CN112507534A - Conversion method and system for power supply coal consumption rate of cogeneration unit in heat supply period - Google Patents
Conversion method and system for power supply coal consumption rate of cogeneration unit in heat supply period Download PDFInfo
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Abstract
The invention discloses a conversion method and a system for power supply coal consumption rate of a cogeneration unit in a heating period, wherein the conversion method comprises the following steps: acquiring real-time operation data of a cogeneration unit; respectively calculating to obtain the fire value of heating extraction steam at the exhaust steam temperature and the fire value of industrial extraction steam at the exhaust steam temperature; calculating available heat of heating extraction steam, available heat of industrial extraction steam and total available heat; calculating the total available heat if used to generate an electrical load that can be generated; and calculating the converted power supply coal consumption rate based on the power load and the power supply coal consumption rate calculated by the conventional method. The invention can convert the heat supplied by the unit into the electricity generated based on the theory of the efficiency of fire, thus the unit is equivalent to the unit running in the pure condensing state, the coal consumption rate of power supply can be directly compared among the units running in the pure condensing state, the problem that the coal consumption cannot be compared due to different heat supply amount of the unit is solved, and the direct comparison of the coal consumption among the heat supply units is realized.
Description
Technical Field
The invention relates to the technical field of heat supply of a cogeneration unit, in particular to a conversion method and a conversion system for the power supply coal consumption rate of the cogeneration unit in the heat supply period.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, heat supply of a thermal power generating unit becomes a mainstream trend, in the heat supply unit, part of units supply heat in winter, and other parts of units simultaneously carry industrial steam extraction, and the industrial steam extraction is supplied all the year round and cannot be interrupted; the influence of external heat supply on the coal consumption of the unit is difficult to calculate due to the fact that unit operation parameters, heat supply steam extraction parameters, the number of heat users and the like are different among different units.
In the prior art, the coal consumption rate of the cogeneration unit is determined by the following two methods:
(1) distinguishing a non-heat supply period and a heat supply period, and respectively verifying the coal consumption rate;
(2) directly counting the coal consumption rate without considering the heat supply state of the unit;
the method has the problems that the influence of the heat supply load on the coal consumption rate of the unit cannot be measured, the coal consumption rate of the unit under the same load is greatly different due to the difference of the heat supply load between the units and in different time periods of the unit, and the coal consumption rate of the cogeneration unit under the heat supply state cannot accurately reflect the real energy consumption level of the unit.
Disclosure of Invention
In order to solve the problems, the invention provides a conversion method and a conversion system for the power supply coal consumption rate of a cogeneration unit in the heating period, which are based on
The idea of efficiency is to use the heat supplied by the unit (including heating steam extraction and industrial steam extraction) according to
The efficiency calculation method calculates the available part, then converts the available part into the electric load, and calculates the converted power supply coal consumption rate.
In some embodiments, the following technical scheme is adopted:
a conversion method for the power supply coal consumption rate of a cogeneration unit in the heating period comprises the following steps:
acquiring real-time operation data of a cogeneration unit;
respectively calculating to obtain the heating extraction steam at the exhaust steam temperature
Value and industrial extraction at exhaust temperature
A value;
calculating available heat of heating extraction steam, available heat of industrial extraction steam and total available heat;
calculating the total available heat if used to generate an electrical load that can be generated;
and calculating the converted power supply coal consumption rate based on the power load and the power supply coal consumption rate calculated by the conventional method.
In other embodiments, the following technical solutions are adopted:
a coal consumption conversion system for power supply of a cogeneration unit in a heating period comprises:
means for obtaining real-time operating data of a cogeneration unit;
used for respectively calculating the exhaust steam temperature of heating extraction steam
Value and industrial extraction at exhaust temperature
A means of value;
means for calculating the available heat of the heating extraction, the available heat of the industrial extraction and the total available heat;
means for calculating the total available heat if used to generate an electrical load capable of generating electricity;
and the device is used for calculating the converted power supply coal consumption rate based on the power load and the power supply coal consumption rate calculated by adopting a 'benefit return' method.
In other embodiments, the following technical solutions are adopted:
a terminal device comprising a processor and a computer-readable storage medium, the processor being configured to implement instructions; the computer readable storage medium is used for storing a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the power supply coal consumption rate conversion method of the cogeneration unit in the heating period.
