CN113088341A - Low-cost high-efficiency blast furnace gas desulfurization method - Google Patents
Low-cost high-efficiency blast furnace gas desulfurization method Download PDFInfo
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- CN113088341A CN113088341A CN202110359127.2A CN202110359127A CN113088341A CN 113088341 A CN113088341 A CN 113088341A CN 202110359127 A CN202110359127 A CN 202110359127A CN 113088341 A CN113088341 A CN 113088341A
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- Prior art keywords
- blast furnace
- coal
- powder
- desulfurizer
- gas desulfurization
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 33
- 230000023556 desulfurization Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003245 coal Substances 0.000 claims abstract description 60
- 239000000843 powder Substances 0.000 claims abstract description 32
- 239000011812 mixed powder Substances 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims description 18
- 239000000395 magnesium oxide Substances 0.000 claims description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000003009 desulfurizing effect Effects 0.000 abstract description 26
- 239000003795 chemical substances by application Substances 0.000 abstract description 24
- 239000007789 gas Substances 0.000 description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical group [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 8
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 4
- 235000019341 magnesium sulphate Nutrition 0.000 description 4
- JESHZQPNPCJVNG-UHFFFAOYSA-L magnesium;sulfite Chemical compound [Mg+2].[O-]S([O-])=O JESHZQPNPCJVNG-UHFFFAOYSA-L 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/20—Purifying combustible gases containing carbon monoxide by treating with solids; Regenerating spent purifying masses
- C10K1/30—Purifying combustible gases containing carbon monoxide by treating with solids; Regenerating spent purifying masses with moving purifying masses
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L10/00—Use of additives to fuels or fires for particular purposes
- C10L10/02—Use of additives to fuels or fires for particular purposes for reducing smoke development
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention relates to the technical field of blast furnace gas desulfurization, in particular to a low-cost high-efficiency blast furnace gas desulfurization method, and provides the low-cost high-efficiency blast furnace gas desulfurization method, which comprises the following steps: a. raw coal is conveyed to a powder preparation device through a conveying device to be ground and dried to form coal powder, b, the coal powder is conveyed to a coal injection device to be injected into a blast furnace to be combusted, a desulfurizing agent is added before the coal powder is injected into the blast furnace, the coal powder and the desulfurizing agent are mixed to form mixed powder, the mixed powder is injected into the blast furnace through the coal injection device to be combusted, or before the coal powder is combusted, the desulfurizing agent is injected into the blast furnace through another group of powder injection devices to be mixed and combusted with the desulfurizing agent, the desulfurizing agent and the coal powder are injected into the blast furnace together to be desulfurized, the use of subsequent desulfurization devices is reduced, and the desulfurization cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of blast furnace gas desulfurization, in particular to a low-cost high-efficiency blast furnace gas desulfurization method.
Background
Blast furnace gas is a byproduct generated in the blast furnace ironmaking process, is a low-calorific-value gas fuel, can be used for self-use gas of metallurgical enterprises, such as heating hot rolled steel ingots, preheating ladles and the like, and can also be supplied for civil use, the blast furnace gas contains a large amount of dust and sulfide, the emission of sulfur dioxide in the blast furnace gas which is not treated and purified exceeds the standard, and the blast furnace gas is extremely harmful to human bodies.
The existing blast furnace gas desulfurization process generally adopts wet desulfurization and dry desulfurization, and the desulfurization is carried out by discharging the blast furnace gas from a blast furnace through a plurality of devices and procedures, so that the desulfurization cost is very high.
Patent document No. 2013106553901 discloses the addition and application of a desulfurizing agent in the blast furnace ironmaking process, wherein the desulfurizing agent is added into pulverized coal before coal grinding to mix the desulfurizing agent in the pulverized coal grinding process, and the mixed powder of the desulfurizing agent and the pulverized coal is sprayed into the blast furnace through a blast furnace tuyere, so that the desulfurizing agent can desulfurize molten iron in the blast furnace, thereby reducing the blast furnace ironmaking cost and the [ S ] content in pig iron, but blast furnace gas generated in the ironmaking process still needs to be desulfurized through various desulfurizing methods after being discharged out of the blast furnace, so that the blast furnace gas desulfurization still has the problems of complicated process and high cost.
