Converter gas recovery method and system based on gas holder capacity

Abstract

The application discloses a converter gas recovery method and system based on the capacity of a gas holder, and comprises the following steps: S1, establishing a data acquisition system to acquire data; S2, establishing characteristic curves of converter flue gas flow data and CO and O2 concentration data changing with blowing time; S3, based on the collected data and the characteristic curves, predicting whether the gas holder is full in future several smelting periods; and S4, if a full-gas-holder warning is received, performing coupling calculation and outputting start and stop CO concentrations of recovered converter gas in each furnace cycle. The application solves the problems of high-calorific-value gas holder fullness refusing to receive and diffuse, and low-calorific-value gas recovery in a traditional converter gas recovery system.

Description

Technical Field

[0001] This invention relates to the control of converter gas recovery during converter steelmaking in the iron and steel industry, and more specifically, to a method and system for converter gas recovery based on the capacity of the gas holder. Background Technology

[0002] The flue gas discharged from the converter is captured by a fume hood, cooled by vaporization and cooling ducts to recover some waste heat, and then cooled by water (steam) spraying and dust removal. After passing through a flue gas analyzer and meeting the standards, it is sent to the gas holder. Gases that do not meet the standards are released through combustion in a venting tower. Whether the gas meets the standards mainly depends on the CO and O2 concentrations. During a converter blowing cycle, the CO and O2 concentrations in the converter flue gas show phased changes: in the initial blowing stage, the CO concentration gradually increases from 0 while the O2 concentration gradually decreases; in the middle blowing stage, the CO concentration tends to level off, while the O2 concentration tends to 0; in the final blowing stage, the CO concentration gradually decreases to 0, while the O2 concentration gradually increases. Considering safety and economy, some low-calorific-value gas is released in the initial or final stages of converter blowing.

[0003] The instantaneous generation of converter gas is large. Besides the combustion and release of converter flue gas with substandard CO and O2 concentrations during the initial and final stages of blowing, insufficient user consumption of converter gas and inadequate buffering capacity of gas holders and gas pipelines often result in the combustion and release of high-calorific-value gas during the middle stages of blowing. The existing gas recovery process is rigid; when gas holders are empty, gas that meets testing standards is directly returned to the holders, regardless of its actual grade. In this situation, when the holder capacity is small, relatively high-calorific-value gas is released while relatively low-calorific-value gas is returned, resulting in a waste of high-grade resources. Currently, there is no solution to achieve a flexible approach that combines gas holder availability with user usage to allow high-calorific-value gas to enter the holders while low-calorific-value gas is released or utilized locally. Summary of the Invention

[0004] To address the aforementioned deficiencies in existing technologies, the purpose of this invention is to provide a converter gas recovery method and system based on the capacity of the gas holder, thereby solving the problems of high-calorific-value gas holder rejection and venting when full and low-calorific-value gas recovery in traditional converter gas recovery systems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] On the one hand, a converter gas recovery method based on gas holder capacity includes the following steps:

[0007] S1. Establish a data acquisition system to collect data;

[0008] S2. Establish characteristic curves of converter flue gas flow rate and CO and O2 concentration as a function of blowing time;

[0009] S3. Based on the collected data and characteristic curves, predict whether the gas holder will be full within several future smelting cycles.

[0010] S4. If a full alarm is received, perform coupled calculations and output the start and end CO concentrations of the converter gas recovered in each furnace cycle.

[0011] Preferably, in step S1, the collected data includes converter flue gas (coal gas) data, gas holder position data, compressor data, and production plan data;

[0012] The converter flue gas / gas data includes converter gas flow rate data, CO concentration data, O2 concentration data, and time data; and / or

[0013] The gas holder location data includes gas holder capacity, gas holder location, and time data; and / or

[0014] The compressor data includes flow rate and time data for each compressor; and / or

[0015] The production plan data includes the production plan for the converter corresponding to the converter gas holder and the steel grade data.

[0016] Preferably, in step S2, when establishing the characteristic curve, the start time of blowing is taken as the blowing time 0 point and the end time of blowing is taken as the end time point.

[0017] When establishing the characteristic curve, the point at which the CO concentration begins to change drastically after the start of blowing is taken as the zero point, and the point at which the CO concentration approaches zero is taken as the end point.

