Abstract: the orifice meter scale field application in electric power industry information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.
Steaming-water pipe when the power plant according to the requirement of the system does not need to adjust different pressure, but the pipe before and after the pressure difference is bigger, often adopt the way of increase the throttling orifice plate, its principle is: the fluid flow in the pipeline, and as a result of the orifice local resistance, make the fluid.
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Steaming-water pipe when the power plant according to the requirement of the system does not need to adjust different pressure, but the pipe before and after the pressure difference is bigger, often adopt the way of increase the throttling orifice plate, its principle is: the fluid flow in the pipeline, and as a result of the orifice local resistance, reduce the pressure of the fluid, energy loss, the phenomenon known as the throttling phenomena in thermodynamics.
This way is simple than the regulator, but must be properly selected, otherwise, the liquid is easy to produce cavitation phenomenon, affect the safe operation of pipeline.
A cavitation erosion, the role of the throttle orifice flowmeter, it is in the proper place of the pipeline will aperture smaller, when the liquid after reducing, a beam can become thin or contraction.
Beam zui small cross-sectional appear in actual reducing downstream, referred to as contracted flow section.
In the contraction flow section, the velocity is zui, the increase of flow velocity with contracted flow cross section pressure greatly reduced.
When a beam expanded into a larger area, speed to drop, pressure increases, but the downstream pressure will not fully recover to the upstream pressure, this is due to the large internal turbulence and the result of energy consumption.
If contracted flow section corresponding to the pressure of PVC liquid temperature of saturated steam pressure under the pv, in a beam gas escaping steam and dissolved in the water, steam and gas mixture of small bubble formation, the lower the pressure, the more bubbles.
If the downstream of the orifice pressure p2 is still lower than the liquid saturated steam pressure, steam bubble will continue to produce in the downstream piping, steam liquid two phase mixture exists, this kind of phenomenon is the flash.
If the downstream pressure return to higher than the saturated vapor pressure of liquid, steam bubble under the action of high pressure, condensation and quickly burst, at the instant of the bubble burst, produce local hole, high pressure water at high speed to the original bubble occupies a space, to form a wallop.
Due to bubbles of gas and steam to dissolve and condensation in an instant, in under the action of impact and split into small bubbles, and then by high pressure water compression, condensation, so many times repeatedly the formation, and produce a kind of similar to sand flow through the pipeline noise we can imagine, this kind of phenomenon called cavitation.
Runner material surface under the effect of water hammer pressure, formation suffered severe damage and fatigue.
We put the bubble formation, development and rupture of that material damage to all process is called cavitation phenomenon.
The primary difference between flash and cavitation is whether the bubble burst.
Flash phenomenon of pipeline system, due to the medium for soda two phase flow, medium volume and velocity of multiply, scour surface wear is quite severe, its performance for wash surface has a smooth polished appearance.
Flash also generate noise and vibration, but its sound level value is generally below 80 dB, not beyond the permission scope stipulated in the specification.
Cavitation, otherwise, the bubble burst and high-speed impact will cause serious noise, the pipeline vibration, on port a minimal surface area, the impact of formation pressure can be as high as hundreds, even thousands of mpa, impact frequency up to tens of thousands of times per second, in a short period of time can cause scour the severe damage, its performance for wash surface will produce similar to coal cinder of the surface of the crude.
And, by the escape of liquid oxygen and other reactive gas, with the help of a bubble condensation when gives off heat, chemical corrosion of metal.
Flash and cavitation will cause varying degrees of damage to pipeline, adverse to the safe operation of all is, therefore, choose the throttling orifice plate flow timing should avoid the happening of the two cases.
As a result of the downstream of the orifice pressure is often higher than the liquid saturation vapour pressure, therefore, choosing a throttling orifice plate, the main is to prevent the generation of cavitation.
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