CN211643879U - Gas transportation system for resin production - Google Patents
Gas transportation system for resin production Download PDFInfo
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- CN211643879U CN211643879U CN201921997638.1U CN201921997638U CN211643879U CN 211643879 U CN211643879 U CN 211643879U CN 201921997638 U CN201921997638 U CN 201921997638U CN 211643879 U CN211643879 U CN 211643879U
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Abstract
The utility model discloses a gas transportation system for resin production, include: the primary filtering device is used for realizing primary filtering of air; the conveying fan is connected with the output end of the primary filtering device through a first pipeline and used for conveying saturated air; the secondary filtering device is connected with the output end of the conveying fan through a second pipeline and is used for secondary filtering of the conveyed air; the humidifying device is connected with the first pipeline and is used for humidifying the primarily filtered air to form the saturated air; and the air-adding and water-adding device is used for adjusting the water quantity and the air quantity in the second pipeline so as to adjust the humidity of the supersaturated air. The utility model provides a conveying system has improved the air water content, provides the basis for follow-up resin production.
Description
Technical Field
The utility model belongs to the technical field of the transportation of air in the PVC resin production, concretely relates to gas transportation system for resin production.
Background
The PVC resin adopts a fluidized bed drying process technology, and the conveying process flow comprises the following steps: air from the atmosphere is filtered and cooled by a coarse filter, a conveying fan, a conveying cooler and a conveying filter, and qualified PVC resin from the fluidized bed drying is conveyed to a finished product resin bin through a blanking device.
Referring to the attached drawing 1, in the prior art, air a from the atmosphere is roughly filtered by a rough filter 1 to remove impurities such as dust particles and the like, and in addition, the temperature of the air is raised after passing through a conveying fan 2, so that a conveying cooler 3 is added behind the conveying fan 2 to cool the air and maintain the temperature of the air at 30-40 ℃, in order to ensure that new impurity particles cannot be introduced into the product PVC resin, the air conveyed by the conveying fan 2 and the conveying cooler 3 needs to be further purified and decontaminated by a conveying filter 4 and then directly contacts with the PVC resin product, and finally the PVC resin is conveyed to a finished product resin bin B.
The conveying system has the advantages that the conveyed atmosphere has low water content, and further, in the production of PVC resin, the water content is low, the static electricity is large, and the conveying is not facilitated. Influence factors of the water content of the PVC resin:
(1) impact on downstream customers
Most of volatile matters in the PVC resin are water, and the water can influence the sieving rate of the PVC resin and the quality of products. When the volatile matter is too much, bubbles are easily generated during molding to affect the product quality, and the surface is rough and even the product is curled. The content of volatile matters is too low, static electricity is easy to generate, the fluidity of the resin is influenced, and certain trouble is caused to the kneading of mixed materials, and the content is preferably controlled to be 0.1-0.3 percent generally.
(2) Influence of economic efficiency
According to the current monthly production capacity of 8.0 ten thousand tons/month, the moisture content of the PVC resin of the current finished product is about 0.10 percent, if the moisture content of the PVC resin is increased to 0.15 to 0.20 percent, the yield of the PVC can be indirectly increased by 40 to 80 tons/month, the sale unit price of the PVC resin is calculated by 5000 yuan/ton, and the economic benefit of 20 to 40 ten thousand yuan/month can be directly created.
(3) Influence on the packaging process
Over-drying of the resin, too low of a moisture content, can result in electrostatic agglomeration of the resin, clogging of the vibrating screen, and impact on transportation and packaging.
(4) Impact on downstream customers
The size of the volatiles in the resin directly affects the efficiency of the molding process and the quality of the plastic product. When the water content exceeds 0.3%, the sieving is difficult, the fluidity of the resin is deteriorated, the coagulation is generated, and air bubbles are easily generated in the molding process, thereby affecting the quality of the PVC profile. And when the water content is too low, dust and static electricity are easy to generate in the processing process.
In the production of PVC resin raw materials, not only the water content of the product is controlled not to be too high, but also static electricity caused by too low water content is avoided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a through the water yield that changes in the gas, and then reduce the problem that later stage resin finished product water content is few or static.
