Patent ID: 7059134
Filing Date: 2006-06-13
Classification: F01K,F22B,Y02E

Abstract:
1. A method of providing combustion oxygen to a heat recovery steam generator comprising a part of a cogeneration application, comprising: providing a transition piece with increasing cross sectional area between a gas turbine exhaust outlet of a gas turbine generator and a combustion oxygen input for the heat recovery steam generator; providing a gas seal pneumatically coupled to the transition piece; providing at least one induction fan at an output of the heat recovery steam generator to relieve high back pressure on the gas turbine generator such that combustion oxygen is pulled through the heat recovery steam generator rather than pushed therethrough; when the gas turbine generator is providing gas turbine exhaust, using the gas seal to provide combustion oxygen from the gas turbine exhaust to the heat recovery steam generator to prevent substantial portions of the gas turbine exhaust from exiting through the gas seal; and when the gas turbine generator is not providing the gas turbine exhaust, providing combustion oxygen through the gas seal to the heat recovery steam generator; and generating steam by combustion in the heat recovery steam generator with combustion oxygen from the gas turbine exhaust or from combustion oxygen through the gas seal.