Continuous monitoring device capable of prolonging response time

Abstract

The utility model provides a continuous monitoring device capable of prolonging response time. The continuous monitoring device comprises a sampling probe, an analysis instrument and a communication pipeline, the sampling probe is provided with a diluent gas inlet, a gas outlet and a gas suction port capable of being communicated with a flue gas pipeline. The analysis instrument is provided with a sample gas inlet. The communicating pipeline is respectively communicated with the gas outlet and the sample gas inlet; a sample gas pressure relief opening is formed in the end part, close to the sample gas inlet, of the communicating pipeline. According to the continuous monitoring device capable of increasing the response time, the sample gas pressure relief opening is formed in the end part, close to the analytical instrument, of the communicating pipeline, so that the flowing speed of sample gas in the communicating pipeline can be ensured, the time for the sample gas to pass through the communicating pipeline is shortened, the sample gas quickly enters the analytical instrument, and the response time is prolonged. The monitoring response time can be shortened, the structure is simple, and the practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of monitoring equipment, and in particular relates to a continuous monitoring device capable of improving response time. Background Art

[0002] Modern large-scale thermal power generation, chemical industry and other traditional energy enterprises are important industries supporting the stable and sustainable development of the national economy. Although these enterprises have taken effective environmental protection and emission reduction measures in the production process, they may still produce flue gas (waste gas). This requires a continuous flue gas emission monitoring system (CEMS), that is, all the equipment required to continuously monitor the emission concentration and emission of particulate matter and (or) gaseous pollutants from fixed pollution sources.

[0003] In the prior art, the continuous monitoring system for flue gas emissions has strict response time requirements (usually 200s). The dilution method gaseous pollutant measurement system usually includes a sampling probe and a gas analyzer. After the flue gas passes through the sampling probe, it is sent to the gas analyzer for measurement through the gas source gas pipeline. At the same time, in order to avoid clogging of the sampling probe, compressed air is used to perform reverse purge in the sampling probe. In order to avoid excessive gas flow rate entering the gas analyzer, a pressure relief port is usually set on the probe to give priority to depressurizing the gas entering the gas source gas pipeline. Although this method can ensure gas monitoring, it involves a certain length of the gas source gas pipeline, which will inevitably prolong the response time and may cause the corresponding time for gaseous pollutant monitoring to exceed the standard, and its practicality is poor. Utility Model Content

[0004] The embodiment of the utility model provides a continuous monitoring device capable of improving the response time, aiming to solve the problem of poor practicality of the existing dilution method gaseous pollutant measurement system due to the long response time.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a continuous monitoring device capable of improving the response time, including a sampling probe, an analysis instrument and a connecting pipeline;

[0006] The sampling probe has a dilution gas inlet for connecting to a dilution gas supply unit, a gas outlet, and an air inlet that can be communicated with a flue gas pipeline. The sampling probe is used to sample the flue gas and increase the flow rate of the sample gas;

[0007] The analytical instrument has a sample gas inlet;

[0008] The connecting pipeline is connected to the gas outlet and the sample gas inlet respectively, and a sample gas pressure relief port is provided at the end of the connecting pipeline close to the sample gas inlet.

[0009] In a possible implementation, the sampling probe includes a jet pump, and the jet pump has a nozzle for communicating with a dilution gas supply unit, a suction chamber, a suction pipe communicating with the suction chamber, a mixing pipe, and a spray pipe;

[0010] Wherein, the dilution gas inlet is located on the nozzle; the air inlet of the suction pipe is the air intake port; and the outlet of the injection pipe is the gas outlet.

[0011] In a possible implementation, the continuous monitoring device capable of improving response time further includes a calibration module, wherein the calibration module includes a solenoid valve, a standard gas container, and a delivery pipeline;

[0012] The solenoid valve has a main connection port and two secondary connection ports which can be respectively communicated with the main connection port, the main connection port of the solenoid valve is communicated with the air intake port, and one of the secondary connection ports of the solenoid valve is communicated with the smoke pipeline;

[0013] The standard gas container is used to store standard gas;

[0014] One end of the delivery pipeline is connected to the outlet of the standard gas container, and the other end is connected to another secondary connection port of the solenoid valve.

