本文選題：集熱器　切入點(diǎn)：余熱利用　出處：《山東大學(xué)》2015年碩士論文

【摘要】：社會經(jīng)濟(jì)的發(fā)展離不開能源的消耗。隨著我國經(jīng)濟(jì)的高速發(fā)展,能源消費(fèi)量也飛速增加。我國是世界上第二大能源消耗國,建材行業(yè)是排在冶金行業(yè)、化工行業(yè)后的第三能耗大戶。水泥行業(yè)能耗與污染情況不容樂觀,必須加強(qiáng)節(jié)能減排。同時,水泥回轉(zhuǎn)窯表面散熱量可達(dá)到3-5MW,人們往往忽略這部分熱量,將其完全排入大氣。因此,水泥回轉(zhuǎn)窯筒體余熱回收利用技術(shù)的研究,對于充分合理的利用這種資源,提高水泥廠余熱梯級利用和能源利用率、有效降低余熱排放的熱污染、保護(hù)生態(tài)環(huán)境具有重要積極意義。本文主要工作如下所示：1.對國內(nèi)外現(xiàn)有的水泥回轉(zhuǎn)窯余熱回收利用系統(tǒng)的結(jié)構(gòu)型式,運(yùn)行特點(diǎn)及分析方法進(jìn)行了綜合概述；并充分考慮回轉(zhuǎn)窯實(shí)際運(yùn)行情況及回轉(zhuǎn)窯溫度分布后,本課題組設(shè)計了一種回轉(zhuǎn)窯余熱回收利用系統(tǒng)。2.建立了集熱器物理模型；對其進(jìn)行網(wǎng)格劃分,網(wǎng)格質(zhì)量驗證,網(wǎng)格無關(guān)性驗證；設(shè)置好各個域的邊界條件；選擇湍流模型及輻射模型；根據(jù)實(shí)際情況,選擇本文適合的求解器。3.對集熱器進(jìn)行數(shù)值模擬。得出不同流動型式及不同結(jié)構(gòu)型式集熱器,空氣域和水域的溫度云圖。改變不同結(jié)構(gòu)型式集熱器水域的進(jìn)口流量,得出不同流量下?lián)Q熱管橫截面內(nèi)溫度分布,與實(shí)際情況相符合。改變不同結(jié)構(gòu)型式集熱器水域的進(jìn)口流量,得出性能較好的集熱器型式。改變不同結(jié)構(gòu)型式集熱器水域的進(jìn)口流量,得出換熱管外壁換熱量,換熱管外壁吸收輻射熱量及換熱管內(nèi)水吸收熱量的關(guān)系。4.在水泥廠設(shè)備正常運(yùn)行基礎(chǔ)上搭建了實(shí)驗平臺,真實(shí)反映集熱器性能及對生產(chǎn)的影響。對集熱器一些參數(shù)進(jìn)行觀測,記錄,分析,得出不同集熱器內(nèi)的換熱量；集熱器吸熱量的影響因素；并將實(shí)驗結(jié)果與數(shù)值分析結(jié)果進(jìn)行對比。5.對集熱器進(jìn)行傳熱過程分析,采用熱網(wǎng)絡(luò)模型,進(jìn)行合理假設(shè)后,建立并求解了其傳熱數(shù)學(xué)模型,得出各個過程換熱量和能量收支平衡情況,并與實(shí)驗結(jié)果進(jìn)行對比。
[Abstract]:With the rapid development of China's economy, energy consumption is also increasing rapidly. China is the second largest energy consumer in the world, and the building materials industry is ranked in the metallurgical industry. The third largest energy consumption after the chemical industry. Cement industry energy consumption and pollution situation is not optimistic, we must strengthen energy saving and emission reduction. At the same time, cement rotary kiln surface heat loss can reach 3 to 5 MWs, people often ignore this part of heat, Therefore, the research of waste heat recovery and utilization technology of cement rotary kiln cylinder can make full and reasonable use of this resource, improve the cascade utilization and energy utilization of waste heat in cement plant, and effectively reduce the heat pollution caused by waste heat emission. It is of great significance to protect the ecological environment. The main work of this paper is as follows: 1. The structure, operation characteristics and analysis methods of the existing waste heat recovery and utilization system of cement rotary kiln at home and abroad are summarized. After fully considering the actual operation of rotary kiln and the temperature distribution of rotary kiln, our team designed a rotary kiln waste heat recovery and utilization system .2.The physical model of collector was established, and the grid was divided, and the quality of grid was verified. Grid independence verification; setting up boundary conditions in each domain; selecting turbulence model and radiation model; according to the actual situation, Choose the suitable solver in this paper. 3. Carry on the numerical simulation to the collector. Get the temperature cloud diagram of different flow type and different structure type collector, air domain and water area. Change the inlet flow rate of the water area of different structure type collector, The temperature distribution in the cross section of the heat exchanger pipe at different flow rates is obtained, which is in accordance with the actual situation. Change the inlet flow rate of the water area of the collector with different structure, and get the heat transfer of the outer wall of the heat transfer pipe. The relationship between the absorption of radiation heat on the outer wall of the heat exchanger pipe and the heat absorption of water in the heat exchanger pipe. Based on the normal operation of the equipment in the cement plant, an experimental platform is built to reflect the performance of the collector and the effect on the production. Some parameters of the collector are observed. Record, analyze, get the heat transfer in different collector; influence factors of heat absorption in collector; compare the experimental results with numerical analysis results. 5. Analyze the heat transfer process of the collector, adopt the heat network model, After reasonable assumption, the mathematical model of heat transfer is established and solved, and the balance of heat transfer and energy budget of each process is obtained, and the results are compared with the experimental results.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ172.625.9;TK115

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