Polyurethane film-coated urea tower type air-cooled cooling device and method

The tower-type air-cooled cooling device with zoned cooling and composite control solves the problem of controlling the cooling rate of polyurethane films, achieves film integrity and particle dispersion, improves product qualification rate and production capacity, and adapts to different working conditions.

CN122360052AActive Publication Date: 2026-07-10LIAONING LU TIAN FERTILIZER CO LTD
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Patent Information

Application Number
CN202610702449.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-21
Publication Date
2026-07-10
Estimated Expiration
2046-05-21

AI Technical Summary

Technical Problem

Existing cooling devices have difficulty controlling the cooling rate of polyurethane films simultaneously, making it difficult to suppress the contradictory failure modes of film cracking and particle adhesion. Furthermore, they have poor adaptability to material temperature fluctuations and environmental changes, affecting product qualification rate and production capacity.

Method used

The polyurethane-coated urea tower-type air-cooled cooling device is designed, which is divided into a slow cooling pre-cooling zone, a critical curing zone, and a strong cooling dispersion zone. The controller precisely adjusts the frequency of the air supply fan and the opening of the pulse valve to achieve segmented cooling rate control and disturbed airflow. Combined with feedforward and feedback control, it ensures the glassy curing of the film and particle dispersion.

Benefits of technology

Simultaneously suppressing membrane cracking and particle adhesion within the same device improves cooling efficiency and product consistency, reduces energy consumption, adapts to changes in operating conditions, and maintains consistent slow-release performance.

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Abstract

The invention discloses a polyurethane film-coated urea tower type air-cooled cooling device and method, and belongs to the technical field of slow and controlled release fertilizer processing. A tower body of the device is sequentially provided with a slow cooling and precooling area, a critical curing area and a forced cooling dispersion area from top to bottom, the device is further provided with three air supply fans, an exhaust fan, four pulse valves, a material flow detection device, a temperature sensor group and a controller, and the four pulse valves at the bottom of the forced cooling dispersion area are diagonally grouped along the circumference of the tower body. According to the method, the glass transition temperature and the critical cooling rate of the polyurethane film serve as the benchmark, target cooling rates of different proportions are set for three areas respectively, and a controller alternately controls pulse valves which are grouped diagonally according to a first on-off cycle and a second on-off cycle. And the working frequency of the air supply fan in each area is adjusted in a feedforward and feedback combined mode. Film cracking and particle adhesion are simultaneously inhibited in the same device, and the film integrity, the anti-adhesion dispersion effect and the slow release performance consistency are obviously improved compared with those of an existing process.
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