阅读说明：本技术 一种不受氨影响的测量nox的系统 (NO measurement without influence of ammoniaXOf (2) a ) 是由 朱敏霖 于 2020-11-30 设计创作，主要内容包括：本申请实施例公开了一种不受氨影响的测量NO-X的系统,用于在含有不同气体的测量环境下提高NO-X的测量精度。本申请实施例包括：D1容纳腔、D2容纳腔、D3容纳腔、P～-电极、P～+电极、催化电极以及NH-3测量结构；D3容纳腔与NH-3测量结构并列连接,NH-3测量结构用于测量NH-3通过一定反应后产生的电流值；D1容纳腔与D2容纳腔设于D3容纳腔,D1容纳腔与D2容纳腔连接,D1容纳腔用于承载含有NO-X的尾气,D2容纳腔用于承载从D1容纳腔释放的气体；P～+电极设于D3容纳腔,P～-电极设于D1容纳腔,P～+电极与P～-电极用于配合泵出通入D1容纳腔内尾气中的O～(2-)；催化电极设于D2容纳腔,用于催化NO-X的分解。(The embodiment of the application discloses a method for measuring NO without being influenced by ammonia X For increasing NO in a measurement environment containing different gases X The measurement accuracy of (2). The embodiment of the application comprises the following steps: d1 accommodating cavity, D2 accommodating cavity, D3 accommodating cavity, P ‑ Electrode, P + Electrode, catalytic electrode and NH 3 A measurement structure; d3 accommodating cavity and NH 3 Measurement structures are connected in parallel, NH 3 The measuring structure is used for measuring NH 3 The current value generated after certain reaction; the D1 accommodating cavity and the D2 accommodating cavity are arranged on the D3 accommodating cavity, the D1 accommodating cavity is connected with the D2 accommodating cavity, and the D1 accommodating cavity is used for bearing NO X The D2 containing chamber is used for carrying the gas released from the D1 containing chamber; p + The electrode is arranged in a D3 accommodating cavity, P ‑ The electrode is arranged in a D1 accommodating cavity, P + Electrode and P ‑ The electrode is used for matching with the pump to pump out O in tail gas introduced into the D1 accommodating cavity 2‑ (ii) a The catalytic electrode is arranged in the D2 accommodating cavity and is used for catalyzing NO X Decomposition of (3).)

1. NO measurement without influence of ammonia_XThe system of (a), comprising:

d1 accommodating cavity, D2 accommodating cavity, D3 accommodating cavity, P^-Electrode, P⁺Electrode, catalytic electrode and NH₃A measurement structure;

the D3 accommodating cavity and the NH₃The measurement structures are connected in parallel, the NH₃The measuring structure is used for measuring NH₃The current value generated after certain reaction;

the D1 holds the chamber with the D2 holds the chamber and locates D3 holds the chamber, the D1 holds the chamber with D2 holds the chamber and is connected, D1 holds the chamber and is used for bearing and contains NO_XThe D2 containing chamber is used for carrying the gas released from the D1 containing chamber;

the P is⁺The electrode is arranged in the D3 accommodating cavity, P^-The electrode is arranged in the D1 accommodating cavity, P⁺Electrode and said P^-Electrodes for pump-fitting into the D1 accommodating cavityO in internal exhaust gas^2-；

The catalytic electrode is arranged in the D2 accommodating cavity and is used for catalyzing NO_XDecomposition of (3).

2. The system of claim 1, wherein the NH is₃The measurement structure includes:

d4 accommodating cavity containing OH^-The electrolyte, positive and negative electrodes of (1);

said OH group containing^-Is arranged in the D4 containing cavity and contains OH^-As NH₃The D4 accommodating cavity is used for bearing residual NH₃The tail gas of (2);

the positive and negative electrodes are arranged in the OH-containing cavity through the D4 accommodating cavity^-The air inlet end of the D4 accommodating cavity is connected with the negative electrode of the positive and negative electrodes, the air outlet end of the D4 accommodating cavity is connected with the positive electrode of the positive and negative electrodes, and the positive and negative electrodes are used for catalyzing NH₃With OH^-And (4) reacting.

