RU2242436C2 - Method for batch preparation - Google Patents

Abstract

FIELD: glass industry, in particular glass melting in bath-type furnace.

SUBSTANCE: claimed method of batch preparation includes batch charging and heat treatment on oblique walls, wherein batch is lubricated and grained before charging. Before lubrication batch components are heated to 50-60⁰C. Lubrication is carried out by using water of t = 60-70⁰C (e.g. in mixer) up to humidity of 4-5 %; graining is carried out in screw pelletizer. Heat treatment is carried out at 820-830⁰C on oblique walls with controlled angle of slope. Additionally for heat treatment electrically heated device with controlled input batch temperature is used. Method affords the ability to increase power efficiency of straight-line furnace by 1.5-2 times (in particular not less than by 20-30 %).

EFFECT: improved area efficiency of fluid class and reduced emitted dust.

1 dwg, 1 tbl

Description

The invention relates to the glass industry, in particular to the cooking of glass in bath furnaces.

There are various methods of preparing the mixture before it enters the glass melting furnace.

So, the preparation of the mixture, implemented in glass melting in a direct heating furnace, involves feeding the mixture through a chimney, where it undergoes heat treatment and is poured into the furnace through a riser [1].

The disadvantages of this invention is the temperature regime of heat treatment of the mixture, leading to a low reaction rate of silicate formation, as well as high dust and the possibility of stagnation of the agglomerate of the mixture when it is heated.

Closest to the invention in technical essence and the achieved result is a method of preparing the mixture, implemented in the device for loading the mixture [2].

The disadvantage of this solution is the low gas permeability of the mixture entering in the form of a melt in the furnace, which can lead to deterioration of the quality of the glass melt.

The problem to be solved is increasing the productivity of the furnace, reducing energy consumption and dust extraction. To do this, in the method of preparing the mixture, including feeding the mixture, its heat treatment on inclined partitions, mix the mixture before feeding, moisten and granulate, and before mixing the components of the mixture are preheated to 50-60 ° C, humidification is carried out with water with t = 60-70 ° C, for example, in a mixer until 4-5% humidity is reached, granulation is carried out in a screw granulator, and heat treatment is carried out at 820-830 ° C on inclined partitions with a mechanism for adjusting the angle of inclination, while for heat treatment an additional slide with electric ktropodogrevom, which control the inlet temperature of the charge.

The essence of the invention lies in the fact that the mixture before it is fed into the shaft chimney for heat treatment passes through several stages of preparation for glass melting; Thus, the charge components preheated to 50-60 ° С are mixed in a mixer, where the resulting mixture is moistened with water at a temperature of 60-70 ° С until 4-5% humidity is reached and granulated in a screw granulator, which prevents the mixture from sticking together and ensures its higher thermal conductivity, then the charge is fed to the inclined partitions, where it is subjected to heat treatment at a temperature of 820-830 ° C with flue gases, while due to the interaction of water vapor with soda, caustic soda is formed, which accelerates the reaction of silicate formation. Inclined partitions made with a mechanism for adjusting the angle of inclination provide the desired speed of advancement of the charge and its heating to reach the heat treatment temperature. On the slide with electric heating, partially placed in the furnace, the initial stage of formation of molten glass melt in a thin layer from the charge takes place: silicate formation, glass formation and lightening, while the intensity of the glass melting process increases.

A comparison of the proposed and known solutions gives reason to believe that the proposed technical solution meets the criteria of novelty, inventive step and industrial applicability.

The drawing schematically shows a device on which the inventive method for preparing the charge is implemented, where after the mixer (not shown in the drawing): screw granulator (1), bucket elevator (2), loading hopper (3), loader (4), shaft chimney (5), inclined partitions with an angle adjustment mechanism (10) installed in the chimney (5), electrically heated slide (6) with a temperature sensor (8), a camera sensor (9) installed in the chimney (5), bathroom furnace (7), cyclone (11), recuperator (12).

The claimed method is implemented as follows: the mixture components heated to 50-60 ° C are mixed and moistened with hot water with t = 60-70 ° C until a moisture content of 4-5% is reached, for example, in a mixer, then granulated in a screw granulator (1), the bucket elevator (2) is fed into the loading hopper and the loader (4) the mixture is evenly distributed on the upper partition (10) in the shaft chimney (5). The angle of inclination of the partitions is adjusted so that the mixture warms up no more than 820-830 ° C. The maximum heat treatment temperature for each charge composition is selected so as to prevent premature formation of a liquid phase on inclined partitions (10). The interaction of water vapor with soda in a mine chimney leads to the formation of caustic soda NaOH, which accelerates the reaction of silicate formation. When making holes in the partitions, you can further increase the heat transfer surface. After the inclined partitions (10), the charge falls on a slide with electric heating, where the ability to control the temperature with the sensor (8), visual control by the sensor (9) over the state of the charge allow the heating to be regulated and provide the necessary heat-perceptible surface of the charge and its melt. From the hill (6), the melt flows into the cooking pool of the furnace (7). Flue gases after the mine chimney (5), passing through the charge, enter the cyclone (11) and are sent to the recuperator (12) to heat the gas and air, and the dust particles deposited in the cyclone are poured into the hopper (3).

Implemented by the proposed method, the process of preparing the mixture allows to increase the efficiency of once-through furnaces. So, according to the data obtained, the energy efficiency of the compacted charge is confirmed by the following comparative values:

The specific heat consumption for the melting of 1 ton of glass in existing once-through furnaces is about 4000 kcal / kg, which is 1.5-2 times higher than the best indicators of domestic plants, and the thermal efficiency of once-through furnaces does not exceed 17%.

These comparisons allow us to conclude that the proposed method can increase the thermal efficiency of once-through furnaces by about 1.5-2 times, or rather not less than 20-30%, while the specific removals of glass melt are improved and dust removal is reduced.

Sources of information

1. Copyright certificate 1127852, cl. C 03 V 3/02, publ. 12/07/84, bull. No. 45.

2. Copyright certificate 289976, cl. C 03 V 3/02, publ. 12/22/70, bull. No 2 for 1971

Claims (1)

The method of preparation of the charge, including the supply of the charge, its heat treatment on inclined partitions, characterized in that the charge is moistened and granulated before being fed, the components of the charge are preheated to 50-60 ° C before being wetted, humidification is carried out with water from t = 60-70 ° C, for example, in a mixer until 4-5% humidity is reached, granulation is carried out in a screw granulator, and heat treatment is carried out at 820-830 ° C on inclined partitions with a mechanism for adjusting the angle of inclination, while an electric feed slide is also used for heat treatment heating, at the entrance of which control the temperature of the mixture.