Gas mixing system and mixing method thereof

Abstract

The application discloses a gas mixing system and a mixing method thereof, and belongs to the technical field of gas mixing. The gas mixing system comprises a gas mixing unit, a gas mixing cabin unit and a gas introduction unit. The gas mixing unit comprises a protective shell, a mounting plate arranged at a gas outlet end of the protective shell and a gas movement assembly arranged on the mounting plate. The gas introduction unit is arranged on a side of the gas mixing cabin unit away from the gas mixing unit. The gas enters the gas mixing cabin unit through the gas mixing unit, and finally enters a combustor through the gas introduction unit. When it is necessary to adjust the flow and observe the flame, the gas flow in the gas introduction unit is adjusted. At this time, the change of the mixed gas flow can be reflected in the influence on the flame at the same time when the mixed gas enters the combustor, so that the experimental personnel can accurately record the combustion limit point.

Description

Technical Field

[0001] The present invention relates to the technical field of gas mixing, and in particular to a gas mixing system and a mixing method thereof. Background Art

[0002] In combustion tests, when the fuel or oxidant is a mixture of multiple gases, it is often necessary to pre-mix the fuel or oxidant or fuel-oxidant to facilitate subsequent experimental operations. Some experimenters may directly contact gas suppliers to bottle various mixed gases. However, this method is generally more expensive, especially when there are many mixed components. Another part of the experimenters may choose to design a mixing device or mixing system by themselves to reduce experimental costs. In existing designs, a Venturi structure or a Venturi-like structure, or a mixing chamber is generally used to mix the gases. In order to ensure a high level of mixing between the gases, the volume of the mixing device is generally set to be larger to increase the residence time of the gas.

[0003] However, under the above operating conditions, when the gas flow controller is adjusted, the response of the combustion flame to the flow change will be further delayed, which is not conducive to the accurate recording of combustion limit points such as backfire, ignition, and flameout. Summary of the Invention

[0004] In view of the above problems existing in the existing gas mixing system, the present invention is proposed.

[0005] Therefore, an object of the present invention is to provide a gas mixing device, which aims to solve the problem that when adjusting the gas flow controller, the response of the combustion flame to the flow change will be further delayed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising: a gas mixing unit, comprising a protective shell, a mounting plate arranged at the gas outlet end of the protective shell, and a gas movement component arranged on the mounting plate;

[0007] A gas mixing cabin unit, comprising a gas mixing housing provided at an end of the mounting plate away from the protective housing, and a gas mixing pipe provided at the gas movement assembly and extending into the gas mixing housing;

[0008] a gas introduction unit, the gas introduction unit being arranged on a side of the gas mixing cabin unit away from the gas mixing unit;

[0009] A burner is provided on a side of the gas introduction unit away from the gas mixing cabin unit.

[0010] As a preferred solution of the gas mixing system described in the present invention, the gas movement component includes a pressure taking tube arranged on the side of the mounting plate away from the gas mixing tube, a drainage tube arranged on the side of the pressure taking tube away from the mounting plate, and a flow guide tube arranged on the side of the drainage tube away from the pressure taking tube.

[0011] As a preferred solution of the gas mixing system of the present invention, the pressure taking pipe includes a pressure taking nozzle arranged on the side of the mounting plate away from the gas mixing pipe, and a conical diffuser arranged on the side of the pressure taking nozzle away from the mounting plate.

[0012] As a preferred solution of the gas mixing system of the present invention, the guide pipe includes a conical pressure-inducing pipe arranged on the side of the guide pipe away from the conical diffuser, and a pressure-inducing nozzle arranged on the side of the conical pressure-inducing pipe away from the guide pipe.

[0013] As a preferred solution of the gas mixing system described in the present invention, the gas mixing pipe includes an air supply pipe 1 and an air supply pipe 2 vertically arranged on the gas mixing shell, the air supply pipe 1 and the air supply pipe 2 are vertically arranged relative to the gas mixing pipe, and the air supply pipe 1 and the air supply pipe 2 are symmetrically inserted vertically on the gas mixing pipe.

[0014] As a preferred solution of the gas mixing system of the present invention, the internal structure of the gas introduction unit is consistent with that of the gas mixing unit.

[0015] As a preferred solution of the gas mixing system of the present invention, the gas movement component in the gas introduction unit is connected to a side of the gas mixing pipe away from the gas mixing unit.

