SU968565A1 - Rotary kiln - Google Patents

Description

(S) ROTATING OVEN

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The invention relates to a technique for the production of portlancement clinker, magnesite, alumina, and other calcining materials, which have rotating furnaces. I

The known B1 rotary kiln for burning carbon-bearing materials contains a lined refractory cylindrical body and a device for burning tsplida in sintering and decarbonization, made in the form of burners evenly spaced around the circumference of the housing 3 "

However, in this furnace it is impossible to ensure the supply of liquid ts or pulverized fuel to the layer of material.

The closest in technical essence and effect achieved to the invention is a device for supplying a gas-air mixture to a rotary kiln, in which the burner bodies are connected to the furnace body through nozzles, with part of each nozzle.

ZS Yuchenna in the lining, made in the form of a cylinder. The gas passing through the gas flow into the diffuser is in one plane, and in the other, first, first, into the confuser, and each nozzle is equipped with a cleaning device in the form of a latok mounted on a hollow perforated moving stream, and the injectors are mounted in the inner cavity of the pipelines . Each nozzle is equipped with a gas chamber covering the rod in the place of its perforation, 2 J.

A disadvantage of the known device is its complexity, adaptability, mainly, for burning gaseous fuel in a mixture with unheated air. Moreover, the device is designed for furnaces of medium and low power ..

Claims (2)

The aim of the invention is to intensify heat exchange by uniformly distributing the fuel in the material layer 96 and the possibility of supplying liquid and pulverized fuel to the layers. This goal is achieved by returning a kiln for burning carbonate-containing material containing a cylindrical lined with refractory blocks, a device for supplying a fuel-air mixture to the decarbonization zone, in the form of circular ring fuel and air collectors mounted on the furnace body, connected to the gland axial transmitting device, and longitudinal fuel and air collectors connecting the corresponding annular collectors with nozzles, the output part of which is The ac in a shaped lining, shaped blocks in which the output parts of the nozzles of the longitudinal fuel manifolds are installed, are made with L-shaped openings and protruding above the main surface of the lining, while the outlet openings located in these blocks of nozzles are directed to the side material movement during kiln rotation. FIG. Figure 1 shows a part of a rotary kiln in the area where the decarbonization zone is located with its wall cut-out, the section; in fig. 2 is the same cross section. The rotary kiln contains a cylindrical case 1 placed at the beginning of the decarbonization zone around the circumference of the shaped refractory blocks 2 inside which the output parts of the nozzles 3 of the longitudinal fuel assemblies 4 with gaps 5 for air passage are mounted, connected directly or through the fuel manifold 6 with the distributor Packing gland (not shown). The air space formed between the walls of the shaped refractory and the nozzle 3 and intended for air blowing the nozzle 3 is connected through an opening in the housing with the air duct 7. The nozzles 3 have branches 8 outwards, equipped with flexible rods 9 for cleaning from clogging. On the outer side of the body of the decarbonization zone I, the forming air ducts 10, which are equal to the diameter of the furnace, are uniformly distributed around the furnace. The composite air ducts 10 have machined and ground connections 13 between the inlets to the furnace. They are designed to compensate for the temperature lengthening of the furnace body. Air ducts 10 have overlapping outlets 1 for purging against clogging. Above openings 12 for supplying air inside the furnace body, dual shaped refractory blocks 15 are installed with cylindrical inlets, which are transferred to the elongated slots 1b. The rest of the body in the decarbonization zone is footed by a conventional refractory brick 17. The rotary kiln works as follows: Sludge, blunt into the rotary kiln, passes through a chain sludge-filter-heater, operating according to the principle of continuous, jetting the chains. sludge when the kiln is rotated, heated and partially condensed; the sludge enters a spiral-chain curtain in which it is dried before the formation of granules and is further directed to a chain curtain with free-hanging ends. In this curtain, the material is crushed to small granules and heated to ZOO-BOOO C. At the site in the furnace where (the material reaches temperature 710-85P C, liquid or dust-like fuel is supplied directly under the layer of moving material. Inlet, fuel made from a hot or cold furnace stove through a gland distribution sleeve connected by a pipe with several openings placed around the decarbonization zone. By means of a distribution gland sleeve the fuel is merged under the layer of material and when the kiln is rotated, it mixes with it. The compressed air passes through a coil heater placed in the upper hot chamber of the refrigerator, flows through the air ducts and the shaped lining under the material layer...,..: .-: Further as you touch fuels with opposing hot gases, oxygen-enriched (when excess air is supplied to the furnace for burning fuel, as well as air being blown under a layer of material), flameless combustion of the fuel mixed with the material occurs. The heat released is intensively absorbed by the material in connection with the endothermic decarbonization process. At the same time, the rapid release of C02 will promote fluidization of the material. This (Provides uniform distribution of heat in the material and increasing its temperature without increasing the gas flow rate;; Additional combustion of fuel before the exothermic reaction zone will increase the productivity of pemes by 30-50% and —enisit specific 0ackOA 10-15 due to the intensification of the decarbonization process and more of the rational distribution of 1Ne teIlurture of the gas flow of the rio stream to ions b corresponding to ter chemicality (by the processes of “leaking into them, as well as ensuring the activation of components of the material being boiled before sintering This invention will reduce: the supply of clinker formation and cooling and improve the quality of the clinker. Claim of a rotary kiln for firing carbonate containing material, containing a cylindrical body lined with refractory blocks, feeding device, fuel-air system, and a 1-carbonization zone made in the form of 96 5 mounted on the furnace housing distribution ring fuel and air collectors connected to the gland axial transmission device, and longitudinal fuel and air collectors, connected Corresponding annular manifolds with nozzles, the output part of which is located in the shaped lining, is due to the fact that, in order to intensify heat exchange due to the even distribution of fuel in the material layer and the possibility of supplying liquid I into food pulverized fuel, shaped blocks, in which the output parts of the hopper of the longitudinal fuel columns are installed | fulfilled with. The perforations and protruding above the main surface of the lining, with the output openings of the nozzles located in these blocks, are directed in the direction of material movement as the kiln rotates. Sources {“: and information taken into account during the examination 1. The author's certificate of the USSR If 705227, cl. 27 B 7/36, 1977. 2. USSR author's certificate number 53t007, cl. 27 8 7/36, 1972 (prototype).