Recent questions tagged power-plant-engineering

Description : What is the use of belt conveyors?

Last Answer : Belt conveyors are mostly used for transporting coal over long distance with large quantity. An endless belt is made to run over a pair of end drums and pulleys and supported by series of roller at regular intervals.

Description : Name the different types of coal transforming equipments?

Last Answer : 1. Belt conveyors 2. Screw conveyors 3. Bucket elevators 4. Grab bucket elevators 5. Skip hoists 6. Flight conveyors. The coal transfer starts by carrying of coal from-unloading point to the storage site.

Description : Why the preparation of coal is necessary?

Last Answer : The coal from coal nines cannot be directly fed into the furnace. Proper preparation of coal should be done before feeding the coal to the furnace. In the coal preparation, the coal passes through the different equipments like 1. Crushers 2. Sizers 3. Driers and Magnetic Separators.

Description : Write about inplant handling of-coal?

Last Answer : In order to handle large quantity of coal inside the plant, some mechanical handling systems are provided f6r smooth, easy and better controlled operation. The inplant coal handling is divided, into following categories. • Coal unloading • Coal preparation • Coal transfer • Coal storage

Description : Write about out-plant handling?

Last Answer : Out plant handling includes the handling of coalmine to the thermal power plant. These handlings are outside the plant in the following ways. • Transportation by sea (or) river • Transportation by rail • Transportation by road • Transportation of coal by pipeline.

Description : Name the two types of coal handling?

Last Answer : • Out plant handling • In-plant handling.

Description : State some advantages of fluidised bed boilers?

Last Answer : Any type of fuel - solid, liquid (or) gaseous fuel (or) domestic and industrial waste can be used in FBC system. Any type- of combustible matter can be burned by adjusting the factors ... possible. High combustion efficiency. The solid fuel need not be pulverised in fluidised bed boilers.

Description : Write about fluidised bed boilers?

Last Answer : When the high velocity gas is passed through a packed bed of finely divided solid particles, the particles become suspended in the gas stream and the packed bed becomes a fluidised bed. When ... Bed Combustion. The boiler plant using this fluidised bed combustion is known as fluidised bed boilers.

Description : Write about waste heat boilers?

Last Answer : The waste heat boilers use the waste heat in gases coming out of diesel engines and gas turbines at high temperature (or) use the waste as a fuel in the incineration. Some boilers use the industrial dirty gases for power generation.

Description : What are the waste materials, which can be used for fuel for power generation?

Last Answer : • Municipal waste • Industrial waste • Paper waste • Rubber waste.

Description : Define the term waste heat recovery?

Last Answer : Waste heat is the heat which is not at all used and exhausted out as a waste product. Waste heat is normally available from the industry in the form of process steam and water at high ... industries. This heat can be recovered for useful purpose. This process is known-as waste heat recovery.

Description : Name different methods used to extract steam for heating the feed water?

Last Answer : • Direct contact heater • Drain pump method • All drains to hot well • Cascade system

Description : State some advantages of Regeneration cycle?

Last Answer : • Heat supplied to boiler becomes reduced • Thermal efficiency is increased since the average temperature of heat addition to the cycle is increased. • Due to bleeding in the turbine, erosion of turbine due to moisture is reduced.

Description : Explain the term Regeneration?

Last Answer : Regeneration means heating the feed water by steam taken from the turbine. The steam is exhausted (bled) from the turbine at several locations before exhaust and is supplied to regenerator (feed water heater) to heat the feed water.

Description : Define bleeding in steam power plant?

Last Answer : Assume I kg of steam is expanded in the turbine. Before complete amount of steam -is expanded, some amount of steam (m kg) is -extracted ' Extracting the steam in the turbine before exhaust is called bleeding. This bled steam is used to heat the feed water.

Description : Name different methods of reheating?

Last Answer : (a) Gas Reheating (b) Live - steam reheating (c) Combined gas live steam reheater.

Description : What are the important advantages of Re-heating?

Last Answer : • Due to reheating, network done increases • Heat supply increases • Thermal efficiency increases • Due to reheating, the turbine exit dryness fraction increases so moisture decreases - so blade erosion becomes minimum - so life of the turbine will be increased.

Description : Explain Reheat cycle?

Last Answer : If the dryness fraction of steam leaving the turbine is less than 0.88, then, corrosion and erosion of turbine blades occur. To avoid this situation, reheat is used. In the reheat cycle, the ... turbine first, and then it is reheated. The reheated steam is again expanded in. the LP turbine.

Description : Write about Loeffler boiler?

Last Answer : The major disadvantage in La Mont boiler is the deposition of salt and sediment on the inner surface of the water tubes. It reduces the heat transfer and ultimately the steam generating capacity. ... by preventing water from flowing through the boiler tubes. The steam is generated outside the tubes.

Description : Write about Benson boiler? State some important advantages of Benson boiler?

