Nozzle Governing Of Steam Turbine Ppt

02 the steam turbine develops power at a uniform rate and hence does not required flywheel.

Nozzle design with number. A governor is used for achieving this purpose which regulates the supply of steam to the turbine in such a way that the speed of the turbine is maintained as far as possible a constant under varying load conditions. Hp turbine has nozzle governing all four control valves open in preset sequence. Governing of turbines governing is the method of maintaining the speed of the turbine constant irrespective of variation of the load on the turbine.

In a practical situation the load frequently varies from the designed or economic load and thus there always exists a considerable deviation from the desired performance of the turbine. Extraction pressure regulating system 5. In throttle governing the pressure of steam is reduced at the turbine entry thereby decreasing the availability of energy.

These nozzles are actuated by independent control mechanisms. The various methods of governing of steam turbines are. Ip turbine has throttle governing all four control valves open simultaneously.

Since no regulation to the pressure is applied the advantage of this method lies in the exploitation of full boiler pressure and temperature. Vanita thakkar bit 17 nozzles a nozzle is a device a duct of smoothly varying cs area that increases the velocity of a fluid at the expense of pressure. Steams flow rate is also controlled by these nozzles.

Figure 2 shows the mechanism of nozzle governing applied to steam turbines. Steam turbine governing is the procedure of controlling the flow rate of steam to a steam turbine so as to maintain its speed of rotation as constant. In actual turbine nozzle governing is applied only to the first stage whereas the subsequent stages remain unaffected.

In nozzle governing the flow rate of steam is regulated by opening and shutting of sets of nozzles rather than regulating its pressure. The methods used for governing the steam turbines are. Over speed tripping systememergency governor.

Nozzle control governing of steam turbine is basically used for part load condition. 1 throttle governing 2 nozzle governing 3 by pass governing 4. Operation of stop control valves and crh check valves are done by spring type hydraulic.

Combination of throttle nozzle governing. Nozzle governing mechnism of steam turbine this type of governing is suitable for simple impulse turbine and most efficiently in part load conditions. Some set of nozzles are grouped together may be two three or more groups and each group of the nozzle is supplied steam controlled by valves.

The primary objective in the steam turbine operatio. 01 thermal efficiency of a steam turbine is much higher than that of a steam engine. In this method the steam flow is regulated by opening or closing some set of nozzles of the turbine.

Advantages of steam turbines. 04 in a steam turbine there is no. Resetting of turbine is done by control gear operation.

03 if the steam turbine is properly designed and constructed then it is the most durable prime mover. Every valve is closed by the corresponding set of nozzle.