Automatic execution system and method for ethylene cracking furnace cut-off quench tower process

Abstract

This invention relates to the field of petrochemical technology, specifically to an automated execution system and method for the quench tower cut-out process of an ethylene cracking furnace. The system includes a pre-quench tower cut-out state confirmation module, used to confirm initial parameters before the quench tower cut-out process and, when the initial parameters are within an initial range, indicate that the quench tower cut-out can proceed; a quench tower cut-out process intelligent control module, used to control key cut-out parameters and issue control commands during the quench tower cut-out stage; and a quench tower cut-out execution module, used to execute the quench tower cut-out according to the control commands from the intelligent control module. By using this system to confirm the state before the quench tower cut-out and to control key cut-out parameters during the quench tower cut-out stage, the system stability during the quench tower cut-out process of the cracking furnace can be effectively improved, offering advantages of high cut-out 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 cutting out the 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. Tubular cracking furnaces, used for hydrocarbon cracking, are the core unit in ethylene production, determining the overall production capacity, stable operation, and total 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 necessary to ensure normal production. When cleaning or repairing the furnace, the pyrolysis gas pipeline and the pyrolysis gas main pipe of the pyrolysis furnace must be completely cut off. That is, the pyrolysis furnace needs to be cut out of the quench tower to prevent pyrolysis gas backflow during furnace cleaning or repair and to prevent air from entering the pyrolysis gas main pipe or even the quench tower during cleaning.

[0003] Currently, the furnace cutting process of most ethylene cracking furnaces in China is still manually controlled. Manually cutting the cracking furnace out of 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 responsibility of the operator. During the furnace cutting process, it is difficult to accurately control key parameters such as the negative pressure in the cracking furnace and the outlet temperature of the cracking furnace, which can easily cause large fluctuations in key parameters, resulting in system instability and posing significant safety hazards.

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

[0005] This invention addresses the problem that in the prior art, the process of cutting out the quench tower in 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 and the outlet temperature during the process, resulting in low cutting efficiency, poor system stability and safety. The invention provides an automated execution system and method for the process of cutting out the quench tower in an ethylene cracking furnace.

[0006] To achieve the above objectives, the first aspect of this invention provides an automated execution system for the quench tower cut-off process of an ethylene cracking furnace, the system comprising:

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

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

[0009] The quench tower cut-out execution module is used to cut out the quench tower according to the control instructions of the quench tower cut-out process intelligent control module during the quench tower cut-out 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 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 amount of dimethyl disulfide in the single-tube furnace, 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 720–750°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, and the initial range of the calorific value of the fuel gas is 7–9 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-out stage, controlling the key cut-out parameters and issuing control commands specifically includes:

[0016] The flow rate of dilution steam in the single tube of the furnace is controlled to remain constant based on its initial flow rate.

[0017] In the first stage, the negative pressure in the pyrolysis furnace is controlled to decrease to a first negative pressure at a first negative pressure rate, based on its initial negative pressure.

[0018] In the second stage, when the negative pressure in the pyrolysis furnace chamber drops to the first negative pressure in the furnace chamber, the furnace pyrolysis gas valve is controlled to be fully closed at the first pyrolysis valve rate. When the negative pressure in the pyrolysis furnace chamber rises to the second negative pressure in the furnace chamber based on the first negative pressure in the furnace chamber, the furnace coke removal valve is controlled to be fully opened at the first coke removal valve rate, so that dilution steam enters the furnace chamber of the pyrolysis furnace. At the same time, the calorific value of the fuel gas is controlled to rise to the first preset calorific value based on its initial calorific value at the first preset calorific value rate.

[0019] In the third stage, after the negative pressure of the pyrolysis furnace is maintained at the second negative pressure for a first set time, the negative pressure of the pyrolysis furnace is controlled to rise at a second negative pressure rate to the initial negative pressure of the pyrolysis furnace based on the second negative pressure.

[0020] In the fourth stage, after the negative pressure in the pyrolysis furnace rises to the initial negative pressure, the outlet temperature of the pyrolysis furnace is controlled to be maintained at its initial temperature for a second set time. Then, the outlet temperature of the pyrolysis furnace is controlled to rise to a first set temperature at a first heating rate based on its initial temperature, and is maintained at the first set temperature for a third set time. At the same time, after the ultra-high pressure steam temperature is controlled to be maintained at its initial temperature for a fourth set time, the ultra-high pressure steam temperature is controlled to rise to a first set steam temperature at the first heating rate based on its initial temperature.

