CN109145420A - Pressure modeling method based on the isolation of steam-operating facilities air - Google Patents
Pressure modeling method based on the isolation of steam-operating facilities air Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000002955 isolation Methods 0.000 title claims abstract description 25
- 238000000605 extraction Methods 0.000 claims abstract description 42
- 239000013589 supplement Substances 0.000 claims abstract description 27
- 238000005070 sampling Methods 0.000 claims description 33
- 210000004907 gland Anatomy 0.000 claims description 29
- 238000004590 computer program Methods 0.000 claims description 5
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
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- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The embodiment of the present invention provides a kind of pressure modeling method based on the isolation of steam-operating facilities air, this method includes being based on gas utilization unit steam leakage flow amount model, packing balance cylinder steam leakage flow amount model, steam supply supplement discharge model and extraction flow obtain packing balance cylinder steam inside mass change, according to the relationship of quality of steam change rate and packing balance cylinder internal pressure change rate, establish packing balance cylinder internal pressure balance model, and parameter fitting is carried out according to packing balance cylinder internal pressure balance model, obtain the first leadage coefficient, second leadage coefficient, steam supply coefficient and extraction flow.Pressure modeling method provided in an embodiment of the present invention based on the isolation of steam-operating facilities air is using gas utilization unit steam leakage flow amount model, packing balance cylinder steam leakage flow amount model, steam supply supplement discharge model and extraction flow, obtain packing balance cylinder internal pressure balance model, method is simple, practical, accurate to obtain the variation of packing balance cylinder internal pressure in real time.
Description
Technical Field
The invention relates to the technical field of pressure modeling, in particular to a pressure modeling method based on pneumatic equipment air isolation.
Background
The steam equipment is the use equipment that equipment is inside to be full of steam, and it is generally used on steam equipment such as steam turbine, steam-driven pump and steam-driven boiler, but when using, the steam equipment makes outside air permeate inside the steam equipment through the equipment gap very easily to cause inside steam to mix in the air, destroy the vacuum, cause the condensate oxygen content to increase, corrode pipeline and equipment.
In the prior art, a steam seal balancing chamber for isolating air is generally additionally arranged outside a steam consuming device, the steam seal balancing chamber is filled with steam which is the same as that in the steam consuming device, a steam supply pipeline and a steam extraction pipeline are arranged on the steam seal balancing chamber, the pressure in the steam seal balancing chamber is adjusted by continuously supplying steam and extracting steam, the steam consuming device is influenced by the pressure, the steam in the steam consuming device is not leaked outwards or leaked as little as possible, and meanwhile, the external air is ensured not to permeate into the steam consuming device.
However, in the using process of the steam seal balancing chamber, steam in the steam cavity in the steam seal balancing chamber also leaks into the external atmospheric environment, so that the steam pressure in the steam seal balancing chamber is affected, therefore, under the condition that steam is leaked into the steam seal balancing chamber by the steam using equipment and the steam in the steam cavity in the steam seal balancing chamber also leaks into the external atmospheric environment, the steam pressure in the steam seal balancing chamber is controlled by performing steam supply and steam extraction operations on the steam seal balancing chamber, however, under the condition that the accurate change of the steam seal balancing chamber pressure cannot be obtained in real time, the accurate adjustment of the steam pressure in the steam seal balancing chamber cannot be ensured, but a method for accurately acquiring the real-time change of the steam pressure in the steam seal balancing chamber is not available in the prior art.
Disclosure of Invention
Aiming at the defects in the prior art in the background art, the invention provides a pressure modeling method based on pneumatic equipment air isolation.
In a first aspect, the present invention provides a pressure modeling method based on pneumatic equipment air isolation, including:
obtaining a steam leakage flow model of the steam equipment based on a first leakage coefficient of the steam equipment, the internal pressure of the steam equipment and the internal pressure of a steam seal balance chamber;
obtaining a steam leakage flow model of the steam seal balancing chamber based on a second leakage coefficient of the steam seal balancing chamber, the internal pressure of the steam seal balancing chamber and the standard atmospheric pressure;
obtaining a steam supply supplementary flow model according to the pressure of a steam supply main pipe, the pressure inside the steam seal balance chamber and a steam supply coefficient;
obtaining the steam quality change rate of the inside of the steam seal balance chamber based on the steam leakage flow model of the steam using equipment, the steam leakage flow model of the steam seal balance chamber, the steam supply supplement flow model and the steam extraction flow, establishing the pressure balance model of the inside of the steam seal balance chamber according to the relation between the steam quality change rate and the pressure change rate of the inside of the steam seal balance chamber, and performing parameter fitting according to the pressure balance model of the inside of the steam seal balance chamber to obtain the first leakage coefficient, the second leakage coefficient, the steam supply coefficient and the steam extraction flow.
