SU1381081A1 - Three-phase electric glass-melting furnace - Google Patents

Abstract

This invention relates to the building materials industry, in particular to glass melting devices. The purpose of the invention is to improve the quality of glass and increase the productivity of the furnace. The glass melting furnace contains a cooking basin 1, equipped with flat wall electrodes 4, which are connected to a power supply system with the possibility of phase-by-phase adjustment. The cooking basin 1 is made stepwise with a width between steps 2 equal to 0.2 - 0.5 times the distance between the wall electrodes. Adjacent pairs of electrodes from 4 neighboring zones of three-phase heating are connected to the phases of the same name. In this case, the distance between adjacent electrodes located in adjacent zones is 0.5-1.0 distances between electrodes in one zone. The furnace allows using any number of three-phase heating zones with post-phase and phase-controlled power control, which makes it possible, while maintaining high Glass quality vary by performance. 2 Il. cl

Description

with oo

00

(fue.l

This invention relates to the building materials industry, in particular to glass melting devices.

The purpose of the invention is to improve the quality and increase the productivity of the furnace.

Figure 1 shows the oven, a cross-section; figure 2 is the same, the view in the plan.

The three-phase electric glass melting furnace contains a cooking basin 1 with steps 2 forming

sub-electrode space 3. The power lines are pumped into the sub-electrode pool equipped with flat near-wall electrodes 4 connected to a three-phase power supply system having a regulator. Shurovka using power sources with alternating current 5 posonno and 6 phase in the zone. The cooking basin is connected by channels 7 and vertical channels 8 with working parts 9 and feeders 10 glass melts.

A three-phase electric glass furnace works as follows.

The mixture and bout are poured into the cooking pool, where they are melted using h electrodes, connected to the probe side of the electrode space and high

but to three-phase power sources 5 and single-phase 6. Molten glass melts into sub-electrode space 3, formed by steps 2, where it is homogenized, and further along the grooves 7 and vertical channels 8 it is fed to working parts 9, from where it goes through feeders 10 to production

The steps 2 of the cooking basin 1 form the sub-electrode space 3, whose width (1) is 0.2-0.5 distances (L) between the near-wall electrodes, and the height of the step h can be equal to or greater than the height of the electrodes (h) pool, which provides the best picture of the distribution of power lines in the pool and the uniformity of thermal fields below the zone of action of the electrodes. The ratio of the sizes of the cooking basin is determined by physical modeling.

The under-electrode space 3, formed by steps 2, in the selected size range, is protected from the action of a force electric field, so the potential below the plates drops sharply and the heat release

Due to electric heating, it does not occur, thereby achieving a uniform lowering of the glass mass, its averaging and an improvement in quality. This ratio of the width of the sub-electrode space and the distance between the wall electrodes provides the best picture of the distribution of the power lines in the pool and the uniformity of the thermal fields below the zone of action of the electrodes. An increase in the width of the sub-electrode space O, 5L leads to penetration

0

five

space, the reduction of the calm glass area and the flow of glass with different thermal past, which affects the homogeneity of the glass.

Reducing the width of the sub-electrode space; 0,2L, despite the absence of power lines in the sub-electrode zone, and consequently, heat generation leads to increased speeds of movement of the glass melt, increased wear of the refractory material and deterioration of the glass melt.

Permissible sectional area under5

0

five

five

0

These steps are directly dependent on the furnace performance and are calculated based on the temperature gradient from the clarification zone to the ducts. Steps under the electrodes increase the resistance of the bath R К where K is the coefficient forO

we are a basin, the change of which depends on the width of the sub-electrode space; J) is the resistivity of the glass; L is the distance between wall electrodes; S is the total working section of the bath in the interelectrode space. Reducing the current load also improves glass quality.

Connecting adjacent pairs of electrodes belonging to different zones to the feed phase of the same name makes it possible to also vary the resistance of the bath by changing the distance between the electrodes of the zones (B) within 0.5-1.0 times the distance between the electrodes of the pairs (a) in the zone . Reducing the distance between the electrodes of the zones compared to the distance between the electrodes of the pairs (0.5a) leads to

local overheating of the glass melt, and an increase (in 1.0A) - to local supercooling. Connecting the electrodes to opposite phases enhances the mutual influence of the zones and reduces the possibility of self-regulation.

In this furnace design, it is possible to use virtually any number of three-phase heating zones with post-phase and phase-phase power control. This makes it possible to significantly improve the performance of the furnace.

Thus, the knowledge of the zones that are at different distances between each other at all possible phasing of adjacent electrode pairs can be achieved by using a certain connection of electrodes, to ensure the uniformity of thermal fields horizontally, the possibility of controlling each electrode pair for any number of three-phase equipments - heating, and therefore, with any necessary input power. The step-by-step cooking basin with the selected dimensions of the sub-electrode zone ensures averaging of the glass melt prior to its selection into the duct, which ensures obtaining high quality glass and increasing the productivity of the glass melting furnace.

Claims (1)

Invention Formula A three-phase electric glass melting furnace, including a rectangular brewhouse with wall electrodes connected with phase-to-power control to the power supply system, in order to improve the quality of the glass and increase the productivity of the furnace, the brewhouse made stepwise, the width of the sub-electrode zone is 0.2-0.5 distances between the near-wall electrodes, its depth is greater than or equal to the height of the electrodes, and the adjacent pairs of electrodes of the adjacent three-phase heating zones are connected to phases of the same name, the distance between the electrodes of the adjacent zones being 0.5 - 1.0, the distance between the electrodes c. single zone. five 3, 9 Figg