Mindblown: a blog about philosophy.
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Example 3.1
A boiler generates 4000 kg/h of steam at 20 bar, 400°C. The feed-water temperature is 50°C. The efficiency of the boiler is 80%. The calorific value of fuel used is 44,500 kJ/kg. The steam generated is supplied to a turbine developing 450 kW and exhausting at 2 bar with dryness fraction 0.96. Calculate the fuel…
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PERFORMANCE OF STEAM GENERATOR
1 Evaporation Rate The quantity of water evaporated into steam per hour is called the evaporation rate. It is expressed as kg of steam/h, kg of steam/h/m2 of heating surface, kg of steam/h/m3 of furnace volume, or kg of steam/kg of fuel fired. Equivalent Evaporation It is the equivalent of the evaporation of 1 kg of water…
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STEAM ACCUMULATORS
Boilers are not always required to supply steam for economic or rated load but also required to meet the fluctuating demand of load, that is, peak fractional load. The boiler takes an appreciable time to change the rate of steam generation but the demand for a considerable change of power may occur instantly if the…
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BOILER ACCESSORIES
These are the appliances installed to increase the overall efficiency of the steam power plant. The various accessories installed are pressure reducing valve, steam trap, steam separator, economiser, air preheater, superheater, feed pump, and injector. The functions of the various accessories are as follows: We shall discuss the air preheater, economiser, and superheater in detail.…
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BOILER MOUNTINGS
Different fittings and devices necessary for the operation and safety of a boiler are called boiler mountings. The various boiler mountings are as follows: 1 Water Level Indicator The water-level indicator indicates the level of water in the boiler constantly. Every boiler is normally fitted with two water-level indicators at its front end. Figure 3.19 shows a…
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Why entropy decreases with the increase in temperature?
Answer: The relation is ds = dQ/T Entropy is inversely proportional to the temperature so as temperature increases, entropy decreases.
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How air conditioners work in cars?
Answer: Air conditioners are based on the principles of evaporation and condensation and then compression and expansion. The hot air of the car is removed by the process of evaporation and then the condensation of the evaporated air takes places which is then further compressed by the compressor and then finally expanded to us in the…
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What will happen if someone adds oil to the fuel of four stroke bike engine?
Answer: This will result in damaging of the engine faster. Adding oil will lead to the higher wear and tear of the cylinder liner, piston and damage to the piston. It will lead to abnormal combustion and knocking and detonation. Dark smoke and abnormal sounds will be generated by the engine. One should not mix oil…
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Why big tyre used in rear of Tractors?
Answer: Tractors have big rear tires because, the larger the surface area of the tractor’s wheels touching the ground, the more pulling power you have. Like how tractor pullers have large tires. Another reason is that the tractor doesn’t have to operate at a higher speed to get the same ground speed with larger tires. Gear…
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What is the difference between BS2 & BS3 engine?
Answer: IN BS2 there is No catalytic converter to reduce formation of co and HC whereas in BS3 catalytic converter is available to reduce the formation of HC and CO. So less mission of HC and co will take place in BS3
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