CN113283121B - Flow and capacity design method and system for molten salt heat storage industrial steam supply system - Google Patents
Flow and capacity design method and system for molten salt heat storage industrial steam supply system Download PDFInfo
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Abstract
The invention discloses a flow and capacity design method and a system of a molten salt heat storage industrial steam supply system, wherein boundary parameters are determined according to average depth peak shaving electrical load rate, duration and external steam supply load statistic of an industrial steam supply power station in the last natural year; and then obtaining the correlation characteristic of electric output, steam supply load and unit energy efficiency of the industrial steam supply power station in the current steam supply mode by a performance test means, calculating the difference value of the steam supply capacity and the target steam supply load of the industrial steam supply power station at the deep peak regulation period, and designing the capacity of the molten salt heat storage device and a process system by respectively taking the margin of x according to the difference value and the duration. The invention accords with the actual engineering field, is suitable for the demonstration of the flexible heat and electricity supply transformation scheme of the industrial steam supply power station, and has wide application prospect.
Description
Technical Field
The invention belongs to the field of heat storage system flow and capacity design, and relates to a flow and capacity design method and system for a molten salt heat storage industrial steam supply system.
Background
With the gradual advance of the double-carbon strategy, the transformation and upgrade speed of the electric energy structure is accelerated, and renewable energy sources with time-varying characteristics such as wind and light are rapidly developed and become main sources of electric energy. The traditional thermal power optimization self-positioning is changed from an electric quantity main body to a comprehensive service main body which undertakes power grid voltage stabilization, peak shaving, frequency modulation, bottom supporting and power conservation and the like, and the high-proportion consumption of new energy electric power is promoted; meanwhile, with the continuous promotion of industrialization and urbanization processes, the demand of concentrated medium heat such as industrial steam and resident heating is rapidly increased. In 2015 to 2020, the wind-light installed ratio is increased to 24.31% from 11.3%, the thermal power is decreased to 49.07% from 65.9%, the average utilization hours are decreased to 7.3%, the central heating area is increased to 37.6%, and the thermal power generating unit is required to develop towards a direction with a large thermal power ratio and high flexibility.
The heat-supply and heat-supply integrated type solar energy heat-collecting and heat-collecting system is comprehensively influenced by factors such as climatic geographic conditions, industrial structures and the like, some regions mainly use resident heating for concentrated heat utilization, and other regions mainly use industrial steam supply. Unlike heating by residents in the form of hot water, industrial steam supply is influenced by production process, production characteristics, pipeline length and the like, and parameters (pressure, temperature and flow) of industrial steam supply power stations have large differences and are basically not influenced by regional conditions. However, industrial steam supply stations also need to participate in deep peak shaving of power grids, but existing thermoelectric decoupling technologies of cogeneration units, such as low-pressure cylinder zero output, high-low pressure bypass, hot water heat storage, electrode heat storage boilers and the like, are all suitable for residential heating units, and the heat and power conservation and regulation requirements of industrial steam supply stations are not available for reference.
The molten salt is a heat transfer and storage medium with excellent performance, is particularly suitable for high-temperature conditions, and has been widely applied to the fields of solar photo-thermal power generation and high-temperature industrial heating. The fused salt heat storage is applied to the wide-load industrial steam supply of the coal-electric machine set, and related researches are carried out.
Reference 1 luohihua, zhanghoulei, etc. A subcritical thermal power generating unit industrial heat supply peak regulation technology [ J ] based on molten salt heat storage, a heating ventilation air conditioner, 2020 regulation, and provides a set of molten salt heat storage system based on subcritical thermal power generating unit industrial heat supply peak regulation. Thermal analysis shows that the fused salt heat accumulation and release system can be matched with parameters of a thermal system of the thermal power generating unit, and thermoelectric decoupling of the thermal power generating unit is realized.
