Coal-fired power unit full-time carbon emission evaluation method and system based on boiler parameters

Abstract

The application discloses a coal-fired power unit full-time period carbon emission evaluation method and system based on a boiler parameter, and comprises the following steps: calculating instantaneous carbon emission according to instantaneous fuel consumption of a boiler and proportion of carbon element in fuel element analysis; calculating boiler output available energy according to boiler outlet parameters; calculating carbon emission intensity of unit available energy based on the calculated instantaneous carbon emission and the boiler output available energy; and taking the carbon emission intensity as an evaluation index to evaluate the full-time period carbon emission of the coal-fired power unit. The application introduces available energy (exergy) analysis into carbon emission evaluation, realizes comparability of carbon emission intensity of the unit in the heating season, the non-heating season and different steam extraction conditions, and provides an effective index for comprehensively comparing and evaluating carbon emission levels of the same coal-fired power unit in different periods.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal-fired power unit carbon emission calculation, and particularly relates to a coal-fired power unit full-time period carbon emission evaluation method and system based on boiler parameters. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] Good carbon emission accounting of coal-fired power units is of great significance to guiding unit carbon reduction and serving the carbon trading market.

[0004] At present, many coal-fired power units have the task of supplying steam in addition to power generation. Due to unstable user demand, the steam extraction amount of the unit is different at different times, resulting in a large difference in boiler evaporation capacity and carbon emission amount for the same power generation, thereby bringing difficulties for comparing and evaluating the carbon emission intensity of different units. SUMMARY

[0005] In order to solve the above problems, the present application provides a coal-fired power unit full-time period carbon emission evaluation method and system based on boiler parameters, which can calculate the carbon emission amount of unit available energy (exergy) in real time according to the boiler outlet parameters, the evaluation index is not affected by the heating season and non-heating season and the amount of steam extraction, and the comprehensive evaluation of the carbon emission level of different parameter units is realized.

[0006] In some embodiments, the following technical solutions are adopted:

[0007] A coal-fired power unit full-time period carbon emission evaluation method based on boiler parameters, comprising:

[0008] calculating the instantaneous carbon emission amount according to the instantaneous fuel consumption of the boiler and the proportion of carbon elements in the fuel element analysis;

[0009] calculating the boiler output available energy according to the boiler outlet parameters;

[0010] calculating the carbon emission intensity of unit available energy based on the calculated instantaneous carbon emission amount and the boiler output available energy;

[0011] using the carbon emission intensity as an evaluation index to evaluate the full-time period carbon emission of the coal-fired power unit.

[0012] As a further scheme, the instantaneous carbon emission amount is the product of the instantaneous fuel consumption of the boiler, the proportion of carbon elements in the fuel element analysis and a set constant.

[0013] As a further scheme, the boiler output available energy is the sum of the superheated steam available energy and the reheated steam available energy.

[0014] As a further solution, the superheated steam can be calculated based on superheated steam flow, low pressure cylinder exhaust enthalpy, low pressure cylinder exhaust temperature, low pressure cylinder exhaust entropy, superheated steam enthalpy value and superheated steam entropy.

[0015] As a further solution, the reheat steam can be calculated based on reheat steam flow, low pressure cylinder exhaust temperature, reheat inlet enthalpy, entropy and reheat outlet enthalpy, entropy.

[0016] As a further solution, the carbon emission intensity per unit of available energy is determined based on the ratio of instantaneous carbon emission and boiler outlet available energy.

[0017] In some other embodiments, the following technical solutions are adopted:

[0018] A coal-fired power unit full-time period carbon emission evaluation system based on boiler parameters, comprising:

[0019] An instantaneous carbon emission calculation module, configured to calculate instantaneous carbon emission based on instantaneous fuel consumption of the boiler and proportion of carbon element in fuel element analysis;

[0020] A boiler output available energy calculation module, configured to calculate boiler output available energy based on boiler outlet parameters;

[0021] A carbon emission intensity per unit of available energy calculation module, configured to calculate carbon emission intensity per unit of available energy based on the calculated instantaneous carbon emission and boiler output available energy;

[0022] A carbon emission evaluation module, configured to take the carbon emission intensity as an evaluation index to evaluate full-time period carbon emission of the coal-fired power unit.

[0023] In some other embodiments, the following technical solutions are adopted:

[0024] A terminal device comprising a processor and a memory, the processor being configured to implement various instructions; the memory being configured to store a plurality of instructions, the instructions being adapted to be loaded and executed by the processor to implement the above-mentioned coal-fired power unit full-time period carbon emission evaluation method based on boiler parameters.

[0025] In some other embodiments, the following technical solutions are adopted:

[0026] A computer readable storage medium, wherein a plurality of instructions are stored, the instructions being adapted to be loaded and executed by a processor of a terminal device to implement the above-mentioned coal-fired power unit full-time period carbon emission evaluation method based on boiler parameters.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] (1) The present application introduces exergy analysis into carbon emission evaluation, realizes the comparability of carbon emission intensity of the unit in the heating season, non-heating season and different extraction steam conditions, and provides an effective index for comprehensive comparison and evaluation of carbon emission level of the same coal-fired unit in different periods.

