动力煤选煤厂商品煤质量动态控制系统设计的研究
发布时间：2018-10-14 13:14
【摘要】：动力煤选煤厂洗选产品的配煤是选煤厂生产的一个重要环节,同样是选煤厂产品质量控制的最后环节,根据用户订单的产品灰分要求,利用选煤厂配煤系统,从而达到提高动力煤商品煤的品种多样性和质量稳定率。 随着煤质的变差,采煤机械化程度的提高,末煤以及粗煤泥越来越多,大多数的动力煤选煤厂选煤工艺多采用分级入选和配煤,为了达到用户订单的产品要求,一般采用产品仓仓下配煤,对于分级入选的末煤,采用一段时间洗选全部末煤,一段时间末煤全部进仓。实践中往往会发现精煤仓与末原煤仓存在着配煤中的不平衡,即末原煤仓里的原煤不够用来与精煤进行配煤,末原煤洗选的意义没有达到反而增加了煤泥水处理的难度,提高了成本。 为了改变这种现状,首先可以考虑将原煤进行部分分级入选,另一部分直接进入产品仓,最后与筛选之后的精煤进行配煤。其次可以研制出一种新型的末煤分流装置对分级入选的末煤进行分流。通过对顾桥选煤厂原煤性质进行试验分析,利用分选设备的单机检测结果及重选数学模型计算出分选结果,再通过对产品质量反馈的结果计算末煤入洗量的多少,建立产品的数质量与块煤的分选结果、末煤分流量以及入洗末煤量、粗煤泥量之间的数学模型。在充分考虑了生产工艺和厂房空间位置后,对分流装置进行了重新设计改造,采用三通用平板闸门,用液压驱动,并装有煤流分撒装置,分别在两分叉溜槽上安装了液压插板。针对顾桥选煤厂实际流程,利用RSview32组态软件下开发上位机画面,同时与该厂使用的AB型PLC集中控制系统融为一体,利用控制溜槽中液压插板的开度,从而控制给煤量,给煤量是否符合要求,由电子皮带秤在线测量,数据送入PLC,PLC根据数据模型进行计算控制末煤的量,利用PID反馈控制末煤的量,前馈结合反馈控制,实现末煤洗选量的在线自动控制。 动力煤商品煤的质量动态控制系统的应用能够使末煤的分流量得到控制从而控制末煤的入洗量,实现让其自动加减的功能,相比于以前的洗选工艺,末煤入选量控制的更加合理,系统的稳定性更高,同时体现了人文企业的标准,减少了职工的劳动强度。满足各类不同用户的要求,同时减少煤泥进入洗选系统,以降低洗选成本。更为重要的是,在当前所处的经济条件以及环境下,该技术也不乏是煤炭行业有效的空气污染控制技术。
[Abstract]:The coal blending of the preparation products of the thermal coal preparation plant is an important link in the production of the coal preparation plant, as well as the final link of the product quality control of the coal preparation plant. According to the requirements of the ash content of the product ordered by the user, the coal blending system of the coal preparation plant is used. Thus, the variety diversity and quality stability of commercial coal of thermal coal are improved. With the deterioration of coal quality and the improvement of mechanization degree of coal mining, there are more and more end coal and coarse coal slime. Most of the coal preparation processes in thermal coal preparation plants adopt classification selection and blending coal, in order to meet the requirements of the products ordered by users, General use of product silo coal blending, for the classification of the final coal, the use of a period of time to wash all the coal, a period of time all the end coal into the warehouse. In practice, it is often found that there is an imbalance in coal blending between the clean coal bunker and the final raw coal bunker, that is, the raw coal in the final coal bunker is not enough to be used for coal blending with the clean coal, and the significance of the final raw coal washing is not reaching to the point of increasing the difficulty of coal slurry water treatment. The cost has been raised. In order to change the present situation, the first part of the raw coal can be selected by partial classification, the other part directly into the product warehouse, and finally the coal blending with the selected clean coal. Secondly, a new type of pulverized coal separation device can be developed. Through the test and analysis of the raw coal properties of Guqiao Coal preparation Plant, the separation results are calculated by using the single machine test result of the separation equipment and the mathematical model of gravity separation, and the amount of the final coal washing quantity is calculated through the result of the product quality feedback. The mathematical models between the number and quality of product and the separation result of block coal, the flow rate of coal, the amount of coal washed in and the quantity of coarse coal slime are established. After fully considering the production process and the space position of the workshop, the splitter device was redesigned and reformed. Three universal flat gate gates, hydraulic drive, and coal flow distributor were installed on the two fork chute respectively. In view of the actual flow of Guqiao Coal preparation Plant, the upper computer screen is developed under the RSview32 configuration software. At the same time, it is integrated with the AB type PLC centralized control system used in the plant, and the opening degree of the hydraulic plug plate in the chute is controlled to control the coal supply. Whether the coal quantity meets the requirements is measured online by the electronic belt weigher, and the data is sent to PLC,PLC to calculate and control the quantity of the final coal according to the data model. The PID feedback is used to control the quantity of the final coal, and the feedforward control is combined with the feedback control. Realize the on-line automatic control of the final coal washing amount. The application of the quality dynamic control system of commercial coal of thermal power coal can control the flow rate of the coal to control the washing quantity of the coal, and realize the function of automatically adding and subtracting it, compared with the previous washing process, The system stability is higher, and the standard of humanistic enterprises is embodied, and the labor intensity of workers is reduced. To meet the requirements of different users and reduce the slime into the washing system to reduce the cost of washing. More importantly, in the current economic conditions and environment, this technology is also an effective air pollution control technology in the coal industry.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94
