WO2020233106A1 - Système de chauffage à pression positive de four à coke et procédé de régulation de température - Google Patents

Système de chauffage à pression positive de four à coke et procédé de régulation de température Download PDF

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Publication number
WO2020233106A1
WO2020233106A1 PCT/CN2019/124480 CN2019124480W WO2020233106A1 WO 2020233106 A1 WO2020233106 A1 WO 2020233106A1 CN 2019124480 W CN2019124480 W CN 2019124480W WO 2020233106 A1 WO2020233106 A1 WO 2020233106A1
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WIPO (PCT)
Prior art keywords
oven
control
positive pressure
gas
opening
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PCT/CN2019/124480
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English (en)
Chinese (zh)
Inventor
王常海
李超
王晓东
何鸥
张熠
李申明
马兴翼
姜文波
刘超
王慧璐
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中冶焦耐自动化有限公司
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Priority to RU2021109238A priority Critical patent/RU2761604C1/ru
Priority to JP2021542255A priority patent/JP7110497B2/ja
Priority to BR112021007609A priority patent/BR112021007609A2/pt
Publication of WO2020233106A1 publication Critical patent/WO2020233106A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B17/00—Preheating of coke ovens
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B41/00—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/058—Safety, monitoring
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
    • G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/16—Plc to applications
    • G05B2219/163—Domotique, domestic, home control, automation, smart, intelligent house

