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Self-cooling iron liquid pretreating spray gun

A molten iron pretreatment, self-cooling technology, applied in the direction of manufacturing converters, etc., can solve the problems of unavoidable uneven expansion of the metal gun core, short service life of the desulfurization lance, limited service life of the lance, etc., to ensure the performance of injection desulfurization. , The effect of improving the performance of injection and avoiding local cracks and spalling

Inactive Publication Date: 2008-10-08
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the metallurgical industry, the spray gun used for the pretreatment of the molten iron furnace before the converter steelmaking is mainly composed of a metal gun core and a refractory gun lining. Composition, the refractory material gun lining is formed by integral casting of castables. The disadvantage is that due to the poor compatibility between the metal gun core of the spray gun and the refractory material gun lining outside the gun core, serious longitudinal cracks burn through and the gun lining Problems such as peeling and gun head falling off, resulting in a shorter actual service life of the desulfurization spray gun
Although, Chinese Patent No. is respectively ZL01251907.3, ZL01252249.X, ZL200320115797.7, ZL03254739.0 and ZL03254800.1 disclosed patented technology has preferably solved the thermal expansion between different types of spray gun metal gun cores and refractory material gun linings Coordination problems, large-scale burn-through of the spray gun, large-area peeling off of the gun lining, and falling off of the gun head have achieved the effect of prolonging the service life of the spray gun in production and application, but there is still thermal expansion between the metal material of the gun core and the refractory material of the gun lining. The existence of matching and reinforcing ribs cannot avoid the uneven expansion of the metal gun core and the local longitudinal cracks caused by it, which limits the further improvement of the service life of the spray gun

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using materials such as No. 45 carbon steel seamless pipe, ordinary carbon steel wire rod, iron-chromium-aluminum heat-resistant wire and other materials, an inverted T-shaped blowing port self-cooling molten iron pretreatment spray gun is made. The structure is as follows: figure 1 shown. No. 45 carbon steel seamless pipes are used to make the main pipe (1), air-cooled pipe (15) and reinforced pipe (8). The end of the pipe (15) is processed with an air-cooled spout (11). Connect the reinforcing tube baffle (12) with threads or welding on the reinforcing tube (8) at the end of the injection port (6) ； Iron-chromium-aluminum heat-resistant metal wire is used to make ring rivets (4), the wire diameter is 4 mm, the diameter of ring rivets (4) is 5 mm smaller than that of the gun body, and the distance between ring rivets (4) is 80 mm . The V-shaped anchor (3) is made of ordinary carbon steel wire rod, the wire diameter is 6 mm, and the V-shaped included angle is 60°; co...

Embodiment 2

[0029] Using materials such as No. 15 carbon steel seamless pipes, ordinary carbon steel wire rods, and iron-chromium-aluminum heat-resistant wires, a self-cooling molten iron pretreatment spray gun with direct blowing at the bottom of the injection port is made. The structure is as follows: image 3 shown. The main pipe (1), air-cooled pipe (15) and reinforced pipe (8) are made of No. 15 carbon steel seamless pipe, and the air-cooled pipe (15) is inserted between the main pipe (1) and the reinforced pipe (8). The end of the pipe (15) is processed with an air-cooled spout (11). Connect the reinforcing tube baffle plate (12) on the reinforcing tube (8) at the end of the blowing port (6); adopt the iron-chromium-aluminum heat-resistant metal wire to make the ring riveting piece (4), wire diameter 4mm, the ring riveting piece ( 4) The diameter is 5mm smaller than the diameter of the gun body, and the distance between the ring rivets (4) is 80mm. Common carbon steel wire rods ar...

Embodiment 3

[0031] Using No. 45 carbon steel seamless pipe, ordinary carbon steel wire rod, iron-chromium-aluminum heat-resistant wire and other materials, a self-cooling molten iron pretreatment spray gun with the injection port of the vaporization chamber is made, and the structure is as follows: Figure 4 shown. Use No. 45 carbon steel seamless pipe to make the main pipe (1), air-cooled pipe (15) and reinforced pipe (8), the air-cooled pipe (15) is set outside the main pipe (1), and the end of the air-cooled pipe (15) Process the air-cooled spout (11). Connect the reinforcing tube baffle plate (12) on the reinforcing tube (8) at the end of the blowing port (6); adopt the iron-chromium-aluminum heat-resistant metal wire to make the ring riveting piece (4), wire diameter 5mm, the ring riveting piece ( 4) The diameter is 5mm smaller than the diameter of the gun body, and the distance between the ring rivets (4) is 100mm. The V-shaped anchor (3) is made of ordinary carbon steel wire rod,...

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Abstract

The invention is about the hot iron pretreatment ejection gun. It can solve the problem of the mismatch of the gun core material and the gun line material. The gun includes: the main duct, the columnar rivet, the V anchorage piece, the ring rivet, the gun line of fireproof material, the spraying mouth, the gun bar, the intensified pipe, the organic coating, the wind cooling duct, the wind cooling jet, the intensified pipe baffle plate, the air intake and the gas nozzle. The gun of the invention has the simple structure and the long life.

Description

technical field [0001] The invention relates to a spray gun for pretreatment of molten iron, in particular to a spray gun for spraying desulfurization, dephosphorization and desiliconization of torpedo tanks or molten iron tanks. Background technique [0002] At present, in the metallurgical industry, the spray gun used for the pretreatment of the molten iron furnace before the converter steelmaking is mainly composed of a metal gun core and a refractory gun lining. Composition, the refractory material gun lining is formed by integral casting of castables. The disadvantage is that due to the poor compatibility between the metal gun core of the spray gun and the refractory material gun lining outside the gun core, serious longitudinal cracks burn through and the gun lining Problems such as peeling and gun head falling off lead to a shorter actual service life of the desulfurization spray gun. Although, Chinese Patent No. is respectively ZL01251907.3, ZL01252249.X, ZL20032011...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/46C21C7/04
Inventor 欧阳德刚罗安智胡清明胡铁山王庆芳陈双全周明石王海青
Owner 武钢集团有限公司
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