CN213357625U - Steel slag and tempering agent cooperative tempering system - Google Patents
Steel slag and tempering agent cooperative tempering system Download PDFInfo
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- CN213357625U CN213357625U CN202021337609.5U CN202021337609U CN213357625U CN 213357625 U CN213357625 U CN 213357625U CN 202021337609 U CN202021337609 U CN 202021337609U CN 213357625 U CN213357625 U CN 213357625U
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Abstract
The utility model discloses a slag and quenching and tempering agent quenching and tempering processing system in coordination belongs to ferrous metallurgy technical field, and it is serious to have solved among the prior art slag pile and pile up environmental pollution to and the slag invariability that current slag handled is poor, and the activity is poor, the very big limited problem of building materials field engineering application. The utility model discloses a steel slag and conditioner agent collaborative tempering system, which comprises a tempering furnace and a driving mechanism, wherein the tempering furnace comprises a tempering furnace molten pool, the upper part of the tempering furnace is provided with a steel slag feed inlet and a conditioner agent feed inlet, and the tempering furnace is also provided with a coal-oxygen lance; the driving mechanism is arranged at the bottom of the hardening and tempering furnace and is used for driving the hardening and tempering furnace to rotate and swing. The utility model provides a steel slag and tempering agent synergy tempering treatment system which can realize high temperature phase reaction by utilizing sensible heat of molten steel slag and has low energy consumption; and energy is saved.
Description
Technical Field
The utility model belongs to the technical field of ferrous metallurgy technique and specifically relates to a slag and quenching and tempering agent quenching and tempering processing system in coordination.
Background
The steel slag is a kind of slag discharged in the steel making process, the discharge amount is large, the discharge amount accounts for 10% -15% of the steel output, and the large discharge of the steel slag not only destroys the ecological environment, but also wastes resources. In fact, the steel slag is a high-quality waste heat resource, the temperature of the liquid steel slag is 1450-1650 ℃, the specific heat capacity is 1.2 kJ/(kg-DEG C), and the enthalpy value can reach 2000MJ/t, which is equivalent to 61kg of standard coal.
The steel slag mainly comprises calcium, magnesium, iron, silicon and a small amount of oxides of aluminum, sodium, manganese and the like, and f-CaO (free calcium oxide) and f-MgO (free magnesium oxide) contained in the steel slag can generate volume expansion after hydration, which becomes an important factor influencing the stability of the steel slag. After f-CaO in the steel slag is hydrated, Ca (OH) can be generated2So that the volume of the steel slag is increased by 1.98 times, and the f-MgO in the steel slag is hydrated to generate Mg (OH)2The volume of the steel slag is increased by 2.48 times. Researches show that the stability of the steel slag can be effectively improved after the steel slag is autoclaved and maintained for a period of time, but the method increases the complexity of the process, has certain limitations and is not suitable for the condition that the content of the steel slag is too high. The steel slag mixing amount is too high, so that concrete cracking is caused, the structure of a building is damaged, and great potential safety hazards are brought.
The steel slag quenching, tempering and reconstruction takes the mineral composition of silicate cement clinker as a design target, and the steel slag is added with regulating components to regulate and control the chemical and mineral composition and structure of the steel slag, so as to reconstruct the steel slag and achieve the aims of stabilizing the quality of the steel slag and regulating and controlling the gelling property of the steel slag. The modifier, copper slag, red mud and the like not only contain a large amount of Fe, Ni, Cr, Cu, Pb, Zn elements, but also are rich in CaO and SiO2，MgO，Al2O3The components are good steel slag hardening and tempering agents, and the steel slag hardening and tempering agent is rich in resources and low in price. At present, researches on how to effectively combine the metal recovery in the tempering agent, the copper slag and the red mud with the tempering modification of the steel slag are few.
SUMMERY OF THE UTILITY MODEL
In view of the above analysis, the present invention aims to provide a steel slag and conditioner synergistic conditioning system, which can solve at least one of the following problems: (1) the existing quenching and tempering agents such as nonferrous metal smelting slag (copper slag and red mud) are stacked and piled, and the environmental pollution is serious; (2) valuable metals in the hardening and tempering agent are not effectively utilized, so that resource waste is caused; (3) the existing steel slag treatment method has poor steel slag stability and activity, and the engineering application in the building material field is greatly limited; (4) the high-temperature sensible heat of the steel slag is not fully utilized in the conventional steel slag treatment method, and the recovery of iron oxide components in the steel slag is low.
The purpose of the utility model is mainly realized through the following technical scheme:
the utility model provides a steel slag and tempering agent collaborative tempering system, which comprises a tempering furnace and a driving mechanism, wherein the tempering furnace comprises a tempering furnace molten pool, the upper part of the tempering furnace is provided with a steel slag feed inlet and a tempering agent feed inlet, and the tempering furnace is also provided with a coal-oxygen lance; the driving mechanism is arranged at the bottom of the hardening and tempering furnace and is used for driving the hardening and tempering furnace to rotate and swing.
Furthermore, the left side and the right side of the quenching and tempering furnace are respectively provided with a slag outlet and an iron outlet.
Further, the hardening and tempering agent comprises one or more of laterite-nickel ore, copper slag or red mud.
Further, the coal-oxygen lance comprises a bottom coal-oxygen blowing lance and a side coal-oxygen blowing lance, and the bottom coal-oxygen blowing lance is arranged at the bottom of the tempering furnace; the side-blowing coal oxygen lance is arranged on the side wall of the quenching and tempering furnace.
Furthermore, the number of the bottom coal-blowing oxygen guns is multiple, and the number of the side coal-blowing oxygen guns is multiple.
Further, the device also comprises a riding wheel mechanism, and the riding wheel mechanism is used for supporting the hardening and tempering furnace.
Furthermore, the two sets of riding wheel mechanisms are symmetrically distributed at the bottom of the hardening and tempering furnace.
Further, the system for quenching and tempering in coordination with the steel slag and the quenching and tempering agent further comprises a quenching and tempering furnace flue gas treatment unit, wherein the quenching and tempering furnace flue gas treatment unit comprises a flue gas outlet cover, an ascending flue, a post-combustion chamber, a gravity dust fall device, a waste heat boiler, a flue gas temperature regulation/desulfurization tower, a dust collection cloth bag, an induced draft fan, a flue gas circulation waste heat utilization pipeline and a chimney which are sequentially connected.
Furthermore, the system for the coordinated quenching and tempering treatment of the steel slag and the quenching and tempering agent further comprises a pig iron casting and collecting unit, and the tapping hole is connected with the pig iron casting and collecting unit through an iron runner.
Further, the steel slag and tempering agent cooperative tempering system further comprises a tempered slag processing unit, and the tempered slag processing unit is connected with the slag outlet.
Further, the steel slag and tempering agent cooperative tempering system further comprises a drying pretreatment unit, and the drying pretreatment unit is used for drying the tempering agent.
Compared with the prior art, the utility model discloses can realize one of following beneficial effect at least:
a) the utility model provides a steel slag and tempering agent are quenching and tempering processing system in coordination, through setting up the quenching and tempering stove, can carry out the reaction of melting steel slag and tempering agent in the quenching and tempering stove, can utilize the sensible heat of melting steel slag to realize the high temperature phase reaction, the energy consumption is low; and energy is saved. A plurality of sets of bottom coal-blowing oxygen guns and side coal-blowing oxygen guns are arranged along the axial direction (length direction) of the tempering furnace, so that the uniformity of the reaction of a molten pool of the tempering furnace can be ensured and the stirring effect of the molten pool can be improved.
b) The quenching and tempering furnace of the steel slag and quenching and tempering agent coordinated quenching and tempering treatment system is supported by 2 sets of riding wheel mechanisms, and the gear rings of 1 set of driving mechanism drive the quenching and tempering furnace to swing and rotate, so as to accelerate the reduction reaction of metal oxides in a molten pool, shorten the operation period of slag quenching and tempering, and be beneficial to more uniform distribution of materials in the furnace; the tap hole and the slag hole of the quenching and tempering furnace are arranged at two ends of the quenching and tempering furnace, and the quenching and tempering furnace swings and rotates, so that tapping and slag discharging operations are more convenient.
c) After the steel slag and the tempering agent are subjected to the cooperative tempering treatment by adopting the steel slag and tempering agent cooperative tempering treatment system, the free CaO, MgO and RO phases in the tempered slag are few, the f-CaO content in the tempered slag is reduced to below 1 percent and is far lower than the f-CaO content in the untreated steel slag, the volume stability of the steel slag is obviously improved, and the steel slag can be used in the field of cement concrete and is not limited by the application range; a large amount of iron resources in the conditioner are synchronously recovered, and valuable metals such as lead, zinc, potassium, sodium and the like can be effectively recovered and utilized, thereby conforming to the development trend of the national circular economy society.
d) The quenching and tempering treatment system with the cooperation of the steel slag and the quenching and tempering agent has the advantages that the utilization rate of waste heat of the molten steel slag is high, the molten steel slag is smelted with the quenching and tempering agent in the quenching and tempering furnace, the waste heat of the tempered high-temperature flue gas is recycled through the waste heat boiler to generate power, the dedusted flue gas at 180-200 ℃ is circulated to the dryer, the using amount of the dried coal gas is reduced, and waste heat resources are fully utilized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.
