SU606075A1 - Rotary furnace - Google Patents

Description

(54) ROTATING OVEN

otHoOWenbHO at the entrance of the nozzle at the places of their joints with the parts of the furnace drum around 5-180 ° C, and the ratio of the height of the output natpyOica and the height of the inlet nozzle of each t of the interchangeable pipe is from 1.1

until 3.

Wah FIG. 1 shows the proposed furnace with a partial hull, general view; in fig. 2, section A-A of FIG. one.

The rotary kiln contains cylindrical sections 1 and 2 of the furnace drum, which have a common axis of rotation and are interconnected by a rigid shaft 3 and heat exchange tubes 4, which perform; the role of Kala Inator. The total transverse area of the heat exchange tubes 4 is equal to the cross-sectional area of the furnace drum.

Heat exchange tubes 4 are connected to the qi / shndrykami sections 1 and 2 of the furnace drum input 5 and output 6 nozzles. The inlet pipe 5 of each heat exchange pipe 4 is offset relative to the outlet pipe 6 at the points of their connection with sections 1 and 2 of the furnace drum circumferentially by 5-180 °.

The height of the outlet pipe 6 exceeds the height of the inlet pipe 5 of each heat exchanging pipe & .I 1.1-3 times.

Heat exchanger tubes 4 and sections 1 and 2 of the furnace drum are lined with refractory material.

The furnace has two fuel burning zones. The main part is provided with a burner device 7 and a second burner is provided with burner devices 8 installed around the perimeter in the butt end of the furnace part.

Additional burnable devices 8 obech the combustion of fuel throughout the area of the material outlet from the outlet nozzles, creating a rise. neck temperature of heat carrier in the exchange tubes 4.

Such a constructive solution of the proposed device allows to adjust the time of material in the calcination zone, thus achieving almost half a decarbonization of the material in a short section without increasing the size of the furnace.

The furnace works as follows.

The material is fed into the cylindrical section 1 of the inaccurate drum from the cold end. From the opposite end of the furnace, the fuel mixture is supplied by means of a burner device 7.

An additional quantity of fuel is supplied directly to the calcining zone through the burners 8. The total amount of heat supplied by the two burners 7 and 8 does not exceed the calculated amount of heat required for calcining the material in a rotary kiln.

Due to the inclined position of the furnace and its rotation, the layer of material moves along the cyshndric section 1 of the furnace drum, and behind it wakes up through the inlet nozzles .5 into the hepatom tubes 4 and is distributed along them in a uniform layer.

Furnace gases move towards the material through heat exchange pipes 4, and the temperature of the heat transfer medium in the proposed device in the calcination zone will be significantly higher than in the same zone c. known rotary kilns due to the presence of a second combustion zone, which contributes to the active decarbonization of the material.

At the moment when the cylinder heat exchanger tube 4 is at the highest point of the material, due to the non-parallel position of e relative to the furnace axis and displacement of its inlet and outlet nozzles 5 and 6 relative to each other at an angle from 5 ° to 180 °, some time does not move along the longitudinal axis i.e. lingers on this jerk and undergoes intensive heat exchange with this

With the subsequent turning of the furnace, the material from the outlet pipes 6 of the heat exchange pipes 4 begins to spill into the cylindrical section 2 of the hot end of the furnace.

In this area, there is a sharp change in the direction of the gas flow due to its transition from the central part of the furnace drum 2 to the heat exchange pipes 4 and an intensive dust precipitation occurs.

In connection with this, the combustion of the fuel supplied by the burner devices 8 will occur in a heavily suspended suspended material medium, thereby increasing the heat transfer coefficient

Claims (2)

1. A rotary kiln for firing loose material, containing cylindrical sections of an oven drum, interconnected by heat exchange tubes through inlet and outlet nozzles, characterized in that, in order to increase the intensity of heat exchange and increase the removal of calcined material from the volume of the material furnace, the inlet pipe of each heat exchange pipe is offset relative to the outlet pipe at the places of their connection with parts of the furnace drum around the circumference of 5-180. 2. A rotary kiln according to claim 1, characterized in that the ratio of the height of the outlet pipe and the height of the inlet pipe of each heat exchange pipe is from 1.1 to 3. Sources of information taken into account in the examination: 1. Khodorov EI Cement industry kilns. Leningrad, 1968, p. 59. 2. USSR author's certificate number 31372, cl. F 27 B 7/04, 1930.