Cold dry method on-line sampling system
By using a three-stage heating system and phosphoric acid titration technology, the problems of clogging and inaccurate measurement in the cold dry sampling system are solved, enabling efficient and accurate transmission and monitoring of sample gas, reducing enterprise operation and maintenance costs, and making it suitable for environmental flue gas emission monitoring under complex working conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI CHANGQING ENERGY & CHEM IND CO LTD
- Filing Date
- 2025-04-08
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional cold-drying sampling systems are prone to clogging under complex operating conditions, leading to increased environmental risks and economic costs, and the measurement results are inaccurate, making it difficult to meet environmental law enforcement requirements.
A three-stage heating system consisting of a heated probe, a heated sampling probe, and a heated sampling tube is used, combined with phosphoric acid titration and nano-separation tube dehumidification technology to ensure that the sample gas is heated and kept dry throughout the process. A peristaltic pump and a separation tank prevent blockage, achieving pure sample gas transmission and automatic calibration.
It achieves distortion-free transmission of sample gas throughout the entire process, reduces component loss rate, improves measurement accuracy, reduces labor and economic costs, and meets the monitoring requirements of ultra-low emission standards.
Smart Images
Figure CN224262886U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sampling technology for continuous monitoring systems of environmental flue gas emissions from coal chemical and thermal power plants, specifically a cold-drying method online sampling system. Background Technology
[0002] The cold-drying online sampling system is specifically designed to meet the requirements of distortion-free and non-clogging sampling systems for online monitoring instruments. The system employs a triple heating structure combining a heated probe, an electrically heated sampling probe, and a high-temperature heated sampling tube. Since gas analyzers require the measured gas to be dry and clean, when high-humidity sample gas containing impurities enters the system, it undergoes heating, filtration, and drying to achieve sample gas extraction and pretreatment. Switching between the three-way valve and the calibration three-way valve allows for switching between cabinet calibration and full-process operation, as well as between calibration and measurement states, ensuring long-term stable operation of the gas analyzer. The measurement results of the cold-drying method are dry-based concentrations, while the measurement results of the hot-wet method, dilution extraction method, and direct measurement method are all wet-based concentrations. Since my country's emission limits are converted concentrations based on dry-based concentrations, the wet-based concentration results need to be converted and corrected by measuring humidity values. This has led to the cold-drying extraction analyzer occupying the majority of the domestic market. A search revealed a cold-drying online analysis sample gas processing system disclosed in Chinese patent CN212275402U, which includes a sampling unit, a sample gas processing unit, and a sample gas control unit connected through a sample gas pipeline. The sample gas processing unit includes a dust removal device, a dehumidification device, and a phosphoric acid introduction unit located upstream of the dehumidification device. The phosphoric acid introduction unit includes a first container holding phosphoric acid and a vaporization device connected to the first container through a first micro-pump. The vaporization device is connected to the sample gas pipeline. This invention introduces a phosphoric acid inlet unit before sample gas dehumidification, dripping phosphoric acid into the sample gas pipeline to create an acidic environment for the collected sample gas. This effectively suppresses the loss of water-soluble gases such as SO2, thereby making the measurement data of the downstream gas analyzer more accurate and reliable.
