JP2022528415A - 逆流反応器におけるco2回収による酸素燃焼 - Google Patents
逆流反応器におけるco2回収による酸素燃焼 Download PDFInfo
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- JP2022528415A JP2022528415A JP2021559068A JP2021559068A JP2022528415A JP 2022528415 A JP2022528415 A JP 2022528415A JP 2021559068 A JP2021559068 A JP 2021559068A JP 2021559068 A JP2021559068 A JP 2021559068A JP 2022528415 A JP2022528415 A JP 2022528415A
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Abstract
Description
種々の態様において、逆流反応器環境内で熱を提供するために酸素燃焼を使用するためのシステム及び方法が提供される。酸素燃焼のための酸素は、反応器中の酸素貯蔵成分に貯蔵される酸素によって提供されることが可能である。再生ステップの間に燃焼のための酸素を提供するために、酸素貯蔵成分を使用することによって、希釈剤の追加を減少又は最小化しながら、そして空気分離ユニットの必要性を回避しながら、逆流反応器に熱を加えることができる。その結果として、(空気分離ユニットを使用することなどによって)実質的に純粋な酸素含有ガス流を作成することの追加的な費用を必要とすることなく、CO2及び/又はH2Oから実質的に構成される再生燃焼ガスを形成することができる。
逆流反応器の再生の間に熱を提供するために酸素燃焼を実行することは、一般に複数の反応器を必要とする。1つの反応器(又は第1の複数の反応器)は、酸素貯蔵成分(金属酸化物)がアノード排気ガス流のH2及びCOなどの燃料の酸化(燃焼)のための酸化体として使用される再生ステップ中の反応器に相当することが可能である。第2の反応器(又は第2の複数の反応器)は、欠乏した酸素貯蔵成分(還元された金属酸化物)が酸素に暴露され、金属酸化物のより高い酸化状態の形態に戻って酸素貯蔵成分の酸化/変換を可能にする酸素貯蔵ステップ中の反応器に相当することが可能である。第3の反応器(又は第3の複数の反応器)は、酸素燃焼/再生ステップの間に反応器に添加される熱を使用する吸熱反応が生じる反応器に相当することが可能である。
逆流反応器及び/又は反応サイクルの異なる段階において反対方向のフローを有する他の反応器は、600℃以上又は800℃以上の温度などの高温で吸熱反応を実行する場合、有用となることが可能である。従来から、逆流反応器(又は反対方向のフローを有する他の反応器)は、反応器内の反応領域の1つ又はそれ以上の表面を所望の温度まで加熱するために使用される(燃料、酸素及び作業流体を含む)再生又は燃焼フローを有することが可能である。次いで、反対方向のフローを使用して、所望の吸熱反応のための試薬を通すことができる。再生ステップの間に反応器内に貯蔵される熱を使用して、所望の吸熱反応に熱を提供する。
炭化水素改質などの高温で作動される吸熱反応に関して、逆流反応器は、吸熱反応に熱を提供するために適切な反応環境を提供することが可能である。
図1は、逆流反応器を含む反応システムにおいて炭素回収を炭化水素改質と集積化するために適切な反応系の例を示す。図1に示される例において、反応システムは、複数の逆流反応器を含む。合計5つの反応器が図1に示されるが、いずれかの都合のよい数の反応器が使用可能であることは理解される。複数の反応器を使用することにより、反応生成物の連続又は実質的に連続な流れを、精製所、化学工場又は他の施設の下流部分へのインプットとして提供することが可能である。
