Device and method for mixing gases

Abstract

The invention relates to a device for mixing gases, comprising: a main pipe (1) into which a plurality of parallel plates (2) are introduced, which extend from one pipe wall of the main pipe (1) to the opposite pipe wall and are oriented such that their flat sides (3) are parallel to the longitudinal direction of the main pipe (1); and a distribution duct (4), outside of the main duct (1), from which a plurality of supply lines (4a) are branched, where each supply line (4a) opens into the plate (2) and is connected in the plate (2) to a plurality of channels (5), which channels are connected to the main duct (1) via outlet openings (6), where the outlet openings (6) are mounted at the end face of the plate (2) facing away from the gas flow as the gas flows through the main duct (1). The invention also relates to a method for mixing gases in which, in the device according to the invention, a first gas is conducted through the main pipe (1) and a second gas is introduced into the distribution pipe (4) and conveyed through the plate (2) via the supply line (4a) and the channel (5) and into the main pipe (1) via the plurality of outlet openings (6).

Description

[0001] The present invention relates to a device and a method for mixing gases, in particular for mixing reactive gases, for example for mixing oxygen with gaseous hydrocarbons.

[0002] When mixing gases, the purpose is to achieve a uniform gas mixture in the most efficient way possible. For example, a uniform mixture should be obtained in a short mixing length and / or a small mixing volume. This is particularly relevant when a reactive gas such as an oxygen-containing gas or even pure oxygen is mixed with, for example, a hydrocarbon-containing gas, because the above-mentioned mixing can lead to the formation of a flammable gas volume (ignitable gas volume), for example, when the oxygen content is ≥8% by volume, mixed with ethylene, which is problematic from a safety point of view. Even when producing a gas mixture with an oxygen content lower than the flammable gas volume, when pure or high-concentration oxygen is introduced into, for example, a hydrocarbon-containing gas during mixing, it is inevitable to enter the flammable range because a local oxygen concentration higher than the ignition threshold occurs in the mixing region. Ignition occurs when an ignition source (ignition source, ignition source) is present in addition to the flammable gas volume. Therefore, when handling a flammable gas volume, the ignition source must be eliminated. An ignition source with sufficient ignition energy can be only, for example, particles carried in the gas stream and impacting the pipe wall with appropriate pulses.

[0003] In conventional processes, oxygen or oxygen-containing gas is usually injected into the edge in the form of a point or distributed on the periphery of the mainstream of hydrocarbon gas flow. However, in such an operation, the formation of combustible gas volume is acute. In order to solve this problem, for example, EP1726355A2 and WO2009078899A1 suggest supplying oxygen via a nozzle, particularly via a nozzle head. The shortcoming of this method is that it requires a relatively large mixing volume and a relatively long mixing zone in order to obtain a fully uniform mixture. In US4573803A, corrosive fluid is injected into the pipeline via a nozzle. US3706534A and WO2009102311A2 strive to achieve distribution across the mainstream cross section, but there is a deflection of the mainstream causing high pressure loss. In addition, only by a large mixing length can the rectification of flow be achieved here. In DE3037817A1, rectification of mainstream and distribution on the cross section are achieved by injecting oxygen perpendicular to the flow direction. However, this produces a combustible volume in the region of potential particle collision surfaces. In summary, mixing processes so far have been associated with large mixing lengths or large mixing volumes and the problem of mixing reactive gases has not been solved satisfactorily without excluding particles potentially entrained in the gas as ignition sources.

[0004] In this context, it is furthermore an object to provide an apparatus and a method for mixing gases, in particular for mixing reactive gases such as oxygen or oxygen-containing gases with gaseous hydrocarbons, while alleviating one or more of the problems discussed above. The mixing here should preferably be carried out in an efficient manner, for example, when mixing with a short mixing length or a small mixing volume, a sufficiently homogeneous mixture should be obtained. Preferably, when mixing the reactive gases, the formation of a combustible gas volume should also be excluded as far as possible or at least kept as low as possible, that is, kept as short as possible in time and / or space, so that the mixing of the reactive gases is as safe as possible. Preferably, the release of ignition energy, in particular in the region of any combustible gas volume, should be reduced or preferably excluded.

