A center oxygen supplementing type overfire air burner suitable for oxygen-enriched combustion

Abstract

The present application relates to the field of combustion machines, in particular to a center oxygen supplementing type overfire air burner suitable for oxygen-rich combustion, in order to solve the problem that there is still lack of combustion machine with controllable oxygen and carbon dioxide in the arrangement of new units and the modification of old units, two overfire air nozzles are symmetrically arranged up and down, the two overfire air nozzles are arranged at the outlet end of the carbon dioxide channel along the flow direction of carbon dioxide in the carbon dioxide channel, the oxygen supplementing pipeline penetrates through the side wall of the carbon dioxide channel, the outlet end of the oxygen supplementing pipeline is arranged towards the overfire air nozzle, the outlet end of the oxygen supplementing pipeline is connected with the oxygen supplementing device, and the inlet end of the oxygen supplementing pipeline is arranged outside the carbon dioxide channel, the oxygen and the carbon dioxide are respectively supplied, and the amount of the oxygen and the carbon dioxide can be accurately adjusted; the appearance of the present application is similar to the structure of the existing direct-flow burner of the power plant boiler in service, which is not only convenient for the modification of old units, but also can greatly refer to the existing boiler arrangement for the new unit.

Description

Technical Field

[0001] This invention relates to the field of combustion equipment and technology, specifically to a center-oxygenated burnout air burner suitable for oxygen-enriched combustion. Background Technology

[0002] Oxygen-enriched combustion technology is one of the important methods for carbon capture, utilization, and storage (CCS and CCUS), and it has great application potential in the current context of "carbon peaking" and "carbon neutrality". Currently, countries such as Germany and Australia have established demonstration projects for carbon capture using oxygen-enriched combustion technology, and my country also established an oxygen-enriched combustion demonstration project base in 2011.

[0003] Oxygen-enriched combustion differs from traditional combustion methods. Oxygen is supplied to the furnace separately, while a certain amount of carbon dioxide is added to ensure a large air volume, achieving the purpose of cooling the combustion equipment. As for the burnout air, in practical applications, it is necessary to ensure that oxygen and carbon dioxide are fully mixed, and that the burnout air has strong penetrating power. Furthermore, according to the principle of staged combustion, the higher the reduction zone, the better the staged combustion effect; that is, the burnout air layer should be maintained at a certain height within the furnace.

[0004] Currently, there is a lack of combustion units with controllable oxygen and carbon dioxide levels in both new unit layouts and old unit renovations. Summary of the Invention

[0005] The purpose of this invention is to address the problem of the lack of combustion units with controllable oxygen and carbon dioxide quantities in the layout of new units and the renovation of old units. This invention proposes a center-oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion.

[0006] This invention is implemented through the following scheme:

[0007] A center-oxygenated burnout air burner suitable for oxygen-enriched combustion includes a carbon dioxide channel, an oxygenator, an oxygen supply line, and two burnout air nozzles.

[0008] Two burnout air nozzles are symmetrically arranged vertically and positioned at the outlet end of the carbon dioxide channel along the direction of carbon dioxide flow. The oxygen supply pipeline passes through the side wall of the carbon dioxide channel, with its outlet end facing the burnout air nozzles. The outlet end of the oxygen supply pipeline is connected to the oxygenator, and its inlet end is located outside the carbon dioxide channel.

[0009] Furthermore, the oxygenator includes a windward side and a leeward side;

[0010] The smaller end of the oxygenator's windward side is connected to the outlet end of the oxygen supply pipeline, and the larger end of the oxygenator's windward side is connected to the leeward side of the oxygenator. Multiple oxygen outlets are provided on the leeward side of the oxygenator.

[0011] Furthermore, both the windward and leeward sides of the oxygenator are frustoconical, and the windward and leeward sides of the oxygenator are set in opposite directions.

[0012] Furthermore, multiple nozzle baffles are evenly spaced inside the burnout air nozzle.

[0013] Furthermore, the burnout air nozzle outlet end is provided with multiple longitudinal and multiple transverse flame-stabilizing ribs along its inner wall.

[0014] Furthermore, wear-resistant tiles are installed at the large bends of the oxygen supply pipeline.

[0015] Furthermore, the angle between the windward side of the oxygenator and the axis is 35° to 55°, and the angle between the leeward side of the oxygenator and the horizontal plane is approximately 20° to 30°.

[0016] Furthermore, the longitudinal width of the oxygenator is 1 / 2 to 2 / 3 of the longitudinal width of the carbon dioxide channel; the transverse width of the oxygenator is 1 / 2 to 2 / 3 of the transverse width of the carbon dioxide channel.

[0017] Furthermore, along the gas flow direction inside the oxygenator, the distance between the end of the oxygenator and the burnout air nozzle should be at least 30cm.

