Biomass energy on-grid electric quantity calculation method and system for coal-fired coupling biomass power generation

Abstract

The application relates to the technical field of power grids, and provides a coal-biomass coupling power supply quantity and grid-connected power quantity calculation method and system, which comprises the following steps: calculating low-grade heat quantity of biomass gas, biomass gas inlet furnace sensible heat and condensate water heat absorption quantity, and calculating biomass gas coupling energy based on the three parameters; calculating a real-time converted pure condensing working condition standard coal consumption rate of a coal-fired unit; calculating a real-time power generation power of biomass energy based on and; calculating real-time auxiliary power of the coal-fired unit except a coal conveying and fuel preparation system and a heating system based on and; and calculating a biomass energy grid-connected power quantity based on and. The application embodiment reduces the error between the calculated value and the actual value of the grid-connected power quantity.

Description

Technical Field

[0001] This application relates to the field of power grid technology, and in particular to a method and system for calculating the electricity generated by coal-fired power coupled with biomass power grid connection. Background Technology

[0002] Coal-fired power generation coupled with biomass gasification involves pyrolyzing and gasifying particulate fuels such as agricultural and forestry waste in a high-speed circulating fluidized bed gasifier to generate combustible gas, which is then burned in existing coal-fired boilers at thermal power plants. This process utilizes the boiler, turbine, and generator systems of the coal-fired power generation system to achieve efficient power generation. The calculation of combustible gas calorific value based on online monitoring data of the biomass gas is used to convert this calorific value into electricity generated by the biomass energy fed into the grid. Specifically, the current method uses the gas calorific value converted into electricity to calculate the biomass energy generated by the grid, as shown in the following formula: Biomass Energy Grid Connection. . The coal consumption for power generation in this method uses the average value of the previous year, which lacks real-time accuracy, resulting in a large error between the calculated and actual values. Furthermore, current biomass-coupled energy calculations do not consider the heat absorption of condensate water or the allocated power consumption of the coal conveying and pulverizing systems, leading to a significant error between the calculated and actual on-grid power consumption. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this application is to provide a method and system for calculating the electricity generated by coal-fired power coupled with biomass power generation, thereby resolving the technical issues mentioned above.

[0004] In a first aspect, embodiments of this application provide a method for calculating the electricity generated by coal-fired power coupled with biomass power generation, including:

[0005] Calculate the lower heating value of biomass gas Sensible heat from biomass gas entering the furnace And the heat absorbed by condensate ;

[0006] Based on the lower heating value of the biomass gas Sensible heat from biomass gas entering the furnace and the heat absorbed by condensate Calculate the coupled energy of biomass gas ;

[0007] Calculate the standard coal consumption rate for power generation under pure condensing conditions in real time based on coal-fired power units. ;

[0008] Based on the biomass gas coupling energy And the standard coal consumption rate for power generation under pure condensing conditions calculated in real time based on the coal-fired power units. Calculate real-time power generation of biomass energy ;

[0009] The real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system is calculated according to the biomass gas coupled energy ;

[0010] The real-time power generation of the biomass energy is obtained and the real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system is calculated according to the biomass gas coupled energy The biomass energy on-grid power is calculated.

[0011] Further, the biomass gas low calorific value , the biomass gas inlet sensible heat and the condensate heat absorption amount are calculated according to the biomass gas coupled energy The step of calculating the biomass gas coupled energy

[0012] The biomass gas coupled energy is calculated according to the following formula ;

[0013] ;

[0014] Wherein, is the specific heat coefficient of the condensate of the coal-based power unit, is the boiler efficiency of the coal-based power unit.

[0015] Further, the step of calculating the condensate heat absorption amount includes:

[0016] ;

[0017] Wherein, is the specific heat capacity of water, is the condensate flow, is the condensate outlet temperature of the oil-water heat exchanger, is the water supply pump inlet main pipe temperature, represents the temperature rise.

[0018] Further, the step of calculating the real-time equivalent standard coal consumption rate of the coal-based power unit under the pure condensation condition includes:

[0019] The rated load standard coal consumption rate of the coal-based power unit under the pure condensation condition is obtained ;

[0020] The dynamic load correction coefficient of the coal-based power unit under the corresponding load is calculated ;

[0021] The rated load standard coal consumption rate of the coal-based power unit under the pure condensation condition is obtained And the dynamic load correction coefficient under the corresponding load of the coal-based power unit Calculate the standard coal consumption rate of the coal-based power unit under the real-time conversion pure condensing condition .

