Gas Treatment
Some of the components in the producer gas shall be removed because of their negative side effects on cleanest gas applications, like fuel cells. Here are some examples:
First and foremost the gas remains solid particles which have to be removed from the gas stream. This can be done by ceramic, metal-membrane and silicate wool filter candles.
But there are still components in the gaseous phase which can fall out and lead to clogging of various unit parts. They are called tars when they are already settled and composed of organic matter. To avoid the precipitation of tars it is necessary to have temperatures high enough at every time and place where the gas stream passes.
Another example for the importance of gas treatment is sulphur. It is a well-known catalyst poison which can cause irreversible damage in SOFC (degradation of cell activity) in very short time. There are lots of methods for desulphurisation. Most are based on the principle of adsorption. Hereby some of the components from the gas adhere to a solid phase, called adsorbent.
