Comprehensive utilization system for magnesium slag

Abstract

The invention provides a magnesium slag comprehensive utilization system which comprises a sensible heat recovery device used for heating softened water through sensible heat of magnesium slag to generate high-temperature and high-pressure water and saturated steam; the pneumatic conveying device is used for conveying the cooled magnesium slag subjected to dust removal to a target storage facility, and the pneumatic conveying device comprises a high-wear-resistance conveying pipeline and an intelligent bin pump control system; the screening and crushing device is used for carrying out multi-stage screening and composite crushing treatment on the conveyed magnesium slag to obtain a finished product with a target particle size; and the intelligent integrated control system is used for carrying out collaborative optimization control on the whole system and realizing process automation and predictive maintenance.

Description

Technical Field

[0001] This invention relates to the field of industrial solid waste resource utilization technology, and in particular to a comprehensive utilization system for the recovery, transportation and fine treatment of sensible heat from magnesium slag. Background Technology

[0002] In the treatment of high-temperature magnesium smelting reduction slag, the core technical challenge lies in achieving a balance between high efficiency, low emissions, and long-term stable equipment operation throughout the entire process from high-temperature cooling to fine screening and crushing in the complex industrial environment of high temperature and high dust. During the cooling of high-temperature reduction slag from 900℃ to below 100℃, traditional cooling methods are energy-intensive, have low heat recovery efficiency, and the cooling equipment is prone to frequent maintenance due to high-temperature wear, resulting in poor production continuity. Simultaneously, in the cold slag conveying stage, severe pipeline wear and dust leakage can easily lead to excessive emissions, affecting environmental compliance. In the screening and crushing stage, inaccurate particle size control, severe equipment vibration, and frequent malfunctions make intelligent management difficult. These problems collectively point to a major technical challenge: how to reduce energy consumption, reduce dust emissions, and extend equipment lifespan under harsh conditions of high temperature, high wear, and high dust, while simultaneously ensuring production efficiency and a high level of intelligence, through process optimization and equipment innovation. The contradictions between insufficient heat recovery during cooling and the high-temperature resistance of equipment, the contradiction between pipeline wear resistance and dust control in the conveying process, the contradiction between particle size reduction and equipment stability in screening and crushing, and the contradiction between intelligent monitoring of the entire process and adaptation to complex working conditions, together constitute this comprehensive technical challenge. These sub-problems are interconnected and all stem from the comprehensive requirements of high efficiency, environmental protection, and intelligence in the treatment of high-temperature magnesium smelting reduction slag, urgently requiring technological integration to overcome existing process bottlenecks. Summary of the Invention

[0003] This invention provides a comprehensive utilization system for magnesium slag, mainly comprising: The system includes: a sensible heat recovery device for heating softened water using the sensible heat of magnesium slag to generate high-temperature, high-pressure water and saturated steam; a pneumatic conveying device for conveying cooled magnesium slag to the target storage facility after dust removal, the pneumatic conveying device including a high wear-resistant conveying pipeline and an intelligent silo pump control system; a screening and crushing device for performing multi-stage screening and compound crushing on the conveyed magnesium slag to obtain a finished product of the target particle size; and an intelligent integrated control system for collaboratively optimizing and controlling the entire system to achieve process automation and predictive maintenance.

[0004] Further, the sensible heat recovery device comprises: a transfer bin for receiving high-temperature magnesium slag; a first membrane cooler for cooling the magnesium slag from 900 DEG C to 280 DEG C, while obtaining 1.6 MPa, 190 DEG C high-temperature and high-pressure water; a second membrane cooler for further cooling the low-temperature slag at 280 DEG C to below 100 DEG C, and the cooling water is recycled through a cooling tower; and a steam generator for generating 0.75 MPa, 170 DEG C saturated steam and saturated condensate through pressure reduction flash evaporation by using the high-temperature water from the first cooler, the saturated steam being used for production, and the saturated condensate being returned to the cooler after being pressurized to be heated again.

[0005] Further, the high-wear-resistant conveying pipeline of the pneumatic conveying device adopts a Q355B pipeline and a ceramic composite elbow, the ceramic layer has a hardness of HV1100-1400, and the wear resistance is increased by more than 20 times; the ceramic elbow adopts a modular quick-release design, and the replacement time is not more than 2 hours.

[0006] Further, the intelligent bin-type pump control system of the pneumatic conveying device adopts a fuzzy PID algorithm to adjust the conveying pressure and flow in real time according to the magnesium slag particle size and density, and optimizes the gas-solid two-phase flow field through a digital twin model, so that the conveying efficiency is greater than 95%, and the pipeline pressure loss is less than 5%.

