Cyclone type gas mixer, mixing device, mixing system and method

Abstract

The invention relates to a cyclone type gas mixer, a mixing device, a mixing system and a method, the cyclone type gas mixer comprises an inverted cone frustum cylinder, the inverted cone frustum cylinder is of a cylindrical structure with two closed ends, the inverted cone frustum cylinder is provided with at least two gas inlet pipelines, the gas inlet pipelines are arranged close to the large-diameter end of the inverted cone frustum cylinder, and the gas inlet pipelines are communicated with the inverted cone frustum cylinder. And a mixed gas outlet pipeline is arranged at the small-diameter end of the inverted cone frustum barrel. According to the cyclone type gas mixer, gas mixing in a fluid cyclone state is achieved only by means of the geometrical configuration of the container, no mixing unit body is contained in the cyclone type gas mixer, but an excellent gas mixing effect can be achieved, and it is verified through analog calculation that the mixing effect is better than that of a static mixer with a built-in mixing unit body.

Description

Technical Field

[0001] The present invention relates to a cyclone gas mixer, a mixing device, a mixing system and a method, belonging to the technical field of gas mixing devices. Background Art

[0002] The mixing of different gases is one of the processes often required in the energy and chemical industries. For example, when two or more gases are mixed and a chemical reaction occurs, if the mixing effect is not good, it will affect the reaction thermodynamics and lead to low reaction output. Another example is that the combustion power generation after the blending of natural gas and hydrogen is one of the most promising technologies for reducing carbon emissions in the power industry at present. According to the different gas turbine brands and models put into use in most gas power plants, blending 15% of hydrogen in natural gas does not cause an obvious impact on the operation of the gas turbine. The uniformity inside the natural gas and hydrogen mixture gas is the key to this technology. Due to the flammable and explosive characteristics of hydrogen and natural gas, using a stirring device driven by an electric motor for the mixing of the two gases will pose certain safety hazards. Therefore, according to the clear requirements of the "Technical Regulations for Natural Gas Hydrogen Blending Stations", the mixing of the above two gases must be carried out with the help of a static mixer to ensure that the uniformity of the mixed gas is not less than 95%. The regulation defines the gas static mixer as: a mixing device without moving parts, which changes the flow state of the fluid in the pipe through the mixing unit fixed inside the pipe fitting to achieve the purpose of good dispersion and full mixing between different fluids.

[0003] The commonly used and technically mature fluid static mixers in industry include: the KSM type with an internal spiral turbulator element developed by the American company Kenics, the SMX type with staggered cross-bar elements produced by the Swiss company Sulzer, and the LPD type with semi-circular staggered baffles of an American New York machinery manufacturer. The above static mixers with mixing unit elements set inside can greatly improve the mixing effect of different fluids, especially for multiphase flow mixing, such as solid particle mixing, liquid-liquid mixing, gas-liquid mixing, etc. In terms of the mixing of different gases, since gases have a higher molecular diffusion coefficient than liquids and there is no phase interface, the mixing difficulty is relatively low, and using the above static mixers equipped with mixing unit elements inside can easily achieve the effect of full gas mixing.

[0004] Since the mixing unit is mostly a complex spiral or staggered baffle in design, the production cost of such static mixers is high compared with general containers and pipes. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a cyclone gas mixer, a mixing device, a mixing system and a method. The cyclone gas mixer realizes the gas mixing in a swirling state of the fluid only by the geometric configuration of the container. It does not contain a mixing unit inside but can achieve excellent gas mixing effect. Through simulation calculation, it is verified that the mixing effect is better than that of a static mixer with an internal mixing unit. And this design has the advantages of lower manufacturing cost and easy mass production. By combining multiple mixers in a certain pattern and coupling a pressure-changing device, a gas mixing system can be formed.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A cyclone gas mixer, comprising:

[0008] An inverted frustum-shaped cylinder body, which is a cylindrical structure with both ends closed. At least two intake pipes are arranged on the inverted frustum-shaped cylinder body. The intake pipes are arranged near the large-diameter end of the inverted frustum-shaped cylinder body, and a mixed gas outlet pipe is arranged at the small-diameter end of the inverted frustum-shaped cylinder body.

