Gas recovery control method and system based on automatic control and data processing

Abstract

The present invention discloses a gas recovery and control method and system based on automatic control and data processing, which relates to the technical field of industrial gas recovery and control. By collecting historical detection data of the flow of characteristic gas characteristic points from a basic detection system to a proofreading system and then from the proofreading system to a front-end detection system of a switching valve during N historical operations, during actual operation, actual control detection data of the flow of characteristic gas characteristic points from the basic detection system to the proofreading system are collected. Based on the comparison of the actual detected time from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system during historical operations, a set of similar historical operation processes is screened out, and based on the historical detection data of the set of similar historical operation processes, the action time is calculated, thereby achieving the purpose of increasing the industrial gas recovery volume and preventing extreme safety accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial gas recovery and control, and in particular to a gas recovery and control method and system based on automatic control and data processing. Background Art

[0002] Many industrial processes generate industrial gases containing usable components. Under certain conditions, these gases can be collected and processed through recovery systems for energy utilization or resource recycling, thereby reducing costs and increasing efficiency. However, ensuring safe and efficient recovery of industrial gases remains a key technical challenge in the field of industrial gas processing and automated control.

[0003] Currently, the recovery process of industrial gases typically relies on real-time monitoring of changes in gas composition. When the gas composition is detected to meet recovery standards, the control system switches the gas from the discharge path to the recovery path through a switching valve, where it enters a storage or subsequent processing system. When the gas composition does not meet the recovery conditions, the switching valve is used to switch it back to the discharge path. However, in actual industrial operations, due to the dynamic changes in gas composition, the flow characteristics of the pipeline system, and the response delay of the valve switching action, the existing recovery system has the following technical problems in terms of efficiency and safety:

[0004] It usually takes a certain amount of time for the switching valve to complete the switching from receiving the instruction (which may vary from several seconds to more than ten seconds in different systems), and the time required for the industrial gas to flow from the production equipment to the switching valve may also be longer. This time delay, combined with the dynamic changes in the gas composition, may cause some gases that do not meet the recycling standards (such as gases containing flammable and explosive components) to enter the recycling path, posing serious safety hazards to storage equipment, pipeline systems, and even the entire recycling process. For example, in some cases, the gas composition may experience a rapid increase in oxygen concentration and a rapid decrease in the concentration of combustible components due to sudden changes in process conditions, thereby forming potentially hazardous gases and increasing the safety risks of equipment operation.

[0005] Chinese patent application CN101713010B discloses a method for recovering converter gas using a mathematical model. The method establishes a mathematical model for determining the CO content at the start and end of converter gas recovery, the calorific value of the converter gas, and the recovery volume. The model also provides formulas for calculating the calorific value and recovery volume of the converter gas. However, this method fails to address the issue of calculating the switching valve delay time, and thus fails to achieve the desired effect of increasing gas recovery.

[0006] To this end, the present invention proposes a gas recovery control method and system based on automatic control and data processing. Summary of the Invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a gas recovery control method and system based on automatic control and data processing to achieve the goals of increasing gas recovery and preventing extreme safety accidents.

[0008] To achieve the above objectives, a gas recovery control method based on automatic control and data processing is proposed, comprising the following steps:

[0009] Step 1: Install the basic detection system and calibration system in sequence at the front end of the detection system at the front end of the switching valve;

[0010] Step 2: Collect historical detection data of characteristic gas characteristic points during the flow from the basic detection system to the calibration system and then from the calibration system to the switching valve front-end detection system during N historical operations; N is the preset number of historical operations;

[0011] Step 3: During the actual operation, collect the actual control test data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system;

[0012] Step 4: Compare the actual time from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system during historical operation, select a set of similar historical operation processes, and calculate the action time based on the historical detection data of the similar historical operation process set;

[0013] Step 5: Set the moment when the calibration system detects the characteristic gas characteristic point as the basic moment, and calculate the timing moment according to the basic moment, action time and valve action time. When the timing moment is reached, the automatic control system triggers the valve switching to switch the gas from the recovery section to the discharge section.

