(2) Freezing materials such as food, pharmaceutical products, etc.
(3) Paste materials, such as activated sludge and filter cake filter cake.
(4) Powdery materials such as ammonium sulfate and resin powder.
(5) Bulk materials such as coke and ore.
(6) Rod-shaped materials such as wood.
(7) Short-fiber materials such as rayon.
(8) Irregularly shaped materials such as ceramics.
(9) Continuous flaky materials such as ribbon fabric, paper, and the like.
(10) Coatings of parts and equipment, such as coatings of mechanical products.
2, the physical and chemical properties of the material The physical and chemical properties of the material being dried are important factors in determining the type of drying medium, drying method and drying equipment. Therefore, the designer of the dryer should understand;
(1) The chemical nature of the material. Such as composition, heat sensitivity (softening point, melting point or decomposition point), material toxicity, flammability, oxidation and acidity (degree), frictional chargeability, water absorption and the like.
(2) Thermophysical properties of the material. Such as material moisture content, false density, true density, specific heat capacity, thermal conductivity and particle size and particle size distribution.
The concentration, viscosity and surface tension should also be known for the raw material liquid.
(3) Other properties, such as the adhesion of the paste-like material, thixotropy (ie, the transition of the material from a plastic state to a fluidity property in a vibrating field or under agitation conditions), These properties can be utilized when designing dryers and feeders.
3. The combination of material and moisture The combination of solid and moisture is various. It can be attached to the surface of the material, or it can be retained in the pores of the porous material, or it can be the crystal water contained in the material. It penetrates into the swelling water in the material cells. The method of combining materials with water is different, and the method of removal is not the same. For example, the moisture attached to the surface of the material and the moisture in the large capillary can be removed by drying; the chemically bound water does not belong to the drying range, and after drying, it remains in the material.
At present, the heat metering market commonly used heat table is divided into mechanical heat meter(mechanical energy meter) and ultrasonic heat meter(ultrasonic energy meter).Heat energy meter is suitable for measuring the heat exchange, known as the heat transfer fluid or liquid absorbing thermal energy conversion equipment, which consists of a flow sensor, temperature sensor and heat calculator three parts. Heat energy meter (thermal meter), also known as Heat Meters, heat energy calculator, both measure heating system for heat and also measure heat absorption cooling system.
Heat energy meter (heat meter) is used to measure and display the water flow through the heat exchange system release or absorb heat. Heat energy meter, is also known as energy meters. The heat energy meters are installed at the inlet pipe or outlet pipe to measure accurate metering and intelligent control of charges of the heat consumption. Its working principle is to install heat energy meters in the heat exchange system, when water flows through the system, according to the supply and return water flow temperature, from the data from the flow sensors and temperature sensor as well as the water flow time, the heat energy meter will calculate the released and absorbed energy through the calculator.
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