scholarly journals PECULIARITIES OF ABSORPTION OF SULFUR DIOXIDE AND NITROGEN OXIDE IN SUSPENSIONS AND SOLUTIONS OF MANGANESE COMPOUNDS

2020 ◽  
pp. 49-56
Author(s):  
I.A. Volchyn ◽  
S.V. Mezin ◽  
A.O. Yasinetsky
Keyword(s):  
Sulfur Dioxide ◽  
Manganese Oxide ◽  
Nitrogen Oxide ◽  
Experimental Studies ◽  
Bubble Surface ◽  
Molar Ratio ◽  
Manganese Sulfate ◽  
Desulfurization Process ◽  
Reduce Emissions ◽  
Manganese Compounds

It is proposed to use manganese compounds to reduce emissions of sulfur and nitrogen oxides, large deposits of which are in Ukraine. The results of experimental studies of the binding of sulfur dioxide and potassium permanganate of nitric oxide in water by manganese oxide are presented. In the experiments, the model gas in the form of small bubbles was passed through the reactor with liquid. Heat and mass transfer processes between the gas and liquid phases occurred on the bubble surface. The gas-liquid contact time is the bubble rise time. The absorption reactions take place in the liquid phase. Complete absorption of sulfur dioxide takes place in an acidic environment, provided that the molar ratio MnO2 / SO2 is not less than 2. The reaction product is manganese sulfate, which is a useful product. The maximum absorption of nitrogen oxide is achieved at a molar ratio of KMnO4 / NO not less than 5. The reaction forms a precipitate of manganese oxide, which can later be used in the desulfurization process. Bibl. 12, fig. 6, tab. 3.

scholarly journals DETERMINATION OF OPTIMAL CONDITIONS FOR EFFECTIVE ABSORPTION OF NITROGEN AND SULFUR OXIDES BY IRON-MANGANESE CONCRETIONS

2019 ◽  
Vol 62 (11) ◽  
pp. 150-155
Author(s):  
Oleg M. Flisyuk ◽  
Dar'ya A. Novikova ◽  
Sergey A. Panasenko ◽  
Nikolay A. Martsulevich
Keyword(s):  
Nitrogen Oxide ◽  
Experimental Studies ◽  
Sorption Process ◽  
Absorption Characteristic ◽  
Manganese Sulfate ◽  
Sulfur Oxide ◽  
Optimal Conditions ◽  
Industrial Emissions ◽  
Iron Manganese

Iron-manganese concretions (IMC) absorption characteristic and composition of the material was studied. The active component in it is manganese (IV) oxide MnO2. A method is proposed for using a suspension of iron-manganese concretions ore to capture industrial emissions: nitrogen oxide (II) NO and sulfur oxide (IV) SO2. This method involves the reaction of the absorption of nitrogen oxide (II) NO by manganese (IV) oxide MnO2 in the presence of nitric acid HNO3. The formation of manganese nitrate Mn(NO3)2 occurs. Also, the reaction of the absorption of sulfur oxide (IV) SO2 by manganese (IV) oxide MnO2 with the formation of manganese sulfate MnSO4 takes place. Special installations for research and development of the process of sorption were developed. The results of experimental studies of the sorption process of nitrogen oxide (II) NO and sulfur oxide (IV) SO2 by a suspension based on IMC are presented. The main parameters of the influence on the process of the system operation are indicated: time for reaching a constant mode, temperature of the working suspension, method of mixing. Tables and figures are given showing the experimental results of the processes with various factors of influence. Optimal conditions for maximum efficient conduction of nitrogen oxide and sulfur dioxide absorption process were determined for adsorption of these gases to 85% and 99%, respectively, from the model mixtures that corresponds to the waste gases. Comparative analysis of sorption processes of NO and SO2 was performed.

