Quenching ash removal device for relieving ash blockage of heating surface at tail part of biomass boiler

Abstract

The invention relates to the technical field of flue gas treatment, in particular to a shock cooling ash removal device for relieving ash blockage of a heating surface at the tail of a biomass boiler. Which comprises a conical shell, the top of the conical shell is fixedly connected with an outer barrel, the bottom of the conical shell is fixedly connected and communicated with a material storage shell, the material storage shell is fixedly connected and communicated with a discharging pipe, and is characterized in that the outer barrel is fixedly connected with an inner ring, the inner ring divides the outer barrel into an inner cavity and an outer cavity, the inner ring is fixedly connected with a smoke inlet pipe, and the smoke inlet pipe is fixedly connected with a smoke outlet. The outer cylinder is fixedly connected with an air inlet pipe, the outer cylinder is fixedly connected with an air outlet pipe, and the inner ring is provided with a plurality of air outlet grooves distributed in the circumferential direction. Cold air enters the outer cylinder along the circumferentially distributed air outlet grooves, so that the cold air is circumferentially mixed along with the spiral movement of flue gas, the injection position of the cold air is dispersed, the impact force of the cold air on the flue gas is reduced, the running track of the flue gas is stabilized, and the separation rate of solid particles in the flue gas is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and particularly to a quenching ash removal device for slowing down ash fouling and blockage of the heating surface at the tail of a biomass boiler. Background Technique

[0002] As a key renewable energy source for promoting the realization of the carbon neutrality goal, the efficient utilization of biomass energy faces many technical challenges. Biomass boilers play an important role in this. Biomass boilers generate heat or electricity by burning biomass fuels (such as wood, agricultural waste, etc.). However, in practical applications, biomass boilers are particularly affected by alkali metals and chlorine elements in the fuel. Problems such as corrosion, ash fouling, and catalyst poisoning caused by these components seriously restrict the large-scale application and development of biomass boilers. Among them, gaseous KCl generated during the combustion of biomass fuels is easily condensed on the heating surface when the temperature is below 771 °C, causing corrosion to the heating surface at the tail of the boiler; at the same time, highly viscous fly ash is easily accumulated on the heating surface at the tail, resulting in ash fouling and blockage, reducing the thermal efficiency, increasing the maintenance cost and safety risk.

[0003] To solve the problem of easy ash fouling and blockage of the heating surface at the tail of a biomass boiler, currently, a design with low flue gas temperature and large pitch is generally adopted: by increasing the radiant heating surface of the furnace, the outlet temperature is reduced below the sublimation temperature of KCl (usually below 750 °C) so that KCl sublimates without contacting the heating surface. At the same time, the spacing between heat exchange tubes such as superheaters, economizers, and air preheaters is increased to avoid fly ash sticking and "bridging". However, this method has many deficiencies: increasing the heating surface of the furnace requires more steel, resulting in increased costs; the heating surface at the tail is still prone to ash fouling and requires frequent ash cleaning; increasing the tube spacing will reduce the flue gas flow rate and heat exchange efficiency; increasing the number of tube rows is required during the transformation, further increasing the investment; alkali metals in biomass fly ash are likely to cause SCR catalyst poisoning, affecting the denitrification effect and increasing the replacement cost. Summary of the Invention

[0004] In order to overcome the disadvantages mentioned in the above background technique, the present invention provides a quenching ash removal device for slowing down ash fouling and blockage of the heating surface at the tail of a biomass boiler.

[0005] Technical solution of the present invention: Set the temperature at the furnace outlet of the biomass boiler above the sublimation temperature of KCl, that is, 800 - 850 °C. After the temperature at the furnace outlet is increased, the layout of the radiation heating surface can be reduced, significantly reducing the steel consumption and equipment cost. And a rapid cooling and ash removal device is arranged at the furnace outlet. The rapid cooling and ash removal device is based on a cyclone separator, injecting low-temperature flue gas into it and mixing it with the high-temperature flue gas containing KCl, quickly cooling the flue gas at about 800 °C to below 750 °C, converting KCl from a gaseous state to a solid state, and discharging large particle fly ash and solidified KCl by means of the centrifugal action of the cyclone separator, realizing the rapid cooling and ash removal of the flue gas. This method effectively alleviates the ash fouling and blockage problems of the subsequent heating surfaces (such as superheater, economizer, air preheater).

