Control method for adjusting amount of fuel entering boiler through flue gas oxygen content signal

Abstract

The invention relates to a fuel supply control method, in particular to a control method for adjusting the amount of fuel entering a boiler through a flue gas oxygen content signal. The method comprises the following steps of establishing a control rule superior to an optimization target according to load and air temperature distribution, obtaining the optimal flue gas oxygen content from the optimization control rule, and performing deviation operation according to a current flue gas oxygen content signal and the optimal flue gas oxygen content to obtain a total fuel correction signal; and accurate controlling is carried out on the amount of the fuel entering the boiler according to the total fuel correction signal. Control operation selects an incremental PID algorithm. According to thecontrol method, through the optimal change rule of the flue gas oxygen content along with the load and the steam temperature, the amount of the fuel is intervened in advance and accurately, and the response speed of the load of a coal-fired unit is increased; and the safety and stability of the boiler in the operation process are improved, the heat efficiency of a power plant is effectively improved, and energy consumption is reduced.

Description

technical field [0001] The invention relates to a control method for fuel supply, in particular to a control method for adjusting the amount of fuel fed into a boiler by utilizing the oxygen content signal of flue gas. Background technique [0002] Effectively improving the thermal efficiency of power plant operation and reducing energy consumption has always been an inevitable requirement for the development of my country's economy and power industry. Among them, whether the control and adjustment method of air volume and fuel volume is effective is an important factor affecting the thermal efficiency of boiler combustion. For coal-fired power plants, the main task of the combustion control system is to control the amount of fuel during operation to meet the requirements of steam pressure or load output, and to adjust the air supply volume through the deviation of flue gas oxygen content, while ensuring the boiler operation process. Safety, stability and economy. [0003] ...

AI Technical Summary

Problems solved by technology

This control method is based on the control strategy of "air-to-coal ratio" and "water-to-coal ratio", and adopts the adjustment method of relevant parameter deviation-feedback-output to realize the adjustment of fuel into the furnace. The detection signal and the control of a single loop do not analyze and utilize the "massive data" in each operating condition of the unit, and cannot timely analyze the fuel volume, air volume, damper opening, water supply, etc. according to the coal quality and load changes. Coordinated optimization control cannot adapt to rapidly changing load conditions, and cannot adapt to changes in regulation performance caused by changes in the characteristics of external equipment such as fans, and the system has poor anti-disturbance ability

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