Coke oven gas collection system control and evaluation method

Abstract

The invention relates to a coke oven gas collection system control and evaluation method. The coke oven gas collection system control method comprises the steps of disturbance feedforward control of single gas collection pipe pressure, basic control of single gas collection pipe pressure, pressure head control of a balance gas suction pipe, adjustment of a suction force control range of an air blower and basic control of suction force of the air blower. The coke oven gas collection system evaluation method comprises a coke oven gas collection system evaluation system, wherein the coke oven gas collection system evaluation system comprises an evaluation variable acquisition unit, a data preprocessing unit, a feature extraction unit, a working condition evaluation unit and a feature updating unit; the pressure control device assists operators in fundamentally solving the overall pressure control problem of the gas collection system, ensures that the pressure of the gas collection pipe fluctuates within the range required by the process, ensures the stable work of the coke oven gas collection pipe and the air blower, quickly adjusts the pressure of the gas collection pipe to a stable state, and ensures the safe operation of the whole coke oven gas system.

Description

Technical Field

[0001] The invention relates to the technical field of automatic control of coke oven gas collecting pipe pressure, and in particular to a coke oven gas collecting system control and evaluation method. Background Art

[0002] The coke oven gas collecting pipe pressure is an important parameter in coking production and a reflection of the internal pressure of the coke oven. Its stability directly affects the service life of the coke oven and the production of coke. When negative pressure is formed in the furnace, air will enter the furnace from the furnace door, furnace cover, etc., resulting in coke combustion, increased ash content, and decreased coke quality; when the pressure in the furnace is too high, raw coal gas will come out from the furnace door, furnace cover, etc., causing smoke and fire, and polluting the environment. Therefore, the control of the gas collecting pipe pressure within a moderate range is of great significance to the coke oven production. It can not only save energy, but also reduce environmental pollution. Although there are many methods currently trying to solve the problem of controlling the gas collecting pipe pressure, it is found that the control effect is not good in the research and application of the prior art. The present invention believes that the gas collecting system is seriously affected by the working conditions and it is difficult to solve it with a single control method or control strategy. Therefore, judging the specific problems of the gas collecting system control and adopting targeted solutions will be one of the problems that must be solved to optimize the gas collecting pipe pressure control. Summary of the invention

[0003] The present invention provides a coke oven gas collection system control and evaluation method, which assists operators to fundamentally solve the pressure control problem of the entire gas collection system, ensures that the pressure of the gas collection pipe fluctuates within the range required by the process, ensures the stable operation of the coke oven gas collection pipe and the blower, and quickly adjusts the gas collection pipe pressure to a stable state, thereby ensuring the safe operation of the entire coke oven gas system.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A coke oven gas collection system control method includes the following contents:

[0006] 1) Disturbance feedforward control of single gas collecting pipe pressure: used to solve the impact of coal loading process on gas collecting pipe pressure;

[0007] 2) Basic control of single gas collecting pipe pressure: used to control the gas collecting pipe regulating valve;

[0008] 3) Balanced suction pipe pressure control: used to adjust the hand valve of the gas collecting pipe;

[0009] 4) Adjustment of the blower suction control range: used to give the blower front suction control range, and use the blower stable production collaborative method to fit the blower front suction set value and system parameters;

[0010] 5) Basic control of blower suction: used to control the blower speed;

[0011] The disturbance feedforward control of the single gas collecting pipe pressure adopts a gas collecting pipe pressure disturbance feedforward discrimination system to analyze and predict the trend of the gas collecting pipe pressure change. The gas collecting pipe pressure disturbance feedforward discrimination system includes a feedforward variable acquisition unit, a coal loading disturbance discrimination unit, a feedforward calculation unit, a feedforward monitoring unit, a feedforward evaluation unit and a feedforward parameter updating unit. The specific process includes the following steps:

[0012] S1.1, the feedforward variable acquisition unit collects the real-time pressure value of each gas collecting pipe, the pressure setting value of each gas collecting pipe, the valve position feedback value of each butterfly valve and the coal loading action signal;

[0013] S1.2, the coal loading interference discrimination unit predicts the time point when high pressure appears in the gas collecting pipe, sets the execution identifier of the feedforward calculation unit to 1, the initial value to 0, and provides the parameters required by the feedforward execution unit;

[0014] S1.3, the feedforward calculation unit is triggered by the execution identifier of the feedforward calculation unit. When the execution identifier of the feedforward calculation unit is 1, it calculates the butterfly valve increment according to the pressure average value and pressure setting value of the gas collecting pipe in the most recent 1 / 20 coal loading cycle;

[0015] S1.4, the feedforward monitoring unit inputs the feedforward calculation unit into the control system and monitors the gas collecting pipe pressure;

[0016] S1.5, the feedforward evaluation unit gives the question label of the evaluation result, which is used for the feedforward parameter updating unit;

[0017] S1.6. The feedforward parameter updating unit includes recalculating the standard signal and the feedforward adjustment parameters.

