A device for providing a boost air for a post-combustion afterburner

Abstract

The present application relates to the technical field of boiler combustion, and particularly relates to a kind of opposed combustion afterburning lifting air device, including afterburning lifting air device, the afterburning lifting air device is used by supporting combustion furnace and combustor, the afterburning lifting air device is arranged in the lower layer of the combustion furnace, the afterburning lifting air device includes air inlet cylinder, the air inlet cylinder is provided with air inlet and air outlet, the outer wall of the air inlet cylinder is sleeved with the adjusting ring plate for adjusting the air inlet amount of the air inlet, by changing the shielding area of adjusting ring plate on the air inlet, the air inlet amount of the air inlet is adjusted.The device can not only make up for the insufficient range of combustor, meet the air supply demand of combustor, but also better organize flow field, lift the pulverized coal of lower layer combustor, prevent the sinking movement of pulverized coal, and can supply oxygen in time, improve the fly ash burnout rate of furnace, thereby improve the efficiency of boiler combustor, reduce the carbon content of fly ash, and reduce NO emission.

Description

Technical Field

[0001] This invention relates to the field of boiler combustion technology, and in particular to a counter-current combustion supplementary combustion lifting air device. Background Technology

[0002] The burner is a crucial component in boiler equipment, determining fuel ignition and stable combustion. Its design plays a vital role in the boiler's safe operation and peak-shaving performance. The counter-current combustion method, with its front and rear walls arranged in a swirl burner configuration, offers superior performance in terms of thorough air-coal mixing and uniform heat load distribution, and has gradually become the preferred combustion method for supercritical and ultra-supercritical units.

[0003] However, existing swirl burners have the following technical problems when used in conjunction with combustion furnaces: because the secondary air of the burner is swirling air, the range is insufficient and cannot meet the air supply requirements in the middle. After the burner is counter-current, some pulverized coal will sink, resulting in an increase in the carbon content of the slag. At the same time, the oxygen content in the middle area of ​​the furnace is insufficient, and the burnout air is difficult to penetrate to the middle of the furnace, resulting in insufficient oxygen content in the pulverized coal in the middle of the furnace, causing the combustion flame to move upward and the carbon content of the fly ash to increase. Summary of the Invention

[0004] The main objective of this invention is to overcome the shortcomings of existing technologies and provide a counter-current combustion supplementary air lifting device. This device not only compensates for insufficient burner range and meets the burner's supplementary air requirements, but also better organizes the flow field, lifts the pulverized coal in the lower burners, prevents the pulverized coal from sinking, and can replenish oxygen in a timely manner, thereby improving the combustion rate of fly ash in the furnace, thus improving boiler burner efficiency, reducing fly ash carbon content, and reducing NO emissions.

[0005] The technical solution adopted by the present invention to achieve its technical objective is: a counter-firing combustion supplementary combustion lifting air device, including a supplementary combustion lifting air device, the supplementary combustion lifting air device being used in conjunction with a combustion furnace and a burner, the supplementary combustion lifting air device being disposed on the lower layer of the combustion furnace, the burner being located above the supplementary combustion lifting air device and being fixedly installed on the combustion furnace;

[0006] The supplementary combustion lifting air device includes an air inlet duct with an air inlet and an air outlet. Air enters the air inlet duct through the air inlet, and air enters the combustion furnace through the air outlet. An adjusting ring plate is fitted on the outer wall of the air inlet duct to adjust the air volume of the air inlet. The air volume of the air inlet is adjusted by changing the blocking area of ​​the adjusting ring plate on the air inlet.

[0007] Preferably, two air inlets are provided on the air inlet duct. The air inlets are recessed and one end is inclined. An adjusting ring plate is fitted over the outside of the air inlet. By moving the position of the adjusting ring plate, the adjusting ring plate is tightly connected to the inclined part of the air inlet, so that the adjusting ring plate is locked or fitted at different positions of the air inlet.

[0008] Preferably, a fixing plate is fixedly connected to the outer wall of the adjusting ring plate, and an adjusting rod is fixedly connected to one side of the fixing plate; the fixing plate and the adjusting rod facilitate manual adjustment of the adjusting ring plate.

[0009] Preferably, one side of the supplementary combustion lifting air device is provided with an adjustment component for adjusting the air inlet angle. The adjustment component includes a bushing, a threaded cylinder and a lead screw. The bushing is hinged to the outer wall of the combustion furnace. One end of the threaded cylinder is connected to the inside of the bushing through a bearing, and the other end is threaded to the lead screw. One end of the lead screw is hinged to the outer wall of the air inlet cylinder.

