CN110411852A - The measuring method of coke property alternation in a kind of blast furnace - Google Patents
The measuring method of coke property alternation in a kind of blast furnace Download PDFInfo
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- CN110411852A CN110411852A CN201910695199.7A CN201910695199A CN110411852A CN 110411852 A CN110411852 A CN 110411852A CN 201910695199 A CN201910695199 A CN 201910695199A CN 110411852 A CN110411852 A CN 110411852A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels, explosives
- G01N33/222—Solid fuels, e.g. coal
Abstract
The invention discloses a kind of measuring methods of coke property alternation in blast furnace, comprising the following steps: step 1: coke is placed in crucible；Step 2: crucible is placed in high temperature furnace, and carries out airtight test to high temperature furnace；Step 3: high temperature furnace is subjected to vacuumize process using vacuum pump；Step 4: in temperature-rise period, the pressure being applied on coke specimen is controlled according to the furnace temperature of high temperature furnace by setting pressure controling mode；The flow of gas componant each in reducing gas is controlled according to the furnace temperature of high temperature furnace by setting flow control mode simultaneously；Step 5: it is passed through nitrogen after heating and is cooled down；Step 6: drum test；Step 7: data acquisition and calculating are carried out.Practical destruction situation of the coke in blast furnace can more be reflected closer to the actual condition of blast furnace by adopting the test result being obtained by the present invention.
Description
Technical field
The present invention relates to metallurgical technology fields, and in particular to the measuring method of coke property alternation in a kind of blast furnace.
Background technique
Coke is the important raw material of steel production enterprise, and heat source, reducing agent, carburizer, stock column skeleton are played in blast furnace
Etc. important function；Therefore performance of the coke in blast furnace directly affects the direct motion of blast furnace and the yield of cast iron product and matter
Amount.
The measurement of performance in blast furnace of current STRENGTH ON COKE is mainly the measurement of coke reactivity and post reaction strength, it is logical
The chemical solution damage for crossing coke under analog blast furnace smelting state evaluates the blast furnace process performance of coke with Focal drug-block.
In the prior art, for the measuring method of coke reactivity and post reaction strength the following steps are included:
Step 1) is placed the coke after drying in the reactor by regulation；
Reactor is placed in high temperature furnace by step 2), and carries out airtight test to high temperature furnace；
Step 3) carries out heating control to high temperature furnace according to setting heating mode；Lead to before high temperature furnace furnace temperature is 1100 DEG C
Enter N2, CO is switched to when furnace temperature is 1100 DEG C2；It carries out cooling after experiment and is passed through N again2It is protected；
Coke after reaction is put into rotary drum and carries out mechanical damage by step 4)；
The acquisition and processing of step 5) data.
It can be seen that by above-mentioned experimental procedure and be measured using existing measuring method in STRENGTH ON COKE smelting performance
When, there are problems that the following aspects: 1, the measuring method only accounts for the behavior of cohesive zone and above section coke, to it
The characterization of global behavior does not have representativeness in blast furnace；2, in the step 3) of the measuring method, only it is passed through CO2Gas STRENGTH ON COKE
Chemical solution damage is carried out, experimental atmosphere is single, and CO2Gas flow is definite value, is unable to the practical atmosphere situation of analog blast furnace；3, whole
During a test, non-STRENGTH ON COKE sample is further applied load, and does not account in practical blast furnace ironmaking process, stock column pressure in blast furnace
The influence that STRENGTH ON COKE generates；4, heating rate does not meet blast furnace reality, becomes with temperature of coke specimen during blast furnace declines
Change situation to have differences.
Summary of the invention
In view of the above shortcomings of the prior art, the technical problem to be solved by the present invention is how to provide a kind of energy mould
Quasi- blast furnace real work atmosphere, and can dynamically adjust the measurement side of coke property alternation in the blast furnace of load on coke specimen
Method.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme:
The measuring method of coke property alternation in a kind of blast furnace, comprising the following steps:
Step 1: it dries, then is placed in crucible after coke is crushed to designated size；
Step 2: crucible is placed in high temperature furnace, and N is continually fed into high temperature furnace2, until in high temperature furnace pressure and
Pressure difference outside high temperature furnace is not less than setting value, that is, thinks that high temperature furnace air-tightness is good；
Step 3: the mixed gas in high temperature furnace burner hearth is extracted out using vacuum pump, is reached to the pressure in high temperature furnace burner hearth
To when setting requirement of experiment, start to warm up；
Step 4: in temperature-rise period, by setting pressure controling mode according to the furnace temperature of high temperature furnace to being applied to coke specimen
On pressure controlled；
N is continually fed into high temperature furnace when the furnace temperature of high temperature furnace is less than 500 DEG C simultaneously2；When the furnace temperature of high temperature furnace is not small
Reducing gas is passed through into high temperature furnace when 500 DEG C, reducing gas includes by N2、CO2, CO and H2The mixed gas of composition, in height
When the furnace temperature of warm furnace is greater than 500 DEG C but is not more than final temperature, by setting flow control mode according to the furnace temperature of high temperature furnace to also Primordial Qi
The flow of each gas componant is controlled in body；The final temperature is greater than 500 DEG C；
Step 5: after heating, N is passed through into high temperature furnace2, in N2To the coke specimen in high temperature furnace under protective atmosphere
It is cooled down, when the furnace temperature of high temperature furnace is less than 100 DEG C, stopping is passed through N2；
Step 6: coke specimen after cooling being placed in rotary drum and carries out drum test, is carried out with specified revolving speed STRENGTH ON COKE
Mechanical damage；
Step 7: data acquisition and calculating are carried out, the measurement of coke property is completed.
It include by N in the reducing gas being passed through in step 4 of the present invention into high temperature furnace2、CO2, CO and H2Composition mixes
Gas is closed, is only passed through CO and N in the mixed gas and existing measuring method2The mode of mixed gas compare, can better mould
The real work atmosphere of quasi- blast furnace；Simultaneously during the test, changed according to the furnace temperature of high temperature furnace to gas each in reducing gas
The flow of ingredient is controlled, so that the dynamic control of reducing gas ingredient and flow is realized, preferably close to the reality of blast furnace
Work atmosphere.
On the other hand, in step 4, the pressure being applied on coke specimen is controlled also according to the furnace temperature of high temperature furnace
System so that the pressure being applied on coke specimen is no longer definite value, but variation with temperature and change, thus further to
In practical smelting process, stock column pressure is with stock column STRENGTH ON COKE sample pressure caused by the difference of coke specimen present position in blast furnace
Variation, closer to practical destruction situation of the coke specimen in blast furnace.
The beneficial effects of the present invention are: one aspect of the present invention is by using N2、CO2, CO and H2The mixed gas of composition is made
It is passed into high temperature furnace for reducing gas, while according to each gas componant and stream in the furnace temperature of high temperature furnace dynamic adjustment reducing gas
Amount enables the high temperature furnace environment in the test method preferably close to the practical smelting environment of blast furnace；On the other hand, according to height
The furnace temperature of warm furnace dynamically adjusts the pressure being applied on coke specimen, preferably to simulate in practical smelting process stock column in blast furnace
Pressure with stock column STRENGTH ON COKE sample pressure caused by the difference of coke specimen present position variation.Therefore method energy mould of the invention
Quasi- blast furnace real work atmosphere, and the load on coke specimen can be dynamically adjusted, so that being obtained using method of the invention
The test result arrived can more reflect practical destruction situation of the coke in blast furnace closer to the actual condition of blast furnace.
Preferably, in step 4:
When the furnace temperature of high temperature furnace is 500 DEG C~1100 DEG C, CO2Flow reduce, the flow of CO with the raising of furnace temperature
Increase, H with the raising of furnace temperature2N2Flow remain unchanged；
When the furnace temperature of high temperature furnace is 1100 DEG C~1400 DEG C, CO2Flow reduce, H with the raising of furnace temperature2Flow
Increase, the N of CO with the raising of furnace temperature2Flow remain unchanged；
When the furnace temperature of high temperature furnace is 1400 DEG C~final temperature, the flow of CO reduces, H with the raising of furnace temperature2Flow with
The raising of furnace temperature and increase, CO2N2Flow remain unchanged.
In this way, segmentation flow control is carried out according to the furnace temperature of high temperature furnace, when the furnace temperature of high temperature furnace is within the scope of different temperatures
When, the uninterrupted of each gas componant is different in reducing gas, by being segmented flow control, so that the reducing gas in high temperature furnace
The atmosphere of generation can more accurately simulate the atmosphere of blast furnace in practical smelting process, and test result is mentioned closer to actual condition
The property of can refer to of high test result.
Preferably, in step 4, when the furnace temperature of high temperature furnace is 500 DEG C~1100 DEG C, CO2Flow by 500 DEG C when
1L/min is linearly reduced to 0.15L/min at 1100 DEG C, the 1.25L/ when flow of CO is by 500 DEG C with the raising of furnace temperature
2.1L/min, H when min linearly increases to 1100 DEG C with the raising of furnace temperature2Flow be 0.25L/min, N2Flow be
2.5L/min；
When the furnace temperature of high temperature furnace is 1100 DEG C~1400 DEG C, CO2Flow by 1100 DEG C when 0.15L/min with furnace temperature
Raising and 0L/min, H when being linearly reduced to 1400 DEG C2Flow by 1100 DEG C when 0.25L/min with furnace temperature raising
The flow of 0.4L/min when linearly increasing to 1400 DEG C, CO are 2.1L/min, N2Flow be 2.5L/min；
When the furnace temperature of high temperature furnace is 1400 DEG C~final temperature, the 2.1L/min when flow of CO is by 1400 DEG C with furnace temperature liter
High and 2L/min, H when being linearly reduced to final temperature2Flow by 1400 DEG C when 0.4L/min linearly increase with the raising of furnace temperature
0.5L/min, CO when to final temperature2Flow be 0L/min, N2Flow be 2.5L/min；
The final temperature is 1600 DEG C.
In this way, the atmosphere for enabling the reducing gas in high temperature furnace to generate more accurately simulates blast furnace in practical smelting process
Atmosphere.
