CN113868783A - Method for determining running backpressure and minimum technical output characteristics of high-backpressure heat supply unit - Google Patents
Method for determining running backpressure and minimum technical output characteristics of high-backpressure heat supply unit Download PDFInfo
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Abstract
The invention is suitable for the technical field of heat supply, and provides a method for determining the running backpressure and minimum technical output characteristics of a high-backpressure heat supply unit. Wherein, the method comprises the following steps: obtaining design parameters of a high back pressure heat supply unit; acquiring operation condition parameters of a high-backpressure heat supply unit under a set electric load in a heating steam extraction zero-flow and pure high-backpressure heat supply state; setting electrical loads, and respectively calculating the highest operation backpressure of the high-backpressure heat supply unit under the plurality of electrical loads; and fitting and determining the characteristic relation between the running backpressure of the high-backpressure heat supply unit and the minimum technical output based on the highest running backpressure of the high-backpressure heat supply unit under a plurality of electrical loads. The invention converts the highest operation back pressure under each electric load into the characteristic relation between the operation back pressure and the minimum technical output, adjusts the operation back pressure of the high back pressure heat supply unit according to the characteristic relation, can accurately adjust the minimum technical output of the high back pressure heat supply unit, and improves the peak regulation operation capacity of the high back pressure heat supply unit.
Description
Technical Field
The invention belongs to the technical field of heat supply, and particularly relates to a method for determining the running backpressure and minimum technical output characteristics of a high-backpressure heat supply unit.
Background
At present, after a high-backpressure technology is transformed in a steam turbine of an existing heat supply unit, the minimum technical output of the unit during peak regulation operation is directly related to the backpressure of the unit during operation, and the higher the operating backpressure of the unit is, the higher the minimum technical output of the unit is, namely the worse the peak regulation performance of the unit is. Therefore, in order to improve the peak shaving performance of the unit, the flexible adjustment of the running backpressure is an effective means.
However, the correlation between the operating back pressure and the minimum technical output of the high back pressure heat supply unit under the low-load condition is not determined, so that it is difficult to effectively reduce the minimum technical output of the high back pressure heat supply unit by adjusting the operating back pressure.
Disclosure of Invention
In view of this, the present invention provides a method for determining an operating backpressure and a minimum technical output characteristic of a high-backpressure heat supply unit, so as to solve the problem of effectively reducing the minimum technical output of the high-backpressure heat supply unit by adjusting the operating backpressure.
The first aspect of the embodiment of the invention provides a method for determining the operating backpressure and the minimum technical output characteristic of a high-backpressure heat supply unit, which comprises the following steps:
obtaining design parameters of a high back pressure heat supply unit;
acquiring operation condition parameters of a high-backpressure heat supply unit under a set electric load in a heating steam extraction zero-flow and pure high-backpressure heat supply state;
calculating the highest operation backpressure of the high-backpressure heat supply unit under the current set electric load based on the design parameters and the operation condition parameters;
resetting the electrical load, and respectively calculating the highest operation backpressure of the high-backpressure heat supply unit under a plurality of electrical loads;
and fitting and determining the characteristic relation between the running backpressure of the high-backpressure heat supply unit and the minimum technical output based on the highest running backpressure of the high-backpressure heat supply unit under a plurality of electrical loads.
A second aspect of the embodiments of the present invention provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor, when executing the computer program, implements the steps of the method for determining the operating backpressure and minimum technical output characteristics of any high-backpressure heating unit.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the method for determining the operating backpressure and the minimum technical output characteristic of the high-backpressure heating unit are implemented.
Compared with the prior art, the invention has the following beneficial effects:
the method for determining the running backpressure and the minimum technical output characteristic of the high-backpressure heat supply unit comprises the following steps: obtaining design parameters of a high back pressure heat supply unit; acquiring operation condition parameters of a high-backpressure heat supply unit under a set electric load in a heating steam extraction zero-flow and pure high-backpressure heat supply state; calculating the highest operation backpressure of the high-backpressure heat supply unit under the current set electric load based on the design parameters and the operation condition parameters; resetting the electrical load, and respectively calculating the highest operation backpressure of the high-backpressure heat supply unit under a plurality of electrical loads; and fitting and determining the characteristic relation between the running backpressure of the high-backpressure heat supply unit and the minimum technical output based on the highest running backpressure of the high-backpressure heat supply unit under a plurality of electrical loads. The invention utilizes the characteristics that the minimum technical output in the high-backpressure heat supply unit is equal to the electric load and the running backpressure cannot be larger than the maximum running backpressure, converts the maximum running backpressure under each electric load into the characteristic relation between the running backpressure and the minimum technical output, and adjusts the running backpressure of the high-backpressure heat supply unit according to the characteristic relation, thereby realizing the accurate adjustment of the minimum technical output of the high-backpressure heat supply unit and better improving the peak regulation running capacity of the high-backpressure heat supply unit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart of an implementation of a method for determining an operating back pressure and a minimum technical output characteristic of a high back pressure heating unit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for determining an operating back pressure and a minimum technical output characteristic of a high-back-pressure heating unit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a terminal provided in an embodiment of the present invention;
fig. 4 is a schematic diagram of a characteristic curve obtained by the embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, it shows a flowchart of an implementation of the method for determining the operating back pressure and the minimum technical output characteristic of the high-back-pressure heating unit according to the embodiment of the present invention, where the method is applied to a terminal device, and the following is detailed:
and 101, obtaining design parameters of the high back pressure heat supply unit.
