WO2017193671A1 - Procédé de traitement de monoxyde d'azote dans un gaz d'échappement - Google Patents

Procédé de traitement de monoxyde d'azote dans un gaz d'échappement Download PDF

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Publication number
WO2017193671A1
WO2017193671A1 PCT/CN2017/074902 CN2017074902W WO2017193671A1 WO 2017193671 A1 WO2017193671 A1 WO 2017193671A1 CN 2017074902 W CN2017074902 W CN 2017074902W WO 2017193671 A1 WO2017193671 A1 WO 2017193671A1
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Prior art keywords
exhaust gas
nitric oxide
exhaust
pressure value
treating
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PCT/CN2017/074902
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English (en)
Chinese (zh)
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崔翠翠
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • 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
    • F01N3/18—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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F01N2570/145—Dinitrogen oxide
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to the technical field of automobiles, and in particular to a method for treating nitrogen monoxide in exhaust gas.
  • the emission of automobile exhaust is a matter of great concern to the society.
  • the exhaust gas emitted by automobiles contains various harmful gases including carbon monoxide (CO) and nitrogen monoxide (NO). These gases cause environmental pollution on the one hand, and on the other hand It can cause personal injury.
  • CO carbon monoxide
  • NO nitrogen monoxide
  • nitric oxide in automobile exhaust is a colorless, odorless, water-soluble toxic gas. Because nitric oxide carries free radicals, it makes its chemical properties very active, once it is discharged into the air as automobile exhaust. After reacting with oxygen, a corrosive gas, nitrogen dioxide, is formed. Inhalation of nitrogen dioxide in the early stage will have mild eye and upper respiratory tract irritation, such as pharyngeal discomfort, dry cough, etc., and after a few hours of incubation, chest tightness, respiratory distress, cough, sputum, cyanosis, etc. It may even make people faint.
  • the present invention aims to provide a method and system for treating nitrogen monoxide in exhaust gas, which can effectively treat nitric oxide in automobile exhaust gas in time, and reduce environmental pollution and personal exhaust of exhaust gas. hurt.
  • the present invention adopts the following technical solutions:
  • a method for treating nitric oxide in exhaust gas comprising the steps of:
  • the vehicle exhaust gas is monitored in real time by means of infrared detection, and a corresponding electrical signal is generated according to the wavelength range of the absorbed infrared light and the degree of absorption;
  • the process of discharging exhaust gas into a photocatalytic reactor for nitric oxide treatment comprises:
  • V NO is the reference speed
  • r is the rotational speed of the automobile engine
  • C is the concentration of nitrogen monoxide
  • T is the current temperature in the photocatalytic reactor
  • P is the outlet of the exhaust pipe of the automobile engine obtained in step S101.
  • the exhaust pressure value, a is a constant conversion coefficient, and a ranges from 0.25 to 0.4.
  • the method and system for treating nitrogen monoxide in exhaust gas of the present invention monitors the type of harmful gas contained in the exhaust gas of the automobile by monitoring the exhaust pressure value at the outlet of the exhaust pipe of the automobile engine. Detection, and identification of various harmful gases, according to the identification to determine whether the harmful gases contain nitric oxide, if it is, the nitrogen monoxide is discharged into the photocatalytic reactor for treatment, achieving targeted treatment of harmful gases Nitric oxide can effectively improve the efficiency of tail gas treatment, avoiding pollution caused by automobile exhaust and causing personal injury.
  • FIG. 1 is a schematic flow chart of a method for treating nitrogen monoxide in exhaust gas according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a system for treating nitric oxide in exhaust gas in an embodiment of the present invention.
  • a method for treating nitric oxide in exhaust gas includes the following steps:
  • step S101 the exhaust pressure value at the outlet of the exhaust pipe of the automobile engine is obtained. Since the car produces different power on different roads or when the speed of the car is different, the exhaust pressure at the outlet of the exhaust pipe of the automobile engine is also different. When the exhaust pressure value is different, the content of harmful gases contained in the exhaust gas at the outlet of the exhaust pipe of the engine is also different.
  • Step S102 when the exhaust pressure value reaches a predetermined value, the vehicle exhaust gas is monitored in real time by means of infrared detection, and a corresponding electrical signal is generated according to the wavelength range of the absorbed infrared light and the degree of absorption.
  • the automobile exhaust gas at the outlet of the automobile exhaust gas purifier is detected, which can effectively reduce the number of times and time of using the equipment used in the process, and prolong the use of the device. life.
  • Step S103 sequentially filtering and amplifying the electrical signal, acquiring the type of the harmful gas in the amplified electrical signal, and identifying each harmful gas according to the type of the harmful gas, and the identification is convenient for different harmful Gas is distinguished.
  • automobile exhaust gas usually contains various harmful gases such as nitrogen oxides, hydrocarbons, sulfur oxides, and nitrogen oxides.
  • Each of these gases has a specific characteristic absorption band and characteristic frequency that is strongly absorbed when the infrared spectrum falls near the characteristic frequency band. Therefore, the infrared spectrum of the corresponding characteristic frequency can be used to detect the components of the harmful gas in the exhaust gas, and the amount of the absorbed external spectrum can detect the content of the corresponding gas.
  • the filter circuit and the amplification may be respectively adopted.
  • the circuit filters and amplifies the electrical signal. After filtering and amplifying the electrical signal, the accuracy of the electrical signal detection can be effectively improved.
  • Step S104 determining whether the harmful gas in the exhaust gas contains nitric oxide according to the identifier. If the exhaust gas contains nitric oxide, step S105 can be performed.
  • Step S105 if the result of the determination in step S104 is YES, that is, if it is determined according to the identifier that the harmful gas in each exhaust gas contains nitric oxide, a catalytic reaction command is generated, and the exhaust gas is discharged to the photocatalytic reaction through the catalytic reaction command. Nitric oxide treatment is carried out in the apparatus.
