煤自然发火指标气体的关联性实验研究
发布时间：2019-06-01 15:39
【摘要】：在中国领域内除上海以外,其它各个省区或多或少均分布着煤炭资源,煤炭作为中国的基础能源,其在不可再生能源中占70%左右。然而煤矿开采和存储的过程中往往伴随着煤自燃,煤自燃已经是我国煤矿自然灾害较严重的灾害之一,不单会导致煤炭成本的浪费,并且更为严重的是给矿井工作职员带来致命性的事变,因此关于煤自燃的防治工作显得尤为重要。而长久实践看来,做好早期的预测预告是防治煤自燃的关键一步,煤自燃氧化过程中会产生一系列的气体,可以根据这些生成气体的浓度变化规律来反映出煤自燃的所处阶段,以便进行预测预报。可见煤自燃早期预测预告的核心就是确定合适的指标气体。本文选取了3类变质程度不同的煤作为实验研究对象,分别是褐煤、长焰煤和气煤,均为变质程度偏低的低阶煤,因为中国的低阶煤储量还是居多的,研究低阶煤的自燃特性更有实际意义。所选实验煤样具体为锡盟(XM)褐煤、神东(SD)长焰煤、白芦(BL)长焰煤、潞宁(LN)气煤。实验环节首先是对4种煤样分别进行程序升温氧化实验,通过实验数据的分析,同种煤的横向比较及同一气体的纵向比较得出单一相关指标气体随温度的变化规律,再加之对数据适当处理引入复合指标气体浓度与温度的相关性,通过曲线变化情况得出各煤样的指标气体种类。实验部分其次是对各煤样采用热重-差热分析技术来研究其自燃过程中的质热变化,进而确定出煤自燃的阶段。最后采用灰色斜率关联理论的方法结合热重-差热分析确定的阶段来进行加速氧化阶段指标气体的优选。本文得出的主要结论如下:(1)单一指标气体中,CO、H_2、C_2H_4、C_2H_2在等气体在升温过程中随温度的变化均表现出有规律的指数增长,故均可作为实验煤样早期预测预报的指标气体;特殊地C_2H_6可以作为褐煤和长焰煤的自燃指标气体来进行相关预测预报,不可以作为气煤的自燃指标气体来进行相关预测预报。(2)第一、二火灾系数随煤温的上升均呈现出规律性,一定程度上能反映煤自燃的程度,故可作为煤样的自燃指标气体来进行相关预测预报;而第三火灾系数3R在煤低温氧化期间出现有两次突变,具有较大的波动,故不宜作为煤样的自燃指标气体来进行相关预测预报。(3)对于褐煤和长焰煤而言,链烷比比值值超过0.15时应及时作出预警,故链烷比可以作为褐煤和长焰煤的指标气体,而不能作为气煤的指标气体;烯烷比及稀缺比可适当作为低阶煤的辅助指标来进行预测预报。(4)煤样在整个氧化过程中,煤样质量均呈现出如下变化趋势:先减小后增大,然后急剧下降最后趋于稳定;热量变化呈现出先升高再降低最后又升高的趋势。在挥发分蒸发阶段,4种煤样对应的T1=99.6~101.6℃;在吸氧阶段,4种煤样对应的T2=294.4~320.6℃,在煤受热分解阶段,4种煤样对应的T3为300.8~342.8℃,在燃烧阶段,除LN煤样在700℃时还未燃尽,其余3种煤样对应的T4为578.5~623.4℃。(5)通过综合对比,本文选取了灰色斜率关联模型进行定量分析,得出在煤自燃的加速氧化阶段,锡盟褐煤的综合指标预测体系如下:以2H、CO及42HC为主要指标气体,以442CHHC、第一火灾系数R1为辅助指标气体;神东长焰煤综合指标预测体系如下:以C_2H_6、442CHHC及2H为主要指标气体,以R2、C_2H_6/CH_4为辅助指标气体;白芦长焰煤综合指标预测体系如下:以C_2H_6/CH_4、R2及2H为主要指标气体,以442CHHC、C_2H_6为辅助指标气体;潞宁气煤综合指标预测体系如下:以442CHHC、R2及2H为主要指标气体,以CO、42HC为辅助指标气体。(6)煤的热解产物与煤的种类密切相关,选择指标气体时务必在实验的基础上进行,尽可能采用多种指标气体配合预报为宜。
[Abstract]:In the area of China, other than Shanghai, coal resources are distributed more or less in various provinces and regions, and coal is used as the basic energy source of China, accounting for about 70% of the non-renewable energy. However, in the process of coal mining and storage, the spontaneous combustion of coal is often accompanied by the spontaneous combustion of coal, which is one of the most serious natural disasters in the coal mine in China, which not only leads to the waste of the coal cost, but also causes a fatal incident to the staff of the mine. Therefore, the prevention and control of coal spontaneous combustion is very important. In the long-term practice, it is a critical step to prevent and control the spontaneous combustion of coal, and a series of gases can be generated during the spontaneous combustion and oxidation of the coal, and the phase of spontaneous combustion of the coal can be reflected according to the change law of the concentration of these generated gases, so as to carry out the prediction and prediction. The core of the early prediction of coal spontaneous combustion is to determine the appropriate indicator gas. In this paper, three kinds of coal with different degree of metamorphism are selected as experimental research object, which are lignite, long-flame coal and air-coal, which are low-rank coals with low degree of metamorphism. Because of the low-order coal reserves in China, it is more practical to study the auto-ignition characteristics of low-order coal. The selected experimental coal sample is a tin (XM) brown coal, a Shendong (SD) long flame coal, a white Lu (BL) long flame coal, and a Hanning (LN) gas coal. in that experiment, the temperature rise and oxidation experiment of four kinds of coal sample is carried out respectively, the change rule of the single correlation index gas with the temperature is obtained through the analysis of experimental data, the lateral comparison of the same coal and the longitudinal comparison of the same gas, In