CN103134570B - Method for authenticating steam output and consumption in iron and steel enterprises - Google Patents

Abstract

The invention relates to a method for authenticating different procedures of steam output and consumption in iron and steel enterprises. The method establishes steam flow authentication models for three different procedures: establishing a relationship model between the steam flow and the boiler production variable quantity for a stable steam production source, establishing a relationship model between factors influencing steam output of each device and the steam flow for a procedure of recovering a waste heat steam source, and establishing a relationship model of influencing the steam output and the steam flow in each link for a procedure (user) of consuming the steam. The method formulates a specific implementation process for establishing the steam flow authentication models, establishes a model base, and applies the method combining with searching, mending and updating in the steam flow authentication models. The method provides a real-time authentication method for steam instantaneous flow and cumulative flow in iron and steel procedures, improves the reliability of the steam measurement, solves the problems of measurement shortage and disputes caused by low accuracy and stopped measurement in iron and steel enterprises steam measurement, and achieves energy assessment, energy conservation and consumption reduction.

Description

The method of a kind of iron and steel enterprise steam generation and consumption authentication

Technical field

The present invention relates to a kind of method that is applied to the different operation steam generations of iron and steel enterprise and consumption authentication.

Background technology

Iron and Steel Enterprises in China consumes mass energy every year, and reducing iron and steel energy consumption has important meaning to the sound development of national economy.Reclaiming and utilizing residual heat and energy to produce steam recycling is one of effectively energy-saving and cost-reducing means of present steel enterprise.Each operation point is connected with steam pipe system, to realize the comprehensive utilization of steam.Enterprise, in order to reduce energy cost, requires the production process of steam pipe system connection and instant flow and the integrated flux of user's operation steam to measure, and process energy consumption is carried out to economic examination, to strengthen awareness of saving energy, promotes process energy consumption to manage.

The generation of steam and the metering of consumption belong to the envelop of function of EMS (energy management system), and flowmeter is all equipped with at the entrance and exit place that enterprise is connected with each operation at steam pipe system.But the measuring accuracy of these flowmeters is low.

The reason that iron and steel enterprise's steam measurement precision is low is:

1. the type selecting of flow measurement of steam instrument is limited in scope, and performance has much room for improvement.The reading of same pipeline different instrument also has very large difference;

2. the Calibration Technology of flow measurement of steam instrument lacks, instrument calibration and calibration difficulties.

3. the selection of instrument, I&M are improper;

4. the character of water vapour is complicated, is accompanied by temperature and pressure decline, phase transformation in transmitting procedure, and in metering, the improper meeting of the temperature pressure compensation of vapour density causes larger error.

5. flow sensor, transmitter, data acquisition module or network break down, and the actual value of the data substantial deviation flow measuring in use even causes stopping metering;

When EMS stops measuring because of instrument inefficacy, loss of data, network failure in to steam pipe system flow measurement, general energy administrative authority stops the length between timing according to the < < of this enterprise measuring control regulation > > basis,, half monthly average average according to sky, monthly average and the flow estimation of mean annual method during stopping meter are out as authentication value, but this authentication value lacks persuasion.

Because steam measurement exists above problem, make the metering measurement shoutage of steam pipe system sometimes up to 30-40%, cause metering dispute.

Steam enters the production of steam and the information of use behind operation inside and belongs to MES (manufacturing execution system), the complete or basic not metering of the inner steam measurer table of operation.But the generation of steam and use amount are decided by inner structure and the production operation state of production process, by decomposing main the steaming and consume vapour link of each operation of iron and steel enterprise, the flow steam flow authentication model of each link in setting up with the detection, execution information that come from MES system, and the instant flow of this operation of reconstruct and integrated flux steam flow authentication model according to this.Therefore generation and the consumption of steam are verified at production link.At the flow instrument of this operation point when manual confirmation is normally worked, with the measured value checking of instrument with revise steam flow authentication model parameter; When instrument breaks down, authentication value is as a kind of metrical information of redundancy, make supervisory system to a certain extent maintain normal operation.The way combining with variable and operation authentication, improves the reliability of steam flow monitoring in real time and rationally solves metering dispute being beneficial to.

Summary of the invention

Not high for iron and steel enterprise's steam measurement accuracy of instrument, sometimes break down stop metering, cause that total generation and total flow occur in steam pipe system metering differs problem far away, propose this method for accounting and the authentication of each operation point steam generation and consumption, for rationally solving metering dispute, provide foundation.

The technical scheme that the present invention adopted is for achieving the above object: the method for a kind of iron and steel enterprise steam generation and consumption authentication, set up steam flow authentication model database, according to season and production status, deposit steam flow authentication model in steam flow authentication model database, implement following steps:

Read the real time data relevant with steam flow authentication model with MES from EMS;

In steam flow authentication model database, the steam flow authentication model that meets current season and production status is called in retrieval, and described steam flow authentication model comprises to be stablized vapour source steam production steam flow authentication model, waste heat recovery vapour source steam production steam flow authentication model and consume steam operation steam consumption steam flow authentication model;

With MES data and steam flow authentication model, calculate the authentication value of steam flow, instant flow and integrated flux that described authentication value is steam;

The measured value and the authentication value that compare steam flow, if when relative deviation is less than certain limit, recording measured value is present flow rate; If when relative deviation surpasses certain limit, judge whether flowmeter damages; If Causing Flowmeter Damages, recording authentication value is present flow rate, maintenance instrument; If flowmeter does not damage, correction model, and season, time and production status information that correction model is occurred deposit steam flow authentication model database in.

