Control method of simulating primary air volume for coal pulverizer of coal-fired unit

Abstract

The invention discloses a primary air flow simulation control method for coal mills of a coal-fired unit. The method comprises the following steps of: (1) performing integrated computation according to parameters such as the openness of a primary air baffle of each coal mill and the pressure of a primary air main pipe of each coal mill, and thus obtaining the primary air flow of each primary air baffle and the total primary air flow of the coal mill which is in an operating state; (2) forming an air flow instruction of the primary air baffle of each coal mil which is in an automatic regulation state according to a primary air flow instruction of each coal mill, which is sent by a boiler-turbine coordinated control system, or a coal flow instruction of each coal mill; and (3) computing an instruction for the openness of the primary air baffle of each coal mill which is in the automatic regulation state according to a coal mill primary air baffle openness-air flow characteristic function curve and the pressure of the primary air main pipe of each coal mill. The method has the advantages that the automatic regulation of the primary air baffle of each coal mill of the unit can be smoothly realized, unit coordinated control can be smoothly realized, an automatic gain control (AGC) function of the coal-fired unit can be normally realized, and the safety, stability and economic performance of grid and unit operation are improved.

Description

Technical field [0001] The invention belongs to the technical field of thermal power automatic control methods for thermal power plants, and is a method that can participate in automatic adjustment through calculation and simulation of the primary air volume when the primary air volume of the coal mill cannot be accurately measured, so that the fuel adjustment and coordinated control can be smoothly put into use Control method. Background technique [0002] At present, my country's electricity is still dominated by coal-fired power generation, and this status quo will continue for decades. With the continuous improvement of the automation of power dispatching and the increasing requirements for energy saving and emission reduction of the power system, the AGC control of coal-fired units is required to be stable and high-quality commissioning. The primary air volume measurement device of the coal mill is poorly installed on site. Based on the current measurement technology, most ...

AI Technical Summary

Problems solved by technology

The primary air volume measurement device of the coal mill is not installed in a good location on site. Based on the current measurement technology level, most of the measurement devices use wind speed to calculate the flow rate, such as: differential pressure Pitot tube, Annubar, etc., thermal speed measurement The air volume measuring device and so on, this method is affected by the insufficient straight pipe section installed on site, the measurement accuracy is not high, and even the trend of air volume measurement is opposite to the opening of the damper.

The air volume measurement of coal mills in many thermal power plant units is inaccurate, resulting in the automatic failure of the mill air volume to be put into use, and the fuel adjustment, coordination control system and AGC control cannot be put into use normally, which affects the operating economy and stability of the unit, and also makes the The dispatch control index of the power grid is greatly affected

[0003] There are two ways to solve the problem of inaccurate measurement of the primary air volume. One is to research and develop a more accurate measurement device, which requires the research and development unit to have a certain strength and achieve a technological breakthrough, and the replacement of the new device of the power plant requires more investment. human and financial resources

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