[0006] A rapid cooling and ash removal device for alleviating ash fouling and blockage of the tail heating surface of a biomass boiler, comprising a conical shell. The top of the conical shell is fixedly connected with an outer cylinder. The bottom of the conical shell is fixedly connected and communicated with a storage shell. The storage shell is fixedly connected and communicated with a discharge pipe. Its characteristic is that the outer cylinder is fixedly connected with an inner ring. The inner ring divides the outer cylinder into an inner cavity and an outer cavity. The inner cavity is communicated with the conical shell. The inner ring is fixedly connected with a smoke inlet pipe communicated with the inner cavity. The outer cylinder is fixedly connected with an air inlet pipe communicated with the outer cavity. The outer cylinder is fixedly connected with an air outlet pipe communicated with the conical shell. The inner ring is provided with a number of air outlet grooves distributed circumferentially.

[0007] More preferably, all the air outlet grooves are inclined on the inner ring, and the inclination angles of all the air outlet grooves are the same, for guiding the gas in the outer cavity of the outer cylinder to mix the gas in the inner cavity of the outer cylinder with the gas in the outer cavity.

[0008] More preferably, a shielding shell is slidably connected in the outer cylinder. The shielding shell fits with the inner ring, so that the particles in the outer cylinder adhere to the shielding shell. A number of through grooves are provided on the shielding shell for the gas in the smoke inlet pipe and the air outlet grooves to enter the inner cavity of the outer cylinder. The outer cylinder is provided with a driving component for driving the shielding shell to reciprocate.

[0009] More preferably, the driving component includes a servo motor. The servo motor is fixedly connected to the outer cylinder. The output shaft of the servo motor is fixedly connected with a reciprocating lead screw. The shielding shell is fixedly connected with a pushing frame. The pushing frame is slidably connected with the outer cylinder. The pushing frame is threadedly connected with the reciprocating lead screw.

[0010] More preferably, a plugging assembly is further included. The plugging assembly is arranged in the discharge pipe and used for plugging the discharge pipe. The plugging assembly includes a transmission shaft. The transmission shaft is splined in the air outlet pipe. The transmission shaft is fixedly connected with a plugging disc. The plugging disc is used for plugging the discharge pipe. The outer cylinder is provided with a pushing assembly for driving the transmission shaft to move.

[0011] More preferably, the pushing assembly includes a first gear fixedly connected to the output shaft of the servo motor. A rotating cylinder is hermetically and rotatably connected between the outer cylinder and the air outlet pipe. The rotating cylinder is fixedly connected with a second gear meshing with the first gear. The rotating cylinder is fixedly connected with a transmission cylinder. A sliding groove is arranged in the transmission cylinder. The transmission shaft is fixedly connected with a clamping block which slides in the sliding groove.

[0012] More preferably, the sliding groove is formed by sequentially connecting a first annular groove, a vertical groove, a second annular groove and an inclined groove end to end.

[0013] More preferably, the central angle corresponding to the first annular groove is greater than the sum of the central angles corresponding to the second annular groove and the inclined groove.

[0014] More preferably, the transmission cylinder is fixedly connected with a connecting cylinder. The connecting cylinder is rotatably and slidably connected with the transmission shaft. The connecting cylinder is rotatably connected with a plurality of spreading frames in the storage shell. There is friction between the spreading frames and the connecting cylinder. The spreading frames are used for stirring the materials in the storage shell.

[0015] More preferably, the connecting cylinder is fixedly connected with a material distributing table. The material distributing table is rotatably connected with the transmission shaft. The material distributing table is attached to the plugging disc. The material distributing table is frustum-shaped, and the side wall of the material distributing table is fixedly connected with circumferentially distributed pushing blocks.

[0016] The beneficial effects are as follows: 1. In the present invention, cold air enters the outer cylinder along the circumferentially distributed air outlet grooves, so that the cold air is circumferentially mixed along with the spiral movement of the flue gas, the injection positions of the cold air are dispersed, the impact force of the cold air on the flue gas is reduced, the running track of the flue gas is stabilized, and the separation rate of solid particles in the flue gas is improved.

[0017] 2. By making the shielding shell fit the inner ring and shielding it, impurities adhere to the shielding shell. Without destroying the air outlet direction of the air outlet grooves, the shielding shell reciprocates along the outer cylinder to scrape the impurities on the outer wall of the shielding shell, ensuring the smoothness of the outer wall of the shielding shell and improving the stability of the running track of the flue gas.

