Novel strong penetration jet flow structure secondary air burner suitable for circulating fluidized bed boiler

Abstract

The utility model relates to the field of circulating fluidized bed boilers, and discloses a novel strong-penetration jet flow structure secondary air burner suitable for a circulating fluidized bed boiler, which comprises a secondary air pipe, an auxiliary air pipe is fixedly arranged in the secondary air pipe, and one end of the secondary air pipe and one end of the auxiliary air pipe are respectively and fixedly connected with one end of the inner wall of the boiler. A plurality of adjusting assemblies are fixedly installed on the outer side of the secondary air pipe, a partition assembly is fixedly installed in an annular area defined by the inner side of the secondary air pipe and the outer side of the auxiliary air pipe, an inner movable plate is rotationally connected into the auxiliary air pipe, and an inclined adjusting assembly fixedly connected with one end of the inner movable plate is fixedly installed on the outer wall of the secondary air pipe. The secondary air burner can be continuously put into use when the boiler runs in an ultra-low load mode, the normal function of the secondary air burner can be achieved, the burn-off rate is increased, the boiler combustion stability is guaranteed, the secondary air disturbance strengthening and burnout assisting functions are achieved under the low-load working condition of the boiler, the generation amount of NOx in the boiler is reduced to the maximum extent, and the environmental protection index requirement is met.

Description

Technical Field

[0001] The invention relates to the field of circulating fluidized bed boilers, in particular to a novel secondary air burner with a strong penetrating permeation structure suitable for circulating fluidized bed boilers. Background Art

[0002] As circulating fluidized bed (CFB) boilers become larger and more highly parameterized, furnace heights continue to increase, posing challenges to the boiler foundation, structural layout, and manufacturing costs. Properly designing the heating surface of the boiler furnace after larger CFB boilers becomes a must-solve issue. Furthermore, because the jet momentum of the secondary air in CFB boilers is relatively small compared to the fluidization momentum of the dense-phase bed material, the secondary air in CFB boilers with ever-increasing furnace cross-sectional areas has difficulty reaching the center of the furnace, resulting in an oxygen-deficient center. Experiments have shown that oxygen deficiency in the furnace center is common in large circulating fluidized bed boilers, leading to incomplete fuel combustion, particularly high levels of combustible fly ash in the boiler, which reduces the combustion efficiency of the CFB boiler. Therefore, the issue of insufficient secondary air penetration in larger CFB boilers also needs to be addressed.

[0003] For circulating fluidized bed boilers, in order to ensure the fluidization effect of the furnace bed when the boiler is running at ultra-low load, the primary air volume at the furnace bottom must be higher than the minimum air volume required for fluidization. This results in the primary air volume at the furnace bottom being much larger than the primary air volume required for combustion when the boiler is running at ultra-low load, which also results in a reduction in the secondary air volume when the boiler is running at ultra-low load. As a result, the secondary air rate and wind speed are difficult to meet the combustion design requirements, and the role of the secondary air cannot be fully realized, which directly affects the ultra-low load flexibility operation of the circulating fluidized bed boiler. For this reason, this new model proposes a new type of strong penetrating flow structure secondary air burner suitable for circulating fluidized bed boilers to solve the above problems. Utility Model Content

[0004] The purpose of this novel invention is to provide a new type of secondary air burner with strong penetrating flow structure suitable for circulating fluidized bed boilers, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a new type of strong penetrating permeation structure secondary air burner suitable for circulating fluidized bed boilers, comprising a secondary air duct, an auxiliary air duct is fixedly arranged inside the secondary air duct, and one end of the secondary air duct and the auxiliary air duct are respectively fixedly connected to one end of the inner wall of the boiler, a plurality of adjustment components are fixedly installed on the outside of the secondary air duct, and a partition component is fixedly installed in the annular area surrounded by the inner side of the secondary air duct and the outer side of the auxiliary air duct, an inner movable plate is rotatably connected inside the auxiliary air duct, and an oblique adjustment component fixedly connected to one end of the inner movable plate is fixedly installed on the outer wall of the secondary air duct; the partition component comprises a fixed partition plate arranged between the secondary air duct and the auxiliary air duct, and the fixed partition plate is a ring structure, the outer side and inner side of the fixed partition plate are respectively fixedly connected to the inner wall of the secondary air duct and the outer side of the auxiliary air duct, and a plurality of through grooves are opened on the surface of the fixed partition plate; each through groove of the fixed partition plate is respectively provided with an outer movable partition plate adapted to its shape, and each outer movable partition is in smooth contact with the inner wall of the through groove corresponding to the fixed partition plate.

