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What is the effect of silica on steam turbine blades?
Although several factors influence the formation of deposits on turbine components, the general effect is the same no matter what the cause. Adherent deposits form in the steam passage, distorting the original shape of turbine nozzles and blades. These deposits, often rough or uneven at the surface, increase resistance to the flow of steam. Distortion of steam passages alters steam velocities and pressure drops, reducing the capacity and efficiency of the turbine. Where conditions are severe, deposits can cause excessive rotor thrust. Uneven deposition can unbalance the turbine rotor, causing vibration problems.The nature of silica deposits found on turbine blades varies greatly. lists a number of silica compounds that have been identified in various studies of turbine blade deposition. Of these, amorphous silica (SiO2) is the most prevalent.Localized Silica Saturation. Turbine deposits are also formed where localized silica saturation occurs and silica condenses from the steam in those areas of the turbine. Partial evaporation of the precipitated silica can then occur with only a portion of the silica being dissolved by the continuous steam flow. Deposits remain as a result.Turbine Velocity. Another factor affecting the location of turbine deposits is the velocity in the turbine. Steam flows from the inlet to the outlet of the turbine in only a fraction of a second. Consequently, deposition is shifted downstream from the saturation point by the high steam velocities.Prevention of Silica DepositsThe most significant factor in minimizing turbine silica deposits is the maintenance of low silica concentrations in the boiler water. External treatment equipment must be operated carefully to limit the amount of silica entering with the makeup water, and the condensate must be monitored to minimize contamination. After silica enters the boiler water, the usual corrective action is to increase boiler blowdown (to decrease the boiler water silica to acceptable levels) and then to correct the condition that caused the silica contamination.
What causes saturation in a welding transformer?
what causes saturation in welding machine
What is difference between radial flow turbine and axial flow turbine?
in a radial flow turbine the steam enters the turbine in the direction of its radius and leaves it in the direction of the axis of the shaft. in a axial flow turbine the steam enters the turbine in the direction of the axis of the shaft and leaves the turbine in the same direction.
How do you spell turbine?
Turbine is the correct spelling.
Why would you not heat the steam coming out of turbine and feedback to turbine?
becouse this steam is use repetdly for the turbine
Why can sodium Thiosulfate reach super saturation Is it something to do with hydrates?
a precipitate is formed. a precipitate is formed.
What is super saturation?
Supersaturated = Being more concentrated than normally possible and therefore not in equilibrium.
Why alcohol used in the limit test for sulphate?
Alcohol helps to prevent super saturation.
How can you improve the yield of barium sulphate in a gravimetric analysis?
make barium sulphate to undergo super saturation...
What is the function of superheater?
The function of the super heater is to increase the temperature of the steam above saturation by utilising the heat from the flue gases.
Are there any harmful effects of super beta prostates?
I did some research, and there do not appear to be any harmful effects of Super Beta Prostates. It is a natural supplemant that has shown either positive effects or no effects at all.
What does a input-turbine speed sensor circuit malfunction do?
it effects your transmission. If the input-turbine is not working properly, it will make your car transmission slip. It is very bad on your car to run it with the input turbine malfunctioning. It is not that pricey to get fixed. It costs around $260.00 with tax and labor.
What does a input turbine speed sensor circuit malfunction do?
it effects your transmission. If the input-turbine is not working properly, it will make your car transmission slip. It is very bad on your car to run it with the input turbine malfunctioning. It is not that pricey to get fixed. It costs around $260.00 with tax and labor.
What is concrete super P?
Super P stands for super plasticizers. They are a chemical admixture added to the concrete to make the concrete extremely workable. The effects of super P are only temporary (15-60minutes). Its effects are reduced in high temperatures.
Which bike is fastest?
MTT streetfighter super bike, 227+mph stock. 420hp jet turbine enigine. $175K
What is the Ill effects of excess irrigation on soil?
Water loggingBreeding place of mosquitosGround water table is increasedComplete saturation of root zone causes efflorescence.
What is the effect of silica on steam turbine blades?
Although several factors influence the formation of deposits on turbine components, the general effect is the same no matter what the cause. Adherent deposits form in the steam passage, distorting the original shape of turbine nozzles and blades. These deposits, often rough or uneven at the surface, increase resistance to the flow of steam. Distortion of steam passages alters steam velocities and pressure drops, reducing the capacity and efficiency of the turbine. Where conditions are severe, deposits can cause excessive rotor thrust. Uneven deposition can unbalance the turbine rotor, causing vibration problems.The nature of silica deposits found on turbine blades varies greatly. lists a number of silica compounds that have been identified in various studies of turbine blade deposition. Of these, amorphous silica (SiO2) is the most prevalent.Localized Silica Saturation. Turbine deposits are also formed where localized silica saturation occurs and silica condenses from the steam in those areas of the turbine. Partial evaporation of the precipitated silica can then occur with only a portion of the silica being dissolved by the continuous steam flow. Deposits remain as a result.Turbine Velocity. Another factor affecting the location of turbine deposits is the velocity in the turbine. Steam flows from the inlet to the outlet of the turbine in only a fraction of a second. Consequently, deposition is shifted downstream from the saturation point by the high steam velocities.Prevention of Silica DepositsThe most significant factor in minimizing turbine silica deposits is the maintenance of low silica concentrations in the boiler water. External treatment equipment must be operated carefully to limit the amount of silica entering with the makeup water, and the condensate must be monitored to minimize contamination. After silica enters the boiler water, the usual corrective action is to increase boiler blowdown (to decrease the boiler water silica to acceptable levels) and then to correct the condition that caused the silica contamination.
