CN110257576B - Reducing synchronous coupling blast furnace tuyere injection device and injection method - Google Patents
Reducing synchronous coupling blast furnace tuyere injection device and injection method Download PDFInfo
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- CN110257576B CN110257576B CN201910649092.9A CN201910649092A CN110257576B CN 110257576 B CN110257576 B CN 110257576B CN 201910649092 A CN201910649092 A CN 201910649092A CN 110257576 B CN110257576 B CN 110257576B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008878 coupling Effects 0.000 title claims abstract description 13
- 238000010168 coupling process Methods 0.000 title claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 13
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 12
- 238000002347 injection Methods 0.000 title claims description 20
- 239000007924 injection Substances 0.000 title claims description 20
- 239000007921 spray Substances 0.000 claims abstract description 60
- 238000007664 blowing Methods 0.000 claims abstract description 49
- 239000000446 fuel Substances 0.000 claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 30
- 239000012159 carrier gas Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052742 iron Inorganic materials 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract description 3
- 239000003034 coal gas Substances 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 6
- 238000005192 partition Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention provides a blowing device and a blowing method for a reducing synchronous coupling blast furnace tuyere, which aim at the problems of the blast furnace tuyere in the prior art, and belong to the technical field of iron making. The device comprises a spray head and a spray body connected with the spray head, wherein the spray head is in a circular table shape or one end is in a circular table shape, the other end is in a cylindrical shape, the spray body is in a cylindrical shape, a main spray pipe is arranged at the axle center of the spray body and extends to the spray head to form a main spray nozzle, a plurality of auxiliary spray pipes are uniformly distributed around the main spray pipe and extend to the spray head to form auxiliary spray nozzles, and the auxiliary spray pipes are bent at the joint of the spray head and the spray body and axially form an angle of not more than 30 degrees with the spray body. The device can spray solids and gas, and when fuel is sprayed, fuel particles are attached to objects to increase the reaction surface area and improve the heat efficiency; the resource can be reused for blowing metallurgical dust, hot blast stove waste gas, surplus coal gas and the like; the impact depth and the impact area of the device sprayed into the blast furnace tuyere area are increased.
Description
Technical Field
The invention belongs to the technical field of iron making, and particularly relates to a device and a method for blowing solid particles and gas through a reducing synchronous coupling blast furnace tuyere.
Background
The tuyere of an iron-making blast furnace is generally used for blowing high-temperature hot air and oxidizing and burning bottom coke to generate CO. However, the design mode of the tuyere is single, so that the blowing area and the blowing length are small, the efficiency is low, and the tuyere is not suitable for blowing solids and liquid.
The prior art has the following improvements to the tuyere: the utility model provides a blast furnace cooling tuyere, application number is CN201811526001.4, discloses the tuyere, including preceding cap, well cap, back cap, preceding cap, well cap and back cap enclose into a cavity structure; a partition plate is arranged between the front cap and the middle cap to divide the cavity structure into a front cavity and a rear cavity; a cooling water inlet pipe and a cooling water outlet pipe are arranged in the rear cavity, a partition plate water inlet hole and a partition plate water outlet hole are arranged on the partition plate, and the cooling water inlet pipe and the cooling water outlet pipe are respectively communicated with the partition plate water inlet hole and the partition plate water outlet hole; the front cavity is internally provided with a front cavity baffle plate, and the front cavity baffle plate is positioned between the baffle plate water inlet hole and the baffle plate water outlet hole. The tuyere can improve the cooling capacity of the tuyere small sleeve, and can eliminate the hidden danger of water leakage caused by the traditional casting structure, so as to prolong the service life of the tuyere, improve the use quality and improve the combustion rate. However, the cooling tuyere of the blast furnace does not consider the reduction of heat efficiency after cooling and does not consider the energy saving and efficiency improvement problems.
Disclosure of Invention
The invention provides a blowing device and a blowing method for a reducing synchronous coupling blast furnace tuyere, which aims at the problems of the blast furnace tuyere in the prior art. The device can spray both solid and gas, and when fuel is sprayed, fuel particles are attached to objects to increase the reaction surface area and improve the heat efficiency; the method can also recycle the resources, such as injection metallurgical dust, hot blast stove waste gas, excess gas and the like, and is matched with a blast furnace process system; the impact depth and the impact area of the device sprayed into the blast furnace tuyere area are increased.
