A circulating fluidized bed boiler denitration system and a denitration atomizing lance thereof

Abstract

The present application belongs to the technical field of waste gas purification, in particular to a circulating fluidized bed boiler denitration system and a denitration atomizing lance thereof, comprising a denitration tower, a preheating device, a spraying device and a catalytic device; further comprising an ash removal box, the ash removal box is installed in the tower body above the catalytic device, and air vents are uniformly arranged on the top of the ash removal box, the air vents are annularly and uniformly distributed, the ash removal box is hollow inside and has an opening at the bottom; a motor drives a fan blade to rotate through a drive shaft, the rotating fan blade sends the mixed gas into the catalytic device, on the one hand, the power of the flow of the mixed gas is increased, and the denitration efficiency is improved, on the other hand, the mixed gas contacts the air suction surface of the fan blade, the fan blade sends away the gas in the mixed gas, the impurities formed by the ammonia liquid drops and the waste gas in the mixed gas are attached to the air suction surface of the fan blade, the impurities in the mixed gas are reduced, the catalytic device is prevented from being blocked due to the viscous impurities, at the same time, the impurities are prevented from entering the catalytic device and adhering to the surface of the catalyst, and the catalytic effect is affected.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of waste gas purification, in particular to a circulating fluidized bed boiler denitration system and a denitration atomizing lance thereof. BACKGROUND

[0002] The circulating fluidized bed boiler denitration system is mainly used for reducing the emission of nitrogen oxides, which comprises an SCR system mainly composed of an SCR reactor, a catalyst, a reducing agent supply system, an ammonia injection grid, a control system and the like, and its principle is that under the action of the catalyst, the reducing agent, usually ammonia, reacts with nitrogen oxides to generate nitrogen and water, and the denitration efficiency is high, which can reach more than 80%; the SCR system is composed of a denitration tower body, a preheating device, a spraying device and a catalytic device, the preheating device is used for preheating the waste gas entering the denitration tower, the waste gas flows upward from the bottom of one side of the tower body after passing through the preheating device, contacts the spraying device in the process of flowing upward, the reducing agent sprayed by the spraying device is mixed into the waste gas, and then the mixed gas flow changes to downward flow to the other side of the tower body, passes through the catalytic device or passes through the heating device before the catalytic device, and under the catalytic action of the catalyst, the reducing agent reacts with the waste gas to generate nitrogen and water, thereby completing the denitration purification of the waste gas.

[0003] However, in the process of using the reducing agent, dry ammonia is sprayed in a gaseous state, the risk of caking is low, but ammonia escape is prone to occur, the safety is low; compared with gaseous spraying, the risk of ammonia escape is reduced when humid gas mist, ammonia water, is sprayed in a gas mist form, which is safer; when ammonia mist is selected as the reducing agent, the atomized droplets of the ammonia mist are not completely evaporated, residual moisture is mixed with flue gas fly ash and other substances to form viscous ammonium salt, which is adsorbed on the surface of the catalyst to affect the use efficiency of the catalyst, frequent offline cleaning is required, and the waste gas denitration efficiency is reduced; in addition, the ammonium salt and the fly ash also form caked substances, which easily block the pores of the catalyst, and the difficulty of cleaning is great, which also affects the catalytic reaction and the denitration effect. SUMMARY

[0004] In order to make up for the deficiencies of the prior art and solve the above technical problems, the present application provides a circulating fluidized bed boiler denitration system and a denitration atomizing lance thereof.

[0005] The technical scheme adopted by the present application to solve the technical problems is that the present application provides a circulating fluidized bed boiler denitration system and a denitration atomizing lance thereof, which comprises a denitration tower composed of a tower body, a preheating device, a spraying device and a catalytic device; further comprising:

[0006] In addition, the ash removal box is internally hollow and has an opening at the bottom.

[0007] The lifting device is installed on the top of the tower body, and the motor is located between the lifting device and the top of the tower body, and the lifting end of the lifting device drives the motor to lift.

[0008] Preferably, the ash removal box is provided with a jet plate above the ash removal box, and the edge of the jet plate is connected with the inner wall of the tower body, the jet plate is internally provided with a jet hole, and the jet plate is internally provided with a jet pipe, one end of the jet pipe is communicated with the gas supply device installed on one side of the tower body, and the other end is located on the inner wall of the jet hole and is communicated with the jet hole, and the gas supply device sprays protective gas into the jet hole.

