The hygroscopic condenser applied to gas engine-based cogeneration plants typically consists of a packaged solution with three packed bed columns. The system is shown in flow diagram form below. Following the flue gas from the engine, it passes through a regeneration - a condenser - and a hygroscopic condenser stage.
There is only limited interaction between the existing cogeneration plant and this tail-end solution, which makes it easy to adopt the technology to any engine plant.
A number of advantages result:
- The gas can be dried to a dew point of 25°C
- The overall energy efficiency of the CHP plant is increased from typically 80-85% to 95-98%
- The gas exits the stack superheated and the plume is reduced or eliminated
- Performance can be modified by using different proprietary absorbents
- Absorbent is not consumed in the process