逆流反応器システム中で実行可能な反応の例は、H2Oの存在下の蒸気改質条件下、CO2の存在下の乾燥改質条件下、又は反応環境中にH2O及びCO2の両方が存在する条件下での炭化水素の改質である。逆流反応器などのスイング反応器中での改質の間の作動の一般概要として、反応サイクルの再生ステップ又は部分を使用して反応器のための熱を提供することができる。次いで、改質はサイクルの改質ステップ又は部分の間に生じることが可能であり、改質反応によって、反応器再生ステップの間に提供された熱が消費される。
(1)乾燥改質:CH4+CO2=2CO+2H2
(2)蒸気改質:CH4+H2O=CO+3H2
(3)バイ改質:3CH4+2H2O+CO2=4CO+8H2。
いくつかの態様において、再生ステップのための燃料混合物への変更の1つは、炭化水素改質流出物からのH2の分離からのテールガスなどの、吸熱反応からの生成物の分離からのテールガスを添加することによって燃料を変性することであることが可能である。そのような態様において、改質流出物の加工及び分離を、CO含有が増加したテールガスを提供するように変更することも可能である。
(4)H2O+CO⇔H2+CO2
酸素貯蔵とそれに続く酸素燃焼を使用する逆流反応器の加熱は、ウォッシュコートとしてモノリスに適用された酸素貯蔵成分と一緒にモノリスを含む逆流反応器中で実行された。本実施例において、25グラムの酸化マンガンを次の仕様でアルミナ基材上にウォッシュコートした:1平方インチあたり100セル(cpsi)、55%の開口前面面積(OFA)、2.35インチの直径(D)及び6インチの長さ(L)。マンガンがコーティングされた基材をそれぞれ次の仕様でアルミナ基材(未コーティング)の2つの断片の間に積み重ねた:100cpsi、55%OFA、2.35のD、3インチのL。このアセンブリを垂直に配置された逆流反応器中に装填した。反応器は長さ12インチであった。
パイロットスケール反応器(約12インチ/約30cmの長さ)を使用して、逆流反応器システムの作動に及ぼす燃焼ガス出口温度の変更の影響及び利益を調査した。本明細書に提供される例は単一反応器からの結果に相当するが、当業者は複数の逆流反応器を含む反応システムへの以下の結果の適用を容易に理解するであろう。
実施形態1.吸熱反応を実行する方法であって、逆流反応器を任意選択的に含む反応器内の燃焼領域において、酸化マンガン、酸化鉄、酸化銅、酸化ニッケル又はその組合せを含む金属酸化物系、及び酸化マグネシウム、酸化カルシウム、酸化イットリウム又はその組合せを含むバインダーを含む酸素貯蔵成分に酸素含有流を暴露し、酸化された酸素貯蔵成分を形成すること;燃焼条件下で、燃料流及び作業流体を含み、20体積%以上のCO2を含む燃料混合物を、酸化された酸素貯蔵成分と反応させて、燃焼ガスを形成し、反応領域中の1つ又はそれ以上の表面を600℃以上の再生された表面温度まで加熱すること;燃焼ガスの少なくとも一部分をリサイクルして、作業流体の少なくとも一部分を形成すること;並びに再生された表面温度において、吸熱試薬流を反応領域の1つ又はそれ以上の表面に暴露して、吸熱生成物流を形成することを含み、反応領域中の吸熱試薬流の流れ方向が燃料混合物の流れ方向に対して逆である方法。
Claims (15)
