State the term governing of turbine and explain nozzle control governing.

State the term governing of turbine and explain nozzle control governing.
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1 Answer

Answer :

Governing of turbine: The function of governor is to regulate the supply of steam to the turbine so that the speed of rotation shall remain constant at all loads.

Nozzle control governing:

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The arrangement of nozzle control governing is shown in figure. The poppet type valve uncover as many steam passages as necessary to meet the load, each passage serving a group of nozzle. The control governor has the advantage of using steam at full boiler pressure. The nozzles are divided into three groups N1, N2 and N3 and the control valves V1, V2 and V3 controls the amount of steam supply to each nozzle group respectively. The number of nozzle group may vary from three to five or more. Various arrangements of group nozzles and valves can be employed. Two arrangements are shown in figure (b) & (c). Under full load condition all the regulating valve are opened. When the load on the turbine is reduced the supply of steam to a group nozzle is shut off

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