On what factors efficiency (thermal) of the steam plant depends?

On what factors efficiency (thermal) of the steam plant depends?
by

1 Answer

Answer :

Efficiency of the thermal plant depends on three factors, they are
pressure of steam entering the turbine
temperature of the steam entering the turbine
pressure in the condenser
Thermal efficiency increases with increase in temperature and pressure of the steam entering the turbine. For this reason high temperature and pressure are used. Thermal efficiency is effectively increased by decreasing the pressure in the condenser, so pressure in the condenser is kept as low as possible.
Thermal efficiency also increases by reheating the steam between turbine stages
by

Related questions

Why the Thermal efficiency of the steam power plant is quite low?

Description : Why the Thermal efficiency of the steam power plant is quite low?

Last Answer : In Steam power station, more than 50% of the total heat of combustion is lost as heat rejected to the condenser and the loss is unavoidable as the heat energy cannot be converted in to mechanical ... lowest temperature. This is the reason that the thermal efficiency of the power plant is quite low.

What is the overall efficiency of the Thermal Power Plant or Steam Power Plant?

Description : What is the overall efficiency of the Thermal Power Plant or Steam Power Plant?

Last Answer : Overall efficiency of the system is defined as the ratio of heat equivalent of electrical output to the heat of combustion. Generally Overall efficiency of the steam plant will always be ... by multiplying the thermal efficiency of the plant with efficiency of the generator (electrical efficiency)

What is the Thermal efficiency of steam power plant?

Description : What is the Thermal efficiency of steam power plant?

Last Answer : Thermal efficiency of steam power plant is defined as the ratio of heat equivalent of mechanical energy transmitted to the turbine shaft to the heat of combustion. Generally Thermal efficiency of the steam power plant will be in the range of 30-35%

What are different types of Steam boilers used in Thermal Power Plants?

Description : What are different types of Steam boilers used in Thermal Power Plants?

Last Answer : Different type of boiler used in thermal power plants are: Fire tube boiler Water tube boiler Natural Circulation boiler Forced Circulation boiler Once through boiler

List the factors to be considered while choosing a site for steam power station:

Description : List the factors to be considered while choosing a site for steam power station:

Last Answer : 1.Supply of fuel 2.Availability of water 3.Transportation facilities 4.Cost and type of land 5.Nearness to load centres 6.Distance from populated area

Steam power plant works on which cycle?

Description : Steam power plant works on which cycle?

Last Answer : Steam power plant works on the principle of Rankine Cycle

Why cooling towers require in the Steam power plant ?

Description : Why cooling towers require in the Steam power plant ?

Last Answer : Cooling towers cool the warm water discharged from the condenser and feed the cooled water back to the condenser. There are two types of cooling methods provided in the cooling towers, they can be either ... finned tubes over which cooling air is passed. Heat is rejected to air as water is cooled

What is the purpose of deaerator in steam power plant?

Description : What is the purpose of deaerator in steam power plant?

Last Answer : The presence of dissolved gases like oxygen and carbon dioxide in water makes the water corrosive, as they react with metal and forms iron oxide. The solubility of the gases in the water ... deaerator by heating the feed water to saturation temperature through the bled steam from the turbine.

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

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.

Name the four major circuits in steam power plant.

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

What are different types of circuit breakers employed in thermal power plant?

Description : What are different types of circuit breakers employed in thermal power plant?

Last Answer : For low voltage operation 415/220V vacuum circuit breakers or air break circuit breakers are employed. For voltage ratings about 6.6kV and beyond SF6 circuit breakers are employed.

How Generator Transformer is cooled in Thermal Power Plant?

Description : How Generator Transformer is cooled in Thermal Power Plant?

Last Answer : MVA power rating of the Generator Transformer will be equal to the alternator. Hence lot of heat will be generated while generator transformer is under operation. Oil Forced Air Forced (OFAF) type of cooling is employed for generator transformer

What are the major electric systems in Thermal Power Plant?

Description : What are the major electric systems in Thermal Power Plant?

Last Answer : Major electrical equipment in thermal power plant are Turbine Generator Exciter System Generator Protection System Generator Transformer HT/LT switch gear Electrical Switch-yard

What are the main circuits in the Thermal Power Plant?

Description : What are the main circuits in the Thermal Power Plant?

Last Answer : Thermal Power plant consists of four main circuits, they are: Feed water and steam flow circuit Coal and ash circuit Air and gas circuit Cooling water circuit

Explain the working of thermal power plant.

Description : Explain the working of thermal power plant.

Last Answer : It uses coal as the primary fuel to boil the water available to superheated steam for driving the steam turbine. The steam turbine is then mechanically coupled to an alternator rotor, the rotation of which results in the generation of electric power.

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

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, economizer boiler drum super heater, turbine and condenser.

What are the different Generator Protections employed in Thermal Power Plants?

Description : What are the different Generator Protections employed in Thermal Power Plants?

Last Answer : Faults in the windings, Over load protection, Over heating of windings or bearings, Over speed protection, Loss of Excitation protection, Motoring operation protection, Inadvertent energisation ... , out of step operation protection, sub-synchronous oscillations protection and earth fault protection

Why Thermal Power Plants are always situated by the side of rivers or lakes?

