CN113122305B - Automatic feeding method of ethylene cracking furnace, storage medium and electronic equipment - Google Patents
Automatic feeding method of ethylene cracking furnace, storage medium and electronic equipment Download PDFInfo
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- CN113122305B CN113122305B CN202110426472.3A CN202110426472A CN113122305B CN 113122305 B CN113122305 B CN 113122305B CN 202110426472 A CN202110426472 A CN 202110426472A CN 113122305 B CN113122305 B CN 113122305B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
- C10G9/14—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
- C10G9/18—Apparatus
- C10G9/20—Tube furnaces
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C4/00—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
- C07C4/02—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by cracking a single hydrocarbon or a mixture of individually defined hydrocarbons or a normally gaseous hydrocarbon fraction
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
- C10G9/14—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils in pipes or coils with or without auxiliary means, e.g. digesters, soaking drums, expansion means
- C10G9/18—Apparatus
- C10G9/20—Tube furnaces
- C10G9/206—Tube furnaces controlling or regulating the tube furnaces
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G9/00—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils
- C10G9/34—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by direct contact with inert preheated fluids, e.g. with molten metals or salts
- C10G9/36—Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils by direct contact with inert preheated fluids, e.g. with molten metals or salts with heated gases or vapours
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/20—C2-C4 olefins
Abstract
The application discloses an automatic feeding method of an ethylene cracking furnace, a storage medium and electronic equipment, wherein the automatic feeding method of the ethylene cracking furnace comprises the steps of: controlling the state of each working system of the cracking furnace to be a preparation state before feeding; adjusting the temperature of the hearth outlet to be the temperature of the hearth outlet before feeding, and confirming that the hearth valve interlocking state is in the hearth valve interlocking state before feeding; a material feeding step: adjusting the total feed flow of a hearth feed adjusting valve to a first feed flow, and putting the hearth feed adjusting valve into cascade; and then, controlling a hearth feeding adjusting valve to carry out staged feeding according to cascade. The utility model designs automatic control logic and has realized that the pyrolysis furnace throws the automatically regulated and the automatic judgement of material in-process, confirms the state of each operating system of pyrolysis furnace before throwing the material, and automatic adjustment furnace exit temperature confirms furnace valve interlocking state, throws the material in-process according to predetermined judgement logic, adopts to throw the material stage by stage, and the automatic adjustment feed regulating valve realizes that the automation of pyrolysis furnace throws the material.
Description
Technical Field
The application relates to the technical field of automatic control of ethylene cracking furnaces, in particular to an automatic feeding method of an ethylene cracking furnace, a storage medium and electronic equipment.
Background
Ethylene is cracked and produced by raw materials such as naphtha, propane and the like, along with the law of domestic ethylene cracking technology, the cracking furnace is gradually enlarged, and the production operation is greatly changed relative to the operation of the traditional cracking furnace. Wherein, the feeding process of the cracking furnace needs to strictly control the matching of the feeding quantity and the heat load and the follow-up regulation of a corresponding boiler water system, a corresponding flue gas system and the like. At present, the feeding operation is manually adjusted by workers, the requirements on operation technology are strict, the risk is high, and the demand on the operators is large; the one-time feeding operation time is long, an adjusting valve needs to be frequently operated by an operator, the key parameters are continuously concerned, the operation fault tolerance rate is low, and the operator is easy to fatigue; meanwhile, different personnel have inconsistent experience on key parameters, and the equipment body caused by operation has large impact, so that the furnace hearth temperature of the cracking furnace is easy to stir, and the cracking furnace is shut down unplanned. Therefore, it is desirable to provide an automatic feeding method, a storage medium and an electronic apparatus for an ethylene cracking furnace, which have little dependency on human experience and can safely and stably perform feeding work.
Disclosure of Invention
The utility model aims to overcome the defect that the cracking furnace in the prior art depends on manual operation during feeding, and provides an automatic feeding method, a storage medium and an electronic device for an ethylene cracking furnace, which have small dependence on the experience of personnel and can safely and stably complete feeding work.
The technical scheme of the application provides an automatic feeding method of an ethylene cracking furnace, which comprises the following steps: responding to a feeding start instruction, and executing the following steps:
the method comprises the following steps of:
controlling the state of each working system of the cracking furnace to be a preparation state before feeding;
adjusting the temperature of the hearth outlet to be the temperature of the hearth outlet before feeding, and confirming that the hearth valve interlocking state is in the hearth valve interlocking state before feeding;
a material feeding step:
adjusting the total feed flow of a hearth feed adjusting valve to a first feed flow, and putting the hearth feed adjusting valve into cascade;
after the first state of the hearth is confirmed, adjusting the total feed flow of the hearth feed adjusting valve to a second feed flow;
after confirming the second state of the hearth, adjusting the total feed flow of the hearth feed adjusting valve to a third feed flow, and simultaneously setting a hearth purging steam adjusting valve to be manual and adjusting to a zero position;
and after the third state of the hearth is confirmed, adjusting the total feed flow of the hearth feed adjusting valve to a fourth feed flow, and simultaneously reducing the hearth dilution steam flow to a preset dilution steam flow.
