| After-sales Service: | Cheaper Spare Parts & Local Service |
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| Warranty: | One Year |
| Type: | Vacuum Drying Equipment |
| Application: | Powder |
| Operating Pressure: | Vacuum |
| Roller Number: | Single Drum |
| Customization: |
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| Double Conic Rotary Vacuum Dryer also named Rotary Conical Vacuum Dryer (RCVD) or Conical Dryer Blender(CDB) is a kind of multi-functional machine of mixing & vacuum drying, it is a batch type fully closed process equipment for solid-liquid separation, vacuum drying of powder, granular or fiber solid and low-temperature concentrating of reaction solution, which is widely used in chemical industry, fine chemical industry, foodstuffs industry and pharmaceutical process industry. The cleaness vessel is especially suitable applicating for material that easy to be oxidized, volatilized, heat sensitive & toxic, not permitted to destroy its crystal in drying process, and the solution should to be recovering. RCVD/CDB is a fully closed pressure vessel equipment. Its constructure mainly includes a stainless steel double-conical vessel, a heating/cooling jacket, a frame, driving system, sealing device, vacuum system, rotary joint, temperature and pressure measurement device, control device and etc. |
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| Capacity: | 100 to 5000 Liters |
| Loading Rate(V/V): | 50%±10% |
| Working/Designed Pressure: | Vessel: -0.098/-0.098 ~ 0.4Mpa Jacket: 0~0.3/0.4Mpa |
| Working/Designed Temperature: | Vessel: 20 ~130ºC/143ºC Max. Jacket: 20 ~150ºC/150ºC Max. |
| Working Medium: | Vessel: Wet Material(Powder/Granular/ Fiber) that suiltable for the vessel material Jacket: Hot water / Low Pressure Steam / Thermal Oil |
| Construction Material: | Vessel: Stainless steel SS304 or SS316L Jacket: Stainless steel SS304 Vacuum Hood: Stainless steel SS304 or SS316L Gasket: PTFE+Silicone |
| Swing Speed of Vessel: | 0~6rpm |
| Cone Angle of Vessel: | 135°(Standard) Or Against customized |
| Max. Leackage Rate of Gas: | 1330Pa·L/s |
| Drying Intensity: | ≥15 kg/(m3·h) |
| Inner Vessel Surface Roughness: | Ra≤0.8um |
| Noice with No-load Working Test: | ≤85db |
| Driving Device: | Flameproof Motor 3 phase/6 Pole +Warm Gear Reducer |
| Shaft Seal: | PTFE Packing Type Seal + Rotary Joint |
| Standard/Design Code: | JB/T 20013-2017 Or Against customized standard |
| Suitable materials in powder,granular or fiber state: | Heat-sensitive materials that should be drying at low temperature; Oxygen-sensitive with hazardous materials; Materials that requiring recovery of toxic solvents and gases; Materials that required with low residual volatile content; Materials that required mixed/blended sufficiently and evenly. |
| Inapplication materials and operating conditions: | In order to ensure the service life of the RCVD/CDB, the equipment can not be application with following material & operating conditions: Stainless steel corrodes rapidly in the presence of chloride ions, even more than ordinary mild steel. Therefore, there are requirements for the use environment of stainless steel, and it needs to be wiped frequently to remove dust and keep it clean and dry. Inhabit operating over designed pressure and temperature. Materials that easy to agglomerate during drying process |
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| After the wet materials are feed into the vessel of RCVD/CDB, close all the valves and lips on the vessel and then start the vacuum pump; heating the vessel body by jacket pass though the heating media(hot water /low pressure steam/ thermal oil); the heat is in contact with the wet material through the inner wall of the vessel body,moisture is evaporated from the wet material, then the vapor is pumped out by the vacuum pump through the vacuum exhaust pipe; since the vessel is in a vacuum and rotating state to make the material constantly turn up and down inside and outside, so speed up the drying speed of the wet material, improve the drying efficiency, and achieve the purpose of uniform drying of the material. | |
| Vacuum Drying - Vacuum drying (VD) has some distinctive characteristics such as higher drying rate, lower drying temperature, and oxygen-deficient processing environment. It is conceptually the ideal method for drying heat and/or oxygen sensitive materials due to the advantage of removing moisture at low temperatures and minimizing the possibility of oxidation reactions. During vacuum drying, high-energy mloisture molecules diffuse to the surface and evaporate due to low pressure. Due to the absence of air and bacteria, vacuum drying prevents oxidation and maintains the color, texture, and flavor of the dried products.Vacuum-drying is proposed to alleviate some disadvantages of hot-air-drying, such as surface hardening and dispersion. During vacuum drying, the rate of evaporation increases (at a fixed temperature) since the boiling point of moisture