Mitsubishi Jukogyo Kabushiki Kaisha

Shigeyuki Nishijima

Atsushi Morii

Osamu Naito

Toshiyuki Onishi

Satoru Serizawa

Masaaki Taniguchi

Teruko Shimada

Disclosed is an ammonia adsorption apparatus for removing ammonia contained in a treated gas discharged from a denitrator for decomposing nitrogen oxides present in exhaust gas using ammonia as a reducing agent, comprising at least two adsorption towers into which ammonia-containing exhaust gas is introduced in a vertical direction for removing the ammonia by adsorption, wherein, during regeneration of each adsorption tower, hot gas used for desorption purposes flows from a top toward a bottom of the adsorption tower and cooling gas flows from the bottom toward the top of the adsorption tower.

Ammonia adsorption apparatus

The object of the present invention is to provide a device to make flow uniform in a denitrification system, which can achieve a predetermined flow regulation effect with low pressure loss independently of the gas flow rate. According to the present invention, the device installed on the upstream side of a chemical injection means for the denitrification system is composed of at least one perforated plate 11, and the perforated plate 11 can be turned by a rotating shaft 10 or 10a from the closed position where the gas flow path is closed to the open position where the gas flow path is opened or vice versa.

Denitrification system

A high-performance rectifying device promotes the diffusion of energy, temperature and concentration in a fluid stream with a small pressure loss. The device is a lattice type rectifying device provided within a fluid flow passageway for equalizing the flow velocity distribution of the same fluid. Lattice elements each consist of two triangular plates disposed so as to form two opposed surfaces of a pyramid having its apex on the downstream side of the fluid flow and two other triangular plates forming two opposed surfaces of another pyramid having its apex jointed with the first-mentioned apex and having its bottom surface positioned on the downstream side of the fluid flow. The latter two opposed surfaces have their orientations deviated by 90 degrees from the two opposed surfaces on the upstream side. The lattice elements are arrayed in juxtaposition in directions perpendicular to the fluid flow with the orientation of adjacent lattice elements deviated by 90 degrees from each other and are connected in such a manner that the bottom surfaces of the above-mentioned pyramids may form a lattice. Furthermore the ratio of the length, in a direction parallel to the flow, of the lattice element to the breadth, in the direction perpendicular to the flow, of the lattice element should be kept in a range of 1.5-2.0. The lattice element may also be formed of a rectangular plate twisted by 90 degrees in the direction along the direction of the fluid flow.

Growing community of inventors

Nagasaki, Japan

Shigeyuki Nishijima