[0009] Preferably, the jet hole is internally rotatably connected with a rotating shaft, and the top of the rotating shaft is cylindrical, and the lower part is flat.

[0010] Preferably, the jet pipe is located on the side wall of the jet hole, and the jet pipe is connected with a diffusion nozzle at one end of the jet hole, the diffusion nozzle is inclined, the inner part of the diffusion nozzle is partitioned into a plurality of jet channels with different diameters, the middle part is conical, and the two side parts are cylindrical.

[0011] Preferably, the rotating shaft is provided with a scraper rod, and the scraper rod contacts the inner wall of the jet hole.

[0012] Preferably, the scraper rods are distributed near the top and bottom of the rotating shaft, and a pull rope is arranged between adjacent scraper rods, and the pull rope contacts the inner wall of the jet hole.

[0013] Preferably, the inner wall of the top of the ash removal box is provided with an ash removal piece, and the bottom of the ash removal piece contacts one side of the scraper, and the bottom of the ash removal piece is located above the fan blade.

[0014] Preferably, the top of the backing plate is uniformly provided with a baffle, and the baffle is arranged along the hole edge on the backing plate, the side wall of the baffle and the top of the backing plate form a groove, and a part of the baffle is located below the ash removal sheet, and the baffle below the ash removal sheet is linearly arranged towards the center of the backing plate.

[0015] Preferably, the top of the baffle is uniformly provided with a combing groove, and the cleaning brush extends into the combing groove.

[0016] A denitration atomizing spray gun for a circulating fluidized bed boiler is installed in a tower body, and the atomizing spray gun is contained in a spraying device, and the atomizing spray gun sprays a reducing agent upwards of the tower body.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. The circulating fluidized bed boiler denitration system and the denitration atomizing spray gun thereof, after the waste gas passes through the spraying device, the waste gas and the ammonia gas mist form a mixed gas, the mixed gas passes through the air passage into the ash removal box, the motor drives the fan blade to rotate through the drive shaft, the rotation of the fan blade sends the mixed gas into the catalytic device, on the one hand, the power of the flow of the mixed gas is increased, and the denitration efficiency is improved, on the other hand, the mixed gas contacts the air suction surface of the fan blade, the fan blade sends away the gas in the mixed gas, the impurities formed by the ammonia liquid drops in the mixed gas and the waste gas are attached to the air suction surface of the fan blade, the impurities in the mixed gas are reduced, the catalytic device is prevented from being blocked by the viscous impurities, and the catalytic effect is affected by the impurities adhering to the surface of the catalyst.

[0019] 2. The circulating fluidized bed boiler denitration system and the denitration atomizing spray gun thereof, the guide ring is wave-shaped, that is, the wave-shaped top of the guide ring connects the top of the outer edge of the fan blade, and the wave-shaped bottom of the guide ring connects the bottom of the outer edge of the fan blade, when the guide ring rotates, since the bottom of the scraper is in contact with the top of the guide ring through the ball bearing, and the scraper can only slide up and down, the guide ring can extrude the scraper to rise and fall, so that the bottom of the scraper can adapt to the air suction surface of the fan blade while scraping the impurities, thereby cleaning the surface of the fan blade and reducing the accumulation of impurities, which is helpful for the fan blade to continuously collect the impurities in the mixed gas. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below with reference to the drawings.

[0021] Figure 1 is a perspective view of the present application;

[0022] Figure 2 is an internal schematic view of the present application;

[0023] Figure 3 is a partial enlarged view of Figure 2 ; is a sectional view of the side view direction of

[0024] Figure 4 is a sectional view of the side view direction of Figure 2 ;

[0025] Figure 5 is a sectional view of the downward direction of the observation window;

[0026] Figure 6 is an internal schematic view of the air injection hole;

[0027] Figure 7 is an internal schematic view of the ash removal box;

[0028] Figure 8 is a schematic view of the distribution of the blocking pieces on the pad;

[0029] Figure 9 is a sectional view of the downward direction of the diffusion nozzle.

