本文選題：硫化礦塵 + 熱分解反應(yīng)��； 參考：《江西理工大學(xué)》2017年碩士論文

【摘要】：高硫金屬礦井在開采作業(yè)過程中產(chǎn)生的礦塵在滿足一定條件下會(huì)導(dǎo)致爆炸事故,威脅人員與設(shè)備的安全,給礦山帶來巨大安全隱患。本文基于氣相爆炸機(jī)理,利用熱分析技術(shù)探討B(tài)(含硫20~30%)、C(含硫10~20%)、D(含硫10%)三類硫化礦塵熱穩(wěn)定性,以描述其發(fā)生爆炸的可能性,并根據(jù)粉塵爆炸熱力計(jì)算理論與方法計(jì)算硫化礦塵爆炸溫度,為防治硫化礦塵爆炸及評(píng)估其災(zāi)害程度提供理論基礎(chǔ)。具體研究?jī)?nèi)容如下:(1)闡明了硫化礦塵熱分解曲線特征及升溫速率對(duì)曲線的影響。硫化礦塵熱分解反應(yīng)分為受熱蒸發(fā)、礦物分解和產(chǎn)物分解三個(gè)階段。隨著升溫速率的加快,各類硫化礦塵熱分解反應(yīng)曲線受熱滯后現(xiàn)象的影響均有向高溫區(qū)飄移的趨勢(shì)。(2)獲得了各類硫化礦塵熱分解反應(yīng)中的“動(dòng)力學(xué)三因子”。通過Popescu法和Coats-Redfern法確定B、C、D三類硫化礦塵熱分解表觀活化能分別為160.57kJ/mol、183.44kJ/mol、142.58kJ/mol;指前因子分別為2.92×1010s-1、6.01×1011s-1、1.62×108s-1。(3)評(píng)價(jià)了各類硫化礦塵熱穩(wěn)定性。利用表觀活化能值大小作為判斷硫化礦塵熱穩(wěn)定性指標(biāo),并描述其發(fā)生爆炸的可能性,結(jié)果表明D類硫化礦塵熱穩(wěn)定性最差,發(fā)生礦塵爆炸的可能性最大,B類次之,C類最小。(4)獲得了硫化礦塵熱分解反應(yīng)活化熱力學(xué)函數(shù)。其值表明硫化礦塵在熱分解過程中過渡態(tài)結(jié)構(gòu)比硫化礦塵結(jié)構(gòu)緊湊;B、C類硫化礦塵反應(yīng)速率和熱抵抗能力一致,且比D類反應(yīng)速率要慢、熱抵抗能力要好。(5)分析了硫化礦塵爆炸強(qiáng)度隨質(zhì)量濃度變化規(guī)律。利用20L球形爆炸裝置測(cè)試結(jié)果表明在相同粒徑下,含硫量越大,最大爆炸壓力越大;所有種類硫化礦塵爆炸指數(shù)其均小于8MPa·m/s,按照爆炸烈度分級(jí)為St1級(jí),即爆炸性弱。(6)計(jì)算了硫化礦塵爆炸溫度。運(yùn)用粉塵爆炸熱力計(jì)算的理論與方法得到30gA類硫化礦塵爆炸產(chǎn)物中含有0.048mol2 3Fe O、0.01mol2 3 2Al O?2SiO、0.132mol2SO、0.03mol2CO、0.015mol2H O以及未反應(yīng)0.114mol2FeS,并采用線性內(nèi)插法求得理論爆炸溫度為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.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD714.5

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