[0018] Preferably, in step S3, the characteristics for determining whether the gas holder is full and the number of times the gas holder is full are:

[0019]

[0020]

[0021]

[0022] In the above formula, n represents the predicted furnace number. Q represents the amount of gas that will meet the recovery standard in n future furnace cycles. full Q is the maximum capacity of the gas holder. holder To predict the gas holder position at a specific time point, For the future n-times of gas delivery to the pressurizer, q i (t) is the characteristic curve of the converter gas flow rate of heat i changing with blowing time; t i1 , t i2 The starting and ending recovery time points of the characteristic curve corresponding to the CO concentration value of the compliant gas are given, where m represents the number of operating compressors. For the compressor flow rate j, t p This refers to the time from the predicted point to the point when gas recovery stops in the nth future furnace.

[0023] Preferably, in step S3, especially when multiple converters are blowing simultaneously, the characteristics for determining whether the gas holder is full and the number of furnaces where fullness occurs are as follows:

[0024]

[0025]

[0026]

[0027] In the above formula, For the prediction of any future time point t... f The amount of gas that meets the recovery standard (before the time point when gas recovery is stopped for the nth furnace). For predicting time points from time point t f Gas delivery volume of the compressor, t i Let time point t f The time length of time t at time 0 of furnace i q For the prediction point to time point t f The length of time.

[0028] Ideally, when the predicted remaining capacity of the gas holder is ≤ 0% to 3% of the maximum capacity of the gas holder, a full warning can be issued.

[0029] Preferably, in step S3, the next 1 to 5 smelting cycles are predicted;

[0030] Predicted interval time granularity ≤ 1 blowing cycle;

[0031] A prediction is made before and after each smelting furnace charge.

[0032] Preferably, step S4 further includes the following steps:

[0033] S41. Received a full gas holder warning;

[0034] S42. Coupled calculation outputs the start and end CO concentration values ​​of the corresponding furnace gas recovery;

[0035] S43. The calculated value is output to the execution unit, and the execution unit executes the instructions.

[0036] S44. Repeat steps S41 to S43 to update the instructions;

[0037] When the gas holder is nearing full and no full gas holder warning is received, proceed with step S45:

[0038] S45. Comply with the minimum performance standard for compliant gas.

[0039] Preferably, in step S4, the output of the coupling calculation satisfies the following objective condition:

[0040]

[0041]

[0042] Preferably, in step S4, the output of the coupled calculation needs to satisfy the following constraints:

[0043]

[0044]

[0045]

[0046] q i (t′ i )≥q LDG

[0047] L i (t′ i )≥L CO

[0048] t′ i1 ≥t i1

[0049] t′ i2 ≤t i2

[0050] t′ i1 ≤t′ i ≤t′ i2

[0051] 0≤t≤t i3

[0052] In the above formula, k represents the number of times the furnace is full, and t′ i1 ,t′ i2 Let t′ be the time point of the characteristic curve corresponding to the start and end CO concentrations after optimized control of converter gas recovery in furnace i. i The characteristic curve corresponding to furnace i is between t′ i1 , t′ i2 At any point in time between, L i (t) is the characteristic curve of CO concentration in converter gas of heat i as a function of blowing time, L CO q represents the lower limit of CO concentration for compliant coal gas. LDG t′ represents the lower limit of the gas flow rate required for the gas to meet the standards. pLet k be the time interval between the time point when gas recovery is stopped and the predicted time point. To predict the amount of converter gas that meets the standard at the time when gas recovery stops from point k to k furnace, Let t be the amount of gas delivered by the compressor from the predicted point to the point where gas recovery stops in furnace k, and t be the blowing time variable of the characteristic curve. i3 Let be the time length between the blowing termination time and the time point 0 of the characteristic curve of furnace i.

[0053] Preferably, in step S4, especially when multiple converters are blowing simultaneously, the output of the coupled calculation must meet the following constraints:

[0054]

[0055]

[0056]

[0057] q i (t′ i )≥q LDG

[0058] L i (t′ i )≥L CO

[0059] t′ i1 ≥t i1

[0060] t′ i2 ≤t i2

[0061] t′ i1 ≤t′ i ≤t′ i2

[0062] 0≤t≤t i3

[0063] In the above formula, For the prediction of any future time point t′ f (Before the time point when gas recovery is stopped for the kth furnace) Qualified gas volume To predict the time from time point t to time point t′ f Gas delivery volume of the compressor, t′ i Let time point t′ f The time length of time at time point 0 of furnace i, t′ q For the prediction point to time point t′ f The length of time.