Describedly authenticate relevant real time data with steam flow and comprise

MES data: stablize the required boiler boiler fills flow F of vapour source steam production steam flow authentication model _w, boiler liquid level h, boiler-steam dome pressure p, heating power P, Boiler Steam outlet temperature T and pressure and temperature reducing add water coefficient χ; The operating condition S of the steam recovery apparatus that waste heat recovery vapour source steam production steam flow authentication model is required ₁, production equipment loading coefficient r, i platform equipment benchmark Steam Recovery rate F _ri0, Steam Recovery coefficient q _{α i}with equipment additional coefficient λ; Consume i the required steam by vapour link of steam operation steam consumption steam flow authentication model and use state S _2i, basic steam consumption F _c0i, seasonal factor s _iwith steam consumption coefficient F _{α i}; EMS data: the instant flow of the steam corresponding with three kinds of authentication models and the measured value of integrated flux.

The method for building up of described stable vapour source steam production steam flow authentication model is:

The first step, check to confirm for detection of instrumentation normal;

Second step, according to the base value F of the steam production of the definite separate unit steam boiler of design _b0, and boiler steady production flow is F _b0time corresponding process variable value, i.e. initial value vector, is designated as:

x ₀＝(F _w0，h ₀，p ₀，P ₀，T ₀，χ ₀)

The 3rd step, when steam boiler production status is different from second step state and stable operation, records one group of boiler operatiopn data (F _b1, F _w1, h ₁, p ₁, P ₁, T ₁, χ ₁), each data is no more than initial value vector respective items 10%, forms sample, and is treated to:

x ₁＝(F _w1，h ₁，p ₁，P ₁，T ₁，χ ₁)-x ₀

y ₁＝F _b1-F _b0

In like manner analogize, obtain the 2nd ..., m organizes data, (x ₂, y ₂) .... (x _m, y _m),

Make X=(x ₁, x ₂..., x _m) ^t, Y=(y ₁, y ₂..., y _m) ^t;

The 4th step, utilizes formula

θ＝(XX ^T) ^-1X ^TY (7)

Ask steam flow authentication model parameter θ;

The 5th step, obtains the static appraising model authentication value of Boiler Steam generation

F _b(t)＝xθ+F _b0 (8)

Authentication value with the accumulated value of boiler for producing steam flow

$Q_b\left(t\right)=Q_b\left(\mathrm{kT}\right)={\&Integral;}_0^t{F}_b\left(t\right)\mathrm{dt}\&ap;\underset{i=0}{\overset{k}{\mathrm{\&Sigma;}}}{F}_b\left(k{T}_s\right)T_s---\left(9\right)$

Described steam boiler is for starting boiler, 130t/h boiler and coke dry quenching boiler.

The method for building up of described waste heat recovery vapour source steam production steam flow authentication model is:

The first step, according to the feature of operation, is divided into the inner separate equipment that steams of N platform by this operation, determines every equipment benchmark Steam Recovery rate F _ri0yield in unit time with production process design; Make i=1;

Second step, determines the Steam Recovery coefficient q of i platform equipment _{α i};

Q when this equipment belongs to continuous producing apparatus _{α i}get 1;

When this equipment belongs to the batch (-type) cycle during production equipment, to one-period T=aT _sinterior Steam Recovery coefficient is pressed at interval of T _sonce sampling, obtains a sequence, and this sequence is:

$q_{\mathrm{\&alpha;i}}=\left(n_0{T}_s\right)=\underset{j=0}{\overset{a}{\mathrm{\&Sigma;}}}{q}_{\mathrm{\&alpha;ij}}\mathrm{\&delta;}(n_0{T}_s-j{T}_s)---\left(16\right)$

Q in formula _{α ij}(j=0,1 ..., a) be the j+1 time sampled value in this sequence; n ₀t _sfor this sequence coordinate; δ (n ₀t _s-jT _s) be unit impulse function, get the mean value of many group sample sequence respective value respective value q as model sequence _{α ij};

The 3rd step, obtains i platform equipment at kT _sproduce the authentication value of the instant flow of steam

F _i(kT _s)＝λ _i(kT _s)S _1i(kT _s)r _i(kT _s)q _αi(kT _s-T ₀)F _ri0 (17)

T in formula ₀the moment starting in this production cycle for this equipment, if continuous producing apparatus, q _{α i}(T _s-T ₀) get 1;

The 4th step, i=i+1 turns second step, until i=N;

The 5th step, obtains the authentication value of the integrated flux of steam

$Q_r\left(t\right)=Q_r\left(\mathrm{kT}\right)={\&Integral;}_0^t{F}_r\left(t\right)\mathrm{dt}\&ap;\underset{i=0}{\overset{k}{\mathrm{\&Sigma;}}}{F}_r\left(\mathrm{iT}\right)T---\left(15\right)$

The 6th step, while confirming that instrument is normal, contrasts with authentication value by actual measured value, while surpassing 10% as relative deviation, returns to the first step; Otherwise confirmation model.