In the present embodiment, the power generation amount of the high back pressure heat supply unit changes with the change of the heat load. The design parameters of the high back pressure heat supply unit comprise inherent parameters of the high back pressure heat supply unit and operation parameters under the design working condition. The design parameters of the high back pressure heat supply unit can comprise low pressure cylinder efficiency under rated load working condition and minimum steam exhaust volume flow for ensuring safe operation of the last stage blade of the low pressure cylinder.
And 102, acquiring operation condition parameters of the high-backpressure heat supply unit under the set electric load in the heating steam extraction zero-flow and pure high-backpressure heat supply states.
In this embodiment, the operating condition parameters of the high back pressure heat supply unit include low pressure cylinder steam inlet flow, low pressure cylinder steam outlet flow, steam turbine back pressure, low pressure cylinder steam inlet temperature, and the like, where the unit of the low pressure cylinder steam inlet flow and the low pressure cylinder steam outlet flow is t/h, the unit of the steam turbine back pressure is kPa, the unit of the low pressure cylinder steam inlet pressure is MPa, and the unit of the low pressure cylinder steam inlet temperature is ℃. The terminal device can calculate the operating condition parameters of the high back pressure heat supply unit corresponding to the electric load in the heating steam extraction zero-flow and pure high back pressure heat supply states based on the design parameters of the high back pressure heat supply unit so as to obtain the operating condition parameters.
Optionally, step 102 includes:
and step 1021, acquiring low-pressure cylinder steam inlet flow, low-pressure cylinder steam inlet pressure and heating steam extraction zero flow of the high back pressure heat supply unit under the design rated load, and low-pressure cylinder steam inlet pressure under the pure high back pressure heat supply state.
In this embodiment, the data may be obtained through experimentation or collected at the site of the unit operation.
Step 1022, calculating the low-pressure cylinder steam inlet flow rate in the heating steam extraction zero flow and pure high back pressure heating state based on a preset steam inlet flow calculation formula, wherein the steam inlet flow calculation formula is as follows:
wherein FLPin represents the low-pressure cylinder steam inlet flow under the heating steam extraction zero flow and pure high back pressure heat supply state, pLPin represents the low-pressure cylinder steam inlet pressure under the heating steam extraction zero flow and pure high back pressure heat supply state, and FLPin represents the low-pressure cylinder steam inlet pressure under the heating steam extraction zero flow and pure high back pressure heat supply statedRepresents the low-pressure cylinder inlet steam flow rate under the designed rated load, pLPindRepresenting the low pressure cylinder inlet pressure at design rated load.
In this embodiment, the steam inlet flow of the low-pressure cylinder is in direct proportion to the steam inlet pressure of the low-pressure cylinder under the same working condition, the terminal device may calculate the ratio of the steam inlet flow of the low-pressure cylinder to the steam inlet pressure of the low-pressure cylinder based on the steam inlet flow of the low-pressure cylinder and the steam inlet pressure of the low-pressure cylinder under the designed rated load, and then calculate the steam inlet flow of the low-pressure cylinder under the heating steam extraction zero flow and pure high back pressure heating state based on the ratio and the steam inlet pressure of the low-pressure cylinder under the heating steam extraction zero flow and pure high back pressure heating state.
Step 1023, calculating the exhaust steam flow of the low-pressure cylinder in the heating extraction zero flow and pure high back pressure heating state based on a preset exhaust steam flow calculation formula, wherein the exhaust steam flow calculation formula is as follows:
wherein, FLPexh represents the low-pressure cylinder exhaust steam flow under the heating steam extraction zero flow and pure high back pressure heating state, and FLPexhdIndicating the low pressure cylinder exhaust flow at design rated load.
In this embodiment, on the basis of step 1022, the terminal device may calculate the low-pressure cylinder exhaust steam flow of the high-back-pressure heat supply unit in the heating extraction zero-flow state or the pure high-back-pressure heat supply state based on the ratio of the low-pressure cylinder exhaust steam flow to the low-pressure cylinder intake steam flow under the designed rated load.
And 103, calculating the highest operation backpressure of the high-backpressure heat supply unit under the current set electric load based on the design parameters and the operation condition parameters.
In this embodiment, the higher the operating backpressure of the high-backpressure heat supply unit is, the stronger the corresponding peak shaving capacity is, that is, the higher the power that can be output is. However, when the operating back pressure is too high, the parts of the steam turbine are subjected to large stress, which may affect the safety of the unit operation, so that the highest operating back pressure under each electric load needs to be determined. The highest operation backpressure can not be directly calculated, and the specific calculation method can be that an operation backpressure is set, a certain parameter under the set operation backpressure is calculated, and the calculated parameter is compared with the design parameter of the high back pressure heat supply unit, so that whether the set operation backpressure affects the operation safety of the unit or not is judged. In this embodiment, it is also necessary to ensure that the calculated maximum operating back pressure should not be greater than the rated maximum back pressure of the high back pressure unit.
Optionally, in step 103, the design parameters include minimum exhaust volume flow and low-pressure cylinder efficiency under the rated load condition; the operation condition parameters comprise low-pressure cylinder steam inlet pressure, low-pressure cylinder steam inlet temperature and low-pressure cylinder steam outlet flow.
Accordingly, step 103 includes:
and step 1031, calculating the current set electrical load of the high back pressure heat supply unit and the low pressure cylinder exhaust volume flow under the preset operation back pressure based on the low pressure cylinder efficiency, the heating extraction zero flow, the low pressure cylinder inlet pressure in the pure high back pressure heat supply state, the low pressure cylinder inlet temperature and the low pressure cylinder exhaust flow.
