JP2007136341A - Concentration method of carbon dioxide and apparatus - Google Patents
Concentration method of carbon dioxide and apparatus Download PDFInfo
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- JP2007136341A JP2007136341A JP2005333802A JP2005333802A JP2007136341A JP 2007136341 A JP2007136341 A JP 2007136341A JP 2005333802 A JP2005333802 A JP 2005333802A JP 2005333802 A JP2005333802 A JP 2005333802A JP 2007136341 A JP2007136341 A JP 2007136341A
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Abstract
Description
本発明は、火力発電所等における燃焼排ガス等から発生する二酸化炭素を連続的に濃縮回収する方法及びその装置に関する。 The present invention relates to a method and apparatus for continuously concentrating and recovering carbon dioxide generated from combustion exhaust gas in a thermal power plant or the like.
排ガス中の二酸化炭素を除去することが行われる。二酸化炭素は発生源からの排出量も多いところから、一般的には、吸着法が採用されており、化学吸着法及び物理吸着法が行われ、膜分離法などの膜を用いる方法、深冷分離法などの温度差を利用するなど各種の方法が採用されている。これらはその処理方法に応じて固有の結果を得ている。
（1）化学吸着法：プラントとして最も多く採用されている。アミン系の吸収液と排ガスを接触させて、排気ガス中の二酸化炭素の分離に適している。水又はアルカリによる洗浄法がある（特開２００２−３６３５８０号、特開２０００−２７１４２１号）。水洗浄では非処理気体の吸収量が少ないことが問題とされる。化学吸着法には吸収液の開発、コスト等の問題点がある。
（2）物理吸着法：吸着剤による特定のガスの吸脱着を温度、圧力の操作で行う方法である。この方法には吸着剤の開発、効率、コスト等の問題点がある。
（3）膜分離法：高分子膜やセラミック膜等を用い、混合ガス中から特定ガスの選択透過により、ガスを回収する方法である。この方法には膜の開発、処理ガスのクリーン化、処理量が少ない等の問題がある（特開平３−２６７１０９．特開平６−３２７９３６）
（4）深冷分離法：この方法は混合ガスの各成分の沸点の違いを利用し、液化させることにより分離する方法である。この方法は大規模で高圧条件が必要である。このために、設備費等のコスト、高圧ガス保安法の問題がある。
これらは、比較的に安定した操作により処理することができるが、処理量が多く、経済的な運転が要望されている。
Removal of carbon dioxide in the exhaust gas is performed. Since carbon dioxide emits a large amount from the source, the adsorption method is generally adopted, and the chemical adsorption method and physical adsorption method are performed. Various methods such as using a temperature difference such as a separation method are employed. These have obtained unique results depending on the processing method.
(1) Chemisorption method: Most commonly used as a plant. It is suitable for separation of carbon dioxide in the exhaust gas by bringing the amine-based absorbent into contact with the exhaust gas. There are cleaning methods using water or alkali (JP 2002-363580, JP 2000-271421). In water cleaning, the problem is that the amount of non-treated gas absorbed is small. The chemical adsorption method has problems such as the development of the absorbing solution and cost.
(2) Physical adsorption method: A method of adsorbing and desorbing a specific gas with an adsorbent by operating temperature and pressure. This method has problems such as adsorbent development, efficiency, and cost.
(3) Membrane separation method: A method of recovering a gas by selective permeation of a specific gas from a mixed gas using a polymer membrane or a ceramic membrane. This method has problems such as development of a film, cleaning of a processing gas, and a small amount of processing (Japanese Patent Laid-Open No. 3-267109. Japanese Patent Laid-Open No. 6-327936).
(4) Cryogenic separation method: This method uses the difference in boiling points of the components of the mixed gas and separates them by liquefaction. This method requires large-scale and high-pressure conditions. For this reason, there are problems such as the cost of equipment and the high-pressure gas safety law.
These can be processed by a relatively stable operation, but the processing amount is large, and economical operation is desired.