[0018] Furthermore, the coal loading action signal includes a dust removal connecting pipe connection signal, an outer guide sleeve connection signal, a furnace cover opening signal, an inner guide sleeve connection signal, and a coal loading start signal.

[0019] Furthermore, the blower stable production collaborative method adopts a blower stable production collaborative system to determine a calculation model between the blower front suction and the air collecting pipe variable, estimates the blower front suction value according to the calculation model and updates the parameters of the calculation model, and the blower stable production collaborative system includes a blower variable acquisition unit, a blower front suction setting value applicability evaluation unit, a blower front suction setting value calculation unit, a blower front suction setting value control unit, and a blower front suction setting value monitoring unit. The specific process includes the following steps:

[0020] S4.1. The blower variable collection unit collects the average value of the gas collecting pipe pressure during the non-coal loading period, the average value of the gas collecting pipe flap opening during the non-coal loading period, the average value of the gas collecting pipe pressure during the coal loading period, the average value of the gas collecting pipe flap opening during the coal loading period, the upper and lower limits of the ideal value of the gas collecting pipe flap, the set value of the gas collecting pipe pressure, the average value of the gas generation, the upper and lower limits of the gas generation, the current blower front suction setting value, and the current blower front suction upper and lower limits;

[0021] S4.2, the blower front suction force setting value suitability assessment unit is used to determine that when the average opening of the gas collecting pipe flap during the non-coal loading period is between the upper and lower limits of the ideal value of the gas collecting pipe flap, and the full opening time of the gas collecting pipe flap during the coal loading period is less than the maximum full opening time, then the current blower front suction force setting value meets the need of the gas collecting pipe butterfly valve to adjust the gas collecting pipe pressure;

[0022] S4.3, the blower front suction force setting value calculation unit identifies whether the blower front suction force setting value meets the need of the air collecting pipe butterfly valve to adjust the air collecting pipe pressure according to step S4.2, and if not, recalculates the setting value;

[0023] S4.4, the blower front suction force setting value control unit is used to limit the new blower front suction force setting value obtained by the blower front suction force setting value calculation unit, reduce the adjustment range, and avoid the oscillation of the blower front suction force;

[0024] S4.5. The blower front suction setting value monitoring unit monitors the blower speed in real time. When the blower speed is abnormal, it prompts that the blower adjustment system requires manual intervention.

[0025] Furthermore, the manual intervention in step S4.5 includes the following contents:

[0026] 1) If one blower is automatic and the other is manual, when the maximum speed of the automatic blower exceeds 2650r / min, manually increase the blower speed by 50-100r / min, or reduce the opening of the large circulation pipe;

[0027] 2) If one blower is automatic and the other is manual, when the minimum speed of the automatic blower is lower than 2200r / min, manually reduce the blower speed by 50-100r / min, or increase the opening of the large circulation pipe;

[0028] 3) If the maximum speed of the two automatic blowers of the blower exceeds 2600r / min, reduce the opening of the large circulation pipe;

[0029] 4) If the minimum speed of the two automatic blowers of the blower exceeds 2300r / min, increase the opening of the large circulation pipe.

[0030] A coke oven gas collection system evaluation method, comprising a coke oven gas collection system evaluation system, wherein the coke oven gas collection system evaluation system assists a user in supervising the working condition of the gas collection system, judging the working condition of the gas collection system, extracting the characteristics of the historical gas collection system, and then analyzing the characteristics of the current working condition;

[0031] The coke oven gas collection system evaluation system includes an evaluation variable acquisition unit, a data preprocessing unit, a feature extraction unit, a working condition evaluation unit and a feature update unit, and the specific process includes the following steps:

[0032] S1. The evaluation variable acquisition unit collects the real-time pressure value of each gas collecting pipe, the pressure setting value of each gas collecting pipe, the valve position feedback value of each butterfly valve, the coal loading operation signal, the coal loading furnace number information, the real-time value of the suction force before the primary cooler, the real-time value of the suction force before the electric capture, the real-time value of the suction force before the blower, and the real-time value of the gas generation amount;

[0033] S2. The data preprocessing unit calculates the statistics of coal loading operation of each hole in real time according to the operation time of each furnace, and the maintenance period is not taken into account;

[0034] S3, the feature extraction unit uses a data mining method to classify the statistics of the gas collector, obtain the statistical characteristics of each cluster, and evaluate the effect of the gas collector pressure control in each cluster;

[0035] S4. The working condition evaluation unit analyzes the characteristics of each cluster and relates them to the process, and manually gives a description of the working condition characteristics.

[0036] Furthermore, the statistics of step S2 include the mean value of each gas collecting pipe pressure, the mean value of the butterfly valve position, the mean value of the suction force before the primary cooler, the mean value of the suction force before the electric capture, the mean value of the suction force before the blower, and the mean value of the gas generation amount.

[0037] Furthermore, the statistical features in step S3 include the gas collecting pipe pressure, the butterfly valve position, the front suction of the primary cooler, the front suction of the electric collector, the front suction of the blower, and the amount of coal gas generated.

[0038] Furthermore, the step S4 includes evaluating the statistics obtained by the data preprocessing unit in real time, dividing the latest statistics into the cluster closest to it, and then prompting the description of the working condition characteristics represented by the cluster on the screen.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The method of the present invention has a high degree of automation, obvious control effect, stability and reliability, can ensure the stable operation of the coke oven gas collecting pipe and the blower, and provides corresponding solutions to the problems of high pressure of the gas collecting pipe caused by coal loading operation, coupled oscillation of the blower and gas collecting pipe control, and rapid stabilization of the gas collecting pipe itself. The gas collecting pipe pressure can be quickly adjusted to a stable state to ensure the safe operation of the entire coke oven gas system. At the same time, an evaluation plan for the gas collecting system is provided to assist users in identifying problems in the gas collecting pipe control. Through a reasonable gas collecting system control framework, the relationship between the various control methods of the gas collecting system is clarified, and appropriate gas collecting system control evaluation indicators are formulated to assist operators in fundamentally solving the overall pressure control problem of the gas collecting system and ensure that the gas collecting pipe pressure fluctuates within the range required by the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the present invention.

[0042] Figure 2 It is a schematic diagram of the structure of the gas collecting pipe pressure disturbance feedforward discrimination system of the present invention.

[0043] Figure 3 It is a schematic diagram of the structure of the blower stable production collaborative system described in the present invention.

[0044] Figure 4 It is a structural schematic diagram of the coke oven gas collection system evaluation system of the present invention. DETAILED DESCRIPTION

[0045] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0046] See Figure 1, is a schematic diagram of the structure of the present invention. The present invention provides a coke oven gas collection system control and evaluation method, including a coke oven gas collection system control method and a coke oven gas collection system evaluation method. The coke oven gas collection system control method describes the automatic control methods required for various parts of the gas collection system and their relationships. The evaluation part describes a method for judging the working condition of the gas collection system, and the implementation of the auxiliary control method assists the user in supervising the working condition of the gas collection system; the control of the entire gas collection system is divided into disturbance feedforward control of single gas collection pipe pressure, basic control of single gas collection pipe pressure, pressure head control of balanced suction pipe, adjustment of blower suction control range and basic control of blower suction, wherein the disturbance feedforward control of single gas collection pipe pressure is used to solve the impact of coal loading process on gas collection pipe pressure, analyze and predict the trend of gas collection pipe pressure change, and adopt a feedforward strategy for gas collection pipe regulating valve control when gas collection pipe pressure fluctuates greatly; single gas collection pipe pressure The basic control of pipe pressure is used to control the gas collecting pipe regulating valve, and conventional feedback control such as PID control can be used; the pressure head control of the balanced suction pipe is used to adjust the gas collecting pipe hand valve to avoid the problem of poor control effect of the remote gas collecting pipe; the adjustment of the blower suction control range is used to give a reasonable blower front suction control range. For this purpose, the present invention designs a blower stable production collaborative method for adjusting the blower front suction set value, and a suction calculation model is given by statistics of historical data and fitting of suction related data; the basic control of blower suction is used to control the blower speed, and conventional feedback control can be used, and the blower suction set value needs to be given by adjusting the blower suction control range; the data mining means in the coke oven gas collecting system evaluation method are used to classify the working conditions of the gas collecting system, and the current gas collecting system working conditions are evaluated by comparison.

[0047] A coke oven gas collection system control method includes the following contents:

[0048] 1) Disturbance feedforward control of single gas collecting pipe pressure: used to solve the impact of coal loading process on gas collecting pipe pressure. The problem of continuous high pressure of gas collecting pipe is easy to appear during coal loading process. The gas collecting pipe pressure disturbance feedforward discrimination system is used to analyze and predict the trend of gas collecting pipe pressure change, and find reasonable feedforward signal and valve position step value. The gas collecting pipe pressure disturbance feedforward discrimination system includes feedforward variable acquisition unit, coal loading disturbance discrimination unit, feedforward calculation unit, feedforward monitoring unit, feedforward evaluation unit and feedforward parameter update unit. The core units are coal loading disturbance discrimination unit, feedforward calculation unit and feedforward monitoring unit.

