SU996830A1 - Conveyer machine roasting machine - Google Patents

Description

. The invention relates to the field for the preparation of iron ore raw materials in ferrous metallurgy, in particular to Honstruk-II, an annealing conveyor machine.

Gas conveying systems of a conveyor type for heat treatment of lumpy materials are known, containing a heating furnace with fuel-burning devices, chamber overflow collectors, connecting pipes with adjusting valves and plugs for ventilating the volume of the furnace fl.

The disadvantages of the known devices are the uneven distribution of high; transient air from the collector on both sides of the hearth and, as a result, uneven heat treatment of the layer; high specific heat consumption per process due to uncontrolled distribution of the high-temperature heat transfer medium in individual technological zones / location of the overflow collector above the mountain and significant size of the firing machine in height.

The closest to the proposed technical essence and the achieved result is the device.

including a conveyor type baking machine for heat treatment of lump materials containing drying, heating, burning and cooling sections and a gas flue system having a heating hearth with fuel-burning devices, a flow-through collector: chamber type, and connecting pattO choppers with adjusting valves, inclined connecting sections of the cooling section and candles for the valve. the volume of the hearth, the collector is equipped with. van partition wall, and the connecting pipes - complementary "1 day

compressor air supply 21.

The disadvantages of the known construction are the uneven gas flow rate Ul on both sides of the furnace hearth, the location of the overflow collector over the mountain, which complicates its maintenance; the height of the firing machine is considerable and, as a result, the increase in the building volume of the building and the thickness of the burning capacity of the firing equipment.

Claims (2)

