Influence of type of burner on NO emissions for pulverized coal preheating method

Liu, Changchun; Suo, Hui; Zhang, Xiaolu; Wang, Denghui; Zhuang, Huiyong; Wang, Xueyao

doi:10.1016/j.applthermaleng.2015.03.081

Cited by 40 publications

(13 citation statements)

References 10 publications

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“…Common denitration technologies include denitration during combustion and denitration after combustion. Denitration in combustion mainly includes air staged combustion, fuel staged combustion, and moderate or intense low oxygen dilution (MILD) combustion et al However, a large number of literature survey results indicate that the lowest NO x emission level that can be achieved during coal combustion with these technologies is between 100 and 400 mg/m 3 (@ 6% O 2 ) 5–11 . Postcombustion denitration mainly includes selective noncatalytic reduction technology (SNCR), selective catalytic reduction technology (SCR), or SCNR + SCR.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on ultra‐low NO_x emissions from pulverized coal preheating combustion

Zhang

Zhu

Lyu

et al. 2020

Asia-Pacific J Chem Eng

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Realizing ultra‐low NOx emissions during coal combustion is currently a development trend and technical bottleneck of coal combustion technology. To further exploit the low‐nitrogen potentialities in preheating combustion technology, the preheating characteristics, combustion characteristics, and NOx emission characteristics of pulverized coal, after changing operating parameters such as the air equivalence ratio of circulating fluidized bed, preheating temperature, combustion temperature, and air equivalence ratio in the reduction zone, are explored. The experimental results show that changing the operating parameters has a great impact on the composition of high‐temperature coal gas, the particle size, apparent morphology, and specific surface area of the high‐temperature preheated char after preheating. Properly adjusting the operating parameters can effectively reduce NOx emissions. Based on the explored principle, experiments were designed, and the goal of reducing the initial NOx emissions from coal combustion to less than 50 mg/m3 (the average emissions were 46 mg/m3 [@ 6% O2]) was successfully achieved. The research of this paper provides the most basic experimental guidance and theoretical support for achieving ultra‐low NOx emissions during the engineering pulverized coal combustion.

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Section: Introductionmentioning

confidence: 99%

Experimental study on ultra‐low NO_x emissions from pulverized coal preheating combustion

Zhang

Zhu

Lyu

et al. 2020

Asia-Pacific J Chem Eng

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“…With this technology, Zhou et al achieved ultralow NO x emissions (<50 mg/m 3 at 6% O 2 ) in a pilot-scale test rig . The All-Russian Thermal Engineering Institute developed a novel gas-fired coal preheating technology (GFCP) and showed its ability on NO x reduction compared to conventional PC combustion. , Liu et al conducted in-depth research on the technology and gained a vast amount of useful conclusions. − …”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Combustion Characteristics and NO_x Emission of Three Kinds of Solid Fuels Preheated by a Self-Preheating Burner

et al. 2019

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As a novel technology, coal preheating technology has been proved to be effective on NO x reduction by previous experiments. However, the role of some components of the fuel is still not clear in the preheating process and combustion process. To clarify the effects of volatile and carbon on NO x formation and reduction, three fuels with different volatile contents were used, and the experiments were launched in a bench-scale coal preheating combustion test apparatus. Results showed that the self-preheating burner was widely adaptable to the fuels and the fuels could be stably preheated to be above 860 °C. The coal gas mainly containing the combustible components of CO, H2, and CH4 was generated in the self-preheating burner, accompanying with the high-temperature coal char. Due to the high contents of carbon and volatiles, more combustible components in coal gas could be yielded by the bituminous coal after being preheated. Most of the volatile matters and carbon were released into the coal gas, and the volatile-N was mainly converted into N2. Because of the reduction of CO and carbon in char, the NO x conversion rates were low enough of the bituminous coal and the semicoke, while the NO x conversion rate of the coal gasification fly ash was a little high for its low carbon content.

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“…This method has been confirmed to be effective for reducing NO X emission and can be stably implemented. A gas‐fired coal preheating (GFCP) technology was developed by the All‐Russian Thermal Engineering Institute and is considered a clean‐combustion technology . .…”

Section: Introductionmentioning

confidence: 99%

Flameless combustion behaviour of preheated pulverized coal

Ouyang

Zhu

2017

Can J Chem Eng

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A method for stable flameless combustion of pulverized coal based on coal preheating was recently proposed. The method involves the initial heating of pulverized coal to a temperature above 800 °C. The heated coal is then transferred into a combustion chamber, where it is mixed with secondary air injected at a high velocity to achieve flameless combustion. The flameless combustion behaviour of the preheated pulverized coal was experimentally investigated in a lab‐scale test apparatus. The results showed that stable flameless combustion of bituminous coal and two different anthracite coals could be achieved. The temperature of the combustion chamber was also observed to be homogeneous. The peak temperature was below 1250 °C, while the average combustion temperature was about 1150 °C. The normalized root mean square temperature fluctuation over the combustion chamber is 7.0 %, 6.7 %, and 6.8 % for the three different coals. The colour of the entire combustion chamber was a faint yellow with no obvious flame front surface observed. Fuel preheating was found to be effective for improving the combustion efficiency, with values of 99.2 %, 98.3 %, and 97.9 % achieved for bituminous coal and two different anthracite coals, respectively. The experimental data further revealed that the NOX emissions for all the considered coals were very low compared to the corresponding cases of traditional combustion, with the values for the different coal types also significantly varying. The NOX emissions were determined to be 232, 187, and 165 mg/Nm3 (6 % O2) for bituminous coal and two different anthracite coals, respectively.

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Influence of type of burner on NO emissions for pulverized coal preheating method

Cited by 40 publications

References 10 publications

Experimental study on ultra‐low NO_x emissions from pulverized coal preheating combustion

Experimental study on ultra‐low NO_x emissions from pulverized coal preheating combustion

Experimental Research on Combustion Characteristics and NO_x Emission of Three Kinds of Solid Fuels Preheated by a Self-Preheating Burner

Flameless combustion behaviour of preheated pulverized coal

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Influence of type of burner on NO emissions for pulverized coal preheating method

Cited by 40 publications

References 10 publications

Experimental study on ultra‐low NOx emissions from pulverized coal preheating combustion

Experimental study on ultra‐low NOx emissions from pulverized coal preheating combustion

Experimental Research on Combustion Characteristics and NOx Emission of Three Kinds of Solid Fuels Preheated by a Self-Preheating Burner

Flameless combustion behaviour of preheated pulverized coal

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Product

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Experimental study on ultra‐low NO_x emissions from pulverized coal preheating combustion

Experimental study on ultra‐low NO_x emissions from pulverized coal preheating combustion

Experimental Research on Combustion Characteristics and NO_x Emission of Three Kinds of Solid Fuels Preheated by a Self-Preheating Burner