Efficiency analysis of air-fuel and oxy-fuel combustion in a reheating furnace

Han, Sang Heon; Lee, Yeon Seung; Cho, Jin-Rae; Lee, Kyun Ho

doi:10.1016/j.ijheatmasstransfer.2017.12.110

Cited by 45 publications

(22 citation statements)

References 13 publications

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“…The results of the search in various publications showed that investigations of the efficiency of fuel furnaces are still very rarely found. Studies comparing thermal efficiency between AFC and OFC in axialfueled heating furnaces have been studied [17]. Measurement of furnace efficiency tested with five different cases can increase efficiency by 50%.…”

Section: Combustion Efficiencymentioning

confidence: 99%

Analysis Combustion Efficiency in a Fluidized-Bed Combustor With a Modified Perforated Plate for Air Distribution

Erdiwansyah

Mahidin

Husin

et al. 2021

Preprint

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Combustion efficiency is one of the most important parameters, especially in the FBC combustion chamber. Investigations into the efficiency of combustion in FBC fuels using solid biomass waste fuels in recent years are increasingly in demand by researchers around the world. Specifically, this study aims to calculate the combustion efficiency in the FBC combustion chamber. Combustion efficiency is calculated based on combustion results from modification of hollow plates in the FBC combustion chamber. The modified hollow plate aims to control combustion so that the fuel incorporated can burn out and not saturate. The combustion experiments were tested using palm oil biomass solid waste fuels such as PKS, OPM, and EFB. The results of the measurements showed that the maximum combustion temperature for MCC fuel reached 863oC for M1 and 887oC on M2. The maximum combustion temperature measurements for M1 and M2 from OPM fuel testing reached 898oC and 858oC, respectively, while the maximum combustion temperature for EFB fuel was 667oC andM2 847oC, respectively. The rate of combustion efficiency with the modification of the hole plate in the FBC combustion chamber reached 96.2%. Thermal efficiency in FBC combustion chamber for OPM 72.62%, MCC 70.03%, and EFB 52.43%. The highest heat transfer rates for OPM fuel reached 7792.36 w/m, MCC 7167.38 w/m, and EFB 5127.83 w/m. Thus, modification of the holed plate in the FBC chamber showed better performance of the plate without modification.

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Section: Combustion Efficiencymentioning

confidence: 99%

Analysis Combustion Efficiency in a Fluidized-Bed Combustor With a Modified Perforated Plate for Air Distribution

Erdiwansyah

Mahidin

Husin

et al. 2021

Preprint

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“…Prieler et al [37] numerically analyse the reheating process under air-fired and oxygen enriched conditions by coupling steady state gas combustion in the furnace and the transient heat conduction within the steel billets. Han et al [38] analyse the efficiency of air-fuel and oxy-fuel combustion in a reheating furnace, considering only thermal radiation for the slab heating. However, none of these studies consider full transient simulations of the whole furnace and interaction with responses of the temperature control system.…”

Section: Basic Chemicalsmentioning

confidence: 99%

Modelling and simulation of steel reheating processes under oxy-fuel combustion conditions – Technical and environmental perspectives

Tan

Niska

et al. 2019

Energy

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This paper investigates the impact of flameless oxy-fuel combustion on the thermal performance of a pilot-scale steel reheating furnace. A comprehensive mathematical model, based on the zone method of radiation analysis, was developed, which takes into account the non-grey behaviour of the furnace atmosphere under oxy-fuel combustion conditions. The model was subsequently used to simulate the temperature profile of an instrumented slab used in the experiment. The results showed that the predicted slab temperature profile along the furnace is in good agreement with measurement. However the model over predicted the absolute slab temperatures due to the influence of formation of oxide scales on the slab surface, which was not taken into account in the current model. When compared to air-fuel combustion simulation, the results of oxy-fuel combustion also indicated a marked improvement in the furnace specific fuel consumption (approximately 16%). This was mainly due to the enhanced radiative properties of the furnace atmosphere and reduced exhaust energy losses as the result of less dilution effect from nitrogen. This resulted in reduction in the overall heating time by approximately 14 minutes. Furthermore, if the economics of carbon capture is taken into consideration, theoretically, the energy consumption per kilogram of CO 2 captured can be reduced from 3.5-4.2 MJ kg-1 to 0.96 MJ kg-1. In conclusion, the current studies support the view that oxy-fuel combustion retrofitting to reheating furnaces is a promising option, both from a technical and from an environmental point of view.

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“…Han et al [65] studied the effects of oxy-fuel combustion applications i.e. substituting air with oxygen, on the efficiency enhancement of a reheating furnace following a numerical approach.…”

Section: Han Et Al [65]mentioning

confidence: 99%

Improving By-product Gas Utilisation in Steel Milling Operations

Mampuru

2019

SSRN Journal

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Iron and steel manufacturing are energy-intensive processes. Rising energy and operational costs have placed South African steel manufacturers under financial strain, while they struggle to remain afloat within an extremely competitive global market. Declining production and export figures, as well as increasing imports, have adversely affected the sustainability and profitability of the local market. It is, therefore, imperative for local manufacturers to implement operational change strategies without additional capital investment requirements in order to save energy and reduce costs.Hot-rolling processes of steel milling operations use reheating furnaces to elevate the temperature of the steel to a state of plastic deformation prior to rolling. The reheating furnaces combust fuel gases such as by-product gases or natural gas for thermal energy. They consume 70 % of the energy of the hot-rolling processes. By-product gases are combustible carriers of energy. Coke oven gas (COG) carries 18 % of the energy input of the coke production process. The energy content of COG was found to be competitive with natural gas and compatible for high-energy requirement applications, such as in reheating furnaces.The challenge arises in that the calorific value (CV) of COG fluctuates over time. These fluctuations prove problematic during the control of COG combustion processes as the air-fuel ratio needs to be adjusted accordingly. Furnace operators typically rely on a trial-and-error method for air-fuel ratio adjustments in response to the fluctuating calorific value of coke oven gas (CV of COG). This causes furnace temperature instabilities, energy inefficiencies and production losses. Additionally, COG has a high impurity content inherent from the coal. These impurities clog CV of COG analysing equipment.Several alternative tools are available to estimate the unavailable CV of COG; however, these tools do not account for the fluctuating nature of COG and only provide static estimated values.Based on these challenges, a need was identified to facilitate more stable operations of the furnace. The aim of this study entails the development of a new methodology to adjust the Improving by-product gas utilisation in steel milling operations ii air-fuel ratio according to the incoming CV of COG and the current furnace operating conditions. The historic behaviour of the furnace is used in the control strategy.To address the recurring events where CV of COG data is unavailable, a novel methodology is developed for a time-continuous estimation of CV of COG for stable process applications.A seven-step methodology was developed whereby an appropriate method can be selected for the determination of CV of COG, based on the available data and measuring equipment.Three methods are presented, with varying accuracy and consistency.Pilot studies were undertaken on a billet mill reheating furnace in order to validate the air-fuel ratio adjustment methodology. The results verified that the air-fuel adjustments were within 94 % -98 % accurate, res...

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Efficiency analysis of air-fuel and oxy-fuel combustion in a reheating furnace

Cited by 45 publications

References 13 publications

Analysis Combustion Efficiency in a Fluidized-Bed Combustor With a Modified Perforated Plate for Air Distribution

Analysis Combustion Efficiency in a Fluidized-Bed Combustor With a Modified Perforated Plate for Air Distribution

Modelling and simulation of steel reheating processes under oxy-fuel combustion conditions – Technical and environmental perspectives

Improving By-product Gas Utilisation in Steel Milling Operations

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