A flue gas SCR denitration device for the cement kiln tail system

Abstract

This application relates to the technical field of flue gas denitrification, and discloses a SCR denitrification device for the flue gas of a cement kiln tail system. In order to solve the problem of uneven mixing of flue gas and ammonia water, a mixing pipe is arranged in the flue gas channel. When the mixed state of ammonia water and flue gas enters the mixing pipe, the closed mixing pipe prolongs the mixing time of ammonia water and flue gas. At the same time, a driving motor is used to drive a stirring rod to continuously rotate in the mixing pipe, further enhancing the mixing between ammonia water and flue gas. When a certain mixing time is reached, it is evenly sprayed out from the mixed flow filter plate. Therefore, through the combined cooperation of multiple methods such as prolonging the mixing time, enhancing the stirring intensity, and evenly spraying the mixture, this application achieves the effect of uniform mixing of ammonia water and flue gas.

Description

Technical Field

[0001] This application relates to the technical field of flue gas denitrification, and particularly to a SCR denitrification device for the flue gas of a cement kiln tail system. Background Art

[0002] SCR denitrification of the cement kiln tail is a flue gas denitrification technology applied in the cement production process. SCR, namely Selective Catalytic Reduction, is to make a reducing agent (such as ammonia water or urea) react chemically with nitrogen oxides (NOx) in the flue gas under the action of a catalyst to generate harmless nitrogen and water, so as to achieve the purpose of reducing NOx emissions.

[0003] In the process of SCR denitrification of the cement kiln tail, first, ammonia water or urea is introduced into the system as a reducing agent. After dilution and atomization, it is sprayed into the appropriate temperature area at the tail of the cement kiln. Then, under the action of the catalyst, the reducing agent and NOx in the flue gas carry out a selective catalytic reduction reaction to convert NOx into harmless N2 and H2O.

[0004] However, in the current application of SCR technology, since ammonia water and flue gas are directly mixed in the pipeline, this direct mixing method makes the contact time between ammonia water and flue gas relatively short. As the flue gas flows rapidly and directly into the catalyst, the mixing process of ammonia water and flue gas is often insufficient. Due to the short mixing time, ammonia water fails to be evenly distributed in the flue gas, resulting in uneven mixing. This uneven mixing not only affects the denitrification efficiency of the SCR system but also may increase the risk of ammonia escape and have a negative impact on the activity of the catalyst. Summary of the Invention

[0005] This application proposes a SCR denitrification device for the flue gas of a cement kiln tail system, and its design advantage is that it can achieve uniform mixing between ammonia water and flue gas, thus effectively solving the problem of uneven mixing of flue gas and ammonia water mentioned in the background art.

[0006] To achieve the above purpose, this application adopts the following technical solution: A SCR denitrification device for the flue gas of a cement kiln tail system includes: a support base, on the surface of which a reactor equipped with catalyst plates is fixedly connected; a mixing pipe, which communicates with the reactor through a connecting pipe, and a shunt pipe is fixed on the outside, and a dust collector is fixedly connected to the top of the shunt pipe, and the dust collector is connected to a fan through an air delivery pipe; an ammonia liquid input pipe, fixedly connected to the side of the connecting pipe, and an inner flow pipe located in the inner cavity of the mixing pipe is movably installed inside, and the ammonia liquid input pipe is communicated with an ammonia delivery pump; a mixing filter plate, movably installed at both ends of the mixing pipe respectively, and through holes are formed on the surface; a driving motor, fixedly installed inside the connecting pipe, and a transmission rod fixed to the output shaft is connected to a sectional piston sleeved in the inner cavity of the mixing pipe; a stirring rod, movably installed on the sectional piston.

[0007] Further, it further includes: connecting heads respectively fixed at both ends of the stirring rod; a limiting retaining ring fixed on the side of the stirring rod; an air flow reversing seat fixed on the outside of the mixing pipe, with a reversing baffle movably installed inside, and two reversing holes are opened on the reversing baffle; a reversing rod fixed at the bottom of the reversing baffle and located inside the mixing pipe; a restoring column movably installed on the outer side of the middle part of the breaking piston; and bevels are provided on the inner sides at both ends of the mixing pipe.

[0008] Further, the end of the liquid delivery pipe located inside the mixing pipe is fixedly connected to the breaking piston. An ammonia storage cavity is opened inside the restoring column, a liquid inlet hole is opened on the side of the restoring column, and a release mechanism provided on the restoring column enables the ammonia water in the ammonia storage cavity to be controllably released.

[0009] Further, the first release mechanism is constituted by a release hole opened at the top of the restoring column and coinciding with the central axis of the restoring column.

[0010] Further, the second release mechanism includes: a liquid injection hole opened at the top of the restoring column, with its center line perpendicular to the center line of the restoring column; a spherical cap movably installed at the top of the restoring column, with a left spray head and a right spray head opened on the side, and either the left spray head or the right spray head is communicated with the liquid injection hole, and a reset groove is opened at the top; a spherical column movably installed at the top of the restoring column, and a reset roller located in the reset groove is movably installed on the side.

[0011] Further, a ammonia collecting cotton sleeve is fixedly connected to the side of the stirring rod and is located between the limiting retaining ring and the connecting head.

[0012] Further, it further includes: the liquid inlet hole is a stepped hole; a detection piston is movably installed inside the restoring column, one end extends to the outer side of the restoring column, and a detection spring is provided between the detection piston and the inside of the restoring column; a detection push rod is hinged to the inside of the breaking piston, the end of the detection piston extending from the restoring column abuts against the detection push rod, a reset arm is fixedly connected to the top end of the detection push rod; and a reset ball head is fixedly connected to the bottom of the spherical cap.