Further, the method also comprises the following steps:
putting a hearth dilution steam controller into cascade connection, and controlling the flow of dilution steam in proportion;
adjusting the flow of the vulcanizing agent to a preset flow of the vulcanizing agent;
and adjusting the temperature of the outlet of the hearth according to the cracking depth. Further, adjusting the furnace outlet temperature is the furnace outlet temperature before feeding, and specifically comprises:
setting the target temperature of the hearth outlet temperature controller as the temperature of the hearth outlet before feeding, wherein the heating rate is a preset heating rate;
and waiting for a preset temperature rise time period until the temperature of the hearth outlet is the temperature of the hearth outlet before feeding.
Further, after adjusting the total flow of feed of furnace feeding governing valve to first feed flow, will furnace feeding governing valve puts into service the cascade, specifically includes:
controlling the opening of a hearth feeding regulating valve to increase a preset opening, and waiting for a preset time period;
if the opening degree of the hearth feeding regulating valve reaches the preset maximum opening degree, or
The total flow rate of the feeding materials reaches the first feeding flow rate
And after the hearth feeding total amount controller is set to be in an automatic state, the hearth feeding adjusting valve is put into cascade connection, otherwise, the hearth feeding adjusting valve is returned to control the opening of the hearth feeding adjusting valve to increase the preset opening, and the step of waiting for the preset time period is carried out.
Further, after adjusting the total flow of feed of furnace feed governing valve to first feed flow, will furnace feed governing valve commits the cascade, still includes:
if the opening of the hearth feeding adjusting valve is smaller than the preset maximum opening after a first feeding time period, and the total feeding flow is smaller than the first feeding flow, an alarm is given; and/or
And if the opening of the hearth feeding regulating valve is controlled to increase by a preset opening and the step execution times of waiting for a preset time period exceed the preset maximum times, giving an alarm.
Further, adjusting the total feed flow of the furnace feed adjusting valve to a second feed flow specifically includes:
setting a target flow value of a hearth feeding total amount controller as a second feeding flow, and automatically adjusting the opening of a hearth feeding adjusting valve by the hearth feeding total amount controller;
if the total feeding flow is less than the second feeding flow after the second feeding time period, an alarm is given;
the adjusting of the total feed flow of the hearth feed adjusting valve to a third feed flow specifically comprises:
setting a target flow value of a hearth feeding total amount controller as a third feeding flow, and automatically adjusting the opening of a hearth feeding adjusting valve by the hearth feeding total amount controller;
if the total feed flow is less than the third feed flow after a third dosing period of time, an alarm is issued;
the adjustment furnace feed governing valve's total flow of feeding to fourth feed flow specifically includes:
setting a target flow value of a hearth feeding total amount controller as a fourth feeding flow, and automatically adjusting the opening of a hearth feeding adjusting valve by the hearth feeding total amount controller;
and if the total feeding flow is less than the fourth feeding flow after the fourth feeding time period, giving an alarm.
Further, after the first state of the hearth is confirmed, the second state is confirmed, and the third state of the hearth is confirmed, stage state monitoring is further included;
the phased status monitoring, comprising:
if the furnace oxygen content is within the preset charging furnace oxygen content range, and
the drum liquid level is within a preset feed drum liquid level range, an
The furnace outlet temperature is within a preset range of the furnace outlet temperature of the fed material, and
the temperature of the ultrahigh pressure steam is within the preset feeding ultrahigh pressure steam temperature range,
the next step is performed.
Further, still include:
responding to a feeding starting instruction, and displaying real-time execution steps on a human-computer interaction interface, wherein the real-time execution steps comprise parameter confirmation and state confirmation;
in response to the feeding pause instruction, pausing execution of feeding operation until receiving a feeding continuation instruction, and continuing execution of feeding operation;
and during the feeding operation pause, if a parameter modification instruction is received, modifying the corresponding parameter according to the parameter modification instruction.
The technical scheme of the application also provides a storage medium, wherein the storage medium stores computer instructions, and when the computer instructions are executed by a computer, the storage medium is used for executing all the steps of the automatic feeding method of the ethylene cracking furnace.
The technical scheme of this application still provides an electronic equipment, includes:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein, the first and the second end of the pipe are connected with each other,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform all of the steps of the previously described automatic ethylene-cracking furnace charging method.
After adopting above-mentioned technical scheme, have following beneficial effect:
the utility model designs automatic control logic and has realized that the pyrolysis furnace throws the automatically regulated and the automatic judgement of material in-process, confirms the state of each operating system of pyrolysis furnace before throwing the material, and automatic adjustment furnace exit temperature confirms furnace valve interlocking state, throws the material in-process according to predetermined judgement logic, adopts to throw the material stage by stage, and the automatic adjustment feed regulating valve realizes that the automation of pyrolysis furnace throws the material.
