CN105822390A - Automobile Exhaust Gas Treatment Method and System - Google Patents

Abstract

The invention relates to an automobile exhaust treatment method and system, wherein the method comprises the following steps: monitoring tail gas at the outlet of the automobile tail gas purifier in real time, and analyzing the tail gas to obtain the types and contents of various harmful gases in the tail gas; identifying each harmful gas according to the type of the harmful gas; judging whether the tail gas is the tail gas which is discharged in an overrun way or not according to the content of various harmful gases; if so, judging whether the harmful gas which is over-limit discharged in the tail gas only contains nitric oxide or not according to the identification; and if the harmful gas which is over-limit discharged in the tail gas only contains nitric oxide according to the identification, generating a catalytic reaction instruction, and discharging the tail gas into a photocatalytic reactor for treatment through the catalytic reaction instruction. The invention can effectively and timely treat the automobile exhaust which is over-limit discharged, and reduces the environmental pollution and the personal injury.

Description

Automobile Exhaust Gas Treatment Method and System

technical field

The invention relates to the technical field of automobiles, in particular to an automobile exhaust gas treatment method and an automobile exhaust gas treatment system.

Background technique

The emission of automobile exhaust is a matter of great concern to the society. The exhaust 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 also Can cause personal injury.

For example, nitric oxide in automobile exhaust is a colorless, odorless, poisonous gas that is insoluble in water. Since nitric oxide contains free radicals, its chemical properties are very active. Once it is discharged into the air as automobile exhaust After reacting with oxygen, a corrosive gas, nitrogen dioxide, is formed. In the early stage of inhaling nitrogen dioxide gas, there will be mild eye and upper respiratory tract irritation symptoms, such as throat discomfort, dry cough, etc., and after a few hours of incubation, chest tightness, respiratory distress, cough, foamy sputum, cyanosis, etc. will occur. Or it may even cause fainting.

Therefore, it becomes an urgent problem to be solved how to further process the exhaust gas of vehicles with excessive emissions to reduce the degree of environmental pollution and personal injury caused by the harmful gases in the exhaust gas.

Contents of the invention

Aiming at the deficiencies of the prior art, the object of the present invention is to provide a method and system for treating automobile exhaust gas, which can effectively and timely treat the nitric oxide in the exhaust gas discharged beyond the limit, and reduce the environmental pollution and personal injury caused by the exhaust gas. .

To achieve the above object, the present invention adopts the following technical solutions:

A method for treating automobile exhaust gas, comprising the steps of:

Real-time monitoring of the exhaust gas at the outlet of the automobile exhaust purifier, and analysis of the exhaust gas to obtain the types and contents of various harmful gases in the exhaust gas;

Label each harmful gas according to the type of harmful gas;

According to the content of various harmful gases, it can be judged whether the exhaust gas is exhausted beyond the limit;

If so, judge whether the harmful gas discharged beyond the limit in the tail gas only contains nitric oxide according to the mark;

If it is judged according to the mark that the harmful gas discharged beyond the limit in the tail gas only contains nitric oxide, a catalytic reaction command is generated, and the tail gas is discharged into the photocatalytic reactor for processing through the catalytic reaction command.

The present invention also provides an automobile exhaust treatment system, comprising:

The detection module is used to monitor the exhaust gas at the outlet of the automobile exhaust purifier in real time, and analyze the exhaust gas to obtain the types and contents of various harmful gases in the exhaust gas;

The identification module is used to identify each harmful gas according to the type of harmful gas;

The first judging module is used to judge whether the tail gas is the tail gas discharged beyond the limit according to the content of various harmful gases;

The second judging module is used to judge whether the harmful gas discharged beyond the limit in the tail gas only contains nitric oxide according to the mark when the judging result of the first judging module is yes;

The nitric oxide processing module is configured to generate a catalytic reaction instruction when the judgment result of the second judging module is yes, and discharge the tail gas into the photocatalytic reactor for nitric oxide treatment through the catalytic reaction instruction.

Compared with the prior art, a method and system for treating automobile exhaust of the present invention detects the types and contents of harmful gases contained in automobile exhaust, and marks various harmful gases. Harmful gases that exceed the standard are treated separately, focusing on nitric oxide to achieve targeted treatment of harmful gases, which can effectively improve the efficiency of exhaust gas treatment and avoid environmental pollution and personal injury caused by vehicle exhaust.

