Smoke concentration adjustment method and smoke concentration adjustment system after fire coal variety of pulverized coal boiler is changed

Abstract

The invention discloses a smoke concentration adjustment method after the fire coal variety of a pulverized coal boiler is changed. The smoke concentration adjustment method after the fire coal variety of the pulverized coal boiler is changed comprises the following steps: establishing a meshing structural model of the boiler, establishing a mathematical model of each physical and chemical process formed by combustion of pulverized coal; imitating a pulverized coal combustion process after the fire coal variety of the pulverized coal boiler is changed, and obtaining a corresponding relation between various smoke concentration situations and boiler combustion performance indexes; and adjusting the smoke concentration of the boiler so that the boiler meets preset combustion performance indexes. Besides, the invention further discloses a smoke concentration adjustment system after the fire coal variety of the pulverized coal boiler is changed. The smoke concentration adjustment method and the smoke concentration adjustment system after the fire coal variety of the pulverized coal boiler is changed can improve the accuracy and safety of smoke concentration control after the fire coal variety of the pulverized coal boiler is changed, resolve the problems of unstable combustion in the boiler and low combustion efficiency easily caused by manual control, and largely lower pollutants produced in the combustion process.

Description

technical field [0001] The invention relates to the technical field of pulverized coal boilers, in particular to a method for adjusting flue gas concentration after the pulverized coal boiler changes the type of coal fired and a system for adjusting the flue gas concentration after the pulverized coal boiler changes 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 guar...

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Problems solved by technology

[0004] However, for the four-corner tangential pulverized coal boilers widely used in power plants, after switching to non-design coal types (for example, lean coal boilers are converted to bituminous coal), the influence of different flue gas concentrations on the combustion characteristics of the boiler is still not mature. For example, the influence of changes in coal quality characteristics on boiler burnout, slagging and ash deposition after the boiler is converted to other coal-fired types is currently mostly controlled by manual experience, which seriously affects the safety and security of boiler operation. economy

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