3. The system of claim 2, further comprising: d5 accommodating chamber;

the D3 accommodating cavity and the NH₃The measuring structure is arranged in the D5 accommodating cavity, wherein the outer wall part of the D3 accommodating cavity and the NH₃The outer wall portions of the measuring structure respectively fit against the inner wall portions of the D5 accommodating chamber.

4. The system of claim 3, further comprising: an electric heating wire;

electric heating wire one end with D3 holds the interior wall portion in chamber and connects, the other end with D1 holds the interior wall portion in chamber and connects, is used for letting in tail gas D1 hold the chamber and before D2 holds the chamber, the evaporation D1 holds the chamber and D2 holds the drop of water of chamber interior wall portion.

5. The system of claim 4, further comprising: a gas mass detector;

the gas quality detector is arranged at the gas inlet end of the D5 accommodating cavity and used for detecting the quality of tail gas introduced into the D5 accommodating cavity.

6. The system of claim 1, further comprising: a first current detector;

the first current detector is arranged at the exhaust end of the D3 accommodating cavity and used for detecting a first current value generated by chemical reaction when the chemical reaction is carried out in the D2 accommodating cavity, and a first content value corresponding to gas is obtained through the first current value.

7. The system of claim 6, further comprising: a second current detecting meter;

the second current detector is arranged at the exhaust end of the D4 accommodating cavity and used for detecting NH₃In the presence of an OH group through the^-And detecting a second current value generated by the catalytic chemical reaction of the positive electrode and the negative electrode during the electrolyte solution, and acquiring a second content value corresponding to the gas according to the second current value.

8. The system of claim 7, further comprising: a measurement display;

the measurement display is externally connected with the D5 accommodating cavity and is used for displaying NO measured by the system_XThe content value of the gas.

9. The system of any one of claims 1 to 8, further comprising: a particle filter screen;

the granule filter screen is located the D5 holds the inlet end of chamber, the granule filter screen is used for letting in tail gas when D5 holds the chamber, filters granular impurity and enters into and holds the intracavity.

10. The system of claim 9, wherein the particulate filter is periodically desorbed with a clean gas of impurities on the particulate filter.

Technical Field

The embodiment of the application relates to the technical field of engine aftertreatment, in particular to a method for measuring NO without being influenced by ammonia_XThe system of (1).

Background

The diesel engine has the advantages of strong power performance, low oil consumption and the like, and is widely applied to medium and heavy vehicles. But as society pays more and more attention to environmental protection, the pollution problem of diesel vehicles is more and more prominent.

At present, diesel vehicles are used for reducing NO_XThe measure of emission is that urea is firstly sprayed into the tail gas of the diesel engine, then the urea is hydrolyzed into ammonia gas, and finally the ammonia gas and NO of the tail gas_XTo perform chemical reactionConverted to non-polluting nitrogen.

However, under some engine abrupt operating conditions, the ammonia is not completely mixed with NO_XReact to leave NO_XThe ammonia gas of the reaction is discharged directly, since NO is now arranged at the end of the catalyst remote from the engine_XThe sensor has NO identification function, and the discharged ammonia gas can be judged as NO by mistake_XThus, NO_XThe value measured by the sensor not only includes NO_XAmmonia gas is also included, resulting in inaccurate measurements in measurement environments containing different gases.

Disclosure of Invention

The embodiment of the application provides a method for measuring NO without being influenced by ammonia_XFor increasing NO in a measurement environment containing different gases_XThe measurement accuracy of (2).

The embodiments of the present application provide for measuring NO without being affected by ammonia_XThe system of (1), comprising:

d1 accommodating cavity, D2 accommodating cavity, D3 accommodating cavity, P^-Electrode, P⁺Electrode, catalytic electrode and NH₃A measurement structure;

the D3 accommodating cavity and the NH₃The measurement structures are connected in parallel, the NH₃The measuring structure is used for measuring NH₃The current value generated after certain reaction;

the D1 holds the chamber with the D2 holds the chamber and locates D3 holds the chamber, the D1 holds the chamber with D2 holds the chamber and is connected, D1 holds the chamber and is used for bearing and contains NO_XThe D2 containing chamber is used for carrying the gas released from the D1 containing chamber;

the P is⁺The electrode is arranged in the D3 accommodating cavity, P^-The electrode is arranged in the D1 accommodating cavity, P⁺Electrode and said P^-The electrode is used for matching with and pumping out O in tail gas introduced into the D1 accommodating cavity^2-；

The catalytic electrode is arranged in the D2 accommodating cavity and is used for catalyzing NO_XDecomposition of (3).

