Abstract: Included are a CO2 absorber for removing CO2 from a CO2-containing flue gas with a CO2 absorbent, an absorbent regenerator for regenerating the absorbent, a rich solution supply line for supplying the rich solution from the absorber to a rich solution supply portion of the regenerator, a rich/lean solution heat exchanger for exchanging heat between the rich solution and the lean solution, a first rich solution dividing line for dividing the rich solution at a first dividing portion in the rich solution supply line and supplying the divided rich solution at a first supply position on a side wall of the regenerator, a first rich solution heat exchanger for preheating the divided rich solution, and a first flow rate control device for controlling a flow rate of the divided rich solution such that the rich solution is preheated to a predetermined temperature in the first rich solution heat exchanger.

Abstract: An absorbing liquid which absorbs the CO2 or H2S or both contained in a gas, and which comprises 1) at least one tertiary-monoamine main agent selected from a tertiary-monoamine group and 2) at least one secondary-diamine first additive selected from a secondary-diamine group, the secondary-diamine concentration being within the range of 0.05 to 0.5 in terms of the additive concentration index represented by the following expression (I). (Additive concentration index)=[(secondary-diamine acid dissociation index) (pKa)/(tertiary-monoamine acid dissociation index) (pKa)](index ratio)×[(secondary-diamine molar concentration) (mol/L)/(tertiary-monoamine molar concentration) (mol/L)](molar ratio)??(I).

Abstract: An absorption column is equipped with: a CO2 absorption section absorbing CO2 from CO2-containing exhaust gas using a lean solution; a main rinse section recovering an entrained CO2 absorbent using rinse water; a rinse water circulation line circulating a rinse water containing the CO2 absorbent recovered in a liquid storage section of the main rinse section; a pre-rinse section provided between the CO2 absorption section and the main rinse section; a rinse section extraction liquid supply line extracting a portion of the rinse water containing the CO2 absorbent from the rinse water circulation line, and introducing the same into a reflux section of an absorption liquid regeneration tower; and a refluxed water supply line extracting a portion of refluxed water, introducing the same as pre-rinse water for the pre-rinse section, and connected on the pre-rinse section side.

Abstract: A CO2 recovery unit includes an absorber that reduces CO2 in flue gas (101) discharged from a combustion facility (50) by absorbing CO2 by an absorbent, a regenerator that heats the absorbent having absorbed CO2 to emit CO2, and regenerates and supplies the absorbent to the absorber, and a regenerating heater that uses steam (106) supplied from the combustion facility (50) for heating the absorbent in the regenerator and returns heated condensed water (106a) to the combustion facility (50). The CO2 recovery unit further includes a condensed water/flue gas heat exchanger (57) that heats the condensed water (106a) to be returned from the regenerating heater to the combustion facility (50) by heat-exchanging the condensed water (106a) with the flue gas (101) in a flue gas duct (51) in the combustion facility (50).

Abstract: A CO2 recovery unit includes a CO2 absorber in which a gas containing CO2 contacts a CO2-absorbing solution that absorbs the CO2 in the gas; a CO2-absorbing solution regenerator that heats the CO2-absorbing solution that has absorbed the CO2, releases the CO2 from the CO2-absorbing solution, and regenerates the CO2-absorbing solution; and at least one of a CO2 recovery rate controller that controls a difference between an actual measured value and a target value of a recovery rate of the CO2 to be within a predetermined range; and a CO2 recovery amount controller that controls a difference between an actual measured value and a target value of a recovery amount of CO2 to be within a predetermined range.

Abstract: A CO2 recovery unit includes a CO2-absorber that causes a gas containing CO2 to contact a CO2-absorbing solution and that causes the CO2 in the gas to be absorbed into the CO2-absorbing solution; a CO2-regenerator that heats the CO2-absorbing solution, releases the CO2 from the CO2-absorbing solution, and regenerates the CO2-absorbing solution; and a CO2 recovery amount controller that: calculates a computed target value of a CO2 recovery amount and a computed target value of a CO2 recovery rate based on a set value of the CO2 recovery rate, actual measured values of CO2 concentration, gas flow rate, and temperature of the gas, and calculates a maximum value of the CO2 recovery amount in the CO2-absorber and a maximum value of the CO2 recovery amount in the CO2-regenerator.

Abstract: A CO2 recovery system includes an absorption apparatus that brings a CO2 absorption liquid into contact with an exhaust gas treated by a pre-treatment apparatus so that CO2 in the exhaust gas is absorbed into the CO2 absorption liquid; a regeneration apparatus that separates CO2 from the CO2 absorption liquid; an absorption liquid circulation path that circulates the CO2 absorption liquid between the absorption apparatus and the regeneration apparatus; and an impurity removal unit that removes impurities having a high concentration in the absorption liquid circulation path, in the absorption liquid circulation path and/or in the pre-treatment apparatus in advance.

