Example 6, sewage disposal and other environmental protection class load

Environmental protection is taken seriously more and more, it is related to human survival environment, even the Olympic bid also have environmental index. Thus the clean energy, green city all appeared. Frequency control of motor speed available in three aspects of environmental protection class load. One is the industrial wastewater treatment, 2 it is garbage power plant, three is industrial smoke and exhaust and dust removal control. Such as guangzhou refinery, convert aeration machine sewage treatment mixing equipment, USES the cage motor frequency control of motor speed, improve product reliability, save electricy more than 40%, while improving the activated sludge microbial group of life, improve the sewage treatment effect.
Be like again foshan garbage power plant in the process selection of 52 table converter. Visible frequency control of motor speed has become the main equipment of environmental protection. China petrochemical corporation make a extinguished the torch (mainly refers to rotary joints the big oil refinery to burn gas) plan, that is the combustible gas delivery to use frequency control of motor speed compression machine cabinet recovery. Example 7, music fountain class load Very attract visitors to the music fountain, the water level of the amount and size is by frequency conversion control. Asian spray the highest of heyuan city, guangdong music fountain and scale a lot of shandong jinan quancheng square music fountain all belong to rotary union this, namely, power saving and effect is very good, in construction music fountain, attention should be paid to the harmonic frequency converter to control system of interference.
Example 8, cigarette machine class load Cigarette industry in the past imported cigarette machine, no matter Maureen 8, or Maureen 10, were not stepless speed regulation. Therefore, in the cigarette industry is mainly solve the stepless speed regulation and reliability problems, technology is simple, frequency converter usage simple, convergence greatly. The cigar mill of zhaotong city 19 sets of import grant 4 roll joint packaging integral unit using frequency control of motor speed, increase the cigarette, 200 cases, 200 cases of the cigarette tax quite 19 sets the price of frequency converter, namely one day disinvestment. Therefore, cigarette machine reconstruction rapidly, great benefit. Now most of the domestic machine is equipped with a variable frequency speed regulating function. Case 9, large kiln calcining class load Metallurgy, building materials, caustic soda and other large industrial turn furnace (bof) before most of them adopt dc, commutator machine, slip motor and speed regulating pole string. Because these speed regulating mode or fiber optic rotary joint , or low efficiency, in recent years, a lot of units by ac frequency conversion control, the effect is very good. ZhuZhou smeltery of zinc leaching residue volatilization kiln is the main body of zinc recovery equipment, a total of three table. Kiln outside diameter 2.8 meters, 44 meters long, the original with the positive flow son motor and slip motor drive, fault, often trip, a great quantity of maintenance.
Due to the bad environment, conductive dust, electric spark constantly. Brush, carbon brush change constantly, 90 minor repair 56 times, change only 1670 carbon brush, brush 647 only, serious influence the production. In June 91 the factory finished rotary kiln of frequency control of motor speed transformation. Smooth operation, reliable, simple operation, didn't happen because of motor drive fault and affect production. Annual energy saving 120000 degrees, over production is 1.1782 million yuan. Tangshan factory light grey calcined furnace is the key equipment of soda production, diameter 3.6 meters, furnace body length 30 meters, gross weight 266 tons, with 220 kw converter drive, low frequency start well, rotary stability, high reliability, improve the product quality, so that the calcined furnace production into the advanced ranks.