Utilization of Drum Boilers’ Storage Capacity for Flexible Operation

Majanne, Yrjö; Yli-Fossi, Timo; Korpela, Timo; Nurmoranta, Maria; Kortela, Jukka

doi:10.1016/j.ifacol.2017.08.186

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…So far, the model for the boiler dynamics comprises: (i) the four conservation of mass equations, (1)-( 4), (ii) the two equations derived from the constant volume of the drum and risers, (11) and (13), and (iii) the two equations derived from energy balance in the drum and in the risers, (21) and (25). Here an expression for boiler pressure, P , will be derived based only on the latter four equations.…”

Section: A Model For Boiler Pressurementioning

confidence: 99%

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A Nonlinear Dynamic Boiler Model accounting for Highly Variable Load Conditions

Carrasco¹,

Goodwin²,

D.³

2020

Preprint

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This paper describes a new nonlinear dynamic model for a natural circulation boiler. The model is based on physical principles, i.e. mass, energy and momentum balances. A systematic approach is followed leading to new insights into the physics of drum water level and downcomer mass flow. The final model captures fast dynamic responses that are necessary to describe the operation of a boiler under highly variable load conditions. New features of the model include (i) a multi-compartment model for the risers, (ii) a new model for drum water level, and (iii) a new dynamic model for the flow of water in the downcomers. Implications of the model for control system design are also explored.

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Section: A Model For Boiler Pressurementioning

confidence: 99%

“…Dynamic models for Boilers have appeared in the literature for decades [2,9,10,12,13,14]. Early work focused on obtaining empirical models capable of describing the internal dynamics with a certain degree of accuracy [5,6].…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Dynamic Boiler Model accounting for Highly Variable Load Conditions

Carrasco¹,

Goodwin²,

D.³

2020

Preprint

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“…Control strategies for the waterside were proposed to improve the transient operation of a CFB boiler (Henderson, 2014). Majanne et al (Majanne et al, 2017) suggested using the energy storage capacity of the drum boiler to produce extra steam by a sudden decrease of the drum pressure. Beiron et al (Beiron et al, 2019) investigated the settling times on the waterside in dependence of changes of the boundary conditions (e.g., heat input to the waterside) by numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Acceleration of Load Changes by Controlling the Operating Parameters in CFB Co-Combustion

et al. 2021

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The integration of intermittent renewable energy sources into the electricity market requires flexible and efficient technologies that compensate for the fluctuating electricity demand. A circulating fluidized bed (CFB) boiler is a suitable solution due to its fuel flexibility, but the thermal inertia of the fluidized bed can have negative effects on the load following capabilities. This study investigates the influence of the operating parameters of the fire side on the speed of load changes on the waterside. Co-combustion of lignite, straw, and refuse derived fuel (RDF) was carried out. In a 1 MWth pilot CFB combustor fifteen load changes were performed with a varying step input of the primary air, the secondary air, and the fuel mass flow. The step input of the primary air had a large influence on the load ramps, as it strongly affects the solids concentration in the upper furnace. The step size of the fuel mass flow had a positive effect on the load change rate. Based on the results, concepts were developed to accelerate load ramping by controlling the hydrodynamic conditions and the temperature on the fireside.

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