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PARTICULATE CONCENTRATION ENRICHMENT OF PRIMARY AIR IN PULVERIZED COAL boilers

China Particuology 2004年第5期2卷 230-233页

作者： HaiZhang XiuqingXu KeyLaboratoryofThermalScienceandPowerEngineering DepartmentofThermalEngineeringTsinghuaUniversityBeijing100084RR.China

Particulate concentration enrichment (PCE) of primary air favors flame ignition and stabilization, and the reduction of NOx emission in pulverized coal combustion. The methods used for PCE are summarized in five categories: Cyclone PCE, Elbow PCE, Blunt-body PCE, Hydrodynamic PCE and Swirling PCE. Practice of each PCE method is il- lustrated with typical burners and the associated pros and cons are discussed. It is found that the same principle prevails in all PCE methods, that is, due to inertial difference, solid particles preferentially decelerate and separate from the gas stream when the main flow deviates in flow orientation. From analysis of various P-C burners, PCE design is deemed to yet comprise “rule of thumb” practice. Somediscussions regarding PCE application are given.

关键词： particulate concentration enrichment (PCE) boilers separation two-phase flow

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Work boilers in the Real Heat Loads

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Journal of Mechanics Engineering and Automation 2013年第2期3卷 121-126页

作者： Rafal Urbaniak Jaroslaw Bartoszewicz Chair of Thermal Engineering Poznan University of Technology Poznah 60-965 Poland

Analysis was performed on the boiler for solid fuels in a corresponding real-thermal load. The tests were conducted with the use of a low-temperature top-loading KWSM water boiler. For control of the burning process, three control algorithms were used as implemented in microprocessor temperature controls. The analysis aimed at determination of influence of the control algorithm upon quality of the buming process in conditions of actual demand for thermal energy. The detailed analysis of operating parameters in relation to the variable thermal load of the boiler provided necessary information and made it possible to state that control algorithms do influence quality of the controlled process. Particular attention was paid to a situation, in which demand for thermal energy is decreased.

关键词： boilers coal power control emission of pollution.

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Experimental Study and Modeling of a Convective Dryer for Fruits and Vegetables

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Engineering（科研） 2023年第1期15卷 13-23页

作者： Souleymane Sinon Salifou Tera Kayaba Haro El-Maktoume Djanfar Oumar Sanogo Sié Kam Laboratoire d’Energies Thermiques Renouvelables (LETRE) Université Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratoire des Systèmes d’énergie Renouvelable et Environnement (LASERE) Institut de Recherche en Sciences Appliquées et Technologies (IRSAT/CNRST) Ouagadougou Burkina Faso Laboratoire de Modélisation Pluridisciplinaire et Simulations (LAMPS) Université de Perpignan Via Domitia Perpignan France Laboratoire énergétique de l’équipe d’Accueil Doctoral physique du Globe de l’Energie et de l’Environnement (PGEE) Université d’Antananarivo Antananarivo Madagascar

The present work deals with the study of the thermal performances of a convective dryer for fruits and vegetables. This dryer, operating with energy generated from the combustion of biomass in a boiler connected to a water/air heat exchanger could be a solution to the problematic of energy related to drying. An experimental and theoretical study is carried out on the temperature profile inside the dryer. For this purpose, 10.3 kg of tomatoes were dried on the experimental setup. The operation lasted about 16 hours and reduced the moisture content from 93.8% to 12% in wet basis. The overall thermal efficiency of the convective dryer during the trial is 10.76%. For the theoretical study, the dryer components (boiler, water/air exchanger and drying chamber) are first modeled individually;the different sub-programs are then coupled to form the convective dryer program. The method of global heat balances combined with the one called “ε-NUT” is used. The set of equations is discretized using the implicit method of finite differences, then solved with the Gauss algorithm in Fortran 90. The theoretical results obtained are in good agreement with those measured.

关键词： Energy Drying Biomass boilers Fruits and Vegetables

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