A CO seal gas on-line dew point monitoring device

Abstract

This utility model discloses an online dew point monitoring device for CO sealing gas, including a mounting shell; a maintenance door, hinged to one side of the mounting shell and locked to the mounting shell by a lock; a sampling mechanism, installed inside the mounting shell, for conveying and pre-treating CO sealing gas; and a detection mechanism, installed inside the mounting shell, for detecting the CO sealing gas conveyed by the sampling mechanism. The sampling mechanism includes a filter and a gas-liquid separator, which effectively remove particulate matter, liquid water, and oil from the CO sealing gas, preventing impurities from contaminating or corroding the precision components in the subsequent detection mechanism, thus extending the equipment's service life. Simultaneously, the electric pressure regulating valve in the sampling mechanism automatically adjusts the inlet pressure based on the pressure signal fed back from the detection mechanism, ensuring that the gas enters the detection chamber at a stable flow rate and eliminating the interference of pressure fluctuations on dew point measurement.

Description

Technical Field

[0001] This utility model relates to the field of gas measurement technology, specifically to an online dew point monitoring device for CO sealing gas. Background Technology

[0002] The dew point temperature of CO sealing gas (the critical temperature at which water vapor in the gas condenses into liquid water) is a key indicator for measuring its dryness. Exceeding the dew point standard can lead to pipeline corrosion, catalyst poisoning, product defects, or equipment failure. Therefore, it is necessary to monitor and control the dew point within the process requirements in real time. In the existing technology, some gas dew point monitoring devices have not designed a pretreatment structure for the characteristics of CO sealing gas, and cannot effectively filter particulate matter and liquid water in CO sealing gas. When directly detecting, liquid water or particulate matter may cover the sensor's sensitive element, causing false alarms or equipment damage.

[0003] For example, a self-sealing dew point meter (publication number: CN210442289U) includes a front panel, a rear panel, and a sampling chamber. The rear panel has an inlet connector and a quick-connect outlet, while the front panel has a pressure-reducing valve and a float flowmeter. A first pipeline connects the outlet of the inlet connector to the inlet of the pressure-reducing valve; a second pipeline connects the outlet of the pressure-reducing valve to the inlet of the sampling chamber; a third pipeline connects the outlet of the sampling chamber to the inlet of the float flowmeter; and a fourth pipeline connects the outlet of the float flowmeter to the inlet of the quick-connect outlet. A dew point sensor is installed on the sampling chamber. This invention incorporates a self-sealing structure, preventing the backflow of external humidity after testing, preventing moisture condensation on the pipelines and sensor from corroding the components, reducing the time required for purging the pipelines before the experiment and the waste of nitrogen, protecting the pipelines and sensor, improving reaction time, and extending the instrument's lifespan.

[0004] Based on the search of the aforementioned patents and the findings of existing devices, it was discovered that these devices lack a pretreatment structure and cannot effectively filter particulate matter and liquid water in CO sealing gas. Therefore, we need to propose an online dew point monitoring device for CO sealing gas. Utility Model Content

[0005] The purpose of this invention is to provide an online dew point monitoring device for CO sealing gas. By setting up a sampling mechanism, CO sealing gas can be pre-treated before detection, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An online dew point monitoring device for CO sealing gas includes a mounting housing;

[0008] The maintenance door is hinged to one side of the mounting housing and locked in place by a lock.

[0009] The sampling mechanism, installed inside the mounting housing, is used for conveying and pre-treating CO sealing gas;

[0010] The detection mechanism, installed inside the mounting housing, is used to detect the CO sealing gas delivered by the sampling mechanism;

[0011] The reflux mechanism, installed inside the mounting housing, is used to reflux and transport the CO sealing gas after testing.

[0012] The signal processing box is installed on the inner wall of one side of the mounting housing;

[0013] The sampling mechanism includes an air inlet connector, which is installed through the top of the mounting housing. An air inlet pipe is fixedly connected to the bottom of the air inlet connector. A filter for filtering particulate matter inside the CO sealing gas is fixedly connected to the bottom of the air inlet pipe. A gas-liquid separator is fixedly connected to the bottom of the filter. A delivery pipe is fixedly connected to the bottom of the gas-liquid separator. An electric pressure regulating valve is fixedly connected to one end of the delivery pipe. One end of the electric pressure regulating valve is connected to the detection mechanism through a pipe.