In other embodiments, the following technical solutions are adopted:
a computer readable storage medium having stored therein a plurality of instructions adapted to be loaded by a processor of a terminal device and to execute the above-mentioned method for converting a coal consumption rate of a power supply during a heating period of a cogeneration unit.
Compared with the prior art, the invention has the beneficial effects that:
(1) under different heat supply parameters (pressure, temperature and flow), even if the electric loads are the same, the unit actually works in different states, the energy utilization efficiency of the unit is different, and the calculated coal consumption rate of the unit for power supply is also different. The inventionBased on
According to the efficiency theory, the heat supplied by the units can be converted into the electricity generated, so that the units operate in a pure condensing state, the coal consumption rate of power supply can be directly compared among the units operating in the pure condensing state, the problem that the coal consumption cannot be compared due to different heat supply amounts of the units is solved, and the direct comparison of the coal consumption among the heat supply units is realized.
Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a cogeneration unit thermodynamic system;
fig. 2 is a schematic diagram of a conversion method of power supply coal consumption rate of a cogeneration unit in a heating period in the embodiment of the invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, a conversion method for power supply coal consumption rate of cogeneration unit in heating period is disclosed, which is based on
The idea of efficiency is to use the heat supplied by the unit (including heating steam extraction and industrial steam extraction) according to
The efficiency calculation method calculates the available part, then converts the available part into the electric load, and calculates the converted power supply coal consumption rate.
Fig. 1 shows a schematic diagram of a thermodynamic system of a cogeneration unit in a heat supply period in this embodiment, where external steam supply 1 and external steam supply 2 respectively represent heating steam extraction and industrial steam extraction, steam extraction positions thereof may be selected in multiple ways and are not fixed, two steam extractions may exist independently or jointly, and during specific calculation, conversion calculation may be performed as long as three parameters, i.e., steam extraction pressure, temperature, and flow, exist.
Referring to fig. 2, the method of this embodiment includes the following specific processes:
(1) and acquiring real-time operation data of the unit. The system mainly comprises the active power of a generator, the power plant consumption rate, the main steam pressure, the main steam temperature, the reheat steam pressure, the reheat steam temperature, the cold reheat steam pressure, the cold reheat steam temperature, the water supply temperature, the coal quality data of entering a furnace, the carbon content of ash, the smoke exhaust temperature, the smoke exhaust oxygen amount, the heating steam extraction flow, the heating steam extraction pressure, the heating steam extraction temperature, the industrial steam extraction flow, the industrial steam extraction pressure, the industrial steam extraction temperature and the like;
(2) according to the existing regulations and standard computer unit power supply coal consumption rate, at the moment, a default benefit return algorithm in the industry is adopted to deduct heat supply heat from total heat;
the method for calculating the coal consumption rate of the 'benefit return to electricity' power supply is a general method disclosed in the industry, and the calculation formula is as follows:
wherein: bgdFor power coal consumption rate, g/kWh; hRHeat consumption of a steam turbine, kJ/kWh; h isblBoiler efficiency,%; h isgdFor pipeline efficiency%；
Is the power consumption rate of the plant,%.
(3) Inquiring water and steam property calculation software, and respectively inquiring main steam enthalpy, reheating steam enthalpy, exhaust steam enthalpy, heating extraction steam enthalpy, industrial extraction steam enthalpy, heating extraction steam entropy, industrial extraction steam entropy and exhaust steam entropy;
(4) calculating to obtain exhaust steam
Heating steam extraction
Value, industrial extraction of steam
The value is calculated to obtain the heating extraction steam at the exhaust steam temperature
Value and industrial extraction at exhaust temperature
A value;
(5) calculating available heat of heating extraction steam, available heat of industrial extraction steam and total available heat;
(6) calculating the total available heat if used to generate an electrical load that can be generated;
(7) and (4) calculating the converted power supply coal consumption rate according to the calculation result of the step (1) and the step (6).
The step (4) calculates T0.cAt temperature of
The formula for the value is:
e＝h-T0.cs
calculating the exhaust temperature of heating steam
The formula for the value is:
eT0＝e-e0-(T0-T0.c)(s-s0)
in which e is relative to T0.cCalculated
A value; e.g. of the type0Is T0Relative to T at temperature0.cCalculated
A value; h is the enthalpy value of heating extraction steam; t is0.cThe triple point temperature of water, with a value equal to 273.16K; t is0Is ambient temperature; s is the heating steam extraction relative to T0.cA calculated entropy value; s0Is T0Relative to T at temperature0.cA calculated entropy value.
