CN103940697B - A kind of blast-furnace coke reactivity method of testing - Google Patents
A kind of blast-furnace coke reactivity method of testing Download PDFInfo
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Abstract
The invention provides a kind of blast-furnace coke reactivity method of testing, utilize existing equipment, the carbon's solution loss reaction initial temperature of weight-loss ratio change and coke by obtaining coke under different temperatures, and then characterize the reactivity of coke. Method includes grinding to form the coke specimen of selected test thin post-drying and takes out coke specimen to be cooled to Room-temperature seal standby; Weigh standby coke specimen to be placed in assay device to carry out continuous warming and pass into reacting gas CO2, after arriving intensification terminal, computer data acquiring completes, and preserves and gathers data; Finally process the data that computer gathers; The carbon's solution loss reaction initial temperature of weight-loss ratio change and coke by obtaining coke under different temperatures, and then characterize the reactivity of coke. By the method for the invention, use the testing equipments such as thermobalance, it is possible to analyze all sidedly coke at different temperatures with CO2Response situation, makes the evaluation of objective to the reactivity of different quality coke.
Description
Technical field
The present invention relates to a kind of test reactive new method of blast-furnace coke, also can measure carbonaceous material in other iron-smelting raw materials reactive simultaneously, belong to blast furnace ironmaking field.
Background technology
Coke plays thermal source, reducing agent, skeleton and molten iron carburizing four effect in blast furnace. In recent years, for reducing coke consumption, increase furnace processor, improve iron quality, have employed at tuyere injection coal dust, the reinforcement techniques such as oxygen-enriched air blast, coke, as the effect of thermal source, reducing agent and carburizing, can partly be replaced to a certain extent, but the loose skeleton function as blast furnace stock column can not be replaced, and maximize and strengthening smelting with blast furnace, this effect is more prominent.
The reactivity (CRI) of coke refer to coke at high temperature with CO2Reaction formed CO() ability. Coke with CO2Occurring the air vent wall within coke to be made thinning in Boudouard course of reaction, thus reducing the intensity of coke, accelerate coke damaged, blast furnace ironmaking process is produced following adverse effect: the direct-reduction development of ferrum, coal gas utilizes and degenerates, and coke ratio raises; The coke powder that coke breakage simultaneously produces is degrading the breathability of blast furnace stock column, affects smooth operation of furnace. When coke enters the region of more than 850 DEG C, carbon therein begins to and the CO in coal gas2Reaction forms CO; And when entering 1000 DEG C of area above of temperature, thrombolytic agents sharply carries out; During to 1200 DEG C, the CO in coal gas2All will react with C in coke moment and be changed into CO.
According to research and generate practice as a result, it is possible to say that coke quality has become as the deciding factor building the how many deciding factor of the deciding factor of furnace volume size, total coal powder and cupola well state. In order to evaluate the damaged influence degree of the molten loss rate STRENGTH ON COKE of carbon, improve coke quality, improve Coal Blending Technology and provide technical parameter for blast furnace operating, first Japan have developed the detection technique of coke reactivity, hereafter some countries imitate in succession, have successively formulated detection method and the standard of coke reactivity.
The method of Present Domestic detection coke reactivity has national standard (GB/T4000-2008), patent CN101825548A, patent CN102928455A etc., and the principle adopted is all the logical CO of high temperature process furnances2Gas heats, test amount of coke used is big, experimental facilities complicated operation, especially patent CN101825548A and patent CN102928455A improves experimental facilities, if it is commonly used, equipment investment or repacking cost are big, so the still GB/T4000-2008 GB (coke reactivity and post reaction strength test method) that present domestic ironmaking worker is commonly used. This national regulations coke at 1100 DEG C with CO2The ability of gas reaction, the i.e. reactive important quality index with post reaction strength as sign high temperature metallurgical properties of coke. But being as going deep into of research, these two indexs itself are also also perfect, there is also some defects. First, boudouard reaction just has begun to when 800 DEG C to have data to show, thrombolytic agents is to occur in certain temperature range, and standard regulation carries out temperature using 1100 DEG C as test and has some limitations; Second, even if under the same reaction conditions, different coke and CO2Reaction rate when reaction also differs, standard unified response time and the actual deviation that there is also, and the present invention can avoid the deviation that reaction rate difference causes; 3rd, traditional detection method coke specimen consumption mostly is 200g, and the present invention once experiment amount of coke is only 17 ~ 18mg, and experimental sample makes consumption decrease more than 99%, is greatly saved the energy within the specific limits.
Summary of the invention
The invention provides the reactive new methods of carbonaceous material such as a kind of detection blast-furnace coke, under the guidance of traditional test coke reactivity principle, utilize existing equipment, the carbon's solution loss reaction initial temperature of weight-loss ratio change and coke by obtaining coke under different temperatures, and then characterize the reactivity of coke.
