CN113868783B - Method for determining running back pressure and minimum technical output characteristic of high back pressure heat supply unit - Google Patents
Method for determining running back pressure and minimum technical output characteristic of high back pressure 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 back pressure and the minimum technical output characteristic of a high back pressure 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 the high back pressure heat supply unit under the set electric load in a heating steam extraction zero flow and pure high back pressure heat supply state; setting electric loads, and respectively calculating the highest running back pressure of the high back pressure heat supply unit under a plurality of electric loads; and fitting and determining the characteristic relation between the operation back pressure of the high back pressure heat supply unit and the minimum technical output force based on the highest operation back pressure of the high back pressure heat supply unit under a plurality of electric loads. The invention converts the highest operation back pressure under each electric load into the characteristic relation of the operation back pressure and the minimum technical output force, 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 force 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 back pressure and minimum technical output characteristics of a high back pressure heat supply unit.
Background
At present, after the high back pressure technology transformation is carried out on the steam turbine of the existing heat supply unit, the minimum technical output of the unit during peak shaving operation is directly related to the back pressure of the unit operation, and the higher the operating back pressure of the unit is, the higher the minimum technical output of the unit is, namely the worse the peak shaving performance of the unit is. Therefore, in order to improve the peak shaving performance of the unit, flexible adjustment of the running back pressure is an effective means.
However, the related characteristics of the operation back pressure and the minimum technical output under the low-load working condition of the high-back pressure heat supply unit are not yet determined, so that the minimum technical output of the high-back pressure heat supply unit is difficult to be effectively reduced by adjusting the operation back pressure.
Disclosure of Invention
In view of the above, the invention provides a method for determining the operating back pressure and the minimum technical output characteristics of a high back pressure heat supply unit, so as to solve the problem of effectively reducing the minimum technical output of the high back pressure heat supply unit by adjusting the operating back pressure.
A first aspect of the embodiment of the invention provides a method for determining the running back pressure and the minimum technical output characteristic of a high back pressure heat supply unit, which comprises the following steps:
obtaining design parameters of a high back pressure heat supply unit;
Acquiring operation condition parameters of the high back pressure heat supply unit under the set electric load in a heating steam extraction zero flow and pure high back pressure 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 electric loads, and respectively calculating the highest running back pressure of the high back pressure heat supply unit under a plurality of electric loads;
And fitting and determining the characteristic relation between the operation back pressure of the high back pressure heat supply unit and the minimum technical output force based on the highest operation back pressure of the high back pressure heat supply unit under a plurality of electric 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 executes the computer program to implement the steps of a method for determining 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 storing a computer program which, when executed by a processor, implements the steps of a method for determining operating backpressure and minimum technical output characteristics of any high backpressure heating unit.
Compared with the prior art, the invention has the beneficial effects that:
The method for determining the running back pressure and the minimum technical output characteristic of the high back pressure heat supply unit comprises the following steps: obtaining design parameters of a high back pressure heat supply unit; acquiring operation condition parameters of the high back pressure heat supply unit under the set electric load in a heating steam extraction zero flow and pure high back pressure 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 electric loads, and respectively calculating the highest running back pressure of the high back pressure heat supply unit under a plurality of electric loads; and fitting and determining the characteristic relation between the operation back pressure of the high back pressure heat supply unit and the minimum technical output force based on the highest operation back pressure of the high back pressure heat supply unit under a plurality of electric 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 technology output by utilizing the characteristic that the minimum technology output in the high back pressure heat supply unit is equal to the electric load and the operation back pressure cannot be larger than the highest operation back pressure, adjusts the operation back pressure of the high back pressure heat supply unit according to the characteristic relation, can realize the accurate adjustment of the minimum technology output of the high back pressure heat supply unit, and better improves the peak regulation operation capacity of the high back pressure heat supply unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an implementation of a method for determining the operating back pressure and minimum technical output characteristics of a high back pressure heating unit provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a device for determining the operating back pressure and the minimum technical output characteristics of a high back pressure heat supply unit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a terminal according to an embodiment of the present invention;
FIG. 4 is a schematic representation of the characteristic curves obtained in an 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 the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present 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.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, a flowchart of an implementation method for determining operating back pressure and minimum technical output characteristics of a high back pressure heat supply unit provided by an embodiment of the present invention is shown, where the method is applied to a terminal device, and is described in detail as follows:
And step 101, obtaining design parameters of the high back pressure heat supply unit.
In this embodiment, the power generation amount of the high back pressure heat supply unit varies with the variation of the heat load. The design parameters of the high back pressure heat supply unit comprise the inherent parameters of the high back pressure heat supply unit and the operation parameters under the design working conditions. The design parameters of the high back pressure heat supply unit can comprise low pressure cylinder efficiency under rated load working conditions and minimum exhaust volume flow for ensuring the safe operation of the final stage blade of the low pressure cylinder.
Step 102, obtaining operation condition parameters of the high back pressure heat supply unit under the set electric load when the heating steam extraction is in a zero flow and pure high back pressure heat supply state.
In this embodiment, the operation condition parameters of the high back pressure heat supply unit include low pressure cylinder steam inlet flow, low pressure cylinder steam outlet flow, turbine back pressure, low pressure cylinder steam inlet temperature, etc., where the units of the low pressure cylinder steam inlet flow and the low pressure cylinder steam outlet flow are t/h, the units of the turbine back pressure are kPa, the units of the low pressure cylinder steam inlet pressure are MPa, and the units of the low pressure cylinder steam inlet temperature are ℃. The terminal equipment can calculate the operation condition parameters corresponding to the electric load of the high back pressure heat supply unit in the heating steam extraction zero flow and pure high back pressure heat supply state based on the design parameters of the high back pressure heat supply unit so as to obtain the operation condition parameters.
Optionally, step 102 includes:
And 1021, obtaining the low-pressure cylinder steam inlet flow of the high-back pressure heat supply unit under the design rated load, the low-pressure cylinder steam inlet pressure under the design rated load, the heating steam extraction zero flow and the 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 operation of the unit.
Step 1022, calculating the low pressure cylinder steam inlet flow in the heating steam extraction zero flow and pure high back pressure heat supply 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 in the state of zero heating steam extraction and pure high back pressure heat supply, pLPin represents the low-pressure cylinder steam inlet pressure in the state of zero heating steam extraction and pure high back pressure heat supply, FLPin d represents the low-pressure cylinder steam inlet flow under the design rated load, and pLPin d represents the low-pressure cylinder steam inlet pressure under the design rated load.
In this embodiment, the low pressure cylinder steam inlet flow and the low pressure cylinder steam inlet pressure under the same working condition are in direct proportion, the terminal device can calculate the ratio of the low pressure cylinder steam inlet flow and the low pressure cylinder steam inlet pressure based on the low pressure cylinder steam inlet flow and the low pressure cylinder steam inlet pressure under the design rated load, and then calculate the low pressure cylinder steam inlet flow under the heating and steam extraction zero flow and the pure high back pressure heat supply state based on the ratio and the low pressure cylinder steam inlet pressure under the heating and steam extraction zero flow and the pure high back pressure heat supply state.
Step 1023, calculating the low-pressure cylinder exhaust flow in the heating and steam extraction zero flow and pure high back pressure heat supply 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 steam discharge flow in the heating steam extraction zero flow and pure high back pressure heating state, FLPexh d represents the low-pressure cylinder steam discharge flow under the design rated load.
In this embodiment, based on step 1022, the terminal device may calculate the low pressure cylinder exhaust flow of the high back pressure heat supply unit in the heating and steam extraction zero flow and pure high back pressure heat supply state based on the ratio of the low pressure cylinder exhaust flow and the low pressure cylinder inlet flow under the design rated load.
And step 103, 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.
In this embodiment, the higher the operation back pressure of the high back pressure heat supply unit is, the stronger the corresponding peak shaving capability is, i.e. the higher the power that can be output is. However, when the operation back pressure is too high, the parts of the steam turbine are subjected to larger stress, and the operation safety of the unit can be influenced, so that the highest operation back pressure under each electric load needs to be determined. Because the highest running back pressure cannot be directly calculated, the specific calculation method can be to set a running back pressure, calculate a certain parameter under the set running back pressure, and compare the calculated parameter with the design parameter of the high back pressure heat supply unit, thereby judging whether the set running back pressure can affect the running safety of the unit. It is also desirable in this embodiment to ensure that the calculated highest operating backpressure should not be greater than the rated highest backpressure of the high backpressure unit.
Optionally, in step 103, the design parameters include minimum exhaust volumetric flow and low pressure cylinder efficiency under rated load conditions; the operation condition parameters comprise the steam inlet pressure of the low-pressure cylinder, the steam inlet temperature of the low-pressure cylinder and the steam discharge flow of the low-pressure cylinder.
Accordingly, step 103 includes:
And step 1031, calculating the current set electric load and the low pressure cylinder steam discharge volume flow of the high back pressure heat supply unit under the preset running back pressure based on the low pressure cylinder efficiency, the heating steam extraction zero flow, the low pressure cylinder steam inlet pressure, the low pressure cylinder steam inlet temperature and the low pressure cylinder steam discharge flow in the pure high back pressure heat supply state.
In the embodiment, the safety operation of the high back pressure heat supply unit is affected by the too low exhaust volume flow of the low pressure cylinder, and the fact that the operation back pressure of the high back pressure heat supply unit is increased is indicated by the higher exhaust volume flow of the low pressure cylinder. Therefore, the terminal equipment calculates the set electric load and the low-pressure cylinder exhaust volume flow under the preset operation back pressure, compares the calculated low-pressure cylinder exhaust volume flow with the low-pressure cylinder exhaust volume flow for ensuring the safe operation of the unit, and can judge whether the preset operation back pressure is the highest operation back pressure for ensuring the safe operation of the unit.
Optionally, step 1031 includes:
And step 10311, calculating the low-pressure cylinder steam exhaust 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 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.
Optionally, step 10311 includes:
Calculating the exhaust steam 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 steam enthalpy value calculation formula, wherein the exhaust steam enthalpy value calculation formula is as follows:
wherein, hex0 represents the vapor extraction enthalpy value of the low pressure cylinder, pexO represents the preset operation back pressure, pLPin represents the vapor inlet pressure of the low pressure cylinder in the heating and vapor extraction zero flow and pure high back pressure heating state, tLPin represents the vapor inlet temperature of the low pressure cylinder in the heating and vapor extraction zero flow and pure high back pressure heating state, hpt (p, t) represents the vapor-water characteristic function for solving the medium enthalpy value according to the medium pressure and the medium temperature, spt (p, t) represents the vapor-water characteristic function for solving the medium entropy value according to the medium pressure and the medium temperature, hps (p, s) represents the vapor-water characteristic function for solving the medium enthalpy value according to the medium pressure and the medium entropy value, and eta LP represents the low pressure cylinder efficiency under the rated load working condition.
In the embodiment, the low-pressure cylinder exhaust enthalpy value is used for calculating the low-pressure cylinder exhaust specific volume of the high-back pressure heat supply unit under the current set electric load and the preset running back pressure.
And step 10312, calculating the low-pressure cylinder 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 the low-pressure cylinder exhaust enthalpy value.
Optionally, step 10312 includes:
calculating the exhaust specific volume 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 specific volume calculation formula, wherein the exhaust specific volume calculation formula is as follows:
vpex0＝vpx(pex0，xph(pex0，hex0))
wherein pex0 represents preset running back pressure, hex0 represents low-pressure cylinder exhaust enthalpy value, xph (p, h)) represents steam-water characteristic function for solving medium dryness according to medium pressure and medium enthalpy value, vpx (p, x) represents steam-water characteristic function for solving medium specific volume according to medium pressure and medium dryness.
In this embodiment, the low pressure cylinder specific exhaust volume is used to calculate the low pressure cylinder exhaust volume flow in combination with the low pressure cylinder exhaust enthalpy.
And step 10313, calculating the current set electric load and the low-pressure cylinder steam discharge volume flow under the preset operation back pressure of the high-back pressure heat supply unit based on the heating steam extraction zero flow, the low-pressure cylinder steam discharge flow and the low-pressure cylinder steam discharge specific volume in the pure high-back pressure heat supply state.
Optionally, step 10313 includes:
Calculating the exhaust volume flow 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 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 flow, and vpex0 represents the low-pressure cylinder exhaust specific volume.
Step 1032, determining whether the low pressure cylinder exhaust volume flow and the minimum exhaust volume flow meet preset safe operating conditions.
In this embodiment, the minimum exhaust volume flow may be a minimum exhaust volume flow that ensures safe operation of the last stage blade of the low pressure cylinder. And if the current operation back pressure and the low-pressure cylinder steam exhaust volume flow corresponding to the electric load meet the safe operation condition, the current operation back pressure is the highest operation back pressure meeting the safe operation of the high-back pressure heat supply unit under the current electric load.
Optionally, on the basis of any embodiment, 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 highest running back pressure. If the absolute value of the difference value between the low-pressure cylinder exhaust volume flow and the minimum exhaust volume flow is smaller than 0.001, the current operation back pressure is the highest operation back pressure which meets the safety operation of the high-back pressure heat supply unit under the current electric load; 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 not less than 0.001, the current operation back pressure is larger or smaller, and adjustment is needed.
Step 1033, if the safe operation condition is not met, updating the preset operation back pressure based on the preset rule, and jumping to the step of calculating the current set electric load and the low pressure cylinder exhaust volume flow of the high back pressure heat supply unit under the preset operation back pressure based on the low pressure cylinder efficiency, the heating and steam extraction zero flow, the low pressure cylinder steam inlet pressure, the low pressure cylinder steam inlet temperature and the low pressure cylinder exhaust flow under the pure high back pressure heat supply state.
Optionally, on the basis of any one of the embodiments, updating the preset running back pressure 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 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 running 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 larger than a 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 exhaust volume flow of the low pressure cylinder corresponding to the current operation back pressure is greater than the minimum exhaust volume flow, it is indicated that the preset operation back pressure is smaller, and the preset operation back pressure should be increased during adjustment; if the exhaust volume flow of the low-pressure cylinder corresponding to the current operation back pressure is smaller than the minimum exhaust volume flow, the preset operation back pressure is larger, and the preset operation back pressure is reduced during adjustment. The adjustment of the preset operating back pressure can also be determined according to the difference between the low pressure cylinder exhaust volume flow and the minimum exhaust volume flow.
If the safe operation condition is met, step 1034 is performed, and the highest operation back pressure corresponding to the current set electrical load is determined to be the preset operation back pressure.
In this embodiment, since the operating back pressure of the high back pressure unit cannot be greater than the rated highest back pressure, the terminal device needs to determine whether the highest operating back pressure corresponding to the currently set electrical load is greater than the rated highest back pressure of the high back pressure unit. If the electric load is not greater than the preset electric load, the highest running back pressure corresponding to the preset electric load is the preset running back pressure; if the power load is larger than the rated power load, the highest running back pressure corresponding to the currently set power load is the rated highest back pressure of the high back pressure unit.
And 104, resetting the electric load, and respectively calculating the highest running back pressure of the high back pressure heat supply unit under a plurality of electric loads.
In this embodiment, in order to determine the highest operation back pressure under each electrical load, the terminal device needs to set a plurality of electrical loads, and calculate the highest operation back pressure of the high back pressure heat supply unit under the plurality of electrical loads respectively. The number of electrical loads is set so as to achieve a characteristic relationship of determining the electrical load to the highest operating backpressure.
And 105, fitting and determining the characteristic relation between the operation back pressure of the high back pressure heat supply unit and the minimum technical output force based on the highest operation back pressure of the high back pressure heat supply unit under a plurality of electric loads.
In this embodiment, based on the characteristics of the high back pressure heating unit, the electrical load of the high back pressure heating unit is the minimum technical output. Therefore, after the characteristic relation between the electric load and the highest operation back pressure is determined, the terminal equipment converts the characteristic relation into the characteristic relation between the highest operation back pressure and the electric load, and the characteristic relation between the operation back pressure and the minimum technical output force is obtained.
Optionally, on the basis of any one of the embodiments, determining, based on the highest operating backpressure of the high-backpressure heat supply unit under the plurality of electrical loads, a characteristic relationship between the operating backpressure of the high-backpressure heat supply unit and the minimum technical output by fitting 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 electric load, wherein the operation back pressure takes the highest operation back pressure value in the characteristic relation between the highest operation back pressure and the electric load, and the minimum technical output takes the electric load value in the characteristic relation between the highest operation back pressure and the electric load.
In this embodiment, after the terminal device converts the characteristic relationship between the electrical load and the highest operation back pressure into the characteristic relationship between the highest operation back pressure and the electrical load, a characteristic relationship expression between the highest operation back pressure and the electrical load may be obtained, and a characteristic relationship curve between the highest operation back pressure and the electrical load as shown in fig. 4 may also be obtained. The characteristic curve represents the minimum technical output corresponding to each highest operating back pressure, the abscissa in fig. 4 represents the operating back pressure, the ordinate represents the minimum technical output, and the portion of the abscissa lower than the highest operating back pressure in fig. 4 is the range of the operating back pressure that can take on.
