CN107860680B - Analysis method for blast furnace tuyere coke granularity composition and slag retention - Google Patents
Analysis method for blast furnace tuyere coke granularity composition and slag retention Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
Abstract
The invention belongs to the technical field of blast furnace ironmaking, and particularly relates to a method for analyzing the grain size composition and slag retention of blast furnace tuyere coke, which comprises the following steps: blowing down the blast furnace, taking out coke and drying; stripping slag and iron on the surface of the tuyere coke; weighing the collected slag mass w1(ii) a Obtaining the volume V of tuyere coke of different size fractions by a volume method1、V2、V3、V4、V5(ii) a So as to analyze and obtain the grain size composition of the tuyere coke; multiplying the total volume of the tuyere coke by the apparent density of the coke to obtain the mass W of the tuyere coke2，W1/W2Namely the retention of the slag. The method can accurately represent the grain size composition of the tuyere coke; the method does not need to manually strip the iron which is difficult to strip on the surface of the tuyere coke, and is easy to realize and accurate; is suitable for volume 3000m3In the production application of the blast furnace, the blending scheme of raw materials such as coking coal, ore and the like can be further adjusted according to the tuyere coke particle size distribution and the slag retention obtained by analysis, so that the blast furnace is stable and smooth.
Description
Technical Field
The invention belongs to the technical field of blast furnace ironmaking, and particularly relates to a method for analyzing the grain size composition and slag retention of blast furnace tuyere coke.
Background
The coke charging process to the blast furnace and the completion of the smelting process is a process of gradual deterioration. In the block belt, the coke is mainly subjected to mechanical collision, extrusion and friction, and the block degree of the coke is slightly reduced but not obvious; until the molten drop zone is subjected to high-temperature thermodynamic action and CO2And under the action of gasification reaction, the coke has thinner pore wall, increased porosity, reduced granularity, reduced strength and gradual pulverization, so that the air permeability of the blast furnace material column is reduced. The region of the molten drip zone is the critical area of degradation where the degree of coke degradation will be directly related to the success of the blast furnace process. In addition, in the process of blast furnace smelting, as the temperature of the raw materials is increased along with the downward movement, substances with lower melting points are gradually melted to form blast furnace slag. The slag passes through the coke between the reflow zone and the hearth, if the slag fluidity is good, the retention amount in the coke layer is small, the ventilation of the blast furnace is good, and the blast furnace moves forward. Therefore, the coke quality requirement of blast furnace smelting is known through the research on the coke degradation condition of the blast furnace tuyere, so as to guide the coke production to meet the blast furnace smelting requirement; by knowing the slag retention in the tuyere area, whether the raw material components of the ore are proper can be judged, and guidance suggestion for timely adjusting the proportion of the ore is provided.
Tuyere coke sampling and grain size composition analysis are carried out in various domestic steel plants such as Bao steel, first steel, Wu steel, horse steel, ladle steel, climbing steel and the like. The conventional method for analyzing the tuyere coke particle size composition comprises the following steps: manually stripping iron slag on the surface of the tuyere coke by a knife, then selecting a standard grading sieve to grade the granularity of the tuyere coke, then weighing the mass of each grain-grade tuyere coke by a balance, and calculating the mass percentage of each grain-grade tuyere coke to represent the granularity composition of the tuyere coke. The method has the disadvantages that most of the iron adhered to the surface of the tuyere coke permeates into the surface and the air holes of the tuyere coke, the iron and the coke are integrated, the manual method of peeling off by a knife consumes more labor and time cost, the separation is not complete, and the density of the iron is 7.8g/cm3Coke, cokeThe apparent density was about 0.9g/cm3, and incompletely separated iron caused a large deviation in the coke weighing. Patent CN106154868A discloses a blast furnace tuyere coke particle size classification control method, which is used for mechanically screening and classifying blast furnace tuyere coke to measure the percentage of coke with each particle size class in the total mass of coke. The solution is a weighing method, the volume percentage of iron in the coke is observed through a microscope, and then the weight of the iron is reduced. However, there is a problem in that sampling is representative, and the coke used for the tablet only occupies a small part of the tuyere coke, which may cause errors. And a precise instrument microscope is used, and iron ore carried in coke by coal has certain interference on a measurement result.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to avoid the error of weighing the mass of each grain size of the tuyere coke, realize the accurate control of the granularity of the blast furnace tuyere coke without manually stripping iron tightly adhered on the surface of the tuyere coke, and judge the fluidity of the tuyere coke and the suitability of the raw material ore proportioning through the slag retention.
In order to achieve the aim, the invention provides a method for analyzing the grain size composition and slag retention of blast furnace tuyere coke, which comprises the following steps:
1) when the blast furnace stops blowing, taking out coke with a tuyere sampler, wherein the tuyere sampler is horizontal to the tuyere in the radius direction of the furnace bosh, and drying the coke;
2) stripping loose slag and iron on the surface of the tuyere coke by using a manual knife, separating the slag and the iron by using a magnet, collecting the slag, weighing the slag, and recording the amount of the slag as w1；
3) The tuyere coke stripped of the slag and partial iron in the step 2) is classified into d by a standard grading sieve1mm、d1～d2mm、d2～d3mm、d3～d4mm、d4～d5mm、＜d5A size fraction of mm;
4) filling bituminous coal particles into an iron container with volume scales, wherein the amount of the bituminous coal particles is required to completely submerge tuyere coke of each size fraction;
5) record the volume V of the initial bituminous coal particles in the iron container0In the introduction of > d1mm windThe coke is completely submerged by the bituminous coal particles, and the volume sum V of the coke and the bituminous coal particles is recorded01Will V01V0To obtain > d1Volume V of mm size fraction tuyere coke1；
6) According to the method of the step 5), the initial volume of the bituminous coal particles is recorded before the tuyere coke with different size fractions is placed into the iron container each time, the volume sum of the tuyere coke and the bituminous coal particles is recorded after the tuyere coke with different size fractions is placed into the iron container, and then the volume sum of the tuyere coke and the bituminous coal particles is subtracted from the initial volume of the bituminous coal particles to respectively obtain the value of more than d1mm、d1～d2mm、d2～d3mm、d3～d4mm、d4～d5mm、＜d5Volume V of mm size fraction tuyere coke1、V2、V3、V4And V5；
7) The particle size composition of the tuyere coke is respectively expressed by the following calculation modes:
V1*100％/(V1+V2+V3+V4+V5)、V2*100％/(V1+V2+V3+V4+V5)、V3*100％/(V1+V2+V3+V4+V5)、V4*100％/(V1+V2+V3+V4+ V5) and V5*100％/(V1+V2+V3+V4+V5)；
8) The tuyere coke mass w is obtained by multiplying the tuyere coke volume by the apparent coke density2Amount of slag w1Divided by the coke mass w of the tuyere2The retention of slag is obtained.
Specifically, the coke taken out in the step 1) is put into an oven to be dried for 2 hours at the temperature of 175 +/-2 ℃.
Specifically, the particle size of the bituminous coal particles is 0.3-0.5 mm, and the moisture content is less than 2%.
The invention has the beneficial effects that: 1) because the iron adhered to the surface of the tuyere coke has little influence on the volume of the tuyere coke, the volume measurement is carried out by utilizing the soft coal particles with the granularity far smaller than that of the tuyere coke and the tuyere coke with different size fractions in a container with volume scales, and then the volume is measured by hundreds ofThe mass percent is converted into the mass percent, the volume measurement method is simple and convenient, and the finally obtained mass percent is more accurate; 2) only the slag and iron on the surface of the tuyere coke are needed to be manually stripped, and the iron which is difficult to strip on the surface of the tuyere coke is not needed to be manually stripped, so that the method is easy to realize and accurate; 3) the technical scheme is suitable for the volume of 3000m3In the production application of the blast furnace, the blending scheme of raw materials such as coking coal, ore and the like can be further adjusted according to the tuyere coke particle size distribution obtained by analysis and the slag retention obtained by calculating by a tuyere coke volume method, so that the blast furnace is stable and smooth.
Detailed Description
The invention is further illustrated by the following examples, without restricting the invention thereto. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof. The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.
At 3200m3For a volumetric blast furnace as an example, the analysis of the coke grain size composition and slag retention at the tuyere of the blast furnace was carried out according to the following procedure.
1) A tuyere sampler is adopted to extend into the furnace for 1.5 meters along the furnace wall towards the furnace core direction, and the length of the tuyere sampler is 3200 meters for a certain enterprise3Sampling the volume blast furnace during damping down for 3 times, putting the tuyere coke taken out each time into a test steel barrel, and immediately covering the test steel barrel with wet cotton cloth after the test sample is taken out each time;
2) taking a tuyere coke sample, transporting the tuyere coke sample back to a laboratory, placing the coke layer in a stainless steel tray, and placing the stainless steel tray in an oven to dry for 2 hours at the temperature of 175 +/-2 ℃;
3) manually stripping loose slag and iron on the surface of the tuyere coke by a knife, separating the slag and the iron by a magnet, collecting the slag and weighing, and recording the slag amount as w11.57 kg;
4) dividing the tuyere coke with the slag and part of iron removed into size fractions of more than 40mm, 40-25 mm, 25-20 mm, 20-6 mm, less than 6mm and the like by using a standard grading sieve;
5) filling a certain amount of bituminous coal particles with the granularity of 0.3-0.5 mm and the moisture of less than 2% into an iron container with volume scales, wherein the amount of the bituminous coal particles is required to completely submerge tuyere coke of each size fraction;
6) record the volume V of the initial bituminous coal particles in the iron container0Putting the tuyere coke with the diameter of more than 40mm into the furnace body to be completely submerged by the bituminous coal particles, and recording the volume sum V of the tuyere coke and the bituminous coal particles at the moment01Will V01-V0Obtaining the volume V of the tuyere coke with the grain size of more than 40mm1；
7) According to the steps, the initial volume of the bituminous coal particles is recorded before the tuyere coke with different size fractions is placed into the iron container every time, the volume sum of the tuyere coke and the bituminous coal particles is recorded after the tuyere coke with different size fractions is placed, and then the volume sum of the tuyere coke and the bituminous coal particles is subtracted from the initial volume of the bituminous coal particles to obtain the volume V of the tuyere coke with different size fractions1、V2、V3、V4、V5；
8) The particle size composition of the tuyere coke is respectively expressed by the following calculation modes:
V1*100％/(V1+V2+V3+V4+V5)、V2*100％/(V1+V2+V3+V4+V5)、V3*100％/(V1+V2+V3+V4+V5)、V4*100％/(V1+V2+V3+V4+ V5) and V5*100％/(V1+V2+V3+V4+V5)；
9) Multiplying the volume of the coke in the tuyere by the apparent density of the coke of 0.9g/cm3Obtaining the total mass w of the tuyere coke2Amount of slag w1Divided by the coke mass w of the tuyere2The retention of slag is obtained.
