JP2010100491A - Device and method for carbon dioxide recovery - Google Patents

Device and method for carbon dioxide recovery Download PDF

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JP2010100491A
JP2010100491A JP2008274485A JP2008274485A JP2010100491A JP 2010100491 A JP2010100491 A JP 2010100491A JP 2008274485 A JP2008274485 A JP 2008274485A JP 2008274485 A JP2008274485 A JP 2008274485A JP 2010100491 A JP2010100491 A JP 2010100491A
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carbon dioxide
absorption tower
liquid
absorption
amount
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Yukio Ohashi
橋 幸 夫 大
Tadashi Yamanaka
中 矢 山
Hakaru Ogawa
川 斗 小
Katsuya Yamashita
下 勝 也 山
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Toshiba Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a carbon dioxide recovery device and method capable of reducing the recovery energy of an absorbing liquid in a recovery tower. <P>SOLUTION: The carbon dioxide recovery device is provided with an absorbing tower 1 for removing carbon dioxide from a carbon dioxide-containing gas by contacting the gas with a carbon dioxide-absorbing liquid, and a regeneration tower 2 which has a heater therefor and regenerates by heating, a carbon dioxide-rich liquid absorbing carbon dioxide in the absorbing tower. Besides, the device is composed so as to reuse in the absorbing tower, the carbon dioxide-lean liquid in which carbon dioxide is removed in the regeneration tower. The device and method are characterized in that a part of the absorbing liquid is extracted from the absorbing tower, and a line is provided to supply the extracted absorbing liquid to the top of the absorbing tower. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、二酸化炭素の回収装置および方法に係わり、とくに排ガスを吸収液と接触させて二酸化炭素を分離回収する装置および方法に関する。   The present invention relates to an apparatus and method for recovering carbon dioxide, and more particularly to an apparatus and method for separating and recovering carbon dioxide by bringing exhaust gas into contact with an absorbing solution.

近年、化石燃料の燃焼生成物である二酸化炭素の温室効果による地球温暖化の問題が大きくなっている。気候変動に関する国際連合枠組条約の京都議定書において、わが国の温室効果ガス排出削減の目標は、1990年比でマイナス６％を2008〜2012年の間に達成することになっている。   In recent years, the problem of global warming due to the greenhouse effect of carbon dioxide, which is a combustion product of fossil fuel, has been increasing. Under the Kyoto Protocol of the United Nations Framework Convention on Climate Change, Japan's target for reducing greenhouse gas emissions is to achieve minus 6% between 2008 and 2012 compared to 1990.

このような背景の中、大量の化石燃料を使用する火力発電所等を対象に、燃焼排ガスとアミン系吸収液とを接触させ、燃焼ガス中の二酸化炭素を分離回収する方法（アミン法）、および回収された二酸化炭素を大気中へ放出することなく貯蔵する方法が精力的に研究されている。   In such a background, for a thermal power plant that uses a large amount of fossil fuel, a method of contacting combustion exhaust gas with an amine-based absorbent and separating and recovering carbon dioxide in the combustion gas (amine method), In addition, methods for storing the recovered carbon dioxide without releasing it into the atmosphere have been intensively studied.

このような吸収液を用いて燃焼排ガスから二酸化炭素を分離回収する工程としては、吸収塔において燃焼ガスと吸収液とを接触させる工程、二酸化炭素を吸収した吸収液を再生塔において加熱し、二酸化炭素を吸収液から追い出すとともに吸収液を再生して吸収塔に循環し再使用するものがある（特許文献１）。
特開2004-323339号公報 The steps of separating and recovering carbon dioxide from combustion exhaust gas using such an absorption liquid include a step of bringing the combustion gas and the absorption liquid into contact with each other in the absorption tower, heating the absorption liquid that has absorbed the carbon dioxide in the regeneration tower, and There is one that expels carbon from the absorption liquid, regenerates the absorption liquid, circulates it in the absorption tower, and reuses it (Patent Document 1).
JP 2004-323339 A

二酸化炭素を分離回収する上記工程は、既設の発電設備等に付加して設置されるため、その運転コストをできるだけ低減させる必要がある。これまでの調査結果によると、発電量の20〜30%に相当するエネルギーが二酸化炭素の分離回収に必要とされている。   Since the above-described process for separating and recovering carbon dioxide is installed in addition to existing power generation facilities and the like, it is necessary to reduce its operating cost as much as possible. According to the survey results so far, energy equivalent to 20-30% of power generation is required for the separation and recovery of carbon dioxide.

