A method and application for increasing the temperature of blast furnace top gas

Abstract

This invention relates to the field of blast furnace technology, specifically to a method and application for increasing the temperature of blast furnace top gas. The method includes: S1, real-time monitoring of the blast furnace top temperature; adjusting the temperature of blast furnaces whose top temperatures do not meet the standard; and stopping the adjustment for blast furnaces whose top temperatures meet the standard; S2, repeating step S1 until the temperature of the blast furnace top meets the standard when the adjustment time is greater than the lag time. The adjustment time is the time difference between the current temperature measurement time and the start time of the current adjustment, and the lag time is the time difference between the moment when the top temperature of the blast furnace reaches the standard after each adjustment method takes effect in historical data and the start time of the adjustment action. This invention avoids the problem of excessively high top temperatures caused by inaccurate judgment of the adjustment result and repeated adjustments due to the lag nature of blast furnaces when the adjustment time is too short, thus preventing energy waste.

Description

Technical Field

[0001] This invention relates to the field of blast furnace technology, and specifically to a method and application for increasing the temperature of blast furnace top gas. Background Technology

[0002] Dry dust collection in blast furnaces is an advanced process for purifying blast furnace gas. Dry baghouse dust collection requires specific temperatures for the blast furnace gas; the raw gas entering the chamber must be between 100-260℃. However, if the gas temperature is below 100℃, water vapor condensation occurs. The damp gas passing through the baghouse will cause the filter bags to become damp. Dry blast furnace ash will accumulate in the damp bags, clogging the vents and reducing the dust collection capacity, ultimately rendering the filter bags unusable. The reasons for the low temperature of the blast furnace top gas are as follows: 1. The oxygen enrichment rate reaches 6% to 7%. After oxygen-enriched blasting, the unit pig iron air volume decreases, and although the theoretical combustion temperature increases, the gas volume decreases significantly. The heat is mainly concentrated below the furnace belly, causing the high-temperature zone to shift downward and the furnace top temperature to decrease. 2. The blast furnace has a high level of intensified smelting, with an average hourly material rate of 6.5 batches. The heat exchange efficiency between the rising high-temperature gas flow and the low-temperature furnace charge is high, resulting in a lower temperature of the gas rising to the furnace top. 3. Due to insufficient dry quenching coke supply, the blast furnace has long used a portion of wet coke, affecting the temperature of the blast furnace top gas. 4. The physical calorific value of the sinter used in the blast furnace is low. The distance between the feeding sintering machine and the blast furnace is far, and the sinter needs to be transported by belt for a long distance. The poor sealing of the belt corridor results in a low physical calorific value of the sinter entering the furnace, affecting the temperature of the furnace top gas.

[0003] Existing technologies propose a method to increase the temperature of blast furnace top gas by adjusting the oxygen enrichment rate and improving the sintering materials. However, this method reduces the smelting intensity of the blast furnace by reducing the oxygen enrichment rate. Moreover, due to the significant lag in blast furnace temperature regulation, repeated adjustments are made after adjusting the blast furnace top gas temperature due to insufficient assessment of the lag, resulting in excessive top temperature and energy waste. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that cause the loss of smelting intensity when increasing the temperature of the blast furnace top gas and the insufficient judgment of the blast furnace lag, so as to provide a method and application for increasing the temperature of the blast furnace top gas, which can not lose the smelting intensity of the blast furnace, and at the same time avoid the problem of excessive furnace top temperature caused by adjustment, resulting in energy waste.

[0005] The present invention provides a method for increasing the temperature of blast furnace top gas, comprising: S1, real-time monitoring of the blast furnace top temperature, adjusting the blast furnace top temperature if it does not meet the standard, and stopping the adjustment for blast furnace top temperatures that meet the standard; S2, when the adjustment time is greater than the lag time, repeating step S1 until the temperature of the blast furnace top meets the standard.

[0006] The adjustment time is the time difference between the current temperature measurement time and the start of the adjustment, and the lag time is the time difference between the moment when the furnace top temperature reaches the target after each adjustment method takes effect in historical data and the moment when the adjustment action begins.

[0007] Preferably, the lag time of each adjustment method is the time difference between the start of the adjustment action of the adjustment method and the blast furnace top temperature reaching the standard in the historical data, and the average value of multiple data of each adjustment method in the historical data is taken as the lag time of the adjustment method.

[0008] Step S1 further includes a step of selecting a requisition method, which is as follows:

[0009] When the furnace temperature meets the standard and the central gas flow index is less than or equal to 15, the adjustment method is upper adjustment;

[0010] When the furnace temperature is below 0.3% and the central gas flow index is greater than 15 and less than 25, the adjustment method is lower adjustment;

[0011] When the furnace temperature is below 0.3% and the central gas flow index is less than or equal to 15, the adjustment method is to adjust both the upper and lower parts simultaneously.

[0012] Preferably, the furnace temperature is the weight percentage of silicon (Si) content in the molten metal in the blast furnace;

[0013] This invention sets a standard for the central gas flow index. If the central gas flow index is between 15 and 25, the central gas flow index of the blast furnace is determined to meet the standard. If the edge gas flow index is between 0.7 and 1.0, the edge gas flow index of the blast furnace is determined to meet the standard. If both the central gas flow index and the edge gas flow index of the blast furnace meet the standard, then the central gas flow of the blast furnace reaches the standard of being strong.

[0014] Preferably, the upper adjustment method includes at least one of adjusting the coke discharge position, adjusting the weight ratio of high-quality coke at the center of the blast furnace, adjusting the material distribution matrix, or increasing the ore batch.

[0015] When the coke in the blast furnace is a combination of high-quality and low-quality coke, the upper adjustment method is at least one of adjusting the coke discharge position or adjusting the weight ratio of high-quality coke in the center of the blast furnace.