In this embodiment, the low-pressure cylinder exhaust volume flow is too low, which may affect the safe operation of the high-back-pressure heat supply unit, and the high-pressure cylinder exhaust volume flow indicates that the operation back pressure of the high-back-pressure heat supply unit may be further increased. Therefore, the terminal device calculates the set electric load and the low-pressure cylinder exhaust volume flow under the preset operation backpressure, compares the calculated low-pressure cylinder exhaust volume flow with the low-pressure cylinder exhaust volume flow which ensures the safe operation of the unit, and can judge whether the preset operation backpressure is the highest operation backpressure which ensures the safe operation of the unit.
Optionally, step 1031 includes:
and step 10311, calculating the current set electrical load of the high back pressure heat supply unit and the low pressure cylinder exhaust enthalpy value under the preset operation back pressure based on the low pressure cylinder efficiency, the heating extraction zero flow, the low pressure cylinder inlet pressure in the pure high back pressure heat supply state and the low pressure cylinder inlet temperature.
Optionally, step 10311 includes:
the method comprises the following steps of calculating the exhaust enthalpy value of a low-pressure cylinder of the high-back-pressure heat supply unit under the current set electric load and the preset operation back pressure based on a preset exhaust enthalpy value calculation formula, wherein the exhaust enthalpy value calculation formula is as follows:
the method comprises the following steps that hex0 represents a low-pressure cylinder exhaust steam enthalpy value, pexO represents preset operation back pressure, pLPin represents heating steam extraction zero flow and low-pressure cylinder steam inlet pressure in a pure high back pressure heat supply state, tLPin represents heating steam extraction zero flow and low-pressure cylinder steam inlet temperature in a pure high back pressure heat supply state, hpt (p, t) represents a steam-water characteristic function for solving a medium enthalpy value according to medium pressure and medium temperature, spt (p, t) represents a steam-water characteristic function for solving a medium entropy value according to the medium pressure and the medium temperature, hps (p, s) represents a steam-water characteristic function for solving the medium enthalpy value according to the medium pressure and the medium entropy value, and eta represents low-pressure cylinder efficiency under a rated load working condition.
In this embodiment, the exhaust enthalpy value of the low-pressure cylinder is used to calculate the specific exhaust volume of the low-pressure cylinder of the high-back-pressure heat supply unit under the current set electrical load and the preset operating back pressure.
And step 10312, calculating the specific volume of the low-pressure cylinder exhaust steam under the current set electrical load and the preset operation back pressure of the high-back-pressure heat supply unit based on the enthalpy value of the low-pressure cylinder exhaust steam.
Optionally, step 10312 includes:
calculating the steam exhaust specific volume of the high-back-pressure heat supply unit under the current set electric load and the preset operation back pressure based on a preset steam exhaust specific volume calculation formula, wherein the steam exhaust specific volume calculation formula is as follows:
vpex0＝vpx(pex0，xph(pex0，hex0))
wherein pex0 represents the preset operation back pressure, hex0 represents the steam discharge enthalpy value of the low-pressure cylinder, xph (p, h)) represents the steam-water characteristic function for solving the dryness of the medium according to the pressure and the enthalpy value of the medium, and vpx (p, x) represents the steam-water characteristic function for solving the specific volume of the medium according to the pressure and the dryness of the medium.
In the embodiment, the specific volume of the low-pressure cylinder exhaust steam is used for calculating the volume flow of the low-pressure cylinder exhaust steam by combining the enthalpy value of the low-pressure cylinder exhaust steam.
And step 10313, calculating the current set electric load of the high back pressure heat supply unit and the low pressure cylinder exhaust volume flow under the preset operation back pressure based on the heating extraction zero flow, the low pressure cylinder exhaust flow and the low pressure cylinder exhaust specific volume under the pure high back pressure heat supply state.
Optionally, step 10313 includes:
the method comprises the following steps of calculating the volume flow of the high-back-pressure heat supply unit exhausted steam of a low-pressure cylinder under the current set electric load and the preset operation back pressure based on a preset volume flow calculation formula, wherein the volume flow calculation formula is as follows:
Vex0＝FLPexh×1000×vpex0
wherein, Vex0 represents the low pressure jar volume flow of discharging of high back pressure heat supply unit under the electric load of current settlement and preset operating backpressure, and FLPexh represents the low pressure jar volume flow of discharging, and vpex0 represents the low pressure jar volume of discharging.
And step 1032, judging whether the low-pressure cylinder exhaust volume flow and the minimum exhaust volume flow meet preset safe operation conditions or not.
In this embodiment, the minimum exhaust volumetric flow rate may be a minimum exhaust volumetric flow rate that ensures safe operation of the last stage vane of the low pressure cylinder. If the current operation backpressure and the low-pressure cylinder exhaust volume flow corresponding to the electric load accord with the safe operation condition, the current operation backpressure is the highest operation backpressure meeting the safe operation of the high-backpressure heat supply unit under the current electric load.
Optionally, on the basis of any one of the embodiments, the safe operation condition is that an absolute value of a difference between the low-pressure cylinder exhaust volume flow and the minimum exhaust volume flow is smaller than a preset threshold.
In this embodiment, the preset threshold may be set to 0.001, and the smaller the threshold, the more accurate the calculated maximum operating backpressure. If the absolute value of the difference value between the exhaust volume flow of the low-pressure cylinder and the minimum exhaust volume flow is less than 0.001, the current operation backpressure is the highest operation backpressure meeting the safe operation of the high-backpressure heat supply unit under the current electric load; if the absolute value of the difference between the exhaust volume flow of the low-pressure cylinder and the minimum exhaust volume flow is not less than 0.001, the current operation back pressure is larger or smaller, and adjustment is needed.
And 1033, if the safety operation condition is not met, updating the preset operation backpressure based on a preset rule, and skipping to the step of calculating the current set electric load of the high back pressure heat supply unit and the low pressure cylinder exhaust volume flow under the preset operation backpressure based on the low pressure cylinder efficiency, the heating steam extraction zero flow, the low pressure cylinder steam inlet pressure in the pure high back pressure heat supply state, the low pressure cylinder steam inlet temperature and the low pressure cylinder exhaust flow.
