Experimental Research on the Drag Reduction Mechanism of Natural Gas Drag Reduction Agent and Its Industrial Field Test

2014 ◽  
Vol 53 (31) ◽  
pp. 12494-12501 ◽  
Author(s):  
Zhiqiang Huang ◽  
Zhen Chen ◽  
Qin Li ◽  
Ronggai Zhu ◽  
Shuang Jing ◽  
...  
Keyword(s):  
Natural Gas ◽  
Drag Reduction ◽  
Field Test ◽  
Experimental Research ◽  
Reduction Mechanism ◽  
Gas Drag

Study on Natural Gas Drag Reduction Agent and Mechanism of Gas Pipelines Drag Reduction

2008 ◽  
Author(s):  
Guoping Li ◽  
Zhiheng Zhang ◽  
Bing Liu ◽  
Chunman Li ◽  
Weichun Chang ◽  
...  
Keyword(s):  
Natural Gas ◽  
Drag Reduction ◽  
Reduction Method ◽  
Radial Pulsation ◽  
Gas Pipelines ◽  
Oil Pipelines ◽  
Oil Flow ◽  
Pipeline Wall ◽  
Gas Drag ◽  
Long Chain

On the basis of the study on the principle of oil flow and that on mechanism of drag reduction and transportation promotion of oil pipelines, the article makes a further research on the Mechanism of Drag Reduction in the gas pipelines. It points out that the basic cause for gas pipelines drag reduction is to control effectively the radial pulsation of gas adjacent to pipeline wall. It is considered that the most effective drag reduction method is to reduce the pipeline wall’s roughness degree and pipeline wall’s undercoat and to make gas drag reduction agent adjacent to pipeline wall. The research shows that gas drag reduction agent should be a polymer and compound with polarity and nonpolarity long chain.

Synthesis, Performance Evaluation and Field Application of Polymer-Type Natural Gas Drag Reduction Agent

2012 ◽  
Author(s):  
Haihong Xu ◽  
Yanqing Gao ◽  
Guoping Li ◽  
Zhiheng Zhang ◽  
Weichun Chang
Keyword(s):  
Natural Gas ◽  
Drag Reduction ◽  
Radial Pulsation ◽  
Polar Group ◽  
Gas Pipelines ◽  
Natural Gas Pipelines ◽  
Increase Rate ◽  
Gas Drag ◽  
Polymer Type ◽  
Long Chain

Natural gas is gaining popularity in the world as a high quality, clean burning alternative to oil and coal. The Mechanism of Drag Reduction in the natural gas pipelines is to control the radial pulsation of gas adjacent to pipeline wall effectively. The way to lower the pulsation intension of the gas in the thin layer along the wall is to use gas drag reduction agents, whose polar end absorbs fixedly to the surface and whose non-polar long chain suspends in natural gas so as to have a function of restraining the gas’ radial pulsation. The drag reduction agent molecule absorbed to the protruding is mainly to weaken the gas pulsation producing by virtue of roughness degree. The drag reduction agent molecule absorbed to and collected in the dents also has the function of lowering the equivalent roughness degree of the wall surface. A polymer-type natural gas drag reduction agent with polarity as well as nonpolarity long chain was studied. We synthesized polymers that contain long chain fatty acid (F) or long chain ester (E) as soft chain, and alkoxy residues or acylations as polar group, then studied the effects of this polymer-type gas drag reduction agent on the pipe wall, natural gas quality, station processes and equipments as well as post-processing. A test loop with control software was developed for evaluating natural gas drag reduction agents. An on-line injected system for natural gas reduction agent was established. The product was applied on natural gas pipelines in China. In No.1 oil production plant of Changqing oilfield, the drag reducing efficiency is 19.5%, and the flow increase rate is 12.4%. In pipeline from Lanzhou to Yinchuan, the drag reducing efficiency is all above 10%, and the flow increase rate is all above 5%.

Drag Reduction Study about Bird Feather Herringbone Riblets

2013 ◽  
Vol 461 ◽  
pp. 201-205 ◽  
Author(s):  
Hua Wei Chen ◽  
Fu Gang Rao ◽  
De Yuan Zhang ◽  
Xiao Peng Shang
Keyword(s):  
Drag Reduction ◽  
Structural Parameters ◽  
Reduction Rate ◽  
Reduction Mechanism ◽  
Surface Drag ◽  
Flight Feather ◽  
Hollow Shaft ◽  
Smooth Edge ◽  
Bird Feather ◽  
Wild Goose

Flying bird has gradually formed airworthy structures e.g. streamlined shape and hollow shaft of feather to improve flying performance by millions of years natural selection. As typical property of flight feather, herringbone-type riblets can be observed along the shaft of each feather, which caused by perfect alignment of barbs. Why bird feather have such herringbone-type riblets has not been extensively discussed until now. In this paper, microstructures of secondary feathers are investigated through SEM photo of various birds involving adult pigeons, wild goose and magpie. Their structural parameters of herringbone riblets of secondary flight feather are statistically obtained. Based on quantitative analysis of feathers structure, one novel biomimetic herringbone riblets with narrow smooth edge are proposed to reduce surface drag. In comparison with traditional microgroove riblets and other drag reduction structures, the drag reduction rate of the proposed biomimetic herringbone riblets is experimentally clarified up to 15%, much higher than others. Moreover, the drag reduction mechanism of herringbone riblets are also confirmed and exploited by CFD.

scholarly journals Software and Instrumentation to Monitor the Performance of Natural Gas Pipeline Turbine Systems

1987 ◽  
Author(s):  
Philip Levine ◽  
Daniel Patanjo ◽  
Wilkie Pak Lam
Keyword(s):  
Performance Evaluation ◽  
Natural Gas ◽  
Monitoring System ◽  
Field Test ◽  
Gas Turbines ◽  
Gas Pipeline ◽  
Test Results ◽  
Improve Performance ◽  
Natural Gas Pipeline ◽  
Research Institute

Software for monitoring and evaluating the performance of gas turbines is being developed under the auspices of Gas Research Institute (GRI). Reference [1] provides an overview of the GRI project. This paper describes the PEGASUS software and monitoring system. PEGASUS is an acronym for Performance Evaluation of GAS Users Systems. Field test results, on multi-shaft turbines used in the gas pipeline industry, have demonstrated the potential of the software. The software and instrumentation, can help identify maintenance and upgrade actions to improve performance.

Experimental Research on the Drag Reduction Technology of Nature Gas Pipeline Transportation

2011 ◽  
Vol 361-363 ◽  
pp. 982-989 ◽  
Author(s):  
Zhi Qiang Huang ◽  
Rong Gai Zhu ◽  
Zhen Chen ◽  
Xue Yuan Li ◽  
Shuang Jing ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Natural Gas ◽  
Drag Reduction ◽  
Flow Pattern ◽  
Flow Resistance ◽  
Gas Pipeline ◽  
Wall Region ◽  
Low Carbon ◽  
Pipeline Transportation ◽  
Inner Surface

As an efficient and environment-friendly energy, natural gas has become an inevitable choice for improving environment, achieving the low carbon economy and the sustainable development all around world. However, flow resistance produced in the course of the gas pipeline transportation caused large loss of transportation energy and brought down the transportation capacity. Therefore, this paper have developed a deep researches on the interaction mechanism between a drag reduction agent (DRA) and the inner surface of natural gas pipeline, the flow pattern improvement regularity about DRA membrane acting on the near-wall region of the pipeline, the relation between the flow pattern improvement and friction resistance, the effect regularity of DRA on the friction coefficient of the pipeline inner surface, and the relation between the alternation of the friction coefficient and the drag reduction. According to all above studies, the fundamental reason for flow resistance of the gas transportation has been found, and the drag reduction mechanism of the gas pipeline transportation has also been hold of. Field test shows that the application of the DRA in the course of the gas pipeline transportation reduced the friction loss by 12%-16.5%, and raised the transfer efficiency by 8%-12%.

Landfill Gas Application Development of the Caterpillar G3600 Spark-Ignited Gas Engine

1995 ◽  
Vol 117 (4) ◽  
pp. 820-825 ◽  
Author(s):  
G. P. Mueller
Keyword(s):  
Natural Gas ◽  
Field Test ◽  
Landfill Gas ◽  
Engine Performance ◽  
Development Work ◽  
Fuel System ◽  
Application Development ◽  
Gas Engine ◽  
Performance Development ◽  
Simulated Landfill

A G3600 engine was developed to operate on landfill gas to demonstrate engine performance and identify any operational problems caused by this application. Fuel system and engine performance development were completed using simulated landfill gas containing carbon dioxide and natural gas at the Caterpillar Technical Center. The engine was packaged as a generator set and has operated for 12,000 hours on landfill gas. Engine performance goals similar to those for G3600 natural gas applications were achieved during development and were attained during the field test. Development work and field test endurance results are presented in this paper.

Experimental study of drag-reduction mechanism for a dilute surfactant solution flow

2008 ◽  
Vol 51 (3-4) ◽  
pp. 835-843 ◽  
Author(s):  
Feng-Chen Li ◽  
Yasuo Kawaguchi ◽  
Bo Yu ◽  
Jin-Jia Wei ◽  
Koichi Hishida
Keyword(s):  
Experimental Study ◽  
Drag Reduction ◽  
Surfactant Solution ◽  
Reduction Mechanism ◽  
Solution Flow
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