[0022] Further, the step of calculating the dynamic load correction coefficient under the corresponding load of the coal-based power unit Comprise:

[0023] Find the minimum interval in which the current dynamic load coefficient of the coal-based power unit is located through the pre-constructed lookup table; wherein the lookup table stores a plurality of dynamic load correction coefficients corresponding to the dynamic load coefficient of the coal-based power unit;

[0024] Obtain the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval through the lookup table;

[0025] Based on the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval, calculate the dynamic load correction coefficient of the current coal-based power unit by interpolation.

[0026] Further, the real-time power generation of the biomass energy And the real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system After the step of calculating the biomass energy on-grid power, the method further comprises:

[0027] Obtain the actual on-grid power;

[0028] Determine whether the difference between the calculated biomass energy on-grid power and the actual on-grid power is less than a preset threshold value;

[0029] If not, recalculate the on-grid power by taking a value between the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval according to a preset step, and when the difference between the recalculated on-grid power and the actual on-grid power is less than the preset threshold value, store the corresponding dynamic load correction coefficient as the dynamic load correction coefficient corresponding to the current dynamic load coefficient of the coal-based power unit and in the lookup table; or when there is no value between the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval that makes the difference between the recalculated on-grid power and the actual on-grid power less than the preset threshold value, store the dynamic load correction coefficient corresponding to the minimum difference as the dynamic load correction coefficient corresponding to the current dynamic load coefficient of the coal-based power unit and in the lookup table.

[0030] Further, the step of calculating the real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system Comprise:

[0031] Obtain real-time power generation of coal-fired power units ;

[0032] Calculate the real-time power consumption of coal-fired power units ;

[0033] Based on the biomass gas coupling energy The real-time power generation capacity of the coal-fired power units mentioned above The aforementioned method relies on real-time calculation of the standard coal consumption rate for power generation under pure condensing conditions using coal-fired power units. and based on the real-time power consumption of coal-fired power units Calculate the real-time plant power consumption of the coal-fired power unit, excluding coal conveying, fuel preparation, and heating systems, based on the energy allocation of biomass gas coupled with fuel. .

[0034] Furthermore, the energy coupled based on the biomass gas The real-time power generation capacity of the coal-fired power units mentioned above The aforementioned method relies on real-time calculation of the standard coal consumption rate for power generation under pure condensing conditions using coal-fired power units. and based on the real-time power consumption of coal-fired power units Calculate the real-time plant power consumption of the coal-fired power unit, excluding coal conveying, fuel preparation, and heating systems, based on the energy allocation of biomass gas coupled with fuel. The steps include:

[0035] The real-time plant power consumption of the coal-fired power unit, excluding the coal conveying and fuel preparation systems and the heating system, is calculated according to the following formula based on the energy allocated by biomass gas coupling. :

[0036] ;

[0037] in, This refers to the ratio of the plant power consumption of the coal conveying and fuel preparation system to the plant power consumption of the coal-fired power units under rated operating conditions when the biomass gasification island is not in operation. When the biomass gasification island is not in operation, this refers to the ratio of the plant power consumption of the heating system under the rated operating conditions of the coal-fired power units to the plant power consumption of the coal-fired power units under the rated operating conditions.

[0038] Furthermore, the real-time power generation based on the biomass energy And the real-time plant power consumption of the coal-fired power unit, excluding the coal conveying and fuel preparation system and the heating system, allocated according to the biomass gas coupling energy. The steps for calculating the amount of biomass energy used in the grid include:

[0039] Obtaining real-time plant power of biomass gasification island ;

[0040] The biomass energy on-grid power is calculated according to the following formula :

[0041] ;

[0042] Wherein, dt is a time differential.

[0043] In a second aspect, the embodiment of the present application provides a biomass energy on-grid power calculation system for coal-biomass coupled power generation, and the system comprises:

[0044] A first calculation module is configured to calculate low-grade heat of biomass gas, biomass gas heat entering a furnace, and condensate heat absorption. ;

[0045] A second calculation module is configured to calculate biomass gas coupling energy based on the low-grade heat of biomass gas, the biomass gas heat entering the furnace, and the condensate heat absorption. ; ;

[0046] A third calculation module is configured to calculate a standard coal consumption rate of a coal-based power unit under real-time conversion of a pure condensing condition. ;

[0047] A fourth calculation module is configured to calculate real-time power generation power of biomass energy based on the biomass gas coupling energy and the standard coal consumption rate of the coal-based power unit under real-time conversion of the pure condensing condition. ; ;

