SU1202357A1 - Arrangement for feeding process dust and fuel into furnace - Google Patents

Description

The invention relates to a technique of heat treatment of materials in rotary kilns in the building materials industry, ferrous and non-ferrous metallurgy, in the chemical industry and concerns the design of devices for feeding technological dust and fuel into the furnace.

The aim of the invention is to increase. Improving device reliability and fuel economy.

On fig.G shows a general view of the rotary kiln with a dust nozzle and fuel-burning device; figure 2 - cross section of dust

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Moreover, in order to increase reliability, device and fuel economy, the dust nozzle casing is made with a dull topper wall between the casing and the nozzle, and its cavity is divided by a longitudinal partition into two interconnecting channels ^! one of which is connected to the cooling air pipe, and the other to the first air pipe of the combustion device.

• 2, Device by π. 1, that is, that it is provided with screw blades placed in the channels of the casing of the dust nozzle. · 3 "The device according to PP, 1 and 2, from the heading of the fact that the screw blades have holes that are displaced in adjacent blades relative to each other.

nozzles; on fig.Z - screw blades in the channels of the casing of the dust nozzle.

The rotary kiln 1 is equipped with a fixed discharge head 2, through which the fuel-burning unit is inserted into its internal cavity. It is designed as a primary air pipeline 3 with a fuel (fuel oil) nozzle 4 and a dust nozzle. 5 with a nozzle 6 for feeding powdered material, for example, recycled process dust. Dust nozzle 5 is placed in the housing 7 enclosing it with a blind end wall 8 between the case 7 of the nozzle in you,

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running end. The cavity of the casing 7 is divided by a longitudinal partition 9 into two channels Yui 1 1 / interconnecting between themselves at the outlet end of the nozzle 5. One channel 10 by nozzle 12 is connected to the cooling air pipe, and the other channel 11 is connected to the primary air pipe 3 fuel combustion devices. In the channels 10 and 11 of the casing 7 placed screw blades 14 with holes '15, displaced on adjacent blades relative to each other.

Liquid fuel is cut through a nozzle 4, around which a primary blown pipe is fed through a pipe 3 to the wire! air. Circulating process dust captured in the gas cleaning system from the exhaust furnace gases, through the pipe 6 is fed into the dust nozzle 5, through which blown air is blown into the furnace 1 above the fuel torch. Through pipe 12 serves cooling air in the first channel 10 of the cavity of the casing 7. Air, (passing along the 'dust nozzle, yes · "· steps through the hole in the partition 9 into the channel. 11 and moves along the dust nozzle 5 in the opposite direction to its input end , and then through pipe 13 enters the pipeline of primary air 3 of the fuel-burning device, through which it is fed into the furnace, intensifying the atomization and combustion of the fuel supplied through the nozzle 4. As the blowing air moves in the channels 10 and 1.1 of the peel 7, it meets screw blades 14 , acquires, zigzag movement, and

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part of it. passes along the axis through the holes 15 in the blades 14, shifted relative to each other on the adjacent;! , -. blades.

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The presence of the housing 7, covering; The dust nozzle 5 reduces the radiant heat flux from the lining surface of the furnace and the material to the burner [0 su nozzle 5. Air supply to the channels 10 and 11 between the casing 7 and the nozzle 5 provides additional cooling of the casing. 7 and nozzles. 5, and the flow of air heated to 150 ° C to 250 ° C in the primary air piping 3 of the combustion unit intensifies the fire. and burning fuel. At the same time, the ingress of cold air into the furnace is reduced, the heat treatment of dust in the suspended state is intensified, the combustion process of the fuel is stabilized, the underburning and specific fuel consumption are reduced.

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The presence of screw blades 14 with holes 15 intensifies the cooling-:: the cooling of the dust nozzle 15 due to the времени increase in the time and the contact path of ed I air with the metal of the dust nozzle

! and air flow turbulence.

. It also improves air heating.

Cooling the dust nozzle eliminates its thermal deformation, as well as reduces abrasive wear due to a decrease in metal temperature. Stabilization of the process of burning fuel and supplying technological dust contributes to the stabilization of the heat engineering regime and the improvement of the quality of the finished material.

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Claims (1)

'1. DEVICE FOR SUPPLY D] FURNACE OF TECHNOLOGICAL DUST AND FUEL 1 containing a dust nozzle locked into a casing connected to the cooling air supply pipe and a fuel-burning device connected to the primary air pipeline, which is * '