The method of detection coke reactivity provided by the invention includes herein below:
(1) coke specimen of selected test is ground to form fine powder standby;
(2) putting in baking oven by the sample made, dry 2 hours at 105 ~ 120 DEG C, it is standby that taking-up coke specimen is cooled to Room-temperature seal;
(3) assay device require can be warming up to 1200 DEG C under specific atmosphere, and in temperature-rise period METHOD FOR CONTINUOUS DETERMINATION sample weight loss at different temperatures;
(4) weigh standby coke specimen 17 ~ 18mg, be placed in assay device, carry out continuous warming with the heating rate of 20 DEG C/min, pass into reacting gas CO simultaneously2, gas flow controls at 60ml/min;
(5) calefactive interzone set is from room temperature to 1200 DEG C;
(6) after arriving intensification terminal, computer data acquiring completes, and preserves and gathers data;
(7) when device burner hearth to be tested is cooled to room temperature, can be taken off sample, carry out next group experiment;
(8) Boudouard reaction carries out in temperature-rise period, and the data that finally process computer gathers can obtain the TG-DTA curve that coke reacts under continuous warming environment;
(9) by the comparison to TG curvilinear trend and weight-loss ratio, it is possible to obtain the weight-loss ratio change of coke under different temperatures and the carbon's solution loss reaction initial temperature of coke, and then characterize the reactivity of coke.
Further, the coke specimen powder after grinding described in described step (1) crosses 200 mesh sieves, and extracting screen underflow is standby.
Further, described assay device is microcomputer differential thermal balance, selects Thermal Synthetic Analysis instrument, synchronous solving, thermogravimetric analyzer or thermobalance.
Further, described method can be used for testing coke reactivity, or tests the reactivity of other carbonaceous materials; Other carbonaceous materials described are coal, semi-coke, carbonaceous pelletizing or biomass char etc.
It is an advantage of the current invention that the deviation that reaction rate difference can be avoided to cause, obtain the weight-loss ratio change of coke under different temperatures and the carbon's solution loss reaction initial temperature of coke, and then characterize the reactivity of coke. Can analyze all sidedly coke at different temperatures with CO2Response situation, makes the evaluation of objective to the reactivity of different quality coke. Additionally, the present invention once experiment amount of coke is only 17 ~ 18mg, experimental sample makes consumption decrease more than 99.9, is greatly saved the energy within the specific limits.
Accompanying drawing explanation
Fig. 1 (a) is the weight-loss curve schematic diagram of the 1,2nd and 3 kind of coke;
Fig. 1 (b) is the weight-loss curve schematic diagram of the 4,5th and 6 kind of coke;
Fig. 2 is 600 DEG C of carbon's solution loss reaction weight loss schematic diagrams of each coke;
Fig. 3 is 800 DEG C of carbon's solution loss reaction weight loss schematic diagrams of each coke;
Fig. 4 is 900 DEG C of carbon's solution loss reaction weight loss schematic diagrams of each coke;
Fig. 5 is each coke reaction starting temperature schematic diagram;
Fig. 6 is 1000 DEG C of carbon's solution loss reaction weight loss schematic diagrams of each coke;
Fig. 7 is 1100 DEG C of carbon's solution loss reaction weight loss schematic diagrams of each coke;
Fig. 8 is 1200 DEG C of carbon's solution loss reaction weight loss schematic diagrams of each coke.
Detailed description of the invention
Below by instantiation, the present invention is further stated.
Select 6 kinds of coke that certain iron company uses as test specimen, cross 200 mesh sieves after being ground, take minus sieve powder standby;
Standby powder is put in baking oven, dries 2 hours at 105 ~ 120 DEG C, be cooled to Room-temperature seal after taking-up standby;
Assay device selects the microcomputer differential thermal balance that Beijing company manufactures;
Weigh the standby 6 kind each 17mg of coke specimen, be sequentially placed in differential thermal balance, carry out continuous warming with the heating rate of 20 DEG C/min, pass into reacting gas CO simultaneously2, gas flow controls at 60ml/min;
The calefactive interzone set is from room temperature to 1200 DEG C;
After arriving intensification terminal, computer data acquiring completes, and preserves and gathers data;
When differential thermal balance burner hearth is cooled to room temperature, can be taken off sample, carry out the experiment of next sample;
Boudouard reaction carries out in temperature-rise period, the data that finally process computer gathers can obtain the TG-DTA curve that coke reacts under continuous warming environment, processed by data, it is possible to obtain the weight-loss curve of 6 kinds of coke, as shown in Fig. 1 (a) and (b). By Fig. 1 (a) with (b) it can be seen that 6 kinds of coke are at initial reaction stage (< 900 DEG C), its weight-loss curve can be divided three classes:
1. weightlessness: 1# and 4# it is substantially free of;
2. a small amount of weightless: 2# and 5#;
3. notable weightless: 3# and 6#.
The weight-loss ratio of each coke when Fig. 2 ~ 4 are 600 DEG C, 800 DEG C and 900 DEG C, when 600 DEG C, the weight-loss ratio of 1#, 4# coke is both less than 0.5%, and the weight-loss ratio of 2#, 5# coke is between 2% to 3%, and the weight-loss ratio of 3#, 6# coke is all more than 4%.
