Gas pretreatment system for analytical instrument

Abstract

The utility model discloses a gas pretreatment system for an analytical instrument, which relates to the technical field of gas pretreatment, and comprises an analysis cabinet and an analyzer, an electronic refrigerator is arranged in the analysis cabinet, one side of the analysis cabinet is provided with an atmosphere inlet, one end of the atmosphere inlet is also provided with an atmosphere secondary filter, and the other end of the atmosphere secondary filter is provided with an air outlet. An air pump is arranged at the other end of the atmosphere secondary filter, a main molecular sieve is arranged at the outlet end of the air pump, an auxiliary molecular sieve is fixedly installed at one end of the main molecular sieve, an atmosphere fine filter is arranged at the other end of the auxiliary molecular sieve, and an atmosphere flow stabilizer is arranged at the other end of the atmosphere fine filter; according to the system, purified gas is adopted to replace instrument air or nitrogen to carry out purging protection on high-precision optical components, the operation cost is saved, and the trouble that nitrogen is bought or a pressure container cannot be used is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of gas pretreatment, in particular to a gas pretreatment system for an analytical instrument. Background Technique

[0002] In the process of oil extraction, gas detection for mud logging is of utmost importance. During oil extraction, the gas carried by the drilling fluid returned from the bottom of the well can be obtained from the degasser. By detecting and analyzing such gas, the oil-gas-water layer can be preliminarily judged, and the heavy oil layer or light oil layer can also be judged. However, since the mud logging gas is a mixed gas with various complex chemical components and is generally acidic, and due to the high gas humidity and complex composition, gas pretreatment is required when detecting such gas.

[0003] In the prior art, the most important part in an on-line gas analyzer is the interferometer, which is a high-precision optical component. During the use of the interferometer, in order to prevent moisture, carbon dioxide, dust, etc. in the air from entering and affecting the detection accuracy, instrument air or nitrogen is usually used for purging to form a slightly positive pressure to prevent external factors from interfering. At the same time, the on-line analytical instrument requires zero gas to perform zero calibration, thereby forming a background value. In the industry, high-purity inert gas is usually used as the zero gas. The high-purity inert gas needs to be produced and filled into cylinders at the calibration gas factory and then can be used on-site. It not only has a high use cost, but also has disadvantages such as limited use environment and short time. Content of the Utility Model

[0004] In view of the above technical problems, the utility model proposes the following technical solutions:

[0005] A gas pretreatment system for an analytical instrument, including an analysis cabinet and an analyzer. The analyzer is arranged in the analysis cabinet. A detection gas chamber is arranged in the analyzer. A gas inlet and a gas outlet are arranged on the detection gas chamber to allow the sample gas to enter and exit the analyzer for detection. Its characteristics are as follows: An explosion-proof air conditioner is arranged outside one side of the analysis cabinet to control the temperature of the analysis cabinet. A sample gas inlet, a gas bag inlet, a calibration gas inlet, an atmospheric inlet, a vent port, and a zero calibration port are arranged on the side of the analysis cabinet away from the explosion-proof air conditioner. The sample gas inlet, the gas bag inlet, the calibration gas inlet, the atmospheric inlet, the vent port, and the zero calibration port are all arranged on the same side of the analysis cabinet and are evenly distributed. A grounding bar is also arranged on the side of the analysis cabinet where the atmospheric inlet is arranged to reserve a wiring position;

[0006] An electronic cooler is arranged in the analysis cabinet to cool the pipeline passing through the electronic cooler, so that the electronic cooler condenses the moisture carried by the gas in the pipeline into water droplets.

[0007] Further, a secondary air filter is provided at one end of the air inlet for simple dust removal. An air pump is provided at the other end of the secondary air filter. The pipeline between the air pump and the secondary air filter passes through the electronic cooler, allowing the electronic cooler to cool the gas in the pipeline. A main molecular sieve is provided at the outlet end of the air pump, and a secondary molecular sieve is fixedly installed at one end of the main molecular sieve.

[0008] Further, the main molecular sieve and the secondary molecular sieve serve to remove water and carbon dioxide carried by the passing gas. A fine air filter is provided at the other end of the secondary molecular sieve to filter dust in the gas. An air stabilizer is provided at the other end of the fine air filter. An air flow meter is provided at one end of the air stabilizer. When the air flow meter detects that the gas flow rate is lower than 0.51 L / min, an alarm will be triggered. A purge inlet and a purge outlet are also provided on the analyzer to allow gas to enter the analyzer for purging the instrument. The other end of the air flow meter is connected to the purge inlet on the analyzer, and the purge outlet pipe on the analyzer is also connected to the inlet end of the air pump to recycle the purge gas.