[0014] The basic detection system and calibration system are both composed of gas concentration detection instruments and physical sensors;

[0015] The calibration system is located between the basic detection system and the switching valve front-end detection system. The calibration system must be installed before the electrostatic precipitator at the front end of the switching valve. If the electrostatic precipitator is not configured in the smelting system, the physical distance between the installation position of the calibration system and the switching valve is set to the time required for the switching valve to complete the valve action multiplied by the flue gas velocity, and then plus a preset safety reserve distance.

[0016] The valve action time refers to the time from the start of valve switching to the completion of valve switching.

[0017] The historical detection data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system and then from the calibration system to the switching valve front-end detection system are collected in the following manner:

[0018] Collect the gas concentration detected by the basic detection system and the calibration system, the physical parameters collected by various physical sensors, and the flow time from the basic detection system to the calibration system to form historical comparison detection data;

[0019] The gas concentration of characteristic gases detected at the basic detection system, the physical parameters collected by various physical sensors, and the flow time from the calibration system to the switching valve front-end detection system are collected to form historical reference detection data.

[0020] In the actual operation process, the method of collecting the actual control test data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system is:

[0021] During actual operation, the actual control detection data is formed by collecting the gas concentration of characteristic gases detected in the basic detection system and the calibration system, the physical parameters collected by various physical sensors, and the circulation time from the basic detection system to the calibration system.

[0022] The method of screening out similar historical operation processes based on the comparison of the time actually detected from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system in the historical operation process is as follows:

[0023] Mark the number of each historical running process as n;

[0024] The duration from the basic detection system to the proofreading system during the nth historical operation is marked as THn;

[0025] The time from the basic detection system to the proofreading system in the actual operation process is marked as TR;

[0026] Calculate the time difference value TDn between TR and THn of any n-th historical running process; wherein the calculation formula of the time difference value TDn is: TDn = |TR-THn|;

[0027] A time approximation threshold is set in advance, and from all historical running processes, the historical running processes whose time difference value TDn is less than the time approximation threshold are screened out to form a screening process set;

[0028] The physical parameters collected by each physical sensor are numbered as f;

[0029] The value of the f-th physical parameter collected by the basic detection system during the n-th historical operation is marked as ZHSnf;

[0030] The value of the fth physical parameter collected by the calibration system during the nth historical operation is marked as ZHCnf;

[0031] The value of the fth physical parameter collected by the basic detection system during the actual operation is marked as ZRSf;

[0032] The value of the fth physical parameter collected by the calibration system during the actual operation is marked as ZRCf;

[0033] Calculate the parameter differences in the basic detection system and the calibration system during each historical operation process and the actual operation process respectively;

[0034] At the basic detection system, the parameter difference of the fth physical parameter is marked as ZDSnf;

[0035] At the calibration system, the parameter difference of the fth physical parameter is marked as ZDCnf;

[0036] According to the parameter difference and time difference of each physical parameter, the matching degree Pn of the nth historical operation process in a screening process set is calculated;

[0037] From the set of screening processes, Q historical running processes with the smallest matching degree Pn are screened out as the set of similar historical running processes; Q is the preset number of similar historical running processes.

[0038] The method of calculating the action time based on the historical detection data of the set of similar historical operation processes is:

[0039] Mark the number of each historical running process in the set of similar historical running processes as q;

[0040] The time it takes for the characteristic gas to travel from the calibration system to the front-end detection system of the switching valve during the qth historical operation is expressed as the reference time and marked as Xq;

[0041] The matching degree between the qth historical running process and the actual running process is expressed as the reference matching degree and marked as Pq;

[0042] Calculate the action time based on the reference duration Xq and the reference matching degree Pq;

[0043] The timing moment is the base moment plus the warning time; the warning time is: the minimum action time minus the valve action time, minus the preset safety time greater than 0.

[0044] A gas recovery control system based on automatic control and data processing is proposed, which includes a historical data collection module, an actual data collection module, a data comparison module and a valve switching module; wherein each module is electrically connected;

[0045] The historical data collection module is installed at the front end of the detection system at the front end of the switching valve. The basic detection system and the calibration system are installed in sequence. The module collects historical detection data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system and then from the calibration system to the detection system at the front end of the switching valve during N historical operations, and sends the historical detection data to the data comparison module.

