CEM India - Abstract

Abstract Information :

Improving performance of APCE through Online Continuous Emission Monitoring system A case study of Tata Steel Limited, Jamshedpur Shubhanand Mukesh, Head -Environment Management Department, Tata Steel Limited, Jamshedpur Mazar Ali , Head - Head Electrical Maintenance-Sinter Plant, Tata Steel Limited , Jamshedpur Abstract: Continuous emission monitoring (CEM) helps in the assessment of correct and representative particulate matter PM emission from a production unit. In an Iron and Steel Plant PM emission are dependent on few variables such as volumetric flow, emission concentration, status of pollution control equipment, operating conditions of the manufacturing unit and total production. Performance of Air Pollution Control Equipment (APCE) like Electrostatic Precipitator effectiveness is directly linked to process control/ optimization and monitoring of particulate matter (PM) emission from a stack. Various issues of the operating conditions such as problem in the conveying system, machine start / stop, process related issues, maintenance related issues are reflected in stack emission monitoring. As one of the agglomeration unit Sinter Plant was having issues with fluctuation of dust emission, it thought to go for Online Power Off rapping for ESPs. During Online Power OFF Rapping (POR) each field of ESPs stops for 90 sec and rapping happens. This is in addition to existing rapping mechanism prevailing in ESPs. This is done for one of the field 1 and field 2 of ESP’s excluding field 3. It has been observed that during online POR when a field stops for 90 secs, a peak in PM emission happens and goes as high as 90-120-250 from normal 60mg/Nm3 which comes down to 60 in 2 min. POR prevents deposition of thick layers of dust on ESP collecting plates which in turn will prevent high/ frequent spikes causing low KV. All ESP internals are being cleaned during 72 hrs Shut down at the intervals of every 3 months, however this may not be required due to Online Power Off Rapping and this has been triggers all because of ability to monitor online stack emission monitoring. Physical and chemical properties of the collected PM have also impact on the emission load of the unit this will also help in taking decision to upgrade or replace the pollution control equipment. Continuous analysis of data also helps to set or compare with the industry benchmark with respect to PM emission. Keywords: Steel Plant, Electrostatic Precipitator, Online Power Off Rapping Emission