[0005] The present invention provides a device for mixing gases, comprising

[0006] a main pipe 1 into which are inserted a plurality of plates 2 arranged parallel to one another, which extend from one pipe wall of the main pipe 1 to the opposite pipe wall and are oriented with their flat sides 3 parallel to the longitudinal direction of the main pipe 1, and a distributor pipe 4 from which, outside the main pipe 1, a plurality of supply lines 4a branch off,

[0007] Each supply line 4a leads to a separate plate 2 and is connected in the plate 2 to a plurality of channels 5 which are connected to the main pipeline 1 via outlet openings 6,

[0008] The outlet opening 6 is installed at the end surface of the plate 2 facing away from the gas flow when the gas flows through the main pipeline 1 .

[0009] exist Figures 1 to 3 Such a device with a further preferred configuration is described by way of example in .

[0010] Figure 1 A cross section through the main duct 1 is shown with a top view of the end face of the plate 2 and the outlet opening 6 of the plate 2 and with a top view of the distribution duct 4 and the supply line 4a.

[0011] Figure 2 is a longitudinal section through the main duct 1 with a cross section through the end face of the plate 2 and the channels 5 and outlet openings 6 of this plate 2 and a cross section through the distribution duct 4 and the supply line 4a.

[0012] Figure 3 is a cross section through the plate 2 , the supply line 4 a and the outlet opening 6 , and a longitudinal section through the channel 5 of the plate 2 .

[0013] The invention also provides a method for mixing gases, wherein, in the device according to the invention,

[0014] The first gas passes through the main pipeline 1 and

[0015] The secondary gas is introduced into the distribution duct 4 and is transported via the supply line 4 a and the channel 5 through the plate 2 and flows into the main duct 1 via a plurality of outlet openings 6 .

[0016] The plate 2 is preferably in the shape of a cube with two longer sides, preferably sides of different lengths, and a shorter side. The two flat sides 3 of the plate 2 are usually its two largest surfaces. The flat sides 3 of the plate 2 are usually aligned parallel to the longitudinal direction of the main conduit 1, preferably parallel to the flow direction of the first gas through the main conduit 1.

[0017] The two opposite end faces of the plate 2 are usually oriented perpendicularly to the longitudinal direction of the main pipe 1, preferably perpendicularly to the flow direction of the first gas through the main pipe 1. The wide sides or in particular the long sides of the plate 2 are preferably oriented transversely to the longitudinal direction of the main pipe 1. The long sides or in particular the wide sides of the plate 2 are preferably oriented in the direction of the pipe wall of the main pipe 1.

[0018] The plate 2, in particular the wide side of the plate 2, can be fixed to, for example, a pipe wall of the main pipe 1. Preferably, the plate 2, in particular the wide side of the plate 2, penetrates the pipe wall of the main pipe 1. The contact point of the plate 2 and the main pipe 1 is usually airtightly sealed. The plate 2 and the main pipe 1 can be connected to each other by, for example, welding. The plate 2 is usually firmly inserted into the main pipe 1.

[0019] The end face of the plate 2 located in the main conduit 1 or the segment of the end face of the plate 2 located in the main conduit 1 may be of any shape, but is preferably flat or circular. Preferably, when the gas, especially the first gas, flows through the main conduit 1, or when the gas flows onto the plate 2, the end face of the plate 2 facing the gas flow is circular. Preferably, when the gas, especially the first gas, flows through the main conduit 1, or when the gas does not flow onto the plate 2, the end face of the plate 2 facing away from the gas flow is flat or angled.

[0020] Preferably ≥ 2, more preferably ≥ 4 and most preferably ≥ 6 plates 2 arranged parallel to each other according to the invention are inserted into the main pipe 1 .

