CN210347254U

CN210347254U - Be used for interior flue gas sampling device of boiler flue

Info

Publication number: CN210347254U
Application number: CN201920616740.6U
Authority: CN
Inventors: 赵军伟; 付瑞; 李鹏涛; 寇立强
Original assignee: Shaanxi Yite Measurement And Control Technology Co Ltd
Current assignee: Shaanxi Yite Measurement And Control Technology Co Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-04-17
Anticipated expiration: 2029-04-30

Abstract

The utility model relates to the technical field of flue gas pollutant detection in a boiler flue of a coal-fired power plant, in particular to a flue gas sampling device used in the boiler flue, which comprises a sampling tube, wherein the sampling tube is vertically inserted into a flue gas pipeline, a plurality of sampling tubes are uniformly arranged on the same cross section in the flue gas pipeline, each sampling tube is uniformly provided with a plurality of conical sampling ports along the axial direction, and each sampling port is arranged in a way of being opposite to the flue gas flow direction; the sampling device further comprises a sampling main pipe, a pump, a collecting tank and a smoke analyzer. This novel device simple structure, cost of manufacture are low, easily promote, and it is through a plurality of netted thief holes of rational arrangement in flue gas pipeline, has solved the content problem that single-point sample can't accurately reflect flue gas chemical composition in the whole pipeline, makes the testing result accurate to the required reasonable ammonia volume of spouting of control denitration improves denitration nitrogen oxide and discharges the control quality, satisfies the environmental protection and discharges the index requirement.

Description

Be used for interior flue gas sampling device of boiler flue

Technical Field

The utility model relates to a flue gas pollutant detects technical field in the coal fired power plant boiler flue, concretely relates to be used for flue gas sampling device in the boiler flue.

Background

Flue gas discharged by boiler combustion of a thermal power plant contains a large amount of nitrogen oxides, and is one of main pollutants of the environment and atmosphere, along with the unappreciation of China on the environment, the total amount control range of the nitrogen oxides for energy conservation and emission reduction is proposed in China particularly in the period of 'twelve five' and 'thirteen five', and the essence of controlling the nitrogen oxides is 'denitration'.

Therefore, the sampling detection of the denitrated flue gas is very important. Most of the existing coal-fired power plants adopt single-point sampling, the real condition of flue gas components in a flue cannot be reflected by the single-point sampling, and the detection result is easy to be inconsistent with the actual condition; the method has two main aspects, namely, the measurement of the nitrogen oxides before and after denitration is inaccurate, and the ammonia injection amount is influenced; secondly, the measurement of the denitrified nitrogen oxides is inaccurate, and environmental pollution is caused.

A small number of large coal-fired power plants adopt multipoint sampling, and the coal-fired power plants are complex in structure, high in cost and not easy to popularize. In addition, no matter single-point sampling or multi-point sampling, the problems that a sampling port is easy to block when smoke is dense, a smoke pipeline is easy to expand and hold back, sampling cannot be performed when smoke is rare and the like exist, so that the detection result is inaccurate, the ammonia spraying amount of denitration is influenced, and the environment is polluted.

In view of the above, the present inventors have devised the present device to solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problem that exists among the prior art, the utility model provides a be used for flue gas sampling device in boiler flue can carry out accurate sample detection to the flue gas in the coal fired boiler flue gas pipeline among the power plant to the required reasonable ammonia volume of spouting of control denitration improves denitration nitrogen oxide and discharges control quality, satisfies the environmental protection and discharges the index requirement.

