高炉煤气燃烧锅炉控制系统的优化

锅炉控制系统控制的好坏关系着燃烧经济性和运行安全性。本文介绍了热电厂锅炉控制系统中的各个控制回路,并着重对高炉煤气燃烧锅炉控制系统进行分析和优化。     

欧陆微机数采系统在锅炉生产监控中的应用

１　系统构成我厂有４台２０ｔ工业锅炉，并有检测参数１００多点，控制回路主要进行锅炉汽包水位调节和锅炉燃烧系统控制。根据工艺要求每台锅炉必须单独监控，独立显示，又要能够集中监控和显示、记录。控制系统采用欧陆计算机数采系统监控网络结构，如图１所示。其中Ｔ３０００ＤＳ计算机工作站除用于程序开发、画面处理以及参数修改外，还可以用作实时运行和显示操作。Ｔ３０００ＲＤ计算机工作站，只用于实时运行操作和参数修改。Ｔ６４０调节回路控制器，用于实现调节系统的控制策略。４１８０Ｍ智能记录仪，用于过程数据的处理、显示…     

工业锅炉交叉限幅燃烧优化控制

工业锅炉是我国目前应用面宽、数量多的耗用一次能源的重要设备,每年消耗原煤达2亿多吨。锅炉运行效率的好坏对于我国节能具有重大经济意义。当前,我国中小型锅炉广泛采用链条炉排式,锅炉实际运行热效率远低于设计效率。造成热损失大的因素虽然很多,但与工业锅炉上没有建立起一套合理的实际可行的燃烧控制系统有很大关系。针对我国中小型锅炉实际情况,我们对SHL20-1320t/h工业锅炉采用了先进的分布控制,上位机采用1BM-PC计算机,下位机采用了SIMATICS5-605μ可编程控制器,成功地实施了燃烧优化控制,提     

160T／h工业煤粉锅炉智能集成控制技术的开发

针对锅炉生产过程中运行情况复杂,条件多变,为达到提高锅炉运行效率和燃烧效率,节约能源,提高锅炉运行的稳定性,研发了该智能集成控制系统。该系统是基于Rockwell公司的ControlLogix和RSVIEW组态开发环境,实现了过程控制软件的设计,包括连锁控制、基础回路控制和协调控制。     

燃气热水锅炉负荷调节控制系统的设计

对燃气热水工业锅炉燃烧控制系统的构成、控制原理进行了深入研究,介绍了一种先进的控制方案,即结合燃气流量计来精确控制燃气流量和空气流量的方法,实现了精确的空燃比控制,改善了燃烧性能,提高了燃烧系统的控制精度。     

JX-300X专家控制系统在锅炉燃烧过程中的应用

介绍了采用 JX-3 0 0 X专家控制系统对 75 t/h循环流化床锅炉燃烧过程进行自动控制的方法。通过应用专家智能控制系统 ,提高了锅炉的自控投运率和控制效果 ,提高了系统的运行可靠性     

模糊PID控制在工业锅炉控制系统中的应用

针对工业锅炉控制系统的特点,采用将常规PID控制与模糊控制相结合的控制策略,在常规PID调节器的基础上,采用模糊推理思想,根据不同的E、EC对PID参数Kp、Ki、Kd进行自校正。对锅炉汽包液位的控制表明这种模糊PID控制器可明显提高系统的性能。     

俄制500 MW机组锅炉送、引风机控制系统改造实践

针对某发电公司俄制机组锅炉送、引风机控制系统存在可靠性低、保护联锁功能不完善、运行人员劳动强度大等诸多问题,对其进行改造,送、引风机控制系统就地分别安装1套油站控制设备、1套振动监测系统、1套动叶调整设备以及电机温度检测元件。改造后,送、引风机及油站控制系统全部引入临近的DCS远程站,实现了远程操作、控制、监视等功能,优化了炉膛压力控制回路,提高了风机控制系统的可靠性,同时减少了运行人员的劳动强度。     

全燃气工业蒸汽锅炉的自动化控制过程实现

结合天津钢铁公司14t/h锅炉计算机控制系统,论述了蒸汽锅炉计算机控制系统的工作原理,锅炉控制中的几个重要的控制回路,及各个环节控制的实现方法。     

广钢二期电站锅炉燃烧管理控制系统的技术改造

锅炉燃烧管理控制系统是用于发电厂锅炉燃烧运行的安全监控及保护装置。通过对二期电站BMS系统的技术改造,采用PC-PLC组合替代原来的BMS系统,并对系统程序进行优化,提高了BMS系统工作的可靠性、诊断能力、抗干扰能力和稳定性,能锁定锅炉和重要设备的首发原因。在类似锅炉控制系统改造中有推广价值。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

显微维氏硬度测量不确定度评定

对显微维氏硬度测量不确定度进行评定，建立了不确定度计算的数学模型，确定了影响实验结果的各项因素，计算出了各因素的标准不确定度，得出结果的扩展不确定度，并给出最终测量结果的表达式。     

Concept of freedom of infection of animal flocks

Totally negative results of epidemiological investigation of random samples do not prove the absence of the infection as the pathogen may be restricted to only a few animals in the herd for a long time. The statement "absence of infection" is critical for such situations. The question is raised, whether the statement "absence of infection" should be generally avoided. Classification of herds and flocks according to the prevalence of the pathogen would be more valid for the implementation of control measures.     

2008年中国电解金属锰发展态势浅析

对中国电解金属锰发展的市场态势、价格行情以及原材料供应情况作了初步分析,提出我国电解金属锰行业挑战与机遇并存,只要抓住机遇、迎接挑战、夯实基础、科技创新,电解金属锰行业前景将会更加光明。     

Replication of dimensions of locus of control.

Employed 120 male and 113 female undergraduates in a replication of H. L. Mirels's (see record 1970-10386-001) study which found 2 factors in analyzing responses to 23 items on Rotter's Internal-External Control Scale. The same polar dimensions of "luck" as the arbiter of life events as opposed to personal control were found as well as a 2nd dimension of degree of control over political and social institutions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Rehabilitation of disorders of the breaking of voice

The adolescent's breaking of the voice is the result of the substitution of the chest voice (or heavy mechanism) for the head voice (or light mechanism). In cases of late breaking, the voice is abnormally high-pitched and feeble, often with a distorted timbre, while the larynx is normal and pubescent. Such people are generally not fully aware of their voices' real nature. Therapy classically resorts to laryngeal manipulations, of which a new technique is put forward. Another therapeutic approach is based, on the one hand, on critical listening compared with a control male voice, thus enabling the subject to become aware of his own voice, and, on the other hand, on high intensity work which helps passing from head to chest voice.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)