Automatic execution system and method for ethylene cracking furnace hearth steam cutting into quench tower process

Abstract

The present application relates to the technical field of petroleum chemical industry, in particular to an automatic execution system and method for ethylene cracking furnace hearth steam cutting into a quench tower process, which comprises a state confirmation module before cutting into the quench tower, used for confirming initial parameters before the cracking furnace hearth steam cutting into the quench tower, and indicating that the cutting into the quench tower can be performed when the initial parameters are within an initial range; an intelligent control module for the cutting into the quench tower process, used for controlling cutting key parameters in the cutting into the quench tower stage, and issuing control instructions; and a cutting into the quench tower execution module, used for cutting into the quench tower according to the control instructions of the intelligent control module for the cutting into the quench tower process in the cutting into the quench tower stage. By confirming the state before cutting into the quench tower and then controlling the cutting key parameters in the cutting into the quench tower stage, the stability of the system in the cutting into the quench tower process can be effectively improved, and the system has the advantages of high cutting efficiency and high safety.

Description

Technical Field

[0001] This invention relates to the field of petrochemical technology, specifically to an automated system and method for the process of steam cutting into a quench tower in an ethylene cracking furnace. Background Technology

[0002] Ethylene is a crucial basic raw material in the petrochemical industry and one of the petrochemical products with the largest demand and production volume. Its output, scale, and technological level signify the development level of a country's petrochemical industry. The tubular cracking furnace, used for hydrocarbon cracking, is the core unit for ethylene production, determining the overall production capacity, stable operation, and overall energy consumption of the entire ethylene plant. When hydrocarbons undergo steam cracking reactions in the radiant section of the tubular cracking furnace, secondary reactions such as polymerization and condensation occur, leading to coke accumulation on the inner wall of the furnace tubes, forming coke deposits. When coking causes the temperature of the outer wall of the radiant section furnace tubes, the outlet temperature of the quench boiler, or the pressure difference across the venturi tubes to reach the production limit, it severely impacts ethylene production, causing a decrease in ethylene yield, increased energy consumption, shortened furnace tube life, and even affecting production safety. Therefore, in actual production, regular furnace cleaning is essential to ensure normal operation. After furnace cleaning or maintenance, the furnace steam is usually cut into the quench tower.

[0003] Currently, the furnace cutting process of most ethylene cracking furnaces in China is still manually controlled. Manually cutting the furnace steam into the quench tower requires frequent operation by technicians, which is not only labor-intensive, inefficient, and prone to errors, but also relies entirely on personal experience and the operator's responsibility. It is also difficult to accurately control key parameters such as the furnace negative pressure during the cutting process, which can easily cause large fluctuations in key parameters, resulting in system instability and significant safety hazards.

[0004] Therefore, there is an urgent need for an automated system and method for the process of steam cutting into the quench tower in an ethylene cracking furnace. Summary of the Invention

[0005] This invention addresses the problem that in the prior art, the process of cutting steam into the quench tower from the furnace of an ethylene cracking furnace is operated manually based on experience, which easily leads to large fluctuations in parameters such as the negative pressure in the cracking furnace during the process of cutting into the quench tower, resulting in low cutting efficiency, poor system stability and safety. The invention provides an automatic execution system and method for the process of cutting steam into the quench tower from the furnace of an ethylene cracking furnace.

[0006] To achieve the above objectives, the first aspect of this invention provides an automated system for the process of cutting steam into the quench tower in an ethylene cracking furnace, the system comprising:

[0007] The pre-entry status confirmation module is used to confirm the initial parameters before the furnace steam of the cracking furnace enters the quench tower. When the initial parameters are within the initial range, it indicates that the quench tower can be entered. When the initial parameters are not within the initial range, it issues an alarm.

[0008] The intelligent control module for the furnace steam cut-in to the quench tower process is used to control the key parameters of the cut-in and issue control commands during the cut-in to the quench tower stage. The key parameters of the cut-in include the furnace single-pipe dilution steam flow rate, the pyrolysis furnace negative pressure, the calorific value of the fuel gas, and the ultra-high pressure steam temperature.

[0009] The furnace steam cut-in quench tower execution module is used to cut into the quench tower according to the control instructions of the furnace steam cut-in quench tower process intelligent control module during the cut-in quench tower stage.

[0010] Preferably, the step of issuing an alarm when the initial parameter is not within the initial range specifically includes:

[0011] When the initial parameter is not within the initial range, an alarm is triggered for one or more of the initial parameters that are not within the initial range.

[0012] Preferably, the initial parameters include the dilution steam flow rate of the single tube in the furnace, the outlet temperature of the pyrolysis furnace, the ultra-high pressure steam temperature, the negative pressure in the pyrolysis furnace, the injection amount of dimethyl disulfide in the single tube in the furnace, the oil pump outlet pressure of the quench tower, the quench oil level in the quench tower, and the calorific value of the fuel gas.

[0013] Preferably, the initial range of the dilution steam flow rate in the single tube of the furnace is 3500–5500 kg / h, the initial range of the pyrolysis furnace outlet temperature is 710–780°C, the initial range of the ultra-high pressure steam temperature is 480–525°C, the initial range of the negative pressure in the pyrolysis furnace is -45 to -20 Pa, the initial range of the dimethyl disulfide injection rate in the single tube of the furnace is 1–20 kg / h, the initial range of the oil pump outlet pressure in the quench tower is 1.1–2 MPa, the initial range of the quench oil level in the quench tower is 45–55%, and the initial range of the calorific value of the fuel gas is 11–13 MW.

[0014] Preferably, the pyrolysis furnace includes at least one three-valve shut-off system, which includes a furnace pyrolysis gas main valve, a coke removal bypass valve, and a furnace coke removal main valve. The furnace pyrolysis gas main valve and the coke removal bypass valve are linked by a mechanical mechanism. When the furnace pyrolysis gas main valve is opened, the coke removal bypass valve is closed. When the furnace pyrolysis gas main valve is closed, the coke removal bypass valve is opened.