According to one of the technical schemes, the blowing device for the reducing synchronous coupling blast furnace tuyere consists of a nozzle and a blowing body connected with the nozzle, wherein the nozzle is in a round table shape or one end is in a round table shape, the other end is in a cylinder, the blowing body is in a cylinder, a main spray pipe is arranged at the axle center of the blowing body and extends to the nozzle to form a main spray nozzle, a plurality of auxiliary spray pipes are uniformly distributed around the main spray pipe and extend to the nozzle to form auxiliary spray nozzles, and the auxiliary spray pipes are bent at the joint of the nozzle and the blowing body and axially form an angle of not more than 30 degrees with the blowing body;
further, the diameter phi of the jetting body is 50-200mm, the length of the main jet pipe is 0.2-10m, the diameter phi of the main jet pipe is 20-70mm, and the diameter phi of the auxiliary jet pipe is 10-20mm;
further, the number of the auxiliary spray pipes is 4-16;
further, the auxiliary nozzles are positioned on 1 or 2 circles concentric with the center of the main nozzle.
The second technical scheme of the invention is that the method for injecting fuel particles by the reducing synchronous coupling blast furnace tuyere injection device comprises the following specific operation steps:
1) Calculating the total injection amount of fuel particles:
calculating the total injection amount of fuel particles according to y=0.2alpha+3.4beta+7.3gamma;
wherein: y-fuel particle injection amount, unit: ton of water;
α—a blast furnace forward coefficient, α=0-10 (blast furnace forward coefficient is related to heat energy conversion efficiency);
beta-fuel particle influencing factor, beta=0-10 (fuel particle influencing factor is related to fuel ratio);
gamma-blast furnace tapping factor, gamma=0-10 (blast furnace tapping factor is related to tapping);
2) Adjusting the blowing parameters of the blowing device
The fuel particles are sprayed into the blast furnace by taking gas as a carrier, the diameter of the fuel particles is 50nn-2mm, and the particle size of the fuel particles is uniform; control carrier gas pressure range: controlling the fluid turbulence intensity of carrier gas at 0.1Mpa-15 Mpa: 0.2-3.6m 2 /s 2 The method comprises the steps of carrying out a first treatment on the surface of the Controlling the length of the main spray pipe to be 0.2m-10m; controlling the blowing time to be 0.1-1.2 h; the temperature of the fuel particles and the carrier gas at the outlet of the device is controlled to be 950-the highest furnace temperature of the blast furnace.
Further, the carrier gas is hot blast stove waste gas, surplus coal gas or prepared carrier gas.
The third technical scheme of the invention is that the method for blowing gas by the reducing synchronous coupling blast furnace tuyere blowing device comprises the following specific operation steps:
total pressure range of control gas: 0.1Mpa-15Mpa; controlling the length of the main spray pipe to be 0.2m-10m; the blowing time is 0.5-2.5h; controlling the temperature of the gas at the outlet of the device to be 950-the highest furnace temperature of the blast furnace
Further, the gas is oxygen, air or gas fuel; wherein the air comprises recycled exhaust gas and the gaseous fuel comprises waste recycled fuel, such as excess gas.
Compared with the prior art, the invention has the advantages that:
1. the injection device of the invention injects fuel through the air port by the air supplyOr the gas is injected into the blast furnace, the high-temperature low-density hot gas injected by the tuyere drives the fuel to be injected into the blast furnace, the relative speed and momentum exchange of the several fuels of the gas of the injection device are reduced to the greatest extent, so that the dust jet in the center of the gas can obtain larger range, and CO is reduced 2 And the atmospheric emission is optimized, the coking coal ratio is reduced, the injection area is increased, and the resource recovery efficiency is improved.
2. By adopting the device, the operation of far and near adjustable spraying distance can be realized in the blast furnace tuyere convolution zone according to the process requirement.
Drawings
Fig. 1 is a schematic view of the blowing device in example 1.
Fig. 2 and 1 are cross-sectional views taken along the AA section.
Wherein, 1, a spray head, 2, a spray body, 3, a main spray pipe, 4, a main nozzle, 5, a secondary nozzle, 6 and a secondary nozzle.
