Numerical Simulation Method and System for Pollutant Formation Process in Circulating Fluidized Bed Boiler

Abstract

The invention discloses a numerical simulation method and system for a pollutant generation process of a circulating fluidized bed boiler. The method comprises the steps of previously performing grid modeling on the circulating fluidized bed boiler to obtain a corresponding boiler grid model; solving a fluid phase equation and a particle phase equation of a three-dimensional space in the boiler grid model to obtain a mathematic model corresponding to the boiler grid model; and simulating the pollutant generation process of the circulating fluidized bed boiler during combustion in combination with chemical reaction formulae involved by the circulating fluidized bed boiler in a working process by utilizing the mathematic model to obtain a simulated model corresponding to the pollutant generation process. Compared with a conventional two-fluid model, the simulation method and system has the advantages that the influence of a particle phase on the mathematic model of the circulating fluidized bed boiler is added, so that the finally obtained mathematic model better conforms to an actual combustion process of the circulating fluidized bed boiler, and the simulation effect of the subsequent pollutant generation process is improved.

Description

technical field [0001] The invention relates to the technical field of boiler simulation, in particular to a numerical simulation method and system for the pollutant generation process of a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed boiler is a new type of clean coal combustion equipment developed in the past 30 years. High efficiency and other advantages. Circulating fluidized bed combustion technology is the technology with the most commercialization potential and the lowest pollution emission control cost among clean coal technologies. At the same time, due to the strong adaptability of coal types, it has also become the most effective way to absorb a large amount of coal gangue brought by coal production. means. [0003] Due to the complex fluidized state structure of circulating fluidized bed boilers, it is impossible to truly understand the three-dimensional unsteady flow structure of circulating fluidized bed with a sin...

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Problems solved by technology

[0004] However, the conventional technique is to numerically simulate the pollutant generation process of circulating fluidized bed boilers based on the two-fluid model, which is established under the basic assumption that solid coal combustion particles are treated as a fluid This leads to a large deviation between the numerical simulation results obtained based on this model and the actual pollutant generation process of the circulating fluidized bed boiler, the numerical simulation effect is poor, and it is difficult to adapt to the current increasing demand for circulating fluidized bed boilers Numerical Simulation Requirements

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