[0003] Currently, commonly used continuous emission monitoring systems for flue gas using the cold dry sampling method have the following problems: Traditional cold dry sampling systems manufactured by Beijing Xuedilong Technology Co., Ltd. and Beijing Kai'er Technology Development Co., Ltd. are difficult to cope with complex operating conditions during daily operation and maintenance. The sampling system frequently becomes clogged, requiring maintenance personnel to repeatedly climb the sampling platform for cleaning. It also easily leads to the failure of data upload efficiency to the national environmental control platform, which can easily be judged as abnormal operation of environmental protection facilities during environmental law enforcement inspections, causing environmental risks for enterprises and wasting a lot of human resources. Excessive addition of desulfurizing agent can lead to ammonia escape in the flue gas or condensation during the sampling process, resulting in low SO2 detection values or "0" for the cold dry direct extraction continuous emission monitoring system. It also causes problems such as excessive response time and indication error when using SO2 standard gas throughout the process. The problem stems from the precipitation of condensate, which dissolves SO2 and causes ammonia to escape. During continuous monitoring of flue gas emissions, secondary desulfurization occurs, and the resulting ammonium salts can adsorb SO2. Furthermore, ammonia is the only highly concentrated alkaline gas in the atmosphere. When emitted into the atmosphere, ammonia reacts with acidic gases such as nitric acid or sulfuric acid to form secondary fine particulate matter, including sulfates, nitrates, and ammonium salts. This is a significant contributor to the transformation of gaseous pollutants into particulate pollutants. Therefore, controlling ammonia escape will be a future direction for environmental protection. At the same time, the waste of large amounts of desulfurizing agents increases economic costs for enterprises.
[0004] To address the aforementioned problems, the inventors proposed a novel cold-drying online sampling system. Utility Model Content
[0005] To address the problems of traditional cold-drying sampling systems, such as frequent clogging requiring manual cleaning or instrument calibration, which leads to environmental risks and wastes significant human resources, or the inability to accurately control the amount of desulfurizing agent added causing ammonia escape and excessive response time and indication error during the entire SO2 standard gas supply process, this invention provides a cold-drying online sampling system.
[0006] In view of the above problems, the technical solution proposed by this utility model is as follows:
[0007] A cold-drying online sampling system includes a heated probe, one end of which is equipped with a filter, and the other end of which is equipped with a sampling probe. A compressed air control valve and a separation tank are respectively installed on both sides of the sampling probe. One end of the sampling probe is connected to a three-way connector. A peristaltic pump is installed on one side of the three-way connector, and a phosphate titration tank is installed on the same side of the peristaltic pump. A heated sampling tube is installed on one side of the three-way connector, one end of which is equipped with a condenser. A drying tube is installed on one end of the condenser, and one end of the drying tube is connected to a vacuum sampling pump. A three-way switching valve is installed on one end of the vacuum sampling pump, and a calibration three-way valve is connected on one side of the three-way switching valve. A filter pressure reducing valve and a standard gas cylinder are located on the same side of the calibration three-way valve. A gas analyzer is installed on one side of the three-way switching valve. Sample gas is extracted by the vacuum sampling pump. The heated probe enters the cold-drying online sampling system, raising the original flue gas temperature from 55±5℃ to 140±5℃. The sample gas then passes through a 0.1μm precision filter to remove impurities such as dust, sand, and liquid water, ensuring the sample gas entering the system is pure and above the flue gas dew point temperature. The sampling probe is reheated to prevent water vapor condensation after the addition of compressed air and phosphoric acid solution. The sample gas is then transported to the cabinet through a heated sampling tube, which maintains a high temperature throughout the process. It then enters the two-stage condenser, where the sample gas temperature is controlled between 1℃ and 3℃. When the condensed sample gas enters the nano-drying tube, the water-absorbing properties of the tube's inner wall cause moisture to be adsorbed, reducing the water content in the liquid. This method saves energy while achieving dehumidification without loss of NO, NO2, or SO2. x The sample gas contains water-soluble components such as H2S and HCl. After condensation and dehydration, the dried, clean, and intact sample gas at room temperature and pressure passes through the three-way switching valve installed on the pipeline before the gas analyzer. After being collected by the three-way switching valve, the sample gas enters the gas analyzer for sampling and analysis, providing a dry, clean, and continuous supply of sample gas to the continuous emission monitoring system for flue gas.