The to-be-solved technical problem of the utility model is realized through following technical scheme: wrapping a sampling tube, wherein the sampling tube is vertically inserted into the flue gas pipeline, a plurality of sampling tubes are uniformly arranged on the same cross section in the flue gas pipeline, each sampling tube is uniformly provided with a plurality of sampling ports along the axial direction, each sampling port is a conical hole, the conical angle range of the conical hole is 40-60 degrees, and the sampling ports are arranged in a way of being opposite to the flow direction of the flue gas;

the sampling device also comprises a sampling main pipe, a collecting tank and a flue gas analyzer, wherein the sampling main pipe is arranged on the outer side of the flue gas pipeline, each sampling pipe is communicated to the sampling main pipe, the gas outlet end of the sampling main pipe is communicated with the collecting tank through a first connecting pipe, and the collecting tank is communicated with the flue gas analyzer through a second connecting pipe;

sampling device is still including having the pump of pressure boost and pressure release, all installs the pump on the sampling tube, just the pump is located between flue gas pipeline outer wall and the female pipe of sample.

Further, still including converging the reducing pipe, the one end that converges the reducing pipe and the female pipe's of sample end intercommunication of giving vent to anger, the other end that converges the reducing pipe passes through first connecting pipe and holding tank intercommunication.

Furthermore, the device also comprises a valve, and the valve is arranged on the first connecting pipe.

Further, the collecting tank has a sealed tank cover, and the first connecting pipe penetrates through the tank cover and extends into the collecting tank.

Furthermore, the sampling tube is made of a high-strength wear-resistant composite material.

Compared with the prior art, the utility model discloses a following beneficial effect has:

1. the utility model discloses a mode of a plurality of netted thief holes of rational arrangement in the flue gas pipeline that awaits measuring has solved the content problem of flue gas chemical composition in the whole pipeline of the unable accurate reflection of single-point sample to make testing result more accurate, according to the required ammonia volume of testing result control denitration, with the requirement of satisfying the environmental protection to nitrogen oxide emission, this device simple structure, cost of manufacture are low, easily promote in addition.

2. The utility model discloses the device has the reducer pipe of converging in the one end intercommunication of the female pipe of sample, can converge the back with the flue gas sample that the sampling tube was gained at female pipe, through converging the mixture that reducer pipe flue gas sample can be abundant again to ensure the even of sample flue gas sample, improve the testing result.

3. The utility model discloses the sample connection of device is the taper hole, and the taper angle scope in taper hole is 40 degrees to 60 degrees, and the sample connection all sets up to the flue gas flow direction dorsad, and this is calculated according to CFD (computational fluid dynamics) simulation, and after setting up like this, flue gas homogeneity, the authenticity of taking a sample more accord with the condition of flue gas pipeline, are favorable to improving the inspection precision.

4. The utility model discloses the installation can pressure boost and pressure release pump between sampling tube and the female pipe of sample, when the flue gas is rare in the flue gas pipeline, through the pressure boost effect of pump, can make the sampling tube normally gather the flue gas sample; when flue gas is intensive in the flue gas pipeline, the pressure release through the pump prevents that flue gas pipeline inflation, pipe suffocated etc. phenomenon from taking place, in addition when the sample connection blocks up, can clear through the pump sample connection.

Drawings

FIG. 1 is a schematic view of a denitration flue gas grid sampling device of the present invention;

fig. 2 is a schematic view of the sampling tube and the sampling port of the device of the present invention.

