Mitsubishi Heavy Industries Engineering, Ltd.

Mitsubishi Heavy Industries Limited

The Kansai Electric Power Co., Inc.

Shimpei Kawasaki

Takashi Kamijo

Hiroshi Tanaka

Takuya Hirata

Tsuyoshi Oishi

Osamu Miyamoto

Tatsuya Tsujiuchi

Hiromitsu Nagayasu

Atsuhiro Yukumoto

Masayuki Inui

Takahiko Endo

A COrecovery unit includes a COabsorber that brings a gas having a low COconcentration into countercurrent contact with a COabsorbent to remove COfrom the gas. The COrecovery unit further includes a first absorbent circulation line that supplies a COabsorbent from a first COabsorption section as a first circulation solution to an upper side of a first COabsorption section; a second absorbent circulation line that supplies a COabsorbent from a second COabsorption section as a second circulation solution to an upper side of a second COabsorption section; and an absorbent discharge line that discharges a part of the first circulation solution from the first absorbent circulation line and supply the part of the first circulation solution as a discharged solution to the second absorbent circulation section.

COrecovery unit and COrecovery method

A reduction device, an acid gas recovery device, a recovery device collector, and a first removed substance returning line are provided. The reduction device is configured to perform a reduction process to turn iron oxide to reduced iron by adding a reducing agent. The acid gas recovery device is configured to recover CObeing acid gas with COabsorbing liquid being acid gas absorbing liquid from exhaust gas containing at least powder-shaped iron-based solid substances and the acid gas, which are discharged from the reduction device. The recovery device collector is configured to collect the iron-based solid substance contained in the absorbing liquid with a filter. The iron-based solid substances collected by the recovery device collector are removed, and removed substances containing the removed iron-based solid substances are returned to the reduction device side through the first removed substance returning line.

Exhaust gas treatment system

A COrecovery device includes: a COabsorption tower in which COincluded in an exhaust gas is absorbed by a COabsorption liquid; and a COabsorption liquid regeneration tower that heats and regenerates the COabsorption liquid that has absorbed CO. The COabsorption liquid regeneration tower includes: a main body part in which the COabsorption liquid is temporarily stored; a boot part provided downward from a tank end of the main body part, having a relatively smaller capacity than the main body part; a flowmeter provided to the boot part, and measuring the liquid surface level of the COabsorption liquid that changes between the main body part and the boot part; and a control device controlling the liquid surface level of the COabsorption liquid between the main body part and the boot part on the basis of the measurement result of the flowmeter.

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A gas-liquid contactor is obtained by including a header pipe for supplying washing water, in a direction perpendicular to a vertical axis direction, the header pipe being disposed above a packed bed contacting section through which exhaust gas moves upward and passes; and spray nozzles for discharging spray water, the nozzles being disposed, in an upward orientation, with predetermined intervals on the header pipe. The spray water that has been discharged from the spray nozzles is supplied at a low liquid flow rate. The discharged spray water becomes a liquid film and falls downward along the surface of the header pipe, and then falls and spreads in the packed bed contacting section, so that the washing water is made to contact the exhaust gas moving upward through the packed bed contacting section. Accordingly, the washing water is used to clear and remove water-soluble substances contained in the exhaust gas.

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Tokyo, Japan

Shimpei Kawasaki