Drawings
The disclosure of the present application will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present application. In the figure:
FIG. 1 is a flow chart of an automatic feeding method of an ethylene cracking furnace in one embodiment of the present application;
fig. 2 is a flowchart executed after step S106 in fig. 1;
FIG. 3 is a detailed flowchart of step S102 in FIG. 1;
FIG. 4 is a detailed flowchart of step S103 in FIG. 1;
FIG. 5 is a detailed flowchart of step S104 in FIG. 1;
FIG. 6 is a detailed flowchart of step S105 in FIG. 1;
FIG. 7 is a detailed flowchart of step S106 in FIG. 1;
FIG. 8 is a flow diagram of an ethylene cracking furnace auto-feed method performed in synchronization with FIG. 1;
FIG. 9 is a display interface when step S101 of FIG. 1 is performed;
fig. 10 is a hardware configuration diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are further described below with reference to the accompanying drawings.
It is easily understood that according to the technical solutions of the present application, those skilled in the art can substitute various structures and implementations without changing the spirit of the present application. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present application, and should not be construed as limiting or restricting the technical solutions of the present application in their entirety.
The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Throughout the description of the present application, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The foregoing is to be understood as belonging to the specific meanings in the present application as appropriate to the person of ordinary skill in the art.
The automatic feeding method of the ethylene cracking furnace in the embodiment of the application, as shown in fig. 1, includes: responding to a feeding start instruction, and executing the following steps:
step S101: controlling the state of each working system of the cracking furnace to be a preparation state before feeding;
step S102: adjusting the temperature of the hearth outlet to be the temperature of the hearth outlet before feeding, and confirming that the hearth valve interlocking state is in the hearth valve interlocking state before feeding;
step S103: adjusting the total feed flow of a hearth feed adjusting valve to a first feed flow, and putting the hearth feed adjusting valve into cascade;
step S104: after the first state of the hearth is confirmed, adjusting the total feed flow of the hearth feed adjusting valve to a second feed flow;
step S105: after confirming the second state of the hearth, adjusting the total feed flow of the hearth feed adjusting valve to a third feed flow, and simultaneously setting a hearth purging steam adjusting valve to be manual and adjusting to a zero position;
step S106: and after the third state of the hearth is confirmed, adjusting the total feed flow of the hearth feed adjusting valve to a fourth feed flow, and simultaneously reducing the hearth dilution steam flow to a preset dilution steam flow.
Wherein steps S101-S102 are pre-feeding steps, and steps S103-S106 are feeding steps.
Particularly, including boiler water supply system, raw materials system, fuel gas system, dilution steam system and furnace in the ethylene cracking furnace, valve state and data parameter in each system of ethylene cracking furnace according to the collection are adjusted each valve through the controller that corresponds.
In step S101, include
(1) Confirming that the state of a boiler water supply system is a preparation state before feeding, specifically comprising the following steps:
confirming that a boiler drum liquid level regulating valve controller is in a cascade state;
the temperature controller of the TLX quenching heat exchanger is in an 'automatic' state;
the liquid level override controller is in an 'automatic' state;
the flow control of the TLX quenching heat exchanger is in a cascade state;
the ultrahigh pressure steam temperature controller is in an automatic state;
the measured value of the ultrahigh pressure steam temperature is between 501 ℃ and 529 ℃;
the temperature-reducing water flow controller is in a cascade state;
the steam drum liquid level is in an automatic state;
the measured value of the liquid level of the steam drum is within the range of 50-70%.
(2) Confirming that the state of the raw material system is a preparation state before feeding, specifically comprising the following steps:
confirming that the raw material unit propane main pipe pressure controller is in an 'automatic' state;
the liquid level controller of the propane feeding tank and the liquid level of the steam side of the propane vaporizer are in an 'automatic' state;
the total feed rate controller of the hearth hydrocarbon is in a manual state;
the hearth feeding regulating valve controller is in a manual state, and the valve position is 0%.
(3) Confirming that the state of the fuel gas system is a preparation state before feeding, specifically comprising:
confirming that the pressure controller of the fuel gas main pipe is in an 'automatic' state;
the temperature of a fuel gas main pipe at the outlet of the fuel gas superheater is in an 'automatic' state;
the liquid level at the bottom of the fuel gas-liquid separation tank, the liquid level of the demister and the liquid level at the steam side of the main pipe superheater are in an automatic state;
the temperature of the outlet of the hearth is in an automatic state, and the temperature deviation controller of the outlet of the hearth is in a manual state;
the fuel gas flow manual selector switch is in a flow mode;
the primary fuel gas calculator is in a cascade state;
the secondary fuel gas calculator is in a cascade state;
the fuel gas flow controller is in a cascade state;
the fuel gas heat value selection switch is in a heat value state;
the hot value controller is in a "cascade" state.
(4) Confirming that the state of the dilution steam system is a preparation state before feeding, specifically comprising the following steps:
the pressure of the dilution steam main pipe is in an automatic state;
the dilution steam controller is in an 'automatic' state, and the flow set value is 5.25 t/h;
the purging steam regulating valve controller is in an 'automatic' state, and the flow set value is 1 t/h;
the crossover temperature is in "automatic" state and the measured temperature is in the range of (540-750 ℃).
