CN105276562A - Method and system for coordinating header system boilers - Google Patents
Method and system for coordinating header system boilers Download PDFInfo
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- CN105276562A CN105276562A CN201510830464.XA CN201510830464A CN105276562A CN 105276562 A CN105276562 A CN 105276562A CN 201510830464 A CN201510830464 A CN 201510830464A CN 105276562 A CN105276562 A CN 105276562A
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Abstract
The invention discloses a method for coordinating header system boilers. The method is used for coordinating at least two boilers. The method comprises the steps that optimal original distribution coefficients corresponding to all the boilers are obtained based on resistance loss values of a steam turbine corresponding to the boilers, and the output power change value of the steam turbine is acquired in real time; the maximum distribution coefficient of each boiler is obtained based on the output power change value and the current load, the load upper limit value and the load lower limit value of each boiler; and a final distribution coefficient is obtained based on the maximum distribution coefficient and original distribution coefficient of each boiler, and the actual adjusting load capacity of each boiler is obtained through the output power change value and the final distribution coefficient of each boiler. According to the method, the original distribution coefficients of all the boilers are distributed conditionally based on the different resistance loss values of the different boilers in the initial distribution stage, the original distribution coefficients can be determined more accurately, and it can be guaranteed that pipe losses are the lowest. The invention further discloses a system for coordinating the header system boilers.
Description
Technical field
The present invention relates to therrmodynamic system control technology field, more particularly, relate to a kind of coordination approach of header system boiler.In addition, the invention still further relates to a kind of coherent system of header system boiler.
Background technology
Present stage therrmodynamic system control field, usually adopt boiler steam turbine piping-main scheme unit to be formed.Generally adopt an Automatic Control of Boiler, and other boiler Non-follow control.Reason is that the boiler of more than two drops into when automatically controlling simultaneously, because boiler export pipeline is UNICOM, concussion easily occurs so throw automatic multiple stage boiler and disturbs mutually, cause cannot dropping into automatically simultaneously.
In order to address this problem in prior art, the whole boiler of usual employing coordinated control system adjusted in concert, although such setting can solve the problem of concussion, but because the characteristic of boiler and the arrangement array on female pipe are different, trunking loss is different, if adjusted in concert can cause overall efficiency low, and there will be part boiler export pressure superelevation or ultralow phenomenon.Another method is that system presets a fixing boiler distribution coefficient, when external load change is excessive, or when after operation a period of time, boiler load is close to peak load or minimum load border, the coefficient distributed can not mate with current working, and the load that irrational coefficient distribution can cause boiler to distribute can not perform effectively completely.Trunking loss all can not reduce by above-mentioned two situations, have impact on the overall efficiency of unit.
In sum, how making trunking loss drop to minimum, is current those skilled in the art's problem demanding prompt solution.
Summary of the invention
In view of this, the object of this invention is to provide a kind of coordination approach of header system boiler, trunking loss can reduce by the method, improves the overall efficiency of unit.Another object of the present invention is to provide a kind of coherent system of header system boiler, and this system improves response speed while trunking loss can being reduced, the final Control platform improving main-piping pressure.
To achieve these goals, the invention provides following technical scheme:
A coordination approach for header system boiler, for the coordination of at least two boilers, comprising:
S11: the drag losses value corresponding to every platform boiler based on steam turbine obtains the allocation coefficient of the optimum that described in every platform, boiler is corresponding, and the current loads of boiler described in the changing value of exerting oneself of steam turbine described in Real-time Obtaining, every platform, upper load limit value and load lower limit;
S12: the maximum allocated coefficient obtaining boiler described in every platform based on the current loads of boiler described in described changing value of exerting oneself, every platform, upper load limit value and load lower limit;
S13: obtain final distribution coefficient based on the described maximum allocated coefficient of boiler described in every platform and allocation coefficient, and the described final distribution coefficient of boiler described in changing value and every platform of exerting oneself described in passing through obtains the actual Load adjustment amount of boiler described in every platform.
Preferably, the described drag losses value corresponding to every platform boiler based on steam turbine obtains the allocation coefficient of the optimum of boiler described in every platform, comprising:
S111: according to formula K=8 λ l/ (π
2gd
5) calculate the drag losses value K of boiler described in every platform, wherein, λ is viscosity coefficient, and l is duct length, and g is acceleration of gravity, and d is pipe diameter;
S112: based on the principle that described drag losses value is contrary with the variation tendency of described allocation coefficient, obtain the allocation coefficient of boiler described in every platform, the allocation coefficient sum of all described boilers is 1.
Preferably, the described current loads based on boiler described in described changing value of exerting oneself, every platform, upper load limit value and load lower limit obtain the maximum allocated coefficient of boiler described in every platform, comprising:
S121: based on the current loads of boiler described in every platform, upper load limit value and load lower limit, obtain the load that described in every platform, boiler is current and upwards regulate interval value Δ H and load to regulate interval value Δ L downwards;
S122: when the described changing value Δ T that exerts oneself is timing, the maximum allocated coefficient M of boiler described in every platform is the ratio that load upwards regulates interval value Δ H and the described changing value Δ T that exerts oneself;
When the described changing value Δ T that exerts oneself is for time negative, the maximum allocated coefficient M of boiler described in every platform is the ratio that load regulates the absolute value of interval value Δ L and the described changing value Δ T that exerts oneself downwards;
When described boiler exits female pipe universal time coordinated, the maximum allocated coefficient M of described boiler is zero.
Preferably, the described described maximum allocated coefficient based on boiler described in every platform and allocation coefficient obtain final distribution coefficient, comprising:
S131: determine that any described boiler is target boiler successively, when the allocation coefficient of described target boiler is less than the maximum allocated coefficient of described target boiler, then the current distribution coefficient of described target boiler equals the allocation coefficient of described target boiler; When the allocation coefficient of described target boiler is more than or equal to the maximum allocated coefficient of described target boiler, then the current distribution coefficient of described target boiler equals the maximum allocated coefficient of described target boiler;
S132: if the current distribution coefficient sum of all boilers is less than 1, then the part less than 1 is supremum distribution coefficient, distributes to the boiler that current distribution coefficient is less than maximum allocated coefficient, obtains the final distribution coefficient of every platform boiler by described supremum distribution coefficient.
Preferably, the described boiler described supremum distribution coefficient distributed to current distribution coefficient and be less than maximum allocated coefficient, obtains the final distribution coefficient of every platform boiler, comprising:
S1321: according to formula X
y=1-Σ X
ndetermine the supremum distribution coefficient X of current all boilers
y; Wherein, Σ X
nfor the current distribution coefficient sum of all boilers;
S1322: according to formula Δ X
n=X
ys
n/ (1-Σ S
z), obtain current distribution coefficient described in every platform be less than the boiler of maximum allocated coefficient distribute the coefficient delta X of acquisition
n, and by current distribution coefficient X
nwith the coefficient delta X of described acquisition
nbe added and obtain new current distribution coefficient;
Wherein, n is the sequence number of boiler, X
yfor the supremum distribution coefficient of current all boilers, S
nbe the allocation coefficient of n-th boiler, Σ S
zfor all current distribution coefficients are more than or equal to the described allocation coefficient sum of the boiler of maximum allocated coefficient;
S1323: when the described current distribution coefficient newly of described boiler is greater than maximum allocated coefficient described in it, the current distribution coefficient of described boiler equals maximum allocated coefficient described in it; When the described current distribution coefficient newly of described boiler is less than or equal to maximum allocated coefficient described in it, the current distribution coefficient of described boiler equals current distribution coefficient new described in it;
S1324: if the current distribution coefficient sum of all boilers is less than 1, then return step S1321; If the current distribution coefficient sum of all boilers equals 1, then the described final distribution coefficient that described in every platform, the current distribution coefficient of boiler is boiler described in every platform.
Preferably, describedly obtain the actual Load adjustment amount of boiler described in every platform by the described final distribution coefficient of boiler described in changing value and every platform of exerting oneself, comprising:
According to formula Δ F
n=Δ T*X
n, obtain the actual Load adjustment amount of boiler described in every platform;
Wherein, X
nbe the final distribution coefficient of n-th boiler, Δ T is changing value of exerting oneself, Δ F
nthe actual Load adjustment amount of n-th boiler.
Preferably, described in obtain actual Load adjustment amount after, also comprise:
When working for multiple stage steam turbine is corresponding with multiple stage boiler, according to every platform, the actual Load adjustment of boiler each steam turbine corresponding measures the total load adjustment amount Σ Δ F of every platform boiler
n, formula is:
ΣΔF
n＝ΔT
1*X
n1+ΔT
2*X
n2+···+ΔT
i*X
ni；
Wherein, i is steam turbine sequence number, and n is boiler sequence number, Δ T
ibe the changing value of exerting oneself of i-th steam turbine, X
niit is the final distribution coefficient of corresponding i-th steam turbine of n-th boiler;
According to formula F
n=F
n'+Σ Δ F
n, obtain the absolute load instruction F of every platform boiler
n;
Wherein, F
nbe the absolute load instruction of n-th boiler, F
n' be the absolute load instruction of one-period on n-th boiler, Σ Δ F
nit is n-th this cycle of boiler total load adjustment amount.
A coherent system for header system boiler, comprising:
Acquisition module, for the current loads of the changing value of exerting oneself of Real-time Obtaining steam turbine, every platform boiler, upper load limit value and load lower limit;
Forward allocator module, drag losses value for corresponding to every platform boiler based on described steam turbine obtains the allocation coefficient of the optimum that described in every platform, boiler is corresponding, and obtains the maximum allocated coefficient of boiler described in every platform based on the current loads of boiler described in described changing value of exerting oneself, every platform, upper load limit value and load lower limit;
Recurrence distribution module, for obtaining final distribution coefficient based on the described maximum allocated coefficient of boiler described in every platform and allocation coefficient, and the described final distribution coefficient of boiler described in changing value and every platform of exerting oneself described in passing through obtains the actual Load adjustment amount of boiler described in every platform.
Preferably, described forward allocator module is also for according to formula K=8 λ l/ (π
2gd
5) calculate the drag losses value K of boiler described in every platform, and for based on the described drag losses value principle contrary with the variation tendency of described allocation coefficient, obtain the allocation coefficient of boiler described in every platform, the allocation coefficient sum of all described boilers is 1;
Wherein, λ is viscosity coefficient, and l is duct length, and g is acceleration of gravity, and d is pipe diameter.
Preferably, described forward allocator module also comprises:
Obtaining subelement, upwards regulating interval value Δ H and load to regulate interval value Δ L downwards for obtaining the current load of every platform boiler based on the current loads of boiler described in every platform, upper load limit value and load lower limit;
Computation subunit, for obtaining the maximum allocated coefficient of boiler described in every platform.
In said method, when the corresponding multiple stage boiler of steam turbine, the drag losses value of corresponding every platform boiler is different, and drag losses value is directly related with the coefficient of distribution, by the drag losses value determination allocation coefficient of every platform boiler, makes distribution more reasonable; Calculated the maximum allocated coefficient of every platform boiler by the current loads of the changing value of exerting oneself of current steam turbine, boiler, upper load limit value and load lower limit in second step; The reallocation carried out distribution coefficient in 3rd step realizes the final distribution to boiler distribution coefficient.Last boiler regulates according to this final distribution coefficient, can ensure that trunking loss is minimum, and can make follow-up adjustment comparatively quick, stable enter optimum state.
Present invention also offers a kind of coherent system of header system boiler, this system is used for realizing said method, and this system improves unit response speed while trunking loss can being reduced, and improves main-piping pressure Control platform.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the flow chart of the coordination approach specific embodiment one of header system boiler provided by the present invention;
Fig. 2 is the flow chart of the coordination approach specific embodiment two of header system boiler provided by the present invention;
Fig. 3 is the flow chart of the coordination approach specific embodiment three of header system boiler provided by the present invention;
Fig. 4 is the flow chart of the coordination approach specific embodiment four of header system boiler provided by the present invention;
Fig. 5 is the flow chart of the coordination approach specific embodiment five of header system boiler provided by the present invention;
Fig. 6 is the structure chart of the coherent system specific embodiment of header system boiler provided by the present invention.
In Fig. 1-6:
1 be acquisition module, 2 be forward allocator module, 3 for recurrence distribution module.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Core of the present invention is to provide a kind of coordination approach of header system boiler, and trunking loss can reduce by the method, improves the overall efficiency of unit.Another core of the present invention is to provide a kind of coherent system of header system boiler, and this system improves unit response speed while trunking loss can being reduced, and improves main-piping pressure Control platform.
Please refer to Fig. 1 to Fig. 6, Fig. 1 to Fig. 5 is respectively the flow chart of coordination approach specific embodiment one to the specific embodiment five of header system boiler provided by the present invention; Fig. 6 is the structure chart of the coherent system specific embodiment of header system boiler provided by the present invention.
The coordination approach of a kind of header system boiler provided by the present invention, for the coordination of at least two boilers, please refer to Fig. 1, method specifically comprises:
Step S11: the drag losses value corresponding to every platform boiler based on steam turbine obtains the allocation coefficient of optimum corresponding to every platform boiler, and the current loads of the changing value of exerting oneself of Real-time Obtaining steam turbine, every platform boiler, upper load limit value and load lower limit;
Step S12: the maximum allocated coefficient obtaining every platform boiler based on the current loads of changing value of exerting oneself, every platform boiler, upper load limit value and load lower limit;
Step S13: obtain final distribution coefficient based on the maximum allocated coefficient of every platform boiler and allocation coefficient, and obtain the actual Load adjustment amount of every platform boiler by the final distribution coefficient of exert oneself changing value and every platform boiler.
Need it is to be noted that above-mentioned changing value of exerting oneself refers to the power output of steam turbine, to be exerted oneself changing value by Real-time Obtaining, can adjust by the allocation coefficient to boiler for current period and the change in a upper cycle.Said method mainly in one-period to the adjustment of boiler, so be only introduced for one-period, certainly in use, need to be calculated by the difference of power output in former and later two cycles.
In said method, when the corresponding multiple stage boiler of steam turbine, the drag losses value of corresponding every platform boiler is different, and drag losses value is directly related with the coefficient of distribution, by the drag losses value determination allocation coefficient of every platform boiler, makes distribution more accurate; Calculated the maximum allocated coefficient of every platform boiler by the current loads of the changing value of exerting oneself of current period, every platform boiler, upper load limit value and load lower limit in second step; The reallocation carried out distribution coefficient in 3rd step realizes the optimization to boiler distribution coefficient.
In said method, when distributing the initial stage, by the difference of different boiler drag losses value, allocation coefficient can be determined more accurately, according to this allocation coefficient, boiler is regulated, can ensure that trunking loss is minimum, and can make follow-up adjustment comparatively quick, stable enter optimum state.
