煤自然發(fā)火指標(biāo)氣體的關(guān)聯(lián)性實(shí)驗(yàn)研究
發(fā)布時(shí)間：2019-06-01 15:39
【摘要】：在中國(guó)領(lǐng)域內(nèi)除上海以外,其它各個(gè)省區(qū)或多或少均分布著煤炭資源,煤炭作為中國(guó)的基礎(chǔ)能源,其在不可再生能源中占70%左右。然而煤礦開采和存儲(chǔ)的過(guò)程中往往伴隨著煤自燃,煤自燃已經(jīng)是我國(guó)煤礦自然災(zāi)害較嚴(yán)重的災(zāi)害之一,不單會(huì)導(dǎo)致煤炭成本的浪費(fèi),并且更為嚴(yán)重的是給礦井工作職員帶來(lái)致命性的事變,因此關(guān)于煤自燃的防治工作顯得尤為重要。而長(zhǎng)久實(shí)踐看來(lái),做好早期的預(yù)測(cè)預(yù)告是防治煤自燃的關(guān)鍵一步,煤自燃氧化過(guò)程中會(huì)產(chǎn)生一系列的氣體,可以根據(jù)這些生成氣體的濃度變化規(guī)律來(lái)反映出煤自燃的所處階段,以便進(jìn)行預(yù)測(cè)預(yù)報(bào)�？梢娒鹤匀荚缙陬A(yù)測(cè)預(yù)告的核心就是確定合適的指標(biāo)氣體。本文選取了3類變質(zhì)程度不同的煤作為實(shí)驗(yàn)研究對(duì)象,分別是褐煤、長(zhǎng)焰煤和氣煤,均為變質(zhì)程度偏低的低階煤,因?yàn)橹袊?guó)的低階煤儲(chǔ)量還是居多的,研究低階煤的自燃特性更有實(shí)際意義。所選實(shí)驗(yàn)煤樣具體為錫盟(XM)褐煤、神東(SD)長(zhǎng)焰煤、白蘆(BL)長(zhǎng)焰煤、潞寧(LN)氣煤。實(shí)驗(yàn)環(huán)節(jié)首先是對(duì)4種煤樣分別進(jìn)行程序升溫氧化實(shí)驗(yàn),通過(guò)實(shí)驗(yàn)數(shù)據(jù)的分析,同種煤的橫向比較及同一氣體的縱向比較得出單一相關(guān)指標(biāo)氣體隨溫度的變化規(guī)律,再加之對(duì)數(shù)據(jù)適當(dāng)處理引入復(fù)合指標(biāo)氣體濃度與溫度的相關(guān)性,通過(guò)曲線變化情況得出各煤樣的指標(biāo)氣體種類。實(shí)驗(yàn)部分其次是對(duì)各煤樣采用熱重-差熱分析技術(shù)來(lái)研究其自燃過(guò)程中的質(zhì)熱變化,進(jìn)而確定出煤自燃的階段。最后采用灰色斜率關(guān)聯(lián)理論的方法結(jié)合熱重-差熱分析確定的階段來(lái)進(jìn)行加速氧化階段指標(biāo)氣體的優(yōu)選。本文得出的主要結(jié)論如下:(1)單一指標(biāo)氣體中,CO、H_2、C_2H_4、C_2H_2在等氣體在升溫過(guò)程中隨溫度的變化均表現(xiàn)出有規(guī)律的指數(shù)增長(zhǎng),故均可作為實(shí)驗(yàn)煤樣早期預(yù)測(cè)預(yù)報(bào)的指標(biāo)氣體;特殊地C_2H_6可以作為褐煤和長(zhǎng)焰煤的自燃指標(biāo)氣體來(lái)進(jìn)行相關(guān)預(yù)測(cè)預(yù)報(bào),不可以作為氣煤的自燃指標(biāo)氣體來(lái)進(jìn)行相關(guān)預(yù)測(cè)預(yù)報(bào)。(2)第一、二火災(zāi)系數(shù)隨煤溫的上升均呈現(xiàn)出規(guī)律性,一定程度上能反映煤自燃的程度,故可作為煤樣的自燃指標(biāo)氣體來(lái)進(jìn)行相關(guān)預(yù)測(cè)預(yù)報(bào);而第三火災(zāi)系數(shù)3R在煤低溫氧化期間出現(xiàn)有兩次突變,具有較大的波動(dòng),故不宜作為煤樣的自燃指標(biāo)氣體來(lái)進(jìn)行相關(guān)預(yù)測(cè)預(yù)報(bào)。(3)對(duì)于褐煤和長(zhǎng)焰煤而言,鏈烷比比值值超過(guò)0.15時(shí)應(yīng)及時(shí)作出預(yù)警,故鏈烷比可以作為褐煤和長(zhǎng)焰煤的指標(biāo)氣體,而不能作為氣煤的指標(biāo)氣體;烯烷比及稀缺比可適當(dāng)作為低階煤的輔助指標(biāo)來(lái)進(jìn)行預(yù)測(cè)預(yù)報(bào)。(4)煤樣在整個(gè)氧化過(guò)程中,煤樣質(zhì)量均呈現(xiàn)出如下變化趨勢(shì):先減小后增大,然后急劇下降最后趨于穩(wěn)定;熱量變化呈現(xiàn)出先升高再降低最后又升高的趨勢(shì)。在揮發(fā)分蒸發(fā)階段,4種煤樣對(duì)應(yīng)的T1=99.6~101.6℃;在吸氧階段,4種煤樣對(duì)應(yīng)的T2=294.4~320.6℃,在煤受熱分解階段,4種煤樣對(duì)應(yīng)的T3為300.8~342.8℃,在燃燒階段,除LN煤樣在700℃時(shí)還未燃盡,其余3種煤樣對(duì)應(yīng)的T4為578.5~623.4℃。(5)通過(guò)綜合對(duì)比,本文選取了灰色斜率關(guān)聯(lián)模型進(jìn)行定量分析,得出在煤自燃的加速氧化階段,錫盟褐煤的綜合指標(biāo)預(yù)測(cè)體系如下:以2H、CO及42HC為主要指標(biāo)氣體,以442CHHC、第一火災(zāi)系數(shù)R1為輔助指標(biāo)氣體;神東長(zhǎng)焰煤綜合指標(biāo)預(yù)測(cè)體系如下:以C_2H_6、442CHHC及2H為主要指標(biāo)氣體,以R2、C_2H_6/CH_4為輔助指標(biāo)氣體;白蘆長(zhǎng)焰煤綜合指標(biāo)預(yù)測(cè)體系如下:以C_2H_6/CH_4、R2及2H為主要指標(biāo)氣體,以442CHHC、C_2H_6為輔助指標(biāo)氣體;潞寧氣煤綜合指標(biāo)預(yù)測(cè)體系如下:以442CHHC、R2及2H為主要指標(biāo)氣體,以CO、42HC為輔助指標(biāo)氣體。(6)煤的熱解產(chǎn)物與煤的種類密切相關(guān),選擇指標(biāo)氣體時(shí)務(wù)必在實(shí)驗(yàn)的基礎(chǔ)上進(jìn)行,盡可能采用多種指標(biāo)氣體配合預(yù)報(bào)為宜。
[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，
本文編號(hào)：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，
本文編號(hào)：2490384
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