A measurement platform device based on a full-section grid multi-point

Abstract

This utility model discloses a measurement platform device based on a full-section grid multi-point measurement platform, relating to the field of denitrification measurement technology in thermal power plants. The utility model includes a flue, a dust filter, an electrical cabinet, and an air source filter box. The dust filter is fixedly inserted into the flue, and a symmetrically arranged secondary mixing pipe is fixedly connected to the lower end of the dust filter. An array of primary mixing pipes is fixedly connected to the end of the secondary mixing pipes furthest from the dust filter, and both ends of the primary mixing pipes have sampling air inlets for cooperative use. A backflush pipe is fixedly connected to one side of the upper end of the dust filter. This application overcomes the problems of poor representativeness, inaccurate measurement results, and large total boiler air volume and high current of the forced and induced draft fans caused by previous single-point measurement data. Furthermore, this application achieves multi-point online measurement, with good data representativeness and high measurement accuracy, effectively promoting energy conservation and consumption reduction in boilers.

Description

Technical Field

[0001] This utility model relates to the field of denitrification measurement technology in thermal power plants, specifically a measurement platform device based on a full-section grid multi-point. Background Technology

[0002] In coal-fired boilers, in order to ensure complete combustion of fuel, the actual amount of air supplied to the boiler must be greater than the theoretical amount of air required for combustion. However, if the oxygen content in the flue gas is too high or too low, the boiler efficiency will decrease, thereby increasing the energy consumption of the coal-fired power plant. Power plant exhaust emissions have strict upper limit standards for NOx content. Therefore, the measurement and monitoring of flue gas oxygen content, carbon monoxide, and NOx is very important.

[0003] Currently, the measurement of oxygen, carbon monoxide, and NOx in the front-end flue of denitrification devices in thermal power plants mainly relies on single-point measurement. Due to the large cross-sectional area of ​​the flue, the flue gas is uneven and the turbulence is severe. Single measurements are not representative, and the measurement data has a large deviation, resulting in an excessively large total boiler air volume and forced and induced draft fan current, which leads to energy waste.

[0004] To address the aforementioned problems, this application proposes a measurement platform device based on a full-section grid with multiple points to solve these problems. Utility Model Content

[0005] To address the problems of unrepresentativeness, large deviations in measurement data, and excessive boiler total air volume and forced draft fan current caused by traditional single measurements, this utility model aims to provide a measurement platform device based on a full-section grid with multiple points.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: A measurement platform device based on a full-section grid multi-point, including a flue, a dust filter, an electrical cabinet, and an air source filter box. The dust filter is fixedly inserted into the flue, and a symmetrically arranged secondary mixing pipe is fixedly connected to the lower end of the dust filter. An array of primary mixing pipes is fixedly connected to the end of the secondary mixing pipes away from the dust filter, and sampling air inlets are opened at both ends of the primary mixing pipes. A backflush pipe is fixedly connected to one side of the upper end of the dust filter, and an electric ball valve is fixedly installed at the end of the backflush pipe away from the dust filter. A matching air source pipe is fixedly connected between the electric ball valve and the air source filter box. The other side of the upper end of the dust filter... A three-stage mixing pipe is fixedly connected, and the ends of two three-stage mixing pipes are fixedly connected to a sample gas chamber for use. An oxygen meter, a carbon monoxide meter, and a NOx meter are fixedly installed inside the sample gas chamber. The sample gas chamber is fixedly installed on the flue, and a measuring instrument for use is fixedly installed at the top of the sample gas chamber. A sample gas return pipe is fixedly connected to the sample gas chamber, and the end of the sample gas return pipe is fixedly inserted into the flue. A matching electric butterfly valve and a jet pump are fixedly installed on the part of the sample gas return pipe between the sample gas chamber and the flue. A matching temperature sensor, a negative pressure sensor, and a flow rate sensor are fixedly installed on the sample gas return pipe. The temperature sensor, negative pressure sensor, flow rate sensor, electric ball valve, and measuring instruments are all electrically connected to the electrical cabinet.

[0007] Preferably, the sampling inlets are evenly distributed throughout the entire grid within the flue, and the sampling inlets are installed on the leeward side of the flue. A cleaning rod is movably engaged inside the sampling inlet.

[0008] Preferably, a double-layer filter element is fixedly installed inside the dust filter, and the pore sizes of the double-layer filter element are 5um and 1um, respectively.

