Cyanuric acid production pyrolysis system

Abstract

The present invention discloses a pyrolysis system for cyanuric acid production, which relates to the technical field of cyanuric acid production equipment, including a loading station provided with a loading mechanism, a pyrolysis furnace and a discharging station of a pyrolysis station, wherein the loading station and the discharging station are arranged on the side of the pyrolysis furnace; a plurality of material basins are placed on a stand and can be moved between the loading station, the pyrolysis furnace and the discharging station; the pyrolysis furnace comprises a furnace body and a heating component arranged on the inner wall of the furnace body and connected to the superheated steam pipe of a power plant. Liquid urea is injected into the material basin on the stand through the loading mechanism, and after loading, the material enters the pyrolysis furnace for heating and pyrolysis, and after pyrolysis, the material enters the discharging station from the pyrolysis furnace for discharging; the inner wall of the pyrolysis furnace is provided with a heating component connected to the superheated steam of the power plant, and the superheated steam temperature of the power plant is about 300°C, which is much lower than the ignition point of ammonia, ensuring production safety; the loading mechanism can complete the loading of multiple material basins at one time, thereby improving the loading efficiency and reducing the labor intensity of the staff.

Description

Technical Field

[0001] The invention relates to the technical field of cyanuric acid production equipment, and in particular to a cyanuric acid production pyrolysis system. Background Art

[0002] Cyanuric acid is a white crystal with no odor and a slightly bitter taste. It is mainly used to synthesize chlorinated derivatives, trichloroisocyanuric acid, sodium or potassium dichloroisocyanurate. It can also be used to prepare cyanuric acid-formaldehyde resin, epoxy resin, antioxidant, coating, adhesive, pesticide herbicide, metal cyanide corrosion inhibitor, polymer material modifier, etc. It has a wide range of uses and is an important chemical reagent, raw material for organic synthesis and drug synthesis.

[0003] At present, the industrial production process of cyanuric acid is to heat urea as a raw material, and then pyrolyze and condense urea to produce cyanuric acid. In the prior art, when urea is used as the raw material for the production of cyanuric acid, the operator needs to put the urea into a pyrolysis furnace to heat it up, and then take it out of the pyrolysis furnace after the pyrolysis is completed. During this operation, the labor intensity of the operator is high and the cost is high; the waste gaseous ammonia and waste liquid generated during the pyrolysis process will also seriously affect the health of the operator, and the production environment of the workers is poor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a cyanuric acid production pyrolysis system in view of the deficiencies of the above-mentioned prior art, which can effectively improve the mechanization degree of the equipment, reduce the labor intensity of the staff, and ensure the health of the staff.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A pyrolysis system for producing cyanuric acid comprises a loading station, a pyrolysis station and a discharging station, wherein the loading station is provided with a loading mechanism, the pyrolysis station is provided with a pyrolysis furnace, and the loading station and the discharging station are arranged on the side of the pyrolysis furnace; the system also comprises a stand movable between the loading station, the pyrolysis furnace and the discharging station, wherein a plurality of material basins for containing liquid urea are arranged in parallel on the stand; the pyrolysis furnace comprises a furnace body and a heating component arranged on the inner wall of the furnace body, wherein the heating component is connected to a superheated steam pipe of a power plant and is used for heating the liquid urea in the material basin.

[0007] Preferably, the feeding mechanism includes a material tank, a lower hopper and several lower feeding pipes, the lower hopper is arranged below the material tank, the bottom of the material tank is connected to the lower hopper through a discharge pipe, the lower feeding pipes are arranged at intervals at the bottom of the lower hopper, and the discharge ports of the lower feeding pipes can correspond to several material basin inlets.

[0008] Preferably, the end of the discharge pipe is covered with a telescopic tube, and the plurality of telescopic tubes are connected to a lifting frame, the lifting frame is connected to a lifting rod, and the lifting rod is driven by a lifting mechanism.

[0009] Preferably, a first track is provided in the pyrolysis furnace, a first guide rail is provided on the inlet side of the pyrolysis furnace, a second guide rail extending to the unloading station is provided on the outlet side, a trolley is provided on the first guide rail and the second guide rail, a second track is provided on the trolley, and a third track is provided at the loading station; the first guide rail and the second guide rail are parallel to each other and perpendicular to the first track, the second track and the third track, and the third track is arranged between the first guide rail and the second guide rail at both ends of the inlet and outlet of the pyrolysis furnace; the bottom of the stand is provided with rollers that can cooperate with the first track, the second track and the third track.

[0010] Preferably, a first pushing mechanism for pushing the platform is provided at the inlet end of the first track, and the first pushing mechanism is arranged on the outside of the first guide rail; a second pushing mechanism is provided at the starting ends of the first guide rail and the second guide rail; a third pushing mechanism is provided at the inlet end of the third track and on the outside of the second guide rail.

[0011] Preferably, the first pushing mechanism includes a hydraulic cylinder and a bracket, the cylinder body of the hydraulic cylinder is arranged on the bracket, the end of the piston rod of the hydraulic cylinder is connected to the guide rod, the guide rod is parallel to the central axis of the piston rod, the guide rod is arranged above the cylinder body of the hydraulic cylinder, and a supporting guide block is provided on the top of the cylinder body of the hydraulic cylinder for guiding and limiting the guide rod; the structures of the second pushing mechanism and the third pushing mechanism are the same as the structure of the first pushing mechanism.

[0012] Preferably, a pulley is provided at the bottom of the trolley for cooperating with the first guide rail and the second guide rail.

[0013] Preferably, the terminals of the first guide rail and the second guide rail are both provided with limit blocks, and the limit blocks and the second pushing mechanism are arranged at the two ends of the first guide rail and the second guide rail opposite to each other.

[0014] Preferably, the heating assembly is formed by laying out a plurality of steam coils connected to the superheated steam pipe of the power plant, the steam coils are laid on the inner wall of the furnace body, and the first track is arranged at the bottom of the furnace body; there are a plurality of steam coils, and all are connected in parallel with the superheated steam pipe of the power plant, and a valve is arranged on the superheated steam pipe of the power plant; the side walls of the furnace body are respectively a heat reflecting layer, a heat insulating layer and a heat preserving layer from the inside to the outside.

[0015] Preferably, an ammonia discharge pipe is provided on the top of the furnace body, and the ammonia discharge pipe is connected to the lower part of the ammonia washing tower. An exhaust port and a urea inlet for communicating with a liquid urea pipe are provided on the top of the ammonia washing tower. A plurality of sieve plates for dispersing ammonia and liquid urea are provided on the upper part of the ammonia washing tower; the bottom of the ammonia washing tower is connected to a urea tank through a urea pipe, and the urea tank is connected to the top of the ammonia washing tower through a circulating pump.

[0016] Preferably, several material basins are arranged in two layers on the stand, and the upper material basins and the lower material basins are arranged in rows and columns in an alternating manner, and the number of rows of the upper material basins is less than that of the lower material basins; the material basins are conical basins with open upper ends; and guardrails are provided on the sides of the stand to limit the material basins.

[0017] The beneficial effects of the above technical scheme are as follows: Compared with the prior art, the present invention has the advantages of simple and compact structure and convenient and fast operation. Liquid urea is injected into several material basins on the stand at the loading station through the feeding mechanism. The stand moves between the feeding station, the pyrolysis furnace and the unloading station. After loading, the material enters the pyrolysis furnace for heating and pyrolysis. After the pyrolysis is completed, the material enters the unloading station from the pyrolysis furnace for unloading. The inner wall of the furnace body of the pyrolysis furnace is provided with a heating component connected to the superheated steam of the power plant, which is used to heat the liquid urea in the material basin. Since the superheated steam temperature of the power plant is about 300°C, which is far lower than the ignition point of ammonia, the explosion of ammonia is effectively avoided, ensuring the safety and reliability of the pyrolysis process. The feeding mechanism can complete the feeding of multiple material basins at one time, which improves the feeding efficiency. The use of the present invention can reduce the labor intensity of the staff, greatly reduce the safety hazards, and also achieve the purpose of energy saving and consumption reduction. The present invention is also applicable to the production and preparation of dichloroisocyanuric acid, sodium dichloroisocyanurate and trichloroisocyanuric acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a process of a cyanuric acid production pyrolysis system provided by an embodiment of the present invention;