特に、前記再生工程は、二酸化炭素を吸収した吸収液から二酸化炭素を追出すのに多量の熱エネルギーを必要とすることから、いかに熱エネルギーを最小にするかが重要である。   In particular, since the regeneration step requires a large amount of heat energy to expel carbon dioxide from the absorbing solution that has absorbed carbon dioxide, how to minimize the heat energy is important.

本発明は上述の点を考慮してなされたもので、再生塔での吸収液の加熱エネルギーを低減し得る二酸化炭素の回収装置および方法を提供することを課題とする。   The present invention has been made in consideration of the above points, and an object of the present invention is to provide a carbon dioxide recovery apparatus and method that can reduce the heating energy of the absorbent in the regeneration tower.

上記目的達成のため、本願は、次の装置および方法を提供するものである。   In order to achieve the above object, the present application provides the following apparatus and method.

まず、装置の発明としては、
二酸化炭素を含有するガスと二酸化炭素吸収液とを接触させて前記ガスから二酸化炭素を除去する吸収塔と、再生加熱器を有し前記吸収塔で二酸化炭素を吸収して二酸化炭素リッチになった吸収液を加熱することにより再生する再生塔とをそなえ、前記再生塔で二酸化炭素を除去して二酸化炭素リーンになった吸収液を前記吸収塔で再利用するようにした二酸化炭素回収装置であって、
前記吸収塔から前記吸収液の一部を抜取り、前記抜取った吸収液を前記吸収塔の頂部に供給するラインを設けた
ことを特徴とする二酸化炭素回収装置、
を提供する。また、方法の発明としては、
二酸化炭素を含有するガスと二酸化炭素吸収液とを接触させて前記ガスから二酸化炭素を除去して吸収液を二酸化炭素リッチな状態とし、次いで二酸化炭素リッチになった前記吸収液を加熱することにより再生するとともに二酸化炭素を回収する方法において、
前記吸収液の一部を抜取り、前記抜取った吸収液を前記二酸化炭素吸収液との接触工程に還流させるようにした
ことを特徴とする二酸化炭素回収方法、
を提供する。 First, as an apparatus invention,
An absorption tower that removes carbon dioxide from the gas by bringing a gas containing carbon dioxide into contact with a carbon dioxide absorption liquid, and a regeneration heater that absorbs carbon dioxide in the absorption tower and becomes rich in carbon dioxide. A carbon dioxide recovery apparatus comprising a regeneration tower that regenerates by heating the absorption liquid, and that removes carbon dioxide in the regeneration tower and recycles the absorption liquid that has become carbon dioxide lean in the absorption tower. And
A carbon dioxide recovery apparatus comprising a line for extracting a part of the absorption liquid from the absorption tower and supplying the extracted absorption liquid to a top of the absorption tower.
I will provide a. As a method invention,
By contacting a gas containing carbon dioxide with a carbon dioxide absorbing liquid to remove carbon dioxide from the gas to make the absorbing liquid rich, and then heating the carbon dioxide rich absorbing liquid. In a method of regenerating and recovering carbon dioxide,
A part of the absorption liquid is extracted, and the extracted absorption liquid is refluxed in a contact step with the carbon dioxide absorption liquid.
I will provide a.

本願発明の発明者らは、次の知見に基づき発明を完成した。   The inventors of the present invention completed the invention based on the following findings.

すなわち、再生塔にはできるだけ多くの二酸化炭素を吸収したリッチ液を供給すること、再生塔で全ての二酸化炭素を吸収液から追出すことは多大の熱エネルギーが必要になることに着目した。そして、必要最小限の吸収液で目標とする二酸化炭素の量を吸収させることができれば、リッチ液の量が少なくなることから、再生熱量が少なくてすむことになる。併せて、リーン液中に二酸化炭素をある程度含んでいても、システムとしては結果的に再生エネルギー低減が可能であることを見出した。   That is, it has been noted that supplying a rich liquid that absorbs as much carbon dioxide as possible to the regeneration tower and expelling all the carbon dioxide from the absorption liquid in the regeneration tower requires a great deal of thermal energy. If the target amount of carbon dioxide can be absorbed with the minimum amount of absorbing liquid, the amount of rich liquid is reduced, so that the amount of heat for regeneration can be reduced. In addition, the present inventors have found that even if the lean liquid contains carbon dioxide to some extent, the system can reduce the regenerative energy as a result.