[0064] Ideally, the CO concentration adjustment for the start and end of converter gas recovery should only apply to the full-capacity generator cycle.

[0065] Ideally, the result calculated based on the target conditions and constraints corresponds to the time value of the characteristic curve that satisfies the above objectives. The optimized CO concentration values ​​for the start and end of gas recovery need to be calculated in conjunction with the characteristic curve.

[0066] Preferably, in step S3, if the cabinet is full beyond the predicted capacity, it is directly released.

[0067] When there is redundant cabinet space, the CO concentration at which converter gas recovery stops should be referenced to the lower limit of the standard CO concentration for the gas at the end of converter blowing.

[0068] Ideally, when frequent gas leaks occur due to full storage, the lower limit of CO concentration for compliant gas should be increased or the gas holder capacity should be expanded.

[0069] On the other hand, a converter gas recovery system based on gas holder capacity includes:

[0070] The data acquisition system is used to collect converter gas data, gas holder position data, compressor data, and production plan data.

[0071] The gas volume prediction unit uses collected converter gas data to establish characteristic curves of converter gas flow rate and CO / O2 in converter gas as a function of blowing time.

[0072] The gas holder prediction unit predicts the gas volume over a period of time based on gas holder location data, compressor data, and production plan data, combined with characteristic curves. When the gas volume meets the standard and exceeds the compressor output and the remaining capacity of the gas holder, a full gas holder warning is issued.

[0073] The gas recovery optimization unit performs coupled calculations based on the data acquisition system, gas volume prediction unit, and cabinet position prediction unit to determine the start and end CO concentrations of the converter gas recovered in each batch, so as to achieve the highest grade and largest amount of gas recovered under the premise that it is necessary to release the gas.

[0074] The converter gas recovery system based on gas holder capacity executes the converter gas recovery method based on gas holder capacity.

[0075] The converter gas recovery method and system based on gas holder capacity provided by this invention also have the following beneficial effects:

[0076] 1) This invention can predict the furnace batch information when a full venting occurs;

[0077] 2) This invention can reduce the problem of gas venting caused by insufficient consumption of converter gas by users, insufficient buffer capacity of gas holders and gas pipelines, especially the problem of venting of high-calorific-value gas.

[0078] 3) This invention can also be used to support the adjustment data of the compressor equipment. When the cabinet is full, the output of the compressor is increased to improve the user's consumption of converter gas and avoid the occurrence of cabinet full release. Attached Figure Description

[0079] Figure 1 This is a schematic diagram of the specific execution path of an embodiment of the converter gas recovery method of the present invention;

[0080] Figure 2 This is a characteristic curve of CO and O2 concentration in the flue gas of a converter obtained in step S2 of the converter gas recovery method of the present invention;

[0081] Figure 3 yes Figure 2 The flow rate curve of flue gas from a converter in a certain furnace for a specific batch.

[0082] Figure 4 This is a schematic diagram of the converter gas recovery system of the present invention. Detailed Implementation

[0083] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0084] Combination Figure 1 As shown, the present invention provides a converter gas recovery method based on gas holder capacity, comprising the following steps:

[0085] S1. Establish a data acquisition system to collect data;

[0086] S2. Establish characteristic curves of converter flue gas flow rate and CO and O2 concentration as a function of blowing time;

[0087] S3. Based on the collected data and characteristic curves, predict whether the gas holder will be full within several future smelting cycles.

[0088] S4. If a full alarm is received, perform coupled calculations and output the start and end CO concentrations of the converter gas recovered in each furnace cycle.

[0089] In step S1, the collected data includes converter gas data, gas holder position data, compressor data, and production plan data.

[0090] In step S1, all data are retrieved from the existing system, as shown in Table 1 below:

[0091] Table 1

[0092] Gas data <![CDATA[Data such as the gas flow rate, CO concentration, and O2 concentration of historical furnace batches changing over time;]]> Counter space data Number of gas holders, upper and lower limits of gas holder capacity, current gas holder position value, etc. Compressor data Number of compressors, compressor flow rate, etc.; Production planning data Production plans, steel grades, converter information, etc.;

[0093] In step S2, the characteristic curve is updated once a week, and is obtained by averaging the data from the most recent 100 heats of each converter and then fitting it in segments.

[0094] In step S2, the point at which the CO concentration begins to change drastically after each blowing process is designated as the 0th time point, and the point at which the CO concentration approaches 0 is designated as the end time point.

