摘要:

AbstractDynamics and stability of chemical engineering processes.Peculiarities of dynamic behaviour as well as stability phenomena in the field of chemical engineering are reviewed with emphasis on the stability of single evaporator tubes and on the stability and dynamics of chemical reactors with strongly exothermic reactions. It is shown that the basic behaviour can be explained in both cases by fairly simple considerations. Some new aspects of general stability theory are also discussed briefly.

ISSN:0009-286X    

DOI:10.1002/cite.330550702

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330550704

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractChemical reaction engineering of anaerobic fermentation.Anaerobic fermentation has already been used for more than 50 years for the disposal of excess activated sludge. In recent years, increasing costs and considerable problems encountered in connection with the disposal of activated sludge have encouraged the development of anaerobic processes for the treatment of industrial waste water. Various aspects which have to be taken into account when planning a digester plant are discussed. Reduction in residence time with concomitant increase of biogas production rate is possible by retention of biomass. In this way catabolic performances are obtained comparable to those of aerobic high capacity activated sludge plants. Anaerobic waste treatment appears so far to be a real purification method because the predominant part of the organic pollution (more than 95%) is eliminated under energy saving conditions. The by‐product biogas contributes to the energy self‐sufficiency of the proc

ISSN:0009-286X    

DOI:10.1002/cite.330550705

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractAdvances in the design of pneumatic conveyors.Pneumatic conveyors can be constructed for a variety of flow conditions, such as, e. g. dilute phase conveying, strand conveying or plug‐flow conveying. The choice of the most favourable flow condition is naturally determined by the particular problem at hand, and, in particular by the physical data of the solid to be conveyed. In practice, when designing such conveyors, not only the processes taking place in the pipeline have to be taken into account but also those taking place during the feeding and separating of the solid, since these jointly influence the flow conditions of the whole system. The choice of fan is of considerable importance. The accuracy of the precalculation of pressure drops and the criteria for the choice of the most favourable gas velocity in the conveyor line are still unsatisfactory, in spite of the many previously confirmed findings. More recent investigations on the prediction of various flow conditions and on plug‐flow conveying enable a better choice of the most favourable method of conveying. Significant technical developments have been made, especially as regards calculated plug‐flow conv

ISSN:0009-286X    

DOI:10.1002/cite.330550706

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330550707

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

摘要:

AbstractTemporary corrosion protection for plant construction equipment outside of Central Europe.„Temporary protection against corrosion”︁ consists of measures for the prevention of damage to equipment by corrosion within a given limited period of time. Essentially, it consists in the protection of machinery, apparatus, fittings, pipelines, measuring and control equipment etc. against atmospheric corrosion in the time between the fabrication of such equipment by the manufacturer and its assembly or commissioning by the firm who is to run the plant. A guaranteed protection against corrosion for a period of two years and more is not unusual. Apart from corrosion, the equipment is also subject to mechanical wear and tear. Worth mentioning here are wear and tear due to, inter alia: buffering during transport by rail; rolling during transport by ship; bending and knocking during loading and unloading; compression during stacking in ships holds and in wharehouses; vibration during transportation. These, in part, quite considerable mechanical stresses which the equipment is subjected to should be taken into account, on the one hand when constructing and installing the equipment, and, on the other, when protecting the equipment against corrosion and when pa

ISSN:0009-286X    

DOI:10.1002/cite.330550708

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330550709

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330550710

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330550711

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330550712

出版商:WILEY‐VCH Verlag    

年代:1983

数据来源: WILEY