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Future development of Mini spray dryers

Mini spray dryers future development will be in-depth study of the dryer drying mechanism and material drying characteristics, mastery of the optimal operating conditions of different materials, the development and improvement of the dryer; In addition, large-scale, high-intensity, high economy, as well as improvements to raw materials adaptability and product quality is the basic trend of development of the dryer; and further research and development of new efficient and meet the special requirements of the dryer, such as freeze dryer manufacturers , microwave dryers and far infrared dryers and the like.

But also attach importance to the development of the dryer energy saving and comprehensive utilization, such as the use of various joint heating, heat pumps and heat pipe technology transplant, the development of solar dryers and the like; but also the development of the dryer automatic control technology, in order to ensure optimum operating conditions achieve; in addition, with the human importance of environmental protection, environmental protection measures to improve the dryer to reduce dust and gas leakage, will also be studied in depth direction.

the features of Photochemical reactor

Photochemical reactor is relatively old, inside the heated plate divided into several layers. Heating plate was passed through hot water or low pressure steam as the heating medium, the spread of drugs to be dried on a hot plate tray, close the door, inside the evacuated using a vacuum pump. Heating plate in the heating medium circulating in the drug is heated to a specified temperature, the water began to evaporate and gradually pumped with vacuum. This device is easy to control, condensate recovery solvent is evaporated, the drying process can not easily be contaminated drugs can be used in Laboratory reactors , sterilizing the packaging material and heat treatment. In the 1980s API industry multi-use this device as the main dryer, but not easy to reel line cleaning and

sterilization line, slow drying, high labor intensity, but also to achieve uniformity of the drug, even after drying after mixing apparatus for mixing powder, bulk drugs now on the large-scale production has been rarely used, used in small scale production or packaging materials heat treatment.

The classification of Laboratory scale spray dryers

Glass reactors operation according to different characteristics, operating pressure, heating the wet material movement pattern or structure classification. Following the procedure, the dryer is divided into (batch operation) types of batch and continuous
Press the operating pressure, the dryer is divided into two types of pressure dryer and vacuum dryer, operating in a vacuum space can be reduced partial wet steam partial pressure to accelerate the drying process, and can reduce boiling point and material moisture drying temperature, steam is not easy leakage, so a vacuum Laboratory scale spray dryers is suitable for drying heat-sensitive, easily oxidized, explosive and toxic materials need to be recycled and moisture vapor occasions

By heating, convection dryer into, conduction, radiation type, dielectric type and other types. Also known as convection dryer direct dryers, the drying medium is in direct contact with the wet material using heat to convection heat transfer, and the resulting steam away; also known as indirect conduction drier dryer, which uses conduction way to transfer heat from the heat source to the wet material through a metal partition, the resulting steam is available vacuum suction moisture, which leads to a small amount of purge gas or cryogenic condenser surface condensation methods such as separately provided removed. Do not use this type of dryer the drying medium, high thermal efficiency, the product is not contaminated, but the drying capacity limit heat transfer area by the metal wall, the structure is also more complex, often operating under vacuum; radiation dryer is the use of various radiation It emits a certain wavelength range of electromagnetic waves, the surface after being wet material is selectively absorbed into heat for drying; dielectric dryer is the use of a high-frequency electric field, so that the internal thermal effect wet material was dried.
By movement of the wet material, the dryer can be divided into a fixed bed, agitated, spray and modular; according to the structure, the dryer can be divided into Van dryers, conveyor dryers, drum dryers, Li dryers, mechanical agitation dryers, rotary dryers, fluid bed dryers, gas stream type dryers, vibration dryers, spray dryers and other dryer and combined.
For drying wet materials equipment. Subject to various production processes dried material is varied, the drying requirements also vary, therefore drier variety, according to the heating mode, the following four categories: 1 convection dryer
The most widely used class dryer, including a fluidized dryer, air dryer, Van dryer, spray dryer, a tunnel dryer and the like. The main features of these dryers are: ① direct contact with the hot gas and solid heat in the convective heat transfer from the hot gas circulating manner to wet the solid, water vapor generated by the airflow away; ② hot air temperature can be increased to ordinary metal materials The maximum temperature (about 730 ℃) can be tolerated at a high temperature radiant heat transfer will be the main mode of heat transfer, and can reach very high heat utilization; ③ airflow humidity final moisture content of the drying rate and product have influence; ④ When using a low temperature airflow, usually need to first make the dehumidification process gas stream; ⑤ vaporization energy per unit mass than the conduction dryer moisture is high, the final product moisture content is low even worse; ⑥ need a lot of hot air in order to guarantee the heat of vaporization of water required, if the particle size of the material to be dried is small, the dust and the huge cost means higher; ⑦ should be operating at near ambient conditions. 2 conduction dryer
Including screw conveyor dryers, drum dryers, vacuum rake dryer, freeze dryer, the main characteristics of this type of dryers are: ① heat through the wall (usually metallic wall), to pass the wet heat conduction material ; ② the surface temperature of the material from below freezing (freeze-drying time) to 330 ℃; ③ easy to operate under a reduced pressure and an inert atmosphere, volatile solvent recoverable. Commonly used in easily oxidized, easy to break down dry materials, also applies to the handling of powdered materials. 3 radiation dryer
Heat transfer by radiation, heating the wet material to dry. Electric heating by infrared radiation dryer light bulbs dry material, the material temperature and dry. Gas heating combustion gas dryer is a metal or ceramic radiant panel is heated to 400 ~ 500 ℃, thus producing infrared, for heating the material to be dried. Radiation dryer production strength, compact device, the use of flexible, but consume more energy. Suitable for drying large surface and thin materials, such as plastic, cloth, wood, paint products

