Anti-adsorption filter condensing device for sulfur trioxide analyzer in flue gas
Patent Information
- Application Number
- CN202522549412.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-01
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-01
AI Technical Summary
Existing sulfur trioxide analyzers are prone to damage and pipe blockage during detection, and their anti-adsorption structure is inadequate, leading to inaccurate test results.
The design incorporates a combination of an anti-adsorption heating and filtration sampling unit, a condensation unit, and a filtration interception device. It includes a detachable filter chamber, heating pipes, a double-helix condenser, and a multi-stage filtration structure. High-temperature anti-adsorption and precise condensation are achieved through a polytetrafluoroethylene coating and a gradient condenser. Combined with a high-temperature solenoid valve and a precision filter membrane, the integrity and purity of the sample are ensured.
It effectively prevents the loss of sulfur trioxide and pipeline blockage during the sampling process, improves the accuracy and reliability of detection, adapts to complex environments with high dust and high humidity, and ensures stable sampling over a long period of time.
Smart Images
Figure CN224933978U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of flue gas composition monitoring equipment, and more specifically, to an anti-adsorption filtration and condensation device for a sulfur trioxide analyzer in flue gas. Background Technology
[0002] Monitoring sulfur trioxide (STO) concentration is a crucial component of air quality monitoring, and various methods exist for detecting STO concentration. This equipment is a fully automated online method developed based on the laboratory controlled condensation method for STO detection using ion chromatography. It utilizes a combination of multiple pumps and valves to achieve automatic fraction collection, rinsing, monitoring, and backflushing. Employing multi-stage filtration technology and integrating a high-sensitivity ion chromatograph, along with automatic sampling and signal triggering via a peristaltic pump, it ensures the accuracy of STO detection results.
[0003] The anti-adsorption filtration and condensation device is a key component of the sulfur trioxide analyzer. Sulfur trioxide is easily soluble in water, and traditional condensation dehumidification will result in the loss of sulfur trioxide due to condensation, leading to lower detection results. In addition, dust and water droplets in the flue gas can easily clog the sampling pipeline. Furthermore, existing devices mostly use a single condenser and have not optimized the anti-adsorption structure for the characteristics of sulfur trioxide. Utility Model Content
[0004] The purpose of this invention is to address the problems of easy loss of sulfur trioxide, easy blockage of pipelines, and imperfect anti-adsorption structure when detecting and analyzing sulfur trioxide concentration.
[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution:
[0006] The anti-adsorption filtration and condensation device of the sulfur trioxide analyzer in flue gas includes an anti-adsorption heating filtration sampling unit, a condensation unit, and a filtration interception device unit connected in sequence through pipelines.
[0007] The anti-adsorption heating filter sampling unit includes a detachable filter chamber and a heating pipe. The detachable filter chamber has a built-in composite filter material with a decreasing pore size gradient. The inner wall of the heating pipe is coated with a polytetrafluoroethylene anti-adsorption coating and is connected to an external temperature control system to maintain the flue gas temperature above the dew point temperature.
[0008] The condensation unit includes a condenser and a temperature control device. The condenser has a double-helix structure, and the temperature control device is used to control the condensation temperature to achieve moisture separation.
[0009] The filtration and interception device unit includes a precision filter membrane, which is used to remove residual impurities.
[0010] As a preferred technical solution of this application, the anti-adsorption heating filter sampling unit further includes a high-temperature solenoid valve, the valve core of which is made of high-temperature resistant alloy material.
[0011] As a preferred technical solution of this application, the condensation unit is a gradient condenser, which has multiple nested nickel alloy heat exchange chambers inside, and each chamber is connected to a constant temperature circulating water system.
[0012] As a preferred technical solution of this application, the filter interception device unit has a built-in three-layer composite filter structure, including a PTFE filter, a glass fiber membrane and an activated carbon adsorption layer that are sequentially attached from top to bottom.
[0013] As a preferred technical solution of this application, the anti-adsorption heating filter sampling unit, the condensation unit and the filter interception device unit are connected by a retaining ring assembly. The retaining ring is provided with a polytetrafluoroethylene retaining sleeve and forms a wedge-shaped plastic sealing structure by bolt pre-tightening force.
[0014] As a preferred technical solution of this application, the air inlet of the high-temperature solenoid valve is connected to the high-temperature sampling pipeline of the analyzer, and the air outlet of the high-temperature solenoid valve is sealed to the air inlet of the gradient condenser through a retaining ring assembly.