  • the exhaust gas can be absorbed by the exhaust gas having a photocatalytic reaction layer of titanium dioxide and ultraviolet rays by ultraviolet light. Since this embodiment is for secondary treatment of automobile exhaust gas, usually in automobile exhaust gas. The content of harmful substances is usually low, so that nitrogen monoxide can be completely absorbed by the photocatalytic reaction.
  • step S104 if it is determined in step S104 that the harmful gas exceeding the limit emission in each exhaust gas further contains carbon monoxide, an absorption command may be generated, and after the nitric oxide is processed, the exhaust gas is exhausted by the absorption command.
  • the carbon monoxide treatment is carried out in a vessel having a carbon monoxide absorbent.
  • the carbon monoxide absorbent may be a composition composed of a porous inorganic carrier and a binary complex of a nitride and copper chloride carried thereon, and nitrogen in the composition
  • the compound may comprise from 0.4 to 0.8 molar ratio.
  • the inorganic carrier may be: porous ceramic, activated carbon or titanium oxide.
  • the nitride can be: pyridine and Composition and the like. The carbon monoxide absorbent can effectively absorb carbon monoxide in the exhaust gas.
  • the electrical signal can be filtered by using a Fourier transform to remove low frequency electrical signals, thereby effectively improving the accuracy of electrical signal detection.
  • the process of discharging the exhaust gas into the photocatalytic reactor for performing the nitric oxide treatment may specifically include:
  • the infrared detecting method is used to calculate the concentration of the nitric oxide
  • the current temperature can be obtained by placing a temperature sensor in the photocatalytic reactor;
  • a reference speed is calculated based on the rotational speed, the current temperature, the concentration, and the exhaust pressure value, and the speed at which the exhaust gas is discharged into the photocatalytic reactor is adjusted according to the reference speed.
  • V NO is the reference speed
  • r is the rotational speed of the automobile engine
  • C is the concentration of nitrogen monoxide
  • T is the current temperature in the photocatalytic reactor
  • P is the outlet of the exhaust pipe of the automobile engine obtained in step S101.
  • the value of the exhaust pressure, a is a constant conversion factor, between 0.25-0.4.
  • the present invention also provides a system for treating nitric oxide in exhaust gas, comprising:
  • the exhaust pressure value obtaining module 101 is configured to obtain an exhaust pressure value at an outlet of the exhaust pipe of the automobile engine
  • the detecting module 102 is configured to perform real-time monitoring of the vehicle exhaust gas by means of infrared detection when the exhaust gas pressure value reaches a predetermined value, and generate a corresponding electrical signal according to the wavelength range of the absorbed infrared light and the degree of absorption. ;
  • the identification module 103 is configured to sequentially filter and amplify the electrical signal, acquire the type of the harmful gas in the amplified electrical signal, and identify each harmful gas according to the type of the harmful gas;
  • the determining module 104 is configured to determine, according to the identifier, whether the harmful gas in the exhaust gas contains nitric oxide;
  • the nitric oxide treatment module 105 is configured to generate a catalytic reaction command when the determination result of the determination module 104 is YES, and discharge the exhaust gas into the photocatalytic reactor through the catalytic reaction instruction to perform nitric oxide treatment.
  • a system for treating nitric oxide in exhaust gas of the present invention may further comprise:
  • a carbon monoxide treatment module configured to generate an absorption command if the harmful gas exceeding the limit emission in each exhaust gas further contains carbon monoxide according to the mark, and discharge the exhaust gas to have carbon monoxide through the absorption command after the nitric oxide is processed
  • the carbon monoxide treatment is carried out in a container of the absorbent.
  • the nitric oxide treatment module may include:
  • a concentration calculation module configured to obtain infrared light intensity obtained by passing infrared rays through the exhaust gas, and calculate a concentration of nitrogen monoxide in the exhaust gas according to the infrared light intensity
  • a parameter acquisition module for acquiring the rotational speed of the automobile engine and the current temperature in the photocatalytic reactor in real time
  • a speed control module configured to calculate a reference speed based on the rotational speed, current temperature, concentration, and the exhaust pressure value, and adjust a velocity of exhaust gas emission into the photocatalytic reactor according to the reference speed.
  • the method and system for treating nitrogen monoxide in the exhaust gas of the present invention detects the type of harmful gas contained in the exhaust gas of the automobile by monitoring the exhaust pressure value at the outlet of the exhaust pipe of the automobile engine, and Various harmful gases are identified, and whether the harmful gas contains nitric oxide is determined according to the label, and if so, the nitrogen monoxide is discharged into the photocatalytic reactor for treatment, and the targeted treatment of nitric oxide in the harmful gas is realized. It can effectively improve the efficiency of exhaust gas treatment, avoiding pollution caused by automobile exhaust and causing harm to the human body.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Catalysts (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un procédé de traitement de monoxyde d'azote dans un gaz d'échappement, ledit procédé comprenant les étapes suivantes : l'obtention d'une valeur de pression d'échappement au niveau d'une sortie de tuyau d'échappement de moteur de véhicule automobile (S101) ; lorsque la valeur de la pression d'échappement atteint une valeur prédéfinie, le contrôle du gaz d'échappement du véhicule automobile en temps réel par le biais de moyens de détection infrarouge et la génération d'un signal électrique correspondant selon une plage de longueur d'onde infrarouge absorbée et un degré d'absorption (S102) ; la réalisation séquentielle d'un traitement de filtrage et d'amplification sur le signal électrique, l'obtention des types de gaz nocifs dans le signal électrique après le traitement d'amplification et l'identification des divers gaz nocifs en fonction des types de gaz nocifs (S103) ; en fonction de l'identification, la détermination si les gaz nocifs présents dans le gaz d'échappement comprennent du monoxyde d'azote (S104) ; si oui, la génération d'une instruction de réaction catalytique, et par l'intermédiaire de l'instruction de réaction catalytique, l'évacuation du gaz d'échappement vers un réacteur photocatalytique pour un traitement de monoxyde d'azote (S105). Le procédé de traitement de monoxyde d'azote dans des gaz d'échappement traite efficacement le monoxyde d'azote dans un gaz d'échappement d'un véhicule automobile en temps opportun et réduit la pollution de l'environnement et les dommages corporels.
PCT/CN2017/074902 2016-05-09 2017-02-26 Procédé de traitement de monoxyde d'azote dans un gaz d'échappement Ceased WO2017193671A1 (fr)

