Grinding system in desulfurization gypsum calcining line

Abstract

The invention discloses a grinding system in a flue gas desulfurization gypsum calcining line, and relates to the technical field of calcining preparation of gypsum, and the grinding system in the flue gas desulfurization gypsum calcining line comprises the following specific steps: step 1, screening flue gas desulfurization gypsum raw materials, and removing large particle impurities by using screening equipment, the device has the advantages that the influence of impurities on the performance of grinding equipment and the final quality of a product is avoided, in addition, the preheating temperature is stabilized at 115 + / -3 DEG C by the heating device capable of accurately controlling the temperature, the temperature change in the preheating bin is monitored in real time by adopting a temperature sensor, the accuracy can reach + / -1 DEG C, and when the temperature is lower than 112 DEG C, the heating power is automatically increased to 8kW, so that the product quality is ensured. And the temperature is rapidly increased through the efficient heating element, and when the temperature is higher than 118 DEG C, the heating power is reduced to 4kW to prevent overheating, so that the desulfurized gypsum is ensured to reach a uniform temperature state after being preheated, a good condition is provided for subsequent grinding, and the grinding efficiency and the product quality are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gypsum calcination preparation, and specifically to a grinding system in a desulfurized gypsum calcination line. Background Technique

[0002] Desulfurized gypsum is a by-product generated during the flue gas desulfurization process in coal-fired power plants. Its main component is calcium sulfate dihydrate (CaSO4・2H2O). With the increasingly strict environmental protection requirements, the resource utilization of desulfurized gypsum has received more and more attention. Among the many applications of desulfurized gypsum, grinding is an important link, which can improve the particle fineness and activity of desulfurized gypsum and enhance its performance in subsequent applications; There are certain technical defects in the existing grinding systems in desulfurized gypsum calcination lines. First, the screening equipment is imperfect, unable to effectively remove impurities, affecting the performance of the grinding equipment and the quality of the product, and the preheating temperature control is inaccurate. Second, the conveying system has low efficiency, the grinding process is extensive, unable to accurately control the fineness, with high energy consumption, and the pipeline is prone to corrosion, increasing the production cost. Therefore, we propose a grinding system in a desulfurized gypsum calcination line. Summary of the Invention

[0003] The purpose of the present invention is to provide a grinding system in a desulfurized gypsum calcination line.

[0004] To solve the problems raised in the above background technique, the present invention provides the following technical solutions: A grinding system in a desulfurized gypsum calcination line, the grinding system in the desulfurized gypsum calcination line includes the following specific steps: Step 1: Screen the desulfurized gypsum raw materials, and use the screening equipment to remove larger particle impurities and smaller impurity particles to ensure the purity of the raw materials entering the subsequent processes; Step 2: Send the screened desulfurized gypsum into the preheating bin, and perform preheating treatment through a heating device to make it reach the initial temperature suitable for grinding, and the preheating temperature needs to be accurately controlled; Step 3: Adopt an intelligent conveying system to smoothly and efficiently convey the preheated desulfurized gypsum to the inlet of the grinding equipment; Step 4: In the grinding equipment, use a unique multi-stage grinding process, combined with different types of grinding components, to gradually grind the desulfurized gypsum to the required fineness; Step 5: Conduct quality inspection on the ground desulfurized gypsum to ensure that indicators such as fineness and activity meet the requirements; Step 6: Seal and store the qualified ground desulfurized gypsum for subsequent use.

[0005] As a further solution of the present invention: in the first step, a vibrating sieve is used as the screening device. Its unique double-layer sieve structure can remove impurities of different sizes. The upper sieve with an 8-mm aperture can intercept larger particulate impurities, including large stones and caked impurities. The lower sieve with a 3-mm aperture further removes fine particulate impurities and dust. At a vibration frequency of 45 Hz, the screening process is efficient and stable, providing high-purity desulfurized gypsum raw materials for subsequent grinding, and avoiding affecting the performance of the grinding equipment and the final quality of the product due to impurities.