[0015] As a preferred technical solution of this application, the outlet of the gradient condenser is sealed to the inlet of the filter interception device unit through a retaining ring assembly.
[0016] As a preferred technical solution of this application, the outlet of the filter interception device unit is connected to the inlet of the sulfur trioxide concentration analyzer.
[0017] As a preferred technical solution of this application, the device adopts a top-down integrated structure, which sequentially includes an injection pump with an internal solenoid valve three-way combination for switching on and off high-temperature sample gas and injecting high-purity water, a gradient condenser for staged condensation of the sample gas, and a filtration and interception device with an internal precision filter membrane for purifying the condensed sample gas collection liquid. The quantitative injection pump, gradient condenser, and filtration and interception device are connected by upper and lower pressure rings. The pressure rings are equipped with polytetrafluoroethylene sleeves, and the inlet of the filtration and interception device is equipped with a filter retainer. The outlet of the gradient condenser is connected to the air inlet and the collector inlet through a three-way valve seat.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0019] 1. By employing a heating pipe with an inner wall coated with polytetrafluoroethylene (PTFE) to prevent adsorption, and by stably controlling the flue gas temperature at a dew point of 10-20℃ or higher, the loss of sulfur trioxide during sampling due to condensation dissolution and adsorption on the pipe wall is fundamentally avoided. Combined with the precise temperature control of the condensation unit and the smooth quartz glass inner wall, efficient condensation and separation of moisture are achieved, while greatly reducing the residue of sulfur trioxide. This ensures the representativeness of the samples entering the final testing stage, significantly improves the accuracy and reliability of the analytical data, effectively prevents the adsorption and loss of sulfur trioxide, and significantly improves the accuracy of detection.
[0020] 2. By setting up a multi-stage gradient filtration system, the front-end sampling unit uses composite filter media with pore sizes decreasing from 10μm to 0.5μm, which can efficiently intercept dust and droplets of different particle sizes in flue gas; the rear-end filtration unit is equipped with a precision filter membrane of 0.1-0.3μm, which can further remove ultrafine particles. This design effectively solves the problem that traditional sampling pipelines are easily blocked by dust and water droplets, ensuring long-term continuous and stable sampling. It is especially suitable for complex industrial flue gas environments with high dust and high humidity, has strong anti-clogging ability, and adapts to complex working conditions. Attached Figure Description
[0021] Figure 1 This is a front view of the anti-adsorption filtration and condensation device of the flue gas sulfur trioxide analyzer of this utility model.
[0022] Figure 2 This is a cross-sectional view of the anti-adsorption filtration and condensation device of the sulfur trioxide analyzer in flue gas according to this utility model.
[0023] Figure 3 This is a front view of the anti-adsorption heating filter sampling unit of the flue gas sulfur trioxide analyzer of this utility model;
[0024] Figure 4 This is a front view of the condensation unit of the sulfur trioxide analyzer in flue gas according to this utility model;
[0025] Figure 5 This is a front view of the filtration and interception device unit of the sulfur trioxide analyzer in flue gas according to this utility model;
[0026] Figure 6 This is a flowchart of the sulfur trioxide detection process in flue gas according to this utility model.
[0027] The image shows:
[0028] 1. Metering pump; 2. Condenser sleeve; 3. Filter; 4. Pressure ring; 5. Trapezoidal condenser; 6. Precision filter membrane; 7. Three-way valve seat; 8. Collector; 9. Collector exhaust port; 10. Sulfur trioxide inlet; 11. High-purity water inlet; 12. Filter retainer. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.