[0014] Preferably, the detection mechanism includes a detection box, which is fixedly installed on the inner wall of one side of the mounting shell. A dew point sensor for detecting CO sealing gas is installed through the top of the detection box. A connecting pipe is fixedly connected to one side of the detection box, and one end of the connecting pipe is connected to the reflux mechanism.

[0015] Preferably, the detection mechanism further includes a temperature sensor and a pressure sensor, both of which are installed through the side wall of the detection chamber to detect the temperature and pressure of the CO sealing gas inside the detection chamber.

[0016] Preferably, the reflux mechanism includes a float flow meter, which is fixedly installed at the bottom of the mounting housing. The inlet of the float flow meter is connected to one end of the connecting pipe, and the outlet of the float flow meter is fixedly connected to a reflux pipe. The top of the reflux pipe is fixedly connected to an air outlet connector, which is installed through the top of the mounting housing.

[0017] Preferably, the reflux mechanism further includes a one-way valve, which is fixedly installed on the outer wall of the reflux pipe.

[0018] Preferably, the sampling mechanism further includes an insulating sleeve, which is fitted onto the outer wall of the air intake pipe.

[0019] Preferably, the signal processing box is equipped with a signal conversion module, a data processing module, and a display output module, and the signal conversion module, data processing module, and display output module are all electrically connected to the electric pressure regulating valve, dew point sensor, temperature sensor, pressure sensor, float flow meter, and check valve respectively via wires.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This invention utilizes a sampling mechanism that sequentially incorporates a filter and a gas-liquid separator to effectively remove particulate matter, liquid water, and oil from the CO sealing gas. This prevents impurities from contaminating or corroding precision components in the subsequent testing mechanism, extending the equipment's lifespan. Simultaneously, the electric pressure regulating valve in the sampling mechanism automatically adjusts the inlet pressure based on the pressure signal fed back from the testing mechanism, ensuring that the gas enters the testing chamber at a stable flow rate and eliminating the interference of pressure fluctuations on dew point measurement. Attached Figure Description

[0022] Figure 1 This is a side view of the three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the mounting shell of this utility model;

[0024] Figure 3 This is a schematic diagram of the sampling mechanism, detection mechanism and reflux mechanism of this utility model.

[0025] In the diagram: 1. Mounting housing; 2. Maintenance door; 3. Sampling mechanism; 31. Air inlet connector; 32. Air inlet pipe; 33. Filter; 34. Gas-liquid separator; 35. Delivery pipe; 36. Electric pressure regulating valve; 37. Insulation sleeve; 4. Detection mechanism; 41. Detection box; 42. Dew point sensor; 43. Temperature sensor; 44. Pressure sensor; 45. Connecting pipe; 5. Return mechanism; 51. Float flow meter; 52. Return pipe; 53. Air outlet connector; 54. One-way valve; 6. Signal processing box. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-3 This utility model provides a technical solution:

[0028] A CO sealing gas online dew point monitoring device includes a mounting housing 1;

[0029] Maintenance door 2 is hinged to one side of mounting shell 1 and locked to mounting shell 1 by a lock;

[0030] Sampling mechanism 3, installed inside mounting housing 1, is used for conveying and pre-treating CO sealing gas;

[0031] The detection mechanism 4 is installed inside the mounting housing 1 and is used to detect the CO sealing gas delivered by the sampling mechanism 3.

[0032] The reflux mechanism 5 is installed inside the mounting housing 1 and is used to reflux and transport the CO sealing gas after testing.

[0033] The signal processing box 6 is installed on the inner wall of one side of the mounting housing 1;

[0034] Mounting housing 1 is made of 316L stainless steel in one piece with a thickness of ≥3mm. The inner wall is coated with an anti-static coating. Maintenance door 2 is also made of 316L stainless steel with a thickness of 3mm. The inner side is pasted with 5mm thick sound insulation cotton. The door edge is equipped with an oil-resistant and heat-resistant nitrile rubber sealing ring. The lock is an explosion-proof cylindrical lock with a specially designed triangular key.