Related documents are comprehensively analyzed, the existing research is focused on the contents of thermal system performance modeling, energy consumption change, change of a heat-electricity operation domain and the like of a fused salt heat storage system coupled coal-electricity unit, and the capacity design of the heat storage system under the heat preservation and peak regulation requirements of an industrial steam supply power station is rarely related.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a flow and capacity design method and system for a molten salt heat storage industrial steam supply system.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a flow and capacity design method for a molten salt heat storage industrial steam supply system comprises the following steps:
step 1, counting daily average depth peak-regulation electric load rate alpha, duration t and external steam supply load Q of the last natural year of the industrial steam supply power station g ；
The method is further improved in that:
the daily average depth peak-to-peak electrical load rate alpha of the last natural year is as follows:
in the formula, t is the total number of depth peak-shaving hours of a certain natural day, and i is the ith depth peak-shaving small time period; n is a radical of hydrogen ge,i Average electric output of the ith depth peak shaving small period of a certain natural day; m is the natural days of the industrial steam supply power station participating in deep peak shaving in the last natural year, and j is the jth deep peak shaving natural day; n is a radical of ge,d The electric power is output for the nameplate of the industrial steam supply power station;
the daily average depth peak shaver hour total t of the last natural year is as follows:
in the formula, t j The number of depth peak-shaving hours in the jth natural day participating in the depth peak-shaving;
external steam supply load Q g The following were used:
in the formula, Q g,i And the average steam supply load of the ith depth peak regulation small time period of a certain natural day.
The statistics is carried out according to the operation hour rounding and the operation day rounding, the normal operation of the unit is less than one hour or less than one natural day, and relevant data are not taken into account.
The electrical output N ge -steam supply load Q-correlation characteristic of unit energy efficiency characteristic B is obtained according to the following method:
through field performance test, the external steam supply load Q of the industrial steam supply power station is obtained along with the electric output N ge The associated characteristics of (a) are as follows:
Q＝{0,Q max }＝{0,f 1 (N ge )} (4)
in the formula, Q max ＝f 1 (N ge ) The maximum steam supply load under the power output is obtained;
forGiven the electric power output, the external steam supply load Q of the industrial steam supply power station is 0 and Q max The distance between the two parts is adjustable;
obtaining the electric output N of the industrial steam supply power station through field performance test ge The steam supply load Q-the associated characteristic of the unit energy efficiency characteristic B is as follows:
B＝F 1 (Q,N ge ) (5)
wherein, F 1 Electric output N for industrial steam supply power station ge -steam supply load Q-correlation of the unit energy efficiency characteristic B.
The process is designed according to the following method:
when the industrial steam supply power station adopts a mode of extracting steam at a certain position in thermodynamic cycle and supplying the steam externally to meet external requirements, the steam is introduced from a hot re-steam pipeline from the outlet of the boiler to the inlet of the intermediate pressure cylinder, enters an industrial steam supply header through a valve group and is supplied externally; when the low-electric load hot reheat pressure is insufficient, the steam is throttled by the steam inlet regulating valve in front of the inlet of the intermediate pressure cylinder so as to improve the hot reheat pressure and the external steam supply flow;
in a high-power load section, when the heat re-extraction of the industrial steam supply power station has a margin after external steam supply, extracting heat re-extraction steam as a heat source of the molten salt heat storage system; after being pressurized by a low-temperature molten salt booster pump, the low-temperature molten salt at the outlet of the low-temperature molten salt storage tank enters a low-temperature molten salt heat absorber to be heated by hot re-steam, and the heated high-temperature molten salt enters a high-temperature molten salt storage tank to be stored; the hot re-steam is condensed into hydrophobic water after being released by the low-temperature molten salt heat absorber and enters a deaerator; the heat storage process is carried out, at the moment, the high-temperature molten salt booster pump and the booster pump for steam supply stop running, and the valve group is closed; emptying the low-temperature molten salt in the low-temperature molten salt storage tank, fully storing the high-temperature molten salt in the high-temperature molten salt storage tank, and finishing the heat storage process;
in the low-electricity load interval of the industrial steam supply power station, when the steam extraction external supply mode at a certain position of the thermodynamic cycle does not meet the external requirement, the molten salt heat storage system enters a heat release state to supplement the industrial steam supply; the valve group is opened, water is taken from the outlet of the preposed pump and enters the high-temperature molten salt heat radiator after being pressurized by the booster pump for steam supply; the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank enters a high-temperature molten salt heat radiator after being pressurized by a high-temperature molten salt booster pump; in the high-temperature molten salt heat radiator, the high-temperature molten salt heats the outlet feed water of the preposed pump to an overheated steam state with the external required temperature, and then the high-temperature molten salt enters the industrial steam supply header and is supplied to the outside; the booster pump for steam supply is configured by electric frequency conversion, and the operation frequency is adjusted according to the difference value of the external industrial steam supply demand pressure and the outlet water supply pressure of the preposed pump so as to control the external steam supply pressure.
