CN102915006A - Method for offline analyzing and online scheduling of byproduct gas of metallurgy industry - Google Patents
Method for offline analyzing and online scheduling of byproduct gas of metallurgy industry Download PDFInfo
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- CN102915006A CN102915006A CN201210335663XA CN201210335663A CN102915006A CN 102915006 A CN102915006 A CN 102915006A CN 201210335663X A CN201210335663X A CN 201210335663XA CN 201210335663 A CN201210335663 A CN 201210335663A CN 102915006 A CN102915006 A CN 102915006A
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Abstract
The invention relates to a method for offline analyzing and online scheduling of byproduct gas of a metallurgy industry. A data collection server is connected with a gas producing and marketing project control system and can be used for carrying out the online scheduling on a byproduct gas supply and demand system of the metallurgy industry according to data provided by a system through a pipe network mathematical model, a gas supply and demand system prediction model and a gas supply and demand system optimal scheduling model. According to the method for the offline analyzing and the online scheduling of the byproduct gas of the metallurgy industry, the production rates of energy devices of iron and steel enterprises are greatly increased, and the condition that gas appliances work under a design load can be ensured, so that the operation efficiencies of the gas appliances are improved; the gas spreading can be effectively reduced, a secondary gas energy resource can be adequately adopted, and the reasonable operation of the producing economy can be guaranteed; the predicting and processing schemes can be timely, quickly and precisely made, and the influence caused by faults can be controlled at a lowest limit; the scheduling theory basis can be provided for a scheduler, the subjective blindness of the scheduling can be reduced, and a scheduling command can be timely and accurately issued; and important data parameters for leaderships to make decision to straighten the production of the iron and steel enterprises.
Description
Technical field
The invention belongs to iron and steel enterprise's by-product gas applied technical field, be particularly related to a kind of smelter by-product gas off-line analysis on-line scheduling method, can carry out analysis-by-synthesis to the production and marketing process of three kinds of main by-product gas of iron and steel enterprise, be used for realization to the on-line optimizing scheduling of iron and steel enterprise's by-product gas.
Background technology
Along with the rapid growth of steel and iron industry, its industry as high flow rate, high pollution " rich and influential family ", energy resource consumption constraint obviously manifests, and the energy availability and demand contradiction makes steel and iron industry bear huge pressure at antifouling reduction of discharging, the aspect such as energy-saving and cost-reducing.At present, Iron and Steel Enterprises in China ubiquity by-product gas utilization factor is low, diffuse the problems such as (release that does not utilize) amount is large, both caused great by-product gas energy dissipation and environmental pollution, increased again production cost.For integrated iron and steel works, the reasonable utilization of by-product gas resource and planning directly have influence on sustainable development and the competitiveness of enterprise, only give the attention of height and scientific and reasonable planning, could adapt to each operation production compactedness of iron and steel enterprise, successional characteristics.Blast furnace gas (BFG), coke-oven gas (COG), coal gas of converter (LDG) all are the by-product gas of iron and steel enterprise, are its most important secondary energy.At present, the scheduling of most of iron and steel enterprise by-product gas all relies on artificial experience, does not set up Forecasting Methodology or the system of science, causes the science comprehensively and not to the by-product gas demand forecast.The target of coal gas Optimized Operation is to reach the optimization that the balance of by-product gas and gas allocation utilize, namely ensure safety in production and prerequisite that energy stabilizing is supplied with under, taken full advantage of by-product gas, improve comprehensive utilization rate of energy source.Therefore, the coal gas situation of multianalysis iron and steel enterprise, science are formulated the balance dispatchmeasure between the by-product gas supply and demand, to the production of development iron and steel, reduce energy resource consumption and improve environment important meaning is arranged.
At present, production and marketing Optimized Operation applied research major part for iron and steel enterprise's by-product gas all concentrates on single devices or the static balancing both at home and abroad, have that by-product gas is dispersed in a large number, single devices underrun, data can't quantize, work load is large, the problems such as the artificial interference factor is many are implemented in scheduling, despatching work lacks systematicness, promptness, has limited the optimization utilization of by-product gas.
At present smelter does not also possess by-product gas Automatic dispatching function, and the scheduling of by-product gas is the experience by dispatcher and operating personnel and to being familiar with and degree of understanding of system mainly, carries out artificial empirical decision making.Because the personal experience is familiar with the different production systems that cause coal gas can not well adapt to continuous variation in scheduling process with producing, and often can not arrive best dispatching effect, can not make process system operate in best load condition; Because energy medium production relates to a plurality of production processes, and variable and safe limit factor are many, reaction has certain hysteresis quality on the other hand.By analyzing by-product gas scheduling present situation, Main Problems comprises at present:
(1) part continuous data out of true: the most of measuring instrument accurate measurement of smelter, but along with the carrying out that produces, because the instrumentation environment badly reaches operating personnel and safeguards not in place, cause the inaccurate even damage of part metering instrument, seriously limited measuring accuracy, for the Optimized Operation of by-product gas brings great difficulty.