[0046] The actual data collection module collects the actual control test data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system during the actual operation, and sends the actual control test data to the data control module;

[0047] The data comparison module compares the actual detected time from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system during the historical operation process, selects a set of similar historical operation processes, calculates the action time based on the historical detection data of the similar historical operation process set, and sends the action time to the valve switching module;

[0048] The valve switching module sets the moment when the calibration system detects the characteristic gas characteristic point as the basic moment, calculates the timing moment based on the basic moment, the action time and the valve action time. When the timing moment is reached, the automatic control system triggers the valve switching to switch the gas from the recovery section to the discharge section.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The present invention collects sufficient operation process data, including the time value of the characteristic point of the characteristic gas from the basic detection system to the proofreading system, and the time value from the proofreading system to the front-end detection system of the switching valve, by installing a basic detection system and a proofreading system in front of the detection system in front of the switching valve, and forms a historical operation process with a retrieval function. In the actual operation process, as long as the time of the characteristic gas characteristic point from the basic detection system to the proofreading system is detected, it is compared with the time value of the same characteristic gas characteristic point from the basic detection system to the proofreading system in n operation processes collected in the historical operation process, and then the time value from the proofreading system to the front-end detection system of the switching valve corresponding to the same time value from the basic detection system to the proofreading system is obtained, and then the moment when the characteristic gas characteristic point is detected by the proofreading system is obtained as the reference moment and the timing moment. On this basis, the action moment of the switching valve is determined, and then the qualified industrial gas should be collected as much as possible in the later stage of smelting, before and after the gun is lifted, so as to achieve the purpose of increasing the recovery of industrial gas and preventing extreme safety accidents. For a 120-ton converter, generally no less than 10 million Nm can be recovered each year. 3 of gas volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1Flowchart of the gas recovery control method based on automatic control and data processing in Example 1 of the present invention;

[0052] Figure 2 This is a module connection diagram of the gas recovery and control system based on automatic control and data processing in Example 2 of the present invention. DETAILED DESCRIPTION

[0053] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0054] Example 1

[0055] like Figure 1 As shown, the gas recovery control method based on automatic control and data processing includes the following steps:

[0056] Step 1: Install the basic detection system and calibration system in sequence at the front end of the detection system at the front end of the switching valve;

[0057] Step 2: Collect historical detection data of characteristic gas characteristic points during the flow from the basic detection system to the calibration system and then from the calibration system to the switching valve front-end detection system during N historical operations; N is the preset number of historical operations;

[0058] Step 3: During the actual operation, collect the actual control test data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system;

[0059] Step 4: Compare the actual time from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system during historical operation, select a set of similar historical operation processes, and calculate the action time based on the historical detection data of the similar historical operation process set;

[0060] Step 5: Set the moment when the calibration system detects the characteristic gas characteristic point as the basic moment, and calculate the timing moment according to the basic moment, action time and valve action time. When the timing moment is reached, the automatic control system triggers the valve switching to switch the gas from the recovery section to the discharge section.

[0061] In some real-time scenarios, it should be noted that, for example, the converter primary dust removal system is divided into a wet dust removal system and a dry dust removal system.

[0062] The characteristic of the wet dust removal system is that it uses water washing to wash the dust in the flue gas to achieve the purpose of dust removal. The characteristic equipment in the wet dust removal system is cooling equipment + annular gap equipment + cyclone dehydrator. The wet dust removal system is formed with annular gap equipment as the core equipment and combined with other dust removal equipment. For example, ultrasonic dust removal equipment is added to the rear end of the characteristic equipment of the wet dust removal system.

[0063] The wet dust removal systems mainly include annular gap combination system (such as the new OG system, semi-dry system), annular gap combination composite acoustic dust removal system and wet wet electric composite dust removal system.

