CN109596662A - A method of the detection hot powder performance of coke - Google Patents
A method of the detection hot powder performance of coke Download PDFInfo
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- CN109596662A CN109596662A CN201710918694.0A CN201710918694A CN109596662A CN 109596662 A CN109596662 A CN 109596662A CN 201710918694 A CN201710918694 A CN 201710918694A CN 109596662 A CN109596662 A CN 109596662A
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- coke
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- dusting
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- 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
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
Abstract
The invention discloses a kind of methods for detecting the hot powder performance of coke, mainly solve the undetectable technical problem of the hot powder performance of coke in the prior art.A kind of method detecting the hot powder performance of coke provided by the invention, comprising: 1) prepare coke specimen；2) coke specimen is dried；3) STRENGTH ON COKE sample carries out reactive test；4) it is sieved after coke is cooling, weighs the partial size < 10mm coke screened out and obtain m1；5) partial size>=10mm coke screened out is placed in I type rotary drum and rotates 400-800 circle, take out coke in rotary drum, weighed particle size<10mm coke and obtain m2；6) dusting index CPR after calculating coke gasification reaction；The method of the present invention can preferably evaluate dusting situation of the coke after blast furnace soft heat vigorous reaction.
Description
Technical field
The present invention relates to a kind of detection this method of coke property, in particular to a kind of detection hot powder performance of coke
Method belongs to coke quality detection field for evaluating coke in the powder performance of bottom house.
Background technique
Coke plays heat source, reducing agent, skeleton and molten iron carburizing four effects in blast furnace.It in recent years, is reduction coke
Consumption increases furnace processor, improves iron quality, uses in tuyere injection coal dust, the reinforcement techniques such as oxygen-enriched air blast, coke is made
It for heat source, reducing agent and the effect of carburizing, can partially be replaced to a certain extent, but be made as the loose skeleton of blast furnace stock column
With cannot be substituted, and with blast furnace enlargement and strengthening smelting, the effect is more prominent.Coke powder performance is blast furnace emphasis
One of index of concern, it directly affects the permeability of blast furnace.Blast furnace is divided into lump zone, cohesive zone, dropping zone from up to down
With air port region.
Lump zone refers to that position of the furnace bosh temperatures above lower than 1000 DEG C or so has no viscous since ore is still in solid-state
Phenomenon, so all furnace charges keep stratiform substantially.In lumpy zone in blast furnace, the carbon element loss of coke is in increased from top to bottom
Trend, but increase and be no more than 10%.
M is thought in document 1, quality index of coke in the blast furnace analysis (Zhou Shiyong, ironmaking, 2004,14 (1): 25-28.) research10It
Indicate that the wear-resistant strength of coke, its STRENGTH ON COKE be in lumpy zone in blast furnace, coke and coke, coke and ore, coke and furnace wall it
Between abrasion have good simulation.For coke row to lump zone bottom, temperature is more than 850 DEG C, and has touched alkali race way
Faint carbon's solution loss reaction, CO takes place in edge2It can be diffused into inside coke, start to destroy coke surface structure, such M10
Simulation is just gradually lost.
Soft melt zone is in furnace bosh, at bosh, the position that temperature is 900-1300 DEG C or so.Ore from outward appearance to inner essence gradually softens
Melting, and coke is still in that bulk plays the role of loose and keeps air-flow unimpeded.Since this region carbon's solution loss reaction is violent, carbon in coke
Loss up to 20-40%.So far, coke structure is destroyed, and coke lumpiness, intensity sharply decline, and wearability significantly reduces,
There are more coke cutting and coke powder to generate, it is unimpeded to be unfavorable for air-flow.At present with coke CO2The height of post reaction strength degree is evaluated pair
The influence of blast furnace.
