Wyniki wyszukiwania - Biblioteka Nauki

1

Field Testing of Acoustic Cleaning System Working in 670Mwth CFB Boiler

100%

Mirek P.

Chemical and Process Engineering

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2013

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tom 34

|

nr 2

283-291

EN

The article reports the results of measurements of the acoustic pressure of acoustic waves generated by acoustic dust cleaners mounted in the convection pass of the 670MWth Circulating Fluidised Bed boiler. Based on measurements carried out and the spectral analysis of recorded signals it was found that the level of acoustic pressure generated by acoustic cleaners for the frequency of 100 Hz was too low for the efficient cleaning of the heated surfaces of the reheater RH2 and superheater SH3.

2

Numerical Optimization of Air Flow in the Plenum Chamber of an Industrial CFB Boiler

100%

Mirek P. , Jabłoński J. , Nowak W.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2008

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tom Vol. 12, No 3-4

237-244

EN

The article presents the results of experimental and numerical studies on windboxes operating in a 235MWe Circulating Fluidized Bed (CFB) boiler. The main problems of windbox designs have been identified and a modified internal geometry has been proposed which causes a more uniform flow under the grid and prevents the velocity field from formation of dead zones.

3

A simplified methodology for scaling hydrodynamic data from Lagisza 460 MWesupercritical CFB boiler

100%

Mirek P.

Chemical and Process Engineering

|

2011

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tom 32

|

nr 4

245-253

EN

The paper presents the results of model studies on the hydrodynamics of the world's first supercritical circulating fluidized bed boiler Lagisza 460 MWe, carried out on a scale model built in a scale of 1/20 while preserving the full geometrical similarity. To reflect the macroscopic pattern of flow in the boiler's combustion chamber, tests were carried out based on two dimensionless flow dynamic similarity criteria, while maintaining a constant Froude number value between the commercial and the scaled-down units. A mix of polydispersion solids with its fractional composition determined by scaling down the particle size distribution of the boiler's inert material was utilised for the tests using a special scaling function. The obtained results show very good agreement with the results of measurements taken on the Lagisza 460 MWe supercritical CFB boiler.

4

Numerical Investigation on Hydrodynamic Combustion and NO_x Emission Behavior in 8 MW Circulating Fluidized Bed

88%

İpek O. , Gürel B. , Kan M.

Acta Physica Polonica A

|

2017

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tom 132

|

nr 3

553-557

EN

Multi-phase flow is one of the types of flow which is frequently observed in natural phenomena and engineering applications. Circulating fluidized beds constitute an important application of multi-phase flow. The combustion and emission behaviours in circulating fluidized beds are determined by hydrodynamic of bearing. The most appropriate combustion can be provided with the hydrodynamic structure of bearing, taking into account fuel and operating parameters. Therefore, the hydrodynamic structure of circulating fluidized beds should be displayed with mathematical/physical modelling and simulation approach for its analysis and synthesis. Mathematical analysis in today's conditions is very difficult or impossible because of excessive turbulence, unstable and two-phase flow characteristics of the bed. Therefore, the most effective way to do this is the use the physical modelling and simulation approach. In this study, 8 MW circulating fluidized bed hydrodynamic analysis are made by ANSYS-FLUENT R14 commercial CFD code and then combustion and emissions analysis are made with hydrodynamic analysis results. These analysis results show that combustion chamber exit mean NO_x emission was 38.5 ppm and combustion chamber exit mean temperature was 1123 K.

5

Simulation of circulating fluidized bed gasification for characteristic study of pakistani coal

88%

Ramzan N. , Athar M. , Begum S. , Ahmad S. W. , Naveed S.

