Study on Modeling and Operation Characteristics of Pulverized-coal Preparation System with Medium Speed Coal Mill for Coal-fired Units

JING Zheng; WU Kening; LIU Baihui; HU Xiaoyang; WANG Zhu; QIU Binbin; WANG Jinshi

doi:10.19805/j.cnki.jcspe.2026.240619

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Study on Modeling and Operation Characteristics of Pulverized-coal Preparation System with Medium Speed Coal Mill for Coal-fired Units

更新时间：2026-10-10

- Study on Modeling and Operation Characteristics of Pulverized-coal Preparation System with Medium Speed Coal Mill for Coal-fired Units
- Chinese Journal of Power Engineering Vol. 46, Issue 1, Pages: 32-41(2026)
- 作者机构：
  
  1. 西安交通大学能动学院,陕西,西安,710049
  2. 河北西柏坡发电有限责任公司,河北,石家庄,050000
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.240619
  CLC：
- Online First：15 January 2026，
  
  Published：15 January 2026
- 稿件说明：
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景峥,伍克宁,刘百慧,胡晓阳,王珠,邱斌斌,王进仕. 燃煤机组中速磨煤机制粉系统建模及运行特性研究动力工程学报, 2026, 46(1): 32-41 https://doi.

org/10.19805/j.cnki.jcspe.2026.240619
景峥,伍克宁,刘百慧,胡晓阳,王珠,邱斌斌,王进仕. 燃煤机组中速磨煤机制粉系统建模及运行特性研究动力工程学报, 2026, 46(1): 32-41 https://doi. DOI： 10.19805/j.cnki.jcspe.2026.240619.

org/10.19805/j.cnki.jcspe.2026.240619 DOI：

摘要

建立精确的制粉系统模型并分析其运行特性

是系统运行控制优化的关键理论基础。搭建了包括磨煤机、一次风机、输煤管道等关键设备的磨辊式中速磨煤机制粉系统灰箱模型

其中耦合了磨煤机内部存煤量与运行参数的关系

考虑了煤粉细度对制粉系统出力的影响等。基于模型分析了制粉系统在单参数及固定风煤比时的稳态运行特性和启动过程中的动态运行特性。结果表明:当给煤量(质量流量)从12 kg/s增加到26 kg/s时

磨煤单耗从10.26 kW·h/t降低到7.14 kW·h/t

降低了30.4%;在固定风煤比的情况下

一次风温和原煤水分质量分数是决定煤粉出口温度的关键因素

当风煤比为1.6

一次风温从260℃升高到300℃时

出口风粉温度将升高19.03%;在升负荷过程中

制粉系统出力延迟了102 s。

Abstract

Establishing an accurate model of the pulverized-coal preparation system and analyzing its operational characteristics are the key theoretical foundations for optimizing the system operational control. By incorporating the coupling relationship between the internal coal inventory of the coal mill and its operational parameters

and considering the impact of pulverized coal fineness on the output capacity of the coal pulverizing system

a gray box model of pulverized-coal preparation system with roller-type medium speed coal mills

encompassing key equipment such as coal mills

primary air fans

and coal conveying pipelines

was constructed. Based on this model

the steady-state operational characteristics of the pulverized-coal preparation system under single-parameter and fixed air-to-coal ratio conditions

as well as its dynamic operational characteristics during the startup process

were analyzed. Results indicate that when the coal feed rate (mass flow rate) increases from 12 kg/s to 26 kg/s

the specific energy consumption for coal grinding decreases from 10.26 kW·h/t to 7.14 kW·h/t

representing a reduction of 30.4%. Under a fixed air-coal ratio

the primary air temperature and the mass fraction of moisture in raw coal are identified as the key factors determining the outlet temperature of pulverized coal. When the air-coal ratio is 1.6 and the primary air temperature rises from 260 ℃ to 300 ℃

the outlet air-coal mixture temperature increases by 19.03%. During the load-increasing process

the output capacity of the coal pulverizing system is delayed by 102 s.

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Keywords

references

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