CN115341090A - Method for improving productivity of sintering machine - Google Patents
Method for improving productivity of sintering machine Download PDFInfo
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- CN115341090A CN115341090A CN202210942765.1A CN202210942765A CN115341090A CN 115341090 A CN115341090 A CN 115341090A CN 202210942765 A CN202210942765 A CN 202210942765A CN 115341090 A CN115341090 A CN 115341090A
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- 238000005245 sintering Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 3
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000008034 disappearance Effects 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 23
- 230000035699 permeability Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
Abstract
The invention discloses a method for improving the productivity of a sintering machine, which relates to the technical field of steel production, and is characterized in that the position of an air box when a sintering over-wet belt disappears is taken as a separation point, the opening degree of an air box regulating valve from the end position of a first section, namely an ignition section, to the position where the over-wet belt disappears is increased, the opening degree of an air box regulating valve from the end position of a second section, namely the position where the over-wet belt disappears to the position where the sintering ends is reduced, and the longitudinal air volume distribution of the sintering machine is optimized. The longitudinal air quantity distribution of the sintering machine is optimized by adjusting the opening degree of the air box adjusting valve of the sintering section, and the sintering productivity is improved.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a method for improving the productivity of a sintering machine.
Background
At present, the iron-making system in China mainly adopts sintering, pelletizing and blast furnace processes, and sintered ores are main blast furnace burden and account for about 75 percent of the total blast furnace burden in China. Sintering productivity is an important index of sintering machine production capacity and an important influence factor of sintering plant benefit. On the premise of ensuring the quality of the sintered ore, the method improves the sintering productivity, is an important way for sintering plants to obtain low consumption and high benefit, and is the key for ensuring the proportion of the blast furnace sintered ore and reducing the cost of molten iron. The greater the vertical sintering rate and sinter strength, the higher the productivity of the sintering machine under a given sintering machine and feedstock conditions. The air quantity passing through the material layer is the key for influencing the vertical sintering speed and the strength of the sinter, the larger the air quantity passing through the material layer is, the higher the vertical sintering speed is, the higher the cooling speed of the sinter is, and the strength of the sinter is reduced.
In the sintering process, the material layer is generally divided into a sintering ore zone, a combustion zone, a drying preheating zone, an over-wet zone and a raw material layer zone, and the five sintering zones are shown in figure 1. On the premise of constant air volume of the sintering main exhaust fan, the opening degrees of air box regulating valves at the lower part of a general sintering section are the same, and the air volume passing through a sintering material layer is determined by the air permeability of the material layer. After sintering ignition is finished, the over-wet zone and the combustion zone are main factors influencing the air permeability of the material layer, and when the over-wet zone disappears along with sintering, the air permeability of the material layer becomes good, and the combustion zone becomes a main factor influencing the air permeability of the material layer. Before the over-wet belt disappears, the air quantity passing through the material layer is small due to poor air permeability of the material layer, and the sintering speed is slow; after the over-wet zone disappears, the air permeability of the material layer becomes good, the air quantity passing through the material layer is large, but at the moment, the sintered ore formed on the upper part of the material layer is in the soaking stage, the liquid state generated by sintering is gradually crystallized in the cooling process, and the excessive air quantity can cause the too fast cooling speed of the sintered ore and the strength of the sintered ore to be poor. Therefore, the longitudinal air distribution of the sintering machine is optimized on the premise of keeping the constant air quantity of the main sintering exhaust fan and ensuring that the sintered mineral quantity is not reduced, and the method has important significance for improving the sintering productivity.
Disclosure of Invention
The invention aims at the technical problems and overcomes the defects of the prior art, and provides a method for improving the productivity of a sintering machine, which takes the position of an air box when a sintering over-wet belt disappears as a separation point, increases the opening degree of an air box regulating valve from the end position of a first section, namely an ignition section, to the position where the over-wet belt disappears, reduces the opening degree of an air box regulating valve from the end position of a second section, namely the position where the over-wet belt disappears to the position where the sintering ends, and optimizes the longitudinal air volume distribution of the sintering machine.
The invention further defines the technical scheme that:
in the method for improving the productivity of the sintering machine, the method for judging the position of the air box when the over-wet sintering zone disappears comprises the following steps: from the end position of the ignition section to the tail part of the sintering machine, the temperature of the air box starts to obviously rise.
