Pp Tek Gas Engine Filter Systems

Introduction

Pp Tek Ltd is a filter system manufacturer and installer; the filters remove organo silica compounds, volatile organic siloxanes and volatile organic compounds (VOCs) from landfill gas or biogas prior to deployment in gas engines.

Installed on Combined Heat and Power (CHP) sites, gas engines consume landfill gas or biogas to generate electricity. The filter systems manufactured by Pp Tek are regenerative; the chemicals captured from the gas stream are separated from the filters and dispatched to waste, incineration or recycled back into the landfill site or bioreactors.

The Challenge

The Kyoto Protocol's fundamental objective is to reduce the global emissions of greenhouse gases (GHGs). The protocol established a legally binding commitment to reduce GHGs by 8% from 1990 levels before 2012. Included on the GHG minimisation schedule are the primary by-products of anaerobic digestion from landfill sites; methane and carbon dioxide. UK landfill sites account for a significant proportion of the methane and carbon dioxide emissions released into the atmosphere; methane is over twenty times more harmful to the environment than carbon dioxide. The European Union and UK government have developed regulations (Landfill Regulations 2002 and Guidance on the management of Landfill gas 2004) aimed at reducing the levels of landfill gases emitted into the atmosphere. Adhering to the regulations requires reducing methane and carbon dioxide emissions as much as possible. Hence, CHP sites either collect and utilise the gas, or flare it off. In addition to methane and carbon dioxide, landfill gases contain other contaminants that over time cause engine failure and increase maintenance requirements. Volatile organic siloxane compounds are significant contaminants in biogas, and are often found in toiletries and detergents. In running gas engines, the volatile organic siloxane compounds burn and form the by-product crystalline silicon dioxide. Crystalline silicon dioxide in engines gradually obstructs the injectors and valves resulting in engine and cylinder damage. Positioned in front of gas engine inlets, Pp Tek's particle filters collect removable solid silica particles and volatile organic siloxane compounds from the gas ahead of engine consumption.

What We Delivered

Manufacturers of gas engines specify a variety of chemical compounds to be monitored in raw landfill gas and biogas, along with the concentration limits for successful running. Volatile organic siloxanes are notoriously difficult to detect and analyse. Lucideon (previously Ceram), a UKAS accredited testing laboratory No. 0013 ISO to 17025 has developed a method for the analysis of the seven main siloxanes in landfill gas and biogas with a reporting limit below the gas engine manufacturer requirements. The method is suitable for monitoring purposes and for the detection of high concentrations. Lucideon is one of only a few contract laboratories with the ability to conduct this analysis. Pp Tek routinely engage Lucideon to analyse landfill gas or biogas samples prior to and post filter installations, in addition to scheduled maintenance measurements.

The Pp Tek filter system can also remove many of the compounds listed in the Environment Agency document LFTGN04; these guidelines detail the monitoring requirements and analysis of landfill gases. Lucideon has the authorisation to test for the presence of these volatile organics in landfill and biogas, and validate their removal as a UKAS accredited testing laboratory. Furthermore, Lucideon has extended the accreditation to include sample collection for analysis from clients' sites.

Value to the Client

Pp Tek is able to confirm the reliability and efficiency of the cleansing filter systems, and demonstrate that the regeneration steps are successful. Lucideon provides Pp Tek with a dependable accredited service, and reproducible data demonstrating the consistency of the filter systems.

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