Fixed bed reactor circulating gas detection system

Abstract

The utility model provides a fixed bed reactor circulating gas detection system; the detection gas inlet joint, gas filtering device, detection gas pressure reducing valve and oil-gas separator, gas drying device, measuring gas flow meter, gas detector and detection gas exhaust port joint are sequentially connected through pipelines and form a delivery channel for the detection gas to pass through; the sampling three-way hand valve is arranged on the pipeline between the detection gas pressure reducing valve and the oil-gas separator and the gas drying device. The fixed bed reactor circulating gas detection system enables the detection gas to pass through each device according to the set process sequence, thereby realizing effective filtration, drying, measurement and detection of the gas.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a fixed bed reactor circulating gas detection system. Background Art

[0002] In the chemical production process, fixed bed reactors are a common reaction equipment and are widely used in various chemical reaction processes. However, the gas composition produced during the reaction is complex and may contain toxic, harmful or flammable and explosive gases. Therefore, the detection of the circulating gas in the fixed bed reactor is very important.

[0003] In the fixed-bed reactor for synthesizing thymol from m-cresol and propylene, nitrogen needs to be added to protect the catalyst and the gas linear velocity needs to be increased to improve the selectivity of thymol. The high concentration of propylene leads to poor selectivity and the reaction system needs to be quantitatively diluted by nitrogen. Currently, the offline chromatography method is used. The above detection has the following disadvantages:

[0004] 1) It is necessary to take samples in the workshop. Since the alkylation process involves flammable and explosive materials, there is a risk of gas leakage when taking samples on site.

[0005] 2) There are large human errors in gas sampling and injection;

[0006] 3) Frequent sampling increases the labor costs of the laboratory, and the costs of consumables and chromatographic maintenance also increase.

[0007] The utility model with application number CN201520190041.1 discloses a fixed bed reactor, including a reaction furnace, a gas flow control component, a liquid flow control component, a preheating component, a cooling tower, a drying and purification device, a gas detection device, a volume flow detection device, and an exhaust gas treatment device. The air inlet of the gas flow control component is connected to the external environment, and the air outlet of the gas flow control component is connected to the air inlet of the preheating component; the liquid inlet of the liquid flow control component is connected to the liquid storage device, the liquid outlet of the liquid flow control component is connected to the liquid inlet of the preheating component, and the gas-liquid outlet of the preheating component is connected to the reaction furnace; the air outlet of the reaction furnace is connected to the air inlet of the cooling tower, the air outlet of the cooling tower is connected to the air inlet of the drying and purification device, the air outlet of the drying and purification device is connected to the air inlet of the gas detection device, the air outlet of the gas detection device is connected to the air inlet of the volume flow detection device, and the air outlet of the volume flow detection device is connected to the exhaust gas treatment device.

[0008] However, the fixed bed reactor in the above patented technology does not have a circulating gas detection system, and is unable to detect the thymol raw material gas, and is even unable to overcome the technical problems existing in the prior art. Utility Model Content

[0009] The purpose of the utility model is to provide a fixed bed reactor circulating gas detection system to solve the problems raised in the above background technology:

[0010] 1) How to use equipment to accurately detect the composition and flow rate of the circulating gas in the fixed bed reactor in real time to ensure production safety.

[0011] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0012] A fixed bed reactor circulating gas detection system;

[0013] It includes a gas filter device, a gas detector, a measuring gas flow meter, a gas drying device, a detection gas pressure reducing valve and an oil-gas separator, a sampling three-way hand valve, a detection gas inlet connector, a detection gas exhaust connector, a gas detector drain connector and a detection gas sampling connector;

[0014] The detection gas inlet connector, the gas filtering device, the detection gas pressure reducing valve and the oil-gas separator, the gas drying device, the measuring gas flow meter, the gas detector and the detection gas exhaust connector are sequentially connected through pipelines and form a delivery channel for the detection gas to pass through;

[0015] The sampling three-way hand valve is arranged on the pipeline between the detection gas pressure reducing valve, the oil-gas separator and the gas drying device, the first inlet of the sampling three-way hand valve is connected with the outlet of the detection gas pressure reducing valve and the oil-gas separator through the pipeline, the first outlet of the sampling three-way hand valve is connected with the inlet of the gas drying device through the pipeline, and the second outlet of the sampling three-way hand valve is connected with the detection gas sampling port joint through the pipeline;

[0016] The gas detector drain port connector is connected to the gas detector drain port connector through a pipeline.

