Increasing the efficiency of thermal energy use at the thermal technology section of ethylene production

RELEVANCE. The issues of efficient use of fuel and energy resources in the industrial sector of the Russian Federation have been topical for the last decades, which is confirmed by the issuance of various legislative acts and regulatory documents at the federal and regional levels. The structure of energy complexes of operating organic synthesis enterprises was formed in conditions of interconnection with external systems of energy resources supply in the period of their low internal prices. These factors have caused the low system energy efficiency of technological complexes at the present time and the need for a systematic approach to the prospective planning of energy development directions of operating enterprises. In accordance with the strategy of development and modernization of the fuel and energy complex of Russia, the directions of development of energy supply systems of organic synthesis enterprises are defined in the areas of resource conservation and creation of energy technological complexes based on efficient sources of electricity and heat supply under the conditions of improvement of the main technological processes.

THE PURPOSE. The purpose of this work is to study the heat-consuming technological units of the ethylene production line for the efficient use of thermal energy. Determine the energy saving potential and develop measures to optimize heat consumption at the considered production site.

METHODS. In this work we have studied the operation of feed water preparation unit, steam condensate pumping unit, pyrolysis gas (pyrogas) washing unit, dilution steam preparation unit of ethylene production pyrolysis section within the framework of energy inspection of the enterprise as a whole. As a result of the survey, heat losses in technological sections were assessed, material balance of technological flows was drawn up, and possible reserves of heat energy saving were determined.

CONCLUSION. It is determined that the use of heat discharged to the feed water alkaline flushing unit for heating of partially clarified water supplied to the deaerator with the installation of an additional heat exchanger at the feed water preparation and condensate pumping section will save water steam with pressure of 3.5 kgf/cm² and recycled water. At the section of water washing of pyrolysis gas, heat energy saving can be achieved by increasing the heat exchange coefficient by removing hydrocarbons from the dilution steam condensate. For the dilution steam preparation section a scheme solution is proposed, aimed at using the energy potential of steam-condensate mixture of heating steam by introducing a steam ejector unit behind the heat exchanger. The offered scheme will allow to receive economic effect 6400 Gcal/year, that in monetary terms will make 5120 thousand rubles/year, and payback period 1,2 years.

1. Jing-Ming Chen, Biying Yu, Yi-Ming Wei, Energy technology roadmap for ethylene industry in China, Applied Energy, Volume 224, 2018, Pages 160-174.

2. Yongming Han, Hao Wu, Zhiqiang Geng, Qunxiong Zhu, Xiangbai Gu, Bin Yu, Review: Energy efficiency evaluation of complex petrochemical industries, Energy, Volume 203, 2020, 117893.

3. Amaral F, Santos A, Calixto E, Pessoa F, Santana D. Exergetic Evaluation of an Ethylene Refrigeration Cycle. Energies. 2020; 13(14):3753. https://doi.org/10.3390/en13143753

4. Shuguang Xiang, Lili Wang, Yinglong Wang, Rongshan Bi, Li Xia, Xiaoyan Sun, Exploration of gradient energy-saving separation processes for ethylene glycol mixtures based on energy, exergy, environment, and economic analyses, Separation and Purification Technology, Volume 279, 2021, 119787. doi.org/10.1016/j.seppur.2021.119787

5. Anton A. Kiss, Robin Smith, Rethinking energy use in distillation processes for a more sustainable chemical industry, Energy, Volume 203, 2020, 117788. doi.org/10.1016/j.energy.2020.117788

6. Kentaro Hirata, Hiroyuki Kakiuchi, Energy saving for ethylene process by Adsorption Heat Pump, Applied Thermal Engineering, Volume 31, Issue 13, 2011, Pages 2115-2122. doi.org/10.1016/j.applthermaleng.2011.03.031

7. Energy technology combination system for the high-temperature section of dehydrogenation of isoamylenes into isoprene Balzamov D.S., Konakhina I.A. Bulletin of the Kazan State Energy University. 2010. №. 1 (4). p. 16-25.

8. Thermodynamic analysis of a system for collecting and reusing condensate Konakhina I.A., Konakhin A.M., Shinkevich O.P. Bulletin of Ivanovo State Energy University. 2011. №. 2. p. 11–14.

9. Levin M.S. Use of exhaust and secondary steam and condensate. M.: Energy, 1971

10. Balzamov D., Akhmetova I., Bronskaya V., Kharitonova O., Balzamova E. Optimization of Thermal Conditions of Heat Recovery Boilers with Regenerative Heating in the High-Temperature Section of Isoamylene Dehydrogenation. International Journal of Technology 2020, 11(8), 1598-1607.

11. System for reusing steam condensate of a petrochemical enterprise in conditions of its non-return to the source / I. A. Konakhina, A. M. Konakhin, E. A. Akhmetov, A. I. Fazullina // News of higher educational institutions. Energy problems. – 2009. – №. 5-6. – P. 18-25.

12. Zatsarinnaya Y., Logacheva A., Gainullin R., et al. Solution for renewable future// E3S Web of Conferences. 2019. Vol. 124, p.04010.

13. Balzamov D.S., Balzamova E.Yu., Bronskaya V.V., Oykina G.I., Rybkina E.A., Shaikhetdinova R.S., Kharitonova O.S. The beneficial using the heat of the exhaust gases of the furnaces of the technological unit for the ethylene oxide production (2020) IOP Conference Series: Materials Science and Engineering 2020, 862(6), 062044. doi 10.1088/1757-899X/862/6/062044

14. Balzamov D.S. Comparative analysis of two methods of energy-technological combination of high-temperature section / D. S. Balzamov // News of higher educational institutions. Energy problems. – 2009. – No. 3-4. – p. 151-156

15. Zatsarinnaya Yu. N., Reutin G. V., Kurilov S.S., Isaeva O.V., Kovalev G.S. Forecasting electricity generation from renewable energy sources using machine learning methods // News of higher educational institutions. ENERGY PROBLEMS. 2023

16. Influence of Temperature on the Thermal Properties of the Core Material - the Coefficient of Temperature Conductivity, Specific Heat Capacity, Thermal Conductivity / E. Burlutsky, D. Balzamov, V. Bronskaya [et al.] // International Journal of Technology. – 2023. – Vol. 14, №. 2. – P. 443. – DOI 10.14716/ijtech.v14i2.6009.

17. Local Heat Transfer Dynamics in the In-Line Tube Bundle under Asymmetrical Pulsating Flow / A. Haibullina, A. Khairullin, D. Balzamov [et al.] // Energies. – 2022. – Vol. 15, No. 15. – P. 5571. – DOI 10.3390/en15155571.

18. Temperature Dependence of the Kinetic Parameters of the Titanium–Magnesium Catalyzed Propylene Polymerization / V. Bronskaya, G. Manuyko, G. Aminova [et al.] // Polymers. – 2022. – Vol. 14, No. 23. – P. 5183. – DOI 10.3390/polym14235183.