Safe leak-proof device for toxic gas in tail gas in acetonitrile production

Abstract

The utility model discloses a safe leak-proof device for poisonous gas in tail gas in acetonitrile production, which comprises a first-stage detection module, a second-stage detection module, a control module and an alarm module, the first-stage detection module is arranged at the joint or the outer surface of a container for storing acetonitrile tail gas, and the second-stage detection module is arranged at the joint or the outer surface of the container for storing acetonitrile tail gas. The sensor is used for monitoring the flow velocity and / or concentration of toxic gas near a leakage point in real time; the second-stage detection module is arranged at different fixed intervals from the container for storing the acetonitrile tail gas and is used for monitoring the flowing speed and / or concentration of the toxic gas at different positions in the diffusion process of the toxic gas in the acetonitrile production tail gas in real time; the control module is electrically connected with the first-stage detection module and the second-stage detection module in a communication manner and is used for judging the leakage grade of the toxic gas according to a comparison result; and the alarm module is electrically connected with the control module and is used for performing alarm operation of a corresponding degree according to the leakage level of the toxic gas. Precise grading of the leakage degree of the toxic gas is achieved.

Description

Technical Field

[0001] This utility model relates to the field of acetonitrile production safety monitoring technology, specifically a safety leak prevention device for toxic gases in acetonitrile production tail gas. Background Technology

[0002] Acetonitrile (also known as methyl cyanide or cyanomethane) is a colorless, transparent liquid with a distinctive pungent odor. It is highly toxic and volatile. The production of acetonitrile generates a large amount of tail gas containing toxic gases such as unreacted acrylonitrile, hydrogen cyanide, and other volatile organic compounds. Exposure to these toxic gases can be harmful to human health. Existing leak prevention devices for toxic gases in acetonitrile production tail gas mostly use single-point concentration detection or single-threshold alarms, which have the following drawbacks: they cannot distinguish between minor leaks and major accidents, leading to inappropriate response measures; single-point detection is susceptible to environmental interference, resulting in a high false alarm rate; and they lack multi-level linkage control functions, failing to achieve tiered emergency response. Utility Model Content

[0003] The purpose of this invention is to provide a safety leak prevention device for toxic gases in acetonitrile production tail gas, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a safety leak prevention device for toxic gases in acetonitrile production tail gas, comprising: a first-stage detection module, a second-stage detection module, a control module, and an alarm module, wherein:

[0005] The first-level detection module is installed at the connection or outer surface of the container storing acetonitrile tail gas, and is used to monitor the flow rate and / or concentration of toxic gas near the leak point in real time.

[0006] The second-level detection module is set at different fixed intervals from the container storing acetonitrile tail gas, and is used to monitor in real time the flow rate and / or concentration of toxic gas at different locations during the diffusion process of toxic gas in acetonitrile production tail gas.

[0007] The control module is electrically connected to the first-level detection module and the second-level detection module respectively, and is used to compare the monitoring data of the first-level detection module with a first preset threshold and the monitoring data of the second-level detection module with a second preset threshold, and determine the leakage level of toxic gas by comparing the comparison results.

[0008] The alarm module is electrically connected to the control module and is used to perform alarm operations of corresponding levels according to the leakage level of toxic gas.

[0009] During operation, the number of first-level and second-level detection modules is greater than or equal to three. The first-level detection module monitors the gas flow rate (V1) and / or concentration (C1) near the leak point of the container storing tail gas during acetonitrile production in real time; the second-level detection module monitors the gas flow rate (V2) and / or concentration (C2) at a distance in real time; and transmits the collected data to the control module in real time. The control module compares the received data with standard values ​​and triggers the corresponding level of alarm module based on the comparison result. The alarm module performs the corresponding level of alarm operation based on the trigger operation.

[0010] Compared to existing technologies, this application achieves precise classification of the degree of toxic gas leakage through a two-level detection module, and performs corresponding alarm operations for different levels of leakage. This enables accurate monitoring and management of toxic gases in acetonitrile generation tail gas, reduces the false alarm rate, and realizes a graded emergency response, effectively preventing harm to personnel.

[0011] In one embodiment of this application, both the first-level detection module and the second-level detection module include a gas flow meter and / or a concentration sensor, and the concentration sensor is one or more of an electrochemical sensor, a PID sensor, or an infrared sensor.

[0012] In one embodiment of this application, the control module includes:

[0013] Microprocessors are used for data computation and threshold comparison;

[0014] A threshold storage unit is used to store a first preset threshold and a second preset threshold.

[0015] The data communication unit supports one or more of the following protocols: RS485, Modbus, or LoRa.

[0016] In one embodiment of this application, the alarm module includes:

[0017] Minor accident alarm unit, including a yellow audible and visual alarm and a local display screen;

[0018] The major accident alarm unit includes a red audible and visual alarm, an SMS push module, and an emergency shut-off valve drive unit.

[0019] In one embodiment of this application, the SMS push module is implemented through a GSM communication module or a 5G communication module, and the emergency shut-off valve drive unit is a solenoid valve or a pneumatic valve drive circuit.

