大型燃煤锅炉掺烧含油污泥的数值模拟及工程应用  

Numerical simulation of oily sludge blending in large coal-fired boilers and its engineering application

作　　者：顾永平 吴剑波 张凡志[1] 张海丹 张辉[1] 张光学[3] GU Yongping;WU Jianbo;ZHANG Fanzhi;ZHANG Haidan;ZHANG Hui;ZHANG Guangxue(Taizhou Power Plant of Zhejiang Zheneng Power Co.,Ltd.,Taizhou 318016,China;Zhejiang Energy Group R&D,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：《能源环境保护》2024年第6期132-138,共7页Energy Environmental Protection

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：针对我国含油污泥产生量大、成分复杂、处置困难等问题,提出了在大型燃煤锅炉中掺烧含油污泥的技术路线。首先,对掺烧含油污泥的技术方案进行数值模拟,发现掺烧后锅炉内温度场分布变化不大,主燃区温度轻微升高;当部分燃料由煤粉替换为含油污泥时,由于后者着火快、燃尽高,可以提高主燃区燃烧温度,进而促进NO_(x)被还原,因此减少了NO_(x)排放;掺烧含油污泥后,飞灰含碳量降低,锅炉效率提高。随后,该技术在330 MW机组上进行了工程应用,实测结果表明,在120 MW负荷下,含油污泥掺烧后NO_(x)排放值由425 mg/Nm^(3)降低至376 mg/Nm^(3),锅炉效率由原来的91.90%提高到92.13%,因此,该掺烧技术具有较好经济性和环保性,且具有较好的推广应用前景。In response to the issues of large production volume,complex composition,and difficulties in the disposal of oily sludge in China,this paper presents a novel technical approach that involves blending and burning oily sludge in large coal-fired boilers.First,a numerical simulation was conducted to evaluate the co-burning scheme of oily sludge.The results showed that blending did not significantly alter the temperature field distribution within the boiler,except for a slight increase observed in the main combustion zone.When a portion of the fuel was replaced with oily sludge instead of pulverized coal,the combustion temperature in the main zone rose due to the fast ignition and high combustion completeness of oily sludge,resulting in a reduction of nitrogen oxides(NO_(x))emissions.Additionally,burning oily sludge led to a decrease in the carbon content of the fly ash,thereby improving boiler efficiency.Secondly,this technical approach was implemented in practice on a 330 MW boiler.The measurement results demonstrated that under a 120 MW load,the blending and burning of sludge reduced the NOx emission value from 425 mg/Nm^(3)to 376 mg/Nm^(3)and increased boiler efficiency from 91.90%to 92.13%.Therefore,the blending approach offers significant economic and environmental benefits and promising prospects for widespread applications.

关 键 词：含油污泥 燃煤锅炉 掺烧 数值模拟 工程应用 

分 类 号：X51[环境科学与工程—环境工程]