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Technical details

Cogeneration of heat and power is one of the most obvious ways to improve fuel utilisation in thermal power plants thereby significantly reducing primary energy consumption and carbon-dioxide emissions. 

In CHP plants, a 90%+ fuel energy utilisation can be readily achieved.

Denmark is known for being at the forefront of design and development of heating systems combined with power generation.

Engine-based CHP plants
The most common technology for engine based CHP is lean burn spark-ignition engines which are currently available in sizes from 4 to approximately 9 MWe per generating unit. The heat generating capacity is approximately the same per unit and plants can comprise as many units as applicable.

Heat is extracted from the engine cooling water system at a relatively low temperature corresponding to the return temperature from a heating system.

The supply temperature of the heat is boosted in engine exhaust gas heat exchangers to the required supply level. Plants can be supplied with supplementary cooling or heat storage systems for situations with imbalance between power and heat requirements.
The power generation efficiency remains high and constant irrespective of the heat production.

Renewable energy CHP plants
In connection with biomass-fired plants, CHP generation is also an interesting and often profitable option.
In the ultimate CHP (back pressure) mode, a substantial amount of heat, up too twice the amount of power, can be produced from the steam cycle condenser with only a minor loss of power generation efficiency.
Depending on heat demand and required temperature level, it is also possible to arrange partial CHP configurations, where heat according to demand is derived by low temperature flue gas cooling and use of low pressure extraction steam, without significantly affecting power production. 

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