CN216499254U - Solid-phase tackifying reactor and system of integrated bi-component nylon - Google Patents

Abstract

The utility model discloses an integrated double-component nylon solid-phase tackifying reactor and a system thereof; the solid-phase tackifying reactor of the integrated bi-component nylon is characterized in that a preheating section, a reaction section and a cooling section are connected into a whole, and slices filled in the preheating section and the reaction section directly fall into the cooling section by self weight. After slices are uniformly heated and stayed by circularly heating nitrogen in the preheating and reaction section, the slices enter a cooling section at the lower part of the reactor; the slices entering the cooling section are cooled by the circulating nitrogen of the cooling section, and the slices are conveyed to a finished product bin through a conveying system. The equipment investment and the building investment are greatly saved, and the viscosity rise value (sulfuric acid method) of the raw material slices and the finished product slices can reach 1.8 at most. The method is used for producing high-quality high-viscosity bi-component nylon chips, the highest viscosity of the product can reach more than 3.45, and the water content is within the range of 0.02-0.06%.

Description

Solid-phase tackifying reactor and system of integrated bi-component nylon

Technical Field

The utility model belongs to the technical field of production processes of bi-component high-viscosity nylon chips, and particularly relates to an integrated bi-component nylon solid-phase tackifying reactor and an integrated bi-component nylon solid-phase tackifying system.

Background

Due to the limitation of nylon polymerization technology, the slice viscosity (sulfuric acid process) produced by a conventional nylon polymerization device is within the range of 2.4-2.8, the slice viscosity produced by a nylon polymerization production line with double components and high viscosity is within the range of 3.2-3.5, and the quality of the high-viscosity slice produced by a melt polymerization mode is reduced. The solid-phase tackifying technology is an important production mode for obtaining high-quality high-viscosity slices. The solid-phase polymerization device for preparing the high-viscosity bi-component nylon chips usually adopts a drum batch polymerization or a continuous solid-phase polymerization mode of a dryer, a solid-phase polymerization reactor and a cooler. The drum intermittent polymerization production operation is troublesome, and the product quality batch difference is large; the polycondensation mode equipment of the dryer, the solid-phase polymerization reactor and the cooler are connected by a pipeline, and the blanking speed is controlled by a rotary blanking device. The whole height of the device is high, the occupied space of the device is large, the device cost and the raw material conveying cost are high, the rotary blanking device can generate extra broken foam and dust, and the product quality is influenced, for example, the technologies adopted in the patents 21010532870.5, 2012104777335, 2014103949507 and 201610741833.2 have the defects.

SUMMERY OF THE UTILITY MODEL

The utility model designs an integrated double-component nylon solid-phase tackifying reactor and a system thereof, which effectively solve the problems listed in the background technology.

The solid-phase tackifying reactor of the integrated bi-component nylon has the following structure: the reactor consists of an upper preheating section cylinder, a middle reaction section cylinder, a lower cooling section cylinder, a feed inlet, a preheating section air outlet, an inner preheating section cone, an outer preheating section cone, a preheating section air inlet ring, a preheating section air inlet, a preheating section distribution cone, an inner reaction section cone, a reaction section air inlet, a reaction section distribution cone, a cooling section air return cavity, a cooling section air outlet, a cooling section cone, a cooling section air inlet, a cooling section distribution cone, a discharge outlet and a reactor heat-insulating coil, and the connection relationship is as follows:

the top of the preheating section cylinder is closed, the preheating section cylinder is provided with a feed inlet and a preheating section air outlet, and the bottom of the preheating section cylinder is provided with an inner preheating section cone and an outer preheating section cone which are annular and downward-opening type inverted cones; an annular conical cavity between the two preheating section cones forms a preheating section air inlet ring, and a preheating section air inlet is formed in the outer preheating section cone corresponding to the preheating section air inlet ring; a preheating section distribution cone is arranged inside the preheating section cylinder body and above the preheating section air inlet ring;

the upper part of the reaction section cylinder body is open, the reaction section cylinder body is sleeved on the outer preheating section cone through the opening, and the bottom of the reaction section cylinder body is provided with the reaction section cone which is annular and is in an inverted cone shape with a downward opening; a reaction section air inlet is formed in the reaction section cone; a reaction section distribution cone is arranged inside the reaction section cylinder body and above the reaction section air inlet;

the upper part of the cooling section cylinder is open, the cooling section cylinder is sleeved on the reaction section cone through the opening, and a cavity formed between the cooling section cylinder and the reaction section cone is a cooling section air return cavity; communicating the interior of the reaction section cylinder body and the interior of the cooling section cylinder body through the opening of the reaction section cone body; the outer wall of the cooling section air return cavity is provided with a cooling section air outlet for discharging;

the lower structure of the cooling section cylinder is the same as that of the reaction section cylinder; the bottom of the cooling section cylinder is provided with a cooling section cone; the cooling section cone is in a closed type inverted cone shape; a cooling section air inlet is formed in the cooling section cone; a cooling section distribution cone is arranged in the cooling section cylinder above the cooling section air inlet; and a discharge hole is formed in the bottom of the outer layer cooling section cone.

