Portable on-line monitoring device for condensable particulate matters of stationary source and use method of portable on-line monitoring device

Abstract

The invention belongs to the technical field of environment monitoring, and particularly relates to a portable fixed source condensable particulate matter online monitoring device and a use method. The device comprises a semiconductor refrigeration module, seven peristaltic pumps, a liquid storage tank, a PLC, three liquid level sensors, a conductivity sensor, a conductivity detection pool, a pH sensor, a pH detection pool, an ammonium ion sensor, an ammonium ion detection pool, a pH adjusting module, a reaction pool, an alkali liquor bottle, a stirring motor and the like. The device can monitor the concentration of the condensable particulate matters in the flue gas on line, and the pipeline is simple and effective to clean. The device is low in investment cost, convenient to sample and carry, small in occupied area, light in weight and low in maintenance cost; the sampling process is highly automatic, and the equipment burden of environment monitoring personnel is reduced; the defects that in the prior art, the monitoring process is complex, online monitoring is not supported, and the size and weight are large are effectively overcome. The method can be widely applied to on-line monitoring of condensable particulate matters of stationary pollution sources.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental monitoring, and particularly relates to an on-line monitoring device and a use method for condensable particulate matter in waste gas. Background Art

[0002] The emissions of condensable particulate matter (CPM) from industrial source flue gas have exceeded those of filterable particulate matter. The implementation of ultra-low emission transformation has put forward higher requirements for the emissions and monitoring of unconventional pollutants such as CPM and NH3. CPM is a key indicator for the efficient and stable operation of ultra-low emission transformation technology, and its ultrafine particle morphology and complex composition can cause biological toxicity and damage the atmospheric environment.

[0003] At present, the monitoring of CPM mainly relies on the off-line monitoring method of manual sampling and laboratory analysis, and there are few on-line methods that can achieve in-situ and real-time monitoring.

[0004] The off-line methods include dry impact condensation (EPA Method 202) and dilution condensation method. In the dry impact condensation method, CPM condenses in the condensation tube and is collected by filtration with an impact bottle and a filter membrane, resulting in a positive deviation caused by the absorption of components such as SO2. In the dilution condensation method, the rapid dilution and condensation process of simulated flue gas discharged into the atmosphere is simulated. The required dilution chamber is large, heavy, has low condensation efficiency, and has a negative deviation of wall condensation.

[0005] The on-line method saves manpower and material resources, is convenient for remote early warning and emission supervision, and is a technical means urgently needed for CPM monitoring and control. However, the existing on-line CPM equipment is large in size, heavy in weight, high in cost, and poor in portability, which is not conducive to its application in industrial sites. Summary of the Invention

[0006] In view of the deficiencies of the existing technology, the purpose of the present invention is to provide a portable, on-line monitoring, and time-consuming short fixed-source condensable particulate matter monitoring device and a use method.

[0007] The portable fixed-source condensable particulate matter on-line monitoring device provided by the present invention includes: a semiconductor refrigeration module 1, a P1 peristaltic pump 201, a P2 peristaltic pump 202, a P3 peristaltic pump 203, a P4 peristaltic pump 204, a P5 peristaltic pump 205, a P6 peristaltic pump 206, a P7 peristaltic pump 207, a liquid storage tank 3, a PLC controller 4; an L1 high liquid level sensor 501, an L2 low liquid level sensor 502, an L3 liquid level sensor (03, a conductivity sensor 6, a conductivity detection cell 7, a pH sensor 8, a pH detection cell 9, an ammonium ion sensor 10, an ammonium ion detection cell 11, a pH adjustment module 12, a reaction cell 13, an alkali solution bottle 14, a stirring motor 15, a transmission shaft 16, a stirring paddle 17, a cleaning solution bottle 18; a data line 401 connecting the PLC controller 4 with each sensor (such as 501, 503, 6, 8, 10, 15).

[0008] Wherein:

[0009] For the semiconductor refrigeration module (1), a flue gas inlet and a cleaning liquid inlet are provided at the front end, and a flue gas outlet after condensation and a condensate outlet are provided at the rear end; the condensate outlet is connected to the peristaltic pump P1, and its function is to reduce the temperature of the flue gas transported by the heating cigarette holder, so that the condensable particulate matter condenses from a gaseous state to a liquid state. Specifically, air-cooled or water-cooled semiconductor refrigeration can be adopted. Other refrigeration technologies can also be used, such as vapor compression refrigeration, absorption refrigeration, adsorption refrigeration, laser refrigeration, and magnetic refrigeration technology.

[0010] For the peristaltic pump P1, a hose is connected to the rear end to feed liquid into the top of the liquid storage tank. Its function is to send the condensate from the liquid outlet of the refrigeration module into the liquid storage tank.

[0011] For the liquid storage tank, a three-way structure is used to connect the peristaltic pump P2 and the peristaltic pump P3 at the rear end. Its function is to temporarily store the condensate within a sampling period. The liquid storage tank is provided with an L2 low liquid level sensor and an L1 high liquid level sensor. The corresponding liquid level of the L2 low liquid level sensor in the liquid storage tank is the lowest liquid level required to ensure that the sensor probes in each detection pool can normally contact the condensate; the corresponding liquid level of the L1 high liquid level sensor in the liquid storage tank is used to ensure the maximum liquid level at which the condensate in each detection pool does not overflow. An inlet and an air outlet are left at the top of the liquid storage tank to ensure the smooth inflow of liquid. The tank body is provided with a transparent observation window or is completely made of transparent material to facilitate the observation of the condensate situation.

[0012] For the peristaltic pump P2, a three-way structure is used to connect the conductivity detection pool and the pH detection pool at the rear end. Its function is to send the condensate in the liquid storage tank into the conductivity detection pool and the pH detection pool.

