CN115820963A - Oxygen-enriched burning system of hot blast stove and parallel control method - Google Patents
Oxygen-enriched burning system of hot blast stove and parallel control method Download PDFInfo
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- CN115820963A CN115820963A CN202310150120.9A CN202310150120A CN115820963A CN 115820963 A CN115820963 A CN 115820963A CN 202310150120 A CN202310150120 A CN 202310150120A CN 115820963 A CN115820963 A CN 115820963A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 161
- 239000001301 oxygen Substances 0.000 title claims abstract description 161
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 149
- 239000007789 gas Substances 0.000 claims description 35
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 230000001276 controlling effect Effects 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 claims description 7
- 238000010926 purge Methods 0.000 claims description 3
- 238000005338 heat storage Methods 0.000 abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention belongs to the field of hot blast stoves, and particularly relates to an oxygen-enriched burning system of a hot blast stove and a parallel control method, which can improve the work heat storage efficiency of the hot blast stove, reduce the stove change frequency of the hot blast stove, and optimize the metallurgical conditions of a blast furnace. The technical scheme comprises at least two hot blast stoves. Wherein at least one of the at least two hot blast stoves is configured as a combustion furnace, while at least one of the at least two hot blast stoves is configured as a blast stove. The cold air inlets and the cold air pipes of the at least two hot blast stoves are communicated with the after-machine oxygen enrichment system; and the air inlets of the combustion chambers of the at least two hot blast stoves and the combustion-supporting air pipeline are communicated with the after-machine oxygen enrichment system, and the after-machine oxygen enrichment system is configured to provide oxygen-enriched amount for the combustion furnace.
Description
Technical Field
The invention belongs to the field of hot blast stoves, in particular to an oxygen-enriched burning system of a hot blast stove and a parallel control method.
Background
Blast furnaces are one of the common smelting devices in the field of metallurgy. Typically, a blast furnace is equipped with 3 or 4 stoves, with one stove being used for blast air and the other stoves burning for heat storage, and so on in alternation.
In the current technology, hot blast stoves use low heating value gas to heat the gas entering the blast furnace by combustion to release heat. For example, a common low-calorific-value gas used in hot blast stoves is blast furnace gas, which is mixed with combustion air at a certain air-fuel ratio and then combusted in a combustion chamber of the hot blast stove to generate heat.
However, the combustion temperature of the low-calorific-value gas is low, the heat storage efficiency of the hot blast stove is low, so that the temperature of the hot blast stove for air supply is reduced quickly, and other hot blast stoves for combustion and heat storage need to be replaced into the air supply stove in time to ensure that the temperature of the gas entering the blast furnace is sufficient.
The high-frequency furnace replacement of the hot blast furnace has the defects of troublesome operation, and the fluctuation of gas pressure entering the blast furnace is not beneficial to production.
Disclosure of Invention
In order to overcome the defects in the related technology, the invention provides the oxygen-enriched burning system of the hot blast stove and the parallel control method, which can improve the work heat storage efficiency of the hot blast stove, reduce the stove changing frequency of the hot blast stove and optimize the metallurgical conditions of the blast furnace.
In order to achieve the technical purpose, on the one hand, the invention provides an oxygen-enriched burning system of a hot blast stove. The oxygen-enriched burning system of the hot blast stove comprises at least two hot blast stoves. Wherein at least one of the at least two hot blast stoves is configured as a combustion furnace, while at least one of the at least two hot blast stoves is configured as a blast furnace. The cold air inlets and the cold air pipes of the at least two hot blast stoves are communicated with the after-machine oxygen enrichment system; and air inlets and combustion-supporting air pipelines of the combustion chambers of the at least two hot blast stoves are communicated with the after-machine oxygen enrichment system, and the after-machine oxygen enrichment system is configured to provide oxygen enrichment for the combustion furnace.
Preferably, the post-aircraft oxygen enrichment system comprises an oxygen supply conduit configured to deliver oxygen, the oxygen supply conduit supplying air to a cold air inlet of the blast furnace. The air inlets of the combustion chambers of the at least two stoves are also in communication with the oxygen supply conduit, which is also configured to provide oxygen to the furnace.
Preferably, the oxygen supply pipeline is communicated with the combustion-supporting air pipeline, and a pressure reducing valve, a shut-off valve and an adjusting valve are sequentially arranged on a pipeline between the oxygen supply pipeline and the combustion-supporting air pipeline along the air flow direction.