[0021] In the cross section through the main pipe 1 and the plates 2, the total cross-sectional area of ​​the plates 2 arranged parallel to each other is preferably 20% to 60%, more preferably 30% to 50% of the cross-sectional area of ​​the main pipe 1. The cross-sectional area of ​​the main pipe 1 in this context generally refers to the inner diameter of the preferably circular main pipe 1.

[0022] The thickness of the plate 2 is in principle variable and can be interpreted by the person skilled in the art in a conventional manner and is guided, for example, by the diameter of the channel 5 , the standard safety requirements for handling gases under pressure in the specific case and the desired mechanical stability of the plate 2 in the individual case.

[0023] The thickness of the plate 2 is preferably 3 to 10 cm.

[0024] The distance between two adjacent parallel plates 2 is preferably 5 to 15 cm.

[0025] By means of the preferred configuration and number of plates 2 , for example, pressure losses of the gas when flowing through the main line 1 and through the device according to the invention can be reduced and rectification of the main flow in the region of the device according to the invention can be achieved.

[0026] The channels 5 of the plate 2 preferably branch off vertically from the supply line 4a.

[0027] The gas flowing out of the outlet opening 6 of the plate 2 (also referred to as second gas) preferably has the same flow direction as the gas flowing through the main duct 1 (also referred to as first gas).

[0028] The outlet openings 6 of one or more (preferably all) plates 2 are preferably mounted perpendicular to the cross section of the main duct 1. All outlet openings 6 of all plates 2 arranged parallel to each other according to the invention are preferably arranged so that all outlet openings 6 are in a plane perpendicular to the cross section of the main duct 1. This also makes it possible to counteract the formation of combustible volumes in areas where particles may collide with, for example, the duct wall or internal components; this means that the release of ignition energy in the area of ​​any combustible gas volume can be reduced or excluded, for example, with this configuration of the device.

[0029] The orientation of the outlet opening 6 in the flow direction of the gas in the main duct 1 helps, for example, to prevent any particles present in the main duct 1 or carried by the gas in the main duct 1 from colliding with the duct wall of the main duct 1 due to turbulent mixing with the gas flowing out of the outlet opening 6, and thus resisting possible ignition processes. The preferred plate 2 with flat or rounded end faces also helps to achieve this.

[0030] Preferably, the outlet opening 6 of the plate 2 and the channel 5 are designed such that a pressure loss of the gas flow through the channel 5 prevents a backflow of gas from the main conduit 1 into the channel 5 .

[0031] The diameter of the outlet opening 6 is preferably ≧1 mm, more preferably 2 to 5 mm, and most preferably 2.5 to 4.5 mm.

[0032] The diameter of the channel 5 is preferably ≥ 1 mm, more preferably 2 to 5 mm, and most preferably 2.5 to 4.5 mm.

[0033] The length of the channel 5 preferably corresponds to ≥50%, more preferably ≥60%, and most preferably 2 / 3 of the length (especially width) of the plate. The length of the channel 5 is preferably ≤95%, more preferably ≤85%, and most preferably ≤75% of the length (especially width) of the plate. The channel 5 has a length of preferably at least 5 cm, more preferably at least 10 cm.

[0034] Based on 1m of main pipeline 1 2 The number of outlet openings 6 is preferably ≥100, more preferably ≥300, and most preferably ≥700. The cross-sectional area is usually determined at the point of the main conduit 1 where the outlet openings 6 are present. The cross-sectional area of ​​the main conduit 1 generally refers to the inner diameter of the preferably circular main conduit 1 in this context.

[0035] The outlet openings 6 are preferably evenly distributed over the entire cross-section of the main pipe 1, provided that the distance of the outlet openings 6 from the inner wall of the main pipe 1 is preferably greater than the distance between two adjacent outlet openings 6 of the plate 2. The outlet openings 6 of each plate 2 are preferably evenly distributed on one end face of the plate 2, preferably at a greater distance from the inner wall of the main pipe 1. These configurations can also help different gases to mix more effectively with each other.

[0036] The outlet opening 6 of the plate closest to the inner wall of the main pipe 1 is preferably at a distance of 3% to 15%, more preferably 5% to 10% of the diameter of the main pipe 1. This is advantageous for counteracting the formation of a flammable mixture of the mixing gas on the inner wall of the main pipe 1.

