CN109971905B - A system and method for optimizing HIsmelt smelting reduction by utilizing steel production waste gas - Google Patents

A system and method for optimizing HIsmelt smelting reduction by utilizing steel production waste gas Download PDF

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CN109971905B
CN109971905B CN201910234833.7A CN201910234833A CN109971905B CN 109971905 B CN109971905 B CN 109971905B CN 201910234833 A CN201910234833 A CN 201910234833A CN 109971905 B CN109971905 B CN 109971905B
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gas
flue gas
flue
smelting reduction
waste
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CN109971905A (en
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薛向欣
宋翰林
张金鹏
杨合
程功金
黄壮
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Northeastern University China
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0073—Selection or treatment of the reducing gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/02—Treatment of the exhaust gas
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/04—Recirculation of the exhaust gas
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/06—Energy from waste gas used in other processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]

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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

本发明涉及冶金炼铁技术领域，尤其涉及一种利用钢产废气优化HIsmelt熔融还原的系统及方法。系统中包括有主烟道、预反应器和熔融还原炉；主烟道上设有带有烟气成分检测器的分流阀，烟气成分检测器检测通过分流阀的烟气中CO的浓度值来决定导通方向，预反应器伸入熔融还原炉内，预反应器底部设有混合进料喷嘴，预反应器将第一次预热及预还原后的烟气与矿、煤粉混合通过混合进料喷嘴送入熔融还原炉中进行第二次还原反应。该方法充分利用了钢铁企业的废气资源，极大的提高了副产价值且减少了天然气的消耗，降低成本，提高燃烧效率和热能利用率，减少二次燃烧的时间，使反应炉更快进入生产状态，减少粉尘和和煤气洗涤负担，提高余热回收率。

Figure 201910234833

The invention relates to the technical field of metallurgical ironmaking, in particular to a system and method for optimizing HIsmelt smelting reduction by utilizing waste gas from steel production. The system includes a main flue, a pre-reactor and a smelting reduction furnace; the main flue is provided with a diverter valve with a flue gas composition detector, and the flue gas composition detector detects the concentration of CO in the flue gas passing through the diverter valve. Determine the conduction direction, the pre-reactor extends into the melting reduction furnace, the bottom of the pre-reactor is equipped with a mixing feed nozzle, the pre-reactor mixes the flue gas after the first preheating and pre-reduction with ore and pulverized coal through mixing The feed nozzle is sent into the smelting reduction furnace for the second reduction reaction. The method makes full use of the waste gas resources of iron and steel enterprises, greatly improves the value of by-products, reduces the consumption of natural gas, reduces costs, improves combustion efficiency and thermal energy utilization rate, reduces the time of secondary combustion, and makes the reaction furnace enter faster. In the production state, the burden of dust and gas washing is reduced, and the waste heat recovery rate is improved.

Figure 201910234833

Description

System and method for optimizing HIsmelt reduction by utilizing steel waste gas
Technical Field
The invention relates to the technical field of metallurgical iron making, in particular to a system and a method for optimizing HIsmelt reduction by utilizing steel waste gas.
Background
In the HIsmelt technical process, mineral powder and coal powder can be directly used for smelting, and the sprayed hot air with the temperature of 1200 ℃ and self coal gas are subjected to CO and H at the top of a smelting reduction furnace2The secondary oxidation combustion exothermic reaction generates heat energy, CO generated by the reaction in the molten iron bath and H generated by the cracking of volatile components in coal2And blowing N of the material carrier2The mixed gas is formed, the high-temperature liquid slag and iron form a mixed Yongquan due to the strong escaped rising gas, meanwhile, the temperature of the mixed Yongquan of the slag and the iron is improved through conduction and radiation by heat energy generated by oxidation and exothermic reaction at the lower part of the smelting reduction furnace, the heated mixed Yongquan of the slag and the iron falls back to the lower part of the molten iron bath to provide the requirement of the reaction on the heat energy, and the ore, the coal powder and the flux which are continuously sprayed into the molten iron bath maintain the continuous reaction.
