A reactor tail gas purification system and trace oxygen analyzer equipment

Abstract

The utility model relates to the technical field of trace oxygen analyzers, and in particular to a reactor tail gas purification system and a trace oxygen analyzer device. The reactor tail gas purification system provided by the present application comprises a desulfurization device, the desulfurization device comprises an alkali liquid tank, a water washing tank, a first connecting pipe and a second connecting pipe, the alkali liquid tank contains alkali liquid, the water washing tank contains clean water, since the tail gas sampling tube is connected to the alkali liquid tank, the tail gas is passed into the alkali liquid for cleaning, so that most of the sulfides in the tail gas can be cleaned by the alkali liquid, since one end of the first connecting pipe is connected to the alkali liquid tank, and the other end is connected to the water washing tank, the tail gas after being cleaned by the alkali liquid can be passed into the clean water for cleaning again, so as to clean the alkali liquid attached to the tail gas, the tail gas with sulfide removed is then dehydrated by the dehydration device and filtered by the filtering device in turn, and the sulfide, moisture and particulate matter in the tail gas after the final purification are greatly reduced, thereby ensuring the detection accuracy of the electrochemical oxygen sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of trace oxygen analyzers, in particular to a reactor tail gas purification system and trace oxygen analyzer equipment. Background Art

[0002] In the process of chemical plant reaction, in order to understand the reaction of the reactor and ensure the safety of the reaction, it is necessary to adjust the reaction parameters in time, so it is necessary to detect the concentration of oxygen in the reactor tail gas. Since the concentration of oxygen in the reactor tail gas is generally within 1000ppm, it can only be detected by electrochemical oxygen sensor. However, for gases containing high moisture, particulate matter, hydrogen sulfide, sulfide and other components, it will affect the detection accuracy of electrochemical oxygen sensor, causing pollution of oxygen line analysis detection pool, reducing the service life of trace oxygen analyzer, and even failure to use. Utility Model Content

[0003] The present application provides a reactor tail gas purification system and a trace oxygen analyzer device, which to a certain extent improves the technical problem in the related art that the gas containing multiple components such as high hydrogen sulfide and sulfide will affect the detection accuracy of the electrochemical oxygen sensor.

[0004] In a first aspect, an embodiment of the present application provides a reactor tail gas purification system, comprising:

[0005] An exhaust gas sampling tube is used to introduce exhaust gas;

[0006] A desulfurization device, comprising an alkali liquid tank, a water washing tank, a first connecting pipe and a second connecting pipe, wherein the alkali liquid tank contains alkali liquid, the water washing tank contains clean water, the tail gas sampling pipe is connected to the alkali liquid tank so as to pass the tail gas into the alkali liquid for cleaning, one end of the first connecting pipe is connected to the alkali liquid tank, and the other end is connected to the water washing tank so as to pass the tail gas cleaned by the alkali liquid into the clean water for cleaning, and one end of the second connecting pipe is connected to the water washing tank;

[0007] A dewatering device, wherein the other end of the second connecting pipe is connected to the dewatering device so as to pass the tail gas washed with the clean water into the dewatering device for dewatering;

[0008] The filter device is connected with the water removal device to pass the tail gas after water removal into the filter device for filtering.

[0009] In some embodiments, the exhaust gas sampling tube extends below the liquid surface of the alkali liquid tank, one end of the first connecting tube is arranged above the liquid surface of the alkali liquid tank, and the other end extends below the liquid surface of the water washing tank, and one end of the second connecting tube is arranged above the liquid surface of the water washing tank.

[0010] In some embodiments, the exhaust gas sampling tube is arranged on one side of the alkali liquid tank, and the first connecting tube is arranged on the other side of the alkali liquid tank; the first connecting tube is arranged on one side of the water washing tank, and the second connecting tube is arranged on the other side of the water washing tank.

