Flame combustion radiation intensification measurement experiment device

Abstract

The invention discloses a flame combustion radiation intensification measurement experimental device, and belongs to the technical field of combustion radiation, the flame combustion radiation intensification measurement experimental device comprises a device body, a mixed gas cavity is arranged in the device body, nine central pipes are fixedly connected to the bottom of the mixed gas cavity in a penetrating manner, and a combustion disc filter element is arranged at the top of the device body; nine through holes which are communicated with the center pipe and correspond to the center pipe in position are formed in the combustion disc filter element, an oil bath inlet and an oil bath outlet are formed in one side of the device body, an oil bath channel communicated with the oil bath inlet and the oil bath outlet is formed in the device body, and a protective gas area is arranged in the device body. According to the invention, a structure of combining premixed clean fuel main flame and multi-point soot fuel injection is adopted, especially the design that nine independent controllable central pipes surround the main flame is adopted, so that the uniformity and adjustability of soot addition are ensured, and the soot generation amount and spatial distribution can be flexibly controlled by multi-point injection; and the customizability of the flame radiation intensity is innovatively realized.

Description

Technical Field

[0001] The invention belongs to the technical field of combustion radiation, and in particular relates to a flame combustion radiation intensification measurement experimental device. Background Art

[0002] In the field of combustion, soot particles in flames are the primary contributors to radiative heat transfer. Soot-rich hydrocarbon fuel flames are typically bright and radiate strongly, while flames of clean fuels such as alcohols produce almost no visible light and emit weak radiation. This significant difference in soot generation propensity has inspired the idea of ​​regulating flame radiation by mixing different fuels. Previous studies have shown that adding small amounts of high-soot precursors such as benzene and toluene to low-soot fuels such as methanol, hydrogen, and ammonia can significantly increase the flame's luminosity and radiation ratio. This method not only makes the originally non-luminous alcohol flame visible, making it easier to identify and safely control, but more importantly, it can improve the efficiency of radiative heat transfer, which has potential value in industry. For example, a safety manual points out that the low radiation of methanol flames leads to slow flame spread, while adding other fuels can increase radiative heat output.

[0003] However, in traditional technologies, it is difficult to achieve quantitative research on the effect of fuel blending on radiation enhancement. Conventional combustion experimental devices either use a single high-carbon fuel flame to obtain high radiation, but cannot reflect the characteristics of clean fuel; or use a premixed clean fuel flame to obtain stable combustion, but the soot concentration is extremely low, resulting in weak radiation. There is a lack of a flexible platform that can adjust the amount of soot generated in the same device to observe the changes in radiation heat transfer. At the same time, existing technologies usually use independent radiometers, thermocouples and other single measurement methods for flame thermal radiation measurement, which makes it difficult to simultaneously obtain comprehensive data on flame temperature field, radiation intensity and flue gas particle concentration. This lack of data limits the optimization design of dual-fuel coupled burners and the in-depth evaluation of energy conservation and emission reduction effects during the combustion process.

[0004] In summary, the existing technology lacks a measurement device specifically designed for flame combustion radiation enhancement. This device can enhance flame radiation by actively controlling soot generation while maintaining the clean combustion of green fuels, while also simultaneously measuring key temperature, thermal radiation, and soot distribution parameters. After analyzing these background requirements, the present invention proposes an innovative solution. Summary of the Invention

[0005] The purpose of the present invention is to provide a flame combustion radiation intensification measurement experimental device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: comprising a device body, wherein a mixed gas chamber is provided within the device body, nine central tubes are fixedly connected to the bottom of the mixed gas chamber, a combustion disk filter is provided on the top of the device body, a flame area is located above the combustion disk filter, nine through holes are provided on the combustion disk filter that are connected to the central tube and have corresponding positions, an oil bath inlet and an oil bath outlet are provided on one side of the device body, an oil bath channel connected to the oil bath inlet and the oil bath outlet is provided within the device body, a protective gas area is provided within the device body, a protective gas filter is provided within the protective gas area, and a protective gas inlet is fixedly connected to one side of the device body;

[0007] As a further preferred embodiment of the present technical solution: the device body is a burner with a cylindrical multi-layer structure;

[0008] As a further preferred embodiment of this technical solution: the combustion disk filter element is made of copper;

[0009] As a further preferred embodiment of the present technical solution: the nine central tubes are symmetrically arranged around the center, and the top of the central tube is horizontal to the top of the device body;

[0010] As a further preferred embodiment of the present technical solution: a concentric multi-ring cavity is provided in the device body, the mixed gas cavity is located in the center of the concentric multi-ring cavity, and the protective gas area is located on the periphery of the mixed gas cavity;

[0011] As a further preferred embodiment of the present technical solution: the oil bath channel is located between the periphery of the mixed gas chamber and the inner wall of the device body;

[0012] As a further preferred embodiment of the present invention: a serpentine channel is provided inside the combustion disc filter element and is connected to the oil bath inlet and the oil bath outlet;

[0013] As a further preferred embodiment of the present technical solution: the protective gas filter element surrounds the combustion disk filter element;

[0014] As a further preferred embodiment of the present technical solution: the nine central tubes are grouped into three and are distributed in a trapezoidal shape.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention adopts a structure that combines a premixed clean fuel main flame with multi-point soot fuel injection. In particular, the design of nine independently controllable central tubes surrounding the main flame ensures the uniformity and adjustability of soot addition. Multi-point injection allows for flexible control of soot generation and spatial distribution, innovatively achieving customizable flame radiation intensity.

