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coal mill differential pressure

modeling and control of coal mill - sciencedirect

modeling and control of coal mill - sciencedirect

The paper presents development and validation of coal mill model (including the action of classifier) to be used for improved coal mill control. The model is developed by using the mass and heat balance equations of the coal mill. Genetic Algorithm is used to estimate the unknown parameters that are used in the model validation. The advantage is that the raw data used in modeling can be obtained without any extensive mill tests. The simulation results show a satisfactory agreement between the model response and measured value. Apart from the conventional PID controller, inorder to ensure tight control with less overshoot and to handle constraints Model Predictive Controller is designed to maintain outlet temperature and pulverized coal flow at desired set point value.

review of control and fault diagnosis methods applied to

review of control and fault diagnosis methods applied to

Power plant performance and reliability is highly influenced by coal mills that grind, dry, and transport coal to the furnace. This paper presents a review of the current state of technology on improved controls and fault diagnosis methods applied to mills. An understanding of the mill system, control issues and major faults influencing the mill performance are discussed. Control strategies applied for mill controls such as control using estimated pulverized fuel flow and advanced techniques such as decoupling control, predictive control, fuzzy control, self-optimizing control, and some other combined control algorithms are presented. Fault diagnosis techniques for mills are segregated into quantitative, signal, qualitative, and process history based approaches depending on the priori information used for the diagnosis. Comparative study of different control and fault diagnosis techniques applied to the milling system is conducted and possible directions are provided for future research.

coal hang-up in bowl mill operations - bright hub engineering

coal hang-up in bowl mill operations - bright hub engineering

Bowl mills are used for pulverizing coal in pulverized coal fired boilers. The coal to the mill is fed by a coal feeder from the coal bunker. There are many type of feeders used for coal feeding like the belt feeder which can be in volumetric or gravimetric mode, the chain link feeder, the drag feeder, etc. Row coal from the yard is sized in crushers and stored in coal bunkers. It is sometimes experienced, depending upon coal quality, that the smooth flow to the coal mill can get disrupted. The mill will trip on no coal flow protection, and such a mill trip can upset boiler parameters and require corrective action.

For taking corrective action during a coal hang-up in bowl mills, the operator will have to know the reason for such a hang up, how the plant will respond, what he has to respond to, and what the local operator will have to do. This will reduce the chance of mill trip and bring the boiler back to normal condition as early as possible.

The reasons for coal hang-up to mills can be many, like large raw coal size, jamming of the feeder, jamming of the coal chute from the bunker due to high moisture in the coal, foreign material at raw coal inlet to feeder, etc.

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