摘要:

AbstractProgress in dust collection by electrostatic precipitators with due attention to adsorption of noxious gases. It is shown on the basis of the present state of the art that the stipulations of the pollution control legislation for large boilers can be met by electrostatic precipitators and that fine dust and heavy metals are collected to a sufficiently high degree. Recent developments are dealt with which bring about a fundamental improvement of the collection in the precipitator. Noxious gases have to be separated together with the dust to an ever‐increasing extent. With dry processes, fluidized beds are arranged upstream of the electrostatic precipitator for the adsorption of, for instance, HCl, HF, and SO2. In these cases the dusts will be highly concentrated and of varying chemical composition. Dry gas cleaning in the expanded, circulating fluidized bed downstream of refuse incineration plants and defluorination of waste gases from aluminium electrolysis are considered as examples. The separation of dust under difficult conditions is then dealt wit

ISSN:0009-286X    

DOI:10.1002/cite.330570602

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractDetermination of mass transfer coefficients on the basis of dissolved‐oxygen measurements. Sources of error in the dynamic and the stationary method for determination of mass transfer coefficients are discussed on the basis of experimental results obtained in bubble columns. In particular, the delayed electrode response, the resistance in the liquid film, bubble contacts of the electrode, and the influence of very small bubbles encountered in viscous media have to be considere

ISSN:0009-286X    

DOI:10.1002/cite.330570603

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractMixing in screw mixers, Part 2: Suspension, de‐agglomeration, and emulsification. This paper explains the physical laws pertaining to the suspension of solids in liquids, to deagglomeration, and to mixing of immiscible liquids; some results from these different fields are also presented. In fibre reinfored plastics the length of the fibres must be great and the distribution of their length must be narrow. The product undergoes little grinding on using mixing with low shear stresses, feeding with fibres that are not too long, and adding the fibres to the melt. Pigments and some other additional materials tend to agglomerate. De‐agglomeration is necessary to improve the products. It is determined by the adhesion and the force number, which is the product of velocity and time of shearing. Taking suitable action will ensure minimized abrasion in case of abrasive material. A size distribution of droplets will be found if there is only a limited miscibility of liquids. Only size reduction will improve the homogeneity. The velocity of shearing, the interfacial tension, and the ratio of the viscosity of the components, all play a role in this proc

ISSN:0009-286X    

DOI:10.1002/cite.330570604

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

摘要:

AbstractExperiments in process development. Design data for the improvement of existing plants or for the development of new chemical processes are determined by experiments in laboratories or pilot plants. These frequently expensive testruns should lower the scaling‐up risk for industrial plant and should ensure its long‐term functioning and its economy. The various methods of scaling‐up and the influence of errors are discussed. Some examples will show how an exact planning of the experiments can minimize the costs of development and pr

ISSN:0009-286X    

DOI:10.1002/cite.330570605

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330570607

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330570608

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330570609

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330570610

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330570611

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY

ISSN:0009-286X    

DOI:10.1002/cite.330570612

出版商:WILEY‐VCH Verlag    

年代:1985

数据来源: WILEY