Preferably, in step 4, when the furnace temperature of high temperature furnace is 500 DEG C~900 DEG C, CO2Flow by 500 DEG C when
The 1.25L/min when flow of 0.75L/min, CO when 1L/min is linearly reduced to 900 DEG C with the raising of furnace temperature are by 500 DEG C
With the 1.5L/min of furnace temperature increased when linearly increasing to 900 DEG C；
When the furnace temperature of high temperature furnace is 900 DEG C~1100 DEG C, CO2Flow by 900 DEG C when 0.75L/min with furnace temperature
The 1.5L/min when flow of 0.15L/min, CO when increasing and being linearly reduced to 1100 DEG C are by 900 DEG C with furnace temperature raising line
Property increases to 2.1L/min at 1100 DEG C.
In this way, the atmosphere for enabling the reducing gas in high temperature furnace to generate more accurately simulates blast furnace in practical smelting process
Atmosphere.
Preferably, in step 4, pressure controling mode is set as the furnace temperature according to high temperature furnace and carries out segmentation pressure control:
When the furnace temperature of high temperature furnace is room temperature~200 DEG C, the pressure being applied on coke specimen is 0kPa；
When the furnace temperature of high temperature furnace is 200 DEG C~900 DEG C, be applied to the pressure on coke specimen since 0kPa with
The rate of 1.34kPa/min increases；
When the furnace temperature of high temperature furnace is 900 DEG C~1100 DEG C, the pressure on coke specimen is applied to 0.06kPa/min's
Rate increases；
When the furnace temperature of high temperature furnace is 1100 DEG C~final temperature, the pressure being applied on coke specimen is remained unchanged.
In this way, Discrete control is carried out according to the pressure on the furnace temperature STRENGTH ON COKE sample of high temperature furnace, by Discrete control, so that
The pressure energy on coke specimen is applied to closer to the pressure in the practical smelting process of blast furnace during test.
Preferably, in step 4, heating mode is set are as follows:
When the furnace temperature of high temperature furnace is room temperature~900 DEG C, the heating rate of high temperature furnace is 10 DEG C/min；
When the furnace temperature of high temperature furnace is 900 DEG C~1100 DEG C, the heating rate of high temperature furnace is 2 DEG C/min；
When the furnace temperature of high temperature furnace is 1100 DEG C~1400 DEG C, the heating rate of high temperature furnace is 3 DEG C/min；
When the furnace temperature of high temperature furnace is 1400 DEG C~final temperature, the heating rate of high temperature furnace is 5 DEG C/min；
The final temperature is 1600 DEG C.
In this way, changing the furnace temperature of high temperature furnace closer to the temperature change in practical smelting process.
Preferably, the crucible is boron nitride crucible；
In step 2, after boron nitride crucible is placed in high temperature furnace, N is passed through with the speed of 5L/min into high temperature furnace2,
When the pressure in high temperature furnace and the pressure difference value outside high temperature furnace are not less than 2*104When Pa, that is, think that high temperature furnace burner hearth air-tightness is good
It is good；
In step 3, requirement of experiment is set as vacuumize process will be carried out in high temperature furnace, so that the vacuum degree in high temperature furnace
Reach 8~12Pa.
In this way, ensure that high temperature furnace working environment during entirely testing by the inspection for carrying out air-tightness to system
Sealing performance.
Preferably, in step 5, after heating, N is passed through with the speed of 2L/min into high temperature furnace2, when high temperature furnace
When furnace temperature is less than 100 DEG C, stopping is passed through N2。
Preferably, in step 1, coke specimen 200g ± 0.5g after taking drying is spare, and by the matter of coke specimen at this time
Amount is recorded as m, and the designated size is 23~25mm；
In step 6, before coke specimen after cooling is placed in rotary drum, the quality m of coke specimen at this time is recorded1；So
The coke specimen after reaction is sieved with the round-hole mesh of ф 20mm afterwards, records the quality of coke specimen on round-hole mesh at this time
m2；
In step 6, the specified revolving speed is 20r/min, when rotation a length of 30min；After mechanical damage, ф is first used
The round-hole mesh of 10mm sieves the coke specimen after destruction, obtains on round-hole mesh that coke tries under coke specimen and round-hole mesh
Sample records the quality m of coke specimen on round-hole mesh at this time3, then with the round-hole mesh of ф 5mm to coke specimen under round-hole mesh again
It is sieved, records the quality m of coke specimen under round-hole mesh at this time4。
In this way, providing data support by the record of related data for the calculating of the performance parameter of subsequent coke specimen.
Preferably, include the acquisition and calculating of following data in step 7:
1) the molten damage index of coke calculates:
In formula:
CDI (Coke Dissolution Index) is the molten damage index of coke, and numerical value is indicated with %；
M is the quality of coke specimen before high temperature furnace reacts, and unit is gram；
m1The quality before coke specimen after cooling is placed in rotary drum is reacted for high temperature furnace, unit is gram；
2) hot compressive strength of coke calculates:
In formula:
CTCS (Coke Thermal Compressive Strength) is the hot compressive strength of coke, and numerical value is with %
It indicates；
m2Coke examination before drum test after high temperature furnace reaction, after coke specimen crosses ф 20mm round-hole mesh, on round-hole mesh
Sample quality, unit are gram；
3) Strength co-mputation after the molten damage of coke:
In formula:
CSD10(Coke Strength after Dissolution) is intensity after the molten damage of coke, and numerical value is with % table
Show；
m3After drum test, after coke specimen crosses ф 10mm round-hole mesh, coke specimen quality on round-hole mesh, unit is
Gram；
4) the dusting index of coke calculates:
In formula:
CSD5For the dusting index of coke, numerical value is indicated with %；
m4After drum test, after coke specimen crosses ф 5mm round-hole mesh, coke specimen quality under round-hole mesh, unit is
Gram.
