本文選題：選煤廠(chǎng) + 煤倉(cāng)　； 參考：《太原理工大學(xué)》2013年碩士論文

【摘要】：瓦斯吸附在煤中,要經(jīng)過(guò)很長(zhǎng)時(shí)間才能全部解吸,因此采出的煤炭即便進(jìn)入選煤廠(chǎng)仍有部分瓦斯遺留在煤中,并隨著時(shí)間的推移逐步從煤中溢出,選煤廠(chǎng)的儲(chǔ)煤倉(cāng)留有煤炭較多、留存時(shí)間較長(zhǎng)、環(huán)境相對(duì)封閉,容易造成瓦斯積聚甚至引起瓦斯爆炸,給選煤廠(chǎng)的安全生產(chǎn)造成嚴(yán)重的威脅 本文應(yīng)用多孔介質(zhì)的流體動(dòng)力學(xué)理論原理,結(jié)合選煤廠(chǎng)煤倉(cāng)的結(jié)構(gòu)特點(diǎn)以及煤粒吸附特性,對(duì)煤倉(cāng)內(nèi)部空氣流動(dòng)矢量場(chǎng)和瓦斯?jié)舛确植记闆r進(jìn)行了數(shù)值模擬研究,根據(jù)模擬結(jié)果,結(jié)合虎龍溝礦選煤廠(chǎng)儲(chǔ)煤倉(cāng)的實(shí)際,給出了有效控制了煤倉(cāng)瓦斯?jié)舛鹊姆椒�。根�?jù)多孔介質(zhì)的流體動(dòng)力學(xué)原理,具體考慮儲(chǔ)煤倉(cāng)內(nèi)部瓦斯流動(dòng)特性,應(yīng)用控制流體運(yùn)動(dòng)的動(dòng)量、質(zhì)量、組分守恒定律,建立自然通風(fēng)條件下和采用強(qiáng)制通風(fēng)措施條件下的瓦斯流動(dòng)通用數(shù)學(xué)描述模型；基于煤倉(cāng)內(nèi)部貯煤存在形式與采空區(qū)遺煤存在形式相似,因此在其內(nèi)部的流體流動(dòng)都屬于多孔介質(zhì)內(nèi)的滲流和擴(kuò)散,根據(jù)前人研究成果通過(guò)建立儲(chǔ)煤倉(cāng)內(nèi)部瓦斯流動(dòng)的控制微分方程,結(jié)合標(biāo)準(zhǔn)k—ε模型和SIMPLE算法求解離散化后的流體運(yùn)動(dòng)控制微分方程組；借助模擬軟件F1uent對(duì)無(wú)通風(fēng)措施、自然通風(fēng)以及強(qiáng)制通風(fēng)的條件下的儲(chǔ)煤倉(cāng)內(nèi)部瓦斯流動(dòng)進(jìn)行模擬,得出儲(chǔ)煤倉(cāng)內(nèi)部不同通風(fēng)條件下的瓦斯?jié)舛确植�；根�?jù)模擬結(jié)果呈現(xiàn)的煤倉(cāng)瓦斯分布呈由下及上不同濃度的分層規(guī)律,結(jié)合虎龍溝礦選煤廠(chǎng)儲(chǔ)煤倉(cāng)的現(xiàn)場(chǎng)實(shí)測(cè)情況,對(duì)虎龍溝礦選煤廠(chǎng)儲(chǔ)煤倉(cāng)進(jìn)行通風(fēng)改造。通過(guò)對(duì)比計(jì)算機(jī)模擬結(jié)果和現(xiàn)場(chǎng)實(shí)測(cè)情況可以得出,在不采取任何通風(fēng)措施的情況下,煤倉(cāng)內(nèi)部瓦斯嚴(yán)重超標(biāo)；通過(guò)采用建立通風(fēng)孔和加裝局部通風(fēng)機(jī)的強(qiáng)制通風(fēng)措施,模擬了煤倉(cāng)瓦斯?jié)舛确植?結(jié)合虎龍溝礦選煤廠(chǎng)儲(chǔ)煤倉(cāng)的現(xiàn)場(chǎng)監(jiān)控?cái)?shù)據(jù)確定了局部通風(fēng)機(jī)的合理功率和風(fēng)量,并針對(duì)虎龍溝礦選煤廠(chǎng)儲(chǔ)煤倉(cāng)實(shí)際情況,給出有效控制煤倉(cāng)瓦斯?jié)舛鹊姆椒�。�?yàn)證了運(yùn)用模擬結(jié)果提出的通風(fēng)孔和加裝局部通風(fēng)機(jī)的辦法防治煤倉(cāng)瓦斯積聚,可以有效解決煤倉(cāng)瓦斯超限問(wèn)題。
[Abstract]:It takes a long time for the gas to be adsorbed in the coal before it can be completely desorbed, so even if the extracted coal enters the coal preparation plant, part of the gas remains in the coal and gradually spills out from the coal over time. The coal storage bunker in the coal preparation plant has more coal, longer retention time and relatively closed environment, which can easily cause gas accumulation and even cause gas explosion. This paper applies the theory of fluid dynamics of porous media, combined with the structural characteristics of coal bunker and the adsorption characteristics of coal particles in coal preparation plant. The air flow vector field and gas concentration distribution in coal bunker are numerically simulated. According to the simulation results and the actual situation of coal storage bunker in coal preparation plant of Hulonggou Mine, the method of effectively controlling the gas concentration in coal bunker is given. According to the hydrodynamic principle of porous media, considering the gas flow characteristics in coal storage bunker, the law of conservation of momentum, mass and component is applied to control the movement of fluid. A general mathematical description model of gas flow under natural ventilation and forced ventilation is established, based on the fact that the existing form of coal storage in the coal bunker is similar to that of the remaining coal in the goaf. Therefore, the fluid flow in its interior belongs to the seepage and diffusion in porous media. According to the previous research results, the governing differential equation of gas flow in coal storage bunker is established. Combining standard k- 蔚 model and simple algorithm to solve the discrete fluid motion control differential equation group, the simulation software F1uent is used to simulate the gas flow in the coal storage bin under the condition of no ventilation measures, natural ventilation and forced ventilation. The distribution of gas concentration under different ventilation conditions in coal storage bunker is obtained. According to the simulation results, the gas distribution in coal bunker is stratified from lower to upper different concentrations, combined with the field measurement of coal storage bunker in Hulonggou Coal preparation Plant. Ventilation transformation of coal storage bunker in coal preparation plant of Hulonggou Coal Mine was carried out. By comparing the results of computer simulation and field measurements, it can be concluded that, without any ventilation measures, the gas inside the coal bunker seriously exceeds the standard, and the forced ventilation measures of establishing ventilation holes and installing local ventilators are adopted. The distribution of gas concentration in coal bunker is simulated, and the reasonable power and air volume of local fan are determined by combining the field monitoring data of coal storage bunker in Hulonggou Coal preparation Plant, and aiming at the actual situation of coal storage bunker in Hulonggou Coal preparation Plant, The method of effectively controlling the gas concentration in coal bunker is given. It is verified that the method of preventing and controlling gas accumulation in coal bunker by means of ventilation hole and local fan, which is put forward by simulation results, can effectively solve the problem of gas exceeding limit in coal bunker.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TD712

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本文編號(hào)：2015097