CN109971905B - System and method for optimizing HIsmelt reduction by utilizing steel waste gas - Google Patents

System and method for optimizing HIsmelt reduction by utilizing steel 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
temperature
reduction
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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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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
    • C21B2100/02—
    • C21B2100/06—
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

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. The system comprises a main flue, a pre-reactor and a smelting reduction furnace; the main flue is provided with a diverter valve with a smoke component detector, the smoke component detector detects the concentration value of CO in smoke passing through the diverter valve to determine the conduction direction, the pre-reactor extends into the smelting reduction furnace, the bottom of the pre-reactor is provided with a mixed feeding nozzle, and the pre-reactor mixes the smoke which is preheated for the first time and is pre-reduced with ore and coal powder and feeds the mixture into the smelting reduction furnace through the mixed feeding nozzle to carry out a second reduction reaction. The method fully utilizes waste gas resources of iron and steel enterprises, greatly improves the value of by-products, reduces the consumption of natural gas, reduces the cost, improves the combustion efficiency and the heat energy utilization rate, reduces the time of secondary combustion, enables the reaction furnace to enter a production state more quickly, reduces the burden of dust and coal gas washing, and improves the recovery rate of waste heat.

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. A system for optimizing the HIsmelt smelting reduction by utilizing steel waste gas is characterized in that:
the system comprises a main flue (A), a pre-reactor (6) and a smelting reduction furnace (8);
a shunt valve (B) is arranged on the main flue (A), and the shunt valve (B) is provided with a smoke component 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 with the first branch flue (A1) and the second branch flue (A2) through the diverter valve (B), and the first branch flue (A1) recovers waste heat of high-temperature flue gas, removes dust and impurities, dries and stores the high-temperature flue gas into a gas cabinet for a user to use;
the diverter valve (B) determines the conduction direction according to the concentration value of CO in the smoke passing through the diverter valve (B) detected by the smoke component detector (5), so that the main flue (A) is conducted with the first branch flue (A1) or the main flue (A) is conducted with the second branch flue (A2);
the second branch flue (A2) feeds high-temperature flue gas into a pre-reactor (6), the pre-reactor (6) extends into the smelting reduction furnace (8), and a mixed feeding nozzle (7) is arranged at the bottom of the pre-reactor (6); the pre-reactor (6) mixes the pre-reacted flue gas with ore and coal powder and feeds the mixture into the smelting reduction furnace (8) through a mixing and feeding nozzle (7), and the high-temperature flue gas generated by the smelting reduction furnace (8) enters a waste heat recovery system (01) to recover the flue gas waste heat.
2. The system for optimizing HIsmelt reduction using steel off-gas according to claim 1, wherein:
the system also comprises a converter smoke hood (2) and a high-temperature cyclone dust collector (4), wherein the upper part of the high-temperature cyclone dust collector (4) is connected with the main flue (A);
converter petticoat pipe (2) cover is located converter (1) top, and converter (1) top exhaust converter waste gas is collected by converter petticoat pipe (2) and lets in high temperature cyclone (4) through vaporization cooling flue (3), and after high temperature cyclone (4) reduced the smoke and dust volume in the waste gas, send into in main flue (A), and by flue gas composition detector (5) detect CO concentration in to the flue gas through flow divider (B).
3. The system for optimizing HIsmelt reduction using steel off-gas according to claim 1, wherein:
the waste heat recovery system (01) comprises: a convection heat exchanger (9), a heat accumulator (10) and a gas tank (16);
the high-temperature flue gas enters the convection heat exchanger (9), a part of heat energy of the high-temperature flue gas is recovered through heat exchange, superheated steam in the convection heat exchanger (9) is stored in the heat accumulator (10), the flue gas coming out of the convection heat exchanger (9) is changed into low-temperature flue gas, and the low-temperature flue gas is stored in the gas cabinet (16) for use after impurity removal and drying treatment.
4. The system for optimizing HIsmelt reduction using steel off-gas according to claim 3, wherein:
the waste heat recovery system (01) further comprises a waste heat boiler (11) and a steam condensation generator set (12), the waste heat boiler (11) is connected with the heat accumulator (10) in series, one side of the waste heat boiler (11) is further connected with the steam condensation generator set (12), and water steam in the heat accumulator (10) and the waste heat boiler (11) is introduced into the steam condensation generator set (12) to perform steam power generation.
5. The system for optimizing HIsmelt reduction using steel off-gas according to claim 3 or 4, wherein:
waste heat recovery system (01) still includes sack cleaner (13), compressor (15), and the flue gas that comes out from convection heat exchanger (9) removes dust through sack cleaner (13) after, gets into edulcoration desicator (14) and carries out the edulcoration drying, and the one end of compressor (15) is connected with edulcoration desicator (14), and the other end is connected with gas chamber (16), and the low temperature flue gas after edulcoration drying ware (14) edulcoration purification drying is earlier compressed by compressor (15), lets in gas chamber (16) afterwards and stores.
6. The system for optimizing HIsmelt reduction using steel off-gas according to claim 3, wherein:
and the convection heat exchanger (9) is connected with a cooling tower, and cold water is supplied to the convection heat exchanger (9) 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.
7. The system for optimizing HIsmelt reduction using steel off-gas according to claim 4, wherein:
and cooling water generated after the steam condensation generator set (12) generates electricity is returned to the convection heat exchanger (9) to absorb physical sensible heat of the high-temperature flue gas, or the cooling water is introduced into a cooling tower to carry out wet dust removal treatment on the flue gas.
8. A method comprising the system for optimizing HIsmelt reduction using steel off-gas of any one of claims 1 to 7, comprising:
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.
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