[0017] On the basis of the above technical solution, the present invention can also be improved as follows.

[0018] Furthermore, it also includes an exhaust flow regulating valve, and two ports of the exhaust flow regulating valve are respectively connected to the inlet end of the measuring gas flow meter and the outlet end of the gas detector through pipelines.

[0019] Furthermore, it also includes a gas filter device drain connector and a drain solenoid valve. The gas filter device drain connector is connected to the gas filter device drain connector through a pipeline, and the drain solenoid valve is arranged on the pipeline between the gas filter device drain connector and the gas filter device drain connector.

[0020] Furthermore, it also includes a cabinet, in which the gas filter device, the gas detector, the measuring gas flow meter, the gas drying device, the detection gas pressure reducing valve and the oil-gas separator, and the sampling three-way manual valve are all arranged;

[0021] The gas filter device drain port connector, the detection gas inlet connector, the detection gas exhaust port connector, the gas detector drain port connector and the detection gas sampling port connector are all fixed to the cabinet side wall and their respective ends extend out of the cabinet.

[0022] Furthermore, it also includes a boost exhaust pump, the detection gas exhaust port connector is connected to the inlet of the boost exhaust pump through a pipeline, and the outlet of the boost exhaust pump is connected to an external gas storage tank through a pipeline.

[0023] Furthermore, a check valve is provided at the outlet of the boost exhaust pump.

[0024] With such a structure, the fixed bed reactor circulating gas detection system enables the detection gas to pass through various devices according to a set process sequence, thereby achieving effective filtration, drying, measurement and detection of the gas.

[0025] The sampling three-way hand valve makes it easy to take samples for testing during the flow of gas without affecting the normal flow of gas.

[0026] The gas detector drain port connector is connected to the gas detector drain port connector through a pipeline, and is used to discharge the accumulated water that may be generated inside the gas detector to prevent the accumulated water from damaging the gas detector.

[0027] The beneficial technical effects of the fixed bed reactor circulating gas detection system are:

[0028] 1) The relevant test data of the detector can be viewed in real time, which greatly reduces the risk of staff taking samples; 2) The detector can help us to continue testing 24 hours a day, even if there is no operation; 3) Simple installation and maintenance: The online detector only needs to be installed once for continuous testing, and no other installation is required later. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is one of the schematic diagrams of the embodiment of the fixed bed reactor circulating gas detection system.

[0030] Figure 2 This is the second schematic diagram of the embodiment of the fixed bed reactor circulating gas detection system (the booster exhaust pump and related pipelines are omitted in the figure).

[0031] Figure 3 It is a schematic diagram of an explosion-proof electrical control box in an embodiment of the fixed bed reactor circulating gas detection system.

[0032] Figure 4 The invention is a flow diagram of the principle of the method for detecting thymol raw material gas.

[0033] Description of the numbers in the figure:

[0034] Cabinet-100; booster exhaust pump-200; check valve-210; gas filter device-310; gas detector-320; measuring gas flow meter-330; gas drying device-340; sampling three-way manual valve-360; drainage solenoid valve-370; exhaust flow regulating valve-380; detection gas pressure reducing valve and oil-gas separator-390; explosion-proof electrical control box-400; power inlet-410; detector signal power inlet and outlet-420; spare interface-430; mute button-441; detector alarm indicator-442; filter device drainage indicator-443; on-site sound and light alarm-444; equipment operation indicator-445; equipment start knob-446; power switch-447; detection gas inlet connector-510; detection gas exhaust port connector-520; gas detector drain port connector-530; gas filter device drain port connector-540; detection gas sampling port connector-550. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0036] The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementations.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] See also Figures 1 to 3 .

[0039] The fixed bed reactor circulating gas detection system includes a cabinet 100, a booster exhaust pump 200, a gas filter device 310, a gas detector 320, a measuring gas flow meter 330, a gas drying device 340, an explosion-proof electrical control box 400, a detection gas pressure reducing valve and an oil-gas separator 390, a sampling three-way manual valve 360, an exhaust flow regulating valve 380, a drain solenoid valve 370, a detection gas inlet connector 510, a detection gas exhaust port connector 520, a gas detector drain port connector 530 (calibration gas inlet connector), a gas filter device drain port connector 540 and a detection gas sampling port connector 550.

