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Show PEMS: The Software CEM September 22, 1993 TM Callidus Technologies builds low N O x burners, flares and incinerators. They have an exclusive joint venture with Pavilion - Austin to install the Software C E M ™ at refining and petrochemical plants. What is PEMS, the Software CEM™? PEMS, the Software CEM™ accurately predicts NOx, C O and 02 emissions from boilers, heaters, reformers, turbines and other combustion equipment. The P E M S is a computer program installed on your unit's D C S or a separate computer workstation. Emissions vary with the firebox temperature, firing rate, excess level, fuel gas composition and many other subtle operating variables. P E M S finds the relationship between stack emissions and operating conditions for each specific unit. This model predicts future N Ox and C O emissions as accurately as a C E M S can be measure them! PEMS eliminates the need for a hardware CEMS on the stack along the associated maintenance and the downtime. The PEMS software has three parts: • Data File Tools: Easy commands allow you to check the data graphically, then merge files from different sources. • Predictive Model Program: The program automatically correlates emissions with the process inputs. A sensitivity analysis shows which inputs have the greatest effect on emissions and which have none. H o w is a P E M S Installed? Callidus will review your operation with you and develop a project plan to achieve certification. Callidus and your process control engineers will access the D C S database. This is often very simple, but if necessary, Callidus will write a data acquisition program or install a data historian to collect the D C S data. A stack testing van (RATA certified) will collect NOx, C O and 0 2 data for 2-3 days. During that time, the unit will operate low, medium and high firing rates. Callidus will merge the RATA data and the DCS data. To check the data and build a computer model of the unit takes Callidus about 1-2 days. Callidus builds the first model for you and trains your engineers to do subsequent P E M S projects. The P E M S model will accurately predict stack emissions under any operating conditions covered by the data. Callidus will assist your environmental department in presenting the model to the T N R C C for approval and permit. Callidus will load the model into the D C S for realtime emissions reporting. PEMS, the Software CEM™ Benefits Meets or exceeds all requirements of the new regulations. Guaranteed to pass RATA tests. Requires no stack analyzers, instruments, ladders, platforms, sampling system, etc. Rarely requires additional sensor. Lower cost and less maintenance than a CEMS. A Sensor Validation Program alarms if any sensors drift or fail. Mandated by the T N R C C , this ensures that inputs are properly functioning with reasonable accuracy. If a sensor fails, the model also reconstructs an estimated value for the sensor. Up to five sensors can fail before the P E M S model is invalid. No downtime. Emissions can be calculated from historical DCS data. Has been reviewed by EPA Region 6 and a permit granted for an installation at Arkansas Eastman. Several permits are pending before the TNRCC. Pinpoint key reasons why emissions occur. |