[0048] A fifth calculation module is configured to calculate real-time plant power of the coal-based power unit except a coal conveying and fuel preparation system and a heating system based on the biomass gas coupling energy. ;

[0049] A sixth calculation module is configured to calculate biomass energy on-grid power based on the real-time power generation power of biomass energy and the real-time plant power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system based on the biomass gas coupling energy. ;

[0050] ​​​​​​The application embodiment calculates the real-time standard coal consumption rate of power generation under the real-time conversion pure condensing condition of the coal-based power unit, uses the real-time coal consumption rate to replace the annual average value, solves the problem of large error between the calculated value and the actual value caused by the real-time insufficiency of coal consumption, and reduces the error between the calculated value and the actual value. The biomass gas coupled energy is calculated based on the low heat value of the biomass gas, the biomass gas inlet sensible heat and the condensate water heat absorption amount, the condensate water heat absorption amount is considered, the problem of large error between the calculated value and the actual value of the on-grid power caused by not considering the condensate water heat absorption amount is solved, and the error between the calculated value and the actual value is reduced. The real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system is calculated by allocating the biomass gas coupled energy, and the biomass energy on-grid power is calculated based on the real-time power generation power of the biomass energy and the real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system allocated by the biomass gas coupled energy, the real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system allocated by the biomass gas coupled energy is considered, the problem of large error between the calculated value and the actual value of the on-grid power caused by not considering the allocated auxiliary power of the coal conveying and fuel preparation system is solved, and the error between the calculated value and the actual value is reduced. The application embodiment considers the low heat value of the biomass gas, the inlet sensible heat, the condensate water heat absorption amount, uses the real-time coal consumption rate, and allocates the related auxiliary power, multi-dimensionally perfects the calculation logic, greatly reduces the error between the calculated value and the actual value, and makes the biomass energy on-grid power calculation more in line with the actual production situation. The real-time conversion power generation standard coal consumption rate, the real-time auxiliary power and other parameters are calculated to replace the original annual average and other non-real-time data, so that the on-grid power calculation can dynamically reflect the unit operation state, adapt to the real-time production demand, and improve the accuracy of biomass energy utilization monitoring and metering in the power generation process. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to make the technical solutions of the application clearer, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creating any inventive labor.

[0052] Figure 1 FIG. 1 is a flowchart of a biomass on-grid power calculation method provided by an embodiment of the application. DETAILED DESCRIPTION

[0053] In order to make the technical solutions of the application clearer, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creating any inventive labor.

[0054] Those skilled in the art can understand that the singular forms "a", "an", "the" and "said" used herein also include the plural forms unless specifically stated otherwise. It should be further understood that the use of the phrase "comprising" in the specification of the present application means that the features, integers, steps, operations, elements, modules and / or components exist, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, components and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intermediate elements. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any module of the associated list and all combinations thereof.

[0055] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as that generally understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0056] For ease of understanding, the relevant terms are first explained as follows:

[0057] Biomass includes agricultural and forestry waste, household garbage, and biomass resources such as sludge from sewage treatment plants and water bodies.

[0058] Coal-biomass combined power generation refers to the addition of biomass raw material related systems and equipment in coal-fired power generating units, and coal and biomass raw materials jointly providing heat for power generation. Biomass gas refers to synthetic gas generated by biomass gasification, pyrolysis and other processes.

[0059] Biomass power online electricity refers to the biomass power online electricity converted in the coal-biomass combined power generation process within a statistical period.

[0060] Biomass gasification island refers to the process system and equipment designed for biomass storage and pretreatment, biomass gasification, biomass gas cooling, dust removal and transportation in a coal-biomass combined power plant.

[0061] The quality coefficient is the ratio of the theoretical work capacity of the working medium to the theoretical work capacity of the superheated steam at the outlet of the boiler superheater.

[0062] Please refer to Figure 1 The embodiment of the present application provides a coal-biomass combined online electricity calculation method, comprising steps S1-S6:

[0063] S1. Calculate the lower heating value of biomass gas. Sensible heat from biomass gas entering the furnace and the heat absorbed by condensate .

[0064] In step S1, the lower heating value of the fuel gas is... It uses carbon monoxide (CO) and hydrogen. methane ethylene Acetylene Calculation of five gases. Lower heating value of biomass fuel gas. The product of the lower heating value of biomass gas per standard cubic meter and the biomass gas flow rate can be calculated using the following formula: ;in, This represents the lower heating value (kJ / m³) provided by the complete combustion of the combustible components (carbon monoxide, hydrogen, methane, ethylene, and acetylene) in one standard cubic meter of biomass gas. ); The volumetric flow rate of biomass gas under standard conditions ( Sensible heat from biomass gas entering the furnace. The calculations used eight gases: carbon monoxide, hydrogen, methane, ethylene, acetylene, oxygen, carbon dioxide, and nitrogen. Sensible heat was calculated using the difference between the pre-boiler gas temperature and the local annual average temperature. Specific heat capacity was calculated using temperature interpolation. (Sensible heat of biomass gas entering the boiler...) It can be calculated using the following formula: ;in, Sensible heat per standard cubic meter of biomass gas ( ). Where t is the inlet temperature (°C) of biomass gas before it enters the coal-fired boiler. The isobaric volumetric specific heat capacity of each component j in the gas [kJ / ( ℃) The local average annual ambient temperature (°C) is used. The steps for calculating the heat absorbed by condensate include:

[0065] ;

[0066] in, For the specific heat capacity of water, For condensate flow rate, This refers to the condensate outlet temperature of the oil-water heat exchanger. The temperature of the inlet header of the water supply pump. This indicates a temperature rise.

[0067] S2, Based on the lower heating value of the biomass gas Sensible heat from biomass gas entering the furnace and condensing water heat absorption Calculating biomass gas coupling energy .

[0068] In step S2, the biomass gas low calorific value , biomass gas into the stove sensible heat and condensing water heat absorption The step of calculating biomass gas coupling energy includes:

[0069] The biomass gas coupling energy is calculated according to the following formula:

[0070]

[0071] Wherein, is the specific heat coefficient of condensing water of the coal-based power unit, is the boiler efficiency of the coal-based power unit.

[0072] Wherein, can be calculated according to the following formula:

[0073]

[0074] Wherein, is the specific enthalpy of the superheated steam at the boiler outlet (kJ / kg), is the specific enthalpy of the extracted steam expelled by the condensing water entering the heat exchanger (kJ / kg); is the specific enthalpy of the exhaust steam under the rated back pressure condition of the coal-based power unit (kJ / kg), is the specific entropy of the superheated steam at the boiler outlet , is the specific entropy of the extracted steam expelled by the condensing water entering the heat exchanger, is the specific entropy of the exhaust steam under the rated back pressure condition of the coal-based power unit [kJ / (kg )], is the average annual ambient temperature in the local area (°C).

[0075] S3, calculating the standard coal consumption rate of the coal-based power unit under the real-time converted pure condensing condition .

[0076] In step S3, the step of calculating the standard coal consumption rate of the coal-based power unit under the real-time converted pure condensing condition includes:

[0077] Obtaining the standard coal consumption rate of the coal-based power unit under the pure condensing condition at rated load ;

[0078] ​The dynamic load correction coefficient of the coal-based power unit under the corresponding load is calculated ;

[0079] The standard coal consumption rate of the coal-based power unit under the rated load of the pure condensing condition is calculated according to the standard coal consumption rate of the coal-based power unit under the rated load of the pure condensing condition and the dynamic load correction coefficient of the coal-based power unit under the corresponding load The standard coal consumption rate of the coal-based power unit under the real-time converted pure condensing condition is calculated .

[0080] Specifically, the standard coal consumption rate of the coal-based power unit under the real-time converted pure condensing condition is calculated according to the following formula :

[0081] .

[0082] Specifically, the step of calculating the dynamic load correction coefficient of the coal-based power unit under the corresponding load includes:

[0083] The minimum interval in which the current dynamic load coefficient of the coal-based power unit is located is searched through a pre-constructed lookup table, wherein the lookup table stores a plurality of dynamic load correction coefficients corresponding to dynamic load coefficients of the coal-based power unit;

[0084] The dynamic load correction coefficients corresponding to the two endpoints of the minimum interval are obtained through the lookup table;

[0085] Based on the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval, the dynamic load correction coefficient of the current coal-based power unit is calculated by interpolation.

[0086] In the embodiments of the present application, the dynamic load correction coefficient of the current coal-based power unit is quickly obtained by searching the minimum interval in which the current dynamic load coefficient of the coal-based power unit is located through a pre-constructed lookup table storing a plurality of dynamic load correction coefficients corresponding to dynamic load coefficients of the coal-based power unit, obtaining the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval through the lookup table, and calculating the dynamic load correction coefficient of the current coal-based power unit by interpolation based on the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval, thereby laying a foundation for subsequent online power calculation.

[0087] S4, the real-time power generation power of the biomass energy is calculated based on the biomass gas coupling energy and the standard coal consumption rate of the coal-based power unit under the real-time converted pure condensing condition .

[0088] In step S4, the real-time power generation power of the biomass energy is calculated based on the biomass gas coupling energy ​​the real-time standard coal consumption rate of the coal-based power generating unit under the real-time pure condensing condition the real-time power generation of the biomass energy The step of calculating the real-time power generation of the biomass energy includes:

[0089] The real-time power generation of the biomass energy is calculated according to the following formula :

[0090] .

[0091] S5, calculating the real-time auxiliary power of the coal-based power generating unit except the coal conveying and fuel preparation system and the heating system, which is allocated according to the biomass gas coupling energy .

[0092] In step S5, the step of calculating the real-time auxiliary power of the coal-based power generating unit except the coal conveying and fuel preparation system and the heating system, which is allocated according to the biomass gas coupling energy includes:

[0093] obtaining the real-time power generation of the coal-based power generating unit ;

[0094] calculating the real-time auxiliary power of the coal-based power generating unit ;

[0095] based on the biomass gas coupling energy (GJ / s), the real-time power generation of the coal-based power generating unit (kW), the real-time standard coal consumption rate of the coal-based power generating unit under the real-time pure condensing condition (g / kW·h), and the real-time auxiliary power of the coal-based power generating unit (kW), the real-time auxiliary power of the coal-based power generating unit except the coal conveying and fuel preparation system and the heating system, which is allocated according to the biomass gas coupling energy (kW).

[0096] Specifically, the real-time auxiliary power of the coal-based power generating unit except the coal conveying and fuel preparation system and the heating system, which is allocated according to the biomass gas coupling energy, is calculated according to the following formula :

[0097]

[0098] wherein, is the ratio of the auxiliary power of the coal conveying and fuel preparation system under the rated condition of the coal-based power generating unit to the auxiliary power of the coal-based power generating unit under the rated condition of the coal-based power generating unit when the biomass gasification island is not put into operation, The ratio of the power of the heating system to the power of the coal power unit under rated conditions. and The test should be provided by a qualified testing agency and should be updated every 5-10 years.

[0099] The real-time power of the coal power unit The ratio is calculated according to the following formula:

[0100] ;

[0101] The real-time power of the coal power unit The real-time power of the coal power unit The real-time power of the biomass gasification island.

[0102] S6, based on the real-time power of the biomass energy and the real-time power of the coal power unit excluding the coal conveying and fuel preparation system and the heating system Calculate the biomass energy online power.

[0103] In step S6, based on the real-time power of the biomass energy and the real-time power of the coal power unit excluding the coal conveying and fuel preparation system and the heating system The step of calculating the biomass energy online power includes:

[0104] The real-time power of the biomass gasification island ;

[0105] The biomass energy online power is calculated according to the following formula: :

[0106] dt;

[0107] Where dt is the time differential.

[0108] The application embodiment calculates the real-time standard coal consumption rate of power generation under the real-time conversion pure condensing condition of the coal-based power unit, uses the real-time coal consumption rate to replace the annual average value, solves the problem of large error between the calculation value and the actual value caused by the lack of real-time coal consumption, and reduces the error between the calculation value and the actual value. The biomass gas coupling energy is calculated based on the low heat value of the biomass gas, the biomass gas inlet sensible heat and the condensate water heat absorption amount, the condensate water heat absorption amount is considered, the problem of large error between the calculation value and the actual value of the on-grid power caused by not considering the condensate water heat absorption amount is solved, and the error between the calculation value and the actual value is reduced. The real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system is calculated by allocating the biomass gas coupling energy, and the biomass energy on-grid power is calculated based on the real-time power generation power of the biomass energy and the real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system allocated by the biomass gas coupling energy, the real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system allocated by the biomass gas coupling energy is considered, the problem of large error between the calculation value and the actual value of the on-grid power caused by not considering the allocated auxiliary power of the coal conveying and fuel preparation system is solved, and the error between the calculation value and the actual value is reduced. The application embodiment considers the low heat value of the biomass gas, the inlet sensible heat, the condensate water heat absorption amount, uses the real-time coal consumption rate, and allocates the related auxiliary power, so that the calculation logic is improved in multiple dimensions, the error between the calculation value and the actual value is greatly reduced, the biomass energy on-grid power calculation is more in line with the actual production situation. The real-time conversion power generation standard coal consumption rate, the real-time auxiliary power and other parameters are calculated to replace the original annual average and other non-real-time data, so that the on-grid power calculation can dynamically reflect the unit operation state, adapt to the real-time production demand, and improve the accuracy of biomass energy utilization monitoring and metering in the power generation process.