[0010] With the bushing and bearing in place, the screw can be rotated independently by rotating the threaded cylinder. When the threaded cylinder rotates, one end of the screw is threadedly connected to the threaded cylinder, and the other end is hinged to the outer wall of the air inlet duct. One end of the air inlet duct is limited to the outer wall of the combustion furnace, so the screw can be unscrewed by rotating the threaded cylinder, and the air inlet duct rotates around one end of the screw as a base point.

[0011] Preferably, one end of the supplementary combustion lifting air device is provided with a protractor assembly for measuring angles. The protractor assembly includes a mounting plate, which is fixedly installed on the outer wall of the combustion furnace. One end of the air inlet duct is rotatably connected to the mounting plate via a rotating shaft. The rotating shaft and the mounting plate are connected by a bearing. One end of the rotating shaft passes through the mounting plate and is integrally connected with a snap-fit ​​connector. One end of the air inlet duct is connected to the mounting plate via the rotating shaft, thereby facilitating the adjustment of the air direction angle at one end of the air inlet duct, i.e., the air outlet end.

[0012] The clamp connector has a clamp sleeve and a protractor on one side. The clamp sleeve is rotatably connected to the protractor. The clamp sleeve and the protractor are connected by a bearing. One end of the clamp sleeve is clamped to the outside of the clamp connector, and the other end is fixedly connected to a pointer, which points to the scale direction of the protractor. By clamping the clamp sleeve to the clamp connector, the air inlet duct can be rotated to adjust the air inlet angle, and the clamp connector will drive the clamp sleeve to rotate together.

[0013] Preferably, one end of the connector and one end of the sleeve are both configured as regular polygonal structures. The sleeve rotates with the connector, causing the pointer to point to the corresponding scale on the protractor. The regular polygonal structure of the connector and sleeve facilitates the engagement of the protractor, sleeve, pointer, and connector. Initially, when the sleeve is engaged with the connector, the pointer points to the zero mark on the protractor. Once the air inlet is adjusted, the pointer points to different scales on the protractor, providing intuitive feedback.

[0014] Preferably, the air outlet of the air inlet duct faces the interior of the combustion furnace, and an elastic sealing sleeve is fixedly installed between the air inlet duct and the combustion furnace for connection; the elastic sealing sleeve has properties such as high temperature resistance and high elasticity, which facilitates the adjustment of the air outlet direction when the angle of the air inlet duct is adjusted.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This counter-current combustion supplementary air lifting device, by setting up a supplementary air lifting device in the lower layer of the combustion furnace, can not only make up for the insufficient range of the burner and meet the air supplementation needs of the burner, but also better organize the flow field, lift the pulverized coal of the lower burner, prevent the pulverized coal from sinking, and supplement oxygen in time, thereby improving the combustion rate of fly ash in the furnace, thus improving the efficiency of the boiler burner, reducing the carbon content of fly ash, and reducing NO emissions.

[0017] This offset combustion supplementary combustion lifting air device can adjust the ratio of supplementary combustion lifting air to burnout air by adjusting the air volume of the supplementary combustion lifting air device, which can further improve the air classification effect and reduce NO emissions. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the left side of the overall structure of the present invention.

[0020] Figure 3 A three-dimensional structural diagram of the supplementary combustion lifting air device.

[0021] Figure 4 A schematic diagram of the main structure of the supplementary combustion lifting air device.

[0022] Figure 5 This is a three-dimensional structural diagram of the burner.

[0023] Figure 6 A schematic diagram of the main structure of the supplementary combustion lifting air device, adjustment component, and angle measuring component.

[0024] Figure 7 This is a top view of the air inlet duct and the angle measuring assembly.

[0025] in:

[0026] 1-Combustion furnace; 2-Burner; 3-Supplemental combustion lifting air device; 301-Air inlet duct; 302-Air inlet; 303-Adjusting ring plate; 304-Adjusting rod; 305-Fixing plate; 306-Air outlet; 4-Elastic sealing sleeve; 5-Adjusting assembly; 501-Shaft sleeve; 502-Threaded cylinder; 503-Lead screw; 6-Protractor assembly; 601-Protractor plate; 602-Pointer; 603-Clad sleeve; 604-Mounting plate; 605-Rotating shaft; 606-Clad connector. Implementation

[0027] 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, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and 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 this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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.

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention. Example

[0030] Please see Figure 1-5 A counter-firing combustion supplementary combustion lifting air device includes a supplementary combustion lifting air device 3. The supplementary combustion lifting air device 3 is used in conjunction with a combustion furnace 1 and a burner 2. The supplementary combustion lifting air device 3 is located on the lower layer of the combustion furnace 1, and the burner 2 is located above the supplementary combustion lifting air device 3 and is fixedly installed on the combustion furnace 1.