FIG. 1 is a schematic view of the overall structure of a steel slag and tempering agent cooperative tempering system of the present invention;
FIG. 2 is a schematic structural view of a quenching and tempering unit in the system for quenching and tempering steel slag and a quenching and tempering agent in cooperation according to the present invention;
FIG. 3 is a sectional view of the quenching and tempering unit of the steel slag and quenching and tempering agent cooperative system of the present invention at A-A;
FIG. 4 is a cross-sectional view of the quenching and tempering unit of the steel slag and quenching and tempering agent cooperative quenching and tempering system of the present invention at the position B-B;
FIG. 5 is a cross-sectional view of the quenching and tempering unit of the steel slag and quenching and tempering agent cooperative quenching and tempering system of the present invention at the C-C position;
FIG. 6 is a schematic structural view of a post-quenching and tempering slag treatment unit in the steel slag and quenching and tempering agent cooperative quenching and tempering system of the present invention;
FIG. 7 is a schematic structural view of a pig iron casting and collecting unit in a steel slag and tempering agent synergistic tempering system according to the present invention;
FIG. 8 is a schematic structural view of a flue gas treatment unit of a quenching and tempering furnace in a system for quenching and tempering steel slag and a quenching and tempering agent in cooperation with the present invention;
FIG. 9 is a schematic structural view of a molten steel slag handling unit in a steel slag and tempering agent cooperative tempering system of the present invention;
FIG. 10 is a schematic structural view of a drying and pre-treating unit in a steel slag and tempering agent synergistic tempering system of the present invention.
Reference numerals:
a-a thermal refining unit; b-a tempering furnace flue gas treatment unit; c, slag treatment unit after tempering; d-a molten steel slag handling unit; e-a drying pretreatment unit; f-a pig iron casting and collection unit; 1-hoisting a travelling crane by a ladle; 2-a ladle; 3-converter; 4-hoisting the converter slag ladle by using a running vehicle; 5-melting a steel slag ladle; 6-hardening and tempering agent storage yard; 7-a grab bucket machine; 8-hardening and tempering agent bin; 9-a crusher; 10-drying the feeding belt; 11-a dryer; 12-gas burner; 13 gas burner combustion fan; 14-drying the flue gas furnace; 15-mixing a circulating flue gas fan; 16-drying the discharging belt; 17-a tempering agent buffer bin; 18-a disk feeder; 19-weighing the belt; 20-drying the flue gas desulfurization tower; 21-drying the flue gas dust remover; 22-drying flue gas induced draft fan; 23-drying the flue gas chimney; 24-feeding and feeding belt; 25-entering a furnace cache bin; 26-a steel slag feed port; 27-a hardening and tempering furnace molten pool; 28-a drive mechanism; 29-riding wheel mechanism; 30-pulverized coal; 31-oxygen/oxygen enriched air; 32-bottom blowing coal oxygen lance; 33-side blowing coal oxygen lance; 34-a taphole; 35-a slag outlet; 36-smoke outlet mask and ascending flue; 37-iron runner; 38-pig machine; 39-a pig iron collection device; 40-slag flushing; 41-slag flushing water; 42-a sedimentation tank; 43-a crane; 44-a slag bath; 45-air nozzles; 46-a post-combustion chamber; 47-gravity dust settling; 48-boiler membrane walls; 49-waste heat boiler; 50-a flue gas temperature regulating air valve; a 51-SDS dry desulfurization milling chamber; 52-flue gas tempering/desulfurization tower; 53-flue; 54-dust collection cloth bag; 55-a dust collection device; 56-induced draft fan; 57-flue gas circulation waste heat utilization pipeline; and 58-chimney.
Detailed Description
The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention.
The embodiment provides a steel slag and tempering agent cooperative quenching and tempering system, which is shown in fig. 1 to 10 and comprises a quenching and tempering unit a, as shown in fig. 2 to 5, the quenching and tempering unit a comprises a quenching and tempering furnace, the quenching and tempering furnace comprises a quenching and tempering furnace molten pool 27, and the upper part of the quenching and tempering furnace is provided with a steel slag feeding hole 26 and a tempering agent feeding hole; the bottom of the tempering furnace is also provided with a driving mechanism 28 and two sets of riding wheel mechanisms 29, the two sets of riding wheel mechanisms 29 are symmetrically distributed at the bottom of the tempering furnace, and the riding wheel mechanisms 29 are used for supporting the tempering furnace; the driving mechanism 28 is used for driving the tempering furnace to swing and rotate, so that the uniform distribution of materials in the tempering furnace molten pool can be facilitated, and the reaction process in the tempering furnace molten pool can be accelerated; the bottom of the quenching and tempering furnace is also provided with a plurality of bottom coal-blowing oxygen lances 32; a plurality of side-blown coal oxygen lances 33 are also arranged on the side wall of the quenching and tempering furnace; the molten steel slag enters a hardening and tempering furnace molten pool 27 through a steel slag feed inlet 26, the hardening and tempering agent enters the hardening and tempering furnace molten pool 27 through a hardening and tempering agent feed inlet, and the molten steel slag and the hardening and tempering agent can be subjected to hardening and tempering in the hardening and tempering furnace molten pool 27. Specifically, the hardening and tempering agent comprises one or more of laterite-nickel ore, copper slag or red mud.
Specifically, a furnace inlet buffer bin 25 is arranged above the feeding hole of the tempering agent and used for storing the dried tempering agent to be fed into the furnace.
Specifically, the left and right sides of the hardening and tempering furnace are respectively provided with a slag outlet 35 and a tap hole 34.
For example, as shown in fig. 2 to 5, the quenching and tempering furnace is a cylindrical structure with two closed ends, two sets of riding wheel mechanisms 29 are symmetrically distributed at two axial ends of the quenching and tempering furnace to support the radial lower part of the quenching and tempering furnace, and the quenching and tempering furnace can swing and rotate along the circumferential direction under the support of the riding wheels of the riding wheel mechanisms 29 under the drive of the driving mechanism 28. The radial upper part of the hardening and tempering furnace is provided with a steel slag feed inlet 26 and a hardening and tempering agent feed inlet. The plurality of bottom-blowing coal oxygen lances 32 are axially arranged at the radial bottom of the tempering furnace, and the plurality of side-blowing coal oxygen lances 33 are axially arranged on the circumferential side wall above the radial bottom of the tempering furnace.
Specifically, the steel slag and tempering agent cooperative tempering system further includes a pig iron casting and collecting unit f, as shown in fig. 7, the pig iron casting and collecting unit f includes an pig iron casting machine 38 and a pig iron collecting device 39; the tap hole 34 is connected with an iron casting machine 38 through an iron runner 37, and high-temperature molten iron flows into the iron casting machine 38 from the tap hole 34 through the iron runner 37 to be cast into nickel-chromium alloy pig iron blocks which are collected by a pig iron collecting device 39 and then sent to a steel plant for steel making.
Or the pig iron casting and collecting unit f includes a hot-metal ladle into which high-temperature molten iron flows from the tap hole 34 to be transported to steel making in a steel plant.
Specifically, the steel slag and tempering agent cooperative tempering system further comprises a tempered slag processing unit c, as shown in fig. 6, the tempered slag processing unit c comprises a slag runner 40, a sedimentation tank 42, a crane 43 and a slag tank 44, a slag hole 35 is connected with the slag runner 40, tempered slag flows into the slag runner 40 through the slag hole 35, is quenched into slag particles of 1-3 mm under the rapid cooling of slag flushing water 41, and the slag particles are precipitated through the sedimentation tank 42, sent into the slag tank 44 for caching through the crane 43, and then sent to a subsequent slag grinding process for use in the cement industry.
In order to fully utilize the waste heat of the tempered high-temperature flue gas, the steel slag and tempering agent coordinated tempering treatment system further comprises a tempering furnace flue gas treatment unit b, as shown in fig. 2 and 8, the tempering furnace flue gas treatment unit b comprises a flue gas outlet cover and an ascending flue 36, a post-combustion chamber 46, a gravity dust fall 47, a waste heat boiler 49, a flue gas temperature adjusting/desulfurizing tower 52, a dust collecting cloth bag 54, an induced draft fan 56, a flue gas circulating waste heat utilization pipeline 57 and a chimney 58 which are sequentially connected. High-temperature flue gas (1400-1500 ℃) in the tempering furnace enters the post-combustion chamber 46 through the flue gas outlet cover and the uptake flue 36, and the high-temperature flue gas is rich in CO reducing gas and needs to be completely burnt in the post-combustion chamber 46 (the combustion of CO is completed by injecting air through the air nozzle 45); the flue gas from the post combustion chamber 46 passes through gravity dust fall 47, enters a boiler membrane wall 48 for heat exchange, and then is subjected to slag condensation through a slag condensation pipe in a waste heat boiler 49, heat exchange through a heat exchange pipe bundle and an economizer to generate steam for power generation and energy recovery. The flue gas with the temperature of 180-200 ℃ coming out of the waste heat boiler 49 is mixed with air through a flue gas temperature adjusting air valve 50 to adjust the temperature, so that the subsequent cloth bags are prevented from being burnt out accidentally, the flue gas with the temperature adjusted and the desulfurizer sprayed in a powder preparation room 51 through an SDS dry desulfurization are desulfurized in a flue gas temperature adjusting/desulfurizing tower 52, the desulfurized flue gas enters a dust collecting cloth bag 54 through a flue 53, and dust in the flue gas is collected through the dust collecting cloth bag 54 and is collected by a dust collecting device 55. The 180-200 ℃ flue gas after dust removal through the cloth bag is led out by the draught fan 56 and is sent to the drying intervention treatment unit for recycling by the flue gas circulating waste heat utilization pipeline 57 so as to recycle low-temperature waste heat and save drying energy consumption, and the purified residual flue gas is discharged into the atmosphere through the chimney 58 to achieve standard emission.
Specifically, the system for the coordinated quenching and tempering of the steel slag and the tempering agent further comprises a molten steel slag hoisting unit d, as shown in fig. 9, the molten steel slag hoisting unit d comprises a ladle hoisting travelling crane 1, a ladle 2, a converter 3, a converter slag ladle hoisting travelling crane 4 and a molten steel slag ladle 5; the ladle 2 is transported to the converter 3 by the ladle lifting travelling crane 1, the molten iron and the scrap steel are smelted together in the converter 3, the molten steel slag ladle 5 is used for containing high-temperature molten steel slag at 1550-1600 ℃ generated by steel making, and the molten steel slag ladle 5 is transported to the tempering furnace for later use by the converter slag ladle lifting travelling crane 4.
In order to prevent moisture in the tempering agent from being brought into the tempering furnace at a high temperature and avoid safety accidents, the tempering agent needs to be dried and preprocessed, as shown in fig. 10, the system for coordinately quenching and tempering steel slag and the tempering agent further comprises a drying and preprocessing unit e, and the drying and preprocessing unit e comprises a tempering agent storage yard 6, a grab bucket machine 7, a tempering agent bin 8, a crusher 9, a drying and feeding belt 10 and a dryer 11; in implementation, the grab bucket 7 grabs the conditioning agent into the conditioning agent bin 8 from the conditioning agent storage yard 6, the conditioning agent is input into the crusher 9 through the feeding belt, and the crushed conditioning agent is input into the dryer 11 for drying through the drying and feeding belt 10.
Specifically, the drying energy of the dryer 11 is provided by a flue gas drying furnace 14, the flue gas drying furnace 14 comprises a gas burner 12 and a gas burner combustion fan 13, combustion air provided by the gas and combustion fan 13 is supplied to the gas burner 12 to be combusted to obtain hot combustion flue gas (the temperature of the hot combustion flue gas is more than 1000 ℃), the hot combustion flue gas in the flue gas furnace 14 is input into the dryer 11, the hot combustion flue gas and a water-containing modifying agent are subjected to gas-solid two-phase heat exchange, and the modifying agent is dried to 110-120 ℃. The dried modifying agent is input into a modifying agent buffer bin 17 through a drying discharge belt 16, and the modifying agent in the modifying agent buffer bin 17 is input into a furnace feeding belt 24 through a disc feeder 18 and a weighing belt 19 and is sent into a furnace entering buffer bin 25 to be used as the modifying agent for standby.
Specifically, the drying pretreatment unit further comprises a drying flue gas desulfurization tower 20, a drying flue gas dust remover 21, a drying flue gas induced draft fan 22 and a drying flue gas chimney 23; the waste drying flue gas from the dryer 11 is desulfurized in a drying flue gas desulfurization tower 20, then is dedusted by a drying flue gas deduster 21, and is introduced into a drying flue gas chimney 23 by a drying flue gas induced draft fan 22 to achieve standard emission.
Compared with the prior art, the steel slag and tempering agent cooperative tempering treatment system provided by the utility model has the advantages that the tempering furnace is arranged, the molten steel slag and the tempering agent can react in the tempering furnace, the sensible heat of the molten steel slag can be utilized to realize high-temperature phase reaction, and the energy consumption is low; and energy is saved. A plurality of sets of bottom-blowing coal-oxygen guns and side-blowing coal-oxygen guns are arranged along the axial direction (length direction) of the tempering furnace, so that coal powder is respectively sprayed into a molten pool iron water layer of the tempering furnace at a high speed (100-150 m/s) by the coal-oxygen bottom-blowing gun and a molten pool slag layer of the tempering furnace by the coal-oxygen side-blowing gun by taking oxygen or oxygen-enriched air as a carrier during implementation, and reduction reaction of iron oxide and nickel-chromium oxide and slag tempering are carried out.
Specifically, the side-blown coal-oxygen lance 33 is a coal-oxygen sleeve lance (carbon-oxygen molar ratio n)c：no1: 1.1-1.3) and has another important function of heating the middle part of the molten pool by utilizing heat generated by carbon-oxygen reaction besides stirring the molten pool, and generating a large amount of CO floating gas to promote the generation of the phenomenon of 'spring' of the molten pool. In addition, the industrial pure oxygen or oxygen-enriched air blown by the upper layer side coal-oxygen blowing lance and CO gas escaping from the molten pool generate violent oxidation reaction, thereby releasing a large amount of heat energy to heat the foam slag area and the upper part of the molten pool. The bottom-blowing coal-oxygen lance 32 is also a coal-oxygen sleeve lance (carbon-oxygen molar ratio n)c：no1.6-1.8: 1) unlike the upper coal-oxygen blowing lance, the main function of the lance is to blow a large amount of coal powder to provide a reducing agent for smelting reduction, and to ensure the reaction temperature below the molten pool, a certain amount of oxygen is still blown, and the gas product is CO. The coal powder sprayed from the bottom reacts with oxygen/oxygen-enriched air in a high-temperature molten pool to obtain CO reducing gas, the CO gas and metal oxides undergo deep reduction reaction, and the metal oxides are completely reduced into metals (Fe, Ni and Cr); in addition, the coal powder blown from the bottom and iron are subjected to carburizing reaction to obtain a stream with reduced pig iron melting point and reduced molten iron viscosityThe mobility is improved, and the tapping is facilitated.
The quenching and tempering furnace of the steel slag and quenching and tempering agent coordinated quenching and tempering treatment system is supported by 2 sets of riding wheel mechanisms, and the gear rings of 1 set of driving mechanism drive the quenching and tempering furnace to swing and rotate, so as to accelerate the reduction reaction of metal oxides in a molten pool, shorten the operation period of slag quenching and tempering, and be beneficial to more uniform distribution of materials in the furnace; the tap hole and the slag hole of the quenching and tempering furnace are arranged at two ends of the quenching and tempering furnace, and the quenching and tempering furnace swings and rotates, so that tapping and slag discharging operations are more convenient.
The method for carrying out the cooperative quenching and tempering treatment of the steel slag and the quenching and tempering agent by adopting the cooperative quenching and tempering treatment system of the steel slag and the quenching and tempering agent comprises the following steps:
the method comprises the following steps: pouring molten steel slag with the temperature of 1550-1600 ℃ into a hardening and tempering furnace molten pool 27 from a steel slag feed inlet 26, and inputting a dried hardening and tempering agent into the hardening and tempering furnace molten pool 27 from a hardening and tempering agent feed inlet; the coal powder 30 takes oxygen/oxygen-enriched air 31 as a carrier, one part of the coal powder is sprayed into a bottom molten iron layer in a molten pool of the tempering furnace at a high speed by a bottom coal-blowing oxygen lance 32, and the other part of the coal powder is sprayed into a slag layer in the molten pool of the tempering furnace by a side coal-blowing oxygen lance 33 to carry out reduction reaction of iron oxide and tempering of steel slag, so as to generate high-temperature molten iron and tempered slag;
step two: when the quenching and tempering furnace is adjusted to the tapping position, high-temperature molten iron flows out from the tapping hole 34; when the quenching and tempering furnace is adjusted to the slag discharging position, the quenched and tempered slag flows out from the slag discharging hole 35.
Specifically, in the second step, when the quenching and tempering furnace is adjusted to the tapping position, high-temperature molten iron flows into an iron casting machine 38 from a tapping hole 34 through an iron runner 37, is cast into pig iron blocks, and is sent to a steel plant for steel making after being collected by a pig iron collecting device 39; or the high-temperature nickel-chromium molten iron flows into the hot-metal ladle from the tap hole 34 and is transported to a steel plant for steel making, so as to smelt stainless steel or corrosion-resistant steel; when the quenching and tempering furnace is adjusted to a slag discharging position, slag after high-temperature quenching and tempering flows into a slag flushing channel 40 from a slag discharging hole 35, slag particles with the size of 1-3 mm are quenched by water through rapid cooling of slag flushing water 41, the quenched slag particles are precipitated by a precipitation tank 42, sent into a slag tank 44 by a crane 43 for caching, and then sent to a subsequent slag grinding process for use in the cement industry; or in order to recover the sensible heat of the slag after high-temperature tempering, the slag after tempering is treated by adopting a dry granulation method.
Specifically, in the step one, the high-temperature molten steel slag may be converter steel slag or electric furnace steel slag.
In the first step, the coal powder 30 is injected into the molten pool at a high speed by the coal oxygen lance by taking oxygen/oxygen-enriched air 31 as a carrier, the coal powder is used as a reducing agent to react with iron oxide in molten steel slag or iron oxide and nickel chromium oxide in a modifying agent on one hand, and on the other hand, the reduction reaction of the molten pool is rapid and violent under the high-speed stirring action of the coal powder and the oxygen/oxygen-enriched air, so that the time of the reduction reaction and the steel slag modifying process is greatly shortened, the whole process is 45 min-1.5 h and is far lower than the hot stuffiness operation period (as long as 23h) of the existing steel slag, and the method is an energy-.