Description of drawings

Fig. 1 is the schematic flow sheet of a kind of automobile tail gas treatment method in the embodiment of the present invention;

Fig. 2 is a schematic diagram of an automobile exhaust treatment system in an embodiment of the present invention.

detailed description

Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:

After the automobile exhaust gas passes through the purifier, the harmful gas contained in it will usually be in a standard state, but in the case of engine failure or purifier failure, excessive exhaust gas may appear. The present invention is mainly aimed at the secondary treatment of exhaust gas . As shown in Figure 1, a kind of automobile tail gas processing method described in the present embodiment comprises the following steps:

In step S101, the exhaust gas at the outlet of the automobile exhaust gas purifier is monitored in real time, and the exhaust gas is analyzed to obtain the types and contents of various harmful gases in the exhaust gas. Multiple gas detectors can be used to detect the tail gas in this step. Each gas detector can detect the type and content of harmful gases contained in the exhaust gas respectively. The gas detector includes at least one detector for detecting the nitric oxide content in the tail gas.

In step S102, each harmful gas is marked according to the type of the harmful gas. Harmful gases can be identified according to the results detected by different gas detectors.

Step S103 , judging whether the tail gas is exhausted beyond the limit according to the contents of various harmful gases. If yes, it means that there is at least one harmful gas in the exhaust gas that exceeds the national standard. At this time, step S104 is executed to realize the processing of the exhaust gas discharged beyond the limit according to the label. Otherwise, it means that there is no harmful gas in the exhaust gas of the vehicle or even so little that it can be ignored. At this time, return to step S101 to continue monitoring.

Step S104, if yes, judge whether the harmful gas discharged beyond the limit in the tail gas only contains nitric oxide according to the identification. If yes, it means that except for the high content of nitric oxide in the exhaust gas, other harmful gases are within the standard range, and step S105 can be executed at this time.

Step S105, if the judgment result of step S104 is yes, that is, according to the identification, it is judged that the harmful gas discharged beyond the limit in the tail gas only contains nitric oxide, then a catalytic reaction command is generated, and the tail gas is discharged to the photocatalytic reaction through the catalytic reaction command processed in the processor.

Specifically, in this embodiment, the exhaust gas can be absorbed by the method of having a titanium dioxide photocatalytic reaction layer and emitting ultraviolet rays by an ultraviolet lamp. Since this embodiment is for the secondary treatment of automobile exhaust, usually the The content of harmful substances is usually low, so the nitric oxide can be completely absorbed after the photocatalytic reaction.

As a preferred embodiment, the process of real-time monitoring the tail gas at the outlet of the automobile exhaust purifier, and analyzing the tail gas to obtain the types and contents of various harmful gases in the tail gas may include the following steps:

Real-time monitoring of exhaust gas by means of infrared detection;

According to the wavelength range and the degree of absorption of the absorbed infrared rays, corresponding electrical signals are generated;

According to the electrical signal analysis, the type and content of the harmful gas can be obtained.

Because automobile exhaust usually contains various harmful gases such as nitric oxide, hydrocarbons, sulfur oxides, and nitrogen oxides. Each of these gases has a specific characteristic absorption band and characteristic frequency, and when the infrared spectrum falls near the characteristic frequency band, it will be strongly absorbed. Therefore, the composition of harmful gases in the exhaust gas can be detected through the infrared spectrum of the corresponding characteristic frequency, and the amount of the absorbed outer spectrum can detect the content of the corresponding gas.

As a preferred embodiment, before the step of analyzing and obtaining the type and content of the harmful gas according to the electrical signal, the following steps may also be included: sequentially filtering and amplifying the electrical signal. Specifically, the electric signal can be filtered and amplified through a filter circuit and an amplifying circuit respectively. After the electric signal is filtered and amplified, the accuracy of electric signal detection can be effectively improved.

In one embodiment, if in step S105, it is judged according to the identification that the harmful gas emitted beyond the limit in the tail gas also contains carbon monoxide, an absorption instruction can be generated, and after the nitric oxide is processed, the exhaust gas can be discharged through the absorption instruction To a container with a carbon monoxide absorbent for carbon monoxide treatment.

As a preferred embodiment, the carbon monoxide absorbent can be a composition composed of a porous inorganic carrier and a binary complex of nitride and copper chloride carried on it, and nitrogen in the composition Compounds can account for 0.4-0.8 molar ratio. In addition, the inorganic carrier can be: porous ceramics, activated carbon or titanium oxide, etc. The nitride can be: pyridine and composition etc. The carbon monoxide absorbent can effectively absorb carbon monoxide in tail gas.

In addition, as a better embodiment, the process of discharging the tail gas into the photocatalytic reactor for nitric oxide treatment may specifically include:

Obtain the infrared light intensity obtained after the infrared rays pass through the exhaust gas, and calculate the concentration of nitric oxide in the exhaust gas according to the infrared light intensity; in the embodiment of the present invention, the infrared detection method is used to calculate the concentration of nitric oxide;

Obtain the speed of the automobile engine and the current temperature in the photocatalytic reactor in real time; the current temperature can be obtained by placing a temperature sensor in the photocatalytic reactor;

A reference speed is calculated according to the rotation speed, current temperature and concentration, and the speed at which the tail gas is discharged into the photocatalytic reactor is adjusted according to the reference speed.

