Anti-blocking device for spraying pipeline of desulfurizing tower of thermal power plant

Abstract

The invention relates to the technical field of flue gas desulfurization and discloses a thermal power plant desulfurization tower spraying pipeline anti-blocking device which comprises a spraying pipe and an anti-blocking part, the spraying pipe is used for being arranged in a desulfurization tower, one end of the spraying pipe is communicated with a liquid supply part, and the other end of the spraying pipe is used for spraying desulfurization slurry; the anti-blocking part comprises a fixing rod, the fixing rod is arranged on the inner wall of the spraying pipe, the fixing rod is connected with one end of the connecting rod, the other end of the connecting rod is sleeved with the closing plate, the closing plate is used for closing the slurry spraying end of the spraying pipe, and the elastic piece is connected between the closing plate and the fixing rod; according to the anti-blocking device for the spraying pipeline of the desulfurizing tower of the thermal power plant, when the spraying pipeline stops, the sealing plate seals the slurry spraying end of the spraying pipe under the pulling force effect of the elastic piece, and when the spraying pipeline works, the sealing plate opens the slurry spraying end of the spraying pipe under the pressure effect of slurry. Corrosive gas and dust backward flowing paths are blocked, and the problem that pipelines are prone to being blocked after shutdown is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of flue gas desulfurization, and particularly relates to a fire power plant desulfurization tower spray pipeline anti-blocking device. BACKGROUND

[0002] In the process of coal-fired power generation in a fire power plant, a large amount of sulfur-containing flue gas is generated, and if it is directly discharged, it will cause serious air pollution, so desulfurization treatment becomes a key link for the fire power plant to meet the environmental protection standard. As a core desulfurization equipment, the spray system of the desulfurization tower realizes the absorption and removal of sulfur elements by fully contacting the desulfurization slurry with the sulfur-containing flue gas after atomizing the desulfurization slurry, and the smoothness of the spray pipeline directly determines the desulfurization efficiency and the equipment operation stability.

[0003] The current spray pipeline used in the desulfurization tower of the fire power plant is not closed after shutdown, which easily causes the backflow of corrosive gas or dust in the spray tower, and causes the spray pipeline to be blocked. SUMMARY

[0004] The present application aims to at least solve one of the problems in the related art. To this end, the embodiments of the present application propose a fire power plant desulfurization tower spray pipeline anti-blocking device, which can close the spray pipeline after shutdown to prevent the backflow of dust in the desulfurization tower from causing blockage.

[0005] The fire power plant desulfurization tower spray pipeline anti-blocking device of the embodiments of the present application comprises: A spray pipe is arranged in the desulfurization tower, one end of the spray pipe is in communication with a liquid supply part, and the other end of the spray pipe is used for spraying desulfurization slurry. An anti-blocking part comprises a fixed rod, a connecting rod, a closing plate and an elastic member, the fixed rod is arranged on the inner wall of the spray pipe, one end of the fixed rod is connected with the connecting rod, the closing plate is sleeved on the other end of the connecting rod, the closing plate is used for closing the slurry spraying end of the spray pipe, and the elastic member is connected between the closing plate and the fixed rod. When the spray pipeline is shutdown, the closing plate closes the slurry spraying end of the spray pipe under the pulling force of the elastic member, and when the spray pipeline is working, the closing plate opens the slurry spraying end of the spray pipe under the pressure of the slurry.

[0006] The power plant desulfurization tower spray pipeline anti-blocking device provided by the embodiment of the application directly blocks the reverse flow path of corrosive gas and dust through the shutdown closing function of the closing plate, thereby solving the problem of pipeline blockage after shutdown. The pipeline smoothness is continuously guaranteed, and the spray system atomization effect and sulfur element absorption efficiency are ensured without frequent cleaning of the blockage, thereby reducing the probability of equipment failure and shutdown. No additional power source is required, and the automatic opening and closing are realized only through the balance of elastic force and slurry pressure, thereby reducing the maintenance cost and improving the operation reliability. The corrosion of corrosive gas on the inner wall of the spray pipe is reduced, the pipeline loss is reduced, and the equipment maintenance and replacement cost is indirectly reduced.

