SU1395921A1 - Rotary furnace - Google Patents

Abstract

The invention relates to rotating heat aggregates, preferably for the manufacture of lightweight aggregates. The aim of the invention is to intensify the cooling and increase the efficiency of the furnace. The rotary kiln includes drying, firing and cooling zones. A distinctive feature of the furnace is the presence in the cooling zone of the device for cooling the material. The device contains longitudinal partitions 3 with chambers 5 with perforated walls 6 placed in their cavity. The chambers provide for the supply and discharge of cooling air, which then goes to the furnace for combustion. 4 il .. (O oo coel; o 1C

Description

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The invention relates to rotatable heat aggregates of a predominantly continuous type for the manufacture of lightweight aggregates, such as ash and slag, used in the building materials industry.

The aim of the invention is to intensify the cooling of the material and increase the efficiency of the furnace.

Fig. 1 shows a rotary kiln with a material cooling device, a general view; in fig. 2 is a section A-A in FIG. on the firm. 3 - section BB in FIG. 2 in FIG. A, section B-B in FIG. 2,

I Rotating furnace 1 includes a device 2 for cooling the material installed in the furnace.

The device is formed by longitudinal I partitions attached to the furnace body 1, which divide the working space I of the furnace into cells 4 for the first pass of the material and combustion products I.

The longitudinal partitions 3 have inside air distribution chambers 5 with perforated walls 6 and located along the walls of the longitudinal partitions 3. Inside the air distribution chambers, an air supply channel 7 passes. - They are inserted through gaps 9 formed by the I side surfaces perforated by I walls 6 and the side surfaces of the longitudinal partitions 3.: For cooling the material, the air flows through cial channel 10 connected to the conductive vozdukopodvod backbone and present supply conduit 11 and the heated air exits through discharge nozzles 12 and the conductive outer

annular exhaust duct 1

A rotary kiln with a device for cooling the material works as follows.

The material passes successively through the zones of drying, swelling and cooling, and in the cooling zone enters the device 2 d, the cooling plate. Before entering the device 2, the material fills a part of the furnace section with one layer, and when it enters the cooling device 2, the layer is divided and evenly distributed

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along the surface of the cells A and when the furnace rotates, it moves along the working walls of the longitudinal partitions 3 (heat-receiving surfaces) of the device 2. This increases the surface of direct contact of the material with the walls of the partitions. In the closed cavity of cell 4, the material and combustion products cooled and transferred their heat to the walls of the partitions. Cold air through the air supply channel 10, the pipe 11 and the air supply channel 7 through the perforated walls 6 is fed into the chambers 5 of the first section of the cooling device and, at an angle of 90, flows onto the working walls of the longitudinal partitions 3, selects the transferred heat from the material and products of combustion, is heated and, moving along them to the periphery of chambers 5, passes through the gaps 9, the outlet nozzles 12 and the air duct 8 to the next section of the cooling device.

The number of sections of the device 2 for cooling the material is selected depending on the required heat exchanging surface, which is determined by calculation.

The design of the device for cooling the material, which separates the cavity of the rotary kiln into cells, increases the surface of direct contact of the material and combustion products with the working (heat absorbing) surface of the cooling device, and also reduces the thickness of the material layer. A decrease in the thickness of the layer of material together with an increase in its surface on the working walls of the device causes a decrease in the temperature gradient along the thickness of the layer, which contributes to a more uniform cooling of the material. The jet discharge through the perforated walls ensures maximum heat removal from the working (heat-receiving) walls of each chamber. At the same time, within the cells, the combustion products are constantly in contact with the two sides of the heat-receiving surface, and the material, as it moves, contacts first with one and then with the other side of the heat-receiving surface of the longitudinal partitions.

Thus, the design provides uniform, deep cooling .139592

The material is consumed for the duration of combustion and the subsequent use of their heat by blown air, which enters the burner as the primary device, which increases the efficiency of the furnace and reduces the specific fuel consumption for production.

Claims (1)

Claims. Iq A rotary kiln primarily for the manufacture of a lightweight filler, comprising a rotating cylindrical body, pa & divided by cells and ig one the central channel with the help of longitudinal partitions with an air passage channel in each of them, communicating with the central channel, is so necessary that, in order to intensify the cooling of the material and to increase the efficiency of the furnace, the longitudinal partitions are provided with air distributors chambers with perforated walls located along the walls of the longitudinal partitions, and the central channel is connected to the air duct. / 7pff fi rrfir / ciapanu 12 / f arrre licf / 7