A boiler flue gas desulfurization and denitrification equipment

Abstract

The application relates to the technical field of flue gas desulfurization and denitrification equipment, and discloses a boiler flue gas desulfurization and denitrification equipment, which comprises a tower body, the outer side of the tower body is provided with a plurality of detachable spray devices arranged in a circumferential array, each detachable spray device comprises a positioning pipe, one end of the positioning pipe is provided with a nozzle positioning device, a movable atomizing nozzle is arranged in the nozzle positioning device, a plugging mechanism is arranged in the nozzle positioning device, a lower notch close to the nozzle positioning device is formed in the positioning pipe, and a one-way valve device is arranged at the end of the positioning pipe far from the nozzle positioning device. Through the plurality of detachable spray devices, the atomizing nozzles extending from the detachable spray devices to the inside of the tower body are designed, the liquid supply end and the inner cavity of the tower body are blocked to prevent leakage and flue gas from escaping, the atomizing nozzles with faults during flue gas desulfurization are replaced in real time and quickly, the continuous desulfurization treatment of the boiler flue gas is ensured, and therefore the flue gas desulfurization and denitrification efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of flue gas desulfurization and denitrification equipment, and in particular to a boiler flue gas desulfurization and denitrification equipment. Background Technology

[0002] With the rapid development of global industrialization, boilers, which use fossil fuels such as coal as their main energy source, continue to play a core role in power generation, heating, and industrial production. Because their combustion process produces a large amount of flue gas, and the sulfur dioxide (SO2) and nitrogen oxides (NOx) contained in the flue gas are among the most important sources of air pollution, desulfurization and denitrification equipment is required to treat the flue gas before it is emitted. Desulfurization is achieved by atomizing lime slurry into extremely fine droplets in a reaction tower, which then reacts with the flue gas to remove SO2 from the flue gas.

[0003] In existing reaction towers, the absorbent slurry contains a large number of incompletely dissolved limestone particles, gypsum crystals, and fly ash carried by the flue gas. The internal flow channels of the nozzles are narrow, and the slurry is sprayed out at high speed under high pressure. These hard particles continuously scour the inner wall and outlet of the nozzles, causing nozzle wear. Furthermore, calcium sulfite, gypsum, and other substances in the slurry can form supersaturated crystals on the nozzle surface, resulting in a short nozzle lifespan and frequent replacement. However, the nozzles in existing desulfurization and denitrification equipment are fixed inside the reaction tower, which makes nozzle replacement troublesome. Moreover, the desulfurization and denitrification work needs to be interrupted when replacing nozzles, which affects the efficiency of boiler flue gas desulfurization and denitrification. Summary of the Invention

[0004] This application proposes a boiler flue gas desulfurization and denitrification device, which has the advantage of facilitating the replacement of faulty nozzles during flue gas desulfurization and denitrification operations. This solves the problem in existing flue gas desulfurization and denitrification devices where the nozzles used for atomizing absorbent slurry are fixedly installed inside the reaction tower, resulting in troublesome nozzle replacement and affecting the efficiency of boiler flue gas desulfurization and denitrification.

[0005] To achieve the above objectives, this application adopts the following technical solution: a boiler flue gas desulfurization and denitrification device, comprising a tower body, a flue gas inlet on one side of the tower body, a flue gas outlet at the top of the tower body, and a plurality of detachable spray devices in a circular array on the outer side of the tower body. The detachable spray device includes a positioning tube fixedly installed on the outer side of the tower body, a nozzle positioning device extending into the tower body at one end of the positioning tube, an atomizing nozzle movably fitted inside the nozzle positioning device, the nozzle orifice of the atomizing nozzle extending out of the nozzle positioning device, and a sealing mechanism inside the nozzle positioning device. A plunger is movably fitted inside the positioning tube, and a lower groove near the nozzle positioning device is opened on the positioning tube. A one-way valve device is provided at the end of the positioning tube away from the nozzle positioning device, and a liquid inlet pipe is connected to the end of the one-way valve device away from the positioning tube.

[0006] In use, the plunger, together with the nozzle positioning device, fixes the atomizing nozzle. The absorbent slurry for desulfurization is pumped to the atomizing nozzle through the inlet pipe. If one of the atomizing nozzles fails, the end of the plunger away from the atomizing nozzle is moved and fixed, so that the one-way valve device is closed. The atomizing nozzle is then removed and replaced from the lower slot. During this process, the sealing mechanism seals the original location of the atomizing nozzle.

[0007] Furthermore, a first sealing block is provided on one side of the positioning tube. The side of the first sealing block away from the positioning tube is an arc-shaped design that matches the outer side of the tower body. The positioning tube and the first sealing block are fixed to the outer side of the tower body together by bolts. The first sealing block seals the gap between the nozzle positioning device and the tower body, ensuring the airtightness of the inner cavity of the tower and preventing flue gas from leaking from the gap between the nozzle positioning device and the tower body.

[0008] Furthermore, the nozzle positioning device includes a first positioning block and a second positioning block, which are fixed together by bolts. A nozzle mounting groove is provided in the middle of the first and second positioning blocks. The atomizing nozzle is movably fitted inside the nozzle mounting groove. An inner sliding groove communicating with the nozzle mounting groove is provided at the connection between the first and second positioning blocks. A sealing mechanism is provided inside the inner sliding groove. Through the splicing design of the first and second positioning blocks, an inner sliding groove is provided at the splicing part of the two to install a sealing mechanism for sealing the nozzle mounting groove. When the atomizing nozzle inside the nozzle mounting groove is removed for replacement, the sealing mechanism seals the nozzle mounting groove to prevent the flue gas inside the tower from escaping from the original location of the atomizing nozzle, i.e., the nozzle mounting groove.

[0009] Furthermore, the sealing mechanism includes two second sealing blocks movably disposed within the inner sliding groove. The two second sealing blocks are arranged vertically, and a first spring is provided between the side of the two second sealing blocks that is far apart from each other and the inner wall of the inner sliding groove. Under the elastic force of the two first springs, the two second sealing blocks tend to move towards each other. When the atomizing nozzle inside the nozzle mounting slot is removed, the two second sealing blocks move towards each other until they fit together under the elastic force of the first springs, sealing the nozzle mounting slot. This allows the nozzle mounting slot to be sealed by the two fitted second sealing blocks after the atomizing nozzle is disassembled and repaired due to malfunctions such as blockage, preventing the flue gas inside the tower from escaping from the nozzle mounting slot. Consequently, it is possible to repair and replace a single faulty atomizing nozzle without stopping the flue gas treatment.

[0010] Furthermore, one end of the atomizing nozzle is provided with a hexagonal nut, and one end of the nozzle mounting groove is designed with a hexagonal groove for the hexagonal nut. After the atomizing nozzle is inserted into the nozzle mounting groove, the through hole is used to limit the atomizing nozzle, so that the nozzle orifice of the atomizing nozzle remains fixed.

[0011] Furthermore, the length of the lower slot is not less than the length of the atomizing nozzle, ensuring that the atomizing nozzle can be removed from the lower slot. The length of the lower slot is less than the length of the plunger, ensuring that the plunger can effectively seal the lower slot when it moves to contact the nozzle positioning device, preventing the absorbent slurry in the positioning tube from leaking from the lower slot.

[0012] Furthermore, the positioning tube has an upper sliding groove located above the lower slot, and the positioning tube also has arc-shaped grooves located at both ends of the upper sliding groove. The arc-shaped grooves are connected to the upper sliding groove. The top of the plunger is fixedly installed with a moving shaft that is compatible with the upper sliding groove and the arc-shaped groove. By moving the moving shaft, the plunger is driven to move towards one end of the nozzle positioning device, and then the moving shaft is rotated into the arc-shaped groove near the nozzle positioning device. The arc-shaped groove is used to limit the moving shaft, thereby making the plunger cooperate with the nozzle positioning device to keep the atomizing nozzle in a clamping state.