[0021] 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 cracking 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 10 to 15 MW, the first set time is 1 to 10 min, the second set time is 5 to 30 min, the third set time is 30 to 120 min, the fourth set time is 10 to 60 min, the first set temperature is 740-800℃, the first set steam temperature is 500 to 525℃, and the first heating rate is 0.2 to 10℃ / min.

[0022] Preferably, the pyrolysis furnace includes at least one furnace chamber.

[0023] Preferably, the system further includes an operation navigation function module, which provides operation prompts during the quench tower cutting-out stage based on the control instructions of the intelligent control module for the quench tower cutting-out process.

[0024] Preferably, before the first stage, the operation navigation function module prompts the user to disengage the high-pressure interlock of the pyrolysis furnace.

[0025] After the fourth stage, the operation navigation function module prompts the user to close the dimethyl disulfide root valve, stop the dimethyl disulfide injection, and check the status of the cracking furnace.

[0026] 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 cutting stage and to issue an alarm when the process key parameters exceed a preset range.

[0027] 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.

[0028] Preferably, the monitoring of key process parameters and the triggering of an alarm when the key process parameters exceed a preset range specifically includes:

[0029] An alarm is triggered when one or more of the process key parameters exceed a first preset range;

[0030] 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.

[0031] 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%.

[0032] Preferably, the system also includes a cut-out 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 cut-out 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 cut-out quench tower stage is completed.

[0033] 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.

[0034] Preferably, the system further includes a deep learning module, which is used to learn the control advantages and disadvantages of each of the key cutting parameters in the quench tower cutting stage based on experience values ​​and big data, and to derive the optimal control values ​​of the key cutting parameters in the quench tower cutting stage.

[0035] To achieve the above objectives, a second aspect of the present invention provides an automated method for the process of cutting off the quench tower in an ethylene cracking furnace. This method is implemented using the aforementioned system and includes:

[0036] A pre-cut-out quench tower status confirmation module is adopted to confirm the initial parameters before the quench tower is cut out of the cracking furnace. When the initial parameters are within the initial range, it indicates that the quench tower can be cut out. When the initial parameters are not within the initial range, an alarm is triggered.

[0037] An intelligent control module for the cut-out quench tower process is adopted to control the key parameters of the cut-out process and issue control commands during the cut-out quench tower stage. The key parameters of the cut-out process include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the negative pressure in the pyrolysis furnace, the calorific value of the fuel gas, and the ultra-high pressure steam temperature.

[0038] The quench tower cut-out execution module is adopted. During the quench tower cut-out stage, the quench tower is cut out according to the control instructions of the intelligent control module for the quench tower cut-out process.

[0039] Based on the above technical solution, in practical applications, by confirming the state before cutting out the quench tower, and then controlling the key cutting parameters during the cutting out quench tower stage through the intelligent control module of the cutting out quench tower process, and by executing the corresponding operation according to the control command through the cutting out quench tower execution module, the stability of the system during the cutting out quench tower process can be effectively improved, and it has the advantages of high cutting out efficiency and high safety. Attached Figure Description

[0040] Figure 1 This is a flowchart of the automated system for the process of cutting out the quench tower in an ethylene cracking furnace. Detailed Implementation

[0041] 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.

[0042] The first aspect of this invention provides an automated execution system for the quench tower cutting process of an ethylene cracking furnace, such as... Figure 1 As shown, the automated execution system for the quench tower cut-off process of the ethylene cracking furnace includes:

[0043] The pre-cut-out quench tower status confirmation module is used to confirm the initial parameters before the quench tower is cut out of the cracking furnace. When the initial parameters are within the initial range, it indicates that the quench tower can be cut out. When the initial parameters are not within the initial range, it issues an alarm.

[0044] The intelligent control module for the cut-out quench tower process is used to control the key parameters of the cut-out process and issue control commands during the cut-out quench tower stage. The key parameters of the cut-out process include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the negative pressure in the pyrolysis furnace, the calorific value of the fuel gas, and the ultra-high pressure steam temperature.

[0045] The quench tower cut-out execution module is used to cut out the quench tower according to the control instructions of the quench tower cut-out process intelligent control module during the quench tower cut-out stage.

[0046] In this invention, the cut-out quench tower execution module is used to cut out the quench tower according to the control instructions of the cut-out quench tower process intelligent control module during the cut-out quench tower stage. Specifically, it controls various key cut-out parameters to reach set values ​​during the cut-out quench tower stage according to the control instructions, thereby realizing the cut-out of the quench tower.

[0047] Based on the above technical solution, in practical applications, by confirming the state before cutting out the quench tower, and then controlling the key cutting parameters during the cutting out quench tower stage through the intelligent control module of the cutting out quench tower process, and by executing the corresponding operation according to the control command through the cutting out quench tower execution module, the stability of the system during the cutting out quench tower process can be effectively improved, and it has the advantages of high cutting out efficiency and high safety.