The method for building up of described consumption steam operation steam consumption steam flow authentication model is:

The first step, is divided into M by this operation and uses vapour link, determines the basic steam consumption F that each uses vapour link _c0iyield in unit time with this link design; Make i=1;

Second step, determines the steam consumption coefficient F of i link _{α i}:

F when this production link is continuous type _{α i}get 1;

When this production link is while producing in the batch (-type) cycle, to one-period T=bT _sinterior steam consumption coefficient is pressed at interval of T _sonce sampling, obtains a sequence, and this sequence is:

$F_{\mathrm{\&alpha;i}}\left(n_0{T}_s\right)=\underset{j=0}{\overset{b}{\mathrm{\&Sigma;}}}{F}_{\mathrm{\&alpha;ij}}\mathrm{\&delta;}(n_0{T}_s-j{T}_s)---\left(22\right)$

Q in formula _{α ij}(j=0,1 ..., b) be the j+1 time sampled value in this sequence; n ₀t _sfor this sequence coordinate; δ (n ₀t _s-jT _s) be unit impulse function, get the mean value of the respective value of many group sample sequences respective value F as model sequence _{α ij}.

The 3rd step, determines that i link is at kT _sconsume the instant flow authentication value of steam

F _ci(kT _s)＝S _2i(kT _s)s _i(kT _s)F _αi(kT _s-T ₁)F _0i (23)

T in formula ₁for thering is the moment that periodically this production link of production feature link started in this production cycle, if continuous production link, F _{α i}(kT _s-T ₁) get 1;

The 4th step, i=i+1 turns second step, until i=M;

The 5th step, obtains the authentication value of the integrated flux of steam

$Q_c\left(t\right)=Q_c\left(k{T}_s\right)={\&Integral;}_0^t{F}_c\left(t\right)\mathrm{dt}\&ap;\underset{i=0}{\overset{k}{\mathrm{\&Sigma;}}}{F}_c\left(i{T}_s\right)T_s---\left(21\right)$

The 6th step, while confirming that instrument is normal, contrasts with authentication value by actual measured value, as relative deviation surpasses 10%, returns to the first step; Otherwise confirmation model.

Described relative deviation is (measured value-authentication value)/measured value.

The invention provides the real-time identifying method of the instant flow of iron and steel operation steam and integrated flux, improved the reliability of steam measurement, be beneficial to and solve iron and steel enterprise's steam measurement because of measurement shoutage and metering dispute problem that precision is low, stop measuring etc. causes, realize energy check and energy-saving and cost-reducing.

Accompanying drawing explanation

Tu1Shi iron and steel enterprise steam pipe system system and message structure block diagram;

Fig. 2 sets up to stablize vapour source steam production steam flow authentication model process flow diagram;

Fig. 3 sets up waste heat recovery vapour source steam production steam flow authentication model process flow diagram;

Fig. 4 sets up to consume steam operation steam consumption steam flow authentication model process flow diagram;

Fig. 5 is the application process process flow diagram of steam flow authentication model.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in further detail.

As shown in Figure 1, in typical iron and steel enterprise, the operation relevant to steam pipe system and the trend of steam all mark in the drawings.After realizing production information, steam pipe system monitoring, metering all belong to EMS system, mainly monitor temperature, pressure, the flow of the entrance and exit of pipe network; Steam the operation flow that enters pipe network and the flow that uses steam operation consumption steam are respectively produced in metering simultaneously.In the inside of each operation, automatic control system is carried out the task of detection, adjusting and the monitoring of production status variable, and this part of information set becomes MES system.A lot of EMS of iron and steel enterprise and MES have mutual access function.This is for implementing the invention provides condition.

1. the population equilibrium of iron and steel enterprise's steam use amount design

Iron and steel enterprise, when design, can, according to the situation of built by separate periods, determine steam generation and the consumption of each production technology link, and under the prerequisite of reasonable consideration loss, realize the overall equilibrium of supply and demand by the condition of normal production.Yi Mou iron company first stage of the project steam population equilibrium is designed to example, in Table 1.

Table 1: the design of steam supply and demand population equilibrium (unit: ton/hour)

Note: as for summer heat exchange station refrigeration to need quantity of steam be 10t/h.

The equilibrium of supply and demand design load of steam is common state in producing, thereby the base value using it as links steam generation and consumption.Each operation consists of multiple devices or a plurality of link, and these base values are reasonably allocated to individual device or links according to experience, calculating, metering situation.In actual production, the instant flow of each equipment and link steam and integrated flux steam flow authentication model will be based upon on the basis of these base values.

2. set up the method for steam generation steam flow authentication model

Iron and steel enterprise's steam is produced required steam for stable providing, and is provided with special steam boiler (starting boiler, 130t/h boiler, coke dry quenching boiler).In addition, steam is mainly from waste heat recovery, obvious heat of smoke, product sensible heat, slag sensible heat etc.Its main retracting device is waste heat boiler, vaporization cooling device.