The capacity is designed according to the following method:
determining the electrical load alpha multiplied by N under the deep peak regulation state of the industrial steam supply power station according to the formula (4) ge,d Maximum steam supply load Q α ；
Calculating target steam supply load Q under deep peak regulation state g And actual capacity Q of unit α Difference Δ Q of (d):
ΔQ＝Q g -Q α (6)
according to the duration t, respectively taking x allowance according to the steam supply load delta Q of the heat storage system and the running time of a complete storage-heat release period, carrying out capacity design on the molten salt heat storage industrial steam supply system, and using the total capacity M in the molten salt storage tank msa For characterization, see formula (7); the maximum external steam supply load of the molten salt heat storage industrial steam supply system is characterized by (1 + x) multiplied by delta Q;
in the formula, h g 、h gs 、h hsa 、h csa Respectively providing an industrial steam supply enthalpy value, a preposed pump outlet feed water enthalpy value, a high-temperature molten salt storage device outlet molten salt enthalpy value and a low-temperature molten salt storage device inlet molten salt enthalpy value; eta st A capacity coefficient of the molten salt storage device for ensuring the safe and stable operation of the device;
the heat loss caused by heat dissipation in a complete cycle of self heat storage-heat release of the molten salt heat storage system is calculated by a coefficient eta em Characterization, heat source steam flow m rh The following:
m rh ×(h rh -h ss )＝m msa ×(h hsa -h csa )×(1+η em ) (8)
as being (1+x) x m rh 、M msa 、(1+x)×m msa And designing equipment and a pipeline system of the molten salt heat storage system according to flow, steam and molten salt working medium parameters, wherein x is a margin coefficient obtained when the capacity and the running time of the molten salt heat storage system are designed in consideration of further reduction of deep peak load regulation electric load rate and further increase of daily average deep peak regulation time of the coal-fired industrial steam supply power station caused by installation of renewable energy sources such as wind, light and the like and further acceleration of generated energy increment.
The method for determining the residue coefficient x is as follows:
the average utilization hour data H of the renewable energy sources such as wind and light of the power grid of the coal-fired industrial steam supply power station in nearly five years is taken 1 、H 2 、H 3 、H 4 、H 5 (ii) a The average utilization hour number increase rate y is calculated according to equation (9):
calculating the unit deep peak-shaving electrical load N of the fourth year according to the formula (10) by taking the current year with the added molten salt heat storage system as a reference year and counting the deep peak-shaving load rate and the duration increment of the three years ge-f ：
N ge-f ＝α×N ge-d ×(1-y) 3 (10)
Calculating the peak-adjusting electric load alpha multiplied by N of the reference year depth according to the formula (4) ge,d And the unit deep peak regulation electric load N of the fourth year ge-f Maximum steam supply capacity difference value delta Q y And calculating a residue coefficient x:
a flow and capacity design system of a molten salt heat storage industrial steam supply system comprises:
the data statistics module is used for counting the daily average depth peak-modulated electrical load rate alpha and the continuous peak-modulated electrical load rate alpha of the last natural year of the industrial steam supply power stationTime t and external steam supply load Q g ；
The correlation characteristic calculation module obtains the electric output N of the industrial steam supply power station adopting the current steam supply mode through a performance test ge -steam supply load Q-correlation characteristic of unit energy efficiency characteristic B;
a flow and capacity design module for adjusting peak electric load rate alpha, duration t and external steam supply load Q according to the average daily depth of the last natural year g And the electric output N of the current steam supply mode ge Designing the flow and the capacity of the molten salt heat storage industrial steam supply system according to the correlation characteristics of the steam supply load Q and the unit energy efficiency characteristic B.
A terminal device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, said processor implementing the steps of the method as described above when executing said computer program.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method as described above.
Compared with the prior art, the invention has the following beneficial effects:
according to the average depth peak shaving electrical load rate, the duration and the external steam supply load statistic value of the last natural year of the industrial steam supply power station, boundary parameters are determined; obtaining the correlation characteristic of electric output, steam supply load and unit energy efficiency of the industrial steam supply power station in the current steam supply mode by a performance test means, and calculating the difference value between the steam supply capacity and the target steam supply load of the industrial steam supply power station at the deep peak regulation period; and (4) designing the capacity of the molten salt heat storage device and a process system by taking x allowance of the steam supply capacity difference and the duration time. The invention accords with the actual engineering field, is suitable for the demonstration of the flexible heat and electricity supply transformation scheme of the industrial steam supply power station, and has wide application prospect.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a flow and capacity design method of a molten salt heat storage industrial steam supply system.
Fig. 2 is a structural diagram of a molten salt heat storage industrial steam supply system of the invention.
Wherein: the system comprises a boiler 1, a boiler 2, a high-pressure cylinder 3, an intermediate pressure cylinder 4, a low-pressure cylinder 5, a condenser 6, a condensate pump 7, a low-pressure heater group 8, a deaerator 9, a pre-pump 10, a water feed pump 11, a high-pressure heater group 12, a high-temperature molten salt storage tank 13, a high-temperature molten salt booster pump 14, a high-temperature molten salt heat radiator 15, a low-temperature molten salt storage tank 16, a low-temperature molten salt booster pump 17, a low-temperature molten salt heat absorber 18, a booster pump for steam supply 19, an industrial steam supply header 19, a steam inlet regulating valve 20 and a valve group 21-23.
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 and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which the product of the present invention is used to usually place, it is only for convenience of describing the present invention and simplifying the description, but it is not necessary to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the embodiment of the invention discloses a flow and capacity design method of a molten salt heat storage industrial steam supply system, which comprises the following steps:
step 1, basic data statistics and arrangement. Counting the daily average depth peak-regulation electrical load rate alpha, the duration t and the external steam supply load Q of the last natural year of the industrial steam supply power station g 。
And counting according to the rounding of the operation hours and the rounding of the operation days, wherein the normal operation of the unit is less than one hour or less than one natural day, and relevant data are not taken into account.
The daily average depth peak-regulation electrical load rate alpha in the last natural year is shown as formula (1).
In the formula, t is the total number of depth peak-shaving hours of a certain natural day, and i is the ith depth peak-shaving small time interval. N is a radical of ge,i The average electrical output, MW, for the ith depth peak shaver hours of a natural day.
m is the natural days of the industrial steam supply power station participating in deep peak regulation in the last natural year, and j is the natural days of each deep peak regulation of the jth. N is a radical of ge,d And the electric power output of the nameplate of the industrial steam supply power station is MW.
The average daily depth peak-shaving hours of the last natural year, t, is shown in formula (2).
In the formula, t j The number of depth peaking hours in the jth natural day participating in the depth peaking.
External steam supply load Q g The determination is made in accordance with equation (3).
In the formula, Q g,i And (4) average steam supply load t/h of the ith depth peak regulation small time period of a certain natural day.
Industrial steam supply station in power output N ge And to the outsideUnder the condition of electric heating double supply of the steam supply load Q, the total amount of fuel consumed by the unit can reflect the overall energy efficiency of the thermodynamic cycle so as to indicate the coal consumption B.
Obtaining the external steam supply load Q of the industrial steam supply power station along with the electric output N through the technical means of field performance test ge See equation (4).
Q＝{0,Q max }＝{0,f 1 (N ge )} (4)
In the formula, Q max ＝f 1 (N ge ) The maximum steam supply load under the power output is t/h.
For a given power output, the load Q of the industrial steam supply station to the external steam supply is between 0 and Q max Can be adjusted.
Obtaining the electric output N of the industrial steam supply power station by the technical means of field performance test ge -steam supply load Q-associated characteristic of unit energy efficiency characteristic B, see equation (5).
B＝F 1 (Q,N ge ) (5)
And 3, designing the flow and the capacity of the molten salt heat storage industrial steam supply system.
1) Flow design
As shown in fig. 2, when the industrial steam supply power station adopts a mode of extracting steam from a certain position in thermodynamic cycle to supply the steam to the outside to meet the external requirement, the steam is introduced from a hot re-steam pipeline from an outlet of a boiler 1 to an inlet of an intermediate pressure cylinder 3, enters an industrial steam supply header 19 through a valve group 22 and is supplied to the outside. When the low electric load hot reheat steam pressure is insufficient, the steam is throttled by the steam inlet regulating valve 20 in front of the inlet of the intermediate pressure cylinder 3, so that the hot reheat steam pressure and the external steam supply flow are improved.
