For energy conservation, in 2010, the company boiler soot blowing gun to transform and improve the effect of heat transfer, the flue gas heat recovery, heating for pulp. After the transformation, the flue gas temperature is greatly reduced, damage to the subsequent bag filter apparatus is greatly reduced. Without reform, bag filter can only be used one year; after the transformation, bag filter has been used since 2010 for two years and nine months. On March 21, Lin Qing, the assistant general manager of the company, gave the author an account in the heat workshop: “The value of a boiler bag is more than 2 million yuan, and the service life is extended. It saves five or six million yuan in two years. ."
The company has also modified the molten salt furnace and roaster of energy-consuming equipment to recycle waste heat from flue gas. The temperature of the flue gas in the previous melting of the molten salt furnace was 230 degrees, and the temperature dropped to 160 degrees after the transformation. At the same time, the steam production increased from 8 tons per hour to 25 tons per hour.
In the past, the motor speed of the main equipment was constant, but in many cases, the saw blade did not need such a high speed, resulting in wasted power. In order to change this situation, the company installed frequency control devices for main equipment such as semen pumps, mother liquor pumps and circulating water pumps before October 2011. According to the production needs, the motor speed is adjusted reasonably. This technological innovation has brought about 47% of the benefits of saving electricity.
Recently, we are actively exploring and utilizing a scientific research result. The cutting efficiency of the company's saw blade is not high. In August last year, Jiangyin Qiantang Guangzhou Cement Abrasives Co., Ltd. and other companies jointly carried out scientific and technological research, redesigned the hydraulic model of the return pump, improved the cutting efficiency of the saw blade, and saved 40 %. At present, the company's circulating water pump and return water pump are undergoing renovation, and some have been successfully transformed. The author came to the thermal workshop with the company's scientific research personnel. There are two return pumps in the workshop. One sound is loud and one sound is small. "The motor current of this big sound pump has more than 140 amps. We reduced it to more than 80 amps and saved 30 kWh per hour." The engineer responsible for this research introduced it with interest.
In December 2011, the settling overflow pump in the dissolution plant was deactivated. Through the process modification, the slurry is transported to the next process by the pressure generated by the difference. At the workshop site, Li Qigui, manager of the manufacturing department, said: "In the past, there were four pumps with a power of 200 kW. Two of them worked long-term and two were spare. Now there is no electricity, and the electricity cost is 1.7 million yuan a year."
In Zunyi Alumina, there are still many research projects for energy conservation and emission reduction like this. Here, waste gas, waste water and waste slag are all treasures, and the waste gas can utilize the rest of the heat, and the waste water can be reused, and the waste residue can produce building materials.
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