[0049] The coal loading interference determination unit is used to determine the occurrence point of the event that the coke oven coal loading operation affects the gas collecting pipe pressure;

[0050] The feedforward calculation unit is used to calculate the butterfly valve position output value of the gas collecting pipe, the pressure setting value, and the execution time of the feedforward control unit;

[0051] The feedforward monitoring unit is used to execute and supervise the results of the feedforward calculation unit, that is, to prevent the abnormal operating conditions of the gas collecting pipe pressure being too high or too low, and to adjust the butterfly valve increment Δu;

[0052] See Figure 2 The control process of the disturbance feedforward control method of the single manifold pressure comprises the following steps:

[0053] S1.1, the feedforward variable acquisition unit collects the real-time pressure value p(t) of each gas collecting pipe, the pressure setting value ps(t) of each gas collecting pipe, the valve position feedback value u(t) of each butterfly valve, and the coal loading action signals include dust removal connecting pipe connection, external guide sleeve connection, furnace cover opening, internal guide sleeve connection, and coal loading start, a total of five signals;

[0054] S1.2, the coal loading interference discrimination unit adopts the coal loading signal delay method to predict the time point when the high pressure appears in the gas collecting pipe, sets the execution identifier flag of the feedforward calculation unit to 1, the initial value flag = 0, and provides the parameters required by the feedforward execution unit. The specific process of the coal loading signal delay method is as follows:

[0055] a) In N historical data, check the time point t1(k) when the dust removal connection pipe connection signal changes from false to true point by point, and find the time point t1(k) when the gas collecting pipe high pressure is the largest within 1 / 3 of the coal loading cycle after this time point. s (k) If no high-pressure condition of the gas collecting pipe is found, the statistical quantity is ignored. It is particularly required that the historical data of this step contains at least five large-cycle coke pushing plans with normal production in the most recent month;

[0056] b) At time points t1(k) and t s (k), find the time points t2(k)…t5(t) when the outer guide sleeve is connected, the furnace cover is opened, the inner guide sleeve is connected, and the coal loading start signal changes from false to true, and calculate the time difference Δt i (k) = t s (k)-t i (k), i = 1…5, if a certain signal is found at the time point t i (k), i=2…5 is missing, then set t i (k) = t i-1 (k)i=2..5, while reducing the confidence μ of the signal itself i =μ i +1, initial value μ i =0;

[0057] c) Perform data statistics on Δt1(k)…Δt8(k) to obtain the mean of Δt1…Δt8 and variance By variance and confidence μ i size, determine the reliability of each signal, The smallest point is used as the standard signal point Right now

[0058] d) During the coke oven production process, when the standard signal point is detected When the step changes from false to true, the execution identifier flag of the output feedforward calculation unit is 1, and the standard signal point The corresponding time difference mean and variance

[0059] S1.3, the feedforward calculation unit is triggered by the flag. When flag = 1, it calculates the average pressure of the gas collector in the last 1 / 20 coal loading cycle. Set value p s , calculate the reasonable butterfly valve increment Δu, the specific formula for coal loading step valve position is as follows:

[0060]

[0061] Among them, a∈R(0,0.6) is an adjustable parameter, and the initial value is a=0.5;

[0062] S1.4, the feedforward monitoring unit inputs the feedforward calculation unit into the control system and monitors the gas collecting pipe pressure. It consists of two parts: output valve position calculation and output valve position fine-tuning. The specific execution process is as follows:

[0063] a) Add the butterfly valve increment Δu obtained by the feedforward calculation unit to the average valve position u of the butterfly valve in the most recent 1 / 20 coal loading cycle of the gas collector to obtain the output valve position u(t) = u + Δu;

[0064] b) According to the manually given high and low limit of the butterfly valve u high and u low , adjust u(t) so that the butterfly valve is always at u high ≥u(t)≥u low Within the effective opening, the adjusted output valve position u(t) is input into the control system and maintained. The holding time is the mean time difference corresponding to the standard signal i.

[0065] c) During the period of maintaining the output valve position u+Δu, refer to the manually given manifold low pressure limit p low , adjust the output valve position u(t), if p(t)≤p low ,but c∈R(0,1); if p(t)≥ps ,but c∈R(0.1,1) is the adjustment parameter, with the initial value c=0.5; parameter n is the number of fine-tuning times, with the initial value n=0;

[0066] d) If one of the following two conditions is met, the feedforward adjustment is terminated and flag is set to 0. The two conditions are: 1) The hold time is reached 2) The pressure of the gas collecting pipe increases rapidly for m consecutive times, that is, p(t+1)-p(t)>ε; here, m and ε need to be given manually, m=3 and ε=20;

[0067] S1.5. The feedforward evaluation unit only evaluates the effect of parameter a and gives the problem label flag of the evaluation result. a , used for the feedforward parameter update unit, the specific process is as follows:

[0068] a) Count the average number of butterfly valve fine-tuning times within a coal loading cycle The average of the maximum pressure between the standard signal and the manifold pressure peak and minimum mean

[0069] b) According to the manually given high and low pressure limits p of the gas collecting pipe high and p low , evaluate the control effect of parameter a and modify the problem label flag a ;

[0070] Case 1: If Then the value of parameter a is considered ideal, and the problem label flag is set a =0;

[0071] Case 2: If and Then we think that the value of parameter a is too large, and set the problem flag a =1, where f is the execution frequency of the feedforward unit;

