KR100900614B1 - An apparatus for analyzing the ingredient of gas in ironworks - Google Patents

Abstract

The present invention relates to an apparatus for analyzing the components of by-product gas generated in steel mills.

The present invention is a device for analyzing the components of by-product gas generated in the steel mill, the main body having a predetermined size of internal space, having a front cover 11 that is rotated by the opening and closing cylinder 12 to open and close one side Case 10; The pressure plate 22a is disposed in the main body case 10 and includes a pressure case 21 in which a sample tube T filled with a predetermined amount of sample gas is contained therein, and changes the internal space of the pressure case 21. A pressurizing part 20 having a cylinder 22 for raising and lowering to uniformly pressurize the sample tube T; The cylindrical casing 31 connected to the sample tube T and the piping member 39 is provided, and the foreign substance contained in the sample gas is embedded in the cylindrical casing 31 with a desiccant 30a and a filter 30b. Removing foreign matter 30 to remove; Sample gas passing through the inside of the cylindrical casing 31 is supplied and discharged, sample gas supply and discharge lines 41 and 42, carrier gas supply line 44 and gas loop chamber 43a to which carrier gas is supplied. Gas direction switching unit 40 for rotationally driving the rotating body (40b) assembled in the fixed casing (40a) so as to selectively connect the roof line (43) having a loop line 43 having a separation pipe 51 ; An analysis unit 50 for analyzing the injected sample gas together with the carrier gas injected into the separation tube 51; And a computer 61 for controlling the raising and lowering position of the pressure plate 22a, controlling the rotation position of the rotating body 40b, and comparing the detection record of the detected sample gas with the standard sample gas to calculate data. It comprises a control part 60 which has.

According to the present invention, by-products such as coke oven gas (COG) produced in the coke manufacturing process of steel mills, blast furnace gas (BFG) produced in the blast furnace process and converter gas (LDG) produced in the steelmaking process to be recycled. The effect of accurately performing gas component analysis can be obtained.

By-product gas, gas analysis, pressurized case, cylinder, sample gas, sample tube, separation tube, ion trap

Description

By-product Gas Analysis System of Steel Mill {AN APPARATUS FOR ANALYZING THE INGREDIENT OF GAS IN IRONWORKS}

1 is a block diagram showing a gas analysis device according to the prior art,

Figure 2 is a block diagram showing another gas analysis device according to the prior art,

3 is an overall configuration diagram showing a by-product gas component analysis apparatus of a steel mill according to the present invention,

Figure 4 is a perspective view showing a pressurizing unit employed in the by-product gas component analysis apparatus of the steelworks according to the present invention,

5 is a cross-sectional view showing a foreign material removal unit employed in the by-product gas component analysis apparatus of a steel mill according to the present invention;

Figure 6 is a perspective view of the gas direction switching unit employed in the by-product gas component analysis apparatus of the steelworks according to the present invention,

Figure 7 (a) (b) is a state of use of the gas direction switching unit employed in the by-product gas component analysis apparatus of a steel mill according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ...... Main body case 11 ...... Front cover

12 ...... Opening cylinder 20 ...... Pressurizing part

21 ...... Pressure case 22 ...... Cylinder                 

23a ..... Pistons 24a, 24b ... Compressed air supply and discharge line

30 ...... Foreign substance removal part 31 ...... Cylindrical casing

32 ...... plate 33 ...... plate member

40 ...... Gas direction changer 41,42 ... sample gas supply and discharge line

43 ...... roof line 43a ..... gas loop seal

44 ...... Carrier gas supply line 45 ...... Exhaust line

50 ... analysis part 50a ... separator

50b ..... Analyzer 61 ....... Computer

The present invention relates to a device for analyzing the components of by-product gas generated in steel mills, and more particularly, coke oven gas (COG) produced in the coke manufacturing process of steel mills, blast furnace gas (BFG) produced in the blast furnace process and steelmaking process The present invention relates to a by-product gas analysis device improved to accurately perform gas component analysis so as to enable the recycling of by-product gas such as converter gas (LDG).