[0037] The outlet opening 6 is preferably deburred.

[0038] The total cross-sectional area of ​​all channels 5 is preferably less than 60% of the cross-sectional area of ​​the supply line 4a, more preferably less than 40%. The total cross-sectional area of ​​all supply lines 4a is preferably less than 66% of the cross-sectional area of ​​the distribution pipe 4, more preferably less than 40%. The pressure loss of the gas when flowing through the channel 5 is preferably greater than the total pressure loss of the gas when flowing through the distribution pipe 4 and the supply line 4a. Preferably, based on the total pressure loss of the gas when flowing through the distribution pipe 4, the supply line 4a and the channel 5, the pressure loss of the gas when flowing through the channel 5 is ≥50%, more preferably ≥70%. Through these preferred embodiments, the mixing efficiency of the gas can also be improved.

[0039] Preferably, at least 2, more preferably at least 4 and particularly preferably at least 6 supply lines 4a branch off from the distribution pipe 4. Most preferably, the number of supply lines 4a branching off from the distribution pipe 4 is the same as the number of plates inserted parallel to each other in the main pipe 1 according to the invention.

[0040] Preferably, each supply line 4 a tapers at the point where the supply line 4 a branches off from the distribution conduit 4 .

[0041] Each supply line 4a within the plate 2 preferably extends parallel to a wide side of the plate 2, more preferably parallel to a long side of the plate 2. The supply lines 4a are preferably oriented transversely to the longitudinal direction of the main conduit 1 .

[0042] In a preferred embodiment, the supply lines 4a do not pass completely through the plate 2. In this embodiment, the supply lines 4a end in the respective plate 2. In an alternative preferred embodiment, one or more or all supply lines 4a extend from one end of the plate 2 as far as the other end of the plate 2. This embodiment is preferred in order to attach, for example, a pressure measuring device to the end of the supply line 4a facing away from the distribution pipe 4.

[0043] The velocity of the second gas when leaving the outlet opening 6 is preferably greater than the velocity of the first gas in the section of the main duct 1 where the plate 2 is located. The velocity of the second gas when leaving the outlet opening 6 is preferably twice as high, more preferably three times as high, as the velocity of the first gas in the space upstream of the plate 2 in the main duct 1, in particular directly upstream of the plate 2.

[0044] Preferably, there are no control devices mounted on the channels 5 and / or the outlet openings 6 of the plate 2 , for example no control unit for controlling the pressure or flow rate of the gas. These parameters are preferably set via the supply of gas into the distribution duct 4 .

[0045] The main pipe 1 is preferably linear or straight in the region where the plate 2 is inserted into the main pipe 1, in particular at the insertion point. Particularly preferably, the main pipe 1 has no bends, no tapers or no widenings here. The main pipe 1 is preferably linear or straight.

[0046] By means of preferred construction and process parameters with regard to the distribution duct 4, the supply line 4a, the channel 5, the plate 2 and the outlet opening 6, for example a backflow of gas in the channel 5 can be counteracted. This can also improve the safe operation of the device according to the invention.

[0047] The device according to the invention may for example be an integral part of a pipeline or plant unit or preferably be mounted in a pipeline via a flange.

[0048] The device according to the invention can be manufactured from common materials common in plant engineering for the corresponding gases and applications, for example stainless steel.

[0049] The first gas and the second gas preferably react with each other.The first gas and the second gas can in both cases be pure gases or gas mixtures.

[0050] The first gas is introduced into the main pipeline 1. The first gas is preferably a combustible gas. The first gas preferably contains one or more hydrocarbons, more preferably ≥50% by volume and most preferably ≥95% by volume hydrocarbons based on the total volume of the first gas. The first gas preferably does not contain non-gaseous components.

[0051] The second gas is introduced into the distribution conduit 4. The second gas preferably contains oxygen, more preferably ≥ 20% by volume and most preferably ≥ 95% by volume oxygen, based on the total volume of the second gas. Purely for the sake of clarity, it should be noted that the device is not limited to the injection of pure oxygen or oxygen-containing mixtures.