[0013] Further, the detection push rod is in an "L" shape.

[0014] Further, the reset arm is in a triangular prism shape, and a bevel is opened at the top of the reset arm.

[0015] The present invention has the following beneficial effects:

[0016] A device specifically used for SCR denitration of flue gas in the cement kiln tail system provided by this application has a mixing pipe arranged in the flue gas passage. When ammonia water and flue gas enter the mixing pipe in a mixed state, the closed mixing pipe can effectively extend the mixing time of ammonia water and flue gas. This not only gives the two more sufficient contact opportunities but also improves the mixing uniformity.

[0017] To further enhance the mixing effect between ammonia water and flue gas, a drive motor is also equipped inside the device. This motor can drive the stirring rod to continuously rotate inside the mixing pipe. The rotation of the stirring rod can further form turbulence and eddy currents, thus greatly enhancing the mixing uniformity.

[0018] When the mixture of ammonia water and flue gas reaches a certain mixing time and intensity inside the mixing pipe, they will pass through the mixed-flow filter plate for further homogenization and be ejected again from the filter plate. This design ensures that the mixture has achieved the optimal mixing state before entering the SCR reactor.

[0019] Therefore, through various means such as extending the mixing time, enhancing the stirring intensity, and mixing and ejecting, this application has jointly achieved the uniform mixing effect of ammonia water and flue gas in the SCR denitration device for the flue gas of the cement kiln tail system. This not only improves the denitration efficiency and reduces the risk of ammonia escape but also provides strong technical support for the environmental protection treatment of the cement kiln tail system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings forming a part of the specification depict the embodiments disclosed in this application and, together with the specification, are used to explain the principles disclosed in this application.

[0021] Referring to the drawings, this application can be more clearly understood according to the following detailed description, where:

[0022] Figure 1 is a three-dimensional structure schematic diagram of the overall shape;

[0023] Figure 2 is a three-dimensional structure schematic diagram of the overall interior and a partially enlarged structure;

[0024] Figure 3 is a front sectional structure schematic diagram of the inside of the mixing pipe;

[0025] Figure 4 is Figure 3 the enlarged structure schematic diagram at position E in

[0026] Figure 5 is a three-dimensional structure schematic diagram of the stirring rod;

[0027] Figure 6 is a three-dimensional structure schematic diagram of the mixed-flow filter plate;

[0028] Figure 7 is a three-dimensional structure schematic diagram of the sectional piston;

[0029] Figure 8 is a three-dimensional structure schematic diagram of the inside of the double-push column;

[0030] Figure 9 is a three-dimensional schematic diagram of the outer shape of the ball cap;

[0031] Figure 10 Schematic diagram of the three-dimensional structure for detecting the push rod

[0032] Figure 11 Schematic diagram of the installation position of the reversing baffle

[0033] In the figure: 1. Support base; 2. Reactor; 200. Catalyst plate; 3. Connecting pipe; 4. Mixing pipe; 5. Air flow reversing seat; 6. Diverging pipe; 7. Dust collector; 700. Gas transmission pipe; 8. Ammonia liquid input pipe; 800. Liquid transmission pipe; 9. Mixed flow filter plate; 10. Driving motor; 11. Transmission rod; 12. Breaking piston; 13. Stirring rod; 130. Connecting top head; 131. Limit retaining ring; 132. Ammonia collecting cotton sleeve; 14. Reversing baffle; 140. Reversing hole; 141. Reversing lever; 15. Re-pushing column; 150. Ammonia storage cavity; 151. Liquid injection hole; 152. Liquid inlet hole; 16. Detection piston; 160. Detection spring; 17. Detection push rod; 170. Reset arm; 18. Ball cap; 180. Reset groove; 181. Reset ball head; 182. Left spray head; 183. Right spray head; 19. Ball column; 190. Reset roller. Specific implementation manners

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a 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 of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0035] Embodiment 1

[0036] Please refer to Figure 1 and Figure 2 It can be clearly seen that the support base 1 provides stable support for the entire device, and the reactor 2 is fastened to the support base 1 by bolts. As can be seen from Figure 2 it, multiple layers of catalyst plates 200 are provided in the reactor 2. When the flue gas and ammonia pass through the reactor 2 filled with the catalyst plates 200, the reduction reaction occurs between NOx and NH3 under the action of the catalyst, thereby generating nitrogen and water, so as to complete the purification treatment of the flue gas.

[0037] The top of the reactor 2 is fixedly connected with a connecting pipe 3 through a flange. As can be clearly seen from Figure 2 and Figure 3 it, the top of the connecting pipe 3 is fixedly connected with a mixing pipe 4. The mixing pipe 4 is in the shape of a cylindrical barrel with a through middle part. The connecting pipe 3 can be used to connect both ends of the mixing pipe 4 to the input end of the reactor 2.

[0038] The shunt pipe 6 is fixedly connected to the side of the mixing pipe 4, and a dust collector 7 is fixedly connected to the top of the shunt pipe 6. The dust collector 7 is connected to an external input fan through an air delivery pipe 700, so as to ensure that when the flue gas is transported to the mixing pipe 4, the flue gas is first input into the dust collector 7 through the fan via the air delivery pipe 700, and a large number of particles in the flue gas are removed by the dust collector 7. Finally, the flue gas flows into the mixing pipe 4 through the shunt pipe 6. Thus, the transportation of the flue gas into the mixing pipe 4 is completed.