本文编号：2270567
[Abstract]:The coal blending of the preparation products of the thermal coal preparation plant is an important link in the production of the coal preparation plant, as well as the final link of the product quality control of the coal preparation plant. According to the requirements of the ash content of the product ordered by the user, the coal blending system of the coal preparation plant is used. Thus, the variety diversity and quality stability of commercial coal of thermal coal are improved. With the deterioration of coal quality and the improvement of mechanization degree of coal mining, there are more and more end coal and coarse coal slime. Most of the coal preparation processes in thermal coal preparation plants adopt classification selection and blending coal, in order to meet the requirements of the products ordered by users, General use of product silo coal blending, for the classification of the final coal, the use of a period of time to wash all the coal, a period of time all the end coal into the warehouse. In practice, it is often found that there is an imbalance in coal blending between the clean coal bunker and the final raw coal bunker, that is, the raw coal in the final coal bunker is not enough to be used for coal blending with the clean coal, and the significance of the final raw coal washing is not reaching to the point of increasing the difficulty of coal slurry water treatment. The cost has been raised. In order to change the present situation, the first part of the raw coal can be selected by partial classification, the other part directly into the product warehouse, and finally the coal blending with the selected clean coal. Secondly, a new type of pulverized coal separation device can be developed. Through the test and analysis of the raw coal properties of Guqiao Coal preparation Plant, the separation results are calculated by using the single machine test result of the separation equipment and the mathematical model of gravity separation, and the amount of the final coal washing quantity is calculated through the result of the product quality feedback. The mathematical models between the number and quality of product and the separation result of block coal, the flow rate of coal, the amount of coal washed in and the quantity of coarse coal slime are established. After fully considering the production process and the space position of the workshop, the splitter device was redesigned and reformed. Three universal flat gate gates, hydraulic drive, and coal flow distributor were installed on the two fork chute respectively. In view of the actual flow of Guqiao Coal preparation Plant, the upper computer screen is developed under the RSview32 configuration software. At the same time, it is integrated with the AB type PLC centralized control system used in the plant, and the opening degree of the hydraulic plug plate in the chute is controlled to control the coal supply. Whether the coal quantity meets the requirements is measured online by the electronic belt weigher, and the data is sent to PLC,PLC to calculate and control the quantity of the final coal according to the data model. The PID feedback is used to control the quantity of the final coal, and the feedforward control is combined with the feedback control. Realize the on-line automatic control of the final coal washing amount. The application of the quality dynamic control system of commercial coal of thermal power coal can control the flow rate of the coal to control the washing quantity of the coal, and realize the function of automatically adding and subtracting it, compared with the previous washing process, The system stability is higher, and the standard of humanistic enterprises is embodied, and the labor intensity of workers is reduced. To meet the requirements of different users and reduce the slime into the washing system to reduce the cost of washing. More importantly, in the current economic conditions and environment, this technology is also an effective air pollution control technology in the coal industry.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94
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