ボイラ圧力の動特性における給水と吸熱の機能

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タイトル別名
  • The Pressure-Generating Effect of Heat Absorption and Feedwater Flow in Boilers
  • ボイラ アツリョク ノ ドウトクセイ ニ オケル キュウスイ ト キュウネツ ノ キノウ

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抄録

It is ordinarily assumed that the superheater and the reheater in boilers, unlike the evaporating section, do not generate pressure by absorbing heat. In this paper it is proved that the boiler pressure increases or decreases by manipulations that tend to increase or decrease the total volume of contained water in evaporators as well as in superheaters and reheaters. A simple theoretical reasoning leads us to conclude that the transfer function from the heat absorption to the steam pressure is mainly affected by the fluid-volume increase in the section devided by the outgoing (and not by the in-coming) fluid volume. Thus the pressure-generating effect in the superheater and the reheater in modern high-pressure boilers is nearly as large as, and sometimes even greater than, the effect in the evaporator. Similar investigation on the feedwater indicates that the steam pressure in supercritical boilers can better be controlled by manipulating the combustion than by manipulating the feedwater flow.

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