Detailed Description
Example 1
The utility model provides a reducing synchro coupling blast furnace tuyere jetting device, by shower nozzle 1 and the jetting body 2 that connects with the shower nozzle constitute, shower nozzle 1 is round platform shape or one end is round platform shape and the other end is cylindrical, jetting body 2 is cylindrical, is equipped with main spray pipe 3 and main spray pipe extends to the shower nozzle and forms main spout 4 in the axle center of jetting body, evenly distributed a plurality of auxiliary spray pipes 5 around main spray pipe and auxiliary spray pipe extends to the shower nozzle and forms auxiliary spout 6, the auxiliary spray pipe is buckled in shower nozzle and jetting body junction, forms θ and is less than or equal to 30 ° with jetting body axial; the diameter phi=50-200 mm of the blowing body, the length of the main jet pipe is 0.2-10m, the diameter phi=20-70 mm of the main jet pipe, the diameter phi=10-20 mm of the auxiliary jet pipe, the number of the auxiliary jet pipes is 4-16, and the auxiliary jet pipes are positioned on 1 or 2 circles concentric with the center of the main jet pipe.
In this embodiment, as shown in fig. 1 and 2, one end of the spray head 1 is in a shape of a truncated cone, the other end of the spray head is in a cylindrical shape, the number of secondary spray pipes 5 is 16, and the secondary spray pipes 6 are positioned on 2 circles concentric with the center of the main spray pipe 4.
Example 2
The blast furnace volume was 1200m by using the reducing synchronous coupling blast furnace tuyere injection device of example 1 3 -5500m 3 The method for blowing coal powder particles at the temperature range of 1750-1950 ℃ of the blast furnace comprises the following specific operation steps:
the physical quantity requirements of the pulverized coal particles are as follows:
wherein θ=30°, the length of the main nozzle is 0.32m, the diameter Φ=20 mm of the main nozzle, the diameter Φ=10 mm of the auxiliary nozzle, the number of the auxiliary nozzles is 16, and the outlet ends of the auxiliary nozzles are distributed on 2 circles concentric with the outlet of the main nozzle.
1) Calculating the total amount of fuel particle injection
The amount of the smelting pulverized coal added into the blast furnace according to the process requirement ranges from 120 kg to 220kg;
taking the blast furnace forward coefficient alpha=0.5 (the blast furnace forward coefficient is obtained according to the heat energy conversion efficiency, the heat energy conversion efficiency refers to the available energy output by an energy conversion device, and the conversion efficiency refers to a dimensionless number between 0 and 1 relative to the ratio of the input energy;
taking the particle impact factor β=0.07 (the fuel particle impact factor is derived from the fuel ratio, which is a dimensionless number between 0 and 1, which is the ratio of fixed carbon to volatile matter);
tapping the iron level influencing factor gamma=0.01 (the blast furnace iron level influencing factor is obtained according to the iron level, and the iron level is determined according to the ratio of iron-containing ore to the iron level;
the total amount of coal powder nano particles sprayed into the furnace is y=0.411 tons by calculating y=0.2α+3.4β+7.3γ.
2) Adjusting parameters
The outlet pressure of the blowing device is 0.1-3 Mpa, and the fluid turbulence intensity of the carrier gas is: 2.3m 2 /s 2 The method comprises the steps of carrying out a first treatment on the surface of the Blowing time is 0.8h, carrier gas and particle temperature of tuyereIs 950 ℃.
Compared with the existing single-tube spray gun with the same length and the same diameter, the coke ratio is reduced by 7.2%, the spraying distance is increased by 6.4%, and the spraying area is increased by 5.3%.
Example 3
The blast furnace volume was 1200m by using the reducing synchronous coupling blast furnace tuyere injection device of example 1 3 -4200m 3 The blast furnace temperature range 950-1200 deg.c for blowing gas includes the following steps:
θ=6°, the length of the main nozzle is 0.27m, the diameter Φ=40 mm of the nozzle, the diameter Φ=15 mm of the secondary nozzle, the number of secondary nozzles is 8, and the outlet ends of the secondary nozzles are distributed on 1 circle concentric with the outlet of the main nozzle.
The outlet pressure of the blowing device is 0.1-3 Mpa, and the fluid turbulence intensity of the gas is: 2.7m 2 /s 2 The method comprises the steps of carrying out a first treatment on the surface of the The blowing time is 0.7h, and the air temperature of the air port is 950 ℃.
Compared with the existing single-tube spray gun with the same length and the same diameter, 1) the spray length is increased by 8.2% under the same spray pressure; 2) Improving the impact depth of the injected gas and reducing CO 2 The atmospheric emission is 5.6%, and the coking coal ratio is optimally reduced by 7.8%; 3) The blowing area is increased by 6.5%, the waste gas yield is improved by 9.7%, and the carbon yield is improved by 5.4%.