(2) power dispatcher task is loaded down with trivial details: the by-product gas dispatcher needs to consult, monitor a large amount of production datas every day, carry out the analytic induction of data, reach when by-product gas uses distribution objection to occur when fluctuation occurring, need to carry out both sides' coordination and wait for written instruction of leader, this has just caused, and dispatcher's working load is large, task is loaded down with trivial details.
(3) artificial interference factor is many: because by-product gas itself has certain value as energy medium, need in actual use to adjust energy cost, causing second-class enterprise all to wish to optimize in the situation that does not affect production uses, but second-class enterprise often stands in the individual position to be considered, ignores overall interests.And in actual schedule, do not have good theoretical foundation, and just cause experience to be distributed and privilege is distributed the appearance of phenomenon, each subunits is conditioned each other dispute over trifles, that coal gas uses is not objective, science not.
(4) scheduling can't quantize: because the undulatory property that by-product gas is produced, the dispatcher carries out the balance scheduling by rule of thumb, and therefore, the by-product gas user can't learn method and the transient data in the balance scheduling process.Secondary by-product gas user can only see a month day cumulative data in moon balance form, this is just so that the balance that the coal gas user can not in time grasp every day scheduling trend and comparative analysis balance scheduling result, and it is poor to have caused the balance scheduling result to quantize property.
Summary of the invention
A kind of smelter by-product gas off-line analysis on-line scheduling method that the present invention be directed to the problems referred to above and propose is carried out analysis-by-synthesis to the production and marketing process of three kinds of main by-product gas of iron and steel enterprise, realizes the on-line optimizing scheduling to iron and steel enterprise's by-product gas.
Technical scheme of the present invention is: a kind of smelter by-product gas off-line analysis on-line scheduling method, comprise the by-product gas supply and demand system that is formed by by-product gas output equipment and coal gas use equipment, the smelter by-product gas production and marketing project management system that is formed by terminal and management server, described by-product gas production and marketing project management system is according to the turnaround plan of by-product gas supply and demand system, the production schedule, by-product gas consumes account of the history and by-product gas supply situation establishment by-product gas supply and demand plan sheet and sends the scheduling production ordering, and by-product gas output equipment provides needed by-product gas resource to by-product gas use equipment; A data collection server is connected with described by-product gas production and marketing project management system, described method further is: described data collection server is passed through the pipe network mathematical model according to the by-product gas supply and demand plan sheet that described smelter by-product gas production and marketing project management system provides with scheduling production ordering and by-product gas resource data, by-product gas supply and demand system forecast model and by-product gas supply and demand system Optimal Operation Model, carry out the by-product gas supply and demand, the comparison of actual consumption and plan, analyze and to mark, and with form, chart, the statistical of curve shows, and realizes the optimization on-line scheduling of smelter by-product gas supply and demand system;
Described pipe network mathematical model is: the by-product gas supply and demand plan sheet that at first provides according to smelter by-product gas production and marketing project management system, scheduling production ordering and by-product gas resource, that sets up piping network can flow Transport Model, obtain that by-product gas transports and the pressure that causes and the variation of temperature in pipe network, provide the predicted value of by-product gas pressurizing point top hole pressure, ensure the pressure coupling of Gas Resource both sides of supply and demand; For by-product gas provides constraint condition on the transport capability in ducted scheduling, guarantee that scheduling scheme is effectively carried out simultaneously;
Described by-product gas supply and demand system forecast model is: according to the ruuning situation of described by-product gas supply and demand system, carry out the analytical calculation of the by-product gas energy, prediction and EQUILIBRIUM CALCULATION FOR PROCESS take the network node of the intermediate buffering of the by-product gas energy and by-product gas energy terminal point as the by-product gas resource provide foundation; According to dynamic factor, the impact of fluctuating factor situation on consuming with energy equipment by-product gas product, formulate the dynamic prediction scheme of energy device prediction simultaneously, by-product gas supply and demand system forecast function is accurate under the assurance current intelligence;
Described by-product gas supply and demand system Optimal Operation Model is: according to the scheduling foundation of by-product gas supply and demand system under different operating modes, set up respectively with by-product gas and diffuse minimum and Income Maximum that by-product gas uses as the Optimal Operation Model of target.
Further, the described Transport Model that can flow comprises that by-product gas generation systems, by-product gas stocking system, by-product gas mix pressurization security system and by-product gas user;
Described by-product gas generation systems is comprised of blast furnace by-product gas, converter by-product gas and coke oven by-product gas;
Described by-product gas stocking system is become by blast furnace by-product gas cabinet, converter by-product gas cabinet and coke oven by-product gas group;
Described by-product gas mixes the pressurization security system and is comprised of by-product gas diffusion system, by-product gas commingled system and by-product gas compression system;
Described by-product gas user comprises sintering circuit, coking process, Iron-smelting, steel making working procedure, steel rolling process, generating operation and aided process;
Form the first blast furnace by-product gas pipe network between blast furnace by-product gas and the blast furnace by-product gas cabinet, form the first converter by-product gas pipe network between converter by-product gas and the converter by-product gas cabinet, form the first coke oven by-product gas pipe network between coke oven by-product gas and the coke oven by-product gas cabinet; Blast furnace by-product gas cabinet and by-product gas mix formation the second blast furnace by-product gas pipe network between the pressurization security system, form the second converter by-product gas pipe network between converter by-product gas cabinet and the by-product gas mixing pressurization security system; Coke oven by-product gas cabinet and by-product gas mix formation the second coke oven by-product gas pipe network between the pressurization security system; Described by-product gas mixes formation by-product gas user pipe network between pressurization security system and the coal gas user.