[0009] Preferably, for the cyclone gas mixer, at least two of the intake pipes are parallel to each other, and their central axes are in a plane but do not coincide.

[0010] Preferably, for the cyclone gas mixer, the diameters of at least two of the intake pipes are different from each other.

[0011] Preferably, for the cyclone gas mixer, the uniformity σ of the mixed gas at the cross-section of the outlet pipe is as follows:

[0012]

[0013] wherein, is the average molar fraction of hydrogen at the outlet cross-section, x i represents the molar fraction of hydrogen in the i-th grid at the outlet cross-section, and n is the total number of grids at the outlet cross-section.

[0014] In a second aspect of the present invention, a gas mixing device is provided, which includes several cyclone gas mixers as described in any one of the above. The mixed gas outlet pipes of each inverted frustum-shaped cylinder body are connected in series in sequence, and each intake pipe of each inverted frustum-shaped cylinder body is respectively connected to the main pipeline for transporting the gas to be mixed.

[0015] In a third aspect of the present invention, a gas mixing system is provided, which includes the above-mentioned gas mixing device, and further includes:

[0016] The first gas compressor has its inlet connected to the gas source of Gas 1 and its outlet connected to the inlet of the first gas buffer tank. The outlet of the first gas buffer tank is connected to the first gas inlet of the gas mixing device. The outlet of the gas mixing device is connected to the inlet of the mixed gas buffer tank. The outlet of the mixed gas buffer tank is connected to the inlet of the mixed gas storage tank. The first outlet of the mixed gas storage tank is connected to the first gas inlet of the gas mixing device;

[0017] The second gas compressor has its inlet connected to the gas source of Gas 2 and its outlet connected to the inlet of the second gas buffer tank. The outlet of the second gas buffer tank is connected to the second gas inlet of the gas mixing device. The second outlet of the mixed gas storage tank is connected to the second gas inlet of the gas mixing device.

[0018] In the described gas mixing system, preferably, it further includes a first gas pressure regulating valve and a second gas pressure regulating valve. The inlet of the first gas pressure regulating valve is connected to the gas source of Gas 1, and its outlet is connected to the outlet of the first gas compressor. A first gas inlet valve is further provided on the pipeline where the first gas compressor is connected to the gas source of Gas 1;

[0019] The inlet of the second gas pressure regulating valve is connected to the gas source of Gas 2, and its outlet is connected to the outlet of the second gas compressor. A second gas inlet valve is further provided on the pipeline where the second gas compressor is connected to the gas source of Gas 2.

[0020] In the described gas mixing system, preferably, a first gas buffer tank one-way valve is provided on the pipeline connecting the first gas buffer tank and the gas mixing device. The top of the first gas buffer tank is connected to a first gas buffer tank safety valve, and the bottom is connected to a first gas buffer tank pressure relief valve;

[0021] A second gas buffer tank one-way valve is provided on the pipeline connecting the second gas buffer tank and the gas mixing device. The top of the second gas buffer tank is connected to a second gas buffer tank safety valve, and the bottom is connected to a second gas buffer tank pressure relief valve.

[0022] In the described gas mixing system, preferably, a gas mixing device safety valve and a gas mixing device outlet one-way valve are provided on the pipeline connecting the gas mixing device and the mixed gas buffer tank.

[0023] In the described gas mixing system, preferably, a buffer tank outlet three-way valve is provided on the pipeline connecting the mixed gas buffer tank and the mixed gas storage tank. One outlet of the buffer tank outlet three-way valve is connected to the mixed gas utilization end.

[0024] The fourth aspect of the present invention provides a working method for a gas mixing system, including the following steps:

[0025] Gas 1 and Gas 2 enter the respective first gas compressor and the second gas compressor from the gas source, are pressurized to the required pressure conditions, and then enter the respective first gas buffer tank and the second gas buffer tank.

[0026] The two gases with adjusted pressure flow from their respective buffer tanks into the gas mixing device respectively. After being mixed inside the device, they enter the mixed gas buffer tank. The two-component gas system after mixing is transported to the utilization end of the mixed gas through the outlet of the mixed gas buffer tank, or flows to the mixed gas storage tank for short-term storage.