[0039] Since the flue gas needs to be mixed with a reducing agent, the reducing agent is generally ammonia water, and ammonia gas is volatilized from the ammonia water to achieve uniform mixing of ammonia gas and flue gas. In order to improve the mixing intensity, combined with Figure 2 、 Figure 3 and Figure 7 it can be clearly seen that an ammonia liquid input pipe 8 is fixedly connected to the side of the connecting pipe 3, and a flow pipe 800 located in the inner cavity of the mixing pipe 4 is movably installed inside the ammonia liquid input pipe 8. In actual application, the ammonia liquid input pipe 8 is connected to an ammonia delivery pump, and a flow meter is also provided on the ammonia liquid input pipe 8. Thus, when the ammonia delivery pump inputs ammonia water into the inner cavity of the mixing pipe 4 through the ammonia liquid input pipe 8 and the flow pipe 800, the flow meter can accurately reflect the total amount of ammonia water output outward, so as to facilitate the adjustment of the ammonia water output amount in the later stage.

[0040] Mixed flow filter plates 9 are movably installed at both ends of the mixing pipe 4, and through holes are provided on the mixed flow filter plates 9 to ensure that when ammonia gas and flue gas are ejected from the through holes, the mixed gas flow is evenly ejected outward. At the same time, a driving motor 10 is fixedly installed inside the connecting pipe 3, and the driving motor 10 is connected to a breaking piston 12 sleeved in the inner cavity of the mixing pipe 4 through a transmission rod 11 fixed to the output shaft, so that when the driving motor 10 rotates, the breaking piston 12 is driven to rotate synchronously by the transmission rod 11.

[0041] Furthermore, a plurality of stirring rods 13 are movably installed on the breaking piston 12, and the stirring rods 13 are arranged equidistantly on the breaking piston 12, so that when the breaking piston 12 rotates, the stirring rods 13 rotate in the mixing pipe 4, thereby intensifying the mixing of the flue gas and ammonia gas volatilized from ammonia water in the mixing pipe 4.

[0042] In actual application, the flue gas is pressurized by a fan and transported to the dust collector 7. After the large particle impurities in the flue gas are removed by the dust collector 7, the flue gas enters the inside of the mixing pipe 4 through the shunt pipe 6, while the ammonia water is transported into the ammonia liquid input pipe 8 by an ammonia delivery pump, and the output ammonia water volume is detected by a flow meter. The ammonia water in the ammonia liquid input pipe 8 is finally transported into the inner cavity of the mixing pipe 4 through the flow pipe 800. After the ammonia water volatilizes in the inner cavity of the mixing pipe 4, it will be mixed with the flue gas in the inner cavity of the mixing pipe 4.

[0043] Since the drive motor 10 drives the breaking piston 12 to rotate through the transmission rod 11, the stirring rod 13 arranged on the breaking piston 12 further mixes ammonia gas and flue gas in the mixing pipe 4. Finally, the mixed gas flow is uniformly output from the mixing flow filter plate 9 into the communication pipe 3 and is transported to the reactor 2 through the communication pipe 3. The gas flow mixture further reacts on the catalyst plate 200 to achieve the purification work of the flue gas.

[0044] Embodiment 2

[0045] On the basis of Embodiment 1, in order to enhance the mixing time of flue gas and ammonia gas, please refer to Figure 3 It can be clearly seen that the breaking piston 12 can reciprocate along the central axis of the mixing pipe 4. At the same time, the inner cavity of the mixing pipe 4 is divided into two chambers, the left and the right, by the breaking piston 12, and the two chambers are respectively communicated through the corresponding mixing flow filter plates 9 and communication pipes 3. As can be seen from Figure 3 that the shunt pipe 6 is respectively communicated with both ends of the mixing pipe 4, so that the shunt pipe 6 can be communicated with both chambers. In order to ensure normal transmission between the breaking piston 12 and the drive motor 10, the transmission rod 11 is preferably a square rod or an elliptical rod that can expand and contract and transmit torque.

[0046] Refer to Figure 3 、 Figure 5 and Figure 6 It can be clearly seen that connecting heads 130 are fixedly connected to both ends of the stirring rod 13, and the shape of the connecting head 130 is conical. The bottom diameter of the connecting head 130 is slightly larger than the diameter of the stirring rod 13. A limiting retaining ring 131 is fixedly connected to the side of the stirring rod 13 near the connecting head 130. Combining Figure 2 and Figure 3 it can be seen that when the breaking piston 12 pushes the limiting retaining ring 131 towards the mixing flow filter plate 9, the connecting head 130 will pass through the through hole in the mixing flow filter plate 9. At the same time, since the length of the stirring rod 13 is less than the distance between the two mixing flow filter plates 9, the stirring rod 13 can only be connected to the mixing flow filter plate 9 singly. Further, by making the connecting head 130 of rubber, when the connecting head 130 passes through the through hole on the mixing flow filter plate 9, the through hole will squeeze the connecting head 130. After the connecting head 130 completely passes through the through hole, when the stirring rod 13 needs to separate the connecting head 130 from the mixing flow filter plate 9, a certain resistance needs to be overcome.

[0047] An air flow reversing seat 5 is fixedly connected to the outside of the mixing pipe 4. As can be seen from Figure 11It can be seen that a reversing baffle 14 is movably installed inside the air flow reversing seat 5. Through the reversing holes 140 opened near both ends of the reversing baffle 14, when the reversing baffle 14 moves in the air flow reversing seat 5, the inner cavities of the shunt pipe 6 and the mixing pipe 4 are communicated through one reversing hole 140, and the other is away from the shunt pipe 6, and the other shunt pipe 6 is blocked by the reversing baffle 14, so as to ensure that the shunt pipe 6 can only communicate with the mixing pipe 4 singly. More specifically, in order to realize the movement of the reversing baffle 14, a reversing rod 141 extending into the inner cavity of the mixing pipe 4 is fixedly connected to the bottom of the reversing baffle 14. Thus, when the breaking piston 12 moves, the breaking piston 12 is used to push the reversing rod 141, so as to control the inflow path of the flue gas in the shunt pipe 6 into the mixing pipe 4.

