A flue gas online monitoring system

Abstract

The present invention discloses an online flue gas monitoring system, which relates to the technical field of flue gas monitoring, and includes a high temperature box and a bottom cabinet; a collection part, which is connected to the high temperature box and is used to collect flue gas under a specific environment, and the collection part includes a probe fixedly installed on the outside of the high temperature box, and the probe includes a shell, and a conduit is fixedly connected to the shell, and a sampling tube is fixedly connected to the conduit, and a dustproof component matched with the conduit is installed in the probe. The advantages are: the online flue gas monitoring system uses a backwashing method to flush and clean the entire gas path, making the cleaning of the gas path more convenient, and at the same time, it can reduce the content of dust entering the gas path during the inhalation detection process, ensure the single inhalation volume, reduce the frequency of recoil breathing, and improve the inhalation detection efficiency. In addition, the flue gas can be rotated to increase the contact area and contact time between the flue gas and the heating cylinder, thereby improving the flue gas heating efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of smoke monitoring, and in particular to an online smoke monitoring system. Background Art

[0002] The flue gas monitoring system is an equipment system used to monitor and analyze gases emitted in industrial processes in real time. The system is widely used in the field of environmental protection to ensure that companies comply with environmental regulations and reduce pollution to the environment.

[0003] For example, announcement number CN117470596B discloses an online flue gas monitoring device and an online flue gas monitoring method, which include a sampling pipe for communicating with a flue, the sampling pipe having a sampling tube and a plurality of liquid collecting tubes at different heights, the lower end of the sampling tube extending into the sampling pipe, the sampling tube being communicated with the sampling pipe, the diameter of the liquid collecting tube being larger than the diameter of the sampling tube, the upper end of the sampling tube extending into the liquid collecting tube at the lowest position, the sampling tube being communicated with the liquid collecting tube, and the upper end of the sampling tube having a higher tube opening height than the bottom surface of the inner cavity of the liquid collecting tube.

[0004] The flue gas online monitoring device divides the existing pipeline into a liquid collecting tube and a drainage tube with different diameters, and the drainage tube is inserted into the liquid collecting tube so that the height of the upper end of the drainage tube is at the bottom of the inner cavity of the liquid collecting tube. In this way, when the flue gas is blown into the liquid collecting tube from the sampling tube, the pressure at the upper end of the sampling tube will be greater than the pressure at the bottom of the inner cavity of the liquid collecting tube, which is conducive to the water condensed on the inner wall of the sampling tube to gather on the bottom of the inner cavity of the liquid collecting tube under the pressure of the flue gas, and will not contact with the subsequent flue gas. In this way, the flue gas can better and fully contact with the inner wall of the drainage tube to cool down, condense the water in the flue gas, achieve gas-water separation, and better maintain the accuracy of the online monitoring data.

[0005] During the actual use of the flue gas online monitoring device, since the flue gas contains a large amount of dust, a simple filter is used for filtering, and the filtering effect is poor. As the flue gas is inhaled, the amount of dust accumulated on the filter increases, which will cause the filter pass rate to decrease, thereby affecting the air intake efficiency. In addition, the dust adsorbed on the filter cannot be effectively cleaned and needs to be manually cleaned regularly, which is inconvenient to use.

[0006] Therefore, a new type of flue gas online monitoring system can be used to solve the shortcomings of the existing technology. Summary of the invention

[0007] The purpose of the present invention is to solve the problem in the prior art that dust affects air intake and dust cleaning is inconvenient, and to propose a flue gas online monitoring system.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A flue gas online monitoring system, comprising a high temperature box and a bottom cabinet; a collection part, the collection part is connected to the high temperature box and is used to collect flue gas under a specific environment, the collection part comprises a probe fixedly installed outside the high temperature box, the probe comprises a shell, a conduit is fixedly connected to the shell, a sampling tube is fixedly connected to the conduit, and a dustproof component matched with the conduit is installed in the probe;

[0010] A heating unit is installed in the high temperature box and is used to heat the flue gas so that the flue gas reaches the monitoring temperature. The heating unit includes a heating block and a heating pipe fixedly installed inside the high temperature box. A temperature control component matching the heating block and the heating pipe is installed in the high temperature box.

[0011] The air suction part is installed in the high temperature box and the bottom cabinet, and is used to absorb the flue gas for monitoring. The air suction part includes a gas chamber fixedly installed inside the high temperature box, a drainage pump and an electric ball valve. A calibration solenoid valve, a sampling solenoid valve, a back-blowing solenoid valve and a one-way throttle valve are fixedly installed in the bottom cabinet, and a filter pressure reducing valve is fixedly installed outside the bottom cabinet. An air guide component is installed between the high temperature box and the bottom cabinet;

[0012] The detection unit is installed inside the base cabinet and is used to detect the content of specific substances in the collected flue gas. The detection unit includes a light source, a spectrometer and an HMI human-machine interface fixedly installed inside the base cabinet. The HMI human-machine interface is connected to the light source and the spectrometer through an I / O interface module.

[0013] Preferably, the dustproof component includes a cyclone component fixedly installed inside the shell, the cyclone component includes an air inlet and an air outlet, and both ends of the cyclone component are respectively fixedly connected with a primary dustproof mechanism and a secondary dustproof mechanism.

