Spread plates are generally placed in the bottom of the cyclone tube. Experience tells us that the material through the flap valve is a group, one by one. Such clumps or stock material, air flow cannot bring directly into the cyclone caused by a short circuit.
First, the regulation of the angle of material distribution board
Spread plates are generally placed in the bottom of the cyclone tube. Experience tells us that the material through the flap valve is a group, one by one. Such clumps or stock material, air flow cannotbring directly into the cyclone caused by a short circuit. The role of the spreader is to dangling the slug or strand of material so that the materialevenly disperses into the airflow of the inlet pipe of the next cyclone. In the preheater system, the heat transfer between the gas stream and the evenly dispersedmaterial is mainly carried out in the pipe.
Although the structure of the preheatersystem has a big difference, but the following set of data is basically thesame. Under normal circumstances, the majority of cyclone inlet and outlet gastemperature difference is about 20 ℃, out of the cyclonematerial temperature is lower than the outlet gas temperature about 10 ℃. This showsthat in the cyclone material and gas heat exchange is minimal.
Therefore, the spread of the material will spread the degree of material quality, determines the size of raw materialheating area, a direct impact on heat transfer efficiency. Spreading materialangle is too small, material dispersion effect is not good. On the contrary,extremely easy to be burned, and large stock material collapse, due to thesmaller cross-sectional area of the pipe, prone to blockage. Therefore,during production debugging should be repeatedly adjusted its perspective. Atthe same time, pay attention to observe the temperature difference between theimport and export of cyclones at all levels, until transferred to the bestposition.
Second, the flap valve balance bar angleand weight adjustment
The preheater system is equipped with avane for the discharge tube of each cyclone. Under normal circumstances, theflap valve swing the higher the frequency, into the next stage cyclone intakepipe material more uniform, the possibility of short-circuit airflow issmaller. The degree of flap valve flap flexibility depends mainly on the angleof the flap valve balance bar and its counterweight. As a rule of thumb, theflap lever should be below the horizontal line and at an angle of less than 30degrees to the horizontal line. Someone made a calculation, it is best to betransferred to about 15 degrees. Because then the balance bar and the weightcenter line of gravity displacement change is small, and with the valve openingincreases the center of gravity and the valve shaft spacing increases at thesame time. Torque increases, valve plate reduction time required to shorten theflap valve swing flexibility can be increased. As for the counterweight, itshould be in the cold when the initial transfer, transferred to gently lift thebalance bar with your fingers up, a loose balance bar to reset. Hot state, justfor individual flap valve for micro adjustment.
Third, compressed air anti-blocking purgedevice purge time adjustment
Preheater system, each stage cycloneaccording to its location, internal temperature and material properties ofdifferent, generally have 1 to 3 cones in the air compressed air anti-blockingpurge device. Air pressure is generally controlled at 0.6-0.8MPa. When thesystem is running normally, the computer will automatically purge it regularly.Purge time can be set manually as needed. Generally every 20min or so, theentire system automatically turns sweep again. Each stage cyclone purge 3-5s.When the preheater system pressure fluctuations or frequent occurrence ofcollapse and other anomalies, ready to shorten the purge interval, and even canbe set in a cyclone cylinder for a long time continuous purge. Of course, noabnormalities should not take this purge method. Because blowing a lot of coldair will destroy the normal system of thermal system, reduce thermal efficiencyand increase system heat consumption.