In this way, being mentioned by the performance parameter for calculating available coke specimen for the performance evaluation of blast furnace coke sample
For foundation.Intensity and dusting index take the arithmetic mean of instantaneous value of parallel test after Coke Solution damage index, hot compressive strength, molten damage.
Detailed description of the invention
Fig. 1 is the controlling curve figure of furnace pressure in the specific embodiment of the invention；
Fig. 2 is the controlling curve figure of temperature-rise period in the specific embodiment of the invention；
Fig. 3 is the controlling curve figure of reducing gas flow in the specific embodiment of the invention；
Fig. 4 is repeated experiment result histogram in the specific embodiment of the invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
The measuring method of coke property alternation in a kind of blast furnace, comprising the following steps:
Step 1: it dries, then is placed in crucible after coke is crushed to designated size；
Step 2: crucible is placed in high temperature furnace, and N is continually fed into high temperature furnace2, until in high temperature furnace pressure and
Pressure difference outside high temperature furnace is not less than setting value, that is, thinks that high temperature furnace air-tightness is good；
Step 3: the mixed gas in high temperature furnace burner hearth is extracted out using vacuum pump, is reached to the pressure in high temperature furnace burner hearth
To when setting requirement of experiment, start to warm up；
Step 4: in temperature-rise period, by setting pressure controling mode according to the furnace temperature of high temperature furnace to being applied to coke specimen
On pressure controlled；
N is continually fed into high temperature furnace when the furnace temperature of high temperature furnace is less than 500 DEG C simultaneously2；When the furnace temperature of high temperature furnace is not small
Reducing gas is passed through into high temperature furnace when 500 DEG C, reducing gas includes by N2、CO2, CO and H2The mixed gas of composition, in height
When the furnace temperature of warm furnace is greater than 500 DEG C but is not more than final temperature, by setting flow control mode according to the furnace temperature of high temperature furnace to also Primordial Qi
The flow of each gas componant is controlled in body；The final temperature is greater than 500 DEG C；
Step 5: after heating, N is passed through into high temperature furnace2, in N2To the coke specimen in high temperature furnace under protective atmosphere
It is cooled down, when the furnace temperature of high temperature furnace is less than 100 DEG C, stopping is passed through N2；
Step 6: coke specimen after cooling being placed in rotary drum and carries out drum test, is carried out with specified revolving speed STRENGTH ON COKE
Mechanical damage；In the present embodiment, drum test is using I type rotary drum；
Step 7: data acquisition and calculating are carried out, the measurement of coke property is completed.
It include by N in the reducing gas being passed through in step 4 of the present invention into high temperature furnace2、CO2, CO and H2Composition mixes
Gas is closed, is only passed through CO and N in the mixed gas and existing measuring method2The mode of mixed gas compare, can better mould
The real work atmosphere of quasi- blast furnace；Simultaneously during the test, changed according to the furnace temperature of high temperature furnace to gas each in reducing gas
The flow of ingredient is controlled, so that the dynamic control of reducing gas ingredient and flow is realized, preferably close to the reality of blast furnace
Work atmosphere.
On the other hand, in step 4, the pressure being applied on coke specimen is controlled also according to the furnace temperature of high temperature furnace
System so that the pressure being applied on coke specimen is no longer definite value, but variation with temperature and change, thus further to
In practical smelting process, stock column pressure is with stock column STRENGTH ON COKE sample pressure caused by the difference of coke specimen present position in blast furnace
Variation, closer to practical destruction situation of the coke specimen in blast furnace.
The beneficial effects of the present invention are: one aspect of the present invention is by using N2、CO2, CO and H2The mixed gas of composition is made
It is passed into high temperature furnace for reducing gas, while according to each gas componant and stream in the furnace temperature of high temperature furnace dynamic adjustment reducing gas
Amount enables the high temperature furnace environment in the test method preferably close to the practical smelting environment of blast furnace；On the other hand, according to height
The furnace temperature of warm furnace dynamically adjusts the pressure being applied on coke specimen, preferably to simulate in practical smelting process stock column in blast furnace
Pressure with stock column STRENGTH ON COKE sample pressure caused by the difference of coke specimen present position variation.Therefore method energy mould of the invention
Quasi- blast furnace real work atmosphere, and the load on coke specimen can be dynamically adjusted, so that being obtained using method of the invention
The test result arrived can more reflect practical destruction situation of the coke in blast furnace closer to the actual condition of blast furnace.
In four the present embodiment the step of:
When the furnace temperature of high temperature furnace is 500 DEG C~1100 DEG C, CO2Flow reduce, the flow of CO with the raising of furnace temperature
Increase, H with the raising of furnace temperature2N2Flow remain unchanged；
When the furnace temperature of high temperature furnace is 1100 DEG C~1400 DEG C, CO2Flow reduce, H with the raising of furnace temperature2Flow
Increase, the N of CO with the raising of furnace temperature2Flow remain unchanged；
When the furnace temperature of high temperature furnace is 1400 DEG C~final temperature, the flow of CO reduces, H with the raising of furnace temperature2Flow with
The raising of furnace temperature and increase, CO2N2Flow remain unchanged.