[0006] As a further solution of the present invention: in the second step, through a heating device with precise temperature control, ensure that the preheating temperature is stable at 115°C ± 3°C. A temperature sensor is used to monitor the temperature change in the preheating bin in real time, with an accuracy of ±1°C. When the temperature is lower than 112°C, the heating power is automatically increased to 8 kW, and the temperature is quickly raised through an efficient heating element. When the temperature is higher than 118°C, the heating power is reduced to 4 kW to prevent overheating, ensuring that the desulfurized gypsum reaches a uniform temperature state after preheating, providing good conditions for subsequent grinding, making the grinding process more efficient and the product quality more stable.

[0007] As a further solution of the present invention: in the third step, an intelligent conveying system is adopted, with a conveying speed of 8 m³ / min. The conveying pipeline is made of high-strength and corrosion-resistant polytetrafluoroethylene material to ensure the smooth and efficient conveying of materials. The sealed design effectively prevents material leakage. At the same time, an intelligent monitoring device is equipped to monitor the flow rate and pressure during the conveying process in real time. When the flow rate is lower than 68 m³ / min, the system automatically adjusts the conveying speed and checks whether the pipeline is blocked. When the pressure is higher than 0.4 MPa, an alarm is automatically given and corresponding treatment measures are taken, including cleaning the pipeline and adjusting the conveying parameters, to ensure the reliability of the conveying link and ensure that the desulfurized gypsum smoothly enters the grinding equipment.

[0008] As a further solution of the present invention: in the fourth step, a unique multi-stage grinding process is used. In the first-stage grinding, a roller crusher is adopted, with a rotational speed of 280 revolutions per minute. The material is extruded and crushed by high-strength rollers, and the material is crushed to a particle size less than 12 mm. In the second-stage grinding, a ball mill is adopted, with a rotational speed of 580 revolutions per minute. The material is ground to a particle size less than 1.2 mm by the rolling and impact of steel balls. During the grinding process, by monitoring the current and power of the grinding equipment in real time, when the current is higher than 90 A and the power is higher than 48 kW, the feeding speed is reduced to ensure the grinding efficiency and product quality.

[0009] As a further solution of the present invention: in the fifth step, strict quality inspection is carried out on the ground desulfurized gypsum. The fineness requirement is that the passing rate of 200 meshes reaches more than 90%. High-precision screening equipment is used for detection, and the activity index is determined by a specific chemical detection method to ensure that the activity is not less than 80%. At the same time, a strict quality control system is established to timely process unqualified products. If the fineness does not meet the standard, it is returned to the grinding equipment for re-grinding. When the activity is insufficient, the grinding process parameters are adjusted to ensure the stability and reliability of the product quality and provide users with high-quality desulfurized gypsum products.

[0010] As a further solution of the present invention: in the sixth step, the qualified ground desulfurized gypsum is stored in a sealed manner. The storage equipment adopts a sealed structure, and a drying device is arranged inside to keep the relative humidity of the storage environment controlled below 45%. The drying device combines a moisture absorbent and a ventilation system to ensure the dryness of the storage environment. The storage equipment is regularly inspected and maintained to check whether the sealing performance is good and whether the drying device is operating normally, so as to ensure the tightness and dryness of the equipment, extend the storage time of the product, ensure that the quality of the desulfurized gypsum is not affected during storage, and can be put into use at any time.

[0011] As a further solution of the present invention: the grinding equipment adopts an energy-saving motor and a transmission device to reduce the energy consumption of the equipment. During the grinding process, according to the characteristics of the material and the grinding requirements, the power and speed of the motor are reasonably adjusted. When the hardness of the grinding material is relatively large, the motor speed is reduced to 530 revolutions per minute and the power is adjusted to 43 kW. When the material hardness is relatively small, the speed can be appropriately increased to 630 revolutions per minute and the power is 53 kW. At the same time, an advanced energy recovery system is adopted to recover and utilize the heat generated during the grinding process to further improve the energy utilization efficiency.