[0015] In a possible implementation, the solenoid valve is a two-position three-way solenoid valve.

[0016] In a possible implementation, a filter structure and a sonic hole are provided at intervals at the end of the flue gas pipeline close to the suction pipe, and the sonic hole is arranged close to the suction chamber.

[0017] In a possible implementation, a pressure gauge is provided on the suction pipe, and the pressure gauge is located between the sonic orifice and the suction chamber.

[0018] In a possible implementation, a throttle valve is provided on the sample gas pressure relief port.

[0019] In this implementation, by setting the sample gas pressure relief port on the end of the connecting pipeline close to the analytical instrument, the flow rate of the sample gas in the connecting pipeline can be guaranteed, thereby shortening the time for the sample gas to pass through the connecting pipeline, allowing the sample gas to quickly enter the analytical instrument, shortening the monitoring response time, and having a simple structure and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a continuous monitoring device capable of improving response time provided by an embodiment of the utility model;

[0021] Figure 2 for Figure 1A schematic diagram of the enlarged structure of the continuous monitoring device capable of improving the response time provided in the embodiment;

[0022] Description of reference numerals:

[0023] 10. Sampling probe; 11. Jet pump; 12. Nozzle; 13. Inhalation chamber; 14. Inhalation pipe; 15. Mixing pipe; 16. Injection pipe; 17. Pressure gauge; 18. Flue gas pipeline; 181. Filter structure; 182. Sonic orifice; 20. Analytical instrument; 30. Connecting pipeline; 31. Sample gas pressure relief port; 32. Throttle valve; 40. Calibration module; 41. Solenoid valve; 42. Standard gas container; 43. Delivery pipeline. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Please also read Figure 1 Now, the continuous monitoring device capable of improving the response time provided by the utility model is described. The continuous monitoring device capable of improving the response time comprises a sampling probe 10, an analysis instrument 20 and a connecting pipeline 30. The sampling probe 10 has a dilution gas inlet, a gas outlet and an air intake port that can be connected to the flue gas pipeline 18. The analysis instrument 20 has a sample gas inlet. The connecting pipeline 30 is connected to the gas outlet and the sample gas inlet respectively, and a sample gas pressure relief port 31 is provided at the end of the connecting pipeline 30 close to the sample gas inlet.

[0026] The continuous monitoring device that can improve the response time provided in this embodiment has a working principle that the sampling probe 10 is placed at a smoke generating location such as a chimney, and is connected to the analysis instrument 20 through a connecting pipeline 30, and the analysis instrument 20 is arranged in the CEMS station housing chassis, and the dilution gas inlet of the sampling probe 10 is connected to the dilution gas supply unit through a pipeline. Specifically, the dilution gas provided by the dilution gas supply unit enters the sampling probe 10 through the dilution gas inlet of the sampling probe 10, and at the same time, the smoke entering the air inlet is sucked in, so that the sample gas (in a certain proportion) after the dilution gas and the smoke are mixed flows through the connecting pipeline 30 toward the analysis instrument 20, and the sample gas enters the analysis instrument 20 through the sample gas inlet after the pressure is released through the sample gas pressure relief port 31. In this process, because the connecting pipeline 30 has a certain length and the sample gas flowing in the connecting pipeline 30 has a large velocity, the flow time in the connecting pipeline 30 can be shortened, thereby shortening the response time.

[0027] Compared with the prior art, the continuous monitoring device with improved response time provided in this embodiment can ensure the flow rate of the sample gas in the connecting pipeline 30 by setting the sample gas pressure relief port 31 at the end of the connecting pipeline 30 close to the analytical instrument 20, thereby shortening the time for the sample gas to pass through the connecting pipeline 30, and does not change the original dilution ratio of the dilution gas and the flue gas, so that the sample gas can quickly enter the analytical instrument 20, which can shorten the monitoring response time, has a simple structure, and is highly practical.

