396 results about "Process design" patented technology

The invention provides an evaluation method for surfacing repair of a supporting roller, and belongs to the technical field of surfacing repair, and the evaluation method comprises the following steps: S1, preprocessing: constructing a digital twinborn model according to size data; s2, defect detection: analyzing the flaw detection data in combination with a convolutional neural network, generating defect data, and feeding back the defect data to the digital twinborn model in real time; s3, process design: inputting the optimized process parameters and material component information into a digital twinborn model; s4, surfacing repair: collecting data of temperature, stress and welding parameters in real time, and associating the data with the digital twinborn model in real time; and S5, post-welding treatment is conducted, specifically, detected data are fed back to the digital twinborn model, and the effect of the whole surfacing repair process is evaluated. According to the evaluation method for surfacing repair of the supporting roller, accurate evaluation and optimization of the surfacing repair process of the supporting roller are achieved, the repair quality and efficiency are improved, the production cost is reduced, and a powerful guarantee is provided for stable operation of steel rolling production.

The invention belongs to the technical field of engineering construction equipment, and discloses a trolley variable-diameter launching method which comprises the following steps: firstly, reducing the width of a trolley from 6m to 4.9 m through a trolley narrowing mechanism so as to transport and hoist in a limited space and complete assembly; when tunneling to 80m, expanding the width of the trolley to 6m, and recovering the bearing capacity of the trolley; continuously tunneling to 110m, hoisting a subsequent trolley, and connecting to form a complete machine; and after the shield body passes through the starting tunnel portal, the diameters of the cutter head, the shield body and the shield tail are synchronously expanded to the size required by construction. According to the method, through the flow design of narrowing transportation, reducing assembly and step-by-step expansion, the problems that a traditional shield tunneling machine cannot be started in a limited space and the construction efficiency is low are solved, and the construction efficiency and feasibility under the complex working condition are improved.

The invention discloses a catalyst process design and optimization method and device, and belongs to the field of machine learning. The method comprises the steps of obtaining original process data in a catalyst production process, performing data cleaning and feature engineering processing, and generating a preprocessing data set capable of being used for modeling; screening a plurality of candidate machine learning models by using an AutoML technology, and performing hyper-parameter optimization on the baseline model; an incremental learning technology is adopted to update the optimized model online in real time so as to adapt to data fluctuation in the production process; and finally, the online updated model is applied to quality prediction and process parameter adjustment, so that closed-loop optimization of the production process is realized, and the product consistency and the production efficiency are improved. According to the method, the automation level and the intelligent quality control capability in catalyst production can be effectively improved.

The invention relates to the technical field of plastic product processing, and discloses a high-toughness plastic bag processing technology which comprises the following steps: firstly, primarily sorting recycled main raw materials, recording sources, grade classification and processing states, configuring a centralized feeding system and an intelligent proportioning program, and carrying out intelligent proportioning on the main raw materials; the mixed raw materials are injected into a five-layer co-extrusion die head or an annular die head structure, then an extrusion film body is controlled through a control system to conduct film blowing treatment on an extruded film to form film bubbles, then film blowing is conducted, the film bubbles are cooled through a 360-degree cooling air ring and an internal air core, the film obtained after film blowing is completed is pulled to a winding section through a winding system, and then the film is obtained. Before rolling, mechanical performance indexes are detected through an online monitoring instrument, and a finished film roll enters a bag making / slicing section according to order requirements. Through fine treatment and multi-layer co-extrusion process design of recycled plastics, high-proportion recycled materials are effectively applied to production of plastic bags, and the effect of remarkably improving the utilization rate of the recycled materials is achieved on the premise that the performance of finished products is not reduced.