[0095] like Figure 2 It is based on the characteristic curve of CO and O2 concentration in the flue gas of a converter in a steel plant obtained in step S2.

[0096] like Figure 3 It is the flow curve of flue gas from a converter in a steel plant for a certain heat. Since the gas flow rate tends to be constant, a fixed value is used for calculation in the model.

[0097] In step S3, combining the production plan data for the next 1-5 heats, the current gas holder value, the total flow rate data of the compressor, and the characteristic curve, it is calculated whether the gas holder will be full within the next 1-5 heat smelting cycles. The calculation model is as follows:

[0098]

[0099]

[0100]

[0101] In the above formula, n represents the predicted furnace number. Q represents the amount of gas that will meet the recovery standard in n future furnace cycles. full Q is the maximum capacity of the gas holder. holder To predict the gas holder position at a specific time point, For the future n-times of gas delivery to the pressurizer, q i (t) is the characteristic curve of converter gas flow rate versus blowing time in heat i; a fixed value is used in this embodiment; t i1 , t i2 The starting and ending recovery time points of the characteristic curve corresponding to the CO concentration value of the compliant gas are given, where m represents the number of operating compressors. For the compressor flow rate j, t p This refers to the time from the predicted point to the point when gas recovery stops in the nth future furnace.

[0102] In step S3, the gas prediction unit predicts the interval time particle size ≤ 1 blowing cycle and makes a prediction before and after each smelting furnace charging; the return value is the smelting furnace corresponding to the occurrence of a full smelting furnace.

[0103] In step S4, the gas recovery optimization unit specifically includes:

[0104] S41. Received a full gas holder warning;

[0105] S42. Coupled calculation outputs the start and end CO concentration values ​​(> standard concentration) of converter gas recovery for the corresponding furnace batch;

[0106] S43. The calculated value is output to the execution unit, and the execution unit executes the instructions.

[0107] S44. Repeatedly execute S41 to S43 to update the instructions.

[0108] When the gas holder is nearing full capacity and no full gas holder warning is received, execute operation S45:

[0109] S45. Comply with the minimum performance standard for compliant gas.

[0110] In step S4, the output of the calculated value must meet the following target conditions:

[0111]

[0112]

[0113] In step S4, the output of the calculated value must satisfy the following constraints:

[0114]

[0115]

[0116]

[0117] q i (t′ i )≥q LDG

[0118] L i (t′ i )≥L CO

[0119] t′ i1 ≥t i1

[0120] t′ i2 ≤t i2

[0121] t′ i1 ≤t′ i ≤t′ i2

[0122] 0≤t≤t i3

[0123] In the above formula, k represents the number of times the furnace is full, and t′i1 ,t′ i2 Let t′ be the time point of the characteristic curve corresponding to the start and end CO concentrations after optimized control of converter gas recovery in furnace i. i The characteristic curve corresponding to furnace i is between t′ i1 , t′ i2 At any point in time between, L i (t) is the characteristic curve of CO concentration in converter gas of heat i as a function of blowing time, L CO q represents the lower limit of CO concentration for compliant coal gas. LDG t′ represents the lower limit of the gas flow rate required for the gas to meet the standards. p Let k be the time interval between the time point when gas recovery is stopped and the predicted time point. To predict the amount of converter gas that meets the standard at the time when gas recovery stops from point k to k furnace, Let t be the amount of gas delivered by the compressor from the predicted point to the point where gas recovery stops in furnace k, and t be the blowing time variable of the characteristic curve. i3 Let be the time length between the blowing termination time and the time point 0 of the characteristic curve of furnace i.

[0124] The final output in step 4 is the start and end CO time value and concentration value of the recovered converter gas for several future furnace cycles.

[0125] This invention relates to a converter gas recovery method based on gas holder capacity. The gas recovery control system must always meet the O2 concentration constraint value. When the gas holder is full beyond the prediction of the gas recovery control system, it is directly vented. When the gas recovery control system adjustment scheme results in gas holder redundancy, the CO concentration at which converter gas recovery stops is referenced to the lower limit of the CO concentration of the gas at the end of the blowing process.