Optionally, the NH₃The measurement structure includes:

d4 accommodating cavity containing OH^-The electrolyte, positive and negative electrodes of (1);

said OH group containing^-Is arranged in the D4 containing cavity and contains OH^-As NH₃The D4 accommodating cavity is used for bearing residual NH₃The tail gas of (2);

the positive and negative electrodes are arranged in the OH-containing cavity through the D4 accommodating cavity^-The air inlet end of the D4 accommodating cavity is connected with the negative electrode of the positive and negative electrodes, the air outlet end of the D4 accommodating cavity is connected with the positive electrode of the positive and negative electrodes, and the positive and negative electrodes are used for catalyzing NH₃With OH^-And (4) reacting.

Optionally, the system further includes:

d5 accommodating chamber;

d3 accommodating cavity and the NH₃The measuring structure is arranged in the D5 accommodating cavity, wherein the outer wall part of the D3 accommodating cavity and the NH₃The outer wall portions of the measuring structure respectively fit against the inner wall portions of the D5 accommodating chamber.

Optionally, the system further includes:

an electric heating wire;

electric heating wire one end with D3 holds the interior wall portion in chamber and connects, the other end with D1 holds the interior wall portion in chamber and connects, is used for letting in tail gas D1 hold the chamber and before D2 holds the chamber, the evaporation D1 holds the chamber and D2 holds the drop of water of chamber interior wall portion.

Optionally, the system further includes:

a gas mass detector;

the gas quality detector is arranged at the gas inlet end of the D5 accommodating cavity and used for detecting the quality of tail gas introduced into the D5 accommodating cavity.

Optionally, the system further includes:

a first current detector;

the first current detector is arranged at the exhaust end of the D3 accommodating cavity and used for detecting a first current value generated by chemical reaction when the chemical reaction is carried out in the D2 accommodating cavity, and a first content value corresponding to gas is obtained through the first current value.

Optionally, the system further includes:

a second current detecting meter;

the second current detector is arranged at the exhaust end of the D4 accommodating cavity and used for detecting NH₃In the presence of an OH group through the^-And detecting a second current value generated by the catalytic chemical reaction of the positive electrode and the negative electrode during the electrolyte solution, and acquiring a second content value corresponding to the gas according to the second current value.

Optionally, the system further includes:

a measurement display;

the measurement display is externally connected with the D5 accommodating cavity and is used for displaying NO measured by the system_XThe content value of the gas.

Optionally, the system further includes:

a particle filter screen;

the granule filter screen is located the D5 holds the inlet end of chamber, the granule filter screen is used for letting in tail gas when D5 holds the chamber, filters granular impurity and enters into and holds the intracavity.

Optionally, the particle filter screen periodically desorbs impurities on the particle filter screen through clean gas.

According to the technical scheme, the embodiment of the application has the following advantages:

the measurement of NO unaffected by ammonia provided by the examples of the present application_XWhen the exhaust gas is introduced into the system, the exhaust gas can pass through the P-shaped bodies respectively arranged in the D1 accommodating cavities and the D3 accommodating cavities^-Electrode, P⁺The water in the tail gas is removed by the electrode, and NO is contained_XThe residual tail gas of the catalyst passes through a catalytic electrode to remove NO_XDecomposition to O₂And N₂So as to obtain the current value generated after the decomposition reaction in the D2 accommodating cavity, and NH₃The measuring structure is used for measuring NH₃The current value generated after the chemical reaction. According to the scheme, NO in the measured tail gas_XDuring the content process, the liquid can be accommodated in the cavity according to D2Current value and NH generated after decomposition reaction₃Obtaining corresponding content value through current value generated after chemical reaction, and detecting the content value corresponding to the current value and NH after decomposition reaction in the D2 accommodating cavity₃Carrying out certain operation analysis through the content value corresponding to the current value generated after the chemical reaction to obtain NO_XThereby realizing the improvement of NO under the measuring environment containing different gases_XThe measurement accuracy of (2).