In general, by-product gas generated in each production process of steel mills should analyze gas composition and composition to predict the amount of heat generated when reused as fuel, and mainly hydrogen (H ₂ ) and oxygen contained in by-product gas. (O ₂ ), nitrogen (N ₂ ), carbon monoxide (CO), carbon dioxide (CO ₂ ), methane (CH ₄ ), acetylene (C ₂ H ₂ ), ethylene (C ₂ H ₄ ), ethane (C ₂ Gas chromatograph system for analyzing the composition and content of H ₆ ), propylene (C ₃ H ₆ ), propane (C ₃ H ₈ ), isobutane (iC ₄ H ₁₀ ), normal butane (nC ₄ H ₁₀ ) The analysis apparatus which employ | adopted was used.

As shown in FIG. 1, the operation principle of the conventional gas chromatograph analyzing apparatus 100 includes a sample tube 110 filled with by-product gas, which is a sample gas, extending from the separator 101 at the end of the first injection pipe 111. The carrier gas tank 120, which is supplied to the separator tube 102 provided in the separator 101 and accommodates the carrier gas such as nitrogen, helium, and argon, is connected to the second injection tube 121 through the second injection tube 121. It is connected to the separation pipe 102, the hydrogen tank 130 containing hydrogen is also connected to the separation pipe 102 via the third injection pipe 131, the sample gas is a constant pressure with the carrier gas and hydrogen Excess flow rate is supplied to the separation pipe 102 is coated with a solvent material on the inner wall to pass through it.

At this time, while the sample gas passes through the separation tube 102, the component having affinity with the solvent is slow to move, on the contrary, the component having less affinity with the solvent is separated through the separation tube 103 more quickly.

In addition, each component of the sample gas separated in the separation tube passes through a detector to analyze its composition and content, wherein the sample supply amount of the sample gas injected into the separator 101 and the pressure of the sample gas must be constant at all times. Most of the data errors in the separation analysis are caused by fluctuations in supply and pressure of injected sample gas.

On the other hand, as another conventional analysis apparatus 200 for analyzing the composition and content of each component contained in the various by-product gas as described above, as shown in Figure 2, the separation of the sample gas gas in the separator 201 After the injection into the tube 202 to separate the components by the difference in affinity of the solvent in the separation tube 202, the separated sample gas is introduced into the ion trap 222 and ionized. At this time, the amount of electrons emitted is measured by the detector 230, and the measured value is compared with the measured value of the standard material to calculate data.

However, these conventional devices have the following problems.

first. Since the sample gas injected into the separators 101 and 201 cannot be adjusted to a constant supply amount and a constant pressure, a large error in data is generated when analyzing the gas component.

Second, since the solid impurities mixed in the sample gas cannot be removed before the component analysis, the use life of the expensive separation tube is shortened due to contamination of the separation pipe due to impurities, and thus unnecessary costs are required when using the equipment. .

Third, the contamination of the ion trap, which is the most important component of the analytical base, is intensified because the foreign substance in the liquid cannot be removed, which causes frequent failure of the device body. There is a problem that the service life of the device is shortened.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, the object of which is the sample gas during the component analysis operation to analyze the gas composition and composition during the reuse of by-product gas additionally produced during the steelmaking process in steel mills It is to provide a by-product gas analysis device of steel mill that can inject to the separator with a constant pressure and a certain flow rate, and remove foreign substances in the sample gas to protect the equipment, and analyze the data accurately without error.

As a technical configuration for achieving the above object, the present invention,

In the device for analyzing the components of by-product gas generated in the steel mill,

A main body case having an internal space of a predetermined size and having a front cover which is pivoted by an opening / closing cylinder to open and close one side;

A pressurizing case disposed inside the main body case and having a sample tube filled with a predetermined amount of sample gas therein, and having a cylinder for raising and lowering the pressurizing plate to change the internal space of the pressurizing case to pressurize the sample tube uniformly. part;

A foreign substance removal unit having a cylindrical casing connected through the sample tube and a pipe member, and a foreign substance contained in the sample gas by removing a foreign substance contained in the sample gas by embedding a desiccant and a filter in the cylindrical casing;

A sample gas supplied through the inside of the cylindrical casing is supplied, and a sample gas supply and discharge line discharged, and a loop line having a carrier gas supply line and a gas loop chamber supplied with the carrier gas are selectively connected to an exhaust line. A gas turning part for rotating and driving the rotating body assembled in the fixed casing to be connected;

An analyzer for analyzing the injected sample gas together with the carrier gas injected into the separation pipe; And                     

And a control unit having a computer for controlling the raising and lowering position of the pressure plate, controlling the rotation position of the rotating body, and comparing the detection record of the detected sample gas with the standard sample gas to calculate data. By providing by-product gas analysis device.