[0013] Furthermore, the one-way valve device includes a valve tube fixedly installed at one end of the positioning tube, the inner diameter of the valve tube being larger than that of the positioning tube. A valve seat is fixedly connected to the end of the valve tube furthest from the positioning tube, and a guide groove is formed in the middle of the valve seat. A limiting ring is provided inside the valve tube, and the limiting ring fits against one end of the positioning tube. Sliding shafts are movably fitted at the top and bottom of the limiting ring, respectively. A valve block is fixedly connected to one end of each sliding shaft. A second spring is movably fitted between the valve block and the limiting ring, between the two sliding shafts. The elastic force of the second spring causes the valve block to seal under normal conditions. When high-pressure slurry is supplied to the atomizing nozzle, the slurry pushes the valve block towards the side of the limiting ring. It then passes through the valve pipe, the limiting ring, the positioning pipe, and the liquid guide groove in the middle of the plunger into the atomizing nozzle, from which it sprays into the interior of the tower. When the atomizing nozzle needs to be removed for maintenance or replacement, the moving shaft is moved from the arc-shaped groove at the end of the upper sliding groove near the atomizing nozzle to another arc-shaped groove at the end away from the atomizing nozzle. At this time, the side of the plunger away from the atomizing nozzle limits the sliding shaft, keeping the valve block in a state of blocking the flow guide groove in the middle of the valve seat to prevent slurry leakage.

[0014] Furthermore, a horizontal pipe is connected to the bottom of the inner cavity of the tower body. One end of the horizontal pipe extends out of the outside of the tower body and connects to the inlet of the circulating pump. A vertical pipe is connected to the outlet of the circulating pump. A four-way pipe is connected to the end of the inlet pipe away from the valve seat. The four-way pipes of two adjacent one-way valve devices away from the detachable spray device are connected by a liquid guide branch pipe. One end of the detachable spray device is also connected to the top of the circulating pump. A sealing plug is fixedly fitted to one end of the four-way pipe not connected to the circulating pump. The absorbent slurry in the tower body is pumped to each atomizing nozzle through the vertical pipe, the liquid guide branch pipe and the inlet pipe by the circulating pump, which facilitates the recycling of the absorbent slurry.

[0015] Furthermore, a demister is fixedly installed in the inner cavity of the tower body above the detachable spray device. The demister is composed of several wavy grid plates. After the sprayed liquid from the atomizing nozzle reacts with the flue gas, it generates tiny droplets containing ammonium sulfate, calcium sulfite, and calcium sulfate, which are captured by the demister to prevent these droplets from causing scale buildup in the flue and corrosion of equipment.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The boiler flue gas desulfurization and denitrification equipment provided in this application uses several detachable spray devices arranged in a circumferential array on the outside of the tower body. The detachable design of the atomizing nozzles extending from the detachable spray devices into the tower body, combined with the sealing of the liquid supply end and the inner cavity of the tower body to prevent leakage and flue gas escape when the atomizing nozzles are removed, enables real-time and rapid replacement of faulty atomizing nozzles during flue gas desulfurization, ensuring continuous desulfurization treatment of boiler flue gas and thus improving the efficiency of flue gas desulfurization and denitrification.

[0018] 2. Several detachable spray devices are arranged in a circumferential array on the outside of the tower body. The atomizing nozzles, which are easy to remove, extend into the inside of the tower body to spray. The atomizing nozzles arranged in a circumferential array on the tower body spray towards the axis of the tower body, so that the absorbent can be atomized and completely cover the path of the flue gas. This is conducive to the full contact between the atomized absorbent and the flue gas, and improves the reaction efficiency.

