scholarly journals Comparison of gas dehydration methods based on energy consumption

2016 ◽  
Vol 20 (2) ◽  
pp. 253-258
Author(s):  
B.S. Kinigoma ◽  
G.O. Ani
Keyword(s):  
Energy Consumption ◽  
Natural Gas ◽  
High Pressures ◽  
Energy Requirement ◽  
Chemical Properties ◽  
Triethylene Glycol ◽  
Design Engineers ◽  
Natural Gas Dehydration ◽  
Physical And Chemical ◽  
Low Pressures

This study compares three conventional methods of natural gas (Associated Natural Gas) dehydration to carry out the dehydration process and suitability of use on the basis of energy requirement. These methods are Triethylene Glycol (TEG) absorption, solid desiccant adsorption and condensation. Analyses performed were based on dehydration of Natural Gas saturated with 103Nm3/h water content at a temperature range of -10O C to 30oC, and gas pressure variation between 7MPa and 20MPa. This analysis and study showed that energy required for all three processes decreases with increase in pressure, but condensation dehydration requires the least energy at high pressures. Results obtained shows that, both at high pressures and low pressures, TEG dehydration is most suitable and in cases where very low Tdew is required, solid desiccant adsorption is preferable. In conclusion, the findings in this paper will aid natural gas process design engineers to decide on what method to use base  on energy consumption and on the physical and chemical properties of the final products.Keywords: Dehydration, Absorption, Desiccant, Condensation, Triethylene Glycol (TEG)

Introduction to natural gas: A comparative study of its storage, fuel costs and emissions for a harbor tug

2013 ◽  
Author(s):  
Arun Kishore Eswara ◽  
S. C. Misra ◽  
U. S. Ramesh
Keyword(s):  
Natural Gas ◽  
Chemical Properties ◽  
Heating Value ◽  
Load Profile ◽  
Emission Efficiency ◽  
Adsorbed Gas ◽  
Efficiency Parameter ◽  
Physical And Chemical ◽  
Work Done ◽  
Fuel Costs

This paper discusses the science of natural gas, its composition and ways to determine and coherently express its physical and chemical properties. Pricing of natural gas is shown with regard to weight and energy. A 60 Ton harbor tug employing either a set of constant rpm engines for CPP operation, or a set of variable rpm engines for FPP operation, with a standard load profile is made the basis for discussion. Advantage of evaluating thermal efficiency of gas engines relative to the higher heating value of natural gas, as against its lower heating value is explained. A compendium of storage options and the resulting endurance with the use of natural gas forms such as liquified gas (LNG), compressed gas (CNG) and adsorbed gas (ANG) is presented. Steps to ascertain fuel consumption of the gas engines operated according to the load profile and an approach to evaluate and relate the quantities of LNG, CNG and ANG is shown. Fuel costs and emissions from the tug operation using natural gas as fuel are evaluated per month and compared with diesel and residual fuels. Green House Gas emissions as a summation of emission constituents from the natural gas fuelled tug operation is detailed, and its need emphasized. The concepts of useful work done, emission efficiency parameter and energy efficiency parameter, which may be helpful in the design of harbor tugs and similar service vessels are proposed. The emission efficiency parameter is evaluated and analyzed for the 60 ton harbor tug.

scholarly journals Estudio del polvo de vidrio obtenido de la molienda de botellas recicladas en la provincia de Santa Elena, como sustituto parcial del cemento en el hormigón

2016 ◽  
Vol 3 (3) ◽  
pp. 27-32
Author(s):  
Juan Garcés Vargas ◽  
Vanessa Flores De la Rosa ◽  
Freddy Huaman Marcillo
Keyword(s):  
Mechanical Properties ◽  
Energy Consumption ◽  
Chemical Properties ◽  
High Energy ◽  
High Reactivity ◽  
Micron Size ◽  
The One ◽  
Calorific Power ◽  
Main Component ◽  
Physical And Chemical

 El estudio consiste en el proceso de reutilización del desecho de las botellas de vidrio y triturarlas hasta lograr  una finura tal que permita ser sustituto parcial del cemento en el hormigón, pues el vidrio al estar finamente molido al tamaño de micras actúa como puzolana de alta reactividad. El cemento es el componente principal para la producción del hormigón, también es el que mayor impacto ecológico produce al medio ambiente, esto es por la producción del Clinker que requiere de un alto consumo de energía, térmica y eléctrica,  por tal razón existen estudios para disminuir tal consumo, como la sustitución de combustible de origen fósil por residuos de alto poder calorífico, también disminuir o sustituir el cemento en las construcciones sin afectar la calidad, mejorando sus propiedades mecánicas. Esta se da usando materiales tales como la ceniza volante, escorias de alto horno o humo de sílice, empleo de materiales reciclados, entre otros. La utilización de material reciclado en el hormigón supone un doble beneficio, por un lado se disminuyen los desechos y por otro,  mejoran las propiedades mecánicas del hormigón, dicho esto, se demuestra en este trabajo que el vidrio es un material que debido a sus propiedades físicas y químicas es un candidato ideal para el reciclaje, en un alto porcentaje.  Abstract The present study consists in reusing glass bottle wastes by crushing and grounding them into a fineness that allows the partial substitute of cement in the concrete. This is because when glass has been finely grounded to a micron size, it acts as a high reactivity pozzolana. Cement is the main component for producing concrete; it is also the one that causes the highest impact to the environment because the clinker production requires high energy consumption.  There are studies to diminish the energy consumption, such as the substitution of fossil fuel for high calorific power residues, or by diminishing or substituting cement in construction without affecting its quality, and improving its mechanical properties. That is obtained by using materials such as flying ashes, blast furnace slags or silica fume, and the use of recycled materials, among others.  The use of recycled material in concrete supposes a double benefit: on the one hand wastes are diminished and, on the other hand, the mechanical properties of concrete can be improved.  That said, glass is a material that due to its physical and chemical properties, is an ideal candidate for recycling it in high percentage.

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