大尺度电站锅炉中的强声传播和声效应研究

项目名称： 大尺度电站锅炉中的强声传播和声效应研究

项目编号： No.11474091

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 姜根山

作者单位： 华北电力大学（保定）

项目金额： 95万元

中文摘要： 在大尺度电站锅炉中，用强声波来促进炉内煤粉燃烧、强化换热器传热是提高锅炉综合效率、降低煤耗、减少污染物排放的重要潜在手段，但由于炉内燃烧区域具有大梯度变化和多变量交叉耦合作用等物理特征，导致声波在炉内含固体颗粒负压气体中的非线性传播及其声效应十分复杂。目前，电站燃煤锅炉中的非线性声学问题仍是一个尚未解决的难题。本课题将在前一基金课题研究基础上，针对大尺度电站锅炉用强声波促进燃烧和强化传热的新一代应用声学技术，以揭示炉内非线性声学规律为目的，重点探讨强声波促进燃烧、强化传热的机理和方法。主要研究内容包括：（1）炉内含固体颗粒气体中的强声传播；（2）强声作用下煤颗粒周围的振荡流动特征；（3）强声作用对煤颗粒与周围环境的传热和传质的影响；（4）强声作用对炉内换热器管道表面传热效率的影响。通过课题研究，揭示炉内强声波的传播规律，探索强声作用下煤颗粒燃烧和换热管道传热的声效应。

中文关键词： 电站锅炉；强声传播；非线性声效应；强化煤燃烧；声流

英文摘要： In large-scale power plant boilers, using the high-intensity sound waves to enhance pulverized coal combustion and heat exchanger transfer in power boilers is a potential way to improve the efficiency of boiler, reduce the coal consumption and pollutant emissions. However, because of the large gradients variation and multivariate cross-coupling efffect in the combustion zone, nonlinear propagation of sound waves and its acoustic effect are very complex in the negative pressure gas containing solid particles. Currently, the nonlinear acoustics issue in coal-fired power boilers is still an unsolved problem. On the basis of previous fund project studies, this thesis focuses on the mechanisms and methods of promoting combustion and heat transfer by using high-intensity sound waves, it reveals the nonlinear acoustics law in the large-scale power plant boiler through using this new application of acoustic technology. The main research contents include:(1) high-intensity sound propagation in the gas containing solid particles;(2) oscillatory flow characteristics around coal particles under the high-intensity sound effects;(3) the influence of high-intensity sound effects on the heat and mass transfer of coal particle with the surrounding environment; and (4) the efffect on the heat transfer efficiency of the heat exchanger tube surface in boiler. The research reveals the propagation of high-intensity sound waves in boiler, explores the acoustic effects about coal particle combustion and heat-exchanger transfer under high-intensity sound effects.

英文关键词： Power boiler;propagation of high-intensity sound waves;nonlinear acoustic effects;enhancement of coal combustion;acoustic streaming