In recent years, with the ever-declining price of silicon carbide, in order to reduce the production cost, silicon carbide enterprises must treat the silicon carbide waste mortar and recover polyethylene glycol from it. The waste is then hydrolyzed to increase the recovery of polyethylene glycol. , to reduce the amount of waste mortar hydrolysis, thereby reducing emissions. According to the dry hydrolysis method in silicon micropowder treatment, based on the comparison of the vacuum rake dryer and the sealed paddle dryer, the latter is used to dry the waste mortar to reduce the cost, reduce the pollution and improve the polyethylene II. Alcohol recovery.
The dryer is the core equipment of the waste mortar silicon micro powder processing process, and its safety and reliability determine the operation stability of the process. There are two types of drying methods in the silicon micronizing process: intermittently operated vacuum tumble dryers and continuously operated closed blade dryers.
Silica micropowder vacuum rake dryer works Principle rake dryer is a kettle of dry, belonging to intermittent operation, the process is discontinuous, about every 90min to repeat the process of feeding and unloading, frequent operation, resulting in labor intensity Large; and the volatile matter in the silicon powder is flammable, explosive and corrosive gas, affecting personal safety The helium dryer uses a limited volume to hold the silicon powder first, and then indirectly heats the steam to evaporate the volatiles in the silicon powder. . Due to the limited capacity of the rake dryer, the throughput cannot be increased. In terms of slag drying, six rake dryers are required for three production lines. The average value of the volumetric heat transfer coefficient of the rake dryer is approximately 2000 to 6000 kcal/(hm °C). The gas-solid two-phase contact time is very short. The drying time is generally 0.5 to 2.0 s and the longest is 5.0 s. The single batch material drying time About 3 to 4 hours, the initial thermal efficiency is about 80%. However, with the drying time of the slurry, the drying thermal efficiency shows a significant downward trend. Industrial applications found that the opportunity for one-time access of silicon micro-powder to drying at one time leads to extremely uneven drying of the material. The internal pressure of the dryer fluctuates and there is a hidden danger in the shaft-end seal during long-term operation. The polyethylene glycol vapor after the silicon micropowder is completely dried. Entrained with a large amount of dust, the front filter of the condenser will be frequently blocked, seriously affecting the continuous operation of the device; Once the evaporated powder enters into the subsequent hydrolysis tank, the working load of the hydrolysis tank will suddenly become larger, and the powder will enter the hydrolysis When the tank is in the tank, water vapor can easily enter the interior of the dryer.
The dryer recommended for the initial introduction of the silicon micropowder processing technology package is a rake dryer. The supplier is a foreign supplier. The purchase price of each rake dryer is expensive, the ordering cycle is long, and there is an inconvenient purchase of spare parts. Such factors, therefore, to a certain extent, impose constraints on the continuous and stable operation and economic efficiency of production equipment.
Silica micropowder sealed paddle dryer Operating principle Sealed paddle dryer has a continuous work process and the labor intensity of workers is low. As far as the slurry is dried, only one feeding and unloading process is required, and the operation is simple and the safety factor is high. Closed-type paddle dryer uses steam to indirectly heat, continuously volatilize continuous evaporation during the continuous addition of slurry to increase the volumetric utilization rate of closed paddle dryer, and increase the amount of processing. Three production lines require three rotary indirect dryers. For ease of operation, the volumetric heat transfer coefficient of one to two rotary indirect dryers can be used. The gas-solid two-phase contact and drying time are almost the same as those of a rake dryer. , Continuous batch drying time is generally about l0 ~ 15min, thermal efficiency is stable at about 80%.
Silica micropowder sealed paddle dryer evenly disperses the material to the unit time, the material enters into the dryer at a uniform rate, the feeding amount per unit time is small, and all the operating parameters of the dryer are relatively stable; the dryer dries the product In the form of a paste, pure chlorosilane vapor is evaporated, and the probability of blockage of the filter at the front of the condenser is drastically reduced; the evaporated paste is continuously and uniformly conveyed to the subsequent hydrolysis tank by the screw pump, and the material after drying is dried. The volume and weight are significantly reduced, and less material is dispersed into the unit of time. Therefore, the hydrolysis tank works extremely smoothly, and the screw pump has better sealing performance. The water vapor in the hydrolysis tank cannot enter the interior of the dryer.