From the above, the design parameters of the high back pressure heat supply unit are firstly obtained; acquiring operation condition parameters of the high back pressure heat supply unit under the set electric load in a heating steam extraction zero flow and pure high back pressure 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 parameter and the operation condition parameter; resetting the electric loads, and respectively calculating the highest running back pressure of the high back pressure heat supply unit under a plurality of electric loads; and finally, fitting and determining the characteristic relation between the operation back pressure of the high-back pressure heat supply unit and the minimum technical output force based on the highest operation back pressure of the high-back pressure heat supply unit under a plurality of electric 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 technology output by utilizing the characteristic that the minimum technology output in the high back pressure heat supply unit is equal to the electric load and the operation back pressure cannot be larger than the highest operation back pressure, adjusts the operation back pressure of the high back pressure heat supply unit according to the characteristic relation, can realize the accurate adjustment of the minimum technology output of the high back pressure heat supply unit, and better improves the peak regulation operation capacity of the high back pressure heat supply unit.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The following are device embodiments of the invention, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 2 is a schematic structural diagram of a device for determining operating back pressure and minimum technical output characteristics of a high back pressure heat supply unit according to an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, and details are as follows:
As shown in fig. 2, the determining device 2 for determining the operating back pressure and the minimum technical output characteristic of the high back pressure heat supply unit includes:
the first obtaining module 21 is configured to obtain design parameters of the high back pressure heat supply unit.
The second obtaining module 22 is configured to obtain an operation condition parameter of the high back pressure heat supply unit under the electrical load when the heating steam extraction is in a zero flow and pure high back pressure heat supply state.
The back pressure calculation module 23 is used for calculating the highest operation back pressure of the high back pressure heat supply unit under the current set electric load based on the design parameter and the operation condition parameter.
The load adjustment module 24 is used for resetting the electric loads and calculating the highest operation back pressures of the high back pressure heat supply units under a plurality of electric loads respectively.
And the characteristic fitting module 25 is used for fitting and determining the characteristic relation between the operation back pressure of the high back pressure heat supply unit and the minimum technical output force based on the highest operation back pressure of the high back pressure heat supply unit under a plurality of electric loads.
Optionally, the second obtaining module 22 includes:
The first acquisition unit is used for acquiring the low-pressure cylinder steam inlet flow of the high-back pressure heat supply unit under the design rated load, the low-pressure cylinder steam inlet pressure and heating steam extraction zero flow under the design rated load and the low-pressure cylinder steam inlet pressure under the pure high-back pressure heat supply state;
the first calculation unit is used for calculating the steam inlet flow of the low-pressure cylinder under the heating steam extraction zero flow and pure high back pressure heat supply state based on a preset steam inlet flow calculation formula, and the steam inlet flow calculation formula is as follows:
Wherein FLPin represents the low-pressure cylinder steam inlet flow in the state of zero heating steam extraction and pure high back pressure heat supply, pLPin represents the low-pressure cylinder steam inlet pressure in the state of zero heating steam extraction and pure high back pressure heat supply, FLPin d represents the low-pressure cylinder steam inlet flow under the design rated load, pLPin d represents the low-pressure cylinder steam inlet pressure under the design rated load;
the second calculating unit is used for calculating the steam exhaust flow of the low-pressure cylinder under the heating steam extraction zero flow and pure high back pressure heat supply state based on a preset steam exhaust flow calculating formula, and the steam exhaust flow calculating formula is as follows:
Wherein FLPexh represents the low-pressure cylinder steam discharge flow in the heating steam extraction zero flow and pure high back pressure heating state, FLPexh d represents the low-pressure cylinder steam discharge flow under the design rated load.
Optionally, the design parameters include minimum exhaust volumetric flow and low pressure cylinder efficiency under rated load conditions; the operation condition parameters comprise low pressure cylinder steam inlet pressure, low pressure cylinder steam inlet temperature and low pressure cylinder steam discharge flow;
Accordingly, the backpressure calculation module 23 includes:
The low-pressure cylinder steam exhaust volume flow calculation unit is used for calculating the low-pressure cylinder steam exhaust volume flow 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 steam extraction zero flow, the low-pressure cylinder steam inlet pressure, the low-pressure cylinder steam inlet temperature and the low-pressure cylinder steam exhaust flow in the pure high-back pressure heat supply state;
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 accord with preset safe operation conditions or not;
The jump unit is used for updating the preset operation back pressure based on a preset rule when the safety operation condition is not met, and jumping to a step of calculating the current set electric load and the low pressure cylinder steam discharge volume flow of the high back pressure heat supply unit 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, the low pressure cylinder steam inlet temperature and the low pressure cylinder steam discharge flow under the pure high back pressure heat supply state;
And the determining unit is used for determining that the highest running back pressure corresponding to the current set electric load is the preset running back pressure when the safety running condition is met.