The analysis results of the coke particle size composition and slag retention of each fraction tuyere are shown in Table 1 below.
TABLE 1 analysis of tuyere coke particle size composition and slag retention at each fraction
3200m of a certain enterprise obtained by the technical method3The volume of the blast furnace tuyere coke is more than 40mm, 40-25 mm, 25-20 mm, 20-6 mm, less than 6mm and the likeThe volume percentages of the particle size fractions are respectively 3.15%, 13.24%, 17.69%, 63.57% and 2.35%, wherein the proportion of the particle size fraction smaller than 20mm is up to more than 65%, so that the strength of the coke entering the blast furnace is judged to be low, the stable and smooth operation of the blast furnace cannot be met, measures are immediately taken, and the ratio of the strong caking coke to coal is increased by 3%; 3200m of a certain enterprise obtained by the technical method3The retention of the slag in the blast furnace tuyere coke reaches 10.76%, so that the slag flowability is judged to be insufficient, measures are immediately taken, and the proportion of the high-alumina ore is reduced by 3%. Two measures are taken to avoid blast furnace fluctuation, and the fuel ratio of the blast furnace is stabilized below 510kg/t iron.
The technical scheme of the conventional weight method cannot judge the problems of coke entering into the furnace and ore raw materials, cannot timely adopt technical measures to avoid blast furnace fluctuation, causes large fuel consumption due to the blast furnace fluctuation, and has the fuel ratio of more than 515kg/t iron.
Claims (3)
1. A method for analyzing the grain size composition and slag retention of blast furnace tuyere coke is characterized by comprising the following steps: the method comprises the following steps:
1) when the blast furnace stops blowing, taking out coke with a tuyere sampler, wherein the tuyere sampler is horizontal to the tuyere in the radius direction of the furnace bosh, and drying the coke;
2) stripping loose slag and iron on the surface of the tuyere coke by using a manual knife, separating the slag and the iron by using a magnet, collecting the slag, weighing the slag, and recording the amount of the slag as w1；
3) The tuyere coke stripped of the slag and partial iron in the step 2) is classified into d by a standard grading sieve1mm、d1～d2mm、d2～d3mm、d3～d4mm、d4～d5mm、＜d5A size fraction of mm;
4) filling bituminous coal particles into an iron container with volume scales, wherein the amount of the bituminous coal particles is required to completely submerge tuyere coke of each size fraction;
5) record the volume V of the initial bituminous coal particles in the iron container0In the introduction of > d1The mm tuyere coke is completely submerged by the bituminous coal particles, and the volume sum V of the tuyere coke and the bituminous coal particles at the moment is recorded01Will V01V0To obtain > d1Volume V of mm size fraction tuyere coke1；
6) According to the method of the step 5), the initial volume of the bituminous coal particles is recorded before the tuyere coke with different size fractions is placed into the iron container each time, the volume sum of the tuyere coke and the bituminous coal particles is recorded after the tuyere coke with different size fractions is placed into the iron container, and then the volume sum of the tuyere coke and the bituminous coal particles is subtracted from the initial volume of the bituminous coal particles to respectively obtain the value of more than d1mm、d1～d2mm、d2～d3mm、d3～d4mm、d4～d5mm、＜d5Volume V of mm size fraction tuyere coke1、V2、V3、V4And V5；
7) The particle size composition of the tuyere coke is respectively expressed by the following calculation modes: v1*100％/(V1+V2+V3+V4+V5)、V2*100％/(V1+V2+V3+V4+V5)、V3*100％/(V1+V2+V3+V4+V5)、V4*100％/(V1+V2+V3+V4+ V5) and V5*100％/(V1+V2+V3+V4+V5)；
8) The tuyere coke mass w is obtained by multiplying the tuyere coke volume by the apparent coke density2Amount of slag w1Divided by the coke mass w of the tuyere2The retention of slag is obtained.
2. The method for analyzing the grain size composition and slag retention of the tuyere coke of the blast furnace as claimed in claim 1, wherein: putting the coke taken out in the step 1) into an oven to be dried for 2 hours at the temperature of 175 +/-2 ℃.
3. The method for analyzing the grain size composition and slag retention of the tuyere coke of the blast furnace as claimed in claim 1, wherein: the particle size of the bituminous coal particles is 0.3-0.5 mm, and the water content is less than 2%.
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