scholarly journals The Instability of Flame Fronts in Premixed Combustion of Low-Temperature Gases (Effects of Unburned-Gas Temperature)

2013 ◽  
Vol 79 (803) ◽  
pp. 1391-1395 ◽  
Author(s):  
Yusuke AOKI ◽  
Wataru YAMAZAKI ◽  
Satoshi KADOWAKI
Keyword(s):  
Low Temperature ◽  
Premixed Combustion ◽  
Gas Temperature

Numerical Simulation of Turbulent Combustion Flows for Coaxial Jet Cluster Burner

2013 ◽  
Author(s):  
Keita Yunoki ◽  
Tomoya Murota ◽  
Keisuke Miura ◽  
Teruyuki Okazaki
Keyword(s):  
Turbulent Combustion ◽  
High Efficiency ◽  
Premixed Combustion ◽  
Premixed Flame ◽  
Gas Temperature ◽  
Lean Premixed Combustion ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Lean Premixed ◽  
Multiple Holes

We have developed a burner for the gas turbine combustor, which was high efficiency and low environmental load. This burner is named the “coaxial jet cluster burner” and, as the name indicates, it has multiple fuel nozzles and holes in a coaxial arrangement. To form lean premixed combustion, this burner mixes fuel and air in the multiple holes rapidly. The burner can change the combustion form between premixed and non-premixed combustion by controlling the mixing. However, the combustion field coexisting with premixed and non-premixed combustion is complicated. The phenomena that occur in the combustion field should be understood in detail. Therefore, we have developed the hybrid turbulent combustion (HTC) model to calculate the form in which non-premixed flame coexists with premixed flame. Turbulent flow has been simulated using a large eddy simulation (LES) with a dynamic sub grid scale (SGS) model coupled with the HTC model. These models were programmed to a simulation tool based on the OpenFOAM library. However, there were unclear points about their applicability to an actual machine evaluation and the predictive precision of CO concentration which affects burner performance. In this study, we validate the HTC model by comparing its results with measured gas temperature and gas concentration distributions obtained with a coaxial jet cluster burner test rig under atmospheric pressure. In addition, we analyze the CO generation mechanism for the lean premixed combustion in the burner.

Study of Model-based Cooperative Control of EGR and VGT for a Low-temperature, Premixed Combustion Diesel Engine

2001 ◽  
Author(s):  
Takashi Shirawaka ◽  
Manabu Miura ◽  
Hiroyuki Itoyama ◽  
Eiji Aiyoshizawa ◽  
Shuji Kimura
Keyword(s):  
Diesel Engine ◽  
Low Temperature ◽  
Cooperative Control ◽  
Premixed Combustion ◽  
Model Based

scholarly journals Real gas state equations comparative analysis for low-temperature calculations

2019 ◽  
Vol 140 ◽  
pp. 05007 ◽  
Author(s):  
Mikhail Sokolov ◽  
Nikolay Sadovsky ◽  
Anatoly Zuev ◽  
Lyubov Gileva ◽  
Minh Hai Nguyen
Keyword(s):  
Comparative Analysis ◽  
Low Temperature ◽  
Exact Equation ◽  
Gas Temperature ◽  
State Equations ◽  
Two Phase ◽  
Accurate Identification ◽  
Real Gas ◽  
Mass Transfer Processes ◽  
Definition Of

In this paper, various real gas state equations are considered and their comparative analysis is carried out. The following state equations are studied in the work: Benedict-Webb-Rubin modification equation, Ridlich-Kwong Real Gas equation, Peng-Robinson Real Gas equation, and the modified Ridlich-Kwong real gas state equations proposed by Barsuk S.D. We have made a direct comparison of these calculation methods with most accurate identification. In addition, the paper analyzes the equations features, with applicability limits definition of each state equations. For the chosen one, as the most universal and exact equation, the calculations were made for the liquid phase and the real gas two-phase state. Based on the data obtained, polynomials were developed for various parameters depending on the gas temperature, which can later be used to build various mathematical models. Our conclusions show main advantages of selected equation for real gases and the reasons for choosing it for modeling low-temperature heat and mass transfer processes.

