CN211401833U

CN211401833U - Combined grid partition sampling probe rod structure

Info

Publication number: CN211401833U
Application number: CN201922227482.5U
Authority: CN
Inventors: 倪向阳; 汪朝伟; 李宝峰
Original assignee: Jiangsu Youerfu Electromechanical Technology Co ltd
Current assignee: Jiangsu Youerfu Electromechanical Technology Co ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-09-01
Anticipated expiration: 2029-12-12

Abstract

The utility model discloses a combined grid subarea sampling probe rod structure which is arranged in a flue below a catalyst layer and comprises a plurality of sampling structures which are uniformly distributed and a protective tube which is connected with adjacent sampling structures, wherein the protective tube fixes the sampling structures through flanges; the protection pipe of each sampling unit is assembled with the sampling structure to form a long rod structure, a sample gas pipe extends out of the sampling structure, and all the sample gas pipes of each sampling unit extend out of the same end of the long rod structure and enter a gas detection mechanism; the utility model realizes grid partition sampling of the flue gas, and sample gases at different sampling points can not be influenced; and each sampling unit is formed by combining and splicing different sampling structures, so that the limitation of platform space can be solved, and the installation, maintenance and transportation are convenient; the steel pipe structure with high hardness is used for protecting the sample gas pipe with certain mechanical strength, and the direct erosion abrasion of the sample gas pipe by the smoke is also avoided.

Description

Combined grid partition sampling probe rod structure

Technical Field

The utility model relates to a modular net subregion sampling probe rod structure belongs to the gaseous detection area of flue.

Background

At present, the power generation amount of thermal power in China still accounts for 75% of the total power generation amount in China, so NOx (nitrogen oxides, which are collectively called as NO and NO mainly) generated in the thermal power industry₂) The emission amount occupies a major position in the total NOx emission amount in China, the strict control of the NOx emission of the thermal power plant is imperative, and the method is also based on the fact that the NOx emission standard of the thermal power plant is continuously improved in recent years in China.

For controlling NOx emission of thermal power plants, Selective Catalytic Reduction (SCR) is adopted in China, and ammonia (NH) is adopted in an SCR flue gas denitration system₃) As a reducing medium, the basic principle is that ammonia gas is sprayed into a flue, fully mixed with raw flue gas and then enters a reaction tower, and under the action of a catalyst and in the presence of oxygen, the ammonia gas selectively reacts with NOx in the flue gas to generate harmless nitrogen (N)₂) And water (H)₂O )。

Currently, the evaluation of the SCR effect is judged by a single point measurement of NOx at the SCR outlet. However, this approach does not yield the NOx non-uniformity from zoned ammonia injection.

The industry is therefore beginning to step through NOx zoned measurements to more fully evaluate SCR effectiveness. And the NOx value is fed back to the ammonia injection system through the partition, and the partition ammonia injection is optimized, so that the effects of emission reduction and energy conservation are further achieved.

The principle of the subarea measurement is that a plurality of guide plates and rectifying plate structures are arranged in a flue and used for improving the flow direction of flue gas in the flue, the structures can enable the flue gas to flow in a relatively stable state, namely ammonia injection corresponding to subareas corresponds to the concentration of NOx of corresponding subareas at the downstream, and the measuring position with the best subarea NOx value is under a catalyst layer close to the lowest layer and before the flue is narrowed. However, the span size of the partition position is large, and no scheme for grid partition sampling of the position is available at present in consideration of the temperature (more than 300 ℃) of the flue gas and the scouring of the flue gas containing particles at high temperature and high speed on the structure.