Optionally, on the basis of any of the foregoing embodiments, updating the preset operating backpressure based on the preset rule includes:
and if the absolute value of the difference value between the low-pressure cylinder exhaust volume flow and the minimum exhaust volume flow is greater than the preset threshold value, and the low-pressure cylinder exhaust volume flow is greater than the minimum exhaust volume flow, increasing the preset operation back pressure by a preset value.
And if the absolute value of the difference value between the low-pressure cylinder exhaust volume flow and the minimum exhaust volume flow is greater than the preset threshold value, and the low-pressure cylinder exhaust volume flow is smaller than the minimum exhaust volume flow, reducing the preset running back pressure by a preset value.
In this embodiment, if the volume flow of the low-pressure cylinder exhaust steam corresponding to the current operating backpressure is greater than the minimum exhaust volume flow, it indicates that the preset operating backpressure is small, and the preset operating backpressure should be increased during adjustment; if the steam exhaust volume flow of the low-pressure cylinder corresponding to the current operation back pressure is smaller than the minimum steam exhaust volume flow, the preset operation back pressure is larger, and the preset operation back pressure is reduced during adjustment. The adjustment amount of the preset operation back pressure can also be determined according to the difference value between the exhaust volume flow of the low pressure cylinder and the minimum exhaust volume flow.
Step 1034, if the safe operation condition is met, determining the highest operation backpressure corresponding to the currently set electrical load as the preset operation backpressure.
In this embodiment, since the operating back pressure of the high back pressure unit cannot be greater than the rated maximum back pressure, the terminal device further needs to determine whether the maximum operating back pressure corresponding to the currently set electrical load is greater than the rated maximum back pressure of the high back pressure unit. If the maximum operation backpressure corresponding to the currently set electrical load is not greater than the preset operation backpressure, the maximum operation backpressure corresponding to the currently set electrical load is the current preset operation backpressure; and if the maximum running backpressure is larger than the preset maximum running backpressure, the maximum running backpressure corresponding to the current set electric load is the rated maximum backpressure of the high back pressure unit.
And 104, resetting the electrical loads, and respectively calculating the highest operation back pressure of the high back pressure heat supply unit under the plurality of electrical loads.
In this embodiment, in order to determine the highest operating backpressure of each electrical load, the terminal device needs to set a plurality of electrical loads, and calculate the highest operating backpressure of the high-backpressure heat supply unit under the plurality of electrical loads respectively. The set amount of electrical load should be such as to achieve a characteristic relationship between the electrical load and the highest operating back pressure.
And 105, fitting and determining the characteristic relation between the running back pressure of the high-back-pressure heat supply unit and the minimum technical output based on the highest running back pressure of the high-back-pressure heat supply unit under a plurality of electrical loads.
In this embodiment, based on the characteristics of the high back pressure heat supply unit, the electrical load of the high back pressure heat supply unit is the minimum technical output. Therefore, after the terminal device determines the characteristic relationship between the electrical load and the highest operation backpressure, the characteristic relationship is converted into the characteristic relationship between the highest operation backpressure and the electrical load, and the characteristic relationship between the operation backpressure and the minimum technical output is obtained.
Optionally, on the basis of any one of the above embodiments, fitting and determining the characteristic relationship between the operating backpressure of the high back pressure heat supply unit and the minimum technical output based on the highest operating backpressure of the high back pressure heat supply unit under multiple electrical loads includes:
and fitting the characteristic relation between the electric load and the highest operation back pressure based on the highest operation back pressure corresponding to each electric load.
And converting the characteristic relation between the electric load and the highest operation back pressure into the characteristic relation between the highest operation back pressure and the electric load.
And determining the characteristic relation between the operation back pressure and the minimum technical output based on the characteristic relation between the highest operation back pressure and the electrical load, wherein the operation back pressure is the highest operation back pressure value in the characteristic relation between the highest operation back pressure and the electrical load, and the minimum technical output is the electrical load value in the characteristic relation between the highest operation back pressure and the electrical load.
In this embodiment, after converting the characteristic relationship between the electrical load and the maximum operating back pressure into the characteristic relationship between the maximum operating back pressure and the electrical load, the terminal device may obtain a characteristic relationship expression between the maximum operating back pressure and the electrical load, or obtain a characteristic relationship curve between the maximum operating back pressure and the electrical load as shown in fig. 4. The characteristic relationship curve represents the minimum technical output corresponding to each highest operation backpressure, the abscissa in fig. 4 is the operation backpressure, the ordinate is the minimum technical output, and the abscissa in fig. 4, which is lower than the highest operation backpressure, is the range in which the operation backpressure can take values.
According to the invention, firstly, the design parameters of the high back pressure heat supply unit are obtained; acquiring operation condition parameters of a high-backpressure heat supply unit under a set electric load in a heating steam extraction zero-flow and pure high-backpressure heat supply state; then calculating the highest operation back pressure of the high back pressure heat supply unit under the current set electric load based on the design parameters and the operation condition parameters; resetting the electrical load, and respectively calculating the highest operation backpressure of the high-backpressure heat supply unit under a plurality of electrical loads; and finally, fitting and determining the characteristic relation between the running backpressure of the high-backpressure heat supply unit and the minimum technical output based on the highest running backpressure of the high-backpressure heat supply unit under a plurality of electrical loads. The invention utilizes the characteristics that the minimum technical output in the high-backpressure heat supply unit is equal to the electric load and the running backpressure cannot be larger than the maximum running backpressure, converts the maximum running backpressure under each electric load into the characteristic relation between the running backpressure and the minimum technical output, and adjusts the running backpressure of the high-backpressure heat supply unit according to the characteristic relation, thereby realizing the accurate adjustment of the minimum technical output of the high-backpressure heat supply unit and better improving the peak regulation running capacity of the high-backpressure heat supply unit.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 2 is a schematic structural diagram illustrating a device for determining an operating back pressure and a minimum technical output characteristic of a high-back-pressure heating unit according to an embodiment of the present invention, where for convenience of description, only parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as shown in fig. 2, the device 2 for determining the operating back pressure and minimum technical output characteristics of the high-back-pressure heating unit comprises:
the first obtaining module 21 is configured to obtain design parameters of the high back pressure heat supply unit.
