MECHANICHAL ENGG BOILER BLOWDOWN PROCESS IN SUGAR FACTORY
Boiler Blowdown process and Safety valves live operations in Sugar Factory
Over time, the concentration of dissolved solids from the make-up water increases in the boiler as pure water is removed as steam. Water is drained, or blown down, from the boiler periodically to maintain a consistent number of cycles of concentration. This process is essential to the prevention of scale and corrosion in your boiler.
Only pure water leaves the boiler as steam is produced; any dissolved solids are left behind. Even though the condensate is pumped back into the boiler, some is inevitably lost and must be replaced with make-up water. Over time, the concentration of dissolved solids from the make-up water increases in the boiler as pure water is removed as steam. The relationship between the level of dissolved solids in the boiler and the dissolved solids in the feedwater is termed cycles of concentration. Water is drained, or blown down, from the boiler periodically to maintain a consistent number of cycles of concentration. This process is essential to the prevention of scale and corrosion in your boiler.
How should I do the blowdown?
The bottom drain line on your boiler usually has two valves: a gate valve and a knife valve. The proper way to bottom blowdown a boiler is to start with both valves fully closed. Start by opening the knife valve, then completely open and then close the gate valve. Do this to both front and back drain valves if your boiler is so equipped. Repeat this process three times to rock the water in the boiler and work the sludge toward the drain line. Skimmer blowdown should also be on a regular schedule. Use a properly calibrated conductivity meter to determine the amount of skimmer blowdown needed. Maintain the conductivity of your boiler water in the range determined by your Chardon Master Service Technician. Finally, it is important to blowdown the safety valves, level switch and sight glass once every week to ensure that they will work when needed.
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