[0015] Preferably, during the quench tower cut-in stage, controlling the key cut-in parameters and issuing control commands specifically includes:

[0016] The flow rate of the dilution steam in the single tube of the furnace is kept constant based on its initial flow rate, and the temperature of the ultra-high pressure steam is kept constant based on its initial temperature;

[0017] In the first stage, the furnace coking valve is fully closed at the first coking valve rate. After the furnace coking valve is fully closed, the furnace pyrolysis gas valve is fully opened at the first pyrolysis valve rate, allowing the furnace steam to be cut out of the furnace and enter the quench tower. When the negative pressure of the pyrolysis furnace drops to the first furnace negative pressure from its initial negative pressure, the negative pressure of the pyrolysis furnace is controlled to rise to the second furnace negative pressure at the first negative pressure rate from the first furnace negative pressure, and is maintained for a first set time after rising to the second furnace negative pressure. At the same time, the calorific value of the fuel gas is controlled to decrease to the first preset calorific value from its initial calorific value at the first preset calorific value rate.

[0018] In the second stage, after the negative pressure in the pyrolysis furnace is maintained at the second negative pressure for a first set time, the negative pressure in the pyrolysis furnace is controlled to rise at a second negative pressure rate to the initial negative pressure of the pyrolysis furnace.

[0019] Preferably, the first furnace negative pressure is -180 to -130 Pa, the second furnace negative pressure is -70 to -40 Pa, the first negative pressure rate is 15 to 35 Pa / min, the second negative pressure rate is 0.5 to 15 Pa / min, the first pyrolysis valve rate is 10 to 40% / min, the first coke removal valve rate is 20 to 60% / min, the first preset calorific value rate is 0.2 to 2 MW / min, the first preset calorific value is 6 to 10 MW, and the first set time is 1 to 30 min.

[0020] Preferably, the pyrolysis furnace includes at least one furnace chamber.

[0021] Preferably, the system further includes an operation navigation function module, which provides operation prompts during the quench tower entry stage based on the control instructions of the intelligent control module for the furnace steam entry into the quench tower process.

[0022] Preferably, before the first stage, the operation navigation function module prompts the user to switch the high-pressure interlock of the pyrolysis furnace to the bypass.

[0023] After the second stage, the operation navigation function module prompts the user to adjust the raw material blind plate and the quench oil blind plate to orifice plates, open the quench oil regulating valve of the oil cooler, and check the status of the cracking furnace.

[0024] Preferably, the system further includes a process key parameter monitoring and alarm module, which is used to monitor process key parameters during the quench tower stage and to issue an alarm when the process key parameters exceed a preset range.

[0025] Preferably, the key process parameters include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the calorific value of the fuel gas, the fuel gas pressure, the pyrolysis furnace furnace pressure, the pressure after the Venturi tube, the VHS steam drum level, the ultra-high pressure steam temperature, the ultra-high pressure steam pressure, and the temperature of the pyrolysis furnace cross section.

[0026] Preferably, the monitoring of key process parameters and the triggering of an alarm when the key process parameters exceed a preset range specifically includes:

[0027] An alarm is triggered when one or more of the process key parameters exceed a first preset range;

[0028] When one or more of the process key parameters exceed the second preset range, the process key parameters that exceed the second preset range will be adjusted to the first preset range according to a preset ratio based on their current values, and an alarm will be triggered.

[0029] Preferably, the upper limit of the second preset range is greater than the upper limit of the first preset range, the lower limit of the second preset range is less than the lower limit of the first preset range, and the preset ratio is ±0.1% to 10%.

[0030] Preferably, the system also includes a process alarm optimization management module, which automatically disables the cracking furnace operating instrument alarms and turns the cracking furnace operating instrument alarm activation indicator light red after entering the quench tower stage; and automatically enables the cracking furnace operating instrument alarms and turns the cracking furnace operating instrument alarm activation indicator light green after the quench tower stage is completed.

[0031] Preferably, the types of alarms on the pyrolysis furnace operating instruments include: high oxygen content alarm in the cross section flue gas, bottom fuel heat load ratio alarm, side wall fuel heat load ratio alarm, pyrolysis furnace liquid phase feed flow alarm, pyrolysis furnace gas phase feed flow alarm, quench oil flow alarm, total feed alarm, furnace tube gas feed flow alarm, furnace tube liquid feed flow alarm, gas feed pressure alarm, liquid feed pressure alarm, quench cooler outlet temperature alarm, inlet coke gas temperature adjustment alarm, pyrolysis gas temperature alarm, and Venturi differential pressure alarm.

[0032] Preferably, the system further includes a deep learning function module, which is used to learn the control advantages and disadvantages of each key parameter in the quench tower stage based on experience values ​​and big data, and to derive the optimal control values ​​of the key parameters in the quench tower stage.

[0033] To achieve the above objectives, a second aspect of this invention provides an automated method for the process of cutting steam into a quench tower in an ethylene cracking furnace. This method is implemented using the aforementioned system and includes:

[0034] A pre-entry quench tower status confirmation module is adopted to confirm the initial parameters before the cracking furnace steam enters the quench tower. When the initial parameters are within the initial range, it indicates that the quench tower can be entered. When the initial parameters are not within the initial range, an alarm is triggered.

[0035] An intelligent control module for the furnace steam cut-in quench tower process is adopted. During the cut-in quench tower stage, the key parameters of the cut-in are controlled and control commands are issued. The key parameters of the cut-in include the furnace single-pipe dilution steam flow rate, the furnace negative pressure of the pyrolysis furnace, the calorific value of the fuel gas, and the ultra-high pressure steam temperature.

[0036] A furnace steam cut-in quench tower execution module is adopted. During the cut-in quench tower stage, the cut-in quench tower is performed according to the control instructions of the intelligent control module for the furnace steam cut-in quench tower process.

[0037] Based on the above technical solution, in practical applications, by confirming the state before cutting into the quench tower, and then controlling the key parameters of cutting into the quench tower through the intelligent control module of the furnace steam cutting into the quench tower during the cutting-in stage, and by executing the corresponding operation according to the control command through the furnace steam cutting into the quench tower execution module, the stability of the system during the furnace steam cutting into the quench tower can be effectively improved, and it has the advantages of high cutting-in efficiency and high safety. Attached Figure Description

[0038] Figure 1 This is a flowchart of the automated system for the process of steam being cut into the quench tower in an ethylene cracking furnace. Detailed Implementation

[0039] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0040] The first aspect of this invention provides an automated execution system for the process of steam being cut into the quench tower in an ethylene cracking furnace, such as... Figure 1 As shown, the automated system for the process of cutting steam into the quench tower in the furnace of the ethylene cracking furnace includes:

[0041] The pre-entry status confirmation module is used to confirm the initial parameters before the furnace steam of the cracking furnace enters the quench tower. When the initial parameters are within the initial range, it indicates that the quench tower can be entered. When the initial parameters are not within the initial range, it issues an alarm.