[0016] When the coke type of the blast furnace is a single type of coke, the upper adjustment method is to increase the ore batch or adjust the material distribution matrix by at least one of the following:

[0017] Optionally, when the blast furnace condition is stable, the upper adjustment method is to increase the ore batch;

[0018] Optionally, the amount of ore batches adjusted at one time can be increased by 3-5t until the material rate drops to less than or equal to 5.0.

[0019] Optionally, when the blast furnace condition is unstable, the upper adjustment method is to adjust the charging matrix.

[0020] Preferably, high-quality coke is dry coke or grade 1 coke, while low-quality coke is wet coke or grade 2 coke.

[0021] Preferably, stable furnace conditions refer to uniform and active operation of the furnace hearth, reasonable and stable gas flow distribution, stable voltage, air pressure, pressure difference, and permeability index at reasonable levels, and uniform and smooth material feeding.

[0022] The specific steps for adjusting the discharge position of coke are as follows: high-quality coke is fed into the blast furnace at the center and / or near the center, while low-quality coke is fed into the blast furnace at the edge.

[0023] The weight ratio of high-quality coke in the center of the blast furnace is adjusted such that the proportion of high-quality coke in the center of the blast furnace increases by 4-6% in a single adjustment. Preferably, the total increase in the weight ratio of high-quality coke in the center of the blast furnace is 25-50%.

[0024] Preferably, when choosing to adjust the discharge position of coke or the weight ratio of high-quality coke in the center of the blast furnace, priority should be given to checking whether there is room for optimization of the discharge position of coke. If there is room for adjustment of the discharge position of coke, then the optimization of the discharge position of coke should be given priority. If the effect is not achieved after the discharge position of coke is optimized, then the weight ratio of high-quality coke in the center position should be increased for further adjustment.

[0025] The method of adjusting the fabric matrix is ​​at least one of the following: increasing the amount of ore-blocking coke, increasing the proportion of ore-blocking coke, increasing the amount of center coke, and increasing the proportion of center coke.

[0026] Optionally, the amount of coke added during a single adjustment is 1-3 cycles;

[0027] Optionally, the increase in the proportion of ore-blocking coke in a single adjustment is 4.75-5%, and preferably, the total increase in the proportion of ore-blocking coke is less than or equal to 35%.

[0028] Optionally, the center coke can be increased by 1-3 revolutions per adjustment.

[0029] Optionally, the proportion of coke in a single adjustment can be increased by 4-5%.

[0030] Preferably, the central coke refers to the coke in the coke distribution matrix with an inclination angle of less than 20°; the ore-blocking coke refers to the coke on the inner side of the ore platform in the distribution matrix, that is, all coke except the central coke is ore-blocking coke.

[0031] The lower adjustment method is based on the difference ΔT2 between the current temperature at the blast furnace top and the lower limit standard temperature T2, combined with empirical formulas to adjust the blast volume V. B Moisture content W B Blower air temperature T B Air outlet area S f , blowing coal powder P C At least one of the following is adjusted, and the empirical formula is |ΔT2|=0.045×ΔV B -0.8×ΔW B +0.30×ΔT B +58×ΔS f +0.5×ΔP C , where ΔV B ΔW represents the increase in air volume. B ΔT represents the decrease in moisture content. B ΔS represents the increase in blower air temperature. f ΔP represents the increase in air vent area. C This is to increase the amount of pulverized coal.

[0032] The lower adjustment method is to reduce the coke load and increase the furnace temperature to 0.4%-0.6%;

[0033] Optionally, the single adjustment amount for reducing coke load is 0.1-0.5.

[0034] In step S1, the blast furnace top temperature status is determined by obtaining the difference ΔT2 between the blast furnace top temperature and the lower limit standard temperature T2. When ΔT2 < 0, it is determined that the current blast furnace top temperature is too low and does not meet the standard.

[0035] Optionally, the lower limit standard temperature T2 is 120-140℃;

[0036] Preferably, the lower limit standard temperature is 120°C and the upper limit standard temperature is 200°C.

[0037] The current temperature of the blast furnace top is the average of the temperatures at multiple locations on the blast furnace top.

[0038] The central gas flow index of the blast furnace is the ratio of the sum of the temperatures at and / or near the center of the blast furnace throat to the average temperature of the throat.

[0039] This invention provides a method for increasing the temperature of blast furnace top gas, which can be applied to smelting technology or to improving the operating rate of TRT power generation.

[0040] The technical solution of this invention has the following advantages:

[0041] 1. The method for increasing the temperature of blast furnace top gas provided by the present invention includes: real-time monitoring of the blast furnace top temperature; adjusting the blast furnace top temperature if it does not meet the standard; stopping the adjustment for blast furnaces with top temperatures that meet the standard; repeating step S1 until the temperature of the blast furnace top meets the standard when the adjustment time is greater than the lag time; wherein, the adjustment time is the time difference between the current temperature measurement time and the start time of the adjustment, and the lag time is the time difference between the time when the top temperature reaches the standard after each adjustment method takes effect in historical data and the start time of the adjustment action. The present invention analyzes and statistically determines the reaction lag time of each adjustment method using a large amount of actual historical data during the adjustment process of the blast furnace, obtaining an accurate lag time. Through subsequent practical work, the historical data information is continuously enriched, making the obtained lag time more accurate. This allows for accurate determination of whether the adjustment to increase the blast furnace top gas temperature needs to be repeated, avoiding insufficient judgment of the lag time of the adjustment, resulting in repeated adjustments and causing excessive top temperature and energy waste. This invention compares the difference between the current temperature measurement time and the time at the start of the adjustment with the lag time. This avoids the problem of excessively high furnace top temperature caused by repeated adjustments due to the lag of the blast furnace, which can result in inaccurate judgment of whether further adjustment is needed when the adjustment time is too short, thus avoiding energy waste.

