Flue gas sampling probe filter element automatic switching device

Abstract

The utility model discloses a flue gas sampling probe filter element automatic switching device which is composed of a first probe filter element, a second probe filter element, a sampling probe and an air extractor, the first probe filter element and the second probe filter element are arranged at the front end of the sampling probe, the rear end of the first probe filter element is communicated with the air extractor through a first channel, and the rear end of the second probe filter element is communicated with the air extractor through a second channel. The rear end of the probe filter element II is communicated with an air extractor through a passage II; the sampling probe is mounted in a near-wall area of the water cooling wall; the on-off of the first path and the on-off of the second path can be controlled respectively. The other end of the air extractor is connected with the compressed air source; the device further comprises a flue gas analyzer, and the sampling probe is connected with the flue gas analyzer. According to the utility model, the electromagnetic valve I and the electromagnetic valve II are automatically switched to realize the switching of the probe filter element I or the probe filter element II, so that the flue gas analyzer can automatically switch the probe filter element I or the probe filter element II through which flue gas sampling passes without manual operation, and the replacement period of the probe filter element I or the probe filter element II is prolonged.

Description

Technical Field

[0001] The utility model relates to an automatic switching device for a filter element of a flue gas sampling probe. Background Technique

[0002] During the production of thermal power plants, coal is used as the main raw material. However, due to the high content of nitrogen oxides in coal, a large amount of flue gas is generated synchronously during continuous production. There are many pollutants in these flue gases. If directly discharged without treatment, it will exacerbate air pollution. The "Emission Standards of Air Pollutants for Thermal Power Plants" clearly requires that the mass concentration of NOx emissions in the flue gas of coal-fired power plants should not be higher than 100 mg / m3, and in some areas, the mass concentration of NOx emissions should not be higher than 50 mg / m3. At present, selective catalytic reduction technology (SCR) is mostly used in power plants to control NOx emissions. By injecting NH3 to react with NOx to generate non-polluting N2 and H2O. To ensure a high denitration efficiency, sufficient ammonia needs to be injected to fully react with NOx. Excessive escaped NH3 will react with SO3 and H2O in the flue gas at low temperatures to generate NH4HSO4. NH4HSO4 has high viscosity and medium acidity, which can adhere to the catalyst surface, causing catalyst poisoning and reducing the denitration efficiency. At the same time, it will also cause blockage and corrosion of the air preheater, further causing the flue gas temperature to rise, increasing the load of the induced draft fan and even causing unnecessary unit shutdowns, seriously affecting the safe and stable operation of the denitration unit. To protect the environment and reduce operating costs, it is extremely important to have a high measurement accuracy of ammonia escape during the operation of thermal power units on the premise of ensuring that NOx emissions meet the standards.

[0003] 1. The flue gas discharged from thermal power units contains a large amount of fine dust. The filter element at the front end of the sampling probe continuously accumulates dust and particulate matter during operation, and is gradually contaminated and blocked, making the probe unable to normally extract flue gas, affecting the normal detection of the flue gas quality by the equipment, and thus resulting in abnormal monitoring data.

[0004] 2. To ensure the normal operation of the probe, the filter element itself, as a consumable, needs to be replaced regularly according to the usage situation. The replacement cycle is generally 3 - 6 months. Frequent replacement of the filter element not only increases the workload of personnel, but also requires operation training for personnel, and there is a risk of incorrect operation, resulting in system failures.

[0005] To solve these problems, the present utility model is hereby proposed. Content of the Utility Model

[0006] The purpose of the present utility model is to provide an automatic switching device for a filter element of a flue gas sampling probe.

[0007] One object of the present utility model can be achieved through the following technical solutions:

[0008] An automatic switching device for the filter element of a flue gas sampling probe consists of a first probe filter element, a second probe filter element, a sampling probe, and an air extraction device. The front end of the sampling probe is provided with the first probe filter element and the second probe filter element. The rear end of the first probe filter element is connected to the air extraction device through a first passage, and the rear end of the second probe filter element is connected to the air extraction device through a second passage.

[0009] Preferably, the sampling probe is installed in the near-wall area of the water wall.

[0010] Furthermore, the on-off of the first passage and the second passage can be controlled separately.

[0011] Preferably, it further includes a compressed air source, and the other end of the air extraction device is connected to the compressed air source.

[0012] Furthermore, it further includes a flue gas analyzer, and the sampling probe is connected to the flue gas analyzer.

[0013] Preferably, it further includes a sample gas pipeline, and the sampling probe is connected to the flue gas analyzer through the sample gas pipeline.

[0014] Furthermore, it further includes a first solenoid valve, and the first solenoid valve is arranged on the first passage.

[0015] Preferably, it further includes a second solenoid valve, and the second solenoid valve is arranged on the second passage.

[0016] Furthermore, it further includes a sample gas pipeline drain, and the sampling probe is connected to the sample gas pipeline drain, which is used to drain the remaining sample gas in the sampling probe.

[0017] Beneficial technical effects:

[0018] In the present utility model, the switching between the first probe filter element and the second probe filter element is realized through the automatic switching of the first solenoid valve and the second solenoid valve, enabling the flue gas analyzer to automatically switch between the first probe filter element and the second probe filter element through which the flue gas sampling passes, without manual operation, and extending the replacement cycle of the first probe filter element or the second probe filter element. Description of the Drawings

[0019] The following further describes the present utility model in conjunction with the drawings.

[0020] Figure 1 It is a schematic structural diagram of the automatic switching device for the filter element of the flue gas sampling probe of the present utility model.

