Special equipment for slow release fertilizer coating powder spraying

Abstract

The invention discloses a special spraying device for slow-release fertilizer coating. The device is characterized in that an internal warm-air tube (14) is arranged in an external warm-air tube (15), an inner end of the internal warm-air tube (14) is arranged in the external warm-air tube (15), an external end thereof is arranged on a baking zone; a discharge box (23) is communicated with a charging box (16) by an induced draught fan (18); and a concurrent heating fan (4) is communicated with a feed box (7). The internal warm-air tube directly transmits a great amount of heat energy providedby a hot blast stove to the baking zone. The rest hot air discharged from the hot blast stove enters a preheating zone from a circular passage between the internal warm-air tube and the external warm-air tube, and the hot air from a concurrent heating air tube and an air return tube also enters the preheating zone, which provides the preheating zone with an appropriate temperature environment. Materials absorb heat in the preheating zone, the hot air enters an coating zone after temperature drop; as the temperature is lower, fertilizer granules can not be dried rapidly after liquid spraying, good viscosity is kept on granule surfaces, which is beneficial to sticking powder and can prevent mutual adhesion of the granules and avoid hardening of finished products.

Description

technical field [0001] The invention relates to a special equipment used in a slow-release fertilizer production line, in particular, it is a special equipment for slow-release fertilizer coated powder spraying. Background technique [0002] In slow-release fertilizer production, fertilizer particles gradually move from the inlet to the outlet in a rotating channel. The fertilizer granules at the entrance are generally at room temperature and need to be preheated to 50-60°C in the front section of the channel, then coated with a slow-release agent, and finally spray a layer of anti-sticking powder on the surface of the coating material to prevent the particles from sticking to each other, and Dry at 70-80°C and discharge. [0003] Existing production equipment introduces the hot blast of the hot blast stove from the inlet of the passage, discharges from the outlet, and the temperature of the hot blast from the inlet to the outlet gradually decreases, and the main problem it...

AI Technical Summary

Problems solved by technology

The technical problem to be solved is to make the preheating zone, coating zone and drying zone have the temperature required by the process through the distribution of hot air pipelines, so as to improve the quality of coating powder spraying; and make full use of the heat of the hot blast stove to reduce Energy consumption

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