JPH01168319A - Nox reducer of exhaust gas of power generating diesel engine - Google Patents
Nox reducer of exhaust gas of power generating diesel engineInfo
- Publication number
- JPH01168319A JPH01168319A JP62327624A JP32762487A JPH01168319A JP H01168319 A JPH01168319 A JP H01168319A JP 62327624 A JP62327624 A JP 62327624A JP 32762487 A JP32762487 A JP 32762487A JP H01168319 A JPH01168319 A JP H01168319A
- Authority
- JP
- Japan
- Prior art keywords
- nox
- amount
- reducing agent
- gas
- diesel engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 40
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- 239000007789 gas Substances 0.000 claims description 59
- 238000010248 power generation Methods 0.000 claims description 15
- 230000003584 silencer Effects 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 2
- 229910052757 nitrogen Inorganic materials 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 118
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 40
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 13
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 238000005070 sampling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- SEPPVOUBHWNCAW-FNORWQNLSA-N (E)-4-oxonon-2-enal Chemical compound CCCCCC(=O)\C=C\C=O SEPPVOUBHWNCAW-FNORWQNLSA-N 0.000 description 1
- LLBZPESJRQGYMB-UHFFFAOYSA-N 4-one Natural products O1C(C(=O)CC)CC(C)C11C2(C)CCC(C3(C)C(C(C)(CO)C(OC4C(C(O)C(O)C(COC5C(C(O)C(O)CO5)OC5C(C(OC6C(C(O)C(O)C(CO)O6)O)C(O)C(CO)O5)OC5C(C(O)C(O)C(C)O5)O)O4)O)CC3)CC3)=C3C2(C)CC1 LLBZPESJRQGYMB-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Exhaust Gas After Treatment (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、複数の発電用ディーゼルエンジンから排出
される排ガスを脱硝装置により脱硝する発電ディーゼル
エンジン排ガスのＮＯｘ低減装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a NOx reduction device for power generation diesel engine exhaust gas, which denitrates exhaust gas discharged from a plurality of power generation diesel engines using a denitrification device.
従来、第２図に示す発電ディーゼルエンジン排ガスのＮ
Ｏｘ低減装置にあっては、自家発電用のディーゼルエン
ジンが複数台設備される場合、ディーゼルエンジン１か
ら排出される窒素酸化物（ＮＯｘ）を低減するため、脱
硝装置８を個々のディーゼルエンジン１に設置していた
。Conventionally, the N of the exhaust gas of the power generation diesel engine shown in Figure 2 was
Regarding the Ox reduction device, when multiple diesel engines for private power generation are installed, in order to reduce nitrogen oxides (NOx) emitted from the diesel engine 1, a denitrification device 8 is installed in each diesel engine 1. It was installed.
すなわち、ディーゼルエンジン１と消音器４との間の排
気ダクト３に脱硝装置８を設け、排気ダクト３に設けた
ガスサンプリング部７．１４からＮＯｘ計９、Ｎｏｘｉ
算出器算出及１０Ｏｘ計１５、ＮＯｘ比較器１６に接続
しであるＮＨ，！ （アンモニア）量算出器１９と、こ
のＮＨ，量算出器１９に印加される設定排出ＮＯｘ濃度
信号１７と、ＮＨｓＮ比較器２２、ＮＨ，流量発信器２
１ならびにコントローラ２３により、ＮＨ３流量調整バ
ルブ２４の開度を調整して脱硝装置８へのＮ Ｈ。That is, a denitrification device 8 is provided in the exhaust duct 3 between the diesel engine 1 and the muffler 4, and a NOx meter 9, NOx
Calculator calculation and 10Ox total 15, connected to NOx comparator 16, NH,! (ammonia) amount calculator 19, this NH, set exhaust NOx concentration signal 17 applied to the amount calculator 19, NHsN comparator 22, NH, flow rate transmitter 2
1 and the controller 23 adjust the opening degree of the NH3 flow rate adjustment valve 24 to supply NH to the denitrification device 8.
注入量を制御するようになっている。The injection volume is controlled.
なお、第２図図中の符号１１はガス量算出器である。Note that the reference numeral 11 in FIG. 2 is a gas amount calculator.
