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Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.
In order to burn a fuel completely, which of the following basic conditions must be fulfilled? 1. Supply enough air for complete combustion of fuel. 2. Secure low turbulence for thorough mixing of fuel and air. 3. Maintain a furnace temperature high enough to ignite the incoming fuel air mixture. 4. Provide a furnace volume large enough to allow time for combustion to be completed. Select the correct answer using the code given below:
Which of the following are essential for a good combustion chamber of turbojet engine? 1. It should allow complete combustion of fuel. 2. It should maintain sufficiently high temperature in the zone of combustion in addition to proper atomization of fuel thus leading to continuous combustion. 3. It should not have high rate of combustion. 4. The pressure drop should be as small as possible
A 15kg of air is supplied per kg of fuel burnt to the combustion chamber of a boiler using fuel 600kg/hr. the temperature of flue gases and ambient air are 273°C and 32°C. If the minimum draught required to start the flue is 9.5mm of water, find out the minimum height of the chimney?
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
In the question below are given three statements followed by three conclusions numbered I, II and III. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts. Statements: Some Oil are Wax. All Gases are Oil. Some Fuel are Gases. Conclusions: I. No Fuel is an Oil. II. No Gases is a Fuel. III. Some Oil are Fuel.
Determine the height of chimney above grate level. Where diameter of chimney is 1.75m and produces a draught of 1.8cms of water. Temperature of flue gases is 290oC. The flue gases formed per kg of fuel burnt are 23kg. Neglect the losses and assume atmospheric temperature as 20oC?
Efficiency of the combustion of a fuel is judged by the __________ the flue gas.
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas.
A solid-oxide fuel cell is fed with carbon monoxide and reacts with air to produce CO2. This reaction will produce 2 electrons which are used to power an electric circuit external to the fuel cell. The reaction equation is shown below: 2CO(g) + O2(g) -> 2CO2(g) ΔHr° = -565.96 kJ/mol This reaction does not occur for other types of fuel cells which use a catalyst, such as polymerelectrolyte membrane or phosphoric-acid fuel cells. The presence of carbon monoxide on the anode side of these types of fuel cells will cause catalyst poisoning, reducing the efficiency and voltage of the fuel cell. Determine the rate of enthalpy change for a carbon dioxide production rate of 208 mol/hr. The extent of the reaction occurring in the fuel cell can be obtained by the following equation: where: