The scale of the evaporation cans and heaters of the sugar factory is really amazing, and the damage is also very large. Many sugar factories have to wash one evaporation tank and one heater every day, some even more; some sugar mills have to be washed frequently. These jobs are labor intensive and descaling using high pressure water with pressures up to hundreds of atmospheres is also a dangerous job. A large sugar factory spends hundreds of thousands of dollars per year on the cost of fouling (including chemicals).
The more important problem is that a large amount of fouling significantly reduces the heat transfer performance of the equipment, so the sugar mill needs to use more equipment and consume more steam, which increases the investment cost and production cost of the equipment. Now, the average evaporation intensity of the evaporation cans of many sugar factories (the amount of water evaporated per hour of heating area per square meter) is only about 20kg (or below), and in the early 1950s, Guangdong Shunde, Dongguan, Ziwei, Jieyang and other sugar The factory, this value is between 30 ~ 33kg, which is now about 1/3 lower than at that time. On the other hand, due to poor heat transfer performance, the evaporation can uses higher vapor pressure and consumes more steam. This value is generally estimated to be 3 to 5% in foreign countries (the domestic sugar factory has more fouling and this value will be larger). Some sugar factories are forced to reduce the amount of crushing even because of the serious scale, and the loss is great.
Decades of production practice reflect two main laws:
1. The lime sugar factory has less fouling and is easier to wash. The sulphurous acid method has more and more solid scale.
2, the sulfuric acid process sugar plant with the increase in sulfur cane juice, the amount of fouling increased significantly, and more difficult to remove. The domestic sulphuric acid sugar plant has an early sulfur content of only 0.05-0.06%, but it is now generally increased to 0.10-0.12%, which is about doubled. Although high-sulfur smoke can produce white sugar, the water pressure required for descaling with high-pressure water is increased from about 300 at the beginning to 800-1000 at the present level!
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