Aluminum sulfate, white orthorhombic crystal powder. In the paper industry, as a precipitant for rosin rubber, wax emulsion and other rubber compounds, as a flocculant in water treatment, it can also be used as an internal retention agent for foam fire extinguishers to produce alum, aluminum white raw materials, petroleum decolorization, deodorizer, and some Raw materials for drugs, etc. It is also possible to manufacture artificial gemstones and advanced ammonium alum.
1. Introduction of special drying machine for aluminum sulfate:
The pulsed airflow dryer is characterized in that the pipe diameter of the airflow drying pipe is alternately reduced and enlarged. The pulse airflow drying tube can fully exert the high heat and mass transfer effect in the acceleration section to strengthen the drying process. The added material particles first enter the drying tube with small diameter, and the particles are accelerated. When the accelerated movement ends, the diameter of the drying tube suddenly expands, and the particles enter the drying tube with large diameter according to inertia. During the movement, the particles are decelerated due to the resistance until the end of the deceleration, and the drying tube is suddenly reduced, so that the particles are accelerated again, so that the pipe diameter is reduced and enlarged repeatedly, and the moving speed of the particles is alternately accelerated. Deceleration, the relative velocity and heat transfer area between the air and the particles are large, thereby enhancing the rate of heat and mass transfer. At the same time, the decrease in the airflow velocity at the large pipe diameter also increases the drying time.
Second, special drying machine for aluminum sulfate Structural features:
The drying strength is large, the equipment investment is small, the airflow drying treatment volume is relatively good, and the water evaporation capacity is from 50kg/h to 5000kg/h, which is not comparable to other drying equipment. High degree of automation and continuous operation. It is only necessary to control the feeding speed of the screw feeder, and the material is dried in a very short time (0.5~2 seconds), and the labor intensity is small. The material temperature is low. Although the air temperature is very high (up to 500 ° C), since the material is in a constant drying period, the surface temperature of the material can only be the air wet bulb temperature, so it is suitable for the drying of heat sensitive materials. The material is not in contact with the outside world and the pollution is small. The heating method can be arbitrarily selected. Our products can be supplied, steam heating (below 140 °C), electric heating mode (or both), coal-fired hot blast stove (below 300 °C), fuel hot blast stove (below 600 °C), users can choose according to the conditions.
Third, special drying machine for aluminum sulfate Technical parameters:
Special pulse airflow dryer, special drying machine for aluminum sulfate, safe operation procedure for aluminum sulfate dryer
(1) Driving procedure
All transmission equipments are flexible and normal through the disk transfer, and each position is ready, and the safety can be improved before starting the vehicle.
(1) First start the induced draft fan, so that the butterfly valve is opened at the required scale to ensure the gas flow.
(2) Start the air compressor, control and regulate the multi-channel compressed air to operate under the design pressure process conditions.
(3) Open the bag pulse controller backflushing system and adjust the backflush frequency to ensure that the gas inlet pressure works between 0.5-0.6Mpa.
(4) Before the wet material is put into the feed, the water content must be measured and put into the hopper, and the screw feeder is to be started.
(5) Heating the coal-fired hot blast stove to gradually increase the air inlet temperature of the dryer. When the air outlet temperature of the dryer exceeds 110 °C, start the screw feed motor to adjust the feed rate to ensure that the outlet temperature is around 60 °C. stable. When the inlet temperature reaches 130-150 °C, the speed of the feed motor is readjusted, and the inlet and outlet temperatures of the dryer are controlled to operate under the design temperature process conditions.
(6) Observe whether the equipment (and other parts) in the system are operating normally.
(7) Sampling and testing After the quality of dry powder is qualified, it is packaged and stored.
(two), parking procedures
(1) First stop stopping the screw feeder feeding.
(2) Continue to dry the remaining material in the dryer and take it out of the machine. After half an hour, stop the hot air furnace. After that, the induced draft fan is stopped.
(3) Stop the air compressor and stop the baghouse backflushing system.
(4) Stop the instrument control.
(3) Possible abnormalities and exclusions:
In the drying operation, the air flow, the air inlet and outlet temperatures, and the feed amount in the dryer are mainly controlled. The amount of feed is adjusted as a dependent variable.
1. When the gas inlet temperature is constant, other conditions are normal, when the gas outlet temperature is high, slowly increase the feeder speed to increase the feed amount, so that the gas outlet temperature is lowered to the required temperature; conversely, when the gas outlet temperature is low, the effect is dry. The moisture content of the product reduces the speed of the screw feeder, reduces the amount of feed, and raises the temperature of the gas outlet to the required temperature.
2. When the gas inlet temperature of the dryer is high, when the negative pressure in the drying tower is low, the feeding speed must be lowered. After the negative pressure in the tower is stabilized, the feeding speed is re-adjusted to ensure the outlet temperature is the design value.
3. When the system pressure is unbalanced, check whether the system has air leakage or blockage, and whether the pressure measuring tube is blocked.
4. When the bag dust collector gas outlet is a powder, check whether the bag is detached or damaged, and replace and repair it in time.
5. When the power is suddenly cut off for a long time, the dryer should be cleaned to prevent the wet material in the machine from being dry and hard, blocking the ring gap of the dryer, and driving the car to affect the product quality.
6. If the system pressure suddenly increases and cannot be eliminated, the power should be cut off immediately, and the operator should quickly leave the operation site to prevent personal injury when venting.
7. If the squib valve suddenly opens during operation, the personnel must be evacuated in the first time and the pilot fan should be turned off first and then the feeder should be turned off.
