Experimental investigations on the performance of a new design of foaming agent adding device used for dust control in underground coal mines

Wang, Hetang; Wang, Deming; Lu, Xinxiao; Qing-Cong, Gao; Ren, Wanxing; Zhang, Yikun

doi:10.1016/j.jlp.2012.07.023

Cited by 62 publications

(15 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the outlet pressure P 2 of the double-stage parallel adding equipment increases, causing the pressure loss (P 1 − P 2 ) to decline. This characteristic is just what the parallel-type device, proposed by Wang [6], does not have. The third one is that adding proportion q * of the double stage is reduced concluded from Sect.…”

Section: Relationship Between Pressure Loss ( P) and Watermentioning

confidence: 90%

“…Lots of scholars and research institutions have studied on this technology [4,5]. However, the further development and application of DSF were severely restricted due to the high adding proportion of foaming agent and system complexity in past decades [6].…”

Section: Introductionmentioning

confidence: 99%

“…Actually, the structure parameters of jet equipment are hardly determined in underground coal mines due to the unstable working condition of water pressure and water flow, and there exists no universal jet equipment design. For the purpose of reducing cavitation, lowering inlet pressure and reducing loss of the single-stage jet equipment, researchers [6,17,18] designed parallel-type jet equipment. The structure of them was that the single-stage jet device and the adjusting valve were set in two branches.…”

Section: Introductionmentioning

confidence: 99%

“…The structure of them was that the single-stage jet device and the adjusting valve were set in two branches. Experimental investigations showed that this equipment can reduce the adding proportion of foaming agent to 0.5-1.0 % [6], which significantly reduced the cost of controlling dust with foam. However, there is no substantial progress in raising the device' pressure ratio due to lack of pressure compensation, which restricts its wide application in DSF because strong driving pressure is in need at times.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A New Design of Double-Stage Parallel Adding Equipment Used for Dust Suppression in Underground Coal Mines

Wang

Shen

et al. 2014

Arab J Sci Eng

Self Cite

View full text Add to dashboard Cite

In order to solve the problems of conventional single-stage adding equipment, such as high adding proportion, easy to generate cavitation, large pressure loss and low pressure ratio, an original design of double-stage parallel adding equipment is proposed. Its performance is investigated experimentally under different working flow and outlet pressure and compared with the single-stage jet equipment. Testing results show that the adding proportion of doublestage parallel adding equipment is less than that of the singlestage one, and the cavitation flow is higher. The new equipment can decrease pressure loss, inlet pressure and improve pressure ratio, which lowers the energy loss of adding equipment and raises its driving ability in application. An adding proportion of 4.6 0 / 00 and an outlet pressure of 0.16-0.18 MPa were realized when the double-stage parallel adding equipment was used to add foaming agent for dust suppression with foam (DSF). The marked reduction in the adding proportion of foaming agent significantly reduces foam production cost. Therefore, it is believed that the study would lay an important foundation for the widespread application of DSF in underground coal mines.

show abstract

Section: Relationship Between Pressure Loss ( P) and Watermentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Design of Double-Stage Parallel Adding Equipment Used for Dust Suppression in Underground Coal Mines

Wang

Shen

et al. 2014

Arab J Sci Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although airatomizing sprays are reported to be the most effective in airborne dust capture, their utilization is limited due to high maintenance requirements [7]. More recently, Wang, et al [11][12] have stated that foam technology is more efficient than water spraying for dust control in coal mines because it distributes moisture much more evenly over a large contact area on dust particles, improving the wetting and adhesion ability.…”

Section: Introductionmentioning

confidence: 99%

Development of a Respirable Dust Mitigation System for a High Longwall Face at Sihe Colliery in China â a Case Study

Wang

Tang

et al. 2017

J. Eng. Technol. Sci.

View full text Add to dashboard Cite

Abstract. Dust is a major hazard in underground coal mines that threatens the work health and safety of coal miners. The dust issue becomes increasingly significant with the development of highly mechanized coal mining. This issue is particularly serious at the high longwall faces of the Sihe colliery in China as the concentration of dust, in particular respirable dust, at these faces far exceeds the regulatory dust limits. Field testing and computational fluid dynamics (CFD) simulations were conducted to understand the sources of dust generation and its dynamic movement in the #5301 longwall face of high-cutting height at the colliery. The investigation results showed that shearer generated dust was minimal during the coal cutting operation; that face spalling and chock movement were the main dust generating sources, causing significant contamination to the walkway; and that the majority of dust particles from the face (regardless of source) eventually disperse into the main gate, where the dust concentration was greater than 500 mg/m 3 . These findings were used to develop an effective coal dust mitigation system involving the installation of dust scrubbers, curtains, and venture and crescent sprays. The results of CFD modeling indicate that the dust concentration could be significantly reduced by adopting the new dust mitigation system.

show abstract

A venturi device for stable addition of foaming agent to self‐suction liquid at high flow rates

Lu,

Wu,

Chen

et al. 2024

Engineering Reports

View full text Add to dashboard Cite

To achieve a stable addition of foaming agent under high flow rates, an independently designed venturi structure with self‐suction of liquid to add foaming agent was numerically simulated. We simulated the effects of different self‐suction liquid structures' diameters (diameter of the tube in which the liquid is sucked in), contraction angles, throat length, and position on the suction liquid ratio (ratio of venturi self‐suction liquid flow rate to total flow rate), compared and analyzed the data, and determined the optimal self‐suction liquid structures parameters. The suction liquid ratio shows a tendency to first stabilize and then decrease as the outlet pressure increases. When the outlet pressure in range of 0.30–0.45 MPa, the suction liquid ratio remains stable at 1.14%. However, as the outlet pressure increases, the ability of the venturi structure to add foaming agent through the self‐suction liquid decreases under high flow rates, causing the suction liquid ratio to rapidly decrease to a minimum value of 0.60 MPa. We have conducted a detailed analysis of the process and flow field of suction liquid. As the outlet pressure increases, the high‐speed area of the throat gradually shrinks, and the flow field in the diffusion section fluctuates. When the outlet pressure is 0.6 MPa and the velocity field shifts toward the upper part of the diffusion section, the cavitation area will gradually disappear and lose its liquid suction ability.

show abstract

Experimental investigations on the performance of a new design of foaming agent adding device used for dust control in underground coal mines

Cited by 62 publications

References 2 publications

A New Design of Double-Stage Parallel Adding Equipment Used for Dust Suppression in Underground Coal Mines

A New Design of Double-Stage Parallel Adding Equipment Used for Dust Suppression in Underground Coal Mines

Development of a Respirable Dust Mitigation System for a High Longwall Face at Sihe Colliery in China â a Case Study

A venturi device for stable addition of foaming agent to self‐suction liquid at high flow rates

Contact Info

Product

Resources

About

Experimental investigations on the performance of a new design of foaming agent adding device used for dust control in underground coal mines

Cited by 62 publications

References 2 publications

A New Design of Double-Stage Parallel Adding Equipment Used for Dust Suppression in Underground Coal Mines

A New Design of Double-Stage Parallel Adding Equipment Used for Dust Suppression in Underground Coal Mines

Development of a Respirable Dust Mitigation System for a High Longwall Face at Sihe Colliery in China â a Case Study

A venturi device for stable addition of foaming agent to self‐suction liquid at high flow rates

Contact Info

Product

Resources

About

Development of a Respirable Dust Mitigation System for a High Longwall Face at Sihe Colliery in China â a Case Study