In the figure: 1. sampling a main pipe; 2. converging and reducing the pipe; 3. a valve; 4. a collection tank; 5. a flue gas analyzer; 6. a sampling tube; 7. a pump; 8. a flue gas duct; 21. a first connecting pipe; 41. a can lid; 51. a second connecting pipe; 61. a sampling port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It is to be understood that such description is merely illustrative and not restrictive of the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Example (b): the utility model discloses the device is shown in fig. 1-2, a be used for flue gas sampling device in boiler flue includes sampling tube 6, female pipe 1 of sample, holding vessel 4 and flue gas analyzer 5, sampling tube 6 inserts perpendicularly in flue gas pipeline 8, and evenly is provided with many sampling tubes 6 on the same cross-section in flue gas pipeline 8, every sampling tube 6 evenly is provided with a plurality of sample connection 61 along the axial, every sample connection 61 all sets up to the flue gas flow direction dorsad, and every sample connection 61 is the circular cone hole, circular cone drill way main aspects are towards the sampling tube 6 outside, the circular cone angle scope of circular cone hole sets up to 40 degrees to 60 degrees, sampling tube 6 adopts wear-resisting, corrosion-resistant high strength combined material, for example select for use high manganese steel to make; the parameters of the sampling tube 6 are set according to the size of the flue gas pipeline 8, the setting basis of the sampling tube 6 is to determine the number, the pipe diameter, the opening size and the angle of the sampling tube 6 according to the simulation calculation result of CFD (computational fluid dynamics), as shown in the embodiment, the external dimension of the flue gas pipeline 8 is 14000mm x 14000mm, according to the simulation calculation result of CFD (computational fluid dynamics), four vertical sampling tubes 6 are arranged on the same cross section in the flue gas pipeline 8, the diameter of the sampling tube 6 is 60mm, the cross section of the sampling tube 6 is divided into sixteen area units by adopting an equal area method, the sampling ports 61 are arranged into sixteen and distributed at the center of each area unit, the sampling ports 61 are all arranged in a way of facing away from the flue gas flow direction, the diameter of the small end of the cone of the sampling port 61 is 20mm, the cone angle is 55 degrees, and by adopting the above arrangement, because the center of each area is provided with the sampling port 61, therefore, the collected smoke sample is more uniform and accords with the actual condition in the smoke pipeline 8.

As shown in figure 1, a main pipe 1 is horizontally arranged on the outer side of a flue gas pipeline, each sampling pipe 6 is communicated with the main pipe 1, the main pipe 1 is used for merging flue gas samples collected by a sampling opening 61 together through the sampling pipes 6 to enable the flue gas samples to be uniformly mixed, in order to ensure the uniformity of the flue gas samples, a merging reducer 2 is communicated with an air outlet end of the main pipe 1, the merging reducer 2 is thick in the middle and thin in two ends, one end of the merging reducer 2 is communicated with the air outlet end of the main pipe 1, the other end of the merging reducer 2 is communicated with a collecting tank 4 through a first connecting pipe 21, the collecting tank 4 is provided with a sealed tank cover 41, the first connecting pipe 21 penetrates through the tank cover 41 and extends into the collecting tank 4, the tank cover 41 is used for preventing other gases from entering the collecting tank 4 to interfere with detection results, the flue gas samples flow through the merging reducer 2 after the main pipe 1 is merged to be sufficiently mixed, the uniformity of the flue gas samples is ensured, the detection precision is improved, the detection precision is preferably improved, the detection precision is realized, the detection result that the ammonia content of ammonia pollution caused by a nitrogen oxide is caused by a second ammonia emission control system, the ammonia emission can be caused by the ammonia emission of a smoke emission, the ammonia emission of a smoke emission control system, the ammonia emission of a smoke emission control system, the ammonia emission control system is reduced ammonia emission control system, the ammonia emission of a smoke emission device, the ammonia emission device is reduced emission device, the ammonia emission device, the.

The utility model discloses the device is still including the pump 7 that can pressure boost and pressure release, all installs the pump 7 that can pressure boost and decompression pressure release on the sampling tube 6, and pump 7 is located between 8 outer walls of flue gas pipeline and the female pipe 1 of sample, the vertical pump that the selectable model of pump 7 is YT-ISG, and this pump mainly has following advantage: firstly, the inlet and outlet calibers of the pump are the same, are positioned on the same central line, can be directly installed on a pipeline like a valve, and are simple and convenient to install; and the pump cover is provided with an air release valve which can release pressure, and flanges of the inlet and the outlet are provided with pressure taking holes, so that the normal use and maintenance of the pump can be ensured. Preferably, a pressure detection device (not shown in the figure) is further installed in the flue gas pipeline 8, the pressure detection device is connected with the pump 7 through a controller, when the flue gas in the flue gas pipeline 8 is rare, the sampling port 61 is difficult to collect a flue gas sample, at the moment, the controller controls the pump 7 to be opened for automatic pressurization, and the sampling port 61 can normally collect the flue gas sample; when flue gas too intensive reaches full jar in flue gas pipeline 8, the sample connection 61 also hardly gathers flue gas sample, get into the flue gas again behind the full jar of flue gas in addition, flue gas pipeline has taken place the inflation, phenomenons such as pipe are held back, can produce the incident such as pipe explosion when serious, but because the setting of pump 7, it is too big to detect 8 internal pressures of flue gas pipeline when pressure measurement device, automatic pressure release is opened to controller control pump 7, keep maintaining under certain reasonable pressure in the pipe, guarantee that sample connection 61 can normally gather, the potential safety hazard of discharging, in addition when sample connection 61 blocks up, can pass through sample connection 61 through the pressure that the pump produced.

