Cement plant for large industrial fans

Cement production enterprises of the national economy in the production of energy guzzler, the cement industry has been listed as one of the key areas of resource conservation. Under the State Council to speed up construction of a conservation-oriented society policy environment, improve conservation-oriented manufacturing and application level cement industry, cement industry, the establishment of conservation-oriented system is significant. In the current domestic and international energy supply and demand contradiction, the cement manufacturers must reduce energy consumption through a variety of ways to get the best value for money and the highest labor productivity. In cement production, motor load power consumption accounted for nearly 30% of the cost, and drag the fan motor with a high-pressure account for a large proportion in the motor for a cement production line of which 25% to 30% of the electricity is used drag the various types of fans, so do the work of saving efficiency blower motor becomes extremely important.

At present, many cement plant fan big horse car phenomenon is serious, while air flow due to the conditions, changes in production, the system needs also change, most of the fans using the traditional approach that adjustment, the outlet valve opening degree implementation, and the method is to increase wind resistance, sacrifice efficiency of the fan to meet the requirements of a serious loss. If the use of frequency control technology to change the speed of the device to adjust the size of the wind, it can not only satisfy the production requirements, but also to achieve energy savings, while reducing wear and tear caused by the deflector baffles and pipes and downtime often caused by Economic losses. With the development of power electronics technology and electronic technology, variable frequency technology matures, the international fan for air volume, air pressure adjustment has generally been abandoned by adjusting the throttle opening means supporting, and replacing them with variable-speed electric drive adjustment, variable frequency adjustment speed has become the best choice for electrical transmission scheme fans, pumps and energy saving.

In the cement plant fan frequency control technology, significant energy savings can be improved, improve production efficiency, cement plants bring great economic and social benefits. Depending on the fan experience a large number of cement production line of energy-saving high frequency control, after using frequency control, electric fan consumption decreased by 8% to 45%, electricity to 0.50 yuan / kWh basis, usually recoverable inverter 1.5 to 3.5 years equipment installation and other additional expenses, etc. the total investment.

2, high-voltage inverter in cement production line fan energy-saving applications and benefits

Frequency control technology is now used in various industries, smart VFD from 2005 onwards energy-saving motors used in the cement industry, has been successfully used in six positions process cement production line of high pressure fans, namely: raw mill circulating fans, coal mill circulating fan, kiln exhaust fan, high temperature kiln fan, kiln exhaust fan, cement mill circulating fan, and has made many successful transformation experience, access to significant economic benefits .

After the table is to select different types of high pressure blower frequency conversion transformation instantiated data saving test results in a fully loaded system, the same environment, the requirement under the process conditions:

Type of fan motor power voltage level adjustment block Bankai opening degree operating power (kW) operating current (A) operating frequency frequency-converted before saving rate frequency inverter raw mill cycle 630KW 6KV throttle 80% 50,037,225 36.5% 64 43 coal mill cycle 560KW 10KV throttle% 80% 50,038,224 372 437 kiln exhaust damper 710KW 6KV 70% 58,236,936 39.9% 70 34.8 kiln exhaust 1000KW 10KV water resistance 80% 84,071,015 39.7% 61 42.9 High temperature 2500KW 10KV circulating fluid coupling 90% 26,002,350 9.6% 15,514,345 cement mill cycle 355KW 10KV throttle 45% 19,010,545 6.2% 17 36

Of particular note is required to control the pressure in the preheater kiln dry cement production process kiln temperature circulating fan, need to be adjusted for the amount of hot air circulating fan through the DCS control, the original design generally use hydraulic speed control coupler, wound rotor string resistance velocity modulation, etc., but the basic trend is currently developed rapidly in the 1990s and in recent years has proven technology and performance of high voltage AC variable speed technology is far better than before speed mode adopted, after a large number of successful field application and shows its great energy efficiency, high-voltage inverter is a national cement energy conservation design standard equipment. In our October 25, 2007 promulgated mandatory standards since May 1, 2008 implementation of the "GB50443-2007 cement energy-saving design specifications," the provisions of paragraph 4.3.5: "The high temperature kiln fan should adopt frequency modulation speed means. "

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