| Case Introduction:
Lansing Silicon Materials Co.,Ltd attached to China National Bluestar (Group),is the largest base specialized in the silicon industry research, production and sales.It lies in Zhong bao town,Lanzhou City,Gansu Province and covers an area of 200,000 square meters.The company owns 2 industrial silicon furnace,one is the 10000 KVA electric furnace reconstructed by the company,the other is introduced from German Maga company which is the the 25 000 KVA electric furnace.The annual production capacity is 20,000 tons,which is the largest industrial silicon furnace in Asia.
Project introduction:
When Lansing Silicon Materials Co.,Ltd’s # 1 silicon furnace industrial operates,smoke temperature at the end of furnace is 550 ℃,the flow is 140,000 Nm3/H,equivalent to the status is about 28-30 million Nm3/H.The smoke is transferred through a Ф2820 mm , δ = 8 mm,length 30-meter pipe to collecting devices.Heat pipe surface temperature is 200-230 ℃.Heat distributes to the surrounding through the pipe wall which causes a big waste of heat and also high temperature pollution to the environment.
On the other hand,industrial silicon furnace requires a large amount of charcoal.About 80 tons of charcoal are used daily for 1#,3#furnace.Since the uneven quality of the procurement charcoal,the moisture is from 25% to 50%.Charcoal which contains more than 30% moisture and which is instable will cause imbalance of carbon ingredients in the electric furnace and increase power consumption. In addition, because of the exceeded moisture,charcoal water gas reaction will happen in the initial stage when charcoal is put into the furnace,which will increase the surface temperature.Instability of Charcoal moisture will not only increases the energy consumption of silicon furnace，but also be bad to the operation of production technology and the operating environment.At present approaches to solve the problem of exceeded moistur are mainly by artificial natural drying that is the popular saying "by heaven",which not only increases the numbers of charcoal transportation and amount of damage,but also causes different moistures in natural drying.
The project is to recycle the 200-230 ℃ heat of 30 m pipe surface to dry the charcoal.After the implementation of the project,the problem of exceeded moisture is solved and energy is saved,which kills two birds with one stone.
Economic benefits:
after reconstructed by为Xiamen gaopu science Technology Co.,Ltd,200-230 ℃ heat on pipe surface is recycled in industrial furnace exhaust,and the recycling heat is 77 × 105KJ/H = 1840300kcal/h,which drys the charcoal with the air temperature above 150 ℃,equivalent to save nearly 10 tons of coal per day.
Social benefits:
after reconstruction,pipe surface heat is fully recycled in industrial furnace exhaust,which greatly reduces the high temperature pollution emissions.
Before reconstruction :
Reconstruction:
After reconstruction:
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