A mixed gas preparation device and gas production system

Abstract

This utility model discloses a mixed gas preparation device and gas generation system. The mixed gas preparation device includes a mixing tank, a baffle, and a flow guiding structure. The mixing tank has an interconnected feed chamber, a mixing chamber, and a discharge chamber. The mixing tank is provided with a gas outlet communicating with the discharge chamber, and a pressurized liquid inlet and a pressurized gas inlet communicating with the feed chamber. The baffle is disposed in the mixing chamber, and has multiple circumferentially spaced guide channels on the side of the baffle near the feed chamber, extending from the center of the baffle to the outer edge. The flow guiding structure is disposed between the inner wall of the mixing tank and the baffle, extending in a curved shape along the inner wall of the mixing tank and penetrating the baffle. Through the synergistic effect of the baffle and the flow guiding structure, the guide channels on the baffle cause the gas to be diverted and evenly distributed, effectively solving the problem of poor separation effect caused by liquid accumulation in traditional gas-liquid separation devices.

Description

Technical Field

[0001] This utility model relates to the field of light hydrocarbon fuel preparation technology, specifically to a mixed gas preparation device and gas production system. Background Technology

[0002] With the increasing demand for energy and the ever-increasing environmental protection requirements, light hydrocarbon fuel gas has received widespread attention as a clean and efficient alternative energy source. Light hydrocarbon fuel gas is typically prepared by mixing liquid light hydrocarbons (such as pentane and hexane) with air or other gases. The preparation process requires ensuring thorough mixing of the gas and liquid to improve the stability and combustion efficiency of the fuel gas.

[0003] Currently, there are various light hydrocarbon gas generating devices. For example, CN105402758A discloses a light hydrocarbon gas generating device, which includes a liquid light hydrocarbon storage tank, a high-pressure air storage tank, a vaporization tank, a liquid delivery pipe, and a gas delivery pipe. The liquid light hydrocarbon storage tank supplies liquid light hydrocarbons to the vaporization tank through the liquid delivery pipe, the high-pressure air storage tank supplies high-pressure air to the vaporization tank through the gas delivery pipe, a heating device heats the liquid light hydrocarbons, and finally vaporizes the liquid light hydrocarbons into gas. When the gas is discharged, a gas-liquid separation device can remove the liquid phase substances mixed in with the gas.

[0004] However, when traditional gas-liquid separation devices use baffle-type gas-liquid separators to separate liquid substances mixed in with fuel gas, the internal structure of the gas-liquid separator can easily cause the separated liquid to accumulate in specific areas, forming liquid films or droplet build-ups, which can affect the separation efficiency of subsequent liquid substances. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a mixed gas preparation device and gas production system to solve the technical problems of insufficient gas-liquid mixing and low separation efficiency in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, this utility model provides a mixed gas preparation device, comprising: a mixing tank, a baffle, and a flow guiding structure. The mixing tank has a feed chamber, a mixing chamber, and a discharge chamber that are interconnected. The mixing tank is provided with a gas outlet communicating with the discharge chamber, and a pressurized liquid inlet and a pressurized gas inlet communicating with the feed chamber. The baffle is disposed in the mixing chamber, and the baffle is provided with a plurality of circumferentially spaced guide channels on the side of the baffle near the feed chamber. The guide channels extend from the center of the baffle to the outer edge. The flow guiding structure is disposed between the inner wall of the mixing tank and the baffle, and the flow guiding structure extends in a curved shape along the inner wall of the mixing tank and penetrates the baffle.

[0008] In some embodiments, the flow guiding structure includes a plurality of flow guiding channels disposed on the inner wall of the mixing tank, and each of the flow guiding channels corresponds to the flow guiding path of at least one of the flow guiding channels.

[0009] In some embodiments, the guide channel is a spiral channel or a wavy channel.