[0007] Further, the screening and crushing device comprises: a vibrating feeder made of Q355B wear-resistant steel and tungsten carbide coating and having a hardness of more than HRC60; a compound frequency screen adopting double-drive eccentric blocks and having adjustable vibration frequency and amplitude, and a multi-stage screening efficiency of more than 98%; and a compound crusher composed of a jaw crusher for coarse crushing and an impact crusher for fine crushing, and provided with hydraulic overload and automatic gap adjustment, and capable of outputting a particle size of less than 3 mm and reducing energy consumption by 25%.

[0008] Further, the intelligent integrated control system is based on an industrial internet architecture, adopts PLC and SCADA systems, collects and monitors equipment and process parameters in real time, and realizes energy saving and efficiency improvement of the system through edge computing-cloud platform collaborative optimization; the control system also integrates a predictive maintenance module based on artificial intelligence, shortens the average repair time by more than 40% through equipment state monitoring and fault early warning.

[0009] Further, the system integrates a bag-type dust collector for efficiently purifying and treating the conveying tail gas, the dust emission concentration is less than 10 mg / m³, the recycling rate of purified gas is greater than 80%, and near-zero emission is realized.

[0010] The technical scheme provided by the embodiment of the application can include the following beneficial effects: This invention discloses a comprehensive utilization system for magnesium slag, which addresses the problems of high energy consumption, excessive dust emissions, and difficult equipment maintenance in the process of cooling, conveying, screening and crushing high-temperature slag. It achieves a comprehensive solution that is efficient, environmentally friendly and intelligent through integrated innovative technologies. This invention uses a primary membrane drum cooler to cool 900℃ reducing slag to 280℃, generating 1.6MPa, 190℃ high-temperature, high-pressure water. This water is then flash-evaporated by a steam generator to 0.75MPa, 170℃ saturated steam, maintaining heat balance through circulating heat exchange. A secondary cooler further cools the slag to below 100℃. Combined with Q355B wear-resistant steel pipes and ceramic composite elbows, the cooled slag is pneumatically transported downstream via a silo pump. A multi-frequency vibrating screen and a composite crusher achieve fine screening and crushing with a particle size ≤3mm. A vibration signal fault early warning system and an energy efficiency optimization system are introduced to improve efficiency. The cooled slag enters a spiral steel plate silo, employing multi-point feeding and high-efficiency pulse dust removal, resulting in dust emissions ≤10mg / m³. This invention achieves full life-cycle management of equipment and reduces energy consumption by more than 20% through centralized DCS monitoring, digital twin, and AI algorithm optimization. The technical effects are a comprehensive improvement in efficient cooling, clean transportation, intelligent management, and environmental protection and energy saving. Detailed Implementation

[0011] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] This embodiment of a magnesium slag comprehensive utilization system may specifically include: Step S101: Obtain high-temperature magnesium smelting reduction slag at approximately 900°C, transport it to a transfer silo, and enter a primary membrane drum cooler to cool the slag temperature to approximately 280°C, while simultaneously obtaining high-temperature and high-pressure water at 1.6 MPa and 190°C.

[0013] The magnesium slag at about 900℃ is obtained from the high-temperature magnesium smelting reduction slag obtaining device, and is transmitted to the transfer bin through the sealed conveying system. The inner wall of the bin is made of high-temperature-resistant material to ensure that the temperature loss of the magnesium slag is minimized during the conveying process. The conveying system realizes continuous transmission through a screw propelling device. The magnesium slag forms a uniform initial accumulation state in the bin. The magnesium slag in the initial accumulation state is obtained from the bin and is conveyed to a first membrane-type drum cooler through a pipeline. The cooler is internally provided with a membrane heat exchange structure. The magnesium slag is indirectly heat-exchanged with cooling water in the drum. The temperature of the magnesium slag is reduced from about 900℃ to 280℃. The cooling water absorbs the sensible heat of the magnesium slag and forms high-temperature and high-pressure water. The high-temperature and high-pressure water is obtained from the cooler and is conveyed to a steam generating device through a heat-conducting pipeline. The high-temperature and high-pressure water is further heated in the device to generate steam with a pressure of 1.6 MPa and a temperature of 190℃. The steam is stably output through a pressure control valve for subsequent process use. The magnesium slag cooled to 280℃ is obtained from the cooler and is subjected to particle size sorting through a screening device. The sorted magnesium slag is conveyed to a storage bin. The storage bin is provided with a Lipu-type spiral edge biting structure to ensure that the magnesium slag is stored in a sealed environment to prevent pollution and heat loss.

[0014] Specifically, the generating step is as follows: In one possible implementation, when the high-temperature magnesium slag is obtained from the high-temperature magnesium smelting reduction slag obtaining device, the sealed conveying system realizes continuous transmission through a screw propelling device. This device uses screw blades to push the magnesium slag forward, which can effectively prevent the magnesium slag from being oxidized due to contact with air during transmission, thereby maintaining the heat and chemical stability of the magnesium slag. The inner wall of the transfer bin is made of high-temperature-resistant material such as ceramic lining, which can withstand high temperature without deformation. This helps to reduce temperature loss and form a uniform initial accumulation state, which is beneficial to the uniformity of the subsequent cooling process. For example, in actual operation, uneven accumulation of magnesium slag can lead to low cooling efficiency, while uniform state can ensure that each part of the magnesium slag is treated consistently, improving the overall heat recovery rate.

[0015] In one possible implementation, the magnesium slag in the initial accumulation state is obtained from the bin and is conveyed to a first membrane-type drum cooler through a pipeline. The membrane heat exchange structure inside the cooler is a thin film-shaped heat exchange surface that can increase the contact area to facilitate rapid heat transfer. The magnesium slag is indirectly heat-exchanged with cooling water while rolling in the drum. This indirect method avoids pollution caused by direct contact. The cooling water absorbs the sensible heat and forms high-temperature and high-pressure water. This not only recovers waste heat but also reduces the temperature of the magnesium slag to a suitable level, which is beneficial to preventing equipment damage caused by high temperature in subsequent processing. For example, in an industrial site, if this structure is not used, low heat exchange efficiency can lead to energy waste, while the membrane design can significantly improve heat energy utilization efficiency and produce high-quality hot water for further use.

[0016] In one possible implementation, high-temperature and high-pressure water is obtained from the cooler and transported to the steam generator through a heat-conducting pipeline. The steam generator is internally provided with a heating element to further increase the temperature of the water to generate steam with specific parameters. The pressure control valve stabilizes the output to ensure uniform steam pressure, which helps to provide reliable energy for downstream processes. For example, in a magnesium smelting plant, such steam can drive pumps or heating equipment, reducing external energy consumption and contributing to overall energy saving. At the same time, if the pipeline does not conduct heat well, heat loss will occur. However, the heat-conducting pipeline wrapped with heat-insulating material can maximize the retention of heat, support the stability of steam generation, and improve system efficiency.

[0017] In one possible implementation, cooled magnesium slag is obtained from the cooler and transported to the particle size sorting device through a screening device. The screening device uses a vibrating screen to separate magnesium slag according to particle size. After sorting, the magnesium slag is transported to the storage bin. The storage bin adopts a Lipu spiral edge structure. This structure forms a cylinder by bending and engaging the spiral metal plate. It has high sealing performance and the advantage of rapid construction. It can effectively prevent the magnesium slag from being contaminated and losing heat from the outside, which is beneficial to maintaining the value of the magnesium slag as an additive. For example, in cement production, uncontaminated magnesium slag with uniform particle size can better integrate into the mixture, improving product strength. Sealed storage can also extend the shelf life, supporting resource utilization and reducing environmental impact.

[0018] The high-temperature and high-pressure water enters the steam generator, undergoes pressure reduction flash evaporation to generate saturated steam with a pressure of 0.75 MPa and a temperature of 170°C. The saturated condensate is pumped to the cooler by a booster pump to be heated and raised in temperature again. This cycle continues, and water is continuously added to maintain heat balance.

[0019] After the high-temperature and high-pressure water is heated to a set temperature by absorbing heat from the cooler, it enters the steam generator for pressure reduction flash evaporation. This produces saturated steam with a pressure of 0.75 MPa and a temperature of 170°C, as well as saturated condensate. The saturated condensate is pumped to the cooler by a booster pump for heat exchange again, and the temperature is raised to a set value. The cooler continuously adds water from the outside during the heat exchange process to maintain heat balance. The added water mixes with the condensate to form high-temperature and high-pressure water. The high-temperature and high-pressure water enters the steam generator again for pressure reduction flash evaporation, generating saturated steam with a pressure of 0.75 MPa and a temperature of 170°C and saturated condensate.

