Natural circulation multi-circulation package boiler with superheat for steam assisted gravity drainage (SAGD) process including superheat

A boiler comprising:

• an upper steam drum that includes an internal divider which divides the upper steam drum into a clean section and a concentrated section;
• a lower drum;
• downcomers connecting the upper steam drum to the lower drum;
• steam-water tubes connecting the lower drum with one of:
• (i) an intermediate drum connected with the upper steam drum by risers;
• or
• (ii) the upper steam drum wherein the boiler does not include an intermediate drum connected with the upper steam drum by risers;
• a superheater having an input terminal connected to receive steam from the clean section of the upper steam drum and an output terminal connected to a delivery steam pipe that delivers superheated steam flow output from the superheater to an injection well of a Steam Assisted Gravity Drainage (SAGD) process or to a turbine;
• and
• a temperature control device comprising an attemperator connected with the output terminal of the superheater and an actuated valve, the attemperator further connected with the concentrated steam section of the upper steam drum to inject concentrated steam from the concentrated steam section of the upper steam drum into the superheated steam flow output from the output terminal of the superheater, and the actuated valve controlling a flow rate of the concentrated steam from the concentrated steam section of the upper steam drum into the superheated steam flow to provide temperature control.

A boiler comprising:

• an upper steam drum having an internal divider which divides the upper steam drum into a clean section and a concentrated section;
• a clean lower drum;
• a concentrated lower drum;
• clean downcomers connecting the clean section of the upper steam drum to the clean lower drum;
• concentrated downcomers connecting the concentrated section of the upper steam drum to the concentrated lower drum;
• steam-water tubes connected to convey a steam-water mixture from the clean lower drum to the clean section of the upper steam drum and to convey a steam-water mixture from the concentrated lower drum to the clean section of the upper steam drum;
• and
• a superheater having an input terminal connected to receive steam from the clean section of the upper steam drum, the superheater being interspersed among the steam-water tubes.