Drawings

FIG. 1 is a diagram of a method for measuring NO without being affected by ammonia_XThe overall structure of the system of (1);

FIG. 2 is a graph of measured NO unaffected by ammonia_XAnother overall structure schematic diagram of the system of (1);

FIG. 3 is a graph of measured NO unaffected by ammonia_XNH of the system of₃And (4) a schematic diagram of a measurement structure.

Detailed Description

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for explaining relative positional relationships between the respective members or components, and do not particularly limit specific mounting orientations of the respective members or components.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In addition, the structures, the proportions, the sizes, and the like, which are illustrated in the accompanying drawings and described in the present application, are intended to be considered illustrative and not restrictive, and therefore, not limiting, since those skilled in the art will understand and read the present application, it is understood that any modifications of the structures, changes in the proportions, or adjustments in the sizes, which are not necessarily essential to the practice of the present application, are intended to be within the scope of the present disclosure without affecting the efficacy and attainment of the same.

The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a method for measuring NO without being influenced by ammonia_XFor increasing NO in a measurement environment containing different gases_XThe measurement accuracy of (2).

Referring to FIGS. 1 to 3, embodiments of the present application provide a method for measuring NO without ammonia effect_XThe system of (1), comprising: d1 accommodating cavity 1, D2 accommodating cavity 2, D3 accommodating cavity 3 and P^-Electrode 4, P⁺Electrode 5, catalytic electrode 6, and NH₃A measurement structure 7; d3 accommodating cavity 3 and NH₃Measurement structures 7 connected in parallel, NH₃The measuring arrangement 7 is used for measuring NH₃The current value generated after certain reaction; the D1 accommodating cavity 1 and the D2 accommodating cavity 2 are arranged in the D3 accommodating cavity 3, the D1 accommodating cavity 1 is connected with the D2 accommodating cavity 2, and the D1 accommodating cavity 1 is used for bearing NO_XD2 containing chamber 2 for carrying the gas released from D1 containing chamber 1; p⁺The electrode 5 is arranged in the D3 accommodating cavity 3, P^-The electrode 4 is arranged in the accommodating cavity 1, P of the D1⁺Electrode 5 and P^-The electrode 4 is used for being matched with a pump to pump out O in tail gas introduced into the D1 accommodating cavity 1^2-(ii) a The catalytic electrode 6 is arranged in the D2 accommodating cavity 2 and is used for catalyzing NO_XDecomposition of (3).

The embodiment of the application provides a method for measuring NO without being influenced by ammonia_XThe system may be through NH₃The measuring structure 7 measures NH contained in the tail gas₃The content can be determined by respectively arranging P in the accommodating cavities D1 and D3^-Electrode, P⁺The electrodes remove the moisture in the tail gas, so that the rest gas is respectively introduced into the corresponding accommodating cavities to generate chemical reaction, the gas content is detected after the reaction, and the NH is detected₃The NO is obtained by certain calculation of the content and the gas content_XActual content values, which enable an increase in NO in a measurement environment containing different gases_XThe measurement accuracy of the measurement.

In practical application, NH₃The measuring structure 7 comprises a D4 accommodating cavity 31 containing OH^-The electrolyte and the positive and negative electrodes 32; the D4 accommodating cavity 31 is used for bearing residual NH₃Contains OH^-Is arranged in the D4 accommodating cavity 31 and contains OH^-OH in the electrolyte^-Can be used as NH₃Medium of reaction, for NH₃With OH^-The reaction rate of (2) is improved, and the reaction is needed to be carried out in the presence of OH through the accommodating cavity 31 of D4^-The surface of the electrolyte is provided with the positive and negative electrodes 32, and particularly, the air inlet end of the D4 accommodating cavity 31 is connected with the negative electrodes of the positive and negative electrodes 32, the air outlet end is connected with the positive electrodes of the positive and negative electrodes 32, and the positions of the two electrodes connected on the D4 accommodating cavity 31 cannot be replaced.