[0011] In some embodiments, the water removal device includes a first gas-liquid separator, a condensation mechanism, and a second gas-liquid separator connected in sequence, the second connecting pipe is connected to the first gas-liquid separator, the condensation mechanism is used to condense the exhaust gas, and the second gas-liquid separator is connected to the filtering device.

[0012] In some embodiments, the condensing mechanism includes a condensing coil and a refrigeration assembly, one end of the condensing coil is connected to the first gas-liquid separator, and the other end is connected to the second gas-liquid separator, and the refrigeration assembly is used to cool the condensing coil so that the condensing coil condenses the exhaust gas.

[0013] In some embodiments, the refrigeration assembly includes a third connecting pipe, a pressure reducing valve and a condenser, the third connecting pipe is used to allow air to pass through, the pressure reducing valve is arranged at the inlet of the third connecting pipe, the condenser is arranged at the outlet of the third connecting pipe to generate cold air, and the air outlet of the condenser is aligned with the condensing coil to cool the condensing coil.

[0014] In some embodiments, the condensing mechanism also includes a heating component, which includes a temperature sensor, a temperature controller and an electric heater. The temperature sensor and the electric heater are both arranged on the peripheral side of the condensing coil. When the temperature sensor detects that the temperature is lower than n, the temperature controller controls the electric heater to start heating; when the temperature sensor detects that the temperature is higher than m, the temperature controller controls the electric heater to stop heating.

[0015] In some embodiments, the filtering device includes a detoxification tank, a drying tank, and a precision filter which are connected in sequence, and the detoxification tank is connected to the water removal device.

[0016] In some embodiments, the system further includes a processing box, and the tail gas sampling tube, the desulfurization device, the water removal device and the filtering device are all disposed in the filtering box.

[0017] In a second aspect, an embodiment of the present application provides a trace oxygen analyzer device, including an oxygen analyzer and a reactor exhaust gas purification system as described above, wherein the filtering device is connected to the oxygen analyzer.

[0018] The beneficial effects of this application are as follows:

[0019] The present application provides a reactor tail gas purification system and trace oxygen analyzer equipment, including a desulfurization device, the desulfurization device including an alkali liquid tank, a water washing tank, a first connecting pipe and a second connecting pipe, the alkali liquid tank contains alkali liquid, the water washing tank contains clean water, since the tail gas sampling tube is connected to the alkali liquid tank, so that the tail gas is passed into the alkali liquid for cleaning, so that most of the sulfides in the tail gas can be washed away by the alkali liquid, since one end of the first connecting pipe is connected to the alkali liquid tank, and the other end is connected to the water washing tank, so that the tail gas after being washed with the alkali liquid can be passed into the clean water for cleaning again, so as to wash away the alkali liquid attached to the tail gas, and the tail gas with sulfides removed is then dehydrated by the dehydration device and filtered by the filtering device in turn, and the sulfides, moisture and particulate matter in the tail gas after the final purification are greatly reduced, thereby ensuring the detection accuracy of the electrochemical oxygen sensor, ensuring the normal use of the online trace oxygen analyzer, keeping the reactor within a controllable range, and ensuring safe and stable production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model.

[0021] Figure 1 A schematic diagram of the structure of a trace oxygen analyzer device provided in an embodiment of the present application.

[0022] Description of reference numerals:

