Application of Frequency Converter in Cement Industry Renovation
Abstract: In the cement manufacturing industry, the high power consumption of certain high-powered and continuously operating equipment is an important factor in the high cost of cement manufacturing. According to statistics, the cost of electricity in cement manufacturing costs account for about 30% of the total cost, so it is necessary to make some energy-saving technological improvements on the equipment with corresponding large power consumption to reduce the manufacturing cost of cement by using the power-saving effect , Improve the operating profit margins and market competitiveness. Foreword By understanding the cement manufacturing process, and the actual inspection of some cement plant production equipment, most of the cement plant equipment, especially some high-power equipment in the production process most of the time are not satisfied with the load, the degree of automation equipment operation is quite low , Almost entirely by manual adjustment, such as shaft kiln air supply system, into the ball pre-water system, raw material feed system homogenization, cement powder system, shaft kiln discharge system. Pu Chuan and Tianma Cement Co., Ltd. engineering and technical personnel through the long-term follow-up study of the system, combined with the transformation of dozens of cement production lines of practical experience and developed a relatively mature cement plant five major production systems VVVF control transformation programs This investment is less, installation, commissioning and control is convenient, reliable operation, energy-saving effect is obvious, and improve the automation of the production process and processing precision, welcomed by the cement manufacturing industry. A total of three cement production line Co., Ltd. mud production line, we first start in April 2002 on a 132 kW fan fan frequency conversion transformation, after a period of time to prove the energy saving effect is particularly evident, so from the second half of last year, one after another Up to now, it has invested about 1.3 million yuan in inverters for blowers (245 kW, 215 kW, two), powder separators, powder blowers, and tower pallets, etc., and has transformed from 1.5 KW to 250 KW size a total of 130 sets of motor. After the transformation of the actual test shows that in a few months time by the savings on electricity to recover the overall investment in the future production and operation can also lower the cost of production in the market in a more competitive position. The following on the Cement Co., Ltd. to transform the situation to analyze the above system, the actual effect of frequency transformation programs. A shaft kiln air supply system frequency conversion device Like other old cement companies, the Cement Co., Ltd. machine shaft kiln air supply system is by adjusting the windshield opening angle of the backward mechanical adjustment method to meet the different sintering air volume, the disadvantage of this mode of operation is obvious : 1, a serious waste of electricity; 2, poor regulation accuracy; 3, starting current on the grid impact; 4, high speed motor and fan, heavy load intensity; 5, start mechanical shock, low equipment life; , Noise, dust pollution and so on. After the transformation of the inverter air supply system is to retain the original air supply system based on the addition of a variable frequency circuit in parallel with the original circuit to form a dual circuit switchable control system and frequency converter speed control device installed in the kiln by adjusting Motor (fan) speed to adjust the amount of air used when sintering. Its characteristics: 1, energy-saving effect is good (due to motor power consumption with the motor speed is proportional to the third power, after the transformation of the motor most of the time running around 35-40Hz can meet the air volume, saving rate of more than two percent 10); 2, with soft function, reduce the load strength and extend the service life of equipment, starting current is small, equivalent to increase the grid capacity; 3, adjust the air volume accuracy is accurate and convenient; 4, without bypass ventilation, reduce the cement dust pollution . After the transformation of the test results in Table 1. Second, the ball water system Raw material into the ball process is one of the key processes affecting the quality of cement clinker sintering, in which the proportion of water, material directly affect the ball into good or bad. After the frequency converter is applied, the speed of the ball pre-feeding pump can be steplessly adjusted by tracking the feeding amount of the raw material so as to realize the fully automatic closed-loop control. With the steady cooperation of the material water and the balling effect, the quality of the cement sintering is greatly improved. This system is mainly to improve the degree of automation and manufacturing technology to consider, due to lower power consumption is still the second power efficiency.
Stage Collars mainly consists of two-stage coupling (body), first-stage plug, shut-off baffle, free-fall opening plug and closing plug.
1. It adopts inner-closing structure and locking device on closing sleeve. Lock is reliable after closing. Cementing Tool Mechanical,Cementing Plug Supplier Puyang Junhong Rubber Co., Ltd. , https://www.pyjhxs.com
2. The liquid would not occur in the loculum when opening or closing.
3. The ID. of upper/lower sub should be the same as that of casing, it can protect the body of stage collar from damaging when the bits going down and doing drill-out operation.
4. All the accessories are made in the drillable rubber or aluminum material. They have the function of anti-rotation , it can make drillout easy.
5. You can use pumping-down plug to carry out continuous process.
6. Apply to the well deflection should be ≤25°