Last Answer : Benson boiler is the high pressure, vertical fire tube boiler. This boiler has no drum and is ~designed to operate at critical pressure of 225 bar. Benson boiler has no drum. So the total weight of ... by-20%, when compared to other boilers. o The erection of Benson boiler is easier and quicker.

Description : Write about La Mont boiler? What is the major disadvantage of La Mont boiler?

Last Answer : La Mont boiler is a forced circulation high pressure water tube boiler. The major disadvantage is the formation of bubbles, salt and sediment on the inner surfaces of the heating surfaces. This reduces the heat flow and steam generation.

Description : Name important high pressure boilers?

Last Answer : • La Mont boiler • Benson boiler • Loeffler boiler • Velox boiler.

Description : State important advantages of high-pressure boilers?

Last Answer : • The amount of scale formation is less, since the velocity of water through pipes are more. • All parts of the system are heated uniformly, so there is no danger of overheating.

Description : What is the main purpose of high-pressure boilers?

Last Answer : The high-pressure boilers are used to increase the efficiency of the plant and to reduce the cost of electricity production.

Description : Define turbo charging in combined gas turbine and diesel cycles?

Last Answer : In the combined cycle, the exhaust gas from the diesel engine is expanded in the turbine, which is coupled with compressor which supplies pressurized air to the diesel engine. This increases diesel engine output. This arrangement is known as turbo charging.

Description : Name two combined power cycles?

Last Answer : • Combined cycle of gas turbine and steam power plant. • Combined cycle of gas turbine and diesel power plant.

Description : What is the purpose of intercooler in gas turbine power plant?

Last Answer : Since the power required to compress the air is less in isothermal process it is required to maintain the, temperature of air constant as far as possible. Hence the air leaving the L.P. compressor is cooled by intercooler and then passed to the H.P compressor.

Description : What consists of lubrication system in diesel engine power plant?

Last Answer : The lubrication system consists of oil pumps, oil tanks, filters, coolers and connecting pipes. The purpose of the lubrication is to reduce the friction of moving parts and also pipes to reduce the wear and tear of moving parts.

Description : What is the function-of cooling system in Diesel power plant?

Last Answer : The function of cooling system is to remove heat from the engine cylinder to keep the temperature of the cylinder in low range and extend engine life.

Description : What is the use of draft tube?

Last Answer : The draft tube is used to regain the kinetic energy of water coming out of reaction turbine. It enables the reaction turbine to be placed over tailrace level.

Description : What are the uses of air filter and superchargers in diesel engine power plant?

Last Answer : The purpose of air filter is to filter the air from dust and other suspended particles. The purpose of super charger is to increase the pressure of the engine to increase power of the engine.

Description : Write about prime movers?

Last Answer : Prime mover converts the kinetic energy of water into mechanical energy to produce electrical energy. Pelton wheel, turbine, Francis turbine, Kaplan turbine and Propeller turbine are prime movers used in hydraulic power plants.

Description : What is the use of spill Ways?

Last Answer : Spillway is like a safety valve of the dam. It discharges major flood without damaging the dam. It keeps the reservoir level below the maximum level allowed.

Description : Explain about penstock?

Last Answer : The pipe between surge tank and prime mover is known as penstock. It is designed to withstand high pressure. It is made up of reinforced concrete. In very cold areas, the penstock is buried to prevent ice formation and to reduce the expansion joints.

Description : What is the function of Fore bay?

Last Answer : Fore bay is considered as naturally provided surge tank. It is temporary water storage when the load on the plant is reduced and provides water for initial increment on increasing load.

Description : What is the use of surge tank?

Last Answer : The surge tank is used to provide better regulation of water pressure in the system. The surge tank controls the water when the load on the turbine decreases and supplies water when the ... variations resulting from the rapid changes in water flow in penstock and hence prevents water hammer.

Description : Why trash rack is used?

Last Answer : The trash rack is used to prevent the entry of debris, which might damage the turbine runners and chock up the nozzle of impulse turbine.

Description : What is the main purpose of the dam?

Last Answer : The main purpose of the dam is to increase the height of water level and also to increase the working head of the hydraulic power plant.

Description : What is the main purpose of the reservoir?

Last Answer : The main purpose of reservoir is to store water received from catchments areas during the rainy seasons and supply the same during the dry season.

Description : What consists of cooling water circuit and coal & ash circuit in steam power plant?

Last Answer : The cooling water circuit consists of a pump, condenser and cooling tower. The coal and ash circuit consists of coal delivery, preparation of coal, handling of coal to the boiler furnace, ash handling and ash storage.

Description : What consists of feed water and steam flow circuit in steam power?

Last Answer : The feed water and steam flow circuit consists of feed pump, economiser boiler drum super heater, turbine and condenser.

Description : What consists of air and flue gas circuit?

Last Answer : Air and flue gas circuit consists of forced draught fan, air-pre-heater, boiler, furnace, super heater, economiser, dust collector, induced draught fan and chimney.

Description : Name the four major circuits in steam power plant.

Last Answer : • Coal and ash circuit • Air and flue gas circuit • Feed water and steam circuit • Cooling water circuit