本発明は上述のように、必要最低限の吸収液量でもって、最大限の二酸化炭素を吸収でき、再生エネルギーを最小に制御することができる。   As described above, the present invention can absorb the maximum amount of carbon dioxide with the minimum amount of absorption liquid, and can control the regeneration energy to the minimum.

以下、添付図面を参照して本発明の実施例につき説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

（実施例１）
図１を用いて本発明の第１の実施例を説明する。この第１の実施例は、二酸化炭素を含有するガス１４と二酸化炭素吸収液とを接触させて二酸化炭素を除去する吸収塔１と、二酸化炭素を吸収したリッチ溶液１５を再生加熱器３により再生する再生塔２と、再生塔２で二酸化炭素を除去したリーン溶液１６を吸収塔１で再利用するように構成されている。 Example 1
A first embodiment of the present invention will be described with reference to FIG. In the first embodiment, an absorption tower 1 that removes carbon dioxide by bringing a gas 14 containing carbon dioxide into contact with a carbon dioxide absorbing solution, and a rich solution 15 that has absorbed carbon dioxide is regenerated by a regeneration heater 3. The regenerator 2 is configured to recycle the regenerator 2 and the lean solution 16 from which carbon dioxide has been removed by the regenerator 2.

そして、リッチ溶液１５を吸収塔１から再生塔２に送るためにポンプ１１が、また再生塔２から吸収塔１にリーン溶液１６を送るためにポンプ１０が設けられている。この際、リッチ溶液１５、リーン溶液１６は、熱交換器７，８で熱交換される。例えば、熱交換器８と吸収塔１とを結ぶ配管には、化学吸収液であるアミン液のタンク１１０および水のタンク１２０が接続されていてもよい。   A pump 11 is provided for sending the rich solution 15 from the absorption tower 1 to the regeneration tower 2, and a pump 10 is provided for sending the lean solution 16 from the regeneration tower 2 to the absorption tower 1. At this time, the rich solution 15 and the lean solution 16 are heat-exchanged by the heat exchangers 7 and 8. For example, a pipe 110 connecting the heat exchanger 8 and the absorption tower 1 may be connected with a tank 110 of an amine liquid that is a chemical absorption liquid and a tank 120 of water.

また、再生塔２から排出される二酸化炭素ガスは、吸収液とともに熱交換器９を介して気液分離器４に送られ排出ガス６から二酸化炭素ガスが外部に回収されるとともに、吸収液は気液分離器４からポンプ１２を介して再生塔２に還流される。   The carbon dioxide gas discharged from the regeneration tower 2 is sent to the gas-liquid separator 4 through the heat exchanger 9 together with the absorption liquid, and the carbon dioxide gas is recovered from the exhaust gas 6 to the outside. The gas-liquid separator 4 is refluxed to the regeneration tower 2 via the pump 12.

また、この回収装置は、吸収塔１から吸収液の一部１４を抜出し、抜出した吸収液１４を吸収塔１の頂部に供給するラインを備える。吸収塔１から抜き出す量は、吸収液全体の１０ないし３０％程度が適当である。   In addition, the recovery device includes a line for extracting a part of the absorption liquid 14 from the absorption tower 1 and supplying the extracted absorption liquid 14 to the top of the absorption tower 1. The amount extracted from the absorption tower 1 is suitably about 10 to 30% of the entire absorbent.

通常、吸収塔１で二酸化炭素を吸収したリッチ液１５は、再生塔２で再生したリーン液１６と熱交換器７で熱交換した後、再生塔２へ供給される。この場合、リッチ液１５は、未だ二酸化炭素を十分に吸収する能力を持っていながら、再生塔２へ供給されることになる。この結果、二酸化炭素の単位質量当りでは多量の吸収液を使用することになり、再生エネルギーが大きくなる。   Usually, the rich liquid 15 having absorbed carbon dioxide in the absorption tower 1 is heat-exchanged with the lean liquid 16 regenerated in the regeneration tower 2 by the heat exchanger 7 and then supplied to the regeneration tower 2. In this case, the rich liquid 15 is supplied to the regeneration tower 2 while still having the ability to sufficiently absorb carbon dioxide. As a result, a large amount of absorption liquid is used per unit mass of carbon dioxide, and the regeneration energy increases.