In this way, segmentation flow control is carried out according to the furnace temperature of high temperature furnace, when the furnace temperature of high temperature furnace is within the scope of different temperatures
When, the uninterrupted of each gas componant is different in reducing gas, by being segmented flow control, so that the reducing gas in high temperature furnace
The atmosphere of generation can more accurately simulate the atmosphere of blast furnace in practical smelting process, and test result is mentioned closer to actual condition
The property of can refer to of high test result.
In four the present embodiment the step of, when the furnace temperature of high temperature furnace is 500 DEG C~1100 DEG C, CO2Flow by 500 DEG C
When 0.15L/min of 1L/min when being linearly reduced to 1100 DEG C with the raising of furnace temperature, when the flow of CO is by 500 DEG C
2.1L/min, H when 1.25L/min linearly increases to 1100 DEG C with the raising of furnace temperature2Flow be 0.25L/min, N2Flow
For 2.5L/min；
When the furnace temperature of high temperature furnace is 1100 DEG C~1400 DEG C, CO2Flow by 1100 DEG C when 0.15L/min with furnace temperature
Raising and 0L/min, H when being linearly reduced to 1400 DEG C2Flow by 1100 DEG C when 0.25L/min with furnace temperature raising
The flow of 0.4L/min when linearly increasing to 1400 DEG C, CO are 2.1L/min, N2Flow be 2.5L/min；
When the furnace temperature of high temperature furnace is 1400 DEG C~final temperature, the 2.1L/min when flow of CO is by 1400 DEG C with furnace temperature liter
High and 2L/min, H when being linearly reduced to final temperature2Flow by 1400 DEG C when 0.4L/min linearly increase with the raising of furnace temperature
0.5L/min, CO when to final temperature2Flow be 0L/min, N2Flow be 2.5L/min；
Final temperature is 1600 DEG C.
In this way, the atmosphere for enabling the reducing gas in high temperature furnace to generate more accurately simulates blast furnace in practical smelting process
Atmosphere.
In four the present embodiment the step of, when the furnace temperature of high temperature furnace is 500 DEG C~900 DEG C, CO2Flow by 500 DEG C
When 0.75L/min, CO when being linearly reduced to 900 DEG C with the raising of furnace temperature of 1L/min flow by 500 DEG C when
1.5L/min when 1.25L/min linearly increases to 900 DEG C with the raising of furnace temperature；
When the furnace temperature of high temperature furnace is 900 DEG C~1100 DEG C, CO2Flow by 900 DEG C when 0.75L/min with furnace temperature
The 1.5L/min when flow of 0.15L/min, CO when increasing and being linearly reduced to 1100 DEG C are by 900 DEG C with furnace temperature raising line
Property increases to 2.1L/min at 1100 DEG C.The flow parameter of each gas componant and the relationship of furnace temperature are for example attached in specific reducing gas
Shown in Fig. 3.
In this way, the atmosphere for enabling the reducing gas in high temperature furnace to generate more accurately simulates blast furnace in practical smelting process
Atmosphere.
In the present embodiment step 4, pressure controling mode is set as the furnace temperature according to high temperature furnace and carries out segmentation pressure control
System:
When the furnace temperature of high temperature furnace is room temperature~200 DEG C, the pressure being applied on coke specimen is 0kPa；
When the furnace temperature of high temperature furnace is 200 DEG C~900 DEG C, be applied to the pressure on coke specimen since 0kPa with
The rate of 1.34kPa/min increases；
When the furnace temperature of high temperature furnace is 900 DEG C~1100 DEG C, the pressure on coke specimen is applied to 0.06kPa/min's
Rate increases；
When the furnace temperature of high temperature furnace is 1100 DEG C~final temperature, the pressure being applied on coke specimen is remained unchanged, specifically such as
Shown in attached drawing 1.
In this way, Discrete control is carried out according to the pressure on the furnace temperature STRENGTH ON COKE sample of high temperature furnace, by Discrete control, so that
The pressure energy on coke specimen is applied to closer to the pressure in practical smelting process during test.
In the present embodiment step 4, heating mode is set are as follows:
When the furnace temperature of high temperature furnace is room temperature~900 DEG C, the heating rate of high temperature furnace is 10 DEG C/min；
When the furnace temperature of high temperature furnace is 900 DEG C~1100 DEG C, the heating rate of high temperature furnace is 2 DEG C/min；
When the furnace temperature of high temperature furnace is 1100 DEG C~1400 DEG C, the heating rate of high temperature furnace is 3 DEG C/min；
When the furnace temperature of high temperature furnace is 1400 DEG C~final temperature, the heating rate of high temperature furnace is 5 DEG C/min；
Final temperature is 1600 DEG C, and specific heating mode is as shown in Fig. 2.
In this way, changing the furnace temperature of high temperature furnace closer to the temperature change in practical smelting process.