[0012] Adopting the above technical solutions, compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention uses a vibrating screening machine as the screening device. Its unique double-layer screen structure can effectively remove impurities of different sizes. The upper-layer screen with an 8-mm aperture can intercept larger particulate impurities such as large stones and lumps, and the lower-layer screen with a 3-mm aperture further removes fine particulate impurities and dust. At a vibration frequency of 45 Hz, the screening process is efficient and stable, providing high-purity desulfurized gypsum raw materials for subsequent grinding, avoiding the influence of impurities on the performance of the grinding equipment and the final quality of the product. In addition, the heating device with precise temperature control keeps the preheating temperature stable at 115°C ± 3°C. A temperature sensor is used to monitor the temperature change in the preheating bin in real time, with an accuracy of up to ±1°C. When the temperature is lower than 112°C, the heating power is automatically increased to 8 kW, and the temperature is quickly raised through efficient heating elements. When the temperature is higher than 118°C, the heating power is reduced to 4 kW to prevent overheating. This ensures that the desulfurized gypsum reaches a uniform temperature state after preheating, providing good conditions for subsequent grinding, and greatly improving the grinding efficiency and product quality.

[0013] 2. The present invention uses an intelligent conveying system to smoothly and efficiently convey the preheated desulfurized gypsum to the inlet of the grinding equipment at a speed of 8 m³ / min, greatly shortening the conveying time and improving the overall production efficiency. During the grinding process, the unique multi-stage grinding process combines different types of grinding components. In the first-stage grinding, a roller crusher is used to crush the material to a particle size less than 12 mm, and in the second-stage grinding, a ball mill is used to grind the material to a particle size less than 1.2 mm. This fine grinding process can ensure that the desulfurized gypsum is ground to the required fineness, improving the stability of the product quality. At the same time, the current and power of the grinding equipment are monitored in real time. When the current is higher than 90 A and the power is higher than 48 kW, the feeding speed is reduced in a timely manner, ensuring the grinding efficiency, reducing energy waste and equipment wear, and thus reducing the production cost. In addition, the conveying pipeline is made of high-strength and corrosion-resistant polytetrafluoroethylene material, which not only ensures the smooth and efficient conveying of materials, but also extends the service life of the pipeline and reduces the cost of equipment maintenance and replacement. In summary, the grinding system of the present invention can effectively improve the production efficiency, reduce the production cost, and bring significant economic benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the method steps in the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The following further describes the specific embodiments of the present invention in conjunction with the drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention.

[0016] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0017] Please refer to the appendix Figure 1 , a grinding system in a desulfurized gypsum calcination line of the present invention. The grinding system in the desulfurized gypsum calcination line includes the following specific steps: Step 1: Screen the desulfurized gypsum raw materials. Use screening equipment to remove larger particle impurities and smaller impurity particles to ensure the purity of the raw materials entering the subsequent processes; Step 2: Feed the screened desulfurized gypsum into the preheating bin and perform preheating treatment through a heating device to make it reach the initial temperature suitable for grinding. The preheating temperature needs to be precisely controlled; Step 3: Adopt an intelligent conveying system to smoothly and efficiently convey the preheated desulfurized gypsum to the inlet of the grinding equipment; Step 4: In the grinding equipment, use a unique multi-stage grinding process and combine different types of grinding components to gradually grind the desulfurized gypsum to the required fineness; Step 5: Conduct quality inspection on the ground desulfurized gypsum to ensure that indicators such as fineness and activity meet the requirements; Step 6: Store the qualified ground desulfurized gypsum in a sealed manner for subsequent use.

[0018] In an embodiment of the present invention: In Step 1, a vibrating screen is used as the screening equipment. Its unique double-layer screen structure can remove impurities of different sizes. The upper-layer screen with an 8-mm aperture can intercept larger particle impurities, including large stones and caked impurities. The lower-layer screen with a 3-mm aperture further removes fine particle impurities and dust. At a vibration frequency of 45 Hz, the screening process is efficient and stable, providing high-purity desulfurized gypsum raw materials for subsequent grinding and avoiding the influence of impurities on the performance of the grinding equipment and the final quality of the product.

[0019] In an embodiment of the present invention: In Step 2, through a heating device with precise temperature control, ensure that the preheating temperature is stably maintained at 115°C ± 3°C. Use a temperature sensor to monitor the temperature change in the preheating bin in real time with an accuracy of ±1°C. When the temperature is lower than 112°C, the heating power is automatically increased to 8 kW to quickly raise the temperature through efficient heating elements. When the temperature is higher than 118°C, the heating power is reduced to 4 kW to prevent overheating, ensuring that the desulfurized gypsum reaches a uniform temperature state after preheating, providing good conditions for subsequent grinding, making the grinding process more efficient, and the product quality more stable.

