Needle penetration measurement device and method for characterizing rheological behaviour of high-viscosity solid fuel ash

Abstract

The invention relates to a needle penetration measurement device and method for characterizing rheological behaviour of high-viscosity solid fuel ash, belonging to the technical field of material rheological behaviour measurement. The rheological behaviour of the solid fuel ash is mainly characterized by adopting meltbility and viscosity concepts, the traditional measurement method is difficult to quantify to obtain an accurate rheological behaviour measurement result aiming at high-viscosity ash, which brings the difficulty for analyzing an ash bonding process. The method comprises the stepsof: firstly, melting solid fuel ash particles, then reducing the temperature to reach the measured temperature, and then inserting a measurement standard needle to reach the depth of an ash sample obtain a needle penetration value under the temperature and the standard needle penetration time for characterizing the rheological behaviour of the high-viscosity ash. By adopting the measurement method, the needle penetration parameter for characterizing the rheological behaviour of the high-viscosity ash is obtained, the traditional ash meltbility and the ash viscosity are replenished and completed, more characteristics of a slag layer can be reflected, the slag-bonding microscopic mechanism of the high-viscosity ash is obtained, thus the basis data is provided for the slag-bonding process analysis of the solid fuel ash.

Description

technical field [0001] The invention relates to a method and a device for measuring the rheology of solid fuel ash, and belongs to the technical field of material rheology measurement. Background technique [0002] Solid fuel ash slagging is a common engineering problem encountered in the process of coal and biomass solid fuel combustion or gasification utilization, and is an important factor affecting the normal operation of related industrial processes. The slagging process of solid fuel ash is mainly affected by its own rheological properties. At present, the characterization of the rheological properties of solid fuel ash is mainly described by the concepts of melting and viscosity. For high-viscosity solid fuel ash, such as solid fuel ash whose temperature is lower than the ash flow temperature, the surface viscosity is significantly higher than the ash viscosity higher than the flow temperature. Existing measurement methods cannot quantitatively obtain accurate rheolo...

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Problems solved by technology

The existing slagging model mainly uses the ash viscosity value to judge. For high-viscosity solid fuel ash, it is difficult to characterize the viscosity, which greatly affects the accuracy of prediction. It is urgent to propose new parameters and parameters to characterize the rheological properties of high-viscosity solid fuel ash. Corresponding measurement methods to make up for the lack of existing research, while laying the foundation for quantitative and accurate prediction of slagging

[0006] Similarly, the melting of ash is characterized by three characteristic temperatures, which are only three isolated temperature points, which can only indirectly reflect the rheology of ash before the softening point, and lack a quantitative parameter

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