In the present embodiment, crucible is boron nitride crucible；
In step 2, after boron nitride crucible is placed in high temperature furnace, N is passed through with the speed of 5L/min into high temperature furnace2,
When the pressure in high temperature furnace and the pressure difference value outside high temperature furnace are not less than 2*104When Pa, that is, think that high temperature furnace burner hearth air-tightness is good
It is good；
In step 3, requirement of experiment is set as vacuumize process will be carried out in high temperature furnace, so that the vacuum degree in high temperature furnace
Reach 8~12Pa.
In this way, ensure that high temperature furnace working environment during entirely testing by the inspection for carrying out air-tightness to system
Sealing performance.
In the present embodiment step 5, after heating, N is passed through with the speed of 2L/min into high temperature furnace2, work as high temperature furnace
Furnace temperature less than 100 DEG C when, stopping be passed through N2。
In the present embodiment step 1, coke specimen 200g ± 0.5g after taking drying is spare, and will coke specimen at this time
Quality record be m, the designated size be 23~25mm；
In step 6, before coke specimen after cooling is placed in rotary drum, the quality m of coke specimen at this time is recorded1；So
The coke specimen after reaction is sieved with the round-hole mesh of ф 20mm afterwards, records the quality of coke specimen on round-hole mesh at this time
m2；
In step 6, the specified revolving speed is 20r/min, when rotation a length of 30min；After mechanical damage, ф is first used
The round-hole mesh of 10mm sieves the coke specimen after destruction, obtains on round-hole mesh that coke tries under coke specimen and round-hole mesh
Sample records the quality m of coke specimen on round-hole mesh at this time3, then with the round-hole mesh of ф 5mm to coke specimen under round-hole mesh again
It is sieved, records the quality m of coke specimen under round-hole mesh at this time4。
In this way, providing data support by the record of related data for the calculating of the performance parameter of subsequent coke specimen.
In seven the present embodiment the step of, main includes the acquisition and calculating of following data:
1) the molten damage index of coke calculates:
In formula:
CDI (Coke Dissolution Index) is the molten damage index of coke, and numerical value is indicated with %；
M is the quality of coke specimen before high temperature furnace reacts, and unit is gram；
m1The quality before coke specimen after cooling is placed in rotary drum is reacted for high temperature furnace, unit is gram；
2) hot compressive strength of coke calculates:
In formula:
CTCS (Coke Thermal Compressive Strength) is the hot compressive strength of coke, and numerical value is with %
It indicates；
m2Coke examination before drum test after high temperature furnace reaction, after coke specimen crosses ф 20mm round-hole mesh, on round-hole mesh
Sample quality, unit are gram；
3) Strength co-mputation after the molten damage of coke:
In formula:
CSD10(Coke Strength after Dissolution) is intensity after the molten damage of coke, and numerical value is with % table
Show；
m3After drum test, after coke specimen crosses ф 10mm round-hole mesh, coke specimen quality on round-hole mesh, unit is
Gram；
4) the dusting index of coke calculates:
In formula:
CSD5For the dusting index of coke, numerical value is indicated with %；
m4After drum test, after coke specimen crosses ф 5mm round-hole mesh, coke specimen quality under round-hole mesh, unit is
Gram.
In this way, being mentioned by the performance parameter for calculating available coke specimen for the performance evaluation of blast furnace coke sample
For foundation.Intensity and dusting index take the arithmetic mean of instantaneous value of parallel test after Coke Solution damage index, hot compressive strength, molten damage.
This carries out two groups of embodiment experiments altogether, and experimental conditions are as follows.
Certain iron and steel enterprise's industrial production coke is selected, Industrial Analysis and reactivity, post reaction strength are as shown in table 1,
(1#) is with the repeated experiment result of (2#) for the second time as shown in table 2 and attached drawing 4 for the first time.
1 proximate analysis of coke of table and reactivity and post reaction strength
Wherein: MadFor the mass fraction of air-dried basis coke sample moisture, numerical value is indicated with %；
VadFor the mass fraction of air-dried basis coke sample volatile matter, numerical value is indicated with %；
AadFor the mass fraction of air-dried basis coke sample ash content, numerical value is indicated with %；
FCadFor the mass fraction of air-dried basis coke sample fixed carbon, numerical value is indicated with %；
CRI is the reactivity indexes of coke, and numerical value is indicated with %；
CSR is the post reaction strength of coke, and numerical value is indicated with %.
2 embodiment experimental result of table
From table 2 and attached drawing 4 as can be seen that the error of each parameter is respectively less than after being tested twice respectively for same sample
4%, illustrate that the coke property parameter stability measured according to the method for the present invention, experimental repeatability are good.In addition, being surveyed using this method
Fixed Coke Solution damage index (7.52%) is much smaller than the coke reactivity index (24.56%) of National Standard Method measurement, and using we
Intensity (77.96%) is greater than the post reaction strength of coke (66.75%) of National Standard Method measurement after the Coke Solution damage of method measurement.
Finally, it should be noted that technical side the above examples are only used to illustrate the technical scheme of the present invention and are not limiting
Case, those skilled in the art should understand that, modification or equivalent replacement of the technical solution of the present invention are made for those, and
The objective and range for not departing from the technical program, are intended to be within the scope of the claims of the invention.
