Spray granulation dryer use and routine maintenance (Forum articles)
Source： | Date:
2010-10-22
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1, Introduction
Spray granulation drying machine is a PTC thermostat ceramics production process of the important equipment, which higher prices to form a complex, difficult to use and maintain. Device to function well, not only to ensure that PTC thermostat ceramics normal production, but also may be appropriately extended equipment life, lower production costs, so the proper operation of the equipment and the strengthening of maintenance is necessary.
2, Spray granulation drying machine theory and composition
Granulation is a PTC thermistor ceramics production process, a very important process, aggregates a direct impact on the quality of the appearance of PTC ceramic, mechanical properties and resistance-temperature characteristics. Granulation refers to finely ground powder by adding a certain amount of adhesive, even after reconcile and make it a granular powder, this powder has good liquidity and rolling, so as you can in the tabletting process get has good strength, not easy to layer cracking film. In the industrial production of granulation by spray-drying method, whose basic principle is to powder with a binder, using spray atomization into the granulation tower to tower the droplets are hot air drying tower into a particle -like powder, and then discharged from the bottom of the drying tower.
The company uses the pressure-type spray granulation drying machine mainly by the feeding system, drying system, dedusting system, heating system and electrical system components, and each system also includes a number of related equipment.
Feeding system consists of mixing drums, filters, diaphragm pumps, and spray gun so on. A good secondary milling slurry transferred to the mixing drum from the ball mill, after the filter was extracted diaphragm and send, and then through the spray gun into the drying tower.
Slurry from the spray nozzle into the drying tower began spray granulation drying process, the specific process is divided into three stages:
(1) slurry atomization. Slurry from the feeding system in order to put some pressure on the diaphragm pressure from the nozzle into the drying tower, the pressure energy is converted to kinetic energy, slurry from the bottom up from the nozzle, forming a layer of high-speed film, liquid film then divided into droplets. Spray droplet size and pressure generated is inversely proportional to the productive capacity of the nozzle and pressure proportional to the square.
(2) tablets of dry fog into a ball. Fog particles and hot air to work the way mixed-flow, hot air is through the roof on a hot air distributor into the tower, hot air distributor generates a stream of air down the flow line of flow, droplet spray from the bottom up into the heat air flow. Droplet surface tension due to the role of the formation of spherical, and because a large surface area of droplet, in which evaporation and drying, and eventually contracted to form a dry powder of spherical particles.
(3) The powder particles discharged. Spherical particles formed by the gradual settlement of the tower in a dry powder, and hot air separation tower bottom cavity of the funnel so that granules together and discharged from the discharge port. Smaller pellet, together with the dry air from the funnel-shaped with the upper part of the exhaust fan connected to enter the dust extraction system.
Drying tower for conveying hot air blower, drying up the tower as well as the exhaust fan drying system.
Dust removal system consists of high efficiency cyclone separator, bag filter, centrifugal fan so on. Exhaust fans will be smaller pellet, together with the dry air into the high efficiency cyclone separator. After the effective separation of finer particles at the bottom of separator material into the collection tube recycling, the remaining material contains a very small amount of fine particulate emissions from the centrifugal fan through the inhalation bag filter to collect dust once again realized the harmless exhaust gas treatment, the final The exhaust gas discharged from the chimney.
In addition, the electric heater and gas stove machine composed of dry Tahti heating system heating air. Electrical control cabinet, and installed in the inlet and discharge port of the in situ sensors to monitor the temperature of the electrical system composed of the entire spray granulation drying machine in all key aspects of monitoring and control, to ensure the normal operation of the entire device.
3, Daily operation and Notes
In the daily production process, starting equipment should be carried out before the necessary preparations. First check all devices, bearings and seals part of the availability of loose connections and all mechanical components of the oil situation and the various water, wind, such as slurry pipe valve port is in the desired location. Then check the voltage and connected to the power meter is normal, the final inspection slurry mixing barrel, and the amount of slurry concentration, and if a problem should be immediately removed.
Followed by open blower, ventilation, air, and then open the heating switch to warm up. When the discharge port temperature reaches the set temperature (usually about 130 ℃), start the feed pump and dust removal system. When the pump pressure to achieve 2MPa, open the gun began to granulation. Equipment operation, it should be promptly observe the spray conditions and feed pump working condition, If there is the phenomenon of blocking the gun nozzle for immediate cleaning or replacement.
Equipment is functioning correctly, should be expected from time to time received, time to check system operation, recording of all process parameters, and pay attention to clean-up vibrating screen filter.
Granulation end of the heating device should first be shut down, stop the gas engine is running. And then close the gun valve replacement spray gun, screw under the nozzle and rinse. When the inlet temperature reduced to below 100 ℃ after the blower and exhaust fans can stop running. Then clean-up inside the drying tower and filter more than expected, the closure of dust and air hammer, the final closure of the total power, complete production operation.
In case of emergency, must be immediately shut down equipment, should first be closed down and the feed pump blower. If Tuyu power outage, should be pulled out of gas engine, so that the natural cooling tower, and then open the sewage valve, behind every pulp slurry pipelines, and cleaning equipment.
4, Maintenance
PTC in the granulation is an important part of the production process to maintain the normal operation of equipment is to ensure stable production of the necessary conditions for PTC. Regular cleaning, maintenance and care can contribute to timely identify problems and address potential failures, reduce downtime, and ensure the production of normal and stable.
Equipment, long-running or because of improper operation, some devices will appear within the aggregate affect the normal operation of the cleaning time required to stop working. For the drying tower aggregate clean-up, cleaning the door should be opened with a long broom to remove the bottom of the funnel-shaped aggregates, open the discharge valve and rinse with tap water tower. Clearance within the dust collection cyclone, the same need to open the cyclone, with a broom sweeping set of material, if necessary, also need to wash with water. Bag filter for the clean-up, should open the control switch, continuous beat, and then open the cleaning door, beat bag filter, finally replace the filter bags. Slurry pipeline system for the clean-up, should open the two-way filter sewage valve, cleaning filters and pipe filters, and then open the feed pump, water on behalf of the material, cleaning pump tube, regulator bag and pipe.
After a period of time (typically 600h or so) of the operation, should take the necessary spray granulation drying machine inspection and maintenance. For the feeder system, should check the filters, piping, valves, nozzles and so on, to see whether the plug, regular cleaning, inspection nozzle wear for timely replacement. Should check whether the feed pump for oil spills, pressure is normal, the oil level is normal and so on. For the fans, should check whether the shaft and bearing short of oil fever, with or without vibration, noise, etc., if necessary, to clean the fan and a fan to do a balancing proofreading. For the heater, heat pipe should be checked whether it is normal, if necessary, to clean the pipeline, pump, nozzle 3 of the filter. In addition, should also be noted whether the motor heat, vibration, different sound and so on, instrumentation and electrical control cabinet is working properly and so on.
In addition, equipment operation around 2400h (generally taking advantage of cut-off period) is required by the maintenance staff to undertake partial disintegration of the equipment and maintenance.
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