用数值模拟方法研究挡风抑尘网高度对抑尘效率影响

采用数值模拟方法对某电厂露天煤场周围设置挡风抑尘网进行流场模拟,结合起尘量公式,计算了挡风抑尘网在不同高度下的抑尘效率。挡风墙高度分别12m、16m、20m、24m,当风速为4.3m/s时,挡风抑尘网效率分别为67.2%、81.4%、86.6%和88.3%;当风速为20 m/s时,抑尘网效率分别为55.1%、69.8%、74.6%和76.5%。

马鞍山当涂发电厂2×660MW机组输煤系统设计与运行

介绍了马鞍山当涂发电厂2×660 MW超临界燃煤发电机组工程的输煤系统的设计及运行情况,对输煤系统运行中一些问题进行了分析并提出建议,给同类工程输煤系统设计提供一些参考。

浅析1000MW级燃煤电厂空压机机型配置

以某2×1000MW机组燃煤电厂为例,对采用全螺杆式压缩机以及采用离心式压缩机和螺杆式压缩机联合供气2种模式进行分析比较,为1000MW级燃煤电厂空压机机型配置提供参考。

某2×1000MW机组电厂的气力除灰型式选择

火力发电厂的飞灰的输送型式常采用气力输送,叙述了某2×1 000 MW机组燃煤电厂采用正压浓相气力输送系统和双套管气力输送系统进行飞灰输送的技术经济分析结果,为同类型机组的气力除灰系统设计提供参考。

长距离、大功率带式输送机驱动方式分析

通过对长距离、大功率带式输送机3种驱动方式的技术经济比较,得出高压变频器驱动方式不仅在带式输送机起动方面有优良的性能,在运行方面也能满足输送机频繁重载起制动、频繁切换工况、小流量输料等生产特点,而且高效节能。

Modified Diffusion Flux Model for Analysis of Turbulent Gas-Particle Two-Phase Flows

A modified diffusion flux model (DFM) was developed to analyze turbulent multi-dimensional gas-particle two-phase flows. In the model, the solid particles move in a modified acceleration field, g′′ , which includes the effects of various forces on the particles as if all the forces have the same effect on the particles as the gravity. The accelerations due to various forces are then taken into account in the calcula- tion of the diffusion velocities of the solid particles in the gas-particle two-phase flow. The DFM was used to numerically simulate the gas-solid two-phase flow behind a vertical backward-facing step. The numerical simulation compared well with experimental data and numerical results using both the k-ε-Ap and k-ε-kp two- fluid models available in the literature. The comparison shows that the modified diffusion flux model correctly simulates the turbulent gas-particle two-phase flow.