CN111578715A

CN111578715A - Immersed spray gun and side-blown converter

Info

Publication number: CN111578715A
Application number: CN202010390628.2A
Authority: CN
Inventors: 许良; 彭思尧
Original assignee: China ENFI Engineering Corp
Current assignee: China ENFI Engineering Corp
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2020-08-25

Abstract

The invention discloses an immersed spray gun which is arranged on a side-blown furnace body and works below a slag surface, the immersed spray gun is formed by assembling two single guns in a left-right adjacent spaced mode, the front ends of the two single guns are close to each other, the rear ends of the two single guns are far away from each other, one single gun of the two single guns is used for spraying fuel into the side-blown furnace, the other single gun of the two single guns is used for spraying oxygen-enriched air into the side-blown furnace, hollow through channels are arranged in the two single guns, and medium inlets which are communicated with the hollow through channels and form a Y shape with the hollow through channels are further arranged at the tail parts of the two single guns. The immersed spray gun is convenient to clean, simple in structure and simple to manufacture and process. The invention also discloses a side-blown converter.

Description

Immersed spray gun and side-blown converter

Technical Field

The invention relates to the technical field of side-blown furnaces, in particular to an immersed spray gun and a side-blown furnace.

Background

At present, oxygen-enriched side-blown smelting is more and more emphasized as an intensified molten pool smelting technology, and the oxygen-enriched side-blown smelting technology gradually replaces the original smelting technology and secondary material treatment technology to become one of the most promising technologies of non-ferrous metal smelting and secondary material treatment. Because the oxygen-enriched side-blown smelting process has short flow, good air tightness, good environmental protection and investment saving, the bath-blowing smelting method gradually occupies a main position in the smelting and secondary material treatment of nonferrous metals. With the rapid development of the oxygen-enriched side-blown smelting process, the application of the oxygen-enriched side-blown smelting process in the fields of concentrate of metals such as zinc, lead, antimony, tin, copper, nickel and the like and related secondary material treatment is gradually promoted at present.

The side-blown smelting furnace is used as a core device of the oxygen-enriched side-blown smelting process, and the structure of the side-blown smelting furnace is very important and is the key of the development progress of the oxygen-enriched side-blown smelting process. The lance is used as a core component of the side-blown smelting furnace, and the service life and the efficiency of the lance basically determine the operation rate and the capacity of the furnace.

In the side-blown smelting process, in order to stir the raw materials in the furnace, accelerate the speed of material melting and oxidation-reduction reaction and improve the smelting efficiency, a mode of blowing oxygen-enriched air into the furnace to stir the melt and participating in the reaction process is widely adopted. The structural design of the lance which works below the liquid level of the molten bath is of great importance.

The side-blown submerged combustion molten pool smelting technology adopts a spray gun to directly spray pulverized coal, natural gas, coal gas or fuel oil and other fuels into a furnace, directly burns in a molten pool to release heat, supplements a large amount of heat needed in the furnace, so that a heat supplementing mode is more direct and efficient, and is more beneficial to maintaining heat balance of a furnace kiln. Such lances generally employ a double pipe structure to separate fuel and oxygen-enriched air, but the lance structure is complicated and difficult to maintain. In order to ensure that the lance head is not blocked, the lance head generally adopts a micropore structure, the flow velocity and the pressure of a medium are improved, although the condition that the lance head is blocked still exists, the operation efficiency of the furnace kiln is influenced, the liquid level of a melt in the furnace is required to be reduced to be lower than a spray gun, and then the spray gun is manually disassembled, cleaned or replaced. When the spray gun uses a large amount of fuel and is in high oxygen enrichment combustion, the heat intensity of the outlet area of the spray gun is extremely high, the burning loss of the gun head is serious, and the gun head is easy to block. When solid fuel such as pulverized coal is used, the nozzle head is easily clogged with the pulverized coal due to the microporous structure of the nozzle head. The lance of this construction is not conducive to increased lance capacity.