[0020] In one embodiment of the present invention: In step three, an intelligent conveying system is adopted, with a conveying speed of 8 m³ / min. The conveying pipeline is made of high-strength and corrosion-resistant polytetrafluoroethylene material to ensure the smooth and efficient conveying of materials. The sealed design effectively prevents material leakage. At the same time, an intelligent monitoring device is equipped to monitor the flow rate and pressure during the conveying process in real time. When the flow rate is lower than 68 m³ / min, the system automatically adjusts the conveying speed and checks whether the pipeline is blocked. When the pressure is higher than 0.4 MPa, it automatically alarms and takes corresponding treatment measures, including cleaning the pipeline and adjusting the conveying parameters, to ensure the reliability of the conveying link and ensure that the desulfurized gypsum smoothly enters the grinding equipment.

[0021] In one embodiment of the present invention: In step four, a unique multi-stage grinding process is used. In the first-stage grinding, a roll crusher is adopted, with a rotation speed of 280 revolutions per minute. The material is extruded and crushed by high-strength rollers, and the material is crushed to a particle size of less than 12 mm. In the second-stage grinding, a ball mill is adopted, with a rotation speed of 580 revolutions per minute. The material is ground to a particle size of less than 1.2 mm by the rolling and impact of steel balls. During the grinding process, by monitoring the current and power of the grinding equipment in real time, when the current is higher than 90 A and the power is higher than 48 kW, the feeding speed is reduced to ensure the grinding efficiency and product quality.

[0022] In one embodiment of the present invention: In step five, strict quality inspection is carried out on the ground desulfurized gypsum. The fineness requirement is that the passing rate of 200 mesh is more than 90%. A high-precision screening device is used for detection, and the activity index is determined by a specific chemical detection method to ensure that the activity is not less than 80%. At the same time, a strict quality control system is established to timely process unqualified products. For those with unqualified fineness, they are returned to the grinding equipment for re-grinding. When the activity is insufficient, the grinding process parameters are adjusted to ensure the stability and reliability of the product quality and provide high-quality desulfurized gypsum products for users.

[0023] In one embodiment of the present invention: In step six, the qualified ground desulfurized gypsum is stored in a sealed manner. The storage equipment adopts a sealed structure, and a drying device is arranged inside to keep the relative humidity of the storage environment controlled below 45%. The drying device combines a moisture absorbent and a ventilation system to ensure the dryness of the storage environment. The storage equipment is regularly inspected and maintained to check whether the sealing performance is good and whether the drying device is operating normally, to ensure the sealing and dryness of the equipment, extend the storage time of the product, ensure that the quality of the desulfurized gypsum is not affected during storage, and can be put into use at any time.

[0024] In one embodiment of the present invention: The grinding equipment uses an energy-saving motor and a transmission device to reduce the energy consumption of the equipment. During the grinding process, according to the characteristics of the material and the grinding requirements, the power and speed of the motor are reasonably adjusted. When the hardness of the grinding material is relatively large, the motor speed is reduced to 530 revolutions per minute, and the power is adjusted to 43 kW. When the material hardness is relatively small, the speed can be appropriately increased to 630 revolutions per minute, and the power is 53 kW. At the same time, an advanced energy recovery system is adopted to recover and utilize the heat generated during the grinding process, further improving the energy utilization efficiency.

[0025] Example 1. Please refer to the appendix Figure 1 , The intelligent conveying system greatly improves the production efficiency in practical applications. It accurately conveys the preheated desulfurized gypsum to the inlet of the grinding equipment at a stable speed of 8 m³ / min. The conveying pipeline is made of high-strength and corrosion-resistant polytetrafluoroethylene material, which can withstand the friction and corrosion of desulfurized gypsum, ensuring long-term stable operation. At the same time, the intelligent monitoring device real-time monitors the flow rate and pressure during the conveying process. When the flow rate is lower than 6 m³ / min, the system automatically adjusts the conveying speed to avoid material blockage. When the pressure is higher than 0.4 MPa, the system will automatically alarm and take corresponding measures, such as checking whether the pipeline is blocked and cleaning it in time. These intelligent control measures ensure the reliability and stability of the conveying link, making the entire production process smoother.