And a second obtaining module 22, configured to obtain an operation condition parameter of the high back pressure heat supply unit under the set electrical load when the heating extraction zero-flow and pure high back pressure heat supply states are performed.
And the backpressure calculating module 23 is used for calculating the highest operation backpressure of the high backpressure heat supply unit under the current set electric load based on the design parameters and the operation condition parameters.
And the load adjusting module 24 is configured to reset the electrical loads, and calculate the highest operating backpressure of the high-backpressure heat supply unit under multiple electrical loads respectively.
And the characteristic fitting module 25 is used for fitting and determining the characteristic relation between the running backpressure of the high-backpressure heat supply unit and the minimum technical output based on the highest running backpressure of the high-backpressure heat supply unit under a plurality of electrical loads.
Optionally, the second obtaining module 22 includes:
the system comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring low-pressure cylinder steam inlet flow of a high-backpressure heat supply unit under a designed rated load, low-pressure cylinder steam inlet pressure and heating steam extraction zero flow under the designed rated load and low-pressure cylinder steam inlet pressure under a pure high-backpressure heat supply state;
the first calculation unit is used for calculating the steam inlet flow of the low-pressure cylinder in the heating extraction zero-flow and pure high-back-pressure heating states based on a preset steam inlet flow calculation formula, wherein the steam inlet flow calculation formula is as follows:
wherein FLPin represents the low-pressure cylinder steam inlet flow under the heating steam extraction zero flow and pure high back pressure heat supply state, pLPin represents the low-pressure cylinder steam inlet pressure under the heating steam extraction zero flow and pure high back pressure heat supply state, and FLPin represents the low-pressure cylinder steam inlet pressure under the heating steam extraction zero flow and pure high back pressure heat supply statedRepresents the low-pressure cylinder inlet steam flow rate under the designed rated load, pLPindRepresenting the inlet pressure of the low-pressure cylinder under the designed rated load;
the second calculation unit is used for calculating the exhaust steam flow of the low-pressure cylinder under the heating extraction zero flow and pure high back pressure heating state based on a preset exhaust steam flow calculation formula, and the exhaust steam flow calculation formula is as follows:
wherein, FLPexh represents the low-pressure cylinder exhaust steam flow under the heating steam extraction zero flow and pure high back pressure heating state, and FLPexhdIndicating the low pressure cylinder exhaust flow at design rated load.
Optionally, the design parameters include minimum exhaust volume flow and low-pressure cylinder efficiency under a rated load working condition; the operation condition parameters comprise low-pressure cylinder steam inlet pressure, low-pressure cylinder steam inlet temperature and low-pressure cylinder steam outlet flow;
accordingly, the back pressure calculation module 23 includes:
the low-pressure cylinder steam exhaust volume flow calculation unit is used for calculating the current set electric load of the high-back-pressure heat supply unit and the low-pressure cylinder steam exhaust volume flow under the preset operation back pressure based on the low-pressure cylinder efficiency, the heating steam extraction zero flow, the low-pressure cylinder steam inlet pressure in the pure high-back-pressure heat supply state, the low-pressure cylinder steam inlet temperature and the low-pressure cylinder steam exhaust flow;
the safe operation condition judging unit is used for judging whether the exhaust volume flow of the low-pressure cylinder and the minimum exhaust volume flow meet the preset safe operation condition or not;
the skipping unit is used for updating the preset running backpressure based on a preset rule when the safe running condition is not met, and skipping to the step of calculating the current set electric load of the high back pressure heat supply unit and the low pressure cylinder exhaust volume flow under the preset running backpressure based on the low pressure cylinder efficiency, the heating steam extraction zero flow, the low pressure cylinder steam inlet pressure in the pure high back pressure heat supply state, the low pressure cylinder steam inlet temperature and the low pressure cylinder exhaust flow;
and the determining unit is used for determining the highest operation back pressure corresponding to the currently set electric load as the preset operation back pressure when the safe operation condition is met.
Optionally, the low-pressure cylinder exhaust volume flow calculating unit:
the low-pressure cylinder exhaust steam enthalpy value calculating subunit is used for calculating the low-pressure cylinder exhaust steam enthalpy value of the high-back-pressure heat supply unit under the current set electric load and the preset operation back pressure based on the low-pressure cylinder efficiency, the heating extraction zero flow, the low-pressure cylinder inlet steam pressure in the pure high-back-pressure heat supply state and the low-pressure cylinder inlet steam temperature;
the low-pressure cylinder steam exhaust specific volume calculating subunit is used for calculating the steam exhaust specific volume of the low-pressure cylinder under the current set electric load and the preset operation back pressure of the high-back-pressure heat supply unit based on the steam exhaust enthalpy value of the low-pressure cylinder;
and the operator unit of the low-pressure cylinder exhaust volume flow meter is used for calculating the current set electric load of the high-back-pressure heat supply unit and the low-pressure cylinder exhaust volume flow under the preset operation back pressure based on the heating exhaust zero flow, the low-pressure cylinder exhaust flow in the pure high-back-pressure heat supply state and the low-pressure cylinder exhaust specific volume.