[0035] In an optional embodiment: the sampling mechanism 3 includes an air inlet connector 31, which is installed through the top of the mounting housing 1. The bottom of the air inlet connector 31 is fixedly connected to an air inlet pipe 32. The bottom of the air inlet pipe 32 is fixedly connected to a filter 33 for filtering particulate matter inside the CO sealing gas. The bottom of the filter 33 is fixedly connected to a gas-liquid separator 34. The bottom of the gas-liquid separator 34 is fixedly connected to a conveying pipe 35. One end of the conveying pipe 35 is fixedly connected to an electric pressure regulating valve 36. One end of the electric pressure regulating valve 36 is connected to the detection mechanism 4 through a pipe.

[0036] It should be noted that the air inlet connector 31 is a double-ferrule type connector made of 316L stainless steel, with a nominal diameter of 10mm and a maximum working pressure of 16MPa. An explosion-proof sealing gasket is provided at the connection between the connector and the mounting housing 1. The air inlet pipe 32 is a Φ8×1mm seamless 316L stainless steel pipe. The filter 33 has a cylindrical structure with a housing made of 316L stainless steel and contains three filter elements: a 5μm sintered metal filter element, a 1μm glass fiber filter element, and a 0.1μm polytetrafluoroethylene filter element. Each filter element can be individually removed and replaced. Differential pressure gauges are installed at the filter inlet and outlet; when the pressure difference exceeds 0.1MPa, the filter element needs to be replaced. The gas-liquid separator 34 adopts a centrifugal separation structure with a separation efficiency ≥99.5% and a processing flow range of 0.5-5m³ / h. 3 / h, with an automatic drain valve at the bottom. The drain valve is a pneumatic diaphragm valve, model BURKERT2030, which can control the drainage through a liquid level sensor. The material of the conveying pipe 35 is the same as that of the air inlet pipe 32. The electric pressure regulating valve 36 is model SAMSON 3277, with a nominal diameter of DN10, a rated flow coefficient Kv=0.6, an adjustment accuracy of ±0.5%, and an operating temperature of -40~150℃.

[0037] In an optional embodiment: the detection mechanism 4 includes a detection box 41, which is fixedly installed on the inner wall of one side of the mounting shell 1. A dew point sensor 42 for detecting CO sealing gas is installed through the top of the detection box 41. A connecting pipe 45 is fixedly connected to one side of the detection box 41, and one end of the connecting pipe 45 is connected to the return mechanism 5.

[0038] It should be noted that the testing box 41 has a cubic structure, is made of 316L stainless steel, has a wall thickness of 3mm, and is wrapped with 5mm thick heat insulation cotton on the outer wall. The dew point sensor 42 (refers to the dew point sensor in the existing technology CN210442289U, and its working principle is the same as the existing technology) has its sensor probe inserted into the center of the testing box 41. The connection between the sensor and the testing box 41 adopts an explosion-proof sealing structure. The connecting pipe 45 is made of 316L stainless steel and has a nominal diameter of 6mm.

[0039] A temperature-controlled PTC heating element can be optionally installed on one side of the detection box 41 to prevent condensation on the sensor and improve response speed.

[0040] In an optional embodiment, the detection mechanism 4 further includes a temperature sensor 43 and a pressure sensor 44, both of which are installed through the side wall of the detection chamber 41 to detect the temperature and pressure of the CO sealing gas inside the detection chamber 41.

[0041] It should be noted that the temperature sensor 43 is model PT100, with Class A accuracy, a measurement range of -50 to 150℃, and an error of ±0.15℃ (0 to 100℃). The sensor probe is flush with the inner wall of the detection chamber 41. The pressure sensor 44 is model HONEYWELLASDX series, with a measurement range of 0 to 1MPa, an accuracy of ±0.25%FS, and an output signal of 4 to 20mA.

[0042] In an optional embodiment: the reflux mechanism 5 includes a float flow meter 51, which is fixedly installed at the bottom of the mounting housing 1. The inlet of the float flow meter 51 is connected to one end of the connecting pipe 45, and the outlet of the float flow meter 51 is fixedly connected to a reflux pipe 52. The top of the reflux pipe 52 is fixedly connected to an air outlet connector 53, which is installed through the top of the mounting housing 1.