[0048] In a preferred embodiment of the automatic execution system for the ethylene cracking furnace cut-off quench tower process described in this invention, the alarm activation when the initial parameters are outside the initial range specifically includes:

[0049] 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.

[0050] In one specific embodiment, the initial parameters include the single-tube dilution steam flow rate in the furnace, the pyrolysis furnace outlet temperature, the ultra-high pressure steam temperature, the pyrolysis furnace negative pressure, the single-tube dimethyl disulfide injection rate in the furnace, and the calorific value of the fuel gas. In a more specific embodiment, the initial range of the single-tube dilution steam flow rate in the furnace is 3500–5500 kg / h, preferably 3800–4500 kg / h; the initial range of the pyrolysis furnace outlet temperature is 720–750°C, preferably 720–735°C; the initial range of the ultra-high pressure steam temperature is 480–525°C, preferably 480–500°C; the initial range of the pyrolysis furnace negative pressure is -45 to -20 Pa, preferably -35 to -25 Pa; the initial range of the single-tube dimethyl disulfide injection rate in the furnace is 1–20 kg / h, preferably 3–6 kg / h; and the initial range of the calorific value of the fuel gas is 7–9 MW. This ensures that all preparations are complete before the pyrolysis furnace cuts off the quench tower, especially that key initial parameters are within their initial ranges, thus guaranteeing the safety of the quench tower cutting-off process and the efficiency of subsequent cutting-off. Specifically, ensuring the ultra-high pressure steam temperature is within the set range before cutting off effectively prevents a large amount of dilution steam from entering the pyrolysis furnace during the cutting-off process, which could cause negative pressure in the furnace and excessively high ultra-high pressure steam temperature, triggering a chain-reaction trip.

[0051] The automatic execution system for the ethylene cracking furnace cut-off quench tower process of the present invention, in one specific embodiment, includes a cracking furnace comprising 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 open, the coke removal bypass valve is closed; when the furnace cracking gas main valve is closed, the coke removal bypass valve is opened. In a more specific embodiment, during the cut-off quench tower stage, the key cut-off parameters are controlled and control commands are issued, specifically including:

[0052] The flow rate of dilution steam in the single tube of the furnace is controlled to remain constant based on its initial flow rate.

[0053] In the first stage, the negative pressure in the pyrolysis furnace is controlled to decrease to a first negative pressure at a first negative pressure rate, based on its initial negative pressure.

[0054] In the second stage, when the negative pressure in the pyrolysis furnace chamber drops to the first negative pressure in the furnace chamber, the furnace pyrolysis gas valve is controlled to be fully closed at the first pyrolysis valve rate. When the negative pressure in the pyrolysis furnace chamber rises to the second negative pressure in the furnace chamber based on the first negative pressure in the furnace chamber, the furnace coke removal valve is controlled to be fully opened at the first coke removal valve rate, so that dilution steam enters the furnace chamber of the pyrolysis furnace. At the same time, the calorific value of the fuel gas is controlled to rise to the first preset calorific value based on its initial calorific value at the first preset calorific value rate.

[0055] In the third stage, after the negative pressure of the pyrolysis furnace is maintained at the second negative pressure for a first set time, the negative pressure of the pyrolysis furnace is controlled to rise at a second negative pressure rate to the initial negative pressure of the pyrolysis furnace based on the second negative pressure.

[0056] In the fourth stage, after the negative pressure in the pyrolysis furnace rises to the initial negative pressure, the outlet temperature of the pyrolysis furnace is controlled to be maintained at its initial temperature for a second set time. Then, the outlet temperature of the pyrolysis furnace is controlled to rise to a first set temperature at a first heating rate based on its initial temperature, and is maintained at the first set temperature for a third set time. At the same time, after the ultra-high pressure steam temperature is controlled to be maintained at its initial temperature for a fourth set time, the ultra-high pressure steam temperature is controlled to rise to a first set steam temperature at the first heating rate based on its initial temperature.

[0057] In a further, more specific embodiment, the first furnace negative pressure is -180 to -130 Pa, preferably -160 to -140 Pa; the second furnace negative pressure is -70 to -40 Pa, preferably -60 to -45 Pa; the first negative pressure rate is 15 to 35 Pa / min, preferably 22 to 28 Pa / min; the second negative pressure rate is 0.5 to 15 Pa / min, preferably 3 to 8 Pa / min; the first pyrolysis valve rate is 10 to 40% / min, preferably 20 to 30% / min; and the first coke removal valve rate is 20 to 60% / min, preferably 35 to 45% / min. The first preset calorific value rate is 0.2–2 MW / min, preferably 0.3–0.8 MW / min; the first preset calorific value is 10–15 MW; the first set time is 1–10 min; the second set time is 5–30 min; the third set time is 30–120 min; the fourth set time is 10–60 min; the first set temperature is 740–800℃, preferably 750–780℃; the first set steam temperature is 500–525℃, preferably 505–515℃; and the first heating rate is 0.2–10℃ / min, preferably 0.5–3℃ / min.