Further, described by-product gas provides the constraint condition on the transport capability to be in ducted scheduling:
By-product gas production and marketing overall balance constraint condition, i.e. no matter how balance scheduling of by-product gas, its total amount is constant;
By-product gas production and marketing changeable type unit constraint condition requires namely transformable gas proportion to satisfy to add that heat request, single devices by-product gas supply meet the demands, the supply rate of by-product gas meets the demands;
By-product gas buffer-type unit constraint condition, namely the by-product gas cabinet in the intermediate buffering of the by-product gas energy will satisfy the requirement of pressure, fluctuations in discharge simultaneously, guarantees the by-product gas supply in a period of time and uses safety.
The step of described optimization on-line scheduling is:
A. read the schedule element parameters data: namely read by-product gas supply and demand system instrument supplemental characteristic, described supplemental characteristic is more capable in real time, renewal speed be 5-10 second once;
B. entered function module prediction: namely enter pipe network mathematical model, by-product gas supply and demand system forecast model and by-product gas supply and demand system Optimal Operation Model and predict;
C. enter and calculate the by-product gas flow number: according to the production schedule and optimized mathematical model method, carry out the coal gas user assignment and calculate, finish the data after by-product gas is dispatched primary Calculation and distribution;
D. judge buffering and security condition: as satisfy the storage of by-product gas cabinet, the pipeline pressure security settings namely enters following step e, as not satisfying the storage of by-product gas cabinet, then enters step h;
E. the dynamic early warning of by-product gas: namely whether satisfy constraint condition;
F. system is judged: inserting needle is judged early warning, then enters step g as satisfying the constraint condition of setting, and then enters step I as not satisfying the constraint condition of setting;
G. carry out the adjustment scheme, automatically calculate the optimal scheduling scheme, enter step I;
H. the error of calculation;
I. database in phase, more new database.
The present invention compared with prior art has following beneficial effect:
(1) can increase substantially the throughput rate of iron and steel enterprise's energy device, guarantee that each gas equipment can work under Design cooling load, improve equipment operating efficiency;
(2) to the online regulation and control of various by-product gas, can effectively reduce coal gas diffusion, take full advantage of the secondary coal gas energy, guarantee that production economy rationally moves, realize energy-conservation and environmental benefit;
When (3) unusual and accident occurring in by-product gas production and marketing unit, can make in time, predict fast and accurately and processing scheme that the impact that fault is caused is controlled at bottom line;
(4) can be for the dispatcher provide the scheduling theory foundation, reduce the subjective blindness of scheduling, make traffic order issuing down promptly and accurately;
(5) provide historical data dispatching, gas equipment operational factor, produce for making iron and steel enterprise in order, the decision-making of leadership provides the significant data parameter.
Below in conjunction with drawings and Examples the present invention is described in further detail:
Description of drawings
Fig. 1 is by-product gas Optimal Scheduling overall construction drawing;
Fig. 2 is by-product gas supply and demand system simplified block diagram;
Fig. 3 be the piping network simplified can flow Transport Model figure;
Fig. 4 is the block diagram of finding the solution of by-product gas a kind of simplicial method of optimizing on-line scheduling.
