Oxygen volume adjusting method and system for pulverized coal boiler after change of coal type

Abstract

The invention discloses an oxygen volume adjusting method for a pulverized coal boiler after a change of coal type. The method comprises the following steps: a grid structure model of the pulverized coal boiler is built; a mathematical model of various physical and chemical processes generated in pulverized-coal combustion is built; the pulverized-coal combustion process after the change of coal type is simulated to obtain the corresponding relation between various oxygen volumes and the burning performance indexes of the pulverized coal boiler; and the oxygen volume of the pulverized coal boiler is adjusted to allow the pulverized coal boiler to meet preset burning performance indexes. In addition, the invention further discloses an oxygen volume adjusting method for the pulverized coal boiler after the change of coal type. The method and system provided by the invention can improve the accuracy rate and security of pulverized coal boiler oxygen volume control after the change of coal type, solve the problems of unstable furnace combustion and low combustion efficiency easily caused by manual control, and simultaneously greatly reduce pollutants produced during the process of combustion.

Description

technical field [0001] The invention relates to the technical field of pulverized coal boilers, in particular to a method for adjusting the oxygen content of the pulverized coal boiler after changing the type of coal fired and an oxygen content adjustment system for the pulverized coal boiler after changing the type of coal fired. Background technique [0002] With the increasing power consumption, the demand for coal is also increasing, and the contradiction between the production and transportation of thermal coal and the demand for electricity is becoming more and more prominent, which has become a bottleneck restricting my country's current economic development. While the supply of coal continues to be tight, the price of coal continues to rise, resulting in an increase in the cost of power generation. In order to reduce the cost of power generation, power plants have begun to look for low-priced coal types, which makes it difficult for most power plants to guarantee the...

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Problems solved by technology

[0004] However, for the four-corner tangential pulverized coal boiler widely used in power plants, there is still a lack of mature research on the influence of different oxygen levels on the combustion characteristics of the boiler after switching to non-design coal types (for example, lean coal boilers are converted to bituminous coal). Engineering applications, such as the impact of changes in coal quality characteristics on boiler burnout, slagging and ash deposition after the boiler is converted to burn other types of coal, are currently mostly controlled by manual experience, which seriously affects the safety and economy of boiler operation sex

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