[0042] 2. The method for increasing the top gas temperature of a blast furnace provided by this invention further includes selecting the adjustment method for the blast furnace by determining whether the central gas flow index and furnace temperature of the blast furnace meet the standards. This invention selects the adjustment method based on a comprehensive evaluation of the central gas flow index and furnace temperature. When the blast furnace temperature meets the standards but the central gas flow index is low, the central gas flow index is improved through upper adjustment, thereby increasing the blast furnace top temperature. When the central gas flow index meets the standards but the blast furnace temperature is low, the lower furnace temperature is improved through lower adjustment, increasing the overall temperature distribution of the blast furnace and thus increasing the blast furnace top temperature. When both the furnace temperature and the central gas flow index are low, a combination of upper and lower adjustment is used to improve the lower furnace temperature, increasing the overall temperature distribution of the blast furnace, while simultaneously improving the central gas flow index, thus comprehensively increasing the blast furnace top temperature.

[0043] This invention divides the blast furnace throat into several regions, determines the blast furnace center gas flow index based on the temperature at or near the center point of the throat, and determines the edge gas flow index based on the temperature of the edge region of the throat, in order to determine whether the blast furnace top gas flow reaches a strong standard, and further determine the adjustment method of the upper and lower agents.

[0044] 3. The method for increasing the temperature of blast furnace top gas provided by this invention includes a specific method for adjusting the upper and lower parts of the blast furnace. The upper adjustment method includes at least one of the following: adjusting the coke discharge position, adjusting the weight ratio of high-quality coke in the center of the blast furnace, adjusting the charging matrix, or increasing the ore batch. For blast furnaces using a mixture of high-quality and low-quality coke, coke can be fed into the furnace separately according to quality, with high-quality coke distributed in the center and low-quality coke distributed at the edges. Alternatively, the top temperature can be increased by increasing the weight ratio of high-quality coke in the center of the blast furnace. By gradually increasing the ore batch to above the critical point, the material rate can be reduced to below 5.0. The charging matrix can also be adjusted by increasing the ore-blocking coke ratio, the proportion of ore-blocking coke, and the proportion of central coke, thereby raising the top temperature to above 120-140℃.

[0045] The method for adjusting the lower part of the furnace includes calculating the difference between the actual top temperature and the target top temperature. Adjustments are then made by selecting one or more of the following parameters according to empirical formulas: air volume, humidity, blast air temperature, tuyeres area, and pulverized coal injection. This allows for accurate control of the types and ranges of adjustment parameters, thereby preventing excessively high furnace top temperatures and the waste of heat within the furnace. This invention uses historical data and a multivariate linear programming method to derive empirical formulas for lower-level adjustment, accurately determining the adjustment amounts for each condition and raising the furnace temperature above the standard value. Attached Figure Description

[0046] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0047] Figure 1 This is a flowchart of a method for increasing the temperature of blast furnace top gas according to an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the blast furnace riser pipe layout in an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the cross-shaped temperature measurement area in the blast furnace throat according to an embodiment of the present invention. Detailed Implementation

[0050] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0051] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0052] Because blast furnaces exhibit significant lag, the time interval between changes in the top gas temperature after upper and lower adjustments is unclear. This can easily lead to insufficient judgment of the adjustment lag by operators, resulting in repeated adjustments and excessive top temperature and energy waste. Therefore, this invention collects the action time of upper and lower adjustments and the time it takes for the top temperature to reach the standard, calculates the time difference between the two, and stores it in historical data. The stored historical data is then used to statistically determine the reaction lag time for each adjustment method. Specifically, the statistical method involves calculating the lag time from adjustment to effectiveness based on the average value of historical data. The lag times for each adjustment method are shown in Table 1. If multiple adjustment methods are selected for a single increase in the blast furnace top gas temperature, the longest lag time should be used as the adjustment lag time.

[0053] Table 1. Lag Time of Each Adjustment Method

[0054]

[0055] Therefore, refer to Figure 1 As shown, this embodiment of the invention monitors the blast furnace top temperature in real time. When the top temperature is lower than the lower limit standard temperature, it determines that the blast furnace needs adjustment. If the adjustment time is greater than the lag time, and the top temperature is still lower than the lower limit standard temperature, a second adjustment is performed. If the top temperature is higher than the lower limit standard temperature, the adjustment is stopped, and real-time monitoring of the blast furnace top temperature continues. This avoids situations where the effective adjustment time cannot be determined after the adjustment, resulting in repeated adjustments (if the blast furnace top temperature is lower than the lower limit standard temperature when the adjustment time is less than the lag time, although the blast furnace top temperature has not reached the standard, it is not determined that the blast furnace needs to be adjusted again. This is because of the lag in blast furnace adjustment; judging whether the blast furnace needs to be adjusted again based solely on the top temperature after adjustment is inaccurate. Therefore, a comprehensive judgment based on both the blast furnace top temperature and the adjustment time is accurate), excessive top temperature, and wasted resources.

[0056] See Figure 2 As shown, this is a schematic diagram of the blast furnace top riser layout in an embodiment of the present invention. The blast furnace is divided into four directions: northwest, northeast, southeast, and southwest. The blast furnace top temperature T is obtained by taking the average value of the top temperature in the four directions and then applying equation (1). 平 ,

[0057] T 平 =(T西北 + T 东南 + T 东北 + T 西南 ) / 4 (1),

[0058] Among them, T 西北 Temperature T in the northwest direction of the blast furnace 东南 The temperature (T) in the southeast direction of the blast furnace 东北 Temperature T in the northeast direction of the blast furnace 西南 This refers to the temperature southwest of the blast furnace.

