Gamasoidosis from the tropical fowl mite Ornithonyssus bursa (Acari: Gamasida: Macronyssidae) (Berlese, 1888): successful eradication of the domestic infestation with dry saturated steam

2021 ◽  
Author(s):  
Paolo Masini ◽  
Sara Zampetti ◽  
Maria Vittoria Rossetti ◽  
Fabio Biancolini ◽  
Gloria Miñón Llera ◽  
...  
Keyword(s):  
Saturated Steam ◽  
Ornithonyssus Bursa

Saving Primary Energy Consumption Through Exergy Analysis of Combine Distillation and Power Plant

2012 ◽  
Vol 9 (2) ◽  
pp. 65
Author(s):  
Alhassan Salami Tijani ◽  
Nazri Mohammed ◽  
Werner Witt
Keyword(s):  
Energy Consumption ◽  
Power Plant ◽  
Heat Pump ◽  
Heat Recovery ◽  
Energy Savings ◽  
Primary Energy ◽  
Heat Pumps ◽  
Saturated Steam ◽  
Distillation Unit ◽  
Primary Energy Consumption

Industrial heat pumps are heat-recovery systems that allow the temperature ofwaste-heat stream to be increased to a higher, more efficient temperature. Consequently, heat pumps can improve energy efficiency in industrial processes as well as energy savings when conventional passive-heat recovery is not possible. In this paper, possible ways of saving energy in the chemical industry are considered, the objective is to reduce the primary energy (such as coal) consumption of power plant. Particularly the thermodynamic analyses ofintegrating backpressure turbine ofa power plant with distillation units have been considered. Some practical examples such as conventional distillation unit and heat pump are used as a means of reducing primary energy consumption with tangible indications of energy savings. The heat pump distillation is operated via electrical power from the power plant. The exergy efficiency ofthe primary fuel is calculated for different operating range ofthe heat pump distillation. This is then compared with a conventional distillation unit that depends on saturated steam from a power plant as the source of energy. The results obtained show that heat pump distillation is an economic way to save energy if the temperaturedifference between the overhead and the bottom is small. Based on the result, the energy saved by the application of a heat pump distillation is improved compared to conventional distillation unit.

scholarly journals Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3860
Author(s):  
Mária Hagarová ◽  
Milan Vaško ◽  
Miroslav Pástor ◽  
Gabriela Baranová ◽  
Miloš Matvija
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Gas Flow ◽  
Degradation Process ◽  
Flue Gases ◽  
Saturated Steam ◽  
Mineral Salts ◽  
Related Factors ◽  
Local Overheating ◽  
Inner Surface

Corrosion of boiler tubes remains an operational and economic limitation in municipal waste power plants. The understanding of the nature, mechanism, and related factors can help reduce the degradation process caused by corrosion. The chlorine content in the fuel has a significant effect on the production of gaseous components (e.g., HCl) and condensed phases on the chloride base. This study aimed to analyze the effects of flue gases on the outer surface and saturated steam on the inner surface of the evaporator tube. The influence of gaseous chlorides and sulfates or their deposits on the course and intensity of corrosion was observed. The salt melts reacted with the steel surface facing the flue gas flow and increased the thickness of the oxide layer up to a maximum of 30 mm. On the surface not facing the flue gas flow, they disrupted the corrosive layer, reduced its adhesion, and exposed the metal surface. Beneath the massive deposits, a local overheating of the inner surface of the evaporator tubes occurred, which resulted in the release of the protective magnetite layer from the surface. Ash deposits reduce the boiler’s thermal efficiency because they act as a thermal resistor for heat transfer between the flue gases and the working medium in the pipes. The effect of insufficient feedwater treatment was evinced in the presence of mineral salts in the corrosion layer on the inner surface of the tube.

Efficacy of saturated steam against Listeria innocua biofilm on common food-contact surfaces

Food Control ◽  
2021 ◽  
Vol 125 ◽  
pp. 107988
Author(s):  
Zi Hua ◽  
Frank Younce ◽  
Juming Tang ◽  
Dojin Ryu ◽  
Barbara Rasco ◽  
...  
Keyword(s):  
Listeria Innocua ◽  
Saturated Steam ◽  
Food Contact ◽  
Common Food ◽  
Food Contact Surfaces ◽  
Contact Surfaces

scholarly journals Laminar condensation on a moving drop. Part 1. Singular perturbation technique