The reactor heat-preservation coil is of a circular tube structure, is uniformly wound and fixed on the outer walls of the cylinder body of the preheating section and the reaction section, is provided with a plurality of sections of inlets and outlets according to the length requirement, and adopts steam or heat-conducting oil as a heat-preservation filling medium in the reactor heat-preservation coil; the process temperature setting of the reactor heat-insulating coil pipe is consistent with the process temperature in the reaction section cylinder.

For the above technical solution, further, the preheating section distribution cone, the reaction section distribution cone and the cooling section distribution cone are all right triangular cones with upward cone tops, and the cone angle is 30 ° to 60 ° (generally 45 ° or 60 °).

For the technical scheme, the diameter of the preheating section cylinder is 1-1.2 times of that of the reaction section cylinder, and the diameter of the cooling section cylinder is 0.6-1 times of that of the reaction section cylinder.

For the technical scheme, the diameter of the opening of the cone of the inner preheating section is 0.3-0.8 times of the diameter of the cylinder of the preheating section; the diameter of the opening of the cone of the reaction section is 0.3-0.8 times of the diameter of the cylinder of the reaction section; the opening diameter is related to the residence time for which the apparatus is designed, and generally the longer the residence time, the larger the value.

For the technical scheme, the diameter of the bottom surface of the distribution cone of the preheating section is 0.5-1.2 times of the diameter of the opening of the air inlet ring of the preheating section, and the height of the bottom surface of the distribution cone from the barrel body of the reaction section is about 0.2-0.5 times of the diameter of the bottom surface of the distribution cone; the height of the preheating section from the opening of the air inlet ring is about 0.2 to 1.5 times of the diameter of the opening.

For the technical scheme, the diameter of the bottom surface of the distribution cone of the reaction section is 0.5-0.7 times of the diameter of the reaction section, the value is determined according to the height of a material layer of the designed reaction section, the higher the height is, the larger the value is, the height of the bottom surface of the distribution cone from the barrel body of the reaction section is about 0.2-0.5 times of the diameter of the bottom surface of the distribution cone, and the height of the bottom surface of the distribution cone from the air inlet of the reaction section is about 0.2-1.5 times of the diameter of the opening.

For the technical scheme, further, the diameter of the bottom surface of the cooling section distribution cone is 0.5-0.7 times of the diameter of the cooling section, and the height of the bottom surface of the cooling section distribution cone from the position of the cooling section air inlet is about 0.2-1.5 times of the diameter of the opening.

The system for producing the bi-component high-viscosity nylon slices by using the solid-phase tackifying reactor of the integrated bi-component nylon comprises the solid-phase tackifying reactor of the integrated bi-component nylon, a first fan, a first nitrogen heater, an energy-saving heat exchanger, a nitrogen cooler I, a spray cooling tower, a spray water pump, a second fan, a deaerator, a second nitrogen heater, a cooling fan and a nitrogen cooler II; the connection relationship is as follows:

the system is also provided with a nitrogen replacement bin, a feeder and a discharger which are matched for use. Specifically, raw material low-viscosity bi-component nylon chips of an upstream process fall into an integrated bi-component nylon solid-phase tackifying reactor through a nitrogen displacement bin, a feeder and a feed inlet; and then is conveyed out through a discharging device.

An air outlet at the top of the preheating section of the solid-phase tackifying reactor of the integrated bi-component nylon is respectively connected with an inlet of a first fan and an inlet of an energy-saving heat exchanger, and an air outlet of the first fan is connected with an air inlet of the preheating section through a first nitrogen heater; the outlet of the energy-saving heat exchanger is sequentially connected with the nitrogen cooler I and the spray cooling tower, the spray cooling tower is connected with a second fan, and the air outlet of the second fan is sequentially connected with the energy-saving heat exchanger, the deaerator and the second nitrogen heater and then connected with the air inlet of the reaction section of the solid-phase tackifying reactor of the integrated bi-component nylon;

the spray cooling tower is provided with a spray water pump as water circulation power;

and a three-way pipeline is arranged on a pipeline between the deaerator and the second nitrogen heater, the pipeline is connected with an air outlet of the cooling section, and the pipeline is connected with a cooling fan and a nitrogen cooler II and then is connected with an air inlet of the cooling section of the solid-phase tackifying reactor of the integrated double-component nylon. That is to say, the air outlet of the cooling section of the solid-phase tackifying reactor of the integrated bi-component nylon is sequentially connected with the cooling fan, the nitrogen cooler II and the air inlet of the cooling section of the solid-phase tackifying reactor of the integrated bi-component nylon.

