A pretreatment system applied to combustible gas concentration analyzer at RTO inlet

Abstract

The utility model relates to RTO gas monitoring field, solved the problem that the prior art is easy to appear gas component interference and influence combustible gas concentration analyser accuracy, especially relate to a kind of application in the pretreatment system of RTO entrance combustible gas concentration analyser, including the first pretreatment system for filtering liquid in process gas and the second pretreatment system for detecting process gas and discharging, the first pretreatment system includes coalescer for purifying process gas, the input interface of coalescer is connected with gas inlet pipe one, one end of gas inlet pipe one is connected with sample gas inlet and is provided, the output interface of coalescer is connected with gas outlet pipe one, gas outlet pipe one is equipped with three-way valve for realizing different gas flow path switching and control, three-way valve is provided with communication pipe one. The utility model reduces operation and maintenance cost, improves measurement accuracy, enhances the reliability and anti-risk ability of entire pretreatment system, and simultaneously makes the flow of process gas more stable.

Description

Technical Field

[0001] This utility model relates to the field of RTO gas monitoring, and in particular to a pretreatment system for use in an RTO inlet combustible gas concentration analyzer. Background Technology

[0002] In the safe and stable operation of an RTO (Regenerative Thermal Oxidizer), the inlet combustible gas concentration analyzer is the core monitoring device, and its measurement accuracy directly determines whether various safety risks can be effectively avoided. However, the flue gas at the RTO inlet often exhibits extreme operating conditions such as high temperature, high dust, high humidity, and the presence of corrosive media. If it directly enters the analyzer, it can lead to sensor poisoning, blockage, damage, or measurement drift. Therefore, a pretreatment system is often installed to process the complex flue gas into a clean, dry sample gas at a suitable temperature, ensuring the long-term reliable operation of the analyzer. However, existing pretreatment systems are prone to gas composition interference, leading to significant measurement deviations and affecting the accuracy of the combustible gas concentration analyzer. Furthermore, the poor stability of the gas flow rate may also affect the concentration measurement results. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a pretreatment system for a combustible gas concentration analyzer at the RTO inlet. This system solves the technical problem that gas composition interference can easily affect the accuracy of the combustible gas concentration analyzer, thereby improving the measurement accuracy of the combustible gas concentration analyzer.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a pretreatment system for a combustible gas concentration analyzer at the inlet of an RTO, comprising a first pretreatment system for filtering liquids in process gas and a second pretreatment system for detecting and discharging process gas; The first pretreatment system includes a coalescer for purifying process gas. The input interface of the coalescer is connected to an inlet pipe, one end of which is connected to a sample gas inlet. The output interface of the coalescer is connected to an outlet pipe, and a three-way valve for switching and controlling different gas flow paths is installed on the outlet pipe. A connecting pipe is provided on the three-way valve. The second pretreatment system includes an instrumentation chamber for real-time monitoring of key characteristics of the process gas and a rotor flowmeter for flow monitoring and stable control of the tested process gas. The input interface of the instrumentation chamber is connected to one end of the connecting pipe one, and the output interface of the instrumentation chamber is connected to an outlet pipe two. The rotor flowmeter is equipped with a sample gas adjustment knob that is connected to the outlet pipe two and used to achieve precise control of the sample gas flow. The output interface of the rotor flowmeter is connected to the connecting pipe two.

[0005] Furthermore, the second pretreatment system also includes a jet pump for providing stable suction force for the entire process airflow path. The input interface of the jet pump is connected to one end of the connecting pipe 2. The jet pump is equipped with a pressure reducing valve for ensuring its operational stability through precise pressure control. The input interface of the jet pump is connected to an air pipe, and one end of the air pipe is equipped with a compressed air inlet.

[0006] Furthermore, the output interface of the injection pump is connected to an exhaust pipe, and a shut-off valve connected to the connecting pipe is installed on the exhaust pipe. One end of the exhaust pipe is connected to an exhaust outlet.

[0007] Furthermore, the jet pump is also connected to a second drain pipe, one end of which is connected to a drain outlet.

[0008] Furthermore, the coalescer is also connected to a drain pipe, on which a drain valve is installed, and one end of the drain pipe is connected to a wastewater discharge port.

[0009] Furthermore, the three-way valve is also equipped with an air inlet pipe two, one end of which is connected to a standard gas inlet.