[0109] In an embodiment, the biomass energy real-time power generation power is calculated based on the real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system allocated by the biomass gas coupling energy and the real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system allocated by the biomass gas coupling energy After the step of calculating the biomass energy on-grid power, the method further comprises:

[0110] obtaining the actual on-grid power;

[0111] determining whether the difference between the calculated biomass energy on-grid power and the actual on-grid power is less than a preset threshold value;

[0112] If not less than, the online power is recalculated according to a preset step between the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval, when the difference between the recalculated online power and the actual online power is less than a preset threshold, the corresponding dynamic load correction coefficient is stored as the dynamic load correction coefficient corresponding to the current dynamic load coefficient of the coal-fired power unit and stored in the lookup table; or when there is no value between the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval that makes the difference between the recalculated online power and the actual online power less than the preset threshold, the dynamic load correction coefficient corresponding to the minimum difference is stored as the dynamic load correction coefficient corresponding to the current dynamic load coefficient of the coal-fired power unit and stored in the lookup table.

[0113] In the embodiments of the present application, the minimum difference is obtained by comparing the differences between the recalculated online power and the actual online power. The lookup table is initialized by a preset empirical value and then dynamically updated. The dynamic updating of the lookup table in the embodiments of the present application can quickly and more accurately obtain the dynamic load correction coefficient that makes the online power and the actual power more close, so that the calculated online power and the actual power are more close.

[0114] In a second aspect, the embodiments of the present application provide a biomass online power calculation system for coal-fired power coupled with biomass power generation, the system comprising:

[0115] A first calculation module for calculating the low calorific value of biomass gas , the sensible heat of biomass gas into the furnace , and the condensate heat absorption ;

[0116] A second calculation module for calculating the biomass gas coupling energy based on the low calorific value of biomass gas , the sensible heat of biomass gas into the furnace , and the condensate heat absorption ; ;

[0117] A third calculation module for calculating the real-time conversion standard coal consumption rate of the coal-fired power unit under the real-time conversion pure condensation working condition ;

[0118] A fourth calculation module for calculating the real-time biomass power generation power based on the biomass gas coupling energy and the real-time conversion standard coal consumption rate of the coal-fired power unit under the real-time conversion pure condensation working condition ; ;

[0119] The fifth calculation module is configured to calculate the real-time auxiliary power of the coal-based power generating unit except the coal conveying and fuel preparation system and the heating system based on the biomass gas coupling energy allocation ;

[0120] The sixth calculation module is configured to calculate the biomass energy online power based on the real-time power generation power of the biomass energy and the real-time auxiliary power of the coal-based power generating unit except the coal conveying and fuel preparation system and the heating system based on the biomass gas coupling energy allocation .

[0121] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware, and the computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, the processes of the above-mentioned embodiments can be included. Any reference to memory, storage, database or other medium provided in the present application and used in the embodiments can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM) and memory bus dynamic RAM (RDRAM) and the like.

[0122] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, device, article or method including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such a process, device, article or method. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, device, article or method including the element.

[0123] The above merely describes the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made according to the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

