BHEL (Bharat Heavy Electricals Limited) said that, it has signed an agreement with NANO Co Ltd, a South Korean firm, for design and manufacture of emission controlling devices for coal-based power plants.The Technology Collaboration Agreement (TCA) with NANO Co is for design and manufacture of SCR Catalysts for De-NOx application in coal-fired plants. This agreement will help BHEL to improve its services for emission control systems (De-NOx applications).NANO Co is a manufacturer of SCR Catalysts and related raw materials. It supplies Catalysts to several countries like Germany, France, Italy, China and Taiwan.