A novel spraying/negative-pressure secondary dust suppression device used in fully mechanized mining face: A case study

Nie, Wen; Ma, Xiao; Cheng, Weimin; Liu, Yanghao; Xin, Lin; Peng, Huitian; Wei, Wenle

doi:10.1016/j.psep.2016.07.003

Cited by 110 publications

(18 citation statements)

References 12 publications

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“…Throughout the foreseeable future, coal will still occupy a significant proportion of primary energy in China [1][2][3][4][5]. During the outdoor storage of coal piles and railroad transportation of coal, a large amount of coal dust may be generated, which not only causes the loss of coal and waste of natural resources, but also leads to severe environmental pollution [6][7][8][9][10][11][12]. Besides, as for coal piles, the dust dispersion can adversely impact the normal operation of electric and mechanical equipment as well as the monitoring system, leading to a shortened lifespan.…”

Section: Introductionmentioning

confidence: 99%

Development of Environmental Friendly Dust Suppressant Based on the Modification of Soybean Protein Isolate

Nie

Zhang

et al. 2019

Processes

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Aiming to further improve the dust suppression performance of the dust suppressant, the present study independently develops a new type of biodegradable environmentally-friendly dust suppressant. Specifically, the naturally occurring biodegradable soybean protein isolate (SPI) is selected as the main material, which is subject to an anionic surfactant, i.e., sodium dodecyl sulfonate (SDS) for modification with the presence of additives including carboxymethylcellulose sodium and methanesiliconic acid sodium. As a result, the SDS-SPI cementing dust suppressant is produced. The present study experimentally tests solutions with eight different dust suppressant concentrations under the same experimental condition, so as to evaluate their dust suppression performances. Key metrics considered include water retention capability, cementing power and dust suppression efficiency. The optimal concentration of dust suppressant solution is determined by collectively comparing these metrics. The experiments indicate that the optimal dust suppressant concentration is 3%, at which level the newly developed environmentally-friendly dust suppressant solution exhibits a decent dust suppression characteristic, with the water retention power reaching its peak level, and the corresponding viscosity being 12.96 mPa·s. This performance can generally meet the requirements imposed by coal mines. The peak efficiency of dust suppression can reach 92.13%. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to analyze the dust suppression mechanism of the developed dust suppressant. It was observed that a dense hardened shell formed on the surface of the pulverized coal particles sprayed with the dust suppressant. There is strong cementation between coal dust particles, and the cementation effect is better. This can effectively inhibit the re-entrainment of coal dust and reduce environmental pollution.

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Section: Introductionmentioning

confidence: 99%

Development of Environmental Friendly Dust Suppressant Based on the Modification of Soybean Protein Isolate

Nie

Zhang

et al. 2019

Processes

Self Cite

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“…Although these technologies are simple, dust concentration in the anchoring and shotcreting working face was very high [10]. e total and respirable dust concentrations in some working areas of guniting under the poor condition were up to more than 500 mg/m 3 and 150 mg/m 3 , respectively [11,12]. e high level of silicon dioxide in dust leads to silicosis easily and was harmful to the physical and psychological health of workers.…”

Section: Introductionmentioning

confidence: 99%

Research on Dust Suppression Technology of Shotcrete Based on New Spray Equipment and Process Optimization

Zhou

Chen

et al. 2019

Advances in Civil Engineering

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In order to reduce the dust hazard of shotcrete, the paper analyzed the mechanism of dust production from the perspective of various dust sources and developed the plunger-type wet spraying machinery and wet mixer which can be applied in the small-section tunnel for reducing dust on the root cause. The dust concentration between dry-mix shotcrete and wet-mix shotcrete was compared and analyzed. The results showed that the average total dust concentration and respirable dust concentration in the process of dry spraying were 99.4 mg/m3 and 52 mg/m3, respectively, while 9.8 mg/m3 and 4.08 mg/m3 in the wet-mix shotcrete process, and the average dust concentration decreased by more than 90% after applying new wet-mix shotcrete outfits. The clean zone of dust was divided according to the dust distribution. Finally, the dust suppression technology was optimized by using an accelerator and adjusting wind pressure and spraying angle. Results indicated that the application of the accelerator reduced the dust production efficiently; moreover, when the wind pressure was 0.2 MPa with 1 m spraying distance and 90° angle of spraying, the dust concentration and rebound reached the minimum.

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“…If the air supply demand is configured according to the initial stage of excavation, the wind energy loss will increase as the roadway extended under the specific ventilation scheme and air volume, and the air velocity often fails to meet the requirements of the regulations, which cause the problem of serious dust accumulation. If it is configured according to the maximum demand, the air velocity will be too large in the initial stage of excavation and exceed the specified range, which causes discomfort feelings of workers, secondary blowing dust, and serious pollution at breathing-height area [6][7][8][9]. At present, many researchers have shown that the duct position, diameter, and distance from the duct outlet to heading face have a great influence on the distribution of dust concentration [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Distribution Law and Prediction Model of Dust Concentration under Airflow Adjustment in Fully Mechanized Heading Face

Gong

Jia

Sun

et al. 2019

Mathematical Problems in Engineering

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The current situation of extensive ventilation management for the fully mechanized heading face cannot dynamically control air velocity and make reasonable dust migration distribution, resulting in serious disaster of dust and environmental pollution in the roadway. In this paper, the fluid mechanics, finite element numerical simulation, and underground measurement were combined to analyze the distribution of dust concentration under the variable airflow state at the duct outlet to obtain the massive correlation data of duct outlet parameters and dust concentration. For the pedestrian breathing-height in the backflow side and driver location, the double-objective BP prediction model for dust concentration under airflow adjustment was established, and the performance parameters and prediction accuracy of the BP prediction model were analyzed by using the relative error and fitting analysis. In Ningtiaota coal mine, located in Northern Shaanxi province of China, the self-developed control device is installed on the duct outlet with underground test and application verification to refine the model. The results indicated the dynamic control of airflow optimizes dust concentration distribution. The dust concentration at the pedestrian breathing-height in the backflow side and driver location was significantly decreased after the installation of adjustment device. Dust concentration at the pedestrian breathing-height and driver location was decreased by 31% and 34%, respectively, compared with the results before adjustment, which achieved the safe, environment-friendly, and energy-saving ventilation and the dust removal function in fully mechanized heading face.

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A novel spraying/negative-pressure secondary dust suppression device used in fully mechanized mining face: A case study

Cited by 110 publications

References 12 publications

Development of Environmental Friendly Dust Suppressant Based on the Modification of Soybean Protein Isolate

Development of Environmental Friendly Dust Suppressant Based on the Modification of Soybean Protein Isolate

Research on Dust Suppression Technology of Shotcrete Based on New Spray Equipment and Process Optimization

Distribution Law and Prediction Model of Dust Concentration under Airflow Adjustment in Fully Mechanized Heading Face

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