CN114480766A - Method for restraining reverse gas channeling of coal gas and restraining gas of European smelting furnace shaft furnace - Google Patents
Method for restraining reverse gas channeling of coal gas and restraining gas of European smelting furnace shaft furnace Download PDFInfo
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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
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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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
- C21B13/0073—Selection or treatment of the reducing gases
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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
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
- C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/80—Interaction of exhaust gases produced during the manufacture of iron or steel with other processes
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Abstract
The invention discloses a method for restraining gas reverse channeling of gas and restraining gas by a shaft furnace of an Ou smelting furnace, which comprises the following steps: the bottom of the shaft furnace is provided with a hole, a decarbonization gas leading-in device is arranged, the top gas is pressurized by a pressurizing machine, and CO in the gas is removed by the decarbonization device2After that, CO + H in the decarbonated gas2High-reduction coal gas with the content of more than 80 percent is sent to a decarburization coal gas leading-in device at the lower part of the shaft furnace through a decarburization coal gas pipeline, and the flow, the pressure and the temperature of the decarburization coal gas are measured in real time; the decarbonized coal gas is led out by 2 circles of rectangular holes distributed on the cylindrical circumference of the lower part of the circular table at the top of the combination body of the decarbonized coal gas lead-in device after passing through the decarbonized coal gas control device and the decarbonized coal gas lead-in device, and the led decarbonized cold coal gas is mixed with hot coal gas in the shaft furnace, so that the distribution of the coal gas flow in the shaft furnace is changed, the temperature field and the pressure field are reasonably distributed, and the purpose of inhibiting the reverse channeling of the decarbonized cold coal gas is achieved.
Description
Technical Field
The invention belongs to the field of metallurgical non-blast furnace ironmaking, and particularly relates to a method for inhibiting gas from reversely flowing and inhibiting gas by a shaft furnace of an Ou-smelting furnace.
Background
On the basis of moving an original Baojing COREX-3000 furnace to eight steels, the Europe and metallurgy furnace of Chinese BaoWu iron and steel forms a unique and brand-new non-blast furnace smelting reduction iron-making process by adopting near hundred technological equipment technical innovation and system optimization, adopting local cheap coal and coke resources in Xinjiang and adding furnace burden structures of high-alkalinity sinter, pellet and raw ore. The Europe smelting furnace process is a new process for producing hot molten iron by using coal and ore, and the process has the characteristics of no or little coke, good environmental protection, low energy consumption, investment saving, strong strain capacity and the like.
According to the production practice of the eight-iron and steel Euro-smelting furnace, the Euro-smelting furnace has stable industrial production capacity, after being moved to eight steels, the operation rate is improved from 90% to more than 94% through technical upgrading, the vault temperature of the gasification furnace is controlled to 1050-1080 ℃ in the normal production process of the Euro-smelting furnace, reducing coal gas enters the shaft furnace through the surrounding pipe after being mixed with cold coal gas through the raw coal gas generating pipe, and the reducing coal gas temperature is about 835 ℃. Adding cold gas through a raw gas generating pipe, cooling, entering hot cyclone for dust removal, and entering a shaft furnace through a surrounding pipe; in addition, after part of the coal gas is washed by the washer, part of the coal gas is pressurized by the compressor to become cold coal gas for internal circulation, the rest coal gas is discharged to the coal gas main pipe network, and the last coal gas enters the shaft furnace along the DRI downcomer.
