In alumina production, the problems of persistently high steam consumption and continuous cost increases have long been a persistent headache for the alumina industry. Today, however, the 8-Effect Evaporator independently developed by Jiuye Chemical — the world’s only patented product with this technology — provides enterprises with a strong solution to address this dilemma, thanks to its outstanding performance.

The reason why the 8-Effect Evaporator can achieve significant energy conservation and consumption reduction lies mainly in the following aspects:

Increased Number of Effects: Compared with evaporators with fewer effects, the 8-Effect Evaporator has an increased number of effects, which means it can make more efficient use of the secondary steam generated by each effect. Each effect of the evaporator can use the secondary steam from the previous effect as a heat source, greatly reducing the demand for fresh heating steam and thus lowering steam consumption.

Optimized Temperature Difference Distribution: Through precise design, the total temperature difference is reasonably distributed among the eight effects. This ensures each effect can conduct evaporation operations under an appropriate temperature difference, avoiding energy waste caused by unreasonable temperature difference distribution and thus improving energy utilization efficiency.

Precise Heat Balance Calculation: Through precise and scientific heat balance calculations, Jiuye Chemical ensures that the energy input and output of the entire evaporation system achieve balance during operation. This avoids excess or insufficiency of energy, thus ensuring the system operates in an efficient and stable state and reducing unnecessary energy loss.

Solid Technical Support, Stable Operation Without Concerns

In terms of technical feasibility, the 8-Effect Evaporator delivers solid performance. Professional heat balance calculations show that the temperature difference of the 8-Effect Evaporator under low-concentration operating conditions is comparable to that of the 7-Effect Evaporator under high-concentration operating conditions. This means there is no risk of insufficient thermal power — the low-concentration 8-Effect Evaporator unit is fully capable of achieving stable operation, thereby providing a reliable guarantee for enterprises' stable production.

Behind all these outstanding performances lies the strong technical support of Jiuye Chemical. Precise and scientific heat balance calculations and the reasonable distribution of each effect's area are the key technologies for the low-concentration 8-Effect Evaporator unit, and Jiuye Chemical has rich experience in calculation and design in this regard. More importantly, this 8-Effect Evaporator is an independently developed patented technology of Jiuye Chemical, and it is currently the only one of its kind in the world. It is precisely by virtue of this unique and profound technical accumulation that the performance of the 8-Effect Evaporator can be fully exerted.

Remarkable Energy-Saving Economic Benefits

Looking at its energy-saving and economic benefits, it is even more impressive. Heat balance calculations show that compared with the 7-Effect Evaporator Unit, the 8-Effect Evaporator Unit can reduce the steam-water ratio by approximately 0.03. Take an alumina plant with an annual output of 2 million tons as an example: equipped with 2 sets of 450t/h evaporators, it can save about 227,000 tons of steam annually. Based on the domestic steam price of RMB 100 per ton, the annual steam cost savings amount to RMB 22.7 million!

Notably, in Indonesia, since coal prices are comparable to those in China, it is estimated that steam prices will also be roughly similar. Therefore, two sets of 450t/h 8-Effect Evaporators can also help enterprises save RMB 22.7 million in steam costs annually.

When considering the situation in Guinea, the annual cost savings are even greater. As is widely known, Guinea is a well-known energy-scarce region — steam is entirely produced using imported liquefied natural gas (LNG) or heavy oil, pushing its cost to over RMB 300 per ton. Taking an alumina plant with an annual output of 1.2 million tons as an example: if calculated based on a steam price of RMB 300 per ton, the annual steam cost savings are as high as RMB 45 million.

By virtue of its strong technical capabilities, Jiuye Chemical has independently developed the world's only patented 8-Effect Evaporator technology and created such a highly efficient and energy-saving piece of equipment. This not only brings tangible cost savings to enterprises but also takes a solid step forward in promoting the green and low-carbon development of the alumina sector.