この対策として、吸収塔１内の吸収液の一部を流量制御ポンプ１３により吸収塔１の頂部に戻すことにより、吸収液質量／ガス量は最適値でもって、リッチ液１５中の二酸化炭素量を高めることができる。   As a countermeasure, a part of the absorption liquid in the absorption tower 1 is returned to the top of the absorption tower 1 by the flow rate control pump 13, so that the absorption liquid mass / gas amount is the optimum value and the carbon dioxide amount in the rich liquid 15. Can be increased.

（実施例２）
図２は本発明の第２の実施例を示している。この実施例は、吸収塔１内の吸収液の一部を吸収塔１の頂部への戻す場合の戻し量を制御するものである。この制御を行うため、吸収塔１の出口には、二酸化炭素ガスの濃度を検出するためのセンサ１００が設けられており、このセンサ１００の検出値に基づいて吸収塔１への戻し量制御が行われる。ここで、センサ１００は、例えばリッチ液１５のＰＨ値、比重および温度を検出するものである。 (Example 2)
FIG. 2 shows a second embodiment of the present invention. In this embodiment, the return amount when a part of the absorption liquid in the absorption tower 1 is returned to the top of the absorption tower 1 is controlled. In order to perform this control, a sensor 100 for detecting the concentration of carbon dioxide gas is provided at the outlet of the absorption tower 1, and the return amount control to the absorption tower 1 is controlled based on the detection value of the sensor 100. Done. Here, the sensor 100 detects, for example, the PH value, specific gravity, and temperature of the rich liquid 15.

吸収塔１の出口５におけるリッチ液１５中の二酸化炭素量が、事前に調べた吸収液の二酸化炭素量に設定した領域から外れているかを計測器１７で判定し、設定域から外れた場合には制御器１８より吸収塔１からの液供給ライン２１による吸収液の液２２の量を制御し、リッチ液１５中の二酸化炭素量が設定領域内に収まるようにする。   When the measuring device 17 determines whether the amount of carbon dioxide in the rich liquid 15 at the outlet 5 of the absorption tower 1 is out of the region set in the carbon dioxide amount of the absorbing liquid examined in advance, and when it is out of the set region The controller 18 controls the amount of the absorbent liquid 22 through the liquid supply line 21 from the absorption tower 1 so that the amount of carbon dioxide in the rich liquid 15 falls within the set region.

すなわち、リッチ液１５中の二酸化炭素量が設定領域より小さい場合には吸収液の戻し量を増やし、逆にリッチ液１５中の二酸化炭素量が設定領域より大きい場合には吸収液の戻し量を減らすことになる。   That is, when the amount of carbon dioxide in the rich liquid 15 is smaller than the set area, the return amount of the absorbing liquid is increased. Conversely, when the amount of carbon dioxide in the rich liquid 15 is larger than the set area, the return amount of the absorbing liquid is increased. Will be reduced.

ここで、リッチ液１５中の二酸化炭素量の計測を(a)リッチ液１５のＰＨ値と温度で行う方法、(b)リッチ液１５の比重と温度で行う方法、(c)吸収塔入口１４におけるガス中の二酸化炭素濃度、および吸収塔出口５におけるガス中の二酸化炭素濃度およびリーン液１６中の二酸化炭素量を検出し、演算器１７により吸収塔入口１４と吸収塔出口５から求めた吸収塔１で吸収した二酸化炭素量とリーン液１６中の二酸化炭素流量の和で以って吸収塔出口におけるリッチ液中の二酸化炭素量を求める。ここで、リーン液１６中の二酸化炭素量は、上記(a)又は(b)の方法で計測する。   Here, the measurement of the amount of carbon dioxide in the rich liquid 15 is performed by (a) the method of performing the PH value and temperature of the rich liquid 15, (b) the method of performing the specific gravity and temperature of the rich liquid 15, and (c) the absorption tower inlet 14 The carbon dioxide concentration in the gas and the carbon dioxide concentration in the gas at the absorption tower outlet 5 and the amount of carbon dioxide in the lean liquid 16 are detected, and the absorption obtained from the absorption tower inlet 14 and the absorption tower outlet 5 by the calculator 17 is detected. The amount of carbon dioxide in the rich liquid at the absorption tower outlet is determined by the sum of the amount of carbon dioxide absorbed in the tower 1 and the flow rate of carbon dioxide in the lean liquid 16. Here, the amount of carbon dioxide in the lean solution 16 is measured by the method (a) or (b).

