湿式钙/镁法烟气脱硫自动控制系统

简要介绍了一种湿式烟气脱硫工艺及实施方案,对其PLC自动控制系统的组成及功能进行了系统阐述。该系统性能稳定、安全可靠,提高了脱硫系统的脱硫效率和自动化程度。     

仪表及控制系统在湿法脱硫设计中的运用和优化

根据石灰石/石膏湿法脱硫工艺要求,采用DCS系统为开发平台设计电厂湿法烟气脱硫系统.从控制系统的I/O点配置、硬件配置、网络配置以及仪器仪表测点等方面,介绍了如何合理运用和优化设计.     

电厂脱硫工程控制系统的分析与论证

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。     

现场总线技术在烟气脱硫控制系统中的应用

阐述了一种将FCS与DCS相结合的控制系统-FDCS，并将其应用在火电厂烟气脱硫过程控制系统中。解决了液位控制易失灵、pH值难控制等问题，提高了系统的稳定性，保证了脱硫效率，降低了综合投资成本。     

200MW火电机组烟气脱硫控制系统

简要叙述了石灰石—石膏湿法脱硫工艺，论述和分析FGD主要设备仪表的选型，探讨了控制系统的结构以及系统主要功能的实现，解决了液位控制易失灵、pH值难控制等问题，提高了系统的稳定性，保证了脱硫效率，降低了综合投资成本。     

基于PLC的烟气循环流化床脱硫控制系统

介绍了烟气脱硫控制系统的设计与实现，重点描述了西门子S7—300可编程序控制器在系统中的应用和软件设计思路。     

湿法脱硫真空皮带机运行控制分析与改进

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。     

脱硫石膏综合利用的现状与展望

介绍了国内外脱硫石膏在农业、水泥行业、建材行业和其他方面的综合利用情况,以及脱硫石膏分解技术的研究现状,探讨了分解温度、反应气氛和催化成分等因素对脱硫石膏分解效果的影响,展望了脱硫石膏的应用前景。指出:寻找脱硫石膏综合利用的新途径、找出适合脱硫石膏还原分解的气氛及其分解规律、探索有利于脱硫石膏还原分解的条件,是我国脱硫石膏实现循环利用的必经之路。     

化学法清洗脱硫塔与脱碳塔

合成氨厂半水煤气脱硫塔、变换气脱硫塔及脱碳塔常发生堵塔等现象,尤以半水煤气脱硫塔更为常见,变换气脱硫塔次之,严重影响了生产的正常进行。造成堵塔的因素比较复杂,与脱硫塔内所用填料、脱硫药剂、脱硫液中悬浮硫的多少及生产工艺条件等有关。在半水煤气脱硫中,使用烤胶及浓度高的V2O5脱硫液,发生堵塔的几率比使用其它脱硫药剂相对较大。有些合成氨厂采用降低烤胶、V2O5的浓度,加大脱硫塔直径及增加脱硫液的循环量的方法,以减少脱硫塔发生堵塔的可能性,取得了较好的效果。     

上海火电厂烟气脱硫现状分析与建议

介绍了上海火电厂烟气脱硫的现状,对脱硫工艺选择、脱硫效率进行了分析。阐明了我国烟气脱硫普遍选用的石灰石一石膏湿法脱硫的特点和局限性,探讨了建立SO2排污权交易制度的必要性和可行性,分析了烟气脱硫装置存在的问题及预防措施。     

基于Profibus-DP的废钢破碎线控制系统设计与实现

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。     

火电厂DCS操作员站人机接口画面及其系统设计

针对目前DCS画面尚无设计规范的状况,通过对人机接口画面功能和质量要求的研究,指出火电厂DCS人机接口画面设计存在的问题,并给出相关建议。     

污水处理厂自控系统硬件抗干扰研究

在污水处理厂内,由于污水处理设备分布比较分散,中央控制室与现场设备之间的信号传输线缆长度加大,加之现场干扰源较多,影响了自控系统的稳定运行。因此,要求污水处理厂自控系统硬件必须具有一定的抗干扰能力。分析研究了自控系统硬件在系统集成、安装调试中应采取的抗干扰措施。     

Replacement of a multiple hearth by a fluid bed incinerator the Greensboro case history

