Bruno Mota Posted July 4, 2019 Report Share Posted July 4, 2019 Dear, I'm evaluating mine emergency signage modes. A ideia is to use mercaptano to emergency signace. How can I simulation this? Best Regards Quote Link to comment Share on other sites More sharing options...
Martin Griffith Posted July 5, 2019 Report Share Posted July 5, 2019 Hi Bruno, To simulate the use of a mercaptan gas, or a stench gas, in Ventsim, there are a few options. The easiest way is to use the Contaminant Simulation. Starting on the Contaminant tab of the Edit Box, add a contaminant concentration to an airway from where you will release the stench gas. Then run a Contaminant Simulation. Ventsim will switch the airway colors to "Contaminants | Spead Mix" which will show all of the areas of the mine where the released contaminant will reach and the concentration. However, this simulation assumes an infinite amount of time. It may take a very long time for the stench gas to reach parts of the mine, which could be important to your emergency plan. To see how much time it takes for the gas to reach each airway, switch the color and text data to "Contaminants | Spread Time". Another factor to consider is the release rate and duration of your stench gas, because of the emptying of the stench gas cylinder. To analyse this effect, you need to run a Dynamic Contaminant Simulation. This will simulate the variation with time of the stench gas movement in the mine (remember, before running a dynamic simulation, place Dynamic Monitors in airways of interest). On the Contaminant Tab of the Edit Box you can experiment with the stench gas release. With Fixed Rate, you can stop the gas release after a set amount of time. With Linear and Logarithmic Decay, you can stop the release after a set amount of time, but also have the release rate decay over time. A stench gas release set to end after a set amount of time with a logarithmic decay can model a gas cylinder releasing gas, with the cylinder pressure dropping, and therefore the release rate falling too. In this way you can examine how long it takes for the stench gas to reach a particular airway and if it will arrive with sufficient concentration to be detected. Hope this helps, please let us know if you have any other questions. Quote Link to comment Share on other sites More sharing options...
Bruno Mota Posted July 11, 2019 Author Report Share Posted July 11, 2019 Thank you Martin Griffith, the information was of great value to my simulation. Quote Link to comment Share on other sites More sharing options...
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