Utilization of the By-Products for Simultaneous Purification of Sulfur Dioxide and Nitrogen Oxide in Bio-Trickling Process

2013 ◽  
Vol 779-780 ◽  
pp. 1220-1223
Author(s):  
Wen Bo Zhou ◽  
Ping Zou ◽  
Pei Shi Sun ◽  
Xiao Yi Bi ◽  
Yong Yang Mao ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Nitrogen Oxide ◽  
Ammonium Nitrate ◽  
Ammonium Sulfate ◽  
Purification Process ◽  
Copper Ore ◽  
By Products

The potential of using the waste from simultaneous NOx and SO2 purification bio-trickling process to leach copper ore and to make fertilizer was investigated. It was found there were two main exhausted by-products in the purification process: the acidic liquid in desulfurization tower and the alkalescent liquid in denitrogenation tower. Through operation of leaching the oxide ore sample containing 2.58% copper by the acidic liquid, the effective grade of the metal to be extracted reached 28.37% by weight. With adding proportional dose of ammonia into the alkalescent liquid or the acidic liquid and going through evaporation and concentration, crystal products of ammonium sulfate and ammonium nitrate were generated, which can be used in fertilizer manufacturing.

Development of Straw Briquette Boiler

2012 ◽  
Vol 608-609 ◽  
pp. 339-343
Author(s):  
Peng Ma ◽  
Hui Li Liu ◽  
Sheng Yong Liu
Keyword(s):  
Sulfur Dioxide ◽  
Nitrogen Oxide ◽  
Combustion Efficiency ◽  
National Standard ◽  
Processing Methods ◽  
Standard Requirement ◽  
Incomplete Combustion ◽  
Combustion Loss

According to the specialty of straw briquette combustion, thermodynamic calculating and special processing methods, the special boiler which applies to cornstalk briquettes is designed and made. It has double fire grates which have function of smoke removing. Moreover, the combustion efficiency of this boiler is higher and the incomplete combustion loss of solid and gas is less. The contents of fume, nitrogen oxide and sulfur dioxide in the vent smoke are low enough to accords with national standard requirement. So it will have a splendid future to use straw as the substitute of coal in our country.

Theoretical and Experimental Studies of Sulfur and Boron Distribution between the Slag of the CaO-SiO2-B2O3-MgO-Al2O3 System and the Metal

2021 ◽  
Vol 410 ◽  
pp. 287-292
Author(s):  
Anatolij A. Babenko ◽  
Leonid A. Smirnov ◽  
Alena G. Upolovnikova
Keyword(s):  
Distribution Coefficient ◽  
Thermodynamic Modeling ◽  
Experimental Studies ◽  
Oxide System ◽  
Slag Basicity ◽  
Interphase Distribution ◽  
Desulfurization Process ◽  
Simplex Lattice ◽  
High Degree ◽  
Effect Of The Composition

The equilibrium interfacial distribution of sulfur and boron was estimated using the HSC 6.1 Chemistry software package (Outokumpu) and the simplex-lattice planning method. Adequate mathematical models have been constructed in the form of III degree polynomial, which describe the effect of the composition of the studied oxide system on the equilibrium distribution of sulfur and boron between the slag and the metal. Generalization of the results of experimental studies and thermodynamic modeling made it possible to obtain new data on the influence of the basicity and content of B2O3 in the slag of the CaO-SiO2-B2O3-MgO-Al2O3 system on the interphase distribution of sulfur and boron. It was found that in the range of boron oxide concentration of 1.0-10%, an increase in slag basicity from 2 to 5 at 1600°C leads to an increase in the sulfur distribution coefficient from 1 to 20 and, as a consequence, a decrease in the sulfur content in the metal from 0.02 to 0.0014 %, i.e. an increase in slag basicity favorably affects the development of the metal desulfurization process. An increase in the B2O3 content from 2.0 to 10.0% in slags formed in the region of moderate basicity, not exceeding 2-3, is accompanied at 1600°C by a decrease in the boron interphase distribution coefficient from 450 to 150 and an increase in the boron concentration in the metal from 0.006 to 0.021 %, which indicates the progress of boron reduction from slag to metal. The shift of the formed slags to the area of ​​increased basicity up to 5.0 shows a high degree of boron reduction from slag to metal. The results of the laboratory experiment confirmed the results of thermodynamic modeling.

