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Research on Heat Transfer Characteristics and Numerical Simulation of Oil Shale In-situ Pyrolysis Heater with Spiral Baffle
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College of Construction Engineering, Jilin University,College of Construction Engineering, Jilin University,College of Construction Engineering, Jilin University,Shandong Provincial Geo-mineral Engineering Exploration Institute,College of Construction Engineering, Jilin University,College of Construction Engineering, Jilin University,College of Construction Engineering, Jilin University

Clc Number:

P618.12

Fund Project:

This study was supported by grants from the Development and Reform Commission of Jilin Province about the demonstration project of thousand-ton oil shale in Jilin Province, the Cooperative Program between Universities and Jilin Province about the demonstration project of oil shale in-situ exploitation (SF2017-5-1), the Program for JLU Science and Technology Innovative Research Team (2017TD-13), the Fundamental Research Funds for the Central Universities.

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    Abstract:

    The ultimate aim of the oil shale in-situ pyrolysis technology is to heat the oil shale to the state of pyrolysis. Direct heating, which can be realized by heating in the well to achieve the highest energy utilization rate with the smallest heat loss, has become the main heating way of the in-situ pyrolysis. In this paper, a new type of downhole heater with spiral baffle is developed, and due to the spiral continuos distribution, the contact time of gas and heating rod can be effectively prolonged to remarkably increase the heat transfer coefficient of heat rod surface. This paper also focuses on surface heat transfer characteristics of the in-situ pyrolysis heater with spiral baffle. Through the numerical simulation and theorecical deduction, the effects of the spiral baffle’s pitch and the gas mass flow on the heat transfer coefficient of the heating rod surface is analyzed, it is concluded that the smaller the pitch of the baffle or the larger the gas mass flow the higher the heat transfer coefficient of the heating rod; in the meanwhile, the fitting equations for heat transfer coefficient of heating rod surface changing with the pitch and gas mass flow are obtained to provide the theoretical support for the following-up design of the heater with spiral baffle.

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History
  • Received:February 01,2018
  • Revised:February 01,2018
  • Adopted:June 28,2018
  • Online: August 07,2018
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