COMBUSTION GAS COOLING APPARATUS, DENITRATION APPARATUS INCLUDING THE COMBUSTION GAS COOLING APPARATUS, AND COMBUSTION GAS COOLING METHOD

摘要

A fuel gas cooling apparatus includes a cooling duct which causes a cooling gas to flow out into a mixing duct, and a difference of maximum dimensions in a height direction of a flow inlet and a flow outlet with respect to a passage length of the mixing duct is smaller than a difference of maximum dimensions in the height direction of a flow inlet and a flow outlet with respect to a passage length of an expanded duct, or a difference of maximum dimensions in a width direction of the flow inlet and the flow outlet with respect to the passage length of the mixing duct is smaller than a difference of maximum dimensions in the width direction of the flow inlet and the flow outlet with respect to the passage length of the expanded duct.

主权项

1. A combustion gas cooling apparatus, comprising:
a first duct including a first flow inlet into which a combustion gas travels, and a first flow outlet which allows the combustion gas traveling from the first flow inlet to exhaust; a cooling duct which introduces a cooling gas to the first duct at a temperature lower than the combustion gas to flow, and generates a mixed gas in which the combustion gas and the coolant gas are mixed; and a second duct including a second flow inlet which is connected to the first duct and into which flow the mixed gas, and a second flow outlet which allows the mixed gas flowing from the second flow inlet to flow out, wherein a first difference calculated by subtracting maximum dimensions in a first direction of the first flow inlet from maximum dimensions in the first direction of the first flow outlet with respect to a passage length of the first duct is smaller than a second difference calculated by subtracting maximum dimensions in the first direction of the second flow inlet from maximum dimensions in the first direction of the second flow outlet with respect to a passage length of the second duct, and/or a third difference calculated by subtracting maximum dimensions in a second direction, which is substantially orthogonal to the first direction, of the first flow inlet from maximum dimensions in the second direction of the first flow outlet with respect to the passage length of the first duct is smaller than a fourth difference calculated by subtracting maximum dimensions in the second direction of the second flow inlet from maximum dimensions in the second direction of the second flow outlet with respect to the passage length of the second duct, each of the first difference and the third difference being a non-negative value, each of the second difference and the fourth difference being a positive value.