[0018] Furthermore, the thickness of both the longitudinal and transverse flame-stabilizing ribs is greater than 6 mm.

[0019] Beneficial effects:

[0020] The purpose of this invention is to provide a center-oxygenated burnout air burner suitable for oxygen-enriched combustion. This burner is a key device for staged combustion and burnout in oxygen-enriched combustion in power plant boilers, with controllable amounts of oxygen and carbon dioxide. Furthermore, this invention also has the advantage of facilitating the retrofitting of existing power plant boilers.

[0021] The burnout air nozzle of this invention is configured with upper and lower layers, which can increase the nozzle air velocity of the oxygen and carbon dioxide mixture so that it can reach the center of the furnace smoothly to assist in burnout; it can also increase the height of the furnace reduction zone, so that staged combustion can be fully completed.

[0022] In this invention, oxygen is supplied from the center of carbon dioxide and mixed with it before being sent into the furnace to assist combustion. Because carbon dioxide has high momentum, it can carry oxygen smoothly to the center of the furnace, ensuring the effective oxygen supply for the burnout air.

[0023] In this invention, oxygen and carbon dioxide are supplied separately, and the amount of each oxygen and carbon dioxide can be precisely adjusted.

[0024] The appearance of this invention is similar to the structure of the current DC burner in thermal power plant boilers, which not only facilitates the retrofitting of old units, but also allows for a large-scale reference to the existing boiler layout for new units. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a center-oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion according to the present invention;

[0027] Figure 2 Figure 1 The left view;

[0028] Figure 3 This is a schematic diagram of an oxygen supplementer;

[0029] Figure 4 yes Figure 3 The left view. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0035] To facilitate understanding of the embodiments of the present invention, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0036] Combination Figures 1-4 This specific implementation method is described as follows:

[0037] Specific implementation method 1: A center oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion, which includes a carbon dioxide channel 1, an oxygen supplementer, an oxygen supplementation pipeline 9 and two burnout air nozzles 5;

[0038] Two burnout air nozzles 5 are symmetrically arranged vertically. The two burnout air nozzles 5 are arranged at the outlet end of the carbon dioxide channel 1 along the direction of carbon dioxide flow. The oxygen supply pipeline 9 passes through the side wall of the carbon dioxide channel 1. The outlet end of the oxygen supply pipeline 9 is arranged facing the burnout air nozzles 5. The outlet end of the oxygen supply pipeline 9 is connected to the oxygenator. The inlet end of the oxygen supply pipeline 9 is arranged outside the carbon dioxide channel 1.

[0039] Specific Implementation Method 2: A center-oxygenated burnout air burner suitable for oxygen-enriched combustion, wherein the oxygenator includes an oxygenator windward side 2 and an oxygenator leeward side 3;

[0040] The small end of the oxygen supplementer's windward side 2 is connected to the outlet end of the oxygen supplementation pipeline 9, and the large end of the oxygen supplementer's windward side 2 is connected to the oxygen supplementer's leeward side 3. The oxygen supplementer's leeward side 3 is provided with multiple oxygen outlets 4.

[0041] In this embodiment, the total area of ​​the oxygen outlet 4 is determined by the amount of oxygen supplied and the oxygen flow rate during actual use. The oxygen flow rate at the oxygen outlet 4 is 1.1 to 1.3 times the carbon dioxide flow rate in the carbon dioxide channel 1.

[0042] Other implementation methods are the same as those in Specific Implementation Method 1.

[0043] Specific implementation method three: A center oxygen supplementation type burnout air burner suitable for oxygen-enriched combustion, wherein the windward side 2 and the leeward side 3 of the oxygen supplementer are both frustoconical, and the windward side 2 and the leeward side 3 of the oxygen supplementer are arranged in opposite directions.

[0044] Other implementation methods are the same as those in Specific Implementation Method Two.

[0045] Specific implementation method four: A center oxygen supplementation type burnout air burner suitable for oxygen-rich combustion, wherein multiple nozzle baffles 8 are provided at equal intervals inside the burnout air nozzle 5.

[0046] Other implementation methods are the same as those in Specific Implementation Method 1.

[0047] Specific implementation method five: A center oxygen supplementation type burnout air burner suitable for oxygen-rich combustion, wherein the burnout air nozzle 5 has multiple longitudinal combustion stabilizing ribs 6 and multiple transverse combustion stabilizing ribs 7 along its inner wall at the outlet end.

[0048] Other implementation methods are the same as those in Specific Implementation Method 1.

[0049] Specific implementation method six: A center oxygen supply type burnout air burner suitable for oxygen-enriched combustion, wherein wear-resistant tiles 10 are installed at the large bend of the oxygen supply pipeline 9.

[0050] Other implementation methods are the same as those in Specific Implementation Method 1.

