A solid waste cement flue gas zoning adaptive denitrification system and method

Abstract

The present invention belongs to the technical field of cement flue gas denitrification, and in particular to a solid waste cement flue gas zoning adaptive denitrification system and method. Aiming at the problem that the existing denitrification system needs to control the temperature of high-temperature and low-temperature flue gases respectively, and the flue gases cannot fully react with the reducing agent, the following scheme is proposed, which includes a denitrification box, wherein the top inner wall of the denitrification box is fixed with a plurality of upper partitions from left to right, and the bottom inner wall of the denitrification box is fixed with a plurality of lower partitions from left to right, and the plurality of upper partitions and the plurality of lower partitions are arranged in an alternating manner, and the denitrification box and the plurality of upper partitions and the lower partitions form a flue for increasing the time that the flue gas is sprayed in the denitrification box. The present invention fully utilizes the heat energy carried in the flue gas through the cooperation of the first heat transfer bin and the second heat transfer bin, controls the temperature of the flue gas at different temperatures, and ensures that the flue gas is stably denitrated at an appropriate temperature. In addition, during spray denitrification, the contact time and contact area between the flue gas and the reducing agent solution can be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of cement flue gas denitrification, and in particular to a solid waste cement flue gas zoning adaptive denitrification system and method. Background Art

[0002] There are still some deficiencies in the existing technical solutions for denitrification of cement plant flue gas:

[0003] 1. In order to achieve stable and expected efficiency in flue gas denitrification, the flue gas temperature needs to be controlled between 250℃-400℃. However, the temperature of the discharged flue gas is high and low, so additional heating and cooling equipment is needed to control the high and low temperature flue gas respectively, which seriously affects the flue gas denitrification efficiency and increases the initial cost of denitrification.

[0004] 2. During the flue gas denitrification process, the flue gas is often unable to withstand the spraying of the reducing agent for a long time, resulting in the flue gas being unable to fully react with the reducing agent, resulting in unsatisfactory flue gas denitrification efficiency.

[0005] In response to the above problems, the present invention document proposes a solid waste cement flue gas zoning adaptive denitrification system and method. Summary of the invention

[0006] The purpose of the present invention is to solve the existing shortcomings that high-temperature and low-temperature flue gases need to be temperature controlled separately, and the flue gases cannot fully react with the reducing agent, and a solid waste cement flue gas zoning adaptive denitrification system and method are proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A solid waste cement flue gas zoning adaptive denitration system, comprising a denitration box, a top inner wall of the denitration box having a plurality of upper baffles fixed from left to right, a bottom inner wall of the denitration box having a plurality of lower baffles fixed from left to right, and the plurality of upper baffles and the plurality of lower baffles are arranged alternately, the denitration box and the plurality of upper baffles and the plurality of lower baffles form a flue, which is used to increase the time for the flue gas to be sprayed in the denitration box;

[0009] A heat conversion box is arranged on one side of the denitration box and is used to control the temperature of the flue gas to be denitrated. A support plate is fixed on one side of the denitration box, the heat conversion box is fixed on the top of the support plate, and the support plate is used to support the heat conversion box;

[0010] A liquid storage tank, which is fixed at the bottom of the denitration tank and is used to store the reducing agent solution;

[0011] A smoke exhaust pipe is arranged on a side of the denitrification box away from the heat conversion box and is used to discharge the smoke after denitrification;

[0012] The temperature control structure is set in the heat conversion box to control the temperature of the flue gas to be denitrated, so as to facilitate the stable denitration operation in the later stage;

[0013] A full denitration structure is provided in the denitration box to fully react the flue gas with the reducing agent solution;

[0014] The spray structure is arranged in the denitration tank and is used to spray the reducing agent solution in the liquid storage tank on the flue gas from top to bottom.

[0015] In a possible design, the temperature control structure includes a first heat transfer chamber and a second heat transfer chamber arranged in a heat conversion box, and the first heat transfer chamber is located above the second heat transfer chamber, and the first heat transfer chamber contains a heat conversion liquid, and a connecting hole is provided in the heat conversion box, and the first heat transfer chamber and the second heat transfer chamber are connected through the connecting hole, a main smoke pipe is provided on one side of the heat conversion box, a three-way valve is fixed at one end of the main smoke pipe, and the top and bottom of the three-way valve are respectively fixed with the first smoke pipe and the second smoke pipe, and the first smoke pipe and the second smoke pipe They are used for the flow of high-temperature flue gas and low-temperature flue gas respectively. One end of the first smoke pipe extends into the first heat transfer chamber and is fixed with a spiral heat exchange tube. The spiral heat exchange tube cooperates with the liquid in the first heat transfer chamber to exchange heat with the flue gas. One end of the spiral heat exchange tube is fixed and extends into the denitrification box. The high-temperature flue gas enters the spiral heat exchange tube through the first smoke pipe, and heat exchange is completed through the water in the first heat transfer chamber. The flue gas is cooled to between 250℃ and 400℃. The cooled flue gas enters the flue to complete the spraying denitrification operation.