[0058] In this embodiment of the invention, by controlling the pyrolysis furnace outlet temperature, the single-pipe dilution steam flow rate in the furnace, the furnace negative pressure, the fuel gas calorific value, and the ultra-high pressure steam temperature in stages, and ensuring that these parameters change linearly throughout the quench tower cut-out stage, the problem of significant fluctuations in parameters such as the pyrolysis furnace outlet temperature and furnace negative pressure, leading to unplanned shutdowns of the ethylene plant, caused by manually cutting out the quench tower based on experience, is effectively solved. Furthermore, compared to manually cutting out the quench tower based on experience, this significantly improves the efficiency of the quench tower cut-out and the safety of the system during the process. The dilution steam entering the furnace is ultimately released into the atmosphere from the furnace top.

[0059] In a preferred embodiment of the automatic execution system for the quench tower cutting process of the ethylene cracking furnace described in this invention, the cracking furnace includes at least one furnace chamber.

[0060] 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 as in the second 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 third stage is performed.

[0061] In a preferred embodiment, the automatic execution system for the ethylene cracking furnace cut-out quench tower process of the present invention further includes an operation navigation function module, which is used to provide operation prompts during the cut-out quench tower stage according to the control instructions of the intelligent control module for the cut-out quench tower process.

[0062] In one specific implementation, prior to the first stage, the operation navigation function module prompts the user to disengage the high-pressure interlock of the pyrolysis furnace lining.

[0063] After the fourth stage, the operation navigation function module prompts the user to close the dimethyl disulfide root valve, stop the dimethyl disulfide injection, and check the status of the cracking furnace.

[0064] In this embodiment of the invention, the operation navigation function module further provides operation prompts based on the control instructions of the intelligent control module for the cutting-out quench tower during the pyrolysis furnace cutting-out process, which can further effectively improve system safety and cutting-out efficiency during the cutting-out process.

[0065] In a preferred embodiment, the automatic execution system for the ethylene cracking furnace cut-out quench tower process 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 cut-out quench tower stage and to issue an alarm when the process key parameters exceed a preset range.

[0066] 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.

[0067] 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:

[0068] An alarm is triggered when one or more of the process key parameters exceed a first preset range;

[0069] 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%.

[0070] 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 480-500℃, and the second preset range is 470-510℃. When the key process parameter monitoring and alarm module detects that the ultra-high pressure steam temperature is 475℃, an alarm is triggered. When the key process parameter monitoring and alarm module further detects that the ultra-high pressure steam temperature is 460℃, the ultra-high pressure steam temperature is expanded to the first preset range by 0.1%-10% based on 460℃, and an alarm is triggered, thereby improving the safety of the system throughout the entire cutting process.

[0071] 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.

[0072] In a preferred embodiment, the automatic execution system for the ethylene cracking furnace cut-out quench tower process of the present invention further includes a cut-out 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 cut-out quench tower 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 cut-out quench tower stage is completed.

[0073] 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.

[0074] In this embodiment of the invention, the alarm optimization management module for the cutting 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 cutting quench tower process.

[0075] In a preferred embodiment, the automated execution system for the ethylene cracking furnace cut-out quench tower process of the present invention further includes a deep learning module. This module learns the control advantages and disadvantages of each key cut-out parameter in the quench tower stage based on empirical values ​​and big data, and derives the optimal control values ​​for the key cut-out parameters in the quench tower stage. This maximizes the stability and improves the efficiency of the cut-out process.

[0076] A second aspect of the present invention provides an automated method for the process of cutting off the quench tower in an ethylene cracking furnace, the method being implemented using the aforementioned system, the method comprising:

[0077] A pre-cut-out quench tower status confirmation module is adopted to confirm the initial parameters before the quench tower is cut out of the cracking furnace. When the initial parameters are within the initial range, it indicates that the quench tower can be cut out. When the initial parameters are not within the initial range, an alarm is triggered.

[0078] An intelligent control module for the cut-out quench tower process is adopted to control the key parameters of the cut-out process and issue control commands during the cut-out quench tower stage. The key parameters of the cut-out process include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the negative pressure in the pyrolysis furnace, the calorific value of the fuel gas, and the ultra-high pressure steam temperature.

