SU1170226A1 - Method of preparing solid fuel for burning and device for effecting same - Google Patents

Abstract

1. A method of preparing solid fuel for combustion by heating the auxiliary fuel with combustion products, characterized in that, in order to improve efficiency and reliability, the fuel is additionally heated by directly acting on it from the torch obtained by burning the auxiliary fuel fed to the burning zone tangen) , with the formation of a vortex, (L and solid fuel is introduced into the center of this vortex. 1

Description

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2. A device for preparing Solid fuel for combustion, containing a cylindrical heat treatment chamber with an axial solid fuel supply nozzle and an exit window at opposite ends, tangential air supply nozzles and a flat diaphragm with a central one. a hole located across the chamber with an annular gap with respect to its walls, characterized in that, in order to increase efficiency and reliability, in the zone of tangential nozzles

the air supply is additionally installed. The tangential nozzle of the auxiliary fuel supply is installed, the diaphragm is set at a distance from the exit window equal to 0.68-0.73 of the chamber length, and its central opening is made with a diameter equal to 0.65-0.75 of the chamber diameter.

3 .. The apparatus according to claim 2, characterized in that, in the annular gap between the diaphragm and the walls, the chambers are additionally fitted with swirl blades.

This invention relates to the field of fuel combustion and can be used at thermal power plants.

The aim of the invention is to improve the reliability and efficiency

FIG. 1 schematically shows a device for carrying out the proposed method, a longitudinal section; in fig. 2 shows section A-A in FIG. one.

A device for preparing solid. The fuel for combustion contains a cylindrical heat treatment chamber 1 with an axial nozzle 2 for supplying solid fuel and an exit window 3 at opposite ends, tangential nozzles 4 for supplying air and a flat diaphragm 5 with a central hole 6, placed in the chamber with an annular gap 7 relative to its walls. In the area of the air supply tangential nozzles 4, the tangential auxiliary fuel supply nozzle 8 is additionally installed, and the diaphragm 5 is installed at a distance from the exit window 3 equal to 0.68-0.73 of the length of chamber 1, and its central opening 6 is made with a diameter of 0 , 65-0.75 diameters of the chamber 1. In the annular gap 7 between the diaphragm 5 and the walls of the chamber 1 can be additionally installed swirl blades 9. The chamber 1 with its output window 3

connected to the furnace 10 and provided with an annular air nozzle 11 in. furnace 10.

The method of preparing solid fuels for combustion is carried out in the following manner.

Coal dust along with a transporting agent from the boiler dust preparation system is fed axially

through the axial nozzle 2 into the heat treatment chamber 1, creating a stream of concentrated a mixture of coal dust with a transporting agent. Simultaneously into chamber 1 tangentially

fuel oil is supplied through the nozzle 8, and the air necessary for its combustion is fed through the nozzles 4, while a swirling motion of the burning fuel is formed around the jet of coal dust mixture. At this stage, the jet of coal dust in chamber 1 is heated mainly due to the emission of the fuel oil torch. In the passage through the hole 6 in the diaphragm

5 and after the diaphragm 5, part of the products of the combustion of fuel oil in a vortex is mixed into the jet of coal dust mixture. As a result of heating the coal dust, volatile flammable substances are released from it. The remaining portion of the products of the combustion of fuel oil, the passage through the annular gap 7 between the diaphragm 5 and the cylindrical wall of the chamber 1, rotates near this wall, preventing the accumulation of coal dust on it.

The furnace 10 through the exit window 3 receives a stream consisting of the combustion products of fuel oil, leaking volatile substances and a heated mass of coal dust. Interact with the air supplied through the con

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11, highly flammable volatile substances, combustion, produce the heat required for stable combustion of coal in the boiler furnace. Coal 5 dust in chamber 1 is heated to 400 dss.

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Claims (3)

1. The method of preparing solid fuel for combustion by heating it with the combustion products of auxiliary fuel, which is due to the fact that, in order to increase efficiency and reliability, the fuel is additionally heated by directly affecting it with a torch obtained by burning auxiliary fuel supplied to the combustion zone tangentially, with the formation of a vortex, and solid fuel is introduced into the center of this vortex. 2. A device for preparing Solid fuel for combustion, comprising a cylindrical heat treatment chamber with an axial nozzle for supplying solid fuel and an exit window at opposite ends, tangential nozzles for supplying air and a flat diaphragm with a central one. an aperture placed across the chamber with an annular gap with respect to its walls, characterized in that, in order to increase economy and reliability, an additional auxiliary fuel is installed in the zone of location of the tangential air supply nozzles, the diaphragm is installed at a distance from the exit window, equal to 0.68-0.73 the length of the chamber, and its Central hole is made with a diameter equal to 0.65-0.75 of the diameter of the chamber. 3 .. The device according to p. 2, characterized in that, in the annular gap between the diaphragm and the walls, swirl blades are additionally installed.