Double-inlet double-outlet steel ball coal mill straight blowing type milling system optimized control method

Abstract

The invention discloses an optimum dual-inlet and dual-outlet steel ball coal grinding machine direct-blow type powder-preparation control method. The method obtains the material position of the coal grinding machine after carrying out soft-measurement processing by collecting the noise material position of the coal grinding machine, the material position of pressure difference, the current of the coal grinding machine, one-time air quantity, one-time opening of the hot wind door and the cold wind door of an inlet, inlet temperature and outlet temperature; the control comprises material position control, air quantity capacity control, bypass air quantity control and the temperature control of the inlet and the outlet; the material position is optimized and the best material position of the coal grinding machine is searched online so as to ensure the combustion safety of the boiler and coal powder supply quantity when the load of the boiler is adjusted. The boiler combustion is optimized: according to the boiler technology, the load and the running working conditions, the powder supply quantity and the ventilation quantity of each coal grinding machine are optimized and the combustion efficiency of the boiler is improved. Malfunction diagnosis, running evaluation and analysis are carried out to the system and reasonable suggestions are provided so as to ensure the system to run continuously, stably, safely and economically; the optimum dual-inlet and dual-outlet steel ball coal grinding machine direct-blow type powder-preparation control method is widely applied to the dual-inlet and dual-outlet steel ball coal grinding machine direct-blow type powder-preparation system or industrial similar systems in other industries.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to an optimal control method for a direct-blown pulverizing system of a double-inlet and double-outlet steel ball coal mill. Background technique [0002] The double-inlet and double-outlet steel ball coal mill is the main equipment of the direct blown coal pulverization system in thermal power plants. This equipment has high continuous operation rate, convenient maintenance, stable grinding output and fineness, large storage capacity, quick response, It has the advantages of high operating flexibility, low air-to-coal ratio, wide range of applicable coal types, no influence of foreign matter, no need for backup coal mills, etc., and can grind various hard and abrasive coal types. It is a boiler system for thermal power plants. In addition to the medium-speed direct-blown coal mill and the high-speed fan-type coal mill, there is another direct-blown coal mill with superior...

AI Technical Summary

Problems solved by technology

[0003] The pulverization system of the double-inlet and double-outlet steel ball mill coal mill is relatively complicated and has a lot of equipment, so the automatic control fails to achieve the desired goal

At present, the material level of the coal mill is reflected by the existing measuring device or other operation-related quantities, and the operation mainly depends on the manual operation of the operator. Therefore, when the operation status (including load, coal quality, etc.) changes, it is difficult to adapt to it in time. variation, it is difficult to achieve the best adjustment quality

Because there is no accurate and effective measurement of the material level in the pulverizer to control the key quantity, material level control (or automatic control of coal feeding) cannot be realized, because the adjustment quality of coal feeding will directly affect the quality of pulverized coal, the quality of boiler combustion and the automatic operation of the unit. Adjustment performance, so it will directly affect the automatic input of CCS and AGC, affect the automatic input rate of the unit and the safe and economical operation of the unit

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