[0042] The intelligent control module for the furnace steam cut-in to the quench tower process is used to control the key parameters of the cut-in and issue control commands during the cut-in to the quench tower stage. The key parameters of the cut-in include the furnace single-pipe dilution steam flow rate, the pyrolysis furnace negative pressure, the calorific value of the fuel gas, and the ultra-high pressure steam temperature.

[0043] The furnace steam cut-in quench tower execution module is used to cut into the quench tower according to the control instructions of the furnace steam cut-in quench tower process intelligent control module during the cut-in quench tower stage.

[0044] In this invention, the furnace steam cut-in quench tower execution module is used to cut in the quench tower stage according to the control instructions of the furnace steam cut-in quench tower process intelligent control module. Specifically, according to the control instructions, multiple key cut-in parameters are controlled to reach set values ​​in the quench tower stage, thereby realizing the cut-in quench tower.

[0045] Based on the above technical solution, in practical applications, by confirming the state before cutting into the quench tower, and then controlling the key parameters of cutting into the quench tower through the intelligent control module of the furnace steam cutting into the quench tower during the cutting-in stage, and by executing the corresponding operation according to the control command through the furnace steam cutting into the quench tower execution module, the stability of the system during the furnace steam cutting into the quench tower can be effectively improved, and it has the advantages of high cutting-in efficiency and high safety.

[0046] In a preferred embodiment of the automatic execution system for the ethylene cracking furnace steam cut-in quench tower process described in this invention, the alarm activation when the initial parameters are outside the initial range specifically includes:

[0047] When the initial parameter is not within the initial range, an alarm is triggered for one or more of the initial parameters that are not within the initial range.

[0048] In one specific implementation, the initial parameters include the single-tube dilution steam flow rate in the furnace, the outlet temperature of the pyrolysis furnace, the ultra-high pressure steam temperature, the negative pressure in the pyrolysis furnace, the injection rate of dimethyl disulfide in the single-tube furnace, the outlet pressure of the oil pump in the quench tower, the quench oil level in the quench tower, and the calorific value of the fuel gas.

[0049] In a more specific embodiment, the initial range of the dilution steam flow rate in the single-tube furnace is 3500–5500 kg / h, preferably 3800–4500 kg / h; the initial range of the pyrolysis furnace outlet temperature is 710–780°C, preferably 715–750°C; the initial range of the ultra-high pressure steam temperature is 480–525°C, preferably 505–520°C; the initial range of the negative pressure in the pyrolysis furnace is -45–-20 Pa, preferably -35–-25 Pa; the initial range of the dimethyl disulfide injection rate in the single-tube furnace is 1–20 kg / h, preferably 3–6 kg / h; the initial range of the oil pump outlet pressure in the quench tower is 1.1–2 MPa; the initial range of the quench oil level in the quench tower is 45–55%; and the initial range of the calorific value of the fuel gas is 11–13 MW. This ensures that all preparations are complete before the pyrolysis furnace steam enters the quench tower, especially that the key initial parameters are within the initial range, thus guaranteeing the accuracy and stability of the quench tower entry process.

[0050] In one specific embodiment of the automatic execution system for the process of cutting steam into the quench tower in the furnace of an ethylene cracking furnace, the cracking furnace includes at least one three-valve shut-off system. The three-valve shut-off system includes a furnace cracking gas main valve, a coke removal bypass valve, and a furnace coke removal main valve. The furnace cracking gas main valve and the coke removal bypass valve are linked by a mechanical mechanism. When the furnace cracking gas main valve is opened, the coke removal bypass valve is closed. When the furnace cracking gas main valve is closed, the coke removal bypass valve is opened.

[0051] In a more specific implementation, the step of controlling key parameters and issuing control commands during the quench tower cut-in stage specifically includes:

[0052] The flow rate of the dilution steam in the single tube of the furnace is kept constant based on its initial flow rate, and the temperature of the ultra-high pressure steam is kept constant based on its initial temperature;

[0053] In the first stage, the furnace coking valve is fully closed at the first coking valve rate. After the furnace coking valve is fully closed, the furnace pyrolysis gas valve is fully opened at the first pyrolysis valve rate, allowing the furnace steam to be cut out of the furnace and enter the quench tower. When the negative pressure of the pyrolysis furnace drops to the first furnace negative pressure from its initial negative pressure, the negative pressure of the pyrolysis furnace is controlled to rise to the second furnace negative pressure at the first negative pressure rate from the first furnace negative pressure, and is maintained for a first set time after rising to the second furnace negative pressure. At the same time, the calorific value of the fuel gas is controlled to decrease to the first preset calorific value from its initial calorific value at the first preset calorific value rate.

[0054] In the second stage, after the negative pressure in the pyrolysis furnace is maintained at the second negative pressure for a first set time, the negative pressure in the pyrolysis furnace is controlled to rise at a second negative pressure rate to the initial negative pressure of the pyrolysis furnace.

[0055] In a more specific embodiment, the first furnace negative pressure is -180 to -130 Pa, preferably -140 to -160 Pa; the second furnace negative pressure is -70 to -40 Pa, preferably -45 to -60 Pa; the first negative pressure rate is 15 to 35 Pa / min, preferably 20 to 30 Pa / min; the second negative pressure rate is 0.5 to 15 Pa / min, preferably 1 to 8 Pa / min; the first cracking valve rate is 10 to 40% / min, preferably 20 to 30% / min; the first coke removal valve rate is 20 to 60% / min, preferably 35 to 45% / min; the first preset calorific value rate is 0.2 to 2 MW / min, preferably 0.8 to 1.2 MW / min; the first preset calorific value is 6 to 10 MW; and the first set time is 1 to 30 min.

[0056] In this embodiment of the invention, by controlling the dilution steam flow rate of the single tube in the furnace, the negative pressure of the cracking furnace, the calorific value of the fuel gas, and the temperature of the ultra-high pressure steam, and making them change linearly throughout the entire quench tower initiation stage, the problem of large fluctuations in parameters such as the negative pressure of the cracking furnace caused by manual quench tower initiation based on experience is effectively solved, which leads to unplanned shutdowns of the ethylene plant. At the same time, compared with manual quench tower initiation based on experience, the efficiency of quench tower initiation and the safety of the system during the quench tower initiation process are greatly improved.

