“…This liquid level height difference is defined as the differential liquid level (DLL) Δ H . Analysis of Δ H results in equation (5) where p0 and p1 are the gas-phase static pressures above the liquid surfaces ahead of and behind the choke, respectively (Pa); p0true¯ and p1true¯ are the means of the static pressures above the liquid surfaces ahead of and behind the choke, respectively (Pa); x 0 and x 1 are the maximal scale of the liquid level at the choke and in the dust removal chamber in the x -direction, respectively (m); dx is the differential unit; and g is the gravitational acceleration (m/s 2 ).…”
Section: The Pressure Drop Of Dust Scrubbersmentioning
confidence: 99%
“…In China, most industrial dust is produced from mining, processing, and utilizing mineral resources. Some of those industries purify their exhaust air using a wet dust scrubber, which is normally used in the following scenarios: The transit point of the belt conveyor (as shown in Figure 1); 1 High humidity work places, such as a mineral crushing workshop; 2,3 Work places with poor environmental conditions and large amounts of dust emissions, such as coal mining faces; 4,5 andOther relatively scattered dust production sources.Figure 1.Self-excited dust scrubber used in the transit point of a belt conveyor.…”
Section: Introductionmentioning
confidence: 99%
“…The transit point of the belt conveyor (as shown in Figure 1); 1 . High humidity work places, such as a mineral crushing workshop; 2,3 . Work places with poor environmental conditions and large amounts of dust emissions, such as coal mining faces; 4,5 and .…”
The complexity of the gas-liquid two-phase flow results in equally complicated pressure drop characteristics for self-excited wet dust scrubbers. In this paper, the pressure drop of the dust scrubber was studied by measuring the total pressure drop R and the differential liquid level Δ H versus the gas velocity v at different initial liquid level b0 values, combined with the liquid flowability. The results showed that the dust scrubber varied its total drag coefficient by changing the differential liquid level Δ H of the liquid-phase and then adjusting the gas-liquid two-phase force balance ahead of and behind the choke. Under the influence of liquid flowability, the throttling strength α exhibited a linear relationship with the gas velocity of the dust scrubber when b0 ≤ 0 mm. The Δ H-v and R- v characteristics of the dust scrubber varied with different values of b0 and v. When b0 > 0, the Δ H-v curve and R- v curve exhibited an explicit quadratic curve relationship. When b0 ≤ 0 mm, the Δ H-v curve and R- v curve exhibited an explicit linear relationship, where the Δ H-v curves can be expressed by a linear equation Δ H = khv+Δ H0, and the gas-phase pressure drop R can be approximately calculated using the differential liquid level Δ H. The liquid flowability can change the choke-sectional to change the total drag coefficient, which reduced in multiple folds with an increase in the gas velocity.
“…This liquid level height difference is defined as the differential liquid level (DLL) Δ H . Analysis of Δ H results in equation (5) where p0 and p1 are the gas-phase static pressures above the liquid surfaces ahead of and behind the choke, respectively (Pa); p0true¯ and p1true¯ are the means of the static pressures above the liquid surfaces ahead of and behind the choke, respectively (Pa); x 0 and x 1 are the maximal scale of the liquid level at the choke and in the dust removal chamber in the x -direction, respectively (m); dx is the differential unit; and g is the gravitational acceleration (m/s 2 ).…”
Section: The Pressure Drop Of Dust Scrubbersmentioning
confidence: 99%
“…In China, most industrial dust is produced from mining, processing, and utilizing mineral resources. Some of those industries purify their exhaust air using a wet dust scrubber, which is normally used in the following scenarios: The transit point of the belt conveyor (as shown in Figure 1); 1 High humidity work places, such as a mineral crushing workshop; 2,3 Work places with poor environmental conditions and large amounts of dust emissions, such as coal mining faces; 4,5 andOther relatively scattered dust production sources.Figure 1.Self-excited dust scrubber used in the transit point of a belt conveyor.…”
Section: Introductionmentioning
confidence: 99%
“…The transit point of the belt conveyor (as shown in Figure 1); 1 . High humidity work places, such as a mineral crushing workshop; 2,3 . Work places with poor environmental conditions and large amounts of dust emissions, such as coal mining faces; 4,5 and .…”
