Premixed gas laminar flow combustion device and mounting method thereof

Abstract

The invention relates to a premixed gas laminar flow combustion device and a mounting method thereof, the device comprises an injection mechanism, a first straight pipe and a flow stabilizing mechanism, and the injection mechanism and the flow stabilizing mechanism are respectively mounted and communicated at the bottom end and the top end of the first straight pipe; the length of the first straight pipe ranges from 50 cm to 70 cm. The injection mechanism at least comprises a second injection panel, a plurality of first injection pipes and a plurality of second injection pipes are installed at the top end of the second injection panel in a staggered arrangement mode, the first injection pipes and the second injection pipes are independently arranged, and the air outlet ends of the first injection pipes and the air outlet ends of the second injection pipes communicate with the bottom end of a first straight pipe. And the air inlet ends of the first injection pipe and the second injection pipe are respectively used for introducing a combustion agent and an oxidizing agent. According to the invention, stable laminar flame can be formed, the tempering phenomenon is avoided, the safety is ensured, the flame can be prevented from being interfered by space airflow, and the accuracy of a laminar combustion test is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of laminar combustion, and in particular to a laminar combustion device for premixed gas and an installation method thereof. Background Art

[0002] Laminar combustion refers to the combustion process of combustible gas or mixture in a laminar flow state. Its characteristic is that the flow of fuel (combustion agent) and oxidant presents regular stratified movement, and there is no disordered disturbance of turbulence. The laminar combustion device has the advantages of convenient operation, simple structure and easy research. Therefore, in the research of combustion field and the combustion flame characteristics of various combustible gases, especially in the research of laminar combustion characteristics, the laminar combustion device is often used.

[0003] However, the existing laminar combustion devices have at least the following defects: 1. The existing laminar combustion devices cannot well mix the combustion agent and the oxidant sufficiently, which will lead to the flame shape formed after combustion being very prone to unclear stratification or pulsation phenomenon, and thus a stable laminar flame cannot be formed.

[0004] 2. During the test process of the existing laminar combustion devices, the flame is extremely vulnerable to the interference of the spatial air flow, resulting in an unstable flow field near the flame, which is not conducive to observing the combustion phenomenon, and thus the accuracy of the laminar combustion test cannot be guaranteed.

[0005] 3. After the test of the existing laminar combustion devices, flashback is extremely likely to occur, which will cause popping sound and noise, and may even cause an explosion, and the safety cannot be guaranteed.

[0006] Therefore, how to fully mix the combustion agent and the oxidant, thereby forming a stable laminar flame, and also stabilize the flow field near the flame, and avoid flashback phenomenon, has become an urgent problem to be solved at present. Summary of the Invention

[0007] The purpose of the present invention is to provide a laminar combustion device for premixed gas and an installation method thereof to solve the problems existing in the above-mentioned prior art.

[0008] To achieve the above purpose, the present invention provides the following solutions: In the first aspect of the present invention, a laminar combustion device for premixed gas is provided, including a jetting mechanism, a first straight pipe and a flow stabilizing mechanism, wherein: The jetting mechanism and the flow stabilizing mechanism are respectively installed and communicated at the bottom end and the top end of the first straight pipe, and the flow stabilizing mechanism is configured to be able to introduce a flow stabilizer to stabilize the flow field near the flame; The length of the first straight pipe is 50 cm - 70 cm; The injection mechanism at least includes a second injection panel. A number of first injection tubes and a number of second injection tubes are installed at the top end of the second injection panel in a staggered arrangement, and the first injection tubes and the second injection tubes are independently arranged. The air outlet ends of the first injection tubes and the second injection tubes are both communicated with the bottom end of the first straight tube, and the air inlet ends of the first injection tubes and the second injection tubes are respectively used for introducing fuel and oxidant.

[0009] According to an embodiment of the present invention, the injection mechanism further includes a first injection panel, and the second injection panel is detachably installed at the top end of the first injection panel; A second injection annular groove communicated with the air inlet end of the second injection tube is formed at the bottom end of the second injection panel, and a second communication hole communicated with the second injection annular groove is formed on the second injection panel; A first injection annular groove is formed at the top end of the first injection panel. When the second injection panel is installed at the top end of the first injection panel, the first injection annular groove is communicated with the air inlet end of the first injection tube, and the first injection annular groove and the second injection annular groove are independently arranged. A first communication hole communicated with the first injection annular groove is formed on the first injection panel; The first communication hole and the second communication hole are respectively used for introducing fuel and oxidant.

[0010] According to an embodiment of the present invention, a first air inlet pipe and a second air inlet pipe are respectively installed on the first injection panel and the second injection panel. The first air inlet pipe and the second air inlet pipe are respectively communicated with the first communication hole and the second communication hole, and the first air inlet pipe and the second air inlet pipe are respectively used for introducing fuel and oxidant.

[0011] According to an embodiment of the present invention, the number of the first injection annular grooves and the second injection annular grooves is several. A number of the first injection annular grooves are communicated with each other through the first communication hole, and a number of the second injection annular grooves are communicated with each other through the second communication hole.

[0012] According to an embodiment of the present invention, a high-temperature resistant sealing layer is provided between the first injection panel and the second injection panel.