The Vancov type oxygen-enriched side-blowing process adopts oxygen-enriched air injected into the furnace, and simultaneously adds lump coal in the raw materials as fuel and reducing agent, thus solving the problem of insufficient heat. The process needs a large amount of lump coal in treating non-heating materials, has low combustion efficiency and is difficult to maintain the heat balance in the furnace. The spray gun is generally large in caliber, low in medium pressure and easy to maintain, and the problem that the gun head is blocked also exists. Under the condition that the gun head is blocked, the slag surface does not need to be reduced, the spray gun is cleaned manually by using a steel chisel, and the operation is simpler. Due to the requirements of the smelting process, the structural design reasons of the spray gun and the characteristics of medium pressure, the oxygen-enriched concentration of the spray gun is limited, and the over-high oxygen concentration is not beneficial to prolonging the service life of the spray gun and the furnace body and influencing the melt stirring.

The prior art has a spray gun 100 of a side-blown submerged combustion molten bath metallurgical furnace, as shown in fig. 3, which comprises an outer spray pipe, an inner spray pipe, a plugging piece and a plug-in self-locking piece, wherein the outer spray pipe is internally provided with a combustion-supporting gas inlet, a combustion-supporting gas outlet and a socket; the inserting self-locking piece has a self-locking closing function and is arranged at the socket of the outer spray pipe; interior spray tube has medium import, medium spout and medium clearance mouth, and interior spray tube detachably pegs graft on pegging graft from the latch fitting, and the one end that has the medium spout on the interior spray tube stretches into outer spray tube through the socket, and interior spray tube deviates from to peg graft and closes with the shutoff socket from the latch fitting auto-lock when pegging graft from the latch fitting, and the shutoff is installed in order to open or close medium clearance mouth on the spray tube including. The sleeve type spray gun is improved by the spray gun, cleaning means are added, the blockage of a pipeline can be cleaned, but the blockage cleaning problem is complex, the operation is inconvenient, the structure of the spray gun is complex, the gun body is long, and the manufacturing and processing difficulties are high.

The prior art also has a side-blown converter 200, as shown in fig. 4, which comprises a furnace body 1, a first lance 2 and a second lance 3, wherein the furnace body 1 has a molten bath therein; the first spray gun 2 is arranged on the furnace body 1 and is used for spraying fuel into the molten pool; the second spray gun 3 is arranged on the furnace body 1 and is used for spraying combustion improver into the molten pool. When the multi-channel spray gun works, fuel gas, combustion air and oxygen are directly combusted in a molten pool area at the front end of the spray gun, the temperature can reach 1600-plus 1800 ℃, the spray gun seat is damaged and abraded under the condition of overhigh heat intensity, the spray gun is burnt, the side wall of the furnace body 1 is damaged, and the normal operation and the furnace life are influenced. The multi-channel spray gun is divided into a fuel spray gun and an oxygen-enriched spray gun which are respectively arranged at two sides of the furnace body 1, the fuel combustion position is positioned in the middle of a molten pool, and a high-temperature area is formed in the middle of the molten pool, so that the overhigh temperature of the front end area of the spray gun is avoided, the service life of the spray gun can be effectively prolonged, and the burning loss of furnace bricks is avoided. Due to the design, the over-high temperature of the front end area of the spray gun can be avoided, and the burning loss of the furnace wall of the spray gun area is reduced. However, the arrangement ignores the problem of unbalanced stirring caused by different types, flow rates and pressures of media on two sides, and may cause inconsistent pressure, temperature and melt erosion on the furnace walls on the two sides.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide an immersion type spray gun which is convenient to clean, simple in structure and simple to manufacture and process.

According to the embodiment of the first aspect of the invention, the submerged lance is used for being installed on a side-blown furnace body and working below a slag surface, the submerged lance is formed by assembling two single lances which are adjacent to each other at a distance from each other, the front ends of the two single lances are close to each other, the rear ends of the two single lances are far away from each other, one single lance of the two single lances are used for spraying fuel into the side-blown furnace, the other single lance of the two single lances is used for spraying oxygen-enriched air into the side-blown furnace, the two single lances are provided with hollow through channels, and the tail parts of the two single lances are further provided with medium inlets which are communicated with the hollow through channels and form a Y shape with the hollow through channels.

