Flue Gas Purification Research Articles

Influences of magnetic field on the removal of submicron particles in electrostatic cyclone at different temperatures

Aiming at improving the capture performance of inner vortex electrostatic cyclone (ESC), which is widely used in the field of flue gas purification, magnetic field is introduced to remove submicron particles. The theoretical and physical models of electromagnetic dust removal were established, and the dust-removal efficiency of submicron particles under different temperatures and magnetic fields was numerically simulated by FLUENT. The results show that a rise in temperature leads to a reduction in the grade efficiency of submicron particles of ESC, a decrease in the number of escaped particles at lower temperature, and the differences of the rising amplitude in overall efficiency corresponding to the traditional cyclone, which were 36.7%, 34.8%, 33.8%, and 31.9% at four temperatures. The contribution of temperature to the capture of submicron particles decreases continuously with the increasing temperature, but that of magnetic field progressively increases at this time. The magnetic field environment is conducive to the capture of submicron particles, the removal effect is more obvious with the increase of magnetic flux density, but the ascended ranges of magnetic field and temperature both decrease when it reaches 0.5 T. These results can provide a theoretical basis and a technical reference for the design of ESC.

Investigation of the sulfur enrichment mechanism on the catalyst in the FCC process of waste tire pyrolytic oil

The high sulfur content of polymer solid waste (like waste tires) pyrolytic oil limits its application as feedstock in fluidized catalytic cracking (FCC), while there are fewer studies on the effect of sulfur on catalysts. To explore the mechanisms of sulfur enrichment on the catalyst, the distribution characteristics of sulfur in the spent catalysts were investigated and the conversion behavior of sulfur during the FCC process of the waste tire pyrolytic oil was analyzed. The results showed that the species of sulfur in the catalyst before and after the FCC process could be well distinguished by using combined physicochemical analysis method. Sulfur mainly existed in the form of sulfates in the spent catalysts and part of the sulfur was confirmed to be bound to the catalysts matrix. The enrichment of sulfur in the catalysts was probably due to the direct and indirect migration of sulfur compounds in waste tire pyrolytic oil in the catalytic cracking stage, rather than SO2 adsorption on the catalyst in the flue gas purification stage. Furthermore, it was suggested that the sulfur-containing compounds reacted with the oxygen-containing functional groups to form sulfones and/or sulfates on the surface of the catalysts. These findings contribute to the clean utilization of solid waste and to a better understanding of the catalyst deactivation mechanism in the FCC processes.

Cubic SAPO-34 supported MnOx for low-temperature gaseous mercury oxidation and adsorption from coal-fired flue gas

Gaseous elemental mercury (Hg0) from industrial flue gas is difficult to be synergistically removed by existing flue gas purification equipment. In this paper, Mn-based oxides were used for the modification of SAPO-34 molecular sieve to enhance Hg0 oxidation and adsorption performances. The results showed that when 5 % Mn dropped on the surface of SAPO-34, it had the highest Hg0 removal efficiency and exhibited a better Hg0 removal performance at lower temperature (<150 °C). SO2 would compete for active adsorption sites of Hg0, while H2O vapor had little influence on Hg0 removal. The Hg0 removal mechanism was discussed based on experiment and characterization results and density functional theory calculation. The larger surface area and pore volume of Mn/SAPO-34 benefited the physical adsorption process. The surface MnOx particles enhanced the oxidation of Hg0 to Hg2+ and the oxygen site can further bond with Hg2+ to form stable HgO. In addition, the larger desorption peak of HgO (487 °C) and the more negative adsorption energy (-1.21 eV) revealed the dominant role of chemical adsorption of Hg0 over Mn/SAPO-34. Thus, the Mn/SAPO-34 is a potential catalyst for Hg0 removal from industrial flue gas.