[0031] The supplementary combustion lifting air device 3 includes an air inlet duct 301, which has an air inlet 302 and an air outlet 306. Air enters the air inlet duct 301 through the air inlet 302, and air enters the combustion furnace 1 through the air outlet 306. The air outlet 306 of the air inlet duct 301 faces the inside of the combustion furnace 1. An elastic sealing sleeve 4 is fixedly installed between the air inlet duct 301 and the combustion furnace 1 for connection. The elastic sealing sleeve 4 has properties such as high temperature resistance and high elasticity, which makes it easy to adjust the direction of the air outlet 306 when the angle of the air inlet duct 301 is adjusted.

[0032] The outer wall of the air inlet duct 301 is fitted with an adjusting ring plate 303 for adjusting the air intake volume of the air inlet 302. The air intake volume of the air inlet 302 is adjusted by changing the blocking area of ​​the adjusting ring plate 303 on the air inlet 302.

[0033] Two air inlets 302 are provided on the air inlet duct 301. The air inlets 302 are recessed and one end is inclined. The adjusting ring plate 303 is sleeved on the outside of the air inlet 302. By moving the position of the adjusting ring plate 303, the adjusting ring plate 303 is tightly connected to the inclined part of the air inlet 302, so that the adjusting ring plate 303 is locked or sleeved at different positions of the air inlet 302.

[0034] A fixing plate 305 is fixedly connected to the outer wall of the adjusting ring plate 303, and an adjusting rod 304 is fixedly connected to one side of the fixing plate 305; the fixing plate 305 and the adjusting rod 304 facilitate manual adjustment of the adjusting ring plate 303.

[0035] Specifically, in use, the supplementary combustion lifting air device 3 and the burner 2 are located inside the air box. The air generated by the air box serves as the air intake source for the supplementary combustion lifting air device 3 and the burner 2. By adjusting the position of the air inlet 302 that is clamped or sleeved on the air inlet duct 301 by the ring plate 303, the air intake volume of the supplementary combustion lifting air can be adjusted and used in conjunction with the burner 2.

[0036] It should be noted that the specific structure of burner 2 can be referred to in the published (application number CN202310262445.6) dual adjustable wide load low nitrogen high efficiency swirl combustion device, which will not be described in detail here. Example

[0037] Please see Figure 1-6 Based on the above embodiments, the counter-firing combustion supplementary combustion lifting air device 3 has an adjustment component 5 for adjusting the air inlet angle on one side. The adjustment component 5 includes a bushing 501, a threaded cylinder 502 and a lead screw 503. The bushing 501 is hinged to the outer wall of the combustion furnace 1. One end of the threaded cylinder 502 is connected to the inside of the bushing 501 through a bearing, and the other end is threaded to the lead screw 503. One end of the lead screw 503 is hinged to the outer wall of the air inlet duct 301.

[0038] With the bushing 501 and bearing in place, the threaded cylinder 502 can be rotated independently. When the threaded cylinder 502 rotates, one end of the screw 503 is threadedly connected to the threaded cylinder 502, and the other end is hinged to the outer wall of the air inlet duct 301. One end of the air inlet duct 301 is limited to the outer wall of the combustion furnace 1. Thus, the screw 503 can be unscrewed by the rotation of the threaded cylinder 502, and the air inlet duct 301 rotates around one end of the screw 502 as a base point.

[0039] Specifically, in use, when it is necessary to adjust the air outlet direction of the air inlet duct 301 up and down, that is, to adjust the direction of the supplementary combustion lifting air towards the inside of the combustion furnace 1, one end of the air inlet duct 301 is hinged to the side wall of the combustion furnace 1, and the air outlet faces the inside of the combustion furnace 1. One side of the air inlet duct 301 is also hinged to the side wall of the combustion furnace 1 through the bushing 501, bearing, threaded cylinder 502 and lead screw 503. By rotating the threaded cylinder 502, since one end of the lead screw 503 is threadedly connected to the threaded cylinder 502 and the other end is hinged to the outer wall of the air inlet duct 301, and one end of the air inlet duct 301 is hinged to the side wall of the combustion furnace 1, the threaded cylinder 502 can rotate the lead screw 503 out of its interior, so that the air inlet duct 301 can rotate up and down around its hinged end as the base point, thereby adjusting the air outlet direction of the air inlet duct 301 up and down.