[0059] The charging process in a blast furnace proceeds from the furnace wall to the center of the throat. The blast furnace throat is divided into several equal parts according to the principle of equal area. The total number of equal parts varies depending on the size of the blast furnace throat. The edge of the blast furnace generally refers to the ring near the furnace wall (accounting for approximately 0-20% of the entire throat area), while the central area refers to the ring near the center of the blast furnace (also accounting for approximately 20% of the entire throat area).

[0060] See Figure 3 The diagram shown is a schematic diagram of the cross-shaped temperature measurement area in the blast furnace throat according to an embodiment of the present invention. The diagram illustrates the division of the blast furnace throat into seven areas. The central area consists of the area formed by the center position o and the areas near the center positions a, b, c, and d. The edge areas consist of the areas formed by the edge positions v, w, x, y and z, A, B, and D.

[0061] The central gas flow index Z and the edge gas flow index W of the blast furnace are calculated according to formulas (2) and (3), where Z is the central gas flow index of the blast furnace, To is the temperature of the blast furnace throat at the center position, Ta is the temperature near the center position a, Tb is the temperature near the center position b, Tc is the temperature near the center position c, Td is the temperature near the center position d, and T... 喉平 denoted as the average throat temperature, W as the central gas flow index of the blast furnace, Tv as the temperature at throat edge position v, Tw as the temperature at throat edge position w, Tx as the temperature at throat edge position x, and Ty as the temperature at throat edge position y.

[0062] Z = (To + Ta + Tb + Tc + Td) / T 喉平 (2)

[0063] W=(Tv+Tw+Tx+Ty) / (4×T 喉平 (3)

[0064] Example 1

[0065] This embodiment provides a method for increasing the temperature of blast furnace top gas, and the specific steps and methods are as follows:

[0066] Step 11, refer to Figure 2 As shown, the furnace top temperature was obtained from four directions: 105℃ in the northeast direction, 110℃ in the northwest direction, 102℃ in the southeast direction, and 110℃ in the southwest direction. The average furnace top temperature T was then calculated. 平 The temperature is 107℃, and the difference between this and the lower limit standard temperature T2, which is 120℃, is ΔT2 = -13℃. This means that the current blast furnace top temperature is too low, below the lower limit temperature of 120℃, so the blast furnace needs to be adjusted.

[0067] See Figure 3 As shown, the temperature at each position of the cross temperature measurement area of ​​the blast furnace throat is obtained. According to formulas (2) and (3), the central gas flow index of the blast furnace in this embodiment is 13.2 and the edge gas flow index of the blast furnace is 0.6. It can be seen that the central gas flow index of this embodiment is less than the standard value of the central gas flow index of 15. At this time, the furnace temperature is 0.45%, which is greater than the standard value of the furnace temperature of 0.3%. The central gas flow index does not meet the standard, but the furnace temperature meets the standard. Therefore, the upper adjustment of the blast furnace in this embodiment is carried out. Since the blast furnace in this embodiment adopts a combination of high-quality coke and low-quality coke, the coke discharge method is to discharge high-quality coke first and then low-quality coke. Therefore, there is room for optimization in the coke discharge position. Therefore, the upper adjustment is carried out by adjusting the coke discharge position. The specific steps are to use a distributor to discharge low-quality coke from the bottom of the hopper first and distribute it in the edge area of ​​the blast furnace. Then, high-quality coke is discharged from the bottom of the hopper last and distributed in the center area of ​​the blast furnace.

[0068] Step 12: After the adjustment begins, the blast furnace top temperature continues to be monitored in real time. When the difference between the current temperature measurement time and the start time of this (optimized discharge position) adjustment is greater than the lag time of 6 hours, the real-time monitoring shows that the blast furnace top temperature is 115℃. The top temperature is still lower than the lower limit standard temperature value of the blast furnace top, that is, the adjustment time is greater than the lag time. At this time, the top temperature still does not meet the standard, so a second adjustment is performed on the blast furnace. This adjustment is carried out by increasing the weight ratio of high-quality coke at the center of the blast furnace top for upper adjustment. In this embodiment, the initial proportion of high-quality coke in the blast furnace is... The ratio is 20%. According to the single adjustment of 5%, the weight ratio of high-quality coke is increased to 25%. The blast furnace top temperature is monitored in real time. When the difference between the current temperature measurement time and the start time of this adjustment (increasing the proportion of high-quality coke in the center) is greater than the lag time of 6, the average top temperature of the blast furnace is 130℃, which has reached the lower limit standard temperature value. The adjustment is stopped. At this time, the edge gas flow index of the blast furnace is 0.8 and the center gas flow index is 18.0. It is determined that the blast furnace top temperature meets the standard and enters the normal top temperature monitoring stage.

[0069] Example 2

[0070] This embodiment provides a method for increasing the temperature of blast furnace top gas, and the specific steps and methods are as follows:

[0071] Step 21: Obtain the furnace top temperature in four directions respectively. The top temperature of the riser pipe in the northeast direction is 102℃, the top temperature of the riser pipe in the northwest direction is 105℃, the top temperature of the riser pipe in the southeast direction is 100℃, and the top temperature of the riser pipe in the southwest direction is 103℃. According to formula (1), the average furnace top temperature is 103℃. The difference between the average furnace top temperature and the lower limit standard temperature T2, i.e., 120℃, is ΔT2 = -17℃. That is, the current furnace top temperature is too low and does not meet the standard. Therefore, the blast furnace needs to be adjusted.