[0020] For example, in the operation of the steam generation system, high-temperature and high-pressure water first absorbs heat through the cooler. When its temperature reaches a preset level, it enters the steam generator for pressure reduction flash evaporation. This flash evaporation uses a sudden drop in pressure to partially vaporize the water, producing saturated steam with a specific pressure and corresponding condensate. This method helps to efficiently convert heat energy into steam form, avoiding energy waste and ensuring stable steam parameters to meet industrial demands. For example, in a chemical plant, this flash evaporation can directly convert heat into steam that can be used to drive turbines, improving overall energy utilization.

[0021] In one possible implementation, the generated saturated condensate needs to be processed by a booster circulating pump, which mechanically increases the condensate pressure to enable smooth return to the cooler for secondary heat exchange and temperature rise to the required value. The role of this pressure boosting process is to maintain the continuity of the circulating flow, prevent system stagnation caused by insufficient pressure, thereby prolonging the service life of the equipment and optimizing the heat exchange efficiency. For example, in the context of power generation, the use of such a pump can reduce pumping energy consumption while ensuring uniform heating of the condensate, resulting in more stable temperature control.

[0022] In one possible implementation, the cooler introduces external water supplement during heat exchange to balance the heat. This supplement mixes with the condensate to form new high-temperature and high-pressure water. The supplement process controls the injection of the appropriate amount of water source through valves, which serves to compensate for evaporation loss and maintain system heat balance, avoiding overheating or insufficient cooling problems, thereby improving the sustainability of the cycle. For example, in the context of metallurgical industry applications, such a water supplement mechanism can prevent material temperature fluctuations, resulting in more reliable heat transfer benefits and supporting long-term uninterrupted operation.

[0023] In one possible implementation, the new high-temperature and high-pressure water formed re-enters the steam generator for repeated decompression and flash evaporation, producing saturated steam and condensate of the same parameters. The role of this cycle design is to achieve repeated use of thermal energy, reduce external energy input, and maintain the continuity of steam output. For example, in the field of food processing, such a cycle can reduce operating costs while ensuring consistent steam quality, resulting in environmental and economic double effects. Through these mutually supporting links, the entire system forms a closed loop, improving overall efficiency.

[0024] The 280℃ reduced slag is cooled to below 100℃ by a two-stage membrane cooler, using Q355B wear-resistant steel pipes and ceramic composite elbows, combined with a warehouse pump with double-warehouse alternating transportation to build a pneumatic conveying system, which transports the cooled slag to the downstream process.

[0025] The high-temperature magnesium slag is obtained from the first membrane drum cooler, and softened water is used as the cooling medium to reduce the temperature of the magnesium slag from high temperature to about 280°C through indirect contact heat exchange to generate a first cold slag stream. The first cold slag stream is transported to the second membrane drum cooler through a pipeline. In the second membrane drum cooler, the first cold slag stream is further cooled, and the temperature of the first cold slag stream is reduced from about 280°C to below 100°C using clean circulating water as the cooling medium to generate a second cold slag stream. The second cold slag stream meets the subsequent transportation and storage requirements. The second cold slag stream is transported to the bin pump, and the Q355B wear-resistant steel pipeline and the ceramic composite elbow are used to build the pneumatic conveying pipeline through the double-bin alternating operation mode. The ceramic composite elbow uses self-propagating technology to generate a corundum inner layer to improve wear resistance, and the transportation of the second cold slag stream to the screening equipment is completed. In the screening equipment, the second cold slag stream is screened at multiple frequencies, and the vibration motor frequency is adjusted in real time based on the cold slag humidity to generate a screened reduced slag material stream. The reduced slag material stream is transported to the downstream process through the pneumatic conveying pipeline.

[0026] Specifically, the generating step is as follows: Illustratively, when the high-temperature magnesium slag is obtained from the first membrane drum cooler, softened water is used as the cooling medium, and the temperature of the magnesium slag is reduced from high temperature to about 280°C through indirect contact heat exchange to generate a first cold slag stream. This heat exchange method avoids pollution caused by direct contact, ensures efficient transfer of heat energy to softened water, and is beneficial to subsequent steam generation and system stability.

[0027] It should be noted that the softened water circulates in the drum, contacts the outer wall of the magnesium slag to absorb heat, and forms a high-temperature water stream. This process is beneficial to reducing heat loss and improving waste heat recovery efficiency.

[0028] In one possible implementation, after the high-temperature magnesium slag enters the drum, the rotation of the drum promotes uniform cooling, and the first cold slag stream enters the connecting pipeline through gravity or mechanical pushing and is transported to the second cooler. This design is beneficial to smooth connection of the continuous production process.

