NOx online analyzer

Abstract

The utility model belongs to the technical field of NOx analyzers, and discloses an online NOx analyzer which comprises a vacuum pump, the gas inlet end of the vacuum pump is communicated with an online NOx calibration detection pipeline, the gas inlet end of the online NOx calibration detection pipeline is communicated with a filtering condensation pipeline, the gas inlet end of the filtering condensation pipeline is communicated with a switching pipeline, and the switching pipeline is communicated with a gas outlet of the vacuum pump. The switching pipeline comprises an A-side switching box and a B-side switching box, and the air outlet end of the A-side switching box and the air outlet end of the B-side switching box are communicated with the air inlet end of the filtering condensation pipeline. According to the utility model, the detection result can be calibrated, when the NOx detection module is damaged, shutdown maintenance is not needed, the detection function is not influenced, and the use is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of NOx analyzers, and specifically relates to an on-line NOx analyzer. Background Art

[0002] At present, a large amount of flue gas is generated during the operation of thermal power plants. This flue gas contains a large number of pollutants, such as dust, nitrogen oxides, sulfur dioxide, etc. Among them, nitrogen oxides will cause certain pollution to the environment.

[0003] Therefore, it is necessary to measure the content of nitrogen oxides in the flue gas in real time to control the emissions of nitrogen oxides. There are various existing nitrogen oxide detection devices, among which the on-line real-time detection and analysis device is the most widely used. The existing NOx on-line analysis device is suitable for on-line sampling of the flue gas in the flue gas, and then detecting the NOx content in the extracted sample gas to obtain the concentration of NOx in the flue gas.

[0004] The existing NOx on-line analysis device can sample the flue gas and then perform on-line detection and analysis of the NOx concentration in the flue gas. However, the existing NOx on-line analysis device can only sample the flue gas and then perform on-line detection, and cannot calibrate the detection results. And when the NOx detection module fails, the entire NOx on-line analyzer will alarm and be damaged. Therefore, it is necessary to stop the machine for maintenance, which affects the detection function and reduces the use effect. Summary of the Utility Model

[0005] The main technical problem to be solved by the utility model is to provide an on-line NOx analyzer that can calibrate the detection results, and when the NOx detection module is damaged, there is no need to stop the machine for maintenance, which will not affect the detection function and is convenient to use.

[0006] To solve the above technical problems, the utility model provides the following technical solutions:

[0007] An on-line NOx analyzer includes a vacuum pump. The intake end of the vacuum pump is connected to an on-line NOx calibration and detection pipeline. The intake end of the on-line NOx calibration and detection pipeline is connected to a filtering and condensing pipeline. The intake end of the filtering and condensing pipeline is connected to a switching pipeline. The switching pipeline includes a side A switching box and a side B switching box. The outlet ends of the side A switching box and the side B switching box are respectively connected to the intake end of the filtering and condensing pipeline.

[0008] The following is a further optimization of the above technical solution by the utility model:

[0009] The A-side switching box and the B-side switching box are arranged on both sides of the flue gas pipeline to be detected. The A-side switching box and the B-side switching box work to suck the flue gas in the flue gas pipeline to be detected to obtain a flue gas detection sample. The air outlet end of the A-side switching box is connected in series with an A-side main valve. The air outlet end of the B-side switching box is connected in series with a B-side main valve.

[0010] Further optimization: The filtering and condensing pipeline includes a filtering and condensing main pipeline. The air outlet ends of the A-side main valve and the B-side main valve are respectively communicated with the air inlet end of the filtering and condensing main pipeline through corresponding gas transmission pipelines.

[0011] Further optimization: A filter, an electronic condenser and an electronic pressure gauge are sequentially communicated along the flowing direction of the flue gas on the filtering and condensing main pipeline. The filter is used to filter the flue gas flowing in the filtering and condensing main pipeline. The electronic condenser is used to cool down the filtered flue gas. The electronic pressure gauge is used to detect the pressure in the filtering and condensing main pipeline.

[0012] Further optimization: The NOx on-line calibration and detection pipeline includes a calibration and detection main pipeline. The air inlet end of the calibration and detection main pipeline is communicated with the air outlet end of the filtering and condensing main pipeline. The air outlet end of the calibration and detection main pipeline is communicated with a vacuum pump.

[0013] Further optimization: A main air inlet valve, a spare sensor air inlet valve, a spare NOx detection sensor, a spare sensor air outlet valve and a main NOx detection sensor are sequentially arranged along the flowing direction of the flue gas detection sample on the calibration and detection main pipeline.

