High-temperature toluene gas concentration detection system

Abstract

The utility model relates to the technical field of environment detection, and provides a high-temperature toluene gas concentration detection system which comprises a sampling interface, a control valve, an air filter, a sampling pump, a condenser, a sample gas filter, a flow meter, a water stop filter and a detector which are connected in sequence, the tail end of the sampling interface extends into a sampling part, and the sampling pump provides air exhaust power, so that sampled gas enters the sampling interface, sequentially enters the control valve, the air filter, the sampling pump, the condenser, the sample gas filter, the flow meter, the water stop filter and the detector, and is finally discharged from the detector. According to the toluene concentration detection device, gas is cooled through two-stage cooling of the sampling connector and the condenser, the temperature problem that toluene concentration detection is affected by high temperature is solved, the purpose of filtering impurities is achieved through three-stage filtering of the air filter, the sample gas filter and the water stop filter, and accurate gas sampling can be completed.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental detection, and specifically, to a high-temperature toluene gas concentration detection system, and particularly to a toluene gas concentration detection system in a high-temperature oven. Background Technique

[0002] As a key part of the heat treatment of wire rope coatings, during the production of special wire rope coatings, the coating process is divided into a water-based dipping method and an organic solvent dipping method. From the process formula requirements understood at home and abroad at present, the formula process of the organic solvent dipping method contains chemical components such as toluene. And toluene is a chemical that is extremely volatile, flammable and explosive. Therefore, during the production process, its concentration must be strictly controlled to ensure safe production and environmental protection, and this requirement first requires equipment suppliers to have strict means at the equipment level to ensure. Due to the particularity of toluene concentration detection, there are still many problems in the detection of toluene concentration in the oven at high temperature.

[0003] The wire rope product passes through a glue tank containing organic solvents at room temperature, so that the glue adheres to the material evenly, and then immediately enters a constant-temperature oven for heat treatment. Therefore, the concentration control of toluene in the air is divided into two cases of normal temperature and high temperature. No matter which condition, first of all, the equipment must detect the accurate real-time concentration, that is, to ensure the accuracy of toluene concentration detection and the rapidity of detection response. Secondly, after detecting the accurate concentration, the concentration is effectively controlled; when the wire rope enters the oven, the oven process temperature is 110°C to 180°C. After the chemical components on its surface are heat-treated at high temperature, the chemical components including toluene immediately volatilize into gas, making the mixed gas in the oven have crystalline substances, water vapor, oil agents and dust particles. Therefore, impurities are also a major challenge to the accuracy of toluene concentration detection.

[0004] With the development of industrial technology, the detection of toluene concentration at room temperature is becoming increasingly mature. However, at present, there are few sensors on the market for detecting mixed gases containing toluene under high-temperature conditions. Production enterprises still have problems such as no detection or inaccurate detection of the high-temperature toluene concentration in the oven. Therefore, it is urgent to design a suitable toluene concentration detection sensor suitable for high temperature to solve the problems brought by high-temperature toluene concentration detection. Content of the Utility Model

[0005] Aiming at the defects in the prior art, the purpose of the utility model is to provide a high-temperature toluene gas concentration detection system.

[0006] According to a high-temperature toluene gas concentration detection system provided by the utility model, it includes a sampling interface, a control valve, an air filter, a sampling pump, a condenser, a sample gas filter, a flow meter, a water stop filter, and a detector connected in sequence;

[0007] The end of the sampling interface extends into the sampling site and provides suction power through a sampling pump to enable the sampling gas to enter the sampling interface and then enter the control valve, air filter, sampling pump, condenser, sample gas filter, flow meter, water stop filter, detector in sequence and finally be discharged from the detector. Among them, the sampling interface (11) is made of copper pipe, and the length of the sampling interface ≥ 3m.

[0008] Preferably, the length of the sampling interface is 5m.

[0009] Preferably, the control valve adopts an electromagnetic valve.

[0010] Preferably, the control valve is connected with a blow-off pipeline, and the blow-off pipeline is connected with a compressed air pipeline. Among them, a pressure reducing valve is arranged on the blow-off pipeline.

[0011] Preferably, a condensate drainage pipeline is arranged on the condenser, the condensate drainage pipeline is connected with a drainage outlet, and a drainage peristaltic pump is arranged on the condensate drainage pipeline.

[0012] Preferably, the sample gas filter is connected with a drainage pipeline, the drainage pipeline is connected with the condensate water outlet, and a drainage valve is arranged on the drainage pipeline.

[0013] Preferably, the detector is connected with an external discharge pipeline, and the external discharge pipeline is connected with the condensate water outlet.

[0014] Preferably, it further includes a PLC, and the PLC is electrically connected with the control valve, sampling pump, and flow meter respectively.

[0015] Preferably, a regulating valve is arranged on the flow meter to be able to adjust the flow rate.

