Air Monitoring

Particulate CEMs for Wet and Dry FGD applications

Dec 12 2014

Author: William Averdieck on behalf of PCME Ltd

Free to read

This article has been unlocked and is ready to read.

Download

Introduction
This paper overviews the challenges of monitoring particulate in wet and dry stack conditions found after wet and dry FGD arrestment plant fitted to coal fired power plant. It describes the techniques used for monitoring particulate in these applications and provides results and incites from the operation and calibration of PCME’s wet stack PMCEM in a wet FGD installation. 

The uptake of wet Flue Gas Desupherisation (FGD) technology in the power industry has created a new demand to continuously monitor particulate emissions due to the challenge of low dust concentration measurement and, in applications without reheat, the need for operation in ‘wet stack’ conditions. Wet conditions are more challenging to continuously monitor than ‘dry or non condensing’ stack conditions due to problems of overcoming interference from water droplets. Traditional particle measurements cannot be used in these applications due to interference from condensed Water vapour. There are essentially two core techniques for monitoring particulate emission concentration with high accuracy in wet stacks and both are extractive in nature (ie a sample is drawn continuously from the stack in a representative fashion) and passed through the analyser before return to the stack.

1) Beta Attenuation
2) Extractive light scatter

In the second type, the extracted stack sample is heated to evaporate any residual water droplets. Thus the sample becomes effectively dry so that it may be analysed by a standard dry measurement technique.


Digital Edition

AET 28.3 September 2024

September 2024

Business News - ENVEA announces acquisition of APAQ Group - SICK and Endress+Hauser sign strategic partnership - Efforts to curb gas flaring intensify amid environmental concerns Air Monito...

View all digital editions

Events

Meteorological Technology World Expo 2024

Sep 24 2024 Vienna, Austria

Elmia Water and Wastewater Fair - POSTPONED

Sep 24 2024 Jonkoping, Sweden

LAO WATER 24

Sep 25 2024 Vientiane, Laos

KIOGE 2024

Sep 25 2024 Almaty, Kazakhstan

View all events