Patent ID: 6092490
Filing Date: 2000-07-25
Classification: F22B

Abstract:
In a heat recovery steam generator wherein heat is recovered from a hot gas flowing in heat exchange contact with steam generating circuits, said steam generating circuits comprising:a. a low pressure steam generating circuit comprising a low pressure economizer section having an outlet connected to a steam separating drum for separating low pressure steam from liquid water and having a separated water outlet, a low pressure evaporator section having an inlet connected to said steam drum water outlet and an outlet connected back into said steam drum and said steam drum further including a separated low pressure steam outlet; andb. a high pressure steam generating circuit comprising a high pressure economizer section with a plurality of parallel tubes each having an outlet, a high pressure evaporator section with a plurality of parallel tubes each having an inlet and an outlet, means connecting each of said plurality of parallel tubes of said economizer section with one of said plurality of parallel tubes of said evaporator section including flow stabilizing orifices in each connecting means, a pressure equalizing header connected to the outlets of said plurality of parallel tubes of said evaporator section and a high pressure superheater section with a plurality of parallel tubes connected to said pressure equalizing header and having high pressure steam outlets.