[0016] In a possible design, the temperature control structure also includes a push plate that is sealed and slidably connected to the second heat transfer chamber, and the push plate is used to control the discharge and injection of liquid in the second heat transfer chamber. A threaded rod is rotatably connected to the second heat transfer chamber, and one end of the threaded rod is threadedly penetrated through the push plate. A drive motor is fixed to one side of the heat conversion box through a frame, and the output shaft of the drive motor is fixedly connected to the threaded rod through a coupling. One end of the second smoke pipe is fixedly penetrated through the second heat transfer chamber and extends into the denitration box. One end of the second heat transfer chamber slides through the push plate, and the first smoke pipe and the second The outer wall of the smoke pipe is provided with a first solenoid valve; when the flue gas is at an appropriate temperature, the push plate pushes the liquid in the second heat transfer chamber into the first heat transfer chamber through the connecting hole, and the flue gas enters the flue through the second smoke pipe to ensure that the flue gas is maintained between 250℃-400℃. When the injected flue gas is low-temperature gas, the push plate moves toward the denitrification box, and the liquid in the first heat transfer chamber enters the second heat transfer chamber. When the flue gas enters the second heat transfer chamber through the second smoke pipe, heat exchange is carried out through the liquid in the second heat transfer chamber to increase the temperature of the low-temperature flue gas, and then the flue gas is sprayed for denitrification in the flue.

[0017] In a possible design, the spray structure includes a plurality of spray pipes fixed in a denitrification tank, a plurality of spray heads are provided at the bottom of the plurality of spray pipes, a transfer box is fixed on one side of the denitrification tank, and the transfer box is connected with the plurality of spray pipes through a plurality of connecting pipes, a water pump is fixed on one side of the liquid storage tank through a frame, a liquid inlet end of the water pump is connected with the liquid storage tank through a hose, and a liquid outlet end of the water pump is connected with the transfer box through a hose; the reducing agent solution in the first cavity is pumped into the spray pipe by the water pump, and the flue gas is sprayed downward through the spray head to denitrify the flue gas.

[0018] In one possible design, the sufficient denitrification structure includes a sliding plate that is sealed and slidably connected in the flue, and one side of the sliding plate is slidably connected to the upper partition on the far left, and the sliding plate is located below the first smoke pipe and the second smoke pipe, a plurality of first protrusions are fixed to the inner wall of one side of the flue, a plurality of second protrusions are fixed to one side of the upper partition on the far left, springs are fixed to the tops of the plurality of first protrusions and the second protrusions, and the top of the spring is fixedly connected to the bottom of the sliding plate; when the flue gas enters the flue, the smoke gathers above the sliding plate and is hindered by the sliding plate, so that the smoke gas cannot move along the flue, thereby increasing the time for the smoke gas to be sprayed and allowing the smoke gas to fully terminate with the reducing agent solution.

[0019] In a possible design, the sufficient denitrification structure also includes a plurality of spiral tubes fixedly passing through the sliding plate, which are used to make the flue gas fully contact with the reducing agent solution. A second solenoid valve is provided at the bottom of each of the plurality of spiral tubes, and a support rod is fixed to one side of one of the second protrusions, and a pressure sensor is fixed to the top of the support rod, and the pressure sensor cooperates with the sliding plate. A control center and a time relay are fixed to one side of the denitrification box, and the control center is electrically connected to the time relay and the second solenoid valve. As the flue gas entering above the sliding plate gathers, the flue gas pushes the sliding plate downward, and when the sliding plate squeezes the pressure sensor, the pressure sensor transmits a signal to the control center, and the control center controls the second solenoid valve to open. At this time, the flue gas above the sliding plate and the reducing agent solution on the sliding plate flow downward through the spiral tubes, further increasing the contact time and contact area between the flue gas and the reducing agent solution, and fully denitrifying the flue gas. Then, under the action of the time relay, the second solenoid valve is controlled to close after a certain period of time, so as to seal the subsequent flue gas.

[0020] In one possible design, a plurality of sieve plates are fixed in the flue for filtering impurities in the flue gas, and the sieve plates are located between two adjacent upper partitions and a lower partition, and a rotating shaft is connected in the flue for horizontal rotation, one end of the rotating shaft rotates through a plurality of upper partitions and a lower partition and is fixed with a gear, a plurality of double cams are provided on the outer wall fixed sleeve of the rotating shaft, and the double cams cooperate with the sieve plates for shaking off impurities on the sieve plates, a rack meshing with the gear is fixed on the top of the sliding plate, and the rack is slidably connected with the adjacent upper partition plate; the flue gas is sprayed through the flue, and the sieve plate can adsorb and filter impurities in the flue gas, and in addition, when the sliding plate moves up and down, the sliding plate drives the rotating shaft to rotate through the cooperation of the rack and the gear, and then can knock the sieve plate through the double cams to shake off the impurities adsorbed on the sieve plate, thereby avoiding blockage of the sieve plate.

[0021] In a possible design, a plurality of reflux holes are provided on the inner wall at the bottom of the denitrification tank, and the liquid storage tank and the denitrification tank are connected through the reflux holes, an L-shaped partition is fixed in the liquid storage tank, and the liquid storage tank forms a first cavity and a second cavity through the L-shaped partition, a filter is fixed in the L-shaped partition for filtering the liquid entering the first cavity from the second cavity, and the hose at the liquid inlet end of the water pump is connected to the first cavity; the second cavity recovers the reducing agent solution in the flue, and the filter filters the impurities in the reducing agent solution to prevent the impurities from clogging the spray head in the later stage.