[0014] Further optimization: A main air inlet branch pipeline is communicated between the main air inlet valve and the spare sensor air inlet valve on the calibration and detection main pipeline. The other end of the main air inlet branch pipeline is communicated with the air inlet end of the main NOx detection sensor.

[0015] Further optimization: A main sensor air inlet valve is connected in series on the main air inlet branch pipeline.

[0016] Further optimization: The air outlet end of the vacuum pump is communicated with the flue gas pipeline to be detected. The detected flue gas detection sample is discharged by the vacuum pump and then returned to the flue gas pipeline again.

[0017] Further optimization: It further includes an analyzer main board. The signal output end of the analyzer main board is respectively electrically connected with the control ends of the main air inlet valve, the spare sensor air inlet valve, the spare sensor air outlet valve and the main sensor air inlet valve. The output ends of the spare NOx detection sensor and the main NOx detection sensor are electrically connected with the signal input end of the analyzer main board.

[0018] The utility model adopts the above technical scheme, with ingenious conception and reasonable structure. The vacuum pump works to generate negative pressure suction and suck the flue gas detection samples collected in the switching box on side A and the switching box on side B through the calibration detection main pipe and the filtering and condensation main pipe. The filter is used to filter the flue gas flowing in the filtering and condensation main pipe; the electronic condenser is used to cool down the filtered flue gas, and the electronic pressure gauge is used to detect the pressure in the filtering and condensation main pipe.

[0019] In the utility model, a plurality of electromagnetic valves on the calibration detection main pipe can control the flow direction of the flue gas detection sample. During normal operation, the flue gas detection sample is transported to the main NOx detection sensor through the main intake branch pipe for detection, and a detection signal for the flue gas detection sample is obtained.

[0020] In the utility model, the standby NOx detection sensor and the main NOx detection sensor work synchronously to gradually detect the flue gas detection sample and obtain two detection signals; then the two detection signals are compared. When the comparison result is within the error range, it indicates that the detection result is accurate. Otherwise, it indicates that the detection result is inaccurate, and it is necessary to further check whether the main NOx detection sensor and the standby NOx detection sensor are damaged, thereby facilitating the troubleshooting of the two NOx detection sensors and improving the accuracy of the detection result and the use effect.

[0021] In the utility model, when the main sensor intake valve is damaged, the standby sensor intake valve and the standby sensor outlet valve are opened. At this time, the standby NOx detection sensor performs the detection operation, which will not affect the normal operation and is convenient to use, improving the use effect.

[0022] The following further illustrates the utility model with reference to the drawings and embodiments. Description of the Drawings

[0023] Figure 1 It is a structural block diagram of the overall structure of the embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of the overall structure in the embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of the back side of the hinged mounting plate in the embodiment of the utility model;

[0026] Figure 4 It is a schematic diagram of the inner side of the housing in the embodiment of the utility model.

[0027] In the figure: 1 - vacuum pump; 2 - switching box on the A side; 201 - main valve on the A side; 3 - switching box on the B side; 301 - main valve on the B side; 4 - main pipe for filtration and condensation; 401 - filter; 402 - electronic condenser; 403 - electronic pressure gauge; 5 - main pipe for calibration and detection; 501 - main intake valve; 502 - intake valve for standby sensor; 503 - standby NOx detection sensor; 504 - outlet valve for standby sensor; 505 - main NOx detection sensor; 506 - main intake branch pipe; 507 - intake valve for main sensor; 6 - housing; 601 - touch screen; 602 - hinged mounting plate; 603 - terminal block. Detailed implementation

[0028] As Figures 1-4 shown: An on-line NOx analyzer includes a vacuum pump 1. The intake end of the vacuum pump 1 is connected to an on-line NOx calibration and detection pipeline. The intake end of the on-line NOx calibration and detection pipeline is connected to a filtration and condensation pipeline. The intake end of the filtration and condensation pipeline is connected to a switching pipeline. The switching pipeline includes a switching box 2 on the A side and a switching box 3 on the B side. The outlet ends of the switching box 2 on the A side and the switching box 3 on the B side are respectively connected to the intake end of the filtration and condensation pipeline.

[0029] The switching box 2 on the A side and the switching box 3 on the B side are of the prior art and are arranged on both sides of the flue gas pipeline to be detected. Both the switching box 2 on the A side and the switching box 3 on the B side include a plurality of intake ports. The intake ports of the switching box 2 on the A side and the switching box 3 on the B side are symmetrically arranged respectively and are all connected to the flue gas pipeline to be detected.