[0017] 2. The present invention combines a copper combustion disc filter with a through hole and an oil bath temperature control channel in the burner. The combustion disc filter is regulated to hot and cold by a built-in oil bath circuit, achieving rapid preheating before combustion and efficient cooling during combustion, ensuring combustion stability and providing a constant temperature boundary condition to facilitate experimental repeatability, a function lacking in general burners.

[0018] 3. The present invention achieves dynamic regulation of flame soot generation by independently controlling the nine-way soot precursor fuel supply. The fuel flow rate of each nozzle can be changed in real time, thereby quickly responding to the flame state under different soot concentrations. This refined fuel control method provides a new experimental means for studying the soot-radiation relationship and optimizing dual-fuel combustion strategies.

[0019] 4. The present invention introduces a "radiation relay" mechanism, which constructs a multi-level soot concentration gradient by programmably controlling the opening mode and parameters of the nine nozzles, so that a "primary absorption-secondary re-radiation" spatial energy distribution effect is generated inside the flame, thereby significantly improving the overall radiation heat flux while ensuring that soot emissions do not increase significantly, and extending the radiation path length and efficiency through orderly regulation of soot. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a flame combustion radiation enhancement measurement experimental device of the present invention. Figure 1 ;

[0021] Figure 2 This is a cross-sectional view of a flame combustion radiation enhancement measurement experimental device according to the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of a flame combustion radiation enhancement measurement experimental device of the present invention. Figure 2 ;

[0023] Figure 4 This is a top view of a flame combustion radiation intensification measurement experimental device of the present invention.

[0024] Legend: 1. Device body; 2. Mixed gas chamber; 3. Center tube; 4. Flame area; 5. Shielding gas area; 6. Oil bath channel; 7. Oil bath inlet; 8. Oil bath outlet; 9. Combustion disk filter element; 10. Shielding gas filter element; 11. Through hole; 12. Shielding gas inlet. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example

[0027] See also Figure 1-Figure 4 As shown, the present invention provides a technical solution: it includes a device body 1, a mixed gas chamber 2 is provided in the device body 1, and nine central tubes 3 are fixedly connected to the bottom of the mixed gas chamber 2, a small amount of soot generating precursor fuel is introduced into each central tube 3 through an independent supply system, and the flow rate of each central tube 3 can be adjusted separately, so as to introduce soot into different areas of the flame, a combustion disc filter 9 is provided on the top of the device body 1, and the flame area 4 is above the combustion disc filter 9, and nine through holes 11 are provided on the combustion disc filter 9, which are connected to the central tube 3 and have corresponding positions. The through holes 11 are evenly distributed to ensure the symmetry and uniformity of soot addition, an oil bath inlet 7 and an oil bath outlet 8 are provided on one side of the device body 1, an oil bath channel 6 connected to the oil bath inlet 7 and the oil bath outlet 8 is provided in the device body 1, a protective gas area 5 is provided in the device body 1, a protective gas filter 10 is provided in the protective gas area 5, and a protective gas inlet 12 is fixedly connected to one side of the device body 1;

[0028] In this embodiment, specifically: the device body 1 is a cylindrical multi-layer burner, and the mixed gas chamber 2 is composed of premixed green fuel and combustion air to form a stable flame;

[0029] In this embodiment, specifically: the material of the combustion disk filter 9 is copper, the main flame burns evenly through the combustion disk filter 9, and the surface of the combustion disk filter 9 is regarded as the flame outlet surface;

[0030] In this embodiment, specifically: the nine central tubes 3 are symmetrically arranged around the center, and the top of the central tube 3 is horizontal to the top of the device body 1. By coordinating the supply of the nine central tubes 3, a continuously adjustable transition from low-carbon smoke clean combustion to high-carbon smoke strong radiation combustion can be achieved;

[0031] In this embodiment, specifically: a concentric multi-ring cavity is provided in the device body 1, a mixed gas cavity 2 is located in the center of the concentric multi-ring cavity, and a protective gas area 5 is located on the periphery of the mixed gas cavity 2. The premixed methanol fuel and air enter the upper combustion disk filter element 9 through the mixed gas cavity 2 and ignite to form a main flame;

[0032] In this embodiment, specifically: the oil bath channel 6 is located between the periphery of the mixed gas chamber 2 and the inner wall of the device body 1, and the protective gas inlet 12, the oil bath inlet 7, and the oil bath outlet 8 are used to supply protective gas and circulating oil;

[0033] In this embodiment, specifically: a serpentine channel is opened inside the combustion disk filter element 9 and is connected to the oil bath inlet 7 and the oil bath outlet 8;

[0034] In this embodiment, specifically: the protective gas filter element 10 surrounds the combustion disk filter element 9 and is used to pass inert gas or special protective gas. The protective gas is evenly ejected around the main flame through the annular protective gas filter element 10, forming an air curtain to isolate the main flame from interference from external air or cold air, stabilize the flame and prevent the flame from being quenched externally;

[0035] In this embodiment, specifically, the nine central tubes 3 are grouped into three and are distributed in a trapezoidal shape.