[0010] In some embodiments, the baffle includes a baffle and a plurality of flow dividers. The baffle is connected to the inner wall of the mixing tank and covers the cross-sectional area of ​​the mixing tank. The plurality of flow dividers are all located on the side of the baffle near the feed chamber and are evenly arranged around the center line of the flow divider. The guide channel is formed between two adjacent flow dividers.

[0011] In some embodiments, the manifold has a curved structure, and the guide channel formed between two adjacent manifolds is spiral-shaped.

[0012] In some embodiments, the flow path of the flow guiding structure corresponds to the outer edge of the end of the flow divider.

[0013] In some embodiments, the mixed gas preparation device further includes an atomizing structure disposed within the feed chamber and connected to the pressurized liquid inlet, wherein the exhaust port of the pressurized gas inlet corresponds to the spray area of ​​the atomizing structure.

[0014] In some embodiments, the mixed gas preparation apparatus further includes a flow splitting structure connected to the pressurized gas inlet and having multiple gas outlets arranged around the spray area and each corresponding to the spray area.

[0015] In some embodiments, the gas outlet jet direction of the diversion structure forms an angle of 10°-45° with the radial direction of the mixing tank, and each of the gas outlets is circumferentially and uniformly distributed around the central axis of the mixing tank.

[0016] Secondly, this utility model also provides a gas production system, including a mixed gas preparation device as described in any one of the above.

[0017] Compared with existing technologies, the mixed gas preparation device and gas generation system provided by this utility model, through the setting of a mixing tank, baffles, and a flow guiding structure, allows the baffles to cooperate with the inner wall of the mixing tank to form a multi-stage impact separation mechanism. Simultaneously, the gas is diverted through the guide channel, which facilitates the mixing of the medium and the separation of the liquid medium, achieving efficient separation and thorough mixing of the gas-liquid mixture and ensuring the uniformity and stability of the mixed medium in the discharge chamber. The curved extension design of the flow guiding structure optimizes the gas flow path, causing droplets to flow back along the inner wall and fully vaporize, significantly improving mixing efficiency and avoiding resource waste. This effectively solves the problem of poor separation effect caused by liquid accumulation in traditional gas-liquid separation devices. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the mixed gas preparation device provided in this embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the main cross-sectional structure of the mixed gas preparation device provided in this embodiment of the utility model;

[0020] Figure 3 This is a bottom view structural diagram of the partition component installation of the mixed gas preparation device provided in this embodiment of the present invention;

[0021] Figure 4 This is a three-dimensional structural schematic diagram of the partition component of the mixed gas preparation device provided in this embodiment of the utility model;

[0022] Figure 5 This is a schematic diagram of the flow splitting structure of the mixed gas preparation device provided in this embodiment of the utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Mixing tank; 11. Feed chamber; 12. Mixing chamber; 13. Discharge chamber; 14. Gas outlet; 15. Pressurized liquid inlet; 16. Pressurized gas inlet;

[0025] 2. Partition; 21. Baffle; 22. Diverter plate; 23. Guide channel;

[0026] 3. Flow guiding structure; 31. Flow guiding channel;

[0027] 4. Atomizing structure; 41. First pipe;

[0028] 5. Diversion structure; 51. Ring pipe; 52. Exhaust pipe;

[0029] 6. Circulation structure; 61. Circulation pump; 62. Discharge pipe; 63. Inlet pipe; 64. Second pipe; 65. Check valve; 66. Drain pipe; 67. Valve. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] To address the technical problems of insufficient gas-liquid mixing and low separation efficiency, this invention provides a mixing gas preparation device and gas generation system. Through the synergistic effect of a baffle and a flow guiding structure, the guiding channels on the baffle cause gas to be diverted and evenly distributed. Simultaneously, by extending the droplet flow path, secondary gasification of light hydrocarbon components in the droplets is promoted, avoiding resource waste. This effectively solves the problem of poor separation performance caused by liquid accumulation in traditional gas-liquid separation devices.