排ガス中の二酸化炭素を高度に分離回収するに際し、安定で利用しやすい媒体を用いて低エネルギーの使用下に行うことができる二酸化炭素の分離回収方法及び装置の開発が望まれている。 When carbon dioxide in exhaust gas is highly separated and recovered, it is desired to develop a method and apparatus for separating and recovering carbon dioxide that can be performed using a stable and easy-to-use medium with low energy.
本発明の課題は、排ガス中より二酸化炭素を高い回収率で回収し、且つ、回収された二酸化炭素を高濃度で分離する排気ガス中の二酸化炭素の分離回収方法及び装置を提供することである。 An object of the present invention is to provide a method and apparatus for separating and recovering carbon dioxide in exhaust gas, which recovers carbon dioxide from exhaust gas at a high recovery rate and separates the recovered carbon dioxide at a high concentration. .
本発明者らは、火力発電所等における燃焼排気ガス中から発生する排気ガス中の二酸化炭素を含有する排ガスと水を加圧した状態で接触させて、水に二酸化炭素を吸収させ、二酸化炭素を吸収させた処理後ガスは放出し、二酸化炭素を含んだ水を大気圧状態の二酸化炭素回収部に導き、水に溶解している二酸化炭素をガスとして放出して二酸化炭素を回収し、二酸化炭素を放出した水は二酸化炭素吸収部の水として加圧して二酸化炭素吸収部に循環することにより、排ガスを清浄化し、二酸化炭素を濃縮回収することができることを見出して、本発明を完成させた。 The inventors of the present invention contact an exhaust gas containing carbon dioxide in exhaust gas generated from combustion exhaust gas in a thermal power plant or the like in a pressurized state so that water absorbs carbon dioxide, and carbon dioxide After the treatment, the gas is absorbed, water containing carbon dioxide is led to the atmospheric carbon dioxide recovery section, carbon dioxide dissolved in water is released as gas, and carbon dioxide is recovered. It was found that the water from which carbon was released was pressurized as water in the carbon dioxide absorption part and circulated to the carbon dioxide absorption part, thereby purifying exhaust gas and concentrating and recovering carbon dioxide, thereby completing the present invention. .
本発明は、具体的には、以下のとおりである。
（１）排ガスと水を加圧した状態で接触させて、水に二酸化炭素ガスを吸収させ、二酸化炭素を吸収させた処理後ガスは放出し、二酸化炭素を含んだ水を大気圧状態の二酸化炭素回収部に導き、水に溶解している二酸化炭素をガスとして放出して二酸化炭素を回収し、二酸化炭素を放出した水は二酸化炭素吸収部の水として加圧して二酸化炭素吸収部に循環することを特徴とする排ガスを清浄化し、二酸化炭素を濃縮回収する方法。
（２）前記排ガスがボイラーから発生する燃焼排ガスであることを特徴する（1）記載の排ガスを清浄化し、二酸化炭素を濃縮回収する方法。
（３）前記排ガスと水が１から３MPaの条件下に加圧されることを特徴とする（１）又は（２）記載の排ガスを清浄化し、二酸化炭素を濃縮回収する方法。
（４）排ガスと水を加圧した状態で接触させて水に二酸化炭素ガスを吸収させる二酸化炭素吸収装置及び二酸化炭素を含んだ水からガスとして放出する二酸化炭素を回収し、二酸化炭素を放出した水として回収する二酸化炭素回収装置からなり、二酸化炭素を放出した水を二酸化炭素吸収部の水として循環使用することを特徴とする排ガスを清浄化し、二酸化炭素を濃縮回収する装置。
（５）前記排ガスがボイラーから発生する燃焼排ガスであることを特徴する（４）記載の排ガスを清浄化し、二酸化炭素の濃縮回収する装置。
（６）前記排ガスと水が１から３MPaの条件下に加圧されることを特徴とする（４）又は（５）記載の排ガスを清浄化し、二酸化炭素を濃縮回収する装置。
Specifically, the present invention is as follows.