[0019] 3. Through the real-time detachable design of the atomizing nozzle, when the boiler load increases and the sulfur content of the coal increases, a high-flow atomizing nozzle can be replaced to ensure that the spray volume meets the standard, in response to the increase in flue gas volume and SO2 concentration. When the boiler load decreases and the sulfur content of the coal decreases, a low-flow atomizing nozzle can be replaced to avoid the slurry falling back before reaction due to excessive spraying by the high-flow atomizing nozzle. This allows the flow rate, atomization characteristics, and spray coverage of the atomizing nozzle to be precisely matched with the actual flue gas parameters, which is conducive to ensuring stable and high efficiency of desulfurization, and also reduces the operating energy consumption of the desulfurization and denitrification system and reduces the waste of absorbent. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the middle section structure;

[0023] Figure 3 for Figure 2 A magnified schematic diagram of the structure of part A in the diagram;

[0024] Figure 4 for Figure 3 A schematic diagram of the structure of one of the detachable spray devices;

[0025] Figure 5 for Figure 4 A disassembly diagram of the central blocking mechanism;

[0026] Figure 6 for Figure 4 A schematic diagram of the central positioning tube.

[0027] In the diagram: 1. Tower body; 2. Smoke inlet; 3. Smoke outlet; 4. Detachable spray device; 401. Positioning tube; 4011. Lower slot; 4012. Upper sliding groove; 4013. Arc-shaped groove; 402. First sealing block; 403. Nozzle positioning device; 4031. First positioning block; 4032. Second positioning block; 4033. Nozzle mounting groove; 4034. Inner sliding groove; 4035. Second sealing block; 4036, First Spring; 404, Atomizing Nozzle; 405, Plunger; 406, Moving Shaft; 5, Horizontal Pipe; 6, Circulating Pump; 7, Vertical Pipe; 8, One-Way Valve Device; 801, Valve Pipe; 802, Valve Seat; 803, Limiting Ring; 804, Sliding Shaft; 805, Valve Block; 806, Second Spring; 9, Inlet Pipe; 10, Four-Way Pipe; 11, Liquid Guide Branch Pipe; 12, Sealing Plug; 13, Demister. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1-3A boiler flue gas desulfurization and denitrification device includes a tower body 1. A flue gas inlet 2 is provided on one side of the tower body 1. The boiler flue gas to be desulfurized and denitrified enters the interior of the tower body 1 through the flue gas inlet 2. Several detachable spray devices 4 are arranged in a circular array on the outside of the tower body 1. The detachable spray devices 4 are located above the flue gas inlet 2. A horizontal pipe 5 is connected to the bottom of the inner cavity of the tower body 1. One end of the horizontal pipe 5 extends out of the outside of the tower body 1 and is connected to the inlet of the circulating pump 6. A vertical pipe 7 is connected to the outlet of the circulating pump 6. The end of the vertical pipe 7 away from the circulating pump 6 is connected to the detachable spray devices 4. The circulating pump 6 pumps the absorbent slurry (limestone (CaCO3) slurry) at the bottom of the inner cavity of the tower body 1 to the outlet of the detachable spray devices 4. The detachable spray devices 4 spray inside the tower body 1, which fully contacts and reacts with the flue gas flowing into the tower body 1 to achieve the effect of flue gas desulfurization.

[0030] Please see Figures 3-6 The detachable spray device 4 includes a positioning tube 401 located on the outside of the tower body 1. A first sealing block 402 is provided on one side of the positioning tube 401. The side of the first sealing block 402 away from the positioning tube 401 has an arc surface design that matches the outside of the tower body 1. The positioning tube 401 and the first sealing block 402 are fixed to the outside of the tower body 1 together by bolts. A nozzle positioning device 403 is fixedly installed at one end of the inside of the positioning tube 401. One end of the nozzle positioning device 403 extends into the inside of the tower body 1. The first sealing block 402 seals the gap between the nozzle positioning device 403 and the tower body 1 to ensure the airtightness of the inner cavity of the tower body 1 and prevent flue gas from escaping from the gap between the nozzle positioning device 403 and the tower body 1.

