本文選題：蓄熱式加熱爐 + 強(qiáng)化輻射換熱　； 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：軋鋼加熱爐是鋼鐵生產(chǎn)過(guò)程中的重要設(shè)備之一,也是軋鋼工序的主要耗能設(shè)備,提高加熱爐熱效率、降低單位產(chǎn)品能耗、減少污染物排放,對(duì)鋼鐵企業(yè)的節(jié)能降耗、可持續(xù)發(fā)展具有積極作用。近年來(lái),蓄熱式加熱爐經(jīng)過(guò)不斷的發(fā)展進(jìn)步,各項(xiàng)性能指標(biāo)優(yōu)良,與傳統(tǒng)加熱爐相比,排煙溫度低、爐子熱效高,并且可使用單一高爐煤氣進(jìn)行燃燒,煙氣中NOx含量低,爐溫均勻穩(wěn)定、加熱質(zhì)量好,所以蓄熱式軋鋼加熱爐得到了鋼鐵企業(yè)的廣泛應(yīng)用。因此,研究蓄熱式軋鋼加熱爐的熱工特性,挖掘其節(jié)能潛力、提高其能源利用效率,對(duì)鋼鐵企業(yè)實(shí)現(xiàn)節(jié)能降耗具有重要實(shí)際意義。本論文在分析了蓄熱式加熱爐爐內(nèi)的綜合換熱過(guò)程的基礎(chǔ)上,根據(jù)輻射傳熱的相關(guān)理論,研究了黑體強(qiáng)化爐內(nèi)輻射換熱技術(shù)的節(jié)能原理;借助ANSYS軟件包中的ICEM-CFD和Fluent軟件,建立了蓄熱式加熱爐黑體強(qiáng)化爐內(nèi)熱交換的三維幾何模型,選用k-?湍流模型、渦耗散模型、P-1模型以及快速型、熱力型NOx生成模型,分別進(jìn)行了黑體強(qiáng)化加熱爐與無(wú)黑體強(qiáng)化加熱爐爐膛溫度場(chǎng)的數(shù)值模擬;通過(guò)分析黑體強(qiáng)化爐內(nèi)輻射換熱過(guò)程、溫度場(chǎng)分布狀況及強(qiáng)化效果,在實(shí)際加熱爐內(nèi)設(shè)計(jì)并安裝黑體元件,強(qiáng)化爐內(nèi)輻射傳熱;通過(guò)對(duì)蓄熱式加熱爐熱平衡測(cè)算,分析了爐內(nèi)黑體元件的安裝對(duì)其熱工性能及相關(guān)能耗指標(biāo)的影響。結(jié)果表明:蓄熱式加熱爐爐內(nèi)爐墻、爐頂壁面安裝黑體元件,具有強(qiáng)化爐內(nèi)輻射換熱的能力,不僅節(jié)能降耗而且能夠延長(zhǎng)爐襯壽命、提高鋼坯加熱質(zhì)量;黑體元件不僅增大了爐體內(nèi)表面積及黑度,壁面輻射換熱率提高,爐內(nèi)換熱強(qiáng)度增大,而且使?fàn)t溫分布更加均勻穩(wěn)定,爐膛溫度略有升高且在中部保持穩(wěn)定,有利于減少鋼坯的溫差和加熱缺陷;加熱爐安裝黑體元件與未安裝相比,爐體外表面溫度降低了2~5℃,爐體散熱減少11.43%;加熱爐鋼坯的燃料消耗量降低8.3%,熱效率提高6.3%,產(chǎn)量提高11.4%,實(shí)現(xiàn)約8.2%的節(jié)能率。
[Abstract]:The reheating furnace is one of the important equipments in the process of steel production, and it is also the main energy consuming equipment in the rolling process. It can improve the heat efficiency of the heating furnace, reduce the energy consumption per unit product, reduce the pollutant emission, and save energy and reduce the consumption of the iron and steel enterprises. Sustainable development plays a positive role. In recent years, the regenerative reheating furnace has been developed continuously, and the performance indexes are excellent. Compared with the traditional heating furnace, the temperature of exhaust gas is lower, the heat efficiency of the furnace is high, and the single blast furnace gas can be used for combustion, and the content of NOx in the flue gas is low. The furnace temperature is uniform and stable, and the heating quality is good, so the regenerative reheating furnace is widely used in iron and steel enterprises. Therefore, it is of great practical significance for iron and steel enterprises to study the thermal characteristics of regenerative steel rolling reheating furnace, tap its energy saving potential and improve its energy utilization efficiency. On the basis of analyzing the comprehensive heat transfer process in regenerative furnace, according to the theory of radiation heat transfer, the energy saving principle of blackbody enhanced radiation heat transfer technology in furnace is studied, and the ICEM-CFD and Fluent software in ANSYS software are used. In this paper, a three-dimensional geometric model of blackbody enhanced heat exchange in regenerative furnace is established. Turbulent model, vortex dissipation model and fast and thermodynamic NOx generation model are used to simulate the temperature field of blackbody enhanced furnace and blackbody enhanced furnace respectively, and the radiation heat transfer process in blackbody enhanced furnace is analyzed. Distribution of temperature field and strengthening effect, blackbody element is designed and installed in actual heating furnace, radiation heat transfer in furnace is enhanced, heat balance of regenerative furnace is measured, The influence of installation of blackbody elements on thermal performance and related energy consumption index is analyzed. The results show that the blackbody elements are installed on the wall of the furnace and the top wall of the regenerative furnace, which can enhance the radiation and heat transfer in the furnace, not only save energy and reduce the consumption, but also prolong the service life of the furnace lining and improve the heating quality of the billet. The blackbody element not only increases the surface area and blackness of the furnace, but also increases the heat transfer rate of the wall surface radiation and the heat transfer intensity in the furnace, and makes the temperature distribution of the furnace more uniform and stable, and the furnace temperature increases slightly and keeps stable in the middle of the furnace. It is advantageous to reduce the temperature difference and heating defect of the billet, and the temperature of the outer surface of the furnace body is reduced by 2 ~ 5 鈩，

本文編號(hào)：1848858