[0072] See Figure 3 The temperatures at various locations within the cross-shaped temperature measurement area of ​​the blast furnace throat were obtained. Based on formulas (2) and (3), the central gas flow index of the blast furnace in this embodiment was calculated to be 12.5, and the edge gas flow index was 0.75. At this point, the blast furnace temperature was 0.51%, which is greater than the standard furnace temperature of 0.3%. Therefore, the central gas flow index of this embodiment does not meet the standard, while the furnace temperature does. Thus, upper adjustments were made to the blast furnace in this embodiment. Since this embodiment uses a single type of coke, the original charging matrix of the blast furnace is shown below.

[0073]

[0074] The original blast furnace charging matrix described above is as follows: when the charging device is tilted at 39°, it rotates 3 times to feed coke into the blast furnace; when the charging device is tilted at 37°, it rotates 3 times to feed coke into the blast furnace; when the charging device is tilted at 35°, it rotates 3 times to feed coke into the blast furnace; when the charging device is tilted at 31°, it rotates 2 times to feed coke into the blast furnace; when the charging device is tilted at 28°, it rotates 2 times to feed coke into the blast furnace; and when the charging device is tilted at 26°, it rotates 3 times to feed coke into the blast furnace. The ore distribution matrix is ​​as follows: when the blast furnace is tilted at 39°, the blast furnace distributor rotates 3 times to feed ore into the furnace; when the blast furnace is tilted at 37°, the blast furnace distributor rotates 3 times to feed ore into the furnace; when the blast furnace is tilted at 35°, the blast furnace distributor rotates 2 times to feed ore into the furnace; when the blast furnace is tilted at 31°, the blast furnace distributor rotates 2 times to feed ore into the furnace; when the blast furnace is tilted at 28°, the blast furnace distributor rotates 2 times to feed ore into the furnace.

[0075] As can be seen from the above fabric matrix, the coke fabric distribution system at 26° has 3 rings of coke blocking, and the proportion of coke blocking is 18.75%, which is too low and there is room for adjustment. Therefore, the upper adjustment method in this embodiment is to add one ring of coke blocking, that is, to set 4 rings of coke blocking at the 26° fabric distribution system, and increase the proportion of coke blocking to 23.5%.

[0076] Step 22: After the adjustment begins, continue to monitor the blast furnace top temperature in real time. When the difference between the current temperature measurement time and the start time of this adjustment (increasing the proportion of ore and coke) is greater than 6 hours, the current blast furnace top temperature is measured to be 113℃, which is still lower than the lower limit temperature standard of the blast furnace top. Then repeat step 21 to further increase the proportion of ore and coke, and monitor the blast furnace top temperature in real time again. When the difference between the current temperature measurement time and the start time of this adjustment (increasing the proportion of ore and coke) is greater than 6 hours, the average top temperature of the blast furnace is measured to be 135℃. The blast furnace top temperature meets the standard, the adjustment is stopped, and the normal top temperature monitoring stage begins.

[0077] Example 3

[0078] This embodiment provides a method for increasing the temperature of blast furnace top gas, and the specific steps and methods are as follows:

[0079] Step 31: Obtain the furnace top temperature in four directions. The top temperature of the riser pipe in the northeast direction is 102℃, the top temperature of the riser pipe in the northwest direction is 105℃, the top temperature of the riser pipe in the southeast direction is 100℃, and the top temperature of the riser pipe in the southwest direction is 103℃. The average furnace top temperature is calculated to be 103℃. The difference between this average temperature and the lower limit standard temperature T2, which is 120℃, is ΔT2 = -17℃. Therefore, the current furnace top temperature is too low and does not meet the standard. Thus, the blast furnace needs to be adjusted.

[0080] See Figure 3 The temperatures at each location in the cross temperature measurement area of ​​the blast furnace throat are obtained. According to formulas (2) and (3), the central gas flow index of the blast furnace in this embodiment is 11.6 and the edge gas flow index is 0.57. At this time, the furnace temperature is 0.53%, which is greater than the furnace temperature standard of 0.3%. It can be seen that the central gas flow index of this embodiment does not meet the standard, but the furnace temperature does meet the standard. Therefore, the upper part of the blast furnace in this embodiment is adjusted. Since the blast furnace in this embodiment uses a single coke, the original charging matrix of the blast furnace is as follows:

[0081]

[0082] The original blast furnace charging matrix described above is as follows: when the charging device is tilted at 44°, it rotates 3 times to feed coke into the blast furnace; when the charging device is tilted at 42°, it rotates 3 times to feed coke into the blast furnace; when the charging device is tilted at 39°, it rotates 2 times to feed coke into the blast furnace; when the charging device is tilted at 36°, it rotates 2 times to feed coke into the blast furnace; when the charging device is tilted at 33°, it rotates 2 times to feed coke into the blast furnace; and when the charging device is tilted at 12°, it rotates 2 times to feed coke into the blast furnace. The ore distribution matrix is ​​as follows: when the ore distributor is tilted at 44°, it rotates twice to feed ore into the blast furnace; when the ore distributor is tilted at 39°, it rotates three times to feed ore into the blast furnace; when the ore distributor is tilted at 36°, it rotates twice to feed ore into the blast furnace; when the ore distributor is tilted at 33°, it rotates twice to feed ore into the blast furnace.

[0083] It is known that there are two rings of central coke at the 12° coke distribution system, and the proportion of central coke is 14.3%, which is too low. Therefore, the upper adjustment method in this embodiment is to add one ring of central coke, that is, to set three rings of central coke at the 12° coke distribution system, and increase the proportion of central coke to 20%.

[0084] Step 32: Continue to monitor the blast furnace top temperature in real time. When the difference between the current temperature measurement time and the start time of this adjustment (adding center coke) is greater than 6 hours, the current measured temperature of the blast furnace top is 132℃. The blast furnace top temperature is higher than the lower limit standard temperature, so the adjustment is stopped. At this time, the central gas flow index of the blast furnace is 20.1, and the normal furnace top temperature monitoring stage begins.