Disclosure of Invention
The invention aims to solve the problems and provides a low-cost high-efficiency blast furnace gas desulfurization method, which is used for desulfurizing blast furnace gas by spraying a desulfurizing agent into a blast furnace in a atomized state, reduces the subsequent use of blast furnace gas desulfurization procedures and equipment, and greatly reduces the desulfurization cost.
The technical scheme adopted by the invention is that a low-cost blast furnace gas desulfurization method is provided, the method is realized in a coal powder injection process, and the method comprises the following steps:
a. conveying raw coal to a powder making device through a conveying device, grinding and drying to form coal powder;
b. conveying the coal powder to coal injection equipment and injecting the coal powder into a blast furnace for combustion;
adding a desulfurizer before the pulverized coal is sprayed into the blast furnace, mixing the pulverized coal and the desulfurizer to form mixed powder, and spraying the mixed powder into the blast furnace through a coal spraying device to enable the mixed powder to be atomized and combusted in the blast furnace;
or when the pulverized coal is sprayed into the blast furnace, spraying the desulfurizing agent into the blast furnace through another group of powder spraying equipment to ensure that the desulfurizing agent enters the blast furnace in an atomized state;
the weight portion ratio of the pulverized coal to the desulfurizer is 100: 2.
The desulfurizer is crystal magnesium oxide or dead-burned magnesium oxide.
The combustion temperature in the blast furnace is 1500-1700 ℃.
The invention has the advantages that the desulfurizing agent is added before the pulverized coal is sprayed into the blast furnace, the pulverized coal and the desulfurizing agent are mixed to form mixed powder, the mixed powder is sprayed into the blast furnace through a coal spraying device for combustion, or the desulfurizing agent is sprayed into the blast furnace through another group of powder spraying devices before the pulverized coal is combusted, and the desulfurization is directly carried out in the blast furnace through the two modes, so that the desulfurization effect is better under the high-temperature environment in the blast furnace, the use of subsequent desulfurization devices is reduced, and the desulfurization cost is greatly reduced.
Detailed Description
The invention provides a low-cost blast furnace gas desulfurization method, which is realized in a coal powder injection process and comprises the following steps:
a. conveying raw coal to a powder making device through a conveying device, grinding and drying to form coal powder;
b. conveying the coal powder to coal injection equipment and injecting the coal powder into a blast furnace for combustion;
adding a desulfurizer before the pulverized coal is sprayed into the blast furnace, mixing the pulverized coal and the desulfurizer to form mixed powder, and spraying the mixed powder into the blast furnace through a coal spraying device to enable the mixed powder to be atomized and combusted in the blast furnace;
or when the pulverized coal is sprayed into the blast furnace, spraying the desulfurizing agent into the blast furnace through another group of powder spraying equipment to ensure that the desulfurizing agent enters the blast furnace in an atomized state;
the weight portion ratio of the pulverized coal to the desulfurizer is 100: 2.
Example 1 the fine desulfurization method of the present invention is specifically, a desulfurizing agent is added to pulverized coal according to a certain ratio in the process of conveying the pulverized coal to a blast furnace, the pulverized coal and the desulfurizing agent are sprayed into the blast furnace in an atomized state by a coal spraying device, after entering the blast furnace, the pulverized coal starts to burn in the air in a blast furnace cavity by means of high temperature and oxygen, and the desulfurizing agent performs a chemical reaction with sulfur in coal gas in the blast furnace in the air in the blast furnace cavity,
the desulfurizer is preferably magnesium powder, particularly crystal magnesium oxide or dead-burned magnesium oxide, the desulfurization efficiency of the magnesium powder is high, the magnesium oxide is far larger than a calcium-based desulfurizer in the aspect of chemical reaction activity, and the molecular weight of the magnesium oxide is smaller than that of calcium carbonate and calcium oxide, so that the magnesium powder stays in the air for a longer time after being blown into the blast furnace, the reaction time with sulfur dioxide generated after coal powder is combusted is fully given, and the problem of equipment scaling and blockage cannot occur to the magnesium powder.