[0006] Preferably, the oblique adjustment assembly and each adjustment assembly include an adjustment block fixedly connected to one end of the outer side of the secondary air duct, and the adjustment block is provided with a chamber.

[0007] Preferably, the adjusting block is rotatably connected with a rotating shaft along its center position, and a positioning block is fixedly connected in the adjusting block chamber, and the rotating shaft is rotatably connected with the center position of the positioning block.

[0008] Preferably, the rotating shaft of each adjusting assembly penetrates into the secondary air duct, passes through the fixed partition, extends into the corresponding fixed partition slot, and is plugged and fixed to the corresponding outer movable partition.

[0009] Preferably: several adjustment blocks of the adjustment components are distributed in a ring along the outer side of the secondary air duct, and the adjustment block of the oblique adjustment component is fixedly installed on the outer side of the secondary air duct between the adjustment blocks of two adjacent adjustment components, the rotating shaft of the oblique adjustment component passes through the secondary air duct, the fixed partition, and the auxiliary air duct rotation setting in sequence, and the rotating shaft of the oblique adjustment component is away from one end of its adjustment block and is plugged and fixed to the inner movable plate.

[0010] Preferably, the oblique adjustment assembly and the adjustment block of each adjustment assembly are respectively fixedly connected with four mutually perpendicular positioning cross bars on the outside of one end away from the secondary air duct, and each rotating shaft extends to the outside of the adjustment block away from one end of the secondary air duct and is fixedly connected with a bottom block.

[0011] Preferably, one end of each bottom block is fixedly connected to an adjustment rod arranged parallel to each positioning cross bar.

[0012] Preferably: each of the adjusting rods and each positioning cross bar is respectively provided with a fixing screw hole which cooperates with the thread of the limiting screw, and each adjusting rod is fixedly connected to a shift block at one end away from the bottom block, the secondary air blade angle of the burner is 0-45°, and each limiting screw is respectively arranged perpendicular to the positioning cross bar.

[0013] Compared with the existing technology, the new technology has the following beneficial effects:

[0014] When the boiler is running at ultra-low load, the staff can rotate the adjusting rod to drive the bottom block to rotate by toggling the adjusting block of the adjusting assembly, so that the rotating shaft can rotate, and further the outer movable partition can rotate, and the two oppositely arranged positioning cross bars are set to be perpendicular to each other with the fixed partition, so that when the adjusting rod rotates with the bottom block to the bottom end of the positioning cross bar perpendicular to the fixed partition, the adjusting rod is fixed to the corresponding positioning cross bar by the limit screw. At this time, the outer movable partition is perpendicular to the fixed partition, and then the same operation process is used to make the rotating shaft of the oblique adjustment assembly drive the inner movable plate to be set parallel to the fixed partition, so that the inner side of the auxiliary air duct is a closed structure, and the secondary air can only be blown into the furnace from the area between the secondary air duct and the auxiliary air duct, to ensure that the secondary air burner can be used when the boiler is running at ultra-low load. Continuing to use it can play the normal role of the secondary air burner, improve the burnout rate, and ensure the combustion stability of the boiler. Conversely, with the same operation, the outer movable partition and the fixed partition are adjusted to be parallel to each other by rotating the rotating shaft of the adjusting component, and the rotating shaft of the inclined adjusting component drives the inner movable plate to rotate the vertical position of the fixed partition, then the area between the secondary air duct and the auxiliary air duct is a closed structure, and the secondary air can only be blown into the furnace from the inside of the auxiliary air duct; at medium and high loads, the outer movable partition and the fixed partition are adjusted to be perpendicular to each other by rotating the rotating shaft of the adjusting component, and the rotating shaft of the inclined adjusting component drives the inner movable plate to rotate to a position perpendicular to the fixed partition, then the secondary air can be blown into the furnace from the inside of the auxiliary air duct and the area between the secondary air duct and the auxiliary air duct at the same time, without affecting the use effect of the secondary air at medium and high loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the new model;

[0016] Figure 2 This is an enlarged schematic diagram of the structure at A of the new model;

[0017] Figure 3 This is a schematic diagram of the side structure of the new model;

[0018] Figure 4 This is a structural diagram of Example 2;

[0019] Figure 5 This is a structural diagram of Example 3;

[0020] Figure 6This is a structural diagram of Example 4;

[0021] Figure 7 This is a structural diagram of Example 5;

[0022] Figure 8 This is a structural diagram of Example 6.