Although the production of the Europe and metallurgy furnace tends to be stable, the Europe and metallurgy furnace is influenced by the structural design of the Europe and metallurgy furnace, the situation that high-temperature coal gas at 1050-1080 ℃ of the temperature of the vault of the gasification furnace enters the shaft furnace along a DRI (sponge iron) downcomer is inevitable, and the situation that the coal gas is not strong or weak or uniform is avoided. Because high-temperature coal gas of the gasification furnace directly enters the shaft furnace, the too high temperature of the furnace charge easily causes the bonding of the furnace charge of the shaft furnace, according to the sampling analysis of the bonding material, the too high temperature of the coal gas reverse channeling is the main factor causing the bonding of the shaft furnace, in order to prevent the harm caused by the coal gas reverse channeling in the normal production, the temperature of the furnace charge is controlled to be less than 900 ℃; because DRI (sponge iron) of the shaft furnace is discharged into the gasification furnace through 8 DRI (sponge iron) spirals and blanking pipes which are uniformly distributed on the circumference, if the reverse channeling is increased or nonuniform, the discharge rate of the 8 spirals is reduced or the circumferential blanking of the shaft furnace is unstable, which causes adverse effects on the distribution of the shaft furnace and the utilization of coal gas, and simultaneously, the hourly smelting rate also causes fluctuation due to the change of the discharge rate, thereby affecting the instability of fuel ratio, affecting the stability of furnace temperature, reducing the quality of molten iron and further affecting the stable operation of the Europe and metallurgy furnace.
Disclosure of Invention
The invention aims to solve the technical problem of gas back-flowing and provides a method for restraining gas back-flowing of gas and restraining gas for a shaft furnace of an Ou-smelting furnace.
The technical scheme adopted by the invention is as follows: a method for restraining gas from back-flowing of gas by gas in a smelting furnace of Europe, 1), open a hole at the bottom of the shaft furnace, the central area of the furnace bottom is mounted a decarbonization gas leading-in device vertically, it is by round platform + upper cylinder + round platform + middle cylinder + lower cylinder assembly, use the refractory material of high alumina chrome to build and construct to form sequentially from top to bottom, distribute upper and lower two-layer rectangular ventholes according to the uniform interval of circumferential direction in the upper cylinder, the assembly is run through and set up the central passage from top to bottom, the cylinder of the lower part of the assembly is on the furnace bottom of the reduction furnace, it is mounted on the shaft furnace and opened the bottom hole which pierces through furnace bottom and body, the lower part opens the side hole, connect the control valve of decarbonization gas;
2) pressurizing the top gas by a pressurizing machine, and removing CO in the gas by a decarbonization device2Then, the decarbonized gas is sent to the decarbonized gas leading-in device through a decarbonized gas pipeline, and the flow and the temperature of the decarbonized gas are measured in real time; the decarbonized gas is discharged from the rectangular gas outlet after passing through a decarbonized gas control valve and a decarbonized gas leading-in device, the decarbonized cold gas is mixed with hot gas in the shaft furnace, the temperature of a temperature field T5 around the bottom of the decarbonized gas leading-in device is set to be 900 ℃, the temperature of the temperature field T5 at the position after cold gas and hot gas in the shaft furnace are mixed is detected in real time, according to the heat balance principle before and after the gas is mixed, the actual judgment is carried out from the measured temperature of the temperature field T5, if the actual value of the temperature field T5 is deviated from the set value, a detection and control system sends a control signal to the decarbonized gas control valve, so that the decarbonized gas control valve automatically and continuously adjusts the opening degree, and the flow of the decarbonized gas is adjusted until the temperature of the temperature field T5 of the shaft furnace reaches the set value required by production; pressurizing the decarbonized coal gas by a pressurizing machine, and controlling the temperature of the decarbonized coal gas to be 60 ℃ after the decarbonization of a decarbonization device; the flow rate of the decarbonized gas is set to 20000～250000Nm3/h；