[0007] In some embodiments, a diffusion part is further included, which is arranged at a slurry spraying end of the spray pipe, and the diffusion part comprises: a diffusion ball head, which is arranged in communication at the slurry spraying end, and the closing plate is located inside the diffusion ball head; a plurality of spray holes, which are uniformly arranged on the diffusion ball head, and the plurality of spray holes are used for uniformly spraying the desulfurization slurry in the desulfurization tower.

[0008] In some embodiments, the diffusion part further comprises a centrifugal impeller rotatably arranged on the connecting rod, the centrifugal impeller is arranged between the closing plate and the elastic member, and the centrifugal impeller is used for disturbing the flow of the desulfurization slurry, so as to enhance the hydraulic flushing of the slurry on the inside of the diffusion ball head and the spray holes, thereby preventing the spray holes from being blocked.

[0009] In some embodiments, a plurality of filter screens are further included, which are arranged in intervals along the height direction of the desulfurization tower, the filter screens are used for filtering flue gas passing through the desulfurization tower, and a plurality of spray pipes are arranged on the upper side of each filter screen, and the desulfurization slurry sprayed by the spray pipes is used for flushing the filter screens.

[0010] In some embodiments, a liquid supply main pipe is further included, which is arranged in the desulfurization tower, one end of the liquid supply main pipe is in communication with the liquid supply part, the spray pipe is arranged on the liquid supply main pipe and in communication with the liquid supply main pipe, and the liquid supply main pipe is used for supplying the desulfurization slurry into the plurality of spray pipes.

[0011] In some embodiments, an intermittent rotation part is further included, which is connected with the liquid supply main pipe, and the intermittent rotation part is used for driving the liquid supply main pipe to rotate intermittently, so that the spray pipe moves intermittently in the desulfurization tower, thereby uniformly spraying the desulfurization slurry in the desulfurization tower.

[0012] In some embodiments, at least two cleaning parts are further included, which are symmetrically arranged on the upper and lower sides of the filter screen, and the cleaning part comprises: A plurality of installation rods are arranged on the liquid supply main pipe in a circumferential direction; A plurality of scrapers are arranged corresponding to the installation rods, the scrapers are in contact with the filter screen, and the scrapers are used to scrape the attachments on the surface of the filter screen.

[0013] In some embodiments, the cleaning part further comprises a compression ring arranged on the inner wall of the desulfurization tower, the compression ring is located on the side of the installation rod away from the filter screen, and the compression ring is used to keep the scraper in contact with the surface of the filter screen.

[0014] In some embodiments, a plurality of entering holes are arranged at the bottom of the desulfurization tower, and the entering holes are used for flue gas to enter the desulfurization tower.

[0015] In some embodiments, the bottom of the desulfurization tower is conical, a scraping rod is arranged on the liquid supply main pipe, the scraping rod is attached to the bottom of the desulfurization tower, and the scraping rod is used to scrape the attachments on the bottom of the desulfurization tower. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall schematic diagram of the present application.

[0017] Figure 2 is the internal structure schematic diagram of the desulfurization tower in the present application.

[0018] Figure 3 is the structure schematic diagram of the anti-blocking part in the present application.

[0019] Figure 4 is the structure schematic diagram of the cleaning part in the present application.

[0020] Figure 5 is the structure schematic diagram of the intermittent rotation part in the present application Figure 1 .

[0021] Figure 6 is the structure schematic diagram of the intermittent rotation part in the present application Figure 2 .

[0022] REFERENCE SIGNS: 1, spray pipe; 2, desulfurization tower; 3, liquid supply part; 4, anti-blocking part; 41, fixed rod; 42, connecting rod; 43, closing plate; 44, elastic member; 5, diffusion part; 51, diffusion ball head; 52, spray hole; 53, centrifugal impeller; 6, filter screen; 7, liquid supply main pipe; 8, intermittent rotation part; 81, driving motor; 82, first bevel gear; 83, second bevel gear; 84, Geneva mechanism; 9. Cleaning section; 91. Mounting rod; 92. Scraper; 93. Pressure ring; 10. Enter the hole; 11. Scraper bar. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] like Figures 1-3 As shown, the anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to an embodiment of the present invention includes a spray pipe 1 and an anti-clogging part 4.