(1) The exhaust gas and water are brought into contact with each other in a pressurized state, the carbon dioxide gas is absorbed into the water, the treated gas that has absorbed the carbon dioxide is released, and the water containing the carbon dioxide is discharged into atmospheric pressure. Leads to the carbon recovery part, releases carbon dioxide dissolved in water as a gas, recovers carbon dioxide, and releases the carbon dioxide pressurizes as water in the carbon dioxide absorption part and circulates to the carbon dioxide absorption part A method for purifying exhaust gas and concentrating and recovering carbon dioxide.
(2) The method for purifying exhaust gas and concentrating and recovering carbon dioxide according to (1), wherein the exhaust gas is combustion exhaust gas generated from a boiler.
(3) The method of purifying exhaust gas and concentrating and recovering carbon dioxide according to (1) or (2), wherein the exhaust gas and water are pressurized under conditions of 1 to 3 MPa.
(4) A carbon dioxide absorption device that makes exhaust gas contact with water under pressure and absorbs carbon dioxide gas into water and collects carbon dioxide released as gas from water containing carbon dioxide, and releases carbon dioxide. A device for purifying exhaust gas and concentrating and recovering carbon dioxide, comprising a carbon dioxide recovery device that recovers as water, wherein the water from which carbon dioxide has been released is circulated and used as water in a carbon dioxide absorption part.
(5) The apparatus for purifying exhaust gas according to (4), wherein the exhaust gas is combustion exhaust gas generated from a boiler, and concentrating and recovering carbon dioxide.
(6) The apparatus for purifying exhaust gas and concentrating and recovering carbon dioxide according to (4) or (5), wherein the exhaust gas and water are pressurized under conditions of 1 to 3 MPa.
本発明の排ガス中の二酸化炭素を吸収し、二酸化炭素の濃縮・回収する方法及び装置によれば、二酸化炭素の回収濃度・回収率が高いことに加えて、全体として省エネルギー及びシステムの効率化を図ることができる。具体的には、水を高圧ポンプで循環することにより可能となる。他の二酸化炭素濃縮法では排ガスの処理効率が温度に依存するものが多いが、この方法は二酸化炭素の水への溶解度が大きいことを利用しており、温度の依存性は低く、二酸化炭素吸収装置の温度制御は必要としない。さらに、他の方法では処理ガスに水分が多いと二酸化炭素の濃縮効率が低下するため除湿の処理が必要であるが、この方法は水を媒体として用いるため処理ガスを除湿する必要が無い。このように、この方法は他の方法に比較して、処理ガスの前処理をする必要が無いこと、また、アミン系の吸収法等のように特殊な媒体を用いる必要が無いことから、エネルギー効率が高いと言える。
なお、本発明の方法は、発電所、製鉄所、セメント工場、等の工場から排出される排ガスからの二酸化炭素の分離回収に広く適応できる。
According to the method and apparatus for absorbing carbon dioxide in the exhaust gas of the present invention and concentrating / recovering carbon dioxide, in addition to the high concentration and recovery rate of carbon dioxide, overall energy saving and system efficiency can be improved. Can be planned. Specifically, it becomes possible by circulating water with a high-pressure pump. Many other carbon dioxide enrichment methods rely on temperature for the efficiency of exhaust gas treatment, but this method uses the high solubility of carbon dioxide in water, which is less dependent on temperature and absorbs carbon dioxide. No device temperature control is required. Furthermore, in other methods, if the processing gas contains a large amount of water, the concentration efficiency of carbon dioxide is reduced, so that dehumidification is necessary. However, since this method uses water as a medium, it is not necessary to dehumidify the processing gas. Thus, compared with other methods, this method does not require pretreatment of the processing gas and does not require the use of a special medium such as an amine-based absorption method. It can be said that the efficiency is high.
The method of the present invention can be widely applied to the separation and recovery of carbon dioxide from exhaust gas discharged from factories such as power plants, steel mills, and cement factories.
