CN112557238A - Method for detecting thermal reaction strength of smokeless lump coal - Google Patents
Method for detecting thermal reaction strength of smokeless lump coal Download PDFInfo
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- CN112557238A CN112557238A CN202011526477.5A CN202011526477A CN112557238A CN 112557238 A CN112557238 A CN 112557238A CN 202011526477 A CN202011526477 A CN 202011526477A CN 112557238 A CN112557238 A CN 112557238A
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- coke
- gas
- smokeless
- lump coal
- thermal reaction
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- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000571 coke Substances 0.000 claims abstract description 46
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000003830 anthracite Substances 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims description 33
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 14
- 239000001569 carbon dioxide Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- 239000010431 corundum Substances 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 239000004484 Briquette Substances 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 5
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000003638 chemical reducing agent Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000604 Ferrochrome Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000011895 specific detection Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a method for detecting the thermal reaction strength of anthracite briquettes, belongs to the technical field of metallurgy, and aims to provide a method for detecting the thermal reaction strength of the anthracite briquettes when the anthracite briquettes replace part of coke to perform high-temperature smelting. By the method, when the smokeless lump coal iron is used for replacing part of coke to carry out high-temperature smelting, the quality detection parameters of the smokeless lump coal are increased, and the stable and smooth operation of the furnace condition is further ensured.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for detecting the thermal reaction strength of smokeless lump coal when the smokeless lump coal replaces part of coke for high-temperature smelting (such as blast furnace smelting and ferroalloy smelting).
Background
The carbon reducing agent accounts for over half of the production cost of the blast furnace or the ferroalloy, and if other products can be used for replacing part or all of coke, the cost of the iron and steel enterprises can be greatly reduced. For a long time, cheaper coke substitutes have been actively sought both at home and abroad. The anthracite has high fixed carbon content, low sulfur, high yield and economic price, and has great potential for replacing coke in blast furnaces or ferroalloy smelting.
Currently, smokeless lump coal is used for coal chemical industry for more research, coal quality indexes are mostly suitable for guiding coal chemical industry enterprises to produce, and the smokeless lump coal serving as a reducing agent enters a blast furnace or ferroalloy industry and is not researched in a large quantity; besides the commonly used coal quality index, the parameter index suitable for the smokeless lump coal to replace part of coke for blast furnace or ferroalloy smelting needs to be proposed and detected.
The coke plays an important role in blast furnace smelting and is a heat source, a reducing agent and a material column framework in the blast furnace. The coke is used as a skeleton to ensure the air permeability and liquid permeability in the furnace. Therefore, great attention is paid to reactivity and post-reaction strength of the blast furnace coke. The properties of ferroalloy production for detecting carbonaceous reducing agents include chemical composition, specific resistance, graphitization, reactivity, particle size and strength. A series of physical and chemical reactions are carried out in the submerged arc furnace, and the carbonaceous reducing agent not only influences the reduction reaction of furnace materials, but also influences the current distribution and the electrode position in the furnace, further influences the temperature distribution of a hearth and the air permeability of the furnace materials, and can cause accidents such as material collapse and explosion in severe cases.
The strength of anthracite coal is generally referred to as mechanical strength, and most commonly used is a drum test method, and the other is to measure the "shatter index" when falling freely at a certain height. However, when the anthracite coal is used in a blast furnace or a submerged arc furnace instead of a part of coke, not only the mechanical strength but also the thermal reaction strength needs to be measured.
The reference finds that ferroalloy enterprises carry out industrial tests of replacing coke with coal, wherein the industrial tests comprise semi-coke, bituminous coal, anthracite and composite carbon, the process and the result of the industrial tests are described in detail, and the quality detection and index requirements on the carbonaceous reducing agent are not provided. Indexes such as components, calorific value, drum strength and the like are compared in a blast furnace lump coal blending experiment. CN101392348A discloses a method for producing high-carbon ferrochrome by using part of coke of small-particle anthracite, and provides the mass ratio of the anthracite and the coke, the component requirements and the granularity requirements of the anthracite.
The above documents and patents do not propose a method for detecting the strength of smokeless lump coal that is suitable for the smelting characteristics of blast furnaces or ferroalloys. A method for detecting the thermal reaction strength of the smokeless lump coal is designed according to the carbon thermal reaction in a furnace and the composition of raw materials.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for detecting the thermal reaction intensity of smokeless lump coal according to the carbon thermal reaction in a furnace and the composition of raw materials, which is used for detecting the thermal reaction intensity of the smokeless lump coal when the smokeless lump coal replaces part of coke to carry out high-temperature smelting (such as blast furnace smelting and ferroalloy smelting).
