Huiyang Company is a physical manufacturer of dust collectors for fertilizer plants and compound fertilizer plants. Through in-depth research and on-site inspections of fertilizer and compound fertilizer production workshops, our technical personnel have successfully solved the problems of moisture absorption and hydrolysis of bag filters in fertilizer plants. By improving the structure of the dust collector, the problem of easy adhesion and blockage of the discharge system caused by fertilizer and compound fertilizer dust has been successfully solved. The application of offline dust cleaning and non-stop maintenance technology has laid a solid foundation for the long-term operation of bag filters.

Problems with the compound fertilizer production line:

1. The equipment that generates dust on the production line includes rolling screens, vibrating screens, vulcanization beds, and belt conveyors;

2. The pipeline is long, has high resistance, and the pipeline design is unreasonable;

3. The nature of compound fertilizer dust is easy to absorb moisture, and it is prone to hydrolysis in rainy weather and high air moisture content, causing the compound fertilizer pulse dust collector to stick to the bag and affecting the production line yield;

4. The working condition of the dust collector is crucial in the operation of the entire production line. Once the production line is started, it is not easy to stop, so the long-term normal operation of the dust collector is important.

Therefore, after conducting on-site investigations to understand the production process of compound fertilizers and the principles of dust generation, our company designed and developed a set of compound fertilizer selection and technical solutions.

The pulse bag filter in fertilizer plants is a new type of bag filter developed on the basis of conventional short bag pulse filters. It not only combines the advantages of chamber back blowing and pulse blowing for dust cleaning, but also extends the filter bag to fully utilize the role of compressed air blowing for dust cleaning. Overcoming the disadvantages of low intensity of chamber back blowing and simultaneous pulse blowing and dust filtration, it prevents dust reattachment and loss of control, thereby improving filtration speed, saving dust cleaning energy consumption, and extending the life of filter bags. The electrical control of the dust collector adopts a PLC programmable controller.

The working principle of the dust collector in the fertilizer plant is composed of ash hopper, upper box, middle box, lower box, etc., and the upper, middle, and lower boxes are divided into compartments. During operation, the dusty gas enters the ash hopper through the air inlet, and the coarse dust particles enter the middle and lower boxes upwards with the turning of the airflow. The dust accumulates on the outer surface of the filter bag, and the filtered gas enters the upper box to the exhaust duct of the clean gas collection pipe, and is discharged to the atmosphere through the fan.

The dust cleaning process involves first cutting off the clean air outlet duct of the room, so that the bag in the room is in a state of no airflow passing through (stopping the air and cleaning the dust in each room). Then open the pulse valve and use compressed air for pulse blowing to clean the dust. The shut-off valve should be closed for a sufficient time for the floating dust peeled off from the filter bag to settle in the ash hopper after the blowing, avoiding the phenomenon of dust adhering to the adjacent filter bag surface with the airflow after leaving the filter bag surface. The filter bag should be cleaned, and the exhaust valve should be automatically controlled by a programmable controller. Good sealing measures have been taken, and the air leakage rate is below 5%.

The fertilizer plant adopts the technique of intermittent pulse blowing for dust cleaning, which overcomes the shortcomings of conventional pulse dust collectors and counter blowing dust collectors. It has low emission concentration, low air leakage rate, low energy consumption, low steel consumption, small footprint, stable operation, and good economic benefits. Suitable for the purification of dusty gases and material recovery in metallurgy, building materials, cement, machinery, chemical, power, and light industry industries.