Method and system for calculating minimum coal consumption amount of high backpressure heating unit

Abstract

The present invention provides a method and system for calculating the minimum coal consumption amount of a high-backpressure heating unit. The method comprises: selecting unit backpressure; on the basis of the unit backpressure and an actual working condition and a theoretical working condition of a heating unit, respectively calculating a corresponding unit-side steam exhaust heating amount and a corresponding heating-network-side steam exhaust heat load, and on the basis of a first preset rule, the unit-side steam exhaust heating amount, and the heating-network-side steam exhaust heat load, calculating a corresponding steam exhaust heating parameter so as to calculate the optimal steam exhaust amount by means of the steam exhaust heating parameter; on the basis of a second preset rule, calculating steam extraction amounts required by different steam extraction ports corresponding to the heating unit, and comparing unit coal consumption rates of different steam extraction ports under different steam extraction heating parameters to determine the corresponding optimal steam extraction amount; on the basis of the optimal steam exhaust amount and the optimal steam extraction amount, generating a corresponding boundary condition, and on the basis of the boundary condition and an actual electrical load demand, calculating the corresponding minimum coal consumption amount. The present application can accurately calculate the minimum coal consumption amount, thereby improving the use experience of users.

Description

A method and system for calculating the minimum coal consumption of a high back pressure heating unit Technical Field

[0001] The present invention relates to the technical field of energy conservation and consumption reduction in cogeneration of heat and power, and in particular to a method and system for calculating the minimum coal consumption of a high back-pressure heating unit. Background Art

[0002] Cogeneration, the primary method for heating retrofits for coal-fired power plants, offers a variety of methods, including high back-pressure heating, low-pressure cylinder removal, and bare-axis rotors in the low-pressure cylinder. High back-pressure heating, however, has become a key approach for unit heating retrofits due to its advantages in expanding the unit's heating capacity and improving energy efficiency. During variable operating conditions, the back-pressure and coal consumption of high-back-pressure units determine the degree of exhaust steam heat load utilization. Furthermore, the amount of steam extracted from the intermediate-pressure cylinders determines the exhaust volume of the low-pressure cylinders and the unit's power generation. To minimize the loss of waste heat from the low-pressure cylinder exhaust and improve operational efficiency, optimal heating parameters and boiler coal consumption must be determined.

[0003] Existing high-back-pressure heating units generally operate in a "heat-to-power" mode. Their heating load is composed of the exhaust steam heat load and the extraction steam heat load on the unit side, while the heating demand is determined by the supply and return water temperature and circulating water flow rate on the heating network side. As the unit's back pressure increases, the temperature difference between the low-pressure cylinder exhaust steam and the return water increases, and the exhaust steam heat load also increases. However, when the high-back-pressure condenser supply water temperature exceeds the pinch point, it exacerbates the waste of exhaust steam heat and increases the power consumption of the air-cooling fan.

[0004] However, the size of the existing extraction steam heat load is determined by the extraction steam temperature and extraction steam volume. The increase in the extraction steam volume will lead to a decrease in the steam intake of the low-pressure cylinder, which will directly affect the power generation capacity of the low-pressure cylinder. When the steam intake of the low-pressure cylinder is lower than the minimum condensation steam volume, the low-pressure cylinder will operate dangerously, and the exhaust steam temperature will exceed the limit.

[0005] Therefore, in view of the shortcomings of the existing technology, it is necessary to provide a method that can effectively determine the optimal heating parameters and coal consumption of a high back pressure heating unit. Summary of the Invention

[0006] Based on this, the purpose of the present invention is to provide a method and system for calculating the minimum coal consumption of a high back pressure heating unit, so as to solve the problem that the existing technology cannot accurately determine the optimal heating parameters and coal consumption of the high back pressure heating unit.

[0007] A first aspect of an embodiment of the present invention provides a method for calculating the minimum coal consumption of a high back pressure heating unit, wherein the method includes:

[0008] Step S10, determining the corresponding total heating demand based on the heating network side parameters of the heating unit, and selecting a unit back pressure within a preset adjustment range;

[0009] Step S20, based on the unit back pressure and the actual operating conditions and theoretical operating conditions of the heating unit, respectively calculating the corresponding unit-side exhaust steam heating capacity and the heating network-side exhaust steam heat load, and calculating the corresponding exhaust steam heating parameters based on the unit-side exhaust steam heating capacity and the heating network-side exhaust steam heat load based on a first preset rule, so as to calculate the optimal exhaust steam amount based on the exhaust steam heating parameters;

[0010] Step S30, calculating the steam extraction amount required for different steam extraction ports corresponding to the heating unit according to a second preset rule, and determining the corresponding optimal steam extraction amount by comparing the unit coal consumption rates of the different steam extraction ports under different steam extraction heating parameters;

[0011] Step S40: generating corresponding boundary conditions according to the optimal exhaust steam amount and the optimal extraction steam amount, and calculating the corresponding minimum coal burning amount according to the actual electric load demand based on the boundary conditions.

[0012] The beneficial effects of the present invention are: the corresponding unit-side exhaust steam heating amount and the exhaust steam heat load on the heating network side are calculated in real time by obtaining the unit back pressure, so as to calculate the corresponding exhaust steam heating parameters, and based on this, the required optimal exhaust steam amount is calculated. Furthermore, by comparing the unit coal consumption rates of different extraction ports under different extraction heating parameters, the corresponding optimal extraction amount can be determined, so that the optimal heating parameters of the high back pressure heating unit can be accurately determined. On this basis, the minimum coal consumption corresponding to the user's actual electricity load demand can be calculated according to the optimal heating parameters, thereby greatly improving the user experience.

