Abstract: Provided is a catalyst for removing NOx from a combustion exhaust gas, in particular, a low-NOx combustion exhaust gas, wherein the catalyst has a ratio of a pore volume in a range of not less than 500 ? and not more than 3000 ? in a pore diameter relative to a total pore volume of not less than 15% and not more than 40% and preferably a ratio of a pore volume in a range of not less than 1000 ? in the pore diameter relative to the total pore volume of not less than 10% and not more than 45% in a pore volume distribution in a range of not more than 105 ? in the pore diameter, and where SILICA is unlikely to be deposited and even when the amount of SILICA deposited is increased, denitration performance is hardly lowered.

Abstract: Provided are: a cleaning agent for a denitration catalyst; and a denitration catalyst regeneration method and a denitration catalyst regeneration system which make it possible to efficiently remove matter adhering to a surface of a catalyst and to greatly restore catalytic performance. The regeneration method includes: a prewashing step (S12) of washing a denitration catalyst with water; a liquid agent cleaning step (S14) of immersing the denitration catalyst washed with water in a liquid agent containing an inorganic acid and a fluorine compound; a step of recovering the denitration catalyst from the liquid agent; and a finish washing step (S16) of washing the denitration catalyst recovered from the liquid agent with a finish cleaning liquid which is water or sulfamic acid-containing water.

Abstract: Provided is a catalyst for removing NOx from a combustion exhaust gas, in particular, a low-NOx combustion exhaust gas, wherein the catalyst has a ratio of a pore volume in a range of not less than 500 ? and not more than 3000 ? in a pore diameter relative to a total pore volume of not less than 15% and not more than 40% and preferably a ratio of a pore volume in a range of not less than 1000 ? in the pore diameter relative to the total pore volume of not less than 10% and not more than 45% in a pore volume distribution in a range of not more than 105 ? in the pore diameter, and where SILICA is unlikely to be deposited and even when the amount of SILICA deposited is increased, denitration performance is hardly lowered.

Abstract: Provided are: an exhaust gas treatment catalyst capable of improving NO conversion rate when performing denitrification using CO as a reducing agent, and improving CO oxidation rate when oxidizing CO present in the exhaust gas; a method for producing an exhaust gas treatment catalyst; and an exhaust gas treatment system. The exhaust gas treatment catalyst is a catalyst which uses CO as a reducing agent to treat exhaust gas from a sintering furnace, and contains: a support that is a metal oxide or metal sulfate; and an active metal containing at least iridium supported by the support, wherein the specific surface area of the catalyst is 100 m2/g or less, and the crystallite size of iridium in the catalyst is 10-25 nm.

Abstract: Provided are: a cleaning agent for a denitration catalyst; and a denitration catalyst regeneration method and a denitration catalyst regeneration system which make it possible to efficiently remove matter adhering to a surface of a catalyst and to greatly restore catalytic performance. The regeneration method includes: a prewashing step (S12) of washing a denitration catalyst with water; a liquid agent cleaning step (S14) of immersing the denitration catalyst washed with water in a liquid agent containing an inorganic acid and a fluorine compound; a step of recovering the denitration catalyst from the liquid agent; and a finish washing step (S16) of washing the denitration catalyst recovered from the liquid agent with a finish cleaning liquid which is water or sulfamic acid-containing water.

Abstract: A boiler system is provided including: a boiler that burns fuel containing sulfur content, chlorine content, and water content to generate a combustion gas; a bagfilter that removes sulfur oxide; a denitration section that removes nitrogen oxide; a desulfurizing absorbent supply section that mixes a desulfurizing absorbent into the combustion gas on an upstream side of the bagfilter; and a reformer that mixes a denitrating reagent into the combustion gas on an upstream side of the denitration section, wherein the bagfilter performs dry desulfurization, and a temperature of the combustion gas passing through the bagfilter and flowing into the denitration section is higher than 200° C. and 350° C. or lower, and the combustion gas from which the sulfur oxide has been removed by the bagfilter flows into the denitration section without being heated on the upstream side of the denitration section.

