SU739323A1 - Agglomerating machine - Google Patents

Description

The invention relates to the building materials industry, the metallurgical industry and can be used in the construction of belt conveyor machines for sintering the batch in the production of agglored material - artificial porous lightweight concrete and agglomerate semi-finished aggregate, obtained by sintering ore-containing raw materials in ferrous and nonferrous metallurgy. Belt conveyor sintering machines are known for sintering a batch laid with a layer of a certain thickness onto a movable grate, with constant downwash of air from top to bottom through a layer of sintered material. These sintering machines contain a charge loading device, an incendiary horn, a moving grate, consisting of an endless band of sintering carts, a series of vacuum chambers, adjoining them, at the top of the grate, and at the bottom connected to the central collector of gases, and the unloading device of the sintered crust The closest to the technical essence and the achieved result is the sintering machine, containing the grate, on which are located the vacuum chambers, the loading device, the hearth and ushilka, connected by pipelines with pyleosaditelnym cyclone and through the exhauster - a vacuum chamber under mountain 2. disadvantage of this known sintering machine is that the drying gas distribution element, which is a grate, because of the nonuniformity of the living section has a stagnant zone. During operation, the gap between the grate bars and the batch material, the specs, often occurs. This leads to a decrease in the living cross section of the lattice and a simultaneous increase in its hydraulic resistance to coolant flows. This circumstance greatly violates the stability of the drying process in the fluidized bed and requires constant cleaning of the gaps in the grate from the material specimens that are inevitably formed during the agglomeration process. In addition, in the Known machine, the drying element of the charge in the fluidized bed is designed in such a way that it occupies the head part of a belt-type sinter machine from the charge loading unit to the incendiary hearth, thereby reducing the net working area of the grate.

The aim of the invention is. increase the reliability of work without reducing the useful plosh; go car.

For this, the dryer is made with an inclined gas distribution grid and is installed in front of the sintering machine.

The figure schematically shows a belt conveyor sintering machine.

The sintering machine contains a device for drying the mixture in a gas-weighed state, consisting of sublattice chamber 1, gas distribution grid 2 and drying reactor 3, pipeline 4, dust precipitation cyclone 5, central bell 1.:; - 10p 6 for gas exhaust, ignition horn 7, vacuum chamber 8 of the hearth, gazovod 9 and smoke exhauster 10 of the recycling system ..

Agglomerative machine works as follows.

The pelletized charge or pellets from the hopper 11 of the granules are fed by the feeder 12 to the inclined gas distribution grid 2 of the drying reactor 3. Then the wet charge layer is blown with an ascending stream of hot gases, which are sucked off from the vacuum chamber 8 located under the incendiary mountain 7, and an individual gas line 9 is pumped into the subgrid chamber 1 of the drying reactor 3 by the exhauster 10 of the recirculation system. Hot gases blown through the gas distribution grid 2 convert the layer of wet granules of the charge to a gas-weighted ( It is an additional condition, overcoming the forces of gravity and cohesion of individual granules among themselves. When the mixture of the mixture over the gas distribution grid 2 boils, the specific surface heat and mass transfer between the individual granules of the mixture and the hot gases increase significantly, which creates a high mobility (fluidity) of the layer and intensive mixing of the charge granules, resulting in a drastic reduction in the drying of the granules . Simultaneously with drying the mixture in a gas-weighted state, a small fraction, for example, less than 1 mm, is separated out from the ascending gas flow by selecting an appropriate gas injection rate through the grid 2 to the drying reactor 3. The small fraction separated from the total mass

739323

The charge through conduit 4 enters the dust precipitating cyclone 5 along with the gases, precipitates there and then returns to the secondary preparation to the granulator (pelletizer charge). Gases purified in cyclone 5 from small particles of the mixture are fed (sucked) through conduit 4 to the central collector B of the gas outlet and are removed by an exhauster into the atmosphere. The mixture, dried to zero humidity and simultaneously separated, is placed on the moving grate 13 of the sintering machine, is ignited by the mountain 7 and is sintered in a known manner with air through the dried layer from top to bottom using vacuum chambers 14 that are also connected downwards with the central collector 6 of the gas outlet. For the substance of the wetting granules in a gas-weighted state, with a temporary release of its fine fraction, hot gases are used, which are sucked from the vacuum chamber of the incendiary mountain exhaust fan of the recirculation system and are pumped to the subgrid-type drying reactor chamber according to the individual gas outlet. At the same time, the heat of hot flue gases sucked from under the furnace is completely utilized, save fuel (solid, liquid or gaseous) consumed by the furnace nozzles for ignition of the charge, and increase the gas permeability of the dried and separated bed of the subsequent sintering process.

The use of an sintering machine of the proposed design, equipped with a fluidized bed dryer with a fixed gas distribution grid, provides a more uniform distribution of hot gases (heat carrier) injected by the smoke exhauster over the entire area of the grid and the section of the dryer, while reducing the breakthroughs of gases passing past the dried Schicht layer, which creates the necessary conditions for heat treatment of materials in a stable (stable) mode. Thus, the use of a dryer with a fixed gas distribution grid stabilizes the mode (process) of heat treatment of the wet charge, reducing the time of the substance and at the same time increasing the degree of uniformity (in humidity) of the material being processed. In addition, the heat treatment of the charge in the dryer, which is an autonomous sealed apparatus that is outside the maschine, eliminates the need to create reliable (efficient) seals, which is the case for the prototype object.

The use of the fluidized bed substance, the structure of which has no moving units (parts), significantly increases the operability of the substance and increases the reliability of the operation of the entire sintering whole.

Claims (1)

Claim Agglomeration machine containing a grate, under which there are vacuum chambers, a loading device, a furnace and a dryer connected by pipelines to a dust precipitation cyclone and through a smoke exhauster with a vacuum chamber below the furnace, characterized in that, in order to increase the reliability of operation without reducing useful area of the tire, the dryer is made with an inclined gas distribution grid and is installed in front of the sintering machine.