Adopt in above-described embodiment and carry out distribution with good conditionsi by the allocation coefficient of drag losses value to different boiler of every platform boiler, distribution principle wherein for step S11 can have a variety of, please refer to Fig. 2, Fig. 2 is the flow chart of specific embodiment two provided by the present invention, and wherein a kind of concrete method of salary distribution comprises:
Step S111: according to formula K=8 λ l/ (π
2gd
5) calculate the drag losses value K of every platform boiler, wherein, λ is viscosity coefficient, and l is duct length, and g is acceleration of gravity, and d is pipe diameter;
Step S112: based on the principle that drag losses value is contrary with the variation tendency of allocation coefficient, obtains the allocation coefficient of every platform boiler, and the allocation coefficient sum of all boilers is 1.
Need the principle that should be mentioned that above-mentioned variation tendency is contrary, can be specially for same boiler, when drag losses value increases, corresponding reduction allocation coefficient, and ensure adding and being 1 of the allocation coefficient of all boilers that steam turbine is corresponding, namely, when the drag losses value of a boiler is larger, the allocation coefficient that this boiler occupies is less.
Optionally, drag losses value and allocation coefficient can be the relation of inverse ratio, but in order to ensure adding and being 1 of all allocation coefficients, need to carry out a certain proportion of adjustment for each allocation coefficient.
In said method, directly related with allocation coefficient by the drag losses value calculated, and the state contrary in variation tendency, the optimum allocation coefficient of each boiler can be determined.
In one particular embodiment of the present invention, please refer to Fig. 3, Fig. 3 is the flow chart of specific embodiment three provided by the present invention, can specifically comprise for the step obtaining the maximum allocated coefficient of every platform boiler based on the current loads of changing value of exerting oneself, every platform boiler, upper load limit value and load lower limit in said method step S12:
Step S121: based on the current loads of every platform boiler, upper load limit value and load lower limit, obtain the current load of every platform boiler and upwards regulate interval value Δ H and load to regulate interval value Δ L downwards;
Step S122: changing value Δ T is timing when exerting oneself, the maximum allocated coefficient M of every platform boiler is that load upwards regulates interval value Δ H and the ratio of the changing value Δ T that exerts oneself;
When the changing value Δ T that exerts oneself is for time negative, the maximum allocated coefficient M of every platform boiler is that load regulates interval value Δ L downwards and the ratio of the absolute value of the changing value Δ T that exerts oneself;
When boiler exits female pipe universal time coordinated, the maximum allocated coefficient M of boiler is zero.
In the method that the present embodiment provides, load upwards regulates interval value to be the difference of boiler load higher limit and current loads, and load regulates interval value to be the current loads of boiler and the difference of load lower limit downwards.Adopt the difference according to changing value of exerting oneself, thus adopt the computational methods of different maximum allocated coefficients, for condition when boiler load exceedes setting border is determined, to be convenient in method when criticality appears in boiler, automatically regulation coefficient, sets condition easily for automatically regulating.
Please refer to Fig. 4, Fig. 4 is the flow chart of specific embodiment four provided by the present invention, can specifically comprise for the step obtaining final distribution coefficient based on the maximum allocated coefficient of every platform boiler and allocation coefficient in above-mentioned steps S13:
Step S131: determine that any boiler is target boiler successively, when the allocation coefficient of target boiler is less than the maximum allocated coefficient of target boiler, then the current distribution coefficient of target boiler equals the allocation coefficient of target boiler; When the allocation coefficient of target boiler is greater than the maximum allocated coefficient of target boiler, then the current distribution coefficient of target boiler equals the maximum allocated coefficient of target boiler;
By carrying out same judgement to all boilers in this step, may be used for judging whether boiler is in critical condition, and current distribution coefficient is defined as one less in allocation coefficient and maximum allocated coefficient.
Step S132: if the current distribution coefficient sum of all boilers is less than 1, then the part less than 1 is supremum distribution coefficient, supremum distribution coefficient is distributed to the boiler that current distribution coefficient is less than maximum allocated coefficient, obtains the final distribution coefficient of every platform boiler.
On the basis of previous step, because the allocation coefficient sum of all boilers equals 1, but the current distribution coefficient of each boiler equals one less in allocation coefficient and maximum allocated coefficient, so the current distribution coefficient sum of all boilers is necessarily less than or equal to 1, part less than 1, namely the current distribution coefficient sum of all boilers and the difference of 1 are supremum distribution coefficient, for distributing to other boilers, be specially the boiler that current distribution coefficient is less than maximum allocated coefficient, thus every platform boiler all obtains a final distribution coefficient.In this method, supremum distribution coefficient is distributed to the regulative mode of the boiler having not exceeded maximum allocated coefficient, it is the adjusted in concert for all boilers, but this adjustment can reach synchronous but that amplitude is different adjustment, can regulate for different boiler situations, instead of the method that simple employing is average.
The different distribution methods taked for different boiler mentioned in said method, detailed process has a variety of, in one particular embodiment of the present invention, please refer to Fig. 5, Fig. 5 is the flow chart of specific embodiment five provided by the present invention, for the boiler in above-mentioned steps S132, supremum distribution coefficient distributed to current distribution coefficient and be less than maximum allocated coefficient, obtain the step of the final distribution coefficient of every platform boiler, can specifically comprise:
Step S1321: according to formula X
y=1-Σ X
ndetermine the supremum distribution coefficient X of current all boilers
y; Wherein, Σ X
nfor the current distribution coefficient sum of all boilers;
First the supremum distribution coefficient X that can also participate in the distribution is determined in this step
yamount.