[0079] The quench tower cut-out execution module is adopted. During the quench tower cut-out stage, the quench tower is cut out according to the control instructions of the intelligent control module for the quench tower cut-out process.

[0080] In this invention, by confirming the state before cutting out the quench tower, and then controlling the key cutting parameters during the cutting out quench tower stage through the intelligent control module of the cutting out quench tower process, and by executing the corresponding operation according to the control command through the cutting out quench tower execution module, the stability of the system during the cutting out quench tower process can be effectively improved, and it has the advantages of high cutting out efficiency and high safety.

[0081] The automatic execution system for the ethylene cracking furnace quench tower cutting process described in this invention, in one specific embodiment, comprises a human-machine interface and a program control system, thereby achieving online control through a combination of field distributed control system (DCS) configuration and upper-level server programming. To achieve automatic execution of the ethylene cracking furnace quench tower cutting process, an independent server needs to be deployed on the industrial control network. The ethylene cracking furnace quench tower cutting process execution program interacts with data through the OPC DA interface of the Emerson DCS OPC server to obtain the values ​​or status of relevant parameters. To ensure the safe operation of the DCS system, an industrial-grade firewall is added between the system server and the communication interface. By configuring corresponding rules and policies, deep isolation and protection of the DCS control system is achieved, cutting off virus propagation paths 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 OPC SERVER, IP21 / PHD / PI servers or databases.

[0082] 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 completes the status confirmation before cutting off the quench tower, and the interface then redirects to the quench tower operation interface. Otherwise, the quench tower cutting-off program cannot run; click the "Run Program" button to start the quench tower cutting-off program; click "Pause" to stop the system from proceeding to the next step, and keep the control values ​​of each parameter of the quench tower cutting-off program at their current values; click "Continue" to continue the program according to the current execution steps; manually click "Stop" to stop the automatic quench tower cutting-off program of the cracking furnace and switch to manual operation; click the "Alarm Button" to 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 quench tower cutting-off process as needed.

[0083] 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 plant.

[0084] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.

[0085] Example 1

[0086] 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 ethylene cracking furnace cut-off quench tower process shown herein specifically includes:

[0087] The pre-cut-out quench tower status confirmation module is used to confirm the initial parameters before the quench tower is cut out of the cracking furnace. When the initial parameters are within the initial range, it indicates that the quench tower can be cut out. When the initial parameters are not within the initial range, it issues an alarm.

[0088] The intelligent control module for the cut-out quench tower process is used to control the key parameters of the cut-out process and issue control commands during the cut-out quench tower stage. The key parameters of the cut-out process include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the negative pressure in the pyrolysis furnace, the calorific value of the fuel gas, and the ultra-high pressure steam temperature.

[0089] The quench tower cut-out execution module is used to cut out the quench tower according to the control instructions of the quench tower cut-out process intelligent control module during the quench tower cut-out stage.

[0090] Specifically, the alarm being triggered when the initial parameter is not within the initial range includes:

[0091] 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, 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 480℃, the pyrolysis furnace negative pressure is -30 Pa, the furnace single-tube dimethyl disulfide injection rate is 5 kg / h, and the fuel gas calorific value is 8 MW.

[0092] 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.

[0093] During the quench tower cut-out stage, key cut-out parameters are controlled and control commands are issued, specifically including:

[0094] The flow rate of dilution steam in the single tube of the furnace is controlled to remain constant based on its initial flow rate.

[0095] In the first stage, the negative pressure in the pyrolysis furnace is controlled to decrease to a first negative pressure at a first negative pressure rate, based on its initial negative pressure.

[0096] In the second stage, when the negative pressure in the pyrolysis furnace chamber drops to the first negative pressure in the furnace chamber, the furnace pyrolysis gas valve is controlled to be fully closed at the first pyrolysis valve rate. When the negative pressure in the pyrolysis furnace chamber rises to the second negative pressure in the furnace chamber based on the first negative pressure in the furnace chamber, the furnace coke removal valve is controlled to be fully opened at the first coke removal valve rate, so that dilution steam enters the furnace chamber of the pyrolysis furnace. At the same time, the calorific value of the fuel gas is controlled to rise to the first preset calorific value based on its initial calorific value at the first preset calorific value rate.

[0097] In the third stage, after the negative pressure of the pyrolysis furnace is maintained at the second negative pressure for a first set time, the negative pressure of the pyrolysis furnace is controlled to rise at a second negative pressure rate to the initial negative pressure of the pyrolysis furnace based on the second negative pressure.

