초록 ▼

Systems capable of supplying either all gaseous fuel, all liquid fuel, or a mixture of the two, at a preselected ratio have been successfully employed in gas turbine engines. The mixing of such fuels has taken place in the combustion chamber and has caused the nozzle design and system controls to co

Systems capable of supplying either all gaseous fuel, all liquid fuel, or a mixture of the two, at a preselected ratio have been successfully employed in gas turbine engines. The mixing of such fuels has taken place in the combustion chamber and has caused the nozzle design and system controls to complicate the structure and increase costs. The subject system for burning gaseous fuels having a range of calorific values has overcome these problems by providing a simple inexpensive system. The system uses a starting step where only high calorific value gaseous fuel is injected through a first fuel supply passage of an injector and operates the engine to a preestablished engine operating parameter. After the preestablished engine operating parameter has been reached a low calorific value gaseous fuel is mixed in a mixing chamber outside the combustion chamber and injected through the first fuel supply passage until a level of heating value of the mixed fuel or a second engine operating parameter has been reached. The mixing continues and a second fuel supply passage of the injector is opened to increase the mass/volume flow of fuel into the engine. The ratio of low calorific value gaseous fuel increases and the high calorific value gaseous fuel decreases as the engine operating parameters are monitored until the engine operates on only the low calorific value gaseous fuel.

대표청구항 ▼

A method of burning gaseous fuels having a range of calorific values in a combustion chamber of a gas turbine engine, comprising the steps of: starting the engine by injecting only a high calorific value gaseous fuel into the combustion chamber through a first fuel supply passage; monitoring an engi

A method of burning gaseous fuels having a range of calorific values in a combustion chamber of a gas turbine engine, comprising the steps of: starting the engine by injecting only a high calorific value gaseous fuel into the combustion chamber through a first fuel supply passage; monitoring an engine operating parameter to determine when a preestablished value of that operating parameter is achieved; mixing a low calorific value gaseous fuel with the high calorific value gaseous fuel in a mixing chamber when the preestablished value of that parameter is achieved, said mixing step including the steps of decreasing the quantity of high calorific value gaseous fuel and increasing the quantity of low calorific value gaseous fuel; controllably throttling the mixture of high and low calorific value gaseous fuel through the first fuel supply passage and a second fuel supply passage; stopping the flow of high calorific value gaseous fuel and thereafter operating the engine on only the low calorific value gaseous fuel.