Dynamics of steam accumulation

Stevanović, Vladimir D.; Maslovarić, Blaženka; Prica, Sanja

doi:10.1016/j.applthermaleng.2012.01.007

Cited by 44 publications

(21 citation statements)

References 9 publications

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“…The developed nonequilibrium model is validated for a test of steam accumulator charging [15]. The measured charging mass flow rate is shown in Figure 6.…”

Section: Nonequilibrium Model Validationmentioning

confidence: 99%

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Prediction and Control of Steam Accumulation

Stevanović

Petrović

Milivojević

et al. 2014

Heat Transfer Engineering

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Steam accumulators are applied as buffers between steam generators and consumers in cases of different steam production and consumption rates. The application of the steam accumulator saves energy, reduces pressure fluctuations, and prevents aging of tubes and pressurized vessels in steam generators. In this paper, modes of the steam accumulator operation are analyzed and the general design of the steam accumulator control system is defined. Equilibrium and nonequilibrium thermodynamic models of the steam accumulator are presented with the aim of predicting the steam accumulator capacity and as support to the design of the control system. The equilibrium model is based on the mass and energy balance equations of the total water and steam content in the accumulator, while the nonequilibrium model is based on the mass and energy balance equations for each phase and closure laws of nonequilibrium evaporation and condensation rates. The steam accumulator pressure transients are simulated for constant steam charging and discharging flow rates, and the influence of the nonequilibrium condensation and evaporation rates on the steam accumulator capacity is shown. It is concluded that the commonly used equilibrium thermodynamic approach to the steam accumulator design does not provide accurate results in cases of rapid charging and discharging transients; therefore, there is a need for the application of the nonequilibrium approach.

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“…The developed nonequilibrium model is validated for a test of steam accumulator charging [15]. The measured charging mass flow rate is shown in Figure 6.…”

Section: Nonequilibrium Model Validationmentioning

confidence: 99%

“…where the Reynolds number for bubble flow is calculated as (15) and the relative velocity between the steam bubble and the stagnant water mass (u 1 = 0) is calculated as [12] …”

Section: Nonequilibrium Modelmentioning

confidence: 99%

Prediction and Control of Steam Accumulation

Stevanović

Petrović

Milivojević

et al. 2014

Heat Transfer Engineering

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“…Stevanovic et al [19] from Serbia proposed a non-equilibrium dynamic model in 2012, where the mass and energy conservation equations for both steam and water considered the phase change process of the working medium was established so as to investigate dynamic change trends in parameters such as pressure and water level.…”

Section: Introductionmentioning

confidence: 99%

Simulation and verification of a non-equilibrium thermodynamic model for a steam catapult’s steam accumulator

Sun

Guo

Lei

et al. 2015

International Journal of Heat and Mass Transfer

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“…To overcome the drawbacks of the equilibrium SA model, the non-equilibrium model of SA operation was developed by Studovic and Stevanovic [15]. Additionly, Stevanovic et al [16,17] developed a non-equilibrium method to evaluate the SA, and compared the results with equilibrium situations.…”

Section: Introductionmentioning

confidence: 99%

Operation Optimization of Steam Accumulators as Thermal Energy Storage and Buffer Units

Hong

Wang

2016

Energies

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Abstract:Although steam is widely used in industrial production, there is often an imbalance between steam supply and demand, which ultimately results in steam waste. To solve this problem, steam accumulators (SAs) can be used as thermal energy storage and buffer units. However, it is difficult to promote the application of SAs due to high investment costs, which directly depend on the usage volume. Thus, the operation of SAs should be optimized to reduce initial investment through volume minimization. In this work, steam sources (SSs) are classified into two types: controllable steam sources (CSSs) and uncontrollable steam sources (UCSSs). A basic oxygen furnace (BOF) was selected as an example of a UCSS to study the optimal operation of an SA with a single BOF and sets of parallel-operating BOFs. In another case, a new method whereby CSSs cooperate with SAs is reported, and the mathematical model of the minimum necessary thermal energy storage capacity (NTESC) is established. A solving program for this mathematical model is also designed. The results show that for UCSSs, applying an SA in two parallel-operating SSs requires less capacity than that required between a single SS and its consumer. For CSSs, the proposed minimum NTESC method can effectively find the optimal operation and the minimum volume of an SA. The optimized volume of an SA is smaller than that used in practice, which results in a better steam storage effect.

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Dynamics of steam accumulation

Cited by 44 publications

References 9 publications

Prediction and Control of Steam Accumulation

Prediction and Control of Steam Accumulation

Simulation and verification of a non-equilibrium thermodynamic model for a steam catapult’s steam accumulator

Operation Optimization of Steam Accumulators as Thermal Energy Storage and Buffer Units

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