Preferably, the post-machine oxygen enrichment system further comprises a nitrogen gas supply pipeline, the nitrogen gas supply pipeline is respectively communicated with the cold air inlet of the hot blast stove and the combustion air pipeline, and the nitrogen gas supply pipeline is configured to provide nitrogen gas for the hot blast stove and the combustion air pipeline for purging.
On the other hand, the invention provides a cross parallel air supply control method of an oxygen-enriched burning system of a hot blast stove, which is suitable for the oxygen-enriched burning system of the hot blast stove in any embodiment. The parallel control method comprises the following steps: injecting blast furnace gas into a combustion chamber of the combustion furnace, wherein the oxygen content of the blast furnace gas is 0.8-1.5%, enriching oxygen for combustion-supporting air in a combustion-supporting air pipeline communicated with the combustion furnace by 1-2.5%, injecting the combustion-supporting air after oxygen enrichment into the combustion chamber of the combustion furnace, and the volume ratio of the blast furnace gas to the combustion-supporting air after oxygen enrichment is 1.25-1.43. And controlling the combustion heat accumulation of the combustion furnace, and stopping the combustion heat accumulation of the combustion furnace when the vault temperature of the combustion furnace reaches 1350-1380 ℃. The combustion furnace and the air supply furnace are controlled to be replaced, combustion-supporting air in a combustion-supporting air pipeline communicated with the combustion furnace after the furnace is replaced is enriched with oxygen by 1% -2.5%, the vault temperature of the combustion furnace after the furnace is replaced is controlled to 1350-1380 ℃, the air supply furnace after the furnace is replaced supplies air to a communicated cold air pipe and an after-machine oxygen enrichment system until the vault temperature of the air supply furnace after the furnace is replaced is larger than or equal to 1000 ℃.
Preferably, the vault temperature of the air supply furnace is greater than or equal to 1000 ℃, and the combustion furnace stops combustion and heat accumulation when the vault temperature of the combustion furnace reaches 1350-1380 ℃. One hot blast stove of the at least two hot blast stoves is alternately configured as a blast stove and a combustion furnace a plurality of times.
Preferably, the amount of oxygen enriched at the cold air inlet when the hot blast stove is configured as a combustion furnace is a part of the amount of oxygen enriched at the cold air inlet when the hot blast stove is configured as an air blast furnace, and the usage amount is 1000-1500 m 3 /h。
Preferably, the oxygen-enriched combustion-supporting air is preheated before entering the combustion furnace, and the temperature of the preheated combustion-supporting air is 180-200 ℃.
Preferably, the method for enriching oxygen by 1% -2.5% in the combustion air pipeline communicated with the combustion furnace comprises the following steps: opening the pressure reducing valve, controlling the air pressure in a combustion-supporting air pipeline between the pressure reducing valve and the stop valve to be 50kpa, and controlling the pipe diameter ratio to be 1:4.2; . And sequentially opening the stop valve and the regulating valve, controlling the air inlet speed of the regulating valve according to the oxygen content of the combustion-supporting air, and modulating the combustion-supporting air by the oxygen enrichment rate of less than or equal to 2.5%.
Compared with the prior art, the invention has the following beneficial effects:
generally, the blast furnace is provided with an oxygen enrichment system because the blast furnace inlet gas needs to be enriched with oxygen. The combustion-supporting air pipeline can be directly communicated with the oxygen enrichment system to realize oxygen enrichment combustion of blast furnace gas, so that the combustion efficiency and the combustion temperature of the blast furnace gas are improved, the heat storage temperature in the hot blast furnace can be improved, the furnace changing time of the hot blast furnace is prolonged, and the air inlet fluctuation of the blast furnace is reduced.
The oxygen-enriched combustion can fully combust the blast furnace gas, reduce the emission and has the functions of saving energy and protecting the environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings used in the description of the embodiments or the related art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a block diagram provided by some related art in the present invention;
FIG. 2 is a block diagram provided in accordance with some embodiments of the present invention;
FIG. 3 is another block diagram provided in accordance with some embodiments of the present invention;
FIG. 4 is a diagram of steps of a parallel control method provided in some embodiments of the invention;
fig. 5 is a diagram of a step of enriching oxygen in the combustion air in a combustion air duct communicating with the combustion furnace, provided by some embodiments of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first" and "second" are used for descriptive purposes only, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In some related technologies, as shown in fig. 1, the normal operation of the blast furnace requires the cooperation of a blast furnace blower system, the blast furnace blower system is composed of a blower 1, a hot blast stove 2, a cold air pipe 3, a hot blast pipe 4 and the like, the blower 1 enters the hot blast stove 2 through the cold air pipe 3 for preheating, and then is sent to the blast furnace through the hot blast pipe 4 for sealing and enters the blast furnace 5.