The solid-phase tackifying reactor of the integrated bi-component nylon is utilized to produce the high-viscosity nylon chip by the following process flow:

the low-viscosity bi-component nylon chips enter the solid-phase tackifying reactor of the integrated bi-component nylon from the nitrogen replacement bin through the feeder and the feed inlet, are filled into a preheating section and a reaction section barrel at the upper part of the solid-phase tackifying reactor of the integrated bi-component nylon through the feeder and the feed inlet, and the material accumulated in the reactor is controlled by the discharger to gradually fall; the low-viscosity nylon chips are fully contacted with high-temperature reaction nitrogen in the reaction section cylinder body at the upper preheating section, heated to 130-180 ℃ and fall into the reaction section for reaction and viscosity increasing; after staying in the reaction section cylinder for 30 hours, the low-viscosity nylon chips fall into the cooling section cylinder through the reaction section distribution cone mouth; the slices which are already reacted and tackified in the reaction section cylinder body enter the cooling section cylinder body, are cooled to below 38 ℃ by circulating cold nitrogen, and are finally sent to a finished product packaging section through a discharge hole and a discharge device arranged at the bottom of the outer layer cooling section cone.

For the technical solution mentioned above, further, in the process of viscosity increasing by reaction of the low-viscosity bicomponent nylon chip through the reaction section cylinder, the utilization of the reaction cycle nitrogen is involved, and the utilization process of the reaction cycle nitrogen is as follows:

the reaction nitrogen coming out of the air outlet at the top of the cylinder body at the preheating section is divided into two parts, and one part of the reaction nitrogen is pressurized by a first fan and then is used as direct circulating nitrogen to be heated by a nitrogen heater and directly enters the air inlet at the preheating section; the other part of the nitrogen enters a spray cooling tower for cooling after being preliminarily cooled by an energy-saving heat exchanger and a nitrogen cooler, is sprayed and cooled to 12-25 ℃, is subjected to removal of redundant moisture to obtain dehumidified nitrogen, and then enters an integrated double-component nylon solid-phase tackifying reactor through a second fan, the energy-saving heat exchanger, a deaerator and a second nitrogen heater through a reaction section air inlet in sequence to perform solid-phase polycondensation reaction and recycle;

and after being cooled and pressurized by a cooling fan and a nitrogen cooler, nitrogen from the cooling section enters a cooling section cylinder of the integrated double-component nylon solid-phase tackifying reactor again through a cooling section air inlet to circulate, and the ratio of the flow of cooling circulating nitrogen to the flow of the slices is generally controlled to be 1.2-2.5.

For the above technical solution, further, in order to ensure that the heating or cooling of the slices by the nitrogen is more sufficient and uniform, the ratio of the flow rate of the circulating nitrogen used in the preheating section to the flow rate of the slices is generally controlled to be 3.5 to 6.5, and the ratio of the flow rate of the circulating nitrogen used in the reaction section to the flow rate of the slices is generally controlled to be 1.5 to 3.0. The lower the throughput, the higher the value, and the higher the value required for the viscosity, for the same plant.

For the technical scheme, further, in the reaction circulating nitrogen, the ratio of the nitrogen dehumidified by the spray cooling tower to the flow rate of the slices is generally controlled to be 1.5-3.0; by controlling the proportion, the humidity of nitrogen in the process that the slices are subjected to reaction and tackifying by the reaction section cylinder can be further controlled, so that the final water content of the finished slices can be adjusted within the range of 0.02-0.06%. Therefore, compared with the traditional whole cooling and dehumidifying process, the method has obvious energy-saving effect by adopting part of the circulating nitrogen for cooling and dehumidifying.

For the technical scheme, further, nitrogen coming out of the cooling section is cooled and pressurized by the cooling fan and the nitrogen cooler, and then enters the cooling section cylinder of the integrated double-component nylon solid-phase tackifying reactor through the cooling section air inlet to be circulated, and the ratio of the flow rate of cooling circulating nitrogen to the flow rate of slices is generally controlled to be 1.2-2.5. The cooling circulation achieves the dual functions of cooling and humidifying by quantitatively supplementing and replacing the high dew point nitrogen processed by the spraying system.