[0098] In the fourth stage, after the negative pressure in the pyrolysis furnace rises to the initial negative pressure, the outlet temperature of the pyrolysis furnace is controlled to be maintained at its initial temperature for a second set time. Then, the outlet temperature of the pyrolysis furnace is controlled to rise to a first set temperature at a first heating rate based on its initial temperature, and is maintained at the first set temperature for a third set time. At the same time, after the ultra-high pressure steam temperature is controlled to be maintained at its initial temperature for a fourth set time, the ultra-high pressure steam temperature is controlled to rise to a first set steam temperature at the first heating rate based on its initial temperature.

[0099] The first furnace negative pressure is -150 Pa, the second furnace negative pressure is -50 Pa, the first negative pressure rate is 25 Pa / min, the second negative pressure rate is 4 Pa / min, the first cracking valve rate is 25% / min, the first coking valve rate is 40% / min, the first preset calorific value rate is 0.5 MW / min, the first preset calorific value is 12 MW, the first set time is 2 min, the second set time is 10 min, the third set time is 60 min, the fourth set time is 20 min, the first set temperature is 760℃, the first set steam temperature is 510℃, and the first heating rate is 1℃ / min.

[0100] In practical application, before cutting off the quench tower, the pre-cut-off quench status confirmation module confirms the initial parameters. When the initial parameters are within the initial range, it indicates that the quench tower can be cut off. Then, the intelligent control module for the quench tower cutting-off process controls the single-pipe dilution steam flow rate in the furnace to remain constant at 4500 kg / h. In the first stage, the negative pressure in the pyrolysis furnace is controlled to decrease from -30 Pa to -150 Pa at a rate of 25 Pa / min. In the second stage, after the negative pressure in the pyrolysis furnace decreases to -150 Pa, the furnace pyrolysis gas valve is fully closed at a rate of 25% / min. When the negative pressure in the pyrolysis furnace rises from -150 Pa to -50 Pa, the furnace coke removal valve is fully opened at a rate of 40% / min, allowing dilution steam to enter the pyrolysis furnace. Simultaneously, during this process, the system controls... The calorific value of the fuel gas is increased from 8MW to 12MW at a rate of 0.5MW / min. In the third stage, the negative pressure of the pyrolysis furnace is maintained at -50Pa for 2 minutes, and then increased to -30Pa at a rate of 4Pa / min. In the fourth stage, when the negative pressure of the pyrolysis furnace rises to -30Pa, the outlet temperature of the pyrolysis furnace is maintained at 720℃ for 10 minutes, and then increased to 760℃ at a rate of 1℃ / min, and maintained at 760℃ for 60 minutes. At the same time, the ultra-high pressure steam temperature is maintained at 480℃ for 20 minutes, and then increased to 520℃ at a rate of 1℃ / min, thus completing the rapid cooling process.

[0101] Testing revealed that the automatic execution system for the ethylene cracking furnace quench tower cutting process described in this invention, in practical applications, confirms the state before cutting the quench tower through the pre-cutting quench state confirmation module. This ensures that the cracking furnace can normally cut the quench tower and guarantees the accuracy of subsequent cutting. Furthermore, the intelligent control module for the quench tower cutting process controls the key cutting parameters, preventing drastic fluctuations in these parameters that could cause system instability. The system boasts advantages such as high cutting efficiency, minimal fluctuations in key cutting parameters, high stability, and high safety.

[0102] Example 2

[0103] The pyrolysis furnace is implemented in accordance with Example 1, except that it includes at least two furnace chambers.

[0104] Testing revealed that the automatic execution system for the ethylene cracking furnace quench tower cutting process described in this invention, in practical applications, confirms the state before cutting the quench tower through the pre-cutting quench state confirmation module. This ensures that the cracking furnace can normally cut the quench tower and guarantees the accuracy of subsequent cutting. Furthermore, the intelligent control module for the quench tower cutting process controls the key cutting parameters, preventing drastic fluctuations in these parameters that could cause system instability. The system boasts advantages such as high cutting efficiency, minimal fluctuations in key cutting parameters, high stability, and high safety.

[0105] Example 3

[0106] 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 10MW.

[0107] Testing revealed that the automatic execution system for the ethylene cracking furnace quench tower cutting process described in this invention, in practical applications, confirms the state before cutting the quench tower through the pre-cutting quench state confirmation module. This ensures that the cracking furnace can normally cut the quench tower and guarantees the accuracy of subsequent cutting. Furthermore, the intelligent control module for the quench tower cutting process controls the key cutting parameters, preventing drastic fluctuations in these parameters that could cause system instability. The system boasts advantages such as high cutting efficiency, minimal fluctuations in key cutting parameters, high stability, and high safety.

