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Showing posts with the label Efficiency & performance

Why does vacuum in steam condenser reduce or drop??

  1-High exhaust temperature: Vacuum drops or maintains at lower side due to high exhaust steam temperature flow into steam condenser. This high exhaust temperature is mainly due to 1-Operation of Turbine at lower loads 2-More clearance in labyrinth seals 3-Not operating exhaust hood sprays 4-More load on condenser 5-Breaking of ejector U loop 2-Low circulating cooling water flow Vacuum in condenser reduces due to inadequate cooling water flow through steam condenser. This is mainly due to; 1-Problems associated with pumps 2-Air pockets in pipe line 3-Leakages in cooling water line 4-Stuck of discharge valve of pump 3-High cooling water temperature at condenser inlet Higher cooling water temperature at condenser inlet results into reduction of vacuum due to poor heat transfer from steam to water 4-Poor heat transfer in condenser Very less or poor heat transfer in steam condenser reduces vacuum to very low level resulting into high exhaust temperature &am

It's all about HP heaters (Feed water heaters) in Power plants

  1-Why do you use HP heaters in power plants? HP heaters are used for heating the feed water, which will contribute in increasing cycle efficiency as well as reduction in fuel consumption 2-What is the design code of HP heaters? HEI, ASME SEC VIII Div-I IBR 3-What are the advantages of using feed water heaters in power plants? Fuel consumption reduces  Reduce heat losses in the condenser  Lower emissions as fuel use is reduced due to improved heat rate Decreases the plant heat rate & hence increases the plant efficiency 4-What are the different types of feed water heaters? Open type feed water heaters & closed type feed water heaters 5-What do you mean by open type of feed water heaters? In open type feed water heaters steam directly mixes with feed water. Steam pressure used is lower < 5 kg/cm2 6-What do you mean by closed type of feed water heaters? In closed type feed water heaters steam directly mixes with feed water. Steam pressure used

15-Equipments efficiency calculation in power plant

Efficiency is the ratio of useful energy output to the total energy input  to the system or equipment So, efficiency = Useful energy output X 100 / Total energy input. This, energy can be Electrical, heat, pneumatic, hydraulic etc 1-Furnace efficiency: The efficiency of a furnace is the ratio of useful output to heat input. The furnace efficiency can be determined by both direct and indirect method. The efficiency of the furnace can be computed by measuring the amount of fuel consumed per unit weight of material produced Furnace efficiency = Heat released in furnace X 100 / Fuel energy supplied Solved example: Calculate the furnace efficiency of a Boiler which releases 18   Mcal/hr heat & consumes coal fuel 10 TPH, take fuel GCV as 2250 kcal/kg Ī·furnace  = 18 X 1000000 X 100 / (10 X 1000 X 2250) = 80% 2-Boiler efficiency: Boiler efficiency is calculated by two methods 1-Direct method: A-Boiler feed water & attemperator water is at same temper