JP6033999B2 - 選択的触媒還元プロセスの監視及び制御に関するシステム及び装置 - Google Patents
選択的触媒還元プロセスの監視及び制御に関するシステム及び装置 Download PDFInfo
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- JP6033999B2 JP6033999B2 JP2010289832A JP2010289832A JP6033999B2 JP 6033999 B2 JP6033999 B2 JP 6033999B2 JP 2010289832 A JP2010289832 A JP 2010289832A JP 2010289832 A JP2010289832 A JP 2010289832A JP 6033999 B2 JP6033999 B2 JP 6033999B2
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- laser
- reducing agent
- exhaust gas
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- ammonia
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- 238000010531 catalytic reduction reaction Methods 0.000 title claims description 24
- 238000012544 monitoring process Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title description 35
- 230000008569 process Effects 0.000 title description 17
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 270
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 130
- 239000003638 chemical reducing agent Substances 0.000 claims description 121
- 239000007789 gas Substances 0.000 claims description 89
- 238000002485 combustion reaction Methods 0.000 claims description 65
- 229910021529 ammonia Inorganic materials 0.000 claims description 61
- 238000002347 injection Methods 0.000 claims description 34
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000003054 catalyst Substances 0.000 claims description 9
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000003546 flue gas Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 2
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- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 230000003466 anti-cipated effect Effects 0.000 description 1
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- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
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- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
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- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- F01N2560/021—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting ammonia NH3
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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
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Immunology (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Pathology (AREA)
