SU1051390A1 - Device for determining temperature accuracy of furnace operation - Google Patents

Abstract

A DEVICE FOR DETERMINING THE TEMPERATURE ACCESS OF WORK OF FURNACES, containing a model of a cage, designed in the form of a low heat inertial steel structure with thermocouples installed on it, but for the purpose of pulling off the terrain (ignoring temperature accuracy by eliminating the need for a drawing from a thermometer, but because of the problem of thermal failure due to the effect of drawing a thermocouple; It does not have dimensions that coincide with the maximum maximum dimensions of the cage heated in the furnace, and is lined inside with a fibrous refractory material. (L

Description

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The invention relates to thermometry, in particular, to devices for testing chamber furnaces with the aim of determining the temperature accuracy of their operation. The temperature accuracy of the furnace operation is characterized by the deviation of the temperature on the surface of the cages heated in the furnace from the set value in the isothermal holding mode after the temperature in the working volume has stabilized. A device is known for determining the temperature accuracy of operation of furnaces, containing the charge from OPA-PYCHO or standard products with CLJ thermocouples installed on them. The disadvantage of the device is that the determination of the temperature accuracy of the operation of the furnace at different temperatures. The levels require long isothermal exposures (tens of hours, since heating large tanks require considerable time to stabilize the temperatures. Moreover, comparisons of test results for furnaces of various designs are difficult, since experiments have different configurations of tanks. a significant influence on the radiant heat transfer in the kiln-cage system and the aerodynamics of the movement of gases in the working air, and, consequently, on the temperature distribution in the charge. closer to the technical essence and the achieved result to the proposed one is a device for determining the temperature accuracy of the furnaces, containing a cage made in the form of a low heat inertial steel structure with installed C-2 thermocouples J. The disadvantage of the device is that the unevenness The temperature at such a charge, recorded by thermocouples, is less than when heated from a massive product, due to reradiation through its internal region. The latter leads to a significant increase in the error in determining the temperature accuracy. The purpose of the invention is to reduce the temperament of determining the temperature accuracy by eliminating the effect of reradiation through the inner region of the charge. To achieve this goal in a device for determining the temperature accuracy of the furnace containing the model cages vsholnennuyu as maloteploinertsionnoy steel konstrukdyi with the attached thermocouples modesch on sad1sh vsholnena with dimensions that coincide with predetermined maximum dimensions heated in the tank furnace, and lined inside fibrous refractory material. FIG. 1 shows a device for determining the temperature accuracy of operation of furnaces, a general view; in fig. 2 shows section A-A in FIG. 1. The model of the charge consists of a body 1,. / Made of metal sheets and provided with ribs 2 stiffness. Case 1 is internally lined with light fibrous refractory material 3, thermocouples 4 are installed on the surface of case 1. Model of the tank is mounted on supports 5 and placed on the bottom 6. Dimensions of the MODEL of the tanks are the same as those of the maximum tank. The lining thickness of light fiber refractories should be no less than 2-3 cm. When fulfilling this condition, the bL 151 criterion is the thickness of the lining, m the heat transfer coefficient by radiation and convection in the furnace (in the temperature range of heat treatment of metal o (30200 W / (m2-K ), the thermal conductivity coefficient of the lining material (for fiber refractories A 0.150, 3 W / (m K). In VI, heat transfer through the internal area of the charge does not equalize;: "The shny on the temperature distribution on its outer surface. The device works as follows. follows cages heating furnace and the isothermal hold on the surface cages We establish 1ets dis-determination temperature registered by thermocouples. The high tochnostpoluchaemyh proposed model using data of the cage is achieved by the presence of the lining, obe.spechivayuschey obtaining local temperature non-uniformities in the device not corresponding enshe s, values

for any standard charge (by choosing the overall dimensions of the device that are equal to the maximum charge, ensuring that the character of the gas movement in the furnace coincides during the tests and during the processing of the standard charge.

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Claims (1)

DEVICE FOR DETERMINING THE TEMPERATURE ACCURACY OF FURNACE OPERATIONS, containing a model cage made in the form of a low-heat inertial steel structure with thermocouples installed on it, characterized in that, in order to reduce the accuracy of the tour accuracy for reradiation, the yen with dimensions given by the maximum dimensions of the furnace heated cage, and lined from the inside with fibrous refractory material. determining the temperature count of the exclusion of the model cage coinciding with the influence of pol - ea- SU,.,. 1051399