Regenerable NOx Stripping for Gas Turbines

EPA Contract Number: 68D50087
Title: Regenerable NOx Stripping for Gas Turbines
Investigators: Cole, Jerald A.
Small Business: Energy and Environmental Research Corporation (CA)
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: September 1, 1995 through March 1, 1996
Project Amount: $64,782
RFA: Small Business Innovation Research (SBIR) - Phase I (1996) RFA Text |  Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)


Energy and Environmental Research Corporation (EER) proposes to develop a high efficiency NOx control process that recycles NOx in gas turbine exhaust to the flame zone to be destroyed. This process uses a regenerable adsorbent in a simple thermal cycle with no additives or waste materials. Experimental studies show that NOx can be reversibly adsorbed on certain inorganic compounds. NOx is desorbed when the temperature of these compounds is increased. In laboratory tests, one material reduced several hundred ppm of NOx down to less than 2 ppm. It is anticipated that full-scale commercial application of this technology could provide 95% NOx reduction.

Past studies performed by EER have verified the ability of various sorbents to effectively and reversibly adsorb NOx. The NOx adsorption capacity of several sorbents has been studied, and a kinetic model predicting sorbent behavior under various temperature/partial pressure conditions has been developed. Phase I of the proposed project will address additional technical questions needed to determine feasibility for gas turbine applications. Most importantly, this includes evaluating the impact of thermal cycling and high oxygen concentrations on sorbent performance. The adsorption/desorption process requires alternating streams of various temperature gases. Phase I will focus on the impact of the resulting temperature fluctuation and gradients on the sorbent's short term and long tern performance. The experiments will be carried out in a packed bed reactor with on-line instrumental gas analysis and temperature measurements. A calibrated flow panel and valve system will be utilized to provide a series of input streams, closely simulating the proposed full-scale application.

Supplemental Keywords:

Scientific Discipline, Air, Toxics, Sustainable Industry/Business, Chemical Engineering, air toxics, cleaner production/pollution prevention, Environmental Chemistry, Chemistry, VOCs, Engineering, Environmental Engineering, ambient air quality, emission control strategies, Nox, air pollutants, small business, waste minimization, waste reduction, dispersion model, gas turbines, regenerable adsorbent, emission controls, emissions, NOx recycling, circulation model, chemical kinetics, NOx stripping, innovative technology, nitrogen oxides (Nox), pollution prevention, Volatile Organic Compounds (VOCs), air emissions, thermal cycling, atmospheric chemistry

Progress and Final Reports:

  • Final