本文選題：井巷圍巖 + 調(diào)熱能力��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：隨著礦井開(kāi)采深度的加大,高溫?zé)岷?wèn)題日益突出。國(guó)內(nèi)高溫礦井熱害防治普遍采用制冷降溫系統(tǒng),而且多數(shù)制冷設(shè)備從國(guó)外引進(jìn),降溫費(fèi)用較高。同時(shí),普通礦井具有的“冬暖夏涼”現(xiàn)象表明井巷圍巖對(duì)風(fēng)流具有明顯的熱調(diào)節(jié)作用。掌握圍巖對(duì)風(fēng)流熱調(diào)節(jié)規(guī)律是制定經(jīng)濟(jì)高效降溫方案的基礎(chǔ),因此對(duì)井巷圍巖調(diào)熱能力大小進(jìn)行研究有重要意義。研究了入口風(fēng)溫變化下井巷圍巖調(diào)熱能力數(shù)值求解模型。采用有限差分法,在井巷軸向和徑向上劃分單元,通過(guò)時(shí)間離散為軸向單元入口引入以時(shí)間序列記錄的風(fēng)溫值,以此建立了入口風(fēng)溫變化下井巷圍巖溫度場(chǎng)數(shù)值求解模型,采用C#語(yǔ)言開(kāi)發(fā)了相應(yīng)的軟件,該軟件可進(jìn)行井巷圍巖對(duì)風(fēng)流調(diào)熱能力模擬研究。模擬研究了井巷圍巖調(diào)熱能力及調(diào)熱能力影響因素。利用開(kāi)發(fā)的井巷圍巖溫度場(chǎng)模擬軟件,模擬了入口風(fēng)溫變化下井巷圍巖溫度場(chǎng),分析了圍巖溫度場(chǎng)的變化規(guī)律,得出了井巷圍巖溫度場(chǎng)兩區(qū)分布的真實(shí)結(jié)構(gòu):在圍巖徑向淺部(1區(qū)),圍巖溫度隨季節(jié)波動(dòng);在圍巖徑向深部(2區(qū)),圍巖溫度隨徑向深度的延伸不斷升高,直至趨近于原始巖溫。進(jìn)一步開(kāi)展了井巷圍巖調(diào)熱能力影響因素研究,得出地面氣溫年變化幅度、井深、圍巖導(dǎo)溫系數(shù)和風(fēng)量對(duì)井巷圍巖調(diào)熱能力的影響規(guī)律,結(jié)果表明:地面氣溫年變化幅度和井深對(duì)井巷圍巖調(diào)熱能力影響顯著;圍巖導(dǎo)溫系數(shù)是影響井巷圍巖調(diào)熱能力不容忽視的因素;風(fēng)量對(duì)井巷圍巖調(diào)熱能力影響甚微。建立了濟(jì)三煤礦井口全風(fēng)量降溫?zé)岷Ψ乐蜗到y(tǒng)。通過(guò)分析濟(jì)三煤礦熱害現(xiàn)狀,模擬井巷圍巖調(diào)熱能力,為礦井熱害治理擬定方案并提供依據(jù),結(jié)果表明:一年內(nèi)副井圍巖累積散熱量比吸熱量多726477MJ,在12月圍巖散熱量最大,在6月圍巖吸熱量最大,換熱量最值出現(xiàn)的時(shí)刻早于地面氣溫最值出現(xiàn)的時(shí)刻;采用井口全風(fēng)量降溫后,有效地緩解了夏季高溫?zé)岷ΜF(xiàn)象,副井圍巖溫度場(chǎng)兩區(qū)分布特征消失,隨著通風(fēng)時(shí)間的延長(zhǎng),圍巖調(diào)熱圈半徑逐漸向深部擴(kuò)展,通風(fēng)一段時(shí)間后,井底圍巖調(diào)熱圈半徑基本不變,圍巖向風(fēng)流散熱量逐漸減小,副井風(fēng)流溫升減小,井口全風(fēng)量降溫效果明顯;當(dāng)濟(jì)三煤礦開(kāi)采深度為1000m時(shí),井底圍巖溫度場(chǎng)兩區(qū)分布特征消除,圍巖對(duì)風(fēng)流熱調(diào)節(jié)能力減弱,井底圍巖溫度不再受入口風(fēng)溫變化的影響,達(dá)到此開(kāi)采深度,高溫?zé)岷κ艿販赜绊懜黠@,此種情況下可考慮采用井下集中制冷降溫方式治理熱害。
[Abstract]:With the increase of mining depth, the problem of high temperature heat damage is becoming more and more serious. Refrigeration and cooling system is widely used in the prevention and cure of thermal hazard in domestic high temperature mine. Most refrigeration equipments are imported from abroad, and the cooling cost is high. At the same time, the phenomenon of "warm in winter and cool in summer" in ordinary mines indicates that surrounding rock of roadway has obvious heat regulating effect on air flow. It is important to study the heat regulation ability of surrounding rock in roadway because it is the basis of economic and efficient cooling scheme to master the heat regulation law of surrounding rock to wind flow. The numerical model of heat regulation capacity of surrounding rock under the change of inlet wind temperature is studied. The finite difference method is used to divide the units in the axial and radial direction of the shaft and roadway. By introducing the wind temperature recorded by time series into the inlet of the axial unit, a numerical solution model of the surrounding rock temperature field of the roadway under the change of the inlet air temperature is established. The corresponding software is developed by using C # language. The software can be used to simulate the heat regulation ability of surrounding rock of shaft and roadway to air flow. The heat regulation capacity of surrounding rock and its influencing factors were simulated. Using the developed simulation software of surrounding rock temperature