Experimental Investigation of Flow Resistance in a Coal Mine Ventilation Air Methane Preheated Catalytic Oxidation Reactor

Zheng, Bin; Liu, Yongqi; Liu, Ruixiang; Meng, Jie; Mao, Mingming

doi:10.1155/2015/375789

Cited by 4 publications

(4 citation statements)

References 25 publications

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“…Bruceet and Koenning summarized the ventilation resistance values of some typical roadways through the calculation of ventilation resistance in various modes by using the improved computer programs [9]. Gao et al converted the ventilation resistance coefficient inversion problem into a nonlinear optimization problem and adopted the genetic algorithm to solve the ventilation resistance coefficient [10][11]. Song et al [13] adjusted the ventilation simulation model through computational feedback and proposed the influences of the open area of the wind window on the regulation of ventilation resistance [12][13].…”

Section: State Of the Artmentioning

confidence: 99%

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Derivation and Verification Analysis of Local Ventilation Resistance Formula of the Section Gradual Reduction Roadway

Wang¹,

Zhang²,

Yongge³

2019

JESTR

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The gradually reduced section of the roadway is a transitional section connecting two different roadways, which plays an important role in reducing the local ventilation resistance of the mine ventilation system. To reveal the local ventilation resistance characteristics of the roadway, the flow dynamics model of the roadway was bulit, the formula of the local ventilation resistance of the section gradual reduction roadway was deduced, and the formula was verified by the measured data. Results show that the local resistance coefficient, local ventilation resistance, and local air resistance of the gradually reduced section of the roadway are reduced by 5.71, 1.59, and 1.52 times of that of the suddenly reduced section of the roadway, respectively, which indicates that section gradual reduction roadway is in a lower energy consumption state. The conclusions obtained in the study are of great value to direct the design and construction of the similar engineering practice.

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Section: State Of the Artmentioning

confidence: 99%

“…are substituted into Eqs (11). and(12), then m ρ =1.2199 kg/m³.The local ventilation resistance can be obtained by combining Eqs.…”

mentioning

confidence: 99%

Derivation and Verification Analysis of Local Ventilation Resistance Formula of the Section Gradual Reduction Roadway

Wang¹,

Zhang²,

Yongge³

2019

JESTR

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“…Since some of the energy is consumed to sustain the heat of the reaction not all of the heat is available for recovery for example, for a VAM concentration of 0.7 the TFRR can recover 75% of the energy while the CFRR recovery is only 34%. These systems introduce a pressure drop, due to the resistance encountered as the ventilation air stream flows through a bed of ceramic beads or gravel (35), which require supplemental fans to overcome (36).…”

Section: Drawbacks Of the Current Technologymentioning

confidence: 99%

Capturing energy from ventilation air methane a preliminary design for a new approach

Cluff

Kennedy

Bennett

et al. 2015

Applied Thermal Engineering

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The greenhouse gas (GHG) radiative forcing factor of methane is often quoted as 23 times as potent as carbon dioxide on a 100-year time horizon; thus, any reduction in atmospheric methane would be globally beneficial. The capture or use of ventilation air methane (VAM) is challenging because it is a high volume low concentration methane source. This results in the routine discharge of methane into the atmosphere.A review of VAM mitigation technologies is provided and the main disadvantages of the existing technologies are discussed. In the proposed VamTurBurner© system, the heat from the combustion chamber is transferred to the preheating zone either by a heat exchanger or by redirecting the combustion products to mix with the ventilation air stream from a coalmine. Gas turbines (GT) are used to produce electricity with the exhaust gases directed to mix with the incoming ventilation airflow. The turbulence introduced by the GT exhaust assists with mixing of the incoming ventilation airflow and the return flow of combustion products from the combustion chamber. The combustion products are a source of heat, which increases the temperature of the incoming ventilation air to a value high enough for the methane to undergo flameless combustion upon encountering the igniters.The high temperature combustion products enter a multi-generation system. The multi-generation system is based on mature engineering technology such as heat exchangers and steam turbines. The residual heat provides additional heat based products such as industrial scale drying, chilling by an absorption chiller or simply hot water.The VamTurBurner© uses the energy from the GT, igniters and VAM to provide clean efficient energy while mitigating the atmospheric emissions of methane. The opportunity to collect carbon credits may improve the economics. Since the VAM is a free energy source, the output of the system is greater than the purchased energy.

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“…18 There are two main mature types of regenerative thermal oxidizer: one is the thermal flow reverse reactor (TFRR) developed by the American company Sequa and the Swedish ADTEC, and the other is the catalytic flow reverse reactor (CFRR) prepared by the relevant laboratory in Canada. 19,20 At present, research on thermal flow reverse reactors has been relatively mature, including mathematical models and verification, [21][22][23] experimental studies, [24][25][26][27] simplification of reaction mechanism, 19,20 reaction kinetics, [28][29][30] reactor operation stability, 31 thermal fatigue of thermal storage materials and reactor design methods. [32][33][34] These advancements have laid the foundation for the transformation and upgrading strategy of energy conservation and emission reduction in the coal mining industry.…”

Section: Introductionmentioning

confidence: 99%

Study on the influence of different thermal coals on the mixed‐burning characteristics of ventilation air methane and pulverized coal

Hao,

Liu,

Chen

et al. 2024

Greenhouse Gases

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To effectively utilize ventilation air methane (VAM), it is proposed to pass it into the boiler of the coal‐fired power plant for mixed combustion. However, the different types of thermal coal utilized present distinct characteristics when mixed with VAM. In this paper, lignite, bituminous coal, and anthracite are selected to study the CH4 conversion rate, system ignition temperature, and NO emission characteristics of the VAM‐pulverized coal coupled system on a fluidized bed experimental platform. The experimental results show that the ignition temperatures of VAM are 748, 736, and 732 °C when the CH4 concentration is 0.25, 0.5, and 0.75%. After the addition of thermal coal, the ignition temperature decreased significantly. When the CH4 concentration is 0.25%, the ignition temperature of the lignite‐VAM system is the lowest, which is 450 °C. Anthracite has the strongest catalytic effect on CH4 combustion. When the heating rate is 5 °C /min, the reaction rate of CH4 is the fastest in the anthracite‐VAM coupled system. Under laboratory conditions, the peak NO concentration in the coal‐VAM coupled system was lignite > bituminous coal > anthracite at different CH4 concentrations, and the CH4 in VAM had a reducing action on the NO generated during mixed combustion, with a stronger reducing effect observed as the CH4 concentration increased. The results of this study can lay the foundation for the industrial application of the mixed combustion of VAM and thermal coal, and be of great significance for solving the practical problems caused by the change of boiler coal types. © 2024 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Experimental Investigation of Flow Resistance in a Coal Mine Ventilation Air Methane Preheated Catalytic Oxidation Reactor

Cited by 4 publications

References 25 publications

Derivation and Verification Analysis of Local Ventilation Resistance Formula of the Section Gradual Reduction Roadway

Derivation and Verification Analysis of Local Ventilation Resistance Formula of the Section Gradual Reduction Roadway

Capturing energy from ventilation air methane a preliminary design for a new approach

Study on the influence of different thermal coals on the mixed‐burning characteristics of ventilation air methane and pulverized coal

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