[0019] Figure 2 It is a state diagram of the stage being placed on the first guide rail in the present invention;

[0020] Figure 3 It is a structural schematic diagram of the first pushing mechanism in the present invention;

[0021] Figure 4 It is a schematic diagram of the feeding process of the feeding mechanism;

[0022] Figure 5 It is a structural schematic diagram of a feeding pipe in a feeding mechanism of the present invention;

[0023] Figure 6 yes Figure 4 AA section view in;

[0024] Figure 7 This is a state diagram of the stand in the pyrolysis furnace of the present invention;

[0025] Figure 8 Figure 1 A top view of the interior of the pyrolysis furnace;

[0026] Fig. 9 yes Figure 7 Layout of the steam coil at the bottom of the medium pyrolysis furnace;

[0027] Fig.10 is a flow chart of washing ammonia in the present invention;

[0028] In the figure: 01-loading station, 02-pyrolysis station, 03-unloading station; 1-pyrolysis furnace, 101-furnace body, 1011-heat reflection layer, 1012-insulation layer, 1013-heat preservation layer, 102-steam coil;

[0029] 2-stand, 3-material basin, 4-material tank, 5-lower hopper, 6-lowering pipe, 7-discharging pipe, 8-material distribution pipe, 9-telescopic pipe, 10-lifting rod; 11-first track, 12-second track, 13-third track, 14-first guide rail, 15-second guide rail, 16-trolley, 17-roller, 18-first pushing mechanism, 180-hydraulic cylinder, 181-bracket; 19-second pushing mechanism, 20-third pushing mechanism, 21 -cooling pipe, 22-guide rod, 23-support guide block, 24-pulley, 25-limiting block, 26-ammonia discharge pipe, 27-ammonia washing tower, 28-liquid urea pipe, 29-sieve plate, 30-urea tank, 31-circulating pump, 32-heat exchanger, 33-return block, 34-ammonia pipeline, 35-coolant inlet pipe, 36-coolant outlet pipe, 37-liquid level meter, 38-thermometer, 39-guardrail; 40-lifting frame, 41-branch pipe. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] like Figure 1 , 2 The present invention shown in the figure provides a cyanuric acid production pyrolysis system, which includes a loading station 01, a pyrolysis station 02 and a unloading station 03, wherein the loading station 01 is provided with a loading mechanism, the pyrolysis station 02 is provided with a pyrolysis furnace 1, and the loading station 01 and the unloading station 03 are arranged on the side of the pyrolysis furnace 1; it also includes a stand 2 that can be moved between the loading station 01, the pyrolysis furnace 1 and the unloading station 03, and a plurality of material basins 3 for containing liquid urea are arranged in parallel on the stand 2.

[0032] As a preferred structure, Figure 4 As shown, the feeding mechanism includes a material tank 4, a lower hopper 5 and several lower feeding pipes 6. The lower hopper 5 is arranged below the material tank 4. The bottom of the material tank 4 is connected to the lower hopper 5 through a discharge pipe 7. The lower feeding pipes 6 are arranged at intervals at the bottom of the lower hopper 5. The discharge port of the lower feeding pipe 6 can correspond to the inlet of several material basins 3. The liquid urea in the material tank first enters the lower hopper for buffering, and then is injected into each material basin one by one through the lower feeding pipe, so that several material basins can be fed at the same time, and the operation is convenient and fast. In addition, a control valve can be installed at the inlet end of the lower feeding pipe to facilitate the simultaneous feeding of multiple material basins.

[0033] The lower hopper 5 is provided with a distribution pipe 8, the top of which is connected to the discharge pipe 7, and the lower surface of the distribution pipe 8 is provided with a plurality of discharge holes. The distribution pipe 8 is a serpentine coil, the inlet end of which is arranged in the middle, the shape of the lower hopper 5 matches the shape of the stand 2; the material tank 4 is arranged above the lower hopper 5. The adoption of this technical solution enables the liquid urea to be uniformly injected into the lower hopper. When the amount of liquid urea in the lower hopper reaches the one-time feeding amount of multiple material basins, the control valve on the lower pipe can be opened to feed multiple material basins at the same time.

