SU1004270A1 - Method for melting glass - Google Patents

Description

(54) METHOD OF WELDING GLASS

The invention relates to the production of building materials, in particular, to methods for melting glass in continuous furnaces.

There is a known method of heating a glass furnace furnace with a transverse direction of a flame, in which the maximum thermal loads are set on the third or fourth pair of burners, and the ratio of thermal loads at the beginning and at the end of the charge zone is set at 0.550, 62 si.

A disadvantage of the known method of glass melting is the impossibility of using it in glass-melting furnaces with an additional electric heating (SDP) of glass mass and a low temperature level in the weld zone of the charge.

The closest to the proposed technical essence and achieved, my result is a method of melting glass in a regenerative bath of a glass melting furnace with a transverse direction of a flame with DEP systems of glass melt in the charge zone and a quartz point and melt glass mass with a compressed gaseous agent 1.2.

The disadvantage of this method is its limited capabilities. As regards the supply of heat from the fiery space of the furnace to the cooking zone, mainly, this means. The fact that bubbling nozzles are located in furnace sections is not characterized by maximum thermal radiation from the fiery space. This reduces the intensity of heat exchange in the zone of turbulence (through thermal windows formed in the charge layer due to the operation of the steam nozzles) and reduces the efficiency of using the cooking area of the furnace as a whole - as a result, the furnace performance decreases and the quality of the glass melt deteriorates.

The purpose of the invention is to increase productivity, improve the quality of glass melt and extend the kiln campaign;

The goal is achieved by the method of glass melting in a regenerative bath furnace with the cross direction of the flame through burner vapors, additional electric heating in the charge and quillpoint zones and glass melt drilling, and the maximum heat loads are created in the charge zone on the second pair of burners , while the ratio of heat loads on the first and second pairs of burners is set to 0.7-0.8, and the ratio of the power of additional electric heating in the charge and quelkund areas is 0.15-0.45. In a regenerative bath of a glass melting furnace, the maximum heat load is usually set on 3-4 pairs of burners. But when used along with the gas-flame heating of the glass-mast DEP, such an arrangement of maximum heat loads leads to overheating of the furnace roof and prevents the normal development of the convection glass-glass mass from the DEP system in the quest point in the direction of the charge zone — at the same time a significant amount of heat is supplied to penetration of the charge from the bottom. By setting the maximum thermal loads in the charge zone on the second pair of burners with simultaneous intense boiling of the glass mass in this zone, the maximum heat release in the region of thermal windows formed by gas flows ascending from the nozzles is provided. Thus, heat transfer in the melt volume is intensified and the charging process is accelerated from below (due to the increase in the temperature of the melt under the charge). Such distribution of heat load allows reducing the length of the cooking foam zone and intensifying the cooking process. due to the predominant supply of heat to the area of intense turbulence of glass mass. At the same time, there are such positive technological effects as intensive loosening of the charge mixture, an increase in the heat-receiving surface of the charge, and improvement of the conditions for the flow of the film of freshly welded glass melt with the charge mixture. Under the conditions of the gas-flame heating of the furnace with the DEP systems of glass melt installed in the charge zones and the fire station, conditions are created to increase the speed of the charge mixture towards the working part, which can lead to incomplete charge and the appearance of the midges. Transferring the maximum heat loads to the second pair of burners prevents this by increasing the average level of temperatures in the glass mass, which accelerates the boil down of the charge, improves quality from: melt mass and intensifies the bulk convection flow of the glass masses; In addition, transferring the maximum thermal loads to the second pair of burners reduces the temperature at the furnace roof in the cooking zone and provides the possibility of further improving the furnace performance. At the same time, prerequisites are created for extending the working campaign of the furnace. The method is carried out as follows. In a regenerative glass furnace furnace, using symmetrically arranged burner pairs, the following are used: flame-flame heating of the charge and molten glass melt. With the help of DEP systems of glass melt located in the charge zone and the quill-point, the glass melt is additionally heated. In the zone between the electrode groups of the DEP and CEREZ systems, mounted in the bottom of the basin, the glass melt is boiled. The maximum thermal load DK is set in the charge zone on the second pair of burners. The correlation of heat load in the zone of the first and two pairs of burners is set equally; lm 0.7-0.8; The ratio of the power of the DEP systems of glass melt in the zone of the charge: l and qelpunkte set equal to 0.15-0.45. Example. On a regenerative bath of a glass-melting furnace of a sheet glass, heated by six containers of gas burners, was tested on a glass cooking system. The electrodes of the systems, glass mass pn are installed through the refractory masonry of the bottom of the cooking furnace of the furnace in the area of the fire station (between 4 and 5 pairs of burners) and in ao-ie mixture (before the first pair burned eq). In the area of the cooking pool between the electrode groups, a complex of bubbling nozzles was mounted through the bottom to supply a compressed gaseous agent (nitrogen) to bubble the glass mass in the charge zone. Extreme nozzles (in the direction of development) are installed in the zone of the 2nd pair of burners. The test results and the comparison of the proposed method of melting glass with the known are given in Table 1. M