In order to realize the technical effect, the utility model discloses a following technical scheme realizes.
A gas transport system for resin production comprising:
the primary filtering device is used for realizing primary filtering of air;
the conveying fan is connected with the output end of the primary filtering device through a first pipeline and used for conveying saturated air;
the secondary filtering device is connected with the output end of the conveying fan through a second pipeline and is used for secondary filtering of the conveyed air;
the humidifying device is connected with the first pipeline and is used for humidifying the primarily filtered air to form the saturated air;
and the air-adding and water-adding device is used for adjusting the water quantity and the air quantity in the second pipeline and further adjusting the humidity of the supersaturated air in the second pipeline.
Compared with the prior art, through increasing humidification device and air entrainment watering device, change the water content in the air twice, it is that dry air forms saturated air earlier, then forms the supersaturated air again, and then is the supersaturated air with the air of the resin mixture in the fluidized bed, and it can transmit moisture for the resin, improves its water content, avoids the production of static.
Further, the change of the water amount is slowly realized by two devices, compared with the direct formation of supersaturated air, the moisture in the air is in a supersaturated state by the centrifugal humidifier, but the moisture can be partially lost in the conveying process, and the air is humidified by the air-entrapping water-adding device before the air is contacted with the resin.
Among this technical scheme, through simply increasing the device, realized the change of gas water content among the whole conveying system, the flow is simple, can not introduce secondary pollution, has improved the economic benefits of enterprise on the one hand, and on the other hand has optimized PVC resin product quality and has ensured customer's user demand.
As a further improvement of the present invention, the air conditioner further comprises a preheating device, the preheating device is used for preheating the air after the primary filtration, and the preheating device is disposed between the primary filtration device and the humidifying device.
By initial preheating, the air temperature is raised and the amount of water it can hold is increased, resulting in a higher air saturation.
As a further improvement, the preheating device is a conveying heat exchanger, and the working temperature in the conveying heat exchanger is 20-30 ℃.
In order to avoid the influence on a rear conveying fan due to overhigh temperature, the temperature of the conveying heat exchanger is 20-30 ℃, and as the temperature is increased, the amount of water capable of being contained in the air is increased, and the saturation of the air is increased; too high an air temperature causes a reduction in the operation capacity of the delivery fan (an increase in the motor temperature) and, at the same time, an increase in the operation load of the delivery cooler. In addition, the air temperature for finally conveying the resin needs to be maintained at 20-30 ℃, and the product quality of the resin is reduced due to overhigh temperature.
As a further improvement of the utility model, the humidifying device is a centrifugal humidifier.
Compared with other humidifiers, the centrifugal humidifier is adopted, and in the technical scheme, water can be uniformly atomized into air by using the centrifugal humidifier, so that the water is in a saturated state.
As a further improvement of the utility model, the centrifugal humidifier is used for spraying fog drops with the particle size of 5-10 mu m into the first pipeline.
In this technical scheme, adopt the droplet, compare in the drop of water, its advantage lies in making its homodisperse in the air with water atomization vaporific liquid, and saturated humid air finally contacts and can not cause the resin to contain water inhomogeneous with the resin, and avoids having the caking phenomenon.
As a further improvement, the gas filling and water adding device comprises a water adding pipeline and a gas adding pipeline, wherein the water adding pipeline and the gas adding pipeline are respectively used for adding water and gas to the second pipeline.
Through the increase of aqueous vapor pipeline, from the root, avoided the later stage resin finished product too dry, problem that the water content is too little, simultaneously, the gas entrainment adds water again, can not cause the resin finished product too dry or too wet, and then avoids moisture content too much, and PVC resin moisture content exceedes 0.3% just can be difficult to sieve, and the mobility of resin will worsen, produces to condense and extremely easily produce the bubble in the forming process, influences the quality of PVC section bar. And when the water content is too low, dust and static electricity are easy to generate in the processing process.