Claims

1. A method for calculating the online biomass power generation of coal-biomass power generation, characterized in that, The method comprises: Calculating the lower heating value of a biomass gas , the sensible heat of the biomass gas into the furnace and the condensation water absorption heat ; Based on the low heating value of the biomass gas , biomass gas into the furnace sensible heat and condensate water heat absorption Calculate the biomass gas coupling energy ; Calculating the real-time standard coal consumption rate of coal-fired power units under the condition of pure condensing conversion ; Coupling energy based on the biomass gas And the real-time conversion of the power generation standard coal consumption rate of the coal-fired unit under the pure condensing condition Calculate the real-time power generation power of biomass energy ; The real-time auxiliary power of the coal-fired unit coupled with the biomass gas is calculated and allocated ; Real-time power generation based on the biomass energy Real-time auxiliary power of the power plant except coal transportation and fuel preparation system and heating system of the coal-fired unit coupled with biomass gas Calculate the biomass energy online power The lower heating value based on the biomass gas Sensible heat from biomass gas entering the furnace and the heat absorbed by condensate Calculate the coupled energy of biomass gas The steps include: The coupled energy of the biomass gas is calculated according to the following formula ; ； wherein, is the enthalpy of the condensate of the coal-based power unit, is the boiler efficiency of the coal-based power unit; ; wherein, is the specific enthalpy of the superheated steam at the outlet of the boiler, is the specific enthalpy of the extraction steam displaced by the condensate entering the heat exchanger; is the specific enthalpy of the exhaust steam at the rated back pressure condition of the coal-fired unit, is the specific entropy of the superheated steam at the outlet of the boiler, is the specific entropy of the extraction steam displaced by the condensate entering the heat exchanger, is the specific entropy of the exhaust steam at the rated back pressure condition of the coal-fired unit, is the average annual ambient temperature at the site. The calculation relies on the real-time conversion of the standard coal consumption rate of the coal-fired generating unit under the pure condensing condition The steps include: Obtaining standard coal consumption rate of coal-fired power unit under rated load and pure condensing condition ; Computing dynamic load correction factors for coal-fired generating units at corresponding loads ; According to the standard coal consumption rate of the coal-based power unit under the rated load of the pure condensing condition And the dynamic load correction coefficient of the coal-based power unit under the corresponding load Calculate the standard coal consumption rate of the coal-based power unit under the real-time equivalent pure condensing condition ; The calculation is based on the real-time plant power consumption of the coal-fired power unit, excluding the coal conveying and fuel preparation systems and the heating system, allocated according to the coupled energy of biomass gas. The steps include: Acquiring real-time power generation of coal-fired power unit ; Calculating real-time auxiliary power of coal-fired power unit ; The biomass gas coupling energy is based on The real-time power generation of the coal-based power unit The real-time standard coal consumption rate of the coal-based power unit under the real-time converted pure condensing working condition The real-time auxiliary power of the coal-based power unit The real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system is calculated according to the biomass gas coupling energy ; wherein, ； wherein, is the ratio of the power consumption of the coal conveying and fuel preparation system under the rated condition of the coal-fired power unit to the power consumption of the coal-fired power unit under the rated condition when the biomass gasification island is not in operation, is the ratio of the power consumption of the heating system under the rated condition of the coal-fired power unit to the power consumption of the coal-fired power unit under the rated condition when the biomass gasification island is not in operation. The biomass energy real-time power generation is based on In addition to the coal conveying and fuel preparation system and the heating system, the real-time auxiliary power of the coal-fired unit coupled with the biomass gas energy is allocated The step of calculating the biomass energy online power includes: Obtaining biomass gasification island real-time plant power ; The biomass energy on-grid power is calculated according to the following formula : ; Wherein, dt is the time differential.

2. The method of claim 1, wherein the method is a method of calculating the amount of biomass energy on-grid electricity in coal-fired coupled biomass power generation, characterized by, The step of calculating the condensate water heat absorption amount comprises: ； wherein, Cp is the specific heat of water, M is the condensate flow rate, Tc is the condensate outlet temperature of the oil-water heat exchanger, Tin is the inlet main temperature of the water supply pump, ΔT represents the temperature rise.

3. The method of claim 1, wherein the method is a method of calculating the amount of biomass energy on-grid electricity in coal-fired coupled biomass power generation, characterized by, The calculation relies on the dynamic load correction coefficient of the coal-fired unit under the corresponding load comprises: Finding the minimum interval where the current dynamic load coefficient of the coal-based power unit is located through a pre-constructed lookup table; wherein, the lookup table stores a plurality of dynamic load correction coefficients corresponding to dynamic load coefficients of coal-based power units; Obtaining the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval through the lookup table; Based on the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval, calculating the dynamic load correction coefficient of the current coal-based power unit through interpolation.

4. The method for calculating the biomass power generation capacity coupled with coal-fired power generation according to claim 3, characterized in that, The biomass energy real-time power generation is based on In addition to the coal conveying and fuel preparation system and the heating system of the coal-based power unit, the real-time auxiliary power of the power plant is allocated by coupling energy with the biomass gas After calculating the biomass energy online power, the method further comprises: Obtaining the actual online power generation amount; Judging whether the difference between the calculated online power generation amount of biomass energy and the actual online power generation amount is less than a preset threshold value; If not, recalculate the online power generation amount by taking a value between the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval according to a preset step, and when the difference between the recalculated online power generation amount and the actual online power generation amount is less than the preset threshold value, store the corresponding dynamic load correction coefficient as the dynamic load correction coefficient corresponding to the current dynamic load coefficient of the coal-based power unit in the lookup table; or when there is no value between the dynamic load correction coefficients corresponding to the two endpoints of the minimum interval that makes the difference between the recalculated online power generation amount and the actual online power generation amount less than the preset threshold value, store the dynamic load correction coefficient corresponding to the minimum difference as the dynamic load correction coefficient corresponding to the current dynamic load coefficient of the coal-based power unit in the lookup table.

