Simulation method and device for generation value of combustion characteristic of pulverized coal of power station boiler

Abstract

The invention discloses a simulation method and a simulation device for a generation value of a combustion characteristic of pulverized coal of a power station boiler, and solves the technical problem that the whole rule characteristics of combustion, flowing and heat transfer in the boiler cannot be measured due to the fact that a conventional hearth cannot be used for manufacturing a test bed of a full-size model as the size of the hearth is larger and larger. The method comprises the following steps: simulating a combustion process of the pulverized coal of the boiler in a preset boiler combustor model subjected to gridding division through a basic conservation equation, a turbulent flow model, a turbulent gas-solid two phase flow model, a gas phase turbulent combustion model, a pulverized coal particle combustion model, a radiation heat exchange model and an NOX generation model; determining a gas flow field in a boiler combustor, a temperature field in the boiler combustor, flue gas component distribution in the boiler combustor, a moving trace of pulverized coal particles in the boiler combustor, radiation heat flow on the wall surface of the boiler combustor, the boiler combustion efficiency and an NOX discharge amount according to a simulation result.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and device for simulating numerical values ​​generated by pulverized coal combustion characteristics of power plant boilers. 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 lar...

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 NOX generation model simulate the combustion process of boiler pulverized coal in the preset boiler burner model after grid division; determine the airflow field in the boiler burner, the temperature field in the boiler burner, The distribution of flue gas components in the boiler burner, the movement trajectory of pulverized coal particles in the boiler burner, the radiant heat flow on the wall of the boiler burner, the combustion efficiency of the boiler and the NO X The emission rate solves the technical 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.

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