[0052] The gas flowing through the distribution duct 4 preferably has a pressure greater than the pressure of the gas or gas mixture near the outlet opening 6. The actual pressure can be adjusted in the usual manner by the person skilled in the art according to the requirements in the individual case, and the device itself is designed accordingly in a conventional manner.

[0053] Preferably, the gases to be mixed have the same temperature. The actual temperature depends on the requirements in the individual case. In principle, the device can be operated at the temperature or temperature range required in the corresponding process. Preference is given to temperatures that are sufficiently far from the ignition temperature. Conventional temperatures can be selected from the point of view of a person skilled in the art; the temperature of the gases is preferably above the corresponding dew point of the gases to be mixed. The dew point can be taken from standard works, for example Poling, Bruce E., John M. Prausnitz and John P. O'Connell, "The properties of gases and liquids", Volume 5, New York: Mcgraw-hill, 2001, ISBN: 978-0071189712.

[0054] In principle, the gas mixture produced according to the invention can contain any desired ratio of the first gas and the second gas. Based on the total volume of the gas mixture, the gas mixture produced according to the invention preferably contains 1% to 99% by volume, more preferably 3% to 30% by volume and most preferably 5% to 15% by volume of oxygen. Based on the total volume of the gas mixture, the gas mixture produced according to the invention preferably contains 1% to 99% by volume, more preferably 20% to 80% by volume and most preferably 50% to 70% by volume of hydrocarbons. The composition of the gas mixture produced according to the invention is preferably at least 20%, more preferably at least 15% and most preferably at least 10% below the lower ignition threshold of the gas mixture produced according to the invention. The lower ignition threshold can be taken from standard work and is also determined, for example, by the German Federal Office for Materials Research and Testing.

[0055] The device according to the invention and the method according to the invention are particularly suitable for metering oxygen into hydrocarbon gas streams. This is necessary in many industrial-scale processes, for example in the production of vinyl acetate or ethylene oxide.

[0056] The device according to the invention and the method according to the invention allow a uniform and efficient mixing of the gases, which is advantageously manifested, for example, in a short mixing length, a small mixing volume or a mixing zone of short length and thus, by association, a short mixing time.

[0057] The procedure of the invention is particularly advantageous for mixing reactive gases, in particular for mixing oxygen or oxygen-containing gases with hydrocarbon-containing gases, because the inherent potential risks with respect to the combustible gas volume and ignition sources can be significantly mitigated here. Thus, by minimizing the mixing volume according to the invention, the possible combustible volume can also be minimized. Furthermore, the introduction of the gas via the distribution pipe 4, the supply line 4a, the channel 5 and the plate 2 according to the invention means that any particles that are usually carried or entrained in the gas flow do not become ignition sources, because their collision with the pipe wall or internal components and the ignition energy released in the region of the combustible gas volume can at least be reduced or even completely eliminated.

[0058] In summary, the mixing process according to the invention makes it possible to achieve an advantageous rectification of the various gas flows, which contributes to the achievement of the advantageous effects according to the invention.

[0059] Furthermore, the outlet openings 6 are mounted on the side of the plates 2 facing away from the flow, which means that particle collision surfaces cannot occur in the region of the mixing volume and the separate mixing zones created downstream of the plates 2 are located in the flow shadows of these plates 2. Since these separate mixing zones are not continuous, generally the ignition of one mixing zone does not ignite all other mixing zones as well. This further reduces safety risks and further reduces the impact on the device and its environment.

[0060] In the method according to the invention, the inventive design of the device according to the invention advantageously contributes to keeping low the pressure losses of the gas flow in the main duct 1. In particular, deflections or constrictions of the main flow, which are common in conventional mixing devices but lead to pressure losses, can be omitted.

[0061] All these advantages culminate in very rapid, efficient, homogeneous mixing of the gas streams associated with safe operation of the device with relatively low pressure losses and without loss of capacity.

