JP2017532524A - 各種のガス供給源からlmgを生産する方法と装置{method and arrangement for producing liquefied methane gas from various gas sources} - Google Patents
各種のガス供給源からlmgを生産する方法と装置{method and arrangement for producing liquefied methane gas from various gas sources} Download PDFInfo
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- JP2017532524A JP2017532524A JP2017519735A JP2017519735A JP2017532524A JP 2017532524 A JP2017532524 A JP 2017532524A JP 2017519735 A JP2017519735 A JP 2017519735A JP 2017519735 A JP2017519735 A JP 2017519735A JP 2017532524 A JP2017532524 A JP 2017532524A
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Abstract
Description
−埋立地と嫌気性消化槽のメタンガス生産量に合わせるために年間400〜15,000MT程度のLMG生産能力に比べて小型化するのが難しく;
−供給ガスの窒素比率が低い時に長期間連続して行うことができず;
−投資費用とエネルギーの観点で費用が多くかかり;
−メタンガス供給源に関係なく一定した品質のLMGを生産するのが困難であり;
−工場で組み立てられて様々な現場に移して短時間に稼動させるためのプラントのような汎用プラントに適用するのが困難である。
Claims (24)
- 可変的な含量の窒素とメタンを含有した混合メタンガス供給ストリームからLMG(liquefied methane gas)を生産する方法であって、
(A)第1極低温冷媒を用いる第1熱交換器と第2極低温冷媒を用いる第2熱交換器に混合メタンガス供給ストリームを順に通過させて混合メタンガス供給ストリームの少なくとも一部を凝縮するステップ、
(B)第2熱交換器から出た混合メタンガス供給ストリームを分別蒸留カラムの中位の入口に送るステップ、
(C)混合メタンガス供給ストリームに窒素がある時、分別蒸留カラム内部の混合メタンガス供給ストリームを窒素高含有ガス留分とメタン高含有液体留分に分離するステップ、
(D)分別蒸留カラムの底に集まった(LMGを形成する)メタン高含有液体留分を底の出口を通して排出するステップ、
(E)(D)ステップで底の出口から出たLMGを第2極低温冷媒を用いる第3熱交換器に通過させてLMGをさらに冷却するステップ、
(F)(C)ステップの混合メタンガス供給ストリームに窒素が存在する時に下記の過程を行うステップ、
(i)分別蒸留カラムの上段出口を通して窒素高含有ガス留分を排出して窒素高含有ガス留分を生成し、
(ii)窒素高含有ガス留分を第1極低温冷媒を用いる第4熱交換器と、第2極低温冷媒を用いる第5熱交換器に順に通過させ、
(iii)第5熱交換器から出た窒素高含有ガス留分を窒素相分離器に送って液相と気相が分離され、
(iv)窒素相分離器の内部に集まった液相が排出され、重力によって分別蒸留カラムの中位の入口と上段出口との間の上部入口に入り、
(v)気相が窒素相分離器の内部から出て膨張バルブに入り、
(vi)膨張バルブから出た膨張ガスを第1極低温冷媒として用い、第1極低温冷媒は膨張バルブの出口から始まって第4熱交換器と第1熱交換器を順に通過する開ループである第1冷媒回路を循環し、
(vii)第1極低温冷媒が第1冷媒回路の第1熱交換器から出て排気され、