To increase the temperature and thermal efficiency in the blast furnace 5, the gas in the cold air duct 3 needs to be enriched with oxygen, so the blast furnace blower system also comprises an oxygen enrichment system, which may be, for example, a post-blower oxygen enrichment system 6. The post-aircraft oxygen enrichment system 6 may comprise: an oxygen compressor 61, an oxygen pressure regulating valve 62, an oxygen distributing valve 63 and an oxygen supply pipe 64. Specifically, the oxygen compressor 61 may be in communication with an oxygen supply conduit 64, the oxygen supply conduit 64 being configured to deliver oxygen to the oxygen compressor 61, the oxygen compressor 61 in turn being in communication with an oxygen pressure regulating valve 62, an oxygen distribution valve 63, and a cold air inlet of the hot blast stove 2, e.g., the oxygen distribution valve 63 may be in communication with the cold air inlet of the hot blast stove 2 through the cold air duct 3 to achieve oxygen enrichment of the gas in the cold air duct 3.
The blast furnace blower system further comprises a combustion fan 21, the combustion fan 21 is communicated with the hot blast stove 2 through a combustion air pipeline 22, the combustion fan 21 provides combustion air for the combustion chamber of the hot blast stove 2, and the combustion air can be air, for example.
In order to further improve the working efficiency of the hot blast stove and reduce the air pressure fluctuation in a blast furnace blast system caused by the frequency of changing the hot blast stove, the invention provides an oxygen-enriched burning system of the hot blast stove. As shown in fig. 2, the oxygen-enriched burning system of the hot blast stove of the present invention includes a blower 1, a hot blast stove 2, a cold air pipe 3, a hot air pipe 4 and a combustion fan 21, and the arrangement position and the connection mode thereof are the same as those of the embodiment shown in fig. 1, and are not described herein again. Besides, the oxygen-enriched burning system of the hot blast stove of the embodiment comprises at least two hot blast stoves 2. Wherein at least one stove 2 of the at least two stoves 2 is configured as a combustion furnace, while at least one stove 2 of the at least two stoves 2 is configured as a blast furnace. The cold air inlets of the at least two hot blast stoves 2 and the cold air pipe 3 are communicated with the post-machine oxygen enrichment system 6. The air inlets of the combustion chambers of the at least two hot blast stoves 2, the combustion air duct 22 are both in communication with the after-machine oxygen enrichment system 6, the after-machine oxygen enrichment system 6 being configured to provide oxygen to the combustion furnace.
Illustratively, the stove oxygen-rich burner system may comprise 2, 3 or 4 stoves 2, for example 3 stoves 2, two of the 3 stoves 2 being burners and another of the 3 stoves 2 being a blast furnace.
It will be appreciated that any of the 3 stoves 2 may alternatively be configured as a combustion or blast furnace, and therefore the air inlet of the combustion chamber of each stove 2 is in communication with the combustion air duct 22 and the after-machine oxygen enrichment system 6, to achieve oxygen enrichment of the combustion air when the stove 2 is configured as a combustion furnace.
By enriching the combustion air with oxygen, the combustion efficiency of the low-heat value gas entering the hot blast stove 2 can be improved, the combustion temperature of the low-heat value gas in the hot blast stove 2 is improved, and the heat storage temperature of the combustion furnace is higher. So, burning furnace and changing the stove for the air supply stove, can improve the gas temperature who gets into in the hot-blast main 4, can prolong hot-blast furnace 2 as the time of air supply stove, can reduce hot-blast furnace 2 and change the stove frequency, reduce blast furnace blower system's gas fluctuation then.
In some embodiments, as shown in FIG. 3, the post-aircraft oxygen enrichment system includes an oxygen supply conduit 64, the oxygen supply conduit 64 configured to deliver oxygen, the oxygen supply conduit 64 supplying air to the cold air inlet of the air blast stove. The air inlets of the combustion chambers of the at least two stoves 2 are also in communication with an oxygen supply conduit 64, the oxygen supply conduit 64 being in communication further configured to provide oxygen to the furnace.
Illustratively, the air pressure inside the oxygen supply duct 64 may suffice for feeding air to the combustion chamber of the stove 2, and thus does not need to be communicated with the air inlet of the combustion chamber of the stove 2 via the oxygen compressor 61. Meanwhile, the existing post-machine oxygen enrichment system 6 in the existing equipment is utilized to enrich oxygen in the gas entering the combustion chamber of the hot blast stove 2, the equipment cost can be reduced, and the equipment complexity is reduced.
