本文選題：煤自燃　切入點：稠化膠體　出處：《中國礦業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：注漿是我國煤炭開采行業(yè)常用的防滅火措施,針對注漿技術(shù)耗水量較大、漿液輸送過程常發(fā)生堵管的缺點,開發(fā)了一種新型稠化膠體材料,該材料能在較低的水固比下對黃土等固相介質(zhì)實現(xiàn)長期穩(wěn)定懸浮,并具有剪切稀化特性,利于管路輸送。本文通過實驗研究和理論分析、計算,對這一新型稠化膠體的特性進(jìn)行了系統(tǒng)研究,取得了以下研究成果:(1)稠化膠體由天然多糖DG與纖維素醚HD溶于水形成的復(fù)配膠體與黃土混合而成,開展了稠化膠體的黃土懸浮特性實驗,結(jié)果發(fā)現(xiàn):稠化膠體具有最優(yōu)懸浮能力的臨界復(fù)配膠體濃度為0.4%,該濃度下稠化膠體能懸浮任意高于1:1水土比條件的黃土,且在pH值接近7.5時具有最佳懸浮性能。稠化膠體能使黃土長期穩(wěn)定懸浮的原因,一方面是膠體中的DG成分能與Ca2+螯合交聯(lián)形成三維網(wǎng)狀結(jié)構(gòu),HD成分可起到協(xié)同增粘作用,從而將黃土顆粒牢牢束縛在膠體的網(wǎng)狀結(jié)構(gòu)中,另一方面DG、HD分子在黃土顆粒表面的吸附,使黃土顆粒間的斥力位能升高,吸力位能下降,以致顆粒的布朗運動不能克服體系的位壘和顆粒間的斥力而聚集。(2)利用流變儀開展了稠化膠體的流變特性實驗,結(jié)果發(fā)現(xiàn):當(dāng)天然多糖DG與纖維素醚HD的質(zhì)量比為5:5時,復(fù)配膠體粘度最大,遂將該比例確定為稠化膠體的成膠材料配比;分析復(fù)配膠體的流變特性曲線后,確定復(fù)配膠體為屈服假塑性流體,在0.4%濃度下其流變本構(gòu)模型為τ = 0.078 + 2.740γ·0.00427;系統(tǒng)測試了復(fù)配膠體的粘彈性,結(jié)果表明復(fù)配膠體屬于粘彈性固體,且趨近于彈性體,較單一的DG膠體具有更寬的線性粘彈區(qū)和更強的結(jié)構(gòu)穩(wěn)定性,其結(jié)構(gòu)一旦受到剪切破壞,在5s內(nèi)的結(jié)構(gòu)恢復(fù)率為43.3%,最終結(jié)構(gòu)恢復(fù)率為76.0%;不同水土比的稠化膠體,其剪切應(yīng)力曲線隨剪切速率增長均為先下降后上升,稠化膠體的粘度和屈服應(yīng)力隨黃土比例的升高而升高,水土比為3:1、4:1的稠化膠體流變本構(gòu)模型依次為τ=25.15 + 2.377γ·0.663、τ = 14.02+ 2.054γ0.583;建立了以連續(xù)相粘度和分散相體積分?jǐn)?shù)為參數(shù)的稠化膠體粘度預(yù)測模型η=10-8.93 58+8.4157Φ+8.6781η0.0051,且預(yù)測值與實際值吻合良好;稠化膠體分別在DN100、DN125鋼管中以30m3/h的流量流動時,其千米管路壓降分別為1.203Mpa、0.778Mpa。(3)開展了稠化膠體防治煤自燃特性實驗,結(jié)果表明:稠化膠體能使堵漏風(fēng)測試裝置的真空腔體負(fù)壓維持在-14.6kPa,堵漏風(fēng)效果優(yōu)于煤矸石填充和膠帶密封;覆蓋稠化膠體材料后,隱蔽高溫火源中心溫度在20s內(nèi)由446.5℃迅速下降到44.5℃,上方3cm處溫度在20s內(nèi)由185.2℃迅速下降到25.4℃;稠化膠體對煤火的降溫能力和降溫穩(wěn)定性均高于黃泥漿,原因是稠化膠體的保水性更好;在煤的氧化升溫過程中,稠化膠體處理煤樣相比原煤,CO釋放量顯著降低,交叉點溫度提高了 50℃以上,稠化膠體對測試煤樣具有良好的阻化效果;常溫下稠化膠體處理煤樣相對原煤-OH、-COOH含量分別增長了 3%、2.2%,C=O、C-O、取代苯含量則分別降低了 0.6%、1.5%、2.5%,脂肪烴和芳烴C=C變化量在0.2%以內(nèi);在煤氧化升溫過程中,稠化膠體處理煤樣相比原煤,脂肪烴、C-O、C=O、-COOH含量變化速率不同程度的減慢,-OH含量變化速率加快,-COO含量變化速率則無明顯改變。
[Abstract]:Grouting is China's coal mining industry commonly used fire prevention measures, the grouting technology consumes large amount of water slurry conveying process often occurs plugging the disadvantages, the development of a new type colloidal gel material, the material in the lower water solid ratio of loess. The solid medium for the long-term stability of suspension, and with shear thinning characteristics, for pipeline transportation. This paper through experimental study and theoretical analysis, calculation, characteristics of this new type of thickening colloid were studied, and the following results are obtained: (1) the dense colloid composed of natural polysaccharides DG and HD cellulose ether soluble in water to form the compound colloid and loess mixture as the suspension experiment, colloidal gel showed that: the critical concentration of colloidal compound thickening colloid has the best suspension capacity is 0.4%, the concentration of colloidal thickening under arbitrary suspension is higher than that of 1:1 ratio in Loess soil, And in the pH value with the best suspension performance is close to 7.5. The dense colloid can make the Loess long steady suspension of reason, one is the DG component in the colloid to form a three-dimensional network structure with Ca2+ chelating HD components, can play a synergistic thickening function, thus the Loess particles bound in the gel network structure on the other hand, DG, HD molecular adsorption