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Research on flue gas desulphurization with two sorbents by water spray in activated reactor

Journal of Southeast University(English Edition) 2003年第4期19卷 355-358页

作者：赵长遂吴树志刘现卓吴新陈晓平段钰锋东南大学洁净煤发电及燃烧技术教育部重点实验室南京210096

The experimental results of flue gas desulphurization with caustic lime andhydrated lime activated by water spraying in a desulphurization reactor are presented. The effectsof Ca/S molar ratio, approach to saturation of flue gas, SO_2 concentration and gas velocity onsulfur retention efficiency and calcium utilization rate are investigated. Desulphurizationcharacteristics of the two sorbents are compared. The mechanism of improving desulphurizationefficiency by water spraying is analyzed. The results show that the activities of two sorbents areimproved obviously by humidification with water spray and the caustic lime has better applicationprospect because of cheaper cost.

关键词： desulphurization lime water spray activation

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Experimental and numerical study of water sprayed turbulent combustion: Proposal of a neural network modeling for five-dimensional flamelet approach

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能源与人工智能(英文) 2021年第3期5卷 316-324页

作者： Takafumi Honzawa Reo Kai Kotaro Hori Makoto Seino Takayuki Nishiie Ryoichi Kurose Department of Mechanical Engineering and Science Graduate School of EngineeringKyoto UniversityKyoto daigaku-KatsuraNishikyo-kuKyoto 615-8540Japan Tokyo Gas Co. Ltd.1-7-7 Suehiro-choTsurumi-kuYokohamaKanagawa 230-0045Japan Numerical Flow Designing Co. Ltd.1-10-10Higashi-GotandaShinagawa-kuTokyo 141-0022Japan

Owing to the increasing worldwide demand for natural gas,the development of a large submerged combustion vaporizer is *** burner is equipped with a water spray nozzle to reduce nitrogen oxides,and a practi-cal simulation method is required for the optimal *** non-adiabatic flamelet approach can predict the combustion emissions and is useful for reducing simulation ***,as the number of control variables increases,the database requires larger memory and cannot be dealt with by general *** this study,an artificial neural network(ANN)model based on a five-dimensional flamelet database,which includes the effects of heat loss and vapor concentration by sprayed water evaporation,is ***,large eddy sim-ulations(LESs)for turbulent combustion fields with and without water spray are conducted employing flamelet generated manifold(FGM)approach with this ANN model,and the validity is *** comparison,a lab-scale burner equipped with a water spray nozzle is manufactured,and combustion experiments with and without water spray are *** results show that CO,NO,temperature,and reaction rate of progress variable predicted by the present ANN model are in good agreement with those of a five-dimensional flamelet *** the condition without water spray,the flame behavior predicted by the LES employing the FGM/ANN ap-proach is in good agreement with that employing the conventional FGM approach,while indicating much lower memory,although there appeared some quantitative discrepancies in the temperature against the experiment probably partially because of the insufficiency of the FGM approach for the present complex flame *** the condition with water spray,the LES employing the FGM/ANN approach is able to capture the effect of the water spray on the flame behavior in the experiment,such that the water spray decreases the temperature,which causes the decrease in NO but increase in CO.

关键词： Neural network modeling Five-dimensional flamelet approach water spray Large eddy simulation

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Developing a Computer Program for Detailed Study of Planing Hull＇s spray Based on Morabito＇s Approach

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Journal of Marine Science and Application 2014年第4期13卷 402-415页

作者： Parviz Ghadimi Sasan Tavakoli Abbas Dashtimanesh Arya Pirooz Department of Marine Technology Amirkabir University of Technology Tehran 15875-4413 Iran Faculty of Engineering Persian Gulf University Bushehr *** Iran International Branch Amirkabir University of Technology Tehran 15875-4413 Iran

Recently, Morabito(2010) has studied the water spray phenomena in planing hulls and presented new analytical equations. However, these equations have not been used for detailed parametric studies of water spray around planing hulls. In this paper, a straight forward analysis is conducted to apply these analytical equations for finding the spray geometry profile by developing a computer program based on presented computational process. The obtained results of the developed computer program are compared against existing data in the literature and favorable accuracy is achieved. Parametric studies have been conducted for different physical parameters. Positions of spray apex are computed and three dimensional profiles of spray are examined. It is concluded that spray height increases by an increase in the speed coefficient or the deadrise angle. Ultimately, a computational process is added to Savitsky's method and variations of spray apex are computed for different velocities. It is shown that vertical, lateral, and longitudinal positions of spray increase as the craft speed increases. On the other hand, two new angles are defined in top view and it is concluded that they have direct relation with the trim angle. However, they show inverse relation with the deadrise angle.

关键词： spray prismatic planing hull mathematical modeling water spray parametric study

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Design of a water curtain to reduce accumulations of float coal dust in longwall returns

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International Journal of Mining Science and Technology 2020年第4期30卷 443-447页

作者： Clara E.Seaman Michael R.Shahan Timothy W.Beck Steven E.Mischler National Institute for Occupational Safety and Health Pittsburgh Mining Research DivisionPittsburghPA 15236USA

Accumulation of float coal dust(FCD)in underground mines is an explosion hazard that affects all underground coal mine *** this hazard is addressed by the application of rock dust,inadequate rock dusting practices can leave miners exposed to an explosion *** at the National Institute for Occupational Safety and Health(NIOSH)have focused on developing a water curtain that removes FCD from the airstream,thereby reducing the buildup of FCD in mine *** this study,the number and spacing of the active sprays in the water curtain were varied to determine the optimal configuration to obtain peak knockdown efficiency(KE)while minimizing water consumption.

关键词： Float coal dust Longwall water spray Knockdown efficiency Explosion prevention Dust control

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