石化设备导热油结焦问题及其健康状态维护研究

结焦是导热油相关设备在运行过程中最常遇到的问题,结焦物引起管路堵塞、传热效率下降、管路变形甚至管路爆裂引发起火事故等。以某石化公司的聚丙烯挤压机为例,介绍导热油结焦相关的油品理化指标及结焦物的成分判定,指出聚丙烯挤压机的结焦是由于油膜处温度明显高出监测温度及导热油流速过慢导致的。分析导热油结焦引发的隐患和危害,并阐述导热油及其设备健康状态维护的方法。     

焦化干气加氢热力学研究及其工业应用

计算了焦化干气加氢中各反应的标准摩尔生成焓以及反应温度范围内的吉布斯自由能和平衡常数。结果表明,温度是影响反应热力学的重要因素。此外,为了减少温度对反应平衡的影响,应该采用提高反应压力、降低反应温度的方法使烯烃和氧加氢反应达到一定深度。因此,焦化干气加氢热力学研究对焦化干气加氢技术的工业化应用有重要的指导意义,根据其研究结果选定的工艺条件能够满足工业装置的正常运行及指标要求。     

弱粘结性炼焦煤配比研究与应用

对类气煤、气煤、瘦煤、贫瘦煤等弱粘结性炼焦煤进行煤质分析及配用研究,并在工业生产中得到很好的应用。     

Molecular design of deep blue fluorescent emitters with 20% external quantum efficiency and narrow emission spectrum

A thermally activated delayed fluorescent (TADF) emitter, 2,7-bis(9,9-dimethylacridin-10(9H)-yl)-9,9-dimethyl-9H-thioxanthene 10,10-dioxide (DMTDAc), was developed as a deep blue TADF emitter using a rigid 9,9-dimethyl-9H-thioxanthene 10,10-dioxide (DMTD) acceptor and an acridine donor. The rigid DMTD acceptor narrowed emission spectrum of DMTDAc by interlocking two phenyl units of diphenylsulfone. A deep blue TADF device with an external quantum efficiency close to 20% with a deep blue color coordinate of (0.15,0.13) was provided using the DMTDAc TADF emitter.     

A~2O法处理焦化废水的成本分析和控制

以太原煤气化股份有限公司第二焦化厂为例,综合分析了A2O法处理焦化废水的成本,包括电费、药剂费、资源费等,以2010年实际生产运行数据为基准,经计算可知,每生产1 t焦炭需处理0.58 t焦化废水,水处理的费用为6.5元/t;对A2O法处理焦化废水成本的控制关键是对药剂和用电设备的控制。     

Phenol degradation by isolated bacterial strains: kinetics study and application in coking wastewater treatment

BACKGROUND: In biological treatment of coking wastewater, phenol may decrease the treatment efficiency because of its high concentration and toxicity to microorganisms. Bioaugmentation has been regarded as a good improvement of the traditional biological treatment using isolated degrading strains. In this study, two phenol degrading strains, Pseudomonas sp. PCT01 and PTS02, were isolated and investigated for degradation ability and application to real coking wastewater treatment. RESULTS: Complete phenol degradation was achieved after 18 h inoculation in medium containing 229‐461 mg L^?1 of phenol for both strains. The presence of phenol, pyridine and other compounds in mixed substrate or in coking wastewater prolonged the degradation to 20‐32 h with an initial phenol concentration of 160‐280 mg L^?1. The study of degradation kinetics yielded a two‐stage model to describe the effect of the initial phenol concentration and inhibitory compounds on phenol degradation. The highest degradation rate constant of the second stage, 1.25 h^?1 for PCT01 and 0.75 h^?1 for PTS02, was obtained at low phenol concentration in a single substrate. CONCLUSION: It was found that both strains could degrade phenol effectively and maintain their phenol degradation ability in coking wastewater, and therefore could be used for bioaugmentation treatment of coking wastewater. Copyright © 2011 Society of Chemical Industry     

Stabilization of persistently excited linear systems by delayed feedback laws

This paper considers the stabilization to the origin of a persistently excited linear system by means of a linear state feedback, where we suppose that the feedback law is not applied instantaneously, but after a certain positive delay (not necessarily constant). The main result is that, under certain spectral hypotheses on the linear system, stabilization by means of a linear delayed feedback is indeed possible, generalizing a previous result already known for non-delayed feedback laws.     

配型煤炼焦工艺研究概况

配型煤炼焦是解决我国优质环保炼焦煤紧缺的有效途径。本文综述了配型煤炼焦技术的生产工艺及原理,给出了适合焦化厂技术改造的工艺流程。结合试验研究,考虑到焦炉的寿命和焦炭的质量,确定型煤配比的合理选择范围为15%～30%,并阐述了单种煤配型煤炼焦的效果。     

Pyragas stabilizability via delayed feedback with periodic control gain

In this paper for the unstable periodic solution of nonlinear differential equation, Pyragas stabilizability problem is studied. An algorithm of stabilization via periodical delayed feedback is obtained. The consideration is based on the theory of nonstationary stabilization.