Sugar industry

For Clear Juice Heating

The heat transfer performance of the heated juice by the plate heat exchanger is more than double that of the tubular type, so that the heat transfer area used can be reduced by half or more. Here, it is better to use the first effect juice, and there is a certain energy saving effect compared with heating using waste steam.

In the case that the heat exchanger has good performance and is close to the evaporation can, the juice is heated by the juice vapor to make the temperature of the juice close to the juice vapor temperature, only 3 to 5°C lower, which can basically meet the needs of evaporation. Heating with juice vapor can also prevent the coking of sugar juice caused by excessive steam temperature. Some sugar factories in China use waste steam. Some factories have been seriously coked due to careless operation, and the char is difficult to remove.

For Molasses Cooling

The cooling of molasses before entering the storage tank is a key measure to prevent deterioration of the molasses during storage. However, the viscosity of molasses is large, heat transfer is difficult, and the use of a general heat exchanger is not effective.

The use of plate heat exchangers in South Africa and Australia to test the cooling of molasses is better. Both the Gladhow Sugar Mill and the Sezela Sugar Mill in South Africa use plate heat exchangers to cool the molasses. Molasses flow in a single pass in the device, and the cooling water passes in five passes. They used a plate size of 1556 × 416 mm, the number of plates was 96 and 160, respectively, the heat transfer area was 50 and 83 m2, the processed molasses amount was 11.5 and 12.6 t / h, respectively, and the molasses hammer was about 81.

The temperature of the molasses is cooled from 59.8°C to 42.8°C, the latter is cooled from 62.1°C to 36.7°C, the inlet and outlet temperatures of the cooling water are 30.2 and 36.3°C, the latter is 23.3 and 46°C, and the cooling water consumption is 13.8. And 6.1t/h; the heat transfer coefficients are 96.3 and 112W/m2.K, respectively. The heat exchanger needs to be washed once a month with water.