Optimization of the technological parameters of the heat recovery system of a boiler plant with the air protection method of gas water tracts
DOI:
https://doi.org/10.31548/energiya2022.06.005Abstract
The results of a study of the efficiency and optimization of technological parameters of the heat recovery system of a boiler plant, in which the method of mixing part of the heated air into the flue gases after the heat recovery unit, is implemented. The essence of the air method is to increase the temperature and decrease the relative humidity of the resulting mixture, which reduces the amount of condensate on the walls of the exhaust ducts. A gas-consuming boiler plant with a heat recovery system for heating heat supply water is considered. To optimize the technological parameters of the system in the implementation of this method, a complex technique based on exergy analysis was used. The technique combines structural-variant methods and balance integral methods of exergy analysis. This allows you to determine the exergy, heat engineering and technological characteristics that are included in the criteria for evaluating the efficiency of heat recovery systems. Due to the small number of parameters required for the calculation, and the simplicity of the calculation and analytical methods for obtaining exergy characteristics, the technique is convenient for research. The accuracy of the results obtained is 0.3-0.5%. A block diagram of a boiler plant with a heat recovery system in the implementation of the mixing method is given. In the block diagram, input and output excretory flows between individual elements are identified. The criteria for evaluating the efficiency of heat recovery and the main technological optimization parameters have been selected. Based on the general system of exergy, thermal and material balance equations in accordance with the structural scheme, an exergy balance equation was compiled, from which exergy losses and heat-exergy efficiency criteria were determined. The optimal values in the heat exchanger heat output and the amount of mixed air, which correspond to the high efficiency of the system, are determined.
Key words: parameter optimization; exergy efficiency; mixing method; gas ducts
References
Sahin, A. Z. (2014) Importance of Exergy Analysis in Industrial Processes. URL: https: // www. researchgate. net / publication / 228988818.
Hajjaji, N., Pons, M.-N., Houa,s А., Renaudin, V. (2012) Exergy analysis: An efficient tool for understanding and improving hydrogen production via the steam methane reforming process. Energy Policy, 42, 392-399. doi.org/10.1016/j.enpol.2011.12.003.
Cziesla, F., Tsatsaronis, G., Gao, Z. (2006) Avoidable thermodynamic inefficiencies and costs in an externally fired combined cycle power plant // Energy, 31 (10–11), 1472-1489. doi.org/10.1016/j.energy.2005.08.001
Yuan Yuan Jian, Shao Xiang Zhou. (2010). Exergy Analysis of Boiler Based on the Temperature Gradient. Asia-Pacific Power and Energy Engineering Conference.Paper # 11258018, 4. doi.org/10.1109/APPEEC.2010.5449523
Zare, V., Moalemian, A. (2017). Parabolic trough solar collectors integrated with a Kalina cycle for high temperature applications. Energy, exergy and economic analyses. Energy Conversion and Management, 151.681-692. [Link] [DOI:10.1016/j.enconman.2017.09.028].
Mohammad Ameri, Pouria Ahmadi, Armita Hamidi. (2008). Energy, exergy and exergoeconomic analysis of a steam power plant: A case study. International Journal of Energy Research, 33 ( 5), 499 - 512. https://doi.org/10.1002/er.1495.
Fialko, N., Stepanova, A., Navrodska, R., Meranova, N., Sherenkovskii, J. (2018). Efficiency of the air heater in a heat recovery system at different thermophysical parameters and operational modes of the boiler. Eastern-European Journal of Enterprise Technologies, 6/8 (96), 43-48. doi: 10.15587/1729-4061.2018.147526.
Fialko, N., Stepanova, A., Navrodskaya, R., Presich, G. (2019). Localization of exergy losses in the air heater of the heat-recovery system under different boiler operating modes. "International scientific journal "Internauka", 12 (74), 30.
Fialko, N., Stepanova, A., Navrodskaya, R., Novakovsky, M. (2019). Study of the efficiency of a combined heat utilization system using the graph theory methods. International scientific journal "Internauka", 15 (1), 61–63.
Fialko, N., Stepanova, A., Navrodska, R., Meranova, N. (2020). Arget functions of optimization of heat recovery systems. International scientific journal "Internauka", 1/3 (83), 23-27.
Stepanova, A. (2016). Analiz rabotosposobnosti ustanovki s kombinirovannoy teploutilizatsionnoy sistemoy dlia podogreva vody i dutevogo vozdukha kotloagregata [Analysis of the application combined heat recovery systems for water heating and blast air of the boiler unit]. Industrial Heat Engineering, 38(4), 38-46. DOI: https://doi.org/10.31472/ihe.4.2016.06.
Fialko, N., Stepanova, A., Navrodska, R., Gnedash, G., Shevchuk, S. (2021). Complex metods for analysis of efficiency and optimization of heat-recovery system. Scientific and innovation, 2021.17(4), 11-18. Doi.org/ 10.15407/scine17.04.011 ISSN 1815-2066.
Stepanova, A. (2016). Analiz rabotosposobnosti ustanovki s kombinirovannoy teploutilizatsionnoy sistemoy dlia podogreva vody i dutevogo vozdukha kotloagregata [Analysis of the application combined heat recovery systems for water heating and blast air of the boiler unit]. Industrial Heat Engineering, 38(4), 38-46. DOI: https://doi.org/10.31472/ihe.4.2016.06.
Fialko, N., Stepanova, A., Navrodska, R., Shevchuk, S. (2021). Comparative analysis of exergetic efficiency of methods of protection of gas exhaust tracks of boiler installations Eastern-European Journal of Enterprise Technologies, 3/8 (111), 42-49. Doi 1015587/1729. 4061.2021/234026 ISSN 1729-3774 4061.2021/234026.
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