When to use PEMS, CEMS, or both ABB
Predictive Emissions Monitoring Systems (PEMS) are emerging as a viable alternative to Continuous Emissions Monitoring Systems (CEMS), but they should not be considered a like for like swap in all applications. Gregorio Ciarlo, Product Manager for Predictive Emission Monitoring Systems for ABB Measurement & Analytics, explains how, when circumstances permit, PEMS can be considered as a complement or even as an alternative to CEMS, and push system availability as high as 99.5 percent.
Plant owners and operators face a wide range of challenges that affect the operations and the productivity of their facilities. Tightening environmental regulations and emission limits especially are putting the onus on companies to put sustainability at the heart of their processes. Meanwhile, the pressure is on to control costs, and take additional steps to address the growing skills shortage.
Accurate emissions monitoring is key to managing and mitigating the impact that a company’s operations have on the environment. Failing to provide emission data to authorities can lead to fi nancial penalties, and even forced plant shutdowns. For this reason, emissions monitoring is an area where it is increasingly important to ensure that the best possible systems are in place to capture and report data.
2 6 PEMS – a brief introduction
Traditionally emissions monitoring is achieved using Continuous Emissions Monitoring equipment (CEMS), whereby a small sample of gas is extracted and measured by a gas analyzer. A wide range of solutions are available to measure different gases, either individually, or using equipment such as ABB’s ACF5000, across multiple gases.
In gas measuring applications, PEMS can also be used either alone or alongside CEMS to improve effi ciency and accuracy. PEMS involves dedicated software which provides a reliable real-time estimation of emission properties by means of a mathematical model (e.g. neural networks), using process values such as temperature, fl ow and pressure as input variables. The software is used to estimate pollutant concentrations, with predictive models exploiting the inherent correlations between process variables, ambient conditions, and emission properties (NOx
system uses AI to provide emission estimations with an accuracy comparable to conventional hardware analyzers. Crucially, PEMS improves system uptime. A typical CEMS can generally be expected to achieve 95 percent availability, while the use of PEMS increases this to 99.5 percent.
, SO2 , CO, CO2 ). From this, the
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52
