Research and Application of Optimization Technology of Medium Speed Pulverizing System

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

Abstract

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

CLC Number:

TK05

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.

Figures/Tables 23

Fig.1 HP coal mill structure

Fig.2 MPS(ZGM) coal mill structure

Fig.3 Contrast of grinding roll abrasion

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	-	-

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

Fig.4 HP rotating cage

Fig.5 Flow field diagram of HP coal mill

Fig.6 HP coal mill fluid simulation

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

Fig.8 Lower flow field of grinding roller

Fig.9 Lower flow field of non grinding roller

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

Fig.11 MPS(ZGM) rotating cage

Fig.12 Lower flow field of MPS(ZGM)

Fig.13 Diagram of coal spilling from grinding plate

Fig.14 Flow field after optimization of HP mill

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

Fig.16 Optimization of grinding roller lower flow field

Fig.17 Optimization of non grinding roller lower flow field

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

Fig.19 Diagram of air-powder equalizing control

Fig.20 Comparison of stone coal

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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