CN108303890B - A kind of pyrolysis furnace beacon flint control method - Google Patents
A kind of pyrolysis furnace beacon flint control method Download PDFInfo
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- CN108303890B CN108303890B CN201810137974.2A CN201810137974A CN108303890B CN 108303890 B CN108303890 B CN 108303890B CN 201810137974 A CN201810137974 A CN 201810137974A CN 108303890 B CN108303890 B CN 108303890B
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
Abstract
The invention discloses a kind of pyrolysis furnace beacon flint control method, FI_IN is oil plant feed rate measuring instrumentss；TC_IN is furnace entrance oil plant temperature measuring instrument；TI_DS is the temperature measuring instrument of dilution steam generation；TC_COT is heater outlet temperature controller；Beacon flint controls relevant calculation process and executes in beacon flint controller, final output to fuel gas regulating valve；Sound state idea of balance of the pyrolysis furnace beacon flint control method based on total system material and energy, from the stable angle of overall process overall operation, dynamic relationship between comprehensive each parameter of pyrolysis furnace upstream and downstream, it quickly and effectively obtains upstream work information and implements the control of beacon flint in time, realize the integral intelligent control to respond to and cooperate with each other across a great distance between pyrolysis furnace upstream and downstream production technology.
Description
Technical field
The invention belongs to process industry production technical field, it is related to a kind of pyrolysis furnace beacon flint control method, this method can be with
Controlling plan design applied to pyrolysis furnace in process industry process units.
Background technique
In petrochemical industry production, pyrolysis furnace is the key that influence target product yield and plant energy consumption energy consumption equipment, because
This, pyrolysis furnace it is efficiently and smoothly operated particularly significant.Pyrolysis furnace day-to-day operation in, the steady control of pyrolysis furnace heater outlet temperature
System be always measure pyrolysis furnace even running key index, and heater outlet temperature it is steady whether be directly related to downstream chilling
And the normal operation of separative unit.In general, pyrolysis furnace uses fuel gas or fuel oil as heat source, passes through and adjust fuel tolerance reality
Now heater outlet temperature is steadily controlled, but cracks heater outlet temperature and is often steamed by furnace entrance feed rate, feeding temperature and dilution
The influence of stripping temperature variation, in turn results in the fluctuation of fuel tolerance, be unfavorable for pyrolysis furnace or even whole device upgrading synergy and
Even running.
For this purpose, the present invention proposes a kind of pyrolysis furnace control method of brand new ideas, referred to as pyrolysis furnace beacon flint control method.Beacon
Flint control thought is from the most fast most effective Military Early Warning facility of this ancient times of China's beacon tower transmitting information.It is raw in process industry
It produces in device, needs to guarantee between the process that is mutually related orderly to adjust, when upstream process changes, downstream process needs fast
It is fast effectively to obtain upstream process work information, corresponding adjusting is made in time, is responded to and cooperate with each other across a great distance between realization upstream and downstream production technology
Integral intelligent control, prevention downstream operating condition adjust the normal steady production for not in time and influencing device.The present invention passes beacon flint
The thought of delivery signal is introduced into the control program of pyrolysis furnace, according to the ginseng such as furnace feed rate, temperature and dilution steam generation temperature
Several real time execution change informations, the dynamic and static idea of balance based on system material and energy carry out pyrolysis furnace fuel tolerance
Intelligent Dynamic orderly adjustment realizes the smooth long term running of pyrolysis furnace.
Summary of the invention
It is an object of the invention to devise a kind of pyrolysis furnace beacon flint control method, the even running of pyrolysis furnace is to petroleum
The energy efficiency that tooling is set has great influence, and raw material, which enters, carries out Pintsch process in pyrolysis furnace, generates target product and by-product
Product component, the operation quality of pyrolysis furnace directly influences the distribution of final goal product, and the heater outlet temperature of pyrolysis furnace is flat
There is large effect to subsequent chilling, separative unit whether steady.Therefore, pyrolysis furnace is efficiently and smoothly operated particularly significant.
During the day-to-day operation of pyrolysis furnace, the variation of furnace entrance inlet amount, feeding temperature and dilution steam generation temperature is pyrolysis furnace system
It unites main interference source, directly affects the even running of pyrolysis furnace.Therefore, present invention combination control theory, computer technology and
Chemical process principle, the dynamic and static equilibrium principle based on system material and energy propose a kind of pyrolysis furnace beacon flint control method,
It is specific as follows.
The technical solution adopted by the present invention is a kind of pyrolysis furnace beacon flint control method, and pyrolysis furnace beacon flint control structure figure is as schemed
Shown in 1, in figure, FI_IN is oil plant feed rate measuring instrumentss；TC_IN is furnace entrance oil plant temperature measuring instrument；TI_DS is
The temperature measuring instrument of dilution steam generation；TC_COT is heater outlet temperature controller；Beacon flint controls relevant calculation process in beacon flint
It is executed in controller, final output to fuel gas regulating valve.
