Experiment Comparison between Engineering Acid Dew Point and Thermodynamic Acid Dew Point

in order to realize the accurate prediction of acid dew point, a set of measurement system of acid dew point for the flue gas flue gas in the tail of the boiler was designed and built, And measured at the outlet of an air preheater of a power plant of 1 000 MW, The results show that: Under the same conditions, with the test temperature decreases, Nu of heat transfer tubes, fouling and corrosion of pipe wall and corrosion pieces gradually deepened. Then, the measured acid dew point is compared with the acid dew point obtained by using the existing empirical formula under the same coal type. The dew point of engineering acid is usually about 40 ℃ lower than the dew point of thermodynamic acid because of the coupling effect of fouling on the acid liquid, which can better reflect the actual operation of flue gas in engineering and has certain theoretical guidance for the design and operation of deep waste heat utilization system significance.

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Performance Analysis and Optimization of Flue Gas Waste Heat Recovery System of a 600MW Coal-Fired Power Plant

ASME 2020 Power Conference ◽

10.1115/power2020-16873 ◽

2020 ◽

Author(s):

Xun Chen ◽

Shu Xu ◽

Yi Yang ◽

Li-min Wang ◽

Dun-dun Wang

Keyword(s):

Performance Analysis ◽

Flue Gas ◽

Waste Heat ◽

Structural Characteristics ◽

Heating System ◽

Heat Transfer Process ◽

Dew Point ◽

Air Preheater ◽

Waste Heat Recovery System ◽

Saving Effect

Abstract Recovering the waste heat of the flue gas from the boilers of coal-fired units, so that part of the boiler’s flue gas waste heat can be utilized in the turbine regenerative heating system is an important way to increase efficiency and reduce emissions of coal-fired units. In this paper, a 600MW supercritical coal-fired unit is taken as an example, and the conceptual design of a flue gas waste heat cascade utilization system is carried out. Based on the first and second laws of thermodynamics, the thermodynamic perfection of the heat transfer process of the rotary regenerative air preheater, the exergy efficiency of the heat displacement process of the flue gas waste heat cascade utilization system, and the overall performance parameters of the coal-fired unit are calculated and analyzed under different parameters such as the bypass flue ratio and the inlet air temperature of the regenerative air preheater. The energy-saving effect of flue gas waste heat cascade utilization system is restricted by factors such as acid dew point temperature, ammonium bisulfate (ABS) deposition inside the air preheater, etc. Based on the performance analysis of regenerative air preheater and ABS deposition law, considering the structural characteristics and operating parameters of air preheater, this paper gives a criterion number (R-number) of ABS deposition tendency, and analyzes the actual operation performance of flue gas waste heat cascade utilization system considering the restrictions.

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Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation

Energy ◽

10.1016/j.energy.2019.115980 ◽

2019 ◽

Vol 187 ◽

pp. 115980 ◽

Cited By ~ 8

Author(s):

Vladimir D. Stevanovic ◽

Milan M. Petrovic ◽

Tadeusz Wala ◽

Sanja Milivojevic ◽

Milica Ilic ◽

...

Keyword(s):

High Pressure ◽

Power Plant ◽

Flue Gas ◽

Waste Heat ◽

Low Pressure ◽

Heat Utilization ◽

Waste Heat Utilization

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Comprehensive Energy-Saving Technology for RTO Flue Gas Waste Heat Utilization

Frontiers Research of Architecture and Engineering ◽

10.30564/frae.v4i1.2656 ◽

2021 ◽

Vol 4 (1) ◽

pp. 1

Author(s):

Shuli Liu

Keyword(s):

High Temperature ◽

Energy Saving ◽

Flue Gas ◽

Waste Heat ◽

Economic Benefits ◽

Exhaust Gas ◽

Emission Standard ◽

Heat Utilization ◽

Waste Heat Utilization ◽

Energy Saving Technology

In the automobile painting workshop, the oven will discharge harmful exhaust gas, the exhaust gas can be reused through the TNV system, the natural gas can meet the emission standard to the atmosphere after burning, and the high temperature gas discharged TNV the system can carry considerable heat. Utilization can effectively improve the economic benefits of the factory. At present, the more mature scheme is to heat the high temperature exhaust gas through the heat exchanger, which can reduce the steam consumption of the factory. Based on the analysis of the comprehensive energy saving content of waste heat utilization of RTO flue gas, this paper hopes to provide some reference and reference for readers.

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