The Evolution of Exhaust Gas Monitoring in Maritime Propulsion Systems

The global shipping industry, covering both international seas and inland waterways, plays a substantial role in greenhouse gas emissions and air pollution. The primary contributors to this issue are ship propulsion engines, which commonly burn fuels with high sulphur content and lower overall purity. In response to these environmental concerns, the global community has initiated a transformation towards cleaner ship propulsion systems. This transformation includes more stringent emission limits being established and gradually enforced. The International Maritime Organization (IMO), through its "International Convention for the Prevention of Pollution from Ships" (MARPOL Convention), sets the framework for these environmental protection regulations.

However, this shift to cleaner technologies will not happen overnight. The economic challenge for many nations to retrofit entire fleets quickly makes it an uphill battle. Moreover, the technology for low-emission or even zero-emission propulsion systems, while progressing, is still years away from being widely available at scale.

Reducing Emissions in the Interim: Exhaust Gas Cleaning Systems

In the meantime, there is a clear consensus that inaction is not an option. Significant efforts are underway to lower both the pollutant content in maritime fuels and the harmful emissions from ship engines. One of the most effective solutions is the use of exhaust gas cleaning systems, often referred to as scrubbers.

Scrubbers work by dissolving gaseous pollutants in water, which is then either discharged into the sea or handled in other ways. While scrubbers in open-loop systems simply shift the pollution from air to water, improvements are being made towards closed-loop systems. In closed-loop systems, the wastewater is contained and treated on land, reducing the environmental impact on marine ecosystems.

Regardless of the chosen system, environmental regulations set clear requirements for compliance and emissions monitoring. This necessitates reliable exhaust gas analysis systems designed specifically for maritime environments, with approvals from classification societies to ensure compliance.

Advanced Emissions Monitoring with Bühler Technologies’ BA 3 MA Analyser

Bühler Technologies has been at the forefront of emissions monitoring for many years. The company offers a wide range of products to meet the needs of maritime emissions monitoring, from gas sampling points to advanced conditioning and analytical systems. One of their latest innovations is the BA 3 MA gas analyser.

The BA 3 MA analyser is certified by DNV according to test specification CG 03 339 and complies with the stringent requirements of regulation MEPC 259(68). This cutting-edge device provides accurate and real-time monitoring of critical emissions parameters, helping ships stay within environmental limits. It measures sulphur dioxide (SO₂) with a non-dispersive ultraviolet (NDUV) sensor, covering a range of 0-100 ppm, and carbon dioxide (CO₂) with a non-dispersive infrared (NDIR) sensor, covering a range of 0-10 vol.-%. The analyser also calculates and outputs the SO₂/CO₂ ratio in ppm/vol.-%, a crucial metric for emissions compliance.

All relevant data, including status updates, alarm messages, and limit value exceedances, are clearly displayed on an intuitive touch display. Additionally, the system can communicate these details via potential-free relay contacts and Modbus TCP, allowing seamless integration into ship monitoring systems. Measurement values are accessible both in analogue and digital formats, providing flexibility for different operational requirements.

Future-Proof Solutions for Maritime Emissions Compliance

As the maritime industry continues to navigate the complex path towards cleaner propulsion systems, emissions monitoring will remain a critical component of environmental compliance. The future of exhaust gas cleaning may evolve, but with Bühler Technologies’ marine components, ship operators can rest assured that they have a robust, future-proof solution for managing and monitoring their emissions.

Whether open-loop, closed-loop, or other emerging technologies become the dominant method for exhaust gas cleaning, emissions monitoring systems like the BA 3 MA analyser will continue to play a pivotal role in helping the industry meet global environmental standards. In this way, maritime operators can contribute to reducing their ecological footprint while still maintaining their crucial role in global trade.