Perspectives for 700 °C ultra-supercritical power generation: Thermal safety of high-temperature heating surfaces

Zhang, Zhongxiao; Zhou, Ru; Ge, Xueli; Zhang, Jian; Wu, Xiaojiang

doi:10.1016/j.energy.2019.116411

Cited by 41 publications

(13 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, coal type E used less coal consumption in producing 700 megawatts. As agreed by Speight (2015) and Zhang et al (2020), the coal consumption and combustion performance in the boiler furnace is reflected from coal specification used. Combustion is commonly called burning, and the substance that burns is usually referred to as fuel.…”

Section: Data Analysis and Discussionmentioning

confidence: 84%

See 1 more Smart Citation

Developing Sub-Bituminous Coal Sintering Ratio for Predicting Coal Ash Slagging Factors

Samsudin¹,

Aziz²,

Hairuddin³

et al. 2021

IJTech

View full text Add to dashboard Cite

Fossil fuels such as coal, gas, and distillate are the core fuels for thermal plants. The thermal coal-fired power plant accounts for 40% of global electricity generation. The thermal coal plant is expected to continue generating electricity until 2040, covering roughly 60-75% of the energy demand. Coal is largely used as fuel in thermal power plants in generating electricity. Coal ash causes slagging and fouling at the boiler in the furnace, superheater tube, and pendant tube. Thus, the prediction of coal slagging and fouling is imperative for forecasting boiler repair work and outage. Therefore, this study was conducted in a thermal coal-fired power plant generating 700 megawatts. X-ray diffraction analysis (XRD) was applied to analyze the ash composition. A coal sintering method was developed as an indicator to predict ash slagging. Several coals with different characteristics were selected to conduct the coal ash analysis. Furthermore, sub-bituminous coal sintering indexes for predicting coal ash slagging factors were also developed. From this study, there are minimal ash deposition tendencies for sub-bituminous coal ash with a low sinter ratio of 0.2, whereas the ash deposition tendencies are high for high sinter ratios of 0.8 and above.

show abstract

Section: Data Analysis and Discussionmentioning

confidence: 84%

“…The 1% energy efficiency increase contributes to the quantity of steam saved, equaling 1000 tons per year with the assumption of a 5% steam consumption reduction in a year. Reduction of 5% steam is equal to cost savings of about 3000 dollars per hour (Zhang et al, 2020).…”

Section: Data Analysis and Discussionmentioning

confidence: 99%

Developing Sub-Bituminous Coal Sintering Ratio for Predicting Coal Ash Slagging Factors

Samsudin¹,

Aziz²,

Hairuddin³

et al. 2021

IJTech

View full text Add to dashboard Cite

show abstract

“…With the development of global economy, especially the rapid growth of industry in emerging economies, environmental pollution and energy crisis have attracted increasing attention [1]. In this context, ultrasupercritical fossil power plants have been widely studied and applied, and the utilization efficiency of coal has been greatly improved by improving steam parameters [2][3][4]. In modern steam power plants, 9%-12% Cr heat-resistant steels are widely applied to valves, vane carriers, inlet pipes, and other components due to their excellent high-temperature mechanical properties at 600 °C [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer

Jiao¹,

Sheng²,

Li³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

9CrMoCoB heat-resistant steel was transient liquid phase (TLP) bonded using the Ni–Cr–B amorphous filler metal. Results indicated that the TLP-bonded joint was composed of three feature regions, and the precipitation in the diffusion affected zone (DAZ) were M23(C,B)6-type carboborides and M3B2-type borides with different morphologies and locations. Fine granular Fe2Mo-type Laves phases and MX-type carbides that existed in the original base metal were found in the grain. The carboborides and borides in DAZ that grown with the increase in bonding time and temperature reduced or completely dissolve after PWHT. The joints without PWHT showed high strength and low elongation due to the high hardness and high hardenability of the matrix. The initiation of cracks occurred on borides in ASZ and carboborides in Ni-DAZ and passed through in the bonded seam, resulting in the reduction of the tensile strength of the bonded joints. The hardness of the joints was obviously reduced, and the toughness of the joints was obviously improved after PWHT. The highest tensile strength could reach 744 MPa when the TLP joints were bonded at 1150°C for 30 min, which was comparable with the original base metal.

