Double reactor oxygen concentration time-sharing monitoring device

Abstract

This utility model relates to the technical field of chemical process monitoring equipment, specifically a time-sharing oxygen concentration monitoring device for dual reactors. It has two symmetrically distributed sampling branches, each equipped with a reactor. A common gas path module is located outside the sampling branches, including three-way solenoid valves V1 and V2, a main solenoid valve VT, and purge gas systems connecting V1, V2, and VT respectively. The main solenoid valve VT is also connected to an oxygen analyzer. This utility model mainly achieves pollution-free switching monitoring of two reactors by a single oxygen analyzer through a symmetrical three-way valve group and a positive pressure isolation structure, reducing equipment investment and operation and maintenance costs, improving instrument lifespan and analytical efficiency, and simultaneously reducing the probability of direct equipment damage.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical process monitoring equipment, specifically a time-division monitoring device for oxygen concentration in a dual-reactor system. Background Technology

[0002] In the field of batch chemical production, the production process often uses reaction vessels to convert raw materials into products. The monitoring of oxygen content in the vessel is particularly stringent, and online oxygen analyzers are usually required for real-time monitoring. Among the many types of oxygen analyzers, electrochemical oxygen analyzers are widely used in the production process of this product due to their small size, compact structure, low operating and maintenance costs, fast response speed, and good low concentration measurement capability.

[0003] However, due to its poor corrosion resistance to strong acid and alkali systems, and the fact that the core of the electrochemical oxygen analyzer's sensor is the consumable electrolyte and electrode materials, the electrolyte will be depleted or its performance will degrade as the usage time or the total amount of target gas exposed increases. The electrodes will age or become contaminated, leading to decreased sensitivity, zero drift, and slower response. These are the main reasons for the short service life or damage of the oxygen analyzer.

[0004] The traditional method involves directly connecting the oxygen analyzer to the gas phase space of the reactor via a sampling pipeline. This method lacks protection for the analytical components and causes ineffective wear and tear on the oxygen analyzer during non-detection periods. When two reactors need to independently monitor oxygen concentration, the traditional solution requires two oxygen analyzers, doubling the equipment cost. Furthermore, when a single analyzer switches between monitoring two reactors, there is a risk of cross-contamination with ordinary valves (residual gas can cause measurement deviations of >5%). At the same time, pressure fluctuations in the reactor can easily cause material backflow, damaging the analyzer's detection components.

[0005] To address the aforementioned problems, this invention provides a time-division monitoring device for oxygen concentration in dual reaction vessels. Summary of the Invention

[0006] The purpose of this invention is to provide a time-division monitoring device for oxygen concentration in dual reactors to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a dual-reactor oxygen concentration time-sharing monitoring device, which has two symmetrically distributed sampling branches, and each sampling branch is equipped with a reactor;

[0008] A common gas path module is installed outside the sampling branch to provide three-level gas path isolation for the entire device;

[0009] The common gas path module includes three-way solenoid valves V1 and V2, which are respectively installed on the two sampling branches and connected to the reactor, a main solenoid valve VT that controls V1 and V2, and a purge gas system that connects V1, V2 and VT respectively.

[0010] The main solenoid valve VT is also connected to an oxygen analyzer.

[0011] In a more optimized configuration, the two reactors are connected to ports A of the three-way solenoid valves V1 and V2, respectively, and port A of the main solenoid valve VT is connected to ports B of V1 and V2. The purging gas system is connected to ports C of V1 and V2.

[0012] In a more optimized configuration, the purge gas system is connected to port C of the main solenoid valve VT, and the oxygen analyzer is connected to port B of the main solenoid valve VT.

[0013] Ideally, the two sampling branches are symmetrically distributed at a 120° angle, with a branch length deviation of ≤5%.

[0014] Ideally, both sampling branches are made of Φ8 stainless steel sampling tubes.

[0015] In a more optimized configuration, the three ports of the three-way solenoid valves V1 and V2 and the main solenoid valve VT are all normally closed, and the valve cores are made of PTFE sealing material.

[0016] Ideally, the common pipeline volume from port A of the main solenoid valve VT to the oxygen analyzer inlet is 30±5mL.

[0017] Ideally, the purge gas inlet pressure is 1.2-1.5 times the maximum operating pressure of the reactor to form a continuous positive pressure barrier.

