选煤厂给料机和落料管产尘机理及控制技术
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摘要
本论文主要针对中煤集团平朔分公司四个选煤厂的煤尘主要污染源—给料机及落料管进行研究,通过对平朔各选煤厂煤尘特性进行测试得到的大量数据,结合以气固两相流理论为基础的动态数值模拟,分析出选煤厂给料机和落料管处煤尘污染的产尘机理和逸散规律。研究发现,给料机的粉尘污染主要由于给料机的给料诱导风流正压和自身密封不严造成的。针对这种情况,首先采用耐磨柔性密封材料对给料机进行密封,然后对皮带机采用密封性导料槽进行封闭并安装滤袋除尘器,最后通过数值模拟技术确定出除尘器的风量风压,并从粉尘控制机理上论述了这种方式的合理性。落料管处粉尘污染主要来源于落料管内的高压诱导风流喷尘以及裸皮带机尾甩尘,对落料管高压诱导风流采用相对密封配合滤袋除尘器的除尘方案,对机尾裸皮带甩尘采用封闭罩配合超声波喷雾的除尘方案,通过数值模拟技术确定了除尘方案中的主要技术参数(导料槽相对密封长度、除尘器风量风压等)。数值模拟结果和治理后的实测均证实了给料机和落料管的除尘方案是有效可行的。上述研究方法和结论对于相似行业的粉尘治理有参考和借鉴作用。
The aim of this paper is mainly to study the main coal-dust pollution sources in the four coal preparation plants of Ping Shuo Branch of China National Coal Group. Through the combination of many measurement data with numerical simulation of gas-solid two-phase flow, dust precipitation mechanisms have been gained for the feeder and the blanking tube in Ping Shuo Cola Preparation Plant. Dust pollution of the feeder is caused by the positive pressure of the induced feeding wind-flow and the bad seal itself. Firstly, the durable flexible seal material is used to seal up the feeder. Secondly, the seal guide-chute with the dust collector is installed on the belt. Finally, the air volume and the pressure of the dust collector are determined by means of numerical simulation, and the reasonability of the plan is explained from the angle of the dust control mechanism. The dust pollution of the blanking tube is mainly from the jetting dust caused by the induced high-pressure wind-flow in the blanking tube and the splashing dust of the naked belt tail. The plan of the combination of the relative seal with the bag dust separator is used to control the high-pressure in the blanking tube. The plan of the combination of the seal cover with the ultrasonic sprayer is used to control the splashing dust of the naked belt tail. The main technical parameters of the dust control plan, such as the seal guide-chute length, and the air volume and the pressure of the dust collector, are determined through the numerical simulation. The simulation result and the actual result verify the above dust control plans. The study methods and results provide a guide for the dust control in a certain similar business.
The aim of this paper is mainly to study the main coal-dust pollution sources in the four coal preparation plants of Ping Shuo Branch of China National Coal Group. Through the combination of many measurement data with numerical simulation of gas-solid two-phase flow, dust precipitation mechanisms have been gained for the feeder and the blanking tube in Ping Shuo Cola Preparation Plant. Dust pollution of the feeder is caused by the positive pressure of the induced feeding wind-flow and the bad seal itself. Firstly, the durable flexible seal material is used to seal up the feeder. Secondly, the seal guide-chute with the dust collector is installed on the belt. Finally, the air volume and the pressure of the dust collector are determined by means of numerical simulation, and the reasonability of the plan is explained from the angle of the dust control mechanism. The dust pollution of the blanking tube is mainly from the jetting dust caused by the induced high-pressure wind-flow in the blanking tube and the splashing dust of the naked belt tail. The plan of the combination of the relative seal with the bag dust separator is used to control the high-pressure in the blanking tube. The plan of the combination of the seal cover with the ultrasonic sprayer is used to control the splashing dust of the naked belt tail. The main technical parameters of the dust control plan, such as the seal guide-chute length, and the air volume and the pressure of the dust collector, are determined through the numerical simulation. The simulation result and the actual result verify the above dust control plans. The study methods and results provide a guide for the dust control in a certain similar business.
引文
[1]葛少成,齐庆杰,邵良杉.选煤厂毛煤仓仓顶粉尘析出机理与控制技术[J].辽宁工程技术大学学报,2007,26(3):325-327.
[2]葛少成,齐庆杰,邵良杉.毛煤仓下粉尘污染原因及处理[J].辽宁工程技术大学学报,2007,26(4):485-487.
