An integrated local dilution precisely adjustable pollutant control diffusion burner

Abstract

The present application relates to a kind of integrated local dilution precision adjustable pollutant control diffusion burner, the device adopts annular coaxial layout, and is configured in turn from inside to outside one scalable diluent injection local control pipeline, burner inner tube, burner secondary outer tube, burner outer tube.Integrated local dilution precision adjustable pollutant control diffusion burner is used to fix while providing stable laminar flame to one scalable diluent injection local control pipeline, so that trace diluent is injected into the local area in flame by control pipeline.Injection height of diluent can be accurately adjusted when local control pipeline works, and the type of diluent passed into local control pipeline can be selected.Carbon smoke concentration produced by flame changes obviously before and after injection, and the present application can explore the influence of different flow and different types of diluent injected in different local areas in flame on combustion pollutant particles.

Description

Technical Field

[0001] This invention relates to the field of burners, and in particular to an integrated, locally diluted, precisely adjustable pollutant control and diffusion burner. Background Technology

[0002] Today, human quality of life and industrial production are inseparable from energy utilization. However, most energy and power come from the combustion of hydrocarbon fuels. Besides the depletion of fossil fuels and safety concerns, the combustion of hydrocarbon fuels inevitably produces pollutants, posing a serious risk to global warming and human health. Among these, soot, a major pollutant, refers to inhalable particulate matter produced by incomplete combustion; its growth process includes both physical polymerization and chemical surface growth.

[0003] After years of research, it has been proven that adding diluents (hydrogen, carbon dioxide, water vapor, nitrogen, etc.) is one of the important methods for effectively controlling soot formation during hydrocarbon combustion. Most domestic and international scholars have explored the effects of adding diluents on combustion performance and pollutant formation by adding them to the fuel or oxidizer side; few scholars have studied the inhibitory effect on particulate matter by injecting diluents into the flame center.

[0004] In a forward diffusion flame burner, the inner layer is the fuel channel, the next outermost layer is the oxidizer channel, and the outermost layer is the protective nitrogen channel. For a reverse diffusion flame burner, the inner layer is the oxidizer channel, the next outermost layer is the fuel channel, and the outermost layer is the protective nitrogen channel. The outermost protective nitrogen channel prevents the oxidizer from permeating from the environment, thus stabilizing the flame. Because the soot in a reverse diffusion flame does not reach the oxidizer side through the flame front and is only slightly oxidized, researchers often use reverse diffusion flame combustion configurations to investigate the formation characteristics of soot at different stages.

[0005] Because the local control pipes are extremely small and the diluent flows from bottom to top, injecting a certain flow rate of diluent into the flame will not significantly alter the flame morphology, thus maintaining flame stability. Furthermore, since soot particles undergo different growth stages in different regions of the flame, and soot particles in diffuse flames do not reach the oxidizer side via the flame reaction front, this device can precisely adjust the injection height of the local control pipes to investigate the effects of different diluents on different soot growth regions.

[0006] In summary, this device ingeniously combines the characteristics of reactive or inert substance regulation with those of diffusion flame burners, enabling integrated and precise control. Although it is currently in the laboratory research stage, it is expected to be fully studied and developed, and will have profound guiding significance for improving fuel combustion efficiency and controlling particulate matter emissions in actual industry. Summary of the Invention

[0007] The purpose of this invention is to provide an integrated, locally diluted, precisely adjustable pollutant control and diffusion burner. It integrates a diffusion flame burner with a local control pipeline, and then uses an intrusive local control pipeline to inject a diluent into a local area inside the flame to achieve the purpose of controlling the combustion pollutant particles.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] An integrated, locally diluted, precisely adjustable pollutant control and diffusion burner, comprising:

[0010] An extremely thin, retractable diluent injection local control pipeline is configured from the inside out, including the burner inner tube, the burner secondary outer tube, and the burner outer tube.

[0011] The local control pipeline is a hollow corundum capillary tube, which has good thermal stability and chemical inertness at high temperatures and is not easily reacted with ions, soot precursors, and polycyclic aromatic hydrocarbons in the flame.

[0012] The diluent injected into the local control pipeline flows from bottom to top and is located on the central axis of the burner, so it is not likely to affect the stability of the flame after injection.

[0013] The burner is fixed to the frame via threaded holes on the flange;

[0014] The burner uses a pair of double-clamping screw reducers to fix the local control pipeline. The umbrella-shaped graphite pad installed inside the fixing device can maintain the airtightness of the connection of the local control pipeline.