（実施例３）
図３は、本発明の第３の実施例の構成を示す接続図である。この実施例３は、次の知見に基づくものである。すなわち、再生塔２で液中の二酸化炭素を全て放出すると、必要とするエネルギー量の割には回収できる二酸化炭素量が少ない。このことから、再生塔２で再生した吸収液中に少量の二酸化炭素が含まれていた方が、二酸化炭素回収の再生エネルギー評価としては好ましいことになる。 (Example 3)
FIG. 3 is a connection diagram showing the configuration of the third embodiment of the present invention. This Example 3 is based on the following knowledge. That is, when all the carbon dioxide in the liquid is released in the regeneration tower 2, the amount of carbon dioxide that can be recovered is small for the amount of energy required. For this reason, it is preferable for the evaluation of the regeneration energy for carbon dioxide recovery that a small amount of carbon dioxide is contained in the absorbent regenerated by the regeneration tower 2.

この知見に基づく第３の実施例は、図３に示すように、再生塔２から吸収塔１に供給するリーン液１６中の二酸化炭素量を制御するようにしたものである。制御法としては、リーン液１６中の二酸化炭素量が設定領域になるように、再生塔２に供給する熱エネルギー３を制御する。   In the third embodiment based on this finding, as shown in FIG. 3, the amount of carbon dioxide in the lean liquid 16 supplied from the regeneration tower 2 to the absorption tower 1 is controlled. As a control method, the thermal energy 3 supplied to the regeneration tower 2 is controlled so that the amount of carbon dioxide in the lean liquid 16 falls within the set region.

すなわち、リーン液１６中の二酸化炭素量が設定領域より小さい場合は熱エネルギー３を小さく、逆にリーン液１６中の二酸化炭素量が設定領域より大きい場合は熱エネルギー３を大きくする。ここで、リーン液１６中の二酸化炭素量の計測は、(a)リーン液１６のＰＨ値と温度、または(b)リーン液１６の比重と温度、で行う。   That is, when the amount of carbon dioxide in the lean solution 16 is smaller than the set region, the thermal energy 3 is decreased, and conversely, when the amount of carbon dioxide in the lean solution 16 is greater than the set region, the thermal energy 3 is increased. Here, the measurement of the amount of carbon dioxide in the lean solution 16 is performed by (a) the PH value and temperature of the lean solution 16 or (b) the specific gravity and temperature of the lean solution 16.

（実施例４）
図４は、本発明の第４の実施例の構成を示す接続図である。上述の二酸化炭素分離回収装置において、長期運転においては吸収液の組成は副産物の生成、蒸気圧による飛散（主に水）等により変化することが考えられる。 Example 4
FIG. 4 is a connection diagram showing the configuration of the fourth embodiment of the present invention. In the above-described carbon dioxide separation and recovery apparatus, it is conceivable that the composition of the absorbent changes during long-term operation due to generation of by-products, scattering due to vapor pressure (mainly water), and the like.

そこで、第４の実施例では、吸収液の組成を維持するため、図４に示すように組成を維持するための液供給装置２０を設けた。この第４の実施例では、吸収塔１入口のリーン液１６の組成を計測器１７で計測し、その計測結果が演算器１８で所定の液組成から外れている場合には、供給液に成分と供給量を液供給装置２０に指示を出し、液供給装置２０から指令に応じて液をライン２１から供給する。   Therefore, in the fourth embodiment, in order to maintain the composition of the absorbing liquid, a liquid supply device 20 for maintaining the composition is provided as shown in FIG. In the fourth embodiment, the composition of the lean liquid 16 at the inlet of the absorption tower 1 is measured by the measuring instrument 17, and if the measurement result deviates from the predetermined liquid composition by the calculator 18, The supply amount is instructed to the liquid supply device 20, and the liquid is supplied from the line 21 according to the command from the liquid supply device 20.

図４では、吸収塔１入口で吸収液の組成が設計値に合うように制御した例を示しているが、この位置に限定するものではない。   Although FIG. 4 shows an example in which the composition of the absorbing solution is controlled so as to match the design value at the inlet of the absorption tower 1, it is not limited to this position.

本提案を説明する二酸化炭素回収装置の例を示す接続図。The connection figure which shows the example of the carbon dioxide collection device explaining this proposal. 本提案の実施例を説明するシステム構成を示す接続図。The connection diagram which shows the system configuration | structure explaining the Example of this proposal. 本提案の実施例を説明するシステム構成を示す接続図。The connection diagram which shows the system configuration | structure explaining the Example of this proposal. 本提案の実施例を説明するシステム構成を示す接続図。The connection diagram which shows the system configuration | structure explaining the Example of this proposal.

