Detachable integrated pure oxygen pulverized coal burner

Abstract

The utility model provides a detachable integrated pure oxygen pulverized coal burner which is characterized in that a high-energy ignition gun is arranged in the center of the burner, and a fuel gas pipeline, a first oxygen pipeline, a pulverized coal pipeline and a second oxygen pipeline are sequentially arranged outside the high-energy ignition gun in a surrounding mode; the outlet sides of the primary oxygen pipeline, the pulverized coal pipeline and the secondary oxygen pipeline are respectively provided with an oxygen circulator, a pulverized coal nozzle and an oxygen cyclone; a fuel gas channel, a primary oxygen channel, a pulverized coal channel and a secondary oxygen pipeline channel are sequentially formed in a space between the outer wall of the high-energy ignition gun and the pipeline from inside to outside; the burner is further provided with an incandescent light spray head, a premixing cavity of the back-fire face of the incandescent light spray head is connected with the front end face of the first oxygen pipeline and used for circulating mixed gas of oxygen and fuel gas, and the high-energy ignition gun can ignite fuel sprayed out of the fuel gas pipeline. And fire sprayed out by the incandescent light spray head can ignite pulverized coal sprayed out by the pulverized coal pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of burners, in particular to a detachable integrated pure oxygen pulverized coal burner. BACKGROUND

[0002] Traditional pulverized coal burners usually use air as a combustion-supporting agent, which is mainly composed of nitrogen and oxygen, with nitrogen accounting for about 78%. Since nitrogen does not participate in the combustion reaction, it absorbs a large amount of heat, resulting in a decrease in combustion temperature and a decrease in thermal efficiency. Due to the low combustion efficiency, more fuel needs to be consumed to achieve the required temperature and heat output, and nitrogen reacts with oxygen at high temperatures to produce nitrogen oxides (NOx), causing environmental pollution. Therefore, pure oxygen combustion technology has gradually attracted attention.

[0003] Pure oxygen burners can significantly improve combustion efficiency and reduce pollutant emissions by using high-purity oxygen instead of air as a combustion-supporting agent. However, existing pure oxygen burners still have problems such as difficulty in igniting coal powder, uneven mixing of coal powder and oxygen, causing local high temperature or incomplete combustion, affecting combustion efficiency, and having a complex structure. CONTENT OF THE INVENTION

[0004] To solve the above problems, the present application provides a detachable integrated pure oxygen pulverized coal burner to achieve uniform mixing of coal powder and oxygen, reliable ignition, improve combustion efficiency, reduce pollutant emissions, and simplify the structure of the equipment and reduce maintenance costs.

[0005] To achieve the purpose of the present application, the present application provides a detachable integrated pure oxygen pulverized coal burner, which is provided with a high-energy ignition gun at the center position of the burner. The high-energy ignition gun is coaxially sleeved with a fuel gas pipeline, a first oxygen pipeline, a coal powder pipeline, a second oxygen pipeline, and a long-lasting lamp nozzle connected to the front end face of the first oxygen pipeline from the inside to the outside.

[0006] The space between the outer wall of the high-energy ignition gun and the pipeline is formed from the inside to the outside in sequence as a fuel gas passage, a first oxygen passage, a coal powder passage, and a second oxygen passage. The outlet side of the first oxygen pipeline, the coal powder pipeline, and the second oxygen pipeline is respectively provided with an oxygen circulation device, a coal powder nozzle, and an oxygen cyclone device.

[0007] The backfire surface of the long-lasting lamp nozzle is connected to the front end face of the first oxygen pipeline to form a premixing cavity, and the premixing cavity flows with a mixture of oxygen and fuel gas. The high-energy ignition gun can ignite the fuel gas sprayed from the fuel gas pipeline. The fire sprayed from the long-lasting lamp nozzle can ignite the coal powder sprayed from the coal powder pipeline.

[0008] Further, the fuel gas pipeline, the first oxygen pipeline, the pulverized coal pipeline and the second oxygen pipeline are respectively provided with a fuel gas inlet, a first oxygen inlet, a pulverized coal inlet and a second oxygen inlet.

[0009] The outlet side of the fuel gas pipeline and the second oxygen pipeline is respectively provided with a fuel gas nozzle and a second oxygen nozzle.

