The expression means that electrical power and heat are generated simultaneously from the same source of energy, namely burning gas in the gas engine, driving a generator by that and utilizing with high level of efficiency the heat output of the gas engine. Components of the heat energy are the cooling water, lubricant, utilization of the combustion gas and the cooling of the turbo charger. Generally the ratio of electrical power and heat is 40/60 percent depending on the model.
The gas engine is a special Otto-cycle engine the rotational energy of which is transformed to electrical power by a generator. It does not need high pressure gas supply; the normal supply line can provide its operation. The main advantage of it is that the loading can be changed in wide range without significantly reducing the total efficiency. The performance range of gas engine models varies from kW to MW. It's possible to construct modular systems and continually enlarge them. The operation of gas engines can be provided by remote surveillance. It is a reasonable solution for those who need both electrical power and heat energy. It is also useful for those who would like to control and monitor their power generation on their own and comply with environmental regulations. The combined power generation with a gas engine is practically utilized in areas where electrical power, heating and cooling is needed simultaneously, and the equipment operates at least 6500 hours in a year.
The generated electrical power can replace bought electrical power and the excess can be sold to the local electrical utility service provider.
The generated heat (i.e. 90°C or 127°C water) can be used for producing sanitary hot water throughout the year, heating in winter or cover our industrial or agricultural needs for heat. The fuel of gas engines is primarily natural gas, but organic gas or propane can also be used.
Combined power generation based on natural gas as main source of energy is the solution for those who:
The fuel of the gas engine can be:
Advantages of combined heat and power generation:
The comparison of combined power generation and traditional power generation methods shows significant saving in favour of combined power generation.
Scope of application:
The formerly described combined heat and power generation complemented with absorption cooling. It means that the gas engine heating-cooling-power generating unit can be better utilized. Besides electrical power generation which is performed by the gas engine-generator unit the available heat can be utilized for both heating and cooling. Cooling performance is 70% of the heat output. Trigeneration makes possible to continually maintain electrical power generation practically throughout the year for 7800-8200 hours.
Working principle of a trigeneration gas engine system
Advantages of trigeneration:
Scope of application