[0010] By employing the above technical solution, this utility model provides a pretreatment system for use in an RTO inlet combustible gas concentration analyzer, which has at least the following beneficial effects: 1. This utility model, through a first pretreatment system and then a second pretreatment system, can intercept liquid components in process gas, reducing the harm of liquid to subsequent pretreatment units and analyzers from the source. This reduces maintenance costs, improves measurement accuracy, enhances the reliability and risk resistance of the entire pretreatment system, stabilizes the flow rate of process gas, and ensures safe and compliant emission of exhaust gas after testing. It also guarantees the detection accuracy and service life of the analyzer and reduces the risk of safety misjudgments.

[0011] 2. This utility model, by introducing standard gas into the instrument testing chamber, can perform functional verification, accuracy calibration, and fault diagnosis of the instrument testing chamber, ensuring the reliability and accuracy of the entire sample gas testing link, avoiding the risk of RTO backfire and explosion caused by analyzer misjudgment, verifying that the pretreatment system is leak-free and pollution-free, and ensuring that the process gas detection values ​​are true and valid. At the same time, in conjunction with a rotor flow meter, it can assist in adjusting the flow rate to a stable range, providing flow path guarantee for the accurate detection of the instrument testing chamber and the normal operation of the subsequent exhaust gas treatment unit. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1This is a schematic diagram of the pretreatment system of this utility model.

[0013] In the diagram: 1. First pretreatment system; 11. Coalescer; 12. Inlet pipe 1; 13. Inlet pipe 2; 14. Outlet pipe 1; 15. Three-way valve; 16. Connecting pipe 1; 17. Drain pipe 1; 18. Drain valve; 2. Second pretreatment system; 21. Instrument testing chamber; 22. Rotor flow meter; 23. Second outlet pipe; 24. Sample gas adjustment knob; 25. Second connecting pipe; 26. Jet pump; 27. Pressure reducing valve; 28. Air pipe; 29. ​​Shut-off valve; 3. Exhaust pipe; 4. Drain pipe 2. Detailed Implementation

[0014] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. This will allow for a full understanding and implementation of how this application uses technical means to solve technical problems and achieve technical effects.

[0015] In practical applications of RTO inlet combustible gas concentration analyzers, a pretreatment system is typically installed to handle complex flue gas. However, this pretreatment system, due to the need to cope with extreme conditions such as high temperature, high dust, high humidity, and corrosive media, is prone to gas composition interference. These problems not only lead to analyzer measurement distortion and significant measurement deviations, but also necessitate measures to improve the accuracy of the combustible gas concentration analyzer and enhance the stability of gas flow. Figure 1 As shown, this embodiment proposes a pretreatment system for a combustible gas concentration analyzer at the RTO inlet. This pretreatment system is integrated into the housing, allowing the entire system to be installed around the analyzer for convenient pretreatment of process gas. It includes a first pretreatment system 1 for filtering liquids from the process gas and a second pretreatment system 2 for detecting and discharging the process gas. The first pretreatment system 1 intercepts liquid components, reducing the harm of liquids to subsequent pretreatment units and the analyzer from the source. This reduces maintenance costs, improves measurement accuracy, and enhances the reliability and resilience of the entire pretreatment system. The second pretreatment system 2 then receives the process gas treated by the first system, stabilizes the gas flow rate, and delivers it to the analyzer for detection. After detection, the gas is discharged.

[0016] Specifically, the first pretreatment system 1 includes a coalescer 11 for purifying process gas. The filter element of the coalescer 11 can be made of a hydrophobic material to efficiently remove liquid components from the process gas while preventing the filter element from being wetted and clogged by the liquid components. This ensures the long-term stable operation of the coalescer 11, providing clean process gas with low liquid load for subsequent pretreatment units and analyzers, thereby ensuring the stability of the subsequent system and reducing the overall risk of failure. The input interface of the coalescer 11 is connected to an inlet pipe 12, and one end of the inlet pipe 12 is connected to a sample gas inlet 13. The process gas enters the inlet pipe 12 through the sample gas inlet 13. The process gas can be kept flowing steadily into the coalescer 11 for purification. The output interface of the coalescer 11 is connected to an outlet pipe 14. The purified and filtered process gas enters the outlet pipe 14 from the coalescer 11. A three-way valve 15 is installed on the outlet pipe 14 to realize the switching and control of different gas flow paths. The three-way valve 15 can control the flow of process gas in the outlet pipe 14. A connecting pipe 16 is provided on the three-way valve 15, which is connected to the input interface of the instrument detection chamber 21 of the second pretreatment system 2, so that the purified and filtered process gas can enter the instrument detection chamber 21.