3) The pressure field distribution in the shaft furnace has two modes: in a first mode: p0 > P4 > P1 > P5, mode II, the pressure at the bottom of the shaft furnace is maintained to be equal to the pressure at the arch crown of the gasification furnace, P0 > P1= P4 > P5, and the concrete top gas is pressurized by a pressurizing machine and is subjected to CO removal from the gas through a decarbonization device2Then, the gas is sent to a decarburization gas leading-in device at the lower part of the shaft furnace through a decarburization gas pipeline, and the pressure of the decarburization gas, the pressure at the P4 point at the bottom of the shaft furnace and the pressure of the crown of the gasification furnace P1 are measured in real time; after the decarburization gas enters the shaft furnace, the decarburization cold gas enables the gas amount of a closed space at the bottom of the shaft furnace to be increased, the pressure at the P4 point at the bottom of the shaft furnace is locally increased through the energy conservation theory, and the flow rate of the decarburization gas is calculated in real time from the measured pressure difference between the pressure at the P4 point of a pressure field and the top pressure P1 of the arch of the gasification furnace; if the pressure difference P1-P4 is more than 0MPa, the detection and control system sends a control signal to the decarburization gas control valve to automatically and continuously open the opening adjustment valve to adjust the flow of the decarburization gas, so that the flow of the decarburization gas is adjusted until P1-P4 is less than or equal to 0 MPa; the pressure P0 of the decarbonized gas is stabilized at 0.4 MPa, the pressure P1 of the arch top of the gasification furnace is controlled at 0.15-0.32 MPa according to production requirements, and the flow setting range is 20000-250000 Nm3/h。
The invention has the beneficial effects that:
1) according to the method for inhibiting gas by inhibiting gas for inhibiting gas back-flowing of the shaft furnace of the Europe and metallurgy furnace, when hot gas directly comes from the vault of the gasification furnace, the gasification furnace is directly communicated with the bottom of the shaft furnace, and because the gas resistance loss of the channel is relatively small, the gas can be effectively inhibited from flowing back to the shaft furnace from the gasification furnace through the DRI (sponge iron) downcomer, so that a series of problems caused by gas back-flowing are avoided, the overhaul and maintenance of equipment are reduced, the bonding of the shaft furnace is reduced, the time interval for emptying the shaft furnace is prolonged, the production is more stable, the production cost is also reduced, and the operation rate of the shaft furnace is improved;
2) the coal gas back-flowing brings serious consequences to the shaft furnace, and the coal gas back-flowing is also caused by a plurality of reasons, wherein dust line faults, spiral blockage, downcomer blockage, coal gas pipe blockage and the like are caused; when the functional accuracy of the equipment can not well meet the requirement, local uneven airflow or dust quantity can be generated, so that the differential pressure on a gas pipeline is uneven, and the gas back-flowing degree and frequency can be seen; after the method is adopted, the method for restraining the gas from flowing back by the aid of the gas can be adopted after other equipment faults occur in the European and metallurgical furnace, so that the risk of flowing back is reduced to the minimum;
3) the top gas in the method of the invention is subjected to CO removal2CO in the post-reduction coal gas2Less than 1% by volume, CO + H2The content is more than 80 percent. After entering the shaft furnace, the indirect reduction reaction of iron oxide in the indirect reduction area of the shaft furnace can be increased, the metallization rate of the shaft furnace is improved, and the consumption of solid fossil fuel coke is reduced. Meanwhile, the deposition of furnace charge carbon at the bottom of the shaft furnace can be avoided, the erosion and abrasion of the materials can be slowed down, and the uniform falling of the materials can be facilitated.
4) The invention can make the gas flow in the shaft furnace uniformly distributed and the temperature field is reasonably distributed, thereby improving the metallization rate of the sponge iron, improving the gas utilization rate and the production efficiency of the shaft furnace, and reducing the fuel ratio and the production cost of the shaft furnace.
5) The gas conveying and processing system and the detection and control system of the decarburization gas control device are reliable and easy to operate, are convenient to maintain, can independently control the flow and the temperature of the reducing gas entering the central area of the shaft furnace, ensure that the gas flow in the shaft furnace is uniformly distributed, the temperature field and the pressure field are reasonably distributed, ensure that the gas flow of the shaft furnace is stable, the gas flow at the center and the edge is reasonably distributed, improve the gas utilization of the shaft furnace and improve the metallization rate of the shaft furnace.
Drawings
FIG. 1 is a schematic view of a method for suppressing gas blowback and gas suppression of a shaft furnace of an Ouguet furnace.
1, a shaft furnace; 2-a gasification furnace; 3, enclosing a pipe; 4-hot cyclone; 5- -a scrubber; 6-gas main pipe network; 7- -compressor; 8-raw gas generating pipe; 9- -DRI sponge iron downcomer; 10- -DRI sponge iron spiral; 11-a press; 12-a decarbonization unit; 13-decarbonization gas control valve; 14-decarbonization gas leading-in device; p0-press pressure; p1-pressure of the vault plant of the gasifier; P2-P6-pressure field in the shaft furnace; T1-T8-temperature field; description of the drawings: the temperature T and pressure P represent the temperature and pressure, respectively, of the corresponding sensing point in fig. 1.