Through the above comparison, it is advisable to select a closed-type paddle dryer that operates continuously in the design of the silicon carbide waste mortar treatment process.
Silica powder paddle dryer equipment structure The silicon powder paddle dryer shell consists of the inner wall of the equipment and the outer jacket. The jacket is designed to be honeycomb, that is, the inner surface of the jacket wall is flushed with many flanges inward. Concave hole, flange and inner wall are welded to increase strength. The dryer shell is designed as an integral structure. There are manholes and sight glass at the top, which not only facilitates observation and maintenance, but also avoids the leakage of ordinary blade long and narrow sealing surface. As a result of the oxidation reaction, the top dome structure design enhances the overall strength of the device.
Hollow hot shaft and hollow blade structure are the key components of the slurry indirect rotary dryer. The polysilicon slurry paddle dryer has two hollow hot shafts. The two shafts rotate in the opposite direction. They are all in the direction of the centerline of the equipment. With the aid of the auxiliary platen on the blade, the material is pushed from the center to the wall surface, and the material is lifted from the wall surface. Lift up, cross the hollow hot shaft, and squeeze it into the center of the equipment. For materials with strong abrasive properties, there is no steam in the blades and wear-resistant accessories are required.
Silicon micropowder dryer is an indirect heating continuous dryer, which has small continuous feed flow, short residence time, high heat transfer efficiency and low investment. It is suitable for paste-like, pasty or agglomerated materials with strong adhesion and easy oxidation. Decompose the drying of flammable and explosive materials. Polysilicon slurry paddle dryer can effectively control the consumption of drying medium and heat transfer medium, increase the recovery rate of polyethylene glycol, and reduce environmental pollution at the same time, to a certain extent, meet the silicon carbide waste mortar slurry silicon micro-powder treatment requirements.
The dryer is the core equipment of the waste mortar silicon micro powder processing process, and its safety and reliability determine the operation stability of the process. There are two types of drying methods in the silicon micronizing process: intermittently operated vacuum tumble dryers and continuously operated closed blade dryers.
Silica micropowder vacuum rake dryer works Principle rake dryer is a kettle of dry, belonging to intermittent operation, the process is discontinuous, about every 90min to repeat the process of feeding and unloading, frequent operation, resulting in labor intensity Large; and the volatile matter in the silicon powder is flammable, explosive and corrosive gas, affecting personal safety The helium dryer uses a limited volume to hold the silicon powder first, and then indirectly heats the steam to evaporate the volatiles in the silicon powder. . Due to the limited capacity of the rake dryer, the throughput cannot be increased. In terms of slag drying, six rake dryers are required for three production lines. The average value of the volumetric heat transfer coefficient of the rake dryer is approximately 2000 to 6000 kcal/(hm °C). The gas-solid two-phase contact time is very short. The drying time is generally 0.5 to 2.0 s and the longest is 5.0 s. The single batch material drying time About 3 to 4 hours, the initial thermal efficiency is about 80%. However, with the drying time of the slurry, the drying thermal efficiency shows a significant downward trend. Industrial applications found that the opportunity for one-time access of silicon micro-powder to drying at one time leads to extremely uneven drying of the material. The internal pressure of the dryer fluctuates and there is a hidden danger in the shaft-end seal during long-term operation. The polyethylene glycol vapor after the silicon micropowder is completely dried. Entrained with a large amount of dust, the front filter of the condenser will be frequently blocked, seriously affecting the continuous operation of the device; Once the evaporated powder enters into the subsequent hydrolysis tank, the working load of the hydrolysis tank will suddenly become larger, and the powder will enter the hydrolysis When the tank is in the tank, water vapor can easily enter the interior of the dryer.
The dryer recommended for the initial introduction of the silicon micropowder processing technology package is a rake dryer. The supplier is a foreign supplier. The purchase price of each rake dryer is expensive, the ordering cycle is long, and there is an inconvenient purchase of spare parts. Such factors, therefore, to a certain extent, impose constraints on the continuous and stable operation and economic efficiency of production equipment.