[0009] Further, a first three-way solenoid valve is provided at one end of the sample gas inlet. The pipeline between the sample gas inlet and the first three-way solenoid valve passes through the electronic cooler. A suction pump is fixedly installed at the end of the first three-way solenoid valve away from the electronic cooler to drive gas into the system. A calcium chloride filter for water removal is fixedly provided at one end of the suction pump, and a main fine filter for dust removal is also provided at one end of the calcium chloride filter.

[0010] Further, a second three-way solenoid valve is fixedly installed at one end of the main fine filter. A water blocking filter is fixedly installed at the other end of the second three-way solenoid valve. A sample gas stabilizer is fixedly installed at one end of the water blocking filter. The sample gas stabilizer is used to ensure that the flow rate and pressure of the sample gas are in a stable state. A main flow meter is provided at the other end of the sample gas stabilizer to detect the intake volume of the sample gas. When the main flow meter detects that the gas flow rate is lower than 0.3 L / min, an alarm will be triggered. The outlet end of the main flow meter is provided with a main solenoid valve, and one end of the main solenoid valve is connected to the gas inlet of the analyzer.

[0011] Further, an air bag fine filter for dust removal is provided at one end of the first three-way solenoid valve, and the other end of the air bag fine filter is fixedly connected to the air bag inlet.

[0012] Further, one end of the second three-way solenoid valve is also connected to the calibration gas inlet.

[0013] Further, a vent three-way solenoid valve is provided at the gas outlet end of the analyzer. A absolute pressure sensor is provided on the pipeline between the vent three-way solenoid valve and the analyzer. The absolute pressure sensor is used to convert the pressure in the pipeline into an available output signal for the user to observe the system. The inspection range of the absolute pressure sensor is from 0 to 120 kPa. A secondary water-blocking filter is provided at one end of the vent three-way solenoid valve, and the other end of the secondary water-blocking filter is connected to the vent port.

[0014] Further, a vacuum pump is also provided at one end of the vent three-way solenoid valve. An oil trap is provided at the outlet end of the vacuum pump, and the other end of the oil trap is connected to the zero calibration port.

[0015] The beneficial effects of the present utility model are as follows: (1) Most of the moisture in the gas is removed by an electronic cooler in this system, and then the remaining water and carbon dioxide in the air are removed by the main molecular sieve and the secondary molecular sieve. The dust is removed by an atmospheric fine filter. The purified gas is used to blow and protect the high-precision optical components instead of instrument air or nitrogen, saving the operation cost and eliminating the trouble of buying nitrogen or not being able to use pressure vessels.

[0016] (2) The main solenoid valve and the vent three-way solenoid valve are used to cut off the gas path at both ends of the detection gas chamber in the analyzer. The vacuum pump is used to pump out the gas in the remaining pipeline and the gas chamber, making the detection gas chamber in a vacuum state. Then the spectral information in the vacuum state is collected as the background value for the detection of this system to achieve the zero calibration effect. Description of the Drawings

[0017] Figure 1 It is the integrated gas circuit diagram of the front wellhead remote control system of the present utility model.

[0018] Figure 2 It is the front view of the analysis cabinet of the present utility model.

[0019] Figure 3 It is the left view of the analysis cabinet of the present utility model.

[0020] Figure 4 It is the right view of the analysis cabinet of the present utility model. Detailed Embodiments

[0021] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0022] Such as Figures 1 to 4As shown in the figure, a gas pretreatment system for an analytical instrument includes an analysis cabinet and an analyzer. The analyzer is arranged inside the analysis cabinet. A detection gas chamber is arranged inside the analyzer. A gas inlet and a gas outlet are arranged on the detection gas chamber to allow the sample gas to enter and exit the analyzer for detection. An explosion-proof air conditioner is arranged outside one side of the analysis cabinet to control the temperature of the analysis cabinet. A sample gas inlet, a gas bag inlet, a calibration gas inlet, an atmospheric inlet, a vent port, and a zero calibration port are arranged on the side of the analysis cabinet away from the explosion-proof air conditioner. The sample gas inlet, the gas bag inlet, the calibration gas inlet, the atmospheric inlet, the vent port, and the zero calibration port are all arranged on the same side of the analysis cabinet and are evenly distributed. Water separation pipe joints are arranged at the sample gas inlet, the gas bag inlet, the calibration gas inlet, the atmospheric inlet, the vent port, and the zero calibration port for connecting with external pipelines. A grounding bar is also arranged on the side of the analysis cabinet with the atmospheric inlet to reserve a wire arrangement position. An electronic cooler is arranged inside the analysis cabinet to cool the pipeline passing through the electronic cooler. The purpose is to let the electronic cooler condense the moisture carried by the gas in the pipeline into water droplets, and the peristaltic pump discharges the water droplets to the outside of the analysis cabinet through the pipeline. The electronic cooler will cool the sample gas to obtain a gas sample with a dew point of 2°C.

