New super sensitive NDIR CO2 gas analyser for carbon capture and storage

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Source: Signal Group Ltd

The new ‘Pulsar’ class Gas Filter Correlation NDIR gas analyser

The result of extensive new development work part funded by the UK Technology Strategy Board (TSB), Signal launch the new Pulsar class GFC NDIR gas analyser.

The objective of this work was to develop a CO2 gas analyser for the accurate measurement of carbon capture and storage projects. The project was undertaken with cooperation between Signal Group, National Physical Laboratory and BP Group.

Whilst the work was based on the existing NDIR product manufactured by Signal Group, there needed to be a substantial improvement in the accuracy, sensitivity and increase in the dynamic range to meet the demands for process pre capture and post capture measurements. This requirement amounted to a 10-fold improvement over the existing design. Work focused on measured errors coming from the rotating gas filter timings mark, the gas filter chamber stability, electronic errors coming from the existing pre amp circuit design and the solid-state infrared detector.

Further work under the ‘TSB’ funding allowed for software developments, which produced the 10,000:1 range ratio to have linearity to +/- 1% of measurement point. As improvements were made, the prototype was tested at the UK National Physical Laboratory to firmly determine performance. In due course, the prototype was field tested on a carbon capture trial site in the UK.

The ‘Pulsar’ name for the design was chosen because ’Pulsar’ stars in the solar system emit a time based RF pulse which has such an accurate time signature it exceeds that of an atomic clock. It is such a time signature signal in this new design, which provides the 10-fold improvement in performance. Whilst we can offer a CO2 analyser for carbon capture and storage applications at the pre capture stage as well as the post capture stage, which can be used to better effect than other methods.

Further applications for CO2 measurements, needing similar dynamic range with high sensitivity, has come from a trial method of monitoring accurate dilution in CO2 within a system in the measurements of aircraft engine particulates. Applications for such accuracy have found interest in automotive emissions testing. Gases also pertaining to NDIR technology are for example, carbon monoxide in auto exhausts. With motor vehicle carbon monoxide emissions becoming lower than ever, this new development can also be successful in measuring before and after catalysts in exhaust systems. As well as allowing measurements in petrol engine exhaust and diesel engine exhaust within one analyser rather than the normal use of several separate analysers.

The result of this project has been the production of a new class of NDIR analysers which surpasses all previous designs and which provides a solution to the very onerous demand in a carbon capture and storage process. It also allows future adaptations to meet the needs of vehicle and engine exhaust emissions measurements, as well as other possible application.

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