[0028] In some embodiments, the sampling probe 10 may be used as follows: Figure 1 See the structure shown. Figure 1 The sampling probe 10 includes a jet pump 11, which has a nozzle 12, a suction chamber 13, a suction pipe 14 connected to the suction chamber 13, a mixing pipe 15 and an injection pipe 16. The dilution gas inlet is located on the nozzle 12. The air inlet of the suction pipe 14 is the suction port. The outlet of the injection pipe 16 is the gas outlet.

[0029] Regarding the jet pump 11, the dilution gas as a high-pressure driving fluid passes through the nozzle 12 and enters into the mixing tube 15 and the injection pipe 16. In this process, kinetic energy is converted into dynamic pressure energy, thereby forming a low-pressure area in the suction chamber 13. The low-pressure area can inhale the flue gas corresponding to the suction pipe 14, and then the flue gas and the dilution gas are mixed in the mixing tube 15 and enter into the connecting pipeline 30 after passing through the injection pipe 16.

[0030] The jet pump 11 has a simple structure, no moving parts, is energy-saving, is not easy to be blocked, and can increase the flow rate of the sample gas, thereby ensuring a shortened response time to a certain extent.

[0031] It should be noted that the dilution gas supply unit is a prior art and will not be described in detail here.

[0032] In some embodiments, see Figure 1 The continuous monitoring device capable of improving the response time further comprises a calibration module 40, which comprises a solenoid valve 41, a standard gas container 42 and a delivery pipeline 43. The solenoid valve 41 has a main connection port and two sub-connection ports which can be respectively connected to the main connection port. The main connection port of the solenoid valve 41 is connected to the air inlet, and one of the sub-connection ports of the solenoid valve 41 is connected to the flue gas pipeline 18. The standard gas container 42 is capable of storing standard gas. One end of the delivery pipeline 43 is connected to the outlet of the standard gas container 42, and the other end is connected to another sub-connection port of the solenoid valve 41.

[0033] The calibration module 40 is mainly provided to facilitate the calibration of the monitoring of the analytical instrument 20. The standard gas container 42 can be a gas tank containing standard gas. When the analytical instrument 20 needs to be calibrated, the air inlet can be connected to the delivery pipeline 43 through the solenoid valve 41, so that the standard gas is sucked into the sampling probe 10 and monitored by the analytical instrument 20 to ensure the calibration of the analytical instrument 20.

[0034] It should be noted that a solenoid valve 41 and a pressure gauge may be provided on the delivery pipeline 43 so that the staff can check the gas delivery status in real time.

[0035] In this embodiment, a sonic hole is provided on the end of the delivery pipeline 43 close to the air intake pipe.

[0036] In some embodiments, the solenoid valve 41 may be used as follows: Figure 1 See the structure shown. Figure 1 The solenoid valve 41 is a two-position three-way solenoid valve, which can ensure that the flue gas and the standard gas enter the sampling probe 10 independently, and can prevent the flue gas from entering the delivery pipeline 43. At the same time, it can also prevent the flue gas from remaining and affecting the calibration effect. It has a simple structure, is easy to control, and is highly practical.

[0037] In some embodiments, the suction pipe 14 may be Figure 1 See the structure shown. Figure 1 A filter structure 181 and a sonic hole 182 are provided at intervals at the end of the flue gas pipeline 18 close to the suction pipe 14 , and the sonic hole 182 is provided close to the suction chamber 13 .

[0038] The filter structure 181 can ensure that the flue gas is filtered to avoid clogging. The principle of the sonic orifice 182 is that when there is a certain pressure difference before and after the orifice plate, the flue gas flows through the orifice plate. For a certain aperture, the flow rate through the orifice plate increases as the pressure difference increases. However, when the pressure difference exceeds a certain value (called the critical pressure difference), the flow rate of the fluid through the orifice plate shrinkage reaches the speed of sound. At this time, no matter how the pressure difference increases, as long as the pressure upstream of the orifice plate remains constant, the flow rate through the orifice plate will remain at a certain value and will no longer increase.

