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首页> 外文期刊>Thermal engineering >Basic Laws of the Processes and the Principle of Minimum Energy Consumption during Pneumatic Transport and Distribution of Pulverized Fuel in Direct Pulverized Fuel Preparation Systems
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Basic Laws of the Processes and the Principle of Minimum Energy Consumption during Pneumatic Transport and Distribution of Pulverized Fuel in Direct Pulverized Fuel Preparation Systems

机译：直接粉煤制备系统中粉煤的气动输送和分配过程中的过程基本定律和最低能耗原则

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摘要

The paper presents analysis of the basic laws and a calculation-based investigation of processes related to the low-concentration pneumatic transport and the distribution of finely dispersed pulverized fuel in direct pulverized fuel preparation systems of boiler units. Based on the principle of the minimum energy consumption, it is shown that, at high (standard) velocities of the turbulent gas flow-of 25-30 m/s, which is by 1.5-2 times higher than the critical speeds-the finely dispersed pulverized fuel can be transported simultaneously in the form of a low-concentration flow in pipelines and a concentrated, to 30% of the flow rate, thin layer on the pipeline walls with the height of the layer equal to 0.02-0.04 of the pipe radius. Consideration of this phenomenon is of great significance in terms of securing the efficient operation of pulverized fuel distribution units. The basic characteristics of the process have been determined and validated by test bench investigations using both model systems and pulverized fuel distribution systems of a number of power-generating units. The obtained results underlie a methodological approach to developing high-efficiency adjustable pulverized fuel distribution units. Also, results of industrial testing are presented that confirm the results of the analysis and of experimental studies.
机译：本文介绍了锅炉机组直接粉煤制备系统中与低浓度气力输送和细分散粉煤分布有关的过程的基本规律分析和基于计算的研究。根据最小能耗的原理，结果表明，在湍流气流的高（标准）速度下（25-30 m / s），它比临界速度高1.5-2倍。分散的粉状燃料可以低浓度的形式同时输送到管道中，并在管道壁上浓缩一层薄薄的薄层（至其流量的30％），其高度等于管道的0.02-0.04半径。考虑到这种现象，对于确保粉状燃料分配单元的有效运行具有重要意义。该过程的基本特征已通过使用多个发电单元的模型系统和粉状燃料分配系统的试验台调查确定并得到验证。获得的结果奠定了开发高效可调节粉状燃料分配装置的方法论基础。此外，还提供了工业测试结果，这些结果证实了分析和实验研究的结果。

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