At present, there are three types of SCR outlet NOx zone sampling modes in the industry: scheme 1: sampling by the partition of the side wall of the flue: in this way, the sampling rod can only extend into the flue for a limited distance (generally <2 m), so that the NOx value obtained by the sampling point cannot reflect the difference between the wall-near position and the middle position of the flue, and the difference is usually not negligible as proved by practice; scheme 2: and (3) carrying out subarea sampling at the position of the reduced section: by taking the flue size of 100 ten thousand units of a certain power plant as reference, the section of the catalyst layer is 10X13 m, the size after shrinkage is 3X4 m, and the area of the section is reduced to about 1/10. Therefore, the flue gas of different ammonia injection zones at different positions is reduced to be mixed, so that the zone NOx in the mode does not represent significance; scheme 3: large cross section grid sampling, but not compartmentalization (same on trachea): sampling is carried out by using a cross hollow sample gas pipe, and sample gas is introduced into the side wall of the sample gas pipe. The sample gas obtained in this way is a mixture of a plurality of sampling points (the tangential flow cannot be leveled), and the partition data of each sampling point cannot be obtained.

In summary, the existing SCR outlet NOx zoning sampling schemes in the industry have different defects, and a new sampling scheme and a sampling probe structure using the sampling scheme are required to be sought.

Disclosure of Invention

In order to solve the technical problem, the utility model discloses a modular net subregion sampling probe rod structure, its concrete technical scheme as follows: the utility model provides a modular net subregion sampling probe rod structure, sets up catalyst layer low reaches in the flue, its characterized in that: the sampling device comprises a plurality of uniformly distributed sampling structures and a protection pipe for connecting adjacent sampling structures, wherein the sampling structures are fixed on the protection pipe through flanges; the protection tube of every sampling unit is assembled with the sampling structure and is constituteed the stock structure, stretch out the appearance trachea in the sampling structure, all appearance tracheas of every sampling unit all stretch out to same one end of stock structure, enter into among the gas detection mechanism.

Further, the sampling structure includes sampling probe rod external member and filter, sampling probe rod external member cover is established outside the filter, the filter main part is the filter sleeve, stretches out from the filter sleeve appearance trachea, filter sleeve and protection tube mutually perpendicular set up, and during the flue gas passed catalyst layer inflow filter sleeve, the flue gas filtered the back through the filter sleeve and gets into appearance trachea to along the appearance trachea diffusion to gaseous detection mechanism.

Furthermore, gasket and flange lock are passed through at sampling probe rod external member both ends, and the protection tube forms the passageway that link up with sampling probe rod external member, and sampling probe rod external member is equipped with sampling structure installation lid at the both ends of crossing the filter sleeve, and sampling structure installation lid selects for use the screw rod with sampling probe rod external member to fix.

Furthermore, the device comprises three sampling structures which are uniformly distributed; sampling probe rod external member inside is equipped with two and the parallel fixed covers of the sample gas pipe of establishing two link up of sampling probe rod external member axis, and the gas flow direction in the sample gas pipe of along the sampling unit defines the sampling structure of installing on this sampling unit respectively and is: the sampling device comprises a first sampling structure, a second sampling structure and a third sampling structure, wherein a sample gas pipe of the first sampling structure penetrates through one sample gas pipe fixing sleeve of the second sampling structure and the third sampling structure, and a sample gas pipe of the second sampling structure penetrates through the other sample gas pipe fixing sleeve of the third sampling structure.

Has the advantages that: compared with the prior art, the utility model has the advantages of it is following:

the utility model adopts the combined grid subarea sampling probe rod structure to realize the grid subarea sampling of the flue gas, the flue gas at each sampling point flows into an independent sample gas pipe, and the influence between the sample gases at different sampling points can be avoided; and each sampling unit is formed by combining and splicing different sampling structures, so that the limitation of platform space can be solved, and the installation, maintenance and transportation are convenient; the steel pipe structure with high hardness is used for protecting the sample gas pipe, so that the sample gas pipe is protected by certain mechanical strength, and the direct erosion and abrasion of the flue gas to the sample gas pipe are also avoided.