[0030] like Figures 1 to 6 As shown, this embodiment proposes an anti-adsorption filtration and condensation device for a sulfur trioxide analyzer in flue gas, comprising an anti-adsorption heating filtration sampling unit, a condensation unit, and a filtration interception device unit connected sequentially by pipelines; the anti-adsorption heating filtration sampling unit includes a detachable filter chamber and a heating pipeline, the detachable filter chamber contains a composite filter material with a decreasing pore size gradient, the composite filter material is composed of a glass fiber filter membrane and a polytetrafluoroethylene filter screen, with a pore size range of 10μm to 0.5μm; the heating pipeline has a polytetrafluoroethylene anti-adsorption coating on its inner wall and is connected to an external temperature control system to maintain the flue gas temperature at 10-20°C above the dew point temperature; the condensation unit includes a double-helix condenser and a temperature regulating device: the double-helix condenser is made of corrosion-resistant quartz glass with a smooth inner wall; the temperature regulating device is used to precisely control the condensation temperature to achieve moisture separation and reduce sulfur trioxide loss; the filtration interception device unit includes a precision filter membrane with a pore size of 0.1–0.3μm, used to remove residual impurities;
[0031] High-temperature flue gas first enters the anti-adsorption heating filtration sampling unit. Its internal gradient composite filter material progressively intercepts large particles and droplets in the flue gas, completing preliminary purification. The filter material's pore size gradient decreases from 10μm to 0.5μm, efficiently intercepting impurities of different particle sizes. The filter chamber has sealed threaded interfaces at both ends to ensure no flue gas leakage and facilitates periodic filter material replacement. The composite filter material is resistant to acid and alkali corrosion and adapts to the acidic environment of the flue gas. Simultaneously, under the precise control of the temperature control system, the heating pipeline maintains the flue gas temperature above the dew point, ensuring that sulfur trioxide gas does not condense due to temperature drops and passes safely in gaseous form. This effectively prevents losses due to adsorption and dissolution in the initial sampling stage. The gaseous sample, after preliminary purification and insulation, enters the condensation unit. The double-helix condenser provides ample heat exchange area, and the temperature regulation device precisely controls its internal temperature to a level that only condenses a large amount of moisture in the flue gas, while retaining sulfur trioxide gas. The smooth quartz glass inner wall greatly reduces the adsorption of sulfur trioxide on the condensation surface. The core of this step is to achieve efficient separation of water vapor while maximizing the retention of sulfur trioxide. Aerosols or gases carrying residual fine impurities finally pass through the precision filter membrane of the filtration interception unit. This ultrafine filter membrane can capture extremely fine particles that may escape from the upstream stage, ensuring the purity of the sample entering the analyzer and preventing subsequent detectors from being contaminated or interfered with. Through the combination of "heating to prevent adsorption" and "precise condensation dehumidification," the adsorption and loss of sulfur trioxide during the sampling pretreatment process are fundamentally solved, greatly improving the accuracy and authenticity of the final analysis results. The multi-stage gradient filtration design, from 10μm to 0.5μm, and then to 0.1-0.3μm, gives the pipeline strong anti-clogging capabilities, enabling it to adapt to complex industrial flue gas environments with high dust and high humidity, ensuring long-term continuous and stable operation.
[0032] Furthermore, the anti-adsorption heating filter sampling unit also includes a high-temperature solenoid valve. Its valve core is made of high-temperature resistant alloy material, withstanding temperatures no lower than 200℃, and has instantaneous on / off capability. Under the command of the automatic control system, the solenoid valve can quickly open or close the sampling airflow channel due to its instantaneous on / off capability. This enables the system to achieve precise timed sampling, for example, injecting samples only at specific times required by the analyzer, avoiding waste or cross-contamination caused by continuous sampling. Since the valve core is made of high-temperature resistant alloy material and can withstand temperatures no lower than 200℃, it can maintain a high-temperature environment basically consistent with the upstream heating pipeline. Therefore, when the high-temperature flue gas flows through this valve, it will not experience local cooling due to contact with the lower-temperature valve body, thereby avoiding sulfur trioxide adsorption and loss at the valve due to condensation or temperature difference, ensuring the integrity of the sample from beginning to end.
[0033] Furthermore, the condensation unit is a gradient condenser, which has multiple nested nickel alloy heat exchange chambers inside. Each chamber is connected to a constant temperature circulating water system with a temperature gradient of 50℃–120℃. This gradient condenser forms a temperature gradient from 120℃ to 50℃ through multiple heat exchange chambers, allowing the moisture in the flue gas to condense and precipitate slowly and gradually according to the temperature range, while sulfur trioxide gas is retained for a longer time. This method effectively avoids the loss of sulfur trioxide due to being wrapped or entrained by water droplets, significantly improving the accuracy of detection. The nickel alloy material is corrosion-resistant and high-temperature resistant, ensuring the long-term stable operation of the equipment in acidic flue gas.
[0034] Furthermore, the filtration and interception unit incorporates a three-layer composite filtration structure, including an upper 5μm PTFE filter, a middle 0.2μm glass fiber membrane, and a lower activated carbon adsorption layer. The device housing is made of acid-resistant Hastelloy alloy. This filtration and interception device achieves high-efficiency purification through its three-layer composite structure. The upper 5μm PTFE filter intercepts larger particles, the middle 0.2μm glass fiber membrane captures fine aerosols and droplets, and the lower activated carbon adsorption layer further adsorbs residual acidic gases and organic matter. The Hastelloy alloy housing is resistant to strong acid corrosion, ensuring long-term stable operation in harsh flue gas environments. Ultimately, it provides the analyzer with extremely high-purity gas samples, ensuring accurate and reliable detection results.