The invention adopts the following technical scheme:
a method for detecting the thermal reaction strength of anthracite blocks comprises the following steps:
firstly, filling coke and smokeless lump coal into a corundum crucible with a plurality of holes at the bottom;
secondly, placing the corundum crucible in a high-temperature reactor, connecting a gas path pipeline, starting to heat after checking, wherein the heating rate is 10 ℃/min, heating to 400 ℃, introducing nitrogen for protection, heating to 1100 ℃, keeping the constant temperature, blowing in carbon dioxide gas or mixed gas of the carbon dioxide gas and the carbon monoxide gas, continuing for 2 hours, changing the gas into nitrogen after 2 hours, and stopping heating;
and thirdly, taking out the sample cooled to the room temperature, separating and weighing the coke and the anthracite briquettes, putting the sample into an I-shaped rotary drum after weighing, rotating for 30 min at the rotating speed of 20 r/min, and then screening by using a round hole screen with the diameter of 10 mm, wherein the coke and the anthracite briquettes on the round hole screen respectively account for the percentage of the total amount of the sample after reaction and are the reaction strength of the coke and the anthracite briquettes.
In the first step, the mass ratio of the coke to the smokeless coal briquette is 1: 1.
The particle size of the coke and the smokeless coal blocks in the first step is 20-25 mm.
In the second step, the nitrogen protection nitrogen gas is introduced at a rate of 0.8L/min, the carbon dioxide gas is introduced at a rate of 5L/min or a mixed gas of 0.5L/min carbon dioxide gas and 3.5L/min carbon monoxide gas, and the nitrogen gas introduction rate after 2 hours is 0.8L/min.
The invention has the following beneficial effects:
1. by the method, when the smokeless lump coal iron is used for replacing part of coke to carry out high-temperature smelting, the quality detection parameters of the smokeless lump coal are increased, and the stable and smooth operation of the furnace condition is further ensured.
2. The coke and the anthracite block coal mixed sample is used for detection, and the actual production condition is better met. Not only can the thermal reaction strength of the smokeless lump coal be known, but also the mutual influence between coke and the smokeless lump coal with different mass proportions can be clearly shown.
Detailed Description
A method for detecting the thermal reaction strength of anthracite blocks comprises the following steps:
firstly, 200g of coke with the granularity of 20-25mm and smokeless lump coal are filled into a corundum crucible with a plurality of holes at the bottom (the mass ratio of the coke to the smokeless lump coal is determined by the ratio of coal instead of coke in an industrial test and is not a constant value, if the industrial test is not carried out, the ratio of 100g of coke to 100g of smokeless lump coal can be used for measurement);
secondly, placing the corundum crucible in a high-temperature reactor, connecting a gas path pipeline, starting to heat after checking no errors, wherein the heating rate is 10 ℃/min, heating to 400 ℃, introducing nitrogen for protection, heating to 1100 ℃, keeping the constant temperature, blowing in carbon dioxide gas or mixed gas of the carbon dioxide gas and the carbon monoxide gas, continuing for 2 hours, changing the gas into nitrogen after 2 hours, and stopping heating (if the corundum crucible is specially used for smelting a certain specific alloy, the proportion of the carbon dioxide gas can be adjusted according to the components of furnace gas);
and thirdly, taking out the sample cooled to the room temperature, separating and weighing the coke and the anthracite briquettes, putting the sample into an I-shaped rotary drum after weighing, rotating for 30 min at the rotating speed of 20 r/min, and then screening by using a round hole screen with the diameter of 10 mm, wherein the coke and the anthracite briquettes on the round hole screen respectively account for the percentage of the total amount of the sample after reaction and are the reaction strength of the coke and the anthracite briquettes.
Example 1
The sample to be tested is 200g of smokeless lump coal, the gas component at 1100 ℃ is 5L/min of carbon dioxide, and the thermal reaction strength of the smokeless lump coal is 15.6%. Specific detection schemes are shown in the following table.
Example 2
The samples to be tested are 100g of smokeless lump coal A and 100g of coke, and the gas components of the high-carbon ferrochrome are referred to, the gas components at 1100 ℃ are 3.5L/min of carbon monoxide, 0.5L/min of carbon dioxide and 0.8L/min of nitrogen. The thermal reaction strength of the anthracite briquettes was 46.2% and the thermal reaction strength of the coke was 78.8%. Specific detection schemes are shown in the following table.
