Performance evaluation of an improved biomass-fired cogeneration system simultaneously using extraction steam, cooling water, and feedwater for heating

Abstract

An advanced cogeneration system based on biomass direct combustion was developed and its feasibility was demonstrated. In place of the traditional single heat source (extraction steam), the extraction steam from the turbine, the cooling water from the plant condenser, and the low-pressure feedwater from the feedwater preheating system were collectively used for producing district heat in the new scheme. Hence, a remarkable energy-saving effect could be achieved, improving the overall efficiency of the cogeneration system. The thermodynamic and economic performance of the novel system was examined when taking a 35 MW biomass-fired cogeneration unit for case study. Once the biomass feed rate and net thermal production remain constant, an increment of 1.36 MW can be expected in the net electric production, because of the recommended upgrading. Consequently, the total system efficiency and effective electrical efficiency augmented by 1.23 and 1.50 percentage points. The inherent mechanism of performance enhancement was investigated from the energy and exergy aspects. The economic study indicates that the dynamic payback period of the retrofitting project is merely 1.20 years, with a net present value of 5796.0 k$. In conclusion, the proposed concept is validated to be advantageous and profitable.

Key words： biomass-fired cogeneration; district heat production system; absorption heat pump; extraction steam; cooling water; low-pressure feedwater

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51806062), Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 51821004), and the Fundamental Research Funds for the Central Universities (No. 2020MS006).

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11708-021-0741-4 and is accessible for authorized users.

References

1 Dubey P, Shrivastav V, Maheshwari P H, Recent advances in biomass derived activated carbon electrodes for hybrid electrochemical capacitor applications: challenges and opportunities. Carbon, 2020, 170: 1–29

2 Lo S L Y, How B S, Leong W D, Techno-economic analysis for biomass supply chain: a state-of-the-art review. Renewable & Sustainable Energy Reviews, 2021, 135: 110164

3 Yanli Y, Peidong Z, Wenlong Z, Quantitative appraisal and potential analysis for primary biomass resources for energy utilization in China. Renewable & Sustainable Energy Reviews, 2010, 14(9): 3050–3058

4 Moradi R, Marcantonio V, Cioccolanti L, Integrating biomass gasification with a steam-injected micro gas turbine and an organic Rankine cycle unit for combined heat and power production. Energy Conversion and Management, 2020, 205: 112464

5 Wei R, Zhang L, Cang D, Current status and potential of biomass utilization in ferrous metallurgical industry. Renewable & Sustainable Energy Reviews, 2017, 68: 511–524

6 Ni M, Leung D Y C, Leung M K H, An overview of hydrogen production from biomass. Fuel Processing Technology, 2006, 87(5): 461–472

7 Zhang L, Xu C C, Champagne P. Overview of recent advances in thermo-chemical conversion of biomass. Energy Conversion and Management, 2010, 51(5): 969–982

8 Vassilev S V, Baxter D, Vassileva C G. An overview of the behaviour of biomass during combustion: part I. phase-mineral transformations of organic and inorganic matter. Fuel, 2013, 112: 391–449

9 Cruz N C, Silva F C, Tarelho L A C, Critical review of key variables affecting potential recycling applications of ash produced at large-scale biomass combustion plants. Resources, Conservation and Recycling, 2019, 150: 104427

10 Yang Y, Brammer J G, Wright D G, Combined heat and power from the intermediate pyrolysis of biomass materials: performance, economics and environmental impact. Applied Energy, 2017, 191: 639–652

11 Peltola P, Saari J, Tynjälä T, Process integration of chemical looping combustion with oxygen uncoupling in a biomass-fired combined heat and power plant. Energy, 2020, 210: 118550

12 Huang Y, McIlveen-Wright D R, Rezvani S, Comparative techno-economic analysis of biomass fuelled combined heat and power for commercial buildings. Applied Energy, 2013, 112: 518–525

13 Zhu Y, Li W, Li J, Thermodynamic analysis and economic assessment of biomass-fired organic Rankine cycle combined heat and power system integrated with CO₂ capture. Energy Conversion and Management, 2020, 204: 112310

14 Jang Y, Lee J. Optimizations of the organic Rankine cycle-based domestic CHP using biomass fuel. Energy Conversion and Management, 2018, 160: 31–47

15 Chen H, Wu Y, Xu S, Thermodynamic and economic evaluation of a novel heat supply design using low-pressure feedwater in a cogeneration plant. Applied Thermal Engineering, 2020, 166: 114672

16 Sun J, Fu L, Sun F, Experimental study on a project with CHP system basing on absorption cycles. Applied Thermal Engineering, 2014, 73(1): 732–738

17 Zhang H S, Zhao H B, Li Z L. Performance analysis of the coal-fired power plant with combined heat and power (CHP) based on absorption heat pumps. Journal of the Energy Institute, 2016, 89(1): 70–80

18 Soltani R, Dincer I, Rosen M A. Thermodynamic analysis and performance assessment of an integrated heat pump system for district heating applications. Applied Thermal Engineering, 2015, 89: 833–842

19 Zhu C, Xie X, Jiang Y. A multi-section vertical absorption heat exchanger for district heating systems. International Journal of Refrigeration, 2016, 71: 69–84

20 Li Y, Fu L, Zhang S, A new type of district heating method with co-generation based on absorption heat exchange (co-ah cycle). Energy Conversion and Management, 2011, 52(2): 1200–1207

21 Sun J, Ge Z, Fu L. Investigation on operation strategy of absorption heat exchanger for district heating system. Energy and Building, 2017, 156: 51–57

22 Li Y, Wang W, Ma Y, Study of new cascade heating system with multi-heat sources based on exhausted steam waste heat utilization in power plant. Applied Thermal Engineering, 2018, 136: 475–483