[0048] Combined Figure 3 with Figure 4 it can be clearly seen that a restoring push column 15 perpendicular to the midline of the breaking piston 12 is movably installed on the outer side of the middle part of the breaking piston 12, and the top of the restoring push column 15 is hemispherical. When the breaking piston 12 rotates, the restoring push column 15 is affected by the rotational centrifugal force, forcing the restoring push column 15 to have a strength to push outwards. Combined Figure 11 it can also be seen that bevels are provided on the inner sides of both ends of the mixing pipe 4. When the restoring push column 15 abuts against the bevel, the movement intensity of the breaking piston 12 will be further increased.

[0049] Specifically, taking Figure 3 as an example, when the right chamber of the mixing pipe 4 communicates with the shunt pipe 6 through the reversing hole 140, the left chamber of the mixing pipe 4 and the shunt pipe 6 are in a non-communicating state. At the same time, the right mixing filter plate 9 is blocked by the connecting head 130.

[0050] As the flue gas in the shunt pipe 6 is pressurized by the fan and conveyed to the right chamber of the mixing pipe 4, the pressure in the right chamber will increase, thereby pushing the breaking piston 12 to have a tendency to move to the left. At this time, the restoring push column 15 is retracted into the breaking piston 12 under the block of the inner side of the mixing pipe 4. Through the agitation of the stirring rod 13 driven by the breaking piston 12 in the inner cavity of the mixing pipe 4, the flue gas and ammonia in the right chamber are evenly mixed. Since the flue gas and ammonia in the right chamber cannot be discharged from the right mixing filter plate 9, the time for the flue gas to stay in the right chamber of the mixing pipe 4 is increased, and thus the mixing time of ammonia and flue gas is prolonged.

[0051] When the breaking piston 12 is pushed to the left, the flue gas in the left chamber of the mixing tube 4 will be conveyed into the connecting pipe 3 after passing through the mixing flow filter plate 9. When the breaking piston 12 continues to move to the left until the reset push column 15 on the breaking piston 12 moves to the inclined surface on the left side of the mixing tube 4, since the breaking piston 12 is always driven by the driving motor 10 to rotate, therefore, under the influence of centrifugal force, the reset push column 15 will closely adhere to the inclined surface of the mixing tube 4 and move along the inclined surface through the reset push column 15, further accelerating the movement of the breaking piston 12 to the left. At this time, the limit retaining ring 131 on the left side of the stirring rod 13 is pushed and will pull the stirring rod 13 to move to the left, thereby causing the connecting head 130 at the right end of the stirring rod 13 to disengage from the mixing flow filter plate 9 on the right side, and the connecting head 130 at the left end to insert into the mixing flow filter plate 9 on the left side. In this way, by the movement of the stirring rod 13, the left chamber of the mixing tube 4 is blocked, and the mixed ammonia gas and flue gas on the right side are communicated with the connecting pipe 3. At the same time, when the breaking piston 12 moves to the left, the breaking piston 12 will push the reversing shift lever 141 to move to the left, thereby causing the reversing shift hole 140 on the reversing baffle 14 to communicate the shunt pipe 6 and the left chamber of the mixing tube 4, while the right chamber of the mixing tube 4 is blocked by the reversing baffle 14 and the shunt pipe 6. Therefore, as the blower continuously sends flue gas into the left chamber of the mixing tube 4, it will force the breaking piston 12 to have a tendency to be pushed to the right. The breaking piston 12 moving to the right will output the mixed air flow in the right chamber of the mixing tube 4 into the connecting pipe 3, and the flue gas and ammonia gas in the left chamber of the mixing tube 4 will be retained and mixed again, thereby prolonging the mixing time of ammonia gas and flue gas and increasing the uniformity of mixing between the two.

[0052] In order to better ensure that the ammonia water can be conveyed to the corresponding chamber of the mixing tube 4, as can be seen from Figure 3 and Figure 4 the end of the flow conveying pipe 800 located inside the mixing tube 4 is fixedly connected to the breaking piston 12. A ammonia storage chamber 150 is provided inside the reset push column 15. When the reset push column 15 retracts into the breaking piston 12, the liquid inlet hole 152 provided on the side of the reset push column 15 is communicated with the flow conveying pipe 800, so as to ensure that the ammonia water in the flow conveying pipe 800 can be conveyed into the ammonia storage chamber 150 when the reset push column 15 retracts into the breaking piston 12.

[0053] In order to enable the ammonia water to spill out, in the second embodiment, a release hole coinciding with the central axis of the reset push column 15 can be provided at the top of the reset push column 15, so as to ensure that the ammonia water can be discharged from the release hole under the action of centrifugal force. Specifically, when the reset push column 15 retracts into the breaking piston 12, the release hole provided at the top of the reset push column 15 will abut against the inner side of the mixing tube 4. When actually provided, the position of the release hole is as Figure 4As shown in the figure, the position of the ball column 19 is the opening part of the release hole. Therefore, when ammonia water is transported to the ammonia storage chamber 150, since the release hole is blocked, the ammonia water will always remain in the ammonia storage chamber 150.

[0054] As mentioned above, as the breaking piston 12 moves towards the mixing filter plate 9, the return push column 15 will move towards the inclined surface of the mixing tube 4. Since the ammonia water contained in the ammonia storage chamber 150 increases the weight of the return push column 15, combined with the centrifugal force formula F = mv2 / r (where F represents centrifugal force, m represents the mass of the object, v represents the speed of the object, and r represents the distance from the object to the rotation center), it can be known that as the mass of the return push column 15 increases, the intensity of outward movement increases, making the movement intensity of the return push column 15 along the inclined surface increase, ensuring that the breaking piston 12 has sufficient movement intensity to push the stirring rod 13 and the reversing shift lever 141 to move.

