Intermittent deep drying system for polyamide
Through the intermittent deep drying system of polyamide, using boiling fluidized beds and vacuum rake dryers and other equipment, combined with the heating of thermal oil coils and the flow of magnetospherics, the problem of moisture in polyamide affecting quality is solved, and efficient and uniform deep drying effect is achieved.
Patent Information
- Application Number
- CN202420560101.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-03-21
AI Technical Summary
The polyamide after reaction in the existing process still contains 0.2% to 0.5% of moisture, which affects its crystallinity, softening points and bonding points, and requires deep drying to meet the qualified standards.
The polyamide batch depth drying system is adopted, which includes a boiling fluidized bed, a meter cooler, a water dewaterer, a heater and a vacuum rake dryer. The deep drying of the polyamide is achieved through the heating, vacuum drying and magnetic ball fluidization of the thermal oil coil.
Effectively reduce the moisture content in polyamide, improve its crystallinity and quality, avoid material agglomeration, easy operation, high degree of automation, and controllable product quality.
Smart Images
Figure CN222703662U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of polyamide drying and reaction, in particular to a polyamide intermittent deep drying system. Background Art
[0002] In the existing process, the polyamide after the reaction still contains 0.2% to 0.5% water. If you want to get qualified polyamide, you need to reduce the water content in the polyamide to 0.001% to 0.005%, otherwise the water content will affect the crystallinity, softening point and bonding point of the polyamide. In order to ensure product quality, polyamide needs to go through a deep drying process. Utility Model Content
[0003] The utility model aims to provide a polyamide intermittent deep drying system, so as to obtain qualified polyamide intermittent products.
[0004] To achieve the above-mentioned purpose, the utility model provides a polyamide intermittent deep drying system, which includes a boiling fluidized bed, a surface cooler, a dehydrator, a heater and a vacuum rake dryer; the surface cooler is connected to the top of the boiling fluidized bed, the dehydrator is connected to the surface cooler, one end of the heater is connected to the dehydrator, and the other end of the heater is connected to the boiling fluidized bed; the vacuum rake dryer is connected to the discharge port of the boiling fluidized bed.
[0005] In one embodiment, a wet material inlet and a magnetic ball inlet are also provided at the top of the boiling fluidized bed. Magnetic balls are also added into the boiling fluidized bed, and the magnetic balls enter the boiling fluidized bed through the magnetic ball inlet.
[0006] In one embodiment, a circulating cooling water outlet is provided at the top of the cooler, and a circulating cooling water inlet is provided at the bottom of the cooler; circulating cooling water is input from the bottom of the cooler and output from the top of the cooler, so as to cool the gas discharged from the boiling fluidized bed; the cooler is any one of shell and tube type, plate type, and fin type.
[0007] In one embodiment, a circulating fan is further provided between the heater and the dehydrator.
[0008] In one embodiment, a heat transfer oil outlet is provided at the top of the heater, and a heat transfer oil outlet is provided at the bottom of the heater; the heat transfer oil is input from the bottom of the heater and output from the top of the heater, thereby heating the gas.
[0009] In one embodiment, the boiling fluidized bed is a containerized special boiling fluidized bed, which is also provided with a heat transfer oil coil and a bag dust collector; the heat transfer oil coil is provided with heat transfer oil for heating and drying the wet material in the boiling fluidized bed; a magnetic ball outlet and a magnetic ball discharge valve are also provided on one side of the boiling fluidized bed.
[0010] In one embodiment, a discharge valve and a two-position ball valve are provided on a pipeline connecting the vacuum rake dryer and the discharge port of the boiling fluidized bed. The discharge valve is close to the boiling fluidized bed, and the two-position ball valve is close to the vacuum rake dryer.
[0011] In one embodiment, a cooler is further provided, which is connected to the top of the vacuum rake dryer, and a vacuum system is provided in the cooler. A circulating water inlet is provided on one side of the cooler, a circulating water outlet is provided on the other side of the cooler, and a waste water outlet is provided at the bottom of the cooler; circulating water enters from the circulating water inlet and then outputs from the circulating water outlet, so that the exhaust gas discharged from the vacuum rake dryer is cooled through the cooler and then discharged by the vacuum system; the vacuum system is of the type of water ring vacuum pump + Roots vacuum pump; the cooler is any one of shell and tube type, plate type, and fin type.
[0012] In one embodiment, the vacuum rake dryer is further provided with a jacket, a shaft tube, a heat transfer oil inlet, a heat transfer oil outlet and an arc top valve; the heat transfer oil is input into the jacket and the shaft tube from the heat transfer oil inlet and input from the heat transfer oil outlet, so as to heat and dry the material in the vacuum rake dryer; the arc top valve is arranged at the discharge port of the vacuum rake dryer; the shaft end seal of the vacuum rake dryer adopts a two-stage combined shaft end seal structure of a packing seal and a mechanical seal.