Claims (10)
1. A method for blowing fuel particles by a different-diameter synchronous coupling blast furnace tuyere blowing device, which consists of a nozzle and a blowing body connected with the nozzle, wherein the nozzle is in a round table shape or one end is in a round table shape, the other end is in a cylinder shape, the blowing body is in a cylinder shape, a main spray pipe is arranged at the axle center of the blowing body and extends to the nozzle to form a main spray nozzle, a plurality of auxiliary spray pipes are uniformly distributed around the main spray pipe and extend to the nozzle to form auxiliary spray nozzles, the auxiliary spray pipes are bent at the joint of the nozzle and the blowing body and form an angle of not more than 30 degrees with the axial direction of the blowing body,
the method is characterized by comprising the following specific operation steps:
1) Calculating the total injection amount of fuel particles:
calculating the total injection amount of fuel particles according to y=0.2alpha+3.4beta+7.3gamma;
wherein: y-fuel particle injection amount, unit: ton of water;
α—the blast furnace forward coefficient, α=0-10;
beta-fuel particle influencing factor, beta=0-10;
gamma-blast furnace tapping impact factor, gamma=0-10;
2) Adjusting the blowing parameters of the blowing device
The fuel particles are sprayed into the blast furnace by taking gas as a carrier, the diameter of the fuel particles is 50nn-2mm, and the particle size of the fuel particles is uniform; control carrier gas pressure range: 0.1MPa-15MPa, controlling the fluid turbulence intensity of the carrier gas: 0.2-3.6m 2 /s 2 The method comprises the steps of carrying out a first treatment on the surface of the Controlling the length of the main spray pipe to be 0.2m-10m; controlling the blowing time to be 0.1-1.2 h; the temperature of the fuel particles and the carrier gas at the outlet of the device is controlled to be 950-the highest furnace temperature of the blast furnace.
2. A method of injecting fuel particles as claimed in claim 1, wherein the injection body has a diameter Φ=50-200 mm, a primary nozzle length of 0.2-10m, a primary nozzle diameter Φ=20-70 mm, and a secondary nozzle diameter Φ=10-20 mm.
3. The method of injecting fuel particles as defined in claim 1, wherein said number of secondary nozzles is 4-16.
4. A method of injecting fuel particles as claimed in claim 1, wherein said secondary nozzle is located on 1 or 2 circles concentric with the centre of the primary nozzle.
5. The method of injecting fuel particles as claimed in claim 1, wherein the carrier gas is hot blast stove exhaust gas, surplus gas or prepared carrier gas.
6. A method for blowing gas by a different-diameter synchronous coupling blast furnace tuyere blowing device, which consists of a nozzle and a blowing body connected with the nozzle, wherein the nozzle is in a shape of a circular table or one end of the nozzle is in a shape of a circular table, the other end of the nozzle is in a shape of a cylinder, the blowing body is in a shape of a cylinder, a main spray pipe is arranged at the axle center of the blowing body and extends to the nozzle to form a main spray nozzle, a plurality of auxiliary spray pipes are uniformly distributed around the main spray pipe and extend to the nozzle to form auxiliary spray nozzles, the auxiliary spray pipes are bent at the joint of the nozzle and the blowing body and form an angle of not more than 30 degrees with the axial direction of the blowing body,
the method is characterized by comprising the following specific operation steps:
control gas pressure range: 0.1MPa to 15MPa; controlling the length of the main spray pipe to be 0.2m-10m; the blowing time is 0.5-2.5h; the temperature of the gas at the outlet of the device is controlled to be 950-the highest furnace temperature of the blast furnace.
7. The method of injecting gas as defined in claim 6, wherein said gas is oxygen, air, or gaseous fuel.
8. The method of injecting gas as defined in claim 6, wherein the diameter of the injection body Φ=50-200 mm, the length of the main nozzle is 0.2-10m, the diameter of the main nozzle Φ=20-70 mm, and the diameter of the secondary nozzle Φ=10-20 mm.
9. The method of injecting gas as defined in claim 6, wherein said number of secondary nozzles is 4-16.
10. The method of injecting gas as defined in claim 6, wherein said secondary nozzle is located on 1 or 2 circles concentric with the center of the primary nozzle.
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