CN219839740U - High-efficient device of utilizing of blast furnace grain slag vertical mill system waste gas waste heat - Google Patents
High-efficient device of utilizing of blast furnace grain slag vertical mill system waste gas waste heat Download PDFInfo
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- CN219839740U CN219839740U CN202320298620.2U CN202320298620U CN219839740U CN 219839740 U CN219839740 U CN 219839740U CN 202320298620 U CN202320298620 U CN 202320298620U CN 219839740 U CN219839740 U CN 219839740U
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- 239000002893 slag Substances 0.000 title claims abstract description 43
- 239000002912 waste gas Substances 0.000 title claims abstract description 21
- 239000002918 waste heat Substances 0.000 title claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 71
- 239000007789 gas Substances 0.000 claims abstract description 62
- 238000009826 distribution Methods 0.000 claims abstract description 38
- 238000002485 combustion reaction Methods 0.000 claims description 38
- 238000009792 diffusion process Methods 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 9
- 238000009825 accumulation Methods 0.000 claims description 4
- 238000005338 heat storage Methods 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 abstract description 28
- 239000000446 fuel Substances 0.000 abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 18
- 238000000227 grinding Methods 0.000 abstract description 4
- 239000000843 powder Substances 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 133
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 31
- 239000003546 flue gas Substances 0.000 description 31
- 238000000034 method Methods 0.000 description 24
- 230000008569 process Effects 0.000 description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000004568 cement Substances 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- -1 comprise co2 Chemical compound 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
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- 238000006479 redox reaction Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The utility model relates to the technical field of blast furnace water slag powder grinding, and discloses a high-efficiency utilization device for waste gas and waste heat of a blast furnace water slag vertical grinding system, which comprises a gas hot-blast stove, wherein a hearth and an air mixing chamber are arranged in the gas hot-blast stove, a burner which extends gas to the outer side of the hot-blast stove is arranged on the inner side of the gas hot-blast stove, a secondary burner air distribution device is arranged in the hearth and positioned on the periphery of the burner, a preheating air supply adjusting device is arranged at the furnace end of the gas hot-blast stove, a secondary hearth air distribution device is arranged at the furnace end of the gas hot-blast stove, and a tertiary hearth air distribution device is arranged at the tail part of the gas hot-blast stove. The high-efficiency utilization device for the waste heat of the waste gas of the blast furnace water slag vertical mill system obviously improves the utilization ratio of the circulating smoke of the blast furnace water slag vertical mill system, reduces the fuel consumption, can effectively reduce the emission of NOX in the waste gas of the vertical mill system, and improves the energy-saving and environment-friendly level of the blast furnace water slag vertical mill system.
Description
Technical Field
The utility model relates to the technical field of blast furnace granulated slag grinding, in particular to a device for efficiently utilizing waste heat of waste gas of a blast furnace granulated slag vertical grinding system.
Background
Blast furnace water quenched slag, also called blast furnace slag, is a byproduct produced by blast furnace iron making, and has a long history of application in the cement industry, also called mineral powder, in which slag is one of the main mixtures for producing cement. When the cement clinker is applied to the field of cement production, the slag is ground independently through a blast furnace slag vertical mill production process, the activity of the slag is excited, and the slag is mixed with finished cement, so that the later strength of the cement is ensured, the using amount of cement clinker is reduced, the resource program exploitation is reduced, the environmental pollution is reduced, the ecological environment is protected, the industrial waste is absorbed to the maximum extent, and the comprehensive utilization level of cement resources is improved.
In the production process of the blast furnace slag vertical mill, the utilization efficiency of the circulating flue gas is an important energy-saving and environment-friendly index, because in the process, the system circulating flue gas is generally 85-105 ℃, the components in the circulating flue gas mainly comprise co2, unburned partial fuel gas, NOX and saturated steam, and the nitrogen component and the oxygen content are far lower than those of the ambient air.
In the using process of the existing blast furnace slag vertical mill device, the circulating smoke ratio of the common process is usually 30% -75% due to process limitation, the arrangement defect of combustion air and temperature-regulating smoke cannot ensure the burnout rate of fuel, and meanwhile, the combustion and temperature control are participated by using a larger air coefficient, so that the oxygen content of a hearth cannot be controlled to realize low nitrogen emission, and the pollution is larger in use.