[0055] Along with the ammonia water in the ammonia storage chamber 150 being ejected into the corresponding chamber, on the one hand, it ensures that the ammonia water is input into the corresponding inner cavity of the mixing tube 4. On the other hand, as the return push column 15 extends outwards, the ammonia storage chamber 150 and the flow pipe 800 are no longer connected. The ammonia water in the ammonia storage chamber 150 is discharged through the release hole, resulting in a decrease in the overall mass of the return push column 15. Subsequently, as mentioned above, when the shunt pipe 6 continuously transports flue gas into the inner cavity of the mixing tube 4, the breaking piston 12 is pushed to move by the flue gas pressure. Since the mass of the return push column 15 is greatly reduced at this time, its centrifugal force is also relatively reduced, making it easier for the breaking piston 12 to cause the return push column 15 to retract into the breaking piston 12 through the inclined surface during movement, thereby reducing the retraction intensity of the return push column 15.

[0056] This method not only ensures that the breaking piston 12 has sufficient movement intensity when pushing the limit retaining ring 131 and the reversing shift lever 141, but also enables the ammonia water to be transported to the corresponding chamber. Moreover, as the ammonia water is output, the centrifugal force of the return push column 15 is relatively reduced, making it easier for the breaking piston 12 to be reset under the flue gas pressure, ensuring that the breaking piston 12 can perform reciprocating circular motion in the mixing tube 4.

[0057] It should be noted that, combined with Figure 2 and Figure 3 As can be seen, when the mixing filter plate 9, the flow pipe 800, and the transmission rod 11 are sleeved and connected, the rotation of the transmission rod 11 driving the flow pipe 800 will force the mixing filter plate 9 to rotate synchronously. Furthermore, it ensures that the two mixing filter plates 9 rotate respectively according to the flow pipe 800 and the transmission rod 11, ensuring the synchronous movement of the mixing filter plate 9 and the breaking piston 12, making it easier for the stirring rod 13 to directly insert into the through hole of the mixing filter plate 9 when moving along the center line of the mixing tube 4.

[0058] Embodiment III

[0059] Based on the second embodiment, as another way to release the ammonia water in the ammonia storage chamber 150, please refer to Figure 3 , Figure 4 , Figure 8 and Figure 9 It can be clearly seen that a liquid injection hole 151 perpendicular to the center line of the double-push column 15 is opened at the top of the double-push column 15. Moreover, a ball cap 18 is sleeved on the top of the double-push column 15, and a left spray head 182 and a right spray head 183 are opened on the ball cap 18. Only one of the left spray head 182 and the right spray head 183 can communicate with the liquid injection hole 151.

[0060] A reset groove 180 is opened at the top of the ball cap 18. The shape of the reset groove 180 is V-shaped. A ball column 19 is movably installed at the top of the double-push column 15. A ball is arranged at the top of the ball column 19, and a reset roller 190 located in the reset groove 180 is movably installed on the side. When the reset roller 190 is at the bottom of the reset groove 180, that is, the ball column 19 retracts into the ball cap 18. At this time, the ball cap 18 closes the liquid injection hole 151.

[0061] Taking Figure 3 as an example, when the right shunt pipe 6 communicates with the chamber on the right side of the mixing pipe 4, as the pressure in the chamber on the right side of the mixing pipe 4 increases, it forces the cut-off piston 12 to push to the left. During the movement of the cut-off piston 12 inside the mixing pipe 4, the ball on the ball column 19 abuts against the inside of the mixing pipe 4, and the reset roller 190 abuts against the bottom of the reset groove 180, thereby forcing the ball cap 18 to block the liquid injection hole 151.

[0062] When the cut-off piston 12 is pushed by the flue gas pressure in the right side of the mixing pipe 4 to near the inclined surface, since the drive motor 10 always drives the transmission rod 11 to rotate clockwise, the rotation direction refers to Figure 2 , the double-push column 15 will move towards the inclined surface inside the mixing pipe 4 under the influence of its own gravity and the ammonia water in the ammonia storage chamber 150. The ball cap 18 partially contacts the inclined surface. Since the double-push column 15 rotates following the cut-off piston 12, the ball cap 18 will rotate on the inclined surface. On the one hand, when the double-push column 15 ejects outward along the left inclined surface, the cut-off piston 12 has a tendency to move further to the left. On the other hand, when the ball cap 18 contacts the inclined surface, the rotation of the double-push column 15 makes the liquid injection hole 151 communicate with the left spray head 182. As the ball cap 18 rotates on the double-push column 15, the reset roller 190 will be pushed by the reset groove 180 to cause the ball cap 18 to move outward. As the ball column 19 continues to move outward, it will be limited by the bolt fixed in the reset groove 180, as shown in Figure 9 .

[0063] The connection between the liquid injection hole 151 and the left spray head 182 enables the ammonia water in the ammonia storage cavity 150 to be directed and sprayed into the left chamber of the mixing pipe 4. As the ball cap 18 rotates synchronously with the breaking piston 12, the ammonia water sprayed from the left spray head 182 is forced to be evenly discharged into the left chamber of the mixing pipe 4.

[0064] Finally, as the connecting head 130 seals the mixing flow filter plate 9 on the left side, the flue gas pressure in the left chamber of the mixing pipe 4 increases, thereby pushing the breaking piston 12 to move to the right. When the breaking piston 12 moves to the right inclined plane of the mixing pipe 4, due to the relative movement between the ball cap 18 and the right inclined plane, the right spray head 183 communicates with the liquid injection hole 151, ensuring that the ammonia water in the ammonia storage cavity 150 is evenly sprayed into the right chamber of the mixing pipe 4. This cycle ensures that the ammonia water is evenly dispersed into the inner cavity of the mixing pipe 4.