[0085] Example 4

[0086] This embodiment provides a method for increasing the temperature of blast furnace top gas, and the specific steps and methods are as follows:

[0087] Step 41: Obtain the furnace top temperature from four directions respectively. The average furnace top temperature is calculated to be 104℃. The difference between this average and the lower limit standard temperature T2 (120℃) is ΔT2 = -13℃. Therefore, the current furnace top temperature is too low and does not meet the standard. Thus, the blast furnace needs to be adjusted.

[0088] See Figure 3 The temperature of each position in the cross temperature measurement area of ​​the blast furnace throat was obtained. According to formulas (2) and (3), the central gas flow index of the blast furnace in this embodiment was calculated to be 13.2 and the edge gas flow index was 0.8. The furnace temperature was 0.47%. It can be seen that the furnace temperature of the blast furnace in this embodiment meets the standard, but the central gas flow index does not meet the standard. Therefore, the upper adjustment of the blast furnace in this embodiment is carried out. Since the blast furnace in this embodiment adopts belt feeding and the volume of the material tank is large, under the premise of stable air volume, the ore batch is increased from 70t to 75t and the material speed is reduced from 6.85 to 6.39.

[0089] Step 42: Continue to monitor the blast furnace top temperature in real time. If the difference between the current temperature measurement time and the start time of this adjustment (increasing the ore batch) is greater than 6 hours, and the current measured blast furnace top temperature is 108℃, which is still lower than the lower limit standard temperature of 120℃, Step 41 needs to be repeated for a second adjustment. That is, increase the ore batch by 5t again, from 75t to 80t, and reduce the feed rate from 6.39 to 5.99. Continue to monitor the blast furnace top temperature in real time. When the difference is greater than the lag time of 6 hours, the current measured blast furnace top temperature is 112℃, which is still lower than the lower limit standard temperature of the blast furnace top. Step 41 is repeated three times, and the ore batch is increased by 5t again until the ore batch is increased to 85t. When the material rate drops to 5.33, the difference between the current temperature measurement time and the time when this adjustment starts is greater than the lag time of 6 hours. The blast furnace top temperature is 123℃, which is higher than the lower limit standard temperature of the blast furnace top. The blast furnace top temperature meets the standard, the adjustment is stopped, and the normal furnace top temperature monitoring stage begins.

[0090] Example 5

[0091] This embodiment provides a method for increasing the temperature of blast furnace top gas, and the specific steps and methods are as follows:

[0092] Step 51: Obtain the furnace top temperature from four directions. The average furnace top temperature is 107℃. The difference between this average and the lower limit standard temperature T2 (120℃) is ΔT2 = -13℃. Therefore, the current furnace top temperature is too low and does not meet the standard. Thus, the blast furnace needs to be adjusted.

[0093] See Figure 3 The temperatures at various locations in the cross-shaped temperature measurement area of ​​the blast furnace throat were obtained. According to equations (2) and (3), the central gas flow index of the blast furnace in this embodiment was calculated to be 21.5 and the edge gas flow index was 0.83. At this time, the Si content in the molten iron was only 0.2%, that is, the furnace temperature was below 0.3%. It can be seen that the central gas flow index of this embodiment meets the standard, but the furnace temperature does not meet the standard. Therefore, the lower part of the blast furnace in this embodiment is adjusted. In this embodiment, the air volume V is selected. B The adjustment is carried out at the lower level. According to the formula, |ΔT2|=0.045×ΔV B ΔV B =288.9 Nm 3 / min, that is, increasing the air volume in this embodiment by 288.9 Nm. 3 / min.

[0094] Step 52: After the adjustment begins, the blast furnace top temperature continues to be monitored in real time. When the difference between the current temperature measurement time and the start time of this (increased air volume) adjustment is greater than 3 hours, the average top temperature of the blast furnace is 135℃, the edge gas flow index is 0.8, the center gas flow index is 19.8, the Si content in the molten iron is 0.35%, the blast furnace top temperature meets the standard, the adjustment is stopped, and the normal top temperature monitoring stage begins.

[0095] Example 6

[0096] This embodiment provides a method for increasing the temperature of blast furnace top gas, and the specific steps and methods are as follows:

[0097] Step 61: Obtain the furnace top temperature from four directions respectively. The average furnace top temperature is 105℃. The difference between the average furnace top temperature and the lower limit standard temperature T2, which is 120℃, is ΔT2 = -15℃. That is, the current furnace top temperature is too low and does not meet the standard. Therefore, the blast furnace needs to be adjusted.

[0098] See Figure 3 The temperatures at various locations in the cross temperature measurement area of ​​the blast furnace throat were obtained. According to equations (2) and (3), the central gas flow index of the blast furnace in this embodiment was calculated to be 23.3 and the edge gas flow index was 0.76. It can be seen that the central gas flow index of 23.3 in this embodiment meets the standard, but the Si content in the molten iron of the blast furnace is 0.17%, which is too low. Therefore, the lower part of the blast furnace in this embodiment is adjusted. In this embodiment, the tuyeres area S is selected. f Japanese wind temperature T B Adjustments were made to the lower part, and the air outlet area S f and blower air temperature T B The increase satisfies the formula |ΔT2|=58×ΔS f +0.30×ΔT B Thus, in this embodiment, ΔS is obtained. f =0.077m 2 ΔT B =35℃, that is, the air outlet area in this embodiment is increased by 0.077m². 2 The blower air temperature increases by 35°C.

