Impinging stream drying combinations

To solve the problem that the residence time of material in a simple impinging stream device is very short so that drying cannot be carried out individually, in addition to the improvements described above, some technological schemes have been proposed which combine the method of impinging streams with other method some of these are introduced below. 

The dry-based capacity of the equipment is 1.78 kg s-1, while the recovery efficiency of the particles is 98-99%. It is reported that the conditions of fluid dynamics are very stable and that the equipment can be operated with a very high concentration of dense phase. It is clear that at least one of the researchers major intentions in the design of the dryer is to lengthen the residence time of the particles. 

2 Drying of sewage with high moisture content 

Obviously, the device shown in Fig. 6.12 is not suitable for industrial production on a large scale because of its batch operation. 

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FIGURE 28.18 A combined ISD-PD system for paddy. (1) Blowers (2) flow control valves (3) heaters (4) impinging stream dryer (5) paddy feeding device (6) pneumatic dryer (7) cyclone separators. (From Nimmol, C. and Sathapornprasath, K., Drying TechnoL, 30, 1854, 2012.)... 

Juai XL, Liu DY, Li CZ, Meng Q. The investigation of combined impinging stream dryer of vertical and sloped semi-circle. Proc. 12 Inti. Drying Symposium (IDS 2000). Coumans WJ, Kerkhof PJAM, eds. Noordwijkerhout, The Netherlands, Paper No 104, 2000. 

In general, plants using SO2 gas derived from metallic sulfides, spent acids, or gypsum anhydrite purify the gas stream before drying it by cold, ie, wet, gas purification. Various equipment combinations including humidification towers, reverse jet scmbbers, packed gas cooling towers, impingement tray columns and electrostatic precipitators are used to clean the gas. 

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