[0017] Furthermore, the coalescer 11 is also connected to a drain pipe 17, on which a drain valve 18 is installed. This drain valve 18 is installed to promptly and controllably discharge the liquid substance intercepted and coalesced by the coalescer 11 into the system, preventing the accumulation of liquid substance in the coalescer 11 that could lead to decreased separation efficiency, system blockage, or secondary pollution. The drain valve 18 can also control the timing and flow rate of liquid substance discharge, ensuring system stability. A wastewater discharge port is connected to one end of the drain pipe 17. When the drain valve 18 is opened, the accumulated liquid substance is discharged through the wastewater discharge port. The three-way valve 15 is also equipped with an air inlet pipe 13, one end of which is connected to a standard gas inlet. This allows for functional verification, accuracy calibration, and fault diagnosis of the instrument detection chamber 21 downstream of the coalescer 11, ensuring the reliability and accuracy of the entire sample gas detection chain. This avoids the risk of RTO backfire or explosion caused by analyzer misjudgment, verifies that the pretreatment system is leak-free and pollution-free, and ensures that the process gas detection values ​​are true and valid.

[0018] Specifically, to provide clean, stable, and suitable sample gas for the combustible gas concentration analyzer and to ensure the safe and compliant emission of the exhaust gas after testing, the second pretreatment system 2 includes an instrumentation chamber 21 for real-time monitoring of key characteristics of the process gas and a rotor flowmeter 22 for flow monitoring and stabilization control of the tested process gas. The instrumentation chamber 21 can measure the concentration of combustible gas in the RTO inlet process gas in real time, ensuring that the data accurately reflects the actual operating conditions. When the concentration approaches or exceeds the safety threshold, an alarm is triggered to prevent backfire and explosion accidents. The rotor flowmeter 22 can assist in adjusting the flow rate to a stable range, providing flow path assurance for accurate detection by the instrumentation chamber 21 and the normal operation of the subsequent exhaust gas treatment unit. To ensure stable measurement, the input interface of the instrument detection chamber 21 is connected to one end of the connecting pipe 16, and the output interface of the instrument detection chamber 21 is connected to the outlet pipe 23. The rotor flowmeter 22 is equipped with a sample gas adjustment knob 24, which is connected to the outlet pipe 23 and used to achieve precise control of the sample gas flow rate. The sample gas adjustment knob 24 can change the valve core opening to adjust the cross-sectional area of ​​the pipeline, thereby controlling the sample gas flow rate entering the rotor flowmeter 22. For example, in the detection of combustible gas concentration at the RTO inlet, the flow rate can be stabilized within the optimal range required by the instrument, ensuring that the float of the rotor flowmeter 22 is stable within the target scale range, providing the required sample gas flow rate conditions for subsequent detection. The output interface of the rotor flowmeter 22 is connected to the connecting pipe 25.

[0019] Furthermore, due to the low and unstable process gas pressure, the second pretreatment system 2 also includes an ejector pump 26 for providing stable suction force to the entire process gas flow path. The ejector pump 26 is driven by compressed air to form negative pressure, providing stable suction force to the entire process gas flow path and assisting in gas delivery, exhaust gas treatment, or system protection. The ejector pump 26 is equipped with a pressure reducing valve 27 for ensuring its operational stability through precise pressure control, and an air pipe 28 is connected to the input interface of the ejector pump 26. One end of the air pipe 28 is equipped with a compressed air inlet, which can provide a stable and controllable power source for the ejector pump 26, driving it to achieve negative pressure suction force and gas delivery function, while also adapting to the safety and stability of the RTO inlet combustible gas concentration monitoring system. To meet operational requirements, the output interface of the jet pump 26 is connected to an exhaust pipe 3. A shut-off valve 29, which is connected to a connecting pipe 25, is installed on the exhaust pipe 3. One end of the exhaust pipe 3 is connected to an exhaust outlet. When the system is in the normal detection state of the RTO inlet process gas, the jet pump 26 needs to mix the process gas monitored by the rotor flow meter 22 with compressed air and discharge it through the exhaust pipe 3 and the exhaust outlet. The jet pump 26 is also connected to a drain pipe 4. One end of the drain pipe 4 is connected to a drain outlet, which can promptly discharge liquid substances such as condensate, incompletely separated oil mist, and residual liquid droplets of process gas generated or accumulated during the operation of the jet pump 26, so as to avoid negative impacts on the function of the jet pump 26, downstream pipelines, and system safety.

