JP7397192B2 - 液化天然ガスプラントの運転条件決定方法及びそのシステム - Google Patents
液化天然ガスプラントの運転条件決定方法及びそのシステム Download PDFInfo
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- 239000003949 liquefied natural gas Substances 0.000 title claims description 127
- 238000000034 method Methods 0.000 title claims description 20
- 239000003507 refrigerant Substances 0.000 claims description 142
- 239000007789 gas Substances 0.000 claims description 94
- 239000000203 mixture Substances 0.000 claims description 68
- 238000004519 manufacturing process Methods 0.000 claims description 36
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 30
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
- 238000012545 processing Methods 0.000 claims description 16
- 239000000446 fuel Substances 0.000 claims description 15
- 238000004088 simulation Methods 0.000 claims description 15
- 239000001294 propane Substances 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000010801 machine learning Methods 0.000 claims description 7
- 239000013589 supplement Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 13
- 239000007921 spray Substances 0.000 description 12
- 238000012546 transfer Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 238000000926 separation method Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- 230000010365 information processing Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000013528 artificial neural network Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013136 deep learning model Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
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- 239000013535 sea water Substances 0.000 description 1
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- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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- F25J1/0055—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream originating from an incorporated cascade
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- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
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- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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- F25J1/0214—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle
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- F25J1/0216—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle with one SCR cycle using a C3 pre-cooling cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
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- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
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- F25J1/0255—Operation; Control and regulation; Instrumentation controlling particular process parameter, e.g. pressure, temperature controlling the composition of the feed or liquefied gas, e.g. to achieve a particular heating value of natural gas