[0013] The utility model also provides a polyamide intermittent deep drying method, which comprises the following steps:
[0014] (1) Turn on the circulating fan, control the gas temperature to 25-30°C after cooling by the surface cooler, control the gas temperature to 180-240°C after heating by the heater, turn on the thermal oil coil in the boiling fluidized bed, and control the temperature of the thermal oil coil to 180-240°C;
[0015] (2) Add the wet material and magnetic balls into the boiling fluidized bed, and let the wet material stay in the boiling fluidized bed for 1-1.5 hours;
[0016] (3) Open the discharge valve and the two-position ball valve, the material enters the vacuum rake dryer, turn on the vacuum rake dryer and the vacuum system, control the negative pressure, and the material stays in the vacuum rake dryer for 1-1.5 hours;
[0017] (4) Open the arc top valve to discharge the material and obtain deeply dried polyamide.
[0018] Compared with the prior art, the utility model has at least the following advantages:
[0019] 1. The boiling fluidized bed of the utility model has the advantages of low energy consumption and no dust overflow; the utility model realizes the multi-functions of thermal oil coil, fluidized bed and bag dust collector in one equipment, the boiling fluidized bed. The thermal oil coil provides 50-60% calorific value, low hot air volume and less energy loss. The dust generated during the drying process is always in the boiling fluidized bed, and the system environment is good.
[0020] 2. In the polyamide intermittent deep drying system of the utility model, the constant speed section and the speed reduction section of the polyamide deep drying process are controlled separately, the residence time is prolonged, and the speed reduction section adopts a vacuum drying method, which increases the drying speed and reduces the drying gas phase equilibrium pressure.
[0021] 3. In the polyamide intermittent deep drying system of the utility model, the polyamide powder is dried more evenly and thoroughly under the fluidization effect of the magnetic balls in the boiling fluidized bed, and the agglomeration of the material is avoided.
[0022] 4. The intermittent deep drying system of polyamide of the utility model adopts the operation mode of normal pressure + negative pressure, has the advantages of simple operation, high degree of automation, and controllable product quality. The utility model can be widely promoted and applied to the deep drying of materials such as resin, nylon, polyamide, etc., and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0024] Figure 1 It is a structural schematic diagram of a polyamide intermittent deep drying system according to an embodiment of the utility model.
[0025] Among them, the figure numerals are: boiling fluidized bed 1; surface cooler 2; dehydrator 3; circulating fan 4; heater 5; discharge valve 6; magnetic ball discharge valve 7; two-position ball valve 8; vacuum rake dryer 9; cooler 10 and arc top valve 11. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] The utility model aims to provide a polyamide intermittent deep drying system and method.
[0028] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0029] Figure 1 The schematic diagram of the structure of the intermittent deep drying system of polyamide of one embodiment of the utility model. The intermittent deep drying system of polyamide of the utility model comprises a boiling fluidized bed 1, a surface cooler 2, a dehydrator 3, a heater 5 and a vacuum rake dryer 9; the surface cooler 2 is connected to the top of the boiling fluidized bed 1, the dehydrator 3 is connected to the surface cooler 2, one end of the heater 5 is connected to the dehydrator 3, and the other end of the heater 5 is connected to the boiling fluidized bed 1. The gas discharged from the boiling fluidized bed 1 is processed by the surface cooler 2 and the dehydrator 3, and then enters the heater 5 for heating. The heated gas is input from the bottom of the boiling fluidized bed 1 for recycling; the vacuum rake dryer 9 is connected to the discharge port of the boiling fluidized bed 1.
[0030] Preferably, a wet material inlet and a magnetic ball inlet are also provided at the top of the boiling fluidized bed 1, and magnetic balls are added to the boiling fluidized bed 1, and the magnetic balls enter the boiling fluidized bed 1 through the magnetic ball inlet. The wet material is dried more evenly and thoroughly under the fluidization effect of the magnetic balls, and the occurrence of material agglomeration can be avoided.
[0031] Preferably, a circulating cooling water outlet is provided at the top of the cooler 2, and a circulating cooling water inlet is provided at the bottom of the cooler 2; the circulating cooling water is input from the bottom of the cooler 2 and output from the top of the cooler 2, so as to cool the gas discharged from the boiling fluidized bed 1; the cooler 2 is any one of a shell and tube type, a plate type, and a fin type.
[0032] Preferably, a circulating fan 4 is further provided between the heater 5 and the water remover 3 .
