MTW European Type Trapezium Mill
Input size:30-50mm
Capacity: 3-50t/h
LM Vertical Roller Mill
Input size:38-65mm
Capacity: 13-70t/h
Raymond Mill
Input size:20-30mm
Capacity: 0.8-9.5t/h
Sand powder vertical mill
Input size:30-55mm
Capacity: 30-900t/h
LUM series superfine vertical roller grinding mill
Input size:10-20mm
Capacity: 5-18t/h
MW Micro Powder Mill
Input size:≤20mm
Capacity: 0.5-12t/h
LM Vertical Slag Mill
Input size:38-65mm
Capacity: 7-100t/h
LM Vertical Coal Mill
Input size:≤50mm
Capacity: 5-100t/h
TGM Trapezium Mill
Input size:25-40mm
Capacity: 3-36t/h
MB5X Pendulum Roller Grinding Mill
Input size:25-55mm
Capacity: 4-100t/h
Straight-Through Centrifugal Mill
Input size:30-40mm
Capacity: 15-45t/h
Recovery coefficient between coal
Coupled coal–gas interaction during CBM and CO2ECBM
2022年11月17日 Coupled coal–gas interaction in coal seams is crucial to the efficient recovery of Coalbed methane (CBM), and carbon dioxideenhanced CBM (CO2ECBM) Coal is In this study, the friction coefficient of coal was determined using a selfmade testing instrument for measuring the static friction coefficient and an automatic cylinder lifting device onDetermination of the friction coefficient of coal particles by 2023年12月1日 The results showed that both CO 2 flow rate and CO 2 cumulative storage volume decreased with increased permeability rebound and recovery time Inspired by the Effects of coal permeability rebound and recovery phenomenon 2024年6月20日 To better capture the changes that occur during the extraction of CBM, the internal swelling coefficient of matrix (ISCM) has been gradually in permeability introduced into A review of coal permeability models including the internal
Numerical simulation of CO2ECBM for deep coal reservoir with
2024年8月15日 CH4 production rate of coalbed methane (CBM) well decreases rapidly during primary recovery in the deeply buried coal seam, resulting in a lot of CH4 residues CO2 pour 2020年2月13日 Here, the performance analysis of both CO 2 storage and ECBM recovery process in coal matrixes is investigated based on the numerical simulationA study on the carbon dioxide injection into coal seam 2016年10月17日 Thermal extraction yields were obtained for 13 coals in supercritical ethanol at 250°C The direct and indirect relationships between extraction yield and coal properties were Correlation and path coefficient analysis between thermal 2010年10月1日 In the first stage, recoveries (1, 2, 3, 5 and 8 min of flotation times) of Jameson flotation operating parameters were fitted to firstorder kinetic model, R = R∞ [1 − exp (− kt)] Coal flotation optimization using modified flotation parameters
Strength Restoration of Cracked Sandstone and Coal under a
2015年12月29日 The restoration effects of coal are considerably better than those of sandstone because the strength recovery coefficient of the former is 120, whereas that of the latter is 2022年3月1日 A large amount of wasteheat resources, including exhaust, cooling water, and sewage, are generated in production and manufacturing [19]Disadvantageously, the singlestage WHR system is difficult to effectively deal with these wasteheat, therefore, the multistage system is gradually on the stage in the WHR field [20]A compact dualloop organic Rankine cycle A novel and efficient cogeneration system of waste heat recovery 2017年9月5日 The empirical model developed for the settling rate indicated a coefficient of correlation (R²) of 099 between the experimental and predicted values Particle size distribution of coal Water (PDF) Dewatering performance of coal fines refuse 2017年5月15日 Although the production mechanism of CO 2enhanced coalbed methane (ECBM) recovery has been previously reported and corresponding models have been proposed, investigations on the effect of the injection pressure on the production efficiency considering the mass transfer between the coal fracture and matrix are lackingIn this study, laboratory core Impact of injection pressure on CO2–enhanced coalbed methane recovery
Efficient recovery of phenol from coal tar processing wastewater
