Experimental study on NOx emission characteristics of oxy-biomass combustion

Shah, Imran Ali; Gou, Xiang; Zhang, Qiyan; Wu, Jinxiang; Wang, Enyu; Liu, Yingfan

doi:10.1016/j.jclepro.2018.07.022

Cited by 66 publications

(18 citation statements)

References 41 publications

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“…In modeling the oxy biomass combustion, NO produced by the model does not actually represent the exact NO x formation. To accurately determine the fuel nitrogen conversion into NO x , the RStoic model was introduced into the flue gas flow channel based on our previous experimental work [46]. The detailed reaction mechanism occurring in the RStoic reaction model involves the conversion of fuel nitrogen into fuel NO x or elemental nitrogen, as illustrated in Section 2.3.1.…”

Section: Simulation Modelmentioning

confidence: 99%

“…NO x formation from fuel nitrogen depends on various factors such as residence time, temperature and char particle size. The fate of fuel nitrogen contributing to the formation of NO or N 2 is illustrated in Figure 2 (as part of our previous work) [46]; the conversion rate to NO for a maize stalk biomass fuel was considered in the present simulation study. part of our previous work) [46]; the conversion rate to NO for a maize stalk biomass fuel was considered in the present simulation study.…”

Section: Reaction Mechanismmentioning

confidence: 99%

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Simulation Study of an Oxy-Biomass-Based Boiler for Nearly Zero Emission Using Aspen Plus

Shah

Gou

2019

Energies

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Bioenergy integrated CO2 capture is considered to be one of the viable options to reduce the carbon footprint in the atmosphere, as well as to lower dependability on the usage of fossil fuels. The present simulation-based study comprises the oxy bio-CCS technique with the objective of bringing about cleaner thermal energy production with nearly zero emissions, CO2 capture and purification, and with the ability to remove NOx and SO2 from the flue gas and to generate valuable byproducts, i.e., HNO3 and H2SO4. In the present work, a simulation on utilization of biomass resources by applying the oxy combustion technique was carried out, and CO2 sequestration through pressurized reactive distillation column (PRDC) was integrated into the boiler. Based on our proposed laboratory scale bio-CCS plant with oxy combustion technique, the designed thermal load was kept at 20 kWth using maize stalk as primary fuel. With the objective of achieving cleaner production with near zero emissions, CO2 rich flue gas and moisture generated during oxy combustion were hauled in PRDC for NOx and SO2 absorption and CO2 purification. The oxy combustion technique is unique due to its characteristic low output of NO sourced by fuel inherent nitrogen. The respective mechanisms of fuel inherent nitrogen conversion to NOx, and later, the conversion of NOx and SO2 to HNO3 and H2SO4 respectively, involve complex chemistry with the involvement of N–S intermediate species. Based on the flue gas composition generated by oxy biomass combustion, the focus was given to the fuel NOx, whereby different rates of NO formation from fuel inherent nitrogen were studied to investigate the optimum rates of conversion of NOx during conversion reactions. The rate of conversion of NOx and SO2 were studied under fixed temperature and pressure. The factors affecting the rate of conversion were optimized through sensitivity analysiês to get the best possible operational parameters. These variable factors include ratios of liquid to gas feed flow, vapor-liquid holdups and bottom recycling. The results obtained through optimizing the various factors of the proposed system have shown great potential in terms of maximizing productivity. Around 88.91% of the 20 kWth boiler’s efficiency was obtained. The rate of conversion of NOx and SO2 were recorded at 98.05% and 87.42% respectively under parameters of 30 °C temperature, 3 MPa pressure, 10% feed stream holdup, liquid/gaseous feed stream ratio of 0.04 and a recycling rate of the bottom product of 20%. During the simulation process, production of around four kilograms per hour of CO2 with 94.13% purity was achieved.