[0013] Preferably, the step of calculating the corresponding exhaust steam heating parameters according to the exhaust steam heating amount on the unit side and the exhaust steam heat load on the heating network side based on the first preset rule includes:

[0014] extracting in real time a first value corresponding to the exhaust steam heat supply amount on the unit side and a second value corresponding to the exhaust steam heat load on the heating network side, and determining in real time whether the first value is greater than the second value;

[0015] If it is determined that the first value is greater than the second value, reducing the set value of the unit back pressure and continuing the iterative calculation;

[0016] If it is determined that the first value is less than the second value, increasing the set value of the unit back pressure and continuing the iterative calculation;

[0017] If it is determined that the first value is equal to the second value, the calculation is stopped, and the exhaust steam heating parameter is calculated based on the first value and the second value.

[0018] Preferably, the step of calculating the steam extraction amount required for different steam extraction ports corresponding to the heating unit according to the second preset rule includes:

[0019] Calculate the heat load of the heat network side steam extraction corresponding to the heating unit according to the inlet and outlet temperature difference of the preset heat network heater, and determine in real time whether the heat load of the heat network side steam extraction is equal to the heat absorption of the unit side steam extraction;

[0020] If it is determined in real time that the extraction steam heat load on the heating network side is equal to the extraction steam heat absorption on the unit side, the extraction steam amount required for different extraction steam ports corresponding to the heating unit is calculated.

[0021] Preferably, the step of calculating the steam extraction amount required by different steam extraction ports corresponding to the heating unit includes:

[0022] When the steam extraction amounts corresponding to different steam extraction ports are obtained, the steam extraction heating parameters corresponding to each of the steam extraction ports are obtained, and the coal consumption rate of the unit corresponding to each of the steam extraction ports is calculated based on the steam extraction amounts and the steam extraction heating parameters;

[0023] The coal consumption rates of the units corresponding to each of the steam extraction ports are compared to determine the corresponding optimal steam extraction port, which corresponds to the optimal steam extraction amount.

[0024] Preferably, the step of generating corresponding boundary conditions according to the optimal exhaust steam amount and the optimal extraction steam amount includes:

[0025] When the optimal exhaust steam amount and the optimal extraction steam amount are obtained, a minimum cooling flow rate corresponding to the optimal exhaust steam amount and the optimal extraction steam amount is determined, and a mapping relationship between the optimal exhaust steam amount, the optimal extraction steam amount, and the minimum cooling flow rate is established;

[0026] A change rule among the optimal exhaust steam amount, the optimal extraction steam amount and the minimum cooling flow rate is constructed based on the mapping relationship, and the boundary condition is generated according to the change rule.

[0027] Preferably, the step of calculating the unit coal consumption rate corresponding to each steam extraction port according to the steam extraction amount and the steam extraction heating parameter includes:

[0028] Calculating the corresponding unit coal consumption according to the extraction steam volume and the extraction steam heating parameter, and calculating the unit coal consumption rate corresponding to the extraction steam port according to the unit coal consumption based on a first preset algorithm;

[0029] The expression of the first preset algorithm is:

[0030]

[0031] Among them, b tp，e Indicates the coal consumption rate of the unit, B tp，e represents the coal consumption of the unit, and P represents the power generation of the unit.

[0032] Preferably, the expression for determining the corresponding total heating demand based on the heating network side parameters of the heating unit is:

[0033]

[0034] Among them, Q tp Indicates the total heat consumption of the unit, B tp represents the total fuel consumption, q net represents the low calorific value of fuel, Q0 represents the total heat consumption of the steam turbine, η b represents boiler efficiency, η p Indicates pipeline efficiency.

[0035] A second aspect of an embodiment of the present invention provides a system for calculating the minimum coal consumption of a high back pressure heating unit, wherein the system includes:

[0036] A selection module is used to determine the corresponding total heating demand based on the heating network side parameters of the heating unit and select a unit back pressure within a preset adjustment range;

[0037] a calculation module, configured to calculate the corresponding exhaust steam heating capacity of the unit side and the exhaust steam heat load of the heating network side based on the unit back pressure and the actual operating conditions and theoretical operating conditions of the heating unit, and calculate the corresponding exhaust steam heating parameters based on the exhaust steam heating capacity of the unit side and the exhaust steam heat load of the heating network side based on a first preset rule, so as to calculate the optimal exhaust steam amount based on the exhaust steam heating parameters;

[0038] a comparison module, configured to calculate the steam extraction amounts required for different steam extraction ports corresponding to the heating unit according to a second preset rule, and determine the corresponding optimal steam extraction amount by comparing the unit coal consumption rates of the different steam extraction ports under different steam extraction heating parameters;

[0039] The execution module is used to generate corresponding boundary conditions according to the optimal exhaust steam amount and the optimal extraction steam amount, and calculate the corresponding minimum coal burning amount according to the actual power load demand based on the boundary conditions.

