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NOx (nitrogen oxide) measurement

Nitrogen monoxide (NO) is a gas that is created during all kinds of combustion processes. In the air (in combination with oxygen), the nitrogen monoxide (NO) emitted is converted fairly quickly into nitrogen dioxide (NO2). The sum of nitrogen monoxide (NO) and nitrogen dioxide (NO2) is called nitrogen oxides (NOx). Nitrogen oxide is harmful to the respiratory tract, destroys the ozone layer and is bad for biodiversity. Furthermore, 30-40% of all particulate matter, also dangerous to humans and animals, comes from NOx. That is why requirements have been set for the maximum emission of NOx from combustion plants.

In flue gases from the glass or ceramic industry, approximately 90% of the NOx content is present in the form of NO and 10% as NO2. The levels of NOx, calculated as NO2, are between 500 and 2000 mg / Nm³ in the glass industry. Flue gases from tunnel kilns for the preparation of ceramic products contain considerably lower NOx concentrations.

 

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Solution: NOx measurement

The Model 9110T uses the chemiluminescence detection principle, coupled with the latest microprocessor technology to provide the sensitivity, stability and ease of use for monitoring nitrogen oxide levels. The 9110TH offers a higher range and the 9130T includes a converter sampling system for very accurate measurement of NH3.

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SO2 (sulfur dioxide) measurement

Sulfur dioxide causes local problems after release, such as breathing difficulties, eye irritation, lung problems and even death at relatively low concentrations (> 3 ppm). It is also bad for plant growth. For this reason, the SO2 content must be measured in flue gases released during combustion. Sulfur dioxide can be recorded continuously with the aid of infrared absorption measurements. Sulfur oxides can be present in the form of SO2 and SO3 or bound in dusty alkali metal sulfates.

 

Solutions: S02 measurement

Teledyne's 6000 series microprocessor-controlled ultraviolet photometer is designed for continuous analysis of critical process parameters. Incidentally, it is only one of the solutions to measure SO2 and Inventech has several analytical instruments available to measure SO2 in flue gases. Contact Inventech for the right solution for your application and / or download the brochure here.

Measure HF (hydrogen fluoride) and HCl (hydrogen chloride)

Fluoride can mainly be present as gaseous HF (hydrogen fluoride) in the flue gases. For example, in the glass industry it is used as an etchant. However, in cement production, dusty CaFz is also formed by flue gases. Hydrofluoric acid is also toxic in concentrations of 1 to 7%, but only lethal with acute exposure to 8000 ppm. Hydrogen chloride (HCl) is an inorganic compound of hydrogen and chlorine.

HCI is by far the most important chlorine-containing component in flue gases from glass furnaces. If the flue gas is very low in sulfur, chlorine below 700 ° C can also occur in the form of dusty alkali or alkaline earth chloride. In sulfur-rich flue gases, alkali and alkaline earth components are mainly present in the form of dust-like sulphates. The dusty NaCI or CaCI is relatively harmless. In addition to dusty chlorides, HCI gas is also important in the ceramic industry. The determination of the HCl concentration can be carried out continuously, by passing the flue gases into solutions that completely absorb the hydrogen chloride. The CI content is measured with the aid of chloride ion-selective electrodes. This equipment is also available in a fully automatic version.

 

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Solutions: Measure HF and HCI

The Teledyne LGA-4000Z series uses the latest technology in the field of TDLAS (Tunable Laser Absorption Spectroscopy (TDLAS). With this technique you can measure one component at a time. Download the brochure here.

Measure O2 (oxygen) in flue gases

Oxygen Analyzers are designed to increase combustion efficiency and thus optimize the process, as well as increase safety. The zirconium oxide technique is often used to measure oxygen in flue gases (which have a high temperature). When sample conditioning is also an option, electrochemical technology often offers many more options, such as cooling and filtering gases.

 

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Solutions: Measure O2 in flue gases

The Intrinsically Safe, Trace (3010 TAC) and Percent (3010 PAC) Oxygen Analysers of the 3010C Series are versatile microprocessor based instruments used to detect oxygen from 0-10 ppm to 100% in a variety of gases. Download the brochure of the 3010PAC here

Optimize combustion efficiency and measure emissions in one solution

There are also analysers that measure oxygen (O2) that can achieve energy savings (optimizing the combustion process) and with which the emission of NOx and SO2 can be controlled at the same time. An optimal solution, which is often used by companies that are required by law to measure emissions. They are sensors that work using the Near Infrared technology. They use lasers to determine the concentration or amount of a grout in a gas. Compared to other measuring methods, this has many advantages, such as non-contact measurement and high selectivity. In addition to SO2, NOx and O2, H2S and CO2 can also be measured continuously and simultaneously.

 

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Solution: simultaneous, continuous measurements of CO, CO2, NO / NOX, SO2, CH4 and / or O2

The 7500Z and 7600Z Series Infrared (IR) Analyzers are capable of continuously detecting up to four selected individual IR absorbing components (CO, CO2, CH4, SO2, NO or NOX with external converter). Conveniently packaged in a 19-inch rack mount (model 7500 ZA / 7600ZA) or NEMA4 wall mount housing (model 7500 ZB / 7600ZB), the analyser can also be supplied with an oxygen sensor, which will be both space-saving and cost-effective (7600ZAXL). The NEMA-4 enclosure can be configured to meet installation requirements for Class 1, Div 1 (Zone 1) or Class 1, Div 2 (Zone2). This concerns an extractive measurement plus sample conditioning.

Benefits: up to five simultaneous, continuous measurements of CO, CO2, NO / NOX, SO2, CH4 and O2 Range from 0-10 ppm to 0-100% (gas dependent) Luminous LCS screen with all measurements and settings Low profile 3U design to minimize rack space oxygen measurement with paramagnetic or electrochemical sensor (optional). 

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Flue gas measurements: ceramics, concrete and glass production

Contact us for NOx, SO2, HF, HCl and / or O2 measurement