[0013] According to an embodiment of the present invention, a connection housing is installed and communicated at the bottom end of the first straight tube. The bottom end of the connection housing is connected to the second injection panel, and the air outlet ends of the first injection tubes and the second injection tubes are both communicated with the bottom end of the connection housing.

[0014] According to an embodiment of the present invention, the flow stabilizing mechanism includes a flow stabilizing housing. The top end of the first straight pipe is coaxially installed and communicated with a second straight pipe. The cross-sectional diameter of the second straight pipe is smaller than that of the first straight pipe. An installation hole is opened at the bottom end of the flow stabilizing housing. The second straight pipe is arranged to be inserted into the flow stabilizing housing through the installation hole and abut against the inner wall of the installation hole. The top end of the flow stabilizing housing is an open structure and is installed with a flow equalizing plate. A flow equalizing plate central through hole is opened at the central position of the flow equalizing plate. The inner wall of the flow equalizing plate central through hole abuts against the outer wall of the second straight pipe. A third intake pipe is installed and communicated on the side wall of the flow stabilizing housing. The third intake pipe is used for introducing a flow stabilizing agent.

[0015] According to an embodiment of the present invention, the top end of the second straight pipe is flush with the top end of the flow equalizing plate.

[0016] According to an embodiment of the present invention, a support mechanism is arranged below the first injection panel. The support mechanism includes a support platform and a plurality of support legs. The support legs are installed at the bottom end of the support platform. The top end of the support platform is used for placing the first injection panel.

[0017] According to an embodiment of the present invention, the support mechanism further includes a placement table. The placement table is installed on the support legs.

[0018] In a second aspect of the present invention, an installation method for a premixed gas laminar combustion device is provided, which includes the following steps: S1. Install the flow stabilizing mechanism at the top end of the first straight pipe; S2. Install a plurality of first injection pipes and a plurality of second injection pipes at the top end of the second injection panel in a staggered arrangement; S3. Install the injection mechanism at the bottom end of the first straight pipe so that the gas outlet ends of the first injection pipe and the second injection pipe are both communicated with the bottom end of the first straight pipe.

[0019] The present invention has at least the following technical effects: First of all, through the arrangement of the injection mechanism and the first straight pipe with a length of 50 cm - 70 cm, the present invention can fully mix the combustion agent and the oxidant, and then the flame shape formed after combustion will not show obvious stratification or pulsation phenomenon, so that a stable laminar flame can be formed.

[0020] Secondly, through the arrangement of the first straight pipe with a length of 50 cm - 70 cm, the present invention can avoid flashback, and can also avoid causing popping sounds and noises, and further will not cause an explosion, ensuring safety.

[0021] Finally, with the setting of the flow stabilizing mechanism in the present invention, the flame can be prevented from being disturbed by the spatial airflow, which may cause instability of the flow field near the flame. Furthermore, it is beneficial to observe the combustion phenomenon and ensure the accuracy of the laminar combustion test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 is a schematic diagram of the exemplary overall structure of the present invention; Figure 2 is a schematic diagram of the exemplary overall structure of the support platform, support legs and placement platform in the present invention; Figure 3 is a schematic diagram of the exemplary overall structure of the injection mechanism in the present invention; Figure 4 is a schematic diagram of the exemplary overall structure of the first injection panel in the present invention; Figure 5 is a schematic diagram of the exemplary overall structure of the second injection panel in the present invention; Figure 6 is Figure 5 a schematic diagram of the exemplary overall structure from another angle; Figure 7 is Figure 3 a schematic diagram of the exemplary overall sectional structure of one section; Figure 8 is Figure 3 a schematic diagram of the exemplary overall sectional structure of another section; Figure 9 is a schematic diagram of the exemplary overall structure of the connection housing in the present invention; Figure 10 is Figure 9 a schematic diagram of the exemplary overall structure from another angle; Figure 11 is a schematic diagram of the exemplary overall structure of the first straight pipe and the second straight pipe in the present invention; Figure 12 is a schematic diagram of the exemplary overall structure of the flow stabilizing mechanism in the present invention; Figure 13 is Figure 12 a schematic diagram of the exemplary overall structure from another angle; Figure 14 is Figure 12 a schematic diagram of the exemplary overall sectional structure; Explanation of reference numerals: 1. Bracket; 2. Leg; 3. Placing table; 4. First injection panel; 5. First intake pipe; 6. First injection annular groove; 7. First communication hole; 8. First injection pipe; 9. Second injection panel; 10. Second intake pipe; 11. Second injection annular groove; 12. Second communication hole; 13. Second injection pipe; 14. Connecting housing; 15. First straight pipe; 16. Flow stabilizing housing; 17. Third intake pipe; 18. Flow equalizing plate; 19. Second straight pipe; 20. Mounting hole; 21. Central through hole of the flow equalizing plate. Detailed implementation mode

[0024] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are used to exemplarily illustrate the principle of the present invention, and are not configured to limit the present invention. In addition, the components in the drawings are not necessarily drawn to scale. For example, the sizes of some components or regions in the drawings may be enlarged for other components or regions to help understand the embodiments of the present invention.