addition, the correlation between the gas concentration and the temperature of the composite index is introduced in the proper processing of the data, and the index gas species of each coal sample is obtained through the change of the curve. In the experimental part, the thermogravimetry-differential thermal analysis technique was used to study the thermal change of the coal in the spontaneous combustion process, and then the self-ignition phase of the coal was determined. At last, the method of grey slope correlation theory is used to combine the phase of the thermogravimetry and differential thermal analysis to carry out the optimization of the index gas in the accelerated oxidation stage. The main conclusions are as follows: (1) In the single-index gas, CO, H _ 2, C _ 2H _ 4 and C _ 2H _ 2 show a regular exponential increase in the temperature rise process, so that it can be used as an indicator gas for early prediction of coal-like samples. The special C _ 2H _ 6 can be used as the self-ignition index gas of the brown coal and the long-flame coal to carry out the related prediction and forecast, and the relevant prediction and prediction can not be carried out as the self-ignition index gas of the gas coal. and (2) the first and the second fire coefficients are regularly distributed along with the rise of the coal temperature, and the degree of spontaneous combustion of the coal can be reflected to a certain extent, so that the relevant prediction and prediction can be carried out as the self-ignition index gas of the coal sample, and the third fire coefficient 3R has two mutations during the low-temperature oxidation of the coal, It is not suitable to use the auto-ignition index gas as the coal-like auto-ignition index gas to forecast the related forecast. (3) For lignite and long-flame coal, when the ratio value of the alkane is more than 0.15, the early warning should be made in time, so the chain-alkane ratio can be used as the index gas of the lignite and the long-flame coal, and cannot be used as the indicator gas of the coal gas; The ratio of the ratio of alkylene and the ratio of scarcity can be used as the auxiliary index of low-order coal to forecast the prediction. (4) In the whole process of oxidation, the quality of the coal sample shows the following change trend: first decrease, then decrease sharply and finally stabilize; the change of heat shows the tendency of first increase and then decrease the final increase. In the phase of evaporation and evaporation, the corresponding T1 = 99.6 ~ 101.6 鈩，
本文编号：2490384
[Abstract]:In the area of China, other than Shanghai, coal resources are distributed more or less in various provinces and regions, and coal is used as the basic energy source of China, accounting for about 70% of the non-renewable energy. However, in the process of coal mining and storage, the spontaneous combustion of coal is often accompanied by the spontaneous combustion of coal, which is one of the most serious natural disasters in the coal mine in China, which not only leads to the waste of the coal cost, but also causes a fatal incident to the staff of the mine. Therefore, the prevention and control of coal spontaneous combustion is very important. In the long-term practice, it is a critical step to prevent and control the spontaneous combustion of coal, and a series of gases can be generated during the spontaneous combustion and oxidation of the coal, and the phase of spontaneous combustion of the coal can be reflected according to the change law of the concentration of these generated gases, so as to carry out the