Micro-oil ignition and stable combustion device

Abstract

The utility model relates to a boiler micro - oil combustor technical field discloses a kind of micro - oil ignition steady - burning device, including micro - oil combustion air duct, and micro - oil combustion air duct is fixedly arranged spray head pipe in;Spray head pipe's oil injection pipe mouth place rotationally installs flow hole plate;Multiple spray oil holes for atomizing oil injection and driving flow hole plate rotation are evenly provided on flow hole plate, and each spray oil hole is all through flow hole plate;Slide bar is set in spray head pipe, and slide bar is through flow hole plate and is limit sliding cooperation with flow hole plate;Slide bar is fixedly provided with flow guide blunt body on the end portion outside spray head pipe;Fixed nut is fixedly arranged in the other end of slide bar, and self-closing spring is set on slide bar;Self-closing spring is fixed between fixed nut and flow hole plate.The flow hole plate of the device rotates, and the atomizing ring gap is rotated to spray oil by slide bar drive flow guide blunt body, so that oil mist is evenly distributed in micro - oil combustion air duct, oil gas contact is more sufficient, avoid local incomplete combustion or concentration uneven, improve combustion stability.

Description

Technical Field

[0001] This utility model relates to the technical field of boiler micro-oil burners, and in particular to a micro-oil ignition and stable combustion device. Background Technology

[0002] The micro-oil ignition and stable combustion device is an energy-saving combustion auxiliary equipment used in coal-fired boilers, mainly for thermal power plants and industrial boilers. Its core function is to use a very small amount of fuel oil as ignition energy to ignite pulverized coal in the main combustion zone and maintain combustion stability under harsh conditions such as low load and fluctuating coal quality. It replaces the traditional large-oil ignition / stable combustion technology and achieves the goal of significant fuel saving and consumption reduction.

[0003] The low-load adaptive micro-oil burner described in announcement number CN215831904U includes an oil inlet pipe, a pilot-operated overflow valve, a micro-oil combustion duct, a self-operated micro-oil nozzle, an ignition gun, and a combustion air inlet pipe. The pilot-operated overflow valve is installed on the oil inlet pipe, and its outlet is connected to the inlet of the self-operated micro-oil nozzle. The self-operated micro-oil nozzle and the ignition gun are installed inside the micro-oil combustion duct. The combustion air inlet pipe is connected to the micro-oil combustion duct, which is connected to a boiler. The self-operated micro-oil nozzle includes a nozzle tube and a flow guide body. The flow guide body is installed at the outlet end of the nozzle tube. The flow guide body has a connecting rod that is movably inserted into the nozzle tube. A self-closing spring is sleeved on the connecting rod, and a fixing nut is installed at the end of the connecting rod, which is fixedly connected to the self-closing spring.

[0004] Based on the above technical features, the problem is that in the existing technology, combustion is only achieved by using annular slit atomization and combustion-supporting air to mix. The oil mist and oxygen do not come into sufficient contact, which may result in incomplete local combustion. At the same time, since the oil spray angle of annular slit atomization is fixed, the local concentration is too high or the distribution is uneven, which can easily lead to uneven combustion and low combustion stability.

[0005] Therefore, it is necessary to solve the above problems by using a micro-oil ignition and stable combustion device. Utility Model Content

[0006] The purpose of this invention is to provide a micro-oil ignition and stable combustion device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a micro-oil ignition and stable combustion device, comprising a micro-oil combustion-supporting air duct, wherein a nozzle pipe is fixedly installed inside the micro-oil combustion-supporting air duct; and a flow equalization plate is rotatably installed at the oil injection port of the nozzle pipe. The flow equalization orifice plate is uniformly provided with a plurality of oil injection holes for atomizing oil injection and driving the flow equalization orifice plate to rotate, and each oil injection hole penetrates the flow equalization orifice plate. A sliding rod is provided inside the nozzle tube, and the sliding rod passes through the flow equalization orifice plate and is limited and slidably engaged with the flow equalization orifice plate; A flow guide blunt body is fixedly installed on the end of the slide rod located outside the nozzle tube; a fixing nut is fixedly installed on the other end of the slide rod, and a self-closing spring is sleeved on the slide rod; the self-closing spring is fixed between the fixing nut and the flow equalization orifice plate.