[0008] Preferably, the compressed air control valve is connected to the sampling probe between the filter and the three-way connector. The backflush frequency of the compressed air is set to once every 4 hours, and a backflush pattern of 40 seconds, 5 seconds pause, and repeated 4 times can be used to ensure that the sampling probe is not blocked by ammonium salt crystals, prevent insufficient sampling flow, and avoid instrument failure that would result in insufficient effective data uploaded by the enterprise to the national control platform.
[0009] Preferably, one end of the three-way connector is connected to the peristaltic pump and in series with the phosphoric acid titration vessel, and the other end is connected to the heated sampling tube. This allows phosphoric acid to be continuously mixed into the sampling flow path, creating an acidic environment for the sample gas. Based on the chemical properties of phosphoric acid, it is a ternary moderately strong acid, stronger than sulfurous acid. The H+ ions generated by the ionization of phosphoric acid in water further contribute to its acidity. +Preventing the reaction of SO2 with water to form sulfurous acid can effectively suppress SO2 loss; at the same time, the separation tank can collect excess phosphoric acid solution, thereby reducing pipeline blockage caused by the escape of ammonia and phosphoric acid crystals.
[0010] Preferably, one end of the three-way switching valve is connected to the gas analyzer, and the other end is connected to the outlet of the calibration three-way valve; or the outlet of the standard gas cylinder is connected in series with the filter pressure reducing valve and one end is connected to the calibration three-way valve, and the other end of the outlet of the calibration three-way valve is connected to the heated sampling tube and connected in series with the sampling probe, so as to realize the automatic calibration function of the instrument. By pre-setting the automatic calibration time interval, automatic calibration can be achieved. At the same time, by controlling the calibration three-way valve, both full-process calibration and cabinet calibration modes can be realized.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0012] The heating probe, heating sampling probe, and heating sampling tube of this invention can all be set to a temperature of 140-180℃ to keep the temperature of the sample gas above the dew point temperature during transmission. This allows the sample gas to remain undistorted throughout the entire process from the chimney to the cabinet, reducing the component loss rate of the sample gas to below 2%. The use of a full-process heating sampling system ensures that the moisture in the sample gas does not condense and that SO2 in the flue gas is not lost. This shortens the time for full-process verification, improves the consistency of the full-process standard gas data, avoids the generation of ammonia escape, and precisely controls the amount of desulfurizing agent added, which can save enterprises a lot of economic costs and achieve accurate monitoring under ultra-low emission standards.
[0013] This invention relates to a drying tube made of nanomaterial. Utilizing the water-absorbing properties of the inner wall of the nanomaterial tube, moisture is adsorbed onto the inner wall, thus reducing the water content in the liquid. Through membrane permeation technology, water vapor in the sample gas reacts chemically with the permeation membrane and is adsorbed into the wall of the hollow fiber tube, subsequently evaporating into the backflushing airflow, achieving continuous drying of the sample gas. It is resistant to corrosion from various corrosive substances such as oxidants, acids, and alkalis. This gives the nanomaterial drying tube excellent durability when handling gases containing corrosive components. Compared to traditional dehumidification equipment, nanomaterial drying tube dehumidifiers typically have lower energy consumption. Based on the permeation characteristics of the membrane, it does not require a large energy input, thus achieving dehumidification without loss of NO, NO2, and SO2 while saving energy. x Components that are easily soluble in water, such as H2S and HCl; during the dehydration process, water is removed in gaseous form and no condensate is produced;
[0014] This utility model's filter is made of titanium-nickel alloy, achieving a filtration accuracy of 0.1μm. It features uniform pore size, stable pore shape, high separation rate, high porosity, low filtration resistance, and high permeability. It is heat-resistant and can be used normally below 280℃ (humid state). It exhibits good chemical stability, resistance to acid and alkali corrosion (pH 2-12), and good oxidation resistance. No particulate shedding occurs, preventing secondary pollution of the original solution. It also boasts good mechanical properties, low pressure drop, high flow rate, and can be used for both pressure and vacuum filtration, with simple maintenance.