[0016] The beneficial effects of the present invention are as follows: the gas enters the mixing chamber unit through the gas mixing unit, and finally enters the burner through the gas introduction unit. When it is necessary to adjust the flow to observe the flame conditions, the gas flow in the gas introduction unit is adjusted. At this time, the change in the mixed gas flow rate can be reflected in real time in the impact on the flame at the same time as entering the burner, which is convenient for experimenters to accurately record the combustion limit point.

[0017] In view of the above problems existing in the existing gas mixing system, a second embodiment of the present invention is proposed.

[0018] Therefore, the present invention provides a gas mixing method based on a gas mixing system, the purpose of which is to solve the technical problems of the existing mixing device being large in size and having high costs when there are many mixing components.

[0019] In order to solve the above technical problems, the present invention provides the following technical solution: comprising the following steps:

[0020] Gas a enters the gas mixing unit through the pressure-inducing nozzle of the gas mixing unit and enters the gas mixing pipe, and gas b and gas c enter the gas mixing pipe through the gas supply pipe 1 and gas supply pipe 2 respectively;

[0021] Gas a collides vertically with gas b and gas c in the gas mixing pipe and enters the gas introduction unit, and then enters the burner through the pressure-taking nozzle of the gas introduction unit.

[0022] As a preferred embodiment of the gas mixing method of the present invention, the overall length of the gas introduction unit is 40 to 80 mm, and the diameters of the pressure-taking nozzle and the pressure-inducing nozzle in the gas introduction unit are 6 to 8 mm.

[0023] As a preferred solution of the gas mixing method of the present invention, the size ratio of the gas introduction unit to the gas mixing unit is 1:1-10.

[0024] The beneficial effects of the present invention are as follows: fuel, air and other gases enter the mixing pipe in the mixing chamber unit through the gas mixing unit, and the gas to be mixed is then vertically added to the mixing pipe through the air supply pipe. At this time, the mixed gases collide vertically with each other, thereby improving the mixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0026] Figure 1 Schematic diagram of the overall structure of the gas mixing system of the present invention.

[0027] Figure 2 Schematic diagram of the gas mixing unit structure of the present invention.

[0028] Figure 3 Schematic diagram of the internal structure of the gas mixing unit of the present invention.

[0029] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0030] Figure 5 Schematic diagram of the working process of the gas mixing system of the present invention. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0034] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0035] Example 1

[0036] Reference Figure 1 , as a first embodiment of the present invention, provides a gas mixing system, comprising,

[0037] The gas mixing unit 100 includes a protective housing 101, a mounting plate 102 disposed at the gas outlet end m of the protective housing 101, and a gas movement assembly 103 disposed on the mounting plate 102;

[0038] The gas mixing chamber unit 200 includes a gas mixing housing 201 disposed on an end of the mounting plate 102 away from the protective housing 101 and a gas mixing pipe 202 disposed on the gas movement assembly 103 and extending into the gas mixing housing 201;

[0039] The gas introduction unit 300 is provided on a side of the gas mixing chamber unit 200 away from the gas mixing unit 100;

[0040] The burner 400 is disposed on a side of the gas introduction unit 300 away from the gas mixing cabin unit 200 .

[0041] Furthermore, the gas movement component 103 includes a pressure taking tube 103a arranged on the side of the mounting plate 102 away from the gas mixing tube 202, a drainage tube 103b arranged on the side of the pressure taking tube 103a away from the mounting plate 102, and a flow guide tube 103c arranged on the side of the drainage tube 103b away from the pressure taking tube 103a.

[0042] During use, the gas enters the mixing pipe 202 in the mixing chamber unit 200 through the gas mixing unit 100, and passes through the pressure taking pipe 103a in the gas introduction unit 300. Under the action of air pressure, it passes through the drainage pipe 103b with a smaller diameter and increased local pressure, and then enters the guide pipe 103c to diffuse. At this time, under the action of the initial pressure and the drainage pipe 103b with increased local pressure, the mixed gas has higher energy. When the flow meter here is adjusted to adjust the gas flow entering the burner 400, since no corresponding gas storage device is set in the burner 400, the flame of the burner 400 will have instant feedback, which makes it convenient for the staff to observe and record the combustion limit point.