[0020] In one embodiment of this application, a power supply module is also included, which supports dual power supply from mains power and UPS uninterruptible power supply, and has overvoltage protection and undervoltage protection functions.

[0021] In one embodiment of this application, an environmental parameter compensation module is further included. The environmental parameter compensation module is electrically connected to the control module and is used to correct the gas flow rate or concentration detection value based on the data from the temperature sensor and pressure sensor.

[0022] In one embodiment of this application, the fixed interval length is 3-10 meters, the first preset threshold is 0.1-1 m / s and / or 100-500 ppm, and the second preset threshold is 1-5 m / s and / or 500-2000 ppm.

[0023] In one embodiment of this application, a data recording module is further included. The data recording module is electrically connected to the control module and is used to store historical detection data and alarm events, supporting export to a USB storage device or DCS system.

[0024] In one embodiment of this application, the control module further includes a self-diagnostic unit for detecting sensor failures, communication interruptions, or power abnormalities, and prompting maintenance needs through the alarm module. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of a safety leak prevention device for toxic gases in acetonitrile production tail gas provided in an embodiment of this application;

[0027] Figure Labels

[0028] 100. First-level detection module; 200. Second-level detection module; 300. Control module; 301. Microprocessor; 302. Threshold storage unit; 303. Data communication unit; 304. Self-diagnosis unit; 400. Alarm module; 401. Minor accident alarm unit; 402. Major accident alarm unit; 500. Environmental parameter compensation module; 600. Data recording module. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Please see Figure 1 A safety leak prevention device for toxic gases in acetonitrile production tail gas includes: a first-stage detection module 100, a second-stage detection module 200, a control module 300, and an alarm module 400, wherein:

[0034] The first-level detection module 100 is installed at the connection or outer surface of the container storing acetonitrile tail gas, and is used to monitor the flow rate and / or concentration of toxic gas near the leak point in real time.

[0035] The second-level detection module 200 is set at different fixed intervals from the container storing acetonitrile tail gas, and is used to monitor in real time the flow rate and / or concentration of toxic gas at different locations in the diffusion process of toxic gas in acetonitrile production tail gas.

[0036] The control module 300 is electrically connected to the first-level detection module 100 and the second-level detection module 200 respectively. It is used to compare the monitoring data of the first-level detection module 100 with the first preset threshold and the monitoring data of the second-level detection module 200 with the second preset threshold, and to determine the leakage level of toxic gas by comparing the comparison results.

[0037] The alarm module 400 is electrically connected to the control module 300 and is used to perform alarm operations according to the corresponding level of toxic gas leakage.

[0038] During operation, the number of first-level detection modules 100 and second-level detection modules 200 is greater than or equal to three. First-level detection module 100 monitors the gas flow rate (V1) and / or concentration (C1) near the leak point of the container storing tail gas during acetonitrile production in real time; second-level detection module 200 monitors the gas flow rate (V2) and / or concentration (C2) at a distance in real time; and transmits the collected data to control module 300 in real time. Control module 300 compares the received data with standard values ​​and triggers the corresponding level of alarm module 400 based on the comparison result. Alarm module 400 performs an alarm operation of the corresponding degree based on the trigger operation.

[0039] Compared to existing technologies, this application achieves precise classification of the degree of toxic gas leakage through a two-level detection module, and performs corresponding alarm operations for different levels of leakage. This enables accurate monitoring and management of toxic gases in acetonitrile generation tail gas, reduces the false alarm rate, and realizes a graded emergency response, effectively preventing harm to personnel.

[0040] In some embodiments, both the first-level detection module 100 and the second-level detection module 200 include a gas flow meter and / or a concentration sensor, wherein the concentration sensor is one or more of an electrochemical sensor, a PID sensor, or an infrared sensor. Setting up different types of detection equipment ensures the accuracy of leak gas monitoring, facilitating timely responses from personnel.

[0041] In some embodiments, the control module 300 includes:

[0042] Microprocessor 301 is used for data computation and threshold comparison;

[0043] Threshold storage unit 302 is used to store a first preset threshold and a second preset threshold;

[0044] The data communication unit 303 supports one or more of the following protocols: RS485, Modbus, or LoRa.

[0045] The control module 300 enables rapid processing of data from multiple levels of equipment, accurate monitoring and management of toxic gases in acetonitrile generation exhaust, reduces false alarm rates, and facilitates tiered emergency response.

[0046] In some embodiments, the alarm module 400 includes:

[0047] Minor accident alarm unit 401 includes a yellow audible and visual alarm and a local display screen;

[0048] The major accident alarm unit 402 includes a red audible and visual alarm, an SMS push module, and an emergency shut-off valve drive unit.

[0049] The system provides corresponding alarm responses for different levels of leakage, enabling precise monitoring and management of toxic gases in acetonitrile generation tail gas, reducing false alarm rates, and achieving tiered emergency response.

[0050] In some embodiments, the SMS push module is implemented via a GSM or 5G communication module, and the emergency shut-off valve drive unit is a solenoid valve or pneumatic valve drive circuit. The SMS push module provides timely reminders to staff, while the emergency shut-off valve drive unit physically isolates the toxic acetonitrile production exhaust gas from the air. In the event of a major accident, the shut-off valve and SMS push are linked, shortening emergency response time and effectively preventing harm to staff.