Step S1322: according to formula Δ X
n=X
ys
n/ (1-Σ S
z), obtain the current distribution coefficient of every platform be less than the boiler of maximum allocated coefficient distribute the coefficient delta X of acquisition
n, and by current distribution coefficient X
nwith the coefficient delta X obtained
nbe added and obtain new current distribution coefficient;
Wherein, n is the sequence number of boiler, X
yfor the supremum distribution coefficient of current all boilers, S
nbe the allocation coefficient of n-th boiler, Σ S
zfor all current distribution coefficients are more than or equal to the allocation coefficient sum of the boiler of maximum allocated coefficient;
In this step, 1-Σ S
zthe allocation coefficient sum of the boiler that can also participate in the distribution, S
n/ (1-Σ S
z) be the accounting of allocation coefficient in the allocation coefficient sum of the boiler that can also participate in the distribution of current calculating boiler, X
ys
n/ (1-Σ S
z) be the coefficient value that the boiler obtaining current calculating in current residual distribution coefficient by above-mentioned accounting should be assigned to.
Step S1323: when the new current distribution coefficient of boiler is greater than its maximum allocated coefficient, the current distribution coefficient of boiler equals its maximum allocated coefficient; When the new current distribution coefficient of boiler is less than or equal to its maximum allocated coefficient, the current distribution coefficient of boiler equals its new current distribution coefficient;
The new current distribution coefficient obtained in step S1322 may be less than, be equal to, or greater than maximum allocated coefficient, and selection principle also needs to observe above-mentioned choosing comparatively decimal principle.
Step S1324: if the current distribution coefficient sum of all boilers is less than 1, then return step S1321; If the current distribution coefficient sum of all boilers equals 1, then the current distribution coefficient of every platform boiler is the final distribution coefficient of every platform boiler.
In this step, if be less than 1, then illustrate that distribution does not also complete, and needs to return circulation and carries out; If equal 1, then illustrate that distribution completes just.
Need should be mentioned that the denominator 1-Σ S of formula in above-mentioned steps S1321
zit is the summation of the allocation coefficient of the boiler can also participated in the distribution under present case, that is when distributing each time, denominator is all variable quantity, namely, all reject the coefficient that can not distribute, because the coefficient summation can participated in the distribution in the assignment procedure is ever-reduced at every turn.Compared with the method for salary distribution of fixing denominator, the fast convergence rate of this method, denominator tapers off state, can ensure just can complete whole distribution afterwards carrying out n adjustment at most, and wherein, n is the sum of boiler.
Coefficient inappropriate problem when the method that the present embodiment provides solves adjusted in concert, and improve governing speed.Adopt the mode normally selecting fixing denominator in the method for mean value in prior art, that is adopt residual coefficient to be multiplied by the mode of allocation coefficient, but the convergence of supremum distribution coefficient is very slow, dispensing rate is very slow, is unfavorable for quick adjustment.In the method that the present embodiment adopts, denominator is variation, and namely during every sub-distribution, weed out the coefficient can not participated in the distribution, denominator successively decreases and makes it possible to greatly improve distributive operation efficiency.
Be introduced with an example below, comprise 4 boilers altogether, allocation coefficient is respectively S1=0.36, S2=0.44, S3=0.15, S4=0.05, and maximum allocated coefficient is by calculating M1=0.38, M2=0.08, M3=0.25, M4=1.2.
For the first time: according to selecting little principle, allocation result X1=0.36, X2=0.08, X3=0.15, X4=0.05, only have second boiler to reach the upper limit of self maximum allocated coefficient for the first time; Reply supremum distribution coefficient X
y=0.36 reallocates, and distributes to First, the 3rd and the 4th boiler;
For the second time: according to formula Δ X
n=X
ys
n/ (1-Σ S
z) calculate First, the 3rd and the 4th distribution coefficient that boiler obtains respectively, and with the result that the last time distributes carry out man-to-man add and, second time allocation result X1=0.38, X2=0.08, X3=0.2464, X4=0.0821; Can see, First boiler and second boiler all reach the upper limit, supremum distribution coefficient X
y=0.2114, need to distribute to the 3rd and the 4th boiler.
For the third time: according to formula Δ X
n=X
ys
n/ (1-Σ S
z) calculate the distribution coefficient of the 3rd and the 4th boiler respectively, third time allocation result X1=0.38, X2=0.08, X3=0.25, X4=0.135; First, second and third boiler has reached the supremum distribution coefficient X that reaches the standard grade all
y=0.155, need to distribute to the 4th boiler.
4th time: allocation result X1=0.38, X2=0.08, X3=0.25, X4=0.29; Supremum distribution coefficient X
y=0, terminate to distribute.
