SU775582A1 - Method of burning claydite and device for effecting same - Google Patents

Description

This invention relates to prod. lightweight aggregates of concrete, specifically for the firing of expanded clay. Methods are known for the thermal treatment of karamzite raw materials that allow control of the operating mode of the enemy furnaces. The closest technical solution is the method of burning lightweight aggregates, for example, expanded clay in rotary kilns by heating with a torch and feeding a stream of secondary air into the furnace room at ambient temperature 3. These methods have the following non-; prosperity: the difficulty of regulating the regime of gout; . the difficulty of creating an air curtain over the material, the impossibility of ensuring its uniform distribution over the surface of the layer of material; roasting is carried out in an oxidizing environment, which has a negative effect on the coefficient of expansion of expanded clay. The purpose of the invention is to increase the coefficient of expansion. haydite, reducing specific fuel consumption and electrical energy. This goal is achieved by the method of roasting claydite in a rotary kiln with zones of drying, heating, swelling and cooling, which includes processing ceramsite raw materials with combustion products with supply of primary and secondary air, the flow of primary air is fed into the zone of swelling with an air flow rate d-0 , 6-0,75, and the secondary air flow, bringing the coefficient of air flow to oi. L, 05-l, 09 for the after-burning of combustible components (CO, Hj, etc.), are introduced into the heating zone of the raw material. Such a method can be implemented in a device of a new design, containing a rotary kiln, a loading and unloading device, a nozzle installed on the discharge end side, and an annular collector, with the annular collector installed inside the furnace at a distance of 3.5 4, 5 of the furnace diameter. the unloading mountaineer and is equipped with ellumination blades located at an angle of 4045 relative to the cross-sectional plane of the furnace. .

FIG. 1 shows a device for the existence of the proposed method, a rhodol section; in fig. 2 - remote element ring collector; on. ig. 3 section AA on fig. 2

The device consists of a rotary kiln 1, a burner 2, a loading and unloading device 3 and 4, respectively, an annular manifold 5 embedded on the inner side of the furnace body 1, communicating with the external environment of the vertical 6, and with an oven medium - interscale areas TcciMH 7. equipped with ellumination blades 8.

The device works as follows.

The primary air is fed through the gas burner 2 along with the fuel into the expansion zone, and the secondary air through the holes 6, the manifold .5, the interscapular spaces 7 enters the furnace into the heating zone due to the vacuum generated by the exhaust fan. The amount of secondary air is controlled by a gate located in front of the exhauster. The annular collector is located at a distance of 3.5 - 4.5 diameters from the discharge end of the furnace, where the temperature reaches 750 -.

The angle of inclination of the ellumination blades, directed against the rotation of the furnace, was chosen, based on the following considerations:

a) the angle can be structurally changed from 0 to 90. At 0 °, the air path of the device is completely closed, at 90 it opens completely, and the air flow will be directed towards the movement of products of incomplete primary combustion of fuel. This circumstance impedes the entry of air into the furnace, intensifies its mixing with hot components and leads to an increase in temperature: over 75.0 - due to their burning out by the inner surface of the collector, which adversely reflects on its service life, thus there is a likelihood of material particles to the collector; .

b) with a decrease in the angle of inclination of the elluminative blades from 90, directed against the rotation of the furnace, the air enters the furnace in a swirling flow.

elongation of the mixture with the primary combustion products of the fuel, at. this improves the cooling condition of the collector.

However, as the angle decreases, the hydraulic resistance of the air path increases. An intensive increase in the hydraulic drag coefficient is observed at an angle of 40-45 °.

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Claims (3)

1. The method of burning claydite in a rotary kiln with zones of drying, heating, swelling and cooling, including the processing of claydite raw materials with combustion products with the supply of primary and secondary air, about 1/2. h: .and y and so that, in order to increase the coefficient of expansion of expanded clay, reduce specific fuel consumption and electrical energy, the flow of primary air is supplied to the zone of swelling with a coefficient of discharge in a spirit of 6-0.75 air, bringing the coefficient of air consumption to, 05-1.09 for the after-burning of combustible components (CO, H2I, etc.), are introduced into the heating zone of the raw material. 2. A device for carrying out the method of Claim 1, comprising a rotary kiln, a loading and unloading device, a burner installed on the discharge end side, and an annular collector, different in that the annular collector is installed within the furnace 3.5 - 4.5 diameter of the furnace from the discharge end. 3. A device for carrying out the method according to claim 2, characterized in that the annular collector is provided elluminative blades located at an angle of 40-45 relative to the cross-sectional plane of the furnace. Sources of information, .. 45 taken into account in the examination 1. The patent of Germany No. 1250601, cl. 31a 1 - 7/38, 1968. 2. German Patent No. 1914491, cl. 80b, 18/03, 1968.. 3. Authors certificate of the USSR 544635, cl. C 04 V 31/20, 1975 material Natvria i (3, f-, S) Sa 03ut.3