[0040] The gas filter device 310 uses a filter element with a filtration accuracy of 10μm. The equipment has an automatic drainage function. The setting time is every 10 minutes, and the drainage is 3 seconds. The drainage manual valve at the bottom is always open. When the solenoid valve fails, the manual valve is closed and the equipment can continue to operate.

[0041] The sensor of the gas detector 320 is isolated from the external gas, so that the sensor only measures the gas in the pipeline.

[0042] The measuring gas flow meter 330 measures the sensor gas flow entering the gas detector 320, and the flow is adjusted to about 0.4L / min through the regulating valve at the lower end of the flow meter.

[0043] The exhaust flow regulating valve 380 adjusts the exhaust flow of the detection gas and coordinates the flow of the measured gas flow meter 330 (generally, the flow regulating valve is adjusted to the maximum opening. If the flow of the gas detector 320 cannot reach about 0.4L / min when the opening is adjusted to the maximum value, the regulating valve should be closed a little bit).

[0044] The gas drying device 340 has a built-in highly absorbent desiccant to dry the filtered gas and increase the life of the gas detector 320 (when the particles inside turn pink, the drying device needs to be replaced);

[0045] The high-pressure gas entering the detection gas pressure reducing valve and the oil-gas separator 390 is reduced in pressure to a pressure suitable for the gas detector 320 through this pressure reducing valve. It has its own pressure gauge to display the gas pressure after decompression; the separated liquid is manually discharged.

[0046] The gas filter 310, gas detector 320, measuring gas flow meter 330, gas drying device 340, detection gas pressure reducing valve and oil-gas separator 390, sampling three-way manual valve 360 ​​are all arranged in the cabinet 100. When in use, the bottom bracket of the cabinet 100 or the wall mounting can be selected according to the situation.

[0047] The gas filter device drain port connector 540 , the detection gas inlet connector 510 , the detection gas exhaust port connector 520 , the gas detector drain port connector 530 and the detection gas sampling port connector 550 are all fixed to the side wall of the cabinet 100 and their respective ends extend out of the cabinet 100 .

[0048] The detection gas inlet connector 510, the gas filter device 310, the detection gas pressure reducing valve and the oil-gas separator 390, the gas drying device 340, the measuring gas flow meter 330, the gas detector 320 and the detection gas exhaust connector 520 are connected in sequence through pipelines and constitute a delivery channel for the detection gas to pass through.

[0049] The sampling three-way manual valve 360 ​​is arranged on the pipeline between the detection gas pressure reducing valve and the oil-gas separator 390 and the gas drying device 340. The first inlet of the sampling three-way manual valve 360 ​​is connected to the outlet of the detection gas pressure reducing valve and the oil-gas separator 390 through a pipeline, the first outlet of the sampling three-way manual valve 360 ​​is connected to the inlet of the gas drying device 340 through a pipeline, and the second outlet of the sampling three-way manual valve 360 ​​is connected to the detection gas sampling port connector 550 through a pipeline.

[0050] The gas filter device drain port connector 540 is connected to the gas filter device 310 drain port connector via a pipeline, and the drain solenoid valve 370 is disposed on the pipeline between the gas filter device drain port connector 540 and the gas filter device 310 drain port connector.

[0051] The inlet end of the measuring gas flow meter 330 and the outlet end of the gas detector 320 are respectively provided with three-way connections, and the two ports of the exhaust flow regulating valve 380 are respectively connected to the three-way connections of the inlet end of the measuring gas flow meter 330 and the outlet end of the gas detector 320 through pipelines.

[0052] The gas detector drain port connector 530 is connected to the gas detector 320 drain port connector via a pipeline.

[0053] The detection gas exhaust port connector 520 is connected to the inlet of the boost exhaust pump 200 through a pipeline, and the outlet of the boost exhaust pump 200 is connected to the external gas storage tank through a pipeline. The detection gas can reach a pressure of 0.35MPa after passing through the boost exhaust pump 200. A check valve 210 is provided at the outlet of the boost exhaust pump 200.

