Power Plant Guruji

 Boiler Operation Engineer Interview Question - 27 Q. What is the effIciency of  power plant ? Ans .  Efficiency of the power plant is calculated based on heat input and out put. Power plant efficiency = Heat out put X 100/Heat In put.  In power plant, generally heat input is fuel, make up water and condensate return water from process. Heat out put is power generation. The formula for efficiency calculation is different for different plants. Efficiency of the power plant is given as.  Efficiency = 860 X 100/ Heat rate 1. For thermal power plants efficiency is calculated as; Efficiency = 860 X Power generation / Heat input.  Efficiency = 860 X PG X 100/ (Fuel consumption X Fuel GCV).  2. For co generation plants heat rate is calculated as; Efficiency = 860 X Power generation X 100/ (Fuel consumption X GCV + Make up water X Make up water enthalpy + Return condensate water X Enthalpy - Process steam flow X Enthalpy).  3. Co generation plant Efficien...

  Boiler Operation Engineer Interview Question - 26 Q. Why does the boiler backfire ? Ans.  Back firing of boiler is due to: 1.Unbalanced draught 2.Reduced speed of ID fan or more speed of FD fan 3.Improper locking of fans damper (which may disturb in fan running due to air pressure) 4.Sudden trip of ID fan or closing of damper 5.High moisture fuel 6.More excess air 7.Jamming of APH Read More Boiler Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Important Steam Blowing Questions Asked In Central BOE Interview  How it is been decided that RHS or LHS safety valve of steam drum is set at higher p...

 Boiler Operation Engineer Interview Question - 25 Q. What are the causes of higher flue gas outlet temperature of boiler ?  Ans.  1.Improper Heat Transfer in Economizer, APH:  Clean Economiser coils and APH tubes regularly, maintain flue gas temperature as per manufacturer guide. 2.Accumulation of Soot on Super Heater Coils, Economizer:  Operate soot blowers regularly. 3.Burning of Higher Moisture Content Fuel:   Limit the moisture content of fuel. 4.Higher Economizer Feed Water Inlet Temperature: Reduce steam flow to HP/LP heaters. 5.Excess Heating Surface of Boiler:  Modify the boiler pressure parts design in consultation with manufacturers and designers. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential...

 Boiler Operation Engineer Interview Question - 24 Q.What are the possible reasons for higher main steam temperature ? Ans.  1. Failure of Attemperator control valve 2. More boiler load 3. More heat transfer in super heater zone due to more velocity of flue gas 4. More firing rate 5. Low Economiser inlet feed water temperature 6. High moisture fuel 7. More excess air 8. Low drum level 9. Leakage of super heater coil Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Important Steam Blowing Questions Asked In Central BOE Interview  How it is been decided that RHS or LHS safety valve o...

 Boiler Operation Engineer Interview Question - 23 Q. What is the balanced draft system and why it is adapted here ? Ans.  Balanced Draft System is a combination of Induced and Forced Draught Systems. The Forced Draught Fan forces the air in to the furnace for combustion and the Induced Draught Fan sucks in gases from boilers side and discharges them in to the chimney. This System is used to create and maintain vaccum inside the furnace.  Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Important Steam Blowing Questions Asked In Central BOE Interview  How it is been decided th...

 Boiler Operation Engineer Interview Question - 22 Q. What are the reasons for lifting of steam drum safety valve ?  Ans.  Drum safety valve may lift due to following reasons: 1. Excessive fuel firing rate. 2. Sudden decrease in steam load. 3. Faulty setting of safety valve. The following actions have to be taken to bring boiler into normal operation: 1. Reduce fuel firing rate. 2. Open the start up vent valve. 3. Observe the steam flow of the super heater. If there is no flow, trip the boiler. 4. Maintain the steam drum level. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Impor...

 Boiler Operation Engineer Interview Question - 21 Q.1 What are the salts present in the raw water ?  Ans.  a) Calcium Chloride  b) Magnesium Chloride c) Calcium Sulphate d) Magnesium Sulphate e) Calcium Bicarbonate f) Magnesium Bicarbonate Q.2 Where the salts are removed ?  Ans.  Weak Acid Cation Bed - Temporary hardness causing salts in water are removed such as Calcium Bicarbonate, Magnesium Bicarbonate. Strong Acid Cation Bed - Permanent hardness causing salts in the raw water are removed.  The salts are Calcium Chloride, Magnesium Chloride, Calcium Sulphate, Magnesium Sulphate.  Q.3 What are all the other places where the salt is removed ? Ans.  a) Mixed Bed Unit b) Boiler drum by CBD Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent ...

 Boiler Operation Engineer Interview Question - 20 Q. How do you reduce the auxiliary power consumption of Boiler? Ans.  1. Maintain proper air fuel mixture so that speed of ID, FD fans and fuel feeding system can be optimised. 2. Avoid using high moisture coal as it requires more air for combustion. 3. Use VFD to fuel feeding system. 4. If boiler is running on load less than <30% shutoff the stand by fans. 5. Tune the feed water control valve for maximum opening to reduce the speed of Boiler feed pump. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Important Steam Blowing Question...

 Boiler Operation Engineer Interview Question - 19 Q. Why do high pressure Boilers have higher efficiency & lower fuel consumption? Ans.  Because: 1-High pressure boilers have higher saturation temperature.  2-High pressure boilers have higher feed water temperature at economiser inlet.  3-High pressure boiler have lower enthalpy of evaporation (latent heat) will be less.  H = Hf+Hfg + Cps x (Tsup-Tsat) Where, Hf = Enthalpy of liquid at operating pressure Hfg = Latent heat Tsup = Super heated steam temperature Tsat = Saturated temperature of steam Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circula...

 Boiler Operation Engineer Interview Question - 18 Q. What are the effects of high and low drum levels? Ans.  High drum level: Results into carryover of water into super heater coils which may damage coils due to high thermal shock. Can damage safety valve seats. Disturbs circulation ratio. Carry over with sharp fall in super heater temperature. Water may enter turbine and serious damages to turbine may occur.  Super Heater deposit and fouling. Turbine Deposit and increase in specific steam consumption. Low drum level may results less steam flow to super heater coils. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the ...