An Advanced Smoke-Eater and Ammonia Filter for Post-Fire Cabin Atmosphere Cleanup
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TDA Research, Inc. (TDA) is developing a post-fire air purification system that consists of a particulate removal assembly, a sorbent bed to remove the combustion by-products generated by low intensity fires (such as acid gases, NO/NO2, HCN, HCl, SO2 and NH3) and an ambient temperature oxidation catalyst to eliminate any carbon monoxide (CO) and volatile organic compounds (VOCs). The unit is designed to rapidly restore the spacecraft cabin air to a safe condition. TDA’s smoke eater system is a lightweight, compact, gas purification system for an advanced spacecraft. Reducing the weight and volume of the sub-components of the spacecraft atmosphere restoration system is of critical importance to NASA particularly for next generation planetary exploration missions. The paper will include the test bench-scale test results for individual components, as well as integrated testing in a high fidelity prototype in an environmental chamber. The paper will also include a summary of a version of the chemical filter that provides protection against an ammonia leak. This chemical filter and the supporting fan will have the ability to deal with an ammonia challenge of 30,000 ppmv, revitalizing the atmosphere in less than 10 minutes.