The applications of Gas Liquid Solid phase photochemical reactor

Gas Liquid Solid phase photochemical reactor process requires large amounts of energy, in order to save energy, certain high moisture content of the material, containing suspended solids or solution is generally first by mechanical dewatering or heating evaporation, and then dried in a dryer to obtain dry solids.
The dried material is designed to use or further processing needs. Such as the production of wood Rotary evaporator manufacturers wood molding, wood products can prevent the deformation front, ceramic blanks in the dry before calcination finished cracking can be prevented. In addition the material after drying is also easy to transport and storage, as the harvested grain is dried to a certain moisture content or less, to prevent mildew. Due to dry naturally can not meet the needs of production development, all kinds of mechanized dryers more widely applied.
During the drying process it needs to complete the heat and mass (moisture) transfer, ensure the material surface moisture vapor partial pressure (concentration) is higher than the external space moisture vapor partial pressure, to ensure that the heat source temperature is higher than the temperature of the material.
Heat from the heat source in a variety of ways to transfer wet material, so that the material surface moisture vaporize and escape into outer space, so that the difference between the moisture content of the material appear in the surface and interior. Internal moisture diffusion and vaporization to the surface, continue to reduce the moisture content of the material,
The gradual completion of the whole dried material.
The drying rate depends on the material surface diffusion rate and the internal rate of vaporization of moisture. The drying rate is usually dried by early vaporization rate control surface; then, as long as the external conditions remain unchanged drying, drying rate of materials and surface temperature is stable, this stage is called constant drying stage; when the moisture content of the material is reduced to a degree, reduce internal moisture diffusion rate to the surface, and the surface is less than the vaporization rate, drying rate that is mainly determined by the internal diffusion rate, and with lower moisture content and continue to reduce, at this stage called the falling rate drying stage.

Modern Laboratory spray dryers manufacturers

Laboratory spray dryers manufacturers started using the intermittent operation of a fixed bed dryer. The mid-19th century, Tung Road, dryer usage, marked by the intermittent operation of the dryer to the direction of the development of continuous operation. Rotary drum Laboratory freeze dryers is better achieved stir particulate material, drying ability and strength can be improved. Some industries, respectively development of the industry to adapt to the requirements of continuous operation dryers, such as textiles, paper industry drum dryer.
Early 20th century, dairy production began to use a spray dryer, to provide a powerful tool for large-scale drying liquid materials. Start the 1940s, with the development of streaming technology, high-strength, high productivity and air-fluidized bed dryer has emerged. Sublimation and freezing, radiation and dielectric dryer was provided to meet the special requirements of a new tool. 1960s began to develop a far-infrared and microwave dryer.