Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Power, Ltd.

Itsubishi Heavy Industries, Ltd.

Masanori Demoto

Yoshiaki Obayashi

Masashi Kiyosawa

Masanao Yonemura

Katsumi Nochi

Kozo Iida

Shigeru Nojima

Toshio Koyanagi

Kazuhiro Iwamoto

Toshinobu Yasutake

Akira Hattori

Tomotsugu Masuda

Yoshiharu Watanabe

Makoto Yokoyama

Kyohei Takakura

Provided are a denitration catalyst regeneration method and a denitration catalyst regeneration system, which are capable of recovering denitration performance to a high level and reducing the SOoxidation rate of a catalyst. A denitration catalyst regeneration method according to the present invention includes: a chemical solution cleaning step for immersing a denitration catalyst in a chemical solution containing a fluorine compound and an inorganic acid; a step for extracting the denitration catalyst from the chemical solution; and a finish washing step for washing the denitration catalyst extracted from the chemical solution with a finish cleaning solution containing an organic acid.

Denitration catalyst regeneration method and denitration catalyst regeneration system

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

Provided are an exhaust gas treatment catalyst for denitrifying an exhaust gas including sulfur oxides and vanadium discharged from a heavy oil combustion boiler, including: a support comprising any one or all of titanium oxide and silica wherein a content of silica is from 10% to 20%, and an active component supported in the support and comprising one selected from the group consisting of vanadium and tungsten.

Exhaust gas treatment catalyst

Provided is an exhaust gas treatment catalyst including: a de-NOx catalyst; and a coating layer being provided on a surface of the de-NOx catalyst and containing at least one selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates. In a method for regenerating an exhaust gas treatment catalyst of the present invention, the coating layer of the de-NOx catalyst on which VOSOis deposited is removed with an acid, and after the removal of the coating layer, a coating layer containing at least one selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates is again provided.

Method for regenerating exhaust gas treatment catalyst

Exhaust gas treatment catalyst and method for regenerating the same

The present invention is to provide a catalyst for removing nitrogen oxides which is capable of keeping sufficient denitrification performance, i.e., a high removal rate of nitrogen oxides in exhaust gas having a high NOcontent especially under conditions where the ratio of NO/NO in exhaust gas is 1 or higher, a catalyst molded product therefor, and an exhaust gas treating method. The catalyst is designed for removing nitrogen oxides, which is used to denitrify exhaust gas containing nitrogen oxides having a high NOcontent, which comprises: at least one kind of oxide selected from the group consisting of copper oxides, chromium oxides, and iron oxides as a component for reducing NOto NO; and which further comprises: at least one kind of titanium oxide; at least one kind of tungsten oxide; and at least one kind of vanadium oxide as components for reducing NO to N.

Catalyst for removing nitrogen oxides

A regenerated exhaust gas treatment catalyst () can be produced by coarsely grinding a used exhaust gas treatment catalyst (); separating a coarsely ground material into coarse pieces () and a fine powder (); finely grinding the coarse pieces (); kneading the fine powder together with other raw materials, molding a kneaded material, and drying and burning a molded material to produce a base material (); grinding a fresh exhaust gas treatment catalyst (); forming a slurry solution of the ground product of the fresh exhaust gas treatment catalyst (); coating the surface of the base material () with the slurry solution (); and drying the base material () that has been coated with the slurry solution () and burning the base material () at a temperature higher than the burning temperature employed in the production of the exhaust gas treatment catalyst ().

Method for regeneration of exhaust gas treatment catalyst, and exhaust gas treatment cataylst produced using the method

A catalyst for nitrogen oxide removal, which catalytically reduces nitrogen oxides in an exhaust gas in the presence of ammonia, comprises: a first component comprising an oxide of titanium, an oxide of tungsten, and an oxide of vanadium; and a second component comprising an oxide of manganese, or an oxide of manganese and an oxide of copper.

Catalyst for nitrogen oxide removal and exhaust gas treatment method

A denitrification catalyst regeneration method comprises heat-treating a used denitrification catalyst, then cleaning the denitrification catalyst with an aqueous solution of oxalic acid, and then finish washing the denitrification catalyst with water to regenerate the denitrification catalyst.

Denitrification catalyst regeneration method

The present invention is to provide a catalyst for removing nitrogen oxides which is capable of keeping sufficient denitrification performance, i.e., a high removal rate of nitrogen oxides in exhaust gas having a high NOcontent especially under conditions where the ratio of NO/NO in exhaust gas is 1 or higher, a catalyst molded product therefor, and an exhaust gas treating method. The catalyst is designed for removing nitrogen oxides, which is used to denitrify exhaust gas containing nitrogen oxides having a high NOcontent, which comprises: at least one kind of oxide selected from the group consisting of copper oxides, chromium oxides, and iron oxides as a component for reducing NOto No; and which further comprises: at least one kind of titanium oxide; at least one kind of tungsten oxide; and at least one kind of vanadium oxide as components for reducing NO to N.

Growing community of inventors

Tokyo, Japan

Masanori Demoto