[0057] In a preferred embodiment of the automatic execution system for the process of steam cutting into the quench tower in the furnace of an ethylene cracking furnace according to the present invention, the cracking furnace includes at least one furnace chamber.

[0058] In an embodiment of the present invention, when the pyrolysis furnace is not a single furnace chamber, specifically, for example, when the pyrolysis furnace has two furnace chambers, the same operation is performed on the other furnace chamber in accordance with the first stage. Further, for example, when the pyrolysis furnace has more than two furnace chambers, the other furnace chambers are operated in the same way until all furnace chambers have been operated and the second stage is performed.

[0059] In a preferred embodiment, the automatic execution system for the process of cutting steam into the quench tower in an ethylene cracking furnace according to the present invention further includes an operation navigation function module, which is used to provide operation prompts during the cutting-in quench tower stage according to the control instructions of the intelligent control module for the process of cutting steam into the quench tower.

[0060] In one specific implementation, prior to the first stage, the operation navigation function module prompts the user to switch the high-pressure interlock of the pyrolysis furnace to the bypass.

[0061] After the second stage, the operation navigation function module prompts the user to adjust the raw material blind plate and the quench oil blind plate to orifice plates, open the quench oil regulating valve of the oil cooler, and check the status of the cracking furnace.

[0062] In this embodiment of the invention, the operation navigation function module further provides operation prompts based on the control commands of the intelligent control module for the quench tower cut-in process during the pyrolysis furnace cut-in process, which can further effectively improve system safety and cut-in efficiency. More specifically, a pyrolysis furnace status check module can also be further set up to check the status of the pyrolysis furnace after the cut-in is completed, thereby ensuring safety.

[0063] In a preferred embodiment, the automatic execution system for the process of cutting steam into the quench tower in the ethylene cracking furnace of the present invention further includes a process key parameter monitoring and alarm module, which is used to monitor the process key parameters during the quench tower cutting stage and to issue an alarm when the process key parameters exceed a preset range.

[0064] In one specific implementation, the key process parameters include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the calorific value of the fuel gas, the fuel gas pressure, the furnace pressure in the pyrolysis furnace, the pressure after the Venturi tube, the VHS steam drum level, the ultra-high pressure steam temperature, the ultra-high pressure steam pressure, and the temperature of the pyrolysis furnace cross section.

[0065] In another specific implementation, the monitoring of key process parameters and the triggering of an alarm when the key process parameters exceed a preset range specifically includes:

[0066] An alarm is triggered when one or more of the process key parameters exceed a first preset range;

[0067] When one or more of the process key parameters exceed the second preset range, the process key parameters exceeding the second preset range are adjusted to the first preset range based on their current values ​​by a preset ratio, and an alarm is triggered. The upper limit of the second preset range is greater than the upper limit of the first preset range, and the lower limit of the second preset range is less than the lower limit of the first preset range; the preset ratio is ±0.1% to 10%.

[0068] In this embodiment of the invention, taking the ultra-high pressure steam temperature among the key process parameters as an example, the first preset range is 480–525°C, and the second preset range is 470–530°C. When the key process parameter monitoring and alarm module detects that the ultra-high pressure steam temperature is 475°C, an alarm is triggered. When the key process parameter monitoring and alarm module further detects that the ultra-high pressure steam temperature is 460°C, the ultra-high pressure steam temperature is expanded to the first preset range by 0.1%–10% based on 460°C, and an alarm is triggered, thereby improving the safety of the system throughout the entire cut-in process.

[0069] Furthermore, the process key parameter monitoring and alarm module can set alarm display status according to priority, and the alarm sound and light signals should be easily distinguishable. For example, when the ultra-high pressure steam temperature exceeds the first preset range, a level one alarm is used, and when the ultra-high pressure steam temperature exceeds the second preset range, a level two alarm is used. Specifically, the level one alarm uses a yellow background with black text, flashing, and a low-frequency sound, while the level two alarm uses an orange background with black text, flashing, and a medium-frequency sound. The boundary values ​​of the first and second preset ranges should not coincide with the instrument range of the alarm device of the process key parameter monitoring and alarm module, and should be set within 10% to 90% of the maximum range of the instrument.

[0070] In a preferred embodiment, the automatic execution system for the process of cutting steam into the quench tower in the ethylene cracking furnace of the present invention further includes a process alarm optimization management module, which is used to automatically shield the cracking furnace operating instrument alarms and turn the cracking furnace operating instrument alarm activation indicator light red after entering the quench tower cutting stage; and to automatically activate the cracking furnace operating instrument alarms and turn the cracking furnace operating instrument alarm activation indicator light green after the quench tower cutting stage is completed.

[0071] In one specific implementation, the types of alarms on the pyrolysis furnace operating instruments include: high oxygen content alarm in the cross section flue gas, bottom fuel heat load ratio alarm, side wall fuel heat load ratio alarm, pyrolysis furnace liquid phase feed flow alarm, pyrolysis furnace gas phase feed flow alarm, quench oil flow alarm, total feed alarm, furnace tube gas feed flow alarm, furnace tube liquid feed flow alarm, gas feed pressure alarm, liquid feed pressure alarm, quench cooler outlet temperature alarm, inlet coke gas temperature adjustment alarm, pyrolysis gas temperature alarm, and Venturi differential pressure alarm.

[0072] In this embodiment of the invention, the alarm optimization management module for the cutting-in process allows operators to easily know whether the alarm is properly activated during actual use, thus avoiding interference from invalid alarms that could affect the efficiency of the pyrolysis furnace steam cutting into the quench tower.

[0073] In a preferred embodiment, the automatic execution system for the process of cutting steam into the quench tower in an ethylene cracking furnace according to the present invention further includes a deep learning module. This module learns the control advantages and disadvantages of each key parameter in the quench tower stage based on empirical values ​​and big data, and derives the optimal control values ​​for these key parameters. This maximizes the stability and improves efficiency of the cutting process.

[0074] A second aspect of the present invention provides an automated method for the process of cutting steam into a quench tower in an ethylene cracking furnace. This method is implemented using the aforementioned system and includes:

[0075] A pre-entry quench tower status confirmation module is adopted to confirm the initial parameters before the cracking furnace steam enters the quench tower. When the initial parameters are within the initial range, it indicates that the quench tower can be entered. When the initial parameters are not within the initial range, an alarm is triggered.