[0027] Due to the adoption of the above technical solutions, the present invention has the following advantages:

[0028] 1. The cyclone gas mixer of the present invention is based on the geometric configuration of an inverted frustum of a cone, which strengthens the rotational disturbance of the two gases inside the mixer. Through computational fluid dynamics verification and optimization, the homogeneity of the mixed gas at the outlet is ensured.

[0029] 2. The cyclone gas mixer of the present invention has a simpler manufacturing process and steps due to its simple geometric configuration. It does not contain complex mixing unit bodies inside, and can also ensure the mixing degree of the gas. Moreover, the manufacturing cost is lower. Only the inverted frustum of a cone needs to be designed, produced and manufactured separately, and other pipelines used in the device are all common industrial pipelines.

[0030] 3. The gas mixing system of the present invention can change the pressure of the mixed gas as needed, and connect two gas sources and the use end of the mixed product gas. On the premise that the gases can be fully mixed, through computational fluid dynamics simulation calculation, the pressure drop of the gas passing through the cyclone mixer is low.

[0031] 4. A process design is carried out for the cyclic working condition of remixing the gas that has been statically placed in the storage tank for a long time after mixing, which can avoid the stratification of the gas in the storage tank after long-term storage and ensure the uniformity of the mixed gas during use.

[0032] 5. The cyclone gas mixer and the mixing device in the gas mixing system of the present invention are static equipment, which have the characteristics of low energy consumption, good mixing effect and high safety. Brief Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the cyclone gas mixer provided by an embodiment of the present invention, where Figure a is a three-dimensional view, Figure b is a sectional top view, Figure c is a sectional front view, and Figure d is a sectional side view;

[0034] Figure 2 It is a schematic diagram of the flow trajectory and concentration of hydrogen in the mixer for the hydrogen-methane system provided by this embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the gas mixing system of the two-component system provided by this embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the gas mixing device with 5 cyclone gas mixers connected in parallel provided by this embodiment of the present invention;

[0037] The reference signs in the figure are as follows:

[0038] 1 - First gas inlet valve, 2 - Second gas inlet valve, 3 - First gas compressor, 4 - Second gas compressor, 5 - First gas buffer tank, 6 - Second gas buffer tank, 7 - Safety valve of the first gas buffer tank, 8 - Safety valve of the second gas buffer tank, 9 - Drain valve of the first gas buffer tank, 10 - Drain valve of the second gas buffer tank, 11 - First gas pressure regulating valve, 12 - Second gas pressure regulating valve, 13 - Check valve of the first gas buffer tank, 14 - Check valve of the second gas buffer tank, 15 - Gas mixing device, 16 - Safety valve of the gas mixing device; 17 - Check valve at the outlet of the gas mixing device, 18 - Mixed gas buffer tank, 19 - Safety valve of the buffer tank, 20 - Drain valve of the buffer tank, 21 - Three-way valve at the outlet of the buffer tank, 22 - Mixed gas storage tank, 23 - Safety valve of the storage tank, 24 - Drain valve of the storage tank, 25 - Three-way valve at the outlet of the storage tank. Detailed implementation manners

[0039] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The "first", "second", "third", "fourth" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0041] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure relative to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "above", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation in addition to the orientations depicted in the figure.

[0042] Commercially common and technically mature static fluid mixers include: the KSM type with built-in spiral turbulence elements developed by Chemineer Inc. of the United States, the SMX type with staggered cross-bar elements produced by Sulzer Ltd. of Switzerland, and the LPD type with semi-circular staggered baffles from a mechanical manufacturer in New York, USA. The above-mentioned static mixers with mixing unit elements internally installed can significantly improve the mixing effect of different fluids, especially for multiphase flow mixing, such as solid particle mixing, liquid-liquid mixing, gas-liquid mixing, etc. In terms of different gas mixing, since gases have a higher molecular diffusion coefficient compared to liquids and there is no phase interface, the mixing difficulty is relatively low. Using the above-mentioned static mixers equipped with mixing unit elements internally can easily achieve the effect of sufficient gas mixing. Since the mixing unit elements are mostly complexly designed spirals or staggered baffles, the production cost of such static mixers is high compared to ordinary containers and pipes.

