scholarly journals Influence of Oxidizing Reactor on Flue Gas Denitrification by Ozonation and Possibility of by-Product Separation

2017 ◽  
Vol 38 (1) ◽  
pp. 177-191
Author(s):  
Włodzimierz Kordylewski ◽  
Adam Hałat ◽  
Dariusz Łuszkiewicz
Keyword(s):  
Flue Gas ◽  
Pilot Scale ◽  
Product Separation ◽  
Naoh Solution ◽  
Preliminary Separation ◽  
Nox Removal Efficiency ◽  
Oxidation Reactor ◽  
By Products ◽  
Flue Gas Denitrification

Abstract Results of laboratory scale research have been presented on the effects of an oxidizing reactor on ozone consumption and by-producs composition and separation of simultaneous NOx and SO2 removal from a carrier gas by ozonation method and absorption in an alkaline solution. The additional Dreschel washer added before two washers containing 100 ml of 0.1 molar NaOH solution played the role of an oxidation reactor. Its effect was investigated using an empty (dry or wetted) or filled with packing elements washer. The measured by-products in a scrubber and in the oxidizing reactor were SO32-, SO42-, NO2- and NO3- ions, respectively. It has been shown that use of oxidizing reactor improves NOx removal efficiency reducing ozone consumption. Wetting of the oxidation reactor with water enables a preliminary separation of sulphur and nitrogen species between the oxidizing reactor and an alkaline absorber. Application of packing elements in the oxidizing reactor allows to retain 90% of nitrogen compounds in it. Some results were confirmed by tests in pilot scale.

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.

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.

Understanding the Role of Chlorine and Ozone to Control Postharvest Diseases in Fruit and Vegetables: A Review

2020 ◽  
Vol 16 (4) ◽  
pp. 455-461
Author(s):  
Gabriela M. Baia ◽  
Otniel Freitas-Silva ◽  
Murillo F. Junior
Keyword(s):  
Chlorine Dioxide ◽  
Broad Spectrum ◽  
Fruits And Vegetables ◽  
Low Cost ◽  
Residual Effects ◽  
Pathogenic Microorganisms ◽  
Postharvest Diseases ◽  
Post Harvest ◽  
By Products

Fruits and vegetables are foods that come into contact with various types of microorganisms from planting to their consumption. A lack or poor sanitation of these products after harvest can cause high losses due to deterioration and/ or pathogenic microorganisms. There are practically no post-harvest fungicides or bactericides with a broad spectrum of action that have no toxic residual effects and are safe. However, to minimize such problems, the use of sanitizers is an efficient device against these microorganisms. Chlorine is the most prevalent sanitizing agent because of its broad spectrum, low cost and well-established practices. However, the inevitable formation of disinfection by-products, such as trihalomethanes (THMs) and haloacetic acids (HAAs), is considered one of the main threats to food safety. Alternative sanitizers, such as chlorine dioxide (ClO2) and ozone, are becoming popular as a substitute for traditional post-harvest treatments. Thus, this review addresses the use of chlorine, chlorine dioxide and ozone emphasizing aspects, such as usage, safe application, spectrum of action and legislation. In order to ensure the quality and safety of final products, the adoption of well-prepared sanitation and sanitation programs for post-harvest fruits and vegetables is essential.

Tangxian Jidong Cement Co., Ltd. SNCR DeNOx Engineering Practice

2013 ◽  
Vol 726-731 ◽  
pp. 2342-2346 ◽  
Author(s):  
Shao Hua Ling ◽  
Chang Yong Jing ◽  
Jing Ma ◽  
Li Juan Zhang
Keyword(s):  
Flue Gas ◽  
Reducing Agent ◽  
Engineering Practice ◽  
System Configuration ◽  
Process Characteristics ◽  
Detailed Explanation ◽  
Actual Operating ◽  
Ammonia Slip ◽  
Flue Gas Denitrification

Tang xian in Hebei Jidong Cement Co., Ltd. flue gas denitrification treatment works, the project uses ammonia as a reducing agent SNCR DeNOx technology. A detailed explanation of the the SNCR process characteristics and system configuration, The analysis for actual operating results of the engineering. The results show: After treatment NOx concentration is less than 200 mg/Nm3, Denitrification efficiency reach 72.82%, Ammonia slip less than 0.9mg/Nm3, Engineering put into operation, About a year reduces emission NOx 1430 tons.