Hereinafter, the present invention will be described in more detail.

3 is an overall configuration diagram showing a by-product gas component analysis apparatus of a steel mill according to the present invention, Figure 4 is a perspective view showing a pressing unit employed in the by-product gas component analysis apparatus of a steel mill according to the present invention, Figure 5 7 is a cross-sectional view illustrating a foreign material removing unit employed in the by-product gas component analyzing apparatus of a steel mill according to the present invention, and FIG. 6 is a perspective view of a gas redirection unit employed in the by-product gas component analyzing apparatus of a steel mill according to the present invention. (b) is a state diagram of use of the gas direction switching unit employed in the by-product gas composition analyzer of the steelworks according to the present invention.

As shown in FIGS. 3 to 7, the apparatus 1 of the present invention pressurizes the sample tube containing the sample gas to a predetermined pressure, injects the sample gas into the separator at a constant supply amount, and introduces a foreign substance contained in the sample gas to be injected. As to remove, the device 1 is composed of a main body case 10, the pressurizing portion 20, the foreign material removing portion 30, the gas direction switching unit 40, the analysis unit 50 and the control unit 60. .

That is, the main body case 10 is a receiving member of a hexahedron having a predetermined internal space, the front side of the main body 11 is assembled so as to be pivotable through the hinge member (11a) on one side thereof, the main body The inner surface of the case 10 is provided with a cylinder 12 for opening and closing to open and close the front cover 11.

In addition, the pressurizing part 20 for uniformly pressurizing the sample tube T filled with a predetermined amount of sample gas includes a pressurizing case 21 disposed in the inner space of the main body case 10 and the pressurizing case 10. The cylinder 22 which raises and lowers the pressure plate 22a so that an internal space may be narrowed or widened is comprised.

The pressure case 21 is in contact with the inner surface of the front cover 11 to be opened and closed in accordance with the opening operation of the front cover 11 on one side, the pivoting operation via the hinge member 21b Attach the inner cover 21a.

In addition, the cylinder 22 for uniformly pressing the sample tube T to uniformly press the pressure plate 22a downward so that the discharge supply amount of the sample gas is constant is a piston having the pressure plate 22a attached to the rod end. An air controller 25c having a built-in 23a and a spring member 23b for elastically supporting the piston 23a upwardly and controlling the flow of compressed air compressed by the compressor tu 24 at an upper end thereof. And a compressed air supply line 24a having a supply control valve 25a for controlling the supply pressure by adjusting the air flow rate, while a discharge control valve 25b for controlling the discharge pressure by controlling the air discharge amount is connected. Compressed air discharge line (24b) having a connection configuration.

Accordingly, the compressed air generated by the compressor 24 is controlled by the supply control valve 25a via the air controller 25c to regulate the supply pressure, and then supply the compressed air into the inner space of the cylinder 22. As a result, the piston 23a can be uniformly pressurized to pressurize the pressure plate 22a mounted at the lower end of the piston 23a uniformly in the pressure case 21. In addition, the pressing force for pressurizing the piston 23a is controlled by the supply pressure and the discharge pressure regulating valves 25a and 25b installed in the compressed air supply and discharge lines 24a and 24b and the cylinder 22. When the supply of compressed air to the inside is stopped, the piston 23a is raised and returned by the elastic restoring force of the spring member 23b.

In addition, the foreign material removing unit 30 for removing the foreign matter contained in the sample gas constantly discharged from the sample tube (T) is a cylinder connected through the inlet end and the piping member 39 of the sample tube (T). A casing 31 is provided, and a desiccant 30a and a filter 30a are built in the inner space of the cylindrical casing 31 so as to remove foreign substances contained in the sample gas discharged through the sample gas supply line 41 by passing through the casing 31. do.

The cylindrical casing 31 has a front mixing 35a in which the desiccant 30a and the filter 30b are built, and a gas mixing path is smoothly made while the discharge path of the sample gas passing through the front casing 35a is lengthened. A plurality of plate members 33 are disposed on the boundary between the rear casing 35b mounted vertically to the inner wall and the front and rear casings 35a and 35b, and the partition walls through which the plurality of holes 32a are formed. 32).