Embodiment
A kind of smelter by-product gas off-line analysis on-line scheduling method, comprise the by-product gas supply and demand system that is formed by by-product gas output equipment and coal gas use equipment, the smelter by-product gas production and marketing project management system that is formed by terminal and management server, described by-product gas production and marketing project management system is according to the turnaround plan of by-product gas supply and demand system, the production schedule, by-product gas consumes account of the history and by-product gas supply situation establishment by-product gas supply and demand plan sheet and sends the scheduling production ordering, and by-product gas output equipment provides needed by-product gas resource to by-product gas use equipment; A data collection server is connected with described by-product gas production and marketing project management system, described method further is: described data collection server is passed through the pipe network mathematical model according to the by-product gas supply and demand plan sheet that described smelter by-product gas production and marketing project management system provides with scheduling production ordering and by-product gas resource data, by-product gas supply and demand system forecast model and by-product gas supply and demand system Optimal Operation Model, carry out the by-product gas supply and demand, the comparison of actual consumption and plan, analyze and to mark, and with form, chart, the statistical of curve shows, and realizes the optimization on-line scheduling of smelter by-product gas supply and demand system;
Described by-product gas output equipment and coal gas use equipment comprise that by-product gas produces the equipment such as equipment, by-product gas consumer device, by-product gas transmission pipeline, by-product gas mixing pressurizing point, various valve instruments;
Described pipe network mathematical model is: the by-product gas supply and demand plan sheet that at first provides according to smelter by-product gas production and marketing project management system, scheduling production ordering and by-product gas resource, that sets up piping network can flow Transport Model, obtain that by-product gas transports and the pressure that causes and the variation of temperature in pipe network, provide the predicted value of by-product gas pressurizing point top hole pressure, ensure the pressure coupling of Gas Resource both sides of supply and demand; For by-product gas provides constraint condition on the transport capability in ducted scheduling, guarantee that scheduling scheme is effectively carried out simultaneously;
Described by-product gas supply and demand system forecast model is: according to the ruuning situation of described by-product gas supply and demand system, carry out the analytical calculation of the by-product gas energy, prediction and EQUILIBRIUM CALCULATION FOR PROCESS take the network node of the intermediate buffering of the by-product gas energy and by-product gas energy terminal point as the by-product gas resource provide foundation; According to dynamic factor, the impact of fluctuating factor situation on consuming with energy equipment by-product gas product, formulate the dynamic prediction scheme of energy device prediction simultaneously, by-product gas supply and demand system forecast function is accurate under the assurance current intelligence;
Described by-product gas supply and demand system Optimal Operation Model is: according to the scheduling foundation of by-product gas supply and demand system under different operating modes, set up respectively with by-product gas and diffuse minimum and Income Maximum that by-product gas uses as the Optimal Operation Model of target.
Method among the embodiment realizes by the by-product gas Optimal Scheduling, described by-product gas dispatching system is a huge distributed integrated system, should take into full account the data exchange capability with infrastructure device, data communication device is crossed the smelter coal gas production and marketing project management system network connection that terminal is connected with management server and is connected with data collection server, jointly realizes the functions such as by-product gas data acquisition, storage, management and scheduling.
As shown in Figure 1, by-product gas Optimal Scheduling general structure consists of by three layers, comprise respectively information acquisition layer, real time data processing layer and application operating layer, comprise in the described information acquisition layer that data collection and control passes through EMS system made communications protocol, needs image data by the by-product gas supply and demand system; Described real time data processing layer is comprised of terminal and management server, includes historical data base and real-time data base; Described application operating layer is by-product gas application operating layer, and this operation layer has display device and input equipment, and its major function is by-product gas scheduling, balance, plan etc.Wherein the software and hardware of information acquisition layer all is the original software and hardware of infrastructure device, does not need to acquire in addition; The application operating layer is mainly the human-computer interaction function that operating personnel provide, and realizes data visualization, finishes the artificial data mode input; Data analysis layer is the core of dispatching system, comprises described pipe network mathematical model, by-product gas supply and demand system forecast model and coal gas supply and demand system Optimal Operation Model, Expert System for Schedule storehouse, real-time data base etc.
As shown in Figure 2, the Transport Model that can flow of a by-product gas pipe network comprises by-product gas generation systems 1, by-product gas stocking system 2, by-product gas mixes pressurization security system 3 and by-product gas coal gas user 4, described by-product gas generation systems is by blast furnace by-product gas 1-1, converter by-product gas 1-2 and coke oven by-product gas 1-3 form, described by-product gas stocking system is by blast furnace by-product gas cabinet 2-1, converter by-product gas cabinet 2-2 and coke oven by-product gas cabinet 2-3 form, by-product gas mixes the pressurization security system by by-product gas diffusion system 3-1, by-product gas commingled system 3-2 and by-product gas compression system 3-3 form, and described by-product gas user comprises sintering circuit 4-1, coking process 4-2, Iron-smelting 4-3, steel making working procedure 4-4, steel rolling process 4-5, generating operation 4-6 and aided process 4-7.Form the first blast furnace by-product gas pipe network 5 between blast furnace by-product gas and the blast furnace by-product gas cabinet, form the first converter by-product gas pipe network 6 between converter by-product gas and the converter by-product gas cabinet, form the first coke oven by-product gas pipe network 7 between coke oven by-product gas and the coke oven by-product gas cabinet; Blast furnace by-product gas cabinet and by-product gas mix formation the second blast furnace by-product gas pipe network 8 between the pressurization security system, form the second converter by-product gas pipe network 9 between converter by-product gas cabinet and the by-product gas mixing pressurization security system; Coke oven by-product gas cabinet and by-product gas mix formation the second coke oven by-product gas pipe network 10 between the pressurization security system; Described by-product gas mixes formation by-product gas user pipe network 11 between pressurization security system and the by-product gas user.