[3]葛少成,邵良杉,齐庆杰.选煤厂转运点除尘方案模拟优化设计[J].辽宁工程技术大学学报, 2007, 26(6):805-808.
[4]马云东,郭昭华,赵二夫.选煤厂粉尘产出机理及综合治理方案研究[J].辽宁工程技术大学学报,2002,21(04):507-509.
[5]杨胜来.综采工作面粉尘运移和粉尘质量浓度三维分布的数值模拟研究[J].中国安全科学学报,2001,11(4):61-65.
[6]魏新利,张海红,王定标.旋风分离器内颗粒轨迹的数值模拟[J].郑州大学学报:工学版,2004,25(3):14-17.
[7]纪俊红,郭仁宁,李锐平.城市生活垃圾风力分选中流场的数值模拟[J].辽宁工程技术大学学报,2005,24(S2):278-280.
[8]常红亮.凤凰山矿选煤厂除尘系统的技术改造[J].煤炭加工与综合利用,2007(1):49-52.
[9]岑可法,樊建人.工程气固多项流动的理论及计算[M].杭州:浙江大学出版社,1990:448-491.
[10]蒲舸,张力,辛明道.CFBC旋风分离器气固两相流数值模拟与优化[11].工程热物理学报,2006,27(02):268-270.
[11] Ge Shaocheng,Shao Liangshan,Zhang Qingfeng et al. Simulation study of a feasible dry-type dust control plan [A]. 2008 International Symposium on Safety and Technology[C]. Bejing, China: 2008: 1736~1738
[12]杨晓梅.选煤厂粉尘综合治理[J].太原:山西煤炭,1999.12
[13]Sung-Eun Kim, Ferit Boysan.Application of CFD to Envi-ronmental Flows[J]. Journal of Wind Engineering and In-dustrial Aerodynamics. 81(1999), 145-158.
[14]陈荣光.矿山企业污染防治与环境保护强制性标准执行手册.宁夏大地音像出版社,2004.3
[15]张小艳,郭强,李全.微细水雾除尘技术的实验研究[J].环境污染与防治.2003.8
[16]张东辉,鲁民,关中吉.利用雾化射流技术治理输煤皮带转运点粉尘污染[J].哈尔滨:黑龙江电力,2004.2
[17]于洪林,田海宏.一种治理选煤粉尘的有效途径[J].煤炭技术,2004.6
[18]吴琨,王京刚,毛益平等.荷电水雾振弦栅除尘技术机理研究[J].北京:安全与环保学报,2004.8
[19]赵立门,赵安平.选煤厂煤尘防治技术[J].中国煤炭,2004.2
[20]周威明,余澄海.粉尘控制新技术[J].北京:工业安全与环保,2004.3
[21]张殿印,王纯,除尘器手册,化学工业出版社,2004.10,179~183
[22]韩学增,李志明·准格尔露天矿选煤厂粉尘研究与治理[J]·煤炭工程, 2000, (4)·
[23]王传兴,惠中良·选煤厂煤尘及其防治[J]·选煤技术, 2000, (5)·
[24]顾强,刘炳江·改进选煤厂防尘技术的有效途径探讨[J]·2004, (4)·
[25]苏成斌、输煤程控系统设计大庆石油学院硕士论文.2003
[26]陈若晰次力发电厂输煤控制系统概述[J].机械工程与自动化,2007,No.1:156一157.
[27]李勇,山乐胜,沈竞为.火电厂输煤系统粉尘治理现状及改进[J].华北电力科技,2003,No.12:29一31.
[28]翁志洪,王幼华,吴陆恒.平果热电厂皮带上煤输煤系统的改造[J].工业安全与环保,2001.27(10):9一11.
[29]陶勇,输煤系统降低粉尘污染方案研究[J].Zo03:63一64
[30]刘昌耀.输煤系统的技术改造[J].西部煤化工,2003,N0.2:19一22.
[31]H.Lubcke,St.Schmidt,T.Rung,et al.Comparison of LESand RANS in Bluff-body Flows[J].Journal of Wind Engi-neering and Industrial Aerodynamics. 89 (2001) 1471 -1485.
[32]日本建议.AIJ Recommendations for Loads on Buildings,1996.
[33]顾踌,许晋源.气固两相流场的湍流颗粒浓度理论模型[J].应用力学学报,1994. No.11:11-18
[34]李孔清.市内超细悬浮颗粒模型及算法研究,湖南大学博士论文.2007
[2]葛少成,齐庆杰,邵良杉.毛煤仓下粉尘污染原因及处理[J].辽宁工程技术大学学报,2007,26(4):485-487.
