The paper presents an experimental and computational study of various regimes of firing coal-water fuel in a low-power hot-water boiler that enable both dry and liquid slag removal. The experimental studies were carried out on a pilot industrial boiler adapted for firing coal-water fuel. The fuel was prepared using flotation products of beneficiation of K grade hard coal. The experiments were accompanied by numerical modeling of combustion processes. The mathematical model includes description of the carrier phase motion (based on the RANS approach with the two-parameter Menter SST k-ω turbulence model), radiation transfer (based on the P1 approximation of the spherical harmonics method for a two-phase two-temperature gray medium), particle motion (based on the Lagrange approach), and gas phase combustion (based on a combination of the kinetic model of combustion of gas components with the vortex break model). The physico-mathematical model was tested on the problem of combustion of coal-water fuel (CWF). One of the goals of the work was verification of a complex mathematical model. A comparative analysis of the results of the numerical modeling and experimental data showed that the model reliably described the process of burning in a combustion chamber. An advanced design of hot-water boiler enabling regimes of both dry and liquid slag removal was investigated. The chamber was shown to provide the necessary conditions for firing CWF in terms of reliability and economy.

中文翻译：

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低功率热水锅炉中水煤燃料燃烧的数值模拟与实验分析

本文介绍了在低功率热水锅炉中燃烧水煤燃料的各种方式的实验和计算研究，该技术可同时去除干渣和液态渣。在适合于燃烧水煤燃料的中试工业锅炉上进行了实验研究。使用K级硬煤的选矿浮选产物制备燃料。实验伴随着燃烧过程的数值模拟。数学模型包括对载波相位运动的描述（基于带有两参数Menter SSTk -ω的RANS方法湍流模型），辐射传输（基于两相两温灰色介质的球谐函数的P1近似），粒子运动（基于拉格朗日方法）和气相燃烧（基于两种方法的组合）涡旋破坏模型的气体组分燃烧动力学模型）。针对水煤燃料（CWF）的燃烧问题测试了物理数学模型。这项工作的目标之一是验证复杂的数学模型。对数值模拟结果和实验数据的比较分析表明，该模型可靠地描述了燃烧室中的燃烧过程。对热水锅炉的先进设计进行了研究，该设计能够同时去除干渣和液态渣。