电厂给水泵变频改造研究
发布时间：2018-08-13 18:25
【摘要】：“求生存，促发展”是电力企业的立足之本，在面对“厂网分开，竞价上网”的局面，如何降低发电成本，争取到更大的电力市场，成为每个电力企业必须思考的问题。 目前火力发电厂中的大量高功率辅机都存在着耗电量大的问题，而这些辅机所属的系统大多是采用出口挡板或调节门进行截流调节的，这就存在大量的能源损耗，也是电厂厂用电率居高不下的重要因素。而高压变频器的应用，可以使给水泵电机在电厂持续发电过程中，根据负荷的变化高效的改变出力，从而节约大量电能，获得较工频运行状态下无选择最大出力所无法得到的可观的经济效益。 本文认真研究了给水泵及锅炉给水系统存在的耗能问题，分析了电动机的节电机理，比较了液力耦合器调速与变频器调速的特点，通过对国内另外两家电厂给水泵变频改造实例进行了比较研究，并结合某电厂的实际，对该电厂的给水泵进行了变频改造，其中主要包括系统主回路的改造、前置泵的改造、液力耦合器及供油系统改造、高压变频器的配置、高压变频器散热系统的安装，而且在原来基础上修改和完善了相应的给水泵控制系统逻辑。改造完成后，在对实际运行数据观测的基础上，详细的分析了变频改造的节能及应用效果。结果证明，，高压变频器在火力发电企业的大功率辅机应用上可以有效降低能耗，降低辅机维修周期，改善现场噪音环境，对高压变频技术在电力企业中的推广应用具有很大的借鉴作用。
[Abstract]:"seeking survival and promoting development" is the base of electric power enterprises. In the face of the situation of "separation of power plants and networks, bidding for the Internet", how to reduce the cost of generating electricity and win over a larger electricity market has become a problem that every power enterprise must consider. At present, a large number of high power auxiliary machines in thermal power plants all have the problem of high power consumption, and most of the systems to which these auxiliary machines belong are controlled by exit baffles or regulating doors, so there is a large amount of energy loss. It is also an important factor of high power consumption rate in power plants. The application of high voltage frequency converter can make feed pump motor in the process of continuous power generation, according to the change of load, the power can be changed efficiently, thus saving a lot of electric energy. The considerable economic benefits can not be obtained without the maximum selective force under the operation condition of power frequency. In this paper, the problem of energy consumption in feed water pump and boiler feedwater system is studied, the mechanism of electric saving of motor is analyzed, and the characteristics of speed regulation of hydraulic coupler and frequency converter are compared. By comparing and studying the examples of frequency conversion transformation of feedwater pump in other two domestic power plants, and combining with the actual situation of a power plant, this paper carries on the frequency conversion transformation of feed water pump in this power plant, which mainly includes the transformation of the main circuit of the system and the retrofit of the front pump. The modification of hydraulic coupler and oil supply system, the configuration of high voltage inverter, the installation of heat dissipation system of high voltage converter, and the modification and perfection of the logic of feed water pump control system on the basis of the original. On the basis of observation of actual operation data, the energy saving and application effect of frequency conversion transformation are analyzed in detail. The results show that high voltage inverter can effectively reduce energy consumption, reduce the maintenance cycle of auxiliary machines and improve the noise environment in the field. It can be used for reference in the application of high voltage frequency conversion technology in electric power enterprises.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621
[Abstract]:"seeking survival and promoting development" is the base of electric power enterprises. In the face of the situation of "separation of power plants and networks, bidding for the Internet", how to reduce the cost of generating electricity and win over a larger electricity market has become a problem that every power enterprise must consider. At present, a large number of high power auxiliary machines in thermal power plants all have the problem of high power consumption, and most of the systems to which these auxiliary machines belong are controlled by exit baffles or regulating doors, so there is a large amount of energy loss. It is also an important factor of high power consumption rate in power plants. The application of high voltage frequency converter can make feed pump motor in the process of continuous power generation, according to the change of load, the power can be changed efficiently, thus saving a lot of electric energy. The considerable economic benefits can not be obtained without the maximum selective force under the operation condition of power frequency. In this paper, the problem of energy consumption in feed water pump and boiler feedwater system is studied, the mechanism of electric saving of motor is analyzed, and the characteristics of speed regulation of hydraulic coupler and frequency converter are compared. By comparing and studying the examples of frequency conversion transformation of feedwater pump in other two domestic power plants, and combining with the actual situation of a power plant, this paper carries on the frequency conversion transformation of feed water pump in this power plant, which mainly includes the transformation of the main circuit of the system and the retrofit of the front pump. The modification of hydraulic coupler and oil supply system, the configuration of high voltage inverter, the installation of heat dissipation system of high voltage converter, and the modification and perfection of the logic of feed water pump control system on the basis of the original. On the basis of observation of actual operation data, the energy saving and application effect of frequency conversion transformation are analyzed in detail. The results show that high voltage inverter can effectively reduce energy consumption, reduce the maintenance cycle of auxiliary machines and improve the noise environment in the field. It can be used for reference in the application of high voltage frequency conversion technology in electric power enterprises.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621
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