Method and device for simulating combustion characteristics of pulverized coal of utility boiler

Abstract

The embodiment of the invention discloses a method and device for simulating the combustion characteristics of pulverized coal of a utility boiler, and solves technical problems in the prior art that the measurement of the overall rule and characteristics of combustion, flowing and heat transfer of a furnace cannot be carried because the manufacturing of a full-size model test bench is unrealistic because of the increasing size of a hearth. The method comprises the steps: carrying out the simulation of a combustion process of boiler pulverized coal in a preset boiler burner model on a variable load condition through a basic conservation equation, a turbulent flow model, a turbulent flow gas-solid two-phase flowing model, a gas phase turbulent flow combustion model, a pulverized coal particle combustion model, a radiation heat transfer model and an NOX generation model after grid dividing; and determining the pulverized coal burn-off rate, unburned carbon content, NOX discharge and lower hearth outlet temperature of the boiler burner according to a simulation result under the variable load condition.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and device for simulating combustion characteristics of pulverized coal of a power station boiler under variable loads. Background technique [0002] Pulverized coal combustion in power plant boilers is a complex three-dimensional process of turbulent flow, heat transfer and combustion. Due to the complexity of the process and the variability of coal-fired boiler fuel, so far, there is a lack of mature theory and experience in the design and operation of boilers, and cold and hot tests are often required to determine the operating and design parameters, because the test is intuitive, Reliability and other advantages can be directly used to guide the design, production and manufacture of boiler products. However, at present, my country's thermal power plants have developed towards high parameters and large capacity, and the size of the furnace is getting larger a...

AI Technical Summary

Problems solved by technology

In this embodiment, the preset boiler burner model is partitioned and meshed; the basic conservation equation, turbulent flow model, turbulent gas-solid two-phase flow model, gas phase turbulent combustion model, pulverized coal particle combustion model, radiation heat transfer Model and NO X The generated model simulates the combustion process of boiler pulverized coal in the preset boiler burner model after grid division under variable load conditions; according to the simulation results under variable load conditions, the pulverized coal burnout rate of the boiler burner, Carbon content of fly ash, NO X The discharge rate, the outlet temperature of the lower furnace, and the temperature at the outlet of the lower furnace solve the problem that it is impossible to measure the overall regular characteristics of combustion, flow and heat transfer in the furnace due to the increasing size of the furnace and the impracticality of manufacturing a full-scale model test bench. technical issues

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