Soot blowing device and air supply soot blowing system of alkali recovery furnace

Abstract

The utility model provides a soot blowing device and an alkali recovery furnace air supply soot blowing system.The soot blowing device comprises an inner pipe, a soot blowing gun pipe and a sealing assembly, the sealing assembly comprises a sealing seat, the sealing seat comprises an end and a connecting part extending from one side of the end, and the sealing assembly further comprises a sealing piece and a sealing ring which are sequentially arranged in the connecting part; the sealing ring is arranged on the sealing seat, the sealing element is arranged between the inner pipe and the connecting part in a radial moving mode, and the soot blowing gun pipe is in threaded connection with the sealing seat and extrudes the sealing ring so that the follow-up sealing ring can tightly hold the outer peripheral wall of the inner pipe in a sealing mode. The soot blowing device has the advantages that in the connecting process, the sealing ring is extruded through the soot blowing gun pipe, and the sealing ring can tightly hold the outer peripheral wall of the inner pipe; effective dynamic air tightness is realized; according to the sealing assembly of the soot blowing device, the air tightness can be further enhanced by arranging the sealing piece, and the sealing piece can move in the radial direction of the inner pipe, so that abrasion caused by relative movement of the soot blowing gun pipe and the inner pipe is reduced, and the reliability and the sealing performance of the sealing assembly of the soot blowing device are improved.

Description

Technical Field

[0001] The present application relates to the technical field of boiler tools, and in particular to a sootblowing device and an air supply and sootblowing system for an alkali recovery furnace. Background Art

[0002] The alkali recovery furnace plays a vital role in the pulp production process. During the operation of the alkali recovery furnace, in order to effectively and stably burn, remove ash from the heated surface, ensure good heat transfer effect of the heated surface and unobstructed flue, and extend the operation cycle of the alkali recovery furnace, the air supply system and soot blowing system play a key role.

[0003] Currently, long, telescopic steam soot blowers are commonly used to remove accumulated ash from alkali recovery furnaces. The steam soot blower operates by moving the steam soot blower lance tube in a uniform, spiral axial motion toward the furnace, while the inner tube of the steam soot blower supplies sootblowing steam to the lance tube. Due to the high temperature and pressure of superheated steam, and the relative motion between the steam soot blower supply pipe and the lance tube, the sealing material between them is constantly in a complex working state. During operation, eccentricity, radial, or axial displacement of the steam soot blower supply pipe or lance tube can easily cause lance tube jamming, seal wear, and increased sealing gaps, leading to steam leakage. Utility Model Content

[0004] An embodiment of the present application provides a sootblowing device, comprising an inner tube and a sootblowing gun barrel sleeved on the outside of the inner tube, the sootblowing gun barrel can move in an axial spiral manner along the inner tube, a sealing assembly is arranged between the sootblowing gun barrel and the inner tube, the sealing assembly includes a sealing seat, the sealing seat includes an end portion and a connecting portion extending from one side of the end portion, the sealing assembly also includes a sealing member and a sealing ring arranged in sequence in the connecting portion along the extension direction of the connecting portion, the sealing member can be radially movably arranged between the inner tube and the connecting portion, the sootblowing gun barrel is threadedly connected to the sealing seat and squeezes the sealing ring so that the follow-up sealing ring hugs the outer circumferential wall of the inner tube.

[0005] In some embodiments, the inner diameter of the inner tube is in the range of 120 to 130 mm.

[0006] In some embodiments, a fixed partition is provided on the inner wall of the connecting portion, and the fixed partition and the end of the sealing seat are combined to form a sealing chamber, and the sealing member is provided in the sealing chamber.

[0007] In some embodiments, the seal includes a spring and three follower sealing blocks arranged around the outer wall of the inner tube. The spring is sleeved on the outer periphery of each follower sealing block so that each follower sealing block always has a tendency to be tightly attached to the outer wall of the inner tube.

[0008] In some embodiments, a guide block and a guide groove are provided between the fixed partition and each of the follower sealing blocks, and the guide block and the guide groove extend radially along the inner tube. The guide block is provided on one of the fixed partition and the follower sealing block, and the guide groove is provided on the other, and the guide block and the guide groove are slidably fitted.

[0009] In some embodiments, the sealing ring is arranged on the side of the fixed partition away from the sealing member, and a follower partition is provided between the sealing ring and the end of the sootblowing gun barrel. When the sootblowing gun barrel is threadedly connected to the sealing seat, the sootblowing gun barrel can squeeze the sealing ring through the follower partition.

[0010] In some embodiments, the inner wall of the sealing ring is provided with spiral guide lines, and the spiral direction of the spiral guide lines is consistent with the rotation direction of the sootblowing gun barrel during movement.

[0011] In some embodiments, the sealing elements and the fixed partitions are provided in two groups, wherein any follower sealing block in one group of sealing elements at least partially overlaps with two adjacent follower sealing blocks in the other group of sealing elements.

[0012] In some embodiments, an air supply and soot blowing system for an alkali recovery furnace is provided, comprising a boiler body and the above-mentioned soot blowing device, wherein the side wall of the boiler body is arranged with a primary air supply assembly, a secondary air supply assembly, a black liquor spray gun and a tertiary air supply assembly in sequence from bottom to top, and the soot blowing device is inserted into the boiler body through an opening on the side wall of the boiler body.

[0013] In some embodiments, the air inlet of the primary air supply assembly is arranged around the boiler body, the air inlet of the secondary air supply assembly is arranged on opposite sides of the boiler body, the air inlet of the tertiary air supply assembly is arranged on opposite sides of the boiler body, and the air inlets of the tertiary air supply assembly and the secondary air supply assembly are staggered with each other.

[0014] The sootblowing device provided in the embodiment of the present application is threadedly connected to the sealing seat through the sootblowing gun barrel, which is convenient for fixing the sootblowing gun barrel and the sealing seat. During the connection process, the sealing ring is squeezed to make the sealing ring hug the outer circumferential wall of the inner tube. When the sootblowing gun barrel moves spirally relative to the inner tube, the gas cannot leak from the gap between the sootblowing gun barrel and the inner tube, thereby achieving effective dynamic air tightness; the air tightness can be further enhanced by arranging a sealing member, and since the sealing member can move radially along the inner tube, when the sootblowing gun barrel or the inner tube is eccentric, radially jumps, or moves axially, the sealing member can follow the movement, thereby reducing the wear caused by the relative movement of the sootblowing gun barrel and the inner tube, and improving the reliability and sealing of the sealing assembly of the sootblowing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 This is a structural diagram of an air supply and soot blowing system for an alkali recovery furnace according to an embodiment of the present application;

[0017] Figure 2 yes Figure 1 A schematic structural diagram of a primary air supply assembly in an embodiment;

[0018] Figure 3 yes Figure 1 A schematic structural diagram of a sootblowing device in an embodiment;

[0019] Figure 4 yes Figure 3 A schematic structural diagram of the sealing assembly in the embodiment;

[0020] Figure 5 yes Figure 4 Schematic diagram of the connection relationship between the sealing member and the sealing seat in the embodiment;

[0021] Figure 6 yes Figure 4 Schematic diagram of the connection relationship between the sealing member and the fixed partition in the embodiment;

[0022] Figure 7 yes Figure 4 Schematic diagram of the internal structure of the sealing ring in the embodiment. DETAILED DESCRIPTION

[0023] The present application will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only intended to illustrate the present application and are not intended to limit the scope of the present application. Similarly, the following examples are only some examples of the present application and not all examples. All other examples obtained by those of ordinary skill in the art without creative work are intended to fall within the scope of protection of this application.

[0024] The terms "first", "second" and "third" in the embodiments of the present application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second" and "third" may explicitly or implicitly include at least one of such features. In the description of the present application, "multiple" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined. All directional indications in the embodiments of the present application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "including" and "having" in the embodiments of the present application and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or components inherent to these processes, methods, products or devices.

[0025] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] See also Figure 1 An embodiment of the present application provides an air supply and soot blowing system for an alkali recovery furnace, comprising a boiler body 20 and a soot blowing device 10. The side walls of the boiler body 20 are arranged from bottom to top with a primary air supply assembly 30, a secondary air supply assembly 40, a black liquor spray gun 60, and a tertiary air supply assembly 50. The soot blowing device 10 is supported by a beam body 13, which is a box-cover-type component. The soot blowing device 10 is installed inside the beam body 13 and penetrates into the boiler body 20 through an opening on the side wall of the boiler body 20. The air inlet of the primary air supply assembly 30 is arranged around the boiler body 20, the air inlet of the secondary air supply assembly 40 is arranged on opposite sides of the boiler body 20, and the air inlet of the tertiary air supply assembly 50 is arranged on opposite sides of the boiler body 20, and the air inlets of the tertiary air supply assembly 50 and the secondary air supply assembly 40 are arranged alternately.

[0027] See also Figure 2 , Figure 2 yes Figure 1Schematic diagram of the structure of the primary air supply assembly in an embodiment. The primary air supply assembly 30, secondary air supply assembly 40, and tertiary air supply assembly 50 each include a muffler 31, a regulating valve 32, a reducer 33, and a motor 34, which are connected in sequence. The primary air supply assembly 30 and the secondary air supply assembly 40 also include a preheater 35, which is connected to the air outlet of the fan 37 via a pipe 36.

[0028] The primary air supply assembly 30 receives ambient air from a muffler 31, controls the air volume through a regulating valve 32, increases its kinetic energy through a fan 37, and then passes through a preheater 35, raising the air temperature to 160-175°C. The air then enters the furnace of the boiler body 20 through vents on all four walls, stabilizing the hearth and providing the oxygen required for combustion in a reducing state. The air distribution ratio is controlled at approximately 39%.

[0029] Regarding the secondary air supply assembly 40, normal temperature air enters from the muffler 31 and is controlled by the regulating valve 32. The kinetic energy is increased by the fan 37, and the air temperature is raised to 160-175°C through the preheater 35. The air enters the furnace on both sides below the black liquor spray gun 60 to dry the black liquor, provide the oxygen required for combustion, and further control the hearth. The air distribution ratio is controlled at approximately 42%.

[0030] Regarding the tertiary air supply assembly 50, normal temperature air enters from the muffler 31 and is controlled by the regulating valve 32. The kinetic energy is increased by the fan 37 and enters the furnace on the front and rear sides above the black liquor spray gun 60, helping to fully burn the residual gas and reduce fly ash. The air distribution ratio is controlled at approximately 19%.

[0031] The hot flue gas generated by the combustion of organic matter in black liquor Figure 1 The water flows in the direction A, and undergoes indirect heat exchange through the heating surfaces of the water-cooled panel 70, boiling tube panel 80 and economizer 90 to produce steam for use in the evaporation station.

[0032] The sootblowing device 10 includes an inner tube 11 and a sootblowing lance 12 sleeved on the outside of the inner tube 11. The sootblowing lance 12 can move in a spiral along the axial direction of the inner tube 11 to enter the boiler body 20. A nozzle 14 is provided on the tube wall of the sootblowing lance 12, which rotates with the sootblowing lance 12 to enter the boiler body 20. Steam is ejected from the nozzle 14 to remove the accumulated soot on the heating surfaces of various structures in the boiler body 20, such as the water-cooled screen 70, the boiling tube screen 80 and the economizer 90.

[0033] See also Figure 3 , Figure 3 yes Figure 1A schematic diagram of the sootblowing device in an embodiment. The sootblowing device 10 also includes an actuator 15, a poppet valve 16, and a steam pipe 17. The inner pipe 11 is a highly polished stainless steel tube. The poppet valve 16 is connected to the steam pipe 17. One end of the inner pipe 11 is connected to the poppet valve 16, and the other end extends into the sootblowing lance 12, thereby delivering the sootblowing medium to the lance 12. The actuator 15 is a key component of the sootblowing device 10. In this embodiment, the actuator 15 is a running machine. After the sootblower is activated, the motor drives the running machine forward along the guide rails on both sides of the beam 13, rotating the sootblowing lance 12 at a constant speed into the boiler. After the nozzle 14 has entered the furnace a certain distance, the running machine opens its valve, allowing steam to enter the inner pipe 11 and the sootblowing lance 12 through the poppet valve 16, and sootblowing begins. The running machine continues to advance, causing the sootblowing lance 12 to rotate and advance, blowing soot until it reaches its front limit. The motor then reverses, causing the running machine to retract, and the sootblowing lance 12 to retreat and blow soot at a different trajectory than when it advanced. When the nozzle 14 approaches the furnace wall, the valve closes and the soot blowing stops. The sports car continues to move backward and returns to the starting position. The specific structure of the sports car driving the soot blowing gun barrel 12 to move spirally is a conventional structure familiar to those skilled in the art and will not be described in detail here.