符号の説明Explanation of symbols

１ 吸収塔、２ 再生塔、３ 再生塔供給熱エネルギー、４ 気液分離器、
５ 吸収塔排出ガス、６ 再生塔排出ガス、７，８，９ 熱交換器、
１０，１１，１２，１３ ポンプ、１４ 吸収塔入口ガス、１５ リッチ液、
１６ リーン液、１７ 二酸化炭素量計測器、１８ 制御器、２０ 液供給装置、
２１ 液供給ライン、１００ センサ、１１０ アミン液タンク、１２０ 水タンク。 1 absorption tower, 2 regeneration tower, 3 regeneration tower supply heat energy, 4 gas-liquid separator,
5 Absorption tower exhaust gas, 6 Regeneration tower exhaust gas, 7, 8, 9 Heat exchanger,
10, 11, 12, 13 Pump, 14 Absorption tower inlet gas, 15 Rich liquid,
16 lean liquid, 17 carbon dioxide meter, 18 controller, 20 liquid supply device,
21 liquid supply line, 100 sensor, 110 amine liquid tank, 120 water tank.

Claims (9)

二酸化炭素を含有するガスと二酸化炭素吸収液とを接触させて前記ガスから二酸化炭素を除去する吸収塔と、再生加熱器を有し前記吸収塔で二酸化炭素を吸収して二酸化炭素リッチになった前記吸収液を加熱することにより再生する再生塔とをそなえ、前記再生塔で二酸化炭素を除去して二酸化炭素リーンになった前記吸収液を前記吸収塔で再利用するようにした二酸化炭素回収装置であって、
前記吸収塔から前記吸収液の一部を抜取り、前記抜取った吸収液を前記吸収塔の頂部に供給するラインを設けた
ことを特徴とする二酸化炭素回収装置。 An absorption tower that removes carbon dioxide from the gas by bringing a gas containing carbon dioxide into contact with a carbon dioxide absorption liquid, and a regeneration heater that absorbs carbon dioxide in the absorption tower and becomes rich in carbon dioxide. A carbon dioxide recovery device comprising a regeneration tower that regenerates by heating the absorption liquid, and that the carbon dioxide is removed in the regeneration tower and the absorption liquid that has become carbon dioxide lean is reused in the absorption tower. Because
A carbon dioxide recovery apparatus comprising a line for extracting a part of the absorption liquid from the absorption tower and supplying the extracted absorption liquid to the top of the absorption tower. 請求項１記載の二酸化炭素回収装置において、
前記ラインは、
前記吸収塔の出口における二酸化炭素リッチな吸収液の二酸化炭素量を、前記二酸化炭素リッチな吸収液のＰＨ値および温度により推定する推定手段と、
前記推定手段により推定された二酸化炭素量に基づき前記吸収塔から前記吸収塔の頂部への吸収液の戻し量を制御する制御器と
をそなえたことを特徴とする二酸化炭素回収装置。 The carbon dioxide recovery device according to claim 1,
The line is
Estimating means for estimating the amount of carbon dioxide in the carbon dioxide-rich absorption liquid at the outlet of the absorption tower from the PH value and temperature of the carbon dioxide-rich absorption liquid;
And a controller for controlling the return amount of the absorption liquid from the absorption tower to the top of the absorption tower based on the carbon dioxide quantity estimated by the estimation means. 請求項１記載の二酸化炭素回収装置において、
前記ラインは、
前記吸収塔の出口における二酸化炭素リッチな吸収液の二酸化炭素量を、前記二酸化炭素リッチな吸収液の比重および温度により推定する推定手段と、
前記推定手段により推定された二酸化炭素量に基づき前記吸収塔から前記吸収塔の頂部への吸収液の戻し量を制御する制御器と
をそなえたことを特徴とする二酸化炭素回収装置。 The carbon dioxide recovery device according to claim 1,
The line is
Estimating means for estimating the amount of carbon dioxide in the carbon dioxide-rich absorbent at the outlet of the absorption tower from the specific gravity and temperature of the carbon dioxide-rich absorbent;
And a controller for controlling the return amount of the absorption liquid from the absorption tower to the top of the absorption tower based on the amount of carbon dioxide estimated by the estimation means. 請求項１記載の二酸化炭素回収装置において、
前記ラインは、
前記吸収塔の入口におけるガス中の二酸化炭素濃度および前記吸収塔の出口におけるガス中の二酸化炭素濃度、ならびに二酸化炭素リーンになった吸収液中の二酸化炭素量を検出する検出手段と、
前記検出手段が検出した前記吸収塔の入口および出口で求めた二酸化炭素濃度から前記吸収塔が吸収した二酸化炭素量、ならびに前記吸収塔が吸収した二酸化炭素量と二酸化炭素リーンになった吸収液のＰＨ値および温度により推定した二酸化炭素リーンになった吸収液中の二酸化炭素流量との和でもって前記吸収塔の出口における二酸化炭素リッチな吸収液中の二酸化炭素量を求める演算器と
をそなえたことを特徴とする二酸化炭素回収装置。 The carbon dioxide recovery device according to claim 1,
The line is
Detecting means for detecting the carbon dioxide concentration in the gas at the inlet of the absorption tower and the carbon dioxide concentration in the gas at the outlet of the absorption tower, and the amount of carbon dioxide in the absorbent that has become carbon dioxide lean;
The amount of carbon dioxide absorbed by the absorption tower from the concentration of carbon dioxide determined at the inlet and outlet of the absorption tower detected by the detection means, and the amount of carbon dioxide absorbed by the absorption tower and the absorption liquid that has become carbon dioxide lean And a computing unit for determining the amount of carbon dioxide in the carbon dioxide-rich absorbing liquid at the outlet of the absorption tower in combination with the carbon dioxide flow rate in the absorbing liquid that has become carbon dioxide lean estimated by the pH value and temperature. A carbon dioxide recovery device characterized by that. 請求項１記載の二酸化炭素回収装置において、