[0054] The pipelines are all made of 6mm stainless steel pipes or copper pipes, and all interface sizes are made of 6mm stainless steel ferrule joints.

[0055] The circuit control of the fixed bed reactor circulating gas detection system is concentrated in the explosion-proof electrical control box 400, which is used to control the electrical part of the entire detection system to ensure the safe and stable operation of the system. The detection gas pressure reducing valve and the oil-gas separator 390 are used to adjust the pressure of the detection gas to adapt it to the processing requirements of the subsequent device. The oil-gas separator is used to separate the oil and gas in the gas to avoid the interference of the oil on the detection results. The fixed bed reactor circulating gas detection system needs to provide two separate power supplies, one for the system control and the vacuum device (voltage: AC220V), and one for the gas detector 320.

[0056] The explosion-proof electrical control box 400 is provided with a mute button 441, a detector alarm indicator light 442, a filter device drainage indicator light 443, an on-site sound and light alarm 444, an equipment operation indicator light 445, an equipment start knob 446, and a power switch 447.

[0057] When the gas concentration reaches the lower alarm limit of the detector, the alarm indicator light turns on and the on-site sound and light alarm sounds. Press this button to stop the sound and light alarm.

[0058] Detector alarm indicator light 442, when the detector low alarm output, the light is on, and the sound and light alarm sounds;

[0059] The filter device drain indicator light 443 is on when the filter device drain solenoid valve 370 is powered on;

[0060] On-site sound and light alarm 444 When the gas concentration reaches the lower alarm value of the detector, the on-site sound and light alarm sounds;

[0061] The equipment operation indicator light 445 is on when the equipment start button is turned on and the vacuum pump is powered on and running;

[0062] The equipment starts the knob 446. When this knob is turned, the vacuum pump starts, the test gas is inlet, the solenoid valve loses power, and the filter drain solenoid valve 370 opens for 3 seconds every 10 minutes (because the inlet gas is positive pressure gas, the test gas inlet solenoid valve does not need to be closed when the drain solenoid valve 370 is opened);

[0063] The power switch 447 turns on the power of the device, the entire device is powered on, the detector is powered on, and the vacuum pump and the drain solenoid valve 370 are powered off.

[0064] The explosion-proof electrical control box 400 is also provided with a power supply inlet 410, a detector signal power supply inlet and outlet 420 and a spare interface 430. The detector signal power supply inlet and outlet 420 connector is a separate power supply interface for the detector power supply, and the output signal is: 4-20mA; the spare interface 430 is an interface thread.

[0065] When in use, adjust the gas flow meter 330 for gas measurement, open the flow regulating valve of the gas detector 320 to the maximum, and adjust the flow of the gas flow meter 330 to about 0.4L / min (if the gas flow meter 330 cannot adjust to this flow, the flow regulating valve is slightly closed to make the flow of the gas flow meter 330 to about 0.4L / min); the equipment starts to work normally;

[0066] When sampling the test gas, when the arrow of the three-way valve handle points to the right, the device works normally. When sampling is required, rotate the arrow of the three-way valve handle to the left and connect it to the test gas sampling port connector 550 to achieve test gas sampling. After sampling is completed, the three-way valve returns to the initial position and the device works normally.

[0067] When the desiccant in the gas drying device 340 changes from blue to pink, it is necessary to replace the desiccant. When replacing, loosen the upper and lower ferrules, open the fixing clips, take out the drying device, unscrew the top cover, pour out the expired desiccant, replace it with a new desiccant, tighten the cover, secure and connect it, and then it can be operated again. The replaced desiccant will turn blue when exposed to the sun or heated, and can be reused 2-3 times.

[0068] See also Figure 4 .

[0069] The method for detecting thymol raw material gas using the above-mentioned fixed bed reactor circulating gas detection system (the raw material gas is a mixed gas of propylene and nitrogen, and the raw material gas requires a propylene concentration of 45-70%), comprises the following steps:

[0070] The raw material gas with a pressure of 0.4 MPa is introduced into the detection gas inlet connector 510;

[0071] The raw gas passes through the gas filter device 310, the detection gas pressure reducing valve and oil-gas separator 390, and the gas drying device 340 in sequence to reach the gas detector 320;

[0072] In this process, the raw gas goes through the pressure reducing valve, drying, filtering, and separation process, and the pressure of the raw gas becomes 50-100KPa;

[0073] The raw gas enters the gas detector 320 for detection, and the pressure of the raw gas becomes 0.35 MPa after passing through the booster exhaust pump 200;

[0074] The tested raw gas is transported to an external gas tank for storage.