[0108] Example 4

[0109] The implementation is based on Example 2, except that the first pyrolysis valve rate is 30% / min, the first coking valve rate is 35% / min, the first preset calorific value rate is 0.6MW / min, and the first preset calorific value is 13MW.

[0110] Testing revealed that the automatic execution system for the ethylene cracking furnace quench tower cutting process described in this invention, in practical applications, confirms the state before cutting the quench tower through the pre-cutting quench state confirmation module. This ensures that the cracking furnace can normally cut the quench tower and guarantees the accuracy of subsequent cutting. Furthermore, the intelligent control module for the quench tower cutting process controls the key cutting parameters, preventing drastic fluctuations in these parameters that could cause system instability. The system boasts advantages such as high cutting efficiency, minimal fluctuations in key cutting parameters, high stability, and high safety.

[0111] Example 5

[0112] 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 15MW.

[0113] Testing revealed that the automatic execution system for the ethylene cracking furnace quench tower cutting process described in this invention, in practical applications, confirms the state before cutting the quench tower through the pre-cutting quench state confirmation module. This ensures that the cracking furnace can normally cut the quench tower and guarantees the accuracy of subsequent cutting. Furthermore, the intelligent control module for the quench tower cutting process controls the key cutting parameters, preventing drastic fluctuations in these parameters that could cause system instability. The system boasts advantages such as high cutting efficiency, minimal fluctuations in key cutting parameters, high stability, and high safety.

[0114] Example 6

[0115] Referring to Embodiment 2, the system also includes an operation navigation function module, which provides operation prompts during the cut-out quench tower stage according to the control instructions of the intelligent control module for the cut-out quench tower process. Before the first stage, the operation navigation function module prompts the user to disengage the high-pressure interlock of the cracking furnace. After the fourth stage, the operation navigation function module prompts the user to close the dimethyl disulfide root valve, stop the dimethyl disulfide injection, and check the status of the cracking furnace.

[0116] Tests showed that, compared to Example 2, it can further improve cutting efficiency and safety during the cutting process.

[0117] Example 7

[0118] 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-out 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 level, the ultra-high pressure steam temperature, the ultra-high pressure steam pressure, and the temperature of the pyrolysis furnace cross section.

[0119] Testing showed that the safety of the cutting process can be further improved compared to Example 6.

[0120] Example 8

[0121] 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:

[0122] An alarm is triggered when one or more of the process key parameters exceed a first preset range;

[0123] 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%.

[0124] Testing showed that the safety of the cutting process can be further improved compared to Example 7.

[0125] Example 9

[0126] Referring to Embodiment 8, the system also includes a cut-out 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 cut-out 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 cut-out 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, quench cooler outlet temperature alarm, inlet coke gas temperature adjustment alarm, cracked gas temperature alarm, and Venturi differential pressure alarm.

[0127] Tests showed that the cutting efficiency can be further improved compared to Example 8.

[0128] Example 10

[0129] 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 the key cutting parameters in the quench tower cutting stage based on experience values ​​and big data, and to derive the optimal control values ​​of the key cutting parameters in the quench tower cutting stage.

[0130] Tests showed that, compared to Example 9, the cutting efficiency, as well as the stability and safety during the cutting process, can be further improved.

[0131] The automatic execution system and method for the ethylene cracking furnace cut-out quench tower process provided by the present invention confirms the state before the cut-out quench tower, and then controls the key parameters of the cut-out quench tower during the cut-out quench tower stage through the intelligent control module of the cut-out quench tower process. The cut-out quench tower execution module executes the corresponding operation according to the control command, which can effectively improve the stability of the system during the cut-out quench tower process and has the advantages of high cut-out efficiency and high safety.