Polish Journal of Chemical Technology

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2015

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tom Vol. 17, nr 1

66--78

EN

A process model for turbulent pressurized circulating fluidized-bed coal gasifier is created using ASPEN PLUS software. Both hydrodynamic and reaction kinetics parameter are taken into account, whose expressions for fluidized bed are adopted from the literature. Various reactor models available in ASPEN PLUS with calculator as External Block are nested to solve hydrodynamics and kinetics. Multiple operational parameters for a pilot-plant circulating fluidized-bed coal gasifier are used to demonstrate the effects on coal gasification characteristics. This paper presents detailed information regarding the simulation model, including robust analysis of the effect of stoichiometric ratio, steam to coal ratio, gasification temperature and gasification agent temperature. It is observed that, with the increase in the flow rate of air, the components hydrogen, carbon monoxide, carbon dioxide and methane reduce, which causes the Lower Heating Value (LHV) of synthesis gas (Syn. Gas) to decrease by about 29.3%, while increment in the steam flow rate shows a minute increase in heating value of only 0.8%. Stoichiometric ratio has a direct relationship to carbon conversion efficiency and carbon dioxide production. Increasing the steam to coal ratio boosts the production of hydrogen and carbon monoxide, and causes a drop in both carbon dioxide concentration and the conversion efficiency of carbon. High gasifying agent temperature is desired because of high concentration of CO and H2 &ensp, increasing carbon conversion and LHV. A high gasifying agent temperature is the major factor that affects the coal gasification to enhance H2 &enspand CO production rapidly along with other gasification characteristics.

6

Simulation of circulating fluidized bed gasification for characteristic study of pakistani coal

88%

Ramzan N. , Athar M. , Begum S. , Ahmad S. W. , Naveed S.

Polish Journal of Chemical Technology

|

2015

|

tom 17

|

nr 1

66-78

EN

A process model for turbulent pressurized circulating fluidized-bed coal gasifier is created using ASPEN PLUS software. Both hydrodynamic and reaction kinetics parameter are taken into account, whose expressions for fluidized bed are adopted from the literature. Various reactor models available in ASPEN PLUS with calculator as External Block are nested to solve hydrodynamics and kinetics. Multiple operational parameters for a pilot-plant circulating fluidized-bed coal gasifier are used to demonstrate the effects on coal gasification characteristics. This paper presents detailed information regarding the simulation model, including robust analysis of the effect of stoichiometric ratio, steam to coal ratio, gasification temperature and gasification agent temperature. It is observed that, with the increase in the flow rate of air, the components hydrogen, carbon monoxide, carbon dioxide and methane reduce, which causes the Lower Heating Value (LHV) of synthesis gas (Syn. Gas) to decrease by about 29.3%, while increment in the steam flow rate shows a minute increase in heating value of only 0.8%. Stoichiometric ratio has a direct relationship to carbon conversion efficiency and carbon dioxide production. Increasing the steam to coal ratio boosts the production of hydrogen and carbon monoxide, and causes a drop in both carbon dioxide concentration and the conversion efficiency of carbon. High gasifying agent temperature is desired because of high concentration of CO and H2, increasing carbon conversion and LHV. A high gasifying agent temperature is the major factor that affects the coal gasification to enhance H2 and CO production rapidly along with other gasification characteristics.

7

Effect of flue gas recirculation on heat transfer in a supercritical circulating fluidized bed combustor

75%

Błaszczuk A.

Archives of Thermodynamics

|

2015

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tom Vol. 36, no. 3

61--83

EN

This paper focuses on assessment of the effect of flue gas recirculation (FGR) on heat transfer behavior in 1296t/h supercritical coal-fired circulating fluidized bed (CFB) combustor. The performance test in supercritical CFB combustor with capacity 966 MWth was performed with the low level of flue gas recirculation rate 6.9% into furnace chamber, for 80% unit load at the bed pressure of 7.7 kPa and the ratio of secondary air to the primary air SA/PA = 0.33. Heat transfer behavior in a supercritical CFB furnace between the active heat transfer surfaces (membrane wall and superheater) and bed material has been analyzed for Geldart B particle with Sauter mean diameters of 0.219 and 0.246 mm. Bed material used in the heat transfer experiments had particle density of 2700 kg/m3. A mechanistic heat transfer model based on cluster renewal approach was used in this work. A heat transfer analysis of CFB combustion system with detailed consideration of bed-to-wall heat transfer coefficient distributions along furnace height is investigated. Heat transfer data for FGR test were compared with the data obtained for representative conditions without recycled flue gases back to the furnace through star-up burners.

