Dithane M-22 Z-78 closed loop circulating drying method and apparatus

Abstract

Drying methods of mancozeb closed cycle, the mancozeb was sent into the dryer, take heat and mass exchange with 140 degree C to 250 degree C nitrogen gas or carbon dioxide, separate in the cyclone separator and bag filter, dry goods was sent into cooler and unloaded after cooled to room temperature, the off-gas heat was recycled by recoverer, sent to the heater. Its installations comprises the dryer, cyclone separator, waste heat recoverer, the fan, spraying tower, heater and dry goods cooler, the air outlet was connected with the air inlet of the cyclone separator, its air outlet was connected with the hot end air inlet of the waste heat recoverer, the hot end air outlet was sequentially connected with spraying tower, demister and fan, the air outlet of the fan connects the cold end air inlet of the waste heat recoverer, the cold end air outlet of the waste heat recoverer connects the air inlet of dryer by the heater, the discharging mouth of cyclone separator links the dry goods cooler, which has discharge gate on it, the heater was set with heat medium inlet and outlet, the spraying tower was set with cooling water inlet and water outlet down, the bottom of the demister was also set with water outlet.

Description

technical field [0001] The invention relates to a mancozeb drying method and equipment, in particular to a closed-circuit circulation drying method and a drying device for mancozeb using nitrogen or carbon dioxide as a circulating drying medium. Background technique [0002] The original drug of mancozeb is easily decomposed and oxidized when exposed to air and moisture, and even burns and explodes. Moreover, it also contains some weak crystal water, which makes it more difficult to dry. [0003] At present, mancozeb manufacturers generally use vacuum double-cone drying. When drying, manually send wet materials into the dryer, close the inlet and outlet, use the water suction vacuum pump to extract the air in the dryer, reach a certain negative pressure, open the steam valve, and the steam enters the jacket of the dryer In the process, the material is indirectly heated and dried. After a period of time, the moisture content of the dry product is...

AI Technical Summary

Problems solved by technology

However, the total drying time from feeding to unloading is about 4 hours, and a 1.5m 3 The vacuum double-cone dryer dries about 210kg of wet material each time, and the hourly output of a single unit is extremely low at about 50kg / h. To achieve a certain production scale, a large number of equipment is required and the floor area is large.

The drying is an intermittent operation, the heating and cooling in the dryer are carried out alternately, the power and heat energy consumption is high, and the thermal efficiency is extremely low

Feeding and discharging are carried out manually, the operating environment is poor, the labor intensity is high, and the material dissipation is also large

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