CN2428747Y

CN2428747Y - Immersion-type coal-oxygen spray-gun

Info

Publication number: CN2428747Y
Application number: CN 00238120
Authority: CN
Inventors: 刘浏; 佟溥翘; 高建军; 丁永良; 布焕存; 曾加庆; 米谷明; 齐渊洪; 高峰
Original assignee: Central Iron and Steel Research Institute
Current assignee: Central Iron and Steel Research Institute
Priority date: 2000-06-30
Filing date: 2000-06-30
Publication date: 2001-05-02
Anticipated expiration: 2010-06-30

Abstract

The utility model relates to an immersion-type coal-oxygen spray gun, and belongs to a metallurgy spray gun which is immersed in the slag to blow coal powder and oxygen. The utility model is mainly used for the high-temperature reduction metallurgical process. The utility model is composed of a coal power circular pipe, a primary oxygen pipe, a cooling water jacket, a coal powder and oxygen mixing chamber, a flange, a gun head, etc. The utility model is characterized in that the center of the coal power circular pipe on a gun tail is provided with a secondary oxygen pipe; the pipe diameter ratio of the coal power circular pipe and the secondary oxygen pipe is 15-20; the depth of the secondary oxygen pipe inserted in the coal power circular pipe on the gun tail is 20-50 mm. The utility model improves the combustion efficiency of the coal dust, prevents the pot inversing phenomenon of the slag, avoids clogging the outlet of the spray gun, reduces the gas generation quantity, and improves the exhaust-gas treatment efficiency.

Description

The immersion coal oxygen injection lance

The utility model belongs to the metallurgical lance that immerses coal injection and oxygen in the slag.Be mainly used in the metallurgical process that high temperature reduction is smelted.Utilize the heat release of in high-temperature slag, burning of coal dust and oxygen, improve the bath temperature of smelting process, finish high-temperature smelting process.

Generally, in blast furnace ironmaking, electric furnace steel making and other pyroprocess, utilize preheated air, oxygen enrichment or pure oxygen burning coal dust, for system provides needed heat.Mainly solid or the liquid surface burning in stove of combustion-supporting gas such as coal dust and oxygen.Owing to be subjected to the restriction in ambient temperature and space, the efficiency of combustion of coal dust is low, unburnt coal dust amount height in the gaseous product.Combustion process also produces NO _x, SO _xDeng pernicious gas, contaminated environment.

The metallurgical lance of coal injection and oxygen generally adopts the circumferential weld pipe to lead to oxygen, the water-cooled spray gun structure of the logical coal dust of central tube, and it is to take place easily to pour in down a chimney phenomenon because of the slag that the spray gun pressure fluctuation produces that this structure is used, and the spray gun outlet is stopped up.

The immersion coal oxygen injection lance that the purpose of this utility model is to provide a kind of can improve coal dust firing efficient, prevent slag tank switching phenomenon, avoid the spray gun outlet to stop up.

Based on above-mentioned purpose, the utility model immersion coal oxygen injection lance, it by coal dust endless tube, oxygen hose, cooling jacket, coal dust oxygen mix chamber, a flange, rifle is first-class forms, it is characterized in that: the center at gun breech coal dust endless tube is equipped with the secondary oxygen hose, described coal dust endless tube is 15-20 with the caliber ratio of described secondary oxygen hose, and the degree of depth that described secondary oxygen hose inserts gun breech coal dust endless tube is 20-50mm.

During use, coal injection and oxygen in the high-temperature slag are imbedded in coaloust-oxygen gun rifle body termination, and the rifle termination exposes in the part of high-temperature slag to be protected by the dross layer, thereby reaches normal operating conditions.

The utility model is coal dust and oxygen to be sprayed in the slag burn.A large amount of heats that combustion process produces are absorbed than higher high-temperature slag by thermal capacitance value on every side.Because the winding-up process causes good molten bath mixing effect, the heat exchange of slag and surrounding environment is abundant, has improved the efficient of coal dust firing, makes the molten bath quick heating, thermal efficiency height.Because the combustion adjuvant of coal dust firing is an oxygen, the gaseous product of process of coal combustion can filter out wherein contained most of harmful components (NOx reduction by 90%, SOx reduction by 96% etc.) and dust (reducing by 80%) when passing certain thickness high-temperature slag.The exhausted air quantity that the exhausted air quantity of overflowing from the molten bath produces when comparing with air or oxygen-enriched combusting greatly reduces, and has reduced the exhaust-gas treatment amount.

The utility model adopts the logical oxygen of circumferential weld pipe, the water-cooled spray gun structure of the logical coal dust of central tube.For improving penetration depth and the stirring capacity of coal oxygen jet to the molten bath, oxygen jet is from the spout ejection of convergent-divergent channel form.For preventing the spray gun outlet to be stopped up because of the issuable slag of spray gun pressure fluctuation pours in down a chimney phenomenon, in appropriate location, spray gun exit one oxygen jet induction apparatus is installed, guarantee that coal dust and oxygen have bigger muzzle velocity and impulsive force when ejection.The utility model secondary oxygen is 3-5 with the speed outlet ratio of coal oxygen gas mixture.

Compared with prior art, has following advantage: improve coal dust firing efficient and reduce NOx, SOx and dust content in the combustion gas product, reduce gas generating amount, improve exhaust-gas treatment efficient, reduce the investment of waste gas treatment equipment, prevent slag tank switching phenomenon, avoid the spray gun outlet to stop up.

Now in conjunction with the accompanying drawings spray gun structure of the present utility model is described further.

Fig. 1 is the utility model coal oxygen injection lance overall structure schematic diagram.

Fig. 2 is the utility model coal oxygen injection lance working state schematic representation.

1 is the coal dust endless tube among Fig. 1, Fig. 2, and 2 is secondary oxygen aditus laryngis, and 3 is an oxygen air inlet, 4 is return pipe, 5 is coal dust oxygen mix chamber, and 6 are the fixing flange of rifle body, and 7 is rifle body cooling jacket, 8 is coaloust-oxygen gun rifle head, 9 is an oxygen hose, and 10 is the secondary oxygen hose, and 11 is coal pipe, 12 is body of heater, and 13 is slag.

As seen from Figure 2: in working order down, fixing rifle body and body of heater 12 by mounting flange 6.Cooling jacket 7 connects outer circulation water lines, water quench rifle body.Coal dust and secondary oxygen enter coal dust endless tube 1 and an oxygen hose 9 respectively, and by rifle body outlet ejection, one time oxygen enters the oxygen pipe one time by external main oxygen tube road again.Secondary oxygen pipe 10 is fixed on the center of coal dust endless tube 1, and its exit is controlled separately by external oxygen branch road in the appropriate location of rifle body outlet.Coal injection and oxygen in the high-temperature slag are imbedded in coaloust-oxygen gun rifle body termination, and the rifle termination exposes in the part of high-temperature slag to be protected by the dross layer, thereby reaches normal operating conditions.

Claims

1, immersion coal oxygen injection lance, it by coal dust endless tube, oxygen hose, cooling jacket, coal dust oxygen mix chamber, a flange, rifle is first-class forms, it is characterized in that: the center at gun breech coal dust endless tube is equipped with the secondary oxygen hose, described coal dust endless tube is 15-20 with the caliber ratio of described secondary oxygen hose, and the degree of depth that described secondary oxygen hose inserts gun breech coal dust endless tube is 20-50mm.