Example 3
The samples to be tested are 100g of smokeless lump coal B and 100g of coke, and the reference is made to the furnace gas components of high-carbon ferrochrome, and the gas components at 1100 ℃ are 3.5L/min of carbon monoxide, 0.5L/min of carbon dioxide and 0.8L/min of nitrogen. The thermal reaction strength of the anthracite briquettes was 39.5% and the thermal reaction strength of the coke was 77.8%. Specific detection schemes are shown in the following table.
The test method is used flexibly, and the test result of example 1 can be compared with the strength parameter of coke after reaction under the national standard to compare the quality of the coke and the reducing agent. And examples 2 and 3 are general cases of the method, namely, a coke and anthracite block coal mixed sample is used for detection, the method is suitable for various industrial experimental scenes, the comparison between different types of anthracite coal is carried out, and the mutual influence between the coke and the anthracite block coal can be observed.
Claims (4)
1. A method for detecting the thermal reaction strength of smokeless lump coal is characterized by comprising the following steps: the method comprises the following steps:
firstly, filling coke and smokeless lump coal into a corundum crucible with a plurality of holes at the bottom;
secondly, placing the corundum crucible in a high-temperature reactor, connecting a gas path pipeline, starting to heat after checking, wherein the heating rate is 10 ℃/min, heating to 400 ℃, introducing nitrogen for protection, heating to 1100 ℃, keeping the constant temperature, blowing in carbon dioxide gas or mixed gas of the carbon dioxide gas and the carbon monoxide gas, continuing for 2 hours, changing the gas into nitrogen after 2 hours, and stopping heating;
and thirdly, taking out the sample cooled to the room temperature, separating and weighing the coke and the anthracite briquettes, putting the sample into an I-shaped rotary drum after weighing, rotating for 30 min at the rotating speed of 20 r/min, and then screening by using a round hole screen with the diameter of 10 mm, wherein the coke and the anthracite briquettes on the round hole screen respectively account for the percentage of the total amount of the sample after reaction and are the reaction strength of the coke and the anthracite briquettes.
2. The method for detecting the thermal reaction intensity of the smokeless lump coal according to claim 1, wherein the method comprises the following steps: in the first step, the mass ratio of the coke to the smokeless coal briquette is 1: 1.
3. The method for detecting the thermal reaction intensity of the smokeless lump coal according to claim 1, wherein the method comprises the following steps: the particle size of the coke and the smokeless coal blocks in the first step is 20-25 mm.
4. The method for detecting the thermal reaction intensity of the smokeless lump coal according to claim 1, wherein the method comprises the following steps: in the second step, the nitrogen protection nitrogen gas is introduced at a rate of 0.8L/min, the carbon dioxide gas is introduced at a rate of 5L/min or a mixed gas of 0.5L/min carbon dioxide gas and 3.5L/min carbon monoxide gas, and the nitrogen gas introduction rate after 2 hours is 0.8L/min.
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| CN202011526477.5A CN112557238A (en) | 2020-12-22 | 2020-12-22 | Method for detecting thermal reaction strength of smokeless lump coal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088569A (en) * | 2021-11-22 | 2022-02-25 | 黑龙江建龙化工有限公司 | Separation method of non-molten coal material in coking coal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842111A (en) * | 2016-05-31 | 2016-08-10 | 华北理工大学 | Testing method for metallurgical coke gasification reactivity and post-reaction strength |
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- 2020-12-22 CN CN202011526477.5A patent/CN112557238A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842111A (en) * | 2016-05-31 | 2016-08-10 | 华北理工大学 | Testing method for metallurgical coke gasification reactivity and post-reaction strength |
Non-Patent Citations (2)
| Title |
|---|
| 崔平, 杨敏, 朱玉廷, 董旭东: "焦炭和无烟煤混合物的热性质研究", 钢铁, no. 07, 30 July 2004 (2004-07-30), pages 1 - 4 * |
| 胡德生;孙维周;: "《焦炭反应性及反应后强度试验方法》中国国家标准的商榷", 宝钢技术, no. 01, 15 February 2015 (2015-02-15) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088569A (en) * | 2021-11-22 | 2022-02-25 | 黑龙江建龙化工有限公司 | Separation method of non-molten coal material in coking coal |
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