[0030] In the figure: tower body 1, preheating device 11, spraying device 12, catalytic device 13, ash removal box 14, air vent 15, fan blade 16, motor 17, scraper 18, guide ring 19, lifting device 2, cleaning rod 21, pad 22, brush wire 23, observation window 24, air injection plate 25, air injection hole 26, air injection pipe 27, air supply device 28, rotating shaft 29, transmission shaft 3, transmission plate 31, diffusion nozzle 32, scraping rod 33, heating assembly 34, collection groove 35, dust removal rope 36, dust removal piece 37, blocking piece 38, carding groove 39. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings shown in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0032] Embodiment one:

[0033] In order to effectively solve the above problems, as shown in the drawings accompanying the specification Figures 1-9As shown, a circulating fluidized bed boiler denitration system, including a denitration tower, by the tower body 1, preheating device 11, spraying device 12 and catalytic device 13; the airflow passage inside the tower body 1 is inverted U-shaped, that is, after the preheating device 11 on one side of the tower body 1 is discharged, it flows from bottom to top first, passes through the spraying device 12, reaches the other side of the tower body 1, and changes the flow direction to flow from top to bottom, contacts the catalytic device 13 during the flow process to start the reaction, and the gas after the reaction flows to the bottom of the tower body 1 and is collected; the preheating device 11, the spraying device 12 and the catalytic device 13 are components commonly configured for the denitration tower, the preheating device 11 is used to heat the exhaust gas to a preset temperature to avoid low exhaust gas temperature, when the spraying device 12 sprays ammonia gas mist, the exhaust gas with low temperature is not enough to effectively evaporate the mist and produce a reaction; the spraying device 12 is used to deliver ammonia water into the tower body 1 and has sprayed ammonia gas mist through the uniformly arranged atomizing spray gun; the catalytic device 13 is used to store catalysts for catalyzing the denitration reaction of the exhaust gas;

[0034] Further comprising:

[0035] The ash removal box 14 is installed in the tower body 1 above the catalytic device 13, and the top of the ash removal box 14 is uniformly provided with air vents 15, the air vents 15 are uniformly distributed in a ring shape, the inside of the ash removal box 14 is hollow and has an opening at the bottom; the ash removal box 14 is rotatably connected with a fan blade 16, and the central shaft of the fan blade 16 is connected with a motor 17 installed outside the top of the tower body 1 through a drive shaft; the top inner wall of the ash removal box 14 is provided with a scraper 18, the scraper 18 is slidingly connected with the ash removal box 14 through a spring, the bottom of the scraper 18 contacts the top of the fan blade 16, and the outer edge of the fan blade 16 is sleeved with a guide ring 19, and the bottom of the scraper 18 contacts the top of the guide ring 19 through a ball bearing;

[0036] The lifting device 2 is installed on the top of the tower body 1, and the motor 17 is located between the lifting device 2 and the top of the tower body 1, and the lifting end of the lifting device 2 drives the motor 17 to lift; the bottom of the guide ring 19 is provided with a cleaning rod 21, the top of the catalytic device 13 is provided with a pad 22, a plurality of holes are uniformly arranged on the pad 22 and coincide with the holes in the catalytic device 13, the cleaning rod 21 contacts the pad 22 through a brush wire 23, and the pad 22 is arc-shaped with a high center and a low edge; the tower body 1 is provided with an observation window 24 close to the pad 22;

[0037] The motor 17 is a conventional power device, and the lifting device 2 is connected with the shell of the motor 17 in a conventional manner, for example, the motor 17 is fixed on a plate, and the lifting device 2 is connected with the plate to indirectly drive the motor 17 to lift; the motor 17 is connected with the fan blade 16 in a conventional connecting manner, for example, through a driving shaft, and the connecting strength between the driving shaft and the motor 17 is sufficient to support the lifting of the fan blade 16 and other components; the catalytic device 13 is uniformly provided with holes communicating with the top and the bottom for the exhaust gas to pass through; the surface of the fan blade 16 close to the air passage 15 is the air suction surface of the fan blade 16, and the surface of the fan blade 16 close to the catalytic device 13 is the air supply surface of the fan blade 16.