前記ラインは、
前記吸収塔の入口におけるガス中の二酸化炭素濃度および前記吸収塔の出口におけるガス中の二酸化炭素濃度、ならびに二酸化炭素リーンになった吸収液中の二酸化炭素量を検出する検出手段と、
前記検出手段が検出した前記吸収塔の入口および出口で求めた二酸化炭素濃度から前記吸収塔が吸収した二酸化炭素量、ならびに前記吸収塔が吸収した二酸化炭素量と前記二酸化炭素リーンになった吸収液の比重と温度により推定した前記二酸化炭素リーンになった吸収液中の二酸化炭素流量との和でもって前記吸収塔の出口における二酸化炭素リッチな吸収液中の二酸化炭素量を求める演算器と
をそなえたことを特徴とする二酸化炭素回収装置。 The carbon dioxide recovery device according to claim 1,
The line is
Detecting means for detecting the carbon dioxide concentration in the gas at the inlet of the absorption tower and the carbon dioxide concentration in the gas at the outlet of the absorption tower, and the amount of carbon dioxide in the absorbent that has become carbon dioxide lean;
The amount of carbon dioxide absorbed by the absorption tower from the concentration of carbon dioxide determined at the inlet and outlet of the absorption tower detected by the detection means, and the amount of carbon dioxide absorbed by the absorption tower and the absorption liquid that has become the carbon dioxide lean And a calculator for determining the amount of carbon dioxide in the carbon dioxide-rich absorbing liquid at the outlet of the absorption tower by the sum of the specific gravity of the carbon dioxide and the carbon dioxide flow rate in the absorbing liquid in the carbon dioxide lean estimated by the temperature. A carbon dioxide recovery device characterized by that. 請求項１記載の二酸化炭素回収装置であり、前記再生塔から前記吸収塔に供給する二酸化炭素リーンになった吸収液中の二酸化炭素量が設定領域になるように前記再生塔に供給する熱エネルギーを制御する二酸化炭素回収装置において、
前記二酸化炭素リーンになった吸収液中の二酸化炭素量を前記二酸化炭素リーンになった吸収液のＰＨ値と温度により推定することを特徴とする二酸化炭素回収装置。 The thermal energy supplied to the regeneration tower according to claim 1, wherein the amount of carbon dioxide in the absorbing liquid that has become carbon dioxide lean supplied from the regeneration tower to the absorption tower is in a set region. In the carbon dioxide recovery device that controls
A carbon dioxide recovery device characterized in that the amount of carbon dioxide in the absorbent that has become carbon dioxide lean is estimated from the PH value and temperature of the absorbent that has become lean. 請求項１記載の二酸化炭素回収装置であって、前記再生塔から前記吸収塔に供給する二酸化炭素リーンになった吸収液中の二酸化炭素量が設定領域になるように前記再生塔に供給する熱エネルギーを制御する二酸化炭素回収装置において、
前記二酸化炭素リーンになった吸収液中の二酸化炭素量を前記二酸化炭素リーンになった吸収液の比重と温度により推定することを特徴とする二酸化炭素回収装置。 2. The carbon dioxide recovery apparatus according to claim 1, wherein the heat supplied to the regeneration tower is such that the amount of carbon dioxide in the absorbent that has become carbon dioxide lean supplied from the regeneration tower to the absorption tower becomes a set region. In a carbon dioxide recovery device that controls energy,
A carbon dioxide recovery device characterized by estimating the amount of carbon dioxide in the absorbent that has become carbon dioxide lean based on the specific gravity and temperature of the absorbent that has become carbon dioxide lean. 請求項１ないし７の何れかに記載の二酸化炭素回収装置において、
前記二酸化炭素リーンになった吸収液の組成を検出し、前記二酸化炭素リーンになった吸収液の組成を維持するため、前記二酸化炭素リーンになった吸収液の組成を計測する計測器および吸収液の濃度を調整する調整器をそなえたことを特徴とする二酸化炭素回収装置。 In the carbon dioxide recovery device according to any one of claims 1 to 7,
A measuring instrument for measuring the composition of the absorbent that has become carbon dioxide lean, and the absorbent for detecting the composition of the absorbent that has become carbon dioxide lean and maintaining the composition of the absorbent that has become lean carbon dioxide A carbon dioxide recovery device comprising a regulator for adjusting the concentration of the carbon dioxide. 二酸化炭素を含有するガスと二酸化炭素吸収液とを接触させて前記ガスから二酸化炭素を除去して吸収液を二酸化炭素リッチな状態とし、次いで二酸化炭素リッチになった前記吸収液を加熱することにより再生するとともに二酸化炭素を回収する方法において、
前記吸収液の一部を抜取り、前記抜取った吸収液を前記二酸化炭素吸収液との接触工程に還流させるようにした
ことを特徴とする二酸化炭素回収方法。 By contacting a gas containing carbon dioxide with a carbon dioxide absorbing liquid to remove carbon dioxide from the gas to make the absorbing liquid rich, and then heating the carbon dioxide rich absorbing liquid. In a method of regenerating and recovering carbon dioxide,
A part of the absorption liquid is extracted, and the extracted absorption liquid is refluxed in a contact step with the carbon dioxide absorption liquid.
JP2008274485A 2008-10-24 2008-10-24 Device and method for carbon dioxide recovery Pending JP2010100491A (en)