[0025] Spray pipe 1 is installed in desulfurization tower 2. One end of spray pipe 1 is connected to liquid supply unit 3, and the other end of spray pipe 1 is used to spray out desulfurization slurry. The anti-clogging part 4 includes a fixing rod 41, a connecting rod 42, a sealing plate 43, and an elastic element 44. The fixing rod 41 is disposed on the inner wall of the spray pipe 1 and is connected to one end of the connecting rod 42. The sealing plate 43 is sleeved on the other end of the connecting rod 42. The sealing plate 43 is used to seal the slurry spraying end of the spray pipe 1. The elastic element 44 is connected between the sealing plate 43 and the fixing rod 41. When the spray pipeline is stopped, the sealing plate 43 closes the slurry spraying end of the spray pipe 1 under the tension of the elastic element 44. When the spray pipeline is working, the sealing plate 43 opens the slurry spraying end of the spray pipe 1 under the pressure of the slurry.

[0026] The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant, as described in this invention, directly blocks the backflow path of corrosive gases and dust through the shutdown sealing function of the sealing plate, solving the problem of easy pipeline blockage after shutdown. This ensures continuous pipeline unobstructed flow, eliminating the need for frequent cleaning of blockages, ensuring the atomization effect and sulfur absorption efficiency of the spray system, and reducing the probability of equipment failure and downtime. No additional power source is required; automatic switching is achieved solely through the balance of elastic force and slurry pressure, resulting in low maintenance costs and high operational reliability. It also reduces the erosion of the spray pipe's inner wall by corrosive gases, lowering pipeline losses and indirectly reducing equipment maintenance and replacement costs.

[0027] Specifically, when the spray pipeline starts to supply liquid, the desulfurization slurry transported by the liquid supply part 3 enters the spray pipe 1, forming a continuous slurry pressure. The slurry pressure is greater than the tension of the elastic member 44, which pushes the closing plate 43 to move outward of the spray port, and opens the spray outlet end of the spray pipe 1. After the spray pipeline stops supplying liquid, the slurry pressure disappears, and the tension of the elastic member 44 becomes the dominant force. The elastic member 44 pulls the closing plate 43, and through the conduction of the connecting rod 42, the closing plate 43 is tightly attached to the slurry spray end of the spray pipe 1. The closing plate 43 completely closes the spray port, blocks the contact channel between the corrosive gas and dust inside the desulfurization tower 2 and the inside of the spray pipeline, and avoids backflow.

[0028] Further, the elastic member 44 can be selected as a spring, and the spring is sleeved on the connecting rod 42.

[0029] Further, the connecting rod 42 is fixedly connected with the fixed rod 41.

[0030] Further, the liquid supply part 3 is a prior art and will not be described again.

[0031] In some embodiments, as shown in Figure 2 、 Figure 3 Further, the diffusion part 5 is arranged at the slurry spray end of the spray pipe 1, and the diffusion part 5 comprises: a diffusion ball head 51, which is arranged in communication at the slurry spray end, and the closing plate 43 is located inside the diffusion ball head 51; a plurality of spray holes 52, which are uniformly arranged on the diffusion ball head 51, and the plurality of spray holes 52 are used for uniformly spraying the desulfurization slurry in the desulfurization tower 2.

[0032] The anti-blocking device for the spray pipeline of the desulfurization tower of the thermal power plant in the embodiment of the present application can form physical protection on the closing plate through the diffusion ball head, reduce the direct impact of the dust particles in the flue gas on the closing plate, reduce the wear of the anti-blocking part, prolong the service life of the device, and improve the operation stability. The plurality of uniform spray holes can refine the slurry into finer droplets, increase the specific surface area of the slurry, and make the misty slurry cover a wider range through the uniform distribution of the spray holes, so as to avoid the "dead angle" where the local flue gas does not contact the slurry, and greatly improve the absorption efficiency of sulfur elements. The flow guiding effect of the diffusion ball head avoids the "concentrated washing" phenomenon when the slurry is directly sprayed out, reduces the waste of the slurry adhering to the tower wall, improves the utilization rate of the slurry, and reduces the operation cost.