[0040] Among them, in the above-mentioned method for calculating the minimum coal consumption of a high back pressure heating unit, the calculation module is specifically used to:

[0041] extracting in real time a first value corresponding to the exhaust steam heat supply amount on the unit side and a second value corresponding to the exhaust steam heat load on the heating network side, and determining in real time whether the first value is greater than the second value;

[0042] If it is determined that the first value is greater than the second value, reducing the set value of the unit back pressure and continuing the iterative calculation;

[0043] If it is determined that the first value is less than the second value, increasing the set value of the unit back pressure and continuing the iterative calculation;

[0044] If it is determined that the first value is equal to the second value, the calculation is stopped, and the exhaust steam heating parameter is calculated based on the first value and the second value.

[0045] Among them, in the above-mentioned method for calculating the minimum coal consumption of the high back pressure heating unit, the comparison module is specifically used to:

[0046] Calculate the heat load of the heat network side steam extraction corresponding to the heating unit according to the inlet and outlet temperature difference of the preset heat network heater, and determine in real time whether the heat load of the heat network side steam extraction is equal to the heat absorption of the unit side steam extraction;

[0047] If it is determined in real time that the extraction steam heat load on the heating network side is equal to the extraction steam heat absorption on the unit side, the extraction steam amount required for different extraction steam ports corresponding to the heating unit is calculated.

[0048] Among them, in the above-mentioned method for calculating the minimum coal consumption of the high back pressure heating unit, the comparison module is further specifically used to:

[0049] When the steam extraction amounts corresponding to different steam extraction ports are obtained, the steam extraction heating parameters corresponding to each of the steam extraction ports are obtained, and the coal consumption rate of the unit corresponding to each of the steam extraction ports is calculated based on the steam extraction amounts and the steam extraction heating parameters;

[0050] The coal consumption rates of the units corresponding to each of the steam extraction ports are compared to determine the corresponding optimal steam extraction port, which corresponds to the optimal steam extraction amount.

[0051] Among them, in the above-mentioned method for calculating the minimum coal consumption of a high back pressure heating unit, the execution module is specifically used to:

[0052] When the optimal exhaust steam amount and the optimal extraction steam amount are obtained, a minimum cooling flow rate corresponding to the optimal exhaust steam amount and the optimal extraction steam amount is determined, and a mapping relationship between the optimal exhaust steam amount, the optimal extraction steam amount, and the minimum cooling flow rate is established;

[0053] A change rule among the optimal exhaust steam amount, the optimal extraction steam amount and the minimum cooling flow rate is constructed based on the mapping relationship, and the boundary condition is generated according to the change rule.

[0054] Among them, in the above-mentioned method for calculating the minimum coal consumption of the high back pressure heating unit, the comparison module is further specifically used to:

[0055] Calculating the corresponding unit coal consumption according to the extraction steam volume and the extraction steam heating parameter, and calculating the unit coal consumption rate corresponding to the extraction steam port according to the unit coal consumption based on a first preset algorithm;

[0056] The expression of the first preset algorithm is:

[0057]

[0058] Among them, b tp，e Indicates the coal consumption rate of the unit, B tp，e represents the coal consumption of the unit, and P represents the power generation of the unit.

[0059] Among them, in the above-mentioned method for calculating the minimum coal consumption of the high back pressure heating unit, the expression for determining the corresponding total heating demand based on the heating network side parameters of the heating unit is:

[0060]

[0061] Among them, Q tp Indicates the total heat consumption of the unit, B tp represents the total fuel consumption, q net represents the low calorific value of fuel, Q0 represents the total heat consumption of the steam turbine, η b represents boiler efficiency, η p Indicates pipeline efficiency.

[0062] A third aspect of an embodiment of the present invention proposes a computer, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for calculating the minimum coal consumption of a high back pressure heating unit as described above is implemented.

[0063] A fourth aspect of an embodiment of the present invention provides a readable storage medium having a computer program stored thereon, wherein when the program is executed by a processor, the method for calculating the minimum coal consumption of a high back pressure heating unit as described above is implemented.

[0064] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] FIG1 is a flow chart of a method for calculating the minimum coal consumption of a high back pressure heating unit provided by a first embodiment of the present invention;

[0066] FIG2 is a schematic diagram of a heating unit according to a method for calculating the minimum coal consumption of a high back pressure heating unit provided by a second embodiment of the present invention;

[0067] FIG3 is a water vapor enthalpy-entropy diagram of a method for calculating the minimum coal consumption of a high back pressure heating unit provided by a second embodiment of the present invention;

[0068] FIG4 is a structural block diagram of a system for calculating the minimum coal consumption of a high back pressure heating unit provided by a third embodiment of the present invention.

[0069] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Implementation Method

[0070] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0071] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0073] Please refer to Figure 1, which shows the method for calculating the minimum coal consumption of a high back-pressure heating unit provided by the first embodiment of the present invention. The method for calculating the minimum coal consumption of a high back-pressure heating unit provided by this embodiment can accurately calculate the minimum coal consumption corresponding to the user's actual electricity load demand, thereby greatly improving the user's usage experience.

[0074] Specifically, the method for calculating the minimum coal consumption of a high back pressure heating unit provided in this embodiment includes the following steps:

[0075] Step S10, determining the corresponding total heating demand based on the heating network side parameters of the heating unit, and selecting a unit back pressure within a preset adjustment range;

[0076] Specifically, in this embodiment, it should be noted that the method for calculating the minimum coal consumption of a high back pressure heating unit provided in this embodiment is specifically applied to various types of heating units, and is used to calculate the minimum coal consumption required by the heating unit during actual operation, so as to reduce the coal consumption and the cost of heating.

