Mechanism analysis on the pulverized coal combustion flame stability and NOx emission in a swirl burner with deep air staging

Zhou, Chaoyang; Wang, Yongqiang; Jin, Qiye; Chen, Qijuan; Zhou, Yuegui

doi:10.1016/j.joei.2018.01.006

Cited by 78 publications

(24 citation statements)

References 26 publications

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“…where ϕ RS , ϕ P , ϕ DC , ϕ C and ϕ CA refer to the energy efficiencies for the Raw Material Grinding and SP unit, Preheating unit, Decomposition and Clinker Calcination unit, Cooling unit and Coal Grinding and AQC unit, respectively. The thermal efficiency model given in (11) shows that ϕ QY has a positive linear correlation with the thermal efficiencies of all five subunits, meaning that an increase in the thermal efficiency of any subunit will lead to an increase in ϕ QY .…”

Section: Modeling Of the Thermal Efficiency Of The Whole Cement Clinkmentioning

confidence: 99%

“…To quantitatively analyze the influence of the individual thermal efficiencies of each subunit on the whole system ϕ QY , the mutual influence of the thermal efficiency between subunits must be controlled-it is hereby assumed that the change in thermal efficiency of one subunit will not affect the thermal efficiency of another subunit. On this basis, the thermal efficiency of one subunit ϕ i was maneuvered with an increase or decrease by an increment of 2%, and the contribution of such changes to the thermal efficiency of the whole system ϕ QY was calculated according to the thermal efficiency model as given in (11); the result is shown in Figure 7. Table 3.…”

Section: Modeling Of the Thermal Efficiency Of The Whole Cement Clinkmentioning

confidence: 99%

“…In fact, considerable efforts have been made to improve the performance of various thermal devices as adopted in cement clinker production to reduce fuel consumption [8,9]. Typical examples include implementation of large scale NSP (New Suspension Preheater) kilns and high-performance burners, the development of advanced raw meal preheaters and calciner units based on "high solid-gas ratio technology" and other efforts to develop production lines with external processing of coal grinding and raw meal drying to retrieve the thermal energy exiting the flues [10][11][12][13]. It is worth noting that research has been recently conducted to develop intelligent control tools for the same purpose [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Modeling of the Thermal Efficiency of a Whole Cement Clinker Calcination System and Its Application on a 5000 MT/D Production Line

2020

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This paper proposes that the scope of research should be extended to the whole clinker calcination system from its single device or specific process (i.e., its functional subunits) as conventionally conducted. Mass/heat flow and effective heat were first analyzed to obtain the thermal efficiencies of its subunits (φi); a thermal efficiency model of the whole system φQY was thus established by correlating the relationship between φi and φQY. The thermal efficiency model of the whole system showed that φi had a positive linear correlation with φQY; it was found that the thermal efficiency of the decomposition and clinker calcination unit (φDC) had the greatest weight on φQY, where a 1% increase in φDC led to a 1.73% increase in φQY—improving φDC was shown to be the most effective way to improve φQY. In this paper, the developed thermal efficiency model was applied to one 5000 MT/D production line. It was found that its φQY was only 61.70%—about 2.35% lower than a representative line; such decrease was caused by its low φDC and φP which, as disclosed by model, were derived from the low decomposition rate of calcium carbonate in preheated meal put into a calciner and the high excess air coefficient of secondary air. Controlled parameter optimization of this 5000 MT/D production line was then carried out. As a result, the φDC and φP of the production line were increased from 30.03% and 64.61% to 30.69% and 65.69%, respectively; the φQY increased from 61.70% to 62.55%; the clinker output of the production line increased from 5799 MT/D to 5968 MT/D; the heat consumption of clinker was reduced from 3286.98 kJ/kg·cl to 3252.41 kJ/kg·cl.