8

Modelowanie hydrodynamiki przepływu dwufazowego gaz-ciało stałe w kotle z cyrkulacyjną warstwą fluidalną

75%

Fuzowski K. , Stelmachowski M. , Zarzycki R.

Chemia i Inżynieria Ekologiczna

|

2005

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tom Vol. 12, nr s1

47-58

PL

Dokonano symulacji hydrodynamiki cyrkulacyjnego kotła fluidalnego (CFB - Circulating Fluidized Bed) z użyciem oprogramowania FLUENT 6.0. Dwuwymiarowy model matematyczny kolumny podstawowej kotła CFB korzystał z eulerowskiego wielofazowego modelu CFD (Computational Fluid Dynamics), stosującego podstawowe równanie Naviera-Stokesa do opisu fazy stałej i gazowej. Równania ciągłości dla fazy stałej wynikały z kinetycznej teorii granularnego przepływu, którą stosuje się zwykle do opisu fazy stałej przy eulerowskim opisie przepływu dwufazowego. Obiektem modelowanym była kolumna podstawowa kotła CFB o skali odpowiadającej instalacji laboratoryjnej i wymiarach 0,08 x 0,03 x 1,53 m. Obliczenia symulacyjne wykonano dla dwóch różnych materiałów warstwy (piasku i korundu), która w obu przypadkach składała się z trzech frakcji o różnych średnicach ziarna, oraz dla trzech wartości objętościowego natężenia przepływu gazu (powietrza). Stężenie materiału warstwy wynosiło 5% obj. Obliczenia wykonano dla warunków izotermicznych w temperaturze 295 K. Wyniki obliczeń numerycznych przedstawiono w postaci wykresów zależności udziału fazy stałej oraz prędkości fazy stałej wzdłuż wysokości dla płaszczyzny symetrii kolumny, a także w postaci rozkładu udziału fazy stałej i prędkości fazy stałej w przekroju poprzecznym dla trzech wysokości kolumny, dla czasu rzeczywistego trwania procesu równego 10 s. Pokazano także konturowy wykres rozkładu fazy stałej wzdłuż wysokości w płaszczyźnie symetrii kolumny. Uzyskane wyniki obliczeń są zgodne z opublikowanymi danymi otrzymanymi poprzez modelowanie przepływu dwufazowego gaz-cialo stałe w podobnych układach geometrycznych i dla mediów o podobnych właściwościach fizykochemicznych.

EN

This work presents a method of simulation of circulating fluidized bed hydrodynamics based on Fluent 6.0. The study deals with the 20 model of a laboratory-scale riser of CFB boiler with a square cross section. The dimensions of the riser were 0.08 x 0.03 x 1.53 m, corresponding to (width) x (depth) x (height). The numerical model is based on the two-dimensional (20) multiphase computational fluid dynamics (CFO) model (based on Navier-Stokes equations) that used an Eulerian description for gas and solid phases. The conservation equations of mass and momentum transfer were based on the kinetic theory for granular flow that gives the best, adequate modeling of solid phase for Eulerian approach. The numerical calculations were performed in isothermal conditions at temperature 295 K. Silica sand and corundum were used as a fluidized bed. The particles bad diameters: 100-200, 200-400 and 400-500 [mu]m. The mean concentration of the solid in the riser was 5% vol. The flow fate of gas was changed from 11 to 18 m3/h in the numerical simulation. Results of the calculations were presented in the plots of the volumetric solid concentration and particle velocity as a function of the riser height. The profile of axial particle velocity, axial volumetric solid concentration and contour plots of solid volume fraction in the riser of the CFB boiler were shown too. The results of calculations are presented for simulations of 10 s real time. The results compare relatively well with other results that can be found for similar systems in other articles.

9

Experimental investigation into coal-biomass-water fuels combustion in a circulating fluidized bed

75%

Kijo-Kleczkowska A. , Kosowska-Golachowska M. , Luckos A. , Środa K.

Archiwum Gospodarki Odpadami i Ochrony Środowiska

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2014

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tom Vol. 16, nr 2

85--92

EN

Coal upgrading processes (screening, washing etc.) generate large quantities of fine and ultra-fine coal particles usually in the form of coal-water slurries. Utilization of these waste-coals is a preferable option to their disposal and offers opportunities for adding value. Direct combustion of coal slurries can eliminate troublesome dewatering and drying processes. Combustion or co-combustion of coal slurries with other fuels (higher quality coal, biomass) in circulating fluidized-bed (CFB) boilers is the best option for their utilization. High combustion efficiencies can be achieved provided that the combustion process is properly designed to take into account the unique properties of the fuel. Because biomass is considered as a carbon-neutral fuel, co-combustion of coal slurries with biomass can lower the CO2 footprint and decrease the cost of electricity. This paper describes the results of experiments carried out in a laboratory-scale CFB combustor with coal-biomass-water fuels. It has been found that the combustion time and ignition temperature decrease with an increase in the biomass content in the fuel and the superficial gas velocity.

PL

Niekorzystny bilans paliwowy naszego kraju powoduje nadmierne obciążenie środowiska, wywołane emisją NOx, SO2, CO2 i pyłów, a także powiększeniem powierzchni koniecznych na składowanie narastających stałych odpadów paleniskowych. Górnictwo, zmuszane dostarczać energetyce coraz lepsze paliwo, musi stosować głębsze wzbogacanie węgla. Powoduje to ciągły wzrost odpadów w postaci mułów poflotacyjnych. Najlepszą metodą utylizacji tych mułów jest ich spalanie w postaci zawiesin oraz współspalanie z innymi paliwami, prowadzone przede wszystkim w kotłach fluidyzacyjnych. Z drugiej strony, rozwój technologii wykorzystania biomasy na cele energetyczne daje szereg przyszłościowych korzyści. Biomasa jest jednym z najbardziej obiecujących źródeł energii odnawialnej w Polsce, a jej współspalanie z węglem znajduje w ostatnich latach coraz szersze zastosowanie, zarówno w Polsce, jak i na świecie. Praca podejmuje wyniki badań eksperymentalnych współspalania węgla z biomasą w postaci zawiesin w warunkach cyrkulacyjnej warstwy fluidalnej. Stwierdzono m.in. skrócenie czasu spalania paliwa oraz obniżenie temperatury jego zapłonu za pośrednictwem części lotnych, w miarę wzrostu zawartości biomasy w zawiesinie.

10

Zastosowanie dodatków do węgla kamiennego w celu zmniejszenia zawartości SO2 i NOx w spalinach z instalacji pilotowej z cyrkulacyjną warstwą fluidalną. Cz. 1, Dodatek surowego wodorowęglanu sodu

75%

Markiewicz D. , Szymanek A. , Szymanek P. , Ochodek T.

Przemysł Chemiczny

|

2013

|

tom T. 92, nr 5

660-663

11

Badanie dysz powietrznych dla kotłów z cyrkulacyjną warstwą fluidalną

75%

Mirek P. , Nowak W. , Bis Z. , Andrzejczyk M.

Gospodarka Paliwami i Energią

|

2004

|

tom nr 2

29-34

PL

Przedstawiono wyniki badań dysz powietrznych stosowanych w kotłach z cyrkulacyjną warstwą fluidalną. Główną uwagę poświęcono analizie przyczyn związanych z problemem przesypywania się materiału sypkiego do skrzyni powietrznej. Na podstawie szeregu doświadczeń laboratoryjnych sformułowano wnioski określające warunki występowania przepływu wstecznego do skrzyni powietrznej.