In above-described embodiment:
One, foundation for the pipe network mathematical model, the by-product gas supply and demand system is an extremely complicated pipe system as seen from Figure 2, for such complex system modeling, the foundation of model is found the solution extremely complicated, therefore be necessary original pipe network physical model is arranged some hypothesis and restrictive condition is set, wherein:
(1) by-product gas cabinet, by-product gas mixing station, by-product gas pressurizing point and by-product gas mixing station are not the production consumer devices of by-product gas, only be thought of as the ducted part of by-product gas, only incite somebody to action the restrictive condition that ductwork pressure wherein uses as by-product gas;
(2) the by-product gas bleeding device is assumed to be the coal gas user, the last coal gas user when its restrictive condition is all coal gas user oeprations at full load;
(3) by-product gas supervisor net includes only blast furnace by-product gas, coke oven by-product gas, converter by-product gas pipe network, with the high burnt individual consumer that by-product gas consumption is thought of as respectively blast furnace by-product gas coke oven by-product gas that mixes;
(4) therefore the refining coal gas that exists in the pipe network only regard it user of coke oven by-product gas as owing to only use the coke oven by-product gas;
(5) ignoring the leakage problem that exists in the by-product gas transmission course reaches because the disturbed condition that error in dipping causes;
(6) restrictive condition that has of some fixed equipment will become restrictive condition as the modeling weight factor.
Gaspipe network can be simplified according to above-mentioned condition, be provided with S coal gas supervisor net, be respectively S
1, S
2S
k, and N is arranged
1, N
2N
iIndividual by-product gas consumable unit and N
1, N
2N
jIndividual by-product gas productive unit links with supervisor's net, and the pipe network model of simplification as shown in Figure 3.According to by-product gas pipe network illustraton of model, available following formula represents:
Element in the matrix can only equal-1,0,1, for element N
I, jHave:
Two, for the foundation of described by-product gas supply and demand system forecast model: among the embodiment, the by-product gas model of element is the minimum production unit with scheduler object, in order to describe the concrete situation of each unit.The Gas Production technique that consumes, produces owing to each element in the by-product gas scheduling unit model is different, therefore it is infeasible numerous by-product gas scheduling units being used single modeling method, according to the character of use of unit it is classified for this reason, specific as follows:
(1) by-product gas production and marketing fixed unit, it is the linear unit of by-product gas production and marketing and the production schedule, as the given production schedule then generation and the consumption of by-product gas all be the numerical value of relatively fixing, data are continuous, such as coke oven, heating furnace, boiler etc.; These model of element characteristics are in the middle of production run, and the value volume and range of product of the generation of by-product gas and consumption (no matter single by-product gas still mixes by-product gas) is definite value, can not arbitrarily replace and change, otherwise will affect normal production.
(2) by-product gas production and marketing changeable type unit, it is more that this department pattern affects parameter, and the generation consumption of its coal gas is gone out by the many kinds of parameters combined action, generally have functional relation, need to use mathematical method to find the solution, and much data have hysteresis quality and uncertainty, data stability is poor; Such as blast furnace etc.; These model of element characteristics are in the middle of production run, the value volume and range of product of the generation of by-product gas and consumption (no matter single by-product gas still mixes by-product gas) has controllability, replace and change and do not affect normal production, but has certain constraint condition, such as gas proportion, flow, calorific value etc.
(3) by-product gas buffer-type unit namely stores as by-product gas and buffering is used the unit, when the by-product gas amount is large, provides storage space, Decrease of discharge; When the by-product gas amount is inadequate, provides emergent coal gas for production and application, and guarantee that production has stable pressure, composition, temperature with by-product gas; Mix station etc. such as by-product gas cabinet, by-product gas pressurization; This unit characteristics is the scheduling unit with energy source cache ability, and the production and marketing of coal gas is not participated in this unit, but the by-product gas pipe network is had certain adjustment ability.The size of its surge capability depends on by-product gas cabinet amount of capacity, the constraint of cabinet position rate of change, the constraint of cabinet position bound, ductwork pressure scope etc.
For different by-product gas unit, it is as follows to set up respectively its mathematical model:
(1) by-product gas production and marketing fixed unit mathematical model:
For by-product gas production and marketing fixed unit model, be characterized in that by-product gas produces that the amount of disappearing is unique after given input to be determined, so can be directly take the linear function expression formula as:
In the formula:
Energy resource consumption or generation for by-product gas production and marketing fixed unit;
(2) by-product gas production and marketing changeable type unit mathematical model:
For by-product gas production and marketing changeable type unit model, the product relation of disappearing between the various energy that is characterized in has controllability, regulate various by-product gas proportion relations by the stoichiometric factor of the different by-product gas energy, the model tormulation formula that adopts partial least-square regression method to set up is:
In the formula:
Consumption coefficient for by-product gas production and marketing changeable type unit n;
Be by-product gas production and marketing changeable type unit production task;
(3) by-product gas buffer-type unit mathematical model:
By-product gas buffer-type unit itself is the consumption of by-product gas not, just should have by-product gas to have certain buffer action, and it still can adopt the partial least square method modeling, and the model tormulation formula of foundation is:
In the formula:
Coal gas influx for the by-product gas buffer device:
Three, foundation for described by-product gas supply and demand system Optimal Operation Model: the final goal of by-product gas system optimization scheduling is to seek the best practice that by-product gas utilizes, realize economic benefit, environmental benefit maximization, so-called maximizing the benefits is exactly the value that considers by-product gas, an overall evaluation system producing the injury values of value-added content of product and carrying capacity of environment.Because coal gas production and marketing is in a relatively unbalanced dynamic process always, follows the production schedule, turnaround plan and various emergency situations and change the focus of work that best by-product gas scheme under prevailing condition of how to confirm is the coal gas Optimized Operation.The basis that the accentization scheduling model is set up is to determine objective function, and to guarantee that production safety, device security and the supply of by-product gas energy stabilizing are as constraint condition.We can say that this scheduling unit is divided into adjustable unit and unadjustable unit as mentioned above, and buffer cell is as a kind of thread of restrictive condition, in setting up model as by-product gas excessively then diffuse, the by-product gas deficiency then closed portion can regulate the by-product gas unit.