[0029] In one possible implementation, in the second membrane drum cooler, the first cold slag stream is further cooled, and the temperature is reduced from about 280°C to below 100°C using clean circulating water as the cooling medium to generate a second cold slag stream. This clean circulating water system is reused after cooling in the cooling tower, which is beneficial to saving water resources and maintaining environmental friendliness.

[0030] Illustratively, the clean circulating water forms a film covering the surface of the slag stream in the membrane structure to achieve rapid heat exchange. This process is beneficial to preventing equipment damage caused by overheating of the slag material.

[0031] It should be noted that the second cooled slag stream particles are more stable after cooling, suitable for storage, avoiding the possibility of secondary reactions at high temperatures, which improves the reliability of the overall material handling.

[0032] Exemplarily, the second cooled slag stream is transported to a bin pump, which is constructed by Q355B wear-resistant steel pipe and ceramic composite elbow using a double-bin alternating operation mode, to build a pneumatic conveying pipeline, wherein the ceramic composite elbow generates a corundum inner layer using self-propagating technology to improve wear resistance, and the transportation to the screening equipment is completed. This double-bin mode ensures continuous transportation without interruption, which is beneficial to improve production efficiency.

[0033] It should be noted that the self-propagating technology involves a high-temperature reaction to generate a dense corundum layer, which is combined with a Q355B steel base to form a high-hardness inner lining, which is beneficial to resist slag wear and prolong the service life of the pipeline.

[0034] In one possible implementation, the bin pump alternately fills and discharges the second cooled slag stream, which is reduced in resistance loss through the elbow under the action of pneumatic propulsion, and this design is beneficial to reduce maintenance frequency and optimize the conveying path.

[0035] In one possible implementation, in the screening equipment, the second cooled slag stream is subjected to multi-frequency screening, the vibration motor frequency is adjusted in real time based on the humidity of the cooled slag, a screened slag material stream is generated, and then it is transported to the downstream process through the pneumatic conveying pipeline. This humidity adjustment mechanism monitors and adjusts the frequency through a sensor, which is beneficial to prevent screen clogging and maintain efficient separation.

[0036] Exemplarily, when the humidity increases, the frequency is reduced to enhance the vibration intensity, which is beneficial to effective separation of fine particles.

[0037] It should be noted that multi-frequency screening combined with multi-frequency vibration mode improves the material classification accuracy, and this process is beneficial to obtain uniform material in the downstream process, improve the quality of the final product, and reduce waste.

[0038] A multi-frequency vibration screen, a combined crusher, and a scraper conveyor are provided, a multi-stage screening and crushing process is adopted, a fault early warning and energy efficiency optimization system based on vibration signals is introduced, the screening and crushing efficiency is improved, and the particle size of the obtained finished product is ≤3 mm.

[0039] The vibration signal data of the complex frequency vibration screen is acquired, the frequency and amplitude data of the vibration motor during the screening process are collected in real time through the sensor, and a vibration signal sequence is generated. Fast Fourier transform is performed on the vibration signal sequence to extract the main frequency component and amplitude variation feature, and a vibration characteristic dataset is formed. The main frequency component and amplitude variation feature are extracted from the vibration characteristic dataset, a support vector machine algorithm is used to classify the vibration characteristic dataset, whether there is a screen hole clogging or an abnormal state of the equipment is judged, and a fault warning signal is generated. The fault warning signal is used to trigger an adaptive adjustment instruction to adjust the frequency of the vibration motor. According to the adaptive adjustment instruction, the frequency of the vibration motor of the complex frequency vibration screen is controlled, the material flow state of the screening process is optimized, and the particle size distribution data of the screened material is generated. The particle size distribution data of the screened material is transmitted to the control system of the composite crusher to adjust the rotating speed of the crusher and the feeding rate. The particle size data of the crushed material is acquired from the composite crusher, the material is transported to the next screening equipment through the scraper conveyor, the particle size distribution of the material in the conveying process is monitored in real time, and a particle size detection report is generated. The particle size detection report is used to verify whether the finished product particle size meets the standard of less than or equal to 3 mm.

[0040] Specifically, the generating step is as follows: Exemplarily, when acquiring the vibration signal data of the complex frequency vibration screen, the frequency and amplitude data are collected in real time through the acceleration sensor installed on the vibration motor. This can capture the dynamic changes of the material flow during the screening process, which is beneficial to subsequent analysis to avoid screen clogging.