[0039] In this embodiment, the flue gas pipeline 18 may include a main pipeline and an auxiliary pipeline connecting the main pipeline and the solenoid valve 41. The two ends of the auxiliary pipeline are flange-connected to the main pipeline and the solenoid valve 41 respectively. The corresponding filter structure 181 and the sonic hole 182 are both located in the auxiliary pipeline, which is convenient for disassembly and assembly, and it is also convenient to replace the filter structure 181 and the sonic hole 182.

[0040] In some embodiments, the pressure gauge 17 may be used as follows: Figure 1 See the structure shown. Figure 1A pressure gauge 17 is provided on the suction pipe 14, and the pressure gauge 17 is located between the sonic hole 182 and the suction chamber 13. The setting of the pressure and can ensure that the air pressure in the suction pipe 14 is monitored to ensure that the staff can view the gas delivery status in real time.

[0041] In some embodiments, the sample gas pressure relief port 31 may be configured as follows: Figure 1 See the structure shown. Figure 1 A throttle valve 32 is provided on the sample gas pressure relief port 31 , and the throttle valve 32 can ensure that the opening degree can be adjusted, thereby accurately releasing pressure, and at the same time can ensure the flow rate of the sample gas entering the analytical instrument 20 .

[0042] As a specific implementation of the utility model embodiment:

[0043] Assuming that the length of the connecting pipeline 30 is 70 meters and the inner diameter is 6 mm, the volume of the connecting pipeline 30 is 1.978L.

[0044] Assuming that the sample gas flow rate flowing out of the gas outlet of the sampling probe 10 is 10 L / min, the time it takes to pass through the connecting pipeline 30 is 12 s.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A continuous monitoring device capable of improving response time, characterized in that: Including sampling probe, analysis instrument and connecting pipeline; The sampling probe has a dilution gas inlet, a gas outlet and an air intake port that can be connected to the flue gas pipeline; The analytical instrument has a sample gas inlet; The connecting pipeline is connected to the gas outlet and the sample gas inlet respectively, and a sample gas pressure relief port is provided at the end of the connecting pipeline close to the sample gas inlet.

2. The continuous monitoring device capable of improving response time as claimed in claim 1, characterized in that: The sampling probe comprises a jet pump, wherein the jet pump comprises a nozzle, a suction chamber, a suction pipe connected to the suction chamber, a mixing pipe and an injection pipe; Wherein, the dilution gas inlet is located on the nozzle; the air inlet of the suction pipe is the air intake port; and the outlet of the injection pipe is the gas outlet.

3. The continuous monitoring device capable of improving response time according to any one of claims 1 to 2, characterized in that: The continuous monitoring device capable of improving response time further comprises a calibration module, wherein the calibration module comprises a solenoid valve, a standard gas container and a delivery pipeline; The solenoid valve has a main connection port and two secondary connection ports which can be respectively communicated with the main connection port, the main connection port of the solenoid valve is communicated with the air intake port, and one of the secondary connection ports of the solenoid valve is communicated with the smoke pipeline; The standard gas container is used to store standard gas; One end of the delivery pipeline is connected to the outlet of the standard gas container, and the other end is connected to another secondary connection port of the solenoid valve.

4. The continuous monitoring device capable of improving response time as claimed in claim 3, characterized in that: The solenoid valve is a two-position three-way solenoid valve.

5. The continuous monitoring device capable of improving response time as claimed in claim 2, characterized in that: The end of the flue gas pipeline close to the suction pipe is provided with a filtering structure and a sonic hole at intervals, and the sonic hole is arranged close to the suction pipe.

6. The continuous monitoring device capable of improving response time as claimed in claim 5, characterized in that: The suction pipe is provided with a pressure gauge, and the pressure gauge is located between the sonic orifice and the suction chamber.

7. The continuous monitoring device capable of improving response time according to any one of claims 5 to 6, characterized in that: A throttle valve is arranged on the sample gas pressure relief port.

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