Preconcentrator with high volume chiller for high vapor pressure particle detection
| DWPI Title: Apparatus for collecting particles entrained in sample gas stream, has adsorption media that collects particles entrained in sample gas stream at temperature below sample gas stream, and transfers particles to carrier gas stream |
| Abstract: Apparatus and method for collecting particles of both high and low vapor pressure target materials entrained in a large volume sample gas stream. Large volume active cooling provides a cold air supply which is mixed with the sample gas stream to reduce the vapor pressure of the particles. In embodiments, a chiller cools air from ambient conditions to 0-15° C. with the volumetric flow rate of the cold air supply being at least equal to the volumetric flow rate of the sample gas stream. In further embodiments an adsorption media is heated in at least two stages, a first of which is below a threshold temperature at which decomposition products of the high vapor pressure particle are generated. |
| Use: Apparatus for collecting particles entrained in sample gas stream. |
| Advantage: The particles of both high and low vapor pressure target materials entrained in large volume sample gas stream can be collected in efficient manner. The cold air supply can be provided through large volume active cooling, and can be is mixed with the sample gas stream to reduce the vapor pressure of particles effectively. |
| Novelty: The apparatus has a chiller (210) that cools coolant gas stream to temperature below a sample gas stream (205). A third duct (245) conducts carrier gas stream (255) having third volumetric flow rate toward a downstream particle detector (290). An adsorption media (220) in fluid communication with sample and coolant gas streams (215) collects particles entrained in sample gas stream at a temperature below the sample gas stream. The adsorption media in alternate fluid communication with third duct transfers the particles from adsorption media to carrier gas stream. |
| Filed: 4/26/2011 |
| Application Number: US13094615A |
| Tech ID: SD 10135.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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