[0022] In a possible design, a drying box is fixed on the top of the denitrification box, a copper plate is fixed in the drying box, a plurality of graphite rods are fixed on the bottom of the copper plate, the bottom ends of the plurality of graphite rods are fixedly extended into the flue, and the copper plate and the drying box are used to recycle the waste heat of the flue gas in the flue; the waste heat in the flue gas is conducted to the copper plate through the graphite rods, the copper plate begins to heat up, and can increase the temperature in the drying box, thereby being able to dry materials commonly used in the cement production process, thereby improving energy utilization and playing a role in energy conservation and emission reduction.

[0023] In the present application, a denitrification method of a solid waste cement flue gas zone adaptive denitrification system comprises the following steps:

[0024] S1. First, we adopt different treatment methods for flue gas with different temperatures. High-temperature flue gas enters the spiral heat exchange tube through a specific flue pipe, uses water for heat exchange, cools it down to between 250℃-400℃, and then enters the flue for spraying denitrification. When the flue gas temperature is moderate, the flow of liquid in the first heat transfer chamber is adjusted to maintain the appropriate temperature of the flue gas. For low-temperature flue gas, the liquid in the first heat transfer chamber is used for heating to raise its temperature to the appropriate range for denitrification.

[0025] S2. Secondly, when the flue gas enters the flue, the reducing agent solution is sprayed through the spray system to denitrate the flue gas. The specially designed sliding plate structure not only increases the contact time between the flue gas and the reducing agent solution, but also triggers the valve to open through its movement, so that the flue gas and the solution are further mixed in the spiral tube, thereby enhancing the denitrification effect;

[0026] S3. At the same time, the sieve plate set in the flue can effectively filter impurities in the flue gas, and the movement of the sliding plate knocks the sieve plate through the mechanical structure to prevent it from being blocked; the filtered impurities flow into the collection chamber with the solution, and after being filtered by the filter, the reducing agent solution can be recycled, thereby improving resource utilization;

[0027] S4. Finally, the residual heat in the flue gas is efficiently utilized and transferred to the drying box through the heat-conducting material for drying the materials in cement production, which not only reduces energy consumption but also realizes the recovery and utilization of waste heat, truly achieving the goal of energy conservation and emission reduction. Through this series of intelligent and refined processing steps, this denitrification method not only improves the denitrification efficiency, but also greatly reduces energy consumption, providing strong support for the green production of the solid waste cement industry.

[0028] Beneficial effects:

[0029] In the present invention, a sliding plate is sealed and slidably connected in the flue, and the sliding plate is located below the first smoke pipe and the second smoke pipe, and a spring is fixed to the top of each of the first and second protrusions, and the top of the spring is fixedly connected to the bottom of the sliding plate; when the smoke enters the flue, the smoke gathers above the sliding plate and is blocked by the sliding plate, so that the smoke cannot move along the flue, thereby increasing the time for the smoke to be sprayed, so that the smoke and the reducing agent solution are fully connected;

[0030] In the present invention, a plurality of spiral tubes are fixedly passed through the sliding plate, one side of one of the second protrusions is fixed with a support rod, and a pressure sensor is fixed on the top of the support rod; as the flue gas entering the top of the sliding plate gathers, the flue gas pushes the sliding plate downward and squeezes the pressure sensor, and the second solenoid valve is opened. At this time, the flue gas above the sliding plate and the reducing agent solution on the sliding plate flow downward through the spiral tube, further increasing the contact time and contact area between the flue gas and the reducing agent solution, and fully denitrifying the flue gas;

[0031] In the present invention, one end of the first smoke pipe extends into the first heat transfer chamber and is fixed with a spiral heat exchange tube, the second heat transfer chamber is sealed and slidably connected with a push plate, one end of the threaded rod is threadedly penetrated through the push plate, one end of the second smoke pipe is fixedly penetrated through the second heat transfer chamber and extends into the denitrification box; the high-temperature flue gas enters the spiral heat exchange tube through the first smoke pipe, and heat exchange is completed through the water in the first heat transfer chamber. When the flue gas is at an appropriate temperature, the flue gas enters the flue through the second smoke pipe to ensure that the flue gas is maintained between 250°C and 400°C. When the injected flue gas is a low-temperature gas, the liquid in the first heat transfer chamber enters the second heat transfer chamber to heat the flue gas passing through the second heat transfer chamber, thereby being able to control the temperature of flue gases at different temperatures to ensure that the flue gas can undergo a denitrification reaction at an appropriate temperature.

[0032] In the present invention, a plurality of sieve plates are fixed in the flue, a rotating shaft is connected in the flue in a transversely rotatable manner, a plurality of double cams are provided on the outer wall fixed sleeve of the rotating shaft, and a rack meshing with a gear is fixed on the top of the sliding plate; the sieve plates can adsorb and filter impurities in the flue gas, and when the sliding plate moves up and down, the sliding plate drives the rotating shaft to rotate through the cooperation of the rack and the gear, and then the double cams can knock the sieve plate to shake off the impurities adsorbed on it, thereby avoiding clogging of the sieve plate.