[0025] The orientation terms appearing in the following description are all the directions shown in the figures, and do not limit the specific structure of the embodiments of the present invention. In the description of the present invention, it should be noted that unless otherwise specified, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the terms "including", "comprising", "having" or any other variant thereof are intended to cover non-exclusive inclusion, so that a series of elements, structural components or components include not only those elements, but also other structural components inherent to the structural components and components that are not explicitly listed. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the articles or devices including the elements.

[0027] Spatial relationship terms such as "below", "beneath", "under", "lower", "above", "on", "higher", etc. are used for convenience of description to explain the positioning of one element relative to a second element, and are intended to cover different orientations of the device in addition to orientations different from those shown in the figures. Additionally, for example, "one element is on / under another element" may mean that the two elements are in direct contact or that there are other elements between the two elements. Furthermore, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and do not particularly refer to order or sequence and should not be construed as limiting. Similar terms denote similar elements throughout the description.

[0028] For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is merely provided to better understand the present invention by showing examples of the present invention.

[0029] For convenience of description, in the content of this embodiment, there may be descriptions such as "this device". Those skilled in the art should understand that "this device" refers to a premixed gas laminar combustion device provided by the present invention.

[0030] Referring to Figures 1 - 14 , in a first aspect of the present invention, there is provided a premixed gas laminar combustion device, which at least includes a jetting mechanism, a first straight pipe 15, and a flow stabilizing mechanism, wherein: Referring to Figure 1 , the jetting mechanism and the flow stabilizing mechanism are respectively installed and connected to the bottom end and the top end of the first straight pipe 15, and the flow stabilizing mechanism is configured to be able to introduce a flow stabilizing agent to stabilize the flow field near the flame, thereby facilitating the observation of the combustion phenomenon and ensuring the accuracy of the laminar combustion test.

[0031] In this embodiment, the flow stabilizing agent can be an inert gas known in the art, such as nitrogen, etc., and is not particularly limited herein.

[0032] According to an embodiment of the present invention, the length of the first straight pipe 15 is 50 cm - 70 cm, preferably 60 cm. Among them, the first straight pipe 15 with a length of 50 cm - 70 cm can effectively avoid the flashback phenomenon occurring after the test, and also avoid causing popping sounds and noises, thereby avoiding explosion and ensuring safety.

[0033] In this embodiment, referring to Figure 11 , the first straight pipe 15 can be a cylindrical structure. Among them, the inner diameter of the first straight pipe 15 can be 20 cm ± 1 cm, preferably 20 cm; the wall thickness of the first straight pipe 15 can be less than 2 mm, preferably 2 mm.

[0034] According to an embodiment of the present invention, referring to Figure 3 , specifically, the injection mechanism at least includes a second injection panel 9. At the top of the second injection panel 9, a plurality of first injection pipes 8 and a plurality of second injection pipes 13 are installed in a staggered arrangement, and the first injection pipes 8 are not interconnected with the second injection pipes 13, that is, the first injection pipes 8 and the second injection pipes 13 are independently arranged. The gas outlet ends of the first injection pipes 8 and the second injection pipes 13 (that is, Figure 3 the tops of the first injection pipes 8 and the second injection pipes 13 in

[0035] ) are both connected to the bottom end of the first straight pipe 15. The gas inlet ends of the first injection pipes 8 and the second injection pipes 13 are respectively used for introducing fuel and oxidant.

[0036] In this embodiment, the fuel and the oxidant can be fully mixed by a plurality of first injection pipes 8 and a plurality of second injection pipes 13 arranged in a staggered manner in the injection mechanism (that is, a plurality of first injection pipes 8 and a plurality of second injection pipes 13 installed at the top of the second injection panel 9 in a staggered manner), so that the flame shape formed after combustion will not have obvious stratification or pulsation phenomenon, and a stable laminar flame can be formed.

[0037] In addition, the first straight pipe 15 with a length of 50 cm - 70 cm can further enable the fuel and the oxidant to be fully mixed in the first straight pipe 15, thereby further ensuring the stability of the laminar flame.

[0038] According to an embodiment of the present invention, referring to Figures 3 - 6 , the injection mechanism further includes a first injection panel 4, and the second injection panel 9 is detachably installed at the top of the first injection panel 4.

[0039] In this embodiment, referring to Figure 6 , four threaded holes are provided at the edge of the second injection panel 9 at the same angle, and four threaded holes (not shown in the figure) can also be provided at the corresponding positions of the first injection panel 4. Thus, the second injection panel 9 can be installed at the top of the first injection panel 4 through bolts known in the art.

[0040] In this embodiment, referring to Figure 5 and Figure 6 , both the first injection pipes 8 and the second injection pipes 13 are installed vertically at the top of the second injection panel 9.

[0041] In this embodiment, both the first injection panel 4 and the second injection panel 9 can be flat cylindrical structures, and the cross-sectional diameters of the first injection panel 4 and the second injection panel 9 are the same.