The Chinese patent application file of application publication number CN105842065A discloses commenting for smelter coke post reaction strength
Valence method, coke is heated to start logical reaction atmosphere after the lower limit value of range of reaction temperature to react, during the reaction
It at the uniform velocity heats up, makes the upper limit value for being just warming up to range of reaction temperature at the end of reaction, assist atmosphere flow not in reaction process
Become, by adjusting CO and CO2Flow so that the practical weight loss rate of coke is bonded Response calculation weight loss rate always, until coke
The final weight-loss ratio for reaching setting obtains the post reaction strength of coke for drum test is carried out after the coke cooling after reaction.It should
Invention preferably simulates reaction process of the coke in blast furnace, keeps the numerical value truly expressed for finally obtaining post reaction strength burnt
Use state in the blast furnace of charcoal.
Document 2, stamp-charging coke high temperature carbon thrombolytic agents behavioral study (Zhang little Yong, Wu Guangyou, Zheng Mingdong etc., coal conversion,
2015,38 (1): 53-57.) selection is representational makes coke firm by ramming, in continuous thermal reaction apparatus, investigate burnt under different temperatures
Charcoal and CO2Reflex action, announcement make degradation mechanism of the coke in blast furnace firm by ramming, the results showed that, under isothermy, different coke with
CO2When the level of reaction to 30%, overall linear rule changes conversion ratio at any time, dusting degree and coke after carbon's solution loss reaction
Apparent porosity and apparent activation energy are related, and dusting is mainly based on reaming and aperture.
Dropping zone temperature is at 1350 DEG C or more, and carbon's solution loss reaction has weakened herein, the destruction of STRENGTH ON COKE mainly from
The melt cinder that constantly drips and liquid iron wash away.Since carbon's solution loss reaction herein is not violent, coke be still able to maintain certain intensity with
Lumpiness, therefore it still becomes the channel of ascending air rises and guarantees that blast furnace has-fixed gas permeability and distribution air-flow and transparent liquid iron
With the effect of melt cinder.
After Tuyere Raceway hot-air is blasted by air port, coke bears 2000 DEG C or more of high temperature and quick whirlwind herein
Effect of impact, and violent burning occurs provides heat and reducing gas for blast furnace, and coke is into this region of people, that is, rapid dusting.
Document 3 inhibits the coke characteristic and blast furnace operating condition of coke dusting in Blast Furnace Raceway (to cross wall Shi Lang, Anshan iron and steel plant
Technology, 2003, (5): 51-56) in order to study the deterioration of block coke caused by gasification reaction and impact force destruction coke degradation layer behavior,
Coke by gasification reaction to deterioration applies impact force, is determined and evaluates the trial of powdering amount.It is burnt using coke
Experiment and the coke acquired from No. 5 blast furnaces of Chiba factory, have studied the dusting behavior of coke in raceway zone.Coke combustion experiment confirms
Coke pulverization rate in dead stock column is as the decline of coke strenth, coke CRI reduce, the reduction of flame temperature or blast velocity
Raising and increase, and demonstrate influence of the coke characteristic to coke dusting in raceway zone.These results mean the gas of coke
Change reaction and dusting occurs for the broken coke resulted in raceway zone.
According to research and generate practice the result shows that, coke quality have become construction furnace volume size it is decisive
The deciding factor of the how many deciding factor of factor, total coal powder and cupola well state.In order to evaluate coke dusting journey
The influence to blast furnace is spent, uses M in lumpy zone in blast furnace document 110Index, with less than 10mm coke shared by ratio characterize
The dusting degree of coke；Pass through the impact in simulation air port, measurement and evaluation coke blacking in the Tuyere Raceway of blast furnace, such as document 3
Change amount；The index of post reaction strength of coke CSR is used in the cohesive zone of blast furnace, the China of application publication number CN105842065A is specially
Sharp application documents disclose STRENGTH ON COKE post reaction strength index and are improved, and preferably simulate coke degradation process；Application is public
The Chinese patent application file of cloth CN103940697A discloses a kind of blast-furnace coke reactivity test method, for simulating height
The carbon's solution loss reaction of furnace difference coal ejection ratio operating condition coke can more connect since reaction temperature is high, reaction tolerance is few and the reaction time is short
The actual response situation of nearly blast furnace, coke quality can more reasonably be evaluated by testing the result obtained.Application publication number
The Chinese patent application file of CN102928455A discloses a kind of method for measuring high temperature metallurgical properties of coke, is examined by dynamic
Survey coke and CO2The reaction starting temperature of gas, reaction end of a period actual temperature, reactivity, calculate coke and CO2The reaction of gas
Characteristic value, and Coke Quality is evaluated, response feature value is smaller, and coke quality in kind is better.