[0015] This invention combines a separator tank with high-frequency pulsed compressed air. The separator tank is made of 304 stainless steel, offering high reliability, simple operation, and strong adaptability. It operates reliably and requires no maintenance; the stainless steel structure is durable and corrosion-resistant. Setting the compressed air backflushing frequency to once every 4 hours, using a 40-second backflushing followed by a 5-second pause, repeated 4 times, ensures that the sampling probe is not blocked by ammonium salt crystals, preventing insufficient sampling flow that could lead to instrument malfunction and insufficient effective data uploaded to the national control platform. The separator tank allows for control of phosphoric acid, preventing excessive phosphoric acid solution from clogging the sampling pipeline and allowing for the recovery of excess phosphoric acid solution to avoid waste. This effectively protects the sampling pipeline process, extends component life, and eliminates the need for maintenance personnel to repeatedly climb the platform for cleaning, reducing labor costs.
[0016] This utility model combines a standard gas cylinder, a filter pressure reducing valve, and a calibration three-way valve, or connects directly to a sampling probe via a heated sampling tube, to achieve cabinet / full-process calibration functions. Automatic calibration can be achieved simply by pre-setting the automatic calibration time interval. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the sampling probe and its connection structure of this utility model;
[0019] Figure 3 This is a schematic diagram of the standard gas cylinder and its connection structure according to this utility model.
[0020] In the diagram: 1. Heating probe; 2. Filter; 3. Sampling probe; 4. Separator; 5. T-connector; 6. Compressed air control valve; 7. Peristaltic pump; 8. Phosphoric acid titration tank; 9. Heated sampling tube; 10. Condenser; 11. Drying tube; 12. Vacuum sampling pump; 13. Three-way switching valve; 14. Gas analyzer; 15. Standard gas cylinder; 16. Filter pressure reducing valve; 17. Calibration three-way valve. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.
[0023] Example 1
[0024] Please see Figures 1-3 This utility model provides a technical solution: a cold-drying online sampling system, comprising a vacuum sampling pump 12 drawing gas into a heated probe 1, raising the temperature of the original flue gas to 140±5℃, and a filter 2 removing impurities such as dust, sand, and liquid water from the sample gas to ensure that the sample gas entering the system is pure and above the dew point temperature of the flue gas. The sampling probe 3 is reheated to ensure that water vapor in the sample gas does not condense after the addition of compressed air and phosphoric acid solution. The sample gas is transported to a cabinet through a heated sampling tube 9, which is heated throughout the process, and enters a two-stage condenser 10 to control the temperature of the sample gas within 1℃~3℃ and remove some condensate. When the condensed sample gas enters a nano-drying tube 11, the water is adsorbed on the inner wall of the tube due to its absorbency, thereby reducing the water content in the liquid. This system achieves dehumidification without loss of NO, NO2, and SO2 while saving energy. x The sample gas contains water-soluble components such as H2S and HCl. After condensation and dehydration, the dried, clean, and intact sample gas at room temperature and pressure passes through a three-way switching valve 13 installed on the pipeline before the gas analyzer 14. After passing through the three-way switching valve 13, the sample gas enters the gas analyzer 14 to complete the sampling and analysis, providing a dry, clean, and continuous supply of sample gas to the continuous emission monitoring system for flue gas.
[0025] By adopting the above technical solution, impurities with a particle size >0.1μm in complex sample gas can be filtered and dried, and the effective components are not lost. The treated sample gas is continuously supplied to meet the needs of the gas analyzer.
[0026] The sampling probe 1, sampling probe 3, and heated sampling tube 9 can all be set to a heating temperature of 140-180℃.
[0027] By adopting the above technical solution, a three-stage heating system is constructed, which ensures that the moisture in the sample gas does not condense and that SO2 in the flue gas is not lost. This shortens the time for full-process verification, improves the consistency of the full-process standard gas data, avoids the generation of ammonia escape, and accurately controls the amount of desulfurizing agent added. This can save enterprises a lot of economic costs and is of great significance for accurate monitoring under ultra-low emission standards.