[0036] Working principle or structural principle: During the experiment, heat transfer oil can be passed into the oil bath channel 6 to form an oil bath: the heated hot oil passed before combustion can preheat the copper combustion disk filter element 9 to the required temperature, helping the methanol / air mixture to ignite smoothly; the cooling oil-water mixture is passed into the combustion process to take away the heat, stabilize the combustion disk temperature and prevent the structure from overheating and damage. Nine central tubes 3 pass through the mixed gas chamber 2 directly to the surface of the combustion disk. There are nine through holes 11 at the corresponding positions on the top surface of the combustion disk filter. The fuel in each through hole 11 is injected into the main flame area 4 from the corresponding small hole, and reacts with the flame to generate carbon soot. Through this structural layout, the carbon soot precursor can directly enter the core area of ​​the flame and fully participate in the combustion reaction. The center is the mixed gas chamber 2, surrounded by protective airflow, and the periphery is the structural cooling and support part. This layout ensures the thermal insulation of the flame area, reduces the influence of the external environment on the measurement, and facilitates the arrangement of multiple nozzles to achieve carbon soot control.

[0037] By independently regulating the nine central tubes 3 hole by hole, a radial or angular gradient of soot concentration distribution is formed on the flame outlet surface. In the high-concentration soot area, short-wave ultraviolet-infrared radiation is first absorbed and heated up. Its surface then radiates heat to the surrounding low-concentration area in the form of medium- and long-wave radiation, thus forming a chain reaction path of "re-radiation-reabsorption" inside the flame. This path can realize the visual control and dynamic reconfiguration of the radiation hotspot area by continuously adjusting the flow rate, fuel composition, injection cycle frequency and other parameters of each nozzle. The control strategy includes various forms For example, in the "radial gradient mode", the three central nozzles are closed and only the six outer nozzles are opened to form a "high outside and low inside" soot distribution; in the "annular focusing mode", only the three or six nozzles in the middle circle are opened to create a "high in the middle and low on the sides" structure; in the "directional enhancement mode", the flow rate is increased in the clockwise arranged nozzles 1-3-5 in sequence to create a fan-shaped high radiation area pointing to the side wall. Preliminary numerical simulations show that under the typical "annular focusing" configuration, the radiation heat flux density of the flame to the side wall can be increased by 28% to 35% compared with the uniform injection condition, while the overall flame equivalence ratio only increases by 1.5% to 2%.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations that come within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A flame combustion radiation intensification measurement experimental device, characterized by: The invention comprises a device body (1), wherein a mixed gas chamber (2) is provided in the device body (1), nine central tubes (3) are fixedly connected to the bottom of the mixed gas chamber (2), a combustion disc filter (9) is provided on the top of the device body (1), a flame area (4) is located above the combustion disc filter (9), nine through holes (11) are provided on the combustion disc filter (9) and are connected to the central tube (3) and have corresponding positions, an oil bath inlet (7) and an oil bath outlet (8) are provided on one side of the device body (1), an oil bath channel (6) connected to the oil bath inlet (7) and the oil bath outlet (8) is provided in the device body (1), a protective gas area (5) is provided in the device body (1), a protective gas filter (10) is provided in the protective gas area (5), and a protective gas inlet (12) is fixedly connected to one side of the device body (1).

2. The flame combustion radiation intensification measurement experimental device according to claim 1, characterized in that: The device body (1) is a burner with a cylindrical multi-layer structure.

3. The flame combustion radiation intensification measurement experimental device according to claim 2, characterized in that: The combustion disc filter element (9) is made of copper.

4. The flame combustion radiation intensification measurement experimental device according to claim 3, characterized in that: The nine central tubes (3) are symmetrical parts surrounding the center, and the top of the central tube (3) is horizontal to the top of the device body (1).

5. The flame combustion radiation intensification measurement experimental device according to claim 4, characterized in that: A concentric multi-ring cavity is provided in the device body (1), the mixed gas cavity (2) is located at the center of the concentric multi-ring cavity, and the protective gas area (5) is located at the periphery of the mixed gas cavity (2).

6. The flame combustion radiation intensification measurement experimental device according to claim 5, characterized in that: The oil bath channel (6) is located between the periphery of the mixed gas chamber (2) and the inner wall of the device body (1).

7. The flame combustion radiation intensification measurement experimental device according to claim 6, characterized in that: A serpentine channel is provided inside the combustion disc filter element (9) and is connected to the oil bath inlet (7) and the oil bath outlet (8).

8. The flame combustion radiation intensification measurement experimental device according to claim 7, characterized in that: The protective gas filter element (10) surrounds the combustion disk filter element (9).

9. The flame combustion radiation intensification measurement experimental device according to claim 8, characterized in that: The nine central tubes (3) are arranged in groups of three and are arranged in a trapezoidal shape.

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