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WO2010116892A1 (en) * 2009-04-08 2010-10-14 株式会社 東芝 Measurement device, measurement method, and carbon dioxide recovery system
CN102527194A (en) * 2010-10-22 2012-07-04 株式会社东芝 Carbon dioxide separation recovery system and method of measuring amount of reboiler input heat
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WO2010116892A1 (en) * 2009-04-08 2010-10-14 株式会社 東芝 Measurement device, measurement method, and carbon dioxide recovery system
CN102527194A (en) * 2010-10-22 2012-07-04 株式会社东芝 Carbon dioxide separation recovery system and method of measuring amount of reboiler input heat
CN102527194B (en) * 2010-10-22 2014-10-15 株式会社东芝 Carbon dioxide separation recovery system and method of measuring amount of reboiler input heat
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US10518213B2 (en) 2011-12-01 2019-12-31 Kabushiki Kaisha Toshiba Carbon dioxide capturing apparatus, carbon dioxide capturing method, and amine compound capturing method
JPWO2013081126A1 (en) * 2011-12-01 2015-04-27 株式会社東芝 Carbon dioxide recovery device, carbon dioxide recovery method, and amine compound recovery method
US9248403B2 (en) 2012-06-20 2016-02-02 Kabushiki Kaisha Toshiba Carbon dioxide recovery device and carbon dioxide recovery method
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JP2015151319A (en) * 2014-02-17 2015-08-24 三菱重工業株式会社 Co2 recovery apparatus and co2 recovery method
WO2015122050A1 (en) * 2014-02-17 2015-08-20 三菱重工業株式会社 Co2 recovery apparatus, and co2 recovery method
US10449481B2 (en) 2014-02-17 2019-10-22 Mitsubishi Heavy Industries Engineering, Ltd. CO2 recovery unit and CO2 recovery method

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