23 Chen H, Xiao Y, Xu G, Energy-saving mechanism and parametric analysis of the high back-pressure heating process in a 300 MW coal-fired combined heat and power unit. Applied Thermal Engineering, 2019, 149: 829–840

24 Ge Z, Zhang F, Sun S, Energy analysis of cascade heating with high back-pressure large-scale steam turbine. Energies, 2018, 11(1): 119

25 Zhao S, Ge Z, He J, A novel mechanism for exhaust steam waste heat recovery in combined heat and power unit. Applied Energy, 2017, 204: 596–606

26 Chen H, Xu J, Xiao Y, An improved heating system with waste pressure utilization in a combined heat and power unit. Energies, 2018, 11(6): 1515

27 Chen H, Wu Y, Xu J, Thermodynamic and economic analyses of reformative design for high back-pressure heating in coal-fueled cogeneration units. Entropy (Basel, Switzerland), 2019, 21(4): 342

28 Li P, Nord N, Ertesvåg I S, Integrated multiscale simulation of combined heat and power based district heating system. Energy Conversion and Management, 2015, 106: 337–354

29 STEAG Energy Services GmbH. EBSILON Professional Documentation. 2020, available at the website of ebsilon.com

30 Wang Z, Wang F, Ma Z, Investigation on the feasibility and performance of transcritical CO₂ heat pump integrated with thermal energy storage for space heating. Renewable Energy, 2019, 134: 496–508

31 Hofmann Beijing Engineering Technology Co. L. Comparison between plate heat exchanger and shell-and-tube heat exchanger, 2018, available at website of hfmphe.com

32 United States Environmental Protection Agency. CHP Project Development Handbook. 2008, available at the website of energy.gov

33 Maraver D, Sin A, Royo J, Assessment of CCHP systems based on biomass combustion for small-scale applications through a review of the technology and analysis of energy efficiency parameters. Applied Energy, 2013, 102: 1303–1313

34 United States Environmental Protection Agency. Methods for calculating CHP efficiency. In: Combined Heat and Power Partnership, 2020, available at the website of epa.gov

35 Ibrahim T K, Mohammed M K, Awad O I, A comprehensive review on the exergy analysis of combined cycle power plants. Renewable & Sustainable Energy Reviews, 2018, 90: 835–850

36 Kumar A, Sharma M, Thakur P, A review on exergy analysis of solar parabolic collectors. Solar Energy, 2020, 197: 411–432

37 Saidur R, BoroumandJazi G, Mekhilef S, A review on exergy analysis of biomass based fuels. Renewable & Sustainable Energy Reviews, 2012, 16(2): 1217–1222

38 Mehrpooya M, Khalili M, Sharifzadeh M M M. Model development and energy and exergy analysis of the biomass gasification process (based on the various biomass sources). Renewable & Sustainable Energy Reviews, 2018, 91: 869–887

39 Chen H, Zhang M, Wu Y, Design and performance evaluation of a new waste incineration power system integrated with a supercritical CO₂ power cycle and a coal-fired power plant. Energy Conversion and Management, 2020, 210: 112715

40 Kaushik S C, Reddy V S, Tyagi S K. Energy and exergy analyses of thermal power plants: a review. Renewable & Sustainable Energy Reviews, 2011, 15(4): 1857–1872

41 Balli O, Aras H, Hepbasli A. Exergoeconomic analysis of a combined heat and power (CHP) system. International Journal of Energy Research, 2008, 32(4): 273–289

42 Ji X, Li S, Gao L, Thermodynamic comparison and efficiency enhancement mechanism of coal to alternative fuel systems. Applied Thermal Engineering, 2016, 103: 1251–1260

43 Jin H, Zhao H, Liu Z, A novel EFHAT system and exergy analysis with energy utilization diagram. Energy, 2004, 29(12–15): 1983–1991

44 Peng S, Hong H, Jin H, An integrated solar thermal power system using intercooled gas turbine and Kalina cycle. Energy, 2012, 44(1): 732–740

45 Peng S, Wang Z, Hong H, Exergy evaluation of a typical 330 MW solar-hybrid coal-fired power plant in China. Energy Conversion and Management, 2014, 85: 848–855

46 Xu G, Xu C, Yang Y, A novel flue gas waste heat recovery system for coal-fired ultra-supercritical power plants. Applied Thermal Engineering, 2014, 67(1-2): 240–249

47 Fan J, Wei S, Zhang X, A comparison of the regional investment benefits of CCS retrofitting of coal-fired power plants and renewable power generation projects in China. International Journal of Greenhouse Gas Control, 2020, 92: 102858

48 Chen H, Wu Y, Xu S, Thermodynamic and economic evaluation of a novel heat supply design using low-pressure feedwater in a cogeneration plant. Applied Thermal Engineering, 2020, 166: 114672

49 Shang S, Li X, Chen W, A total heat recovery system between the flue gas and oxidizing air of a gas-fired boiler using a non-contact total heat exchanger. Applied Energy, 2017, 207: 613–623

50 Ogorure O J, Oko C O C, Diemuodeke E O, Energy, exergy, environmental and economic analysis of an agricultural waste-to-energy integrated multigeneration thermal power plant. Energy Conversion and Management, 2018, 171: 222–240

51 Liu M, Zhang X, Ma Y, Thermo-economic analyses on a new conceptual system of waste heat recovery integrated with an S-CO₂ cycle for coal-fired power plants. Energy Conversion and Management, 2018, 161: 243–253

52 Mi X, Liu R, Cui H, Energy and economic analysis of building integrated with PCM in different cities of China. Applied Energy, 2016, 175: 324–336