A kiln tube measuring 60 meters long and 4 meters in diameter was slightly inclined and “horizontal†at an altitude of 7 to 8 meters, rhythmically rotating, giving off a thick sound. The kiln drum is connected with other huge production equipment, and each device is stripped of the dust coat of the past. Ground, clean as living quarters. This is a scene seen by reporters yesterday in Fujian Province, the development of Cement Development Co., Ltd.
“This slightly inclined “lying†kiln tube that can be used as a rotary motion is a rotary kiln. Previously, the kiln tube was upright and could not be turned. It was called a shaft kiln.†Fang Qifu, chief engineer of Mchengcheng Cement, introduced it. The company is located in Kengyuan Village, Caoyuan Town, Yong'an City. After its establishment in 2003, it used shaft kiln production. In May 2007, two rotary kiln cement production lines were put into operation with a total investment of over RMB 500 million.
The difference between a rotary kiln and a vertical kiln is more than just appearance. The rotary kiln is a new type of dry process cement production. It adopts a new process of decomposition outside the cement to produce cement. The whole line adopts computer distributed control to realize the automation of the production process. Compared with shaft kiln, high efficiency, high quality, low consumption and environmental protection are the biggest advantages of rotary kiln. "From raw materials to finished cement products, the entire production line is completely closed." Fang Qifu said, "We have very little dust pollution at the cement plant because dust cannot escape."
The reporter noticed that a hint of light smoke slowly drifted out of the towering chimney and the color was almost transparent. Compared to the rolling smoke produced by the shaft kiln, the rotary kiln has achieved the ultimate in environmental protection. According to a laboratory worker, there is almost no oxidation* in the smoke, and most of the dioxide has been removed after the reaction of the dioxide* with the alkali in the closed production line.
After watching the production line, walk into the control room. Every detail of the production line can be seen on the computer. “In the past, every piece of equipment needed special caretaker. Now it is fully automated. Only 3 people can supervise the entire production line.†Yang Jianming, director of the central control room, said that a shaft kiln production line can produce up to 100,000 tons of cement per year, requiring at least 200 The staff, a rotary kiln production line with an annual output of over 1 million tons, only about 100 workers.
"To produce 1 ton of cement, the shaft kiln needs to consume about 125 kg of standard coal, and the rotary kiln only consumes 104 kg, which can save about 17% of the coal used. Moreover, the rotary kiln can collect waste heat for power generation." Fang Qifu added .
It is reported that the two rotary kiln production lines that were constructed with a cost of more than 500 million yuan will have an annual output of 2.8 million tons of cement and an annual production value of more than 1 billion yuan.
At present, Yongan has 5 rotary kiln cement production enterprises. Since 2007, the city has eliminated 3.237 million tons of backward cement production capacity, basically eliminating the production of shaft kiln. Today, the city's annual cement production capacity is nearly 10 million tons, and the proportion of new dry process cement production is 80%. In the past, the “grey†industry has gradually shifted to “greenâ€.
“This slightly inclined “lying†kiln tube that can be used as a rotary motion is a rotary kiln. Previously, the kiln tube was upright and could not be turned. It was called a shaft kiln.†Fang Qifu, chief engineer of Mchengcheng Cement, introduced it. The company is located in Kengyuan Village, Caoyuan Town, Yong'an City. After its establishment in 2003, it used shaft kiln production. In May 2007, two rotary kiln cement production lines were put into operation with a total investment of over RMB 500 million.
The difference between a rotary kiln and a vertical kiln is more than just appearance. The rotary kiln is a new type of dry process cement production. It adopts a new process of decomposition outside the cement to produce cement. The whole line adopts computer distributed control to realize the automation of the production process. Compared with shaft kiln, high efficiency, high quality, low consumption and environmental protection are the biggest advantages of rotary kiln. "From raw materials to finished cement products, the entire production line is completely closed." Fang Qifu said, "We have very little dust pollution at the cement plant because dust cannot escape."
The reporter noticed that a hint of light smoke slowly drifted out of the towering chimney and the color was almost transparent. Compared to the rolling smoke produced by the shaft kiln, the rotary kiln has achieved the ultimate in environmental protection. According to a laboratory worker, there is almost no oxidation* in the smoke, and most of the dioxide has been removed after the reaction of the dioxide* with the alkali in the closed production line.
After watching the production line, walk into the control room. Every detail of the production line can be seen on the computer. “In the past, every piece of equipment needed special caretaker. Now it is fully automated. Only 3 people can supervise the entire production line.†Yang Jianming, director of the central control room, said that a shaft kiln production line can produce up to 100,000 tons of cement per year, requiring at least 200 The staff, a rotary kiln production line with an annual output of over 1 million tons, only about 100 workers.
"To produce 1 ton of cement, the shaft kiln needs to consume about 125 kg of standard coal, and the rotary kiln only consumes 104 kg, which can save about 17% of the coal used. Moreover, the rotary kiln can collect waste heat for power generation." Fang Qifu added .
It is reported that the two rotary kiln production lines that were constructed with a cost of more than 500 million yuan will have an annual output of 2.8 million tons of cement and an annual production value of more than 1 billion yuan.
At present, Yongan has 5 rotary kiln cement production enterprises. Since 2007, the city has eliminated 3.237 million tons of backward cement production capacity, basically eliminating the production of shaft kiln. Today, the city's annual cement production capacity is nearly 10 million tons, and the proportion of new dry process cement production is 80%. In the past, the “grey†industry has gradually shifted to “greenâ€.
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