[0099] Step 62: Continue to monitor the blast furnace top temperature in real time. When the difference between the current temperature measurement time and the start time of this adjustment (increasing the tuyeres area and blast temperature) is greater than 3 hours (the lag time for tuyeres area adjustment is 2-3 hours, and there is no lag time for blast temperature adjustment, so the longest lag time is set as the lag time, which is 3 hours in this embodiment), at this time, the average top temperature of the blast furnace is 123℃, the edge gas flow index of the blast furnace is 0.8, the center gas flow index is 19.8, the Si content in the molten iron of the blast furnace increases to 0.41%, the blast furnace top temperature meets the standard, the adjustment is stopped, and the normal top temperature monitoring stage begins.

[0100] Example 7

[0101] This embodiment provides a method for increasing the temperature of blast furnace top gas, and the specific steps and methods are as follows:

[0102] Step 71: Obtain the furnace top temperature from four directions. The average furnace top temperature is 98℃. The difference between this average and the lower limit standard temperature T2 (120℃) is ΔT2 = -22℃. Therefore, the current furnace top temperature is too low and does not meet the standard. Thus, the blast furnace needs to be adjusted.

[0103] See Figure 3 The temperatures at various locations in the cross-shaped temperature measurement area of ​​the blast furnace throat were obtained. According to equations (2) and (3), the central gas flow index of the blast furnace in this embodiment was calculated to be 18 and the edge gas flow index was 0.76. At this time, the Si content in the molten iron was 0.17%, and the furnace temperature was below 0.3%. It can be seen that the central gas flow index of this embodiment meets the standard, but the furnace temperature does not meet the standard. Therefore, the lower part of the blast furnace in this embodiment is adjusted. In this embodiment, pulverized coal P is selected. C Moisture content W B Air volume V B Adjustments were made to lower-level adjustments, and pulverized coal was blown into the atmosphere. C Moisture content W B Air volume V B The increase satisfies the formula |ΔT2|=0.045×ΔV B -0.8×ΔW B +0.5×ΔP C Thus, in this embodiment, ΔV is obtained. B =177.8Nm 3 / min, ΔW B =-10g / m 3 , △P C =12t / h, that is, the increase in pulverized coal volume P in this embodiment is... C 12t / h, moisture reduction 10g / m³ 3 The increase in air volume is 177.8 Nm. 3 / min.

[0104] Step 72: Continue to monitor the blast furnace top temperature in real time. When the difference between the current temperature measurement time and the start time of this adjustment (increasing pulverized coal, reducing moisture, and increasing air volume) is greater than 3 hours, the average top temperature of the blast furnace is 135℃, the edge gas flow index is 0.8, the center gas flow index is 19.8, the Si content in the molten iron increases to 0.41%, the blast furnace top temperature meets the standard, the adjustment is stopped, and the normal top temperature monitoring stage begins.

[0105] Example 8

[0106] This embodiment provides a method for increasing the temperature of blast furnace top gas, and the specific steps and methods are as follows:

[0107] Step 81: Obtain the furnace top temperature from four directions. The average furnace top temperature is 118℃. The difference between this average and the lower limit standard temperature T2 (140℃) is ΔT2 = -22℃. Therefore, the current furnace top temperature is too low and does not meet the standard. Thus, the blast furnace needs to be adjusted.

[0108] See Figure 3 The temperature of each position in the cross temperature measurement area of ​​the blast furnace throat is obtained. According to formulas (2) and (3), the central gas flow index of the blast furnace in this embodiment is 19.1 and the edge gas flow index of the blast furnace is 0.75. It can be seen that the central gas flow index of this embodiment meets the standard. However, the Si content in the molten iron of the blast furnace is 0.21%, which is 0.3% lower than the furnace temperature standard. The lower part of the blast furnace in this embodiment is adjusted. The lower part of the blast furnace in this embodiment is adjusted by reducing the coke load of the blast furnace. Specifically, the coke load of the blast furnace is reduced from 5.0 to about 4.5, and the coke ratio is increased from 350kg / t to 380kg / t.

[0109] Step 82: Continue to monitor the blast furnace top temperature in real time. When the difference between the current temperature measurement time and the start time of this adjustment (reducing the blast furnace coke load) is greater than 6 hours, the average top temperature of the blast furnace is 135℃, the central gas flow index is 20.5, the Si content in the blast furnace hot metal increases to about 0.57%, the blast furnace top temperature meets the standard, the adjustment is stopped, and the normal top temperature monitoring stage begins.

[0110] Example 9

[0111] This embodiment provides a method for increasing the temperature of blast furnace top gas, and the specific steps and methods are as follows:

[0112] Step 91: Obtain the furnace top temperature from four directions. The average furnace top temperature is 105℃. The difference between this average and the lower limit standard temperature T2 (120℃) is ΔT2 = -12℃. Therefore, the current furnace top temperature is too low and does not meet the standard. Thus, the blast furnace needs to be adjusted.

[0113] See Figure 3 The temperatures at various locations in the cross temperature measurement area of ​​the blast furnace throat were obtained. According to formulas (2) and (3), the central gas flow index of the blast furnace in this embodiment was calculated to be 13.1 and the edge gas flow index was 0.63. Moreover, the Si content in the molten iron of the blast furnace was 0.23%, that is, the furnace temperature was lower than 0.3%. It can be seen that the central gas flow index and the furnace temperature of this embodiment do not meet the standard. Therefore, the upper and lower adjustment methods were combined for the blast furnace in this embodiment. It is known that the blast furnace in this embodiment uses a single coke and the furnace condition is unstable. In the blast furnace charging matrix, the proportion of central coke is 14.4%. Therefore, the upper adjustment method is to optimize the charging matrix. Specifically, the upper adjustment method is to increase the weight ratio of central coke by 5% for each adjustment. At the same time, the lower adjustment method of this embodiment is to reduce the coke load of the blast furnace. Specifically, the coke load of the blast furnace is reduced from 5.0 to about 4.5, and the coke ratio is increased from 355 kg / t to 376 kg / t.