2020年5月1日 As the main phenolic component in the wastewater is phenol, and the extraction order is cresol > phenol in general (Teramoto et al, 1983; Youyuan et al, 2008), the extraction difficulty of sodium sulfate wastewater lies in the recovery of phenol in wastewaterFurthermore, to eliminate the interference of phenolic derivatives, phenol was chosen as the targeted pollutant 2015年7月8日 Previous research indicates that coal and coal byproducts are a potential source of critical elements including rare earth elements (REE) with estimated amounts in the range of 50 million metric A Review of the Occurrence and Promising Recovery Methods 2023年5月1日 From the various relationships between the diffusion coefficients of the two gases, it can be shown that the diffusion coefficient of CH 4 reduces faster at lower pressure This confirms the experimental results of Charrière et al [64] that the diffusion coefficients of both CO 2 and CH 4 are pressuredependent and that CH 4 is more sensitive to pressure than is CO 2 Modelling multicomponent gas diffusion and predicting the 2016年2月1日 CO 2 enhanced coalbed methane recovery (CO 2ECBM) project has become the most promising method for carbon sequestration and natural gas recoveryThe diffusion properties of carbon dioxide (CO 2) and methane (CH 4) in coal lie at the heart for the projectQuantitatively understanding the diffusion, especially the transport diffusion in Molecular simulation of CO2/CH4 self and transport diffusion
Experimental study on methane adsorption and timedependent
2021年12月1日 Based on the comparison of the diffusion coefficients between coal SJZY and coal SJZR presented in Section 41, the tectonic coal was found to have a greater D 0, resulting in higher CO 2 injection and methane extraction pressure difference for tectonic coals compared with the intact coal in the early stage of CO 2ECBM project implementation, as presented in The distribution and enrichment characteristics of rare earth elements between coals recommends that coalbased materials with a concentration higher than 300 μg g −1 can be used as raw materials for REY recovery 9 Coal mines the REY in the coal of P4 power plant are obviously enriched In the enrichment coefficients of coal The distribution and enrichment characteristics of rare earth At present, the research on the migration rule of top coal pays attention to the fragmentation degrees of top coal, but not much to the roof condition The lack of clarity on the law of top coal top plate coupling action leads to the lack of a consensus and theoretical, quantitative expression of the law of top coal transportation in header mining, which is also an important reason for the Study on the influence of coal recovery rate under the mutual 2020年11月1日 The presence of water in coal matrices could cause capillary force and consequently affect gas production In this work, an integrated experimental and numerical modelling approach was adopted to quantify the impact of capillary trapping on coal seam gas (CSG) recovery The experimental work was to gain the change rule of contact angle with Quantifying the impact of capillary trapping on coal seam gas recovery
Effects of coal permeability rebound and recovery phenomenon
2023年12月1日 This is because the increase in coal seam temperature may damage some of the properties of the coalbed, leading to a sharp decline in the lowest permeability value, even causing the closure of coal fractures (Fig 12), which leads to a decrease in the recovery properties of coal permeability and the appearance of prolonged recovery time or non 2024年10月15日 CO 2 fugacity coefficient and the pressure of the relationship between the existence of sudden changes, 27315 K, 28315 K, 29315 K fugacity coefficient curve gradient there is a sudden change Molecular simulation study of adsorptiondiffusion of CH2018年9月10日 For backfill mining, the efficiency of filling production is too low; it would take 12 years to recover the coal of the working district no 7 For strip mining, although the coal recovery coefficient is relatively low, approximately 50%, the economic benefits are the highest due to less investment needed compared to moving and backfill miningA study of surface subsidence and coal pillar safety for strip 2021年12月15日 Scrubbers are more and more used to recover waste heat from coalfired exhaust flue gas (EFG) But the heat and mass transfer mechanism in the counter flow direct contact scrubber is not clear enough, and the heat recovery rate (E) needs to be improved cost effectivelyThis paper proposes to use a simulation model to study the heat and mass transfer Waste heat recovery mechanism for coalfired flue gas in a
Relative Permeability of Coal: A Review Transport in Springer