また、第３図は、実開昭５８−１０８３４号公報に開示
される「アンモニア注入制御装置Ｊであって、「排煙脱
硝装置へ注入するアンモニアの量を制御するアンモニア
注入制御装置において、バーナ点消火により０Ｎ−ＯＦ
Ｆして、信号発生器２６からの信号を断続させて微分器
２７へ入力するスイッチ２８を設け、前記微分器２７の
出力をアンモニア流量制御信号へ加算するように構成し
たｊものである。FIG. 3 shows an "ammonia injection control device J" disclosed in Utility Model Application Publication No. 58-10834, which is an ammonia injection control device for controlling the amount of ammonia injected into a flue gas denitrification device. 0N-OF due to ignition extinguishing
F, a switch 28 is provided to intermittently input the signal from the signal generator 26 to the differentiator 27, and the output of the differentiator 27 is added to the ammonia flow rate control signal.
さらにまた、第４図は、特開昭６２−７１５１７号公報
に開示される「燃焼排ガスの脱硝法」であって、「ボイ
ラー２９等の排ガスの脱硝に当り、火炉に続く脱硝室３
０で排ガス中に還元剤を噴霧して脱硝すると共に、該排
ガスを木管群３１を介して煙道３２に導き、他方前記木
管群３Ｉの排ガス流れ方向上流部から排ガスの一部を取
り出し、これを前記煙道３２の排ガスと混合して触媒槽
３３に供給し、ｗＬ硝するｊものである。Furthermore, FIG. 4 shows the "denitrification method for combustion exhaust gas" disclosed in Japanese Unexamined Patent Publication No. 62-71517.
At 0, a reducing agent is sprayed into the exhaust gas to denitrate the exhaust gas, and the exhaust gas is guided to the flue 32 through the wood pipe group 31, while a part of the exhaust gas is taken out from the upstream part of the wood pipe group 3I in the exhaust gas flow direction. is mixed with the exhaust gas from the flue 32 and supplied to the catalyst tank 33, where it is oxidized.
しかし、第２図の従来例の場合、自家発電用のディーゼ
ルエンジン１個々に脱硝装置８を設置するため、脱硝装
置８設置のためのスペースが多くなり、かつ、イニシャ
ルコストも高（なる。また、脱硝装置８を設置しない場
合、ディーゼルエンジン１のＮＯｘ排出量が多いことよ
り、ディーゼルエンジン１の運転時間が制限され、廃熱
回収システムを有効に活用できないという問題点がある
。However, in the case of the conventional example shown in FIG. 2, the denitrification device 8 is installed in each diesel engine 1 for private power generation, so the space for installing the denitrification device 8 is large, and the initial cost is also high. If the denitrification device 8 is not installed, there is a problem that the operating time of the diesel engine 1 is limited due to the large amount of NOx emitted by the diesel engine 1, and the waste heat recovery system cannot be used effectively.
そこで、このような問題点を解決するため、この発明は
、複数の発電用のディーゼルエンジンに設置する脱硝装
置を統合することにより、設備費を低減することを目的
とする。Therefore, in order to solve such problems, the present invention aims to reduce equipment costs by integrating denitrification devices installed in a plurality of diesel engines for power generation.
そのため、この発明は上述の問題点を、複数のディーゼ
ルエンジンのいずれか一方の排気ダクトに脱硝装置を設
け、集合排気ダクトに設置したＮＯｘ計とガス量演算器
を過剰ＮＯｘ量算出器及び還元剤補正器に接続して、還
元剤注入量補正器と還元剤流量発信器からの各信号を還
元剤量比較器により比較し、１系統に集約した脱硝装置
への還元剤の注入量を制御することにより解決しようと
するものである。Therefore, the present invention solves the above-mentioned problem by installing a denitrification device in one of the exhaust ducts of a plurality of diesel engines, and replacing the NOx meter and gas amount calculator installed in the collective exhaust duct with an excess NOx amount calculator and a reducing agent. Connected to a corrector, each signal from the reducing agent injection amount corrector and reducing agent flow rate transmitter is compared by the reducing agent amount comparator, and the amount of reducing agent injected into the denitration equipment integrated into one system is controlled. This is what we are trying to solve.