Therefore, a device for efficiently utilizing waste heat of waste gas of a blast furnace granulated slag vertical mill system is provided to solve the problems.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the utility model provides the high-efficiency utilization device for the waste heat of the waste gas of the vertical mill system of the blast furnace water slag, which has the advantages of obviously improving the utilization ratio of the circulating smoke gas of the vertical mill system of the blast furnace water slag, reducing the fuel consumption, effectively reducing the emission of NOX in the waste gas of the vertical mill system, improving the energy conservation and environmental protection level of the vertical mill system of the blast furnace water slag, and the like, and solves the problems that the existing vertical mill device of the blast furnace water slag is generally 30-75% in the using process, the circulating smoke gas of the common process accounts for the process limitation, the arrangement defect of combustion air and temperature-regulating smoke gas cannot ensure the burnout rate of fuel, and the combustion and temperature control cannot be realized due to the fact that the larger air coefficient is used, so that the oxygen content of a hearth cannot be controlled to realize low nitrogen emission, and the pollution is also larger in the using process.
(II) technical scheme
The technical scheme for solving the technical problems is as follows: the utility model provides a high-efficient device that utilizes of blast furnace grain slag vertical mill system waste gas waste heat, includes the gas hot-blast furnace, be provided with furnace and air mixing chamber in the gas hot-blast furnace, the inboard of gas hot-blast furnace is provided with the combustor that extends gas to the hot-blast furnace outside, in the furnace and be located the combustor periphery and be provided with combustor secondary air distribution device, gas hot-blast furnace end department is provided with the air preheating moisturizing adjusting device, gas hot-blast furnace end department is provided with furnace secondary air distribution device, gas hot-blast furnace afterbody is provided with the three air distribution device of chamber, be provided with the air conditioning air distribution device in the air mixing chamber, gas hot-blast furnace afterbody is provided with the three air distribution device of furnace, the air mixing chamber intercommunication has the air mixing chamber, the outside of air mixing chamber is through the pipeline intercommunication has vertical mill, the outside of vertical mill is through the pipeline intercommunication has the sack cleaner, the outside of sack cleaner has the chimney through the pipeline intercommunication, chimney and air mixing chamber all are through the pipeline intercommunication.
The beneficial effects of the utility model are as follows:
the high-efficiency utilization device for the waste heat of the waste gas of the blast furnace water slag vertical mill system has the advantages of remarkably improving the utilization ratio of the circulating smoke of the blast furnace water slag vertical mill system, reducing the fuel consumption, effectively reducing the emission of NOX in the waste gas of the vertical mill system, and improving the energy conservation and environmental protection level of the blast furnace water slag vertical mill system.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the temperature-adjusting air distribution device comprises temperature-adjusting air valves and cyclone air mixing devices, wherein the number of the cyclone air mixing devices and the number of the temperature-adjusting air valves are several, and the cyclone air mixing devices and the temperature-adjusting air valves are symmetrically cyclone-distributed on the outer side of the air mixing chamber.
Further, the hearth comprises a hearth heat storage combustion area and a hearth diffusion combustion area, a furnace end temperature-adjusting air device is arranged in the hearth, and the hearth diffusion combustion area is communicated with the air mixing chamber.
Further, a gas control valve group is arranged at the bottom end of the burner, and a combustion-supporting fan is communicated with the tail of the gas hot-blast stove.
Further, be provided with the draught fan between sack cleaner and the chimney, be provided with a temperature sensor in the furnace, and a temperature sensor is located furnace heat accumulation burning zone and furnace diffusion burning zone intersection department.
Further, a second temperature sensor is arranged between the air mixing chamber and the air mixing barrel, a third temperature sensor is arranged between the air mixing barrel and the vertical mill, and a fourth temperature sensor is arranged between the vertical mill and the bag-type dust remover.
Further, the burner is arranged at an included angle of 80 degrees with the axial direction of the furnace body of the gas hot-blast stove, and is arranged in a tangential structure with the inner diameter of the hearth.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a view of a structure of no-recycle flue gas utilization in the prior furnace of the utility model;
FIG. 3 is a view showing a structure of a part of circulating flue gas utilization in the existing furnace according to the present utility model;
FIG. 4 is a diagram showing the main data comparison of the present utility model;
FIG. 5 is a schematic diagram of the parameters of the present utility model.