Claims (10)
1. the measuring method of coke property alternation in a kind of blast furnace, which comprises the following steps:
Step 1: it dries, then is placed in crucible after coke is crushed to designated size；
Step 2: crucible is placed in high temperature furnace, and N is continually fed into high temperature furnace2, until the pressure and high temperature in high temperature furnace
Pressure difference outside furnace is not less than setting value, that is, thinks that high temperature furnace air-tightness is good；
Step 3: the mixed gas in high temperature furnace burner hearth is extracted out using vacuum pump, reaches to the pressure in high temperature furnace burner hearth and sets
When determining requirement of experiment, start to warm up；
Step 4: in temperature-rise period, by setting pressure controling mode according to the furnace temperature of high temperature furnace to being applied on coke specimen
Pressure is controlled；
N is continually fed into high temperature furnace when the furnace temperature of high temperature furnace is less than 500 DEG C simultaneously2；When the furnace temperature of high temperature furnace is not less than 500
DEG C when reducing gas is passed through into high temperature furnace, reducing gas includes by N2、CO2, CO and H2The mixed gas of composition, in high temperature furnace
Furnace temperature be greater than 500 DEG C but be not more than final temperature when, by setting flow control mode according to the furnace temperature of high temperature furnace in reducing gas
The flow of each gas componant is controlled；The final temperature is greater than 500 DEG C；
Step 5: after heating, N is passed through into high temperature furnace2, in N2The coke specimen in high temperature furnace is carried out under protective atmosphere
Cooling, when the furnace temperature of high temperature furnace is less than 100 DEG C, stopping is passed through N2；
Step 6: coke specimen after cooling being placed in rotary drum and carries out drum test, is carried out with specified revolving speed STRENGTH ON COKE mechanical
It destroys；
Step 7: data acquisition and calculating are carried out, the measurement of coke property is completed.
2. the measuring method of coke property alternation in blast furnace according to claim 1, which is characterized in that in step 4:
When the furnace temperature of high temperature furnace is 500 DEG C~1100 DEG C, CO2Flow reduce with the raising of furnace temperature, the flow of CO is with furnace temperature
Raising and increase, H2And N2Flow remain unchanged；
When the furnace temperature of high temperature furnace is 1100 DEG C~1400 DEG C, CO2Flow reduce, H with the raising of furnace temperature2Flow with furnace
Temperature raising and increase, CO and N2Flow remain unchanged；
When the furnace temperature of high temperature furnace is 1400 DEG C~final temperature, the flow of CO reduces, H with the raising of furnace temperature2Flow with furnace temperature
It increases and increases, CO2And N2Flow remain unchanged.
3. the measuring method of coke property alternation in blast furnace according to claim 2, which is characterized in that in step 4, when
When the furnace temperature of high temperature furnace is 500 DEG C~1100 DEG C, CO2Flow by 500 DEG C when 1L/min linearly subtract with the raising of furnace temperature
The 1.25L/min when flow of 0.15L/min at small to 1100 DEG C, CO are by 500 DEG C is linearly increased to the raising of furnace temperature
2.1L/min at 1100 DEG C, H2Flow be 0.25L/min, N2Flow be 2.5L/min；
When the furnace temperature of high temperature furnace is 1100 DEG C~1400 DEG C, CO2Flow by 1100 DEG C when 0.15L/min with furnace temperature liter
High and 0L/min, H when being linearly reduced to 1400 DEG C2Flow by 1100 DEG C when 0.25L/min it is linear with the raising of furnace temperature
The flow of 0.4L/min when increasing to 1400 DEG C, CO are 2.1L/min, N2Flow be 2.5L/min；
When the furnace temperature of high temperature furnace is 1400 DEG C~final temperature, the 2.1L/min when flow of CO is by 1400 DEG C with furnace temperature raising line
Property is reduced to 2L/min, H when final temperature2Flow by 1400 DEG C when 0.4L/min linearly increase to final temperature with the raising of furnace temperature
When 0.5L/min, CO2Flow be 0L/min, N2Flow be 2.5L/min；
The final temperature is 1600 DEG C.
4. the measuring method of coke property alternation in blast furnace according to claim 3, which is characterized in that in step 4, when
When the furnace temperature of high temperature furnace is 500 DEG C~900 DEG C, CO2Flow by 500 DEG C when 1L/min linearly reduce with the raising of furnace temperature
The 1.25L/min when flow of 0.75L/min, CO when to 900 DEG C are by 500 DEG C linearly increases to 900 with the raising of furnace temperature
DEG C when 1.5L/min；
When the furnace temperature of high temperature furnace is 900 DEG C~1100 DEG C, CO2Flow by 900 DEG C when 0.75L/min with furnace temperature raising
And the flow of 0.15L/min, CO when being linearly reduced to 1100 DEG C by 900 DEG C when 1.5L/min linearly increase with the raising of furnace temperature
2.1L/min when greatly to 1100 DEG C.