[0013] For the peristaltic pump P3, a hose is connected to the rear end to feed liquid into the bottom of the reaction pool. Its function is to send the condensate in the liquid storage tank into the reaction pool. When the condensate in the reaction pool reaches the specified liquid level of the L3 liquid level sensor, the feeding of condensate into the reaction pool stops.

[0014] For the conductivity detection pool, the peristaltic pump P6 is connected to the rear end, and a conductivity sensor is arranged in the detection pool to detect the conductivity of the condensate. Its function is a container for containing the condensate and coming into contact with the conductivity sensor. The pool body is provided with a transparent observation window or is completely made of transparent material to facilitate the observation of the condensate situation and its contact with the conductivity sensor. The connection between the conductivity sensor and the detection pool should be sealed and fixed to avoid random changes in the contact conditions between the sensor and the condensate. An air outlet should be left at the top of the detection pool to ensure the smooth inflow of liquid.

[0015] The function of the conductivity sensor is to detect the conductivity of the condensate.

[0016] The pH detection cell is connected to a P6 peristaltic pump at the rear end. A pH sensor is installed inside the detection cell to detect the pH of the condensate. Its function is to obtain the pH value of the condensate and calculate the amount of alkali solution to be added to the reaction cell based on the pH value. The cell body is provided with a transparent observation window or is entirely made of transparent material to facilitate observing the condition of the condensate and its contact with the pH sensor. The connection between the pH sensor and the detection cell should be sealed and fixed to avoid random changes in the contact conditions between the sensor and the condensate. An air outlet should be provided at the top of the detection cell to ensure the smooth inflow of the liquid.

[0017] The function of the pH sensor is to detect the pH data of the condensate.

[0018] The pH adjustment module includes an alkali solution bottle, a P4 peristaltic pump, a P5 peristaltic pump, a reaction cell, a stirring motor, and an L3 liquid level sensor. Among them, the components in contact with the alkali solution should be made of acid and alkali resistant materials, including the alkali solution bottle, peristaltic pump, motor drive shaft, stirring paddle, reaction cell, and hose. Its function is to adjust the pH of the condensate to a range suitable for the detection of the ammonium ion sensor, avoid damaging the ammonium ion sensor, improve the detection accuracy, and extend the service life.

[0019] The rear end of the alkali solution bottle is connected to the P4 peristaltic pump through a hose. Its function is to store the alkali solution used to adjust the pH of the condensate. The alkali solution can specifically be sodium hydroxide solution or potassium hydroxide solution.

[0020] The P4 peristaltic pump is a high-precision peristaltic pump. Its rear end is connected to a hose to feed liquid into the top of the reaction cell. Its function is to pump the alkali solution into the reaction cell according to the calculated amount of alkali solution.

[0021] The rear end of the reaction cell is connected to the P5 peristaltic pump. There is a drive shaft and a stirring paddle of the stirring motor inside the reaction cell, and an L3 liquid level sensor outside. Its function is to make a quantitative amount of condensate react with a quantitative and known pH alkali solution. The total volume of the two liquids injected into the reaction cell should be less than the total volume that the ammonium ion detection cell can accommodate. The cell body is provided with a transparent observation window or is entirely made of transparent material to facilitate observing the reaction situation between the condensate and the alkali solution, as well as the working condition of the stirring paddle.

[0022] The stirring motor is connected to the stirring paddle inside the reaction cell by a drive shaft. Its function is to slowly start stirring after the inflow of the condensate and the alkali solution into the reaction cell ends, so that the mixed liquid reacts evenly.

[0023] The L3 liquid level sensor corresponds to the liquid level of the reaction cell, which is the volume of the condensate in the reaction cell before adding the alkali solution. Its function is to control the volume of the condensate participating in the reaction in the reaction cell.

[0024] The rear end of the P5 peristaltic pump is connected to the ammonium ion detection cell. Its function is to send the condensate in the reaction cell into the ammonium ion detection cell.

[0025] The ammonium ion detection cell is connected to a P6 peristaltic pump at the rear end. Its function is to be a container for holding the condensate in contact with the ammonium ion sensor. The cell body is provided with a transparent observation window or is entirely made of a transparent material to facilitate observing the situation of the condensate and its contact with the ammonium ion sensor. The connection between the ammonium ion sensor and the detection cell should be sealed and fixed to avoid random changes in the contact conditions between the sensor and the reaction solution. An air outlet should be left at the top of the detection cell to ensure the smooth inflow of the liquid.

[0026] The ammonium ion sensor functions to detect the ammonium ion concentration of the reaction solution.

[0027] The inlet of the P6 peristaltic pump is connected to the liquid outlets of the conductivity detection cell, the pH detection cell, and the ammonium ion detection cell. Its function is to discharge the liquid in each detection cell.

[0028] The inlet of the P7 peristaltic pump is connected to the cleaning solution bottle. Its function is to send the cleaning solution to the cleaning solution inlet of the refrigeration module.

[0029] The cleaning solution bottle functions to store the cleaning solution used to clean the residue in the liquid storage tank, each detection cell, the reactor, and the pipeline. The cleaning solution can specifically be ultrapure water.

[0030] The PLC controller controls the working process of each part of the detection system through a program. The functions of the PLC controller can be realized by using the currently common PLC controllers, such as the Siemens PLC S7-1200 series.

[0031] The present invention also provides a usage method for the above-mentioned portable fixed-source condensable particulate matter on-line monitoring device. The specific process includes:

[0032] (I) On-line measurement

[0033] (1) The flue gas enters through the smoke gun and is transported to the semiconductor refrigeration module 1 for cooling to form condensate.

