Wyniki wyszukiwania - BazTech

1

Computer modeling of a convective steam superheater

Trojan M.

Archives of Thermodynamics

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2015

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Vol. 36, no. 1

125--137

EN

Superheater is for generating superheated steam from the saturated steam from the evaporator outlet. In the case of pulverized coal fired boiler, a relatively small amount of ash causes problems with ash fouling on the heating surfaces, including the superheaters. In the convection pass of the boiler, the flue gas temperature is lower and ash deposits can be loose or sintered. Ash fouling not only reduces heat transfer from the flue gas to the steam, but also is the cause of a higher pressure drop on the flue gas flow path. In the case the pressure drop is greater than the power consumed by the fan increases. If the superheater surfaces are covered with ash than the steam temperature at the outlet of the superheater stages falls, and the flow rates of the water injected into attemperator should be reduced. There is also an increase in flue gas temperature after the different stages of the superheater. Consequently, this leads to a reduction in boiler efficiency. The paper presents the results of computational fluid dynamics simulations of the first stage superheater of both the boiler OP-210M using the commercial software. The temperature distributions of the steam and flue gas along the way they flow together with temperature of the tube walls and temperature of the ash deposits will be determined. The calculated steam temperature is compared with measurement results. Knowledge of these temperatures is of great practical importance because it allows to choose the grade of steel for a given superheater stage. Using the developed model of the superheater to determine its degree of ash fouling in the on-line mode one can control the activation frequency of steam sootblowers.

2

Modelowanie CFD konwekcyjnego przegrzewacza pary

Trojan M.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2014

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z. 86 [290], nr 2

269--276

PL

W artykule przedstawiono wyniki symulacji CFD w programie ANSYS-CFX przegrzewacza pierwszego stopnia w kotle OP-210M. Wyznaczono rozkład temperatury pary i spalin wzdłuż drogi ich przepływu, rozkład temperatury pary i spalin na wylocie z przegrzewacza oraz rozkład temperatury na ściance. Znajomość tych temperatur ma duże znaczenie praktyczne, ponieważ pozwala prawidłowo dobrać gatunek stali na dany stopień przegrzewacza. Korzystając z opracowanego modelu przegrzewacza do wyznaczenia stopnia jego zanieczyszczenia popiołem w trybie on-line można sterować częstotliwością aktywacji parowych zdmuchiwaczy sadzy.

EN

The paper presents the results of CFD simulations of the first stage superheater of the OP-210M boiler by using the ANSYS CFX software. The temperature distributions of the steam and flue gas along the way they flow will be determined. Furthermore, the temperature of the tube walls and temperature distribution of the steam and flue gas superheater outlet have been determined. Knowledge of these temperatures has great practical importance, because it allows to choose the grade of steel for a given superheater stage. Using the developed model of the super-heater to determine its degree of ash fouling in on-line mode one can control the activation frequency of steam soot blowers.

3

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

Mirek P.

Chemical and Process Engineering

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2013

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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.