[0072] Case 3: If and Then we think that the value of parameter c is too small, and set the problem flag a =-2;

[0073] Case 4: If Then we think that the value of parameter a is too small, and set the problem flag a = -1;

[0074] Case 5: If Then we think that the values ​​of parameters a and c are too large, and set the problem flag a =2;

[0075] S1.6, the feedforward parameter updating unit includes recalculating the standard signal and adjusting the parameters a and c; the standard signal can be recalculated by the method described in step S1.2, and the recalculation provides two methods: manual forcing and updating according to multiple large cycles; adjusting the parameters a and c, according to the problem label flag a Make adjustments, the specific formula is as follows:

[0076]

[0077] 2) Basic control of single manifold pressure: used to control the manifold regulating valve, conventional feedback control such as PID control can be used.

[0078] 3) Balanced suction pipe pressure head control: used to adjust the gas collecting pipe manual valve to avoid the problem of poor control effect of the remote gas collecting pipe.

[0079] 4) Adjustment of the blower suction control range: The blower stable production coordination method adopts the blower stable production coordination system to determine the calculation model between the blower front suction and the gas collector variable, estimates the blower front suction value according to the calculation model and updates the parameters of the calculation model, so as to solve the problem that the blower suction setting value cannot be automatically adjusted when the coke oven gas generation amount changes. Figure 3 The blower stable production collaborative system includes a blower variable acquisition unit, a blower front suction setting value applicability evaluation unit, a blower front suction setting value calculation unit, a blower front suction setting value control unit, and a blower front suction setting value monitoring unit. The blower stable production collaborative method is used to fit the blower front suction setting value calculation model, and the core unit is the blower front suction setting value calculation unit. The specific process includes the following steps:

[0080] S4.1, the blower variable acquisition unit is used to collect the following variables:

[0081] (1) Average gas collector pressure during non-coal loading period Obtained from the statistics of non-coal loading data in the first 10 minutes;

[0082] (2) Average opening of the gas collector flap during non-coal loading period Obtained from the statistics of non-coal loading data in the first 10 minutes;

[0083] (3) Average gas collector pressure during coal loading Obtained from the coal loading data statistics in the first 10 minutes;

[0084] (4) Average opening of gas collector flap during coal loading Obtained from the coal loading data statistics in the first 10 minutes;

[0085] (5) The upper and lower limits of the ideal value of the gas collector flap u max and u min , given manually;

[0086] (6) Gas collector pressure setting value p CGas.sp , given manually;

[0087] (7) Average value of gas generation F COG , obtained from the data statistics within 10 minutes, the upper and lower limits F COG.max and F COG.min , given after statistical operation rules, but will be constantly adjusted during algorithm execution;

[0088] (8) Current blower front suction setting value p fan.sp , real-time acquisition, upper and lower limits p fan.ma and p fan.min , given manually;

[0089] (9) Full opening time of gas collecting pipe flap during coal loading Obtained from the coal loading data statistics in the first 10 minutes;

[0090] (10) Maximum full opening time of the gas collecting pipe flap during coal loading t Max , given manually;

[0091] S4.2. The blower front suction setting value suitability assessment unit is used to determine whether the current blower front suction setting value can meet the needs of the gas collecting pipe butterfly valve to adjust the gas collecting pipe pressure, avoid excessively high or low gas collecting pipe pressure, and calculate the average of 10-minute data, record once per second, and distinguish the quality of each record by the following evaluation indicators. The evaluation indicators are as follows:

[0092] Average opening of the gas collecting pipe flap during non-coal loading period,

[0093] The time when the gas collecting pipe flap is fully opened during coal loading,

[0094] in, is the time when the gas collecting pipe flap is fully opened during coal loading, t Max is the maximum full-open time;

[0095] S4.3. The blower front suction setting value calculation unit determines whether to recalculate the setting value based on whether the evaluation index is met. The recalculation process is as follows:

[0096] a) Based on the gas collecting pipe pressure, regulating valve opening, and gas generation, the change in the suction setting value before the blower is calculated. The variable parameters are a and b. The updated value is obtained by performing data statistics once every period of time. The regular time is set to 15 days.

[0097]

[0098]

[0099] Among them, Δp unload is the average deviation of the gas collecting pipe pressure during the non-coal loading period, Δp load is the average deviation of the gas collecting pipe pressure during coal loading, Δu unload is the average deviation of the valve position of the gas collector during the non-coal loading period, Δu unload is the average deviation of the gas collector valve position during coal loading, Δu is the incremental valve position statistic, is the average valve position statistic, γ is the gas flow compensation coefficient, p Fan.sp.new1 is the blower front suction force setting value corrected by the gas collecting pipe valve position and gas volume, μ load and μ unload is the balance coefficient between coal-loaded and non-coal-loaded, b, c, d are empirical parameters;

[0100] b) Based on the amount of gas generated, calculate the range of the blower front suction setting value;