2014年12月6日 Coalbed methane (CBM), once a hazard to the undermining safety, is becoming an important addition to the global energy supply Injecting carbon dioxide $$(\\hbox {CO}{2})$$ ( CO 2 ) into coal seams not only aids to enhance CBM production but also offers an option of $$\\hbox {CO}{2}$$ CO 2 sequestration helpful for the reduction of greenhouse gas release Download scientific diagram Concentration coefficient (CC, average concentration of element in coal sample investigated vs average of corresponding element in world hard coals) of trace Concentration coefficient (CC, average concentration of element in coal 2022年7月24日 The diffusion of methane (CH4) from coal, which is a crucial factor affecting the production of coalbed methane, exhibits dependence on pore structure In the present study, the effects of pore structure of different coal ranks on the diffusion coefficient of CH4 from coals were investigated The CO2 sorption, CH4 isotherm sorption and desorption experiments as well as Relationship Between Micropore Structure of Different Coal 2016年9月15日 Four different coal samples were studied against the temperature influence on methane storage as well as its transport inside the pores It is found that a change in temperature, for eg ΔT ∼ 40 °C, may be expected to cause a three to four fold improvement in diffusivityThe experimental data was utilized in theoretical simulation of coal seam bedInvestigation of thermal stimulation of coal seam gas fields for
The distribution and enrichment characteristics of rare earth
The distribution and enrichment characteristics of rare earth elements between coals and coal ashes from four coalfired power plants Guoqiang Wu * a, Zhanlong Ma bc, Guosheng Li de and Chunmiao Bo a a School of Chemistry and Chemical Engineering, Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, Ningxia Key Laboratory of 2020年2月13日 The value of coal permeability has been chosen between 1 and 10 mD to match for coal beds For a sorption time constant \(\tau = 1/k{\text{mi}}\) of around 15 days, a coefficient of mass transfer has been A study on the carbon dioxide injection into coal 2024年5月4日 To improve the efficiency of coalbed methane and recoverability of reservoirs, enhanced fracturing technology is usually required to improve the low porosity and permeability status of coal reservoirs As a feasible method for strengthening permeability, microwave–LN2 freeze–thaw (MLFT) cycles modify the microscopic pore structure of coal through the coupled Modification of Microstructural and Fluid Migration of Bituminous Coal 2021年12月1日 CO 2enhanced coalbed methane (CO 2ECBM) technology can be applied not only to extract coal seam gas, but also to geologically store a large amount of CO 2 produced in various industries, thus reducing the CO 2 concentration in the atmosphere and protecting the earth’s environment from the adverse effects of climate changeFor CO 2 injection and Experimental study on methane adsorption and timedependent
Investigation on the influence of the macropores in coal on CBM recovery
2023年9月1日 As an important component of coal structure, the macropores have a great influence on CBM recovery In this paper, the macropores characteristic of two coal samples collected from 3 # coal seam in the south of Qinshui Basin, China was analyzed on the basic of mercury intrusion porosimetry, and a fully coupled tripleporosity/double permeability 2024年10月29日 For the mining work of endpressed coal in openpit mines, the space at the bottom of the pit is usually used to recover the compressed coal seams 19In the same way, this method is also used to Recovery of compaction resources in internal dump of gently 2022年11月1日 When the researchers investigated the correlation coefficient between rare earths and ash yield, In 2013, Fecko (2013) reported typical hard coal recovery processes would generate 40 % of waste materials By applying the same percentage to historic United States hard coal production of 353 Bt of clean coal, A review study of rare Earth, Cobalt, Lithium, and Manganese in Coal 2024年1月16日 Coal and coal ash (slag and fly ash) have emerged as important potential sources for rare earth elements (REY) The distribution and enrichment of REY during coal combustion from coalfired power (PDF) The distribution and enrichment characteristics of rare earth
Effect of the effective stress coefficient and sorptioninduced