Accordingly, the sample gas from which foreign matter is removed while passing through the desiccant 300a and the filter 30b in the front casing 35a passes through the hole 32a of the partition wall 32 and the plate of the rear casing 35b. The discharge passage is lengthened by the member 33 and mixed smoothly with each other, and then discharged to the sample gas supply line 41.

In addition, the gas switching unit 40 for easily transferring the supply path of the sample gas and the supply path of the carrier gas is assembled to the fixed casing (40a) of the hollow-cylindrical cylinder and rotatably therein so as to rotate the inside of the motor member (40c). It consists of a rotating body 40b that is rotated by a drive source, the sample gas supply line 41 is supplied to the outer surface of the fixed casing (40a) and the sample gas from which the foreign matter is removed while passing through the inside of the cylindrical casing (31) The outlet end of the is connected, the inlet end of the sample gas discharge line 42 for discharging the sample gas to the outside is connected.

Then, the carrier gas is supplied by extending from the inlet and the outlet end of the roof line 43 having the gas loop chamber 43a in which the sample gas is temporarily stored in the middle of the length, and from the carrier gas tank 49 in which a certain amount of the carrier gas is received. The outlet end of the carrier gas supply line 44 is also connected to the outer surface of the fixed casing 40a, while the inlet end of the exhaust line 45 is connected to the outlet pipe 51 of the separator 50a. The fixed casing 40a is connected to the outer surface.

In addition, the rotatable body 40b rotatably assembled in the inner space of the fixed casing 40a has an outlet end of the sample gas supply line 41 and an inlet end of the roof line 43 connected to the body. The outlet end of the roof line 43 and the inlet end of the sample gas discharge line 43 are connected to each other, while the outlet end of the carrier gas supply line 44 and the inlet end of the exhaust line 45 are connected to each other. Filling the gas loop chamber (43a) of the roof line 43, the standby mode for supplying only the carrier gas to the separation pipe 51, the outlet end of the sample gas supply line 41 and the sample gas discharge line 42 Inlet ends are connected to each other, and both ends of the inlet and outlet of the roof line 43 are connected to the inlet end of the carrier gas supply line 44 and the inlet end of the exhaust line 45 to discharge the sample gas to the outside. The carrier gas is divided together with the sample gas filled in the gas loop chamber 43a. The first, second, and third connection passages 46a, 46b, 46c are formed in an arc shape so as to be able to switch to the analysis mode supplied to the conduit 51.

Accordingly, in the forward view of the rotating body 40b by the driving source of the motor member 40c, the motor is turned to the analysis mode after stopping by 120 ° in the counterclockwise direction, and in the reverse direction, when the motor is stopped by 120 ° in the clockwise direction. It will form a standby mode.

In addition, the analysis unit 50 may separate the separation tube 51 through which the sample gas and the carrier gas are supplied through the exhaust line 45 to analyze the components of the sample gas injected together with the carrier gas into the separation tube 51. And a detector 50b incorporating a separator 50a having a separator, a filament 52 for emitting hot electrons for ionizing the sample gas, and an ion trap 53 for detecting ion electrons generated from the ions of the sample gas.

On the other hand, the control unit 60 of the air controller 25c, the supply pressure control valve 25a and the compressed air discharge line 24b of the compressed air supply line 24a to control the lifting position of the pressure plate (22a). Adjusting the discharge pressure regulating valve 25b, controlling the drive of the motor member 40c to switch the rotational position of the rotating body 40b in the forward and reverse directions by 120 °, and detected by the detector 50b A computer 61 for calculating data by comparing the detection record of the sample gas with the detection record of the standard sample gas is provided.

The computer 61 controls the entire apparatus and calculates the concentration from the detected amount of electrons, the detector 50a, the air conditioner controller 25c, the supply pressure regulating valve 25a, the discharge pressure regulating valve 25b, and the motor member. 40c, the ion trap 53 is electrically connected.

The operation of the present invention having the above configuration will be described.

Analyzing the components of by-product gas generated in the steel mill using the apparatus (1) of the present invention, first, a sample tube (volume-expanded when gas injection of a sample gas collected from the by-product gas produced in the iron making process) Collect a certain amount in T).