[0028] The compressed air control valve 6 is connected to the sampling probe 3 between the filter 2 and the tee connector 5.
[0029] By adopting the above technical solution, the backflush frequency of compressed air is set to once every 4 hours. The backflush mode is repeated 4 times with a 40-second backflush followed by a 5-second pause. This ensures that the sampling probe will not be blocked by ammonium salt crystals, preventing insufficient sampling flow and instrument failure that would result in insufficient effective data uploaded by the enterprise to the national control platform.
[0030] One end of the three-way connector 5 is connected to the peristaltic pump 7 and connected in series with the phosphate titration vessel 8, and the other end is connected to the heated sampling tube 9.
[0031] By adopting the above technical solution, phosphoric acid can be continuously mixed into the sampling flow path, making the sample gas in an acidic environment. According to the chemical properties of phosphoric acid, it is a ternary moderately strong acid, stronger than sulfurous acid. The H+ ions generated by the ionization of phosphoric acid in water... + Preventing the reaction of SO2 with water to form sulfurous acid can effectively suppress SO2 loss; at the same time, the separation tank can collect excess phosphoric acid solution, thereby reducing pipeline blockage caused by the escape of ammonia and phosphoric acid crystals.
[0032] Condenser 10, two-stage refrigeration.
[0033] By adopting the above technical solution, the outlet gas dew point temperature can be maintained within 1℃ to 3℃ when the ambient temperature is 2℃~40℃, the inlet gas dew point temperature is 2℃~40℃, and the gas flow rate is 1L / min~5L / min, so that the gas analyzer can be used at full capacity. In addition, 76% of the moisture in the sample gas can be removed by two peristaltic pumps.
[0034] Drying tube 11 is a nano-scale drying tube.
[0035] By adopting the above technical solution, when the sample gas enters the nano-drying tube, the water absorption property of the inner wall of the tube is utilized to adsorb water onto the inner wall, thereby reducing the water content in the liquid. Through membrane permeation technology, water vapor in the sample gas undergoes a chemical reaction with the permeation membrane and is adsorbed into the tube wall of the hollow fiber tube, and then evaporates into the backflushing airflow, achieving continuous drying of the sample gas. It can resist the erosion of various corrosive substances such as oxidants, acids, and alkalis. Compared with traditional dehumidification equipment, nano-drying tube dehumidifiers typically have lower energy consumption. Based on the permeation characteristics of the membrane, it does not require a large amount of energy input, thus achieving dehumidification without loss of NO, NO2, and SO2 while saving energy. x Components that are easily soluble in water, such as H2S and HCl.
[0036] One end of the three-way switching valve 13 is connected to the gas analyzer 14, and the other end is connected to the outlet of the calibration three-way valve 17; or the outlet of the standard gas cylinder 15 is connected in series with the filter pressure reducing valve 16 and one end is connected to the inlet of the calibration three-way valve 17, and the other end of the outlet of the calibration three-way valve 17 is connected to the heat tracing sampling tube 9 and in series with the sampling probe 3.
[0037] By adopting the above technical solution, the switching between sample gas and standard gas can be realized, and the instrument has an automatic calibration function. Automatic calibration can be achieved by pre-setting the automatic calibration time interval; or by controlling the calibration three-way valve, two modes of full-process calibration and cabinet calibration can be realized, avoiding the original manual calibration by changing the standard gas.
