A spray ring for a desulfurization tower

Abstract

The utility model discloses a kind of for spray annular pipe of desulfurizing tower, including desulfurizing tower wall and annular main pipeline, the annular main pipeline is sleeved in the desulfurizing tower wall outside, the annular main pipeline inside welding has several shunt butt pipes, several the shunt butt pipe one end is equipped with drain pipe, several the drain pipe is all inserted into the desulfurizing tower wall inside, wherein, the drain pipe bottom is equipped with several spray heads, the spray head is communicated with the drain pipe inside by upper interface, the drain pipe outside is slidably connected with the sleeve tube controlled by the liquid pressure of drain pipe inside;By the reset of inner sleeve tube and outer sleeve tube, outer sleeve tube bottom end sealing covers spray head, forms physical barrier and blocks the contact path of residual smoke in tower and residual slurry in spray head inside, prevent the reaction of both to generate calcium sulfite, calcium sulfate crystal, sealing structure can also prevent external dust into spray head after shutdown.

Description

Technical Field

[0001] This utility model relates to the field of flue gas desulfurization technology, and in particular to a spray ring pipe for a desulfurization tower. Background Technology

[0002] In the long-term operation of wet desulfurization systems, nozzle scaling and clogging have always constrained system stability. In addition to factors such as solid particle deposition and solute crystallization in the slurry, the reaction between residual smoke in the tower and residual substances at the nozzles is another key contributing factor: after sulfur-containing tail gas is purified by spraying, a small amount of incompletely treated smoke (containing SO2, water vapor, and tiny gypsum particles) still diffuses upwards and comes into contact with the nozzles located in the upper part of the tower. At the same time, lime slurry or reaction products that have not been flushed away in time often remain on the nozzle surface. SO2 in the smoke will further react with these residual substances to generate hard products such as calcium sulfite and calcium sulfate. After the water vapor in the smoke condenses on the nozzle surface, it will promote the precipitation and crystallization of solutes such as Ca²⁺ and SO3²⁻ dissolved in the water. The above reaction products and crystals are easy to gradually deposit on the nozzle channel and surface, resulting in narrow channel, deterioration of atomization effect, and even complete clogging of the nozzle. This not only reduces desulfurization efficiency and increases the risk of tail gas emissions exceeding standards, but also requires frequent shutdowns for maintenance, significantly increasing operating costs and the labor intensity of employees.

[0003] The prior art, patent CN114918051A, discloses a spray pipe connection device for a power plant desulfurization tower, including a spray assembly comprising a spray pipe, one end of which is sealed and the other end connected to a valve. The spray pipe has a plurality of spray holes evenly distributed on it, and each spray hole is connected to a connecting pipe. A transition assembly includes a transition piece connected to the connecting pipe, the transition piece having a first through hole. A nozzle assembly includes a mounting piece connected to the transition piece, the mounting piece having a second through hole, and a nozzle cover connected to the mounting piece. The nozzle cover has a plurality of evenly distributed spray holes. In this spray pipe, the spray holes react with residual fumes, causing crystallization and eventually clogging the spray holes. This necessitates frequent shutdowns for manual cleaning, reducing desulfurization efficiency and increasing maintenance costs. Utility Model Content

[0004] To address the issue of residual lime slurry or reaction products on the nozzle surface that are not promptly rinsed away, SO2 in the smoke can further react with these residues to form hard products such as calcium sulfite and calcium sulfate. Furthermore, water vapor in the smoke condenses on the nozzle surface, causing dissolved solutes such as Ca²⁺ and SO₃²⁻ to crystallize. These reaction products and crystals gradually deposit in the nozzle channels and on the surface, leading to narrow channels, deteriorated atomization, and even complete nozzle blockage.

[0005] This utility model provides a spray ring pipe for a desulfurization tower, including a desulfurization tower wall, an annular main pipe and two or more drain pipes. The annular main pipe is sleeved on the outside of the desulfurization tower wall. Two or more spray heads and a lower support plate are installed at the bottom of the drain pipe. The spray heads are embedded in the lower support plate and communicate with the inside of the drain pipe. The bottom of the lower support plate is provided with clearance holes.

[0006] The outer sleeve is slidably connected to the outside of the drain pipe, the spray head is located inside the outer sleeve, the bottom end of the outer sleeve has two or more bottom holes, the bottom holes are spaced at the same distance as the spray head, and the inner wall of the outer sleeve is fixedly connected to the end of the lower support plate by a return spring.

[0007] An inner sleeve is slidably connected to the inside of the drain pipe. The bottom of the inner sleeve has two or more inner holes, and the distance between the inner holes and the arrangement of the spray heads is consistent. One end of the inner sleeve is provided with a connecting rod, which passes through the end of the drain pipe and is fixedly connected to the inner wall of one end of the outer sleeve.

[0008] Preferably, the outer side of the desulfurization tower wall is provided with two or more flange connection seats, and the outer side of the desulfurization tower wall is equipped with two or more clearance openings, the clearance openings being aligned with the flange connection seats.

[0009] Preferably, the drain pipe penetrates the wall of the desulfurization tower through the clearance opening.

[0010] Preferably, two or more diversion manifolds are welded to the inner side of the annular main pipe, and each diversion manifold is equipped with a drain pipe at one end.

[0011] Preferably, the annular main pipeline is provided with a main liquid inlet pipeline.

[0012] Preferably, each of the diversion manifolds is equipped with a switching valve to control the internal passage.

[0013] Preferably, the bottom hole is aligned with the bottom opening of the clearance hole.

[0014] Preferably, the diameter of the bottom hole is larger than the outer diameter of the spray head.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. When the system is running, lime slurry enters the drain pipe through the ring main pipe and the branch pipe. The internal liquid pressure pushes the inner sleeve forward along the inner wall of the drain pipe. The inner sleeve is equipped with a connecting rod that passes through the drain pipe and is fixedly connected to the outer sleeve. When the inner sleeve moves forward, it drives the outer sleeve to move forward synchronously through the connecting rod. At this time, the inner hole, the spray head and the bottom hole are completely aligned. The slurry is sprayed downward through the three-stage channel to achieve flue gas desulfurization. When the system stops or the flow rate decreases, because there is a return spring between the outer sleeve and the drain pipe, the pressure in the drain pipe decreases. The return spring returns from the compressed state to its original length. At this time, the inner hole and the spray head, and the bottom hole and the spray head are misaligned. At the same time, the inner sleeve and the outer sleeve are reset. The bottom end of the outer sleeve seals and covers the spray head, forming a physical barrier to block the contact path between the residual smoke in the tower and the residual slurry inside the spray head, preventing the two from reacting to form calcium sulfite or calcium sulfate crystals.

[0017] 2. The sealing structure also prevents external dust from entering the nozzle after the machine is stopped.

[0018] 3. The linkage design of the inner and outer sleeves enables the nozzles to automatically adjust their sealing state when pressure fluctuates, adapting to different working conditions. This solves the problem of nozzle blockage caused by residual substances reacting and scaling, as well as external pollutants intruding, thus improving the stability and service life of the desulfurization system and reducing the frequency and cost of manual maintenance.

[0019] 4. The bottom end of the outer sleeve fits into the bottom of the lower support plate, forming a double seal for the spray head. The lower support plate limits the sealing range of the outer sleeve through the edge of the relief hole, while the outer sleeve covers the spray head and the bottom opening of the relief hole through its bottom end, further enhancing the sealing performance of the physical barrier. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the outer sleeve of this utility model;

[0021] Figure 2 This is a three-dimensional structural diagram of the bottom hole of this utility model;

[0022] Figure 3 This is a three-dimensional enlarged cross-sectional view of the connection structure of components such as the drain pipe in this utility model;

[0023] Figure 4 This is a three-dimensional magnified structural diagram of the clearance hole of the drain pipe in this utility model.

[0024] In the diagram: 1. Desulfurization tower wall; 11. Flange connection seat; 12. Clearance opening; 2. Circular main pipe; 21. Diversion connection pipe; 22. Main liquid inlet pipe; 23. Switch valve; 3. Drain pipe; 31. Spray head; 32. Lower support plate; 321. Clearance hole; 4. Outer sleeve; 41. Bottom hole; 42. Return spring; 5. Inner sleeve; 51. Inner hole; 52. Connecting rod. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1, see Figures 1-4 .

[0027] A spray ring pipe for a desulfurization tower includes a desulfurization tower wall 1, an annular main pipe 2, and two or more drain pipes 3. The annular main pipe 2 is sleeved on the outside of the desulfurization tower wall 1. Two or more spray heads 31 and a lower support plate 32 are installed at the bottom of the drain pipe 3. The spray heads 31 are embedded in the lower support plate 32 and communicate with the inside of the drain pipe 3. The bottom of the lower support plate 32 is provided with a clearance hole 321.

[0028] The outer sleeve 4 is slidably connected to the outside of the drain pipe 3. The spray head 31 is located inside the outer sleeve 4. The bottom end of the outer sleeve 4 is provided with two or more bottom holes 41. The arrangement distance of the bottom holes 41 is consistent with that of the spray head 31. The bottom holes 41 are aligned with the bottom opening of the clearance hole 321. The diameter of the bottom holes 41 is larger than the outer diameter of the spray head 31. The inner wall of the outer sleeve 4 is fixedly connected to the end of the lower support plate 32 by a return spring 42.

[0029] The inner sleeve 5 is slidably connected to the inside of the drain pipe 3. The bottom of the inner sleeve 5 is provided with two or more inner holes 51. The arrangement distance of the inner holes 51 is consistent with that of the spray head 31. One end of the inner sleeve 5 is provided with a connecting rod 52. The connecting rod 52 passes through the end of the drain pipe 3 and is fixedly connected to the inner wall of one end of the outer sleeve 4.

[0030] The outer side of the desulfurization tower wall 1 is provided with two or more flange connection seats 11, and the outer side of the desulfurization tower wall 1 is provided with two or more clearance openings 12, the clearance openings 12 being aligned with the flange connection seats 11; the drain pipe 3 passes through the clearance openings 12 and penetrates the desulfurization tower wall 1.

[0031] When the system is running, the lime slurry passes through the main annular pipe 2 and the diversion pipe 21, passes through the desulfurization tower wall 1, and enters the drain pipe 3. The internal pressure pushes the inner sleeve 5 and the outer sleeve 4 to overcome the spring force and move forward along the inner wall of the drain pipe 3. The inner sleeve 5 is equipped with a connecting rod 52 that passes through the drain pipe 3 and is fixedly connected to the outer sleeve 4. The lower support plate 32 is used to fix the spray head 31 and the return spring 42. When the inner sleeve 5 moves forward, the connecting rod 52 drives the outer sleeve 4 to move forward synchronously. The return spring 42 is compressed forward by the outer sleeve 4. At this time, the inner hole 51, the spray head 31 and the bottom hole 41 are completely aligned. The bottom hole 41 is also aligned with the clearance hole 321. The slurry is continuously sprayed downward through the three-stage channel to achieve desulfurization.

[0032] When the system shuts down or the flow rate decreases, the pressure inside the drain pipe 3 drops. The return spring 42, using the lower support plate 32 as a support base, pushes the outer sleeve 4 back to its original length from the compressed state. The return spring 42 releases its elastic potential energy and applies a downward thrust to the outer sleeve 4, assisting it to quickly fall back to the sealing position, ensuring timely and automatic sealing after use. At this time, the inner hole 51 and the spray head 31, and the bottom hole 41 and the spray head 31 are misaligned. Simultaneously, the inner sleeve 5 and the outer sleeve 4 are reset, and the bottom end of the outer sleeve 4 seals and covers the spray head 31, forming a physical barrier to block the contact path between the residual smoke inside the tower and the residual slurry inside the spray head 31, preventing the two from reacting to form calcium sulfite or calcium sulfate crystals.

[0033] The lower support plate 32 at the bottom of the drain pipe 3 provides installation space for the spray head 31 through the clearance hole 321. The outer sleeve 4 is slidably connected to the outer side of the bottom of the lower support plate 32. The lower support plate 32 and the outer sleeve 4 cooperate to seal the spray head 31. When the system stops or the pressure drops, the outer sleeve 4 and the inner sleeve 5 reset together, and its bottom end fits against the bottom of the lower support plate 32, forming a double seal for the spray head 31. The lower support plate 32 limits the sealing range of the outer sleeve 4 through the edge of the clearance hole 321, and the outer sleeve 4 covers the spray head 31 and the bottom opening of the clearance hole 321 through its bottom end, further strengthening the sealing of the physical barrier.

[0034] The linkage design of the inner sleeve 5 and the outer sleeve 4 enables the spray head 31 to automatically adjust its sealing state when the pressure fluctuates, adapting to different working conditions. This solves the problem of spray head 31 blockage caused by residual substances reacting and scaling, as well as external pollutants intruding, thereby improving the stability and service life of the desulfurization system and reducing the frequency and cost of manual maintenance.

[0035] Example 2, see Figures 1-4 .

[0036] A spray ring pipe for a desulfurization tower includes a desulfurization tower wall 1, an annular main pipe 2, and two or more drain pipes 3. The annular main pipe 2 is sleeved on the outside of the desulfurization tower wall 1. Two or more spray heads 31 and a lower support plate 32 are installed at the bottom of the drain pipe 3. The spray heads 31 are embedded in the lower support plate 32 and communicate with the inside of the drain pipe 3. The bottom of the lower support plate 32 is provided with a clearance hole 321. An outer sleeve 4 is slidably connected to the outside of the drain pipe 3. The spray heads 31 are located inside the outer sleeve 4. The bottom end of the outer sleeve 4 is provided with two or more bottom holes 41. The arrangement distance of the bottom holes 41 is consistent with that of the spray heads 31. The bottom holes 41 are aligned with the bottom opening of the clearance hole 321.

[0037] The inner wall of the outer sleeve 4 is fixedly connected to the end of the lower support plate 32 by a return spring 42; the inner sleeve 5 is slidably connected to the inner side of the drain pipe 3, and the bottom of the inner sleeve 5 is provided with two or more inner holes 51. The arrangement distance of the inner holes 51 is consistent with that of the spray head 31. One end of the inner sleeve 5 is provided with a connecting rod 52, which passes through the end of the drain pipe 3 and is fixedly connected to the inner wall of one end of the outer sleeve 4.

[0038] Two or more diversion manifolds 21 are welded to the inner side of the annular main pipe 2. Each diversion manifold 21 is equipped with a drain pipe 3 at one end. The annular main pipe 2 is provided with a main inlet pipe 22. Each diversion manifold 21 is equipped with a switch valve 23 to control the internal passage.

[0039] By providing clearance openings 12 on the outer side of the desulfurization tower wall 1, corresponding to the position of the flange connection seat 11, the diversion connecting pipe 21 and the flange connection seat 11 are fixed with bolts, allowing the diversion connecting pipe 21 to be quickly and detachably connected to the flange connection seat 11 via bolts. During installation, the clearance openings 12 provide operating space for the bolts, ensuring a sealed connection between the diversion connecting pipe 21 and the desulfurization tower wall 1. When it is necessary to inspect or replace the spray assembly, the bolts can be directly removed to pull out the drain pipe 3, outer sleeve 4, etc. as a whole, without entering the tower for operation, thus shortening maintenance time.

[0040] The main inlet pipe 22 delivers lime slurry to the annular main pipe 2, achieving multi-directional diversion through the annular structure. Simultaneously, it uniformly supplies liquid to multiple diversion connection pipes 21. The switch valves 23 on each diversion connection pipe 21 can independently control the opening and closing of the corresponding drain pipe 3. When a blockage or a decrease in atomization effect is detected in a certain area of ​​the nozzle, the switch valve 23 of that area can be closed separately. The faulty spray component can be repaired or replaced without stopping the system, thus avoiding the impact of local problems on the operation of the entire system.

[0041] During system operation, the liquid pressure inside the drain pipe 3 pushes the inner sleeve 5 on the inner wall forward. The inner sleeve 5, through the connecting rod 52, drives the outer sleeve 4 to move forward synchronously, overcoming the elastic force of the return spring 42. This ensures that the inner hole 51 at the bottom of the inner sleeve 5, the spray head 31 at the bottom of the drain pipe 3, and the bottom hole 41 at the bottom of the outer sleeve 4 are completely aligned with the clearance hole 321 of the lower support plate 32. The slurry is then sprayed downwards through the aforementioned channels to achieve desulfurization. Furthermore, the switching valves 23 on each diversion connecting pipe 21 can independently control the corresponding discharge. The opening and closing of the liquid pipe 3; when the system stops or the flow rate decreases, the pressure inside the drain pipe 3 drops, and the return spring 42 pushes the outer sleeve 4 with the lower support plate 32 as support, driving the inner sleeve 5 to reset together. The bottom end of the outer sleeve 4 fits with the bottom of the lower support plate 32, forming a double sealing structure to cover the spray head 31, blocking the contact between the residual smoke in the tower and the spray head 31; at the same time, the clearance opening 12 on the desulfurization tower wall 1 provides operating space for the installation and disassembly of the diversion connection pipe 21, which is convenient for component maintenance and replacement.

[0042] The fixed connection methods in this utility model include detachable threaded connections, pin connections, chain connections, spline connections, etc.; it also includes non-detachable connections such as welding, riveting, interference fit, etc., and movable connections can be hinges, bearings, and slide rails, etc., which can be selected and adapted according to different working scenario requirements.

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

Claims

1. A spray ring pipe for a desulfurization tower, characterized in that, It includes a desulfurization tower wall (1), an annular main pipe (2) and two or more drain pipes (3). The annular main pipe (2) is sleeved on the outside of the desulfurization tower wall (1). Two or more spray heads (31) and a lower support plate (32) are installed at the bottom of the drain pipe (3). The spray head (31) is embedded in the lower support plate (32). The spray head (31) is connected to the inside of the drain pipe (3). The bottom of the lower support plate (32) is provided with a clearance hole (321). The outer sleeve (4) is slidably connected to the outside of the drain pipe (3). The spray head (31) is located inside the outer sleeve (4). The bottom end of the outer sleeve (4) is provided with two or more bottom holes (41). The bottom holes (41) are arranged at the same distance as the spray head (31). The inner wall of the outer sleeve (4) is fixedly connected to the end of the lower support plate (32) by a reset spring (42). The drain pipe (3) is slidably connected to an inner sleeve (5). The bottom of the inner sleeve (5) is provided with two or more inner holes (51). The arrangement distance of the inner holes (51) is consistent with that of the spray head (31). One end of the inner sleeve (5) is provided with a connecting rod (52). The connecting rod (52) passes through the end of the drain pipe (3) and is fixedly connected to the inner wall of one end of the outer sleeve (4).

2. The spray ring pipe of a desulfurization tower according to claim 1, characterized in that, The outer side of the desulfurization tower wall (1) is provided with two or more flange connection seats (11), and the outer side of the desulfurization tower wall (1) is provided with two or more clearance openings (12), and the clearance openings (12) are in the same position as the flange connection seats (11).

3. The spray ring pipe of a desulfurization tower according to claim 2, characterized in that, The drain pipe (3) penetrates the wall (1) of the desulfurization tower through the clearance opening (12).

4. The spray ring pipe of a desulfurization tower according to claim 1, characterized in that, Two or more diversion manifolds (21) are welded to the inner side of the annular main pipe (2), and each diversion manifold (21) is equipped with a drain pipe (3) at one end.

5. The spray ring pipe of a desulfurization tower according to claim 1, characterized in that, The annular main pipeline (2) is equipped with a main liquid inlet pipeline (22).

6. The spray ring pipe of a desulfurization tower according to claim 4, characterized in that, Each of the diversion manifolds (21) is equipped with a switch valve (23) to control the internal passage.

7. The spray ring pipe of a desulfurization tower according to claim 1, characterized in that, The bottom hole (41) is aligned with the bottom opening of the clearance hole (321).

8. The spray ring pipe of a desulfurization tower according to claim 1, characterized in that, The diameter of the bottom hole (41) is larger than the outer diameter of the spray head (31).

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