Abstract
Pipeline transportation is the major way to transport natural gas. How to reduce energy dissipation and retain the gas delivery capacity are the main problems of pipeline transportation. In this article, a new drag reduction agent named CPA is synthesized. An experimental investigation on the roughness-reducing effect of CPA on the inner surface of the pipeline is carried out. The effect of CPA on natural gas flow regime in the near-wall region of the pipeline is researched with Fluent software. Field tests for calculating the drag reduction rate of CPA are performed. The results show that CPA can reduce the roughness of the inner surface effectively, and the maximum roughness-reducing percentage is 38.74%. Meanwhile, CPA can reduce the frictional drag and thereby improve transportation capacity of pipelines. After injecting CPA, the streamline of the natural gas in the near-wall region is more consistent. The velocity fluctuation decreases by 93.2%. The mean turbulence intensity decreases by 53.01%. The pipeline pressure further decreases the roughness of the inner surface of the pipeline. The field test shows that the maximum drag reduction rate of CPA is 25%, and it is suitable for application in gathering and transportation pipelines of high flow velocity and turbulent rough region.
Highlights
As a kind of clean and efficient high-quality energy resource, natural gas is the first choice to improve energy structure and to protect environment worldwide
In order to further reduce the frictional resistance and improve gas delivery capacity, based on the aforementioned research, a new drag reduction agent (DRA) named carboxylate polymer agent (CPA) was synthesized, and the effects of CPA on roughness of the inner surface of the pipeline, natural gas flow regime in the near-wall region, and drag reduction of natural gas pipeline transportation are researched in this article
The result of the roughness of inner surfaces of specimens is listed in Table 2: 1. CPA can reduce the roughness of the inner surface of the pipeline effectively
Summary
As a kind of clean and efficient high-quality energy resource, natural gas is the first choice to improve energy structure and to protect environment worldwide. In order to further reduce the frictional resistance and improve gas delivery capacity, based on the aforementioned research, a new DRA named carboxylate polymer agent (CPA) was synthesized, and the effects of CPA on roughness of the inner surface of the pipeline, natural gas flow regime in the near-wall region, and drag reduction of natural gas pipeline transportation are researched in this article. Effect of CPA on roughness of the inner surface of the pipeline
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