本文選題：多晶硅　切入點(diǎn)：連鑄　出處：《大連理工大學(xué)》2015年碩士論文

【摘要】：重要的綠色清潔能源太陽能已經(jīng)越來越多的受到人們的重視和利用,多晶硅作為最主要的光伏材料,有著巨大的市場(chǎng)需求。利用鑄造工藝能夠獲得較低成本的多晶硅鑄錠,并且已得到廣泛的應(yīng)用,但是依然存在著單爐產(chǎn)量小、生產(chǎn)效率低等問題。本文以改進(jìn)制備工藝、提高鑄造法制備多晶硅錠的生產(chǎn)效率為目的,開展了利用連續(xù)鑄造工藝制備多晶硅鑄錠的數(shù)值模擬并且結(jié)合模擬結(jié)果進(jìn)行初步實(shí)驗(yàn)。通過利用有限元鑄造模擬軟件ProCAST分析了連鑄工藝應(yīng)用于多晶硅鑄錠的制備與傳統(tǒng)連鑄金屬材料制備過程的主要異同,根據(jù)硅在凝固過程中相對(duì)于其他金屬材料的特殊物理性質(zhì),結(jié)合接觸應(yīng)力的模擬結(jié)果,提出了多晶硅連鑄結(jié)晶器內(nèi)表面錐度的設(shè)計(jì)原理,并以此為基礎(chǔ)設(shè)計(jì)了一臺(tái)多晶硅連鑄設(shè)備。通過對(duì)照解析解的計(jì)算結(jié)果與實(shí)際連鑄實(shí)驗(yàn)測(cè)量結(jié)果,驗(yàn)證了溫度場(chǎng)、流場(chǎng)模擬結(jié)果以及熱-流耦合計(jì)算結(jié)果的可靠性。在此基礎(chǔ)上對(duì)多晶硅連鑄工藝包括初始澆注和穩(wěn)態(tài)連鑄兩個(gè)階段在內(nèi)的整體連鑄過程進(jìn)行了熱-流耦合模擬,得到了連鑄不同階段的溫度場(chǎng)分布情況。分析溫度場(chǎng)模擬結(jié)果發(fā)現(xiàn)相對(duì)較低的拉坯速度和較小的結(jié)晶器換熱系數(shù)更有益于形成較優(yōu)質(zhì)量多晶硅鑄錠。結(jié)合模擬結(jié)果提出的連鑄工藝優(yōu)化方案,利用自主設(shè)計(jì)的多晶硅連鑄設(shè)備進(jìn)行了多晶硅的連鑄初步實(shí)驗(yàn),通過合理地控制拉坯速度和結(jié)晶器換熱,最終利用連鑄方法得到了直徑為100mm的多晶硅鑄錠,通過數(shù)值模擬與實(shí)際實(shí)驗(yàn)相結(jié)合的方式,驗(yàn)證了直冷連鑄方法運(yùn)用于多晶硅鑄錠制備的可行性。
[Abstract]:The important green clean energy solar energy has been paid more and more attention to and utilized by people. As the most important photovoltaic material, polysilicon has a huge market demand. Low cost polysilicon ingot can be obtained by casting technology. And has been widely used, but there are still some problems such as low production rate and low production efficiency of single furnace. The purpose of this paper is to improve the production efficiency of producing polysilicon ingot by casting. Numerical simulation of polycrystalline silicon ingot prepared by continuous casting process was carried out and preliminary experiment was carried out in combination with simulation results. The continuous casting process was applied to the preparation of polysilicon ingot by using finite element casting simulation software ProCAST. The main similarities and differences between the preparation process of metal materials and conventional continuous casting, According to the special physical properties of silicon relative to other metal materials during solidification and the simulation results of contact stress, the design principle of the inner surface taper of polysilicon continuous casting mould is put forward. Based on this, a polysilicon continuous casting equipment is designed. The temperature field is verified by comparing the calculated results of analytical solution with the measured results of actual continuous casting experiments. Based on the results of flow field simulation and thermal-flow coupled calculation, the thermo-fluid-coupled simulation of the whole continuous casting process including initial casting and steady state continuous casting is carried out. The distribution of temperature field in different stages of continuous casting is obtained. The results of temperature field simulation show that lower casting speed and smaller heat transfer coefficient of mold are more beneficial to the formation of polysilicon ingot with better quality. The optimization scheme of continuous casting process proposed by Guo, The primary experiment of polysilicon continuous casting was carried out by using the self-designed polysilicon continuous casting equipment. By reasonably controlling the casting speed and mold heat transfer, the polycrystalline silicon ingot with diameter of 100mm was obtained by continuous casting method. Through the combination of numerical simulation and practical experiments, the feasibility of applying the method of direct cold continuous casting to the preparation of polysilicon ingot is verified.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ127.2

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本文編號(hào)：1670247