[0010] Further, the front end of the fuel gas nozzle is located in the premixing cavity of the pilot burner nozzle, the fuel gas nozzle is provided in a tapered structure, and a plurality of nozzles are uniformly arranged on the fuel gas nozzle.

[0011] Further, the angle between the axis of the pulverized coal nozzle and the axis of the pulverized coal pipeline is greater than 0°.

[0012] Further, the oxygen cyclone is connected with the flange of the pulverized coal nozzle, and the oxygen ring flow device is connected with the flange of the fuel gas pipeline.

[0013] Further, the oxygen ring flow device and the oxygen cyclone are respectively composed of a plurality of cyclone blades.

[0014] Further, the pulverized coal pipeline and the second oxygen pipeline are connected through flanges.

[0015] Further, the fuel gas pipeline and the first oxygen pipeline respectively send fuel gas and oxygen into the premixing cavity at the rear end of the pilot burner nozzle for mixing.

[0016] Further, the pilot burner nozzle has a convex boss tapering opening in the channel for uniformly mixing fuel gas and oxygen.

[0017] Further, the integrated pure oxygen pulverized coal burner further comprises a bluff body at the end of the pilot burner nozzle, and the bluff body is in a trapezoidal structure.

[0018] The beneficial effects of the embodiments of the present application are as follows:

[0019] The application provides a detachable integrated pure-oxygen coal powder burner. BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the provided drawings.

[0021] Figure 1 The application provides a detachable integrated pure-oxygen coal powder burner.

[0022] Figure 2 The application provides a detachable integrated pure-oxygen coal powder burner.

[0023] Figure 3 The application provides a detachable integrated pure-oxygen coal powder burner.

[0024] Figure 4 The application provides a detachable integrated pure-oxygen coal powder burner.

[0025] Figure 5 The application provides a detachable integrated pure-oxygen coal powder burner.

[0026] Figure 6 The application provides a detachable integrated pure-oxygen coal powder burner.

[0027] Mark No. 1 - high-energy ignition gun, 2 - fuel gas pipeline, 21 - fuel inlet, 22 - fuel gas nozzle, 3 - first oxygen pipeline, 31 - first oxygen inlet, 32 - oxygen circulation device, 4 - pulverized coal pipeline, 41 - pulverized coal inlet, 42 - pulverized coal nozzle, 5 - second oxygen pipeline, 51 - second oxygen inlet, 52 - second oxygen nozzle, 53 - oxygen cyclone device, 531 - cyclone piece, 6 - long-life lamp nozzle, 61 - premixed cavity, 62 - boss contraction. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0029] The terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features; in the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0030] Embodiment 1:

[0031] Figure 1 An integrative pure oxygen pulverized coal burner is provided for the embodiments of the present application, which is provided with a high-energy ignition gun 1 at the center position, and the high-energy ignition gun 1 is coaxially sleeved with a fuel gas pipeline 2, a first oxygen pipeline 3, a pulverized coal pipeline 4, a second oxygen pipeline 5 and a long-life lamp nozzle 6 connected with the front end face of the first oxygen pipeline 3 from inside to outside.

[0032] The space between the outer wall of the high-energy ignition gun 1 and the pipeline is formed into a fuel gas passage, a first oxygen passage, a pulverized coal passage and a second oxygen pipeline passage from inside to outside; the outlet side of the first oxygen pipeline 3, the pulverized coal pipeline 4 and the second oxygen pipeline 5 is respectively provided with an oxygen circulation device 32, a pulverized coal nozzle 42 and an oxygen cyclone device 53.

[0033] The backfire face of the long-life lamp nozzle 6 is connected with the front end face of the first oxygen pipeline 3 to form a premixed cavity 61, the premixed cavity 61 circulates mixed gas of oxygen and fuel gas, the high-energy ignition gun 1 can ignite the fuel ejected from the fuel gas pipeline 2; the fire ejected from the long-life lamp nozzle 6 can ignite the pulverized coal ejected from the pulverized coal pipeline 4.

