Complete equipment for combined decoloration of cyanamide aqueous solution and use method of complete equipment

Abstract

The invention discloses complete equipment for combined decoloration of a cyanamide aqueous solution and a use method of the complete equipment. The equipment comprises a reaction kettle, a decolorizing agent storage tank, a finished product storage tank and a central controller. The reaction kettle is provided with a feeding pipe and a decolorizing agent adding device, and decolorizing agent feeding is accurately controlled through linkage of a color sensor and an electromagnetic metering pump. The stirring system optimizes material mixing and reaction by means of a torque sensor and a flow control valve. The filter assembly adopts a multi-layer filter screen for fine filtration, and a backwashing system prevents impurity pollution. The finished product storage tank is provided with a stirrer and a quality monitor, and a central controller is connected with all parts to realize automation. The using method comprises the steps of feeding, stirring, filtering, backwashing, storing, quality monitoring and the like, and production is adjusted or abnormity is processed according to a monitoring result. The decoloring effect can be effectively improved, the quality of a finished product is guaranteed, the production efficiency is improved, the method is widely applied to the field of cyanamide aqueous solution decoloring production, and the method has remarkable industrial application value and market prospect.

Description

Technical Field

[0001] The invention relates to the field of chemical equipment and process technology, and in particular to a complete set of equipment for combined decolorization of cyanamide aqueous solution and a use method thereof. Background Art

[0002] Cyanamide aqueous solution is widely used as a plant growth regulator in many fields, especially in agriculture. However, during the production or storage process, its color often changes due to various factors, such as impurities, oxidation of some substances or other chemical reactions, which makes the appearance color of cyanamide aqueous solution not meet market requirements or relevant quality standards. Traditional decolorization methods often have many defects and are difficult to meet the needs of modern industrial production for efficient, accurate and stable decolorization.

[0003] Some traditional decolorization processes may use a single adsorbent or chemical reagent for decolorization, but this method lacks flexibility and cannot be dynamically adjusted according to the actual color changes of cyanamide aqueous solution. For example, when the initial color of cyanamide aqueous solution in the raw material is dark or the color change is more complicated, a fixed dose of decolorizer may not achieve the ideal decolorization effect, resulting in the product color still exceeding the standard range, affecting product quality and sales.

[0004] In terms of material mixing, traditional stirring equipment can usually only provide fixed stirring modes and speeds, which are difficult to adapt to the dynamic changes in material viscosity and mixing state during the decolorization reaction. As the decolorization reaction proceeds, the properties of the material will change, and agglomerates may form or the viscosity may increase. At this time, if the stirring speed and mixing time cannot be adjusted accordingly, the decolorizer and the cyanamide aqueous solution will not be able to fully contact and react, resulting in incomplete reaction, which not only reduces the decolorization efficiency, but may also lead to waste of raw materials and increase production costs.

[0005] The filtration link is also a weak point in the traditional decolorization process. The traditional filter has a simple structure and limited filtration accuracy, and cannot effectively remove the tiny impurity particles in the cyanamide solution. Moreover, after long-term use, the filter is prone to clogging and requires frequent shutdown for cleaning or replacement of the filter screen, which not only affects production efficiency, but may also introduce new impurities due to improper manual operation, further affecting product quality. At the same time, the traditional process lacks an effective backwashing mechanism, or the backwashing process is prone to cause impurities to flow back, contaminating the treated materials or finished products.

[0006] In addition, the traditional decolorization production process often does not monitor the quality of the finished product in a timely and comprehensive manner. Sampling inspections are usually only carried out after the production is completed, and it is impossible to detect quality problems and make adjustments in real time during the production process. Once the sampling inspection finds that the quality of the finished product is unqualified, it may mean that the entire batch of products needs to be reworked or scrapped, causing huge economic losses. Moreover, after the quality problems are discovered in the traditional process, there is a lack of effective automated processing measures, and more adjustments are made by manual experience, which makes the adjustment process time-consuming and difficult to ensure the accuracy and consistency of the adjustments.

