“燃烧的条件”实验再改进

针对“燃烧的条件”实验存在的不足,通过分析文献和探索实践,提出新的改进方案。新方案遵循教材原型实验教学意图,利用燃烧匙、集气瓶、导管、气球、橡胶塞等物品,进行改进设计。改进后的实验具有装置简约、操作简便、效果显著等优点,同时结合实际对实验进行拓展探究,提出了比表面积、闪点等对物质燃烧有影响的因素,以帮助学生提升对燃烧知识的认识。

锅炉燃烧不完全的影响因素及解决措施

对锅炉来说,如果燃烧不完全会导致锅炉效率下降,影响舰艇续航力,该文从分析锅炉的燃烧过程出发引出影响锅炉燃烧的几个因素即燃油、供油设备和空气供给等,并详细阐述这些因素,最后提出了解决燃烧不完全的措施和建议。

木质结构建筑物火灾防控措施初探

受木质结构建筑物建筑结构不合理、建筑密集度较大、防火支撑设施不完整和可燃点较多等因素的影响,此类结构建筑物火灾普遍具有蔓延迅速、隐蔽性强以及覆盖面积相对较大等特点,其火灾隐患相比于其他种类的建筑类别明显更大。此外,环境、温度以及人为因素也是导致此类建筑发生火灾事故的重要因素。通过对木质结构建筑物内部的主要致灾因素进行逐一分析,结合该类建筑物的实际建筑特点,提出了通过完善木质结构建筑物内部防火结构、使用环保不易燃烧的建筑材料、进行外包防火处理、设立防火分区以及构建一体化的防火站、关联消防预警系统等相关措施有效提升木质结构建筑物的整体耐火等级,最大限度保障建筑物整体安全性与稳定性的有效提升。

Analysis and key control technologies to prevent spontaneous coal combustion occurring at a fully mechanized caving face with large obliquity in deep mines

In order to prevent spontaneous coal combustion occurring at a fully mechanized caving face with large obliquity in deep mines in China, we have analyzed the characteristics of spontaneous coal combustion and explain theoretically the factors affecting spontaneous coal combustion, such as rock bursts, high temperatures, high ventilation resistance, slow advancing speed and large obliquity mining. Key technologies to prevent spontaneous combustion occurring in sharply inclined seams in deep mines are pro- posed; these include pouring water, stopping leakage in upper and lower comers of the working face, choking off the goaf and cov- eting the coal. CO concentrations were controlled within two years to less than 15×10^-6 at the upper comer by applying these tech- nologies at the 1410 working face of the Huafeng coal mine. Our method has significant theoretical value and is of practical impor- tance in controlling spontaneous coal combustion occurring at a fully mechanized caving face with large obliquity in deep mines.

Experimental research on combustion fluorine retention using calcium-based sorbets during coal combustion(Ⅰ)

In order to provide experimental guide to commercial use of fluorine pollution control during coal combustion, with fluorine pollution control during coal combustion in mind, this paper proposed the theory of combustion fluorine retention technology. Feasibility of fluorine retention reaction with calcium-based fluorine retention agent was analyzed through thermo-dynamic calculation during coal combustion. By simulating the restraining and retention effects and influential factors of calcium-based sorbets on vaporized fluoride during experimental combustion using fixed bed tube furnace, the paper systematically explored the influential law of such factors as combustion temperature, retention time, and added quantities of calcium-based sorbets on effects of fluorine retention. The research result shows that adding calcium-based fluorine retention agent in coal combustion has double effects of fluorine retention and sulfur retention, it lays an experimental foundation for commercial test of combustion fluorine retention.

STUDY ON MAJOR FACTORS INFLUENCINGSPONTANEOUS COMBUSTION OF COAL

This paper theoretically analyzes major factors influencing spontaneous combustion of coal, such as molecule structure of coal, porosity, temperature, concentration of oxygen, coal thickness, velocity of face advance, and so on; and probes into how they affect the process of spontaneous combustion of coal, which is of momentous significance to predict or control self ignition of coal.