In the figure: 1. a preheating air supply adjusting device; 2. a secondary air distribution device of the hearth; 3. a furnace end temperature-regulating air device; 4. the furnace chamber three-time air distribution device; 5. a temperature-regulating air valve; 6. a rotational flow air mixing device; 7. a mixing drum; 8. a vertical mill; 9. the hearth is provided with an air distribution device for three times; 10. a secondary air distribution device of the burner; 11. a burner; 12. a gas control valve group; 13. a combustion fan; 14. a chimney; 15. an induced draft fan; 16. a bag-type dust collector; t1, a first temperature sensor; t2, a second temperature sensor; t3, a third temperature sensor; and T4, a fourth temperature sensor.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the embodiment, given by fig. 1, the utility model provides a high-efficiency utilization device for waste gas and waste heat of a blast furnace water slag vertical mill system, which comprises a gas hot-blast furnace, wherein a hearth and an air mixing chamber are arranged in the gas hot-blast furnace, a combustor 11 which extends gas to the outer side of the hot-blast furnace is arranged on the inner side of the gas hot-blast furnace, a combustor secondary air distribution device 10 is arranged on the periphery of the combustor 11 in the hearth, a preheating air supplementing and adjusting device 1 is arranged at the furnace end of the gas hot-blast furnace, a hearth secondary air distribution device 2 is arranged at the furnace end of the gas hot-blast furnace, a hearth tertiary air distribution device 4 is arranged at the tail of the gas hot-blast furnace, a temperature-adjusting air distribution device is arranged in the air mixing chamber, a hearth tertiary air distribution device 9 is arranged at the tail of the gas hot-blast furnace, an air mixing chamber 7 is communicated with an air mixing chamber, a vertical mill 8 is communicated with the outside of the air mixing chamber, a bag dust remover 16 is communicated with the outside of the vertical mill 8 through a pipeline, a chimney 14 is communicated with the outside of the bag dust remover 16 through a pipeline, the chimney 14 is communicated with the air mixing chamber 7, the air mixing chamber and the gas hot-blast furnace through a pipeline.
The hearth comprises a hearth heat accumulation combustion area and a hearth diffusion combustion area, a furnace end temperature adjusting air device 3 is arranged in the hearth, and the hearth diffusion combustion area is communicated with the air mixing chamber.
Wherein, the bottom of the burner 11 is provided with a gas control valve group 12, and the tail of the gas hot-blast stove is communicated with a combustion-supporting fan 13.
The combustion fan 13 forms an air self-preheating area when passing through the gas hot blast stove, and is guided to the burner 11 when flowing out of the gas hot blast stove.
The circulating flue gas is the gas in the gas hot-blast stove and is guided into the bag-type dust remover 16 through the vertical mill 8 by the air mixing chamber through the air mixing drum 7, and then enters the gas hot-blast stove from the new place through the chimney 14.
The natural air is conveyed to a hearth heat storage combustion area in a positive pressure mode through the combustion-supporting fan 13 to participate in the premixed combustion of fuel, meanwhile, the exhaust gas discharged by the vertical mill drying system is directly introduced into the hot blast stove in a negative pressure mode to be subjected to internal reference, combustion and temperature adjustment, and the flue gas generated by internal combustion air distribution in the stove is subjected to secondary air mixing through the air mixing barrel 7 and the circulating flue gas to reach the temperature required by the system and then enters the water slag vertical mill to provide a heat source, so that the purposes of reducing the use amount of the natural air and furthest utilizing the system exhaust gas at 85-105 ℃ are achieved.
The secondary air distribution device 10 of the burner is mainly characterized in that a secondary air buffer chamber of the burner is arranged on a mounting seat part of the burner; an electric regulating butterfly valve is arranged between the buffer chamber and the furnace shell air source, an electric actuator of the air regulating valve is an electric actuator with 4-20 ma input/output angular travel, and the action of the actuator and the frequency of the combustion air quantity are interlocked to realize automatic control; the inner side of the hearth is provided with injection pipes along the outer edge of the burner, and the injection pipes are arranged at a certain angle with the central axis of the burner; the preheated air is diverged to be injected around the flame through the buffer tank to the injection pipe.
The furnace tertiary air distribution device 9 is mainly arranged that a steel pipe is connected with positive pressure preheating air and a furnace secondary air negative pressure area, an electric adjusting butterfly valve is arranged at the middle section of the steel pipe, an air adjusting valve electric actuator is an angular travel electric actuator with switching value input, and the device introduces the preheating air of the furnace preheating section to perform oxygen content fine adjustment and temperature adjustment on circulating smoke entering the furnace.