[0031] The nozzle positioning device 403 includes a first positioning block 4031 and a second positioning block 4032, which are fixed together by bolts. A nozzle mounting groove 4033 is provided in the middle of the first positioning block 4031 and the second positioning block 4032. An atomizing nozzle 404 is movably fitted in the nozzle mounting groove 4033. One end of the atomizing nozzle 404 extends into the interior of the tower body 1, and a spray hole is provided at the end of the atomizing nozzle 404 that extends into the interior of the tower body 1. The angle between the axis of the spray hole and the horizontal plane (i.e., the horizontal cross-section of the tower body 1) is between zero and sixty degrees. The specific angle value depends on the inner diameter of the tower body 1 and the spray distance. One end of the nozzle mounting groove 4033 is designed with a hexagonal groove to match the hexagonal nut at one end of the atomizing nozzle 404, so that after the atomizing nozzle 404 is inserted into the nozzle mounting groove 4033, the spray hole of the atomizing nozzle 404 remains fixed.

[0032] The connection between the first positioning block 4031 and the second positioning block 4032 is provided with an inner sliding groove 4034 that communicates with the nozzle mounting groove 4033. Two second sealing blocks 4035 are movably fitted within the inner sliding groove 4034. The two second sealing blocks 4035 are arranged vertically, and a first spring 4036 is provided between the side of the two second sealing blocks 4035 that is furthest from each other and the inner wall of the inner sliding groove 4034. Under the elastic force of the two first springs 4036, the two second sealing blocks 4035 tend to move towards each other. When the nozzle mounting groove 4032 is removed... After the atomizing nozzle 404 inside the tower 33 is installed, the two second sealing blocks 4035 move towards each other and fit together under the elastic force of the first spring 4036, sealing the nozzle mounting groove 4033. This allows the nozzle mounting groove 4033 to be sealed by the two fitted second sealing blocks 4035 after the atomizing nozzle 404 has been disassembled and repaired due to blockage or other faults. This prevents the flue gas inside the tower 1 from escaping from the nozzle mounting groove 4033, and allows for the repair and replacement of a single faulty atomizing nozzle 404 without stopping the flue gas treatment.

[0033] The diameter of one side of the two second sealing blocks 4035 after they come into contact decreases uniformly from the end closest to the first positioning block 4031, so that after the two second sealing blocks 4035 come into contact and close, the atomizing nozzle 404 can push the two second sealing blocks 4035 to separate.

[0034] The bottom of the positioning tube 401 has a lower groove 4011 near one end of the first sealing block 402. The length of the lower groove 4011 is not less than the length of the atomizing nozzle 404, so that the atomizing nozzle 404 can be removed from the lower groove 4011. A plunger 405 is movably fitted inside the positioning tube 401. A liquid guide groove communicating with the inner cavity of the atomizing nozzle 404 is opened in the middle of the plunger 405. The length of the plunger 405 is greater than the length of the lower groove 4011, ensuring that the plunger 405 will not fall out of the lower groove 4011. An upper sliding groove 4012 is opened on the positioning tube 401 above the lower groove 4011. An arc-shaped groove 4013 is also provided at both ends of the upper sliding groove 4012. The arc-shaped groove 4013 communicates with the upper sliding groove 4012. A movable shaft 406 adapted to the upper sliding groove 4012 and the arc-shaped groove 4013 is fixedly installed on the top of the plunger 405. By moving the movable shaft 406, the plunger 405 is driven to move toward one end of the nozzle positioning device 403. Then, the movable shaft 406 is rotated into the arc-shaped groove 4013 near one end of the nozzle positioning device 403. The arc-shaped groove 4013 is used to limit the movable shaft 406, thereby keeping the plunger 405 and the nozzle positioning device 403 in a state of clamping the atomizing nozzle 404.