Compared with a split device of a drying preheater, a reactor and a cooler with the same scale, the integrated solid-phase tackifying reactor for bi-component nylon and the method for producing bi-component high-viscosity nylon slices are used for producing high-quality high-viscosity nylon slices, the integrated solid-phase tackifying reactor for bi-component nylon at least saves 8m of space on the height of equipment, can reduce the energy consumption of raw material conveying by about 0.8kw, and saves the cost by about 6000 yuan per year; the rotary blanking device among the drying preheater, the reactor and the cooler is reduced, and the overall breakage rate of the finished product slices can be reduced by about 30 ppm. In addition, the equipment investment and the building investment are greatly saved. The viscosity rise value (sulfuric acid method) of the raw material slices and the finished product slices can reach 1.8 at most. The highest viscosity of the product can reach more than 3.5, and the water content is within the range of 0.02-0.06%.

Drawings

FIG. 1: the structure of the solid-phase tackifying reactor of the integrated bi-component nylon is shown schematically;

FIG. 2: a process flow schematic for producing bi-component high viscosity nylon chips using the solid phase tackifying reactor for the unitary bi-component nylon described above;

wherein: 1. the system comprises a preheating section cylinder, 2 reaction section cylinders, 3 cooling section cylinders, 4 feed inlets, 5 preheating section air outlets, 6 inner preheating section cones, 7 outer preheating section cones, 8 preheating section air inlet rings, 9 preheating section distribution cones, 10 preheating section air inlets, 11 reactor heat-preservation coil pipes, 12 inner reaction section cones, 13 reaction section distribution cones, 14 reaction section air inlets, 15 cooling section air return cavities, 16 cooling section air outlets, 17 cooling section distribution cones, 18 cooling section air inlets, 19 cooling section cones, 20 discharge ports, 21 nitrogen replacement bins, 22 feeders, 23 discharge devices, 24 first fans, 25 first nitrogen heaters, 26 energy-saving heat exchangers, 27 nitrogen coolers I, 28 spray cooling towers, 29 second fans, 30 deaerators, 31 second nitrogen heaters, 31 spray cooling towers, 29 second fans, 30 deaerators, 31 second nitrogen heaters, a first fan, a second fan, a third fan, a fourth, 32. Cooling fan, 33, nitrogen gas cooler II, 34, spray water pump.

Detailed Description

The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the utility model in any way.

Example 1 solid phase tackifying reactor architecture for one-piece bicomponent nylon

The solid-phase tackifying reactor of the integrated bi-component nylon has the following structure: the device consists of an upper preheating section cylinder 1, a middle reaction section cylinder 2 and a lower cooling section cylinder 3, and the structure of the device consists of a feed inlet 4, a preheating section air outlet 5, an inner preheating section cone 6, an outer preheating section cone 7, a preheating section air inlet ring 8, a preheating section distribution cone 9, a preheating section air inlet 10, a reactor heat-insulating coil 11, an inner reaction section cone 12, a reaction section distribution cone 13, a reaction section air inlet 14, a cooling section air return cavity 15, a cooling section air outlet 16, a cooling section distribution cone 17, a cooling section air inlet 18, a cooling section cone 19, a discharge outlet 20 and the reactor heat-insulating coil 11; the specific connection relation is as follows:

the top of the preheating section cylinder body 1 is closed, and is provided with a feed inlet 4 and a preheating section air outlet 5, and the bottom of the preheating section cylinder body is provided with an inner preheating section cone 6 and an outer preheating section cone 7 which are both annular and downward opening type inverted cones; an annular conical cavity between the two preheating section cones forms a preheating section air inlet ring 8, and a preheating section air inlet 10 is arranged on an outer layer preheating section cone 7 corresponding to the preheating section air inlet ring 8; a preheating section distribution cone 9 is arranged inside the preheating section cylinder body and above the preheating section air inlet ring 8;

the upper part of the reaction section cylinder body 2 is open, the reaction section cylinder body 2 is sleeved on the outer preheating section cone 7 through the opening, and the bottom of the reaction section cylinder body 2 is provided with a reaction section cone 12 which is annular and is in a downward opening type inverted cone shape; a reaction section air inlet 14 is formed in the reaction section cone 12; a reaction section distribution cone 13 is arranged in the reaction section cylinder 2 above the reaction section air inlet 14;

the upper part of the cooling section cylinder 3 is open, the cooling section cylinder 3 is sleeved on the reaction section cone 12 through the opening, and a cavity formed between the cooling section cylinder 3 and the reaction section cone 12 is a cooling section return air cavity 15; the reaction section cylinder 2 is communicated with the inside of the cooling section cylinder 3 through an opening of the reaction section cone 12; and a cooling section air outlet 16 is arranged on the outer wall of the cooling section air return cavity 15.