[0033] In the present invention, the heat energy carried in the flue gas is fully utilized through the cooperation of the first heat transfer chamber and the second heat transfer chamber, and the temperature of the flue gas at different temperatures is controlled to ensure that the flue gas is stably denitrated at a suitable temperature. In addition, during spray denitrification, the contact time and contact area between the flue gas and the reducing agent solution can be increased, so that the flue gas and the reducing agent solution can be fully reacted to perform denitrification. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the three-dimensional structure of a solid waste cement flue gas zone adaptive denitrification system provided in Example 1 of the present invention;

[0035] Figure 2 This is a schematic diagram of the main cross-sectional structure of a solid waste cement flue gas zone adaptive denitrification system provided in Example 1 of the present invention;

[0036] Figure 3 A schematic three-dimensional cross-sectional structure diagram of an upper baffle, a lower baffle and a sieve plate of a solid waste cement flue gas partitioning adaptive denitration system provided in Example 1 of the present invention;

[0037] Figure 4 A schematic three-dimensional cross-sectional structure diagram of a heat conversion box of a solid waste cement flue gas zone adaptive denitration system provided in Example 1 of the present invention;

[0038] Figure 5A schematic diagram of a three-dimensional explosion structure of a spray pipe, a transfer box and a water pump of a solid waste cement flue gas zone adaptive denitration system provided in Example 1 of the present invention;

[0039] Figure 6 A schematic diagram of a three-dimensional exploded cross-sectional structure of a sliding plate, a spring and a spiral tube of a solid waste cement flue gas partitioning adaptive denitration system provided in Example 1 of the present invention;

[0040] Figure 7 A schematic diagram of the three-dimensional structure of the gear and rack coordination of a solid waste cement flue gas zone adaptive denitration system provided in Example 1 of the present invention;

[0041] Figure 8 This is a partial front view and cross-sectional structural schematic diagram of a denitrification box and a drying box of a solid waste cement flue gas zone adaptive denitrification system provided in Example 2 of the present invention.

[0042] In the figure: 1, denitration box; 2, liquid storage tank; 3, heat conversion box; 4, upper partition; 5, lower partition; 6, flue; 7, exhaust pipe; 8, first heat transfer chamber; 9, second heat transfer chamber; 10, main smoke pipe; 11, three-way valve; 12, first smoke pipe; 13, spiral heat exchange tube; 14, second smoke pipe; 15, connecting hole; 16, push plate; 17, drive motor; 18, threaded rod; 19, first solenoid valve; 20, support plate; 21, water pump; 22, transfer box; 23, spray pipe; 24, spray Shower head; 25. sieve plate; 26. sliding plate; 27. spring; 28. spiral tube; 29. ​​second solenoid valve; 30. support rod; 31. pressure sensor; 32. first protrusion; 33. second protrusion; 34. rotating shaft; 35. gear; 36. rack; 37. double cam; 38. reflux hole; 39. L-shaped partition; 40. first cavity; 41. second cavity; 42. filter; 43. control center; 44. time relay; 45. drying box; 46. copper plate; 47. graphite rod. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] Example 1

[0045] Reference Figure 1-Figure 7A denitration system is used in the field of cement flue gas denitration, including a denitration box 1, a plurality of upper baffles 4 are fixed on the top inner wall of the denitration box 1 from left to right, a plurality of lower baffles 5 are fixed on the bottom inner wall of the denitration box 1 from left to right, and the plurality of upper baffles 4 and the plurality of lower baffles 5 are arranged alternately, the denitration box 1 and the plurality of upper baffles 4 and the lower baffles 5 form a flue 6 for increasing the time for the flue gas to be sprayed in the denitration box 1; a heat conversion box 3, which is arranged on one side of the denitration box 1 and is used to control the temperature of the flue gas to be denitrated, a support plate 20 is fixed on one side of the denitration box 1, the heat conversion box 3 is fixed on the top of the support plate 20, and the support plate 20 is used to support the heat conversion box 3; a liquid storage tank 2, which is fixed on the bottom of the denitration box 1 and is used to store a reducing agent solution; a smoke exhaust pipe 7, which is arranged on the side of the denitration box 1 away from the heat conversion box 3, and is used to discharge the flue gas after denitration.

[0046] Reference Figure 2 and Figure 4 The denitration system further comprises a temperature control structure arranged in the heat conversion box 3, which is used to control the temperature of the flue gas to be denitrated, so as to facilitate the stable denitration operation in the later stage; the temperature control structure comprises a first heat transfer bin 8 and a second heat transfer bin 9 arranged in the heat conversion box 3, and the first heat transfer bin 8 is located above the second heat transfer bin 9, and the first heat transfer bin 8 contains the liquid for heat conversion, and a connecting hole 15 is arranged in the heat conversion box 3, and the first heat transfer bin 8 is connected with the second heat transfer bin 9 through the connecting hole 15, and a main smoke pipe 10 is arranged on one side of the heat conversion box 3, and a three-way valve 11 is fixed at one end of the main smoke pipe 10, and the top and bottom of the three-way valve 11 are respectively fixed with the first The first smoke pipe 12 and the second smoke pipe 14 are respectively used for the flow of high-temperature flue gas and low-temperature flue gas. One end of the first smoke pipe 12 extends into the first heat transfer bin 8 and is fixed with a spiral heat exchange tube 13. The spiral heat exchange tube 13 cooperates with the liquid in the first heat transfer bin 8 to exchange heat with the flue gas. One end of the spiral heat exchange tube 13 is fixed and extends into the denitrification box 1. The high-temperature flue gas enters the spiral heat exchange tube 13 through the first smoke pipe 12, and heat exchange is completed through the water in the first heat transfer bin 8, and the flue gas is cooled to between 250°C and 400°C. The cooled flue gas enters the flue 6 to complete the spraying denitrification operation.