[0035] Furthermore, the anti-adsorption heating filter sampling unit, condensation unit, and filter interception device unit are connected by a retaining ring assembly. The retaining ring has a polytetrafluoroethylene (PTFE) retainer inside, with a temperature resistance range of -200℃ to 260℃, and forms a wedge-shaped plastic seal structure through bolt pre-tightening force. The retaining ring forms a wedge-shaped plastic seal through the internal PTFE retainer and bolt pre-tightening force, which can achieve excellent airtightness at the connection of each unit in high-temperature and highly corrosive environments. The PTFE material has temperature and corrosion resistance, which can effectively prevent the leakage of acidic gases such as sulfur dioxide and sulfur trioxide and the mixing of external air, ensuring the authenticity of the sample. At the same time, it is easy to install and disassemble and easy to maintain.
[0036] Furthermore, the inlet of the high-temperature solenoid valve is directly connected to the high-temperature sampling pipeline of the analyzer, and the outlet is sealed to the inlet of the gradient condenser via a retaining ring assembly. The high-temperature solenoid valve is connected in series between the high-temperature sampling pipeline and the gradient condenser, forming a full-process high-temperature anti-adsorption channel without dead angles. Its high-temperature resistance and instantaneous on / off characteristics can accurately control the sample gas flow rate, which not only avoids the loss of sulfur trioxide adsorption due to condensation at the valve body due to cooling, but also ensures a seamless high-temperature sealed connection with the condensation unit, further improving the accuracy and automation level of the system measurement.
[0037] Furthermore, the outlet of the gradient condenser is sealed to the inlet of the filter interception unit via a retaining ring assembly; the corrosion-resistant retaining ring achieves a fully sealed connection between the gradient condenser and the filter unit, ensuring that the sample gas after condensation and dehumidification completely enters the filter device without leakage or external contamination. The PTFE retaining ring adapts to temperature changes, maintains reliable sealing, avoids sulfur trioxide loss or concentration distortion, and ensures the purity and accuracy of subsequent sample testing.
[0038] Furthermore, the outlet of the filtration and interception unit is connected to the inlet of the sulfur trioxide concentration analyzer. This outlet directly delivers the pure gas sample, which has undergone full-process anti-adsorption, condensation dehumidification, and precision filtration, to the sulfur trioxide analyzer, ensuring that the final detection object fully represents the original flue gas composition. This connection is the final guarantee of the entire pretreatment process, avoiding environmental interference and sample deterioration, and enabling the analyzer to obtain stable, reliable, and accurate sulfur trioxide concentration data.
[0039] It should be noted that the anti-adsorption filtration and condensation device of the sulfur trioxide analyzer in flue gas adopts a top-down integrated structure, which is a key link to ensure the accuracy of analytical data. From top to bottom, it includes a quantitative injection pump 1, a gradient condenser 5, and a filter interception device. The quantitative injection pump 1 is used to quantitatively input high-purity water to clean the inner wall of the condenser tube. The quantitative injection pump 1 is equipped with a three-way solenoid valve combination to control the flow of high-temperature sample gas. The trapezoidal condenser 5, as the core component of the gradient condenser, is used to perform staged condensation of the sample gas. The filter interception device has a built-in precision filter membrane 6 to purify the sample gas collection liquid after condensation. The quantitative injection pump 1, the gradient condenser 5, and the filter interception device are connected by upper and lower pressure rings 4. Both upper and lower pressure rings are equipped with polytetrafluoroethylene condenser sleeves 2. The inlet of the filter interception device is equipped with a filter retainer 12. The bottom of the gradient condenser is equipped with a three-way valve seat 7 at the connection with the filter interception device. The filter outlet has a retainer for fastening the connection with the pipeline. The three-way valve seat 7 is connected to the outlet of the trapezoidal condenser, the air inlet, and the collector inlet, respectively.