According to the submerged lance of the embodiment of the first aspect of the invention, the submerged lance is arranged on the furnace body of the side-blown furnace and works below the slag surface, when fuel needs to be conveyed into the side-blown furnace, the fuel enters the hollow through channel from the medium inlet of one single lance of the submerged lance and is sprayed into the side-blown furnace from the front end of the hollow through channel, and when oxygen-enriched air needs to be conveyed into the side-blown furnace, the oxygen-enriched air enters the hollow through channel from the medium inlet of the other single lance of the submerged lance and is sprayed into the side-blown furnace from the front end of the hollow through channel.

According to the submerged lance disclosed by the embodiment of the first aspect of the invention, the submerged lance is arranged on the side-blown furnace body and works below the slag surface, can provide oxygen-enriched air and fuel for the side-blown furnace and can provide power for stirring a molten pool; because two single guns are pairwise combined to form an immersed spray gun, and the two single guns are respectively provided with the hollow through channel and the medium inlet connected with the hollow through channel, no complex structure exists, the complex structure of the sleeve type spray gun in the prior art is avoided, the manufacturing and the processing are convenient, the single gun is not easy to block, even if the single gun is blocked, the steel drill can be used for cleaning the blocking object in the single gun, and the cleaning is convenient. In addition, the submerged lance is formed by assembling two single lances which are adjacently arranged at left and right, wherein the front ends of the two single lances are close to each other, and the rear ends of the two single lances are far away from each other, so that a molten pool area has certain unevenness only in a small range, and the properties of most of the molten pool area are basically consistent, and other adverse reactions are not caused.

According to an embodiment of the first aspect of the present invention, each of the single guns includes a head nozzle, an intermediate gun holder, a tail connecting section, and a plugging member, wherein a rear end of the head nozzle is detachably connected to a front end of the intermediate gun holder, a rear end of the intermediate gun holder is detachably connected to a front end of the tail connecting section, the head nozzle, the intermediate gun holder, and the tail connecting section together define the hollow through passage, the tail connecting section defines the medium inlet, and the plugging member detachably plugs a rear end of the hollow through passage.

According to a further embodiment of the first aspect of the present invention, the head nozzle is made of a high temperature resistant alloy.

According to a further embodiment of the first aspect of the invention, the intermediate lance holder is adapted to be secured to the side-blown converter shaft by bolts.

According to a further embodiment of the first aspect of the present invention, the blocking piece is one or a combination of two of a self-blocking steel ball, a nut and a valve.

According to some embodiments of the first aspect of the present invention, the axes of two of the single lances form an angle of 0 ° to 30 ° and meet at a point within the side-blown vessel.

According to some embodiments of the first aspect of the present invention, the front end of the hollow through channel forms a constriction.

According to some embodiments of the first aspect of the present invention, the medium flow velocity at the outlet of the hollow through channel is 100-500 m/s.

The invention also provides a side-blown converter in a second aspect.

According to a second aspect of the embodiment of the invention, the side-blown converter comprises:

a furnace body;

a plurality of submerged lances according to any one of the embodiments of the first aspect, mounted on opposite sides of the furnace shaft in spaced apart relation.

According to the side-blown converter of the embodiment of the second aspect of the invention, the plurality of submerged lances are arranged on the two opposite sides of the furnace body at intervals, so that the submerged lances are simple in structure, simple to manufacture and process and convenient to clean, and therefore the working efficiency of the side-blown converter can be effectively improved.