[0030] The switching box 2 on the A side and the switching box 3 on the B side work to suck the flue gas in the flue gas pipeline to be detected to obtain a flue gas detection sample.

[0031] The outlet end of the switching box 2 on the A side is connected in series with a main valve 201 on the A side. The main valve 201 on the A side is used to control whether the switching box 2 on the A side outputs a flue gas detection sample.

[0032] The outlet end of the switching box on the B side is connected in series with a main valve 301 on the B side. The main valve 301 on the B side is used to control whether the switching box on the B side outputs a flue gas detection sample.

[0033] The filtration and condensation pipeline includes a main pipe 4 for filtration and condensation. Along the flow direction of the flue gas, a filter 401, an electronic condenser 402 and an electronic pressure gauge 403 are successively connected to the main pipe 4 for filtration and condensation.

[0034] The outlet ends of the main valve 201 on the A side and the main valve 301 on the B side are respectively connected to the intake end of the main pipe 4 for filtration and condensation through corresponding gas transmission pipelines.

[0035] The filter 401 is used to filter the flue gas flowing in the filter condensation main pipe 4; the electronic condenser 402 is used to cool down the filtered flue gas, and the electronic pressure gauge is used to detect the pressure in the filter condensation main pipe 4.

[0036] With such a design, when it is necessary to detect the flue gas detection sample collected in the A-side switching box 2, first open the A-side main valve 201 and close the B-side main valve 301. At this time, the flue gas detection sample collected in the A-side switching box 2 is transported to the filter 401 through the corresponding connecting pipeline.

[0037] At this time, the filter 401 is used to filter the flue gas detection sample; the filtered flue gas detection sample is transported to the electronic condenser 402; at this time, the electronic condenser 402 is used to cool down the flue gas detection sample, and the electronic pressure gauge is used to detect the pressure of the flue gas detection sample in the filter condensation main pipe 4.

[0038] When it is necessary to detect the flue gas detection sample collected in the B-side switching box 3, first open the B-side main valve 301 and close the A-side main valve 201. At this time, the flue gas detection sample collected in the B-side switching box 3 is transported to the filter 401 through the corresponding connecting pipeline; at this time, the filter 401 is used to filter the flue gas detection sample; the filter 401 is used to filter the filtered flue gas detection sample for cooling, and the electronic pressure gauge is used to detect the pressure of the flue gas detection sample in the filter condensation main pipe 4.

[0039] The NOx on-line calibration detection pipeline includes a calibration detection main pipe 5. The inlet end of the calibration detection main pipe 5 is communicated with the outlet end of the filter condensation main pipe 4, and the outlet end of the calibration detection main pipe 5 is communicated with the vacuum pump 1.

[0040] On the calibration detection main pipe 5, a main inlet valve 501, a spare sensor inlet valve 502, a spare NOx detection sensor 503, a spare sensor outlet valve 504, and a main NOx detection sensor 505 are sequentially arranged along the flow direction of the flue gas detection sample.

[0041] The main inlet valve 501 is used to control the on-off of the calibration detection main pipe 5; thereby controlling whether the flue gas detection sample in the filter condensation main pipe 4 enters the calibration detection main pipe 5.

[0042] The spare sensor inlet valve 502 is used to control the on-off of the inlet end of the spare NOx detection sensor 503, thereby controlling whether the flue gas detection sample in the calibration detection main pipe 5 enters the spare NOx detection sensor 503.

[0043] The spare NOx detection sensor 503 is in a standby state. During normal operation, the spare NOx detection sensor 503 is not activated; when it is necessary to calibrate the detection accuracy, the spare NOx detection sensor 503 is activated to detect the flue gas detection sample.

[0044] When the main NOx detection sensor 505 is damaged, the spare NOx detection sensor 503 is activated to detect the flue gas detection sample.

[0045] The spare sensor outlet valve 504 is used to control the flow direction of the flue gas in the calibration detection main pipe 5, preventing the flue gas in the calibration detection main pipe 5 from entering the spare NOx detection sensor 503 from the outlet end of the spare NOx detection sensor 503.

[0046] The main NOx detection sensor 505 is used to detect the flue gas detection sample in the calibration detection main pipe 5.

[0047] A main intake branch pipe 506 is connected between the main intake valve 501 and the spare sensor intake valve 502 on the calibration detection main pipe 5, and the other end of the main intake branch pipe 506 is connected to the intake end of the main NOx detection sensor.

[0048] A main sensor intake valve 507 is connected in series on the main intake branch pipe 506; the main sensor intake valve 507 is used to control the on-off of the main intake branch pipe 506.