[0040] The high-temperature sample gas is first controlled by a syringe pump 1 with a built-in solenoid valve three-way combination, and high-purity water can be injected as needed. Then it enters the gradient condenser 5 for staged condensation and dehumidification. Finally, after being purified by the precision filter membrane 6 in the filtration interception device, it is distributed to the collector or vented by the three-way valve seat 7. Each functional unit is connected by upper and lower pressure rings 4 with PTFE sleeves 2 to achieve high-temperature sealing connection, avoiding the loss of sulfur trioxide at the interface due to leakage or low-temperature adsorption. The three-way valve seat 7 realizes the linkage between the condenser outlet, compressed air inlet, and collector inlet, supporting automated operations such as sampling, backflushing, cleaning, and drying. Therefore, the full-process high-temperature anti-adsorption design and staged condensation technology minimize the loss of sulfur trioxide and ensure the authenticity of the sample. The compact structure integrates sampling, condensation, filtration, and cleaning functions. Automatic control is achieved through solenoid valves and syringe pumps to reduce manual intervention. The overall corrosion-resistant design and multi-stage processing capability are suitable for high dust, high humidity, and strongly acidic flue gas environments.
[0041] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present utility model.
Claims
1. An anti-adsorption filtration and condensation device for a sulfur trioxide analyzer in flue gas, characterized in that, It includes an anti-adsorption heating filter sampling unit, a condensation unit, and a filter interception device unit connected in sequence by pipelines; The anti-adsorption heating filter sampling unit includes a detachable filter chamber and a heating pipe. The detachable filter chamber has a built-in composite filter material with a decreasing pore size gradient. The inner wall of the heating pipe is coated with a polytetrafluoroethylene anti-adsorption coating and is connected to an external temperature control system to maintain the flue gas temperature above the dew point temperature. The condensation unit includes a condenser and a temperature control device. The condenser has a double-helix structure, and the temperature control device is used to control the condensation temperature to achieve moisture separation. The filtration and interception device unit includes a precision filter membrane, which is used to remove residual impurities.
2. The anti-adsorption filtration and condensation device for the sulfur trioxide analyzer in flue gas according to claim 1, characterized in that, The anti-adsorption heating filter sampling unit also includes a high-temperature solenoid valve, the valve core of which is made of high-temperature resistant alloy material.
3. The anti-adsorption filtration and condensation device for the sulfur trioxide analyzer in flue gas according to claim 2, characterized in that, The condensation unit is a gradient condenser, which has multiple nested nickel alloy heat exchange chambers inside, and each chamber is connected to a constant temperature circulating water system.
4. The anti-adsorption filtration and condensation device for the sulfur trioxide analyzer in flue gas according to claim 1, characterized in that, The filter interception device unit has a built-in three-layer composite filter structure, including a PTFE filter, a glass fiber membrane, and an activated carbon adsorption layer that are attached from top to bottom.
5. The anti-adsorption filtration and condensation device for the sulfur trioxide analyzer in flue gas according to claim 1, characterized in that, The anti-adsorption heating filter sampling unit, condensation unit, and filter interception device unit are connected by a retaining ring assembly. The retaining ring has a polytetrafluoroethylene retaining sleeve inside and forms a wedge-shaped plastic sealing structure through bolt pre-tightening force.
6. The anti-adsorption filtration and condensation device for the sulfur trioxide analyzer in flue gas according to claim 3, characterized in that, The inlet of the high-temperature solenoid valve is connected to the high-temperature sampling pipeline of the analyzer, and the outlet of the high-temperature solenoid valve is sealed to the inlet of the gradient condenser through a retaining ring assembly.
7. The anti-adsorption filtration and condensation device for the sulfur trioxide analyzer in flue gas according to claim 6, characterized in that, The outlet of the gradient condenser is sealed to the inlet of the filter interception unit via a retaining ring assembly.
8. The anti-adsorption filtration and condensation device for the sulfur trioxide analyzer in flue gas according to claim 4, characterized in that, The outlet of the filter interception device unit is connected to the inlet of the sulfur trioxide concentration analyzer.
9. The anti-adsorption filtration and condensation device for the sulfur trioxide analyzer in flue gas according to any one of claims 1-8, characterized in that, The device adopts an integrated structure from top to bottom, and includes, in sequence, a quantitative injection pump (1) with an internal solenoid valve three-way combination for switching on and off high-temperature sample gas and injecting high-purity water, a gradient condenser (5) for graded condensation of sample gas, and a filter interception device with an internal precision filter membrane (6) for purifying the sample gas collection liquid after condensation. The quantitative injection pump (1), gradient condenser (5) and filter interception device are connected by upper and lower pressure rings (4). The pressure ring (4) is provided with a polytetrafluoroethylene sleeve (2), and the inlet of the filter interception device is provided with a filter retainer (12). The outlet of the gradient condenser (5) is connected to the air inlet and the collector inlet through a three-way valve seat (7).