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Description
生産効率=(HL+HC)/HF ・・・(1)
HL=hT-hB ・・・(2)
ただし、
HL:LNGプラント2で生産されるLNGの有効な質量流量の熱量換算値[kJ/h]
HC:分離設備40で分離されたフィードガスの重質分(図2中のL9を参照)の質量流量の熱量換算値[kJ/h]
HF:フィードガス(図2中のL0を参照)の質量流量の熱量換算値[kJ/h]
hT:LNGタンク57に導入されるLNG(図2中のL13を参照)の質量流量の熱量換算値[kJ/h]
hB:LNGタンク57から燃料として排出されるLNGのボイルオフガス(図2中のL30を参照)の質量流量の熱量換算値[kJ/h]
2 :液化天然ガスプラント
3 :運転条件決定装置
5 :ネットワーク
10 :運転支援画面
11 :オペレータ端末
12 :プラント制御装置
20 :プラント設備
22 :前処理設備
23 :予冷設備
24 :主熱交換器
27 :混合冷媒圧縮機
40 :分離設備
47 :シェル
48 :第1スプレーヘッダ
49 :第2スプレーヘッダ
51 :第1伝熱管
52 :第2伝熱管
53 :第3伝熱管
56 :第1膨張弁
57 :LNGタンク
58 :冷媒セパレータ
59 :第2膨張弁
61 :第3膨張弁
66 :冷却器
71~74:補充量調節弁
76~77:抜出量調節弁
81 :学習データ入力部
82 :制御部
83 :運転条件出力部
84 :記憶部
87 :学習処理部
88 :学習モデル
89 :運転条件決定部
91 :プラント運転データ
92 :プラントシミュレーションデータ
93 :プラント運転データ
94 :最適運転条件データ
101:プロセッサ
104:ストレージ
105:表示装置
106:入力装置
107:通信インタフェース
108:バス
110:運転支援画面
122:混合冷媒入口温度
123:LNG出口温度
124:フィードガス軽質分入口温度
Claims (9)
- 液化天然ガスプラントの運転条件決定方法であって、
前記液化天然ガスプラントは、
フィードガスの軽質分と混合冷媒との熱交換により、前記軽質分から液化天然ガスを生成する主熱交換器と、
前記液化天然ガスを貯留するタンクと、
前記フィードガス及び前記液化天然ガスの一部を燃料として駆動されることにより、前記混合冷媒を圧縮する圧縮機と、
を備え、
前記フィードガスの組成、前記混合冷媒の組成、及び周囲温度を含む運転条件データと、前記液化天然ガスの生産効率を含む運転結果データと、を対応づけた学習データを用いた機械学習によって生成された学習モデルを準備し、
前記学習モデルの生成では、前記学習データとして、過去の前記液化天然ガスプラントの運転によって得られた運転データが用いられ、前記運転データが不足している場合には、前記運転データを補完するデータとして前記液化天然ガスプラントの運転状況を模擬したシミュレーションモデルに基づき得られたシミュレーションデータが更に用いられ、
前記液化天然ガスプラントにおける前記フィードガスの最新の組成、及び最新の周囲温度から前記学習モデルによって予測される前記液化天然ガスの生産効率が最大となる前記混合冷媒の組成を新たな運転条件の1つとして決定する、方法。 - 前記生産効率は、前記フィードガスの流量またはその熱量換算値に対する、前記液化天然ガスの有効な流量またはその熱量換算値及び前記フィードガスの重質分の流量またはその熱量換算値の和の比であり、
前記液化天然ガスの有効な流量は、前記タンクに導入される前記液化天然ガスの流量から前記タンクから前記燃料として排出される前記液化天然ガスのボイルオフガスの流量を減じたものである、請求項1に記載の方法。 - 前記運転条件をオペレータに表示するための運転支援画面を生成する、請求項1または請求項2に記載の方法。
- 前記運転支援画面には、前記液化天然ガスプラントにおける前記混合冷媒の現在の組成の情報と、前記運転条件の1つとして決定された前記混合冷媒の候補組成の情報とが含まれる、請求項3に記載の方法。
- 前記混合冷媒には、窒素、メタン、及びプロパンがそれぞれ含まれ、
前記運転支援画面では、前記窒素及び前記プロパンに関する情報が強調表示される、請求項4に記載の方法。 - 前記運転支援画面には、前記主熱交換器における前記軽質分及び前記液化天然ガスの温度プロファイルが含まれる、請求項3から請求項5のいずれかに記載の方法。
- 前記主熱交換器における前記軽質分及び前記液化天然ガスの温度プロファイルには、前記軽質分が導入される前記主熱交換器の入口の温度と、前記液化天然ガスが排出される前記主熱交換器の出口の温度とがそれぞれ含まれ、
前記運転支援画面では、前記入口の温度及び前記出口の温度に関する情報が強調表示される、請求項6に記載の方法。 - 前記運転支援画面には、前記温度プロファイルを表示する表示領域が含まれ、
前記表示領域では、前記主熱交換器の各部における前記軽質分、前記液化天然ガス、及び前記混合冷媒の温度の現在値ならびに最適値がそれぞれ並べて表示されている、請求項6に記載の方法。 - 液化天然ガスプラントの運転条件決定システムであって、
前記液化天然ガスプラントは、
フィードガスの軽質分と混合冷媒との熱交換により、前記軽質分から液化天然ガスを生成する主熱交換器と、
前記液化天然ガスを貯留するタンクと、
前記フィードガス及び前記液化天然ガスの一部を燃料として駆動されることにより、前記混合冷媒を圧縮する圧縮機と、
を備え、
前記運転条件決定システムは、前記液化天然ガスプラントの運転条件を決定する処理を行うプロセッサを備え、
前記プロセッサは、
前記フィードガスの組成、前記混合冷媒の組成、及び周囲温度を含む運転条件データと、前記液化天然ガスの生産効率を含む運転結果データとを対応づけた学習データを用いた機械学習によって生成された学習モデルを準備し、
前記学習モデルの生成では、前記学習データとして、過去の前記液化天然ガスプラントの運転によって得られた運転データが用いられ、前記運転データが不足している場合には、前記運転データを補完するデータとして前記液化天然ガスプラントの運転状況を模擬したシミュレーションモデルに基づき得られたシミュレーションデータが更に用いられ、
前記液化天然ガスプラントにおける前記フィードガスの最新の組成、及び最新の周囲温度から前記学習モデルによって予測される前記液化天然ガスの生産効率が最大となる前前記混合冷媒の組成を新たな運転条件の1つとして決定する、システム。
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