Research Of Flue Gas Heat Recovery Of Engines For Offshore Oil Production Facilities

This paper presents the theoretical analysis and on-site testing on the thermal performance process of the waste heat recovery boiler for offshore oil production facilities. Heat recovery is the great way for enhancing the efficiency of energy resources of CNOOC. The thermal and electric energy of offshore oil production facilities are supported by oil or natural gas exploited by local oil field. The flue gas temperature of electric engines is about 400℃, and the temperature heating system of offshore oil production facilities is less than 160℃. So, the waste heat resource of electric engines can be used to displace the thermal boilers.In this paper, three thermal dynamics systems are analyzed and the open Brayton system is choosed to study the waste heat recovery of engines of offshore oil production facilities. The paper optimizes the waste heat recovery of engines under the same engine with different charges. At the same time, for the spacious limited of offshore oil production facilities the fan is deleted. Then these changes of thermal dynamics paramerers are researched in the paper. Also, the e conomic analysis of waste heat recovery engines of offshore oil production facilities is studied. These results show that waste heat recovery is a great way to reduce energy consumption and cost saving with and without fans. While, if the space of offshore oil production facilities is permitted, energy consumption and cost saving are better with fans.The heat transfer of waste heat recovery boilers is studied in this paper by Fluent. For improving heat transfer strength, the heat exchange coil is straight welded spiral pipes. The computing result shows that thermal power of the waste heat recovery boiler is less than the real value without thinking about radiation heat transfer. In order to calculate the thermal power of the waste heat recovery boiler, a numerical model is developed to simulate combined convection and radiation heat transfer in a 2D square cavity.In practical engineering, the flue gas flow is difficult to be measured by instruments. The paper uses theoretical marithmetic and experiment methods to analyze the accurate flow of flue gas. The paper utilizes product of combustion theoretical mothod of boilers to calculate flue gas flow of diesel engines or gas turbines.To engines of offshore oil production facilities, the excess air factor is enlarged because the needed air of gas turbine o r diesel and the calculated figures of the excess air facto rare manufactured.According to the research, these results can make first-phase preparations for the future waste heat resource of electric engines of offshore oil production facilities.