[0033] Specifically, when the device is stopped, the sealing of the sealing plate 43 to the spray pipe nozzle is not interfered by the diffusion structure, and the sealing plate can still completely block the backflow path of the corrosive gas and dust in the desulfurization tower 2, thereby avoiding pipeline blockage from the root, and the diffusion ball head 51 only acts as a "protective shell" at this time and does not participate in sealing, but can reduce the direct impact of external impurities on the sealing plate, thereby indirectly protecting the core components of the anti-blocking part 4. When the spray pipeline starts to supply liquid, the desulfurization slurry transported by the liquid supply part 3 enters the spray pipe 1, and the slurry pressure formed is greater than the pulling force of the elastic member 44, which pushes the sealing plate 43 to move to the inside of the diffusion ball head 51, and opens the spray pipe nozzle. After the desulfurization slurry is sprayed from the spray pipe nozzle, it enters the hollow inside of the diffusion ball head 51, and the arc structure of the diffusion ball head plays a "diversion and dispersion" role, uniformly guiding the concentrated slurry flow to the multiple spray holes 52 on the spherical surface. The multiple evenly distributed spray holes 52 further refine and atomize the slurry, forming a more widely covered and more uniform particle mist slurry, which fully contacts the sulfur-containing flue gas in the desulfurization tower and completes the absorption of sulfur elements.

[0034] In some embodiments, as shown in Figure 2 、 Figure 3 The diffusion part 5 further includes a centrifugal impeller 53 rotatably sleeved on the connecting rod 42, and the centrifugal impeller 53 is arranged between the sealing plate 43 and the elastic member 44. The centrifugal impeller 53 is used to disturb the flow of the desulfurization slurry, so as to enhance the hydraulic flushing of the slurry to the inside of the diffusion ball head 51 and the spray holes 52, and prevent the spray holes 52 from being blocked.

[0035] The anti-blocking device for the spray pipeline of the desulfurization tower of the thermal power plant in the embodiment of the application can make the slurry droplets smaller and more uniform through the disturbance flow generated by the rotation of the impeller, increase the specific surface area of the slurry, ensure that all the spray holes can normally spray, avoid "spray dead angles" caused by the blockage of part of the spray holes, form a more dense spray layer of the mist slurry in the desulfurization tower, and greatly improve the contact area and reaction time of the mist slurry with the flue gas, thereby further improving the desulfurization efficiency compared with the simple diffusion part.

[0036] Specifically, after the slurry is sprayed from the nozzle, the slurry directly impacts the blades of the centrifugal impeller 53 during the process of flowing along the connecting rod 42 to the diffusion ball head 51; since the centrifugal impeller 53 is not fixedly constrained (rotating sleeve set), the impact force of the slurry drives the impeller to rotate at high speed. On the one hand, the smooth flow state of the slurry in the diffusion ball head 51 is broken, so that the slurry changes from "concentrated flow" to "turbulent rotating flow", and the scouring force of the slurry on the inner wall of the diffusion ball head is enhanced; on the other hand, the disturbed slurry impacts each spray hole 52 with higher flow rate and more uniform distribution, and through continuous hydraulic scouring, the slurry impurities (such as undissolved desulfurizer particles) and desulfurization reaction products (such as sulfate crystals) that may be deposited on the inner wall of the spray hole are removed from the source to avoid blockage of the spray hole. At the same time, the impeller disturbance further refines the particle size of the slurry droplets, so that the misty slurry sprayed by multiple uniformly distributed spray holes covers a more dense area and has a wider contact range, and the reaction efficiency with the sulfur-containing flue gas is further improved.

[0037] Further, the centrifugal impeller 53 is rotatably connected with a connecting ring, the connecting ring is slidingly sleeved on the connecting rod 42, the lower end of the elastic member 44 is connected with the connecting ring, and the lower end of the centrifugal impeller 53 is rotatably connected with the closing plate 43.

[0038] In some embodiments, as shown in Figure 2 Further, as shown in the drawings, a plurality of filter screens 6 are arranged along the height direction of the desulfurization tower 2, the filter screens 6 are used for filtering the flue gas passing through the desulfurization tower, and a plurality of spray pipes 1 are arranged on the upper side of each filter screen 6, and the desulfurization slurry sprayed by the spray pipes 1 is used for scouring the filter screens 6.

