Derek Stuart

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Derek Stuart

Global Product Manager - Power, Combustion and Environmental

Derek Stuart has more than 25 years' experience in industrial gas measurements. As a product development specialist, he was responsible for the design of several continuous emissions monitors, including the successful 4500 opacity monitor which is used to monitor particulate matter emissions in stack gases worldwide. He is a Chartered Physicist, a member of ASTM with contributions to several ASTM standards, and holds two patents in the field of opacity monitoring.

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Do I Need a NOx Converter On My Flue Gas Monitor?

Monday, April 25, 2022 | Derek Stuart

Application

Most combustion sources must monitor their emissions of NOx (oxides of nitrogen) and report them to the local environmental protection authority.

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What Are NOx and SOx and Why Are They Important?

Friday, February 18, 2022 | Derek Stuart

Industry

The terms "NOx" and "SOx" are often seen in emissions measurement specifications, but many people are unsure of their accurate definitions. The terms come from the study of atmospheric chemistry, and each refers to a family of compounds.
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How to Spot Damage in Modern Lime Kilns Using Thermal Surveys

Friday, February 11, 2022 | Derek Stuart

Application

The mineral lime is important in many areas of the economy, including construction, civil engineering, water treatment and steel production. It is produced by heating limestone to a temperature above 900 °C .
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Measuring Gas Temperatures in a Boiler with the CDA Pyrometer

Friday, January 28, 2022 | Derek Stuart

Application

Accurate temperature measurements within industrial boilers are important for safe, efficient, and reliable operation. However, direct measurements using thermocouples are difficult because the elevated temperatures, corrosive gases and high concentrations of particulate matter mean that probe lifetimes are very short.
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Five Uses for Portable Flue Gas Analysers

Monday, November 1, 2021 | Derek Stuart

Products

Fixed flue gas analysers measure emissions of gaseous pollutants from large combustion sources such as power plants and industrial boilers. They continuously provide data 24 hours per day for extended periods, but they are bulky and expensive.
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Measuring Boiler Tube Temperature

Thursday, September 30, 2021 | Derek Stuart

Industry

Boilers are used in many industrial applications ranging from power generation to municipal waste incineration as well as district heating.
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Viewing Fuel Flow in a Stoker-fired Boiler

Wednesday, August 4, 2021 | Derek Stuart

Industry

Stoker-fired boilers are used in many applications with thermal capacities below 50 MW. In these boilers, the fuel is fed by a stoker onto the grate, where it is ignited by heat from the refractory above. As the fuel travels down the grate, it continues to burn, with primary air coming from below.
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Viewing Fuel Flow in a Fluidized Bed

Thursday, July 15, 2021 | Derek Stuart

Industry

Fluidized bed boilers are used in many applications where fuels are difficult to burn. In these boilers, fuel particles are suspended in a hot, bubbling fluidity bed of ash and other particulate materials (sand, limestone etc.) through which jets of air are blown to provide the oxygen required for combustion or gasification.
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Can I Mount my Opacity Monitor on a Positive-Pressure Duct?

Wednesday, April 7, 2021 | Derek Stuart

Products

Opacity monitors are used to measure emissions of smoke and dust from combustion sources. They are mounted directly onto the stack or duct, so a constant flow of purge air is needed to protect their delicate optics from the hot, dusty, and corrosive stack gases.
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How Much Purge Air Does My Opacity Monitor Need?

Thursday, February 11, 2021 | Derek Stuart

Products

Opacity monitors are used to measure emissions of smoke and dust from combustion sources. It is a non-contact measurement, with only a light beam penetrating into the combustion gases in the stack or duct, so the delicate optical and electronic components can be mounted in the ambient conditions.
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