According to an embodiment of the second aspect of the invention, a plurality of lance zone lance seats are provided on the furnace shell in one-to-one correspondence with the plurality of submerged lances; each spray gun zone spray gun seat is composed of two independent single spray gun seats, two single spray gun seats in each spray gun zone spray gun seat are composed of lining refractory bricks and a copper water jacket which are sequentially arranged from the inside of the side-blown converter to the outside of the side-blown converter, and two single spray gun seats in each spray gun zone spray gun seat respectively define insertion holes into which two single spray guns of each submerged spray gun are correspondingly inserted; the two single guns of each submerged spray gun are respectively and correspondingly inserted into the two insertion holes in the spray gun seat of each spray gun area and are fixed with the furnace body.

According to a further embodiment of the second aspect of the present invention, the plurality of submerged lances are submerged lances according to the further embodiment of the first aspect of the present invention, the head nozzles of the two single lances of each submerged lance are respectively and correspondingly inserted into the two insertion holes in the lance base of each lance area, and the middle lance bases of the two single lances of each submerged lance are respectively fixed on the outer side surfaces of the corresponding lance base through the bolts.

According to some embodiments of the second aspect of the present invention, two of the single lances of the submerged lance are arranged horizontally.

According to some embodiments of the second aspect of the present invention, the forward ends of two of the single lances in the submerged lance are arranged inclined downwardly, the angles of inclination of the two single lances being the same.

According to an embodiment of the second aspect of the invention, the two single guns are angled from 0 ° to 5 ° from the horizontal.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a submerged lancing according to an embodiment of the first aspect of the present invention.

FIG. 2 is a schematic structural view of a side-blown converter according to an embodiment of the second aspect of the present invention.

FIG. 3 is a schematic view of the structure of a lance of a side-blown submerged combustion bath metallurgical furnace of the prior art.

FIG. 4 is a schematic view showing the structure of a side-blown furnace of the prior art.

Reference numerals:

submerged lance 1000

Plugging piece 14 for connecting section 13 at tail part of middle gun base 12 of head spray head 11 of single gun 1

Self-plugging steel ball 141 nut 142 hollow straight-through channel 15 medium inlet 16

Side-blown converter 2000

Furnace shaft 2

Spray gun zone spray gun base 3 single gun spray gun base 31 copper water jacket 32 lining firebrick 33

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A submerged lance 1000 according to an embodiment of the invention is described below with reference to fig. 1 to 2.

As shown in fig. 1 and 2, the submerged lance 1000 according to the embodiment of the first aspect of the present invention is configured to be installed on a furnace body 2 of a side-blown converter 2000 and work below a slag surface, the submerged lance 1000 is configured by two single lances 1 which are adjacently spaced from each other in a left-right direction, front ends of the two single lances 1 are close to each other, rear ends of the two single lances 1 are far away from each other, one single lance 1 of the two single lances 1 is used for injecting fuel into the side-blown converter 2000, the other single lance 1 of the two single lances 1 is used for injecting oxygen-enriched air into the side-blown converter 2000, the two single lances 1 are provided with a hollow through passage 15, and tail portions of the two single lances 1 are further provided with a medium inlet 16 which is communicated with the hollow through passage 15 and forms a Y shape with the hollow through passage 15.

According to the submerged lance 1000 of the first aspect of the present invention, the submerged lance 1000 is installed on the furnace body 2 of the side-blown furnace 2000 and works below the slag surface, when it is required to feed fuel into the side-blown furnace 2000, the fuel enters the hollow through-channel 15 from the medium inlet 16 of one single lance 1 of the submerged lance 1000 and is injected into the side-blown furnace 2000 from the front end of the hollow through-channel 15, and when it is required to feed oxygen-enriched air into the side-blown furnace 2000, the oxygen-enriched air enters the hollow through-channel 15 from the medium inlet 16 of the other single lance 1 of the submerged lance 1000 and is injected into the side-blown furnace 2000 from the front end of the hollow through-channel 15.