Detailed Description
A method for restraining gas from channeling reversely by gas for a vertical furnace of an Ou smelting furnace, 1), a hole is formed at the bottom of the vertical furnace 1, a decarburized gas leading-in device 14 is vertically arranged in the central area of the bottom of the vertical furnace, the decarburized gas leading-in device is built by a combined body of a circular truncated cone, an upper cylinder, a circular truncated cone, a middle cylinder and a lower cylinder and made of high-alumina chromium refractory materials sequentially from top to bottom, upper and lower layers of rectangular gas outlet holes are uniformly distributed in the upper cylinder at intervals in the circumferential direction, a central channel is arranged in the combined body in a penetrating manner from top to bottom, the cylinder at the lower part of the combined body is arranged on the bottom of the reduction furnace, namely the furnace 1, and the vertical furnace is arranged on a bottom hole penetrating through the bottom of the vertical furnace and a shell, a side hole is formed at the lower part of the vertical furnace, and the decarburized gas control valve 13 is connected;
2) the top gas delivered through the gas main pipe network 6 is pressurized by a pressurizing machine 11, and CO in the gas is removed through a decarbonization device 122Then, the decarbonized gas is sent to the decarbonized gas leading-in device 14 through a decarbonized gas pipeline, and the flow rate and the temperature of the decarbonized gas are measured in real time; the decarbonized gas passes through a decarbonized gas control valve 13 and a decarbonized gas leading-in device 14 and then is discharged from the rectangular gas outlet, the decarbonized cold gas and hot gas in the shaft furnace are mixed, the temperature of a temperature field T5 around the bottom of the decarbonized gas leading-in device is set to be 900 ℃, the temperature of the temperature field T5 at the position of the shaft furnace 1 is detected in real time after the cold gas and the hot gas are mixed, and the decarbonized gas flow is calculated in real time from the measured temperature field T5 according to the heat balance principle before and after the gas is mixed; if the actual value of the temperature field T5 deviates from the set value, the detection and control system sends a control signal to the decarburization gas control valve 13 to automatically and continuously adjust the opening degree and adjust the flow rate of the decarburization gas until the temperature of the shaft furnace temperature field T5 reaches the set value required by production; pressurizing the decarbonized coal gas by a pressurizing machine 11, and after decarbonization is carried out by a decarbonizing device 12, controlling the temperature to be 60 ℃; the setting range of the flow rate of the decarbonized gas is 20000 to 250000Nm3/h；
After the invention is used, the temperature field distribution is T5=900 ℃, T6=850 ℃, T7=800 ℃, T8=700 ℃, and the temperature field of the whole shaft furnace is controlled to be less than 900 ℃.
