China Aluminium Shanxi Branch High-pressure Dissolution Single-tube Reform Reduced Gas Consumption

According to the bulk non-ferrous net reprint: Recently, China Aluminum Corporation Shanxi Branch high-pressure dissolution system energy-saving transformation "new two-stage single casing preheater" project put into operation. The inspection data show that the average fuel consumption per hour after the project is put into operation is about 6 tons. Compared with the average steam consumption in the first half of the year, this project has already reduced the cost of more than 300,000 yuan since August.

The high pressure dissolution system is the core process of the alumina Bayer process production system. It plays an important role in dissolving the original pulp in the high temperature and high pressure conditions and is a major steam consumer. In order to further save energy and reduce consumption, the company's first alumina plant incorporates the production practice of the innovative tandem method, systematically optimizes the weak links in the process, and gives full play to the capabilities of existing facilities in order to realize energy saving, reduce raw material consumption and energy consumption. .

It is understood that the “new two-stage single-sleeved preheater” project will be upgraded by adding two single-stage pipes at the original five-level single pipe to achieve better flash evaporation effect and effectively increase the preheating temperature of the original slurry. To achieve the same amount of steam, the purpose of heating more slurry.

During the renovation, the project implementers restored the slurry flash evaporator isotope level monitoring device to improve the automation level; updated the top of the lack of steam pipeline electric regulating valve, stabilized the flasher liquid level, improve the dissolution system waste heat utilization level. At the same time, the non-condensable gas discharge process of the pre-heated and pressured boiler is resumed, the non-condensable gas is eliminated, and the heat transfer effect is improved; the self-balanced pressure trap is used to optimize the hydrophobic system, and the high temperature condensate is used to transport the evaporative preheated liquid. Use system heat.

After the new project was put into use, the single-tube outlet temperature increased by 15 degrees Celsius, the warm-up section had an overall temperature increase of about 5 degrees Celsius, and the final pressure was significantly reduced. The dilution tank and hot water tank drastically reduced the amount of steam and the working environment was significantly improved.