Method for Rapid Verification of the Presence of Ammonium Salts in Fly Ash at a Concrete Plant

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21610%2F22%3A00365506" target="_blank" >RIV/68407700:21610/22:00365506 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.5593/sgem2022/6.1/s26.23" target="_blank" >https://doi.org/10.5593/sgem2022/6.1/s26.23</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5593/sgem2022/6.1/s26.23" target="_blank" >10.5593/sgem2022/6.1/s26.23</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Method for Rapid Verification of the Presence of Ammonium Salts in Fly Ash at a Concrete Plant

Popis výsledku v původním jazyce

Requirements relating to the quality of the flue gases produced have become more and more stringent in recent years. This is why the electricity producers, especially those using coal-fired units, have been forced to introduce additional environmental technologies. However, most of the coal-fired power plants and waste incineration plants in the Czech and Slovak Republics are following the same path, in particular for economic reasons. They are introducing the selective non-catalytic reduction of nitrogen oxides (SNCR). This method is based on the reduction of nitrogen oxides by injecting a solution of urea or ammonia water into the combustion chamber of the combustion unit. The captured fly ash is thus in direct contact with the injected agent. Direct contact of the high-temperature fly ash with the injected medium results in increased amounts of ammonium salts in the fly ashes that have undergone the SNCR process. The ammonium salts contained in fly ash then react very quickly with alkaline substances, such as cement in a concrete mix, producing gaseous NH3. This gas is characterized by a very unpleasant odour. Therefore, when the fly ash is used the hygiene limits might be exceeded. Very often, but it is not clear whether the fly ash brought to the concrete plant has passed the SNCR mechanism or not. That is why a quick orientation method for detecting the presence of ammonium ions in fly ash was designed and verified. Based on the result of the analysis using this method, it is possible to decide at the concrete plant whether or not the fly ash will be admitted to the silo of the concrete plant. The article briefly describes the methodology of the analysis, highlighting the advantages of the proposed method.

Název v anglickém jazyce

Method for Rapid Verification of the Presence of Ammonium Salts in Fly Ash at a Concrete Plant

Popis výsledku anglicky

Requirements relating to the quality of the flue gases produced have become more and more stringent in recent years. This is why the electricity producers, especially those using coal-fired units, have been forced to introduce additional environmental technologies. However, most of the coal-fired power plants and waste incineration plants in the Czech and Slovak Republics are following the same path, in particular for economic reasons. They are introducing the selective non-catalytic reduction of nitrogen oxides (SNCR). This method is based on the reduction of nitrogen oxides by injecting a solution of urea or ammonia water into the combustion chamber of the combustion unit. The captured fly ash is thus in direct contact with the injected agent. Direct contact of the high-temperature fly ash with the injected medium results in increased amounts of ammonium salts in the fly ashes that have undergone the SNCR process. The ammonium salts contained in fly ash then react very quickly with alkaline substances, such as cement in a concrete mix, producing gaseous NH3. This gas is characterized by a very unpleasant odour. Therefore, when the fly ash is used the hygiene limits might be exceeded. Very often, but it is not clear whether the fly ash brought to the concrete plant has passed the SNCR mechanism or not. That is why a quick orientation method for detecting the presence of ammonium ions in fly ash was designed and verified. Based on the result of the analysis using this method, it is possible to decide at the concrete plant whether or not the fly ash will be admitted to the silo of the concrete plant. The article briefly describes the methodology of the analysis, highlighting the advantages of the proposed method.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/FW01010539" target="_blank" >FW01010539: Bezpečné využití popílků z technologie redukce NOX na betonárnách ČMB</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022

ISBN

978-619-7603-48-4

ISSN

1314-2704

e-ISSN

—

Počet stran výsledku

6

Strana od-do

187-192

Název nakladatele

STEF92 Technology Ltd.

Místo vydání

Sofia

Místo konání akce

Albena

Datum konání akce

2. 7. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—