1) set up the method for stablizing vapour source steam production steam flow authentication model

Steam boiler (starting boiler, 130t/h boiler, coke dry quenching boiler) be stable vapour source, in production limited among a small circle in adjusting.The most important variable that affects steam boiler steam production is: the pressure of boiler fills flow, boiler liquid level, boiler-steam dome, heating power, Boiler Steam outlet temperature and pressure and temperature reducing add water coefficient.If steam boiler steams, flow is

F _b(t)＝F(F _w，h，p，P，T，χ，t) (1)

Wherein, F _w-boiler boiler fills flow, t/h; H-boiler liquid level, m; The pressure of p-boiler-steam dome, Mpa; P-heating power, KJ/s; T-Boiler Steam outlet temperature, ℃; χ-pressure and temperature reducing adds water coefficient.

According to boiler principle of work, according to energy conservation and conservation of matter, can set up the mechanism model of boiler, this model belongs to multivariable nonlinearity model.In order to make problem reduction, (1) formula is used near its stable operating point to Taylor expansion, become linear model.Consider mechanism model and measuring error, mechanism model can be write as

$F_b\left(t\right)=F_{b0}+\frac{\&PartialD;F}{\&PartialD;F_w}(F_w-F_{w0})+\frac{\&PartialD;F}{\&PartialD;h}(h-h_0)+\frac{\&PartialD;F}{\&PartialD;p}(p-p_0)+\frac{\&PartialD;F}{\&PartialD;P}(P-P_0)+\frac{\&PartialD;F}{\&PartialD;T}(T-T_0)+\frac{\&PartialD;F}{\&PartialD;P}(\mathrm{\&chi;}-{\mathrm{\&chi;}}_0)+\mathrm{\&epsiv;}---\left(2\right)$

In formula, the value of lower marker tape 0 all represents the representative value of this variable under the normal condition of production of boiler, or gets the mean value of each variable in a period of time steady production process.The dynamic perfromance of taking into account system, in formula, all local derviations are all the function of time.Considering Dynamic Processes, does not regard local derviation as constant, order

y＝F _b(t)-F _b0 (3)

x＝(x ₁，x ₂，x ₃，x ₄，x ₅，x ₆)＝(F _w-F _w0，h-h ₀，p-p ₀，P-P ₀，T-T ₀，χ-χ ₀) (4)

$\mathrm{\&theta;}={({\mathrm{\&theta;}}_1,{\mathrm{\&theta;}}_2,{\mathrm{\&theta;}}_3,{\mathrm{\&theta;}}_4,{\mathrm{\&theta;}}_5,{\mathrm{\&theta;}}_6)}^T={(\frac{\&PartialD;F}{\&PartialD;F_w},\frac{\&PartialD;F}{\&PartialD;h},\frac{\&PartialD;F}{\&PartialD;\mathrm{\&alpha;}},\frac{\&PartialD;F}{\&PartialD;p},\frac{\&PartialD;F}{\&PartialD;P},\frac{\&PartialD;F}{\&PartialD;P})}^T{|}_{X=0}---\left(5\right)$

If collected the data sample of m group under steady operational status, (5) can be write as so:

Y＝Xθ+E (6)

Y ∈ R in formula ^{m * 1}, X ∈ R ^{m * 6}, by sample data, by row, formed respectively.

Coefficient of determination battle array θ is exactly a multiple linear regression problem.According to least square method, can obtain:

θ＝(XX ^T) ^-1X ^TY (7)

So far, determined the static appraising model of Boiler Steam generation:

F _b(t)＝xθ+F _b0 (8)

Although fluctuations in discharge when static appraising model and actual motion can be variant, the time of transient process seems very short with respect to the stable operation duration; In addition, mainly consider the accumulated value of flow during flow authentication, dynamic changing process is very little on the impact of the result of accumulation.The accumulated value of boiler for producing steam flow is:

$Q_b\left(t\right)=Q_b\left(\mathrm{kT}\right)={\&Integral;}_0^t{F}_b\left(t\right)\mathrm{dt}\&ap;\underset{i=0}{\overset{k}{\mathrm{\&Sigma;}}}{F}_b\left(k{T}_s\right)T_s---\left(9\right)$

Wherein, T _sfor data collection cycle.

Specific implementation process as shown in Figure 2, and is explained as follows Fig. 2:

The first step, checks and confirms for detection of normal by the instrumentation of formula (1) regulation variable;

Second step, according to the base value F of the steam production of the definite separate unit boiler of design _b0(as table 1 starts boiler, separate unit 35t/h), and boiler steady production flow is F _b0time process variable corresponding to (detected variable substantially remain unchanged) value be referred to as initial value vector, and be designated as:

x ₀＝(F _w0，h ₀，p ₀，P ₀，T ₀，χ ₀)

The 3rd step, when boiler for producing state is different from second step state and stable operation, records one group of boiler operatiopn data (F _b1, F _w1, h ₁, p ₁, P ₁, T ₁, χ ₁) (each data is no more than initial value vector respective items 10%) formation sample, and be handled as follows by formula (3) (4):

x ₁＝(F _w1，h ₁，p ₁，P ₁，T ₁，χ ₁)-x ₀

y ₁＝F _b1-F _b0

In like manner analogize, obtain the 2nd ..., m organizes data, (x ₂, y ₂) .... (x _m, y _m),

Make X=(x ₁, x ₂..., x _m) ^t, Y=(y ₁, y ₂..., y _m) ^t;

The 4th step, utilizes formula (7) to ask steam flow authentication model parameter θ;

The 5th step, obtains steam flow authentication model formula (8) and formula (9).

