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Monday, 15 December 2014

Difference between Throttle Governing and Nozzle Control Governing

Difference between Throttle Governing and Nozzle Control Governing Points : Difference between Throttle Governing and Nozzle Control Governing, Throttle Governing Vs Nozzle Control Governing, Comparison Throttle Governing and Nozzle Control Governing
Difference between Throttle Governing and Nozzle Control Governing
Throttle Governing
Nozzle Control Governing
1. This governing is usually working in both impulse turbines and reaction turbines. This governing is working in impulse turbine and reaction turbines have initial impulse stages.
2. The control value position will be adjusted to allow required steam for turbine operation. In this process the steam flow is regulated through opening or closing some set of nozzles of the turbine.
3. It has lesser losses due to fractional entrance of steam. It has large partial entrance losses.
4. This governing is realized through throttling of steam at inlet to turbine so there occur severe throttling losses. This governing is realized through nozzle control so degree of throttling losses in valves is small.
5. In this case of governing mechanism, the mass flow rate is controlled by throttling the steam with means of control value. This type of governing is proper for simple impulse turbine and mainly efficiently in part load conditions.

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