EN

In this paper the results of experimental studies of air nozzles used in circulating fluidised bed boilers are presented. The main emphasis was placed on the analysis of reasons and conditions of the back-flow of loose material into the air chamber.

12

The impact of bed particle size in heat transfer to membrane walls of supercritical CFB boiler

75%

Błaszczuk A. , Nowak W. , Jagodzik S.

|

13

Two phase flow modeling in circulating fluidized bed for different number of solid fractions and different geometry configurations

75%

Fuzowski K. , Stelmachowski M.

Archives of Thermodynamics

|

2006

|

tom Vol. 27, no. 4

99-110

EN

Results of modeling of two phase gas-solid flow hydrodynamics in a fluidization column and column - cyclone - recirculation system are discussed in this study. A mathematical model is proposed implemented in FLUENT 6.2 commercial solver as well as in Kinetics Theory of Granular Flow. Simulation was carried out for several solid fractions. The influence is shown of an increased quantity of the solid fraction on stability circulation inside the column and external circulation in a complete system. Solid mass flux balance is presented in three characteristic points, and also the axial solid velocity distribution and solid volume fraction in the third characteristic column height. The proposed model predicts correctly the hydrodynamics of gas-solid flow in a circulating fluidized bed, with characteristic solid fluctuation and solid fraction distribution and velocity, observed also in a real laboratory column.

14

Warunki pracy komory paleniskowej kotła z CWF w dużej skali przemysłowej

75%

Sekret R. , Nowak W.

Zeszyty Naukowe. Elektryka / Politechnika Opolska

|

2004

|

tom Vol. 295, z. 53

527-534

PL

W pracy dokonano analizy wyników badań poboru materiału warstwy z komory paleniskowej kotła z cyrkulacyjną warstwą fluidalną (CWF) o mocy 670 MW,. Na podstawie przeprowadzonych badań stwierdzono obecność silnego strumienia masy ziaren materiału warstwy opadającego w sąsiedztwie ścian komory paleniskowej. Poza obszarem przyściennym obserwowano intensywny unoś ziaren w kierunku wlotu do cyklonów. Uzyskane wyniki potwierdziły zatem występowanie struktury rdzeń - warstwa przyścienna w obszarze rozrzedzonym struktury cyrkulacyjnej warstwy fluidalnej kotła dużej mocy. Udział powierzchni warstwy przyściennej w całkowitym przekroju komory paleniskowej badanego kotła o mocy 670 MW, był ponad 5 razy mniejszy w porównaniu do jednostki o mocy 12 MWt.

EN

The paper includes studies on analysis of solids suction from a 670 MWt CFB boiler. The presence of a concentrated solids flux was detected at the wall of the combustion chamber. In the core region of the combustion chamber, an intensive solids elutration phenomenon into the cyclones was observed, thus indicating the existence of the core-wall layer flow in a large scale CFB boiler combustion chamber. The area occupied by the wall layer flow of a 670 MWtt unit was roughly 5 times less compared to the results obtained from a 12 MWth CFB boiler.

15

Operating conditions of the upper part of a circulating fluidized-bed boiler combustion chamber in a large technical scale

75%

Sekret R. , Nowak W.

Archiwum Energetyki

|

2006

|

tom T. 35, nr 2

103-124

EN

An analysis of the behavior of bed material particles in the upper part of the combustion chamber of a circulating fluidized-bed (CFB) boiler in a large technical scale was undertaken in the study. The tests were carried out a 670 MW boiler. Based on the tests carried out on the 670 MW boiler, the presence of a strong mass flux of bed material particles descending in the vicinity of the combustion chamber walls along with an intensive lifting of the particles towards the cyclone inlet in the remaining CFB part was found. Thus, the "core-wall boundary layer" was found to exist in the dilute region of the circulating fluidized bed of a large-power boiler. The analysis of the results also demonstrated a reduction in the fraction of the wall boundary layer area in the horizontal section of the combustion chamber with increasing technical scale of CFB boilers. This effect was a result of a lowering of internal particle circulation in the dilute region with increasing combustion chamber overall dimensions, i.e. with a reduction of the combustion chamber's Hk/'Da ratio. An increase in the velocity of particles falling down in the vicinity of the combustion chamber with increasing hydrodynamic wall boundary layer thickness was also observed.