[0034] (2) Start the P1 peristaltic pump 201, and the condensate is transported by the P1 peristaltic pump 201 to the liquid storage tank 3. The liquid level that meets the detection requirements should exceed the L2 low liquid level sensor 502 and not exceed the L1 high liquid level sensor 501. When the liquid level reaches the L1 high liquid level sensor 501, stop introducing the flue gas and the condensation. The liquid in the liquid storage tank 3 will be sent to the detection cell and the reaction cell. Turn off the P1 peristaltic pump 201.

[0035] (3) Start the P2 peristaltic pump 202. Part of the liquid in the liquid storage tank 3 is sent by the P2 peristaltic pump 202 to the conductivity detection cell 7 and the pH detection cell 9 to detect the conductivity and pH of the liquid respectively. Calculate the volume of the lye required according to the pH value. The working duration of the P2 peristaltic pump 202 is calculated based on the flow rate of the P2 peristaltic pump 202 and the volume of the condensate required in the conductivity detection cell 7 and the pH detection cell 9. When the working duration is reached, turn off the P2 peristaltic pump 202.

[0036] (4) Start the P3 peristaltic pump 203. The remaining liquid in the liquid storage tank 3 is sent by the P3 peristaltic pump 203 to the reaction tank 13. When the liquid level reaches the L3 liquid level sensor 503, stop the liquid inlet and turn off the P3 peristaltic pump 203.

[0037] (5) Start the P4 peristaltic pump 204. According to the calculated volume, the P4 peristaltic pump 204 inputs the lye from the top of the reaction tank 13. Turn off the P4 peristaltic pump 204. Start the motor stirrer 15 to make the two reaction liquids react fully. The total volume of the two liquids input into the reaction tank 13 should be less than the volume that the ammonium ion detection cell 11 can accommodate.

[0038] (6) Start the P5 peristaltic pump 205 to send the reaction liquid to the ammonium ion detection cell 11 to detect the ammonium ion concentration of the reaction liquid. Turn off the P5 peristaltic pump 205.

[0039] (7) After all the conductivity, pH, and ammonium ion sensors have completed the detection, start the P6 peristaltic pump 206 to drain the remaining liquid in each detection cell.

[0040] (8) Calculate the concentration of condensable particulate matter in the stationary source. The calculation formula is:

[0041] C WSI =k1×EC m +b, (1)

[0042]

[0043] Among them, C WSI is the ionic mass concentration in the CPM condensate; EC m is the calculated conductivity processed from the conductivity, pH, and ammonium ion data; k1 and b are the constants of the empirical formula obtained by linear fitting; k2 is the empirical constant; V g is the volume of the condensate; V L is the volume of the flue gas; C CPM is the mass concentration of CPM in the flue gas;

[0044] (II) Pipeline cleaning

[0045] (1) Turn off the semiconductor refrigeration module 1.

[0046] (2) Start the P7 peristaltic pump 207. The cleaning liquid is transported by the P1 peristaltic pump 201 to the cleaning liquid inlet of the refrigeration module 1. The cleaning liquid flows through the refrigeration module 1 and flows out from the liquid outlet. Then turn off the P7 peristaltic pump 207.

[0047] (3) Start the P1 peristaltic pump 201. The cleaning liquid is transported by the P1 peristaltic pump 201 to the liquid storage tank 3. When it reaches the liquid level corresponding to the liquid level sensor 501, turn off the P1 peristaltic pump 201.

[0048] (4) Start the P2 peristaltic pump 202. The cleaning liquid is transported by the P2 peristaltic pump 202 to the conductivity detection cell 7 and the pH detection cell 9. The working duration of the P2 peristaltic pump 202 is calculated based on the flow rate of the P2 peristaltic pump 202 and the volume of the cleaning liquid required by the conductivity detection cell 7 and the pH detection cell 9. The working duration should be the same as that during on-line measurement. When the working duration is reached, turn off the P2 peristaltic pump 202.

[0049] (5) Start the P3 peristaltic pump 203. The cleaning liquid is transported by the P3 peristaltic pump 203 to the reaction tank 13. When it reaches the liquid level corresponding to the liquid level sensor 503, turn off the P3 peristaltic pump 203. Start the stirring motor 15 to clean the stirring paddle 17. Then turn off the stirring motor 15.

[0050] (6) Start the P5 peristaltic pump 205. The cleaning liquid is transported by the P5 peristaltic pump 205 to the ammonium ion detection cell 11. After the transportation is completed, turn off the P5 peristaltic pump 205.

[0051] (7) Start the P6 peristaltic pump 206 to drain the cleaning liquid in each detection cell. The cleaning is completed.

[0052] The start-up, shutdown, and parameter calculation of the above components are all automatically completed and realized by the PLC controller 4. Description of the Drawings

[0053] Figure 1 It is a schematic structural diagram of the portable fixed-source condensable particulate matter on-line monitoring device of the present invention.

[0054] Figure 2 It is a schematic diagram of the pH adjustment module in the device of the present invention.

[0055] Figure 3 It is a graph of the measured values of this device and the standard method.

[0056] Reference numerals in the figure: 1 is a semiconductor refrigeration module, 201 is a peristaltic pump P1, 202 is a peristaltic pump P2, 203 is a peristaltic pump P3, 204 is a peristaltic pump P4, 205 is a peristaltic pump P5, 206 is a peristaltic pump P6, 207 is a peristaltic pump P7, 3 is a liquid storage tank, 4 is a PLC controller, 501 is a high liquid level sensor L1, 502 is a low liquid level sensor L2, 503 is a liquid level sensor L3, 6 is a conductivity sensor, 7 is a conductivity detection cell, 8 is a pH sensor, 9 is a pH detection cell, 10 is an ammonium ion sensor, 11 is an ammonium ion detection cell, 12 is a pH adjustment module, 13 is a reaction cell, 14 is an alkali solution bottle, 15 is a stirring motor, 16 is a transmission shaft, 17 is a stirring paddle, 18 is a cleaning liquid bottle. 401 is a data cable connecting the PLC controller and the sensors (501, 503, 6, 8, 10, 15). Detailed implementation mode

[0057] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of this patent is not limited thereto.