According to the submerged lance 1000 of the first aspect of the present invention, the submerged lance 1000 is installed on the furnace body 2 of the side-blown furnace 2000 and works below the slag surface, and can provide oxygen-enriched air and fuel for the side-blown furnace 2000 and power for stirring a molten pool; because two single guns 1 are pairwise in a group to form the submerged spray gun 1000, and the two single guns 1 are respectively provided with the hollow through channel 15 and the medium inlet 16 connected with the hollow through channel 15, no complex structure exists, the complex structure of a sleeve type spray gun in the prior art is avoided, the manufacturing and the processing are convenient, the single gun 1 is not easy to block, even if the single gun 1 is blocked, the steel drill can be used for cleaning the blocking objects in the single gun 1, and the cleaning is convenient. In addition, the submerged lance 1000 is assembled by two single lances 1 which are adjacently spaced right and left, and the front ends of the two single lances 1 are close to each other and the rear ends are far away from each other, so that the molten bath area has a certain unevenness only in a small range, and the properties of the vast majority of the molten bath area are substantially consistent, thereby causing no other adverse reactions.

It should be noted that one single lance 1 of the two single lances 1 is used for injecting fuel into the side-blown converter 2000, and the fuel may be natural gas, coal gas, pulverized coal, fuel oil, or the like; the other single lance 1 of the two single lances 1 is used for spraying oxygen-enriched air into the side-blown converter 2000, the concentration of the oxygen-enriched air is 20-99%, and the other single lance 1 of the two single lances 1 can also be used for providing combustion-supporting gas such as compressed air, oxygen and the like for the side-blown converter 2000.

According to an embodiment of the first aspect of the present invention, each single gun 1 comprises a head spray head 11, an intermediate gun holder 12, a tail connecting section 13 and a blocking piece 14, wherein the rear end of the head spray head 11 is detachably connected with the front end of the intermediate gun holder 12, the rear end of the intermediate gun holder 12 is detachably connected with the front end of the tail connecting section 13, the head spray head 11, the intermediate gun holder 12 and the tail connecting section 13 together define a hollow through channel 15, the tail connecting section 13 defines a medium inlet 16, and the blocking piece 14 is detachably blocked at the rear end of the hollow through channel 15. It can be understood that each single gun is designed in a split structure, the rear end of the head spray head 11 is detachably connected with the front end of the middle gun base 12, and the rear end of the middle gun base 12 is detachably connected with the front end of the tail connecting section 13, for example, the rear end of the head spray head 11 and the front end of the middle gun base 12 can be connected by threads, and the rear end of the middle gun base 12 and the front end of the tail connecting section 13 can be connected by flanges, and the middle gun base 12 and the tail connecting section 13 have long service lives and strong interchangeability, so that each single gun 1 has good interchangeability, and the service life of the submerged spray gun 1000 is prolonged; the head spray head 11, the middle gun seat 12 and the tail connecting section 13 jointly define a hollow through channel 15, the structure is simple, and the blockage can be cleaned conveniently by steel drill; the end connecting section 13 defines a media inlet 16 so that oxygen-enriched air or fuel can be fed into the side-blown converter 2000 through the media inlet 16; the plugging piece 14 is detachably plugged at the rear end of the hollow through channel 15, when a single gun needs to be cleaned, the plugging piece can be detached, a steel chisel is inserted into the hollow through channel to clean the plug, when the single gun does not need to be cleaned, the plugging piece is plugged at the rear end of the hollow through channel, and medium leakage in the side-blown furnace 2000 is avoided.

According to a further embodiment of the first aspect of the present invention, the head nozzle 11 is made of a high temperature resistant alloy. Thus, the head nozzle 11 can effectively resist high-temperature burning loss, and the service life is prolonged.

According to a further embodiment of the first aspect of the invention, the intermediate lance holder 12 is adapted to be bolted to the side-blown converter 2000 shaft 2. Thus, the submerged lance 1000 can be fixedly mounted to the side-blown converter 2000 shaft 2.

According to a further embodiment of the first aspect of the present invention, the blocking piece 14 is one or two combinations of a self-blocking steel ball 141, a nut 142 and a valve. Thus, the medium leakage in the side-blown converter 2000 can be effectively avoided, the structure is simple and reliable, and meanwhile, the immersed lance 1000 can be cleaned more conveniently on line.

