Modern boiler plants are increasingly focused on energy efficiency, reducing their physical footprint, as well as minimizing capital and installation costs. Companies are striving to keep their total cost of operation as low as possible to remain competitive in the global economy. One of the challenges is having a steam supply that can handle large variations in demand. If the boiler is too small to handle peak demands, the plant cannot operate as designed. If the boiler is sized to handle short bursts of steam, the boiler may be oversized and have higher energy input versus output due to lower efficiencies at lower loads.
Boilers and steam production are essential to our modern lives. Boilers are used in almost every industry from generating electricity to heating buildings and everything in between. Due to the diverse demands for steam production, boilers come in various types and sizes.
With the impact of COVID-19, the ongoing partnership between plant personnel and your water treatment provider is more important than ever. Water systems, such as cooling towers and boilers, are dynamic systems by design. In today’s environment, they may not be operating as consistently as before with entire processes or facilities being shut down with little warning and, just as quickly, started back up.
A deaerator preheats boiler feedwater and removes dissolved gases, especially oxygen and carbon dioxide. These gases are undesirable because they cause corrosion and increase treatment chemical requirements.
Deaerators operate based on the reduced solubility of dissolved gases as temperature increases. For example, the solubility of oxygen decreases from about five ppm at 150ºF to about two ppm at 190ºF. Virtually all the free carbon dioxide gas is removed by increasing the temperature to greater than 170ºF.
A Critical Component of the Boiler Water Treatment Program
In a steam boiler system, blowdown involves removing a portion of the concentrated boiler water and replacing it with feedwater, which is a mixture of condensate and makeup water.
Good blowdown control is a critical component of the boiler water treatment program. Boiler blowdown is heated, treated feedwater that is sent to the drain instead of converted into steam. Blowdown is used to control the dissolved and suspended solids level in a boiler within the range necessary to minimize scale deposits and carryover. Too much blowdown increases fuel, water, and treatment requirements. Too little blowdown can cause scale deposits and wet steam (carryover)