[0020] The process gas enters the pretreatment system through the sample gas inlet via the inlet pipe 12, then flows into the coalescer 11. After filtration, the process gas passes through the filter element of the coalescer 11 and enters the instrument detection chamber 21 for measurement via the outlet pipe 14, the three-way valve 15, and the connecting pipe 16. Simultaneously, the liquid in the process gas is blocked outside the filter element and condenses into small water droplets under gravity, flowing into the cavity of the coalescer 11. The liquid is discharged through the drain pipe 17, the drain valve 18, and the wastewater discharge port. After being detected by the instrument detection chamber 21, the process gas enters the rotor flowmeter 22 through the outlet pipe 23. The flow rate of the process gas entering the instrument detection chamber 21 is controlled by adjusting the rotor flowmeter 22. Finally, the process gas and compressed air are discharged from the pretreatment system together through the exhaust pipe 3.

[0021] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Since the above embodiments are substantially similar to the method embodiments, their descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0022] The above embodiments provide a detailed description of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A pre-processing system applied to a combustible gas concentration analyzer at an RTO inlet, characterized by, It includes a first pretreatment system (1) for filtering liquids in process gas and a second pretreatment system (2) for detecting and discharging process gas. The first pretreatment system (1) includes a coalescer (11) for purifying process gas. The input interface of the coalescer (11) is connected to an inlet pipe (12). One end of the inlet pipe (12) is connected to a sample gas inlet. The output interface of the coalescer (11) is connected to an outlet pipe (14). A three-way valve (15) for switching and controlling different gas flow paths is installed on the outlet pipe (14). A connecting pipe (16) is provided on the three-way valve (15). The second pretreatment system (2) includes an instrument detection chamber (21) for real-time monitoring of key characteristics of process gas and a rotor flow meter (22) for flow monitoring and stable control of the detected process gas. The input interface of the instrument detection chamber (21) is connected to one end of the connecting pipe (16). The output interface of the instrument detection chamber (21) is connected to the outlet pipe (23). The rotor flow meter (22) is equipped with a sample gas adjustment knob (24) that is connected to the outlet pipe (23) and used to achieve precise control of sample gas flow. The output interface of the rotor flow meter (22) is connected to the connecting pipe (25).

2. The pre-treatment system for use in a combustible gas concentration analyzer at the inlet of an RTO according to claim 1, characterized in that, The second pretreatment system (2) also includes a jet pump (26) for providing stable suction force for the entire process airflow path. The input interface of the jet pump (26) is connected to one end of the connecting pipe (25). The jet pump (26) is equipped with a pressure reducing valve (27) for ensuring its operational stability through precise pressure control. The input interface of the jet pump (26) is connected to an air pipe (28), and one end of the air pipe (28) is equipped with a compressed air inlet.

3. The pre-treatment system for use in a combustible gas concentration analyzer at the inlet of an RTO according to claim 2, characterized in that, The output interface of the jet pump (26) is connected to an exhaust pipe (3), and a shut-off valve (29) connected to the connecting pipe (25) is installed on the exhaust pipe (3). One end of the exhaust pipe (3) is connected to an exhaust outlet.

4. A pretreatment system for a combustible gas concentration analyzer at the inlet of an RTO, as described in claim 2, is characterized in that, The jet pump (26) is also connected to a drain pipe (4), and one end of the drain pipe (4) is connected to a drain outlet.

5. A pretreatment system for a combustible gas concentration analyzer at the inlet of an RTO, as described in claim 1, characterized in that, The coalescer (11) is also connected to a drain pipe (17), on which a drain valve (18) is installed, and one end of the drain pipe (17) is connected to a wastewater discharge port.

6. The pretreatment system for a combustible gas concentration analyzer at the inlet of an RTO according to claim 1, characterized in that, The three-way valve (15) is also provided with an air inlet pipe two (13), one end of which is connected to a standard gas inlet.

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