[0034] In the embodiment, fuel gas and oxygen are respectively delivered into the premixing cavity of the long-lasting lamp nozzle by the fuel gas pipeline and the first oxygen pipeline, mixed and ignited by the high-energy ignition gun, the ignited long-lasting flame is sprayed out of the long-lasting lamp nozzle, and the long-lasting flame ignites the coal powder sprayed out of the coal powder pipeline under the combustion-supporting effect of the combustion-supporting agent sprayed out of the second oxygen pipeline. The oxygen circulation device can change the flow field of the combustion-supporting gas delivered by the first oxygen pipeline, and the combustion-supporting gas is swirled and mixed with the fuel gas for combustion under the driving effect of the swirling combustion-supporting gas, thereby improving the mixing uniformity, and further improving the ignition success rate of the fuel gas. Meanwhile, the oxygen circulation device can also change the flow field of the combustion-supporting gas delivered by the second oxygen pipeline, and the combustion-supporting gas is swirled and mixed with the coal powder under the driving effect of the swirling combustion-supporting gas, thereby improving the mixing uniformity, and further improving the ignition success rate and combustion efficiency of the coal powder.

[0035] It is particularly pointed out that the first oxygen inlet pipeline and the second oxygen inlet pipeline are connected to the combustion-supporting agent with a concentration in the range of pure oxygen concentration, and the generation of NOx does not need to be considered. After the long-lasting lamp formed by the high-energy ignition gun igniting the fuel gas ignites the coal powder, the delivery of the fuel gas and the oxygen delivered by the first oxygen pipeline can be stopped to extinguish the long-lasting lamp, or the delivery can be kept to keep the long-lasting lamp in an ignited state.

[0036] Optionally, as shown in Figure 1 the fuel gas pipeline 2, the first oxygen pipeline 3, the coal powder pipeline 4, and the second oxygen pipeline 5 are respectively provided with a fuel inlet 21, a first oxygen inlet 31, a coal powder inlet 41, and a second oxygen inlet 51 at the inlet side; and the fuel gas pipeline 2 and the second oxygen pipeline 5 are respectively provided with a fuel gas nozzle 22 and a second oxygen nozzle 52 at the outlet side.

[0037] Optionally, the front end of the fuel gas nozzle 22 is located in the premixing cavity of the long-lasting lamp nozzle 6, the fuel gas nozzle 22 is provided in a conical structure, and a plurality of nozzle holes are uniformly arranged on the fuel gas nozzle 22.

[0038] Optionally, the included angle between the axis of the coal powder nozzle 42 and the axis of the second oxygen pipeline 5 is greater than 0°.

[0039] In a possible implementation, fuel gas, first oxygen, coal powder, and second oxygen enter from the inlet side of the respective pipelines, and are respectively sprayed out of the respective pipelines by the respective nozzles. The fuel gas nozzle, the coal powder nozzle, and the second oxygen nozzle are respectively screwed or welded to the outlet end of the fuel gas pipeline, the coal powder pipeline, and the second oxygen pipeline, and the nozzle holes uniformly distributed on the fuel gas nozzle directly mix with the oxygen delivered by the first oxygen pipeline in the premixing cavity of the long-lasting lamp nozzle 6. The design of the nozzle holes can improve the mixing amount of the fuel gas and the amount of the swirling flue gas, and improve the ignition success rate of the high-energy ignition gun.

[0040] In one possible implementation, the angle between the axis of the coal powder nozzle and the axis of the coal powder pipeline 4 can be 10-60°, which is designed to make the coal powder and oxygen interact with each other through shearing, further improve the uniformity of the mixture of the coal powder and oxygen, and improve the combustion efficiency of the fuel.

[0041] Optionally, as shown in Figure 2 and Figure 3 , the oxygen cyclone 53 is flange-connected with the coal powder nozzle 42, and the oxygen ring flow device 32 is flange-connected with the fuel gas pipeline 2.

[0042] Optionally, as shown in Figure 4 and Figure 5 , the oxygen ring flow device 32 and the oxygen cyclone 53 are respectively composed of a plurality of cyclone blades.

[0043] In one possible implementation, the oxygen cyclone and the coal powder nozzle, and the oxygen ring flow device and the long-lasting lamp nozzle are flange-connected, which facilitates the installation and maintenance and replacement of the oxygen cyclone and the oxygen ring flow device.