[0076] An intelligent control module for the furnace steam cut-in quench tower process is adopted. During the cut-in quench tower stage, the key parameters of the cut-in are controlled and control commands are issued. The key parameters of the cut-in include the furnace single-pipe dilution steam flow rate, the furnace negative pressure of the pyrolysis furnace, the calorific value of the fuel gas, and the ultra-high pressure steam temperature.

[0077] A furnace steam cut-in quench tower execution module is adopted. During the cut-in quench tower stage, the cut-in quench tower is performed according to the control instructions of the intelligent control module for the furnace steam cut-in quench tower process.

[0078] In this invention, by confirming the state before the furnace steam enters the quench tower, and then controlling key parameters during the furnace steam entry process using an intelligent control module, and executing corresponding operations according to control commands using a furnace steam entry execution module, the stability of the system during the furnace steam entry process can be effectively improved. This invention offers advantages of high entry efficiency and high safety.

[0079] The automatic execution system for the steam cut-in quench tower process in the ethylene cracking furnace, as described in this invention, comprises a human-machine interface and a program control system. This system achieves online control through a combination of DCS configuration and host computer server programming. To automate the process, an independent server is deployed on the industrial control network. The execution program for this process interacts with the Emerson DCS's OPC server via the OPC DA interface to obtain relevant parameter values ​​or statuses. Furthermore, to ensure the secure operation of the DCS system, an industrial-grade firewall is added between the system server and the communication interface. By configuring appropriate rules and policies, deep isolation and protection of the DCS control system are achieved, cutting off virus transmission pathways and ensuring the normal, safe, and stable operation of the plant's DCS production control system. The industrial firewall incorporates proprietary communication protocols from various mainstream automation product manufacturers, enabling seamless access to systems such as Honeywell DCS, Yokogawa DCS, and Emerson DCS, as well as servers or databases such as OPC SERVER, IP21 / PHD / PI.

[0080] The human-machine interface includes function buttons such as "Parameter Setting," "Pyrolysis Furnace Status Confirmation," "Program Run," "Run Pause," "Run Continue," "Run Stop," and "Parameter Alarm" to enable human-machine interaction. Specifically, clicking the "Parameter Setting" button allows viewing the default values ​​of each control parameter and manually setting the control thresholds and upper / lower limits of key parameters according to actual production needs. Clicking the "Pyrolysis Furnace Status Confirmation" button confirms the status before furnace steam enters the quench tower, and the interface then jumps to the furnace steam entering the quench tower operation interface; otherwise, the furnace steam... The quench tower cutting-in program cannot run; clicking the "Program Run" button will start the furnace steam quench tower cutting-in program; clicking "Pause" will stop the system from proceeding to the next step, and the control values ​​of each parameter of the furnace steam quench tower cutting-in program will remain at their current values; clicking "Continue" will allow the program to continue according to the current execution steps; manually clicking "Stop" will stop the automatic furnace steam quench tower cutting-in program of the cracking furnace and switch to manual operation; clicking the "Alarm Button" will switch the human-machine interface to the alarm interface, where you can view the system alarm status in detail, and you can also choose whether to enable the alarm shielding function during the furnace steam quench tower cutting-in process as needed.

[0081] Furthermore, the human-machine interface also includes system operation status display, system operation buttons, key parameter trend graphs, and system alarm prompts. Among these, the "Run," "Stop," "Pause," "Continue," and "Parameter Setting" function buttons on the human-machine interface can be executed by the user at any time during system operation, based on the actual operating conditions of the ethylene unit and compressor.

[0082] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.

[0083] Example 1

[0084] Based on an ethylene cracking furnace with a production capacity of 140,000 tons / year, the present invention is adopted as follows: Figure 1 The automated execution system for the process of cutting steam into the quench tower in the ethylene cracking furnace, as shown, is implemented. Specifically, the system includes:

[0085] The pre-entry status confirmation module is used to confirm the initial parameters before the furnace steam of the cracking furnace enters the quench tower. When the initial parameters are within the initial range, it indicates that the quench tower can be entered. When the initial parameters are not within the initial range, it issues an alarm.

[0086] The intelligent control module for the furnace steam cut-in to the quench tower process is used to control the key parameters of the cut-in and issue control commands during the cut-in to the quench tower stage. The key parameters of the cut-in include the furnace single-pipe dilution steam flow rate, the pyrolysis furnace negative pressure, the calorific value of the fuel gas, and the ultra-high pressure steam temperature.

[0087] The furnace steam cut-in quench tower execution module is used to cut into the quench tower according to the control instructions of the furnace steam cut-in quench tower process intelligent control module during the cut-in quench tower stage.

[0088] Specifically, the alarm being triggered when the initial parameter is not within the initial range includes:

[0089] When the initial parameters are not within the initial range, an alarm is triggered for one or more of the initial parameters that are not within the initial range. The initial parameters include the furnace single-tube dilution steam flow rate, the pyrolysis furnace outlet temperature, the ultra-high pressure steam temperature, the pyrolysis furnace negative pressure, the furnace single-tube dimethyl disulfide injection rate, the quench tower oil pump outlet pressure, the quench tower quench oil level, and the fuel gas calorific value. The furnace single-tube dilution steam flow rate is 4500 kg / h, the pyrolysis furnace outlet temperature is 720℃, the ultra-high pressure steam temperature is 510℃, the pyrolysis furnace negative pressure is -30 Pa, the furnace single-tube dimethyl disulfide injection rate is 5 kg / h, the quench tower oil pump outlet pressure is 1.3 MPa, the quench tower quench oil level is 50%, and the fuel gas calorific value is 12 MW.

[0090] The pyrolysis furnace includes at least one three-valve shut-off system, which includes a furnace pyrolysis gas main valve, a coke removal bypass valve, and a furnace coke removal main valve. The furnace pyrolysis gas main valve and the coke removal bypass valve are linked by a mechanical mechanism. When the furnace pyrolysis gas main valve is opened, the coke removal bypass valve is closed. When the furnace pyrolysis gas main valve is closed, the coke removal bypass valve is opened.

