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1.
介绍了真空皮带机脱水过程的基本原理及其在石灰石—石膏湿法脱硫系统中的应用情况,分析了PID控制真空皮带机运行的原理。由于真空皮带机常规PID控制系统的滞后严重,采用模糊控制后系统的响应得到了较好的改善,实际应用结果证明了理论的正确性。  相似文献   

2.
借助系统分析的原理,从区域大气环境容量入手,以浓度控制、P值控制与总量控制相结合为基本方法,建立起“三个削减量”和“一个系数”为技术核心的大气污染总量控制模式,并首次将费用函数应用于其中,寻求满足环境、技术、经济约束,且使区域总投资最小的污染物总量控制方案。  相似文献   

3.
燃煤工业锅炉是我国SO2污染的第二大污染源,仅次于燃煤发电厂。控制燃煤工业锅炉SO2污染,对控制我国大气环境SO2具有极其重要的意义。应用传统的控制方法及技术,即旋风除尘器、水膜除尘器及烟气脱硫技术,很难控制燃煤工业锅炉的SO2污染,其经济效益、环境效益和社会效益也很差。研究表明,只有采用清洁燃料,淘汰小锅炉,采用工业固硫型煤、水煤浆、应用循环流化床洁净燃烧技术和烟气脱硫技术,才能经济有效地控制燃煤工业锅炉SO2污染。  相似文献   

4.
概述了二恶英、重金属、酸性气体、灰渣等垃圾焚烧的主要污染物,以二段式(往复)焚烧炉为例,介绍了炉排炉焚烧处理工艺和污染控制设备。提出通过控制垃圾焚烧条件、尾气处理以及吸附等方法,可以有效控制二恶英类污染物的排放;重金属的控制可以用除尘器或使用相应的吸附剂处理;采用较为成熟的烟气处理技术,可以控制处理酸性气体;灰渣可采用固化稳定化或酸提取法处置。  相似文献   

5.
给水泵小汽轮机的转速摆动是给水系统中常见的问题,引起的原因有测量不准、PID参数整定不当、伺服系统故障等多个方面。介绍了衡水电厂3B给水泵汽轮小机转速摆动故障的分析解决过程,分析了EH油质对电液伺服系统的重要性,提出了相关检修维护注意事项。  相似文献   

6.
新的《火电厂大气排放标准》的颁布实施,燃煤电厂汞的排放正式纳入控制标准。针对目前我国燃煤电厂汞排放化学形态转换、排放特征,分析和总结现有污染控制设施对汞协同控制效果,提出适合我国国情的燃煤电厂汞控制技术措施的建议及发展趋势,可有效控制燃煤电厂汞的排放量。  相似文献   

7.
浅论水污染物排放总量控制   总被引:1,自引:0,他引:1  
王英贤 《化工环保》1994,14(3):171-175
阐述了总量控制的含义及其重要性,并从总量控制的实质出发,提出实现总量控制的两条技术路线、实施方案和程序,最后就如何实施总量控制提出几点看法。  相似文献   

8.
近年来,燃煤电厂烟气中的汞成为继SO2、NOx和烟尘之后又一公认的大气环境污染物,我国已正式立法控制燃煤电厂汞排放,这使得燃煤电厂汞排放技术的研究迫在眉睫。不同形态汞的理化性质不同,元素态汞( Hg0)较之氧化态汞(Hg2+)和颗粒态汞(Hgp)更难去除,因此,脱汞的前提是提高Hg0的氧化率。介绍并简单分析了目前国内外已有的汞排放控制技术:燃烧前控制(清洁燃煤发电技术)、燃烧中控制(煤基添加剂技术和炉膛喷射技术),和燃烧后控制(利用现有的烟气控制设备协同控制),并对我国脱汞技术发展方向提出了展望。  相似文献   

9.
基于日趋严峻的环境形势和严格的排放标准,面向燃煤电站多污染物控制过程,详细分析燃煤电站现有环保设施多污染物控制规律。针对协同控制过程中存在的问题,研究湿式烟气多污染物协同控制技术及对策,为实现污染物达标排放和电力工业绿色发展、循环发展和低碳发展提供技术支撑。  相似文献   

10.
按照区划原则,中国东部、中部地区是现阶段国家火电NOx总量控制区域,并将国家火电NOx总量控制分为初级、中级、高级和可持续发展4个阶段。环境保护具有显著的区域性及阶段性的特点,由于我国东部、中部、西部地区经济发展水平的不平衡,环境保护也呈梯度变化的规律。通过对4个阶段特征的归纳与提炼,为国家不同时期总量控制区域范围的划分和总量控制目标的制定提供参考价值。  相似文献   

