本文選題：天然氣水合物　切入點(diǎn)：分解　出處：《大連理工大學(xué)》2014年碩士論文

【摘要】：天然氣水合物資源儲存量大,能量密度高、環(huán)境友好。對于其開采目前面臨眾多技術(shù)性及安全性問題。天然氣水合物分解是一個吸熱過程,熱量傳遞直接影響水合物分解速率和分解進(jìn)程,對天然氣水合物分解過程傳熱分析對水合物開采的高效性及安全性有重要意義。因此,本文通過數(shù)值模擬方法對多孔介質(zhì)中天然氣水合物分解過程傳熱進(jìn)行分析。 本文利用一個二維軸對稱水合物分解模擬器,對水合物分解時各傳熱因素的影響進(jìn)行分析。對控制傳熱的參數(shù)進(jìn)行分離,分類對含水合物多孔介質(zhì)中的導(dǎo)熱、含水合物多孔介質(zhì)層與上下蓋層之間的導(dǎo)熱、含水合物多孔介質(zhì)中的對流換熱以及含水合物多孔介質(zhì)層的顯熱等傳熱因素對多孔介質(zhì)中甲烷水合物分解進(jìn)程的影響進(jìn)行了系統(tǒng)分析,通過對天然氣水合物產(chǎn)氣以及不同分解時刻壓力、溫度及水合物飽和度分布等數(shù)據(jù)進(jìn)行整理,揭示了多孔介質(zhì)中天然氣水合物降壓、注熱、以及聯(lián)合開采傳熱控制機(jī)理。 研究結(jié)果表明：1、較高的多孔介質(zhì)導(dǎo)熱,在多孔介質(zhì)水合物降壓分解中有限的促進(jìn)水合物的分解；在多孔介質(zhì)水合物注熱分解及聯(lián)合開采初期并不利于多孔介質(zhì)中水合物分解,但在后期能使迅速分解整個區(qū)域內(nèi)水合物縮短整體反應(yīng)時間。2、含水合物多孔介質(zhì)層與上下蓋層之間的導(dǎo)熱,在沒有外界額外熱量注入的多孔介質(zhì)水合物降壓分解中是主控因素。3、含水合物多孔介質(zhì)中的對流換熱,對多孔介質(zhì)水合物降壓分解一定的影響；對多孔介質(zhì)水合物注熱分解及聯(lián)合開采影響甚微。4、多孔介質(zhì)層的顯熱的研究分為多孔介質(zhì)比熱容和多孔介質(zhì)中含水量兩方面分析。在多孔介質(zhì)水合物降壓分解中,較高的比熱容為含水合物多孔介質(zhì)提供更多的顯熱,促進(jìn)水合物的分解,較多的水反而阻礙了水合物分解及產(chǎn)氣；在多孔介質(zhì)水合物注熱分解及聯(lián)合開采時,較高的多孔介質(zhì)比熱容和水含量貢獻(xiàn)了較多的顯熱但阻礙了熱量在多孔介質(zhì)中傳遞,進(jìn)而阻礙了水合物分解。
[Abstract]:The natural gas hydrate resource has a large amount of storage, high energy density and environmental friendliness. At present, the gas hydrate decomposition is an endothermic process, which is faced with many technical and safety problems at present. Heat transfer directly affects the rate and process of hydrate decomposition, and it is of great significance to the efficiency and safety of hydrate extraction by analyzing the heat transfer during the decomposition process of natural gas hydrate. In this paper, the heat transfer of gas hydrate decomposition in porous media is analyzed by numerical simulation. In this paper, a two-dimensional axisymmetric hydrate decomposition simulator is used to analyze the influence of heat transfer factors on hydrate decomposition. Heat conduction between the porous media layer containing hydrate and the upper and lower caprocks, The effects of heat transfer factors such as convection heat transfer in porous medium containing hydrate and sensible heat in porous layer of hydrate on the decomposition process of methane hydrate in porous medium are systematically analyzed. Based on the data of gas hydrate production, pressure at different decomposition times, temperature and hydrate saturation distribution, the mechanism of gas hydrate pressure reduction, heat injection and heat transfer control for combined exploitation in porous media is revealed. The results show that the higher heat conduction of porous media promotes the decomposition of hydrates in the decompression of hydrates in porous media, and the decomposition of hydrates in porous media is not beneficial to the decomposition of hydrates in porous media at the initial stage of gas hydrate injection and combined exploitation. However, in the later stage, the rapid decomposition of hydrates in the whole region can shorten the overall reaction time of 0.2, and the heat conduction between the porous media and the upper and lower caprocks of the hydrates can be obtained. In the decompression of hydrate in porous medium without extra heat injection, the main controlling factor is .3.Convective heat transfer in porous medium containing hydrate has a certain effect on the decompression of hydrate in porous medium. The study on the sensible heat of porous media layer can be divided into two aspects: specific heat capacity of porous medium and water content in porous medium. The higher specific heat capacity provides more sensible heat for the porous medium containing hydrates and promotes the decomposition of hydrates, but more water hinders the decomposition of hydrates and gas production. Higher specific heat capacity and water content of porous media contribute more sensible heat, but hinder heat transfer in porous media, which hinders hydrate decomposition.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P744.4

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本文編號：1676564