[0018] 3. Regularly relieve the blockage of the discharge pipe through the blocking disc, so that the solid particles in the storage shell are regularly discharged outward, enabling the double blockage of the outer cylinder by the accumulation of solid particles and the blocking disc, reducing the probability of gas leakage in the conical shell and causing heat loss.

[0019] 4. Level the solid particles in the storage shell through the leveling frame, so that the solid particles are evenly laid in the storage shell, improving the sealing strength of the particle layer for the gas in the conical shell. The material distribution table drives the pushing block to rotate, thereby pushing the solid particles, reducing the probability of the solid particles getting stuck, and ensuring that the solid particles can be smoothly discharged to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a three-dimensional structural sectional view of the conical shell and the outer cylinder of the present invention; Figure 3 is a three-dimensional structural schematic diagram of the servo motor and the reciprocating lead screw of the present invention; Figure 4 is a three-dimensional structural schematic diagram of the pushing frame of the present invention; Figure 5 is a three-dimensional structural schematic diagram of the inner ring and the shielding shell of the present invention; Figure 6 is a three-dimensional structural schematic diagram of the second gear and the transmission cylinder of the present invention; Figure 7 is a three-dimensional structural sectional view of the storage shell and the discharge pipe of the present invention; Figure 8 is a three-dimensional structural schematic diagram of the sliding groove and the clamping block of the present invention; Figure 9 is a three-dimensional structural sectional view of the transmission cylinder of the present invention; Figure 10 is a three-dimensional structural schematic diagram of the material distribution table and the pushing block of the present invention.

[0021] The reference signs in the drawings are as follows: 1 - conical shell, 2 - outer cylinder, 3 - storage shell, 4 - discharge pipe, 5 - inner ring, 6 - smoke inlet pipe, 7 - air inlet pipe, 8 - air outlet pipe, 9 - air outlet groove, 201 - shielding shell, 202 - servo motor, 203 - reciprocating lead screw, 204 - pushing frame, 301 - transmission shaft, 302 - blocking disc, 303 - first gear, 304 - rotating cylinder, 305 - second gear, 306 - transmission cylinder, 307 - sliding groove, 308 - clamping block, 3071 - first annular groove, 3072 - vertical groove, 3073 - second annular groove, 3074 - inclined groove, 401 - connecting cylinder, 402 - leveling frame, 403 - material distribution table, 404 - pushing block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0023] In this solution, the temperature at the outlet of the biomass boiler furnace is set above the KCl sublimation temperature, that is, 800 - 850 °C. After the temperature at the furnace outlet is increased, the layout of the radiation heating surface can be reduced, significantly reducing the steel consumption and equipment cost. A rapid cooling and ash removal device is provided at the furnace outlet. The rapid cooling and ash removal device is based on a cyclone separator, injecting low-temperature flue gas into it and mixing it with the high-temperature flue gas containing KCl, quickly cooling the flue gas at about 800 °C to below 750 °C, converting KCl from a gaseous state to a solid state, and discharging large particle fly ash and solidified KCl by means of the centrifugal action of the cyclone separator, realizing the rapid cooling and ash removal of the flue gas. This method effectively alleviates the ash fouling and blockage problems of subsequent heating surfaces (such as superheaters, economizers, air preheaters).

[0024] However, the existing gas injection method usually injects low-temperature gas into the cyclone separator centrally, resulting in too concentrated an impact on the high-temperature flue gas, making the flow trajectory of the high-temperature flue gas disordered, not only affecting the centrifugal separation effect of fly ash and solidified KCl, but also hindering the uniform mixing of low-temperature gas and high-temperature flue gas.

[0025] Embodiment 1 This embodiment discloses a rapid cooling and ash removal device for alleviating ash fouling and blockage of the tail heating surface of a biomass boiler, which is used to pre-separate impurities such as potassium chloride in the flue gas.

