US1741977A

US1741977A - Electric furnace

Info

Publication number: US1741977A
Application number: US318365A
Authority: US
Inventors: Cornelius Cornelius Eric
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-01-09
Filing date: 1928-11-10
Publication date: 1929-12-31
Anticipated expiration: 1946-12-31

Description

Dec. 31, 1929 I c. E, CORNELIUS I 1,741,977

' ELECTRIC FURNACE Filed Nov. l0, 1928 CORNELIUS Ema CORNELIUS INVENTOR I Attavneytrode blocks.

Patented Dec. .31, 1929 UNITED STA CORNELIUS ERIC CORNELIUS,

or s'rocxnomn, swnnnn ELECTRIC FURNACE Application filed. November 10, 1928, Serial No. 318,365,

In electric resistance glass producing fur naces it has always .met with great difficulties to make the brickwork last. The walls .have been consumed after a short time and large hollows arise especially in the surface of the bath. Even local damages may arise in the brickwork which may only be accounted for by their flowing from local overheating of the bath. y

This invention glass producing furnace which works with out damaging the furnace lining, and in the said furnace both acid and basic substances may be molten without the lining'being im pairedto speak of.

The characteristic features of the invention are as follows. The material, i. e. glass, to be produced forms resistance to the electric current and metal blocks freestanding on the bottom of the furnace serve as electrodes, the said blocks being surrounded on all sides except on the bottom by the material to be produced. For avoiding corrosion of the bot- .tom of the furnace the lining is cooled by .water, air or in another suitable manner at a point of the lining located beneath the elec- The electrodes may be made from a single metal or from a compound metal. Hitherto, iron free from carbon (C -0.03%) has given the best result.

An embodiment of the invention is shown in the accompanying drawing where Iiigure 1 is a vertical section of the furnace an Figure 2 is a horizontal section of same.

A is the furnace lining. On the bottom of the furnace the electrodes B and B are lo cated freely and surrounded by the glass forming the molten resistance C. The electric current is supplied to the electrodes B and B by the connections D and D The electric current is transposed into heat in the zone F. In the centre of the said zone the highest temperature arises which decreases somewhat towards the opposite faces of the electrodes, but the current tends to keep the electrodes as warm as the said zone. In case the electrodes are colder than the resistance the greatest discharge of heat occurs quite has for its object an electric.

ducing glass,

near the. surfaces of the electrodes. A posi-' and in Sweden January 9, 1928.-

tion of equilibrium arises when the electrodes carry away by conduction a constant quantity of heat from the zone F to the zones E an E The zones E and E may be increased or decreased by lengthening or shortening the electrodes. By the said arrangement the furnace walls are preserved against being affected because the glass material behind the electrodes is currentless and relatively cold. ()r in other words,the proper melting takes place in the centre portion F of the furnace, far from the furnace walls. The cooling of the brickwork beneath the electrodes is effected by introducing into the tubes H and H water, air or another suitable refrigerant which escapes through the tubes K and K after the cooling. The charge is supplied 1 through an opening, not shown, in the vault of the furnace.

According to Figure 2 the furnace has five pairs of electrodes. Between each pair of electrodes there is a free space which is filled up by the molten resistance. This is also the case behind and above the electrodes. The said furnace is adapted to the melting or the production of glass, water-glass, cement, phosphates and other similar substances, and then the respective substances serve as resistance to the electric current.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. An=electric furnace for melting or prowater-glass, cement and other F substances, in which the substance which is melted or produced forms a resistance for the electric current, comprising solid metal electrodes having a large heat accumulating capacity in relation to the substance to be treated, said electrodes being freestanding on the bottom of the furnace and exposed to the liquid resistance. I

' 2. An electric furnace for melting or producing glass, water-glass, cement and other substances, in which the substance which is melted or produced forms a resistance for the electric'current, comprising solid metal electrodes having a large heat accumulating capacity in relation to the substance to be trea'ced, said electrodes being freest'a nding on the bottom of the furnace and surrounded by the iiquid resistance on all'sides, except on the ase.

In witness whereof, I have hereunto signed my name.

CORNELIUS ERIC CORNELIUS.