[0009] Preferably, a second backflush pipe is fixedly connected to the sample gas return pipe, and a matching backflush ball valve is fixedly installed at the top of the second backflush pipe. A matching gas source pipe is fixedly installed between the backflush ball valve and the gas source filter box, and the backflush ball valve is electrically connected to the electrical cabinet.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] This application addresses the problems of poor representativeness, inaccurate measurement results, and large total boiler air volume and high current of forced and induced draft fans caused by previous single-point measurement data. Furthermore, this application realizes multi-point online measurement, with good representativeness and high measurement accuracy, which plays a positive role in promoting energy conservation and consumption reduction in boilers. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a front view of the overall structure of this utility model.

[0014] Figure 2 This is a side view of the overall structure of this utility model.

[0015] In the diagram: 1. Sampling inlet; 2. Dust removal rod; 3. Primary mixing pipe; 4. Secondary mixing pipe; 5. Dust filter; 6. Backflush pipe one; 7. Electric ball valve; 8. Sample gas chamber; 9. Measuring instrument; 10. Temperature sensor; 11. Negative pressure sensor; 12. Backflush pipe two; 13. Electric butterfly valve; 14. Flow rate sensor; 15. Jet pump; 16. Sample gas return pipe; 17. Electrical cabinet; 18. Gas source filter box; 19. Flue; 20. Tertiary mixing pipe; 21. Gas source connection pipe. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example: Figures 1-2As shown, this utility model provides a measurement platform device based on a full-section grid multi-point system, including a flue 19, a dust filter 5, an electrical cabinet 17, and an air source filter box 18. The dust filter 5 is fixedly inserted into the flue 19, and a symmetrically arranged secondary mixing pipe 4 is fixedly connected to the lower end of the dust filter 5. An array of primary mixing pipes 3 is fixedly connected to the end of the secondary mixing pipe 4 away from the dust filter 5, and sampling air inlets 1 are provided at both ends of the primary mixing pipe 3. A backflush pipe 6 is fixedly connected to one side of the upper end of the dust filter 5, and a sampling air inlet 1 is fixedly installed at the end of the backflush pipe 6 away from the dust filter 5. An electric ball valve 7 is fixedly connected to an air source pipe 21 for use with the air source filter box 18. A three-stage mixing pipe 20 is fixedly connected to the other side of the upper end of the dust filter 5, and the ends of the two three-stage mixing pipes 20 are fixedly connected to a sample gas chamber 8 for use. An oxygen meter, a carbon monoxide meter, and a NOx meter are fixedly installed in the inner cavity of the sample gas chamber 8. The sample gas chamber 8 is fixedly installed on the flue 19, and a measuring instrument 9 for use is fixedly installed on the top of the sample gas chamber 8. A sample gas return pipe 16 is fixedly connected to the sample gas chamber 8, and the end of the sample gas return pipe 16 is fixedly inserted into the flue 19. The sample gas return pipe 16 is located at the sample... An electric butterfly valve 13 and a jet pump 15 are fixedly installed between the gas chamber 8 and the flue 19. A temperature sensor 10, a negative pressure sensor 11, and a flow rate sensor 14 are fixedly installed on the sample gas return pipe 16. The temperature sensor 10, negative pressure sensor 11, flow rate sensor 14, electric ball valve 7, and measuring instrument 9 are all electrically connected to the electrical cabinet 17. The models of the temperature sensor 10, negative pressure sensor 11, and flow rate sensor 14 are Siemens FGT-PT1000, KSTAR K001, and ultrasonic AFE-01, respectively. A double-layer filter element is fixedly installed inside the dust filter 5. The pore sizes of the double-layer filter elements are 5µm and 1µm, respectively. The electrical cabinet 17 can set the backflushing time as needed, thereby controlling the electric ball valve 7 to achieve backflushing of the double-layer filter elements in the dust filter 5 according to the backflushing requirements. A backflushing pipe 2 12 is fixedly connected to the sample gas return pipe 16, and a matching backflushing ball valve is fixedly installed at the top of the backflushing pipe 2 12. A matching air source pipe 21 is fixedly installed between the backflushing ball valve and the air source filter box 18. The backflushing ball valve is electrically connected to the electrical cabinet 17. The electrical cabinet 17 can set the backflushing time as needed, thereby controlling the backflushing ball valve to achieve backflushing of the instrument head according to the backflushing requirements.

[0018] By adopting the above technical solution, during use, the flue gas in the flue 19 will enter the primary mixing pipe 3 through the sampling inlet 1, and then the flue gas will flow into the secondary mixing pipe 4. After being filtered by the dust filter 5, the flue gas will flow into the sample gas chamber 8 through the tertiary mixing pipe 20. At this time, the measuring instruments 9, oxygen meter, carbon monoxide meter and NOx meter will perform corresponding measurement operations. When the flue gas in the sample gas chamber 8 flows back into the flue 19 through the sample gas return pipe 16, the temperature sensor 10, negative pressure sensor 11 and flow rate sensor 14 will perform corresponding temperature, negative pressure and flow rate measurement operations. In addition, the measured data will be transmitted to the user end through the electrical cabinet 17.