Famous. Proposed Testings show that setting the maximum heat loads in the charge zone on the second pair of burners with simultaneous intense boiling of the glass mass in this zone and additional electrical heating in the charge zone and the fire point provides a significant increase in the furnace performance (by 20%) and improving the quality of the glass melt with an increase in the output of grade I by 15%. At the same time, according to the technological assessments of new technology, the increase in the efficiency of the float glass line is: an increase in productivity in the order of 10-15% (relative) and an increase in the yield of glass 1 grade 15-20% (relative). When the ratio of heat loads in the zone of the first and second pairs of mount locks is less than 0.7, a decrease in the amount of heat supplied to vmxт is observed, which also affects the bottom thermocouple rate before the first pair of burners, which leads to a decrease in performance and degrades the quality of the glass melt. Increasing this ratio to more than 0.8 may cause excessive

1180

0.15 1200 0.39 1220 0.45 1250 Gas consumption for burners, | CEP 1, DEP 2, Output-Output% kW kW nyI Method Nt 1 rt% /% pick-up, 1 I 2 I 3 I 4 5 Known 17.9 20.1 22.5 24.5 15.0 - 0.90 2500 - 1700 81 Proposed 17.2 23.5 19.7 19.2 14.2 6.20 0.73 2500 750 2100 96 The test results of the proposed electric heating in the glass melting method depend on the charge ratio and the reduction point on the power ratio Tables 2. DEP 2 DEP 1 DEP 2 Donna Tei e Method (in the area of the mixes (in quatturing glass), kW), kW DEP 1 mass before Table 1 Tab. l and c a 2 with the first pair of burners, C but the heating rate of the heaps of the charge in the zone of their penetration is high, which may lead to the formation of cristobalite stone in the glass mass. In addition, this leads to severe wear of the granular wall and a decrease in the temperature gradient in the glass mass between the quill point and the boot pocket, which reduces the main driving force of the granular cycle. The temperature of the glass melt in the return flow of the bulk convection cycle is the most important parameter characterizing the proper organization of the glass melting process. Optimum furnace performance and glass melt quality are obtained by maintaining bottom thermocouples in the range of 1150 to 1200 ° C at the azan temperature. This temperature range corresponds to the ratio of the power of the DEP of glass melt in the charge zone and the quota point from 0.15 to 0.45. When this ratio is more than 0.45, an increase in the rate of passage of the charge mixture towards generation and a significant weakening of the granular cycle of convection currents takes place, which leads to a deterioration in the quality of glass.

Claims (1)

Claim A method of glass melting in a regenerative bath furnace by transverse flame control through a pair of burners, additional electric heating in the charge and quellpoint zones and glass melt drilling, characterized in that, in order to increase the furnace productivity, ³³ improve the quality of the glass mass and extend the furnace campaign, drilling is carried out and a maximum of thermal loads is created in the charge zone on the second pair of burners, while the ratio of thermal loads on the first and second pairs of burners is set to 0.7-0.8, and the power ratio is up to additional electric heating in the zones of the charge and kelpup45 kta 0.15-0.45.