Based on the working principle and process characteristics of drum spray granulation, liquid sulfur and cooling water are pumped through pipelines to the drum granulator, and sprayed out in an atomized state from several nozzles distributed along the axial direction of the drum. Atomized sulfur freeze and become seed, then coated with sprayed sulfur, seeds become bigger and bigger with rotary of drum, resulting in the formation of gradually increasing spherical particles; Atomized cooling water allows particles sprayed with liquid materials to quickly cool and solidify. The injected cooling water is converted into water vapor by the sensible heat and latent heat of solidification of the material, and sucked out by an draught fan after being de-dust.

The process include: regulation and control of material status (mainly liquid sulfur temperature), transmission of liquid sulfur, transmission of cooling water, screening and return circulation, tail gas de-dust treatment and discharge, and unit automatic operation control system, sulfur granules collecting and conveying and storage and packing.

The sulfur drum spray granulation process mainly has the following characteristics:

High production capacity. At present, the maximum single unit production capacity can reach 50 tons/hour.

The finished product has good quality. Liquid sulfur is produced from crystal seeds to particle size, and due to the principle of coating and cooling solidification, the finished particles are solid and dense. Therefore, compared to underwater granulation, there are no pores inside the particles, and the water content is lower, <0.4%, while underwater granulation is higher than 2%. Compared with belt type pastillation granulation, its finished product has the characteristics of high stacking density, low brittleness, and good fluidity. Its stacking density can be 1.15-1.3, while rotary steel strip granulation only can be 1.0-1.1, and the particles are flat and fragile.

Short process and low energy consumption. Atomized cooling water directly contacts the surface of granular materials, and the latent heat of vaporization directly evaporated by the cooling water carries away the heat of the material. This not only enables the material to quickly solidify, but also requires less water, no need of circulating water and corresponding wastewater treatment processes.

Low operating and maintenance costs. Compared with the sulfur underwater granulation process, it does not require a big cooling water circulation unit and a dehydration and dehumidification treatment unit for final product, resulting in relatively low energy consumption and operating costs. Compared with the belt pastillation process, the drum granulation process has outstanding advantages due to its simple and durable structure, long reliable operation time, maintenance cycle, and cost of vulnerable parts.