STEAM DRYING OF BEET PULP

Información del proyecto

Identificador del acuerdo de subvención: EE.-00081-83

Proyecto cerrado

Fecha de inicio 1 Julio 1983

Fecha de finalización 30 Abril 1986

Financiado con arreglo a

• Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985

Coste total

€ 1 573 623,00

Aportación de la UE

€ 472 087,00

Coordinado por

AKTIESELSKABET DE DANSKE SUKKERFABRIKKER
Denmark

Objetivo

To evaluate a new drying process for beet pulp using a fluidized - bed under pressure, for the production of fodder pills. Energy savings were estimated at 75% of the dryer's actual consumption.
The experimental plant demonstrated good drying capacity, increasing to an evaporation of water at more than 1 T/h, and the dry content of produced pulp exceeded 90%.
The results achieved met the expectations for the basic principle of the drying plant and the constructional working out. As the plant has only very few mechanically movable parts it can be expected that the plant will only result in limited costs of maintenance.
The drier has been made in such a way that minor particles that dry very fast have a shorter stay than larger particles. The stay will only last for 4-6 min. As no oxygen is present during the drying it is possible to have a light product with a pleasant look. The drying process does not cause any admission of heavy metals or unburnt hydrocarbons to the dried material unlike the conventional drum-driers.
As the steam from the pulp can be utilized there is no impact on the external environment unlike the drum driers with chimney for steam with dust.
On the basis of successful tests a larger plant capable of coping with 6 T/h has been constructed.
The pressure-drying plant was started on October 7, and the last day of production was December 22. During this period approrox. 300 tons of dried pulp with approx. 90-94% dry substance were produced. When the plant was operating, approx. 360-390 kg dried material per hour were produced.
The achieved product quality is better than the one from the traditional drying plant, because no soot particles (oil and coal-burning drying plants) or heavy metals are deposited on the dried material.
Owing to the working out of the plant, no discharge of dust particles will take place from the plant into the atmosphere.
The dust produced during the drying is mixed partly with the product and partly with the condensate. When the plant is placed in a sugar factory, this dust will be led back into the process. On the contrary the plant could not come up to expectations for the desired energy saving.
An experimental cellular Fluidised Bed replaces the rotary drum dryer and the exhaust fluid at higher temperature, pressure and calorific content may be reused.
Superheated steam produced by passing through a heat exchanger provided with high pressure steam flows through the fluidised bed, and the low pressure steam leaving the plant may be reused in the factory rather than oil.
In addition to the energy saving the method will reduce the impact on the environment, and in comparison with other traditional methods of drying the product quality will be improved.
Superheated steam enters at the bottom of the dryer and passes through a perforated plate to that part of the dryer where the drying of the beet pulp takes place. The dryer is divided into 16 cells by means of vertical plates which radiate from the centre pipe. The material is led into cell 1 and has to move through the cells to cell 16. Here it falls into a screw conveyor which carries it to a rotary valve. In the cells, thesteam coming from below will lift the particles and set them moving. The passage from cell to cell takes place mainly through holes in the cell walls just above the perforated plate. The placing and size of these were adjusted at the beginning of the operation in order to achieve the right filling of all cells.

Ámbito científico (EuroSciVoc)

Este proyecto aún no se ha clasificado con EuroSciVoc.
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Programa(s)

• ENG-ENALT 2C - Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985

Tema(s)

• 3.2 - INDUSTRY

Convocatoria de propuestas

Datos no disponibles

Régimen de financiación

DEM - Demonstration contracts

Coordinador

AKTIESELSKABET DE DANSKE SUKKERFABRIKKER

• Aportación de la UE: Sin datos
• Dirección: MARIBOVEJ 2 BP 119 ; 4900 NAKSKOV ; Dinamarca
• Coste total: Sin datos