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4. Study on key performance parameters of hydro-pneumatic tensioner for top tensioned riser

Author

Xu Lixin, Yang Yu, Hao Shuai, Han Wu, Chen Baiquan, Yu Jianxing, and Wu Chen

Subjects
Piping, Materials science, Tension (physics), 020101 civil engineering, Ocean Engineering, 02 engineering and technology, Mechanics, Piston rod, 01 natural sciences, 010305 fluids & plasmas, 0201 civil engineering, law.invention, Piston, Volume (thermodynamics), law, High pressure, 0103 physical sciences, Compressibility, Hydraulic fluid
Abstract

In this paper an improved mathematical model of a hydro-pneumatic tensioner (HPT) system for top tensioned riser (TTR) is derived by consideration of friction, mass of piston and piston rod, tension loss in hydraulic oil piping, and compressibility of hydraulic oil. The vertical motion of the riser string is also considered. Subsequently, the proposed detailed model and the conventional simplified model are comparatively studied. Finally, the tension characteristic and performance parameters of the HPT are analyzed based on the proposed model. Results show that the conventional simplified model indeed overestimates the tension of tensioner as it neglects some performance parameters resulting in tension loss. The diameters of piston and piston rod and the initial pressure of high pressure (HP) gas have the most significant influence on the tension of the tensioner. The initial volume of HP gas and the initial pressure of low pressure (LP) gas also have some impact. The influence of the initial volume of LP gas and the inner diameter and length of the piping is relatively small. The research has some reference value for HPT and TTR design.

Published
2019

7. A new method for producing high melt strength polypropylene with reactive extrusion

Author

Tang, Hongxia, Dai, Wenli, and Chen, Baiquan

Subjects
Polypropylene -- Production processes -- Chemical properties -- Research -- Methods, Fourier transform infrared spectroscopy -- Methods -- Research -- Chemical properties, Polymers -- Rheology, Plastics -- Extrusion, Engineering and manufacturing industries, Science and technology, Production processes, Chemical properties, Research, Methods
Abstract

A high-melt-strength polypropylene (HMSPP) was prepared using a twin-screw reactive extruder from a commercial isotactic polypropylene through two stages, first, maleic anhydride is grafted to polypropylene to obtain a maleic anhydride-grafted polypropylene (PP-g-MA), and then the grafted polymer is reacted with epoxy to extend the branched chain. Fourier transformed infrared spectroscopy indicated that ma leic anhydride was grafted on polypropylene and reacted with epoxy. Melt flow rate and sag resistance test showed that the melt strength of the HMSPP improved considerably. Differential scanning calorimetry test showed that the long chain branches (LCBs) act as a nucleating agent in the crystallization of the HMSPP, which leads to a high crystallization temperature and crystallinity. Furthermore, the LCB efficiency of the HMSPP can also be calculated by analyzing its rheological property. POLYM. ENG. SCI., 48:1339-1344, 2008. (C) 2008 Society of Plastics Engineers, INTRODUCTION Isotactic polypropylene has many desirable and beneficial physical properties such as high mechanical strength, inertness to various chemical reagents, nontoxicity, high transparency, high glossiness, and so forth. However, as [...]

Published
2008

8. Biobutanol from Renewable Agricultural and Lignocellulose Resources and Its Perspectives as Alternative of Liquid Fuels

Author

Mária Szilágyi, Chen Baiquan, Li Zhibin, Vinita Sharma, László Kótai, János Szépvölgyi, and Pradeep Sharma

Subjects
business.industry, Butanol, Industrial production, Pulp and paper industry, Renewable energy, chemistry.chemical_compound, Wastewater, chemistry, Biofuel, Carbon dioxide, Bioreactor, Environmental science, Fermentation, business
Abstract

Biobutanol (n-C4H9OH, available as fermentation product of various carbohydrate derivatives obtained from different resources of agricultural production such as crops and wastes) is one of the most promising biofuels in the near future. It can be produced by the so-called ABE (acetone-butanol-ethanol) type anaerobic fermentation discovered by Pasteur [1, 2] and industrialized by Weizmann [3]. Main problems associated with industrial production of biobutanol include high energy demand for processing of dilute ferment liquors and high volume of wastewater. A bioreactor with a volume of 100 m3 produces at 90% filling ratio 1053 kg of butanol, 526 kg of acetone and 175 kg of ethanol together with 2900 kg of carbon dioxide, 117 kg of hydrogen and 84150 kg of wastewater. Efforts to increase productivity and decrease production costs resulted in many new methods. This chapter summarizes some selected results on methods of biobutanol production.

Published
2013

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