prediction and prediction. The core of the early prediction of coal spontaneous combustion is to determine the appropriate indicator gas. In this paper, three kinds of coal with different degree of metamorphism are selected as experimental research object, which are lignite, long-flame coal and air-coal, which are low-rank coals with low degree of metamorphism. Because of the low-order coal reserves in China, it is more practical to study the auto-ignition characteristics of low-order coal. The selected experimental coal sample is a tin (XM) brown coal, a Shendong (SD) long flame coal, a white Lu (BL) long flame coal, and a Hanning (LN) gas coal. in that experiment, the temperature rise and oxidation experiment of four kinds of coal sample is carried out respectively, the change rule of the single correlation index gas with the temperature is obtained through the analysis of experimental data, the lateral comparison of the same coal and the longitudinal comparison of the same gas, In addition, the correlation between the gas concentration and the temperature of the composite index is introduced in the proper processing of the data, and the index gas species of each coal sample is obtained through the change of the curve. In the experimental part, the thermogravimetry-differential thermal analysis technique was used to study the thermal change of the coal in the spontaneous combustion process, and then the self-ignition phase of the coal was determined. At last, the method of grey slope correlation theory is used to combine the phase of the thermogravimetry and differential thermal analysis to carry out the optimization of the index gas in the accelerated oxidation stage. The main conclusions are as follows: (1) In the single-index gas, CO, H _ 2, C _ 2H _ 4 and C _ 2H _ 2 show a regular exponential increase in the temperature rise process, so that it can be used as an indicator gas for early prediction of coal-like samples. The special C _ 2H _ 6 can be used as the self-ignition index gas of the brown coal and the long-flame coal to carry out the related prediction and forecast, and the relevant prediction and prediction can not be carried out as the self-ignition index gas of the gas coal. and (2) the first and the second fire coefficients are regularly distributed along with the rise of the coal temperature, and the degree of spontaneous combustion of the coal can be reflected to a certain extent, so that the relevant prediction and prediction can be carried out as the self-ignition index gas of the coal sample, and the third fire coefficient 3R has two mutations during the low-temperature oxidation of the coal, It is not suitable to use the auto-ignition index gas as the coal-like auto-ignition index gas to forecast the related forecast. (3) For lignite and long-flame coal, when the ratio value of the alkane is more than 0.15, the early warning should be made in time, so the chain-alkane ratio can be used as the index gas of the lignite and the long-flame coal, and cannot be used as the indicator gas of the coal gas; The ratio of the ratio of alkylene and the ratio of scarcity can be used as the auxiliary index of low-order coal to forecast the prediction. (4) In the whole process of oxidation, the quality of the coal sample shows the following change trend: first decrease, then decrease sharply and finally stabilize; the change of heat shows the tendency of first increase and then decrease the final increase. In the phase of evaporation and evaporation, the corresponding T1 = 99.6 ~ 101.6 鈩，
本文编号：2490384
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