The incinerator at the T.Z. Osborne Plant in Greensboro, North Carolina burns sludge from its own waste water treatment plant and sludge pumped from the nearby North Buffalo plant. The two plants have a combined capacity of 36 million gallons per day of wastewater. Because of the age of and increasing high maintenance on the existing multiple hearth incinerator, and the need to increase treatment capacity, the Osborne plant concluded a study in 1992 evaluating its options for future municipal sewage sludge disposal. Options which were evaluated during the study included; (i) rehabilitation of the existing eight-year old multiple hearth unit; (ii) addition of a new multiple hearth; (iii) addition of a new fluid bed system; (iv) drying, composting, or land application. The chosen option, based on both economic and environmental considerations, was a new fluid bed system with a capacity of 2.55 tons per hour, approximately double that of the existing multiple hearth. Design of the new fluid bed system began in December 1994 and equipment delivery for the incineration system was begun in April 1995. Initial operation occurred in August 1996. Primary and secondary sludge, dewatered to 28% dry solids by centrifuge, is delivered by piston pumps to the twenty-foot freeboard ID incinerator. A shell and tube heat exchanger recuperates heat from the exhaust gas and preheats the combustion air to 1250°F, resulting in minimal auxiliary fuel use. The air pollution control device is a high-energy Tandem Nozzle® scrubber. Greensboro was the initial installation of this scrubber design on a fluid bed incinerator and its characteristics and performance are discussed. Ash is dewatered in an ash thickener/belt press system prior to disposal to landfill. The system includes a state of the art Programmable Logic Controller (PLC) system for computer control of the operation. The unit was commissioned in August 1996 and has been in continuous operation since that time except for a one week inspection and maintenance shutdown in February 1999. The plant operates 24 h/day, 7 days per week. The initial performance test showed the system to readily meet federal and state air emission standards. Particulate released was 0.002 grains per dry standard cubic foot, carbon monoxide was 22.5 parts per million volumetric (ppmv) and opacity was 0.4%. These results show a significant emission reduction with the fluid bed when compared to the multiple hearth. Annual tests conducted since then and continuous emission monitoring have shown the unit to be in consistent compliance. Since the fluid bed system became operational, the old multiple hearth system has been maintained on standby as a backup, but its use has not been required. Operational experience is discussed, the most interesting of which is the relatively trouble-free operation. The minor problems which occurred and their solutions are detailed. Also included is a comparison of operation and maintenance experience of the fluid bed and the multiple hearth. Current sludge disposal actual cost data are also provided including the average cost per ton of dry solids treated. The almost three years of operational experience to date has shown that the decision to install a new fluid bed system was the correct one on both an environmental and economic basis. It has provided benefits to all interested parties — the wastewater treatment plant, the regulators, the taxpayers, and the surrounding community.     

催化氧化法处理含氨工业废气的应用探索

采用催化氧化工艺处理某化工厂的含氨工业废气,设计了一体式催化氧化脱氨设备,在物料与热量衡算的基础上,进行了脱氨性能测试和能耗分析。结果表明:工业化应用的一体式催化氧化设备在处理中浓度含氨废气时,可通过完善的可编程逻辑控制器(PLC)自动调节控制系统、高效的换热器以及智能化的前端补新风和阻火预处理装置,解决安全和能耗问题;该一体化设备具有很高的脱氨效率和经济性,处理后的废气满足GB 16297—1996《大气污染物综合排放标准》和GB 14554—1993《恶臭污染物排放标准》中的相关规定,应用前景较好。     

70 kt/a硫磺生产装置除尘系统的设计与研究

概述了硫磺粉尘回收系统的研究现状，简要介绍了一套较为成功的设计方案和几个关键设计环节，指出院 今后推广应用的研究重点和发展趋势，该设计方案突出的特点为：防爆性能好的高效多管式旋风除尘器的设计，对管网和排风罩的优化防爆设计，多层次的防爆抑爆设施的设计。     

燃料乙醇行业环境污染控制评价指标体系的构建

在分析我国燃料乙醇行业基本信息的基础上,根据其原料特性、生产规模、生产技术、污染控制措施、环境管理等方面的特点,筛选出合适的指标,构建多层次燃料乙醇行业环境污染控制评价指标体系。运用层次分析法确定指标权重分值,建立燃料乙醇行业环境污染控制评价模型,并选取国内燃料乙醇典型企业进行调研,结合行业现状对该指标体系做出合理性和可行性分析。