CN102073271A - Intelligent control method and system for delayed coking device - Google Patents

Abstract

The invention discloses an intelligent control method for a delayed coking device, which comprises the following steps: S1) setting operating variables of intelligent control of the delayed coking device, an initial value of state marker bit, and thresholds of place value of a feed valve and relative quantity of blowing steam, wherein the relative quantity of the blowing steam is the ratio of the flow rate of the blowing steam to the total feeding flow rate of a heating furnace; S2) acquiring the current place value of the feed valve and the current relative quantity of the blowing steam through a distributed control system, and judging the process step which needs to be performed according to the current place value of the feed valve and the current relative quantity of the blowing steam; and S3) adjusting the operating variables and the state marker bit correspondingly according to the process step, and returning to the step S2) after completing the adjustment. With the adoption of the method, the intelligent compensation control of the delayed coking device can be realized, and the technical problems of single processing of switching disturbance, incapability of realizing intelligentized effective suppression and incapability of performing optimal control during the switching process can be solved.

Description

Delayed coking unit intelligence control method and system

Technical field

The present invention relates to the petrochemical technology field, particularly a kind of delayed coking unit intelligence control method and system.

Background technology

Delayed coking is the process of a class strong coupling, non-linear, time variation, large time delay and multi-constraint condition.Along with the increasing trend of heavy crude proportion in the oil extraction has all appearred in countries in the world and China, simultaneously because the continuous variation of petroleum products consumption structure, the heavy oil demand is day by day compressed, lightweight oil (particularly diesel oil) demand increases rapidly, to being used to make the metallurgical electrode of using, particularly the high-quality petroleum coke demand of ultra-high power graphite electrode constantly increases, and delay coking process more and more is subjected to people's attention now.Because delay coking process is simple, adaptability to raw material is strong, and the value of the product height, thereby also more and more higher to its control requirement, to satisfy the demand of maximization of economic benefit.

At its production characteristics that " should promote the coke drum coking to suppress tube coking again, should guarantee that continuous production carries out cyclical intermission again and switch ", the automaticity of delayed coking unit is not high, domestic more obvious both at home and abroad.At first, cut in the tower process at coke drum, basic still based on manual experiential operating, the effect of different material, different operating worker, different time incision tower and to downstream unit also is not quite similar as the influence of main fractionating tower.In addition, the delayed coking main fractionating tower belongs to polycomponent, the complicated fractionator of many side lines, on the one hand, has characteristics non-linear, large time delay; On the other hand, periodically the coke drum blocked operation is introduced larger interference for whole process of production easily, and (Proportion IntegrationDifferentiation, PID) controller is difficult to effective disturbance suppression to conventional proportion integration differentiation.In the last few years, various advanced control technologys have obtained in the chemical process using widely in each, when improving the business economic benefit, have advantages such as investment is little, instant effect, yet so far, also show slightly single for switching the processing of disturbing in the advanced control technology of delayed coking both at home and abroad, major part is to handle as the common interference volume of advanced person's control, does not realize intelligentized effective inhibition, and also is not optimized control for handoff procedure.

Summary of the invention

(1) technical matters that will solve

The technical problem to be solved in the present invention be how to solve can't delayed coking automatic control, it is single to switch the processing of disturbing, and can't realize intelligentized effective inhibition, and the technical matters that can't be optimized control in the handoff procedure.

(2) technical scheme

For solving the problems of the technologies described above, the invention provides a kind of delayed coking unit intelligence control method, may further comprise the steps:

S1: initial value, the charging valve position of the performance variable of delayed coking unit Based Intelligent Control and state flag bit is set and blows the threshold value of steam relative quantity, describedly blow the ratio that the steam relative quantity refers to blow steam flow and heating furnace combined feed flow;

S2: obtain current inlet valve place value and the current steam relative quantity that blows by Distributed Control System (DCS), judge the processing step that current need carry out according to described current inlet valve place value and the current steam relative quantity that blows;

S3: according to described processing step described performance variable and state flag bit are adjusted accordingly, return step S2 after adjustment is finished.

Wherein, described performance variable comprises: the main fractionating tower feed rate, go up and to return the tower flow under feed rate, stage casing circular flow, the wax slop and flow is followed on the top; Described state flag bit comprises: preheating zone bit, little air blowing zone bit and the zone bit of blowing greatly; The threshold value of described charging valve position comprises: nominal situation valve position threshold value, pressure testing valve position threshold value, preheating valve position threshold value, preheating subordinate phase valve position threshold value, preheating phase III valve position threshold value, little air blowing valve position threshold value and the valve position threshold value of blowing greatly; The described threshold value that blows the steam relative quantity comprises: nominal situation blows steam relative quantity threshold value, pressure testing and blows steam relative quantity upper limit threshold, pressure testing and blow steam relative quantity lower threshold, preheating and blow steam relative quantity threshold value, preheating subordinate phase and blow steam relative quantity threshold value, preheating phase III and blow that steam relative quantity threshold value, little air blowing blow steam relative quantity lower threshold, little air blowing blows steam relative quantity upper limit threshold and blows steam relative quantity threshold value greatly.

Wherein, described step S2 specifically may further comprise the steps:

S201: inlet valve place value and the current steam relative quantity that blows of obtaining the inlet valve place value of current first coke drum, current second coke drum by Distributed Control System (DCS);

S202: judge whether to enter " nominal situation " processing step according to following logical relation (1),

[(V ₁+V ₂)≤CV ₂]&(F _steam≤CF ₂) (1)

Wherein, V ₁Be the inlet valve place value of described current first coke drum, V ₂Be the inlet valve place value of described current second coke drum, F _SteamBe described current steam relative quantity, the CV of blowing ₂Be described nominal situation valve position threshold value, CF ₂For described nominal situation blows steam relative quantity threshold value; Presentation logic with;

If the logic determines result of logical relation (1) is true, then be judged to be and enter " nominal situation " processing step, and execution in step S3, if the logic determines result is vacation, then execution in step S203;

S203: judge whether to enter " pressure testing " processing step according to following logical relation (2),

[(V ₁+V ₂)≤CV ₃]&(CF ₃₁≤F _steam≤CF ₃₂) (2)

Wherein, CV ₃Be described pressure testing valve position threshold value, CF ₃₁For described pressure testing blows steam relative quantity lower threshold, CF ₃₂For described pressure testing blows steam relative quantity upper limit threshold;

If the logic determines result of logical relation (2) be true, then be judged to be and enter " pressure testing " processing step, and execution in step S3, if the logic determines result is vacation, execution in step S204 then,

S204: judge whether to enter " preheating " processing step according to following logical relation (3),

[(V ₁+V ₂)≥CV ₄]&(F _steam≤CF ₄) (3)

Wherein, CV ₄Be described preheating valve position threshold value, CF ₄For described preheating blows steam relative quantity threshold value;

If the logic determines result of logical relation (3) is true, then be judged to be and enter " preheating " processing step, and execution in step S205, if the logic determines result is false, execution in step S208 then, described " preheating " processing step comprises: " preheating begins " and " preheating preparation " technology substep;

S205: judge whether to enter " preheating begins " technology substep according to described preheating zone bit, if described preheating zone bit is true, then be judged to be and enter " preheating begins " technology substep, and execution in step S206, if described preheating zone bit is false, then be judged to be and enter " preheating preparation " technology substep, and execution in step S3, described " preheating begins " technology substep further comprises: " preheating phase one ", " preheating subordinate phase " and " preheating phase III " technology substep;

S206: judge whether to enter " preheating phase one " technology substep according to following logical relation (4),

(V ₁+V ₂)≥CV ₆ (4)

Wherein, CV ₆Be described preheating subordinate phase valve position threshold value;