[0034] See also Figure 4 , Figure 4 yes Figure 3 Schematic diagram of the sealing assembly structure in an embodiment. A sealing assembly 18 is disposed between the sootblowing lance tube 12 and the inner tube 11. The sealing assembly 18 includes a sealing seat 181, which includes an end 1811 and a connecting portion 1812 extending from one side of the end 1811. The end 1811 of the sealing member 182 has a through hole to allow the inner tube 11 to pass through. The connecting portion 1812 of the sealing member 182 also has a through hole to allow the connecting portion 1812 to be screwed together with the sootblowing lance tube 12. It should be noted that the diameter of the through hole in the end 1811 is slightly larger than the outer diameter of the inner tube 11 to prevent jamming when the connecting portion 1812 and the sealing seat 181 move relative to each other. The sealing assembly 18 also includes a sealing member 182 and a sealing ring 183 which are sequentially arranged in the connecting portion 1812 along the extension direction of the connecting portion 1812. The sealing member 182 is radially movably arranged between the inner tube 11 and the connecting portion 1812. The sootblowing gun barrel 12 is threadedly connected to the connecting portion 1812 of the sealing seat 181 and squeezes the sealing ring 183 so that the follow-up sealing ring 183 hugs the outer peripheral wall of the inner tube 11.

[0035] The sootblowing gun barrel 12 is threadedly connected to the sealing seat 181, which facilitates the fixation of the sootblowing gun barrel 12 and the sealing seat 181. During the connection process, the sealing ring 183 is squeezed so that the sealing ring 183 hugs the outer wall of the inner tube 11. When the sootblowing gun barrel 12 moves spirally relative to the inner tube 11, the gas cannot leak from the gap between the sootblowing gun barrel 12 and the inner tube 11, thereby achieving effective dynamic air tightness; the air tightness can be further enhanced by providing the sealing member 182, and since the sealing member 182 can move radially along the inner tube 11, when the sootblowing gun barrel 12 or the inner tube 11 is eccentric, radially jumps, or moves axially, the sealing member 182 can follow the movement, thereby reducing the wear caused by the relative movement of the sootblowing gun barrel 12 and the inner tube 11, and improving the reliability and sealing of the sealing assembly 18 in the sootblowing device 10.

[0036] In particular, the inner diameter of the inner tube 11 ranges from 120 to 130 mm, and for example, the inner diameter of the inner tube 11 is 125 mm. The conventional inner diameter of the inner tube 11 is 50 mm. In this embodiment, by increasing the inner diameter of the inner tube 11, the steam flow rate can be increased, the steam pressure during soot blowing can be enhanced, and the radius of steam ejected from the soot blowing gun tube 12 can be increased. The alkali recovery furnace air supply soot blowing system in this embodiment controls the total air volume to be 3100 m 3 / TDS, set the air distribution ratios of primary air, secondary air, and tertiary air to 39%, 42%, and 19% respectively. By optimizing the air distribution ratios, the stability of black liquor combustion can be improved and the fly ash after black liquor combustion can be reduced. By increasing the soot blowing radius and steam pressure, the soot blowing effect can be improved, the ash accumulation rate can be slowed down, the flue can be kept unobstructed, and the operation cycle can be extended.

[0037] See also Figure 4 as well as Figure 5 , Figure 5 yes Figure 4 Schematic diagram of the connection between the seal and the sealing seat in the embodiment. Specifically, a fixed partition 184 is provided on the inner wall of the connecting portion 1812. The fixed partition 184 is fixedly connected to the connecting portion 1812. The fixed partition 184 and the end 1811 of the sealing seat 181 enclose a sealed chamber 185, and the seal 182 is disposed within the sealed chamber 185. The seal 182 includes a spring 1821 and three follower seal blocks 1822 arranged around the outer circumference of the inner tube 11. The spring 1821 is mounted on the outer circumference of each follower seal block 1822, ensuring that each follower seal block 1822 always has a tendency to closely adhere to the outer circumference of the inner tube 11.

