http://www.brighthub.com/search/searchresults.aspx?u=3780&o=DateDescending&a=275Posts by Dr V T Sathyanathanen-UShttp://www.brighthub.com/engineering/mechanical/articles/56779.aspxFri, 20 Nov 2009 22:34:07 GMTb133e95a-c263-4882-8f2a-b24547eff78e:56779drvtsFurnace seal breakage can result in unit trip either due to high furnace pressure or due to flame failure. Hence it is a good operating practice to keep a regular check and maintain the water level in the furnace bottom seal trough. Top supported balanced draft furnaces are designed with a furnace bottom seal to take care of the downward expansion ...http://www.brighthub.com/engineering/mechanical/articles/55997.aspxSun, 15 Nov 2009 17:37:52 GMTb133e95a-c263-4882-8f2a-b24547eff78e:55997drvtsHigh furnace pressure is a direct indication of a disturbance in combustion performance. The rate of change in the furnace pressure can vary very much, that is from a simple sudden surge due to fuel variations to a huge furnace explosion. Combustion in a boiler furnace is normally considered a controlled explosion, as all boilers operate at a regim...http://www.brighthub.com/engineering/mechanical/articles/55816.aspxFri, 13 Nov 2009 18:27:34 GMTb133e95a-c263-4882-8f2a-b24547eff78e:55816drvtsThe performance test in a boiler evaluates the practically achievable boiler efficiency. Performance tests are also carried out to prove boiler guarantees. As guarantees involve contractual conditions, the procedure involved are more elaborate than the test for evaluating performance. Conducting a boiler performance test can be for understanding th...http://www.brighthub.com/engineering/mechanical/articles/55564.aspxWed, 11 Nov 2009 18:19:13 GMTb133e95a-c263-4882-8f2a-b24547eff78e:55564drvtsThe mill outlet temperature directly impacts the dry gas loss in boiler which is a major loss and in turn a loss of boiler performance and efficiency. Two major parameters which decide the mill capacity and performance are the hardness of the coal and the total moisture level in the coal. Pulverizing mills in boiler plants play a major role in prep...http://www.brighthub.com/engineering/mechanical/articles/55062.aspxThu, 05 Nov 2009 20:58:20 GMTb133e95a-c263-4882-8f2a-b24547eff78e:55062drvtsReheat steam temperature imbalance in tangential fired boiler is common when coal is the fuel and the quality of coal changes. It can lead to higher tube metal temperature and can bring down life of tube depending upon increase from the allowable value. Reasons and how to correct this are discussed. In a tangential fired boiler, coal as a fuel can ...http://www.brighthub.com/engineering/mechanical/articles/53357.aspxSat, 24 Oct 2009 17:27:31 GMTb133e95a-c263-4882-8f2a-b24547eff78e:53357drvtsReheater temperature variation will have an impact on the cycle efficiency of the plant. Boiler designers adopt methods like divided second pass, burner tilting, water injection, gas recirculation, etc. to control reheater steam outlet temperature. Power plant cycles have the steam from the high pressure turbine reheated before it goes to the mediu...http://www.brighthub.com/engineering/mechanical/articles/52825.aspxMon, 19 Oct 2009 17:30:09 GMTb133e95a-c263-4882-8f2a-b24547eff78e:52825drvtsFouling of the heat transfer surface of a boiler is a factor which can reduce availability of the boiler as well as reduce the operating efficiency of the plant. Fuel composition, heat transfer surface arrangement, gas velocity adopted, etc, are the key factors for reducing fouling in boiler. Fouling in a boiler heat transfer surface is different f...http://www.brighthub.com/engineering/mechanical/articles/52543.aspxThu, 15 Oct 2009 16:23:34 GMTb133e95a-c263-4882-8f2a-b24547eff78e:52543drvtsThere are many causes that can contribute to boiler flame failure. Operating the boiler with unstable flame is always dangerous and can lead to boiler explosion. Tripping the boiler is the option for all boiler designers and operators. Maintaining a good flame in a boiler is the key to a good boiler performance. Unstable flame is always a threat fo...http://www.brighthub.com/engineering/mechanical/articles/52320.aspxTue, 13 Oct 2009 17:45:54 GMTb133e95a-c263-4882-8f2a-b24547eff78e:52320drvtsIn regenerative type air heater in boiler when the electrical motor trips always the air motor start on auto. Failure of this will lead to a major breakdown of air pre-heater and loss of availability of boiler. Regenerative air pre-heaters are used in large capacity boilers due to the design's compactness. These air pre-heaters rotate at slow revol...http://www.brighthub.com/engineering/mechanical/articles/52069.aspxSat, 10 Oct 2009 15:37:03 GMTb133e95a-c263-4882-8f2a-b24547eff78e:52069drvtsCarryover from the boiler drum leads to deposit in superheaters of boiler and turbine blades. Carryover from drum is of two types- mechanical and vaporous carryover. Deposits in superheater tubes results in overheating failure. In the turbine, this reduces the turbine efficiency. In a high pressure large capacity boiler, the drum acts not only as a...