[0014] Preferably, the cyclone assembly includes a bracket fixedly mounted inside the outer shell, a cyclone blade is fixedly mounted on the bracket, a rotating shaft is rotatably mounted through the middle of the cyclone blade, a dual-axis motor is fixedly mounted on the bracket, a first driving end of the dual-axis motor is fixedly connected to the rotating shaft, a heating cylinder is fixedly mounted on the second driving end of the dual-axis motor, and a mixing mechanism is mounted on the heating cylinder.

[0015] Preferably, the mixing mechanism comprises an annular air chamber fixedly mounted on the heating cylinder, the annular air chamber is fixedly connected to an annular air pipe, the annular air pipe is fixedly connected to a plurality of air delivery pipes, an inner cover and an outer cover are fixedly mounted on the annular air chamber, and each of the air delivery pipes penetrates the outer cover and extends between the outer cover and the inner cover;

[0016] The heating cylinder is fixedly mounted with an air suction fan blade, which is located in the inner cover. The annular air chamber is fixedly connected with a plurality of air inlet nozzles, each of which is fixedly connected with an air delivery duct, each of which is located in the inner cover. The inner cover and the outer cover are mechanically rotatably connected with the bracket, and the cyclone blades are located between the outer cover and the inner cover.

[0017] Preferably, the air delivery duct is designed to be arc-shaped, and a filter is fixedly installed in the air delivery duct, and the inner walls of the inner cover and the outer cover are both designed to be smooth.

[0018] Preferably, the first-level dust prevention mechanism includes a plurality of electrostatic plates fixedly mounted inside the outer shell, a square drain cover is fixedly mounted on the plurality of electrostatic plates, the square drain cover is connected to the air inlet of the cyclone assembly, an ash discharge hole is opened at the bottom of the outer shell, and a collection box matching the ash discharge hole is fixedly mounted at the bottom of the outer shell.

[0019] Preferably, the secondary dust prevention mechanism includes an air duct, an air passage and a ventilation pipe fixedly mounted on the outer shell, the air duct passes through the outer shell, and is connected with the heating pipe, the air duct, the air passage and the ventilation pipe are connected, the ventilation pipe is fixedly connected to the bracket, the air duct is fixedly connected with a filter cover, and a recoil structure is installed in the filter cover.

[0020] Preferably, the recoil structure includes a baffle rotatably mounted inside the filter cover, the baffle adopts a semicircular arc design, a jet cover is fixedly mounted on the baffle, a gas cylinder is fixedly mounted on the baffle, a piston is slidably mounted in the gas cylinder, a spring is fixedly mounted between the piston and the gas cylinder, a push rod is fixedly mounted on the side of the piston away from the spring, a ball is rollingly mounted on the end of the push rod away from the piston, an annular groove is opened on the filter cover, a guide rail matching the ball is fixedly mounted in the annular groove, the rotating shaft and the baffle are fixedly connected, the rotating shaft passes through the filter cover, and the gas cylinder and the jet cover are connected by a pipe fitting.

[0021] Preferably, the temperature control assembly includes a thermostat fixedly installed inside the high-temperature box, and a temperature limit switch matched with the thermostat is fixedly installed outside the high-temperature box.

[0022] Preferably, the gas guide assembly includes a pipe 1 fixedly connected to the calibration solenoid valve, the pipe 1 extends out of the bottom cabinet, and the calibration solenoid valve is connected to the gas chamber through a pipe 1;

[0023] The filter pressure reducing valve is fixedly connected with a pipeline 2, the pipeline 2 is connected with a one-way throttle valve, the one-way throttle valve is connected with a sampling electromagnetic valve through a pipeline 3, the pipeline 2 is fixedly connected with a pipeline 4, the pipeline 4 is connected with a back-blowing electromagnetic valve, the sampling electromagnetic valve is connected with a heating block through a pipe 2, the heating block is connected with a drainage pump through a pipe 3, the drainage pump is fixedly connected with an exhaust pipe, the exhaust pipe passes through and extends out of the high temperature box;

[0024] The heating pipe is connected to the electric ball valve, the back-blowing solenoid valve is connected to the heating pipe through a pipe four, the electric ball valve is fixedly connected to the gas chamber with a pipe five, and the gas chamber is fixedly connected with zirconium oxide through a pipe five.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. During the process of smoke detection and inhalation, the flue gas online monitoring system uses electrostatic plates to initially absorb the dust in the inhaled smoke, reducing most of the dust in the smoke, and then collects and cleans the absorbed dust through a collection box, reducing the dust content entering the filter cover and reducing the probability of filter cover clogging.

[0027] 2. During the process of smoke detection and inhalation, the flue gas online monitoring system uses a cyclone component to drive the smoke to rotate, causing the smoke to generate centrifugal force. The centrifugal force causes the dust to stick to the inner cover and the inner wall of the outer cover, further reducing the amount of dust entering the filter cover. At the same time, the smoke rotates in the inner cover, which can increase the contact area between the smoke and the heating tube, thereby improving the heating efficiency of the smoke.