It should be noted that, as shown in fig. 1, the blocking piece 14 is formed by combining two types of self-blocking steel balls 141 and nuts 142 in series, and the structure is simpler and more reliable.

According to some embodiments of the first aspect of the present invention, the axes of the two single lances 1 form an angle of 0 ° to 30 ° and meet at a point in the side-blown lance 2000. It can be understood that the included angle between the axes of the two single guns 1 is reasonable, the high-temperature zone can move towards the inside of the molten pool and be far away from the furnace wall on the first aspect, the furnace lining and the water jacket can be effectively protected, and the combustion efficiency of fuel can be ensured on the second aspect, so that the incomplete reaction of the fuel is avoided.

According to some embodiments of the first aspect of the present invention, the front end of the hollow through channel 15 forms a constriction. Therefore, the charging speed of the oxygen-enriched air and the fuel can be improved, and the blockage of the spray gun is prevented.

According to some embodiments of the first aspect of the present invention, the medium flow velocity at the outlet of the hollow through channel 15 is 100-500 m/s. This can further prevent the occurrence of clogging of the lance.

According to the submerged lance 1000 of the first aspect of the present invention, when the submerged lance 1000 is working normally, the self-plugging steel ball 141 in the plugging member 14 is plugged naturally, the nut 142 is tightened to prevent the medium in the side-blown converter 2000 from leaking, one of the two single branch lances 1 sprays fuel into the side-blown converter 2000, the other of the two single branch lances 1 sprays oxygen-enriched air into the side-blown converter 2000, the molten bath is combusted and releases heat after a short distance, and an ultra-high temperature region is formed inside the molten bath to prevent the temperature of the front end region of the submerged lance 1000 from being too high, so that the service life of the submerged lance 1000 can be effectively prolonged, the copper water jacket 32 and the lining 33 are prevented from being damaged, and the front ends of the two single branch lances 1 are close to each other, so that the molten bath region has a certain unevenness only in a small range, and most properties of the molten bath region are substantially consistent, thereby causing no other adverse reactions; when the single gun 1 for spraying oxygen-enriched air into the side-blown converter 2000 has a blockage problem, the nut 142 of the single gun 1 with the blockage problem is opened, a steel chisel is used for direct dredging, and the normal production of the side-blown converter 2000 is not affected; when the immersed lance 1000 is burnt and damaged, and the use is affected, the slag surface needs to be reduced, the immersed lance 1000 is exposed, and the immersed lance 1000 is temporarily detached and replaced.

The second aspect of the present invention also provides a side-blown furnace 2000.

As shown in fig. 1 and 2, a side-blown converter 2000 in accordance with an embodiment of the second aspect of the present invention includes a furnace body 2 and a plurality of submerged lances 1000, each submerged lance 1000 being a submerged lance 1000 in accordance with any one of the embodiments of the first aspect, the submerged lances 1000 being mounted on opposite sides of the furnace body 2 in a spaced relationship.

According to the side-blown converter 2000 of the embodiment of the second aspect of the present invention, by installing the plurality of submerged lances 1000 at intervals on the opposite sides of the furnace shell 2, the submerged lances 1000 have a simple structure, are easy to manufacture and process, and are convenient to clean, and thus, the working efficiency of the side-blown converter 2000 can be effectively improved; the submerged lance 10000 is highly operable and can be implemented by slightly modifying the existing side-blown converter 2000.