[0038] See also Figure 4 as well as Figure 6 , Figure 6 yes Figure 4Schematic diagram of the connection between the seal and the fixed partition in this embodiment. A guide block 186 and a guide groove 187 are provided between the fixed partition 184 and each follower seal block 1822. The guide block 186 and the guide groove 187 extend radially along the inner tube 11. The guide block 186 is provided on one of the fixed partition 184 and the follower seal block 1822, while the guide groove 187 is provided on the other. The guide block 186 and the guide groove 187 slidably engage with each other. This embodiment uses the guide block 186 provided on the fixed partition 184 as an example. Three guide blocks 186 are provided, and the three guide blocks 186 are arranged in a circumferential array on the fixed partition 184. A guide groove 187 is provided in the center of each follower seal block 1822. The guide grooves 187 on the three follower seal blocks 1822 correspond one-to-one with the three guide blocks 186 and cooperate with each other to enable the three follower seal blocks 1822 to move radially along the inner tube 11. The radially movable range of the sealing ring 183 prevents jamming due to eccentricity and radial runout to a certain extent. Furthermore, by installing a spring 1821 around the outer periphery of each follower seal block 1822, the elastic force of the spring 1821 allows the follower seal block 1822 to adhere tightly to the outer wall of the inner tube 11, thereby improving the sealing performance of the follower seal block 1822.

[0039] See also Figure 4 The sealing ring 183 is positioned on the side of the fixed partition 184 away from the sealing element 182. A follower partition 188 is disposed between the sealing ring 183 and the end 1811 of the lance tube 12. It should be noted that both the fixed partition 184 and the follower partition 188 have through-holes for the inner tube 11 to pass through, and the diameter of these through-holes is slightly larger than the outer diameter of the inner tube 11. When the lance tube 12 is threadedly connected to the sealing seat 181, the lance tube 12 can squeeze the sealing ring 183 through the follower partition 188. The sealing ring 183 is made of an elastically deformable material, while the follower partition 188 and the fixed partition 184 are both made of rigid material. When the lance tube 12 is threadedly connected to the connecting portion 1812, the two side surfaces of the sealing ring 183 can partially deform under the pressure of the follower partition 188 and the fixed partition 184, achieving a radial seal. At the same time, under the pressure of the follower partition 188 and the fixed partition 184, the inner circumferential wall of the sealing ring 183 can hug the outer circumferential wall of the inner tube 11 to achieve axial sealing.

[0040] See also Figure 7 , Figure 7 yes Figure 4Schematic diagram of the internal structure of the sealing ring in an embodiment. In some embodiments, the inner wall of the sealing ring 183 is provided with a spiral guide groove 1831, and the spiral direction of the spiral guide groove 1831 is consistent with the rotation direction of the sootblowing lance tube 12 during movement. Because the sealing ring 183 is squeezed and fixed by the follower partition 188 and the fixed partition 184, the contact area between the end faces of the sealing ring 183 and the follower partition 188 and the fixed partition 184 is greater than the contact area between the inner ring side of the sealing ring 183 and the outer peripheral wall of the inner tube 11. As a result, the sealing ring 183 and the sealing seat 181 are relatively stationary, while the sealing seat 181 and the sootblowing lance tube 12 axially spirally move relative to the inner tube 11, so that the sealing ring 183 axially spirally moves relative to the inner tube 11. In order to reduce the wear caused by the movement of the sealing ring 183 relative to the inner tube 11, the spiral guide groove 1831 is provided on the inner wall of the sealing ring 183, and the spiral direction of the spiral guide groove 1831 is consistent with the rotation direction of the sootblowing lance tube 12 during movement. The rotation and axial movement between the sealing ring 183 and the inner tube 11 are made to follow the spiral guide groove 1831 , thereby effectively reducing the wear of the sealing surface.