[0043] Based on the above technical problems, the present invention provides a cyclone gas mixer. This mixer is based on the geometric configuration of an inverted frustum. After the gas enters the inside of the inverted frustum, due to the shape of the inner wall surface, the gas flow velocity and direction change, forming a vortex flow field to achieve the purpose of sufficient mixing of two gases. Through numerical simulation calculations of the fluid, the configuration optimization of the gas mixer is completed, and a combination of multiple sets of mixers in parallel is designed. The inlet is connected to a pressure-changing device to form a complete gas mixing system.

[0044] As Figure 1 shown, the cyclone gas mixer involved in the present invention includes the following components:

[0045] An inverted frustum-shaped cylinder body, on which at least two intake pipes are provided. The intake pipes are arranged near the large-diameter end of the inverted frustum-shaped cylinder body, and a mixed gas outlet pipe is provided at the small-diameter end of the inverted frustum-shaped cylinder body. Based on the geometric configuration of the inverted frustum, the present invention designs a mixing device for two gases. After the gas enters the inside of the inverted frustum, due to the shape of the inner wall surface, the gas flow velocity and direction change, forming a vortex flow field to achieve the purpose of sufficient mixing of two gases. Through numerical simulation calculations of the fluid, the configuration optimization of the gas mixer is completed, and a combination of multiple sets of mixers in parallel is designed. The inlet is connected to a pressure-changing device to form a complete gas mixing system.

[0046] Further, as Figure 1As shown in the figure, the gas inlets are set according to the gas characteristics and the content ratio of the two gases in the final mixed fluid. Taking the mixed gas of methane and hydrogen as an example, hydrogen molecules are small in volume and low in volume fraction, and enter the mixer through the inlet with a smaller pipeline diameter; methane enters through the inlet with a larger pipeline diameter to ensure that the velocities of the two gases are similar and to avoid the occurrence of countercurrent to a certain extent. The two inlet pipelines are arranged in parallel at a 180-degree angle of countercurrent, but their centerlines do not coincide. This countercurrent design ensures that after the two gases enter the mixer, based on the frustum cone effect, a swirling flow is formed more quickly to achieve the purpose of full mixing. The mixed gas flows out from the outlet. After computational fluid dynamics simulation, the results are as Figure 2 shown. Taking the mixing of hydrogen and methane at 3.5 MPa and 20 °C as an example, the mole fraction of hydrogen in the entire binary system is 15%, and the geometric configuration of the frustum cone in the mixer can make hydrogen present an obvious swirling state to ensure full mixing with methane gas. Figure 2 The simulation results of

[0047]

[0048] show that in the outlet pipeline connected to the small-diameter end of the frustum cone, the gas can still maintain a certain swirling flow, continuously improving the mixing uniformity, and the uniformity of the mixed gas in the cross-section of the outlet pipeline can be calculated according to the following formula. where i is the average mole fraction of hydrogen in the outlet cross-section, x

[0049] represents the mole fraction of hydrogen in the i-th grid of the outlet cross-section, and n is the total number of grids in the outlet cross-section. Figure 2 Taking

[0050]

[0051] as an example, the diameter ratio of the large and small ends of the frustum cone is 3:1, and the residence time of the total gas flowing through the frustum cone mixer is τ = 0.52 s. 圆锥台 and represent the volume of the frustum cone, the methane flow rate, and the hydrogen flow rate respectively.

[0052] To achieve a mixing gas uniformity of 95%, that is, σ = 95%, the ratio of the length of the outlet pipeline to the height of the frustum cone should be at least 9:2. Reducing the total gas flow rate, that is, increasing the mixing residence time of the gas in the frustum cone, can ensure that under the same mixing uniformity, the length of the required downstream pipeline is reduced.

[0053] Furthermore, as shown in Figure 4As shown in the figure, it is a mixer device in which five inverted frustum-shaped cylinders are connected in series. Each inverted frustum-shaped cylinder is provided with a mixed gas outlet pipe and two inlet pipes. The mixed gas outlet pipes of each inverted frustum-shaped cylinder are connected in series in turn; the inlet pipes of each inverted frustum-shaped cylinder are respectively connected to the main gas transmission pipe of the gas to be mixed. The inlet pipes are arranged on one side close to the large-diameter end of the inverted frustum-shaped cylinder, and the mixed gas outlet pipe is arranged at the small-diameter end of the inverted frustum-shaped cylinder.