According to an embodiment of the second aspect of the present invention, the furnace body 2 is provided with a plurality of lance zone lance holders 3 corresponding to the plurality of submerged lances 1000 one to one; each spray gun zone spray gun seat 3 is composed of two independent single spray gun seat 31, the two single spray gun seats 31 in each spray gun zone spray gun seat 3 are both composed of lining refractory bricks 33 and copper water jackets 32 which are sequentially arranged from the inside of the side-blown converter 2000 to the outside of the side-blown converter 2000, and the two single spray gun seats 31 in each spray gun zone spray gun seat 3 respectively define insertion holes for the corresponding insertion of the two single spray guns 1 of each submerged spray gun 1000; the two single lances 1 of each submerged lance 1000 are correspondingly inserted into two insertion holes in the lance base 3 of each lance zone and fixed to the furnace shell 2. It will be appreciated that the submerged lance 1000 can be conveniently mounted and dismounted by providing the lance zone lance holder 3 on the shaft 2; each spray gun area spray gun seat 3 is composed of two independent single spray gun seat 31, the two independent single spray gun seat 31 have the same shape structure size, the copper water jacket 32 is convenient to replace and manufacture, and the interchangeability is strong; two single lance holders 31 in each lance area lance holder 3 are respectively composed of a copper water jacket 32 and a lining refractory brick 33 which are sequentially arranged from the inside of the side-blown converter 2000 to the outside of the side-blown converter 2000, the copper water jacket 32 adopts circulating water to protect the submerged lance 1000 and the lining refractory brick 33, the problem that the lining refractory brick 33 is easily burnt is effectively solved, and under the condition that the lining refractory brick 33 is thinned, slag can be hung to protect the submerged lance 1000, so that the service life of the submerged lance 1000 is greatly prolonged.

According to a further embodiment of the second aspect of the present invention, the plurality of submerged lance 1000 are the submerged lance 1000 according to the further embodiment of the first aspect of the present invention, the head spray heads 11 of the two single lances 1 of each submerged lance 1000 are respectively and correspondingly inserted into the two insertion holes in the lance base 3 of each lance zone, the middle lance base 12 of the two single lances 1 of each submerged lance 1000 is respectively fixed on the outer side surface of the corresponding lance base 3 by bolts, it can be understood that the head spray heads 11 of the two single lances 1 of each submerged lance 1000 are respectively and correspondingly inserted into the two insertion holes in the lance base 3 of each lance zone, so that the side-blown converter 2000 has a reasonable structure and can fix the head spray heads 11 of the two single lances 1 of each submerged lance 1000; the middle gun bases 12 of the two single guns 1 of each immersed type spray gun 1000 are respectively fixed on the outer side surfaces of the corresponding spray gun bases 3 through bolts, and the rear end of the head spray head 11 is detachably connected with the front end of the middle gun base 12, and the rear end of the middle gun base 12 is detachably connected with the front end of the tail connecting section 13, so that the immersed type spray guns 1000 can be reliably fixed with the spray gun bases 3 in a plurality of spray gun areas in a one-to-one correspondence mode.

According to some embodiments of the second aspect of the present invention, two single lances 1 in the submerged lance 1000 are arranged horizontally. It can be understood that, according to the practical situation, the two single lances 1 in the submerged lance 1000 may be horizontally arranged, so that, on one hand, the high temperature zone may be moved toward the inside of the molten bath and away from the furnace wall of the side-blown converter 2000, thereby effectively protecting the copper water jacket 32 and the lining refractory bricks 33, and on the other hand, the combustion efficiency of the fuel may be ensured, thereby avoiding incomplete reaction of the fuel.

According to some embodiments of the second aspect of the present invention, the front ends of the two single lances 1 in the submerged lance 1000 are arranged to be inclined downward, and the inclination angles of the two single lances 1 are the same. It can be understood that, according to the actual situation, the two single lances 1 of the submerged lance 1000 may be arranged with their front ends inclined downward, so that, on the one hand, the high temperature zone may move toward the inside of the molten bath and away from the furnace wall of the side-blown converter 2000, thereby effectively protecting the copper water jacket 32 and the lining refractory bricks 33, and, on the other hand, the combustion efficiency of the fuel may be ensured, thereby avoiding incomplete reaction of the fuel.

