本文選題：管式濕式電除塵器 + 氣流分布�。� 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：管式濕式電除塵器可看作由多個線管式電除塵器并聯(lián)組成,若各電除塵器之間處理煙氣流量偏差過大,將導(dǎo)致濕式電除塵器總的除塵效率下降。采用CFD數(shù)值模擬技術(shù),對某熱力公司116MW鍋爐配套管式濕式電除塵器的內(nèi)部氣流分布進(jìn)行研究分析,并對氣流分布進(jìn)行組織與優(yōu)化。在電場進(jìn)口斷面氣流速度分布滿足相對均方根指標(biāo)要求的基礎(chǔ)上,將各單管處理煙氣流量偏差控制在一定范圍之內(nèi),以保障濕式電除塵器達(dá)到規(guī)定的排放要求。現(xiàn)場測試結(jié)果表明,出口粉塵濃度滿足項目技術(shù)規(guī)范規(guī)定的排放要求,數(shù)值模擬結(jié)果可指導(dǎo)管式濕式電除塵器設(shè)計。本文以某熱力公司116MW鍋爐配套管式濕式電除塵器為研究對象,采用計算流體動力學(xué)(computational fluid dynamics,CFD)方法對除塵系統(tǒng)的內(nèi)部氣流分布進(jìn)行了數(shù)值模擬試驗。通過對原設(shè)計方案的流場分析,提出針對性的優(yōu)化改進(jìn)方案,最終實現(xiàn)如下的優(yōu)化結(jié)果:(1)優(yōu)化后各電場分區(qū)進(jìn)口斷面速度相對均方根最大為0.19,速度分布均勻,滿足電場區(qū)氣流分布均勻性?≤0.25的電除塵器技術(shù)規(guī)范要求。(2)煙氣流量偏差超過±15%的單管只有2個(死角地方),優(yōu)化后的結(jié)果可滿足項目技術(shù)規(guī)范要求。(3)現(xiàn)場測試結(jié)果表明,管式濕式電除塵器出口煙氣含塵濃度小于5 mg/m3,驗證了數(shù)值模擬方法的可靠性,說明了數(shù)值模擬結(jié)果可指導(dǎo)管式濕式電除塵器設(shè)計。
[Abstract]:The tubular wet electrostatic precipitator can be regarded as a parallel composed of multiple line tubular electrostatic precipitators. If the deviation of flue gas flow among the electrostatic precipitators is too large, the total dust removal efficiency of the wet electrostatic precipitators will be reduced. CFD numerical simulation technology is used to study and analyze the internal airflow distribution of the pipe type wet electrostatic precipitator (ESP) of a 116MW boiler in a thermal company, and the airflow distribution is organized and optimized. On the basis of the airflow velocity distribution of the inlet section of the electric field meeting the requirements of the RMS index, the flue gas flow deviation of each single pipe is controlled within a certain range to ensure that the wet ESP can meet the prescribed discharge requirements. The field test results show that the export dust concentration can meet the emission requirements stipulated in the technical specification of the project, and the numerical simulation results can guide the design of the tubular wet electrostatic precipitator. In this paper, the pipe type wet electrostatic precipitator (WESP) of a 116MW boiler in a thermal company is taken as the research object, and the numerical simulation test of the internal airflow distribution of the dust collection system is carried out by using the computational fluid dynamics (CFD) method. Through the analysis of the flow field of the original design scheme, a targeted optimization and improvement scheme is put forward. Finally, the optimized results are as follows: 1) after the optimization, the maximum relative RMS velocity of the inlet section of each electric field zone is 0.19, and the velocity distribution is uniform. To meet the requirements of the technical specification for electrostatic precipitators 鈮，

本文編號：1950681