Performance on desulfurization and denitrification of one-step produced activated carbon for purification of sintering flue gas

An innovative one-step process for activated carbon production from low-rank coal is proposed in this research by applying oxidized pellets as activator. The new process can realize synchronous production of the activated carbon and direct reduction iron through combination of carbonization and activation of low-rank coal in one step while no solid wastes were discharged. The desulfurization and denitrification performance of the obtained activated carbon was also evaluated on the simulative sintering flue gas in comparison with one type of commercial activated carbon. The results indicated that a superior activated carbon with high specific surface area of 370.42 m2 g−1, iodine sorption value of 695.13 mg g−1, compressive strength of 315 N·per−1and abrasive resistance of 96.61%, can be prepared under suitable conditions of activation temperature at 850 °C for 140 min with C/Fe mass ratio of 2.5. Meanwhile, the direct reduction iron has a metallization ratio of 88.31%. The activated carbon has a preferable desulfurization performance with the breakthrough sulfur capacity of 5.463 mg/g and breakthrough time of 46.33 min, and single denitrification performance with the breakthrough nitric capacity of 1.935 mg/g and breakthrough time of 90.17 min at flue gas temperature of 80 °C, airspeed ratio of 8370 h−1, gas flow of 1.8 m3/h, and oxygen concentration of 16%. The denitrification of activated carbon in the simultaneous desulfurization and denitrification process can be improved by catalytic reduction via the transformation from NO to N2. The good results show that this process has a bright future with high technical and economic feasibility.

Simultaneous desulfurization and denitrification of flue gas enabled by hydrojet cyclone

Boiler flue gas in the chemical industry contains SO2 and nitrogen oxides (NOx). These flue gases not only pollute the environment, but also seriously endanger human health. In this work, we studied the process of jet atomization and swirl enhancement. Then we constructed a miniaturized hydrojet cyclone. After that, we proposed a new type of flue gas purification technology to achieve integrated and efficient desulfurization and denitrification. All studies were based on combining the liquid jet field with the three-dimensional swirl field to increase the mass transfer area of the gas and liquid phases. The industrial sideline test results showed that the gas purification efficiency increased with the increase of inlet velocity and absorption liquid flow rate, Efficiency is always above 80%. Increasing the concentration of activator could significantly improve the desulfurization efficiency by 27%. Increasing the concentration of oxidant was beneficial to denitrification, and the maximum denitrification efficiency of methyldiethanolamine (MDEA) was 98.2%. Overall, this technology can not only help enterprises save maintenance and treatment costs, but also protect the environment by avoiding the harm caused by flue gas pollution.

Probing the origin and stability of bivalency in copper based porous coordination network and its application for H2S gas capture

A bivalent Cu(I,II) metal–organic framework (MOF) based on the 4,4′,4″-s-Triazine-2,4,6-triyl-tribenzoate linker was synthesized via a solvothermal method. The MOF possessed 43.8% of the Cu sites as Cu+ with a surface area of 1257 m2 g−1. The detailed spectroscopic analysis confirmed dimethylformamide (DMF) solvent as the reductant responsible for Cu+ sites in the synthesized MOF. The Cu+ sites were easily accessible and prone to oxidation in hot water or acidic gas environment. The MOF showed water-induced structural change, which could be partially recovered after soaking in DMF solvent. The synthesized MOF showed a high hydrogen sulfide (H2S) uptake capacity of 4.3 mmol g–1 at 298 K and an extremely low H2S pressure of 0.0005 bar. The adsorption capacity was the highest among Cu-based MOFs with PCN-6-M being regenerable, which made it useful for deep desulfurization applications. The adsorbed H2S was mineralized to sulfide, sulfur, and sulfates, mediated by the Cu+/Cu2+ redox cycle in the presence of adsorbed water and molecular oxygen. Thus, the study confirmed that DMF as a reductant is responsible for the origin of bivalency in PCN-6-M and possibly in other Cu-based MOFs reported in the literature. Also, the developed MOF could be a potential candidate for flue gas desulfurization and gas purification applications.

Ammonia Abatement via Selective Oxidation over Electron-Deficient Copper Catalysts.

Selective catalytic ammonia-to-dinitrogen oxidation (NH3-SCO) is highly promising for the abatement of NH3 emissions from flue gas purification devices. However, there is still a lack of high-performance and cost-effective NH3-SCO catalysts for real applications. Here, highly dispersed, electron-deficient Cu-based catalysts were fabricated using nitrogen-doped carbon nanotubes (NCNT) as support. In NH3-SCO catalysis, the Cu/NCNT outperformed Cu supported on N-free CNTs (Cu/OCNT) and on other types of supports (i.e., activated carbon, Al2O3, and zeolite) in terms of activity, selectivity to the desired product N2, and H2O resistance. Besides, Cu/NCNT demonstrated a better structural stability against oxidation and a higher NH3 storage capacity (in the presence of H2O vapor) than Cu/OCNT. Quasi in situ X-ray photoelectron spectroscopy revealed that the surface N species facilitated electron transfer from Cu to the NCNT support, resulting in electron-deficient Cu catalysts with superior redox properties, which are essential for NH3-SCO catalysis. By temperature-programmed surface reaction studies and systematic kinetic measurements, we unveiled that the NH3-SCO reaction over Cu/NCNT proceeded via the internal selective catalytic reaction (i-SCR) route; i.e., NH3 was oxidized first to NO, which then reacted with NH3 and O2 to form N2 and H2O. This study paves a new route for the design of highly active, H2O-tolerant, and low-cost Cu catalysts for the abatement of slip NH3 from stationary emissions via selective oxidation to N2.