[0007] In summary, in order to overcome these defects in the traditional cyanamide aqueous solution decolorization process, there is an urgent need for a new set of cyanamide aqueous solution combined decolorization equipment and its use method that can achieve accurate decolorization, efficient mixing reaction, reliable filtration and impurity treatment, and comprehensive real-time quality monitoring and control, so as to meet the increasing industrial production needs and quality standards. Summary of the invention

[0008] The invention relates to a complete set of equipment for combined decolorization of cyanamide aqueous solution and a use method thereof, aiming to efficiently and accurately decolorize the cyanamide aqueous solution to obtain a product that meets quality standards.

[0009] The complete set of equipment mainly consists of a reactor, a decolorant storage tank, a finished product storage tank and a central controller. A decolorant feed pipe and a cyanamide aqueous solution feed pipe are provided on the top of the reactor, which are used to input the decolorant and cyanamide aqueous solution respectively. An electromagnetic metering pump is installed in the middle of the decolorant feed pipe, which can accurately control the amount of decolorant added. The rotating nozzle at the tail end can spray the decolorant evenly under the action of the drive shaft and related gears. The first motor at the center of the top of the reactor drives the drive shaft and the first stirring rod to stir the material. The torque sensor at the bottom of the stirring shaft monitors the stirring torque. The color sensor on the top inner wall monitors the color change of the material in real time. Based on the color change, the central controller can control the electromagnetic metering pump to adjust the amount of decolorant added.

[0010] The mixed liquid delivery pipe at the bottom of the reactor is connected to the filter assembly. A flow control valve is provided on the mixed liquid delivery pipe. The filter assembly includes a filter tank with multiple layers of stainless steel filter screens with different apertures inside, which can effectively filter impurities. The connecting pipe connecting the filter assembly and the finished product storage tank is provided with a first solenoid valve, a pressure sensor and a water pump. The pressure sensor monitors the filtration pressure. The water pump provides power during backwashing. During normal filtration, the liquid flows under the action of gravity. The first solenoid valve controls the liquid to flow to the finished product storage tank. A waste pipe is also provided near the filter assembly on the mixed liquid delivery pipe. The waste pipe is provided with a second solenoid valve and a collection tank for the discharge of impurities during backwashing.

[0011] The second motor at the end of the finished product storage tank drives the second stirring rod to gently stir the finished product to prevent precipitation and uneven ingredients. The finished product conveying pipe at the bottom of the finished product storage tank is connected to the packaging equipment, and its outer wall is installed with an online concentration analyzer, pH tester and colorimeter in turn to monitor the quality indicators of the finished product in real time. The central controller is connected to each electrical structure through wired or wireless communication, receives data information from each sensor, and controls and adjusts the operating status of each execution structure according to the preset program.

[0012] The method of use is as follows: First, in the feeding stage, the cyanamide aqueous solution and the decolorant enter the reactor according to the set path and mix evenly. In the mixing and stirring stage, the first stirring rod continues to stir. According to the feedback from the color sensor and the torque sensor, the central controller controls the amount of decolorant added and the opening of the flow control valve to ensure that the reaction is fully carried out. Then in the filtration stage, the mixed liquid is filtered through the filter assembly by gravity and flows into the finished product storage tank. During the process, the pressure sensor monitors the pressure and the first solenoid valve controls the flow direction. When backwashing is required, close the relevant valves, start the water pump for backwashing, and the impurities are discharged into the collection tank, and then the normal process is restored. Finally, in the finished product storage stage, the second stirring rod stirs the finished product, and the quality monitoring instrument monitors the indicators. If the indicators are qualified, they are transported to the packaging equipment. If they are not qualified, the central controller will issue an alarm and start the corresponding treatment measures, such as adjusting the production link parameters or adding regulators, so as to ensure the stable and qualified product quality and achieve efficient decolorization and quality control of cyanamide aqueous solution.

[0013] Beneficial effects of the present invention: 1. By setting up a linkage mechanism between a color sensor and an electromagnetic metering pump in the reactor, the color change of the material can be monitored in real time, and the amount of decolorizer added can be accurately increased in proportion to the color depth signal. This dynamic adjustment ensures that the decolorization reaction can proceed accurately toward the expected decolorization standard. No matter how the initial color state of the raw material cyanamide aqueous solution fluctuates, deep decolorization can be effectively achieved, significantly improving the appearance quality of the product, making it meet the market's strict requirements for the color of cyanamide aqueous solution, thereby enhancing the product's competitiveness in the market.