[0021] In the figure: 1. First probe filter element; 2. Second probe filter element; 3. Sampling probe; 4. Second probe filter element; 5. First probe filter element; 6. Air extraction device; 7. First probe filter element; 8. Second probe filter element; 9. Compressed air source; 10. Flue gas analyzer. Specific Embodiments

[0022] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present utility model.

[0023] As Figure 1 shown, an automatic switching device for a flue gas sampling probe filter element is composed of a probe filter element 1, a probe filter element 2, a sampling probe 3, and an air extraction device 6. The sampling probe 3 is installed in the near-wall area of the water-cooled wall. The front end of the sampling probe 3 is provided with the probe filter element 1 and the probe filter element 2. The rear end of the probe filter element 1 is connected to the air extraction device 6 through a passage 1, and the rear end of the probe filter element 2 is connected to the air extraction device 6 through a passage 2. The on-off of the passage 1 and the passage 2 can be controlled respectively, so as to realize the automatic switching device of the probe filter element during flue gas sampling. It further includes a compressed air source 9, and the other end of the air extraction device 6 is connected to the compressed air source 9.

[0024] It further includes a flue gas analyzer 10. The sampling probe 3 is connected to the flue gas analyzer 10. It further includes a sample gas pipeline 8. The sampling probe 3 is connected to the flue gas analyzer 10 through the sample gas pipeline 8.

[0025] It further includes a solenoid valve 1 4 and a solenoid valve 2 5. The solenoid valve 1 4 is arranged on the passage 1, and the solenoid valve 2 5 is arranged on the passage 2.

[0026] It further includes a sample gas pipeline drain 7. The sampling probe 3 is connected to the sample gas pipeline drain 7. The sample gas pipeline drain 7 is used for draining the remaining sample gas in the sampling probe 3.

[0027] During use, the air extraction device 6 works. Under the extraction power of the air extraction device 6, the flue gas enters the sampling probe 3 through the probe filter element 1 or the probe filter element 2. The sampling branch can be selected through the on-off of the solenoid valve 1 4 or the solenoid valve 2 5. The sampled flue gas passes through the sampling pipeline 8. A part enters the flue gas analyzer 10, and the remaining sample gas is discharged through the sample gas drain 7.

[0028] An automatic switching device for a flue gas sampling probe filter element of the present utility model ensures the accuracy and stability of the analyzer measurement accuracy and the high-precision measurement of the ammonia escape amount of the equipment by setting the probe filter element 1 and the probe filter element 2 through which the sample gas sampling passes, so as to maintain the sample gas flow rate.

[0029] An automatic switching device for a flue gas sampling probe filter element of the present utility model enables the flue gas analyzer 10 to automatically switch the probe filter element 1 or the probe filter element 2 through which the flue gas sampling passes by setting the automatic switching of the solenoid valve 1 4 and the solenoid valve 2 5, without manual operation, and extends the replacement cycle of the probe filter element 1 or the probe filter element 2.

[0030] Automatic filter element switching device for flue gas sampling probe. When the detected flue gas extraction volume decreases or the monitored data is abnormal, by timely switching the filter element through which the flue gas is sampled, the influence of filter element blockage on sampling is avoided, the sample gas flow is ensured, and thus the accuracy and stability of the analyzer measurement accuracy are improved.

[0031] Automatic filter element switching device for flue gas sampling probe. The system automatically detects the sample gas flow and monitored data of the sample gas evacuation. When an abnormality occurs, the system will automatically switch the solenoid valve and automatically switch the filter element through which the flue gas is sampled, without the need for manual operation, extending the filter element replacement cycle and reducing the maintenance cost and the risk of misoperation.

[0032] The above shows and describes the basic principles, main features and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0033] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic switching device for the filter element of a flue gas sampling probe, characterized in that, It is composed of a probe filter element 1 (1), a probe filter element 2 (2), a sampling probe (3), and an air extraction device (6). The front end of the sampling probe (3) is provided with the probe filter element 1 (1) and the probe filter element 2 (2). The rear end of the probe filter element 1 (1) is connected to the air extraction device (6) through a passage 1, and the rear end of the probe filter element 2 (2) is connected to the air extraction device (6) through a passage 2.

2. The automatic switching device for the filter element of the flue gas sampling probe according to claim 1, characterized in that, The sampling probe (3) is installed in the near-wall area of the water-cooled wall.

3. The automatic switching device for the filter element of the flue gas sampling probe according to claim 2, wherein, The on-off of the passage 1 and the passage 2 can be controlled separately.

4. The automatic switching device for the filter element of the flue gas sampling probe according to claim 3, wherein, It further includes a compressed air source (9), and the other end of the air extraction device (6) is connected to the compressed air source (9).

5. The automatic switching device for the filter element of the flue gas sampling probe according to claim 3, wherein, It further includes a flue gas analyzer (10), and the sampling probe (3) is connected to the flue gas analyzer (10).

6. The automatic switching device for the filter element of the flue gas sampling probe according to claim 5, characterized in that, It further includes a sample gas pipeline (8), and the sampling probe (3) is connected to the flue gas analyzer (10) through the sample gas pipeline (8).

7. The automatic switching device for the filter element of the flue gas sampling probe according to claim 2, wherein, It further includes a solenoid valve 1 (4), and the solenoid valve 1 (4) is arranged on the passage 1.

8. The automatic switching device for the filter element of the flue gas sampling probe according to claim 1, wherein It further includes a solenoid valve 2 (5), and the solenoid valve 2 (5) is arranged on the passage 2.

9. The automatic switching device for the filter element of the flue gas sampling probe according to claim 6, characterized in that, It further includes a sample gas pipeline drain (7), and the sampling probe (3) is connected to the sample gas pipeline drain (7). The sample gas pipeline drain (7) is used for draining the remaining sample gas in the sampling probe (3).

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