SU279854A1 - TECHNICAL ^ •• 'i BBLKETE "D - Google Patents

Description

The invention relates to devices for preparing dosing and feeding pulverized fuels to burners in an aero-liquefied state and can be used in heat and power engineering, in the metallurgical, chemical and other industries.

Apparatus of similar purpose is known, which contains a hopper with a feeder for the supply of raw coal, a dryer and a coal-grinding mill through which the drying agent (hot air or a mixture of air with hot gases) is blown, a separator, a cyclone for separating the coal dust from the drying agent, the hopper dust with a feeder-dispenser and dust pipes, but with which the dust is transported by primary air to the burners.

The drying agent, separated from the dust, is exhausted with an exhauster by suction from the cyclone and discharged into the atmosphere or into the air box for further use as primary air.

Such devices have a large working volume under vacuum, which leads to significant cold air suction, deteriorating combustion process and newer energy consumption for blasting, significant length of a dust-gas path with large diameter dust pipes with a bulky system of separation and dust deposition, which leads to a high consumption of metal. In addition, for the length of the deposited deposits, the dust-gas mixture velocity was kept high in dust drives and other parts of the device at a high level (up to 25-30 m / s), which increased abrasive wear of the devices.

In the known devices, the diving into the boiler furnace is supplied only with a low concentration (from 0.05 to 1.1 kg / kg), which does not correspond to the optimum combustion mode.

The proposed device does not have these disadvantages but differs from the known ones in that an aerated multi-doser is installed under the ready-made dust bin for distributing dust to burners and supplying dust to the latter in aero-liquefied state.

The drawing shows a diagram of the proposed device.

The device contains a bunker / raw coal, a raw coal feeder 2 2, a steam heated dryer 3, an electrostatic precipitator 4, a shutter (flashing light) 5, a finished dust bin 6, a non-ventilated ball drum 7, an aeration multi-endosator 8, a blower 9, dust pipes 10 and burner 11.

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fuels water vapor cleaned from coal ached in electrostatic precipitator 4 and emitted into the atmosphere. The dust precipitated in the electrostatic precipitator goes down through the vSaTBOp 5 into the bunker 6. The pre-dried fuel from the dryer 3 enters the mill 7 and after grinding as dust by gravity enters the bunker 6, in the lower part of which an aerosio multi-doser 8 is installed. low pressure, with which coal dust is brought into aero-liquefied state and supplied via dust pipes 10 to burners.

In the proposed device there are no areas that were found during the operation of iodine underpressure, which prevents air from leaking; significantly reduced the length of the transport route from the mill to the burners and reduced diameters of pipelines, which reduces the intensity and cost of the device;

The dust supply to the burners is carried out in an aero-liquefied state with ultra-high co-nitration (on the order of 200-250 kg / kg), which allows to improve the process and almost eliminate the abrasive wear of the dust pipe elements, as dust with this concentration is transported at a speed not exceeding 7-7.5 m / s.

Subject invention

A device for the preparation and supply of pulverized fuel, containing a hopper with a raw coal feeder, a dryer, a coal mill, and a hopper of finished dust,

characterized in that, in order to ensure the transport of dust to the burners with a high concentration and to reduce the metal intensity, an aerated multi-doser is installed under the bunker of the finished dust to distribute

over the burners and feeding the dust into the aero-liquefied state.

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