As a further improvement, the water feeding pipeline comprises a water pipe parallel to the second pipeline, a plurality of water injection holes have been seted up on the second pipeline, it is a plurality of water branch, a plurality of to be equipped with on the water pipe the water branch communicates with each other with the second pipeline through the water injection hole respectively, and every the water branch is last all to be equipped with the water shower nozzle, the water spray direction of water shower nozzle sets up with the flow direction syntropy of air in the second pipeline.
As the utility model discloses a further modified air entrainment adds water installation, its purpose utilizes 0.5 ~ 0.6 MPa's air to act on 0.2 ~ 0.3 MPa's pure water in the nozzle and makes its atomizing, and vaporific and evenly dispersed is in the air.
Specifically, the water spray head is used for spraying pure water with the pressure of 0.2-0.3 MPa, the using pressure is low, the consumed energy consumption is low, and the preparation is easy. The pure water has certain pressure, is convenient for spout and dispersion to the air, if there is not pressure, then the dispersion degree is poor, if pressure is too big, then the water smoke dynamics is big, can cause the loss to equipment.
As a further improvement, the gas filling pipeline comprises a gas pipe parallel to the second pipeline, a plurality of gas injection holes have been seted up on the second pipeline, be equipped with a plurality of gas branches on the gas pipe, it is a plurality of the gas branch communicates with each other with the second pipeline through the gas injection hole respectively, and every all be equipped with the gas shower nozzle on the gas branch, the gas shower nozzle jet-propelled direction and the second pipeline in the flowing direction syntropy setting of air.
Specifically, the air nozzle is used for spraying 0.5-0.6 MPa of air, and the air nozzle is used for supplying air to common instruments in a factory, so that the use requirement can be met, and the air nozzle is easy to prepare and obtain.
As a further improvement of the utility model, the quantity of the gas shower nozzle is the same as the quantity of the water shower nozzle, and is a plurality of the gas shower nozzle is with a plurality of the water shower nozzle interval sets up, and interval quantity is one.
Furthermore, 0.5-0.6 MPa of air and 0.2-0.3 MPa of pure water of the air-entrapping and water-adding device are mixed in the spray heads, the pure water is atomized into water mist through the spray heads, the number of the spray heads is determined according to production load and air flow in a conveying pipeline, and the installation positions of the spray heads in the device are reserved with a distance of 0.05-0.06 m, so that the humidifying spray heads are ensured to mutually act on air for humidification and are not interfered.
As a further improvement of the utility model, the air branch delivery blower is arranged, and the water branch is arranged close to the secondary filtering device.
Drawings
FIG. 1 is a schematic flow diagram of a gas transportation system for resin production according to the prior art;
FIG. 2 is a schematic flow diagram of a gas transportation system for resin production according to the present invention;
fig. 3 is a schematic flow diagram of the gas and water adding device provided by the present invention;
in the figure:
A. atmospheric air; B. a finished product resin bin; C. fluidized bed resin; 1. a coarse filter; 2. a conveying fan; 3. a transport cooler; 4. a delivery filter; 5. a transfer feeder; 6. a primary filtration device; 7. a first pipeline; 8. a secondary filtration device; 9. a second pipeline; 10. a humidifying device; 11. a gas and water adding device; 111. a water adding pipeline; 112. a gas supply line; 12. a preheating device; 13. a water pipe; 14. a water injection hole; 15. water branch; 16. a water spray head; 17. an air tube; 18. a gas injection hole; 19. gas branching; 20. an air nozzle.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Example 1
Referring to fig. 2-3, the present invention provides a gas transportation system for resin production, comprising:
the primary filtering device 6 is used for realizing primary filtering of air;
the conveying fan 2 is connected with the output end of the primary filtering device 6 through a first pipeline 7, and the conveying fan 2 is used for conveying saturated air;
the secondary filtering device 8 is connected with the output end of the conveying fan 2 through a second pipeline 9, and the secondary filtering device 8 is used for secondary filtering of the conveyed air;
the humidifying device 10 is connected with the first pipeline 7, and the humidifying device 10 is used for humidifying the primarily filtered air to form the saturated air;
and the air and water adding device 11 is used for adjusting the water quantity and the air quantity of the second pipeline 9, and further adjusting the humidity of the supersaturated air in the second pipeline.