[0041] Specifically, the sensor collects hundreds of data points per second to generate a vibration signal sequence. This sequence reflects the fluctuation of vibration intensity, thereby providing basic data for feature extraction. The beneficial effect is to improve the response speed and stability of the screening equipment.

[0042] In one possible implementation, if the material humidity is high, causing the vibration signal sequence to show an increase in low-frequency amplitude, which indicates the risk of hole clogging. By fast Fourier transform, the time domain signal is converted into the frequency domain, the main frequency component such as the dominant vibration frequency and the amplitude variation feature are extracted, and the vibration characteristic dataset is formed. This can identify abnormal patterns from the frequency spectrum, which is beneficial to optimizing the screening efficiency as soon as possible.

[0043] In one possible implementation, after extracting the main frequency component and amplitude variation feature from the vibration characteristic dataset, a classification model is constructed using a support vector machine algorithm. This algorithm distinguishes between normal and abnormal states by finding a hyperplane in a high-dimensional space. For example, the main frequency component is used as an input vector to judge screen hole clogging or equipment abnormalities. This can generate accurate fault warning signals, and the beneficial effect is to reduce the downtime of the equipment.

[0044] Specifically, the support vector machine algorithm first trains the historical vibration characteristic dataset to learn the feature boundary under normal state, and then classifies the real-time data. If the amplitude variation feature exceeds the boundary, a pre-warning signal is generated, which triggers the adaptive adjustment instruction to adjust the frequency of the vibration motor, which is beneficial to maintain the uniform distribution of the material and improve the continuity of the overall screening process.

[0045] Illustratively, when controlling the frequency of the vibration motor of the complex frequency vibration screen according to the adaptive adjustment instruction, if the pre-warning signal indicates that the hole is blocked, the system will increase the frequency to enhance the separation of the material, so as to optimize the flow state of the material in the screening process to generate the particle size distribution data of the material after screening. The beneficial effect is to ensure uniform particle size and reduce the entry of oversized particles into the downstream equipment.

[0046] Specifically, the screening data after adjustment is obtained by a laser particle size analyzer, a particle size distribution curve is displayed, and then transmitted to the control system of the compound crusher to adjust the rotating speed and the feeding rate, for example, to reduce the rotating speed to process harder material. This can match the output of the upstream, which is beneficial to improve the crushing efficiency and prevent equipment overload.

[0047] In one possible implementation, after obtaining the particle size data of the crushed material from the compound crusher, the material is transported to the next screening equipment by a scraper conveyor, while using an online camera and sensors to monitor the particle size distribution of the material during the conveying process to generate a particle size detection report. This can verify whether the particle size of the finished product meets the standard of less than or equal to 3 mm, and the beneficial effect is to realize closed-loop quality control and reduce the waste rate.

[0048] Specifically, the scraper conveyor advances the material at a uniform speed, and if the monitoring data shows a deviation in particle size, the upstream parameters are adjusted. This report contains distribution statistics, which is beneficial to the optimization of the entire multi-stage screening and crushing process, ensuring that the final product meets the requirements.

[0049] The cold slag finally enters the spiral steel plate silo for storage, which is provided with multi-point feeding, partition fluidization and high-efficiency pulse dust removal. The material in the silo is not cemented and adhered, the dust emission is ≤10 mg / m³, and clean and environmentally friendly is achieved.

[0050] The cold slag is evenly distributed in the spiral steel plate silo through a multi-point feeding device, and is transmitted from the screening equipment to multiple feeding ports on the top of the silo through a pneumatic conveying pipeline. The feeding ports are equipped with flow control valves, and the feeding amount is adjusted in real time according to the material distribution in the silo to generate uniform material accumulation distribution. A partitioned fluidization control is implemented for the material accumulation distribution, multiple independent fluidization areas are arranged at the bottom of the silo, a fluidization air pipe and a pressure sensor are arranged in each area, the air flow of each area is adjusted based on the material accumulation distribution to generate a stable material fluidization state. The material flow data is obtained from the fluidization state, and a high-efficiency pulse dust collector is used to capture dust at the top of the silo and each discharging point. The pulse dust collector controls the dust capture efficiency through a preset pulse frequency to generate dust-containing gas meeting the emission standard. For the dust-containing gas, a gas detection device is used to monitor the emission concentration in real time. If the emission concentration is lower than a preset threshold, the sealing structure and the spiral edge of the silo are maintained to keep the material in the silo from being cemented and adhered, and a clean and environmentally friendly storage environment is generated.