The invention discloses a non-autoclaved prestressed concrete pipe pile and a preparation method thereof, and relates to the field of fish culture. According to the autoclave-free prestressed concrete pipe pile and the pipe pile preparation method, through collaborative innovation of a material system and process design, comprehensive breakthrough is achieved in the aspects of mechanical properties, environmental protection benefits and environmental adaptability; in the aspect of technical performance, the hydration activity in a low-temperature environment is remarkably improved due to introduction of the phosphorus slag and the composite exciting agent in the cementing material, so that the compressive strength of the pipe pile in 28 days in the environment of-20 DEG C reaches 95% or above of a standard value (embodiment 3: 98.0 MPa), and meanwhile, the compactness of concrete is improved by 20% or above due to optimal grading of the nickel ore slag sand and the two-graded broken stone; after 300 times of freezing and thawing cycles, the mass loss is only 2.8% (embodiment 1), the chloride ion permeability coefficient is as low as 1.4 * 10 <-12 > m < 2 > / s, and the anti-permeability and durability are obviously superior to those of a traditional autoclaved pipe pile (contrast experiment: freezing and thawing loss rate reaches 46%).

The application discloses a high-temperature alloy component and process design method, comprising the following steps: collecting data of a certain brand high-temperature alloy manual, experiment and literature, and constructing a database; using a machine learning algorithm to construct a corresponding performance prediction model, using a Bayesian optimization technology, taking the required optimized alloy component range as a search range, and taking a comprehensive performance index as an optimization target to realize alloy component optimization to obtain excellent comprehensive performance; through the machine learning algorithm, process optimization of small sample data comprehensive performance is realized; and the optimized alloy component and process casting alloy are used to verify the optimized comprehensive performance. Through collecting data as a training set to train the model, the application analyzes the influence law of alloy components and processing technology on the structure performance, designs the optimized alloy components and process, reduces the cost of manpower and material resources, and reduces the research and development cycle of cast nickel-based high-temperature alloy.

The invention relates to Nb / Ti / RE composite microalloyed 20CrMoH steel and a preparation method thereof, and relates to the technical field of steel for high-end robot gears. The Nb / Ti / RE composite microalloyed 20CrMoH steel comprises the following chemical components in percentage by mass: 0.15 to 0.25 percent of C, 0.2 to 0.25 percent of Si, 0.80 to 1.0 percent of Mn, 0.8 to 1.0 percent of Cr, 0.15 to 0.25 percent of Mo, 0.015 to 0.025 percent of Nb, 0.015 to 0.025 percent of Ti, 0.020 to 0.040 percent of Al, 0.0030 to 0.0050 percent of RE, less than or equal to 0.008 percent of P, less than or equal to 0.008 percent of S and the balance of Fe. And the balance of Fe and other inevitable impurities. On the basis of rare earth Y element and Nb / Ti / RE composite microalloying cooperation, a multi-stage rolling process design is combined, a banded structure appearing in traditional CrMo series gear steel hot rolling is eliminated, the structure distribution uniformity is improved, and the mechanical property stability is improved. The gear steel produced through the method is uniform in structure and stable in performance, the performance requirement of high-end gear steel can be met, and remarkable economic benefits are generated.

The invention discloses a product assembly process knowledge pushing method, system and equipment in the technical field of semantic recognition and knowledge graph construction, and the method comprises the steps: carrying out the construction of a knowledge graph through employing a trained Bert-BiLSTM-CRF model and an LLM-KE model according to the obtained product assembly process information, obtaining a first initial knowledge graph and a second initial knowledge graph; and screening the first initial knowledge graph and the second initial knowledge graph by using a structural rationality discrimination module SRDM, performing knowledge graph evaluation on the screened first initial knowledge graph and the screened second initial knowledge graph by using a trained LLM-KGE model, and constructing a product assembly process knowledge graph APKG-CP according to an evaluation result. And pushing assembly process knowledge based on Bayesian network intelligent reasoning. According to the method, knowledge pushing can be completed in different process design requirements, and the efficiency of man-machine collaborative operation is improved.