The HIsmelt technology is an innovative process technology, and has many restrictive links while showing various advantages in the production process. Particularly, in a circulating heating and pre-reducing system of mineral powder, the original design of a mineral powder preheater is to directly use the gas of the melting reducing furnace, but at present, air and natural gas are still used, the preheated mineral powder can reach 800 ℃, the pre-reducing degree of iron oxide is 10-15%, the consumption of the natural gas is large, the cost is higher, and the efficiency is lower. In addition, the oxygen-enriched gas blown to the upper part of the melting reduction furnace is also consumed in oxidation combustion reaction, the cost is high, the physical heat utilization rate of combustion is low, and the like.
A considerable part of by-product gas generated in the steel-making process is difficult to recover and diffuse due to low concentration of reducing components, and is called converter waste gas, the temperature of the converter waste gas is about 1600 ℃, the concentration of the reducing components CO is in the range of 20-40%, and the by-product gas has great resource recycling value.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a system and a method for optimizing the HIsmelt smelting reduction by using steel waste gas.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a optimized HIsmelt smelting reduction system utilizing steel to produce waste gas comprises a main flue, a pre-reactor and a smelting reduction furnace;
a shunt valve is arranged on the main flue and is provided with a smoke component detector; the main flue is connected with a first branch flue and a second branch flue, the main flue is connected with the first branch flue and the second branch flue through the diverter valve, and the first branch flue recovers waste heat from high-temperature flue gas, removes dust, removes impurities and dries the high-temperature flue gas and stores the high-temperature flue gas to a gas holder for a user to use;
the diverter valve determines the conduction direction according to the concentration value of CO in the smoke detected by the smoke component detector and passing through the diverter valve, so that the main flue is conducted with the first branch flue or the main flue is conducted with the second branch flue;
the second branch flue sends high-temperature flue gas into a pre-reactor, the pre-reactor extends into the melting reduction furnace, and a mixed feeding nozzle is arranged at the bottom of the pre-reactor; the pre-reactor mixes the pre-reacted flue gas with ore and coal powder and feeds the mixture into the smelting reduction furnace through a mixed feeding nozzle, and the high-temperature flue gas generated by the smelting reduction furnace enters a waste heat recovery system to recover the waste heat of the flue gas.
According to the invention, the system also comprises a converter smoke hood and a high-temperature cyclone dust collector, wherein the upper part of the high-temperature cyclone dust collector is connected with the main flue;
converter petticoat pipe cover is located the converter top, and converter waste gas that converter top was discharged is collected by the converter petticoat pipe and lets in the high temperature cyclone through vaporization cooling flue in, and after the high temperature cyclone reduced the dust volume in the waste gas, send into in the main flue, and by flue gas composition detector CO concentration detects in to the flue gas through the flow divider.
According to the invention, the waste heat recovery system comprises: a convection heat exchanger, a heat accumulator and a gas tank;
the high-temperature flue gas enters the convection heat exchanger, part of heat energy of the high-temperature flue gas is recovered through heat exchange, superheated water vapor in the convection heat exchanger is stored in the heat accumulator, the flue gas coming out of the convection heat exchanger is changed into low-temperature flue gas, and the low-temperature flue gas is stored in the gas chamber for use after impurity removal and drying treatment.
According to the invention, the waste heat recovery system also comprises a waste heat boiler and a steam condensation generator set, wherein the waste heat boiler is connected with the heat accumulator in series, one side of the waste heat boiler is also connected with the steam condensation generator set, and water steam in the heat accumulator and the waste heat boiler is introduced into the steam condensation generator set to carry out steam power generation.
According to the invention, the waste heat recovery system also comprises a bag-type dust remover and a compressor, wherein flue gas from the convection heat exchanger is dedusted by the bag-type dust remover and then enters an impurity removal dryer for impurity removal and drying, one end of the compressor is connected with the impurity removal dryer, the other end of the compressor is connected with a gas chamber, and low-temperature flue gas which is purified, purified and dried by the impurity removal dryer is compressed by the compressor and then is introduced into the gas chamber for storage.