[0064] The new OG system is: spray tower + annular seam + cyclone dehydrator;

[0065] The semi-dry system is: evaporative cooling tower + spray tower + annular seam + cyclone dehydrator;

[0066] The annular seam combined composite acoustic dust removal system is: new OG / semi-dry method + acoustic dust removal equipment;

[0067] The wet-wet electrostatic composite dust removal system is: new OG / semi-dry method / annular gap combined composite acoustic wave dust removal system + wet electrostatic.

[0068] The use of the converter primary dust removal system generally includes four process flows. Process 1: converter + vaporization flue + wet dust removal system + fan + gas detection instrument group + switching valve group + chimney / coal cooling equipment and gas tank.

[0069] In particular, some equipment in a wet dust removal system can be placed after the fan. For example, in a wet electrostatic composite dust removal system, the electrostatic device can be placed between the switching valve and the chimney. Another example is the acoustic wave device in an annular gap combined acoustic wave dust removal system, which can be placed between the switching valve and the chimney.

[0070] The dry dust removal system is characterized by the use of cooling equipment + dry electrostatic precipitator equipment, or cooling equipment + high-temperature bag dust removal equipment. The cooling equipment is an evaporative cooling tower or heat recovery cooling equipment.

[0071] Process Flow 2 is: converter + vaporization flue + cooling equipment + dry electrostatic precipitator + fan + silencer + gas detection instrumentation + switching valve + chimney / coal cooling equipment and gas cabinet. In particular, the coal cooling equipment can be pre-installed between the switching valve and fan.

[0072] Process Flow 3: Converter + Vaporization Flue + Cooling Equipment + High-Temperature Baghouse + Fan + Gas Detection Instrumentation + Switching Valve + Chimney / Coal Cooling Equipment and Gas Holder. In particular, the coal cooling equipment can be pre-installed between the switching valve and the fan.

[0073] Process Flow 4: Converter + Vaporization Flue + Cooling Equipment + Dry Electrostatic Precipitator + Fan + Muffler + Gas Detection Instrumentation + Switching Valve + Metal Filter Cartridge (or High-Temperature Bag Dust Collector) + Chimney / Coal Cooling Equipment and Gas Holder. Specifically, the metal filter cartridge (or high-temperature bag dust collector) can be placed before the fan or between the fan and the switching valve assembly. In particular, the coal cooling equipment can be placed before the switching valve and fan. However, if the metal filter cartridge (or high-temperature bag dust collector) is placed before the fan or between the fan and the switching valve assembly, the coal cooling equipment must be placed after the metal filter cartridge (or high-temperature bag dust collector).

[0074] For any of process flows 1-4: The entire piping system includes pipelines, dust removal equipment, and other components. Dust removal equipment includes cylindrical dust removal equipment, conical cylindrical dust removal equipment, and electrostatic precipitators. Electrostatic precipitators include vertical and horizontal types. Vertical electrostatic precipitators have a honeycomb cylindrical interior, while horizontal electrostatic precipitators are constructed by connecting several parallel substrates in series. The inlet and outlet are conical, and circular ring beams are located between the electric fields. For example, four electric fields are mounted on five ring beams, with the lower ends of the ring beams supported by brackets. The diameter of the ring beams is smaller than the diameter of the electric field housing.

[0075] And various equipments in all the above process flows are connected by pipelines.

[0076] The basic detection system and calibration system are both composed of gas concentration detection instruments and physical sensors; the physical sensors include temperature sensors, gas flow rate sensors, air pressure sensors, etc.

[0077] Furthermore, the calibration system is located between the basic detection system and the switching valve front-end detection system. The calibration system must be installed before the electrostatic precipitator at the front end of the switching valve. If the smelting system is not equipped with an electrostatic precipitator, the physical distance between the installation location of the calibration system and the switching valve is set to the time required for the switching valve to complete the valve action multiplied by the flue gas velocity, and then plus a preset safety reserve distance.

[0078] The valve action time refers to the time from the start of valve switching to the completion of valve switching.