[0043] Example 2

[0044] Reference Figure 1-Figure 2 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the pressure taking pipe 103a includes a pressure taking nozzle 103a-1 arranged on the side of the mounting plate 102 away from the mixing pipe 202, and a conical diffuser 103a-2 arranged on the side of the pressure taking nozzle 103a-1 away from the mounting plate 102. During the movement of gas, when passing through the conical diffuser 103a-2, due to the internal structure of the diffuser, the gas will undergo a process of gradually transitioning from a smaller cross-section to a larger cross-section. At this time, the dynamic pressure of the gas will decrease, while the static pressure will increase, making the gas flow more stable, thereby improving the gas transportation efficiency. When the gas passes through the pressure taking nozzle 103a-1, the coordinated use of the conical diffuser 103a-2 and the pressure taking nozzle 103a-1 can effectively control and measure the flow state of the gas, thereby optimizing the gas transportation efficiency and ensuring the safe operation of the system.

[0045] Compared with Example 1, the guide pipe 103c further includes a conical pressure-guiding pipe 103c-1 arranged on the side of the drainage pipe 103b away from the conical diffuser 103a-2, and a pressure-guiding nozzle 103c-2 arranged on the side of the conical pressure-guiding pipe 103c-1 away from the drainage pipe 103b. The gas first passes through the pressure-guiding nozzle 103c-2 and enters the conical pressure-guiding pipe 103c-1 evenly and smoothly. With the help of the gradually shrinking cross-section of the conical pressure-guiding pipe 103c-1, the gas continuously and stably enters the drainage pipe 103b and then enters the conical diffuser 103a-2, effectively avoiding the generation of turbulence and eddy currents during gas movement.

[0046] Compared with Example 1, further, the mixing pipe 202 includes an air supply pipe 1 202a and an air supply pipe 2 202b vertically arranged on the mixing shell 201, and the air supply pipe 1 202a and the air supply pipe 2 202b are vertically arranged relative to the mixing pipe 202, and the air supply pipe 1 202a and the air supply pipe 2 202b are symmetrically inserted vertically on the mixing pipe 202. When the gas passes through the gas mixing unit 100 and enters the mixing pipe 202, the gas to be mixed is directly added to the mixing pipe 202 vertically through the air supply pipe 1 202a and the air supply pipe 2 202b. At this time, the gas in the mixing pipe 202 carries a large dynamic pressure when passing through the gas mixing unit 100, and is thereby fully mixed with the vertically added mixed gas, thereby improving the mixing efficiency.

[0047] Compared with Example 1, further, the internal structure of the gas introduction unit 300 is consistent with the gas mixing unit 100. After the gas passes through the gas mixing unit 100, it is further mixed and briefly stored in the gas mixing chamber. Then, the mixed gas in the gas mixing chamber enters the burner 400 as the original gas through the gas introduction unit 300. The difference is that the mixed gas, that is, the original gas, directly enters the burner 400 after passing through the conical diffuser 103a-2 and the pressure nozzle 103a-1.

[0048] Compared with Example 1, further, the gas movement component 103 in the gas introduction unit 300 is connected to the side of the mixing pipe 202 away from the gas mixing unit 100, and the gas movement component 103 in the gas introduction unit 300 integrates the mixed gas and then introduces it into the burner 400.

[0049] The remaining structures are the same as those of Example 1.

[0050] Example 3

[0051] Reference Figures 1 to 4 , which is the third embodiment of the present invention, is based on the first and second embodiments of the present invention and provides a gas mixing method based on a gas mixing system, comprising the following steps:

[0052] Gas a enters the gas mixing unit 100 through the pressure-inducing nozzle 103c-2 of the gas mixing unit 100 and enters the gas mixing pipe 202. Gas b and gas c enter the gas mixing pipe 202 through the gas supply pipe 1 202a and the gas supply pipe 2 202b respectively.

[0053] Gas a collides vertically with gas b and gas c in the mixing pipe 202 and enters the gas introduction unit 300, and enters the burner 400 through the pressure nozzle 103a-1 of the gas introduction unit 300. The vertical collision effectively increases the contact area between the mixed gases and improves their mixing efficiency.

[0054] Compared with Example 2, the overall length of the gas introduction unit 300 is further 40 to 80 mm, and the diameters of the pressure nozzle 103a-1 and the pressure nozzle 103c-2 in the gas introduction unit 300 are 6 to 8 mm. During the working process, the gas introduction unit 300 is manufactured by 3D printing and is used as a part for burners 400 with different parameters.