If the logic determines result of logical relation (4) be false, then be judged to be and enter " preheating phase one " technology substep, and execution in step S3, if the logic determines result is very, execution in step S207 then;

S207: judge whether to enter " preheating subordinate phase " technology substep according to following logical relation (5),

(V ₁+V ₂)≥CV ₇ (5)

Wherein, CV ₇Be described preheating phase III valve position threshold value;

If the logic determines result of logical relation (5) is false, then be judged to be and enter " preheating subordinate phase " technology substep, and execution in step S3, if the logic determines result is true, then is judged to be and enters " preheating phase III " technology substep, and execution in step S3;

S208: judge whether to enter " little air blowing " processing step according to following logical relation (6),

[(V ₁+V ₂)≥CV ₈]&(CF ₈₁≤F _steam≤CF ₈₂) (6)

Wherein, CV ₈Be little air blowing valve position threshold value, CF ₈₁For little air blowing blows steam relative quantity lower threshold, CF ₈₂For little air blowing blows steam relative quantity upper limit threshold;

If the logic determines result of logical relation (6) is true, then be judged to be and enter " little air blowing " processing step, and execution in step S209, if the logic determines result is false, execution in step S210 then, described " little air blowing " processing step comprises: " little air blowing begins " and " little air blowing preparation " technology substep;

S209: judge whether to enter " little air blowing begins " technology substep according to described little air blowing zone bit, if described preheating zone bit is true, then be judged to be and enter " little air blowing begins " technology substep, and execution in step S3, if described preheating zone bit is false, then be judged to be and enter " little air blowing preparation " technology substep, and execution in step S3;

S210: judge whether to enter " the big air blowing " processing step according to following logical relation (7),

[(V ₁+V ₂)≤CV ₁₀]&(F _steam≥CF ₁₀) (7)

Wherein, CV ₁₀Be big air blowing valve position threshold value, CF ₁₀For blowing steam relative quantity threshold value greatly;

If the logic determines result of logical relation (7) is true, then be judged to be and enter " the big air blowing " processing step, and execution in step S211, if the logic determines result is false, then be judged to be and enter " normal operation " processing step, and execution in step S3, described " the big air blowing " processing step comprises: " big air blowing begins " and " the big preparation of blowing " technology substep;

S211: judge whether to enter " big air blowing begins " technology substep according to described big air blowing zone bit, if described preheating zone bit is true, then be judged to be and enter " big air blowing begins " technology substep, and execution in step S3, if described preheating zone bit is false, then be judged to be and enter " the big preparation of blowing " technology substep, and execution in step S3.

Wherein, described step S3 specifically comprises:

If enter " nominal situation " processing step, then described preheating zone bit, little air blowing zone bit and the zone bit assignment of blowing greatly are vacation, described main fractionating tower liquid level is not carried out non-linear liquid level control;

If enter " pressure testing " processing step, then described preheating zone bit, little air blowing zone bit and the zone bit assignment of blowing greatly are vacation, described main fractionating tower liquid level is not carried out non-linear liquid level control;

If enter " preheating preparation " the technology substep in " preheating " processing step, then be true with described preheating zone bit assignment, be false with described little air blowing zone bit and big air blowing zone bit assignment, and described main fractionating tower liquid level is carried out non-linear liquid level control;

If enter " preheating begins " technology substep in " preheating " processing step, and be in " preheating phase one " technology substep in " preheating begins " technology substep, be true then with described preheating zone bit assignment, with described little air blowing zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control;

If enter " preheating begins " technology substep in " preheating " processing step, and be in " preheating subordinate phase " technology substep in " preheating begins " technology substep, be true then with described preheating zone bit assignment, with described little air blowing zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control, according to described first adjustment amount of going up feed rate the described feed rate of going up is adjusted, first adjustment amount according to described stage casing circular flow is adjusted described stage casing circular flow, adjust returning the tower flow under the described wax slop according to first adjustment amount that returns the tower flow under the described wax slop, first adjustment amount that follows flow according to described top follows flow adjustment to described top, and described first adjustment amount is the described feed rate of going up, the stage casing circular flow, return tower flow and top under the wax slop and follow in the flow one default number percent;

If enter " preheating begins " technology substep in " preheating " processing step, and be in " preheating phase III " technology substep in " preheating begins " technology substep, be true then with described preheating zone bit assignment, with described little air blowing zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control, according to described second adjustment amount of going up feed rate the described feed rate of going up is adjusted, second adjustment amount according to described stage casing circular flow is adjusted described stage casing circular flow, adjust returning the tower flow under the described wax slop according to second adjustment amount that returns the tower flow under the described wax slop, second adjustment amount that follows flow according to described top follows flow adjustment to described top, and described second adjustment amount is the described feed rate of going up, the stage casing circular flow, return tower flow and top under the wax slop and follow in the flow one default number percent;

If enter " little air blowing preparation " the technology substep in " little air blowing " processing step, be true then with described little air blowing zone bit assignment, with described preheating zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control;

If enter " little air blowing begins " the technology substep in " little air blowing " processing step, be true then with described little air blowing zone bit assignment, with described preheating zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control, according to described the 3rd adjustment amount of going up feed rate the described feed rate of going up is adjusted, the 3rd adjustment amount according to described stage casing circular flow is adjusted described stage casing circular flow, adjust returning the tower flow under the described wax slop according to the 3rd adjustment amount that returns the tower flow under the described wax slop, the 3rd adjustment amount that follows flow according to described top follows flow adjustment to described top, and described the 3rd adjustment amount is the described feed rate of going up, the stage casing circular flow, return tower flow and top under the wax slop and follow in the flow one default number percent;

If enter " the big preparation of blowing " the technology substep in " the big air blowing " processing step, be true then with described big air blowing zone bit assignment, with described preheating zone bit and little air blowing zone bit assignment is false, described main fractionating tower liquid level is not carried out non-linear liquid level control, pass through the iterative learning computing to the described feed rate of going up according to the main fractionating tower column bottom temperature, the stage casing circular flow, returning the tower flow under the wax slop adjusts respectively with each adjustment amount that flow is followed on the top, in the process that described adjustment amount is adjusted respectively, comprise first adjustment amount, second adjustment amount and the 3rd adjustment amount are adjusted respectively;

If enter " big air blowing begins " the technology substep in " the big air blowing " processing step, then described big air blowing zone bit assignment is true, with described preheating zone bit and little air blowing zone bit assignment is false, and described main fractionating tower liquid level is not carried out non-linear liquid level control.

Wherein, described non-linear liquid level control specifically may further comprise the steps:

S301: read level value at the bottom of the main fractionating tower tower by described Distributed Control System (DCS), calculate liquid level change speed at the bottom of the main fractionating tower tower according to following relationship formula (8),

VelLevel(k)＝Level(k)-Level(k-1) (8)

Wherein, k is current control cycle, and VelLevel (k) is a liquid level change speed at the bottom of the current main fractionating tower tower, and Level (k) is a level value at the bottom of the current main fractionating tower tower;

S302: judge the present located zone by level value at the bottom of the described main fractionating tower tower, be divided into following five kinds of situations:

One,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if the current inner region that is in:

Liquid level change speed at the bottom of the main fractionating tower tower greater than zero situation under, if satisfy following relationship formula (9), then reduce described main fractionating tower feed rate,

Level(k+T _NLC)＞HL (9)

If satisfy following relationship formula (10), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)≤HL (10)

Under the minus situation of liquid level change speed at the bottom of the main fractionating tower tower, if satisfy following relationship formula (11), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)≥LL (11)

If satisfy following relationship formula (12), then raise described main fractionating tower feed rate,

Level(k+T _NLC)＜LL (12)

Under the null situation of liquid level change speed at the bottom of the main fractionating tower tower, then described main fractionating tower feed rate is not regulated.