[0014] 2. The first motor in the reactor drives the stirring rod to perform stirring operations. At the same time, with the help of the coordinated work of the torque sensor and the flow control valve, intelligent perception and flow control of the material mixing state are realized. When the torque of the stirring shaft changes due to the material mixing situation, the flow control valve automatically adjusts the opening according to the preset torque-flow curve, effectively extending or shortening the residence time of the material in the reactor. This mechanism enables the decolorizer and the cyanamide aqueous solution to fully contact and react under the most suitable reaction conditions, avoiding the problem of incomplete decolorization caused by uneven mixing or insufficient reaction time, greatly improving the reaction conversion rate and decolorization efficiency, reducing the waste of raw materials, and reducing production costs. The rotating nozzle at the tail end of the decolorizer feeding pipe rotates evenly under the action of the drive shaft and gear transmission, and the decolorizer is evenly sprayed in the cyanamide aqueous solution in the reactor, further optimizing the initial mixing uniformity of the decolorizer and the cyanamide aqueous solution, laying a good foundation for the subsequent full reaction, and ensuring the efficient progress of the reaction from the initial stage of the reaction.

[0015] 3. The filter assembly adopts a stainless steel filter design with multiple layers of different pore sizes and the pore size decreases in sequence along the filtering direction, which can filter the impurities in the mixed liquid step by step and finely. This layered filtration method can effectively remove impurity particles of different particle sizes, ensure that the decolorized cyanamide aqueous solution entering the finished product storage tank has extremely high purity, meet the strict restrictions on the impurity content of high-quality products, improve the stability and reliability of the product, and extend the storage period of the product. The design of the backwashing system is ingenious. When the filter needs to be backwashed, the central controller automatically closes the flow control valve and the first solenoid valve, opens the second solenoid valve, and uses a special water pump to provide power to make the backwashing water pass through the filter in the opposite direction, thoroughly wash off the impurities attached to the filter, and discharge it into the collection tank through the waste pipe. This process can not only efficiently clean the filter and restore its filtering performance, but also effectively prevent the backwashing impurities from entering the reactor and the finished product storage tank, avoid contamination of the ongoing production process and the stored finished products, ensure the continuity and stability of the entire production process, reduce the downtime caused by equipment maintenance, and improve production efficiency.

[0016] 4. Online concentration analyzers, pH detectors and colorimeters are installed on the finished product delivery pipes of the finished product storage tanks. These high-precision quality monitoring instruments can monitor the key quality indicators of finished products in real time and comprehensively. The concentration ensures that the content of the active ingredients of the product meets the standards, the pH ensures the chemical stability and safety of the product, and the colorimetry verifies the durability of the decolorization effect. This multi-dimensional quality monitoring system provides a full range of guarantees for the quality of finished products, and any abnormality in any indicator can be discovered and handled in a timely manner.

[0017] 5. The central controller is closely connected to each electrical structure in the equipment (such as motors, pumps, solenoid valves, sensors, etc.) through wired or wireless communication, realizing highly automated control of the entire production process. The operator only needs to input the preset process parameters in the central controller, and the equipment can automatically complete a series of complex operation processes such as feeding, mixing, filtering, backwashing, finished product storage and quality monitoring. This kind of automated control not only reduces the errors and uncertainties caused by manual intervention, improves the stability and repeatability of the production process, but also greatly reduces the labor intensity and work difficulty of the operators, allowing the operators to focus more on the monitoring and management of the equipment. At the same time, the operation interface of the equipment is simple and intuitive, easy for operators to learn and master, even non-professional technicians can operate the equipment proficiently after simple training, which further improves the practicality and operability of the equipment, and is conducive to the wide promotion and application of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of a finished product storage tank according to an embodiment of the present invention; Figure 4 For the embodiment of the present invention Figure 3 A schematic diagram of the enlarged local structure at A; Figure 5 A schematic diagram of the structure of a filter assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal structure of a finished product storage tank according to an embodiment of the present invention.

