Ball mill of new control strategy research and application

Abstract: the ball mill control strategy research and application of new information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Introduction in China's small and medium-sized coal-fired power plant, ball mill pulverizing system has been widely used, and the system is in addition to the boiler combustion system in power plant of another important regulating system. Coal pulverizing system's task is to contain a small amount of limestone coal through the steel ball coal mill. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the ball mill control strategy research and application of new article details. Introduction in China's small and medium-sized coal-fired power plant, ball mill pulverizing system has been widely used, and the system is in addition to the boiler combustion system in power plant of another important regulating system. Pulverizing system's task is to contain a small amount of coal by ball mill grinding of limestone, made from a certain fineness of pulverized coal, and through the boiler wind drying, conveying and separation, zui pulverized coal will all bunker. Including the original coal pulverizing system, vibration control device, feeding coal thickness powder separation equipment, ball mill, powder, ground dragon lose powder gate, mill inlet control valve, ball mill hot, cold, isolation, recirculation control valve, three times the wind, the exhaust valves such as risk control system, system of measuring equipment, is a relatively large wind powder mixed system. Ball mill coal pulverizing system of large capacity ( Ball mill power is generally only a few hundred kw) , because use intermediate storage system, the system for the intermittent operation mode, start-stop more frequently, so the disturbance of boiler combustion system. For pulverizing system, how to keep the coal mill zui large output, in order to make tons of coal consumption zui province is system control goal. But as a result of ball mill is a multivariable coupling serious nonlinear systems, the conventional control scheme is very difficult to achieve control objectives. This paper takes nantong a thermal power plant control of ball mill pulverizing system as an example, the dynamic performance analysis of the ball mill, on the basis of an effective control strategy is proposed. This control strategy USES the soft measurement technology for grinding load information, through coordinated controller of ball mill load and exit temperature control. By controlling the heat and cold air volume ratio to achieve control of the ball mill entrance negative pressure. Controller adopts fuzzy PID control algorithm, the use of fuzzy control to realize the effective control of dynamic process, using PID control to ensure steady state accuracy of the system. The practical running results show that the control strategy can achieve satisfactory control effect. A dynamic characteristic analysis of ball mill, ball mill pulverizing system at the core of the device is a ball mill. Ball mill is a complex consists of mechanical energy conversion, heat exchange equipment. Figure 1 schematic for ball mill input/output. Ball mill input generally have cold air volume Fr, hot air Fh and Fc to coal quantity. Five entrance negative pressure P and controlled quantity, exit temperature T, and L mill load. The control of the ball mill entrance negative pressure significance is to make the whole ball mill is in negative pressure condition, to prevent the coal powder and ball mill is too large air leakage. Ball mill outlet temperature is refers to the temperature of the ball mill outlet wind powder mixture, it is reflecting the ball mill and dry pulverized coal output, prevent the deflagration or explosion of the important parameters. Mill load is reflected when milling drum memory coal. In the process of ball mill run, by adjusting to the coal quantity, hot air and cold air quantity, to ensure the quantity of coal in the ball mill drum ( The mill load) , mill outlet temperature and inlet negative pressure respectively in near zui better value, so that the ball mill run efficiently. The motor power of the ball mill PD, import and export pressure difference delta P, mill output Q and the relationship between the coal mill body save coal N [ 4] As shown in figure 2. In the characteristic curve of Ⅰ area, ball mill power consumption is big, small output; Ⅲ area easy plugging coal; Motor power is not zui big Ⅱ area, but the output for zui big ball mill, it is the ideal workspace. By the characteristic curve can also see, import and export pressure difference can indirectly reflect the ground load. Can be concluded from the above analysis: ball mill is a high order, large pure delay and parameter coupling dynamic characteristics. The mathematical model of structure can be approximated as type of K for gain; τ As the time constant; T for the pure lag time. From the step response time of coal mill entrance negative pressure fast response zui, inward and outward pressure differential zui slow response and the ratio of time a few decades. The time response speed are reflected in the type of time constant. Type is under the condition of a linearization. In fact dynamic characteristics of a ball mill is changing, it is mainly manifested in the ability to scale and the scale features and the differences between the difference of signal delay time length. Ball mill entrance pressure differential in the hot air with zui large amount of powder is within the scope of the characteristics of the performance for the scale ability, while outside the zui great value when the characteristics of performance for self ability of equilibrium. Inlet pressure and outlet temperature of delay than the differential delay. Dynamic characteristics of ball mill, this greatly increased the difficulty of control. To sum up, the reason of ball mill is difficult to control can be summed up in the following four points. 一个。 System with multivariable strong coupling characteristics. Such as outlet temperature of the ball mill entrance negative pressure p and T between coupling is very serious. b。 The signal is difficult to measure. Mill load is difficult to directly measure.

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