Abstract: A flue gas mixing apparatus includes gas mixers, wherein the gas mixers have a gas flow channel, one of parallel two faces of a cuboid space being set as a gas flow-in face, the other thereof being set as a gas flow-out face, and in the gas flow channel, each of the gas flow-in face and the gas flow-out face is segmented into at least four regions which have same symmetric areas by straight lines passing through a center of each face, and a gas flow channel partition plate which introduces the combustion flue gas caused to flow in each of the regions of the gas flow-in face into each of the regions of the gas flow-out face at positions at which the regions are shifted one-by-one around a line segment connecting the centers of the gas flow-in face and the gas flow-out face is included.

Abstract: A flue gas mixing apparatus includes gas mixers, wherein the gas mixers have a gas flow channel, one of parallel two faces of a cuboid space being set as a gas flow-in face, the other thereof being set as a gas flow-out face, and in the gas flow channel, each of the gas flow-in face and the gas flow-out face is segmented into at least four regions which have same symmetric areas by straight lines passing through a center of each face, and a gas flow channel partition plate which introduces the combustion flue gas caused to flow in each of the regions of the gas flow-in face into each of the regions of the gas flow-out face at positions at which the regions are shifted one-by-one around a line segment connecting the centers of the gas flow-in face and the gas flow-out face is included.

Abstract: The disclosure relates to suppressing wear of a denitration catalyst due to ash particles having diameters greater than or equal to 100 ?m. A flue gas treatment apparatus includes a denitration apparatus having a denitration catalyst, which reduces nitrogen oxides in flue gas exhausted from the coal combustion boiler, and a duct that guides the flue gas from the coal combustion boiler to the denitration apparatus, and the duct is formed of a horizontal duct connected to a flue gas outlet of the coal combustion boiler, a vertical duct connected to the horizontal duct, and a hopper provided below a portion where the horizontal duct and the vertical duct are connected to each other, wherein a collision plate, which causes ash particles in the flue gas to collide with the collision plate and fall into the hopper, is provided in an upper-end opening section of the hopper.

Abstract: A method and apparatus for treating an exhaust gas comprising heavy metals, wherein the apparatus comprises a heat recovery unit, recovering exhaust gas heat at an exit of the air preheater; a precipitator, collecting soot/dust contained in an exhaust gas at an exit of the heat recovery unit; a wet flue gas desulfurizer, removing sulfur oxides contained in the exhaust gas at the exit of the precipitator; and a reheater, heating the exhaust gas at the exit of the wet flue gas desulfurizer. Each of the heat recovery unit and the reheater has a heat exchanger tube, and a circulation line is disposed to connect the heat exchanger tubes. A sulfur trioxide (SO3) removing agent is supplied to the upstream side of the heat recovery unit, and the temperature of the exhaust gas at the exit of the heat recovery unit is adjusted to not more than a dew point of sulfur trioxide.

Abstract: The following devices are successively disposed in the following order from an upstream side to a downstream side in an exhaust gas duct of a combustion apparatus: an air preheater, preheating combustion air for use in an exhaust gas treating apparatus; a heat recovery unit, recovering exhaust gas heat at an exit of the air preheater; a precipitator, collecting soot/dust contained in an exhaust gas at an exit of the heat recovery unit; a wet flue gas desulfurizer, removing sulfur oxides contained in the exhaust gas at the exit of the precipitator; and a reheater, heating the exhaust gas at the exit of the wet flue gas desulfurizer. Each of the heat recovery unit and the reheater has a heat exchanger tube, and a circulation line is disposed to connect the heat exchanger tubes. A sulfur trioxide (SO3) removing agent is supplied to the upstream side of the heat recovery unit, and the temperature of the exhaust gas at the exit of the heat recovery unit is adjusted to not more than a dew point of sulfur trioxide.