[0065] On the basis of the above, in order to further ensure that the ammonia water can be more effectively retained in the inner cavity of the mixing pipe 4, referring to Figure 2 、 Figure 5 and Figure 6 it can be clearly seen that an ammonia collecting cotton sleeve 132 is fixedly connected to the side of the stirring rod 13 between the limit retaining ring 131 and the connecting head 130. Thus, when the ammonia water is evenly sprayed from the left spray head 182 or the right spray head 183 into the inner cavity of the mixing pipe 4, the ammonia collecting cotton sleeve 132 can absorb the ammonia water to avoid excessive deposition of the ammonia water at the bottom of the inner cavity of the mixing pipe 4. At the same time, since there are multiple stirring rods 13 and each stirring rod 13 has an ammonia collecting cotton sleeve 132, the ammonia collecting cotton sleeve 132 can disperse the ammonia water to various parts of the inner cavity of the mixing pipe 4, ensuring the efficient mixing of the ammonia gas generated by the ammonia water and the flue gas.

[0066] Embodiment Four

[0067] On the basis of further improvement of Embodiment Three, please refer to Figure 3 、 Figure 4 、 Figure 8 and Figure 10 it can be clearly seen that the retracting column 15 is ensured to reciprocate only along the radial direction of the breaking piston 12 through the guiding strip on the outside. The liquid inlet hole 152 is a stepped hole, and a detection piston 16 sleeved with the liquid inlet hole 152 is movably installed according to the inside of the retracting column 15, and the detection piston 16 is sleeved and connected with the shortest hole diameter of the stepped hole. As can be seen from Figure 4 one end of the detection piston 16 passes through the side part of the retracting column 15 and the guiding strip, and a ball is arranged at this end. At the same time, a detection spring 160 is arranged between the detection piston 16 and the inside of the retracting column 15, so as to ensure that the detection piston 16 is always located in the short-diameter stepped hole of the liquid inlet hole 152 under normal state through the elastic force of the detection spring 160.

[0068] Inside the breaking piston 12, a detection push rod 17 located on one side of the double-push column 15 is hinged. The end of the detection piston 16 abuts against the detection push rod 17. The detection push rod 17 is in an "L" shape. Moreover, a reset arm 170 is fixedly connected to the top end of the detection push rod 17. As can be seen from Figure 10 , the reset arm 170 is in a triangular prism shape, and an inclined angle is provided at the top of the reset arm 170. Correspondingly, a reset ball head 181 is fixedly connected to the bottom of the ball cap 18. When the reset roller 190 on the ball column 19 extends into the bottom of the reset groove 180, the ball cap 18 blocks the liquid injection hole 151. At the same time, the reset ball head 181 abuts against the reset arm 170.

[0069] During specific operation, taking Figure 2 and Figure 3 as an example, the fan pressurizes the flue gas and conveys it into the gas transmission pipe 700. After the large-particle dust is screened out by the dust collector 7, it is input into the mixing pipe 4 through the shunt pipe 6. At this time, the commutation blocking hole 140 communicates the right shunt pipe 6 with the right chamber of the mixing pipe 4, and the commutation baffle 14 cuts off the left shunt pipe 6 from the left chamber of the mixing pipe 4. Therefore, the flue gas input into the right side of the mixing pipe 4 will push the breaking piston 12 to move to the left. When the breaking piston 12 squeezes the left chamber of the mixing pipe 4, the flue gas in the left chamber is input into the reactor 2 from the mixing filter plate 9 on the left through the connecting pipe 3. After the mixed flue gas reacts on the catalyst plate 200, it is output from the bottom of the reactor 2.

[0070] During the process of the breaking piston 12 moving to the left, since the ball column 19 is blocked by the inner side of the mixing pipe 4, the reset roller 190 is forced to press on the bottom of the reset groove 180, resulting in the ball cap 18 blocking the liquid injection hole 151. At the same time, the reset ball head 181 presses the reset arm 170, forcing the detection push rod 17 to deflect towards the double-push column 15, and the detection piston 16 is pushed to the left through the detection push rod 17, causing the detection spring 160 to be stretched. At this time, the liquid inlet hole 152 and the ammonia storage chamber 150 are connected, and the external ammonia transfer pump conveys ammonia water into the liquid inlet hole 152 through the ammonia liquid input pipe 8 and the flow pipe 800 until the ammonia water is input into the ammonia storage chamber 150.

[0071] As the airflow pushes the breaking piston 12 to continuously move leftward, when the reset push column 15 on the breaking piston 12 moves to the inclined surface on the left side of the mixing tube 4, the breaking piston 12 also simultaneously moves near the left limiting retaining ring 131 of the stirring rod 13. Since the driving motor 10 drives the breaking piston 12 to continuously rotate clockwise through the transmission rod 11, the breaking piston 12 drives the reset push column 15 to rotate. When the reset push column 15 and the ammonia water in the ammonia storage cavity 150 rotate, they tend to move outward under the action of centrifugal force. When the reset push column 15 pushes the ball cap 18 against the inclined surface on the left side of the mixing tube 4, the ball cap 18 moves away from the reset arm 170, and the detection spring 160 pulls the detection piston 16 under its own elastic force to block the liquid inlet hole 152 until the connection part of the detection push rod 17 and the reset arm 170 abuts against the breaking piston 12. At this time, the detection push rod 17 is perpendicular to the center line of the breaking piston 12, and due to the blockage of the detection push rod 17, the detection piston 16 is forced to always block the liquid inlet hole 152.

