An experimental device and method for studying the combustion characteristics of pulverized coal particles in a turbulent flow field

Abstract

The invention discloses an experimental device and method for studying the combustion characteristics of coal powder particles in a turbulent flow field, belonging to the technical field of coal powder combustion. The upper cover plate, the middle plate and the lower cover plate are fixedly connected in turn, and the upper cover plate communicates with the internal channel of the middle plate to form a closed combustion chamber; the middle plate is provided with a number of slits tangent to the combustion chamber, and the slits are respectively It is connected with an air inlet, and the air inlet is connected with the fuel system and the oxidant system; the lower end of the outer quartz tube is connected with the upper cover plate and communicated with the combustion chamber; the outlet of the central powder supply pipe extends into the combustion chamber, and the inlet is connected with the pulverized coal system; The inner quartz tube is coaxially nested inside the outer quartz tube, and has a distance from the lower end of the outer quartz tube; the outlet end of the central powder feeding tube is provided with a rotary vane inside. The invention can accurately control the turbulence intensity of the flow field, and the temperature and components in the field are evenly distributed, so as to realize the research on the combustion characteristics of coal powder particles in different turbulent flow environments.

Description

technical field [0001] The invention belongs to the technical field of pulverized coal combustion, and in particular relates to an experimental device and method for studying the combustion characteristics of pulverized coal particles in a turbulent flow field. Background technique [0002] Pulverized coal combustion is a process involving complex variables such as transient, multiphase, multicomponent, high temperature, and turbulent flow. The research on the mechanism of pulverized coal combustion spans different time and space scales. Existing industrial boilers and power plant boilers have large capacity and large scale. Measurements and numerical simulations based on actual boilers are mostly based on statistical time-average or space-average measurements of Euler fields, and it is difficult to achieve particle level Analysis at the mechanistic level. In order to better adjust the combustion inside the furnace and lay a theoretical foundation for realizing clean coal c...

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Problems solved by technology

However, this study mainly focuses on the influence of the concentration of components in the environment on the combustion characteristics of pulverized coal particles, and lacks a discussion on the influence of turbulence

This is partly due to the difficulty of fine-tuning the turbulence field produced by this burner

[0005] At the same time, most of the existing research studies the behavior of the turbulent field from the perspective of the Euler field, and lacks a detailed discussion on the combustion behavior of coal particles in the turbulent field.

For example, the patent with authorized publication number CN109595548B reports a kind of thick-lean back-mixing type swirl pulverized coal burner. Ignition and stable combustion, but the operating conditions of the burner still limit the feasibility of in-depth exploration of the influence of the turbulent flow field at the single particle level, and its fixed burner structure limits the reasonable adjustment of its internal turbulent flow field

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