[0043] It should be noted that the float flowmeter 51 (refers to the dew point sensor in the existing technology CN210442289U, and its working principle is the same as the existing technology), the return pipe 52 is made of the same material as the air inlet pipe 32, and the air outlet connector 53 has the same structure as the air inlet connector 31.

[0044] In an optional embodiment, the reflux mechanism 5 further includes a one-way valve 54, which is fixedly mounted on the outer wall of the reflux pipe 52.

[0045] It should be noted that the one-way valve 54 is model SWAGELOK SS-4CK-1, made of 316L stainless steel, with an opening pressure of 0.02MPa and a sealing pressure of 10MPa. The flow direction is from the float flowmeter 51 to the outlet connector 53. The one-way valve 54 can effectively prevent gas backflow, avoid interference with the gas state in the detection chamber 41, and ensure the stability of the detection process.

[0046] In an optional embodiment, the sampling mechanism 3 further includes an insulating sleeve 37, which is fitted onto the outer wall of the air intake pipe 32.

[0047] It should be noted that the insulation sleeve 37 has a double-layer structure, with an inner layer of electric heating wire and an outer layer of insulation cotton. The heating power is 20W / m, and the temperature control range is 50~80℃, which can be adjusted by a temperature controller. The electric heating insulation sleeve can prevent the gas in the air inlet pipe 32 from condensing due to the temperature drop, avoid liquid water from entering the subsequent processing and testing stages, ensure the original state of the gas, and improve the accuracy of dew point measurement.

[0048] In an optional embodiment: a signal conversion module, a data processing module, and a display output module are fixedly installed inside the signal processing box 6, and the signal conversion module, the data processing module, and the display output module are all electrically connected to the electric pressure regulating valve 36, the dew point sensor 42, the temperature sensor 43, the pressure sensor 44, the float flow meter 51, and the one-way valve 54 respectively via wires.

[0049] It should be noted that the signal conversion module uses a MOXA MGate5105, which can convert the 4-20mA analog signal output from the sensor into a digital signal with a conversion accuracy of 16 bits. The data processing module uses a Siemens S7-1214C PLC with a CPU frequency of 100MHz, supporting communication protocols such as Modbus and Profinet. The display output module uses a Weintek MT8102iE touch screen, a 10.1-inch color display with a resolution of 1024×600, which can display real-time data, historical curves, and alarm information. The data processing module has built-in temperature compensation and pressure correction algorithms, which are used to compensate for the dew point measurement value in real time based on the data from temperature sensor 43 and pressure sensor 44. The 16-bit precision signal conversion module ensures the accuracy of sensor signal conversion. The high-performance PLC, as the data processing module, has a fast processing speed and can process a large amount of detection data and implement complex control logic in a timely manner. The large-size touch screen display output module has a user-friendly interface, which makes it easy for operators to intuitively understand the device's operating status and detection data. The electrical connections between the modules realize the automated control of the device and the real-time transmission and display of data.

[0050] Working principle: When this utility model is in use, CO sealing gas enters the device through the top air inlet connector 31, flows through the air inlet pipe 32 wrapped by the heat insulation sleeve 37 to reduce the interference of ambient temperature, and the gas passes through the filter 33 (removing particulate matter) and the gas-liquid separator 34 (separating liquid water and oil) in sequence to ensure that the gas entering the detection mechanism 4 is clean and dry.

[0051] The pretreated gas flows through the delivery pipeline 35 to the electric pressure regulating valve 36. The valve body automatically adjusts the opening according to the pressure signal fed back by the detection mechanism 4, so that the gas enters the detection box 41 at a stable pressure. After the gas enters the detection box 41, the dew point sensor 42 detects the water vapor condensation temperature in real time and transmits the signal to the signal processing box 6.

[0052] Temperature sensor 43 and pressure sensor 44 synchronously monitor the temperature and pressure of the gas inside detection chamber 41. The data is used to correct the dew point measurement value and eliminate environmental interference. After detection, the gas enters the float flow meter 51 through the connecting pipe 45. The flow meter measures the gas flow rate in real time and feeds the signal back to the signal processing box 6. After passing through the one-way valve 54 (to prevent backflow), the gas returns to the process system through the return pipe 52 and the top gas outlet connector 53, realizing a zero-emission closed-loop cycle. The signal conversion module in the signal processing box 6 receives sensor signals such as dew point, temperature, pressure, and flow rate and converts them into digital quantities. The data processing module performs fusion analysis on multiple parameters according to a preset algorithm, calculates the corrected dew point value, and displays it locally through the display output module (such as a touch screen or indicator light). At the same time, it is uploaded to the DCS / PLC system for remote monitoring. According to the dew point or pressure threshold, the signal processing box 6 outputs a control signal to the electric pressure regulating valve 36 to dynamically adjust the sampling pressure and ensure detection stability.