Compared with the prior art, through increasing humidification device and air entrainment watering device, change the water content in the air twice for dry air forms saturated air earlier, then forms the supersaturated air again, and then is the supersaturated air with the air of the resin mixture in the fluidized bed, and it can transmit moisture for the resin, improves its water content, avoids the production of static.
Further, the change of the water amount is slowly realized by two devices, compared with the direct formation of the supersaturated air, the moisture in the air is in a supersaturated state by the centrifugal humidifier, but the moisture can cause the loss of part of the moisture in the conveying process, so the air is humidified by the air-entrapping water-adding device before the air is contacted with the resin, and the supersaturated air with more moisture content than before is formed.
Among this technical scheme, through simply increasing the device, realized the change of gas water content among the whole conveying system, the flow is simple, can not introduce secondary pollution, has improved the economic benefits of enterprise on the one hand, and on the other hand has optimized PVC resin product quality and has ensured customer's user demand.
Example 2
Referring to fig. 2, in addition to embodiment 1, this embodiment further includes a preheating device 12, where the preheating device 12 is used for preheating the air after primary filtering, and the preheating device 12 is disposed between the primary filtering device 6 and the humidifying device 10.
By initial preheating, the air temperature is raised and the amount of water it can hold is increased, resulting in a higher air saturation.
Further, the preheating device 12 is a conveying heat exchanger, and the working temperature in the conveying heat exchanger is 20-30 ℃.
In order to avoid the influence on a rear conveying fan due to overhigh temperature, the temperature of the conveying heat exchanger is 20-30 ℃, and as the temperature is increased, the amount of water capable of being contained in the air is increased, and the saturation of the air is increased; too high an air temperature causes a reduction in the operation capacity of the delivery fan (an increase in the motor temperature) and, at the same time, an increase in the operation load of the delivery cooler. In addition, the air temperature for finally conveying the resin needs to be maintained at 20-30 ℃, and the product quality of the resin is reduced due to overhigh temperature.
Further, the humidifying device 10 is a centrifugal humidifier.
Compared with other humidifiers, the centrifugal humidifier can uniformly atomize water into air to be saturated in the embodiment. The water mist sprayed out of the centrifugal humidifier has certain centrifugal force, namely, the water mist moves in multiple directions and rotates, compared with other humidifiers, the water mist sprayed out of the centrifugal humidifier is upward or downward, the direction is single, the water mist can only be contacted with air in a certain direction, and air in other directions is difficult to contact with the water mist and form saturated air.
Further, the centrifugal humidifier is used for spraying fog drops with the particle size of 5-10 microns into the first pipeline.
In this technical scheme, adopt the fog drop, compare in the drop of water, its advantage lies in atomizing into vaporific liquid with water and make its homodisperse in the air, and saturated humid air finally contacts with the resin and can not cause the resin to contain water inhomogeneous, and has the caking phenomenon. When the particle diameter of the mist droplets is less than 5 μm, the mist droplets are difficult to form, the humidifier is required to be high, the cost is increased, and when the particle diameter is more than 10 μm, the mist droplets have a large mass and a larger centrifugal force, but the force is larger when the mist droplets are ejected, and a plurality of large mist droplets are ejected, which has a certain influence on the piping and the like.
Example 3
Referring to fig. 3, the present embodiment focuses on a gas and water adding device.
Specifically, the gas and water adding device 11 includes a water adding pipeline 111 and a gas adding pipeline 112, and the water adding pipeline 111 and the gas adding pipeline 112 are respectively used for adding water and adding gas to the second pipeline 9.
Through the increase of aqueous vapor pipeline, from the root, avoided the later stage resin finished product too dry, problem that the water content is too little, simultaneously, the gas entrainment adds water again, can not cause the resin finished product too dry or too wet, and then avoids moisture content too much, and PVC resin moisture content exceedes 0.3% just can be difficult to sieve, and the mobility of resin will worsen, produces to condense and extremely easily produce the bubble in the forming process, influences the quality of PVC section bar. And when the water content is too low, dust and static electricity are easy to generate in the processing process.