[0040] The solution in this embodiment can be selectively combined with solutions in other embodiments. Example

[0041] Please see Figure 1-7 Based on the above embodiments, the counter-firing combustion and supplementary combustion lifting air device 3 has a protractor 6 at one end for measuring angles. The protractor 6 includes a mounting plate 604, which is fixedly installed on the outer wall of the combustion furnace 1. One side wall of the air inlet duct 301 is rotatably connected to the mounting plate 604 via a rotating shaft 605. The side wall of the air inlet duct 301 is fixedly connected to the rotating shaft 605. The rotating shaft 605 and the mounting plate 604 are connected by a bearing. One end of the rotating shaft 605 passes through the mounting plate 604 and is integrally connected to a snap-fit ​​connector 606. One end of the air inlet duct 301 is connected to the mounting plate 604 via the rotating shaft 605, thereby facilitating the adjustment of the air direction angle at one end of the air inlet duct 301, i.e., the air outlet 306.

[0042] A retaining sleeve 603 and a protractor 601 are provided on one side of the retaining connector 606. The retaining sleeve 603 and the protractor 601 are rotatably connected. The retaining sleeve 603 and the protractor 601 are connected by a bearing. One end of the retaining sleeve 603 is locked to the outside of the retaining connector 606, and the other end is fixedly connected to a pointer 602, which points to the scale direction of the protractor 601. By engaging the retaining sleeve 603 with the retaining connector 606, the air inlet duct 301 can be rotated to adjust the air inlet angle, and the retaining connector 606 will drive the retaining sleeve 603 to rotate together.

[0043] It should be noted that when the ferrule 603 is outside the ferrule connector 606, one side of the protractor 601 is just in contact with the side wall of the combustion furnace 1, and the ferrule 603 causes the pointer 602 to point to the zero mark of the protractor 601.

[0044] Furthermore, one end of the connector 606 and one end of the sleeve 603 are both designed as regular polygonal structures. The sleeve 603 rotates with the connector 606, causing the pointer 602 to point to the corresponding scale on the protractor 601. The regular polygonal structure of the connector 606 and sleeve 603 facilitates the engagement of the protractor 601, sleeve 603, pointer 602, and connector 606. Initially, when the sleeve 603 is engaged with the connector 606, the pointer 602 points to the zero mark on the protractor 601. Once the air inlet duct 301 adjusts the airflow direction, the pointer 602 points to different scales on the protractor 601, providing intuitive feedback.

[0045] Specifically, in use, one end of the air inlet duct 301 is hinged to the side wall of the combustion furnace 1 via the mounting plate 604 and the rotating shaft 605. One end of the rotating shaft 605 passes through the mounting plate 604 and is integrally connected to the snap-fit ​​connector 606. The snap-fit ​​connector 606 is externally connected to the ferrule 603 and the protractor 601. The regular polygonal structure of the snap-fit ​​connector 606 and the ferrule 603 facilitates the snap-fit ​​between the ferrule 603 and the connector 606. At the same time, when the air inlet duct 301 and the snap-fit ​​connector 606 are rotated under the action of the adjusting component 5, the ferrule 603 and the pointer 602 can be rotated. Thus, the pointer 602 points to the scale of the protractor 601, allowing a direct view of how much angle has been adjusted. This facilitates unified adjustment of multiple groups or precise adjustment.

[0046] After adjusting the air outlet angle of the air inlet duct 301 in one set, record the angle. Then, remove the retainer 603 and the protractor 601 to adjust the air outlet angle of the air inlet duct 301 in the next set. Multiple sets can be used in combination.

[0047] The solution in this embodiment can be selectively combined with solutions in other embodiments.

[0048] The working principle and specific usage procedure of the counter-firing combustion supplementary combustion lifting air device:

[0049] The air volume and structure of the supplementary combustion lifting air: The lower-level supplementary combustion lifting air device only retains direct air and does not have swirling air; the lower-level supplementary combustion lifting air volume is designed to be about 15%, which is adjusted through the main air box door. Each supplementary combustion lifting air is equipped with a manual adjustment air volume to adjust the air distribution on the same floor.

[0050] Airflow adjustment: Total burnout air (including upper burnout air and lower supplementary combustion air) accounts for approximately 35%. The upper burnout air (two layers) and lower supplementary combustion air are reasonably allocated based on the test results;

[0051] Quantity and Arrangement: The lower layer of the front / rear wall afterburner is separately configured with a main air box, with air intake on both sides and a main air damper on both sides to control the total air pressure of the air box. The air dampers are controlled by start-up and operated remotely by DSC. The number of afterburner devices in a single layer is consistent with that of the upper layer burners.