According to the invention, the convection heat exchanger is connected with a cooling tower, and cold water is supplied to the convection heat exchanger through the cooling tower so as to exchange heat with high-temperature flue gas to absorb physical sensible heat of the high-temperature flue gas.
According to the invention, cooling water generated after the steam condensation generator set generates electricity is returned to the convection heat exchanger to absorb physical sensible heat of high-temperature flue gas, or is introduced into a cooling tower to carry out wet dust removal treatment on the flue gas.
The invention also provides a method for optimizing the HIsmelt reduction by using the steel waste gas, which comprises the following steps:
collecting converter waste gas discharged from a converter, and carrying out real-time detection on the concentration of CO in flue gas after dust removal treatment:
when the volume concentration of CO in the flue gas is detected to exceed 40%, directly performing waste heat recovery, dust removal, impurity removal and drying on the flue gas, and storing the flue gas into a gas holder for a user to use;
when the volume concentration of CO in the flue gas is detected to be not more than 40%, introducing the flue gas into the ore and the coal dust, carrying out primary preheating and pre-reduction on the ore and the coal dust, and introducing the flue gas and the mixture of the ore and the coal dust which are subjected to the primary preheating and pre-reduction into a melting reduction furnace for carrying out secondary reduction reaction;
and the flue gas from the melting reduction furnace is subjected to waste heat recovery, impurity removal and drying, and then is stored in a gas storage cabinet for users to use.
(III) advantageous effects
The method of the invention has the following advantages:
1) the waste gas resources of iron and steel enterprises are fully utilized, and the value of by-products is greatly improved;
2) the transformation cost is low, the national policy is met, and the investment is low;
3) the reaction efficiency is improved, and the production cost is reduced;
4) easy operation, good production index, large processing capacity and reliable operation;
5) the physical sensible heat and the chemical latent heat of the converter waste gas are fully utilized, the consumption of natural gas is greatly reduced, the cost is reduced, the combustion efficiency and the heat energy utilization rate are improved, the secondary combustion time is shortened, the reaction furnace can enter a production state more quickly, the dust and coal gas washing burden is reduced, and the waste heat recovery rate is improved.
Drawings
FIG. 1 is a flow chart of a method for optimizing the smelting reduction of the HIsmelt by utilizing the waste gas generated by the steel;
FIG. 2 is a schematic diagram of an apparatus for optimizing the melting reduction of HIsmelt using steel-producing waste gas according to the present invention.
[ description of reference ]
1: a converter; 2: a converter hood; 3: a vaporization cooling pipeline; 4: high-temperature cyclone dust removal; 5: a smoke component detector; 6: a mineral powder preheating and pre-reducing system; 7: a mixing feed nozzle; 8: a smelting reduction furnace; 9: a convective heat exchanger; 10: a heat accumulator; 11: a waste heat boiler; 12: a steam condensation generator set; 13: bag dust removal; 14: an impurity removal dryer; 15: a compressor; 16: a gas cabinet; a: a main flue; b: a flow divider valve; a1: a first branch flue; a2: a second branch flue; 01: a waste heat recovery system.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
The invention aims to provide a method for optimizing the HIsmelt reduction by utilizing steel waste gas, which has the overall thought that:
after high-temperature (1400-1600 ℃) flue gas generated by a converter is subjected to vaporization cooling and high-temperature cyclone dust removal, the flue gas with the CO concentration of less than 40% is introduced into a mineral powder pre-reactor to carry out primary preheating and pre-reduction on ore and coal powder, then the flue gas enters a melting reduction furnace through a mixed feeding nozzle to carry out secondary preheating and pre-reduction on the ore powder, and the flue gas discharged from the melting reduction furnace is subjected to waste heat recovery, impurity removal and drying treatment and then is stored in a gas cabinet for users to use. The converter steelmaking waste gas replaces the original oxygen-enriched natural gas injection mineral powder to preheat and pre-reduce, so that the natural gas consumption is reduced, the cost is reduced, the combustion efficiency and the heat energy utilization rate are improved, the secondary combustion is reduced, the reduction furnace is enabled to enter a production state more quickly, the dust and coal gas washing burden is reduced, and the waste heat recovery rate is improved.
FIGS. 1 and 2 are respectively a process flow diagram for optimizing the HIsmelt smelting reduction system by utilizing the steel waste gas, and a schematic diagram of the composition and connection relationship of the system.
The present embodiment includes a system for optimizing HIsmelt reduction using steel off-gas, comprising:
the system comprises a converter 1, a converter hood 2, a vaporization cooling flue 3, a high-temperature cyclone dust collector 4, a diverter valve B, a flue gas component detector 5, a pre-reactor 6, a melting reduction furnace 8, a convection heat exchanger 9, a heat accumulator 10, a waste heat boiler 11, a steam condensation generator set 12 and a waste heat recovery system 01 which are arranged on the diverter valve B, wherein the flue gas purification system 01 comprises a cloth bag dust removal 13, an impurity removal dryer 14, a compressor 15 and a gas storage cabinet 16.
The top of the converter 1 is provided with a converter smoke hood 2, the converter smoke hood 2 can collect high-temperature (1400 ℃ -1600 ℃) converter waste gas generated by the converter 1, the content of CO in the converter waste gas is 20% -40%, and CO is in percentage by weight220% -30% of N2The content is 30-60%, the collected high-temperature waste gas is firstly cooled through the vaporization cooling flue 3, the temperature of the cooled converter waste gas is reduced to 900-3Reduced to 5-10 g/Nm3Then the flue gas is introduced into a main flue A from the top of the high-temperature cyclone dust collector 4, a diverter valve B is arranged on the main flue A, a flue gas component detector 5 is arranged on the diverter valve B, and the flue gas component detector 5 carries out real-time detection on the CO concentration of the flue gas passing through the diverter valve B.
When CO in the flue gas is higher than 40%, the main flue A and the first branch flue A1 are conducted by the diverter valve B, and the high-temperature flue gas is simply dedusted, impurity-removed and dried by the first branch flue A1 and then stored in a gas cabinet for a user to use;
when CO in the flue gas is lower than 40%, the main flue A and the second branch flue A2 are communicated by the flow dividing valve B, the second branch flue A2 is connected with the pre-reactor 6, the ore and the coal powder to be reduced are placed in the pre-reactor 6, the flue gas is guided into the pre-reactor 6, the ore and the coal powder are preheated and pre-reduced for the first time by the flue gas, the preheating temperature of the ore powder reaches 800-900 ℃, the pre-reduction degree is 15-20%, and the temperature of the flue gas is reduced to 750-900 ℃.
The pre-reactor 6 extends into a melting reduction furnace 8, a mixing feeding nozzle 7 is arranged at the bottom of the pre-reactor 6, after primary preheating and pre-reduction are finished, the pre-reactor 6 mixes the reacted flue gas with ore and coal powder and feeds the mixed flue gas into the melting reduction furnace 8 through the mixing feeding nozzle 7 for secondary pretreatment, the pre-reduction degree reaches 30-40%, the reacted flue gas is discharged from an air outlet of the melting reduction furnace 8 after reduction reaction is finished and is introduced into a convection heat exchanger 9 through a flue, cold water in the convection heat exchanger 9 is circularly released to recover a part of heat energy of the high-temperature flue gas, superheated steam obtained in the convection heat exchanger 9 is stored in a heat accumulator 10, the heat accumulator 10 is connected with a waste heat boiler 11 in series, the preheated water enters the waste heat boiler 11, and the high-temperature flue gas from the convection heat exchanger 9 is introduced into the waste heat boiler 11 to recover a part of, the waste heat boiler 11 is sequentially connected with the steam condensation generator set 12, the heat accumulator 10 stabilizes the normal air supply pressure of the steam condensation generator set 12, hot steam is introduced into the steam condensation generator set 12 for power generation, the system generates 140-fold steam at the average temperature of 140-fold at 160 ℃, the outlet temperature of the waste heat boiler is in the range of 130-fold at 160 ℃, and the working pressure is 4-6 MPa.
