Abstract: Provided are a downward-inclined-flow passage to which flows flue gas from the flue path connecting a boiler with a stack, a sprayer arranged upstream in the downward-inclined-flow passage to inject absorbing liquid absorptive of sulfur oxides in a direction same as that of flue gas flow, an upward-inclined-flow passage to guide flue gas from the downward-inclined-flow passage to the flue path, a reservoir arranged between lower ends of the flow passages, an auxiliary sprayer arranged in the downward-inclined-flow passage downstream of the sprayer to inject absorbing liquid for uniformization thereof in the downward-inclined-flow passage and a baffle plate arranged in the downward-inclined-flow passage downstream of the auxiliary sprayer and in an upper zone of the flow passage to throttle the flow-passage inner diameter.

Abstract: An exhaust gas purification device downstream of a wet desulfurizer for a combustor has a vessel body for intake of exhaust gas from the wet desulfurizer at a lower portion and discharge of the same at an upper end, an auxiliary desulfurizing portion with an injection nozzles for injection of an alkaline solution at a position above an inlet in the vessel body to purify the exhaust gas, bag filters above the injection nozzles to separate particles in the exhaust gas, backwashing nozzles for injection of compressed gas from above the bag filters for backwashing, a drain-receiving tank for reception of drain from the vessel body and a supply pump for supply of the drain in the drain-receiving tank as alkaline solution to the injection nozzles.

Abstract: Provided are a filler-integrated cooler having a cooler body with cooling space, gas inlet and outlet and communicated with bottom and top of the cooling space, a cooling pipe in the cooling space between the gas inlet and outlet to make cooling fluid from a cooling-fluid inlet go around in the cooling space and discharge the same through a cooling-fluid outlet and a filler vertically partitioning the cooling space into portions with the gas inlet and outlet, a nozzle arranged above in the cooling space, a drain circulator supplying drain in a drain reservoir at inner bottom of the cooling space through a drain outlet to the nozzles, using a pump, and an alkaline-agent addition unit to add an alkaline agent to drain.

Abstract: An exhaust gas processing system having excellent durability and good desulfurization and denitration efficiency is provided to efficiently recover carbon dioxide with high purity and reduced processing costs. The exhaust gas processing system has: a desulfurization unit removing sulfur oxides from the exhaust gas by the limestone-gypsum method; a denitration unit arranged downstream of the desulfurization unit to remove nitrogen oxides from the exhaust gas; a carbon dioxide recovery arranged downstream of the denitration unit to recover carbon dioxide from the exhaust gas; and an oxygen supply unit supplying to the desulfurization unit with a faction of the recovered gas from the carbon dioxide recovery unit as oxygen source. An analyzer is used to monitor the purity and recovery ratio of the carbon dioxide recovered, and the supplied ratio of recovered gas is adjusted, based on the monitored purity and recovery ratio.

Abstract: Provided are drain tank storing predetermined amount of drain from cooler; alkaline aqueous solution supply unit with aqueous solution adjustment tank receiving and storing part of drain in drain tank in predetermined amount, solid alkaline agent supplier supplying solid alkaline agent to produce alkaline aqueous solution, alkaline concentration controller controlling solid alkaline agent supplier to regulate alkaline concentration of alkaline aqueous solution, and pump supplying alkaline aqueous solution to exhaust gas entry side of cooler; and alkaline supply control unit with impurity sensor downstream of succeeding cooler, drain pH sensor obtaining detected pH of drain in drain tank, and supply controller controlling alkaline supply amount supplied to exhaust gas entry side of cooler based on detected impurity value to make detected pH to set value.

Abstract: Provided are a front impurity-removing device with a compressor for compression of the exhaust gas from an oxyfuel combustion device to make impurities in the exhaust gas water-soluble and with a cooler for cooling of the exhaust gas compressed by the compressor to condense moisture in the exhaust gas to discharge drainage with the impurities dissolved, and at least a single rear impurity-removing device with a rear compressor for compression of the exhaust gas to a pressure higher than that of the compressor and a rear cooler to discharge drainage. A water sprayer for humidifying the exhaust gas from the oxyfuel combustion device and a front cooler are provided for producing and discharging drainage with impurities dissolved therein upstream of the compressor in the front impurity-removing device.

Abstract: Provided are a downward-inclined-flow passage to which flows flue gas from the flue path connecting a boiler with a stack, a sprayer arranged upstream in the downward-inclined-flow passage to inject absorbing liquid absorptive of sulfur oxides in a direction same as that of flue gas flow, an upward-inclined-flow passage to guide flue gas from the downward-inclined-flow passage to the flue path, a reservoir arranged between lower ends of the flow passages, an auxiliary sprayer arranged in the downward-inclined-flow passage downstream of the sprayer to inject absorbing liquid for uniformization thereof in the downward-inclined-flow passage and a baffle plate arranged in the downward-inclined-flow passage downstream of the auxiliary sprayer and in an upper zone of the flow passage to throttle the flow-passage inner diameter.

Abstract: Exhaust gas from which impurities have been removed through pressurization and cooling by a compressor-based impurity separation mechanism is further cooled by a refrigerator-type heat exchanger. Drain produced from the cooling by the refrigerator-type heat exchanger is discharged and supplied as an alkalinity control agent to at least upstream of an aftercooler in a first impurity separator.

Abstract: An alkalinity control agent is sprayed upstream of a compressor in a first impurity separator to discharge impurities containing at least sulfur oxides in exhaust gas together with drain from an aftercooler in the first impurity separator.