The purpose of the invention is to reduce the specific heat consumption and reduce the metal consumption of the roasting machine. 39 The goal is achieved: The fact that in the kiln conveyor machine; a type for the heat treatment of bulk materials containing sections for drying, heating, calcining and cooling and a gas flue system having. heating, a furnace with fuel-burning devices, nepejo4Hke chamber-type collectors, connecting pipes with adjusting valves, inclined connecting boxes of the cooling section and candles to ventilate the furnace volume, the collectors are located on both sides of the burning machine below the furnace hearth, and the distance between the axis of the collectors and with a roof of the hearth, at least 0.2 of the height of the hearth is made vertically; in this case, the heating and firing sections of the machine are connected to the collectors by inclined distribution nozzles. The dust removal pits and spills from the system collectors are made inclined at an angle of 0.5-4 ° to the horizon in the direction of the pipes (they are heated and equipped with devices for removing spills from them. Modern kiln conveyor machines are bulky (. especially in height) and metal-consuming facilities. The location of the overflow collector over the furnace of the kiln machines leads to an even greater increase in their height. Therefore, the development of a new design of the kiln machines with the lateral arrangement of the recirculating collector allows to lower the metal content of the structure. . Flow header should be. located on both sides of the roasting machine below the roof of the hearth, which makes it possible to evenly distribute the coolant on both sides of the hearth. Other than the location of the overflow manifold leads to an increase in the dimensions of the unit. The vertical distance between the axis of the overflow collectors and the roof of the hearth should not be less than 0.2 of the height of the hearth. With a smaller distance of the scientific research institute, the collector for the most part is located above the mountain, which leads to deterioration of its service conditions and an increase in the dimensions of the unit. The connecting boxes of the cooling zone are inclined, the connecting distributing pipes of the remaining zones (heating, firing) must also be inclined, which is due to design considerations. Based on the calculations, the overflow collectors are made with a total living section of 0.75-1.0 from the cross section of the hearth, the connecting ducts of the cooling zone are not less than 1.1 from the total cross section of the manifolds, the connecting distributing pat304 felling - 1, 2 from the section cooling zone boxes. The living section of the distributing pipes of the fire and firing zones should be made in the ratio 1: (2-7). . The gases recirculated from the cooling zone may contain some amount of dust, spillage and separate particles of bulk material. Therefore, the overflow collectors must be equipped with a device for collecting and removing this spill from the system. Otherwise it is possible that the collectors are clogged and the emergency stop of the entire unit Scraper collectors should be made inclined at an angle of 0.5–4 to the horizon in the direction of the nozzles of the heating zone. The combination of the slope of the collectors with the direction of movement of their coolant provides movement (by gravity) spills. to the blind end of the collector, collecting spillage into the intermediate tank and removing it from the system. The inclination of the collectors at a smaller angle does not always ensure the advancement of spillage by gravity, at a greater angle, without improving the conditions of movement of spillage, leads to an increase in the height of the roaster. n FIG. 1 shows the proposed machine, a cross-section, in Fig.2 the same, top view. The gas-flow system consists of a fire chamber 1 with pre-chambers 2 and fuel-burning devices with burners) 3, re-flow collectors 4, junction boxes and nozzles 5 and exhaust gas collector b. Horn 1 is divided into zones of drying 7, preheating 8, roasting 9 and cooling 10. at the beginning of the preheating zone in the collector. 4, a hopper 11 is provided for collecting spillage. The gas conveying system of the burning conveyor machine works as follows. During operation of the machine, the drying zones 7, preheating 8, roasting 9 and cooling 10 successively pass through. The air sucked in the cooling zone through the pellet is heated to 900 ° C, enters the furnace 1 and then through the connecting boxes into the overflow manifold 4. The heated coolant is moved along. the downstream collector in the direction of the burning zones 9 and heating 8 and through the connecting pipes 5 are fed into the prechamber 2. The air-fuel mixture is burned in the burners 3, mixed with the heated coolant, forming a hot gas-air mixture with the temperature required for heating and burning, served in Horn 1 and pass through a layer of pellets, heat-treating them. Exhaust gases by means of the pump from the system through the manifold 6.. The described mode of operation of the gas-flow system is possible when the primary collectors are located on both sides of the hearth of its reservoir, and the distance between the collector axis and the hearth arch should be equal to 0.5 of the hearth height. For example, for an OK-520 firing machine with a mountain height of 3.5 m, a width of 4 m and a cross section of 3,. 14 m, the distance between the collector axis and the hearth vault is 0.5 x.3.5 1.75 m. Pvrvt, internal collectors: made from a total living section equal to 75 from the cross section of the hearth, I.e. in this case, 0.75 x X 14 10.5 m. The junction boxes of the cooling zone have a total cross section equal to i. 2 from the cross section of the collectors, i.e. 1.2 x 10, S at 12.6. The connecting pipes of the preheating and firing zones have a total free cross section of 1.0 from the cross-section of the cooling zone boxes, i.e. also 12.6 m. The living cross-section of the nozzles of the heating and revolving zones is made in the ratio | 1: 4. For the OK-520 machine, the live section of the nozzles 5 is. -2.5 m, for the preheating zone - -5 X 4 - 10.1 k. for the burning zone In order to reliably remove the spillage of the collectors 4, they are made inclined towards the branch pipes of the preheating zone (the installation site of the bunker 11 for collecting and periodically removing the spillage) at an angle of 1.5 ° to the horizontal. The application of the invention provides a reduction in the dimensions of the roasting machine in height. The latter makes it possible to reduce the construction volume of a building per l / 53000 m (right from one firing machine) and to reduce the metal intensity of a machine by Zo-.400 t. In addition, a; 1Insulated gas duct. the system ensures a reduction in the specific fuel consumption per process by 8–11% with an even distribution of heat transfer media to both sides of the hearth. With this improvement in process performance, the expected economic effect is 0.45 million rubles per kiln machine. Claim 1. Burning conveyor machine of the type containing drying, suspending, burning and cooling sections and a gas flue system that has a heating furnace with fuel QI devices, flow manifolds of kg type, connecting pipes with reg} lyric valves, inclined: junction boxes cooling and candles for ventilating the hearth, characterized with. so that, for the purpose of metal metal consumption of the kiln, the collectors are located on both sides of the kiln below the hearth, and the distance to the axis of the collectors and the roof of the hill is not less than 0.2 the height of the hearth, and the heating and calcining sections the machines are connected to the collectors by nylon distributors. 2. The machine according to claim 1, so that, in order to increase the efficiency of dust removal and spillage from the system, the collectors are made inclined at an angle of 0 to the horizontal plane in the direction of the nozzles of the heating section and equipped with spillage removal devices. h Sources of information taken into account during the examination 1. Berezhnoy I.N. and others. Production of iron-ore pellets. M., Nedra, 1977. 2. Authors certificate of the USSR 664005, cl. F 27 At 21/06, 1978.