Definitions

  • This application relates to the technical field of coke oven ovens, and in particular to a coke oven positive pressure oven system and temperature control method.
  • the oven is an important and complicated process before the coke oven is put into production, and its quality has a vital influence on the life of the coke oven.
  • the advantages of the positive pressure oven method are becoming more and more obvious.
  • the existing coke oven positive pressure oven system is difficult to accurately control the oven temperature.
  • the purpose of this application includes providing a coke oven positive pressure oven system and a temperature control method, so as to improve the problem of low oven temperature control accuracy of the coke oven positive pressure oven system in the prior art.
  • the present application provides a coke oven positive pressure oven system, which includes a plurality of gas branch pipes connected to a main gas pipeline of an oven, and each gas branch pipe is connected to a positive pressure oven device; characterized in that: It also includes an oven gas main pipeline pressure transmitter and a main pipeline electric regulating valve. Both the oven gas main pipeline pressure transmitter and the main pipeline electric regulating valve are electrically connected to the positive pressure oven control system.
  • the electric control valve of the main gas pipeline of the oven is installed upstream of all the gas branch pipes, and the shut-off valve of the main gas main pipeline of the oven is installed on the electric control valve of the main gas pipeline of the oven. Upstream.
  • the pressure transmitter of the main gas pipeline of the oven is arranged upstream of all the gas branch pipes and downstream of the electric regulating valve of the main gas pipeline of the oven.
  • the positive pressure oven device includes a first burner, a second burner, a gas inlet pipe, and an air inlet pipe, and a branch of the gas inlet pipe passes through a first gas branch pipe regulating valve Connected to the air inlet of the first combustor, and the other branch of the gas inlet pipe is connected to the air inlet of the second burner through the second gas branch regulating valve; the branch of the air inlet pipe is connected to the first The air inlet of one burner is connected, and the other branch is connected to the air inlet of the second burner.
  • a gas protection shut-off valve is provided on the gas intake pipe.
  • an air blower is connected to the upstream end of the air intake pipe.
  • the positive pressure oven device further includes a control box, the first gas branch pipe regulating valve and the second gas branch pipe regulating valve are electrically connected to the control box, and the control box It is electrically connected with the positive pressure oven control system.
  • the positive pressure oven device further includes:
  • the first thermocouple is used to measure the flame temperature of the first burner
  • the second thermocouple is used to measure the flame temperature of the second burner
  • the first high-energy igniter is used to ignite the first burner
  • the second high-energy igniter is used to ignite the second burner.
  • the gas pipeline in the room is a metal hose.
  • the air intake pipe is a PVC hose.
  • each of the gas branch roads is provided with an oven gas branch pipeline shut-off valve.
  • the positive pressure oven control system is configured as:
  • the opening degree of the electric regulating valve of the main gas pipeline of the oven is calculated and adjusted to ensure the stability of the oven gas pressure during the oven process.
  • the embodiments of the present application provide a temperature control method of a coke oven positive pressure oven system, and the control method includes the following:
  • the feedback value of the opening of the gas branch control valve is introduced into the control loop to form a cascade adjustment.
  • the temperature control of the coke oven oven is the main loop, and the opening of the gas branch control valve Control as secondary ring;
  • the calculation formula for the opening control amount of the main pipeline electric regulating valve is as follows:
  • u k u k-1 +(Ae k -Be k-1 +Ce k-2 )
  • u k control valve opening control quantity at moment k ;
  • e k The deviation between the actual pressure at time k and the target pressure; the actual pressure is measured by the system, the target pressure is manually set, and the target pressure must be kept constant throughout the adjustment process;
  • T, T i , T d respectively proportional, integral, and derivative time constants.
  • the feedback value of the opening of the gas branch pipe regulating valve is introduced into the control loop to form a cascade adjustment step, which specifically includes:
  • the positive pressure oven process optimization computer reads the oven heating plan temperature in the coke oven oven temperature measurement computer and the measured current temperature and pressure of the coke oven through the OPC gateway;
  • the positive pressure oven process optimization computer sends the calculated reasonable opening degree of each gas branch control valve to each control valve, and reads the opening feedback of each gas branch control valve at the same time;
  • the positive pressure oven process optimization computer compares the setting opening of each gas branch control valve with the actual feedback opening to determine whether each gas branch control valve has been adjusted to a reasonable opening range
  • the optimized control method of the positive pressure oven includes:
  • Furnace heating process modeling Smith predictive compensation control, human-like intelligent control, and adjacent combustion chamber temperature decoupling control; among them, the furnace heating process modeling includes the combustion chamber temperature, gas branch pressure, adjacent combustion chamber temperature and Analyze the relationship between the suction of the flue and determine the functional relationship between the temperature variable in the furnace and the control amount of the oven device; Smith predictive compensation control is through predictive calculation to avoid or reduce the lagging effect of the temperature control system; Intelligent control is to identify various characteristics of temperature deviation and make corresponding decisions, and calculate the control amount of the oven device; the temperature decoupling control of adjacent combustion chambers is to dynamically modify the control amount of the oven device according to the temperature changes of adjacent combustion chambers , Realize the temperature balance in the furnace.
  • the introduction of stable control of the pressure of the main gas pipeline can ensure the stability of the gas pressure of the oven during the entire oven process, eliminate the temperature of the positive pressure oven from being affected by the gas pressure of the main gas pipeline of the oven, and avoid the change of the gas pressure of the oven
  • the furnace temperature fluctuates to improve the temperature control accuracy