[0016] Preferably, the detector adopts an infrared detector.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model cools the gas temperature through two-stage cooling of the sampling interface and the condenser, solves the temperature problem that affects the toluene concentration detection due to high temperature, and achieves the purpose of filtering impurities through three-stage filtering of the air filter, sample gas filter, and water stop filter. Removing impurities is of great significance for improving data accuracy and the service life of the equipment. The flow meter can detect the smoothness of the system and can complete accurate gas sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes, and advantages of the utility model will become more obvious:

[0020] Figure 1 This is a schematic structural diagram of the present utility model.

[0021] As shown in the figure:

[0022] Sampling interface 11

[0023] Control valve 12

[0024] Blow gas pipeline 121

[0025] Pressure reducing valve 122

[0026] Air filter 13

[0027] Sampling pump 14

[0028] Condenser 15

[0029] Drain peristaltic pump 151

[0030] Condensate drain pipeline 152

[0031] Sample gas filter 16

[0032] Drain pipeline 161

[0033] Drain valve 162

[0034] Flowmeter 17

[0035] Water stop filter 18

[0036] Detector 19

[0037] External discharge pipeline 191

[0038] Compressed gas pipeline 22

[0039] Drain outlet 23 Specific embodiments

[0040] The present utility model will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present utility model, but do not limit the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several changes and improvements can still be made. These all belong to the protection scope of the present utility model.

[0041] Embodiment 1:

[0042] The present utility model provides a high-temperature toluene gas concentration detection system, which is particularly suitable for detecting the toluene gas concentration in a high-temperature oven. The temperature of the high-temperature oven is generally controlled at 110°C to 180°C. Therefore, the high temperature mentioned in the present utility model generally refers to the gas within the temperature range of 110°C to 180°C, such asFigure 1 As shown, it includes a sampling interface 11, a control valve 12, an air filter 13, a sampling pump 14, a condenser 15, a sample gas filter 16, a flowmeter 17, a water stop filter 18, and a detector 19 that are connected in sequence. During sampling, the end of the sampling interface 11 extends into the sampling site for sampling. The sampling interface 11 is preferably made of copper pipe. The length of the sampling interface 11 is preferably ≥3m, such as 4m, or 5m, etc. The relatively long design of the sampling interface 11 allows the hot gas to dissipate heat when passing through the sampling interface 11 after sampling. It should be noted that the sampling interface 11 should ensure sealing, both to prevent external gas from mixing in and affecting the concentration of the sampled gas, and to avoid the leakage of harmful gases and cause equipment and personnel safety. The sampling interface 11 also needs to be able to withstand high temperatures and have a certain cooling effect, so as to avoid the subsequent instrument and equipment directly bearing high temperatures and enable a transitional cooling process.

[0043] Specifically, during sampling, the end of the sampling interface 11 extends into the high-temperature oven, and the sampling pump 14 provides the pumping power, so that the sampled gas enters the sampling interface 11 and then enters the control valve 12, air filter 13, sampling pump 14, condenser 15, sample gas filter 16, flowmeter 17, water stop filter 18, and detector 19 in sequence and finally discharges from the detector 19. The sampling pump 14 keeps the gas flowing continuously, which is beneficial to sampling in real time, accurately and uniformly, and is beneficial to the accuracy of the detection results. The air filter 13 filters out impurities to avoid the influence of solid particles, moisture and other substances in the gas and improve the data accuracy. The control valve 12 is preferably an electromagnetic valve. The control valve 12 is connected to a blow pipe 121, and the blow pipe 121 is connected to a compressed air pipe 22. The compressed air pipe 22 can continuously provide compressed air with a certain pressure for purging the valve or pipeline. Among them, a pressure reducing valve 122 is provided on the blow pipe 121, and thus the pressure of the compressed air entering the control valve 12 can be adjusted through the pressure reducing valve 122. By purging the control valve 12, grease and other substances can be discharged in time to avoid blockage, and the monitoring function can check in real time whether there is a blockage. The sample gas filter 16 is used to filter out impurities to avoid the influence of solid particles, moisture and other substances in the gas and improve the data accuracy. The detector 19 is preferably an infrared detector. The infrared analyzer is an instrument with very high stability and accuracy, and it can accurately detect the toluene concentration.

[0044] The present utility model is also provided with a PLC, which is electrically connected to the control valve 12, the sampling pump 14, and the flowmeter 17 respectively. Through the PLC, the opening and closing of the control valve 12 can be controlled, and the start and stop of the sampling pump 14 can be controlled. In addition, a regulating valve is provided on the flowmeter 17, and the opening degree of the regulating valve can be adjusted through the PLC to further adjust the flow rate. Through the test in the present utility model and the analysis of the laboratory sample gas, the measurement accuracy of this project is within ±1% LEL. By controlling the speed of the sampling pump 14, the flow rate of the system is ensured, and the system response time is about 2 seconds, basically meeting the real-time requirement, so it meets the requirements of the on-site working conditions.

