CN110726288A - Material cooling system and cooling method of drying bed for polymer - Google Patents
Material cooling system and cooling method of drying bed for polymer Download PDFInfo
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- CN110726288A CN110726288A CN201911124114.6A CN201911124114A CN110726288A CN 110726288 A CN110726288 A CN 110726288A CN 201911124114 A CN201911124114 A CN 201911124114A CN 110726288 A CN110726288 A CN 110726288A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/003—Supply-air or gas filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/003—Handling, e.g. loading or unloading arrangements for articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
Abstract
The invention discloses a material cooling system and a material cooling method of a drying bed for polymers, and relates to the technical field of cooling devices. A drying bed (3) for removing polymer moisture, a primary cooling device (1) for cooling, a secondary cooling device (2) with a refrigerator (203), a cyclone separator (4) for separating and exhausting air carrying materials after cooling and a storage box (5) for storing the materials; a second temperature sensor (306) is arranged in the secondary cooling area (303); a refrigerant valve (209) for controlling the amount of refrigerant entering is provided at the refrigerant inlet (207). The invention has the beneficial technical effects that: a two-stage cooling system is arranged, natural air and cooling air are combined for cooling, the cooling effect, cooling equipment and time cost factors are comprehensively considered, and dynamic adjustment and optimization of the cooling process are realized; natural wind and cooling wind are filtered and dehumidified, and basically have no other adverse effects on materials; and discharging after the temperature reduction is qualified through detection, and introducing no impurities and removing materials.
Description
Technical Field
The invention relates to the technical field of cooling, in particular to a material cooling system of a drying bed for a polymer and a cooling method thereof, which can be applied to a cooling process after polyacrylamide is dried.
Background
The polymer generally refers to a high molecular compound, and includes a natural high molecular compound and a synthetic high molecular compound. In the synthetic chemistry industry, generally, polymers generated by reaction need to be dried, hot air or high-temperature drying is mainly used in the drying process, the internal temperature of the dried polymers is closer to the temperature parameters of the previous drying, the polymers need to be cooled, and the polymers cannot be directly packaged or enter a product manufacturing link.
Disclosure of Invention
The invention provides a material cooling system of a drying bed for polymers and a cooling method thereof.
The concrete technical scheme is a dry bed material cooling system for polymer, includes: the system comprises a drying bed for removing polymer moisture, a primary cooling device and a secondary cooling device for cooling, a cyclone separator for separating and exhausting air carrying materials after cooling and a storage box for storing the materials;
the drying bed is sequentially provided with a drying area, a primary cooling area, a secondary cooling area and a discharge hole;
in the primary cooling device, a first air inlet is connected with a natural wind filter, the natural wind filter is connected with a first induced draft fan, the first induced draft fan is connected with a natural wind dehumidifier, and the natural wind dehumidifier is connected with a primary cooling area of the drying bed through a natural wind pipeline;
in the secondary cooling device, a second air inlet is connected with a cooling air filter, the cooling air filter is connected with a refrigerator, the refrigerator is connected with a second induced draft fan, the second induced draft fan is connected with a cooling air dehumidifier, the cooling air dehumidifier is connected with a secondary cooling area of the drying bed through a cooling air pipeline, a second temperature sensor is arranged in the secondary cooling area, and the second temperature sensor displays the temperature of materials in the secondary cooling area; the refrigerator is provided with a refrigerant inlet and a refrigerant outlet, and the refrigerant inlet is provided with a refrigerant valve for controlling the entering amount of the refrigerant; when the refrigerant valve is fully opened, the cooling capacity to natural air is strongest, namely the temperature of cooling air is lower, and the cooling effect of the secondary cooling device to materials is enhanced;
the lower part of the cyclone separator is provided with a material outlet, and the upper part of the cyclone separator is provided with a bent pipe-shaped exhaust port. During exhaust, impurities in the atmosphere are prevented from falling into the cyclone separator; the cyclone separator has the function of separating the materials in the air out and dropping the materials into the storage box again.
The natural wind dehumidifier and the cooling wind dehumidifier are respectively arranged at the rear ends of the primary cooling device and the secondary cooling device, namely at positions close to the drying bed, so as to ensure that the water content of the natural wind and the cooling wind which are introduced into the drying bed for cooling is at an extremely low level and the water content of the dried polymer is not influenced basically.