[0077] In addition, it should be pointed out that this embodiment calculates the optimal heating parameters of the above-mentioned heating unit in real time. On this basis, the required minimum coal consumption can be calculated according to the optimal heating parameters obtained in real time.

[0078] Based on this, in this step, it should be noted that, as shown in Figure 2, the heating unit provided by this embodiment involves multiple parameters during actual operation. Specifically, this step needs to first obtain the heat network side parameters of the current heating unit, and further determine the total heating demand of the current heating unit based on the heat network side parameters. Under this premise, the unit back pressure that is adapted to the current total heating demand can be determined to facilitate subsequent calculations.

[0079] Step S20, based on the unit back pressure and the actual operating conditions and theoretical operating conditions of the heating unit, respectively calculating the corresponding unit-side exhaust steam heating capacity and the heating network-side exhaust steam heat load, and calculating the corresponding exhaust steam heating parameters based on the unit-side exhaust steam heating capacity and the heating network-side exhaust steam heat load based on a first preset rule, so as to calculate the optimal exhaust steam amount based on the exhaust steam heating parameters;

[0080] Furthermore, in this step, it should be noted that, under the above-mentioned unit back pressure environment, this step will further calculate the unit side exhaust steam heating amount and the heat network side exhaust steam heat load corresponding to the current heating unit according to the actual operating conditions and theoretical operating conditions of the current unit back pressure, and both parameters are dynamically changing.

[0081] Based on this, the exhaust steam heating parameters corresponding to the current heating unit are calculated according to the exhaust steam heating amount on the current unit side and the exhaust steam heat load on the heating network side through the pre-set first preset rule, so that the required optimal exhaust steam amount can be further calculated through the exhaust steam heating parameters to facilitate subsequent calculations.

[0082] Step S30, calculating the steam extraction amount required for different steam extraction ports corresponding to the heating unit according to a second preset rule, and determining the corresponding optimal steam extraction amount by comparing the unit coal consumption rates of the different steam extraction ports under different steam extraction heating parameters;

[0083] Furthermore, in this step, it should be noted that this step will further calculate the steam extraction volume required for different steam extraction ports corresponding to the above-mentioned heating unit through a pre-set second preset rule. Based on this, the unit coal consumption rate of different steam extraction ports under different sobbing heating parameters is further compared, so that the required optimal steam extraction volume can be obtained accordingly.

[0084] It should be pointed out that the above-mentioned optimal exhaust steam volume and the current optimal extraction steam volume are generated under the above-mentioned unit back pressure environment. Therefore, when the value of the above-mentioned unit back pressure changes, the values ​​of the current optimal exhaust steam volume and the optimal extraction steam volume will also change accordingly.

[0085] Step S40: generating corresponding boundary conditions according to the optimal exhaust steam amount and the optimal extraction steam amount, and calculating the corresponding minimum coal burning amount according to the actual electric load demand based on the boundary conditions.

[0086] Finally, in this step, it should be noted that after obtaining the required optimal exhaust steam volume and optimal extraction steam volume respectively through the above steps, this step will further combine the above optimal exhaust steam volume, optimal extraction steam volume and existing cooling flow parameters to generate corresponding boundary conditions.

[0087] Similarly, this boundary condition corresponds to the aforementioned unit backpressure and will change accordingly with changes in the unit backpressure. Based on this, this step further calculates the corresponding minimum coal consumption based on the real-time boundary conditions and the user's actual electrical load demand. It should be noted that the actual electrical load demand is determined by the user's actual needs and will change in real time based on the user's needs. However, regardless of how the user's actual electrical load demand changes, the corresponding required coal consumption will be minimized, provided that the heating unit's operating parameters are optimal.

[0088] During use, the corresponding exhaust steam heating amount on the unit side and the exhaust steam heat load on the heating network side are calculated in real time through the acquired unit back pressure to calculate the corresponding exhaust steam heating parameters. Based on this, the required optimal exhaust steam volume is calculated. Furthermore, by comparing the unit coal consumption rates of different extraction ports under different extraction heating parameters, the corresponding optimal extraction volume can be determined, so that the optimal heating parameters of the high back pressure heating unit can be accurately determined. On this basis, the minimum coal consumption corresponding to the user's actual electricity load demand can be calculated according to the optimal heating parameters, thereby greatly improving the user experience.

[0089] It should be noted that the above implementation process is only to illustrate the feasibility of this application, but this does not mean that the method for calculating the minimum coal consumption of the high back-pressure heating unit of this application has only the above-mentioned implementation process. On the contrary, as long as the method for calculating the minimum coal consumption of the high back-pressure heating unit of this application can be implemented, it can be included in the feasible implementation plan of this application.

[0090] In summary, the method for calculating the minimum coal consumption of a high back pressure heating unit provided in the above embodiment of the present invention can accurately calculate the minimum coal consumption corresponding to the user's actual electricity load demand, thereby greatly improving the user experience.

