Reducing NOx Emissions of A Cargo Handling Equipment (CHE) with Humid Air System

Humid air system (HAS) has been an effective approach in reducing nitrogen oxides (NOx) emissions of diesel engines. However, to the best of our knowledge, there has not been such system developed for natural gas or propane powered engines. Our recent investigations have demonstrated high potential for reducing NOx emissions of compressed natural gas (CNG) engines with humid air intake, without significant increase in particulate matter (PM) emissions. The proposal project goal is the first phase of our investigation to develop and field test a humid air system for reducing NOx emissions of propane powered forklifts. Forklifts are major cargo handling equipment (CHE) at ports and are used in many industrial operations. For the proposed system, the waste heat of the engine will be used to generate steam from distilled water and feed into a mixing box placed at the air intake of the enginer to provide saturated air for maximum reduction in NOx emissions. Reducing NOx in CHE at ports will have significant impacts on local air quality and the proposed project will aim at providing a flexible and adaptive HAS for existing and new gas powered forklifts with the goal of adapting the system to all CHE in future phases. The proposed system could also be adapted to CNG/LNG freight trucks for near zero emission operations.

Principal Investigator: 

Hamid Rahai, Ph.D.

PI Contact Information:
California State University, Long Beach

Project Number: