CN102183477A

CN102183477A - Method for simulation test of influence of alkali metal on coke degradation

Info

Publication number: CN102183477A
Application number: CN 201010602474
Authority: CN
Inventors: 贾国利; 张海滨; 马金芳; 万雷; 程树森; 赵宏博; 贾军民; 焦月生; 徐士成
Original assignee: Shougang Corp; Hebei Shougang Qianan Iron and Steel Co Ltd
Current assignee: Beijing Shougang Co Ltd
Priority date: 2010-12-13
Filing date: 2010-12-13
Publication date: 2011-09-14
Anticipated expiration: 2030-12-13
Also published as: CN102183477B

Abstract

A method for a simulation test of the influence of alkali metal on coke degradation belongs to the field of blast furnace ironmaking technology. Aactive carbon powder and alkali carbonate powder are mixed and added into a corundum crucible; the crucible is placed on the upper part of a high-alumina ball at the bottom of a high temperature reaction vessel; a porous permeable corundum gasket is placed on the corundum crucible; three high temperature resistant corundum branch pipes with a height of 30-60 mm are placed on the gasket; a permeable gasket is placed above the corundum branch pipes; a coke sample is placed on the permeable gasket; after the sample is in place, the sample is heated and argon is pumped in to discharge air in the reaction vessel; when the temperature in the reaction vessel reaches 1200 DEG C, alkali metal vapor is generated; the sample is cooled to room temperature with the protection of argon, and the coke adsorbed with alkali vapor is inspected and analyzed. The advantages are that: the problem is solved that simulation tests of the adsorption of alkali metal elementary vapor on coke during the vapor rising process at 1100-1300 DEG C and the influence of CO2 on coke degradation can not be performed, and an evaluation index for evaluating the alkali metal harm resistance of coke at high temperature is provided.

Description

A kind of method of simulation test alkaline metal STRENGTH ON COKE deterioration influence

Technical field

The invention belongs to technical field of blast furnace ironmaking, the method that particularly relates to a kind of simulation test alkaline metal STRENGTH ON COKE deterioration influence, absorption in the simulation test blast furnace alkali rich region alkaline metal simple substance steam uphill process on coke and the influence of STRENGTH ON COKE deterioration, its result also can be used as the newly-increased quality evaluation index of blast furnace coke.

Background technology

Along with the raising of modern large blast furnace rate of driving, the increase of coal powder injection ratio and the deterioration of ore, coke is more outstanding as the skeleton function of blast furnace stock column, but coke in the blast furnace stroke since its intensity such as physical disturbance, thermal stress, melting loss reaction and granularity all descending, when coke degradation is serious, will directly cause permeability of stock column decline and coal gas distributions unbalance, destroy the direct motion high yield of blast furnace.In numerous factors of aggravation coke degradation, the destruction of the alkaline metal STRENGTH ON COKE of blast furnace circulating enrichment draws attention, as coke as described in the document 1 as alkali-metal important carrier alkali enriching quantity even can reach more than 20 times of original alkali content (iron and steel, 1982,17 (10): 25-77) in the coke.Forefathers are in order to study the influence of alkaline metal STRENGTH ON COKE intensity, as document 2 (coal conversion, 2008,31 (3): 43-47.) with document 3 (ironmaking, 1990,5:19-22.) describedly carry out 1100 ℃ of molten damage reaction tests of coke again after coke being immersed in alkali metal carbonate solution (" caustic dip method ") or adding alkali carbonate (" increasing alkaline process ") when the coking, but circulation enrichment research in stove as can be known according to blast furnace dissection investigation and alkaline metal, alkali enrichment and deterioration thereof are just the most serious in blast furnace melting with soft (1100 ℃-1300 ℃) coke, and calculation of thermodynamics proves that alkaline metal exists and noncarbonate with simple substance steam form in this high-temperature area, and the method for 1100 ℃ of alkali carbonate influences of therefore traditional test is difficult to effectively weigh the influence of blast furnace high-temperature area alkaline metal STRENGTH ON COKE deterioration.The someone has proposed to influence device with test alkaline metal STRENGTH ON COKE deterioration in the recent period, alkaline metal simple substance and coke put together be heated to 800 ℃-900 ℃ after vacuumizing alkaline metal is enriched in method on the coke, but the method is owing to be subjected to the lower restriction of alkaline metal boiling point (below 900 ℃) can't test the influence of alkaline metal STRENGTH ON COKE in the high-temperature area more than 1100 ℃, and coke and alkaline metal is placed on artificially also can't simulates and test the adsorptive power of alkali vapor uphill process on coke in the actual blast furnace in the monkey.In addition, when influencing, measurement blast furnace alkali rich region alkaline metal STRENGTH ON COKE deterioration still lacks the effectively evaluating index at present.To sum up, in the influence of absorption on the coke and STRENGTH ON COKE deterioration, still exist blank at simulation test blast furnace alkali rich region alkaline metal simple substance steam at present.

Summary of the invention

The invention reside in the method that the influence of a kind of simulation test alkaline metal STRENGTH ON COKE deterioration is provided, solution can't simulation test 1100-1300 ℃ the absorption on coke and have or not CO in uphill process of following alkaline metal simple substance steam ₂The time STRENGTH ON COKE deterioration influence problem, and provide the quantitatively evaluating index of estimating coke alkali resistant metal harm ability under the high temperature, filling up existing test and estimating adsorptive power and the STRENGTH ON COKE deterioration of blast furnace alkali rich region alkaline metal on coke influences existing blank.

The present invention simulates that alkali vapor comprises aspect two in the absorption and the STRENGTH ON COKE Effect on Performance of uphill process on coke under the high temperature, and the one, CO is arranged at simulation test cohesive zone top ₂The influence of alkali metal vapour STRENGTH ON COKE melting loss reaction when existing, the 2nd, simulation test cohesive zone bottom does not have CO ₂The absorption of alkali metal vapour on coke under existence and the higher temperature, its processing step is as follows:

Activated carbon powder that weighing is quantitative and alkali carbonate powder are (according to 2C+R ₂CO ₃The reaction equation calculated activity carbon dust of=3CO+2R and the mass ratio of carbonate, and it is slightly many to add the fashionable activated carbon powder amount that makes), the corundum crucible of packing into after the mixing, corundum crucible is placed on the bottom (top of high aluminium ball) of pyroreaction container, the ventilative corundum packing ring of placing porous on corundum crucible, three high temperature resistant corundum arms that 30-60mm is high are placed in the packing ring top, place ventilative packing ring above the corundum arm again, hold coke specimen on the packing ring, test unit is shown in accompanying drawing in the instructions.After sample placed, the beginning heat temperature raising also fed the interior air of argon gas discharge reaction vessel, after the temperature in the reaction tube reaches 1200 ℃, begins to generate alkali metal vapour.If after this think not exist under the researching high-temperature CO ₂The time alkali metal vapour insulation 2 hours after the adsorbance on the coke (analog blast furnace cohesive zone bottom) then continues to feed argon gas and is warming up to 1300 ℃; There is CO if think under the researching high-temperature ₂The time (analog blast furnace cohesive zone top) alkali metal vapour STRENGTH ON COKE melting loss reaction influence, then will take place near the alkaline metal simple substance steam heating-up temperature by the Current Control adjusting heating element and pass through at 1200 ℃-1250 ℃, and with the zone at coke specimen place by the Current Control adjusting heating element and pass through at 1100 ℃, begin to feed the CO of 5l/min then ₂And after this isothermal reaction be cooled to room temperature in 2 hours under the protection of argon gas, again the coke behind the absorption alkali vapor carried out observation and analysis.

Coke alkali resistant metal of the present invention destroys evaluation index:

(1) is illustrated in fig. 2 shown below, to 1300 ℃ and there is not CO ₂Condition under the coke of k adsorption steam get its coke breeze sample (particle diameter＜10mm), the coke of absorption sodium vapor is got its surface color change tangible burnt sample, adopt the atom absorbance method to record potassium in the burnt sample, sodium element amount, on behalf of coke, this index can absorb the maximum capacity of potassium vapor and sodium vapor;

(2) 1300 ℃ and do not have CO ₂Condition under carry out rotary drum and screening behind the coke absorption alkali metal vapour, as the coke evaluation index destroyed of alkali resistant metal vapors at high temperature, the low more representative coke alkali resistance of this value is good more with the coke quality ratio of＜10mm;

(3) 1100 ℃ and have CO ₂Condition under carry out carrying out rotary drum and screening after the gasification reaction test of coke, with the coke quality ratio of＞10mm evaluation index as coke alkali resistant metal vapors catalysis melting loss, performance of the high more representative coke alkali resistant metal catalytic of this value is good more.

The invention has the beneficial effects as follows: can simulation test in blast furnace alkaline metal rich region potassium, the adsorptive power of sodium vapor on coke and the influence of STRENGTH ON COKE deterioration, can be used as the newly-increased quality evaluation index of blast-furnace coke, especially for going into the higher blast furnace of stove alkali load, by adopting the present invention to carry out test of coke alkali resistance and coke alkali resistant catalysis test, can reasonably go into stove alkaline metal load for blast furnace control, control alkaline metal provides the foundation of quantification to the harm of blast furnace process.

Description of drawings

Fig. 1 influences device for test alkaline metal STRENGTH ON COKE deterioration.Wherein: air intake opening 1, corundum crucible 2, corundum arm 3, the burnt sample 4 of test, gas outlet 5, reaction tube loam cake 6, thermometric galvanic couple 7, reaction tube 8, porous breathable corundum packing ring 9, alumina balls 10.