In some embodiments, the post-aircraft oxygen enrichment system 6 comprises: the oxygen supply conduit 64 communicates with the combustion air conduit 22, a pressure reducing valve 23, a shut-off valve 24 and an adjusting valve 25 are provided in this order in the direction of air flow on the line between the oxygen supply line 64 and the combustion air line 22.
Illustratively, each stove 2 provides combustion air to its combustion chamber via a combustion air duct 22, such as air. The oxygen enrichment is carried out on the gas entering the combustion chamber of the hot blast stove 2, and the post-machine oxygen enrichment system 6 can be communicated with the combustion-supporting air pipeline 22 to carry out the oxygen enrichment on the combustion-supporting gas entering the combustion chamber of the hot blast stove 2. For example, there may be 3 stoves 2, the air inlet of the combustion chamber of each stove 2 communicating with one combustion air duct 22, each combustion air duct 22 communicating with an oxygen supply duct 64.
To ensure that the oxygen entering the combustion air duct 22 is smooth and does not impinge on the combustion air duct 22, a pressure reducing valve may be provided in the line between the oxygen supply duct 64 and the combustion air duct 22. In order to adjust the amount of oxygen entering the combustion air duct 22 according to the oxygen content of the combustion air in the combustion air duct 22, a regulating valve 25 is required to control the oxygen entry amount. Meanwhile, for safety and oxygen control, a shut-off valve 24 is provided in a line between the oxygen supply line 64 and the combustion air line 22 between the pressure reducing valve 23 and the regulating valve 25 to cut off the oxygen output in time in case of a failure, thereby ensuring safety.
In some embodiments, the post-machine oxygen enrichment system 6 further comprises a nitrogen supply conduit 65, the nitrogen supply conduit 65 being in communication with the cold air inlet of the stove 2 and the combustion air conduit 22, respectively, the nitrogen supply conduit 65 being configured to provide nitrogen to the stove 2 and the combustion air conduit 22 for purging.
It will be appreciated that there may be periods when the blast furnace is out of service, for example during maintenance or when it is out of order. When the blast furnace starts to operate, nitrogen is adopted to blow and sweep the corresponding pipeline so as to remove surface dirt and improve the metal smelting quality.
In a similar way, the hot blast stove also has a period of long-term shutdown, and when the hot blast stove 2 works again, nitrogen is adopted to sweep corresponding pipelines, so that the inside of the combustion chamber is prevented from being polluted by dirt.
Therefore, a shut-off valve is provided in a pipe connecting the nitrogen gas supply line 65 and the combustion air line 22.
On the other hand, the invention provides a cross parallel air supply control method of an oxygen-enriched burning system of a hot blast stove, the oxygen-enriched burning system of the hot blast stove is suitable for any embodiment.
In some embodiments of the present invention, as shown in fig. 4, the parallel control method includes the steps of:
s1, injecting blast furnace gas into a combustion chamber of a combustion furnace, wherein the oxygen content of the blast furnace gas is 0.8-1.5%, enriching oxygen for combustion-supporting air in a combustion-supporting air pipeline communicated with the combustion furnace by 1-2.5%, injecting the combustion-supporting air after oxygen enrichment into the combustion chamber of the combustion furnace, and the volume ratio of the blast furnace gas to the combustion-supporting air after oxygen enrichment is 1.25-1.43.
And S2, controlling the combustion of the combustion furnace to accumulate heat, and stopping combustion of the combustion furnace to accumulate heat when the temperature of the vault of the combustion furnace reaches 1350-1380 ℃.
And S3, controlling the combustion furnace and the air supply furnace to be replaced, enriching oxygen in the combustion-supporting air in a combustion-supporting air pipeline communicated with the combustion furnace after the furnace is replaced by 1-2.5%, controlling the vault temperature of the combustion furnace after the furnace is replaced to 1350-1380 ℃, and supplying air to an air cooling pipe and an after-machine oxygen enrichment system communicated with the air supply furnace after the furnace is replaced until the vault temperature of the air supply furnace after the furnace is replaced is greater than or equal to 1000 ℃.
