Abstract: A process of waste incineration, with heat recovery and reduced emissions of acid gases and particulate comprising a reduction of acid gases and particulate by mixing recirculating low temperature flue gases flowing out from the heat recovery section, with high temperature flue gases obtained from incineration. Said mixed flue gases are subjected, prior to heat recovery, to particulate separation. Moreover, the low temperature flue gases may be deacidified. Preferably, the reduction is enhanced by reacting the high temperature flue gases, mixed with a cold flue gas recirculation stream drawn downstream the heat recovery section, with an alkaline reagent, in order to eliminate the acidic gases. A waste incinerator is disclosed, which is combined with an acid gases and particulate removal plant, which is provided between the incinerator itself (2, 6) and the boiler (7).

Abstract: Saline water is desalted by flowing it in two evaporation stages in series in the form of a film falling on the inside of heat-exchange tubes. The pressure and temperature in the second evaporation stage are lower than in the first stage. The steam evolved in the second stage is compressed and delivered to the first stage where it condenses on the tubes, whereas the steam evolved in the first stage is fed in the second stage where it condenses on the tubes. The condensation heat of the steam is used for vaporizing said saline water from said film. This technique allows a production of 15-50 cu.m/hr of soft water, instead of a production of 15-20 cu.m/hr usually obtained by conventional thermocompression techniques.

Abstract: A multistage flash-evaporator for producing soft water from a saline water, comprising a shell forming a pair of lobes enclosing therebetween a spinal portion in symmetrical arrangement with respect to a vertical longitudinal mid-plane. The top and bottom walls of the spinal portion are, in cross-sectional shape, circular arcs having their centres of curvature on the said mid-plane, while the lobes are polycentric curves each of which has its centres of curvature on a plane parallel to the mid-plane. A specifically shaped hood arrangement in the shell is provided to define in each stage a condensation chamber centrally located between a pair of evaporation chambers.