterized in that: the nylon chip continuous solid-phase tackifying system described in S1 is the nylon chip continuous solid-phase tackifying system described in any one of claims 1 to 7.

10. The continuous solid-phase tackifying treatment method of nylon chips of claim 9, characterized in that: the temperature of slices at the upper part in the tackifying tower is controlled to be 80-150 ℃, the temperature of slices at the middle part is controlled to be 140-170 ℃, and the temperature of slices at the lower part is controlled to be 160-180 ℃.