[0055] Compared with Example 2, further, the size ratio of the gas introduction unit 300 to the gas mixing unit 100 is 1:1 to 10. A smaller gas introduction unit 300 will make the system more sensitive to flow changes, thereby facilitating the staff to record the combustion limit point, but at the same time it will increase the instability of the system and easily cause experimental errors. Therefore, it is necessary to select gas introduction units 300 and gas mixing units 100 of different sizes according to the actual combustion conditions.

[0056] The remaining structures are the same as those of Example 2.

[0057] Example 4

[0058] Reference Figures 1 to 5 , which is the fourth embodiment of the present invention, is based on the third embodiment and provides a gas mixing method, specifically:

[0059] 1) Air enters the gas mixing unit 100 through the pressure-inducing nozzle 103c-2 of the gas mixing unit 100 at a flow rate of 10 L / min and enters the gas mixing pipe 202. Natural gas and hydrogen enter the gas mixing pipe 202 through the gas supply pipe 1 202a and gas supply pipe 2 202b at a flow rate of 1.5 L / min, respectively.

[0060] 2) Air, natural gas, and hydrogen are mixed in the gas mixing pipe 202 and enter the gas introduction unit 300. Then, they enter the burner 400 through the gas introduction unit 300. At this time, the flow rate of the mixed gas is 10 L / min.

[0061] 3) Start the burner 400 and quickly adjust the flow rate of the mixed gas using the flow meter, increasing it by 2 L / min each time.

[0062] Use flow meters to record the flow rates of single gases and mixed gases, use high-speed cameras to record flame morphology, use thermocouples to measure flame temperature distribution, and use pressure sensors to measure fuel and air pressure losses.

[0063] Combustion efficiency (%) = (theoretical energy output / actual energy output) × 100%;

[0064] Fuel consumption (L) = flow meter reading L / min × time;

[0065] Flame response time (s): the time from flow change to flame change detection;

[0066] Flame stability index: An indicator calculated based on the amplitude and frequency of flame fluctuations. The lower the value, the better the stability.

[0067] The overall length of the gas introduction unit 300 was set to 60 mm, the diameters of the pressure nozzle 103 a - 1 and the pressure nozzle 103 c - 2 were both 7 mm, and the size ratios of the gas introduction unit 300 and the gas mixing unit 100 were adjusted to 1:1, 1:2, 1:5, and 1:10. Each set of experiments was repeated three times. The test results are shown in Table 1.

[0068] Table 1

[0069]

[0070] Table 1 shows that when the overall length of the gas introduction unit 300 is 60 mm, and the diameters of the pressure nozzle 103 a - 1 and the pressure nozzle 103 c - 2 are both 7 mm, when adjusting the size ratio of the gas introduction unit 300 to the gas mixing unit 100, the larger the size of the gas mixing unit 100, the greater the combustion efficiency and flame stability of the burner 400. However, a larger gas mixing unit 100 results in greater total fuel consumption and a longer flame response time. This is because the larger the gas mixing unit 100, the greater the pressure required to maintain gas flow, resulting in pressure loss. In this case, the smaller gas introduction unit 300 cannot apply sufficient pressure to the mixed gas, thereby affecting the completeness and efficiency of combustion. However, when the size of the gas mixing unit 100 is consistent with that of the gas introduction unit 300, the flame response time is greatly shortened, but the flame stability is seriously affected. This is because if the gas mixing unit 100 is too small, the gas flow will be too slow, the mixing will be uneven, and the flame will be unstable, which will also lead to reduced combustion efficiency and increased fuel consumption. Only when the size ratio is 1:5, although the flame response time is slightly longer, the flame stability is doubled and it has better combustion efficiency.

[0071] The overall length of the gas mixing unit 100 was set to 300 mm, the diameters of the pressure nozzle 103 a - 1 and the pressure nozzle 103 c - 2 were both 35 mm, and the size ratios of the gas introduction unit 300 and the gas mixing unit 100 were adjusted to 1:1, 1:2, 1:5, and 1:10. Each set of experiments was repeated three times. The test results are shown in Table 2.

[0072] Table 2

[0073]

[0074]

[0075] It can be seen from Table 2 that increasing the size of the gas introduction unit 300 may improve the combustion efficiency and flame stability to a certain extent, but the improvement effect is limited. When the size ratio exceeds 1:5, further increasing the size of the gas introduction unit 300 will instead reduce the combustion efficiency and flame stability, and the flame response time will also be extended. This is because a larger gas introduction unit 300 will cause a greater pressure loss, thereby consuming more energy, and at the same time increase heat loss, resulting in increased fuel consumption and reduced combustion efficiency. Only when its size ratio is 1:5, although the combustion efficiency is not the highest, the flame stability and combustion efficiency are relatively good, and it also has a better flame response time.