In a second aspect, the present invention provides an electronic device, which includes a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the pressure modeling method based on air isolation of a pneumatic device according to the first aspect of the present invention.
In a third aspect, the invention provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the pressure modeling method based on the air isolation of a steam-operated device as provided in the first aspect of the invention.
The pressure modeling method based on the air isolation of the steam-operated equipment provided by the embodiment of the invention adopts the steam leakage flow model of the steam-operated equipment, the steam leakage flow model of the steam seal balance chamber, the steam supply supplement flow model and the steam extraction flow to obtain the internal pressure balance model of the steam seal balance chamber, the steam leakage position and the size of a leakage hole do not need to be measured, the internal pressure change of the steam seal balance chamber can be accurately obtained in real time, and the method is simple and practical.
Drawings
FIG. 1 is a schematic flow chart of a pressure modeling method based on pneumatic device air isolation according to an embodiment of the present invention;
fig. 2 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When the steam equipment with the steam seal balance chamber protection device is used, steam can be injected into the steam seal balance chamber, the pressure intensity inside the steam seal balance chamber is slightly greater than the pressure intensity inside the steam equipment and the standard atmospheric pressure of the external environment, the steam leakage inside the steam equipment into the steam seal balance chamber is reduced, the air of the steam equipment and the external environment is isolated, and therefore the phenomenon that the oxygen content of condensed water is increased and pipelines and equipment are corroded due to the fact that the air enters the steam equipment and is mixed into the steam is avoided.
However, when the steam equipment with the steam seal balance chamber protection device is used specifically, it is necessary to ensure that the internal pressure of the steam seal balance chamber is within a reasonable range, because the steam inside the steam equipment leaks into the steam seal balance chamber, the steam in the steam chamber of the steam seal balance chamber also leaks into the external atmospheric environment, so that the internal pressure of the steam seal balance chamber is always in a changing state, and the leakage flow rate during steam leakage is related to factors such as the number of steam leakage positions and the size of steam leakage holes besides the pressure difference, but there is no way to measure these factors, so that the changing state of the internal pressure of the steam seal balance chamber cannot be known.
In order to realize real-time accurate adjustment of the pressure inside the gland balance chamber, the change condition of the pressure inside the gland balance chamber needs to be mastered, so that a real-time, accurate and reliable basis is provided for further adjusting the pressure inside the gland balance chamber. However, in the prior art, there is no method for accurately acquiring the steam pressure change of the steam seal balance chamber, and the internal pressure change condition of the steam seal balance chamber cannot be accurately mastered, so that a pressure model algorithm is required, and the steam pressure change in the steam cavity in the steam seal balance chamber can be accurately acquired, so that a worker can conveniently adjust the steam supply amount and the steam extraction amount of the steam seal balance chamber according to the steam pressure change in the steam cavity in the steam seal balance chamber, and the purpose of protecting steam consumption equipment is achieved.
In order to accurately know the internal steam pressure change of the steam seal balance chamber, the embodiment of the invention provides a pressure modeling method based on air isolation of a steam-operated device, fig. 1 is a flow diagram of the pressure modeling method based on air isolation of the steam-operated device, and as shown in fig. 1, the method comprises the following steps:
step 10, obtaining a steam leakage flow model of the steam equipment based on a first leakage coefficient of the steam equipment, the internal pressure of the steam equipment and the internal pressure of a steam seal balance chamber;
step 11, obtaining a steam leakage flow model of the steam seal balance chamber based on a second leakage coefficient of the steam seal balance chamber, the internal pressure of the steam seal balance chamber and the standard atmospheric pressure;
step 12, obtaining a steam supply supplementary flow model according to the pressure intensity of the steam supply main pipe, the pressure intensity inside the steam seal balance chamber and the steam supply coefficient;
and step 13, obtaining the steam quality change rate of the inside of the steam seal balance chamber based on the steam leakage flow model of the steam using equipment, the steam leakage flow model of the steam seal balance chamber, the steam supply supplement flow model and the steam extraction flow, establishing the pressure balance model of the inside of the steam seal balance chamber according to the relation between the steam quality change rate and the pressure change rate of the inside of the steam seal balance chamber, and performing parameter fitting according to the pressure balance model of the inside of the steam seal balance chamber to obtain a first leakage coefficient, a second leakage coefficient, a steam supply coefficient and the steam extraction flow.