The invention belongs to the technical field of metallurgy, and particularly relates to a hot-dip galvanized dual-phase steel plate which comprises the following chemical components in percentage by mass: 0.10%-0.20% of C, 0.5%-1.0% of Si, 1.8%-2.5% of Mn, less than or equal to 0.080% of P, less than or equal to 0.010% of S, 0.030%-0.060% of Alt, 0.2%-0.6% of Cr, 0.025%-0.035% of Nb, 0.010%-0.025% of Ti, 0.0020%-0.0030% of B, less than or equal to 0.0040% of N and the balance of Fe and inevitable impurities. The niobium microalloying is combined with the process design, so that the high elongation and the high hole expansion rate of the high-strength steel are both considered in a wide strength range, the overall forming performance and the local forming performance of the hot-dip galvanized dual-phase steel are improved at the same time, and the requirements of light weight for vehicle body complex structural parts and personalized use are met.

The invention discloses a composite material liner and a production process thereof, and the production process comprises the following steps: carrying out plasma surface activation treatment on a foam substrate to obtain an activated foam substrate; the activated foam substrate and a polyester film are placed in ultraviolet irradiation equipment to be subjected to modified composite treatment, and a composite base material is obtained; performing line-by-line irradiation on the composite base material along a preset grid pattern based on a laser, forming a groove network structure on the surface of the composite base material, and obtaining a grid base material with grid identification lines; the grid base material is subjected to nanometer coating spraying treatment, and a coating base material is obtained; the coating base material is subjected to hot-pressing shaping treatment, and a semi-finished liner product is obtained; and the semi-finished liner is subjected to laser cutting treatment according to the preset size, and the composite liner is obtained. Through the integrated process design, the technical bottleneck that in the prior art, the surface structure machining precision is insufficient is remarkably overcome, and the applicability and reliability of the product in the electronic equipment industry, the automotive trim industry and the packaging industry are remarkably improved.

The invention relates to the technical field of machine tool machining, and discloses an off-axis aspherical mirror polishing method, device and equipment and a storage medium, and the method comprises the steps: building a female aspherical geometric model, and dividing an off-axis region based on the female aspherical geometric model and a preset design requirement; performing trajectory planning based on the off-axis region to obtain a polishing path; constructing a removal function model based on the off-axis region; obtaining a surface shape residual error from the off-axis aspherical mirror to be polished, and solving and obtaining residence time based on the removal function model, the surface shape residual error and the polishing path; constructing a five-axis machine tool kinematic model; the residence time and the polishing path are substituted into the five-axis machine tool kinematic model to obtain polishing control parameters; through the process design of off-axis area positioning, path planning, modeling removal, residence solution and coordinate conversion, stable control over the machining precision of the asymmetric structure of the off-axis aspherical mirror is achieved, and the high-precision manufacturing requirement of a high-performance optical system for the off-axis aspherical mirror is stably met.

The invention discloses an alkaline coal-water corrosion-resistant wear-resistant steel and a preparation method thereof. By reasonably adding elements such as Cr, Cu, Ni, and Sb, the self-corrosion potential and hardness a of the steel plate are improved, and at the same time, a wear-resistant steel with a structure of lower bainite + martensite + retained austenite is obtained; and through process design, the occurrence of cracks in the Sb-containing wear-resistant steel during the production process is effectively suppressed, and a large amount of Ti precipitated phases are retained inside the structure as hydrogen traps, thereby reducing the risk of delayed cracking of the Sb-containing wear-resistant steel plate during use; and through the composite addition of Ti and Mo, in conjunction with a slow cooling process and a heat treatment process design, a large amount of Ti and Mo composite carbides are retained in the quenched steel plate, and these carbides serve as hydrogen traps, thereby greatly improving the hydrogen-induced crack resistance of the Sb-containing wear-resistant steel during service, and finally obtaining alkaline coal-water corrosion-resistant wear-resistant steel with excellent mechanical properties and resistance to hydrogen-induced cracks.

The invention discloses a large metal thin-wall component manufacturing method based on stress distribution state management, which comprises the following steps of: aiming at the configuration of a large metal thin-wall component to be manufactured, constructing a manufacturing process combining reverse modeling analysis and forward process design; the reverse modeling analysis starts from the working step at the tail end of the manufacturing process, the stress distribution state between the working steps serves as a transmission and control element, and in the direction from the tail end to the front end, each working step proposes the final stress distribution state meeting the most simplified requirement of the manufacturing scheme of the working step for the previous working step; and based on the result of the reverse modeling analysis, on the basis of the final stress state determined by the previous step, the tool and the forming process of each step are determined, so that the final stress distribution state of the component manufactured by the step meets the requirements of the next step. The problems that the forming precision of a large metal thin-wall component welding component is poor, the precision coordination consistency of all procedures is poor, and the component manufacturing quality is difficult to guarantee are solved.

The invention discloses a TC11 titanium alloy thick-wall pipe diameter forging process parameter optimization method, which relates to the technical field of metal plastic forming process optimization, and comprises the following steps: clearly defining a structure defect problem caused by non-uniform deformation energy in diameter forging of a specific pipe blank and an optimization target; constructing a simulation model to calculate forming sizes and internal deformation energy distribution under different process parameters; training a neural network agent model embedded with a deformation energy uniformity optimization target; using the model to drive a multi-objective optimization algorithm, and automatically searching an optimal process parameter combination; and selecting and outputting a final optimal process parameter from an optimization result. According to the method, the quantitative index reflecting the deformation energy distribution uniformity is embedded into the process optimization model, so that the internal deformation energy distribution of the material can be collaboratively optimized while the macroscopic size is optimized, and the problem that the recessive factor which affects the final structure performance of the component is difficult to effectively evaluate and actively regulate and control in the process design stage in the existing method is solved.

The invention provides a plastic pipe service life test method and device, and the method comprises the steps: filling a low-level water tank and a circulation test pipeline communicated with the low-level water tank with a test solution, injecting the test solution into a high-level water tank communicated with the low-level water tank, and enabling the interior of the high-level water tank to have a preset test solution initial volume; wherein the high-level water tank is higher than the low-level water tank by a preset height, and a gas phase space is formed at the top of the high-level water tank; charging compressed gas into the gas-phase space to enable the gas-phase space of the high-level water tank to have preset pressure so as to apply back pressure to the test solution in the low-level water tank; under the back pressure condition, heating the test solution in the low-level water tank to a target test temperature; the backpressure condition and the target test temperature are maintained, and the service life of the plastic pipe sample in the circulation test pipeline is tested. Through the integrated structure and process design, the system is in a stable high-temperature and high-pressure test state, the energy utilization efficiency is improved, the operation cost is reduced, and the test efficiency is improved.

The application relates to a process design standard intelligent question and answer system and method based on a multi-modal large model and a GraphRAG, and belongs to the field of artificial intelligence and process design. The system intelligently analyzes a GB two-dimensional table picture through a multi-modal large model, extracts GB numbers, names, introductions and table data, and converts the same into a structured JSON format; a dynamic knowledge graph is constructed in combination with a graph database, efficient storage and association of process standard data are realized. Entities, attributes and digital parameters in a user question are extracted, a process standard path meeting a numerical interval requirement is accurately recalled based on a graph database path matching model, and finally a process design suggestion is generated through a large language model. The application significantly improves the intelligent level and standard compliance of process design, and has a wide application prospect in the fields of industrial manufacturing, mechanical processing, material processing and the like.