[0023] 100- tail gas sampling tube, 200- desulfurization device, 210- alkali liquid tank, 220- washing tank, 230- first connecting pipe, 240- second connecting pipe, 300- dewatering device, 310- first gas-liquid separator, 320- condensation mechanism, 321- condensation coil, 322- refrigeration component, 322a- third connecting pipe, 322b- pressure reducing valve, 322c- condenser, 330- second gas-liquid separator, 340- heating component, 341- temperature sensor, 342- temperature controller, 344- electric heater, 400- filtering device, 410- detoxification tank, 420- drying tank, 430- precision filter, 500- sewage discharge pipe, 600- treatment box, 700- oxygen analyzer. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] Combination Figure 1 The embodiment of the present application provides a reactor tail gas purification system, including a tail gas sampling tube 100, a desulfurization device 200, a water removal device 300 and a filter device 400. The tail gas sampling tube 100 is used to pass the reactor tail gas, the desulfurization device 200 is used to remove a large amount of sulfide in the tail gas, the water removal device 300 is used to remove moisture in the tail gas, and the filter device 400 is used to filter out impurities in the tail gas, so that the sulfide, moisture and particulate matter in the tail gas purified by the reactor tail gas purification system of the embodiment of the present application are greatly reduced, thereby ensuring the detection accuracy of the electrochemical oxygen sensor.

[0029] The desulfurization device 200 includes an alkali liquid tank 210, a water washing tank 220, a first connecting pipe 230 and a second connecting pipe 240. The alkali liquid tank 210 contains alkali liquid, the water washing tank 220 contains clean water, the exhaust gas sampling tube 100 is connected to the alkali liquid tank 210 to pass the exhaust gas into the alkali liquid for cleaning, thereby removing a large amount of sulfide in the exhaust gas. One end of the first connecting pipe 230 is connected to the alkali liquid tank 210, and the other end is connected to the water washing tank 220 to pass the exhaust gas after cleaning with alkali liquid into the clean water for cleaning, thereby cleaning the alkali liquid entrained in the exhaust gas.

[0030] One end of the second connecting pipe 240 is connected to the water washing tank 220, and the other end of the second connecting pipe 240 is connected to the dehydration device 300, so that the exhaust gas after cleaning with clean water is passed into the dehydration device 300 for dehydration, thereby reducing the moisture contained in the exhaust gas; the dehydration device 300 is connected to the filtering device 400, so that the exhaust gas after dehydration is passed into the filtering device 400 for filtration, thereby reducing the impurity particles in the exhaust gas.

[0031] The present application provides a reactor tail gas purification system and a trace oxygen analyzer device, including a desulfurization device 200, the desulfurization device 200 includes an alkali liquid tank 210, a water washing tank 220, a first connecting pipe 230 and a second connecting pipe 240, the alkali liquid tank 210 contains alkali liquid, and the water washing tank 220 contains clean water. Since the tail gas sampling tube 100 is connected to the alkali liquid tank 210, the tail gas is passed into the alkali liquid for cleaning, so that most of the sulfides in the tail gas can be washed away by the alkali liquid. Since one end of the first connecting pipe 230 is connected to the alkali liquid tank 210 and the other end is connected to the water washing tank 220, the tail gas washed with the alkali liquid can be passed into the clean water for cleaning again to wash away the alkali liquid attached to the tail gas. The tail gas with sulfide removed is then dehydrated by the dehydration device 300 and filtered by the filtering device 400 in sequence, and the sulfide, moisture and particulate matter in the tail gas after the final purification are greatly reduced, thereby ensuring the detection accuracy of the electrochemical oxygen sensor.

[0032] In some embodiments, in order to achieve the cleaning of the tail gas in the alkali solution and the cleaning of the tail gas in the clean water, the tail gas sampling tube 100 extends below the liquid level of the alkali solution tank 210, so that the tail gas discharged through the tail gas sampling tube 100 automatically enters the alkali solution for cleaning, and one end of the first connecting tube 230 is arranged above the liquid level of the alkali solution tank 210, so that the tail gas fully cleaned in the alkali solution automatically enters the first connecting tube 230 after leaving the alkali solution liquid level under the action of density. The other end of the first connecting tube 230 extends below the liquid level of the water washing tank 220, that is, the tail gas discharged through the other end of the first connecting tube 230 automatically enters the clean water for cleaning, and one end of the second connecting tube 240 is arranged above the liquid level of the water washing tank 220, so that the tail gas fully cleaned in the clean water automatically enters the second connecting tube 240 after leaving the clean water liquid level under the action of density.

