双进双出钢球磨煤机异形钢球成因分析及治理策略研究

Research on the Cause Analysis and Remediation Strategies for Non-Standard Steel Ball Grinders with Dual-Input/Dual-Output Configuration

摘要

双进双出钢球磨煤机是大型火电机组制粉系统的主要设备，研磨介质的形态完整性直接影响到制粉能力以及运行经济性。本文以某6×600MW机组BBD4060型双进双出钢球磨煤机为研究对象，针对2025年机组限出力治理中发现的占比约10%的异形钢球问题，用硬度检测、火花放电原子发射光谱分析、剖面金相检验等手段实行系统的分析。研究又发现了异形钢球累积造成的研磨能力减少、制粉单耗增加的失效演化规律，从运行控制、检修保养、材质改良、筛分技术革新四个方面给出全流程治理方略，给同类型磨煤机钢球寿命管理、制粉系统节能降耗给出工程参照。

Abstract

The double inlet and double outlet steel ball coal mill is the main equipment in the powder production system of large thermal power units. The integrity of the grinding medium directly affects the powder production capacity and operational economy. This article takes the BBD4060 double inlet and double outlet steel ball coal mill of a certain 6 × 600MW unit as the research object. In response to the problem of irregular steel balls accounting for about 10% discovered in the limited output control of the unit in 2025, a systematic analysis was carried out using methods such as hardness testing, spark discharge atomic emission spectroscopy analysis, and profile metallographic examination. The study has also discovered the failure evolution law of reduced grinding capacity and increased powder consumption caused by the accumulation of irregular steel balls. A full process governance strategy is proposed from four aspects: operation control, maintenance, material improvement, and screening technology innovation, providing engineering reference for the service life management of steel balls in similar coal mills and energy saving and consumption reduction of powder systems.

关键词

双进双出磨煤机 / 异形钢球 / 失效分析 / 铬锰钨抗磨铸铁

Key words

dual inlet and dual outlet coal mill / Alien steel ball / Failure analysis / Chromium manganese tungsten wear-resistant cast iron

参考文献

[1] 焦传宝, 王建华. 双进双出钢球磨煤机运行中存在的问题及对策[J]. 中国电力, 2004, 37(10):68-71.

[2] 王雅琳, 刘正雄, 王晓丽, 等. 基于差分进化的球磨机钢球磨损规律预测方法[J]. 华东理工大学学报(自然科学版), 2014, 40(3):347-353.

[3] 双进双出磨煤机制粉系统机理建模与仿真[J]. 动力工程学报, 2017, 37(6):458-464.

[4] 宋绍伟. 磨煤机钢球最佳级配技术应用研究[J]. 电力科学与工程, 2011, 27(5):67-71.

[5] 双进双出钢球磨煤机的特性与故障处理[J]. 中国电力, 2004, 37(10):72-75.