Drawings

Figure 1 is a schematic structural diagram of the present invention,

figure 2 is an enlarged schematic view of structure a of figure 1,

figure 3 is an exploded view of various parts of the sampling structure of the present invention,

figure 4 is a schematic view of the installation state of the sampling structure of the present invention,

FIG. 5 is a schematic view of the installation state of the present invention in a flue,

FIG. 6 is a top view of the installation state of the present invention in the flue,

figure 7 is an enlarged schematic view of the B structure of figure 6,

wherein: 1-protection tube, 2-sampling structure, 3-flange, 4-catalyst layer, 5-flue, 201-sampling probe rod kit, 201-1-kit cylinder, 201-2-sample gas tube fixing sleeve, 202-gasket, 203-filter, 203-1-sample gas tube, 203-2-filter sleeve, 204-sampling structure mounting cover and 205-screw rod.

Detailed Description

The present invention will be further clarified by the following description with reference to the attached drawings and specific examples, which should be understood as being merely illustrative of the present invention and not limiting the scope of the present invention, and modifications of various equivalent forms of the present invention by those skilled in the art after reading the present invention, all fall within the scope defined by the appended claims of the present application.

The principle of the zoned measurement of the NOx in the flue is that a plurality of guide plates and rectifying plate structures are arranged in the flue and used for improving the flow direction of the flue gas in the flue, the structures can enable the flue gas to flow in a relatively stable state, namely ammonia injection corresponding to a zone corresponds to the concentration of the NOx in a downstream corresponding zone, and the optimal measurement position of the zoned NOx value is under a catalyst layer close to the lowest layer and before the flue is narrowed. However, the span size of the partition position is large, and no scheme for grid partition sampling of the position is available at present in consideration of the temperature (more than 300 ℃) of the flue gas and the scouring of the flue gas containing particles at high temperature and high speed on the structure.

The combined grid subarea sampling probe rod structure comprises three sampling units, as shown in fig. 5 and 6, wherein each sampling unit is arranged below a catalyst layer 4 and horizontally strides on an opposite flue 5, and the positions of the three sampling units in the flue are uniform; as shown in fig. 1 and 2, each sampling unit comprises three sampling structures 2 which are uniformly distributed and a protection tube 1 which is connected with the adjacent sampling structures 2, wherein the sampling structures 2 are fixed on the protection tube 1 through a flange 3; the protection tube of each sampling unit is assembled with the sampling structure 2 to form a long rod structure, as shown in fig. 3, 4, 6 and 7, a sample gas tube 203-1 extends out of the sampling structure 2, and all the sample gas tubes 203-1 of each sampling unit extend out of the same end of the long rod structure and enter a gas detection mechanism; the sampling structure 2 comprises a sampling probe rod suite 201 and a filter 203, the sampling probe rod suite 201 is sleeved outside the filter 203, the main body of the filter 203 is a filter sleeve 203-2, a sample gas pipe 203-1 extends out of the filter sleeve 203-2, the filter sleeve 203-2 is perpendicular to the protection pipe 1, the filter sleeve 203-2 is used for collecting the flue gas, the flue gas passes through the catalyst layer 4 and flows into the filter sleeve 203-2, the flue gas enters the sample gas pipe 203-1 after being filtered by the filter sleeve 203-2, and diffuses to the gas detection mechanism along the sample gas pipe 203-1, two sample gas pipe fixing sleeves 201-2 which are parallel to the central axis of the sample gas pipe 201 and are provided with two through holes are arranged inside the sample gas pipe 201, and the sampling structures 2 arranged on the sampling unit are respectively defined along the gas flowing direction in the sample gas pipe 203-1 of the sampling unit as follows: the sampling device comprises a first sampling structure, a second sampling structure and a third sampling structure, wherein a sampling gas pipe 203-1 of the first sampling structure penetrates through one sampling gas pipe fixing sleeve 201-2 of the second sampling structure and the third sampling structure, and a sampling gas pipe 203-1 of the second sampling structure penetrates through the other sampling gas pipe fixing sleeve 201-2 of the third sampling structure, so that grid partition sampling is performed on smoke, the smoke at each sampling point flows into an independent sampling gas pipe, and the influence among the sample gases at different sampling points is avoided; and each sampling unit is formed by combining and splicing different sampling structures, so that the limitation of platform space can be solved, and the installation, maintenance and transportation are convenient; the two ends of the sampling probe rod suite 201 are buckled with the flange 3 through gaskets 202, the protection tube 1 and the sampling probe rod suite 201 form a through channel, sampling structure mounting covers 204 are arranged at the two ends of the filter sleeve 203-2 of the sampling probe rod suite 201, and the sampling structure mounting covers 204 and the sampling probe rod suite 201 are fixed through screws 205; and the protection tube 1 is made of steel materials with high hardness or other heat-resistant materials, protects the sample gas tube, provides certain mechanical strength protection for the sample gas tube, and avoids direct erosion and abrasion of the flue gas to the sample gas tube.