Further, a first temperature sensor is arranged in the primary cooling area and is arranged at a position close to the secondary cooling area; the second temperature sensor is installed at a position close to the discharge hole. The first temperature sensor displays the temperature of the material in the primary cooling area, and the temperature of the material detected by the first temperature sensor is closer to the temperature of the material entering the secondary cooling area; the material temperature that second temperature sensor detected is more close ejection of compact temperature, is less than 30 ℃ and can ejection of compact, and when the temperature was higher than 30 ℃, the blowing was stopped, continues the cooling.
Furthermore, the first temperature sensor, the second temperature sensor, the first induced draft fan, the second induced draft fan and the refrigerant valve are respectively connected with the controller. When the controller is not connected, a worker manually adjusts the opening degrees of the first induced draft fan, the second induced draft fan and the refrigerant valve according to the temperature values of the first temperature sensor and the second temperature sensor; after the controller is respectively accessed, relevant parameters can be set for automatic adjustment control.
A cooling method of a material cooling system of a drying bed for polymers comprises the following steps:
s1, starting the primary cooling device, wherein the first induced draft fan is in a fully open state, and the working time of the primary cooling device for the same batch of materials is ta;
s2, according to the temperature value Ta of the first temperature sensor, when Ta is more than 30 ℃, operating according to S3; when Ta is less than or equal to 30 ℃, operating according to S4;
s3, starting a secondary cooling device, enabling a second induced draft fan and a refrigerant valve to work in the same opening state, and carrying out the next step when the temperature Tb of a second temperature sensor is less than or equal to 30 ℃, wherein the working time of the secondary cooling device for the same batch of materials is Tb, and Tb is less than or equal to ta;
s4, closing the secondary cooling device, opening the discharge hole, and enabling the materials to fall into a storage box; when the temperature is reduced, the cyclone separator is started, gas is discharged from the exhaust port, and the separated materials fall into the material storage box from the outlet.
Further, the working time of the first-level cooling device is ta, which is less than the drying time of the material in the drying area. The drying time is generally 2h, and the cooling time is adjusted by taking 10 minutes as a unit.
Taking polyacrylamide as an example, the water content of the colloidal polyacrylamide is more than 70%, the colloidal polyacrylamide is placed in a drying area of a drying bed, hot air is introduced for drying, and the water content of the dried polyacrylamide is greatly reduced and can be controlled to be less than 10%; at this time, the temperature of polyacrylamide is high, and needs to be reduced. Natural wind contains impurities such as dust and the like, the humidity is high, the natural wind needs to be filtered and dehumidified, the natural wind can be respectively treated by a natural wind filter and a natural wind dehumidifier, and the natural wind filter and the natural wind dehumidifier are introduced into a primary cooling area by a first induced draft fan to primarily cool polyacrylamide which is pushed into the primary cooling area and has high temperature; in the secondary cooling device, a refrigerant is introduced into the refrigerator, the temperature of air is reduced, the cooling effect can be enhanced, and the polyacrylamide pushed into the secondary cooling area is reduced to 30 ℃. When the temperature displayed by the second temperature sensor is lower than 30 ℃, the discharge hole can be opened to discharge the materials to the material storage box; the cooled gas carries a small amount of materials to enter a cyclone separator, and the cyclone separator has the function of separating the materials in the air, dropping the materials into a storage box again and discharging redundant gas in the system.
The temperature difference between the polyacrylamide which is just dried and natural wind is large, the natural wind has a good cooling effect, the first draught fan is fully opened due to the fact that the natural wind has no cooling cost, the natural wind is utilized to the maximum extent for cooling, the cooling effect of the natural wind is reduced along with the reduction of the temperature of the polyacrylamide, and the temperature reduction degree is reduced in the same cooling time; in the secondary cooling device, the temperature of the air is reduced by the refrigerant to form cooling air, the temperature difference between the cooling air and the polyacrylamide passing through the primary cooling device is large, the cooling effect of the cooling air is good, and the cooling time can be shortened. Refrigeration needs cost, and the cost and the cooling effect are comprehensively considered by combining the primary cooling device and the secondary cooling device. In addition, in the specific cooling process, the coordination of all the time in the whole production line needs to be considered.
The invention has the beneficial technical effects that: a two-stage cooling system is arranged, natural air and cooling air are combined for cooling, the cooling effect, cooling equipment and time cost factors are comprehensively considered, and dynamic adjustment and optimization of the cooling process are realized; natural wind and cooling wind are filtered and dehumidified, and basically have no other adverse effects on materials; and discharging after the temperature reduction is qualified through detection, and introducing no impurities and removing materials.
Drawings
FIG. 1 is a schematic view of a system for cooling a polymer drying bed material in example 1;
FIG. 2 is a schematic view of a system for cooling a material in a drying bed for a polymer in example 2;
FIG. 3 is a schematic view showing the connection of the control part of the system for cooling the bed material for drying polymer in example 2.
Description of reference numerals:
1. a primary cooling device 2, a secondary cooling device 3, a drying bed 4, a cyclone separator 5 and a storage box;
101. the system comprises a first air inlet 102, a natural air filter 103, a first induced draft fan 104, a natural air dehumidifier 105 and a natural air pipeline;
201. a second air inlet 202, a cooling air filter 203, a refrigerator 204, a second induced draft fan 205, a cooling air dehumidifier 206, a cooling air pipeline 207, a refrigerant inlet 208, a refrigerant outlet 209 and a refrigerant valve;
301. a drying area 302, a first-stage cooling area 303, a second-stage cooling area 304, a discharge hole 305, a first temperature sensor 306 and a second temperature sensor;
401. material outlet 402, exhaust port.
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings and examples:
it should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the following claims, and all modifications of the structures, changes in the proportions and adjustments of the sizes and other dimensions which are within the scope of the disclosure should be understood and encompassed by the present disclosure without affecting the efficacy and attainment of the same.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Example 1: fig. 1, a system for cooling polymer drying bed material, comprising: the drying bed 3 for removing the water of the polymer, the primary cooling device 1 and the secondary cooling device 2 for cooling, the cyclone separator 4 for separating and exhausting air carrying the materials after cooling and the storage box 5 for storing the materials;
the drying bed 3 is sequentially provided with a drying area 301, a first-stage cooling area 302, a second-stage cooling area 303 and a discharge hole 304;
in the primary cooling device 1, a first air inlet 101 is connected with a natural air filter 102, the natural air filter 102 is connected with a first induced draft fan 103, the first induced draft fan 103 is connected with a natural air dehumidifier 104, and the natural air dehumidifier 104 is connected with a primary cooling area 302 of the drying bed 3 through a natural air pipeline 105;
in the secondary cooling device 2, a second air inlet 201 is connected with a cooling air filter 202, the cooling air filter 202 is connected with a refrigerator 203, the refrigerator 203 is connected with a second induced draft fan 204, the second induced draft fan 204 is connected with a cooling air dehumidifier 205, the cooling air dehumidifier 205 is connected with a secondary cooling area 303 of the drying bed 3 through a cooling air pipeline 206, a second temperature sensor 306 is arranged in the secondary cooling area 303, and the second temperature sensor 306 displays the temperature of materials in the secondary cooling area 303; the refrigerator 203 is provided with a refrigerant inlet 207 and a refrigerant outlet 208, and a refrigerant valve 209 for controlling the entering amount of the refrigerant is arranged at the refrigerant inlet 207;
the cyclone 4 is provided with a material outlet 401 at the lower part and a bent exhaust port 402 at the upper part. During exhaust, impurities in the atmosphere are prevented from falling into the cyclone separator; the cyclone separator has the function of separating the materials in the air out and dropping the materials into the storage box again.
The cooling method comprises the following operation: starting the primary cooling device 1, wherein the first induced draft fan 103 is in a fully open state, and the working time is ta; the secondary cooling device 2 is started, the second induced draft fan 204 and the refrigerant valve 209 work in the same opening state, when the temperature Tb of the second temperature sensor 306 is less than or equal to 30 ℃, the discharge hole 304 is opened, the material falls into the material storage box 5, the working time of the secondary cooling device 2 is Tb, and Tb is less than or equal to ta; when the temperature is reduced, the cyclone separator 4 is opened, gas is discharged from the gas outlet 402, and the separated material falls into the material storage box 5 from the outlet 401.
Example 2: on the basis of the cooling system in the embodiment 1,
fig. 2, a first temperature sensor 305 is provided in the primary cooling zone 302, and the first temperature sensor 305 is installed at a position close to the secondary cooling zone 303; a second temperature sensor 306 is mounted proximate to the spout 304.
