Why is deaerator installed at a large height from the basement? What is the function of deaerator?
What is supercritical steam cycle? Why is it more efficient?
An ideal steam power plant operates between 70 bar, 450°C and 0.07 bar. It has four feedwater heaters. Find the optimum pressures at which the heaters operate?
Explain the working of Rankine cycle and compare it with Carnot cycle.
Differentiate between reheat and regenerative cycle.
A steam turbine gets steam at 60 bar and 450°C from a steam generator that expands to a condenser pressure of 0.07 bar. Some amount of steam is bled from the turbine at 3 bar to heat the feed water from the condenser in an open type feed water heater. Steam turbine generates 30 MW. Determine (i) the steam generation per hour, (ii) efficiency of the plant.
What is the use of feed water heaters? What are the different types of feed water heaters? Discuss the various arrangements of feed water heaters.
What is the function of a superheater? Contrast convection and radiant superheaters.
A regenerative cycle has turbine inlet pressure of 40 bar and dry saturated. Steam expands in the turbine to a condenser pressure of 0.04 bar. Steam is bled at 3.6 bar from the turbine to heat the condensate water in the open type feed water heater. Neglecting the pump work, determine the cycle efficiency.
What is superheated Rankine cycle? How it is different from saturated cycle? Why superheated cycle is more efficient?
Explain the effect of regeneration on steam cycle output and efficiency.
A regenerative cycle operates with steam supplied at 30 bar and 300°C, and the condenser pressure is 0.08 bar. The extraction point for one open type feed water heater is 3 bar. Calculate the thermal efficiency of the plant neglecting pump work.
How in a coal fired power plant dust particle size affects dust collectors efficiency?
Why in steam power plant boiler makeup water is necessary and this water should be treated?
A condenser that handles 382 kg/sec of 90% steam quality at 0.08 bar, as well as 46 kg/sec of 45°C drain water from the feed water heater. Fresh cooling water is available at 20°C. Calculate the number of tubes required, cooling water flow rate, inner tube diameter and power required for cooling water flow rate. Given, tube outside diameter = 22mm, each tube length = 15m, two pass. Cooling water velocity = 2m/s. Overall heat transfer coefficient = 2 kW/m²-K. Terminal temperature difference = 3°C. Pressure drop in water boxes = 12.8cm H₂O, Pressure drop in tubes = 0.3cm water/cm.
Differentiate between saturated Rankine cycle and superheated Rankine cycle. If the two cycles work at the same boiler pressure which will be more efficient? Explain.
An ideal Rankine cycle operate with 180 bar, 550°C steam. It has one closed feedwater heater with drain pumped forward placed at 15 bar. The condenser pressure is 0.07 bar. TTD = 3°C. Calculate thermal efficiency.
What is once-through boiler? How do it differ from drum boiler?
Why fill is used in wet cooling tower?
Cooling water enters a cooling tower at a rate of 1000 kg/hr and 70°C. Water is pumped from the base of the water at 24°C and some makeup water is added afterwards. Air enters the tower at 15°C, 50% RH, 1.013 bar, and is drawn from the tower saturated at 35°C, 1.013 bar. Calculate the flow rate of the dry air and makeup water required per hour. CpaC_{pa}Cpa = 1.005 KJ/kg.K.