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Device and method for measuring critical rebound velocity of hot fly ash particles

A technology of rebound velocity and measuring device, which is applied in the direction of measuring device, fluid velocity measurement, velocity/acceleration/impact measurement, etc., which can solve the problems such as the limitation of the adjustable range of impact velocity and the inability to directly measure the critical rebound velocity of particles, so as to avoid Precipitation effect

Active Publication Date: 2020-07-03
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the adjustable range of the impact velocity of the former combustion particles is limited, so the critical rebound velocity of the particles cannot be directly measured.

Method used

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  • Device and method for measuring critical rebound velocity of hot fly ash particles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, a thermal collision test device for fly ash particles in this embodiment is mainly used to more realistically simulate the characteristics of the collision between fly ash particles and the surface of the heat exchanger under the high temperature condition of the boiler. The collision process of the parts that are prone to ash and slagging on the surface of the inner heat exchanger, through the experiment of fly ash particles hitting the surface of the heat exchanger under different airflow velocities, judge the critical rebound velocity when the fly ash particles of different particle sizes hit the platform , so as to provide experimental data for the modeling of the critical rebound velocity.

[0039] In addition to the heating furnace 11, infrared thermal imaging camera 12, high-speed camera 13, and support platform 14 included in traditional similar experimental devices, the device also includes fly ash supply components, gas source compon...

Embodiment 2

[0050] This example provides the method of using the fly ash particle thermal state collision test device in Example 1, which can simulate the impact of fly ash particles under conditions such as different particle sizes, different furnace temperatures, different incident velocities, and different heat exchanger surface materials. Collision experiments, more comprehensive, reliable and accurate research on the thermal collision characteristics of fly ash particles.

[0051] The method for using the critical rebound velocity measuring device of hot fly ash particles is as follows:

[0052] First, take milligram-level fly ash and put it into the fly ash container 1, add water to dilute it, and stir it with a magnetic stirrer 2; The nitrogen gas heated by the preheating furnace 5 enters the furnace 9, and the water vapor evaporates rapidly in the furnace 9, while the fly ash particles are ejected from the lower end of the furnace 9 and shoot to the surface of the supporting platf...

Embodiment 3

[0057]This embodiment provides a method for measuring the critical rebound velocity of hot fly ash particles, using the experimental device in Example 1 to measure the critical rebound velocity when the fly ash particles hit the support platform 14 . The critical velocity is an important parameter in the impact process. When the incident velocity of the particles is lower than the critical velocity, the particles will deposit, resulting in dust accumulation on the heat exchange surface; when the incident velocity of the particles is higher than the critical velocity, the particles will rebound. The specific operation steps are:

[0058] First, adopt the method of Embodiment 2 to carry out the operation of fly ash particles impacting the support platform 14, and calculate the normal incident velocity and normal rebound velocity of the fly ash particles through the high-speed camera 13 to take photos before and after the fly ash particles impact the support platform 14. The meth...

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Abstract

The invention discloses a device and method for measuring a critical rebound speed of a hot fly ash particle and belongs to the field of combustion boiler experimental equipment. Water containing thefly ash particle in the device firstly enters a furnace under the action of a peristaltic pump and high temperature carrying gas, then experiences evaporation and heating processes and an accelerationmovement of a nozzle, and hit a support platform. According to the device and the method, the impact condition of the fly ash particle can be accurately controlled, the movement trajectory of the particle is observed and the impact temperature of the particle is measured separately by using a high-speed camera and an infrared camera at the same time, and finally the critical rebound speed of hotfly ash particle is obtained. According to the device and the method, by controlling the concentration of the fly ash particle in the water, fly ash hits the support platform in the form of a single particle, and the interference caused by the collision of a large number of particles is avoided. According to the device, an impact condition is strictly controlled, the influences of factors of temperature, speed and material on a measurement result can be investigated, and therefore, the critical rebound speed of the fly ash particles is comprehensively studied.

Description

technical field [0001] The invention belongs to the field of combustion boiler experimental equipment, and relates to an experimental device for simulating the collision of fly ash particles in a boiler in a hot state, and more specifically, relates to a critical rebound velocity measuring device and method for hot fly ash particles. Background technique [0002] The boiler is a kind of energy conversion equipment. The energy input to the boiler includes chemical energy and electric energy in the fuel, and the boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of heat energy. The combustion of fuel in the boiler will produce fly ash, especially in my country's power plant boilers, which mainly burn coal, and there is a considerable part of steam coal, which is not high in quality, contains high ash or high alkali metal content, and is easy to burn on the heating surface. Dust or slagging occurs. In order to further understand the depos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P5/00G01N15/00
CPCG01N15/00G01P5/00
Inventor 郑志敏魏建旭楚化强顾明言
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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