[0033] After the tail gas enters the alkali solution, due to the density difference, the tail gas will rise in the alkali solution, and in this process, it can fully react with the alkali solution to clean the contained sulfides. Therefore, in order to improve the cleaning effect of sulfides in the tail gas, the tail gas sampling tube 100 can be extended to the lowest point in the alkali solution, so that after the tail gas is discharged through the tail gas sampling tube 100, it will react for a longer time before leaving the liquid surface, so that the cleaning of sulfides is more thorough.

[0034] Similarly, the other end of the first connecting pipe 230 also extends to the lowest point below the liquid surface of the washing tank 220 to improve the cleaning effect of the alkaline solution.

[0035] In some embodiments, in order to further fully clean the tail gas in the alkali solution, the tail gas sampling tube 100 is arranged on one side of the alkali solution tank 210, and the first connecting tube 230 is arranged on the other side of the alkali solution tank 210, that is, after the tail gas is discharged through the tail gas sampling tube 100, the tail gas moves horizontally in the alkali solution and finally leaves the liquid surface and enters the first connecting tube 230. The tail gas that moves horizontally has a longer reaction time with the alkali solution, and the sulfide cleaning is more sufficient. Similarly, the first connecting tube 230 is arranged on one side of the water washing tank 220, and the second connecting tube 240 is arranged on the other side of the water washing tank 220.

[0036] In some embodiments, the tail gas discharged from the water washing tank 220 contains a large amount of water, so a water removal device 300 is required to remove the water in the tail gas. The water removal device 300 includes a first gas-liquid separator 310, a condensation mechanism 320, and a second gas-liquid separator 330 which are connected in sequence, the second connecting pipe 240 is connected to the first gas-liquid separator 310, the condensation mechanism 320 is used to condense the tail gas, and the second gas-liquid separator 330 is connected to the filtering device 400.

[0037] The tail gas first enters the first gas-liquid separator 310 through the second connecting pipe 240 for preliminary gas-liquid separation, and the separated gas enters the condensation mechanism 320 for condensation, and then undergoes sufficient gas-liquid separation again. Most of the separated gas directly enters the filter device 400, and a small amount of gas-liquid mixture enters the second gas-liquid separator 330 for gas-liquid separation, and the separated gas enters the filter device 400. That is, through the three-stage gas-liquid separation operation, the moisture is fully removed.

[0038] In some embodiments, the reactor tail gas purification system also includes a sewage discharge pipe 500, and the alkali liquid tank 210, the water washing tank 220, the first gas-liquid separator 310 and the second gas-liquid separator 330 are all connected to the sewage discharge pipe 500, so that the generated sewage can be discharged through the sewage discharge pipe 500.

[0039] In some embodiments, the condensing mechanism 320 includes a condensing coil 321 and a refrigeration component 322. One end of the condensing coil 321 is connected to the first gas-liquid separator 310, and the other end is connected to the second gas-liquid separator 330. The refrigeration component 322 is used to cool the condensing coil 321 so that the condensing coil 321 condenses the exhaust gas, thereby achieving gas-liquid separation.

[0040] In some embodiments, the refrigeration assembly 322 includes a third connecting pipe 322a, a pressure reducing valve 322b, and a condenser 322c. The third connecting pipe 322a is used to introduce air, the pressure reducing valve 322b is disposed at the inlet of the third connecting pipe 322a, and the condenser 322c is disposed at the outlet of the third connecting pipe 322a to generate cold air. The air outlet of the condenser 322c is aligned with the condenser coil 321 to cool the condenser coil 321. The air may be air compressed with nitrogen. The air enters through the inlet of the third connecting pipe 322a, is depressurized by the pressure reducing valve 322b, and enters the condenser 322c after adjusting the air pressure to generate cold air. The cold air is blown toward the condenser coil 321 through the air outlet of the condenser 322c, thereby cooling the condenser coil 321.