Specifically, a steam leakage flow model of the steam equipment is obtained through a first leakage coefficient of the steam equipment, the internal pressure of the steam equipment and the internal pressure of a gland balance chamber, and the model embodies the correlation among the first leakage coefficient of the steam equipment, the internal pressure of the gland balance chamber and the steam leakage flow of the steam equipment, wherein the steam leakage flow of the steam equipment is the leakage rate of steam in the steam equipment leaking into the gland balance chamber, and the first leakage coefficient of the steam equipment embodies the correlation among the steam leakage flow of the steam equipment, the internal pressure of the steam equipment and the internal pressure of the gland balance chamber;
similarly, a steam leakage flow model of the steam seal balancing chamber is obtained through a second leakage coefficient of the steam seal balancing chamber, the internal pressure of the steam seal balancing chamber and the standard atmospheric pressure, and the model embodies the correlation among the second leakage coefficient of the steam seal balancing chamber, the internal pressure of the steam seal balancing chamber and the steam leakage flow of the standard atmospheric pressure and the steam seal balancing chamber, wherein the steam leakage flow of the steam seal balancing chamber refers to the steam leakage rate of the steam in the steam seal balancing chamber leaking into the external atmospheric environment, and the second leakage coefficient of the steam seal balancing chamber embodies the correlation among the steam leakage flow of the steam seal balancing chamber, the internal pressure of the steam seal balancing chamber and the standard atmospheric pressure; obtaining a steam supply supplement flow model through the pressure intensity of the steam supply main pipe, the internal pressure intensity of the steam seal balance chamber and a steam supply coefficient, wherein the model embodies the mutual relation among the pressure intensity of the steam supply main pipe, the internal pressure intensity of the steam seal balance chamber, the steam supply coefficient and the steam supply supplement flow, and the steam supply coefficient embodies the relation among the steam supply supplement flow, the pressure intensity of the steam supply main pipe and the internal pressure intensity of the steam seal balance chamber;
the method comprises the steps of obtaining a steam quality change rate of the inside of a steam seal balance chamber through a steam leakage flow model of steam equipment, a steam leakage flow model of the steam seal balance chamber, a steam supply supplement flow model and a steam extraction flow, obtaining a pressure balance model of the inside of the steam seal balance chamber through the relation between the steam quality change rate and the pressure change rate of the inside of the steam seal balance chamber, performing parameter fitting according to the pressure balance model of the inside of the steam seal balance chamber to obtain a first leakage coefficient, a second leakage coefficient, a steam supply coefficient and a steam extraction flow, and finally obtaining the change of the pressure of the inside of the steam seal balance chamber through the first leakage coefficient, the second leakage coefficient, the steam supply coefficient, the steam extraction flow and the pressure balance model of the inside of the steam seal balance chamber.
The pressure modeling method based on the air isolation of the steam-operated equipment provided by the embodiment of the invention adopts the steam leakage flow model of the steam-operated equipment, the steam leakage flow model of the steam seal balance chamber, the steam supply supplement flow model and the steam extraction flow to obtain the internal pressure balance model of the steam seal balance chamber, the steam leakage position and the size of a leakage hole do not need to be measured, the internal pressure change of the steam seal balance chamber can be accurately obtained in real time, and the method is simple and practical.