[0049] With this design, in the normal working state, the spare NOx detection sensor 503 is not activated. At this time, both the spare sensor intake valve 502 and the spare sensor outlet valve 504 are in the closed state, and the main intake valve 501 and the main sensor intake valve 507 are open; the processed flue gas detection sample in the filter condensation main pipe 4 enters the main intake branch pipe 506 through the calibration detection main pipe 5, and then is diverted to the main NOx detection sensor 505. At this time, the main NOx detection sensor 505 is used to detect the flue gas detection sample to obtain the concentration of NOx in the flue gas detection sample. After the detection is completed, the flue gas detection sample is discharged by the vacuum pump 1.

[0050] When it is necessary to calibrate the detection accuracy of the main sensor intake valve 507, the spare sensor intake valve 502 and the spare sensor outlet valve 504 are opened. At this time, the flue gas detection sample in the calibration detection main pipe 5 first enters the spare NOx detection sensor to detect the flue gas detection sample, and a first detection signal is obtained.

[0051] Then, the flue gas detection sample in the calibration detection main pipe 5 enters the main NOx detection sensor 505 again and detects the flue gas detection sample to obtain a second detection signal.

[0052] Then, the first detection signal is compared with the second detection signal. When the comparison result is within the error range, it indicates that the detection result is accurate; otherwise, it indicates that the detection result is inaccurate, and it is necessary to further check whether the main NOx detection sensor 505 and the standby NOx detection sensor 503 are damaged.

[0053] When the main sensor intake valve 507 is damaged, the standby sensor intake valve 502 and the standby sensor outlet valve 504 are opened. At this time, the standby NOx detection sensor 503 performs the detection operation, which will not affect the normal operation and is convenient to use.

[0054] In this embodiment, the outlet end of the vacuum pump 1 is communicated with the flue gas pipeline to be detected. The flue gas detection sample after the detection is discharged by the vacuum pump 1 and then returned to the flue gas pipeline again to avoid the leakage of flue gas.

[0055] The NOx online analyzer further includes an analyzer main board. The signal output ends of the analyzer main board are electrically connected to the control ends of the total intake valve 501, the standby sensor intake valve 502, the standby sensor outlet valve 504, and the main sensor intake valve 507 respectively.

[0056] The control signals output by the analyzer main board are respectively used to control the total intake valve 501, the standby sensor intake valve 502, the standby sensor outlet valve 504, and the main sensor intake valve 507 to work, realizing opening or closing.

[0057] The output ends of the standby NOx detection sensor 503 and the main NOx detection sensor 505 are electrically connected to the signal input end of the analyzer main board, and the detection signals detected by the standby NOx detection sensor 503 and the main NOx detection sensor 505 are sent to the analyzer main board.

[0058] The NOx online analyzer also includes a housing 6. A touch screen 601 is arranged on the housing 6. The signal output end and the signal input end of the touch screen 601 are bidirectionally electrically connected to the signal input end and the signal output end of the analyzer main board. The touch screen 601 is used to display and control the control and detection parameters in the analyzer main board.

[0059] An articulated mounting plate 602 is movably arranged in the housing 6. One side edge of the articulated mounting plate 602 is articulated in the housing 6 through a hinge shaft, which is convenient for assembly and installation.

[0060] The standby NOx detection sensor 503 and the main NOx detection sensor 505 are respectively fixedly mounted on the front side of the articulated mounting plate 602.

[0061] The vacuum pump 1, the main intake valve 501, the standby sensor intake valve 502, the standby sensor outlet valve 504 and the primary sensor intake valve 507 are respectively fixedly installed on the back side of the hinged mounting plate 602.

[0062] The filter 401, the electronic condenser 402, and the electronic pressure gauge 403 are respectively installed on the inner side of the housing 6. A terminal block 603 is also installed on the inner side of the housing 6 and above the filter 401.

[0063] The analyzer main board is fixedly installed on the inner side of the housing 6 and above the terminal block 603.

[0064] During use, first determine whether it is necessary to detect the flue gas detection sample collected in the A-side switching box 2 or the B-side switching box 3. The following takes the detection of the flue gas detection sample collected in the A-side switching box 2 as an example to illustrate as follows: When it is necessary to detect the flue gas detection sample collected in the A-side switching box 2, first open the A-side main valve 201 and close the B-side main valve 301, then start the main intake valve 501 and the primary sensor intake valve 507, and close the standby sensor intake valve 502 and the standby sensor outlet valve 504; then start the vacuum pump 1.