[0018] In a more optimized manner, the nitrogen source pressure setting of the purging gas system is 0.1~0.5MPa, which is more than 0.05MPa higher than the maximum operating pressure of the reactor.

[0019] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0020] This invention features two Φ8 stainless steel sampling tubes symmetrically distributed at a 120° angle, which reduces dead volume. At the same time, it ensures the independence of each gas path through three-stage gas path isolation, thereby enabling a single oxygen analyzer to monitor two reactors without contamination, reducing costs and improving analysis efficiency.

[0021] This invention features an anti-backflow structure that uses a purging gas system to create a continuous positive pressure barrier to prevent gas backflow in the gas path.

[0022] This utility model mainly uses a symmetrical three-way valve group and a positive pressure isolation structure to achieve pollution-free switching monitoring of two reaction vessels by a single oxygen analyzer, thereby reducing equipment investment and operation and maintenance costs, improving instrument lifespan and analysis efficiency, and reducing the probability of direct equipment damage. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of Example 1;

[0024] Figure 2 This is the overall flowchart of Example 1.

[0025] Among them, 1. purge gas system; 2. flow distributor; 3. three-way solenoid valve V1; 4. three-way solenoid valve V2; 5. main solenoid valve VT; 6. oxygen analyzer; 7. reactor A; 8. reactor B. 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] This invention provides a time-division monitoring device for oxygen concentration in a dual-reactor system, which has two symmetrically distributed sampling branches, such as... Figure 1 and Figure 2 As shown, each sampling branch is equipped with a reaction vessel, designated as reaction vessel A and reaction vessel B. A common gas path module is installed outside each sampling branch to provide three-stage gas path isolation for the entire device. The common gas path module includes three-way solenoid valves V1 and V2, respectively connected to the reaction vessels on the two sampling branches; a main solenoid valve VT that controls both V1 and V2; and purge gas systems connecting V1, V2, and VT. An oxygen analyzer is also connected to the main solenoid valve VT.

[0028] This structure enables a single oxygen analyzer to monitor two reactors without contamination.

[0029] like Figure 2 As shown, the two reactors are connected to ports A of the three-way solenoid valves V1 and V2 respectively, port A of the main solenoid valve VT is connected to ports B of V1 and V2, the purge gas system is connected to ports C of V1 and V2, the purge gas system is connected to port C of the main solenoid valve VT, and the oxygen analyzer is connected to port B of the main solenoid valve VT.

[0030] In this invention, the common pipeline volume from port A of the main solenoid valve VT to the oxygen analyzer inlet is 30±5mL. All three ports of the three-way solenoid valves V1 and V2, and the main solenoid valve VT, are normally closed, and the valve cores are made of PTFE sealing material.

[0031] In addition, the two sampling branches are symmetrically arranged, that is, two Φ8 stainless steel sampling tubes are symmetrically distributed at a 120° angle, and the branch length deviation is ≤5%, thereby reducing the dead volume.

[0032] This invention uses a purge gas system to create a positive pressure barrier to prevent backflow. The inlet pressure of the purge gas system is set to 1.2 to 1.5 times the maximum operating pressure of the reactor. Specifically, the nitrogen source pressure is set to 0.1 to 0.5 MPa, which is at least 0.05 MPa higher than the maximum operating pressure of the reactor. A flow distributor is also installed between the purge gas system and the two reactors to ensure that backflow is completely prevented.

[0033] In this invention, the solenoid valve selected is a normally closed three-way solenoid valve (operating voltage DC24V, withstand pressure 1.0MPaG, leakage rate <10%). -6 Pa·m 3 / s) The pipeline is made of corrosion-resistant 316L stainless steel (branch length < 1.5m, inner diameter 5.5mm). The oxygen analyzer is equipped with an electrochemical oxygen analyzer (range 0~25% O2). The purging gas system can be found in patents such as CN115117404A and CN112460637A.

[0034] The specific working status control is shown in Table 1.