In said method, after only obtaining final distribution coefficient, also need the calculating carrying out actual Load adjustment amount, obtained the step of the actual Load adjustment amount of every platform boiler by the final distribution coefficient of exert oneself changing value and every platform boiler, can specifically comprise:
According to formula Δ F
n=Δ T*X
n, obtain the actual Load adjustment amount of every platform boiler;
Wherein, X
nbe the final distribution coefficient of n-th boiler, Δ T is changing value of exerting oneself, Δ F
nthe actual Load adjustment amount of n-th boiler.
Final distribution coefficient can be calculated with changing value of exerting oneself accordingly by said method, obtain the actual Load adjustment amount of every platform boiler, actual change adjustment can be carried out to boiler.
In actual service condition, be generally many steam turbines and many boiler combination, so for the situation of multiple stage steam turbine, need to sum up the load of same boiler corresponding to multiple steam turbine, obtain whole adjustment amounts of a boiler.Detailed process is:
Actual Load adjustment according to every platform boiler each steam turbine corresponding measures the total load adjustment amount Σ Δ F of every platform boiler
n, formula is:
ΣΔF
n＝ΔT
1*X
n1+ΔT
2*X
n2+···+ΔT
i*X
ni；
Wherein, i is steam turbine sequence number, and n is boiler sequence number, Δ T
ibe the changing value of exerting oneself of i-th steam turbine, X
niit is the final distribution coefficient of corresponding i-th steam turbine of n-th boiler;
According to formula F
n=F
n'+Σ Δ F
n, obtain the absolute load instruction F of every platform boiler
n;
Wherein, F
nbe the absolute load instruction of n-th boiler, F
n' be the absolute load instruction of one-period on n-th boiler, Σ Δ F
nit is n-th this cycle of boiler total load adjustment amount.
Calculating in the coordination approach of a kind of header system boiler provided by the present invention is realized by increment, and boiler can drop into coordination at any time, also can exit at any time, is finally absolute load instruction, can avoids the disturbance of conventional control switching.In addition, the coefficient distribution principle that said method adopts is lost minimum principle based on the resistance of ducting and is distributed, and can improve the overall efficiency of unit.
Except the coordination approach of a kind of header system boiler that above-described embodiment provides, the present invention also comprises a kind of coherent system that can realize the header system boiler of said method, and this system mainly comprises:
Acquisition module, for the current loads of the changing value of exerting oneself of Real-time Obtaining steam turbine, every platform boiler, upper load limit value and load lower limit;
Forward allocator module, drag losses value for corresponding to every platform boiler based on steam turbine obtains the allocation coefficient of optimum corresponding to every platform boiler, and obtains the maximum allocated coefficient of every platform boiler based on the current loads of changing value of exerting oneself, every platform boiler, upper load limit value and load lower limit;
Recurrence distribution module, for obtaining final distribution coefficient based on the maximum allocated coefficient of every platform boiler and allocation coefficient, and obtains the actual Load adjustment amount of every platform boiler by the final distribution coefficient of exert oneself changing value and every platform boiler.
The coherent system of the header system boiler that the present embodiment provides mainly comprises three modules, three modules complete above-mentioned technology contents respectively, can know, this system is used for realizing said method, so the use procedure of system is consistent with said method, for the use procedure of this system, do not repeat them here.
In a specific embodiment provided by the present invention, forward allocator module is used for according to formula K=8 λ l/ (π
2gd
5) calculate the drag losses value K of every platform boiler, and for based on the drag losses value principle contrary with the variation tendency of allocation coefficient, obtain the allocation coefficient of every platform boiler, the allocation coefficient sum of all boilers is 1;
Wherein, λ is viscosity coefficient, and l is duct length, and g is acceleration of gravity, and d is pipe diameter.
Be directed to above-mentioned specific embodiment two, can know, forward allocator module for adjusting allocation coefficient needs the determination being carried out allocation coefficient by drag losses value, so forward allocator module also should have the effect calculating drag losses value, and carry out work according to the principle in said method.
In a specific embodiment provided by the present invention, in said method content about obtain and distribute particular content, the function of forward allocator module specifically can be divided.
Wherein, forward allocator module 2 also comprises acquisition subelement and computation subunit, wherein: obtain subelement, interval value Δ H and load is upwards regulated to regulate interval value Δ L downwards for obtaining the current load of every platform boiler based on the current loads of every platform boiler, upper load limit value and load lower limit; Computation subunit, for obtaining the maximum allocated coefficient of every platform boiler.
In addition, recurrence distribution module 3 can be specially for determining that any boiler is target boiler successively, when the allocation coefficient of target boiler is less than the maximum allocated coefficient of target boiler, then the current distribution coefficient of target boiler equals the allocation coefficient of target boiler; When the allocation coefficient of target boiler is greater than the maximum allocated coefficient of target boiler, then the current distribution coefficient of target boiler equals the maximum allocated coefficient of target boiler; If the current distribution coefficient sum of all boilers is less than 1, then the part less than 1 is supremum distribution coefficient, supremum distribution coefficient is distributed to the boiler that current distribution coefficient is less than maximum allocated coefficient, obtains the final distribution coefficient of every platform boiler.
