变频器在风机控制变频调速系统中的应用

风机设备应用广泛,锅炉燃烧系统、通风系统和烘干等系统中都有所应用,变频器的运行控制方式采用U/f控制方式.变频器外部FWD控制模式,选择X4、X5端子控制,端子的通断实现变频器的升降速,变频器一旦发生故障,风杌由变频运行切换为工频运行的控制,实现风机工频运行.     

变频器在多台风机起动，调速系统中的应用

对在棉花加工等行业中个有推广价值的单台变频器多台风机起动,调速系统的组成和工作原理作了详细的说明。     

变频调速技术在热风疏水系统中的应用

分析了传统的热网疏水系统中,节流调节存在的种种缺陷。为了从根本上解决系统长期不能正常运行的疑难问题,提高系统的安全性和经济性,采用变频调速系统替代节流调节,对系统进行了改造,保证了疏水系统的正常安全运行。具有设备性能价格比高,运行稳定可靠、自动化程度高、节能效果效果等特点。     

智能继电器在静电除尘器低压系统中的应用

介绍电器控制的新式智能继电器,以及用智能继电器完成静电除尘器配套的电动机、加热器等设备的智能控制,构成网络式静电除尘器低压控制系统,提高了低压控制装置的可靠性和自动化程度,实现运行的自动化管理。     

变频调速技术在热网疏水系统中的应用

分析了传统的热网疏水系统中,节流调节存在的种种缺陷。为了从根本上解决系统长期不能正常运行的疑难问题,提高系统的安全性和经济性,采用变频调速系统替代节流调节,对系统进行了改造,保证了疏水系统的正常安全运行。具有设备性能价格比高、运行稳定可靠、自动化程度高、节能效果显著等特点。     

锅炉风机变频调速技术改造

对风机采用变频调速控制与传统调节方式进行对比,认为变频调速节能效果较好,介绍风机变频调速的节能原理,分析风机变频调速的节能效益,探讨改造中涉及的技术问题及相关对策。     

新型静电除尘器在电厂输煤系统中的应用

通过对火力发电厂输煤系统各种除尘方式进行比较,认为在火力发电厂输煤系统中利用新型高效静电除尘器除尘不仅大大提高除尘效率,而且节省劳力,提高运行的可靠性和稳定性,自动化程度大大提高。     

变频调速技术在风机节能中的应用

介绍变频调速的基本原理,通过变频调速技术在高井热电厂吸风机上的实际应用,分析了变频调速技术显著的节能效果。     

HARSVERT高压变频调速系统在电厂风机上的应用

华蓥山发电厂 2× 1 0 0MW机组 8台引送风机相继改造为HARSVERT -A0 6 / 1 0 5高压变频调速系统控制 ,技术先进 ,控制功能强 ,节能效果显著 ,运行稳定可靠 ,提高了设备健康水平     

变频调速系统在转炉风机上的节能应用

简述了转炉风机的调速要求 ,对系统调速方案进行了比较论述。说明了电机变频调速运行的控制特性 ,并对风机变频改造后的节能效果进行了分析。     

Fuzzy-logic-based power control system for multifield electrostatic precipitators

The power consumption of large precipitators can be in the range of 1 MW and above. Depending on the dust load properties, the electrical power may be reduced by up to 50% by applying fuzzy logic, without significantly increasing the dust emissions. The new approach uses fuzzy logic for optimization of existing electrostatic precipitators. The software runs on a standard personal computer platform under the Windows NT operating system. The controllers of the electrostatic precipitator power supplies are linked to the personal computer via an industrial network (e.g., PROFIBUS). The system determines online the differentials of emission versus electrical power of each field. This measurement is difficult because of overlaid events in the other zones, and process changes. The long response, time of the resultant dust emission due to electrical power changes in the precipitator is an additional complication. Rules were defined for a coarse, but fast-response power adaptation of all zones. Fine tuning the running system after the coarse optimization increased the accuracy and reliability. When installed on a 4/spl times/5 zone precipitator in a power station, significant results were obtained. The power savings over three months of operation were in the range of 40%-60% depending on the load and fuel characteristics. Data were recorded over the test period of three months. The results are presented.     

