摘要:

A model for the longitudinal-flow, vibrating fluid-bed dryer is described. Tests were performed with four different materials in a pilot-scale dryer of length 2.1 m. The model is based on sorption equilibria, drying kinetics and solids transport data. The assumption of equilibrium between the solids and the air is shown to hold for the fine particulate solids, i.e. sand, pentaerythri

ISSN:0737-3937    

DOI:10.1080/07373938708916546

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The drying characteristics of shredded coconut under vacuum and at atmospheric pressure have been studied. It was found that a decrease in the absolute pressure within the drying compartment retarded the drying rate of coconut. A model for drying of coconut is proposed on the assumption that the surface of coconut is partially covered with layers of moisture and oil. It was found that oil seepage to surface was responsible for lower drying rates at low absolute vacuum pressures within the dryer.

ISSN:0737-3937    

DOI:10.1080/07373938708916547

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The variation of moisture content of paddy is experimentally studied in a column dryer. It is seen that the drying of the paddy in bulk in such a dryer can be represented by the drying of a single spherical particle.

ISSN:0737-3937    

DOI:10.1080/07373938708916548

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A thin layer experimental method is presented for the investigation of the effect of compression and drying on bulk density and air flow resistance. A thin layer was subjected to a compressive load and ventilated with drying air to simulate the conditions within a deep bed. The technique is analogous to thin layer drying work and in the same way produces thin layer equations which can be incorporated in deep bed simulation programs. It was found that for a bed of germinated barley (malt) the volume change could be considered in terms of three components: initial compaction, transient settling and drying shrinkage. These were correlated with bed pressure, time and moisture content reduction. The effect of initial compression and settling was shown to produce bulk density variations of the order 20% in 1.5 metre beds. Drying shrinkage was found to produce a height reduction of the order 15%. The pressure gradient due to air flow resistance was increased by as much as a factor of six as a result of compression. Moisture content did not have a great effect on air flow resistance.

ISSN:0737-3937    

DOI:10.1080/07373938708916549

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In order to reduce superfluous energy consumption, the dryer section of an open paper machine was investigated experimentally. The recorded data covered the energy - and mass balances of both the individual drums and the whole dryer section, the state characteristics of the dryer air and some characteristics of the product. In the constant rate period of evaporation the specific heat consumption shows the minimum between 100 1050C dryer surface temperature while the specific evaporation performance is in direct proportion to it. The extent of the increase in energy consumption and of the decrease in evaporation performance below the critical value of moisture content is also demonstrated. Additional possibilities of energy saving exist mainly in aeration and in the more efficient operation of the presses. Some of the results are the characteristics of the investigated machine. It is believed, however, that the results referring to the effect of dryer surface temperature and moisture content are of a general validity and can be applied to other systems as well.

ISSN:0737-3937    

DOI:10.1080/07373938708916550

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

This paper summarizes the developments in the field of drying within the Federal Republic of Germany. The main areas on the scientific side (software) as well as those on the manufacturing'side (hardware) are discussed. This survey covers the period, 1976-1986.

ISSN:0737-3937    

DOI:10.1080/07373938708916551

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A simple mathematical model is presented for electroosmotic dewatering of colloidal suspensions. Comparison with availableliterature data for dewatering under a constant voltage supports validity of the model.

ISSN:0737-3937    

DOI:10.1080/07373938708916552

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938708916553

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938708916554

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0737-3937    

DOI:10.1080/07373938708916555

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor