Abstract

The structures of three- and four-barrel smokestacks are compared using the method of total discounted costs. It was revealed that three-barrel stacks are more profitable than four-barrel ones in almost the entire range of used smokestack characteristics with modern cost ratios. Formulas are given for calculating the diameter of the smokestack casing with two identical bores and a third, different in size. A technique has been developed for calculating the diameter of the casing of a three-barrel stack with bores of various diameters. In all compared variants, the same distances were laid between adjacent bores and the barrel and casing. For the first time, a methodology has been proposed for choosing the optimal dimensions of a three-barrel smokestack taking into account the individual conditions of gas transport along each barrel, allowing one to find the optimal distribution of gas velocities over bores of a three-barrel stack and to calculate the minimum total discounted costs for smokestacks with bores of different diameters, flow rates, and gas temperatures in them. It is shown that taking into account the hydrodynamic features in the bores with different gas velocities allows us to propose solutions that reduce the total reduced costs by 7–8% compared to traditional solutions. In the event that the optimal solution is to provide different speeds in the bores, then it is necessary to install confusers on each bore with individual and sufficient small angles of narrowing in order to prevent uneven velocity fields at the mouth of the smokestack and possible vortex formation when the flue gas flows from different bores merge when the stack is operating at maximum load.

中文翻译：

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TPP三桶烟囱的效益分析

摘要

使用总折现成本的方法比较了三桶和四桶烟囱的结构。结果表明，在具有现代成本比的几乎所有二手烟囱特性范围内，三桶烟囱比四桶烟囱更有利可图。给出了计算烟囱外壳直径的公式，该烟囱外壳具有两个相同的孔和一个尺寸不同的第三个孔。已经开发出一种用于计算具有不同直径的孔的三桶堆叠的壳体的直径的技术。在所有比较的变型中，相邻的孔与枪管和套管之间的距离相同。首次提出了一种方法，该方法应考虑到沿每个枪管的气体传输的具体情况，选择三枪管烟囱的最佳尺寸，使人们能够找到三桶烟囱的烟气速度的最佳分布，并为烟囱中直径，流量和气体温度不同的烟囱计算出最低的总折价​​成本。结果表明，考虑到具有不同气体速度的井眼中的流体动力学特征，我们可以提出一些解决方案，与传统解决方案相比，这些解决方案可将总降低的成本降低7–8％。如果最佳解决方案是在膛孔中提供不同的速度，则必须在每个膛孔上安装具有单独且足够小的狭窄角度的限制器，以防止烟囱口处的速度场不均匀并可能产生涡流当烟囱在最大负载下运行时，烟气从不同的孔流出时形成的烟气会合并。