Ammonia escape measurement and online calibration system

Abstract

The utility model discloses an ammonia escape measurement and online calibration system, and particularly relates to the technical field of ammonia escape measurement, the ammonia escape measurement and online calibration system comprises a measurement cell for ammonia escape measurement, a gas inlet pipe fixedly penetrates through the top of the measurement cell, one end of the gas inlet pipe is fixedly provided with a uniform sampling device, and the uniform sampling device is communicated with the gas inlet pipe. A plurality of sampling ports are fixedly formed in the bottom end of the uniform sampling device and used for collecting flue gas in a denitration outlet flue, an exhaust pipe is fixedly arranged at the bottom end of the measuring cell, and stop valves are fixedly arranged on the exhaust pipe and the gas inlet pipe. According to the uniform sampling device, multi-layer flue gas samples in a denitration outlet flue are uniformly collected through different sampling port positions and different insertion depths, so that the obtained flue gas samples have higher representativeness, a closed space is formed by the measuring cell by utilizing the two stop valves, and the measurement accuracy is improved. Therefore, the influence of flue gas flow on flue gas sample ammonia escape calibration can be reduced, and the ammonia escape calibration effectiveness is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia escape measurement, in particular to an ammonia escape measurement and online calibration system. Background Art

[0002] At present, the main methods for monitoring the original flue gas containing ammonia escape components after flue gas denitrification are laser method and chemical method. Among them, the laser method is a method that uses laser technology to detect the amount of ammonia escape in flue gas. This technology determines the concentration of ammonia by analyzing the absorption of lasers of specific wavelengths by ammonia molecules when passing through the flue.

[0003] For example, the prior art publication number is CN212483534U, which is a continuous monitoring system for flue gas emissions. This utility model can realize the inspection of pipeline patency along the way and the rapid positioning of pipeline blockage, realize online compressed air backblowing and instrument calibration, and ensure the timeliness and accuracy of the denitrification system data, thereby improving the automatic commissioning rate of ammonia injection, realizing precise ammonia injection to reduce ammonia consumption and ammonia escape rate, and reducing operating risks and costs for enterprises.

[0004] The existing ammonia escape measurement device has the following defects: 1. The sampling point is relatively single, and only local flue gas can be sampled for measurement, and the measured ammonia escape concentration is not representative.

[0005] 2. Online calibration is not possible. For example, the in-situ ammonia escape device, whether it is a single-end reflection type or a double-end penetration type, is easily affected by environmental factors such as the flue gas flow rate in the flue during the calibration process, making it difficult to form a closed calibration chamber.

[0006] 3. Online calibration can be performed, but the measurement process consumes a lot of energy and is prone to environmental pollution. For example, in the extraction of heated ammonia escape devices, since the flue gas needs to be extracted from the flue to the measuring pool, in order to ensure that the flue gas temperature in the measuring pool is consistent with that in the flue, the flue gas needs to be heated all the time. This process consumes a lot of energy. At the same time, when the flue gas is extracted out of the flue, there is also the risk of flue gas leakage, causing environmental pollution.

[0007] 4. Lack of equipment for oil and water filtration of the purge air source of the ammonia escape device can easily lead to oil and water contamination of the air chamber, resulting in inaccurate measured ammonia escape concentration values, and also affecting the service life of the ammonia escape measurement equipment.

[0008] Based on this, the utility model provides an ammonia escape measurement and online calibration system which has high measurement and calibration effectiveness and can filter the purge gas source. Utility Model Content

[0009] In order to overcome the above-mentioned defects of the prior art, the utility model provides an ammonia escape measurement and online calibration system. The uniform sampling device uniformly collects multi-layer flue gas samples in the flue gas outlet through different sampling port positions and different insertion depths, so that the obtained flue gas samples are more representative. Two stop valves are used to form a closed space in the measuring pool, thereby reducing the influence of flue gas flow on the ammonia escape calibration of the flue gas sample, making the ammonia escape calibration more effective, so as to solve the problems arising from the above-mentioned background technology.