[0033] Preferably, a heat transfer oil outlet is provided at the top of the heater 5 and a heat transfer oil outlet is provided at the bottom of the heater 5; the heat transfer oil is input from the bottom of the heater 5 and output from the top of the heater 5, thereby heating the gas.
[0034] Preferably, the boiling fluidized bed 1 is a containerized special boiling fluidized bed, which is also provided with a heat transfer oil coil and a bag dust collector; the heat transfer oil coil is provided with heat transfer oil for heating and drying the wet material in the boiling fluidized bed 1; a magnetic ball outlet and a magnetic ball discharge valve 7 are also provided on one side of the boiling fluidized bed 1.
[0035] Preferably, a discharge valve 6 and a two-position ball valve 8 are provided on the pipeline connecting the vacuum rake dryer 9 and the discharge port of the boiling fluidized bed 1 , wherein the discharge valve 6 is close to the boiling fluidized bed 1 , and the two-position ball valve 8 is close to the vacuum rake dryer 9 .
[0036] Preferably, a cooler 10 is also provided, the cooler 10 is connected to the top of the vacuum rake dryer 9, a vacuum system is provided in the cooler 10, a circulating water inlet is provided on one side of the cooler 10, a circulating water outlet is provided on the other side of the cooler 10, and a wastewater outlet is provided at the bottom of the cooler 10; the circulating water enters from the circulating water inlet and then outputs from the circulating water outlet, so that the exhaust gas discharged from the vacuum rake dryer 9 is cooled through the cooler 10 and then discharged by the vacuum system; the vacuum system is of the type of water ring vacuum pump + Roots vacuum pump; the cooler 10 is any one of shell and tube type, plate type, and fin type.
[0037] Preferably, the vacuum rake dryer 9 is also provided with a jacket, a shaft tube, a heat transfer oil inlet, a heat transfer oil outlet and an arc top valve 11; the heat transfer oil is input into the jacket and the shaft tube from the heat transfer oil inlet, and is input from the heat transfer oil outlet, so as to heat and dry the material in the vacuum rake dryer 9; the arc top valve 11 is arranged at the discharge port of the vacuum rake dryer 9; the shaft end seal of the vacuum rake dryer 9 adopts a two-stage combined shaft end seal structure of a packing seal and a mechanical seal.
[0038] The intermittent deep drying method of polyamide of the utility model comprises the following steps:
[0039] (1) Turn on the circulating fan 4, control the gas temperature to 25-30°C after cooling by the surface cooler 2, control the gas temperature to 180-240°C after heating by the heater 5, turn on the thermal oil coil in the boiling fluidized bed 1, and control the temperature of the thermal oil coil to 180-240°C;
[0040] (2) adding the wet material and the magnetic balls into the boiling fluidized bed 1, and the wet material stays in the boiling fluidized bed 1 for 1-1.5 hours;
[0041] (3) Open the discharge valve 6 and the two-position ball valve 7, and the material enters the vacuum rake dryer 9. The vacuum rake dryer 9 and the vacuum system are turned on, and the negative pressure is controlled to be 0.095 MPa. The material stays in the vacuum rake dryer 9 for 1-1.5 hours;
[0042] (4) Open the arc top valve 11 to discharge the material and obtain deeply dried polyamide.
[0043] The gas at 180-240°C in the boiling fluidized bed 1 is collected and discharged at the top, and is dehumidified by the surface cooler 2 and the dehumidifier 3 in turn. The temperature of the dehumidified gas drops to 35-40°C, and is pressurized to 5-8kPa by the circulating fan 4, and then input into the heater 5. The heater 5 heats the gas to 180-240°C and returns to the boiling fluidized bed 1 for recycling.
[0044] The wet material is discharged after being dried in the boiling fluidized bed 1 for 1-1.5 hours and transported to the vacuum rake dryer 9. The material is heated to 180-240°C by the jacket and shaft tube of the vacuum rake dryer 9 and then discharged through the discharge port. The tail gas in the vacuum rake dryer 9 is cooled by the cooler 10 and then discharged by the vacuum system of the cooler 10.
[0045] Compared with the prior art, the utility model has at least the following advantages:
[0046] 1. The boiling fluidized bed of the utility model has the advantages of low energy consumption and no dust overflow; the utility model realizes the multi-functions of thermal oil coil, fluidized bed and bag dust collector in one equipment, the boiling fluidized bed. The thermal oil coil provides 50-60% calorific value, low hot air volume and less energy loss. The dust generated during the drying process is always in the boiling fluidized bed, and the system environment is good.
[0047] 2. In the polyamide intermittent deep drying system of the utility model, the constant speed section and the speed reduction section of the polyamide deep drying process are controlled separately, the residence time is prolonged, and the speed reduction section adopts a vacuum drying method, which increases the drying speed and reduces the drying gas phase equilibrium pressure.
