Sludge drying method and installation
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorGeert Haarlemmer
Life of this patent
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Abstract
This sludge drying device is characterised in that a gas entraining a mix of sludge and sand is recycled after drying (6) and separation (8) to be compressed (10) and circulate again through the dryer (6) acting as a heat exchange fluid. Compression has been performed to increase the dew point temperature of the gas containing the evaporated moisture, such that the latent heat of evaporation can be recovered by the drying gas. The required operating power can then be much lower than the required power for evaporating the moisture contained in the sludge, because most of this power is recovered.
Claims13
Continuous sludge drying method, comprising a mix of a sludge with a divided solid material in a gas flow, sufficient heating of the mix to dry the sludge by evaporating a moisture contained in the sludge into the gas, thus drying the sludge and wetting the gas, and then a separation of the dried sludge from the wet gas and the divided solid material, wherein the wet gas is compressed resulting in an increase in temperature and is then used to heat a next portion of the mix by condensation of the moisture contained in said wet gas;
- and the mix is driven in a form of a spray by the gas flow during the drying of the sludge at a velocity of 20 to 30 meters per second (m/s), and the mix follows a divided flow through a plurality of blower ducts that pass through a dryer.
Sludge drying installation, comprising a mix of a wet sludge and a divided solid material, a mixer comprising an outlet, a gas flow injector, a sludge dryer, a separator of a dried sludge, the divided solid material, and a gas that has become wet, a means of transporting the mix between the mixer and the separator through the sludge dryer, wherein the installation comprises a duct connecting the separator to the sludge dryer which is followed by the gas that has become wet, a compressor being present between the separator and the sludge dryer, the sludge dryer comprising a heat exchanger between the wet gas and the mix, wherein the gas flow injector drives the wet sludge and the divided solid material in the form of a spray at a velocity of 20 to 30 meters per second (m/s), and the mix transport means comprises a plurality of blower ducts that pass through the sludge dryer.
Dependencies are inferred from the claim text.