An explosion-proof online gas component detection device

Abstract

This utility model discloses an explosion-proof online gas component detection device. The device houses a gas component detection system within an explosion-proof enclosure. The enclosure body is connected to a cover via a flange, and the cover has a viewing window. The enclosure body has at least two gas path interfaces, used for obtaining the sample gas to be detected and processing the detection exhaust gas, respectively. A capacitive touchscreen is located inside the viewing window and is connected to a control motherboard. The control motherboard includes a sensor connected via an AD chip to obtain sensor data, which is then sent to an STM32 chip for data processing and analysis. The data is also transmitted to the capacitive touchscreen via a TTL serial port signal line. The viewing window achieves both operability and explosion-proof protection.

Description

Technical Field

[0001] This utility model belongs to the field of online detection technology for chemical waste gas, specifically relating to an explosion-proof online detection device for gas components. Background Technology

[0002] In petrochemical production enterprises, the working environment contains flammable and explosive gases, which can easily cause deflagration accidents upon contact with a spark. Therefore, online analytical instruments are preferentially selected for use in non-explosive environments. However, due to production and testing needs, analytical instruments must be placed in explosive environments, thus requiring explosion-proof treatment of the instrument enclosure. Explosion-proof online analytical instruments often use flameproof housings with external explosion-proof keyboards or Hall effect magnetic control schemes for operation. However, if the external interface is not tightened properly, leading to leakage, there is still a risk of external explosive gases entering. Explosion-proof online analytical instruments are often equipped with single-component measurement sensors, and multiple instruments are often required to measure multi-component gases separately. Utility Model Content

[0003] Purpose of the utility model: This utility model addresses the shortcomings of existing devices that use external explosion-proof keyboards or Hall effect magnetic control schemes to operate the instruments, and provides an explosion-proof online gas component detection device.

[0004] Technical solution: An explosion-proof online gas component detection device, wherein the gas component detection system is placed in an explosion-proof box, the box body is connected to the box cover by a flange, the box cover is provided with a viewing window, and the box body is provided with at least two gas passage interfaces, which are respectively used to obtain the sample gas to be detected and the detection tail gas.

[0005] A capacitive touchscreen is provided on the inner side of the viewing window, and the capacitive touchscreen is connected to the control motherboard.

[0006] The control motherboard includes a sensor connected via an AD chip to obtain the sensor's data, which is then sent to an STM32 chip for data processing and analysis. The data is also sent to a capacitive touchscreen via a TTL serial port signal line.

[0007] Furthermore, the sensor includes at least one or a combination of semiconductor sensors, thermal conductivity sensors, thermomagnetic sensors, electrochemical sensors, infrared sensors, laser sensors, temperature sensors, pressure sensors, flow sensors, and dew point sensors.

[0008] The sensors are connected in parallel or in series via branch pipes, and the branch pipes are equipped with solenoid valves to control the opening and closing of the circuit.

[0009] The branch pipes converge at the gas inlet located on the housing.

[0010] In the aforementioned device, the viewing window is made of sapphire glass and is fixed to the lid by a pressure ring. The lid has a protruding ring portion extending deep into the interior of the box, and a reinforcing plate is provided on the inner side of the protruding ring portion.

[0011] Furthermore, both the box body and the box cover are made of cast aluminum alloy, and the box body and the box cover are connected by a cylindrical stop joint surface and a stop joint surface.

[0012] The power supply wiring is connected to the enclosure via an explosion-proof cable clamp sealing connector;

[0013] The gas connection pipeline inside the device is made of steel.

[0014] Furthermore, the gas component detection system is as follows: the sample gas enters through the gas path interface, is connected to the flow sensor through a steel pipe, the outlet of the flow sensor is connected to the thermal conductivity hydrogen sensor through the steel pipe, then to the pressure sensor through the steel pipe, and simultaneously connected to the semiconductor carbon monoxide infrared sensor through the steel pipe. The outlet of the semiconductor carbon monoxide infrared sensor is connected to another gas path connector on the housing through the steel pipe.

[0015] The gas component detection system is mounted on a mounting plate, which is secured to the housing by bolts to prevent direct contact with the housing; the thermal conductivity hydrogen sensor is fixed to the housing by a bracket.

[0016] The mounting plate is also provided with a fixing support, and the fixing support has a mounting slot for inserting the circuit board card.

[0017] All components of this gas component detection system have fixed mounting positions on the mounting plate or inside the housing.

[0018] Beneficial effects: This invention features a viewing window made of sapphire glass on the lid of the explosion-proof enclosure. Inside the viewing window is a capacitive touchscreen. The touchscreen detects changes in capacitance through the viewing window to sense operational behavior, enabling direct human-machine interaction in explosive gas environments. Secondly, considering different gas components, this invention uses a single-component sensor for detection, and can be adjusted for different sample gases to meet the needs of the detection object, making it simple and practical. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the explosion-proof box;

[0020] Figure 2 This is a schematic diagram of the explosion-proof box structure after the lid is opened;

[0021] Figure 3 This is a schematic diagram of the box lid structure;

[0022] Figure 4 This is a schematic diagram showing the separation of the enclosure and the internal system;

[0023] Figure 5 This is a structural distribution diagram of the system's modular deployment;

[0024] Figure 6 The embodiment provides a detection system structure. Detailed Implementation

[0025] To provide a detailed explanation of the technical solution disclosed in this utility model, further details are provided below in conjunction with the accompanying drawings.

[0026] Combination Figure 1-3 As shown, this utility model firstly discloses an explosion-proof enclosure for installing and deploying a gas component detection system. The explosion-proof enclosure includes a enclosure body 1 and a cover 2. The enclosure body 1 has at least two gas inlets 3 for the inlet and outlet of sample gas (chemical gases to be analyzed). The gas inlets 3 include a sampling probe and a heating pipe to obtain the sample gas. The cover 2 is equipped with a handle 201. The cover 2 also features a raised ring 203, which improves installation reliability and explosion-proof performance. Further details can be found in [reference needed]. Figure 2 and Figure 3 The cover 2 is fixed to the enclosure 1 via an L-shaped connecting rod 205 and a flange. A reinforcing plate 204 is provided on the inner side of the L-shaped connecting rod 205 to enhance its sturdiness. A viewing window 4 is provided on the cover 2, containing sapphire glass 7. The sapphire glass 7 is fixed to the position of the viewing window 4 by bolts with a pressure ring 202. The use of sapphire glass 7 as the viewing window is for explosion-proof purposes and to accommodate the capacitive touchscreen. The capacitive touchscreen can be fitted snugly inside the enclosure of the sapphire glass 7. The capacitive touchscreen detects changes in capacitance through the viewing window to perceive operational behavior, enabling direct human-machine interaction in explosive gas environments.

[0027] Figure 4 The diagram shows the structure of the enclosure 1 after opening the cover 2, and the gas component detection system 6 deployed within it. The gas component detection system 6 is modularly installed within the enclosure 1. A mounting hole is provided on the side of the enclosure 1 for installing a level 601. For details on the deployment structure of the gas component detection system 6, please refer to [link to documentation]. Figure 5 As shown, the system is deployed inside the housing 1 via a mounting plate 8. The mounting plate 8 is supported by studs to prevent direct contact with the housing 1. The mounting plate 8 has several plug mounting positions and mounting positions for system components, facilitating system setup. This includes components necessary for chemical waste gas detection and analysis, such as transformer 602. Transformer 602 is fixed in its designated position and secured with clips to prevent loosening. Correspondingly, the mounting plate 8 also has a fixing support 10. (See attached diagram for details.) Figure 5The space can be divided according to the matching settings, and the board is installed through the mounting slot 101 on the fixed support 10, for example. Figure 5 The heating plate and heating module 605 are shown, with an amplification circuit board 606 mounted on its back side. Additionally, a control main board 11 is deployed on the mounting plate 8, where a thermal conductivity hydrogen sensor 603 is fixed inside the housing 1 via a bracket 9. The mounting plate 8 is U-shaped, as shown... Figure 5 As shown, related system components are deployed around the thermal conductivity hydrogen sensor 603, such as a power module 604 set in one corner of it. The power module 604 is also installed as a module after being set up through an integrated board.

[0028] The control motherboard 11 can receive various signals, including but not limited to signals from internal and external sources, and has master-slave functionality. Combined with an explosion-proof housing, it can provide diverse configurations in explosive environments, analyze and process signals, and output them to a capacitive touchscreen, increasing the information utilization rate and human-machine interface portability of the explosion-proof analyzer. It can also transmit signals processed by the main control board to the DCS. Specifically, it has multiple RS485 master interfaces, RS485 slave interfaces, RS232 master interfaces, RS232 slave interfaces, TTL interfaces, Ethernet interfaces, analog input interfaces, analog output interfaces, digital input interfaces, and relay output interfaces, and can process and analyze data transmitted from sensors. To achieve the detection of different gases, single-component sensors are used for analysis. Multiple sensor components can be provided, and sensor components can be freely combined according to different gas measurement scenarios, such as semiconductor sensors, thermal conductivity sensors, thermomagnetic sensors, electrochemical sensors, infrared sensors, laser sensors, temperature sensors, pressure sensors, flow sensors, dew point sensors, etc. For system connectivity, the commonly used sensor signals are RS485, RS232, and TTL. This analytical instrument is compatible with most sensors on the market, thereby increasing the information utilization rate of online analytical instruments and enhancing the reliability of data.