[0028] 3. During the smoke detection and suction process, the smoke online monitoring system uses a baffle to divide the filter cover into two parts. The two parts operate intermittently, and then cooperate with the air cylinder and the jet cover to backflush the filter cover during the suction process, reducing the amount of dust attached to the filter cover during the suction process, thereby ensuring the ventilation efficiency of the filter cover and improving the suction efficiency. In addition, the backflush solenoid valve is used to backflush the entire gas path, which has high cleaning efficiency and convenient operation.

[0029] To sum up, the flue gas online monitoring system adopts the backwashing method to flush and clean the entire gas path, making the cleaning of the gas path more convenient. At the same time, during the inhalation detection process, it can reduce the content of dust entering the gas path, ensure the single inhalation volume, reduce the frequency of recoil breathing, and improve the inhalation detection efficiency. In addition, it can also make the flue gas rotate, increase the contact area and contact time between the flue gas and the heating cylinder, thereby improving the flue gas heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 This is a structural schematic diagram of a flue gas online monitoring system proposed by the present invention;

[0032] Figure 2 for Figure 1 Detailed schematic diagram of the high temperature box, base cabinet and its internal structure;

[0033] Figure 3 for Figure 2 Detailed schematic diagram of the structure after being rotated to a certain angle;

[0034] Figure 4 for Figure 3 A schematic detailed view of the plan structure along one of the angles;

[0035] Figure 5 for Figure 3 A schematic diagram of the enlarged structure of the middle probe;

[0036] Figure 6 for Figure 5 A schematic detailed view of the plan structure along one of the angles;

[0037] Figure 7 for Figure 6 Detailed schematic diagram of the three-dimensional structure along the AA section;

[0038] Figure 8 for Figure 7 A schematic detailed view of the plan structure along one of the angles;

[0039] Fig. 9 for Figure 7 A schematic detailed diagram of the enlarged structure after removing the housing, the conduit and the sampling tube;

[0040] Fig.10 for Fig. 9 Detailed schematic diagram of the structure after removing the electrostatic plate and rotating it to a certain angle;

[0041] Fig.11 for Fig.10 A schematic detailed diagram of the planar structure along one of the angles after removing the square drain cover;

[0042] Fig.12 for Fig. 9 Detailed schematic diagram of the structure of the mesocyclone assembly;

[0043] Fig.13 for Fig.12 Detailed schematic diagram of the structure after removing the outer cover;

[0044] Fig.14 for Fig.13 Detailed schematic diagram of the structure after removing the bracket and inner cover;

[0045] Fig.15for Fig.14 Detailed schematic diagram of the structure after the shaft and cyclone blades are removed and rotated to a certain angle;

[0046] Fig.16 for Fig.15 A detailed schematic diagram of the structure after removing the gas pipe and gas channel and rotating it at a certain angle;

[0047] Fig.17 for Fig.10 A detailed diagram of the enlarged structure of the central air duct, the air pipe and the cyclone blades;

[0048] Fig.18 for Fig.17 A schematic detailed view of the plan structure along one of the angles;

[0049] Fig.19 for Fig.18 Detailed schematic diagram of the three-dimensional structure along the BB section;

[0050] Fig. 20 for Fig.19 A detailed diagram of the enlarged structure of the middle baffle, the filter cover and the jet cover rotated at a certain angle;

[0051] Fig.21 for Fig.19 An enlarged schematic diagram of the structure of the gas cylinder and the guide rail;

[0052] Fig. 22 for Fig.21 Detailed diagram of the exploded structure of the middle gas cylinder;

[0053] Fig.23 It is a detailed schematic diagram of the control system of the device;

[0054] Fig.24 Schematic diagram of the gas path of this device.

[0055] In the figure: 1 high temperature box, 2 base cabinet, 3 filter pressure reducing valve, 4 probe, 5 temperature limit switch, 6 temperature controller, 7 gas chamber, 8 heating block, 9 drainage pump, 10 zirconium oxide, 11 HMI human-machine interface, 12 I / O interface module, 13 light source, 14 spectrometer, 15 calibration solenoid valve, 16 sampling solenoid valve, 17 back-blowing solenoid valve, 18 one-way throttle valve, 19 electric ball valve, 20 housing, 21 catheter, 22 sampling tube, 23 collection box, 24 cyclone assembly, 25 square leak cover, 26 electrostatic plate, 27 air guide tube, 28 air duct, 29 air duct, 30 outer cover, 31 bracket, 32 air supply pipe, 33 rotating shaft, 34 cyclone blade, 35 inner cover, 36 annular air chamber, 37 annular air pipe, 38 heating cylinder, 39 suction fan blade, 40 air supply duct, 41 air inlet nozzle, 42 baffle, 43 filter cover, 44 jet cover, 45 air cylinder, 46 push rod, 47 guide rail, 48 spring, 49 piston. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] Example 1: Reference Figure 1-Figure 2 , Figure 4-Figure 22 A flue gas online monitoring system includes a high-temperature box 1 and a bottom cabinet 2; a collection part, which is connected to the high-temperature box 1 and is used to collect flue gas under a specific environment. The collection part includes a probe 4 fixedly installed on the outside of the high-temperature box 1, and the probe 4 includes a shell 20, and the shell 20 is fixedly connected with a conduit 21, and the conduit 21 is fixedly connected with a sampling tube 22. A dustproof component matching the conduit 21 is installed in the probe 4.