In this embodiment, the following formula can be used to calculate the reference speed:

${\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; *</span>\frac{\mathrm{<span\; class="notranslate">\; C</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; *</span>\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; ;</span>$

In the above formula, V _NO is the reference speed; r is the speed of the car engine, C is the concentration of nitric oxide, T is the current temperature in the photocatalytic reactor, and a is a constant conversion coefficient between 0.1 and 0.3. By controlling the speed at which exhaust gas is discharged into the photocatalytic reactor, nitric oxide can be more completely absorbed in the photocatalytic reactor, thereby effectively improving the efficiency of nitric oxide treatment. In particular, a large amount of experimental data proves that when the value of a is 0.25, the efficiency of nitric oxide treatment is the best.

As a preferred embodiment, after the tail gas is processed according to the identification, the following steps may also be included:

Collect the treated automobile exhaust gas and pressurize it to separate the carbon dioxide and nitrogen in the exhaust gas;

The separated nitrogen is vented and the separated carbon dioxide is stored.

In this embodiment, since the density of nitrogen is lower than that of carbon dioxide, nitrogen will float above carbon dioxide after being pressurized to a certain range. In this way, pressurized treatment is carried out in a container with an opening on the upper end. When the pressure in the container is sufficient to separate carbon dioxide and nitrogen, the upper opening is opened to discharge the nitrogen gas, so that carbon dioxide can be collected. Although the emission of carbon dioxide in the air will cause environmental pollution, it can be used in industrial and agricultural production, so that carbon dioxide can be effectively used rationally and avoid polluting the environment.

Referring to Fig. 2, corresponding to the above-mentioned automobile exhaust treatment method, the present invention also provides an automobile exhaust treatment system, comprising:

The detection module 101 is used to monitor the exhaust gas at the outlet of the automobile exhaust gas purifier in real time, and analyze the exhaust gas to obtain the types and contents of various harmful gases in the exhaust gas;

An identification module 102, configured to identify each harmful gas according to the type of harmful gas;

The first judging module 103 is used to judge whether the tail gas is the tail gas discharged beyond the limit according to the content of various harmful gases;

The second judging module 104 is used to judge whether the harmful gas discharged beyond the limit in the tail gas contains only nitric oxide according to the mark when the judging result of the first judging module 103 is yes;

The nitric oxide processing module 105 is configured to generate a catalytic reaction command when the judgment result of the second judging module 104 is yes, through which the tail gas is discharged into the photocatalytic reactor for nitric oxide treatment.

As a preferred embodiment, a kind of automobile tail gas treatment system of the present invention can also comprise:

The carbon monoxide processing module is used to generate an absorption instruction if it is judged according to the label that the harmful gas discharged beyond the limit also contains carbon monoxide, and after the nitric oxide is processed, the exhaust gas is discharged to a carbon monoxide absorbing Carry out carbon monoxide treatment in the container of the agent.

Preferably, the nitric oxide treatment module may include:

The concentration calculation module is used to obtain the infrared light intensity obtained after the infrared rays pass through the exhaust gas, and calculate the concentration of nitric oxide in the exhaust gas according to the infrared light intensity;

A parameter acquisition module, used to acquire the speed of the automobile engine and the current temperature in the photocatalytic reactor in real time;

The speed control module is used to calculate a reference speed according to the rotation speed, current temperature and concentration, and adjust the speed of exhaust gas discharged into the photocatalytic reactor according to the reference speed.

Other technical features of the above-mentioned vehicle exhaust treatment system are the same as those of the vehicle exhaust treatment method of the present invention, and will not be repeated here.

In summary, the automobile exhaust treatment method and system of the present invention mainly carry out secondary treatment on automobile exhaust, by detecting the types and contents of harmful gases contained in automobile exhaust, and marking various harmful gases, according to Labeling and content will deal with the harmful gases that exceed the standard, especially nitric oxide, so as to achieve targeted treatment of harmful gases, which can effectively improve the efficiency of exhaust gas treatment and avoid pollution caused by exhaust gas to the environment when auto parts fail and bodily harm.

It should be noted that the automobile exhaust purifiers in the various embodiments of the present invention can all be prior art.