[0101]

[0102] Among them, p Fan.sp.new2 It is the blower front suction force setting value corrected by the blower front suction force limit value and the gas volume;

[0103] c) Select p Fan.sp.new1 and p Fan.sp.new2 Which one is the new setting value? Try to change the setting value as small as possible, so finally select which setting value to press p Fan.sp.new1 and p Fan.sp.new2 With p fan.sp Determine the degree of proximity;

[0104]

[0105] S4.4, the blower front suction setting value control unit is used to limit the new blower front suction setting value obtained by the blower front suction setting value calculation unit, and try to reduce the adjustment range to avoid the oscillation of the blower front suction. The specific process is as follows:

[0106] a) The highest frequency of adjusting the blower front suction force setting value is recommended to be two adjacent coal loading operations, i.e. two coal loading cycles. At the same time, the time point for modifying the setting value should avoid the coal loading process;

[0107] b) Before modifying the set value, make sure that the new set value and the process value are on the same side of the original set value, that is, (p fan.sp -p fan )(p fan.sp -pfan.sp.new )≥0, so as not to cause shock, where p fan is the real-time value of the suction force before the blower, p fan.sp.new is the corrected blower front suction setting value; if |p Fan.sp.new -p fan.sp | If the value exceeds 0.1 kPa, the value should be changed within 0.03 kPa at intervals of 1 minute multiple times;

[0108] C) Do not modify the set value during the suction oscillation of the blower. fan -p fan.sp ) has a mean <ε, variance >σ 2 , to judge the oscillation, the reference pressure range is 1%, take ε = 0.01, σ 2 =0.0225, the oscillation detection period should not intersect with the coal loading process, and its period is selected as 10% of the non-coal loading time;

[0109] S4.5 Blower front suction set value monitoring unit monitors the blower speed in real time. When the blower speed is abnormal, it prompts that the blower adjustment system needs manual intervention. The abnormal situation and treatment methods are as follows:

[0110] a) If one blower is automatic and the other is manual, when the maximum speed of the automatic blower exceeds 2650r / min, increase the blower speed manually by 50-100r / min, or reduce the opening of the large circulation pipe;

[0111] b) If one blower is automatic and the other is manual, when the minimum speed of the automatic blower is lower than 2200r / min, manually reduce the blower speed by 50-100r / min, or increase the opening of the large circulation pipe;

[0112] c) If the maximum speed of the two automatic blowers of the blower exceeds 2600r / min, reduce the opening of the large circulation pipe;

[0113] If the minimum speed of the two automatic blowers of the blower exceeds 2300r / min, increase the opening of the large circulation pipe.

[0114] 5) Basic control of blower suction: used to control the blower speed, using conventional feedback control, the blower suction set value is given by adjusting the blower suction control range.

[0115] A coke oven gas collection system evaluation method, comprising a coke oven gas collection system evaluation system, wherein the coke oven gas collection system evaluation system assists a user in supervising the working condition of the gas collection system, judging the working condition of the gas collection system, extracting the characteristics of the historical gas collection system, and then analyzing the characteristics of the current working condition;

[0116] See Figure 4The coke oven gas collection system evaluation system includes an evaluation variable acquisition unit, a data preprocessing unit, a feature extraction unit, a working condition evaluation unit and a feature update unit. The system solves the problem of evaluating the current working condition of the gas collection system. The core is the analysis and statistics of historical data. The feature extraction unit uses a data mining method to extract the characteristics of the historical gas collection system, and compares them with the current working condition in the working condition evaluation unit, thereby analyzing the characteristics of the current working condition. The specific process includes the following steps:

[0117] S1, evaluation variable collection unit, collects the real-time value of the pressure of each gas collecting pipe, the pressure setting value of each gas collecting pipe, the feedback value of the valve position of each butterfly valve, the coal loading operation signal, the coal loading furnace number information, the real-time value of the suction force before the primary cooler, the real-time value of the suction force before the electric capture, the real-time value of the suction force before the blower, and the real-time value of the gas generation amount;

[0118] S2, data preprocessing unit, calculates the statistics of coal loading operation of each hole in real time according to the operation time of each furnace, and does not take the maintenance period into consideration. The statistics include: the average pressure of each gas collecting pipe, the average position of butterfly valve, the average suction force before primary cooler, the average suction force before electric capture, the average suction force before blower, and the average gas generation amount. The specific process is as follows:

[0119] a) When the earliest step signal of coal loading operation from false to true is detected, the data preprocessing unit starts to record the real-time value of the statistical data to be counted;

[0120] b) When the running time tag of the data preprocessing unit reaches the operation time of each furnace, or the coal loading operation changes from false to true again, the data preprocessing unit ends the recording of pending statistical data;

[0121] c) Calculate each statistic, organize it into a record, and store it in the database;