[0041] The condenser 322c may be a vortex condenser 322c, and in order to improve the cooling effect on the condenser coil 321, the number of the condenser 322c may be greater than one, and there is no limitation to this.

[0042] In some embodiments, since the condensing effect on the exhaust gas is best when the condensing coil 321 is in a specific temperature range, the condensing mechanism 320 also includes a heating component 340. The heating component 340 heats or stops heating the condensing coil 321 to keep the temperature of the condensing coil 321 within a specific temperature range, thereby achieving the best condensation effect.

[0043] The heating assembly 340 includes a temperature sensor 341, a temperature controller 342 and an electric heater 344. It is obvious that the temperature sensor 341, the temperature controller 342 and the electric heater 344 are connected to each other by signals. The temperature sensor 341 and the electric heater 344 are both arranged on the peripheral side of the condensing coil 321, so as to accurately measure and heat the temperature of the condensing coil 321. When the temperature sensor 341 detects that the temperature is lower than n, the temperature controller 342 controls the electric heater 344 to start heating; when the temperature sensor 341 detects that the temperature is higher than m, the temperature controller 342 controls the electric heater 344 to stop heating.

[0044] Specifically, the temperature sensor 341 may be disposed in the bending region of the condensing coil 321 , the electric heater 344 may be disposed below the condensing coil 321 , and the value of n may be 3°, and the value of m may be 5°.

[0045] In some embodiments, the filtering device 400 includes a detoxification tank 410, a drying tank 420 and a precision filter 430 which are connected in sequence, and the detoxification tank 410 is connected to the dehydration device 300. Of course, the detoxification tank 410 contains a detoxification agent, and the drying tank 420 contains a desiccant. The detoxification tank 410 is used to remove toxic gases in the gas through the detoxification agent, and the drying tank 420 bravely absorbs trace water vapor in the gas through the desiccant to further reduce the moisture in the tail gas. The precision filter 430 is used to filter out fine impurities in the tail gas, and the precision filter 430 can use a 0.22um precision filter.

[0046] In some embodiments, the system further includes a treatment box 600, in which the tail gas sampling tube 100, the desulfurization device 200, the water removal device 300 and the filter device 400 are all disposed. The treatment box 600 can protect other components of the reactor tail gas purification system, provide an installation basis and improve the integration of the system. The shape of the treatment box 600 can be a cuboid, a cylinder, a cone, etc., which is not limited. The present application provides a reactor tail gas purification system and a trace oxygen analyzer device, including a desulfurization device 200, the desulfurization device 200 includes an alkali liquid tank 210, a water washing tank 220, a first connecting pipe 230 and a second connecting pipe 240, the alkali liquid tank 210 contains alkali liquid, and the water washing tank 220 contains clean water. Since the tail gas sampling tube 100 is connected to the alkali liquid tank 210, the tail gas is passed into the alkali liquid for cleaning, so that most of the sulfides in the tail gas can be washed away by the alkali liquid. Since one end of the first connecting pipe 230 is connected to the alkali liquid tank 210 and the other end is connected to the water washing tank 220, the tail gas washed with the alkali liquid can be passed into the clean water for cleaning again to wash away the alkali liquid attached to the tail gas. The tail gas with sulfide removed is then dehydrated by the dehydration device 300 and filtered by the filtering device 400 in sequence, and the sulfide, moisture and particulate matter in the tail gas after the final purification are greatly reduced, thereby ensuring the detection accuracy of the electrochemical oxygen sensor.

[0047] Based on the same inventive concept, the embodiment of the present application also provides a trace oxygen analyzer device, including an oxygen analyzer 700 and the above reactor tail gas purification system, and the filter device 400 is connected to the oxygen analyzer 700. That is, the tail gas purified by the above reactor tail gas purification system is analyzed when entering the oxygen analyzer 700. The beneficial effects of the trace oxygen analyzer device are the same as those of the above reactor tail gas purification system, and will not be repeated here.