[0020] The markings in the figure are: 1. Reactor; 2. Decolorant storage tank; 3. Finished product storage tank; 4. Central controller; 5. First stirring rod; 6. First motor; 7. Mixed liquid delivery pipe; 8. Flow control valve; 9. Cyanamide aqueous solution delivery pipe; 10. Decolorant delivery pipe; 11. Electromagnetic metering pump; 12. Filter assembly; 13. Connecting pipe; 14. First electromagnetic valve; 15. Water pump; 16. Pressure sensor; 17. Waste pipe; 18. Second electromagnetic valve; 19. Collecting tank; 20. Filter tank; 21. Filter screen; 22. Second stirring rod; 23. Second motor; 24. Finished product delivery pipe; 25. Online concentration analyzer; 26. pH detector; 27. Colorimeter; 28. Drive shaft; 29. ​​Torque sensor; 30. First gear; 31. Second gear; 32. Rotating nozzle; 33. Color sensor. DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0022] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0023] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0024] Example 1 See also Figures 1 to 6 1. Equipment installation and initialization settings First, the reactor 1, the decolorant storage tank 2, the finished product storage tank 3 and the central controller 4 are installed and positioned according to the design layout, and it is ensured that each tank and the connecting pipe are firmly installed and well sealed without leakage risk. The connecting pipe 13, the mixed liquid delivery pipe 7, the decolorant delivery pipe 10, the cyanamide aqueous solution delivery pipe 9 and the finished product delivery pipe 24 are all made of suitable corrosion-resistant materials to adapt to the characteristics of the cyanamide aqueous solution and related chemical substances.

[0025] The preset process parameters are input into the central controller 4, including the ratio between the initial addition amount of the decolorizing agent and the monocyanamide aqueous solution, the stirring time and speed parameters, the initial opening setting of the flow control valve 8, the color standard threshold of the color sensor 33, the online concentration analyzer 25, the pH detector 26 and the quality standard range of the colorimeter 27. These parameters are determined based on a large amount of experimental data and actual production experience to ensure that the equipment can perform the decolorization process as expected and ensure product quality.

[0026] 2. Feeding Operation If there is a delivery pump on the cyanamide aqueous solution delivery pipe 9, the cyanamide aqueous solution is delivered to the reactor 1 at a set flow rate. At the same time, the central controller 4 controls the electromagnetic metering pump 11 to start according to the preset ratio of the decolorant to the cyanamide aqueous solution, and extracts the decolorant from the decolorant storage tank 2. The decolorant flows along the decolorant delivery pipe 10 and enters the reactor 1 through the rotating nozzle 32. The first motor 6 drives the drive shaft 28 to rotate, and the first gear 30 on the drive shaft 28 is meshed with the second gear 31 on the outer periphery of the rotating nozzle 32, so that the rotating nozzle 32 rotates at a constant speed on the top of the reactor 1, and the decolorant is evenly sprayed in the cyanamide aqueous solution to ensure the initial mixing uniformity of the decolorant and the cyanamide aqueous solution.

[0027] 3. Mixing and flow control linkage process The first motor 6 keeps running to drive the first stirring rod 5 to stir the materials in the reactor 1. The torque sensor 29 monitors the torque data of the stirring shaft in real time and transmits the data to the central controller 4.

[0028] When the torque of the stirring shaft changes, it means that the viscosity or mixing state of the material changes. The central controller 4 pre-stores the torque-flow curve relationship data, which is determined through a large number of experiments and process studies, and reflects the mixed liquid flow required to ensure the adequacy of the reaction under different torque values. For example, when the torque of the stirring shaft increases, it indicates that the material mixing resistance increases. It may be that the decolorizing agent reacts with the monocyanamide aqueous solution to form some agglomerates. At this time, the central controller 4 controls the flow control valve 8 to reduce the opening according to the torque-flow curve. The reduction in opening reduces the amount of mixed material flowing out of the bottom of the reactor per unit time, thereby extending the residence time of the material in the reactor, giving the material more opportunities to react and promoting the reaction. On the contrary, if the torque decreases, it may mean that the material mixing uniformity improves or the viscosity decreases. The central controller 4 will appropriately increase the opening of the flow control valve 8 to maintain appropriate production efficiency while ensuring that the reaction effect is not affected.