Two,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if the current exterior domain that is in:

Liquid level change speed at the bottom of the main fractionating tower tower more than or equal to zero situation under, then reduce described main fractionating tower feed rate;

Under the minus situation of liquid level change speed at the bottom of the main fractionating tower tower, then described main fractionating tower feed rate is not regulated;

Three,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if the current down exterior domain that is in:

Liquid level change speed at the bottom of the main fractionating tower tower greater than zero situation under, then described main fractionating tower feed rate is not regulated;

Liquid level change speed at the bottom of the main fractionating tower tower smaller or equal to zero situation under, then raise described main fractionating tower feed rate;

Four,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if current being in greater than outer upper limit zone:

Liquid level change speed at the bottom of the main fractionating tower tower more than or equal to zero situation under, then reduce described main fractionating tower feed rate;

Under the minus situation of liquid level change speed at the bottom of the main fractionating tower tower, if satisfy following relationship formula (13), then reduce described main fractionating tower feed rate,

Level(k+T _NLC)≥UpBd (13)

If satisfy following relationship formula (14), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)＜UpBd (14)

Five,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if current being in less than outer lower limit region:

Liquid level change speed at the bottom of the main fractionating tower tower smaller or equal to zero situation under, then raise described main fractionating tower feed rate;

Liquid level change speed at the bottom of the main fractionating tower tower greater than zero situation under, if satisfy following relationship formula (15), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)＞LowBd (15)

If satisfy following relationship formula (16), then raise described main fractionating tower feed rate

Level(k+T _NLC)≤LowBd (16)

In described relational expression (9)～(16), Level (k+T _NLC)=Level (k)+VelLevel (k) * T _NLC, T _NLCBe the prediction step of liquid level change, HL is the outer upper limit of default liquid level, and LL is the upper bound in the default liquid level for the outer lower limit of default liquid level, UpBd, and LowBd is lower bound in the default liquid level.

Wherein, described interative computation is specially:

By Distributed Control System (DCS) the main fractionating tower column bottom temperature is sampled, according to the variance of following formula (17) calculating main fractionating tower column bottom temperature,

$D{\left(h\right)}^2=\frac{1}{n-1}\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{(T_i-T_{\mathrm{SP}})}^2---\left(17\right)$

Wherein, h is the current iteration learning cycle, and D (h) is the variance of described main fractionating tower column bottom temperature, and n is the sampled point number, T _iBe the temperature of i sampled point at the bottom of the described main fractionating tower tower, T _SPBe described main fractionating tower column bottom temperature setting value;

Calculate converging factor according to following formula (18),

$\mathrm{\λ}\left(h\right)=\exp (-\frac{1}{|D\left(h\right)-D(h-1)|})---\left(18\right)$

Wherein, λ (h) is a converging factor;

Return the variable quantity that each adjustment amount of flow is followed on tower flow and top under feed rate, stage casing circular flow, the wax slop according to described go up that following formula (19) calculates next iterative learning cycle, variable quantity to described adjustment amount carries out in the calculation process, comprise that the variable quantity to first adjustment amount, second adjustment amount and the 3rd adjustment amount calculates respectively

ΔR _MVij(h)＝λ(h){K _P[D(h)-D(h-1)]+K _ID(h)+K _D[D(h)-2D(h-1)+D(h-2)]}

-(19)

Wherein, MVi is an i performance variable, and i=2 returns the tower flow under 3,4,5, the 2～5 performance variables corresponding successively described upward feed rate, stage casing circular flow, the wax slops and flow is followed on the top, R _MVij(h) be j adjustment amount of i performance variable, j=1, the 2,3, the 1st～3 corresponding successively first adjustment amount of adjustment amount, second adjustment amount and the 3rd adjustment amount, Δ R _MVij(h) be the variable quantity of j adjustment amount of i performance variable, K _PBe adjustable ratio gain, K _IBe integration adjustable gain, K _DBe the differential adjustable gain;

Return each adjustment amount that flow is followed on tower flow and top under feed rate, stage casing circular flow, the wax slop according to described go up that following formula (20) calculates next iterative learning cycle,

R _MVij(h+1)＝sgn(R _MVij(h))|ΔR _MVij(h)+|R _MVij(h)|| (20)

Wherein, $\mathrm{sgn}\left(R_{\mathrm{MVij}}\left(h\right)\right)=\left\{\begin{array}{c}+1,R_{\mathrm{MVij}}\left(h\right)>0\\ 0,R_{\mathrm{MVij}}\left(h\right)=0\\ -1,R_{\mathrm{MVij}}\left(h\right)<0\end{array}\right.,$

H+1 is next iterative learning cycle.

Wherein, in step S2, after judging the processing step that current need carry out, the processing step that described current need are carried out shows.

The invention also discloses a kind of delayed coking unit intelligence control system, comprising:

Module is set, is used to be provided with initial value, the charging valve position of the performance variable of delayed coking unit Based Intelligent Control and state flag bit and blows the threshold value of steam relative quantity, describedly blow the ratio that the steam relative quantity refers to blow steam flow and feed rate;

Obtain judge module, be used for obtaining current inlet valve place value and the current steam relative quantity that blows, judge the processing step that current need carry out according to described current inlet valve place value and the current steam relative quantity that blows by Distributed Control System (DCS);

Adjusting module is used for according to described processing step described performance variable and state flag bit being adjusted accordingly, and returns the described judge module that obtains after adjustment is finished.

Wherein, the described judge module that obtains comprises: display module, be used for after judging the processing step that current need carry out, and the processing step that described current need are carried out shows.

(3) beneficial effect

The present invention has realized the intelligent compensation control of delayed coking unit, has solved to switch the technical matters that the processing of disturbing is single, can't realize can't being optimized in intelligentized effective inhibition and the handoff procedure control.

Description of drawings

Fig. 1 is the process flow diagram according to the delayed coking unit intelligence control method of one embodiment of the present invention;

Fig. 2 is the regional distribution chart that is used to carry out non-linear liquid level control according to one embodiment of the present invention;

Fig. 3 is the structured flowchart according to the delayed coking unit intelligence control system of one embodiment of the present invention.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.

The present invention is on the basis of understanding delay coking process device and operating process in depth, extract of the influence of each stages operating of delayed coking unit by analyzing on-the-spot real data to whole process of production, and execute-in-place slip-stick artist's practical experience summarized and conclude, finally set up preheating, cut tower, the expert system of Action Events to main fractionating tower column bottom temperature and liquid level influence such as steam out for a short time, then use the thought of feedforward control to realize to switching the inhibition of disturbance, and at the characteristic of delayed coking periodical operation, introduce the rolling of iterative learning thought and seek optimum feedforward compensation amount, thereby effectively reduce the flow of operation such as delayed coking coke drum switching for downstream main fractionating tower charging, heat, the disturbance of aspects such as component, final realization quiet run guarantees the requirement of main fractionating tower product quality.

Expert system (Expert System, ES) be to use the computer system of setting up based on the Programming Methodology of knowledge, its comprehensive integration expert's the knowledge and experience in certain field, can as the human expert, use these knowledge, by the process that reasoning simulating human expert makes decision, solve the challenge that the human expert could solve.The operation of delayed coking unit comparatively depends on operating experience, especially blocked operation, therefore, can extract the influence of blocked operation by analyzing means such as real data to whole process of production, and site operation people's practical experience summarized and conclude, finally set up expert knowledge library and inference machine, finish real-time monitoring and compensation control the delayed coking production run.

Iterative learning (Iterative Learning, IL) control thought is suitable for the controlled device that certain has repeating motion character, utilize previous control experience of system and output error to revise current control action, make system's output converge on expectation value as far as possible.It has Model free control mechanism, characteristics such as studying convergence speed is fast, adaptive faculty is strong, algorithm is succinct, easy-to-use through engineering approaches based on memory.

