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- The heating value of the a dry fuel is 18 MJ/kg. a) Calculate the effective heating value of a fuel with 40% moisture and no flue gas condensation. b) Calculate the heating value of a fuel with 40% moisture and flue gas condensation Evaporation enthalpy H=2257 kJ/kg. Cp=4,2 ( kJ/kg,K) The heating value of a moist fuel is given by this formula: H=H0*(1-f)-f*2,6 (MJ/kg), H0=heating value of dry fuel, f=fraction of water.When performing a combustion efficiency test, digital flue gas will measure what four parameters?____________, and________.7. Describe the difference(s), if any, between pre-mixed and diffusion type combustion. Please select all answers that apply: a) In pre-mixed type combustion, the fuel and oxidizer are mixed before entering the combustion chamber. b) In diffusion type combustion the fuel and oxidizer enter the combustion chamber from two separate inlet streams. c) In pre-mixed combustion the fuel and oxidizer enter the combustion chamber through a single stream. d) In diffusion combustion, the fuel is injected through a nozzle. e) In diffusion combustion, the oxidizer swirls around the fuel nozzle.
- Methane fuel is burned with air in a boiler system (open system). For this system, the HFK value for the air supplied to the combustion environment is 1.4. If the temperature and pressure of the air and fuel entering the combustion environment is 25 ° C and 1atm, we calculate the flue gas temperature value of the boiler, assuming that the boiler's thermal efficiency is 60%. All reacting species and reaction products are perfect gases. There is no water condensation in the products. METANAID = 50000 kJ / kg HFK = Air excess coefficient All reacting species and reaction products are excellent gas. Products "no water condensation.H1. Assume that 3.75 kg/s of air, at 750k and 20 bars, enters the premix chamber of a combustor. The target temperature inside the combustion chamber is 1900K. The following cases are to be analysed a) 100% Methane b) Blends of Methane and Hydrogen, with 30%-50% and 80% H2 by volume c) 100% Hydrogen For each case assume that Nitric Oxide (NO) is present in the products and is in equilibrium Calculate i. The mass flowrate of fuel required for each case ii. The resulting parts-per million of NO produced for each case.) A 300 MW pulverized coal-fired power plant of 42% efficiency uses coal with an ash content of 19% and a neating value of 24,000 kJ/kg. Assume 28% of the ash content goes up the stack as particulate matter in the flue gas. The PM emission is controlled by an ESP which has the following efficiencies and weight distribution in the given size ranges. Find the fly ash emitted in g/s. size efficiency (%) wt% in flue gas 0-5 70 7 5-10 92.5 19 10-20 96 21 20-40 99 24 >40 100 29
- 5. A test run using this coal showed a dry products of combustion analysis by volume of nitrogen equals 82.5%, molecular weight of 30 kg flue gas per mol dry flue gas, and the weight of this dry flue gas is 15.03 kg per kg of coal. The actual ash-pit sample was 0.15 kg per kg of coal, of which 20% was carbon. What is the percentage excess air supplied to the fuel combustion in percent?Q 03: A) What are the major pollutants from the exhaust of SI and CI engines. B) What is the fact that at some speed the volumetric efficiency of an engine is maximum, however it decreases gradually at the start and end.A Methanol pool fire shows a fuel mass loss rate of 0.01 kg/s on a load cell Estimate the heat release rate Assume a combustion efficiency of 08 The heat of combustion of Methanol can be obtained from the text book (Table 76) O A 160 KW O B. 20000 KW OC. 200 kW O D. 16000 kW QUESTION 2 Estimate the heat release rate for a keroene pool fires with a mass loss rate of 0 123 kg/s Assume combustion officiency 08 O A. 2000 KW O B. 200 kW OC 4250 kW OD. 34500 KW QUESTION 3 If the diameter of the kerosene pool fire from the above question (Question 2) is2 m, estimate the flame hoight of the pool fire. O A.04 m OB.4 46 m OCB0M O D. 42m
- 32 - A fixed volume insulated tank, initially empty, was connected to a distribution line carrying helium gas at 115ºC by means of a valve. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 2014.7 kJ/kg B) 649.1 kJ/kg NS) 2118.6 kJ/kg D) 2066.7 kJ/kg TO) 597.1 kJ/kg27.) The following are ways to determine the internal energies and enthalpies of ideal gases EXCEPT: a.By using the tabulated p and v data. b.By using average specific heats. c.By using the tabulated u and h data. d.By using the cv or cp relations and integration 23. The energy equation theta = u + pv+ pe+ ke applies to flowing fluids Select one: True FalseExternal Problem: Fuel, air and combustion Gasoline having a chemical formula CgH17 is burned in an engine at a fuel-air equivalence ratio = 1.19 and a temperature of 1000K. a) Write the stoichiometric combustion equation of the fuel; b) Write the reaction equation corresponding to the given fuel-air equivalence ratio.