In the first step, the pulverized coal 30 is injected into the molten pool of the tempering furnace from the bottom-blowing coal oxygen lance 32 at a high speed, and the other part is injected into the slag layer in the molten pool of the tempering furnace from the side-blowing coal oxygen lance 33, using oxygen/oxygen-enriched air 31 as a carrier.
Specifically, in the first step, the quenching and tempering furnace swings and rotates under the driving of the gear ring of the driving mechanism 28, so that the reduction reaction of iron, nickel and chromium metal oxides in a molten pool and the slag quenching and tempering process can be accelerated, and the materials are more uniformly distributed in the furnace.
Specifically, the slag particles in the second step have no free CaO, MgO and RO phases, and the content of vitreous bodies in the slag particles is not less than 95%, so that the requirements of cement raw materials are met.
Specifically, in the first step and the second step, the temperature of the flue gas in the tempering furnace is high (1400-1500 ℃), and the high-temperature flue gas is rich in CO reducing gas and needs to be completely burnt in the post-combustion chamber 46, so that the high-temperature flue gas enters the post-combustion chamber 46 through the flue gas outlet cover and the uptake 36, and air is sprayed through the air nozzle 45 to complete CO combustion. The flue gas from the post combustion chamber 46 passes through gravity dust fall 47, enters a boiler membrane wall 48 for heat exchange, and then is subjected to slag condensation through a slag condensation pipe in a waste heat boiler 49, heat exchange through a heat exchange pipe bundle and an economizer to generate steam for power generation and energy recovery. The flue gas with the temperature of 180-200 ℃ coming out of the waste heat boiler 49 is mixed with air through a flue gas temperature adjusting air valve 50 to adjust the temperature, so that the subsequent cloth bags are prevented from being burnt out accidentally, the flue gas with the temperature adjusted and the desulfurizer sprayed in a powder preparation room 51 through an SDS dry desulfurization are desulfurized in a flue gas temperature adjusting/desulfurizing tower 52, the desulfurized flue gas enters a dust collecting cloth bag 54 through a flue 53, and dust in the flue gas is collected through the dust collecting cloth bag 54 and is collected by a dust collecting device 55. The 180-200 ℃ flue gas after dust removal through the dust collection cloth bag is led out by the draught fan 56 and is sent to the drying intervention processing unit (input into the flue gas furnace 14) for recycling through the flue gas circulating waste heat utilization pipeline 57, so that low-temperature waste heat is recycled, drying energy consumption is saved, and the purified surplus flue gas is discharged into the atmosphere through the chimney 58, so that standard discharge is realized.
Specifically, in the first step, in order to prevent moisture in the conditioning agent from being brought into the conditioning furnace with high temperature and avoid safety accidents, the conditioning agent needs to be subjected to drying intervention processing, the grab bucket 7 grabs the conditioning agent into the conditioning agent bin 8 from the conditioning agent storage yard 6, the conditioning agent is input into the crusher 9 through the feeding belt, and the crushed conditioning agent is input into the dryer 11 through the drying feeding belt 10 for drying.
It should be noted that the drying energy of the dryer 11 is provided by a flue gas drying furnace 14, the gas is supplied to a gas burner 12 through combustion air provided by a gas burner combustion fan 13 to be combusted to obtain hot combustion flue gas (the temperature of the hot combustion flue gas is greater than 1000 ℃), the hot combustion flue gas in the flue gas furnace 14 is input into the dryer 11, the hot combustion flue gas and the water-containing conditioning agent perform gas-solid two-phase heat exchange, and the conditioning agent is dried to 110-120 ℃. The dried modifying agent is sent into a furnace cache bin 25 to be used as the modifying agent for standby. The waste drying flue gas of the dryer 11 is desulfurized in the drying flue gas desulfurization tower 20, then is dedusted by the drying flue gas deduster 21, and is introduced into the drying flue gas chimney 23 by the drying flue gas induced draft fan 22 to achieve standard emission. Specifically, in order to save energy consumption, the flue gas at 180-200 ℃ after dust is collected by the dust collecting bag is input into the flue gas furnace 14 to be used as part of drying energy.