  • control of the opening of the gas branch regulating valve the control of the setting opening of the regulating valve is added to eliminate the air path difference, effectively avoiding the influence of the air path difference of the gas branch regulating valve of the coke oven positive pressure oven device on the oven temperature
  • the influence of control accuracy can effectively improve the quality of coke oven ovens.
  • Figure 1 is a schematic diagram of a coke oven positive pressure oven system in an embodiment of the application
  • FIG. 2 is a block diagram of the composition of a coke oven positive pressure oven system in an embodiment of the application
  • Figure 3 is a schematic diagram of a positive pressure oven device in an embodiment of the application.
  • FIG. 4 is a block diagram of the composition of a positive pressure oven device in an embodiment of the application.
  • Figure 5 is a configuration diagram of a positive pressure oven control system in an embodiment of the application.
  • Figure 6 is a flow chart of temperature control control in a coke oven positive pressure oven device in an embodiment of the application.
  • Icon 1- Oven gas main pipeline shut-off valve; 2- Oven gas main pipeline electric regulating valve; 3- Oven gas main pipeline pressure transmitter; 4- Oven gas branch pipeline shut-off valve; 5- Positive pressure drying Furnace device; 51- gas intake pipe; 511- gas protection shut-off valve; 52- first gas branch pipe regulating valve; 53- second gas branch pipe regulating valve; 54- first burner; 541- first thermocouple; 542- First high-energy igniter; 55-second burner; 551-second thermocouple; 552-second high-energy igniter; 56-air fan; 57-air intake pipe; 58-control box.
  • the purpose of the oven is to remove the natural water and crystal water in the substrate of the furnace body, so as to avoid the furnace body from bursting, bubbling or deforming or even the furnace wall collapsing due to the rapid rise of the furnace temperature during the start of work, and the large amount of water expansion. Affect the strength and service life of the furnace wall.
  • Existing coke ovens often have an oven process before they are put into production. As the coke oven becomes larger, the positive pressure oven method has obvious advantages. Especially for coke ovens of 7.63m and above, positive pressure ovens are often used for ovens. The oven process itself has a vital influence on the life of the coke oven, and its temperature needs to be accurately controlled.
  • the existing coke oven positive pressure oven system has the following shortcomings:
  • the temperature of the positive pressure oven is greatly affected by the gas pressure of the main gas pipeline of the oven.
  • the gas source pressure of the oven fluctuates, it is often unable to be adjusted in time, resulting in a relatively large change in the oven temperature. Affect the quality of the oven, but also bring a greater workload to the oven personnel.
  • the gas branch control valves of the current positive pressure oven system have a certain gap between them, the regulating valve cannot accurately execute the control volume issued by the positive pressure oven control system. Therefore, the oven temperature is controlled. The accuracy has a greater impact, especially when the coke oven temperature is low at the beginning of the oven, the impact is more serious.
  • embodiments of the present application provide a coke oven positive pressure oven system and temperature control method.
  • the specific implementation manners provided by this application will be described in detail below in conjunction with the drawings.
  • FIG. 1 is a schematic diagram of a coke oven positive pressure oven system in an embodiment of this application
  • Figure 2 is a block diagram of a coke oven positive pressure oven system in an embodiment of this application.
  • the coke oven positive pressure oven system includes the oven gas main pipeline shut-off valve 1, the oven gas main pipeline electric regulating valve 2, the oven gas main pipeline pressure transmitter 3, the oven gas Branch pipeline cut-off valve 4, positive pressure oven device 5, positive pressure oven control system 6.
  • the main gas pipeline of the oven is used to provide gas to the gas branch pipe, and the gas branch pipe provides gas to the positive pressure oven device 5 for the oven process.
  • the main gas pipeline of the oven is connected to multiple gas branch pipes, and the gas branch pipe cutoff valve 4 of the oven is arranged on the gas branch pipe.
  • Each gas branch pipe is connected to one or more gas branch pipe regulating valves of a positive pressure oven device 5 (see Figure 3).
  • the pressure transmitter 3 of the main gas pipeline of the oven, the positive pressure oven device 5 and the electric regulating valve 2 of the main gas main pipeline of the oven are electrically connected to the positive pressure oven control system.
  • the electric regulating valve 2 of the main gas pipeline of the oven is installed upstream of all gas branch pipes.
  • the pressure transmitter 3 of the main gas pipeline of the oven is arranged upstream of all the gas branch pipes and downstream of the electric regulating valve 2 of the main gas main pipeline of the oven.
  • the oven gas main pipeline shut-off valve 1 is arranged upstream of the electric regulating valve 2 of the oven gas main pipeline.
  • the positive pressure oven device 5 can be a positive pressure oven device in the prior art.
  • the positive pressure oven device 5 includes two sets of burners, a gas inlet pipe 51, and an air inlet pipe 57. Two sets of burners correspond to the two-hole coking chambers, respectively, the first burner 54 and the second burner 55.
  • the gas inlet pipe 51 is provided with a gas protection shut-off valve 511, and a branch of the gas inlet pipe 51 passes through the second burner.
  • a gas branch pipe regulating valve 52 is connected to the air inlet of the first combustor 54, and the other branch of the gas gas pipe 1 is connected to the air inlet of the second burner 55 through a second gas branch pipe regulating valve 53.
  • the gas pipeline between the first gas branch regulating valve 52 and the air inlet of the first burner 54 and between the second gas branch regulating valve 53 and the air inlet of the second burner 55 may be metal hoses.
  • the remaining gas pipelines can be galvanized pipes.
  • the inlet of the air intake pipe 57 is provided with an air fan 56.
  • One branch of the air intake pipe 57 is connected to the air inlet of the first combustor 54 and the other branch of the air intake pipe 57 is connected to the inlet of the second combustor 55.
  • the air port is connected, and the air blower 56 has a manually adjusted damper (not shown in the figure) at the fan inlet.
  • the air intake pipe 57 may be a PVC hose.
  • the first burner 54 is provided with a first thermocouple 541 and a first high-energy igniter 542, and the second burner 55 is provided with a second thermocouple 551 and a second high-energy igniter 552.
  • the positive pressure oven device 5 also includes a control box 58, the gas protection shut-off valve 511, the first gas branch pipe regulating valve 52, the first thermocouple 541, the first high-energy igniter 542, the second gas branch pipe regulating valve 53, the first The second thermocouple 551, the second high-energy igniter 552 and the air blower 56 are all connected to the control box 58 through cables.