Wherein, the parameter that relates to of Optimal Operation Model comprises:
(1) by-product gas pipeline parameter S
k, being located at enterprises has k by-product gas pipe network, comprising i of buffering pipe network and individual without buffering pipe network j, wherein i+j=k are arranged;
(2) be connected to by-product gas pipe network S
kParameter is established the by-product gas production and marketing fixed unit that is connected on this pipe network and is add up to u, and its setup parameter is N
K, uIf the by-product gas production and marketing changeable type unit that is connected on this pipe network adds up to v, its setup parameter is N
K, v
(3) time parameter of establishing scheduling is t
i
(4) for given time interval t
i, certain pipe network S
k, following manufacturing variables parameter is arranged:
A.
Be the by-product gas of by-product gas production and marketing changeable type unit from certain energy pipe network k consumption;
B.
Be the by-product gas of by-product gas production and marketing fixed unit from certain energy pipe network k consumption;
C.
Be the by-product gas of by-product gas production and marketing changeable type unit from certain energy pipe network k production;
D.
Be the by-product gas of by-product gas production and marketing fixed unit from certain energy pipe network k production;
E.
Be pipe network S
kBy-product gas turnout sum;
F.
Be pipe network S
kBy-product gas consumption sum;
G.
Be pipe network S
kThe by-product gas amount of diffusing;
By-product gas Optimized Operation balance equation: according to the by-product gas production status, when blast furnace by-product gas, coke oven by-product gas directly diffuse when more than needed; When the converter by-product gas, have more than needed and then stop to reclaim the converter by-product gas.And when by-product gas is not enough, then close down the equipment that some is used for regulating by-product gas.Can set up by-product gas balance equation group by Optimized Operation setting parameter before is:
By-product gas Optimized Operation equation objective function: according to the balance optimizing needs, by-product gas balance equation group optimization aim is:
(1) by-product gas supply and marketing balance:
The purpose of supply and marketing balance is that it is in a basic balance to reach the by-product gas supply and demand by reasonable adjustment productive unit, and optimum target is that by-product gas does not namely diffuse and do not have deficiency yet, and the equation of foundation is as follows:
(2) the by-product gas amount of diffusing minimum:
The purpose of the by-product gas amount of diffusing minimum is by reasonable adjustment productive unit, and by-product gas is all consumed, and the equation of foundation is as follows:
By-product gas Optimized Operation equation constraint condition: because smelter production run and complexity thereof will make model have practicality, must carry out some restrictive conditions to system of equations, the constraint condition of use is specific as follows:
(1) by-product gas production and marketing overall balance constraint condition:
No matter how balance scheduling of coal gas, its total amount is constant, and its concrete equation is as follows:
(2) by-product gas production and marketing changeable type unit constraint condition:
Can normally produce in order to guarantee it for by-product gas production and marketing changeable type unit, heat request, single devices by-product gas supply meet the demands with regard to requiring transformable by-product gas proportioning (being calorific value) to satisfy to add, the supply rate of by-product gas meets the demands, and the system of equations of foundation is as follows:
In the formula:
(3) by-product gas buffer-type unit constraint condition:
By-product gas buffer-type unit requires mainly to refer to the by-product gas cabinet in the intermediate buffering of the by-product gas energy in the enterprise, the by-product gas cabinet requires the interior by-product gas reserves of cabinet in a rational scope, to satisfy simultaneously the requirement that pressure flow changes, guarantee the by-product gas supply in a period of time (one day or two days) and use safety.
Its constrain equation is as follows:
In the formula:
By-product gas Optimized Operation general equation: can set up by-product gas total activation equation according to by-product gas Optimized Operation balance equation, objective function equation, constraining equation, as follows:
The method for solving of by-product gas Optimized Operation general equation: finding the solution of by-product gas Optimized Operation general equation can be regarded finding the solution of a linear programming problem as, model problem can be converted into a pure mathematics and find the solution the problem of linear programming after establishing equation.For by-product gas optimizing scheduling mathematical model, it is as follows to find the solution the feature that this problem has: comprise a linear equation and represent that optimum finds the solution target, and comprise constraint condition and the monomer variable function that useable linear equation or inequality represent.
Because by-product gas Optimized Operation general equation comprises decision variable, constraint condition and three key elements of objective function that linear programming has, be typically to show the property planning problem.Simplicial method, decomposition algorithm, revised simplex method, two-phase method, large M method, projected scale's method and interior point method all are the important method for solving of linear programming problem, and for the gas dispatching model, present embodiment is only considered to use simplicial method to find the solution.