[0032] Please see Figures 1 to 3 In a first aspect, embodiments of this application provide a mixed gas preparation device, comprising: a mixing tank 1, a baffle 2, and a flow guiding structure 3. The mixing tank 1 has a feed chamber 11, a mixing chamber 12, and a discharge chamber 13 that are interconnected. The mixing tank 1 is provided with a gas outlet 14 communicating with the discharge chamber 13, and a pressurized liquid inlet 15 and a pressurized gas inlet 16 communicating with the feed chamber 11. The baffle 2 is disposed in the mixing chamber 12. The baffle 2 is provided with a plurality of circumferentially spaced guide channels 23 on the side near the feed chamber 11. The guide channels 23 extend from the center of the baffle 2 toward the outer edge. The flow guiding structure 3 is disposed between the inner wall of the mixing tank 1 and the baffle 2. The flow guiding structure 3 extends in a curved shape along the inner wall of the mixing tank 1 and penetrates the baffle 2.

[0033] In this device, liquid light hydrocarbons and air enter the feed chamber 11 of the mixing tank 1 through the pressurized liquid inlet 15 and the pressurized gas inlet 16, respectively. After being heated and vaporized, the pressurized liquid enters the mixing chamber 12 and the discharge chamber 13 sequentially with the air. When the mixed medium passes through the mixing chamber 12, it impacts the baffle 2, causing some droplets to accumulate on the baffle 2. The gas can be diverted on one side of the baffle 2 by the guiding effect of the guide channel 23 and flow outward from the baffle 2, promoting the uniform distribution of the mixed medium in the mixing chamber 12. At the same time, the gas impacts the inner wall of the mixing tank 1 under the guidance of the guide channel 23, further separating the gas and droplets. The gas flows to the discharge chamber 13 through the guide structure 3, while the droplets flow back to the feed chamber 11 along the guide structure 3. Under the guidance of the guide structure 3, the droplets flow along the curved path of the inner wall of the mixing tank 1, allowing the light hydrocarbon components in the droplets to be further vaporized during the flow process and mixed more thoroughly with the air.

[0034] To improve separation efficiency and the gasification of light hydrocarbon components in the droplets, please refer to [link / reference needed]. Figure 2 and Figure 3 In some possible embodiments, the flow guiding structure 3 includes several flow guiding channels 31, which are disposed on the inner wall of the mixing tank 1. Each guide channel 23 corresponds to the flow guiding path of at least one or more flow guiding channels 31. The mixed gas guided by the flow guiding channels can smoothly enter the discharge chamber 13 through the flow guiding channels 31, while the droplets flow back to the feed chamber 11 along a curved path under the guidance of the flow guiding channels 31. The flow guiding channels 31 are spiral channels or wavy channels, etc., which can extend the flow path. This arrangement effectively slows down the flow velocity of the droplets, further promotes the gasification of light hydrocarbon components, and improves the overall mixing efficiency.

[0035] Please see Figures 2 to 4 In some possible embodiments, the baffle 2 includes a baffle 21 and several diverter plates 22. The baffle 21 has an annular structure and its outer side is sealed to the inner wall of the mixing tank 1, covering the cross-sectional area of ​​the mixing tank 1. Several diverter plates 22 are located on the side of the baffle 21 near the feed chamber 11 and are evenly arranged in an annular array around the center line of the diverter plate 22. A guide channel 23 is formed between two adjacent diverter plates 22. After the mixing medium hits the diverter plate 22, it will be dispersed by the diverter plate 22 and the flow direction will be changed, so that the mixing medium can be more evenly distributed in the mixing chamber 12. Then the mixing medium flows to the outside and hits the inner wall of the mixing tank 1. The gas part in the mixing medium can flow smoothly through the guide groove 31 to the upper layer, and the droplets will be retained in the guide groove 31 and flow back to the feed chamber 11 along the curved path of the guide groove 31.