But go deep into research, these indexs itself are also and perfect, and there is also some defects.
First, M is had for bulk of the coke in blast furnace10Powder performance is simulated, has obtained universal approval, but for
Blast furnace permeability influences maximum cohesive zone coke powder performance still without evaluation index.
Second, have centainly for National Standard Method (GB/T 4000-2008) method for measuring coke reactivity and post reaction strength
Limitation, in the Chinese patent application file and application publication number CN102928455A of application publication number CN103940697A
State's patent application document introduces fixed weight-loss ratio and refers to as detection by introducing initial reaction temperature as evaluation index
Mark is the supplement to national standard but still is not directed to the evaluation of coke dusting.
Summary of the invention
The object of the present invention is to provide a kind of method for detecting the hot powder performance of coke, mainly solve burnt in the prior art
The undetectable technical problem of the hot powder performance of charcoal, the method for the present invention for evaluating coke in the powder performance of bottom house,
It is measured by STRENGTH ON COKE dusting index, characterizes influence of dusting of the coke in bottom house to blast furnace permeability.
The technical solution adopted by the present invention is that a method of the detection hot powder performance of coke, this method includes following
Step:
1) coke specimen is prepared, the partial size for controlling coke specimen is 23-25mm；
2) coke specimen is dried, coke specimen is put into baking oven, 1.5~2.5h is dried at 105~120 DEG C, is taken out
It is spare that coke specimen is cooled to 15~25 DEG C of sealings；
3) STRENGTH ON COKE sample carries out reactive test, and the 200g coke specimen dried is placed in coke gasification reaction system safety testing device
In；The heating-rate curve for manipulating coke gasification reaction system safety testing device setting coke, is risen according to heating-rate curve STRENGTH ON COKE
Temperature, heat preservation, are passed through protective gas into coke gasification reaction system safety testing device；Manipulate computer acquisition and holding time, atmosphere and
Coke Weight loss data；
4) it is sieved after coke is cooling, the coke for weighing the partial size < 10mm screened out obtains m1；
5) partial size >=10mm coke screened out is placed in I type rotary drum and rotates 400-800 circle, taken out in I type rotary drum
Coke, the coke for weighing particle size < 10mm obtain m2；
6) dusting index CPR (Coke Powder after Reaction) after coke gasification reaction, powder after coke gasification reaction are calculated
Change index CPR to be calculated according to formula one,
CPR=(m1+m2)/200*100% formula one, in formula one, m1As described in step 4)；m2As described in step 5).
The present invention obtains dusting index after the reaction of coke, and then characterizes powder performance after the reaction of coke.
The evaluation method of powder performance after coke gasification reaction proposed by the present invention is that researcher is had found by a large number of experiments, burnt
Charcoal dusting has a great impact to the pressure difference and gas permeability of blast furnace, wherein coke wear-resistant strength M10Simulation is coke on blast furnace
The coke dusting in portion has apparent influence for the direct motion of blast furnace；And melt in bottom house iron ore, the at this moment skeleton of coke
Act on even more important, violent chemical reaction has occurred in coke, and at this moment influence of the dusting of coke to blast furnace permeability is more significant,
But the dusting of coke after the reaction is still characterized without index at present, is solely focused on the reactivity and post reaction strength of coke.And
Mass production is practice have shown that the reactivity and post reaction strength of coke are gradually under suspicion to the directive significance of blast furnace.