[0122] S3, feature extraction unit, is used to classify the statistics of the gas collector by using data mining method, obtain the statistical characteristics of each cluster, and evaluate the effect of the gas collector pressure control in each cluster. The specific process is as follows:

[0123] a) For the database X = [x1…x n ] T ∈R n×m Record x i =[x i1 …x im ]∈R m The property x ij ∈R, perform principal component analysis to reduce the redundancy between attributes, that is, there is a matrix G∈R with orthogonal columns m×k ,m>k, so that Y=XG∈R n×kThe information of each column is independent. Among them, X is a matrix composed of the statistics described in S2, Y is a sample feature matrix after dimensionality reduction to k dimensions, G is a projection matrix composed of eigenvectors according to eigenvalues, and x i is a vector composed of each statistic described in S2;

[0124] b) Normalize each column of the matrix Y to obtain where to ensure that the dimensions are consistent when calculating the correlation between two records, where is the normalized sample eigenvalue, and y ij is the original sample eigenvalue, is the normalized sample feature matrix;

[0125] c) Perform clustering on the rows of the matrix Divide the rows of the matrix into h clusters, and the cluster center is defined as The clustering method is tentatively set as the simplest K-means, that is The distance between rows is calculated according to the Euclidean distance, that is The distance between and is

[0126] The number of clusters obtained by clustering, according to the level of the gas collecting pipe pressure, h = 7; d) Divide the matrix Y according to the clustering situation of the matrix i to obtain the cluster centers c of each cluster of the matrix Y

[0127] S4. The working condition evaluation unit. The analysis of the characteristics of each cluster and the combination with the process are described by the operator to give the description of the working condition characteristics. In addition, evaluate the statistics obtained by the data preprocessing unit in real time, and divide the latest statistic y into the cluster closest to it, that is Then prompt the description of the working condition characteristics represented by this cluster on the screen;

[0128] S5. The feature update unit is used to perform incremental adjustment on the cluster center. For a new statistic, before the new statistic y is assigned to cluster j, check the size relationship between the number of statistics g in cluster j and the number of statistics n in the database. If g < n, directly update the cluster center c j =(g×c j +y) / g + 1; if g ≥ n, first剔除 the earliest g - n - 1 statistics Z ∈ R (g-n-1)×m in the cluster, and then update the cluster center In addition, the execution of the feature update unit can be calculated at a specific time interval, except for manual forced requirements, and take 30 large cycle periods.

[0129] The above embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. A coke oven gas collection system control method, characterized in that: It includes the following: 1) Disturbance feedforward control of single gas collecting pipe pressure: used to solve the impact of coal loading process on gas collecting pipe pressure; 2) Basic control of single gas collecting pipe pressure: used to control the gas collecting pipe regulating valve; 3) Balanced suction pipe pressure head control: used to adjust the gas collecting pipe manual valve; 4) Adjustment of the blower suction control range: used to give the blower front suction control range, and use the blower stable production collaborative method to fit the blower front suction setting value and system parameters; 5) Basic control of blower suction: used to control the blower speed; The disturbance feedforward control of the single gas collecting pipe pressure adopts a gas collecting pipe pressure disturbance feedforward discrimination system to analyze and predict the trend of the gas collecting pipe pressure change. The gas collecting pipe pressure disturbance feedforward discrimination system includes a feedforward variable acquisition unit, a coal loading disturbance discrimination unit, a feedforward calculation unit, a feedforward monitoring unit, a feedforward evaluation unit and a feedforward parameter updating unit. The specific process includes the following steps: S1.1, the feedforward variable acquisition unit collects the real-time pressure value of each gas collecting pipe, the pressure setting value of each gas collecting pipe, the valve position feedback value of each butterfly valve and the coal loading action signal; S1.2, the coal loading interference discrimination unit predicts the time point when high pressure appears in the gas collecting pipe, sets the execution identifier of the feedforward calculation unit to 1, the initial value to 0, and provides the parameters required by the feedforward execution unit; S1.3, the feedforward calculation unit is triggered by the execution identifier of the feedforward calculation unit. When the execution identifier of the feedforward calculation unit is 1, it calculates the butterfly valve increment according to the pressure average value and pressure setting value of the gas collecting pipe in the most recent 1 / 20 coal loading cycle; S1.4, the feedforward monitoring unit inputs the feedforward calculation unit into the control system and monitors the gas collecting pipe pressure; S1.5, the feedforward evaluation unit gives the question label of the evaluation result, which is used for the feedforward parameter updating unit; S1.

6. The feedforward parameter updating unit includes recalculating the standard signal and the feedforward adjustment parameters.

2. A coke oven gas collection system control method according to claim 1, characterized in that: The coal loading action signal includes a dust removal connecting pipe connection signal, an outer guide sleeve connection signal, a furnace cover opening signal, an inner guide sleeve connection signal, and a coal loading start signal.