[0010] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an ammonia escape measurement and online calibration system, comprising a measuring cell for measuring ammonia escape, an air inlet pipe fixedly passing through the top of the measuring cell, a uniform sampling device fixedly provided at one end of the air inlet pipe, the uniform sampling device being connected to the air inlet pipe, a plurality of sampling ports fixedly provided at the bottom end of the uniform sampling device for collecting flue gas in a smoke exhaust outlet flue, an exhaust pipe fixedly provided at the bottom end of the measuring cell, stop valves fixedly provided on the exhaust pipe and the air inlet pipe for controlling the opening and closing of the air inlet pipe and the exhaust pipe, a laser gas analyzer for online calibration fixedly provided on one side of the measuring cell, one end of the laser gas analyzer passing through the measuring cell and extending into the measuring cell, the laser gas analyzer being connected to a gas source filter assembly.

[0011] In a preferred embodiment, the air source filter assembly includes an air storage tank and two purge control boxes. The two purge control boxes are both arranged above the air storage tank and are used to control the purge of the air source.

[0012] In a preferred embodiment, a drain outlet is fixedly penetrated through the bottom of the gas storage tank, the top of the drain outlet is connected to the inside of the gas storage tank, and a gas pipe is provided on the top of the gas storage tank for connecting to an on-site gas source.

[0013] In a preferred embodiment, a gas source pipeline is fixedly provided on the gas storage tank, and the gas source pipeline is connected to the interior of the gas storage tank. A first filter pressure reducing valve and a first oil mist separator are fixedly provided on the top of the gas source pipeline, which are used to filter the on-site gas source to prevent the oil and water in the on-site gas source from affecting the service life of the laser gas analyzer and the measuring cell.

[0014] In a preferred embodiment, a second filter pressure reducing valve, a second oil mist separator, a back-blowing solenoid valve, a first flow meter and a second flow meter are fixedly provided inside the two purge control boxes. The second filter pressure reducing valve and the second oil mist separator are respectively connected to the first flow meter and the second flow meter through a three-way pipe, and the first flow meter is connected to the back-blowing solenoid valve through a hose. The second filter pressure reducing valve and the second oil mist separator are used in cooperation to further separate oil and water from the on-site gas source, thereby further preventing oil and water from affecting the service life of the measuring cell and the laser gas analyzer.

[0015] In a preferred embodiment, the bottom end of the second flowmeter is connected to a purge air pipe 1, and the bottom end of the back-blow solenoid valve is connected to a purge air pipe 2. Both the purge air pipe 1 and the purge air pipe 2 are connected to a laser gas analyzer to provide a clean gas source for the laser gas analyzer.

[0016] In a preferred embodiment, two upper and lower junction boxes are provided between the two purge control boxes for wiring.

[0017] Technical effects and advantages of the utility model:

[0018] 1. The uniform sampling device in the utility model uniformly collects multi-layered flue gas samples in the flue gas outlet through different sampling port positions and different insertion depths, so that the obtained flue gas samples are more representative. The two stop valves are used to form a closed space in the measuring pool, thereby reducing the influence of flue gas flow on the ammonia escape calibration of the flue gas sample, making the ammonia escape calibration more effective.

[0019] 2. By utilizing the residual heat in the flue, the ammonia escape calibration can reach the temperature requirement without heating, thereby reducing the cost of use.

[0020] 3. Perform the first oil-water separation treatment on the on-site gas source through the gas storage tank, perform the second oil-water separation treatment on the gas source using the first filter pressure reducing valve and the first oil-water separator, and then use the second filter pressure reducing valve and the second oil-water separator to perform the third oil-water separation treatment on the gas source, so as to effectively reduce the impact of oil and water on the measuring cell, thereby extending the service life of the measuring cell and the laser gas analyzer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the measurement structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the interior of the measuring cell of the utility model;

[0023] Figure 3 This is a schematic diagram of the purge gas circuit of the utility model;

[0024] Figure 4 It is an enlarged view of the local structure of the utility model.