According to conservation of energy principle, oil plant is warming up to heat and fuel air lift required for the temperature of outlet of still technique requirement
The heat of confession is equal, then has following expression,
Q=cm (TCOT-TIN) (1)
In formula, Q is the heat provided needed for oil plant heating；C is oil plant specific heat capacity；M is oil plant mass flow steady-state value；
TCOTFor heater outlet temperature steady-state value, i.e. setting value；TINFor furnace entrance oil plant temperature steady-state value.Due to furnace entrance oil plant feeding flow
Amount and temperature are dynamic changes, and therefore, the heat that fuel gas provides is also required to synchronous variation, just can guarantee heater outlet temperature
Steadily, then the dynamic computational formula of heat is as follows:
Wherein, Δ Q is thermal change amount；Δ m is entrance oil plant mass-flow change amount, i.e. changes in flow rate amount；ΔTINFor
Entrance oil plant temperature variation, the mass change and temperature variation of oil plant can be calculated by DCS real-time data collection.Heat
Variable quantity is as follows:
Δ Q=c Δ m (TCOT-TIN)-cmΔTIN-cΔmΔTIN (3)
The variable quantity that heat Relative steady-state can be obtained is as follows:
Dynamic cooperation adjusting is carried out to fuel tolerance according to the change information of heat, reduces external disturbance to the shadow of pyrolysis furnace
It rings, realizes the even running of pyrolysis furnace, it is as shown in Figure 2 that pyrolysis furnace beacon flint controls computing module.
TIN、ΔTIN、TDS、ΔTDS, m, Δ m, TC_COT.OP be pyrolysis furnace beacon flint controller input, BFC.OP is to split
Solve the output of furnace beacon flint controller.
In figure, TC_COT.OP is the output for cracking heater outlet temperature controller, and BFC.OP is the control output of final beacon flint,
Since dilution steam generation temperature change also influences whether the normal operation of pyrolysis furnace, beacon flint control is also added in dilution steam generation temperature parameter
The operation of device processed, TDSFor dilution steam generation temperature steady-state value, Δ TDSFor dilution steam generation temperature dynamic variable quantity, the control output of beacon flint
Operation is as follows.
Wherein, η is beacon flint auxiliary coefficient；μ is that beacon flint velocity coefficient, η and μ choose according to pyrolysis furnace practical operation situation.
Pyrolysis furnace beacon flint control method proposed by the present invention can directly be implemented in device DCS Distributed Control System, tool
Body implementation steps are as follows:
S1, according to the actual conditions of pyrolysis furnace upstream and downstream technique unit, determine the related ginseng for influencing pyrolysis furnace even running
Number；
S2, according to pyrolysis furnace beacon flint control principle, develop beacon flint controller module in DCS Distributed Control System, and
Lower adjustment examination in control system；
S3, in debugging process, it is appropriate to choose beacon flint auxiliary coefficient η and beacon flint speed according to pyrolysis furnace practical operation situation
Rate coefficient μ, so that pyrolysis furnace operational effect is steady.
Pyrolysis furnace beacon flint control method according to the present invention is compared with traditional control method to be had the advantages that
1, in conjunction with the principle of ancient times beacon flint transmitting information, a kind of completely new pyrolysis furnace control theory and method are proposed, referred to as
Pyrolysis furnace beacon flint control method, this method is using In Cracking Feedstock amount, feeding temperature and dilution steam generation temperature as influence pyrolysis furnace
The principal element of normal operation designs beacon flint controller, can effectively reduce cracking heater outlet temperature and the fluctuation of fuel tolerance, improve
The control precision of cracking severity reduces device operation energy consumption.
2, sound state idea of balance of the pyrolysis furnace beacon flint control method based on total system material and energy, from overall process entirety
The angle to run smoothly is set out, and the dynamic relationship between comprehensive each parameter of pyrolysis furnace upstream and downstream quickly and effectively obtains upstream operating condition letter
The control of beacon flint is ceased and implemented in time, realizes the integral intelligent control to respond to and cooperate with each other across a great distance between pyrolysis furnace upstream and downstream production technology.
Detailed description of the invention
Fig. 1 pyrolysis furnace beacon flint control structure figure
Fig. 2 pyrolysis furnace beacon flint controls computing module structure chart
Pyrolysis furnace relevant parameter operation curve before the control of Fig. 3 beacon flint is implemented
Pyrolysis furnace relevant parameter operation curve after the control of Fig. 4 beacon flint is implemented
Specific embodiment
For new method proposed by the invention, it is explained below with reference to the example of an industrial application.
Certain ethylene unit, the external raw material of device enter pyrolysis furnace and are cracked, generate ethylene, propylene, butadiene with
And other byproducts, the operation level of pyrolysis furnace directly determine the yield of each product and the energy consumption of device.Pyrolysis furnace schematic diagram
As shown in Figure 1, the charging of furnace entrance is respectively equipped with flow measurement instrument FI_IN, temperature measuring instrument TI_IN and dilution steam generation temperature
Instrument TI_DS, the situation of change of real-time measurement pyrolysis furnace entrance oil plant and steam, heater outlet temperature TC_COT pass through fuel air valve
It adjusts.By the influence of fluctuations of pyrolysis furnace upstream, pyrolysis furnace entrance oil plant flow and temperature also can frequent fluctuation, and then influence cracking
Heater outlet temperature causes the fluctuation of fuel tolerance, while also influencing whether the normal operation of downstream quenching unit.For this purpose, to this
Pyrolysis furnace implements beacon flint control proposed by the invention, reduces influence of the pyrolysis furnace entrance oil plant Parameters variation to pyrolysis furnace.
