Effect of Cordierite-Modified on SCR Commercial Catalyst

2014 ◽  
Vol 960-961 ◽  
pp. 176-181
Author(s):  
Wen Chang Xi ◽  
Qing Cai Liu ◽  
De Liang Niu ◽  
Jian Yang ◽  
Qiang Yang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Flue Gas ◽  
Catalytic Reduction ◽  
Rutile Phase ◽  
Gas Analyzer ◽  
Commercial Catalyst ◽  
Mixing Method ◽  
Higher Temperature ◽  
Solid Liquid ◽  
Flue Gas Denitrification

The V2O5-WO3/TiO2honeycomb catalysts with cordierite modified were prepared by solid-liquid mixing method. Its thermal stability, crystal structure, abrasion resistance and activity were studied by XRD, abrasion equipment and simulated flue gas analyzer,respectively. The results indicated that V2O5-WO3/Cordierite-TiO2honeycomb catalyst possessed a better thermal stability, mechanical property and activity at the higher temperature comparing to commercial catalyst. There was no rutile phase present after the catalysts were calcined at 700°C, and the vanadia and tungsten trioxide phases could be apparently visible on TiO2. Key word:V2O5-WO3/ TiO2; Cordierite; flue gas denitrification; NOx; selective catalytic reduction (SCR)

Utilization of Fly Ash Contaminated by SNCR Flue Gas Denitrification into Polymer Epoxy Anchor

2018 ◽  
Vol 776 ◽  
pp. 98-103
Author(s):  
Tomáš Žlebek ◽  
Jakub Hodul ◽  
Rostislav Drochytka
Keyword(s):  
Fly Ash ◽  
Flue Gas ◽  
Epoxy Resins ◽  
Catalytic Reduction ◽  
Physical And Mechanical Properties ◽  
Polymer Materials ◽  
Problematic Use ◽  
Different Types ◽  
Flue Gas Denitrification

The paper deals with the possibility of using two different types of fly ash contaminated by flue gas denitrification (Selective Non-Catalytic Reduction (SNCR)) as a filler into the polymer anchor based on epoxy resin. Due to the problematic use of contaminated fly ash in silicate materials, the use of such fly ash in polymer materials seems to be effective because by mixing with polymers such as polyester and epoxy resins, toxic gas ammonia (NH3) does not release. Determination of optimal percentage of filling by the fly ash was performed in order to achieve the best possible physical and mechanical properties of the epoxy anchor material. It was found out that the 45% addition of both used of contaminated fly ashes seems to be the most appropriate, when the polymer anchor material exhibited better tensile properties than reference anchors containing quartz sand Dorsilit. Furthermore, it was found that the optimal addition of contaminated fly ash also positively influenced the maximum anchoring force found in the tug test. Detailed connection of anchor material with anchored bar and concrete was observed on tomography images.

scholarly journals Ammonia in Fly Ashes from Flue Gas Denitrification Process and its Impact on the Properties of Cement Composites

Buildings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 225 ◽  
Author(s):  
Agnieszka Michalik ◽  
Joanna Babińska ◽  
Filip Chyliński ◽  
Artur Piekarczuk
Keyword(s):  
Fly Ash ◽  
Flue Gas ◽  
Coal Combustion ◽  
Catalytic Reduction ◽  
Structural Features ◽  
Cement Composites ◽  
Fly Ashes ◽  
Ammonia Content ◽  
Denitrification Process ◽  
Flue Gas Denitrification

The paper presents the results of research on the properties of fly ashes from the process of flue gas denitrification by selective non-catalytic reduction (SNCR), consisting of dosing urea into the coal combustion chamber. The research was carried out on two types of fly ash: Silica fly ash from flue gas denitrification and ash from a traditional boiler without the flue gas denitrification process. The scope of comparative studies included physicochemical and structural features of ashes, as well as slurries and mortars with the addition of ashes. Fly ash from denitrification, whose ammonia content at the time of sampling was 75 mg/kg at the maximum, was examined. Our own research has shown that fly ash from flue gas denitrification is characterized by a higher value of losses on ignition and ammonia content in comparison to ashes without denitrification. It was shown that the ammonia content in the analyzed range does not limit the use of fly ash as an additive to cement and concrete.