Installation and use instructions: firstly, selecting a pipe section with relatively uniform and stable flue gas flow at a denitration outlet, and installing the device at a position which avoids resistance components such as an elbow, a valve, a reducer pipe and the like which are easy to generate vortex; after the installation position is determined, various parameters of the sampling tube 6 are determined through CFD (computational fluid dynamics) simulation calculation results, corresponding holes are formed in the flue gas pipeline 8 according to the parameters of the sampling tube 6, the sampling tube 6 in the device is vertically inserted into the holes formed in the flue gas pipeline 8, and then the holes are fixed through angle steel and sealed. Before the detection, the air leakage prevention test is firstly carried out, air in all sampling pipelines and collecting tanks is discharged so as to avoid interfering the detection result, and after the operation is finished, subsequent sampling detection is carried out.

The flue gas pipeline of this embodiment is square structure, and this device also is applicable to the flue gas pipeline sample of circular or other shapes, and this device simple structure, cost of manufacture are low, detect the precision height, easily promote, through the design of meshing sample connection, can realize the automatic reasonable ammonia device reliable and stable operation that spouts of denitration, improve the unit reliability, also can improve denitration nitrogen oxide emission control quality, satisfy the requirement of people to high quality living environment.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. The utility model provides a be used for flue gas sampling device in boiler flue which characterized in that: the sampling device comprises sampling tubes (6), wherein the sampling tubes (6) are vertically inserted into a flue gas pipeline (8), a plurality of sampling tubes (6) are uniformly arranged on the same cross section in the flue gas pipeline (8), each sampling tube (6) is uniformly provided with a plurality of sampling ports (61) along the axial direction, each sampling port (61) is a conical hole, the conical angle range of the conical hole is 40-60 degrees, and the sampling ports (61) are arranged in a way of facing away from the flue gas flow direction;

the sampling device further comprises a sampling main pipe (1), a collecting tank (4) and a flue gas analyzer (5), wherein the sampling main pipe (1) is arranged on the outer side of the flue gas pipeline (8), each sampling pipe (6) is communicated to the sampling main pipe (1), the gas outlet end of the sampling main pipe (1) is communicated with the collecting tank (4) through a first connecting pipe (21), and the collecting tank (4) is communicated with the flue gas analyzer (5) through a second connecting pipe (51);

sampling device is still including pump (7) that have pressure boost and pressure release, all install pump (7) on sampling tube (6), just pump (7) are located between flue gas pipeline (8) outer wall and sample female pipe (1).

2. The device for sampling the flue gas in the flue of the boiler as claimed in claim 1, wherein: still including converging reducing pipe (2), the one end of converging reducing pipe (2) and the end intercommunication of giving vent to anger of the female pipe of sample (1), the other end that converges reducing pipe (2) passes through first connecting pipe (21) and collection tank (4) intercommunication.

3. The device for sampling the flue gas in the flue of the boiler as claimed in claim 2, wherein: the device also comprises a valve (3), wherein the valve (3) is arranged on the first connecting pipe (21).

4. A device for sampling fumes in a boiler flue according to claim 3, characterized in that: the collecting tank (4) has a sealed tank cover (41), and the first connecting pipe (21) penetrates through the tank cover (41) and extends into the collecting tank (4).

5. The device for sampling the flue gas in the flue of the boiler as claimed in claim 1, wherein: the sampling tube (6) is made of a high-strength wear-resistant composite material.