Optionally, the low pressure cylinder exhaust volume flow calculation unit:
The low-pressure cylinder steam exhaust enthalpy value calculating subunit is used for calculating the low-pressure cylinder steam exhaust enthalpy value of the high-back pressure heat supply unit under the current set electric load and the preset running 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;
The low-pressure cylinder exhaust specific volume calculating subunit is used for calculating the low-pressure cylinder exhaust specific volume of the high-back pressure heat supply unit under the current set electric load and the preset running back pressure based on the low-pressure cylinder exhaust enthalpy value;
And the low-pressure cylinder steam exhaust volumetric flow meter operator unit is used for calculating the current set electric load and the low-pressure cylinder steam exhaust volumetric flow under the preset running back pressure of the high-back pressure heat supply unit based on the low-pressure cylinder steam exhaust flow and the low-pressure cylinder steam exhaust specific volume under the heating steam extraction zero flow and the pure high-back pressure heat supply state.
Optionally, the low-pressure cylinder exhaust steam enthalpy value calculating subunit is specifically configured to:
Calculating the exhaust steam 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 steam enthalpy value calculation formula, wherein the exhaust steam enthalpy value calculation formula is as follows:
Wherein hex0 represents the vapor extraction enthalpy value of the low pressure cylinder, pex0 represents the preset operation back pressure, pLPin represents the vapor inlet pressure of the low pressure cylinder in the heating and vapor extraction zero flow and pure high back pressure heat supply state, tLPin represents the vapor inlet temperature of the low pressure cylinder in the heating and vapor extraction zero flow and pure high back pressure heat supply state, hpt (p, t) represents the vapor-water characteristic function for solving the medium enthalpy value according to the medium pressure and the medium temperature, spt (p, t) represents the vapor-water characteristic function for solving the medium entropy value according to the medium pressure and the medium temperature, hps (p, s) represents the vapor-water characteristic function for solving the medium enthalpy value according to the medium pressure and the medium entropy value, and eta LP represents the low pressure cylinder efficiency under the rated load working condition.
Optionally, the low pressure cylinder specific exhaust volume calculating subunit is specifically configured to:
calculating the exhaust specific volume 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 specific volume calculation formula, wherein the exhaust specific volume calculation formula is as follows:
vpex0＝vpx(pex0，xph(pex0，hex0))
Wherein pex0 represents preset running back pressure, hex0 represents low-pressure cylinder exhaust enthalpy value, xph (p, h)) represents steam-water characteristic function for solving medium dryness according to medium pressure and medium enthalpy value, vpx (p, x) represents steam-water characteristic function for solving medium specific volume according to medium pressure and medium dryness;
optionally, the low pressure cylinder exhaust gas volumetric flowmeter operator unit is specifically configured to:
Calculating the exhaust volume flow 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 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 flow, and vpex0 represents the low-pressure cylinder exhaust specific volume.
Optionally, on the basis of any embodiment, 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;
Optionally, on the basis of any one of the foregoing 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 running 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 larger than a 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.
Optionally, on the basis of any one of the foregoing embodiments, the characteristic fitting module 25 is specifically configured to:
fitting a characteristic relation between the electric load and the highest operation back pressure based on the highest operation back pressure corresponding to each electric 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 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 electric load, wherein the operation back pressure takes the highest operation back pressure value in the characteristic relation between the highest operation back pressure and the electric load, and the minimum technical output takes the electric load value in the characteristic relation between the highest operation back pressure and the electric load.
From the above, the design parameters of the high back pressure heat supply unit are firstly obtained; acquiring operation condition parameters of the high back pressure heat supply unit under the set electric load in a heating steam extraction zero flow and pure high back pressure 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 parameter and the operation condition parameter; resetting the electric loads, and respectively calculating the highest running back pressure of the high back pressure heat supply unit under a plurality of electric loads; and finally, fitting and determining the characteristic relation between the operation back pressure of the high-back pressure heat supply unit and the minimum technical output force based on the highest operation back pressure of the high-back pressure heat supply unit under a plurality of electric 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 technology output by utilizing the characteristic that the minimum technology output in the high back pressure heat supply unit is equal to the electric load and the operation back pressure cannot be larger than the highest operation back pressure, adjusts the operation back pressure of the high back pressure heat supply unit according to the characteristic relation, can realize the accurate adjustment of the minimum technology output of the high back pressure heat supply unit, and better improves the peak regulation operation capacity of the high back pressure 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 executes the computer program 32 to implement the steps in the above embodiments of the method for determining the back pressure and the minimum technical output characteristics of each high back pressure heating unit, for example, steps 101 to 103 shown in fig. 1. Or the processor 30, when executing the computer program 32, performs the functions of the modules/units of the device embodiments described above, 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 complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program 32 in the terminal 3.