[0079] The characteristic gas is a flue gas in which the concentration of various gases in the flue gas is within a certain specified value range. For example, for the characteristic gas designed for coal gas recovery, when the presence of characteristic gases with an oxygen concentration of less than 2% and a carbon monoxide concentration greater than 20% is detected, the coal gas recovery starts; when the presence of characteristic gases with an oxygen concentration greater than 2% or a carbon monoxide concentration less than 20% is detected, the coal gas recovery stops. For another example, for the characteristic gas of explosive flue gas, the oxygen concentration range is [5%, 7%] with 6% as the core, and the carbon monoxide concentration range is [9%, 13%]. Characteristic gases also include flue gas with only one gas concentration, for example, flue gas with an oxygen concentration of 1.5%; for different characteristic gas types, the detection function of the basic detection system is adjusted accordingly to ensure that the corresponding characteristic gas type is detected.

[0080] Furthermore, the time when the characteristic point of the characteristic gas is detected is the time from the basic detection system to the calibration system;

[0081] The characteristic parameters describing the characteristic points of the characteristic gas include at least one physical parameter.

[0082] Furthermore, the historical detection data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system and then from the calibration system to the switching valve front-end detection system are collected in the following manner:

[0083] Collect the gas concentration detected by the basic detection system and the calibration system, the physical parameters collected by various physical sensors, and the flow time from the basic detection system to the calibration system to form historical comparison detection data;

[0084] The gas concentration of characteristic gases detected at the basic detection system, the physical parameters collected by various physical sensors, and the flow time from the calibration system to the switching valve front-end detection system are collected to form historical reference detection data.

[0085] Furthermore, during the actual operation, the method for collecting the actual control test data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system is:

[0086] During actual operation, the actual control detection data is formed by collecting the gas concentration of characteristic gases detected in the basic detection system and the calibration system, the physical parameters collected by various physical sensors, and the circulation time from the basic detection system to the calibration system.

[0087] Furthermore, the method of screening out similar historical operation processes based on the comparison of the time actually detected from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system in the historical operation process is as follows:

[0088] Mark the number of each historical running process as n;

[0089] The duration from the basic detection system to the proofreading system during the nth historical operation is marked as THn;

[0090] The time from the basic detection system to the proofreading system in the actual operation process is marked as TR;

[0091] Calculate the time difference value TDn between TR and THn of any n-th historical running process; wherein the calculation formula of the time difference value TDn is: TDn = |TR-THn|;

[0092] A time approximation threshold is set in advance, and from all historical running processes, the historical running processes whose time difference value TDn is less than the time approximation threshold are screened out to form a screening process set;

[0093] The physical parameters collected by each physical sensor are numbered as f;

[0094] The value of the f-th physical parameter collected by the basic detection system during the n-th historical operation is marked as ZHSnf;

[0095] The value of the fth physical parameter collected by the calibration system during the nth historical operation is marked as ZHCnf;

[0096] The value of the fth physical parameter collected by the basic detection system during the actual operation is marked as ZRSf;

[0097] The value of the fth physical parameter collected by the calibration system during the actual operation is marked as ZRCf;

[0098] Calculate the parameter differences in the basic detection system and the calibration system during each historical operation process and the actual operation process respectively;

[0099] Specifically, at the basic detection system, the parameter difference of the fth physical parameter is marked as ZDSnf;

[0100] Where ZDSnf = |ZHSnf - ZRSf|;

[0101] At the calibration system, the parameter difference of the f-th physical parameter is marked as ZDCnf; wherein ZDCnf = |ZHCnf - ZRCf|;

[0102] According to the parameter difference and time difference of each physical parameter, the matching degree Pn of the nth historical operation process in a screening process set is calculated;

[0103] The calculation formula of the matching degree is:

[0104] Pn=wt×TDn+Σ f wf×(ZDSnf+ZDCnf);

[0105] Among them, wt is the weight of the time difference value, wf is the weight of the f-th physical parameter;

[0106] From the set of screening processes, Q historical running processes with the smallest matching degree Pn are screened out as the set of similar historical running processes; Q is the preset number of similar historical running processes.