Attention: 1. variable P-heating power does not generally all have direct-detection.For this reason, boiler is pressed calorific value and the supply rate conversion of fuel, and coke dry quenching boiler is pressed nitrogen flow and the temperature difference conversion of the boiler of coming in and going out.2. when this model of application, if certain variable is with respect to initial value vector x ₀deviation surpass 10%, should reset the initial value of this variable, repeat above step, ask for new model parameter and model, otherwise error increases.

2) set up the method for waste heat recovery vapour source steam production steam flow authentication model

What iron and steel enterprise recovering waste heat produced steam mainly contains sintering, steel-making, these operations of steel rolling.Each technique respectively has feature, when setting up model, considers the generation of steam and the output of this process links product, production run state; Some link (as dephosphorization, the decarbonizing furnace of steel-making) is produced and is also shown obvious periodicity, and the amount that therefore produces steam also shows periodically; Also to consider in addition because fault can not all put into operation, diffuses, pipe network loss etc.

Through the analysis to these production process general character and production run feature, set up unified steam generation model.

If this operation waste heat recovery apparatus has N platform, the afterheat steam flow that this operation produces can be designated as:

$F_r\left(t\right)=\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}{k}_i{F}_i\left(t\right)---\left(10\right)$

F in formula _ithe steam flow that-i platform equipment produces, t/h;

K _i-i platform equipment produces the scale-up factor that quantity of steam enters pipe network;

The scale-up factor that enters steam pipe system be mainly for diffusing, blowdown, pipe network loss and bypass, this value when normal production for approaching and be less than 1 constant; When production appearance is abnormal, all relevant with the variable valve of diffusion valve, bypass, interval is (0,1).

Definition 1: the operating condition S of steam recovery apparatus ₁, refer to that whether the steam recovery apparatus of this operation is in operation.

Definition 2: production equipment loading coefficient r, refers to the ratio of reality with the design load of this production process yield in unit time.

Definition 3: benchmark Steam Recovery rate F _ri0, refer to that the i platform equipment of this production process is design load (or empirical value actual and that produce) in yield in unit time, the mean value of unit interval recovered steam when production equipment and production status are normal.According to definition, be easy to find the numerical value corresponding with the benchmark Steam Recovery rate of sintering, steel-making, steel rolling.

Definition 4: Steam Recovery coefficient q _{α i}, refer to that the i platform steam recovery apparatus of this production process is design load in yield in unit time, the actual recovered rate of steam and benchmark Steam Recovery rate F _ri0ratio.

Benchmark Steam Recovery coefficient q _{α i}a variable, for batch production process (steel-making), q _{α i}variation range is larger, but because its changed by cycle, according to the actual conditions of producing, by certain sampling interval, obtains this cycle recovery coefficient table in the same time not, and it is applied as one group of constant.

For continuous flow procedure (sintering, steel rolling), q _{α i}fluctuation range is less, can process as the constant that is approximately 1.

Definition 5: equipment additional coefficient λ, (quality of steam that the unit interval reclaims, t/h) with the ratio of Steam Recovery rate under normal device maintenance state for the Steam Recovery rate of current device maintenance state.This coefficient changes the impact on Steam Recovery for describing equipment state, as heater for rolling steel insulation course comes off, can make amount of steam withdrawn increase, and this coefficient is greater than 1; Get 1 with plant maintenance state relation is unconspicuous.This coefficient belongs to gradual amount, along with correction is made in equipment lengthening service time.

Based on above definition, be not difficult to draw that the steam flow producing for i platform waste heat recovery apparatus is:

F _i(t)＝λ _i(t)S _1i(t)r _i(t)q _αi(t)F _ri0 (14)

I subscript in formula is indicated as the i platform equipment of current operation.Obviously, the parameter of every equipment and variable are all different.

Because unified model fully takes into account the feature of sintering, steel-making, three kinds of operations of steel rolling.Therefore applicable equally to three kinds of operations.

The value of accumulation amount of steam withdrawn is write as:

$Q_r\left(t\right)=Q_r\left(\mathrm{kT}\right)={\&Integral;}_0^t{F}_r\left(t\right)\mathrm{dt}\&ap;\underset{i=0}{\overset{k}{\mathrm{\&Sigma;}}}{F}_r\left(\mathrm{iT}\right)T---\left(15\right)$

Specific implementation process as shown in Figure 3, and is explained as follows Fig. 3:

The first step, according to the feature of operation, is divided into the inner separate equipment that steams of N platform by this operation.Analyze the yield in unit time of every equipment benchmark Steam Recovery rate and production process design; Make i=1.

Second step, determines the Steam Recovery coefficient q of i platform equipment _{α i}.

When belonging to continuous producing apparatus (sintering, hot rolling), this equipment gets 1;

When this equipment batch (-type) cycle is produced (steel-making), to one-period T=aT _sinterior Steam Recovery coefficient is pressed at interval of T _sonce sampling, obtains a sequence, and this sequence definition is:

$q_{\mathrm{\&alpha;i}}\left(n_0{T}_s\right)=\underset{j=0}{\overset{a}{\mathrm{\&Sigma;}}}{q}_{\mathrm{\&alpha;ij}}\mathrm{\&delta;}(n_0{T}_s-j{T}_s)---\left(16\right)$

Q in formula _{α ij}(j=0,1 ..., a) be the j+1 time sampled value in this sequence; n ₀t _sfor this sequence coordinate; δ (n ₀t _s-jT _s) be unit impulse function.Because production run is easily disturbed, every group of sample sequence respective value may be different.Get the mean value of many group sample sequence respective value for this reason respective value q as model sequence _{α ij}.