field, the temperature field of surrounding rock under the change of inlet wind temperature is simulated, and the variation law of surrounding rock temperature field is analyzed. The true structure of the temperature field distribution of surrounding rock is obtained: the temperature of surrounding rock fluctuates with the season in the radial shallow part of surrounding rock (area 1), and in the radial depth of surrounding rock (area 2), the temperature of surrounding rock increases continuously with the extension of radial depth, until it approaches the temperature of original rock. The influencing factors of heat regulation capacity of surrounding rock are further studied, and the effects of annual variation of surface temperature, depth of well, coefficient of surrounding rock temperature conductivity and air volume on the heat regulation capacity of surrounding rock are obtained. The results show that the annual variation of surface air temperature and the depth of the well have a significant effect on the heat regulation capacity of the surrounding rock, the thermal conductivity coefficient of the surrounding rock is the factor that can not be ignored, and the air volume has little effect on the heat regulation ability of the surrounding rock. A system for preventing and controlling thermal damage caused by total air volume cooling at the well head of Jisan Coal Mine is established. By analyzing the present situation of heat damage in the third coal mine, simulating the heat regulation capacity of surrounding rock in the shaft and roadway, the scheme of heat damage control is drawn up and the basis is provided. The results show that the accumulated heat loss of surrounding rock of auxiliary shaft is 726477MJ more than that of heat absorption in one year, and the heat dissipation of surrounding rock is the largest in December. The maximum heat absorption of surrounding rock in June is earlier than that of surface temperature, and the phenomenon of high temperature damage in summer can be effectively alleviated by adopting the total air volume at the well head, and the distribution characteristics of temperature field in the surrounding rock of auxiliary well are disappeared. With the extension of ventilation time, the radius of the surrounding rock heat regulating circle gradually extends to the deep. After ventilation for a period of time, the radius of the surrounding rock heat regulating circle is basically unchanged, the heat emission from surrounding rock to air flow decreases gradually, and the air flow temperature of auxiliary well decreases. When the mining depth of the third coal mine is 1000m, the temperature field distribution in the bottom rock is eliminated, the heat regulation ability of the surrounding rock to the wind flow is weakened, and the temperature of the bottom rock is no longer affected by the change of the inlet wind temperature. To reach this mining depth, the high temperature heat damage is affected more obviously by the ground temperature. In this case, the underground centralized cooling and cooling method can be considered to control the heat damage.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD727.2

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