The Discharge Status and Technical Analysis of NOX of Thermal Power Plant Boiler

2014 ◽  
Vol 535 ◽  
pp. 131-134 ◽  
Author(s):  
Dong Yang ◽  
Qing Wen Chen
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Thermal Power Plant ◽  
Catalytic Reduction ◽  
Thermal Power ◽  
Combustion Technology ◽  
Discharge Status ◽  
Low Nox Combustion ◽  
Plant Boiler ◽  
Flue Gas Denitrification

NOXis one of the pollutants which will be key governanced by Government in Twelfth Five, and thermal power plant boiler is the main source of NOXin the atmospheric. Overview of the discharge status of NOXand the state-controlled status of the power plant NOXdischarge regulations with the latest standards, analysis of the current two thermal power plant NOXcontrol technology: low-NOx combustion technology and flue gas denitrification technology. Low NOx combustion technology introduces low excess air combustion technology, air staged combustion technology, flue gas recirculation technology, flue gas denitrification technology introduced four methods which is selective catalytic reduction, selective non-catalytic reduction, hybrid SNCR-SCR catalyst reduction combined metgod and wet NOXabsorption system, principle of denitration and their advantages and disadvantages of different methods are discussed. Finally a brief introduction of the difficulties of governance NOXand some necessary issues when select zhe control methods.

Comparison and Analysis on Flue Gas Denitrification Technology in Coal Fired Boiler Retrofit

2013 ◽  
Vol 781-784 ◽  
pp. 2497-2501 ◽  
Author(s):  
Qian Zhang ◽  
Rui Ma ◽  
You Ning Xu ◽  
Jun Rui Shi ◽  
Feng Yi Guan
Keyword(s):  
Selective Catalytic Reduction ◽  
Flue Gas ◽  
Catalytic Reduction ◽  
Comparison And Analysis ◽  
Transformation Methods ◽  
Flue Gas Denitrification

The widely used technologies of Selective Catalytic Reduction (SCR), Non-selective Catalytic Reduction (SNCR) and hybrid SNCR-SCR for coal-fired boiler in China are reviewed. The technical characteristics of different processes and transformation methods are compared. Analysis is made about the advantages of each technology and the major problems in the retrofitting. The proposal for the corresponding problems is presented. Reference is provided for coal-fired boiler denitrification transformation in China.

Environmental Study of the Design and Operation of the SCR Flue Gas Denitration Project

2014 ◽  
Vol 977 ◽  
pp. 285-289 ◽  
Author(s):  
Yan Kun Cheng ◽  
Li Xuan Wang ◽  
Peng Huo
Keyword(s):  
Selective Catalytic Reduction ◽  
Flue Gas ◽  
Catalytic Reduction ◽  
Environmental Study ◽  
Technology Application ◽  
Secondary Pollution ◽  
Flue Gas Denitrification

Describes the principle and process of application of (Selective catalytic reduction) SCR flue gas denitration technology application and process, boiler flue gas generated NOx and NH3reduction in the role of a catalyst, generating no secondary pollution N2 and H2O, this paper layout and operation of the equipment on the SCR reactor, and the effect of flue gas denitrification were discussed deeply。

scholarly journals Hybrid technology of reduction of nitrogen oxides (NOx) in exhaust gases; Part 2 – Numerical model of pilot scale regenerative rotary air heater (RAH) retrofited with selective catalyst reduction (SCR) modules

2019 ◽  
Vol 82 ◽  
pp. 01016 ◽  
Author(s):  
Andrzej Kwiczala ◽  
Robert Wejkowski
Keyword(s):  
Numerical Model ◽  
Flue Gas ◽  
Catalytic Reduction ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Gas Temperature ◽  
Air Heater ◽  
Exhaust Gas Temperature ◽  
Heat Exchange Efficiency ◽  
Flue Gas Denitrification