Optionally, the operator unit for the exhaust enthalpy value of the low pressure cylinder is specifically configured to:
the method comprises the following steps of calculating the exhaust enthalpy value of a low-pressure cylinder of the high-back-pressure heat supply unit under the current set electric load and the preset operation back pressure based on a preset exhaust enthalpy value calculation formula, wherein the exhaust enthalpy value calculation formula is as follows:
the method comprises the following steps that hex0 represents a low-pressure cylinder exhaust enthalpy value, pex0 represents preset operation back pressure, pLPin represents low-pressure cylinder steam inlet pressure in a heating steam extraction zero flow and pure high back pressure heat supply state, tLPin represents low-pressure cylinder steam inlet temperature in the heating steam extraction zero flow and pure high back pressure heat supply state, hpt (p, t) represents a steam-water characteristic function for solving a medium enthalpy value according to medium pressure and medium temperature, spt (p, t) represents a steam-water characteristic function for solving a medium entropy value according to the medium pressure and the medium temperature, hps (p, s) represents a steam-water characteristic function for solving the medium enthalpy value according to the medium pressure and the medium entropy value, and eta LP represents low-pressure cylinder efficiency under a rated load working condition.
Optionally, the low-pressure cylinder exhaust specific volume calculation subunit is specifically configured to:
calculating the steam exhaust specific volume of the high-back-pressure heat supply unit under the current set electric load and the preset operation back pressure based on a preset steam exhaust specific volume calculation formula, wherein the steam exhaust specific volume calculation formula is as follows:
vpex0＝vpx(pex0，xph(pex0，hex0))
wherein pex0 represents the preset operation back pressure, hex0 represents the steam discharge enthalpy value of the low-pressure cylinder, xph (p, h)) represents the steam-water characteristic function for solving the dryness of the medium according to the pressure and the enthalpy value of the medium, and vpx (p, x) represents the steam-water characteristic function for solving the specific volume of the medium according to the pressure and the dryness of the medium;
optionally, the operator unit of the low-pressure cylinder exhaust steam volume flow meter is specifically configured to:
the method comprises the following steps of calculating the volume flow of the high-back-pressure heat supply unit exhausted steam of a low-pressure cylinder under the current set electric load and the preset operation back pressure based on a preset volume flow calculation formula, wherein the volume flow calculation formula is as follows:
Vex0＝FLPexh×1000×vpex0
wherein, Vex0 represents the low pressure jar volume flow of discharging of high back pressure heat supply unit under the electric load of current settlement and preset operating backpressure, and FLPexh represents the low pressure jar volume flow of discharging, and vpex0 represents the low pressure jar volume of discharging.
Optionally, on the basis of any of the above embodiments, the safe operation condition is that an absolute value of a difference between the exhaust volume flow of the low pressure cylinder and the minimum exhaust volume flow is smaller than a preset threshold;
optionally, on the basis of any of the above embodiments, the jumping unit is specifically configured to:
when the absolute value of the difference value between the low-pressure cylinder exhaust volume flow and the minimum exhaust volume flow is larger than a preset threshold value, and the low-pressure cylinder exhaust volume flow is larger than the minimum exhaust volume flow, increasing the preset operation back pressure by a preset value;
and when the absolute value of the difference value between the low-pressure cylinder exhaust volume flow and the minimum exhaust volume flow is greater than a preset threshold value and the low-pressure cylinder exhaust volume flow is less than the minimum exhaust volume flow, reducing the preset operation backpressure by a preset value.
Optionally, on the basis of any of the above embodiments, the characteristic fitting module 25 is specifically configured to:
fitting a characteristic relation between the electrical load and the highest operation backpressure based on the highest operation backpressure corresponding to each electrical load;
converting the characteristic relation between the electric load and the highest operation backpressure into the characteristic relation between the highest operation backpressure and the electric load;
and determining the characteristic relation between the operation back pressure and the minimum technical output based on the characteristic relation between the highest operation back pressure and the electrical load, wherein the operation back pressure is the highest operation back pressure value in the characteristic relation between the highest operation back pressure and the electrical load, and the minimum technical output is the electrical load value in the characteristic relation between the highest operation back pressure and the electrical load.
According to the invention, firstly, the design parameters of the high back pressure heat supply unit are obtained; acquiring operation condition parameters of a high-backpressure heat supply unit under a set electric load in a heating steam extraction zero-flow and pure high-backpressure heat supply state; then calculating the highest operation back pressure of the high back pressure heat supply unit under the current set electric load based on the design parameters and the operation condition parameters; resetting the electrical load, and respectively calculating the highest operation backpressure of the high-backpressure heat supply unit under a plurality of electrical loads; and finally, fitting and determining the characteristic relation between the running backpressure of the high-backpressure heat supply unit and the minimum technical output based on the highest running backpressure of the high-backpressure heat supply unit under a plurality of electrical loads. The invention utilizes the characteristics that the minimum technical output in the high-backpressure heat supply unit is equal to the electric load and the running backpressure cannot be larger than the maximum running backpressure, converts the maximum running backpressure under each electric load into the characteristic relation between the running backpressure and the minimum technical output, and adjusts the running backpressure of the high-backpressure heat supply unit according to the characteristic relation, thereby realizing the accurate adjustment of the minimum technical output of the high-backpressure heat supply unit and better improving the peak regulation running capacity of the high-backpressure heat supply unit.