At exhaust temperature
Value and heating extraction steam at exhaust steam temperature
The value calculation methods are the same, and the difference is that the steam extraction parameters (temperature, pressure and flow) are different.
Calculating the available heat of heating extraction steam and the available heat of industrial extraction steam in the step (5), and specifically comprising the following steps:
Qcn＝eT0×Gcn
Qgy＝e′T0×Ggy
wherein Q iscnIs T0Available heat for heating and steam extraction at temperature; gcnThe flow rate of heating steam extraction; qgyIs T0Available heat for industrial steam extraction at temperature; ggyThe flow rate of industrial extraction steam; e.g. of the typeT0For heating with extraction of steam at exhaust temperature
Value, e'T0At exhaust temperature for industrial extraction
The value is obtained.
The step (6) of calculating the total available heat if used for generating the electrical load which can be generated specifically comprises the following steps:
Qgeneral assembly＝Qcn+Qgy
In the formula, Δ P is T0An electrical load to which heat available at temperature can be converted; eta is the generator efficiency; qGeneral assemblyIs the sum of the total available heat, i.e. the available heat for heating extraction and the available heat for industrial extraction.
The formula for calculating the converted power supply coal consumption rate in the step (7) is as follows:
in the formula, bzsConverting the power supply coal consumption rate into a pure condensing state; bgdThe power supply coal consumption rate is calculated by a 'benefit return to power' method; p is the power of the generator; qfdThe heat consumption for power generation; qgrFor the heat consumption of the heat supply.
B used in the calculationgd、Qfd、QgrThe calculation method of the equal parameters is a general calculation method in the industry, and is not described in detail herein.
Example two
In one or more embodiments, a cogeneration unit supply period power coal consumption conversion system is disclosed, comprising:
means for obtaining real-time operating data of a cogeneration unit;
used for respectively calculating the exhaust steam temperature of heating extraction steam
Value and industrial extraction at exhaust temperature
A means of value;
means for calculating the available heat of the heating extraction, the available heat of the industrial extraction and the total available heat;
means for calculating the total available heat if used to generate an electrical load capable of generating electricity;
and the device is used for calculating the converted power supply coal consumption rate based on the power load and the power supply coal consumption rate calculated by adopting a 'benefit return' method.
It should be noted that the specific implementation process of the apparatus is implemented in the manner disclosed in the first embodiment, and details are not described again.
EXAMPLE III
In one or more implementations, a terminal device is disclosed that includes a server including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the method of the first embodiment when executing the program. For brevity, no further description is provided herein.
It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate arrays FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may include both read-only memory and random access memory, and may provide instructions and data to the processor, and a portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information.
In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software.
The method in the first embodiment may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, among other storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.
Example four
In one or more embodiments, a computer-readable storage medium is disclosed, having stored thereon a plurality of instructions adapted to be loaded by a processor of a terminal device and implementing the method for converting a power supply coal consumption rate of a cogeneration unit during a heating period as described in the first embodiment.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A conversion method for the power supply coal consumption rate of a cogeneration unit in the heating period is characterized by comprising the following steps:
acquiring real-time operation data of a cogeneration unit;
respectively calculating to obtain the heating extraction steam at the exhaust steam temperature
Value and industrial extraction at exhaust temperature
A value;
calculating available heat of heating extraction steam, available heat of industrial extraction steam and total available heat;
calculating the total available heat if used to generate an electrical load that can be generated;
and calculating the converted power supply coal consumption rate based on the power load and the power supply coal consumption rate calculated by the conventional method.
2. The method for converting the coal consumption rate of the cogeneration unit during the heating period as claimed in claim 1, wherein the obtaining of the real-time operation data of the cogeneration unit comprises: the system comprises a generator active power, a plant power consumption rate, a main steam pressure, a main steam temperature, a reheat steam pressure, a reheat steam temperature, a cold reheat steam pressure, a cold reheat steam temperature, a water supply temperature, coal quality data entering a furnace, ash carbon content, smoke exhaust temperature, smoke exhaust oxygen amount, heating steam extraction flow, heating steam extraction pressure, heating steam extraction temperature, industrial steam extraction flow, industrial steam extraction pressure and industrial steam extraction temperature.
