Urea granulating column with high yield

Abstract

The invention relates to a urea granulating column with high yield, comprising a column body and a distributor, as well as a squeezing disc that is arranged in the upper portion of the column body; ahollow shaft is arranged in the center of the squeezing disc; a plurality of horizontal center shafts are fixed evenly on the outer periphery of the hollow shaft, each horizontal hollow shaft is hinged to a squeezing roller in penetrating manner, and the bottom edges of each squeezing rollers are attached to the upper surface of the squeezing disc. The granulating blocking problem can be effectively solved by making use of squeezing granulation; each urea granule is squeezed to freely fall in an independent cooling tube; the urea granules are full and solid and have a stable falling trajectory; the urea granules never collide with and stick to other granules; column sticking to the granules is never caused, a water film on a film mesh spreads water so that contact area of the water with urea powder is enlarged, and dust collection effect is significant; the dissolved urea is easy to recycle; humidity in the column herein is unaffected and dust emission is reduced.

Description

technical field [0001] The invention relates to a urea prilling tower, in particular to a urea prilling tower with high yield. Background technique [0002] Urea is the solid fertilizer with the highest nitrogen content. The urea prilling tower is the key equipment for fertilizer production. In order to produce granular urea, the urea solution needs to be concentrated to 99.7%, and then sent to the top of the tower for granulation through the molten urea pump. Nozzle, the rotating granulation nozzle sprays downward from the top of the urea granulation tower in the form of small droplets falling, passing through the drop from the top of the urea granulation tower to the bottom of the urea granulation tower, contacting the rising countercurrent cold air, and after solidification During the cooling process, it falls into the bottom of the tower to form granular urea. Generally, the temperature of the discharged urea should not be higher than 50°C for bagging. The urea particles...

AI Technical Summary

Problems solved by technology

[0009] In view of this, the main purpose of the present invention is to provide a high-yield urea prilling tower. Through this technical solution, the urea nozzle is no longer used, and the extrusion granulation method is used to effectively solve the problem of granulation blockage. At the same time, the blocking method prevents the cohesion between two adjacent granules, so that the temperature of the molten urea is kept low, and the initial temperature when the urea granules fall is also low, which is conducive to cooling, and the granulated particles are full and firm. , the trajectory of urea particles is stable when they fall, and they will not collide with other particles or stick together, nor will they stick to the granulation tower. Urea dust can be recycled and used to reduce dust emissions.

Images