CN217466379U - Flue gas sampling device of denitration system of thermal power plant - Google Patents
Flue gas sampling device of denitration system of thermal power plant Download PDFInfo
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- CN217466379U CN217466379U CN202220797203.8U CN202220797203U CN217466379U CN 217466379 U CN217466379 U CN 217466379U CN 202220797203 U CN202220797203 U CN 202220797203U CN 217466379 U CN217466379 U CN 217466379U
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Abstract
The utility model discloses a flue gas sampling device of a denitration system of a thermal power plant, which comprises a denitration flue, wherein the lower end of the denitration flue is connected with an air extraction sampling structure; the air extraction sampling structure comprises: the device comprises six three-measuring-point probe rods, six preposed filter elements, six sampling pipes, six manual switching valves, a main pipe, a back-blowing electromagnetic valve, a sampling electromagnetic valve, a first manual valve, a flue gas mixing and sampling assembly and a conveying assembly; the utility model relates to a thermal power unit technical field, new denitration net flue gas sampling device has avoided the flue gas to cause the risk of corruption and jam to the sample pipeline, uses compressed air to guarantee the cleanness of pipeline and blending tank, can not cause extra pollution, reduces the maintenance cost in the operation simultaneously, has improved the stability of denitration export CEMS system.
Description
Technical Field
The utility model relates to a thermal power unit technical field specifically is a denitration system flue gas sampling device of thermal power plant.
Background
In order to accurately measure the concentration of NOX in a flue behind an SCR reactor and obtain accurate denitration efficiency, a plurality of thermal power plants adopt a grid sampling device to realize accurate ammonia spraying and SCR optimal operation, for sampling flue gas, a denitration outlet sampling probe is usually arranged on a vertical flue from the SCR reactor to an inlet of an air preheater, each sampling pipe is converged into a sampling main pipe and then enters a mixing tank, the flue gas collected in the mixing tank is sent back to the outlet flue of the air preheater through a pipeline, the flue gas flows by utilizing the front-back differential pressure of the air preheater to form circulation, and meanwhile, the flue gas of the mixing tank is extracted by utilizing a sampling pump and sent to a CEMS cell analyzer, the design of the method is simpler, but because the flue gas contains a large amount of dust, after the flue gas is operated for a period of time, the phenomena of corrosion and dust deposition and blockage of a sampling pipeline are easily caused, so that the stable operation of a denitration system is influenced.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a thermal power plant deNOx systems flue gas sampling device has solved current flue gas sampling mode, because the flue gas contains a large amount of dusts in the flue, after a period of operation, easily causes sample pipeline corruption and deposition blocking phenomenon to influence the technical problem of deNOx systems's steady operation.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a flue gas sampling device of a thermal power plant denitration system comprises a denitration flue, wherein the lower end of the denitration flue is connected with an air extraction sampling structure;
the air extraction sampling structure comprises: the device comprises six three-measuring-point probe rods, six preposed filter elements, six sampling pipes, six manual switching valves, a main pipe, a back-blowing electromagnetic valve, a sampling electromagnetic valve, a first manual valve, a flue gas mixing and sampling assembly and a conveying assembly;
six three-measuring-point probe rods are all embedded in the denitration flue, six prepositive filter elements are all installed at one ends of the six three-measuring-point probe rods, one ends of six sampling tubes are respectively connected with the lower ends of the six three-measuring-point probe rods, one side wall surface of a main pipe is connected with the lower ends of the six sampling tubes, a back-blowing electromagnetic valve is installed at one side of the main pipe, the sampling electromagnetic valve is installed at the other side of the main pipe, a first manual valve is installed on the main pipe and located at one side of the back-blowing electromagnetic valve, a flue gas mixing sampling assembly is connected with one end of the main pipe, one end of a conveying assembly is connected with the lower end of the flue gas mixing sampling assembly, and the other end of the conveying assembly is connected with the denitration flue.
Preferably, the flue gas mixing and sampling assembly comprises: the device comprises a flue gas mixing tank, a CEMS sampling probe and a heat tracing pipeline;
the gas inlet end of the flue gas mixing tank is connected with one end of the main pipe, the CEMS sampling probe is embedded in the upper wall surface of the flue gas mixing tank, and one end of the heat tracing pipeline is connected with the CEMS sampling probe.
Preferably, the conveying assembly comprises: the device comprises a connecting pipe, a Venturi jet pump, an air inlet pipe, a mixed gas return pipe and a second manual valve;
connecting pipe one end with the flue gas blending tank end of giving vent to anger is connected, venturi jet pump the end of breathing in with the connecting pipe other end is connected, intake pipe one end with venturi jet pump the end of breathing in is connected, gas mixture back flow one end with venturi jet pump is given vent to anger and is held and connect, and the other end with the denitration flue is connected, the manual valve of second install in on the intake pipe.
Preferably, the venturi jet pump and the connecting pipe junction are equipped with and are used for connecting sealed first flange.
Preferably, the venturi jet pump with the intake pipe junction is equipped with and is used for connecting sealed second flange.