[0058] The probe 4 is a sampling device with electric heating and heating function, which can heat itself and implement temperature control. The device is suitable for continuous collection of gas samples after the combustion process. It is typically used for collecting dusty and water-rich samples in power plant flues, cement production processes, etc. The length of the sampling tube 22 is 0.5 meters by default.

[0059] The dustproof component includes a cyclone component 24 fixedly installed inside the housing 20, the cyclone component 24 includes an air inlet and an air outlet, and both ends of the cyclone component 24 are respectively fixedly connected to a primary dustproof mechanism and a secondary dustproof mechanism;

[0060] The cyclone assembly 24 includes a bracket 31 fixedly mounted inside the housing 20, a cyclone blade 34 is fixedly mounted on the bracket 31, a rotating shaft 33 is rotatably mounted through the middle of the cyclone blade 34, a double-shaft motor is fixedly mounted on the bracket 31, a first driving end of the double-shaft motor is fixedly connected to the rotating shaft 33, a heating cylinder 38 is fixedly mounted on the second driving end of the double-shaft motor, and a mixing mechanism is mounted on the heating cylinder 38;

[0061] When the smoke passes through the cyclone blades 34, the smoke will rotate under the action of the cyclone blades 34 and spray out to both sides, so that the smoke can rotate into the secondary dust prevention mechanism, reduce the smoke passage resistance, and make the smoke flow smoother.

[0062] The mixing mechanism includes an annular air chamber 36 fixedly mounted on a heating cylinder 38, an annular air pipe 37 fixedly connected to the annular air chamber 36, a plurality of air delivery pipes 32 fixedly connected to the annular air pipe 37, an inner cover 35 and an outer cover 30 fixedly mounted on the annular air chamber 36, and each air delivery pipe 32 penetrates the outer cover 30 and extends between the outer cover 30 and the inner cover 35;

[0063] An air suction fan blade 39 is fixedly installed on the heating cylinder 38, and the air suction fan blade 39 is located in the inner cover 35. A plurality of air inlet nozzles 41 are fixedly connected to the annular air chamber 36, and each air inlet nozzle 41 is fixedly connected to an air supply duct 40, and each air supply duct 40 is located in the inner cover 35. The inner cover 35 and the outer cover 30 are mechanically rotatably connected to the bracket 31 (which is the existing rotatable connection technology, which can not only rotate with each other but also ensure the sealing of the connection), and the cyclone blade 34 is located between the outer cover 30 and the inner cover 35.

[0064] The suction blades 39 rotate under the drive of the dual-axis motor, and the smoke in the sampling tube 22 is sucked into the inner cover 35. At the same time, the annular air chamber 36 also rotates, and the outer cover 30 also rotates with the annular air chamber 36, so that the smoke rotates in the inner cover 35 to generate centrifugal force. The dust is thrown onto the inner wall of the inner cover 35 under the action of the centrifugal force, thereby achieving the purpose of dust cleaning. At the same time, the rotation of the smoke can also increase the contact time and contact area between the heating tube 38 and the smoke, thereby improving the heating efficiency of the smoke.

[0065] After the smoke enters the inner cover 35, it will be sucked into the annular air chamber 36 by the air inlet nozzle 41 through the air supply duct 40 (due to the small diameter of the air inlet nozzle 41, the particle size of the dust in the smoke is small, which plays a certain dust prevention role), and then the smoke in the annular air chamber 36 will enter the annular air pipe 37, and then enter the space between the inner cover 35 and the outer cover 30 through the air supply pipe 32, and then the smoke will rotate in the space. Since the inner diameter of the inner cover 35 is smaller than the inner diameter of the outer cover 30, the centrifugal force generated at the same rotation speed is different, and the outer cover 30 can adsorb lighter dust. Then the smoke will be discharged from the outer cover 30 through the cyclone blades 34.

[0066] The air duct 40 adopts an arc-shaped design, and a filter is fixedly installed in the air duct 40. The inner walls of the inner cover 35 and the outer cover 30 are both smooth. The purpose of the arc-shaped design of the air duct 40 is to tilt the air inlet of the air duct 40, so that air can be automatically inhaled when the air duct 40 rotates, which plays a certain mixing and stirring role, making the inhaled flue gas more uniform after dust removal, thereby improving the accuracy of flue gas monitoring.

[0067] The primary dust prevention mechanism includes a plurality of electrostatic plates 26 fixedly installed inside the outer shell 20, on which a square leakage cover 25 is fixedly installed, the square leakage cover 25 is connected to the air inlet of the cyclone assembly 24, an ash discharge hole is opened at the bottom of the outer shell 20, and a collection box 23 matching the ash discharge hole is fixedly installed at the bottom of the outer shell 20.

