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Zhao Y, Zhang C, Ma L, Yu S, Li J, Tan P, Fang Q, Luo G, Yao H, Chen G. Comprehensive effect of increased calcium content in coal on the selenium emission from coal-fired power plants: Combined laboratory and field experiments. JOURNAL OF HAZARDOUS MATERIALS 2024; 470:134141. [PMID: 38583201 DOI: 10.1016/j.jhazmat.2024.134141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/12/2024] [Accepted: 03/25/2024] [Indexed: 04/09/2024]
Abstract
Coal combustion is the major contributor to global toxic selenium (Se) emissions. Inorganic elements in coals significantly affect Se partitioning during combustion. This work confirmed that the calcium (Ca) in ash had a stronger relationship with Se retention at 1300 °C than other major elements. Ca oxide chemically reacted with gaseous Se, and its sintering densification slightly affected Se adsorption capacities (44.45 -1840.71→35.17 -1540.15 mg/kg) at 300 - 1300 °C. Therefore, Ca in coals was identified as having potential for hindering gaseous Se emissions, and coals with increased Ca contents (2.74→5.19 wt%) were used in a 350 MW unit. The decreased Se mass distribution (3.54%→2.63%) in flue gas at air preheater inlet (320 -362 °C) confirmed the effectiveness of increased Ca content on gaseous Se emission reduction. More gaseous Se further condensed and was chemically adsorbed by fly ash when passed through an electrostatic precipitator, resulting in a significant increase in the Se content of fly ash. Additionally, the corresponding Se leaching ratio decreased from 4.88 - 35.74% to 1.87 - 26.31%, indicating enhanced stability of Se enriched in fly ash. This research confirmed the feasibility and environmental safety of sequestration of gaseous Se from flue gas to fly ash by increasing the Ca content in coals.
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Affiliation(s)
- Yan Zhao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Cheng Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China.
| | - Lun Ma
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China.
| | - Shenghui Yu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Junchen Li
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Peng Tan
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Qingyan Fang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Guangqian Luo
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Hong Yao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Gang Chen
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
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Ross-Veitía BD, Palma-Ramírez D, Arias-Gilart R, Conde-García RE, Espinel-Hernández A, Nuñez-Alvarez JR, Hernández-Herrera H, Llosas-Albuerne YE. Machine learning regression algorithms to predict emissions from steam boilers. Heliyon 2024; 10:e26892. [PMID: 38434324 PMCID: PMC10904275 DOI: 10.1016/j.heliyon.2024.e26892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 01/30/2024] [Accepted: 02/21/2024] [Indexed: 03/05/2024] Open
Abstract
Currently, the modeling of complex chemical-physical processes is drastically influencing industrial development. Therefore, the analysis and study of the combustion process of the boilers using machine learning (ML) techniques are vital to increase the efficiency with which this equipment operates and reduce the pollution load they contribute to the environment. This work aims to predict the emissions of CO, CO2, NOx, and the temperature of the exhaust gases of industrial boilers from real data. Different ML algorithms for regression analysis are discussed. The following are input variables: ambient temperature, working pressure, steam production, and the type of fuel used in around 20 industrial boilers. Each boiler's emission data was collected using a TESTO 350 Combustion Gas Analyzer. The modeling, with a machine learning approach using the Gradient Boosting Regression algorithm, showed better performance in the predictions made on the test data, outperforming all other models studied. It was achieved with predicted values showing a mean absolute error of 0.51 and a coefficient of determination of 99.80%. Different regression models (DNN, MLR, RFR, GBR) were compared to select the most optimal. Compared to models based on Linear Regression, the DNN model has better prediction performance. The proposed model provides a new method to predict CO2, CO, NOx emissions, and exhaust gas outlet temperature.