The 3rd step, derives i platform equipment at kT by formula (11) (12) (13) (14) (16) respectively _sproduce the instant flow steam flow authentication model of steam.

F _i(kT _s)＝λ _i(kT _s)S _1i(kT _s)r _i(kT _s)q _αi(kT _s-T ₀)F _ri0 (17)

T in formula ₀the moment starting in this production cycle for this equipment.If continuous producing apparatus, q _{α i}(kT _s-T ₀) get 1.

The 4th step, i=i+1 turns second step, until i=N.

The 5th step, according to formula (10), (15) obtain the steam flow authentication model of instant flow and integrated flux.

The 6th step, while confirming that instrument is normal, contrasts with authentication value by actual measured value, as relative deviation surpasses a certain scope (as 10%), returns to the first step; Otherwise confirmation model.

3. set up the method that consumes steam operation steam consumption steam flow authentication model

Through to belonging to the analysis of consumption steam operation in iron and steel technique, affect each factor with vapour point consumption and mainly contain basic consumption (average consumption), land use reform (continuously/interruption), season, production status (normal/abnormal) etc.Because more user does not connect flowmeter, its actual amount can only be estimated by production status.

For certain the iron and steel operation that consumes steam, its steam consumption is each link of this in-process (user) consumption sum.If the steam of certain iron and steel operation has M link, have:

$F_c\left(t\right)=\underset{i=1}{\overset{M}{\mathrm{\&Sigma;}}}{F}_{\mathrm{ci}}\left(t\right)---\left(16\right)$

F in formula _ci(t) be i the real-time steam consumption of using vapour link.In order to determine this variable, defined parameters:

Definition 6: steam is used state S _2i, refer to that i of current technique is current whether at the state that uses steam by vapour link.

Define this parameter mainly for the impact of factor on steam consumption such as the land use reform of equipment, maintenance.

Definition 7: basic steam consumption F _c0i, i of current technique average discharge that uses steam by vapour link when larger season of annual steam consumption.

Definition 8: seasonal factor s _i, refer to i of current technique with vapour link in current season steam average discharge account for the ratio of the basic steam consumption of this link.

Define this parameter and use steam flow to differ situation far away mainly for some equipment Various Seasonal, different according to season, value in interval [0,1].

Definition 9: steam consumption coefficient F _{α i}, refer to that i of this production process is design load by vapour link in yield in unit time, actual steam consumption and basic steam consumption F _0iratio.

Steam consumption coefficient F _{α i}a variable, for batch production process (steel-making), in different stage F _{α i}variation range is larger, but because its changed by cycle, according to the actual conditions of producing, by certain sampling interval, obtains this cycle recovery coefficient sequence in the same time not, is made one group of constant application.Disposal route is identical with definition 4 (being formula (13)).

To continuous production link, F _{α i}fluctuation range is less, can process as the constant that is approximately 1.

Based on above definition, learn that certain i flow that consumes steam link that consumes steam operation point is:

F _ci(t)＝S _2i(t)s _i(t)F _αi(t)F _0i (20)

I subscript in formula is indicated as i consumption steam link of current operation.Similar with afore-mentioned, the parameter of every link and variable are all different.

$Q_c\left(t\right)=Q_c\left(k{T}_s\right)={\&Integral;}_0^t{F}_c\left(t\right)\mathrm{dt}\&ap;\underset{i=0}{\overset{k}{\mathrm{\&Sigma;}}}{F}_c\left(i{T}_s\right)T_s---\left(21\right)$

Specific implementation process as shown in Figure 4, and is explained as follows Fig. 4:

The first step, according to the feature of operation, is divided into M by this operation and uses vapour link.Analyze the yield in unit time that each designs by the basic steam consumption of vapour link and this link; Make i=1.

Second step, determines the steam consumption coefficient F of i link _{α i}.

When belonging to continuous type, this production link gets 1;

When this production link is while the batch (-type) cycle producing (as RH refining), to one-period T=bT _sinterior steam consumption coefficient is pressed at interval of T _sonce sampling, obtains a sequence, and this sequence definition is:

$F_{\mathrm{\&alpha;i}}\left(n_0{T}_s\right)=\underset{j=0}{\overset{b}{\mathrm{\&Sigma;}}}{F}_{\mathrm{\&alpha;ij}}\mathrm{\&delta;}(n_0{T}_s-j{T}_s)---\left(22\right)$

Q in formula _{α ij}(j=0,1 ..., b) be the j+1 time sampled value in this sequence; n ₀t _sfor this sequence coordinate; δ (n ₀t _s-jT _s) be unit impulse function.Because production run is easily disturbed, the respective value of every group of sample sequence may be different.Get the mean value of the respective value of many group sample sequences for this reason respective value F as model sequence _{α ij}.

The 3rd step, derives i link at kT by formula (17) (18) (19) (20) (22) respectively _sconsume the instant flow steam flow authentication model of steam.