scholarly journals COMBUSTION PERFORMANCE OF SYNGAS FROM BIOMASS WASTE IN GAS BURNER SYSTEM/PRESTASI PEMBAKARAN SYNGAS DARI SISA BIOJISIM DALAM SISTEM PEMBAKAR GAS

2018 ◽  
Vol 80 (5) ◽  
Author(s):  
Mohd Oryza Mohd Mokhtar ◽  
Mohammad Nazri Mohd Ja’afar ◽  
Mustafa Yusoff ◽  
Mazlan Said ◽  
Muhammad Roslan Rahim ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Sulfur Dioxide ◽  
Nitrogen Oxide ◽  
Combustion Temperature ◽  
Fossil Fuel ◽  
Biomass Waste ◽  
Gas Combustion ◽  
Combustion Performance ◽  
Positive Effects ◽  
Gas Burner

Syngas from biomass residues is an alternative fuel to address the ever-increasing fossil fuel supply problem and the issue of releasing toxic gases from the fossil fuel burning process. Syngas is also a renewable fuel and features environmentally friendly fuel. This study was conducted to investigate the performance of the syngas produced from oil palm shells (PKS) using fluidized bed gasifier. In this study, the produced syngas was tested for its combustion performance from the aspect of gas combustion temperature and resulting emission concentrations such as nitrogen oxide (NOx), carbon monoxide (CO) and sulfur dioxide (SO2). The resulting syngas was studied at different ratio of air velocities to fuels. From the test, the ratio of velocity of air to fuel affects the gas combustion temperature and emission emission concentration. By increasing the air velocity to fuel ratio during the gasification process produces more positive effects primarily in improving the temperature of the gas burner combustion and reducing carbon monoxide (CO) emissions. However, the concentration of sulfur dioxide release (SO2) and nitrogen oxide (NOx) increase.

scholarly journals The Effect of Air Pollution on the Immune System

2020 ◽  
Vol 4 (4) ◽  
Author(s):  
Diana Liu
Keyword(s):  
Cardiovascular Disease ◽  
Air Pollution ◽  
Innate Immunity ◽  
Particulate Matter ◽  
Immune System ◽  
Sulfur Dioxide ◽  
Nitrogen Oxide ◽  
Immune Cells ◽  
Cytokine Secretion ◽  
Acquired Immunity

Air pollution has become a serious problem, the pollutant mainly came from industrial and vehicle exhaustion will harm people’s bodies to a different extent, cause lots of diseases like asthma, and cardiovascular disease. The system protects us are also be damaged by pollutant entering the tissue barrier, harm to immune cells and regulate cytokine secretion. This essay is mainly focused on the particulate matter, sulfur dioxide, and nitrogen oxide effect on the immune system from the innate immunity to the acquired immunity, and how the immune system defense.

scholarly journals EXPERIENCE OF THE DEVELOPMENT OF BURNERS, CHAMBERS, AND TECHNOLOGIES FOR REDUCING EMISSIONS OF NITROGEN OXIDES BY BOILERS DURING THE COMBUSTION OF NATURAL GAS

2019 ◽  
pp. 70-79
Author(s):  
I.Ya. Sigal ◽  
A.V. Smikhula ◽  
O.I. Sigal
Keyword(s):  
Natural Gas ◽  
Nitrogen Oxides ◽  
Nitrogen Oxide ◽  
National Academy Of Sciences ◽  
Nitrogen Oxide Emissions ◽  
Two Stage ◽  
Immediate Reconstruction ◽  
Boiler Units ◽  
Reduce Emissions ◽  
The 1960S

