The cement industry is one of the key areas of national energy conservation. It is of great significance to establish a conservation-oriented and environmentally-friendly cement industry system. In the current contradiction between energy supply and demand at home and abroad, the cement industry must reduce energy consumption through various means to obtain the best economic benefits and the highest labor productivity. Like the current new dry process cement production technology, variable frequency speed control technology, waste heat power generation technology, etc. have been widely used in the cement industry.
Article 4.3.5 of the mandatory standard “Energy-saving design code for cement plants of GB50443-2007 (executed from May 1, 2008) promulgated by the State on October 25, 2007 clearly stipulates: “The high-temperature fan at the kiln end should adopt frequency conversion Speed device". As we all know, the high-temperature fan at the kiln end of the dry cement production line is an important load to ensure the negative pressure in the kiln. However, in the past, the high-temperature fan that was operated at the power frequency and adjusted by the hydraulic coupler often caused the high-temperature fan motor due to the “collapse” of the pipeline. Overload tripping, which leads to production interruption; while the traditional frequency converter is limited by the load capacity of the power electronic device, if there is no targeted technology to solve the high temperature fan overload problem caused by the collapse, the inverter protection shutdown will also occur. A huge loss to cement production. The overload caused by the “collapsed material” of the high-temperature fan is due to the fact that during the production process of the rotary kiln cement production line, the dust on the wall of the preheater adheres to a certain thickness and naturally collapses, causing the dust concentration in the pipeline to increase and the resistance to increase. The negative pressure is increased; if the exhaust fan load is increased or if the vertical flue or the preheater is in the clear skin or the material collapses, the air flow will also be fluctuated; the air flow in the exhaust pipe will be disordered, causing the high temperature fan to be overloaded. Downtime, the frequent occurrence of this phenomenon can cause damage to the motor of the high temperature fan. In the actual use process, the phenomenon of “collapse material” will cause the motor running current to exceed the normal current several times in a very short time. If the general-purpose high-voltage inverter of the general manufacturer is used, the inverter will run. Frequent jumps in the machine directly affect the normal operation of the high temperature fan and the production line.
Since 2005, the high-voltage inverter of Dongguan Derek Intelligent Electromechanical Equipment Co., Ltd. has been applied and promoted in the cement industry, and has conducted in-depth application research on related aspects, and summarized the field application experience, using the self-developed "transient" The peak load differential control technology, the first to launch the "cement production line kiln tail high temperature fan dedicated inverter", to fill the gap in the application of the current domestic project. The Dreico ZINVERT high-voltage inverter realizes all-round targeted design improvement for the irregular peak load operation of the high-temperature fan from the hardware design and control software design of the equipment. "High-frequency fan-specific inverter" effectively avoids the repeated tripping of the general-purpose high-voltage inverter of other manufacturers due to "collapse" during operation; compared with the commercial frequency liquid-coupled operation, it also reduces the possibility of tripping Therefore, the cement production line using the high-frequency fan-specific inverter developed by Drake has achieved energy saving and efficiency, and also reduced the failure rate of the motor and fan equipment, providing cement companies with guarantees of production safety and economy. Technology and equipment guarantee.