[0026] Example 2. Please refer to the appendix Figure 1 , The multi-stage grinding process in the grinding equipment adopts an intelligent control system, which automatically adjusts the working parameters of the grinding components according to the characteristics of the material and the grinding requirements. The roller crusher in the primary grinding uses high-strength alloy rollers, which have excellent wear resistance and crushing ability, and quickly crushes the material to a particle size less than 12 mm. The ball mill in the secondary grinding is equipped with high-precision steel balls. Through precise speed control and the rolling impact of the steel balls, the material is ground to a particle size less than 1.2 mm. During the grinding process, the real-time monitoring system can timely feedback the changes in the current and power of the grinding equipment to ensure the grinding efficiency and product quality.

[0027] Example 3. Please refer to the appendix Figure 1 , The quality inspection link uses high-precision inspection instruments to conduct a comprehensive inspection of the ground desulfurized gypsum. The fineness inspection is carried out by a laser particle size analyzer, which can accurately measure the passing rate of 200 mesh to ensure that it reaches more than 90%. The activity index inspection uses chemical analysis methods to accurately determine the active components of desulfurized gypsum. At the same time, strict quality control standards are established to trace and analyze unqualified products, find out the root causes of problems, and timely adjust the production process to ensure the stability and reliability of product quality.

[0028] Specifically, a vibrating sieve is used as the screening equipment. Its double-layer sieve mesh structure is unique. The upper sieve mesh with an aperture of 8 mm can effectively intercept large stone blocks, lumps and other larger particle impurities. The lower sieve mesh with an aperture of 3 mm can further remove fine particle impurities and dust. At a vibration frequency of 45 Hz, the screening process is efficient and stable, providing high-purity desulfurized gypsum raw materials for subsequent grinding, and avoiding the influence of impurities on the performance of the grinding equipment and the final quality of the product. In addition, the heating device with precise temperature control can keep the preheating temperature stable at 115°C ± 3°C, and is monitored in real time by a temperature sensor with an accuracy of ±1°C. When the temperature is lower than 112°C, the heating power is automatically increased to 8 kW and the temperature rises rapidly with the help of highly efficient heating elements; when the temperature is higher than 118°C, the heating power is reduced to 4 kW to prevent overheating. This ensures that the desulfurized gypsum reaches a uniform temperature state after preheating, creates good conditions for subsequent grinding, and significantly improves the grinding efficiency and product quality.

[0029] Specifically, with the help of the intelligent conveying system, the preheated desulfurized gypsum is smoothly and efficiently conveyed to the inlet of the grinding equipment at a speed of 8 m³ / min, greatly shortening the conveying time and improving the overall production efficiency. During the grinding process, the unique multi-stage grinding process is combined with different types of grinding components. In the first-stage grinding, a roller crusher is used to crush the material to a particle size of less than 12 mm. In the second-stage grinding, a ball mill is used to grind the material to a particle size of less than 1.2 mm. This fine grinding process can ensure that the desulfurized gypsum reaches the required fineness and enhance the stability of product quality. At the same time, by monitoring the current and power of the grinding equipment in real time, when the current is higher than 90 A and the power is higher than 48 kW, the feeding speed is reduced in time, which not only ensures the grinding efficiency, but also reduces energy waste and equipment wear, thereby reducing the production cost. In addition, the conveying pipeline is made of high-strength and corrosion-resistant polytetrafluoroethylene material, which not only ensures smooth and efficient material conveying, but also extends the service life of the pipeline and reduces the equipment maintenance and replacement costs. In summary, the grinding system of the present invention can effectively improve the production efficiency, reduce the production cost, and bring significant economic benefits to the enterprise.

