Abstract—

Mathematical and computer-based models of a complex chemical-engineering roasting process as an interdependent plurality of three processes—drying, calcining, and sintering of moving, tight, and multilayered mass of phosphorite pellets in conveyer roasting machine, differing in attention to the intensity of processes of internal moisture transfer within the pellet and overwetting processes of separate horizons in heated pellet layer, have been developed, making it possible to the determine engineering parameters of the roasting mode. The adequacy of the mathematical model is checked from the comparative analysis data of calculated values of the moisture content and the temperature of pellets and parameters of heat-transfer gas, as well as moisture-transfer intensity in pellets when they are dried in the moving tight layer, were compared with the data of industrial testing. Numerous calculated experiments to determine the relative extent of drying, the moisture content, the intensity of pellet drying, and the moisture content of heat-transfer gas are carried out, in which crude pellets and the engineering data of the operating mode of a roasting machine have different parameters. An informal and mathematical statement of the problem of optimizing the chemical-energy engineering process (CEEP) for roasting the moving tight multilayered mass of phosphorite pellets within the complex chemical-energy engineering system (CEES) of the conveyer roasting machine is developed as the problem of discrete dynamic programming in light of spatiotemporal multistage processes for roasting the moving multilayered pellet mass, the intensity of the internal moisture transfer processes within the pellet, processes of overwetting the separate layers of pellets, and variables of the control stream of the heat-transfer gas; this makes it possible to enhance energy efficiency by means of intensifying heat-and-mass transfer processes of multilayered drying, calcining, and sintering. The performance criterion is the minimum cost of electrical and heat energy expended on the CEEP for roasting. The results were used to calculate energy efficient pellet roasting in CEES of the conveyer roasting machine. It has been found that, under the optimum mode of multilayered pellet roasting, there is no overwetting zone, processes of heat and moisture transfer are intensified, energy consumption decreases, and the quality of the end product increases. The problem of pellet overwetting in separate layer horizons of the drying zone of the roasting machine has been studied. The actual theoretical and practical problem of energy and resource saving in roasting pelletized crude ore in the tight layer has been solved. The mathematical model of heat-mass exchange in the pellet layer and testing its adequacy have been presented. The problem of optimizing power inputs based on the intensification of roasting processes has been solved.

中文翻译：

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磷矿石焙烧化学能源工程系统能源和资源效率管理中的自动化决策支持系统

摘要-

复杂化学工程焙烧过程的数学模型和基于计算机的模型，是相互依赖的三个过程的相互依存的三个过程-传送焙烧机中移动，紧密和多层磷矿颗粒的干燥，煅烧和烧结，但强度不同已经开发出颗粒内部水分转移过程和加热颗粒层中不同层的过度润湿过程的方法，从而可以确定焙烧模式的工程参数。根据对水分含量和球团温度的计算值以及传热气体参数以及球团在密闭状态下干燥时球团中的水分传递强度的比较分析数据，验证了数学模型的充分性。层，与工业测试数据进行了比较。为了确定干燥的相对程度，水分含量，颗粒干燥的强度以及传热气体的水分含量，进行了许多计算实验，其中粗粒料和焙烧机工作模式的工程数据有不同的参数。针对输送式焙烧机的复杂化学能工程系统（CEES）中开发的化学能工程工艺（CEEP）的优化问题进行非正式和数学陈述，以焙烧磷矿石球团的紧密紧密的多层团块时空多阶段焙烧移动多层颗粒团块的离散动态程序设计，丸粒内部水分传递过程的强度，丸粒的各层过湿的过程以及传热气体控制流的变量；通过加强多层干燥，煅烧和烧结的传热和传质过程，这可以提高能源效率。性能标准是CEEP花费在焙烧上的电能和热能的最低成本。结果用于计算输送机烘烤机的CEES中的节能颗粒烘烤。已经发现，在多层丸粒焙烧的最佳模式下，不存在过度润湿区，强化了热和水分传递的过程，降低了能量消耗，并且提高了最终产品的质量。已经研究了在烘烤机的干燥区的单独的层层中颗粒过湿的问题。解决了在紧实层中焙烧粒状粗矿石的节能和资源节约的实际理论和实践问题。提出了颗粒层中热质交换的数学模型并测试了其适当性。解决了基于烘烤过程的强化来优化功率输入的问题。