The Study on Thermal Stability of Hg and S Element in Semi-Dry Flue Gas Desulfurization Ash

2015 ◽  
Vol 768 ◽  
pp. 434-440
Author(s):  
Yu Shen ◽  
Li Sha Yang ◽  
Chao Jie Li ◽  
Chuan Min Chen ◽  
Song Tao Liu
Keyword(s):  
Thermal Stability ◽  
Flue Gas ◽  
Raw Materials ◽  
Flue Gas Desulfurization ◽  
Environment Pollution ◽  
Crystal Water ◽  
Comprehensive Utilization ◽  
Calcium Sulfite ◽  
Research Achievement ◽  
Thermal Stability Of

The semi-dry flue gas desulfurization technology is widely used by coal-fired power plant. Desulfurization ash produced by semi-dry flue gas desulfurization, which consist CaSO3, CaCO3, Ca (OH) 2, CaSO4 and so on. It will bring new environment pollution if not been disposed properly. Building material industry is the main field in terms of the comprehensive utilization of desulfurization ash. While hazardous elements especial S and Hg may be released in the condition of temperature changes in the process of desulfurization ash utilization, causing second environment pollution. Combined with the research achievement of preparing autoclaved brick before, the content of S and Hg in raw materials and autoclaved brick were studied during the thermal utilization process in this article. The thermal stability of calcium sulfite was analyzed by the chemical reagent calcium sulfite. The results shown that calcium sulfite only lost crystal water whether in oxygen or air when the temperature is below 450°C, calcium sulfite was completely oxidized to calcium sulfate when the temperature is 475 °C in oxygen or 515°C in air. The contents of S and Hg which existed in desulfurization ash were 7.03%wt and 460μg/kg, respectively. The contents of S and Hg in autoclaved brick which made by desulfurization ash mainly were 5.16%wt and 450μg/kg, respectively. The results shown that the content of elements S and Hg in raw materials and autoclaved brick were roughly the same, which indicated that S and Hg no escape in the process of preparing autoclaved brick. The research provided a certain references for the comprehensive utilization of semi-dry flue gas desulfurization ash in the condition of heat and humid.

scholarly journals Fire Suppression and Thermal Behavior of Biobased Rigid Polyurethane Foam Filled with Biomass Incineration Waste Ash

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 683 ◽  
Author(s):  
Agnė Kairytė ◽  
Arūnas Kremensas ◽  
Saulius Vaitkus ◽  
Sylwia Członka ◽  
Anna Strąkowska
Keyword(s):  
Thermal Stability ◽  
Building Materials ◽  
Raw Materials ◽  
Fire Suppression ◽  
Waste Incineration ◽  
Supply Chain System ◽  
Smoke Suppressant ◽  
Foam Filled ◽  
Pu Foams ◽  
Thermal Stability Of

Currently, there is great demand to implement circular economy principles and motivate producers of building materials to integrate into a closed loop supply chain system and improve sustainability of their end-product. Therefore, it is of great interest to replace conventional raw materials with inorganic or organic waste-based and filler-type additives to promote sustainability and the close loop chain. This article investigates the possibility of bottom waste incineration ash (WA) particles to be used as a flame retardant replacement to increase fire safety and thermal stability under higher temperatures. From 10 wt.% to 50 wt.% WA particles do not significantly deteriorate performance characteristics, such as compressive strength, thermal conductivity, and water absorption after 28 days of immersion, and at 32 °C WA particles improve the thermal stability of resultant PU foams. Furthermore, 50 wt.% WA particles reduce average heat release by 69% and CO2 and CO yields during fire by 76% and 77%, respectively. Unfortunately, WA particles do not act as a smoke suppressant and do not reduce smoke release rate.

Study on Oxidation of Calcium Sulfite in Dual Alkali Flue Gas Desulfurization System

2012 ◽  
Vol 13 (1) ◽  
pp. 257-262 ◽  
Author(s):  
K. G. Mbango Mbida ◽  
Song Cun Yi ◽  
Chang Guan Qin ◽  
Zhang Lidong
Keyword(s):  
Flue Gas ◽  
Flue Gas Desulfurization ◽  
Calcium Sulfite

Crystallization Characteristics and Thermal Stability of Fluor-Hydroxyapatite Composites with Zirconia

2012 ◽  
Vol 182-183 ◽  
pp. 122-125
Author(s):  
Li Li Wang ◽  
Xiu Feng Wang ◽  
Cheng Long Yu ◽  
Hong Tao Jiang
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Solid State ◽  
Low Temperature ◽  
Solid Solutions ◽  
Tricalcium Phosphate ◽  
Solid State Reaction ◽  
Calcium Fluoride ◽  
Raw Materials ◽  
Thermal Stability Of

Hydroxyapatite (HA) was synthesized in presence of 20wt% m-ZrO2by solid state reaction between tricalcium phosphate(TCP) and Ca(OH)2at 1000 °C for 2h. Similarily, Fluorine hydroxyapatite(FA) was synthesized using tricalcium phosphate and calcium fluoride as raw materials at 1000 °Cfor 3h. The as-prepared HA was mixed with 10%,25%,45%,55%,70wt% FA and the mixture was sintered at 1000°C-1400°C for 2h. The main phase and bulk density was measured. The results show that when the relative amount of FA to HA increased, the decomposition of the composite is decreased gradually because of the formation of thermally stable FHA solid solutions. Low temperature would effect the exchange of ionic between FA and HA,while high temperature would impact synthesis of composites, because high temperature would lead to dissolution of HA ,which has to react with FA. Increase the content of HA would be advantage for synthesis FHA-ZrO2composite.

scholarly journals Study of oxidation of calcium sulfite in flue gas desulfurization by pore-type surface dielectric barrier discharge

RSC Advances ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 4464-4471
Author(s):  
He Guo ◽  
Nan Jiang ◽  
Jie Li ◽  
Xianjun Zhao ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Dielectric Barrier Discharge ◽  
Flue Gas ◽  
Barrier Discharge ◽  
Flue Gas Desulfurization ◽  
Dielectric Barrier ◽  
Surface Dielectric Barrier Discharge ◽  
Calcium Sulfite

Novelty: a new pore-type surface dielectric barrier discharge (PSDBD) reactor was first applied in the oxidation of calcium sulfite in flue gas desulfurization.