is reduced. Vacuum-drying consequently requires less drying time than conventional hot-air-drying and in most cases results in a higher quality dried product. Multifuctional - The RCVD/CDB performs a multitude of tasks including mixing/blending, vacuum drying, and recovery of solvents (should connected with condensing system) . High Applicability - The rotating speed of vessel can be flexibly adjusted through the frequency conversion flameproof motor and controller to adapt to the changes in the specific gravity and viscosity of material, and improve the efficiency of drying process. Configurability & Cleanliness - Pneumatic control feed/discharge valves, weighing system, CIP/MIP and SIP systems can be added to meet the requirements of GMP standard clean production and automatic control to reduce the cross contamination risk. |
| Material Characteristics: Viscosity of material - The viscosity of the material changes with its moisture content. The viscosity can make the material agglomerate into blocks and adhere to the vessel inner wall. After drying, it is easy to adhere to the inner wall of dust collector and pipe. Allowable temperature of material - The allowable temperature is the maximum temperature that the material can withstand. If the temperature is exceeded by heating, the potency of the material will change, material will decompose or change color. Bulk density of materials - The mass per unit volume of material is called bulk density. Because the material is a mixture of dry material and moisture content, dry material is often in granular, powdery or solid block state, the gap between the particles of dry material is different with the different moisture content. The bulk density of wet material will be change from drying process, so pay attention to the selection of dryer. Slip angle of material - The side materials will slide downward when the angle between the slope and the bottom increases to a certain angle during stacking granular or powdery state materials. This angle named slip angle of material, and related to material composition, moisture content, particle size and viscosity. The cone angle of RCVD/CDB should be refer to the slip angle of the material. Heating Temperature & Drying Speed: Heating temperature - It is necessary to select the appropriate temperature during drying according to the different characteristics of materials. Generally, the variable temperature drying method can be used. In the early stage of drying, the heating temperature is low, and then temperature is gradually increased to improve the drying rate. Drying speed - At the beginning of RCVD/CDB vacuumizing and heating, the drying speed of material is slow; When the material temperature is heated above the boiling point of water/solvent, the drying speed will suddenly speed up. The moisture of material is heated into vapor state under the corresponding pressure within the allowable temperature range, and the heat added is used for vaporization heat and various heat losses, at this time the temperature of the material remains unchanged. The vacuum system continuously discharges vaporized steam to keep the pressure difference between the material evaporation surface and the space to makes the drying continue; When the moisture content of the material is reduced to a certain value, the moisture evaporated from the material is reduced, the temperature of the material begins to rise under the condition of constant heating capacity, the pressure difference between the material evaporation surface and the space decreases, and the drying speed turns into the deceleration stage and gradually decreased to zero. Working Pressure of Vessel: Generally, the working pressure inner vessel of RCVD/CDB keeps -0.09 to -0.098Mpa; drying speed turns quickly during the vessel under low pressure,but too low will cause the cost of vacuum system increasing, and it is diseconomy. Swing Speed of Vessel: Theoretically, the drying speed is more quickly with the vessel of RCVD/CDB rotates more faster. However, in the earlier of vacuum drying process, it is easy to cause the wet materials to agglomerate with faster rotation speed of vessel. Therefore, during the earlier of drying process, the rotation speed of the vessel can be increased after the material surface is dry. In the later of drying process, the rotation speed of vessel should be reduced appropriately with the decrease of moisture content, the increase of rotation speed has little effect on the increase of drying speed at this time. Therefore, during the drying process, the staff should adjust the rotation speed of the vessel according to the drying conditions of the materials at any time. |
| Stainless steel corrodes rapidly in the presence of chloride ions, even more than ordinary mild steel. Therefore, there are requirements for the use environment of stainless steel, and it needs to be wiped frequently to remove dust and keep it clean and dry. |
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