[0019] The sampling inlet 1 is evenly distributed throughout the grid inside the flue 19, and the sampling inlet 1 is installed on the leeward side of the flue 19. A cleaning rod 2 is movably attached inside the sampling inlet 1.

[0020] By adopting the above technical solution, 8, 16 or 24 sampling points can be set according to measurement needs. Under the action of airflow, the cleaning rod 2 will swing with the wind, thereby achieving the function of cleaning the sampling air inlet 1.

[0021] Working principle: During use, the flue gas in the flue 19 will enter the primary mixing pipe 3 through the sampling inlet 1, and then the flue gas will flow into the secondary mixing pipe 4. After being filtered by the dust filter 5, the flue gas will flow into the sample gas chamber 8 through the tertiary mixing pipe 20. At this time, the measuring instruments 9, oxygen meter, carbon monoxide meter and NOx meter will perform corresponding measurement operations. When the flue gas in the sample gas chamber 8 flows back into the flue 19 through the sample gas return pipe 16, the temperature sensor 10, negative pressure sensor 11 and flow rate sensor 14 will perform corresponding temperature, negative pressure and flow rate measurement operations. In addition, the measured data will be transmitted to the user end through the electrical cabinet 17.

[0022] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A measurement platform device based on a full-section grid multi-point system, comprising a flue (19), a dust filter (5), an electrical cabinet (17), and an air source filter box (18), characterized in that: The dust filter (5) is fixedly inserted into the flue (19), and the lower end of the dust filter (5) is fixedly connected to a symmetrically arranged secondary mixing pipe (4). The end of the secondary mixing pipe (4) away from the dust filter (5) is fixedly connected to an array of primary mixing pipes (3), and both ends of the primary mixing pipe (3) are provided with sampling inlets (1) for use. The upper side of the dust filter (5) is fixedly connected to a backflush pipe (6), and the end of the backflush pipe (6) away from the dust filter (5) is fixedly installed with an electric ball valve (7). The electric ball valve (7) and the gas source filter box (18) are fixedly connected with a gas source pipe (21) for use. The other side of the upper end of the dust filter (5) is fixedly connected to a tertiary mixing pipe (20), and the ends of the two tertiary mixing pipes (20) are fixedly connected to a sample gas chamber (8) for use. An oxygen meter, a carbon monoxide meter, and a NOx meter are fixedly installed in the inner cavity of the sample gas chamber (8). The sample gas chamber (8) is fixedly installed on the flue (19), and a measuring instrument (9) for use is fixedly installed at the top of the sample gas chamber (8). A sample gas return pipe (16) is fixedly connected to the sample gas chamber (8), and the end of the sample gas return pipe (16) is fixedly inserted into the flue (19). An electric butterfly valve (13) and a jet pump (15) for use are fixedly installed at the part of the sample gas return pipe (16) between the sample gas chamber (8) and the flue (19). A temperature sensor (10), a negative pressure sensor (11), and a flow rate sensor (14) for use are fixedly installed on the sample gas return pipe (16). The temperature sensor (10), the negative pressure sensor (11), the flow rate sensor (14), the electric ball valve (7), and the measuring instrument (9) are all electrically connected to the electrical cabinet (17).

2. The measurement platform device based on a full-section grid multi-point as described in claim 1, characterized in that, The sampling inlet (1) is evenly distributed throughout the grid in the flue (19), and the sampling inlet (1) is installed on the leeward side of the flue (19).

3. The measurement platform device based on a full-section grid multi-point as described in claim 1, characterized in that, A cleaning rod (2) is movably connected inside the sampling air inlet (1).

4. The measurement platform device based on a full-section grid multi-point as described in claim 1, characterized in that, The dust filter (5) is fixedly installed with a double-layer filter element, and the pore sizes of the double-layer filter element are 5um and 1um, respectively.

5. The measurement platform device based on a full-section grid multi-point as described in claim 1, characterized in that, A backflush pipe (12) is fixedly connected to the sample gas return pipe (16), and a backflush ball valve is fixedly installed at the top of the backflush pipe (12). A gas source pipe (21) is fixedly installed between the backflush ball valve and the gas source filter box (18).

6. The measurement platform device based on a full-section grid multi-point as described in claim 5, characterized in that, The backflush ball valve is electrically connected to the electrical cabinet (17).

Images