[0047] Reference Figure 4The temperature control structure also includes a push plate 16 that is sealed and slidably connected to the second heat transfer chamber 9. The push plate 16 is used to control the discharge and injection of the liquid in the second heat transfer chamber 9. A threaded rod 18 is rotatably connected to the second heat transfer chamber 9, and one end of the threaded rod 18 is threadedly penetrated through the push plate 16. A drive motor 17 is fixed to one side of the heat conversion box 3 through a frame, and the output shaft of the drive motor 17 is fixedly connected to the threaded rod 18 through a coupling. One end of the second smoke pipe 14 is fixedly penetrated through the second heat transfer chamber 9 and extends into the denitration box 1. One end of the second heat transfer chamber 9 slides through the push plate 16. The outer walls of the first smoke pipe 12 and the second smoke pipe 14 are A first solenoid valve 19 is provided; when the flue gas is at an appropriate temperature, the push plate 16 pushes the liquid in the second heat transfer chamber 9 into the first heat transfer chamber 8 through the connecting hole 15, and the flue gas enters the flue 6 through the second smoke pipe 14 to ensure that the flue gas is maintained between 250°C and 400°C. When the injected flue gas is low-temperature gas, the push plate 16 moves toward the denitrification box 1, and the liquid in the first heat transfer chamber 8 enters the second heat transfer chamber 9. When the flue gas enters the second heat transfer chamber 9 through the second smoke pipe 14, heat exchange is performed through the liquid in the second heat transfer chamber 9 to increase the temperature of the low-temperature flue gas, and then the flue gas is sprayed in the flue 6 for denitrification.

[0048] Reference Figure 1 , Figure 6 and Figure 7 The denitration system also includes a sufficient denitration structure arranged in the denitration box 1, which is used to fully react the flue gas with the reducing agent solution; the sufficient denitration structure includes a sliding plate 26 that is sealed and slidably connected in the flue 6, and one side of the sliding plate 26 is slidably connected to the upper partition plate 4 on the far left, and the sliding plate 26 is located below the first smoke pipe 12 and the second smoke pipe 14, a plurality of first protrusions 32 are fixed to the inner wall of one side of the flue 6, and a plurality of second protrusions 33 are fixed to one side of the upper partition plate 4 on the far left, and springs 27 are fixed to the tops of the plurality of first protrusions 32 and the second protrusions 33, and the top of the spring 27 is fixedly connected to the bottom of the sliding plate 26; when the flue gas enters the flue 6, the flue gas gathers above the sliding plate 26, and is hindered by the sliding plate 26, so that the flue gas cannot move along the flue 6, thereby increasing the time for the flue gas to be sprayed, so that the flue gas and the reducing agent solution are fully reacted.

[0049] Reference Figure 6 and Figure 7The full denitration structure also includes a plurality of spiral tubes 28 fixedly penetrating the sliding plate 26, which are used to make the flue gas fully contact with the reducing agent solution. The bottom of the plurality of spiral tubes 28 is provided with a second solenoid valve 29, one side of a second protrusion 33 is fixed with a support rod 30, the top of the support rod 30 is fixed with a pressure sensor 31, and the pressure sensor 31 cooperates with the sliding plate 26, and a control center 43 and a time relay 44 are fixed on one side of the denitration box 1, and the control center 43 is electrically connected with the time relay 44 and the second solenoid valve 29; as the flue gas enters the top of the sliding plate 26, the flue gas is discharged from the flue gas outlet 26, and the flue gas is discharged from the flue gas outlet 26. The flue gas gathers and pushes the sliding plate 26 downward. When the sliding plate 26 squeezes the pressure sensor 31, the pressure sensor 31 transmits a signal to the control center 43. The control center 43 controls the second solenoid valve 29 to open. At this time, the flue gas above the sliding plate 26 and the reducing agent solution on the sliding plate 26 flow downward through the spiral tube 28, further increasing the contact time and contact area between the flue gas and the reducing agent solution, fully denitrifying the flue gas. Then, under the action of the time relay 44, the second solenoid valve 29 is controlled to close after a certain period of time to seal the subsequent flue gas.

[0050] Reference Figure 2 , Figure 7 and Figure 3 A plurality of sieve plates 25 are fixed in the flue 6 for filtering impurities in the flue gas, and the sieve plates 25 are located between two adjacent upper baffles 4 and lower baffles 5. A rotating shaft 34 is connected to the flue 6 in a transverse rotation manner. One end of the rotating shaft 34 rotates through the plurality of upper baffles 4 and lower baffles 5 and is fixed with a gear 35. A plurality of double cams 37 are fixedly sleeved on the outer wall of the rotating shaft 34, and the double cams 37 cooperate with the sieve plates 25 to shake off the impurities on the sieve plates 25. The top of the sliding plate 26 A rack 36 meshing with the gear 35 is fixed to the upper part, and the rack 36 is slidably connected to the adjacent upper partition 4; the flue gas passes through the flue 6 for spraying operation, and the sieve plate 25 can adsorb and filter impurities in the flue gas. In addition, when the sliding plate 26 moves up and down, the sliding plate 26 drives the rotating shaft 34 to rotate through the cooperation of the rack 36 and the gear 35, and then the double cam 37 can knock the sieve plate 25 to shake off the impurities adsorbed on the sieve plate 25 to avoid clogging of the sieve plate 25.