[0072] The reset push column 15 continuously moves towards the inclined surface, resulting in an increase in the intensity of the leftward movement of the breaking piston 12. As the length of the reset push column 15 extending outward continuously increases, the intensity of the leftward movement of the breaking piston 12 also continuously increases. At the same time, when the ball cap 18 and the inclined surface relatively move on the left inclined surface of the mixing tube 4, the liquid injection hole 151 communicates with the left spray head 182. However, since the liquid inlet hole 152 is still blocked by the detection piston 16 at this time, due to the pressure difference in the ammonia storage cavity 150, the ammonia water in the ammonia storage cavity 150 cannot be normally output from the liquid injection hole 151 to the left spray head 182. In this way, it is ensured that when the reset push column 15 swings outward, the mass of the reset push column 15 will not decrease due to the outward output of the ammonia water in the ammonia storage cavity 150, that is, when the reset push column 15 contacts the inclined surface, the centrifugal force of the reset push column 15 outward is the largest. Until the breaking piston 12 moves leftward and pushes the limiting retaining ring 131 and blocks the left mixing flow filter plate 9 according to the connecting head 130 on the left side, and the limiting retaining ring 131 pushes the reversing shift lever 141 leftward, so that the shunt tube 6 communicates with the left chamber of the mixing tube 4 through the reversing hole 140, and the reversing baffle 14 cuts off the right chamber of the mixing tube 4 and the shunt tube 6. And, as the connecting head 130 disengages from the right mixing flow filter plate 9, the mixed airflow in the right chamber can be output to the connecting pipe 3 through the mixing flow filter plate 9.

[0073] Afterwards, as the detection spring 160 moves to the outer "L" - shaped corner of the detection push rod 17, due to the centrifugal force generated by the rotation of the ammonia water in the ammonia storage chamber 150, the pressure in the ammonia storage chamber 150 is forced to decrease. As a result, the detection piston 16 compresses the detection spring 160, causing the liquid inlet hole 152 to open. After the airflow in the mixing tube 4 enters the ammonia storage chamber 150, the ammonia water in the ammonia storage chamber 150 normally sprays out from the liquid injection hole 151 and the left spray head 182. When the left spray head 182 rotates and sprays, the left ammonia - collecting cotton sleeve 132 will be wetted by the ammonia water. When the ammonia water volatilizes, it can act on various parts in the left - hand space of the mixing tube 4, ensuring uniform mixing of the flue gas and ammonia in the left - hand chamber of the mixing tube 4.

[0074] Since the ammonia water in the ammonia storage chamber 150 continuously discharges outward, there is always a relatively low pressure in the ammonia storage chamber 150, which causes the detection piston 16 to compress the detection spring 160, ensuring that the liquid inlet hole 152 is always open. Since the extended detection spring 160 abuts against the detection push rod 17, when the ammonia water in the ammonia storage chamber 150 has not been completely discharged outward, it is blocked by the detection push rod 17, preventing the retraction post 15 from retracting inward. Combining the above, the retraction of the retraction post 15 is due to the blocking of the inclined plane on the ball cap 18 and the pressure in the left - hand airflow chamber of the mixing tube 4 pushing the breaking piston 12 to move to the right. Therefore, when the retraction of the retraction post 15 is restricted, the movement of the breaking piston 12 to the right is also restricted. Since the ammonia water in the ammonia storage chamber 150 is externally quantitatively supplied to the ammonia storage chamber 150, all the discharged ammonia water can reach the preset ammonia water discharge amount by the construction personnel. When all the ammonia water in the ammonia storage chamber 150 has been discharged outward, the pressure in the ammonia storage chamber 150 is relatively balanced with the pressure in the left - hand chamber of the mixing tube 4 through the left spray head 182. Under the elastic force of the detection spring 160, it will push the detection piston 16 to block the liquid inlet hole 152 again. At this time, the detection piston 16 is away from the corner of the detection push rod 17. The breaking piston 12 is affected by the flue gas pressure in the left - hand chamber of the mixing tube 4 and has a tendency to move to the right. Since all the ammonia water in the ammonia storage chamber 150 has been discharged, the overall mass of the retraction post 15 decreases. From the centrifugal force formula, it can be known that when the mass of the retraction post 15 decreases, the outward - pushing intensity also decreases. Thus, during the process of the breaking piston 12 being pushed to the right, it is easier for the ball cap 18 to be pushed by the inclined plane and retract into the breaking piston 12.

[0075] When the retraction post 15 retracts into the breaking piston 12, the fluid delivery pipe 800 communicates with the liquid inlet hole 152. If the ball column 19 is not reset at this time, the left spray head 182 still communicates with the liquid injection hole 151. At this time, since the liquid inlet hole 152 is blocked by the detection piston 16, the ammonia water in the fluid delivery pipe 800 cannot be delivered into the ammonia storage chamber 150.

[0076] As the breaking piston 12 continuously moves to the right, the inner side of the mixing tube 4 will push against the ball column 19, further causing the ball column 19 to move downward and move along the reset groove 180 through the reset roller 190. Thus, the injection hole 151 is blocked by the rotation of the ball cap 18. At this time, the ball column 19 fits against the inner side of the mixing tube 4 through the ball at the top, reducing the sliding resistance between the two. When the ball cap 18 moves away from the inner side of the mixing tube 4, it is also easier for the ball column 19 to push the ball cap 18 to rotate.

[0077] During the process of the reset roller 190 moving to the bottom of the reset groove 180, the reset ball head 181 follows the rotation of the ball cap 18 and pushes the reset arm 170 to move. The reset arm 170 deflects to the left under the block of the reset ball head 181, prompting the detection push rod 17 to push the detection piston 16 to open the liquid inlet hole 152. Thus, after the injection hole 151 is blocked, the detection piston 16 can connect the liquid inlet hole 152 and the ammonia storage chamber 150, preventing ammonia water from being prematurely delivered to the ammonia storage chamber 150 and then directly discharged from the injection hole 151 and the left spray head 182 connected to the injection hole 151.

