Experimental Study on the Characteristics of Aeolian Sand Paste-Like Stowing Material in Coal Mine

2014 ◽  
Vol 962-965 ◽  
pp. 1020-1024
Author(s):  
Kai Hua Sun ◽  
Rui Zhang
Keyword(s):  
Experimental Study ◽  
Reaction Mechanism ◽  
Coal Mine ◽  
Aeolian Sand ◽  
Material Density ◽  
Stowing Material ◽  
Series Of Experiments ◽  
Auxiliary Material ◽  
Main Components ◽  
The Cost

In order to reduce the cost of stowing materials in Yuyang coal mine, and localize the stowing material, a series of experiments were conducted, which were based on the sampling and testing of aeolian sand to analyze the reaction mechanism of paste-like stowing slurry. The influence of different aeolian sand and auxiliary material content on stowing material was also studied in the experiment. Experimental results indicate that the main components of aeolian sand are SiO2 and Al2O3. The stowing material density increases by 23.4% with more aeolian sand additive amount, and the material cost falls to 93 yuan/m3, reduced by 25.6%. With the increase of auxiliary gelatinization material dosage, the 28-day strength of material increases by 59.4%, the hardening rate of stowing material reaches up to 109.5%, increased by 23%, and the stowing material shows micro expansion.

Discuss about Stowing Material for Coal Mine

2014 ◽  
Vol 962-965 ◽  
pp. 910-913
Author(s):  
Xue Ling Du
Keyword(s):  
Environmental Protection ◽  
Chemical Reaction ◽  
Coal Mine ◽  
Environmentally Friendly ◽  
Natural Material ◽  
Harmonious Development ◽  
First Choice ◽  
Stowing Material ◽  
The Cost

Mining with stowing is an environmentally friendly way for coal mine, and stowing material is the key to realize environmental protection and harmonious development. This paper focused on the stowing materials, and evaluation for the stowing material would be made. Stowing materials could be sorted as chemical reaction material, solid refuses from coal mine and natural material for stowing. In the light of the cost and sustainable application of the stowing material, we suggest solid refuses from coal mine are the first choice as stowing materials for now.Urban pollutants could be a good kind of stowing materials, but further study should be made for this material. Also the stowing materials should be as cheap and environmentally friendly as they could.

Exergoeconomic analysis of renewable multi-generation system

2020 ◽  
pp. 99-111
Author(s):  
Vontas Alfenny Nahan ◽  
Audrius Bagdanavicius ◽  
Andrew McMullan
Keyword(s):  
Capital Investment ◽  
Combined Cycle ◽  
Asian Countries ◽  
Generation System ◽  
Integrated Gasification Combined Cycle ◽  
Heating And Cooling ◽  
Integrated Gasification ◽  
Exergoeconomic Analysis ◽  
Main Components ◽  
The Cost

In this study a new multi-generation system which generates power (electricity), thermal energy (heating and cooling) and ash for agricultural needs has been developed and analysed. The system consists of a Biomass Integrated Gasification Combined Cycle (BIGCC) and an absorption chiller system. The system generates about 3.4 MW electricity, 4.9 MW of heat, 88 kW of cooling and 90 kg/h of ash. The multi-generation system has been modelled using Cycle Tempo and EES. Energy, exergy and exergoeconomic analysis of this system had been conducted and exergy costs have been calculated. The exergoeconomic study shows that gasifier, combustor, and Heat Recovery Steam Generator are the main components where the total cost rates are the highest. Exergoeconomic variables such as relative cost difference (r) and exergoeconomic factor (f) have also been calculated. Exergoeconomic factor of evaporator, combustor and condenser are 1.3%, 0.7% and 0.9%, respectively, which is considered very low, indicates that the capital cost rates are much lower than the exergy destruction cost rates. It implies that the improvement of these components could be achieved by increasing the capital investment. The exergy cost of electricity produced in the gas turbine and steam turbine is 0.1050 £/kWh and 0.1627 £/kWh, respectively. The cost of ash is 0.0031 £/kg. In some Asian countries, such as Indonesia, ash could be used as fertilizer for agriculture. Heat exergy cost is 0.0619 £/kWh for gasifier and 0.3972 £/kWh for condenser in the BIGCC system. In the AC system, the exergy cost of the heat in the condenser and absorber is about 0.2956 £/kWh and 0.5636 £/kWh, respectively. The exergy cost of cooling in the AC system is 0.4706 £/kWh. This study shows that exergoeconomic analysis is powerful tool for assessing the costs of products.

