Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Power, Ltd.

Tomotsugu Masuda

Katsumi Nochi

Ko Takayanagi

Kazuki Nishizawa

Yasumichi Aoki

Kazunari Ide

Masashi Kiyosawa

Masanao Yonemura

Toshinobu Yasutake

Masanori Demoto

Akihiro Sawata

Keisuke Okuda

Masatoshi Katsuki

Koji Higashino

Kazuhiro Iwamoto

Makoto Yokoyama

Takafumi Kubota

Tomoaki Isobe

Takahito Miyoshi

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 &#x212b; and not more than 3000 &#x212b; 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 &#x212b; 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 10&#x212b; 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.

Catalyst and method for removing NOX from combustion exhaust gas

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 (S) of washing a denitration catalyst with water; a liquid agent cleaning step (S) 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 (S) of washing the denitration catalyst recovered from the liquid agent with a finish cleaning liquid which is water or sulfamic acid-containing water.

Denitration catalyst regeneration method, denitration catalyst regeneration system, and cleaning agent for denitration catalyst

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&#xb0; C. and 350&#xb0; 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.

Boiler system and power plant including the same

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 m/g.

Denitration catalyst and method for producing same

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.

DPF regeneration control device, DPF regeneration control method, and DPF regeneration support system

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 &#x3b1; to a low rotation, low load operation region &#x3b2; within a set time T. 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 () 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 (), and continuing a late post-injection in order to reduce an oxygen concentration of the DPF.

Aftertreatment system and control strategy for internal combustion engine

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.

Exhaust gas purification device for internal combustion engine

Growing community of inventors

Tokyo, Japan

Tomotsugu Masuda