Pyrolysis furnace furnace entrance oil plant temperature TINSteady-state value is 38 DEG C, cracks heater outlet temperature TOUTSteady-state value is 825 DEG C；Enter
Mouth mass flow m steady-state value is 35t/h；Dilution steam generation temperature steady-state value TDSIt is 235 DEG C；Beacon flint auxiliary coefficient η value 0.25；Beacon
Flint velocity coefficient μ value 0.86, entrance oil plant mass-flow change amount Δ m, temperature variation Δ TINAnd dilution steam generation temperature Δ
TDSVariable quantity is acquired in real time by control system.According to control system real-time data collection, according to beacon flint control set forth in the present invention
Method processed is implemented on pyrolysis furnace, is embodied in program in DCS Distributed Control System and realize, implements front and back correlated variables operation
Curve is as shown in Figure 3 and Figure 4.
By Fig. 3, Fig. 4 as it can be seen that cracking heater outlet temperature after pyrolysis furnace implementation beacon flint control and fuel tolerance running smoothly,
Before effect is substantially better than implementation.
Claims (2)
1. a kind of pyrolysis furnace beacon flint control method, it is characterised in that: FI_IN is oil plant feed rate measuring instrumentss；TC_IN is furnace
Entrance oil plant temperature measuring instrument；TI_DS is the temperature measuring instrument of dilution steam generation；TC_COT is heater outlet temperature controller；
Beacon flint controls relevant calculation process and executes in beacon flint controller, final output to fuel gas regulating valve；
According to conservation of energy principle, oil plant is warming up to what heat and fuel gas required for the temperature of outlet of still technique requirement provided
Heat is equal, then has following expression,
Q=cm (TCOT-TIN) (1)
In formula, Q is the heat provided needed for oil plant heating；C is oil plant specific heat capacity；M is oil plant mass flow steady-state value；TCOTFor
Heater outlet temperature steady-state value, i.e. setting value；TINFor furnace entrance oil plant temperature steady-state value；Due to furnace entrance oil plant feed rate and temperature
Degree is dynamic change, and therefore, the heat that fuel gas provides is also required to synchronous variation, just can guarantee the steady of heater outlet temperature,
Then the dynamic computational formula of heat is as follows:
Wherein, Δ Q is thermal change amount；Δ m is entrance oil plant mass-flow change amount, i.e. changes in flow rate amount；ΔTINFor entrance
Oil plant temperature variation, the mass change and temperature variation of oil plant can be calculated by DCS real-time data collection；Thermal change
Amount is as follows:
Δ Q=c Δ m (TCOT-TIN)-cmΔTIN-cΔmΔTIN (3)
The variable quantity that heat Relative steady-state can be obtained is as follows:
Dynamic cooperation adjusting is carried out to fuel tolerance according to the change information of heat, reduces influence of the external disturbance to pyrolysis furnace,
Realize the even running of pyrolysis furnace；
TIN、ΔTIN、TDS、ΔTDS, m, Δ m, TC_COT.OP be pyrolysis furnace beacon flint controller input, BFC.OP is pyrolysis furnace
The output of beacon flint controller；
TC_COT.OP is the output for cracking heater outlet temperature controller, and BFC.OP is the control output of final beacon flint, since dilution is steamed
Stripping temperature changes the normal operation for also influencing whether pyrolysis furnace, and dilution steam generation temperature parameter is also added to the fortune of beacon flint controller
It calculates, TDSFor dilution steam generation temperature steady-state value, Δ TDSFor dilution steam generation temperature dynamic variable quantity, it is as follows that the control of beacon flint exports operation
It is shown；
Wherein, η is beacon flint auxiliary coefficient；μ is that beacon flint velocity coefficient, η and μ choose according to pyrolysis furnace practical operation situation.
2. a kind of pyrolysis furnace beacon flint control method according to claim 1, it is characterised in that: the pyrolysis furnace beacon flint control of proposition
Method processed can directly be implemented in device DCS Distributed Control System, and specific implementation step is as follows:
S1, according to the actual conditions of pyrolysis furnace upstream and downstream technique unit, determine the relevant parameter for influencing pyrolysis furnace even running；
S2, according to pyrolysis furnace beacon flint control principle, beacon flint controller module is developed in DCS Distributed Control System, and controlling
Lower adjustment examination in system；
S3, in debugging process, it is appropriate to choose beacon flint auxiliary coefficient η and beacon flint rate system according to pyrolysis furnace practical operation situation
Number μ, so that pyrolysis furnace operational effect is steady.
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