1984 ◽  
Vol 139 ◽  
pp. 105-130 ◽  
Author(s):  
J. N. Chung ◽  
P. S. Ayyaswamy ◽  
S. S. Sadhal
Keyword(s):  
Singular Perturbation ◽  
Perturbation Technique ◽  
Continuous Phase ◽  
Transport Processes ◽  
Forced Flow ◽  
Saturated Steam ◽  
Singular Perturbation Technique ◽  
Spherical Drop ◽  
Coupled Equations ◽  
Induced Velocity

In this paper, laminar condensation on a spherical drop in a forced flow is investigated. The drop experiences a strong, radial, condensation-induced velocity while undergoing slow translation. In view of the high condensation velocity, the flow field, although the drop experiences slow translation, is not in the Stokes-flow regime. The drop environment is assumed to consist of a mixture of saturated steam (condensable) and air (non-condensable). The study has been carried out in two different ways. In Part 1 the continuous phase is treated as quasi-steady and the governing equations for this phase are solved through a singular perturbation technique. The transient heat-up of the drop interior is solved by the series-truncation numerical method. The solution for the total problem is obtained by matching the results for the continuous and dispersed phases. In Part 2 both the phases are treated as fully transient and the entire set of coupled equations are solved by numerical means. Validity of the quasi-steady assumption of Part 1 is discussed. Effects due to the presence of the non-condensable component and of the drop surface temperature on transport processes are discussed in both parts. A significant contribution of the present study is the inclusion of the roles played by both the viscous and the inertial effects in the problem treatment.

Heat-and-Mass Transfer Intensification in Saturated-Steam Generators in NPP with VVER as a Means for Increasing Efficiency and Reliability

Atomic Energy ◽  
2018 ◽  
Vol 123 (3) ◽  
pp. 154-158 ◽  
Author(s):  
N. D. Agafonova ◽  
M. Yu. Egorov ◽  
V. V. Sergeev ◽  
M. A. Gotovskii ◽  
P. A. Kruglikov ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Saturated Steam ◽  
Steam Generators ◽  
Efficiency And Reliability ◽  
Mass Transfer Intensification

Studies on the Effect of Sinapic Acid on Silk Fabric Printing with Sorghum Red

2013 ◽  
Vol 796 ◽  
pp. 395-399 ◽  
Author(s):  
Xi Chun Dai ◽  
Zhi Wei Hang ◽  
Xiang Rong Wang
Keyword(s):  
Guar Gum ◽  
Sinapic Acid ◽  
Natural Dye ◽  
Natural Dyes ◽  
Saturated Steam ◽  
Silk Fabric ◽  
Light Fastness ◽  
Wash Fastness

In order to improve fastness of printing silk fabric with natural dyes, the influence of sinapic acid on printing of silk fabric with sorghum red was investigated in this work. The silk fabric was printed using guar gum as paste, sorghum red as natural dye, sinapic acid as auxiliaries. The appropriate steaming condition was the temperature 100°C, time 15min and saturated steam. The results showed that the light fastness and the wash fastness of the printed fabric were improved by the addition of sinapic acid. It is proposed that sinapic acid can be applied as effective fastness improver of natural dyes.

Design and implementation of automatic control for a condensation-induced depressurization system

2018 ◽  
Vol 233 (9) ◽  
pp. 1146-1158
Author(s):  
Fen Du ◽  
Bo Zhang ◽  
Chao Zhu ◽  
Zhiming Ji ◽  
Chao-Hsin Lin
Keyword(s):  
Control System ◽  
Atmospheric Pressure ◽  
Flow System ◽  
Thermodynamic Cycle ◽  
Saturated Steam ◽  
Low Grade ◽  
Steam Condensation ◽  
Open Flow ◽  
Process Characteristics ◽  
Cascade Arrangement

This study develops a control system to automate the operation of a condensation-induced depressurization technology, which is used to achieve sub-atmospheric pressure in an open-flow system on ground. The continuous depressurization is maintained via an integrated series of chambers inside which vacuum is regenerated by condensing and refilling of saturated steam. The low pressure generated inside the chambers is then used to alternatively extract the air out of a flow system for maintaining its sub-atmospheric pressure. The thermodynamic cycle in such a vacuum chamber consists of three sub-processes: air purging to ambient by steam refilling, depressurization by steam condensation, and air-extraction from a flow application. As one chamber undergoing these consecutive processes, another chamber operates in a coordinated different phase to seamlessly maintain a continuous air-extraction operation. This new system provides a quiet and efficient way of using low-grade energy to generate hypobaric environment for needed applications. A cascade arrangement of a proposed multiple-chamber operation is also illustrated. A control system is designed and implemented to realize the automatic and coordinated operation in a dual-chamber, laboratory-scaled system. Exemplified results on process characteristics such as chamber depressurization and air purging are also provided.

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