[0062] The following examples serve to illustrate the present invention in more detail and should not be construed as limiting in any way.

[0063] Hydrocarbon-containing stream A:

[0064] The hydrocarbon-containing stream A consists of 60% by volume of ethylene, 15% by volume of CO 2 , 15% by volume of acetic acid and 10% by volume of inert gas and has a mass flow rate of 40 kg / s.

[0065] Oxygenated Flow B:

[0066] The oxygen-containing stream B consisted of 99.5% by volume oxygen and 0.5% by volume argon and had a mass flow rate of 2 kg / s.

[0067] Gas mixtures produced from streams A and B in Example 1 and Comparative Example 2:

[0068] The gas mixture has an oxygen content of 6% by volume, thus below the theoretical ignition threshold of 8% by volume oxygen in an ethylene-oxygen mixture.

[0069] However, during the mixing process of stream A with stream B, starting from an oxygen content of 99.5% by volume in stream B, a flammable range of local oxygen concentrations from 99.5% by volume to 8% by volume (ignition threshold) is entered.

[0070] The energy input required to ignite this gas mixture is between 0.001 and 0.07 mJ, depending on the oxygen content of the ethylene-oxygen mixture. At the mass flow rates of streams A and B, this ignition energy can be released simply by particles weighing μg hitting the pipe walls.

[0071] Embodiment 1:

[0072] The following mixing apparatus was used:

[0073] The mixing device comprises a DN500 pipe as main pipe 1 into which seven plates 2 are inserted which are arranged parallel to each other and welded to opposite pipe walls of the main pipe 1. The flat sides 3 of the plates 2 are oriented parallel to the longitudinal direction of the main pipe 1 here.

[0074] Branching off from the distribution conduit 4 at the outer part of the main conduit 1 are seven supply lines 4a. Each supply line 4a penetrates and passes through the plate 2. In the plate 2, a channel 5 branches vertically from each supply line 4a.

[0075] Starting from the distribution line 4 , via the supply line 4 a and the channel 5 , the gas can be introduced into the main line 1 through the outlet opening 6 .

[0076] The outlet opening 6 is installed at the end surface of the plate 2 facing away from the gas flow when the hydrocarbon-containing gas flow A flows through the main pipeline 1 .

[0077] In such a mixing device, a hydrocarbon-containing stream A is conveyed through a main line 1 .

[0078] The oxygen-containing stream B is introduced into the distribution conduit 4 and mixes with the hydrocarbon-containing stream A when leaving the outlet opening 6 .

[0079] The end surface of the plate 2 through which the hydrocarbon-containing flow A in the main pipeline 1 flows is circular.

[0080] The end surface of the plate 2 in the main pipe 1 facing away from the flow direction of the hydrocarbon-containing stream A is flat.

[0081] The combustible volume in Example 1 is less than 20 liters and extends over a length of less than 30 cm. In this area, a homogeneous gas mixture is formed.

[0082] In such a system, the pressure increase at which ignition may occur is less than 0.5 bar.

[0083] Therefore, the mixing length is short and the mixing volume is small, so that mixing occurs efficiently.

[0084] The device according to the invention ensures that no flammable mixtures are formed in the region of the pipe walls and on the internal components, in particular in the region of the pipe walls of the main pipe 1 .

[0085] Furthermore, the device according to the invention ensures that flows A and B or a mixture thereof flow through the main duct 1 in the same direction and that the entrained particles do not collide with the duct walls or internal components in the combustible mixing zone, thereby releasing no ignition energy in the combustible mixing zone.

[0086] Comparative Example 2:

[0087] The mixing device comprises a DN500 pipe as main pipe 1, into which a conventional nozzle with a radial oxygen supply line is inserted.

[0088] A hydrocarbon-containing stream A is conveyed through a main pipeline 1 .

[0089] The nozzle has small holes distributed on the outer circumference of the main pipe 1 , and the oxygen-containing flow B is introduced into the hydrocarbon-containing flow A in the main pipe 1 through the small holes.

[0090] In Comparative Example 2, the combustible volume was 65 litres and extended over a length of 2 metres.