In the high-power load section, when the heat re-extraction of the industrial steam supply power station has a margin after external steam supply, the heat re-extraction steam is extracted to be used as a heat source of the molten salt heat storage system. The low-temperature molten salt at the outlet of the low-temperature molten salt storage tank 15 is pressurized by a low-temperature molten salt booster pump 16, enters a low-temperature molten salt heat absorber 17 and is heated by hot re-steam, and the heated high-temperature molten salt enters the high-temperature molten salt storage tank 12 for storage. The hot re-steam is condensed into hydrophobic water after being released by the low-temperature molten salt heat absorber 17 and enters the deaerator 8. In this case, the operation of the high-temperature molten salt booster pump 13 and the booster pump 18 for steam supply is stopped, and the valve group 23 is closed. And (4) emptying the low-temperature molten salt in the low-temperature molten salt storage tank 15, fully storing the high-temperature molten salt in the high-temperature molten salt storage tank 12, and finishing the heat storage process.
In the low-electricity load interval of the industrial steam supply power station, when the steam extraction external supply mode at a certain part of the thermodynamic cycle does not meet the external requirement, the fused salt heat storage system enters a heat release state to supplement the industrial steam supply. The valve group 23 is opened, water is taken from the outlet of the pre-pump 9, and enters the high-temperature molten salt heat radiator 14 after being pressurized by the booster pump 18 for steam supply. The high-temperature molten salt at the outlet of the high-temperature molten salt storage tank 13 enters the high-temperature molten salt heat radiator 14 after being pressurized by the high-temperature molten salt booster pump 13. In the high-temperature molten salt heat radiator 14, the high-temperature molten salt heats the feed water at the outlet of the pre-pump 9 to a superheated steam state with the external required temperature, and then the feed water enters the industrial steam supply header 19 and is supplied to the outside. The booster pump 18 for steam supply is configured by electric frequency conversion, and the operation frequency is adjusted according to the difference between the external industrial steam supply demand pressure and the water supply pressure at the outlet of the pre-pump 9 so as to control the external steam supply pressure.
2) Capacity design
Determining the electrical load alpha multiplied by N under the deep peak load regulation state of the industrial steam supply power station according to the formula (4) ge,d Maximum steam supply load Q α 。
Calculating target steam supply load Q under deep peak regulation state g And actual capacity Q of the unit α See equation (6).
ΔQ＝Q g -Q α (6)
According to the duration t, respectively taking allowance coefficients x according to the steam supply load delta Q of the heat storage system and the running time of a complete heat storage-release period, and carrying out capacity design on the industrial steam supply system of the molten salt heat storage according to the capacity sum M in the molten salt storage tank msa For characterization, see formula (7). The maximum external steam supply load of the molten salt heat storage industrial steam supply system is characterized by (1 + x) multiplied by delta Q.
In the formula, h g 、h gs 、h hsa 、h csa Are respectively provided withThe enthalpy value of industrial steam supply, the enthalpy value of water supply at the outlet of a preposed pump, the enthalpy value of fused salt at the outlet of a high-temperature fused salt storage device, and the enthalpy value of fused salt at the inlet of a low-temperature fused salt storage device are kJ/kg.
η st The capacity coefficient for the fused salt storage device to ensure the safe and stable operation of the device is provided by the fused salt storage device design manufacturer.
x is a margin coefficient obtained when the capacity and the running time of the molten salt heat storage system are designed in consideration of further reduction of the deep peak shaving electrical load rate of the coal-fired industrial steam supply power station and further increase of daily average deep peak shaving time caused by installation of renewable energy sources such as wind, light and the like and further increase of the generated energy increment, and the determination method is as follows:
the average utilization hour data H of the renewable energy sources such as wind and light of the power grid of the coal-fired industrial steam supply power station in nearly five years is taken 1 、H 2 、H 3 、H 4 、H 5 . The average number-of-hours-of-utilization increase rate y is calculated according to equation (8),
calculating the unit deep peak-shaving electrical load N of the fourth year according to the formula (9) by taking the current year with the added molten salt heat storage system as a reference year and counting the deep peak-shaving load rate and the duration increment of the three years ge-f ，
N ge-f ＝α×N ge-d ×(1-y) 3 (9)
Calculating the peak-adjusting electric load alpha multiplied by N of the reference year depth according to the formula (4) ge,d And the unit deep peak regulation electric load N of the fourth year ge-f Maximum steam supply capacity difference value delta Q y And the residue coefficient x is calculated, see equation (10).