[0042] In this embodiment, the installation methods between the first injection pipe 8 and the second injection panel 9, and between the second injection pipe 13 and the second injection panel 9 can both be detachable connections through threads. For example, external threads (not shown in the figure) are provided at the bottom ends of the first injection pipe 8 and the second injection pipe 13, and a plurality of internal threaded holes corresponding to the first injection pipe 8 and the second injection pipe 13 are provided at the top end of the second injection panel 9. Thus, the first injection pipe 8 and the second injection pipe 13 can be detachably connected to the second injection panel 9 through threads.

[0043] Further, a high-temperature resistant sealant known in the art, such as polyimide sealant, etc., is applied to the threaded connection parts between the first injection pipe 8 and the second injection panel 9, and between the second injection pipe 13 and the second injection panel 9, and no special limitation is made here. This can improve the sealing performance between the first injection pipe 8 and the second injection panel 9, and between the second injection pipe 13 and the second injection panel 9.

[0044] According to an embodiment of the present invention, referring to Figure 6 , a second injection annular groove 11 communicating with the air inlet end (i.e., the bottom end of the second injection pipe 13) of the second injection pipe 13 is provided at the bottom end of the second injection panel 9, a second communication hole 12 communicating with the second injection annular groove 11 is provided on the second injection panel 9, and one end of the second communication hole 12 far from the second injection annular groove 11 communicates with the outside of the second injection panel 9.

[0045] Referring to Figure 4 , a first injection annular groove 6 is provided at the top end of the first injection panel 4. When the second injection panel 9 is installed at the top end of the first injection panel 4 (i.e., when the first injection panel 4 and the second injection panel 9 are in the state in Figure 3 ), the first injection annular groove 6 will communicate with the air inlet end (i.e., the bottom end of the first injection pipe 8) of the first injection pipe 8, and the first injection annular groove 6 does not communicate with the second injection annular groove 11, that is, the first injection annular groove 6 and the second injection annular groove 11 are independently arranged (reference can be made to Figure 7 and Figure 8 ), a first communication hole 7 communicating with the first injection annular groove 6 is provided on the first injection panel 4, and one end of the first communication hole 7 far from the first injection annular groove 6 communicates with the outside of the first injection panel 4.

[0046] In this embodiment, the first communication hole 7 and the second communication hole 12 are respectively used for introducing the fuel agent and the oxidant. It should be understood by those skilled in the art that the above description does not specifically limit that only the fuel agent can be introduced into the first communication hole 7 and only the oxidant can be introduced into the second communication hole 12. That is to say, the above content is only one embodiment of the present invention. In other words, the oxidant can also be introduced into the first communication hole 7 and the fuel agent can be introduced into the second communication hole 12.

[0047] In this embodiment, the cross-sections of the first injection annular groove 6 and the second injection annular groove 11 can both be rectangular structures, and their overall shapes can both be regular circular ring structures.

[0048] According to an embodiment of the present invention, referring to Figures 3 - 6 , a first intake pipe 5 and a second intake pipe 10 are respectively installed on the first injection panel 4 and the second injection panel 9. The first intake pipe 5 and the second intake pipe 10 are respectively connected to the first communication hole 7 and the second communication hole 12, and the first intake pipe 5 and the second intake pipe 10 are respectively used for introducing the fuel agent and the oxidant.

[0049] In this embodiment, referring to Figure 4 , the number of the first intake pipes 5 can be two, and the two first intake pipes 5 can be symmetrically arranged on the side wall of the first injection panel 4 in sequence. Referring to Figure 6 , the number of the second intake pipes 10 can also be two, and the two second intake pipes 10 can be symmetrically arranged on the side wall of the second injection panel 9 in sequence. Referring to Figure 3 , from the axial direction of the second injection panel 9, the two first intake pipes 5 and the two second intake pipes 10 will form a structure similar to a cross.

[0050] In this embodiment, through the arrangement of the first intake pipe 5 and the second intake pipe 10, it is more convenient to introduce the fuel agent and the oxidant into this device. Among them, through the arrangement of the two first intake pipes 5 and the two second intake pipes 10, the intake amounts of the fuel agent and the oxidant can be increased.

[0051] According to an embodiment of the present invention, referring to Figure 4 and Figure 6 , the numbers of the first injection annular groove 6 and the second injection annular groove 11 are both several. Among them, several first injection annular grooves 6 are interconnected through the first communication hole 7, and several second injection annular grooves 11 are interconnected through the second communication hole 12.

[0052] In this embodiment, referring to Figure 4, the number of the first injection annular grooves 6 can be two, and one of the first injection annular grooves 6 is a larger annular structure, and the other first injection annular groove 6 is a smaller annular structure. At the same time, the two first injection annular grooves 6 are coaxially arranged.

[0053] In this embodiment, referring to Figure 6 , the number of the second injection annular grooves 11 can also be two, and one of the second injection annular grooves 11 is a larger annular structure, and the other second injection annular groove 11 is a smaller annular structure. At the same time, the two second injection annular grooves 11 are coaxially arranged.

