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1

Simultaneous removal of NOx, SO2, CO and Hg from flue gas by ozonation. Pilot plant studies

Głomba M., Kordylewski W.

Environment Protection Engineering

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2014

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Vol. 40, nr 3

113--125

EN

The results of pilot plant investigations of simultaneous removal of NOx, SO2 and Hg from flue gas with ozone as the oxidizing agent and the spray tower absorber with NaOH solution as the absorbent have been presented. Flue gas was delivered into the pilot plant at the flow rate of 200 m3/h from the coal fired OP-430 boiler. The effectiveness of NOx removal was over 95% when the molar ratio O3/NO reached 2.0. Sulfur dioxide was practically completely washed out from flue gas in the absorber at the liquid-to-gas ratio 7.5 dm3/m3. The effectiveness of Hg removal in the studied system was approximately 80%. It was pointed out that CO concentration in flue gas could considerably increase the ozone consumption. The effect of carbon dioxide in flue gas on the chemistry of absorption due to hydroxides conversion into carbonates and bicarbonates was noticed.

2

CO2 reactive absorption from flue gases into aqueous ammonia solutions: The NH3 slippage effect

Budzianowski W. M.

Environment Protection Engineering

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2011

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Vol. 37, nr 4

5-19

EN

Future deployment of NH3-based CO2 capture technology into coal-fired power plants will shift unwanted emissions from those currently comprising SO2, NOx- and particulate matter towards those comprising NH3. This is due to volatility of ammonia. Therefore, the current paper aims at understanding of NH3 slippage to flue gases from the NH3-based CO2 capture process and at identifying the opportunities to limit this unwanted slippage. The paper presents experimental and 2D modeling based analysis of CO2 reactive absorption from flue gases into aqueous ammonia solutions in a falling film reactor. The results enable one to characterise hydrodynamics of the falling film reactor, to analyse the effect of pH, pressure and temperature on CO2 absorption and NH3 slippage and to explain the role of migrative transport of ionic species in total mass transport. It was found that NH3 slippage to the gaseous phase can be limited by alleviated operating temperatures, optimised pH, increased pressure and large CO2 absorption fluxes which force negative enhancement of NH3 mass transfer [16]. The NH3 slippage under CO2 capture conditions and under air stripping conditions is illustrated by experimental and simulation data. Finally, main approaches used for the integration of CCS systems into power plants are expounded.

3

Absorpcja gazu w ciekłej hipofazie w obecności zaadsorbowanej warstwy surfaktantu

Skoczek M., Gradoń L., Sosnowski T. R.

Inżynieria Chemiczna i Procesowa

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2001

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T. 22, z. 3E

1267--1272

PL

Badano doświadczalnie wpływ hydrodynamiki cienkiej warstwy cieczy (hipofazy) na szybkość absorpcji CO 2 w obecności surfaktantu fosfolipidowego. Pokazano, że dynamiczne zmiany napięcia powierzchniowego towarzyszące oscylacjom wielkości powierzchni w wadze Wilhelmy'ego - Langmuira powodują zauważalny wzrost strumienia gazu pochłanianego przez roztwór alkaliczny, za co są odpowiedzialne powstające w układzie efekty Marangoniego.

EN

The influence of hydrodynamic processes in a surfactant-rich thin liquid layer (hypophase) on the absorption rate was studied experimentally using Wilhelmy - Langmuir balance. It was shown that absorption rate for carbon dioxide in alkali solution is increased when interfacial area is varied. The mechanisms responsible for the mass transfer improvement are related to the Marangoni effects generated in this system.

4

Diffusional methods of absorption calculation

Zarzycki R.

Archiwum Ochrony Środowiska

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1999

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Vol. 25, no. 1

21-28

PL

W pracy podsumowano wieloletnie badania dotyczące matematycznego opisu absorpcji wieloskładnikowej, nieizotermicznej prowadzonej w różnych typach aparatów. Stwierdzono, że w chwili obecnej istnieją wszelkie przesłanki, aby dowolny proces absorpcji wieloskładnikowej zarówno w układach fizycznych, jak i w układach reagujących chemicznie, można było opisać metodami dyfuzyjnymi wykorzystując równanie dyfuzji wieloskładnikowej Stefana-Maxwella. Prezentowana metoda obliczeń procesów absorpcji powinna znaleźć zastosowanie w obliczeniach kolumn absorpcyjnych stosowanych w procesach ochrony powietrza.

EN

In the papaer synthesis on modelling of multicomponent gas absorption processes is presented. The proposed method of calculation can be used to all types of absorption column: plate, packed, bubble to physical and chemical processes.