硫化矿尘热分解动力学及其爆温计算研究

发布时间：2018-05-05 08:42

本文选题：硫化矿尘 + 热分解反应　；参考：《江西理工大学》2017年硕士论文

【摘要】：高硫金属矿井在开采作业过程中产生的矿尘在满足一定条件下会导致爆炸事故,威胁人员与设备的安全,给矿山带来巨大安全隐患。本文基于气相爆炸机理,利用热分析技术探讨B(含硫20~30%)、C(含硫10~20%)、D(含硫10%)三类硫化矿尘热稳定性,以描述其发生爆炸的可能性,并根据粉尘爆炸热力计算理论与方法计算硫化矿尘爆炸温度,为防治硫化矿尘爆炸及评估其灾害程度提供理论基础。具体研究内容如下:(1)阐明了硫化矿尘热分解曲线特征及升温速率对曲线的影响。硫化矿尘热分解反应分为受热蒸发、矿物分解和产物分解三个阶段。随着升温速率的加快,各类硫化矿尘热分解反应曲线受热滞后现象的影响均有向高温区飘移的趋势。(2)获得了各类硫化矿尘热分解反应中的“动力学三因子”。通过Popescu法和Coats-Redfern法确定B、C、D三类硫化矿尘热分解表观活化能分别为160.57kJ/mol、183.44kJ/mol、142.58kJ/mol;指前因子分别为2.92×1010s-1、6.01×1011s-1、1.62×108s-1。(3)评价了各类硫化矿尘热稳定性。利用表观活化能值大小作为判断硫化矿尘热稳定性指标,并描述其发生爆炸的可能性,结果表明D类硫化矿尘热稳定性最差,发生矿尘爆炸的可能性最大,B类次之,C类最小。(4)获得了硫化矿尘热分解反应活化热力学函数。其值表明硫化矿尘在热分解过程中过渡态结构比硫化矿尘结构紧凑;B、C类硫化矿尘反应速率和热抵抗能力一致,且比D类反应速率要慢、热抵抗能力要好。(5)分析了硫化矿尘爆炸强度随质量浓度变化规律。利用20L球形爆炸装置测试结果表明在相同粒径下,含硫量越大,最大爆炸压力越大;所有种类硫化矿尘爆炸指数其均小于8MPa·m/s,按照爆炸烈度分级为St1级,即爆炸性弱。(6)计算了硫化矿尘爆炸温度。运用粉尘爆炸热力计算的理论与方法得到30gA类硫化矿尘爆炸产物中含有0.048mol2 3Fe O、0.01mol2 3 2Al O?2SiO、0.132mol2SO、0.03mol2CO、0.015mol2H O以及未反应0.114mol2FeS,并采用线性内插法求得理论爆炸温度为1282K。
[Abstract]:The dust produced in the mining process of high sulfur metal mine will lead to explosion accident under certain conditions, threaten the safety of personnel and equipment, and bring huge hidden danger to mine safety. Based on the mechanism of gas phase explosion, this paper discusses the thermal stability of three kinds of sulfide dust, B (sulfur containing 20C) and D (containing sulfur), by means of thermal analysis, in order to describe the possibility of explosion. According to the theory and method of thermal calculation of dust explosion, the explosion temperature of sulfide ore dust is calculated, which provides a theoretical basis for preventing the explosion of sulfide ore dust and evaluating its disaster degree. The specific research contents are as follows: (1) the characteristics of the pyrolysis curve of sulphide dust and the influence of heating rate on the curve are expounded. The pyrolysis of sulphide dust can be divided into three stages: heated evaporation, mineral decomposition and product decomposition. With the acceleration of heating rate, the thermal decomposition reaction curve of all kinds of sulphide ore dust is affected by the phenomenon of thermal hysteresis. All of them have the tendency to drift to the high temperature region.) the "dynamic three factors" in the thermal decomposition reaction of all kinds of sulphide dust have been obtained. The apparent activation energy of thermal decomposition of three kinds of sulphide ore dust was determined by Popescu method and Coats-Redfern method. The apparent activation energy was 160.57 kJ / mol ~ (-1) 183.44 kJ / mol ~ (-1) 142.58 kJ / mol, and the preexponential factor was 2.92 脳 10 ~ (10) s ~ (-1) 6.01 脳 10 ~ (11) s ~ (-1) and 1.62 脳 10 ~ (8) ~ (-1) 路mol ~ (-1) respectively) the thermal stability of all kinds of sulphide dust was evaluated. The apparent activation energy value is used to judge the thermal stability of sulphide dust and the possibility of explosion is described. The results show that the thermal stability of D type sulfide dust is the worst. The activation thermodynamic function of pyrolysis reaction of sulphide ore dust was obtained. The results show that the transition state structure of sulphide dust in the process of thermal decomposition is more compact than that of sulphide dust, and the reaction rate and thermal resistance of BU C type sulfide dust are consistent with those of D type sulfide dust, and the reaction rate is slower than that of D type sulfide dust. The variation of explosion strength with mass concentration of sulphide dust was analyzed. The test results of 20L spherical explosive device show that under the same particle size, the higher the sulphur content, the greater the maximum explosion pressure, and the explosion index of all kinds of sulphide dust is less than 8MPa m / s, and classified as St1 according to the explosion intensity. The explosion temperature of sulphide dust was calculated. By using the theory and method of thermal calculation of dust explosion, it is obtained that the explosion product of 30gA sulphide ore contains 0.048mol2 3Fe O _ (0. 01) mol _ (23) 2Al O _ (2) Sio _ (2) O _ (0.132) mol _ (2) so _ (2) O _ (0.03) mol _ (2) CO _ (2) O _ (0.015) mol _ (2H) O _ (0.015) mol _ (2) H _ O and unreacted 0.114 mol _ (2) FeS, and the theoretical explosion temperature is 1 82K by linear interpolation method.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD714.5

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