[0054] Taking the two inlet pipes as an example, in a preferred embodiment of the present invention, the two inlet pipes are arranged in parallel, and their central axes are in a plane but do not coincide. The diameter of one inlet pipe is smaller than that of the other inlet pipe. According to the total molar fraction of the two gases, the gas mixing requirements and scale, the diameters of the inlet and outlet pipes, the diameters of the two bottom surfaces of the inverted frustum-shaped cylinder and the height can be designed.

[0055] As Figure 4 shown in the figure, multiple inverted frustums connected in parallel can handle the mixing of large-flow gases. Taking the mixing of a two-component gas as an example, the gas to be mixed passes through its respective inlet pipes and is divided into multiple airflows and enters multiple inverted frustum mixers. The gas with a lower total molar fraction or a lower flow rate after mixing flows into the mixer through the small-diameter inlet pipe, and the other gas flows in through the large-diameter inlet pipe. After the two gases are fully mixed in each inverted frustum, they flow out from the small-diameter end and are collected by the outlet pipe.

[0056] The mixer of the present invention is used for the static mixing of a two-component system gas. It is a cyclone mixer based on the geometric configuration of an inverted frustum. By forming a swirling flow of the two gases inside it, the effect of fully mixing the gases is achieved. The gas mixing system designed by the present invention can be applied to scenarios such as gas mixing before natural gas hydrogen blending power generation and the efficient mixing of other gases, and has the advantages of simple design, low cost, low energy consumption, good mixing effect, high safety, etc.

[0057] As Figure 3 shown in the figure, the present invention also relates to a two-component system gas mixing system, including a gas pressure regulating system, a gas mixing device composed of multiple gas mixers, and supporting pipelines, valves, buffer tanks, etc. Figure 4 It is an example of a gas mixing device in which 5 gas mixers are connected in parallel. The number of mixers can be determined according to their size, gas mixing scale, gas mixing conditions, etc. Specifically, the two-component system gas mixing system includes the following components:

[0058] The inlet of the first gas inlet valve 1 is connected to the gas source of gas 1 and the inlet of the first gas pressure regulating valve 11; the inlet of the second gas inlet valve 2 is connected to the gas source of gas 2 and the inlet of the second gas pressure regulating valve 12; the outlet of the first gas inlet valve 1 is connected to the inlet of the first gas compressor 3; the outlet of the second gas inlet valve 2 is connected to the inlet of the second gas compressor 4; the outlet of the first gas compressor 3 is connected to the inlet of the first gas buffer tank 5 and the outlet of the first gas pressure regulating valve 11; the outlet of the second gas compressor 4 is connected to the inlet of the second gas buffer tank 6 and the outlet of the second gas pressure regulating valve 12; the outlet of the first gas buffer tank 5 is connected to the inlet of the first gas buffer tank check valve 13; the top of the first gas buffer tank 5 is connected with a first gas buffer tank safety valve 7; the outlet of the first gas buffer tank safety valve 7 is connected to the atmosphere; the bottom of the first gas buffer tank 5 is connected with a first gas buffer tank pressure relief valve 9; the outlet of the first gas buffer tank pressure relief valve 9 is connected to the atmosphere; the outlet of the second gas buffer tank 6 is connected to the inlet of the second gas buffer tank check valve 14; the top of the second gas buffer tank 6 is connected with a second gas buffer tank safety valve 8; the outlet of the second gas buffer tank safety valve 8 is connected to the atmosphere; the bottom of the second gas buffer tank 6 is connected to the inlet of the second gas buffer tank pressure relief valve 10; the outlet of the second gas buffer tank pressure relief valve 10 is connected to the atmosphere; the outlet of the first gas buffer tank check valve 13 is connected to the first gas inlet of the gas mixing device 15; the outlet of the second gas buffer tank check valve 14 is connected to the second gas inlet of the gas mixing device 15; the outlet of the gas mixing device 15 is connected to the inlet of the gas mixing device safety valve 16 and the inlet of the gas mixing device outlet check valve 17; the outlet of the gas mixing device safety valve 16 is connected to the atmosphere; the outlet of the gas mixing device outlet check valve 17 is connected to the inlet of the mixed gas buffer tank 18; the outlet of the mixed gas buffer tank 18 is connected to the inlet of the three-way valve 21; the top of the mixed gas buffer tank 18 is connected with a buffer tank safety valve 19; the outlet of the buffer tank safety valve 19 is connected to the atmosphere; the bottom of the mixed gas buffer tank 18 is connected with a buffer tank pressure relief valve 20; the outlet of the buffer tank pressure relief valve 20 is connected to the atmosphere; the outlet of the buffer tank outlet three-way valve 21 is connected to the mixed gas utilization end; the other outlet of the buffer tank outlet three-way valve 21 is connected to the inlet of the mixed gas storage tank 22; the outlet of the mixed gas storage tank 22 is connected to the inlet of the storage tank outlet three-way valve 25; the top of the mixed gas storage tank 22 is connected with a storage tank safety valve 23; the outlet of the storage tank safety valve 23 is connected to the atmosphere; the bottom of the combined gas storage tank 22 is connected with a storage tank pressure relief valve 24; the outlet of the storage tank pressure relief valve 24 is connected to the atmosphere; the outlet of the adjustable three-way valve 25 is connected to the outlet of the check valve 13 and the inlet of the gas mixing device 15; the other outlet of the storage tank outlet three-way valve 25 is connected to the outlet of the second gas buffer tank check valve 14 and the outlet of the first gas buffer tank check valve 13.