Those skilled in the art can make various other corresponding changes and deformations according to the above-described technical solutions and concepts, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims (10)

1. a vehicle maintenance service method, it is characterised in that comprise the steps:

The tail gas of automobile exhaust purifier outlet is monitored in real time, and tail gas is analyzed obtaining kind and the content of various harmful gass in tail gas；

Each harmful gas is identified by the kind according to harmful gas；

Content according to various harmful gass judges whether tail gas is the tail gas discharged that transfinites；

The most then identify whether the harmful gas judging to transfinite in tail gas discharge comprises only nitric oxide according to described；

If comprising only nitric oxide according to the described harmful gas judging to transfinite in tail gas discharge that identifies, then generate catalytic reaction instruction, exhaust emissions to photo catalysis reactor will carry out nitric oxide process by the instruction of this catalytic reaction.

Vehicle maintenance service method the most according to claim 1, it is characterized in that, if judging tail gas to transfinite the harmful gas discharged possibly together with carbon monoxide according to described mark, then generate and absorb instruction, and after having processed nitric oxide, exhaust emissions to the container have absorbents of carbon monoxide will carry out carbon monoxide process by this absorption instruction.

Vehicle maintenance service method the most according to claim 2, it is characterized in that, described absorbents of carbon monoxide is the compositions being made up of the two-element match of the nitride being loaded with on porous inorganic carrier and its and copper chloride, and in said composition, nitride accounts for 0.4-0.8 mol ratio；Described inorganic carrier includes: porous ceramics, activated carbon or titanium oxide；Described nitride be pyridine andCompositions.

Vehicle maintenance service method the most according to claim 1, it is characterised in that the described tail gas to automobile exhaust purifier outlet monitors in real time, and tail gas is analyzed obtaining the kind of various harmful gass and the process of content in tail gas includes:

By the way of infrared detection, tail gas is monitored in real time；

According to absorbed ultrared wave-length coverage and absorbed degree, generate the corresponding signal of telecommunication；

Kind and the content of harmful gas is drawn according to this signal of telecommunication analysis.

Vehicle maintenance service method the most according to claim 4, it is characterised in that before draw kind and the content step of harmful gas according to this signal of telecommunication analysis, also includes being filtered successively by this signal of telecommunication and the step of processing and amplifying.

Vehicle maintenance service method the most according to claim 1, it is characterised in that described the process carrying out nitric oxide process in exhaust emissions to photo catalysis reactor is included:

Obtain infrared light intensity obtained after infrared ray passes tail gas, and according to nitric oxide production concentration in described infrared light Strength co-mputation tail gas；

Current Temperatures in the real-time rotating speed obtaining automobile engine and described photo catalysis reactor；

Calculate reference velocity according to described rotating speed, Current Temperatures and densitometer, and regulate exhaust emissions to the speed in photo catalysis reactor according to described reference velocity.

Vehicle maintenance service method the most according to claim 1, it is characterised in that after tail gas is processed, also include:

The most processed vehicle exhaust is collected, and carries out being forced into the carbon dioxide in tail gas and nitrogen are separated；

Nitrogen discharge after separating is gone out, and stores the carbon dioxide separated.

8. a vehicle maintenance service system, it is characterised in that including:

Detection module, for monitoring the tail gas of automobile exhaust purifier outlet in real time, and is analyzed obtaining kind and the content of various harmful gass in tail gas to tail gas；

Mark module, for being identified each harmful gas according to the kind of harmful gas；

According to the content of various harmful gass, first judge module, for judging whether tail gas is the tail gas discharged that transfinites；

According to described, second judge module, for when the judged result of described first judge module is for being, identifies whether the harmful gas judging to transfinite in tail gas discharge comprises only nitric oxide；

Nitric oxide processing module, for when the judged result of described second judge module is for being, generates catalytic reaction instruction, will carry out nitric oxide process by the instruction of this catalytic reaction in exhaust emissions to photo catalysis reactor.

Vehicle maintenance service system the most according to claim 8, it is characterised in that also include:

Carbon monoxide processing module, if for according to described mark judge tail gas transfinites the harmful gas discharged possibly together with carbon monoxide time, then generate and absorb instruction, and after having processed nitric oxide, exhaust emissions to the container have absorbents of carbon monoxide will carry out carbon monoxide process by this absorption instruction.

Vehicle maintenance service system the most according to claim 8 or claim 9, it is characterised in that described nitric oxide processing module includes:

Concentration calculation module, for obtaining the infrared light intensity obtained by infrared ray passes after tail gas, and according to nitric oxide production concentration in described infrared light Strength co-mputation tail gas；

Parameter acquisition module, the Current Temperatures in the rotating speed obtaining automobile engine in real time and described photo catalysis reactor；

Rate control module, for calculating reference velocity according to described rotating speed, Current Temperatures and densitometer, and regulates exhaust emissions to the speed in photo catalysis reactor according to described reference velocity.