R70 testing

R70 testing

 

The R70 test provides a quick and accurate measure of the intrinsic reactivity of coal to oxygen and is backed by an extensive database of results from locations around the world that can enable a direct comparison to be made between coals of similar spontaneous combustion propensity. The R70 values obtained are strongly coal rank dependent and are affected by the intrinsic properties of the coal such as mineral matter content (acting as a heat sink) and coal type. A value for the Relative Ignition Temperature (RIT) of each sample (a high temperature index value obtained from the R70 test as it reaches thermal runaway), is also used to confirm the intrinsic spontaneous combustion reactivity of the coal. As such the adiabatic R70 self-heating rate test produces two spontaneous combustion index parameters at the same time for no extra cost.

R70_curve

Figure 1: Typical adiabatic R70 self-heating rate results for high volatile bituminous (Coal A) and sub-bituminous (Coal B) coals.

Downloadable Files:

Spon-Com-Stockpile-Management.pdf

Spontaneous Combustion Services.pdf