In the post-treatment process of pharmaceuticals, pesticides, explosives, dyes, pigments, and other fine chemical production processes, there are often unit operations such as filtration, washing, and drying. These unit operations are usually composed of unit equipment such as centrifugal filters, washing tanks, and dryers. It operates independently, and the equipment is transported through pipelines or other methods. Multiple units of equipment are connected into a system of large devices, long processes, low efficiency, and difficult to adjust the production process. For suspensions with high solid content, solids often stick to the wall and block the pipeline, making it difficult to carry out normal production. Open production is easy to deal with clogging problems, but it is difficult to meet the regulatory requirements for medicine, food, biological products, etc., and there are still potential safety hazards for flammable, explosive, toxic or highly toxic materials.
In order to overcome the problems and deficiencies in the combination of the above-mentioned unit equipment, and at the same time meet the transformation of the chemical industry to high-quality, high-value-added, multi-variety, and small-batch, Wuxi ZhangHua Machinery Co., Ltd. has carried out a lot of design and development work, and finally successfully developed it. The multi-functional cylinder-cone reaction filter dryer integrating filtration, washing and drying has successfully applied for a patent (patent number: ZL201721560677.6.), which has achieved a major improvement in the technical performance of the equipment, from structural design to application. Comply with the corresponding regulatory requirements of the pharmaceutical industry. The equipment has three main functions of filtering, washing and drying, and also has many functions such as reaction, extraction, crystallization, concentration, evaporation, mixing and crushing, which belongs to the improved multifunctional equipment.
Multifunctional cylinder cone reaction filter washing and drying machine working principle
The new filter washing and drying machine has a barrel-cone structure. There are heating jackets on the cylinder body and the lower cone body to heat or cool the materials. There are hollow shafts and variable-angle variable-lead hollow shafts inside the multi-function machine. The spiral stirring device stirs, stirs and lifts the material, and pushes out the material when discharging.
A conical filtering device with a relatively complex structure is installed in the lower cone, and a specially designed non-dead angle quick-opening discharge device or a non-dead angle pneumatic discharge ball valve is installed at the bottom of the equipment.
In the reaction stage, the reaction materials are added from the top, and the unique stirring structure can make the materials be stirred evenly in the machine, and the materials are heated or cooled simultaneously through the cylinder jacket, cone jacket, hollow shaft, and hollow spiral blade. Make the material fully react in the machine. In the filtration stage, the machine can filter and dry the material in the machine by pressurizing or vacuuming, and add washing liquid, so that the material can be automatically repulped and washed several times in the machine, and then pressed dry after meeting the washing requirements.
In the drying stage, the cylinder jacket, cone jacket, hollow shaft, and hollow ribbon heat the material at the same time and vacuumize the top, vacuum-tight and low-temperature drying of the material, and automatically seal and discharge the material after drying.
Multi-functional barrel-cone reaction filter washing and drying machine process flow
1. Stirring reaction
Add the material (solid-liquid, liquid-liquid or gas-liquid) that needs to be reacted from the feeding port on the top of the equipment, start the motor and reducer, and make the hollow shaft and the hollow ribbon rotate clockwise (looking down from the top). The unique stirring structure can make the materials fully stirred and fully reacted in the machine. If the materials are to be heated or cooled during the reaction, heat medium or refrigerant can be introduced into the cylinder and the cone jacket, as well as the hollow shaft and the hollow spiral belt.
The heating or cooling medium can be continuously circulated to complete the heating or cooling of the material to meet the process conditions required for the reaction.
2. Pressure filtration or vacuum filtration
After the reaction is over, open the outlet of the lower filtrate, pass compressed air or nitrogen gas into the equipment, and filter the reacted solid-liquid mixture under pressure until the materials in the machine are dried. Vacuum can also be drawn at the outlet of the filtrate to vacuum filter the material until the filtrate is drained.
When filtering, the hollow shaft and the hollow screw belt can be rotated clockwise (viewed from the top) to lift the material, and the hollow screw belt can limit the thickness of the filter cake layer when rotating, so that the material is in a thin filter cake Filter under layer conditions to increase the filtration rate. For materials that are easy to filter, it is not necessary to stir when filtering, and the materials are directly filtered to dryness.
3. Can be washed and filtered many times
After some materials are filtered, they need to be washed several times.
The reaction, filtration and drying multifunctional machine is an ideal equipment for repeated washing of materials. After the material is pressed dry in the machine, the washing liquid can be added to the top washing liquid inlet, and then the filter cake is evenly repulped through the stirring of the hollow shaft and the hollow ribbon, and the material is pressed dry after the repulping is evenly stirred. If washing once is not enough, it can be washed several times. At this time, the above steps can be repeated many times. The operation is very convenient and the labor intensity is extremely low.
