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System transportu pionowego do zasilania węglem bloków energetycznych w Elektrowni „Łagisza"

Jagodzik S., Śmigielski J., Marchewka A, Kucz D., Ratuszny K., Kamiński P.

Wiadomości Górnicze

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2017

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R. 68, nr 12

595--603

PL

Przedmiotem inwestycji była budowa linii zasilania węglem bloków energetycznych 120 MW dla Tauron Wytwarzanie SA, Oddział Elektrownia „Łagisza" w Będzinie. Zadaniem instalacji jest umożliwienie transportu węgla z poziomu 0,00 budynku głównego kotłowni bloków na taśmociąg głównej dostawy węgla do kotłów zlokalizowanych na poziomie +32,7 m w rejonie po zdemontowanym kotle nr 3. Parametry instalacji miały umożliwiać osiągnięcie wydajności transportu węgla na poziomie 40 t/h. Instalacja została oparta na idei transportu pionowego kubłami urobkowymi o objętości 6 m3 oraz poziomego - wysokowydajnego przenośnika zgrzebłowego. W artykule opisano w skrócie metodykę przeprowadzonych obliczeń sprawdzających do konstrukcji umożliwiającej przemieszczanie oraz wyładunek kubłów.

EN

The subject of the investment was the construction of a coal supply line for 120 MW power units for Tauron Generation SA, „Łagisza" Power Plant Branch in Będzin. The purpose of the installation is to enable the transport of coal from the 0.00 level of the main building of the boilers block onto the main conveyor system of coal supply to boilers located at the level of +32.7 m in the area after the dismantled boiler No. 3. The parameters of the installation were to enable the coal transport capacity to be achieved at the level of 40 t/h. The installation was based on the idea of a vertical transport by the gotten buckets with the capacity of 6 m3 and a horizontal - heavy-duty scraper conveyor. This article describes briefly the methodology of performed verification calculations for the structure, allowing for displacement and unloading of the buckets.

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Bed-to-wall heat ransfer in a supercritical circulating fluidised bed boiler

Błaszczuk A., Nowak W., Jagodzik S.

Chemical and Process Engineering

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2014

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Vol. 35, nr 2

191--204

EN

The purpose of this work is to find a correlation for heat transfer to walls in a 1296 t/h supercritical circulating fluidised bed (CFB) boiler. The effect of bed-to-wall heat transfer coefficient in a long active heat transfer surface was discussed, excluding the radiation component. Experiments for four different unit loads (i.e. 100% MCR, 80% MCR, 60% MCR and 40% MCR) were conducted at a constant excess air ratio and high level of bed pressure (ca. 6 kPa) in each test run. The empirical correlation of the heat transfer coefficient in a large-scale CFB boiler was mainly determined by two key operating parameters, suspension density and bed temperature. Furthermore, data processing was used in order to develop empirical correlation ranges between 3.05 to 5.35 m x s-1 for gas superficial velocity, 0.25 to 0.51 for the ratio of the secondary to the primary air, 1028 to 1137K for bed temperature inside the furnace chamber of a commercial CFB boiler, and 1.20 to 553 kg x m-3 for suspension density. The suspension density was specified on the base of pressure measurements inside the boiler’s combustion chamber using pressure sensors. Pressure measurements were collected at the measuring ports situated on the front wall of the combustion chamber. The obtained correlation of the heat transfer coefficient is in agreement with the data obtained from typical industrial CFB boilers.

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

Błaszczuk A., Nowak W., Jagodzik S.

Archives of Thermodynamics

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2014

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Vol. 35, no. 3

207--223

EN

Experimental research has been carried out in a supercritical circulating fluidized bed combustor in order to indicate the effect of the bed particle size on bed-to-wall heat transfer coefficient. The bed inventory used were 0.219, 0.246 and 0.411 mm Sauter mean particles diameter. The operating parameters of a circulating fluidized bed combustor covered a range from 3.13 to 5.11 m/s for superficial gas velocity, 23.7 to 26.2 kg/(m2s) for the circulation rate of solids, 0.33 for the secondary air fraction and 7500 to 8440 Pa pressure drop. Furthermore, the bed temperature, suspension density and the main parameters of cluster renewal approach were treated as experimental variables along the furnace height. The cluster renewal approach was used in order to predict the bed-to-wall heat transfer coefficient. A simple semi-empirical method was proposed to estimate the overall heat transfer coefficient inside the furnace as a function of particle size and suspension density. The computationally obtained results were compared with the experimental data of this work.

4

Effects of operating conditions on DeNOx system efficiency in supercritical circulating fluidized bed boiler

Błaszczuk A., Nowak W., Jagodzik S.

Journal of Power Technologies

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2013

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Vol. 93, nr 1

1--8

EN

The purpose of this work was to determine the impact of a operating conditions on the deNOx system efficiency.in a 966MWth supercritical circulating fluidized bed boiler. Experimental tests were carried out on a full-scale DeNOx system installed in the world’s largest once through supercritical circulating fluidized bed boiler. In this work, the effects of the following parameters were studied: flue gas temperature inside the separators between 636°C and 845°C, relative ammonia mass flow over the range 0.22-1.00 and three relative values of O2 concentration (i.e. 0.94, 1.0 and 1.13). The efficiency of deNOx system increases (ca. 53%) with increasing relative ammonia mass flow. A maximum DeNOx system efficiency (ca. 70%) was achieved at flue gas temperature in the range from 720°C to 790°C. In the case of all unit loads, deNOx system efficiency from 36% to 70% was observed and performs a standard emissions relate to permissible concentration of NOx in the flue gas.

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Doświadczenia po trzech latach eksploatacji bloku 460 MW w Elektrowni Łagisza

Jagodzik S., Śmigielski J.

Energetyka

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2013

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nr 1

37-42

PL

Scharakteryzowano główne elementy budowy bloku 460 MW w Elektrowni Łagisza. Przedstawiono podstawowe parametry części turbinowej i kotłowej. Opisano wyniki rozruchu i przedstawiono kilka ważniejszych awarii, jakie miały miejsce podczas pierwszego trzyletniego okresu eksploatacji, podając jednocześnie środki zaradcze, jakie podjęto w celu usunięcia przyczyn wspomnianych awarii.

EN

Characterized are main elements of the 460 MW power unit assembling in Elektrownia Łagisza. Presented are basic parameters of the turbine and boiler parts. Described are the start-up results and presented are some more important failures which took place during the first three-years operating time, specifying at the same time some preventive measures which were taken to remove the causes of the mentioned failures.