[0058] Embodiment: As Figure 1 shown, a portable fixed-source condensable particulate matter on-line monitoring device includes: a semiconductor refrigeration module 1, a peristaltic pump P1 201, a peristaltic pump P2 202, a peristaltic pump P3 203, a peristaltic pump P4 204, a peristaltic pump P5 205, a peristaltic pump P6 206, a peristaltic pump P7 207, a liquid storage tank 3, a PLC controller 4, a data cable 401 connecting the PLC controller and the sensors, a high liquid level sensor L1 501, a low liquid level sensor L2 502, a liquid level sensor L3 503, a conductivity sensor 6, a conductivity detection cell 7, a pH sensor 8, a pH detection cell 9, an ammonium ion sensor 10, an ammonium ion detection cell 11, a pH adjustment module 12, a reaction cell 13, an alkali solution bottle 14, a stirring motor 15, a transmission shaft 16, a stirring paddle 17, a cleaning liquid bottle 18.

[0059] In this embodiment, the semiconductor refrigeration module 1 is a water-cooled semiconductor refrigeration technology or an air-cooled semiconductor refrigeration technology, specifically such as a semiconductor liquid circulation heat exchange method or a semiconductor air-cooled forced convection heat exchange method. In addition to semiconductor refrigeration, other refrigeration technologies can also be used, such as vapor compression refrigeration, absorption refrigeration, adsorption refrigeration, laser refrigeration technology, and magnetic refrigeration technology.

[0060] In this embodiment, the peristaltic pump P1 is connected to a hose at the rear end to feed liquid into the top of the liquid storage tank. The condensate is sent from the liquid outlet of the refrigeration module into the liquid storage tank. It can be specifically a linear peristaltic pump or a rotary peristaltic pump.

[0061] In this embodiment, the liquid storage tank is connected to peristaltic pump P2 and peristaltic pump P3 at the rear end by a tee structure. It temporarily stores the condensate within one sampling period. The liquid storage tank is provided with a low liquid level sensor L2 and a high liquid level sensor L1. The maximum liquid level of the condensate within one sampling period is set corresponding to the liquid level of the high liquid level sensor. The top of the liquid storage tank is provided with a liquid inlet and a gas outlet, and the tank body is provided with a transparent observation window or is entirely made of transparent material. Specifically, it can be glass or polytetrafluoroethylene plastic. The bottom is funnel-shaped to facilitate the discharge of the condensate.

[0062] In this embodiment, peristaltic pump P2 is connected to the conductivity detection cell and the pH detection cell at the rear end by a tee structure. Its function is to send the condensate in the liquid storage tank into the conductivity detection cell and the pH detection cell.

[0063] In this embodiment, peristaltic pump P3 is connected to a hose at the rear end to feed liquid into the bottom of the reaction tank. Its function is to send the condensate in the liquid storage tank into the reaction tank. When the condensate in the reaction tank reaches the specified liquid level of liquid level sensor L3, the feeding of condensate into the reaction tank stops.

[0064] In this embodiment, the conductivity detection cell is connected to peristaltic pump P6 at the rear end. A conductivity sensor is arranged in the detection cell to detect the conductivity of the condensate. It is a container for holding the condensate in contact with the conductivity sensor. The cell body is provided with a transparent observation window or is entirely made of transparent material to facilitate observing the situation of the condensate and its contact with the conductivity sensor. The connection between the conductivity sensor and the detection cell should be sealed and fixed to avoid random changes in the contact conditions between the sensor and the condensate. An air outlet should be provided at the top of the detection cell to ensure the smooth inflow of the liquid. The main material can specifically be glass or polytetrafluoroethylene plastic. The bottom is funnel-shaped to facilitate the discharge of the condensate.

[0065] In this embodiment, the conductivity sensor is used to detect the conductivity of the condensate. Specifically, it can be a platinum black electrode or a titanium alloy electrode, and the outer shell should be made of glass or plastic. Preferably, it should have a temperature compensation and correction function.

[0066] In this embodiment, the pH detection cell is connected to peristaltic pump P6 at the rear end. A pH sensor is arranged in the detection cell to detect the pH of the condensate. Its function is to obtain the pH value of the condensate and calculate the amount of alkali solution to be added to the reaction tank based on the pH value. The cell body is provided with a transparent observation window or is entirely made of transparent material. The connection between the pH sensor and the detection cell should be sealed and fixed. An air outlet should be provided at the top of the detection cell to ensure the smooth inflow of the liquid. The main material can specifically be glass or polytetrafluoroethylene plastic. The bottom is funnel-shaped to facilitate the discharge of the condensate.

[0067] In this embodiment, the pH sensor is used to detect the pH data of the condensate. Specifically, it can be a platinum electrode or a glass electrode, and the outer shell should be made of glass or plastic, such as PEEK, Ryton materials. Preferably, it should have a temperature compensation and correction function.

[0068] In this embodiment, the pH adjustment module includes an alkali solution bottle, a peristaltic pump P4, a peristaltic pump P5, a reaction tank, a stirring motor, and a liquid level sensor L3. Among them, the components in contact with the alkali solution should be made of acid and alkali resistant materials, including the alkali solution bottle, peristaltic pump, motor drive shaft, stirring paddle, reaction tank, and hose.