After the heat is released in the circulation of the convection heat exchanger 9, the smoke is cooled and then is subjected to dust removal treatment by a dust remover 13 (such as a device or equipment for wet dust removal, dry dust removal or bag dust removal), a bag is selected for dust removal in the invention, and after the smoke is subjected to dust removal treatment by the bag dust remover 13, the smoke dust amount is reduced to 30mg/Nm3The flue gas after dust removal is introduced into the impurity removal dryer 14 to remove harmful impurities and redundant moisture, and the flue gas after deep purification, impurity removal and drying is compressed into the gas storage cabinet 16 by the compressor 15 to be stored for other resource utilization.
Specifically, the convection heat exchanger 9 is connected with a cooling tower, and the cooling tower provides cold water for the convection heat exchanger 7 to exchange heat with the high-temperature flue gas to absorb physical sensible heat thereof.
Specifically, cooling water generated after power generation by the steam condensation generator set 11 is returned to the convection heat exchanger 9 to absorb physical sensible heat of the high-temperature flue gas, or is introduced into a cooling tower to perform wet dust removal treatment on the flue gas.
The present invention will be further described and supplemented with reference to specific embodiments, which are as follows:
example 1
In the production process, the temperature of the converter waste gas is 1400 ℃, and the flue gas flow is 20 ten thousand Nm3The pressure is 85Kpa, and the smoke gas contains 20 percent of CO and 20 percent of CO2，60％N2Dust content 30g/Nm3The flue gas is firstly subjected to vaporization cooling and high-temperature cyclone dust removal, the circulating water amount is 1300t/h, and the dust content of the cleaned flue gas is 5g/Nm3And the temperature is 1200 ℃, the flue gas is divided into valves, one part of the flue gas is introduced into a pre-reactor, the ore powder is preheated to 800 ℃, the pre-reduction degree is 15%, the other part of the flue gas is mixed with ore and coal powder and is sprayed into a melting reduction furnace, the temperature of the flue gas generated after the reaction is 1450 ℃, the flue gas is introduced into a waste heat boiler through a flue to carry out heat convection, the steam temperature is 250 ℃, the temperature of the flue gas is reduced to 200 ℃, and the flue gas enters a flue gas.
Example 2
In the production process, the temperature of the converter waste gas is 1450 ℃, and the flue gas flow is 20 ten thousand Nm3The pressure is 85Kpa, and the smoke gas contains 25 percent of CO and 20 percent of CO2，55％N2Dust content 30g/Nm3The flue gas is firstly subjected to vaporization cooling and high-temperature cyclone dust removal, the circulating water amount is 1300t/h, and the dust content of the cleaned flue gas is 5g/Nm3And when the temperature is 1250 ℃, a part of the flue gas is divided into valves, one part of the flue gas is introduced into a pre-reactor, the ore powder is preheated to 850 ℃, the pre-reduction degree is 18 percent, the other part of the flue gas is mixed with the ore and the coal powder and is sprayed into a melting reduction furnace, the temperature of the flue gas generated after the reaction is 1460 ℃, the flue gas is introduced into a waste heat boiler through a flue to carry out heat convection, the steam temperature is 250 ℃, the temperature of the flue gas is reduced to 210 ℃, and.
Example 3
In the production process, the temperature of the byproduct flue gas of the converter is 1500 ℃, and the flue gas flow is 20 ten thousand Nm3The pressure is 85Kpa, and the smoke gas contains 30 percent of CO and 20 percent of CO2，50％N2Dust content 30g/Nm3The flue gas is firstly subjected to vaporization cooling and high-temperature cyclone dust removal, the circulating water amount is 1300t/h, and the dust content of the cleaned flue gas is 5g/Nm3And the temperature is 1300 ℃, the flue gas is divided into valves, one part of the flue gas is introduced into a pre-reactor, the ore powder is preheated to 880 ℃, the pre-reduction degree is 23%, the other part of the flue gas is mixed with the ore and the coal powder and is sprayed into a melting reduction furnace, the temperature of the flue gas generated after the reaction is 1480 ℃, the flue gas is introduced into a waste heat boiler through a flue for convective heat exchange, the temperature of the steam is 255 ℃, the temperature of the flue gas is reduced to 230 ℃, and the flue gas enters.
Example 4
In the production process, the temperature of the byproduct flue gas of the converter is 1600 ℃, and the flue gas flow is 20 ten thousand Nm3The pressure is 85Kpa, and the smoke gas contains 35 percent of CO and 20 percent of CO2，45％N2Dust content 30g/Nm3The flue gas is firstly subjected to vaporization cooling and high-temperature cyclone dust removal, the circulating water amount is 1300t/h, and the dust content of the cleaned flue gas is 5g/Nm3And when the temperature is 1400 ℃, a part of the flue gas is divided into valves, one part of the flue gas is introduced into a pre-reactor, the ore powder is preheated to 900 ℃, the pre-reduction degree is 27%, the other part of the flue gas is mixed with ore and coal powder and is sprayed into a melting reduction furnace, the temperature of the flue gas generated after the reaction is 1520 ℃, the flue gas is introduced into a waste heat boiler through a flue for convective heat exchange, the temperature of steam is 260 ℃, and the flue gas is cooled to 250 ℃ and enters a flue gas purification.
It should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.

Claims (8)

1.一种利用钢产废气优化HIsmelt熔融还原的系统，其特征在于：1. a system of optimizing HIsmelt smelting reduction utilizing steel production waste gas, is characterized in that: 该系统包括有主烟道（A）、预反应器（6）和熔融还原炉（8）；The system includes a main flue (A), a pre-reactor (6) and a smelting reduction furnace (8); 所述主烟道（A）上设有分流阀（B），所述分流阀（B）带有烟气成分检测器（5）；所述主烟道（A）连接有第一分支烟道（A1）和第二分支烟道（A2），所述主烟道（A）通过所述分流阀（B）连接所述第一分支烟道（A1）和第二分支烟道（A2），第一分支烟道（A1）将高温烟气回收余热、除尘除杂干燥后储存至煤气柜，供用户使用；The main flue (A) is provided with a diverter valve (B), and the diverter valve (B) is provided with a smoke composition detector (5); the main flue (A) is connected with a first branch flue (A1) and a second branch flue (A2), the main flue (A) is connected to the first branch flue (A1) and the second branch flue (A2) through the diverter valve (B), The first branch flue (A1) recovers the waste heat from the high-temperature flue gas, removes dust, removes impurities and dries it and stores it in the gas cabinet for use by users; 所述分流阀（B）根据烟气成分检测器（5）检测通过所述分流阀（B）的烟气中CO的浓度值来决定导通方向，实现主烟道（A）与第一分支烟道（A1）的导通或所述主烟道（A）与第二分支烟道（A2）的导通；The diverter valve (B) determines the conduction direction according to the detection of the concentration of CO in the flue gas passing through the diverter valve (B) by the flue gas composition detector (5), so as to realize the main flue (A) and the first branch. The conduction of the flue (A1) or the conduction of the main flue (A) and the second branch flue (A2); 所述第二分支烟道（A2）将高温烟气送入预反应器（6）中，所述预反应器（6）伸入所述熔融还原炉（8）内，所述预反应器（6）底部设有混合进料喷嘴（7）；所述预反应器（6）将预反应后的烟气与矿、煤粉混合通过混合进料喷嘴（7）送入所述熔融还原炉（8）中，所述熔融还原炉（8）产生的高温烟气进入到余热回收系统（01）对烟气余热进行回收。The second branch flue (A2) sends the high-temperature flue gas into the pre-reactor (6), the pre-reactor (6) extends into the smelting reduction furnace (8), and the pre-reactor ( 6) There is a mixing feed nozzle (7) at the bottom; the pre-reactor (6) mixes the pre-reacted flue gas with ore and pulverized coal and sends it into the smelting reduction furnace (7) through the mixing feed nozzle (7). 