Abstract: Provided is a denitration catalyst with an improved wear resistance capable of stably reducing and removing nitrogen oxides in flue gases for a long period of time and a production method therefor. A denitration catalyst obtained by having a honey comb molded body that contains at least titanium oxide and vanadium pentoxide support magnesium surface, and wherein the peak intensity ratio of the first peak of the magnesium sulfate to the first peak of the titanium oxide in X-ray diffraction is 0.05-0.15, the content of the magnesium sulfate increases by 6-22% by mass, the pore volume is 0.17-0.40 cc/g, and the specific surface area is 33-100 m2/g.

Abstract: Provided is an exhaust gas treatment system comprising a catalyst for removing nitrogen oxides by subjecting nitrogen oxides contained in an exhaust gas to catalytic reduction treatment in the presence of ammonia, the catalyst containing titanium oxide, tungsten oxide, vanadium oxide, and at least one oxide selected from chromium oxide and manganese oxide, wherein the catalyst for removing nitrogen oxides is disposed for removing nitrogen oxides and VOC.

Abstract: An exhaust gas treatment catalyst comprises titanium oxide, tungsten oxide, vanadium oxide, and copper oxide and/or Cu/zeolite-coated catalyst, wherein the catalyst is provided with a nitrogen oxide removing capability in which nitrogen oxides contained in an exhaust gas are subjected to catalytic reduction in the presence of ammonia, and with CO and VOC removing capability.

Abstract: A boiler system is provided including: a boiler that burns fuel containing sulfur content, chlorine content, and water content to generate a combustion gas; a bagfilter that removes sulfur oxide; a denitration section that removes nitrogen oxide; a desulfurizing absorbent supply section that mixes a desulfurizing absorbent into the combustion gas on an upstream side of the bagfilter; and a reformer that mixes a denitrating reagent into the combustion gas on an upstream side of the denitration section, wherein the bagfilter performs dry desulfurization, and a temperature of the combustion gas passing through the bagfilter and flowing into the denitration section is higher than 200° C. and 350° C. or lower, and the combustion gas from which the sulfur oxide has been removed by the bagfilter flows into the denitration section without being heated on the upstream side of the denitration section.

Abstract: The present invention provides a flue gas treatment system and a flue gas treatment method that enable the stable long-term operation of a plant by reducing NOx in a combustion flue gas and reducing the concentration of SO3 more compared with that available conventionally. The flue gas treatment method of removing NOx and SO3 in the gas that includes NOx and SO3 includes a denitration and SO3 reduction step of denitrating the gas and reducing SO3 into SO2, in which NH3 as a first additive and a second additive including one or more selected from the group consisting of an olefinic hydrocarbon expressed by a general formula: CnH2, (n is an integer of 2 to 4) and a paraffinic hydrocarbon expressed by a general formula: CmH2m+2 (m is an integer of 2 to 4) are added to the gas before bringing the gas into contact with a catalyst.

Abstract: Provided is a denitration catalyst with an improved wear resistance capable of stably reducing and removing nitrogen oxides in flue gases for a long period of time and a production method therefor. A denitration catalyst obtained by having a honey comb molded body that contains at least titanium oxide and vanadium pentoxide support magnesium surface, and wherein the peak intensity ratio of the first peak of the magnesium sulfate to the first peak of the titanium oxide in X-ray diffraction is 0.05-0.15, the content of the magnesium sulfate increases by 6-22% by mass, the pore volume is 0.17-0.40 cc/g, and the specific surface area is 33-100 m2/g.

Abstract: A DPF regeneration control device includes: a differential pressure sensor which detects a differential pressure between a front and a rear of a DPF; a DPF differential pressure setting unit which sets a DPF differential pressure generated in accordance with a total accumulated amount of soot and ash, sets a DPF differential pressure generated when an ash accumulation amount corresponds to an accumulation amount at which washing is required, as a washing request threshold, and sets a DPF differential pressure generated when the ash accumulation amount is larger than the washing request threshold such that a reduction in output is necessary, as an output reduction threshold; a washing request issuing unit which determines whether or not the DPF differential pressure has reached the washing request threshold; and an output reduction warning unit which determines whether or not the DPF differential pressure has reached the output reduction threshold.