On the basis of the above embodiment, the steam consumption device steam leakage flow model in the pressure modeling method based on the air isolation of the steam consumption device provided by the embodiment of the present invention specifically includes:
wherein Q iss,vFor steam leakage flow of steam-consuming apparatus, PsThe pressure inside the steam using equipment is shown as P, the pressure inside the steam seal balance chamber is shown as P, and α is a first leakage coefficient;
the steam leakage flow model of the steam seal balance chamber specifically comprises the following steps:
wherein Q isv,oThe steam leakage flow of the steam seal balance chamber, P is the internal pressure of the steam seal balance chamber, PoStandard atmospheric pressure, β a second leakage coefficient;
the steam supply supplement flow model specifically comprises the following steps:
wherein Q ise,vFor supplementary flow of steam, PeThe pressure of the steam supply main pipe is P, the pressure of the inside of the steam seal balance chamber is P, and the steam supply coefficient is delta. The steam leakage flow model, the steam leakage flow model of the steam seal balance chamber and the steam supply supplement flow model of the steam equipment are established through the proportional relation between the steam leakage flow and the pressure difference, the defects that the steam leakage position and the size of a leakage hole cannot be measured are overcome through correlation coefficients, the equipment characteristics of the determined steam equipment and the steam seal balance chamber are reflected, and therefore the accurate relation between the steam leakage flow or the steam supply supplement flow and the corresponding pressure difference is obtained.
According to the steam leakage flow model of the steam equipment, the first leakage coefficient of the steam equipment, the internal pressure of the steam equipment and the mutual relation between the internal pressure of the steam seal balance chamber and the steam leakage flow of the steam equipment are as follows: the steam leakage flow of the steam equipment is the square difference of two quantities, namely the internal pressure of the steam equipment and the internal pressure of a gland balance chamber, and the obtained value is multiplied by a first leakage coefficient of the steam equipment, and the obtained quantity is the steam leakage flow of the steam equipment; according to the steam leakage flow model of the steam seal balance chamber, the second leakage coefficient of the steam seal balance chamber, the internal pressure of the steam seal balance chamber, the standard atmospheric pressure and the steam leakage flow of the steam seal balance chamber have the following mutual relations: the steam leakage flow of the steam seal balancing chamber is the square difference of the two quantities of the internal pressure intensity and the standard atmospheric pressure of the steam seal balancing chamber, the square difference is then calculated, the obtained value is multiplied by a second leakage coefficient of the steam seal balancing chamber, and the obtained quantity is the steam leakage flow of the steam seal balancing chamber; according to the steam supply and supplement flow model, the mutual relationship among the pressure of the steam supply main pipe, the pressure inside the steam seal balance chamber, the steam supply coefficient and the steam supply and supplement flow is as follows: the steam supply supplement flow is the square difference of the two quantities of the pressure intensity of the steam supply main pipe and the pressure intensity inside the steam seal balance chamber, the obtained value is multiplied by a steam supply coefficient, the obtained quantity is the steam supply supplement flow, and a specific steam leakage flow model, a steam seal balance chamber steam leakage flow model and a steam supply supplement flow model of the steam consumption equipment are obtained.
On the basis of the above embodiments, the method for modeling pressure based on air isolation of steam-operated equipment according to the embodiments of the present invention obtains a change rate of steam quality inside a steam seal balance chamber based on a steam leakage flow model of steam-operated equipment, a steam leakage flow model of the steam seal balance chamber, a steam supply supplement flow model, and a steam extraction flow, and specifically includes:
through steam equipment steam leakage flow, vapor seal balance chamber steam leakage flow, steam supply supplementary flow and extraction flow, obtain the inside steam mass change rate of vapor seal balance chamber, wherein:
steam quality change rate inside the steam seal balance chamber:
wherein M is the steam quality inside the steam seal balance chamber, Qs,vFor steam leakage flow of steam-consuming apparatus, Qe,vFor supplementing flow for steam supply, Qv,oFor steam leakage flow of the gland balance chamber, Qv,cFor the flow of extracted steamAmount of the compound (A). Namely, the change rate of the steam quality inside the steam seal balance chamber is related to the steam leakage flow of the steam equipment, the steam leakage flow of the steam seal balance chamber, the steam supply supplement flow and the steam extraction flow, and the specific relationship is as follows: the steam quality change rate of the interior of the steam seal balance chamber is the sum of steam leakage flow of the steam equipment and steam supply supplement flow, the steam leakage flow of the steam seal balance chamber is subtracted, then the steam extraction flow is subtracted, and finally the obtained quantity is the steam quality change rate of the interior of the steam seal balance chamber, wherein the steam leakage flow of the steam equipment, the steam leakage flow of the steam seal balance chamber and the steam supply supplement flow are respectively a part of a relative flow model, so that the steam quality change rate of the interior of the steam seal balance chamber is obtained.