[0051] In some embodiments, a power supply module is also included. This module supports dual power supply from mains power and a UPS (Uninterruptible Power Supply), and features overvoltage and undervoltage protection. The power supply module ensures stable operation of different modules, which helps improve the efficiency of tiered emergency response.

[0052] In some embodiments, an environmental parameter compensation module 500 is also included. The environmental parameter compensation module 500 is electrically connected to the control module 300 and is used to correct the gas flow rate or concentration detection value based on the data from the temperature sensor and the pressure sensor.

[0053] The environmental parameter compensation module 500 improves the accuracy of the data collected by the first and second detection modules, enabling precise classification of the degree of toxic gas leakage.

[0054] In some embodiments, the fixed interval length is 3-10 meters, the first preset threshold is 0.1-1 m / s and / or 100-500 ppm, and the second preset threshold is 1-5 m / s and / or 500-2000 ppm. By detecting the flow rate and / or concentration of toxic gases in the exhaust gas at different locations, the degree of toxic gas leakage can be accurately classified, and corresponding alarm operations can be performed for different levels of leakage. This achieves accurate monitoring and management of toxic gases in acetonitrile generation exhaust gas and reduces the false alarm rate.

[0055] In some embodiments, a data logging module 600 is also included. The data logging module 600 is electrically connected to the control module 300. The data logging module 600 is used to store historical detection data and alarm events, and supports exporting to a USB storage device or a DCS system. The data logging module 600 facilitates accurate retrospective analysis of subsequent processes.

[0056] In some embodiments, the control module 300 further includes a self-diagnostic unit 304 for detecting sensor failures, communication interruptions, or power supply anomalies, and alerting the alarm module 400 to maintenance needs. The self-diagnostic unit 304 enables rapid judgment and response to system faults, and can promptly prevent more serious accidents from occurring.

[0057] 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 safety leak prevention device for toxic gases in the tail gas of acetonitrile production, characterized in that, include: The system consists of a first-level detection module, a second-level detection module, a control module, and an alarm module, among which: The first-level detection module is installed at the connection or outer surface of the container storing acetonitrile tail gas, and is used to monitor the flow rate and / or concentration of toxic gas near the leak point in real time. The second-level detection module is set at different fixed intervals from the container storing acetonitrile tail gas, and is used to monitor in real time the flow rate and / or concentration of toxic gas at different locations during the diffusion process of toxic gas in acetonitrile production tail gas. The control module is electrically connected to the first-level detection module and the second-level detection module respectively, and is used to compare the monitoring data of the first-level detection module with a first preset threshold and the monitoring data of the second-level detection module with a second preset threshold, and determine the leakage level of toxic gas by comparing the comparison results. The alarm module is electrically connected to the control module and is used to perform alarm operations of corresponding levels according to the leakage level of toxic gas.

2. The apparatus according to claim 1, characterized in that, Both the first-level detection module and the second-level detection module include a gas flow meter and / or a concentration sensor, and the concentration sensor is one or more of an electrochemical sensor, a PID sensor, or an infrared sensor.

3. The apparatus according to claim 1, characterized in that, The control module includes: Microprocessors are used for data computation and threshold comparison; A threshold storage unit is used to store a first preset threshold and a second preset threshold. The data communication unit supports one or more of the following protocols: RS485, Modbus, or LoRa.

4. The apparatus according to claim 1, characterized in that, The alarm module includes: Minor accident alarm unit, including a yellow audible and visual alarm and a local display screen; The major accident alarm unit includes a red audible and visual alarm, an SMS push module, and an emergency shut-off valve drive unit.

5. The apparatus according to claim 4, characterized in that, The SMS push module is implemented through a GSM communication module or a 5G communication module, and the emergency shut-off valve drive unit is a solenoid valve or a pneumatic valve drive circuit.

6. The apparatus according to claim 1, characterized in that, It also includes a power supply module, which supports dual power supply from mains power and UPS uninterruptible power supply, and has overvoltage protection and undervoltage protection functions.

7. The apparatus according to claim 1, characterized in that, It also includes an environmental parameter compensation module, which is electrically connected to the control module. The environmental parameter compensation module is used to correct the gas flow rate or concentration detection value based on the data from the temperature sensor and pressure sensor.

8. The apparatus according to claim 1, characterized in that, The fixed interval length is 3-10 meters, the first preset threshold is 0.1-1 m / s and / or 100-500 ppm, and the second preset threshold is 1-5 m / s and / or 500-2000 ppm.

9. The apparatus according to claim 1, characterized in that, It also includes a data recording module, which is electrically connected to the control module. The data recording module is used to store historical detection data and alarm events, and supports exporting to a USB storage device or DCS system.

10. The apparatus according to claim 1, characterized in that, The control module also includes a self-diagnostic unit for detecting sensor failures, communication interruptions, or power abnormalities, and alerting maintenance needs through the alarm module.

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