5. A biomass energy on-grid electricity quantity calculation system for coal-fired coupled biomass power generation, characterized in that, The system comprises: The first calculation module is used for calculating the low heat value of the biomass gas , the sensible heat of the biomass gas entering the furnace , and the condensate water heat absorption ; A second calculation module is configured to calculate the low-grade heat of the biomass gas based on the low-grade heat of the biomass gas, the sensible heat of the biomass gas entering the furnace, and the heat absorption of the condensate water ;​​​ The third calculation module is configured to calculate the standard coal consumption rate of the coal-fired power unit under the real-time converted pure condensing condition ; A fourth calculation module is configured to calculate the energy coupling of the biomass gas based on the biomass gas and the real-time conversion of the power generation standard coal consumption rate of the coal-fired power unit under the pure condensing condition Calculate the real-time power generation of biomass energy ; The fifth computing module is configured to calculate the real-time auxiliary power of the power plant except the coal conveying and fuel preparation system and the heating system of the coal-fired power unit relying on the biomass gas coupling energy allocation ; A sixth calculation module is configured to calculate the real-time power generation of the biomass energy based on the biomass energy real-time power generation and the real-time auxiliary power of the power plant except the coal conveying and fuel preparation system and the heating system of the coal-fired power unit coupled with the biomass gas Calculate the biomass energy online power The low heat value of the biomass gas , the biomass gas into the furnace sensible heat , and the condensate water heat absorption Calculate the biomass gas coupling energy It includes: The coupled energy of the biomass gas is calculated according to the following formula ; ； wherein, is the enthalpy of the condensate of the coal-based power unit, is the boiler efficiency of the coal-based power unit; ; wherein, is the specific enthalpy of the superheated steam at the outlet of the boiler, is the specific enthalpy of the extraction steam displaced by the condensate entering the heat exchanger; is the specific enthalpy of the exhaust steam at the rated back pressure condition of the coal-fired unit, is the specific entropy of the superheated steam at the outlet of the boiler, is the specific entropy of the extraction steam displaced by the condensate entering the heat exchanger, is the specific entropy of the exhaust steam at the rated back pressure condition of the coal-fired unit, is the average annual ambient temperature at the site. The calculation relies on real-time conversion of the coal-fired generating unit under the pure condensing condition of the standard coal consumption rate Comprising: Obtaining standard coal consumption rate of coal-fired power unit under rated load and pure condensing condition ; Computing dynamic load correction factors for coal-fired generating units at corresponding loads ; According to the standard coal consumption rate of the coal-based power unit under the rated load of the pure condensing condition And the dynamic load correction coefficient of the coal-based power unit under the corresponding load Calculate the standard coal consumption rate of the coal-based power unit under the real-time equivalent pure condensing condition ; The calculation is coupled with the biomass gas energy allocation of the coal-based power unit, and the real-time auxiliary power of the coal and fuel preparation system and the heating system is allocated Comprising: Acquiring real-time power generation of coal-fired power unit ; Calculating real-time auxiliary power of coal-fired power unit ; The biomass gas coupling energy is based on The real-time power generation of the coal-based power unit The real-time standard coal consumption rate of the coal-based power unit under the real-time converted pure condensing working condition The real-time auxiliary power of the coal-based power unit The real-time auxiliary power of the coal-based power unit except the coal conveying and fuel preparation system and the heating system is calculated according to the biomass gas coupling energy ; wherein, ； wherein, is the ratio of the power consumption of the coal conveying and fuel preparation system under the rated condition of the coal-fired power unit to the power consumption of the coal-fired power unit under the rated condition when the biomass gasification island is not in operation, is the ratio of the power consumption of the heating system under the rated condition of the coal-fired power unit to the power consumption of the coal-fired power unit under the rated condition when the biomass gasification island is not in operation. The biomass energy real-time power generation is based on In addition to the coal conveying and fuel preparation system and the heating system, the real-time auxiliary power of the coal-fired unit coupled with the biomass gas energy is allocated The biomass energy online power is calculated, including: Obtaining biomass gasification island real-time plant power ; The biomass energy on-grid power is calculated according to the following formula : ; Wherein, dt is the time differential.

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