Fig. 1 is according to the process flow diagram of the delayed coking unit intelligence control method of one embodiment of the present invention, may further comprise the steps:

S1: initial value, the charging valve position of the performance variable of delayed coking unit Based Intelligent Control and state flag bit is set and blows the threshold value of steam relative quantity, the described steam relative quantity that blows is the ratio that blows steam flow and heating furnace combined feed flow, and described performance variable comprises: the main fractionating tower feed rate, go up and to return the tower flow under feed rate, stage casing circular flow, the wax slop and flow is followed on the top; Described state flag bit comprises: preheating zone bit, little air blowing zone bit and the zone bit of blowing greatly; The threshold value of described charging valve position comprises: nominal situation valve position threshold value, pressure testing valve position threshold value, preheating valve position threshold value, preheating subordinate phase valve position threshold value, preheating phase III valve position threshold value, little air blowing valve position threshold value and the valve position threshold value of blowing greatly; The described threshold value that blows the steam relative quantity comprises: nominal situation blows steam relative quantity threshold value, pressure testing and blows steam relative quantity upper limit threshold, pressure testing and blow steam relative quantity lower threshold, preheating and blow steam relative quantity threshold value, preheating subordinate phase and blow steam relative quantity threshold value, preheating phase III and blow that steam relative quantity threshold value, little air blowing blow steam relative quantity lower threshold, little air blowing blows steam relative quantity upper limit threshold and blows steam relative quantity threshold value greatly.

S2: obtain current inlet valve place value and the current steam relative quantity that blows by Distributed Control System (DCS), judge the processing step that current need carry out, specifically may further comprise the steps according to described current inlet valve place value and the current steam relative quantity that blows:

S201: inlet valve place value (unit is % in the present embodiment) and the current steam relative quantity that blows of obtaining the inlet valve place value (unit is % in the present embodiment) of current first coke drum, current second coke drum by Distributed Control System (DCS);

S202: judge whether to enter " nominal situation " processing step according to following logical relation (1),

[(V ₁+V ₂)≤CV ₂]&(F _steam≤CF ₂) (1)

Wherein, V ₁Be the inlet valve place value of described current first coke drum, V ₂Be the inlet valve place value of described current second coke drum, F _SteamBe described current steam relative quantity, the CV of blowing ₂For described nominal situation valve position threshold value (in the present embodiment, CV ₂Scope be 100～110, unit is %), CF ₂For described nominal situation blow steam relative quantity threshold value (in the present embodiment, CF ₂Scope be 0～0.05, unit is %) ， ﹠amp; Presentation logic with;

If the logic determines result of logical relation (1) is true, then be judged to be and enter " nominal situation " processing step, and execution in step S3, if the logic determines result is vacation, then execution in step S203;

S203: judge whether to enter " pressure testing " processing step according to following logical relation (2),

[(V ₁+V ₂)≤CV ₃]&(CF ₃₁≤F _steam≤CF ₃₂) (2)

Wherein, CV ₃For described pressure testing valve position threshold value (in the present embodiment, CV ₃Scope be 100～110, unit is %), CF ₃₁For described pressure testing blow steam relative quantity lower threshold (in the present embodiment, CF ₃₁Scope be 0.4～0.5, unit is %), CF ₃₂For described pressure testing blow steam relative quantity upper limit threshold (in the present embodiment, CF ₃₂Scope be 5～7, unit is %);

If the logic determines result of logical relation (2) be true, then be judged to be and enter " pressure testing " processing step, and execution in step S3, if the logic determines result is vacation, execution in step S204 then,

S204: judge whether to enter " preheating " processing step according to following logical relation (3),

[(V ₁+V ₂)≥CV ₄]&(F _steam≤CF ₄) (3)

Wherein, CV ₄For described preheating valve position threshold value (in the present embodiment, CV ₄Scope be 100～110, unit is %), CF ₄For described preheating blow steam relative quantity threshold value (in the present embodiment, CF ₄Scope be 0～0.5, unit is %);

If the logic determines result of logical relation (3) is true, then be judged to be and enter " preheating " processing step, and execution in step S205, if the logic determines result is false, execution in step S208 then, described " preheating " processing step comprises: " preheating begins " and " preheating preparation " technology substep;

S205: judge whether to enter " preheating begins " technology substep according to described preheating zone bit, if described preheating zone bit is true, then be judged to be and enter " preheating begins " technology substep, and execution in step S206, if described preheating zone bit is false, then be judged to be and enter " preheating preparation " technology substep, and execution in step S3, described " preheating begins " technology substep further comprises: " preheating phase one ", " preheating subordinate phase " and " preheating phase III " technology substep;

S206: judge whether to enter " preheating phase one " technology substep according to following logical relation (4),

(V ₁+V ₂)≥CV ₆ (4)

Wherein, CV ₆For described preheating subordinate phase valve position threshold value (in the present embodiment, CV ₆Scope be 130～150, unit is %);

If the logic determines result of logical relation (4) be false, then be judged to be and enter " preheating phase one " technology substep, and execution in step S3, if the logic determines result is very, execution in step S207 then;

S207: judge whether to enter " preheating subordinate phase " technology substep according to following logical relation (5),

(V ₁+V ₂)≥CV ₇ (5)

Wherein, CV ₇For preheating phase III valve position threshold value (in the present embodiment, CV ₇Scope be 195～200, unit is %);

If the logic determines result of logical relation (5) is false, then be judged to be and enter " preheating subordinate phase " technology substep, and execution in step S3, if the logic determines result is true, then is judged to be and enters " preheating phase III " technology substep, and execution in step S3;

S208: judge whether to enter " little air blowing " processing step according to following logical relation (6),

[(V ₁+V ₂)≥CV ₈]&(CF ₈₁≤F _steam≤CF ₈₂) (6)

Wherein, CV ₈For little air blowing valve position threshold value (in the present embodiment, CV ₈Scope be 195～200, unit is %), CF ₈₁For little air blowing blow steam relative quantity lower threshold (in the present embodiment, CF ₈₁Scope be 0.4～0.5, unit is %), CF ₈₂For little air blowing blow steam relative quantity upper limit threshold (in the present embodiment, CF ₈₂Scope be 4～5, unit is %);

If the logic determines result of logical relation (6) is true, then be judged to be and enter " little air blowing " processing step, and execution in step S209, if the logic determines result is false, execution in step S210 then, described " little air blowing " processing step comprises: " little air blowing begins " and " little air blowing preparation " technology substep;

S209: judge whether to enter " little air blowing begins " technology substep according to described little air blowing zone bit, if described preheating zone bit is true, then be judged to be and enter " little air blowing begins " technology substep, and execution in step S3, if described preheating zone bit is false, then be judged to be and enter " little air blowing preparation " technology substep, and execution in step S3;

S210: judge whether to enter " the big air blowing " processing step according to following logical relation (7),

[(V ₁+V ₂)≤CV ₁₀]&(F _steam≥CF ₁₀) (7)

Wherein, CV ₁₀For big air blowing valve position threshold value (in the present embodiment, CV ₁₀Scope be 100～110, unit is %), CF ₁₀For blow greatly steam relative quantity threshold value (in the present embodiment, CF ₁₀Scope be 4～5, unit is %);

If the logic determines result of logical relation (7) is true, then be judged to be and enter " the big air blowing " processing step, and execution in step S211, if the logic determines result is false, then be judged to be and enter " normal operation " processing step, and execution in step S3, described " the big air blowing " processing step comprises: " big air blowing begins " and " the big preparation of blowing " technology substep;

S211: judge whether to enter " big air blowing begins " technology substep according to described big air blowing zone bit, if described preheating zone bit is true, then be judged to be and enter " big air blowing begins " technology substep, and execution in step S3, if described preheating zone bit is false, then be judged to be and enter " the big preparation of blowing " technology substep, and execution in step S3.