Abstract: Provided are impurity separators which have compressors for supplying exhaust gas comprising carbon dioxide from oxyfuel combustor to target pressure stepwisely before supply to carbon dioxide liquefier and have aftercoolers for cooling exhaust gas compressed by the compressors stepwisely to target pressure, water condensed by cooling being discharged as drain; alkaline agent supply unit which supplies alkaline agent to upstream side of aftercooler in last impurity separator to discharge drain containing alkaline agent having removed impurities in exhaust gas from aftercooler in last impurity separator; and circulation line for supplying of drain from aftercooler in last impurity separator to upstream side of aftercooler in first impurity separator.

Abstract: Impurities in exhaust gas from oxyfuel combustor are removed using simple equipment to reduce installation cost. Compressor-based impurity removal system for compressing exhaust gas mainly composed of carbon dioxide from combustor before supply to carbon dioxide liquefier for removal of impurities in exhaust gas has impurity separators with compressors for compressing exhaust gas from combustor stepwisely to target pressure for liquefaction of carbon dioxide and with aftercoolers for cooling exhaust gas compressed by compressors, water condensed by cooling being discharged as drain, and alkaline agent supply unit for supplying alkaline agent to at least upstream side of aftercooler in first impurity separator. Impurities in exhaust gas are discharged through drain including alkaline agent.

Abstract: Provided are impurity separators which have compressors for supplying exhaust gas comprising carbon dioxide from oxyfuel combustor to target pressure stepwisely before supply to carbon dioxide liquefier and have aftercoolers for cooling exhaust gas compressed by the compressors stepwisely to target pressure, water condensed by cooling being discharged as drain; alkaline agent supply unit which supplies alkaline agent to upstream side of aftercooler in last impurity separator to discharge drain containing alkaline agent having removed impurities in exhaust gas from aftercooler in last impurity separator; and circulation line for supplying of drain from aftercooler in last impurity separator to upstream side of aftercooler in first impurity separator.

Abstract: Impurities in exhaust gas from oxyfuel combustor are removed using simple equipment to reduce installation cost. Compressor-based impurity removal system for compressing exhaust gas mainly composed of carbon dioxide from combustor before supply to carbon dioxide liquefier for removal of impurities in exhaust gas has impurity separators with compressors for compressing exhaust gas from combustor stepwisely to target pressure for liquefaction of carbon dioxide and with aftercoolers for cooling exhaust gas compressed by compressors, water condensed by cooling being discharged as drain, and alkaline agent supply unit for supplying alkaline agent to at least upstream side of aftercooler in first impurity separator. Impurities in exhaust gas are discharged through drain including alkaline agent.

Abstract: Provided are a front impurity-removing device with a compressor for compression of the exhaust gas from an oxyfuel combustion device to make impurities in the exhaust gas water-soluble and with a cooler for cooling of the exhaust gas compressed by the compressor to condense moisture in the exhaust gas to discharge drainage with the impurities dissolved, and at least a single rear impurity-removing device with a rear compressor for compression of the exhaust gas to a pressure higher than that of the compressor and a rear cooler to discharge drainage.

Abstract: According to the present invention, a mercury removing system (A) includes a reaction gas supplier (20) that supplies reaction gas to treatment target gas; de-nitration equipment (2) that reduces nitrogen oxide in the treatment target gas to be removed and oxidizes low water-soluble mercury in the treatment target gas to obtain water-soluble mercury; and desulfurization equipment (7) that removes sulfur oxide and the low water-soluble mercury in the treatment target gas. The mercury removing system further includes an oxidation gas vaporizer (124) that heats an oxidation gas generating liquid to generate oxidation gas and a gas mixer (13) that mixes the oxidation gas with reducing gas to obtain the reaction gas, outside a flue and on the upstream side of the reaction gas supplier (20).

Abstract: According to the present invention, a mercury removing system (A) includes a reaction gas supplier (20) that supplies reaction gas to treatment target gas; de-nitration equipment (2) that reduces nitrogen oxide in the treatment target gas to be removed and oxidizes low water-soluble mercury in the treatment target gas to obtain water-soluble mercury; and desulfurization equipment (7) that removes sulfur oxide and the low water-soluble mercury in the treatment target gas. The mercury removing system further includes an oxidation gas vaporizer (124) that heats an oxidation gas generating liquid to generate oxidation gas and a gas mixer (13) that mixes the oxidation gas with reducing gas to obtain the reaction gas, outside a flue and on the upstream side of the reaction gas supplier (20).

Abstract: The invention relates to a mercury removing apparatus and a mercury removing method in which a mercury removing ratio is improved with low cost, the mercury removing apparatus removes mercury from exhaust gas generated by coal combustion, an acidic solution spraying nozzle for spraying sulfuric acid into exhaust gas is provided on the down stream side of an absorption tower for removing sulfur oxide from the exhaust gas.

Abstract: The invention relates to a mercury removing apparatus and a mercury removing method in which a mercury removing ratio is improved with low cost, the mercury removing apparatus removes mercury from exhaust gas generated by coal combustion, an acidic solution spraying nozzle for spraying sulfuric acid into exhaust gas is provided on the down stream side of an absorption tower for removing sulfur oxide from the exhaust gas.

Abstract: A spiral nozzle comprises a spray guide which sprays droplets of a liquid. The spray guide is formed in a helix converging towards its own central axis L, and has a liquid impingement face inclined at predetermined angles with respect to the central axis L so that a distribution pattern of the liquid in a plane perpendicular to the central axis L is in the form of a spiral shape.