Experimental Study on Operation Regulation of a Coupled High–Low Energy Flue Gas Waste Heat Recovery System Based on Exhaust Gas Temperature Control

Liu, Jiayou; Sun, Fengzhong

doi:10.3390/en12040706

Cited by 9 publications

(4 citation statements)

References 33 publications

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“…The FWCRS has been applied to a 1000 MW ultra-supercritical double reheat coal-fired unit [34]. The technical process of the system is displayed in Figure 2 [35]. Up to 30% of high-temperature flue gas flows through an HPE and an LPE in sequence to heat boiler feed water and condensed water respectively, and the bypass flue gas valve is used to adjust the flue gas flow.…”

Section: Description Of Fwcrsmentioning

confidence: 99%

Experimental Study on a Flue Gas Waste Heat Cascade Recovery System under Variable Working Conditions

et al. 2020

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Recovering flue gas waste heat is beneficial to improving the unit efficiency in power plants. To obtain the change rules of performance parameters of a flue gas waste heat cascade recovery system (FWCRS) under variable working conditions, an experiment bench was designed and built. The variation laws of the inlet temperature and exhaust flue gas temperature of a low temperature economizer (LTE), the inlet and outlet air temperature of an air preheater (AP), the heat exchange quantities of the AP, LTE, and front-located air heater and an additional economizer (AE), as well as the waste heat recovery efficiency, the system exergy efficiency, and the energy grade replacement coefficient were obtained as the flue gas flow, flue gas temperature, bypass flue gas ratio, air temperature, and circulating water flow in AE changed. Using an orthogonal test, the flue gas temperature, bypass flue gas ratio and air temperature were proved to be the significant factors affecting the performance parameters of FWCRS, and the bypass flue gas ratio was suggested as an adjusting parameter of FWCRS under variable working conditions.

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Section: Description Of Fwcrsmentioning

confidence: 99%

Experimental Study on a Flue Gas Waste Heat Cascade Recovery System under Variable Working Conditions

et al. 2020

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“…Furthermore, Xu W et al have explored the efficacy of employing high-temperature boiler feedwater technology for recuperating medium-low temperature flue gas waste heat. Their research focused on optimizing thermal efficiency while managing exhaust temperatures and addressing the issue of low-temperature corrosion in the tail flue [4][5].…”

Section: Introductionmentioning

confidence: 99%

Computational boundary improvement and performance optimization of the flue gas waste heat cascade utilization system of the ultra-supercritical 1000 MW generator set

Wang,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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There is no uniform performance test rule and standard calculation method for efficiency improvement of a system that utilizes waste heat from flue gas and it is mainly carried out through turbine parameters, without considering boiler system performance. Given the above problem, in this paper, the steam turbine, boiler and waste heat from the flue gas step-up utilization system are calculated by establishing a thermal model of ultra-supercritical secondary reheating 1000 MW unit. At the same time, unit design data and field performance test results are used for verification. Analysis comparing simulation outcomes with experimental data revealed that the discrepancies in the heat consumption rate per unit, the efficiency of the boiler, and the rate of coal consumption for power generation peaked at a marginal variance of 0.2%. The optimum operating parameters of the system for low-grade flue gas recovery in a cascading manner are obtained through variable operating condition calculations. The optimum value of high-pressure bypass feed-water flow rate is 52 kg/s at 970 MW operating condition. At the same time, the difference between high-pressure bypass effluent and high plus effluent temperatures should be controlled to be close to 0°C, and the optimal value of low-pressure bypass condensate flow rate is 53 kg/s. As the flow of flue gas in the bypass increases, the efficiency of heat exchange in the bypass economizer also increases, resulting in greater absorption of heat in the utilization apparatus for flue gas waste heat, leading to a more effective energy-saving outcome. However, it is necessary to regulate the temperature of both the primary and secondary air to levels that exceed the minimum requirements for the safe functioning of the coal mill.

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“…The research showed that exhaust gas energy is affected not only by the outlet flue gas temperature of the boiler side but also by the comprehensive solution of steam/water side exhaust gas. Liu et al 12 obtained the operating rules of High− Low Energy FGWHRS at an exhaust gas temperature of 85 °C. The results showed that the bypass flue gas flow rate plays a decisive role in improving the heat recovery efficiency, while the circulating water flow rate has little influence on the heat recovery efficiency.…”

Section: Introductionmentioning

confidence: 99%

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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Experimental Study on Operation Regulation of a Coupled High–Low Energy Flue Gas Waste Heat Recovery System Based on Exhaust Gas Temperature Control

Cited by 9 publications

References 33 publications

Experimental Study on a Flue Gas Waste Heat Cascade Recovery System under Variable Working Conditions

Experimental Study on a Flue Gas Waste Heat Cascade Recovery System under Variable Working Conditions

Computational boundary improvement and performance optimization of the flue gas waste heat cascade utilization system of the ultra-supercritical 1000 MW generator set

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

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