[0038] Specific working process: After the exhaust gas passes through the spraying device 12, the exhaust gas and the ammonia gas mist form a mixed gas, the mixed gas passes through the air passage 15 into the ash removal box 14, the motor 17 drives the fan blade 16 to rotate through the driving shaft, and the fan blade 16 rotates to send the mixed gas into the catalytic device 13, which on the one hand increases the flow power of the mixed gas and improves the denitration efficiency, and on the other hand, the mixed gas contacts the air suction surface of the fan blade 16, and the fan blade 16 sends away the gas in the mixed gas, and the impurities formed by the ammonia liquid drops in the mixed gas and the exhaust gas adhere to the air suction surface of the fan blade 16, reducing the impurities in the mixed gas, reducing the blockage of the catalytic device 13 due to viscous impurities, and avoiding the impurities entering the catalytic device 13 and adhering to the surface of the catalyst, affecting the catalytic effect;

[0039] The rotation of the fan blade 16 drives the guide ring 19 to rotate, and the outer edge of the guide ring 19 is rotationally connected to the inner wall of the ash removal box 14, so that the guide ring 19 is stably rotated on the inner wall of the ash removal box 14, and the outer edge of the fan blade 16 is connected and stabilized through the guide ring 19, thereby improving the rotation stability and avoiding excessive adhesion of impurities on the fan blade 16 during long-time rotation, which affects the rotation of the fan blade 16 and causes vibration, drives the catalytic device 13 to form resonance, and causes damage to the catalytic device 13 under the influence of long-time resonance, thereby improving the denitration effect;

[0040] Further, the guide ring 19 is in a wave shape, that is, the wave-shaped top of the guide ring 19 is connected to the top of the outer edge of the fan blade 16, and the wave-shaped bottom is connected to the bottom of the outer edge of the fan blade 16, and when the guide ring 19 rotates, the bottom of the scraper 18 is in contact with the top of the guide ring 19 through the ball, and the scraper 18 can only slide up and down, so that the guide ring 19 can extrude the scraper 18 to rise and fall, so that the bottom of the scraper 18 can adapt to the air suction surface of the fan blade 16 while scraping the impurities, thereby cleaning the surface of the fan blade 16 and reducing the accumulation of impurities, which is helpful for the fan blade 16 to continuously collect the impurities in the mixed gas;

[0041] In the denitration process, the denitration tower needs to be kept in the range of 300-400℃. If the denitration tower needs to be stopped for cleaning, a series of operations such as cooling, disassembly, cleaning, installation, and heating are needed in between, which reduces the working efficiency of continuous denitration. Therefore, by setting a gasket 22 on the top of the catalytic device 13, the impurities remaining in the mixed gas are attached to the gasket 22, reducing the amount of impurities entering the catalytic device 13, reducing the risk of the catalytic device 13 being blocked and disturbed, reducing the number of cleaning stops, and improving the denitration efficiency. The guide ring 19 rotates to drive the cleaning rod 21 to rotate, and the cleaning rod 21 drives the brush wire 23 to sweep the gasket 22 on the top of the catalytic device 13. If the hole on the gasket 22 coincides with the catalytic device 13 is blocked, it can also be cleaned and removed by the brush wire 23. The brush wire 23 is a conventional type that can withstand 400℃ high temperature. The brush wire 23 contacts the gasket 22, cleans the impurities, reduces the contact between the brush wire 23 and the catalyst or catalytic module in the catalytic device 13, reduces the damage to the catalytic device 13, improves the airflow smoothness in the denitration process, avoids impurities attached to the surface of the hole being blown into the catalytic device 13 due to excessive airflow pressure, and thus improves the catalytic efficiency.

[0042] By setting an observation window 24, the observation window 24 is a conventional configuration on the tower body 1. Workers can understand the formation of impurities in the mixed gas in time through the observation window 24. For example, according to the amount of impurities attached to the gasket 22, every denitration working cycle interval, open the observation window 24 and clean the gasket 22 carefully, and then in the denitration process, if the amount of impurities is too much, it indicates that the temperature when the exhaust gas contacts the ammonia gas mist is not enough to evaporate the water in the ammonia gas mist, or the effect of the pre-desulfurization device is insufficient, which helps workers to determine the cause and make adjustments.