F _ci(kT _s)＝S _2i(kT _s)s _i(kT _s)F _αi(kT _s-T ₁)F _0i (23)

T in formula ₁for thering is the moment that periodically this production link of production feature link started in this production cycle.If continuous production link, F _{α i}(kT _s-T ₁) get 1.

The 4th step, i=i+1 turns second step, until i=M.

The 5th step, according to formula (16), (21) obtain the steam flow authentication model of instant flow and integrated flux.

The 6th step, while confirming that instrument is normal, contrasts with authentication value by actual measured value, as relative deviation surpasses a certain scope (as 10%), returns to the first step; Otherwise confirmation model.

4. the using method of steam flow steam flow authentication model

When using steam flow steam flow authentication model, in order to reduce time and the workload of each correction needs, can adopt the method for model data library management, deposit the model being applicable under the conditions such as different seasons, production status in database.In use, take the method in retrieval model, correction model, Renewal model storehouse, make the adaptability of steam flow authentication model stronger.

To the using method of steam flow steam flow authentication model as shown in Figure 5, and Fig. 5 is explained as follows: the first step, reads from EMS and MES and authenticates relevant real time data with steam measurement;

Second step, in model bank, the steam flow authentication model that meets current season and production status is called in retrieval;

The 3rd step, the flow authentication value of calculating with MES data and steam flow authentication model.

The 4th step, relatively flow measurements and authentication value.

When the two hardly differs (as relative deviation is less than 10%), recording measured value is present flow rate.

When the deviation of measured value and authentication value surpasses certain limit: whether analyze production status has extremely, whether reading has abnormal and judges according to balance of steam design table and empirical value whether EMS flowmeter damages (manual confirmation).

As judged, substitute Causing Flowmeter Damages measured value and note down with authentication value, and notice maintenance instrument.As judged, flowmeter is intact, the method correction model of setting up according to steam flow authentication model, and season, time and the production information relevant to steam flow authentication model that new correction model is occurred deposit model bank in.Return to the first step.

Claims (3)

1. The method of 1.Yi Zhong iron and steel enterprise steam generation and consumption authentication, is characterized in that, sets up steam flow authentication model database, deposits steam flow authentication model in steam flow authentication model database according to season and production status, implements following steps:

   Read the real time data relevant with steam flow authentication model with Manufacturing Executive System MES from energy management system EMS;

   In steam flow authentication model database, the steam flow authentication model that meets current season and production status is called in retrieval, and described steam flow authentication model comprises to be stablized vapour source steam production steam flow authentication model, waste heat recovery vapour source steam production steam flow authentication model and consume steam operation steam consumption steam flow authentication model;

   With Manufacturing Executive System MES data and steam flow authentication model, calculate the authentication value of steam flow, instant flow and integrated flux that described authentication value is steam;

   The measured value and the authentication value that compare steam flow, if when relative deviation is less than certain limit, recording measured value is present flow rate; If when relative deviation surpasses certain limit, judge whether flowmeter damages; If Causing Flowmeter Damages, recording authentication value is present flow rate, maintenance instrument; If flowmeter does not damage, correction model, and season, time and production status information that correction model is occurred deposit steam flow authentication model database in;

   The method for building up of described stable vapour source steam production steam flow authentication model is:

   The first step, check to confirm for detection of instrumentation normal;

   Second step, according to the base value F of the steam production of the definite separate unit steam boiler of design _b0, and boiler steady production flow is F _b0time corresponding process variable value, i.e. initial value vector, is designated as:

   x ₀＝(F _w0,h ₀,p ₀,P ₀,T ₀,χ ₀)

   The 3rd step, when steam boiler production status is different from second step state and stable operation, records one group of boiler operatiopn data (F _b1, F _w1, h ₁, p ₁, P ₁, T ₁, χ ₁), each data is no more than initial value vector respective items 10%, forms sample, and is treated to:

   x ₁＝(F _w1,h ₁,p ₁,P ₁,T ₁,χ ₁)-x ₀

   y ₁＝F _b1-F _b0

   In like manner analogize, obtain the 2nd ..., m organizes data, (x ₂, y ₂) .... (x _m, y _m),

   Make X=(x ₁, x ₂..., x _m) ^t, Y=(y ₁, y ₂..., y _m) ^t;

   The 4th step, utilizes formula

   θ＝(XX ^T) ^-1X ^TY (7)

   Ask steam flow authentication model parameter θ;

   The 5th step, obtains the static appraising model authentication value of Boiler Steam generation

   F _b(t)＝xθ+F _b0 (8)

   Authentication value with the accumulated value of boiler for producing steam flow

   $Q_b\left(t\right)=Q_b\left(\mathrm{kT}\right)={\&Integral;}_0^t{F}_b\left(t\right)\mathrm{dt}\&ap;\underset{i=0}{\overset{k}{\mathrm{\&Sigma;}}}{F}_b\left(k{T}_s\right)T_s---\left(9\right)$

   Wherein, T _sfor data collection cycle, k is positive integer;

   The method for building up of described waste heat recovery vapour source steam production steam flow authentication model is:

   The first step, according to the feature of operation, is divided into the inner separate equipment that steams of N platform by this operation, determines every equipment benchmark Steam Recovery rate F _ri0yield in unit time with production process design; Make i=1;

   Second step, determines the Steam Recovery coefficient q of i platform equipment _{α i};