(G)独立極低温冷却システムから始まって第5熱交換器と第3熱交換器と第2熱交換器を経て独立極低温冷却システムに戻る閉ループである第2冷媒回路において第2極低温冷媒を循環させるステップを含むことを特徴とする方法。 - 第1冷媒回路から出た第1極低温冷媒が1vol%未満のメタンガスを含有することを特徴とする、請求項1に記載の方法。
- 第1冷媒回路から出た第1極低温冷媒が排気される時に大気中に直接排気されることを特徴とする、請求項1または2に記載の方法。
- (D)ステップで下段出口から排出されたLMGの窒素含量が2vol%未満、好ましくは1vol%未満であることを特徴とする、請求項1〜3のいずれか1項に記載の方法。
- 第1熱交換器に入る混合メタンガス供給ストリームの圧力が1,380kPag〜2,070kPagであることを特徴とする、請求項1〜4のいずれか1項に記載の方法。
- (C)ステップの混合メタンガス供給ストリームに窒素が存在する時、窒素高含有ガス留分の少なくとも一部が第5熱交換器の内部で液相への相変化を経ることを特徴とする、請求項1〜5のいずれか1項に記載の方法。
- (C)ステップの混合メタンガス供給ストリームに窒素が存在する時、窒素高含有ガス留分の残りの部分が第4熱交換器の内部で液相への相変化を経ることを特徴とする、請求項6に記載の方法。
- 混合メタンガス供給ストリームを分別蒸留カラムの内部で分離するステップにおいて混合メタンガス供給ストリームの一部を分別蒸留カラムの内部から外部のリボイラー回路を通して循環させ、リボイラー回路はバイパス回路を通してくる混合メタンガス供給ストリームと熱交換関係にある第6熱交換器を通過し、バイパス回路の入口と出口の両方とも第1熱交換器の下流と第2熱交換器の上流に位置することを特徴とする、請求項1〜7のいずれか1項に記載の方法。
- 混合メタンガス供給ストリームの少なくとも一部は埋立地と嫌気性消化槽のうち少なくとも一つから出るバイオガスであることを特徴とする、請求項1〜8のいずれか1項に記載の方法。
- 前記バイオガスが臨界値より少ない含量のメタンガスを含有する時、混合メタンガス供給ストリームの一部が他のメタンガス供給源から出るガスを含むことを特徴とする、請求項9に記載の方法。
- 窒素含量が3vol%未満である時に混合メタンガス供給ストリームに窒素がないことを特徴とする、請求項1〜10のいずれか1項に記載の方法。
- 可変的な含量の窒素とメタンを含有した混合メタンガス供給ストリームからLMGを生産する方法において、
(A)第1極低温冷媒を用いる第1熱交換器と第2極低温冷媒を用いる第2熱交換器に混合メタンガス供給ストリームを順に通過させて混合メタンガス供給ストリームの少なくとも一部を凝縮するステップ、
(B)第2熱交換器から出た混合メタンガス供給ストリームを分別蒸留カラムの中位の入口に送り、メタン高含有液体留分と窒素高含有ガス留分に分離するステップ、
(C)分別蒸留カラムの底に集まった(LMGを形成する)メタン高含有液体留分を底の出口を通して排出するステップ、
(D)(C)ステップで底の出口から出たLMGを第3熱交換器に通過させてLMGをさらに冷却するステップ、
(E)分別蒸留カラムの上段出口を通して窒素高含有ガス留分を排出して窒素高含有ガス留分を生成するステップ、
(F)窒素高含有ガス留分を第1極低温冷媒を用いる第4熱交換器と、第2極低温冷媒を用いる第5熱交換器に順に通過させ、窒素高含有ガス留分の少なくとも一部が第5熱交換器の内部で液相への相変化を経るステップ、
(G)第5熱交換器から出た窒素高含有ガス留分を窒素相分離器に送って液相と気相が分離されるステップ、
(H)窒素相分離器の底に集まった液相が排出され、重力によって分別蒸留カラムの中位の入口と上段出口との間の上部入口に入るステップ、
(I)気相が窒素相分離器の上段から出て膨張バルブに入るステップ、
(J)膨張バルブから出た膨張ガスを第1極低温冷媒として用い、第1極低温冷媒は膨張バルブの出口から始まって第4熱交換器と第1熱交換器を順に通過する開ループである第1冷媒回路を循環するステップ、
(K)第1極低温冷媒が第1冷媒回路の第1熱交換器から出て排気されるステップ、及び