In order to complete above-mentioned functions, recurrence distribution module 3 mainly comprises:
Supremum distribution factor determination unit, for according to formula X
y=1-Σ X
ndetermine the supremum distribution coefficient X of current all boilers
y; Wherein, Σ X
nfor the current distribution coefficient sum of all boilers;
Current distribution coefficient determining unit, according to formula Δ X
n=X
ys
n/ (1-Σ S
z), obtain the current distribution coefficient of every platform be less than the boiler of maximum allocated coefficient distribute the coefficient delta X of acquisition
n, and by current distribution coefficient X
nwith the coefficient delta X obtained
nbe added and obtain new current distribution coefficient; Related symbol is corresponding with said method place;
Selected unit, for when the new current distribution coefficient of boiler is greater than its maximum allocated coefficient, the current distribution coefficient of boiler equals its maximum allocated coefficient; When the new current distribution coefficient of boiler is less than or equal to its maximum allocated coefficient, the current distribution coefficient of boiler equals its new current distribution coefficient;
Accounting unit, for the relation of the current distribution coefficient sum and 1 that judge all boilers, if the current distribution coefficient sum of boiler is less than 1, then makes supremum distribution factor determination unit again calculate; If the current distribution coefficient sum of boiler equals 1, then the current distribution coefficient of every platform boiler is the final distribution coefficient of every platform boiler.
Can know, the module correspondence of the coherent system of header system boiler all should be corresponding with the coordination approach of above-mentioned header system boiler with occupation mode, so use procedure does not repeat them here.
Except the content disclosed in above-described embodiment, for other parts such as obtain manner and account form of the steam turbine mentioned and boiler method of attachment, design parameter please refer to prior art in the present invention, repeat no more herein.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
Above the coordination approach of a kind of header system boiler provided by the present invention and system are described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a coordination approach for header system boiler, for the coordination of at least two boilers, is characterized in that, comprising:
S11: the drag losses value corresponding to every platform boiler based on steam turbine obtains the allocation coefficient of the optimum that described in every platform, boiler is corresponding, and the current loads of boiler described in the changing value of exerting oneself of steam turbine described in Real-time Obtaining, every platform, upper load limit value and load lower limit;
S12: the maximum allocated coefficient obtaining boiler described in every platform based on the current loads of boiler described in described changing value of exerting oneself, every platform, upper load limit value and load lower limit;
S13: obtain final distribution coefficient based on the described maximum allocated coefficient of boiler described in every platform and described allocation coefficient, and the described final distribution coefficient of boiler described in changing value and every platform of exerting oneself described in passing through obtains the actual Load adjustment amount of boiler described in every platform.
2. the method coordinated of header system boiler according to claim 1, is characterized in that, the described drag losses value corresponding to every platform boiler based on steam turbine obtains the allocation coefficient of the optimum of boiler described in every platform, comprising:
S111: according to formula K=8 λ l/ (π
2gd
5) calculate the drag losses value K of boiler described in every platform, wherein, λ is viscosity coefficient, and l is duct length, and g is acceleration of gravity, and d is pipe diameter;
S112: based on the principle that described drag losses value is contrary with the variation tendency of described allocation coefficient, obtain the allocation coefficient of boiler described in every platform, the allocation coefficient sum of all described boilers is 1.
3. the method for header system boiler coordination according to claim 1, it is characterized in that, the described current loads based on boiler described in described changing value of exerting oneself, every platform, upper load limit value and load lower limit obtain the maximum allocated coefficient of boiler described in every platform, comprising:
S121: based on the current loads of boiler described in every platform, upper load limit value and load lower limit, obtain the load that described in every platform, boiler is current and upwards regulate interval value Δ H and load to regulate interval value Δ L downwards;
S122: when the described changing value Δ T that exerts oneself is timing, the maximum allocated coefficient M of boiler described in every platform is the ratio that load upwards regulates interval value Δ H and the described changing value Δ T that exerts oneself;
When the described changing value Δ T that exerts oneself is for time negative, the maximum allocated coefficient M of boiler described in every platform is the ratio that load regulates the absolute value of interval value Δ L and the described changing value Δ T that exerts oneself downwards;
When described boiler exits female pipe universal time coordinated, the maximum allocated coefficient M of described boiler is zero.
4. the method for header system boiler coordination according to claim 1, it is characterized in that, the described described maximum allocated coefficient based on boiler described in every platform and allocation coefficient obtain final distribution coefficient, comprising:
S131: determine that any described boiler is target boiler successively, when the allocation coefficient of described target boiler is less than the maximum allocated coefficient of described target boiler, then the current distribution coefficient of described target boiler equals the allocation coefficient of described target boiler; When the allocation coefficient of described target boiler is more than or equal to the maximum allocated coefficient of described target boiler, then the current distribution coefficient of described target boiler equals the maximum allocated coefficient of described target boiler;
S132: if the current distribution coefficient sum of all boilers is less than 1, then the part less than 1 is supremum distribution coefficient, distributes to the boiler that current distribution coefficient is less than maximum allocated coefficient, obtains the final distribution coefficient of every platform boiler by described supremum distribution coefficient.