The secondary air distribution device 2 of the hearth is mainly arranged that circulating smoke enters the hearth in a negative pressure mode through the device, the device consists of an electric regulating butterfly valve and a secondary air cyclone distribution pipe of the hearth, the electric regulating butterfly valve is used for regulating the circulating smoke amount, and an electric actuator of the valve is an electric actuator with an input-output angular stroke of 4-20 ma; the guide vanes are arranged in the secondary air cyclone distribution pipe of the hearth, are arranged in an annular shape and an included angle along the periphery of the hearth, and guide circulating smoke entering the hearth in a negative pressure mode to enter the hearth in a cyclone mode under the influence of the negative pressure, so that the impact on a flame center area is avoided.
The three-time air distribution device 4 of the hearth furnace is mainly arranged to introduce circulating smoke in a negative pressure mode, properly supplement oxygen in a combustion diffusion section and improve the burnout rate of the hearth.
The temperature-adjusting air distribution device comprises a temperature-adjusting air valve 5 and a rotational flow air mixing device 6, wherein the number of the rotational flow air mixing device 6 and the number of the temperature-adjusting air valve 5 are all a plurality of, and the rotational flow air mixing device and the temperature-adjusting air valve are symmetrically distributed on the outer side of the air mixing chamber.
The temperature-adjusting air valve 5 is an electric adjusting butterfly valve, the rotational flow air mixing device 6 is a guide plate, the temperature-adjusting air distribution device consists of the electric adjusting butterfly valve controlled by 4-20 ma input and output and the guide plate, the electric adjusting butterfly valve is symmetrically arranged in the air mixing chamber, the temperature of discharged flue gas is controlled by controlling the circulation flue gas quantity entering the air mixing chamber in a negative pressure mode, the circulation flue gas enters the air mixing chamber from two symmetrical points, and the circulation flue gas enters the air mixing chamber in a rotational flow mode along the tangent line of the cylinder through the guide plate, so that a uniform air mixing effect is realized in the air mixing chamber.
The furnace end temperature-regulating air device 3 is arranged in the annular direction of the furnace near the furnace end in the furnace hearth, is reversely arranged at a certain angle with the negative pressure direction in the furnace, introduces circulating smoke in a negative pressure mode, can sweep and cool the dead angle area of the secondary air of the furnace end subjected to high-temperature radiation, can protect the refractory material of the furnace end while improving the burnout rate, and simultaneously reduces the heat loss of the furnace end part through the heat dissipation of the shell.
An induced draft fan 15 is arranged between the bag-type dust collector 16 and the chimney 14, a first temperature sensor T1 is arranged in the hearth, and the first temperature sensor T1 is located at the intersection of a hearth heat accumulation combustion area and a hearth diffusion combustion area.
The air mixing chamber and the air mixing cylinder 7 are provided with a second temperature sensor T2, the air mixing cylinder 7 and the vertical mill 8 are provided with a third temperature sensor T3, and the vertical mill 8 and the bag-type dust collector 16 are provided with a fourth temperature sensor T4.
The temperature sensor is used for better detecting the temperature change between the two connecting units, so that the temperature change can be better known.
Wherein, the burner 11 is arranged at an included angle of 80 degrees with the axial direction of the furnace body of the gas hot-blast stove, and is arranged in a tangential structure with the inner diameter of the hearth.
The central axis of the burner 11 forms an included angle of 80 degrees with the axis of the hearth, the burner is arranged in a tangential structure with the radial direction of the hearth, under the cooperation influence of secondary air of the hearth, temperature-regulating air of the burner and secondary air for combustion supporting, the burner moves in the hearth along the radial direction and the negative pressure direction of the hearth, fuel and oxygen are uniformly combusted in the hearth in a cyclone mixing mode, the temperature of the hearth is more uniform, the burnout rate of the fuel can be effectively improved, local high temperature can be avoided, and the generation of NOX is reduced.
As shown in FIG. 2, the common process 1 is that natural air is adopted for the temperature-regulating air of a combustion fan hearth of a gas furnace, the natural normal temperature air is mixed in a gas furnace air mixing chamber for cooling to generate smoke of about 400-600 ℃, the smoke is mixed with circulating smoke of 90-110 ℃, and the smoke which is mixed to form smoke of 180-280 ℃ enters a vertical mill for providing a heat source.
As shown in FIG. 3, the common process 2 is that natural air is adopted for the temperature-regulating air of a combustion fan hearth of the gas furnace, air at about 800 ℃ is generated by combustion in the hearth, part of circulating flue gas is doped into a gas mixing chamber of the gas furnace for cooling, flue gas at about 400-600 ℃ is generated and enters a system air mixing drum, circulating flue gas at 90-110 ℃ is doped, and the flue gas at 180-280 ℃ is formed after mixing and enters a vertical mill for providing a heat source.