[0026] A rapid cooling and ash removal device for alleviating ash fouling and blockage of the tail heating surface of a biomass boiler, as Figures 1-5As shown in the figure, this device is installed at the furnace outlet of the boiler, and devices such as the superheater are moved backward. It includes a conical shell 1. The top of the conical shell 1 is fixedly connected to an outer cylinder 2. The bottom of the conical shell 1 is fixedly connected and communicated with a storage shell 3. The storage shell 3 is used to store the separated solid particle materials. The storage shell 3 is fixedly connected and communicated with a discharge pipe 4. A feeding component, such as a screw conveyor, is arranged in the discharge pipe 4 to convey the materials in the discharge pipe 4 outward. A heat exchanger can also be arranged outside the discharge pipe 4 to reduce the temperature of the 700°C solid particles (the general term for solid impurities such as potassium chloride, which will be described in the following text in the same way) to 100°C, and absorb the heat of the solid particles for heat output at other positions, so as to achieve the effect of energy saving. An inner ring 5 is fixedly connected inside the outer cylinder 2. The inner ring 5 divides the outer cylinder 2 into an inner cavity and an outer cavity. The inner cavity is communicated with the conical shell 1. The inner ring 5 is fixedly connected with a smoke inlet pipe 6 communicated with the inner cavity. The smoke inlet pipe 6 is communicated with the external furnace (the flue gas temperature in the furnace is controlled between 800°C and 850°C, and potassium chloride will not sublime in this temperature range). And the smoke inlet direction of the smoke inlet pipe 6 is the same as the tangential direction of the inner ring 5, so that the flue gas forms a spiral downward air flow in the conical shell 1 and the outer cylinder 2, and separates the impurities in the flue gas by centrifugal force (the same principle as a cyclone separator). An air inlet pipe 7 communicated with the outer cavity is fixedly connected to the outer wall of the outer cylinder 2. The air inlet pipe 7 is used to inject low-temperature gas or low-temperature flue gas (lower than 350°C) into the outer cylinder 2. An air outlet pipe 8 communicated with the conical shell 1 is fixedly connected through the upper part of the outer cylinder 2. The air outlet pipe 8 is used to discharge the purified gas. The inner ring 5 is provided with a number of air outlet grooves 9 distributed circumferentially. All the air outlet grooves 9 are equally spaced on the inner ring 5. The air outlet grooves 9 communicate the inner cavity and the outer cavity. All the air outlet grooves 9 are inclined on the inner ring 5, and all the inclination angles of the air outlet grooves 9 are the same, and the inclination direction is towards the flowing direction of the high-temperature flue gas, which is used to guide the gas in the outer cavity of the outer cylinder 2, so that the gas in the inner cavity of the outer cylinder 2 is mixed with the gas in the outer cavity, and the air flow form of the high-temperature flue gas is stabilized.

[0027] The above settings can achieve that the furnace flue gas enters the inner cavity of the outer cylinder 2 through the smoke inlet pipe 6 and flows spirally downward along the inner ring 5. At the same time, the external cold air enters the outer cavity of the outer cylinder 2 through the air inlet pipe 7 and flows into the inner cavity through the circumferentially arranged air outlet grooves 9, and mixes along the flowing direction of the flue gas without disturbing the moving track of the flue gas. The hot and cold gases exchange heat during the spiral movement, so that the temperature of the flue gas drops, potassium chloride precipitates, and adheres to the outer wall of the conical shell 1 under the action of centrifugal force and slides down to the storage shell 3.

[0028] As Figures 2-5As shown, a shielding shell 201 is slidably connected inside the outer cylinder 2. The shielding shell 201 is in contact with the inner ring 5, so that the particles inside the outer cylinder 2 adhere to the shielding shell 201. A number of through grooves are provided on the shielding shell 201 for allowing the gas in the smoke inlet pipe 6 and the air outlet groove 9 to enter the inner cavity of the outer cylinder 2. And the length of the through groove is greater than the length of the air outlet groove 9 and the height of the smoke inlet pipe 6, so that when the shielding shell 201 slides, it will not block the smoke inlet pipe 6 and the air outlet groove 9 and affect the movement of the air flow. The outer cylinder 2 is provided with a driving component for driving the shielding shell 201 to reciprocate. The driving component includes a servo motor 202. The servo motor 202 is fixedly connected to the top of the outer cylinder 2. The output shaft of the servo motor 202 is fixedly connected with a reciprocating lead screw 203. The shielding shell 201 is fixedly connected with a pushing frame 204. The bottom of the reciprocating lead screw 203 is higher than the top of the outer cylinder 2. The pushing frame 204 is slidably connected with the outer cylinder 2. The pushing frame 204 is threadedly connected with the reciprocating lead screw 203. The reciprocating lead screw 203 is used to drive the shielding shell 201 to reciprocate through the pushing frame 204.