[0030] Working principle: First, the desulfurized gypsum raw material enters the vibrating screen. The upper sieve with an 8-mm aperture and the lower sieve with a 3-mm aperture respectively remove larger particle impurities, fine particle impurities and dust. The vibration frequency is 45 Hz to ensure the purity of the raw material. Then, the screened desulfurized gypsum is sent to the preheating bin, and the heating device conducts preheating treatment. The temperature sensor monitors in real time. When the temperature is lower than 112 °C, the heating power is increased to 8 kW to rapidly raise the temperature. When it is higher than 118 °C, the power is reduced to 4 kW to keep the preheating temperature stable at 115 °C ± 3 °C. Then, the preheated desulfurized gypsum is smoothly and efficiently transported to the inlet of the grinding equipment through the intelligent conveying system at a speed of 8 cubic meters per minute. In the grinding equipment, the multi-stage grinding process combines different types of grinding components. The first-stage grinding uses a roller crusher to crush the material to a particle size less than 12 mm, and the second-stage grinding uses a ball mill to grind the material to a particle size less than 1.2 mm. At the same time, the current and power of the grinding equipment are monitored in real time, and the feeding speed is adjusted timely to ensure the grinding efficiency and product quality. After that, the quality of the ground desulfurized gypsum is inspected to ensure that the fineness, activity and other indicators meet the requirements. Finally, the qualified ground desulfurized gypsum is stored in a sealed manner, and the relative humidity of the storage environment is controlled below 45%. Thus, the entire work process is completed.

[0031] Meanwhile, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0032] Some aspects of the present application can be executed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above-mentioned hardware or software can all be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". The processor can be one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DAPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or combinations thereof. In addition, aspects of the present application may be embodied as a computer product located in one or more computer-readable media, the product including computer-readable program code. For example, the computer-readable media may include, but is not limited to, magnetic storage devices (e.g., hard disks, floppy disks, magnetic tapes...), optical disks (e.g., compact disks CD, digital versatile disks DVD...), smart cards, and flash memory devices (e.g., cards, sticks, key drives...).

[0033] The computer-readable media may include a propagated data signal having computer program code embodied therein, for example, on a baseband or as part of a carrier wave. The propagated signal may take many forms, including electromagnetic, optical, and the like, or suitable combinations thereof. The computer-readable media can be any computer-readable media other than a computer-readable storage media, which can communicate, propagate, or transport a program for use by being connected to an instruction execution system, apparatus, or device. The program code located on the computer-readable media can be propagated through any suitable medium, including radio, cable, fiber optic cable, radio frequency signal, or similar media, or any combination of the above media.

[0034] Similarly, it should be noted that, in order to simplify the description disclosed in this application and thus help the understanding of one or more embodiments of the invention, in the foregoing description of the embodiments of this application, sometimes multiple features are merged into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than those mentioned in the claims. In fact, the features of the embodiments are fewer than all the features of the single embodiment disclosed above. In some embodiments, numbers describing components and attribute quantities are used. It should be understood that such numbers used for the description of the embodiments are modified by the modifiers "about", "approximate", or "substantially" in some examples. Unless otherwise stated, "about", "approximate", or "substantially" indicate that the numbers allow a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and such approximate values may change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining general digits. Although the numerical ranges and parameters used to confirm the breadth of the scope in some embodiments of this application are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0035] Although the present invention is disclosed above in its preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, all modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A grinding system in a desulfurized gypsum calcination line, characterized in that: The grinding system in the desulfurized gypsum calcination line includes the following specific steps: Step 1: Screen the desulfurized gypsum raw materials. Use screening equipment to remove larger particle impurities and smaller impurity particles to ensure the purity of the raw materials entering the subsequent processes. Step 2: Feed the screened desulfurized gypsum into the preheating bin and perform preheating treatment through a heating device to make it reach the initial temperature suitable for grinding. The preheating temperature needs to be precisely controlled. Step 3: Adopt an intelligent conveying system to smoothly and efficiently convey the preheated desulfurized gypsum to the inlet of the grinding equipment. Step 4: In the grinding equipment, use a unique multi-stage grinding process and combine different types of grinding components to gradually grind the desulfurized gypsum to the required fineness. Step 5: Conduct quality inspection on the ground desulfurized gypsum to ensure that indicators such as fineness and activity meet the requirements. Step 6: Store the qualified ground desulfurized gypsum in a sealed manner for subsequent use.

2. The grinding system in a desulfurized gypsum calcination line according to claim 1, wherein: In Step 1, a vibrating screen is used as the screening equipment. Its unique double-layer screen structure can remove impurities of different sizes. The upper screen with an 8-mm aperture can intercept larger particle impurities, including large stones and caked impurities. The lower screen with a 3-mm aperture further removes fine particle impurities and dust. At a vibration frequency of 45 Hz, the screening process is efficient and stable, providing high-purity desulfurized gypsum raw materials for subsequent grinding and avoiding affecting the performance of the grinding equipment and the final quality of the product due to impurities.

