CUPOLA EXHAUST GAS ANALYSIS METHOD

Abstract

The authors analysed the exhaust gas from cupola for rationalization of cupola operation, and also for the purpose of getting a high-strength cast iron of constant composition which are desired. For such kind of gas analysis, hitherto, the chemical method, such as the Orsat or Hemple gas analysis equipment had wholly been adopted. But later the physical method to examine CO₂ quantity by measuring electric conductivity or specific gravity of CO₂ in exhaust gas has mostly been used. This physical method can be carried out automatically but it is subject to lack in exactness by the influence of other kind of gases than. CO₂.
It was found that when the Orsat analysis equipment was used jointly with the CO₂ meter of electric-conductivity type for the calibration of its meter, the absolute value of CO₂ was not obtained unless they paid special attention to CO₂ absorbent and the absorption pipet for Orsat method. Especially in case of continuous measurement, other combustion analysis method must be adopted at the same time.
The authors made determination of not only CO₂, O₂ and CO but H₂ & CH₄ also, by the precise analysis equipment, and also closely analysed each of H₂S and SO₂ by another chemical method, for the purpose of getting the reference data for the performance test of CO₂ meter.
Regarding the above mentioned matters, all are carried out by way of test in the laboratory, but as a result of practical operation of an absoption semi-automatic CO₂ meter manufactured for trial which had been cleared away from any error of meter method and any trouble with Orsat method, it was found that this meter was simple both in construction and operation and with it one could measure speedily. Therefore the authors are using this meter at present.