SU1122867A1 - Rapid heating furnace - Google Patents

Abstract

HIGH-SPEED ILGREVA FURNACE mainly for titanium billet blanks, containing a lined metal case, a working chamber, a combustion chamber with crushed burner and gas and air nozzles located on the bottom under a layer of refractory material that differs from that with increasing heating quality , coTi; ia are substituted by the middle lines of equal-sized annular hearth areas with a pitch of 2.5-3 d., where d (is the diameter of the nozzle. (L with S N3 00 O5

Description

one

The invention is intended for the heating of billets of titanium alloys for deforming operations and for OO to be used in metallurgy and mechanical engineering.

A known furnace for heating metal products under deforming operations, containing a body and a crucible, between which crushed refractory material is placed, the gas-air mixture is supplied to it through a channel made in the center of the bottom of the body. The advantage of furnaces in which combustion is carried out in a layer of crushed refractories is their compactness, the possibility of creating high thermal stresses and the high emissivity of the end heat transfer surface of the layer, in contrast to the low luminosity when burning gas in torch 1.

The disadvantage of the furnace is the uneven distribution of the floor temperature over the heat transfer surface of the heating of the crucible as a result of the central distribution of the gas-air mixture in the bottom of the combustion chamber.

Also known is a heating furnace, comprising a lined metal body, a working chamber and a combustion chamber in which the fuel is burned in the volume of crushed refractory material. Air is supplied under crushed refractory through nozzles evenly spaced on the floor of the chamber, and gas is supplied through nozzles evenly spaced in the C23 gas supply pipes.

A disadvantage of the known furnace was the low-quality heating of the blanks due to the uneven heating of the end face of the TafTVaK refractory layer of gas burning in the layer only partially and afterburning it takes place on the surface of the layer. The need to preserve the fine structure of the material of titanium alloy blanks requires a significant reduction in heating time (high-speed heating). At the same time, under conditions of high-speed heating, the creation of a uniform temperature field becomes a necessary requirement, which excludes temperature distortions in the details, which affect its strength properties.

22867 2

 the invention of plating the heating quality of the blanks.

The above objective is achieved by the fact that in a high-speed heating furnace 5 mainly for blanks of titanium alloys containing a lined metal body, a working chamber, a combustion chamber with crushed refractory material and

0 co.pla for supplying gas and air, located on the floor under a layer of refractory, the nozzles are placed along the middle lines of equal-sized annular hearth areas with a pitch of 2.5-3c5l. where

5 seconds diameter of the nozzle.

Figure 1 shows a schematic representation of a heating furnace; section 2 is shown in Fig. 2 — placement of nozzles for supplying a gas-air mixture to equal-sized

0 squares of the rings of the plane of the hearth of the combustion chamber.

The heating furnace comprises a housing 1 with crushed refractory loaded into the working chamber 2 of the housing 1

5 Z..K to the hearth of the furnace case 1 a collector 4 is connected with the pipeline 5. At the base of the case 1 there are placed tubes 6 for supplying the gas mixture, connecting the collector 4 with a layer of crushed refractory 3. The working chamber 2 of the case 1 is closed by a heat-resistant tray 7 with perforations 8. Heat resistant tray 7 is loaded with heated blanks 9.

The furnace works as follows. Gas and air fall into the pipeline 5 in such a way: that the gas-air mixture enters the collector 4 and disperses through pipes 6 into the layer of crushed refractory 3. The gas-air mixture passing through the layer of crushed refractory 3 is ignited in a known manner.

In order to within the specified dimensions and thermal power

5 to obtain the required distribution of the temperature field over the heat plane; resistant pan 7, it is necessary to ensure uniform distribution of the gas-air mixture under the crushed layer

0 refractories,

For this purpose, it proposes the following distribution of nozzles under the surface of the layer of crushed refractories, which ensures the temperature field on

5 The surface layer of crushed refractory. ra close to homogeneous.

The effect is achieved if the bottom plane of the combustion chamber (or

Claims (1)

A FAST HEATING FURNACE is predominantly for titanium alloy billets, containing a lined metal body, a working chamber, a combustion chamber with crushed refractory material and nozzles for supplying gas and air located on the hearth under the refractory layer, which distinguishes me In order to improve the quality of heating, the nozzles are placed along the midlines of the equal-sized annular hearth areas in increments of 2.5–3 d _c , where d _{c is the} diameter of the nozzle.