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You can solve hunting, or oscillatory instability, in a closed loop control system by adding feedback damping, in the form of high pass negative feedback of actuator input to sense input. This slows the actuator, and gives the controlled system more time to respond. You can overdo it, however, and make the controlling system sluggish. Its a matter of finding the sweet spot, technically the critical damping point, where you have the best compromise between underdamping and overdamping.
This answer is not specific to turbine main steam control valves. It addresses the more general case of closed loop servo systems. If someone has a more specific answer to the question, please feel free to refine the answer
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What is the effect of steam turbine control valve throttling in turbine efficiency?
In Boiler follow turbine mode , Boiler produces a constant pressure behind throttling valve and throttling valve adjusts necessary pressure and required steam as High Pressure steam for entering the turbine . In Valves Wide Open (VWO) mode the efficiency is maximum and we haven't any loss. (It's nearly 106% Turbine MCR) . In Turbine MCR , we have a little loss and consequently a little bit worse heat rate . In partial load , loss is more and efficiency worse.
What is the use of a turbine in refrigeration?
It is used as a compressor. It has the same advantages over a piston compressor as a gas turbine engine has over a piston engine. i.e. no valves, much lower part count and much greater efficiency.
Why is the runaway speed of a hydraulic turbine always kept twice its normal speed?
The runaway speed of a hydraulic turbine is the speed at which the turbine coupled to the generator runs at the maximum possible speed due to loss of load and this happens until the shut off valves completely closes the discharge from the penstock. the runaway speed of the turbine is determined by the turbine designer and is influenced by the maximum discharge of water from the penstock, the combined inertia of the turbine runner and the generator and the flywheel. this factor can vary from 1.5 up to 3 times the nominal speed of the turbine and is determined by the turbine designer considering all the load parameters.
What is turbine lube oil conditioner?
It is oil used to lubricate the bearings on the turbine. Typically designated AW32 oil, it is a high purity clear amber 300 ssu viscosity mineral oil with anti-wear additives. It is also used to operate the turbine's controls, such as the governor, trip mechanisms and admission valves.
What is priming in the marine boiler?
Priming is a carryover of entrained water with the steam into the engines that affect the turbine blade, break cylinder heads, piston, valves.
What is turbine drain valve?
When steam is introduced to a turbine during start up, drain valves are fully open. They drain to the condenser until the turbine reaches a certain load. Once that load is reached, the valves are closed and turbine runs normally.
Why lp heater have no qcnrv?
non-return valves of swing check type provided with a forced closing mechanism. They are installed in turbine extraction lines. The purpose of these valves is to prevent the back flow of heavy specific weight and low temperature steam to turbine during a turbine trip
Cadillac Seville stalls sputters hesitates?
can you tell me if this problem is with a idle air valves control on this Cadillac Seville sls 1996
What exactly does the diagnostic code P1751 mean on your 2002 Honda Accord lx?
Mechanical Problem in Hydraulic Control System of Shift Solenoid Valve B and A/T Clutch Pressure Control Solenoid Valves A and B, or Problem in the Hydraulic Control System Comprehensive.
What is the effect of steam turbine control valve throttling in turbine efficiency?
In Boiler follow turbine mode , Boiler produces a constant pressure behind throttling valve and throttling valve adjusts necessary pressure and required steam as High Pressure steam for entering the turbine . In Valves Wide Open (VWO) mode the efficiency is maximum and we haven't any loss. (It's nearly 106% Turbine MCR) . In Turbine MCR , we have a little loss and consequently a little bit worse heat rate . In partial load , loss is more and efficiency worse.
What do modulating control valves do?
What does a modulating pressure control do
What does a valves do?
Valves in general control the flow of something. They serve as regulators.
Do the aortic and pulmonary valves control the flow of the blood into the heart?
No, semilunar valves control the flow of blood out of the heart.
What exactly does the diagnostic code P1751 mean on your 2000 Honda Accord?
Trouble code P1751 means: Mechanical Problem in Hydraulic Control System of Shift Solenoid Valve B and A/T Clutch Pressure Control Solenoid Valves A and B, or Problem in the Hydraulic Control System Comprehensive
Which website offers flow control valves at a discount for plumbers?
The Valve Shop has a large selection of flow valves. They also have air, ball, control and butterfly valves. The store's website is http://www.thevalveshop.com/
How many types of control valves?
26
What position should control valves be in?
open