In the method for improving the productivity of the sintering machine, the increase or decrease of the opening degree of the air box regulating valve means that the opening degree of the air box regulating valve at the first section is larger than that of the air box regulating valve at the second section.
In the method for improving the productivity of the sintering machine, the optimization of the longitudinal air volume distribution of the sintering machine refers to that the total air volume of the air draft of the first sinter bed section is increased and the total air volume of the air draft of the second sinter bed section is reduced on the premise that the air volume of the main sintering exhaust fan is constant.
In the method for improving the productivity of the sintering machine, the opening degree of the air box regulating valve of the first section is increased from 3/4 to full opening, and the opening degree of the air box regulating valve of the second section is reduced from 3/4 to 1/2.
The invention has the beneficial effects that:
(1) According to the invention, on the premise of constant air volume of the sintering main exhaust fan and no reduction of the sintered mineral content, the longitudinal air volume distribution of the sintering machine is optimized by adjusting the opening degree of the air box adjusting valve at the sintering section, so that the sintering productivity is improved;
(2) The invention does not need to additionally purchase or transform equipment, only needs to adjust the air box adjusting valve, has the advantages of nearly zero cost and simple operation, has obvious effect on improving the sintering productivity, and can improve the productivity and reduce the production cost.
Drawings
FIG. 1 is a schematic diagram of the background art.
Detailed Description
Examples
600m of a certain plant 2 The suction type air boxes on two sides of the sintering machine are 28 groups in total, 1# to 5# air boxes are ignition section air boxes, 6# to 28# air boxes are sintering section air boxes, and the opening degree of the air volume adjusting valves of the 1# to 5# air boxes is unchanged according to the ignition requirements. When the opening degrees of the 6# to 28# bellows adjusting valves are the same, the 18# bellows temperature starts to obviously rise, and the node is a lost node of the excessively wet belt of the material layer. First, by increasing the 6# to 17# bellows adjusting valves on both sides to the fully open state and decreasing the 18# to 28# bellows adjusting valves on both sides to the 1/2 open state, the bellows temperature analysis was performed, and it was found that in this air volume distribution state, the 17# bellows temperature started to rise significantly, becoming a new node where the excessively wet band of the material layer disappeared. Then, the 17# bellows adjusting valve was decreased to the 1/2 open state while keeping the opening degrees of the other bellows adjusting valves unchanged. Under the condition that the total air draft of the main exhaust fan is kept unchanged, the ISO drum index of the sinter is 79.88 percent, and the productivity of the sintering machine is 1.41 t/(m) 2 H) is improved by 8.46% compared with the sintering machine when the opening degree of the air box regulating valve is not changed.
TABLE 1 sintering machine sintering section air volume optimization front and back air box regulating valve opening degree and utilization coefficient
The principle is as follows:
sintering productivity is an important index of sintering machine productivity, and sintering machine productivity is generally expressed by a sintering machine utilization factor, and a calculation formula of the sintering machine utilization factor:
p=60×υ ⊥ ×r×K
in the formula: q-sintering machine hourly production, t/(m) 2 ·h)；
υ ⊥ -vertical sintering speed, mm/min;
r-sintered ore bulk density, t/m 3 ；
Yield of K-sinter%. .
When other conditions are fixed, the larger the air quantity penetrating through the material layer is, the larger the vertical sintering speed is, and the sintering utilization coefficient is favorably improved. The drum strength of the sinter is one of the key influence factors influencing the finished product ratio of the sinter, and in the soaking stage of the sinter, the smaller the air quantity passing through a sinter layer is, the slower the cooling speed of the sinter is, the more perfect the crystallization of the sinter is, the higher the drum strength of the sinter is, the higher the finished product ratio is, and the improvement of the sintering utilization coefficient is facilitated.