[0036] To further improve gas-liquid separation performance, please refer to [link / reference]. Figure 3 and Figure 4 In one embodiment, the flow divider 22 adopts a curved design, and the guide channel 23 formed between two adjacent flow dividers 22 is arranged in a spiral shape. This allows the droplets to be subjected to centrifugal force within the spiral guide channel 23, making them easier to be thrown towards the inner wall of the mixing tank 1, and then flow back to the feed chamber 11 along the curved path under the guidance of the flow guide structure 3. The channel body of the flow guide groove 31 corresponds to the outer edge of the end of the flow divider 22 to further improve the flow efficiency and vaporization effect of the droplets within the flow guide groove 31.

[0037] Of course, in other possible embodiments, the flow guiding structure 3 and the baffle 2 can also adopt other structural forms. For example, the flow guiding structure 3 can be composed of multiple curved guide plates, which form a tortuous flow path between the inner wall of the mixing tank 1 and the baffle 2. The baffle 2 can also be designed as a porous structure with a complex shape to increase the contact area between the mixing medium and the baffle 2, thereby further improving the mixing efficiency and gas-liquid separation effect. In addition, a heating element can be installed inside the mixing tank 1 to heat the mixing medium, promote the gasification of liquid light hydrocarbons, and improve the uniformity and combustion efficiency of the mixed gas.

[0038] Please see Figure 2 In some possible embodiments, multiple sets of baffles 2 are provided. Each set of baffles 2 includes a baffle 21 and several diverting plates 22. The multiple sets of baffles 2 are arranged sequentially in the mixing chamber 12 from the direction closest to the feed chamber 11 to the direction furthest away, and are arranged sequentially along the height direction. The spacing between each set of baffles 2 may be equal or unequal. This arrangement allows the mixing medium to be guided multiple times by the guide channel 23 and the guide structure 3 when flowing through the multiple sets of baffles 2, further improving the gas-liquid separation efficiency and the gasification effect of light hydrocarbon components. At the same time, the arrangement of multiple sets of baffles 2 also increases the residence time of the mixing medium in the mixing chamber 12, allowing the mixing medium to be mixed and react more fully.

[0039] To improve the mixing efficiency of liquid light hydrocarbons with air, please refer to [link / reference needed]. Figure 2 and Figure 5 In some possible embodiments, the mixed gas preparation device further includes an atomizing structure 4 and a diversion structure 5. The atomizing structure 4 is preferably an atomizing nozzle, which is disposed in the feed chamber 11 and connected to the pressurized liquid inlet 15 through a first pipe 41. It is used to atomize liquid light hydrocarbons into fine droplets so that the liquid light hydrocarbons can be better mixed with air. The diversion structure 5 is disposed in the mixing tank 1 and is located downstream of the atomizing structure 4. The diversion structure 5 is connected to the pressurized gas inlet 16 and has multiple gas outlets. The multiple gas outlets are arranged around the spray area and correspond to the spray area so as to uniformly disperse air into the atomized liquid light hydrocarbons, thereby enhancing the mixing uniformity of the liquid light hydrocarbons and air.

[0040] Further, please refer to Figure 2 and Figure 5 In some possible embodiments, the gas outlets are circumferentially uniformly distributed around the central axis of the mixing tank 1, ensuring that the gas is evenly distributed and mixed within the tank. The jet direction of the gas outlets is not directly radial, but forms a certain angle with the radial direction of the mixing tank 1. Specifically, the flow splitting structure 5 includes an annular pipe 51 and outlet pipes 52. The annular pipe 51 is installed inside the mixing tank and is connected to the pressurized gas inlet 16. The outlet pipes 52 are all connected to the inner side of the annular pipe 51 and are distributed in an array. The angle formed with the radial direction of the mixing tank 1 is between 10° and 45°. The outlet pipes 52 cooperate with each other to make the ejected air swirl, further promoting the mixing of liquid light hydrocarbons and air, so that the mixed medium has already achieved a high degree of uniformity before entering the mixing chamber 12.