11.
As there is only rare and scattered published information about the process control in industrial incineration facilities for municipal solid waste (MSW), a survey of the literature has been supplemented by a number of waste incineration site visits in Belgium and The Netherlands, in order to make a realistic assessment of the current status of technology in the area. Owing to the commercial character, and therefore, the confidentiality restrictions imposed by plant builders and many of the operators, much of the information collected has either to be presented in a generalized manner, and in any case anonymously. The survey was focused on four major issues: process control strategy, process control systems, monitors used for process control and finally the correlation between the 850 degrees C/2 s rule in the European waste incineration directive and integrated process control. The process control strategies range from reaching good and stable emissions at the stack to stabilizing and maximizing the energy output from the process. The main indicator to be monitored, in cases in which the focus is controlling emissions, is the oxygen content in the stack. Keeping the oxygen concentration in a determined range (usually between 8 and 12 vol.%) ensures stable and tolerated concentrations of the gaseous emissions. In the case for which stabilization of energy production is the principal aim, the main controlled parameter is the steam temperature and flow-rate, which is usually related to the fuel energetic input. A lot of other parameters are used as alarm criteria, the most common of which is the carbon monoxide concentration. The process control systems used most commonly feature partially automated classical proportional integral derivative (PID) controllers. New and innovative process control systems, such as fuzzy-logic control systems, are still unknown to most plant managers while their performance is reported to be unsatisfactory in plants in which such systems have been tested or are in use. Monitoring components used in process control are still based on classical tools such as thermocouples. The use of modern and more reliable sensors is very limited due to the high initial investment cost or simply the fear of using non-standard technologies. Complying with the 850 degrees C/2 s rule in the European waste incineration directive generally is seen to be a handicap for the process control, either in terms of cost, or flexibility of reaction, or both, particularly in old incineration facilities where such restrictions were not planned in the design.  相似文献   

12.
结合石灰石-石膏湿法烟气脱硫控制系统的特点,通过比较DCS和PLC两种系统控制器的处理能力、数据通信、组态维护、人机交换装置、安全性以及发展方向等,给出了脱硫控制系统选型建议。  相似文献   

13.
In this paper a feasibility study is presented on the application of the advanced control strategy called model predictive control (MPC) as a tool for obtaining improved process operation performance for municipal solid waste (MSW) combustion plants. The paper starts with a discussion of the operational objectives and control of such plants, from which a motivation follows for applying MPC to them. This is followed by a discussion on the basic idea behind this advanced control strategy. After that, an MPC-based combustion control system is proposed aimed at tackling a typical MSW combustion control problem and, using this proposed control system, an assessment is made of the improvement in performance that an MPC-based MSW combustion control system can provide in comparison to conventional MSW combustion control systems. This assessment is based on simulations using an experimentally obtained process and disturbance model of a real-life large-scale MSW combustion plant.  相似文献   

14.
介绍了有源电力滤波器控制策略,提出了PWM控制技术在电网电压畸变情况下对电网中滤波电流进行连续动态补偿。建立了PWM控制的逆变系统模型并进行仿真研究,结果验证了该控制策略能有效补偿谐波电流。  相似文献   

15.
对煤中砷的赋存状态及煤在燃烧后砷的转化行为进行了分析,并分别从煤的物理洗选、抑制煤中砷元素的挥发、气态砷吸附剂和污控设备协同脱砷等方面,重点论述了国内外对燃煤电厂砷排放控制的最新研究进展。同时提出了控制砷排放的新思路,为今后脱砷技术的进一步研究指明了方向。  相似文献   

16.
电厂燃煤过程中汞控制技术研究   总被引:3,自引:0,他引:3  
燃煤电厂汞控制技术分燃烧前、燃烧中和燃烧后脱汞,燃烧后脱汞技术为主要汞控制排放工艺,其中吸附剂吸附方法的研究较为广泛。基于国内外近几年燃煤电厂烟气脱汞技术的研究,综述了汞控制技术的最新进展。  相似文献   

17.
江苏鼎豪再生资源设备有限公司2012年成功开发了大型废钢破碎线,采用PLC并基于Profibus-DP总线构成监督控制与采集(SCADA)系统。用模糊控制思想实现了破碎机的自动加料控制,并采用组态软件WINCC开发了操作、监控界面,在控制室实现了对整条破碎生产线进行控制与监控。  相似文献   

18.
电厂脱硫工程控制系统的分析与论证   总被引:3,自引:0,他引:3  
简要阐述了脱硫技术的发展过程及其工艺过程的控制特点,论述和分析了脱硫控制的几种选型方案。比较和论证了DCS控制和PLC现场总线的区别和性价比。提出的方案和结论旨在为电厂新建、扩建或改造的脱硫项目建立控制系统提供重要的技术保障。  相似文献   

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