SU1350458A1 - Double-drum furnace for producing keramzit - Google Patents

Abstract

The invention relates to rotary kiln designs and can be used in the building materials industry in the production of porous aggregates, in particular, in the kiln of expanded clay gravel. The purpose of the invention is to reduce the bulk density of the aggregate and increase the productivity of the furnace. For this, the loading device 3 is placed on the casing of the firing drum 4 before the swelling zone in the course of the material's motion at a distance from the hot end equal to 0.2-0.4 of the firing drum length, and filled in the form of nozzles placed around the firing drum casing , with a total area equal to 0.05-0.2 square limited ring surface of the drum. In the process of operation of the furnace raw pellets come from the ba-. The preliminary heat treatment slave 1 is fed into the pouring chamber 2 and through the loading device 3 with nozzles, the material is fed into the firing drum 4 in front of the expansion zone, where it expands intensively and with a temperature of 1100-1200 ° C enters the solidification zone. Then the material is discharged into the refrigerator. The proposed furnace design allows us to carry on: the process of burning keramzite gravel in the optimal step mode, using the potential of the clay raw material to swell. 2 з.п, ф-л, 2 Il. (L 00 pr sd sd 00

Description

The invention relates to rotary kiln designs and can be used in the building materials industry in the production of porous aggregates, in particular, in the kiln of expanded clay gravel.

The aim of the invention is to reduce the bulk density of the aggregate and increase the productivity of the furnace.

Fig, 1 shows a two-bar, bath furnace, longitudinal section; FIG. 2 is a section A-A in FIG. 1,

The double-drum furnace contains a drum 1. a preliminary thermal sub-g in a refrigerator (not shown), cooking, a pouring chamber 2 with a fixed structure. The proposed design with a double load device 3 and the drum 4 of the slab kiln allows for conducting an optical roasting. The loading device 3 is placed on the casing of the firing drum 4 in front of the heaving zone in the course of the material movement.

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It is possible to burn ceramsite gravel in a stepwise mode, ensuring that the potential of the clay raw material is used for bulging, while the bulk density of the clay is reduced by 1–2 marks, and the furnace productivity increases by 25 seconds by 20–25%,

The loading device is installed H9 distance from the hot end equal to 0.2-0.4 firing drum lengths, and is made in the form of nozzles 5 located around the circumference of the ba-raban firing body, while the total area of the nozzles is 0.05 - 0.2 square limited ring surface of the drum.

The beginning of the area of the swelling zone at the movement of the material is located at a distance of 05.3 firing drum lengths from the hot end. When the expanded clay is fired, depending on the aerodynamic factors, the design of the fuel-burning devices and others, the swelling area can be displaced 2 6 m. With this in mind, the loading device is placed in front of the puff zone at a distance equal to 0.2-0.4 of the length of the firing drum from its hot end.

Double-drum oven works as follows.

Raw granules are metered into the drum 1 of preliminary thermal preparation, where they are successively dried and heated to 400 ° C with flue gases from the roasting drum 4. The heated semi-finished product from the pouring chamber 2 through the pipes 5 of the loading device 3 serves

inside the firing drum 4 in front of the expansion zone. When the furnace rotates, the semi-finished product by flow in the filling chamber 2 is poured through the nozzles into the drum and almost immediately into the expansion zone. When heated at a rate of deg / min, the temperature of the granules almost immediately reaches 1100-1200 0 and their intensive swelling occurs. From the swelling zone, ceramsite gravel enters the solidification zone and then with the temperature around it is discharged

in the refrigerator (not shown), the proposed design of a two-sided furnace allows for optimal

It is possible to burn ceramsite gravel in a stepwise mode, ensuring that the potential of the clay raw material is used to swell, while the bulk density of the expanded clay decreases by 1–2 marks, and the capacity of the furnace increases by 20–25%,

Claims (1)

Invention Formula 0 five 0 five 0 1, Double drum furnace for the production of expanded clay, containing a preliminary thermal preparation drum, a pouring chamber with a loading device and a firing drum, characterized in that, in order to reduce the bulk density of the aggregate and increase the productivity of the furnace, the loading device is placed on the firing drum body in front of the expansion zone in the course of the movement of the material 2, Furnace in accordance with clause 1, i.e. tl and h and with the fact that the loading device is located at a distance from the hot end equal to 0.2-0.4 of the length of the firing drum, 3, The furnace of PP, 1 and 2, that is, that the loading device is made in the form of branch pipes installed around the circumference of the drum casing, the total area of which is 0.05-0.2 of the area of the annular surface limited by them the drum. Compiled by S.Prkova Editor N.Gunko Tehred M.Hodanich Proofreader A.T. Order 5248/38 Circulation 543Subscription VNIIPI USSR State Committee Inventions and discoveries 113035, Moscow, 1-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4