SU844586A1 - Electric heating device for glass smelting - Google Patents

Description

one

The invention relates to the construction industry and building materials, in particular, to the glass industry and can be used in electric glass furnaces for electric glass and electric heating in supply units for the production of glassware.

Heating devices based on resistance elements 1 are known.

However, it is impossible to use such heating devices based on silicon carbide resistance elements immersed in a glass melt, which are sewn up, because the glass melt material is soiled with heaters.

In addition, due to the insufficient thermal conductivity of the material, it is necessary to maintain a deliberately elevated temperature on the heaters. High temperatures lead to rapid wear and failure of the heating elements of the resistance.

The closest solution to the technical essence of the invention is an electric heating device for glass melting, containing a cylindrical chamber and resistive elements located inside the coaxial walls of the chamber, made of an electrically conductive material based on metal oxides, and a voltage source 2.

In this case, the electric glass heater is carried out by transferring heat from the heat transfer chamber immersed in the glass melt, which is heated by resistive (one or several) elements enclosed within the chamber.

Such a device for electric cooker ste10 count in connection with indirect, heat transfer

has more heat loss to the surrounding

the environment that is spent on

the amount of electricity and besides that

on resistance elements it is necessary

5 maintain elevated temperature.

In connection with indirect heating, such devices are uneconomical — they require more power consumption than direct heating devices — 90 are directly immersed in the melt and do not provide homogeneous glass melt.

The aim of the invention is to reduce the loss of electricity during heating, increase the service life of the heating device, as well as increase the homogeneity of the molten glass.

This goal is achieved by the fact that in an electric heating device for glass melting, there is a cylindrical chamber and resistive elements located inside the coaxial walls of the chamber, made of electrically conductive material based on metal metals, and a voltage source, the chamber walls are connected to a voltage source.

The electric heater contains at least two cylindrical chambers connected to a voltage source.

As the material of the chamber walls take an electrically conductive material with a p 20-50 ohm-cm.

The drawing shows a device for melting glass.

The electric heating device contains a cylindrical chamber 1 and resistive elements 2 located inside the chamber coaxially relative to the chamber walls. The walls of chamber 1 are made of an electrically conductive material with a p 20-50 ohm-cm, for example, a ceramic material based on tin dioxide (p 20-30 ohm cm). The side surface of the resistive element 2 is made with a protective coating 3 on the basis of alumina, isolating the resistive element from the camera.

In addition, the resistive element 2 is fixed in insulators 4 in order to avoid the movement of element 2 relative to chambers 1.

The wall of the chamber 1 is connected via a current lead 5 to a voltage source.

The device works as follows.

First, the current is supplied to the resistive element 2 to heat the chamber 1, which transfers heat to the glass melt, heating it to a predetermined temperature.

After the glass melt is heated, the resistive elements 2 turn on and the power supply is supplied to the chambers 1, which work as electrodes, and the resistive element is the glass melt.

Thus, they first use the heating elements of the cosine-post, and then direct heating.

To increase the efficiency of the device at elevated temperatures, resistive elements 2 and chambers 1 can be connected to power sources at the same time.

The proposed device allows reducing power losses by 20%, increasing efficiency by 10%.

Due to the fact that the glass melt performs the function of a resistive element, its homogeneity in volume is ensured.

Claims (2)

1. USSR author's certificate No. 158659, class, H 05B 3/42, 1962. 2. US Patent No. 2804492, cl. NCI 13-6, 1957.