Compared with the prior art, the steel slag and tempering agent cooperative tempering treatment system provided by the utility model has the advantages that the tempering furnace is arranged, the molten steel slag and the tempering agent can react in the tempering furnace, the sensible heat of the molten steel slag can be utilized to realize high-temperature phase reaction, and the energy consumption is low; energy is saved; the quenching and tempering furnace of the steel slag and quenching and tempering agent coordinated quenching and tempering treatment system is supported by 2 sets of riding wheel mechanisms, and the gear rings of 1 set of driving mechanism drive the quenching and tempering furnace to swing and rotate, so as to accelerate the reduction reaction of metal oxides in a molten pool, shorten the operation period of slag quenching and tempering, and be beneficial to more uniform distribution of materials in the furnace; the tap hole and the slag hole of the quenching and tempering furnace are arranged at two ends of the quenching and tempering furnace, and the quenching and tempering furnace swings and rotates, so that tapping and slag discharging operations are more convenient.
After the steel slag and the tempering agent are subjected to the cooperative tempering treatment by adopting the steel slag and tempering agent cooperative tempering treatment system, the free CaO, MgO and RO phases in the tempered slag are few, the f-CaO content in the tempered slag is reduced to below 1 percent and is far lower than the f-CaO content in the untreated steel slag, the volume stability of the steel slag is obviously improved, and the steel slag can be used in the field of cement concrete and is not limited by the application range; a large amount of iron resources in the conditioner are synchronously recovered, and valuable metals such as lead, zinc, potassium, sodium and the like can be effectively recovered and utilized, thereby conforming to the development trend of the national circular economy society.
The quenching and tempering treatment system with the cooperation of the steel slag and the quenching and tempering agent has the advantages that the utilization rate of waste heat of the molten steel slag is high, the molten steel slag is smelted with the quenching and tempering agent in the quenching and tempering furnace, the waste heat of the tempered high-temperature flue gas is recycled through the waste heat boiler to generate power, the dedusted flue gas at 180-200 ℃ is circulated to the dryer, the using amount of the dried coal gas is reduced, and waste heat resources are fully utilized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (9)
1. A steel slag and tempering agent cooperative tempering system is characterized by comprising a tempering furnace and a driving mechanism (28), wherein the tempering furnace comprises a tempering furnace molten pool (27), the upper part of the tempering furnace is provided with a steel slag feeding hole (26) and a tempering agent feeding hole (2601), and the tempering furnace is also provided with a coal-oxygen lance; the driving mechanism (28) is arranged at the bottom of the hardening and tempering furnace and is used for driving the hardening and tempering furnace to rotate and swing.
2. The system for quenching and tempering steel slag and tempering agent cooperation according to claim 1, wherein both ends of said quenching and tempering furnace are respectively provided with a slag outlet (35) and a tap hole (34).
3. The system for the cooperative hardening and tempering treatment of steel slag and a hardening and tempering agent according to claim 1, wherein the coal-oxygen lance comprises a bottom-blowing coal-oxygen lance (32) and a side-blowing coal-oxygen lance (33), and the bottom-blowing coal-oxygen lance (32) is arranged at the bottom of the hardening and tempering furnace; the side-blown coal oxygen lance (33) is arranged on the side wall of the quenching and tempering furnace.
4. The system for quenching and tempering steel slag and tempering agent together according to claim 3, wherein said bottom-blowing coal-oxygen lance (32) is plural in number, and said side-blowing coal-oxygen lance (33) is plural in number.
5. The system for quenching and tempering steel slag and tempering agent in coordination according to claim 1, further comprising a riding wheel mechanism (29), wherein the riding wheel mechanism (29) is used for supporting the quenching and tempering furnace.
6. The system for the cooperative hardening and tempering of the steel slag and the hardening and tempering agent according to claim 5, wherein two sets of the riding wheel mechanisms (29) are provided, and the two sets of the riding wheel mechanisms (29) are symmetrically distributed at the bottom of the hardening and tempering furnace.
7. The system of claim 1, further comprising a flue gas treatment unit (b) of the tempering furnace, wherein the flue gas treatment unit (b) comprises a flue gas outlet cover, an ascending flue (36), a afterburning chamber (46), a gravity dust fall (47), a waste heat boiler (49), a flue gas temperature adjusting/desulfurizing tower (52), a dust collecting cloth bag (54), an induced draft fan (56), a flue gas circulating waste heat utilization pipeline (57) and a chimney (58) which are sequentially connected.
8. The system for co-quenching and tempering steel slag and tempering agent according to claim 2, further comprising a pig iron casting and collecting unit (f), wherein said tapping hole (34) is connected to said pig iron casting and collecting unit (f) through a runner (37).
9. The system for co-quenching and tempering steel slag according to any one of claims 1 to 8, wherein said system for co-quenching and tempering steel slag with a quenching and tempering agent further comprises a post-quenching slag processing unit (c).
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| CN115121586A (en) * | 2022-07-04 | 2022-09-30 | 中冶节能环保有限责任公司 | Electric furnace slag treatment method and device |
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