Coke oven door sealing unit, coke oven chamber and coke oven battery

Coke oven door sealing unit for sealing a coke oven door against a sealing surface of a coke oven door frame of a coke oven chamber, the coke oven door sealing unit comprising:

• a coke oven door for fitting into the coke oven door frame of the coke oven chamber;
• a fixture device for holding a sealing piece opposite to the coke oven door frame in a peripheral area of the coke oven door, wherein the sealing piece is configured to be operated in a first operating state or a second operating state;
• and
• a seal protection element for isolating the sealing piece from the coke oven chamber;
• wherein, in the first operating state, the sealing piece is spaced at a first distance from a sealing surface arranged opposite of the sealing piece;
• and wherein, in the second operating state, the sealing piece contacts the sealing surface, such that in the second operating state, the sealing piece and the seal protection element at least partially form a cavity;
• and
• wherein the coke oven door sealing unit further comprises a first insulation element for thermally insulating the sealing piece, wherein the first insulation element is arranged between the fixture device and the seal protection element.