3) The pressure field in the shaft furnace 1 is distributed with two modes: the first mode is as follows: p0 > P4 > P1 > P5, mode II, the pressure at the bottom of the shaft furnace is maintained to be equal to the pressure at the arch crown of the gasification furnace, P0 > P1= P4 > P5, and the concrete top gas is pressurized by a pressurizing machine and is subjected to CO removal from the gas through a decarbonization device2Then, the gas is sent to a decarburization gas leading-in device at the lower part of the shaft furnace through a decarburization gas pipeline, and the pressure of the decarburization gas, the pressure at the P4 point at the bottom of the shaft furnace and the pressure of the crown of the gasification furnace P1 are measured in real time; after the decarburization gas enters the shaft furnace, the decarburization cold gas enables the gas amount of a closed space at the bottom of the shaft furnace to be increased, the pressure at the P4 point at the bottom of the shaft furnace is locally increased through the energy conservation theory, and the flow rate of the decarburization gas is calculated in real time from the measured pressure difference between the pressure at the P4 point of a pressure field and the top pressure P1 of the arch of the gasification furnace; if the pressure difference P1-P4 is more than 0MPa, the detection and control system sends a control signal to the decarburization gas control valve to automatically and continuously open the opening adjustment valve to adjust the flow of the decarburization gas, so that the flow of the decarburization gas is adjusted until P1-P4 is less than or equal to 0 MPa; the pressure P0 of the decarbonized gas is stabilized at 0.4 MPa, the pressure P1 of the arch top of the gasification furnace is controlled at 0.15-0.32 MPa according to production requirements, and the flow setting range is 20000-250000 Nm3/h。
The invention discloses a method for restraining gas reverse channeling of gas and restraining gas by a shaft furnace of an Ou-smelting furnace, which comprises the following steps: the bottom of the shaft furnace is provided with a hole, a decarbonization gas leading-in device is arranged, the top gas is pressurized by a pressurizing machine, and CO in the gas is removed by the decarbonization device2Then CO + H in decarbonized gas2High-reduction coal gas with the content of more than 80 percent is sent to a decarburization coal gas leading-in device at the lower part of the shaft furnace through a decarburization coal gas pipeline, and the flow, the pressure and the temperature of the decarburization coal gas are measured in real time; after the decarbonized coal gas passes through the decarbonized coal gas control device and the decarbonized coal gas leading-in device, 2 circles of rectangular holes are distributed on the cylindrical circumference of the lower part of the circular table at the top of the combination body of the decarbonized coal gas leading-in device to lead out, as shown in figure 1, the led-out decarbonized cold coal gas is mixed with hot coal gas in the shaft furnace, so that the coal gas flow distribution in the shaft furnace is changed, a temperature field and a pressure field are reasonably distributed, and the purpose of inhibiting the reverse channeling of the decarbonized cold coal gas is achieved.
The invention changes the harm of bonding of the shaft furnace caused by the fact that the third coal gas flow of the coal gas back-flowing in the production is flowed into the shaft furnace from the gasification furnace, the coal gas regulating valve of the decarburization coal gas control device is arranged on the decarburization coal gas pipeline outside the shaft furnace, the amount of decarburization cold coal gas entering the central area of the shaft furnace from the decarburization coal gas leading-in device is controlled, meanwhile, the metallization rate of DRI (sponge iron) is improved, the coal gas utilization rate and the production efficiency of the shaft furnace are improved, and the fuel ratio and the production cost of the Europe smelting furnace are reduced.
Example 1 (P1 = P4):
1) the smelting rate is 150 t/h.
2) Flow rate of decarbonized gas 15000Nm3/h。
3) The vault temperature is controlled to be about 1050 ℃.
4) And controlling the oxygen content of the tuyere. The oxygen consumption of the tuyere is controlled to be 275-285 Nm3T. between iron.
5) And (3) controlling the pressure of the factory: 260 kPa.
6) Differential pressure of the shaft furnace: 55 kPa.
7) The pressure difference of the surrounding pipe: 35 kPa.
8) The top temperature of the shaft furnace: 230 ℃ to 230 ℃.
9) Reducing the gas temperature: 835 ℃ C.
10) Consumption of top coal gas: 800 Nm3And (c) t ore.
11) The coke ratio is controlled to be 180-200 kg/t iron.
Table 1: and parameters of gas-suppressing temperature and pressure field are as follows:
example 2 (P4 > P1):
1) the smelting rate is 160 t/h.
2) Decarbonized gas flow rate of 20000Nm3/h。
3) The vault temperature is controlled to be about 1050 ℃.
4) And controlling the oxygen content of the tuyere. The oxygen consumption of the tuyere is controlled to be 265-275 Nm3T. between iron.
5) And (3) controlling the pressure of the factory: 280 kPa.
6) Differential pressure of the shaft furnace: 60 kPa.
7) The pressure difference of the surrounding pipe: 38 kPa.
8) The temperature of the top of the vertical furnace: at 240 ℃.
9) Reducing the gas temperature: 845 deg.C.
10) Consumption of top coal gas: 830 Nm3And (c) t ore.
11) The coke ratio is controlled to be 160-190 kg/t iron.
