Experimental investigation of the pressure gradient of a new spiral mesh foam generator

• Published in: Process safety and environmental protection Vol. 94; pp. 44 - 54
• Main Authors: Lu, Xinxiao, Wang, Deming, Shen, Wei, Wang, Hetang, Zhu, Chaobing, Liu, Jianan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2015
• Subjects: Air flow rate; Coal mines; Dust; Foam; Foaming; Foams; Generators; Mesh generation; Pressure gradient; Pressure gradients; Spiral mesh; Spirals; Spiral mesh; Dust; Pressure gradient; Air flow rate; Foam
• ISSN: 0957-5820; 1744-3598
• DOI: 10.1016/j.psep.2014.12.002

•An original design of spiral mesh foam generator is proposed.•There is a large pressure gradient gap between the top and bottom at both ends of the foam generator.•The foam flow increases sharply when the pressure gradient is higher than a critical value.•The new foam generator has a stronger foaming ability and less pressure loss. Foam is used as part of an effective dust suppression method in underground coal mines, but conventional foaming devices severely restrict its popularization and application due to the high cost of foam preparation, poor applicability and high pressure loss. Therefore, a new spiral mesh foam generator is designed, and its performance is investigated and evaluated experimentally. The results show that the pressure gradient of the spiral mesh foam generator increases with the increase of foam concentration in water. There is a large pressure gradient gap between the top and bottom at both ends of the foam generator. However, the gap disappears and uniform foam is generated in the middle section of the foam generator. When the pressure gradient is higher than minimum pressure gradient, the foam production quantity will increase sharply. Based on the length of spiral mesh and operating conditions determined, the new foam generator is applied to produce foam for dust suppression in the heading face of coal mines. A good foaming effect, less pressure loss and high dust suppression efficiency suggest that the new foam generator will greatly promote the large-scale application of foam technology used to suppress dust in underground coal mines.