The invention belongs to the technical field of metallurgy, and particularly relates to steel for grinding balls with low cost and good wear resistance and a production method of the steel, and the steel comprises the following chemical components in percentage by weight: 0.72%-0.80% of C, 0.70%-0.80% of Mn, 0.70%-0.95% of Si, 0.70%-0.90% of Cr, less than or equal to 0.025% of S, less than or equal to 0.030% of P, 0.025%-0.040% of Alt and the balance of Fe and inevitable impurities. According to the method, the influence of carbon and all alloy elements on hardenability, hardenability, thermal conductivity, heat resistance and linear expansion coefficient is comprehensively considered, and through low-cost alloy design and process design, the flaw detection qualification rate of base metal round steel is increased, meanwhile, the surface hardness and the average volume hardness of the grinding balls are increased, hollow grinding balls are reduced, the wear resistance of the grinding balls is improved, and the cost is reduced.

The invention discloses 800MPa-grade high-strength steel and a production method thereof, and belongs to the technical field of metal materials. Manufacturing of the resource-friendly hot-rolled automobile steel plate is achieved through combination of component design and process design, the hot-rolled steel plate and the manufacturing process thereof are low in yield ratio and alloy content, meet the personalized use requirements of light-weight counter-weight commercial trucks, are suitable for automobile structures and have certain economical efficiency, the use amount of Nb, V and Ti alloy is saved, and the production cost is reduced. The alloy is suitable for square tubes, structural members and the like of commercial heavy trucks, reduces dependence on foreign alloys in China, increases the added value of products, and improves the competitiveness of the products.

The invention relates to the field of metal material processing, in particular to 610 MPa thin-gauge automobile steel and a preparation method thereof. The steel comprises chemical components in percentage by weight as follows: 0.04%-0.06% of C, 0.35%-0.45% of Si, 1.40%-1.50% of Mn, smaller than or equal to 0.050% of Als, 0.030%-0.050% of Nb, 0.25%-0.35% of Cr, smaller than or equal to 0.015% of P, smaller than or equal to 0.003% of S, smaller than or equal to 0.0050% of N and the balance of Fe and inevitable impurities. According to the invention, a ferrite and bainite structure is realized through combination of component design and process design, and high-strength, high-plasticity and high-surface-quality steel plate production is realized.

This invention discloses a system and method for extracting helium from natural gas. The system includes an air expander, a cooler, a cold box, and a helium purification system. The cold box includes a main heat exchanger, an air-liquid separator, and an LNG-liquid separator. The helium purification system includes an oxygen-addition and hydrogen-removal reactor, a helium purification system cooler, a helium purifier, a circulating compressor, a booster compressor, and a Dewar flask. The Dewar flask contains a heat exchanger, a gas-liquid separator, and an adsorber. This invention features a reasonable process design, simple equipment, and easy operation, achieving a helium extraction rate of up to 98%. By delivering methane to users in the form of LNG and using low-temperature adsorption to produce pure helium, the economic value of the product is improved.

The application is suitable for the technical field of electrochemical performance test, and provides a method for testing the electrocatalytic performance of a transition metal oxide film. The method comprises the steps of film sample pretreatment, test electrolyte preparation, electrochemical test system building, electrochemical test parameter setting, and test data processing and analysis. The application optimizes the key parameters and process design related to the test according to the characteristics of the transition metal oxide film, and realizes comprehensive and accurate evaluation of the electrocatalytic performance of the film. The test method has high standardization, clear operation process and good repeatability, and the test result is accurate and reliable and has good comparability. The application can provide a unified evaluation standard for the electrocatalytic performance of the transition metal oxide film for different research institutions, and provide a reliable basis for the performance evaluation and application research of the film, which is conducive to promoting the application research of the film in the field of new energy.

The application provides a coal quality improving and caking enhancing dust inhibitor and a preparation method thereof. Through synergistic effect of components, the coal quality improving and caking enhancing dust inhibitor can not only form a tough solidified film on the surface of coal, effectively inhibit dust flying and reduce coal loss, but also improve apparent calorific value of coal and improve coal quality through catalytic oxidation and pore filling mechanism. A composite wetting system can significantly reduce surface tension of a solution, and enhance the penetration and wrapping capacity of coal dust. A bonding system can form a solidified film with a three-dimensional network structure, and provide excellent wind erosion resistance and mechanical strength. Meanwhile, the quality improving and caking enhancing system can form a dense oxidation layer by catalyzing oxidation of light components on the surface of coal, and adsorb moisture, thereby reducing volatile loss and improving the calorific value of coal. In addition, the use of auxiliary components ensures the stability and environmental friendliness of the product under different environmental conditions. The preparation method is reasonable in process design, the product is stable in performance, and is suitable for industrial production.