Table 2: and parameters of gas-suppressing temperature and pressure field are as follows:
the embodiment of the invention discloses that the pressure P4 in the shaft furnace is properly increased to be larger than the vault P1 of the gasification furnace, the coal gas back-flow of the shaft furnace of the Europe smelting furnace is solved, the pressure difference of the shaft furnace goes upwards to some extent, but the stable and smooth running of the shaft furnace is not influenced, and the introduction of the decarbonized coal gas is increased (15000 Nm & lt/EN & gt)3H to 20000Nm3And/h), the reduction atmosphere in the furnace is increased, which is more beneficial to the improvement of the metallization rate of the shaft furnace, the improvement of the smelting rate of the Europe and metallurgy furnace, the reduction of the coke ratio and the reduction of the production cost.
In summary, the method of the invention is a method for changing a gas feeding mode of a vertical furnace of an Europe smelting furnace and a pressure field of the vertical furnace to improve local pressure difference of the vertical furnace to inhibit gas from flowing backwards so as to inhibit gas, and the method comprises the steps of introducing decarburization cold gas at the bottom of the vertical furnace, controlling the pressure and flow of the decarburization cold gas by using a decarburization gas control device, changing the temperature field and the pressure field at the bottom of the vertical furnace, increasing the amount of the cold gas at the bottom of the vertical furnace, weakening the phenomenon that high-temperature gas at 1050 ℃ of a gasification furnace directly flows into the vertical furnace through a DRI (sponge iron) descending pipe and a DRI (sponge iron) spiral, causing the phenomenon that the vertical furnace is bonded due to overhigh temperature, eliminating the influence on the spiral discharging rate, fuel ratio and smelting rate of the DRI (sponge iron), and enabling the Europe smelting furnace to operate stably.
Claims (1)
1. A method for restraining gas by inhibiting gas back-flowing of coal gas of a shaft furnace of an Ou smelting furnace is characterized by comprising the following steps:
1) the bottom of the shaft furnace is provided with a hole, the central area of the bottom of the shaft furnace is vertically provided with a decarburization coal gas leading-in device which is built by a combination of a circular truncated cone, an upper cylinder, a circular truncated cone, a middle cylinder and a lower cylinder from top to bottom in sequence and by using a high-aluminum chromium refractory material, the upper cylinder is internally provided with an upper rectangular air outlet and a lower rectangular air outlet which are uniformly distributed at intervals in the circumferential direction, the inside of the combination is provided with a central channel in a through way from top to bottom, the lower cylinder of the combination is arranged on the bottom of the reduction furnace and is arranged on a bottom hole penetrating through the bottom of the shaft furnace and a shell, and the lower part of the combination is provided with a side hole and is connected with a decarburization coal gas control valve;
2) pressurizing the top gas by a pressurizing machine, and removing CO in the gas by a decarbonization device2Then, the decarbonized gas is sent to the decarbonized gas leading-in device through a decarbonized gas pipeline, and the flow and the temperature of the decarbonized gas are measured in real time; the decarbonized gas is discharged from the rectangular gas outlet after passing through a decarbonized gas control valve and a decarbonized gas leading-in device, the decarbonized cold gas is mixed with hot gas in the shaft furnace, the temperature of a temperature field T5 around the bottom of the decarbonized gas leading-in device is set to be 900 ℃, the temperature of the temperature field T5 at the position after cold gas and hot gas in the shaft furnace are mixed is detected in real time, according to the heat balance principle before and after the gas is mixed, the actual judgment is carried out from the measured temperature of the temperature field T5, if the actual value of the temperature field T5 is deviated from the set value, a detection and control system sends a control signal to the decarbonized gas control valve, so that the decarbonized gas control valve automatically and continuously adjusts the opening degree, and the flow of the decarbonized gas is adjusted until the temperature of the temperature field T5 of the shaft furnace reaches the set value required by production; pressurizing the decarbonized coal gas by a pressurizing machine, and controlling the temperature of the decarbonized coal gas to be 60 ℃ after the decarbonization of a decarbonization device; the setting range of the flow rate of the decarbonized gas is 20000 to 250000Nm3/h；