[0078] As the breaking piston 12 continuously moves to the right, the reset push column 15 will move to the inclined surface on the right side of the mixing tube 4, and through the relative movement of the ball cap 18 and the right inclined surface, the right spray head 183 is forced to communicate with the injection hole 151. Then, by the same principle as described above, ammonia water is delivered to the right chamber of the mixing tube 4.

[0079] In summary, by making the breaking piston 12 move cyclically left and right, it not only ensures that the mixing tube 4 can output continuous air flow to the connecting pipe 3, but also extends the residence time of the flue gas in the mixing tube 4, thereby increasing the mixing time of the flue gas and ammonia. And according to the content described in the fourth embodiment, it is ensured that during the process of the breaking piston 12 pushing the reversing baffle 14 and the stirring rod 13 to switch, the reset push column 15 maintains the maximum centrifugal force. And through the restriction of the detection piston 16, on the one hand, it prevents ammonia water from being prematurely input into the ammonia storage chamber 150, and on the other hand, it ensures that all the ammonia water in the ammonia storage chamber 150 can be output to the corresponding external chamber, ensuring the controllable output of ammonia water.

Claims

1. A flue gas SCR denitration device for the cement kiln tail system, characterized in that Comprising: A support base (1) with a reactor (2) fixedly connected to its surface and equipped with a catalyst plate (200); A mixing tube (4) communicating with the reactor (2) through a connecting tube (3), with a shunt tube (6) fixed to the outside, and a dust collector (7) fixedly connected to the top of the shunt tube (6), and the dust collector (7) is connected to a blower through an air delivery pipe (700); An ammonia liquid input pipe (8) fixedly connected to the side of the connecting tube (3), with a flow tube (800) located inside the mixing tube (4) movably installed inside, and the ammonia liquid input pipe (8) is connected to an ammonia delivery pump; A mixed flow filter plate (9) movably installed at both ends of the mixing tube (4) respectively, with through holes on its surface; A driving motor (10) fixedly installed inside the connecting tube (3), and a transmission rod (11) fixed to the output shaft is connected to a breaking piston (12) sleeved inside the mixing tube (4); A stirring rod (13) movably installed on the breaking piston (12); Connecting heads (130) respectively fixed at both ends of the stirring rod (13); A limiting retaining ring (131) fixed to the side of the stirring rod (13); An air flow reversing seat (5) fixed to the outside of the mixing tube (4), with a reversing baffle (14) movably installed inside, and two reversing holes (140) are opened on the reversing baffle (14); A reversing rod (141) fixed to the bottom of the reversing baffle (14) and located inside the mixing tube (4); A restoring column (15) movably installed on the outer side of the middle part of the breaking piston (12); Both inner sides at both ends of the mixing tube (4) are provided with bevels; The breaking piston (12) pushes the reversing rod (141) to move, enabling one of the two reversing holes (140) to connect the mixing tube (4) and the shunt tube (6).

2. The SCR denitration device for the flue gas of the cement kiln tail system according to claim 1, wherein The end of the flow tube (800) located inside the mixing tube (4) is fixedly connected to the breaking piston (12). A liquid storage cavity (150) is opened inside the restoring column (15), a liquid inlet hole (152) is opened on the side of the restoring column (15), and a release mechanism provided on the restoring column (15) enables the ammonia water in the liquid storage cavity (150) to be controllably released.

3. The SCR denitration device for the flue gas of the cement kiln tail system according to claim 2, characterized in that, The first release mechanism is composed of a release hole opened at the top of the restoring column (15) and coinciding with the central axis of the restoring column (15).

4. The SCR denitration device for the flue gas of the cement kiln tail system according to claim 2, characterized in that, The second release mechanism includes: An injection hole (151) opened at the top of the restoring column (15), and its center line is perpendicular to the center line of the restoring column (15); A spherical cap (18) movably installed at the top of the restoring column (15), with a left spray head (182) and a right spray head (183) opened on the side, and one of the left spray head (182) and the right spray head (183) is selectively communicated with the injection hole (151), and a reset groove (180) is opened at the top; A spherical column (19) movably installed at the top of the restoring column (15), with a reset roller (190) movably installed on the side and located in the reset groove (180).

5. The SCR denitration device for the flue gas of the cement kiln tail system according to claim 2, characterized in that, A collecting ammonia cotton sleeve (132) is fixedly connected to the side of the stirring rod (13) and located between the limiting retaining ring (131) and the connecting head (130).

6. The SCR denitration device for the flue gas of the cement kiln tail system according to claim 4, characterized in that, It further includes: The liquid inlet hole (152) is a stepped hole; The detection piston (16) is movably installed inside the double push column (15), with one end extending to the outer side of the double push column (15), and a detection spring (160) is arranged between the detection piston (16) and the inner side of the double push column (15); The detection push rod (17) is hinged inside the breaking piston (12), the end of the detection piston (16) extending from the double push column (15) abuts against the detection push rod (17), and a reset arm (170) is fixedly connected to the top end of the detection push rod (17); A reset ball head (181) is fixedly connected to the bottom of the ball cap (18).

7. The SCR denitration device for the flue gas of the cement kiln tail system according to claim 6, characterized in that, The detection push rod (17) is in an "L" shape.

8. The SCR denitration device for the flue gas of the cement kiln tail system according to claim 6, wherein, The reset arm (170) is in a triangular prism shape, and an oblique angle is provided at the top of the reset arm (170).

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