The terminal 3 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. 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 merely an example of the terminal 3 and does not constitute a limitation of the terminal 3, and may include more or less components than illustrated, or may combine certain components, or different components, e.g., the terminal may further include an input-output device, a network access device, a bus, etc.
The Processor 30 may be a central processing unit (Central Processing Unit, CPU), other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, 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 memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD) or the like, which are 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 as well as other programs and data required by the terminal. The memory 31 may also be used for temporarily storing 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-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
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 solution. 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 manners. For example, the apparatus/terminal embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium may include content that is subject to appropriate increases and decreases as required by jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is not included as electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (8)
1. A method for determining the running back pressure and the minimum technical output characteristic of a high back pressure heat supply unit is characterized by comprising the following steps:
obtaining design parameters of a high back pressure heat supply unit;
Acquiring operation condition parameters of the high back pressure heat supply unit under the set electric load in a heating steam extraction zero flow and pure high back pressure 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 electric loads, and respectively calculating the highest running back pressure of the high back pressure heat supply unit under a plurality of electric loads;
based on the highest operation back pressure of the high back pressure heat supply unit under a plurality of electric loads, fitting and determining the characteristic relation between the operation back pressure of the high back pressure heat supply unit and the minimum technical output force;
the design parameters comprise minimum exhaust volume flow and low pressure cylinder efficiency under rated load working conditions; the operation condition parameters comprise low-pressure cylinder steam inlet pressure, low-pressure cylinder steam inlet temperature and low-pressure cylinder steam discharge flow;
correspondingly, the calculating the highest operation back pressure of the high back pressure heat supply unit under the current set electric load based on the design parameter and the operation condition parameter comprises:
calculating the current set electric load and the low pressure cylinder steam discharge volume flow of the high back pressure heat supply unit under the preset running back pressure based on the low pressure cylinder efficiency, the heating steam extraction zero flow, the low pressure cylinder steam inlet pressure, the low pressure cylinder steam inlet temperature and the low pressure cylinder steam discharge flow in the pure high back pressure heat supply state;
judging whether the exhaust steam volume flow of the low-pressure cylinder and the minimum exhaust steam volume flow accord with preset safe operation conditions or not;
If the safe operation condition is not met, updating a preset operation back pressure based on a preset rule, and jumping to a step of calculating the low-pressure cylinder steam discharge volume flow 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 steam extraction zero flow, the low-pressure cylinder steam inlet pressure, the low-pressure cylinder steam inlet temperature and the low-pressure cylinder steam discharge flow in a pure high-back pressure heat supply state;
If the safe operation condition is met, determining that the highest operation back pressure corresponding to the current set electric load is the preset operation back pressure;
the characteristic relation of the operation back pressure of the high back pressure heat supply unit and the minimum technical output is determined by fitting based on the highest operation back pressure of the high back pressure heat supply unit under a plurality of electric loads, and the characteristic relation comprises the following steps:
fitting a characteristic relation between the electric load and the highest operation back pressure based on the highest operation back pressure corresponding to each electric 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 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 electric load, wherein the operation back pressure takes the highest operation back pressure value in the characteristic relation between the highest operation back pressure and the electric load, and the minimum technical output takes the electric load value in the characteristic relation between the highest operation back pressure and the electric load.
2. The method for determining the operating back pressure and the minimum technical output characteristic of the high back pressure heat supply unit according to claim 1, wherein the obtaining the operating condition parameters of the high back pressure heat supply unit under the electric load when the heating and steam extraction is in the zero flow and pure high back pressure heat supply state comprises the following steps:
Obtaining the low-pressure cylinder steam inlet flow of the high back pressure heat supply unit under the design rated load, the low-pressure cylinder steam inlet pressure under the design rated load, the heating steam extraction zero flow and the low-pressure cylinder steam inlet pressure under the pure high back pressure heat supply state;
calculating the steam inlet flow of the low-pressure cylinder under the heating and steam extraction zero flow and pure high back pressure heat supply 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 in the state of zero heating steam extraction and pure high back pressure heat supply, pLPin represents the low-pressure cylinder steam inlet pressure in the state of zero heating steam extraction and pure high back pressure heat supply, FLPin d represents the low-pressure cylinder steam inlet flow under the design rated load, pLPin d represents the low-pressure cylinder steam inlet pressure under the design rated load;
Calculating the low-pressure cylinder exhaust steam flow under the heating steam extraction zero flow and pure high back pressure heat supply 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 steam discharge flow in the heating steam extraction zero flow and pure high back pressure heating state, FLPexh d represents the low-pressure cylinder steam discharge flow under the design rated load.
