SU1672118A1 - Pulverized-coal burner - Google Patents

Abstract

The invention relates to the combustion of solid fuels and is intended for use in boilers equipped with swirling furnaces with a vertical torch rotation. The purpose of the invention is to increase the efficiency of combustion. Nozzles / C / 2 air mixtures are located in the same vertical plane and are irregularly inserted into a slotted vertical box of primary air with the separation of the cavity of its outlet part into compartments 3. To the outlet section of the side wall of the box at the levels of compartments 3 are connected branch pipes / P / 4 secondary air inclined at an acute angle to C 2. The projections of the P 4 axes onto the plane of the compartments 3 are parallel to the C 2 axes. The height of the compartments of the output windows / BO / P 4 are located relative to the BO of adjacent C 2 with gaps δ of at least 0, 1 width H output slice box. A layer of primary air is formed along the periphery of the air mixture flows downstream of the outlet section of the duct, moving in the same direction as the air mixture. Due to this, a reliable separation of the secondary air and air mixture flows with the concentration of coal dust and a small part of the primary air necessary for burning volatiles from the oncoming flow of firing gases is achieved. Favorable conditions are created for the early and stable ignition of coal dust, as well as a rapid transition to the advanced combustion stage, accompanied by intensive mixing of the fuel particles with secondary air. 4 il.

Description

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valleys and, in a row, are placed in a slotted vertical duct (K) 1 of primary air with separation of the cavity of its outlet part into compartments 3. To the outlet section of the side wall 5 K 1 at the levels O there are nozzles (P) 4 of secondary air tilted under the sharp angle to C 2 The projections of the axes P 4 to the plane of the compartments 3 are parallel to the axes C 2. The height of the compartments of the output windows (BO) P 4 are located relative to the BO of adjacent C 2 with gaps d of at least 0 1 of the width H of the output cut of the duct On the periphery of the flow of the mixture after the weekend a cut of the box forms a layer of

The problem is related to the burning of solid fuel and could be used in boilers equipped with swirling furnaces with a vertical torch rotation.

The purpose of the isosteni is to increase the iHocTH of the combustion process iHocTH.

Fig. 1 shows the pulverized angle of the mpggle, a slit section, fig. 2, - A 1'4 (/ | G figure 3 - b-Fb on .2 in fig., A typical prismatic firebox, burner gami.

The angle of the gdrelka is with / snaps into the fresh gold hour of the PC mnOno i orc5 1 of the first ii of the hour. o, 1,1 a 2 attributes of the soil of the butt into the exit part of coyube 1 and dividing its cavity into glsiki 3 and digest B of the original air, made as a group of pipe 4, connected to the exit section of the large side wall C, X are both primary AIR at the level of the compartments 3 The nozzles 4 of the secondary air are inclined at an acute angle to the nozzles 2 aapoc RSI. which are located in the cow 1 air nepoHHhjro axially and in one plane. The projections of the axes of the secondary air nozzles 4 onto the plane of location of the nozzles 2 air mixtures are parallel to the axis of the nozzles 2. The height of the compartments is about the outlet windows 6 of the secondary air nozzles 4 of the secondary air p. RELATED OUTPUT WINDOWS 7 roi, HOSES

nozzle mixtures with gaps 3, which are not less than 0.1 width H of the output cut-off section 1 of the primary air

Several of the above described satellites are located in the corners of the vertical heater 8, with a tangential surface of the nozzles of the nozzles 2 of the air mixture and the pipe and of the primary air moving in the same direction as the air mixture. Due to this, proper separation of the secondary air and air mixture flows with the concentration of coal dust and a small part of the primary air necessary for burning volatiles from the rising flow of igniting flue gases is achieved. Favorable conditions are created for the early and stable ignition of coal dust and fast transition to the stage of advanced combustion, accompanied by intensive mixing of fuel particles with secondary 8OZVVXOM 4 IL

of air to the conditional circumferences of a correspondingly larger diameter of the Nozzle 2, the mixture and the pipes 4 of the secondary air can be oriented in different directions in the furnace (Fig. 4) or in one direction

PMG zugolya burner works as follows: -i

Aerosmegy P BI ae of coal dust and su

the stitching agent is fed through the nozzles 2 of the first air, g; x through the duct 1, the secondary air through the nozzles 4. The total amount of air supplied from the air mixture and

the primary quality is 30–40% of the total air injected into the fire chamber. The primary air flows between the nozzles 2 aero mix in compartments 3 at a low speed collide with the secondary air streams flowing out of the nozzles 4 at high speed, resulting in a discharge section duct 1 at compartment level 3, a system of voids is formed, moving crosswise with

air mixture flows The angle between the directions of the resulting air jets and the air mixture flows is somewhat less than the angle a between the axes of the nozzles 2 and nozzles 4. Its specific values for a given value

the angle a depends on the ratio of the initial pulses of the flows of the primary and secondary air. Due to the fact that in the proposed burner between the output windows 6 and 7 of the nozzles 4 and nozzles 2 at the height of the compartments 3

gaps 8 are formed; a layer of primary air moving in the same direction, o and the air mixture, is formed along the periphery of the flows of the air mixture after the exit slice of the box 1.

For systems with a temperature of 20-60 °, it is advisable for practical use, the ingress of dust into the secondary air at the flare ignition section is completely excluded when the values of gaps are not less than 0.1 of the width H of the output section of the primary air duct 1. Reliable separation of aerosol and secondary air streams with a concentration of coal dust and a small part of the primary air necessary for burning volatile, from the side of the incident flow of firing combustion gases (the direction of vortex movement of gases in the furnace in figure 4 is counterclockwise), contributes to stable and early ignition, and, consequently, a more rapid transition to the stage of advanced combustion, which takes place with vigorous mixing of the fuel particles with secondary air in the vortex flare. At the same time, favorable conditions are provided for keeping the concentration of nitrogen oxides in the flue gas at a low level.

Claims (1)

DETAILED DESCRIPTION A dust burner comprising a slotted vertical primary air duct and a secondary air duct, connected at an acute angle to the exit section of the larger side wall of the primary air duct, and aerosol nozzles, installed in the exit part of the primary air duct and dividing it on the compartments, the axes of the primary air duct and the nozzles of the air mixture are placed in the same plane, parallel to each other, and the projection of the axle of the secondary air duct on the indicated plane, which differs from topics that, in order to increase the efficiency of combustion, the secondary air box is designed as a group of pipes connected to the compartments of the primary air box, with the last exit windows being at a height of The nozzles are positioned relative to the exit windows of adjacent aero-mix nozzles with gaps that are at least 0.1 of the width of the output slice of the primary air duct. 1 V77 W / L Fig.E 4