さらに詳しくは、第１図の符号を付して説明すると、複
数の発電用のディーゼルエンジンから排出される排ガス
を脱硝装置により脱硝する発電ディーゼルエンジン排ガ
スのＮ Ｏｘ 低減袋Ｗにおいて、複数のディーゼルエ
ンジン１．２を排気ダクト３ａ、３ｂにより消音器４に
通じる集合排気ダクト５に連通させ、複数のディーゼル
エンジンのいずれか一方の排気ダク）３ｂに脱硝装置８
を設けて、各ディーゼルエンジン１．２にそれぞれ備え
たガス量算出器１２．１１をガス量演算器１３に接続し
、しかも、前記集合排気ダクト５に設置したＮＯｘ計１
５と前記ガス量演算器１３を過剰ＮＯＸ量算出器１８に
接続するとともに、この過剰ＮＯｘ量算出器１８及び還
元剤量算出器１９と脱硝装置８に近接して設けたＮＯｘ
量算出器１０に還元剤注入量補正器２０を連結し、この
還元剤注入量補正器２０により補正された還元剤注入量
信号と、還元剤流量発信器２１よりの還元剤流量信号と
を還元剤量比較器２２により比較して、脱硝装置８への
還元剤の注入量を制御するようにしたものである。More specifically, referring to the reference numerals in FIG. 1, in the NOx reduction bag W for power generation diesel engine exhaust gas in which the exhaust gas discharged from a plurality of power generation diesel engines is denitrified by a denitrification device, a plurality of diesel engines 1.2 is connected to a collective exhaust duct 5 leading to a muffler 4 through exhaust ducts 3a and 3b, and a denitrification device 8 is connected to one of the exhaust ducts 3b of the plurality of diesel engines.
The gas amount calculator 12.11 provided in each diesel engine 1.2 is connected to the gas amount calculator 13, and the NOx meter 1 installed in the collective exhaust duct 5 is connected to the gas amount calculator 13.
5 and the gas amount calculator 13 are connected to the excess NOx amount calculator 18, and the NOx
A reducing agent injection amount corrector 20 is connected to the amount calculator 10, and the reducing agent injection amount signal corrected by the reducing agent injection amount corrector 20 and the reducing agent flow rate signal from the reducing agent flow rate transmitter 21 are reduced. The amount of reducing agent to be injected into the denitrification device 8 is controlled by comparing the amounts with a agent amount comparator 22.
上述の手段によれば、複数のディーゼルエンジンのいず
れか一方の排気ダクト３ｂに設けた脱硝装置８近傍のＮ
Ｏｘ計９と、集合排気ダクト５のＮＯｘ計１５により脱
硝装置８への還元剤の注入量を調整するようになってお
り、各ディーゼルエンジン１．２にそれぞれ備えである
ガス量算出器１２．１１に接続のガス量演算器１３を、
前記集合排気ダクト５のＮＯｘ計１５を介した過剰Ｎ。According to the above-mentioned means, the N near the denitrification device 8 provided in the exhaust duct 3b of one of the plurality of diesel engines
The amount of reducing agent injected into the denitrification device 8 is adjusted by the Ox meter 9 and the NOx meter 15 in the collective exhaust duct 5, and each diesel engine 1.2 is equipped with a gas amount calculator 12. The gas amount calculator 13 connected to 11,
Excess N via the NOx meter 15 in the collective exhaust duct 5.
ｘＷｋｎ出器１８に接続することによって、還元剤注入
量補正器２０により補正された還元剤注入量信号と、還
元剤流量発信器２１よりの還元剤流量信号とを還元剤量
比較器２２により比較して、１系統に集約して設けられ
る前記脱硝装置８への還元剤の注入量が制御される。By connecting to the xWkn output device 18, the reducing agent injection amount signal corrected by the reducing agent injection amount corrector 20 and the reducing agent flow rate signal from the reducing agent flow rate transmitter 21 are compared by the reducing agent amount comparator 22. In this way, the amount of reducing agent injected into the denitrification device 8, which is provided in one system, is controlled.
以下、添付図面に基づいてこの発明の詳細な説明する。 Hereinafter, the present invention will be described in detail based on the accompanying drawings.