[0069] In this embodiment, the alkali solution bottle is connected to the peristaltic pump P4 at the rear end through a hose. Its function is to store the alkali solution used to adjust the pH of the condensate. The alkali solution can specifically be sodium hydroxide solution or potassium hydroxide solution.

[0070] In this embodiment, the peristaltic pump P4 is a high-precision peristaltic pump, and the rear end is connected to a hose to feed liquid into the top of the reaction tank. Its function is to pump the alkali solution into the reaction tank according to the calculated amount of alkali solution. It can specifically be a linear peristaltic pump or a rotary peristaltic pump. Preferably, it is a flow-type high-precision peristaltic pump with flow display and calibration functions.

[0071] In this embodiment, the reaction tank is connected to the peristaltic pump P5 at the rear end. There is a drive shaft and a stirring paddle of the stirring motor inside the reaction tank, and a liquid level sensor L3 outside. Its function is to make a certain amount of condensate react with a certain amount of alkali solution with a known pH. The total volume of the two liquids injected into the reaction tank should be less than the total volume that the ammonium ion detection tank can accommodate. The tank body is provided with a transparent observation window or is completely made of transparent material to facilitate observing the reaction of the condensate and the alkali solution, as well as the working condition of the stirring paddle. An air outlet should be left at the top of the reaction tank to ensure the smooth inflow of liquid. The main material can specifically be glass or polytetrafluoroethylene plastic. The bottom is funnel-shaped to facilitate the discharge of the condensate.

[0072] In this embodiment, the stirring motor is connected to the stirring paddle inside the reaction tank by a drive shaft. Its function is to slowly start stirring after the inflow of the condensate and the alkali solution into the reaction tank ends, so that the mixed liquid reacts evenly. It can specifically be a stepper motor, a DC motor, an AC motor, or a brushless motor.

[0073] In this embodiment, the stirring paddle is specifically four-blade type, one-word type, centrifugal type, or fan blade type. The material is corrosion-resistant material, such as plastic or glass.

[0074] In this embodiment, the liquid level sensor L3 corresponds to the liquid level of the reaction tank, which is the volume of the condensate in the reaction tank before adding the alkali solution. Its function is to control the volume of the condensate participating in the reaction in the reaction tank. It can specifically be a contact liquid level sensor, such as a submersible liquid level sensor or an optoelectronic liquid level sensor; or a non-contact liquid level sensor, such as a capacitive liquid level sensor or an ultrasonic liquid level sensor.

[0075] In this embodiment, the peristaltic pump P5 is connected to the ammonium ion detection tank at the rear end. Its function is to send the condensate in the reaction tank into the ammonium ion detection tank.

[0076] In this embodiment, the ammonium ion detection cell is connected to a peristaltic pump P6 at the rear end. Its function is to be a container for holding the condensate in contact with the ammonium ion sensor. The cell body is provided with a transparent observation window or is made entirely of a transparent material to facilitate observing the situation of the condensate and its contact with the ammonium ion sensor. The connection between the ammonium ion sensor and the detection cell should be sealed and fixed to avoid random changes in the contact conditions between the sensor and the reaction solution. An air outlet should be provided at the top of the detection cell to ensure the smooth inflow of the liquid. The main body material can specifically be glass or polytetrafluoroethylene plastic. The bottom is funnel-shaped to facilitate the discharge of the condensate.

[0077] In this embodiment, the ammonium ion sensor is used to detect the ammonium ion concentration of the reaction solution. The outer shell should be made of glass or plastic materials, such as PPS material. Preferably, it should have the function of compensating and correcting for potassium ion, pH, and temperature parameters.

[0078] In this embodiment, the peristaltic pump P6 has its liquid inlet connected to the liquid outlets of the conductivity detection cell, pH detection cell, and ammonium ion detection cell. Its function is to discharge the liquid in each detection cell.

[0079] In this embodiment, the peristaltic pump P7 has its liquid inlet connected to the cleaning liquid bottle (18). Its function is to send the cleaning liquid to the cleaning liquid inlet of the refrigeration module (1).

[0080] In this embodiment, the cleaning liquid bottle is used to store the cleaning liquid for cleaning the residues in the liquid storage tank, each detection cell, the reactor, and the pipeline. The cleaning liquid can specifically be ultrapure water.

[0081] The usage method of this embodiment specifically includes the following process:

[0082] (I) On-line measurement

[0083] 1. The flue gas enters through the smoke gun and is transported to the semiconductor refrigeration module 1 for cooling to form condensate.

[0084] 2. Start the peristaltic pump P1 201, and the condensate is transported by the peristaltic pump P1 201 to the liquid storage tank 3. The liquid level meeting the detection requirements should exceed the L2 low liquid level sensor 502 and not exceed the L1 high liquid level sensor 501. When the liquid level reaches the L1 high liquid level sensor 501, stop introducing the flue gas and the condensate. The liquid in the liquid storage tank 3 will be sent to the detection cell and the reaction cell. Turn off the peristaltic pump P1 201.

[0085] 3. Start the peristaltic pump P2 202. Part of the liquid in the liquid storage tank 3 is sent by the peristaltic pump P2 202 to the conductivity detection cell 7 and the pH detection cell 9 to respectively detect the conductivity and pH of the liquid. Calculate the volume of the alkali solution required according to the pH value. The working duration of the peristaltic pump P2 202 is calculated based on the flow rate of the peristaltic pump P2 202 and the volume of the condensate required in the conductivity detection cell 7 and the pH detection cell 9. When the working duration is reached, turn off the peristaltic pump P2 202.

[0086] 4. Start the P3 peristaltic pump 203. The remaining liquid in the liquid storage tank 3 is sent to the reaction tank 13 by the P3 peristaltic pump 203. When the liquid level reaches the level of the L3 liquid level sensor 503, stop the liquid inlet and close the P3 peristaltic pump 203.