[0054] In this embodiment, referring to Figure 6 , since the first injection annular groove 6 is communicated with the first injection pipe 8 and the second injection annular groove 11 is communicated with the second injection pipe 13, therefore, the two first injection annular grooves 6 and the two second injection annular grooves 11 can be arranged in a nested structure. For example, as Figure 6 shown, the larger second injection annular groove 11, the larger first injection annular groove 6, the smaller second injection annular groove 11, and the smaller first injection annular groove 6 can be sequentially arranged from the outside to the inside of the second injection panel 9. Among them, as Figure 6 shown, since the first injection pipe 8 and the second injection pipe 13 are staggeredly arranged, therefore, when the second communication hole 12 can communicate the two second injection annular grooves 11, it will not be communicated with the first injection annular groove 6.

[0055] In this embodiment, referring to Figure 5 , the number of the second injection pipes 13 in the larger circle can be 24, and the number of the second injection pipes 13 in the smaller circle can be 12; the number of the first injection pipes 8 in the larger circle can be 18, and the number of the first injection pipes 8 in the smaller circle can be 6.

[0056] In addition, in this embodiment, referring to Figure 5 and Figure 6 , a separate second injection pipe 13 can also be installed at the center position of the second injection panel 9, that is, at this time, the first injection pipe 8 and the second injection pipe 13 form a total of five layers (five circles) of structure on the second injection panel 9, that is, the staggered arrangement method in the above content is formed.

[0057] Furthermore, a high-temperature resistant sealing layer (not shown in the figure) is provided between the first injection panel 4 and the second injection panel 9.

[0058] Specifically, referring to Figure 6, a high-temperature resistant sealing layer can be arranged between the first injection annular groove 6 and the second injection annular groove 11, and also at the edge of the outermost second injection annular groove 11, thereby improving the isolation between the first injection annular groove 6 and the second injection annular groove 11, and also improving the overall sealing performance of the injection mechanism. Among them, the material of the high-temperature resistant sealing layer can be any material known in the art that is high-temperature resistant and can play a sealing role, such as fluororubber or silicone rubber, etc., which is not particularly limited herein.

[0059] According to an embodiment of the present invention, referring to Figure 1 , Figure 9 and Figure 10 , a bottom end of the first straight pipe 15 is installed and communicated with a connection housing 14, a bottom end of the connection housing 14 is connected to the second injection panel 9, and air outlet ends (i.e., Figure 5 the top ends of the first injection pipe 8 and the second injection pipe 13 in

[0060] In this embodiment, referring to Figure 9 , the whole of the connection housing 14 can be a hollow and cylindrical structure, and its top is a conical structure.

[0061] In this embodiment, referring to Figure 10 , an outer diameter of a bottom end of the connection housing 14 can be the same as a diameter of the second injection panel 9, and the connection housing 14 can also be connected to the second injection panel 9 by bolts. At this time, the air outlet ends of the first injection pipe 8 and the second injection pipe 13 will be located inside the connection housing 14, thereby realizing the communication between the air outlet ends of the first injection pipe 8 and the second injection pipe 13 and the connection housing 14.

[0062] In this embodiment, referring to Figure 9 and Figure 11 , flanges are arranged at both a bottom end of the first straight pipe 15 and a top end of the connection housing 14, so that the two can be connected by the flanges.

[0063] In addition, the above-mentioned high-temperature resistant sealing layer can also be arranged between the connection housing 14 and the first straight pipe 15, and between the connection housing 14 and the second injection panel 9, thereby improving the sealing performance of the device, which will not be elaborated here.

[0064] According to an embodiment of the present invention, referring to Figures 12 - 14 , the flow stabilizing mechanism includes a flow stabilizing housing 16. Referring to Figure 11, the top end of the first straight pipe 15 is coaxially installed and communicated with a second straight pipe 19. The cross-sectional diameter of the second straight pipe 19 is smaller than that of the first straight pipe 15. An installation hole 20 is provided at the bottom end of the flow stabilizing housing 16. The second straight pipe 19 is arranged to be inserted into the flow stabilizing housing 16 through the installation hole 20 and abuts against the inner wall of the installation hole 20.

[0065] In this embodiment, both the flow stabilizing housing 16 and the second straight pipe 19 can be hollow and cylindrical structures. Refer to Figure 11 , the second straight pipe 19 will form a stepped structure with the first straight pipe 15. When the first straight pipe 15 is connected to the flow stabilizing housing 16, the top end of the first straight pipe 15 will abut against the bottom end of the flow stabilizing housing 16. Preferably, the top end of the second straight pipe 19 is flush with the top end of the flow equalizing plate 18 (not shown in the figure).

[0066] In this embodiment, the above-mentioned high-temperature resistant sealing layer can also be provided between the inner wall of the installation hole 20 and the outer wall of the second straight pipe 19, and the first straight pipe 15 and the flow stabilizing housing 16 can also be connected by bolts, which will not be elaborated here.

[0067] Refer to Figure 12 and Figure 14 , the top end of the flow stabilizing housing 16 is an open structure and is installed with a flow equalizing plate 18. A flow equalizing plate central through hole 21 is provided at the central position of the flow equalizing plate 18. The inner wall of the flow equalizing plate central through hole 21 abuts against the outer wall of the second straight pipe 19, that is, after the second straight pipe 19 is inserted into the flow stabilizing housing 16, the outer side wall of the second straight pipe 19 will also abut against the inner wall of the flow equalizing plate central through hole 21.