In addition, the sample tube (T) is the inside of the pressing case 21 through one side of the pressing case 21 in which the inner cover 21a is opened at the same time when the front cover 11 of the main body case 10 is opened. Is disposed in the space, the inlet of the sample tube (T) is drawn out to the outside of the pressure case () 21, the piping member 39 is connected to one end of the lower end of the cylindrical casing 31 of the foreign material removing unit 30 It is fitted to the other end of). At this time, the pressure plate 22a disposed on the upper portion of the sample tube part T is raised to the maximum and disposed in the pressure case 21.

In this state, the front cover 11 of the main body case 10 and the inner cover 21a of the pressure case 21 are simultaneously closed by the backward return operation of the opening and closing cylinder 12.

Subsequently, when the control unit 600 inputs the injection pressure for injecting the sample gas and starts the apparatus, the air is compressed by the operation of the compressor 24, and the compressed air is supplied through the compressed air supply line 24a. By being supplied into the cylinder 22, a pressure of a constant strength is formed in the inner space.

At this time, the start of the compressor 24 is controlled by the air conditioner controller 25c of the compressed air supply line 24a and the supply pressure regulating valve 25a and the discharge pressure are adjusted at the same time. The opening degree of the valve 25b is adjusted to maintain a constant pressure in the cylinder 22.

When the pressure inside the cylinder 22 is kept constant such that a pressure greater than the elastic restoring force of the spring member 22 accommodated in the cylinder 22 is maintained, the piston 23a is lowered and the pressure plate 22a is lowered. ) Will continue to press the sample tube (T) at a constant pressure.

In this case, the sample gas in the collection tube (T) is supplied into the cylindrical casing 31 of the debris removal unit 30 through the piping member 39 while passing through the desiccant 30a accommodated in the front casing 35a. Is removed, and impurities are continuously removed while passing through the filter 30b, and then supplied into the rear casing 35b through the holes 32a of the partition 32.

In addition, the sample gas supply line 41 mounted at the end of the cylindrical casing 31 has a long discharge path and smooth gas mixing by the plate member 33 installed in the rear casing 35b. It is supplied to the gas direction switching unit 40 through.

On the other hand, in the standby mode by the standby command of the computer 61, the gas direction switching unit 40, as shown in Figure 7 (a), the gas loop chamber 43a of the roof line 43 And the remaining sample gas is discharged to the outside, the carrier gas is connected to the outlet end of the sample gas supply line 41 and the inlet end of the roof line 43 to form a standby mode for supplying to the separation pipe 51. The carrier gas is connected to each other through a passage 46a, and the outlet end of the roof line 43 and the inlet end of the sample gas discharge line 42 are connected to each other via a second connection passage 46b and at the same time. The outlet end of the supply line 44 and the inlet end of the exhaust line 45 are connected to each other via the third connecting passage 46c.

In this state, when the analysis command is issued by the computer 61 of the control unit 60, the power is applied to the motor member 40c, and the rotating body 40b assembled in the fixed casing 40a so as to be capable of divided rotation by 120 ° is forwarded. In the drawing, rotate counterclockwise to switch from standby mode to analysis mode.

Accordingly, the outlet end of the sample gas supply line 41 and the inlet end of the sample gas discharge line 42 are connected to each other via the first connection passage 46a, and both ends of the inlet and outlet of the roof line 43 are connected to each other. Samples supplied from the foreign matter removing unit are connected to the inlet end of the carrier gas supply line 44 and the inlet end of the exhaust line 45 via the second and third connection passages 46b and 46c, respectively. While the gas is discharged to the outside, the sample gas filled in the gas loop chamber 43a is injected into the separation pipe 51 together with the carrier gas at a constant pressure and a constant supply flow rate.

Subsequently, the sample gas injected into the separation tube 51 is separated and discharged for each component according to the affinity with the solvent applied to the inner wall and flows into the ion trap 53 of the detector 50b. In reference numeral 53, the ions of the sample gas collide at right angles with the hot electrons emitted from the filament 52 to emit ionic electrons, and these electrons are detected by the detector 50b. The detected signal is transmitted to the computer 61 and calculated as data in comparison with the detection record of the standard sample gas.

