Anish Bekal

Forbes Marshall , India

Biography:

Dr. Anish Bekal after his Bachelors from MIT Manipal, started his career as Reliability Engineer for RF systems in Remote sensing satellites at Indian Space Research Organisation. He completed his PhD from Indian Institute of Technology Madras in 2013 in the area of Stabilization of Mode locked Fiber lasers and then went on to work as a Researcher in GE Technology center in Bangalore. He worked on several technologies such as Raman spectroscopy and Quantum Cascade lasers for sensing trace gas concentration at high temperature and harsh environments in collaboration with Combustion lab at Stanford University. Currently he is working at Forbes Marshal Pvt Ltd where he has been instrumental in establishing a laboratory focused on developing cutting edge Sensing technologies for Emission measurement and industrial process control. He has 12 research papers in reputed journals and Conferences and filed 4 US and 3 Indian patents.

Short description about presentation:

With the tightened emission regulations for thermal power plants Selective catalytic reactors are being installed in Indian power plants to reduce NOx levels along with FGD for reduction of SOx. Selective catalytic reactors used require precise control of NH3 injected into the system so that excess ammonia does not form ammonium bisulphate which would clog the preheater. Typically two NO sensors are required one before the SCR (500 pmm) and one after the SCR outlet (< 100 ppm) to facilitate feedforward control and feed back control of NH3 Injection. NH3 sensor also would be needed at the outlet to measure the NH3 slip which is of the order of 2 - 5 ppm. Typically measurement of these gases at the outlet are done through extractive systems or close-coupled systems. These systems do not give a true representation of the gas concentrations inside the duct due to reduction in temperature during sample extraction and hence resulting in change of chemical composition and hence the concentration and also, typical extraction points are very near to the walls of the SCR which may not give the true representation of composition in the center of the SCR. Best form of measurement for effective control is to use an in-situ analyser which can measure the gas concentration in its native environment. The design of such an analyser requires laser based Gas spectroscopy methods. The recent developments in Quantum Cascade Technology (QCT) has made it possible to build such analyzers. QCT based Spectroscopy system is effective in countering most of the challenges encountered and provide accurate and reliable measurement. In this paper we will be demonstrating the QCT based spectroscopy analyser which is capable of countering interference effects of moisture and other gases, also power variations caused by vibrations, optical mirror degradation, and heavy dust concentrations.