[0068] The flue gas entering the outer shell 20 from the sampling tube 22 will pass through multiple electrostatic plates 26, which will adsorb dust in the flue gas, and then enter the cyclone assembly 24 through the square leak cover 25. The dust adsorbed by the electrostatic plates 26 will adhere to the electrostatic plates 26, and then the electrostatic plates 26 will be powered off. At this time, the dust adsorbed on the electrostatic plates 26 will enter the collection box 23 through the ash discharge holes. The collection box 23 and the outer shell 20 are fixedly connected by a snap-fit. When cleaning, you only need to push the collection box 23 out of the outer shell 20, which is convenient to operate.

[0069] The secondary dust prevention mechanism includes an air duct 27, an air passage 28 and a ventilation pipe 29 fixedly mounted on the outer shell 20. The air duct 27 passes through the outer shell 20, and is connected to the heating pipe. The air duct 27, the air passage 28 and the ventilation pipe 29 are connected. The ventilation pipe 29 is fixedly connected to the bracket 31. A filter cover 43 is fixedly connected to the air duct 28, and a recoil structure is installed in the filter cover 43.

[0070] After the smoke enters the ventilation pipe 29, it will be filtered through the filter cover 43 and then enter the ventilation duct 28. Since the inner diameter of the ventilation duct 28 is larger than the inner diameter of the filter cover 43, the smoke will be depressurized and decelerated after entering the ventilation duct 28 from the filter cover 43, thereby reducing the flow rate of the smoke and providing sufficient time for the subsequent heating of the smoke, thereby making the smoke heating more thorough.

[0071] Since filter holes are provided on the side of the filter cover 43, when smoke is ejected from the outer cover 30, it will directly contact the end of the filter cover 43, and no filter holes are provided at the end of the filter cover 43, which will affect the passage of smoke. The cyclone blades 34 can make the smoke ejected from the outer cover 30 diffuse to both sides, and then enter the filter cover 43 from the filter holes on the side of the filter cover 43, thereby reducing the contact amount between the smoke and the end of the filter cover 43 and ensuring ventilation efficiency.

[0072] The recoil structure includes a baffle 42 rotatably mounted inside a filter cover 43, the baffle 42 is designed in a semicircular arc shape, a jet cover 44 is fixedly mounted on the baffle 42, a gas cylinder 45 is fixedly mounted on the baffle 42, a piston 49 is slidably mounted in the gas cylinder 45, a spring 48 is fixedly mounted between the piston 49 and the gas cylinder 45, a push rod 46 is fixedly mounted on the side of the piston 49 away from the spring 48, a ball is rollingly mounted on the end of the push rod 46 away from the piston 49, an annular groove is provided on the filter cover 43, a guide rail 47 matching the ball is fixedly mounted in the annular groove, the rotating shaft 33 and the baffle 42 are fixedly connected, the rotating shaft 33 passes through the filter cover 43, and the gas cylinder 45 and the jet cover 44 are connected through a pipe fitting.

[0073] As the rotating shaft 33 rotates, the baffle 42 is driven to rotate, and the rotation of the baffle 42 will intermittently block half of the filter cover 43, and each time air is inhaled, it enters from the other side of the baffle 42, so that intermittent air intake operation can be performed to reduce the probability of blockage;

[0074] As the baffle 42 rotates, the air cylinder 45 fixedly mounted on the baffle 42 also rotates. The rotation of the air cylinder 45 drives the internal piston 49 and the push rod 46 to rotate. Under the action of the guide rail 47, the push rod 46 drives the piston 49 to move in the air cylinder 45, and cooperates with the spring 48 to achieve reciprocating operation, thereby producing a blowing effect. In conjunction with the jet cover 44, a reverse jet operation can be performed on the filter cover 43 to blow off the dust adhering to the filter cover 43, which is convenient for the next air intake and ensures the air intake volume.

[0075] Embodiment 2: The technical solution of this embodiment is different from that of Embodiment 1 in that: Figure 1-Figure 4 , Fig.23 The heating unit is installed in the high temperature box 1 and is used to heat the flue gas so that the flue gas reaches the monitoring temperature. The heating unit includes a heating block 8 and a heating pipe fixedly installed inside the high temperature box 1. A temperature control component matching the heating block 8 and the heating pipe is installed in the high temperature box 1. The heating pipe adopts a constant power, high temperature and corrosion resistant heating pipe with a temperature control of 120°C.

[0076] The temperature control component includes a thermostat 6 fixedly installed inside the high temperature box 1, and a temperature limit switch 5 matched with the thermostat 6 is fixedly installed outside the high temperature box 1. The thermostat 6 is used to control the temperature inside the high temperature box 1. Its working principle is to dissipate heat for the high temperature box 1 to reduce the temperature inside the high temperature box 1. In combination with the use of the heating block 8, the temperature inside the high temperature box 1 can be kept constant.

[0077] Embodiment 3: The technical solution of this embodiment is different from that of Embodiment 2 in that: Figure 2-Figure 4 , Fig.24 The air suction part is installed in the high temperature box 1 and the bottom cabinet 2, and is used to absorb the flue gas for monitoring. The air suction part includes a gas chamber 7, a drainage pump 9 and an electric ball valve 19 fixedly installed inside the high temperature box 1. A calibration solenoid valve 15, a sampling solenoid valve 16, a back-blowing solenoid valve 17 and a one-way throttle valve 18 are fixedly installed in the bottom cabinet 2, and a filter pressure reducing valve 3 is fixedly installed outside the bottom cabinet 2. An air guide component is installed between the high temperature box 1 and the bottom cabinet 2.