[0025] The accompanying drawings are marked as follows: 1, measuring pool; 2, air inlet pipe; 3, uniform sampling device; 4, sampling port; 5, exhaust pipe; 6, stop valve; 7, laser gas analyzer; 8, gas source filter assembly; 9, drain port; 10, gas transmission pipe; 11, gas source pipeline; 12, back-blowing solenoid valve; 13, first flow meter; 14, second flow meter; 15, three-way pipe; 16, hose; 17, purge air pipe 1; 18, purge air pipe 2; 19, junction box;

[0026] 801, gas storage tank; 802, purge control box; 803, first filter pressure reducing valve; 804, first oil mist separator; 805, second filter pressure reducing valve; 806, second oil mist separator. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Refer to the instruction manual Figure 1-4 The utility model provides an ammonia escape measurement and online calibration system, including a measuring cell 1 for measuring ammonia escape, an air inlet pipe 2 is fixedly penetrated on the top of the measuring cell 1, a uniform sampling device 3 is fixedly arranged at one end of the air inlet pipe 2, the uniform sampling device 3 is communicated with the air inlet pipe 2, a plurality of sampling ports 4 are fixedly arranged at the bottom end of the uniform sampling device 3 for collecting flue gas in the flue of the exhaust gas outlet, an exhaust pipe 5 is fixedly arranged at the bottom end of the measuring cell 1, a stop valve 6 is fixedly arranged on the exhaust pipe 5 and the air inlet pipe 2 for controlling the opening and closing of the air inlet pipe 2 and the exhaust pipe 5, a laser gas analyzer 7 for online calibration is fixedly arranged on one side of the measuring cell 1, one end of the laser gas analyzer 7 penetrates the measuring cell 1 and extends into the measuring cell 1.

[0029] When in use, the uniform sampling device 3 uniformly collects multi-layer flue gas samples in the denitrification outlet flue through different sampling port 4 positions and different insertion depths, so that the obtained flue gas samples have higher representativeness. When the flue gas sample flows into the measuring cell 1, it is calibrated using the laser gas analyzer 7. The laser gas analyzer 7 calculates the ammonia escape concentration value of the denitrification outlet by emitting-reflecting-receiving laser. During the calibration, the two stop valves 6 are closed, and the measuring cell 1 forms a closed space. The flue gas sample no longer flows. At the same time, the temperature of the flue gas sample can still maintain the flue gas temperature of the denitrification outlet flue for a short time. In such an environment, the standard gas introduced into the analyzer will not be drawn away by the flowing flue gas sample, and the calibrated ambient temperature can be kept consistent with the flue gas temperature in the denitrification outlet flue without passing through the heating pipe, thereby ensuring the effectiveness of the ammonia escape calibration of the flue gas sample.

[0030] Refer to the instruction manual Figure 1-4The laser gas analyzer 7 is connected to a gas source filter assembly 8, which includes a gas storage tank 801 and two purge control boxes 802. The two purge control boxes 802 are both arranged above the gas storage tank 801 to control the purge of the gas source. A drain port 9 is fixedly penetrated at the bottom of the gas storage tank 801. The top of the drain port 9 is connected to the inside of the gas storage tank 801. A gas pipe 10 is provided at the top of the gas storage tank 801 for connecting to the on-site gas source. Two upper and lower terminal boxes 19 are arranged between the two purge control boxes 802 for wiring.

[0031] Next, an air source pipeline 11 is fixedly provided on the air storage tank 801, and the air source pipeline 11 is connected to the inside of the air storage tank 801. A first filter pressure reducing valve 803 and a first oil mist separator 804 are fixedly provided on the top of the air source pipeline 11 for filtering the on-site air source. A second filter pressure reducing valve 805, a second oil mist separator 806, a back-blowing solenoid valve 12, a first flow meter 13 and a second flow meter 14 are fixedly provided inside the two purge control boxes 802. The second filter pressure reducing valve 805 and the second oil mist separator 806 are respectively connected to the first flow meter 13 and the second flow meter 14 through a three-way pipe 15. The first flow meter 13 is connected to the back-blowing solenoid valve 12 through a hose 16. The on-site air source is further separated from oil and water by using the second filter pressure reducing valve 805 and the second oil mist separator 806 to further prevent oil and water from affecting the service life of the measuring cell 1 and the laser gas analyzer 7.

[0032] The bottom end of the second flow meter 14 is connected to a purge air pipe 17, and the bottom end of the back-blowing solenoid valve 12 is connected to a purge air pipe 2 18. Both the purge air pipe 17 and the purge air pipe 2 18 are connected to the laser gas analyzer 7 to provide a clean gas source for the laser gas analyzer 7.