[0053] Summary of core logic

[0054] Pretreatment → Voltage regulation detection → Temperature and pressure compensation → Flow closed loop → Intelligent output;

[0055] Through multi-stage filtration, dynamic pressure stabilization, multi-parameter compensation, and closed-loop reflux design, the CO sealing gas dew point can be monitored in real time, accurately, and reliably, while ensuring the safe and energy-saving operation of the system.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CO seal gas on-line dew point monitoring device, characterized by, Includes mounting housing (1); The maintenance door (2) is hinged to one side of the mounting shell (1) and locked to the mounting shell (1) by a lock; The sampling mechanism (3) is installed inside the mounting housing (1) and is used for conveying and pre-treating CO sealing gas; The detection mechanism (4) is installed inside the mounting housing (1) and is used to detect the CO sealing gas delivered by the sampling mechanism (3); The reflux mechanism (5) is installed inside the mounting housing (1) and is used to reflux and transport the CO sealing gas after detection. The signal processing box (6) is installed on the inner wall of one side of the mounting housing (1); The sampling mechanism (3) includes an air inlet connector (31), which is installed through the top of the mounting shell (1). The bottom of the air inlet connector (31) is fixedly connected to an air inlet pipe (32). The bottom of the air inlet pipe (32) is fixedly connected to a filter (33) for filtering particulate matter inside the CO sealing gas. The bottom of the filter (33) is fixedly connected to a gas-liquid separator (34). The bottom of the gas-liquid separator (34) is fixedly connected to a conveying pipe (35). One end of the conveying pipe (35) is fixedly connected to an electric pressure regulating valve (36). One end of the electric pressure regulating valve (36) is connected to the detection mechanism (4) through a pipe.

2. The CO sealing gas online dew point monitoring device according to claim 1, characterized in that: The detection mechanism (4) includes a detection box (41), which is fixedly installed on the inner wall of one side of the mounting shell (1). A dew point sensor (42) for detecting CO sealing gas is installed through the top of the detection box (41). A connecting pipe (45) is fixedly connected to one side of the detection box (41), and one end of the connecting pipe (45) is connected to the reflux mechanism (5).

3. The CO sealing gas online dew point monitoring device according to claim 2, characterized in that: The detection mechanism (4) also includes a temperature sensor (43) and a pressure sensor (44), both of which are installed through the side wall of the detection chamber (41) to detect the temperature and pressure of the CO sealing gas inside the detection chamber (41).

4. The CO sealing gas online dew point monitoring device according to claim 2, characterized in that: The return mechanism (5) includes a float flow meter (51), which is fixedly installed at the bottom of the mounting housing (1). The inlet of the float flow meter (51) is connected to one end of the connecting pipe (45), and the outlet of the float flow meter (51) is fixedly connected to a return pipe (52). The top of the return pipe (52) is fixedly connected to an air outlet connector (53), which is installed through the top of the mounting housing (1).

5. A CO seal gas on-line dew point monitoring device according to claim 4, characterized in that: The reflux mechanism (5) also includes a one-way valve (54), which is fixedly installed on the outer wall of the reflux pipe (52).

6. The CO seal gas on-line dew point monitoring device according to claim 1, characterized in that: The sampling mechanism (3) also includes an insulation sleeve (37), which is fitted onto the outer wall of the air inlet pipe (32).

7. The CO sealing gas online dew point monitoring device according to claim 5, characterized in that: The signal processing box (6) is fixedly installed with a signal conversion module, a data processing module and a display output module. The signal conversion module, the data processing module and the display output module are all electrically connected to the electric pressure regulating valve (36), the dew point sensor (42), the temperature sensor (43), the pressure sensor (44), the float flow meter (51) and the one-way valve (54) respectively through wires.

Images