[0091] When ignition occurs, the pressure increases by more than 1.5 bar.

[0092] Disadvantageously, a combustible volume is formed at the edge of the main duct 1. Since the gas flows along the main duct 1, this means that if particles are entrained in the flow, particle collisions may occur in this area releasing ignition energy, thereby igniting the combustible volume.

Claims

1. A device for mixing gases, comprising: a main pipe 1 into which a plurality of plates 2 arranged parallel to one another are inserted, the plates extending from one pipe wall of the main pipe 1 to the opposite pipe wall and oriented with their flat sides 3 parallel to the longitudinal direction of the main pipe 1, and a distribution pipe 4 from which a plurality of supply lines 4a branch off outside the main pipe 1, Therein, each supply line 4a opens into a separate plate 2 and is connected in said plate 2 to a plurality of channels 5 which are connected to said main pipe 1 via outlet openings 6, The outlet opening 6 is installed at the end surface of the plate 2 facing away from the airflow when the gas flows through the main pipeline 1 .

2. The device for mixing gases according to claim 1, characterized in that: When the gas flows through the main pipe 1, the end surface of the plate 2 facing the gas flow is rounded, and / or When the gas flows through the main pipe 1, the end surface of the plate 2 facing away from the gas flow is flat or angled.

3. The device for mixing gases according to claim 1 or 2, characterized in that: At least four plates 2 are inserted into the main pipe 1 .

4. The device for mixing gases according to claims 1 to 3, characterized in that In the cross section passing through the main pipe 1 and the plates 2 , the total cross-sectional area of ​​all the plates 2 is 20% to 60% of the cross-sectional area of ​​the main pipe 1 .

5. The device for mixing gases according to claims 1 to 4, characterized in that The distance between two adjacent plates 2 is 5 cm to 15 cm.

6. The device for mixing gases according to claims 1 to 5, characterized in that All outlet openings 6 of all plates 2 are located in a plane perpendicular to the cross section of the main duct 1 .

7. The device for mixing gases according to claims 1 to 6, characterized in that The outlet opening 6 has a diameter of 1 mm to 5 mm and / or the channel 5 has a diameter of 1 mm to 5 mm.

8. The device for mixing gases according to claims 1 to 7, characterized in that Every 1m 2 There are at least 100 outlet openings 6 in the cross-sectional area of ​​the main pipe 1 .

9. The device for mixing gases according to claims 1 to 8, characterized in that The outlet openings 6 are evenly distributed over the entire cross section of the main pipe 1 , provided that the distance of the outlet openings 6 from the inner wall of the main pipe 1 is greater than the distance between two adjacent outlet openings 6 of the plate 2 .

10. The device for mixing gases according to claims 1 to 9, characterized in that The outlet opening 6 of the plate 2 closest to the inner wall of the main pipe 1 is at a distance from the inner wall of the main pipe 1 of 3% to 15% of the diameter of the main pipe 1 .

11. The device for mixing gases according to claims 1 to 10, characterized in that The total cross-sectional area of ​​all channels 5 is less than 60% of the cross-sectional area of ​​the supply line 4a, and / or The total cross-sectional area of ​​all supply lines 4 a is less than 66% of the cross-sectional area of ​​the distribution pipe 4 .

12. A method for mixing gases, wherein: In the device according to claims 1 to 11, The first gas passes through the main pipeline 1, and The secondary gas is introduced into the distribution duct 4 , conveyed via the supply line 4 a and the channels 5 through the plate 2 and flows via a plurality of outlet openings 6 into the main duct 1 .

13. The method for mixing gases according to claim 12, characterized in that The velocity of the second gas when leaving the outlet opening 6 is greater than the velocity of the first gas in the section of the main duct 1 where the plate 2 is located.

14. The method for mixing gases according to claim 12 or 13, characterized in that The first gas contains ≥50% by volume of one or more hydrocarbons, based on the total volume of the first gas, and / or The second gas contains ≥ 20% oxygen by volume, based on the total volume of the second gas.

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