Abstract: In an exhaust gas treatment method for an internal combustion engine, a DPF abnormal combustion causing operation is determined to have occurred when the internal combustion engine shifts from a high rotation or high load operation region ? to a low rotation, low load operation region ? within a set time T1. When it is determined that a DPF abnormal combustion causing operation has occurred, abnormal combustion of PM collected in the DPF is suppressed by fully opening an intake throttle valve (44) in order to increase an exhaust gas flow so that heat is removed by sensible heat of the exhaust gas, thereby cooling a DPF device (52), and continuing a late post-injection in order to reduce an oxygen concentration of the DPF.

Abstract: An exhaust gas purification device for an engine has a filter in an engine exhaust passage, a diesel oxidation catalyst upstream of the filter, and a control unit which effects combustion using the catalyst to perform Active Regeneration of the filter by injecting fuel when no contribution is made to combustion in a combustion chamber when the quantity of particles collected in the filter reaches a predetermined quantity, or is less than the predetermined quantity and an elapsed time from the last filter reconditioning reaches a predetermined time. In the control unit, a mixing quantity of the fuel in oil at Active Regeneration and an evaporation quantity of the fuel from the oil are calculated, whereby a mixing ratio of the fuel in the oil is calculated, and the predetermined time or an engine operation mode is adjusted such that the mixing ratio does not exceed a prescribed control value.

Abstract: A DPF regeneration control device includes: a differential pressure sensor which detects a differential pressure between a front and a rear of a DPF; a DPF differential pressure setting unit which sets a DPF differential pressure generated in accordance with a total accumulated amount of soot and ash, sets a DPF differential pressure generated when an ash accumulation amount corresponds to an accumulation amount at which washing is required, as a washing request threshold, and sets a DPF differential pressure generated when the ash accumulation amount is larger than the washing request threshold such that a reduction in output is necessary, as an output reduction threshold; a washing request issuing unit which determines whether or not the DPF differential pressure has reached the washing request threshold; and an output reduction warning unit which determines whether or not the DPF differential pressure has reached the output reduction threshold.

Abstract: In an exhaust gas treatment device in which a diesel oxidation catalyst and a DPF are provided in an exhaust pipe of an internal combustion engine, abnormal combustion in the DPF, occurring when the internal combustion engine varies from a high load condition to a low load condition, poses a problem. To solve this problem, in the present invention, a DPF abnormal combustion causing operation is determined to have occurred when the internal combustion engine shifts from a high rotation or high load operation region ? to a low rotation, low load operation region ? within a set time T1. When it is determined that a DPF abnormal combustion causing operation has occurred, abnormal combustion of PM collected in the DPF is suppressed by fully opening an intake throttle valve 44 in order to increase an exhaust gas flow so that heat is removed by sensible heat of the exhaust gas, thereby cooling a DPF device 52, and continuing a late post-injection in order to reduce an oxygen concentration of the DPF.

Abstract: An exhaust gas purification device for an engine has a filter which is provided in an exhaust passage of the engine, collects particles in exhaust gas, and is subjected to Active Regeneration for burning and removing the collected particles by heating, and a diesel oxidation catalyst which is provided on the upstream side of the filter and increases the temperature of the filter. The exhaust gas purification device further has a control unit which effects combustion using the diesel oxidation catalyst to perform the Active Regeneration of the filter by injecting fuel at a timing when no contribution is made to combustion in a combustion chamber of the engine when the quantity of the particles collected in the filter reaches a predetermined quantity or more, or when the quantity of the particles collected in the filter is less than the predetermined quantity and an elapsed time from the last reconditioning of the filter reaches a predetermined time.