SU1751598A1 - Method of fuel burning in fluid bed combustion furnace - Google Patents

Abstract

Usage: in boilers of low and medium power, when creating devices for burning fuel. Summary of the Invention; The primary air stream is introduced counter-or-at-an-angle to the secondary stream with a speed equal to the given velocity of the secondary stream, the value of which is 3-8 times higher than the speed of the central stream. 1 il.

Description

The invention relates to power engineering and can be applied to create boilers of low and medium power, to create various devices when burning fuel in various aggregative states: solid, liquid and gaseous.

There is a known method of burning fuel, in which primary air is bubbling to form separation and afterburning zones, introducing secondary air into the afterburning zone and introducing tertiary air along the axis of the chamber. Here, the primary air is used to cause the fuel particles to become suspended. Secondary and tertiary air are directed so as to organize the zone of combustion of fuel particles. According to this scheme, burning of not only liquid but also solid fuel can be organized.

However, this method is characterized by a low volumetric thermal intensity of the combustion chamber, as well as insufficiently good organization of the process, which does not prevent the loss of unburned particles from the chamber volume. In addition, burning particles may enter the separation zone, which can lead to unpredictable consequences, i.e. the method is characterized by low reliability and combustion efficiency.

Closest to the present invention is a method of burning fuel in a primary-fluid-bed furnace with at least two peripheral flows — central under the grate and peripheral at a given speed.

The purpose of the invention is to increase the combustion efficiency.

This goal is achieved by the fact that according to the method of burning fuel in a fluidized bed furnace by introducing secondary air and primary air, at least two streams — central under the grill and peripheral at a given speed —

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The primary air flow is introduced in a counter or at an angle to the secondary flow at a speed equal to the set velocity of the secondary flow, the value of which is 3-8 times higher than the speed of the central flow.

The drawing shows a device for implementing the proposed method.

The drawing indicates: 1 - the central zone of the primary air flow, 2 - the peripheral zone of the primary air flow, 3 - the combustion zone, 4 - the secondary air inlet, 5 - the discharge of gaseous combustion products, 6 - the fuel inlet.

The proposed method is carried out as follows.

The primary air flow is divided into central 1 and peripheral 2, which is attached to a swirling motion. The secondary air flow 4 is supplied peripherally and has a twisted motion in the same direction as the peripheral primary air flow. The fuel 6 is introduced into the central part above the primary flow. The fuel introduced for combustion is picked up by the primary air flow and directed to the burning zone 3, where the fuel particles make a complex movement, describing a complex trajectory and combustion. And only small

the burnt particles that form the ash go to the drain. Large unburned particles are discarded to the periphery where they are involved in combustion in fresh portions of the feed.

of air. Combustion gas 5 is discharged at the top of the chamber.

The combustion apparatus can be used mainly for burning solid fuels having a ash residue that needs to be removed. If the fuel does not have ash, then the device can work not only in the vertical, but also in the horizontal direction. The device can work on

Claims (1)

liquid and gaseous fuels. The method will reduce underburning. Claims of Invention A method of burning fuel in a fluidized bed furnace by injecting secondary air and primary air with at least two streams — central under the grill and peripheral at a predetermined rate, which is characterized by the fact that in order to increase the efficiency of combustion, the peripheral stream is primary. air is injected counter to or at an angle to the secondary air at a speed equal to a given flow rate of secondary air, the value of which is 3-8 times higher than the speed of the central flow. S / nofxsMbtu зд & monstv gshouhugly eio & ortt / ff  MUSH