Silica micropowder sealed paddle dryer Operating principle Sealed paddle dryer has a continuous work process and the labor intensity of workers is low. As far as the slurry is dried, only one feeding and unloading process is required, and the operation is simple and the safety factor is high. Closed-type paddle dryer uses steam to indirectly heat, continuously volatilize continuous evaporation during the continuous addition of slurry to increase the volumetric utilization rate of closed paddle dryer, and increase the amount of processing. Three production lines require three rotary indirect dryers. For ease of operation, the volumetric heat transfer coefficient of one to two rotary indirect dryers can be used. The gas-solid two-phase contact and drying time are almost the same as those of a rake dryer. , Continuous batch drying time is generally about l0 ~ 15min, thermal efficiency is stable at about 80%.
Silica micropowder sealed paddle dryer evenly disperses the material to the unit time, the material enters into the dryer at a uniform rate, the feeding amount per unit time is small, and all the operating parameters of the dryer are relatively stable; the dryer dries the product In the form of a paste, pure chlorosilane vapor is evaporated, and the probability of blockage of the filter at the front of the condenser is drastically reduced; the evaporated paste is continuously and uniformly conveyed to the subsequent hydrolysis tank by the screw pump, and the material after drying is dried. The volume and weight are significantly reduced, and less material is dispersed into the unit of time. Therefore, the hydrolysis tank works extremely smoothly, and the screw pump has better sealing performance. The water vapor in the hydrolysis tank cannot enter the interior of the dryer.
Through the above comparison, it is advisable to select a closed-type paddle dryer that operates continuously in the design of the silicon carbide waste mortar treatment process.
Silica powder paddle dryer equipment structure The silicon powder paddle dryer shell consists of the inner wall of the equipment and the outer jacket. The jacket is designed to be honeycomb, that is, the inner surface of the jacket wall is flushed with many flanges inward. Concave hole, flange and inner wall are welded to increase strength. The dryer shell is designed as an integral structure. There are manholes and sight glass at the top, which not only facilitates observation and maintenance, but also avoids the leakage of ordinary blade long and narrow sealing surface. As a result of the oxidation reaction, the top dome structure design enhances the overall strength of the device.
Hollow hot shaft and hollow blade structure are the key components of the slurry indirect rotary dryer. The polysilicon slurry paddle dryer has two hollow hot shafts. The two shafts rotate in the opposite direction. They are all in the direction of the centerline of the equipment. With the aid of the auxiliary platen on the blade, the material is pushed from the center to the wall surface, and the material is lifted from the wall surface. Lift up, cross the hollow hot shaft, and squeeze it into the center of the equipment. For materials with strong abrasive properties, there is no steam in the blades and wear-resistant accessories are required.
Silicon micropowder dryer is an indirect heating continuous dryer, which has small continuous feed flow, short residence time, high heat transfer efficiency and low investment. It is suitable for paste-like, pasty or agglomerated materials with strong adhesion and easy oxidation. Decompose the drying of flammable and explosive materials. Polysilicon slurry paddle dryer can effectively control the consumption of drying medium and heat transfer medium, increase the recovery rate of polyethylene glycol, and reduce environmental pollution at the same time, to a certain extent, meet the silicon carbide waste mortar slurry silicon micro-powder treatment requirements.
Knifeless Tape Does not hurt the paint
1.When used in combination with vehicle wrap films, Cutting Tape enables installers to create imaginative, one-of-a-kind works of art on vehicles
2.It will not cause any damage to the car paint during use.Applications:It is mainly suitable for the surface design of automobiles that can be adjusted in various directions.it can let you finish vehicle graphic installations without a blade.it's designed to protect your vehicle surface from blade damage, which is a Self-adhesive tape for cutting films in business or industrial use.easy to use:it is as sharp as the blade. Patented design stretches slightly and turns easily in any direction for one-of-a-kind works of art. Tape can be broken with hands for faster.Easily cuts most vinyl wrap films.
- Replaces knife cutting during installation
- Easily cuts most vinyl wrap films
- Designed to protect the substrate from blade damage
- Easy to turn in any direction to follow contours and curves
- Easily create highly contoured designs and leave a sharp, clean edge
- For single layer vinyl applications
Knifeless Tape,Cutting Knifeless Tape,Film Cutting Line,Wrapping Knifeless Tape
Guangzhou Fuyulai Technology Co.,Ltd , https://www.fylfilm.com