CN102928455B - Method for detecting high-temperature metallurgical performance of coke - Google Patents
Method for detecting high-temperature metallurgical performance of coke Download PDFInfo
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- CN102928455B CN102928455B CN201210416234.5A CN201210416234A CN102928455B CN 102928455 B CN102928455 B CN 102928455B CN 201210416234 A CN201210416234 A CN 201210416234A CN 102928455 B CN102928455 B CN 102928455B
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Abstract
The invention provides a method for detecting the high-temperature metallurgical performance of coke. The method is characterized by comprising the following steps of: calculating a reaction characteristic value of the coke and the CO2 gas by dynamically detecting start reaction temperatures, reaction end actual temperatures and reactivity of the coke and the CO2, and evaluating the quality of the coke, so that the less the reaction characteristic value is, the good the quality of the coke is. With the adoption of the method provided by the invention, the intrinsic problem that the quality condition of the coke when the coke is within the temperature range of 800-1400 DEG C in a blast furnace cannot be actually reflected in the conventional coke reactivity and the reacted strength index can be effectively solved, in particular in the conditions that the coke reactivity and the reacted strength are similar, and the using effect difference of the coke in the blast furnace has large difference due to the internal qualities of the coke are different, the actual quality condition of the coke is subjectively evaluated according to different reaction characteristic values (Ft) of the CO2 gas. The method provided by the invention improves and optimizes the conventional coke reactivity and the reacted strength index, so that the production of the blast furnace can be directed in a good manner.
Description
Technical field
The present invention relates to a kind of mensuration high temperature metallurgical properties of coke method, belong to technical field of coal chemical industry.
Technical background
Coke is important role in iron and steel is produced.Along with the maximization of blast furnace and the raising of coal powder injection level, the requirement of Coke Quality is also more and more higher, with conventional ash content, sulphur content, M
40, M
10the real quality level that can not reflect objectively coke quality etc. index, and more and more pay attention to coke performance at high temperature.Nineteen eighty-three, China has worked out " coke reactivity and post-reaction strength test method " national standard, regulation with coke at 1100 ℃ with CO
2the ability of gas reaction, reactive and post-reaction strength is as the important quality index of sign high temperature metallurgical properties of coke, and in succession for domestic steel mill, extensively adopts.But by coking worker research for a long time, find, these two indexs itself are also not perfect, and it also has some defects.The first, there is data to show abroad, boudouard reaction (coke and CO
2the course of reaction of gas is called the reaction of molten damage) blast furnace soft melt zone with the real reaction temperature of upper part between 800～1400 ℃, and standard regulation using 1100 ℃ as test, carry out temperature and have certain limitation, can not the behavior of real simulation coke in blast furnace; The second, even under identical reaction conditions, different coke and CO
2reaction rate during reaction is not identical yet, and adopts traditional test method, can not obtain this index.Especially close at coke reactivity and post-reaction strength, and coke is in the situation that the result of use difference in blast furnace is larger, existing coke quality index but can not reflect that coke is at the quality condition of high furnace interior completely truly.
Summary of the invention
The object of the invention is to make up the deficiency of existing coke quality evaluation index, propose a kind of assay method of high temperature metallurgical properties of coke, so that existing coke reactivity and post-reaction strength test unit are improved and to be optimized, to instruct better blast furnace to produce.
The invention provides a kind of method of measuring high temperature metallurgical properties of coke, it is characterized in that through the following step:
A. press the method for GB/T 4000-2008 standard regulation, produce coke specimen standby;
B. the sample making is put into drying box, at 170～180 ℃ of temperature, dry 2h, take out coke and be cooled to room temperature, standby;
C. be with draft tube and gas outlet thereon, the high aluminium ball that reactor bottom paving a layer thickness of its in-built thermopair is l00mm, keeps flat sieve plate on high aluminium ball, the coke specimen of step B is loaded on sieve plate, and upper cover is fixed on reactor; Reactor is suspended in stove, and makes coke in reactor in electric furnace flat-temperature zone;
When heating coke to its central temperature that D. heats up reaches 300 ℃, with the logical nitrogen of flow of 0.8L/min, protection coke, prevents its scaling loss;
When E. continuation heating coke to its central temperature reaches 750～900 ℃, cut off nitrogen, pass into the carbon dioxide that flow is 5L/min, reaction 3h, dynamic auto control during this time, and by computer measurement and control device start-of-record temperature of reaction, reaction end of a period actual temperature, maximum weight loss rate, reactivity;
F. react after 3h, stop heating, cut off carbon dioxide, pass into the nitrogen that flow is 2L/min, until coke temperature is down to room temperature, stop logical nitrogen;
G. by following formula, calculate CO
2gas reaction eigenwert, with the real quality situation of STRENGTH ON COKE, make objective evaluation:
In formula, CRI is coke and CO
2gas reaction is coke reactivity index after 3 hours;
T
beginfor coke starts temperature of reaction;
T
eventuallyfor coke gasification reaction end of a period actual temperature;
Ft is coke and CO
2gas reaction eigenwert.