[0039] The power plant desulfurization tower spray pipe anti-blocking device provided by the embodiment of the application can intercept dust and large-particle impurities in advance through the multiple filter screens, so as to pretreat the flue gas, reduce the dust adhesion of the subsequent spray system and the inner wall of the desulfurization tower, indirectly strengthen the anti-blocking effect of the previous anti-blocking part and the centrifugal impeller, and reduce the wear and maintenance frequency of the core components. The spray pipes on the upper side of the filter screens are directly scoured by the desulfurization slurry, the existing spray system is reused, no additional cleaning pump, nozzle and other devices need to be configured, the "desulfurization and cleaning integration" is realized, the manual cleaning frequency and shutdown maintenance time of the filter screens are greatly reduced, and the operation and maintenance cost and labor intensity are reduced.

[0040] Specifically, the sulfur-containing flue gas enters from the lower part of the desulfurization tower 2, flows upward along the tower body height, and passes through each layer of filter screen 6 in turn. The filter screen 6 intercepts the dust, fly ash, solid particles (such as sulfate crystals) generated by the desulfurization reaction and other impurities in the flue gas that have not been treated in the previous stage, achieving staged purification of the flue gas and avoiding large-particle impurities from rising directly to the top of the tower or adhering to the surface of the equipment in the subsequent spray area. The spray pipe 1 on the upper side of each layer of filter screen atomizes the desulfurization slurry into fine droplets through the diffusion part 5 (including the centrifugal impeller 53), and a part of the droplets directly contacts and reacts with the rising flue gas; another part of the droplets falls on the surface of the filter screen 6, forming a uniform liquid film. When the flue gas passes through the filter screen 6, it not only contacts the atomized droplets, but also passes through the liquid film on the surface of the filter screen 6, greatly increasing the gas-liquid contact area (the pore structure of the filter screen further divides the flue gas and the liquid film, prolonging the contact time), achieving staged desulfurization and deep purification. The desulfurization slurry continuously sprayed by the spray pipe 1 washes the upper surface of the filter screen 6 at a certain pressure. The washing force can timely strip the dust, solid impurities and reaction deposits adhered to the filter screen, avoiding the blockage of the filter screen pores; the impurities washed down are dropped with the slurry to the bottom of the desulfurization tower (which can be recycled or treated), realizing online self-cleaning of the filter screen without the need for additional cleaning devices.

[0041] In some embodiments, as shown in Figure 1 、 Figure 2 Further comprising a liquid supply main pipe 7, the liquid supply main pipe 7 is arranged in the desulfurization tower 2, one end of the liquid supply main pipe 7 is in communication with the liquid supply part 3, the spray pipe 1 is arranged on the liquid supply main pipe 7 and in communication with the liquid supply main pipe 7, and the liquid supply main pipe 7 is used to supply the desulfurization slurry into the plurality of spray pipes 1.

[0042] The power plant desulfurization tower spray pipe anti-blocking device of the embodiment of the present application, with the addition of multiple layers of filter screens, the number of spray pipes is greatly increased (multiple spray pipes are arranged for each layer of filter screen). If all the spray pipes are directly connected with the liquid supply part, it will cause the pipe in the desulfurization tower to be messy and the number of interfaces to be large, which not only makes the installation difficult, but also is prone to problems such as slurry leakage and pipe wear. The arrangement of the liquid supply main pipe simplifies the structure of the direct connection of multiple pipes with the liquid supply part to the structure of the connection of a single main pipe with multiple branch pipes, the pipe layout is more regular and orderly, the number of interfaces and the length of the pipe are reduced, and the installation complexity and the risk of leakage are reduced.

[0043] Specifically, after the liquid supply part 3 is started, the desulfurization slurry is pressurized and delivered to the liquid supply main pipe 7, and the slurry forms a stable flow pressure field in the main pipe; through the multiple branch interfaces on the liquid supply main pipe 7, the slurry is uniformly distributed to all the spray pipes 1 (including the spray pipes on the upper side of each layer of filter screen 6), ensuring that the slurry pressure and flow rate obtained by each spray pipe are consistent.

[0044] In some embodiments, as shown in Figure 2As shown, the intermittent rotating part 8 is connected with the liquid supply main pipe 7, and is used to drive the intermittent rotation of the liquid supply main pipe 7, so that the spray pipe 1 moves intermittently in the desulfurization tower 2, and the desulfurization slurry is uniformly sprayed in the desulfurization tower 2.