[0051] Reference Figure 1 , Figure 2 and Figure 5The denitration system also includes a spray structure arranged in the denitration tank 1, which is used to spray the reducing agent solution in the liquid storage tank 2 on the flue gas from top to bottom; the spray structure includes a plurality of spray pipes 23 fixed in the denitration tank 1, and a plurality of spray heads 24 are provided at the bottom of the plurality of spray pipes 23. A transfer box 22 is fixed on one side of the denitration tank 1, and the transfer box 22 is connected with the plurality of spray pipes 23 through a plurality of connecting pipes. A water pump 21 is fixed on one side of the liquid storage tank 2 through a frame, and the liquid inlet end of the water pump 21 is connected with the liquid storage tank 2 through a hose, and the liquid outlet end of the water pump 21 is connected with the transfer box 22 through a hose; the reducing agent solution in the first cavity 40 is pumped into the spray pipe 23 through the water pump 21, and the flue gas is sprayed downward through the spray head 24 to denitrate the flue gas.

[0052] Reference Figure 2 A plurality of reflux holes 38 are provided on the inner wall at the bottom of the denitrification tank 1, and the liquid storage tank 2 is connected to the denitrification tank 1 through the reflux holes 38. An L-shaped partition 39 is fixed in the liquid storage tank 2, and the liquid storage tank 2 forms a first cavity 40 and a second cavity 41 through the L-shaped partition 39. A filter 42 is fixed in the L-shaped partition 39 for filtering the liquid entering the first cavity 40 from the second cavity 41. The hose at the liquid inlet end of the water pump 21 is connected to the first cavity 40; the second cavity 41 recovers the reducing agent solution in the flue 6, and the filter 42 filters the impurities in the reducing agent solution to prevent the impurities from clogging the spray head 24 in the later stage.

[0053] Example 2

[0054] refer to Figure 8 , improved on the basis of Example 1: a drying box 45 is fixed on the top of the denitrification box 1, a copper plate 46 is fixed in the drying box 45, a plurality of graphite rods 47 are fixed at the bottom of the copper plate 46, the bottom ends of the plurality of graphite rods 47 are fixedly extended into the flue 6, the copper plate 46 and the drying box 45 are used to recycle the waste heat of the flue gas in the flue 6; the waste heat in the flue gas is conducted to the copper plate 46 through the graphite rods 47, the copper plate 46 starts to heat up, and can increase the temperature in the drying box 45, thereby being able to dry the materials commonly used in the cement production process, thereby improving the utilization rate of energy and playing a role in energy saving and emission reduction.

[0055] A denitrification method for a solid waste cement flue gas zone adaptive denitrification system comprises the following steps:

[0056] S1. Inject the flue gas to be denitrated into the denitration box 1 through the main smoke pipe 10. When the flue gas is high-temperature gas, open the first solenoid valve 19 on the first smoke pipe 12, and close the first solenoid valve 19 on the second smoke pipe 14. The high-temperature flue gas enters the spiral heat exchange tube 13 through the first smoke pipe 12, and heat exchange is completed through the water in the first heat transfer bin 8. The flue gas is cooled to between 250°C and 400°C. The cooled flue gas enters the flue 6 to complete the spray denitration operation;

[0057] S2. When the flue gas is at an appropriate temperature, the threaded rod 18 drives the push plate 16 to move, and the push plate 16 pushes the liquid in the second heat transfer chamber 9 into the first heat transfer chamber 8 through the connecting hole 15. At this time, the first solenoid valve 19 on the second smoke pipe 14 is opened, and the first solenoid valve 19 on the first smoke pipe 12 is closed. The flue gas enters the flue 6 through the second smoke pipe 14, ensuring that the flue gas is maintained between 250°C and 400°C.

[0058] S3. When the injected flue gas is low-temperature gas, the driving motor 17 drives the push plate 16 to rotate, and the push plate 16 moves toward the denitration box 1. The heat-exchanged liquid in the first heat transfer chamber 8 enters the second heat transfer chamber 9 through the connecting hole 15. At this time, the first solenoid valve 19 on the second smoke pipe 14 is opened, and the first solenoid valve 19 on the first smoke pipe 12 is closed. When the flue gas enters the second heat transfer chamber 9 through the second smoke pipe 14, heat exchange is performed through the liquid in the second heat transfer chamber 9 to increase the temperature of the low-temperature flue gas to between 250°C and 400°C. Then, the flue gas is sprayed and denitrated in the flue 6;

[0059] S4, when the flue gas enters the flue 6, the reducing agent solution in the first cavity 40 is pumped into the spray pipe 23 through the water pump 21, and the flue gas is sprayed downward through the spray head 24 to denitrate the flue gas. Then the flue gas gathers above the sliding plate 26. The flue gas is blocked by the sliding plate 26 and cannot move along the flue 6, which increases the time for the flue gas to be sprayed, so that the flue gas and the reducing agent solution are fully contacted. As the flue gas above the sliding plate 26 gathers, the flue gas pushes the sliding plate 26 downward, and the spring 27 begins to compress. When the sliding plate 26 squeezes the pressure sensor 31, the pressure sensor 31 transmits a signal to the control center 43, and the control center 43 controls the second solenoid valve 29 to open. At this time, the flue gas above the sliding plate 26 and the reducing agent solution on the sliding plate 26 flow downward through the spiral tube 28, further increasing the contact time and contact area between the flue gas and the reducing agent solution, and fully denitrifying the flue gas. Then, under the action of the time relay 44, the second solenoid valve 29 is controlled to be closed after a certain period of time to seal the subsequent flue gas.