[0087] 5. Start the P4 peristaltic pump 204. According to the calculated volume, the P4 peristaltic pump 204 inputs the lye from the top of the reaction tank 13. Close the P4 peristaltic pump 204. Start the motor stirrer 15 to make the two reaction liquids react fully. The total volume of the two liquids input into the reaction tank 13 should be less than the volume that the ammonium ion detection cell 11 can accommodate.

[0088] 6. Start the P5 peristaltic pump 205 to send the reaction liquid to the ammonium ion detection cell 11 to detect the ammonium ion concentration of the reaction liquid. Close the P5 peristaltic pump 205.

[0089] 7. After all the conductivity, pH, and ammonium ion sensors have been detected, start the P6 peristaltic pump 206 to discharge the remaining liquid in each detection cell.

[0090] 8. Calculate the concentration of condensable particulate matter in the stationary source:

[0091] Through the calculated conductivity EC after processing the conductivity, pH, and ammonium ion data m , combined with the condensate volume V g and the flue gas volume V L parameters, the concentration of condensable particulate matter is obtained according to the built-in CPM empirical formulas for different emission sources.

[0092] For different types of emission sources, the PLC controller will automatically select the corresponding type of empirical formula through the program.

[0093] (II) Pipeline cleaning

[0094] 1. Turn off the semiconductor refrigeration module 1.

[0095] 2. Start the P7 peristaltic pump 207. The cleaning liquid is sent to the cleaning liquid inlet of the refrigeration module 1 by the P1 peristaltic pump 201. The cleaning liquid flows through the refrigeration module 1 and flows out from the liquid outlet. Close the P7 peristaltic pump 207.

[0096] 3. Start the P1 peristaltic pump 201. The cleaning liquid is sent to the liquid storage tank 3 by the P1 peristaltic pump 201. When the liquid level reaches the corresponding level of the liquid level sensor 501, close the P1 peristaltic pump 201.

[0097] 4. Start the P2 peristaltic pump 202, and the cleaning liquid is transported by the P2 peristaltic pump 202 to the conductivity detection cell 7 and the pH detection cell 9. The working duration of the P2 peristaltic pump 202 is calculated based on the flow rate of the P2 peristaltic pump 202 and the volume of the cleaning liquid required by the conductivity detection cell 7 and the pH detection cell 9. The working duration should be the same as that during on-line measurement. When the working duration is reached, turn off the P2 peristaltic pump 202.

[0098] 5. Start the P3 peristaltic pump 203, and the cleaning liquid is transported by the P3 peristaltic pump 203 to the reaction cell 13. When the liquid level sensor 503 reaches the corresponding liquid level, turn off the P3 peristaltic pump 203. Start the stirring motor 15 to clean the stirring paddle 17. Then turn off the stirring motor 15.

[0099] 6. Start the P5 peristaltic pump 205, and the cleaning liquid is sent by the P5 peristaltic pump 205 to the ammonium ion detection cell 11. After the transportation is completed, turn off the P5 peristaltic pump 205.

[0100] 7. Start the P6 peristaltic pump 206 to discharge the cleaning liquid in each detection cell. The cleaning is completed.

[0101] (III) Example detection results

[0102] To verify the actual monitoring performance of the device of the present invention, the device and the standard method were synchronously measured and compared on-site at fixed pollution sources. The test objects covered the flue gas sampling points of typical emission sources such as coal-fired power plants, iron and steel smelters, and industrial boilers, and the working stability of the portable device in a heterogeneous emission environment was systematically investigated.

[0103] The test data is as Figure 3 shown. The measured values of the device and the standard method have a significant linear correlation (correlation coefficient r = 0.983), and they show synchronous response characteristics during the dynamic change process of the CPM emission concentration. Further analysis shows that the multi-source adaptation algorithm built in the device can effectively eliminate the interference of the CPM component differences of different emission sources on the measurement results by dynamically matching the characteristic parameters of coal combustion flue gas, metallurgical waste gas, and boiler tail gas. At typical test points such as the sintering machine head of the iron and steel plant and the flue after dust removal in the power plant, the absolute deviation between the device and the standard method is less than 15%, verifying its measurement consistency under multi-condition conditions.