With the comparison of other detection methods evaluation coke powder performance, the coke dusting that bibliography 2 is studied is that nature is de-
The coke powder amount fallen, and by friction and Extrusion in blast furnace, it is anti-in blast furnace that the coke powder amount to fall off naturally is not enough to describe coke
It answers；Bibliography 3 supplements impact force and O using the coke combustion experiment of simulation raceway zone condition2Micro mist caused by burning disappears
Coke dusting behavior in the raceway zone of two conditions is consumed, experimental condition is complicated, and primary concern is that dusting caused by burning；
This patent is to carry out rotary drum after coke gasification reaction to detect its powdering amount using detection method, simulates it with drum test and receives in blast furnace
The friction and extruding arrived, test is convenient preferably to go.I type drum test selection rotation 400-800 circle carries out simulation test, is that simulation is burnt
Degradation of the charcoal in blast furnace, avoids kick the beam dusting and excessive dusting, and the powdering amount 10-40% of coke is obtained burnt with air port
The degradation of charcoal is close.
Therefore, the hot powder performance that coke is characterized using dusting index CPR after coke gasification reaction, to overcome tradition
The deficiency of evaluation method makes the evaluation of objective to the reaction mechanism mechanism of reaction of the different quality coke in blast furnace.
The present invention has following good effect compared with prior art: 1, after coke gasification reaction powder performance evaluation method, adopt
With dusting index CPR after coke gasification reaction, fully considered the friction and Extrusion being subjected in blast furnace after coke reactivity, with rotary drum into
Row simulation, can preferably evaluate dusting situation of the coke after blast furnace soft heat vigorous reaction, fill up coke in blast furnace soft heat
The blank of region coke dusting performance characterization.2, had using the permeability of dusting index CPR and blast furnace after coke gasification reaction bright
The performance of aobvious relationship, coke skeleton function exactly reduces coke dusting, the embodiment of coke permeability is improved, for blast furnace blast furnace
Production has directive significance.3, the present invention is to proposing powder performance after coke gasification reaction on the basis of blast-furnace coke deterioration research
Evaluation method overcomes the shortcomings of existing coke evaluation method；The method of the present invention can distinguish the powder performance of different coke, for
The selection of blast furnace smelter coke has directive significance.
Specific embodiment
The present invention is further stated below by specific example.
Embodiment 1, a method of the detection hot powder performance of coke, method includes the following steps:
1) coke specimen is prepared, 5 kinds of coke for selecting certain iron company to use control coke specimen as test specimen
Partial size is 23-25mm；
2) coke specimen is dried, coke specimen is put into baking oven, 2.0h is dried at 110 DEG C, it is cold to take out coke specimen
But spare to 25 DEG C of sealings；
3) STRENGTH ON COKE sample carries out reactive test, and the 200g coke specimen dried is placed in coke gasification reaction system safety testing device
In；In the range of being warming up to 1100 DEG C for 25 DEG C of coke with 5 DEG C/min heating rate, it is passed through into coke gasification reaction system safety testing device
N2, coke constant temperature 2h at 1100 DEG C is passed through CO2；Manipulate computer acquisition and holding time, atmosphere and coke Weight loss data；
4) it is sieved after coke is cooling, weighs the partial size < 10mm coke screened out and obtain m1；
5) partial size >=10mm coke screened out is placed in 600 circle of rotation in I type rotary drum, takes out coke in I type rotary drum,
The coke for weighing particle size < 10mm obtains m2；
6) dusting index CPR after coke gasification reaction is calculated, dusting index CPR is calculated according to formula one after coke gasification reaction, CPR=
(m1+m2)/200*100% formula one, in formula one, m1As described in step 4)；m2As described in step 5).