[0048] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0049] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A reactor tail gas purification system, characterized in that: include: An exhaust gas sampling tube is used to introduce exhaust gas; A desulfurization device, comprising an alkali liquid tank, a water washing tank, a first connecting pipe and a second connecting pipe, wherein the alkali liquid tank contains alkali liquid, the water washing tank contains clean water, the tail gas sampling pipe is connected to the alkali liquid tank so as to pass the tail gas into the alkali liquid for cleaning, one end of the first connecting pipe is connected to the alkali liquid tank, and the other end is connected to the water washing tank so as to pass the tail gas cleaned by the alkali liquid into the clean water for cleaning, and one end of the second connecting pipe is connected to the water washing tank; A dewatering device, wherein the other end of the second connecting pipe is connected to the dewatering device so as to pass the tail gas washed with the clean water into the dewatering device for dewatering; The filter device is connected with the water removal device to pass the tail gas after water removal into the filter device for filtering.

2. The reactor tail gas purification system according to claim 1, characterized in that: The exhaust gas sampling tube extends below the liquid surface of the alkali liquid tank, one end of the first connecting tube is arranged above the liquid surface of the alkali liquid tank, and the other end extends below the liquid surface of the water washing tank, and one end of the second connecting tube is arranged above the liquid surface of the water washing tank.

3. The reactor tail gas purification system according to claim 2, characterized in that: The exhaust gas sampling tube is arranged on one side of the alkali liquid tank, and the first connecting tube is arranged on the other side of the alkali liquid tank; the first connecting tube is arranged on one side of the water washing tank, and the second connecting tube is arranged on the other side of the water washing tank.

4. The reactor tail gas purification system according to claim 1, characterized in that: The dehydration device includes a first gas-liquid separator, a condensation mechanism, and a second gas-liquid separator which are connected in sequence, the second connecting pipe is connected to the first gas-liquid separator, the condensation mechanism is used to condense the tail gas, and the second gas-liquid separator is connected to the filtering device.

5. The reactor tail gas purification system according to claim 4, characterized in that: The condensing mechanism includes a condensing coil and a refrigeration component. One end of the condensing coil is connected to the first gas-liquid separator, and the other end is connected to the second gas-liquid separator. The refrigeration component is used to cool the condensing coil so that the condensing coil condenses the exhaust gas.

6. The reactor tail gas purification system according to claim 5, characterized in that: The refrigeration assembly includes a third connecting pipe, a pressure reducing valve and a condenser. The third connecting pipe is used to allow air to enter. The pressure reducing valve is arranged at the inlet of the third connecting pipe. The condenser is arranged at the outlet of the third connecting pipe to generate cold air. The air outlet of the condenser is aligned with the condensing coil to cool the condensing coil.

7. The reactor tail gas purification system according to claim 5, characterized in that: The condensing mechanism also includes a heating component, which includes a temperature sensor, a temperature controller and an electric heater. The temperature sensor and the electric heater are both arranged on the circumference of the condensing coil. When the temperature sensor detects that the temperature is lower than n, the temperature controller controls the electric heater to start heating; when the temperature sensor detects that the temperature is higher than m, the temperature controller controls the electric heater to stop heating.

8. The reactor tail gas purification system according to any one of claims 1 to 7, characterized in that: The filtering device comprises a detoxification tank, a drying tank and a precision filter which are connected in sequence, and the detoxification tank is connected to the dewatering device.

9. The reactor tail gas purification system according to any one of claims 1 to 7, characterized in that: The system further comprises a processing box, in which the tail gas sampling tube, the desulfurization device, the water removal device and the filtering device are all arranged.

10. A trace oxygen analyzer device, characterized in that: It comprises an oxygen analyzer and a reactor tail gas purification system as described in any one of claims 1 to 9, wherein the filtering device is connected to the oxygen analyzer.

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