[0059] The present invention also provides a working method for the two-component system gas mixing system, which is as follows: Gas 1 and gas 2 enter their respective first gas compressors 3 and second gas compressors 4 from the gas sources through the first gas inlet valve 1 and the second gas inlet valve 2 respectively. After being pressurized to the required pressure conditions, they enter their respective first gas buffer tanks 5 and second gas buffer tanks 6. The tops of the first gas buffer tank 5 and the second gas buffer tank 6 are respectively provided with a first gas buffer tank safety valve 7 and a second gas buffer tank safety valve 8, and the bottoms are installed with a first gas buffer tank drain valve 9 and a second gas buffer tank drain valve 10 that can communicate with the atmosphere; if gas 1 and gas 2 need to release pressure from the gas source state before mixing, they are respectively adjusted through the first gas pressure regulating valve 11 and the second gas pressure regulating valve 12, and then enter their respective first gas buffer tanks 5 and second gas buffer tanks 6 after being adjusted to the mixing pressure.

[0060] The two gases with adjusted pressure flow into the gas mixing device 15 from their respective buffer tanks through the first gas buffer tank one-way valve 13 and the second gas buffer tank one-way valve 14 respectively. After being mixed inside the device, they enter the mixed gas buffer tank 18 through the gas mixing device outlet one-way valve 17 at the outlet. A gas mixing device safety valve 16 is provided at the outlet of the gas mixing device 15, a buffer tank safety valve 19 is provided at the top of the mixed gas buffer tank 18, and a buffer tank drain valve 20 is provided at the bottom. The two-component gas system after mixing is transported to the rear-end utilization interface through the buffer tank outlet three-way valve 21 at the outlet of the mixed gas buffer tank 18, or flows to the mixed gas storage tank 22 for short-term storage.

[0061] The two-component gas mixing system of the present invention can be applied to a total of six working conditions according to the gas source conditions and the destination of the mixed gas:

[0062] Working condition 1: The pressures of the two gas sources are low, and the pressure of the required mixed gas is high. In this case, as Figure 3 shown, gas 1 and gas 2 enter the first gas compressor 3 and the second gas compressor 4 through the first gas inlet valve 1 and the second gas inlet valve 2 respectively, and the first gas pressure regulating valve 11, the second gas pressure regulating valve 12, and the storage tank outlet three-way valve 25 are kept in the closed state. The pressurized gases pass through the first gas buffer tank 5 and the second gas buffer tank 6 respectively and then proceed with the subsequent mixing process.

[0063] Working condition 2: The pressures of the two gas sources are high, and the pressure of the required mixed gas is low. In this case, the first gas pressure regulating valve 11, the second gas pressure regulating valve 12, and the storage tank outlet three-way valve 25 are kept in the closed state. Gas 1 and gas 2 pass through the first gas pressure regulating valve 11 and the second gas pressure regulating valve 12 respectively, are reduced to the required pressure, and then enter the first gas buffer tank 5 and the second gas buffer tank 6, and then proceed with the subsequent mixing process.