[0034] In a specific embodiment of the present invention, Figure 5 As shown, the end of the discharge pipe 6 is covered with a telescopic pipe 9, and the plurality of telescopic pipes 9 are connected to a lifting frame 40, and the lifting frame is connected to a lifting rod 10, and the lifting rod 10 is driven by a lifting mechanism. The lifting mechanism can be a hydraulic cylinder, a worm gear mechanism or a screw transmission mechanism (not shown in the figure), and the lifting mechanism is used to realize the simultaneous lifting of the telescopic pipes, thereby facilitating the withdrawal of the platform from the loading station and preventing the discharge pipe from interfering with the movement of the material basin.

[0035] In order to facilitate the realization of automatic control, the valves on the discharge pipe and the discharge pipe are all solenoid valves, which are electrically connected to the control console in the control room. The staff can operate the loading operation of the material basin in the control room, without the need for the staff to load the material on site, so as to avoid the irritating smell of liquid urea affecting the health of the staff.

[0036] like Figure 6 As shown, several material basins 3 are arranged in two layers on the stand 2, and the upper material basin and the lower material basin are arranged in rows and columns in an interlaced manner, and the number of rows and columns of the upper material basin is less than that of the lower material basin; the material basin 3 is a conical basin with an open top. Among them, the material basin 3 is a transparent glass basin, which is convenient for observing the reaction of the liquid urea in the material basin. With this arrangement, it is possible to load several material basins at the same time, and enter the pyrolysis furnace after loading. This arrangement also facilitates the heat absorption of the liquid urea in the material basin.

[0037] Further optimize the above technical solution, such as Figure 6 As shown, a guardrail 39 is provided on the side of the stand 2 to limit the position of the material basin to prevent the material basin from sliding off the stand during movement.

[0038] In a preferred embodiment of the present invention, Figure 1 As shown, a first track 11 is provided in the pyrolysis furnace 1, a first guide rail 14 is provided on the inlet side of the pyrolysis furnace 1, and a second guide rail 15 extending to the unloading station 03 is provided on the outlet side, a trolley 16 is provided on the first guide rail 14 and the second guide rail 15, and a second track 12 is provided on the trolley 16, and a third track 13 is provided on the loading station 01; the first guide rail 14 and the second guide rail 15 are parallel to each other and perpendicular to the first track 11, the second track 12 and the third track 13, and the third track 13 is arranged between the first guide rail 14 and the second guide rail 15 at both ends of the inlet and outlet of the pyrolysis furnace 1; the bottom of the stand 2 is provided with a roller 17 that can cooperate with the first track 11, the second track 12 and the third track 13, which can reduce the resistance encountered by the stand during movement. Among them, a first pushing mechanism 18 for pushing the platform 2 is provided at the inlet end of the first track 11, and the first pushing mechanism 18 is arranged on the outer side of the first guide rail 14; a second pushing mechanism 19 is provided at the starting end of the first guide rail 14 and the second guide rail 15; a third pushing mechanism 20 is provided at the inlet end of the third track 13 and the outer side of the second guide rail 15.

[0039] Figure 1 The arrow in the figure indicates the moving direction of the rack. When several material basins on the rack are injected with liquid urea at the loading station, the rack is pushed to the trolley on the first guide rail by the third pushing mechanism, and the trolley is pushed to the inlet end of the pyrolysis furnace along the first guide rail by the second pushing mechanism, and then the rack is pushed from the trolley to the first track in the pyrolysis furnace by the first pushing mechanism; after the urea is pyrolyzed to generate cyanuric acid in the pyrolysis furnace, the first pushing mechanism pushes the rack with the next batch of urea into the pyrolysis furnace, and then pushes the rack that has completed pyrolysis in the pyrolysis furnace out of the pyrolysis furnace and moves it to the trolley on the second guide rail, and then uses the second pushing mechanism at the end of the second guide rail to move the rack along the second track on the trolley to the unloading station to start unloading. The use of this structure eliminates the need for operators to enter and exit the pyrolysis furnace, thus avoiding harm from ammonia gas, while also improving work efficiency and reducing labor intensity.

