本文選題：通風(fēng)系統(tǒng) + 直流式旋風(fēng)除塵器��； 參考：《清華大學(xué)》2015年碩士論文

【摘要】：在通風(fēng)系統(tǒng)中一般使用過濾器對空氣中的顆粒物進行處理,該除塵方式在顆粒物濃度很高時存在過濾器堵塞、清洗更換頻繁等問題。為了解決這一問題,本文嘗試將直流式旋風(fēng)除塵器引入到通風(fēng)系統(tǒng)中,利用直流式旋風(fēng)除塵器降低空氣中的顆粒物濃度。由于通風(fēng)系統(tǒng)的特點,要求直流式旋風(fēng)除塵器必須在較低入口風(fēng)速下具有較高的顆粒分離效率和較低的壓力損失、單體處理風(fēng)量適宜、結(jié)構(gòu)緊湊和安裝方便等特點。為了滿足通風(fēng)系統(tǒng)對直流式旋風(fēng)除塵器的要求,本文展開了以下幾個方面的工作:1.分析了導(dǎo)流葉片參數(shù)對設(shè)備性能的影響。針對正交直母線葉片,通過數(shù)值模擬和實驗方法研究了主要葉片參數(shù)(葉片內(nèi)準(zhǔn)線方程、葉片個數(shù)、葉片厚度等)變化對直流式旋風(fēng)除塵器的壓力損失和分離效率的影響。分析并總結(jié)了不同型式、不同個數(shù)、不同厚度、不同角度葉片的性能特點,為直流式旋風(fēng)除塵器的導(dǎo)流葉片設(shè)計提供了指導(dǎo)。2.為了深入分析結(jié)構(gòu)參數(shù)與設(shè)備性能間的關(guān)系,通過數(shù)值模擬方法對直流式旋風(fēng)除塵器內(nèi)部的流場特征進行了初步研究。詳細(xì)分析了氣流流線、氣流速度、軸向速度、切向速度和壓力在設(shè)備內(nèi)部不同區(qū)域的分布特征,從而揭示了設(shè)備內(nèi)部流場參數(shù)的變化規(guī)律。在此基礎(chǔ)上,分析了排氣管形狀對速度、壓力等流場參數(shù)的影響,其研究結(jié)論可以為優(yōu)化設(shè)備結(jié)構(gòu)并降低設(shè)備阻力提供依據(jù)。3.研究了主要結(jié)構(gòu)參數(shù)和入口風(fēng)速對設(shè)備性能的影響。在導(dǎo)流葉片研究的基礎(chǔ)上,設(shè)計了若干具有不同導(dǎo)流葉片參數(shù)的實驗樣機。搭建實驗臺并利用實驗臺研究了排氣管形狀與尺寸、環(huán)狀區(qū)域長度、葉片角度與型式、外筒直徑、導(dǎo)流體形狀和入口風(fēng)速等因素對設(shè)備性能的影響。得到了不同結(jié)構(gòu)參數(shù)下,直流式旋風(fēng)除塵器的壓力損失和分離效率,并歸納總結(jié)了結(jié)構(gòu)參數(shù)與設(shè)備性能之間的關(guān)系。4.針對蘭州地區(qū)新風(fēng)系統(tǒng)和卷煙廠工藝空調(diào)系統(tǒng),結(jié)合這兩個場合中的顆粒特性,通過實驗和理論方法分析了直流式旋風(fēng)除塵器的應(yīng)用前景。結(jié)合通風(fēng)系統(tǒng)特點,給出了直流式旋風(fēng)除塵器在系統(tǒng)中的應(yīng)用方案。
[Abstract]:In the ventilation system, filters are generally used to treat particulate matter in the air. When the concentration of particulate matter is very high, the filter is blocked and the cleaning and replacement are frequent. In order to solve this problem, this paper attempts to introduce the DC cyclone dust collector into the ventilation system, and use the DC cyclone dust collector to reduce the concentration of particulate matter in the air. Because of the characteristics of the ventilation system, the DC cyclone dust collector must have higher particle separation efficiency and lower pressure loss at lower inlet wind speed, suitable air volume for single unit treatment, compact structure and easy installation. In order to meet the requirements of the ventilation system for the DC cyclone dust collector, the following aspects of the work have been carried out in this paper. The influence of flow guide vane parameters on the performance of the equipment is analyzed. The influence of main blade parameters (inner collimation equation, number of blades, thickness of blade, etc.) on pressure loss and separation efficiency of DC cyclone precipitator was studied by numerical simulation and experiment. The performance characteristics of different types, different numbers, different thickness and different angles of blades are analyzed and summarized, which provides guidance for the design of the guide vane of DC cyclone precipitator. In order to analyze the relationship between the structure parameters and the performance of the equipment, the characteristics of the flow field in the DC cyclone dust collector were studied by numerical simulation. The distribution characteristics of flow lines, airflow velocity, axial velocity, tangential velocity and pressure in different regions of the equipment are analyzed in detail, and the variation of flow field parameters in the equipment is revealed. On this basis, the influence of exhaust pipe shape on the flow field parameters, such as velocity and pressure, is analyzed. The results can provide a basis for optimizing the structure of the equipment and reducing the resistance of the equipment. The effects of main structure parameters and inlet wind speed on the performance of the equipment are studied. Based on the research of the flow guide blade, some experimental prototypes with different parameters of the guide blade are designed. The influence of the shape and size of exhaust pipe, the length of annular region, the angle and type of blade, the diameter of outer cylinder, the shape of diversion body and the inlet wind speed on the performance of the equipment were studied. The pressure loss and separation efficiency of DC cyclone dust collector with different structure parameters are obtained, and the relationship between structure parameters and equipment performance is summarized. Aiming at the fresh air system in Lanzhou area and the process air conditioning system in cigarette factory, the application prospect of DC cyclone dust collector is analyzed through experiments and theoretical methods combined with the particle characteristics of these two occasions. Combined with the characteristics of ventilation system, the application scheme of DC cyclone dust collector in the system is given.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU834.64

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