EXPERIMENTAL STUDY OF REACTION OF ETHANOL WITH OXYGEN BEHIND SHOCK WAVES USING ATOMIC RESONANCE ABSORPTION SPECTROSCOPY METHOD

2020 ◽  
Author(s):  
N. S. Bystrov ◽  
◽  
A. V. Emelianov ◽  
A. V. Eremin ◽  
P. I. Yatsenko ◽  
...  
Keyword(s):  
Experimental Study ◽  
Shock Waves ◽  
Absorption Spectroscopy ◽  
Vacuum Ultraviolet ◽  
Resonance Absorption ◽  
Atomic Resonance ◽  
Quantitative Measurements ◽  
Series Of Experiments ◽  
Kinetics Of Reaction ◽  
Oxygen Atoms

The kinetics of reaction of C2H5OH with N2O behind shock waves is studied. The quantitative measurements of the time profiles of concentration of O atoms were carried out by the method of atomic resonance absorption spectroscopy (ARAS) using resonance vacuum-ultraviolet line of O-atom at 130.5 nm. For the calibration of absorption intensity of oxygen atoms depending on its concentration, the special series of experiments in the mixture containing different amounts of N2O in Ar was carried out at T = 2100 ± 50 K when molecule of N2O is completely dissociated. An experimental study of the appearance and consumption of oxygen atoms during the reaction of ethanol with oxygen in mixture 10 ppm N2O + (10 ... 0.1) ppm C2H5OH + Ar at temperatures of 16002300 K and pressures of 200-300 kPa have been carried out. A kinetic analysis of obtained data was performed using the Chemkin package.

An Experimental Test of the Effects of a Monetary Incentive on Cooperation Rates and Data Collection Costs in Central-Location Interviewing

1983 ◽  
Vol 20 (4) ◽  
pp. 439-442 ◽  
Author(s):  
Frederick Wiseman ◽  
Marianne Schafer ◽  
Richard Schafer
Keyword(s):  
Experimental Study ◽  
Data Collection ◽  
Experimental Test ◽  
Monetary Incentive ◽  
Willingness To Participate ◽  
Central Location ◽  
The Cost ◽  
Collection Costs

The authors describe an experimental study designed to determine the effects of a monetary incentive on (1) a potential respondent's decision to participate in a central-location interview, (2) that person's expressed willingness to participate in a future survey, and (3) the cost of data collection.

scholarly journals Experimental Study on the Cement-Based Materials Used in Coal Mine Gas Extraction for Hole Sealing

ACS Omega ◽  
2021 ◽  
Author(s):  
Jianhua Fu ◽  
Dengke Wang ◽  
Xuelong Li ◽  
Zhiming Wang ◽  
Zhengjie Shang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Coal Mine ◽  
Gas Extraction ◽  
Coal Mine Gas ◽  
Cement Based Materials ◽  
Mine Gas ◽  
Materials Used

Synthesis of Aluminum Nitride by Nitridation of γ-Al2O3 Nanoparticles in Flowing Ammonia

2008 ◽  
Vol 368-372 ◽  
pp. 1116-1118
Author(s):  
Zong Hao Huang ◽  
Long Hao Qi ◽  
Wei Pan ◽  
He Zhuo Miao
Keyword(s):  
Reaction Mechanism ◽  
Aluminum Nitride ◽  
Series Of Experiments

Aluminum nitride (AlN) powder was synthesized by gas reduction–nitridation of γ-Al2O3, using NH3 as the reactant gas. The results showed that AlN can be fabricated by this process at 1100°C for over 480 min in the flowing NH3 atmosphere. However, no AlN was found in the products synthesized at 1300°C and 1400°C, which was different from the former reports. A series of experiments with different parameters were carried out, and the effects of reacting temperature and time on the synthesis of AlN were investigated. The reaction mechanism was also studied.

Use of a Pendulum for Passive Structural Vibrations Control: An Experimental Study

1993 ◽  
Author(s):  
A. Ertas ◽  
O. Cuvalci
Keyword(s):  
Experimental Study ◽  
Dynamic Response ◽  
Passive Control ◽  
Control Device ◽  
Structural Vibrations ◽  
Pendulum System ◽  
Series Of Experiments ◽  
Tip Mass

Abstract The dynamic response of a beam-tip mass-pendulum system subjected to sinusoidal excitations is considered. The conditions under which resonant and nonresonant oscillations occur are investigated and discussed. The main objective of this study was to conduct a series of experiments to investigate the autoparametric interaction between the first two modes of the system. The use of a pendulum as a passive control device was experimentally evaluated.

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