Illustratively, a hot blast stove configured as a burner is fueled by blast furnace gas, which heats up heat stored inside while heating cool air entering inside through a cool air duct. The blast furnace gas has an oxygen content of 0.8% to 1.5%, for example, the blast furnace gas may have an oxygen content of 0.8%, 1.0% or 1.5%. The combustion-supporting air can be air, the oxygen content is about 21%, at the moment, the combustion temperature of blast furnace gas is low, the heat storage time of the combustion furnace is long, and the temperature of part of cold air entering the combustion furnace after being heated is relatively low.
The combustion-supporting air reacting with the blast furnace gas is enriched with oxygen by 1% -2.5%, for example, the combustion-supporting air is enriched with oxygen by 1%, 2.0% or 2.5%. Namely, the oxygen content of the combustion-supporting air after oxygen enrichment can be 22-23.5%, the combustion temperature can be improved by 15-30 ℃ after the combustion-supporting air after oxygen enrichment and the blast furnace gas are combusted, namely the temperature of heated cold air can be improved by 15-30 ℃, the smelting efficiency and the internal temperature of the blast furnace can be improved, and the method has the advantage of reducing energy consumption. In addition, the heat storage temperature in the combustion furnace can be improved, and when the combustion furnace is changed into the air supply furnace, the time for configuring the hot blast stove into the air supply furnace can be prolonged, namely, the furnace changing frequency of the combustion furnace and the air supply furnace can be reduced, the air pressure fluctuation in a blast furnace blast system can be reduced, the smelting temperature of the blast furnace can be stabilized, and the smelting quality can be improved.
In some embodiments, the dome temperature of the blast furnace is greater than or equal to 1000 c, and when the temperature of the vault of the combustion furnace reaches 1350-1380 ℃, the combustion furnace stops combustion and heat accumulation. One hot blast stove of the at least two hot blast stoves is alternately configured as a blast stove and a combustion stove a plurality of times.
For example, each blast furnace may be configured with 2 to 4 hot blast stoves, and a plurality of hot blast stoves may be alternately configured as an air supply stove and a combustion furnace, for example, at least two hot blast stoves may be 3 hot blast stoves, wherein two of the 3 hot blast stoves are configured as combustion furnaces, one of the 3 hot blast stoves is configured as an air supply stove, and after a period of time, one of the two hot blast stoves is changed into an air supply stove, and the air supply stove is changed into an air supply stove, and so on, alternately. Wherein, the hot-blast furnace trades the stove for the air feed stove, and the condition that the air feed stove trades the stove for burning furnace simultaneously is: the vault temperature of the air supply furnace is greater than or equal to 1000 ℃, and the vault temperature of the combustion furnace is 1350-1380 ℃.
In some embodiments, the amount of oxygen enrichment of the cold air inlet when the stove is configured as a furnace is a fraction of the amount of oxygen enrichment of the cold air inlet when the stove is configured as a blast furnace.
Illustratively, the invention adopts a parallel air supply mode, namely, air is input into a hot air pipe by a combustion furnace and an air supply furnace, wherein the air input of a cold air inlet of the combustion furnace is 1000-1500 m 3 /h。
In some embodiments, the oxygen-enriched combustion-supporting air is preheated before entering the combustion furnace, and the temperature of the preheated oxygen-enriched combustion-supporting air is 180-200 ℃.
In some embodiments, as shown in figure 5, the method for enriching oxygen for 1-2.5% of combustion-supporting air in a combustion-supporting air pipeline communicated with a combustion furnace comprises the following steps:
s11, opening a pressure reducing valve, controlling the air pressure in a combustion-supporting air pipeline between the pressure reducing valve and a cut-off valve to be 50kpa, and controlling the pipe diameter ratio to be 1:4.2.
s12, opening the stop valve and the regulating valve in sequence, controlling the air inlet speed of the regulating valve according to the oxygen content of the combustion-supporting air, and modulating the combustion-supporting air by the oxygen enrichment rate of less than or equal to 2.5%.
In the description of the present specification, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The oxygen boosting burning furnace system of the hot blast stove is characterized by comprising:
at least two hot blast stoves, at least one of the at least two hot blast stoves being configured as a combustion furnace, while at least one of the at least two hot blast stoves is configured as a blast furnace;
the cold air inlets and the cold air pipes of the at least two hot blast stoves are communicated with the after-machine oxygen enrichment system;
and air inlets and combustion-supporting air pipelines of the combustion chambers of the at least two hot blast stoves are communicated with the after-machine oxygen enrichment system, and the after-machine oxygen enrichment system is configured to provide oxygen enrichment for the combustion furnace.
