CN102928454A - Method and device for detecting ferrous coke hot-state performance - Google Patents
Method and device for detecting ferrous coke hot-state performance Download PDFInfo
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- CN102928454A CN102928454A CN2012104059147A CN201210405914A CN102928454A CN 102928454 A CN102928454 A CN 102928454A CN 2012104059147 A CN2012104059147 A CN 2012104059147A CN 201210405914 A CN201210405914 A CN 201210405914A CN 102928454 A CN102928454 A CN 102928454A
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Abstract
The invention discloses a method and a device for detecting ferrous coke hot-state performance. The method comprises the following steps of: taking 200-400+/-5g of ferrous coke sample with the particle size of 21 to 25mm, measuring the ferrous coke hot-state performance in a heating system, analyzing a carbon content change rate in the sample before and after reaction by using a chemical analysis method, taking the carbon content change rate as a reaction index of the ferrous coke, measuring change of CO2 and CO concentration in the reaction process by employing a gas analyzer, and determining the initial reaction temperature and maximum reaction rate temperature of the ferrous coke. The detection device comprises an electric furnace, wherein a silicon carbide rod in the electric furnace is communicated with a precision temperature controller; a high-temperature alloy steel reactor is inserted into the electric furnace; a temperature control thermocouple is arranged in a ferrous coke sample layer; a gas inlet tube is sequentially communicated with a flow regulator and a flowmeter; an electric furnace heating and keeping system is controlled by the precision temperature controller; and gas detection and data processing in the reaction process are processed by a gas monitoring and data processing system.
Description
Technical field
The invention belongs to the coking technology field, relate to a kind of detection method and pick-up unit of iron coke hot performance of blast furnace use.
Background technology
Japanese scholars utilizes RIST operation line chart to the further development research of blast furnace reaction mechanism, has proposed low temperature heat accumulation band (hot dead zone) blast furnace process new ideas, and having studied reduction blast furnace heat accumulation band can decrease ironmaking energy consumption and minimizing CO
2Discharge capacity, thereby developed some technical measures, such as high response coke technology, carbon containing hot pressing pelletizing technology etc.Iron coke is that coal and iron ore are pulverized in advance, after the mixing, moulding, with the gas retort heating, made iron ore generation partial reduction wherein, becomes the coke of the reduced iron with certain degree of metalization.Because molten damage reaction has strong catalytic action to metallic iron to carbon in the iron coke, can reduce the coke rapid-action and begin that thereby temperature can reduce blast furnace heat accumulation district temperature, simultaneously it can improve the molten damage reaction rate of carbon, thereby improve iron ore at the reduction degree in indirect reduction interval and then reduce blast furnace coke ratio.
For metallic iron in the effective evaluation iron coke to problems such as the intensity of variation of carbon reaction rate in the influence degree of the molten loss rate of carbon, the iron coke and iron coke post-reaction strengths, simultaneously also for scientific guidance iron coke production technology, improve the iron coke quality and for blast furnace operating provides technical parameter, need to research and develop a kind of detection technique of new iron coke hot performance.
At present, there is not yet the documents and materials of iron coke hot performance detection method both at home and abroad, only have the reactive detection method of coke aspect.Among the State Standard of the People's Republic of China GB/T 4000-2008, answering property of coke and post-reaction strength test method have been introduced.Coke reactivity (CRI): take by weighing the coke sample of certain mass, place reactor, when 5 ℃ of 1100 ℃ of scholars and carbon dioxide reaction after 2 hours, represent with the percentage of the loss of coke quality; Behind the coke gasification reaction strong (CSR): coke after the reaction after drum test, represents with the mass percent that accounts for the rear coke of reaction greater than 10 millimeters grade cokes.
Mention some countries (or enterprise) in " coking " Yao Zhaozhang (metallurgical industry publishing house, 1982) book and measure grain reactivity of coke method.Such as international standard ISO/TC27, GT8175F, Chinese GB220-77, Japanese JIS K2151-62 etc. adopt reaction gas CO and CO in the coke gasification reaction process
2The situation of change that forms is weighed reactivity.
CN101825548A discloses detection method and the device thereof of a kind of coke reactivity and post-reaction heat-treatability, detects coke gasification and begins temperature, reactivity and post-reaction heat-treatability.Coke reactivity detects, and carries out under the isothermy after formerly heating up, and with the weight loss of electronics balance measurement coke specimen, when the coke weight-loss ratio reaches setting, detects weight loss rate (time)
One 1As reactive indices; Coke gasification reaction after-baking detection when the coke weight-loss ratio reaches setting, continues to heat up under inert gas shielding, detects during Heat Treatment coke quality loss percentage as the post-reaction heat-treatability index.