[0060] S5. When the flue gas passes through the flue 6 for spraying, the flue 6 increases the time for the flue gas to be sprayed, and the sieve plate 25 can adsorb and filter impurities in the flue gas during the spraying process. In addition, when the sliding plate 26 moves up and down, the sliding plate 26 drives the rotating shaft 34 to rotate through the cooperation of the rack 36 and the gear 35, and then the double cam 37 can knock the sieve plate 25 to shake off the impurities adsorbed on the sieve plate 25, so as to avoid the sieve plate 25 being blocked, and the impurities flow into the second cavity 41 along with the reducing agent solution, and the filter screen 42 filters the reducing agent solution, which is convenient for continued use in the later stage, thereby improving the utilization rate of the reducing agent solution;

[0061] S6. When the flue gas is sprayed and denitrated in the flue 6, the residual heat in the flue gas is transmitted to the copper plate 46 through the graphite rod 47. The copper plate 46 starts to heat up and can increase the temperature in the drying box 45, thereby drying the materials commonly used in the cement production process, improving the utilization rate of energy, and playing a role in energy saving and emission reduction.

[0062] However, as is well known to those skilled in the art, the working principles and wiring methods of the second solenoid valve 29, pressure sensor 31, water pump 21, drive motor 17, first solenoid valve 19, control center 43 and time relay 44 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any optional selections according to their needs or convenience.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A solid waste cement flue gas zone adaptive denitrification system, characterized in that: The denitrification box (1) comprises a plurality of upper baffles (4) fixed from left to right on the top inner wall of the denitrification box (1), a plurality of lower baffles (5) fixed from left to right on the bottom inner wall of the denitrification box (1), and the plurality of upper baffles (4) and the plurality of lower baffles (5) are arranged in a staggered manner, and the denitrification box (1) and the plurality of upper baffles (4) and the plurality of lower baffles (5) form a flue (6) for increasing the time for which the flue gas is sprayed in the denitrification box (1); A heat conversion box (3) is arranged on one side of the denitration box (1) and is used to control the temperature of the flue gas to be denitrated, a support plate (20) is fixed on one side of the denitration box (1), the heat conversion box (3) is fixed on the top of the support plate (20), and the support plate (20) is used to support the heat conversion box (3); A liquid storage tank (2), which is fixed to the bottom of the denitration tank (1) and is used to store a reducing agent solution; A smoke exhaust pipe (7), which is arranged on a side of the denitration box (1) away from the heat conversion box (3) and is used to discharge the smoke after denitration; A temperature control structure is arranged in the heat conversion box (3) and is used to control the temperature of the flue gas to be denitrated, so as to facilitate stable denitration operations in the later stage; A full denitration structure is arranged in the denitration box (1) and is used to fully allow the flue gas to react with the reducing agent solution; A spray structure, arranged in the denitration tank (1), for spraying the reducing agent solution in the liquid storage tank (2) onto the flue gas from top to bottom; The temperature control structure comprises a first heat transfer chamber (8) and a second heat transfer chamber (9) which are arranged in a heat conversion box (3), and the first heat transfer chamber (8) is located above the second heat transfer chamber (9). The first heat transfer chamber (8) contains a heat conversion liquid. A connecting hole (15) is provided in the heat conversion box (3), and the first heat transfer chamber (8) and the second heat transfer chamber (9) are connected through the connecting hole (15). A main smoke pipe (10) is provided on one side of the heat conversion box (3), and a three-way valve (11) is fixed to one end of the main smoke pipe (10). A first smoke pipe (12) and a second smoke pipe (14) are fixed to the top and bottom of the three-way valve (11), respectively, and the first smoke pipe (12) and the second smoke pipe (14) are used for the flow of high-temperature smoke and low-temperature smoke, respectively. One end of the first smoke pipe (12) extends into the first heat transfer chamber (8) and is fixed with a spiral heat exchange tube (13). The spiral heat exchange tube (13) cooperates with the liquid in the first heat transfer chamber (8) to perform heat exchange on the smoke. One end of the spiral heat exchange tube (13) is fixed and extends into the denitration box (1); The temperature control structure further comprises a push plate (16) which is sealingly and slidably connected to the second heat transfer chamber (9), the push plate (16) being used to control the discharge and injection of liquid in the second heat transfer chamber (9), a threaded rod (18) being rotatably connected to the second heat transfer chamber (9), and one end of the threaded rod (18) threadably penetrates the push plate (16), a drive motor (17) is fixed to one side of the heat conversion box (3) through a frame, and an output shaft of the drive motor (17) is fixedly connected to the threaded rod (18) through a coupling, one end of the second smoke pipe (14) is fixedly penetrated through the second heat transfer chamber (9) and extends into the denitration box (1), one end of the second heat transfer chamber (9) slides through the push plate (16), and the outer walls of the first smoke pipe (12) and the second smoke pipe (14) are both provided with a first solenoid valve (19); The fully denitrifying structure comprises a sliding plate (26) sealed and slidably connected in the flue (6), and one side of the sliding plate (26) is slidably connected to the upper baffle (4) on the far left, and the sliding plate (26) is located below the first smoke pipe (12) and the second smoke pipe (14), a plurality of first protrusions (32) are fixed to the inner wall of one side of the flue (6), a plurality of second protrusions (33) are fixed to one side of the upper baffle (4) on the far left, and springs (27) are fixed to the tops of the plurality of first protrusions (32) and the second protrusions (33), and the top of the spring (27) is fixedly connected to the bottom of the sliding plate (26); The fully denitrification structure further comprises a plurality of spiral tubes (28) fixedly penetrating the sliding plate (26) for making the flue gas fully contact with the reducing agent solution, a second solenoid valve (29) is provided at the bottom of each of the plurality of spiral tubes (28), a support rod (30) is fixedly provided on one side of one of the second protrusions (33), a pressure sensor (31) is fixedly provided on the top of the support rod (30), and the pressure sensor (31) cooperates with the sliding plate (26), a control center (43) and a time relay (44) are fixedly provided on one side of the denitrification box (1), and the control center (43) is electrically connected to the time relay (44) and the second solenoid valve (29); A plurality of sieve plates (25) are fixed in the flue (6) for filtering impurities in the flue gas, and the sieve plates (25) are located between two adjacent upper baffles (4) and lower baffles (5). A rotating shaft (34) is connected in a transversely rotatable manner in the flue (6), one end of the rotating shaft (34) rotatably passes through the plurality of upper baffles (4) and lower baffles (5) and is fixed with a gear (35). A plurality of double cams (37) are fixedly sleeved on the outer wall of the rotating shaft (34), and the double cams (37) cooperate with the sieve plates (25) to shake off impurities on the sieve plates (25). A rack (36) meshing with the gear (35) is fixed on the top of the sliding plate (26), and the rack (36) is slidably connected to the adjacent upper baffles (4).