Removal of NO in flue gas simulated by the Fe2+/Cu2+-activated double oxidant system

ABSTRACT ⋅ O H The wet denitrification technology has a good development prospect due to its simple system and mild reaction conditions, and related research has become a hot topic in the field of flue gas purification. In this work, a novel simultaneous removal technology of NO from flue gas using Fe2+/Cu2+-catalytic H2O2/(NH4)2S2O8 system was developed for the first time. The feasibility of this new flue gas cleaning technology was explored through a series of experiments and performance analyses. The mechanism of oxidation products, free radicals and simultaneous removal of NO was revealed. The effects of the main process parameters on the removal of NO were investigated. Relevant results demonstrated that the removal efficiency of NO was elevated when the concentration of (NH4)2S2O8 or reacting temperature increased, while it was decreased after increasing the raising of Fe2+, Cu2+ and H2O2 concentrations. The main radicals were and· S O 4 − , using the electron spin resonance technique in the solution, and played a very important role in NO removal. The main products were carried out by ion chromatography and elemental N material accountancy, and the results showed that it was sulfate and nitrate in the solution, which provided theoretical guidance for the subsequent treatment and resource utilization of the absorption solution. The results of the study provided a theoretical basis for the industrial application of wet denitrification. Highlights A new green process of NO removal by a wet process with Fe2+/Cu2+ activated (NH4)2S2O8 system is proposed in this paper; Elimination mechanisms and paths of NO are elucidated; The synergistic role produced by Cu2+ and Fe2+ is beneficial to the purification of NO; The synergistic role produced by (NH4)2S2O8 and H2O2 increased the concentration of free radicals in the solution; This process jointly considers the enhanced removal of NO and recycling of transition metal ions.

Fabrication of robust SiC ceramic membrane filter with optimized flap for industrial coal-fired flue gas filtration

Silicon carbide (SiC) filter candles are particularly suitable for the purification of industrial coal-fired flue at high temperatures. However, the filters are prone to break due to the lack of bending strength, especially at the filter flap, which limits its application field and service life. In this work, the SiC filter candles with optimized flap for the removal of fly ash from the industrial coal-fired flue gas were presented. The bimodal particle size distribution of SiC powders were employed to prepare the SiC filter flap to increase the number of neck connections among the SiC particles. The bending strength of filter flap was enhanced from 18.0 MPa to 37.0 MPa while the gas permeability did not exhibit obvious decline. Besides, the SiC filter candles presented a good thermal shock resistance due to the similar coefficient of thermal expansion of SiC filter flap (5.6 × 10−6 /K, 300–450 °C) and pipe body (5.0 × 10−6 /K, 300–450 °C). When the dust-containing flue gas with high temperature (300–450 °C) passed through the SiC membrane filtration equipment, dust was removed efficiently, and downstream equipment were protected from blocking and fouling. When the surface velocity of flue gas was set at 0.8 m/min and the back flushing pressure was set at 0.6 MPa, the pressure drop was fairly stable with minor fluctuation from 2420 Pa to 2700 Pa. Meanwhile, the outlet dust concentration and filtration efficiency of coal-fired flue gas were below 5.0 mg/m3 and above 99.98 %, respectively. This work provided a robust and high-efficiency SiC filter for the purification of industrial flue gas containing submicron-sized solid particles.

Significance of ionic wind propulsion on charged particle removal during flue gas purification

Ionic wind propulsion plays a vital role in charged particle transport during flue gas purification, which is closely related to high-efficiency particulate removal. Here, we establish a comprehensive model to investigate the effect of ionic wind on the transport and deposition of charged particles. The high-speed ionic wind disturbs the space flow field in a meaningful way, which also causes the formation of ‘U'-shaped high-speed zones within the near-plate region. After the dusty flue gas enters the electrostatic field, due to the disturbance of high-speed ionic wind, apart from the electric force, particle transportation is acted by ionic wind propulsion. Charged particles can be significantly accelerated with ionic wind propulsion, while it also introduces an uneven distribution of deposited particles. Based on these findings, a novel electrostatic precipitator is proposed to optimize the space flow field, and the collection efficiency and dust layer shape are both significantly improved.