Influence of Soil pH and Application Rate on the Oxidation of Calcium Sulfite Derived from Flue Gas Desulfurization

2007 ◽  
Vol 36 (1) ◽  
pp. 298-304 ◽  
Author(s):  
Y. B. Lee ◽  
J. M. Bigham ◽  
W. A. Dick ◽  
F. S. Jones ◽  
C. Ramsier
Keyword(s):  
Soil Ph ◽  
Flue Gas ◽  
Application Rate ◽  
Flue Gas Desulfurization ◽  
Calcium Sulfite

Study on a New Technology of Flue Gas Desulfurization in Sintering Process

2013 ◽  
Vol 726-731 ◽  
pp. 2284-2290 ◽  
Author(s):  
Su Ping Wang ◽  
Xue Gong Bi ◽  
De Ming Weng
Keyword(s):  
Flue Gas ◽  
Raw Materials ◽  
New Technology ◽  
Sulfur Removal ◽  
Solid Particles ◽  
Flue Gas Desulfurization ◽  
Sintering Process ◽  
New Approach ◽  
Study Results ◽  
Operation Cost

In this paper, a new technology of sintering flue gas desulfurization is proposed. The principle is that some kind of additives is introduced into feed mix, the additives decompose into NH3in sintering process during heating, the NH3reacts with SO2gas to form ammonium sulphate solid particles, the particles are captured as dust by ESP, so the removal of SO2in sintering flue gas is achieved. The study results show that the concentration of SO2in sintering flue gas decreases gradually with the increase of additive amount, when the specific quantity of additive is 3.02kg per ton mix, the decreasing rate of SO2is up to 81.33%(mass). Since sintering dust must be recycled as raw materials, in order to solve the problem of flue gas SO2concentration is gradually increasing, the approach of increasing the amount of additive can be taken, or the dust is separately treated for sulfur removal before being used as raw sintering material. The new approach of reducing SO2emission in sintering flue gas has advantages of low investment, small occupation area and low operation cost. Moreover, the additive is inexpensive and readily available, so sintering cost is not increased obviously.

scholarly journals Thermal Behavior of Insulation Fiberboards Made from MDF and Paper Wastes

2021 ◽  
Vol 72 (3) ◽  
pp. 245-254
Author(s):  
Bita Moezzipour ◽  
Aida Moezzipour
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Thermal Analysis ◽  
Fire Resistance ◽  
Dimensional Stability ◽  
Raw Materials ◽  
Waste Paper ◽  
Recycled Fibers ◽  
Thermal Stability Of

Today, recycling is becoming increasingly important. In recycling process, the product performance should also be considered. In this study, manufacturing insulation fiberboard, as a practical wood product from recycled fibers, was investigated. For this purpose, two types of waste (MDF wastes and waste paper) were recycled to fibers and used for producing insulation fiberboards. The target fiberboard density was 0.3 g/cm3. The ratio of waste paper to MDF waste recycled fibers (WP/RF) was considered at two levels of 70/30 and 50/50. Polyvinyl acetate adhesive was used as a variable in the board manufacturing process. The mechanical properties, dimensional stability, thermal conductivity, and fire resistance of the boards were evaluated. Besides, the thermal stability of fiberboards was studied using thermal analysis including thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results showed that the insulation fiberboards had admissible mechanical properties and dimensional stability. The manufactured boards displayed low thermal conductivity, which proved to be well competitive with other insulation materials. The fiberboards manufactured with PVAc adhesive and WP/RF ratio of 50/50 had higher fire resistance compared to other treatments. Additionally, results of thermal analysis showed that the use of PVAc adhesive and WP/RF ratio of 50/50 leads to improved thermal stability. Overall, the recycled fibers from MDF and paper wastes appear to be appropriate raw materials for manufacturing thermal insulation panels, and use of PVAc adhesive can significantly improve thermal and practical properties of insulation fiberboards.

The Study on the Performance of Wet Limestone-Gypsum Flue Gas Mercury Removal Additive

2013 ◽  
Vol 448-453 ◽  
pp. 608-612
Author(s):  
Li Bao Yin ◽  
Qi Sheng Xu ◽  
Jiang Jun Hu ◽  
Yang Heng Xiong ◽  
Si Wei Chen
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Total Mercury ◽  
Elemental Mercury ◽  
Flue Gas Desulfurization ◽  
Mercury Removal ◽  
Additive Increase ◽  
Calcium Sulfite

The influences on the performance of wet flue gas desulfurization system in mercury removing after adding mercury removal additive were studied. As a consequence, the mercury removal efficiency can be improved by this kind of additive, that the efficiency of elemental mercury and total mercury is raised along with the amount of additive is increased. And so can the desulfuration efficiency. The oxidation of calcium sulfite in desulfurization is promoted by the mercury removal additive, increase the reduce speed of calcium sulfite concentration.

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