Selective catalytic reactor (SCR) door systems

A door system configured for use with a selective catalytic reactor having a doorway to a chamber, the door system comprising:

• a door panel that selectively moves between a closed position for sealing the doorway of the chamber and an open position for permitting access to an interior of the chamber through the doorway, wherein the door panel has an inner side generally facing the interior of the chamber when the door panel is in the closed position;
• a door panel track connected to the inner side of the door panel that selectively cooperates with an interior track of the chamber to facilitate movement of a cart between the door panel to the interior of the chamber;
• an extension piece selectively engageable with the door panel track when the door panel is in the open position to extend the door panel track beyond a periphery of the door panel on a top side of the door panel opposite from a hinge axis of the door panel to facilitate movement of the cart beyond the periphery of the door panel;
• and
• a bridge piece selectively engageable with the door panel track when the door panel is in the open position to connect the door panel track on a hinge side of the door panel with an interior track of the chamber to facilitate movement of the cart across a threshold between the door panel to the interior of the chamber.