The structure of the lower part of the cooling section cylinder 3 is similar to that of the reaction section cylinder 2; the bottom of the cooling section cylinder 3 is provided with a cooling section cone 19 in a closed inverted cone shape; a cooling section air inlet 18 is arranged on the cooling section cone 19; a cooling section distribution cone 17 is arranged in the cooling section cylinder 3 above the cooling section air inlet 18; the bottom of the cooling section cone 19 is provided with a discharge hole 20.

The reactor heat-insulating coil pipe 11 is a circular pipe structure which is uniformly wound and fixed on the outer walls of the preheating section cylinder 1 and the reaction section cylinder 2, and can be provided with a plurality of sections of inlets and outlets according to the length requirement, and steam or heat-conducting oil is adopted in the reactor heat-insulating coil pipe 11 as a heat-insulating filling medium.

The preheating section distribution cone 9, the reaction section distribution cone 13 and the cooling section distribution cone 17 are all right triangular cones with upward conical tops, and the conical angle is 60 degrees.

The diameter of the preheating section cylinder 1 is 1.1 times of that of the reaction section cylinder 2; the diameter of the cooling section cylinder 3 is 0.8 times of that of the reaction section cylinder 2;

the diameter of the opening of the cone 6 of the preheating section of the inner layer is 0.7 times of the diameter of the cylinder 1 of the preheating section; the opening diameter of the reaction section cone 12 is 0.7 times of the diameter of the reaction section cylinder 2;

the diameter of the bottom surface of the distribution cone 9 of the preheating section is 0.5 times of the diameter of the opening of the air inlet ring 8 of the preheating section, and the height from the bottom surface of the distribution cone to the opening of the air inlet ring 8 of the preheating section is 0.6 times of the diameter of the opening.

The diameter of the bottom surface of the reaction section cone 13 is 0.5 times of the diameter of the opening of the reaction section cone 12, and the height from the opening of the reaction section cone 12 is 0.6 times of the diameter of the opening.

The diameter of the bottom surface of the cooling section distribution cone 17 is 0.6 times of the diameter of the cooling section cylinder 3, and the height from the cooling section air inlet 18 is about 0.4 times of the diameter of the cooling section cylinder.

Example 2 System for producing high viscosity Nylon chips Using solid phase tackification reactor of Integrated Bi-component Nylon

The system for producing the high-viscosity bi-component nylon slices by utilizing the solid-phase tackifying reactor of the integrated bi-component nylon mainly comprises a nitrogen displacement bin 21, a feeder 22, a discharger 23, a first fan 24, a first nitrogen heater 25, an energy-saving heat exchanger 26, a nitrogen cooler I27, a spray cooling tower 28, a second fan 29, a deaerator 30, a second nitrogen heater 31, a cooling fan 32, a nitrogen cooler II33, a spray water pump 34 and other equipment; the specific connection relationship is as follows:

the solid-phase tackifying reactor of the integrated bi-component nylon is connected with a nitrogen replacement bin 21 through a feeder 22 and a feed inlet 4;

the preheating section air outlet 5 at the top of the preheating section of the solid-phase tackifying reactor of the integrated bi-component nylon is respectively connected with an inlet of a first fan 24 and an inlet of an energy-saving heat exchanger 26, the air outlet of the first fan 24 is connected with an air inlet 10 of the preheating section through a nitrogen heater 25, an outlet of the energy-saving heat exchanger 26 is connected with an inlet of a nitrogen cooler I27, an outlet of the nitrogen cooler I27 is connected with an inlet of a spray cooling tower 28, an outlet of the spray cooling tower 28 is connected with an inlet of a second fan 29, and an air outlet of the second fan 29 is sequentially connected with the energy-saving heat exchanger 26, a deaerator 30, a nitrogen heater 31 and a reaction section air inlet 14 of the solid-phase tackifying reactor of the integrated bi-component nylon.

A communication pipeline is arranged between the outlet pipeline of the deaerator 30 and the inlet pipeline of the cooling fan 32.

The cooling section air outlet 16 of the solid-phase tackifying reactor of the integrated bi-component nylon is sequentially connected with a cooling fan 32 and a nitrogen cooler II33, and finally connected with the solid-phase tackifying reactor of the integrated bi-component nylon through a cooling section air inlet 18.