本発明の処理対象ガスは燃焼排ガスである。一般に燃焼排ガスは処理設備に導入するに先立ち、熱交換操作を施して、排ガスのもつ熱エネルギーを回収することが経済的である場合には回収して低温化されている。本発明で処理対象としている燃焼排ガスは、予め熱回収が施されて十分に低温化処理が施されているものである。具体的には、室内温度や大気温度よりやや高い程度であってもよい。不必要に低い温度である必要はない。燃焼排ガスは通常燃焼排ガスに含まれている炭素粒子やアッシュ成分は大気に放出してもさしつかない程度に処理が施されており、本発明の燃焼処理排ガスもその程度の処理は十分に施されているものである。
火力発電所等における燃焼排気ガスは、排気ガス中の二酸化炭素濃度は、通常約１５Vol％程度含有しており、本発明によれば８０Vol%程度の高濃度のガスを含んだ状態で連続的に回収することができる。この程度の排気ガス中の二酸化炭素濃度であれば、十分に対処できる。これを越す排気ガス中の二酸化炭素濃度であっても十分に対処できるし、低い場合であっても差し支えない。
この発明の装置及びプロセスは以下のとおりである。
The processing target gas of the present invention is combustion exhaust gas. In general, the combustion exhaust gas is recovered and lowered in temperature when it is economical to recover the thermal energy of the exhaust gas by performing a heat exchange operation prior to introduction into the treatment facility. The combustion exhaust gas to be treated in the present invention has been subjected to heat recovery in advance and sufficiently subjected to a low temperature treatment. Specifically, it may be slightly higher than the room temperature or the atmospheric temperature. It need not be unnecessarily low. Combustion exhaust gas is usually treated to such an extent that carbon particles and ash components contained in the combustion exhaust gas are not exposed to the atmosphere, and the combustion treatment exhaust gas of the present invention is sufficiently processed to that extent. It has been applied.
The combustion exhaust gas in a thermal power plant or the like usually contains about 15 Vol% of carbon dioxide in the exhaust gas, and according to the present invention, it continuously contains a high concentration of about 80 Vol%. It can be recovered. This level of carbon dioxide concentration in the exhaust gas can be dealt with sufficiently. Even the concentration of carbon dioxide in the exhaust gas exceeding this can be dealt with sufficiently, and even if it is low, there is no problem.
The apparatus and process of the present invention are as follows.
本発明の装置について図1を用いて説明する。
本発明の装置は、排ガス供給手段（４）から供給される排ガスは、輸送手段である高圧循環ポンプ（３）を介して供給される水（５）と、加圧した状態で接触させて二酸化炭素を処理した後ガス（６）と二酸化炭素を吸収した水（５）を分離する二酸化炭素吸収装置（１）及び二酸化炭素を含んだ水から二酸化炭素ガスをガスとして放出して二酸化炭素（７）を回収するとともに、二酸化炭素を放出した水（８）を回収する二酸化炭素回収装置（２）から構成され、二酸化炭素を放出した水を高圧循環ポンプ（３）により二酸化炭素吸収部の水として循環使用する。
The apparatus of the present invention will be described with reference to FIG.
In the apparatus of the present invention, the exhaust gas supplied from the exhaust gas supply means (4) is brought into contact with water (5) supplied via a high-pressure circulation pump (3) as a transport means in a pressurized state to produce carbon dioxide. After treating the carbon, the carbon dioxide absorbing device (1) for separating the gas (6) and the water (5) that has absorbed the carbon dioxide and carbon dioxide gas from the water containing the carbon dioxide are discharged as a carbon dioxide (7 ) And carbon dioxide recovery device (2) that recovers water (8) from which carbon dioxide has been released, and the water from which carbon dioxide has been released is used as water for the carbon dioxide absorber by the high-pressure circulation pump (3). Use it cyclically.
