When looking for opportunities of decentralized generation of electricity, a block heat and power plant is definitely the right choice. Its realization is of an even greater advantage if the heat energy contained in the flue gases is used.
An optimum of the applied primary energy (e.g. natural gas) is used when the flue gases leave the system at the deepest temperature possible.
First, the flue gases are cooled in a heat exchanger from approx. 480 °C to 280°C for example, while heating the thermal oil in the counter flow to a temperature of 270°C. The thermal oil circuit is pipe-connected with the customer’s consumer.
The flue gases cooled down to 280°C are directed into a subsequent unit where they are further used for (e.g. thermal oil or water) heating.
Thus, the overall combustion efficiency of up to 95°C can be reached!
Note: Acc. to German norms and regulations, block heat and power plants must ensure optimum energy utilization when in operation. Therefore, they are in operation and generate electricity only if heat is actually required. Otherwise, about 60 % of the primary energy would be wasted.
Taking into consideration that many applications are nowadays heated electrically, which causes considerably higher costs than the direct generation of heat with natural gas, the following advantages are given, when electricity is generated by block heat and power plants:
– Cost-savings through own heat and electricity generation
– Higher independence from the electricity provider
– Extremely high combustion efficiency, based on the applied primary energy