Method and system for measuring flow characteristic of biomass circulating fluidized bed boiler

Abstract

The invention provides a method and system for measuring a flow characteristic of a biomass circulating fluidized bed boiler. The method comprises the step of establishing an Euler double-fluid model used for simulating the flow characteristic of the biomass circulating fluidized bed boiler, the step of establishing a full size model of the biomass circulating fluidized bed boiler according to structural parameters of the biomass circulating fluidized bed boiler, the step of carrying out grid dividing on the full size model of the biomass circulating fluidized bed boiler and establishing a grid model of the biomass circulating fluidized bed boiler, the step of obtaining gas parameters, particle parameters, boundary condition parameters and initial wind speed of the biomass circulating fluidized bed boiler, the step of simulating the gas-solid two-phase flowing process inside the biomass circulating fluidized bed boiler according to the parameters, the Euler double-fluid model and the grid model, and the step of measuring a gas-solid two-phase velocity field distributing rule inside a furnace according to the simulated flowing process to obtain the flow characteristic of the biomass circulating fluidized bed boiler. By means of the method and system for measuring the flow characteristic of the biomass circulating fluidized bed boiler, measurement cost can be reduced, and the measurement period is shortened.

Description

technical field [0001] The invention relates to the technical field of biomass circulating fluidized bed boilers, in particular to a method and system for measuring flow characteristics of biomass circulating fluidized bed boilers. Background technique [0002] It only took more than ten years for the biomass circulating fluidized bed combustion technology to go from the laboratory scale to the large-scale commercial application. Because of this, various problems will occur during the operation of the biomass circulating fluidized bed boiler. The common faults of the circulating fluidized bed boiler in operation include wear, leakage of the air distribution plate, pulverization system and ash removal system. fault etc. Among the operating problems of various systems and auxiliary equipment of the boiler, the failure of the water wall of the furnace accounts for 17%, the problem of the convection heating surface accounts for 22%, the gas-solid separation mechanism accounts f...

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Problems solved by technology

[0004] Because different circulating fluidized bed boilers have different operating conditions such as fluidization wind speed and solid particle circulation rate, and because of the differences in gas-solid parameters such as fuel types and particle sizes, the gas-solid two The fluid characteristics of the phase flow are very complicated. If the traditional experimental method is used to measure the flow characteristics of the biomass circulating fluidized bed boiler, the cycle is long, the investment is high, and it is difficult to clearly describe the gas-solid two-phase in the biomass circulating fluidized bed. flow characteristics of the stream

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