共查询到20条相似文献,搜索用时 62 毫秒
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为了优化锅炉的燃烧工况,保证电厂运行的安全性和经济性,以某电厂1 215 t/h亚临界四角切圆锅炉为研究对象,进行冷态空气动力场试验。试验包括燃烧器检查、一次风调平、二次风门挡板特性测试和冷态空气动力场试验。结果表明:一次风调平后风速均匀性较好;大部分二次风小挡板的调节特性良好,开度为0~60%(或80%),能够对风速、风量进行有效调整,但也存在部分小挡板调节范围偏窄、调节速率较大或挡板过开的情况;锅炉四角配风均衡,但是炉内气流形成的切圆偏大,气流形成的刷墙风速较高,是造成锅炉高温腐蚀的重要原因。 相似文献
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对WGZl70/9.8-3型煤粉锅炉在冷态下进行了全面的测试分析,找出送、引风机及二次风门挡板开度与风量(速)的关系及四角喷燃下炉内速度分布及气流均匀情况;通过对试验结果的分析,确定送风机挡板开度在40%左右、两台引风机并联运行挡板各开45%左右较为适宜,燃烧中配风、各二次风门挡板的运行开度及对二次配风进行冷态调平,同时对炉内空气动力场进行飘带试验研究,经过合理的一、二次风配置,空气动力场良好,为锅炉的顺利点火及稳定运行提供依据。 相似文献
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为了给锅炉热态调整提供依据,对高效煤粉锅炉进行冷态空气动力场试验.方法 是通过锅炉冷态模化原理,模拟炉膛热态下的空气动力场.通过试验,得到一次、二次、三次风对应风速的风门开度,并绘出炉膛燃烧假想切圆的直径以及偏心情况的结果.根据一次、二次、三次风风门调节特性,有以下规律:一次、二次、三次风风速均可达到设定值,且四个角风... 相似文献
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四角切圆燃烧大容量电站锅炉烟气参数场偏置问题的研究 总被引:15,自引:2,他引:15
文章以采用四角切圆燃烧方式的300MW以上大容量电站锅炉的大量性能反馈数据及现场试验数据为基础,通过分析和归纳,指出了该类电站锅炉会不可避免地存在上炉膛及对流烟道中的烟气流场,速度和温度场的左右侧偏置现象,并指出了该类锅炉屏式再热器和末级再热器易爆管及末级过热器出口沿炉宽方向左右侧对应点间汽温偏差过大的根本原因。文中还对原则性治理方案进行了可行性论证。并推荐了最优化方案。 相似文献
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Tong Zhu Shaozeng Sun Chunyi Xia Baizeng An Shaohua Wu Yukun Qin Xichen Ma 《热科学学报(英文版)》1997,6(2):149-154
In this paper,the effect of the imaginary circle diameter φi and the initial flow field on the aerodynamic field in a tangentially fired furnace was studied by numerical simulation and experments in the cold model.Results show that merely reducing the imaginary circle diameter φi can not significantly reduce the rotational diameter φ in the range considered.The flow still rotates counter-clockwise stably and does not change rotation direction when the direction of all jet axes are deflected suddenly to the opposite rotation direction by up to 5.4° in a counter-clockwise flow filed.It is the first time that the numerical simulation results were obtained which agreed quite well with this experimental phenomena qualitatively.The experimental data,ie.e,the rotational diameter φ and the maximum velocity on the symmetric central line of furnace Vm,are only a bit larger than the simulation resuts.It is shown that the initial flow field has an important influence on the aerodynamic field in the funace.Other measures have to be taken as well in order to reduce φ to resist slagging and high temperature corrosion of furnace tubes.Moreover,a new kind of grid arrangement was proposed in this paper,which can reduce effectively the false diffusion at the exit zone of burner. 相似文献
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