第１図は、この発明の実施例を示しており、複数台ある
自家発電用のディーゼルエンジン１．２のうち、一方の
ディーゼルエンジンｌと他方のディーゼルエンジン２を
排気ダクト３ａ、３ｂにより消音器４に通じる集合排気
ダクト５に連通させてあり、消音器４に近接する集合排
気ダクト５には、廃熱回収システム６が設けである。FIG. 1 shows an embodiment of the present invention, in which among a plurality of diesel engines 1.2 for private power generation, one diesel engine l and the other diesel engine 2 are silenced by exhaust ducts 3a and 3b. A waste heat recovery system 6 is provided in the collective exhaust duct 5 which is in communication with a collective exhaust duct 5 leading to the silencer 4 and is close to the muffler 4 .
そして、他方のディーゼルエンジン２の排気ダク１−３
ｂには、ガスサンプリング部７を介して１系統に集約し
た脱硝装置８が設けてあり、前記ガスサンプリング部７
には、ＮＯｘ （窒素酸化物）計９を介してＮＯｘ量算
出器１０を設け、このＮ０ｘｉＪ算出器１０は、他方の
ディーゼルエンジン２のガス量算出器１１からのガス量
信号とＮＯＸ計９よりのＮ Ｏｘ 濃度信号とにより、
Ｎ０ｘｌを算出するようになっている。And the exhaust duct 1-3 of the other diesel engine 2
b is provided with a denitrification device 8 that is integrated into one system via a gas sampling section 7.
is provided with a NOx amount calculator 10 via a NOx (nitrogen oxide) meter 9, and this NOxiJ calculator 10 receives the gas amount signal from the gas amount calculator 11 of the other diesel engine 2 and the NOx amount calculator 10 from the NOx meter 9. With the NOx concentration signal,
It is designed to calculate N0xl.
また、一方のディーゼルエンジン１のガス量算出器１２
からのガス量信号と、他方のディーゼルエンジン２のガ
ス量算出器１１よりのガス量信号とを合成し、合計ガス
量を算出するガス量演算器１３が前記各ガス量算出器１
１．１２に接続しである。In addition, the gas amount calculator 12 of one diesel engine 1
A gas amount calculator 13 that combines the gas amount signal from the gas amount calculator 11 of the other diesel engine 2 and the gas amount signal from the gas amount calculator 11 of the other diesel engine 2 to calculate the total gas amount is connected to each gas amount calculator 1.
1.12 is connected.
一方、集合排気ダクト５中に設けられたガスサンプリン
グ部１４は、ＮＯｘ計１５及びＮＯｘ比較器１６に接続
してあり、このＮＯｘ計１５の排出Ｎ Ｏｘ 濃度と設
定排出ＮＯｘ？ＪＴｆ度信号１７をＮＯｘ比較器１６に
より比較して、このＮＯｘ比較器１６により過剰及び温
少Ｎｏｘ？ＪＷ度を算出するようになっている。On the other hand, the gas sampling section 14 provided in the collective exhaust duct 5 is connected to a NOx meter 15 and a NOx comparator 16, and compares the discharge NOx concentration of the NOx meter 15 with the set discharge NOx concentration? The JTf temperature signal 17 is compared by the NOx comparator 16, and the NOx comparator 16 determines whether there is excessive or low temperature Nox? The JW degree is calculated.
さらに前記ＮＯＸ比較器１６の設定値に対する過剰もし
くは過少のＮＯｘｍＯｘｍ色信号ィーゼルエンジン合計
ガス量信号とよりＮ０ｘｌを算出する過剰ＮＯｘ量算出
器１８は、前記ガス量演算器１３と前記ＮＯｘ比較器１
６に接続しである。Furthermore, an excess NOx amount calculator 18 that calculates NOxl from an excessive or insufficient NOxmOxm color signal and a diesel engine total gas amount signal with respect to the set value of the NOx comparator 16 is connected to the gas amount calculator 13 and the NOx comparator 1.
It is connected to 6.
また、過剰ＮＯｘ量算出器１８及び還元剤量算出器（Ｎ
Ｈ３（アンモニア）量算出器〕 １９と、脱硝装置８に
近接して設けたＮＯｘ量算出器１０には、還元剤注入量
補正器（ＮＨ，注入量補正器）２０が連結しである。In addition, an excess NOx amount calculator 18 and a reducing agent amount calculator (N
A reducing agent injection amount corrector (NH, injection amount corrector) 20 is connected to the H3 (ammonia) amount calculator] 19 and the NOx amount calculator 10 provided close to the denitrification device 8.