Description : Why Thermal Power Plants are always situated by the side of rivers or lakes?

Last Answer : Thermal Power Plants are situated close to the rivers or lakes because to meet the large quantity of the water requirement. Water is required in the steam power plants steam in the boiler for cooling purposes such as in condensers as carrying medium such as in disposal of ash for drinking purpose

Define draught, what is the use of draught in thermal power plants?

Description : Define draught, what is the use of draught in thermal power plants?

Last Answer : Draught is defined as a small pressure difference required between the fuel bed (furnace) and outside air to maintain constant flow of air and to discharge the gases through chimney to the atmosphere. ... combustion products through the system. · To remove burnt products from the system

What type of cooling is provided for Generator in power plant?

Description : What type of cooling is provided for Generator in power plant?

Last Answer : Hydrogen gas cooling is employed for large size generators because of better heat carrying ability of the hydrogen. Hydrogen cooling is provided for rotors and core of the generator. Water cooling is provided for the stator of the alternator.

Why are feed water heaters are used?

Description : Why are feed water heaters are used?

Last Answer : Regenerative Feedwater heaters are employed in steam power plants to improve the cycle efficiency. Also it increases the steam flow rate and reduces the steam flow to the condenser. They raise the temperature of the feed water before it enters the economizer

Write about classification of draught?

Description : Write about classification of draught?

Last Answer : Draught is classified as 1. Natural draught 2. Artificial draught

What is the working principle of Cooling Towers?

Description : What is the working principle of Cooling Towers?

Last Answer : The hot water is sprayed from the top of the tower, while the air is made to flow from the bottom of the tower to the top. This air cools the hot water in the cooling tower. Air vaporises ... and leaves at the top of the tower and cooled water leaves at the bottom and recirculated to the condenser.

List the types of super heaters:

Description : List the types of super heaters:

Last Answer : 1. Radiant super heater- absorb heat by radiation 2. Convention super heater-absorb heat via a fluid 3. Separately fixed super heaters- it is totally separated from the boiler

What is meant by cooling Towers?

Description : What is meant by cooling Towers?

Last Answer : It is a tower or building like device in which atmospheric air circulates in direct or indirect contact with warmer water and water is thereby cooled. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid

What consists of air and flue gas circuit?

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, economizer, dust collector, induced draught fan and chimney.

What is the function of Air preheater?

Description : What is the function of Air preheater?

Last Answer : Air pre heater is used to transfer heat from the flue gases to the air before it passes into the furnace for combustion thereby increasing the thermal efficiency of the process.

What is an Economizer?

Description : What is an Economizer?

Last Answer : An economizer is a mechanical device which is used as a heat exchanger by preheating water by recovering residual heat from the flue gases in thermal power plant.

What is superheater?

Description : What is superheater?

Last Answer : A superheater is a device used to convert saturated steam or wet steam into dry steam

Why the preparation of coal is necessary?

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.

The efficiency of a thermal power plant improves with (A) increased quantity of coal burnt (B) larger quantity of water used (C) lower load in the plant (D) use of high steam pressures.

Description : The efficiency of a thermal power plant improves with (A) increased quantity of coal burnt (B) larger quantity of water used (C) lower load in the plant (D) use of high steam pressures.

Last Answer : Ans: D

Ratio of actual indicated work to hypothetical indicated work in a steam engine is the (a) Indicated thermal efficiency (b) Friction factor (c) Mechanical efficiency (d) Diagram factor

Description : Ratio of actual indicated work to hypothetical indicated work in a steam engine is the (a) Indicated thermal efficiency (b) Friction factor (c) Mechanical efficiency (d) Diagram factor

Last Answer : Ans : d

Steam distillation is used to (A) Reduce the number of plates (B) Avoid thermal decomposition of a component (C) Increase the efficiency of separation (D) Increase the total pressure of distillation

Description : Steam distillation is used to (A) Reduce the number of plates (B) Avoid thermal decomposition of a component (C) Increase the efficiency of separation (D) Increase the total pressure of distillation

Last Answer : (B) Avoid thermal decomposition of a component

Which of the following has the least thermal efficiency? (A) Steam engine (B) Carnot engine (C) Diesel engine (D) Otto engine

Description : Which of the following has the least thermal efficiency? (A) Steam engine (B) Carnot engine (C) Diesel engine (D) Otto engine

Last Answer : A) Steam engine

The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler. (A) Evaporative capacity (B) Evaporation efficiency (C) Thermal efficiency (D) Steam load

Description : The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler. (A) Evaporative capacity (B) Evaporation efficiency (C) Thermal efficiency (D) Steam load

Last Answer : (A) Evaporative capacity

Boiler efficiency is a measure of how effectively _______ energy in fuel is converted into heat energy in steam going to the turbines A Chemical energy B Heat energy C Thermal energy D All of the above

