灵州电厂厂用电节能改造分析

发布时间：2018-09-12 05:37

【摘要】：当前,我国电力供应以火力发电为主,火力发电厂每年燃用的动力煤占社会用煤总量的40%以上。循环流化床锅炉火电机组可以使用煤炭开采及洗煤过程中产生的劣质煤作为燃料,有利于改善矿山环境污染,实现资源综合利用。但循环流化床锅炉火电机组与同容量煤粉炉火电机组相比,能耗高、运维费用高,在当前电力交易市场化的环境下企业竞争力明显不足。因此,研究如何有效降低循环流化床锅炉火电机组厂用电率,对提高循环流化床锅炉火电机组企业经济效益有着重大的意义。本文结合灵州电厂2×135MW循环流化床锅炉火电机组近年对厂用电系统实施的一系列节电改造实例,详细介绍了一次风机、凝结水泵、循环水泵及电除尘器节电改造的能耗分析、可行性研究、改造方案确定及改造效果评估等环节。通过项目实施,实现了技术改造的预期目标,降低厂用电率约0.4%,辅机节电效果大于25%,每年为企业增加效益150余万元。本文介绍的灵州电厂火电厂辅机变频改造、双速改造、电除尘器高频电源改造项目与灵州电厂原设计相比,实现了辅机设备用电节能创新,尤其是循环水泵双速改造在同类型火电机组中应用不多,在北方四季温差较大的地区采用,节电效果尤为明显,本课题的研究及工程实施与示范将对循环流化床锅炉火电行业降低厂用电率,提升企业经济效益具有一定参考意义。
[Abstract]:At present, the power supply in our country is dominated by thermal power generation, and the thermal power plants burn more than 40% of the total coal used in the society every year. The inferior coal produced in coal mining and coal washing process can be used as fuel for circulating fluidized bed boiler thermal power unit, which is helpful to improve mine environment pollution and realize comprehensive utilization of resources. However, the circulating fluidized bed boiler thermal power unit has higher energy consumption and higher operating and maintenance costs than the same capacity pulverized coal boiler thermal power unit, which is obviously insufficient in the current electricity trading market environment. Therefore, it is of great significance to study how to effectively reduce the power consumption rate of circulating fluidized bed boiler thermal power unit to improve the economic benefit of circulating fluidized bed boiler thermal power unit. Based on a series of examples of power saving reformation of 2 脳 135MW circulating fluidized bed boiler unit in Lingzhou Power Plant in recent years, the energy consumption analysis of primary fan, condensate pump, circulating pump and electric precipitator is introduced in detail in this paper. Feasibility study, determination of transformation scheme and evaluation of modification effect. Through the implementation of the project, the expected goal of technical transformation has been realized, the power consumption rate of the auxiliary unit has been reduced by about 0.4, the power saving effect of auxiliary machine has been more than 25 percent, and the benefit has been increased by more than 1.5 million yuan per year for the enterprise. In this paper, compared with the original design of Lingzhou Power Plant, the transformation of auxiliary machine frequency conversion, double speed transformation and high frequency power source reconstruction of electrostatic precipitator in Lingzhou Power Plant has realized the innovation of electric energy saving of auxiliary equipment. In particular, the dual-speed revamping of circulating water pumps is not widely used in the same type of thermal power units, and it is used in areas with large temperature differences in the four seasons in the north, and the effect of electricity saving is particularly obvious. The research and project implementation and demonstration of this subject will have certain reference significance for the CFB boiler thermal power industry to reduce the power consumption rate and to improve the economic benefits of enterprises.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM621

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