[0114] Step 92: In this embodiment, multiple adjustment methods were selected, so the lag time is the longest among all adjustment methods, which is 6 hours. The blast furnace top temperature continues to be monitored in real time. When the difference between the current temperature measurement time and the start time of this adjustment (reducing coke load and increasing the proportion of central coke weight) is greater than the lag time of 6 hours, the average top temperature of the blast furnace is 135℃, the central gas flow index is 20.5, the Si content in the blast furnace hot metal increases to about 0.45%, the blast furnace top temperature meets the standard, the adjustment is stopped, and the normal top temperature monitoring stage begins.

[0115] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for increasing the temperature of blast furnace top gas, characterized in that, include, S1, monitor the top temperature of the blast furnace in real time, adjust the blast furnace whose top temperature does not meet the standard, and stop adjusting the blast furnace whose top temperature meets the standard. S2, when the adjustment time is greater than the lag time, repeat step S1 until the temperature of the blast furnace top meets the standard; The adjustment time is the time difference between the current temperature measurement time and the start time of the current adjustment, and the lag time is the time difference between the moment when the furnace top temperature reaches the standard after each adjustment method takes effect in historical data and the start time of the adjustment action. Step S1 further includes a step of selecting a requisition method, which is as follows: When the furnace temperature meets the standard and the central gas flow index is less than or equal to 15, the adjustment method is upper adjustment; When the furnace temperature is below 0.3% and the central gas flow index is greater than 15 and less than 25, the adjustment method is lower adjustment; When the furnace temperature is below 0.3% and the central gas flow index is less than or equal to 15, the adjustment method is to adjust both the upper and lower parts simultaneously. The upper adjustment method includes adjusting the coke discharge position, adjusting the weight ratio of high-quality coke in the center of the blast furnace, adjusting the charging matrix, or increasing the ore batch by at least one of the following: The weight ratio of high-quality coke in the center of the blast furnace is adjusted to increase the proportion of high-quality coke in the center by 4-6% in a single adjustment; The lower adjustment method involves adjusting at least one of the following based on the difference ΔT2 between the blast furnace top temperature and the lower limit standard temperature T2, combined with an empirical formula: |ΔT2|=0.045×ΔVB -0.8×ΔWB+0.30×ΔTB+58×ΔSf+0.5×ΔPC, where ΔVB is the increase in blast volume, ΔWB is the decrease in moisture content, ΔTB is the increase in blast temperature, ΔSf is the increase in tuyer area, and ΔPC is the increase in pulverized coal.

2. The method for increasing the temperature of blast furnace top gas according to claim 1, characterized in that, When the coke in the blast furnace is a combination of high-quality and low-quality coke, the upper adjustment method is at least one of adjusting the discharge position of the coke or adjusting the weight ratio of high-quality coke in the center of the blast furnace. And / or, when the coke type of the blast furnace is a single type of coke, the upper adjustment method is at least one of increasing the ore batch or adjusting the material distribution matrix; And / or, when the blast furnace condition is stable, the upper adjustment method is to increase the ore batch; And / or, when the furnace condition of the blast furnace is unstable, the upper adjustment method is to adjust the charging matrix.

3. The method for increasing the temperature of blast furnace top gas according to claim 2, characterized in that, The specific steps for adjusting the discharge position of coke are as follows: high-quality coke is fed into the furnace at the center and / or near the center of the blast furnace, and low-quality coke is fed into the furnace at the edge of the blast furnace. And / or, the method of adjusting the fabric matrix is ​​at least one of increasing the ore-blocking coke, increasing the proportion of ore-blocking coke, increasing the central coke, and increasing the proportion of central coke.

4. The method for increasing the temperature of blast furnace top gas according to claim 3, characterized in that, The total increase in the weight proportion of high-quality coke in the center of the blast furnace is 25-50%.

5. The method for increasing the temperature of blast furnace top gas according to claim 3 or 4, characterized in that, The amount of ore added in a single adjustment is 3-5t, until the material rate drops to less than or equal to 5.0; And / or, the amount of coke added in a single adjustment is 1-3 cycles; And / or, the increase in the proportion of ore-blocking coke in a single adjustment is 4.75-5%; And / or, the increase in center focus for a single adjustment is 1-3 revolutions; And / or, the increase in the proportion of center coke in a single adjustment is 4-5%.

6. The method for increasing the temperature of blast furnace top gas according to claim 5, characterized in that, The total increase in the proportion of coke from ore is less than or equal to 35%.

7. The method for increasing the temperature of blast furnace top gas according to claim 5, characterized in that, The lower adjustment method is to reduce the coke load and increase the furnace temperature to 0.4%-0.6%.

8. The method for increasing the temperature of blast furnace top gas according to claim 7, characterized in that, The single adjustment amount for reducing coke load is 0.1-0.

5.

9. The method for increasing the temperature of blast furnace top gas according to claim 1, characterized in that, In step S1, the blast furnace top temperature status is determined by obtaining the difference ΔT2 between the blast furnace top temperature and the lower limit standard temperature T2. When ΔT2 < 0, it is determined that the current blast furnace top temperature is too low and does not meet the standard. And / or, the lower limit standard temperature T2 is 120-140℃; And / or, the top temperature of the blast furnace is the average of the temperatures at multiple locations on the top of the blast furnace.

10. The method for increasing the temperature of blast furnace top gas according to claim 1, characterized in that, The central gas flow index of the blast furnace is the ratio of the sum of the temperatures at and / or near the center of the blast furnace throat to the average temperature of the throat.

11. The application of the method for increasing the temperature of blast furnace top gas according to any one of claims 1-10 in metallurgical technology or in improving the TRT power generation operating rate.

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