Description : Boiler efficiency is a measure of how effectively _______ energy in fuel is converted into heat energy in steam going to the turbines A Chemical energy B Heat energy C Thermal energy D All of the above

Last Answer : A Chemical energy

Overall thermal efficiency of a steam power station in India is in the range:

Description :  Overall thermal efficiency of a steam power station in India is in the range: A) 18-24 percent B) 30-40 percent C) 44-62 percent D) 68-79 percent

Last Answer :  Overall thermal efficiency of a steam power station in India is in the range: 30-40 percent 

The heat recoverable from flue gases of furnaces depends on the (A) Thermal efficiency of furnace (B) Quantity of flue gases (C) Flue gas temperature drop through the furnace (D) All (A), (B) and (C)

Description : The heat recoverable from flue gases of furnaces depends on the (A) Thermal efficiency of furnace (B) Quantity of flue gases (C) Flue gas temperature drop through the furnace (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

The thermal efficiency of a diesel cycle having fixed compression ratio with increase in cut-off ratio will a. increase b. decrease c. independent d. increase or decrease depending upon other factors

Description : The thermal efficiency of a diesel cycle having fixed compression ratio with increase in cut-off ratio will a. increase b. decrease c. independent d. increase or decrease depending upon other factors

Last Answer : ANSWER b. decrease

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle  (a) more  (b) less  (c) equal  (d) depends on other factors  (e) none of the above.

Description : If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle  (a) more  (b) less  (c) equal  (d) depends on other factors  (e) none of the above.

Last Answer : Answer : c

For same compression ratio and for same heat added  (a) Otto cycle is more efficient than Diesel cycle  (b) Diesel cycle is more efficient than Otto cycle  (c) efficiency depends on other factors  (d) both Otto and Diesel cycles are equally efficient  (e) none of the above.

Description : For same compression ratio and for same heat added  (a) Otto cycle is more efficient than Diesel cycle  (b) Diesel cycle is more efficient than Otto cycle  (c) efficiency depends on other factors  (d) both Otto and Diesel cycles are equally efficient  (e) none of the above.

Last Answer : Answer : a

State two factors on which efficiency of cooling tower depends.

Description : State two factors on which efficiency of cooling tower depends.

Last Answer : Efficiency of cooling tower depends on 1.Losses in duct, piping and joints, pipes should be free from scale/rust 2.Efficient heat transfer, maintenance of piping , Ensure fill is clean and free of debris. 3.Sufficient airflow and correct fan speed. 

State any six factors on which efficiency of lighting depends.

Description : State any six factors on which efficiency of lighting depends.

Last Answer : 1) Level of illumination or degree of illumination: It depends on nature of work to be carried out. The degree of level of illumination also depends on following factors. i) The size of ... Distribution of lux on working plane: The lux level on working plane should be uniformly distributed.

Steam pressures usually used in thermal power plants are (A) 5 kg/cm2 to 10 kg / cm2 (B) 50 kg/cm2 to 100 kg / cm2 (C) 110 kg/cm2 to 170 kg / cm2 (D) 200 kg/cm2 to 215 kg / cm2

Description : Steam pressures usually used in thermal power plants are (A) 5 kg/cm2 to 10 kg / cm2 (B) 50 kg/cm2 to 100 kg / cm2 (C) 110 kg/cm2 to 170 kg / cm2 (D) 200 kg/cm2 to 215 kg / cm2

Last Answer : Ans: C

What are different types of Steam boilers used in Thermal Power Plants?

Description : What are different types of Steam boilers used in Thermal Power Plants?

Last Answer : Answer: Different type of boiler used in thermal power plants are: • Fire tube boiler • Water tube boiler • Natural Circulation boiler • Forced Circulation boiler • Once through boiler

When the efficiency of the alternator is maximum or on what factor the efficiency of the alternator depends?

Description : When the efficiency of the alternator is maximum or on what factor the efficiency of the alternator depends?

Last Answer : Efficiency of an alternator depends on its load power factor for a given load. As the power factor decreases Ia increases and the copper losses increases and thus efficiency decreases. The efficiency for ... is maximum only when the power factor is unity and it decreases as the power factor fall.

Factors on which soil resistance depends: a) depth of the electrode b) moisture c) Nacl d) all the above

Description : Factors on which soil resistance depends: a) depth of the electrode b) moisture c) Nacl d) all the above

Last Answer : Ans: D

Factors on which material of station busbar depends?

Description : Factors on which material of station busbar depends?

Last Answer : Some of the factors on which station busbar depends are: Current Carrying capacity Short Circuit Stresses Establishing minimum electrical clearances

Mention the factors on which hysteresis loss depends?

Description : Mention the factors on which hysteresis loss depends?

Last Answer : (i) Quality and amount of iron in the core (ii) Flux density and (iii) Frequency.

What are the factors on which the capacity of the battery depends?

Description : What are the factors on which the capacity of the battery depends?

Last Answer : The capacity of the battery is measured in ampere-hour. The capacity of the battery depends upon the following factors. a. Number and area of the positive plate. b. Discharge voltage ... . Temperature. When the temperature increases the resistance of the battery decreases and the capacity increases.