The dynamic auto control of described E step is: by the quality of computer measurement and control device on-line measurement reactor, to obtain weight loss rate, when the actual weight loss rate of coke equal to set start to react weight loss rate time, obtain starting temperature of reaction point, and set coke gasification reaction 3h, temperature reaches 1100 ℃ for reaction maximum temperature, calculates accordingly heating rate, and automatically controls.
Key problem in technology of the present invention is:
A, reactor are placed in stove and are connected with suspension type balance by extension rod hook, and reactor is answered unsettled being hung, and does not make it to collide with electric furnace cover, guarantee the accuracy of the weightless data of coke that computer acquisition is arrived.
B, CO
2gas is the key reaction medium in test, therefore in test, should guarantee accurate switching and the tightness of gas circuit.
The degree of accuracy of C, computer data acquisition system and thermopair is for CO
2the calculating of gas reaction eigenwert (Ft) is most important.
The present invention compared with prior art has following advantages and effect: adopt such scheme, can effectively avoid existing coke reactivity and post-reaction strength index to exist, the intrinsic problem that can not truly reflect coke 800～1400 ℃ of temperature range coke quality situations in blast furnace, especially close at coke reactivity and post-reaction strength, but because of the difference of coke inherent quality, and cause coke in the situation that the result of use difference in blast furnace is larger, can be according to CO
2the real quality situation of the different focus charcoal of gas reaction eigenwert (Ft) is made objective evaluation.
Accompanying drawing explanation
Fig. 1 is assay device structures schematic diagram of the present invention.
In figure, 1-nitrogen cylinder, 2-CO
2gas cylinder, 5-temperature controller, 3-distribution switch board, 4-computer measurement and control device, 6-switch board, 7-rotary stationary platform, 8-electronic balance, 9-connector, 10-upper cover, 11-thermopair, 12-gas outlet, 13-reactor, 14-coke, 15-sieve plate, 16-high aluminium ball, 17-Split heating furnace, 18-base of furnace body, 19-draft tube.
Embodiment
Below by embodiment, the present invention is described further.
Embodiment 1
A kind of method of measuring high temperature metallurgical properties of coke provided by the invention, process the following step:
A. press the method for GB/T 4000-2008 standard regulation, produce coke specimen 220g standby.
B. the sample making is put into drying box, at 170 ℃ of temperature, dry 2h, take out coke and be cooled to room temperature, take 200g ± 0.5g stand-by.
C. at reactor bottom, spread the high aluminium ball of the about l00mm of a floor height, keep flat sieve plate above.Then pack coke specimen 200g ± 0.5g that step B prepares into.Note adjusting high aluminium ball height before dress sample, make the interior coke layer of reactor in electric furnace flat-temperature zone.The thermocouple sheath being connected with upper cover is inserted to bed of material center.With screw, lid and reactor shell are fixed.Reactor is placed in stove and by extension rod hook and is connected with suspension type balance, and reactor is answered unsettled being hung, and does not make it to collide with electric furnace cover.
D. reactor draft tube, gas outlet are connected with air supply system, exhaust system respectively, temperature thermocouple is inserted in reactor thermocouple sheath, High-Alumina diplopore insulation tube and High-Alumina thermocouple protection protection of pipe for thermopair; Check gas circuit, guarantee tight.
E. switch on power, when setting coke starts to react, coke weight loss rate is 0.400g/min, with precision temperature automaton, regulates electric furnace Automatic-heating.When bed of material central temperature reaches 300 ℃, with the logical nitrogen of flow of 0.8L/min, protection coke, prevents its scaling loss.
F. when bed of material central temperature reaches 750 ℃, cut off nitrogen, the carbon dioxide flow passing into after preheating is 5L/min, reaction 3h, during dynamic monitoring coke weight loss.