[0075] The gas filtering device 310 can effectively remove impurities in the raw gas to ensure the accuracy of the test results; the test gas pressure reducing valve and oil-gas separator 390 can adjust the pressure of the raw gas to an appropriate range to avoid damage to the gas detector 320; the gas drying device 340 can remove moisture from the raw gas to prevent moisture from interfering with the test results.

[0076] That is, the raw gas of 0.4MPa passes through the pressure reducing valve, drying, filtration, separation (50-100KPa) in sequence, then passes through the gas detector 320, and finally passes through the booster vacuum pump 200 and is transported to a storage tank with a pressure of 0.35MPa 20 meters away.

[0077] The above is only one embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the principle of the present invention, and these should also be regarded as belonging to the protection scope of the present invention.

Claims

1. A fixed bed reactor circulating gas detection system, characterized by: It comprises a gas filtering device (310), a gas detector (320), a measuring gas flow meter (330), a gas drying device (340), a detection gas pressure reducing valve and an oil-gas separator (390), a sampling three-way manual valve (360), a detection gas inlet connector (510), a detection gas exhaust port connector (520), a gas detector drain port connector (530) and a detection gas sampling port connector (550); The detection gas inlet connector (510), the gas filter device (310), the detection gas pressure reducing valve and the oil-gas separator (390), the gas drying device (340), the measuring gas flow meter (330), the gas detector (320) and the detection gas exhaust connector (520) are sequentially connected through pipelines and form a delivery channel for the detection gas to pass through; The sampling three-way hand valve (360) is arranged on the pipeline between the detection gas pressure reducing valve and the oil-gas separator (390) and the gas drying device (340); the first inlet of the sampling three-way hand valve (360) is connected to the outlet of the detection gas pressure reducing valve and the oil-gas separator (390) through the pipeline; the first outlet of the sampling three-way hand valve (360) is connected to the inlet of the gas drying device (340) through the pipeline; and the second outlet of the sampling three-way hand valve (360) is connected to the detection gas sampling port connector (550) through the pipeline; The gas detector drain port connector (530) is connected to the drain port of the gas detector (320) via a pipeline.

2. The fixed bed reactor circulating gas detection system according to claim 1, characterized in that: It also includes an exhaust flow regulating valve (380), the two ports of which are respectively connected to the inlet of the measuring gas flow meter (330) and the outlet of the gas detector (320) through pipelines.

3. The fixed bed reactor circulating gas detection system according to claim 1, characterized in that: It also includes a gas filter device drain port connector (540) and a drain solenoid valve (370); the gas filter device drain port connector (540) is connected to the gas filter device (310) drain port connector via a pipeline; the drain solenoid valve (370) is arranged on the pipeline between the gas filter device drain port connector (540) and the gas filter device (310) drain port connector.

4. The fixed bed reactor circulating gas detection system according to claim 3, characterized in that: It also includes a cabinet (100), wherein the gas filter device (310), the gas detector (320), the measuring gas flow meter (330), the gas drying device (340), the detection gas pressure reducing valve and the oil-gas separator (390), and the sampling three-way manual valve (360) are all arranged in the cabinet (100); The gas filter device drain port connector (540), the detection gas inlet connector (510), the detection gas exhaust port connector (520), the gas detector drain port connector (530) and the detection gas sampling port connector (550) are all fixed to the side wall of the cabinet (100), and their respective ends extend out of the cabinet (100).

5. The fixed bed reactor circulating gas detection system according to claim 1, characterized in that: It also includes a booster exhaust pump (200), the detection gas exhaust port connector (520) is connected to the inlet of the booster exhaust pump (200) through a pipeline, and the outlet of the booster exhaust pump (200) is connected to an external gas storage tank through a pipeline.

6. The fixed bed reactor circulating gas detection system according to claim 5, characterized in that: A check valve (210) is provided at the outlet of the boosting and exhausting pump (200).

Images