2011年9月1日 Coal seam permeability is widely accepted as the most important factor for assessing the economic feasibility of (CO 2 ) enhanced coalbed methane (ECBM) recovery, playing a significant role in 2023年2月23日 This paper uses PFC2D software to carry out DEM numerical simulations of coal caving, calculates the top coal recovery under the same coal seam thickness and different rock layer thicknesses, analyzes the influence of the rock layer thickness on the top coal caving law in two different stages, and explains the necessity of a thick rock layer and the optimal thickness Influence of loose gangue thickness on top coal recovery ratio in 2016年1月1日 The wide range of variability of methane diffusion coefficient values for coal, between 10 −11 cm 2 /s and 5 × 10 −7 cm 2 /s [36] allows coal types to be differentiated in terms of the The coalgas system The effective diffusion coefficient2022年3月1日 A large amount of wasteheat resources, including exhaust, cooling water, and sewage, are generated in production and manufacturing [19]Disadvantageously, the singlestage WHR system is difficult to effectively deal with these wasteheat, therefore, the multistage system is gradually on the stage in the WHR field [20]A compact dualloop organic Rankine cycle A novel and efficient cogeneration system of waste heat recovery
(PDF) Dewatering performance of coal fines refuse
2017年9月5日 The empirical model developed for the settling rate indicated a coefficient of correlation (R²) of 099 between the experimental and predicted values Particle size distribution of coal Water 2017年5月15日 Although the production mechanism of CO 2enhanced coalbed methane (ECBM) recovery has been previously reported and corresponding models have been proposed, investigations on the effect of the injection pressure on the production efficiency considering the mass transfer between the coal fracture and matrix are lackingIn this study, laboratory core Impact of injection pressure on CO2–enhanced coalbed methane recovery 2020年5月1日 As the main phenolic component in the wastewater is phenol, and the extraction order is cresol > phenol in general (Teramoto et al, 1983; Youyuan et al, 2008), the extraction difficulty of sodium sulfate wastewater lies in the recovery of phenol in wastewaterFurthermore, to eliminate the interference of phenolic derivatives, phenol was chosen as the targeted pollutant Efficient recovery of phenol from coal tar processing wastewater 2015年7月8日 Previous research indicates that coal and coal byproducts are a potential source of critical elements including rare earth elements (REE) with estimated amounts in the range of 50 million metric A Review of the Occurrence and Promising Recovery Methods
Modelling multicomponent gas diffusion and predicting the
2023年5月1日 From the various relationships between the diffusion coefficients of the two gases, it can be shown that the diffusion coefficient of CH 4 reduces faster at lower pressure This confirms the experimental results of Charrière et al [64] that the diffusion coefficients of both CO 2 and CH 4 are pressuredependent and that CH 4 is more sensitive to pressure than is CO 2 2016年2月1日 CO 2 enhanced coalbed methane recovery (CO 2ECBM) project has become the most promising method for carbon sequestration and natural gas recoveryThe diffusion properties of carbon dioxide (CO 2) and methane (CH 4) in coal lie at the heart for the projectQuantitatively understanding the diffusion, especially the transport diffusion in Molecular simulation of CO2/CH4 self and transport diffusion 2021年12月1日 Based on the comparison of the diffusion coefficients between coal SJZY and coal SJZR presented in Section 41, the tectonic coal was found to have a greater D 0, resulting in higher CO 2 injection and methane extraction pressure difference for tectonic coals compared with the intact coal in the early stage of CO 2ECBM project implementation, as presented in Experimental study on methane adsorption and timedependent The distribution and enrichment characteristics of rare earth elements between coals recommends that coalbased materials with a concentration higher than 300 μg g −1 can be used as raw materials for REY recovery 9 Coal mines the REY in the coal of P4 power plant are obviously enriched In the enrichment coefficients of coal The distribution and enrichment characteristics of rare earth
Study on the influence of coal recovery rate under the mutual
At present, the research on the migration rule of top coal pays attention to the fragmentation degrees of top coal, but not much to the roof condition The lack of clarity on the law of top coal top plate coupling action leads to the lack of a consensus and theoretical, quantitative expression of the law of top coal transportation in header mining, which is also an important reason for the