This article exhibits the results of the analysis performed to verify the effectiveness of the hybrid flue gas denitrification system (herein referred to as HDS) which involved the retrofitting for selective catalytic reduction (SCR) material into a regenerative rotary air heater (RAH). A numerical model corresponding to the actual pilot scale RAH operating conditions was developed. The ultimate intent of the numerical model is to provide a platform where the technology can be implemented on full scale air preheaters. The numerical analysis performed on the pilot scale HDS installation showed a 3% decrease in heat exchange efficiency in the exchanger. This decrease was significantly minimized by the use of blades adjusting the distribution of flue gases entering the RAH. This means that the exhaust gas temperature at the exchanger outlet increased by 4°C, which corresponds to an average of 0.3% increase in the boiler outlet loss. It was also recognized that the air temperature was reduced by 8°C, which does not translate into significant changes in boiler performance parameters. other boiler operating parameters in a noticeable way during operation.

scholarly journals Numerical Analysis on the Flue Gas Temperature Maintenance System of a Solid Fuel-Fired Boiler Operating at Minimum Loads

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4420
Author(s):  
Michalina Kurkus-Gruszecka ◽  
Piotr Krawczyk ◽  
Janusz Lewandowski
Keyword(s):  
Flue Gas ◽  
Catalytic Reduction ◽  
Gas Temperature ◽  
Gas Streams ◽  
Different Temperatures ◽  
Flap Design ◽  
Lower Load ◽  
Higher Temperature ◽  
High Level ◽  
Exhaust Gas Temperature

Currently, energy policy is associated with the increase in the share of renewable sources in systemic energy production. Due to this trend, coal-fired power units must increase their work flexibility. Adapting a coal power plant to work with a lower load often causes the issue of maintaining the temperature before the selective catalytic reduction (SCR) installation at a sufficiently high level. This paper presents a CFD analysis of the mixing area of two flue gas streams before the SCR installation with various methods for mixing flue gas streams. The novelty of the work is mixing the flue gas streams of different temperatures using a flap shape developed by the authors. A series of numerical simulations were performed to develop the location and method of introducing the higher temperature gas, obtaining a uniform distribution of the exhaust gas temperature. The simulation scheme was applied to a series of geometrical modifications of the boundary conditions. The tested solution using only a single, straight flap in the flue gas duct allows the amplitude to be reduced from 298 K to 144 K. As a result of the research, a mixing flap design was developed to reduce the initial temperature amplitude of the flue gas streams from 298 K to 43 K.

scholarly journals Synthesis and photocatalytic properties of Sn–TiO2 nanomaterials

2020 ◽  
Vol 10 (01n02) ◽  
pp. 2060018
Author(s):  
E. M. Bayan ◽  
T. G. Lupeiko ◽  
L. E. Pustovaya ◽  
M. G. Volkova
Keyword(s):  
Phase Transition ◽  
Thermal Stability ◽  
Sol Gel ◽  
Rutile Phase ◽  
Photocatalytic Properties ◽  
Light Activation ◽  
X Ray ◽  
Tio2 Nanomaterials ◽  
Visible Light Activation ◽  
Thermal Stability Of

Sn-doped TiO2 nanomaterials were synthesized by sol–gel method. It was shown the phase compositions and phase transitions change with the introduction of different tin amounts (0.5–20[Formula: see text]mol.%). X-ray powder diffraction was used to study the effect of different tin amounts on the anatase–rutile phase transition. It was found that the introduction of ions increases the thermal stability of anatase modifications. The material’s photocatalytic activity was studied in reaction with a model pollutant (methylene blue) photodegradation under UV and visible light activation. The best photocatalytic properties were shown for material, which contains 5[Formula: see text]mol.% of Sn.

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