Abstract: A CO2 recovery unit includes an absorber that reduces CO2 in flue gas (101) discharged from a combustion facility (50) by absorbing CO2 by an absorbent, a regenerator that heats the absorbent having absorbed CO2 to emit CO2, and regenerates and supplies the absorbent to the absorber, and a regenerating heater that uses steam (106) supplied from the combustion facility (50) for heating the absorbent in the regenerator and returns heated condensed water (106a) to the combustion facility (50). The CO2 recovery unit further includes a condensed water/flue gas heat exchanger (57) that heats the condensed water (106a) to be returned from the regenerating heater to the combustion facility (50) by heat-exchanging the condensed water (106a) with the flue gas (101) in a flue gas duct (51) in the combustion facility (50).

Abstract: In a dehydration equipment, a regenerative gas heater heats a portion of CO2 gas dehydrated in an adsorption tower that is performing an adsorption process and supplies the gas to an adsorption tower that is performing a regeneration process. A regenerative gas preheater performs heat exchange between the CO2 gas that will be supplied to a regenerative gas heater and the CO2 gas sent out from the adsorption tower that is performing the regeneration process. Then, in the dehydration equipment, a regenerative gas cooler cools the CO2 gas that has been sent out from the adsorption tower that is performing the regeneration process and exchanged heat, separates water from the cooled CO2 gas, and returns the resulting gas to the adsorption tower. Thus, the dehydration equipment can prevent an increase in utility consumption due to the regeneration process.

Abstract: The CO2 recovery apparatus is provided with a CO2 absorption portion for absorbing CO2 in a CO2-containing exhaust gas by a CO2 absorbing liquid, a water washing portion provided on the upper portion side of the CO2 absorption portion so as to cool a CO2-removed exhaust gas and also recover the accompanying CO2 absorbing liquid, a washing liquid circulation line for directly circulating a washing liquid containing the CO2 absorbing liquid recovered in the water washing portion, an extraction line for extracting part of the washing liquid containing the CO2 absorbing liquid as an extracted liquid from the washing liquid circulation line, a concentration portion for separating a gas component (water vapor) from the extracted liquid while concentrating the CO2 absorbing liquid, and a concentrated liquid feed line for feeding a concentrated liquid concentrated in the concentration portion to the side of an absorbing liquid regeneration tower.

Abstract: A CO2 recovery device includes a cooling tower including a cooling unit for bringing the flue gas, which contains CO2, into contact with water so as to cool flue gas; a CO2-absorbing unit for bringing the flue gas into contact with a CO2 absorbent (lean solution) so as to remove CO2 from flue gas; and a regenerator including an absorbent regenerating unit for releasing CO2 from a rich solution so as to regenerate the CO2 absorbent. The CO2-absorbing unit includes: a cocurrent flow CO2-absorbing unit provided in a cocurrent flow CO2 absorber, for bringing the flue gas into contact with the CO2 absorbent in a cocurrent flow so as to remove CO2 from flue gas and a countercurrent CO2-absorbing unit provided in a CO2 absorber, for bringing the flue gas into contact with the CO2 absorbent in a countercurrent flow so as to remove CO2 from flue gas.

Abstract: SOx removal equipment 15 which reduces sulfur oxides from flue gas 12 from a boiler 11, a cooler 16 which is provided on the downstream side of the SOx removal equipment 15 so as to reduce the sulfur oxides from the flue gas and decrease a gas temperature, CO2 recovery equipment 17 which includes an absorber for bringing CO2 in the flue gas into contact with a CO2 absorption liquid so as to be reduced and a regenerator for causing the CO2 absorption liquid to emit CO2 so as to recover CO2 and regenerate the CO2 absorption liquid, and ammonia injection equipment 22 for reducing a mist generation material which is a generation source of mist that is generated in the absorber of the CO2 recovery equipment before introducing the flue gas to the CO2 recovery equipment, are included.

Abstract: A CO2 recovery unit includes an absorber that reduces CO2 in flue gas (101) discharged from a combustion facility (50) by absorbing CO2 by an absorbent, a regenerator that heats the absorbent having absorbed CO2 to emit CO2, and regenerates and supplies the absorbent to the absorber, and a regenerating heater that uses steam (106) supplied from the combustion facility (50) for heating the absorbent in the regenerator and returns heated condensed water (106a) to the combustion facility (50). The CO2 recovery unit further includes a condensed water/flue gas heat exchanger (57) that heats the condensed water (106a) to be returned from the regenerating heater to the combustion facility (50) by heat-exchanging the condensed water (106a) with the flue gas (101) in a flue gas duct (51) in the combustion facility (50).