[0126] Combined Figure 1 As shown, the gas tank level prediction unit first predicts the gas tank level. If the tank is not full in the future, the default program is executed, and gas is recovered according to the predetermined start and end CO concentrations for converter gas recovery. If the tank is full, the gas recovery optimization unit performs coupled calculations and outputs the optimal scheme for converter gas recovery for several future furnace cycles, i.e., the start and end CO concentration values ​​for converter gas recovery for each furnace cycle. The information is then sent to the execution unit for execution. During execution, the cabinet data is continuously monitored. If the cabinet suddenly becomes full, the recovery process stops and the excess gas is released. If the cabinet does not become full after the procedure is completed, the CO concentration in the gas is checked. If yes, continue the recycling operation; otherwise, stop the recycling process.

[0127] It is important to note that Figure 1This is for cases where each smelting furnace cycle does not overlap. When a gas holder corresponds to multiple converters, and the blowing process overlaps, if the gas holder is full (2 or less), first determine if it is the last furnace of the overlapping cycle. If so, then determine... Otherwise, continue executing the original command.

[0128] Combination Figure 4 As shown, this invention also provides a converter gas recovery system based on gas holder capacity to execute the converter gas recovery method based on gas holder capacity of this invention. The system includes a data acquisition system, a gas quantity prediction unit, a gas holder position prediction unit, and a gas recovery optimization unit. The gas quantity prediction unit is constructed based on the data acquisition system. Then, a gas holder position prediction unit is established by combining the data acquisition system and the gas quantity prediction unit. Finally, a gas recovery optimization unit is established based on the coupled calculations of the data acquisition system data, the gas holder position prediction unit, and the gas quantity prediction unit. Details are as follows:

[0129] The data acquisition system is used to collect data on converter gas (converter flue gas), gas holder positions, compressors, and production plans. Gas data includes converter gas flow rate, CO concentration, O2 concentration, and time data; gas holder position data includes gas holder capacity, position, and time data; compressor data includes flow rate and time data for each compressor; and production plan data includes the production plan for the converter corresponding to the gas holder, steel grade data, etc.

[0130] The gas volume prediction unit uses collected converter gas data to establish characteristic curves showing the changes in converter gas flow rate and CO and O2 in the converter gas over blowing time. These characteristic curves are established by averaging data from the most recent 100-200 heats and then fitting the data in segments. Characteristic curves can be established individually for each converter and for each steel grade. The characteristic curves have both self-updating and iterative functions as well as manual correction capabilities.

[0131] The gas holder prediction unit predicts the gas volume over a period of time based on gas holder location data, compressor data, and production plan data, combined with characteristic curves. When the gas volume meets the standard and exceeds the compressor output and the remaining capacity of the gas holder, a full gas holder warning is issued.

[0132] The gas recovery optimization unit performs coupled calculations based on the data acquisition system, gas volume prediction unit, and cabinet position prediction unit to determine the start and end CO concentrations of the converter gas recovered in each batch, so as to achieve the highest grade (calorific value) of recovered gas and the largest amount of gas recovered under the premise that it is necessary to release the gas.

[0133] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A method for recovering converter gas based on the capacity of a gas holder, characterized in that, Includes the following steps: S1. Establish a data acquisition system to collect data. The collected data includes converter flue gas / coal gas data, gas holder location data, compressor data, and production plan data. The converter flue gas / coal gas data includes converter coal gas flow rate data, CO concentration data, O2 concentration data, and time data; The gas holder location data includes gas holder capacity, gas holder location, and time data. The compressor data includes flow rate data and time data for each compressor; The production plan data includes the production plan and steel grade data for the converter corresponding to the converter gas holder. S2. Establish characteristic curves of converter flue gas flow rate and CO and O2 concentrations as a function of blowing time. When establishing the characteristic curve, the start time of blowing is taken as the blowing time 0 point, and the end time of blowing is taken as the end time point; When establishing the characteristic curve, the point at which the CO concentration begins to change drastically after the start of blowing is the zero point, and the point at which the CO concentration approaches zero is the end point. S3. Based on the collected data and characteristic curves, predict whether the gas holder will be full within the next few smelting cycles. The characteristics for determining whether a gas holder is full and the number of furnaces that experience this fullness are as follows: ； In the above formula, n represents the predicted furnace number. This is for the amount of gas that will meet the recovery standard in n future furnace cycles. This is the maximum capacity of the gas holder. To predict the gas holder position at a specific time point, To supply gas volume to the compressor for future n batches, The characteristic curve of converter gas flow rate in heat i as a function of blowing time; , The starting and ending recovery time points of the characteristic curve corresponding to the CO concentration value of the compliant gas are given, where m represents the number of operating compressors. Increase the flow rate of the compressor for j. The time length from the predicted point to the point when the nth furnace recycling cycle will stop; In step S3, when multiple converters are simultaneously blowing gas, the characteristics for determining whether the gas holder is full and the number of times the gas holder is full are as follows: ； In the above formula, The predicted time point is any point in time before the time point when gas recovery is stopped for the nth future furnace. The amount of gas that meets the recovery standards For predicting time points from time point to time point The amount of gas delivered by the compressor For time points The time length at time point 0 of the i-th furnace, For predicting the time point The length of time; S4. If a full alarm is received, perform coupled calculations and output the start and end CO concentrations of the converter gas recovered in each furnace cycle.