[0045] The power plant desulfurization tower spray pipe anti-blocking device provided by the embodiment of the present application realizes dynamic spraying of the spray pipe through the setting of the intermittent rotating part, the relative movement of the flue gas and the slurry is more sufficient, the contact frequency and the contact time are significantly increased, meanwhile, the liquid film on the surface of the filter screen is more uniform under the dynamic flushing, the gas-liquid contact efficiency is further improved when the flue gas passes through the filter screen, the overall desulfurization efficiency and the dust removal rate are greatly improved compared with the fixed spraying, and the strict environmental protection emission requirements are more easily met.

[0046] Specifically, after the intermittent rotating part 8 is started, the liquid supply main pipe 7 is driven to rotate at a set frequency, and the spray pipe 1 moves intermittently in the desulfurization tower 2 synchronously with the liquid supply main pipe 7.

[0047] Further, as shown in Figure 6 , the bottom of the desulfurization tower 2 is provided with a base, the bottom end of the liquid supply main pipe 7 is a closed end, the bottom end of the liquid supply main pipe 7 extends out of the desulfurization tower 2, the intermittent rotating part 8 includes a driving motor 81 arranged on the base, the output end of the driving motor 81 is fixedly connected with a first bevel gear 82, a second bevel gear 83 is rotatably connected to the base, the second bevel gear 83 is engaged with the first bevel gear 82, and a notched wheel mechanism 84 is connected between the second bevel gear 83 and the liquid supply main pipe 7, the notched wheel mechanism includes a driving disc and a driven notched wheel, the driving disc is fixedly sleeved on the rotating shaft of the second bevel gear 83, and the rotating shaft of the driven notched wheel is fixedly connected with the liquid supply main pipe 7 in a coaxial manner.

[0048] Specifically, when the liquid supply main pipe 7 needs to be rotated, the driving motor 81 is started, the output end of the driving motor 81 drives the first bevel gear 82 to rotate, the first bevel gear 82 drives the second bevel gear 83 to rotate, the second bevel gear 83 drives the driving disc to rotate through the rotating shaft connected therewith, and the driving disc drives the liquid supply main pipe 7 to rotate intermittently through the driven notched wheel.

[0049] Further, the notched wheel mechanism 84 is prior art, and will not be described here.

[0050] In some embodiments, as shown in Figure 2 , Figure 4 , at least two cleaning parts 9 are further included, the at least two cleaning parts are symmetrically arranged on the upper and lower sides of the filter screen 6, and the cleaning part 9 includes a plurality of mounting rods 91 and a plurality of scrapers 92.

[0051] The plurality of mounting rods 91 are arranged on the liquid supply main pipe 7 in a circumferential direction and are spaced apart; A plurality of scrapers 92 correspond to a plurality of mounting rods 91, the scraper 92 is in contact with the filter screen 6, and the scraper 92 is used to scrape the attachments on the surface of the filter screen 6.

[0052] The power plant desulfurization tower spray pipeline anti-blocking device provided by the embodiment of the present application can remove stubborn attachments that are difficult to remove by spray flushing through the cooperation of slurry flushing and mechanical scraping, and the upper and lower scraping plates cover no cleaning dead angle, thereby fundamentally ensuring the smoothness of the filter screen; the intermittent rotation of the liquid supply main pipe is used as the driving source, so that no additional power source is needed, the energy consumption and equipment complexity are reduced, the mechanical scraping avoids the long-term accumulation and corrosion of the attachments or the extrusion of the filter screen, the risk of filter screen damage is reduced, and the replacement cost is reduced. Specifically, the cleaning part 9 is fixed with the liquid supply main pipe 7 through the mounting rod 91 and moves synchronously with the intermittent rotation of the liquid supply main pipe; the scraping plates 92 symmetrically arranged on the upper and lower sides of the filter screen 6 are always in close contact with the surface of the filter screen; when the liquid supply main pipe rotates intermittently, the scraping plates 92 move along the surface of the filter screen in a circular scraping motion, and the dust, desulfurization reaction deposits and other impurities attached to the two sides of the filter screen are directly scraped off; in cooperation with the slurry flushing of the upper spray pipe 1 of the filter screen, the scraped impurities fall to the bottom of the desulfurization tower with the slurry, and the cleaning of the filter screen is completed.

