基于CFD的燃煤锅炉协同处置含油污泥方案设计  

Design of Co-Processing of Oily Sludge in Coal-Fired Boiler Basedon CFD

作　　者：张凡志[1] 郑德水 张海丹 李卫平 方仙明 张光学[3] ZHANG Fanzhi;ZHENG Deshui;ZHANG Haidan;LI Weiping;FANG Xianming;ZHANG Guangxue(Taizhou Power Plant of Zhejiang Zheneng Electric Power Co.,Ltd.,Taizhou 318016,China;Zhejiang Zheneng Energy Technology Research Co.,Ltd.,Hangzhou 311121,China;Institute of Energy Engineering,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]浙江浙能电力股份有限公司台州发电厂,浙江台州318016 [2]浙江浙能技术研究院有限公司,浙江杭州311121 [3]中国计量大学能源工程研究所,浙江杭州310018

出　　处：《锅炉技术》2025年第2期23-30,共8页Boiler Technology

基　　金：浙江省火力发电高效节能与污染物控制技术研究重点实验室开放课题(JSYJY-KJFW-2022-015)。

摘　　要：针对含油污泥产量高、危害大及处理困难等特点,设计了采用燃煤锅炉进行协同焚烧处置的技术方案,对含油污泥进行加热、除杂、配比及均匀化后,由喷枪雾化后形成50~150μm的液滴,送入炉膛燃烧。采用计算流体力学对设计方案进行验证及优化。结果表明:当喷枪布置在主燃区中下位置时,油泥液滴能够穿透至炉膛内部,避免贴壁燃烧引起的壁面温度高、还原性气氛强等问题。由于掺烧比例低、油泥热值与煤粉接近,因此不同的布置方案均不会影响整体炉膛内温度场分布特性。当喷枪布置在主燃区中间位置时,四周水冷壁表面的氧气体积分数较高,避免了高温腐蚀风险。从煤粉燃尽率来看,掺烧含油污泥后,不同的方案均能够降低飞灰含碳量,当喷枪布置在主燃区中间位置时,不同负荷下油泥对煤粉燃尽率的影响均较小。经过数值模拟分析后认为,采用大型燃煤锅炉进行含油污泥协同处置,最优方案是将雾化喷枪布置在主燃区中部二次风喷口附近。Aiming at the characteristics of high output,great harm and difficult treatment of oily sludge,a technical scheme of co-incineration and disposal using coal-fired boilers is designed.After heated,treated with removal of impurities,proportioned and homogenized,the oily sludge is atomized with droplets of 50150μm by a spray gun,and sent to the furnace for combustion.Computational fluid dynamics is used to verify and optimize the design scheme.The results show that when the spray gun is arranged in the lower middle position of the main combustion zone,the sludge droplets can penetrate into the furnace,and can avoid the problems of high wall temperature and strong reducing atmosphere caused by wall-close combustion.Due to the low co-fire proportion and the similar values between oil sludge and pulverized coal,different layout schemes will not affect the temperature field distribution characteristics in the overall furnace.When the spray gun is arranged in the middle of the main combustion zone,the oxygen volumetric fraction around the water walls is relatively high,which avoids the risk of high temperature corrosion.Finally,from the view of the burnout rate of pulverized coal,all different schemes can reduce the carbon content of fly ash after blending with oily sludge.And the effects on the rate by oil sludge at different loads are small when the spray gun is arranged in the middle of the main combustion area.After numerical simulation analysis,it is considered that the optimal solution for co-processing oily sludge with large coal-fired boilers is to arrange the atomizing spray gun near the secondary air nozzle in the middle of the main combustion area.

关 键 词：含油污泥 燃煤锅炉 协同处置 掺烧 计算流体力学 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]