CN101710054 A provides a kind of coke reactivity assay method and determinator, at first coke is crushed to 74 ~ 386 μ m, then puts into special crucible, and thermobalance is warming up to 700 ~ 1100 ℃ with the heating rate of 5 ~ 30 ℃/min, and logical N
2Protection, logical CO behind the arrival assigned temperature
2Reaction continues in the course of reaction to heat up with the speed of 1 ~ 10 ℃/min, does weight-hygrogram after reaction is finished, and gets coke gasification reaction and begins temperature (TS), begins temperature as the standard of weighing the coke reactivity quality with coke gasification reaction.
There is following problem in the method and apparatus of carrying in above patent and the document for detection of the hot performance of iron coke: (1) is if represent that with qualitative change before and after the reaction reactivity of iron coke is unscientific, because iron coke and CO
2Not only there is carbon in the iron coke that molten damage reaction occurs in the course of reaction and causes the minimizing of quality, and also have in the iron coke metallic iron when playing catalytic action, by CO
2Be oxidized to the increase that ferriferous oxide draws quality.Therefore can't characterize the reactivity of iron coke with mass change before and after the iron coke reaction.(2) if same with reaction gas CO and CO in the course of reaction of iron coke
2The reactivity that the situation of change that forms characterizes iron coke also is unscientific, metallic iron and CO under high-temperature condition
2Reaction generates CO and ferriferous oxide, increases the concentration of reaction gas CO in the course of reaction, the reactivity of exaggerative iron coke.(3) existing coke reactivity measurement standard be at a certain temperature with carbon dioxide reaction 2 hours, can't really simulate the action process (coke through heat accumulation band be a slow temperature-rise period) of coke in blast furnace.(4) measuring method that has can't be measured the beginning temperature of reaction of iron coke, the important parameters such as maximum reaction rate temperature.
If it is reactive to detect iron coke with existing coke reactivity and post-reaction strength test method, might forms the evaluation of iron coke high-temperature behavior quality and mislead, and cause the unreasonable adapted that coheres by force coal to rare.For this reason, for ironmaking and coking worker, all in the urgent need to the detection method of a new iron coke hot performance is provided, provide scientific basis for improving the iron coke quality, improve Coal Blending Technology and adjusting blast furnace operating.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, technical matters to be solved by this invention provides a kind of detection method and pick-up unit of new iron coke hot performance, and then determine hot performance index into the stove iron coke, and provide scientific basis for from now on iron coke production and performance evaluation thereof.
A kind of detection method of iron coke hot performance is characterized in that the method comprises following content:
The iron coke hot performance detects, get iron coke sample 200 ~ 400 scholar 5g(different according to the different iron coke quality of getting of carbon content in the iron coke), granularity 21～25mm, under certain temperature increasing schedule, measure the iron coke hot performance, rate of change with carbon content in the sample before and after the chemical analysis analytical reactions, and with its reactive indices as iron coke, adopt simultaneously gas analyzer to measure CO in the course of reaction
2Determine that with the variation of CO concentration iron coke begins temperature of reaction and maximum reaction rate temperature.
Detecting step is:
1. through-current capacity is the N of 1 ~ 5L/min in draft tube (9)
2Down, the heating rate with 5 ~ 20 ℃/min rises to 400 ℃ from room temperature, constant temperature 30min;
2. then in draft tube (9), change the CO that through-current capacity is 5 ~ 20 L/min
2Gas rises to 1100 ℃ with the heating rate of 5 ~ 20 ℃/min;
3. then changing through-current capacity in draft tube (9) is 5 ~ 20 L/minN
2Gas is cooled to coke test layer temperature stove below 100 ℃, stops logical N
2Gas;
4. take out sample give over to react before and after carbon content analysis in the iron coke, and with the reactive indices of carbon content rate of change as iron coke.
5. by to step 1.-3. temperature and the CO of gas analyzer record in the process
2Process with the CO concentration data, do temperature-CO concentration curve, begin corresponding temperature with generation CO and represent that iron coke begins temperature of reaction, find out simultaneously maximum reaction rate corresponding temperature and put to characterize.
A kind of pick-up unit for claim 1 iron coke hot performance detection method, comprise electric furnace, Elema in the electric furnace is communicated with precision temperature controller, the high-temperature alloy steel reactor inserts in the electric furnace, the high-temperature alloy steel reactor with draft tube, temperature-control heat couple and escape pipe, be respectively from the bottom to top high aluminium ball, iron coke sample in the reaction tube of high-temperature alloy steel reactor, temperature-control heat couple is inserted in the iron coke sample layer, draft tube is communicated with flow regulator, flowmeter successively, and flowmeter is communicated with respectively and N
2Gas cylinder and CO
2Gas cylinder is communicated with, and escape pipe is communicated with data handling system with gas-monitoring, and electric furnace heats up and the constant temperature system is controlled by precision temperature controller, and gas detects and processes by gas-monitoring and data handling system processing with data in the course of reaction.
