SU1562595A1 - Method of producing a stable crystalline form of geophalosporins - Google Patents

Abstract

The invention relates to furnaces of boiler units and can be used for burning slagging brown coal. The purpose of the invention is to increase the effectiveness of the protection of radiation heating surfaces from slagging. The vertical prismatic furnace contains slotted front burners 2 and slot nozzles 5 and 6 of gaseous blowing on the rear wall 4, located symmetrically relative to the plane 3 of symmetry of the furnace and vertically at the same level, with the axes of the burners directed towards the cold funnel. At least three extreme burners 2 are installed at an acute angle to the plane 3 of symmetry of the furnace, extreme nozzles 5 are parallel to the side walls of the furnace and the axis of adjacent nozzles 6 are oriented towards the nearest side walls. In the central part of the rear wall of the furnace, there is an additional vertical slot of the embrasure with horizontal slotted nozzles 8 placed therein, alternately directed towards the opposite side walls of the furnace parallel to the vertical nozzles adjacent to the abrasion 6. Moreover, the cross-sectional area of all horizontal embrasures is 2-4 times larger than the area cross section adjacent vertical slit nozzle 6. 3 Il.

Description

The invention relates to furnaces of boiler units and can be used in thermal power plants when burning slagging brown coal with

The purpose of the invention is to increase the efficiency of protection of radiation heating surfaces from slag.

FIG. I shows a furnace with an even number of burners, a longitudinal section; in Fig „2 - section А-А on fig-3 - rear wall

Sneaker contains a cold funnel i} an even number of frontal

Straight vertical slit burners 2j, inclined down towards the cold funnel and at an acute angle to the plane 3 of the furnace symmetry. On the back wall 4 of the furnace at the same level as the burners 2 are vertical nozzles 5 and 6 of gaseous blowing. Extreme nozzles 5 are directed along the corresponding side walls of the furnace, and adjacent nozzles b to the side walls of the adjacent side walls. In the central part of the rear wall 4 of the furnace, there is an additional vertical slot 7, in which horizontal slotted nozzles 8 are alternately directed in the side of the opposite side walls of the riapanally adjacent adjacent vertical nozzles 6 The cross-sectional area of the central embrasure 7 (and therefore the total cross-sectional area of all horizontal / nozzles 8} A 2-4 times exceeds the cross-sectional area Nor vertical slotted nozzle 6.

All nozzles 5, 6 and 8 of the gaseous blowing are connected to a common duct 9, into which through tertiary pipes with control valves (not shown) either tertiary air or recirculation gases or their mixture can be supplied.

The nozzles 5 on the rear wall 4 are located from the respective corners of the furnace and from adjacent nozzles 6 at a distance of x, respectively, Op1-0.25 and 0.16-0.4, the width of the furnace.

The number of burners 2 can be even and odd (not shown).

With an odd number of burners 2, one burner is located in the middle of the frontal wall of the furnace, and the others are at an acute angle to the plane of symmetry 3 of the furnace. ),

With an even number of burners of 2 tons, the same ratio of areas of embrasure 7 and nozzle 6 should be at the location of two central burners 2 (located on opposite sides of the plane of symmetry of the firebox) parallel to the side walls. If the voltage of the axes of these burners is parallel to the direction of the th edge burners, then the ratio of the cross-sectional areas of embrasure 7 and nozzle 6 is maximum and equal to four (furnaces of high-capacity boilers).

The furnace works as follows.

Coal dust and secondary air are fed into the furnace through burners 2, tilted in the direction of the cold funnel and to the plane 3 of symmetry of the furnace. Tertiary air and / or recirculation gases are fed through nozzles 5, 6 and 8. Fuel is burned out in a direct-vortex flare. With the proposed arrangement of burners and nozzles of gaseous blowing, outflow of high-temperature flue gases from the central part of the rear wall 4 of the furnace to its side walls occurs, which contributes to the enhancement of the vortex motion of gases with vertical axes of rotation of the side walls. This increases the efficiency of protection of the rear and side walls of the furnace , improves ignition in extreme burners 2, provides a more uniform dispersion of flue gases across the width and depth of the furnace, which, in turn, reduces the temperature of gases yho of de firebox at 50-60 ° C,

Claims (1)

The invention is a vertical prismatic dust-burning furnace containing a cold funnel, frontal torch burners and gas nozzles blowing on the rear wall, symmetrically located relative to the plane of symmetry of the furnace, characterized in that, in order to increase the efficiency of radiation protection of heating surfaces from slagging, the burner and nozzles of gaseous blowing are slotted and arranged vertically at the same level, the axes of the burners are directed towards the cold funnel, for less L J FIG. g V