Fig. 3 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 3, the terminal 3 of this embodiment includes: a processor 30, a memory 31 and a computer program 32 stored in said memory 31 and executable on said processor 30. The processor 30, when executing the computer program 32, implements the steps in the above-mentioned method embodiments for determining the back pressure and the minimum technical output characteristic of the high back pressure heating unit, such as the steps 101 to 103 shown in fig. 1. Alternatively, the processor 30, when executing the computer program 32, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the units 21 to 23 shown in fig. 2.
Illustratively, the computer program 32 may be partitioned into one or more modules/units that are stored in the memory 31 and executed by the processor 30 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 32 in the terminal 3.
The terminal 3 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal may include, but is not limited to, a processor 30, a memory 31. It will be appreciated by those skilled in the art that fig. 3 is only an example of a terminal 3 and does not constitute a limitation of the terminal 3 and may comprise more or less components than those shown, or some components may be combined, or different components, e.g. the terminal may further comprise input output devices, network access devices, buses, etc.
The Processor 30 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 31 may be an internal storage unit of the terminal 3, such as a hard disk or a memory of the terminal 3. The memory 31 may also be an external storage device of the terminal 3, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like provided on the terminal 3. Further, the memory 31 may also include both an internal storage unit and an external storage device of the terminal 3. The memory 31 is used for storing the computer program and other programs and data required by the terminal. The memory 31 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. 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, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; 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; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method for determining the running backpressure and the minimum technical output characteristic of a high-backpressure heat supply unit is characterized by comprising the following steps of:
obtaining design parameters of a high back pressure heat supply unit;
acquiring operation condition parameters of a high-backpressure heat supply unit under a set electric load in a heating steam extraction zero-flow and pure high-backpressure heat supply state;
calculating the highest operation back pressure of the high back pressure heat supply unit under the current set electric load based on the design parameters and the operation condition parameters;
resetting the electrical load, and respectively calculating the highest operation backpressure of the high-backpressure heat supply unit under a plurality of electrical loads;
and fitting and determining the characteristic relation between the running backpressure of the high-backpressure heat supply unit and the minimum technical output based on the highest running backpressure of the high-backpressure heat supply unit under a plurality of electrical loads.
2. The method of claim 1, wherein the design parameters include minimum exhaust volumetric flow and low cylinder efficiency at rated load; the operating condition parameters comprise low-pressure cylinder steam inlet pressure, low-pressure cylinder steam inlet temperature and low-pressure cylinder steam outlet flow;
correspondingly, the calculating the highest operation backpressure of the high-backpressure heat supply unit under the current set electric load based on the design parameters and the operation condition parameters comprises:
calculating the current set electric load of the high back pressure heat supply unit and the low pressure cylinder steam exhaust volume flow under the preset operation back pressure based on the low pressure cylinder efficiency, the heating steam extraction zero flow, the low pressure cylinder steam inlet pressure in the pure high back pressure heat supply state, the low pressure cylinder steam inlet temperature and the low pressure cylinder steam exhaust flow;
judging whether the exhaust volume flow of the low-pressure cylinder and the minimum exhaust volume flow meet preset safe operation conditions or not;
if the running condition is not met, updating the preset running backpressure based on a preset rule, and skipping to the step of calculating the current set electric load of the high back pressure heat supply unit and the low pressure cylinder exhaust volume flow under the preset running backpressure based on the low pressure cylinder efficiency, the heating exhaust zero flow, the low pressure cylinder inlet pressure in the pure high back pressure heat supply state, the low pressure cylinder inlet temperature and the low pressure cylinder exhaust flow;
and if the safety operation condition is met, determining the highest operation back pressure corresponding to the currently set electric load as the preset operation back pressure.
3. The method for determining the operating backpressure and minimum technical output characteristic of the high-backpressure heat supply unit according to claim 2, wherein the step of obtaining the operating condition parameters of the high-backpressure heat supply unit under the set electric load in the heating steam extraction zero-flow and pure high-backpressure heat supply states comprises the following steps:
acquiring the low-pressure cylinder steam inlet flow, the low-pressure cylinder steam inlet pressure and the heating steam extraction zero flow of the high back pressure heat supply unit under the design rated load, and the low-pressure cylinder steam inlet pressure under the pure high back pressure heat supply state;
the method comprises the following steps of calculating the low-pressure cylinder steam inlet flow under the conditions of zero heating steam extraction flow and pure high back pressure heat supply based on a preset steam inlet flow calculation formula, wherein the steam inlet flow calculation formula is as follows:
wherein FLPin represents the heating steam extraction zero flow and pure high back pressure heating stateThe lower low-pressure cylinder steam inlet flow, pLPin represents the low-pressure cylinder steam inlet pressure in the heating steam extraction zero flow and pure high back pressure heat supply state, FLPindRepresents the low-pressure cylinder inlet steam flow rate under the designed rated load, pLPindRepresenting the inlet pressure of the low-pressure cylinder under the designed rated load;
calculating the exhaust flow of the low-pressure cylinder under the heating extraction zero flow and pure high back pressure heating state based on a preset exhaust flow calculation formula, wherein the exhaust flow calculation formula is as follows:
wherein, FLPexh represents the low-pressure cylinder exhaust steam flow under the heating steam extraction zero flow and pure high back pressure heating state, and FLPexhdIndicating the low pressure cylinder exhaust flow at design rated load.
