The Influence of Radiation Model on the Distribution of Heat Flux in the Pusher Furnace / Wpływ Modelu Promieniowania Na Rozkład Gęstości Strumienia Ciepła W Piecu Przepychowym

Abstract

A three dimensional numerical model of the heat exchange during a charge heating process in a pusher furnace, using the finite element method, was used in this study. The radiative heat exchange in the furnace chamber was carried out based on two methods: the zone method and the method of basing on the average configuration ratio. In the zone method the flux of radiation energy reaching the surface of the heated charge was determined by performing calculations of brightness in a multi-surface closed system which is the pusher furnace chamber filled with an emitting-absorbing medium. In the second case an average configuration ratio was used by setting the radiation energy flux through linking the walls temperature with the furnace atmosphere temperature.Keywords: radiation heat transfer, pusher furnace, charge heating W pracy wykorzystano trójwymiarowy model numeryczny wymiany ciepła w czasie nagrzewania wsadu w piecu przepychowym przy zastosowaniu metody elementów skończonych. Radiacyjną wymianę ciepła w komorze pieca realizowano w oparciu o dwie metody: metodę strefową oraz w oparciu o średni współczynnik konfiguracji. W metodzie strefowej strumień energii radiacyjnej docierającej do powierzchni nagrzewanego wsadu wyznaczano prowadząc obliczenia jasności w wielo-powierzchniowym układzie zamkniętym jakim jest komora pieca przepychowego wypełnionego ośrodkiem emitująco-pochłaniającym. W drugim przypadku wykorzystano średni współczynnik konfiguracji wyznaczając strumień energii radiacyjnej poprzez powiązanie temperatury ścian z temperaturą atmosfery pieca.

Fuel Consumption Reduction Strategies for Heating Steel Charge Prior to Plastic Processing

“…Proper operation of the furnace can ensure minimization of heat consumption, scale loss as well as ensure high quality of the final products and semi-finished products [7][8][9]. Increasing the efficiency of heating furnaces is possible by modeling the phenomena occurring in them [10][11][12][13], including the oxidation of the charge [14][15][16][17][18].…”

Heat Flux Identification at the Charge Surface During Heating in Chamber Furnace

“…Emissivity ε 1 of the surface of the furnace walls is to be taken from the range of 0.75 to 0.85, depending on the type of the insulating material used in the furnace chamber. Emissivity ε 2 of the charge is to be determined from the equation [11]:…”

“…to solve the equation (1), the finite element method (feM) was used, which is based on the solution of a system of partial differential equations: (11) where:…”

The Development Of Heating Curves For Open Die Forging Of Heavy Parts

“…− average configuration coefficients, F 1 , F 2 -furnace and charge wall surface area, m 2 ε 2 -charge emissivity, e 1 , e 2 -density of own emission of wall and charge surface, W/m 2 P g1 , P g2 -transparency of the gas body radiation onto the charge and furnace wall surfaces, R 1 , R 2 -furnace and charge wall surface reflexivity, α k -convective coefficient of heat penetration at the charge surface, W/(m 2 K) T g , T 2 -absolute temperature of the furnace atmosphere and charge surface, K. The method of determination of average configuration coefficients and other parameters occurring in the formula (2) is presented in papers [11][12][13]. It was assumed that the combustion gases contain two radiating gases: CO 2 and H 2 O.…”