[0035] A one-way valve device 8 is fixedly connected to the end of the positioning tube 401 away from the nozzle positioning device 403. The one-way valve device 8 includes a valve tube 801 fixedly installed at the end of the positioning tube 401 away from the nozzle positioning device 403. The inner diameter of the valve tube 801 is larger than the inner diameter of the positioning tube 401. A valve seat 802 is fixedly connected to the end of the valve tube 801 away from the positioning tube 401, and a guide groove is provided in the middle of the valve seat 802. A limiting ring 803 is provided inside the valve tube 801. The limiting ring 803 fits against one end of the positioning tube 401. Sliding shafts 804 are movably fitted at the top and bottom of the limiting ring 803, respectively. A valve block 805 is fixedly connected to one end of the sliding shaft 804. A second spring 806 is movably fitted between the two sliding shafts 804 between the valve block 805 and the limiting ring 803. The elastic force of the second spring 806 causes the valve to... Under normal conditions, block 805 blocks the guide groove in the middle of valve seat 802. When high-pressure slurry is delivered to atomizing nozzle 404, the slurry pushes block 805 toward the side of limiting ring 803, and enters atomizing nozzle 404 through valve pipe 801, limiting ring 803, positioning pipe 401, and the liquid guide groove in the middle of plunger 405. The atomizing nozzle 404 sprays the slurry into the interior of tower body 1. When atomizing nozzle 404 needs to be removed for maintenance and replacement, the moving shaft 406 is moved from the arc groove 4013 near the end of upper sliding groove 4012 close to atomizing nozzle 404 to another arc groove 4013 away from atomizing nozzle 404. At this time, the side of plunger 405 away from atomizing nozzle 404 limits the sliding shaft 804, so that block 805 always keeps blocking the guide groove in the middle of valve seat 802 to prevent slurry leakage.

[0036] One end of the valve seat 802 is fixedly connected to an inlet pipe 9 that communicates with the guide groove. The end of the inlet pipe 9 away from the valve seat 802 is connected to a four-way pipe 10. The four-way pipes 10 of two adjacent one-way valve devices 8 away from the detachable spray device 4 are connected by a liquid guide branch pipe 11. One end of the detachable spray device 4 is also connected to the top of the circulating pump 6. The end of the four-way pipe 10 not connected to the circulating pump 6 is fixedly fitted with a sealing plug 12.

[0037] Please continue to participate. Figures 1-3 The inner cavity of the tower body 1 is fixedly installed with a demister 13 located above the detachable spray device 4. The demister 13 is composed of several wavy grid plates. After the sprayed liquid from the atomizing nozzle 404 reacts with the flue gas, it generates tiny droplets containing ammonium sulfate, calcium sulfite, and calcium sulfate, which are collected by the demister 13 to prevent such droplets from causing scale buildup in the flue and corrosion of equipment.

[0038] In operation, flue gas enters the interior of tower body 1 through inlet 2 and flows upward within tower body 1. Simultaneously, the absorbent slurry is transported via circulating pump 6 through vertical pipe 7 to each detachable spray device 4. The absorbent slurry flows sequentially through four-way pipe 10, liquid inlet pipe 9, guide groove in the middle of valve seat 802, valve pipe 801, limit ring 803, positioning pipe 401, and liquid guide groove in the middle of plunger 405 before entering atomizing nozzle 404. The atomizing nozzle 404 then sprays the mist into the interior of tower body 1. The atomizing nozzle 404 reacts with the upstream flue gas to remove SO2. When one of the atomizing nozzles 404 malfunctions and needs to be replaced, the plunger 405 is quickly moved toward one end of the limiting ring 803, and the moving shaft 406 is locked in the arc groove 4013 at the end away from the nozzle positioning device 403. At this time, the limiting effect of the plunger 405 on the sliding shaft 804 causes the valve block 805 to block the liquid guide groove in the middle of the valve seat 802. At this time, the atomizing nozzle 404 can be removed from the lower groove opening 4011 and replaced.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A boiler flue gas desulfurization and denitrification device, comprising a tower body, a flue gas inlet on one side of the tower body, and a flue gas outlet at the top of the tower body, characterized in that, The outer side of the tower body is provided with several detachable spray devices in a circular array. Each detachable spray device includes a positioning tube fixedly installed on the outer side of the tower body. One end of the positioning tube is provided with a nozzle positioning device extending into the tower body. An atomizing nozzle is movably fitted inside the nozzle positioning device. The nozzle orifice of the atomizing nozzle extends out of the nozzle positioning device. A sealing mechanism is provided inside the nozzle positioning device. A plunger is movably fitted inside the positioning tube. A lower groove is opened on the positioning tube near the nozzle positioning device. A one-way valve is provided at the end of the positioning tube away from the nozzle positioning device. A liquid inlet pipe is connected to the end of the one-way valve away from the positioning tube. The positioning tube has an upper sliding groove located above the lower groove opening, and the positioning tube also has arc-shaped grooves located at both ends of the upper sliding groove. The arc-shaped grooves are connected to the upper sliding groove, and the top of the plunger is fixedly installed with a moving shaft that is compatible with the upper sliding groove and the arc-shaped groove. The plunger has a liquid guide groove in the middle that communicates with the inner cavity of the atomizing nozzle, and the length of the plunger is greater than the length of the lower groove opening; In use, the plunger, together with the nozzle positioning device, fixes the atomizing nozzle. The absorbent slurry for desulfurization is pumped to the atomizing nozzle through the inlet pipe. If one of the atomizing nozzles fails, the end of the plunger away from the atomizing nozzle is moved and fixed, so that the one-way valve device is closed. The atomizing nozzle is then removed and replaced from the lower slot. During this process, the sealing mechanism seals the original location of the atomizing nozzle.