[0107] Specifically, wt and wf can be pre-set or obtained by function fitting according to the historical operation process; that is, in the historical operation process, the difference in the time from the basic detection system to the proofreading system in each two historical operations is used as the matching label of the fitting model, and then the matching degree is used as the prediction target of the fitting model. wt and wf are randomly initialized to construct the loss function: Loss = Σ m≤M (Pm-Rm) 2 , where m represents the number of the combination of any two historical running processes, and M is the number of all combinations of two historical running processes; Pm is calculated by the matching calculation formula of the mth combination, and Rm is the matching label; wt and wf in the fitting model are continuously updated by using the gradient descent algorithm until the loss function converges. The wt and wf at the final convergence are used as the weight values of the corresponding weights in the matching calculation formula.

[0108] Furthermore, the method for calculating the action time based on the historical detection data of the set of similar historical operation processes is:

[0109] Mark the number of each historical running process in the set of similar historical running processes as q;

[0110] The time it takes for the characteristic gas to travel from the calibration system to the front-end detection system of the switching valve during the qth historical operation is expressed as the reference time and marked as Xq;

[0111] The matching degree between the qth historical running process and the actual running process is expressed as the reference matching degree and marked as Pq;

[0112] Calculate the action time based on the reference duration Xq and the reference matching degree Pq;

[0113] Preferably, the calculation formula for the action time is:

[0114] Among them, AT is the action time; it can be understood that, the greater the reference matching degree Pq in the formula, the greater the influence of the corresponding historical operation process on the calculation result of the action duration, that is, the more similar the actual operation process is to it, the closer the flow time from the calibration system to the front-end detection system of the switching valve in the actual operation process is, thereby realizing the fitting estimation of the action time in the actual operation process by finding the flow process of characteristic gases with similar history, providing a basis for early valve switching.

[0115] Furthermore, the timing moment is the base moment plus the warning time; the warning time is: the minimum action time minus the valve action time, minus a preset safety time greater than 0.

[0116] It should be noted that the above-mentioned gas recovery and control method based on automatic control and data processing can also be used in the explosion-proof system of the primary dry electrostatic precipitator of the converter. That is, in the primary dry electrostatic precipitator system of the converter, explosive flue gas is sometimes generated. When the explosive flue gas passes through the dry electrostatic precipitator, if sparks are generated inside the dry electrostatic precipitator, an explosion will occur inside the dry electrostatic precipitator. For example, the characteristic explosive flue gas is: oxygen concentration is 6%, and carbon monoxide concentration is 11%. Therefore, a detection system is added to the front end of the dry electrostatic precipitator, and a calibration system is installed between the detection system in front of the dry electrostatic precipitator and the basic detection system. If the basic detection system detects explosive flue gas, the same method is adopted to calculate the timing moment from the basic detection system to the detection system in front of the electrostatic precipitator based on the basic moment and the action time. At this time, the valve action time does not need to be considered. When the explosive flue gas circulation time reaches the timing moment, the control system of the electrostatic precipitator reduces the voltage or shuts down the electric field to prevent sparks from occurring inside the electrostatic precipitator, thereby preventing explosion from occurring inside the electrostatic precipitator. After the explosive flue gas passes through the electrostatic precipitator, the electrostatic precipitator returns to normal working state. This method of predicting the moment when explosive flue gas arrives before the electrostatic precipitator is also protected by the present invention.

[0117] In a further preferred embodiment:

[0118] A proofreading and detection system can also be added to the front end of the electrostatic precipitator. The time it takes for the characteristic points of explosive flue gas to be detected from the basic detection system to the proofreading system is compared with the data during historical operation to predict the time when the characteristic gas arrives at the proofreading and detection system at the front end of the electrostatic precipitator, and then determine whether the electrostatic precipitator should be depressurized or shut down, thereby preventing explosion inside the electrostatic precipitator when explosive flue gas passes through the electrostatic precipitator. The time it takes for the characteristic points of the characteristic gas to arrive at the front end of the electrostatic precipitator is predicted, and then the time when the explosive flue gas arrives at and leaves the electrostatic precipitator is predicted.