[0040] like Figure 3As shown, the first push mechanism 18 includes a hydraulic cylinder 180 and a bracket 181, the cylinder body of the hydraulic cylinder is arranged on the bracket 181, the end of the piston rod of the hydraulic cylinder 180 is connected to the guide rod 22, the guide rod 22 is parallel to the central axis of the piston rod, and the guide rod 22 is arranged above the cylinder body of the hydraulic cylinder 180. The top of the cylinder body of the hydraulic cylinder 180 is provided with a support guide block 23 for limiting the guide rod 22; the structure of the second push mechanism 19 and the third push mechanism 20 is the same as that of the first push mechanism 18. With the help of the bracket, the hydraulic cylinders of the first push mechanism and the third push mechanism can be made equal in height to the platform, and the hydraulic cylinder of the second push mechanism can be made equal in height to the trolley, so that the hydraulic cylinder of the second push mechanism can push the trolley to move along the first guide rail and the second guide rail, and the hydraulic cylinder of the first push mechanism and the third push mechanism can push the platform to move along the first track and the third track. Among them, the guide rod can further enhance the guidance of the piston rod, ensure the strength of the piston rod, and ensure the safe operation of the hydraulic cylinder.

[0041] like Figure 2 As shown, a pulley 24 is provided at the bottom of the trolley 16 for cooperating with the first guide rail 14 and the second guide rail 15. This structure can reduce the resistance of the trolley during movement.

[0042] After the material basin is loaded at the loading station, it is pushed onto the trolley on the first guide rail by the action of the third pushing mechanism, and then the trolley is pushed along the first guide rail to the inlet end of the pyrolysis furnace by the second pushing mechanism, and then the rack is pushed from the trolley to the first track in the pyrolysis furnace by the first pushing mechanism; after urea is pyrolyzed to generate cyanuric acid in the pyrolysis furnace, the first pushing mechanism pushes the rack containing the next batch of urea into the pyrolysis furnace, and then pushes the rack that has completed pyrolysis in the pyrolysis furnace out of the pyrolysis furnace and moves it to the trolley on the second guide rail, and then uses the second pushing mechanism at the end of the second guide rail to move the rack along the second track on the trolley to the unloading station to start unloading.

[0043] like Figure 1 As shown, the first guide rail 14 and the second guide rail 15 are both provided with a stopper 25 at their ends, and the stopper 25 and the second push mechanism 19 are arranged at both ends of the first guide rail 14 and the second guide rail 15. With the help of the stopper, the trolley can be prevented from leaving the first guide rail and the second guide rail.

[0044] like Figure 7-9As shown, the pyrolysis furnace 1 includes a furnace body 101 and a heating component arranged on the inner wall of the furnace body 101. The heating component is formed by laying a plurality of steam coils 102 connected to the superheated steam pipe of the power plant. The steam coils 102 are laid on the inner wall of the furnace body 101. The first track 11 is arranged at the bottom of the furnace body 101. The steam coils 102 are a plurality of steam coils 102, which are all connected in parallel with the superheated steam pipe of the power plant. The superheated steam pipe of the power plant is provided with a valve. The use of this structure can ensure that the temperature of each part of the furnace body is consistent, and the urea on the stand is evenly pyrolyzed. In view of the fact that the superheated steam temperature of the power plant is about 300°C, which is far lower than the ignition point of ammonia, it can effectively avoid the explosion of ammonia and reduce the potential safety hazards in the production process.

[0045] like Figure 7 As shown, the side wall of the furnace body 101 is composed of a heat reflection layer 1011, a heat insulation layer 1012 and a thermal insulation layer 1013 from the inside to the outside. The heat reflection layer is made of a high temperature resistant far infrared radiation coating, the material of the heat insulation layer is a fiberboard, a vacuum board or a composite silicate board, and the material of the thermal insulation layer is a rock wool board, a hollow brick or a foam board. The furnace body with this structure can avoid heat loss and ensure the required temperature for urea pyrolysis.