[0091] The second embodiment of the present invention also provides a method for calculating the minimum coal consumption of a high back-pressure heating unit. The method for calculating the minimum coal consumption of a high back-pressure heating unit provided in this embodiment differs from the method for calculating the minimum coal consumption of a high back-pressure heating unit provided in the first embodiment in that:

[0092] Specifically, in this embodiment, it should be noted that the step of calculating the corresponding exhaust steam heating parameters based on the exhaust steam heating amount on the unit side and the exhaust steam heat load on the heating network side based on the first preset rule includes:

[0093] extracting in real time a first value corresponding to the exhaust steam heat supply amount on the unit side and a second value corresponding to the exhaust steam heat load on the heating network side, and determining in real time whether the first value is greater than the second value;

[0094] If it is determined that the first value is greater than the second value, reducing the set value of the unit back pressure and continuing the iterative calculation;

[0095] If it is determined that the first value is less than the second value, increasing the set value of the unit back pressure and continuing the iterative calculation;

[0096] If it is determined that the first value is equal to the second value, the calculation is stopped, and the exhaust steam heating parameter is calculated based on the first value and the second value.

[0097] Specifically, in this embodiment, it should be noted that since both the unit-side exhaust steam heat supply and the network-side exhaust steam heat load have specific values, a corresponding comparison can be performed. Based on this, this embodiment extracts a first value corresponding to the unit-side exhaust steam heat supply and simultaneously extracts a second value corresponding to the network-side exhaust steam heat load. Based on this, the magnitude relationship between the current first and second values ​​can be determined in real time.

[0098] More specifically, if the first value is greater than the second value, it indicates that the unit backpressure is too high, and the current unit backpressure setting value needs to be reduced accordingly. Correspondingly, if the first value is equal to the second value, it indicates that the current unit backpressure is too low, and the current unit backpressure setting value needs to be increased accordingly. Furthermore, if the first value is equal to the second value, it indicates that the current unit backpressure setting value is reasonable and can keep the heating unit in optimal working condition. The calculation of the first and second values ​​can be stopped accordingly, as can the comparison between the first and second values. Based on this, the exhaust steam heating parameters can be calculated based on the first and second values ​​generated under the current unit backpressure.

[0099] Specifically, in this embodiment, it should be noted that the step of calculating the steam extraction amount required for different steam extraction ports corresponding to the heating unit according to the second preset rule includes:

[0100] Calculate the heat load of the heat network side steam extraction corresponding to the heating unit according to the inlet and outlet temperature difference of the preset heat network heater, and determine in real time whether the heat load of the heat network side steam extraction is equal to the heat absorption of the unit side steam extraction;

[0101] If it is determined in real time that the extraction steam heat load on the heating network side is equal to the extraction steam heat absorption on the unit side, the extraction steam amount required for different extraction steam ports corresponding to the heating unit is calculated.

[0102] Specifically, in this embodiment, it should be noted that, as shown in Figure 2, after the required exhaust steam heating parameters are obtained through the above steps, this embodiment will further calculate the heat load on the heating network side corresponding to the above heating unit based on the inlet and outlet temperature difference of the preset heating network heater inside the current heating unit. At the same time, it will determine in real time whether the current extraction heat load on the heating network side is equal to the extraction heat absorption amount on the current unit side.

[0103] Furthermore, if it is determined in real time that the current extraction steam heat load on the heating network side is equal to the extraction steam heat absorption on the current unit side, it means that the extraction steam volume of the current heating unit is in the optimal working state. At this time, it is only necessary to calculate the extraction steam volume required for different extraction steam ports corresponding to the current heating unit, and this extraction steam volume is the required optimal extraction steam volume.

[0104] In addition, in this embodiment, it should be noted that the step of calculating the steam extraction amount required by different steam extraction ports corresponding to the heating unit includes:

[0105] When the steam extraction amounts corresponding to different steam extraction ports are obtained, the steam extraction heating parameters corresponding to each of the steam extraction ports are obtained, and the coal consumption rate of the unit corresponding to each of the steam extraction ports is calculated based on the steam extraction amounts and the steam extraction heating parameters;

[0106] The coal consumption rates of the units corresponding to each of the steam extraction ports are compared to determine the corresponding optimal steam extraction port, which corresponds to the optimal steam extraction amount.

[0107] In addition, in this embodiment, it should be noted that after obtaining the steam extraction capacities corresponding to the different steam extraction ports adapted to the current heating unit in real time through the above steps, this embodiment further requires obtaining the steam extraction heating parameters corresponding to each current steam extraction port in real time. Based on this, the unit coal consumption rate corresponding to each steam extraction port can be calculated based on the current steam extraction heating parameters and the above steam extraction capacities. Specifically, the unit coal consumption rate can directly reflect the coal consumption required for each steam extraction port.

[0108] Based on this, the coal consumption rates of the units corresponding to each current steam extraction port are compared one by one, so that the steam extraction port with the smallest coal consumption rate of the unit can be compared. On this basis, the steam extraction port with the smallest coal consumption rate of the current unit can be set as the required optimal steam extraction port, and the optimal steam extraction port corresponds to the above-mentioned optimal steam extraction volume, which is convenient for subsequent calculations.