G. react 3h, stop heating, cut off carbon dioxide gas circuit, change logical nitrogen, flow control, at 2L/min, makes coke cool to room temperature, stops logical nitrogen.
H. according to computer-automatic collection data, 1009.1 ℃ of start-of-record temperature of reaction, 1092.0 ℃ of reaction end of a period actual temperatures, maximum weight loss rate 1.283g/min, reactive 36.3%, and press formula calculating CO
2gas reaction eigenwert is 1504.6, and record.
Embodiment 2
A kind of method of measuring high temperature metallurgical properties of coke provided by the invention, process the following step:
A. press the method for GB/T 4000-2008 standard regulation, produce coke specimen 220g standby.
B. the sample making is put into drying box, at 175 ℃ of temperature, dry 2h, take out coke and be cooled to room temperature, take 200g ± 0.5g stand-by.
C. at reactor bottom, spread the high aluminium ball of the about l00mm of a floor height, keep flat sieve plate above.Then pack coke specimen 200g ± 0.5g that step B prepares into.Note adjusting high aluminium ball height before dress sample, make the interior coke layer of reactor in electric furnace flat-temperature zone.The thermocouple sheath being connected with upper cover is inserted to bed of material center.With screw, lid and reactor shell are fixed.Reactor is placed in stove and by extension rod hook and is connected with suspension type balance, and reactor is answered unsettled being hung, and does not make it to collide with electric furnace cover.
D. reactor draft tube, gas outlet are connected with air supply system, exhaust system respectively, temperature thermocouple is inserted to (High-Alumina diplopore insulation tube and High-Alumina thermocouple protection protection of pipe for thermopair) in reactor thermocouple sheath.Check gas circuit, guarantee tight.
E. switch on power, when setting coke starts to react, coke weight loss rate 0.200g/min, regulates electric furnace Automatic-heating with precision temperature automaton.When bed of material central temperature reaches 300 ℃, with the logical nitrogen of flow of 0.8L/min, protection coke, prevents its scaling loss.
F. when bed of material central temperature reaches 800 ℃, cut off nitrogen, the carbon dioxide flow passing into after preheating is 5L/min, reaction 3h, during dynamic monitoring coke weight loss.
G. react 3h, stop adding thermal cut-out carbon dioxide gas road, change logical nitrogen, flow control, at 2L/min, makes coke cool to room temperature, stops logical nitrogen.
H. according to computer-automatic collection data, 1037.4 ℃ of start-of-record temperature of reaction, 1089.2 ℃ of reaction end of a period actual temperatures, maximum weight loss rate 1.35g/min, reactive 33.30%, and press formula calculating CO
2gas reaction eigenwert is 862.5, and record.
Embodiment 3
A kind of method of measuring high temperature metallurgical properties of coke provided by the invention, process the following step:
A. press the method for GB/T 4000-2008 standard regulation, produce coke specimen 220g standby.
B. the sample making is put into drying box, at 180 ℃ of temperature, dry 2h, take out coke and be cooled to room temperature, take 200g ± 0.5g stand-by.
C. at reactor bottom, spread the high aluminium ball of the about l00mm of a floor height, keep flat sieve plate above.Then pack coke specimen 200g ± 0.5g that step B prepares into.Note adjusting high aluminium ball height before dress sample, make the interior coke layer of reactor in electric furnace flat-temperature zone.The thermocouple sheath being connected with upper cover is inserted to bed of material center.With screw, lid and reactor shell are fixed.Reactor is placed in stove and by extension rod hook and is connected with suspension type balance, and reactor is answered unsettled being hung, and does not make it to collide with electric furnace cover.
D. reactor draft tube, gas outlet are connected with air supply system, exhaust system respectively, temperature thermocouple is inserted to (High-Alumina diplopore insulation tube and High-Alumina thermocouple protection protection of pipe for thermopair) in reactor thermocouple sheath.Check gas circuit, guarantee tight.
E. switch on power, when setting coke starts to react, coke weight loss rate 0.200g/min, regulates electric furnace Automatic-heating with precision temperature automaton.When bed of material central temperature reaches 300 ℃, with the logical nitrogen of flow of 0.8L/min, protection coke, prevents its scaling loss.
F. when bed of material central temperature reaches 900 ℃, cut off nitrogen, the carbon dioxide flow passing into after preheating is 5L/min, reaction 3h, during dynamic monitoring coke weight loss.
