E.S.A. Deutschland Presents on Automatic Sorbent Trap Monitoring at ICMGP
by Matthew Konecny on 07/28/2017Category: Industry News,
Last week Jürgen Reinmann of Environnement S.A Deutschland visited the United States with Altech's Regional Manager Tim Kamcyzc, to present about our Automatic Sorbent Trap Monitoring System (AMESA-M) at the 13th International Conference on Mercury as a Global Pollutant. Please see below for a copy of this presentation or click HERE to download a copy.
Automatic Sorbent Trap Monitoring System – New Normative Standards and Application of this Cost Efficient Continuous Emission Monitoring Technology
Large Combustion Plants as e.g. coal and lignite fired power plants and cement kilns are worldwide one of the biggest mercury sources with emissions of more than 1.000 tons per year. As more and more countries sign the Minamata Convention there is an increasing request to reduce the mercury emissions of such plants.
In the US were already published and were getting into force the US-regulations for the Portland Cement Manufacturing Industry and for combustion plants with the request of continuous emission monitoring of the mercury emissions and very low emission limit values ( ELV´s) of approx. 1.5 μg/Nm3.
In the European Union (EU) the revision of the BREF-document (Best Available Technology Reference document) for Large Combustion Plants is almost finished. The final document will be published in 2017. In the conclusions of the final draft is requested for e.g. coal fired power plants (with > 300 MWth) a continuous monitoring of the mercury emissions, with so called Annual Emission Levels (AEL´s) of 1 – 4 μg/Nm3.
Applicable standards, which describes how such low emissions can be monitored accurate in this low concentration range with Sorbent Trap Monitoring Systems (STMS), were already published in the US as Performance Specification 12 B (PS 12B) and will be published in Europe as a CEN/TS most probably in 2017.
In the European Union (EU) the operation and emission control of industrial facilities is regulates in the Directive 2010/75 EU. The specific requirements for the different kind of plants as e.g. Large Combustion Plants, Waste Incinerators etc. are described in so called Best Available Technology (BAT) Reference (BREF) documents. These documents have to be revised frequently to assure the use of BAT.
Actual the revision work of the BREF documents for Large Combustion Plants (LCP) and Waste Incinerators (WI) is in progress. The final draft of the LCP-BREF document was published in June 2016 and the first draft of the WI-BREF document was published in May 2017.
In both drafts the use of STMS is mentioned as a possible method for continuous monitoring of mercury emissions.
Material and Methods
Known volumes of flue gas are continuously extracted from a flue or duct through paired (QA requirement), in-flue, pre-spiked three-section sorbent traps at appropriate nominal flow rates (Fig. 1). The sorbent traps in the sampling system are periodically exchanged with new ones, prepared for analysis as needed, and analyzed by any technique that can meet the analytical performance criteria.
Fig. 1 Schematic of the sampling method.Fig.
The sampling period can be varied from 30 minutes up to 1 month. Each trap consists of 3 sections (Fig 2).
Fig. 2 Three section sorbent trap
Several QA requirments have to be fulfilled to generate a valid emission monitoring value.
One available STMS on the market is the AMESA M system. Several installations were realized and it could be demonstrated by comparison to installed Hg-CEM, that the Hg-CEM had a negative bias in comparison to the STMS (Fig. 3).
Fig. 3 Comparison of the AMESA M system against a Hg-CEM
It could be also demonstrated with the AMESA M system, that STMS´s can be used also under very complex flue gas conditions and low Hg concentrations with the help of a so called trap shield (Fig. 4).
Fig. 4 Monitoring under complex flue gas conditions
Table 1 Long term sampling under complex flue gas conditions
Trap sampling is a good an reliable solution for continuous emission monitoring of Hg-emissions with a high degree of availability. There are used modifications to handle complex flue gas conditions. However, the use of such trap shields leads actually to discussions in the standardization groups as in this case the sorbent trap is not anymore the first element in which the extracted flue gas is entering. There could be adsorption of mercury by the deposits.