中速磨煤机制粉系统优化技术研究及应用

doi:10.12096/j.2096-4528.pgt.19188

摘要/Abstract

摘要：

为了满足发电机组对制粉系统越来越高的要求，对制粉系统进行优化改造是十分必要的。通过对中速磨煤机和煤粉管道的详细分析和研究，找到症结所在并提出了磨煤机优化措施和煤粉管道动态调平方法。磨煤机优化研究引入磨内流场的理念，通过对磨内结构的改进，最终实现对磨内流场的整体优化，使中速磨煤机的性能得到全面本质性提升。管道动态调平是在实现风粉磨内均化的前提下，采用压差法实时对管道之间风粉流量偏差进行测量，根据测量结果，利用管道上的阻力调节装置，实时调平管道之间的阻力，实现管道之间一次风流量均衡控制，最终实现制粉系统风粉均衡控制。该技术能有效提高制粉系统对煤种适应能力，并实现风粉动态均衡控制。

关键词: 中速磨煤机, 制粉系统, 流场优化, 风粉均衡控制

Abstract:

It is necessary to optimize the pulverizing system to meet the higher and higher requirements of the power generation unit for the pulverizing system. Through the detailed analysis and research of medium speed pulverizer and pulverized coal pipelines, the crux was found and the optimization measures of pulverizer and dynamic leveling method of pulverized coal pipelines were put forward. The concept of flow field in the mill was introduced into the study of pulverizer optimization, through the improvement of the internal structure of the mill, the overall optimization of the internal flow field of the mill was finally realized, so that the performance of pulverizer was comprehensively and substantially improved. The dynamic leveling of pipeline is to measure the flow deviation of air-powder between pipelines in real time by the pressure difference method under the premise of realizing air-powder homogenization in mill, and according to the measurement results to level the resistance between pipelines in real time by the resistance adjustment device on the pipelines, so as to realize the primary air flow equalizing control between pipelines, and finally realize the air-powder equalizing control of the pulverizing system. The technology can effectively improve the adaptability of the pulverizing system to the coal type and realize the dynamic equalizing control of the air-powder.

Key words: medium speed pulverizer, pulverizing system, flow field optimization, air-powder equalizing control

中图分类号:

TK05

陈刚, 刘进峰, 李大正, 程华. 中速磨煤机制粉系统优化技术研究及应用[J]. 发电技术, 2021, 42(3): 363-373.

Gang CHEN, Jinfeng LIU, Dazheng LI, Hua CHENG. Research and Application of Optimization Technology of Medium Speed Pulverizing System[J]. Power Generation Technology, 2021, 42(3): 363-373.

图/表 23

图1 HP磨煤机结构

Fig.1 HP coal mill structure

图2 MPS(ZGM)磨煤机结构

Fig.2 MPS(ZGM) coal mill structure

图3 磨辊磨损对比

Fig.3 Contrast of grinding roll abrasion

表1 煤粉偏差统计表

Tab. 1 Statistical table of Pulverized coal

煤粉管编号	R90筛余/%	R90细度偏差/%	抽取3 min总粉量/g	煤粉质量偏差/g	煤粉质量分数偏差/%
F1	15.36	-4.60	95.34	-14.88	-13.50
F2	37.24	17.28	166.04	55.82	50.64
F3	28.32	8.36	100.40	-9.86	-8.95
F4	19.64	-0.32	120.10	9.83	8.92
F5	8.20	-11.76	72.52	-37.70	-34.21
F6	11.00	-8.96	107.00	-3.20	-2.90
平均值	19.96	-	110.72	-	-

表2 HP磨煤机与MPS(ZGM)磨煤机结构比较

Tab. 2 Structural contrast between HP and MPS(ZGM) coal mills

磨煤机形式	HP	MPS(ZGM)
磨辊加载方式	弹簧变加载	液压变加载
分离器形式	动态分离器	动、静结合分离器
磨辊形式	圆锥形辊	轮胎形辊

图4 HP旋转叶笼

Fig.4 HP rotating cage

图5 HP磨煤机流场示意图

Fig.5 Flow field diagram of HP coal mill

图6 HP磨煤机流体仿真图

Fig.6 HP coal mill fluid simulation

图7 HP磨煤机上部流场俯视图

Fig.7 Top view of HP coal mill upper flow field

图8 磨辊处下部流场

Fig.8 Lower flow field of grinding roller

图9 非磨辊处下部流场

Fig.9 Lower flow field of non grinding roller

图10 MPS(ZGM)磨内流场示意图

Fig.10 Flow field diagram of MPS(ZGM) mill

图11 MPS(ZGM)旋转叶笼

Fig.11 MPS(ZGM) rotating cage

图12 MPS(ZGM)下部流场

Fig.12 Lower flow field of MPS(ZGM)

图13 原煤从磨盘溢出示意图

Fig.13 Diagram of coal spilling from grinding plate

图14 优化后HP磨内流场

Fig.14 Flow field after optimization of HP mill

图15 优化后HP磨煤机上部流场俯视图

Fig.15 Top view of optimizated HP coal mill upper flow field

图16 磨辊处下部流场优化

Fig.16 Optimization of grinding roller lower flow field

图17 非磨辊处下部流场优化

Fig.17 Optimization of non grinding roller lower flow field

图18 MPS(ZGM)磨煤机下部流场优化

Fig.18 Optimization of MPS(ZGM) coal mill lower flow field

图19 风粉调平示意图

Fig.19 Diagram of air-powder equalizing control

图20 石子煤对比

Fig.20 Comparison of stone coal

表3 ZGM113N磨煤机优化比较

Tab. 3 Optimization effect comparison of ZGM113N coal mill

参数	2F磨	2D磨
磨煤机电流/A	55.30	54.64
一次风量/(t/h)	110.90	96.99
进口一次风压力/kPa	8.91	9.07
磨煤机出口压力/kPa	4.40	2.57
磨煤机阻力/kPa	4.51	6.51
给煤机煤量/(t/h)	56.90	48.57
风煤比	2.05	2.00
磨煤机单位电耗/(kW·h/t)	8.58	9.94
分离器电流/A	41.83	0
分离器单位电耗/(kW·h/t)	0.46	0
总单位电耗/(kW·h/t)	9.04	9.94
煤粉细度R90(15~25)	18	16

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