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IBD and CBD
Friday, June 21, 2013 By: saubhik [1585]  Can anyone explain me in detail the function of IBD and CBD in a boiler? I have joined a thermal power plant recently as executive and undergoing my training....If possible also give me link to some manual where I can read more about this topic
Post a Reply... Viewed 8767 times
Friday, June 21, 2013 By: Rick [195]  IBD is intermittent blowdown. CBD is continuous blowdown. IBD is used instead of or in conjunction with CBD.
CBD is accomplished with a metering valve or a valve in which you can change the size of the orifice. CBD removes the impurities in the water that accumulate near the surface in the steam drum due to their reduced solubility in the water. By removing these impurities near the surface, it prevent them from bonding together to form larger masses that become heavier than the water and drop to the bottom in the form of scale deposits. Post a Reply... Viewed 8776 times
Friday, June 21, 2013 By: Jim Watts [764]  As Rick says IBD and CBD refer to blowing down the boiler water to a drain either continuously or intermittently.
A continuous blowdown is to remove dissolved solids and prevent the water from concentrating to high. It blows down from a location which avoids blowing down new feedwater coming in to the drum. Intermittent blowdown blows down solids which have precipitated from the water and settled in a low flowing area such as the bottom drum or bottom headers. Blowing down from these areas disrupts circulation and cannot be carried out continuously and on some boilers no firing is allowed. A general reference with overall detail and drawings is available at http://tinyurl.com/m2ng5k8 Post a Reply... Viewed 8775 times
Friday, June 21, 2013 By: Jim Watts [764] As Rick says IBD and CBD refer to blowing down the boiler water to a drain either continuously or intermittently.
A continuous blowdown is to remove dissolved solids and prevent the water from concentrating to high. It blows down from a location which avoids blowing down new feedwater coming in to the drum. Intermittent blowdown blows down solids which have precipitated from the water and settled in a low flowing area such as the bottom drum or bottom headers. Blowing down from these areas disrupts circulation and cannot be carried out continuously and on some boilers no firing is allowed. A general reference with overall detail and drawings is available at http://tinyurl.com/m2ng5k8 Post a Reply... Viewed 8741 times Published on steamforum.com
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