Abstract
This article proposes a design and experimental method of a new inner-rotation nozzle. First, the design model of the inner-rotation nozzle was established based on Abramovich’s maximum flow principle and high-pressure water jet crushing theory. Considering the specific conditions of the negative pressure duster, the reference values of nozzle structure parameters are calculated. The simulation is conducted for studying the relationship between the nozzle’s structure parameters and its performance including water flow velocity at nozzle outlet, atomization effects, and so on. By orthogonal experiment, the reasonable nozzle structure parameters were obtained by analyzing the speed of flow, the amount of air, and so on. Then, a series of nozzles were machined with different size shells and cores. In order to select out the optimum matching of nozzle cores and shells, an experimental system is established. Considering the installation location, wind speed, liquid–gas ratio, and other factors, the optimum matching of the shell core was chosen. At the same time, the application test of the negative pressure duster was carried out on the fully mechanized mining face. The research results show that the removal rate of pulverized coal has a higher improvement, and provides a theoretical basis for the design of negative pressure duster.
Highlights
Coal mine dust is one of the five major disasters in coal mines
The wet negative pressure duster mentioned in this article uses the high-pressure water jet to form negative pressure in the ejector cylinder, to suck the dusty air outside and combine it with high-pressure water jet in the ejector cylinder to achieve the function of dust removal
If B2 is selected, it can be concluded from Table 4 that the axial average speed is 22.4% higher than B1, the tangential average speed is reduced by 10.2% and the mass rate is reduced by 40.6 %, so the diameter of the through-hole is 1.2 mm
Summary
Coal mine dust is one of the five major disasters in coal mines. In recent years, coal mine dust control and prevention of pneumoconiosis have attracted people’s attention.[1]. The influence of the nozzle outlet diameter is small among the tangential average velocity and the air flow rate, but the maximum value is obtained at 1.5 mm, so it is reasonable to be selected to 1.5 mm It is crag-fast to find the best level because the diameter of through-holes affects the size of each indicator in the middle level. According to the orthogonal simulation experiment, the optimal combination of nozzle sizes is A3 B1 C1 D3, that is, the spiral groove depth is 2.5 mm, the through-hole diameter is 1.2 mm, the nozzle outlet diameter is 1.5 mm, and the inlet pressure is 15 MPa. The dust removal rate in the table is calculated as follows h1
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