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Section: Modeling Of the Thermal Efficiency Of The Whole Cement Clinkmentioning

confidence: 99%

Section: Modeling Of the Thermal Efficiency Of The Whole Cement Clinkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling of the Thermal Efficiency of a Whole Cement Clinker Calcination System and Its Application on a 5000 MT/D Production Line

2020

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“…e air field, gas-particle flow and combustion characteristic of the swirl burner (CFR) were researched by Chen et al [7,8]. Also, Zhou et al [9] numerically analyzed that flame stability and the NO x formation mechanism depend on the flow and combustion characteristic of the swirl burner (HT-NR3). us, the influences of the swirl burner different variable (such as operating conditions and burner structure) on PC combustion were investigated by the flow and combustion characteristic.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Inner and Outer Secondary Air Ratios on the Combustion Characteristic and Flame Shape of a Swirl Burner with a Prechamber

Liu

Niu

Wang

et al. 2020

Journal of Chemistry

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The swirl burner with a prechamber was used in a 14 MW pulverized-coal combustion experiment to investigate the influence of inner and secondary air ratios (ISA/OSA) on the combustion characteristic and flame shape in this work. The temperatures and species concentrations in the prechamber were measured via the flue gas analyzer and thermocouples. The flame shape beyond the prechamber outlet was captured by using a high-speed camera. The results showed that the combustion efficiency was increased and low nitrogen combustion was achieved by adopting the swirl burner with a prechamber. The high temperature corrosion and slagging phenomenon did not occur in the prechamber. The influence of ISA/OSA on temperature and species concentration profiles at different areas in the prechamber was different. The flame shape size exhibited an inflection point with increasing ISA/OSA. Considering, comprehensively, the temperature peak, near wall temperature, oxygen-free zone, CO concentration, flame length, flame diameter, and divergence angle, the case of ISA/OSA =1 : 2 had great processing on combustion efficiency and NOx emission. Thus, ISA/OSA = 1 : 2 was selected as the optimized case under experiment conditions.

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“…With the sustained combustion of fossil fuels in boilers and diesel vehicles, massive harmful emissions of nitrogen oxides (NO x ), mainly including NO and NO 2 , have been discharged into the atmosphere [1][2][3][4][5]. In recent decades, widespread serious environmental problems, such as urban smog, acid rain, and ozone depletion, have been caused from it [5][6][7]. To reduce the severe NO x emission, a number of techniques have been developed and utilized up to now, and the selective catalytic reduction (SCR) and the selective noncatalytic reduction (SNCR) stand out on account of the high denitration efficiency [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A Review of Urea Pyrolysis to Produce NH₃ Used for NO_x Removal

Wang

Dong

Niu

et al. 2019

Journal of Chemistry

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Urea pyrolysis, from which the denitration reactant ammonia is produced, plays an important role in the urea-based NOx removal process. Research into urea pyrolysis is mostly focused on three parts: urea pyrolysis pathway, catalytic hydrolysis of HNCO, and catalytic pyrolysis of aqueous urea solution. In this paper, detailed overview on research progress of urea pyrolysis was conducted. From the review, it could be concluded that although much research has been carried out, concentration was mainly in analysis of urea pyrolysis products and exploration of catalysts used to improve ammonia yields. Little work has been done on mechanism study and development of a kinetic model with high accuracy, which are still in great need nowadays.

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Mechanism analysis on the pulverized coal combustion flame stability and NOx emission in a swirl burner with deep air staging

Cited by 78 publications

References 26 publications

Modeling of the Thermal Efficiency of a Whole Cement Clinker Calcination System and Its Application on a 5000 MT/D Production Line

Modeling of the Thermal Efficiency of a Whole Cement Clinker Calcination System and Its Application on a 5000 MT/D Production Line

Influence of the Inner and Outer Secondary Air Ratios on the Combustion Characteristic and Flame Shape of a Swirl Burner with a Prechamber

A Review of Urea Pyrolysis to Produce NH₃ Used for NO_x Removal

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Mechanism analysis on the pulverized coal combustion flame stability and NOx emission in a swirl burner with deep air staging

Cited by 78 publications

References 26 publications

Modeling of the Thermal Efficiency of a Whole Cement Clinker Calcination System and Its Application on a 5000 MT/D Production Line

Modeling of the Thermal Efficiency of a Whole Cement Clinker Calcination System and Its Application on a 5000 MT/D Production Line

Influence of the Inner and Outer Secondary Air Ratios on the Combustion Characteristic and Flame Shape of a Swirl Burner with a Prechamber

A Review of Urea Pyrolysis to Produce NH3 Used for NOx Removal

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A Review of Urea Pyrolysis to Produce NH₃ Used for NO_x Removal