Preferably, a third connecting flange for connecting and sealing is arranged at the joint of the venturi jet pump and the mixed gas return pipe.
The utility model provides a thermal power plant deNOx systems flue gas sampling device. The method has the following beneficial effects: the new denitration net flue gas sampling device has avoided the flue gas to cause the risk of corruption and jam to the sample pipeline, uses compressed air to guarantee the cleanness of pipeline and blending tank, can not cause extra pollution, reduces the maintenance cost in the operation simultaneously, has improved denitration export CEMS system's stability.
Drawings
FIG. 1 is the utility model relates to a structural schematic is looked to thermal power plant deNOx systems flue gas sampling device's owner.
FIG. 2 is a gas circuit system flow chart of denitration system flue gas sampling device of thermal power plant.
In the figure: 1. the device comprises a denitration flue, 2, a three-measuring-point probe rod, 3, a front filter element, 4, a sampling pipe, 5, a manual switching valve, 6, a main pipe, 7, a back-blowing electromagnetic valve, 8, a sampling electromagnetic valve, 9, a first manual valve, 10, a flue gas mixing tank, 11, a CEMS sampling probe, 12, a heat tracing pipeline, 13, a connecting pipe, 14, a Venturi jet pump, 15, an air inlet pipe, 16, a mixed gas return pipe, 17, a second manual valve, 18, a first connecting flange, 19, a second connecting flange, 20 and a third connecting flange.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As shown in fig. 1-2, a flue gas sampling device of a denitration system of a thermal power plant comprises a denitration flue 1, wherein the lower end of the denitration flue 1 is connected with an air extraction sampling structure;
the structure of taking a sample of bleeding includes: the device comprises six three-measuring-point probe rods 2, six preposed filter elements 3, six sampling pipes 4, six manual switching valves 5, a main pipe 6, a back-blowing electromagnetic valve 7, a sampling electromagnetic valve 8, a first manual valve 9, a flue gas mixing and sampling assembly and a conveying assembly;
six three measurement station probe rods 2 all inlay and adorn in denitration flue 1, six leading filter cores 3 all install in six three measurement station probe rods 2 one end, six sampling tube 4 one ends are connected with six three measurement station probe rods 2 lower extremes respectively, 6 side wall of female pipe are connected with six sampling tube 4 lower extremes, blowback solenoid valve 7 is installed in female 6 one side, sampling solenoid valve 8 is installed in female 6 opposite side, first manual valve 9 is installed on female 6, and be located blowback solenoid valve 7 one side, the mixed sampling subassembly of flue gas is connected with female 6 one end, conveying component one end is connected with the mixed sampling subassembly lower extreme of flue gas, and the other end is connected with denitration flue 1.
It should be noted that, when sampling the flue gas in the denitration flue 1, a worker opens six manual switching valves 5, a back-blowing electromagnetic valve 7, a sampling electromagnetic valve 8, a first manual valve 9 and a second manual valve 17, connects one end of the main pipe 6 and one end of the conveying assembly to a compressed air pipeline in a factory, forms negative pressure vacuum by using high-speed jet flow of compressed air in the main pipe 6 and the conveying assembly, sucks the flue gas into the flue gas mixing and sampling assembly through each three-point probe 2 and the sampling pipe 4, performs sampling detection on the flue gas through the flue gas mixing and sampling assembly, plugs the front ends of the six three-point probe 2 through the six pre-filter elements 3, prevents foreign matters from entering the three-point probe 2 to affect flue gas sampling, and finally returns the flue gas in the flue gas mixing and sampling assembly into the denitration flue 1 through the conveying assembly, the condition that no extra pollution is generated is guaranteed, after sampling is completed, all valves are closed, the pressure of factory-used compressed air of the system is required to be 0.5Mpa at least, the air consumption of the compressed air is 0.5m3/min, the whole exhaust rate of smoke is 1m3/min, the flow rate of smoke in a pipeline of a main pipe 6 can reach more than 15m/s, the smoke mixing replacement speed and the CEMS measurement response requirement are guaranteed, and meanwhile, the speed of an air extractor for extracting sample gas can be changed by adjusting the pressure of the compressed air through the valves according to the flow rate of the smoke.
In the specific implementation process, the flue gas mixing and sampling assembly comprises: a flue gas mixing tank 10, a CEMS sampling probe 11 and a heat tracing pipeline 12;
the inlet end of a flue gas mixing tank 10 is connected with one end of a main pipe 6, a CEMS sampling probe 11 is embedded in the upper wall surface of the flue gas mixing tank 10, and one end of a heat tracing pipeline 12 is connected with the CEMS sampling probe 11.
It should be noted that, when sampling detection needs to be performed on flue gas, the flue gas is stored through the flue gas mixing tank 10, the flue gas is detected through the arranged CEMS sampling probe 11, and a detection signal is conveyed into the CEMS booth through the heat tracing pipeline 12.