[0029] The above settings can achieve that solid particles adhere to the shielding shell 201. The output shaft of the servo motor 202 drives the reciprocating lead screw 203 to rotate, and the shielding shell 201 reciprocates up and down through the pushing frame 204. In this process, not only does the shielding shell 201 slide along the outer cylinder 2, but the outer cylinder 2 is also used to scrape off the impurities attached to it, so that the impurities fall off and fall into the storage shell 3 along the conical shell 1 and the outer cylinder 2, keeping the outer wall of the shielding shell 201 smooth.

[0030] This device is located at the furnace outlet, connecting the furnace with the flue gas inlet pipe 6, and the outlet pipe 8 is connected to the subsequent heat receiving surfaces (such as superheater, economizer, air preheater). The flue gas in the furnace enters the inner cavity of the outer cylinder 2 through the flue gas inlet pipe 6. The flue gas adheres to the shielding shell 201 to form a spiral downward trajectory. At the same time, the external cold air enters the outer cavity of the outer cylinder 2 through the air inlet pipe 7 and enters the inner cavity of the outer cylinder 2 along the circumferentially distributed air outlet grooves 9 and the through grooves on the shielding shell 201. At this time, the flow direction of the cold air conforms to the flow direction of the flue gas, and the two are mixed with each other. Moreover, the original spiral downward movement trend of the flue gas is not impacted and disordered. After the cold air and the flue gas are mixed, heat transfer occurs between the cold air and the flue gas, and the temperature of the flue gas drops, causing potassium chloride in the flue gas to precipitate. The solid particles contact the outer wall of the conical shell 1 under the centrifugal force of the spiral movement of the flue gas and move downward along the outer wall of the conical shell 1. In this way, until the solid particles enter the storage shell 3 along the conical shell 1. At the same time, after the flue gas moves to the bottom of the conical shell 1, a spiral upward air flow is formed, and the purified flue gas is discharged along the outlet pipe 8. By making the cold air enter the outer cylinder 2 through the circumferentially distributed air outlet grooves 9, the cold air is circumferentially mixed in accordance with the spiral movement of the flue gas, reducing the impact force of the cold air on the flue gas, stabilizing the running trajectory of the flue gas, and improving the separation rate of solid particles in the flue gas. The solid particles enter the discharge pipe 4 through the storage shell 3 and accumulate inside. In this way, until a certain amount of solid particles are accumulated in the storage shell 3 to form a material blocking layer of solid particles (the content of solid particles in the storage shell 3 can be freely changed, provided that the gas in the conical shell 1 does not leak). Then, the feeding component in the discharge pipe 4 is started to discharge the solid particles from the discharge pipe 4.

[0031] After the cold air and the flue gas are mixed in the outer cylinder 2, the newly precipitated potassium chloride and impurities in the flue gas are extremely likely to adhere to the inner wall of the outer cylinder 2. After long-term use, the solid particles on the outer cylinder 2 gradually accumulate, which may block the discharge of the cold air in the air outlet groove 9. In this application, the shielding shell 201 is completely attached to the inner wall of the inner ring 5, so that the solid particles adhere to the shielding shell 201. And when injecting cold air into the air inlet pipe 7, the servo motor 202 is started synchronously. The output shaft of the servo motor 202 drives the reciprocating lead screw 203 to rotate, so that the reciprocating lead screw 203 drives the shielding shell 201 to move up and down reciprocally through the pushing frame 204. The shielding shell 201 reciprocates along the outer cylinder 2, and the impurities attached to the shielding shell 201 move synchronously with the shielding shell 201. During this process, the shielding shell 201 will slide into the outer cylinder 2, so that the outer cylinder 2 scrapes the impurities attached to the shielding shell 201, separating the impurities from the shielding shell 201, and moving along the conical shell 1 and the outer cylinder 2, and finally entering the storage shell 3, ensuring the smoothness of the outer wall of the shielding shell 201 and improving the stability of the flue gas movement trajectory. In this way, until the treatment of the flue gas is stopped, the injection of cold air into the air inlet pipe 7 is stopped, and at the same time, the servo motor 202 is turned off.

[0032] Embodiment 2 This embodiment discloses a quenching ash removal device for reducing ash fouling and blockage in the tail heating surface of a biomass boiler, which is further improved on the basis of Embodiment 1.

