怀安电厂电动给水泵变频改造及节能分析

发布时间：2018-09-04 09:44

【摘要】：近年来随着环境资源的日益枯竭、环境污染问题日益严重以及温室气体排放引起的全球气候变暖等问题备受国际社会广泛关注,节约一次能源也成为了我国的重要国策。我国电源结构中,火电装机容量依然占主导地位,火电发电在能源系统中扮演重要角色,但火电厂同时也是重要的电能消耗大户,其消耗包括煤耗和厂用电率两个部分。发电厂厂用电多由其辅机消耗,其中电动给水泵的耗电量约占发电厂厂用电率的20~30%。因此,对电动机水泵进行节能改造对降低发电厂厂用电率以及煤耗有重要意义,同时也是降低发电企业成本的重要措施。国电怀安热电有限公司的机组为2×330MW燃煤直接空冷供热机组,给水系统配置3台50%BMCR容量液力耦合器调速电动给水泵,正常运行方式为两运一备。由于给水泵的耗电量较大,有较大的节能潜力。本文主要针对国电怀安热电厂,提出相应的给水泵变频节能改造策略,并进行了以下研究:1)从给水泵的基本特点入手,分析了给水泵调速技术的节能原理,在此基础上对各种电机调速方法进行分类,并对其基本原理、应用场合、优缺点等方面进行了分析和论述。通过能量传递效率以及技术性能的比较发现,变频调速相比于其他调速方式具有明显的节能优势和技术经济优势。2)针对给水泵变频改造实际案例进行调研,以已完成变频改造的马莲台电厂为参考,从变频改造前后给水泵的耗电量、变频改造的可靠性、液力耦合器改造、控制系统等方面出发,对怀安热电厂变频改造的可行性分析。3)从国电怀安电厂电动给水泵的变频节能改造方案入手,分别对变频装置的选型、技术要求、参数配置等进行了详细的分析。在此基础上,结合怀安电厂#1和#2机组给水泵的实际情况,完成了变频设备选型、散热方案选择、电源及接地方案选择以及变频改造的实施,并测试了各个设备的功能指标完成情况。最后通过变频改造前后的试验数据对比,进行了节能效果分析。
[Abstract]:In recent years, with the increasing depletion of environmental resources, environmental pollution and global warming caused by greenhouse gas emissions have attracted extensive attention of the international community. Saving primary energy has also become an important national policy of our country. Thermal power generation plays an important role in the energy system, but the thermal power plant is also an important consumer of power consumption, which includes coal consumption and auxiliary power consumption. The power consumption of the power plant is mostly consumed by its auxiliary machine, and the electric feedwater pump accounts for about 20% of the power consumption rate of the power plant. Therefore, it is of great significance to reduce the power consumption rate and coal consumption of the electric motor and pump, and is also an important measure to reduce the cost of power generation enterprises. The unit of Huai'an Thermal Power Co., Ltd is 2 脳 330MW coal-fired direct air-cooled heating unit. The feed water system is equipped with three 50%BMCR hydraulic coupler speed regulating electric feedwater pumps. The normal operation mode is two operation and one standby. Due to the large power consumption of the feed pump, there is a great potential for energy saving. Aiming at Huai'an Thermal Power Plant of Guodian Power Plant, this paper puts forward the corresponding retrofit strategy of variable frequency energy saving of feed water pump, and carries out the following research: 1) starting with the basic characteristics of feed pump, analyzes the principle of energy saving of speed regulation technology of feed water pump. On this basis, various motor speed regulation methods are classified, and its basic principle, application situation, advantages and disadvantages are analyzed and discussed. Through the comparison of energy transfer efficiency and technical performance, it is found that frequency conversion speed regulation has obvious advantages of energy saving and technical and economic advantages compared with other speed regulation modes. With the reference of Malintai Power Plant, which has completed the transformation of frequency conversion, from the aspects of power consumption of feed water pump before and after frequency conversion transformation, reliability of frequency conversion transformation, revamping of hydraulic coupler and control system, etc. The feasibility analysis of frequency conversion transformation of Huai'an thermal power plant. 3) starting with the conversion and energy saving reconstruction scheme of electric feed water pump in Huai'an Power Plant, the selection of frequency conversion device, technical requirements and parameter configuration are analyzed in detail. On this basis, combined with the actual situation of feed water pump of #1 and #2 units in Huai'an Power Plant, the selection of frequency conversion equipment, the selection of heat dissipation scheme, the selection of power supply and grounding scheme and the implementation of frequency conversion transformation are completed. The performance of each equipment was tested. Finally, the energy-saving effect is analyzed by comparing the test data before and after the transformation of frequency conversion.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621

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