Waste heat recovery mechanism for coal-fired flue gas in a counter-flow direct contact scrubber

Wang, Haichao; Wu, Xiaozhou; Granlund, Katja; Lahdelma, Risto; Li, Ji; Teppo, Esa; Li, Yu; Duamu, Lin; Li, Xiangli; Haavisto, Ilkka

doi:10.1016/j.energy.2021.121531

Cited by 7 publications

(7 citation statements)

References 30 publications

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“…Column (5) operates in a coupled system with humidifying scrubber (7) using circulating water. Water from column ( 5) is pumped into column (7). From column (7), water is transferred back into column (5).…”

Section: Proposed Recondensation System Simulationmentioning

confidence: 99%

“…Water from column ( 5) is pumped into column (7). From column (7), water is transferred back into column (5). Here, analogous to column (4), a system is used that adds a small amount of water to achieve stability during sensitivity analyses.…”

Section: Proposed Recondensation System Simulationmentioning

confidence: 99%

“…Here, analogous to column (4), a system is used that adds a small amount of water to achieve stability during sensitivity analyses. In addition, in the system of columns (5,7), water must be added to clean the system of impurities that accumulate over time. Column ( 7) is supplied with air (stream 1), which is then directed for combustion (stream 2).…”

Section: Proposed Recondensation System Simulationmentioning

confidence: 99%

“…Moisture condensation occurs along the entire length of recovery column (5), which ensures the very high efficiency of the unit. Heated water is directed to humidifying column (7). The combustion air (stream 1) enters the same column in a countercurrent.…”

Section: Figurementioning

confidence: 99%

“…Heat recovery from waste streams is an extremely challenging issue [4]. This topic is widely discussed in the chemical engineering industry [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing the Recovery of Latent Heat of Condensation from the Flue Gas Stream through the Combustion of Solid Biomass with a High Moisture Content

Kabiesz,

Kubica

2024

Energies

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This study focuses on a specific method of heat recovery in combustion systems especially dedicated to wet biomass. Solid biofuels such as woodchips or bark are sources of renewable energy, a substitute of fossil fuels, of dynamically growing importance due to the energy transformation towards a zero-emission economy. Various solutions are generally known, in particular those based on absorption and compressor heat pumps. The solution presented here eliminates the need for such expensive equipment while maintaining very high efficiency. It involves a system of several suitably configured scrubbers. Chemcad 8 simulation shows how the fluid flow rates affect the efficiency of the proposed solution. Optimal configuration of the system and adjustment of the process parameters (flow rates of water in scrubbers circuits) result in a thermal efficiency as high as 108.2%, close to the maximum theoretically achievable efficiency (111%). The system was compared with other existing solutions for efficiency. The performance of the system was examined under different operating conditions to determine the optimum. The effect of an increased fuel moisture content on efficiency was determined. It was shown that the key to achieving significant cost benefits for such a solution is to optimise the flow rates of the circulating fluids.

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Section: Proposed Recondensation System Simulationmentioning

confidence: 99%

Section: Proposed Recondensation System Simulationmentioning

confidence: 99%

Section: Proposed Recondensation System Simulationmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

“…Heat recovery from waste streams is an extremely challenging issue [4]. This topic is widely discussed in the chemical engineering industry [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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