3) The pressure field distribution in the shaft furnace has two modes: the first mode is as follows: p0 > P4 > P1 > P5, mode II, the pressure at the bottom of the shaft furnace is maintained to be equal to the pressure at the arch crown of the gasification furnace, P0 > P1= P4 > P5, and the concrete top gas is pressurized by a pressurizing machine and is subjected to CO removal from the gas through a decarbonization device2Then, the gas is sent to a decarburization gas leading-in device at the lower part of the shaft furnace through a decarburization gas pipeline, and the pressure of the decarburization gas, the pressure at the P4 point at the bottom of the shaft furnace and the pressure of the crown of the gasification furnace P1 are measured in real time; after the decarbonized gas enters the shaft furnace, the decarbonized cold gas increases the gas quantity of the closed space at the bottom of the shaft furnace, and the bottom P4 of the shaft furnace passes through the theory of energy conservationThe point pressure is locally increased, and the decarbonized gas flow is calculated in real time from the actual pressure difference result of the measured point pressure P4 of the pressure field and the top pressure P1 of the gasification furnace; if the pressure difference P1-P4 is more than 0MPa, the detection and control system sends a control signal to the decarburization gas control valve to automatically and continuously open the opening adjustment valve to adjust the flow of the decarburization gas, so that the flow of the decarburization gas is adjusted until P1-P4 is less than or equal to 0 MPa; the pressure P0 of the decarbonized gas is stabilized at 0.4 MPa, the pressure P1 of the arch top of the gasification furnace is controlled at 0.15-0.32 MPa according to production requirements, and the flow setting range is 20000-250000 Nm3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210137944.8A CN114480766B (en) | 2022-02-15 | 2022-02-15 | Method for restraining reverse gas channeling of coal gas and restraining gas of European smelting furnace shaft furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210137944.8A CN114480766B (en) | 2022-02-15 | 2022-02-15 | Method for restraining reverse gas channeling of coal gas and restraining gas of European smelting furnace shaft furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116377155A (en) * | 2023-02-24 | 2023-07-04 | 新疆八一钢铁股份有限公司 | CGD operation control method for reduction shaft furnace of European smelting furnace |
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| CN103184301A (en) * | 2011-12-27 | 2013-07-03 | 宝钢集团有限公司 | Method for controlling gas backflow in melting reduction smelting |
| US20160002744A1 (en) * | 2013-02-27 | 2016-01-07 | Hyl Technologies S.A. De C.V. | Direct reduction process with improved product quality and process gas efficiency |
| CN107502694A (en) * | 2017-08-16 | 2017-12-22 | 宝钢工程技术集团有限公司 | A kind of shaft furnace inlet duct and shaft furnace air inlet method |
| CN109929958A (en) * | 2019-04-25 | 2019-06-25 | 中冶赛迪技术研究中心有限公司 | Utilize the method and system of Ou Yelu gasification furnace output coal gas production direct reduced iron |
| CN111748667A (en) * | 2020-07-07 | 2020-10-09 | 新疆八一钢铁股份有限公司 | Iron-smelting method for reducing fuel ratio of Europe smelting furnace |
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| CN103184301A (en) * | 2011-12-27 | 2013-07-03 | 宝钢集团有限公司 | Method for controlling gas backflow in melting reduction smelting |
| US20160002744A1 (en) * | 2013-02-27 | 2016-01-07 | Hyl Technologies S.A. De C.V. | Direct reduction process with improved product quality and process gas efficiency |
| CN107502694A (en) * | 2017-08-16 | 2017-12-22 | 宝钢工程技术集团有限公司 | A kind of shaft furnace inlet duct and shaft furnace air inlet method |
| CN109929958A (en) * | 2019-04-25 | 2019-06-25 | 中冶赛迪技术研究中心有限公司 | Utilize the method and system of Ou Yelu gasification furnace output coal gas production direct reduced iron |
| CN111748667A (en) * | 2020-07-07 | 2020-10-09 | 新疆八一钢铁股份有限公司 | Iron-smelting method for reducing fuel ratio of Europe smelting furnace |
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| CN116377155A (en) * | 2023-02-24 | 2023-07-04 | 新疆八一钢铁股份有限公司 | CGD operation control method for reduction shaft furnace of European smelting furnace |
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