[0046] To further optimize the above technical solution, the inlet and outlet of the furnace body 101 are also provided with heat-insulating door panels (not shown in the figure), and the upper end of the heat-insulating door panels is connected to a lifting mechanism, which is arranged above the furnace body and is used to drive the heat-insulating door panels to rise and fall. The lifting mechanism is a hydraulic cylinder or electric push rod arranged outside the furnace body, and other lifting structures such as cylinders or motor screws can also be used to achieve the lifting of the heat-insulating door panels to avoid heat loss in the furnace body during the urea pyrolysis process. In order to further avoid heat loss, slide grooves that slide with the heat-insulating door panels are provided on both sides of the inlet and outlet of the furnace body 101, and sealing strips are provided on both sides of the heat-insulating door panels.

[0047] Figure 8 The furnace bodies 101 are arranged in parallel in three pieces, and the number of furnace bodies can also be adjusted according to actual conditions. This arrangement can increase the output and is suitable for mass production. The first track is set on the support frame, so that the track inside the furnace body and the track on the external trolley are at the same height, which is convenient for the track inside and outside the furnace body to be connected. After the urea in the material basin is pyrolyzed, the trolley can slide along the first track to the external trolley.

[0048] like Fig.10As shown, an ammonia discharge pipe 26 is provided at the top of the furnace body 101, and urea vapor in the ammonia is washed and recovered through a washing device. The ammonia washing device includes an ammonia washing tower 27, a urea tank 30 and a circulating pump 31. The ammonia discharge pipe 26 is connected to the lower part of the ammonia washing tower 27. The top of the ammonia washing tower 27 is provided with an exhaust port and a urea inlet for communicating with a liquid urea pipe 28. The upper part of the ammonia washing tower 27 is provided with a plurality of sieve plates 29 for dispersing ammonia and liquid urea; the bottom of the ammonia washing tower 27 is connected to the urea tank 30 through a urea pipe, and the urea tank 30 is connected to the top of the ammonia washing tower 27 through a circulating pump 31.

[0049] The sieve plate 29 is provided with a plurality of sieve holes, and the sieve holes on the upper and lower adjacent sieve plates 29 are arranged in a staggered manner. This structure enables the ammonia gas to rise in a curve, thereby allowing the ammonia gas to fully contact with the liquid urea, and allowing the urea vapor in the ammonia gas to fully dissolve in the liquid urea.

[0050] Further optimize the above technical solution, such as Fig.10 As shown, the discharge pipe of the urea tank 30 is connected to the heat exchanger 32 through the circulation pump 31, and the discharge port of the heat exchanger 32 is connected to the urea inlet of the ammonia washing tower 27; the cooling medium inlet and outlet of the heat exchanger 32 are connected to the cooling system. Since the ammonia gas discharged from the pyrolysis furnace has an extremely high temperature, the temperature of the liquid urea will increase after passing through the ammonia washing tower and converge into the urea tank. The liquid urea output by the circulation pump is cooled by the heat exchanger and then circulated to the ammonia washing tower for multiple cycles to absorb the urea vapor in the ammonia gas. In addition, the outlet of the circulation pump 31 is also provided with a branch pipe 41 connected to the production pipeline, and when the amount of liquid urea in the urea tank is too much, it is recycled and reused.

[0051] In a specific embodiment of the present invention, Fig.10 As shown, the exhaust port of the ammonia scrubbing tower 27 is connected to the air inlet of the side wall of the compound baffle 33 through an exhaust pipe, the top air outlet of the compound baffle 33 is connected to the ammonia pipeline 34, and the bottom discharge port of the compound baffle 33 is connected to the urea tank 30. The compound baffle can be used to remove dust from the ammonia scrubbing tower, and the dust-removed ammonia is discharged through the ammonia pipeline. At the same time, part of the liquid urea in the ammonia can be separated and converged to the urea tank.

