Numerical Simulation Study on Air-Powder Deviation and Adjustable Orifice Balancing Performance of Direct-fired Pulverizing System

GUO Xiuwen; JIANG Xudong; ZENG Jiawei; HAN Jinke; WU Jianqun; XIA Yongjun; NIE Changda

doi:10.19805/j.cnki.jcspe.2025.240397

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Numerical Simulation Study on Air-Powder Deviation and Adjustable Orifice Balancing Performance of Direct-fired Pulverizing System

更新时间：2026-10-10

- Numerical Simulation Study on Air-Powder Deviation and Adjustable Orifice Balancing Performance of Direct-fired Pulverizing System
- Chinese Journal of Power Engineering Vol. 45, Issue 8, Pages: 1186-1193(2025)
- 作者机构：
  
  1. 江投能源技术研究有限公司,江西,南昌,330096
  2. 江投国华信丰发电有限责任公司,江西,赣州,341600
  3. 河北工业大学能源与环境工程学院,天津,300131
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240397
  CLC：
- Online First：12 August 2025，
  
  Published：2025
- 稿件说明：
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郭修文,蒋序东,曾佳微,韩金克,吴建群,夏永俊,聂昌达. 直吹式制粉系统风粉偏差及可调缩孔调平的数值模拟研究动力工程学报, 2025, 45(8): 1186-1193 https://doi.

org/10.19805/j.cnki.jcspe.2025.240397
郭修文,蒋序东,曾佳微,韩金克,吴建群,夏永俊,聂昌达. 直吹式制粉系统风粉偏差及可调缩孔调平的数值模拟研究动力工程学报, 2025, 45(8): 1186-1193 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240397.

org/10.19805/j.cnki.jcspe.2025.240397 DOI：

摘要

针对直吹式制粉系统磨煤机出口一次风管道内风粉分配不均衡问题

在一次风管道风速冷、热态调平试验基础上

对某700 MW超临界燃煤发电机组中速磨煤机和出口一次风管道的风粉两相流动开展数值模拟

研究磨煤机内部风粉不均分布及管道固有阻力差异对出口管道风粉分配的影响

并对可调缩孔门的风粉调平性能进行了探究。结果表明:实际运行中一次风不对称进入磨煤机导致分离器前一次风管道对应4个分区的风粉分配不均衡

风量分配最大偏差为7.8%

煤粉量分配最大偏差为23%;分离器前风粉均匀分布时热态风粉分配最大偏差分别为11.26%和9.12%

而风粉不均分布时热态风粉分配最大偏差分别为11.14%和16.78%

管道固有阻力差异是造成风量偏差的最主要原因

而内部煤粉不均分布和管道固有阻力差异的共同作用导致出口一次风管道煤粉量分配偏差;未在一次风管道前设置有效的煤粉分配器情况下

可调缩孔门对出口管道煤粉量均衡调节作用有限

难以同时实现风粉均衡分配。

Abstract

To address the issue of unbalanced air-powder distribution in primary air ducts at the outlet of coal mills in a direct-fired pulverizing system

based on cold and hot-state air velocity balancing tests in primary air ducts

numerical simulations were conducted on the two-phase flow of air and powder in medium-speed coal mills and primary air ducts of a 700 MW supercritical coal-fired power unit. The influence of uneven air-powder distribution inside the coal mill and inherent resistance differences in the ducts on air-powder distribution at the outlet were studied

and the balancing performance of adjustable orifices was investigated. Results show that asymmetric entry of primary air into the coal mill causes unbalanced air-powder distribution in four zones corresponding to the primary air ducts before the separator during actual operation. The maximum relative deviation in air volume distribution is 7.8%

and the maximum relative deviation in powder volume distribution is 23%. When air-powder distribution before the separator is uniform

the maximum relative deviations in hot-state air and powder distribution are 11.26% and 9.12%

respectively. When air-powder distribution is uneven

these deviations become 11.14% and 16.78%

respectively. Inherent resistance differences in the ducts are the primary cause of air volume deviations

while the combined effect of uneven coal powder distribution inside the mill and inherent duct resistance differences leads to powder volume distribution deviations in the outlet primary air ducts. Without an effective powder distributor installed in front of the primary air ducts

adjustable orifices have limited ability to balance powder volume distribution in the outlet ducts

making it difficult to achieve simultaneous balance of air and powder distribution.

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references

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