S3: according to described processing step described performance variable and state flag bit are adjusted accordingly, return step S2 after adjustment is finished, step S3 specifically comprises:

If enter " nominal situation " processing step, then described preheating zone bit, little air blowing zone bit and the zone bit assignment of blowing greatly are vacation, described main fractionating tower feed rate is not carried out non-linear liquid level control;

If enter " pressure testing " processing step, then described preheating zone bit, little air blowing zone bit and the zone bit assignment of blowing greatly are vacation, described main fractionating tower liquid level is not carried out non-linear liquid level control;

If enter " preheating preparation " the technology substep in " preheating " processing step, then be true with described preheating zone bit assignment, be false with described little air blowing zone bit and big air blowing zone bit assignment, and described main fractionating tower liquid level is carried out non-linear liquid level control;

If enter " preheating begins " technology substep in " preheating " processing step, and be in " preheating phase one " technology substep in " preheating begins " technology substep, be true then with described preheating zone bit assignment, with described little air blowing zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control;

If enter " preheating begins " technology substep in " preheating " processing step, and be in " preheating subordinate phase " technology substep in " preheating begins " technology substep, be true then with described preheating zone bit assignment, with described little air blowing zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control, according to described first adjustment amount of going up feed rate the described feed rate of going up is adjusted, first adjustment amount according to described stage casing circular flow is adjusted described stage casing circular flow, adjust returning the tower flow under the described wax slop according to first adjustment amount that returns the tower flow under the described wax slop, first adjustment amount that follows flow according to described top follows flow adjustment to described top, described first adjustment amount is the described feed rate of going up, the stage casing circular flow, return tower flow and top under the wax slop and follow in the flow one default number percent, in the present embodiment, the unit of all adjustment amounts is %, on the occasion of being rise, negative value is downward modulation, the described initial value scope that goes up first adjustment amount of feed rate is-5～-1, the initial value scope of first adjustment amount of described stage casing circular flow is-10～-3, the initial value scope of returning first adjustment amount of tower flow under the described wax slop is 1～5, and the initial value scope that first adjustment amount of flow is followed on described top is 0～1;

If enter " preheating begins " technology substep in " preheating " processing step, and be in " preheating phase III " technology substep in " preheating begins " technology substep, be true then with described preheating zone bit assignment, with described little air blowing zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control, according to described second adjustment amount of going up feed rate the described feed rate of going up is adjusted, second adjustment amount according to described stage casing circular flow is adjusted described stage casing circular flow, adjust returning the tower flow under the described wax slop according to second adjustment amount that returns the tower flow under the described wax slop, second adjustment amount that follows flow according to described top follows flow adjustment to described top, described second adjustment amount is the described feed rate of going up, the stage casing circular flow, return tower flow and top under the wax slop and follow in the flow one default number percent, in the present embodiment, the described initial value scope that goes up second adjustment amount of feed rate is-10～-2, the initial value scope of second adjustment amount of described stage casing circular flow is-15～-6, the initial value scope of returning second adjustment amount of tower flow under the described wax slop is 2～10, and the initial value scope that second adjustment amount of flow is followed on described top is 0～2;

If enter " little air blowing preparation " the technology substep in " little air blowing " processing step, be true then with described little air blowing zone bit assignment, with described preheating zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control;

If enter " little air blowing begins " the technology substep in " little air blowing " processing step, be true then with described little air blowing zone bit assignment, with described preheating zone bit and big air blowing zone bit assignment is false, and described main fractionating tower feed rate is carried out non-linear liquid level control, according to described the 3rd adjustment amount of going up feed rate the described feed rate of going up is adjusted, the 3rd adjustment amount according to described stage casing circular flow is adjusted described stage casing circular flow, adjust returning the tower flow under the described wax slop according to the 3rd adjustment amount that returns the tower flow under the described wax slop, the 3rd adjustment amount that follows flow according to described top follows flow adjustment to described top, described the 3rd adjustment amount is the described feed rate of going up, the stage casing circular flow, return tower flow and top under the wax slop and follow in the flow one default number percent, in the present embodiment, the described initial value scope that goes up the 3rd adjustment amount of feed rate is 10～15, the initial value scope of the 3rd adjustment amount of described stage casing circular flow is 0～1, the initial value scope of returning the 3rd adjustment amount of tower flow under the described wax slop is 3～10, and the initial value scope that the 3rd adjustment amount of flow is followed on described top is 30～70;

If enter " the big preparation of blowing " the technology substep in " the big air blowing " processing step, be true then with described big air blowing zone bit assignment, with described preheating zone bit and little air blowing zone bit assignment is false, described main fractionating tower feed rate is not carried out non-linear liquid level control, according to the main fractionating tower column bottom temperature by interative computation to the described feed rate of going up, the stage casing circular flow, returning the tower flow under the wax slop adjusts respectively with each adjustment amount that flow is followed on the top, in the process that described adjustment amount is adjusted respectively, comprise first adjustment amount, second adjustment amount and the 3rd adjustment amount are adjusted respectively;

If enter " big air blowing begins " the technology substep in " the big air blowing " processing step, then described big air blowing zone bit assignment is true, with described preheating zone bit and little air blowing zone bit assignment is false, and described main fractionating tower feed rate is not carried out non-linear liquid level control.

Wherein, described non-linear liquid level control specifically may further comprise the steps:

S301: read level value at the bottom of the main fractionating tower tower by described Distributed Control System (DCS), and calculate liquid level change speed at the bottom of the main fractionating tower tower according to following relationship formula (8),

VelLevel(k)＝Level(k)-Level(k-1) (8)

Wherein, k is current control cycle (in the present embodiment, control cycle is 2～10 seconds), and VelLevel (k) is a liquid level change speed at the bottom of the current main fractionating tower tower, and Level (k) is a level value at the bottom of the current main fractionating tower tower;

S302: judge the present located zone by level value at the bottom of the described main fractionating tower tower, as shown in Figure 2, be divided into following five kinds of situations:

One,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if the current inner region that is in:

Liquid level change speed at the bottom of the main fractionating tower tower greater than zero situation under, if satisfy following relationship formula (9), then reduce described main fractionating tower feed rate,

Level(k+T _NLC)＞HL (9)

If satisfy following relationship formula (10), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)≤HL (10)

Under the minus situation of liquid level change speed at the bottom of the main fractionating tower tower, if satisfy following relationship formula (11), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)≥LL (11)

If satisfy following relationship formula (12), then raise described main fractionating tower feed rate,

Level(k+T _NLC)＜LL (12)

Under the null situation of liquid level change speed at the bottom of the main fractionating tower tower, then described main fractionating tower feed rate is not regulated.