The role of Tween 80 and SDS in the kinetics of semi-clathrate hydrates formation for carbon dioxide capture from flue gas

2021 ◽  
pp. 1-15
Author(s):  
Anton Petukhov ◽  
Artem Atlaskin ◽  
Maria Sergeeva ◽  
Sergey Kryuchkov ◽  
Dmitry Shablykin ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Flue Gas ◽  
Carbon Dioxide Capture ◽  
Tween 80 ◽  
Clathrate Hydrates ◽  
Kinetics Of

scholarly journals Pressureless sinterability study of ZrB2–SiC composites containing hexagonal BN and phenolic resin additives

2021 ◽  
Vol 1 (2) ◽  
pp. 99-104
Author(s):  
Iman FarahBakhsh ◽  
Riccarda Antiochia ◽  
Ho Won Jang
Keyword(s):  
Phenolic Resin ◽  
Vacuum Furnace ◽  
Sintering Process ◽  
Powder Mixtures ◽  
Cold Pressing ◽  
X Ray ◽  
Sic Ceramics ◽  
Sic Composites ◽  
By Products

This research is dedicated to the role of different amounts of hexagonal BN (hBN: 0, 1.5, 3, and 4.5 wt%) on the pressureless sinterability of ZrB2–25 vol% SiC ceramics. Phenolic resin (5 wt%) with a carbon yield of ~40 % was incorporated as a binder to the powder mixtures and after initial cold pressing, the final sintering process was performed at 1900 °C for 100 min in a vacuum furnace. The as-sintered specimens were characterized by X-ray diffractometry, field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The results disclosed that the incorporation of 1.5 wt% hBN could increase the relative density to ~92%, while the sample with zero hBN content just reached ~81% of full densification. Appropriate hBN content not only facilitated the particle rearrangement during the cold pressing, but also removed the harmful oxide impurities during the final sintering. Nevertheless, the addition of higher amounts of hBN remarkably lessened the densification because of more delamination of the non-reacted hBN flakes and release and entrapment of more gaseous by-products induced by the reacted hBN phases.

scholarly journals Implementation of green extraction and isolation methodologies for the recovery of bioactive compounds from olive-growing products and by-products

2014 ◽  
Author(s):  
Νικόλαος Ξυνός
Keyword(s):  
Subcritical Water ◽  
Pilot Scale ◽  
Biological Properties ◽  
Added Value ◽  
Green Extraction ◽  
Kernel Oil ◽  
Olive Kernel ◽  
Table Olive ◽  
Phd Thesis ◽  
By Products

The experimental work of this PhD thesis has been scheduled on a three-axis base. Theaims that were set, they concerned the optimal exploitation of four different by-products of the table olive, olive oil and olive kernel oil industries, for the recovery of specific highadded-value compounds with well-known biological properties. Those natural productswere desired either in the form of enriched fractions or pure compounds. The prerequisitewas to utilize as eco-friendly technologies as possible for extraction and purification and tooptimize the processes in laboratory as well as in pilot scale. Thus, trustworthy estimationof industrial feasibility is provided. The main technologies that were implicated for therecovery of the target compounds are: Supercritical fluid extraction Pressurized liquid (and subcritical water) extraction Liquid/liquid extraction Adsorption resin technology Centrifugal Partition ChromatographyThe by-products that were the subject of the tracing/ extraction/ enrichment/identification/ quantification on studies for this PhD thesis were the following: Olive leaves (by-products of the pruning of the trees and of the olive fruit harvest) Olive mill pomace waste (biphasic process) Table olive process wastewater (by-product of the debittering process for theproduction of table olives) Olive kernel oil deodorization distillates (by-product of the refining process for theproduction of olive kernel oil from olive pomace)The natural compounds that were targeted for their recovery, enrichment and isolation dueto their well-established (and still under research) biological properties and theirapplication in pharmaceutical, phytotherapeutical, nutraceutical, cosmetic andcosmeceutical industries were respectively: Oleuropein Hydroxytyrosol SqualeneIn all cases, not only biomarkers’ content but also the overall chemical profile of theextracts was studied. The applied scientific interest of this work was that novel green extraction technologies and combinatorial processes as well as experimental design wereimplemented in lab and pilot scale for the exploitation of certain by-products that occur invery large quantities every year as a result of the agricultural/ industrial processing of theolive tree, with the aim of recovering high added value natural products.

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