G. react 3h, stop adding thermal cut-out carbon dioxide gas road, change logical nitrogen, flow control, at 2L/min, makes coke cool to room temperature, stops logical nitrogen.
H. according to computer-automatic collection data, 1065.2 ℃ of start-of-record temperature of reaction, 1096.6 ℃ of reaction end of a period actual temperatures, maximum weight loss rate 1.300g/min, reactive 33.20%, and press formula calculating CO
2gas reaction eigenwert is 521.2, and record.
Claims (1)
1. measure a method for high temperature metallurgical properties of coke, it is characterized in that through the following step:
A. press the method for GB/T 4000-2008 standard regulation, produce coke specimen standby;
B. the sample making is put into drying box, at 170～180 ℃ of temperature, dry 2h, take out coke and be cooled to room temperature, standby;
C. be with draft tube and gas outlet thereon, the high aluminium ball that reactor bottom paving a layer thickness of its in-built thermopair is l00mm, keeps flat sieve plate on high aluminium ball, the coke specimen of step B is loaded on sieve plate, and upper cover is fixed on reactor; Reactor is suspended in stove, and makes coke in reactor in electric furnace flat-temperature zone;
When heating coke to its central temperature that D. heats up reaches 300 ℃, with the logical nitrogen of flow of 0.8L/min, protection coke, prevents its scaling loss;
When E. continuation heating coke to its central temperature reaches 750～900 ℃, cut off nitrogen, pass into the carbon dioxide that flow is 5L/min, reaction 3h, dynamic auto control during this time, and by computer measurement and control device start-of-record temperature of reaction, reaction end of a period actual temperature, maximum weight loss rate, reactivity;
F. react after 3h, stop heating, cut off carbon dioxide, pass into the nitrogen that flow is 2L/min, until coke temperature is down to room temperature, stop logical nitrogen;
G. by following formula, calculate CO
2gas reaction eigenwert, with the real quality situation of STRENGTH ON COKE, make objective evaluation:
In formula, CRI is coke and CO
2gas reaction is coke reactivity index after 3 hours;
T
beginfor coke starts temperature of reaction;
T
eventuallyfor coke gasification reaction end of a period actual temperature;
Ft is coke and CO
2gas reaction eigenwert;
The dynamic auto control of said E step is: by the quality of computer measurement and control device on-line measurement reactor, to obtain weight loss rate, when the actual weight loss rate of coke equal to set start to react weight loss rate time, obtain starting temperature of reaction point, and set coke gasification reaction 3h, temperature reaches 1100 ℃ for reaction maximum temperature, calculates accordingly heating rate, and automatically controls.
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| CN103234853A (en) * | 2013-04-03 | 2013-08-07 | 莱芜钢铁集团有限公司 | Testing apparatus for research on reducibility of single-particle iron ore |
| CN103808623A (en) * | 2014-02-20 | 2014-05-21 | 武钢集团昆明钢铁股份有限公司 | Method for detecting reactivity and post-reaction strength of coke |
| WO2015158170A1 (en) * | 2014-04-14 | 2015-10-22 | 哈尔滨工业大学 | In-situ decoupling based gas/solid reaction analyzing device and analyzing method |
| CN104297282B (en) * | 2014-10-27 | 2017-02-01 | 武汉钢铁(集团)公司 | Coke thermal property analyzing method and device for realizing method |
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| CN106680135B (en) * | 2016-11-09 | 2023-08-08 | 山东钢铁股份有限公司 | Device and method for measuring high-temperature metallurgical property of coke |
| CN108106961A (en) * | 2016-11-25 | 2018-06-01 | 上海梅山钢铁股份有限公司 | A kind of detection method of blast furnace ironmaking coke reactivity |
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| CN109596662A (en) * | 2017-09-30 | 2019-04-09 | 上海梅山钢铁股份有限公司 | A method of the detection hot powder performance of coke |
| CN108593700B (en) * | 2018-05-11 | 2020-12-11 | 武汉钢铁有限公司 | Test method and simulation device for simulating degradation process of coke in blast furnace reflow zone |
| CN111809008B (en) * | 2020-06-30 | 2022-03-29 | 武汉钢铁有限公司 | Blast furnace coke thermal property grading control method based on different coal injection ratios |
| CN112903513A (en) * | 2021-01-13 | 2021-06-04 | 东北大学 | Method for measuring high-temperature pulverization performance of iron coke |
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