In fig. 3, the first temperature sensor 305, the second temperature sensor 306, the first induced draft fan 103, the second induced draft fan 204 and the refrigerant valve 209 are respectively connected to the controller. When the controller is not connected, a worker manually adjusts the opening degrees of the first induced draft fan 103, the second induced draft fan 204 and the refrigerant valve 209 according to the temperature values of the first temperature sensor 305 and the second temperature sensor 306; after the controller is respectively accessed, relevant parameters can be set for automatic adjustment control.
A cooling method of a material cooling system of a drying bed for polymers comprises the following steps:
s1, starting the primary cooling device 1, and enabling the first induced draft fan 103 to be in a fully open state for a working time of ta;
s2, according to the temperature value Ta of the first temperature sensor 305, when Ta is more than 30 ℃, the operation is carried out according to S3; when Ta is less than or equal to 30 ℃, operating according to S4;
s3, starting the secondary cooling device 2, enabling the second induced draft fan 204 and the refrigerant valve 209 to work in the same opening state, and carrying out the next step when the temperature Tb of the second temperature sensor 306 is less than or equal to 30 ℃, wherein the working time of the secondary cooling device 2 is Tb, and Tb is less than or equal to ta;
s4, closing the secondary cooling device 2, opening the discharge hole 304, and enabling the materials to fall into the storage box 5; when the temperature is reduced, the cyclone separator 4 is opened, gas is discharged from the gas outlet 402, and the separated material falls into the material storage box 5 from the outlet 401.
The working time ta of the first-level cooling device 1 is less than the drying time of the material in the drying area 301. The drying time is generally 2h, and the cooling time is adjusted by taking 10 minutes as a unit. The temperature of the refrigerant is about minus 5 ℃, ta is 1 to 2 hours, tb is 0 to 1 hour, and the opening degrees of the second induced draft fan 204 and the refrigerant valve 209 are 60 percent.
When the material drying temperature rises or the season changes and causes the natural wind temperature to rise, under the same cooling time, the Ta that detects can be on the high side, at this moment, can suitably increase second draught fan 204 and refrigerant valve 209 aperture, for example the aperture is 80%, increase the cooling air amount of wind and the total cold volume of taking, increase cooling intensity to adapt to different factor change demands.
Taking polyacrylamide, an extremely important oilfield chemical, as an example, polyacrylamide is used as a lubricant, a suspending agent, a clay stabilizer, an oil displacement agent and a thickening agent, and is widely applied to well drilling, acidification, fracturing, water plugging, well cementation, secondary oil recovery and tertiary oil recovery. The polyacrylamide is a linear high molecular polymer, the synthesized polyacrylamide is colloidal, the water content of the material extruded by an extruder is more than 70%, the material is usually required to be placed on a drying bed for hot air drying treatment, the hot air temperature is 70-120 ℃, and the drying time is about 2 hours; the temperature of the dried polyacrylamide material is between 70 and 120 ℃, and the temperature is required to be reduced to about 30 ℃ when the temperature is too high and then the polyacrylamide material enters the next procedure depending on the hot air temperature and the drying time. At present, the temperature is reduced by adopting a natural cooling mode, the temperature reduction speed is low, the required time is long, and the subsequent production is influenced.
The water content of the colloidal polyacrylamide is more than 70 percent, the colloidal polyacrylamide is placed in a drying area of a drying bed 3, hot air is introduced for drying, and the water content of the dried polyacrylamide is greatly reduced and can be controlled to be less than 10 percent; at this time, the temperature of polyacrylamide is high, and needs to be reduced. Natural wind contains impurities such as dust and the like, the humidity is high, the natural wind needs to be filtered and dehumidified, the natural wind can be respectively treated by a natural wind filter 102 and a natural wind dehumidifier 104, the natural wind is introduced into a primary cooling area 302 by a first induced draft fan 103, and the polyacrylamide pushed into the primary cooling area 302 and having high temperature is primarily cooled; in the secondary cooling device 2, a refrigerant is introduced into the refrigerator 203 to reduce the temperature of air, so that the cooling effect can be enhanced, and the polyacrylamide pushed into the secondary cooling area 303 is reduced to 30 ℃. When the temperature displayed by the second temperature sensor 306 is lower than 30 ℃, the discharge hole 304 can be opened to discharge the materials to the storage box 5; the cooled gas carries a small amount of materials to enter the cyclone separator 4, and the cyclone separator 4 has the function of separating the materials in the air, falling into the storage box 5 again and discharging the redundant gas in the system.