二酸化炭素吸収装置（１）は、槽として構成されている。槽には水を予めはっておく。
槽には底部から処理しようとする排ガスを供給する。排ガスが水と十分に接触せず、吹き抜けを防止するために必要とされる量が必要となる。これは排ガスの供給量、供給速度などにより、影響されると考えられる。実際の規模が決まれば、それに応じて実験などで適宜定めることができる値である。
槽に供給される水及び二酸化炭素は加圧下に保たれる。本発明では１から３MPaの条件下に加圧される。１MPa未満では、本発明の吸収の効果を得ることができない。装置を製造するに際しては３MPaを越える程度の装置を設計するようにすることは言うまでもない。燃焼排ガスの供給にはフィルタを介して供給する。
本発明の装置は実験室レベルの装置であり、純水を20cmの高さまで注入して実験を行った。処理ガス圧力を処理槽に所定の圧力まで圧入する。処理排ガスを送りながら、圧力を維持する。本発明では以下の条件で吸収槽は、運転される。
The carbon dioxide absorber (1) is configured as a tank. Put water in the tank in advance.
The tank is supplied with exhaust gas to be treated from the bottom. The exhaust gas does not come into sufficient contact with water, and the amount required to prevent blow-through is required. This is considered to be influenced by the supply amount and supply speed of exhaust gas. If the actual scale is determined, it is a value that can be appropriately determined through experiments or the like.
The water and carbon dioxide supplied to the tank are kept under pressure. In the present invention, the pressure is applied under conditions of 1 to 3 MPa. If it is less than 1 MPa, the absorption effect of the present invention cannot be obtained. Needless to say, when manufacturing a device, the device is designed to exceed 3 MPa. The combustion exhaust gas is supplied through a filter.
The apparatus of the present invention is a laboratory level apparatus, and an experiment was performed by injecting pure water to a height of 20 cm. The processing gas pressure is pressed into the processing tank to a predetermined pressure. The pressure is maintained while sending the treated exhaust gas. In the present invention, the absorption tank is operated under the following conditions.
具体的な実験方法は、二酸化炭素吸収装置（１）及び二酸化炭素回収装置（２）に純水を20cmの高さまで注入する。
排ガスを二酸化炭素吸収装置（１）に前記１から３MPaの圧力まで圧入する。処理ガスを送りながら、圧力を維持し、高圧循環ポンプ（３）で二酸化炭素吸収装置（１）と二酸化炭素回収装置（２）の水を循環させる。
二酸化炭素ガス濃縮装置は、主に、二酸化炭素吸収装置（１），二酸化炭素回収装置（２）、高圧循環ポンプ（３）、ガス制御部，ガス分析部、データ計測部等から成っている。
本発明の実験室レベルでの二酸化炭素吸収装置（１）及び二酸化炭素回収装置（２）は、内径6cm，高さ50cm，容積1400ml，最高使用圧力4MPaのポリカーボネート製である。各装置は上下のステンレス製カバーで締め付けており，上カバーには温度センサ，ガス排出口を，下カバーにはガス入口，水の入排出口を設けている。
濃度が15Vol%の二酸化炭素ガスはボンベより流量計，圧力制御器，圧力センサ及び高圧バルブを経て二酸化炭素吸収装置（１）に圧入する。二酸化炭素吸収装置（１）では水に吸収されるガスと処理後ガスとに分離され、処理後ガスはガス吸収装置（１）内の圧力が一定になるように放出される。ガスを吸収した水は二酸化炭素吸収装置（１）から二酸化炭素回収装置（２）へ調整バルブを経由して移動し、吸収した二酸化炭素ガスを放出する。ガスを放出した水は高圧循環ポンプ（３）で二酸化炭素吸収装置（１）へ戻す。放出されたガスは二酸化炭素回収装置（２）からガスメータを経由し、ガス分析を行った後に放出される。
二酸化炭素吸収装置（１）及び二酸化炭素回収装置（２）の圧力，温度及びガス経路における流量の各データは各センサで計測し，パーソナルコンピュータに収録する。
実験室レベルでの実験装置での手順は次の通りである。まず、二酸化炭素吸収装置（１）および二酸化炭素回収装置（２）の各20cmの位置まで純水を入れる（約0.5 ）。その後、二酸化炭素吸収装置（１）に濃度が15Vol%の二酸化炭素ガスを所定の圧力まで圧入する。二酸化炭素吸収装置（１）の圧力が一定になるように処理後ガスを放出させると同時に、二酸化炭素吸収装置（１）から二酸化炭素回収装置（２）へ水を放出させ、大気圧にすることにより、水に吸収した二酸化炭素ガスを放出させる。水は高圧循環ポンプ（３）で二酸化炭素回収装置（２）から二酸化炭素吸収装置（１）へ戻される。このように、二酸化炭素吸収装置（１）と二酸化炭素回収装置（２）から二酸化炭素吸収装置（１）へ水を循環させることにより、低濃度の二酸化炭素ガスが高濃度の二酸化炭素ガスとして連続的に回収するものである。
実験の期間中，ガスの入・排出経路に設置した流量計で流量を、圧力センサで圧力変化を，各装置内に設置した温度センサで気相，液相の温度変化を測定する。尚、実験は全て室温で行った。
As a specific experimental method, pure water is poured into a carbon dioxide absorption device (1) and a carbon dioxide recovery device (2) to a height of 20 cm.