[3]葛少成,邵良杉,齐庆杰.选煤厂转运点除尘方案模拟优化设计[J].辽宁工程技术大学学报, 2007, 26(6):805-808.
[4]马云东,郭昭华,赵二夫.选煤厂粉尘产出机理及综合治理方案研究[J].辽宁工程技术大学学报,2002,21(04):507-509.
[5]杨胜来.综采工作面粉尘运移和粉尘质量浓度三维分布的数值模拟研究[J].中国安全科学学报,2001,11(4):61-65.
[6]魏新利,张海红,王定标.旋风分离器内颗粒轨迹的数值模拟[J].郑州大学学报:工学版,2004,25(3):14-17.
[7]纪俊红,郭仁宁,李锐平.城市生活垃圾风力分选中流场的数值模拟[J].辽宁工程技术大学学报,2005,24(S2):278-280.
[8]常红亮.凤凰山矿选煤厂除尘系统的技术改造[J].煤炭加工与综合利用,2007(1):49-52.
[9]岑可法,樊建人.工程气固多项流动的理论及计算[M].杭州:浙江大学出版社,1990:448-491.
[10]蒲舸,张力,辛明道.CFBC旋风分离器气固两相流数值模拟与优化[11].工程热物理学报,2006,27(02):268-270.
[11] Ge Shaocheng,Shao Liangshan,Zhang Qingfeng et al. Simulation study of a feasible dry-type dust control plan [A]. 2008 International Symposium on Safety and Technology[C]. Bejing, China: 2008: 1736~1738
[12]杨晓梅.选煤厂粉尘综合治理[J].太原:山西煤炭,1999.12
[13]Sung-Eun Kim, Ferit Boysan.Application of CFD to Envi-ronmental Flows[J]. Journal of Wind Engineering and In-dustrial Aerodynamics. 81(1999), 145-158.
[14]陈荣光.矿山企业污染防治与环境保护强制性标准执行手册.宁夏大地音像出版社,2004.3
[15]张小艳,郭强,李全.微细水雾除尘技术的实验研究[J].环境污染与防治.2003.8
[16]张东辉,鲁民,关中吉.利用雾化射流技术治理输煤皮带转运点粉尘污染[J].哈尔滨:黑龙江电力,2004.2
[17]于洪林,田海宏.一种治理选煤粉尘的有效途径[J].煤炭技术,2004.6
[18]吴琨,王京刚,毛益平等.荷电水雾振弦栅除尘技术机理研究[J].北京:安全与环保学报,2004.8
[19]赵立门,赵安平.选煤厂煤尘防治技术[J].中国煤炭,2004.2
[20]周威明,余澄海.粉尘控制新技术[J].北京:工业安全与环保,2004.3
[21]张殿印,王纯,除尘器手册,化学工业出版社,2004.10,179~183
[22]韩学增,李志明·准格尔露天矿选煤厂粉尘研究与治理[J]·煤炭工程, 2000, (4)·
[23]王传兴,惠中良·选煤厂煤尘及其防治[J]·选煤技术, 2000, (5)·
[24]顾强,刘炳江·改进选煤厂防尘技术的有效途径探讨[J]·2004, (4)·
[25]苏成斌、输煤程控系统设计大庆石油学院硕士论文.2003
[26]陈若晰次力发电厂输煤控制系统概述[J].机械工程与自动化,2007,No.1:156一157.
[27]李勇,山乐胜,沈竞为.火电厂输煤系统粉尘治理现状及改进[J].华北电力科技,2003,No.12:29一31.
[28]翁志洪,王幼华,吴陆恒.平果热电厂皮带上煤输煤系统的改造[J].工业安全与环保,2001.27(10):9一11.
[29]陶勇,输煤系统降低粉尘污染方案研究[J].Zo03:63一64
[30]刘昌耀.输煤系统的技术改造[J].西部煤化工,2003,N0.2:19一22.
[31]H.Lubcke,St.Schmidt,T.Rung,et al.Comparison of LESand RANS in Bluff-body Flows[J].Journal of Wind Engi-neering and Industrial Aerodynamics. 89 (2001) 1471 -1485.
[32]日本建议.AIJ Recommendations for Loads on Buildings,1996.
[33]顾踌,许晋源.气固两相流场的湍流颗粒浓度理论模型[J].应用力学学报,1994. No.11:11-18
[34]李孔清.市内超细悬浮颗粒模型及算法研究,湖南大学博士论文.2007