[0045] As Figure 1 shown, a condensate drainage pipeline 152 is provided on the condenser 15. The condensate drainage pipeline 152 is connected to the drainage outlet 23, and a drainage peristaltic pump 151 is provided on the condensate drainage pipeline 152. The liquid condensed on the condenser 15 is discharged through the drainage peristaltic pump 151.

[0046] The sample gas filter 16 is connected with a drainage pipeline 161. The drainage pipeline 161 is connected to the condensate water outlet 21. Among them, a drainage valve 162 is provided on the drainage pipeline 161, and water can be discharged by manually opening the drainage valve 162. The detector 19 is connected with an external discharge pipeline 191, and the external discharge pipeline 191 is connected to the condensate water outlet 21.

[0047] Embodiment 2:

[0048] This embodiment is a preferred example of Embodiment 1. In this embodiment, a sampling port for collecting the mixed gas is added to the oven as the interface for the gas to be detected. A metal copper pipe about 5 meters long and 12 millimeters in diameter is used as the sampling interface 11 to access the sampling cabinet from the sampling port of the oven. Through the sampling interface 11, the sampled gas is cooled to below 70°C to prevent the subsequent equipment of the system from being exposed to high temperatures. The sampled gas entering the system first passes through the air filter 13 to filter out the solid particles in the air, and then the sampling pump 14 ensures the flow of the gas in the pipeline. Then it passes through the condenser 15 to remove the moisture in the air. The mixed gas contains oil agents and crystallized substances, and the system has a self-purging function. Through the PLC control technology, the compressed air pipeline 22 can be controlled to continuously provide compressed air with a certain pressure, and the blow pipeline 121 can perform reverse purging regularly to reduce the workload of system maintenance.

[0049] A regulating valve is provided on the flowmeter 17. By monitoring the flow switch, whether the pipeline is blocked can be effectively diagnosed, increasing multi-level guarantees. After passing through the flow switch and the water stop filter 18, it enters the infrared analyzer to analyze the toluene concentration in the mixed gas.

[0050] Through PLC technology and computer technology, all functions required by users can be achieved by this utility model. For example, on the host computer, the change of toluene concentration and whether the pipeline is blocked can be monitored, and some operation buttons such as purging can be set. Just click the mouse to execute the relevant operations, which is convenient and fast.

[0051] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0052] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of this utility model. Without conflict, the embodiments of this application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A high-temperature toluene gas concentration detection system, characterized in that, It includes a sampling interface (11), a control valve (12), an air filter (13), a sampling pump (14), a condenser (15), a sample gas filter (16), a flowmeter (17), a water stop filter (18), and a detector (19) that are connected in sequence. The end of the sampling interface (11) can extend into the sampling site. The sampling pump (14) can provide pumping power to enable the sampling gas to enter the sampling interface (11) and then enter the control valve (12), air filter (13), sampling pump (14), condenser (15), sample gas filter (16), flowmeter (17), water stop filter (18), and detector (19) in sequence and finally be discharged from the detector (19). Among them, the sampling interface (11) is made of copper pipe, and the length of the sampling interface (11) ≥ 3m.

2. The high-temperature toluene gas concentration detection system according to claim 1, wherein, The length of the sampling interface (11) is 5m.

3. The high-temperature toluene gas concentration detection system according to claim 1, wherein, The control valve (12) uses a solenoid valve.

4. The high-temperature toluene gas concentration detection system according to claim 1, wherein The control valve (12) is connected with a blow-off pipeline (121), and the blow-off pipeline (121) is connected with a compressed air pipeline (22). Among them, a pressure reducing valve (122) is arranged on the blow-off pipeline (121).

5. The high-temperature toluene gas concentration detection system according to claim 1, characterized in that A condensate drainage pipeline (152) is arranged on the condenser (15), the condensate drainage pipeline (152) is connected with a drainage outlet (23), and a drainage peristaltic pump (151) is arranged on the condensate drainage pipeline (152).

6. The high-temperature toluene gas concentration detection system according to claim 1, characterized in that, The sample gas filter (16) is connected with a drainage pipeline (161), the drainage pipeline (161) is connected with a condensate water outlet (21), and a drainage valve (162) is arranged on the drainage pipeline (161).

7. The high-temperature toluene gas concentration detection system according to claim 6, wherein The detector (19) is connected with an external discharge pipeline (191), and the external discharge pipeline (191) is connected with the condensate water outlet (21).

8. The high-temperature toluene gas concentration detection system according to claim 1, wherein, It also includes a PLC, and the PLC is electrically connected with the control valve (12), sampling pump (14), and flowmeter (17) respectively.

9. The high-temperature toluene gas concentration detection system according to claim 1, wherein A regulating valve is arranged on the flowmeter (17) to be able to regulate the flow rate.

10. The high-temperature toluene gas concentration detection system according to claim 1, characterized in that The detector (19) uses an infrared detector.

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