2. The converter gas recovery method based on gas holder capacity according to claim 1, characterized in that: In step S3, the next 1 to 5 smelting cycles are predicted. Predicted interval time granularity ≤ 1 blowing cycle; A prediction is made before and after each smelting furnace charge.

3. The converter gas recovery method based on gas holder capacity according to claim 2, characterized in that, Step S4 further includes the following steps: S41. Received a gas holder full warning; S42. Coupled calculation outputs the start and end CO concentration values ​​of the corresponding furnace gas recovery; S43. The calculated value is output to the execution unit, and the execution unit executes the instructions. S44. Repeat steps S41 to S43 to update the instructions; When the gas holder is nearing full and no full gas holder warning is received, proceed with step S45: S45. Comply with the minimum performance standard for compliant gas.

4. The converter gas recovery method based on gas holder capacity according to claim 3, characterized in that, In step S4, the output of the coupling calculation satisfies the following objective condition: ； In step S4, the output of the coupling calculation must satisfy the following constraints: ； In the above formula, k represents the number of times a furnace is full. , The starting and ending points of the characteristic curves for CO concentration after optimized control of converter gas recovery in furnace i are shown. The characteristic curve corresponding to furnace i is between , At any point in time between, The curve showing the characteristic change of CO concentration in converter gas from furnace i as a function of blowing time is shown. This represents the lower limit of CO concentration for compliant coal gas. This refers to the lower limit of the gas flow rate required for the gas to meet the standards. Let k be the time interval between the time point when gas recovery is stopped and the predicted time point. To predict the amount of converter gas that meets the standard at the time when gas recovery stops from point k to k furnace, To predict the amount of gas delivered by the compressor from point k to the point when gas recovery stops, The characteristic curve is the blowing time variable. is the time length between the blowing termination time and the 0 point of the characteristic curve of furnace i. In step S4, when multiple converters are blowing simultaneously, the output of the coupled calculation must meet the following constraints: ； In the above formula, The predicted time point is any point in time before the time when gas recovery stops for the kth future furnace. Standard gas volume For predicting time points from time point to time point The amount of gas delivered by the compressor For time points The time length at time point 0 of the i-th furnace, For predicting the time point The length of time.

5. The converter gas recovery method based on gas holder capacity according to claim 4, characterized in that: The results calculated based on the target conditions and constraints correspond to the time values ​​of the characteristic curves that satisfy the above targets. The corresponding CO concentration values ​​for the start and end of gas recovery need to be calculated based on these characteristic curves. .

6. The converter gas recovery method based on gas holder capacity according to claim 5, characterized in that: In step S3, if the cabinet is full beyond the prediction, it is directly released. When there is redundant cabinet space, the CO concentration at which converter gas recovery stops should be referenced to the lower limit of the standard CO concentration for the gas at the end of converter blowing. .

7. A converter gas recovery system based on gas holder capacity, characterized in that, include: The data acquisition system is used to collect converter gas data, gas holder position data, compressor data, and production plan data. The gas volume prediction unit uses collected converter gas data to establish characteristic curves of converter gas flow rate and CO / O2 in converter gas as a function of blowing time. The gas holder prediction unit predicts the gas volume over a period of time based on gas holder location data, compressor data, and production plan data, combined with characteristic curves. When the gas volume meets the standard and exceeds the compressor output and the remaining capacity of the gas holder, a full gas holder warning is issued. The gas recovery optimization unit, based on the coupled calculations of the data acquisition system, gas volume prediction unit, and cabinet position prediction unit, determines the start and end CO concentrations for each batch of converter gas recovery, achieving the highest recovered gas grade and maximum gas recovery volume under the premise of unavoidable venting. The converter gas recovery system based on gas holder capacity performs the converter gas recovery method based on gas holder capacity as described in any one of claims 1-6.

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