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Affiliation(s)
- Bárbara D. Ross-Veitía
- National Center for Applied Electromagnetism (CNEA), Universidad de Oriente, Ave. de Las Américas s/n, 90100, Santiago de Cuba, Cuba
| | - Dayana Palma-Ramírez
- National Center for Applied Electromagnetism (CNEA), Universidad de Oriente, Ave. de Las Américas s/n, 90100, Santiago de Cuba, Cuba
| | - Ramón Arias-Gilart
- National Center for Applied Electromagnetism (CNEA), Universidad de Oriente, Ave. de Las Américas s/n, 90100, Santiago de Cuba, Cuba
| | - Rebeca E. Conde-García
- National Center for Applied Electromagnetism (CNEA), Universidad de Oriente, Ave. de Las Américas s/n, 90100, Santiago de Cuba, Cuba
| | - Alejandro Espinel-Hernández
- National Center for Applied Electromagnetism (CNEA), Universidad de Oriente, Ave. de Las Américas s/n, 90100, Santiago de Cuba, Cuba
| | - José R. Nuñez-Alvarez
- Energy Department, Universidad de la Costa, (CUC), Calle 58 # 55-66, Barranquilla, 080002, Colombia
| | - Hernan Hernández-Herrera
- Faculty of Engineering, Universidad Simón Bolívar, Carrera 59 #59-132, Barranquilla, 080002, Colombia
| | - Yolanda E. Llosas-Albuerne
- Electrical Engineering Department, Universidad Técnica de Manabí (UTM), Portoviejo, Manabí, 130105, Ecuador
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Cheng M, Bai G, Zhao H, Li J, Su J, Wang J, Zhang X. Prediction Model of Lean Coal Adsorption of Power Plant Flue Gas. ACS OMEGA 2024; 9:12101-12115. [PMID: 38497005 PMCID: PMC10938422 DOI: 10.1021/acsomega.3c10005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 02/05/2024] [Accepted: 02/12/2024] [Indexed: 03/19/2024]
Abstract
To minimize errors in calculating coal flue gas adsorption capacity due to gas compressibility and to preclude prediction inaccuracies in abandoned mine flue gas storage capacity for power plants, it is imperative to account for the influence of compression factor calculation accuracy while selecting the optimal theoretical adsorption model. In this paper, the flue gas adsorption experiment of a power plant with coal samples gradually pressurized to close to 5 MPa at two different temperatures is carried out, and the temperature and pressure data obtained from the experiment are substituted into five different compression factor calculation methods to calculate different absolute adsorption amounts. The calculated adsorption capacities were fitted into six theoretical adsorption models to establish a predictive model suitable for estimating the coal adsorption capacity in power plant flue gas. Results reveal significant disparities in the absolute adsorption capacity determined by different compression factors, with an error range of 0.001278-7.8262 (cm3/kg). The Redlich-Kwong equation of state emerged as the most suitable for the flue gas of the selected experimental coal sample and the chosen composition ratio among the five compression factors. Among the six theoretical adsorption models, the Brunauer-Emmett-Teller model with three parameters demonstrated the highest suitability for predicting the adsorption capacity of coal samples in power plant smoke, achieving a fitting accuracy as high as 0.9922 at 49.7 °C.