[0043] After the brush wire 23 cleans the gasket 22, the lifting device 2 drives the motor 17, the fan blade 16 and the guide ring 19 to rise, the guide ring 19 drives the brush wire 23 to move away from the gasket 22, avoiding affecting the work of the catalytic device 13 by long-time brushing.

[0044] Example two:

[0045] On the basis of example one, a gas injection plate 25 is arranged above the ash removal box 14, the edge of the gas injection plate 25 is connected with the inner wall of the tower body 1, a gas injection hole 26 is formed in the gas injection plate 25, a gas injection pipe 27 is installed in the gas injection plate 25, one end of the gas injection pipe 27 is communicated with a gas supply device 28 installed on one side of the tower body 1, and the other end is located on the inner wall of the gas injection hole 26 and communicated with the gas injection hole 26. The gas supply device 28 sprays protective gas into the gas injection hole 26;

[0046] A rotating shaft 29 is rotatably connected inside the jet nozzle 26. The top of the rotating shaft 29 is cylindrical, and the lower part is flat. A transmission shaft 3 is rotatably connected to the bottom of the jet plate 25. A transmission plate 31 is provided on the top of the guide ring 19. The transmission plate 31 is in contact with one end of the transmission shaft 3, and the end of the transmission shaft 3 away from the transmission plate 31 is connected to the rotating shaft 29. The connection between the transmission plate 31 and the top of the transmission shaft 3 does not affect the fan blade 16 from driving the guide ring 19 and the transmission plate 31 to rise and fall. The connection between the transmission plate 31 and the rotating shaft 29 is, for example, through a bevel gear connection. A bevel gear is sleeved on the transmission shaft 3, and a bevel gear is sleeved on the bottom of the rotating shaft 29. The rotating shaft 29 is fixed inside the jet nozzle 26 by a bracket, and the bevel gears of the transmission shaft 3 and the rotating shaft 29 mesh with each other for transmission.

[0047] The jet pipe 27 faces the inner wall of the jet hole 26, and a diffuser nozzle 32 is connected to one end of the jet pipe 27 located at the jet hole 26. The diffuser nozzle 32 is inclined and the multiple jet channels inside the diffuser nozzle 32 have different diameters. The middle part is conical and the two sides are cylindrical.

[0048] The protective gas is a conventional gas used to improve the catalyst's resistance to sulfur poisoning, such as hydrogen. Hydrogen dissociates into H atoms on the catalyst surface, which react with adsorbed sulfate ions to generate inorganic acids, restoring catalyst activity, reducing the catalyst poisoning area, maintaining the overall catalyst activity, and improving denitrification efficiency. The gas supply device 28 is a conventional device for transporting and heating hydrogen at high temperature.

[0049] Specific workflow: Before the mixed gas enters the dust removal box 14, the mixed gas first passes through the jet hole 26 and jet plate 25. The gas supply device 28 sprays preheated hydrogen into the jet hole 26 through the jet pipe 27. The hydrogen and the mixed gas enter the catalytic device 13 together. During the catalytic denitrification process, the hydrogen restores the activity of the catalyst, extends the service life of the catalyst, and improves the denitrification efficiency. In addition, the jet pipe 27 blows the hydrogen at an oblique angle to the mixed gas flowing through the jet hole 26. The flow rate of the hydrogen does not hinder the mixed gas from passing through the jet hole 26. The injection of hydrogen slightly changes the vertical flow direction of the mixed gas. When the mixed gas flows inside the jet hole 26, the mixed gas carrying impurities collides with the inner wall of the jet hole 26. The inertial force of the impurities separates them from the mixed gas. The impurities adhere to the inner wall of the jet hole 26, while the mixed gas continues to flow. With the help of the fan and the pad plate 22, large particles of impurities are separated in advance, improving the filtration efficiency of impurities in the mixed gas, reducing the risk of catalyst blockage, and improving the denitrification efficiency.