(5) Confirm that the furnace state is for throwing the material preparation state, specifically have:
the furnace negative pressure controller is in an 'automatic' state, and the pressure value is between-80 PaG and-20 PaG;
the oxygen content controller is in an automatic state, and the oxygen content is between 3 and 14 percent;
the cracking furnace NOx control system is in a cascade state.
In response to a feeding start instruction input by a user, the system executes step S101 to initialize the state of the cracking furnace, and ensures that each controller is in an automatic control state of 'automatic' or 'cascade' in a range set by each parameter related before feeding so as to ensure the smooth operation of subsequent feeding.
Preferably, in the process of confirming the parameters and the system state, the execution steps are displayed in the human-computer interaction device in real time, when any parameter or state does not meet the corresponding condition, the system tries to automatically adjust the parameter or state, and if the corresponding condition is not met after the longest regulation time period, an alarm is given to remind a worker of manual adjustment.
After the state of each working system of the cracking furnace is confirmed, the hearth outlet temperature (COT) is automatically adjusted to reach the preset hearth outlet temperature before feeding, whether the hearth valve interlocking state is in the preset hearth valve interlocking state before feeding is confirmed, and the feeding process of the steps S103-S106 can be smoothly carried out.
The steps S103 to S106 are divided into four stages for feeding, and as an example, the first feed flow rate, the second feed flow rate, the third feed flow rate, and the fourth feed flow rate are set to 20%, 40%, 60%, and 100%, respectively. The opening of the hearth feeding adjusting valve is automatically adjusted through the hearth feeding total amount controller, the feeding flow is controlled, and when the feeding flow reaches each stage, the feeding flow is continuously increased after the state confirmation is carried out. As an example, confirming the first state of the hearth, confirming the second state of the hearth and confirming the third state of the hearth are performed by popping up confirmation windows on a human-computer interaction device, and after the confirmation of workers, performing subsequent steps to further increase the feeding flow.
Specifically, in step S103, hydrocarbon feed is introduced as gently as possible at the initial feeding stage, so as to avoid rapid changes in the furnace outlet temperature and ensure normal and stable operation of the cracking furnace. After the first stage feeding is completed, the cracking furnace system tends to be stable, the hearth feeding adjusting valve head is used for cascade connection, and the subsequent step is used for feeding in a cascade mode. In step S105, when the total feed flow reaches the third feed flow, the purge steam may be completely closed, and at this time, the furnace purge trim adjustment valve is set to be manual and adjusted to a zero position. In step S106, the total feed flow reaches the fourth feed flow, which is about to complete the feeding operation, and at this time, the hearth steam flow is reduced to the preset dilution steam flow, and the hearth temperature is raised.
The automatic feeding method of the ethylene cracking furnace in the embodiment of the application is used for initializing the cracking furnace in response to a feeding starting instruction, automatically feeding materials after state and parameter confirmation, and ensuring smooth and stable feeding by adopting staged feeding, and the whole process does not need workers to manually monitor various parameters and frequently operate a valve, so that the automation of feeding is realized.
Further, the automatic feeding method of the ethylene cracking furnace further includes a post-feeding step, as shown in fig. 2, after the step S106, the method further includes:
step S107: putting a hearth dilution steam controller into cascade connection, and controlling the flow of dilution steam in proportion;
step S108: adjusting the flow of the vulcanizing agent to a preset flow of the vulcanizing agent;
step S109: and adjusting the temperature of the hearth outlet according to the cracking depth.
Specifically, after the feed is 100%, that is, after the feed is completed, the furnace dilution steam controller is put into cascade and controlled according to the ratio of the dilution steam to the hydrocarbon feed to obtain an appropriate dilution ratio. Meanwhile, the automatic state of the furnace outlet temperature deviation controller is put into use, the deviation set value is set to be 0%, the flow of the vulcanizing agent is adjusted to be 5kg/h at the speed of 1kg/h, then the set temperature of the furnace outlet temperature controller is set according to the cracking depth after 20-40 minutes, and the temperature rise rate can be set to be 5 ℃/hr. And during the waiting period, workers can check the furnace tube and the burner of the cracking furnace, and the feeding process is ended until the outlet temperature of the hearth and the flow of the vulcanizing agent reach set values.
In the embodiment of the application, after the feeding is carried out to 100%, the flow of the diluted steam and the flow of the vulcanizing agent are automatically controlled, the cracking furnace is regulated to a stable state, and then the feeding process is finished, so that the smooth proceeding of the subsequent cracking process is ensured.
Further, as shown in fig. 3, in the step S102, adjusting the furnace exit temperature to be the furnace exit temperature before charging includes:
step S121: setting the target temperature of the hearth outlet temperature controller as the temperature of the hearth outlet before feeding, wherein the heating rate is a preset heating rate;
step S122: and waiting for a preset temperature rise time period until the temperature of the hearth outlet is the temperature of the hearth outlet before feeding.
