By C. M. van 't Land

ISBN-10: 0470131179

ISBN-13: 9780470131176

A accomplished method of determining and knowing drying gear for chemical and mechanical engineers an in depth reference of curiosity for engineers and effort experts operating within the technique box, Drying within the procedure investigates the present cutting-edge of modern day business drying practices, examines the criteria influencing drying's excessive expenditures in either apparatus and effort intake, and summarizes key components for maintaining drying operations less than finances and functioning at height potential thoroughly whereas respecting the surroundings. large insurance of dryer fundamentals in addition to crucial approaches about the collection of commercial dryers—such as the best way to assemble result of correct laboratory measurements, perform small-scale checks, and properly dimension equipment—help to notify readers on standards for producing scalable standards that enormously support purchasing decisions.Drying within the strategy undefined: Takes a pragmatic method of drying apparatus, from an writer with 4 a long time within the Describes a various array of drying apparatus (convective, like flash, spray, fluid-bed, and rotary; touch, like paddle and steam; radiation) from an engineer's standpoint offers quickly and prepared entry to drying applied sciences with references to extra targeted literature Treats drying within the context of the complete creation processTrue of all strategy amenities the place drying performs an enormous function, similar to these within the chemical, pharmaceutical, plastics, and nutrients industries, the acquisition of incorrect business drying apparatus can considerably have an effect on a manufacturer's financial base line. With the counsel provided during this ebook, engineers could be capable of hopefully opt for business drying apparatus that raises gains, runs successfully, and optimally matches their wishes.

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Example text

The humidity chart is discussed in this chapter. If, on convective drying with bone-dry air having an air-inlet temperature of 200◦ C, the air would leave at 45◦ C, there would be no driving force to extract bound water from the product to be dried. Thus, the air-outlet temperature will have to be higher than 45◦ C: for example, 65◦ C. If the calculation in the example would have been carried out for higher air-inlet temperatures, the air-outlet temperature would approach 100◦ C. 20. 1 Calculate the saturated water vapor pressure at 50◦ C.

6 WATER–MATERIAL INTERACTIONS Sorption Isotherms When a solid is exposed to a humid gas of constant temperature and humidity, it will either gain or lose moisture until equilibrium is reached. The equilibrium moisture content of the solid Xe (dry basis) is a function of the relative humidity of the gas, the temperature, and the nature of the the solid and the liquid. The variation of Xe with relative humidity is called a sorption isotherm. Often, the sorption isotherm does not coincide with the desorption isotherm, and the system is said to exhibit hysteresis.

2. 3. 4. 5. Water was to be evaporated. There was no need to change the particle size. 4 mm. The inorganic salt was not temperature-sensitive. Only surface moisture was to be removed. Space economy and the possibility of combining drying and vertical transport were additional aspects. The flash dryer was installed but was not successful, owing to the formation of a fine product mist from the equipment. Two reasons for this were suggested: (1) the high velocities in the flash dryer abrade the crystal, producing fine particles, and (2) the rapid evaporation of the surface moisture causes nucleation therein (the surface moisture being a saturated solution of salt in water).

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Drying in the Process Industry by C. M. van 't Land


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