N
2Gas cylinder and flowmeter, CO
2Gas cylinder and flowmeter, escape pipe and gas-monitoring and data handling system are respectively equipped with air valve and gas cleaning unit, and temperature-control heat couple is connected by the insertion of the thermopair entrance on the reaction tube Sealed casing pipe with the high-temperature alloy steel reactor.
A kind of iron coke hot performance detection method and pick-up unit have been set up, it can detect the iron coke reactivity simultaneously and iron coke begins temperature of reaction and maximum rate temperature, scientific and reasonable evaluation iron coke high-temperature behavior, and provide scientific basis for improving the iron coke quality, improve Coal Blending Technology and adjusting blast furnace operating.
Description of drawings
Fig. 1 is iron coke hot performance pick-up unit of the present invention;
Fig. 2 is iron coke 1 among the embodiment
#Temperature-CO concentration curve;
Fig. 3 is iron coke 2 among the embodiment
#Temperature-CO concentration curve;
Fig. 4 is iron coke 3 among the embodiment
#Temperature-CO concentration curve;
1N
2Gas cylinder, 2CO
2Gas cylinder, 3 air valves, 4 gas cleaning units, 5 flowmeters, 6 flow regulators, 7 electric furnaces, 8 Elemas, 9 draft tube, 10 temperature-control heat couple, 11 escape pipes, 12 high-temperature alloy steel reactors, 13 precision temperature controllers, 14 gas-monitorings and data handling system.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
The pick-up unit of iron coke hot performance detection method, comprise electric furnace 7, Elema 8 in the electric furnace 7 is communicated with precision temperature controller 13, high-temperature alloy steel reactor 12 inserts in the electric furnace 7, high-temperature alloy steel reactor 12 with draft tube 9, temperature-control heat couple 10 and escape pipe 11, be respectively from the bottom to top high aluminium ball, iron coke sample in the reaction tube of high-temperature alloy steel reactor 12, temperature-control heat couple 10 is inserted in the iron coke sample layer, draft tube 9 is communicated with flow regulator 6, flowmeter 5 successively, and flowmeter 5 is communicated with respectively and N
2Gas cylinder 1 and CO
2Gas cylinder 2 is communicated with, and escape pipe 11 is communicated with data handling system 14 with gas-monitoring, and electric furnace 7 heats up and the constant temperature system is controlled by precision temperature controller 13, and gas detects and processed by gas-monitoring and data handling system 14 with the data processing in the course of reaction.
N
2Gas cylinder 1 and flowmeter 5, CO
2Gas cylinder 2 is respectively equipped with air valve 3 and gas cleaning unit 4 with flowmeter 5, escape pipe 11 with gas-monitoring and data handling system 14, and temperature-control heat couple 10 is connected by the insertion of the thermopair entrance on the reaction tube Sealed casing pipe with high-temperature alloy steel reactor 12.
The iron coke hot performance detects, and detects for 3 kinds of iron coke samples (wherein 1#, 2# and 3# sample all iron content are about respectively 10%, 20%, 30%).Get 1# iron coke sample 220 scholar 5g, 2# iron coke sample 250 scholar 5g, 3# iron coke sample 285 scholar 5g(according to the different iron coke quality differences of getting of carbon content in the iron coke), granularity 21mm～25mm, under certain temperature increasing schedule, measure the iron coke hot performance, under certain temperature increasing schedule, measure the iron coke hot performance, rate of change with carbon content in the sample before and after the chemical analysis analytical reactions, and with its reactive indices as iron coke, adopt simultaneously gas analyzer to measure CO in the course of reaction
2Determine that with the variation of CO concentration iron coke begins temperature of reaction and maximum reaction rate temperature.Detecting step is:
1. through-current capacity is the N of 5L/min in draft tube (9)
2Down, the heating rate with 5 ℃/min rises to 400 ℃ from room temperature, constant temperature 30min;
2. then in draft tube (9), change the CO that through-current capacity is 5 L/min
2Gas rises to 1100 ℃ with the heating rate of 5 ℃/min;
3. then changing through-current capacity in draft tube (9) is 5 L/minN
2Gas is cooled to coke test layer temperature stove below 100 ℃, stops logical N
2Gas;
4. take out sample give over to react before and after carbon content analysis in the iron coke, and with the reactive indices of carbon content rate of change as iron coke.