[0051] Specific implementation method seven: A center-oxygenated burnout air burner suitable for oxygen-enriched combustion, wherein the angle between the windward side 2 of the oxygenator and the axis is 35° to 55°, and the angle between the leeward side 3 of the oxygenator and the horizontal plane is approximately 20° to 30°.

[0052] Other implementation methods are the same as those in Specific Implementation Method Two.

[0053] Specific implementation method eight: A center-oxygenated burnout air burner suitable for oxygen-enriched combustion, wherein the longitudinal width of the oxygenator is 1 / 2 to 2 / 3 of the longitudinal width of the carbon dioxide channel 1; and the transverse width of the oxygenator is 1 / 2 to 2 / 3 of the transverse width of the carbon dioxide channel 1.

[0054] Other implementation methods are the same as those in Specific Implementation Method 1.

[0055] Specific Implementation Method Nine: A center-oxygenated burnout air burner suitable for oxygen-enriched combustion, wherein the distance between the end of the oxygenator and the burnout air nozzle 5 is at least 30cm along the gas flow direction inside the oxygenator.

[0056] Other implementation methods are the same as those in Specific Implementation Method 1.

[0057] Specific Implementation Method 10: A center-oxygenated burnout air burner suitable for oxygen-enriched combustion, wherein the thickness of the longitudinal stabilizing rib 6 and the thickness of the transverse stabilizing rib 7 are both greater than 6 mm.

[0058] Other implementation methods are the same as those in Specific Implementation Method 5.

[0059] In other embodiments, the temperature difference between the carbon dioxide input through carbon dioxide channel 1 and the oxygen input through oxygen supplementation line 9 is no greater than 20°C.

[0060] Connect a carbon dioxide pipeline to the carbon dioxide channel and an oxygen supply pipeline to the oxygen inlet pipeline. Install the invention at the corresponding burnout air burner position in the boiler.

[0061] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A center-oxygenated burnout air burner suitable for oxygen-enriched combustion, characterized in that: It includes a carbon dioxide channel (1), an oxygenator, an oxygen supply line (9), and two burnout air nozzles (5); Two burnout air nozzles (5) are symmetrically arranged vertically. The two burnout air nozzles (5) are arranged at the outlet end of the carbon dioxide channel (1) along the carbon dioxide flow direction inside the carbon dioxide channel (1). The oxygen supply pipeline (9) passes through the side wall of the carbon dioxide channel (1). The outlet end of the oxygen supply pipeline (9) is set towards the burnout air nozzle (5). The outlet end of the oxygen supply pipeline (9) is connected to the oxygenator. The inlet end of the oxygen supply pipeline (9) is set outside the carbon dioxide channel (1). The thickness of both the longitudinal flame-stabilizing rib (6) and the transverse flame-stabilizing rib (7) is greater than 6 mm.

2. A center-oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion according to claim 1, characterized in that: The oxygenator includes an oxygenator windward side (2) and an oxygenator leeward side (3); The small end of the oxygen supplementer's windward side (2) is connected to the outlet end of the oxygen supplementation pipeline (9), and the large end of the oxygen supplementer's windward side (2) is connected to the oxygen supplementer's leeward side (3). The oxygen supplementer's leeward side (3) is provided with multiple oxygen outlets (4).

3. A center-oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion according to claim 2, characterized in that: Both the windward side (2) and the leeward side (3) of the oxygenator are frustoconical, and the windward side (2) and the leeward side (3) of the oxygenator are set in opposite directions.

4. A center-oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion according to claim 1, characterized in that: Multiple nozzle baffles (8) are provided at equal intervals inside the burnout air nozzle (5).

5. A center-oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion according to claim 1, characterized in that: The burnout air nozzle (5) has multiple longitudinal flame-stabilizing ribs (6) and multiple transverse flame-stabilizing ribs (7) along its inner wall at the outlet end.

6. A center-oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion according to claim 1, characterized in that: Abrasion-resistant tiles (10) are installed at the large bends of the oxygen supply pipeline (9).

7. A center-oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion as described in claim 2, characterized in that: The angle between the windward side (2) of the oxygenator and the axis is 35° to 55°, and the angle between the leeward side (3) of the oxygenator and the horizontal plane is 20° to 30°.

8. A center-oxygen-supplemented burnout air burner suitable for oxygen-enriched combustion as described in claim 1, characterized in that: The longitudinal width of the oxygen supplement is 1 / 2 to 2 / 3 of the longitudinal width of the carbon dioxide channel (1); the transverse width of the oxygen supplement is 1 / 2 to 2 / 3 of the transverse width of the carbon dioxide channel (1).

9. A center-oxygen-supplemented burner for oxygen-enriched combustion as described in claim 1, characterized in that: Along the gas flow direction inside the oxygenator, the distance between the end of the oxygenator and the burnout air nozzle (5) is at least 30cm.

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