[0132] 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 automatic execution system for an ethylene cracking furnace cut-out quench tower process, characterized by, The system includes: The pre-cut-out quench tower status confirmation module is used to confirm the initial parameters before the quench tower is cut out of the cracking furnace. When the initial parameters are within the initial range, it indicates that the quench tower can be cut out. When the initial parameters are not within the initial range, it issues an alarm. The intelligent control module for the cut-out quench tower process is used to control the key parameters of the cut-out process and issue control commands during the cut-out quench tower stage. The key parameters of the cut-out process include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the negative pressure in the pyrolysis furnace, the calorific value of the fuel gas, and the ultra-high pressure steam temperature. The quench tower cut-out execution module is used to cut out the quench tower according to the control instructions of the quench tower cut-out process intelligent control module during the quench tower cut-out stage. 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 amount of dimethyl disulfide in the single-tube furnace, 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-out stage, key cut-out parameters are controlled and control commands are issued, specifically including: The flow rate of dilution steam in the single tube of the furnace is controlled to remain constant based on its initial flow rate. In the first stage, the negative pressure in the pyrolysis furnace is controlled to decrease to a first negative pressure at a first negative pressure rate based on its initial negative pressure. In the second stage, when the negative pressure in the pyrolysis furnace chamber drops to the first negative pressure in the furnace chamber, the furnace pyrolysis gas valve is controlled to be fully closed at the first pyrolysis valve rate. When the negative pressure in the pyrolysis furnace chamber rises to the second negative pressure in the furnace chamber based on the first negative pressure in the furnace chamber, the furnace coke removal valve is controlled to be fully opened at the first coke removal valve rate, so that dilution steam enters the furnace chamber of the pyrolysis furnace. At the same time, the calorific value of the fuel gas is controlled to rise to the first preset calorific value based on its initial calorific value at the first preset calorific value rate. In the third stage, after the negative pressure of the pyrolysis furnace is maintained at the second negative pressure for a first set time, the negative pressure of the pyrolysis furnace is controlled to rise at a second negative pressure rate to the initial negative pressure of the pyrolysis furnace based on the second negative pressure. In the fourth stage, after the negative pressure in the pyrolysis furnace rises to the initial negative pressure, the outlet temperature of the pyrolysis furnace is controlled to be maintained at its initial temperature for a second set time. Then, the outlet temperature of the pyrolysis furnace is controlled to rise to a first set temperature at a first heating rate based on its initial temperature, and is maintained at the first set temperature for a third set time. At the same time, after the ultra-high pressure steam temperature is controlled to be maintained at its initial temperature for a fourth set time, the ultra-high pressure steam temperature is controlled to rise to a first set steam temperature at the first heating rate based on its initial temperature.

2. The system of claim 1, wherein, 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 of claim 1, wherein, 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 720~750℃, the initial range of the ultra-high pressure steam temperature is 480~525℃, the initial range of the negative pressure in 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, and the initial range of the calorific value of the fuel gas is 7~9 MW.

4. The system of claim 1, wherein, 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 10~15MW, the first set time is 1~10min, the second set time is 5~30min, the third set time is 30~120min, the fourth set time is 10~60min, the first set temperature is 740-800℃, the first set steam temperature is 500~525℃, and the first heating rate is 0.2~10℃ / min.

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

6. The system of claim 1, wherein, The system also includes an operation navigation module, which provides operation prompts during the quench tower cutting-out stage based on the control instructions from the intelligent control module for the quench tower cutting-out process.

7. The system of claim 6, wherein, Prior to the first stage, the operation navigation function module prompted the user to disengage the high-pressure interlock of the pyrolysis furnace chamber. After the fourth stage, the operation navigation function module prompts the user to close the dimethyl disulfide root valve, stop the dimethyl disulfide injection, 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 cutting stage and to issue an alarm when the process key parameters exceed the preset range.

9. The system of claim 8, wherein, 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 of claim 8, wherein, 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 of claim 10, wherein, 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 of claim 1, wherein, The system also includes a cut-out process alarm optimization management module, which automatically blocks the cracking furnace operating instrument alarms and turns the cracking furnace operating instrument alarm activation indicator light red after entering the cut-out quench tower stage; After the quench tower is cut off, the cracking furnace operation instrument alarm is automatically activated, and the cracking furnace operation instrument alarm activation indicator light turns green.

13. The system of claim 12, wherein, 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 of claim 1, wherein, The system also includes a deep learning module, which is used to learn the control advantages and disadvantages of the key cutting parameters in the quench tower cutting stage based on experience values ​​and big data, and to derive the optimal control values ​​of the key cutting parameters in the quench tower cutting stage.

15. An automated method for the process of cutting off the 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-cut-out quench tower status confirmation module is adopted to confirm the initial parameters before the quench tower is cut out of the cracking furnace. When the initial parameters are within the initial range, it indicates that the quench tower can be cut out. When the initial parameters are not within the initial range, an alarm is triggered. An intelligent control module for the cut-out quench tower process is adopted to control the key parameters of the cut-out process and issue control commands during the cut-out quench tower stage. The key parameters of the cut-out process include the pyrolysis furnace outlet temperature, the single-tube dilution steam flow rate in the furnace, the negative pressure in the pyrolysis furnace, the calorific value of the fuel gas, and the ultra-high pressure steam temperature. The quench tower cut-out execution module is adopted. During the quench tower cut-out stage, the quench tower is cut out according to the control instructions of the intelligent control module for the quench tower cut-out process.

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