Specifically, the furnace outlet temperature controller is used for controlling the furnace outlet temperature, and can control the furnace outlet temperature to rise to the set furnace outlet target temperature according to the set temperature rise rate. As an example, the outlet temperature of the charging front hearth is set to 815 ℃, the preset temperature rise rate is set to 5 ℃/h, the preset temperature rise time period can be set to 10 minutes, after the temperature controller at the outlet of the hearth is set to be completed for 10 minutes, if the outlet temperature of the hearth reaches the outlet temperature of the charging front hearth, the subsequent steps are executed, otherwise, the target temperature and the temperature rise rate of the outlet of the hearth of the temperature controller at the outlet of the hearth are set again, and the target temperature and the temperature rise rate of the outlet of the hearth are detected again after waiting for 10 minutes.
Preferably, the longest temperature rise time can be set, and if the furnace outlet temperature still does not reach the furnace outlet temperature before feeding after the longest temperature rise time since the furnace outlet temperature controller is set for the first time, an alarm is given to remind a worker to check whether the cracking furnace is in fault, and the feeding process can be suspended if necessary.
According to the embodiment of the application, the outlet temperature of the hearth is controlled by the hearth outlet temperature controller to reach the outlet temperature of the hearth before feeding, and the temperature of the hearth before feeding is guaranteed to meet the feeding requirement.
Further, as shown in fig. 4, in step S103, after adjusting the total feed flow of the furnace feed adjusting valve to the first feed flow, the method puts the furnace feed adjusting valve into cascade connection, specifically includes:
step S131: controlling the opening of a hearth feeding regulating valve to increase a preset opening, and waiting for a preset time period;
step S132: if the opening degree of the hearth feeding regulating valve reaches the preset maximum opening degree, or
If the total feed flow reaches the first feed flow, executing step S133, otherwise returning to step S131;
step S133: and after the hearth feeding total amount controller is set to be in an automatic state, the hearth feeding adjusting valve is put into cascade connection.
Specifically, the hearth feeding adjusting valves in the cracking furnace comprise a plurality of hearth feeding adjusting valves, and the control flow is used for adjusting the hearth feeding adjusting valves simultaneously. The total feed flow specifically refers to the sum of the feed flows of the plurality of feed regulating valves. If the total flow of feeding reaches a first feeding flow, the hearth feeding adjusting valves are automatically put into use, the single feeding flow of each hearth feeding adjusting valve can be averagely calculated according to the number of the hearth feeding adjusting valves, the feeding flow of any hearth feeding adjusting valve reaches the single feeding flow, and the corresponding hearth feeding adjusting valves are automatically put into use.
In the embodiment of the application, in the material initial stage of throwing, under the low flow state, through increasing furnace feeding regulating valve aperture many times according to predetermineeing the logic, slow control feeding flow, throw the material as gently as possible, when reaching to predetermine the maximum aperture or the total flow of feeding reaches first feeding flow until furnace feeding regulating valve aperture, feeding flow reaches the automatically regulated requirement, then switch furnace feeding regulating valve into automatic control, avoid the staff frequently manually operation furnace feeding regulating valve under the low flow state.
Further, as shown in fig. 4, in step S103, the method further includes:
step S134: if the opening of the hearth feeding adjusting valve is smaller than the preset maximum opening after a first feeding time period, and the total feeding flow is smaller than the first feeding flow, an alarm is given; and/or
And if the opening of the hearth feeding regulating valve is controlled to increase by a preset opening and the step execution times of waiting for a preset time period exceed the preset maximum times, giving an alarm.
The first feeding time period is set according to work experience, the hearth feeding in the first stage can be completed in the first feeding time period under the normal state of the cracking furnace, the first feeding time period can be set to be 15-25 minutes, if the hearth feeding in the first stage cannot be completed in the first feeding time period, or the opening adjustment times of the hearth feeding adjusting valve reach an upper limit threshold value, the problem of the cracking furnace feeding adjusting valve or other equipment is solved, an alarm is triggered at the moment, and a worker is reminded to check.
The embodiment of the application sets up the alarm logic during the furnace feeding in the first stage, can throw the material in the pyrolysis furnace and in time send out the police dispatch newspaper when having the problem, guarantees going on smoothly of feeding.
Further, as shown in fig. 5, in step S104, after confirming the first state of the furnace, the total feed flow of the furnace feed regulating valve is regulated to a second feed flow;
step S141: confirming a first state of the hearth;
step S142: setting a target flow value of a hearth feeding total amount controller as a second feeding flow, and automatically adjusting the opening of a hearth feeding adjusting valve by the hearth feeding total amount controller;
step S143: and if the total feeding flow is less than the second feeding flow after the second feeding time period, giving an alarm.