 According to the present invention as described above, since the sample tube filled with the sample gas is pressurized at a constant pressure to be injected into the separation tube at a constant flow rate, and the injection amount of the sample gas can be precisely controlled, the accuracy of component analysis of the sample gas is conventionally increased. Compared with this, it is possible to improve remarkably and to remove the water and impurities contained in the sample gas just before injection into the separator, thereby preventing the damage of expensive separator tube and ion trap and extending its service life. Obtained.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (6)

In the device for analyzing the components of by-product gas generated in the steel mill, A main body case having an internal space of a predetermined size and having a front cover 11 which is pivoted by an opening / closing cylinder 12 to open and close one side thereof; The pressure plate 22a is disposed in the main body case 10 and includes a pressure case 21 in which a sample tube T filled with a predetermined amount of sample gas is contained therein, and changes the internal space of the pressure case 21. A pressurizing part 20 having a cylinder 22 for raising and lowering to uniformly pressurize the sample tube T; The cylindrical casing 31 connected to the sample tube T and the piping member 39 is provided, and the foreign substance contained in the sample gas is embedded in the cylindrical casing 31 with a desiccant 30a and a filter 30b. Removing foreign matter 30 to remove; Sample gas passing through the inside of the cylindrical casing 31 is supplied and discharged, sample gas supply and discharge lines 41 and 42, carrier gas supply line 44 and gas loop chamber 43a to which carrier gas is supplied. Gas direction switching unit 40 for rotationally driving the rotating body (40b) assembled in the fixed casing (40a) so as to selectively connect the roof line (43) having a loop line 43 having a separation pipe 51 ; An analysis unit 50 for analyzing the injected sample gas together with the carrier gas injected into the separation tube 51; And And a computer 61 for controlling the raising and lowering position of the pressure plate 22a, controlling the rotation position of the rotating body 40b, and comparing the detection record of the detected sample gas with the standard sample gas to calculate the data. By-product gas component analysis apparatus of a steel mill, characterized in that it comprises a control unit (60). The method of claim 1, The pressure case 21 is in contact with the inner surface of the front cover 11 to be opened and closed in accordance with the opening operation of the front cover 11 on one side, the pivoting operation via the hinge member 21b By-product gas analysis device of a steel mill, characterized in that the inner cover (21a) is mounted. The method of claim 1, The cylinder 22 has a built-in piston 23a for mounting the pressure plate 22a at the rod end, a spring member 23b for resiliently supporting the piston 23a upward, and a compressor at the upper end thereof. 24 is connected to a compressed air supply line 24a having an air controller 25c for controlling the flow of compressed air compressed at 24) and a supply control valve 25a for controlling the supply pressure by adjusting the air flow rate. By-product gas analysis device of the steel mill, characterized in that the compressed air discharge line (24b) having a discharge control valve (25b) for controlling the discharge pressure to control the discharge pressure. The method of claim 1, The cylindrical casing 31 has a front mixing 35a in which the desiccant 30a and the filter 30b are built, and a gas mixing path is smoothly made while the discharge path of the sample gas passing through the front casing 35a is lengthened. A plurality of plate members 33 are disposed on the boundary between the rear casing 35b mounted vertically to the inner wall and the front and rear casings 35a and 35b, and the plurality of holes 32a are formed therethrough. By-product gas analysis device of the steel mill, characterized in that consisting of (32). The method of claim 1, The rotor 40b is connected to the outlet end of the sample gas supply line 41 and the inlet end of the roof line 43 to the body, and the outlet end of the roof line 43 and the sample gas discharge line 43 are connected to each other. While the inlet ends are connected to each other, the outlet end of the carrier gas supply line 44 and the inlet end of the exhaust line 45 are connected to each other to fill the gas loop chamber 43a of the roof line 43, Standby mode for supplying only the carrier gas to the separation pipe 51, the outlet end of the sample gas supply line 41 and the inlet end of the sample gas discharge line 42 is connected to each other, the exit of the roof line 43, Both ends of the inlet are connected to the inlet end of the carrier gas supply line 44 and the inlet end of the exhaust line 45, respectively, to discharge the sample gas to the outside, and the carrier gas together with the sample gas filled in the roof chamber. 51) and 1, 2, and 2 to switch to the analysis mode supplied to 3 by-product gas analysis device of the steel mill, characterized in that the connecting passage (46a) (46b) (46c) is formed in an arc shape. The method of claim 1, The analyzer 50 includes a separator 50a having a separator tube 51 through which a sample gas is supplied through an exhaust line 45 together with a carrier gas, and a filament 52 for emitting hot electrons for ionizing the sample gas. And a detector (50b) incorporating an ion trap (53) for detecting ion electrons generated from ions of the sample gas.

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