[0033] As Figure 3 , Figure 6 , Figure 7 and Figure 10 shown, it further includes a blocking assembly. The blocking assembly is arranged in the discharge pipe 4 and is used to block the discharge pipe 4. The blocking assembly includes a transmission shaft 301. The transmission shaft 301 is splined to the bottom inside the air outlet pipe 8. The transmission shaft 301 is located inside the conical shell 1 and the outer cylinder 2. A blocking disc 302 is fixedly connected to the bottom of the transmission shaft 301. The blocking disc 302 is used to block the discharge pipe 4. In the initial state, the blocking disc 302 is in contact with the discharge pipe 4, and the discharge pipe 4 is in a blocked state. The outer cylinder 2 is provided with a pushing assembly for driving the movement of the transmission shaft 301.

[0034] The above settings can achieve that the blocking disc 302 blocks the discharge pipe 4, so that the separated solid particles are first stored in the storage shell 3, and the solid particles accumulate in the storage shell 3 to form a blocking layer to prevent the gas in the conical shell 1 from leaking to the outside.

[0035] As Figure 3 and Figures 6-9As shown in the figure, the pushing component includes a first gear 303. The first gear 303 is fixedly connected to the output shaft of the servo motor 202. There is a rotatable cylinder 304 sealed between the outer cylinder 2 and the air outlet pipe 8. A second gear 305 meshing with the first gear 303 is fixedly connected to the top of the rotatable cylinder 304. A transmission cylinder 306 is fixedly connected to the bottom of the rotatable cylinder 304. The axis of rotation of the rotatable cylinder 304 coincides with the central axis of the transmission cylinder 306, which is used to drive the transmission cylinder 306 to rotate coaxially by the rotatable cylinder 304. A chute 307 is arranged in the transmission cylinder 306. A clamping block 308 is fixedly connected to the transmission shaft 301. The clamping block 308 slides in the chute 307. The chute 307 is sequentially connected by a first annular groove 3071, a vertical groove 3072, a second annular groove 3073, and an inclined groove 3074. The first annular groove 3071 is located in the upper part of the chute 307. The vertical groove 3072 and the inclined groove 3074 are located in the middle part of the chute 307. The second annular groove 3073 is located in the lower part of the chute 307. The vertical groove 3072 is used to quickly release the blockage of the discharge pipe 4 by the blocking plate 302. When the clamping block 308 is located in the first annular groove 3071, the blocking plate 302 blocks the discharge pipe 4. When the clamping block 308 is located in the second annular groove 3073, the discharge pipe 4 is in an open state. When the clamping block 308 is located in the inclined groove 3074, the discharge pipe 4 is in an intermediate state from open to blocked. In the initial state, the clamping block 308 is located in the first annular groove 3071. The central angle corresponding to the first annular groove 3071 is greater than the sum of the central angles corresponding to the second annular groove 3073 and the inclined groove 3074, so that the discharge pipe 4 is blocked for a long time, and the accumulated solid particles are discharged in a short time, prolonging the blocking time of the blocking plate 302 on the discharge pipe 4 and reducing the probability of gas leakage in the conical shell 1.

[0036] The above settings can be realized. Starting from the clamping block 308 being located in the first annular groove 3071, the clamping block 308 slides from the first annular groove 3071 into the vertical groove 3072. The clamping block 308 slides along the vertical groove 3072. At this time, the blocking plate 302 quickly slides downward to release the blockage of the discharge pipe 4. Then the clamping block 308 slides along the second annular groove 3073. At this time, the discharge pipe 4 is in an open state. The solid particles in the storage shell 3 start to enter the discharge pipe 4 and are discharged outward. When the clamping block 308 slides into the inclined groove 3074, the blocking plate 302 moves upward until the clamping block 308 enters the first annular groove 3071 again. At this time, the blocking plate 302 blocks the discharge pipe 4. In this way, the cycle is repeated to make the blocking plate 302 intermittently release the blockage of the discharge pipe 4.