[0050] When the mixed gas just enters the jet hole 26, the part of the rotating shaft 29 close to the top is in the shape of a small radius cylinder, which does not hinder the mixed gas from colliding with the inner wall of the jet hole 26. After the mixed gas collides with the inner wall of the jet hole 26, it continues to flow to the flat part of the lower part of the rotating shaft 29. The guide ring 19 drives the transmission plate 31 to rotate, and the transmission plate 31 is connected with the top of the transmission shaft 3 through close contact or meshing, so that the transmission plate 31 drives the transmission shaft 3 to rotate. The rotating shaft drives the rotating shaft 29 to rotate through the meshing of the two bevel gears. The rotating of the flat part of the rotating shaft 29 drives the mixed gas passing through it to rotate, and the mixed gas rotating through the centrifugal effect throws the small impurities carried by the mixed gas to the inner wall of the jet hole 26, further improves the filtering efficiency of the impurities in the mixed gas, reduces the risk of the catalyst being blocked, and improves the denitration efficiency. In addition, the mixed gas and hydrogen gas are stirred, so that the mixed gas and hydrogen gas are mixed more uniformly, which helps the hydrogen gas to enter the inside of the catalytic device 13 more uniformly, and helps to restore the activity of the catalysts in the whole catalytic device 13.

[0051] When the hydrogen gas is sprayed to guide the flow of the mixed gas, the distance is circular, the distance on the two sides of the transverse through the center is longer, and the distance on the two sides of the transverse not passing through the center is closer, that is, close to the upper and lower parts of the circle. Therefore, the hydrogen gas needs to be sprayed with a larger power in the center, and a smaller power on the two sides. If the hydrogen gas spraying power is increased to meet the power required in the center, it is easy to affect the flow of the mixed gas. If the hydrogen gas spraying power is reduced, although it can meet the power on the two sides, it is easy to cause the mixed gas in the center to have no guiding effect, which affects the overall effect of separating impurities. Therefore, by arranging the diffusion nozzle 32, when the hydrogen gas passes through the conical part in the middle of the diffusion nozzle 32, the hydrogen gas flowing in the middle is affected by the narrow tube effect, and the hydrogen gas flowing on the two sides is in the normal flow power. Through such cooperation, the sprayed hydrogen gas can more uniformly guide the mixed gas passing through it, push the mixed gas to the inner wall surface of one side of the jet hole 26, improve the impurity separation efficiency, reduce the risk of the catalytic device 13 being blocked, and improve the denitration efficiency.

[0052] In addition, workers can also divide the jet pipe 27 into three branches, one of which is the middle branch and the other two are the side branches, which correspond to the above-mentioned middle part and two side parts. Then, flow valves are arranged on the parts of the three branches located outside the tower body 1 to control the flow of the branches, thereby meeting the above-mentioned needs.

[0053] Example Three

[0054] On the basis of example two, the rotating shaft 29 is provided with a scraper 33 which contacts the inner wall of the jet hole 26. The jet plate 25 is provided with a heating assembly 34, and the jet hole 26 is provided with an annular collection groove 35.

[0055] The scraper 33 is distributed near the top and bottom of the rotating shaft 29, and a pull rope 36 is arranged between adjacent scrapers 33, which contacts the inner wall of the air jet hole 26.

[0056] Specific working process: the rotating shaft 29 drives the scraper 33 to rotate, the scraper 33 scrapes the inner wall of the air jet hole 26 to reduce the adhesion of impurities, the impurities are affected by the centrifugal force of the airflow and the gravity, and drop close to the inner wall of the air jet hole 26 until they enter the collection tank 35; the worker starts the conventional heating assembly 34 in the air jet plate 25, heats the mixed gas passing through the air jet plate 25, avoids the temperature reduction in the flow process, ensures the temperature of the mixed gas entering the catalytic device 13, and ensures the denitration treatment effect; and, part of the impurities, such as ammonium salt, which are thrown on the inner wall of the air jet hole 26, melt into the collection tank 35 by using the characteristic that ammonium salt is in viscous liquid state at more than 230℃, improving the impurity collection effect, thereby improving the filtering effect of impurities in the mixed gas, and avoiding the increase of the influence of the flow caused by the mutual adhesion of new and old impurities;

[0057] The rotating scraper 33 drives the pull rope 36 in a state of being tightly stretched to rotate, the pull rope 36 scrapes the impurities close to the inner wall of the air jet hole 26, and the impurities drop or flow into the collection tank 35; and, when the pull rope 36 rotates through the air jet pipe 27, the hydrogen gas jetted out of the air jet pipe 27 also has the effect of blowing the clean pull rope 36, which, combined with the small surface of the pull rope 36, causes the impurities not to be easily adhered to the pull rope 36, improving the cleaning efficiency; moreover, when the pull rope 36 rotates through the air jet pipe 27, the pull rope 36 will not block or shield the air jet pipe 27, avoiding the influence or interruption of the air jet; in addition, the collection tank 35 is connected to the observation window 24, and the types of collected impurities and cleaning can be directly observed through the observation window 24.