[0109] In addition, in this embodiment, it should be noted that the step of generating corresponding boundary conditions according to the optimal exhaust steam amount and the optimal extraction steam amount includes:

[0110] When the optimal exhaust steam amount and the optimal extraction steam amount are obtained, a minimum cooling flow rate corresponding to the optimal exhaust steam amount and the optimal extraction steam amount is determined, and a mapping relationship between the optimal exhaust steam amount, the optimal extraction steam amount, and the minimum cooling flow rate is established;

[0111] A change rule among the optimal exhaust steam amount, the optimal extraction steam amount and the minimum cooling flow rate is constructed based on the mapping relationship, and the boundary condition is generated according to the change rule.

[0112] In addition, in this embodiment, it should be noted that, as shown in FIG4 , a diagram of enthalpy-entropy of water vapor is shown. Based on this, the minimum cooling flow corresponding to the current optimal exhaust steam volume and the optimal extraction steam volume can be determined through this diagram. Specifically, the minimum cooling flow can be reflected in FIG4 . At the same time, a mapping relationship between the three needs to be established to facilitate subsequent processing.

[0113] Furthermore, a corresponding variation rule is constructed based on the above-mentioned optimal exhaust steam volume, optimal extraction steam volume, and minimum cooling flow rate, and the above-mentioned boundary conditions can be generated according to the variation rule. Specifically, the boundary conditions provided in this embodiment are: the greater the extraction steam volume, the smaller the cooling flow rate, and the smaller the cooling flow rate, the higher the exhaust steam temperature of the heating unit and the less available exhaust steam volume.

[0114] In this embodiment, it should be noted that the step of calculating the unit coal consumption rate corresponding to each steam extraction port according to the steam extraction amount and the steam extraction heating parameter includes:

[0115] Calculating the corresponding unit coal consumption according to the extraction steam volume and the extraction steam heating parameter, and calculating the unit coal consumption rate corresponding to the extraction steam port according to the unit coal consumption based on a first preset algorithm;

[0116] The expression of the first preset algorithm is:

[0117]

[0118] Among them, b tp，e Indicates the coal consumption rate of the unit, B tp，e represents the coal consumption of the unit, and P represents the power generation of the unit.

[0119] Among them, in this embodiment, it should be noted that after obtaining the extraction steam volume and extraction steam heating parameters in the above manner, the required unit coal consumption can be calculated based on the current two parameters. Based on this, the above formula can be used to calculate the unit coal consumption rate corresponding to each extraction steam port.

[0120] Furthermore, by comparing the coal consumption rate of each steam extraction port, the optimal steam extraction port required can be finally determined for subsequent processing.

[0121] In this embodiment, it should be noted that the expression for determining the corresponding total heating demand according to the heating network side parameters of the heating unit is:

[0122]

[0123] Among them, Q tp Indicates the total heat consumption of the unit, B tp represents the total fuel consumption, q net represents the low calorific value of fuel, Q0 represents the total heat consumption of the steam turbine, η b represents boiler efficiency, η p Indicates pipeline efficiency.

[0124] Among them, in this embodiment, it should be pointed out that the total heating demand of the current heating unit can be accurately calculated through the above formula. Based on this, the adaptive unit back pressure can be determined to further determine the optimal unit back pressure and heating parameters, and finally calculate the minimum coal consumption.

[0125] It should be pointed out that the implementation principle and some technical effects of the method provided in the second embodiment of the present invention are the same as those of the first embodiment. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding content provided in the first embodiment.

[0126] In summary, the method for calculating the minimum coal consumption of a high back pressure heating unit provided in the above embodiment of the present invention can accurately calculate the minimum coal consumption corresponding to the user's actual electricity load demand, thereby greatly improving the user experience.

[0127] Please refer to FIG4 , which shows a system for calculating the minimum coal consumption of a high back pressure heating unit according to a third embodiment of the present invention, wherein the system includes:

[0128] The selection module 12 is used to determine the corresponding total heating demand based on the heating network side parameters of the heating unit and select a unit back pressure within a preset adjustment range;

[0129] a calculation module 22 for calculating the corresponding exhaust steam heating capacity of the unit side and the exhaust steam heat load of the heating network side based on the unit back pressure and the actual operating conditions and theoretical operating conditions of the heating unit, and calculating the corresponding exhaust steam heating parameters based on the exhaust steam heating capacity of the unit side and the exhaust steam heat load of the heating network side according to a first preset rule, so as to calculate the optimal exhaust steam amount based on the exhaust steam heating parameters;

[0130] a comparison module 32 for calculating the steam extraction amount required for different steam extraction ports corresponding to the heating unit according to a second preset rule, and determining the corresponding optimal steam extraction amount by comparing the unit coal consumption rates of the different extraction ports under different steam extraction heating parameters;

[0131] The execution module 42 is configured to generate corresponding boundary conditions according to the optimal exhaust steam amount and the optimal extraction steam amount, and calculate the corresponding minimum coal burning amount according to the actual electric load demand based on the boundary conditions.

[0132] In the above-mentioned high back pressure heating unit minimum coal consumption calculation system, the calculation module 22 is specifically used to:

[0133] extracting in real time a first value corresponding to the exhaust steam heat supply amount on the unit side and a second value corresponding to the exhaust steam heat load on the heating network side, and determining in real time whether the first value is greater than the second value;

[0134] If it is determined that the first value is greater than the second value, reducing the set value of the unit back pressure and continuing the iterative calculation;

[0135] If it is determined that the first value is less than the second value, increasing the set value of the unit back pressure and continuing the iterative calculation;

[0136] If it is determined that the first value is equal to the second value, the calculation is stopped, and the exhaust steam heating parameter is calculated based on the first value and the second value.