[0037] As Figure 8 and Figure 10As shown in the figure, a connecting cylinder 401 is fixedly connected to the bottom of the transmission cylinder 306. The central axis of the connecting cylinder 401 coincides with the central axis of the transmission cylinder 306. The connecting cylinder 401 is rotationally and slidably connected to the transmission shaft 301. A plurality of flattening frames 402 are rotatably connected to the connecting cylinder 401 within the storage shell 3. There is friction between the flattening frame 402 and the connecting cylinder 401. When the resistance received by the flattening frame 402 is less than the friction with the connecting cylinder 401, the connecting cylinder 401 can drive the flattening frame 402 to rotate synchronously. When the resistance received by the flattening frame 402 is greater than the friction with the connecting cylinder 401, the connecting cylinder 401 cannot drive the flattening frame 402 to rotate synchronously. The connecting cylinder 401 is fixedly connected to a material distributing table 403. The material distributing table 403 is rotationally connected to the transmission shaft 301. The material distributing table 403 is in contact with the blocking disc 302. The material distributing table 403 is frustum-shaped, facilitating the downward movement of the solid particles within the storage shell 3. Moreover, the side wall of the material distributing table 403 is fixedly connected with circumferentially distributed pushing blocks 404, and the pushing blocks 404 push the material downward, reducing the probability of the solid particles getting stuck.

[0038] The above settings can achieve that the transmission cylinder 306 drives a plurality of flattening frames 402 to rotate synchronously through the connecting cylinder 401. The flattening frames 402 buried by the solid particles are blocked and cannot rotate, while the unburied parts push the solid particles within the storage shell 3 to spread them evenly. At the same time, the connecting cylinder 401 drives the material distributing table 403 to rotate synchronously. When the blocking disc 302 releases the blockage of the discharge pipe 4, the multiple pushing blocks 404 on the material distributing table 403 rotate accordingly and push the solid particles.

[0039] During the rotation of the output shaft of the servo motor 202 driving the reciprocating lead screw 203, the output shaft of the servo motor 202 drives the rotating cylinder 304 to rotate through the first gear 303 and the second gear 305, enabling the rotating cylinder 304 to drive the transmission cylinder 306 to rotate. The transmission cylinder 306 drives the internal sliding groove 307 to rotate synchronously, causing the sliding groove 307 to squeeze the clamping block 308. The clamping block 308 drives the transmission shaft 301 to move intermittently and reciprocally along the air outlet pipe 8. Initially, the blocking disc 302 blocks the discharge pipe 4, and the solid particles located within the storage shell 3 cannot enter the discharge pipe 4. When the transmission shaft 301 drives the blocking disc 302 to move downward, the blocking disc 302 releases the blockage of the discharge pipe 4, enabling the solid particles within the storage shell 3 to enter the discharge pipe 4 downward and be discharged to the outside along the discharge pipe 4. By periodically releasing the blockage of the discharge pipe 4 by the blocking disc 302, the solid particles within the storage shell 3 are regularly discharged to the outside. Through the dual blockages of the solid particle accumulation and the blocking disc 302, the probability of gas leakage within the conical shell 1 is reduced.

[0040] During the rotation of the rotary drum 304 driving the transmission drum 306, the transmission drum 306 drives a number of flattening frames 402 arranged in a straight line array thereon to rotate synchronously through the connecting cylinder 401. The flattening frames 402 buried by solid particles cannot rotate, and the flattening frames 402 not buried by solid particles rotate under the drive of the connecting cylinder 401, and push the solid particles in the storage shell 3, so that the solid particles are evenly laid in the storage shell 3, improving the sealing strength of the particle layer for the gas in the conical shell 1. When the connecting cylinder 401 rotates, it synchronously drives the material distributing table 403 to rotate. That is, when the blocking plate 302 releases the blockage of the discharge pipe 4, the material distributing table 403 drives the pushing blocks 404 distributed at equal circumferential intervals thereon to rotate, and the pushing blocks 404 push the solid particles to move along the discharge pipe 4, reducing the probability of the solid particles getting stuck and ensuring that the solid particles can be smoothly discharged to the outside. Thus, until the treatment of the flue gas stops, at this time, the servo motor 202 controls the blocking plate 302 to block the discharge pipe 4, and then the servo motor 202 is turned off. When the flue gas needs to be treated again, the above steps are repeated.

