BVG Series
COMMON FEATURES
- Completely automatic by an electronic control system.
- VSD (Variable Speed Drive) by inverter technology.
- Suitable for ATEX Zone 1&2 or no-classified zones.
- Air cooled standard, water cooled system is also available as option.
- For various optional see by page 6.
Biogas and landfill gas compression and treatment stations designed into an easy handling skid composed of an oil-injected rotary screw gas compressor, directly coupled to an electric motor through a flexible coupling, inverter controlled and complete with the following systems:
- At the suction: gas tight filter with water separator and automatic condensate drainer equipped with safety level switch.
- At the discharge: air-cooled after-cooler with water separator and automatic condensate drainer equipped with safety level switch and a final gas/gas heat exchanger.
The wet gas is aspired through a suction filter acting also as a water separator with automatic condensate discharge system, then the gas passes through a suction control valve.
All components in contact with the gas are made in stainless steel or duly protected, due to the presence of CO2 and other aggressive contaminants into the gas.
During the gas compression process, oil is injected inside the rotary screw chamber to perform three main functions: lubrication, sealing and heat absorption. Working in a closed circuit from a gas/oil receiver, oil is pressurized to flow through an oil cooler, then filtered before being injected again into the screw compression chamber.
The gas goes insteadthrough the minimum pressure/no-return valve into an air-cooled after cooler and finally through a gas/gas exchanger before to leave the package.
When the (IW) suction gas/water heat exchanger & (OW) discharge gas/water heat exchanger options (see by page 6) are required to remove the humidity from the wet-gas before and after the compression, a suitable chiller is needed to produce the right quantity of refrigerated water (3-5°C) to treat the gas (normally the chiller is placed into a safe zone).
Normally a mechanical by-pass valve is used to recirculate the gas in excess into suction to reduce the capacity from the value achieved at minimum speed of the electric motor, down to 0%. Sometimes it’s necessary to install a pneumatic controlled by-pass valve to have a more accurate control (in this case a supply of compressed air is necessary).
When the system stops the gas is depressurized by blowing it back into the digester or bleeding it out in the atmosphere.