[0091] During the quench tower cut-in stage, key cut-in parameters are controlled and control commands are issued, specifically including:

[0092] The flow rate of the dilution steam in the single tube of the furnace is kept constant based on its initial flow rate, and the temperature of the ultra-high pressure steam is kept constant based on its initial temperature;

[0093] In the first stage, the furnace coking valve is fully closed at the first coking valve rate. After the furnace coking valve is fully closed, the furnace pyrolysis gas valve is fully opened at the first pyrolysis valve rate, allowing the furnace steam to be cut out of the furnace and enter the quench tower. When the negative pressure of the pyrolysis furnace drops to the first furnace negative pressure from its initial negative pressure, the negative pressure of the pyrolysis furnace is controlled to rise to the second furnace negative pressure at the first negative pressure rate from the first furnace negative pressure, and is maintained for a first set time after rising to the second furnace negative pressure. At the same time, the calorific value of the fuel gas is controlled to decrease to the first preset calorific value from its initial calorific value at the first preset calorific value rate.

[0094] In the second stage, after the negative pressure in the pyrolysis furnace is maintained at the second negative pressure for a first set time, the negative pressure in the pyrolysis furnace is controlled to rise at a second negative pressure rate to the initial negative pressure in the pyrolysis furnace.

[0095] The first furnace negative pressure is -150Pa, the second furnace negative pressure is -50Pa, the first negative pressure rate is 25Pa / min, the second negative pressure rate is 4Pa / min, the first cracking valve rate is 25% / min, the first coking valve rate is 40% / min, the first preset calorific value rate is 0.5MW / min, the first preset calorific value is 8MW, and the first set time is 5min.

[0096] In practical application, before entering the quench tower, the pre-entry status confirmation module confirms the initial parameters. When the initial parameters are within the initial range, it indicates that entry into the quench tower is possible. Next, the intelligent control module for the furnace steam entry into the quench tower controls the furnace single-pipe dilution steam flow rate to remain constant at 4500 kg / h, and the ultra-high pressure steam temperature to remain constant at 510℃. In the first stage, the furnace coking valve is fully closed at a rate of 40% / min. After the furnace coking valve is fully closed, the furnace pyrolysis gas valve is fully opened at a rate of 25% / min, allowing the furnace steam (dilution steam) to exit the furnace and enter the quench tower. The furnace negative pressure is maintained at its initial negative pressure of -30 Pa. After the pressure drops to -150 Pa in the first furnace chamber, the pressure in the pyrolysis furnace chamber is controlled to rise at a rate of 25 Pa / min to -50 Pa in the second furnace chamber, and then held at -50 Pa for 5 minutes. At the same time, the calorific value of the fuel gas is controlled to decrease at a rate of 0.5 MW / min from the initial calorific value of 12 MW to the first preset calorific value of 8 MW. In the second stage, after the pressure in the pyrolysis furnace chamber is held at -50 Pa in the second furnace chamber for 5 minutes, the pressure in the pyrolysis furnace chamber is controlled to rise at a rate of 4 Pa / min to the initial negative pressure of -30 Pa in the pyrolysis furnace chamber, and the rapid cooling is completed.

[0097] Testing revealed that the automatic execution system for the process of cutting steam from the ethylene cracking furnace into the quench tower, as described in this invention, effectively confirms the state before cutting into the quench tower through a pre-cut-in-the-quench-tower status confirmation module. This ensures that the furnace steam can be cut into the quench tower normally and guarantees the accuracy of subsequent cut-in. Furthermore, the intelligent control module for the process of cutting steam into the quench tower controls the key parameters, preventing drastic fluctuations in these parameters that could lead to system instability. The system boasts advantages such as high cut-in efficiency, minimal fluctuations in key parameters, high stability, and high safety.

[0098] Example 2

[0099] The pyrolysis furnace is implemented in accordance with Example 1, except that it includes at least two furnace chambers.

[0100] Testing revealed that the automatic execution system for the process of cutting steam from the ethylene cracking furnace into the quench tower, as described in this invention, effectively confirms the state before cutting into the quench tower through a pre-cut-in-the-quench-tower status confirmation module. This ensures that the furnace steam can be cut into the quench tower normally and guarantees the accuracy of subsequent cut-in. Furthermore, the intelligent control module for the process of cutting steam into the quench tower controls the key parameters, preventing drastic fluctuations in these parameters that could lead to system instability. The system boasts advantages such as high cut-in efficiency, minimal fluctuations in key parameters, high stability, and high safety.

[0101] Example 3

[0102] The implementation is based on Example 2, except that the first pyrolysis valve rate is 20% / min, the first coking valve rate is 35% / min, the first preset calorific value rate is 0.4MW / min, and the first preset calorific value is 7MW.

[0103] Testing revealed that the automatic execution system for the process of cutting steam from the ethylene cracking furnace into the quench tower, as described in this invention, effectively confirms the state before cutting into the quench tower through a pre-cut-in-the-quench-tower status confirmation module. This ensures that the furnace steam can be cut into the quench tower normally and guarantees the accuracy of subsequent cut-in. Furthermore, the intelligent control module for the process of cutting steam into the quench tower controls the key parameters, preventing drastic fluctuations in these parameters that could lead to system instability. The system boasts advantages such as high cut-in efficiency, minimal fluctuations in key parameters, high stability, and high safety.

[0104] Example 4

[0105] The implementation is based on Example 2, except that the first pyrolysis valve rate is 20% / min, the first coking valve rate is 45% / min, the first preset calorific value rate is 0.6MW / min, and the first preset calorific value is 6MW.

[0106] Testing revealed that the automatic execution system for the process of cutting steam from the ethylene cracking furnace into the quench tower, as described in this invention, effectively confirms the state before cutting into the quench tower through a pre-cut-in-the-quench-tower status confirmation module. This ensures that the furnace steam can be cut into the quench tower normally and guarantees the accuracy of subsequent cut-in. Furthermore, the intelligent control module for the process of cutting steam into the quench tower controls the key parameters, preventing drastic fluctuations in these parameters that could lead to system instability. The system boasts advantages such as high cut-in efficiency, minimal fluctuations in key parameters, high stability, and high safety.

[0107] Example 5

[0108] The implementation is based on Example 2, except that the first pyrolysis valve rate is 30% / min, the first coking valve rate is 45% / min, the first preset calorific value rate is 0.6MW / min, and the first preset calorific value is 7MW.

[0109] Testing revealed that the automatic execution system for the process of cutting steam from the ethylene cracking furnace into the quench tower, as described in this invention, effectively confirms the state before cutting into the quench tower through a pre-cut-in-the-quench-tower status confirmation module. This ensures that the furnace steam can be cut into the quench tower normally and guarantees the accuracy of subsequent cut-in. Furthermore, the intelligent control module for the process of cutting steam into the quench tower controls the key parameters, preventing drastic fluctuations in these parameters that could lead to system instability. The system boasts advantages such as high cut-in efficiency, minimal fluctuations in key parameters, high stability, and high safety.