[0023] In the figure: 1. Secondary air duct; 2. Auxiliary air duct; 3. Adjustment assembly; 4. Partition assembly; 5. Inner movable plate; 6. Oblique adjustment assembly; 31. Adjustment block; 32. Rotating shaft; 33. Positioning block; 34. Bottom block; 35. Adjustment rod; 36. Dial block; 37. Positioning cross bar; 38. Limit screw; 41. Fixed partition; 42. Outer movable partition. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] Example 1

[0026] See also Figure 1-Figure 3 The figure shows a new type of strong penetrating flow structure secondary air burner suitable for circulating fluidized bed boilers, including a secondary air duct 1, an auxiliary air duct 2 is fixedly arranged inside the secondary air duct 1, and one end of the secondary air duct 1 and the auxiliary air duct 2 are respectively fixedly connected to one end of the inner wall of the boiler, an adjustment component 3 is fixedly installed on the outside of the secondary air duct 1, and a partition component 4 is fixedly installed in the annular area surrounded by the inner side of the secondary air duct 1 and the outer side of the auxiliary air duct 2, an inner movable plate 5 is rotatably connected inside the auxiliary air duct 2, and an oblique adjustment component 6 fixedly connected to one end of the inner movable plate 5 is fixedly installed on the outer wall of the secondary air duct 1.

[0027] In this embodiment, the oblique adjustment component 6 and the adjustment component 3 both include an adjustment block 31 fixedly connected to one end of the outer side of the secondary air duct 1, and the adjustment block 31 has a chamber, and the adjustment block 31 is rotatably connected along its center position with a rotating shaft 32, and a positioning block 33 is fixedly connected in the chamber of the adjustment block 31, and the rotating shaft 32 is rotatably connected to the center position of the positioning block 33; the partition component 4 includes a fixed partition 41 arranged between the secondary air duct 1 and the auxiliary air duct 2, and the fixed partition 41 is a ring structure, the outer and inner sides of the fixed partition 41 are respectively fixedly connected to the inner wall of the secondary air duct 1 and the outer side of the auxiliary air duct 2, and a through groove is opened on the surface of the fixed partition 41, and the through groove of the fixed partition 41 is provided with an external movable partition 42 whose shape is adapted thereto, and the external movable partition 42 is in smooth contact with the inner wall of the through groove corresponding to the fixed partition 41.

[0028] Furthermore, the rotating shaft 32 of the regulating assembly 3 penetrates into the secondary air duct 1, passes through the fixed partition 41, extends into the corresponding through groove of the fixed partition 41, and is plugged and fixed with the corresponding outer movable partition 42; wherein the rotating shaft 32 can rotate freely;

[0029] The adjusting block 31 of the adjusting assembly 3 is fixedly mounted on the outside of the air duct 1, and the adjusting block 31 of the oblique adjusting assembly 6 is fixedly mounted on the outside of the secondary air duct 1 on one side of the adjusting block 31 of the adjusting assembly 3. The rotating shaft 32 of the oblique adjusting assembly 6 passes through the secondary air duct 1, the fixed partition 41 and the auxiliary air duct 2 in sequence for rotation, and the rotating shaft 32 of the oblique adjusting assembly 6 is fixed to the inner movable plate 5 at one end away from its adjusting block 31.

[0030] Furthermore, the oblique adjustment component 6 and the adjustment block 31 of the adjustment component 3 are respectively fixedly connected to the outside of one end away from the secondary air duct 1 with four mutually perpendicular positioning cross bars 37, and the rotating shaft 32 extends to the outside of the adjustment block 31 away from one end of the secondary air duct 1 and is fixedly connected to the bottom block 34, and one end of the bottom block 34 is fixedly connected to an adjustment rod 35 arranged parallel to the positioning cross bar 37, and the adjustment rod 35 and the positioning cross bar 37 are respectively provided with fixing screw holes that threadably cooperate with the limiting screw 38, and the adjustment rod 35 is fixedly connected to the shift block 36 at one end away from the bottom block 34, and the limiting screws 38 are respectively arranged perpendicular to the positioning cross bar 37. At this time, the outer movable partition 42 and the inner movable plate 5 are both in a closed state.