なお、前記ＮＨ３Ｎ算出器１９は、前記過剰ＮＯｘ量算
出器１８よりのＮＯｘ量信号によりＮＨ・ ３量を算
出するようになっており、また、ＮＨ３注入量補正器２
０はＮＨ，ｌ算出器１９よりのＮＨ１注入量信号と、Ｎ
Ｏｘ量算出器１０よりのＮ０ｘｊｌ信号により、過剰に
Ｎ Ｈｘを脱硝装置８に注入しないよう、ＮＨ３注大量
を補正するようになっている。The NH3N calculator 19 calculates the NH3 amount based on the NOx amount signal from the excess NOx amount calculator 18, and the NH3 injection amount corrector 2.
0 is the NH1 injection amount signal from the NH,l calculator 19 and N
Based on the N0xjl signal from the Ox amount calculator 10, the amount of NH3 injection is corrected so as not to inject excessive NHx into the denitrification device 8.
従って、ＮＨ３注大量補正器２０よりの補正されたＮＨ
Ｉ注入量信号と、ＮＨＩ流量発信器２１よりのＮ Ｈｓ
流量信号とをＮＨ，量比較器２２により比較し、このＮ
Ｈｚ量比較器２２によりコントローラ２３を調整して
、ＮＨ，ｌ流量調整バルブ２４の開度を調整するのであ
る。なお符号２５はＮＨ３（アンモニア）である。Therefore, the corrected NH from the NH3 injection mass corrector 20
I injection amount signal and N Hs from the NHI flow rate transmitter 21
The flow rate signal is compared with the NH, amount comparator 22, and this N
The controller 23 is adjusted by the Hz amount comparator 22 to adjust the opening degree of the NH,1 flow rate adjustment valve 24. Note that the reference numeral 25 is NH3 (ammonia).
この発明は以上のように構成されており、以下にその作
用について説明する。This invention is constructed as described above, and its operation will be explained below.
発電負荷が高く、自家発電用のディーゼルエンジン１．
２とも運転している場合、ディーゼルエンジン１．２そ
れぞれのＮＯｘ濃度をＸ＋ 、Ｘｚｐｐｍ、ガス量をＱ
、、Ｑ２ ＣｒＡ／Ｈとすると、脱硝をしない場合、Ｎ
Ｏｘ排出濃度は、
また、脱硝装置８により脱硝を行った場合、その脱硝率
をα（％）とすると、ディーゼルエンジン２のＮＯｘ排
出濃度は、
ゼルエンジンｌ及び２合計のＮＯｘ排出濃度は、度の低
減となる。Diesel engine for private power generation with high power generation load 1.
If both 2 are running, the NOx concentration of diesel engine 1.2 is X+, Xzppm, and the gas amount is Q.
,, Q2 CrA/H, if no denitration is performed, N
The Ox emission concentration is: When denitration is performed by the denitrification device 8, and the denitration rate is α (%), the NOx emission concentration of the diesel engine 2 is: The NOx emission concentration of the diesel engine 1 and 2 in total is: This results in a reduction in
これにより、ＮＯｘ低減を図り、かつ脱硝装置８の数を
低減することによって、イニシャルコスト及びランニン
グコストの低減が可能となる。This makes it possible to reduce initial costs and running costs by reducing NOx and reducing the number of denitrification devices 8.
ところで、ＮＨ３注入量のコントロールは以下のように
行う。By the way, the amount of NH3 to be injected is controlled as follows.
集合排気ダクト５中のガスサンプリング部１４よりガス
をサンプリングし、ＮＯｘ計１５にてＮｏｘｆｌＪ度を
計測する。このＮＯｘ濃度と設定排出ＮＯｘ濃度信号１
７により、設定信号に対して過剰及び過少のＮ０ｘｉ４
度をＮＯｘ比較器１６にて算出する。Gas is sampled from the gas sampling section 14 in the collective exhaust duct 5, and the NOxflJ degree is measured using the NOx meter 15. This NOx concentration and the set discharge NOx concentration signal 1
7, the excessive and insufficient N0xi4 with respect to the setting signal
The NOx comparator 16 calculates the NOx degree.