5. by to step 1.-3. temperature and the CO of gas analyzer record in the process
2Process with the CO concentration data, do temperature-CO concentration curve, begin corresponding temperature with generation CO and represent that iron coke begins temperature of reaction, find out simultaneously maximum reaction rate corresponding temperature and put to characterize, testing result sees Table 1.
The reactive testing result of table 1
As can be seen from the above embodiments: use this iron coke hot performance measuring method can effectively measure different metal content iron coke hot performance, and can be analyzed, for iron and steel enterprise produces iron coke and performance evaluation provides a kind of standard.
Claims (3)
1. the detection method of an iron coke hot performance, it is characterized in that: get iron coke sample 200 ~ 400 scholar 5g, granularity 21～25mm, under temperature increasing schedule, measure the iron coke hot performance, rate of change with carbon content in the sample before and after the chemical analysis analytical reactions, and with its reactive indices as iron coke, adopt simultaneously gas analyzer to measure CO in the course of reaction
2Determine that with the variation of CO concentration iron coke begins temperature of reaction and maximum reaction rate temperature, detecting step is:
1. through-current capacity is the N of 1 ~ 5L/min in draft tube (9)
2Down, the heating rate with 5 ~ 20 ℃/min rises to 400 ℃ from room temperature, constant temperature 30min;
2. then in draft tube (9), change the CO that through-current capacity is 5 ~ 20 L/min
2Gas rises to 1100 ℃ with the heating rate of 5 ~ 20 ℃/min;
3. then changing through-current capacity in draft tube (9) is 5 ~ 20 L/minN
2Gas is cooled to coke test layer temperature stove below 100 ℃, stops logical N
2Gas;
4. take out sample give over to react before and after carbon content analysis in the iron coke, and with the reactive indices of carbon content rate of change as iron coke;
5. by to step 1.-3. temperature and the CO of gas analyzer record in the process
2Process with the CO concentration data, do temperature-CO concentration curve, begin corresponding temperature with generation CO and represent that iron coke begins temperature of reaction, find out simultaneously maximum reaction rate corresponding temperature and put to characterize.
2. pick-up unit that is used for claim 1 iron coke hot performance detection method, comprise electric furnace (7), Elema (8) in the electric furnace (7) is communicated with precision temperature controller (13), high-temperature alloy steel reactor (12) inserts in the electric furnace (7), high-temperature alloy steel reactor (12) with draft tube (9), temperature-control heat couple (10) and escape pipe (11), be respectively from the bottom to top high aluminium ball in the reaction tube of high-temperature alloy steel reactor (12), the iron coke sample, temperature-control heat couple (10) is inserted in the iron coke sample layer, draft tube (9) successively with flow regulator (6), flowmeter (5) is communicated with, and flowmeter (5) is communicated with respectively and N
2Gas cylinder (1) and CO
2Gas cylinder (2) is communicated with, escape pipe (11) is communicated with data handling system (14) with gas-monitoring, electric furnace (7) heats up and the constant temperature system is controlled by precision temperature controller (13), and gas detects and processes by gas-monitoring and data handling system (14) processing with data in the course of reaction.
3. the pick-up unit of iron coke hot performance detection method according to claim 2 is characterized in that: N
2Gas cylinder (1) and flowmeter (5), CO
2Gas cylinder (2) is respectively equipped with air valve (3) and gas cleaning unit (4) with flowmeter (5), escape pipe (11) with gas-monitoring and data handling system (14), and temperature-control heat couple (10) is connected by the insertion of the thermopair entrance on the reaction tube Sealed casing pipe with high-temperature alloy steel reactor (12).
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| CN103323490A (en) * | 2013-06-26 | 2013-09-25 | 武汉钢铁(集团)公司 | Device and method for detecting solution loss initial temperature and solution loss speed of coke |
| CN103940697A (en) * | 2014-03-26 | 2014-07-23 | 北京科技大学 | Test method for blast furnace coke reactivity |
| CN104297282A (en) * | 2014-10-27 | 2015-01-21 | 武汉钢铁(集团)公司 | Coke thermal property analyzing method and device for realizing method |
| CN105651407A (en) * | 2016-03-07 | 2016-06-08 | 武汉科技大学 | Metallurgical coke initial reaction temperature measurement method and device |
| CN106383165A (en) * | 2016-12-07 | 2017-02-08 | 邯郸学院 | Method for continuously measuring reaction speed of carbon-containing solid substances such as coal |
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| CN114486794A (en) * | 2022-01-25 | 2022-05-13 | 华北理工大学 | Coke, steam and carbon dioxide co-gasification reaction detection device and method |
| CN114486794B (en) * | 2022-01-25 | 2024-01-26 | 华北理工大学 | Cogasification reaction detection device and method for coke, water vapor and carbon dioxide |
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