[0023] As Figure 1 shown in the figure, there are a total of five gas pipelines in this system, namely the on-site gas sample collection and detection pipeline, the on-site sample gas vent pipeline, the gas bag injection and detection pipeline, the calibration gas cylinder injection and detection pipeline, the zero point calibration pipeline, and the interferometer protection and purge pipeline.

[0024] As Figure 1 shown in the figure, the structure of the on-site gas sample collection and detection pipeline is as follows: A first three-way solenoid valve is arranged at one end of the sample gas inlet. The pipeline between the sample gas inlet and the first three-way solenoid valve passes through the electronic cooler. A suction pump is fixedly installed at the end of the first three-way solenoid valve away from the electronic cooler to drive the gas into the system. A calcium chloride filter for water removal is fixedly arranged at one end of the suction pump. A main fine filter for dust removal is also arranged at one end of the calcium chloride filter. A second three-way solenoid valve is fixedly installed at one end of the main fine filter. A water blocking filter is fixedly installed at the other end of the second three-way solenoid valve. A sample gas flow stabilizer is fixedly installed at one end of the water blocking filter. The sample gas flow stabilizer is used to ensure that the flow rate and pressure of the sample gas are in a stable state. A main flow meter is arranged at the other end of the sample gas flow stabilizer to detect the intake volume of the sample gas. When the main flow meter detects that the gas flow rate is lower than 0.3 L / min (the alarm flow rate is adjustable), an alarm will occur. The outlet end of the main flow meter is provided with a main solenoid valve. One end of the main solenoid valve is connected to the gas inlet of the analyzer. It should be noted that the pipeline used for the on-site gas sample collection and detection pipeline is a stainless steel pipe with an outer diameter of six millimeters.

[0025] When the on-site gas sample collection and detection pipeline is in use, the on-site gas sample collection and detection work is as follows: First, the sample gas returned with the drilling fluid is removed by the degasser and then sucked out by the air pump in the cabinet. At this time, a calcium chloride filter should be set between the degasser and the cabinet, so that the sample gas is first simply dehydrated by the on-site calcium chloride filter, and then the sample gas enters this device from the sample gas inlet. When the sample gas enters the electronic condenser, most of the gaseous water will be removed. Then the sample gas passes through the NO and C ports of the first three-way solenoid valve and then enters the calcium chloride filter for further water removal. In this way, the water molecules carried by the sample gas can be greatly reduced. The sample gas enters the main fine filter for dust removal, and then the sample gas passes through the NO and C ports of the second three-way solenoid valve. After that, the sample gas enters the main water-blocking filter. The main water-blocking filter separates the polymer and dust in the sample gas, effectively reducing the potential damage of these impurities to the analyzer. Then the gas enters the sample gas flow stabilizer, and the sample gas flow stabilizer controls the flow rate and pressure of the sample gas to ensure that the flow rate and pressure of the sample gas are in a stable state, avoiding errors in detection caused by fluctuations in flow rate and pressure. After the sample gas passes through the main flow meter, the main flow meter detects the flow rate of the sample gas. When the flow rate of the sample gas is lower than 0.3 L / min (the alarm flow rate is adjustable), an alarm will occur. After the sample gas passes through the main flow meter and then through the main solenoid valve, it will enter the detection gas chamber in the analyzer for detection work.