ディーゼルエンジンＩ及び２に設けられたガス量算出器
１２及び工１によりそれぞれの排ガス量を算出する。こ
のガス量信号よりガス量演算器１３にて合計のガス量を
算出する。この合計のガス量信号と前記設定排出Ｎ Ｏ
ｘ ？４度信号１７よりのＮ Ｏｘ ｔｆ４度信号とに
より、過剰もしくは過少のＮＯｘ量を過剰Ｎｏｘｉ算出
器１８により算出する。The exhaust gas amount of each diesel engine I and 2 is calculated by the gas amount calculator 12 and engine 1 provided in the diesel engines I and 2. A gas amount calculator 13 calculates the total gas amount from this gas amount signal. This total gas amount signal and the set discharge NO
x? Based on the NOx tf4 degree signal from the 4 degree signal 17, an excessive or insufficient amount of NOx is calculated by an excess Noxi calculator 18.
ＮＯｘとＮＨ３の反応モル比は、１：ｌ〜１：０８より
設定したモル比に対するＮＨ，ｌを、ＮＨ３量算出器１
９により算出する。The reaction molar ratio of NOx and NH3 is determined by calculating NH,l for the molar ratio set from 1:l to 1:08 using the NH3 amount calculator 1.
Calculated using 9.
なお、エンジン排ガス中の酸素濃度は、エンジンの負荷
に関係なくほぼ一定であることにより、エンジンの燃料
流量信号をもらい、燃料１１ｇ燃焼した時の排ガスｉＫ
を乗じて、排ガス流量とすることもできる。In addition, since the oxygen concentration in engine exhaust gas is almost constant regardless of the engine load, the exhaust gas iK when 11 g of fuel is burned is determined by receiving the engine fuel flow signal.
It is also possible to obtain the exhaust gas flow rate by multiplying by
また、脱硝装置８のガスサンプリング部７に接続されて
いるＮＯｘ計９及びガス量算出器１１よりの信号により
、脱硝前のＮ Ｏｘ ’ｔＭ度をＮＯｘ量算出器１０に
より算出する。この脱硝前のＮＯｘ量信号と、ＮＨ，量
算出器１９よりのＮＨ，注入量信号とより、注入ＮＨｆ
ｆがＮ Ｏｘ ／ Ｎ Ｈ，モル比１．０を超えないよ
うにＮＨ３注大量補正器２０において補正する。Further, the NOx 'tM degree before denitration is calculated by the NOx amount calculator 10 based on the signals from the NOx meter 9 and the gas amount calculator 11 connected to the gas sampling section 7 of the denitrification device 8. From this NOx amount signal before denitrification and the NH, injection amount signal from the NH, amount calculator 19, the injected NHf
The NH3 injection large amount corrector 20 corrects so that f does not exceed the NOx/NH molar ratio of 1.0.
その理由は、ＮＨｌをモル比１．０以上注入しても、脱
硝率の増加は認められないにもかかわらず、残留ＮＨ＊
ｈｔが増加するためである。The reason for this is that although no increase in the denitrification rate is observed even when NHL is injected at a molar ratio of 1.0 or more, residual NH*
This is because ht increases.
前記ＮＨ，注入量補正器２０よりのＮＨ，量信号及びＮ
Ｈ３流量発信器２１の信号により、ＮＨ３注大量をコン
トローラ２３及びＮＨ３流量調整バルブ２４により制御
するのである。The NH, the amount signal from the injection amount corrector 20, and the N
Based on the signal from the H3 flow rate transmitter 21, the amount of NH3 injection is controlled by the controller 23 and the NH3 flow rate adjustment valve 24.
この発明は上述のように、複数のディーゼルエンジンの
いずれか一方の排気ダクトに脱硝装置を設け、集合排気
ダクトに設置したＮＯｘ計とガス量演算器を過剰ＮＯｘ
量算出器及び還元剤補正器に接続して、還元剤注入量補
正器と還元剤流量発信器からの各信号を還元剤量比較器
により比較し、１系統に集約した脱硝装置への還元剤の
注入量を制御するようにしたため、
（イ）自家発電用のディーゼルエンジンが複数設備され
る場合、従来、各エンジン毎に設置していた脱硝装置を
１系統に集約することにより、脱硝装置及び制御装置の
イニシャルコスト（設備費）が低減できる。As described above, this invention provides a denitrification device in one of the exhaust ducts of a plurality of diesel engines, and detects excess NOx by installing a NOx meter and a gas amount calculator installed in the collective exhaust duct.
Connected to the amount calculator and reducing agent corrector, each signal from the reducing agent injection amount corrector and reducing agent flow rate transmitter is compared by the reducing agent amount comparator, and the reducing agent to the denitration equipment is integrated into one system. (a) When multiple diesel engines are installed for in-house power generation, the denitrification equipment, which was previously installed for each engine, can be integrated into one system, making it possible to reduce the amount of denitrification equipment and The initial cost (equipment cost) of the control device can be reduced.
（ロ）脱硝装置及びその設置スペースを低減することが
できる。(b) The denitrification equipment and its installation space can be reduced.
（ハ）ＮＯｘ計測装置の低減が図られる。(c) The number of NOx measuring devices can be reduced.
（ニ）ＮＨ３消費量が低減できる。(d) NH3 consumption can be reduced.
（ホ）触媒使用量の低減が図られる。(e) The amount of catalyst used will be reduced.
（へ）ガス温度を低減させず、ＮＯｘ計１５．度が低減
できることにより、ディーゼルエンジンの運転時間制限
がなく、効率的に廃熱回収システムを有効に活用して運
転できるという効果がある。(f) NOx meter without reducing gas temperature 15. By being able to reduce the temperature, there is no restriction on the operating time of the diesel engine, and there is an effect that the diesel engine can be operated efficiently and effectively utilizing the waste heat recovery system.
第１図は、この発明の実施例を示す構成図、第２図から
第４図までの図面は、それぞれの従来例を示しており、
第２図は１つの従来例を示す図面、
第３図は他の従来例を示す図面、
第４図はさらに他の従来例を示す図面である。
１２・−・・・・−ディーゼルエンジン３ａ、３ｂ・−
・−・−排気ダクト
４−−−−−一消音器
５−・・・−・・集合排気ダクト
８−・−・−脱硝装置
１１．１２−−−−・ガス量算出器
１３・−・・・−ガス量演算器
１５−−−・−ＮＯｘ計
１８−・−過剰ＮＯｘ量算出器
１９−−−−−・−還元剤量算出器
２ （Ｌ−−−−一還元剤注入量補正器２１−−−−一
還元剤流量発信器
２２−・・−還元剤量比較器
出願人 ）−ヨタ自動車株式会社FIG. 1 is a block diagram showing an embodiment of the present invention, and the drawings from FIG. 2 to FIG. 4 show respective conventional examples.
FIG. 2 is a drawing showing one conventional example, FIG. 3 is a drawing showing another conventional example, and FIG. 4 is a drawing showing still another conventional example. 12.--Diesel engine 3a, 3b.-
・−・−Exhaust duct 4−−−−−One silencer 5−・−・・Collective exhaust duct 8−・−・−Denitrification device 11.12−−−−・Gas amount calculator 13・−・...-Gas amount calculator 15----NOx meter 18---Excess NOx amount calculator 19--Reducing agent amount calculator 2 (L---Reducing agent injection amount correction Device 21 - Reducing agent flow rate transmitter 22 - Reducing agent amount comparator Applicant ) - Yota Motors Co., Ltd.