on the surface of the Loess loess particles, the interparticle repulsive potential increased, suction potential decreased, so that Brown cannot overcome the barrier of the movement of particles and particle system repulsion and aggregation. (2) the rheological experiment, thickening colloid by rheology instrument results when the DG natural polysaccharide and cellulose ether HD mass ratio was 5:5, the largest proportion of the viscosity of colloidal compound, then determine the proportion of adhesive materials for thickening colloid; rheological properties of colloidal compound curve after determination of colloidal compound To yield pseudoplastic fluid, in 0.4% under the concentration of the rheological constitutive model for R = 0.078 + 2.740 gamma - 0.00427; system test of the viscoelastic colloidal compound, results show that the colloidal compound belongs to viscoelastic solids, and close to the elastic body structure stability than single DG colloid has wider linear viscoelastic and more, the structure when subjected to shear failure, the structure within the 5S recovery rate was 43.3%, the final structure recovery rate was 76%; the dense colloid of different soil ratio, the shear stress curve with the shear rate increase was decreased and then increased, increased thickening gel viscosity and yield stress with the increasing proportion of loess soil, ratio of colloidal gel rheological constitutive model of 3:1,4:1 in =25.15 + 2.377 - gamma tau 0.663, tau = 2.054 14.02+ gamma 0.583; forecast is established by using continuous phase viscosity and volume fraction of dispersed phase parameters of colloidal gel viscosity Model =10-8.93 58+8.4157 +8.6781 ETA Phi ETA 0.0051, and the predicted values are in good agreement with the actual value; the dense colloid respectively in DN100, DN125 pipe to flow 30m3/h, the km pipeline pressure drop were 1.203Mpa, 0.778Mpa. (3) carried out a colloidal gel for prevention of coal spontaneous combustion characteristics of the experiment, the results show that the thickening the colloidal plugging test device of vacuum chamber pressure maintained at -14.6kPa. The plugging effect is better than that of coal gangue filling and sealing tape; covering the dense colloid material, hidden high temperature fire center temperature within 20s from 446.5 DEG C decreased rapidly at 44.5 degrees above the temperature at 3cm in 20s dropped to 25.4 from 185.2 DEG C C; cooling capacity of coal thickening colloid and cooling stability were higher than that of yellow mud, because the water better thickening colloid; in coal oxidation process, dense colloid coal than coal, the release amount of CO Significantly, the junction temperature increased above 50 DEG C, thickening colloid has good effect on the resistance test of coal samples under normal temperature; the dense colloid coal coal relative -OH, -COOH content increased by 3%, 2.2%, C=O, C-O, substituted benzene content were reduced by 0.6%, 1.5%, 2.5%. Fatty hydrocarbon and aromatic hydrocarbon C=C variation was less than 0.2%; in coal oxidation process, dense colloid coal than coal, aliphatic hydrocarbons, C-O, C=O, slow down the rate of change of -COOH content in different degree, the change rate of -OH was accelerated, rate of change of -COO content has no obvious change.