[0026] As Figure 1 shown, the structure of the on-site sample gas venting pipeline of this system is as follows: A venting three-way solenoid valve is set at the gas outlet end of the analyzer. An absolute pressure sensor is set on the pipeline between the venting three-way solenoid valve and the analyzer. The absolute pressure sensor is used to convert the pressure in the pipeline into an available output signal for the user to observe this system. The inspection range of the absolute pressure sensor is from 0 to 120 kPa. One end of the venting three-way solenoid valve is provided with a secondary water-blocking filter, and the other end of the secondary water-blocking filter is connected to the venting port. It should be noted here that the pipeline used for the on-site sample gas venting pipeline is a stainless steel pipe with an outer diameter of 8 mm.

[0027] When the on-site sample gas venting pipeline of this system is in use: When the sample gas in the detection gas chamber flows out from the gas outlet, the sample gas passes through the C and NO ports of the venting three-way solenoid valve, and then is vented to the atmosphere through the venting port after passing through the secondary water-blocking filter.

[0028] As Figure 1As shown in the figure, the structure of the air bag sampling detection pipeline of this system is as follows: A fine filter for the air bag is provided at one end of the air bag inlet to remove dust. The other end of the fine filter for the air bag is connected to the first three-way solenoid valve. Then, a part of the structure of the on-site gas sample collection and detection pipeline is borrowed to allow the sample gas to enter the analyzer. It should be noted that the pipeline used for the air bag sampling detection pipeline is a stainless steel pipe with an outer diameter of 6 mm. When using the air bag sampling detection pipeline, first switch the first three-way solenoid valve to open the channel between the fine filter for the air bag and the suction pump and close the channel between the sample gas inlet and the suction pump. Then, the sample gas in the external air bag is driven by the suction pump to enter the pipeline. After that, the sample gas passes through the fine filter for the air bag to remove dust and reduce impurities in the sample gas. Then, the sample gas passes through the calcium chloride filter to remove water, and then passes through the fine filter and the main water-blocking filter. Then, it passes through the sample gas flow stabilizer, the main flowmeter, and the main solenoid valve and then enters the detection gas chamber. After passing through the detection gas chamber in the analyzer, the sample gas will enter the on-site sample gas vent pipeline and be discharged into the atmosphere.

[0029] As Figure 1 shown in the figure, the structure of the standard gas cylinder sampling detection pipeline of this system is as follows: One end of the second three-way solenoid valve is also connected to the standard gas inlet. Then, a part of the structure of the on-site gas sample collection and detection pipeline is borrowed to allow the sample gas to enter the analyzer. When using the standard gas cylinder sampling detection pipeline, it is necessary to first switch the second three-way solenoid valve to open the channel between the standard gas inlet and the main water-blocking filter and close the channel between the main fine filter and the main water-blocking filter. In this way, the standard gas in the standard gas cylinder can enter the standard gas inlet due to the pressure in the cylinder. Then, it enters the water-blocking filter through the NC and C ports of the second three-way solenoid valve. Then, it passes through the main flow stabilizer, the main flowmeter, and the main solenoid valve and then enters the detection gas chamber in the analyzer. After passing through the detection gas chamber in the analyzer, the sample gas will enter the on-site sample gas vent pipeline and be discharged into the atmosphere.

[0030] As Figure 1As shown in the figure, the structure of the interferometer protection purge pipeline of the system is as follows: One end of the air inlet is also provided with a secondary air filter for simple dust removal. The other end of the secondary air filter is provided with an air pump. The pipeline between the air pump and the secondary air filter passes through the electronic cooler to allow the electronic cooler to cool the gas in the pipeline. The outlet end of the air pump is provided with a main molecular sieve. One end of the main molecular sieve is fixedly installed with a secondary molecular sieve. The main molecular sieve and the secondary molecular sieve play a role in removing water and carbon dioxide carried by the passing gas. The other end of the secondary molecular sieve is provided with a fine air filter for filtering dust in the gas. The other end of the fine air filter is provided with an air stabilizer. One end of the air stabilizer is provided with an air flow meter. When the air flow meter detects that the gas flow is lower than 0.51 L / min, an alarm will be triggered. The analyzer is also provided with a purge inlet and a purge outlet for allowing gas to enter the analyzer to purge the instrument, thereby cleaning the optical path in the instrument to ensure the detection accuracy of the instrument. The other end of the air flow meter is connected to the purge inlet on the analyzer. The purge outlet pipe on the analyzer is also connected to the inlet end of the air pump for recycling the purge gas. It should be noted that the pipeline used for the interferometer protection purge pipeline is a stainless steel pipe with an outer diameter of six millimeters.