The complexity of the gas-liquid two-phase flow results in equally complicated pressure drop characteristics for self-excited wet dust scrubbers. In this paper, the pressure drop of the dust scrubber was studied by measuring the total pressure drop R and the differential liquid level Δ H versus the gas velocity v at different initial liquid level b0 values, combined with the liquid flowability. The results showed that the dust scrubber varied its total drag coefficient by changing the differential liquid level Δ H of the liquid-phase and then adjusting the gas-liquid two-phase force balance ahead of and behind the choke. Under the influence of liquid flowability, the throttling strength α exhibited a linear relationship with the gas velocity of the dust scrubber when b0 ≤ 0 mm. The Δ H-v and R- v characteristics of the dust scrubber varied with different values of b0 and v. When b0 > 0, the Δ H-v curve and R- v curve exhibited an explicit quadratic curve relationship. When b0 ≤ 0 mm, the Δ H-v curve and R- v curve exhibited an explicit linear relationship, where the Δ H-v curves can be expressed by a linear equation Δ H = khv+Δ H0, and the gas-phase pressure drop R can be approximately calculated using the differential liquid level Δ H. The liquid flowability can change the choke-sectional to change the total drag coefficient, which reduced in multiple folds with an increase in the gas velocity.
“…Furthermore, Yan et al (2016) sought the optimal formula for a dust suppressant through surfactant compounding and applied it to underground mines (Wu et al, 2005), and Wang et al (2015a) used foams for dust prevention in coal mines (Lu et al, 2015). Although these dust suppressants can suppress the dispersion of coal dust effectively, they are not suitable for the open-air environment due to their poor wind resistance and low adhesion ability with regard to dust (Konorev and Nesterenko, 2012;Lu et al, 2015;Wang et al, 2015a). To address this problem, some researchers have also investigated dust prevention and control during the processes of stockpiling and transporting coal in open-cast mines.…”
This paper proposes the development of a novel coagulant for dust suppression in open-cast mines. Specifically, pretreated sodium lignin sulfonate and acrylic acid were first cross-linked, then the graft copolymerization of the intermediate product (the cross-linking product) and acrylamide was conducted and finally the resulting gelatinous substances were crushed. During the reaction process, N,N'-methylene-bis-acrylamide and ammonium persulfate were used as the cross-linking agent and initiator, respectively. Subsequently, the functional groups, crystalline structure, and thermal stability of the dust coagulant were examined by means of Fourier transform infrared spectra measurements, X-ray diffraction spectra measurements, and differential scanning calorimeter analysis. Moreover, single-factor experiments were conducted to explore the optimal synthesis condition. According to the experimental results, the coagulant achieved its optimal dust suppression performance under the following conditions: the mass ratio of lignin to acrylic acid was 1:3, the mass ratio of lignin to acrylamide was 2:7, the content of the cross-linking agent was 0.9%, the mass ratio of initiator to acrylamide was 2:100, the reaction temperature was set as 60 C, and the pH value was set as 7. Finally, the coagulant was measured for its swelling kinetics, viscosity, film-forming hardness, peeling strength, and ability to suppress dust. It can be concluded that the coagulant exhibits a very high standard of both dust suppression and wind resistance.
“…According to incomplete statistics, China has an increase of pneumoconiosis cases in excess of 20 000. In 2015 alone, 11 396 cases of pneumoconiosis were reported in China's coal mines …”
BACKGROUND: Coal dust is a major byproduct generated during coal mining production. The diffusion of coal dust not only causes severe environmental pollution, but also poses a serious threat to miners' health. How to provide effective control over coal dust remains one of the key topics of coal mine occupational safety research.
RESULTS:The present study is focused on the preparation of an environmentally-friendly cementing agent applicable to the transportation, stacking and storage of coal. The product is characterized by a combination of infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), simultaneous thermal analyzer (TGA-DSC)and scanning electron microscopy (SEM) so as to analyze the microscopic reaction and structure of the product; single factor experiments focusing on the peeling strength are carried out to determine the optimal synthesis condition.
CONCLUSION:A study on the characteristics of the cementing agent produced indicates that it has an effective dust suppression capability and extreme resistance against unfavorable application conditions.
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