As the pipeline materials from the hot blast stove to the inlet section of the vertical mill are Q235B in practical application, the material can keep better strength below 350 ℃ and cannot deform. The section structure is generally provided with an inner heat insulation layer and an outer heat insulation layer. Once the temperature of the flue gas of the pipeline is higher than 550-600 ℃, the steel of the pipeline can be deformed due to weakening of strength, so that the refractory in the pipeline is damaged, the pipeline can lose strength and deform seriously for a long time, the refractory in the pipeline collapses in a large area, and meanwhile, the heat loss of the pipeline is larger due to the higher temperature. Therefore, high-temperature flue gas generated by combustion of the hearth is required to be mixed with mixed air in the air mixing chamber to be cooled to 400-500 ℃ and then enters a flue gas pipeline, and then part of circulating flue gas is mixed in the air mixing cylinder before entering the vertical mill to be cooled to the temperature required by the vertical mill process and enters the vertical mill. Therefore, the utilization rate of the circulating air of the two processes is limited, wherein in the common process 2, although part of circulating flue gas is used for cooling and mixing air in the air mixing chamber, the air mixing chamber does not participate in combustion reaction, oxidation reduction reaction and air distribution of a hearth part, the excess coefficient of ambient air is still higher, and indexes such as the burnout rate of fuel, the utilization rate of the circulating flue gas and the NOX content in the flue gas do not reach ideal effects. The environmental protection index and the economic index of the common process 1 are far lower than the ideal effect. Because of process limitation, the circulating flue gas ratio of the common process is usually 30% -75%, the arrangement defect of combustion air and temperature-regulating flue gas cannot ensure the burnout rate of fuel, and meanwhile, because a larger air coefficient is used for participating in combustion and temperature control, the oxygen content of a hearth cannot be controlled to realize low nitrogen emission, which is the current state of the process of the vertical mill gas hot blast stove of the same type of water slag matched in China.
By adopting the method in combination with the utility model shown in fig. 4, besides the traditional circulating flue gas utilization process of the blast furnace slag vertical mill production line, the circulating flue gas is introduced into the gas hot blast stove to participate in combustion, air distribution and temperature control to the maximum extent, the use of combustion air of the combustion-supporting fan 13 is reduced, and the air-fuel ratio is controlled in an adjustable manner to the minimum extent that the complete combustion of fuel is satisfied.
1. The normal temperature air with lower air coefficient is used, and the air is preheated to 60-80 ℃ by a hot blast stove preheating structure to be used as combustion-supporting primary air and a hearth secondary air distribution device.
2. The secondary air of the furnace, the temperature-regulating air of the furnace and the tertiary air of the furnace are introduced into the circulating flue gas from the chimney 14 to enter the furnace for use, so that the circulating flue gas with certain heat can be utilized more, meanwhile, the purpose of oxygen-controlled combustion is achieved because the content of the circulating flue gas is lower than that of normal-temperature air, the temperature of the furnace is more stable and uniform through multiple air distribution, and the generation of NOX is reduced while the burnout rate is improved.
3. The air mixing chamber of the hot blast stove introduces circulating smoke in a symmetrical rotational flow mode to regulate the temperature of the discharged smoke, and the temperature of the discharged smoke can be regulated to 180-280 ℃ by using the circulating smoke to directly enter a vertical mill for heat supply, or the temperature is regulated to 300-400 ℃ to enter an air mixing cylinder to mix the circulating smoke to reduce the temperature required by the process to enter the vertical mill for heat supply. The utilization ratio of the circulating smoke is increased, the smoke temperature of the smoke pipeline can be effectively reduced, and the service lives of the smoke pipeline steel and the internal refractory material can be effectively prolonged by 1.5-2 times.
4. The arrangement of the burner 11 on the hot blast stove is improved, and the burner is matched with the design of multiple air distribution, and the burner is burnt in a swirling manner in the hearth along the direction of the diagonal line of the hearth. The temperature of the hearth is more uniform, the burnout rate of fuel can be effectively improved, local high temperature can be avoided, and the generation of NOX is reduced.
