Combustion characteristics and NO  formation of a retrofitted low-volatile coal-fired 330 MW utility boiler under various loads with deep-air-staging

Song, Li; Chen, Zhichao; He, Erdemtu; Jiang, Baocheng; Li, Zhengqi; Wang, Qingxiang

doi:10.1016/j.applthermaleng.2016.08.159

Cited by 72 publications

(12 citation statements)

References 24 publications

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“…Zhao et al 12 pointed that the NO x emission under 50% turbine heat acceptance (THA) load was higher than that under 70% THA based on a USC corner‐fired tower‐type boiler. On the contrary, Li et al 10 concluded that NO x emission descended with the decrement of boiler load, which agreed with the results of Qi et al 11 Thus, it is necessary to investigate the NO x emission under variable load conditions. In addition, the detailed temperature, velocity, species, and heat flux distribution of boiler are beneficial to the design, optimization, and transformation of pulverized coal combustion system.…”

Section: Introductionsupporting

confidence: 68%

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Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler

Deng

Zhang

et al. 2021

Asia-Pacific J Chem Eng

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Ultra‐supercritical double‐reheat technology, as one of the most advanced coal‐fired power generation technology, is an important direction for emission reduction and energy saving in the world. In this study, the numerical calculation was executed in a 660‐MW ultra‐supercritical double‐reheat tower‐type boiler under deep‐air‐staging conditions. The refined HCN oxidation model was adopted to substitute the default model implemented by the user‐defined functions to calculate the NOx emission. The influences of the boiler load, over‐fire air (OFA) ratio, and excess air coefficient on temperature, species, and heat flux distributions were investigated. Results show that the decrement of the boiler load from boiler maximum continuous rating to 50% turbine heat acceptance gives rise to an increase of NOx emission. The heat flux distributions along with the furnace width direction present bell shaped. When the OFA ratio rises from 17% to 43%, NOx emission descends from 357.7 to 179.3 mg m−3 at the furnace outlet, and the heat flux distributions become more uniform along with the furnace width direction with lower peaks. Temperatures, species, and heat flux distributions are similar under the three different excess air coefficients. The NOx emission is the lowest when the excess air coefficient is 1.15. The results could provide a reference for combustion characteristics optimization and hydrodynamic calculation of ultra‐supercritical double‐reheat tower‐type boiler.

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Section: Introductionsupporting

confidence: 68%

“…The influences of boiler loads on temperature, species distribution, and NO x emission were studied by several researchers 10–12 due to the frequent peak‐shaving. However, a consensus has not yet been reached on the NO x emission at different boiler loads.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler

Deng

Zhang

et al. 2021

Asia-Pacific J Chem Eng

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“…The oxygen component of flue gas is monitored by a MSI-Compact flue gas analyzer (Drägerwerk AG & Co., Lübeck, Germany) with an accuracy of ±0.3 vol %. The experimentally obtained NO data were converted to the standard of 6% O 2 according to the Equation (2) [27]:…”

Section: Experimental Setup and Research Methodsmentioning

confidence: 99%

“…Moreover, in order to improve the capacity of renewable energy sources, developing deep peaking transformation for coal-fired power plant is meaningful [26]. Some researchers have studied combustion characteristics under different loads, including ignition and NO x formation [15,27]. Nonetheless, how to use burner flaring for improving ignition under different loads is still less reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Combustion Characteristics and NOx Emission through a Swirling Burner with Adjustable Flaring Angle

et al. 2018

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A swirling burner with a variable inner secondary air (ISA) flaring angle β is proposed and a laboratory scale opposed-firing furnace is built. Temperature distribution and NOx emission are designedly measured. The combustion characteristics affected by variable β are experimentally evaluated from ignition and burnout data. Meanwhile, NOx reduction by the variable β is analyzed through emissions measurements. Different inner/outer primary coal-air concentration ratios γ, thermal loads and coal types are considered in this study. Results indicate that β variation provides a new approach to promote ignition and burnout, as well as NOx emission reduction under conditions of fuel rich/lean combustion and load variation. The recommended β of a swirling burner under different conditions is not always constant. The optimal βopt of the swirling burner under all conditions for different burning performance are summarized in the form of curves, which could provide reference for exquisite combustion adjustment.

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“…The NO x is produced mainly in the processes where the fuel is combusted in a combustor at high temperatures with the high amount of N 2 . The mechanisms of NO x formation are known and they have been widely discussed in literature [1][2][3][4][5]. Over the various NO x sources, the stationary and mobile ones have the most significant impact on environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

DeNOx Abatement Modelling over Sonically Prepared Copper USY and ZSM5 Structured Catalysts

et al. 2017

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Abstract:Metallic supports play an important role as structured reactor internals. Due to their specific properties including enhanced heat and mass transport, high mechanical resistivity and elimination of local hot-spots, they are commonly used in gas exhaust abatement from stationary and automotive industries. In this study, the performance of three structured supports with deposited Cu/USY (Ultrastabilised Y-zeolite) for deNO x abatement were modelled. Based on kinetic and flow resistance experimental results, the one-dimensional (1D) model of structured reactor was developed. The performance of the structured reactors was compared by the length of the reactor necessary to achieve an arbitrary 90% NO x conversion. The performed simulations showed that the sonochemically prepared copper USY and ZSM-5 zeolites deposited on metallic supports may be successfully used as catalysts for deNO x process.

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Combustion characteristics and NO formation of a retrofitted low-volatile coal-fired 330 MW utility boiler under various loads with deep-air-staging

Cited by 72 publications

References 24 publications

Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler

Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler

Combustion Characteristics and NOx Emission through a Swirling Burner with Adjustable Flaring Angle

DeNOx Abatement Modelling over Sonically Prepared Copper USY and ZSM5 Structured Catalysts

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