CEM India 2019

CEM India - Abstract

Abstract Title: Testing equivalency of alternative methods for monitoring of so2 emissions
Abstract Type: Oral
Session Choice: Calibration and Quality Control
Presenter Name: Ms Tuula Pellikka
Co-authors:Ms Tuula Kajolinna
Company/Organisation: VTT Technical Research Centre of Finland
Country: Finland

Abstract Information :

Euramet launched year 2016 Sulf-Norm project "Metrology for sampling and conditioning SO2 emissions from stacks". The overall aim of this project is to compare conditioned sampling approaches to the unconditioned sampling approach associated with the existing standard reference method, SRM (EN 14791).

Standard Reference Method, EN 14791, that is used at the moment in Europe for the measurement of SO2 is based on wet-chemical measurement method. A sample of gas is extracted via a heated temperature-controlled probe. The sample is filtered and drawn through hydrogen peroxide absorber solutions for a specified time and at a controlled flow rate. The SO2 in the sampled gas is absorbed and oxidised to sulphate ion which is determined either using ion chromatography or by titration with a barium perchlorate solution using Thorin as indicator.

As part of the Sulf-Norm-project, VTT Technical Research Centre of Finland organized in the spring 2017 tests for equivalency of alternative methods for monitoring of SO2 emissions. The aim of these experiments was to test whether alternative methods (AM) could be used to determine SO2 concentrations instead of existing SRM. The advantage of using automated, instrumental method is that they give real time information about the process concentrations where as wetchemical method gives only average value of the sampling time. Instrumental methods that were used in this test were Fourier Transform Infrared Technique analysers (FTIR), ultraviolet (UV)- fluorescence analysers and non-dispersive infrared (NDIR) analysers.

Tests were carried out at the test bench of VTT. Exhaust gas was produced with engine combusting gasoline. SO2-concentrations were varied by spiking of SO2 gas to the exhaust gas flow and the concentration range varied from 2 ppm to 200 ppm. All together 25 samples were taken. The results will be analysed using the principles given in the document TS 14793.

In this presentation, the results and the conclusions from these tests are presented.