- 吸熱反応を実行する方法であって、逆流反応器を任意選択的に含む反応器内の燃焼領域において、酸化マンガン、酸化鉄、酸化銅、酸化ニッケル又はその組合せを含む金属酸化物系、及び酸化マグネシウム、酸化カルシウム、酸化イットリウム又はその組合せを含むバインダーを含む酸素貯蔵成分に酸素含有流を暴露し、酸化された酸素貯蔵成分を形成すること;燃焼条件下で、燃料流及び作業流体を含み、20体積%以上のCO2を含む燃料混合物を、前記酸化された酸素貯蔵成分と反応させて、燃焼ガスを形成し、反応領域中の1つ又はそれ以上の表面を600℃以上の再生された表面温度まで加熱すること;前記燃焼ガスの少なくとも一部分をリサイクルして、前記作業流体の少なくとも一部分を形成すること;並びに前記再生された表面温度において、吸熱試薬流を前記反応領域の1つ又はそれ以上の表面に暴露して、吸熱生成物流を形成することを含み、前記反応領域中の前記吸熱試薬流の流れ方向が前記燃料混合物の流れ方向に対して逆である方法。
- 前記酸素貯蔵成分が、前記酸素貯蔵成分の重量に対して20重量%~80重量%の前記バインダーを含む、請求項1に記載の方法。
- 前記吸熱試薬流がH2Oを含み、且つ前記吸熱生成物流が、前記吸熱試薬流の温度より高温のH2Oを含む、請求項1又は2に記載の方法。
- 前記吸熱生成物流が吸熱反応生成物流を含む、請求項1~3のいずれか一項に記載の方法。
- 前記1つ又はそれ以上の表面が触媒組成物を含む、請求項1~4のいずれか一項に記載の方法。
- 前記1つ又はそれ以上の表面の少なくとも一部分が前記燃焼領域にある、請求項1~5のいずれか一項に記載の方法。
- 前記吸熱試薬流が炭化水素を含み、前記吸熱生成物流が改質流出物を含む、請求項1~6のいずれか一項に記載の方法。
- 前記改質流出物を水性ガスシフト反応条件に暴露して、シフトされた合成ガス生成物流を形成すること;及び圧力のスイング吸着によって前記シフトされた合成ガス生成物流を分離して、H2含有流及びCO2を含む流れを形成することをさらに含み、前記燃料混合物が、任意選択的に前記CO2を含む流れの少なくとも一部分を含む、請求項7に記載の方法。
- 前記燃焼ガスの少なくとも一部分をリサイクルして、前記作業流体の少なくとも一部分を形成することが、前記燃焼ガスを分離して、少なくともCO2含有流及び前記作業流体の少なくとも一部分を形成することを含む、請求項1~8のいずれか一項に記載の方法。
- 前記燃焼条件が0.5MPa-g~7.0MPa-gの燃焼圧力を含み、酸素貯蔵条件が、任意選択的に、前記燃焼圧力と3.0MPa未満まで異なる酸素貯蔵圧力を含む、請求項1~9のいずれか一項に記載の方法。
- 前記燃料混合物を反応させた後、及び前記1つ又はそれ以上の表面を前記吸熱試薬に暴露する前に、前記酸素貯蔵成分を補足酸素含有流に暴露することをさらに含む、請求項1~10のいずれか一項に記載の方法。
- 前記酸素含有流を前記酸素貯蔵成分に暴露することが、空気を前記酸素貯蔵成分に暴露して、欠乏空気流を形成することを含み、前記方法が、前記欠乏空気流をタービンの燃焼領域に通過させることをさらに含み、前記欠乏空気流が、任意選択的に12体積%~16体積%のO2を含む、請求項1~11のいずれか一項に記載の方法。
- 前記作業流体が25体積%以上のCO2を含む、請求項1~12のいずれか一項に記載の方法。
- 反応器入口端部と、再生器入口端部と、酸化マンガン、酸化鉄、酸化銅、酸化ニッケル又はその組合せを含む金属酸化物系、及び酸化マグネシウム、酸化カルシウム、酸化イットリウム又はその組合せを含むバインダーを含む酸素貯蔵成分を含む再生領域とを含む反応器;並びに前記反応器入口端部と前記再生器入口との間で断続的な流体連通を提供するリサイクルループを含む逆流反応器システムであって、前記リサイクルループが、リサイクル圧縮器、燃料源入口、酸素含有ガス入口及びCO2含有ガス出口を含む、逆流反応器システム。
- 前記酸素貯蔵成分が、前記酸素貯蔵成分の重量に対して20重量%~80重量%の前記バインダーを含む、請求項14に記載の逆流反応器システム。
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