Simulation of rapid increase in the steam mass flow rate at a supercritical power boiler outlet

Zima, Wiesław

doi:10.1016/j.energy.2019.02.127

Cited by 27 publications

(6 citation statements)

References 18 publications

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“…The configuration option was fit for power-up regulation. A pressure drop with relevant fuel input increase option for rapid load rise was presented in [75]. A supercritical coal-fired power plant was modeled with an in-house developed code, to simulate a fast load change of 5%/30 s as a power-grid requirement.…”

Section: Ramping Ratementioning

confidence: 99%

“…During those, steady-state and transient data were collected. The simulations incorporated a quartet of ramping rates-2, 4, 8 and 16%/min-a 10%-load step change, and a A pressure drop with relevant fuel input increase option for rapid load rise was presented in [75]. A supercritical coal-fired power plant was modeled with an in-house developed code, to simulate a fast load change of 5%/30 s as a power-grid requirement.…”

Section: Ramping Ratementioning

confidence: 99%

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Review of Process Modeling of Solid-Fuel Thermal Power Plants for Flexible and Off-Design Operation

et al. 2020

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Since the widespread deployment of non-dispatchable, intermittent, and highly variable power production from renewable energy sources (RES), the demand for flexible power production has been steadily growing. As new-built dispatchable power plants have not been very quickly adapted to the emerging flexible operation, this task has been addressed by existing plants as well. Existing solid-fuel thermal power plants have undergone an extensive study to increase their flexible operation. Thermodynamic process-modeling tools have been extensively used for plant modeling. Steady- and transient-state simulations have been performed under various operating regimes, supplying valuable results for efficient power-plant operation. Flexibility aspects regarding low-load operation and steady operational conditions are mostly investigated with steady-state simulations. Flexibility aspects related to variation over time such as ramping rates are investigated with transient simulations. The off-design operation is mainly attributed to the existing fleet of power plants, struggling to balance between their former operational schemes as base and/or medium-load plants. However, off-design operation is also considered for new plants in the design phase and is included as a simulation aspect. Process modeling turns out to be a proven tool for calculating plant flexibility and predicting extreme operating conditions, defining further steps for a new operational scheme, drafting accident mitigation control procedures or, furthermore, provisioning more complex and cross-field future tasks. A review of the off-design aspect as a simulation approach is undertaken and presented in this work. Finally, challenges and future perspectives for this aspect of solid-fuel thermal power plants are discussed.

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Section: Ramping Ratementioning

confidence: 99%

Section: Ramping Ratementioning

confidence: 99%

Review of Process Modeling of Solid-Fuel Thermal Power Plants for Flexible and Off-Design Operation

et al. 2020

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“…The effect of different parameters of the emergency supply pump on the safety of the heating surfaces was carefully investigated; however, in the model, the heat fluxes to the heating surfaces were simply derived from experimental data, making it difficult to be applied to other boilers despite having similar structures. Other studies have also been conducted on the transient process in supercritical boilers [12][13][14][15][16][17][18][19][20]; however, they are of little referential significance.…”

Section: Introductionmentioning

confidence: 99%

Safety Analysis on the Heating Surfaces in the 660 MW Ultra-Supercritical CFB Boiler under Sudden Electricity Failure

et al. 2022

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Ultra-supercritical circulating fluidized bed (CFB) boilers are taking up an increasing proportion of the CFB boiler fleet in China, making the safety concern about the heating surfaces in this type of boilers under sudden electricity failure draw more and more attention from the industry. For the time being, however, few studies have made efforts to resolve this concern. Given this, the physical process in a 660 MW ultra-supercritical boiler during the electricity failure accident was precited with a comprehensive model composed of mass and energy conservation equations in this work. The tube temperature of the boiler components with the highest safety risk, i.e., the water wall and a superheater, was obtained to evaluate the safety of the heating surfaces. The results revealed that the tube temperature (about 516 °C and 544 °C) would be obviously lower than the maximum permissible temperature of the tube material (600 °C and 630 °C) even when electricity could be restored at the power plant, indicating that the heating surfaces in the 660 MW ultra-supercritical CFB boilers would generally be recognized to be safe under sudden electricity failure.

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“…The decline in the pressure reasons to a small portion of the saturated water in the boiler immediately vaporizes; this produces a large magnitude of boil-up from most of the boiler tubes. So that, the level controller sensing an elevation in the level of the pressure cycles of the drum will be caused variation in drum level [5].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of The Dynamic Effects in Upper Drum Boiler Under Steam Mass Flow Rate Variation

Mohammed¹,

Hussein²,

Numan³

2021

ETJ

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 Rapid rise in the steam mass flow rate causes the increase in dynamic effects.  The pressure disturbance in the boiler's upper drum cause mechanical effects.  Drum level fluctuations cause interactions with the controls of boiler combustion.  Interactions with the controls, resulting inefficient and dangerous operations.The dynamic effects in the "upper" drum of the boiler (mechanical's effects) are very complex problems and critical due to the pressure disturbance in the upper drum of the boiler. This work deals with an experimental investigation of the dynamic behavior of the boiler drum level system is reported from plant data (Al-Quds power plant) in Baghdad / Iraq under a particular condition of operating, and the mathematical equations of the boiler model variables explained and defined. The dynamic effects are investigated with increasing steam mass flow rate (10% and 20%) at the outlet of the boiler. The results showed that the rapid rise in the rate of steam mass flow causes the dynamic effects to increase (shrink and swell) by 15%, rates of evaporation and thus causes an increase in the volume of water inside the upper drum boiler that causes overheating in the tubes.

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Simulation of rapid increase in the steam mass flow rate at a supercritical power boiler outlet

Cited by 27 publications

References 18 publications

Review of Process Modeling of Solid-Fuel Thermal Power Plants for Flexible and Off-Design Operation

Review of Process Modeling of Solid-Fuel Thermal Power Plants for Flexible and Off-Design Operation

Safety Analysis on the Heating Surfaces in the 660 MW Ultra-Supercritical CFB Boiler under Sudden Electricity Failure

An Experimental Investigation of The Dynamic Effects in Upper Drum Boiler Under Steam Mass Flow Rate Variation

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