350MW机组给水泵汽轮机供汽中断的分析与处理

在火力发电厂运行过程中,一个非常重要的设备就是汽动给水泵,为了保证整个火电厂机组的安全稳定运行,就需要汽动给水泵不断的向锅炉供给充足温度、流量与压强的水,因此,一旦汽动给水泵组在运行过程中出现故障退出运行,将会对整个火力发电厂的正常运行产生严重影响。本文就主要对给水泵汽轮机汽源中断导致汽泵退出运行的原因进行排查分析,并结合机组检修彻底处理。     

锅炉高压给水泵平衡环磨损问题分析及改进

1前言新疆八一钢铁集团有限责任公司热电联产一期工程,规模为2×130t煤和高炉煤气混烧锅炉,及2×25MW抽汽凝汽供热机组。本工程主要解决八钢地区供热热源及现有低热值二次能源利用问题,完全遵循了以“热定电、热电联产、能源综合利用、保护环境”的原则,该工程被批准为国家重点技术改造,“双高一优”项目,自2002年8月23日开工到2003年10月01日,1#炉正式点火,进入调试阶段,但锅炉的高压给水泵不能正常工作,影响到锅炉的安全连续运行。2设备状况及问题在热电工程调试阶段中,3台DG150-89型的给水泵运行不到72h,给水泵的平衡环磨损严重,轴承座…     

350MW机组汽动给水泵出力不足的分析与处理

大型火电机组高压给水系统的稳定运行,关系到发电机组的安全运行与经济性。汽动给水泵提供火电机组锅炉的水源介质,是高压给水系统的重要组成部分。对某350 MW机组高压给水泵出力不足的问题进行研究分析,并提出相关处理方法。     

350 MW机组深调期间协调控制策略优化研究与应用

甘肃电投武威热电有限责任公司1#、2#机组为抽汽供热机组,由于机组在不同工况下主汽压力、主汽温度的波动会对机组安全性、经济性造成不利影响。尤其在AGC方式下,机组滑压曲线设定不合理,会导致机组稳定性与经济性降低,不能满足电网一次调频、AGC及其相关辅助逻辑调度系统《两个细则》的考核要求。通过对机组协调参数进行全面优化,优化后机组各项运行参数满足现场实际需要,不仅提高了机组AGC的响应速率、一次调频响应速率,而且有效的提高了机组的安全性、经济性,对350 MW供热机组协调、深调控制有一定的借鉴意义。     

汽动给水泵在热电企业的应用

利用部分外供低压蒸汽做汽源,驱动小型工业汽轮机替代高压电动机拖动锅炉给水泵,提高锅炉运行的安全性,降低厂用电量,减少除氧器加热用的较高品质的蒸汽量,实现低压蒸汽的梯级合理利用,提高热电厂运行的经济性。     

十五冶三公司承建的一项目汽动给水泵组安装完成

<正>由十五冶三公司承建的内蒙古宏大兴和2×350MW热电联产机组项目汽动给水泵组安装完成。汽动给水泵组主要是由小汽机、主泵、前置泵组成,可以俗称为"小汽机"或"小机",其工作目的主要是给锅炉提供除盐水、为锅炉提供给水量为不低于30%的流量及设计扬程量。汽动给水泵组的安装为汽机大扣盖前奠定了基础。据了解,该公司施工的2#机     

给水泵出口管路压力及汽包进水流量控制优化实践

加热炉汽化系统汽包进水流量调节阀开度按照控制程序设定的汽包水位目标值进行自动调节.在调节过程中,给水泵出口管路压力及汽包进水流量产生波动.通过分析给水泵出口管路压力及汽包进水流量波动的原因,制定并实施相应的系统控制优化措施,稳定了给水泵出口管路压力,降低了汽包进水流量波动幅度,保证给水泵始终处在最佳工作状态.     

350 MW机组深调期间利用中调门调整工业抽汽试验与应用

介绍了甘肃电投武威热电公司东汽350 MW机组,在深调期间利用中压调门,调整工业抽汽试验与应用情况,分析了机组深调供汽情况下运行的经济性,以及关小中调门开度对冷再压力、工业供汽流量及机组安全性影响。     

给水泵过流跳闸事故分析

主要针对给水泵电机在负荷突变,变频器自动由变频运行切换到工频运行时,上级断路器过流跳闸的问题进行原因分析,并根据分析的原因进行了改造,提高了给水泵电机的运行可靠性。     

300 MW机组抽汽余热带发电项目研究与探讨

大型钢铁公司内部蒸汽余能、余热可利用空间较大,公司自备300 MW发电机组三段抽汽经减温减压后送至蒸汽管网,具有一定的能源损失及季节性波动,根据机组抽汽能力增设发电机组,使蒸汽能源二次分配、利用,有效回收余能,发电创效。     

论从实践理解世界的物质性和自然世界的先在性

马克思主义唯物论是一种物本主义形态的唯物论,还是一种超越物本主义形态、从实践理解世界的本质相关问题的实践的唯物主义的唯物论?这是一个我们必须搞清楚的有关马克思主义唯物论的本质规定性和精神实质的重大问题.在考察物本主义的唯物论及其思维方式的局限性的基础上,揭示了马克思主义唯物论是现代的、实践的唯物主义,并重点研讨了马克思主义唯物论关于从实践理解世界的物质性和自然世界的先在性的原理,以期为马克思主义唯物论进一步阐明人类世界的实践性原理奠定基础.     

Effect of cyproheptadine on the ultrastructure of the neurons of the arcuate nucleus in the hypothalamus of the rat

The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease.     

Characteristics of the sympathetic innervation of the nictitating membrane and of the vasculature of the nose and tongue of the cat

Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions.     

Structure of the attachment of the vocal ligament to the perichondrium of the thyroid cartilage

The ventral attachement of the ligamentum vocale of eleven larynges (new-born and adults has been studied in sagittal, frontal and horizontal sections. 1. Supplementary to the known structure of the ventral attachement of the ligamentum vocale we have noticed collagen fibers which ascend in the inner angle of the thyroid cartilage and which partly cross to the other side. Sometimes a few fibers which are running downward have been observed. This structure of the attachement must be more firm than the known structure. 2. Moreover it has been observed that a lot of the angles of the crossing collagen fibers in the cartilage of the lamina mediana (near the attachement of the ligamentum vocale) are right-angled, whereas the angles of the fibers which lie in the laminae laterales in their majority are acute-angled. This phenomenon also is interpreted as a structure which makes the lamina mediana firmer. The fact, that this structure is not so evident in the specimens of the new-born as in those of the adults indicates that there are postnatal changes in the structure of the lamina mediana.