[0058] Example Four:

[0059] On the basis of example three, the top inner wall of the ash removal box 14 is provided with an ash removal piece 37, and the bottom of the ash removal piece 37 contacts one side of the scraper 18, and the bottom of the ash removal piece 37 is located above the fan blade 16;

[0060] The top of the backing plate 22 is uniformly provided with a baffle 38, and the baffle 38 is arranged along the edge of the hole on the backing plate 22, and the side wall of the baffle 38 and the top of the backing plate 22 form a groove, and part of the baffles 38 are located below the ash removal piece 37, and the baffles 38 located below the ash removal piece 37 are linearly directed to the center of the backing plate 22;

[0061] The top of the baffle 38 is uniformly provided with a combing groove 39, and the cleaning brush extends into the combing groove 39.

[0062] Specific workflow: the part of the base plate 22 below the dust removal piece 37 is not provided with a hole, and the catalytic device 13 is also not provided with a hole for the gas flow to pass through, the impurities scraped off by the scraper 18 fall on the surface of the part of the base plate 22, so that the collected impurities cannot enter the catalytic device 13 through the hole; after the scraper 18 scrapes the surface of the fan blade 16, the guide ring 19 guides the scraper 18 to rise, and the dust removal piece 37 scrapes the impurities attached during the rising process of the scraper 18, so that the impurities collected or adhered on the scraper 18 are scraped off, and the impurities fall on the base plate 22 for the worker to observe through the observation window 24, so that the impurity removal efficiency is improved, the impurities are collected and gathered, the comparison between the impurities in the collecting groove 35 and the impurities on the base plate 22 helps the worker to judge and provide adjustment basis; in addition, the dust removal piece 37 is subjected to anti-sticking treatment in advance, so that the impurities are prevented from adhering to the dust removal piece 37.

[0063] Further, during the cleaning process, the brush wire 23 may carry a small amount of impurities to move and contact the hole and the catalytic device 13, when the brush wire 23 approaches the hole, the brush wire 23 first contacts the baffle 38, the baffle 38 passes through the carding groove 39 to straighten the brush wire 23 on one hand, so that the brush wire 23 is prevented from being bent to carry impurities, and on the other hand, the impurities carried in the brush wire 23 are carded out and intercepted on the base plate 22, so that the impurities entering the catalytic device 13 are reduced, and the denitration efficiency is improved.

[0064] In addition, since one part of the baffle 38 is located below the dust removal piece 37, the baffle 38 located below the dust removal piece 37 is in a straight line towards the center of the base plate 22, the brush wire 23 sweeps the impurities to the angle between the baffle 38 located below the dust removal piece 37 and the base plate 22 during multiple brushing processes, so that the impurities are actively collected, the time for gathering the impurities is shortened, the information about the types and quantities of the impurities is provided to the worker in a timely manner, the worker is facilitated to make process adjustment in a timely manner, and the denitration efficiency is improved.

[0065] Example five

[0066] A denitration atomizing lance for a circulating fluidized bed boiler is installed in a tower body 1, and the atomizing lance is contained in a spraying device 12, and the atomizing lance sprays a reducing agent upwards of the tower body 1.

