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Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A method of extracting exhaust waste heat and heating inlet wellhead by glycol wall heat exchange technology is proposed. Calculation and system design of exhaust air waste heat based on heat balance theory, combined with the actual case of Ningxia Yindonggou Coal Mine project, the Threlkeld enthalpy difference method was used to develop an analytical model for single tube heat transfer under wet conditions and to optimize the operating conditions. The results show that the glycol inter-wall heat transfer technology can extract the heat from the mine return air and meet the heat load required to prevent freezing at the wellhead. The system operates stably when the inlet temperature of the heat transfer medium in the tube is -2 ℃ and the flow rate is 1.49 m/s to 2.76 m/s. When the outdoor temperature is below -15 ℃, the wellhead temperature can still reach above 5 ℃.

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Control Theory & Applications / Kongzhi Lilun Yu Yinyong is the property of Editorial Department of Control Theory & Applications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)