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Open AccessArticle

Conversion of Low-Grade Heat from Multiple Streams in Methanol to Olefin (MTO) Process Based on Organic Rankine Cycle (ORC)

by Danchen Wei 1,2, Cheng Liu 1,2 and Zhongfeng Geng 1,2,*
1
Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China
2
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(10), 3617; https://doi.org/10.3390/app10103617
Received: 21 March 2020 / Revised: 24 April 2020 / Accepted: 25 April 2020 / Published: 23 May 2020
The organic rankine cycle (ORC) has been widely used to convert low-grade thermal energy to electricity. The selection of the cycle configuration, working fluid, and operating parameters is crucial for the economic profitability of the ORC system. In the methanol to olefin (MTO) process, multi-stream low-temperature waste heat has not been effectively utilized. The previous study mostly focused on the optimization of a single stream system and rarely considered the comprehensive optimization of multi-stream ORC systems which have multi-temperature heat sources. This paper proposes five kinds of system design schemes, and determines the optimal output work and the highest exergy efficiency through the selection of working fluid and optimization of system parameters. In addition, the influence of mixed working fluid on the thermodynamic performance of the system was also investigated. It is found that there is an optimal evaporation temperature due to the restriction of pinch temperature. At the optimal temperature the ORC system obtains the maximum net output power of 4.95 MW. The optimization results show that the working fluid R227EA selected from seven candidate working fluids shows the optimal thermodynamic performance in all the five design schemes, and obtains the maximum output work and exergy efficiency. View Full-Text
Keywords: ORC; MTO; multi-stream waste heat; heat recovery; zeotropic mixtures ORC; MTO; multi-stream waste heat; heat recovery; zeotropic mixtures
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MDPI and ACS Style

Wei, D.; Liu, C.; Geng, Z. Conversion of Low-Grade Heat from Multiple Streams in Methanol to Olefin (MTO) Process Based on Organic Rankine Cycle (ORC). Appl. Sci. 2020, 10, 3617.

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