[0031] Example 2

[0032] See also Figure 4 In this embodiment, the number of adjustment components 3 and external movable partitions 42 is two, and they are symmetrically distributed along the two sides of the secondary air duct 1. By providing two adjustment components 3 and external movable partitions 42, the problem of being unable to adjust when one of the external movable partitions 42 fails is avoided. At the same time, the provision of two external movable partitions 42 can also increase the adjustment range of the air volume. Figure 4 It is shown that at this time both the outer movable partition 42 and the inner movable panel 5 are in a closed state.

[0033] Example 3

[0034] See also Figure 5 In this embodiment, the number of the adjustment components 3 and the external movable partition 42 is set to four, and they are distributed in a ring shape along the outer side of the secondary air duct 1. By providing four adjustment components 3 and external movable partitions 42, the adjustment range of the secondary air volume is further increased, so that the operation of the adjustment process has more options. Figure 5 It is shown that at this time both the outer movable partition 42 and the inner movable panel 5 are in a closed state.

[0035] Example 4

[0036] See also Figure 6 In this embodiment, the shift block 36 of the oblique adjustment component 6 drives the adjustment rod 35 to rotate 90°. At this time, each outer movable partition 42 is still in a closed state, while the inner movable plate 5 is in an open state. When the boiler is running at ultra-low load, the outer movable partition 42 is adjusted to close the through slot on the fixed partition 41 by rotating the rotating shaft 32 of the adjustment component 3, and the rotating shaft 32 of the oblique adjustment component 6 drives the inner movable plate 5 to rotate to a position perpendicular to the fixed partition 41. Then, the area between the secondary air duct 1 and the auxiliary air duct 2 is a closed structure, and the secondary air can only be blown into the furnace from the inside of the auxiliary air duct 2.

[0037] Example 5

[0038] See also Figure 7 When the adjusting rod 35 is rotated with the bottom block 34 to the bottom end of the positioning cross bar 37 perpendicular to the fixed partition 41, the adjusting rod 35 is fixed to the corresponding positioning cross bar 37 by the limit screw 38. At this time, the outer movable partition 42 is perpendicular to the fixed partition 41. Then, the rotating shaft 32 of the inclined adjustment assembly 6 drives the inner movable plate 5 to be set parallel to the fixed partition 41 in the same operation process. Then, the inner side of the auxiliary air duct 2 is a closed structure. At the same time, the secondary air can only be blown into the furnace from the area between the secondary air duct 1 and the auxiliary air duct 2, ensuring that the secondary air burner can continue to be used when the boiler is running at ultra-low load. It can play the normal role of the secondary air burner, improve the burnout rate, and ensure the combustion stability of the boiler.

[0039] Example 6

[0040] See also Figure 8 In this embodiment, when the load is medium or high, the outer movable partition 42 and the fixed partition 41 are adjusted to be perpendicular to each other by rotating the rotating shaft 32 of the adjusting component 3, and the rotating shaft 32 of the inclined adjusting component 6 is adjusted to drive the inner movable plate 5 to rotate to a position perpendicular to the fixed partition 41. Then, the secondary air can be blown into the furnace from the inside of the auxiliary air duct 2 and the area between the secondary air duct 1 and the auxiliary air duct 2 at the same time, without affecting the use effect of the secondary air at medium or high loads.