Two,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if the current exterior domain that is in:

Liquid level change speed at the bottom of the main fractionating tower tower more than or equal to zero situation under, then reduce described main fractionating tower feed rate;

Under the minus situation of liquid level change speed at the bottom of the main fractionating tower tower, then described main fractionating tower feed rate is not regulated;

Three,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if the current down exterior domain that is in:

Liquid level change speed at the bottom of the main fractionating tower tower greater than zero situation under, then described main fractionating tower feed rate is not regulated;

Liquid level change speed at the bottom of the main fractionating tower tower smaller or equal to zero situation under, then raise described main fractionating tower feed rate;

Four,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if current being in greater than outer upper limit zone:

Liquid level change speed at the bottom of the main fractionating tower tower more than or equal to zero situation under, then reduce described main fractionating tower feed rate;

Under the minus situation of liquid level change speed at the bottom of the main fractionating tower tower, if satisfy following relationship formula (13), then reduce described main fractionating tower feed rate,

Level(k+T _NLC)≥UpBd (13)

If satisfy following relationship formula (14), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)＜UpBd (14)

Five,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if current being in less than outer lower limit region:

Liquid level change speed at the bottom of the main fractionating tower tower smaller or equal to zero situation under, then raise described main fractionating tower feed rate;

Liquid level change speed at the bottom of the main fractionating tower tower greater than zero situation under, if satisfy following relationship formula (15), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)＞LowBd (15)

If satisfy following relationship formula (16), then raise described main fractionating tower feed rate

Level(k+T _NLC)≤LowBd (16)

In described relational expression (9)～(16), Level (k+T _NLC)=Level (k)+VelLevel (k) * T _NLC, k is current control cycle, and VelLevel (k) is a liquid level change speed at the bottom of the current main fractionating tower tower, and Level (k) is a level value at the bottom of the current main fractionating tower tower, T _NLCBe the prediction step of liquid level change, HL is the outer upper limit of default liquid level, and LL is the upper bound in the default liquid level for the outer lower limit of default liquid level, UpBd, and LowBd is lower bound in the default liquid level.

Wherein, described interative computation is specially:

By Distributed Control System (DCS) the main fractionating tower column bottom temperature is sampled, according to the variance of following formula (17) calculating main fractionating tower column bottom temperature,

$D{\left(h\right)}^2=\frac{1}{n-1}\underset{i=0}{\overset{n}{\mathrm{\&Sigma;}}}{(T_i-T_{\mathrm{SP}})}^2---\left(17\right)$

Wherein, h is the current iteration learning cycle, and D (h) is the variance of described main fractionating tower column bottom temperature, and n is the sampled point number, T _iBe the temperature of i sampled point at the bottom of the described main fractionating tower tower, T _SPBe described main fractionating tower column bottom temperature setting value;

Calculate converging factor according to following formula (18),

$\mathrm{\&lambda;}\left(h\right)=\exp (-\frac{1}{|D\left(h\right)-D(h-1)|})---\left(18\right)$

Wherein, λ (h) is a converging factor;

Return the variable quantity that each adjustment amount of flow is followed on tower flow and top under feed rate, stage casing circular flow, the wax slop according to described go up that following formula calculates next iterative learning cycle, variable quantity to described adjustment amount carries out in the calculation process, comprise that the variable quantity to first adjustment amount, second adjustment amount and the 3rd adjustment amount calculates respectively

ΔR _MVij(h)＝λ(h){K _P[D(h)-D(h-1)]+K _ID(h)+K _D[D(h)-2D(h-1)+D(h-2)]}

-(19)

Wherein, MVi is an i performance variable, and i=2 returns the tower flow under 3,4,5, the 2～5 performance variables corresponding successively described upward feed rate, stage casing circular flow, the wax slops and flow is followed on the top, R _MVij(h) be j adjustment amount of i performance variable, j=1, the 2,3, the 1st～3 corresponding successively first adjustment amount of adjustment amount, second adjustment amount and the 3rd adjustment amount, Δ R _MVij(h) be the variable quantity of j adjustment amount of i performance variable, K _PBe adjustable ratio gain, K _IBe integration adjustable gain, K _DBe the differential adjustable gain;

Return each adjustment amount that flow is followed on tower flow and top under feed rate, stage casing circular flow, the wax slop according to described go up that following formula (20) calculates next iterative learning cycle,

R _MVij(h+1)＝sgn(R _MVij(h))|ΔR _MVij(h)+|R _MVij(h)|| (20)

Wherein, $\mathrm{sgn}\left(R_{\mathrm{MVij}}\left(h\right)\right)=\left\{\begin{array}{c}+1,R_{\mathrm{MVij}}\left(h\right)>0\\ 0,R_{\mathrm{MVij}}\left(h\right)=0\\ -1,R_{\mathrm{MVij}}\left(h\right)<0\end{array}\right.,$

H+1 is next iterative learning cycle.

In step S2, after judging the processing step that current need carry out, the processing step that described current need are carried out shows.

The present invention also provides a kind of delayed coking unit intelligence control system, as shown in Figure 3, comprising:

Module is set, is used to be provided with initial value, the charging valve position of the performance variable of delayed coking unit Based Intelligent Control and state flag bit and blows the threshold value of steam relative quantity, describedly blow the ratio that the steam relative quantity refers to blow steam flow and feed rate;

Obtain judge module, be used for obtaining current inlet valve place value and the current steam relative quantity that blows, judge the processing step that current need carry out according to described current inlet valve place value and the current steam relative quantity that blows by Distributed Control System (DCS);

Adjusting module is used for according to described processing step described performance variable and state flag bit being adjusted accordingly, and returns the described judge module that obtains after adjustment is finished.

The described judge module that obtains comprises: display module, be used for after judging the processing step that current need carry out, and the processing step that described current need are carried out shows.

Above embodiment only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (9)

1. a delayed coking unit intelligence control method is characterized in that, may further comprise the steps:

S1: initial value, the charging valve position of the performance variable of delayed coking unit Based Intelligent Control and state flag bit is set and blows the threshold value of steam relative quantity, the described steam relative quantity that blows is the ratio that blows steam flow and heating furnace combined feed flow;

S2: obtain current inlet valve place value and the current steam relative quantity that blows by Distributed Control System (DCS), judge the processing step that current need carry out according to described current inlet valve place value and the current steam relative quantity that blows;

S3: according to described processing step described performance variable and state flag bit are adjusted accordingly, return step S2 after adjustment is finished.

2. delayed coking unit intelligence control method as claimed in claim 1 is characterized in that, described performance variable comprises: the main fractionating tower feed rate, go up and to return the tower flow under feed rate, stage casing circular flow, the wax slop and flow is followed on the top; Described state flag bit comprises: preheating zone bit, little air blowing zone bit and the zone bit of blowing greatly; The threshold value of described charging valve position comprises: nominal situation valve position threshold value, pressure testing valve position threshold value, preheating valve position threshold value, preheating subordinate phase valve position threshold value, preheating phase III valve position threshold value, little air blowing valve position threshold value and the valve position threshold value of blowing greatly; The described threshold value that blows the steam relative quantity comprises: nominal situation blows steam relative quantity threshold value, pressure testing and blows steam relative quantity upper limit threshold, pressure testing and blow steam relative quantity lower threshold, preheating and blow steam relative quantity threshold value, preheating subordinate phase and blow steam relative quantity threshold value, preheating phase III and blow that steam relative quantity threshold value, little air blowing blow steam relative quantity lower threshold, little air blowing blows steam relative quantity upper limit threshold and blows steam relative quantity threshold value greatly.

3. delayed coking unit intelligence control method as claimed in claim 2 is characterized in that, described step S2 specifically may further comprise the steps:

S201: inlet valve place value and the current steam relative quantity that blows of obtaining the inlet valve place value of current first coke drum, current second coke drum by Distributed Control System (DCS);

S202: judge whether to enter " nominal situation " processing step according to following logical relation (1),

[(V ₁+V ₂)≤CV ₂]&(F _steam≤CF ₂) (1)

Wherein, V ₁Be the inlet valve place value of described current first coke drum, V ₂Be the inlet valve place value of described current second coke drum, F _SteamBe described current steam relative quantity, the CV of blowing ₂Be described nominal situation valve position threshold value, CF ₂For described nominal situation blows steam relative quantity threshold value; Presentation logic with;

If the logic determines result of logical relation (1) is true, then be judged to be and enter " nominal situation " processing step, and execution in step S3, if the logic determines result is vacation, then execution in step S203;

S203: judge whether to enter " pressure testing " processing step according to following logical relation (2),

[(V ₁+V ₂)≤CV ₃]&(CF ₃₁≤F _steam≤CF ₃₂) (2)