2. According to claim 1, a solid waste cement flue gas zone adaptive denitrification system is characterized in that: The spray structure comprises a plurality of spray pipes (23) fixed in a denitration tank (1), a plurality of spray heads (24) being provided at the bottom of each of the plurality of spray pipes (23), a transfer box (22) being fixed on one side of the denitration tank (1), and the transfer box (22) being connected to the plurality of spray pipes (23) via a plurality of connecting pipes, a water pump (21) being fixed on one side of the liquid storage tank (2) via a frame, a liquid inlet end of the water pump (21) being connected to the liquid storage tank (2) via a hose, and a liquid outlet end of the water pump (21) being connected to the transfer box (22) via a hose.

3. A solid waste cement flue gas zone adaptive denitrification system according to claim 2, characterized in that: The bottom inner wall of the denitration tank (1) is provided with a plurality of reflux holes (38), and the liquid storage tank (2) and the denitration tank (1) are connected via the reflux holes (38). An L-shaped partition (39) is fixed inside the liquid storage tank (2), and the liquid storage tank (2) is formed with a first cavity (40) and a second cavity (41) via the L-shaped partition (39). A filter screen (42) is fixed inside the L-shaped partition (39) for filtering liquid entering the first cavity (40) from the second cavity (41), and a hose at a liquid inlet end of the water pump (21) is connected to the first cavity (40).

4. A solid waste cement flue gas zone adaptive denitrification system according to claim 3, characterized in that: A drying box (45) is fixed on the top of the denitration box (1), a copper plate (46) is fixed in the drying box (45), a plurality of graphite rods (47) are fixed at the bottom of the copper plate (46), the bottom ends of the plurality of graphite rods (47) are fixedly extended into the flue (6), and the copper plate (46) and the drying box (45) are used to recycle the waste heat of the flue gas in the flue (6).

5. A denitrification method using the solid waste cement flue gas zone adaptive denitrification system as claimed in claim 4, characterized in that: The following steps are involved: S1. First, different treatment methods are adopted for flue gas of different temperatures. The high-temperature flue gas enters the spiral heat exchange tube (13) through the smoke pipe, and is subjected to heat exchange with water to reduce the temperature to between 250°C and 400°C. The flue gas then enters the flue (6) for spraying and denitrification. When the flue gas temperature is moderate, the flow of liquid in the first heat transfer chamber (8) is adjusted to maintain the temperature of the flue gas. For low-temperature flue gas, the liquid in the first heat transfer chamber (8) is used to heat the flue gas to raise its temperature to the denitrification range. S2. Secondly, when the flue gas enters the flue (6), the reducing agent solution is sprayed through the spray system to denitrate the flue gas. The designed sliding plate (26) structure not only increases the contact time between the flue gas and the reducing agent solution, but also triggers the valve to open through its movement, so that the flue gas and the solution are further mixed in the spiral tube (28); S3. At the same time, the sieve plate (25) provided in the flue (6) can effectively filter impurities in the flue gas, and the movement of the sliding plate (26) knocks the sieve plate (25) through the mechanical structure to prevent the sieve plate from being blocked. The filtered impurities flow into the collection chamber along with the solution, and after being filtered by the filter screen (42), the reducing agent solution is recycled; S4. Finally, the residual heat in the flue gas is utilized and conducted to the drying box (45) through the heat conducting material to dry the materials in cement production.

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