UTILIZATION OF POLYMER WASTE BY PYROLYSIS IN COMPOSITIONS WITH PEAT

There is an intensive growth of polymer production all over the world. Annually, the industry consumes more than 150 million tons of plastics 85 %, of which are thermoplastics and 15 % thermosetting polymers. According to experts, the consumption of plastics in the world has increased to 1 t/year per person, which has significantly exacerbated the problem of recycling and reuse of such waste underground disposal is the most environmentally unfavorable option associated with both the irretrievable loss of material and energy, and the gradual release of toxic substances (dioxins, furans). Less common is the energy, which is associated with the need for effective purification of flue gases from toxic combustion products, which is very costly.&#x0D; Pyrolysis is used as a prospective direction of polymer-containing waste recovery mixed combinations of peat with polymers requiring processing. The most representative and typical for the republic samples of polymer waste to be disposed&#x0D; of, were selected, followed by the preparation of mixed compositions based on them in various combinations of components with two types of peat (top and lowland), their thermal degradation was carried out under various pyrolysis conditions and the material balance of the products obtained was compiled. The qualitative and quantitative composition of pyrolysis products are estimated on the example of the gas phase. The efficiency of the method of utilization of mixed compositions with the production of more high-calorie thermal degradation products has been confirmed. It is revealed that the conversion depth of mixed compositions significantly depends on the pyrolysis conditions and the composition of the initial components.&#x0D; A method of utilization of polymer waste by pyrolysis of peat polymer compositions is proposed, which allows obtaining&#x0D; a resin fraction with a higher yield and pyrolysis gas with a significantly higher heat of combustion as an energy carrier,&#x0D; which gives reason to consider it as a highly efficient energy carrier in the production of thermal and electrical energy. The value of the resulting solid pyrolysis residue consists in the possibility of using it as both a building material and, in the future, raw materials for the manufacture of various sorbents.

Numerical study on the distribution of flue gas residence time in the desulfurization and denitrification system by the optimization of the model

Abstract During the operation of the CSCR activated carbon desulfurization and denitrification flue gas purification system, due to the unreasonable design of flue gas pipe diameter and the uneven distribution of activated carbon porosity, the uniformity of flue gas distribution is prone to problems, which affects flue gas removal efficiency and increases operating costs. In this article, the Fluent software was used to establish a three-dimensional numerical model of the flue gas purification system, and the flow characteristics of the flue gas were studied by continuously optimizing the structure of the system model. The effects of different pipe diameters, the accumulation method of activated carbon in the desulfurization and denitration module and the distribution of porosity on the flue gas are analyzed, and the effects on the average residence time and variance of flue gas were further analyzed. The results show that the average residence time, the variance, the dead volume fraction, and well-mixed volume decreased, while the dispersed plug volume fraction increased for a module after optimization. The average residence time and the dispersed plug volume fraction decreased. While the variance, the dead volume fraction, and well-mixed volume fraction increased for the system after optimization.

Oxidative coupling of methane (OCM) conversion into C2 products through a CO2/O2 co-transport membrane reactor

Oxidative coupling of methane (OCM), which transforms CH4 into C2 products (C2H6 and C2H4) with molecular O2 as the oxidant, is one of the most studied direct methane conversions (DMCs). However, a major technical hurdle to the OCM process is to achieve high CH4 conversion at high C2 (C2H6 and C2H4) selectivity. One rudimentary cause for this “tradeoff” behavior is the high chemical reactivity of the products (C2H6 or C2H4), which can be re-oxidized by O2. To overcome this thermodynamic challenge, minimizing the oxidizing power of the oxidant and lowering the local oxygen partial pressure are keys. In this work, we demonstrate a new membrane reactor that capture CO2/O2 from a flue gas and uses it for OCM conversion. The results show that the co-captured CO2/O2 mixture converts CH4 into C2H6 in the presence of a 2%Mn–5%Na2WO4/SiO2 catalyst, followed by thermal cracking of C2H6 into C2H4 and H2. The presence of CO2 decreases the local partial pressure of O2, thus reducing the propensity of C2-products re-oxidation and leading to a higher C2 selectivity. We show that a small button-type membrane reactor can achieve 12% C2 yield with ∼57% C2-selectivity using a diluted CH4-Ar mixture as the feedstock. We expect higher C2 yield with tubular plug-flow membrane reactors in the future. We also highlight the unique advantage of the membrane reactor in intensifying CO2 capture from both flue gas and OCM purification process into one single step.

