Studies on the process of recovering low-temperature waste heat from a flue gas in a pilot-scale plant

Szulc, Piotr; Tietze, T.; Wójs, K.

doi:10.1515/cpe-2016-0043

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…Table 1 presents the application of different heat exchangers for coal, oil, and natural gas heating furnaces to recover waste heat from flue gas. As shown in Table 1, coal [16,17], fuel oil [18], and gas [19][20][21] heating furnaces have added heat exchangers to recover sensible heat of flue gas, of which the outlet temperature drops to 60~203 • C (higher than the acid dew point temperature). The flue gas contains corrosive gas such as SO x and NO x [22,23].…”

Section: Introductionmentioning

confidence: 99%

On-Site Experimental Study on Low-Temperature Deep Waste Heat Recovery of Actual Flue Gas from the Reformer of Hydrogen Production

Wang

Sun

et al. 2023

Sustainability

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Improving the energy-saving efficiency of flue gas deep waste heat and reducing the emission of carbon dioxide and other pollutants have been two issues that need to be paid attention to in petrochemical heating furnaces. A hydrogen production reformer with high energy consumption and high carbon emissions in the petroleum refining process affects the thermal and productive efficiency of the hydrogen production, amounts of heat from flue gas are wasted with the exhausted corrosive gas of the reformer, and latent heat is not recovered. To recover the sensible and latent heat from the exhausted gas, a new anti-corrosion, high-efficiency, and low-pressure-drop flue gas condensing heat exchanger (FGCHE) with low consumption and pressure drop was developed. The energy-saving performance was evaluated through on-site measurements and theoretical analysis. The results show that the exhausted gas temperature was reduced from 161.3~175.9 °C to 33.9~38.9 °C after using the new FGCHE to recover waste heat. The energy-saving efficiency and the utilization ratio of flue gas waste heat were 12~16.1% and 74~81.9%, respectively. The latent heat accounted for 41.3~48.1% of the total recovered heat. The exergy efficiency and the total thermal efficiency of the reformer reached 73~86.8% and 95.2~96.6%, respectively. The condensation in the flue gas reduced pollutant emissions (SO2 and NOx). This paper provides a practical application reference for the technology development of waste heat recovery and the application of an FGCHE for petrochemical heating furnaces.

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Section: Introductionmentioning

confidence: 99%

On-Site Experimental Study on Low-Temperature Deep Waste Heat Recovery of Actual Flue Gas from the Reformer of Hydrogen Production

Wang

Sun

et al. 2023

Sustainability

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“…There are also many scholars who have carried out innovative design and optimization of the waste heat recovery system. Szulc et al 13 have established a pilot plant to recover the waste heat of flue gas through condensing the heat exchanger with water at about 40 °C. The experiment showed that the system in this paper has stronger heat recovery efficiency than the conventional waste heat recovery system without a condenser.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of the Technology of High-Temperature Boiler Feed Water to Recover the Waste Heat of Mid–Low-Temperature Flue Gas

Jin

Zhu

et al. 2021

ACS Omega

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In coal-fired power plants, most of the working fluids used in a mid−lowtemperature flue gas waste heat recovery system (FGWHRS) are low-temperature boiler supply air or condensate water in the flue gas condenser. This is prone to cause lowtemperature corrosion, as the system temperature is lower than the acid dew point of the flue gas. In this study, an experimental apparatus was set up at the entrance of the desulfurization tower of a 330 MW unit in Xinjiang, China, which uses the technology of high-temperature boiler feed water (above 80 °C) to recover the waste heat of mid−low-temperature flue gas. The heat exchange performance of the mid−low-temperature FGWHRS was evaluated under different working conditions, and the optimal input parameters of the system for each considered working condition are given based on the analysis. It was found that the lowtemperature corrosion in the system could be avoided using this technology. To eliminate lowtemperature corrosion, the lowest temperature for the inlet water was predicted to be 69 °C in our study via curve fitting based on the experimental data. The results could provide a theoretical basis and engineering guidance for determining the best heat recovery strategy of mid−low-temperature FGWHRS.

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Conversion of an existing boiler to a condensing boiler

Pronobis¹

2020

Environmentally Oriented Modernization of Power Boilers

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Studies on the process of recovering low-temperature waste heat from a flue gas in a pilot-scale plant

Cited by 5 publications

References 6 publications

On-Site Experimental Study on Low-Temperature Deep Waste Heat Recovery of Actual Flue Gas from the Reformer of Hydrogen Production

On-Site Experimental Study on Low-Temperature Deep Waste Heat Recovery of Actual Flue Gas from the Reformer of Hydrogen Production

Performance Analysis of the Technology of High-Temperature Boiler Feed Water to Recover the Waste Heat of Mid–Low-Temperature Flue Gas

Conversion of an existing boiler to a condensing boiler

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