[0052] Selection of the counter-current point for the supplementary combustion lifting air on the front and rear walls: The counter-current point for the supplementary combustion lifting air device on the front and rear walls is located about 0.8 to 1.5 meters below the intersection of the counter-current points of the lower burners on the front and rear walls; The location of the supplementary combustion lifting air device is directly below the lower burner, at a distance of not less than 2 meters, and with an inclination angle of about 20°, not exceeding 30°. The specific location can be reasonably selected according to the furnace structure, and the arrangement and inclination angle should be coordinated.

[0053] Adjustment of air volume on the same floor: By setting a manual adjustment ring plate (adjustment sleeve) on each individual afterburner lifting air device, the air volume of each individual afterburner lifting air device can be adjusted according to the air pressure and system resistance to meet the needs of each individual device.

[0054] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of this invention. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this invention, or equivalent structural, procedural, or functional transformations made using the description and drawings of this invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this invention.

Claims

1. A PCAC augmented lift device comprising an augmented lift device (3) characterised in that: The combustion supporting and lifting air device (3) is used by matching the combustion furnace (1) and the burner (2), and the combustion supporting and lifting air device (3) is arranged on the lower layer of the combustion furnace (1); The combustion supporting and lifting air device (3) comprises an air inlet cylinder (301), an air inlet (302) and an air outlet (306) are formed on the air inlet cylinder (301), air is introduced into the air inlet cylinder (301) through the air inlet (302), the air outlet (306) is arranged towards the direction of the hearth of the combustion furnace (1), and an adjusting ring plate (303) for adjusting the air inlet amount of the air inlet (302) is arranged on the outer wall of the air inlet cylinder (301); the air inlet amount of the air inlet (302) is adjusted by changing the shielding area of the adjusting ring plate (303) on the air inlet (302). An adjusting assembly (5) for adjusting the air inlet angle is arranged on one side of the combustion supporting and lifting air device (3), the adjusting assembly (5) comprises a shaft sleeve (501), a threaded cylinder (502) and a lead screw (503), the shaft sleeve (501) is hinged to the outer wall of the combustion furnace (1), one end of the threaded cylinder (502) is connected to the inside of the shaft sleeve (501) through a bearing, the other end is threadedly connected with the lead screw (503), and one end of the lead screw (503) is hinged to the outer wall of the air inlet cylinder (301). One end of the combustion supporting and lifting air device (3) is provided with an angle measuring assembly (6), the angle measuring assembly (6) comprises a mounting plate (604), the mounting plate (604) is fixedly installed on the outer wall of the combustion furnace (1), one end of the side wall of the air inlet cylinder (301) is rotatably connected to the mounting plate (604) through a rotating shaft (605), and one end of the rotating shaft (605) penetrates through the mounting plate (604) and is integrally connected with a clamping joint (606); A clamping sleeve (603) and an angle measuring plate (601) are arranged on one side of the clamping joint (606), the clamping sleeve (603) is rotatably connected with the angle measuring plate (601), one end of the clamping sleeve (603) is clamped outside the clamping joint (606), the other end is fixedly connected with a pointer (602), and the pointer (602) points to the scale direction of the angle measuring plate (601).

2. A device for providing the air for the post-combustion of the fuel in the afterburner of the afterburning of the gas turbine engine according to claim 1, characterized in that: Two air inlets (302) are formed on the air inlet cylinder (301), the air inlets (302) are arranged in a concave manner and one end is arranged in an inclined manner, the adjusting ring plate (303) is arranged outside the air inlets (302), the position of the adjusting ring plate (303) is moved, the adjusting ring plate (303) is tightly connected with the inclined part of the air inlets (302), and the adjusting ring plate (303) is clamped or sleeved at different positions of the air inlets (302).

3. The counter-firing combustion and afterburning lifting air device according to claim 1, characterized in that: The outer wall of the adjusting ring plate (303) is fixedly connected with a fixing plate (305), and one side of the fixing plate (305) is fixedly connected with an adjusting rod (304).

4. A device for providing the air for the post combustion boost of the combustion of the fuel in the combustion chamber of the engine according to claim 1, characterized in that: The card joint (606) is provided with a regular polygon structure at one end, and the card sleeve (603) is provided with a regular polygon structure at one end, the card sleeve (603) rotates along with the rotation of the card joint (606), so that the pointer (602) points to the corresponding scale on the protractor (601).

5. A device for providing the air for the post combustion boost of the combustion of the fuel in the combustion chamber of the engine according to claim 1, characterized in that: The air outlet (306) of the air inlet cylinder (301) faces the inside of the combustion furnace (1) hearth, and the elastic sealing sleeve (4) is fixedly installed between the air inlet cylinder (301) and the combustion furnace (1) for connection.

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