[0029] The working principle of a gas mass flow sensor is based on "thermal inertia" and the "Karman vortex street effect". Thermophysical parameters change due to gas flow. Based on this principle, the sensor measures the temperature difference in the gas and calculates the flow rate by heating and detecting the gas.

[0030] The working principle of a pressure sensor is based on the strain principle. The strain principle is based on the strain effect of materials; when an external force is applied to the sensor, the internal sensitive element deforms, and the resistance value of the strain gauge changes accordingly.

[0031] The working principle of a thermal conductivity hydrogen sensor is based on the thermal conduction effect. The composition of a gas is determined by the different thermal conductivities of various gases. Specifically, the content of a particular gas in a gas mixture is determined by measuring its thermal conductivity. Hydrogen has the highest thermal conductivity in a gas mixture, 7-8 times higher than nitrogen and oxygen. Therefore, when the background gas or other components in the gas mixture remain relatively constant, the thermal conductivity of the mixture is primarily determined by the amount of hydrogen. Thus, by measuring the change in the thermal conductivity of hydrogen to the sensor's heating element, the hydrogen concentration is determined.

[0032] The principle of a semiconductor-type carbon monoxide infrared sensor is based on the principle of infrared spectral absorption. When carbon monoxide gas molecules pass through a beam of light emitted from an infrared light source, a specific spectral band is absorbed. The instrument accurately calculates the concentration of carbon monoxide by measuring the intensity of the absorption spectrum.

[0033] Figure 6 The present invention provides a very simple detection system structure. Those skilled in the art will be able to understand the use of each sensor and will also understand that the connection method between the sensors mentioned in the above technical solution includes parallel or series connection through branch pipes. The branch pipes are equipped with solenoid valves to control the opening and closing of the circuit. The branch pipes converge to the gas interface located on the housing.

Claims

1. An on-line gas component explosion-proof detection device, which places a gas component detection system in an explosion-proof box, characterized in that, The explosion-proof box body is connected to the box cover via a flange. The box cover has a viewing window. The box body is provided with at least two gas passage interfaces, which are used to obtain the sample gas to be tested and the test exhaust gas for processing, respectively. A capacitive touchscreen is provided on the inner side of the viewing window, and the capacitive touchscreen is connected to the control motherboard. The control motherboard includes a sensor connected via an AD chip to obtain the sensor's data, which is then sent to an STM32 chip for data processing and analysis. The data is also sent to a capacitive touchscreen via a TTL serial port signal line.

2. The on-line gas component explosion-proof detection device according to claim 1, characterized in that, The sensors include at least one or a combination of semiconductor sensors, thermal conductivity sensors, thermomagnetic sensors, electrochemical sensors, infrared sensors, laser sensors, temperature sensors, pressure sensors, flow sensors, and dew point sensors. The sensors are connected in parallel or in series via branch pipes, and the branch pipes are equipped with solenoid valves to control the opening and closing of the circuit. The branch pipes converge at the gas inlet located on the housing.

3. The on-line gas component explosion-proof detection device according to claim 1, characterized in that, The viewing window is made of sapphire glass and is fixed to the lid by a pressure ring. The lid has a convex ring that extends into the interior of the box, and a reinforcing plate is provided on the inner side of the convex ring.

4. The on-line gas component explosion-proof detection device according to claim 1, characterized in that, The box body and box cover are both made of cast aluminum alloy and are fixed by L-shaped connecting rods. The box body and box cover are connected by a cylindrical stop joint surface and a stop joint surface.

5. The on-line gas component explosion-proof detection device according to claim 1, characterized in that, The power supply wiring is connected to the enclosure via an explosion-proof cable clamp sealing connector; The gas connection pipeline inside the device is made of steel.

6. The on-line gas component explosion-proof detection device according to claim 1, characterized in that, The gas component detection system is as follows: the sample gas enters through the gas path interface, is connected to the flow sensor through a steel pipe, the outlet of the flow sensor is connected to the thermal conductivity hydrogen sensor through the steel pipe, then to the pressure sensor through the steel pipe, and simultaneously connected to the semiconductor carbon monoxide infrared sensor through the steel pipe. The outlet of the semiconductor carbon monoxide infrared sensor is connected to another gas path connector on the housing through the steel pipe.

7. The on-line gas component explosion-proof detection device according to claim 6, characterized in that, The gas component detection system is mounted on a mounting plate, which is secured to the housing by bolts to prevent direct contact with the housing; the thermal conductivity hydrogen sensor is fixed to the housing by a bracket. The mounting plate is also provided with a fixing support, and the fixing support has a mounting slot for inserting the circuit board card. All components of this gas component detection system have fixed mounting positions on the mounting plate or inside the housing.

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