[0053] Further, the mounting rod 91 is fixedly connected with the liquid supply main pipe 7.

[0054] In some embodiments, as shown in Figure 4 The cleaning part 9 further includes a pressing ring 93 arranged on the inner wall of the desulfurization tower 2, the pressing ring 93 is located on the side of the mounting rod 91 away from the filter screen 6, and the pressing ring 93 is used to keep the scraping plate 92 in contact with the surface of the filter screen 6.

[0055] The power plant desulfurization tower spray pipeline anti-blocking device provided by the embodiment of the present application can remove stubborn attachments that are difficult to remove by spray flushing through the cooperation of slurry flushing and mechanical scraping, and the upper and lower scraping plates cover no cleaning dead angle, thereby fundamentally ensuring the smoothness of the filter screen; the intermittent rotation of the liquid supply main pipe is used as the driving source, so that no additional power source is needed, the energy consumption and equipment complexity are reduced, the mechanical scraping avoids the long-term accumulation and corrosion of the attachments or the extrusion of the filter screen, the risk of filter screen damage is reduced, and the replacement cost is reduced. Specifically, the pressing ring 93 fixed on the inner wall of the desulfurization tower 2 continuously presses the side of the mounting rod 91 away from the filter screen 6, and the pressure is conducted through the mounting rod 91, so that the scraping plate 92 is always closely attached to the surface of the filter screen 6.

[0056] In some embodiments, as shown in Figure 2 A plurality of access holes 10 are formed in the bottom of the desulfurization tower 2, and the access holes 10 are used for the flue gas to enter the desulfurization tower 2.

[0057] The power plant desulfurization tower spray pipeline anti-blocking device provided by the embodiment of the present application can remove stubborn attachments that are difficult to remove by spray flushing through the cooperation of slurry flushing and mechanical scraping, and the upper and lower scraping plates cover no cleaning dead angle, thereby fundamentally ensuring the smoothness of the filter screen; the intermittent rotation of the liquid supply main pipe is used as the driving source, so that no additional power source is needed, the energy consumption and equipment complexity are reduced, the mechanical scraping avoids the long-term accumulation and corrosion of the attachments or the extrusion of the filter screen, the risk of filter screen damage is reduced, and the replacement cost is reduced. Specifically, the sulfur-containing flue gas enters the desulfurization tower from the bottom through the multiple entry holes 10, and flows upwards along the tower body, and sequentially passes through the multiple layers of filter screens 6, and fully contacts the atomized desulfurization slurry sprayed by the upper side of the spray pipe 1 of each layer of filter screens, so as to complete the absorption of sulfur and the filtration of dust.

[0058] In some embodiments, as shown in Figure 2 The bottom of the desulfurization tower 2 is conical, and the supply liquid main pipe 7 is provided with a scraper rod 11 which is attached to the bottom of the desulfurization tower 2, and the scraper rod 11 is used to scrape off the attachments on the bottom of the desulfurization tower 2.

[0059] The power plant desulfurization tower spray pipe line anti-blocking device of the embodiment of the application solves the problem of blockage caused by slurry deposition and hardening at the bottom of the tower through the conical structure and the scraping of the scraper rod, and ensures smooth slurry discharge or recovery.

[0060] Specifically, when the supply liquid main pipe rotates, the scraper rod 11 is scraped along the conical bottom to scatter and remove the deposited attachments (slurry deposits, solid impurities).

[0061] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0062] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0063] In the present application, unless specifically defined otherwise, the terms "mount", "connected", "connecting", "fixed", "unfixed", and the like should be construed broadly and can include fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or communication connections between each other; direct connections, or indirect connections via an intermediate medium; or internal communication between two elements or interaction between two elements. The specific meanings of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.