[0068] In this embodiment, the installation manner between the flow stabilizing housing 16 and the flow equalizing plate 18 can also be connected by bolts, which will not be elaborated here. Among them, the specific structure of the flow equalizing plate 18 can refer to Figure 14 , and a number of small holes (i.e., flow equalizing holes) can be filled and arrayed thereon, thereby realizing the flow equalizing effect of the inert gas.

[0069] In this embodiment, the material of the flow equalizing plate 18 can be a sintered copper sheet known in the art, and no special limitation is made here.

[0070] In this embodiment, refer to Figure 14 , the flow equalizing plate 18 can be a three-layer structure.

[0071] According to an embodiment of the present invention, refer to Figure 14 , a third intake pipe 17 is installed and communicated on the side wall of the flow stabilizing housing 16. The third intake pipe 17 is used to introduce a flow stabilizing agent. It can be seen from this that the third intake pipe 17 is not communicated with the second straight pipe 19.

[0072] In this embodiment, the number of the third intake pipes 17 can be two, and they are symmetrically arranged on the side wall of the steady flow housing 16 in sequence.

[0073] In this embodiment, since the inner wall of the central through hole 21 of the flow equalizing plate also abuts against the outer wall of the second straight pipe 19, the second straight pipe 19 is not connected to the inside of the steady flow housing 16, that is, the third intake pipe 17 is not connected to the second straight pipe 19.

[0074] When performing the laminar combustion test, the combustion agent (the above-mentioned methane gas) in the second straight pipe 19 can be ignited at the top end of the second straight pipe 19 (i.e., at the position flush with the top end of the flow equalizing plate 18), and at the same time, the steady flow agent is introduced into the third intake pipe 17. At this time, the steady flow agent (the above-mentioned nitrogen gas) introduced into the third intake pipe 17 will be blown out from the flow equalizing plate 18 after being equalized by the flow equalizing plate 18, and will form a gas layer (i.e., a structure similar to a wind wall) around the flame burning at the top end of the second straight pipe 19. Thus, the spatial airflow can be blocked, and further, the spatial airflow can be effectively prevented from interfering with the flow field near the flame, which is beneficial to observing the combustion phenomenon. Among them, the method of igniting the combustion agent in the second straight pipe 19 is not particularly limited, and it can be ignited by any known ignition method applicable to laminar combustion in the art.

[0075] According to an embodiment of the present invention, referring to Figure 1 and Figure 2 , a support mechanism is provided below the first injection panel 4. The support mechanism includes a support platform 1 and a plurality of support legs 2. The support legs 2 are installed at the bottom end of the support platform 1, and the top end of the support platform 1 is used to place the first injection panel 4.

[0076] In this embodiment, the support platform 1 can be a flat cuboid structure, and the number of the support legs 2 can be four, and they are sequentially bolted to the four corners at the bottom end of the support platform 1.

[0077] In this embodiment, the support platform 1 is preferably arranged horizontally, that is, the lengths of the four support legs 2 should be equal.

[0078] In this embodiment, the support legs 2 can be fixed to the ground by a known fixing method using anchor bolts in the art.

[0079] In this embodiment, the bottom end of the first injection panel 4 can also be connected to the top end of the support platform 1 by means of bolt connection.

[0080] In an embodiment of the present invention, through the arrangement of the support platform 1 and the support legs 2, the device can be placed and supported.

[0081] Furthermore, referring to Figure 2, the support mechanism further includes a placement table 3, and the placement table 3 is installed on the support legs 2, preferably at the middle position of the support legs 2.

[0082] In this embodiment, the placement table 3 can also be a flat cuboid structure, and it can be connected to the side wall of the support leg 2 by bolts. Preferably, the placement table 3 is arranged parallel to the support table 1.

[0083] In this embodiment, through the arrangement of the placement table 3, temporary items required in the laminar combustion test can be placed on the placement table 3, improving convenience.

[0084] In the second aspect of the present invention, an installation method of a premixed gas laminar combustion device is provided, which at least includes the following steps: S1. Install the flow stabilizing mechanism at the top of the first straight pipe 15.

[0085] In step S1, specifically, first, stack the three-layer uniform flow plates 18 and ensure that the uniform flow holes in the three-layer uniform flow plates 18 are in a connected state. After stacking, install the three-layer uniform flow plates 18 at the top of the inner side wall of the flow stabilizing housing 16 by bolts. Then, install the two third intake pipes 17 on the side wall of the flow stabilizing housing 16 and make the third intake pipes 17 communicate with the inside of the flow stabilizing housing 16. Finally, insert the second straight pipe 19 into the inside of the flow stabilizing housing 16 through the installation hole 20, and the two can also be connected by bolts, thereby installing the flow stabilizing mechanism at the top of the first straight pipe 15.

[0086] S2. Install a plurality of first injection pipes 8 and a plurality of second injection pipes 13 at the top of the second injection panel 9 in a staggered arrangement.