[0044] It can be understood that the axial rotation angle of the oxygen ring flow device and the oxygen cyclone is greater than 0°, and the axial rotation angle of the oxygen ring flow device and the oxygen cyclone composed of a plurality of cyclone blades is different according to different design requirements. The oxygen ring flow device located outside the fuel gas passage and inside the first oxygen passage can make the pure oxygen flow enter the premixing cavity of the long-lasting lamp nozzle in a rotating manner, disturb the mixing process, and make the fuel gas and the pure oxygen mix more uniformly, thereby improving the ignition success rate of the high-energy ignition gun and the stability of the flame. Similarly, the oxygen cyclone located outside the coal powder passage and inside the second oxygen passage can make the pure oxygen flow be sprayed in a rotating manner, can entrain the coal powder, can make the oxygen and the coal powder mix fully, can ensure the stable combustion of the coal powder, and can prevent the occurrence of the flame-out phenomenon.

[0045] Optionally, the coal powder pipeline 4 and the second oxygen pipeline 5 are flange-connected.

[0046] In one possible implementation, the coal powder pipeline and the second oxygen pipeline are flange-connected, which facilitates the installation and maintenance and replacement, and the flange connection belongs to the conventional technical means in the field.

[0047] Optionally, the fuel gas pipeline 2 and the first oxygen pipeline 3 respectively send the fuel gas and the oxygen into the premixing cavity at the rear end of the long-lasting lamp nozzle 6 for mixing.

[0048] In one possible implementation, the length of the premixing cavity formed by the long-lasting lamp nozzle and the first oxygen pipeline can be 50-150 mm.

[0049] Optionally, as shown in Figure 6 The channel of the long-lasting lamp nozzle 6 has a boss contraction 62 for mixing the fuel gas and oxygen uniformly.

[0050] In one possible implementation, the premixing cavity of the long-lasting lamp nozzle is located at the front end of the first oxygen pipeline, which can be a welded connection. The oxygen from the oxygen circulation device and the fuel gas from the fuel nozzle are mixed in the premixing cavity for the first time, and then mixed for the second time through the boss contraction. After sufficient mixing, the mixture is ignited by the high-energy ignition gun. The second mixing improves the uniformity of the mixture of oxygen and fuel gas, improves the ignition success rate, and is conducive to the stability of the long-lasting lamp flame.

[0051] It can be understood that the design of the boss contraction in the channel of the long-lasting lamp nozzle can make the flame ignited by the high-energy ignition gun be ejected from the nozzle at high speed to form a small fire, which directly ignites the mixture of coal powder and oxygen from the long-lasting lamp nozzle to the fire end.

[0052] Optionally, the blunt body 7 at the end of the long-lasting lamp nozzle 6 is in a trapezoidal structure, and the coal powder gas flow generates backflow in the tail wing area of the blunt body 7 to suck high-temperature flue gas.

[0053] In one possible implementation, the blunt body in a trapezoidal structure is nested at the fire end of the long-lasting lamp nozzle. After the coal powder is ignited by the long-lasting lamp flame, a large amount of flue gas can be sucked, and a stable high-temperature backflow area is formed in the tail wing area of the blunt body. The continuously backflowing high-temperature flue gas continuously ignites the coal powder and oxygen from the root of the flame, thereby playing a role in stabilizing the flame and combustion.

[0054] The embodiment of the present application provides a detachable integrated pure oxygen coal powder burner. Fuel gas and pure oxygen are respectively sent to a premixing cavity at the end of a high-energy ignition gun by a fuel gas pipeline and a first oxygen pipeline, mixed uniformly, and the high-energy ignition gun ignites the fuel gas and oxygen mixture to form a long-lasting lamp. The coal powder is mixed uniformly with pure oxygen ejected by a second oxygen pipeline through a coal powder pipeline, and is ignited by the long-lasting lamp. The oxygen circulation device and the coal powder nozzle improve the mixing effect of the coal powder and the oxygen. The premixing cavity at the rear end of the long-lasting lamp nozzle improves the mixing effect of the oxygen and the fuel gas, improves the ignition success rate and stability of the ignition gun, and realizes staged ignition by igniting the fuel gas by the high-energy ignition gun and then igniting the coal powder by the long-lasting lamp nozzle, thereby solving the problem of difficult ignition of the coal powder. In addition, the burner adopts a split structure, and the ignition gun, the long-lasting lamp nozzle, the coal powder pipeline, and the oxygen pipeline are detachable, which is convenient for maintenance and replacement.