Fig. 2 during for the potassium on the test simulation blast furnace alkali rich region coke, sodium maximal absorptive capacity the burnt sample that should get.

Embodiment

Is example with coke under the test high temperature to the adsorption test of potassium vapor, and its embodiment is:

The particle diameter of getting the actual usefulness of blast furnace is the coke 200g of 21-25mm, again according to reaction: 2C+K ₂CO ₃=3CO+2K gets and produces required sal tartari 17.69g of 10g simple substance potassium and excessive activated carbon powder 4.0g, to put into corundum crucible 2 behind sal tartari and the activated carbon powder mixing, again corundum crucible 2 is put into reaction tube shown in the present 8, on corundum crucible 2, place ventilating porous corundum packing ring 9, place the high corundum arm 3 of 50mm again, 3, on corundum arm 3, place ventilating porous corundum packing ring 9 again, put the 200g coke on the ventilating porous corundum packing ring 9, after this loam cake 6 with reaction tube seals, begin to feed the high pure nitrogen of 5l/min with deaeration, after this reaction tube loam cake 6 lids tightly and with masking foil are sealed, beginning is warming up to 1300 ℃ with the speed of 10 ℃/min, constant temperature is 2 hours after 1300 ℃, be cooled to room temperature more gradually, remain the feeding high pure nitrogen in this process, after specimen temperature is cooled to room temperature, burnt sample is taken out from reaction tube 8, again in the I type rotary drum with the rotating speed corotation 30min of 20r/min, focusing sample granularity is sieved, draw＜coke (coke breeze) mass ratio of 10mm, this value is the evaluation index that the at high temperature anti-potassium vapor of coke destroys, and get coke breeze sample 5g, adopt the atom absorbance method to record potassium element amount in the burnt sample, on behalf of coke, this value promptly absorb the maximum capacity of potassium vapor.

Claims

1. the method for simulation test alkaline metal STRENGTH ON COKE deterioration influence is characterized in that processing step is as follows:

Activated carbon powder that weighing is quantitative and alkali carbonate powder, the corundum crucible of packing into after the mixing, corundum crucible is placed on the top of the bottom high aluminium ball of pyroreaction container, the ventilative corundum packing ring of placing porous on corundum crucible, three high temperature resistant corundum arms that 30-60mm is high are placed in the packing ring top, above the corundum arm, place ventilative packing ring again, hold coke specimen on the ventilative packing ring, after sample places, the beginning heat temperature raising also feeds the interior air of argon gas discharge reaction vessel, after the temperature in the reaction tube reaches 1200 ℃, begin to generate alkali metal vapour;

Under researching high-temperature, there is not CO ₂The time during adsorbance of alkali metal vapour on coke, insulation is 2 hours after then continuing to feed argon gas and be warming up to 1300 ℃;

Under researching high-temperature, there is CO ₂The time during the influencing of alkali metal vapour STRENGTH ON COKE melting loss reaction, then will take place near the alkaline metal simple substance steam heating-up temperature by the Current Control adjusting heating element and pass through at 1200 ℃-1250 ℃, and with the zone at coke specimen place by the Current Control adjusting heating element and pass through at 1100 ℃, begin to feed the CO of 5l/min then ₂And isothermal reaction 2 hours;

After this, under the protection of argon gas, be cooled to room temperature, again the coke behind the absorption alkali vapor carried out observation and analysis;

It is as follows that coke alkali resistant metal destroys evaluation index:

To 1300 ℃ and there is not CO ₂Condition under the coke of k adsorption steam get its coke breeze sample particle diameter＜10mm, the coke of absorption sodium vapor is got its surface color change tangible burnt sample, adopt the atom absorbance method to record potassium in the burnt sample, sodium element amount, on behalf of coke, this index absorb the maximum capacity of potassium vapor and sodium vapor;

1300 ℃ and do not have CO ₂Condition under carry out rotary drum and screening behind the coke absorption alkali metal vapour, as the coke evaluation index destroyed of alkali resistant metal vapors at high temperature, the low more representative coke alkali resistance of this value is good more with the coke quality ratio of＜10mm;

1100 ℃ and have CO ₂Condition under carry out carrying out rotary drum and screening after the gasification reaction test of coke, with the coke quality ratio of＞10mm evaluation index as coke alkali resistant metal vapors catalysis melting loss, performance of the high more representative coke alkali resistant metal catalytic of this value is good more.

2. method according to claim 1 is characterized in that, quantitative activated carbon powder and alkali carbonate powder are according to 2C+R ₂CO ₃The reaction equation calculated activity carbon dust of=3CO+2R and the mass ratio of carbonate are adding fashionablely, make the activated carbon powder amount slightly unnecessary, so that reaction is more complete.