Gas Evolution Rate and Volumetric Measurement Apparatus

Instrumentation to monitor gas evolution from exothermic reactions

The proven Gas Evolution Rate and Volumetric Measurement Apparatus measures the gas evolution rate and volumes from exothermic decomposition of reaction masses at atmospheric pressure. Primarily used by Hazards and Process Studies Groups, the described test apparatus provides a means for screening unstable reactor contents and indicates whether the decomposing mass is likely to be un-ventable.

The apparatus consists of a glass "U" Tube, partly filled with oil and equipped with a gas venting port, gas inlet port and pressure port. A bottom run off valve is also included for oil removal. A normally closed solenoid valve is connected to the gas venting port and a pressure transducer complete with interface and seals is used to measure oil head pressure within the "U" Tube.

Electronic signal processing is employed to determine the volumetric gas evolved and to provide signals proportional to the gas evolution rate and total volume measured.

When gas enters the "U" Tube via the inlet port, gas pressure displaces the oil medium in one leg of the tube; this causes a change in head pressure as read by the pressure transducer. Pressure changes are monitored by the signal conditioning electronics and when a preset pressure is reached, as set by the user (equivalent to a linear displacement of oil within the tube) the solenoid valve is opened causing the accumulated gas to vent. The solenoid valve remains open for a short interval allowing the oil to equilibrate and then the cycle is repeated.

The number of gas vents to atmosphere is counted and the stored count value is displayed on the front panel of the instrument. Therefore, the number of gas vents multiplied by one collected volume equates to the total volume of gas evolved.

A chart recorder or computer data logging system may be employed to record the Gas Evolved for each cycle of operation.

Signals Provided for Logging and Monitoring:

  1. Liquid Displacement — Analogue output, proportional to gas evolved per cycle.
    (0 to 10 volts, equivalent to 0 to 750 mm linear displacement)
    (Can be used to determine gas evolution rate per cycle)
  2. Repeated Cycles — Analogue output proportional to the number of repeated cycles.
    (0 to 10 volts, equivalent to 0 to 255 cycle counts)
  3. Repeated Cycles — Digital output proportional to the number of repeated cycles.
    (0 to 255 counts. 8 bits, binary)
 
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