Furthermore, the water adding pipeline 11 comprises a water pipe 13 parallel to the second pipeline 9, the second pipeline 13 is provided with a plurality of water injection holes 14, the water pipe 13 is provided with a plurality of water branches 15, the water branches 15 are respectively communicated with the second pipeline 9 through the water injection holes 14, each water branch 15 is provided with a water spray head 16, and the water spray direction of the water spray heads 16 is arranged in the same direction as the flowing direction of the air in the second pipeline 9.
As a further improved air-entrapping and water-adding device of the utility model, the purpose is to utilize 0.5-0.6 MPa air to act on 0.2-0.3 MPa pure water in the nozzle to atomize and uniformly disperse the pure water in the air.
Specifically, the water spray head is used for spraying pure water with the pressure of 0.2-0.3 MPa, the using pressure is low, the consumed energy consumption is low, and the preparation is easy. The pure water has certain pressure, is convenient for spout and dispersion to the air, if there is not pressure, then the dispersion degree is poor, if pressure is too big, then the water smoke dynamics is big, can cause the loss to equipment. If the pressure is less than 0.2MPa, the movement force is small, the probability of mixing with multidirectional air is small, and if the pressure is too large, the pressure is more than 0.3MPa, pipelines are easy to damage, and the like.
Further, the air supply pipeline 112 includes an air pipe 17 parallel to the second pipeline 9, the second pipeline 9 is provided with a plurality of air injection holes 18, the air pipe is provided with a plurality of air branches 19, the plurality of air branches 19 are respectively communicated with the second pipeline 9 through the air injection holes 18, each air branch is provided with an air nozzle 20, and an air injection direction of the air nozzle 20 is arranged in the same direction as a flow direction of air in the second pipeline 9.
Specifically, the air nozzle is used for spraying 0.5-0.6 MPa of air, and the air nozzle is used for supplying air to common instruments in a factory, so that the use requirement can be met, and the air nozzle is easy to prepare and obtain.
Furthermore, the number of the air nozzles is the same as that of the water nozzles, the air nozzles and the water nozzles are arranged at intervals, and the number of the intervals is one.
Furthermore, 0.5-0.6 MPa of air and 0.2-0.3 MPa of pure water of the air-entrapping and water-adding device are mixed in the spray heads, the pure water is atomized into water mist through the spray heads, the number of the spray heads is determined according to production load and air flow in a conveying pipeline, and the installation positions of the spray heads in the device are reserved with a distance of 0.05-0.06 m, so that the humidifying spray heads are ensured to mutually act on air for humidification and are not interfered.
Further, the air branch delivery blower is arranged, and the water branch is arranged close to the secondary filtering device.
Further, still include the heat sink, the heat sink sets up in the second pipeline, and is close to the secondary filter equipment setting.
The working process of the gas transportation system in this embodiment is as follows:
(1) air from the atmosphere is filtered by a coarse filter to carry large dust particles in the air, the air is preheated or cooled by a conveying heat exchanger to maintain the temperature of the air at 20-30 ℃, and the air is humidified by a centrifugal humidifier, so that the humidification of the conveying air is realized, and the air humidity is improved.
(2) The centrifugal humidifier adopts a humidifier produced in the market, and comprises an atomizing cylinder and a rotating seat hinged with the lower part of the atomizing cylinder, wherein the rotating seat is fixed on a moving device, the moving device consists of a base, a fixed frame above the base, a fixed wheel at the front end of the base and a universal wheel at the rear end of the base, the rotating seat is fixed on the fixed frame through a connecting device, and the moving device is arranged below the humidifier and can enable the humidifier to move freely on the ground; the rotary seat is arranged, so that the humidifier can swing left and right, and the humidifying area is increased.
(3) The humidified saturated wet air passes through a conveying fan, a conveying cooler and a conveying filter, and the PVC resin from the fluidized bed is conveyed to a finished product PVC resin bin.