[0041] To further separate the gaseous components from the liquid medium and improve the overall operating efficiency of the device, please refer to [link / reference needed]. Figure 1 and Figure 2In some possible embodiments, the mixed gas preparation device further includes a circulation structure 6, which includes a circulation pump 61, an outlet pipe 62, and an inlet pipe 63. The circulation pump 61 is located outside the mixing tank 1. One end of the outlet pipe 62 is connected to the output end of the circulation pump 61, and the other end extends into the mixing tank 1 and is connected to the feed chamber 11 at the bottom of the mixing tank 1, so as to pump the liquid medium that has returned to the feed chamber 11 back to the circulation pump 61. One end of the inlet pipe 63 is connected to the input end of the circulation pump 61, and the other end is connected to the atomizing structure 4 through a second pipe 64, so as to deliver the liquid medium pressurized by the circulation pump 61 back to the atomizing structure 4 for atomization. Through such a circulation structure 6, the liquid medium can circulate multiple times inside the device. Each circulation can further promote the gasification of liquid light hydrocarbons and their mixing with air, thereby improving the overall operating efficiency of the device and the separation effect of gas components.

[0042] Furthermore, both the first pipe 41 and the second pipe 64 are equipped with check valves 65 to ensure that the liquid medium flows only in a predetermined direction during circulation, thus avoiding mutual interference between the circulation structure 6 and the liquid light hydrocarbon supply system. When using the circulation structure 6, the pressurized liquid inlet 15 should be closed to ensure that the liquid medium can be processed through the circulation structure 6.

[0043] Furthermore, in some possible embodiments, a drain pipe 66 is also provided on the outlet pipe 62, and a valve 67 is installed on the drain pipe 66. When it is necessary to discharge the residual liquid medium in the mixing tank 1, the residual liquid medium can be discharged through the drain pipe 66 by opening the valve 67.

[0044] Secondly, embodiments of this application also provide a gas production system, including a mixed gas preparation device as described in any of the above embodiments. The gas production system further includes a liquid light hydrocarbon storage tank, an air compressor, a heating device, and a control system. The liquid light hydrocarbon storage tank is used to store liquid light hydrocarbons and is connected to the pressure liquid inlet 15 of the mixed gas preparation device via a pipeline to supply liquid light hydrocarbons to the device. The air compressor is used to compress outside air and is connected to the pressure gas inlet 16 of the mixed gas preparation device via a pipeline to supply compressed air to the device. The heating device is located outside or inside the mixing tank 1 of the mixed gas preparation device and is used to heat the mixing medium inside the mixing tank 1 to promote the vaporization of the liquid light hydrocarbons. The control system is used to control the operation of the entire gas production system, including the supply of liquid light hydrocarbons, air compression, the start and stop of the heating device, and the operating status of the mixed gas preparation device.

[0045] To better understand this utility model, the following is combined with... Figures 1 to 5The technical solution of this utility model is described in detail below: During operation, liquid light hydrocarbons enter the feed chamber 11 through the pressurized liquid inlet 15, are atomized by the atomizing structure 4 to form fine droplets, and then vaporize after heating. Simultaneously, air enters the mixing tank 1 through the pressurized gas inlet 16 and is evenly dispersed into the atomized liquid light hydrocarbons under the action of the diversion structure 5. After initial mixing of the liquid light hydrocarbons and air in the feed chamber 11, they enter the mixing chamber 12. In the mixing chamber 12, the mixing medium first impacts the baffle 21, and some droplets accumulate on the baffle 21, while the gas is diverted under the guidance of the guide channel 23 and flows outwards towards the baffle 2. During this process, the mixing medium achieves initial uniform distribution. Subsequently, the gas continues to flow and impacts the inner wall of the mixing tank 1, further separating the gas and droplets. Guided by the guide structure 3, the gas flows upwards through the guide groove 31 and enters the discharge chamber 13 after passing through multiple baffles, while the droplets flow back to the feed chamber 11 along the curved path of the guide groove 31. As the droplets flow back to the feed chamber 11, they move along a curved path along the inner wall of the mixing tank 1, where the light hydrocarbon components can be further vaporized. The vaporized light hydrocarbons then mix with the air again, forming a more homogeneous mixture.