Claims

1. A portable online monitoring device for fixed source condensable particulate matter, characterized in that: include: Semiconductor refrigeration module (1), P1 peristaltic pump (201), P2 peristaltic pump (202), P3 peristaltic pump (203), P4 peristaltic pump (204), P5 peristaltic pump (205), P6 peristaltic pump (206), P7 peristaltic pump (207), liquid storage tank (3), PLC controller (4), L1 high liquid level sensor (501), L2 low liquid level sensor (502), L3 liquid level sensor (503), conductivity sensor (6), conductivity detection cell (7), pH sensor (8), pH detection cell (9), ammonium ion sensor (10), ammonium ion detection cell (11), pH adjustment module (12), reaction cell (13), alkali liquid bottle (14), stirring motor (15), transmission shaft (16), stirring paddle (17), cleaning liquid bottle (18), data line (401) connecting PLC controller and each sensor; wherein: The semiconductor refrigeration module (1) is provided with a smoke inlet and a cleaning liquid inlet at the front end, and a condensed smoke outlet and a condensate outlet at the rear end; the condensate outlet is connected to the P1 peristaltic pump (201); its function is to reduce the temperature of the smoke delivered by the heating smoke gun, so that the condensable particles are condensed from the gaseous state to the liquid state; The P1 peristaltic pump (201) has a rear end connected to a hose that feeds liquid into the top of the liquid storage tank (3), thereby delivering the condensed liquid from the liquid outlet of the refrigeration module (1) into the liquid storage tank (3); The liquid storage tank (3) has a rear end connected to the P2 peristaltic pump (202) and the P3 peristaltic pump (203) by a three-way structure; its function is to temporarily store the condensate within a sampling cycle; the liquid storage tank (3) is provided with an L2 low liquid level sensor (502) and an L1 high liquid level sensor (501); the L2 low liquid level sensor (502) corresponds to the low liquid level of the liquid storage tank (3), ensuring that the sensor probe in each detection pool can normally contact the minimum liquid level required for the condensate; the L1 high liquid level sensor (501) corresponds to the high liquid level of the liquid storage tank (3), ensuring the maximum liquid level at which the condensate in each detection pool does not overflow; a liquid inlet and an air outlet are reserved at the top of the liquid storage tank (3); The P2 peristaltic pump (202) has a rear end connected to the conductivity detection tank (7) and the pH detection tank (9) by a three-way structure, and its function is to send the condensate in the liquid storage tank (3) to the conductivity detection tank (7) and the pH detection tank (9); The P3 peristaltic pump (203) has a rear end connected to a hose for feeding liquid into the bottom of the reaction tank (13), and its function is to feed the condensate in the liquid storage tank (3) into the reaction tank (13); when the condensate in the reaction tank (13) reaches the specified liquid level of the L3 liquid level sensor (503), the condensate is stopped from being fed into the reaction tank (13); The conductivity detection pool (7) is connected to a P6 peristaltic pump (206) at the rear end, and a conductivity sensor (6) is arranged in the detection pool to detect the conductivity of the condensate; the function of the conductivity sensor (6) is to hold the condensate in contact with the conductivity sensor (6); the connection between the conductivity sensor (6) and the conductivity detection pool (7) should be tightly sealed and fixed; and an air outlet should be left at the top of the detection pool; The pH detection pool (9) is connected to a P6 peristaltic pump (206) at its rear end. A pH sensor (8) is arranged in the pH detection pool (9) to detect the pH value of the condensate. The pH value of the condensate is obtained and the amount of alkali solution to be added to the reaction pool (13) is calculated based on the pH value. The pH sensor (8) is tightly connected and fixed to the pH detection pool (9). An air outlet is left at the top of the detection pool. The pH adjustment module (12) comprises an alkali solution bottle (14), a P4 peristaltic pump (204), a P5 peristaltic pump (205), a reaction tank (13), a stirring motor (15), and an L3 liquid level sensor (503); wherein the components contacting the alkali solution should be made of acid- and alkali-resistant materials, including the alkali solution bottle (14), the P4 peristaltic pump (204), the motor transmission shaft (16), the stirring paddle (17), the reaction tank (13), and a connecting hose; and its function is to adjust the pH of the condensate to a range suitable for detection by the ammonium ion sensor; wherein: The alkali solution bottle (14) is connected to a P4 peristaltic pump (204) at its rear end via a hose, and its function is to store alkali solution for adjusting the pH of the condensate; The P4 peristaltic pump (204) is a high-precision peristaltic pump, and a hose is connected to the rear end to feed liquid into the top of the reaction tank (13). Its function is to pump the alkali solution into the reaction tank (13) according to the calculated amount of alkali solution; The reaction tank (13) is connected to a P5 peristaltic pump (205) at its rear end; the reaction tank (13) is provided with a transmission shaft (16) of a stirring motor (15) and a stirring paddle, and is provided with an L3 liquid level sensor (503) outside; its function is to make a certain amount of condensate react with a certain amount of alkaline solution with a known pH value; the total amount of the two liquids injected into the reaction tank (13) should be less than the total volume that can be accommodated by the ammonium ion detection tank (11); The stirring motor (15) is connected to a stirring paddle (17) in the reaction tank (13) by a transmission shaft (16), and its function is to start stirring slowly after the condensate and the alkali solution have finished flowing into the reaction tank (13) so as to make the mixed solution react evenly; The L3 liquid level sensor (503) corresponds to the liquid level of the reaction tank (13), which is the volume of the condensate in the reaction tank (13) before adding the alkali solution; its function is to control the volume of the condensate participating in the reaction in the reaction tank (13); The P5 peristaltic pump (205) has a rear end connected to the ammonium ion detection tank (11); its function is to send the condensate in the reaction tank (13) to the ammonium ion detection tank (11); The ammonium ion detection pool (11) is connected to a P6 peristaltic pump (206) at the rear end, and serves as a container for the condensate in contact with the ammonium ion sensor (10); the connection between the ammonium ion sensor (10) and the detection pool should be tightly sealed and fixed; an air outlet should be left at the top of the detection pool; The ammonium ion sensor (10) is used to detect the ammonium ion concentration of the reaction solution; The P6 peristaltic pump (206) has a liquid inlet connected to the liquid outlets of the conductivity detection cell (7), the pH detection cell (9), and the ammonium ion detection cell (11); its function is to discharge the liquid in each detection cell; The P7 peristaltic pump (207) has a liquid inlet connected to the cleaning liquid bottle (18) and is used to deliver the cleaning liquid to the cleaning liquid inlet of the refrigeration module (1); The cleaning liquid bottle (18) is used to store cleaning liquid for cleaning the liquid storage tank, each detection cell, the reactor and the residue in the pipeline; the cleaning liquid can be ultrapure water; The PLC controller (4) controls the working process of each part of the detection system through a program.

2. The portable online monitoring device for fixed source condensable particulate matter according to claim 1 is characterized in that: The semiconductor refrigeration module (1) specifically adopts air-cooled or water-cooled semiconductor refrigeration; or adopts steam compression refrigeration, absorption refrigeration, adsorption refrigeration, laser refrigeration or magnetic refrigeration.

3. The portable online monitoring device for fixed source condensable particulate matter according to claim 1 is characterized in that: The alkali solution is a sodium hydroxide solution or a potassium hydroxide solution.

