Automatic Blowdown Systems (Steam Boiler)
According to the type of water prepared in the feed water tank, salt and a number of impurities reach the steam boiler. As a result of evaporation, the salinity of boiler water increases. A salt concentration higher than the permissible value causes boiler stone, boiler corrosion and foam formation.
The foam not only prevents heat transfer inside the boiler but also can reach the steam installation. Thus, the desired dry steam cannot be obtained. The quality of steam distributed to the installation decreases and the accumulations of water generated force the fittings. Automatic Surface Blowdown System should be used to prevent this situation. The salinity concentration of the boiler water can be kept below the permissible limit value by discharge via the surface blowdown valve. The conductivity of the boiler water is measured (more saline is more conductive) by means of a conductivity electrode stuck directly into the boiler just below the boiler water level and the desired conductivity value is achieved by discharging the boiler water via a proportional valve. Unlike ordinary surface blowdown systems, the Vira BS4-T system is easy to use and suitable for any application with its heat compensation and 4-20 mA output. With heat compensation feature, it is possible to calibrate at desired temperature and pressure and it is plug and play ease. https://en.viraisi.com/automated-tds-blowdown-system
Some impurities and salts (rust, oil and dirt that may come from the installation) precipitate to the bottom of the boiler to form a sludge layer. Thus, the heat transfer capability of the boiler is reduced and there is a danger of corrosion in the boiler. These foreign substances and salts should be periodically disposed out of the boiler to prevent the formation of the settling layer. For this, Automatic Bottom Blowdown Systems are used. By opening the bottom blowdown valve, pressurized boiler water is discharged from the bottom of the boiler. Vira Automatic Deep Blowdown systems have many features other than ordinary timers. One of the most important features of the DB2 system is that the valve communicates the opening and closing status of the valves. If the normally closed valves are prevented from closing for any reason after being opened, the controller will warn you to take action. Only applications made with timer logic are insufficient in this regard. When more than one DB2 system is connected to the same blowdown line, the controllers communicate with each other and the other does not start until one valve is closed to prevent clogging. DB2 system provides the opportunity to operate for the desired time intervals. https://en.viraisi.com/bottom-blowdown-system
Automatic Surface Blowdown and Automatic Bottom Blowdown are complementary to each other, so both operations are normally required.