[0076] In summary, gas introduction units 300 and gas mixing units 100 of different sizes will have a great impact on the flame response time, and different size ratios will also have a significant impact on the combustion conditions. This is because the mixing and flow of gases are complex processes. Under different conditions, different sizes and size ratios need to be adaptively selected. But overall, smaller-sized gas introduction units 300 tend to bring more stable flames and shorter flame response times. This is because smaller-sized gas introduction units 300 facilitate instant adjustment of gas flow, and stable flames also bring better combustion efficiency. Therefore, under different combustion conditions and working requirements, staff can select gas introduction units 300 and gas mixing units 100 with different parameter sizes according to actual conditions.

[0077] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0078] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gas mixing system, characterized in that: include, A gas mixing unit (100) comprises a protective shell (101), a mounting plate (102) arranged at a gas outlet end (m) of the protective shell (101), and a gas movement component (103) arranged on the mounting plate (102); A gas mixing cabin unit (200) comprises a gas mixing housing (201) provided at one end of the mounting plate (102) away from the protective housing (101), and a gas mixing pipe (202) provided at the gas movement component (103) and extending into the gas mixing housing (201); a gas introduction unit (300), the gas introduction unit (300) being arranged on a side of the gas mixing cabin unit (200) away from the gas mixing unit (100); a burner (400), the burner (400) being arranged on a side of the gas introduction unit (300) away from the gas mixing cabin unit (200); The gas movement component (103) comprises a pressure-taking tube (103a) arranged on a side of the mounting plate (102) away from the gas mixing tube (202), a drainage tube (103b) arranged on a side of the pressure-taking tube (103a) away from the mounting plate (102), and a flow guide tube (103c) arranged on a side of the drainage tube (103b) away from the pressure-taking tube (103a); The pressure-taking pipe (103a) comprises a pressure-taking nozzle (103a-1) arranged on a side of the mounting plate (102) away from the gas mixing pipe (202), and a conical diffuser (103a-2) arranged on a side of the pressure-taking nozzle (103a-1) away from the mounting plate (102); The flow guide pipe (103c) comprises a conical pressure-inducing pipe (103c-1) arranged on a side of the flow guide pipe (103b) away from the conical diffuser (103a-2), and a pressure-inducing nozzle (103c-2) arranged on a side of the conical pressure-inducing pipe (103c-1) away from the flow guide pipe (103b); The mixing pipe (202) comprises an air supply pipe 1 (202a) and an air supply pipe 2 (202b) vertically arranged on the mixing housing (201); the air supply pipe 1 (202a) and the air supply pipe 2 (202b) are vertically arranged relative to the mixing pipe (202); and the air supply pipe 1 (202a) and the air supply pipe 2 (202b) are respectively and symmetrically inserted vertically on the mixing pipe (202).

2. The gas mixing system according to claim 1, characterized in that: The internal structure of the gas introduction unit (300) is consistent with that of the gas mixing unit (100).

3. The gas mixing system according to claim 2, characterized in that: The gas movement component (103) in the gas introduction unit (300) is connected to a side of the gas mixing pipe (202) away from the gas mixing unit (100).

4. A gas mixing method based on the gas mixing system according to any one of claims 2 to 3, characterized in that: The following steps are included: Gas a enters the gas mixing unit (100) and enters the gas mixing pipe (202) through the pressure-inducing nozzle (103c-2) of the gas mixing unit (100), and gas b and gas c enter the gas mixing pipe (202) through the gas supply pipe 1 (202a) and the gas supply pipe 2 (202b), respectively; Gas a collides vertically with gas b and gas c in the gas mixing pipe (202), enters the gas introduction unit (300), and enters the burner (400) through the pressure-taking nozzle (103a-1) of the gas introduction unit (300).

5. The gas mixing method according to claim 4, characterized in that: The overall length of the gas introduction unit (300) is 40-80 mm, and the diameters of the pressure-taking nozzle (103a-1) and the pressure-inducing nozzle (103c-2) in the gas introduction unit (300) are 6-8 mm.

6. The gas mixing method according to claim 5, characterized in that: The size ratio of the gas introduction unit (300) to the gas mixing unit (100) is 1:1-10.

Images