When the coal powder is burnt, sulfur and oxygen in the coal powder react to generate sulfur dioxide, the chemical formula is 'S + O2-SO 2', the sulfur dioxide reacts with magnesium powder to generate magnesium sulfite, the chemical formula is 'SO 2+ MgO-MgSO 3', the magnesium sulfite reacts with oxygen to generate magnesium sulfate, the chemical formula is '2 MgSO3+ O2-2 MgSO 4', the magnesium sulfate is discharged out of the blast furnace along with slag after being generated, SO that the contents of the sulfur dioxide and the hydrogen sulfide in the blast furnace gas are greatly reduced, equipment and processes for secondary desulfurization are reduced when the blast furnace gas is discharged, the desulfurization cost is greatly reduced, part of desulfurizing agent can also fall into the molten iron to react with the sulfur in the molten iron, and further the molten iron is desulfurized, the sulfur content of the molten iron is reduced, the temperature in the blast furnace is 1500-1700 ℃, and the desulfurization efficiency and the desulfurization effect are greatly improved in a high-temperature environment.
Embodiment 2 is different from embodiment 1 in that a desulfurizing agent is separately sprayed into a blast furnace in an atomized state through a powder spraying device according to a certain proportion, the desulfurizing agent is preferably magnesium powder, specifically, crystalline magnesium oxide or dead-burned magnesium oxide, the coal powder and the magnesium powder enter the blast furnace in a spraying mode respectively, advanced mixing is not needed, the magnesium powder directly performs a chemical reaction with sulfur in blast furnace gas in the blast furnace to generate magnesium sulfite, the magnesium sulfite reacts with oxygen to generate magnesium sulfate, and the generated magnesium sulfate is discharged out of the blast furnace along with slag.
Claims (3)
1. A low-cost high-efficiency blast furnace gas desulfurization method is realized in a coal powder injection process, and comprises the following steps:
a. conveying raw coal to a powder making device through a conveying device, grinding and drying to form coal powder;
b. conveying the coal powder to coal injection equipment and injecting the coal powder into a blast furnace for combustion;
the method is characterized in that a desulfurizer is added before pulverized coal is sprayed into the blast furnace, the pulverized coal and the desulfurizer are mixed to form mixed powder, and the mixed powder is sprayed into the blast furnace through a coal spraying device to enable the mixed powder to be burnt in the blast furnace in an atomized state;
or when the pulverized coal is sprayed into the blast furnace, spraying the desulfurizer into the blast furnace through another group of powder spraying equipment to enable the desulfurizer to enter the blast furnace in an atomized state, wherein the spraying height of the desulfurizer is higher than that of the pulverized coal;
the weight portion ratio of the pulverized coal to the desulfurizer is 100: 2.
2. The low-cost high-efficiency blast furnace gas desulfurization method according to claim 1, characterized in that: the desulfurizer is crystal magnesium oxide or dead-burned magnesium oxide.
3. The low-cost high-efficiency blast furnace gas desulfurization method according to claim 1, characterized in that: the combustion temperature in the blast furnace is 1500-1700 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110359127.2A CN113088341A (en) | 2021-04-02 | 2021-04-02 | Low-cost high-efficiency blast furnace gas desulfurization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110359127.2A CN113088341A (en) | 2021-04-02 | 2021-04-02 | Low-cost high-efficiency blast furnace gas desulfurization method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113088341A true CN113088341A (en) | 2021-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110359127.2A Pending CN113088341A (en) | 2021-04-02 | 2021-04-02 | Low-cost high-efficiency blast furnace gas desulfurization method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113088341A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060009A (en) * | 2013-12-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Adding method of desulfurizer in blast furnace ironmaking process and application |
| CN112094969A (en) * | 2019-06-18 | 2020-12-18 | 美匡冶金技术研究院(苏州)有限公司 | Sintering method for reducing solid fuel consumption ratio |
-
2021
- 2021-04-02 CN CN202110359127.2A patent/CN113088341A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060009A (en) * | 2013-12-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Adding method of desulfurizer in blast furnace ironmaking process and application |
| CN112094969A (en) * | 2019-06-18 | 2020-12-18 | 美匡冶金技术研究院(苏州)有限公司 | Sintering method for reducing solid fuel consumption ratio |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210709 |
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| RJ01 | Rejection of invention patent application after publication |