[0064] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediate medium. Moreover, the first feature "above", "over", and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under", and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0065] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0066] Although the above embodiments have been shown and described, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Changes, modifications, replacements, and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A device for preventing blockage of spray pipelines in desulfurization towers of thermal power plants, characterized in that, include: Spray pipe (1), the spray pipe (1) is used to be installed in desulfurization tower (2), one end of the spray pipe (1) is connected to the liquid supply unit (3), and the other end of the spray pipe (1) is used to spray out desulfurization slurry; The anti-clogging part (4) includes a fixing rod (41), a connecting rod (42), a sealing plate (43), and an elastic element (44). The fixing rod (41) is disposed on the inner wall of the spray pipe (1). The fixing rod (41) is connected to one end of the connecting rod (42). The sealing plate (43) is sleeved on the other end of the connecting rod (42). The sealing plate (43) is used to seal the slurry spraying end of the spray pipe (1). The elastic element (44) is connected between the sealing plate (43) and the fixing rod (41). When the spray pipeline is stopped, the sealing plate (43) closes the slurry spraying end of the spray pipe (1) under the pulling force of the elastic element (44). When the spray pipeline is working, the sealing plate (43) opens the slurry spraying end of the spray pipe (1) under the pressure of the slurry.

2. The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to claim 1, characterized in that, It also includes a diffusion section (5), which is disposed at the slurry spraying end of the spray pipe (1), and the diffusion section (5) includes: A diffuser head (51) is connected to the slurry ejection end, and a sealing plate (43) is located inside the diffuser head (51). Multiple nozzles (52) are evenly distributed on the diffuser head (51) and are used to evenly spray the desulfurization slurry into the desulfurization tower (2).

3. The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to claim 2, characterized in that, The diffuser (5) also includes a centrifugal impeller (53) rotatably mounted on the connecting rod (42). The centrifugal impeller (53) is disposed between the sealing plate (43) and the elastic member (44). The centrifugal impeller (53) is used to turbulent the desulfurization slurry to enhance the hydraulic scouring of the slurry on the inside of the diffuser head (51) and the nozzle (52) and prevent the nozzle (52) from being blocked.

4. The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to claim 1, characterized in that, It also includes multiple filter screens (6), which are spaced apart along the height direction of the desulfurization tower (2). The filter screens (6) are used to filter the flue gas passing through the desulfurization tower. Multiple spray pipes (1) are provided on the upper side of each filter screen (6), and the desulfurization slurry sprayed from the spray pipes (1) washes the filter screen (6).

5. The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to claim 4, characterized in that, It also includes a liquid supply main pipe (7), which is installed in the desulfurization tower (2). One end of the liquid supply main pipe (7) is connected to the liquid supply section (3). The spray pipe (1) is installed on the liquid supply main pipe (7) and connected to the liquid supply main pipe (7). The liquid supply main pipe (7) is used to supply the desulfurization slurry into multiple spray pipes (1).

6. The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to claim 5, characterized in that, It also includes an intermittent rotating part (8), which is connected to the liquid supply main pipe (7). The intermittent rotating part (8) is used to drive the liquid supply main pipe (7) to rotate intermittently so that the spray pipe (1) moves intermittently in the desulfurization tower (2) so that the desulfurization slurry is sprayed evenly inside the desulfurization tower (2).

7. The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to claim 6, characterized in that, It also includes at least two cleaning sections (9), which are symmetrically arranged on the upper and lower sides of the filter screen (6). The cleaning section (9) includes: Multiple mounting rods (91) are spaced apart along the circumferential direction on the liquid supply main pipe (7); Multiple scrapers (92) are provided, each corresponding to one of the mounting rods (91). The scrapers (92) are in contact with the filter screen (6) and are used to scrape off the deposits on the surface of the filter screen (6).

8. The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to claim 7, characterized in that, The cleaning section (9) also includes a pressure ring (93) disposed on the inner wall of the desulfurization tower (2). The pressure ring (93) is located on the side of the mounting rod (91) away from the filter screen (6). The pressure ring (93) is used to keep the scraper (92) in contact with the surface of the filter screen (6).

9. The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to claim 6, characterized in that, The desulfurization tower (2) has multiple inlet holes (10) at the bottom, which are used for flue gas to enter the desulfurization tower (2).

10. The anti-clogging device for the spray pipeline of the desulfurization tower in a thermal power plant according to claim 9, characterized in that, The bottom of the desulfurization tower (2) is conical, and a scraper (11) is provided on the liquid supply main pipe (7). The scraper (11) is attached to the bottom of the desulfurization tower (2) and is used to scrape off the deposits at the bottom of the desulfurization tower (2).

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