An industrial boiler produces 68,000 kg/hr of saturated steam at 4.5 MPa using residual fuel oil (No. 6 fuel oil). The ambient air temperature is 255 K, which is also the temperature of the oil storage tank. There is no air preheater but the oil is preheated to 373 K. The oil is pressurized to 5 MPa. There is a 50 mm water pressure drop across the air ducts and wind box. An economizer heats the feed water to 400 K. The stack temperature is 470 K. The heat loss due to incomplete combustion is 0.5% of the total heat input, and the radiation heat transfer losses are 5% of the total heat input. The excess air is measured to be 5%. The efficiency of the pump is 90%, and the efficiency of the blower is 70%. Calculate the boiler efficiency. Assume that properties of the products are the same as the properties of air.
An industrial boiler produces 68,000 kg/hr of saturated steam at 4.5 MPa using residual fuel oil...
I) Boiler superheater [3 marks) B) A steam boiler fired with oil of calorific value of 42 MJ/kg generates steam at a rate of 2500 kg/h and 1.5 MPa. The generated steam is further heated in a superheater to a temperature of 300°C. Feed water at 30°c is preheated to 90°C through passage in the economizer. The boiler unit has an efficiency of 78% i) Calculate the fuel/oil consumption rate (in kg/h) ii) Calculate the percentage increase in fuel consumption...
Fuel is burned in a boiler to produce saturated steam at 10.0 bar absolute pressure from saturated liquid water at 10.0 bar absolute pressure. This H20 flows through tubes that run through the boiler, Energy released by combustion is transferred as heat through the walls of the tubes to convert the liquid water to steam at 10.0 bar. The fuel consists of 37 mol% ethane and 63 mol% acetylene, and is fed in the vapor phase at 50 °C and...
You are to analyze a simple steam power plant. At the boiler exit, the pressure is 8 MPa and the temperature is 1000 °C. The turbine isentropic efficiency is 85%. The condenser pressure is 15 kPa and the water is a saturated liquid at the condenser exit. The pump isentropic efficiency is 80%. Answer the following: a) What is the quality at the exit in %, if the turbine is assumed isentropic? b) What is the work output of the...
Thermodynamics 1. Saturated liquid H20 at 16 MPa is fed into the boiler of a variant of a Carnot cycle (but simplified Rankin cycle) where the working fluid is not an ideal gas. Saturated H20 vapor is fed into the turbine of the same turbine. The condenser of this turbine is operated at 8 kPa. The mass flowrate of the H20 in this cycle is 7.2x103 kg/min. Draw the path of this process on T-s diagram. Estimate the thermal efficiency...
A bituminous coal is burned with air in a boiler furnace. The coal is fed at a rate of 40000 kg/h and has an ultimate analysis of 76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt% non-combustible ash. Air enters a preheater at 30 °C and 1 atm with a relative humidity of 30%, exchanges heat with the hot flue gas leaving the furnace and air enters the furnace at temperature Ta (°C). The flue...
1. An industrial plant needs 20,000 lbm of saturated steam at 280°F per hour for heating purposes and ten MW of electrical power. A small turbine system is to be designed to handle both of these needs. Steam is supplied to a turbine at 400 psia pressure from a boiler and expanded until 280°F saturated steam is obtained whereupon the steam needed for heating is extracted. The rest of the steam is expanded in a second turbine to a condenser...
Two components of a steam engine are shown in the figure below. The turbine is adiabatic. 2 boiler turbine m5 kg/s P 8.0 MPa 1-0 T2 300°C 2.5 m3/kg -0.06 MPa The properties of saturated water are given in Appendix 1. 1) Applying the first law of thermodynamics to the turbine, develop an expression for the power ou W. Justify all your assumptions and show all the steps of your calculation 2) What is the phase of the water at...
Thermo Final Exam open book open notes 2hrs 1. (10pts) A power plant can be described by an ideal Rankine cycle without any irreversibility's. he boiler produces superheated steam at a pressure of 200 bars and temperature of 600c (1). The steam expands adiabatically (and isentropicly) thru a turbine exiting as a saturated vapor/liquid mixture at pressure of 0.1bar (2). The mixture passes thru a condenser (P-0.1bar) until it is all saturated liquid (3). It is then pumped adiabatically to...
A combined cycle power plant consists of two gas turbines; cach produces a net power of 160 MW, and a 70 MW steam power cycle. The combustion of the fuel in the combustion chamber produces hot gases at 1400°C. The hot gases leaving the gas turbines are used to generate steam through the heat recovery steam generator (Boiler). The hot gases enter the heat recovery steam generator at 880°C and leaves at 660°C. Water enters the isentropic pump as saturated...
1. Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C and leaves the tubes at 6 MPa and 450°C with a velocity of 80 m/s. Calculate the velocity of the water at the tube inlet and the inlet volume flow rate. [5-14] 2. Air enters a nozzle steadily at 50 psia, 140°F, and 150 ft/s and leaves at 14.7 psia and 900 ft/s. The heat loss from the nozzle is estimated to be 6.5...