[0008] Preferably, all injection holes are tilted at the same angle.

[0009] Preferably, the slide bar has a polygonal cross-section, and the flow equalization plate has through holes that allow the slide bar to pass through and match the slide bar.

[0010] Preferably, an ignition gun is fixedly installed inside the micro-oil combustion-aiding air duct.

[0011] Preferably, an annular duct is fixedly fitted outside the micro-oil combustion-supporting air duct; air inlets connected to the micro-oil combustion-supporting air duct are evenly opened on the micro-oil combustion-supporting air duct, and each air inlet extends to and is connected to the annular duct; the annular duct is fixedly connected to the air inlet duct.

[0012] Preferably, each air inlet and the micro-oil combustion air duct is equipped with an obliquely guided blunt body.

[0013] Preferably, a limiting ring is fixedly provided on the inner wall of the nozzle pipe, and a limiting groove matching the limiting ring is opened at the circumferential end of the flow equalization plate; the limiting ring is located in the limiting groove, and the flow equalization plate and the limiting ring are in a limiting sliding fit.

[0014] Preferably, the cross-section of the limiting ring is T-shaped.

[0015] The technical effects and advantages of this utility model are as follows: First, the flow equalization orifice plate of this utility model can rotate and drive the flow guide blunt body to rotate through the slide rod, thereby realizing the rotation of the atomizing ring slit, and then realizing the rotational oil spraying, so that the atomized oil is evenly sprayed on the micro-oil combustion-supporting air duct, so that the oil mist has more sufficient contact with oxygen and prevents incomplete local combustion; at the same time, the oil spraying angle is not fixed, so as to prevent the local concentration from being too high or the distribution from being uneven, making the combustion more uniform and improving the combustion stability.

[0016] Secondly, the oblique guide blunt body of the air inlet of this utility model, combined with the rotating spray of oil mist, increases the flow path of the oil mist, allowing the oil mist to come into more complete contact with oxygen and resulting in more thorough combustion. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic half-sectional view of the present invention; Figure 3 This is an enlarged schematic diagram of point A in this utility model; Figure 4 This is a schematic diagram of the flow-guiding blunt body of this utility model; Figure 5 This is a schematic diagram of the flow equalization orifice plate of this utility model; Figure 6 This is a schematic diagram of the air inlet of this utility model.

[0018] In the diagram: 1. Air duct; 2. Nozzle pipe; 3. Limiting ring; 4. Flow equalization plate; 5. Limiting groove; 6. Oil injection hole; 7. Perforation; 8. Slide rod; 9. Flow guide blunt body; 10. Fixing nut; 11. Spring; 12. Annular air duct; 13. Air inlet pipe; 14. Air inlet hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] This utility model provides, for example Figures 1 to 6 The illustrated micro-oil ignition and stabilization device includes a micro-oil combustion-supporting air duct 1, one end of which is closed and coaxially inserted into a nozzle tube 2. The nozzle tube 2 is fixedly connected to the closed end of the micro-oil combustion-supporting air duct 1, and an ignition gun is fixedly installed inside the micro-oil combustion-supporting air duct 1. The nozzle pipe 2 is located outside the micro-oil combustion air duct 1 and its port is connected to the outlet of the pilot-operated overflow valve in a low-load adaptive micro-oil burner as described in announcement number CN215831904U. The other components connected to the pilot-operated overflow valve are the same as those in the low-load adaptive micro-oil burner described in announcement number CN215831904U, which are existing technologies and will not be described in detail here.

[0021] The nozzle pipe 2 is located inside the oil injection port of the micro-oil combustion air duct 1 and is coaxially mounted with the flow equalization plate 4.