The average utilization hour change comprehensively indicates the influence quantity of wind and light and other renewable energy sources installed and generated energy increment on the coal-fired unit, so that the allowance index provided by the invention has representativeness and site conformity.
In a complete storage-heat release period, the molten salt is used as a heat carrier, and in the time transfer process of transferring heat of the heat re-steam to the industrial steam supply, the working medium temperature of the molten salt storage device and the auxiliary system is far higher than the ambient temperature, so that heat dissipation loss is generated, and the coefficient eta is used em And (5) characterizing. Heat source steam flow m rh Calculated according to equation (11).
m rh ×(h rh -h ss )＝m msa ×(h hsa -h csa )×(1+η em ) (11)
h rh 、h ss Respectively is the enthalpy value of the hot re-steam entering the low-temperature molten salt heat absorber 17 and the hydrophobic enthalpy value of the low-temperature molten salt heat absorber 17, kJ/kg.
As (1 + x) x m rh 、M msa 、(1+x)×m msa Flow and working medium parameters such as steam and molten salt are adopted to design equipment and a pipeline system of the molten salt heat storage system.
The embodiment of the invention discloses terminal equipment, which comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the steps of the method are realized when the processor executes the computer program.
The embodiment of the invention provides terminal equipment. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. The processor realizes the steps of the above-mentioned method embodiments when executing the computer program. Alternatively, the processor implements the functions of the modules/units in the above device embodiments when executing the computer program.
The computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention.
The terminal device can be a desktop computer, a notebook, a palm computer, a cloud server and other computing devices. The terminal device may include, but is not limited to, a processor, a memory.
The processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.
The memory may be used for storing the computer programs and/or modules, and the processor may implement various functions of the terminal device by executing or executing the computer programs and/or modules stored in the memory and calling data stored in the memory.
The embodiment of the invention discloses a computer readable storage medium, which stores a computer program, and is characterized in that the computer program realizes the steps of the method when being executed by a processor.
The modules/units integrated in the terminal device may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media may not include electrical carrier signals or telecommunication signals in accordance with legislation and patent practice.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A flow and capacity design method for a molten salt heat storage industrial steam supply system is characterized by comprising the following steps:
step 1, counting the average daily depth peak-regulation electric load rate alpha, the duration t and the external steam supply load Q of the last natural year of the industrial steam supply power station g ；
Step 2, obtaining the electric output N of the industrial steam supply power station adopting the current steam supply mode through a performance test ge -steam supply load Q-correlation characteristic of unit energy efficiency characteristic B;
step 3, adjusting peak electric load rate alpha, duration t and external steam supply load Q according to the daily average depth of the last natural year g And the electric output N of the current steam supply mode ge Designing the flow and the capacity of the molten salt heat storage industrial steam supply system according to the correlation characteristics of the steam supply load Q and the unit energy efficiency characteristic B;
the daily average depth peak-to-peak electrical load rate α of the last natural year is as follows:
in the formula, i is the ith depth peak regulation small time period; n is a radical of ge,i Average electric output of the ith depth peak shaving small period of a certain natural day; m is the latest one of industrial steam supply power stationsNatural days participating in deep peak regulation in the year, wherein j is the jth deep peak regulation natural day; n is a radical of ge,d The electric power is output for the nameplate of the industrial steam supply power station;
daily average depth peak regulation hour total t of the last natural year ave-d The following were used:
in the formula, t j The number of depth peak-shaving hours in the jth natural day participating in the depth peak-shaving;
external steam supply load Q g The following:
in the formula, Q g,i Average steam supply load of the ith depth peak regulation small time period of a certain natural day;
the statistics is carried out according to the operation hour rounding and the operation day rounding, the unit normally operates for less than one hour or less than one natural day, and relevant data are not taken into account;
the electrical output N ge -steam supply load Q-correlation characteristic of unit energy efficiency characteristic B is obtained according to the following method:
through field performance test, the external steam supply load Q of the industrial steam supply power station is obtained along with the electric output N ge The associated characteristics of (a) are as follows:
Q＝{0,Q max }＝{0,f 1 (N ge )} (4)
in the formula, Q max ＝f 1 (N ge ) The maximum steam supply load under the power output is obtained;
for a given power output, the external steam supply load Q of the industrial steam supply station is between 0 and Q max The distance between the two parts is adjustable;
obtaining the electric output N of the industrial steam supply power station through field performance test ge -steam supply load Q-correlation characteristic of unit energy efficiency characteristic B as follows:
B＝F 1 (Q,N ge ) (5)