On the basis of the above embodiment, the relationship between the steam quality change rate and the pressure change rate inside the gland balance chamber in the pressure modeling method based on the air isolation of the steam-operated equipment provided by the embodiment of the present invention specifically includes:
wherein,to balance the rate of change of pressure inside the chamber,and P is the steam mass change rate, P is the internal pressure of the steam seal balance chamber, V is the volume of the steam seal balance chamber, R is a known coefficient, T is the steam temperature inside the steam seal balance chamber, and M is the steam mass inside the steam seal balance chamber. Namely, under the conditions that the volume of the steam seal balance chamber is constant, the temperature of steam inside the steam seal balance chamber is constant and the quality of the steam inside the steam seal balance chamber is constant, the pressure change rate inside the steam seal balance chamber is in direct proportion to the steam quality change rate.
On the basis of the above embodiment, in the pressure modeling method based on air isolation of the steam-operated device according to the embodiment of the present invention, the establishing of the internal pressure balance model of the steam seal balance chamber according to the relationship between the steam quality change rate and the internal pressure change rate of the steam seal balance chamber specifically includes:
establishing a pressure balance model inside the steam seal balance chamber through a formula five, a formula four, a formula one, a formula two and a formula three, wherein:
the pressure balance model in the steam seal balance chamber is as follows:
wherein P is the pressure inside the vapor seal balance chamber, V is the volume of the vapor seal balance chamber, R is a known coefficient, T is the vapor temperature inside the vapor seal balance chamber, M is the vapor quality inside the vapor seal balance chamber, P issFor the internal pressure, P, of the steam-consuming apparatuseFor pressure of steam supply main, PoIs at standard atmospheric pressure, Qv,cUnder the condition that the volume of the steam seal balancing chamber is constant, the temperature of steam inside the steam seal balancing chamber is constant, and the quality of steam inside the steam seal balancing chamber is constant, the finally obtained pressure change inside the steam seal balancing chamber is related to the first leakage coefficient, the second leakage coefficient, the steam supply coefficient, the steam extraction flow, the pressure inside the steam-using equipment, the pressure of a steam supply main pipe and the standard atmospheric pressure, under the condition that other variables are constant, the pressure change inside the steam seal balancing chamber is in direct proportion to the evolution of the square difference of the two quantities of the pressure inside the steam-using equipment and the pressure inside the steam seal balancing chamber, the pressure change inside the steam seal balancing chamber is in inverse proportion to the evolution of the square difference of the two quantities of the pressure inside the steam supply main pipe and the pressure inside the steam seal balancing chamber, the pressure change inside the steam seal balancing chamber is in inverse proportion to the evolution of the two quantities of the pressure inside the steam seal balancing chamber and the standard atmospheric pressure, and the pressure change inside the steam seal balancing chamber is in inverse proportion to the evolution of the other variables.
On the basis of the above embodiment, the pressure modeling method based on the pneumatic equipment air isolation provided by the embodiment of the present invention further includes: according to the internal pressure balance model of the steam seal balance chamber, obtaining the discretized internal discrete model of the steam seal balance chamber, wherein:
the discrete model of the interior of the steam seal balance chamber is as follows:
wherein: pnBalancing the pressure inside the chamber for the gland corresponding to the nth sampling pointn-1The pressure inside the steam seal balance chamber, P, corresponding to the sampling point at the (n-1) th times,n-1Internal pressure, P, of the steam consuming apparatus for the (n-1) th samplinge,n-1Pressure of steam supply main pipe for sampling at n-1o,n-1Is the standard atmospheric pressure of the (n-1) th sampling, tau is the sampling period, V is the volume of the steam seal balance chamber, R is the known coefficient, T is the steam temperature inside the steam seal balance chamber, M is the steam quality inside the steam seal balance chamber, Qv,cIs the extraction flow. Discretizing the pressure change inside the gland balance chamber, sampling the pressure inside the steam equipment once at intervals of tau with tau as a sampling period, and sampling for the (n-1) th time to obtain the pressure inside the steam equipment, namely Ps,n-1(ii) a Sampling the pressure of the steam supply main pipe once every interval time tau, and sampling for the (n-1) th time to obtain the pressure of the steam supply main pipe, namely Pe,n-1(ii) a Thus, PnNamely the pressure inside the corresponding vapor seal balance chamber when the nth sampling is carried out. Therefore, the internal pressure change of the steam seal balance chamber is reflected by the internal pressure difference of the steam seal balance chamber obtained by two adjacent sampling points spaced by one sampling period tau, and similarly, for other pressure quantities in the internal pressure balance model of the steam seal balance chamber, the pressure obtained by the corresponding sampling point in the sampling period is also adopted to reflect the pressure under the current state, so that the discretized internal pressure discrete model of the steam seal balance chamber after the discretization of the internal pressure balance model of the steam seal balance chamber is obtained, and the internal pressure change condition of the steam seal balance chamber is more accurately obtained.
