Retrofitting recycled stripping gas in a glycol dehydration regeneration unit

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Adhi Kurniawan ◽  
Renanto Handogo ◽  
Juwari Purwo Sutikno
Keyword(s):  
Natural Gas ◽  
High Purity ◽  
Energy Efficient ◽  
Triethylene Glycol ◽  
Recovery Process ◽  
Base Case ◽  
Gas Processing ◽  
Heating And Cooling ◽  
Natural Gas Dehydration ◽  
Regeneration Unit

Abstract Natural gas dehydration is essential in gas processing to avoid serious problems. As a pretreatment in a cryogenic Natural Gas Liquid (NGL) recovery process, it typically uses triethylene glycol (TEG) and followed by a Molecular Sieve dehydration to achieve 1 mg/Sm3 of water moisture in the dehydrated gas. This work studied the retrofitting of the existing dehydration unit to improve its performance in satisfying the gas moisture qualities. The retrofitted process uses recycled stripping gas schemes to achieve high purity TEG while minimizing the use of fresh stripping gas. The results revealed that the recycled stripping gas has provided sufficiently high purity TEG (>99.99%-wt), significantly reduced the heating and cooling duty by 80%, and reduced the electrical duty by 29% compared to the base case. The TAC was reduced by 38.1% from $ 725,245/year to $ 448,670/year. Through this study, the evaluated cases provide similar dehydration results with less equipment, simpler process, more energy-efficient, and better economic numbers. Therefore, a better process was obtained.

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)

Parametric Analysis of Natural Gas Dehydration by a Triethylene Glycol Solution

2003 ◽  
Vol 25 (3) ◽  
pp. 189-201 ◽  
Author(s):  
P. GANDHIDASAN
Keyword(s):  
Natural Gas ◽  
Parametric Analysis ◽  
Triethylene Glycol ◽  
Natural Gas Dehydration ◽  
Glycol Solution

Temperature change from isenthalpic expansion of aqueous triethylene glycol mixtures for natural gas dehydration

2011 ◽  
Vol 305 (1) ◽  
pp. 62-67 ◽  
Author(s):  
Marco A. Satyro ◽  
Florian Schoeggl ◽  
Harvey W. Yarranton
Keyword(s):  
Natural Gas ◽  
Temperature Change ◽  
Triethylene Glycol ◽  
Natural Gas Dehydration

scholarly journals Design and Analysis of a Distributed Water Heat Pump System for Near- and Net-Zero Energy Commercial Buildings

2021 ◽  
Author(s):  
Maudud Hassan Quazi
Keyword(s):  
Natural Gas ◽  
Heat Pump ◽  
Cooling Tower ◽  
Heat Pumps ◽  
Base Case ◽  
Hvac System ◽  
Pump System ◽  
Heat Pump System ◽  
Heating And Cooling ◽  
Net Zero

This objective of this project is to determine the energy and environmental potential of distributed common loop water source heat pump system in a near or net-zero commercial office building, which has simultaneous heating and cooling load in winter and shoulder seasons. It is expected that the perimeter zones will have heating demand during those months, while the core zones will have consistent cooling demand throughout the year. The motive is to reclaim the rejected heat from the cooling operation and transfer it to the zones requiring heating. The building under study is a 60,000 ft2 three storey commercial office building, which has private offices along the perimeter, and open work area in the core. In the first part of the analysis, the base building has been modelled and simulated to the minimum requirements of ASHRAE 90.1-Energy Standard for Buildings except Low-Rise Residential Buildings using simulation software eQuest 3.65. The Heating Ventilation and Airconditioning (HVAC) system used is four-pipe fan coil system serving individual zones. The fan coil units use a centralized natural gas boiler and a variable capacity centrifugal chiller as external source of heating and cooling respectively. The base case consumes a total of 524.54 x 1000 kWh of electricity and 1,056 million Btu of natural gas annually. The second part is the modelling and simulation of a proposed case, which uses the same building envelope, occupancy, lighting and equipment as the base case. The HVAC system used is a distributed common loop heat pump system connected to a cooling tower for heat rejection, and a condensing boiler for heat addition. During the occupied hours, when simultaneous cooling and heating loads exist in the building, the cooling zone heat pumps rejects exhaust heat into the common loop, and the heat is subsequently used by the heat pumps operating in heating mode. Using this method, the heat pump system reduces its dependence on the cooling tower and the boiler, which only operate to maintain the loop temperature in an acceptable range. There is 9,510 kWh (1.81%) increase in electricity consumption by proposed case comparing to the base building. Natural gas consumption has been reduced by 353.65 million Btu (33.48%). Annual utility bill has increased by $1,483.00 which is 1.88% higher than the base case. 15.7 tonnes of greenhouse gas can be reduced if the proposed case is adopted.

scholarly journals Technical and economic evaluation of triethylene glycol regeneration process using flash gas as stripping gas in a domestic natural gas dehydration unit

2020 ◽  
Vol 2 (5) ◽  
Author(s):  
Sony A. Affandy ◽  
Adhi Kurniawan ◽  
Renanto Handogo ◽  
Juwari P. Sutikno ◽  
I‐Lung Chien
Keyword(s):  
Economic Evaluation ◽  
Natural Gas ◽  
Triethylene Glycol ◽  
Regeneration Process ◽  
Natural Gas Dehydration
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