4. The portable online monitoring device for fixed source condensable particulate matter according to claim 1 is characterized in that: The liquid storage tank (3) is provided with a transparent observation window or is made entirely of transparent material to facilitate observation of the condensate; The conductivity detection cell (7) is provided with a transparent observation window or is made entirely of transparent material, so as to facilitate observation of the condensate and its contact with the conductivity sensor (6); The pH detection pool (9) is provided with a transparent observation window or is made entirely of transparent material, so as to facilitate observation of the condensate and its contact with the pH sensor (8); The reaction tank (13) is provided with a transparent observation window or is made entirely of transparent material, so as to facilitate observation of the reaction between the condensate and the alkali solution, as well as the working condition of the stirring paddle (17); The ammonium ion detection cell (11) is provided with a transparent observation window or is made entirely of transparent material, so as to facilitate observation of the condition of the condensate and its contact with the ammonium ion sensor (10).

5. The method for using the portable online monitoring device for fixed source condensable particulate matter according to any one of claims 1 to 4, characterized in that: The specific process is: (I) Online measurement (1) Flue gas enters from a smoke gun and is transported to a semiconductor refrigeration module (1) for cooling to form condensate, which is then discharged from a condensate outlet of the refrigeration module; after condensation, the flue gas is discharged from a gas outlet; (2) Start the P1 peristaltic pump (201), and the condensate is transported to the liquid storage tank (3) by the P1 peristaltic pump (201); the liquid level that meets the detection requirements should exceed the L2 low liquid level sensor (502) and not exceed the L1 high liquid level sensor (501); when the liquid level reaches the L1 high liquid level sensor (501), stop the intake of flue gas and condensation; the liquid in the liquid storage tank (3) will be sent to the detection pool and the reaction pool; turn off the P1 peristaltic pump (201); (3) starting the P2 peristaltic pump (202); a portion of the liquid in the liquid storage tank (3) is sent by the P2 peristaltic pump (202) to the conductivity detection tank (7) and the pH detection tank (9) to detect the conductivity and pH of the liquid respectively; the required volume of alkali solution is calculated according to the pH value; the working time of the P2 peristaltic pump (202) is calculated according to the flow rate of the P2 peristaltic pump (202) and the volume of condensate required by the conductivity detection tank (7) and the pH detection tank (9); when the working time is reached, the P2 peristaltic pump (202) is turned off; (4) starting the P3 peristaltic pump (203); the remaining liquid in the liquid storage tank (3) is sent to the reaction tank (13) by the P3 peristaltic pump (203); when the liquid level reaches the liquid level of the L3 liquid level sensor (503), the liquid supply is stopped and the P3 peristaltic pump (203) is turned off; (5) starting the P4 peristaltic pump (204), and inputting the alkali solution from the top of the reaction tank (13) according to the calculated volume; closing the P4 peristaltic pump (204); starting the motor (15) for stirring to allow the two reaction solutions to react fully; the total amount of the two liquids input into the reaction tank (13) should be less than the volume that the ammonium ion detection tank (11) can accommodate; (6) starting the P5 peristaltic pump (205) to deliver the reaction solution to the ammonium ion detection tank (11) to detect the ammonium ion concentration of the reaction solution; and closing the P5 peristaltic pump (205); (7) After all the conductivity, pH, and ammonium ion sensors have been tested, the P6 peristaltic pump (206) is started to discharge the remaining liquid in each test cell; (8) Calculate the concentration of condensable particulate matter from stationary sources using the following formula: C WSI =k1×EC m +b, (1) Among them, C WSI is the mass concentration of ions in CPM condensate; EC m is the calculated conductivity after processing the conductivity, pH and ammonium ion data; k1 and b are constants of the empirical formula obtained by linear fitting; k2 is an empirical constant; V g is the volume of condensate; V L is the volume of smoke; C CPM is the mass concentration of CPM in flue gas; (2) Pipeline cleaning (1) Turn off the refrigeration module (1); (2) starting the P7 peristaltic pump (207), and delivering the cleaning liquid to the cleaning liquid inlet of the refrigeration module (1) by the P1 peristaltic pump (201); the cleaning liquid flows through the refrigeration module (1) and flows out from the liquid outlet; and closing the P7 peristaltic pump (207); (3) starting the P1 peristaltic pump (201), and the cleaning liquid is transported to the liquid storage tank (3) by the P1 peristaltic pump (201); when the liquid level reaches the corresponding liquid level of the liquid level sensor (501), the P1 peristaltic pump (201) is turned off; (4) starting the P2 peristaltic pump (202), and the cleaning liquid is transported by the P2 peristaltic pump (202) to the conductivity detection pool (7) and the pH detection pool (9); the working time of the P2 peristaltic pump (202) is calculated based on the flow rate of the P2 peristaltic pump (202) and the volume of the cleaning liquid required by the conductivity detection pool (7) and the pH detection pool (9); the working time should be consistent with that during online measurement; when the working time is reached, the P2 peristaltic pump (202) is turned off; (5) Starting the P3 peristaltic pump (203), the cleaning liquid is transported to the reaction tank (13) by the P3 peristaltic pump (203); when the liquid level corresponding to the liquid level sensor (503) is reached, the P3 peristaltic pump (203) is turned off; starting the stirring motor (15) to clean the stirring paddle (17); and turning off the stirring motor (15); (6) starting the P5 peristaltic pump (205), and delivering the cleaning liquid to the ammonium ion detection tank (11) by the P5 peristaltic pump (205); after the delivery is completed, turning off the P5 peristaltic pump (205); (7) Start the P6 peristaltic pump (206) to discharge the cleaning liquid in each detection pool; complete the cleaning.

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