Large-Scale Screening and Machine Learning for Metal-Organic Framework Membranes to Capture CO2 from Flue Gas.

To combat global warming, as an energy-saving technology, membrane separation can be applied to capture CO2 from flue gas. Metal–organic frameworks (MOFs) with characteristics like high porosity have great potential as membrane materials for gas mixture separation. In this work, through a combination of grand canonical Monte Carlo and molecular dynamics simulations, the permeability of three gases (CO2, N2, and O2) was calculated and estimated in 6013 computation–ready experimental MOF membranes (CoRE–MOFMs). Then, the relationship between structural descriptors and permeance performance, and the importance of available permeance area to permeance performance of gas molecules with smaller kinetic diameters were found by univariate analysis. Furthermore, comparing the prediction accuracy of seven classification machine learning algorithms, XGBoost was selected to analyze the order of importance of six structural descriptors to permeance performance, through which the conclusion of the univariate analysis was demonstrated one more time. Finally, seven promising CoRE-MOFMs were selected, and their structural characteristics were analyzed. This work provides explicit directions and powerful guidelines to experimenters to accelerate the research on membrane separation for the purification of flue gas.

Siloxane-modified MnOx catalyst for oxidation of coal-related o-xylene in presence of water vapor

In coal-combustion energy production, presence of water vapor in flue gas causes catalyst deactivation and leads to the release of large quantities of volatile organic compounds (VOCs). In this study, design of a low-temperature, hydrophobic catalyst for flue gas purification was achieved by modifying support material with inorganic siloxane. Introduction of 5% water vapor into simulated flue gas at 300 °C reduced oxidation efficiency for o-xylene removal by 26% with unmodified MnOx/γ-Al2O3 catalyst, whereas with modified catalyst MnOx-Si0.9/γ-Al2O3 oxidation efficiency was reduced by only 5%. MnOx-Si0.9/γ-Al2O3 exhibited stable catalytic efficiency for o-xylene gas oxidation containing water vapor for over 200 min. Water-resistance of the catalyst was effective for removal of multi-coal combustion pollutants (Hg0 and NO) and moreover, hydrophobicity of the catalyst led to a reduction in surface sulfate deposition, thereby lowering toxicity of SO2 from simulated flue gas. DRIFTS analysis showed that the hydrophobic catalyst surface not only reduces water adsorption, but also promotes water volatilization. Based on molecular adsorption energies, catalyst support modification with siloxane inhibits water adsorption and promotes organic adsorption and thus provides a new strategy for preparing water-resistant catalysts for flue gas purification.

Formation and control of dioxins during thermal desorption remediation of chlorine and non-chlorine organic contaminated soil

Formation and emission of dioxins is a great concern during thermal desorption remediation of organic contaminated soil. The differential formation of dioxins from chlorine organic contaminated soil (COCS) and non-chlorine organic contaminated soil (NCOCS) is still unclear and the control technique for the dioxins generated is an urgent need. In this study, the formation and distribution characteristics of dioxins were investigated in the thermal desorption unit combined with flue gas purification system during COCS and NCOCS treatments. Although organic contaminates were well desorbed, de-novo formation of dioxins was observed for both COCS and NCOCS, as well as synthesis from precursors for NCOCS. The gas-phase dioxin in the flue gas purification system continuously decreased during NCOCS thermal desorption, while the dioxin concentration in the quench tower sharply increased from 0.46 to 2.13 ng/Nm3 through de-novo synthesis during COCS treatment. Furthermore, the emission of dioxins only slightly reduced (for COCS) or even increased (for NCOCS) at 70% operating load. The catalytic adsorption tower within modified activated carbon and V5-Mo5-Ti catalyst after bag filter can reduce the emission of dioxins up to 91.4% at the condition of secondary combustion chamber closure, demonstrating that the catalytic adsorption tower can replace the secondary combustion chamber for controlling dioxin emission. More importantly, the highly toxic low-chlorinated polychlorinated dibenzodioxins and polychlorinated dibenzofurans (PCDD/PCDFs) were selectively removed from flue gas by the catalytic adsorption tower. These results reveal the differential formation characteristics of dioxins during COCS and NCOCS thermal treatments and highlight V5-Mo5-Ti/ modified activated carbon as a promising catalytic adsorption material to control the emission of dioxins from the thermal desorption of organic contaminated soil.

