豐里 Above: Batch evaporator plant Niro Drver There were two of these dryers in parallel in this particular plant, and the Niro dryer is specially designed to cope with the properties of tomato powder, with a drying chamber of non standard construction as compared with other types of spray dryer. The conventional chamber design would create problems on account of the thermoplastic and hygroscopic properties of the powder, and continuous drying would be difficult. The co-curren drying chamber(30) has a jacketed wall for air cooling and a conical base. Ambientairis drawn through the jacket prior tentering thechamber via the air heater (28). Cooling air intake is controlled to enable close maintenance of a wall temperature which, in the range of 38"-50C, allows continuous operation. Paste is pumped to a rotating vaned -disc atomiser(23)located within the air disperser (29). The vaned disc has multi-vanes to achieve complete atomisation of the heavy paste feed. Paste is sprayed into the drying air entering the chamber at a temperature of 138-150"C The drying air to theAbove: Batch evaporator plant Niro Dryer There were two of these dryers in parallel in this particular plant, and the Niro dryer is specially designed to cope with the properties of tomato powder, with a drying chamber of non standard construction as compared with other types of spray dryer. The conventional chamber design would create problems on account of the thermoplastic and hygroscopic properties of the powder, and continuous drying would be difficult. The co-current drying chamber (30) has a jacketed wall for air cooling and a conical base. Ambientair isdrawn through the jacket prior toentering thechamber via the air heater (28). Cooling air intake is controlled to enable close maintenance of a wall temperature which, in the range of 38'- 50°C, allows continuous operation. Paste is pumped to a rotating vaned-disc atomiser (23) located within the air disperser (29). The vaned disc has multi-vanes to achieve complete atomisation of the heavy paste feed. Paste is sprayed into the drying air entering the chamber at a temperature of 138'- 150°C. The drying air to the 195