Applications Claiming Priority (2)

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CN201610301153.9 2016-05-09
CN201610301153.9A CN105927339A (zh) 2016-05-09 2016-05-09 处理尾气中一氧化氮的方法及系统

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105822391A (zh) * 2016-05-09 2016-08-03 饶川辉 汽车尾气中的二氧化氮处理方法及系统
CN105781693A (zh) * 2016-05-09 2016-07-20 饶川辉 汽车尾气中的一氧化氮处理方法及系统
CN105927339A (zh) * 2016-05-09 2016-09-07 饶川辉 处理尾气中一氧化氮的方法及系统
CN114345093B (zh) * 2022-01-24 2022-10-11 广州科威环保工程有限公司 一种除臭效果好的泵站等离子除臭装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1185351A (zh) * 1996-02-29 1998-06-24 三菱瓦斯化学株式会社 新型一氧化碳吸附剂及方法
JP2002048711A (ja) * 2000-08-03 2002-02-15 Mitsubishi Heavy Ind Ltd レーザー計測装置
CN101346619A (zh) * 2005-12-28 2009-01-14 丰田自动车株式会社 废气分析器及废气分析方法
CN102434253A (zh) * 2011-09-29 2012-05-02 华北电力大学 一种汽车尾气三级处理装置及其分离方法
CN104863669A (zh) * 2015-06-04 2015-08-26 盐城工学院 汽车新型尾气过滤处理装置
CN105781693A (zh) * 2016-05-09 2016-07-20 饶川辉 汽车尾气中的一氧化氮处理方法及系统
CN105927339A (zh) * 2016-05-09 2016-09-07 饶川辉 处理尾气中一氧化氮的方法及系统

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1185351A (zh) * 1996-02-29 1998-06-24 三菱瓦斯化学株式会社 新型一氧化碳吸附剂及方法
JP2002048711A (ja) * 2000-08-03 2002-02-15 Mitsubishi Heavy Ind Ltd レーザー計測装置
CN101346619A (zh) * 2005-12-28 2009-01-14 丰田自动车株式会社 废气分析器及废气分析方法
CN102434253A (zh) * 2011-09-29 2012-05-02 华北电力大学 一种汽车尾气三级处理装置及其分离方法
CN104863669A (zh) * 2015-06-04 2015-08-26 盐城工学院 汽车新型尾气过滤处理装置
CN105781693A (zh) * 2016-05-09 2016-07-20 饶川辉 汽车尾气中的一氧化氮处理方法及系统
CN105927339A (zh) * 2016-05-09 2016-09-07 饶川辉 处理尾气中一氧化氮的方法及系统

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