4. The method of claim 2, wherein the calculating the current set electrical load of the high back pressure heat supply unit and the volume flow of the low pressure cylinder exhaust steam at the preset operating back pressure based on the low pressure cylinder efficiency, the zero heating steam extraction flow, the low pressure cylinder steam inlet pressure in the pure high back pressure heat supply state, the low pressure cylinder steam inlet temperature and the low pressure cylinder exhaust steam flow comprises:
calculating the current set electrical load of the high back pressure heat supply unit and the low pressure cylinder steam exhaust enthalpy value under the preset operation back pressure based on the low pressure cylinder efficiency, the heating steam extraction zero flow, the low pressure cylinder steam inlet pressure in the pure high back pressure heat supply state and the low pressure cylinder steam inlet temperature;
calculating the current set electrical load of the high back pressure heat supply unit and the specific volume of the low pressure cylinder exhaust steam under the preset operation back pressure based on the low pressure cylinder exhaust steam enthalpy value;
and calculating the current set electric load of the high back pressure heat supply unit and the low pressure cylinder steam exhaust volume flow under the preset operation back pressure based on the heating steam extraction zero flow, the low pressure cylinder steam exhaust flow under the pure high back pressure heat supply state and the low pressure cylinder steam exhaust specific volume.
5. The method of claim 4, wherein the calculating the enthalpy value of the low-pressure cylinder exhaust steam of the high-back-pressure heat supply unit under the current set electrical load and the preset operating back pressure based on the low-pressure cylinder efficiency, the zero heating steam extraction flow, the low-pressure cylinder inlet steam pressure in the pure high-back-pressure heat supply state, and the low-pressure cylinder inlet steam temperature comprises:
calculating the exhaust enthalpy value of the low-pressure cylinder of the high-back-pressure heat supply unit under the current set electric load and the preset operation back pressure based on a preset exhaust enthalpy value calculation formula, wherein the exhaust enthalpy value calculation formula is as follows:
the device comprises a low-pressure cylinder, a high-pressure cylinder, a medium, a high-pressure cylinder, a low-pressure cylinder, a pex0, a pex0, a pLPin, a hpt (p, t), an spt (p, t), an hps (p, s), a low-pressure cylinder, a pex (p, p.
6. The method for determining the operating backpressure and minimum technical output characteristic of a high-backpressure heating unit according to claim 4, wherein the calculating the specific volume of the low-pressure cylinder exhaust steam of the high-backpressure heating unit under the current set electric load and the preset operating backpressure based on the enthalpy value of the low-pressure cylinder exhaust steam comprises:
calculating the current set electric load of the high back pressure heat supply unit and the steam exhaust specific volume of the low pressure cylinder under the preset operation back pressure based on a preset steam exhaust specific volume calculation formula, wherein the steam exhaust specific volume calculation formula is as follows:
vpex0＝vpx(pex0，xph(pex0，hex0))
wherein pex0 represents the preset operation back pressure, hex0 represents the exhaust steam enthalpy value of the low pressure cylinder, xph (p, h)) represents a steam-water characteristic function for solving the dryness of the medium according to the pressure and the enthalpy value of the medium, and vpx (p, x) represents a steam-water characteristic function for solving the specific volume of the medium according to the pressure and the dryness of the medium;
based on the low pressure jar exhaust steam flow under heating extraction zero flow, the pure high back pressure heat supply state with the calculation of low pressure jar exhaust steam specific volume the high back pressure heat supply unit at the current electric load of setting for and predetermine the low pressure jar exhaust steam volume flow under the operation backpressure includes:
calculating the current set electric load of the high back pressure heat supply unit and the low pressure cylinder steam exhaust volume flow under the preset operation back pressure based on a preset volume flow calculation formula, wherein the volume flow calculation formula is as follows:
Vex0＝FLPexh×1000×vpex0
wherein Vex0 represents the low-pressure cylinder exhaust volume flow of the high-back-pressure heat supply unit under the current set electric load and the preset operation back pressure, FLPexh represents the low-pressure cylinder exhaust volume flow, and vpex0 represents the low-pressure cylinder exhaust specific volume.
7. The method for determining the operating backpressure and the minimum technical output characteristic of the high-backpressure heating unit according to any one of claims 2 to 6, wherein the updating the preset operating backpressure based on the preset rule comprises:
if the absolute value of the difference value between the low-pressure cylinder exhaust volume flow and the minimum exhaust volume flow is larger than a preset threshold value, and the low-pressure cylinder exhaust volume flow is larger than the minimum exhaust volume flow, increasing the preset operation back pressure by a preset value;
and if the absolute value of the difference value between the low-pressure cylinder steam exhaust volume flow and the minimum steam exhaust volume flow is greater than a preset threshold value, and the low-pressure cylinder steam exhaust volume flow is smaller than the minimum steam exhaust volume flow, reducing the preset operation back pressure by a preset value.
8. The method for determining the operating backpressure and minimum technical output characteristic of the high-backpressure heat supply unit according to any one of claims 1 to 6, wherein the fitting and determining the characteristic relation between the operating backpressure and the minimum technical output of the high-backpressure heat supply unit based on the highest operating backpressure of the high-backpressure heat supply unit under a plurality of electrical loads comprises:
fitting a characteristic relation between the electrical load and the highest operation backpressure based on the highest operation backpressure corresponding to each electrical load;
converting the characteristic relation between the electric load and the highest operation back pressure into the characteristic relation between the highest operation back pressure and the electric load;
and determining a characteristic relation between the operation back pressure and the minimum technical output based on the characteristic relation between the highest operation back pressure and the electrical load, wherein the operation back pressure is the highest operation back pressure value in the characteristic relation between the highest operation back pressure and the electrical load, and the minimum technical output is the electrical load value in the characteristic relation between the highest operation back pressure and the electrical load.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the method for determining operating backpressure and minimum technical output characteristics of a high back pressure heating unit according to any of claims 1 to 8.
10. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, implements the steps of the method for determining an operating back pressure and a minimum technical output characteristic of a high back pressure heating unit according to any one of claims 1 to 8.
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| CN114877308A (en) * | 2022-06-10 | 2022-08-09 | 西安交通大学 | Method for determining operation interval of coal-fired double-extraction heat supply system |
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