[0065] At this time, the flue gas detection sample collected in the A-side switching box 2 is transported to the filter 401 through the corresponding connecting pipeline; the filter 401 is used to filter the flue gas detection sample; the filtered flue gas detection sample is transported to the electronic condenser 402 for cooling, and the electronic pressure gauge is used to detect the pressure of the flue gas detection sample in the filter and condensation main pipe 4.

[0066] The flue gas detection sample processed in the filter and condensation main pipe 4 enters the main intake branch pipe 506 through the calibration and detection main pipe 5, and then is diverted to the primary NOx detection sensor 505. At this time, the primary NOx detection sensor 505 is used to detect the flue gas detection sample to obtain the concentration of NOx in the flue gas detection sample. After the detection is completed, the flue gas detection sample is discharged by the vacuum pump 1 and returned to the flue gas pipeline.

[0067] The detection signal obtained by the primary NOx detection sensor 505 is sent to the analyzer main board and then displayed on the touch screen 601.

[0068] For those of ordinary skill in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, the changes, modifications, substitutions, and variations made to the embodiments still fall within the protection scope of the present invention.

Claims

1. An NOx on-line analyzer, comprising a vacuum pump (1), the intake end of the vacuum pump (1) being connected to an NOx on-line calibration and detection pipeline, the intake end of the NOx on-line calibration and detection pipeline being connected to a filtering and condensing pipeline, the intake end of the filtering and condensing pipeline being connected to a switching pipeline, the switching pipeline including a side A switching box (2) and a side B switching box (3), the outlet ends of the side A switching box (2) and the side B switching box (3) being respectively connected to the intake end of the filtering and condensing pipeline.

2. The NOx on-line analyzer according to claim 1, characterized in that: The side A switching box (2) and the side B switching box (3) are arranged on both sides of the flue gas pipeline to be detected, and the side A switching box (2) and the side B switching box (3) are operative to suck the flue gas in the flue gas pipeline to be detected to obtain a flue gas detection sample; a side A main valve (201) is connected in series at the outlet end of the side A switching box (2); a side B main valve (301) is connected in series at the outlet end of the side B switching box.

3. The NOx on-line analyzer according to claim 2, characterized in that: The filtering and condensing pipeline includes a filtering and condensing main pipe (4), and the outlet ends of the side A main valve (201) and the side B main valve (301) are respectively connected to the intake end of the filtering and condensing main pipe (4) through corresponding gas transmission pipelines.

4. An NOx online analyzer according to claim 3, characterized in that: On the filtering and condensing main pipe (4), a filter (401), an electronic condenser (402) and an electronic pressure gauge (403) are successively connected along the flow direction of the flue gas; the filter (401) is used for filtering the flue gas flowing in the filtering and condensing main pipe (4); the electronic condenser (402) is used for cooling down the filtered flue gas, and the electronic pressure gauge is used for detecting the pressure in the filtering and condensing main pipe (4).

5. The NOx on-line analyzer according to claim 4, characterized in that: The NOx on-line calibration and detection pipeline includes a calibration and detection main pipe (5), the intake end of the calibration and detection main pipe (5) being connected to the outlet end of the filtering and condensing main pipe (4), and the outlet end of the calibration and detection main pipe (5) being connected to the vacuum pump (1).

6. An NOx on-line analyzer according to claim 5, characterized in that: On the calibration and detection main pipe (5), a main intake valve (501), a spare sensor intake valve (502), a spare NOx detection sensor (503), a spare sensor outlet valve (504) and a main NOx detection sensor (505) are successively arranged along the flow direction of the flue gas detection sample.

7. An NOx online analyzer according to claim 6, characterized in that: A main intake branch pipe (506) is connected to the calibration and detection main pipe (5) between the main intake valve (501) and the spare sensor intake valve (502), and the other end of the main intake branch pipe (506) is connected to the intake end of the main NOx detection sensor.

8. An NOx on-line analyzer according to claim 7, characterized in that: A main sensor intake valve (507) is connected in series on the main intake branch pipe (506).

9. An NOx on-line analyzer according to claim 8, characterized in that: The outlet end of the vacuum pump (1) is connected to the flue gas pipeline to be detected, and the detected flue gas detection sample is discharged by the vacuum pump (1) and then returned to the flue gas pipeline again.

10. An NOx online analyzer according to claim 9, characterized in that: It further includes an analyzer main board, the signal output end of the analyzer main board being electrically connected to the control ends of the main intake valve (501), the spare sensor intake valve (502), the spare sensor outlet valve (504), and the main sensor intake valve (507); the output ends of the spare NOx detection sensor (503) and the main NOx detection sensor (505) are electrically connected to the signal input end of the analyzer main board.

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