The invention discloses a method for preparing deuterated methane from CO2RR, and relates to the technical field of deuterated methane. The method comprises the following steps: adding an electrolyte solution taking D2O as a solvent into a three-electrode flow cell, continuously introducing CO2 gas with the purity of more than 99.999%, and electrolyzing at normal temperature and normal pressure under the action of a catalyst. The preparation method provided by the invention realizes efficient synthesis of deuterated methane with high added value in a safe, low-cost and environment-friendly manner. By means of mild reaction conditions, simplified process design and successful application of a non-noble metal catalyst, a new normal form is provided for large-scale production of stable isotope labeled compounds, and the method particularly has wide application prospects in the fields of medicine synthesis, nuclear magnetic resonance tracing and the like needing high-purity deuterated methane.

This invention relates to the field of metal additive manufacturing, and more particularly to a pressure vessel steel powder for nuclear power plants and its preparation method. The pressure vessel steel powder comprises the following components: C: ≤0.2wt%; Si: 0.1-0.3wt%; Mn: 1.15-1.60wt%; S: ≤0.005wt%; Cr: ≤0.25wt%; Ni: 0.5-0.8wt%; P: ≤0.008wt%; Mo: 0.43-0.57wt%; V: ≤0.01wt%; Cu: ≤0.08wt%; Al: ≤0.04wt%; Co: ≤0.03wt%; with the balance being iron. This invention achieves precise control of the powder's chemical composition through targeted process design and impurity control strategies, ensuring that all performance indicators fully comply with the requirements of the "Design and Construction Rules for Mechanical Components of Pressurized Water Reactor Nuclear Island" standard.

The invention discloses a high-strength and high-elongation lining spring wire and a processing method thereof, and the processing method comprises the following steps: carrying out one-time continuous cold rolling on an SUS304 stainless steel raw wire, annealing, and cooling to obtain the high-strength and high-elongation lining spring wire. According to the method, the SUS304 stainless steel raw wire is subjected to annealing treatment after being subjected to one-time continuous cold rolling, original rolling state delivery of the lining spring wire is overturned, the tensile strength and the ductility are improved through optimization and innovation of process design and delivery in a state after heat treatment, and the method is suitable for production and machining of large-specification high-elasticity lining springs; cost waste caused by repeated rolling and solid solution is avoided, and the machining cost is saved.

The invention discloses a design method of a hinge type curved pipe pressure balance type expansion joint based on CAESAR II, and relates to the technical field of simulation of expansion joints in CAESAR II. The method comprises the steps that an expansion joint body pipe section of the hinge type curved pipe pressure balance type expansion joint is established in a CAESAR II according to initial design parameters, a hinge model comprising multiple sections of hinge plates connected in sequence is established in the radial direction of the expansion joint body pipe section, and a pin shaft is simulated by applying a first constraint to the connecting position of every two adjacent hinge plates, establishing a simulation model of the hinge type curved pipe pressure balance type expansion joint; performing displacement analysis on the simulation model to obtain an axial displacement value and a transverse displacement value; and updating the simulation model based on the process design parameters, and carrying out iteration. The technical problems that according to a traditional method, only a whole rigid body structure can be adopted for simple simulation, the real mechanical behavior of the expansion joint cannot be reflected, the displacement response of the expansion joint is seriously shifted from the actual physical state, and design of materials, structural parameters and the like of the expansion joint is not accurate are solved.

