Siloxane separation with the GRW gas cleaning unit
The GRW 50, 100 and 200 gas conditioning systems have been designed for the effective removal of organic silicon compounds (siloxanes) and H2S from fermentation gases. Naturally, GRW cleans the gas efficiently and thoroughly, as organic silicon compounds are always present in fermentation gases. These components need to be filtered out, as siloxanes in a CHP inevitably lead to increased wear and tear on motors and ultimately cause their destruction.
The GRW gas cleaning systems from SILOXA are available in three different sizes. The smallest, the GRW 50, has a compact replaceable filter unit with 200 litres of activated carbon. The GRW 100 and GRW 200 each have two activated carbon filters connected in series on the gas side. The GRW 100 has a useful capacity of 2 x 200 litres of activated carbon and the GRW 200 – the giant of the gas cleaning systems – a useful capacity of 2 x 700 litres of activated carbon.
In the GRW 100 and GRW 200 models, the actual gas cleaning takes place in the first activated carbon filter, known as the working filter. The second filter is a safety filter which only takes over separation of contaminants when the working filter’s uptake capacity is exhausted and, for example, a filter breakdown is not detected in time.
The load status is checked by regular gas sample testing between the stages.
For the adsorption process, it is essential that the fermentation gas to be cleaned has low relative gas humidity. The systems therefore feature a tube bundle heat exchanger in which the moisture-saturated gas is heated before it enters the activated carbon filters in order to achieve a relative gas humidity of < 50 percent.
The GRW 50, 100 and 200 gas cleaning systems are delivered mounted
ready for use, complete with pipework and cabling, on a stainless steel
base frame for installation at ground level. All system components that
come into contact with the gas are made of corrosion-resistant stainless
steel.
The integrated activated carbon filters are replaceable (deposit
system). The filters can be changed in just a few easy steps, without
special tools, by the operator’s personnel. There is no direct contact
with activated carbon that contains contaminants. SILOXA has set up a
logistics network covering the whole of Europe for the delivery and
collection of replaceable filters, which guarantees the prompt and
cost-effective supply of suitable replacement filters on request.
Service
Service consists of replacing the filter, followed by
inertisation and function testing. For this we can offer full service
and delivery service.
Full service is performed by our skilled service technicians. It comprises delivery of replacement filters, removal of the saturated adsorber and installation of the fresh adsorber, inertisation and function testing. The saturated adsorber is returned to the SILOXA production facilities and reconditioned. And of course, SILOXA takes care of the proper disposal of the saturated carbon.
The delivery service consists of the delivery of a replacement filter by SILOXA and collection of the saturated filter. The operator is responsible for replacing the filter. Here too, SILOXA takes care of the proper disposal of the saturated carbon.
Our customers have the choice of two different types of activated carbon. For adsorption of hydrogen sulphide (H2S) and siloxanes, we recommend a water vapour activated doped moulded activated carbon. dopetac sulfo 100® is an activated carbon made from charcoal and has the highest uptake capacity on the market. DGF-4 activated carbon is only intended for adsorption of siloxanes. It is produced from coal by water vapour activation. Further information can be found in the Activated Carbon area.
For more information on the three GRW units please download the following information
or click here to email us.