And when 900 DEG C, the weight-loss ratio of 1# and 4# coke is also less than 2%, the weight-loss ratio of 2# and 5# is between 4 ~ 6%, and the weight-loss ratio of 3# and 6# coke is all more than 7%, and wherein the weight-loss ratio of 3# coke alreadys more than 10%.
As can be seen here, will there is thrombolytic agents at middle low-temperature space in coke, and the thrombolytic agents rate of each coke is not quite similar, and wherein 3#, 6# coke is higher in the reactivity of middle low-temperature space.
The intersection point of low-temp reaction speed line and the tangent line of pyroreaction speed line is defined as the starting temperature of coke vigorous reaction, namely coke reaction starting temperature it is called, Fig. 5 is the reaction starting temperature comparison diagram of 6 kinds of coke, as seen from the figure, the violent reaction starting temperature of above-mentioned coke is above 1010 DEG C, wherein the reaction starting temperature of 2# coke is minimum is 1018 DEG C, the reaction starting temperature of 6# coke is up to 1066 DEG C, 48 DEG C have been postponed than 2# coke, the Different Effects of coke reaction starting temperature the position of blast furnace flat-temperature zone, the coke that reaction starting temperature gap is bigger fits into stove can increase the height of flat-temperature zone. 6 kinds of coke reaction starting temperature order from low to high is: 2# < 3# < 4# < 1# < 5# < 6#.
Fig. 6 ~ 8 are the weight-loss ratio curve chart at 1000 DEG C, 1100 DEG C and 1200 DEG C respectively, and when 1000 DEG C, the weight-loss ratio of all coke is below 20%, and wherein the weight-loss ratio of 1# and 4# coke is less than 8%; During to 1100 DEG C, the weight-loss ratio of all coke is all more than 20%, and wherein 3# coke alreadys more than 40%, the weight-loss ratio increase of 1# and 4# coke quickly, more than 20%; When arriving 1200 DEG C, the weight-loss ratio of all coke all reaches more than 40%, and wherein 3# has reached 85.58%, is about to react completely, and 4# only has 49.22%, reacts also not more than half.
As above described in example, coke reactivity can be characterized meticulously by a kind of new blast-furnace coke reactivity method of testing provided by the invention comprehensively, also can measure different coke melting loss simultaneously and react coke weight-loss ratio change under the initial temperature and different temperatures occurred. While effectively characterizing coke reactivity, also largely save test and consumed amount of coke.
Claims (6)
1. a blast-furnace coke reactivity method of testing, it is characterised in that: the method includes herein below:
(1) coke specimen of selected test is ground to form fine powder standby;
(2) putting in baking oven by the sample made, dry 2 hours at 105 ~ 120 DEG C, it is standby that taking-up coke specimen is cooled to Room-temperature seal;
(3) assay device require can be warming up to 1200 DEG C under specific atmosphere, and in temperature-rise period METHOD FOR CONTINUOUS DETERMINATION sample weight loss at different temperatures;
(4) weigh standby coke specimen 17 ~ 18mg, be placed in assay device, carry out continuous warming with the heating rate of 20 DEG C/min, pass into reacting gas CO simultaneously2, gas flow controls at 60ml/min;
(5) calefactive interzone set is from room temperature to 1200 DEG C;
(6) after arriving intensification terminal, computer data acquiring completes, and preserves and gathers data;
(7) when device burner hearth to be tested is cooled to room temperature, can be taken off sample, carry out next group experiment;
(8) Boudouard reaction carries out in temperature-rise period, and the data that finally process computer gathers can obtain the TG-DTA curve that coke reacts under continuous warming environment;
(9) by the comparison to TG curvilinear trend and weight-loss ratio, it is possible to obtain the weight-loss ratio change of coke under different temperatures and the carbon's solution loss reaction initial temperature of coke, and then characterize the reactivity of coke.
2. the blast-furnace coke reactivity method of testing described in claim 1, it is characterised in that: the coke specimen powder after grinding described in described step (1) crosses 200 mesh sieves, and extracting screen underflow is standby.
3. blast-furnace coke reactivity method of testing according to claim 1, it is characterised in that: described assay device is microcomputer differential thermal balance, Thermal Synthetic Analysis instrument, synchronous solving or thermogravimetric analyzer.
4. blast-furnace coke reactivity method of testing according to claim 1, it is characterised in that: described method can be used for testing coke reactivity, or tests the reactivity of other carbonaceous materials.
5. blast-furnace coke reactivity method of testing according to claim 4, it is characterised in that: other carbonaceous materials described are coal, semi-coke, carbonaceous pelletizing or biomass char.
6. blast-furnace coke reactivity method of testing according to claim 1, it is characterised in that: described assay device is thermobalance.
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| NO174824B (en) * | 1992-02-28 | 1994-04-05 | Norsk Hydro As | Method for determining reactivity and soot index in carbon products, and equipment therefor |
| CN101710054B (en) * | 2009-12-09 | 2011-06-22 | 莱芜钢铁股份有限公司 | Measurement method and measurement device of coke reactivity |
| CN102928454B (en) * | 2012-10-23 | 2016-01-20 | 鞍钢股份有限公司 | Detection method and detection device for hot state performance of iron coke |
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