[0022] Specifically, a limiting ring 3 is coaxially fixed on the inner wall of the nozzle pipe 2, and a limiting groove 5 is opened at the circumferential end of the flow equalization plate 4. The cross-section of the limiting ring 3 cut along the axial direction is T-shaped, and the limiting groove 5 matches the limiting ring 3. The limiting ring 3 is located in the limiting groove 5, and the flow equalization plate 4 and the limiting ring 3 are in a limiting sliding fit.

[0023] Multiple injection holes 6 are formed on the flow equalization orifice plate 4 for atomizing oil spray and driving the flow equalization orifice plate 4 to rotate. Each injection hole 6 penetrates the flow equalization orifice plate 4. The multiple injection holes 6 are arranged in a circumferential array along the central axis of the flow equalization orifice plate 4, and all injection holes 6 are inclined at the same angle.

[0024] Specifically, all the oil injection holes 6 are arranged in a fan-shaped pattern to receive the fluid thrust.

[0025] A slide bar 8 is installed inside the nozzle pipe 2. The slide bar 8 passes through the flow equalization orifice plate 4 and is in a limiting sliding fit with the flow equalization orifice plate 4.

[0026] Specifically, the slide rod 8 has a polygonal cross-section, and a through hole 7 is formed on the flow equalization plate 4. The through hole 7 matches the slide rod 8, and the slide rod 8 passes through the through hole 7 and is in a limiting sliding fit with the through hole 7. The flow equalization plate 4 and the slide rod 8 are in a driving fit.

[0027] A flow guide blunt body 9 is fixedly installed on the end of the slide rod 8 located outside the nozzle pipe 2. A fixing nut 10 is fixedly installed on the other end of the slide rod 8, and a self-closing spring 11 is sleeved on the slide rod 8. One end of the self-closing spring 11 is fixedly connected to the fixing nut 10, and the other end is fixedly connected to the flow equalization orifice plate 4.

[0028] An annular duct 12 is fixedly fitted onto the outside of the micro-oil combustion-supporting air duct 1. Multiple air inlets 14 are opened on the micro-oil combustion-supporting air duct 1, and these inlets 14 are evenly distributed along the circumference of the micro-oil combustion-supporting air duct 1. Each air inlet 14 extends to and connects to the annular duct 12. The annular duct 12 is fixedly connected to an air inlet pipe 13. The inlet of the air inlet pipe 13, away from the annular duct 12, is connected to and connected to a blower, which is existing technology and will not be described in detail here. Each air inlet 14 and the micro-oil combustion air duct 1 is obliquely guided by a blunt body 9. Working principle: In the initial state, the self-closing spring 11 is in the natural state, the flow guide blunt body 9 covers the oil injection port of the nozzle pipe 2, and the flow equalization plate 4 is limited and engaged with the limiting ring 3 on the inner wall of the nozzle pipe 2 through the limiting groove 5, so as to maintain a stationary state.

[0029] When the device starts working, fuel oil is introduced into the oil inlet pipeline. The oil pressure is regulated by the pilot-operated overflow valve associated with the boiler load, and the regulated fuel oil enters the nozzle pipe 2.

[0030] Under pressure, fuel oil is ejected through the evenly distributed inclined injection holes 6 on the flow equalization plate 4. The inclined design of the injection holes 6 generates lateral thrust during fuel injection, driving the flow equalization plate 4 to rotate around the limiting ring 3.

[0031] The flow equalization orifice plate 4 forms a limiting sliding fit with the slide rod 8 through the perforation 7. The rotating flow equalization orifice plate 4 drives the slide rod 8 to rotate synchronously, which in turn drives the flow guide blunt body 9 at the end of the slide rod 8 to rotate. At the same time, the fuel pressure pushes the self-closing spring 11 to contract, so that the flow guide blunt body 9 and the flow equalization orifice plate 4 form an atomizing annular gap. The rotating flow guide blunt body 9 makes the fuel rotate and spray along the atomizing annular gap, so as to achieve uniform distribution of fuel mist.