wherein, F 1 Electric output N for industrial steam supply power station ge -steam supply load Q-correlation of unit energy efficiency characteristic B;
the process is designed according to the following method:
when the industrial steam supply power station adopts a mode of extracting steam at a certain position in thermodynamic cycle and supplying the steam externally to meet external requirements, the steam is introduced from a hot re-steam pipeline from an outlet of the boiler (1) to the front of an inlet of the intermediate pressure cylinder (3) and enters an industrial steam supply header (19) through a valve group (22) and then is supplied externally; when the low-electric load hot reheat steam pressure is insufficient, throttling is carried out through a steam inlet regulating valve (20) in front of an inlet of the intermediate pressure cylinder (3) so as to improve the hot reheat steam pressure and the external steam supply flow;
in a high-power load section, when the heat re-extraction of the industrial steam supply power station has a margin after external steam supply, extracting heat re-extraction steam as a heat source of the molten salt heat storage system; after being pressurized by a low-temperature molten salt booster pump (16), the low-temperature molten salt at the outlet of the low-temperature molten salt storage tank (15) enters a low-temperature molten salt heat absorber (17) to be heated by hot re-steam, and the heated high-temperature molten salt enters a high-temperature molten salt storage tank (12) to be stored; the hot re-steam is condensed into hydrophobic water after being released by the low-temperature molten salt heat absorber (17), and enters the deaerator (8); the heat storage process is carried out, at the moment, the high-temperature molten salt booster pump (13) and the booster pump (18) for steam supply stop running, and the valve group (23) is closed; emptying the low-temperature molten salt in the low-temperature molten salt storage tank (15), fully storing the high-temperature molten salt in the high-temperature molten salt storage tank (12), and ending the heat storage process;
in the low-electricity load interval of the industrial steam supply power station, when the steam extraction external supply mode at a certain position of the thermodynamic cycle does not meet the external requirement, the molten salt heat storage system enters a heat release state to supplement the industrial steam supply; the valve group (23) is opened, water is taken from the outlet of the pre-pump (9), and enters the high-temperature molten salt heat radiator (14) after being pressurized by the steam supply booster pump (18); the high-temperature molten salt at the outlet of the high-temperature molten salt storage tank (12) is pressurized by a high-temperature molten salt booster pump (13) and then enters a high-temperature molten salt heat radiator (14); in the high-temperature molten salt heat radiator (14), the high-temperature molten salt heats the feed water at the outlet of the pre-pump (9) to an overheated steam state with an external required temperature, and the feed water enters the industrial steam supply header (19) and is supplied to the outside; the booster pump (18) for steam supply is in electric frequency conversion configuration, and the operation frequency is adjusted according to the difference between the external industrial steam supply demand pressure and the outlet water supply pressure of the front-mounted pump (9) so as to control the external steam supply pressure;
the capacity is designed according to the following method:
determining the electrical load alpha multiplied by N under the deep peak regulation state of the industrial steam supply power station according to the formula (4) ge,d Maximum steam supply load Q α ；
Calculating target steam supply load Q under deep peak regulation state g And actual capacity Q of unit α Difference Δ Q of (d):
ΔQ＝Q g -Q α (6)
according to the duration t, respectively taking x allowance according to the steam supply load delta Q of the heat storage system and the running time of a complete storage-heat release period, carrying out capacity design on the molten salt heat storage industrial steam supply system, and using the total capacity M in the molten salt storage tank msa For characterization, see formula (7); the maximum external steam supply load of the molten salt heat storage industrial steam supply system is characterized by (1 + x) multiplied by delta Q;
in the formula, h g 、h gs 、h hsa 、h csa Respectively obtaining an industrial steam supply enthalpy value, a pre-pump outlet feed water enthalpy value, a high-temperature molten salt storage device outlet molten salt enthalpy value and a low-temperature molten salt storage device inlet molten salt enthalpy value; eta st A capacity coefficient of the molten salt storage device for ensuring the safe and stable operation of the device;
the heat loss caused by heat dissipation in a complete cycle of self heat storage-heat release of the molten salt heat storage system is calculated by a coefficient eta em Characterization, heat source steam flow m rh The following:
m rh ×(h rh -h ss )＝m msa ×(h hsa -h csa )×(1+η em ) (8)
wherein h is rh 、h ss The enthalpy value of hot re-steam entering the low-temperature molten salt heat absorber (17) and the hydrophobic enthalpy value of the low-temperature molten salt heat absorber (17) are respectively;
as shown as (1 + x)m rh 、M msa 、(1+x)×m msa And designing equipment and a pipeline system of the molten salt heat storage system according to flow, steam and molten salt working medium parameters, wherein x is a margin coefficient obtained when the capacity and the running time of the molten salt heat storage system are designed according to the consideration that the deep peak shaving electrical load rate of the coal-fired industrial steam supply power station is further reduced and the daily average deep peak shaving time is further increased due to the fact that the renewable energy installation and the generated energy increment are further accelerated.