The exhaust gas is pressed into the carbon dioxide absorber (1) to a pressure of 1 to 3 MPa. While sending the processing gas, the pressure is maintained, and the water in the carbon dioxide absorption device (1) and the carbon dioxide recovery device (2) is circulated by the high-pressure circulation pump (3).
The carbon dioxide gas concentrator mainly comprises a carbon dioxide absorber (1), a carbon dioxide recovery device (2), a high-pressure circulation pump (3), a gas control unit, a gas analysis unit, a data measurement unit, and the like.
The laboratory-level carbon dioxide absorption device (1) and carbon dioxide recovery device (2) of the present invention are made of polycarbonate having an inner diameter of 6 cm, a height of 50 cm, a volume of 1400 ml, and a maximum working pressure of 4 MPa. Each device is fastened with upper and lower stainless steel covers, with a temperature sensor and gas outlet on the upper cover, and a gas inlet and water inlet / outlet on the lower cover.
Carbon dioxide gas with a concentration of 15 Vol% is press-fitted from a cylinder into a carbon dioxide absorber (1) through a flow meter, pressure controller, pressure sensor and high pressure valve. In the carbon dioxide absorption device (1), the gas absorbed in water and the treated gas are separated, and the treated gas is released so that the pressure in the gas absorbing device (1) is constant. The water that has absorbed the gas moves from the carbon dioxide absorption device (1) to the carbon dioxide recovery device (2) via the regulating valve, and releases the absorbed carbon dioxide gas. The water from which the gas has been released is returned to the carbon dioxide absorber (1) by the high-pressure circulation pump (3). The released gas is released from the carbon dioxide recovery device (2) through the gas meter and after gas analysis.
Each data of the pressure, temperature and flow rate in the gas path of the carbon dioxide absorption device (1) and the carbon dioxide recovery device (2) is measured by each sensor and recorded in a personal computer.
The procedure in the laboratory apparatus at the laboratory level is as follows. First, pure water is put into the carbon dioxide absorption device (1) and the carbon dioxide recovery device (2) at positions of 20 cm each (about 0.5). Thereafter, carbon dioxide gas having a concentration of 15 Vol% is injected into the carbon dioxide absorber (1) to a predetermined pressure. Release the treated gas so that the pressure of the carbon dioxide absorption device (1) becomes constant, and simultaneously release water from the carbon dioxide absorption device (1) to the carbon dioxide recovery device (2) to bring it to atmospheric pressure. To release the carbon dioxide gas absorbed in the water. Water is returned from the carbon dioxide recovery device (2) to the carbon dioxide absorption device (1) by the high-pressure circulation pump (3). Thus, by circulating water from the carbon dioxide absorption device (1) and the carbon dioxide recovery device (2) to the carbon dioxide absorption device (1), low concentration carbon dioxide gas is continuously produced as high concentration carbon dioxide gas. To be collected.
During the experiment, the flow rate is measured with a flow meter installed in the gas inlet / outlet route, the pressure change is measured with a pressure sensor, and the temperature change of the gas phase and liquid phase is measured with a temperature sensor installed in each device. All experiments were performed at room temperature.