Taking a slag vertical mill production line with a dry basis yield of 110 tons per table as an example:
production parameters:
the initial water content of slag is 6.7%;
the water content of the finished product after slag processing is less than 0.5 percent;
fuel/gas mixture
2033Kcal/Nm3 fuel calorific value
Fuel burn-out rate is greater than 99.6 percent
The temperature of the circulating flue gas is 90 DEG C
By combining with the result of FIG. 5, the device improves the combustion efficiency and burnout rate of fuel, remarkably improves the utilization ratio of circulating smoke of the blast furnace granulated slag vertical mill system, reduces fuel consumption, can effectively reduce the emission of NOX in the waste gas of the vertical mill system, and improves the energy-saving and environment-friendly level of the blast furnace granulated slag vertical mill system.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a high-efficient device of utilizing of blast furnace grain slag vertical mill system waste gas waste heat, includes gas hot-blast furnace, its characterized in that: the utility model discloses a gas stove, including gas stove, vertical mill, chimney, air mixing chamber, vertical mill, chimney and air mixing chamber, be provided with furnace and air mixing chamber in the gas stove, the inboard of gas stove is provided with combustor (11) that extend gas to the stove outside, in the furnace and be located combustor (11) periphery and be provided with combustor secondary air distribution device (10), gas stove furnace end department is provided with preheating wind make-up adjusting device (1), gas stove furnace end department is provided with furnace secondary air distribution device (2), gas stove furnace afterbody is provided with chamber furnace tertiary air distribution device (4), be provided with the air mixing chamber in the air mixing chamber and be provided with air conditioning air distribution device, gas stove furnace afterbody is provided with furnace tertiary air distribution device (9), air mixing chamber intercommunication has air mixing chamber (7), air mixing chamber (7) outside has vertical mill (8) through the pipeline intercommunication, the outside of vertical mill (8) has sack cleaner (16) through pipeline intercommunication, the outside of sack cleaner (16) has chimney (14) through pipeline intercommunication, chimney (14).
2. The device for efficiently utilizing waste heat of waste gas of a blast furnace slag vertical mill system according to claim 1, which is characterized in that: the temperature-adjusting air distribution device comprises a temperature-adjusting air valve (5) and a rotational flow air mixing device (6), wherein the number of the rotational flow air mixing device (6) and the number of the temperature-adjusting air valve (5) are both a plurality of, and the rotational flow air mixing devices are symmetrically distributed on the outer side of the air mixing chamber.
3. The device for efficiently utilizing waste heat of waste gas of a blast furnace slag vertical mill system according to claim 1, which is characterized in that: the hearth comprises a hearth heat accumulation combustion area and a hearth diffusion combustion area, a furnace end temperature-adjusting air device (3) is arranged in the hearth, and the hearth diffusion combustion area is communicated with the air mixing chamber.
4. The device for efficiently utilizing waste heat of waste gas of a blast furnace slag vertical mill system according to claim 1, which is characterized in that: the bottom of the burner (11) is provided with a gas control valve group (12), and the tail of the gas hot-blast stove is communicated with a combustion-supporting fan (13).
5. The device for efficiently utilizing waste heat of waste gas of a blast furnace slag vertical mill system according to claim 3, wherein the device is characterized in that: an induced draft fan (15) is arranged between the bag-type dust collector (16) and the chimney (14), a first temperature sensor (T1) is arranged in the hearth, and the first temperature sensor (T1) is located at the intersection of a heat storage combustion area of the hearth and a diffusion combustion area of the hearth.
6. The device for efficiently utilizing waste heat of waste gas of a blast furnace slag vertical mill system according to claim 1, which is characterized in that: a second temperature sensor (T2) is arranged between the air mixing chamber and the air mixing drum (7), a third temperature sensor (T3) is arranged between the air mixing drum (7) and the vertical mill (8), and a fourth temperature sensor (T4) is arranged between the vertical mill (8) and the bag-type dust remover (16).
7. The device for efficiently utilizing waste heat of waste gas of a blast furnace slag vertical mill system according to claim 1, which is characterized in that: the burner (11) is arranged at an included angle of 80 degrees with the axial direction of the gas hot-blast stove body, and is arranged in a tangential structure with the inner diameter of the hearth.
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| CN202320298620.2U CN219839740U (en) | 2023-02-23 | 2023-02-23 | High-efficient device of utilizing of blast furnace grain slag vertical mill system waste gas waste heat |
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|---|---|---|---|
| CN202320298620.2U CN219839740U (en) | 2023-02-23 | 2023-02-23 | High-efficient device of utilizing of blast furnace grain slag vertical mill system waste gas waste heat |
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