[0052] Since the temperature of ammonia gas discharged from the pyrolysis furnace is extremely high, the above technical solution is further optimized, such as Fig.10As shown, a cooling pipe 21 connected to the cooling system is provided at the bottom of the urea tank 30. Among them, a cooling pipe 21 connected to the cooling system is provided at the bottom of the ammonia washing tower 27. The cooling pipes 21 in the ammonia washing tower 27 and the urea tank 30 are both serpentine coils, which can accelerate the cooling of liquid urea. The medium inlet and outlet of the heat exchanger, the two ends of the cooling pipes in the ammonia washing tower and the urea tank are respectively connected to the coolant inlet pipe 35 and the coolant outlet pipe 36 of the cooling system, which can timely cool down the ammonia gas and liquid urea, and avoid the temperature of the ammonia washing tower and the urea tank being too high, which poses a safety hazard. Among them, the coolant in the cooling system can be selected from cooling water.

[0053] like Fig.10 As shown, a liquid level gauge 37 and a thermometer 38 are provided in the urea tank 30, and a thermometer 38 is provided on the ammonia discharge pipe 26. This structure can monitor the temperature in the ammonia scrubbing tower and the urea tank at any time, and use the cooling system to cool it down to a safe value.

[0054] To further optimize the above technical solution, a spray pipe (not shown in the drawing) is provided at the top of the inner cavity of the ammonia scrubbing tower 27. The spray pipe passes through the urea inlet and is connected to the liquid urea pipe. The spray pipe is a coil, and a plurality of spray holes are provided on the lower surface of the spray pipe. This structure can evenly disperse the liquid urea, expand the contact area with the ammonia gas, and fully recover the urea vapor in the ammonia gas.

[0055] In summary, the present invention has the advantages of simple and compact structure, simple process and easy operation. After all the material basins are loaded at one time by the loading mechanism at the loading station, the rack is pushed to the trolley on the first guide rail under the action of the third pushing mechanism, and then the rack is pushed to the inlet end of the pyrolysis furnace under the action of the second pushing mechanism, and the rack is pushed into the pyrolysis furnace under the push of the first pushing mechanism; the liquid urea is pyrolyzed by the superheated steam of the power plant in the pyrolysis furnace, which can greatly reduce the reaction temperature and improve the production safety factor; after the liquid urea is pyrolyzed, the next batch of racks are used to push the previous batch of racks out of the pyrolysis furnace under the action of the first pushing mechanism, and moved to the trolley on the second guide rail, and the racks that have completed the pyrolysis are pushed to the unloading station for unloading under the action of the second pushing mechanism; the ammonia generated by the reaction in the pyrolysis furnace can be dissolved in the liquid urea after being washed by the ammonia washing tower, so as to realize the recovery and reuse of urea. The present invention can realize the automated production of cyanuric acid, use liquid urea as raw material, improve the feeding efficiency; use the superheated steam of the power plant as the heat source of pyrolysis, greatly reduce the reaction temperature, improve the production safety factor, adopt the cooperation of the trolley with the first guide rail and the second guide rail, and the cooperation of the stand with the first track, the second track and the third track, so as to easily realize the movement of the stand between various workstations, improve the work efficiency, reduce the labor intensity of the staff, and also ensure the health of the staff. The present invention is also applicable to the production and preparation of dichloroisocyanuric acid, sodium dichloroisocyanurate and trichloroisocyanuric acid.