3. The method for converting the coal consumption rate of power supply of the cogeneration unit in the heating period as claimed in claim 1, wherein the calculation of the heating extraction steam is performed at the exhaust steam temperature
The values are specifically:
eT0＝e-e0-(T0-T0.c)(s-s0)
wherein e is T0.cCalculated at temperature
A value; e.g. of the type0Is T0Relative to T at temperature0.cCalculated
A value; h is the enthalpy value of heating extraction steam; t is0.cIs the triple point temperature of water; t is0Is ambient temperature; s is the heating steam extraction relative to T0.cA calculated entropy value; s0Is T0Relative to T at temperature0.cA calculated entropy value.
4. The method for converting the coal consumption rate of power supply in the heating period of the cogeneration unit as claimed in claim 3, wherein T is0.cCalculated at temperature
The value e is specifically:
e＝h-T0.cs。
5. the method for converting the coal consumption rate of power supply in the heating period of the cogeneration unit as claimed in claim 1, wherein the calculating of the available heat of heating extraction and the available heat of industrial extraction specifically comprises:
Qcn＝eT0×Gcn
Qgy＝e′T0×Ggy
wherein Q iscnIs T0Available heat for heating and steam extraction at temperature; gcnThe flow rate of heating steam extraction; qgyIs T0Available heat for industrial steam extraction at temperature; ggyThe flow rate of industrial extraction steam; e.g. of the typeT0For heating with extraction of steam at exhaust temperature
Value, e'T0At exhaust temperature for industrial extraction
The value is obtained.
6. The method for converting the coal consumption rate of the power supply of the cogeneration unit in the heating period as claimed in claim 1, wherein the step of calculating the electric load which can be generated if the total available heat is used for generating electricity comprises the following specific steps:
Qgeneral assembly＝Qcn+Qgy
In the formula, Δ P is T0An electrical load to which heat available at temperature can be converted; eta is the generator efficiency; qGeneral assemblyIs the sum of the total available heat, i.e. the available heat for heating extraction and the available heat for industrial extraction.
7. The method for converting the coal consumption rate of power supply in the heating period of the cogeneration unit as claimed in claim 1, wherein the method for converting the coal consumption rate of power supply after conversion is to calculate the coal consumption rate of power supply after conversion, specifically:
wherein, bzsConverting the power supply coal consumption rate into a pure condensing state; bgdThe power supply coal consumption rate is calculated by adopting the existing benefit return method; p is the power of the generator; qfdThe heat consumption for power generation; qgrFor the heat consumption of the heat supply.
8. A coal consumption conversion system for power supply of a cogeneration unit in a heating period is characterized by comprising:
means for obtaining real-time operating data of a cogeneration unit;
used for respectively calculating the exhaust steam temperature of heating extraction steam
Value and industrial extraction at exhaust temperature
A means of value;
means for calculating the available heat of the heating extraction, the available heat of the industrial extraction and the total available heat;
means for calculating the total available heat if used to generate an electrical load capable of generating electricity;
and the device is used for calculating the converted power supply coal consumption rate based on the power load and the power supply coal consumption rate calculated by adopting a 'benefit return' method.
9. A terminal device comprising a processor and a computer-readable storage medium, the processor being configured to implement instructions; the computer readable storage medium is used for storing a plurality of instructions, wherein the instructions are adapted to be loaded by a processor and to execute the method for converting the coal consumption rate of the heating period of the cogeneration unit according to any one of claims 1 to 7.
10. A computer-readable storage medium having stored thereon a plurality of instructions, wherein the instructions are adapted to be loaded by a processor of a terminal device and to perform the method for converting a supply coal consumption rate of a heating period of a cogeneration unit according to any one of claims 1 to 7.
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| CN113434804A (en) * | 2021-06-23 | 2021-09-24 | 天津华能杨柳青热电有限责任公司 | Heat supply coal consumption calculation method based on unchanged power generation coal consumption |
| CN113807196A (en) * | 2021-08-24 | 2021-12-17 | 华能国际电力股份有限公司德州电厂 | Method for obtaining thermoelectric coupling characteristics of cogeneration unit |
| CN114562718A (en) * | 2022-01-26 | 2022-05-31 | 西安热工研究院有限公司 | Optimal control method and device for cogeneration unit and storage medium |
| CN114562718B (en) * | 2022-01-26 | 2023-09-01 | 西安热工研究院有限公司 | Optimal control method and device for cogeneration unit and storage medium |
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