3. The grinding system in a desulfurized gypsum calcination line according to claim 1, characterized in that: In Step 2, through a heating device with precise temperature control, ensure that the preheating temperature is stably maintained at 115°C ± 3°C. Use a temperature sensor to continuously monitor the temperature change in the preheating bin with an accuracy of ±1°C. When the temperature is lower than 112°C, the heating power is automatically increased to 8 kW to quickly raise the temperature through efficient heating elements. When the temperature is higher than 118°C, the heating power is reduced to 4 kW to prevent overheating, ensuring that the desulfurized gypsum reaches a uniform temperature state after preheating, providing good conditions for subsequent grinding, making the grinding process more efficient, and the product quality more stable.

4. A grinding system in a desulfurized gypsum calcination line according to claim 1, characterized in that: In Step 3, adopt an intelligent conveying system with a conveying speed of 8 m³ / min. The conveying pipeline is made of high-strength and corrosion-resistant polytetrafluoroethylene material to ensure the smooth and efficient conveying of materials. The sealed design effectively prevents material leakage. At the same time, it is equipped with an intelligent monitoring device to continuously monitor the flow rate and pressure during the conveying process. When the flow rate is lower than 68 m³ / min, the system automatically adjusts the conveying speed and checks whether the pipeline is blocked. When the pressure is higher than 0.4 MPa, it automatically alarms and takes corresponding treatment measures, including cleaning the pipeline and adjusting the conveying parameters, to ensure the reliability of the conveying link and ensure that the desulfurized gypsum smoothly enters the grinding equipment.

5. A grinding system in a desulfurized gypsum calcination line according to claim 1, characterized in that: In step 4, a unique multi-stage grinding process is employed. In the first-stage grinding, a roller crusher with a rotational speed of 280 revolutions per minute is used. The high-strength rollers are used to extrude and crush the material, crushing the material to a particle size less than 12 mm. In the second-stage grinding, a ball mill with a rotational speed of 580 revolutions per minute is used. The rolling and impact of steel balls are used to grind the material to a particle size less than 1.2 mm. During the grinding process, the current and power of the grinding equipment are monitored in real time. When the current is higher than 90 A and the power is higher than 48 kW, the feeding speed is reduced to ensure the grinding efficiency and product quality.

6. The grinding system in a desulfurized gypsum calcination line according to claim 1, characterized in that: In step 5, strict quality inspection is carried out on the ground desulfurized gypsum. The fineness requirement is that the passing rate of 200 mesh is more than 90%. A high-precision screening device is used for inspection, and the activity index is determined by a specific chemical detection method to ensure that the activity is not less than 80%. At the same time, a strict quality control system is established to promptly handle unqualified products. For those with unqualified fineness, they are returned to the grinding equipment for re-grinding. When the activity is insufficient, the grinding process parameters are adjusted to ensure the stability and reliability of product quality and provide high-quality desulfurized gypsum products for users.

7. The grinding system in a desulfurized gypsum calcination line according to claim 1, wherein: In step 6, the qualified ground desulfurized gypsum is stored in a sealed manner. The storage equipment adopts a sealed structure, and a drying device is installed inside to keep the relative humidity of the storage environment controlled below 45%. The drying device combines a moisture absorbent and a ventilation system to ensure the dryness of the storage environment. The storage equipment is regularly inspected and maintained to check whether the sealing performance is good and whether the drying device is operating normally, ensuring the tightness and dryness of the equipment, extending the storage time of the product, ensuring that the quality of the desulfurized gypsum is not affected during storage, and being ready for use at any time.

8. The grinding system in a desulfurized gypsum calcination line according to claim 1, characterized in that: The grinding equipment adopts an energy-saving motor and a transmission device to reduce the energy consumption of the equipment. During the grinding process, according to the characteristics of the material and the grinding requirements, the power and rotational speed of the motor are reasonably adjusted. When the hardness of the grinding material is relatively large, the rotational speed of the motor is reduced to 530 revolutions per minute, and the power is adjusted to 43 kW. When the material hardness is relatively small, the rotational speed can be appropriately increased to 630 revolutions per minute, and the power is 53 kW. At the same time, an advanced energy recovery system is adopted to recover and utilize the heat generated during the grinding process to further improve the energy utilization efficiency.

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