[0137] In the above-mentioned system for calculating the minimum coal consumption of the high back pressure heating unit, the comparison module 32 is specifically used to:

[0138] Calculate the heat load of the heat network side steam extraction corresponding to the heating unit according to the inlet and outlet temperature difference of the preset heat network heater, and determine in real time whether the heat load of the heat network side steam extraction is equal to the heat absorption of the unit side steam extraction;

[0139] If it is determined in real time that the extraction steam heat load on the heating network side is equal to the extraction steam heat absorption on the unit side, the extraction steam amount required for different extraction steam ports corresponding to the heating unit is calculated.

[0140] In the above-mentioned system for calculating the minimum coal consumption of the high back pressure heating unit, the comparison module 32 is further specifically used for:

[0141] When the steam extraction amounts corresponding to different steam extraction ports are obtained, the steam extraction heating parameters corresponding to each of the steam extraction ports are obtained, and the coal consumption rate of the unit corresponding to each of the steam extraction ports is calculated based on the steam extraction amounts and the steam extraction heating parameters;

[0142] The coal consumption rates of the units corresponding to each of the steam extraction ports are compared to determine the corresponding optimal steam extraction port, which corresponds to the optimal steam extraction amount.

[0143] In the above-mentioned high back pressure heating unit minimum coal consumption calculation system, the execution module 42 is specifically used to:

[0144] When the optimal exhaust steam amount and the optimal extraction steam amount are obtained, a minimum cooling flow rate corresponding to the optimal exhaust steam amount and the optimal extraction steam amount is determined, and a mapping relationship between the optimal exhaust steam amount, the optimal extraction steam amount, and the minimum cooling flow rate is established;

[0145] A change rule among the optimal exhaust steam amount, the optimal extraction steam amount and the minimum cooling flow rate is constructed based on the mapping relationship, and the boundary condition is generated according to the change rule.

[0146] In the above-mentioned system for calculating the minimum coal consumption of the high back pressure heating unit, the comparison module 32 is further specifically used for:

[0147] Calculating the corresponding unit coal consumption according to the extraction steam volume and the extraction steam heating parameter, and calculating the unit coal consumption rate corresponding to the extraction steam port according to the unit coal consumption based on a first preset algorithm;

[0148] The expression of the first preset algorithm is:

[0149]

[0150] Among them, b tp，e Indicates the coal consumption rate of the unit, B tp，e represents the coal consumption of the unit, and P represents the power generation of the unit.

[0151] Among them, in the above-mentioned high back pressure heating unit minimum coal consumption calculation system, the expression for determining the corresponding total heating demand based on the heating network side parameters of the heating unit is:

[0152]

[0153] Among them, Q tp Indicates the total heat consumption of the unit, B tp represents the total fuel consumption, q net represents the low calorific value of fuel, Q0 represents the total heat consumption of the steam turbine, η b represents boiler efficiency, η p Indicates pipeline efficiency.

[0154] A fourth embodiment of the present invention provides a computer, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for calculating the minimum coal consumption of a high back pressure heating unit provided in the above embodiment is implemented.

[0155] A fifth embodiment of the present invention provides a readable storage medium having a computer program stored thereon, wherein when the program is executed by a processor, the method for calculating the minimum coal consumption of a high back pressure heating unit provided in the above embodiment is implemented.

[0156] In summary, the method and system for calculating the minimum coal consumption of a high back pressure heating unit provided in the above embodiments of the present invention can accurately calculate the minimum coal consumption corresponding to the user's actual electricity load demand, thereby greatly improving the user experience.

[0157] It should be noted that the above modules can be functional modules or program modules, and can be implemented through software or hardware. For modules implemented through hardware, the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0158] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0159] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting, or processing it in another suitable manner as necessary, and then storing it in a computer memory.

[0160] It should be understood that various components of the present invention may be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods may be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof may be used: a discrete logic circuit having logic gate circuits for implementing logic functions on data signals, an application-specific integrated circuit having suitable combinational logic gate circuits, a programmable gate array (PGA), a field-programmable gate array (FPGA), etc.

[0161] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0162] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for calculating the minimum coal consumption of a high back pressure heating unit, characterized in that: The method comprises: Determine the corresponding total heating demand according to the heat network side parameters of the heating unit, and select a unit back pressure within the preset adjustment range; Based on the unit back pressure, the corresponding exhaust steam heating amount on the unit side and the exhaust steam heat load on the heating network side are calculated according to the actual operating conditions and theoretical operating conditions of the heating unit, and based on the first preset rule, the corresponding exhaust steam heating parameters are calculated according to the exhaust steam heating amount on the unit side and the exhaust steam heat load on the heating network side, so as to calculate the optimal exhaust steam amount through the exhaust steam heating parameters; The steam extraction amount required by different steam extraction ports corresponding to the heating unit is calculated according to the second preset rule, and the corresponding optimal steam extraction amount is determined by comparing the unit coal consumption rates of different steam extraction ports under different steam extraction heating parameters; Corresponding boundary conditions are generated according to the optimal exhaust steam amount and the optimal extraction steam amount, and the corresponding minimum coal burning amount is calculated according to the actual electric load demand based on the boundary conditions.