[0041] Furthermore, for inferior coal with Vdaf≤15%, the coal quality is not easy to burn, and the required secondary air stiffness is large. The secondary air blade angle is set to 0-25°, the secondary air flow area is small, and the secondary air speed is high, thereby ensuring the penetration ability of the secondary air; for sub-bituminous coal with 16%≤Vdaf≤26%, the coal quality burns poorly, and the secondary air blade angle is set to 25-30°, ensuring a small secondary air flow area, thereby ensuring the penetration ability of the secondary air; for bituminous coal with 27%≤Vdaf≤40%, the coal quality is easier to burn, the secondary air speed is appropriately reduced, and a larger secondary air flow area can be appropriately retained, and the secondary air blade angle is set to 30-40°; for lignite with Vdaf≥40%, the coal quality is easy to burn, the secondary air speed requirement is low, and the secondary air blade angle is set to 40-45°, which can achieve the secondary air meeting the stable operation requirements when burning different coal qualities at ultra-low load operation.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel strong penetrating flow structure secondary air burner suitable for a circulating fluidized bed boiler, comprising a secondary air duct (1), characterized in that: An auxiliary air duct (2) is fixedly provided inside the secondary air duct (1), and one end of the secondary air duct (1) and the auxiliary air duct (2) are respectively fixedly connected to one end of the inner wall of the boiler; a plurality of adjustment components (3) are fixedly installed on the outer side of the secondary air duct (1); and a partition component (4) is fixedly installed in the annular area formed by the inner side of the secondary air duct (1) and the outer side of the auxiliary air duct (2); an inner movable plate (5) is rotatably connected inside the auxiliary air duct (2), and an oblique adjustment component (6) fixedly connected to one end of the inner movable plate (5) is fixedly installed on the outer wall of the secondary air duct (1); The partition assembly (4) comprises a fixed partition (41) arranged between the secondary air duct (1) and the auxiliary air duct (2), and the fixed partition (41) is an annular structure, the outer side and the inner side of the fixed partition (41) are respectively fixedly connected to the inner wall of the secondary air duct (1) and the outer side of the auxiliary air duct (2), and a plurality of through grooves are formed on the surface of the fixed partition (41); Each through slot of the fixed partition (41) is provided with an outer movable partition (42) having a shape adapted thereto, and each outer movable partition (42) is in smooth contact with the inner wall of the through slot corresponding to the fixed partition (41).

2. The novel strong penetrating flow structure secondary air burner suitable for a circulating fluidized bed boiler according to claim 1 is characterized by: The oblique adjustment assembly (6) and each adjustment assembly (3) comprise an adjustment block (31) fixedly connected to one end of the outer side of the secondary air duct (1), and the adjustment block (31) is provided with a chamber.

3. The novel strong penetrating flow structure secondary air burner suitable for a circulating fluidized bed boiler according to claim 2 is characterized by: The adjusting block (31) is rotatably connected to a rotating shaft (32) along its center position, and a positioning block (33) is fixedly connected in the chamber of the adjusting block (31), and the rotating shaft (32) is rotatably connected to the center position of the positioning block (33).

4. The novel strong penetrating flow structure secondary air burner suitable for a circulating fluidized bed boiler according to claim 3 is characterized by: The rotating shaft (32) of each regulating assembly (3) penetrates into the secondary air duct (1), passes through the fixed partition (41), extends into the corresponding fixed partition (41) through-slot, and is plugged and fixed to the corresponding outer movable partition (42).

5. The novel strong penetrating flow structure secondary air burner suitable for a circulating fluidized bed boiler according to claim 4 is characterized in that: The adjusting blocks (31) of the plurality of adjusting assemblies (3) are distributed in a ring shape along the outer side of the secondary air duct (1), and the adjusting block (31) of the oblique adjusting assembly (6) is fixedly installed on the outer side of the secondary air duct (1) between the adjusting blocks (31) of two adjacent adjusting assemblies (3). The rotating shaft (32) of the oblique adjusting assembly (6) sequentially passes through the secondary air duct (1), the fixed partition (41), and the auxiliary air duct (2) for rotational arrangement, and the rotating shaft (32) of the oblique adjusting assembly (6) away from the adjusting block (31) is plugged and fixed to the inner movable plate (5).

6. The novel strong penetrating flow structure secondary air burner suitable for a circulating fluidized bed boiler according to claim 5, characterized in that: The oblique adjustment assembly (6) and the adjustment block (31) of each adjustment assembly (3) are respectively fixedly connected to four mutually perpendicular positioning cross bars (37) on the outside of one end away from the secondary air duct (1), and each rotating shaft (32) extends to the outside of the adjustment block (31) away from one end of the secondary air duct (1) and is fixedly connected to a bottom block (34).

7. The novel strong penetrating flow structure secondary air burner suitable for a circulating fluidized bed boiler according to claim 6, characterized in that: One end of each bottom block (34) is fixedly connected to an adjusting rod (35) arranged parallel to each positioning cross rod (37).

8. The novel strong penetrating flow structure secondary air burner suitable for a circulating fluidized bed boiler according to claim 7, characterized in that: Each of the adjusting rods (35) and each of the positioning cross bars (37) is provided with a fixing screw hole threadedly matched with a limiting screw (38), and one end of each adjusting rod (35) away from the bottom block (34) is fixedly connected to a shift block (36), the angle of the secondary air blade of the burner is 0-45 degrees, and each limiting screw (38) is respectively arranged perpendicular to the positioning cross bar (37).

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