[0031] When the interferometer protection purge pipeline of the system is in use, the air pump will suck air from the air inlet into the pipeline. After that, water is removed by the electronic cooler. Then the gas passes through the air pump again, and then through the main molecular sieve and the secondary molecular sieve, allowing the main molecular sieve and the secondary molecular sieve to remove the water and carbon dioxide carried by the gas. Then the gas passes through the fine air filter, allowing the fine air filter to remove the dust in the gas. After that, a flow stabilization and pressure regulation operation is carried out through the air stabilizer to make the gas flow stably with a slightly positive pressure. Then the gas passes through the air flow meter and enters the analyzer, thereby replacing instrument air or nitrogen to purge and protect the precision optical components in the analyzer. The gas that has passed through the analyzer will return to the air pump for recycling.

[0032] As Figure 1As shown in the figure, the zero-point calibration pipeline structure of the system is as follows: A vacuum pump is also provided at one end of the vent three-way solenoid valve. The outlet end of the vacuum pump is provided with an oil mist collector. The other end of the oil mist collector is connected to the zero calibration port. It should be noted that the pipeline used for the zero-point calibration pipeline is a stainless steel pipe with an outer diameter of 8 mm. When the zero-point calibration pipeline is in use, first close the main solenoid valve to close the channel between the main flowmeter and the analyzer. Then switch the vent three-way solenoid valve to close the channel between the secondary water-blocking filter and the analyzer. Then open the channel between the vacuum pump and the analyzer. In this case, start the vacuum pump to let the vacuum pump pump the gas in the remaining pipeline and the gas chamber through the oil mist collector to the outside of the zero calibration port, so that the detection gas chamber forms a vacuum state. Then the analyzer collects the spectral information in the detection gas chamber in the vacuum state, so that the detection data in the vacuum state is used as the background value to achieve the effect of zero calibration.

[0033] As Figure 1 shown, the three through holes of the first three-way solenoid valve, the second three-way solenoid valve, and the vent three-way solenoid valve are all composed of NO, NC, and C. The NO is a normally open port, the NC is a normally closed port, and the C is the liquid outlet. The NO port of the first three-way solenoid valve is connected to the electronic cooler. The NC port of the first three-way solenoid valve is connected to the air bag fine filter. The C port of the first three-way solenoid valve is connected to the air extraction pump. The NO port of the second three-way solenoid valve is connected to the main fine filter. The NC port of the second three-way solenoid valve is connected to the standard gas inlet. The C port of the second three-way solenoid valve is connected to the main water-blocking filter. The NO port of the vent three-way solenoid valve is connected to the secondary water-blocking filter. The NC port of the vent three-way solenoid valve is connected to the vacuum pump. The C port of the vent three-way solenoid valve is connected to the analyzer.

[0034] Working principle of this system: When this system is working, start the explosion-proof air conditioner outside the analysis cabinet to let the explosion-proof air conditioner control the temperature inside the analysis cabinet, so as to ensure that the ambient temperature for the use of the analyzer is the better working temperature of the instrument. Then, on-site gas sample collection and detection can be carried out. First, the sample gas returned with the drilling fluid is removed by the degasser and then sucked out by the air extraction pump in the cabinet. At this time, a calcium chloride filter should be set between the degasser and the cabinet, so that the sample gas is first simply dehydrated by the on-site calcium chloride filter, and then the sample gas enters this device from the sample gas inlet. When the sample gas enters the electronic condenser, most of the gaseous water will be removed. Then the sample gas enters the calcium chloride filter again to remove water through the NO and C ports of the first three-way solenoid valve. In this way, the water molecules carried by the sample gas can be greatly reduced. The sample gas enters the main fine filter from the calcium chloride filter for dust removal. Then the sample gas passes through the NO and C ports of the second three-way solenoid valve again. After that, when the sample gas enters the main water-blocking filter, the main water-blocking filter separates the polymer and dust in the sample gas, effectively reducing the potential damage of these impurities to the analyzer. Then the gas enters the sample gas flow stabilizer, and the sample gas flow stabilizer controls the flow rate and pressure of the sample gas to ensure that the flow rate and pressure of the sample gas are in a stable state, avoiding errors in detection caused by fluctuations in flow rate and pressure. After the sample gas passes through the main flowmeter, the main flowmeter detects the flow rate of the sample gas. When the flow rate of the sample gas is lower than 0.3 L / min, an alarm will occur. After the sample gas passes through the main flowmeter and then through the main solenoid valve, it will enter the detection gas chamber in the analyzer for detection work. After the sample gas in the detection gas chamber flows out from the gas outlet, the sample gas passes through the C and NO ports of the vent three-way solenoid valve, and then is vented to the atmosphere through the vent port after passing through the auxiliary water-blocking filter.