[0110] Example 6

[0111] Referring to Embodiment 2, the difference is that the system also includes an operation navigation function module, which is used to provide operation prompts during the quench tower initiation stage according to the control instructions of the intelligent control module for the furnace steam cutting into the quench tower process; before the first stage, the operation navigation function module prompts to switch the high-pressure interlock of the pyrolysis furnace to the bypass.

[0112] After the second stage, the operation navigation function module prompts the user to adjust the raw material blind plate and the quench oil blind plate to orifice plates, open the quench oil regulating valve of the oil cooler, and check the status of the cracking furnace.

[0113] Tests showed that, compared to Example 2, it can further improve cutting efficiency and safety during the cutting process.

[0114] Example 7

[0115] The system is implemented in accordance with Embodiment 6, but with the difference that it also includes a process key parameter monitoring and alarm module, which is used to monitor the process key parameters during the quench tower cutting-in stage and to issue an alarm when the process key parameters exceed the preset range. The process key parameters include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the calorific value of the fuel gas, the fuel gas pressure, the pyrolysis furnace furnace pressure, the pressure after the Venturi tube, the VHS steam drum liquid level, the ultra-high pressure steam temperature, the ultra-high pressure steam pressure, and the temperature of the pyrolysis furnace cross section.

[0116] Testing showed that the safety during the cutting process can be further improved compared to Example 6.

[0117] Example 8

[0118] Referring to Embodiment 7, the difference is that the monitoring of key process parameters and the triggering of an alarm when the key process parameters exceed a preset range specifically include:

[0119] An alarm is triggered when one or more of the process key parameters exceed a first preset range;

[0120] When one or more of the process key parameters exceed the second preset range, the process key parameters that exceed the second preset range are adjusted to the first preset range based on their current values ​​by a preset ratio, and an alarm is triggered; the upper limit of the second preset range is greater than the upper limit of the first preset range, and the lower limit of the second preset range is less than the lower limit of the first preset range, and the preset ratio is ±0.1% to 10%.

[0121] Testing showed that the safety during the cutting process can be further improved compared to Example 7.

[0122] Example 9

[0123] Referring to Embodiment 8, the system also includes a process alarm optimization management module, which automatically disables the cracking furnace operating instrument alarms and turns the cracking furnace operating instrument alarm activation indicator light red after entering the quench tower stage; and automatically activates the cracking furnace operating instrument alarms and turns the cracking furnace operating instrument alarm activation indicator light green after the quench tower stage is completed. The types of cracking furnace operating instrument alarms include high oxygen content alarm in cross-section flue gas, bottom fuel heat load ratio alarm, sidewall fuel heat load ratio alarm, cracking furnace liquid phase feed flow alarm, cracking furnace gas phase feed flow alarm, quench oil flow alarm, total feed alarm, furnace tube gas feedstock flow alarm, furnace tube liquid feedstock flow alarm, gas feedstock pressure alarm, liquid feedstock pressure alarm, quencher outlet temperature alarm, inlet coke gas temperature adjustment alarm, cracked gas temperature alarm, and Venturi differential pressure alarm.

[0124] Tests showed that the cutting efficiency can be further improved compared to Example 8.

[0125] Example 10

[0126] The system is implemented in accordance with Embodiment 9, but with the difference that it also includes a deep learning function module, which is used to learn the control advantages and disadvantages of each of the key parameters of the quench tower stage based on experience values ​​and big data, and to derive the optimal control values ​​of the key parameters of the quench tower stage.

[0127] Tests showed that, compared to Example 9, it can further improve the cutting efficiency, as well as the stability and safety during the cutting process.

[0128] The automatic execution system and method for the process of cutting steam into the quench tower in an ethylene cracking furnace provided by this invention confirms the state before cutting into the quench tower, and then controls the key parameters of the cutting-in process through the intelligent control module of the furnace steam cutting into the quench tower during the cutting-in stage. The furnace steam cutting into the quench tower execution module executes the corresponding operations according to the control instructions, which can effectively improve the stability of the system during the process of cutting steam into the quench tower and has the advantages of high cutting-in efficiency and high safety.

[0129] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. An automated system for the process of steam being cut into a quench tower in an ethylene cracking furnace, characterized in that, The system includes: The pre-entry status confirmation module is used to confirm the initial parameters before the furnace steam of the cracking furnace enters the quench tower. When the initial parameters are within the initial range, it indicates that the quench tower can be entered. When the initial parameters are not within the initial range, it issues an alarm. The intelligent control module for the furnace steam cut-in to the quench tower process is used to control the key parameters of the cut-in and issue control commands during the cut-in to the quench tower stage. The key parameters of the cut-in include the furnace single-pipe dilution steam flow rate, the pyrolysis furnace negative pressure, the calorific value of the fuel gas, and the ultra-high pressure steam temperature. The furnace steam cut-in quench tower execution module is used to cut into the quench tower according to the control instructions of the furnace steam cut-in quench tower process intelligent control module during the cut-in quench tower stage. The initial parameters include the dilution steam flow rate of the single tube in the furnace, the outlet temperature of the pyrolysis furnace, the ultra-high pressure steam temperature, the negative pressure in the pyrolysis furnace, the injection amount of dimethyl disulfide in the single tube in the furnace, the oil pump outlet pressure of the quench tower, the quench oil level in the quench tower, and the calorific value of the fuel gas. The pyrolysis furnace includes at least one three-valve shut-off system, which includes a furnace pyrolysis gas main valve, a coke removal bypass valve, and a furnace coke removal main valve. The furnace pyrolysis gas main valve and the coke removal bypass valve are linked by a mechanical mechanism. When the furnace pyrolysis gas main valve is opened, the coke removal bypass valve is closed. When the furnace pyrolysis gas main valve is closed, the coke removal bypass valve is opened. During the quench tower cut-in stage, key cut-in parameters are controlled and control commands are issued, specifically including: The flow rate of the dilution steam in the single tube of the furnace is kept constant based on its initial flow rate, and the temperature of the ultra-high pressure steam is kept constant based on its initial temperature; In the first stage, the furnace coking valve is fully closed at the first coking valve rate. After the furnace coking valve is fully closed, the furnace pyrolysis gas valve is fully opened at the first pyrolysis valve rate, allowing the furnace steam to be cut out of the furnace and enter the quench tower. When the negative pressure of the pyrolysis furnace drops to the first furnace negative pressure from its initial negative pressure, the negative pressure of the pyrolysis furnace is controlled to rise to the second furnace negative pressure at the first negative pressure rate from the first furnace negative pressure, and is maintained for a first set time after rising to the second furnace negative pressure. At the same time, the calorific value of the fuel gas is controlled to decrease to the first preset calorific value from its initial calorific value at the first preset calorific value rate. In the second stage, after the negative pressure in the pyrolysis furnace is maintained at the second negative pressure for a first set time, the negative pressure in the pyrolysis furnace is controlled to rise at a second negative pressure rate to the initial negative pressure of the pyrolysis furnace.