show abstract

“…3 However, the operating conditions of high steam temperatures and pressures in a coal-fired boiler result in several technical problems, including thermal safety problems. 5 The main problems of HELE technologies are boiler performance optimization, ash deposition, and material problems. With respect to boiler combustion performance, this is significantly related to increasing the net boiler efficiency and reducing emissions, particularly CO 2 and NOx.…”

Section: Introductionmentioning

confidence: 99%

“…However, the operating conditions of high steam temperatures and pressures in a coal-fired boiler result in several technical problems, including thermal safety problems . The main problems of HELE technologies are boiler performance optimization, ash deposition, and material problems.…”

Section: Introductionmentioning

confidence: 99%

A Review of the Numerical Modeling of Pulverized Coal Combustion for High-Efficiency, Low-Emissions (HELE) Power Generation

et al. 2021

View full text Add to dashboard Cite

High-efficiency, low-emissions (HELE) coal-fired power plant technologies operate with a higher thermal efficiency of the steam cycle for coal-fired power generation, reducing CO2 emissions per unit energy generation. They represent some of the primary and intermediate solutions to the world’s energy security. Extensive numerical modeling efforts have been undertaken over the past several decades, which have increased our understanding of the technical problems in HELE boilers, including combustion and boiler performance optimization, ash deposition, and material problems at higher operating temperatures and pressures. Overall, the differences in the physical and chemical models, boiler performance, and ash deposition of oxy-fuel combustion in HELE boilers that recirculate CO2 and H2O in the boilers are also discussed in comparison with the combustion of coal in the air. This Review comprehensively summarizes the current research on numerical modeling to offer a better understanding of the technical aspects and provides future research requirements of HELE coal-fired boilers, including boiler performance optimization, ash deposition, and material problems. The effects of changes in the configuration and operating conditions are discussed, focusing on the optimization of boiler performance in aspects such as unburnt carbon and NOx emissions. The paper also reviews the retrofit and optimization of operating conditions and the burner geometry with the low-NOx coal combustion technologies necessary to operate the HELE power plants. In terms of ash deposition, the development of submodels, including particle sticking and impacting behaviors and their effects on the deposit growth predictions under different temperatures, are discussed. Numerical models of the material oxidation and creep in the austenitic and nickel-based alloys generally used in HELE conditions have been developed using the finite element method to predict the availability of advanced alloys and creep life in the actual service time of the boiler parts. The predictions of oxide scale growth and exfoliation on the steam-side and fire-side and the creep strength are analyzed. The review also identifies some further research requirements in numerical modeling to achieve the optimization of coal combustion processes and address the technical problems in advanced HELE power plant operations.

show abstract

Perspectives for 700 °C ultra-supercritical power generation: Thermal safety of high-temperature heating surfaces

Cited by 41 publications

References 33 publications

Developing Sub-Bituminous Coal Sintering Ratio for Predicting Coal Ash Slagging Factors

Developing Sub-Bituminous Coal Sintering Ratio for Predicting Coal Ash Slagging Factors

Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer

A Review of the Numerical Modeling of Pulverized Coal Combustion for High-Efficiency, Low-Emissions (HELE) Power Generation

Contact Info

Product

Resources

About

Perspectives for 700 °C ultra-supercritical power generation: Thermal safety of high-temperature heating surfaces

Cited by 41 publications

References 33 publications

Developing Sub-Bituminous Coal Sintering Ratio for Predicting Coal Ash Slagging Factors

Developing Sub-Bituminous Coal Sintering Ratio for Predicting Coal Ash Slagging Factors

Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer

A Review of the Numerical Modeling of Pulverized Coal Combustion for High-Efficiency, Low-Emissions (HELE) Power Generation

Contact Info

Product

Resources

About

Perspectives for 700 °C ultra-supercritical power generation: Thermal safety of high-temperature heating surfaces