   Q when this equipment belongs to continuous producing apparatus _{α i}get 1;

   When this equipment belongs to the batch (-type) cycle during production equipment, to one-period T=aT _sinterior Steam Recovery coefficient is pressed at interval of T _sonce sampling, obtains a sequence, and this sequence is:

   Q in formula _{α ij}(j=0,1 ..., a) be the j+1 time sampled value in this sequence; n ₀t _sfor this sequence coordinate; δ (n ₀t _s-jT _s) be unit impulse function, get the mean value of many group sample sequence respective value respective value q as model sequence _{α ij};

   The 3rd step, obtains i platform equipment at kT _sproduce the authentication value of the instant flow of steam

   F _i(kT _s)＝λ _i(kT _s)S _1i(kT _s)r _i(kT _s)q _αi(kT _s-T ₀)F _ri0 (17)

   Wherein, T _sfor data collection cycle, k is positive integer, T ₀the moment starting in this production cycle for this equipment, if continuous producing apparatus, q _{α i}(kT _s-T ₀) get 1;

   The 4th step, i=i+1 turns second step, until i=N;

   The 5th step, obtains the authentication value of the integrated flux of steam

   $Q_r\left(t\right)=Q_r\left(\mathrm{kT}\right)={\&Integral;}_0^t{F}_r\left(t\right)\mathrm{dt}\&ap;\underset{i=0}{\overset{k}{\mathrm{\&Sigma;}}}{F}_r\left(\mathrm{iT}\right)T---\left(15\right)$

   The 6th step, while confirming that instrument is normal, contrasts with authentication value by actual measured value, while surpassing 10% as relative deviation, returns to the first step; Otherwise confirmation model;

   The method for building up of described consumption steam operation steam consumption steam flow authentication model is:

   The first step, is divided into M by this operation and uses vapour link, determines the yield in unit time that each designs by the basic steam consumption Fc0i of vapour link and this link; Make i=1;

   Second step, determines the steam consumption coefficient F of i link _{α i}:

   F when this production link is continuous type _{α i}get 1;

   When this production link is while producing in the batch (-type) cycle, to one-period T=bT _sinterior steam consumption coefficient is pressed at interval of T _sonce sampling, obtains a sequence, and this sequence is:

   $F_{\mathrm{\&alpha;i}}\left(n_0{T}_s\right)=\underset{j=0}{\overset{b}{\mathrm{\&Sigma;}}}{F}_{\mathrm{\&alpha;ij}}\mathrm{\&delta;}(n_0{T}_s-j{T}_s)---\left(22\right)$

   Q in formula _{α ij}(j=0,1 ..., b) be the j+1 time sampled value in this sequence; n ₀t _sfor this sequence coordinate; δ (n ₀t _s-jT _s) be unit impulse function, get the mean value of the respective value of many group sample sequences respective value F as model sequence _{α ij};

   The 3rd step, determines that i link is at kT _sconsume the instant flow authentication value of steam

   F _ci(kT _s)＝S _2i(kT _s)s _i(kT _s)F _αi(kT _s-T ₁)F _0i (23)

   T in formula ₁for thering is the moment that periodically this production link of production feature link started in this production cycle, if continuous production link, F _{α i}(kT _s-T ₁) item gets 1, T _sfor data collection cycle, k is positive integer;

   The 4th step, i=i+1 turns second step, until i=M;

   The 5th step, obtains the authentication value of the integrated flux of steam

   $Q_c\left(t\right)=Q_c\left(k{T}_s\right)={\&Integral;}_0^t{F}_c\left(t\right)\mathrm{dt}\&ap;\underset{i=0}{\overset{k}{\mathrm{\&Sigma;}}}{F}_c\left(i{T}_s\right)T_s---\left(21\right)$

   Wherein, T _sfor data collection cycle, k is positive integer;

   The 6th step, while confirming that instrument is normal, contrasts with authentication value by actual measured value, as relative deviation surpasses 10%, returns to the first step; Otherwise confirmation model;

   Describedly authenticate relevant real time data with steam flow and comprise:

   Manufacturing Executive System MES data: stablize the required boiler boiler fills flow F of vapour source steam production steam flow authentication model _w, boiler liquid level h, boiler-steam dome pressure p, heating power P, Boiler Steam outlet temperature T and pressure and temperature reducing add water coefficient χ; The operating condition S of the steam recovery apparatus that waste heat recovery vapour source steam production steam flow authentication model is required ₁, production equipment loading coefficient r, i platform equipment benchmark Steam Recovery rate F _ri0, Steam Recovery coefficient q _{α i}with equipment additional coefficient λ; Consume i the required steam by vapour link of steam operation steam consumption steam flow authentication model and use state S _2i, basic steam consumption F _c0i, seasonal factor s _iwith steam consumption coefficient F _{α i};

   Energy management system EMS data: the instant flow of the steam corresponding with three kinds of authentication models and the measured value of integrated flux.
2. 2. the method for a kind of iron and steel enterprise steam generation according to claim 1 and consumption authentication, is characterized in that, described steam boiler is for starting boiler, 130t/h boiler and coke dry quenching boiler.
3. 3. the method for a kind of iron and steel enterprise steam generation according to claim 1 and consumption authentication, is characterized in that, described relative deviation is (measured value-authentication value)/measured value.