[0029] The color sensor 33 continuously detects the color change of the mixed liquid in the reactor 1, and feeds back the color depth signal to the central controller 4. When the central controller 4 receives the signal from the color sensor 33 that the color does not reach the preset decolorization standard, it controls the electromagnetic metering pump 11 to increase the amount of decolorization agent added according to the preset color depth-decolorization agent addition ratio to promote the decolorization reaction to proceed further. The stirring process continues until the color sensor 33 detects that the color reaches or approaches the preset standard, or reaches the preset stirring time limit.

[0030] 4. Filtering Operation After the mixing and stirring is completed, the flow control valve 8 is opened, and the mixed liquid in the reactor 1 flows to the filter assembly 12 through the mixed liquid delivery pipe 7 under the action of gravity. The mixed liquid first enters the filter tank 20 and is filtered through the internal multiple layers of stainless steel filter screens 21 with different apertures. The filter screens from large aperture to small aperture filter out impurity particles of different sizes in turn to ensure that the purity of the filtered liquid meets the requirements.

[0031] The pressure sensor 16 monitors the pressure value of the connecting pipe 13 between the filter assembly 12 and the first solenoid valve 14 in real time, and transmits the data to the central controller 4. If the pressure value exceeds the normal range, it may indicate a problem such as filter blockage, and the central controller 4 can issue an alarm to prompt the operator to check or replace the filter. The first solenoid valve 14 remains open during normal filtration, allowing the filtered liquid to flow into the finished product storage tank 3.

[0032] 5. Backwash operation After the equipment has been running for a period of time, or according to the abnormal pressure increase detected by the pressure sensor 16, it is necessary to perform a backwashing operation on the filter assembly 12. The central controller 4 first closes the flow control valve 8 and the first solenoid valve 14 to prevent the mixed liquid being filtered from continuing to flow and to prevent the backwashing impurities from flowing back into the reactor 1 or the finished product storage tank 3. Then, the water pump 15 is started and the second solenoid valve 18 is opened. The backwashing water passes through the filter screen 21 in the reverse direction under the power provided by the water pump 15 to wash off the impurities attached to the filter screen.

[0033] The impurities and wastewater flushed down flow into the collection tank 19 through the waste pipe 17 for collection and treatment. The backwashing process lasts for a certain period of time, and the length of time can be preset in the central controller 4 according to the actual degree of contamination of the filter screen and the equipment design requirements. After the backwashing is completed, the central controller 4 automatically turns off the water pump 15 and the second solenoid valve 18, opens the flow control valve 8 and the first solenoid valve 14, and resumes the normal filtering and production process.

[0034] 6. Finished product storage and quality monitoring The filtered decolorized cyanamide aqueous solution flows into the finished product storage tank 3 through the connecting pipe 13. The second motor 23 at the end of the finished product storage tank 3 is started at a preset time interval to drive the second stirring rod 22 to gently stir the finished product in the storage tank to prevent precipitation or uneven composition of the finished product.

[0035] The online concentration analyzer 25, pH detector 26 and colorimeter 27 continuously monitor the quality of the finished product in the finished product storage tank 3. These monitoring instruments transmit the real-time monitored data to the central controller 4. If all indicators are within the preset quality standard range, the central controller 4 controls the discharge valve on the finished product conveying pipe 24 to open, and the finished product is conveyed to the packaging equipment through the discharge port for packaging.

[0036] If a quality indicator exceeds the standard range, the central controller 4 will immediately send out an alarm signal to remind the operator. At the same time, the central controller 4 will start the corresponding treatment measures according to the specific indicators that exceed the standard. For example, if the concentration is abnormal, the parameters such as the ratio or stirring time of the materials in the previous reactor 1 will be adjusted; if it is a pH problem, the device for adding acid-base regulators will be controlled to add an appropriate amount of acid-base regulators to the finished product storage tank 3 for adjustment; if the color does not meet the requirements, it can be traced back to the amount of decolorizer added, stirring uniformity or filtration links for investigation and treatment, until the quality of the finished product meets the requirements before packaging operations are carried out.