[0035] Table 1. Operating Status Control Table for Example 1

[0036] model Valve action Gas path status Monitoring vessel A V1 (A→B open), V2 (fully closed), VT (A→B open) Gas A in reactor → Common pipeline → Oxygen analyzer Monitoring vessel B V1 (fully closed), V2 (A→B open), VT (A→B open) Gas from reactor B → Common pipeline → Oxygen analyzer Blowing mode V1 (fully closed), V2 (fully closed), VT (C→B open) Nitrogen → Common pipeline → Oxygen analyzer Standby mode All valves are fully closed. Physical isolation of the entire pipeline

[0037] The specific control process is as follows:

[0038] S [Start] --> M {Select Target Vessel}

[0039] M -->|Cafe A| A1[Open V1(AB) and VT(AB)]

[0040] M -->|Cafe B| A2[Open V2(AB) and VT(AB)]

[0041] A1 & A2 --> B [Measure for 60 seconds]

[0042] B --> C [Close all valves]

[0043] C --> D [Activate VT (CB) and purge for 15 seconds]

[0044] D --> E [Turn off VT]

[0045] Compared with existing traditional solutions, the specific cost inputs of this utility model are shown in Table 2.

[0046] Table 2. Comparison of input costs between the traditional solution and Example 1

[0047] index Traditional solution This utility model Equipment investment costs Two analyzers (cost 120,000 yuan) One analyzer + valve assembly (cost 75,000 yuan) Cross-contamination rate 4.50% ＜0.3% Analyze response time 45 seconds 20 seconds Equipment maintenance costs 18,000 yuan / year 500 yuan / year Oxygen analyzer lifespan 8 months 2 years

[0048] As shown in Table 2, this invention enables a single oxygen analyzer to perform pollution-free switching monitoring of two reactors, significantly reducing investment and maintenance costs and improving analysis efficiency.

[0049] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A time-division monitoring device for oxygen concentration in a dual-reactor system, characterized in that: It has two symmetrically distributed sampling branches, and each of the sampling branches is equipped with a reaction vessel; A common gas path module is provided outside the sampling branch to provide three-level gas path isolation for the entire device; The common gas path module includes a three-way solenoid valve V1 (3) and a three-way solenoid valve V2 (4) respectively installed on two sampling branches and connected to the reactor, a total solenoid valve VT (5) for controlling V1 and V2, and a purge gas system (1) respectively connected to V1, V2 and VT; The main solenoid valve VT (5) is also connected to an oxygen analyzer (6).

2. The time-division monitoring device for oxygen concentration in a dual-reactor system according to claim 1, characterized in that: The two reactors are respectively connected to the A ports of the three-way solenoid valves V1 and V2, the A port of the main solenoid valve VT (5) is connected to the B ports of V1 and V2, and the purge gas system (1) is connected to the C ports of V1 and V2.

3. The time-division monitoring device for oxygen concentration in a dual-reactor system according to claim 2, characterized in that: The purge gas system (1) is connected to port C of the main solenoid valve VT (5), and the oxygen analyzer (6) is connected to port B of the main solenoid valve VT (5).

4. The time-division monitoring device for oxygen concentration in a dual-reactor system according to claim 1, characterized in that: The two sampling branches are symmetrically distributed at an angle of 120°, and the branch length deviation is ≤5%.

5. The time-division monitoring device for oxygen concentration in a dual-reactor system according to claim 4, characterized in that: The two sampling branches are Φ8 stainless steel sampling tubes.

6. The time-division monitoring device for oxygen concentration in a dual-reactor system according to claim 1, characterized in that: The three ports of the three-way solenoid valves V1(3), V2 and the main solenoid valve VT(5) are all normally closed, and the valve core is made of PTFE sealing material.

7. The time-division monitoring device for oxygen concentration in a dual-reactor system according to claim 1, characterized in that: The common pipeline volume from port A of the main solenoid valve VT (5) to the inlet of the oxygen analyzer (6) is 30±5mL.

8. The time-division monitoring device for oxygen concentration in a dual-reactor system according to claim 1, characterized in that: The purge gas inlet pressure is 1.2-1.5 times the maximum operating pressure of the reactor, used to form a continuous positive pressure barrier.

9. The time-division monitoring device for oxygen concentration in a dual-reactor system according to claim 8, characterized in that: The nitrogen source pressure setting of the purging gas system (1) is 0.1~0.5MPa, which is more than 0.05MPa higher than the maximum operating pressure of the reactor.

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