Preparation before starting the fertilizer dryer (core: identifying hidden dangers, setting parameters)

Raw material pretreatment: Ensure that the particle size and moisture content of the fertilizer to be dried are uniform (for example, granular fertilizer needs to be screened to remove large impurities and avoid equipment jamming; high humidity materials need to be dehydrated in advance to the required process range to prevent wall sticking).

Equipment inspection:

Mechanical part: Check the tightness and lubrication of the transmission system (gears, chains, belts), and whether there is any abnormal noise from the bearings; Check whether the board and scraper inside the drying cylinder are firm, without looseness or deformation.

Heat source system: Coal/gas hot blast stove needs to check whether the fuel supply and air duct valves are normal; The insulation of the electric heating tube needs to be tested to avoid short circuits.

Control system: Set reasonable hot air temperature (organic fertilizer 80-120 ℃, compound fertilizer 200-300 ℃), material residence time (adjust speed or conveying speed according to inlet/outlet moisture), and calibrate temperature sensors and moisture detectors.

Start up and run (core: gradual progress, monitoring key indicators)

Step by step start-up: Start the induced draft fan and heat source system first, wait for the hot air temperature to stabilize to the set value, and then start the material conveying system (to avoid material adhesion caused by cold feeding); When stopping the machine, the opposite is true. Stop the material first, and then stop the heat source and fan after the material in the cylinder is emptied.

Real time monitoring:

Temperature: If the outlet temperature suddenly rises, it may be due to insufficient feed quantity, and additional feed needs to be added; If the temperature drops sharply, it may be due to a heat source malfunction or excessive moisture in the material, and the machine needs to be shut down for troubleshooting.

Moisture: Regularly sample and test the moisture content of the finished product. If it exceeds the standard (such as>15%), the hot air temperature should be increased or the conveying speed should be slowed down; If it is too dry (such as<8%), reduce the temperature or increase the speed.

Equipment status: Monitor whether there is any abnormal noise from the motor and transmission components (such as friction sound, impact sound), observe the exhaust color (normally colorless or light gray, black smoke may be due to insufficient fuel combustion, and adjust the air door).

Special case handling (core: quick shutdown to avoid equipment damage)

If there is a blockage of biomass (such as clumping and accumulation at the outlet of the drying cylinder), immediately stop feeding, turn off the heat source, manually clean it, and then restart (do not reach out or use tools to insert into the cylinder during operation).

If there is a sudden power outage, all power switches should be turned off. After the power is restored, restart according to the startup process to avoid burning the motor when starting with load.