As shown in fig. 6, in step S105, after confirming the second state of the furnace, adjusting the total feeding flow of the furnace feeding adjusting valve to the third feeding flow, and simultaneously setting the furnace purging steam adjusting valve to be manual and adjusted to the zero position, specifically includes:
step S151: confirming a second state of the hearth;
step S152: setting a target flow value of a hearth feeding total amount controller as a third feeding flow, and automatically adjusting the opening of a hearth feeding adjusting valve by the hearth feeding total amount controller;
step S153: if the total feed flow is less than the third feed flow after a third dosing period of time, an alarm is issued;
step S154: the hearth purging steam regulating valve is set to be manual and adjusted to a zero position.
As shown in fig. 7, after the determination of the third state of the furnace in step S106, the adjusting the total feed flow of the furnace feed adjusting valve to the fourth feed flow, and simultaneously reducing the furnace dilution steam flow to the preset dilution steam flow specifically includes:
step S161: confirming the third state of the hearth;
step S162: setting a target flow value of a hearth feeding total amount controller as a fourth feeding flow, and automatically adjusting the opening of a hearth feeding adjusting valve by the hearth feeding total amount controller;
step S163: if the total feeding flow is less than the fourth feeding flow after the fourth feeding time period, an alarm is given;
step S164: and reducing the flow of the dilution steam in the hearth to the preset flow of the dilution steam.
In the embodiment of the application, the total feeding flow is increased from the first feeding flow to the second feeding flow, from the second feeding flow to the third feeding flow, from the third feeding flow to the fourth feeding flow, the target flow values of the total feeding quantity controller of the hearth are set, and the total feeding quantity controller of the hearth automatically adjusts the opening of the feeding regulating valve of the hearth through cascade control to uniformly increase the feeding flow to the target flow values.
And in the process of increasing the feeding flow of each stage, a second feeding time period, a third feeding time period and a fourth feeding time period are respectively set, if the total feeding flow cannot be increased to a target flow value in the corresponding time period, an alarm is triggered, and the feeding of each stage is ensured to be smoothly carried out. And the second feeding time period, the third feeding time period and the fourth feeding time period can be set to be 15-25 minutes.
In one embodiment, the step of performing stage state monitoring further comprises performing stage state monitoring after the first state confirmation of the furnace, the second state confirmation and the third state confirmation of the furnace;
the phased status monitoring, comprising:
if the furnace oxygen content is within the preset charging furnace oxygen content range, and
the drum liquid level is within a preset feed drum liquid level range, an
The furnace outlet temperature is within a preset range of the furnace outlet temperature of the fed material, and
the temperature of the ultrahigh pressure steam (SS temperature) is in the range of the temperature of the preset charging ultrahigh pressure steam,
the next step is performed.
Specifically, in the feeding process, after the furnace state is confirmed after the feeding operation of each stage is completed, the stage state monitoring is executed to ensure that each state of the cracking furnace meets the condition of continuous feeding. As an example, the parameters of the phased state monitoring are: the oxygen content of the hearth is 3-14%, the liquid level of the steam drum is 40-70%, the temperature of the hearth outlet is 805-825 ℃, and the temperature of the ultrahigh pressure steam is 501-528 ℃. During the stage state monitoring, if any one of the parameters is not in the preset range, the detection is carried out again after waiting for the set time, and if the detection times or the waiting time reach the upper limit, an alarm is triggered to remind a worker to carry out manual monitoring and intervention.
According to the embodiment of the application, the state of each stage is monitored before feeding in each stage, so that all parameters of the cracking furnace can meet the feeding requirement in the feeding process, and the feeding stability is ensured.
In one embodiment, as shown in fig. 8, the automatic feeding method of the ethylene cracking furnace further comprises:
step S201: responding to a feeding starting instruction, and displaying real-time execution steps on a human-computer interaction interface, wherein the real-time execution steps comprise parameter confirmation and state confirmation;
step S202: responding to a pause feeding instruction, and executing the step S203;
step S203: suspending the feeding operation, and then executing the step S204 and the step S205;
step S204: if receiving a material feeding continuing instruction, continuing to execute material feeding operation, otherwise, returning to the step S203;
step S205: if a parameter modification instruction is received, modifying the corresponding parameter according to the parameter modification instruction, otherwise, returning to the step S203.
In the feeding control method of the embodiment of the application, the execution step is displayed on a human-computer interaction interface in real time in the feeding process, as shown in fig. 9, the display interface in the execution process of step S101 in the foregoing embodiment judges each parameter or state in the system according to the interface display sequence, if the setting requirement is met, a "normal" or "confirmation" identifier is displayed on one side of the parameter or state, and preferably, the corresponding font color or background color can be changed according to whether the parameter or state meets the setting requirement, so that the worker can conveniently check the font color or background color.
In addition, in the feeding process, a worker can input a feeding pause command through the man-machine interaction section, the system stops feeding after receiving the feeding pause command, and during the feeding pause, the worker can manually adjust the state of the cracking furnace and modify various parameters of the cracking furnace during the feeding through a parameter modification command. The modification of each parameter needs to be authenticated by the authority, and the worker needs to log in an account with modification authority or input a preset authority password to modify the parameters, so that the operation safety of the program is ensured.