(L)独立極低温冷却システムから始まって第5熱交換器と第3熱交換器と第2熱交換器を経て独立極低温冷却システムに戻る閉ループである第2冷媒回路において第2極低温冷媒を循環させるステップを含むことを特徴とする方法。 - 第1冷媒回路から出た第1極低温冷媒が1vol%未満のメタンガスを含有することを特徴とする、請求項12に記載の方法。
- 第1冷媒回路から出た第1極低温冷媒が排気される時に大気中に直接排気されることを特徴とする、請求項12または13に記載の方法。
- (C)ステップで下段出口から排出されたLMGの窒素含量が2vol%未満、好ましくは1vol%未満であることを特徴とする、請求項12〜14のいずれか1項に記載の方法。
- 第1熱交換器に入る混合メタンガス供給ストリームの圧力が1,380kPag〜2,070kPagであることを特徴とする、請求項12〜15のいずれか1項に記載の方法。
- 窒素高含有ガス留分の一部が第4熱交換器の内部で液相への相変化を経ることを特徴とする、請求項12〜16のいずれか1項に記載の方法。
- 混合メタンガス供給ストリームを分別蒸留カラムの内部で分離するステップにおいて混合メタンガス供給ストリームの一部を分別蒸留カラムの内部から外部のリボイラー回路を通して循環させ、リボイラー回路はバイパス回路を通してくる混合メタンガス供給ストリームと熱交換関係にある第6熱交換器を通過し、バイパス回路の入口と出口の両方とも第1熱交換器の下流と第2熱交換器の上流に位置することを特徴とする、請求項12〜17のいずれか1項に記載の方法。
- 混合メタンガス供給ストリームの少なくとも一部は埋立地と嫌気性消化槽のうち少なくとも一つから出るバイオガスであることを特徴とする、請求項12〜18のいずれか1項に記載の方法。
- 前記バイオガスが臨界値より少ない含量のメタンガスを含有する時、混合メタンガス供給ストリームの一部が他のメタンガス供給源から出るガスを含むことを特徴とする、請求項19に記載の方法。
- 可変的な含量の窒素とメタンを含有した混合メタンガス供給ストリームの生産装置において、
上段出口、下段出口、中位の入口、及び中位の入口と上段出口との間の上部入口を有する分別蒸留カラム、
混合メタンガス供給ストリーム回路の入口、第1熱交換器、第2熱交換器及び分別蒸留カラムの中位の入口の間に延びる混合メタンガス供給ストリーム回路、
分別蒸留カラムの下段出口、第3熱交換器及びLMG回路の出口の間に延びるLMG回路、
中位の入口、上段出口及び下段出口を有する窒素相分離器であって、窒素相分離器の下段出口が分別蒸留カラムの上部入口上に位置し、上部入口と連結される窒素相分離器、
窒素相分離器の上段出口に直接連結される膨張バルブ、
膨張バルブの入口、第4熱交換器、第1熱交換器及び第1冷媒回路の排気口を連結する開ループ第1冷媒回路、
独立極低温冷却システムの出口、第5熱交換器、第3熱交換器、第2熱交換器及び独立極低温冷却システムの入口を連結する閉ループ第2冷媒回路、及び
分別蒸留カラムの上段出口、第4熱交換器、第5熱交換器及び窒素相分離器の中位の入口を連結する窒素高含有ガス留分回路を含むことを特徴とする混合メタンガス供給ストリーム生産装置。 - 第6熱交換器及び分別蒸留カラムに連結されたリボイラー回路をさらに含み、前記リボイラー回路はバイパス回路を通してくる混合メタンガス供給ストリームと熱交換関係にある第6熱交換器を通過し、バイパス回路の入口と出口の両方とも混合メタンガス供給ストリーム回路において第1熱交換器の下流と第2熱交換器の上流に位置することを特徴とする、請求項21に記載の混合メタンガス供給ストリーム生産装置。
- LMG回路の出口が貯蔵タンク内に位置することを特徴とする、請求項21または22に記載の混合メタンガス供給ストリーム生産装置。
- 第1冷媒回路の排気口の上流に窒素熱回収交換器が位置することを特徴とする、請求項21〜23のいずれか1項に記載の混合メタンガス供給ストリーム生産装置。
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