Multi-circulation heat recovery steam generator for enhanced oil recovery/steam assisted gravity drainage

A boiler with multi-circulation for a heat recovery steam generator (HRSG) for steam assisted gravity drainage (SAGD) or enhanced oil recovery (EOR), comprising:

• a steam drum internally partitioned to have a clean side and a dirty side;
• a clean downcomer pipe connected to the clean side of the steam drum;
• a clean riser pipe connected to the clean side of the steam drum;
• a dirty downcomer pipe connected to the dirty side of the steam drum;
• a dirty riser pipe connected to the dirty side of the steam drum;
• a furnace having a plurality of individually replaceable membrane wall modules, each module comprising at least one upper header, a membrane roof connected to and sloping downwardly away from the upper header, a membrane wall connected to and descending from the membrane roof, a membrane floor connected to and sloping downwardly from the membrane wall, and at least one lower header connected to the membrane floor, the roof, the wall and the floor together defining a fire box having an inlet end and an outlet end, and the furnace including a membrane front wall connected to the upper and lower headers and being at the inlet end of the fire box;
• an inlet coupled to a hot exhaust gas source for heating the firebox;
• a clean steam generator bank located in a high heat flux zone and coupled to the clean downcomer pipe and the clean riser pipe;
• and
• a dirty steam generator bank located in a low heat flux zone and coupled to the dirty downcomer pipe and the dirty riser pipe.

A heat recovery steam generator (HRSG) boiler with multi-circulation for steam assisted gravity drainage (SAGD) or enhanced oil recovery (EOR), comprising:

• an inlet coupled to an exhaust source;
• a steam drum having an internal partition that provides a clean side and a dirty side, wherein an interconnecting feed pipe extends through the internal partition from the clean side to the dirty side;
• a clean downcomer pipe connected to the clean side of the steam drum;
• a clean riser pipe connected to the clean side of the steam drum;
• a dirty downcomer pipe connected to the dirty side of the steam drum;
• a dirty riser pipe connected to the dirty side of the steam drum;
• a clean steam generator bank located in a high heat flux zone and coupled to the clean downcomer pipe and the clean riser pipe;
• and
• a dirty steam generator bank located in a low heat flux zone and coupled to the dirty downcomer pipe and the dirty riser pipe.