Example 3 Process flow for producing high viscosity nylon chips using the solid phase tackification reactor for one-piece bicomponent nylon described above

The low-viscosity nylon chips enter the solid-phase tackifying reactor of the integrated bi-component nylon through a nitrogen replacement bin 21, are filled into a preheating section barrel 1 at the upper part of the solid-phase tackifying reactor of the integrated bi-component nylon through a feeder 22 and a feed inlet 4, and the material accumulated in the reactor is controlled by a discharge device 22 to gradually fall; the low-viscosity nylon chips are fully contacted with high-temperature reaction nitrogen in the upper preheating section cylinder 1, heated to 130-180 ℃, and begin to react and tackify; the nylon chips with low viscosity stay in the reaction section cylinder 2 for 30 hours and then fall into the cooling section cylinder 3 through the reaction section distribution cone 13; under the action of the reaction section distribution cone 13, the slices can fall uniformly in a plug flow state, and the contact between nitrogen and the slices can be more uniform and sufficient; the distribution cone 13 can also effectively prevent the slices from arching and blocking. The slices which are reacted and tackified in the reaction section cylinder 2 enter the cooling section cylinder 3, are cooled to below 38 ℃ by circulating cold nitrogen, and finally are sent to a storage packaging section through a discharge port 20 and a discharge device 23 arranged at the bottom of a cooling section cone 19.

The process of viscosity increase by reaction of the low-viscosity nylon chip relates to the utilization of reaction circulating nitrogen, and the process of the reaction circulating nitrogen utilization is as follows:

reaction nitrogen coming out of a preheating section air outlet 5 at the top of the preheating section cylinder body is divided into two parts, one part of the reaction nitrogen is pressurized by a first fan 24 and then directly enters an upper preheating section cylinder body 1 through a preheating section air inlet 10 as direct circulation nitrogen via a nitrogen heater 25, the other part of the reaction nitrogen is subjected to preliminary temperature reduction by an energy-saving heat exchanger 26 and a nitrogen cooler I27 and then enters a spray cooling tower 28 for cooling and spray cooling to 12-25 ℃, redundant moisture is removed to obtain dehumidification nitrogen, and the dehumidification nitrogen is pressurized by a second fan 29 and then sequentially passes through the energy-saving heat exchanger 26, a deaerator 30 and a nitrogen heater 31 and then enters an integrated double-component nylon solid-phase tackifying reactor through a reaction section air inlet 14 to perform solid-phase polycondensation and recycling.

In order to ensure that the heating or cooling of the slices by the nitrogen is more sufficient and uniform, the ratio of the flow of the circulating nitrogen in the preheating section to the flow of the slices is generally controlled to be 3.5-6.5.

In order to ensure that the heating or cooling of the slices by the nitrogen is more sufficient and uniform, the ratio of the flow of the circulating nitrogen used in the reaction section to the flow of the slices is generally controlled to be 1.5-3.0.

In the reaction circulating nitrogen, the ratio of the nitrogen dehumidified by the spray cooling tower 28 to the slice flow is 1.5-3.0; by controlling the proportion, the humidity of nitrogen in the process that the slices are reacted and tackified by the reaction section cylinder 2 can be further controlled, so that the water content of finished slices out of the reaction section is adjusted within the range of 0.02-0.06%.

And after being cooled and pressurized by the cooling fan 32 and the nitrogen cooler II33, nitrogen coming out of the cooling section cylinder enters the cooling section cylinder of the integrated double-component nylon solid-phase tackifying reactor again through the cooling section air inlet 18 for circulation, wherein the ratio of the flow rate of cooling circulating nitrogen to the flow rate of the slices is generally controlled to be 1.2-2.5. The circulation adjusts the slice humidity by supplementing the high dew point nitrogen after the oxygen removal by spraying, thereby realizing the adjustment of the final water content of the finished product slices within the range of 0.02-0.06%.

Take a device for producing 5000 tons of high-viscosity bi-component nylon slices per year as an example:

conveying the bi-component nylon chips with the water content of about 0.7% and the viscosity of 2.61 to a nitrogen replacement bin 21 by airflow for nitrogen replacement, entering an integrated bi-component nylon solid-phase tackifying reactor under the action of a feeder 22, filling the bi-component nylon chips into an upper preheating section cylinder 1, and keeping a certain material level; in the preheating section cylinder 1, the slices are fully contacted with high-temperature reaction nitrogen at 170 ℃ from the preheating section air inlet 10, the temperature of the slices is raised, water is removed, and meanwhile, polycondensation reaction is initiated and then the slices enter the reaction section cylinder 2; the slices are continuously subjected to polycondensation reaction in the reaction section under the action of fresh nitrogen at the bottom, and the molecular weight and the viscosity are correspondingly increased; the tackified slices directly fall into a cooling section cylinder 3 at the bottom of a solid-phase tackification reactor of the integrated bi-component nylon, fresh nitrogen slices with certain humidity are humidified to about 500ppm in the cooling section cylinder 3 and cooled to below 38 ℃ by circulating cold nitrogen, and the slices are finally sent to a finished product storage or packaging section through a discharging device 23.