[0037] Through the above specific implementation methods, the complete set of equipment for the combined decolorization of cyanamide aqueous solution can operate efficiently and stably, realize the decolorization treatment of cyanamide aqueous solution, and accurately control and monitor the quality of the entire production process to ensure that the quality of the final product meets the relevant standards and requirements. In the actual production process, the parameters of the equipment and the production process can be further optimized and adjusted according to factors such as the specific production scale and product quality requirements.

[0038] Through the above specific implementation methods, the complete set of equipment for the combined decolorization of cyanamide aqueous solution can operate efficiently and stably, realize the decolorization treatment of cyanamide aqueous solution, and accurately control and monitor the quality of the entire production process to ensure that the quality of the final product meets the relevant standards and requirements. In the actual production process, the parameters and operation process of the equipment can be further optimized and adjusted according to factors such as specific production scale and product quality requirements.

[0039] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A complete set of equipment for decolorizing aqueous cyanamide, comprising a reaction kettle (1), a decolorizing agent storage tank (2), a finished product storage tank (3) and a central controller (4), characterized in that: The bottom of the reactor (1) is provided with a mixed liquid delivery pipe (7), the tail end of the mixed liquid delivery pipe (7) is connected to a filter assembly (12), the output end of the filter assembly (12) is connected to a connecting pipe (13), the tail end of the connecting pipe (13) is connected to the finished product storage tank (3) and the two are interconnected, the top of the reactor (1) is provided with a decolorant delivery pipe (10), the top end of the decolorant delivery pipe (10) is connected to the decolorant storage tank (2) and the two are interconnected, the middle section of the decolorant delivery pipe (10) is provided with an electromagnetic metering pump (11), the inner wall of the top of the reactor (1) is provided with a color sensor (33), the middle section of the mixed liquid delivery pipe (7) is provided with a flow control valve (8), the middle section of the connecting pipe (13) is provided with a first electromagnetic valve (14), and the connecting pipe (13) is located between the first electromagnetic valve (14) and the filter assembly ( A pressure sensor (16) is provided at a position between the first solenoid valve (14) and the filter assembly (12); a water pump (15) is also provided at a position between the first solenoid valve (14) and the filter assembly (12); the water pump (15) is connected to the connecting pipe (13) through a pipeline; a finished product delivery pipe (24) is provided at the bottom end of the finished product storage tank (3); the output end of the finished product delivery pipe (24) is connected to the packaging equipment; an online concentration analyzer (25), a pH detector (26) and a colorimeter (27) are installed on the outer wall of the finished product delivery pipe (24) in sequence; a first motor (6) is provided at the top center of the reactor (1); a drive shaft (28) is coaxially provided at the bottom output shaft of the first motor (6); a torque sensor (29) is coaxially provided at the bottom end of the drive shaft (28); and a first stirring rod (5) is coaxially provided at the bottom end of the torque sensor (29).

2. The complete set of equipment for decolorizing a cyanamide aqueous solution according to claim 1, characterized in that: The filter assembly (12) comprises a cylindrical filter tank (20), wherein a plurality of filter screens (21) are arranged inside the filter tank (20), and the filter screens (21) are multiple layers of filter media with different pore sizes, and the pore sizes decrease successively along the filtering direction.

3. A complete set of equipment for decolorizing cyanamide aqueous solution according to claim 2, characterized in that: The filter screen (21) is made of stainless steel.

4. The complete set of equipment for decolorizing cyanamide aqueous solution according to claim 1, characterized in that: The mixed liquid delivery pipe (7) is provided with a waste discharge pipe (17) at a position between the filter tank (20) and the flow control valve (8), a collection tank (19) is provided at the tail end of the waste discharge pipe (17), and a second solenoid valve (18) is installed in the middle section of the waste discharge pipe (17).

5. The complete set of equipment for decolorizing cyanamide aqueous solution according to claim 1, characterized in that: A second motor (23) is provided at the end of the finished product storage tank (3); a second stirring rod (22) is provided at the output end of the second motor (23); and the second stirring rod (22) is located inside the finished product storage tank (3).

6. The complete set of equipment for decolorizing cyanamide aqueous solution according to claim 1, characterized in that: The top of the reaction kettle (1) is also provided with a cyanamide aqueous solution delivery pipe (9).