2. The system according to claim 1, characterized in that, The alarm is triggered when the initial parameter is not within the initial range, specifically including: When the initial parameter is not within the initial range, an alarm is triggered for one or more of the initial parameters that are not within the initial range.

3. The system according to claim 1, characterized in that, The initial range of the dilution steam flow rate in the single tube of the furnace is 3500~5500 kg / h, the initial range of the outlet temperature of the pyrolysis furnace is 710~780℃, the initial range of the ultra-high pressure steam temperature is 480~525℃, the initial range of the negative pressure in the furnace chamber of the pyrolysis furnace is -45~-20 Pa, the initial range of the dimethyl disulfide injection rate in the single tube of the furnace is 1~20 kg / h, the initial range of the oil pump outlet pressure of the quench tower is 1.1~2 MPa, the initial range of the quench oil level in the quench tower is 45~55%, and the initial range of the calorific value of the fuel gas is 11~13 MW.

4. The system according to claim 1, characterized in that, The first furnace negative pressure is -180~-130Pa, the second furnace negative pressure is -70~-40Pa, the first negative pressure rate is 15~35Pa / min, the second negative pressure rate is 0.5~15Pa / min, the first cracking valve rate is 10~40% / min, the first coke removal valve rate is 20~60% / min, the first preset calorific value rate is 0.2~2MW / min, the first preset calorific value is 6~10MW, and the first set time is 1~30min.

5. The system according to claim 1, characterized in that, The pyrolysis furnace includes at least one furnace chamber.

6. The system according to claim 1, characterized in that, The system also includes an operation navigation function module, which provides operation prompts during the quench tower initiation stage based on the control instructions of the intelligent control module for the furnace steam initiation into the quench tower process.

7. The system according to claim 6, characterized in that, Prior to the first stage, the operation navigation function module prompts the user to switch the high-pressure interlock of the pyrolysis furnace to the bypass. After the second stage, the operation navigation function module prompts the user to adjust the raw material blind plate and the quench oil blind plate to orifice plates, open the quench oil regulating valve of the oil cooler, and check the status of the cracking furnace.

8. The system according to claim 1, characterized in that, The system also includes a process key parameter monitoring and alarm module, which is used to monitor process key parameters during the quench tower stage and to issue an alarm when the process key parameters exceed the preset range.

9. The system according to claim 8, characterized in that, The key parameters of the process include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the calorific value of the fuel gas, the fuel gas pressure, the furnace pressure of the pyrolysis furnace, the pressure after the Venturi tube, the VHS steam drum level, the ultra-high pressure steam temperature, the ultra-high pressure steam pressure, and the temperature of the pyrolysis furnace cross section.

10. The system according to claim 8, characterized in that, The monitoring of key process parameters and the issuance of an alarm when the key process parameters exceed a preset range specifically include: An alarm is triggered when one or more of the process key parameters exceed a first preset range; When one or more of the process key parameters exceed the second preset range, the process key parameters that exceed the second preset range will be adjusted to the first preset range according to a preset ratio based on their current values, and an alarm will be triggered.

11. The system according to claim 10, characterized in that, The upper limit of the second preset range is greater than the upper limit of the first preset range, the lower limit of the second preset range is less than the lower limit of the first preset range, and the preset ratio is ±0.1%~10%.

12. The system according to claim 1, characterized in that, The system also includes a process alarm optimization management module, which automatically disables the cracking furnace operating instrument alarms and turns the cracking furnace operating instrument alarm activation indicator light red after entering the quench tower cutting stage. After the quench tower phase is completed, the cracking furnace operation instrument alarm is automatically activated, and the cracking furnace operation instrument alarm activation indicator light turns green.

13. The system according to claim 12, characterized in that, The types of alarms on the pyrolysis furnace operating instruments include: high oxygen content alarm in the cross section flue gas, bottom fuel heat load ratio alarm, side wall fuel heat load ratio alarm, pyrolysis furnace liquid phase feed flow alarm, pyrolysis furnace gas phase feed flow alarm, quench oil flow alarm, total feed alarm, furnace tube gas feed flow alarm, furnace tube liquid feed flow alarm, gas feed pressure alarm, liquid feed pressure alarm, quench cooler outlet temperature alarm, inlet coke gas temperature adjustment alarm, pyrolysis gas temperature alarm, and Venturi differential pressure alarm.

14. The system according to claim 1, characterized in that, The system also includes a deep learning module, which is used to learn the advantages and disadvantages of the control of each key parameter in the quench tower stage based on experience values ​​and big data, and to derive the optimal control values ​​of the key parameters in the quench tower stage.

15. An automated method for the process of cutting steam into a quench tower in an ethylene cracking furnace, characterized in that, This method is implemented using the system according to any one of claims 1-14, and the method includes: A pre-entry quench tower status confirmation module is adopted to confirm the initial parameters before the cracking furnace steam enters the quench tower. When the initial parameters are within the initial range, it indicates that the quench tower can be entered. When the initial parameters are not within the initial range, an alarm is triggered. An intelligent control module for the furnace steam cut-in quench tower process is adopted. During the cut-in quench tower stage, the key parameters of the cut-in are controlled and control commands are issued. The key parameters of the cut-in include the furnace single-pipe dilution steam flow rate, the furnace negative pressure of the pyrolysis furnace, the calorific value of the fuel gas, and the ultra-high pressure steam temperature. A furnace steam cut-in quench tower execution module is adopted. During the cut-in quench tower stage, the cut-in quench tower is performed according to the control instructions of the intelligent control module for the furnace steam cut-in quench tower process.

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