[0041] In some embodiments, two sets of seals 182 and fixed partitions 184 are provided, wherein any follower seal block 1822 in one set of seals 182 at least partially overlaps with two adjacent follower seal blocks 1822 in the other set of seals 182. In this embodiment, the two sets of seals 182 and the sealing ring 183 are sequentially arranged along the extension direction of the connecting portion 1812. Because there is a gap between two adjacent follower seal blocks 1822 in the seals 182, by providing two sets of seals 182 and ensuring that any follower seal block 1822 in one set of seals 182 at least partially overlaps with two adjacent follower seal blocks 1822 in the other set of seals 182, the two sets of seals 182 can compensate for each other's gap, thereby improving airtightness.

[0042] The above descriptions are only some embodiments of the present application and do not limit the scope of protection of the present application. Any equivalent device or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of this application.

Claims

1. A sootblowing device, characterized in that: The lance tube includes an inner tube and a sootblowing gun barrel sleeved on the outside of the inner tube, the sootblowing gun barrel can move spirally along the axial direction of the inner tube, a sealing assembly is arranged between the lance tube and the inner tube, the sealing assembly includes a sealing seat, the sealing seat includes an end portion and a connecting portion extending from one side of the end portion, the sealing assembly also includes a sealing member and a sealing ring arranged in sequence in the connecting portion along the extending direction of the connecting portion, the sealing member can be radially movably arranged between the inner tube and the connecting portion, the lance tube is threadedly connected to the sealing seat and squeezes the sealing ring so that the sealing ring hugs the outer circumferential wall of the inner tube.

2. The sootblowing device according to claim 1, characterized in that The inner diameter of the inner tube ranges from 120 to 130 mm.

3. The sootblowing device according to claim 1 or 2, characterized in that: A fixed partition is provided on the inner wall of the connecting portion. The fixed partition and the end of the sealing seat are enclosed to form a sealing chamber. The sealing member is provided in the sealing chamber.

4. The sootblowing device according to claim 3, characterized in that The sealing member includes a spring and three follower sealing blocks arranged around the outer peripheral wall of the inner tube. The spring is sleeved on the outer periphery of each follower sealing block so that each follower sealing block always has a tendency to be tightly attached to the outer peripheral wall of the inner tube.

5. The sootblowing device according to claim 4, characterized in that A guide block and a guide groove are provided between the fixed partition and each of the follower sealing blocks. The guide block and the guide groove extend along the radial direction of the inner tube. The guide block is provided on one of the fixed partition and the follower sealing block, and the guide groove is provided on the other. The guide block and the guide groove are slidably fitted.

6. The sootblowing device according to claim 4, characterized in that The sealing ring is arranged on a side of the fixed partition away from the sealing member, and a follower partition is provided between the sealing ring and the end of the sootblowing gun tube. When the sootblowing gun tube is threadedly connected to the sealing seat, the sootblowing gun tube can squeeze the sealing ring through the follower partition.

7. The sootblowing device according to claim 6, characterized in that The inner wall of the sealing ring is provided with spiral guide lines, and the spiral direction of the spiral guide lines is consistent with the rotation direction of the sootblowing gun barrel during movement.

8. The sootblowing device according to claim 4, characterized in that The sealing elements and the fixed partitions are provided in two groups, wherein any follower sealing block in one group of sealing elements at least partially overlaps with two adjacent follower sealing blocks in the other group of sealing elements.

9. An air supply and soot blowing system for an alkali recovery furnace, characterized in that: It comprises a boiler body and a sootblowing device as described in any one of claims 1 to 8, wherein the side wall of the boiler body is sequentially arranged from bottom to top with a primary air supply assembly, a secondary air supply assembly, a black liquor spray gun and a tertiary air supply assembly, and the sootblowing device is inserted into the boiler body through an opening on the side wall of the boiler body.

10. The air supply and soot blowing system for an alkali recovery furnace according to claim 9, characterized in that: The air inlet of the primary air supply assembly is arranged around the boiler body, the air inlet of the secondary air supply assembly is arranged on opposite sides of the boiler body, and the air inlet of the tertiary air supply assembly is arranged on opposite sides of the boiler body, and the air inlets of the tertiary air supply assembly and the secondary air supply assembly are arranged in an interlaced manner.

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