Flash dryer specification operation method and abnormal situation solution

  The flash dryer is tangentially dried by hot air into the bottom, and the strong wind driven by the rotation of the agitator. The material is fed into the dryer by a screw feeder, a high-speed rotating impeller under a strong function, the influence of materials, friction, and dispersion under the action of shear force. The material is rapidly pulverized, and is in good contact with hot air, heat, and drying. . The dry matter is collected into the dust collection system and meets the requirements of environmental protection. The exhaust gas with a dust content of 50 mg / m3 is evacuated by the induced draft fan to complete the entire drying process. Let's talk about the standard operation and abnormality elimination of the flash dryer.

First, start the program

The dial is flexible, the normal transmission equipment, all kinds of work in place, safe and correct heating before starting.

1. The first one starts the induced draft fan, then starts the blower, opens the size of the butterfly valve, and ensures the gas flow. The induced draft fan regulates the opening of the valve and the dryer operates under a slight negative pressure.

2. Start the air compressor of the flash dryer to control the compressed air pressure under multi-channel operating conditions. During the design process, open the cooling water pipe of the lower tower.

3. Open the bag pulse backflush system controller and adjust the frequency to ensure that the gas inlet pressure works at 0.5 - 0.6 Mpa.

4. Before wetting the material, we must first determine the water content > < input into the hopper, start the mixer, and mix the materials.

5, open the flash dryer gas valve into the gas ignition temperature and air dryer inlet temperature gradually rises, the air outlet temperature exceeds 110 ° C dryer, start the motor, feed speed adjustment control to ensure a stable outlet temperature at 90 ° C to 100 ° C. The inlet temperature reaches 350 - 400 ° C, the motor speed is adjusted, and the design temperature of the drying tower body and the inlet outlet temperature is controlled.

6. Observing the device () and other parts of the system operation are normal.

7. Sampling and testing the quality of dry powder materials after packaging and storage.

Second, stop the program

1. The first station of the wet material mixer mixing tank, then stop the screw feeder loading.

2, will continue to blow dry the remaining material in the dryer, half an hour after closing, through the gas, stop gas heating. After stopping the fan to supply air, then stop the induced draft fan wind.

3. Stop the flash dryer air compressor, stop the backflush bag filter system, turn off the cooling water, and turn off the body movement of the tower.

4. Stop instrument control.

Third, possible exceptions and exclusions

The flash dryer mainly controls the dry air flow of the dryer operation, the temperature of the air inlet and outlet, and the shoes. One plus shoes as a dependent variable.

1. Gas inlet temperature, other under normal conditions, the gas outlet temperature is high, slowly increasing the feeder speed to increase the feed rate, so that the temperature of the gas outlet temperature drops to the required; on the other hand, the gas outlet temperature is low, Affect the moisture content and reduce the speed of the screw feeder, reduce the feed rate, and make the temperature of the gas outlet temperature required.

2. The temperature of the inlet of the flash dryer is very high. When the feed rate of the negative drying tower must be reduced, the feed rate is adjusted after the negative pressure tower is stabilized, and the outlet temperature is guaranteed to be 90 °C.

3. The system pressure is unbalanced, check whether the system is leaking or blocked, and whether the pressure measuring tube is blocked.

4. The bag dust collector exports natural gas powder to check whether a bag is detached or damaged, and replaced and repaired in time.

5. Sudden power failure for a long time, the dryer is cleaned to prevent the machine from being wet and dry, preventing the opening of the piston ring of the dryer, and then driving to affect the quality of the product.

6. If the system pressure suddenly increases, it cannot be eliminated, and the power supply is cut off immediately. The operator quickly leaves the working place of the flash dryer to prevent personal injury caused by venting.

The flash dryer is especially suitable for cake shape materials, paste, and slurry drying. Drying tower drying time of wet materials is only 5 to 8 seconds, instant water evaporation, dry product quality and drying temperature, wind speed, air volume, breaking rate, adjustable flash drying and tangential air inlet, adjustable discharge particle size and final moisture content.