The temperature difference between the polyacrylamide which is just dried and natural wind is large, the natural wind has a good cooling effect, the first draught fan 103 is fully opened due to the fact that the natural wind has no cooling cost, the natural wind is utilized to the maximum extent for cooling, the cooling effect of the natural wind is reduced along with the reduction of the temperature of the polyacrylamide, and the temperature reduction degree is reduced in the same cooling time; in the secondary cooling device 2, the temperature of the air is reduced by the refrigerant to form cooling air, the temperature difference between the cooling air and the polyacrylamide passing through the primary cooling device 1 is large, the cooling effect of the cooling air is good, and the cooling time can be shortened. Refrigeration needs cost, and the primary cooling device 1 and the secondary cooling device 2 are combined, so that the cost and the cooling effect are comprehensively considered. In addition, in the specific cooling process, the coordination of all the time in the whole production line needs to be considered.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (5)
1. A material cooling system of a drying bed for polymers, which is characterized in that,
the method comprises the following steps: a drying bed (3) for removing polymer moisture, a primary cooling device (1) and a secondary cooling device (2) for cooling, a cyclone separator (4) for separating and exhausting air carrying materials after cooling and a storage box (5) for storing the materials;
the drying bed (3) is sequentially provided with a drying area (301), a primary cooling area (302), a secondary cooling area (303) and a discharge hole (304);
in the primary cooling device (1), a first air inlet (101) is connected with a natural wind filter (102), the natural wind filter (102) is connected with a first induced draft fan (103), the first induced draft fan (103) is connected with a natural wind dehumidifier (104), and the natural wind dehumidifier (104) is connected with a primary cooling area (302) of the drying bed (3) through a natural wind pipeline (105);
in the secondary cooling device (2), a second air inlet (201) is connected with a cooling air filter (202), the cooling air filter (202) is connected with a refrigerator (203), the refrigerator (203) is connected with a second induced draft fan (204), the second induced draft fan (204) is connected with a cooling air dehumidifier (205), the cooling air dehumidifier (205) is connected with a secondary cooling area (303) of the drying bed (3) through a cooling air pipeline (206), and a second temperature sensor (306) is arranged in the secondary cooling area (303); the refrigerating machine (203) is provided with a refrigerant inlet (207) and a refrigerant outlet (208), and a refrigerant valve (209) for controlling the refrigerant inlet amount is arranged at the refrigerant inlet (207);
a material outlet (401) is arranged below the cyclone separator (4), and a bent-pipe-shaped exhaust port (402) is arranged above the cyclone separator.
2. The system for cooling the material in the drying bed for the polymer as claimed in claim 1, wherein a first temperature sensor (305) is disposed in the primary cooling zone (302), and the first temperature sensor (305) is installed at a position close to the secondary cooling zone (303); the second temperature sensor (306) is mounted proximate the outlet (304).
3. The system for cooling the materials in the drying bed for the polymer as claimed in claim 2, wherein the first temperature sensor (305), the second temperature sensor (306), the first induced draft fan (103), the second induced draft fan (204) and the refrigerant valve (209) are respectively connected with the controller.
4. A method of cooling a polymer bed material cooling system according to any one of claims 1 to 3,
the method comprises the following steps:
s1, starting the primary cooling device (1), wherein the first induced draft fan (103) is in a fully open state, and the working time of the primary cooling device (1) of the same batch of materials is ta;
s2, according to the temperature value Ta of the first temperature sensor (305), when Ta is more than 30 ℃, the operation is carried out according to S3; when Ta is less than or equal to 30 ℃, operating according to S4;
s3, starting the secondary cooling device (2), enabling the second induced draft fan (204) and the refrigerant valve (209) to work in the same opening state, and carrying out the next step when the temperature Tb of the second temperature sensor (306) is less than or equal to 30 ℃, wherein the working time of the secondary cooling device (2) for the same batch of materials is Tb, and Tb is less than or equal to ta;
s4, closing the secondary cooling device (2), opening the discharge hole (304), and enabling the materials to fall into the storage box (5); when the temperature is reduced, the cyclone separator (4) is opened, gas is discharged from the exhaust port (402), and separated materials fall into the storage box (5) from the outlet (401).
5. The method for cooling a material in a polymer drying bed according to claim 4, wherein the primary cooling device (1) has an operating time ta less than the drying time of the material in the drying zone (301).
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