放出ガス、回収ガスの濃度変化
15Vol％二酸化炭素ガスの濃縮試験における二酸化炭素吸収装置（１）から放出した処理後ガス濃度変化を図2に、二酸化炭素回収装置（２）から回収したガス濃度の経時変化を図3に示す。いずれも10分間隔でガスクロマトグラフィで分析した結果である。実験条件は圧力が1MPa、水の循環量が100ml/minである。図2から、二酸化炭素吸収装置（１）の放出ガス濃度は処理ガス濃度15Vol％に対して、8.8Vol%まで低下している。図3から、回収ガスの濃度は78.7Vol%まで濃縮された。このときの二酸化炭素ガスの回収率は52.8％であった。処理ガスの平均流量は0.6 /minである。
Change in concentration of released gas and recovered gas
Fig. 2 shows the change in the concentration of the treated gas released from the carbon dioxide absorber (1) in the 15Vol% carbon dioxide gas concentration test, and Fig. 3 shows the change in the concentration of the gas recovered from the carbon dioxide recovery device (2) over time. Both are the results of gas chromatography analysis at 10 minute intervals. The experimental conditions are a pressure of 1 MPa and a water circulation rate of 100 ml / min. From FIG. 2, the emission gas concentration of the carbon dioxide absorption device (1) decreases to 8.8Vol% with respect to the treatment gas concentration of 15Vol%. From FIG. 3, the concentration of the recovered gas was concentrated to 78.7Vol%. The carbon dioxide gas recovery rate at this time was 52.8%. The average flow rate of the processing gas is 0.6 / min.
水の循環量と回収ガス濃度及び回収率
二酸化炭素吸収装置（１）の圧力を2MPaで水の循環量を100〜300ml/minに変化させたときの水の循環流量と回収ガス濃度及び回収率の関係を図4に示す。図から、二酸化炭素ガスの回収率は水の循環量を多くすると増加して、300ml/minで約90％を示した。回収ガス濃度は水の循環量にあまり依存せず、70〜80Vol%を示した。
Water circulation rate, recovery gas concentration, and recovery rate Water circulation rate, recovery gas concentration, and recovery rate when the pressure of the carbon dioxide absorber (1) is 2 MPa and the water circulation rate is changed from 100 to 300 ml / min. The relationship is shown in FIG. From the figure, the carbon dioxide gas recovery rate increased as the amount of water circulated increased and showed about 90% at 300 ml / min. The recovered gas concentration did not depend much on the amount of water circulated and was 70-80 Vol%.
二酸化炭素吸収装置（１）の圧力と回収ガス濃度及び回収率
水の循環量を200ml/minで二酸化炭素吸収装置（１）の圧力を1〜3MPaに変化させたときの圧力と回収ガス濃度及び回収率の関係を図5に示す。図から、二酸化炭素ガスの回収率は二酸化炭素吸収装置（１）の圧力を高くすると増加して、3MPaで90％を示した。回収ガス濃度は二酸化炭素吸収装置（１）の圧力にあまり依存せず、約80Vol%を示した。
Pressure and recovery gas concentration and recovery rate of carbon dioxide absorber (1) Pressure and recovery gas concentration when the water circulation rate is 200 ml / min and the pressure of carbon dioxide absorber (1) is changed to 1 to 3 MPa. The relationship of recovery is shown in FIG. From the figure, the carbon dioxide gas recovery rate increased as the pressure of the carbon dioxide absorber (1) was increased, showing 90% at 3 MPa. The recovered gas concentration did not depend much on the pressure of the carbon dioxide absorber (1), and was about 80 Vol%.
符号の説明
１ 二酸化炭素吸収装置
２ 二酸化炭素回収装置
３ 高圧循環ポンプ
４ 排ガス供給手段
５ 水
６ 二酸化炭素を処理した後ガス
７ 二酸化炭素
８ 水
９ フィルタ
DESCRIPTION OF
Claims (6)
6. The apparatus for purifying exhaust gas and concentrating and recovering carbon dioxide according to claim 4, wherein the exhaust gas and water are pressurized under conditions of 1 to 3 MPa.
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