[0033] The on-site gas source flows into the gas tank 801 through the gas transmission pipe 10, and the first oil-water separation treatment is performed in the gas tank 801. The sealed larger oil and water are deposited at the bottom of the gas tank 801, and the sealed smaller gas source reaches the first filter pressure reducing valve 803 and the first oil-water separator along the gas source pipeline 11, and undergoes secondary oil-water separation treatment through the first oil-water separator. Then the gas source discharged from the first filter pressure reducing valve 803 is divided into two and enters two purge control boxes 802. The second filter pressure reducing valve 805 and the second oil-water separator in the two purge control boxes 802 perform the third oil-water separation treatment on the gas source. After the three-stage oil-water separation treatment, the on-site gas source effectively reduces the influence of oil and water on the measuring cell 1, thereby extending the service life of the measuring cell 1 and the laser gas analyzer 7. The gas source flowing out of the second filter pressure reducing valve 805 enters the first flow meter 13 and the second flow meter 14 respectively. The first flow meter 13 and the second flow meter 14 are used to control the flow rate of the manual back-blowing gas source, and the back-blowing solenoid valve 12 is used to control the flow rate of the automatic back-blowing gas source.

[0034] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An ammonia escape measurement and online calibration system, characterized in that: The invention comprises a measuring cell (1) for measuring ammonia escape, wherein an air intake pipe (2) is fixedly passed through the top of the measuring cell (1), a uniform sampling device (3) is fixedly provided at one end of the air intake pipe (2), the uniform sampling device (3) is connected to the air intake pipe (2), and a plurality of sampling ports (4) are fixedly provided at the bottom end of the uniform sampling device (3) for collecting flue gas in the flue gas outlet of the exhaust gas; An exhaust pipe (5) is fixedly provided at the bottom end of the measuring cell (1); a stop valve (6) is fixedly provided on the exhaust pipe (5) and the air inlet pipe (2) for controlling the opening and closing of the air inlet pipe (2) and the exhaust pipe (5); a laser gas analyzer (7) for online calibration is fixedly provided on one side of the measuring cell (1); one end of the laser gas analyzer (7) passes through the measuring cell (1) and extends into the measuring cell (1); and the laser gas analyzer (7) is connected to a gas source filter assembly (8).

2. The ammonia slip measurement and online calibration system according to claim 1, characterized in that: The air source filter assembly (8) comprises an air storage tank (801) and two purge control boxes (802), and the two purge control boxes (802) are both arranged above the air storage tank (801).

3. The ammonia slip measurement and online calibration system according to claim 2, characterized in that: A drainage port (9) is fixedly penetrated through the bottom of the gas storage tank (801), and the top of the drainage port (9) is connected to the inside of the gas storage tank (801). A gas pipe (10) is provided at the top of the gas storage tank (801) for connecting to an on-site gas source.

4. The ammonia slip measurement and online calibration system according to claim 2, characterized in that: The gas storage tank (801) is fixedly provided with a gas source pipeline (11), the gas source pipeline (11) is connected to the inside of the gas storage tank (801), and the top of the gas source pipeline (11) is fixedly provided with a first filtering pressure reducing valve (803) and a first oil mist separator (804) for filtering the on-site gas source.

5. The ammonia slip measurement and online calibration system according to claim 2, characterized in that: A second filter pressure reducing valve (805), a second oil mist separator (806), a back-blowing solenoid valve (12), a first flow meter (13) and a second flow meter (14) are fixedly installed inside the two purge control boxes (802). The second filter pressure reducing valve (805) and the second oil mist separator (806) are respectively connected to the first flow meter (13) and the second flow meter (14) through a three-way pipe (15), and the first flow meter (13) is connected to the back-blowing solenoid valve (12) through a hose (16).

6. The ammonia slip measurement and online calibration system according to claim 5, characterized in that: The bottom end of the second flow meter (14) is connected to a purge air pipe 1 (17), and the bottom end of the back-blowing solenoid valve (12) is connected to a purge air pipe 2 (18). Both the purge air pipe 1 (17) and the purge air pipe 2 (18) are connected to a laser gas analyzer (7).

7. The ammonia slip measurement and online calibration system according to claim 2, characterized in that: Two upper and lower junction boxes (19) are arranged between the two purge control boxes (802).

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