Medium-speed mill self-starting and self-stopping control system suitable for deep peak regulation of direct blowing type coal-fired unit

Abstract

The invention discloses a medium-speed mill self-starting and self-stopping control system suitable for deep peak regulation of a direct blowing type coal-fired unit, belongs to the field of automaticcontrol of clean and efficient coal-fired power generation, and aims to improve the running flexibility of the unit for adapting to power grid dispatching. The system relates to automatic control ofa whole-course fuel and pulverizing system in a deep peak regulation process; two coal mills operate under the working condition of deep peak regulation at 30%; in the starting / stopping automatic control of the coal mills, an intermediate staying control and actual coal quantity delay calculation strategy is added, so that the large fluctuation of coal quantity change on the superheated steam temperature and reheated steam temperature of a boiler and nitric oxide at an inlet of a denitration system is inhibited, and the impact of starting / stopping mills on the boiler system is reduced; in thestarting / stopping automatic control of the coal mills, an override control strategy for the temperature of a mill outlet is added, so that the abnormities of high temperature of the coal mill outletsduring mill stop and low temperature of the coal mill outlets during mill start are avoided; and after the coal mills are sequentially controlled and stopped, the coal mills are in a hot standby state, flexible restart of the coal mills is facilitated, and the start time is saved.

Description

technical field [0001] The invention belongs to the field of automatic control of clean and high-efficiency coal-fired power generation, and in particular relates to a medium-speed mill self-start-stop control system suitable for deep peak regulation of a direct-blown coal-fired unit, which is used to improve the unit's ability to adapt to the operation flexibility of power grid scheduling. Background technique [0002] Renewable energy represented by wind power and solar power is developing rapidly, but its output power is random, intermittent and unstable, which puts forward higher requirements for load control and flexible operation of the power grid. Therefore, major domestic power grids require large-scale peak-shaving operation of thermal power units on the power source side, and compensating for double random disturbances on the power source side and the load side of the power grid is an effective measure to alleviate and solve this contradiction. At present, most the...

AI Technical Summary

Problems solved by technology

[0007] (1) The operation mode of three coal mills is adopted, and oil guns are often used for a long time to support combustion, which is uneconomical;

[0008] (2) The manual operation of the operator to start and stop the coal mill requires a relatively stable working condition, which actually results in a longer time-consuming load lifting and slow response to the load on the grid side;

[0009] (3) In the process of starting and stopping the coal mill, due to many operations, it needs the cooperation of multiple people to complete

Due to the differences in the professional skills of the operators, there may be inconsistencies in the timing of starting and stopping the coal mill and the rate of variable load. At the same time, all parameters are monitored and adjusted by the operators during the process of starting and stopping the coal mill. In place, it may cause the temperature of the coal mill to be high, or even the possibility of the coal mill tripping

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