  • the control box 58 is electrically connected with the positive pressure oven control system 6.
  • the gas protection cut-off valve 511 is used to cut off the gas, and the first and second gas control valves (52, 53) are used to adjust the gas flow.
  • the first and second thermocouples (541, 551) are used to measure the flame temperature in the burner.
  • the flame temperature is used to judge the burning situation of the flame. When the flame is extinguished, the gas will be interlocked and cut off immediately to avoid safety accidents; High-energy igniters (542, 552) are used for ignition.
  • the controller in the control box 58 monitors the monitoring signals of the gas protection shut-off valve 511, the air blower 56, the gas regulating valve (52, 53), the thermocouple (541, 551), and the high-energy igniter (542, 552) to realize the Remote monitoring, each device has its own alarm device (not shown in the figure).
  • the alarms generated by the various devices on the oven site inform the oven personnel in time and accurately, avoiding safety accidents to the greatest extent.
  • the fuel gas can be coal gas or other combustible gas, such as natural gas.
  • the gas inlet pipe 51 is connected to the gas branch pipe.
  • the gas protection cut-off valve 511 may be omitted, and only the oven gas branch pipe cut-off valve 4 on the gas branch pipe is retained, and the oven gas branch pipe cut-off valve 4 It is connected to the control box 58 so that it has the same function as the gas protection shutoff valve 511 described above.
  • the positive pressure oven device 5 please refer to the one-to-two positive pressure oven device disclosed in the patent publication number CN109439345A.
  • the coke oven positive pressure oven system may also include a temperature sensor and a pressure sensor for measuring the current temperature and current pressure of the coke oven, and the temperature sensor and pressure sensor are electrically connected to the positive pressure oven control system 6.
  • the pressure of the main gas pipeline of the oven is used as the controlled object, and the deviation of the actual pressure from the target pressure and the rate of change of the deviation are automatically calculated and adjusted in real time to ensure that the opening of the electric regulating valve 2 of the main gas pipeline of the oven is adjusted.
  • the gas pressure of the oven during the furnace is stable.
  • the calculation formula for the opening control amount of the main pipeline electric regulating valve is as follows:
  • u k u k-1 +(Ae k -Be k-1 +Ce k-2 )
  • u k control valve opening control quantity at moment k ;
  • e k The deviation between the actual pressure at time k and the target pressure; the actual pressure is measured by the system, the target pressure is manually set, and the target pressure must be kept constant throughout the adjustment process;
  • T, T i , T d respectively proportional, integral, and derivative time constants.
  • Fig. 5 is a configuration diagram of a positive pressure oven control system in an embodiment of the application
  • Fig. 6 is a temperature control control flow chart of a coke oven positive pressure oven device in an embodiment of the application. As shown in Figures 5 and 6, the temperature control method includes:
  • the feedback value of the opening of the gas branch control valve is introduced into the control loop to form a cascade adjustment.
  • the temperature control of the coke oven oven is the main loop, and the opening of the gas branch pipe regulating valve is controlled as the secondary loop, which specifically includes the following steps:
  • the positive pressure oven process optimization computer reads the oven heating plan temperature in the coke oven oven temperature measurement computer and the measured current temperature and pressure of the coke oven through the OPC gateway.
  • a temperature sensor can be used to measure the current temperature of the coke oven
  • a pressure sensor can be used to measure the current pressure of the coke oven.
  • the optimized control method of the positive pressure oven includes: oven heating process modeling, Smith predictive compensation control, human-like intelligent control, and adjacent combustion chamber temperature decoupling control; among them, the oven heating process modeling The relationship between the combustion chamber temperature, the gas branch pipe pressure, the adjacent combustion chamber temperature and the suction of the sub-flue is analyzed, and the functional relationship between the temperature variable in the furnace and the control quantity of the oven device is determined; Smith predicts the compensation control through Predictive calculations can avoid or reduce the lag effect of the temperature control system; human-like intelligent control is to identify various characteristics of temperature deviation and make corresponding decisions, calculate the control amount of the oven device; the adjacent combustion chamber temperature decoupling control is based on The temperature changes of adjacent combustion chambers dynamically correct the control quantity of the oven device to realize the temperature balance in the furnace.
  • the specific method can also refer to the optimization control method of positive pressure oven disclosed in the patent with publication number CN 105700383B in the prior art.
  • the positive pressure oven process optimization computer sends the calculated reasonable opening degree of each gas branch control valve to each control valve, and reads the feedback of the opening degree of each gas branch control valve at the same time.
  • the positive pressure oven process optimization computer determines whether each gas branch control valve has been adjusted to a reasonable opening range by comparing the setting opening of each gas branch control valve with the actual feedback opening.
  • control of the opening degree of the gas branch pipe regulating valve the control of the setting opening degree of the regulating valve is added to eliminate the air travel difference, which specifically includes:
  • Utilizing the coke oven positive pressure oven technology provided in this application can realize automatic real-time adjustment of the pressure of the main gas pipeline of the oven, ensure the stability of the gas pressure during the entire oven process, and at the same time overcome the coke oven positive pressure oven gas
  • the influence caused by the difference in the air path of the branch control valve can accurately control the temperature of the oven and improve the automatic temperature control accuracy of the positive pressure oven system. Therefore, the quality of the oven is also improved.
  • the coke oven positive pressure oven system and temperature control method of the present application can realize automatic real-time adjustment of the pressure of the main gas pipeline of the oven, ensure the stability of the gas pressure during the entire oven process, and can overcome the coke oven positive pressure oven device
  • the influence caused by the difference in the air path of the gas branch pipe regulating valve can accurately control the temperature of the oven and improve the automatic temperature control accuracy of the positive pressure oven system.