[0078] The gas guide assembly includes a pipe 1 fixedly connected to the calibration solenoid valve 15, the pipe 1 extends out of the bottom cabinet 2, and the calibration solenoid valve 15 is connected to the gas chamber 7 through a pipe 1;

[0079] The filter pressure reducing valve 3 is fixedly connected with a pipeline 2, which is connected to the one-way throttle valve 18, and the one-way throttle valve 18 is connected to the sampling electromagnetic valve 16 through a pipeline 3. The pipeline 2 is fixedly connected with a pipeline 4, which is connected to the back-blowing electromagnetic valve 17. The sampling electromagnetic valve 16 is connected to the heating block 8 through the pipe 2, and the heating block 8 is connected to the drainage pump 9 through the pipe 3. The drainage pump 9 is fixedly connected with an exhaust pipe, and the exhaust pipe passes through and extends out of the high-temperature box 1;

[0080] Reference Figure 4 , Fig.24 After the system enters the measurement state, the electric ball valve 19 switches to the sampling gas path. Under the action of the drainage pump 9, the measured gas enters the gas chamber 7 through the probe 4, the heating pipe, and the electric ball valve 19. The detection unit includes a light source 13, a spectrometer 14, and an HMI human-machine interface 11 fixedly installed inside the base cabinet 2. The gas is analyzed using DOAS technology to measure the concentration of each component and finally emptied.

[0081] The heating pipe is connected with the electric ball valve 19, the back-blowing solenoid valve 17 is connected with the heating pipe through pipe four, the electric ball valve 19 is fixedly connected with the gas chamber 7 through pipe five, and zirconium oxide 10 is fixedly connected with the gas chamber 7 through pipe five (zirconium oxide 10 is used to catalyze other substances in the flue gas to reduce the influence of other substances on the monitored substances).

[0082] By default, the system will enter the calibration state at regular intervals for automatic zeroing. At this time, the electric ball valve 19 switches to the calibration gas circuit, the calibration solenoid valve 15 opens, and under the action of the drainage pump 9, the ambient air passes through the calibration solenoid valve 15 and enters the gas chamber 7 to purge the residual measured gas in the gas chamber 7. After purging, each component is zeroed once.

[0083] By default, the system will enter the backflush state at regular intervals to backflush the probe 4. At this time, the electric ball valve 19 switches to the backflush gas path, the backflush solenoid valve 17 opens, and the system automatically controls the backflush solenoid valve 17 to open or close in a pulsed manner to achieve purging of the probe 4 gas path.

[0084] The detection unit is installed inside the base cabinet 2 and is used to detect the content of specific substances in the collected flue gas. The detection unit includes a light source 13, a spectrometer 14 and an HMI human-machine interface 11 fixedly installed inside the base cabinet 2. The HMI human-machine interface 11 is connected to the light source 13 and the spectrometer 14 through an I / O interface module 12.

[0085] The HMI human-machine interface 11 monitors by controlling the spectrometer 14 and the light source 13 . The HMI human-machine interface 11 can also control the operation of the calibration solenoid valve 15 , the sampling solenoid valve 16 , the back-blowing solenoid valve 17 and the electric ball valve 19 .

[0086] The control system of this device is shown in the figure Fig.23 The HMI human-machine interface 11 is connected to the calibration solenoid valve 15, the sampling solenoid valve 16 and the back-blowing solenoid valve 17 through a relay. The heating pipe is heated by a heating pipe heater. A probe heater is installed in the heating cylinder 38 in the probe 4. The thermostat 6 controls the probe heater and the heating pipe heater through a solid-state relay (PT100 is a temperature sensor that can transmit the temperature to the thermostat 6 in real time, and is used to sense the temperature of the heating pipe, the probe 4 and the I / O interface module 12).

[0087] The specific operation steps of this device are as follows:

[0088] Monitoring: After the system enters the measurement state, the electric ball valve 19 switches to the sampling gas path. Under the action of the drainage pump 9, the measured gas enters the gas chamber 7 through the probe 4, the heating pipe, and the electric ball valve 19. The detection part includes a light source 13, a spectrometer 14 and an HMI human-machine interface 11 fixedly installed inside the base cabinet 2. The gas is analyzed using DOAS technology to measure the concentration of each component and finally emptied.

[0089] By default, the system will enter the calibration state at regular intervals for automatic zeroing. At this time, the electric ball valve 19 switches to the calibration gas circuit, the calibration solenoid valve 15 opens, and under the action of the drainage pump 9, the ambient air passes through the calibration solenoid valve 15 and enters the gas chamber 7 to purge the residual measured gas in the gas chamber 7. After purging, each component is zeroed once.

[0090] By default, the system will enter the backflush state at regular intervals to backflush the probe 4. At this time, the electric ball valve 19 switches to the backflush gas path, the backflush solenoid valve 17 opens, and the system automatically controls the backflush solenoid valve 17 to open or close in a pulsed manner to achieve purging of the probe 4 gas path.