[0041] The above is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler, comprising a conical shell (1), the top of the conical shell (1) is fixedly connected with an outer cylinder (2), the bottom of the conical shell (1) is fixedly connected and communicated with a storage shell (3), the storage shell (3) is fixedly connected and communicated with a discharge pipe (4), and the feature is that, The outer cylinder (2) is fixedly connected with an inner ring (5). The inner ring (5) divides the outer cylinder (2) into an inner cavity and an outer cavity. The inner cavity communicates with the conical shell (1). The inner ring (5) is fixedly connected with a smoke inlet pipe (6) communicating with the inner cavity. The outer cylinder (2) is fixedly connected with an air inlet pipe (7) communicating with the outer cavity. The outer cylinder (2) is fixedly connected with an air outlet pipe (8) communicating with the conical shell (1). The inner ring (5) is provided with a plurality of air outlet grooves (9) distributed circumferentially.

2. The quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler according to claim 1, wherein All the air outlet grooves (9) are inclinedly distributed on the inner ring (5), and all the inclination angles of the air outlet grooves (9) are the same, which are used to guide the gas in the outer cavity of the outer cylinder (2) so that the gas in the inner cavity of the outer cylinder (2) is mixed with the gas in the outer cavity.

3. The quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler according to claim 2, wherein A shielding shell (201) is slidably connected in the outer cylinder (2). The shielding shell (201) is attached to the inner ring (5) so that the particles in the outer cylinder (2) adhere to the shielding shell (201). A plurality of through grooves are provided on the shielding shell (201) for the gas in the smoke inlet pipe (6) and the air outlet grooves (9) to enter the inner cavity of the outer cylinder (2). The outer cylinder (2) is provided with a driving assembly for driving the shielding shell (201) to reciprocate.

4. A quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler according to claim 3, characterized in that, The driving assembly includes a servo motor (202). The servo motor (202) is fixedly connected to the outer cylinder (2). The output shaft of the servo motor (202) is fixedly connected with a reciprocating lead screw (203). The shielding shell (201) is fixedly connected with a pushing frame (204). The pushing frame (204) is slidably connected to the outer cylinder (2). The pushing frame (204) is threadedly connected to the reciprocating lead screw (203).

5. A quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler according to claim 4, characterized in that, It further includes a blocking assembly. The blocking assembly is arranged in the discharge pipe (4) for blocking the discharge pipe (4). The blocking assembly includes a transmission shaft (301). The transmission shaft (301) is splined in the air outlet pipe (8). The transmission shaft (301) is fixedly connected with a blocking disc (302). The blocking disc (302) is used to block the discharge pipe (4). The outer cylinder (2) is provided with a pushing assembly for driving the transmission shaft (301) to move.

6. A quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler according to claim 5, characterized in that, The pushing assembly includes a first gear (303). The first gear (303) is fixedly connected to the output shaft of the servo motor (202). A rotating cylinder (304) is hermetically and rotatably connected between the outer cylinder (2) and the air outlet pipe (8). The rotating cylinder (304) is fixedly connected with a second gear (305) meshing with the first gear (303). The rotating cylinder (304) is fixedly connected with a transmission cylinder (306). A chute (307) is arranged in the transmission cylinder (306). The transmission shaft (301) is fixedly connected with a clamping block (308). The clamping block (308) slides in the chute (307).

7. A quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler according to claim 6, characterized in that, The chute (307) is composed of a first annular groove (3071), a vertical groove (3072), a second annular groove (3073) and an inclined groove (3074) connected end to end in sequence.

8. A quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler according to claim 7, characterized in that, The central angle corresponding to the first annular groove (3071) is greater than the sum of the central angles corresponding to the second annular groove (3073) and the inclined groove (3074).

9. A quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler according to claim 8, characterized in that, A connecting cylinder (401) is fixedly connected to the transmission cylinder (306). The connecting cylinder (401) is rotationally and slidably connected to the transmission shaft (301). A plurality of flattening frames (402) are rotationally connected to the connecting cylinder (401) inside the material storage shell (3). There is friction between the flattening frame (402) and the connecting cylinder (401), and the flattening frame (402) is used for agitating the material inside the material storage shell (3).

10. A quenching ash removal device for reducing ash fouling and blockage of the tail heating surface of a biomass boiler according to claim 9, characterized in that, The connecting cylinder (401) is fixedly connected to a material distribution table (403). The material distribution table (403) is rotationally connected to the transmission shaft (301). The material distribution table (403) is in contact with the plugging disc (302). The material distribution table (403) is frustum-shaped, and the side wall of the material distribution table (403) is fixedly connected with circumferentially distributed pushing blocks (404).

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