[0015] The tightness of the local control pipeline can be adjusted by rotating the rotating screw on the double-clamp reducer. Loosening the local control pipeline allows for precise adjustment of the injection height, thus achieving accurate injection of diluent at different flame heights. This ensures that the diffusion flame burner produces a stable laminar diffusion flame.

[0016] The inner tube, the inner tube inlet, and the double-ferrule swivel reducer for fixing the local control pipeline in the above-mentioned diffuser are connected and fixed by an equal-diameter tee connector, which reduces the use of unnecessary devices while ensuring a tight connection and fixation.

[0017] The double-ferrule screw reducer in the burner is fitted with an umbrella-shaped graphite pad, which is tightly connected to the local control pipeline. The umbrella-shaped graphite pad has excellent mechanical properties, vibration resistance and impact resistance, and can ensure airtightness while moving the height of the local control pipeline.

[0018] The symmetrical double-ferrule screw reducer fixing device in the burner can be connected and fixed to the lower outlet of the equal diameter tee and the diluent pipeline while fixing the local control pipeline. This will isolate the diluent inside the local control pipeline from the oxidizer / fuel inside the burner, preventing them from mixing and achieving the purpose of directly injecting diluent into the flame.

[0019] The significant advantages of this invention over the prior art are:

[0020] 1. The diffuse flame burner and local control pipeline are integrated into a single device, which can be used to explore the control of combustion pollutants in diffuse flames.

[0021] 2. The local control pipeline is extremely small, and the flow direction of the diluent inside it coincides with the flame axis. With a certain flow rate of diluent inside, it can penetrate into the flame and accurately control the emission of combustion particulate matter while stabilizing the flame.

[0022] 3. Compared to traditional diffusion flame burners, the integrated local dilution and precisely adjustable pollutant control diffusion burner designed in this system can not only generate the same diffusion flame as traditional diffusion flame burners, but also inject diluent into the flame interior.

[0023] 4. This pollutant control and diffusion burner can precisely adjust the height of the diluent injected into the flame through the local control pipeline. The effects of injecting different flow rates and types of diluent into different local areas of the flame on the control of combustion pollutant particles were investigated.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Figure 2 This is an isometric view of the present invention.

[0027] Figure 3 and Figure 4 This is a full sectional view.

[0028] Figure 5 for Figure 2 The diagram shows the internal structure of the double ferrule screw reducer.

[0029] Figure 6 This is a diagram illustrating the reverse diffusion flame effect achieved by precisely injecting different flow rates of carbon dioxide diluent into a localized area of ​​the flame at a height of 4 mm under given flame conditions.

[0030] The meanings of the numbers in the attached diagram are as follows:

[0031] 1 is a corundum local control pipeline with an inner diameter of 0.4mm, an outer diameter of 0.8mm, and a length of 550mm; 2 is the burner outer pipe; 3 is the burner secondary outer pipe; 4 is the burner inner pipe; 5 is the inner pipe air inlet; 6A is a 6mm to 1 / 16in double ferrule screw reducer with a vertically upward screw; 6B is a 6mm to 1 / 16in double ferrule screw reducer with a vertically downward screw; 7A and 7B correspond to the rotating screws on double ferrule screw reducers 6A and 6B, respectively; 8 is the diluent pipeline; 9 is the flange; 10 is the outer pipe air inlet; 11 is the secondary outer pipe air inlet; 12 is an equal diameter tee connector; 13 is a fully penetrating M6 threaded hole; 14A and 14B correspond to the umbrella-shaped graphite gaskets with an inner diameter of 0.8mm in double ferrule screw reducers 6A and 6B, respectively. Detailed Implementation

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The present invention is an integrated, locally diluted, precisely adjustable pollutant control and diffusion burner.

[0034] Specifically, it includes:

[0035] Configured sequentially from the inside out

[0036] A retractable controllable conduit 1 for localized injection of diluent, an inner burner tube 4, a secondary outer burner tube 3, and an outer burner tube 2.

[0037] It also includes a pair of double-ferrule screw reducers 6A and 6B for fixing the local control pipeline 1;

[0038] Before fixing the local control line 1 for injecting micro-diluent, the rotating screws 7A and 7B on the double ferrule screw reducer 6A and 6B can be rotated to control the tightness of the fixation, thereby adjusting the diluent injection height in the local control line 1 to achieve the purpose of injecting diluent in different areas of the flame.

[0039] Local control pipeline 1 is a hollow corundum tube with a length of 550mm, an inner diameter of 0.4mm, and an outer diameter of 0.8mm.