[0035] When detecting the gas in the gas bag, first switch the first three-way solenoid valve to open the channel between the gas bag fine filter and the air extraction pump and close the channel between the sample gas inlet and the air extraction pump. In this way, the gas passes through the NC and C ports of the first three-way solenoid valve. Then the sample gas in the external gas bag is driven by the air extraction pump into the pipeline. After that, the sample gas passes through the gas bag fine filter for dust removal to reduce the impurities in the sample gas. Then the sample gas passes through the calcium chloride filter for water removal, and then through the fine filter and the main water-blocking filter. Then it passes through the sample gas flow stabilizer, the main flowmeter, and the main solenoid valve and then enters the detection gas chamber. After passing through the detection gas chamber in the analyzer, the sample gas will go onto the on-site sample gas vent pipeline and be discharged into the atmosphere.

[0036] When the analyzer of this system needs to be tested, the standard gas in the standard gas bottle needs to be tested. At this time, it is necessary to switch the second three-way solenoid valve first, let the second three-way solenoid valve open the channel between the standard gas inlet and the main water-blocking filter, and close the channel between the main fine filter and the main water-blocking filter. In this way, the standard gas in the standard gas bottle can enter the standard gas inlet by the pressure in the bottle, and then enter the water-blocking filter through the NC and C ports of the second three-way solenoid valve, and then pass through the main stabilizer, the main flow meter and the main solenoid valve, and then enter the detection gas chamber in the analyzer. After passing through the detection gas chamber in the analyzer, the sample gas will go to the on-site sample gas vent pipeline and then be discharged into the atmosphere.

[0037] During the use of this system, when the high-precision optical components in the analyzer need to be purged, the air pump will suck the atmosphere into the pipeline from the atmospheric inlet, and then pass through the electronic refrigerator to remove water, and then the gas passes through the air pump, and then the gas passes through the main molecular sieve and the secondary molecular sieve, allowing the main molecular sieve and the secondary molecular sieve to remove the water and carbon dioxide carried by the gas, and the gas passes through the atmospheric fine filter, allowing the atmospheric fine filter to remove the dust in the gas, and then the gas flow stabilizer is used to stabilize the flow and pressure, so that the gas forms a slight positive pressure and then flows stably, and then the gas passes through the atmospheric flow meter and enters the analyzer, thereby replacing the instrument air or nitrogen to purge and protect the precision optical components in the analyzer, and the gas that has passed through the analyzer will return to the air pump for recycling.

[0038] When the system needs to perform zero point calibration, first close the main solenoid valve to close the channel between the main flowmeter and the analyzer, then switch the vent three-way solenoid valve to close the channel between the secondary water-blocking filter and the analyzer, and then open the channel between the vacuum pump and the analyzer. In this case, start the vacuum pump to allow the vacuum pump to pump the gas in the remaining pipelines and air chambers through the C and NC ports of the vent three-way solenoid valve, and then allow the gas to pass through the oil mist collector and be pumped to the outside of the zero port to form a vacuum state in the detection chamber. Then the analyzer collects the spectral information in the detection chamber under the vacuum state, so that the detection data under the vacuum state can be used as the background value to achieve the effect of zero calibration.

[0039] Here you need to Figure 1 Explain the symbols in Figure 1 T3 OD SS TUBING, which means stainless steel tube with an outer diameter of six millimeters. Figure 1 T4 OD SS TUBING, which means stainless steel tube with an outer diameter of 8 mm. Figure 1 PI in the middle is the pressure display. Figure 1 FI stands for flow rate display. Figure 1 F stands for FILITER, which means filter.Figure 1 In this, B is BULKHEAD UNION, which means riser joint.