[0087] In step S2, specifically, first, threadedly install 24 second injection pipes 13 evenly in a circular manner at the top of the second injection panel 9 to form the first circle from the outside to the inside. Then, threadedly install 18 first injection pipes 8 evenly in a circular manner at the top of the second injection panel 9 to form the second circle from the outside to the inside. Then, threadedly install 12 second injection pipes 13 evenly in a circular manner at the top of the second injection panel 9 to form the third circle from the outside to the inside. Then, threadedly install 6 first injection pipes 8 evenly in a circular manner at the top of the second injection panel 9 to form the fourth circle from the outside to the inside. Finally, threadedly install one second injection pipe 13 at the center of the top of the second injection panel 9, thereby completing the installation between the first injection pipe 8, the second injection pipe 13 and the second injection panel 9 (for the specific structure after installation, refer to Figure 5 )

[0088] After completing the above, bolt-mount the first injection panel 4 at the bottom end of the second injection panel 9, and respectively mount two first intake pipes 5 and two second intake pipes 10 on the side walls of the first injection panel 4 and the second injection panel 9.

[0089] S3. Mount the injection mechanism at the bottom end of the first straight pipe 15, such that the gas outlet ends of the first injection pipe 8 and the second injection pipe 13 are both in communication with the bottom end of the first straight pipe 15.

[0090] In step S3, specifically, first mount the connection housing 14 at the bottom end of the first straight pipe 15 by means of flange connection, and then bolt-mount the second injection panel 9 and the first injection panel 4 assembled in step S2 at the bottom end of the connection housing 14. At this time, the gas outlet ends (i.e., the top ends of the first injection pipe 8 and the second injection pipe 13) of the first injection pipe 8 and the second injection pipe 13 will be located inside the bottom end of the connection housing 14, thereby realizing the communication between the gas outlet ends of the first injection pipe 8 and the second injection pipe 13 and the bottom end of the first straight pipe 15.

[0091] S4. Introduce the fuel and the oxidant into the intake ends of the first injection pipe 8 and the second injection pipe 13 respectively.

[0092] In step S4, specifically, a pipe (not shown in the figure) capable of introducing the fuel can be connected to the first intake pipe 5, and then a pipe (not shown in the figure) capable of introducing the oxidant can be connected to the second injection pipe 13, thereby realizing the introduction of the fuel and the oxidant.

[0093] S5. Introduce the flow stabilizer into the flow stabilizing mechanism.

[0094] In step S5, specifically, a pipe (not shown in the figure) capable of introducing the flow stabilizer can be connected to the third intake pipe 17, thereby realizing the introduction of the flow stabilizer.

[0095] The test process of the present device will be briefly described below in combination with the above embodiments: First, after the installation of the present device is completed, a fuel flowmeter, a fuel pressure transmitter, a fuel pressure reducing valve, a fuel solenoid valve, a fuel manual shut-off valve, and a fuel storage gas cylinder (not shown in the figure and all known in the art) are sequentially mounted on the first intake pipe 5.

[0096] Then, an oxidant flowmeter, an oxidant pressure transmitter, an oxidant pressure reducing valve, an oxidant solenoid valve, an oxidant manual shut-off valve, and an oxidant storage gas cylinder (not shown in the figure and all known in the art) are sequentially mounted on the second intake pipe 10.

[0097] Then, a flow stabilizer flowmeter, a flow stabilizer pressure transmitter, a flow stabilizer pressure reducing valve, a flow stabilizer solenoid valve, a flow stabilizer manual shut-off valve, and a flow stabilizer storage gas cylinder (not shown in the figure and all known in the art) are sequentially installed on the third intake pipe 17.

[0098] Next, the laminar combustion test can be carried out, which can be roughly divided into the following steps: Step 1: Open the oxidant manual shut-off valve, the fuel agent manual shut-off valve, and the flow stabilizer manual shut-off valve.

[0099] Step 2: Open the oxidant solenoid valve and the fuel agent solenoid valve.

[0100] Step 3: According to the theoretical calculation results, sequentially adjust the opening degrees of the oxidant pressure reducing valve and the fuel agent pressure reducing valve, and at the same time observe the values of the oxidant flowmeter and the fuel agent flowmeter until the theoretical calculation results are reached.

[0101] Step 4: Ignite the mixed gas composed of the oxidant and the fuel agent at the top of the second straight pipe 19, and observe the combustion phenomenon.

[0102] Step 5: Open the flow stabilizer solenoid valve.

[0103] Step 6: Adjust the flow stabilizer pressure reducing valve, and until the flow field near the flame is uniform and the combustion is stable, observe the combustion phenomenon again, thereby completing the laminar combustion test.

[0104] Finally, after the test is completed, first close the fuel agent solenoid valve, secondly close the oxidant solenoid valve, and finally close the flow stabilizer solenoid valve to stop all gases from entering the device. After the temperature of the device drops to normal temperature, cut off all power supplies to completely complete the laminar combustion test.

[0105] The above embodiments of the present invention can be combined with each other and have corresponding technical effects.