[0040] The local control line 1 is located on the axis of the burner. The inlet of the diluent inside is located at the connection between the double ferrule screw reducer 6B and the local control line 1, and the outlet of the diluent inside is above the burner.

[0041] The inner tube 4, the secondary outer tube 3, and the outer tube 2 of the burner have inner diameters of 4mm, 16mm, and 36mm respectively from the inside to the outside, and are all made of 304 stainless steel.

[0042] The burner inner tube 4, located at the bottom of the burner, is connected to the double-ferrule screw reducer 6A and the inner tube inlet 5 via an equal diameter tee connector 12. Due to the small diameter of the local control line 1, the double-ferrule screw reducers 6A and 6B are equipped with umbrella-shaped graphite pads 14A and 14B, which can further prevent the leakage of diluent entering the local control line. This prevents the fuel / oxidant entering from the inner tube inlet 5 from moving downward along the burner axis, and instead causes it to exit the burner outlet through the inner tube 4 in an upward direction along the axis.

[0043] The secondary outer tube 3 of the burner has two radially symmetrical secondary outer tube inlets 11 at its inlet end, with an angle of 180° between adjacent inlets. The outer tube 2 of the burner has two radially symmetrical outer tube inlets 10 at its inlet end, with an angle of 180° between adjacent inlets. Diluent is supplied to the local control pipeline 1 through a diluent pipeline 8 located at the bottom of the burner.

[0044] A flange 9 with a diameter of 200mm is welded around the burner. Four circumferentially symmetrical through M6 threaded holes 13 are opened in the flange 9 to fix the burner on the stand.

[0045] The outer diameter of the pipe connected to the equal diameter tee fitting 12 is 6mm.

[0046] The double ferrule screw reducer 6A and 6B are 6mm to 1 / 16in reducer adapters.

[0047] The double ferrule screw reducer joints 6A and 6B are characterized in that an umbrella-shaped graphite pad 14A and 14B with an inner diameter of 0.8mm is installed inside the double ferrule screw reducer joints 6A and 6B to prevent gas leakage.

[0048] Before use, the components in the first burner, except for the double ferrule screw reducer 6B, are fixed to the stand through the fully penetrating M6 threaded hole 13.

[0049] Insert the 550mm long local control pipe 1 into the burner from top to bottom through the center outlet at the top of the burner. When it extends into the umbrella-shaped graphite pad 14A in the double ferrule screw reducer 6A, rotate the rotating screw 7A in the double ferrule screw reducer 6A to disengage it from the double ferrule screw reducer 6A, thereby stopping the fixation of the umbrella-shaped graphite pad 14A. After the local control pipe 1 has completely penetrated the umbrella-shaped graphite pad 14A for a certain distance, screw the rotating screw 7A back into the double ferrule screw reducer 6A to fix the local control pipe 1 inserted into the double ferrule screw reducer 6A.

[0050] Connect the double ferrule screw reducer 6B to the outlet of the diluent line 8, then unscrew the rotating screw 7B in the double ferrule screw reducer 6B to release it from the fixation of the umbrella-shaped graphite pad 14B in the double ferrule screw reducer 6B, and remove the umbrella-shaped graphite pad 14B.

[0051] Without changing the position of the local control line 1 fixed in the double ferrule screw reducer 6A, first insert the local control line 1 into the rotating screw 7B removed from the double ferrule screw reducer 6B, and then insert the umbrella-shaped graphite pad 14B into the double ferrule screw reducer 6B.

[0052] The rotating screw 7B of the double ferrule screw reducer 6B is screwed into the interior of the double ferrule screw reducer 6B, thus fixing the umbrella-shaped graphite pad 14B inside the double ferrule screw reducer 6B. This fixes the downward-extending local control pipe 1 of the double ferrule screw reducer 6A inside the double ferrule screw reducer 6B. After fixing the local control pipe 1, a portion of the local control pipe 1 is exposed. The diluent enters the local control pipe 1 through the diluent pipe 8 and is then injected into the diffusion flame. During the fixing process, the height at which the diluent is injected into the flame can be precisely adjusted by slowly extending and retracting the local control pipe.

[0053] To investigate the effect of diluent flow rate on the control of particulate matter in a diffused flame at a given injection height, the diluent flow rate can be changed. To investigate the effect of diluent injection in different areas of the flame on the control of particulate matter, the rotating screws 7A and 7B in the double-clamping screw reducer 6A and 6B can be loosened, and the exposed local control pipe 1 can be pressed down and moved up and down slowly along the burner axis to precisely adjust the diluent injection height in the flame. To investigate the effect of different diluents on the control of particulate matter in the flame, the type of diluent injected can be changed.