On the basis of the above embodiment, the pressure modeling method based on the pneumatic equipment air isolation provided by the embodiment of the present invention further includes:
obtaining a first leakage coefficient, a second leakage coefficient, a steam supply coefficient and steam extraction flow through a discrete linear model; wherein: the discrete linear model is: y isn×1＝Xn×4θ4×1Wherein:
yn＝Pn-Pn-1；
wherein, PnBalancing the pressure inside the chamber for the gland corresponding to the nth sampling pointn-1The pressure inside the steam seal balance chamber, P, corresponding to the sampling point at the (n-1) th times,nInternal pressure, P, of the steam consuming apparatus for the nth samplinge,nPressure of steam supply main pipe for nth samplingo,nIs the standard atmospheric pressure of the nth sampling, tau is the sampling period, V is the volume of the vapor seal balance chamber, R is the known coefficient, T is the vapor temperature inside the vapor seal balance chamber, M is the vapor quality inside the vapor seal balance chamber, Qv,cThe relationship between the first leakage coefficient, the second leakage coefficient, the steam supply coefficient and the steam extraction flow rate and each discrete quantity can be obtained through the discrete linear model and each quantity in the model.
On the basis of the above embodiment, in the pressure modeling method based on the air isolation of the steam turbine equipment provided by the embodiment of the present invention, parameter fitting is performed according to a pressure balance model inside a steam seal balance chamber to obtain a first leakage coefficient, a second leakage coefficient, a steam supply coefficient, and a steam extraction flow rate, and specifically: and performing parameter fitting by a least square method to obtain a first leakage coefficient, a second leakage coefficient, a steam supply coefficient and steam extraction flow. According to the pressure balance model in the gland balance chamber, fitting operation is carried out through a least square method and a large amount of experimental data to obtain a first leakage coefficient, a second leakage coefficient, a steam supply coefficient and steam extraction flow, wherein the estimation model of the correlation coefficient is as follows:
the parameters involved in the estimation model are described in the above embodiments, and are not described herein again. Discretizing the pressure balance model inside the gland balance chamber to obtain a discretized discrete model inside the gland balance chamber in the embodiment, combining the discretized discrete model inside the gland balance chamber in the embodiment with each quantity value in the discretized discrete model, and obtaining X, Y quantity values through experimental sampling, wherein the sampling data can be 5000 groups or more, so that a first leakage coefficient, a second leakage coefficient, a steam supply coefficient and steam extraction flow obtained through real experimental data fitting are obtained.
An embodiment of the present invention further provides an electronic device, fig. 2 is a schematic physical structure diagram of the electronic device provided in the embodiment of the present invention, and as shown in fig. 2, the electronic device includes: a processor (processor)210, a communication Interface (communication Interface)220, a memory (memory)230 and a bus 240, wherein the processor 210, the communication Interface 220 and the memory 230 complete communication with each other through the bus 240. Processor 210 may call logic instructions in memory 230 to perform the following method: obtaining a steam leakage flow model of the steam equipment based on a first leakage coefficient of the steam equipment, the internal pressure of the steam equipment and the internal pressure of a steam seal balance chamber; obtaining a steam leakage flow model of the steam seal balancing chamber based on a second leakage coefficient of the steam seal balancing chamber, the internal pressure of the steam seal balancing chamber and the standard atmospheric pressure; obtaining a steam supply supplementary flow model according to the pressure of the steam supply main pipe, the pressure inside the steam seal balance chamber and the steam supply coefficient; the method comprises the steps of obtaining the change rate of the steam quality inside the steam seal balance chamber based on a steam leakage flow model of the steam equipment, the steam leakage flow model of the steam seal balance chamber, a steam supply supplement flow model and steam extraction flow, establishing a pressure balance model inside the steam seal balance chamber according to the relation between the change rate of the steam quality and the change rate of the pressure inside the steam seal balance chamber, and performing parameter fitting according to the pressure balance model inside the steam seal balance chamber to obtain a first leakage coefficient, a second leakage coefficient, a steam supply coefficient and steam extraction flow.
