Method and apparatus maintaining multi-component sample gas constituents in vapor phase during sample extraction and cooling
An apparatus and method for diluting and cooling that is extracted from high temperature and/or high pressure industrial processes. Through a feedback process, a specialized, CFD-modeled dilution cooler is employed along with real-time estimations of the point at which condensation will occur within the dilution cooler to define a level of dilution and diluted gas temperature that results in a gas that can be conveyed to standard gas analyzers that contains no condensed hydrocarbon compounds or condensed moisture.
1. An apparatus for diluting a heated gas sample comprising at least one condensable component, the apparatus comprising:
at least one thermally insulated wall enclosing a dilution cooler chamber having a sample gas inlet end having a sample gas inlet opening and an opposed dilute sample gas outlet end having a dilute sample gas outlet opening;
a porous conduit disposed within said dilution cooler chamber providing fluid communication between said sample gas inlet opening and said dilute sample gas outlet opening and forming an annular region between said porous conduit and said at least one thermally insulated wall;
dilute gas means for introducing an inert gas into said annular region;
temperature means for measuring a temperature within said annular region;
a thermally insulated coaxial nozzle disposed within said sample gas inlet opening; and
feedback control means for controlling a dilution ratio within said porous conduit based upon a concentration of condensable components in a sample gas.
2. An apparatus in accordance with claim 1 , wherein said feedback control means comprises a performance database determined from CFD modeling of said dilution cooler chamber.
3. An apparatus in accordance with claim 1 , wherein said feedback control means comprises a means for measuring a concentration of diluted components exiting said dilution cooler chamber.
4. An apparatus in accordance with claim 1 , wherein said porous conduit is a porous stainless steel tube.
5. An apparatus in accordance with claim 1 , wherein said at least one wall is coated with a chemically and catalytically inert material.
6. An apparatus in accordance with claim 1 , wherein said coaxial nozzle is coated with a chemically and catalytically inert material.
7. An apparatus in accordance with claim 1 , wherein said dilute gas means comprises an annular region porous tube disposed within said annular region.