[0054] Combination Figure 6The figure demonstrates the practical effects of this invention. It shows the effect of different carbon dioxide injection flow rates on the control of combustion particulate matter in the flame at a given injection height of 4 mm. The figure shows that after injecting carbon dioxide into the flame, the brightness of the yellow flame is significantly reduced, indicating a decrease in soot concentration. Furthermore, as the injection flow rate increases, the suppression of soot formation becomes more pronounced without significantly affecting flame stability.

[0055] The above-disclosed applications enable those skilled in the art to implement or use the invention. Various modifications to these specific applications, as defined herein, will be readily apparent to those skilled in the art. The general principles may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated, locally diluted, precisely adjustable pollutant control and diffusion burner, characterized in that, include: From the inside out, a retractable control pipe (1) for local injection of diluent, an inner burner pipe (4), a secondary outer burner pipe (3), and an outer burner pipe (2) are arranged in sequence. It also includes a pair of double-clamping screw reducer connectors 1 (6A) and 2 (6B) for fixing the local control pipe (1). Before fixing the local control pipe (1) for injecting a small amount of diluent, the rotating screws 1 (7A) and 2 (7B) on the double-clamping screw reducer connectors 1 (6A) and 2 (6B) are rotated to control the tightness of the fixation, thereby adjusting the diluent injection height in the local control pipe (1) to achieve diluent injection in different areas of the flame. The burner inner tube (4) located at the bottom of the burner is connected to the double ferrule screw reducer connector one (6A) and the inner tube inlet (5) through the equal diameter tee connector (12). The double ferrule screw reducer connector one (6A) and the double ferrule screw reducer connector two (6B) are equipped with umbrella-shaped graphite pad one (14A) and umbrella-shaped graphite pad two (14B) inside; thereby preventing the fuel / oxidant entering from the inner tube inlet (5) from moving downward along the burner axis, but instead causing it to leave the burner outlet through the inner tube (4) in the direction of upward along the axis.

2. The integrated, locally diluted, precisely adjustable pollutant control and diffusion burner according to claim 1, characterized in that, The local control pipeline (1) is a hollow corundum tube with a length of 550 mm, an inner diameter of 0.4 mm, and an outer diameter of 0.8 mm.

3. The integrated, locally diluted, precisely adjustable pollutant control and diffusion burner according to claim 1, characterized in that, The local control pipeline (1) is located on the axis of the burner. The inlet of the diluent inside is located at the connection between the double ferrule screw reducer connector (6B) and the local control pipeline (1). The outlet of the diluent inside is above the burner.

4. The integrated, locally diluted, precisely adjustable pollutant control and diffusion burner according to claim 1, characterized in that, The inner tube (4), the secondary outer tube (3), and the outer tube (2) of the burner have inner diameters of 4mm, 16mm, and 36mm respectively from the inner to the outer diameter, and are all made of 304 stainless steel.

5. The integrated, locally diluted, precisely adjustable pollutant control and diffusion burner according to claim 1, characterized in that, The secondary outer tube (3) of the burner is provided with two radially symmetrical secondary outer tube inlets (11) at the air inlet end, and the included angle between two adjacent air inlets is 180°. The outer tube (2) of the burner is provided with two radially symmetrical outer tube inlets (10) at the air inlet end, and the included angle between two adjacent air inlets is 180°. Diluent is introduced into the local control pipeline (1) by setting a diluent pipeline (8) at the bottom of the burner.

6. The integrated, locally diluted, precisely adjustable pollutant control and diffusion burner according to claim 1, characterized in that, A flange (9) with a diameter of 200 mm is welded around the burner. Four circumferentially symmetrical through M6 threaded holes (13) are opened in the flange (9) to fix the burner on the stand.

7. The integrated, locally diluted, precisely adjustable pollutant control and diffusion burner according to claim 1, characterized in that, The pipe connected to the equal diameter tee (12) has an outer diameter of 6 mm.

8. The integrated, locally diluted, precisely adjustable pollutant control and diffusion burner according to claim 1, characterized in that, The double ferrule screw reducer adapter 1 (6A) and the double ferrule screw reducer adapter 2 (6B) are 6mm to 1 / 16in reducer adapters.

9. The integrated, locally diluted, precisely adjustable pollutant control and diffusion burner according to claim 1, characterized in that, The double ferrule screw reducer connector 1 (6A) and the double ferrule screw reducer connector 2 (6B) are internally fitted with umbrella-shaped graphite pads 1 (14A) and 2 (14B) with an inner diameter of 0.8mm to prevent gas leakage.

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