Microbial | electrochemical CO2 reduction: To integrate or not to integrate?

Microbial | electrochemical CO2 reduction: To integrate or not to integrate?

Fate and emission behavior of heavy metals during hazardous chemical waste incineration

The fate and emission behavior of heavy metals (As, Cd, Co, Cr, Cu, Ni, Pb, Se, and Zn) from a hazardous chemical waste incinerator were systematically explored. The results show that the main components of incineration fly ashes and slags contain minerals such as salt, plagioclase, pyroxene, gypsum, calcite, and slaked lime. The elements As, Cd, Pb, and Se are enriched in the fly ash particles during flue gas condensation. Co and Ni are more likely to be deposited in the rotary kiln slag and cooling tower slag owing to their lower volatility. Zn, Cr, and Cu are usually volatilized into the flue gas as oxides or chlorides are condensed and enriched in the slag of the cooling tower during the flue gas cooling process. The content of As, Cd, Pb, Ni, Cr, and Se increase with decreasing fly ash particle size. After the flue gas purification equipment was employed, the concentration of particulate metals significantly reduced. In the exhaust flue gas, the concentrations of Cu and Zn are 29.85 and 28.47 μg/m3, those of As, Cr, Ni, Pb, and Se range from 2.54 to 9.25 μg/m3, and those of Co and Cd are 0.42 and 0.13 μg/m3, respectively.

Evaluation of visible photocatalytic performance of microwave hydrothermal synthesis of MnO2/TiO2 core-shell structures and gaseous mercury removal

MnO 2 /TiO 2 core-shell structure photocatalyst was prepared by a two-step microwave method. Under visible light irradiation, this core-shell photocatalyst exhibited enhanced catalytic activity for the degradation of organic dye Rhodamine B and the oxidative removal of gaseous heavy metal Hg 0 . The MnO 2 shell not only enhanced the visible light absorption of TiO 2 , but also increased its specific surface area to 227.94 m 2 g −1 . In addition, the formation of core-shell heterojunction promotes the migration of carriers and the separation of photo-generated electron-hole pairs, and improves the stability of the composite, thus enabling it to exhibit enhanced photocatalytic performance. • MnO 2 /TiO 2 core-shell structure photocatalysts were prepared by a two-step microwave method. • MnO 2 /TiO 2 core-shell structure improves visible light absorption capacity, specific surface area and carrier separation. • MnO 2 /TiO 2 core-shell structure catalysts show photocatalytic activity to Hg 0 and RhB under visible light. This study provides an effective idea for the rapid preparation of high-efficiency core-shell photocatalysts, and is expected to contribute to the treatment of organic pollution in water and purification of metallurgical flue gas.

Ten-year emission characteristics of atmospheric pollutants from incineration of sacrificial offerings in China

The incineration of sacrificial offerings is a significant widely practiced custom that is also a kind of neglected air pollution source in China. Our results showed that the emission factors of particulate matter, SO2, CO, NOx, and VOCs emitted from the incineration of sacrificial offerings with purification systems were reduced by 95%, 19%, 9%, 82%, and 42%, respectively, compared with those without a purification system, revealing a significant effect of the flue gas purification system on reducing particulate matter and gaseous pollutants. The emission level of air pollutants from the incineration of sacrificial offerings remained stable before 2013 and then showed a remarkable decrease after the implementation of China´s Air Pollution Prevention Action Plan in 2013. The emissions of TSP (total suspended particulate), PM10, PM2.5, and NOx in 2009 were 8222, 6106, 5656 and 15,878 ton, respectively, obviously higher than 3434, 2551, 2305 and 8579 ton in 2019. Such trend was affected by both the quantity of incineration and the installation rate of purification systems after the Emission Standard of Air Pollutants for Crematory (GB 13801-2015) issued in China. Distinct spatial distribution of atmospheric pollutants from incineration of sacrificial offerings was found with higher in the east and south of China than the west and north of China, which is proportional to the regional economy and population. The maximum ground-level concentration typically occurred at 0.12-0.2 km from the pollution source, posing potential health risks to people entering and exiting funeral and burial sites and nearby residents.