5. the measuring method of coke property alternation in blast furnace according to claim 1, which is characterized in that in step 4, if
Constant-pressure control mode is that segmentation pressure control is carried out according to the furnace temperature of high temperature furnace:
When the furnace temperature of high temperature furnace is room temperature~200 DEG C, the pressure being applied on coke specimen is 0kPa；
When the furnace temperature of high temperature furnace is 200 DEG C~900 DEG C, the pressure on coke specimen is applied to since 0kPa with 1.34kPa/
The rate of min increases；
When the furnace temperature of high temperature furnace is 900 DEG C~1100 DEG C, the pressure on coke specimen is applied to the rate of 0.06kPa/min
Increase；
When the furnace temperature of high temperature furnace is 1100 DEG C~final temperature, the pressure being applied on coke specimen is remained unchanged.
6. the measuring method of coke property alternation in blast furnace according to claim 1, which is characterized in that in step 4, press
Setting heating mode heats up to high temperature furnace, the setting heating mode are as follows:
When the furnace temperature of high temperature furnace is room temperature~900 DEG C, the heating rate of high temperature furnace is 10 DEG C/min；
When the furnace temperature of high temperature furnace is 900 DEG C~1100 DEG C, the heating rate of high temperature furnace is 2 DEG C/min；
When the furnace temperature of high temperature furnace is 1100 DEG C~1400 DEG C, the heating rate of high temperature furnace is 3 DEG C/min；
When the furnace temperature of high temperature furnace is 1400 DEG C~final temperature, the heating rate of high temperature furnace is 5 DEG C/min；
The final temperature is 1600 DEG C.
7. the measuring method of coke property alternation in blast furnace according to claim 1, which is characterized in that the crucible is nitrogen
Change boron crucible；
In step 2, after boron nitride crucible is placed in high temperature furnace, N is passed through with the speed of 5L/min into high temperature furnace2, work as height
The pressure difference value outside pressure and high temperature furnace in warm furnace is not less than 2*104When Pa, that is, think that high temperature furnace burner hearth air-tightness is good；
In step 3, requirement of experiment is set as vacuumize process will be carried out in high temperature furnace, so that the vacuum degree in high temperature furnace reaches
8~12Pa.
8. the measuring method of coke property alternation in blast furnace according to claim 1, which is characterized in that in step 5, rise
After temperature, N is passed through with the speed of 2L/min into high temperature furnace2, when the furnace temperature of high temperature furnace is less than 100 DEG C, stopping is passed through N2。
9. the measuring method of coke property alternation in blast furnace according to claim 1, it is characterised in that:
In step 1, coke specimen 200g ± 0.5g after taking drying is spare, and is m by the quality record of coke specimen at this time,
The designated size is 23~25mm；
In step 6, before coke specimen after cooling is placed in rotary drum, the quality m of coke specimen at this time is recorded1；Then it uses
The round-hole mesh of ф 20mm sieves the coke specimen after reaction, records the quality m of coke specimen on round-hole mesh at this time2；
In step 6, the specified revolving speed is 20r/min, when rotation a length of 30min；After mechanical damage, ф 10mm is first used
Round-hole mesh the coke specimen after destruction is sieved, obtain on round-hole mesh coke specimen, note under coke specimen and round-hole mesh
Under record at this time on round-hole mesh coke specimen quality m3, then with the round-hole mesh of ф 5mm coke specimen under round-hole mesh is carried out again
Screening, records the quality m of coke specimen under round-hole mesh at this time4。
10. the measuring method of coke property alternation in blast furnace according to claim 9, which is characterized in that wrapped in step 7
Include the acquisition and calculating of following data:
1) the molten damage index of coke calculates:
In formula:
CDI is the molten damage index of coke, and numerical value is indicated with %；
M is the quality of coke specimen before high temperature furnace reacts, and unit is gram；
m1The quality before coke specimen after cooling is placed in rotary drum is reacted for high temperature furnace, unit is gram；
2) hot compressive strength of coke calculates:
In formula:
CTCS is the hot compressive strength of coke, and numerical value is indicated with %；
m2Coke specimen matter before drum test after high temperature furnace reaction, after coke specimen crosses ф 20mm round-hole mesh, on round-hole mesh
Amount, unit are gram；
3) Strength co-mputation after the molten damage of coke:
In formula:
CSD10For intensity after the molten damage of coke, numerical value is indicated with %；
m3After drum test, after coke specimen crosses ф 10mm round-hole mesh, coke specimen quality on round-hole mesh, unit is gram；
4) the dusting index of coke calculates:
In formula:
CSD5For the dusting index of coke, numerical value is indicated with %；
m4After drum test, after coke specimen crosses ф 5mm round-hole mesh, coke specimen quality under round-hole mesh, unit is gram.
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| CN112903513A (en) * | 2021-01-13 | 2021-06-04 | 东北大学 | Method for measuring high-temperature pulverization performance of iron coke |
| CN113640173A (en) * | 2021-09-15 | 2021-11-12 | 鞍钢股份有限公司 | Coke degradation evaluation method under simulated blast furnace dynamic reaction |
| CN113970501A (en) * | 2020-07-23 | 2022-01-25 | 宝山钢铁股份有限公司 | Method for evaluating reaction performance of carbon-iron composite furnace charge |
| CN114486612A (en) * | 2021-12-31 | 2022-05-13 | 鞍钢集团北京研究院有限公司 | Device and method for measuring coke performance |
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| CN113640173A (en) * | 2021-09-15 | 2021-11-12 | 鞍钢股份有限公司 | Coke degradation evaluation method under simulated blast furnace dynamic reaction |
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