[0032] Combustion-supporting air enters the annular air duct 12 through the air inlet pipe 13, and then enters the interior of the micro-oil combustion-supporting air duct 1 through the air inlet hole 14 of the inclined guide blunt body 9 on the micro-oil combustion-supporting air duct 1. The pressure of the combustion-supporting air is stabilized at 1.5 kPa by the pressure reducing valve, and it is fully mixed with the rotating sprayed oil mist, which prolongs the flow path of the oil mist and improves the fullness of oil-gas contact.

[0033] The ignition gun in the micro-oil combustion duct 1 ignites the mixed oil-gas mixture, achieving ignition or ultra-low load stable combustion function; when the boiler load is 0%-10%, the pilot-operated overflow valve adjusts the oil pressure to 1.6MPa, and when the load is 10%-30%, it adjusts it to 0.8MPa, adapting to different low load conditions.

[0034] When the device stops working, the pilot-operated overflow valve closes, there is no fuel pressure in the nozzle pipe 2, the self-closing spring 11 returns to its natural state, pushes the flow equalization plate 4 to reset, and the flow guide blunt body 9 re-covers the fuel injection port of the nozzle pipe 2 to prevent fuel leakage and ensure safe use.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A micro-oil ignition and combustion stabilization device, comprising a micro-oil combustion-supporting air duct (1), characterized in that: The micro-oil combustion air duct (1) is fixedly installed with a nozzle pipe (2); a flow equalization plate (4) is rotatably installed at the oil injection port of the nozzle pipe (2). Multiple oil injection holes (6) are evenly opened on the flow equalization orifice plate (4) for atomizing oil spraying and driving the flow equalization orifice plate (4) to rotate. Each oil injection hole (6) penetrates the flow equalization orifice plate (4). A slide rod (8) is provided inside the nozzle pipe (2). The slide rod (8) passes through the flow equalization plate (4) and is in a limiting sliding cooperation with the flow equalization plate (4). A flow guide blunt body (9) is fixedly installed on the end of the slide rod (8) located outside the nozzle pipe (2); a fixing nut (10) is fixedly installed on the other end of the slide rod (8); a self-closing spring (11) is sleeved on the slide rod (8); the self-closing spring (11) is fixed between the fixing nut (10) and the flow equalization plate (4).

2. The micro-oil ignition and stable combustion device according to claim 1, characterized in that: All the oil injection holes (6) are tilted at the same angle.

3. The micro-oil ignition and stable combustion device according to claim 1, characterized in that: The cross-section of the slide bar (8) is polygonal, and the flow equalization plate (4) has a through hole (7) for the slide bar (8) to pass through and match the slide bar (8).

4. The micro-oil ignition and stable combustion device according to claim 1, characterized in that: An ignition gun is fixedly installed inside the micro-oil combustion air duct (1).

5. The micro-oil ignition and stable combustion device according to claim 1, characterized in that: The micro-oil combustion-supporting air duct (1) is fixedly fitted with an annular air duct (12); the micro-oil combustion-supporting air duct (1) is evenly provided with air inlets (14) that connect to the micro-oil combustion-supporting air duct (1), and each air inlet (14) extends to the annular air duct (12) and connects to the annular air duct (12); the annular air duct (12) is fixedly connected to the air inlet pipe (13).

6. The micro-oil ignition and stable combustion device according to claim 5, characterized in that: Each air inlet (14) and the micro-oil combustion air duct (1) are obliquely guided by a blunt body (9).

7. The micro-oil ignition and stable combustion device according to claim 1, characterized in that: A limiting ring (3) is fixedly installed on the inner wall of the nozzle pipe (2), and a limiting groove (5) matching the limiting ring (3) is opened on the circumferential end of the flow equalization plate (4); the limiting ring (3) is located in the limiting groove (5), and the flow equalization plate (4) and the limiting ring (3) are in a limiting sliding fit.

8. The micro-oil ignition and stable combustion device according to claim 7, characterized in that: The cross-section of the limiting ring (3) is T-shaped.

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