[0106] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A premixed gas laminar combustion device, characterized in that, It includes a jetting mechanism, a first straight pipe (15) and a flow stabilizing mechanism, where: The jetting mechanism and the flow stabilizing mechanism are respectively installed and communicated with the bottom end of the first straight pipe (15) and the top end of the first straight pipe (15). The flow stabilizing mechanism is configured to be able to introduce a flow stabilizing agent to stabilize the flow field near the flame. The length of the first straight pipe (15) is 50 cm - 70 cm. The jetting mechanism at least includes a second jetting panel (9). A number of first jetting pipes (8) and a number of second jetting pipes (13) are installed at the top end of the second jetting panel (9) in a staggered arrangement. And the first jetting pipes (8) and the second jetting pipes (13) are independently arranged. The air outlet ends of the first jetting pipes (8) and the second jetting pipes (13) are both communicated with the bottom end of the first straight pipe (15). The air inlet ends of the first jetting pipes (8) and the second jetting pipes (13) are respectively used for introducing a fuel and an oxidant.

2. The premixed gas laminar combustion device according to claim 1, characterized in that, The jetting mechanism further includes a first jetting panel (4). The second jetting panel (9) is detachably installed at the top end of the first jetting panel (4). A second jetting annular groove (11) communicating with the air inlet end of the second jetting pipe (13) is formed at the bottom end of the second jetting panel (9). A second communication hole (12) communicating with the second jetting annular groove (11) is formed on the second jetting panel (9). A first jetting annular groove (6) is formed at the top end of the first jetting panel (4). When the second jetting panel (9) is installed at the top end of the first jetting panel (4), the first jetting annular groove (6) is communicated with the air inlet end of the first jetting pipe (8), and the first jetting annular groove (6) is independently arranged from the second jetting annular groove (11). A first communication hole (7) communicating with the first jetting annular groove (6) is formed on the first jetting panel (4). The first communication hole (7) and the second communication hole (12) are respectively used for introducing a fuel and an oxidant.

3. The premixed gas laminar combustion device according to claim 2, wherein, A first air inlet pipe (5) and a second air inlet pipe (10) are respectively installed on the first jetting panel (4) and the second jetting panel (9). The first air inlet pipe (5) and the second air inlet pipe (10) are respectively communicated with the first communication hole (7) and the second communication hole (12). The first air inlet pipe (5) and the second air inlet pipe (10) are respectively used for introducing a fuel and an oxidant.

4. The premixed gas laminar combustion device according to claim 2, characterized in that, The number of the first jetting annular grooves (6) and the second jetting annular grooves (11) is several. A number of the first jetting annular grooves (6) are communicated with each other through the first communication hole (7). A number of the second jetting annular grooves (11) are communicated with each other through the second communication hole (12).

5. The premixed gas laminar combustion device according to claim 2, characterized in that, A high-temperature resistant sealing layer is provided between the first jetting panel (4) and the second jetting panel (9).

6. The premixed gas laminar combustion device according to claim 2, characterized in that, The bottom end of the first straight pipe (15) is installed and communicated with a connecting housing (14). The bottom end of the connecting housing (14) is connected to the second injection panel (9). The air outlet ends of the first injection pipe (8) and the second injection pipe (13) are both communicated with the bottom end of the connecting housing (14).

7. The premixed gas laminar combustion device according to claim 1, characterized in that, The flow stabilizing mechanism includes a flow stabilizing housing (16). The top end of the first straight pipe (15) is coaxially installed and communicated with a second straight pipe (19). The cross-sectional diameter of the second straight pipe (19) is smaller than that of the first straight pipe (15). An installation hole (20) is formed at the bottom end of the flow stabilizing housing (16). The second straight pipe (19) is arranged to be inserted into the flow stabilizing housing (16) through the installation hole (20) and abut against the inner wall of the installation hole (20). The top end of the flow stabilizing housing (16) is of an open structure and is provided with a flow equalizing plate (18). A flow equalizing plate central through hole (21) is formed at the central position of the flow equalizing plate (18). The inner wall of the flow equalizing plate central through hole (21) abuts against the outer wall of the second straight pipe (19). A third intake pipe (17) is installed and communicated with the side wall of the flow stabilizing housing (16). The third intake pipe (17) is used for introducing a flow stabilizing agent.

8. The premixed gas laminar combustion device according to claim 7, characterized in that, The top end of the second straight pipe (19) is flush with the top end of the flow equalizing plate (18).

9. The premixed gas laminar combustion device according to claim 2, characterized in that, A support mechanism is arranged below the first injection panel (4). The support mechanism at least includes a support platform (1) and a plurality of support legs (2). The support legs (2) are installed at the bottom end of the support platform (1). The top end of the support platform (1) is used for placing the first injection panel (4). The support mechanism further includes a placement platform (3). The placement platform (3) is installed on the support legs (2).

10. The installation method of the premixed gas laminar combustion device according to any one of claims 1-9, characterized in that, Comprising the following steps: S1. Install the flow stabilizing mechanism at the top end of the first straight pipe (15). S2. Install a plurality of first injection pipes (8) and a plurality of second injection pipes (13) at the top end of the second injection panel (9) in a staggered arrangement. S3. Install the injection mechanism at the bottom end of the first straight pipe (15) so that the air outlet ends of the first injection pipe (8) and the second injection pipe (13) are both communicated with the bottom end of the first straight pipe (15).

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