PL

W pracy dokonano analizy zachowania się ziaren materiału warstwy w górnej części komory paleniskowej kotła z cyrkulacyjną warstwą fluidalną (CWF) w dużej skali technicznej. Na podstawie przeprowadzonych badań na kotle 670 MW stwierdzono obecność silnego strumienia masy ziaren materiału warstwy opadającego w sąsiedztwie ścian komory paleniskowej oraz ich intensywny unos w kierunku wlotu do cyklonów w pozostałej części CWF. Potwierdzono tym samym istnienie struktury "rdzeń - strefa przyścienna" w obszarze rozrzedzonym cyrkulacyjnej warstwy fluidalnej kotła dużej mocy. Analiza wyników wykazała dodatkowo obniżenie udziału powierzchni strefy przyściennej w przekroju poziomym komory paleniskowej wraz ze wzrostem skali technicznej kotłów z CWF. Efekt ten był wynikiem obniżenia wewnętrznej cyrkulacji ziaren w obszarze rozrzedzonym wraz z ze wzrostem gabarytów komory paleniskowej, tj. obniżeniem jej stosunku Hk/De. Zaobserwowano również wzrost prędkości ziaren opadających w sąsiedztwie ścian komory paleniskowej wraz z zwiększeniem grubości hydrodynamicznej strefy przyściennej.

16

Field testing of acoustic cleaning system working in 670MW CFB boiler

75%

Mirek P.

Chemical and Process Engineering

|

2013

|

tom Vol. 34, nr 2

283--291

EN

The article reports the results of measurements of the acoustic pressure of acoustic waves generated by acoustic dust cleaners mounted in the convection pass of the 670MWth Circulating Fluidised Bed boiler. Based on measurements carried out and the spectral analysis of recorded signals it was found that the level of acoustic pressure generated by acoustic cleaners for the frequency of 100 Hz was too low for the efficient cleaning of the heated surfaces of the reheater RH2 and superheater SH3.

17

Badania emisji zanieczyszczeń z kotła CWF 235 MWe

75%

Czakiert T. , Nowak W. , Andrzejczyk M.

Inżynieria i Ochrona Środowiska

|

2002

|

tom T. 5, nr 1

91-97

PL

Przedstawiono analizę danych dotyczących emisji zanieczyszczeń gazowych SO2 i NOx oraz pyłu lotnego z kotłów CWF (Cyrkulacyjna Warstwa Fluidalna) 235 MWe, uzyskanych w wyniku badań przeprowadzonych w Elektrowni Turów na kotłach CWF 670t/h nr 1 i nr 2. Analizując wyniki pomiarów, określono wpływ obciążenia kotła, temperatury warstwy fluidalnej, stosunku molowego Ca/S oraz współczynnika nadmiaru powietrza na wielkość emisji wymienionych zanieczyszczeń. Potwierdzono zależność wzrostu sprawności odsiarczania gazów spalinowych wraz ze zwiększaniem ilości sorbentu podawanego do komory paleniskowej, przedstawiono także wpływ obciążenia kotła na wartość koncentracji dwutlenku siarki w spalinach. Potwierdzono również tendencję wzrostu wielkości emisji tlenków azotu w miarę podwyższania temperatury panującej wewnątrz komory spalania oraz wzrostu stężenia NOx w gazach wylotowych wraz z wartością współczynnika nadmiaru podawanego powietrza. Analiza koncentracji popiołu lotnego w spalinach przeprowadzona została z kolei pod kątem wpływu obciążenia kotła.