2. The flow and capacity design method of the molten salt heat storage industrial steam supply system according to claim 1, characterized in that the determination method of the margin coefficient x is as follows:
the average utilization hour data H of the renewable energy sources of the power grid of the coal-fired industrial steam supply power station in nearly five years is transferred 1 、H 2 、H 3 、H 4 、H 5 (ii) a The average number-of-hours-of-use increase rate y is calculated according to equation (9):
calculating the deep peak-shaving load rate and the duration increment of the unit in the fourth year according to the formula (10) by taking the current year with the additional molten salt heat storage system as a reference year and counting the deep peak-shaving load rate and the duration increment of the unit in the third year ge-f ：
N ge-f ＝α×N ge-d ×(1-y) 3 (10)
Calculating the reference year depth peak-regulation electrical load alpha multiplied by N according to the formula (4) ge,d And the unit deep peak regulation electric load N of the fourth year ge-f Maximum steam supply capacity difference value delta Q y And calculating a residue coefficient x:
3. a flow and capacity design system of a molten salt heat storage industrial steam supply system for realizing the design method of claim 1 or 2, which is characterized by comprising the following steps:
the data statistics module is used for counting the daily average depth peak-load regulation rate alpha, the duration t and the external steam supply load Q of the last natural year of the industrial steam supply power station g ；
The correlation characteristic calculation module obtains the electric output N of the industrial steam supply power station adopting the current steam supply mode through a performance test ge -steam supply load Q-correlation characteristic of unit energy efficiency characteristic B;
a flow and capacity design module for adjusting peak electric load rate alpha, duration t and external steam supply load Q according to the average daily depth of the last natural year g And the electric output N of the current steam supply mode ge Designing the flow and the capacity of the molten salt heat storage industrial steam supply system according to the correlation characteristics of the steam supply load Q and the unit energy efficiency characteristic B.
4. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the steps of the method according to claim 1 or 2 are implemented when the processor executes the computer program.
5. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to claim 1 or 2.
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| CN114234692A (en) * | 2021-12-14 | 2022-03-25 | 西安热工研究院有限公司 | Low-pressure steam supply system and method for reheating steam heat storage and peak shaving |
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Application publication date: 20210820 Assignee: Haimen Power Plant of Huaneng (Guangdong) Energy Development Co.,Ltd. Assignor: Xi'an Thermal Power Research Institute Co.,Ltd. Contract record no.: X2023980049189 Denomination of invention: A Process and Capacity Design Method and System for a Molten Salt Thermal Storage Industrial Steam Supply System Granted publication date: 20230224 License type: Common License Record date: 20231201 |
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Application publication date: 20210820 Assignee: Jining Huayuan Thermal Power Co.,Ltd. Assignor: Xi'an Thermal Power Research Institute Co.,Ltd. Contract record no.: X2023110000154 Denomination of invention: A Process and Capacity Design Method and System for a Molten Salt Thermal Storage Industrial Steam Supply System Granted publication date: 20230224 License type: Common License Record date: 20231218 |
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