In the embodiment of the application, the material feeding process can be displayed in real time through the human-computer interaction interface, workers can monitor the material feeding conveniently, various parameters can be corrected in the material feeding process, and the material feeding process can be adjusted in time when the material feeding fails.
The present application provides a storage medium storing computer instructions for performing all the steps of the automatic feeding method of an ethylene cracking furnace in any one of the above method embodiments when the computer executes the computer instructions.
Fig. 10 shows an electronic device of the present application, comprising:
at least one processor 1001; and (c) a second step of,
a memory 1002 communicatively coupled to the at least one processor 1001; wherein, the first and the second end of the pipe are connected with each other,
the memory 1002 stores instructions executable by the at least one processor 1001, the instructions being executable by the at least one processor 1001 to enable the at least one processor 1001 to perform all the steps of the ethylene-cracking furnace auto-feed method in any one of the method embodiments described above.
In fig. 10, one processor 1002 is taken as an example:
the electronic device may further include: an input device 1003 and an output device 1004.
The processor 1001, the memory 1002, the input device 1003, and the display device 1004 may be connected by a bus or by another method, and are illustrated as being connected by a bus.
The memory 1002, which is a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the automatic feeding method of the ethylene cracking furnace in the embodiments of the present application, for example, the method flows shown in fig. 1-8. The processor 1001 executes various functional applications and data processing by running nonvolatile software programs, instructions and modules stored in the memory 1002, so as to implement the automatic feeding method of the ethylene cracking furnace in the above embodiment.
The memory 1002 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the automatic charging method of the ethylene cracking furnace, and the like. Further, the memory 1002 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 1002 optionally includes memory remotely located from processor 1001, which may be connected via a network to a device that performs an ethylene-cracking furnace auto-feed method. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 1003 may receive input from a user click and generate signal inputs related to user settings and function controls for the automatic batch method of the ethylene-cracking furnace. The display device 1004 may include a display screen or the like.
The ethylene-cracking furnace auto-feed method of any of the above method embodiments is performed when the one or more modules are stored in the memory 1002 and executed by the one or more processors 1001.
What has been described above is merely the principles and preferred embodiments of the present application. It should be noted that, for those skilled in the art, the embodiments obtained by appropriately combining the technical solutions respectively disclosed in the different embodiments are also included in the technical scope of the present invention, and several other modifications may be made on the basis of the principle of the present application and should be regarded as the protective scope of the present application.
Claims (10)
1. An automatic feeding method of an ethylene cracking furnace is characterized by comprising the following steps: responding to a feeding starting instruction, and executing the following steps:
the method comprises the following steps of:
controlling the state of each working system of the cracking furnace to be a preparation state before feeding;
adjusting the temperature of the hearth outlet to be the temperature of the hearth outlet before feeding, and confirming that the hearth valve interlocking state is in the hearth valve interlocking state before feeding;
a material feeding step: when the feeding flow reaches one stage, the feeding flow is continuously increased after the state is confirmed;
adjusting the total feed flow of a hearth feed adjusting valve to a first feed flow, and putting the hearth feed adjusting valve into cascade;
after the first state of the hearth is confirmed, adjusting the total feed flow of the hearth feed adjusting valve to a second feed flow;
after confirming the second state of the hearth, adjusting the total feed flow of the hearth feed adjusting valve to a third feed flow, and simultaneously setting a hearth purging steam adjusting valve to be manual and adjusting to a zero position;
after the third state of the hearth is confirmed, adjusting the total feed flow of the hearth feed adjusting valve to a fourth feed flow, and simultaneously reducing the hearth dilution steam flow to a preset dilution steam flow;
in the initial feeding stage, in a low-flow state, feeding is slowly controlled by increasing the opening of a hearth feeding regulating valve for multiple times according to preset logic, and feeding is performed as slowly as possible until the opening of the hearth feeding regulating valve reaches a preset maximum opening or the total feeding flow reaches a first feeding flow, the feeding flow reaches an automatic regulation requirement, the hearth feeding regulating valve is switched to automatic control, and a worker is prevented from frequently and manually operating the hearth feeding regulating valve in the low-flow state;
and in the process of increasing the feeding flow of each stage, a second feeding time period, a third feeding time period and a fourth feeding time period are respectively set, and if the total feeding flow cannot be increased to a target flow value in the corresponding time period, an alarm is triggered to ensure the smooth feeding of each stage.
2. The automatic feeding method of the ethylene cracking furnace according to claim 1, characterized by further comprising the post-feeding step of:
putting a hearth dilution steam controller into cascade connection, and controlling the flow of dilution steam in proportion;
adjusting the flow of the vulcanizing agent to a preset flow of the vulcanizing agent;
and adjusting the temperature of the hearth outlet according to the cracking depth.