8), the high temperature flue gas generated by the smelting reduction furnace (8) enters the waste heat recovery system (01) to recover the waste heat of the flue gas. 2.根据权利要求1所述的利用钢产废气优化HIsmelt熔融还原的系统，其特征在于：2. the system that utilizes steel production waste gas to optimize HIsmelt smelting reduction according to claim 1, is characterized in that: 该系统还包括转炉烟罩（2）和高温旋风除尘器（4），高温旋风除尘器（4）的上部连接所述主烟道（A）；The system further comprises a converter hood (2) and a high-temperature cyclone (4), and the upper part of the high-temperature cyclone (4) is connected to the main flue (A); 所述转炉烟罩（2）罩设于转炉（1）顶部，转炉（1）顶部排出的转炉废气由转炉烟罩（2）收集并通过汽化降温烟道（3）通入高温旋风除尘器（4）中，高温旋风除尘器（4）降低废气中的烟尘量后，送入所述主烟道（A）中，并由所述的烟气成分检测器（5）对通过分流阀（B）的烟气中CO浓度进行检测。The converter hood (2) is covered on the top of the converter (1), and the converter exhaust gas discharged from the top of the converter (1) is collected by the converter hood (2) and passed through the vaporization cooling flue (3) to the high-temperature cyclone ( In 4), after the high temperature cyclone (4) reduces the amount of soot in the exhaust gas, it is sent into the main flue (A), and is detected by the flue gas composition detector (5) through the diverter valve (B). ) to detect the CO concentration in the flue gas. 3.根据权利要求1所述的利用钢产废气优化HIsmelt熔融还原的系统，其特征在于：3. the system that utilizes steel production waste gas to optimize HIsmelt smelting reduction according to claim 1, is characterized in that: 所述余热回收系统（01）包括：对流换热器（9）、蓄热器（10）和煤气柜（16）；The waste heat recovery system (01) includes: a convection heat exchanger (9), a heat accumulator (10) and a gas tank (16); 高温烟气进入对流换热器（9），通过换热回收高温烟气的一部分热能，将对流换热器（9）中的过热水蒸汽储存至蓄热器（10）中，从对流换热器（9）出来的烟气变为低温烟气，经除杂干燥处理后，存储至煤气柜（16）中供使用。The high-temperature flue gas enters the convection heat exchanger (9), and a part of the heat energy of the high-temperature flue gas is recovered through heat exchange, and the superheated water vapor in the convection heat exchanger (9) is stored in the heat accumulator (10), from the convective heat exchanger (10). The flue gas coming out of the heater (9) becomes low-temperature flue gas, which is stored in the gas cabinet (16) for use after the treatment of impurity removal and drying. 4.根据权利要求3所述的利用钢产废气优化HIsmelt熔融还原的系统，其特征在于：4. the system that utilizes steel production waste gas to optimize HIsmelt smelting reduction according to claim 3, is characterized in that: 所述余热回收系统（01）还包括余热锅炉（11）和蒸汽冷凝发电机组（12），余热锅炉（11）与蓄热器（10）串联连接，余热锅炉（11）的一侧还与蒸汽冷凝发电机组（12）连接，蓄热器（10）和余热锅炉（11）内的水蒸汽通入蒸汽冷凝发电机组（12）进行蒸汽发电。The waste heat recovery system (01) further comprises a waste heat boiler (11) and a steam condensing generator set (12), the waste heat boiler (11) is connected in series with the heat accumulator (10), and one side of the waste heat boiler (11) is also connected to the steam The condensing generator set (12) is connected, and the water vapor in the heat accumulator (10) and the waste heat boiler (11) is passed into the steam condensing generator set (12) for steam power generation. 5.根据权利要求3或4所述的利用钢产废气优化HIsmelt熔融还原的系统，其特征在于：5. the system that utilizes steel production waste gas to optimize HIsmelt smelting reduction according to claim 3 or 4, is characterized in that: 所述余热回收系统（01）还包括布袋除尘器（13）、压缩机（15），从对流换热器（9）出来的烟气经过布袋除尘器（13）进行除尘后，进入除杂干燥器（14）进行除杂干燥，压缩机（15）的一端连接有除杂干燥器（14），另一端与煤气柜（16）连接，经除杂干燥器（14）除杂净化干燥后的低温烟气先由压缩机（15）压缩，后通入煤气柜（16）储存。