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Affiliation(s)
- Miaoxin Cheng
- College
of Safety Science & Engineering, Liaoning
Technical University, Huludao, Liaoning 125105, China
| | - Gang Bai
- College
of Safety Science & Engineering, Liaoning
Technical University, Huludao, Liaoning 125105, China
- Key
Laboratory of Mine Thermodynamic Disasters & Control of Ministry
of Education, Huludao, Liaoning 125105, China
| | - Hongbao Zhao
- School
of Energy and Mining Engineering, China
University of Mining and Technology (Beijing), Beijing 100083, China
| | - Jinyu Li
- College
of Safety Science & Engineering, Liaoning
Technical University, Huludao, Liaoning 125105, China
- Key
Laboratory of Mine Thermodynamic Disasters & Control of Ministry
of Education, Huludao, Liaoning 125105, China
| | - Jun Su
- College
of Safety Science & Engineering, Liaoning
Technical University, Huludao, Liaoning 125105, China
| | - Jue Wang
- College
of Safety Science & Engineering, Liaoning
Technical University, Huludao, Liaoning 125105, China
| | - Xun Zhang
- College
of Mining, Liaoning Technical University, Fuxin 123000, China
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Hu D, Ma X, Bai J, Fan Y, Yu Y, Ma R, Zhang J, Du A, Xi T, Zhao X, Wang S. Investigating the Corrosive Influence of Chloride Ions on Slag Recovery Machine Inner Guide Wheel in Power Plants. MATERIALS (BASEL, SWITZERLAND) 2024; 17:457. [PMID: 38255625 PMCID: PMC10817283 DOI: 10.3390/ma17020457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 01/09/2024] [Accepted: 01/16/2024] [Indexed: 01/24/2024]
Abstract
An important method that coal-fired power plants use to realise low-cost zero discharge of desulfurisation wastewater (FGD wastewater) is to utilise wet slag removal systems. However, the high Cl- content of FGD wastewater in wet slag removal systems causes environmental damage. In this study, the corrosion behaviour of the inner guide wheel material, 20CrMnTi, was studied using dynamic weight loss and electrochemical methods. X-ray diffraction, scanning electron microscopy, and energy spectroscopy were used to analyse the organisational and phase changes on the surfaces and cross sections of the samples at different Cl- concentrations. The corrosion rate increased with the Cl- concentration up to 20 g/L, but it decreased slightly when the Cl- concentration exceeded 20 g/L. In all the cases, the corrosion rate exceeded 0.8 mm/a. The corrosion product film density initially increased and then decreased as the Cl- concentration increased. The corrosion products comprised mainly α-FeOOH, γ-FeOOH, β-FeOOH, Fe3O4, and γ-Fe2O3.
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Affiliation(s)
- Dalong Hu
- Xi’an TPRI Water-Management & Environmental Protection Co., Ltd., State Key Laboratory of High Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Xi’an 710054, China; (D.H.); (Y.Y.); (J.Z.); (T.X.)
| | - Xiaohan Ma
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (X.M.); (J.B.); (R.M.); (A.D.); (X.Z.); (S.W.)
| | - Jintao Bai
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (X.M.); (J.B.); (R.M.); (A.D.); (X.Z.); (S.W.)
| | - Yongzhe Fan
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (X.M.); (J.B.); (R.M.); (A.D.); (X.Z.); (S.W.)
- Key Lab for New Type of Functional Materials in Hebei Province, Tianjin 300130, China
| | - Yaohong Yu
- Xi’an TPRI Water-Management & Environmental Protection Co., Ltd., State Key Laboratory of High Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Xi’an 710054, China; (D.H.); (Y.Y.); (J.Z.); (T.X.)
| | - Ruina Ma
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (X.M.); (J.B.); (R.M.); (A.D.); (X.Z.); (S.W.)
- Key Lab for New Type of Functional Materials in Hebei Province, Tianjin 300130, China
| | - Jiangtao Zhang
- Xi’an TPRI Water-Management & Environmental Protection Co., Ltd., State Key Laboratory of High Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Xi’an 710054, China; (D.H.); (Y.Y.); (J.Z.); (T.X.)
| | - An Du
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (X.M.); (J.B.); (R.M.); (A.D.); (X.Z.); (S.W.)
- Key Lab for New Type of Functional Materials in Hebei Province, Tianjin 300130, China
| | - Tianhao Xi
- Xi’an TPRI Water-Management & Environmental Protection Co., Ltd., State Key Laboratory of High Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Xi’an 710054, China; (D.H.); (Y.Y.); (J.Z.); (T.X.)
| | - Xue Zhao
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (X.M.); (J.B.); (R.M.); (A.D.); (X.Z.); (S.W.)
- Key Lab for New Type of Functional Materials in Hebei Province, Tianjin 300130, China
| | - Shengxing Wang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China; (X.M.); (J.B.); (R.M.); (A.D.); (X.Z.); (S.W.)
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