Abstract
In this paper an analysis of the three different calculation methods for the steam mass flow through the linear pressure reduction valve is presented. Two different makers developed their own mass flow calculation method while one is following recommendation as per ISO standard calculation guidance. All three methods were varied and compared. For calculation model a superheated steam reduction valve was taken, which is reducing superheated steam pressure from 6 to 2 MPa, with fixed Kv value and with variations of the inlet superheated steam temperature from 310 to 280 °C.
Highlights
Steam pressure reduction valves have wide usage in stationary thermal and process plants, and in the marine propulsion plants [1]
The purpose of reducing the steam pressure is that steam enters to mentioned heaters close to the saturated point as there is no need for such elements to work at higher pressures and where is possible for saturated or slightly superheated steam to convert from steam to condensate
Superheated steam is analysed in this paper in order to avoid saturated phase area
Summary
Steam pressure reduction valves have wide usage in stationary thermal and process plants, and in the marine propulsion plants [1]. Reducing steam pressure from the main boiler for the various ship services generates losses which are not obvious with energy analysis, but may be seen by an exergy analysis of the pressure reducing valve [3]. Pressure reducing generates losses in the system they are required for those systems which are operating at lower steam pressures. It is cheaper to build heat exchangers which operate at lower pressure due to material cost, compared to one, which runs at a higher steam pressure [6]. The example of such element is steam air heater for the steam generators [7]
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