2. The method for calculating the minimum coal consumption of a high back pressure heating unit according to claim 1 is characterized in that: The step of calculating the corresponding exhaust steam heating parameters based on the exhaust steam heating capacity of the unit side and the exhaust steam heat load of the heating network side based on the first preset rule comprises: Extracting in real time a first value corresponding to the exhaust steam heat supply amount on the unit side and a second value corresponding to the exhaust steam heat load on the heating network side, and determining in real time whether the first value is greater than the second value; If it is determined that the first value is greater than the second value, the set value of the back pressure of the unit is reduced, and the iterative calculation is continued; If it is determined that the first value is less than the second value, the set value of the back pressure of the unit is increased, and the iterative calculation is continued; If it is determined that the first value is equal to the second value, the calculation is stopped, and the exhaust steam heating parameter is calculated according to the first value and the second value.

3. The method for calculating the minimum coal consumption of a high back pressure heating unit according to claim 1 is characterized in that: The step of calculating the steam extraction amount required by different steam extraction ports corresponding to the heating unit according to the second preset rule comprises: Calculate the heat load of the heat network side steam extraction corresponding to the heating unit according to the inlet and outlet temperature difference of the preset heat network heater, and judge in real time whether the heat load of the heat network side steam extraction is equal to the heat absorption of the unit side steam extraction; If it is determined in real time that the extraction steam heat load on the heating network side is equal to the extraction steam heat absorption on the unit side, the extraction steam quantity required for different extraction steam ports corresponding to the heating unit is calculated.

4. The method for calculating the minimum coal consumption of a high back pressure heating unit according to claim 3 is characterized in that: The step of calculating the steam extraction amount required by different steam extraction ports corresponding to the heating unit comprises: When the steam extraction amounts corresponding to different steam extraction ports are obtained, the steam extraction heating parameters corresponding to each of the steam extraction ports are obtained, and the unit coal consumption rate corresponding to each of the steam extraction ports is calculated according to the steam extraction amounts and the steam extraction heating parameters; The coal consumption rates of the units corresponding to each of the steam extraction ports are compared to determine the corresponding optimal steam extraction port, and the optimal steam extraction port corresponds to the optimal steam extraction amount.

5. The method for calculating the minimum coal consumption of a high back pressure heating unit according to claim 1 is characterized in that: The step of generating corresponding boundary conditions according to the optimal exhaust steam amount and the optimal extraction steam amount comprises: When the optimal exhaust steam amount and the optimal extraction steam amount are obtained, a minimum cooling flow rate corresponding to the optimal exhaust steam amount and the optimal extraction steam amount is determined, and a mapping relationship between the optimal exhaust steam amount, the optimal extraction steam amount and the minimum cooling flow rate is established; A change rule between the optimal exhaust steam amount, the optimal extraction steam amount and the minimum cooling flow rate is constructed based on the mapping relationship, and the boundary condition is generated according to the change rule.

6. The method for calculating the minimum coal consumption of a high back pressure heating unit according to claim 4 is characterized in that: The step of calculating the unit coal consumption rate corresponding to each of the steam extraction ports according to the steam extraction amount and the steam extraction heating parameter comprises: Calculating the corresponding unit coal consumption according to the extraction steam amount and the extraction steam heating parameter, and calculating the unit coal consumption rate corresponding to the extraction steam port according to the unit coal consumption based on a first preset algorithm; The expression of the first preset algorithm is: ， Among them, b tp，e represents the coal consumption rate of the unit, B tp，e represents the coal consumption of the unit, and P represents the power generation of the unit.

7. The method for calculating the minimum coal consumption of a high back pressure heating unit according to claim 1, characterized in that: The expression for determining the corresponding total heating demand according to the heating network side parameters of the heating unit is: ， Among them, Q tp Indicates the total heat consumption of the unit, B tp represents the total fuel consumption, q net represents the low calorific value of fuel, Q0 represents the total heat consumption of the steam turbine, η b represents boiler efficiency, η p Indicates pipeline efficiency.

8. A system for calculating the minimum coal consumption of a high back pressure heating unit, characterized in that: The system comprises: A selection module is used to determine the corresponding total heating demand according to the heating network side parameters of the heating unit, and select a unit back pressure within a preset adjustment range; a calculation module, configured to calculate the corresponding exhaust steam heating amount on the unit side and the exhaust steam heat load on the heating network side respectively based on the unit back pressure according to the actual operating conditions and theoretical operating conditions of the heating unit, and calculate the corresponding exhaust steam heating parameters according to the exhaust steam heating amount on the unit side and the exhaust steam heat load on the heating network side based on a first preset rule, so as to calculate the optimal exhaust steam amount through the exhaust steam heating parameters; A comparison module, used for calculating the steam extraction amount required for different steam extraction ports corresponding to the heating unit according to a second preset rule, and determining the corresponding optimal steam extraction amount by comparing the unit coal consumption rates of different steam extraction ports under different steam extraction heating parameters; The execution module is used to generate corresponding boundary conditions according to the optimal exhaust steam amount and the optimal extraction steam amount, and calculate the corresponding minimum coal burning amount according to the actual electric load demand based on the boundary conditions.

9. A computer comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for calculating the minimum coal consumption of a high back pressure heating unit as described in any one of claims 1 to 7 is implemented.

10. A readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for calculating the minimum coal consumption of a high back pressure heating unit as described in any one of claims 1 to 7 is implemented.

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