In addition, the logic instructions in the memory 230 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing computer instructions, which cause a computer to execute the method for pressure modeling based on air isolation of a steam turbine provided in the foregoing embodiments, for example, the method includes: obtaining a steam leakage flow model of the steam equipment based on a first leakage coefficient of the steam equipment, the internal pressure of the steam equipment and the internal pressure of a steam seal balance chamber; obtaining a steam leakage flow model of the steam seal balancing chamber based on a second leakage coefficient of the steam seal balancing chamber, the internal pressure of the steam seal balancing chamber and the standard atmospheric pressure; obtaining a steam supply supplementary flow model according to the pressure of the steam supply main pipe, the pressure inside the steam seal balance chamber and the steam supply coefficient; the method comprises the steps of obtaining the change rate of the steam quality inside the steam seal balance chamber based on a steam leakage flow model of the steam equipment, the steam leakage flow model of the steam seal balance chamber, a steam supply supplement flow model and steam extraction flow, establishing a pressure balance model inside the steam seal balance chamber according to the relation between the change rate of the steam quality and the change rate of the pressure inside the steam seal balance chamber, and performing parameter fitting according to the pressure balance model inside the steam seal balance chamber to obtain a first leakage coefficient, a second leakage coefficient, a steam supply coefficient and steam extraction flow.
Embodiments of the electronic device and non-transitory computer-readable storage medium of the present invention are specific flowcharts and details for implementing the above method embodiments, and are not described herein with reference to the above method embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A pressure modeling method based on pneumatic equipment air isolation is characterized by comprising the following steps:
obtaining a steam leakage flow model of the steam equipment based on a first leakage coefficient of the steam equipment, the internal pressure of the steam equipment and the internal pressure of a steam seal balance chamber;
obtaining a steam leakage flow model of the steam seal balancing chamber based on a second leakage coefficient of the steam seal balancing chamber, the internal pressure of the steam seal balancing chamber and the standard atmospheric pressure;
obtaining a steam supply supplementary flow model according to the pressure of a steam supply main pipe, the pressure inside the steam seal balance chamber and a steam supply coefficient;
obtaining the steam quality change rate of the inside of the steam seal balance chamber based on the steam leakage flow model of the steam using equipment, the steam leakage flow model of the steam seal balance chamber, the steam supply supplement flow model and the steam extraction flow, establishing the pressure balance model of the inside of the steam seal balance chamber according to the relation between the steam quality change rate and the pressure change rate of the inside of the steam seal balance chamber, and performing parameter fitting according to the pressure balance model of the inside of the steam seal balance chamber to obtain the first leakage coefficient, the second leakage coefficient, the steam supply coefficient and the steam extraction flow.
2. The method according to claim 1, characterized in that the steam consumption plant steam leakage flow model is specifically:
wherein Q iss,vFor the steam leakage flow of said steam consuming apparatus, PsThe pressure inside the steam consuming equipment is P, the pressure inside the steam seal balance chamber is P, and α is the first leakage coefficient;
the steam leakage flow model of the steam seal balance chamber specifically comprises the following steps:
wherein Q isv,oThe steam leakage flow of the steam seal balance chamber is P is the internal pressure of the steam seal balance chamber, P isoAt said standard atmospheric pressure, β is said second leakage factor;
the steam supply supplementary flow model specifically comprises the following steps:
wherein Q ise,vMake up flow for said steam supply, PeFor the steam supply assemblyThe pipe pressure, P is the pressure inside the gland balance chamber, and delta is the steam supply coefficient.
3. The method according to claim 2, wherein the obtaining of the change rate of the steam quality inside the steam seal balance chamber based on the steam consumption equipment steam leakage flow model, the steam seal balance chamber steam leakage flow model, the steam supply supplement flow model and the steam extraction flow specifically comprises:
obtaining the steam quality change rate of the inside of the steam seal balance chamber through the steam leakage flow of the steam equipment, the steam leakage flow of the steam seal balance chamber, the steam supply supplement flow and the steam extraction flow, wherein:
the steam quality change rate of the inside of the steam seal balance chamber is as follows:
wherein M is the steam quality inside the steam seal balance chamber, Qs,vFor the steam leakage flow of said steam-consuming apparatus, Qe,vSupply flow, Q, to the steamv,oFor the steam leakage flow of the gland balance chamber, Qv,cIs the extraction flow.
