Optimal operating strategy of ash deposit removal system to maximize boiler efficiency using CFD and a thermal transfer efficiency model

Park, Hyundo; Lee, Jesung; Lim, Jonghun; Cho, Hyungtae; Kim, Junghwan

doi:10.1016/j.jiec.2022.03.004

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…The closer the skewness is to 0, the better the quality. If it is close to the range of 0.98-1, the mesh is not suitable for use [18]. The averaged skewness on the mesh used was equal to 0.14; therefore, the mesh was suitable for use.…”

Section: Domain and Gridmentioning

confidence: 99%

Heat-Induced Increase in LPG Pressure: Experimental and CFD Prediction Study

et al. 2023

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Computational fluid dynamics (CFD) has become a widely used tool for predicting hazardous scenarios. The present study aimed to assess CFD prediction applied to LPG containers under heating. Thus, two cylinders, each filled with propane or butane, were experimentally exposed to fire, and the pressure increment was recorded. The results were compared with those provided by a CFD method (Ansys Fluent). The limitations of the method are discussed, and a trend in the error increment and its relation to the reduced temperature increment are presented. The results obtained show that the computational method had a good agreement, with a relative error of 19% at a reduced temperature equal to 2. Furthermore, the method had a better fit with heavier alkanes, as the butane was less influenced by temperature overestimation compared with propane.

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Section: Domain and Gridmentioning

confidence: 99%

Heat-Induced Increase in LPG Pressure: Experimental and CFD Prediction Study

et al. 2023

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“…Park optimized sootblowing systems by using heat transfer efficiency models to improve efficiency. 27 However, there is little research on the influence of operating conditions for sootblowing, such as impingement angle, distance, and pneumatic supply pressure. The optimal operating parameters for deposit removal cannot be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that deposition removal mainly occurred at the first finned tube impacted by jets, while secondary jets can hardly remove strongly adhered ash deposits. Park optimized sootblowing systems by using heat transfer efficiency models to improve efficiency . However, there is little research on the influence of operating conditions for sootblowing, such as impingement angle, distance, and pneumatic supply pressure.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Sootblowing System for Effective Deposit Removal in Radiant Syngas Cooler Using Numerical Simulation

Xia,

Gong,

Guo

et al. 2024

Ind. Eng. Chem. Res.

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The radiant syngas cooler (RSC) absorbs heat and generates steam, which is an indispensable part of the entrained-flow gasification system. The fly ash particles and molten slag adhere to the membrane wall of the RSC, resulting in an increasing thermal resistance of the membrane wall and a decreasing efficiency of the gasification system. The impact force of high-pressure airflow from the sootblowers can remove ash and slag deposits. In this study, a two-dimensional model of sootblowing without an impact wall surface and a three-dimensional model of water wall tubes in the industrial-scale RSC for a 2000 t/d entrained-flow coal gasifier are established. The effects of impingement angle, distance, and pneumatic supply pressure of sootblowers are numerically investigated to improve the sootblowing efficiency. The sootblowing gas flow characteristics and deposit removal performance analysis are studied as well. The results show that the core region of the sootblowing jet is located at a distance of 42 mm from the nozzle, exhibiting a jet velocity of 340 m/s under basic operating conditions. The effective impact distance range is insufficient when the pneumatic supply pressure is below 6.8 MPa. The effective sootblowing region reaches the largest area when the sootblowing angle is 30°and the sootblowing distance is 110 mm for radiation screens. The practical installation of sootblowers would be more optimal by selecting a smaller impact angle which can enhance the efficiency in a sootblowing system. The shorter sootblowing distance is suitable for removing high strength deposits, but it is not conducive to overall removal of ash and slag. The effective sootblowing area increases from 29.3 to 355.0 cm 2 when the pneumatic supply pressure of the sootblower is raised from 6.9 to 8.1 MPa.

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“…When burning coal with high CaO concentration, the corrosion and slagging phenomena of the furnace wall tube becomes even worse [10]. It may decrease a performance of the power plant, causing reductions in thermal efficiency as well as increase in operating and maintenance costs for coal-fired boilers [11,12]. The direct method for cleaning slag is the water soot blower cleaning system method.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Study of Water Soot Blower for Pulverized-Coal Boiler Based on Discrete Phase Model

Plangsrinont,

Nakkiew,

Baisukhan

et al. 2023

SSP

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A pulverized-coal boiler is a type of boiler that is commonly seen in power plants. During an operation, a portion of the coal is converted to ash. The consequence is a cause of slagging on the furnace wall and a considerable loss in heat transfer performance. In coal-fired power plants, slagging is one of the most common causes of maintenance issues. This problem can be resolved by using a water soot blower cleaning system. It shoots a high-pressure jet of water through a hole in the side of the furnace’s wall to clean the opposite wall surfaces. This study presents a Computational Fluid Dynamics (CFD) investigation of the water soot blower trajectory with a flow field in full-scale boiler. Multiphase-flow simulation is utilized. The turbulence model couple and Discrete Phase Model are used to analyze flow field in boiler and water soot blower trajectory, respectively. The aim is to accurately determine an injection angle degree for the water soot blower. The CFD results are compared with the experiment of water soot blower shooting in Cold Air Velocity Test (CAVT) conditions. The results of the study show that the simulation results agree with the experimental data. Moreover, the velocity profile of numerical study shows that the effect of flow field in boiler has little effect on the water soot blower trajectory.

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Optimal operating strategy of ash deposit removal system to maximize boiler efficiency using CFD and a thermal transfer efficiency model

Cited by 12 publications

References 26 publications

Heat-Induced Increase in LPG Pressure: Experimental and CFD Prediction Study

Heat-Induced Increase in LPG Pressure: Experimental and CFD Prediction Study

Optimization of a Sootblowing System for Effective Deposit Removal in Radiant Syngas Cooler Using Numerical Simulation

Simulation and Experimental Study of Water Soot Blower for Pulverized-Coal Boiler Based on Discrete Phase Model

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