How does residence time affect hydrate formation?
Best insight from top research papers
Residence time has a significant effect on hydrate formation. In a study by 杨明军 et al. , it was found that the formal induction time for hydrate formation in a porous medium was shorter in pure water compared to water with pores. Decreasing the pore size and increasing salinity and temperature led to an increase in equilibrium pressure. Higher salinity also resulted in higher equilibrium pressure. The effects of pore size and salinity on hydrate equilibrium were found to be different. Additionally, at lower methane concentrations, hydrate equilibrium was achieved at lower pressures and higher temperatures. Another study by Marty D. Frisbee et al. showed that traditional surface water age-dating methods may underestimate mean residence times in watersheds, leading to unrealistically high weathering rates. These findings highlight the importance of considering residence time in understanding hydrate formation and its implications for process behavior.
Answers from top 5 papers
More filters
| Papers (5) | Insight |
|---|---|
| The provided paper does not discuss the effect of residence time on hydrate formation. | |
| The provided paper does not discuss the specific topic of how residence time affects hydrate formation. The paper focuses on residence time distributions in watersheds and their implications for age-dating methods and process behavior. | |
2 Citations | The provided paper does not discuss the effect of residence time on hydrate formation. |
Open access 28 Apr 2010 6 Citations | The provided paper does not mention anything about the effect of residence time on hydrate formation. |
| The provided paper does not mention anything about hydrate formation or how residence time affects it. |
Related Questions
How does residence time affect the torrefaction of briquetted biofuels?5 answersThe effect of residence time on the torrefaction of briquetted biofuels is a critical parameter that influences the quality and characteristics of the final product. Research indicates that residence time, alongside temperature, significantly impacts the torrefaction process, affecting mass yield, energy yield, and the physical and chemical properties of the torrefied biomass.
A study on rubber wood pellet torrefaction found that the torrefaction severity index (TSI), which correlates with the properties of torrefied biomass, is more sensitive to torrefaction temperature than to residence time. However, experiments using forest residuals as feedstock identified optimal operating conditions at a short residence time of 10 minutes, suggesting that shorter residence times, under certain conditions, can lead to higher quality briquettes. This is supported by findings from the torrefaction of three lignocellulose biomasses, where a residence time of 40 minutes was recommended for effective torrefaction at 300°C.
Conversely, the oxidative torrefaction of sunflower husks employed a fluidized bed reactor with vertical baffles to ensure sufficient residence time, indicating the importance of controlling residence time for uniform treatment of biomass. Similarly, the torrefaction of commercially available wood pellets showed that an increase in temperature reduced the yield of torrefied pellets, indirectly suggesting the interplay between temperature and residence time in determining product yield and quality.
Studies on torrefied corn stover highlighted that gas residence time did not significantly affect energy yield or other parameters, suggesting that the impact of residence time may vary with the type of biomass and the specific conditions of the torrefaction process. Furthermore, research on various biomass types, including wood species and biomass residues, emphasized that the energy density of the solid product increases with increasing temperature and residence time, though solid product yields decrease.
In summary, while the optimal residence time for torrefaction can vary depending on biomass type and torrefaction conditions, it is evident that residence time, in conjunction with temperature, plays a crucial role in determining the efficiency of the torrefaction process and the quality of the torrefied briquetted biofuels.
How does wax impacts the water convertion into gas hydrates?4 answersWax has a significant impact on the conversion of water into gas hydrates. The presence of wax crystals in water-in-oil emulsions delays the nucleation of hydrates by limiting the diffusion of gas in the liquid phase. Wax content greater than or equal to 2 wt% impairs the gelling structure of wax-containing oil, leading to a sudden decrease in slurry viscosity during the swift hydrate growth stage. The aggregation of wax and hydrate affects the solubility fluctuation of natural gas in oil, resulting in a decrease in gas consumption during hydrate formation. Wax crystals also increase the contact area between gas and liquid, accelerating hydrate nucleation and formation. However, the presence of wax in hydrate-containing systems reduces the hydrate growth rate and cumulative gas consumption, deteriorating transportability and increasing plugging risks.
How does pressure and temperature condition affect hydrate formation?5 answersPressure and temperature conditions have a significant impact on hydrate formation. Higher pressure and lower temperature promote hydrate formation, but they can increase production costs. The induction time and temperature increase during hydrate formation are influenced by changes in temperature and pressure. Heating and secondary pressurization also enhance hydrate formation and increase hydrate saturation. The concentration of surfactants, such as SDS, can affect the saturation of gas hydrates, with an optimal concentration promoting hydrate formation. Thermal conductivity in gas-saturated sediments can either increase or decrease depending on the conditions of hydrate formation, with an increase observed at positive temperatures and a decrease during hydrate formation in frozen samples. By analyzing the results, it was found that increasing the concentration of propane and normal butane decreases the equilibrium pressure for hydrate formation.
Comparison of kinetics of hydrate formation and dissociation?5 answersThe kinetics of hydrate formation and dissociation have been studied in various contexts. In the context of CO2 sequestration, amino acid solutions in brine were found to inhibit CO2 hydrate formation and stabilize hydrate dissociation, with l-methionine showing the best performance. In the context of carbon capture and storage, the formation and dissociation kinetics of liquid CO2 hydrates in brine were examined, with freshwater systems showing higher hydrate conversion but slower dissociation compared to brine systems. In the context of methane hydrate formation and dissociation, mass transfer coefficients for dissociation were found to be higher than for formation, and the results can be applied to predict methane production from naturally occurring methane hydrate deposits. In the context of preventing gas outbursts in coal mining, the formation and dissociation kinetics of hydrate in the presence of coal and tetrahydrofuran were studied, highlighting the effectiveness of gas hydrate formation in preventing gas outbursts. In the context of pipeline transportation, the formation and dissociation of hydrate in emulsion dispersed by surfactant and solid were studied, with the presence of Cellulose Nanocrystals prolonging the induction time of hydrate formation and increasing the final residual pressure.
What are the kinetics of methane hydrate formation and dissociation?5 answersThe kinetics of methane hydrate formation and dissociation have been studied in several papers. The formation process appears to occur in three stages, with the energy of the system increasing until it exceeds the activation energy, initiating dissociation. Consistent dissociation then occurs, followed by the dissociation of the remaining hydrates across a nonplanar and heterogeneous interface. The effect of surfactant concentration on hydrate formation kinetics has also been investigated, with lower concentrations enhancing formation during initial stages and higher concentrations delaying gas release during dissociation. Pore-scale numerical simulations have analyzed the effect of heat and mass transfer on dissociation rates, with the mass transport limitation showing that dissociation occurs near the gas phase. The presence of micron-sized sands in gas-water-sand systems has been found to slightly prolong the hydrate induction time and have little effect on the kinetics of formation. Finally, the thermodynamic characteristics of CH4 hydrate formation have been shown to depend greatly on the promoter used.
What is the difference between hydrate nucleation time and induction time?5 answersThe difference between hydrate nucleation time and induction time is that nucleation time refers to the time needed for a visible hydrate to form, while induction time is the time required for the production of a quantifiable quantity of hydrates. Nucleation time is often misinterpreted as induction time in the literature. Induction time is typically measured by putting the experimental system under specific pressure and temperature conditions and waiting for the hydrate to form, while nucleation time is the time needed to reach a visible hydrate. Induction time can be evaluated by measuring the heat produced during the formation process, which allows for the calculation of the moles of hydrates formed. Nucleation time is a nanoscale process and can occur through various routes, such as heterogeneous formation on the interface between gas (or liquid) and water or homogeneously from dissolved hydrate formers in water.