[0038] Specifically, the sample gas is drawn into the online cold-drying sampling system by the vacuum sampling pump 12 and heated by the probe 1, raising the original flue gas temperature from 55±5℃ to 140±5℃. After passing through the 0.1μm filter 2, impurities such as dust, sand, and liquid water in the sample gas are removed, ensuring that the sample gas entering the online cold-drying sampling system is pure and above the dew point temperature of the flue gas. The sampling probe 3 is reheated to ensure that the water vapor in the sample gas will not condense after the addition of compressed air and phosphoric acid solution. The sample gas is delivered to the cabinet through the heated sampling tube 9, which is heated at high temperature throughout the process, and enters the two-stage condenser 10. The refrigeration part adopts a semiconductor refrigerator and a dual-path dehumidification device, which is equivalent to two single-path dehumidifiers, that is, there are two relatively independent gas paths. When the ambient temperature is 2℃~40℃, the inlet gas dew point temperature is 2℃~40℃, and the gas flow rate is 1L / min~5L / min, the outlet gas dew point temperature can be maintained within 1℃~3℃, which is suitable for gas flow rates that are too high or gas inlet temperatures that are too high. The gas path section of the refrigeration unit is made of stainless steel and PTFE tubing, making it compatible with various gas analysis devices. The dehumidification components are designed as replaceable parts, facilitating maintenance and repair. It also boasts high dew point control accuracy and sensitivity. When the condensed sample gas enters the nano-drying tube, the water-absorbing properties of the inner wall of the tube cause moisture to be adsorbed, thus reducing the water content in the liquid. Through membrane permeation technology, water vapor in the sample gas reacts chemically with the permeate membrane and is adsorbed into the hollow fiber tube wall, subsequently evaporating into the backflushing airflow, achieving continuous drying of the sample gas. It is resistant to corrosion from various substances such as oxidants, acids, and alkalis. Compared to traditional dehumidification equipment, nano-drying tube dehumidifiers typically have lower energy consumption. Based on the membrane permeation characteristics, they do not require a large energy input, thus achieving dehumidification without loss of NO, NO2, and SO2 while saving energy. xComponents easily soluble in water, such as H2S and HCl, are removed. The dried, clean, and intact sample gas, after condensation and dehydration, is passed through a three-way switching valve 13 installed on the pipeline before the gas analyzer 14. Based on the electromagnetic attraction principle: when the solenoid valve coil is energized, a magnetic field is generated, attracting the piston and causing it to move in another direction. At this time, the intermediate channel connects with the inlet channel, and the outlet channel is closed. Gas enters the intermediate channel from the inlet channel and then exits through the outlet channel. The three-way solenoid valve also operates on a spring-centric principle: it consists of a valve body, an electromagnet, and a piston. The valve body contains three channels: an inlet channel, an outlet channel, and an intermediate channel. The intermediate channel is cross-connected with the inlet and outlet channels. When the electromagnet is not energized, the spring pushes the piston in one direction, connecting the intermediate channel with the outlet channel, while the inlet channel is closed. In this case, liquid or gas enters the intermediate channel from the inlet channel and then exits through the outlet channel. The three-way solenoid valve also operates on a double-acting principle: it provides bidirectional flow control as needed. When the electromagnet is energized, the piston moves to a position where the intermediate channel connects to both the inlet and outlet channels. At this time, the sample gas can simultaneously enter the middle channel from the inlet channel or flow from the middle channel to the outlet channel. When the electromagnet is not energized, the piston will be pushed back to its original position by the spring, achieving the opposite flow direction. The sample gas and standard gas converge through the three-way switching valve 13 and then enter the gas analyzer 14. One sample gas can be analyzed after entering the gas analyzer 14. Switching to the other standard gas cylinder 15, the standard gas passes through the filter pressure reducing valve 16 and then through the calibration three-way valve 17 before directly entering the gas analyzer 14 or entering the sampling probe 3 to achieve the instrument's cabinet / full-process calibration function. Automatic calibration can be achieved by pre-setting the automatic calibration time interval. The phosphoric acid solution stored in the phosphoric acid titration tank 8 is dripped into the probe by the peristaltic pump 7 to make the sample gas in an acidic environment. According to the chemical properties of phosphoric acid, phosphoric acid is a ternary medium-strong acid, stronger than sulfurous acid. The H+ ions generated by the ionization of phosphoric acid in water... + Preventing the reaction of SO2 with water to form sulfurous acid effectively suppresses SO2 loss. Excess phosphoric acid solution can be collected via separator 4, while simultaneously reducing pipeline blockage caused by ammonia and phosphoric acid crystal escape. By controlling the compressed air control valve 6 to set the compressed air backflushing frequency to once every 4 hours, using a backflushing pattern of 40 seconds followed by a 5-second pause, repeated 4 times, the sampling probe is ensured not to be blocked by ammonium salt crystals, preventing insufficient sampling flow. Based on the above principles, this implementation case can deliver dry, clean, and continuous sample gas to the continuous emission monitoring system for flue gas, and has an automatic calibration function. Through multiple anti-clogging measures, it reduces manual maintenance costs, offering good economic and environmental benefits. It solves current industry problems and is particularly suitable for complex exhaust outlets with high humidity and high dust levels.