5. the method for header system boiler coordination according to claim 4, it is characterized in that, the described boiler described supremum distribution coefficient distributed to current distribution coefficient and be less than maximum allocated coefficient, obtains the final distribution coefficient of every platform boiler, comprising:
S1321: according to formula X
y=1-Σ X
ndetermine the supremum distribution coefficient X of current all boilers
y; Wherein, Σ X
nfor the current distribution coefficient sum of all boilers;
S1322: according to formula Δ X
n=X
ys
n/ (1-Σ S
z), obtain current distribution coefficient described in every platform be less than the boiler of maximum allocated coefficient distribute the coefficient delta X of acquisition
n, and by current distribution coefficient X
nwith the coefficient delta X of described acquisition
nbe added and obtain new current distribution coefficient;
Wherein, n is the sequence number of boiler, X
yfor the supremum distribution coefficient of current all boilers, S
nbe the allocation coefficient of n-th boiler, Σ S
zfor all current distribution coefficients are more than or equal to the described allocation coefficient sum of the boiler of maximum allocated coefficient;
S1323: when the described current distribution coefficient newly of described boiler is greater than maximum allocated coefficient described in it, the current distribution coefficient of described boiler equals maximum allocated coefficient described in it; When the described current distribution coefficient newly of described boiler is less than or equal to maximum allocated coefficient described in it, the current distribution coefficient of described boiler equals current distribution coefficient new described in it;
S1324: if the current distribution coefficient sum of all boilers is less than 1, then return step S1321; If the current distribution coefficient sum of all boilers equals 1, then the described final distribution coefficient that described in every platform, the current distribution coefficient of boiler is boiler described in every platform.
6. the method coordinated of header system boiler according to claim 5, is characterized in that, describedly obtains the actual Load adjustment amount of boiler described in every platform by the described final distribution coefficient of boiler described in changing value and every platform of exerting oneself, and comprising:
According to formula Δ F
n=Δ T*X
n, obtain the actual Load adjustment amount of boiler described in every platform;
Wherein, X
nbe the final distribution coefficient of n-th boiler, Δ T is changing value of exerting oneself, Δ F
nthe actual Load adjustment amount of n-th boiler.
7. the method coordinated of header system boiler according to claim 6, is characterized in that, described in obtain actual Load adjustment amount after, also comprise:
When working for multiple stage steam turbine is corresponding with multiple stage boiler, according to every platform, the actual Load adjustment of boiler each steam turbine corresponding measures the total load adjustment amount Σ Δ F of every platform boiler
n, formula is:
ΣΔF
n＝ΔT
1*X
n1+ΔT
2*X
n2+···+ΔT
i*X
ni；
Wherein, i is steam turbine sequence number, and n is boiler sequence number, Δ T
ibe the changing value of exerting oneself of i-th steam turbine, X
niit is the final distribution coefficient of corresponding i-th steam turbine of n-th boiler;
According to formula F
n=F
n'+∑ Δ F
n, obtain the absolute load instruction F of every platform boiler
n;
Wherein, F
nbe the absolute load instruction of n-th boiler, F
n' be the absolute load instruction of one-period on n-th boiler, Σ Δ F
nit is n-th this cycle of boiler total load adjustment amount.
8. a coherent system for header system boiler, is characterized in that, comprising:
Acquisition module (1), for the current loads of the changing value of exerting oneself of Real-time Obtaining steam turbine, every platform boiler, upper load limit value and load lower limit;
Forward allocator module (2), drag losses value for corresponding to every platform boiler based on described steam turbine obtains the allocation coefficient of the optimum that described in every platform, boiler is corresponding, and obtains the maximum allocated coefficient of boiler described in every platform based on the current loads of boiler described in described changing value of exerting oneself, every platform, upper load limit value and load lower limit;
Recurrence distribution module (3), for obtaining final distribution coefficient based on the described maximum allocated coefficient of boiler described in every platform and allocation coefficient, and the described final distribution coefficient of boiler described in changing value and every platform of exerting oneself described in passing through obtains the actual Load adjustment amount of boiler described in every platform.
9. the coherent system of header system boiler according to claim 8, is characterized in that, described forward allocator module (2) is also for according to formula K=8 λ l/ (π
2gd
5) calculate the drag losses value K of boiler described in every platform, and for based on the described drag losses value principle contrary with the variation tendency of described allocation coefficient, obtain the allocation coefficient of boiler described in every platform, the allocation coefficient sum of all described boilers is 1;
Wherein, λ is viscosity coefficient, and l is duct length, and g is acceleration of gravity, and d is pipe diameter.
10. the coherent system of header system boiler according to claim 9, is characterized in that, described forward allocator module (2) also comprises:
Obtaining subelement, upwards regulating interval value Δ H and load to regulate interval value Δ L downwards for obtaining the current load of every platform boiler based on the current loads of boiler described in every platform, upper load limit value and load lower limit;
Computation subunit, for obtaining the maximum allocated coefficient of boiler described in every platform.
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| CN105276562B (en) | 2017-11-03 |
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