SU962734A1 - Unit for producing expanded material - Google Patents

Description

The invention relates to the building materials industry and can be used in the production of expanded materials, for example, expanded clay. .

Known apparatus for producing meltblown materials, comprising a closed-circuit ⁵ .bannuyu rotary kiln with a burner mounted at the discharge end of the kiln at its center, for loading and unloading device * material, and systems po- ₁₀ cottages and selection coolant ^ 1}.

The closest in technical essence to the proposed one is a plant for the production of expanded materials, containing a rotary drum furnace 15 with a burner and a pipe for supplying flue gases installed in the discharge end of the furnace, and a fan for sampling the exhaust flue gases, and the heat pump is installed in the center of the furnace and the pipe ²⁰ ba ~ flue gas supply is connected to the external combustion chamber C 2} installed outside the furnace.

A disadvantage of the known installations is the large volumetric weight of the obtained material due to the impossibility of accurately adjusting the temperature in the furnace to the expansion zone, as well as the high heat consumption.

The purpose of the invention is to reduce heat consumption and reduce the bulk density of the obtained material.

This goal is achieved by the fact that the installation for the production of expanded material, containing a rotary drum furnace with a burner and a pipe for supplying flue gases installed in its discharge end, an exhaust gas extraction fan is equipped with additional burners, and a pipe for supplying flue gases is installed along the axis of the furnace and connected to the exhaust gas extraction fan, while the burners are located around the pipe at an angle of 1-45 ° to its surface.

982734

In addition, it is advisable to carry out the pipe with perforation in the zone of the torches of the burners, and to suck the ambient air, the installation should be equipped with a gate installed in front of the exhaust gas extraction fan.

In FIG. I shows the installation diagram; in FIG. 2 - temperature curve of the furnace; in FIG. 3 - pipe for supplying flue gases with burners. 10

The installation comprises a rotary drum furnace 1, a heat exchanger 2, a discharge device 3, fans 4 and 5, a gate 6, a pipe 7 for supplying exhaust flue gases to the 15 furnace, burners 8 installed around the pipe at an angle of 1-45 to its surface, centrifugal a blade flow swirler 9 located inside the pipe 7, as well as the gate 10 of the air suction. Perforation is made at the 20 outlet end of the pipe in the torch torch zone. When installing burners under an angle less than I in relation to the surface of the pipe, the combustion torches directly affect the 25 flue gas pipe, which leads to its overheating and premature failure. When the burners are installed at an angle greater than 45 ° relative to the pipe surface, the burning torches directly affect the furnace lining and the material being burned, which leads to local overheating and premature failure of the lining and the formation of cakes of the material. The fan 4 serves to select the exhaust flue gases from the heat exchanger 2 and supply them to the pipe 7, and the fan 5 to release the exhaust flue gases into the atmosphere.

Installation works as follows.

The flue gases enter the heat exchanger 2, where it passes through the layer of raw pellets ₄₅ are cooled and cleaned of dust schayutsya. Then 15-85% of the exhaust flue gases by the fan 4 are fed into the pipe 7, and the remaining flue gases are emitted into the atmosphere or into the pellet pre-drying drum. The flue gases fed in ^labor-50 bu 7, 9 and twist swirler tostupayut in an oven for torch burners 8. Due to swirl the exhaust flue gases is their mixing with the combustion products of burners 8, in which the results ⁵⁵ Tate temperature of the gas mixture is reduced in proportion and flue gas temperature.

The presence of perforation on the pipe 7 prevents direct exposure of torches to the torches on it, since the exhaust flue gases bursting out of the holes, “from -. press torches from the pipe 7.

By changing the amount and temperature of the exhaust flue gases, as well as their composition, due to the suction of air through the gate 10, it is possible to change the form of the temperature curve in the furnace and the composition of the gas medium of the furnace and, due to this, create optimal conditions for each type of raw material ^ for minimal burnout of organic substances material before it enters the expansion zone, which allows to obtain expanded material with a minimum bulk density and reduce the specific heat consumption for firing.

Oxygen in the amount necessary for oxidation reactions to occur in the material enters the expansion zone of the furnace from burners with air, provided that fuel is burned with excess air, or is sucked into the furnace from its discharge end, and the creation of optimal conditions for expansion of the material is ensured by additional autonomous regulation of each burners.

The proposed installation provides for temperature control in the furnace, which allows to create the optimal thermal regime and, therefore, to ensure the production of expanded material with a minimum bulk weight.

The use of exhaust flue gases in the furnace reduces the heat consumption for firing, since there is no need for an additional combustion chamber.

Claims (2)

1.Onatsky S.P. Production of expanded clay. M., stroiizdat, 1971, p. 156. 2.Avtosskoe certificate of the USSR No. 4p1874, cl. R27 B 7/36, 1970 (prototype). -Fig .1 g air struggling