3. The automatic feeding method of an ethylene cracking furnace according to claim 1,
adjusting furnace exit temperature is furnace exit temperature before throwing the material, specifically includes:
setting the target temperature of the hearth outlet temperature controller as the temperature of the hearth outlet before feeding, wherein the heating rate is a preset heating rate;
and waiting for a preset temperature rise time period until the temperature of the hearth outlet is the temperature of the hearth outlet before feeding.
4. The automatic feeding method of the ethylene cracking furnace according to claim 1, wherein the step of cascading the furnace feeding adjusting valve after adjusting the total feeding flow of the furnace feeding adjusting valve to the first feeding flow specifically comprises:
controlling the opening of a hearth feeding regulating valve to increase a preset opening, and waiting for a preset time period;
if the opening degree of the hearth feeding regulating valve reaches the preset maximum opening degree, or
The total flow rate of the feeding materials reaches the first feeding flow rate
And after the hearth feeding total amount controller is set to be in an automatic state, the hearth feeding adjusting valve is put into cascade connection, otherwise, the hearth feeding adjusting valve is returned to control the opening of the hearth feeding adjusting valve to increase the preset opening, and the step of waiting for the preset time period is carried out.
5. The automatic feeding method of an ethylene cracking furnace according to claim 4, wherein the furnace feed regulating valve is used for cascading after the total feed flow of the furnace feed regulating valve is adjusted to the first feed flow, and the method further comprises the following steps:
if the opening of the hearth feeding adjusting valve is smaller than the preset maximum opening after a first feeding time period, and the total feeding flow is smaller than the first feeding flow, an alarm is given; and/or
And if the opening of the hearth feeding regulating valve is controlled to increase by a preset opening and the step execution times of waiting for a preset time period exceed the preset maximum times, giving an alarm.
6. The automatic feeding method of the ethylene cracking furnace according to claim 1, wherein the adjusting of the total feeding flow of the hearth feeding adjusting valve to a second feeding flow specifically comprises:
setting a target flow value of a hearth feeding total amount controller as a second feeding flow, and automatically adjusting the opening of a hearth feeding adjusting valve by the hearth feeding total amount controller;
if the total feeding flow is less than the second feeding flow after a second feeding time period, an alarm is given;
the adjusting of the total feed flow of the hearth feed adjusting valve to a third feed flow specifically comprises:
setting a target flow value of a hearth feeding total amount controller as a third feeding flow, and automatically adjusting the opening of a hearth feeding adjusting valve by the hearth feeding total amount controller;
if the total feed flow is less than the third feed flow after a third dosing period of time, an alarm is issued;
the adjustment furnace feed governing valve's total flow of feeding to fourth feed flow specifically includes:
setting a target flow value of a hearth feeding total amount controller as a fourth feeding flow, and automatically adjusting the opening of a hearth feeding adjusting valve by the hearth feeding total amount controller;
and if the total feeding flow is less than the fourth feeding flow after the fourth feeding time period, giving an alarm.
7. The automatic charging method for the ethylene cracking furnace according to claim 1, further comprising monitoring the stage state after the confirmation of the first state of the furnace, the confirmation of the second state, and the confirmation of the third state of the furnace;
the phased status monitoring, comprising:
if the furnace oxygen content is within the preset charging furnace oxygen content range, and
the drum liquid level is within a preset feed drum liquid level range, an
The furnace outlet temperature is within a preset range of the furnace outlet temperature of the fed material, and
the temperature of the ultrahigh pressure steam is within the preset feeding ultrahigh pressure steam temperature range,
the next step is performed.
8. The automatic feeding method of the ethylene cracking furnace according to claim 1, further comprising:
responding to a feeding starting instruction, and displaying real-time execution steps on a human-computer interaction interface, wherein the real-time execution steps comprise parameter confirmation and state confirmation;
in response to the feeding pause instruction, pausing execution of feeding operation until receiving a feeding continuation instruction, and continuing execution of feeding operation;
and during the feeding operation pause, if a parameter modification instruction is received, modifying the corresponding parameter according to the parameter modification instruction.
9. A storage medium storing computer instructions for performing all the steps of the automatic charging method for an ethylene cracking furnace according to any one of claims 1 to 8 when the computer instructions are executed by a computer.
10. An electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform all the steps of the ethylene-cracking furnace auto-feed method of any one of claims 1-8.
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| US4242196A (en) * | 1978-10-27 | 1980-12-30 | Kureha Kagaku Kogyo Kabushiki Kaisha | Mass production system of highly aromatic petroleum pitch |
| US4371944A (en) * | 1981-01-16 | 1983-02-01 | Phillips Petroleum Company | Ethylene process control |
| US5324486A (en) * | 1986-02-02 | 1994-06-28 | Gaetano Russo | Hydrocarbon cracking apparatus |
| CN100338182C (en) * | 2004-10-29 | 2007-09-19 | 中国石油化工股份有限公司 | Cracking furnace of boiler tube with one-way reducing diameter |
| CN112303602B (en) * | 2019-08-02 | 2023-01-13 | 万华化学集团股份有限公司 | Improved method and device for utilizing heat of ethylene high-temperature pyrolysis gas |
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