[0051] Exemplarily, in the application of the multi-point feeding device in the spiral steel plate silo, the cold slag is transmitted from the screening equipment to multiple feeding ports on the top of the silo through a pneumatic conveying pipeline. Each feeding port is equipped with a flow control valve, and the feeding amount is adjusted in real time according to the feedback of the material distribution sensor in the silo. This can ensure uniform material accumulation and avoid local overload caused by blockage, which is beneficial to prolong the service life of the silo and improve the storage efficiency.

[0052] In a possible implementation, the flow control valve adopts an electromagnetic adjustment mechanism. When it is detected that the material height in a certain area is higher than the average value, the flow of the feeding port is automatically reduced, thereby generating uniform material accumulation distribution. Such uniformity helps to stabilize the subsequent fluidization process, reduces energy consumption, and improves overall operation reliability.

[0053] Specifically, in a similar system in a cement plant, such a device can control the material distribution deviation at a low level, which is beneficial to prevent deformation caused by uneven wall stress.

[0054] In a possible implementation, for the partitioned fluidization control of the material accumulation distribution, multiple independent areas are divided at the bottom of the silo, a fluidization air pipe and a pressure sensor are installed in each area, and the air flow is dynamically adjusted based on the accumulation distribution data, for example, the air flow is increased to loosen the material when the pressure sensor in a certain area shows that the material is dense. This generates a stable material fluidization state, which is beneficial to prevent cementation and ensure smooth discharging.

[0055] Exemplarily, in the field of powder storage, such control can significantly reduce the blockage rate caused by uneven fluidization. Through the combination of real-time feedback of the sensor and adjustment of the air flow, the response speed of the system and the material flow are improved, thereby supporting the implementation of efficient dust removal operation.

[0056] Specifically, the material flow data obtained from the fluidized state can be used to guide the operation of the efficient pulse dust collector installed at the top of the silo and the dropping point, which removes dust from the filter bag by presetting the pulse frequency such as intermittent blowing to generate dust-containing gas meeting the emission standard. This method is beneficial to capture fine particles, improve air quality and meet environmental protection requirements.

[0057] In one possible implementation, the pulse frequency is adjusted according to the flow data. If the flow is active, the frequency is increased to cope with more dust, which is beneficial to achieve dust emission below the threshold and enhance the green performance of the system.

[0058] Exemplarily, the monitoring of the dust-containing gas uses a gas detection device to check the emission concentration in real time. If it is below the preset threshold, the silo sealing structure and the spiral edge design are used to maintain a non-caked state. For example, the spiral edge enhances the sealing of the silo body to prevent air infiltration, which causes material adhesion, generating a clean and environmentally friendly storage environment. This design is beneficial to maintain the quality of the material during long-term storage and reduce environmental pollution, supporting sustainable industrial operation.

[0059] The whole system is monitored by DCS, and digital twin and AI algorithms are used to realize the whole life cycle management of the equipment and real-time optimization of the process parameters, and the overall energy consumption is reduced by more than 20%.

[0060] The device operation data is obtained from the digital twin platform, a virtual model of the cold slag treatment system is constructed, the operation parameters of the Roots blower, dust collector and pneumatic conveying pipeline are synchronized in real time, and dynamic mapping data of the equipment state is generated. According to the dynamic mapping data, the support vector machine algorithm is used to classify the equipment operation parameters, judge the energy consumption abnormal points of each equipment, and generate the equipment energy consumption abnormal distribution characteristics. Key parameters are extracted from the equipment energy consumption abnormal distribution characteristics, and the edge-cloud collaborative optimization mechanism is combined to input the abnormal parameters into the distributed control system, adjust the operating frequency of the Roots blower and the flow of the pneumatic conveying pipeline, and generate the optimized process parameter configuration. The optimized process parameter configuration is applied in the distributed control system to adjust the operation state of the cold slag treatment system in real time, monitor the performance of the equipment throughout the life cycle through the virtual model, and generate control instructions to reduce energy consumption.

[0061] Specifically, the generation step is as follows: Exemplarily, when obtaining the device operation data from the digital twin platform, the digital twin platform is a technology that creates a virtual copy based on physical equipment. The data such as the rotating speed of the Roots blower and the pressure of the dust collector are collected in real time through sensors to construct a virtual model of the cold slag treatment system. This virtual model simulates the operating state of the actual equipment, synchronizes the flow parameters of the pneumatic conveying pipeline in real time, and generates dynamic mapping data of the equipment state. This can reflect the changes of the equipment in time and is beneficial to subsequent optimization.