[0119] In a further preferred embodiment:

[0120] The calibration system can also be integrated with the basic detection system. In this case, when the basic detection system detects a characteristic gas, it directly retrieves all the time sets that match the characteristic gas from the basic detection system to the switching valve front-end detection system, selects the minimum value as the action time, and calculates the timing time based on the basic time, the action time, and the valve action time. This solution is also within the scope of protection of the present invention.

[0121] Example 2

[0122] like Figure 2 As shown, the gas recovery control system based on automatic control and data processing includes a historical data collection module, an actual data collection module, a data comparison module and a valve switching module; wherein each module is electrically connected;

[0123] The historical data collection module is installed at the front end of the detection system at the front end of the switching valve. The basic detection system and the calibration system are installed in sequence. The module collects historical detection data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system and then from the calibration system to the detection system at the front end of the switching valve during N historical operations, and sends the historical detection data to the data comparison module.

[0124] The actual data collection module collects the actual control test data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system during the actual operation, and sends the actual control test data to the data control module;

[0125] The data comparison module compares the actual detected time from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system during the historical operation process, selects a set of similar historical operation processes, calculates the action time based on the historical detection data of the similar historical operation process set, and sends the action time to the valve switching module;

[0126] The valve switching module sets the moment when the calibration system detects the characteristic gas characteristic point as the basic moment, calculates the timing moment based on the basic moment, the action time and the valve action time. When the timing moment is reached, the automatic control system triggers the valve switching to switch the gas from the recovery section to the discharge section.

[0127] In addition, the parts of the above technical solutions provided in the embodiments of the present application that are consistent with the implementation principles of the corresponding technical solutions in the prior art are not described in detail to avoid excessive redundancy.

[0128] The above-described specific embodiments further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0129] The above preset parameters or preset thresholds are all set by those skilled in the art according to actual conditions or obtained through large amounts of data simulation.

[0130] The above embodiments are only used to illustrate the technical method of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A gas recovery control method based on automatic control and data processing, characterized in that: The following steps are involved: Step 1: Install the basic detection system and calibration system in sequence at the front end of the detection system at the front end of the switching valve; Step 2: Collect historical detection data of characteristic gas characteristic points during the flow from the basic detection system to the calibration system and then from the calibration system to the switching valve front-end detection system during N historical operations; N is the preset number of historical operations; Step 3: During the actual operation, collect the actual control test data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system; Step 4: Compare the actual time from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system during historical operation, select a set of similar historical operation processes, and calculate the action time based on the historical detection data of the similar historical operation process set; Step 5: Set the moment when the calibration system detects the characteristic gas characteristic point as the basic moment, and calculate the timing moment according to the basic moment, action time and valve action time. When the timing moment is reached, the automatic control system triggers the valve switching to switch the gas from the recovery section to the discharge section.

2. The gas recovery control method based on automatic control and data processing according to claim 1 is characterized in that: The basic detection system and calibration system are both composed of gas concentration detection instruments and physical sensors; The proofreading system is located between the basic detection system and the front-end detection system of the switching valve. The proofreading system is installed before the electrostatic precipitator at the front end of the switching valve. If the electrostatic precipitator is not configured in the smelting system, the physical distance between the installation position of the proofreading system and the switching valve is set to the time required for the switching valve to complete the valve action multiplied by the flue gas velocity, and then plus a preset safety reserve distance.

3. The gas recovery control method based on automatic control and data processing according to claim 2 is characterized in that: The historical detection data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system and then from the calibration system to the switching valve front-end detection system are collected in the following manner: Collect the gas concentration detected by the basic detection system and the calibration system, the physical parameters collected by various physical sensors, and the flow time from the basic detection system to the calibration system to form historical comparison detection data; The gas concentration of characteristic gases detected at the basic detection system, the physical parameters collected by various physical sensors, and the flow time from the calibration system to the switching valve front-end detection system are collected to form historical reference detection data.

