CN2384114Y

CN2384114Y - High air temp, long flame low-heat value gas self-preheating nozzle

Info

Publication number: CN2384114Y
Application number: CN99224607U
Authority: CN
Inventors: 刘威; 刘铁成; 王久志; 常桂华
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 1999-07-24
Filing date: 1999-07-24
Publication date: 2000-06-21
Anticipated expiration: 2009-07-24

Abstract

The utility model relates to a self-preheating nozzle of the industrial furnace in the heat engineering equipment, comprising a gas flue standpipe, a heat exchanger, a smokestack, an eductor for squirting the exhaust smoke, an entrance of the combustion supporting wind, an internal and external gas casing of the nozzle, a tube core of the gas and a nozzle tile. The self-preheating nozzle is characterized in that the upper end of the heat exchanger is equipped with a warm-air pipe which connects with the air box installed on the outer shell of the nozzle. The spray head of the nozzle is respectively equipped with an air swirler and a gas swirler. The burner tile in front of the nozzle is the integral structure with the internal layer as the lengthwise burning path for organizing flame and the external layer as the smoke extraction path.

Description

High wind-warm syndrome, long flame, low-heat value gas self-preheating burner

The utility model relates to the self-preheating burner on the industrial furnace in a kind of Thermal Equipment.

At present, the self-preheating burner that generally uses on the industrial furnace, generally be by burner block, heat exchanger, the burner shell, discharge flue is formed, though the self-preheating burner of this structure has certain energy-conservation advantage, but also come with some shortcomings, first air preheating temperature is on the low side, and this is because when combustion air is entered a preheating of heat exchanger by inlet after, forms the dead angle at the burner head when overlapping in entering air, be unfavorable for heat exchange, therefore limited the application of low-heat value gas under the high-temperature technology condition; Two to be burner blocks be made up of interior burner block and outer burner block for it, and two bricks are all having unfavorable factor aspect installation and the maintenance; It three is that the burner head is the bushing type nozzle structure, is unfavorable for the well-mixed completing combustion of air, coal gas, and flame rigidity and length are relatively poor.

The purpose of this utility model provides a kind of air and coal gas of making mixes well, the air preheating temperature height, and the flame of burner ejection is long, and certain rigid is arranged, and is convenient to the high wind-warm syndrome of installing and overhauling, long flame, low-heat value gas self-preheating burner.

The utility model is to realize like this, it comprises the flue standpipe that is positioned at burner top, heat exchanger is installed around the flue standpipe, in the flue riser upper one chimney is installed, spray the smoke evacuation injector and be installed in the side of chimney, be provided with combustion air inlet, the inside and outside flue gas cover of burner at the shell upside of heat exchanger, the burner block composition that is installed in the coal gas tube core in the burner and is positioned at the burner front portion is characterized in that:

A, one warm-air pipe is installed, and is communicated with bellows on being arranged on the burner shell at the downside of heat exchanger;

B, be provided with air cyclone and coal gas cyclone respectively at the shower nozzle place of burner;

C, the burner block that is positioned at the burner front portion are structure as a whole, and internal layer is organized flame as burning gallery, and be outer as the flue gas passing away.

The utility model has the advantages that, owing to adopted said structure to make preheated air through three prognosis, temperature can reach 250～300 ℃, help the application of low-heat value gas under the high-temperature technology requirement condition, the cyclone that on the burner shower nozzle, is provided with, guaranteed that promptly air, coal gas fully mix, also made the flame of ejection have certain length and rigidity simultaneously.

The utility model is described in further detail below in conjunction with accompanying drawing.

Accompanying drawing 1 is a structural representation of the present utility model.

Referring to Fig. 1, the utility model comprises the flue standpipe 8 that is positioned at burner top, heat exchanger 7 is installed around flue standpipe 8, one chimney 11 is installed on the top of flue standpipe 8, for making smoke evacuation smooth and easy, spraying smoke evacuation injector 10 is installed on the axis of chimney 11, between outer cover of heat exchanger and flue standpipe, establish a perforated plate interlayer, shell upside at heat exchanger is provided with combustion air inlet 9, be installed in coal gas tube core 2 in the burner and the burner block 14 that is positioned at the burner front portion, they and the interior cover 4 of flue gas that is arranged on the burner, flue gas overcoat 5 and burner block flue gas suction inlet together constitute a complete smoke evacuation system.The setting of spraying smoke evacuation injector 10 makes and forms negative pressure in the chimney 11, thereby with the flue that the flue gas in the burner hearth forms between the overcoat in burner suction inlet, flue gas, discharges by flue standpipe 8 and chimney 11 again.

Main points of the present utility model are at the downside of heat exchanger 7 warm-air pipe 12 to be installed, and be connected with bellows 13 on being arranged on burner shell 6, when combustion air after combustion air inlet 9 is sent into heat exchanger 7, owing between outer cover of heat exchanger and flue standpipe, establish a perforated plate interlayer, make air with higher jet velocity vertical impact hot side, cold and hot wind forms the jet flow heat convection, finish heat exchange for the first time, enter bellows 13 through warm-air pipe 12 then, through between the circumferential weld of flue gas overcoat 5 and burner shell 6, carrying out the following current heat exchange again with high-temperature flue gas, this moment, air obtained the secondary preheating, exhaust gases passes that forms between interior cover 4 of air inflow flue gas that preheating is good and the gas pipe 2 and high-temperature flue gas be countercurrent flow again, thereby realize three heat exchange, at this moment the air themperature after the preheating can reach 250～300 ℃, has reached the high purpose of preheated air temperature.

For make combustion air better with fuel mix, the flame length of ejection also has certain rigid, the utility model is provided with air cyclone 15 and coal gas cyclone 16 respectively at burner shower nozzle place, coal gas is after coal gas tube core 2 enters burner body, rotate ejection at the shower nozzle place at a certain angle through coal gas cyclone 16, flow into air cyclone 15 with certain angle rotation ejection through the good air of three preheatings in addition, the secondary air body burns on inner edge mixing limit, the tubaeform burning of burner block 14 internal layers tunnel, at last with very fast air-flow ejection burner block, this cyclone structure has promptly guaranteed air, coal gas mixes well, also make the flame of ejection have certain rigid, and the length of flame can reach more than the 3m, satisfied the high wind-warm syndrome requirement of equipment, can save energy 12～15% simultaneously the burner length of flame.In addition because burner block of the present utility model has adopted said structure in design, make abrasion resistance, the heat-resisting quantity of burner block all improve greatly, and can cooperate well with the flue gas overcoat of burner body circle, play and organize flame and the unimpeded bilayer effect of smoke evacuation, be easy for installation and maintenance simultaneously.

Claims

1, a kind of high wind-warm syndrome, long flame, low-heat value gas self-preheating burner, it comprises the flue standpipe that is positioned at burner top, heat exchanger is installed around the flue standpipe, in the flue riser upper one chimney is installed, spray the smoke evacuation injector and be installed in the side of chimney, be provided with combustion air inlet, the inside and outside flue gas cover of burner at the shell upside of heat exchanger, the burner block composition that is installed in the coal gas tube core in the burner and is positioned at the burner front portion is characterized in that:

A, a warm-air pipe (12) is installed, and is communicated with bellows (13) on being arranged on burner shell (6) at the downside of heat exchanger (7);

B, be provided with air cyclone (15) and coal gas cyclone (16) respectively at the shower nozzle place of burner;

C, the burner block (14) that is positioned at the burner front portion are structure as a whole, and internal layer is organized flame as burning gallery, and be outer as the flue gas passing away.