2. The stove oxygen-enriched combustion system of claim 1, wherein the post-machine oxygen-enrichment system comprises an oxygen supply conduit configured to deliver oxygen, the oxygen supply conduit supplying air to a cold air inlet of the stove;
the air inlets of the combustion chambers of the at least two stoves are also in communication with the oxygen supply conduit, which is also configured to provide oxygen to the furnace.
3. The oxygen-enriched burning system of the hot blast stove according to claim 2, wherein the oxygen supply pipeline is communicated with the combustion air pipeline, and a pressure reducing valve, a shut-off valve and an adjusting valve are sequentially arranged on a pipeline between the oxygen supply pipeline and the combustion air pipeline along the air flow direction.
4. The stove oxygen-enriched burner system of claim 3, further comprising a nitrogen gas supply conduit in communication with the stove cold air inlet and the combustion air conduit, respectively, the nitrogen gas supply conduit configured to provide nitrogen gas to the stove and combustion air conduit for purging.
5. The parallel control method of the oxygen-enriched burning system of the hot blast stove is suitable for the oxygen-enriched burning system of the hot blast stove in any one of claims 1 to 4, and comprises at least two hot blast stoves, wherein at least one of the at least two hot blast stoves is configured as a combustion furnace, and at least one of the at least two hot blast stoves is configured as an air supply furnace;
the parallel control method is characterized by comprising the following steps:
injecting blast furnace gas into a combustion chamber of the combustion furnace, wherein the oxygen content of the blast furnace gas is 0.8-1.5%, enriching oxygen for combustion-supporting air in a combustion-supporting air pipeline communicated with the combustion furnace by 1-2.5%, injecting the oxygen-enriched combustion-supporting air into the combustion chamber of the combustion furnace, and the volume ratio of the blast furnace gas to the oxygen-enriched combustion-supporting air is 1.25-1.43;
controlling the combustion heat accumulation of the combustion furnace, and stopping the combustion heat accumulation of the combustion furnace when the vault temperature of the combustion furnace reaches 1350-1380 ℃;
the combustion furnace and the air supply furnace are controlled to be replaced, combustion-supporting air in a combustion-supporting air pipeline communicated with the combustion furnace after the furnace is replaced is enriched with oxygen by 1% -2.5%, the vault temperature of the combustion furnace after the furnace is replaced is controlled to 1350-1380 ℃, the air supply furnace after the furnace is replaced supplies air to a communicated cold air pipe and an after-machine oxygen enrichment system until the vault temperature of the air supply furnace after the furnace is replaced is larger than or equal to 1000 ℃.
6. The parallel control method of the oxygen-enriched burning system of the hot blast stove according to claim 5,
the vault temperature of the air supply furnace is greater than or equal to 1000 ℃, and when the vault temperature of the combustion furnace reaches 1350-1380 ℃, the combustion furnace stops combustion and heat accumulation;
one of the at least two hot blast stoves is alternately configured as a blast stove and a combustion furnace a plurality of times.
7. The parallel control method for an oxygen-rich burn system in a hot blast stove according to claim 5, wherein the amount of oxygen enrichment of the cold air inlet when the hot blast stove is configured as a burner is less than the amount of oxygen enrichment of the cold air inlet when the hot blast stove is configured as a blast furnace.
8. The parallel control method for the oxygen-enriched combustion furnace system of the hot-blast stove according to claim 5, wherein the pre-heated combustion-supporting air is preheated before entering the combustion furnace, and the temperature of the pre-heated combustion-supporting air is 180 ℃ to 200 ℃.
9. The parallel control method of the oxygen-enriched burning system of the hot blast stove according to claim 5 or 6, characterized in that the post-machine oxygen-enriched system comprises an oxygen supply pipeline, the oxygen supply pipeline is communicated with the combustion-supporting air pipeline, and a pressure reducing valve, a shut-off valve and an adjusting valve are sequentially arranged on a pipeline between the oxygen supply pipeline and the combustion-supporting air pipeline along the air flow direction;
the method for enriching oxygen in the combustion-supporting air pipeline communicated with the combustion furnace by 1-2.5% comprises the following steps:
opening the pressure reducing valve, controlling the air pressure in a combustion-supporting air pipeline between the pressure reducing valve and the stop valve to be 50kpa, and controlling the pipe diameter ratio to be 1:4.2;
and sequentially opening the stop valve and the regulating valve, controlling the air inlet speed of the regulating valve according to the oxygen content of the combustion-supporting air, and modulating the combustion-supporting air by the oxygen enrichment rate of less than or equal to 2.5%.
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| CN (1) | CN115820963A (en) |
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