[0039] In the embodiments provided in this application, it should be understood that the disclosed systems, modules, and methods can be implemented in other ways. For example, the module embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules or units, and may be electrical, mechanical, or other forms.
[0040] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.
Claims
1. A cold-dry online sampling system comprising a heated probe rod (1), characterized in that, The heating probe (1) is equipped with a filter (2) at one end, and a sampling probe (3) is equipped with a sampling probe (3) at the other end. A compressed air control valve (6) and a separation tank (4) are respectively installed on both sides of the sampling probe (3). A three-way connector (5) is connected to one end of the sampling probe (3). A peristaltic pump (7) is provided on one side of the three-way connector (5). A phosphate titration tank (8) is provided on the same side of the peristaltic pump (7). A heated sampling tube (9) is provided on one side of the three-way connector (5). A condenser (10) is installed at one end of the device, a drying tube (11) is installed at one end of the condenser (10), a vacuum sampling pump (12) is connected to one end of the drying tube (11), a three-way switching valve (13) is provided at one end of the vacuum sampling pump (12), a calibration three-way valve (17) is connected to one side of the three-way switching valve (13), a filter pressure reducing valve (16) and a standard gas cylinder (15) are provided on the same side of the calibration three-way valve (17), and a gas analyzer (14) is provided on one side of the three-way switching valve (13).
2. The cold-trap on-line sampling system of claim 1, wherein, The condenser (10) and the drying tube (11) are connected to the heat-traced sampling tube (9) at the outlet of the tee joint (5), and the heating probe (1) is placed on the pipeline before the filter (2).
3. The cold-trap on-line sampling system of claim 1, wherein, The heating probe (1) is an electrically heated structure.
4. The cold-trap on-line sampling system of claim 1, wherein, The filter (2) is made of titanium-nickel alloy.
5. The cold-trap on-line sampling system of claim 1, wherein, The drying tube (11) is a nano-distribution tube.
6. The cold-trap on-line sampling system of claim 1, wherein, The separation tank (4) is connected to the sampling probe (3) between the filter (2) and the tee connector (5).
7. The cold-trap on-line sampling system of claim 1, wherein, The compressed air control valve (6) is connected to the sampling probe (3) between the filter (2) and the tee connector (5).
8. The cold-trap on-line sampling system of claim 1, wherein, One end of the three-way connector (5) is connected to the peristaltic pump (7) and connected in series to the phosphate titration tank (8), and the other end is connected to the heated sampling tube (9).
9. The cold-trap on-line sampling system of claim 1, wherein, One end of the three-way switching valve (13) is connected to the gas analyzer (14), and the other end is connected to the outlet of the calibration three-way valve (17). The outlet of the standard gas cylinder (15) is connected in series with the filter pressure reducing valve (16), and one end is connected to the calibration three-way valve (17). The other end of the outlet of the calibration three-way valve (17) is connected to the heated sampling tube (9), and the sampling probe (3) is connected in series.