When the combined type grid subarea sampling probe rod structure is used, the combined type grid subarea sampling probe rod structure is arranged according to a graph 5 and a graph 6, sample gas enters the filter 203 and is filtered by the filter sleeve 203-2 to enter the sample gas pipe 203-1, different gas pipes 203-1 on the same sampling unit are fixed in positions according to the graph 6 and the graph 7, gas in the sampling structure 2 without sampling points enters the corresponding sample gas pipe 203-1, the gas does not influence each other, the obtained gas is used for higher detection precision, and the sample gas pipe 203-1 is protected by the protection tube, so that the service life of the gas pipe is prolonged.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a modular net subregion sampling probe rod structure, sets up catalyst layer (4) low reaches in the flue, its characterized in that: the sampling device comprises a plurality of uniformly distributed sampling structures (2) and a protection tube (1) connected with the adjacent sampling structures (2), wherein the sampling structures (2) are fixed on the protection tube (1) through flanges (3); the protection tube of every sampling unit is assembled with sampling structure (2) and is constituteed the stock structure, stretch out appearance trachea (203-1) in sampling structure (2), all appearance tracheas (203-1) of every sampling unit all stretch out to the same end of stock structure, enter into in the gaseous detection mechanism.

2. The modular grid zoned sampling probe structure of claim 1, wherein: sampling structure (2) are including sampling probe rod external member (201) and filter (203), sampling probe rod external member (201) cover is established outside filter (203), filter (203) main part is for filtering cover (203-2), stretches out from filtering cover (203-2) sample trachea (203-1), filter cover (203-2) and protection tube (1) mutually perpendicular set up, and the flue gas passes catalyst layer (4) and flows into in filtering cover (203-2), and the flue gas filters back through filtering cover (203-2) and gets into in sample trachea (203-1) to along sample trachea (203-1) diffusion to in the gaseous detection mechanism.

3. The modular grid zoned sampling probe structure of claim 2, wherein: sampling probe rod external member (201) both ends are passed through gasket (202) and flange (3) lock, and protection tube (1) and sampling probe rod external member (201) form the passageway that link up, and sampling probe rod external member (201) are equipped with sampling structure installation lid (204) at the both ends of crossing filter sleeve (203-2), and sampling structure installation lid (204) select for use screw rod (205) with sampling probe rod external member (201) to fix.

4. The modular grid zoned sampling probe structure of claim 3, wherein: comprises three evenly distributed sampling structures (2); sampling probe rod external member (201) inside be equipped with two with sampling probe rod external member (201) axis parallel establish two fixed covers (201-2) of the sample gas pipe that link up, along the gas flow direction in the sample gas pipe (203-1) of sampling unit respectively define sampling structure (2) of installing on this sampling unit and be: the sampling device comprises a first sampling structure, a second sampling structure and a third sampling structure, wherein a sampling gas pipe (203-1) of the first sampling structure penetrates through one sampling gas pipe fixing sleeve (201-2) of the second sampling structure and the third sampling structure, and a sampling gas pipe (203-1) of the second sampling structure penetrates through the other sampling gas pipe fixing sleeve (201-2) of the third sampling structure.