3. The method for determining the operating backpressure and the minimum technical output characteristics of the high backpressure heat supply unit according to claim 1, wherein calculating the low pressure cylinder exhaust volume flow of the high backpressure heat supply unit under the current set electrical load and the preset operating backpressure based on the low pressure cylinder efficiency, the heating extraction zero flow, the low pressure cylinder inlet pressure, the low pressure cylinder inlet temperature and the low pressure cylinder exhaust flow in the pure high backpressure heat supply state comprises:
Calculating the current set electric load and the low pressure cylinder steam exhaust enthalpy value under the preset running back pressure of the high back pressure heat supply unit based on the low pressure cylinder efficiency, the heating steam extraction zero flow, the low pressure cylinder steam inlet pressure and the low pressure cylinder steam inlet temperature in the pure high back pressure heat supply state;
calculating the low-pressure cylinder 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 the low-pressure cylinder exhaust enthalpy value;
And calculating the current set electric load of the high-back pressure heat supply unit and the low-pressure cylinder steam discharge volume flow under the preset operation back pressure based on the low-pressure cylinder steam discharge flow and the low-pressure cylinder steam discharge specific volume in the heating steam extraction zero flow and the pure high-back pressure heat supply state.
4. The method for determining the operating back pressure and the minimum technical output characteristic of the high back pressure heat supply unit according to claim 3, wherein calculating the low pressure cylinder exhaust enthalpy value 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 heating steam extraction zero flow, the low pressure cylinder intake pressure and the low pressure cylinder intake temperature in the pure high back pressure heat supply state comprises:
Calculating the exhaust steam 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 steam enthalpy value calculation formula, wherein the exhaust steam enthalpy value calculation formula is as follows:
Wherein hex0 represents the vapor extraction enthalpy value of the low pressure cylinder, pex0 represents the preset operation back pressure, pLPin represents the vapor inlet pressure of the low pressure cylinder in the heating and vapor extraction zero flow and pure high back pressure heating state, tLPin represents the vapor inlet temperature of the low pressure cylinder in the heating and vapor extraction zero flow and pure high back pressure heating state, hpt (p, t) represents the vapor-water characteristic function for solving the medium enthalpy value according to the medium pressure and the medium temperature, spt (p, t) represents the vapor-water characteristic function for solving the medium entropy value according to the medium pressure and the medium temperature, hps (p, s) represents the vapor-water characteristic function for solving the medium enthalpy value according to the medium pressure and the medium entropy value, and ηLP represents the low pressure cylinder efficiency under the rated load working condition.
5. The method for determining an operating backpressure and minimum technical output characteristic of a high backpressure heat supply unit according to claim 3, wherein calculating a low pressure cylinder exhaust specific volume of the high backpressure heat supply unit under a currently set electrical load and the preset operating backpressure based on the low pressure cylinder exhaust enthalpy value comprises:
Calculating the exhaust specific volume 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 specific volume calculation formula, wherein the exhaust specific volume calculation formula is as follows:
vpex0＝vpx(pex0,xph(pex0,hex0))
wherein pex0 represents the preset running 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, 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;
The calculation of the electric load of the high back pressure heat supply unit under the current setting and the low pressure cylinder steam discharge volume flow under the preset operation back pressure based on the low pressure cylinder steam discharge flow and the low pressure cylinder steam discharge specific volume under the heating steam extraction zero flow and the pure high back pressure heat supply state comprises the following steps:
Calculating the exhaust volume flow 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 volume flow calculation formula, wherein the volume flow calculation formula is as follows:
Vex0＝FLPexh×1000×vpex0
The Vex0 represents 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, FLPexh represents the low pressure cylinder exhaust flow, and vpex0 represents the low pressure cylinder exhaust specific volume.
6. The method of 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 5, wherein updating the preset operating back pressure based on a 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 running 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 larger than a 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.
7. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, carries out the steps of the method for determining the operating backpressure and minimum technical output characteristics of a high backpressure heating unit according to any of the preceding claims 1 to 6.
8. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of determining the operating backpressure and minimum technical output characteristics of a high backpressure heating unit according to any of the preceding claims 1 to 6.
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