2. The boiler flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, A sealing block is provided on one side of the positioning tube. The side of the sealing block away from the positioning tube has an arc surface design that matches the outer side of the tower body. The positioning tube and the sealing block are fixed to the outer side of the tower body together with bolts.

3. The boiler flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The nozzle positioning device includes a first positioning block and a second positioning block, which are fixed together by bolts. A nozzle mounting groove is provided in the middle of the first and second positioning blocks. The atomizing nozzle is movably fitted inside the nozzle mounting groove. An inner sliding groove communicating with the nozzle mounting groove is provided at the connection between the positioning tube and the sealing block. The sealing mechanism is located inside the inner sliding groove.

4. The boiler flue gas desulfurization and denitrification equipment according to claim 3, characterized in that, The sealing mechanism includes two sealing blocks movably disposed within the inner groove. The two sealing blocks are arranged vertically, and a first spring is provided between the side of the two sealing blocks that is far apart from each other and the inner wall of the inner groove.

5. The boiler flue gas desulfurization and denitrification equipment according to claim 3, characterized in that, One end of the atomizing nozzle is provided with a hexagonal nut, and one end of the nozzle mounting groove is designed with a hexagonal groove for the hexagonal nut.

6. The boiler flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The length of the lower slot is not less than the length of the atomizing nozzle.

7. The boiler flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The one-way valve device includes a valve tube fixedly installed at one end of a positioning tube. The inner diameter of the valve tube is larger than that of the positioning tube. A valve seat is fixedly connected to the end of the valve tube away from the positioning tube, and a flow guide groove is provided in the middle of the valve seat. A limiting ring is provided inside the valve tube and fits against one end of the positioning tube. Sliding shafts are movably fitted at the top and bottom of the limiting ring, respectively. A valve block is fixedly connected to one end of the sliding shaft. A second spring is movably fitted between the two sliding shafts between the valve block and the limiting ring.

8. The boiler flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The bottom of the inner cavity of the tower is connected to a horizontal pipe. One end of the horizontal pipe extends out of the tower body and connects to the inlet of the circulating pump. The outlet of the circulating pump is connected to a vertical pipe. The end of the liquid inlet pipe away from the valve seat is connected to a four-way pipe. The four-way pipes of two adjacent one-way valve devices away from the detachable spray device are connected by a liquid guide branch pipe. One end of the detachable spray device is also connected to the top of the circulating pump. A sealing plug is fixedly fitted to one end of the four-way pipe that is not connected to the circulating pump.

9. The boiler flue gas desulfurization and denitrification equipment according to claim 1, characterized in that, The inner cavity of the tower is fixedly equipped with a demister located above the detachable spray device. The demister is composed of several wavy grid plates.

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