[0067] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A circulating fluidized bed boiler denitration system, comprising a denitration tower, by a tower body (1), a preheating device (11), a spraying device (12) and a catalytic device (13); characterized in that, Also include: The ash box (14) is installed in the tower body (1) above the catalytic device (13), and the top of the ash box (14) is uniformly provided with a ventilation groove (15), which is uniformly distributed in a ring shape. The inside of the ash box (14) is hollow and has an opening at the bottom; the ash box (14) is rotatably connected with a fan blade (16), and the central axis of the fan blade (16) is connected with a motor (17) installed outside the top of the tower body (1) through a drive shaft; the top inner wall of the ash box (14) is provided with a scraper (18), and the scraper (18) is slidably connected with the ash box (14) through a spring, and the bottom of the scraper (18) contacts the top of the fan blade (16); the outer edge of the fan blade (16) is provided with a guide ring (19), and the guide ring (19) is in a wave shape, and the bottom of the scraper (18) is in contact with the top of the guide ring (19) through a ball bearing; The lifting device (2) is installed on the top of the tower body (1), and the motor (17) is located between the lifting device (2) and the top of the tower body (1), and the lifting end of the lifting device (2) drives the motor (17) to lift; the bottom of the guide ring (19) is provided with a cleaning rod (21), and the top of the catalytic device (13) is provided with a backing plate (22), and a plurality of holes are uniformly arranged on the backing plate (22) and coincide with the holes in the catalytic device (13), and the cleaning rod (21) contacts the backing plate (22) through the brush wire (23), and the backing plate (22) is in an arc shape with high center and low edge; the tower body (1) is provided with an observation window (24) close to the backing plate (22).

2. The denitration system of a circulating fluidized bed boiler according to claim 1, characterized in that: The ash box (14) is provided with a jet plate (25) above, and the edge of the jet plate (25) is connected with the inner wall of the tower body (1), and the jet plate (25) is provided with a jet hole (26) inside, and the jet plate (25) is provided with a jet pipe (27) inside, one end of the jet pipe (27) is communicated with a gas supply device (28) installed on one side of the tower body (1), the other end is located in the inner wall of the jet hole (26) and is communicated with the jet hole (26), and the gas supply device (28) sprays protective gas into the jet hole (26).

3. The denitration system of a circulating fluidized bed boiler according to claim 2, characterized in that: The jet hole (26) is rotatably connected with a rotating shaft (29), and the top of the rotating shaft (29) is in a cylindrical shape, and the lower part is in a flat shape; the bottom of the jet plate (25) is rotatably connected with a transmission shaft (3), the top of the guide ring (19) is provided with a transmission plate (31), and one end of the transmission plate (31) is in contact with the transmission shaft (3), and the other end of the transmission shaft (3) away from the transmission plate (31) is connected with the rotating shaft (29).

4. The denitration system of a circulating fluidized bed boiler according to claim 3, characterized in that: The jet pipe (27) is located on one side of the inner wall of the jet hole (26), and the jet pipe (27) is connected with a diffusion nozzle (32) at one end of the jet hole (26), the diffusion nozzle (32) is inclined, the inner part of the diffusion nozzle (32) is separated into a plurality of jet passage holes with different diameters, the middle part is in a conical shape, and the two side parts are in a cylindrical shape.

5. The denitration system of a circulating fluidized bed boiler according to claim 3, characterized in that: The rotating shaft (29) is provided with a scraper (33), and the scraper (33) contacts the inner wall of the jet hole (26); the jet plate (25) is provided with a heating assembly (34), and the jet hole (26) is provided with an annular collecting groove (35).

6. The denitration system of a circulating fluidized bed boiler according to claim 5, characterized in that: The scraper rods (33) are arranged near the top and bottom of the rotating shaft (29), and a pull rope (36) is arranged between adjacent scraper rods (33), and the pull rope (36) contacts the inner wall of the air injection hole (26).

7. The denitration system of a circulating fluidized bed boiler according to claim 1, characterized in that: The top inner wall of the ash removal box (14) is provided with an ash removal piece (37), the bottom of the ash removal piece (37) contacts one side of the scraper (18), and the bottom of the ash removal piece (37) is located above the fan blade (16).

8. The denitration system of a circulating fluidized bed boiler according to claim 1, characterized in that: The top of the backing plate (22) is uniformly provided with a baffle (38), the baffle (38) is arranged along the edge of the hole on the backing plate (22), the side wall of the baffle (38) and the top of the backing plate (22) form a groove, part of the baffles (38) are located below the ash removal piece (37), and the baffles (38) located below the ash removal piece (37) are linearly arranged towards the center of the backing plate (22).

9. The denitration system of a circulating fluidized bed boiler according to claim 8, characterized in that: The top of the baffle (38) is uniformly provided with a combing groove (39), and the cleaning brush extends into the combing groove (39).

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