Thermodynamic analysis of a petroleum volatile organic compounds (VOCs) condensation recovery system combined with mixed-refrigerant refrigeration

Wang, Haocheng; Guo, Heng; Zhao, Yanxing; Gong, Maoqiong

doi:10.1016/j.ijrefrig.2020.03.011

Cited by 35 publications

(6 citation statements)

References 23 publications

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“…To control the emission of VOCs, a VOCs removal system uses chemical techniques, which can be mainly categorized into recovery and destruction approaches 5 – 7 . The recovery approach changes the temperature and pressure to separate VOCs using techniques such as absorption 8 , adsorption 9 , 10 , membrane separation 11 , and condensation 12 . The destruction approach decomposes VOCs into carbon dioxide, water, and non-toxic or less toxic compounds using techniques such as thermal 13 , biological 14 , 15 , and catalytic oxidation 16 – 19 .…”

Section: Introductionmentioning

confidence: 99%

Data-driven autonomous operation of VOCs removal system

Kang,

Han,

Kim

et al. 2024

Sci Rep

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Removal of volatile organic compounds (VOCs) from the air has been an important issue in many industrial fields. Traditionally, the operation of VOCs removal systems has relied on fixed operating conditions determined by domain experts based on their expertise and intuition. In practice, this manual operation cannot respond immediately to changes in the system environment. To facilitate the autonomous operation of the system, the operating conditions should be optimized properly in real time to adapt to the changes in the system environment. Recently, optimization frameworks have been widely applied to real-world industrial systems across various domains using different approaches. The primary motivation for this study is the effective implementation of an optimization framework targeting a VOCs removal system. In this paper, we present a data-driven autonomous operation method for optimizing the operating conditions of a VOCs removal system to enhance the overall performance. An optimization problem is formulated with the decision variables denoting the parameters associated with the operating condition, the environmental variables representing the measurements for the system environment, the constraints specifying the control ranges of the parameters, and the objective function representing the system performance as determined by the operating conditions and environment. Using the previous operation data from the system, a neural network is trained to model the system performance as a function of the decision and environmental variables to approximate the objective function. For the current state of the system environment, the optimal operating condition is derived by solving the optimization problem. A case study of a targeted VOCs removal system demonstrates that the proposed method effectively optimizes the operating conditions for improved system performance without intervention from domain experts.

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Section: Introductionmentioning

confidence: 99%

Data-driven autonomous operation of VOCs removal system

Kang,

Han,

Kim

et al. 2024

Sci Rep

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“…Due to the excellent heat transfer properties condensation droplets demonstrate on superhydrophobic surfaces, they are used in a wide range of thermal management applications, such as water harvesting, latent heat transfer, refrigeration, electronic thermal management, and power generation [1][2][3][4][5][6][7]. To further enhance the heat transfer performance of these surfaces, it is crucial to study the mechanisms of both heat transfer and droplet growth on subcooling surfaces.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer and Development in Spherical Condensation Droplets

Dong,

Lu,

Liu

et al. 2024

Micromachines

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This study establishes thermodynamic assumptions regarding the growth of condensation droplets and a mathematical formulation of droplet energy functionals. A model of the gas–liquid interface condensation rate based on kinetic theory is derived to clarify the relationship between condensation conditions and intermediate variables. The energy functional of a droplet, derived using the principle of least action, partially elucidates the inherent self-organizing growth laws of condensed droplets, enabling predictive modeling of the droplet’s growth. Considering the effects of the condensation environment and droplet heat transfer mechanisms on droplet growth dynamics, we divide the process into three distinct stages, marked by critical thresholds of 105 nm3 and 1010 nm3. Our model effectively explains why the observed contact angle fails to reach the expected Wenzel contact angle. This research presents a detailed analysis of the factors affecting surface condensation and heat transfer. The predictions of our model have an error rate of less than 3% error compared to baseline experiments. Consequently, these insights can significantly contribute to and improve the design of condensation heat transfer surfaces for the phase-change heat sinks in microprocessor chips.

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“…4 In addition to the negative aspects, these compounds also have high added value, making their recovery a twofold advantage: reducing a harmful emission with a subsequent potential economic benefit. 5 In terms of available technology, adsorption is one of the most efficient and cheapest methods for controlling these emissions, 6 above other techniques, such as absorption, cryogenic separation, and membranes. 7 Among the VOCs, cyclohexane (C 6 H 12 ) has aroused great interest since it is present in some industrial processes, like paint and varnish, it is used for obtaining precursors to nylon, and it also has important effects on the human nervous system in case of long exposures.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Long-term exposures have been demonstrated to be a potential risk for the development of certain diseases, and these emissions are also precursors of ozone (O 3 ) formation in the atmosphere, which is their main environmental issue . In addition to the negative aspects, these compounds also have high added value, making their recovery a twofold advantage: reducing a harmful emission with a subsequent potential economic benefit . In terms of available technology, adsorption is one of the most efficient and cheapest methods for controlling these emissions, above other techniques, such as absorption, cryogenic separation, and membranes .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of HKUST-1 as Volatile Organic Compound Adsorbents for Respiratory Filters

et al. 2022

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Cyclohexane is a representative of volatile organic compounds (VOCs). VOCs can cause serious health problems in case of continuous exposure; therefore, it is essential to develop efficient personal protective equipment. Historically, activated carbons are used as VOC adsorbents. However, the emergence of promising novel adsorbents, such as metal–organic frameworks, has pushed the research to study their behavior under the same conditions. In this work, the use of the well-known HKUST-1 MOF of different particle sizes (20 μm, 300–600 μm, and 1–1.18 mm) for the adsorption of low-grade (5000 ppm) cyclohexane combined with different water concentrations (dry, 27 and 80% RH) in a fixed bed is proposed. The results were compared under the same conditions for a typically used activated carbon, PICACTIF TA 60. HKUST-1 has higher affinity to cyclohexane than PICACTIF for the whole pressure range studied, especially at low partial pressures. It begins to adsorb much earlier (0.0025 kPa) than the activated carbon (0.01 kPa). However, a different adsorption behavior is evidenced for both materials in the presence of water vapor since HKUST-1 is very hydrophilic in the zone near to the copper open metal sites, whereas PICACTIF is hydrophobic. After three consecutive cycles, good stability results were obtained for the MOF, comparable to activated carbon, even in the presence of water. As the main finding, although the unstability of HKUST-1 is well established under high humid conditions, the kinetic of degradation has not been established so far. Here, it is shown that the time usage of HKUST-1 as the adsorbent for respiratory mask (single pass) is not affected by the degradation of the structure, which may occur on a longer time scale. Finally, shaping by tableting provides good results since it is possible to increase the MOF density by around 69% with minor loss of adsorption capacity. The best fraction is 300–600 μm, reaching cyclohexane breakthrough times around 85 min/cm3 at 80% RH, comparable with PICACTIF-activated carbon and promising for practical applications.

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Thermodynamic analysis of a petroleum volatile organic compounds (VOCs) condensation recovery system combined with mixed-refrigerant refrigeration

Cited by 35 publications

References 23 publications

Data-driven autonomous operation of VOCs removal system

Data-driven autonomous operation of VOCs removal system

Numerical Investigation of Heat Transfer and Development in Spherical Condensation Droplets

Evaluation of HKUST-1 as Volatile Organic Compound Adsorbents for Respiratory Filters

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