Thermal process and NO emission reduction characteristics of a new-type coke oven regenerator coupled with SNCR process

Zhao, Yujie; Feng, Jianmin; Chen, Yanmei; Fan, Huanbao; Bai, Wei

doi:10.1016/j.fuel.2021.121510

Cited by 21 publications

(10 citation statements)

References 22 publications

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“…The regenerative coupled SCR process includes delayed flow, heat transfer, component evaporation and SCR catalytic reaction. The corresponding governing equations of this process have been described in previous work [29,30].…”

Section: Governing Equationmentioning

confidence: 99%

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Coupling selective catalytic reduction process inside a coke oven regenerator: The influence of mixing parameters on NO reduction

et al. 2022

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Many coking plants have adopted the process of preheating flue gas to apply medium and low-temperature SCR denitrification technology, which increases the NOx treatment cost, fuel consumption, and generates secondary pollutants. Based on the unique temperature distribution characteristics of the coke oven regenerator, this work proposes a method for synergizing SCR inside the regenerator to remove NOx. A three-dimensional numerical model of the synergy between heat storage and SCR reaction was constructed to study the influence of mixing parameters (atomization angle, injection velocity, nozzles number) on the NO reduction and NH3 distribution. The validity of the model was verified. The results showed that the uneven distribution of NH3 near the catalytic layer and the small SCR coating area limited the NO reduction efficiency. Increasing the number of nozzles was more beneficial than the injection velocity and atomization angle for improving the NH3 distribution uniformity and NO reduction efficiency, achieving a maximum NO reduction efficiency of 37.1% (reduced to 251.6 mg/m3). Further research found that the NO reduction capacity of the cooperative SCR model cannot exceed 36% without changing the thermal storage brick structure. When the inlet NO concentration is less than 235 mg/m3, the reaction model ensures that the outlet NO concentration meets the national emission standards.

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Section: Governing Equationmentioning

confidence: 99%

“…Therefore, 580000 grids were finally selected for calculatio. Mesh independence verification and meshing results were presented in previous work [29]. The SIMPLE algorithm was used to solve the momentum equation's pressure-velocity coupling problem.…”

Section: Mesh Divisionmentioning

confidence: 99%

Coupling selective catalytic reduction process inside a coke oven regenerator: The influence of mixing parameters on NO reduction

et al. 2022

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“…2b). To ensure good denitration efficiency, the reactor temperature was preset at a higher temperature of 900 °C to enhance selective non-catalytic reduction (SNCR) of NO x by ammonia [28]. At the same conditions as employed above, the combustion of OSC was conducted in combination with SNCR of NO x by injection of aqueous ammonia at an NH 3 /NO x molar ratio of 1:1.…”

Section: Independent Osr Combustion With Selective Non-catalytic Redu...mentioning

confidence: 99%

Co‐Combustion of Oil Sludge Char and Brown Coal in a Continuous Fluidized‐Bed Combustor

Shi

Qiao

Zhang

et al. 2022

Chemie Ingenieur Technik

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Ing. Joachim Werther on the occasion of his 80th birthdayFor developing technologies for innocent disposal of/energy recovery from high-ash oil sludge char (OSC), it was continuously combusted in a 10 kg h -1 fluidized-bed combustor. Addition of brown coal (BC) improved its combustion, but excessive BC was prone to cause slagging. Fine coke particles in OSC and volatiles in BC led to staged temperatures along the fluidized bed through air-staging co-combustion, enabling excellent combustion performance as well as efficient NO x reduction, especially when coupled with selective non-catalytic reduction. Thus, there is a potential to cleanly recover energy from OSC by its co-combustion with BC.

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“…6−8 SNCR is operated at 1120−1380 °C without a catalyst 9 and suffers from secondary pollution induced by ammonia escape as well. 10 Unlike SCR and SNCR, the complexing absorption method, as an important wet denitration process, not only can be conducted at room temperature, but also has a denitration efficiency exceeding 97%. 11,12 Fe(II)EDTA is a typical and renewable complex absorbent, in which Fe(II) coordinates with NO rapidly to form complex NO, namely Fe(II)EDTA(NO).…”

Section: ■ Introductionmentioning

confidence: 99%

“…Currently, selective catalytic reduction (SCR) and selective noncatalytic reduction (SNCR) , are applied widely as mature NO removal technologies. The SCR method converts NO into N 2 at 200–400 °C and is plagued by ammonia escape and catalyst deactivation. − SNCR is operated at 1120–1380 °C without a catalyst and suffers from secondary pollution induced by ammonia escape as well . Unlike SCR and SNCR, the complexing absorption method, as an important wet denitration process, not only can be conducted at room temperature, but also has a denitration efficiency exceeding 97%. , Fe(II)EDTA is a typical and renewable complex absorbent, in which Fe(II) coordinates with NO rapidly to form complex NO, namely Fe(II)EDTA(NO). , However, the denitration effect of the complexing absorption method is weakened with the gradual saturation of Fe(II)EDTA.…”

Section: Introductionmentioning

confidence: 99%

Membrane-less Paired Electrolysis for Cooperative Conversion of Complex NO in a Complexing Absorption System

Jin

Wang

Sun

et al. 2022

Ind. Eng. Chem. Res.

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The complexing absorption method serves as an important wet process for potential application in NO removal of industrial exhaust gas. However, gradual saturation of the absorbent severely limits its continuous operation and denitration efficiency. Herein, a membrane-less paired electrolysis (MLPE) process was first introduced for cooperative conversion of complex NO, thereby regenerating the absorbent. Fe(II)EDTA(NO) was converted on the anode and cathode directly and indirectly; namely, complex NO was not only oxidized to NO3 –, but also reduced to NH4 +, N2, and N2O. Furthermore, NO3 – and NH4 + acted as the potentially valuable products for further reclamation and utilization. Compared with membrane anodic electrolysis (MAE) and membrane cathodic electrolysis (MCE) systems, the MLPE system achieved the lowest energy consumption and highest conversion efficiency of Fe(II)EDTA(NO). Finally, the influences of key process parameters on the complex NO electro-conversion were investigated. The MLPE process provided an efficient and convenient strategy for electro-conversion of complex NO together with absorbent regeneration and NO resource utilization.

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Thermal process and NO emission reduction characteristics of a new-type coke oven regenerator coupled with SNCR process

Cited by 21 publications

References 22 publications

Coupling selective catalytic reduction process inside a coke oven regenerator: The influence of mixing parameters on NO reduction

Coupling selective catalytic reduction process inside a coke oven regenerator: The influence of mixing parameters on NO reduction

Co‐Combustion of Oil Sludge Char and Brown Coal in a Continuous Fluidized‐Bed Combustor

Membrane-less Paired Electrolysis for Cooperative Conversion of Complex NO in a Complexing Absorption System

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