According to one embodiment of the second aspect of the invention, the two single guns 1 are angled from 0 to 5 to the horizontal. It can be understood that, according to the actual situation, the two single lances 1 in the submerged lance 1000 may be arranged at an appropriate angle, for example, the angle between the two single lances 1 and the horizontal plane may be 0 °, 3 ° or 5 °, so that on one hand, the high temperature zone may be moved toward the inside of the molten bath and away from the furnace wall of the side-blown converter 2000, thereby effectively protecting the copper water jacket 32 and the lining refractory bricks 33, and on the other hand, the combustion efficiency of the fuel may be ensured, and the incomplete reaction of the fuel may be avoided.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The submerged lance is characterized in that the submerged lance is arranged on a side-blown furnace body and works below a slag surface, the submerged lance is formed by assembling two single lances which are adjacent to each other at a left-right interval, the front ends of the two single lances are close to each other, the rear ends of the two single lances are far away from each other, one single lance of the two single lances is used for spraying fuel into the side-blown furnace, the other single lance of the two single lances is used for spraying oxygen-enriched air into the side-blown furnace, the two single lances are provided with hollow through channels, and the tail parts of the two single lances are further provided with medium inlets which are communicated with the hollow through channels and form a Y shape with the hollow through channels.

2. The submerged lance defined in claim 1 wherein each of the individual lances includes a head lance, an intermediate lance holder, a tail connector and a closure, the rear end of the head lance being releasably connected to the front end of the intermediate lance holder, the rear end of the intermediate lance holder being releasably connected to the front end of the tail connector, the head lance, the intermediate lance holder and the tail connector together defining the hollow through passage, the tail connector defining the media inlet, the closure being releasably secured to the rear end of the hollow through passage.

3. The submerged lancing of claim 2, wherein the head nozzle is fabricated from a high temperature resistant alloy.

4. The submerged lance of claim 2, wherein the intermediate lance holder is adapted to be secured to the side-blown furnace shaft by bolts.

5. The submerged lance of claim 2, wherein the block piece is one or a combination of a self-blocking steel ball, a nut and a valve.

6. A submerged lancing according to any one of claims 1 to 5, characterised in that the axes of the two individual lances form an angle of between 0 ° and 30 ° and meet at a point in the side-blown vessel.

7. A submerged lancing as claimed in any one of claims 1 to 5, in which the forward end of the hollow through channel forms a throat.

8. A submerged lancing as claimed in any one of claims 1 to 5, characterised in that the medium flow rate at the outlet of the hollow through channel is in the range 100 to 500 m/s.

9. A side blown furnace, comprising:

a furnace body;

a plurality of submerged lancing, each of said submerged lancing being in accordance with any one of claims 1 to 9, mounted spaced apart on opposite sides of the shaft.

10. The side-blown converter of claim 9, wherein a plurality of lance zone lance seats are provided on the furnace body in one-to-one correspondence with the plurality of submerged lances; each spray gun zone spray gun seat is composed of two independent single spray gun seats, two single spray gun seats in each spray gun zone spray gun seat are composed of refractory bricks and copper water jackets which are sequentially arranged from the inside of the side-blown converter to the outside of the side-blown converter, and two single spray gun seats in each spray gun zone spray gun seat respectively define insertion holes into which two single spray guns of each submerged spray gun are correspondingly inserted; the two single guns of each submerged spray gun are respectively and correspondingly inserted into the two insertion holes in the spray gun seat of each spray gun area and are fixed with the furnace body.

11. The side-blown converter of claim 10, wherein the plurality of submerged lances are the submerged lances of claim 4, the head nozzles of the two single lances of each submerged lance are respectively inserted into the two insertion holes in the lance base of each lance zone, and the intermediate lance bases of the two single lances of each submerged lance are respectively fixed on the outer side surfaces of the corresponding lance base by the bolts.

12. The side-blown converter according to any one of claims 9 to 11, wherein two of said single lances of said submerged lance are arranged horizontally.

13. The side-blown converter according to any one of claims 9 to 11, wherein the front ends of two of the single lances in the submerged lance are arranged to be inclined downward, and the inclined angles of the two single lances are the same.

14. The side-blown converter of claim 13, wherein the angle between the two single lances and the horizontal plane is between 0 ° and 5 °.