[0048] 3. In the polyamide intermittent deep drying system of the utility model, the polyamide powder is dried more evenly and thoroughly under the fluidization effect of the magnetic balls in the boiling fluidized bed, and the agglomeration of the material is avoided.
[0049] 4. The intermittent deep drying system of polyamide of the utility model adopts the operation mode of normal pressure + negative pressure, has the advantages of simple operation, high degree of automation, and controllable product quality. The utility model can be widely promoted and applied to the deep drying of materials such as resin, nylon, polyamide, etc., and has broad application prospects.
[0050] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.
Claims
1. A polyamide intermittent deep drying system, characterized in that: include: A boiling fluidized bed (1), a surface cooler (2), a dewatering device (3), a heater (5) and a vacuum rake dryer (9); the surface cooler (2) is connected to the top of the boiling fluidized bed (1), the dewatering device (3) is connected to the surface cooler (2), one end of the heater (5) is connected to the dewatering device (3), and the other end of the heater (5) is connected to the boiling fluidized bed (1); the vacuum rake dryer (9) is connected to the discharge port of the boiling fluidized bed (1).
2. The polyamide intermittent deep drying system according to claim 1, characterized in that: The top of the boiling fluidized bed (1) is also provided with a wet material inlet and a magnetic ball inlet. Magnetic balls are also added to the boiling fluidized bed (1), and the magnetic balls enter the boiling fluidized bed (1) through the magnetic ball inlet.
3. The polyamide intermittent deep drying system according to claim 1, characterized in that: The top of the cooler (2) is provided with a circulating cooling water outlet, and the bottom of the cooler (2) is provided with a circulating cooling water inlet; circulating cooling water is input from the bottom of the cooler (2) and output from the top of the cooler (2), so as to cool the gas discharged from the boiling fluidized bed (1); the cooler (2) is any one of a shell and tube type, a plate type, and a fin type.
4. The polyamide intermittent deep drying system according to claim 1, characterized in that: A circulating fan (4) is also provided between the heater (5) and the dehydrator (3).
5. The polyamide intermittent deep drying system according to claim 1, characterized in that: The top of the heater (5) is provided with a heat transfer oil outlet, and the bottom of the heater (5) is provided with a heat transfer oil outlet; the heat transfer oil is input from the bottom of the heater (5) and output from the top of the heater (5), thereby heating the gas.
6. The polyamide intermittent deep drying system according to claim 1, characterized in that: The boiling fluidized bed (1) is a containerized boiling fluidized bed, and is also provided with a heat transfer oil coil and a bag dust collector; the heat transfer oil coil is provided with heat transfer oil for heating and drying wet materials in the boiling fluidized bed (1); a magnetic ball outlet and a magnetic ball discharge valve (7) are also provided on one side of the boiling fluidized bed (1).
7. The polyamide intermittent deep drying system according to claim 1, characterized in that: A discharge valve (6) and a two-position ball valve (8) are provided on a pipeline connecting the vacuum rake dryer (9) and the discharge port of the boiling fluidized bed (1), wherein the discharge valve (6) is close to the boiling fluidized bed (1), and the two-position ball valve (8) is close to the vacuum rake dryer (9).
8. The polyamide intermittent deep drying system according to claim 1, characterized in that: A cooler (10) is also provided, the cooler (10) is connected to the top of the vacuum rake dryer (9), a vacuum system is provided in the cooler (10), a circulating water inlet is provided on one side of the cooler (10), a circulating water outlet is provided on the other side of the cooler (10), and a waste water outlet is provided at the bottom of the cooler (10); circulating water enters from the circulating water inlet and then is output from the circulating water outlet, so that the exhaust gas discharged from the vacuum rake dryer (9) is cooled through the cooler (10) and then discharged by the vacuum system; the vacuum system is of the type of a water ring vacuum pump + a Roots vacuum pump; the cooler (10) is any one of a shell and tube type, a plate type, and a fin type.
9. The polyamide intermittent deep drying system according to claim 1, characterized in that: The vacuum rake dryer (9) is also provided with a jacket, a shaft tube, a heat transfer oil inlet, a heat transfer oil outlet and an arc top valve (11); the heat transfer oil is input into the jacket and the shaft tube from the heat transfer oil inlet and input into the heat transfer oil outlet, thereby heating and drying the material in the vacuum rake dryer (9); the arc top valve (11) is arranged at the discharge port of the vacuum rake dryer (9); the shaft end seal of the vacuum rake dryer (9) adopts a two-stage combined shaft end seal structure of a packing seal and a mechanical seal.