What simplicial method was found the solution this linear programming problem is substantially: have the polyhedral convex set of the feasible zone of linear programming problem in the multi-C vector space, if having optimal value then must obtain at the place, certain summit of this convex set, the solution of this point correspondence is basic feasible solution.Simplex is sent out the basic thought of finding the solution: to a basic feasible solution that draws, analyze, judge whether it is optimum solution; If not, then be transformed into the basic feasible solution of another optimization according to certain rule, judge again; If also be not, then again conversion repeats by this, and according to said method obtains optimum solution always; In addition, if problem without solution, the method also can provide the block diagram of finding the solution of a kind of simplicial method that as shown in Figure 4 by-product gas optimizes on-line scheduling.
Wherein, the step of described optimization on-line scheduling is:
A. read the schedule element parameters data: namely read by-product gas supply and demand system instrument supplemental characteristic, described supplemental characteristic is more capable in real time, renewal speed be 5-10 second once;
B. entered function module prediction; Namely entering pipe network mathematical model, by-product gas supply and demand system forecast model and by-product gas supply and demand system Optimal Operation Model predicts; Comprise historical data contrast, calculated with mathematical model, experts database analysis, as occurring than great fluctuation process, data exception then occurs and report to the police, otherwise enter step c;
C. enter and calculate the by-product gas flow number; According to the production schedule and optimized mathematical model method, carry out the coal gas user assignment and calculate, finish the data after by-product gas is dispatched primary Calculation and distribution;
D. judge buffering and security condition; As satisfy by-product gas cabinet storage, the pipeline pressure security settings namely enters following step e, as not satisfying the storage of by-product gas cabinet, then enters step h;
E. whether the dynamic early warning of by-product gas namely satisfies constraint condition;
F. system is judged, judges for early warning, then enters step g as satisfying the constraint condition that satisfies of setting, and then enters step I as not satisfying the constraint condition of setting;
G. carry out the adjustment scheme, automatically calculate the optimal scheduling scheme, enter step I;
H. the error of calculation is calculated and is finished;
I. database in phase, more new database.
And for the solution procedure of by-product gas Optimized Operation general equation: according to setting up model and finding the solution block diagram, can determine that another kind of by-product gas optimizes the on-line scheduling method, concrete solution procedure is as follows:
(1) determines the quantity of by-product gas pipe network and the quantity of participation by-product gas scheduling unit according to physical model;
(2) confirm the network structure matrix according to the pipe network simplified model, matrix need to embody the connection of scheduling unit and by-product gas pipe network;
(3) ability (model of element comprises buffer cell, production and marketing fixed unit, production and marketing changeable type unit) of the different scheduling units of affirmation;
(4) input time variable, determine scheduling zero-time and termination time;
(5) import production and marketing fixed unit by-product gas parameter, in order to determine that this unit needs the by-product gas amount:
(6) introduce the production schedule, in order to carry out next step calculating;
(7) import production and marketing changeable type unit by-product gas parameter, in order to determine that this unit needs the by-product gas amount;
(8) read scheduling each by-product gas reserves value zero hour, initialization schedule information;
(9) initialization constant is namely inputted the parameter such as storage parameter, each by-product gas scheduling unit calorific value characteristic, operation of the calorific value of different by-product gas, different by-product gas cabinets;
(10) initialization finishes, the beginning solving model;
(11) find the solution calculating, judge whether customer parameter was adjusted, if then adjust constraint condition (according to system's experts database); Otherwise adopt the parameter setting of acquiescence, and by the some other parameter of the adjustment of model adaptation, enter next step iteration;
(12) generate the equation of constraint of each scheduling unit that becomes the period, and import the decision variable bound;
(13) automatically generate by-product gas co-ordination of supply and marketing equation;
(14) the select target function is found the solution;
(15) judge that whether conclusion is set up, and if not, returns (11); Otherwise withdraw from, the output model result formulates scheduling scheme.