The current technology can only detect the content of a single gas, and when detecting a single gas, if the gas contains a gas which can react with a medium as the single gas to be detected, the measured parameters in the measuring process can be inaccurate, and in order to be able to measure a single gas under the condition of containing different gases, the D3 accommodating cavity 3 in the system needs to be matched with NH 3₃The measurement structure 7 is connected in parallel, and the parallel connection is realized by arranging the D5 accommodating cavity 21 to accommodate the D3Nano chamber 3 and NH₃The measuring structure 7 is wrapped in a way that the D3 is attached to the outer wall surface of the bottom of the accommodating cavity 3₃The outer wall surface of the top of the measuring structure 7, D3 accommodating chamber 3 and NH₃The outer wall surface of the remainder of the measurement structure 7 fits against the inner wall surface of the D5 accommodating cavity 21.

In order to ensure the dryness of the experimental environment inside the system, an electric heating wire 22 is required to be arranged inside the system, and the electric heating wire 22 is connected with the inner wall part of the D3 accommodating cavity 3 at one end and the inner wall part of the D1 accommodating cavity 1 at the other end. Before letting in tail gas D1 and hold chamber 1 and D2 and hold chamber 2, need energize for electric heating wire 22, electric heating wire 22 heats the inside ambient temperature that D3 held chamber 3 to about 800 ℃, holds the inside wall drop that holds the chamber in chamber 3 with D3 and all evaporates to guarantee the measuring precision.

Optionally, in order to measure the required parameters, a gas quality detector 23 is arranged at the gas inlet end of the D5 accommodating cavity 21 to detect the quality of the tail gas introduced into the D5 accommodating cavity 21, a first current detector 24 is arranged at the gas outlet end of the D3 accommodating cavity 3 to detect a first current value, and a second current detector 25 is arranged at the gas outlet end of the D4 accommodating cavity 31 to detect a second current value.

In practical application, the tail gas to be detected is introduced into the D5 containing cavity 21, the gas quality detector 23 detects the quality of the introduced tail gas, and when the tail gas enters the D1 containing cavity 1 through the D3 containing cavity 3, oxygen in the tail gas is in P⁺And P^-The residual gas is pumped out in the form of ions under the action of the two electrodes, and is introduced into the D2 accommodating cavity 2, and NO is generated under the action of the catalytic electrodes_XDecomposition to O₂And N₂The first current value generated by the chemical reaction is detected by the first current detector 24, and the corresponding NO is obtained by the conversion of the reaction between the exhaust gas mass and the first current value_XA first content value Q1; the tail gas enters the accommodating cavity 31 containing OH through the D4^-At this time, the anion OH in the solution^-Moves to the negative electrode of the positive and negative electrodes 32, where NH contained in the exhaust gas₃With OH^-Oxidation reaction to N₂The specific chemical reaction equation is 2NH₃+6OH^-＝N₂+6H₂O, detecting a second current value generated by the chemical reaction by a second current detector 25, and obtaining corresponding NH according to a reaction conversion mode of the quality of the exhaust gas and the second current value₃Then the actual NO present in the mass of exhaust gas can be calculated from the values of Q1 and Q2 obtained by the second content value Q2_XThe formula of the content Q3 is Q3-Q1-Q2.

Optionally, the measurement display 26 is externally connected to the D5 accommodating cavity 21, a conversion program between parameters in the system is loaded into the measurement display 26, and after the measurement display 26 operates, the NO measured by the system can be displayed on the display screen of the measurement display 26_XThe actual content value of the gas.

Optionally, the system is provided with a particle filter screen 27 at the air inlet end of the D5 accommodating cavity 21, and the filter screen is used for filtering particulate impurities entrained in the tail gas.

Alternatively, the particle filter 27 is periodically passed through a clean gas so that the particles blocked by the filter are desorbed.