[0055] The above examples are only used to illustrate the technical solutions of the present application, but not to limit them. The present application is not limited to the exact structure as has been described above and shown in the drawings, and the specific implementation of the present application should not be considered as limited to these descriptions. Any changes and modifications made by those skilled in the art without departing from the concept of the present application should be considered as falling within the scope of the present application.

Claims

1. A detachable integrated pure oxygen pulverized coal burner, characterized in that, The application relates to a high-energy ignition gun for a coal powder burner. The high-energy ignition gun (1) is provided with a fuel gas pipeline (2), a first oxygen pipeline (3), a coal powder pipeline (4), a second oxygen pipeline (5) and a long-lasting lamp nozzle (6) connected with the front end face of the first oxygen pipeline (3) from inside to outside. The space between the outer wall of the high-energy ignition gun (1) and the pipelines is sequentially formed into a fuel gas passage, a first oxygen passage, a coal powder passage and a second oxygen pipeline passage from inside to outside. The long-lasting lamp nozzle (6) is connected with the front end face of the first oxygen pipeline (3) to form a premixing cavity (61), mixed gas of oxygen and fuel gas flows in the premixing cavity (61), the high-energy ignition gun (1) can ignite the fuel ejected from the fuel gas pipeline (2), and the long-lasting lamp nozzle (6) can ignite the coal powder ejected from the coal powder pipeline (4).

2. The integrated pure-oxygen pulverized coal combustor according to claim 1, wherein The inlet sides of the fuel gas pipeline (2), the first oxygen pipeline (3), the coal powder pipeline (4) and the second oxygen pipeline (5) are respectively provided with a fuel inlet (21), a first oxygen inlet (31), a coal powder inlet (41) and a second oxygen inlet (51). The outlet sides of the fuel gas pipeline (2) and the second oxygen pipeline (5) are respectively provided with a fuel gas nozzle (22) and a second oxygen nozzle (52).

3. The integrated pure-oxygen pulverized coal combustor according to claim 2, characterized by The front end of the fuel gas nozzle (22) is located in the premixing cavity of the long-lasting lamp nozzle (6), the fuel gas nozzle (22) is provided with a necked structure, and a plurality of nozzle holes are uniformly arranged on the fuel gas nozzle (22).

4. The integrated pure-oxygen pulverized coal combustor according to claim 1, wherein The angle between the axis of the coal powder nozzle (42) and the axis of the second oxygen pipeline (5) is greater than 0 degrees.

5. The integrated pure-oxygen pulverized coal combustor according to claim 2, wherein The oxygen cyclone (53) is connected with the flange of the coal powder nozzle (42), and the oxygen ring flow device (32) is connected with the flange of the fuel gas pipeline (2).

6. The integrated pure-oxygen pulverized coal combustor according to claim 1, wherein The oxygen ring flow device (32) and the oxygen cyclone (53) are respectively composed of a plurality of cyclone blades.

7. The integrated pure-oxygen pulverized coal combustor according to claim 1, wherein The coal powder pipeline (4) and the second oxygen pipeline (5) are connected through flanges.

8. The integrated pure-oxygen pulverized coal combustor according to claim 1, wherein The fuel gas pipeline (2) and the first oxygen pipeline (3) respectively send fuel gas and oxygen into the premixing cavity at the rear end of the long-lasting lamp nozzle (6) to mix.

9. The integrated pure-oxygen pulverized coal combustor according to claim 8, characterized by The channel of the long-lasting lamp nozzle (6) is provided with a boss necking (62) for uniformly mixing fuel gas and oxygen.

10. The integrated pure-oxygen pulverized coal combustor according to claim 1, wherein A blunt body (7) is arranged at the end of the long-lasting lamp nozzle (6), the blunt body (7) is a trapezoidal structure, backflow is generated in the tail wing area of the blunt body (7), and high-temperature flue gas is entrained.

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