The water removed by the tackifying reaction is taken out from an air outlet 5 of the preheating section at the top by circulating nitrogen and divided into two paths, one path is pressurized by a first fan 24 and heated to 170 ℃ by a nitrogen heater 25, and then directly enters an air inlet 10 of the preheating section for circulating preheating; the other path is used as dehumidifying nitrogen, is subjected to primary temperature reduction through an energy-saving heat exchanger 26 and a nitrogen cooler I27, then enters a spray cooling tower 28 to be cooled to 20 ℃ below zero, is subjected to removal of redundant moisture, then enters the energy-saving heat exchanger 26 after being pressurized through a second fan 29, is subjected to oxygen removal through a deaerator 30, reduces the oxygen content of the nitrogen to below 1ppm, is heated to 170 ℃ through a nitrogen heater 31, and then enters the solid-phase tackifying reactor of the integrated double-component nylon from the reaction section air inlet 14 for recycling.

After being pressurized by a cooling fan 32, nitrogen from the air outlet 16 of the cooling section enters a nitrogen cooler II33 to be cooled to below 35 ℃, and then enters the cooling section of the solid-phase tackifying reactor of the integrated bi-component nylon from the air inlet 18 of the cooling section for recycling.

Compared with a split type device of a dryer, a reactor and a cooler with the same scale, the utility model saves at least 6m of space on the height of the device, can reduce the energy consumption of raw material conveying by about 0.6kw, and saves the annual cost by about 4000 yuan; the rotary blanking device among the dryer, the reactor and the cooler is reduced, and the overall breakage rate of the finished product slices can be reduced by about 30 ppm. In addition, the equipment investment and the building investment are greatly saved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. Solid-phase tackifying reactor of integral bi-component nylon, which is characterized in that: this reactor is by preheating section barrel (1) on upper portion, reaction section barrel (2) and the cooling zone barrel (3) of lower part at middle part, feed inlet (4), preheating section air outlet (5), inlayer preheating section cone (6), outer preheating section cone (7), preheating section air inlet ring (8), preheating section distribution awl (9), preheating section air intake (10), reaction section cone (12), reaction section distribution awl (13), reaction section air intake (14), cooling section return air chamber (15), cooling section air outlet (16), cooling section distribution awl (17), cooling section air intake (18), cooling section cone (19), discharge gate (20) and reactor heat preservation coil pipe (11) are constituteed, its joint system is:

the top of the preheating section cylinder body (1) is closed, a feed inlet (4) and a preheating section air outlet (5) are arranged, and the bottom of the preheating section cylinder body (1) is provided with an annular inverted cone (6) with a downward opening for an inner preheating section and a cone (7) for an outer preheating section; an annular conical cavity between the inner preheating section cone (6) and the outer preheating section cone (7) forms a preheating section air inlet ring (8), and a preheating section air inlet (10) is formed in the outer preheating section cone (7) corresponding to the preheating section air inlet ring (8); a preheating section distribution cone (9) is arranged inside the preheating section cylinder (1) and above the preheating section air inlet ring (8);

the upper part of the reaction section cylinder body (2) is open, the reaction section cylinder body (2) is sleeved on the outer preheating section cone (7) through the opening, and the bottom of the reaction section cylinder body (2) is provided with a reaction section cone (12) which is annular and is in a downward opening type inverted cone shape; a reaction section air inlet (14) is formed in the reaction section cone (12); a reaction section distribution cone (13) is arranged inside the reaction section cylinder (2) and above the reaction section air inlet (14);

the upper part of the cooling section cylinder (3) is open, the cooling section cylinder (3) is sleeved on the reaction section cone (12) through the opening, and a cavity formed between the cooling section cylinder (3) and the reaction section cone (12) is a cooling section air return cavity (15); the reaction section cylinder (2) is communicated with the inside of the cooling section cylinder (3) through an opening of the reaction section cone (12); a cooling section air outlet (16) is arranged on the outer wall of the cooling section air return cavity (15);

the bottom of the cooling section cylinder (3) is provided with a cooling section cone (19) in a closed inverted cone shape; a cooling section air inlet (18) is arranged on the cooling section cone (19); a cooling section distribution cone (17) is arranged inside the cooling section cylinder body (3) and above the cooling section air inlet (18); a discharge hole (20) is formed at the bottom of the cooling section cone (19);

the reactor heat-insulating coil (11) is of a circular tube structure, and a plurality of section inlets and outlets are uniformly wound and fixed on the outer walls of the preheating section cylinder (1) and the reaction section cylinder (2).