Washing materials in the above method is called batch washing method. Since the material is pressed dry and then washed with washing liquid, although the valves are opened and closed a little more times during operation, less washing liquid is used. The machine can also continuously wash the materials, that is, continuously press the washing liquid with a pump or other methods, and use the pressure of the washing liquid to filter, while the hollow shaft and the hollow ribbon are continuously stirred, and the filtrate is continuously discharged from the filtrate outlet until Until the washing requirements are met, the filter cake is finally pressed dry.
This continuous washing method generally uses more washing liquid than intermittent washing, but it is more convenient to operate.
4. Vacuum drying and discharging
The filter cake that is filtered or washed, filtered and dried remains in the machine. At this time, the heat medium is passed into the cylinder jacket, cone jacket, hollow shaft, and hollow screw belt to heat the material. At the same time, the hollow shaft and hollow screw The belt still rotates in a clockwise direction (looking down from the top) to lift the material up and stir it fully, while vacuuming is carried out on the top of the equipment to make the material dry in a vacuum-tight manner inside the machine. Since the hollow shaft and the hollow ribbon are heated from the inside in addition to the jacket heating, and the drying is carried out under vacuum conditions, the drying efficiency is very high.
After drying, open the quick-open discharge port at the lower part of the equipment, and make the hollow shaft and hollow ribbon rotate counterclockwise (looking down from the top), and the dried materials in the machine will be automatically pushed to the discharge port. So far, the reaction, filtration, washing and drying processes of a batch of materials are completed.
Multi-functional barrel-cone reaction filter washing and drying machine performance advantages
From the actual operation and use of the barrel-cone multi-functional equipment to process various materials, it can be found that the barrel-cone continuous filter dryer has many advantages, the main performances are as follows:
1. One machine is multi-purpose, and can complete various operations such as reaction, extraction, filtration, repeated filtration, washing, and drying in one machine, and the finished product can be obtained directly.
2. The operation is flexible, and the operation cycle can be adjusted by adjusting the filter pressure difference, rotation speed, screw extrusion lead, etc., so as to adapt to the change of process conditions.
3. The machine can form a very thin filter cake on the surface of the filter medium or filter under the condition of no filter cake. The filtration rate per unit filtration area is very high, so the equipment is small and compact.
4. Fully enclosed system, the operating environment is quite good, especially suitable for dealing with toxic, flammable, explosive dangerous products and delicious food biological products and pharmaceuticals that do not allow pollution.
5. It can be concentrated and filtered. Especially when it is necessary to wash the material, the material can be concentrated first, washed thoroughly in the suspension state, and finally press-filtered, which can reduce the handling of the material, reduce waste, and do not need to be repulped during washing. The product quality is very high.
6. It can be used for three operations of reaction, filtration and drying, so that the functions of the three unit equipment can be completed on this one equipment, so that the equipment cost, floor area, labor intensity, energy consumption, etc. are greatly reduced.
7. The power consumption of this machine is low, and the extruded filter cake generally has lower water content than the flat three-in-one machine, and the operation is also convenient.
To sum up, the barrel-cone reaction filter dryer is a relatively advanced multi-functional filter equipment at present. Its unique advantages will surely be widely used in chemical industry, medicine, food, metallurgy, textile and other fields.
Technical Improvement of Multifunctional Cylindrical Cone Reaction Filtration Washing and Drying Machine
1. Improvement of the structure of the stirring ribbon
The stirring ribbon is the core component of the barrel-cone reaction filter dryer, and its structure and stirring effect directly affect the performance of the whole machine.
The stirring ribbon must ensure that the whole machine fully stirs various reaction materials such as liquid-liquid, liquid-solid or gas-liquid in the machine during the reaction stage, so as to ensure that they are fully reacted. During the filter washing stage, the stirring ribbon must ensure uniform stirring of various concentrations of slurry or filter cake. In the drying stage, the agitating ribbon must ensure that the filter cake is fully agitated until the dry powdery material.
Therefore, the stirring ribbon is required to be able to adapt to the stirring of various performance materials from liquid to slurry, from slurry to filter cake and from filter cake to dry powder. If the stirring ribbon is not well designed, there will be problems in one of the above links. Affect the performance of the whole machine.
For this reason, we have done a lot of research work on important aspects such as the cone angle, lead, ribbon width, strength, and support rod angle, direction, and strength of the stirring ribbon, and finally obtained quite good results. The main performance In the following aspects:
① The axial lifting movement of the mixing ribbon to the material
We have carried out key research and improvement on the lead and width of the stirring ribbon, so that the material is lifted from the lower part upward along the barrel-conical shell wall when it is stirred, and after being lifted to the upper part, the angle of the upper ribbon changes to make the material It is unloaded into the central part, then falls from the central part to the bottom of the lower cone, and is lifted up from the bottom of the cone along the shell wall, so that the material circulates continuously and continuously generates a large flow of axial movement in the machine.
