SU1672180A1 - Tunnel oven - Google Patents

Abstract

The invention relates to equipment for the heat treatment of ceramic products, such as household porcelain, can be used in the manufacture of building ceramics and is aimed at improving the quality of products. The furnace contains the working channel 1, the inter-channel channel 5 with the lower 6 and the upper 7 arches of the working channel and the conveyor 8. The inter-channel channel 5 is equipped with fuel-burning means 10 and supplying diluent nozzles 11 located in the walls of the channel or in the upper arch. The lower dome 6 of channel 5 is made with transverse slots in which guide elements 12 are installed with gas ducts inclined at an angle to the lower dome. 2 Il.

Description

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The invention relates to equipment for the heat treatment of ceramic products, such as household porcelain, and can be used in the manufacture of building ceramics.

The purpose of the invention is quality improvement.

Figure 1 shows a furnace, a longitudinal section; FIG. 2 shows the node I in FIG. one.

The tunnel kiln contains a working channel 1 with zones of heating 2, firing 3 and cooling A of ceramic products, an inter-channel channel 5 with the lower 6 and upper 7 arches of the working channel and a conveyor 8 carrying heat-treating products 9 and representing a train of individual trolleys. The inter-channel channel 5 is located above the burning zone 3 and is equipped with a fuel-burning agent 10 (one or several) and combustion supply dilution nozzles 11 located in the channel walls or in the upper arch (lateral placement of the nozzles 11 is shown).

The lower dome 6 is made with transverse slots in which guide elements 12 are installed for directing the flow of fuel combustion products, equipped with gas ducts 13 inclined at an angle to the lower arch (Fig. 2). The ducts 13 can have a different cross sectional configuration, determined theoretically or experimentally, and can be equipped with special flow swirlers.

Each nozzle 11 interacts with one or several elements 12. The location of each guide element 12 on the lower roof 6. The feed gas / air mixture with certain parameters corresponds to the temperature and medium created in this area. In the inter-arbor channel 5 one or more nozzles 11 can be placed, the number of which depends on the parameters of the heating medium in the working channel of the furnace.

The furnace works as follows.

The conveyor 8 enters the heat treatable products 9, first in the heating zone 2, and then in the burning zone 3 of the working channel 1 of the furnace. Moving through these zones, the products are heated by the heat of combustion products, the streams of which, mixed with diluent, are dispersed and injected through the ducts 13 of the guide elements 12 from the interstage channel 5 to the working channel 1 towards the products, wash them and go to the smoke extraction system.

The combustion of the fuel is carried out by means of the fuel-burning means 10 installed in the inter-arbor channel 5. At the same time, into the combustion products of the fuel in

through the inter-channel channel 5, a diluent is introduced through the nozzles 11, which in a limited volume in the operation zone of each nozzle creates a gas-air mixture

temperature and environment. The diluent can be secondary air, which dilutes a limited volume of products to the desired temperature, or a reducing gas (oxidizer), which creates the required composition of the gaseous medium in the limited volume of combustion products.

The diluted mixture is partially introduced into the downstream direction guide element 12 for directing the flow of the mixture into working channel 1, is partially moved along channel 5 further and is corrected for temperature parameters or the composition of the gaseous medium by the action of the next nozzle.

0Heated to a predetermined temperature in

The firing zone 3 is brought out to the cooling zone 4, where they are cooled in cold air streams by means of a flow-exhaust ventilation system (not shown 5). After cooling, the heat-treated products are removed from the working channel 1 of the furnace, and the empty conveyor carriages are transferred to the entrance to the working channel for the load and heat-treating cycle of the products.

0 is repeated.

Thus, in the proposed tunnel kiln, favorable conditions have been created for improving the quality of heat treatment of ceramic products with

5 by automatically controlling the heat treatment process by preliminarily mixing combustion products with a portion of the diluent in a limited volume of the zone of action of each nozzle 11 to specific parameters and pushing this volume through the flue ducts 13 of the elements 12 into the working channel 1, creating in each particular place The firing zones of the working channel 1 of the furnace are optimal for heat treatment of products.

Elements 12 of the flow direction can be equipped with temperature sensors and the composition of the gaseous medium passing through them flow (sensors not shown), controlling the flow parameters at each point of their entry into the working channel, while the fuel-burning means is separated outside the working channel of the furnace and not affected This mode is automatically created in it.

Claims (1)

5 claims Tunnel furnace for heat treatment of ceramic products, containing ZONU heating, roasting and cooling, the upper and lower arches with an opening in the lower arch, the burner located in The inter-arbor channel, characterized in that, in order to improve the quality, it is provided with guiding elements placed in the openings of the lower arch with ducts inclined towards the 5th channel. / 3 movement of ideli. and supply nozzles of the diluent of combustion products placed in the inter-arterial channel, and the burner device is located in the end of the inter-articulated duct 1