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Objective Type Questions on Boiler and Auxiliaries

(Answers are marked in   red color ) (1)      The critical pressure ratio of a convergent nozzle is defined as a)       The ratio of outlet pressure to inlet pressure of nozzle b)      The ratio of inlet pressure to outlet pressure of nozzle c)       The ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is minimum d)      The ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is maximum (2)      The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation a)       PV= C b)      P  =C c)       P =C d)      P =C (3)      ...
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Introduction to thermal power plant

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Electricity is everywhere but most of the people does not know how it is produced. Let's introduce about the power generation factory “the thermal power plant”.  Thermal power plant are designed to produce power in the form of voltage and current by using thermal energy. The power is generated by driving a large electrical generator (also called turbo-generator). This generator is driven by a shaft coupled turbine which rotates by using force of steam. Hence, in order to produce the electrical power, our primary concern is to produce steam from water by using thermal energy. This thermal energy is produced by burning fuel (mostly fossil fuels are used) to produce a sufficient amount of heat to generate steam from water. In thermal power plant, there are a number of process are done such as fuel firing, boiling of water, generation of steam, rotation of turbine, generation of voltage etc. These process  need a number of parts, equipment and they are arranged in a definite man...
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Thermal Power Plant Performance

The performance of any thermal power plant depends on so many factors like coal quality, heat rate, cycle efficiency, design etc. The efficiency of any plant is not constant always but reduces years of years. Generally a coal fired thermal power plant efficiently performs for 25 years if all the required maintainance is done time to time.   Heat rate  - “Heat rate is the heat required to generate one unit of electrical energy.” Heat rate in a thermal power plant is measure constitute for its thermal efficiency. The plant output should be higher with minimum heat requirement so we can say that the heat rate must be as low as possible.                         The property of heat generation by fuel/coal depends on the calorific value. Also the CV(Calorific Value) depends on the elemental and non-elemental composition of coal. The analysis of coal composition a...
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