7. The complete set of equipment for combined decolorization of cyanamide aqueous solution and the method for using the same according to claim 1, characterized in that: A rotating nozzle (32) is hingedly connected to the rear end of the decolorizing agent delivery pipe (10); a second gear (31) is sleeved on the outer circumference of the rotating nozzle (32); a first gear (30) is meshed on one side of the second gear (31); and the first gear (30) is coaxially sleeved on the outer circumference of the driving shaft (28).

8. The complete set of equipment for combined decolorization of cyanamide aqueous solution and the method for using the same according to claim 1, characterized in that: The central controller (4) is connected to the first motor (6), the electromagnetic metering pump (11), the color sensor (33), the flow control valve (8), the first electromagnetic valve (14), the pressure sensor (16), the water pump (15), the second electromagnetic valve (18), the second motor (23), the online concentration analyzer (25), the pH detector (26), the colorimeter (27) and the torque sensor (29) through wired or wireless communication. The central controller (4) receives data information collected by the color sensor (33), the pressure sensor (16), the torque sensor (29), the online concentration analyzer (25), the pH detector (26) and the colorimeter (27), and controls and adjusts the operating states of the first motor (6), the electromagnetic metering pump (11), the flow control valve (8), the first electromagnetic valve (14), the water pump (15), the second electromagnetic valve (18) and the second motor (23) according to a preset program.

9. The method for using the complete set of equipment for combined decolorization of cyanamide aqueous solution according to any one of claims 1 to 8, characterized in that: The steps are as follows: S1, delivering the cyanamide aqueous solution to the reaction kettle (1) through the cyanamide aqueous solution delivery pipe (9), and at the same time, the central controller (4) controls the electromagnetic metering pump (11) to spray the decolorant from the decolorant storage tank (2) through the decolorant delivery pipe (10) and the rotating nozzle (32) into the reaction kettle (1) in a preset dosage, and the rotating nozzle (32) rotates under the action of the driving shaft (28) driven by the first motor (6) and the first gear (30) and the second gear (31) linked thereto, so as to ensure that the decolorant is evenly dispersed; S2, the first motor (6) drives the driving shaft (28) to rotate, the torque sensor (29) at the bottom end of the driving shaft (28) monitors the stirring torque, the first stirring rod (5) fully stirs the cyanamide aqueous solution and the decolorizing agent in the reaction kettle (1), the color sensor (33) monitors the color change of the material in real time, and when the color does not reach the expected decolorization standard, the electromagnetic metering pump (11) increases the amount of decolorizing agent in proportion to the color depth signal; S3, the mixed liquid is transported through the mixed liquid delivery pipe (7) at the bottom of the reactor (1), the flow control valve (8) controls the flow, and the mixed liquid enters the filter assembly (12), the filter tank (20) inside the filter assembly (12) is provided with multiple layers of stainless steel filter screens (21) with different pore sizes and the pore sizes gradually decrease along the filtering direction, and impurities are gradually filtered out. The pressure sensor (16) on the connecting pipe (13) monitors the filtering pressure, the water pump (15) provides power, and the first solenoid valve (14) controls whether the filtered liquid enters the finished product storage tank (3); S4. When backwashing is required, the central controller (4) automatically closes the flow control valve (8) and the first solenoid valve (14), opens the second solenoid valve (18), and discharges the backwash impurities into the collection tank (19) through the waste pipe (17), thereby preventing the impurities from entering the reaction kettle (1) and the finished product storage tank (3). After the backwashing is completed, the central controller (4) automatically restores the status of each valve to continue production; S5. After the filtered decolorized cyanamide aqueous solution enters the finished product storage tank (3), the second motor (23) at the end of the finished product storage tank (3) drives the second stirring rod (22) to gently stir at a set time interval to ensure uniform composition. The online concentration analyzer (25), pH detector (26) and colorimeter (27) of the finished product storage and quality monitoring unit monitor the quality indicators of the finished product in real time. If all indicators are within the preset quality standard range, the finished product is transported to the packaging equipment through the discharge port for packaging; if any indicator exceeds the standard range, the central controller (4) issues an alarm and initiates corresponding treatment measures according to the specific situation.

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