新型高效静电除尘器在火力发电厂输煤系统中的应用

通过对火力发电厂输煤系统3种除尘方式在设备初投资、长期运行费用以及维护管理的繁简程度方面进行比较,认为在火力发电厂输煤系统中采用新型高效静电除尘器除尘不仅能大大地提高除尘效率．节省劳动力,并且设备运行的可靠性、稳定性和自动化程度也较高。     

变频调速技术在恒压供气系统中的应用

介绍了变频调速自动控制原理,以及变频器在恒压供气系统中的设计、选型、应用。阐述了该系统的组成、工作原理及节能方面。     

Ozone generation in DC-energized electrostatic precipitators

Ozone emissions from a short wire-plate precipitator and three commercial electronic air cleaners were measured. Ozone generation was most strongly affected by the corona current and polarity of the discharge electrode. To a lesser extent, the type of corona (i.e. whether tuft or glow) was also important. Water vapor seems to reduce the ozone emission rate for negative corona, but ozone emissions from positive coronas are relatively unaffected. Ozone emission rate was also affected by the radius of the discharge electrode     

倒棱机的自动控制与调速系统

倒棱机的自动控制与调速系统涉及可编程控制器、直流调速系统、变频器、电子凸轮开关等自动化设备 ,这些自动化设备之间协调配合非常重要。为使设备运行最佳化 ,修改了可编程控制器的程序、增加了辊道的变频调速 ,使设备性能大为改善 ,系统的稳定性显著提高     

Application of different types of high-voltage supplies on industrial electrostatic precipitators

Investigations of the requirements for high-voltage (HV) power supplies for zones within an electrostatic precipitator (ESP) were conducted with regard to the properties of different technologies for HV generation. The zones of an ESP show different electrical behavior and efficiency. This is a result of: 1) the different dust loads of the zones; 2) the particle size and properties; and 3) the possibility of charging the particles in the entire zone using suitable technology. An overview of common and new topologies of HV supplies and their typical properties is given. It is shown how these properties can be used to match the requirements of the different zones of an ESP regarding the actual operating conditions. Large particles and high dust loads can be addressed effectively using high-frequency dc power supplies. Fine particles, however, can be separated even more efficiently by pulsed power supplies. Additionally, the power consumption of different HV sources has been investigated in relation to the separation efficiency. Experimental results were obtained on an industrial ESP containing 3 zones in a sinter plant and on a large scale precipitator in a fossil power plant, containing 30 zones. It was shown that a high frequency IGBT inverter combined with a microsecond-pulsed power supply significantly improved the overall performance of the precipitator.     

基于PLC的串级调速系统在全速状态下的故障处理

本串级调速系统在工业控制领域里占据着重要的位置,特别是在异步电机调速领域。传统的控制系统采用单片机作为控制元件,但是由于单片机自身的易损坏性和抗干扰能力差的特性,使其在工作环境恶劣时容易使控制系统不稳定甚至遭到破坏。PLC由于其抗干扰能力强和易于编程等特性,在电机调速领域迅速得到了广泛应用,本文将重点论述PLC控制系统在电机全速状态下发生故障时所采取的相关操作以显示PLC控制系统的优质特性。     

PLC和变频调速控制的静动叶结合型旋转式粗粉分离器

结合南京热电厂5号机组制粉系统的工程实际,利用PLC和变频调速技术,对制粉系统的关键设备——静动叶结合型旋转式粗粉分离器的电气控制系统进行了研制。该控制系统能满足电厂运行的具体要求,取得了良好的实际效果。     

燃煤电厂静电除尘器改造方案

随着我国环保标准日益严格，很多燃煤电厂静电除尘器已不能满足排放标准的要求，需进行改造。该文首先分析了造成静电除尘器除尘效率低下的主要原因；提出3种改造方案：增加电场；改造为袋式除尘器；改造为静电袋式复合除尘器。并从技术性能和经济性2个方面对3种改造方案进行了比较．以郑州热电厂200MW机组静电除尘器改造为例对3种方案进行了对比分析．结果表明：改造为静电袋式复合降尘器的方案是静电除虫器改造的最佳方案，并认为静电袋式复合除尘是我国除尘技术来来的发展方向之一。