4. The gas recovery control method based on automatic control and data processing according to claim 3 is characterized in that: In the actual operation process, the method of collecting the actual comparison detection data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system is: During actual operation, the actual control detection data is formed by collecting the gas concentration of characteristic gases detected in the basic detection system and the calibration system, the physical parameters collected by various physical sensors, and the circulation time from the basic detection system to the calibration system.

5. The gas recovery control method based on automatic control and data processing according to claim 4 is characterized in that: The method of screening out similar historical operation processes based on the comparison of the time actually detected from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system in the historical operation process is as follows: Mark the number of each historical running process as n; The duration from the basic detection system to the proofreading system during the nth historical operation is marked as THn; The time from the basic detection system to the proofreading system in the actual operation process is marked as TR; Calculate the time difference value TDn between TR and THn of any n-th historical running process; wherein the calculation formula of the time difference value TDn is: TDn = |TR-THn|; A time approximation threshold is set in advance, and from all historical running processes, the historical running processes whose time difference value TDn is less than the time approximation threshold are screened out to form a screening process set; The physical parameters collected by each physical sensor are numbered as f; The value of the fth physical parameter collected by the basic detection system during the nth historical operation is marked as ZHSnf; The value of the fth physical parameter collected by the calibration system during the nth historical operation is marked as ZHCnf; The value of the fth physical parameter collected by the basic detection system during the actual operation is marked as ZRSf; The value of the fth physical parameter collected by the calibration system during the actual operation is marked as ZRCf; Calculate the parameter differences in the basic detection system and the calibration system during each historical operation process and the actual operation process respectively; At the basic detection system, the parameter difference of the fth physical parameter is marked as ZDSnf; At the calibration system, the parameter difference of the fth physical parameter is marked as ZDCnf; According to the parameter difference and time difference of each physical parameter, the matching degree Pn of the nth historical operation process in a screening process set is calculated; From the set of screening processes, Q historical running processes with the smallest matching degree Pn are screened out as the set of similar historical running processes; Q is the preset number of similar historical running processes.

6. The gas recovery control method based on automatic control and data processing according to claim 5, characterized in that: The method of calculating the action time based on the historical detection data of the set of similar historical operation processes is: Mark the number of each historical running process in the set of similar historical running processes as q; The time it takes for the characteristic gas to travel from the calibration system to the front-end detection system of the switching valve during the qth historical operation is expressed as the reference time and marked as Xq; The matching degree between the qth historical running process and the actual running process is expressed as the reference matching degree and marked as Pq; Based on the reference duration Xq and the reference matching degree Pq, the action time is calculated.

7. The gas recovery control method based on automatic control and data processing according to claim 6, characterized in that: The timing moment is the base moment plus the warning time; the warning time is: the minimum action time minus the valve action time, minus the preset safety time greater than 0.

8. The gas recovery control method based on automatic control and data processing according to claim 7, characterized in that: The valve action time refers to the time from the start of valve switching to the completion of valve switching.

9. A gas recovery control system based on automatic control and data processing, which is used to implement the gas recovery control method based on automatic control and data processing according to any one of claims 1 to 8, characterized in that: It includes a historical data collection module, an actual data collection module, a data comparison module and a valve switching module; wherein each module is electrically connected; The historical data collection module is installed at the front end of the detection system at the front end of the switching valve. The basic detection system and the calibration system are installed in sequence. The module collects historical detection data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system and then from the calibration system to the detection system at the front end of the switching valve during N historical operations, and sends the historical detection data to the data comparison module. The actual data collection module collects the actual control test data of the characteristic gas characteristic points during the flow from the basic detection system to the calibration system during the actual operation, and sends the actual control test data to the data control module; The data comparison module compares the actual detected time from the basic detection system to the proofreading system with the time from the basic detection system to the proofreading system during the historical operation process, selects a set of similar historical operation processes, calculates the action time based on the historical detection data of the similar historical operation process set, and sends the action time to the valve switching module; The valve switching module sets the moment when the calibration system detects the characteristic gas characteristic point as the basic moment, calculates the timing moment based on the basic moment, the action time and the valve action time. When the timing moment is reached, the automatic control system triggers the valve switching to switch the gas from the recovery section to the discharge section.

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