【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD752.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 范翠杰;劉來源;;瓜爾豆膠在石油開采中的應(yīng)用及成本分析[J];新疆農(nóng)墾科技;2015年04期

2 劉通義;于毅;趙眾從;陳光杰;;一種含甜菜堿型單體的締合型稠化劑的合成及性能評價[J];應(yīng)用化工;2015年02期

3 王寅;王海暉;;基于交叉點溫度法煤自燃傾向性評定指標(biāo)的物理內(nèi)涵[J];煤炭學(xué)報;2015年02期

4 趙建會;張辛亥;;礦用灌漿注膠防滅火材料流動性能的實驗研究[J];煤炭學(xué)報;2015年02期

5 邱小慶;高志軍;李嘉瑞;楊文波;;一種新型線性膠壓裂液的室內(nèi)評價及應(yīng)用[J];長江大學(xué)學(xué)報(自科版);2015年04期

6 徐金覃;尹琳;陸現(xiàn)彩;;瓜爾豆膠對凹凸棒石黏土膠體黏度的影響[J];非金屬礦;2015年01期

7 金永飛;李海濤;馬蓉;趙先科;;輸送稠化膠體管道彎管段流固耦合數(shù)值模擬[J];煤礦安全;2015年01期

8 王亞南;陸麗;劉臘梅;;高效低傷害瓜膠壓裂液體系在蘇里格的應(yīng)用[J];天然氣技術(shù)與經(jīng)濟(jì);2014年06期

9 張東華;汪慶平;駱桂英;;魔芋膠與瓜膠未來產(chǎn)業(yè)競爭態(tài)勢分析[J];熱帶農(nóng)業(yè)科學(xué);2014年12期

10 郭萬忠;金永飛;李海濤;;高摻量粉煤灰漿液稠化懸浮特性實驗研究[J];煤炭技術(shù);2014年12期

相關(guān)博士學(xué)位論文 前5條

1 張雷林;防治煤自燃的凝膠泡沫及特性研究[D];中國礦業(yè)大學(xué);2014年

2 戚緒堯;煤中活性基團(tuán)的氧化及自反應(yīng)過程[D];中國礦業(yè)大學(xué);2011年

3 徐永亮;防治煤自燃的懸砂膠體研究[D];中國礦業(yè)大學(xué);2011年

4 謝甜甜;膠態(tài)成型固化特性及其應(yīng)用技術(shù)研究[D];華中科技大學(xué);2009年

5 田兆君;煤礦防滅火凝膠泡沫的理論與技術(shù)研究[D];中國礦業(yè)大學(xué);2009年

相關(guān)碩士學(xué)位論文 前10條

1 劉海祥;石墨烯/海藻酸納復(fù)合材料的制備及其性能研究[D];青島大學(xué);2014年

2 王乃玲;含碳酸鹽混合磁選精礦分散浮選技術(shù)研究[D];東北大學(xué);2013年

3 賈宇龍;鋁溶膠的制備及結(jié)構(gòu)性能[D];武漢理工大學(xué);2012年

4 姜楠;羧甲基羥丙基瓜爾膠的合成及性能[D];沈陽工業(yè)大學(xué);2012年

5 李濤;水泥復(fù)合膠體充填加固冒落巷道實驗研究與應(yīng)用[D];西安科技大學(xué);2011年

6 王楠;煤自然發(fā)火膠體防滅火材料性能實驗研究[D];西安科技大學(xué);2011年

7 呂彥清;水基壓裂液添加劑的研究與應(yīng)用[D];蘭州理工大學(xué);2011年

8 劉加勛;燃煤飛灰化學(xué)團(tuán)聚實驗研究及機(jī)理分析[D];哈爾濱工業(yè)大學(xué);2008年

9 徐彬;三元復(fù)合驅(qū)采出液分散相油滴聚并機(jī)理研究[D];天津大學(xué);2008年

10 顧宏新;羧甲基羥丙基瓜爾膠的制備與表征[D];四川大學(xué);2007年

，

本文編號：1585694