2. The one-piece, two-component nylon solid phase tackified reactor of claim 1, wherein: steam or heat conducting oil is adopted as a heat-insulating filling medium in the reactor heat-insulating coil (11), and the process temperature setting of the reactor heat-insulating coil (11) is consistent with the process temperature of the reaction section cylinder (2).

3. The one-piece, two-component nylon solid phase tackified reactor of claim 1, wherein: the preheating section distribution cone (9), the reaction section distribution cone (13) and the cooling section distribution cone (17) are all right triangular cones with upward conical tops, and the conical angle is 30-60 degrees.

4. The one-piece, two-component nylon solid phase tackified reactor of claim 1, wherein: the diameter of the preheating section cylinder (1) is 1-1.2 times of that of the reaction section cylinder (2); the diameter of the cooling section cylinder (3) is 0.6-1 time of that of the reaction section cylinder (2).

5. The one-piece, two-component nylon solid phase tackified reactor of claim 1, wherein: the diameter of an opening of the inner preheating section cone (6) is 0.3-0.8 times of the diameter of the preheating section cylinder (1); the diameter of the opening of the reaction section cone (12) is 0.3-0.8 times of the diameter of the reaction section cylinder (2).

6. The one-piece, two-component nylon solid phase tackified reactor of claim 1, wherein: the diameter of the bottom surface of the preheating section distribution cone (9) is 0.5-1.2 times of the opening diameter of the preheating section air inlet ring (8), and the height of the bottom surface of the preheating section distribution cone from the opening position of the preheating section air inlet ring (8) is about 0.2-1.5 times of the opening diameter.

7. The one-piece, two-component nylon solid phase tackified reactor of claim 1, wherein: the diameter of the bottom surface of the distribution cone (13) of the reaction section is 0.5 to 0.7 times of the diameter of the cylinder (2) of the reaction section, and the height of the bottom surface of the distribution cone from the cylinder (2) of the reaction section is about 0.2 to 0.5 times of the diameter of the bottom surface of the distribution cone.

8. The one-piece, two-component nylon solid phase tackified reactor of claim 1, wherein: the diameter of the bottom surface of the cooling section distribution cone (17) is 0.5-0.7 times of the diameter of the cooling section cylinder (3), and the height of the bottom surface of the cooling section distribution cone from the reaction section cylinder (2) is about 0.2-0.5 times of the diameter of the bottom surface of the distribution cone.

9. Solid-phase tackifying reaction system of integral bi-component nylon, which is characterized in that: the structure of the reactor comprises the solid-phase tackifying reactor of the integrated bi-component nylon of claim 1, a first fan (24), a first nitrogen heater (25), an energy-saving heat exchanger (26), a nitrogen cooler I (27), a spray cooling tower (28), a spray water pump (34), a second fan (29), a deaerator (30), a second nitrogen heater (31), a cooling fan (32) and a nitrogen cooler II (33); the connection relationship is as follows:

an air outlet (5) at the top of a preheating section cylinder (1) of the integrated double-component nylon solid-phase tackifying reactor is respectively connected with a first fan (24) and an energy-saving heat exchanger (26), and an air outlet of the first fan (24) is connected with an air inlet (10) of a preheating section; the energy-saving heat exchanger (26) is sequentially connected with the nitrogen cooler I (27) and the spray cooling tower (28), the spray cooling tower (28) is connected with a second fan (29), and an air outlet of the second fan (29) is sequentially connected with the energy-saving heat exchanger (26), the deaerator (30) and the second nitrogen heater (31) and then connected with a reaction section air inlet (14) of the solid-phase tackifying reactor of the integrated bi-component nylon;

a tee pipeline is arranged on a pipeline between the deaerator (30) and the second nitrogen heater (31), the pipeline is connected with a cooling section air outlet (16), and the pipeline is connected with a cooling fan (32) and a nitrogen cooler II (33) and then connected with a cooling section air inlet (18) of the solid-phase tackifying reactor of the integrated double-component nylon.

10. The system of claim 9, wherein: the spray cooling tower (28) is provided with a spray water pump (34) as water circulation power.

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