[0056] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A pyrolysis system for producing cyanuric acid, characterized in that: The invention comprises a loading station, a pyrolysis station and an unloading station, wherein the loading station is provided with a loading mechanism, the pyrolysis station is provided with a pyrolysis furnace, and the loading station and the unloading station are arranged on the side of the pyrolysis furnace; the invention also comprises a stand which can be moved between the loading station, the pyrolysis furnace and the unloading station, and a plurality of material basins for containing liquid urea are arranged in parallel on the stand; the pyrolysis furnace comprises a furnace body and a heating component arranged on the inner wall of the furnace body, and the heating component is connected with the superheated steam pipe of the power plant and is used to heat the liquid urea in the material basin; the loading mechanism comprises a material tank, a lower A hopper and a plurality of discharge pipes, wherein the discharge hopper is arranged below the material tank, the bottom of the material tank is connected to the discharge hopper through a discharge pipe, the discharge pipes are arranged at intervals at the bottom of the discharge hopper, and the discharge ports of the discharge pipes can correspond to the inlets of a plurality of material basins; a first track is arranged in the pyrolysis furnace, a first guide rail is arranged on the inlet side of the pyrolysis furnace, and a second guide rail extending to the unloading station is arranged on the outlet side, a trolley is arranged on both the first guide rail and the second guide rail, a second track is arranged on the trolley, and a third track is arranged on the loading station; the first guide rail and The second guide rails are parallel to each other and perpendicular to the first rail, the second rail and the third rail. The third rail is arranged between the first guide rail and the second guide rail at both ends of the inlet and outlet of the pyrolysis furnace; the bottom of the gantry is provided with rollers capable of cooperating with the first rail, the second rail and the third rail; the bottom of the trolley is provided with pulleys for cooperating with the first guide rail and the second guide rail; the inlet end of the first rail is provided with a first pushing mechanism for pushing the gantry, and the first pushing mechanism is arranged on the outside of the first guide rail; the starting ends of the first guide rail and the second guide rail are both provided with a second pushing mechanism; the inlet end of the third rail and the outside of the second guide rail are provided with a third pushing mechanism; the first pushing mechanism includes a hydraulic cylinder and a bracket, the cylinder body of the hydraulic cylinder is arranged on the bracket, the end of the piston rod of the hydraulic cylinder is connected to a guide rod, the guide rod is parallel to the central axis of the piston rod, the guide rod is arranged above the cylinder body of the hydraulic cylinder, and the top of the cylinder body of the hydraulic cylinder is provided with a support guide block for guiding and limiting the guide rod; the structures of the second pushing mechanism and the third pushing mechanism are the same as those of the first pushing mechanism.

2. The pyrolysis system for producing cyanuric acid according to claim 1, characterized in that: The end of the discharge pipe is covered with a telescopic tube, and a plurality of telescopic tubes are connected to a lifting frame, and the lifting frame is connected to a lifting rod, and the lifting rod is driven by a lifting mechanism.

3. The pyrolysis system for producing cyanuric acid according to claim 1, characterized in that: The terminals of the first guide rail and the second guide rail are both provided with limit blocks, and the limit blocks and the second pushing mechanism are arranged at the two ends of the first guide rail and the second guide rail opposite to each other.

4. The pyrolysis system for producing cyanuric acid according to claim 1, characterized in that: The heating assembly is formed by laying out a plurality of steam coils connected to the superheated steam pipe of the power plant, the steam coils are laid on the inner wall of the furnace body, and the first track is arranged at the bottom of the furnace body; there are a plurality of steam coils, and all are connected in parallel with the superheated steam pipe of the power plant, and a valve is arranged on the superheated steam pipe of the power plant; the side walls of the furnace body are respectively a heat reflection layer, a heat insulation layer and a thermal insulation layer from the inside to the outside.

5. The pyrolysis system for producing cyanuric acid according to claim 1, characterized in that: An ammonia discharge pipe is provided on the top of the furnace body, and the ammonia discharge pipe is connected to the lower part of the ammonia washing tower. An exhaust port and a urea inlet for communicating with a liquid urea pipe are provided on the top of the ammonia washing tower. A plurality of sieve plates for dispersing ammonia gas and liquid urea are provided on the upper part of the ammonia washing tower; the bottom of the ammonia washing tower is connected to a urea tank through a urea pipe, and the urea tank is connected to the top of the ammonia washing tower through a circulating pump.

6. The pyrolysis system for producing cyanuric acid according to any one of claims 1 to 5, characterized in that: A plurality of material basins are arranged on a stand in two layers, the upper material basin and the lower material basin are arranged in rows and columns in an alternating manner, the number of rows of the upper material basin is less than that of the lower material basin; the material basin is a conical basin body with an open upper end; guardrails are provided on the sides of the stand for limiting the material basins.

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