The quality testing tables of data of 1 embodiment of the present invention of table, 1 coke specimen
| Classification | Coke A | Coke B | Coke C | Coke D | Coke E |
| Coke ash Ad/% | 12.21 | 12.02 | 12.00 | 11.87 | 12.43 |
| Sulfur content in coke Std/% | 0.77 | 0.78 | 0.69 | 0.71 | 0.65 |
| Coke strength M40/ % | 90.24 | 88.17 | 89.15 | 89.18 | 87.68 |
| Coke wear-resistant strength M10/ % | 5.97 | 6.09 | 5.91 | 5.64 | 6.45 |
| Post reaction strength of coke CSR/% | 69.88 | 68.81 | 69.23 | 68.38 | 66.29 |
| Pulverization rate CPR/% after coke gasification reaction | 22.86 | 23.60 | 24.04 | 24.28 | 25.06 |
| Blast furnace pressure difference/kpa | 171.56 | 174.33 | 175.24 | 177.40 | 179.04 |
From table 1 it follows that the present invention provides the Slope map of pixels of powder performance after a kind of reaction of blast-furnace coke, with
CPR improve, blast furnace pressure difference improve, gas permeability be deteriorated.The dusting index CPR of coke A is 22.86%, and blast furnace pressure difference is
171.56kpa；The CPR of coke E is 25.06%, and blast furnace pressure difference is 179.04%, and the gas permeability of blast furnace is deteriorated.Relative to coke
Post reaction strength CSR with then without apparent rule.
The evaluation method of powder performance after coke gasification reaction proposed by the present invention, using dusting index CPR after coke gasification reaction come
The hot powder performance for characterizing coke, so that the deficiency of traditional evaluation method is overcome, to different quality coke in blast furnace
The reaction mechanism mechanism of reaction makes the evaluation of objective.
Described in example as above, heating and control climate in step 3) can choose constant temperature also and can choose non-constant temperature.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (1)
1. a kind of method for detecting the hot powder performance of coke, characterized in that the method the following steps are included:
1) coke specimen is prepared, the partial size for controlling coke specimen is 23-25mm；
2) coke specimen is dried, coke specimen is put into baking oven, 1.5~2.5h is dried at 105~120 DEG C, takes out coke
It is spare that sample is cooled to 15~25 DEG C of sealings；
3) STRENGTH ON COKE sample carries out reactive test, and the 200g coke specimen dried is placed in coke gasification reaction system safety testing device；
The heating-rate curve for manipulating coke gasification reaction system safety testing device setting coke, heated up according to heating-rate curve STRENGTH ON COKE,
Heat preservation, is passed through protective gas into coke gasification reaction system safety testing device；Manipulate computer acquisition and holding time, atmosphere and coke
Weight loss data；
4) it is sieved after coke is cooling, weighs the partial size < 10mm coke screened out and obtain m1；
5) partial size >=10mm coke screened out is placed in I type rotary drum and rotates 400-800 circle, take out coke in I type rotary drum,
It weighs particle size < 10mm coke and obtains m2；
6) dusting index CPR after coke gasification reaction is calculated, dusting index CPR is calculated according to formula one after coke gasification reaction,
CPR=(m1+m2)/200*100% formula one, in formula one, m1As described in step 4)；m2As described in step 5).
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Cited By (4)
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| CN110411852A (en) * | 2019-07-30 | 2019-11-05 | 重庆大学 | The measuring method of coke property alternation in a kind of blast furnace |
| CN111122375A (en) * | 2019-12-30 | 2020-05-08 | 湖北富邦新材料有限公司 | Method for rapidly measuring adhesion of anti-caking agent on surface of granular fertilizer |
| CN111307645A (en) * | 2019-12-30 | 2020-06-19 | 湖北富邦新材料有限公司 | Method for rapidly measuring dust on surface of granular fertilizer |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110411852A (en) * | 2019-07-30 | 2019-11-05 | 重庆大学 | The measuring method of coke property alternation in a kind of blast furnace |
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| CN111307645A (en) * | 2019-12-30 | 2020-06-19 | 湖北富邦新材料有限公司 | Method for rapidly measuring dust on surface of granular fertilizer |
| 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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