Claims (4)
1. smelter by-product gas off-line analysis on-line scheduling method, comprise the by-product gas supply and demand system that is formed by by-product gas output equipment and coal gas use equipment, the smelter by-product gas production and marketing project management system that is formed by terminal and management server, described by-product gas production and marketing project management system is according to the turnaround plan of by-product gas supply and demand system, the production schedule, by-product gas consumes account of the history and by-product gas supply situation establishment by-product gas supply and demand plan sheet and sends the scheduling production ordering, and by-product gas output equipment provides needed by-product gas resource to by-product gas use equipment; A data collection server is connected with described by-product gas production and marketing project management system, it is characterized in that, described method further is: described data collection server is passed through the pipe network mathematical model according to the by-product gas supply and demand plan sheet that described smelter by-product gas production and marketing project management system provides with scheduling production ordering and by-product gas resource data, by-product gas supply and demand system forecast model and by-product gas supply and demand system Optimal Operation Model, carry out the by-product gas supply and demand, the comparison of actual consumption and plan, analyze and to mark, and with form, chart, the statistical of curve shows, and realizes the optimization on-line scheduling of smelter by-product gas supply and demand system;
Described pipe network mathematical model is: the by-product gas supply and demand plan sheet that at first provides according to smelter by-product gas production and marketing project management system, scheduling production ordering and by-product gas resource, that sets up piping network can flow Transport Model, obtain that by-product gas transports and the pressure that causes and the variation of temperature in pipe network, provide the predicted value of by-product gas pressurizing point top hole pressure, ensure the pressure coupling of Gas Resource both sides of supply and demand; For by-product gas provides constraint condition on the transport capability in ducted scheduling, guarantee that scheduling scheme is effectively carried out simultaneously;
Described by-product gas supply and demand system forecast model is: according to the ruuning situation of described by-product gas supply and demand system, carry out the analytical calculation of the by-product gas energy, prediction and EQUILIBRIUM CALCULATION FOR PROCESS take the network node of the intermediate buffering of the by-product gas energy and by-product gas energy terminal point as the by-product gas resource provide foundation; According to dynamic factor, the impact of fluctuating factor situation on consuming with energy equipment by-product gas product, formulate the dynamic prediction scheme of energy device prediction simultaneously, by-product gas supply and demand system forecast function is accurate under the assurance current intelligence;
Described by-product gas supply and demand system Optimal Operation Model is: according to the scheduling foundation of by-product gas supply and demand system under different operating modes, set up respectively with by-product gas and diffuse minimum and Income Maximum that by-product gas uses as the Optimal Operation Model of target.
2. a kind of smelter by-product gas off-line analysis on-line scheduling method according to claim 1, it is characterized in that the described Transport Model that can flow comprises that by-product gas generation systems, by-product gas stocking system, by-product gas mix pressurization security system and by-product gas user;
Described by-product gas generation systems is comprised of blast furnace by-product gas, converter by-product gas and coke oven by-product gas;
Described by-product gas stocking system is become by blast furnace by-product gas cabinet, converter by-product gas cabinet and coke oven by-product gas group;
Described by-product gas mixes the pressurization security system and is comprised of by-product gas diffusion system, by-product gas commingled system and by-product gas compression system;
Described by-product gas user comprises sintering circuit, coking process, Iron-smelting, steel making working procedure, steel rolling process, generating operation and aided process;
Form the first blast furnace by-product gas pipe network between blast furnace by-product gas and the blast furnace by-product gas cabinet, form the first converter by-product gas pipe network between converter by-product gas and the converter by-product gas cabinet, form the first coke oven by-product gas pipe network between coke oven by-product gas and the coke oven by-product gas cabinet; Blast furnace by-product gas cabinet and by-product gas mix formation the second blast furnace by-product gas pipe network between the pressurization security system, form the second converter by-product gas pipe network between converter by-product gas cabinet and the by-product gas mixing pressurization security system; Coke oven by-product gas cabinet and by-product gas mix formation the second coke oven by-product gas pipe network between the pressurization security system; Described by-product gas mixes formation by-product gas user pipe network between pressurization security system and the coal gas user.
3. a kind of smelter by-product gas off-line analysis on-line scheduling method according to claim 1 is characterized in that described by-product gas provides the constraint condition on the transport capability to be in ducted scheduling:
By-product gas production and marketing overall balance constraint condition, i.e. no matter how balance scheduling of by-product gas, its total amount is constant;
By-product gas production and marketing changeable type unit constraint condition requires namely transformable gas proportion to satisfy to add that heat request, single devices by-product gas supply meet the demands, the supply rate of by-product gas meets the demands;
By-product gas buffer-type unit constraint condition, namely the by-product gas cabinet in the intermediate buffering of the by-product gas energy will satisfy the requirement of pressure, fluctuations in discharge simultaneously, guarantees the by-product gas supply in a period of time and uses safety.
4. a kind of smelter by-product gas off-line analysis on-line scheduling method according to claim 1 is characterized in that the step of described optimization on-line scheduling is:
A. read the schedule element parameters data: namely read by-product gas supply and demand system instrument supplemental characteristic, described supplemental characteristic is more capable in real time, renewal speed be 5-10 second once;
B. entered function module prediction: namely enter pipe network mathematical model, by-product gas supply and demand system forecast model and by-product gas supply and demand system Optimal Operation Model and predict;
C. enter and calculate the by-product gas flow number: according to the production schedule and optimized mathematical model method, carry out the coal gas user assignment and calculate, finish the data after by-product gas is dispatched primary Calculation and distribution;
D. judge buffering and security condition: as satisfy the storage of by-product gas cabinet, the pipeline pressure security settings namely enters following step e, as not satisfying the storage of by-product gas cabinet, then enters step h;
E. the dynamic early warning of by-product gas: namely whether satisfy constraint condition;
F. system is judged: namely judge for early warning, then enter step g as satisfying the constraint condition of setting, then enter step I as not satisfying the constraint condition of setting;
G. carry out the adjustment scheme: namely automatically calculate the optimal scheduling scheme, enter step I;
H. the error of calculation;
I. database in phase, more new database.
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