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Section: Simulation Modelmentioning

confidence: 99%

Section: Reaction Mechanismmentioning

confidence: 99%

Simulation Study of an Oxy-Biomass-Based Boiler for Nearly Zero Emission Using Aspen Plus

Shah

Gou

2019

Energies

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“…Thermal-NO x is primarily formed by the reaction of nitrogen and oxygen at high temperatures (>1300 • C) [3]. While the furnace temperature of household biomass stove is mostly lower than 700 • C (refer to previous studies [4,5]), fuel-NO x accounted for most of all NO x [6,7]. Fuel-N can be converted into various nitrogen-containing functional groups during the pyrolysis process, and these compounds can react with oxygen to produce various NO x species [8].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Migration during Pyrolysis of Raw and Acid Leached Maize Straw

Mou

Zou

et al. 2021

Sustainability

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Solid biofuel is considered as a possible substitute for coal in household heat production because of the available and sustainable raw materials, while NOx emissions from its combustion have become a serious problem. Nitrogen-containing compounds in pyrolysis products have important effects on the conversion of fuel-N into NOx-N. Understanding these converting pathways is important for the environmentally friendly use of biomass fuels. The nitrogen migration during pyrolysis of raw and acid leached maize straw at various temperatures was investigated in this study. Thermal gravimetric analysis and X-ray photoelectron spectroscopy were used to investigate the performances of thermal decomposition and pyrolysis products from samples. The main nitrogen functional groups in biomass and biochar products were N-A (amine-N/amide-N/protein-N), pyridine-N, and pyrrole-N, according to the findings. The most common gaseous NOx precursor was NH3, which was produced primarily during the conversion of N-A to pyridine-N and pyrrole-N. The formation of HCN mainly came from the secondary decomposition of heterocyclic-N at high temperatures. Before the pyrolysis temperature increased to 650 °C, more than half of the fuel-N was stored in the biochar. At the same pyrolysis temperature, acid-leached maize straw yielded more gas-N and char-N than the raw biomass. The highest char-N yield of 76.39 wt% was obtained from acid-leached maize straw (AMS) pyrolysis at 350 °C. Low pyrolysis temperature and acid-leaching treatment can help to decrease nitrogen release from stable char structure, providing support for reducing nitrogenous pollutant emissions from straw fuel.

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“…Previous research on the catalytic combustion of rice husk specifically, has been on the use of chemicals for rice husk fuel pretreatment to achieve energy efficiency [25], such as mineral acid pretreatment for the removal of impurities [26,27]. Studies have been conducted on specific gas emissions, such as NOx reduction through oxy biomass combustion technology [28]. However, studies on metallic honeycomb catalysts have been used to reduce emissions from vehicles in the automobile industry [21,24] and very few studies have investigated the performance of a metallic honeycomb catalyst on PM, CO, and SO 2 emission reduction from biomass combustion systems such as rice husks.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Temperature Effects on Conversion Efficiency of PM2.5 and Gaseous Emissions from Rice Husk Combustion

2021

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Most studies on honeycomb catalysts have been conducted using simulation models and exhaust experiments from automobiles. Very few monolithic catalyst studies have been applied to the agricultural sector, especially the catalyst exhaust system for flue purification from the biomass industry. The importance of exhaust gas purification and particulate removal from biomass power plants has become critical for evaluating the performance and environmental sustainability of biomass combustion. This is one of the first studies to investigate the performance of honeycomb catalysts for the oxidation of flue (PM2.5), (CO), and (SO2) from a rice husk briquette combustion system. The experimental setup comprised a fixed-bed electric furnace, the catalyst, an aerosol sampler, and a flue gas analyzer. Rice husk (0.1 g/mL density) and rice husk briquettes (0.8 g/mL density), were burned at 600–1000 °C for 3 min. From the results, the catalyst CO conversion rate was 100% at the optimum heated temperatures of 427.4–490.3 °C. At these temperatures, the inhibition effect of the chemisorbed CO was significantly minimized, enhancing the adsorption of oxygen, which reacted with CO to form CO2. However, SO2 oxidation was lower than that of CO because platinum-based catalysts are generally more attracted to CO in the presence of oxygen. The emission of PM2.5 decreased from its uncatalyzed-value (1169.9 mg/m3 and 1572.2 mg/m3) to its catalyzed values (18.9 mg/m3 and 170.1 mg/m3). This is a significant result in ensuring cleaner production of energy from rice husk.

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Experimental study on NOx emission characteristics of oxy-biomass combustion

Cited by 66 publications

References 41 publications

Simulation Study of an Oxy-Biomass-Based Boiler for Nearly Zero Emission Using Aspen Plus

Simulation Study of an Oxy-Biomass-Based Boiler for Nearly Zero Emission Using Aspen Plus

Nitrogen Migration during Pyrolysis of Raw and Acid Leached Maize Straw

Catalytic Temperature Effects on Conversion Efficiency of PM2.5 and Gaseous Emissions from Rice Husk Combustion

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