EN

To run in this article data of SO2, NOx and fly ash emissions from the 235 MWe CFB (Circulating Fluidized Bed) boilers have been worked out on the basis of the research in Turow Power Station on the 670 t/h CFB boilers no. 1 and no. 2. On the basis of the analysis of measurement results it has been described, among other things, the effect of boiler load, fluidized bed temperature, Ca/S molar ratio and air excess ratio on the scale of emissions. Application in the power industry and heat engineering fuel combustion by fluidized bed technique offers the possible broad range of fuel recycling, among other things low-calorie fuel, high-ash fuel and high-humidity fuel. It offers to reduce pollutant emissions such as SO2 and NOx, too. Quick development of fluidized combustion technique gives many interesting constructions of fluidized bed boilers. One of them is fuel combustion in the circulating fluidized bed. Owing to uncomplicated furnace gas desulphurization technique, which is realized simultaneously with the combustion process and relatively low investment and utilization cost, fluidized combustion technology in a circulating bed is very attractive. Besides, desulphurization efficiency 80÷95% is possible at 2÷4 Ca/S molar ratio, depending on sulphur content in the fuel. Owing to low temperature of the combustion process and air staging without use additional installation the level 200÷300 mg/Nm3 of NOx emission is obtained. To present in this article study of SO2, NOx and fly ash emissions have been realized in Turow Power Station on the 235 MWe CFB boilers. So far, the boilers have been brown coal-fired. During research, the feed fuel has had 9600÷11300 kJ/kg calorific value and the contents of coal, sulphur, fly ash ranged from 26.5 to 30.5%, 0.28 to 0.64%, 9.7 to 16.5%, respectively. The applied sorbent has been powdered calcium carbonate CaCO3 had. During measurements, the feed sorbent has been 97% CaCO3. Since the boilers are chiefly operated at 100% load, the special emphasis has had placed on study of pollutant emissions during 100% boilers load. The analysis of measurement result shows that the desulphurization efficiency has increased by 5% when the Ca/S mole ratio increased from 2.58 to 3.13, at 100% boiler load. The SO2 concentration in the flue gas has increased when the boiler load increased. The measurement results of NOX emissions show that the NOX concentration in the exhaust gas has increased when the bed temperature increased from 874 to 886°C, at 100% boiler load. The NOX concentration in the flue gas has increased when the air excess ratio increased. However, the measurement results of fly ash emissions show that the fly ash concentration in the exhaust gas has increased insignificantly when the boiler load increased from 50 to 100%.

18

A simplified methodolgy for scaling hydrodynamic data from Lagisza 460 MWC supercritical CFB boiler

75%

Mirek P.

Chemical and Process Engineering

|

2011

|

tom Vol. 32, nr 4

245-253

EN

The paper presents the results of model studies on the hydrodynamics of the world's first supercritical circulating fluidized bed boiler Lagisza 460 MWe, carried out on a scale model built in a scale of 1/20 while preserving the full geometrical similarity. To reflect the macroscopic pattern of flow in the boiler's combustion chamber, tests were carried out based on two dimensionless flow dynamic similarity criteria, while maintaining a constant Froude number value between the commercial and the scaled-down units. A mix of polydispersion solids with its fractional composition determined by scaling down the particle size distribution of the boiler's inert material was utilised for the tests using a special scaling function. The obtained results show very good agreement with the results of measurements taken on the Lagisza 460 MWe supercritical CFB boiler.

19

Zastosowanie dodatków do węgla kamiennego w celu zmniejszenia zawartości S02 i NOx w spalinach z instalacji pilotowej z cyrkulacyjną warstwą fluidalną. Cz. 2, Dodatek wapienia i mieszanek wapienia z surowym wodorowęglanem sodu

75%

Markiewicz D. , Szymanek A. , Szymanek P. , Ochodek T.

Przemysł Chemiczny

|

2013

|

tom T. 92, nr 6

924--927

20

Field Testing of Acoustic Cleaning System Working in 670Mwth CFB Boiler

75%

Mirek P.

|