[0062] In a possible implementation, for dynamic mapping data, the device operation parameters are classified by a support vector machine algorithm, which is a supervised learning method that separates different categories of data by finding the maximum interval hyperplane, such as classifying the energy consumption parameters of the Roots blower into normal and abnormal categories, judging the energy consumption abnormal points of each device, and generating device energy consumption abnormal distribution characteristics. This classification can accurately identify problem points and is beneficial to reducing overall energy consumption.

[0063] For example, when extracting key parameters from the device energy consumption abnormal distribution characteristics, a edge-cloud collaborative optimization mechanism is combined, which means that local edge devices process real-time data and cooperate with the cloud for in-depth analysis. Abnormal parameters such as blower frequency deviation are input to the distributed control system, which is a decentralized automation control architecture that coordinates work through multiple controllers to adjust the operating frequency of the Roots blower and the flow of the pneumatic conveying pipeline, and generates optimized process parameter configurations. This adjustment can improve system efficiency and is beneficial to energy consumption management.

[0064] In a possible implementation, when applying the optimized process parameter configuration in the distributed control system, the operating state of the cold slag treatment system is adjusted in real time, and the performance of the device throughout its life cycle is monitored through a virtual model. This monitoring process involves tracking data throughout all stages from installation to scrap, generating control instructions to reduce energy consumption, such as reducing blower power during high load. This monitoring can extend the service life of the device and is beneficial to achieving more than 20% reduction in overall energy consumption.

[0065] The specific embodiments of the application are described above. It should be understood that the application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

Claims

1. A comprehensive utilization system for magnesium slag, characterized in that, include: The system includes: a sensible heat recovery device for heating softened water using the sensible heat of magnesium slag to generate high-temperature, high-pressure water and saturated steam; a pneumatic conveying device for conveying cooled magnesium slag to storage facilities after dust removal, the pneumatic conveying device including a high-wear-resistant conveying pipeline and an intelligent silo pump control system; a screening and crushing device for multi-stage screening and compound crushing of magnesium slag to obtain finished products of the target particle size; an intelligent integrated control system for system collaborative optimization control to achieve process automation and predictive maintenance; and a bag filter integrated at the outlet of the pneumatic conveying device for exhaust gas purification.

2. The system according to claim 1, characterized in that, The sensible heat recovery device includes: a transfer silo for receiving high-temperature magnesium slag; a primary membrane cooler for cooling the magnesium slag from 900°C to 280°C and generating high-temperature, high-pressure water at 190°C and 1.6MPa; a secondary membrane cooler for cooling the 280°C magnesium slag to below 100°C, with the cooling water being circulated through a cooling tower; and a steam generator for using the high-temperature, high-pressure water from the primary membrane cooler to generate saturated steam at 170°C and 0.75MPa, with the saturated condensate being pressurized and returned to the primary membrane cooler.

3. The system according to claim 1, characterized in that, The high wear-resistant conveying pipeline includes: a Q355B pipeline body and a ceramic composite elbow, wherein the ceramic layer of the ceramic composite elbow has a hardness of HV1100-1400; the ceramic composite elbow adopts a modular quick-release design, and the replacement time is ≤2 hours.

4. The system according to claim 1, characterized in that, The intelligent silo pump control system employs a fuzzy PID algorithm to adjust the delivery pressure and flow rate in real time; it optimizes the gas-solid two-phase flow field through a digital twin model, achieving a delivery efficiency of >95% and a pipeline pressure loss of <5%.

5. The system according to claim 1, characterized in that, The screening and crushing device includes: a vibrating feeder made of Q355B wear-resistant steel and tungsten carbide coating, with a hardness ≥HRC60; a multi-frequency screen equipped with dual-drive eccentric blocks and adjustable vibration frequency and amplitude, with a screening efficiency >98%; and a compound crusher composed of a jaw crusher and an impact crusher, equipped with hydraulic overload protection and an automatic gap adjustment device, with an output particle size ≤3mm.

6. The system according to claim 1, characterized in that, The intelligent integrated control system is based on an industrial internet architecture and uses PLC and SCADA systems to monitor equipment and process parameters in real time; it optimizes energy consumption through edge computing and cloud platform collaboration; and it integrates an AI predictive maintenance module to shorten the average equipment repair time by more than 40%.

7. The system according to any one of claims 1-6, characterized in that, The dust emission concentration of the bag filter is ≤10mg / m³, and the purified gas reuse rate is >80%.