Sulfur is an important production raw material in the field of chemical industry. It is suitable for many industries such as rubber tires, medicine, paper, agriculture, chemical fiber, dyes, sugar and pesticide chemical industry. With the continuous advancement of science and technology, powder -like sulfur played a very important role in many industries and is an indispensable basic material. Sulfur powder has sulfide cross -linking effects in rubber products, giving rubber use of basic objects. Sulfur powder can regulate soil pH (mainly alkaline soil), which affects the absorption of nutrient elements such as iron. At present, most of the production of sulfur powder in production and manufacturing at home and abroad uses mechanical crushing methods. Sulfur particles will be charged in the process, and the powder has accumulated a large amount of static electricity. In addition, the special chemical properties of sulfur flammable and explosive, which leads to production and use of production and use There is a big burning explosion danger in the process. Nanjing University of Science and Technology independently developed a liquid -solid LS ultra -fine crushing machine for crushing and flammable materials, but the crushing machine is not suitable for sulfur powder to shatter; Zhang Fangqiang uses broad grinding sulfur powder to use in the system and use it in the system. Protecting the gas generator and flame retardant device, the device does not fundamentally solve the hazards of the combustion and explosion of sulfur powder. In the process of hierarchical impact grinding sulfur powder, Fu Yu and other humidified design to prevent static accumulation on the system to prevent static accumulation.
Although there are already flame retardant and explosion -proof equipment and technology, at this stage, it is no longer suitable for ultra -fine crushing processing flammable and explosive materials _. In order to meet the country's requirements for the safety of production safety in the chemical industry, nitrogen protection for the system can solve the burning harm in the processing process of sulfur powder. In the nitrogen protection system, determining the oxygen content is the most important. Under normal circumstances, it is lower than the extreme oxygen content value of 3 to 5 percentage points as the upper limit, lower than L to 2 percentage points as the upper limit. For sulfur powder, oxygen content, oxygen content The upper limit can be controlled to 5 % to 6 %, and the upper limit is 8 %. In this article, the nitrogen protection classy impact grinding is used as the experimental device to study the process of preparing sulfur powder, and the relevant data was tested during the system operation process and analyzed it.
Equipment and process experimental equipment is MJW -type nitrogen protection graded impact grinding system produced by Qingdao Youmingke powder machinery machinery. This system mainly includes oxygen content analyzer, nitrogen system (compressed air purification component, air, air Storage tank, nitrogen oxygen separation device, nitrogen buffer tank), feeding system (warehouse, star unloader), crushing host (transmission motor power 55kW), classifier (transmission motor power 1LKW), pulse spray blowing bag dust removal dust removal dust Oversal, high -voltage induction fan (transmission motor power of 30kW, maximum air volume 4900m), cooling system and programmable logic controller (PLC) control cabinet. The system is a closed crushing system. The airway system has an oxygen content analyzer, which can automatically monitor the oxygen content online in real time, and automatically supplement nitrogen when exceeding the alarm value. Most of the four parts of nitrogen -making, crushing, grading, and collection are mainly.
First, turn onThe oxygen content analyzer is preheated to reach the working temperature of 700 ° C. At the same time, the nitrogen preparation system is turned on to make nitrogen to achieve the work pressure 0.8MPa. When booting, first fill the nitrogen in the system, until the oxygen content of the entire system reaches the value set by the oxygen content analyzer (the mass is below 8 %); then open the feeding system, and the sulfur raw material with a particle size of 3 to 5mill Add the crushing cavity evenly. In the crushing cavity, several shocks such as hammer head, blades, and rods are generally impacted by high -speed rotation and materials. At the same time, mutual squeezing, friction, and collision between particles will also occur. In addition, at the gap between the impact and the lining plate, the particles will also be impacted and friction, thereby achieving the crushing of the material. In this experiment, the sulfur particles were used to make shocks. The crushed sulfur particles entered the hierarchical cavity of the classifier as the airflow entered the classifier, forming a free vortex airflow. There is a vertically placed hierarchical wheel rotor in the grading cavity. The gas of the sulfur particles enters the hierarchical wheel along the edge of the hierarchical machine and moves to the center of the turbine. The thick particles were thrown out of the hierarchical wheels because their centrifugal force was greater than the airflow drainage force, and returned to the crushing cavity. Complete the collection of products. The entire system adopts a series of automated hardware facilities and software programs such as upper machine, PLC, etc., to realize real -time monitoring and automation control of the system.