Abstract

La présente invention concerne un système de chauffage à pression positive de four à coke et un procédé de régulation de température. Le procédé consiste à : prendre la pression dans la conduite de gaz de chauffage principale en tant qu'objet à commander, calculer et réguler automatiquement en temps réel l'ouverture d'une soupape de régulation électrique de conduite de gaz de chauffage principale (2) selon l'écart entre une pression réelle et une pression cible, ainsi que le taux de changement d'écart, de façon à garantir la stabilité de la pression de gaz de chauffage tout au long du processus de chauffage ; par rapport à la commande d'un dispositif de chauffage à pression positive (5), introduire une valeur de rétroaction de l'ouverture d'une soupape de régulation de conduite de gaz de chauffage de dérivation dans une boucle de commande pour permettre une régulation en cascade, une boucle principale étant destinée à réguler la température de chauffage de four à coke et une boucle secondaire étant destinée à commander l'ouverture de ladite soupape de régulation ; par rapport à la commande de l'ouverture de ladite soupape de régulation, ajouter une commande de l'ouverture par défaut de ladite soupape de régulation de façon à éliminer un jeu, permettant ainsi de surmonter l'effet provoqué par le jeu de ladite soupape de régulation dans le dispositif de chauffage à pression positive de four à coke, de réguler avec précision la température de chauffage, et d'améliorer la précision de la régulation automatique de température du système de chauffage à pression positive.
PCT/CN2019/124480 2019-05-22 2019-12-11 Système de chauffage à pression positive de four à coke et procédé de régulation de température WO2020233106A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
RU2021109238A RU2761604C1 (ru) 2019-05-22 2019-12-11 Система обогрева коксовой печи при положительном давлении и способ управления температурой
JP2021542255A JP7110497B2 (ja) 2019-05-22 2019-12-11 コークス炉陽圧予熱システム及び温度制御方法
BR112021007609A BR112021007609A2 (pt) 2019-05-22 2019-12-11 Sistema de aquecimento de pressão positiva de forno de coque e método de controle de temperatura

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CN201910426581.8A CN110244803A (zh) 2019-05-22 2019-05-22 一种焦炉正压烘炉系统及温度控制方法
CN201910426581.8 2019-05-22

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CN (1) CN110244803A (fr)
BR (1) BR112021007609A2 (fr)
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WO (1) WO2020233106A1 (fr)

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