[0046] This invention, through the design of a mixing tank 1, a baffle 2, and a flow guiding structure 3, establishes a multi-stage impact separation mechanism by cooperating with the inner wall of the mixing tank 1. Simultaneously, the flow guiding channel 23 diverts gas flow, promoting medium mixing and liquid medium separation, thus achieving efficient separation and thorough mixing of the gas-liquid mixture and ensuring the uniformity and stability of the mixed medium in the discharge chamber 13. The curved extension design of the flow guiding structure 3 optimizes the gas flow path, allowing droplets to flow back along the inner wall and fully vaporize, significantly improving mixing efficiency and avoiding resource waste. This effectively solves the problem of poor separation effect caused by liquid accumulation in traditional gas-liquid separation devices.

[0047] This device not only improves mixing efficiency but also ensures the uniformity and stability of the mixed medium in the discharge chamber 13. Furthermore, the curved extension design of the guide structure 3 optimizes the gas flow path and reduces energy loss during mixing, making the entire device more efficient and energy-saving.

[0048] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0049] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A hybrid gas generation apparatus, characterized by, include: The mixing tank has an internally connected feed chamber, a mixing chamber, and a discharge chamber. The mixing tank is provided with an air outlet connected to the discharge chamber, and a pressurized liquid inlet and a pressurized gas inlet connected to the feed chamber. A baffle is disposed within the mixing chamber. The baffle, on its side near the feeding chamber, has multiple circumferentially spaced guide channels extending from the center of the baffle outwards. A flow guiding structure is disposed between the inner wall of the mixing tank and the partition, the flow guiding structure extending in a curved shape along the inner wall of the mixing tank and penetrating the partition.

2. The hybrid gas generation device of claim 1, wherein, The flow guiding structure includes a plurality of flow guiding channels, which are disposed on the inner wall of the mixing tank, and each of the flow guiding channels corresponds to the flow guiding path of at least one of the flow guiding channels.

3. The hybrid gas generation plant of claim 2, wherein, The guide channel is a spiral channel or a wavy channel.

4. The hybrid gas generation plant of claim 1, wherein, The baffle includes a baffle and several flow dividers. The baffle is connected to the inner wall of the mixing tank and covers the cross-sectional area of ​​the mixing tank. The flow dividers are all located on the side of the baffle near the feed chamber and are evenly arranged around the center line of the flow dividers. The guide channel is formed between two adjacent flow dividers.

5. The hybrid gas generation plant of claim 4, wherein, The flow divider plate has a curved structure, and the guide channel formed between two adjacent flow dividers plate is spiral-shaped.

6. The hybrid gas generation plant of claim 5, wherein, The flow path of the flow guiding structure corresponds to the outer edge of the end of the flow divider plate.

7. The hybrid gas generation plant of claim 1, wherein, The mixed gas preparation device further includes an atomizing structure, which is disposed in the feed chamber and connected to the pressurized liquid inlet. The exhaust port of the pressurized gas inlet corresponds to the spray area of ​​the atomizing structure.

8. The mixed gas preparation apparatus according to claim 7, characterized in that, The mixed gas preparation device further includes a flow splitting structure, which is connected to the pressurized gas inlet and has multiple gas outlets. The multiple gas outlets are arranged around the spray area and each corresponds to the spray area.

9. The mixed gas preparation apparatus according to claim 8, characterized in that, The gas outlet jet direction of the diversion structure forms an angle of 10°-45° with the radial direction of the mixing tank, and each of the gas outlets is circumferentially and evenly distributed around the central axis of the mixing tank.

10. A gas production system, characterized in that, Includes the mixed gas preparation apparatus as described in any one of claims 1-9.

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