[0040] The above are only the preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims

1. A gas pretreatment system for an analytical instrument, comprising an analytical cabinet and an analyzer. The analyzer is arranged inside the analytical cabinet. A detection gas chamber is arranged inside the analyzer. A gas inlet and a gas outlet are arranged on the detection gas chamber for allowing a sample gas to enter and exit the analyzer for detection. It is characterized in that: An explosion-proof air conditioner is provided outside one side of the analysis cabinet for temperature control of the analysis cabinet. A sample gas inlet, a gas bag inlet, a calibration gas inlet, an ambient air inlet, a vent port, and a zero calibration port are provided on the side of the analysis cabinet away from the explosion-proof air conditioner. The sample gas inlet, the gas bag inlet, the calibration gas inlet, the ambient air inlet, the vent port, and the zero calibration port are all provided on the same side of the analysis cabinet and are evenly distributed. A grounding bar is also provided on the side of the analysis cabinet with the ambient air inlet to reserve a wire routing position. An electronic cooler is provided inside the analysis cabinet to cool the pipeline passing through the electronic cooler, aiming to make the electronic cooler condense the moisture carried by the gas in the pipeline into water droplets.

2. The gas pretreatment system for an analytical instrument according to claim 1, wherein: An ambient air secondary filter for simple dust removal is provided at one end of the ambient air inlet. An air pump is provided at the other end of the ambient air secondary filter. The pipeline between the air pump and the ambient air secondary filter passes through the electronic cooler to allow the electronic cooler to cool the gas in the pipeline. A main molecular sieve is provided at the outlet end of the air pump, and a secondary molecular sieve is fixedly installed at one end of the main molecular sieve.

3. The gas pretreatment system for an analytical instrument according to claim 2, wherein: The main molecular sieve and the secondary molecular sieve function to remove the water and carbon dioxide carried by the passing gas. An ambient air fine filter for filtering dust in the gas is provided at the other end of the secondary molecular sieve. An ambient air flow stabilizer is provided at the other end of the ambient air fine filter. An ambient air flow meter is provided at one end of the ambient air flow stabilizer. When the gas flow detected by the ambient air flow meter is lower than 0.51 L / min, an alarm will occur. A purge inlet and a purge outlet are also provided on the analyzer to allow gas to enter the analyzer for purging the instrument. The other end of the ambient air flow meter is connected to the purge inlet on the analyzer, and the purge outlet pipe on the analyzer is also connected to the inlet end of the air pump to recycle the purge gas.

4. The gas pretreatment system for an analytical instrument according to claim 1, wherein: A first three-way solenoid valve is provided at one end of the sample gas inlet. The pipeline between the sample gas inlet and the first three-way solenoid valve passes through the electronic cooler. A suction pump for driving gas into the system is fixedly installed at the end of the first three-way solenoid valve away from the electronic cooler. A calcium chloride filter for water removal is fixedly provided at one end of the suction pump. A main fine filter for dust removal is also provided at one end of the calcium chloride filter.

5. The gas pretreatment system for an analytical instrument according to claim 4, wherein: A second three-way solenoid valve is fixedly installed at one end of the main fine filter. A water blocking filter is fixedly installed at the other end of the second three-way solenoid valve. A sample gas flow stabilizer is fixedly installed at one end of the water blocking filter. The sample gas flow stabilizer is used to ensure that the flow rate and pressure of the sample gas are in a stable state. A main flow meter for detecting the sample gas intake is provided at the other end of the sample gas flow stabilizer. When the gas flow detected by the main flow meter is lower than 0.3 L / min, an alarm will occur. A main solenoid valve is provided at the outlet end of the main flow meter, and one end of the main solenoid valve is connected to the gas inlet of the analyzer.

6. The gas pretreatment system for an analytical instrument according to claim 4, wherein: An air bag fine filter for dust removal is also provided at one end of the first three-way solenoid valve. The other end of the air bag fine filter is fixedly connected to the air bag inlet.

7. The gas pretreatment system for an analytical instrument according to claim 5, wherein: One end of the second three-way solenoid valve is also connected to the calibration gas inlet.

8. The gas pretreatment system for an analytical instrument according to claim 1, wherein: A vent three-way solenoid valve is provided at the gas outlet end of the analyzer. An absolute pressure sensor is provided on the pipeline between the vent three-way solenoid valve and the analyzer. The absolute pressure sensor is used to convert the pressure in the pipeline into an available output signal for the user to observe the system. The inspection range of the absolute pressure sensor is from 0 to 120 kPa. A secondary water-blocking filter is provided at one end of the vent three-way solenoid valve, and the other end of the secondary water-blocking filter is connected to the vent port.

9. The gas pretreatment system for an analytical instrument according to claim 8, characterized in that: A vacuum pump is also provided at one end of the vent three-way solenoid valve. An oil trap is provided at the outlet end of the vacuum pump, and the other end of the oil trap is connected to the zero calibration port.

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