② Stirring ribbon device makes the material move radially
The stirring ribbon is connected to the stirring shaft through many supporting beams. We design these supporting beams like the impellers of centrifugal pumps, so that they can generate centrifugal force on the materials during stirring, so that the materials in the center will continuously flow to the equipment shell. place (side
Edge) movement, and the material moving to the edge of the equipment is lifted up by the screw belt for axial circulation.
③ Circumferential stirring movement of the material by the stirring ribbon device
In addition to making the material move radially and axially, the stirring ribbon device is also designed to make the material move circularly along the circumference. Result of circumferential stirring action.
To sum up, the stirring movement of materials in the machine is actually a three-way compound movement of axial movement, radial movement and circumferential movement, and its stirring and mixing effect is excellent. We have used the above principle to manufacture a barrel-cone vertical mixer. When the machine is running at a higher speed (over 80r/min), the materials in the machine can be stirred until they are completely suspended and flying, which can solve the problem of double helix Mixing problems that cannot be solved by conventional mixers such as mixers, conical mixers, double-cone rotary mixers, and coulter mixers.
2. Internal heating of hollow shaft and hollow ribbon
Since the barrel-cone reaction filter dryer is equipped with a filter device in the cone part, although this part is still heated by the outer jacket, the heat transfer effect is relatively low.
In order to improve the thermal efficiency of the machine as a whole, we designed the hollow shaft and the hollow
The material is heated. When designing the hollow shaft and hollow ribbon heating structure, we focused on solving the following two problems:
First of all, ensure that the hollow ribbon has a large heat transfer area in the machine. Because the smaller the lead, the smaller the rise angle of the ribbon, the more turns from the bottom to the upper part, and the larger the heating area of the ribbon.
The lead of the screw belt should not be too small, otherwise the lead angle of the screw belt will be too small, and the material will easily accumulate on the upper surface of the screw belt, which will affect the mixing effect and discharge. The spiral belt has a large lead and a large rise angle, although it will not accumulate material, but the number of spiral belt turns is small, and the heat transfer area is small. In order to solve the above problems, we adopt the method of multi-head spiral tape, which is wound in the same direction by multi-head spiral tape, which not only solves the problem of lead and lift angle, but also solves the problem of heat transfer area.
Secondly, the circulation problem of the heat medium in the hollow shaft and the hollow spiral belt is solved. If the heat medium does not circulate well in the hollow shaft and the hollow spiral belt, the material will cool down soon, which will affect the normal operation process. To this end, we have done a lot of research work. While ensuring the continuous rotation of the hollow shaft and the hollow spiral belt, the heat medium enters from the top, and flows out from the top after passing through all the hollow shafts and hollow spiral ribbons. Ensure that the heat medium enters and exits from two channels separately, independent of each other, so that the heat medium can be fully circulated in the machine, and the drying efficiency is greatly improved.
3. Processing and manufacturing process of perforated mesh plate and filter sintered mesh without deformation or tearing
Although various manufacturers can use multi-layer sintered stencils as filter screens, the specific structure of the stencils is different. The filter plate used in the multi-functional cylinder-cone reaction filter washing and drying machine should be manufactured together with the filter screen and the filter plate as a whole according to certain technical requirements. Guarantee no deformation, no tearing, and no leakage of any material during operation.
Only the filter disc with mesh, plate and cone processed together can effectively adapt to the changes of cold and hot working conditions in the tank, and ensure that it will not be deformed under any circumstances. will bulge. Even if the material has a certain viscosity, the filter will not be deformed or torn when the paddle rotates.
4. Special mechanical seal rotary joint
In order to make the heat medium circulate well in the hollow shaft and the hollow spiral belt, we designed a special mechanical seal rotary joint on the top of the hollow shaft to ensure that the heat medium enters from the top and passes through all the hollow shafts and hollow spiral belts. Flow from another channel at the top.
5. Quick opening discharge valve without dead angle
In order to make the barrel-cone reaction, filtration and drying multi-functional machine run smoothly, the discharge is quick and convenient, and at the same time there is no dead angle, a quick-opening discharge valve with a special structure is designed. This kind of valve can not only support the hollow shaft, but also has no dead angle, which can ensure that the material is completely filtered when it is filtered, and all the materials can be dried when it is dried, and the material can be discharged smoothly at the same time. Since the whole valve is a quick opening mechanism, the discharging is very convenient.
Multi-functional barrel-cone reaction filter washing and drying machine application field
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