Abstract: There is provided a dehydration-compression system 10 in which CO2 loss is suppressed, and a CO2 recovery system including the dehydration-compression system. The dehydration-compression system 10 of the present invention includes multiple compressors 50 and a dehydration device 60. The dehydration device 60 includes: a contactor 62 which removes H2O contained in CO2 by absorbing the H2O into an dehydration solvent; a recovery part 74 which recovers the CO2 from the dehydration solvent discharged from the contactor 62; and a first circulating passage L31 which carries the CO2 released from the recovery part 74 to the upstream side of the contactor 62.

Abstract: SOx removal equipment 15 which reduces sulfur oxides from flue gas 12 from a boiler 11, a cooler 16 which is provided on the downstream side of the SOx removal equipment 15 so as to reduce the sulfur oxides from the flue gas and decrease a gas temperature, CO2 recovery equipment 17 which includes an absorber for bringing CO2 in the flue gas into contact with a CO2 absorption liquid so as to be reduced and a regenerator for causing the CO2 absorption liquid to emit CO2 so as to recover CO2 and regenerate the CO2 absorption liquid, and ammonia injection equipment 22 for reducing a mist generation material which is a generation source of mist that is generated in the absorber of the CO2 recovery equipment before introducing the flue gas to the CO2 recovery equipment, are included.

Abstract: A CO2 recovery system includes an absorber 2 and a regenerator 3. The absorber 2 includes a CO2 absorbing section 21 and at least one water-washing section 22. The CO2 absorbing section 21 allows flue gas 101 to come into contact with a basic amine compound absorbent 103 so that the basic amine compound absorbent 103 absorbs CO2 in the flue gas 101. The at least one water-washing section 22 allows the decarbonated flue gas 101A in which the amount of CO2 has been reduced in the CO2 absorbing section 21 to come into contact with wash water 104A and 104B to reduce the amounts of the basic amine compounds entrained in the decarbonated flue gas 101A. The regenerator 3 releases the CO2 from the basic amine compound absorbent 103 containing CO2 absorbed therein.

Abstract: A regeneration tower 7 of a CO2 recovery unit includes an upper regeneration portion 51 that has a tray portion 45, a lower regeneration portion 52 provided below the upper regeneration portion 51 and having a liquid dispersion portion 46, and a supply line L5 that supplies absorbing liquid stored in the tray portion 45 to the liquid dispersion portion 46. The supply line L5 is provided with a heat exchanger 53, and the absorbing liquid is circulated using the density difference between the absorbing liquid flowing before the heat exchanger 53 and the absorbing liquid flowing after the heat exchanger 53 as a driving force. This reduces the cost of equipment while reducing the power in the delivery of the absorbing liquid in the regeneration portion.

Abstract: A gas-liquid contactor includes a plurality of spray nozzles provided in a CO2 absorber, for spraying a CO2 absorbent downward into the CO2 absorber in which flue gas drifts upward and passes so as to bring flue gas drifting upward and the CO2 absorbent into contact with each other. The spray nozzle includes a wall-surface dedicated nozzle provided along a wall surface in the CO2 absorber and a liquid dispersion nozzle provided inside of the wall-surface dedicated nozzle in the CO2 absorber.

Abstract: A CO2 recovery unit 10A according to a first embodiment has a CO2 absorber that removes CO2 in flue gas by bringing the flue gas containing CO2 into contact with a CO2 absorbent 12, and a regenerator 15 that diffuses CO2 in a rich solution 14 having absorbed CO2 in the CO2 absorber. The CO2 recovery unit 10A includes a first compressor 29-1 to a fourth compressor 29-4 that compress CO2 gas 16 discharged from the regenerator 15, a dehydrating column 33 that reduces moisture in the CO2 gas 16 by bringing the CO2 gas 16 into contact with a dehydrating agent 32, a combustion removal unit 41 that removes the dehydrating agent 32 mixed in the CO2 gas 16 in the dehydrating column 33, and a heat exchanger 42 that performs heat exchange between the CO2 gas 16 discharged from the third compressor 29-3 and the CO2 gas 16 discharged from the dehydrating column 33.

Abstract: There is provided a dehydration-compression system 10 in which CO2 loss is suppressed, and a CO2 recovery system including the dehydration-compression system. The dehydration-compression system 10 of the present invention includes multiple compressors 50 and a dehydration device 60. The dehydration device 60 includes: a contactor 62 which removes H2O contained in CO2 by absorbing the H2O into an dehydration solvent; a recovery part 74 which recovers the CO2 from the dehydration solvent discharged from the contactor 62; and a first circulating passage L31 which carries the CO2 released from the recovery part 74 to the upstream side of the contactor 62.