[0064] Operating condition 3: One of the two gas sources has a high pressure and needs to be depressurized, while the other has a low pressure and needs to be pressurized. In this case, for example, Gas 1 needs to be pressurized and Gas 2 needs to be depressurized. Gas 1 enters the first gas compressor 3 through the first gas inlet valve 1, is pressurized and then flows into the first gas buffer tank 5. Gas 2 is depressurized through the second gas pressure regulating valve 12 and then flows into the second gas buffer tank 6 before the subsequent gas mixing process can proceed. Throughout the process, the first gas pressure regulating valve 11, the second gas pressure regulating valve 12, and the storage tank outlet three-way valve 25 are in the closed state.

[0065] Operating condition 4: The mixed gas directly goes to the utilization end. In this case, the fully mixed gas flowing out from the outlet of the gas mixing device 15 passes through the check valve 17 at the outlet of the gas mixing device and the mixed gas buffer tank 18, and then goes to the mixed gas utilization end through the buffer tank outlet three-way valve 21. One end of the buffer tank outlet three-way valve 21 leading to the mixed gas storage tank 22 is in the closed state.

[0066] Operating condition 5: The mixed gas is not directly utilized but is temporarily stored in the mixed gas storage tank 22. In this case, the mixed gas from the outlet of the gas mixing device 15 passes through the check valve 17 at the outlet of the gas mixing device, flows through the mixed gas buffer tank 18, and enters the mixed gas storage tank 22 through the buffer tank outlet three-way valve 21. One end of the buffer tank outlet three-way valve 21 leading to the mixed gas utilization end is in the closed state, and the adjustable storage tank outlet three-way valve 25 is in the closed state.

[0067] Operating condition 6: No gas source flows into the system, and the mixed gas already existing in the mixed gas storage tank 22 is utilized. If the storage time of the mixed gas in the mixed gas storage tank 22 is short, the utilization end can be directly connected to the storage tank relief valve 24. If the storage time is long, to ensure the uniformity of the mixed gas, the mixed gas needs to be remixed in the system. According to the designed gas velocity of the inlet pipeline, the storage tank outlet three-way valve 25 is adjusted. After the mixed gas re-enters the gas mixing device 15 and is mixed, it flows into the mixed gas storage tank 22. After repeating the above operations many times, the mixed gas can directly flow to the mixed gas utilization end through the buffer tank outlet three-way valve 21.

[0068] In terms of safety, safety valves are designed for all pressure vessels (the first gas buffer tank 5, the second gas buffer tank 6, the gas mixing device 15, the mixed gas buffer tank 18, and the mixed gas storage tank 22). When an abnormal situation of excessive pressure occurs, the safety valve opens and alarms. In addition, during the gas mixing process, the gas mixing device 15 and other containers are connected by check valves to ensure the flow direction during the gas mixing process and prevent backflow.

[0069] In terms of daily maintenance, pressure relief valves are designed for all pressure vessels. During maintenance, the containers can be purged and cleaned by nitrogen purging, and the nitrogen is discharged from the pressure relief valve.

[0070] The design of the cyclone gas mixer and the parallel gas mixing device of the present invention is a pioneer, different from other static mixers with complex geometric configuration mixing units inside. Based on the design of a simple inverted frustum and inlet and outlet pipes, the present invention enables the gas to form a swirling flow inside the inverted frustum, ensuring the full mixing of the gas at the outlet. The present invention also proposes a two-component gas mixing system, which can adjust the pressure of the mixed gas at the utilization end according to the gas source pressure, and designs a mixed gas storage tank and a reflux circulation condition, having the advantages of high efficiency, flexibility, low energy consumption, low cost, high safety, etc.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cyclone gas mixer, characterized in that: include: The inverted frustum of a cone is a cylindrical structure with closed ends. At least two air inlet pipes are arranged on the inverted frustum of a cone. The air inlet pipes are arranged near the large-diameter end of the inverted frustum of a cone, and the small-diameter end of the inverted frustum of a cone is provided with an air outlet pipe for the mixed gas.