(4) In the actual operation process, the atomization and humidification of the air from the atmosphere mainly depend on a centrifugal humidifier to meet the process requirements, and in order to keep the static electricity and the moisture content of the PVC resin uniform and stable, a set of PVC resin static electricity removing device is added after the air passes through the centrifugal humidifier in the air conveying process.
(5) A plurality of super-large fluid spray heads are arranged in a conveying pipeline (a straight pipeline between a conveying fan and a conveying filter), a bent pipe connected with 0.2-0.3 MPa of pure water is led out from an inner cavity of each super-large fluid spray head to provide cold pure water for static elimination, meanwhile, a straight pipe connected with 0.5-0.6 MPa of air is led in parallel to provide static elimination jet energy, so that the spray heads uniformly jet fine mist water drops to be uniformly mixed in the air, and finally, the humidity of the air is maintained at 80% -90%, and static generated in the conveying process of PVC resin is eliminated. In the actual operation process, the moisture content of the finished PVC resin is maintained between 0.15 and 0.20 percent by adjusting the air humidity from the atmosphere.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A gas transportation system for resin production, comprising:
the primary filtering device is used for realizing primary filtering of air;
the conveying fan is connected with the output end of the primary filtering device through a first pipeline and used for conveying saturated air;
the secondary filtering device is connected with the output end of the conveying fan through a second pipeline and is used for secondary filtering of the conveyed air;
the humidifying device is connected with the first pipeline and is used for humidifying the primarily filtered air to form the saturated air;
and the air-adding and water-adding device is used for adjusting the water quantity and the air quantity in the second pipeline so as to adjust the humidity of the supersaturated air.
2. The gas transportation system for resin production according to claim 1, further comprising a preheating device for preheating the air after the primary filtration, and the preheating device is disposed between the primary filtration device and the humidifying device.
3. The gas transportation system for resin production according to claim 2, wherein the preheating device is a conveying heat exchanger, and the working temperature in the conveying heat exchanger is 20-30 ℃.
4. A gas transportation system for resin production as claimed in claim 1 wherein the humidification device is a centrifugal humidifier.
5. The gas transportation system for resin production according to claim 4, wherein the centrifugal humidifier is configured to spray the mist of 5 to 10 μm in diameter into the first pipe.
6. A gas transportation system for resin production as claimed in claim 1 wherein the gas and water adding means comprises a water adding line and a gas adding line for adding water and gas to the second line respectively.
7. The gas transportation system for resin production according to claim 6, wherein the water feeding pipeline comprises a water pipe parallel to the second pipeline, the second pipeline is provided with a plurality of water injection holes, the water pipe is provided with a plurality of water branches, the water branches are respectively communicated with the second pipeline through the water injection holes, each water branch is provided with a water nozzle, and the water spraying direction of the water nozzle is arranged in the same direction as the flowing direction of air in the second pipeline;
the water spray head is used for spraying pure water with the pressure of 0.2-0.3 MPa.
8. The gas transportation system for resin production as claimed in claim 7, wherein the gas supply pipeline comprises a gas pipe parallel to the second pipeline, the second pipeline is provided with a plurality of gas injection holes, the gas pipe is provided with a plurality of gas branches, the plurality of gas branches are respectively communicated with the second pipeline through the gas injection holes, each gas branch is provided with a gas nozzle, and the gas injection direction of the gas nozzle is arranged in the same direction as the flow direction of the air in the second pipeline.
9. A gas transportation system for resin production as claimed in claim 8, wherein the number of said gas jets is the same as the number of said water jets, and a number of said gas jets are spaced apart from a number of said water jets by one.
10. The gas transportation system for resin production of claim 9, wherein the gas branch is disposed adjacent to a delivery fan and the water branch is disposed adjacent to a secondary filtration device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115159123A (en) * | 2022-05-09 | 2022-10-11 | 江苏华窑光宇科技有限公司 | Pneumatic conveying method and equipment for light viscous castable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115159123A (en) * | 2022-05-09 | 2022-10-11 | 江苏华窑光宇科技有限公司 | Pneumatic conveying method and equipment for light viscous castable |
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