Wherein, CV ₃Be described pressure testing valve position threshold value, CF ₃₁For described pressure testing blows steam relative quantity lower threshold, CF ₃₂For described pressure testing blows steam relative quantity upper limit threshold;

If the logic determines result of logical relation (2) be true, then be judged to be and enter " pressure testing " processing step, and execution in step S3, if the logic determines result is vacation, execution in step S204 then,

S204: judge whether to enter " preheating " processing step according to following logical relation (3),

[(V ₁+V ₂)≥CV ₄]&(F _steam≤CF ₄) (3)

Wherein, CV ₄Be described preheating valve position threshold value, CF ₄For described preheating blows steam relative quantity threshold value;

If the logic determines result of logical relation (3) is true, then be judged to be and enter " preheating " processing step, and execution in step S205, if the logic determines result is false, execution in step S208 then, described " preheating " processing step comprises: " preheating begins " and " preheating preparation " technology substep;

S205: judge whether to enter " preheating begins " technology substep according to described preheating zone bit, if described preheating zone bit is true, then be judged to be and enter " preheating begins " technology substep, and execution in step S206, if described preheating zone bit is false, then be judged to be and enter " preheating preparation " technology substep, and execution in step S3, described " preheating begins " technology substep further comprises: " preheating phase one ", " preheating subordinate phase " and " preheating phase III " technology substep;

S206: judge whether to enter " preheating phase one " technology substep according to following logical relation (4),

(V ₁+V ₂)≥CV ₆ (4)

Wherein, CV ₆Be described preheating subordinate phase valve position threshold value;

If the logic determines result of logical relation (4) be false, then be judged to be and enter " preheating phase one " technology substep, and execution in step S3, if the logic determines result is very, execution in step S207 then;

S207: judge whether to enter " preheating subordinate phase " technology substep according to following logical relation (5),

(V ₁+V ₂)≥CV ₇ (5)

Wherein, CV ₇Be described preheating phase III valve position threshold value;

If the logic determines result of logical relation (5) is false, then be judged to be and enter " preheating subordinate phase " technology substep, and execution in step S3, if the logic determines result is true, then is judged to be and enters " preheating phase III " technology substep, and execution in step S3;

S208: judge whether to enter " little air blowing " processing step according to following logical relation (6),

[(V ₁+V ₂)≥CV ₈]&(CF ₈₁≤F _steam≤CF ₈₂) (6)

Wherein, CV ₈Be little air blowing valve position threshold value, CF ₈₁For little air blowing blows steam relative quantity lower threshold, CF ₈₂For little air blowing blows steam relative quantity upper limit threshold;

If the logic determines result of logical relation (6) is true, then be judged to be and enter " little air blowing " processing step, and execution in step S209, if the logic determines result is false, execution in step S210 then, described " little air blowing " processing step comprises: " little air blowing begins " and " little air blowing preparation " technology substep;

S209: judge whether to enter " little air blowing begins " technology substep according to described little air blowing zone bit, if described preheating zone bit is true, then be judged to be and enter " little air blowing begins " technology substep, and execution in step S3, if described preheating zone bit is false, then be judged to be and enter " little air blowing preparation " technology substep, and execution in step S3;

S210: judge whether to enter " the big air blowing " processing step according to following logical relation (7),

[(V ₁+V ₂)≤CV ₁₀]&(F _steam≥CF ₁₀) (7)

Wherein, CV ₁₀Be big air blowing valve position threshold value, CF ₁₀For blowing steam relative quantity threshold value greatly;

If the logic determines result of logical relation (7) is true, then be judged to be and enter " the big air blowing " processing step, and execution in step S211, if the logic determines result is false, then be judged to be and enter " normal operation " processing step, and execution in step S3, described " the big air blowing " processing step comprises: " big air blowing begins " and " the big preparation of blowing " technology substep;

S211: judge whether to enter " big air blowing begins " technology substep according to described big air blowing zone bit, if described preheating zone bit is true, then be judged to be and enter " big air blowing begins " technology substep, and execution in step S3, if described preheating zone bit is false, then be judged to be and enter " the big preparation of blowing " technology substep, and execution in step S3.

4. delayed coking unit intelligence control method as claimed in claim 3 is characterized in that, described step S3 specifically comprises:

If enter " nominal situation " processing step, then described preheating zone bit, little air blowing zone bit and the zone bit assignment of blowing greatly are vacation, described main fractionating tower liquid level is not carried out non-linear liquid level control;

If enter " pressure testing " processing step, then described preheating zone bit, little air blowing zone bit and the zone bit assignment of blowing greatly are vacation, described main fractionating tower liquid level is not carried out non-linear liquid level control;

If enter " preheating preparation " the technology substep in " preheating " processing step, then be true with described preheating zone bit assignment, be false with described little air blowing zone bit and big air blowing zone bit assignment, and described main fractionating tower liquid level is carried out non-linear liquid level control;

If enter " preheating begins " technology substep in " preheating " processing step, and be in " preheating phase one " technology substep in " preheating begins " technology substep, be true then with described preheating zone bit assignment, with described little air blowing zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control;

If enter " preheating begins " technology substep in " preheating " processing step, and be in " preheating subordinate phase " technology substep in " preheating begins " technology substep, be true then with described preheating zone bit assignment, with described little air blowing zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control, according to described first adjustment amount of going up feed rate the described feed rate of going up is adjusted, first adjustment amount according to described stage casing circular flow is adjusted described stage casing circular flow, adjust returning the tower flow under the described wax slop according to first adjustment amount that returns the tower flow under the described wax slop, first adjustment amount that follows flow according to described top follows flow adjustment to described top, and described first adjustment amount is the described feed rate of going up, the stage casing circular flow, return tower flow and top under the wax slop and follow in the flow one default number percent;

If enter " preheating begins " technology substep in " preheating " processing step, and be in " preheating phase III " technology substep in " preheating begins " technology substep, be true then with described preheating zone bit assignment, with described little air blowing zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control, according to described second adjustment amount of going up feed rate the described feed rate of going up is adjusted, second adjustment amount according to described stage casing circular flow is adjusted described stage casing circular flow, adjust returning the tower flow under the described wax slop according to second adjustment amount that returns the tower flow under the described wax slop, second adjustment amount that follows flow according to described top follows flow adjustment to described top, and described second adjustment amount is the described feed rate of going up, the stage casing circular flow, return tower flow and top under the wax slop and follow in the flow one default number percent;

If enter " little air blowing preparation " the technology substep in " little air blowing " processing step, be true then with described little air blowing zone bit assignment, with described preheating zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control;

If enter " little air blowing begins " the technology substep in " little air blowing " processing step, be true then with described little air blowing zone bit assignment, with described preheating zone bit and big air blowing zone bit assignment is false, and described main fractionating tower liquid level is carried out non-linear liquid level control, according to described the 3rd adjustment amount of going up feed rate the described feed rate of going up is adjusted, the 3rd adjustment amount according to described stage casing circular flow is adjusted described stage casing circular flow, adjust returning the tower flow under the described wax slop according to the 3rd adjustment amount that returns the tower flow under the described wax slop, the 3rd adjustment amount that follows flow according to described top follows flow adjustment to described top, and described the 3rd adjustment amount is the described feed rate of going up, the stage casing circular flow, return tower flow and top under the wax slop and follow in the flow one default number percent;

If enter " the big preparation of blowing " the technology substep in " the big air blowing " processing step, be true then with described big air blowing zone bit assignment, with described preheating zone bit and little air blowing zone bit assignment is false, described main fractionating tower liquid level is not carried out non-linear liquid level control, pass through the iterative learning computing to the described feed rate of going up according to the main fractionating tower column bottom temperature, the stage casing circular flow, returning the tower flow under the wax slop adjusts respectively with each adjustment amount that flow is followed on the top, in the process that described adjustment amount is adjusted respectively, comprise first adjustment amount, second adjustment amount and the 3rd adjustment amount are adjusted respectively;

If enter " big air blowing begins " the technology substep in " the big air blowing " processing step, then described big air blowing zone bit assignment is true, with described preheating zone bit and little air blowing zone bit assignment is false, and described main fractionating tower liquid level is not carried out non-linear liquid level control.