Claims (1)
る排ガスを脱硝装置により脱硝する発電ディーゼルエン
ジン排ガスのＮＯ＿ｘ低減装置において、複数のディー
ゼルエンジンを排気ダクトにより消音器に通じる集合排
気ダクトに連通させ、複数のディーゼルエンジンのいず
れか一方の排気ダクトに脱硝装置を設けて、各ディーゼ
ルエンジンにそれぞれ備えたガス量算出器をガス量演算
器に接続し、しかも、前記集合排気ダクトに設置したＮ
Ｏ＿ｘ計と前記ガス量演算器を過剰ＮＯ＿ｘ量算出器に
接続するとともに、この過剰ＮＯ＿ｘ量算出器及び還元
剤量算出器と脱硝装置に近接して設けたＮＯ＿ｘ量算出
器に還元剤注入量補正器を連結し、この還元剤注入量補
正器により補正された還元剤注入量信号と、還元剤流量
発信器よりの還元剤流量信号とを還元剤量比較器により
比較して、脱硝装置への還元剤の注入量を制御すること
を特徴とする発電ディーゼルエンジン排ガスのＮＯ＿ｘ
低減装置。(1) In a power generation diesel engine exhaust gas NO_x reduction device that denitrates exhaust gas emitted from a plurality of power generation diesel engines using a denitrification device, the plurality of diesel engines are connected to a collective exhaust duct leading to a silencer by an exhaust duct, A denitrification device is provided in the exhaust duct of one of the plurality of diesel engines, and a gas amount calculator provided in each diesel engine is connected to the gas amount calculator, and the nitrogen removal device installed in the collective exhaust duct is connected to the gas amount calculator.
The O_x meter and the gas amount calculator are connected to the excess NO_x amount calculator, and the reducing agent injection amount is corrected to the excess NO_x amount calculator, the reducing agent amount calculator, and the NO_x amount calculator provided close to the denitrification device. The reducing agent injection amount signal corrected by the reducing agent injection amount corrector and the reducing agent flow rate signal from the reducing agent flow rate transmitter are compared by the reducing agent amount comparator, and the signal is sent to the denitrification device. NO_x of power generation diesel engine exhaust gas characterized by controlling the injection amount of reducing agent
Reduction device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62327624A JPH07114921B2 (en) | 1987-12-24 | 1987-12-24 | NOx reduction device for exhaust gas from power generation diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62327624A JPH07114921B2 (en) | 1987-12-24 | 1987-12-24 | NOx reduction device for exhaust gas from power generation diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01168319A true JPH01168319A (en) | 1989-07-03 |
| JPH07114921B2 JPH07114921B2 (en) | 1995-12-13 |
Family
ID=18201128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62327624A Expired - Fee Related JPH07114921B2 (en) | 1987-12-24 | 1987-12-24 | NOx reduction device for exhaust gas from power generation diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07114921B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007255303A (en) * | 2006-03-23 | 2007-10-04 | Mitsubishi Fuso Truck & Bus Corp | CONTROL APPARATUS OF ENGINE WITH SELECTIVE REDUCTION TYPE NOx CATALYST |
| JP2010203266A (en) * | 2009-03-02 | 2010-09-16 | Samson Co Ltd | Nox removal device |
| JP2014098340A (en) * | 2012-11-14 | 2014-05-29 | Daihatsu Diesel Mfg Co Ltd | Exhaust emission control system |
| JP2018099648A (en) * | 2016-12-20 | 2018-06-28 | 三菱重工業株式会社 | Exhaust gas treatment apparatus and exhaust gas treatment method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6150619A (en) * | 1984-08-17 | 1986-03-12 | Toshiba Corp | Denitration control apparatus of composite cycle power plant |
-
1987
- 1987-12-24 JP JP62327624A patent/JPH07114921B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6150619A (en) * | 1984-08-17 | 1986-03-12 | Toshiba Corp | Denitration control apparatus of composite cycle power plant |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007255303A (en) * | 2006-03-23 | 2007-10-04 | Mitsubishi Fuso Truck & Bus Corp | CONTROL APPARATUS OF ENGINE WITH SELECTIVE REDUCTION TYPE NOx CATALYST |
| JP4637775B2 (en) * | 2006-03-23 | 2011-02-23 | 三菱ふそうトラック・バス株式会社 | Control device for engine with selective reduction type NOx catalyst |
| JP2010203266A (en) * | 2009-03-02 | 2010-09-16 | Samson Co Ltd | Nox removal device |
| JP2014098340A (en) * | 2012-11-14 | 2014-05-29 | Daihatsu Diesel Mfg Co Ltd | Exhaust emission control system |
| JP2018099648A (en) * | 2016-12-20 | 2018-06-28 | 三菱重工業株式会社 | Exhaust gas treatment apparatus and exhaust gas treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07114921B2 (en) | 1995-12-13 |
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