In a specific implementation, the delivery assembly comprises: a connecting pipe 13, a venturi jet pump 14, an air inlet pipe 15, a mixed gas return pipe 16 and a second manual valve 17;
one end of a connecting pipe 13 is connected with the air outlet end of the flue gas mixing tank 10, the air suction end of the venturi jet pump 14 is connected with the other end of the connecting pipe 13, one end of an air inlet pipe 15 is connected with the air inlet end of the venturi jet pump 14, one end of a mixed gas return pipe 16 is connected with the air outlet end of the venturi jet pump 14, the other end of the mixed gas return pipe is connected with the denitration flue 1, and a second manual valve 17 is installed on the air inlet pipe 15.
It should be noted that, at first, the flue gas is connected to a compressed air pipe in the plant through an air inlet pipe 15, the compressed air enters the venturi jet pump 14 through the connecting pipe 13, negative pressure vacuum is formed by high-speed jet of the compressed air, the flue gas in the flue gas mixing tank 10 is drawn into the venturi jet pump 14 through the connecting pipe 13, and finally the flue gas is conveyed into the denitration flue 1 through the mixed gas return pipe 16 to return the flue gas.
In a specific implementation process, a first connecting flange 18 for connecting and sealing is arranged at the joint of the venturi jet pump 14 and the connecting pipe 13.
In the specific implementation process, a second connecting flange 19 for connecting and sealing is arranged at the joint of the venturi jet pump 14 and the air inlet pipe 15.
In the specific implementation, a third connecting flange 20 for connecting and sealing is arranged at the connection position of the venturi jet pump 14 and the mixed gas return pipe 16.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (6)
1. A flue gas sampling device of a denitration system of a thermal power plant comprises a denitration flue and is characterized in that the lower end of the denitration flue is connected with an air extraction sampling structure;
the air extraction sampling structure comprises: the device comprises six three-measuring-point probe rods, six preposed filter elements, six sampling pipes, six manual switching valves, a main pipe, a back-blowing electromagnetic valve, a sampling electromagnetic valve, a first manual valve, a flue gas mixing and sampling assembly and a conveying assembly;
six three-measuring-point probe rods are all embedded in the denitration flue, six prepositive filter elements are all installed at one ends of the six three-measuring-point probe rods, one ends of six sampling tubes are respectively connected with the lower ends of the six three-measuring-point probe rods, one side wall surface of a main pipe is connected with the lower ends of the six sampling tubes, a back-blowing electromagnetic valve is installed at one side of the main pipe, the sampling electromagnetic valve is installed at the other side of the main pipe, a first manual valve is installed on the main pipe and located at one side of the back-blowing electromagnetic valve, a flue gas mixing sampling assembly is connected with one end of the main pipe, one end of a conveying assembly is connected with the lower end of the flue gas mixing sampling assembly, and the other end of the conveying assembly is connected with the denitration flue.
2. The flue gas sampling device of a thermal power plant denitration system of claim 1, wherein the flue gas mixing and sampling assembly comprises: the device comprises a flue gas mixing tank, a CEMS sampling probe and a heat tracing pipeline;
the gas inlet end of the flue gas mixing tank is connected with one end of the main pipe, the CEMS sampling probe is embedded in the upper wall surface of the flue gas mixing tank, and one end of the heat tracing pipeline is connected with the CEMS sampling probe.
3. The flue gas sampling device of a thermal power plant denitration system of claim 2, wherein the conveying assembly comprises: the device comprises a connecting pipe, a Venturi jet pump, an air inlet pipe, a mixed gas return pipe and a second manual valve;
connecting pipe one end with the flue gas blending tank end of giving vent to anger is connected, venturi jet pump the end of breathing in with the connecting pipe other end is connected, intake pipe one end with venturi jet pump the end of breathing in is connected, gas mixture back flow one end with venturi jet pump is given vent to anger and is held and connect, and the other end with the denitration flue is connected, the manual valve of second install in on the intake pipe.
4. The flue gas sampling device of the denitration system of the thermal power plant as claimed in claim 3, wherein a first connecting flange for connecting sealing is arranged at the joint of the venturi jet pump and the connecting pipe.
5. The flue gas sampling device of the denitration system of the thermal power plant as claimed in claim 3, wherein a second connecting flange for connecting and sealing is arranged at the joint of the venturi jet pump and the air inlet pipe.
6. The flue gas sampling device of the denitration system of the thermal power plant as claimed in claim 3, wherein a third connecting flange for connecting and sealing is arranged at the connection of the venturi jet pump and the mixed gas return pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220797203.8U CN217466379U (en) | 2022-04-07 | 2022-04-07 | Flue gas sampling device of denitration system of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220797203.8U CN217466379U (en) | 2022-04-07 | 2022-04-07 | Flue gas sampling device of denitration system of thermal power plant |
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| Publication Number | Publication Date |
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| CN217466379U true CN217466379U (en) | 2022-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220797203.8U Active CN217466379U (en) | 2022-04-07 | 2022-04-07 | Flue gas sampling device of denitration system of thermal power plant |
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| CN (1) | CN217466379U (en) |
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- 2022-04-07 CN CN202220797203.8U patent/CN217466379U/en active Active
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