2. The cyclone gas mixer according to claim 1, characterized in that: At least two of the air intake ducts are parallel to each other, and their central axes are in a plane but do not overlap.

3. The cyclone gas mixer according to claim 1, characterized in that: The diameters of at least two of the air intake pipes are different.

4. The cyclone type gas mixer according to claim 1, characterized in that: The uniformity σ of the mixed gas in the outlet pipe section is as follows: in, is the average mole fraction of hydrogen at the outlet cross section, x i It represents the hydrogen mole fraction in the i-th grid of the outlet section, and n is the total number of grids in the outlet section.

5. A gas mixing device, characterized in that: It comprises a cyclone gas mixer as described in any one of claims 1 to 4, wherein the mixed gas outlet pipes of each of the inverted frustum of cone cylinders are connected in series in sequence, and each of the air inlet pipes of each of the inverted frustum of cone cylinders is respectively connected to the main pipeline for conveying the gas to be mixed.

6. A gas mixing system, characterized in that: The gas mixing device (15) according to claim 5 further comprises: a first gas compressor (3), the inlet of which is connected to the gas source of gas 1, the outlet of which is connected to the inlet of a first gas buffer tank (5), the outlet of the first gas buffer tank (5) is connected to the first gas inlet of the gas mixing device (15), the outlet of the gas mixing device (15) is connected to the inlet of a mixed gas buffer tank (18), the outlet of the mixed gas buffer tank (18) is connected to the inlet of a mixed gas storage tank (22), and the first outlet of the mixed gas storage tank (22) is connected to the first gas inlet of the gas mixing device (15); A second gas compressor (4) has an inlet connected to the gas source of gas 2, and an outlet connected to the inlet of a second gas buffer tank (6), the outlet of the second gas buffer tank (6) is connected to the second gas inlet of the gas mixing device (15), and the second outlet of the mixed gas storage tank (22) is connected to the second gas inlet of the gas mixing device (15).

7. The gas mixing system according to claim 6, characterized in that: It also comprises a first gas pressure regulating valve (11) and a second gas pressure regulating valve (12), wherein the inlet of the first gas pressure regulating valve (11) is connected to the gas source of gas 1, and the outlet is connected to the outlet of the first gas compressor (3), and the first gas inlet valve (1) is also provided on the pipeline connecting the first gas compressor (3) and the gas source of gas 1; The inlet of the second gas pressure regulating valve (12) is connected to the gas source of gas 2, and the outlet is connected to the outlet of the second gas compressor (4). A second gas inlet valve (2) is also provided on the pipeline connecting the second gas compressor (4) and the gas source of gas 2.

8. The gas mixing system according to claim 6, characterized in that: A first gas buffer tank one-way valve (13) is provided on the pipeline connecting the first gas buffer tank (5) and the gas mixing device (15); the top of the first gas buffer tank (5) is connected to a first gas buffer tank safety valve (7), and the bottom is connected to a first gas buffer tank pressure relief valve (9); A second gas buffer tank one-way valve (14) is provided on the pipeline connecting the second gas buffer tank (6) and the gas mixing device (15); the top of the second gas buffer tank (6) is connected to a second gas buffer tank safety valve (8), and the bottom is connected to a second gas buffer tank pressure relief valve (10).

9. The gas mixing system according to claim 6, characterized in that: A buffer tank outlet three-way valve (21) is provided on the pipeline connecting the mixed gas buffer tank (18) and the mixed gas storage tank (22), and one outlet of the buffer tank outlet three-way valve (21) is connected to the mixed gas utilization end.

10. A working method of the gas mixing system according to any one of claims 6 to 9, characterized in that: The steps include: Gas 1 and gas 2 enter the first gas compressor (3) and the second gas compressor (4) from the gas source, respectively, and enter the first gas buffer tank (5) and the second gas buffer tank (6) respectively after being pressurized to the required pressure conditions; The two gases whose pressures have been adjusted flow from their respective buffer tanks into the gas mixing device (15) respectively, and after being mixed inside the device, enter the mixed gas buffer tank (18). The mixed two-component gas system is transported to the mixed gas utilization end through the outlet of the mixed gas buffer tank (18), or flows to the mixed gas storage tank (22) for temporary storage.

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