4. The method of claim 3, wherein the relationship between the rate of change of the vapor mass and the rate of change of the pressure inside the gland balance chamber is:
wherein,for the rate of change of pressure inside the gland balance chamber,and (3) for the steam mass change rate, P is the pressure inside the steam seal balance chamber, V is the volume of the steam seal balance chamber, R is a known coefficient, T is the steam temperature inside the steam seal balance chamber, and M is the steam mass inside the steam seal balance chamber.
5. The method according to claim 4, wherein the establishing a vapor seal balance chamber internal pressure balance model according to the relationship between the vapor quality change rate and the vapor seal balance chamber internal pressure change rate comprises:
establishing a pressure balance model inside the gland balance chamber through the formula five, the formula four, the formula one, the formula two and the formula three, wherein:
the internal pressure balance model of the gland balance chamber is as follows:
wherein P is the pressure inside the vapor seal balance chamber, V is the volume of the vapor seal balance chamber, R is a known coefficient, T is the vapor temperature inside the vapor seal balance chamber, M is the vapor quality inside the vapor seal balance chamber, P issFor the internal pressure, P, of the steam-consuming apparatuseFor the pressure of the steam supply main, PoIs said standard atmospheric pressure, Qv,cFor the extraction flow rate, α is the first leakage coefficient, δ is the steam supply coefficient, and β is the second leakage coefficient.
6. The method of claim 5, further comprising: according to the internal pressure balance model of the steam seal balance chamber, obtaining the discretized internal discrete model of the steam seal balance chamber, wherein:
the discrete model inside the gland seal balance chamber is as follows:
wherein: pnThe pressure inside the gland balance chamber, P, corresponding to the nth sampling pointn-1The pressure inside the gland balance chamber, P, corresponding to the sampling point at the (n-1) th times,n-1The pressure inside the steam using equipment, P, sampled for the (n-1) th timee,n-1Pressure of said supply manifold, P, sampled for the (n-1) th timeo,n-1The standard atmospheric pressure for the (n-1) th sampling, tau the sampling period, V the volume of the vapor seal balance chamber, R the known coefficient, T the vapor temperature inside the vapor seal balance chamber, M the vapor quality inside the vapor seal balance chamber, Qv,cIs the extraction flow.
7. The method of claim 6, further comprising:
obtaining the first leakage coefficient, the second leakage coefficient, the steam supply coefficient and the steam extraction flow through a discrete linear model; wherein: the discrete linear model is: y isn×1＝Xn×4θ4×1Wherein:
yn＝Pn-Pn-1；
wherein, PnThe pressure inside the gland balance chamber, P, corresponding to the nth sampling pointn-1The pressure inside the gland balance chamber, P, corresponding to the sampling point at the (n-1) th times,nThe pressure inside the steam consuming equipment, P, sampled for the nth timee,nThe pressure of the steam supply main pipe for the nth samplingo,nThe standard atmospheric pressure for the nth sampling, tau is the sampling period, and V is the vapor seal balance chamber volumeR is a known coefficient, T is the steam temperature inside the steam seal balance chamber, M is the steam quality inside the steam seal balance chamber, Qv,cFor the extraction flow rate, α is the first leakage coefficient, δ is the steam supply coefficient, and β is the second leakage coefficient.
8. The method according to claim 7, wherein the parameter fitting is performed according to the pressure balance model inside the gland balance chamber to obtain the first leakage coefficient, the second leakage coefficient, the steam supply coefficient and the steam extraction flow rate, specifically: and performing the parameter fitting by a least square method to obtain the first leakage coefficient, the second leakage coefficient, the steam supply coefficient and the steam extraction flow.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, carries out the steps of the method of pressure modeling based on pneumatic device air isolation according to any of claims 1 to 8.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, performs the steps of the method for pressure modeling based on pneumatic device air isolation of any of claims 1 to 8.
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| CN1519548A (en) * | 1997-05-26 | 2004-08-11 | Method and appts. for leak testing | |
| CN103335761A (en) * | 2013-06-03 | 2013-10-02 | 国家电网公司 | Method for evaluating influence of steam turbine flow passage grade movement gland sealing leakage on power loss of steam turbine |
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