Dual Chemistry Steam Drum

Abstract

A partitioned drum for a heat recovery steam generator comprising a first chamber and a second chamber. The first chamber has a chemical inlet for chemically treating a flow medium, at least one inlet for the flow medium and at least one outlet for the flow medium. The second chamber has one inlet for the flow medium and at least one outlet for the flow medium. The flow medium present in the first chamber is treated with a chemical to prevent flow assisted corrosion, while the flow medium present in the second chamber is available as a source of fluid for the boiler feed pump.

1 . A partitioned steam drum for a heat recovery steam generator comprising:
 a first chamber in fluid communication with a chemical source for treating a flow medium, the first chamber having at least one outlet for the flow medium;   a second chamber in fluid communication with a flow medium source and in fluid communication with the first chamber,   wherein the flow medium is conveyed from the flow medium source through the second chamber to the first chamber.   
     
     
         2 . The partitioned drum of  claim 1 , wherein a non-volatile chemical from the chemical source is added to the flow medium in the first chamber. 
     
     
         3 . The partitioned drum of  claim 2 , wherein the non-volatile chemical comprises phosphates. 
     
     
         4 . The partitioned drum of  claim 1 , wherein an inlet of the second chamber is connected to an economizer of the heat recovery steam generator. 
     
     
         5 . The partitioned drum of  claim 1 , wherein at least one outlet of the second chamber is connected to a boiler feed pump of the heat recovery steam generator. 
     
     
         6 . The partitioned drum of  claim 1 , wherein the first chamber is defined by a first body and the second chamber is defined by a second body. 
     
     
         7 . The partitioned drum of  claim 6 , wherein the second body is disposed within the first chamber. 
     
     
         8 . The partitioned drum of  claim 6 , wherein the first body is disposed within the second chamber. 
     
     
         9 . A heat recovery steam generator comprising:
 a low pressure section comprising a low pressure evaporator, a low pressure drum, and a low pressure superheater; and   a high pressure section comprising a high pressure economizer, a high pressure evaporator, a high pressure drum, and a high pressure superheater,   wherein the low pressure drum is a partitioned drum having a first chamber and a second chamber.   
     
     
         10 . The heat recovery steam generator of  claim 9 , wherein the low pressure drum has a chemical inlet that conveys a chemical to one of the first chamber and the second chamber. 
     
     
         11 . The heat recovery steam generator of  claim 9 , wherein the low pressure drum comprises a first body having an inner surface defining the first chamber; a second body disposed within the first chamber, the second body defining the second chamber. 
     
     
         12 . The heat recovery steam generator of  claim 9 , further comprising:
 at least one intermediate pressure section, the at least one intermediate pressure section comprising an intermediate pressure economize, an intermediate pressure evaporator, an intermediate pressure drum, and an intermediate pressure superheater.   
     
     
         13 . A partitioned drum for a heat recovery steam generator comprising:
 a first body having an inner surface defining a first chamber; the first body having a flow medium outlet and a chemical inlet for chemically treating the flow medium within the first chamber;   a second body disposed within the first chamber, the second body defining a second chamber; the second body having a flow medium inlet, a first outlet connected to a boiler pressure pump of the heat recovery steam generator, and a second outlet connected to the first chamber for transferring a flow medium from the second chamber to the first chamber.   
     
     
         14 . The partitioned drum of  claim 13 , wherein a non-volatile chemical from the chemical source is added to the flow medium in the first chamber. 
     
     
         15 . The partitioned drum of  claim 14 , wherein the non-volatile chemical comprises phosphates. 
     
     
         16 . The partitioned drum of  claim 13 , wherein the flow medium inlet of the second body is connected to an economizer of the heat recovery steam generator.