Abstract
Intense axial vibration of the paste and the reversed flow make damage to the transportation system and lag the transport progress. This paper analyzed the axial vibration of the paste by building the vibration model according to the working situations of the system. The amount of the reversed flow share is then estimated based on the formed axial vibration model. The estimation of the reversed flow is carried out by counting the amount of the decompressed paste in certain time, which is being relative to the displacement in a single process of the vibration in numerical. The estimation of the reversed flow share of coal slime paste under certain transportation conditions was given and compared with the result based on the wave velocity method. It is evident that the introduction of axial vibration model into the study of the pipeline transportation system is feasible and reasonable, which also supplements the theoretical foundation for the analysis of dense paste vibrations in pipeline transportation system and its impacts on the system.
Highlights
The concerns on the use of the high density, thickened tailings in mining industry have been enhanced significantly recently
This paper aims to study the axial vibration of the body of dense paste and to analyze the amount of reversed flow
When dense pastes are transported in pipeline steadily during a certain piston travel, the axial pressure equals the radial pressure [14], which enables the pastes to be regarded as linear elastic body
Summary
The concerns on the use of the high density, thickened tailings in mining industry have been enhanced significantly recently These tailings and other similar wastes or byproducts in industry are referred to as “dense paste” in this paper to present a sort of material that consists of high solid contents and thin grain, showing high viscosity with a state of somehow between solid and fluid. In China, approximately 63.9 million tons of coal slime had been sent to CFB (Circulating Fluidized Bed) boilers as a partial substitution of coal fuel from 2002 to 2008, resulting in an economic benefit of about 10.1 billion CNY [6] Under this background, how to transport those huge amounts of dense paste in different disposals is one of the fundamental engineering problems. The transportation distance along the pipelines is often near or over 1000 m; the used pipelines often have the diameters up to 300 mm; and the maximum pumping pressure in the system is up to 20 MPa [5]
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