【摘要】：伴隨著我國(guó)高速公路的發(fā)展,廢舊瀝青混合料的再生成為人們?nèi)找骊P(guān)注的焦點(diǎn),因此廢舊瀝青混合料廠(chǎng)拌熱再生技術(shù)成為了研究的熱點(diǎn)。強(qiáng)制間歇式瀝青混合料攪拌設(shè)備配套再生設(shè)備的第二烘干筒是該再生系統(tǒng)的關(guān)鍵設(shè)備,第二烘干筒的熱效率影響著整個(gè)系統(tǒng)的能耗和生產(chǎn)效率,而且熱效率的提高對(duì)于節(jié)能環(huán)保也有著非常重要的意義。本文概述了瀝青路面老化損壞和舊瀝青混合料再生的機(jī)理,簡(jiǎn)單介紹了強(qiáng)制間歇式瀝青混合料廠(chǎng)拌熱再生設(shè)備的相關(guān)情況和設(shè)備的主要結(jié)構(gòu)及生產(chǎn)工藝流程;本文在研究燃料燃燒特性的基礎(chǔ)上,對(duì)燃料燃燒所需空氣量和產(chǎn)生煙氣量,燃燒產(chǎn)生熱煙氣的溫度,燃料使用量等參量進(jìn)行分析計(jì)算,基于上述參量計(jì)算出第二烘干筒在工作過(guò)程中的耗熱量并由此得到烘干筒的熱效率,根據(jù)計(jì)算結(jié)果可知該烘干筒熱效率偏低有一定的提升空間;本文根據(jù)計(jì)算烘干筒各個(gè)區(qū)段熱煙氣的溫度,計(jì)算出烘干筒的結(jié)構(gòu)尺寸,這與烘干筒廠(chǎng)家提供的結(jié)構(gòu)尺寸基本一致,驗(yàn)證了相關(guān)計(jì)算的合理性;根據(jù)熱煙氣溫度計(jì)算出烘干筒各個(gè)區(qū)段的舊瀝青混合料的體積,依此劃分烘干筒各個(gè)區(qū)段的長(zhǎng)度;利用流體分析軟件Fluent對(duì)阿曼3000型強(qiáng)制間歇式瀝青混合料廠(chǎng)拌熱再生設(shè)備第二烘干筒筒內(nèi)溫度場(chǎng)和筒壁溫度分布進(jìn)行分析,得到烘干筒內(nèi)和筒壁的溫度分布情況,也得到烘干筒軸線(xiàn)方向上熱煙氣溫度的變化情況,由此驗(yàn)證了烘干筒區(qū)段劃分的合理性,最后根據(jù)同類(lèi)型烘干筒生產(chǎn)廠(chǎng)家進(jìn)行的現(xiàn)場(chǎng)試驗(yàn),驗(yàn)證其筒壁溫度分布情況與仿真結(jié)果一致;利用仿真軟件Matlab對(duì)烘干區(qū)段的料簾進(jìn)行分析,通過(guò)建立物料溫升情況的數(shù)學(xué)模型,得到烘干區(qū)葉片的結(jié)構(gòu)角和安裝角不同時(shí)物料的溫升曲線(xiàn),由此可以得出要得到最理想的溫升曲線(xiàn)二者應(yīng)該取多少,這可以指導(dǎo)烘干區(qū)段葉片的優(yōu)化性能的設(shè)計(jì),從而提高烘干筒熱效率;在烘干筒筒內(nèi)葉片設(shè)計(jì)時(shí),為了達(dá)到預(yù)熱的目的且能防止物料撞擊火焰,烘干筒預(yù)熱區(qū)段采用盒型葉片,這提高了烘干筒的熱效率。
[Abstract]:With the development of expressway in our country, the recycling of waste asphalt mixture has become the focus of more and more attention, so the hot recycling technology of waste asphalt mixture has become a hot spot. The second dryer is the key equipment of this regeneration system, and the thermal efficiency of the second dryer affects the energy consumption and production efficiency of the whole system. Moreover, the improvement of thermal efficiency is of great significance for energy saving and environmental protection. In this paper, the mechanism of asphalt pavement aging damage and old asphalt mixture regeneration is summarized, and the related situation of forced intermittent asphalt mixture hot recycling equipment, the main structure and production process of the equipment are briefly introduced. Based on the study of fuel combustion characteristics, this paper analyzes and calculates the parameters such as the amount of air needed and the amount of flue gas produced by fuel combustion, the temperature of heat flue gas produced by combustion, the amount of fuel used, and so on. Based on the above parameters, the heat consumption in the working process of the second dryer is calculated and the thermal efficiency of the drying cylinder is obtained. According to the calculation results, there is a certain lifting space for the lower thermal efficiency of the dryer. Based on the calculation of the temperature of the hot flue gas in each section of the dryer, the structural size of the dryer is calculated, which is basically consistent with the structural dimension provided by the dryer manufacturer, which verifies the rationality of the relevant calculation. According to the heat smoke temperature, the volume of old asphalt mixture in each section of drying tube is calculated, and the length of each section of drying tube is divided according to the volume. The temperature field in the second dryer and the temperature distribution of the cylinder wall in the second dryer of Oman 3000 forced intermittent asphalt mixture recycling equipment were analyzed by using the fluid analysis software Fluent, and the temperature distribution in the dryer and the cylinder wall was obtained. The variation of flue gas temperature in the direction of the drying tube axis is also obtained, which verifies the rationality of the division of the drying cylinder section. Finally, according to the field test carried out by the same type dryer manufacturer, The temperature distribution of the cylinder wall is verified to be consistent with the simulation results. By using the simulation software Matlab, the material curtain in the drying section is analyzed, and the temperature rise curve of the material is obtained by establishing the mathematical model of the material temperature rise, and the structure angle and installation angle of the blade in the drying area are obtained. It can be concluded that the optimal temperature rise curve should be obtained, which can guide the design of the optimum performance of the blade in the drying section and improve the thermal efficiency of the drying tube. In order to achieve the purpose of preheating and prevent materials from impinging on flame, the preheating section of dryer adopts box-shaped blades, which improves the thermal efficiency of the dryer.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U415.52

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