Flare installations

According to the Dutch Emission regulations 'NeR' biogas and landfill gas should be flared using either an open or closed flare system. In case the gas is normally used as a fuel for gas engines, boilers or (micro) gas turbines and the flare will only be used during service on the utilizing equipment or during malfunction of this equipment, it is allowed to use an open flare with visible flame. If there is no utilization available or the capacity is not enough for full utilization, the excess of biogas should be burned using a closed flare where the minimum retention time for the flue gasses is 0.3 seconds and the flame temperature must be at least 900ºC. The GtS closed flare installations fully comply to these specifications, and can easily be adjusted to other international standards where minimum flame temperature and retention time are different. The closed flares can be supplied with a stainless steel chimney without insulation or with a carbon steel, coated, chimney with 100mm high-temperature insulation inside. For capacities higher than 900 Nm3/hr, GtS can offer a double burner flare to extend the maximum capacity up to 2000 Nm3/hr with a turndown ratio of 1:20! For higher capacities GtS can offer you custom-made solutions.

GTP-filter

When biogas is produced in a digester, it is always wet and dirty. Before it can be utilized in a gas engine, it has to be cleaned and water has to be removed. Especially for these process conditions, GtS has developed the GTP-filter. Within the filter body, several processes are integrated. Wet and dirty biogas enters the filter on top and flows downwards while it is cooled. Lowest temperature of the gas is +6ºC, leaving only 1.0% water in the gas. At the lowest point, the condensate is drained from the system. Flowing up again, the biogas is reheated using the heat of the incoming gas, thus saving energy. Now the gas enters the SOXSIA® catalyst section, where remaining H2S and siloxanes are removed. Finally the gas leaves the GTP-filter almost on top of the filter at the same temperature as the inlet temperature of the gas, thus limiting the loss of energy to almost zero! By installing the GTP-filter right at the inlet of the Combined Heat and Power (CHP)-container, the gas is always at optimal condition for the gas engine. For optimal piping route to the engine, the outlet flange of the GTP-filter is located at 2000 mm from the ground.

Total contaminant removal system (TCR)

Removing Siloxanes and other contaminants is essential when purifying landfill gas, digester gas and biogas for use as an efficient energy source. Many consumer and industrial products (deodorants, shampoos, shaving creams, sealant etc.) use siloxanes as dispersion agent. By way of industrial and residential discharges, siloxanes are introduced into sewage and landfills. When the gas (methane) is recovered from wastewater and landfills, siloxanes are present in the gas phase. As the gas is used, siloxanes break down into a white abrasive powder, which damages equipment installed down stream like, boilers, combustion engines, turbines, catalysts etc. Moreover, typical landfill gas, digester gas and Biogas also contains significant amounts of moisture, H2S, SO2 ,halogens and other contaminants. Active coal filters are effective in separating most contaminants, however, carbon, regeneration and disposal costs are high. The unique concept of the TCR unit is; chilling the gas (to approx. -25ºC) via alternating evaporator technology. Chilling gas condenses moisture and most other contaminants and in addition, most of the remaining contaminants dissolve in the condensed moisture, which is separated and drained at various chilling and separation points. Optionally a specialty active coal adsorber can remove the remaining traces of contaminants to provide a virtually contaminant-free-energy- rich gas. Major Advantages 1. Chilling the gas to -25ºC will also lower the dew point of the gas to -25ºC. 2. Since the gas is heated after chilling, condensation will no longer appear downstream the system. 3. Downstream piping does not require heat tracing or insulation, providing additional cost benefits. 4. Removing all contaminants including 2-4% mol water will increase the caloric value of the gas by approx 6% resulting in more electricity production per Nm3 of gas. 5. Downstream the TCR-systems low-quality materials like SS304 or carbon steel can be used because condensation does not appear.