Energy-Saving Analysis of 215MW Cogeneration Boiler Adding Low Temperature Economizer

2013 ◽  
Vol 448-453 ◽  
pp. 2777-2780 ◽  
Author(s):  
Yan Feng Liu ◽  
Shi Ping Li ◽  
Xiang Hong Li
Keyword(s):  
Low Temperature ◽  
Flue Gas ◽  
Waste Heat ◽  
Natural Circulation ◽  
Peak Load ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
Bag Filter ◽  
Actual Operation ◽  
Exhaust Gas Temperature

A 215MW cogeneration B&W670/13.7-M type high-pressure natural circulation boilers, the exhaust gas temperature is set as 143 °C, while in the actual operation, the average exhaust gas temperature is 155 °C, and when the unit is running at full capacity in summer the highest exhaust gas temperature is 169.6 °C. In order to satisfy the normal operating temperature of bag filter in summer peak load, and recover low temperature waste heat of fule gas, low temperature economizer is added to the thermal system. Therefore, low-temperature economizers are respectively added in four flues which are between the outlet of the air preheater and the entrance of the bag filter, this will achieve the purpose of reducing flue gas temperature by transferring heat between condensate and flue gas, ensuring the units safe operating and improving the overall operating performance of the boiler.

Non-Pressure Heater Utilization on Low-Capacity Industrial Boiler

2014 ◽  
Vol 960-961 ◽  
pp. 394-398
Author(s):  
Guang Hua Li ◽  
Qun Feng Yang
Keyword(s):  
Low Temperature ◽  
Water Supply ◽  
Waste Heat ◽  
Gas Temperature ◽  
Recycling System ◽  
Intermittent Water Supply ◽  
Supply Condition ◽  
Boiler Efficiency ◽  
Industrial Boiler

A new non-pressure waste heat recycling system was designed and arranged on KHSS0.5-0.7-AⅡ industrial coal-fired boiler to decrease the exhausted gas temperature about 35°C, improve the boiler efficiency about 3.2%. Results showed that this system can avoid low-temperature sulfur corrosion and operate in normal and intermittent water supply condition safely and economically.

scholarly journals Study on denitration performance of multi element modified MIL-101 (Fe) at low temperature

2022 ◽  
Vol 355 ◽  
pp. 01023
Author(s):  
Shuqin Wang ◽  
Xiaoxue Li ◽  
Jinjin Wu
Keyword(s):  
Low Temperature ◽  
Flue Gas ◽  
Selective Adsorption ◽  
Amino Group ◽  
Optimal Conditions ◽  
Gas Temperature ◽  
High Concentration ◽  
Microwave Hydrothermal ◽  
Catalytic Role ◽  
As Adsorption

MIL-101 (Fe) was modified by amino group and doped by Cu and Co elements by microwave hydrothermal method. The effect of SCR denitrification at low temperature was investigated with high concentration of NOx as adsorption object. The results show that when the flue gas temperature is 200 °C and the NOx concentration is up to 1640 mg/m3, the removal efficiency of NOx can reach 86% under the optimal conditions, which is 1.5 times higher than that before modification. In addition, the characterization results indicated that the specific surface area of the modified catalyst increased, the thermal stability was good at low temperature, the selective adsorption capacity of NO was enhanced, and the doping played a synergistic catalytic role. It can be used for flue gas denitration in various industries.

scholarly journals LOW-TEMPERATURE ATMOSPHERIC-PRESSURE PLASMA IN MICROBIAL DECONTAMINATION AND MEAT TECHNOLOGY. A REVIEW

2019 ◽  
Vol 4 (1) ◽  
pp. 21-29
Author(s):  
Natalia A. Gorbunova
Keyword(s):  
Low Temperature ◽  
Plasma Treatment ◽  
Biological Effects ◽  
Meat Products ◽  
High Electron ◽  
Low Temperature Plasma ◽  
Gas Temperature ◽  
High Concentration ◽  
Temperature Plasma ◽  
Biological Objects

The development of plasma technology is associated with the unique features of non-equilibrium low-temperature plasma: high electron energy and high concentration of chemically active excited and charged particles at low gas temperature, which allows to process thermolabile materials and biological objects in gentle conditions when high temperatures are not required. The biological effects of low-temperature plasma exposure are considered. It was established that during plasma treatment, a combined effect on cells and tissues of living systems from UV radiation, ions and chemically active particles occurs. Depending on the plasma type, the significance of each of the listed mechanisms for increasing the effectiveness of plasma treatment may vary. However, all these mechanisms interact with each other and have a synergistic effect. It was shown that the conducted studies confirm the ability of low-temperature plasma to inactivate pathogenic microorganisms upon contact with biological objects and foods. The results of the studies are presented, the purpose of which was to study the effect of plasma treatment on nitrite concentration in the water treated by this method and to assess the possibility of its use as a source of nitrite when curing meat products.

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