5. delayed coking unit intelligence control method as claimed in claim 4 is characterized in that, described non-linear liquid level control specifically may further comprise the steps:

S301: read level value at the bottom of the main fractionating tower tower by described Distributed Control System (DCS), calculate liquid level change speed at the bottom of the main fractionating tower tower according to following relationship formula (8),

VelLevel(k)＝Level(k)-Level(k-1) (8)

Wherein, k is current control cycle, and VelLevel (k) is a liquid level change speed at the bottom of the current main fractionating tower tower, and Level (k) is a level value at the bottom of the current main fractionating tower tower;

S302: judge the present located zone by level value at the bottom of the described main fractionating tower tower, be divided into following five kinds of situations:

One,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if the current inner region that is in:

Liquid level change speed at the bottom of the main fractionating tower tower greater than zero situation under, if satisfy following relationship formula (9), then reduce described main fractionating tower feed rate,

Level(k+T _NLC)＞HL (9)

If satisfy following relationship formula (10), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)≤HL (10)

Under the minus situation of liquid level change speed at the bottom of the main fractionating tower tower, if satisfy following relationship formula (11), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)≥LL (11)

If satisfy following relationship formula (12), then raise described main fractionating tower feed rate,

Level(k+T _NLC)＜LL (12)

Under the null situation of liquid level change speed at the bottom of the main fractionating tower tower, then described main fractionating tower feed rate is not regulated.

Two,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if the current exterior domain that is in:

Liquid level change speed at the bottom of the main fractionating tower tower more than or equal to zero situation under, then reduce described main fractionating tower feed rate;

Under the minus situation of liquid level change speed at the bottom of the main fractionating tower tower, then described main fractionating tower feed rate is not regulated;

Three,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if the current down exterior domain that is in:

Liquid level change speed at the bottom of the main fractionating tower tower greater than zero situation under, then described main fractionating tower feed rate is not regulated;

Liquid level change speed at the bottom of the main fractionating tower tower smaller or equal to zero situation under, then raise described main fractionating tower feed rate;

Four,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if current being in greater than outer upper limit zone:

Liquid level change speed at the bottom of the main fractionating tower tower more than or equal to zero situation under, then reduce described main fractionating tower feed rate;

Under the minus situation of liquid level change speed at the bottom of the main fractionating tower tower, if satisfy following relationship formula (13), then reduce described main fractionating tower feed rate,

Level(k+T _NLC)≥UpBd (13)

If satisfy following relationship formula (14), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)＜UpBd (14)

Five,, then judge whether that according to liquid level change speed at the bottom of the described current main fractionating tower tower needs regulate described main fractionating tower feed rate if current being in less than outer lower limit region:

Liquid level change speed at the bottom of the main fractionating tower tower smaller or equal to zero situation under, then raise described main fractionating tower feed rate;

Liquid level change speed at the bottom of the main fractionating tower tower greater than zero situation under, if satisfy following relationship formula (15), then described main fractionating tower feed rate is not regulated,

Level(k+T _NLC)＞LowBd (15)

If satisfy following relationship formula (16), then raise described main fractionating tower feed rate

Level(k+T _NLC)≤LowBd (16)

In described relational expression (9)～(16), Level (k+T _NLC)=Level (k)+VelLevel (k) * T _NLC, T _NLCBe the prediction step of liquid level change, HL is the outer upper limit of default liquid level, and LL is the upper bound in the default liquid level for the outer lower limit of default liquid level, UpBd, and LowBd is lower bound in the default liquid level.

6. delayed coking unit intelligence control method as claimed in claim 4 is characterized in that, described interative computation is specially:

By Distributed Control System (DCS) the main fractionating tower column bottom temperature is sampled, according to the variance of following formula (17) calculating main fractionating tower column bottom temperature,

$D{\left(h\right)}^2=\frac{1}{n-1}\underset{i=0}{\overset{n}{\mathrm{\&Sigma;}}}{(T_i-T_{\mathrm{SP}})}^2---\left(17\right)$

Wherein, h is the current iteration learning cycle, and D (h) is the variance of described main fractionating tower column bottom temperature, and n is the sampled point number, T _iBe the temperature of i sampled point at the bottom of the described main fractionating tower tower, T _SPBe described main fractionating tower column bottom temperature setting value;

Calculate converging factor according to following formula (18),

$\mathrm{\&lambda;}\left(h\right)=\exp (-\frac{1}{|D\left(h\right)-D(h-1)|})---\left(18\right)$

Wherein, λ (h) is a converging factor;

Return the variable quantity that each adjustment amount of flow is followed on tower flow and top under feed rate, stage casing circular flow, the wax slop according to described go up that following formula (19) calculates next iterative learning cycle, variable quantity to described adjustment amount carries out in the calculation process, comprise that the variable quantity to first adjustment amount, second adjustment amount and the 3rd adjustment amount calculates respectively

ΔR _MVij(h)＝λ(h){K _P[D(h)-D(h-1)]+K _ID(h)+K _D[D(h)-2D(h-1)+D(h-2)]}

-(19)

Wherein, MVi is an i performance variable, and i=2 returns the tower flow under 3,4,5, the 2～5 performance variables corresponding successively described upward feed rate, stage casing circular flow, the wax slops and flow is followed on the top, R _MVij(h) be j adjustment amount of i performance variable, j=1, the 2,3, the 1st～3 corresponding successively first adjustment amount of adjustment amount, second adjustment amount and the 3rd adjustment amount, Δ R _MVij(h) be the variable quantity of j adjustment amount of i performance variable, K _PBe adjustable ratio gain, K _IBe integration adjustable gain, K _DBe the differential adjustable gain;

Return each adjustment amount that flow is followed on tower flow and top under feed rate, stage casing circular flow, the wax slop according to described go up that following formula (20) calculates next iterative learning cycle,

R _MVij(h+1)＝sgn(R _MVij(h))|ΔR _MVij(h)+|R _MVij(h)|| (20)

Wherein, $\mathrm{sgn}\left(R_{\mathrm{MVij}}\left(h\right)\right)=\left\{\begin{array}{c}+1,R_{\mathrm{MVij}}\left(h\right)>0\\ 0,R_{\mathrm{MVij}}\left(h\right)=0\\ -1,R_{\mathrm{MVij}}\left(h\right)<0\end{array}\right.,$

H+1 is next iterative learning cycle.

7. as each described delayed coking unit intelligence control method of claim 1-6, it is characterized in that in step S2, after judging the processing step that current need carry out, the processing step that described current need are carried out shows.

8. a delayed coking unit intelligence control system is characterized in that, comprising:

Module is set, is used to be provided with initial value, the charging valve position of the performance variable of delayed coking unit Based Intelligent Control and state flag bit and blows the threshold value of steam relative quantity, describedly blow the ratio that the steam relative quantity refers to blow steam flow and feed rate;

Obtain judge module, be used for obtaining current inlet valve place value and the current steam relative quantity that blows, judge the processing step that current need carry out according to described current inlet valve place value and the current steam relative quantity that blows by Distributed Control System (DCS);

Adjusting module is used for according to described processing step described performance variable and state flag bit being adjusted accordingly, and returns the described judge module that obtains after adjustment is finished.

9. delayed coking unit intelligence control system as claimed in claim 8 is characterized in that, the described judge module that obtains comprises: display module, be used for after judging the processing step that current need carry out, and the processing step that described current need are carried out shows.

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