[0091] Inhalation sampling: The flue gas entering the housing 20 from the sampling tube 22 will pass through multiple electrostatic plates 26, which will adsorb the dust in the flue gas, and then enter the cyclone assembly 24 through the square leak cover 25. The dust adsorbed by the electrostatic plates 26 will adhere to the electrostatic plates 26, and then the electrostatic plates 26 will be powered off. At this time, the dust adsorbed on the electrostatic plates 26 will enter the collection box 23 through the ash discharge hole. The collection box 23 and the housing 20 are fixedly connected by a snap-fit, and when cleaning, you only need to push the collection box 23 out of the housing 20.

[0092] The suction blades 39 rotate under the drive of the dual-axis motor, and the smoke in the sampling tube 22 is sucked into the inner cover 35. At the same time, the annular air chamber 36 also rotates, and the outer cover 30 also rotates with the annular air chamber 36, so that the smoke rotates in the inner cover 35, generating centrifugal force. The dust will be thrown onto the inner wall of the inner cover 35 under the action of the centrifugal force, thereby achieving the purpose of dust cleaning.

[0093] After the smoke enters the inner cover 35, it will be sucked into the annular air chamber 36 by the air inlet nozzle 41 through the air supply duct 40 (due to the small diameter of the air inlet nozzle 41, the particle size of the dust in the smoke is small, which plays a certain dust prevention role), and then the smoke in the annular air chamber 36 will enter the annular air pipe 37, and then enter the space between the inner cover 35 and the outer cover 30 through the air supply pipe 32, and then the smoke will rotate in the space. Since the inner diameter of the inner cover 35 is smaller than the inner diameter of the outer cover 30, the centrifugal force generated at the same rotation speed is different, and the outer cover 30 can adsorb lighter dust. Then the smoke will be discharged from the outer cover 30 through the cyclone blades 34.

[0094] After the smoke enters the ventilation pipe 29, it will be filtered by the filter cover 43 and then enter the ventilation passage 28. Since the inner diameter of the ventilation passage 28 is larger than the inner diameter of the filter cover 43, the smoke will be depressurized and decelerated after entering the ventilation passage 28 from the filter cover 43.

[0095] As the rotating shaft 33 rotates, the baffle 42 is driven to rotate. The rotation of the baffle 42 will intermittently block half of the filter cover 43. Each time air is inhaled, it enters from the other side of the baffle 42, so that intermittent air intake operation can be performed. As the baffle 42 rotates, the air cylinder 45 fixedly installed on the baffle 42 also rotates. The rotation of the air cylinder 45 drives the internal piston 49 and the push rod 46 to rotate. Under the action of the guide rail 47, the push rod 46 will drive the piston 49 to move in the air cylinder 45, and cooperate with the spring 48 to achieve reciprocating operation, thereby producing a blowing effect. In conjunction with the jet cover 44, a reverse jet operation can be performed on the filter cover 43 to blow off the dust adhering to the filter cover 43, which is convenient for the next air intake and ensures the air intake volume.

[0096] The thermostat 6 is used to control the temperature in the high temperature box 1. Its working principle is to dissipate heat in the high temperature box 1 to reduce the temperature in the high temperature box 1. In combination with the heating block 8, the temperature in the high temperature box 1 can be kept constant.

[0097] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flue gas online monitoring system, comprising a high temperature box (1), characterized in that: It also includes a base cabinet (2); a collection unit connected to the high-temperature box (1) and used to collect smoke under a specific environment, the collection unit including a probe (4) fixedly mounted on the outside of the high-temperature box (1), the probe (4) including a housing (20), a conduit (21) fixedly connected to the housing (20), a sampling tube (22) fixedly connected to the conduit (21), and a dustproof component matched with the conduit (21) installed in the probe (4); A heating unit is installed in the high temperature box (1) and is used to heat the flue gas so that the flue gas reaches a monitoring temperature. The heating unit comprises a heating block (8) and a heating pipe fixedly installed inside the high temperature box (1). A temperature control component that cooperates with the heating block (8) and the heating pipe is installed in the high temperature box (1); An air suction unit is installed in the high temperature box (1) and the bottom cabinet (2) and is used to absorb smoke for monitoring. The air suction unit comprises a gas chamber (7) fixedly installed inside the high temperature box (1), a drainage pump (9) and an electric ball valve (19). A calibration solenoid valve (15), a sampling solenoid valve (16), a back-blowing solenoid valve (17) and a one-way throttle valve (18) are fixedly installed inside the bottom cabinet (2). A filter pressure reducing valve (3) is fixedly installed outside the bottom cabinet (2). An air guide assembly is installed between the high temperature box (1) and the bottom cabinet (2); A detection unit, installed inside the base cabinet (2), for detecting the content of a specific substance in the collected smoke, the detection unit comprising a light source (13), a spectrometer (14), and an HMI human-machine interface (11) fixedly installed inside the base cabinet (2), the HMI human-machine interface (11) being connected to the light source (13) and the spectrometer (14) via an I / O interface module (12); The dustproof component comprises a cyclone component (24) fixedly mounted inside the housing (20), the cyclone component (24) comprising an air inlet and an air outlet, and two ends of the cyclone component (24) are respectively fixedly connected to a primary dustproof mechanism and a secondary dustproof mechanism; The cyclone assembly (24) comprises a bracket (31) fixedly mounted inside the housing (20), a cyclone blade (34) fixedly mounted on the bracket (31), a rotating shaft (33) rotatably mounted through the middle of the cyclone blade (34), a dual-axis motor fixedly mounted on the bracket (31), a first driving end of the dual-axis motor fixedly connected to the rotating shaft (33), a heating cylinder (38) fixedly mounted on the second driving end of the dual-axis motor, and a mixing mechanism mounted on the heating cylinder (38); The mixing mechanism comprises an annular air chamber (36) fixedly mounted on a heating cylinder (38), the annular air chamber (36) being fixedly connected to an annular air pipe (37), the annular air pipe (37) being fixedly connected to a plurality of air supply pipes (32), an inner cover (35) and an outer cover (30) being fixedly mounted on the annular air chamber (36), each of the air supply pipes (32) passing through the outer cover (30) and extending into between the outer cover (30) and the inner cover (35); An air suction fan blade (39) is fixedly mounted on the heating cylinder (38), and the air suction fan blade (39) is located in the inner cover (35). A plurality of air inlet nozzles (41) are fixedly connected to the annular air chamber (36), and each of the air inlet nozzles (41) is fixedly connected to an air delivery channel (40), and each of the air delivery channels (40) is located in the inner cover (35). The inner cover (35) and the outer cover (30) are mechanically rotatably connected to the bracket (31), and the cyclone blade (34) is located between the outer cover (30) and the inner cover (35); The air delivery channel (40) is designed to be arc-shaped, and a filter screen is fixedly installed in the air delivery channel (40). The inner walls of the inner cover (35) and the outer cover (30) are both designed to be smooth.

