Sensing Carbon Monoxide and Carbon Dioxide Levels for Gasification Applications

Synthetic gas, also known as syngas, can be burnt and utilized as a fuel source. Carbon Monoxide and Hydrogen are the main constituents of syngas, and amount for around 85% of Syngas.

Syngas is produced by a process called gasification, which begins with a base material that can originate from a range of materials for example pellets, wood chips, fossil fuels (such as  coal), plastics, waste crops sewage, and municipal solid waste.

During gasification, the base material is allowed to react at increased temperature without combustion through regulated amounts of steam or oxygen. The composition of the resultant syngas is affected by the base material’s composition along with the amount of heat and oxygen utilized in the process. The carbon monoxide in the resultant syngas can differ by approximately 20 to 60%. In addition, large amounts of carbon monoxide and hydrogen also form. As a result, it is important to measure carbon monoxide during syngas production.

In 1956, the founder of Edinburgh Instruments, a global provider of advanced analytical Instrumentation, published a paper on the design and development of infrared band pass filters, which are a key component of infrared bench sensors today. Over the past four decades, Edinburgh Sensors has actively commercialized this technology and gained a reputation for supplying precise, low maintenance, and reliable gas-sensing products with long term stability that are utilized worldwide in many process and safety critical applications. These sensing products are now being used to measure syngas from

OEM Gas Sensors

Chillcard NG Gas Sensors

Two new gases – CO2 (carbon dioxide) and CO (carbon monoxide) – have been added to the Chillcard NG range of nondispersive infrared gas sensors (or NDIR gas sensors) developed by Edinburgh Instruments. The new generation of Chillcard sensors include a micro-machined thermal infrared emitter which has an extended lifetime in these adverse environmental conditions. This not only reduces downtime, but also reduces long-term cost of ownership.

Conventional sensors developed for these types of gases utilize a small lamp with a tungsten filament as the main source of infrared light. However, the lamp can have a reduced lifespan in gasification applications where hydrogen levels are extremely high, unlike the thermal infrared emitters used by Edinburgh Sensors.

Gascard NG Infrared Gas Sensors

The Gascard NG sensor is the perfect OEM sensing solution for measuring CO2 or methane (CH4) gas. The sensor can measure 0 to 30% of CO2, or 0 to 30% or 0 to 100% of CO. It features extensive temperature compensation and on-board barometric pressure correction.

The Gascard NG infrared gas sensors offer different interface options, including true RS232 communication, analogue 4-20mA/0-20mA/0-5v, a serial interface for interfacing relay alarms, and an optional on board LAN support. The on-board firmware is designed to support contemporary graphical displays or a standard 4 segment LCD.

Turn-Key Solutions

Besides providing OEM gas sensors, Edinburgh Instruments has been supplying gas monitors, which are built on its proprietary infrared sensor technology, for a number of years. Tens of thousands of these gas monitors are being used across the globe in gasification applications.

A number of volume customers are already evaluating the latest range of Guardian NG gas monitors. These wall-mounted gas monitors can measure 0 to 100% of CO or 0 to 30% of CO2. They include a number of features such as volt free relay alarm outputs regulated by programmable alarm levels; an integral power supply; an IP54 enclosure, and a sample pump, which enables samples to be taken over a distance of 30m.

The Guardian NG Infrared Gas Monitor

The Guardian NG Infrared Gas Monitor

Other features include a graphical user interface (GUI) with password protection and precise pressure and temperature compensated measurement of the gas concentration through a 4-20mA (0-20mA) output or RS232 interface. The GUI displays the compensated gas measurements and controls alarm functions and gas monitor calibration.

OEM Evaluation and Support

Edinburgh Instruments’ engineers provide technical support and one-to-one customer service throughout the process of assessment and system integration.

This information has been sourced, reviewed and adapted from materials provided by Edinburgh Sensors.

For more information on this source, please visit Edinburgh Sensors.

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