Gas-liquid contactor and co2-recovering apparatus provided therewith

Patent metadata

Field	Value
Publication number	US-2016199777-A1
Application number	US-201514889975-A
Country	US
Kind code	A1
Filing date	Jan 21, 2015
Priority date	Jan 31, 2014
Publication date	Jul 14, 2016
Grant date	—

Abstract

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.

First claim

1 . A gas-liquid contactor comprising:
a header pipe for supplying a liquid in a direction perpendicular to a vertical axis direction, the header pipe being installed above a packed bed contacting section through which an exhaust gas moves upward and passes; and spray nozzles for discharging spray water, the nozzles being installed, in an upward orientation, at predetermined intervals on the header pipe, wherein the spray water 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 liquid is made to contact the gas moving upward through the packed bed contacting section and is used to clear and remove water-soluble substances contained in the gas.

2 . The gas-liquid liquid contactor according to claim 1 ,
wherein a dispersion plate is integrally provided along an axial direction of a bottom part of the header pipe.

3 . The gas-liquid contactor according to claim 2 ,
wherein a lower end of the dispersion plate comes into contact with an upper surface of the packed bed contacting section.

4 . The gas-liquid contactor according to claim 1 ,
wherein partitions which partition the spray nozzles provided on the header pipe are provided in the shape of a double cross.

5 . The gas-liquid contactor according to claim 4 ,
wherein the packed bed contacting section is provided with partitions for packed bed contacting corresponding to the partitions.

6 . A CO 2 -recovering apparatus comprising:
an absorption tower which brings an exhaust gas containing CO 2 into contact with a CO 2 absorption liquid to remove CO 2 ; an absorption liquid regeneration tower which regenerates a rich solution, which has absorbed CO 2 , through heat exchange; a rich solution supply line through which the rich solution is extracted from the absorption tower and is introduced into the absorption liquid regeneration tower side; and a lean solution supply line through which a lean solution into which CO 2 regenerated in the absorption liquid regeneration tower has been emitted is extracted from the absorption liquid regeneration tower, and is introduced into the absorption tower, and the lean solution is reused as the CO 2 absorption liquid in the absorption tower, the absorption tower including: a CO 2 absorption section which brings the exhaust gas containing CO 2 into contact with the CO 2 absorption liquid and absorbs CO 2 in the exhaust gas; a main washing section which is disposed on an upper stage side of the CO 2 absorption section, cools a CO 2 -removed exhaust gas from which CO 2 has been removed, and recovers entrained CO 2 absorption liquid using washing water; a condensed water receiving section which is disposed on a lower side of the main washing section, and recovers the condensed water within the main washing section; and the gas-liquid contactor according to claim 1 which is provided on a lower stage side of the condensed water receiving section, and performs preliminary washing of the CO 2 -removed exhaust gas.

7 . A CO 2 -recovering apparatus comprising:
an absorption tower which brings an exhaust gas containing CO 2 into contact with a CO 2 absorption liquid to remove CO 2 ; an absorption liquid regeneration tower which regenerates a rich solution, which has absorbed CO 2 , through heat exchange; a rich solution supply line through which the rich solution is extracted from the absorption tower and is introduced into the absorption liquid regeneration tower side; and a lean solution supply line through which a lean solution into which CO2 regenerated in the absorption liquid regeneration tower has been emitted is extracted from the absorption liquid regeneration tower, and is introduced into the absorption tower, and the lean solution is reused as the CO 2 absorption liquid in the absorption tower, the absorption tower including: a CO 2 absorption section which brings the exhaust gas containing CO 2 into contact with the CO 2 absorption liquid and absorbs CO 2 in the exhaust gas; a main washing section which is disposed on an upper stage side of the CO 2 absorption section, cools a CO 2 -removed exhaust gas from which CO 2 has been removed, and recovers entrained CO 2 absorption liquid using washing water; a condensed water receiving section which is disposed on a lower side of the main washing section, and recovers the condensed water within the main washing section; and the gas-liquid contactor according to claim 1 which is provided on an upper stage side of the main washing section, and performs deep washing of the CO 2 -removed exhaust gas after passage through the main washing section.

8 . A CO 2 -recovering apparatus comprising:
an absorption tower which brings an exhaust gas containing CO 2 into contact with a CO 2 absorption liquid to remove CO 2 ; an absorption liquid regeneration tower which regenerates a rich solution, which has absorbed CO 2 , through heat exchange; a rich solution supply line through which the rich solution is extracted from the absorption tower and is introduced into the absorption liquid regeneration tower side; and a lean solution supply line through which a lean solution into which CO 2 regenerated in the absorption liquid regeneration tower has been emitted is extracted from the absorption liquid regeneration tower, and is introduced into the absorption tower, and the lean solution is reused as the CO 2 absorption liquid in the absorption tower, the absorption tower including: a CO 2 absorption section which brings the exhaust gas containing CO 2 into contact with the CO 2 absorption liquid and absorbs CO 2 in the exhaust gas; a main washing section which is disposed on an upper stage side of the CO 2 absorption section, cools a CO 2 -removed exhaust gas from which CO 2 has been removed, and recovers entrained CO 2 absorption liquid using washing water; a condensed water receiving section which is disposed on a lower side of the main washing section, and recovers the condensed water within the main washing section; the gas-liquid contactor according to claim 1 which is provided on a lower stage side of the condensed water receiving section, and performs preliminary washing of the CO 2 -removed exhaust gas; and the gas-liquid contactor according to claim 1 which is provided on an upper stage side of the main washing section, and performs deep washing of the CO 2 -removed exhaust gas after passage through the main washing section.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Tanaka Hiroshi
• Nagayasu Hiromitsu
• Hirata Takuya
• Yukumoto Atsuhiro
• Oishi Tsuyoshi
• Endo Takahiko
• Kawasaki Shimpei

Classifications

• B01D2252/204

  Amines · CPC title

• B01D53/1425

  Regeneration of liquid absorbents · CPC title

• B01D2258/0283

  Flue gases · CPC title

• B01D53/185 Primary

  Liquid distributors · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title