In the iron ore sintering process, after the sintered material runs through the ignition heat preservation section, the sintered material layer enters the first section, namely from the end position of the ignition section to the disappearance position of the over-wet zone. In the first section, the over-wet belt is gradually widened, the air permeability of the material layer is poor, and the air quantity passing through the material layer is small, so that the sintering speed is low. The invention increases the opening degree of the wind box adjusting valve in the first section, so that more wind passes through the material layer, the sintering speed of the first section is accelerated, and the sintering productivity can be improved. When the over-wet belts disappear in the sinter bed, the temperature of the windbox below the sinter starts to rise significantly. When the sinter bed enters the second section, namely from the position where the over-wet zone disappears to the position where sintering is finished, the over-wet zone disappears, the air permeability of the sinter bed becomes good, the air quantity passing through the sinter bed is large, the cooling speed of newly formed sinter is accelerated, and the strength of the sinter is reduced. The invention reduces the opening degree of the wind box adjusting valve in the second section, reduces the wind quantity passing through the material layer, slows down the cooling speed of the sinter, improves the crystallization of the sinter, improves the strength of the sinter and can improve the sintering productivity.
Comparative example
The total 28 groups of suction type air boxes on two sides of a 600m2 sintering machine in a certain factory are provided, 1# to 5# air boxes are ignition section air boxes, 6# to 28# air boxes are sintering section air boxes, 1# to 5# air boxes are ignition section air boxes, the opening degree of air box adjusting valves is unchanged, and when the 6# to 28# air box adjusting valves on two sides are in a 3/4 opening state, the temperature of the 18# air box starts to rise obviously through the analysis of the air box temperature, and the air box temperature is a vanishing node of an over-wet material layer. At this time, the sintered ore ISO drum index was 79.23%, and the sintering machine utilization factor was 1.30 t/(m) 2 ·h)。
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. A method of increasing productivity of a sintering machine, characterized by: the position of the air box when the sintered over-wet zone disappears is taken as a separation point, the opening degree of the air box regulating valve from the first section, namely the end position of the ignition section, to the over-wet zone disappearance position is increased, the opening degree of the air box regulating valve from the second section, namely the over-wet zone disappearance position to the sintering end position is reduced, and the longitudinal air volume distribution of the sintering machine is optimized.
2. The method for increasing productivity of a sintering machine according to claim 1, wherein: the method for judging the position of the air box when the sintering over-wet belt disappears comprises the following steps: from the end position of the ignition section to the tail part of the sintering machine, the temperature of the air box starts to obviously rise.
3. A method of increasing productivity of a sintering machine according to claim 1, characterized in that: increasing or decreasing the opening degree of the bellows adjusting valve means that the opening degree of the bellows adjusting valve at the first stage is larger than the opening degree of the bellows adjusting valve at the second stage.
4. The method for increasing productivity of a sintering machine according to claim 1, wherein: the longitudinal air quantity distribution optimization of the sintering machine refers to that the total air quantity of air draft of the first section sinter bed is increased and the total air quantity of air draft of the second section sinter bed is reduced on the premise that the air quantity of the main sintering exhaust fan is constant.
5. A method of increasing productivity of a sintering machine according to claim 1, characterized in that: the opening degree of the bellows adjusting valve in the first stage is increased from 3/4 to full opening, and the opening degree of the bellows adjusting valve in the second stage is decreased from 3/4 to 1/2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210942765.1A CN115341090A (en) | 2022-08-08 | 2022-08-08 | Method for improving productivity of sintering machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210942765.1A CN115341090A (en) | 2022-08-08 | 2022-08-08 | Method for improving productivity of sintering machine |
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| CN115341090A true CN115341090A (en) | 2022-11-15 |
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| CN202210942765.1A Pending CN115341090A (en) | 2022-08-08 | 2022-08-08 | Method for improving productivity of sintering machine |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101784A1 (en) * | 2012-12-27 | 2014-07-03 | 中冶长天国际工程有限责任公司 | Method and system for predicting burn-through point |
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- 2022-08-08 CN CN202210942765.1A patent/CN115341090A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014101784A1 (en) * | 2012-12-27 | 2014-07-03 | 中冶长天国际工程有限责任公司 | Method and system for predicting burn-through point |
Non-Patent Citations (1)
| Title |
|---|
| 许斌;常亮亮;姜涛;郭宇峰;李光辉;杨永斌;: "合理垂直烧结速度的研究", 中南大学学报(自然科学版), vol. 38, no. 2, pages 1 - 14 * |
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Application publication date: 20221115 |