2. The flue gas online monitoring system according to claim 1, characterized in that: The primary dust prevention mechanism comprises a plurality of electrostatic plates (26) fixedly mounted inside the housing (20); a square drain cover (25) is fixedly mounted on the plurality of electrostatic plates (26); the square drain cover (25) is connected to an air inlet of a cyclone assembly (24); an ash discharge hole is formed at the bottom of the housing (20); and a collection box (23) matched with the ash discharge hole is fixedly mounted at the bottom of the housing (20).

3. The flue gas online monitoring system according to claim 1, characterized in that: The secondary dust prevention mechanism comprises an air duct (27), an air passage (28) and a ventilation pipe (29) fixedly mounted on the outer shell (20); the air duct (27) penetrates the outer shell (20), and the air duct (27) is connected to the heating pipe; the air duct (27), the air passage (28) and the ventilation pipe (29) are connected; the ventilation pipe (29) is fixedly connected to the bracket (31); a filter cover (43) is fixedly connected to the air passage (28), and a recoil structure is installed in the filter cover (43); The recoil structure comprises a baffle (42) rotatably mounted inside the filter cover (43), the baffle (42) being designed in a semicircular arc shape, a jet cover (44) being fixedly mounted on the baffle (42), a gas cylinder (45) being fixedly mounted on the baffle (42), a piston (49) being slidably mounted inside the gas cylinder (45), a spring (48) being fixedly mounted between the piston (49) and the gas cylinder (45), a push rod (46) being fixedly mounted on a side of the piston (49) away from the spring (48), a ball bearing being rotatably mounted on an end of the push rod (46) away from the piston (49), an annular groove being formed on the filter cover (43), a guide rail (47) cooperating with the ball bearing being fixedly mounted in the annular groove, the rotating shaft (33) and the baffle (42) being fixedly connected, the rotating shaft (33) penetrating the filter cover (43), and the gas cylinder (45) and the jet cover (44) being connected via a pipe fitting.

4. The flue gas online monitoring system according to claim 1, characterized in that: The temperature control component comprises a temperature controller (6) fixedly mounted inside the high temperature box (1), and a temperature limit switch (5) matched with the temperature controller (6) is fixedly mounted outside the high temperature box (1).

5. The flue gas online monitoring system according to claim 1, characterized in that: The gas guide assembly comprises a pipe 1 fixedly connected to the calibration solenoid valve (15), the pipe 1 extending out of the bottom cabinet (2), and the calibration solenoid valve (15) and the gas chamber (7) are connected via a pipe 1; The filter pressure reducing valve (3) is fixedly connected with a pipe 2, the pipe 2 is connected with a one-way throttle valve (18), the one-way throttle valve (18) and the sampling electromagnetic valve (16) are connected via a pipe 3, the pipe 2 is fixedly connected with a pipe 4, the pipe 4 is connected with a back-blowing electromagnetic valve (17), the sampling electromagnetic valve (16) is connected with a heating block (8) via a pipe 2, the heating block (8) is connected with a drainage pump (9) via a pipe 3, the drainage pump (9) is fixedly connected with an exhaust pipe, the exhaust pipe passes through and extends out of the high temperature box (1); The heating pipe is connected to the electric ball valve (19), the back-blowing solenoid valve (17) is connected to the heating pipe via a pipe four, the electric ball valve (19) is fixedly connected to the gas chamber (7) via a pipe five, and the gas chamber (7) is fixedly connected to zirconium oxide (10) via a pipe five.

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