- Toxicology (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
本願の実施形態によっては、還元剤注入装置は、還元剤を空間的に制御された態様で注入するための手段を含み、還元剤の空間的に制御された注入は、窒素酸化物及びアンモニアの測定された濃度レベルの空間分布に関する計算された空間分布データに基づくものである。本願の実施形態によっては、還元剤を空間的に制御された態様で注入するための手段は、1)複数の還元剤注入場所が設けられるように燃焼排気ガス流の中へ突き出す複数の還元剤注入ノズル、又は2)上流側導管の周縁に沿って間隔をおいて配置される複数の還元剤注入ノズル、又は3)これらの両方を含み、また還元剤を空間的に制御された態様で注入するための手段は、窒素酸化物の濃度レベルが高い領域には高レベルの還元剤を注入し且つ窒素酸化物の濃度レベルが低い領域には低レベルの還元剤を注入する。
NO+NO2 +2NH3 →2N2 +3H2 O
4NO+O2 +4NH3 →4N2 +6H2 O
2NO2 +O2 +4NH3 →3N2 +6H2 O
に従って、NOxをN2 分子に変換することができる。ここで、過剰なNH3 が大気中へ逃散しないようにしながら全てのNOx(又は少なくともその適当な一部分)を変換するするためにアンモニアとNOxとのモル比の整合が望ましいことが認められよう。しかしながら、このことは、実際には、従来のSCRシステムの様々な制約により、達成するのが困難であることが判明している。
(It /I0)v=exp(−kvL)
ここで、kv (cm−1)は分光吸収係数である。隔離遷移iについて(レーザの場合)、
kv=pxabsSi(T)φv
ここで、P(atm(気圧))はガスの全圧力であり、xabs は関心のある吸収化学種のモル分率であり、Si(T)(cm−2atm−1)は温度T(K)における遷移の線強度であり、φv は線形関数(line shape function) である。線形関数φv は次式
化学種濃度(モル分率)は次式
上記の式は、分子密度がレーザの基準及び透過強度の関数であることを示している。
R=(pabsLφv1S1(T)φv)/(pabsLφv2S2(T)φv)
=(S1(T)φv1)/(S2 (T)φv2)
ここで、φv (cm)は特定のレーザ遷移の線形関数である。線形関数φv は次式
xwater=ln(I0/Iwater)v/PSi(T)L
アンモニアの場合、次式になる。
xNH3+water=ln(I0/INH3+water)v/PSi(T)L
従って、排気ガス中に存在するアンモニアの補正された濃度が次式のようになることが理解されよう。
xNH3=xNH3+water−xwater
図9に示されているように(且つアンモニア及びNOxの吸収波長を考慮して)、水蒸気についての実効吸収スペクトルがほぼ0.9〜1.5μmの波長で構成され得ることを発見した。より好ましい実施形態では、ほぼ1.1〜1.3μmの水蒸気吸収スペクトルを用いることができる。
114 選択的触媒還元(SCR)ユニット
116 内燃機関(ガスタービン・エンジン)
118 圧縮機
120 燃焼器
122 タービン
124 上流側導管
126 下流側導管
130 還元剤試験サンプル
132 NOx試験サンプル
136 制御ユニット
140 還元剤注入装置
200 SCRシステム
202 SCRユニット
204 下流側の波長可変ダイオード・レーザ吸収分光(TDLAS)ユニット
208 上流側の波長可変ダイオード・レーザ吸収分光(TDLAS)ユニット
212 還元剤注入装置
216 制御ユニット
300 波長可変ダイオード・レーザ吸収分光ユニット
302 レーザ・エミッタ
304 エミッタ 光学装置
306 レーザ検出器又はレシーバ
308 レシーバ 光学装置
310 レーザ通路
312 吸収媒質
400 導管
502 データ雲
602 データ雲
Claims (8)
- 内燃機関(116)の燃焼排気ガス流からの窒素酸化物及び還元剤の放出レベルを監視及び/又は制御するためのシステムであって、前記内燃機関(116)が選択的触媒還元ユニット(202)を含み、前記選択的触媒還元ユニット(202)は、燃焼排気ガス流を該選択的触媒還元ユニット(202)へ方向付ける上流側導管(124)と燃焼排気ガス流を該選択的触媒還元ユニット(202)から離れるように方向付ける下流側導管(126)との間で燃焼排気ガス流の中に配置されており、前記選択的触媒還元ユニット(202)は、燃焼排気ガスの中に含まれる窒素酸化物を、還元剤及び酸素の存在下で窒素原子へ触媒還元するように構成された触媒を持っていて、前記還元剤がアンモニアを有しており、また、前記内燃機関(116)が更に、前記選択的触媒還元ユニット(202)の上流の燃焼排気ガス流の中へ還元剤を注入する還元剤注入装置(212)を含んでおり、当該システムが、
前記下流側導管(126)内に配置されて、燃焼排気ガス流中の少なくとも窒素酸化物及び還元剤の濃度レベルを測定するように構成された第1の波長可変ダイオード・レーザ分光ユニット(204)と、