In the article discusses the features of constructive solutions accepted in the burner devices and chambers of boiler units, which were used both when converting solid fuel boilers to natural gas, and creating new designs of gas boiler units. The works to reduce nitrogen oxide emissions at the Gas Institute of the National Academy of Sciences of Ukraine began in the 1960s and by 1971 significant results had been achieved was shown. The main methods and technical solutions that are used to reduce emissions of nitrogen oxides during the combustion of natural gas in boilers of various capacities, including 300 MW power units, are considered. The principal design of a two-stage burner, which are operated in an amount of more than 2000 units in Ukraine and the CIS countries is presented. The installed two-stage burner devices for combustion of natural gas require immediate reconstruction with bringing their indicators to the calculated ones at the first stage. The modernization of the exist ing two-stage burners is possible to achieve the readings of the EU emissions directive 2010/75/EU was shown. The most promising technologies for further reducing the level of nitrogen oxide emissions less than 100 mg/Nm3 (3% O2, dry gases) when burning natural gas were shown. Bibl. 38, Fig.4, Tab. 1.

Low-valence or tetravalent cation doping of manganese oxide octahedral molecular sieve (K-OMS-2) materials for nitrogen oxide emission abatement

2019 ◽  
Vol 9 (15) ◽  
pp. 4108-4117 ◽  
Author(s):  
Xiaomin Wu ◽  
Xiaolong Yu ◽  
Ziyi Chen ◽  
Zhiwei Huang ◽  
Guohua Jing
Keyword(s):  
Catalytic Activity ◽  
Oxygen Vacancy ◽  
Manganese Oxide ◽  
Nitrogen Oxide ◽  
Molecular Sieve ◽  
Oxide Catalysts ◽  
Nitrogen Oxide Emission ◽  
Vacancy Defects ◽  
Cation Doping ◽  
Tetravalent Cation

Substitutionally doped oxide catalysts with abundant oxygen vacancy defects (OVDs) can effectively improve the catalytic activity efficiency.

Curtailing the generation of sulfur dioxide and nitrogen oxide emissions by blending and oxy-combustion of coals

Fuel ◽  
2016 ◽  
Vol 181 ◽  
pp. 772-784 ◽  
Author(s):  
Emad Rokni ◽  
Aidin Panahi ◽  
Xiaohan Ren ◽  
Yiannis A. Levendis
Keyword(s):  
Sulfur Dioxide ◽  
Nitrogen Oxide ◽  
Nitrogen Oxide Emissions

scholarly journals Pilot-scale studies on NOx removal from flue gas via NO ozonation and absorption into NaOH solution

2012 ◽  
Vol 33 (3) ◽  
pp. 345-358 ◽  
Author(s):  
Maciej P. Jakubiak ◽  
Keyword(s):  
Flue Gas ◽  
Experimental Studies ◽  
Pilot Scale ◽  
No Oxidation ◽  
Molar Ratio ◽  
Nox Removal ◽  
Gas Channel ◽  
Wet Scrubbing ◽  
Naoh Solution ◽  
Gas Ratio

Abstract The paper presents results of experimental studies on removal of NOx from flue gas via NO ozonation and wet scrubbing of products of NO oxidation in NaOH solutions. The experiment was conducted in a pilot plant installation supplied with flue gas from a coal-fired boiler at the flow rate 200 m3/h. The initial mole fraction of NOx,ref in flue gas was approx. 220 ppm, the molar ratio X = O3/NOref varied between 0 and 2.5. Ozone (O3 content 1÷5% in oxygen) was injected into the flue gas channel before the wet scrubber. The effect of the mole ratio X, the NaOH concentration in the absorbent, the liquid-to-gas ratio (L/G) and the initial NOx concentration on the efficiency of NOx removal was examined. Two domains of the molar ratio X were distinguished in which denitrification was governed by different mechanisms: for X ≤ 1.0 oxidation of NO to NO2 predominates with slow absorption of NO2, for X >> 1.0 NO2 undergoes further oxidation to higher oxides being efficiently absorbed in the scrubber. At the stoichiometric conditions (X = 1) the effectiveness of NO oxidation was better than 90%. However, the effectiveness of NOx removal reached only 25%. When ozonation was intensified (X ≥ 2.25) about 95% of NOx was removed from flue gas. The concentration of sodium hydroxide in the aqueous solution and the liquid-to-gas ratio in the absorber had little effect on the effectiveness of NOx removal for X > 2.

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