3. A coke oven gas collection system control method according to claim 1, characterized in that: The blower stable production collaborative method adopts a blower stable production collaborative system to determine a calculation model between the blower front suction and the air collecting pipe variable, estimates the blower front suction value according to the calculation model and updates the parameters of the calculation model. The blower stable production collaborative system includes a blower variable acquisition unit, a blower front suction setting value applicability evaluation unit, a blower front suction setting value calculation unit, a blower front suction setting value control unit, and a blower front suction setting value monitoring unit. The specific process includes the following steps: S4.

1. The blower variable collection unit collects the average value of the gas collecting pipe pressure during the non-coal loading period, the average value of the gas collecting pipe flap opening during the non-coal loading period, the average value of the gas collecting pipe pressure during the coal loading period, the average value of the gas collecting pipe flap opening during the coal loading period, the upper and lower limits of the ideal value of the gas collecting pipe flap, the set value of the gas collecting pipe pressure, the average value of the gas generation, the upper and lower limits of the gas generation, the current blower front suction setting value, and the current blower front suction upper and lower limits; S4.2, the blower front suction force setting value suitability assessment unit is used to determine that when the average opening of the gas collecting pipe flap during the non-coal loading period is between the upper and lower limits of the ideal value of the gas collecting pipe flap, and the full opening time of the gas collecting pipe flap during the coal loading period is less than the maximum full opening time, then the current blower front suction force setting value meets the need of the gas collecting pipe butterfly valve to adjust the gas collecting pipe pressure; S4.3, the blower front suction force setting value calculation unit identifies whether the blower front suction force setting value meets the need of the air collecting pipe butterfly valve to adjust the air collecting pipe pressure according to step S4.2, and if not, recalculates the setting value; S4.4, the blower front suction force setting value control unit is used to limit the new blower front suction force setting value obtained by the blower front suction force setting value calculation unit, reduce the adjustment range, and avoid the oscillation of the blower front suction force; S4.

5. The blower front suction setting value monitoring unit monitors the blower speed in real time. When the blower speed is abnormal, it prompts that the blower adjustment system requires manual intervention.

4. A coke oven gas collection system control method according to claim 1, characterized in that: The manual intervention in step S4.5 includes the following contents: 1) If one blower is automatic and the other is manual, when the maximum speed of the automatic blower exceeds 2650r / min, manually increase the blower speed by 50-100r / min, or reduce the opening of the large circulation pipe; 2) If one blower is automatic and the other is manual, when the minimum speed of the automatic blower is lower than 2200r / min, manually reduce the blower speed by 50-100r / min, or increase the opening of the large circulation pipe; 3) If the maximum speed of the two automatic blowers of the blower exceeds 2600r / min, reduce the opening of the large circulation pipe; 4) If the minimum speed of the two automatic blowers of the blower exceeds 2300r / min, increase the opening of the large circulation pipe.

5. A coke oven gas collection system evaluation method, characterized in that: It includes a coke oven gas collection system evaluation system, which assists the user to monitor the working condition of the gas collection system, judge the working condition of the gas collection system, extract the characteristics of the historical gas collection system, and then analyze the characteristics of the current working condition; The coke oven gas collection system evaluation system includes an evaluation variable acquisition unit, a data preprocessing unit, a feature extraction unit, a working condition evaluation unit and a feature update unit, and the specific process includes the following steps: S1. The evaluation variable acquisition unit collects the real-time pressure value of each gas collecting pipe, the pressure setting value of each gas collecting pipe, the valve position feedback value of each butterfly valve, the coal loading operation signal, the coal loading furnace number information, the real-time value of the suction force before the primary cooler, the real-time value of the suction force before the electric capture, the real-time value of the suction force before the blower, and the real-time value of the gas generation amount; S2. The data preprocessing unit calculates the statistics of coal loading operation of each hole in real time according to the operation time of each furnace, and the maintenance period is not taken into account; S3, the feature extraction unit uses a data mining method to classify the statistics of the gas collector, obtain the statistical characteristics of each cluster, and evaluate the effect of the gas collector pressure control in each cluster; S4. The working condition evaluation unit analyzes the characteristics of each cluster and relates them to the process, and manually gives a description of the working condition characteristics.

6. A coke oven gas collection system control method according to claim 5, characterized in that: The statistics in step S2 include the mean pressure of each gas collecting pipe, the mean position of the butterfly valve, the mean suction force before the primary cooler, the mean suction force before the electric collector, the mean suction force before the blower, and the mean gas generation amount.

7. A coke oven gas collection system control method according to claim 5, characterized in that: The statistical features in step S3 include the gas collecting pipe pressure, the butterfly valve position, the front suction of the primary cooler, the front suction of the electric precipitator, the front suction of the blower, and the amount of gas generated.

8. A coke oven gas collection system control method according to claim 5, characterized in that: The step S4 includes evaluating the statistics obtained by the data preprocessing unit in real time, dividing the latest statistics into the cluster closest to it, and then prompting the description of the working condition characteristics represented by the cluster on the screen.

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