Enclosed fluidized bed coating machine and preparation method of water-based polymer coated fertilizer

Abstract

The invention discloses an enclosed fluidized bed coating machine and a preparation method of a water-based polymer coated fertilizer. A coating machine main tower is provided with an automatic feeding system and an intelligent control system; a coating solution spray gun is provided with a circulating water cooling system; the enclosed fluidized bed coating machine is characterized in that the enclosed fluidized bed coating machine is arranged in the totally-enclosed coating machine main tower and is provided with an air circulation system and a dehumidifier; the dehumidifier is a drying tower loaded with a large-grain drying agent, and is connected to the coating machine main tower by an induced draft fan and a heater of the air circulation system for realization of totally-enclosed air circulation. According to an optimization scheme, a cyclone cleaning system is arranged between the coating machine main tower and the drying tower, circulating air sent from the coating machine main tower is taken back to the drying tower by the cyclone cleaning system. The enclosed fluidized bed coating machine is energy saving and environmentally friendly, greatly reduces the labor consumption, improves the coating process repeatability, meets technical requirements of a large-scale coating industry, broadens the application scope of a coating material, and is more suitable for the preparation of a class of the water-based polymer coated fertilizer of the development direction in the prior art.

Description

technical field [0001] The invention belongs to the field of preparation of slow and controlled release fertilizers, and specifically relates to optimizing an ordinary open fluidized bed coating machine into a closed fluidized bed coating machine based on water-based polymer coated fertilizers, and utilizing this large A method for producing water-based polymer-coated fertilizer with a numerically controlled fluidized bed coating machine. Background technique [0002] Coated fertilizers can effectively improve nutrient utilization efficiency, save labor, and reduce environmental stress, and are widely used in horticultural plants and economic crops. The production and technology of coated fertilizers in my country are relatively lagging behind, and the research on high-efficiency and low-cost equipment is almost blank, which slows down the promotion process of coated fertilizers in the market. [0003] At present, there are mainly two types of drum coating machines and flui...

AI Technical Summary

Problems solved by technology

Second, the humidity of the air inlet of this type of equipment cannot be controlled. When the outside air humidity is high, the water in the water-based coating material cannot evaporate, resulting in coating failure

Especially for some humidity-sensitive traditional Chinese medicines or urea coatings, the excessive humidity of the incoming air will easily cause the fertilizer core to absorb moisture and melt, so the production method of Kantian production has become common.

Third, many coating materials such as acrylic emulsions are easy to solidify in the spray gun at high temperature, causing the spray gun to clog and the coating fails

It is difficult to meet the technical requirements of the reproducibility of the current coating process by manual operation and control

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