The waste heat recovery system (01) also includes a bag filter (13) and a compressor (15). The flue gas from the convection heat exchanger (9) is dedusted by the bag filter (13), and then enters the impurity removal and drying process. One end of the compressor (15) is connected with the impurity removing dryer (14), and the other end is connected with the gas cabinet (16). The low-temperature flue gas is first compressed by the compressor (15), and then passed into the gas cabinet (16) for storage. 6.根据权利要求3所述的利用钢产废气优化HIsmelt熔融还原的系统，其特征在于：6. the system that utilizes steel production waste gas to optimize HIsmelt smelting reduction according to claim 3, is characterized in that: 所述对流换热器（9）连接有冷水塔，通过冷水塔向对流换热器（9）提供冷水，以与高温烟气热交换吸收其的物理显热。The convection heat exchanger (9) is connected with a cold water tower, and cold water is provided to the convection heat exchanger (9) through the cold water tower, so as to exchange heat with the high temperature flue gas to absorb its physical sensible heat. 7.根据权利要求4所述的利用钢产废气优化HIsmelt熔融还原的系统，其特征在于：7. the system that utilizes steel production waste gas to optimize HIsmelt smelting reduction according to claim 4, is characterized in that: 所述蒸汽冷凝发电机组（12）发电后产生的冷却水返回至对流换热器（9）中，以吸收高温烟气的物理显热，或者通入冷水塔对烟气进行湿法除尘处理。The cooling water generated by the steam condensing generator set (12) after generating electricity is returned to the convection heat exchanger (9) to absorb the physical sensible heat of the high temperature flue gas, or is passed into a cold water tower for wet dust removal treatment of the flue gas. 8.一种包括权利要求1-7任一所述的利用钢产废气优化HIsmelt熔融还原的系统的方法，其特征在于，包括：8. A method comprising the system for optimizing HIsmelt smelting reduction by utilizing the waste gas produced by steel according to any one of claims 1-7, characterized in that, comprising: 收集来自转炉排出的转炉废气，经除尘处理后，对烟气中CO浓度进行实时检测：Collect the converter waste gas discharged from the converter, and conduct real-time detection of the CO concentration in the flue gas after dedusting treatment: 当检测到烟气中CO体积浓度超过40%时，将烟气直接进行余热回收、除尘除杂干燥后储存至煤气柜供用户使用；When it is detected that the volume concentration of CO in the flue gas exceeds 40%, the flue gas is directly subjected to waste heat recovery, dust removal, impurity removal and drying, and then stored in the gas cabinet for users to use; 当检测到烟气中CO体积浓度不超过40%时，将烟气通入矿、煤粉中，对矿、煤粉进行第一次预热及预还原，将完成第一次预热及预还原的烟气及矿、煤粉混合物通入到熔融还原炉中进行第二次还原反应；When it is detected that the volume concentration of CO in the flue gas does not exceed 40%, the flue gas is passed into the ore and pulverized coal, and the ore and pulverized coal are preheated and pre-reduced for the first time, and the first preheating and pre-reduction will be completed. The reduced flue gas and the mixture of ore and pulverized coal are passed into the smelting reduction furnace for the second reduction reaction; 从所述熔融还原炉中出来的烟气经过余热回收、除杂干燥后储存到储气柜中供用户使用。The flue gas coming out of the smelting reduction furnace is stored in a gas storage cabinet for use by users after the waste heat recovery, impurity removal and drying.
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