CN2384121Y

CN2384121Y - Layer combustion boiler adjustable air efficient burner

Info

Publication number: CN2384121Y
Application number: CN 99221314
Authority: CN
Inventors: 马春元; 吕明新; 赖艳华; 徐夕仁; 李京; 阎云涛
Original assignee: Thermal Energy And Environment Protection Engineering Technology Research Center
Current assignee: Thermal Energy And Environment Protection Engineering Technology Research Center
Priority date: 1999-06-18
Filing date: 1999-06-18
Publication date: 2000-06-21
Anticipated expiration: 2009-06-18

Abstract

The utility model relates to a bluff body air adjustable high efficiency burner for a layer combustion boiler, which comprises a front arch 1, a coal bucket 2, a coal gate 3, a grate 4, an air supply box 5, and a rear arch 8. The utility model is characterized in that the front end of the rear arch 8 is appended with a bluff body air adjustor 7 which is provided with an air outlet, and the middle part of the bluff body air adjustor is a cavity which is communicated with the air supply box 5 or a steam header through a ventilation pipe 6; smoke gas in a hearth is strongly disturbed by air which is ejected by the bluff body air adjustor 7 and the air outlet thereof; the rear part of the bluff body air adjustor 7 forms a high-temperature smoke gas eddy zone. Therefore, the utility model has the advantages that the temperature at the front of the hearth is increased and the combustion efficiency is enhanced.

Description

A kind of grate firing boiler bluff body is transferred wind efficient burning device

The utility model relates to a kind of grate firing boiler bluff body and transfers wind efficient burning device.

In general grate firing boiler, coal drops down onto in coal bunker on the fire grate, regulates coal-supplying amount by the lifting of coal flashboard, and the coal on the fire grate is motion from front to back under the effect of fire grate, finishes the drying of coal, the overall process of igniting, burning.The air feed case of fire grate below is at the comprehensive air feed of fire grate length direction.The fire grate leading portion is the dry ignition zone of coal, and this moment, coal volatilized a large amount of flammable volatile matters, because the furnace front flue-gas temperature is lower, makes the combustible component incomplete combustion in the flue gas form carbon black, causes the boiler over-emitting black exhaust, has also reduced efficiency of combustion simultaneously.

The purpose of this utility model is that the temperature of raising furnace front is strengthened mixing, and improves the burning of grate firing boiler, improves the efficiency of combustion of boiler.

Grate firing boiler bluff body of the present utility model is transferred wind efficient burning device, comprises coal bunker, coal flashboard, fire grate, face arch, rear arch, air feed case, is hung with the bluff body air register at the rear arch front end.

Grate firing boiler bluff body of the present utility model is transferred wind efficient burning device, and there is air outlet at its bluff body air register edge, and the middle part is a cavity, and is communicated with air feed case or steam header by ventilation duct.

Grate firing boiler bluff body of the present utility model is transferred wind efficient burning device, owing to be hung with the bluff body air register at the rear arch front end, make burner hearth rear portion high-temperature flue gas the time through the bluff body air register, produce stronger disturbance, and, strengthened having improved the temperature of furnace front to the disturbance of furnace front with to radiation dry, the coal seam, ignition zone in formation high temperature eddy current district, bluff body rear portion, make the combustible component completing combustion at high temperature in the flue gas, improved the efficiency of combustion of boiler.

The utility model is communicated with the bluff body air register owing to ventilation duct with air feed case or steam header, air or steam and air mixture are penetrated by the air outlet of bluff body air register, further strengthened disturbance, improved the temperature of furnace front, improved the efficiency of combustion of boiler the burner hearth flue gas.

Fig. 1, Fig. 2, Fig. 3 are the modular design figure that a kind of grate firing boiler bluff body is transferred wind efficient burning device, and Fig. 1 is a front view, and Fig. 2 is a left view, and Fig. 3 is its bluff body air register vertical view.Below in conjunction with accompanying drawing the utility model is described in detail:

A kind of grate firing boiler bluff body is as shown in Figure 1 and Figure 2 transferred wind efficient burning device, comprises face arch 1, coal bunker 2, coal flashboard 3, fire grate 4, air feed case 5, ventilation duct 6, bluff body air register 7, rear arch 8.Air register 7 is installed on rear arch 8 front ends, and the length of stretching out downwards accounts for rear arch 8 front ends to 1/5～1/3 of fire grate 4 distances, and width accounts for 1/5～1/3 of fire grate 4 width; As shown in Figure 3, bluff body air register 7 cross sections are obtuse triangle, and there is air outlet 9 at the edge, and the middle part is a cavity 10, and are communicated with air feed case 5 by ventilation duct 6; By flow dynamics analysis as can be known, cross section is the bluff body of obtuse triangle, the face at its obtuse angle edge place is the windward side, the bluff body stream field has the strong disturbance effect, and in formation vortex, bluff body rear portion, burner hearth rear portion high-temperature flue gas is under the effect of rear arch 8, flow to furnace front, during through bluff body air register 7, produce stronger disturbance, and form the high temperature eddy current district at bluff body air register 7 rear portions, strengthened to the disturbance of furnace front with to drying, the hyperthermia radiation in coal seam, ignition zone, improve the temperature of furnace front, made the combustible component completing combustion at high temperature in the flue gas, improved the efficiency of combustion of boiler; After part air in the air feed case 5 enters bluff body air register 7 by ventilation duct 6, penetrate by air outlet, further strengthened disturbance, improved the temperature of furnace front the burner hearth flue gas, improved the efficiency of combustion of boiler, played cooling effect simultaneously bluff body air register 7; If bluff body air register 7 is communicated with steam header, the high steam in the steam header sprays into burner hearth by bluff body, can play the reinforcement carbon grain combustion, eliminates the effect of black smoke; Eddy current behind the bluff body has centrifugation to particle, makes uncombusted coal grain isolate and drop on the fire grate and burns away, and improves efficiency of combustion.Because bluff body air register 7 is in hot environment, need select for use exotic material to make, as heat resisting steel.The utility model can be used for the transformation and the manufacturing of traveling-grate stoker, reciprocal grate or other grate firing fire grates.

Claims

1. a grate firing boiler bluff body is transferred wind efficient burning device, comprises coal bunker (2), coal flashboard (3), fire grate (4), face arch (1), rear arch (8), air feed case (5), it is characterized in that: be hung with bluff body air register (7) at rear arch (8) front end.

2. transfer wind efficient burning device as claim 1 described a kind of grate firing boiler bluff body, it is characterized in that: there is air outlet at bluff body air register (7) edge, and the middle part is a cavity, and is communicated with air feed case (5) or steam header by ventilation duct (6).