前記上流側導管(124)内の前記還元剤注入装置(212)より上流に配置された第2の波長可変ダイオード・レーザ分光ユニット(208)と、
制御ユニット(216)と
を含んでいて、
前記第1の波長可変ダイオード・レーザ分光ユニット(204)及び第2の波長可変レーザ分光ユニット(208)が、各々、燃焼排気ガス流中の少なくとも窒素酸化物の濃度レベルを測定して、窒素酸化物の測定濃度レベルに関する適時データを前記制御ユニット(216)へ供給するように構成され、
前記第1の波長可変ダイオード・レーザ分光ユニット(204)が、燃焼排気ガス流中の還元剤の濃度レベルを測定して、還元剤の測定濃度レベルに関する適時データを前記制御ユニット(216)へ供給するように構成されており、
前記下流側導管(126)が、該下流側導管(126)の内部をはさんで相対する第1及び第2の側面を含む断面形状を持ち、これらの第1及び第2の側面の各々は一連のポートを有していて、これらのポートは、該第1の側面上の複数のポートが該第2の側面上の複数のポートと対向するように配列されており、
前記第1の波長可変ダイオード・レーザ分光ユニット(204)が複数のレーザ・エミッタ(302)及び複数のレーザ・レシーバ(306)を含み、これらのエミッタ及びレシーバは、該レーザ・エミッタ(302)が前記下流側導管(126)の内部をはさんで前記レーザ・レシーバ(306)と対向するようにそれぞれの前記ポートに配置されており、
前記レーザ・エミッタ(302)が、所定の波長のレーザを放出して、該レーザが所定のレーザ通路に沿って進んで少なくとも1つのレーザ・レシーバ(306)によって受け取られるように構成されており、
前記レーザ・エミッタ(302)及び前記レーザ・レシーバ(306)の位置及び配向が、複数の交差するレーザ通路が作られるように設定されており、
前記レーザ通路が、少なくとも、a)前記レーザ・エミッタから前記下流側導管(126)の内部を真っ直ぐ横切って真向かいの前記レーザ・レシーバへ延在するレーザ通路、及びb)前記レーザ・エミッタから前記下流側導管(126)の内部を斜めに横切って真向かいではない位置の前記レーザ・レシーバ(306)の1つへ延在するレーザ通路を含んでおり、
また、前記レーザ・エミッタ(302)及び前記レーザ・レシーバ(306)の位置及び配向が、レーザ通路の交差点の場所が前記下流側導管(126)の断面積にわたってほぼ格子を形成するように設定されており、
前記適時データが、遅延時間が1秒未満のデータを有している、システム。 - 適時データは、遅延時間が0.1秒未満であるデータを有している、請求項1記載のシステム。
- 前記制御ユニット(216)は、窒素酸化物及びアンモニアの濃度レベルの空間分布に関する空間分布データを計算するように構成され、該空間分布データは、a)複数のレーザ通路の各々で測定された窒素酸化物及びアンモニアの濃度レベル間の変化、及びb)レーザ通路の交差点で計算される窒素酸化物及びアンモニアの推定濃度レベル間の変化を反映しており、該窒素酸化物及びアンモニアの推定濃度レベルは、公差してレーザ通路交差点を形成するレーザ通路の各々における窒素酸化物及びアンモニアの測定濃度レベルに基づくものである、請求項1又は請求項2記載のシステム。
- 前記所定の波長は、少なくとも、窒素酸化物に関する吸収波長とアンモニアに関する吸収波長とを有している、請求項1又は請求項2記載のシステム。
- 前記所定の波長は少なくとも水蒸気に関する吸収波長を有しており、
前記第1の波長可変ダイオード・レーザ分光ユニット(204)は水蒸気吸収波長に基づいて燃焼排気ガス流の温度を測定するように構成されている、請求項4記載のシステム。 - 前記制御ユニット(216)は、窒素酸化物及び還元剤の測定濃度レベルに基づいて前記還元剤注入装置が還元剤を燃焼排気ガス流に注入する速度を制御する、請求項1記載のシステム。
- 前記還元剤注入装置(212)は、還元剤を空間的に制御された態様で注入するための手段を有し、
前記還元剤の空間的に制御された注入は、窒素酸化物及びアンモニアの測定濃度レベルの空間分布に関する計算された空間分布データに基づくものである、請求項6記載のシステム。 - 還元剤を空間的に制御された態様で注入するための前記手段は、1)複数の還元剤注入場所が設けられるように燃焼排気ガス流の中へ突き出す複数の還元剤注入ノズル、又は2)前記上流側導管(124)の周縁に沿って間隔をおいて配置される複数の還元剤注入ノズル、又は3)これらの両方を有しており、
また、還元剤を空間的に制御された態様で注入するための前記手段は、窒素酸化物の濃度レベルが高い領域には高レベルの還元剤を注入し且つ窒素酸化物の濃度レベルが低い領域には低レベルの還元剤を注入するように構成されている、請求項7記載のシステム。
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US8424292B2 (en) | 2013-04-23 |
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US20110154806A1 (en) | 2011-06-30 |
CN102116192B (zh) | 2014-05-07 |
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