The invention belongs to the field of forging of high-temperature alloy rings, and particularly relates to a reverse temperature gradient preparation method of a low-residual-stress creep-resistant coarse-grain high-temperature alloy ring. According to the technical scheme, the method comprises the following steps that 1, the critical temperature TC and the critical time tC of grain growth are determined through an air burning test; 2, determining the critical deformation of the high-temperature alloy material for obtaining uniform fine grains and uniform coarse grains through a near-isothermal compression test of a bipyramid sample; 3, the high-temperature alloy bar is subjected to cake upsetting and punching; 4, low-temperature large-deformation pre-rolling is conducted; 5, high-temperature small-deformation finish rolling is conducted; and 6, bulging is conducted, specifically, the bulging heating temperature ranges from TC-30 DEG C to TC-80 DEG C, and the bulging deformation ranges from 1% to 4%. Through the inverse temperature gradient process design, a multi-scale structure of a coarse-grain low-residual-stress creep-resistant matrix and a high-density dislocation strengthening belt is constructed, and on the basis of ensuring the strength and rigidity, enough creep resistance and low residual stress are provided.

According to the gas inlet technology and device for the oxygen compressor in the nitrogen starting operation stage, normal-temperature nitrogen output by liquid nitrogen gasification equipment of an air separation device is designed to serve as a nitrogen source for the oxygen compressor in the nitrogen starting operation stage according to the gas inlet pressure and the flow design value of the oxygen compressor; by means of the adjusting functions of a liquid nitrogen pump frequency converter and a nitrogen pneumatic type conveying valve, the rotating speed of a liquid nitrogen pump is changed, the opening degree of the pneumatic type nitrogen conveying valve is adjusted, the normal-temperature nitrogen pressure and flow value of an outlet of a liquid nitrogen gasifier are adjusted to the oxygen compressor air inlet pressure and flow design value, and the nitrogen is conveyed to an oxygen compressor air inlet pipeline; according to the method, the problem of oxygen compressor operation condition deviation caused by the fact that the nitrogen inlet pressure value generated by using the low-pressure nitrogen and medium-pressure nitrogen inlet technology in the oxygen compressor nitrogen starting operation stage does not accord with the oxygen compressor air inlet pressure design value is solved, and the safety and stability of the oxygen compressor nitrogen starting operation stage are remarkably improved.

The invention belongs to the field of metal material processing engineering, and discloses a 450 MPa grade cold-rolled sheet for a household appliance panel and a production method of the 450 MPa grade cold-rolled sheet. The cold-rolled sheet comprises the following main chemical components in percentage by mass: 0.09%-0.13% of C, 0.01%-0.03% of Si, 0.40%-0.70% of Mn, less than or equal to 0.04% of P, less than or equal to 0.005% of S and the balance of Fe and inevitable impurity elements. Through reasonable chemical components and preparation process design, the cold-rolled sheet for the household appliance panel, which has excellent performances such as high strength and the like, good shape and lower cost, is produced.

This utility model discloses a desulfurization system for a coal-fired boiler, including a desulfurization tower connected to the flue gas duct of the coal-fired boiler via a flue gas inlet pipe. A wet electrostatic precipitator, an induced draft fan, and a chimney are sequentially installed on the flue gas outlet pipe behind the desulfurization tower. The desulfurization tower has multiple layers of spray pipes inside, and a slurry pool is located at the bottom of the tower. The slurry pool is connected to the spray pipes via a circulation pipe, which is equipped with a circulation pump. An oxidation pipe is connected to the top of the desulfurization tower, and an oxidation fan is installed on the oxidation pipe. A desulfurizing agent preparation mechanism is connected to the slurry pool at the bottom of the desulfurization tower. A slurry treatment mechanism is also connected to the bottom of the desulfurization tower via a pipe. This utility model optimizes process design, enhances material circulation, and implements precise parameter control. By utilizing spray layer atomization and forced oxidation by the oxidation fan, it ensures desulfurization effectiveness, improves the overall operating efficiency of the system, and enhances resource utilization through gypsum dewatering and filtrate recycling.