[0029] (2) The unit exergy carbon emission intensity calculation method provided by the present application takes into account the quantity and quality of energy, and provides a favorable reference for comparison and evaluation of carbon emission levels between units with different parameter levels.

[0030] (3) The present application uses the exergy at the outlet of the boiler as the denominator for calculating the carbon emission intensity of the unit, and proposes a comprehensive evaluation index in addition to power generation carbon emission and heating carbon emission.

[0031] Other features and advantages of the present application will be partially given in the following description, partially will become apparent from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The flow chart of the coal-fired unit full-period carbon emission evaluation method based on boiler parameters in the embodiments of the present application. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0034] It should be noted that the terms used herein are only for the purpose of describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of a feature, step, operation, device, component and / or combination thereof.

[0035] Embodiment one

[0036] In one or more embodiments, a coal-fired unit full-period carbon emission evaluation method based on boiler parameters is disclosed, which combines Figure 1 , and specifically includes the following processes:

[0037] Step (1): According to the instantaneous fuel consumption of the boiler and the proportion of carbon element in the fuel element analysis, the instantaneous carbon emission is calculated; specifically:

[0038] C z = B·c%·0.99*44 / 12 (1)

[0039] wherein C z is the instantaneous carbon emission of the unit, tCO2 / h; B is the instantaneous fuel consumption of the boiler, t / h; c% is the proportion of carbon element in the fuel element analysis, %.

[0040] Step (2): calculating the boiler output available energy according to the boiler outlet parameters; the boiler output available energy includes superheated steam available energy E gq and reheated steam available energy E zr .

[0041] wherein the calculation method of the superheated steam available energy E gq is:

[0042] E gq = D gq [(h gq -h b )-T b (s gq -s b )] (2)

[0043] the calculation method of the reheated steam available energy E zr is:

[0044] E zr = D zr [(h zrc -h zrr )-T b (s zrc -s zrr )] (3)

[0045] the calculation method of the boiler output available energy is specifically:

[0046] E g = E gq +E zr (4)

[0047] wherein E g is the boiler outlet available energy, kJ / kg; E gq is the superheated steam available energy, kJ / kg; E zr is the reheated steam available energy, kJ / kg; h gq is the superheated steam enthalpy, s gq is the superheated steam entropy;

[0048] D gq is the superheated steam flow, t / h; D zr is the reheated steam flow, t / h; T b , h b , s b are respectively the low-pressure cylinder exhaust steam temperature, enthalpy and entropy; h zrc , szrcr respectively, are the enthalpy and entropy of the reheater outlet; h zrr , s zrr respectively, are the enthalpy and entropy of the reheater inlet; h gq , s gq respectively, are the enthalpy and entropy of the reheated steam.

[0049] Step (3): based on the calculated instantaneous carbon emission and the available energy output by the boiler, the carbon emission intensity per unit of available energy is calculated; specifically:

[0050] C ky = 1000 * C z / E g (5)

[0051] wherein, C ky : carbon emission intensity per unit of available energy, kg / kJ.

[0052] Step (4): taking the carbon emission intensity as an evaluation index, the full-time period carbon emission of the coal-fired power generating unit is evaluated.

[0053] In addition to power generation, the power generating unit often also undertakes steam and heat supply work, which also has carbon emission. The amount of power supply, heat supply, and steam supply of the unit in different time periods is different, and the carbon emission intensity (tCO2 / MWh) of power generation and the carbon emission intensity (tCO2 / GJ) of heat and steam supply can only single reflect the carbon emission situation of the unit during power generation or heat supply in a time period (because the amount of heat and steam supply in different time periods is different and the carbon allocation method of power generation and heat supply is unreasonable, the carbon emission intensity of power generation in different time periods is not comparable, and it is unable to perform evaluation and comparison of the carbon emission level of the unit along the time axis. According to the boiler outlet parameters, the embodiment can calculate the carbon emission of the unit per unit of available energy (exergy) in real time, that is, the carbon dioxide emission per unit of available energy (exergy), and the evaluation index is not affected by the amount of heat supply in the heat supply season and the non-heat supply season and the amount of steam extraction. The influence of the different amounts of power generation, heat supply, and steam supply in different time periods is eliminated, the boiler outlet steam available energy is taken as the denominator, so that the evaluation and comparison of the carbon emission level of the unit in the full-time period can be realized, and the comprehensive evaluation of the carbon emission level of the unit with different parameters can be realized.

[0054] Embodiment Two

[0055] In one or more embodiments, a coal-fired power generating unit full-time period carbon emission evaluation system based on boiler parameters is disclosed, comprising:

[0056] An instantaneous carbon emission amount calculation module is configured to calculate the instantaneous carbon emission amount according to the instantaneous fuel consumption amount of the boiler and the proportion of the carbon element in the fuel element analysis;

[0057] A boiler output available energy calculation module is configured to calculate the available energy output by the boiler according to the boiler outlet parameters;

[0058] a carbon emission intensity per unit available energy calculation module, configured to calculate the carbon emission intensity per unit available energy based on the calculated instantaneous carbon emission and the available energy of the boiler output;

[0059] a carbon emission evaluation module, configured to evaluate the carbon emission of the coal-fired power generating unit in the whole time period by taking the carbon emission intensity as an evaluation index.

[0060] It should be noted that the specific implementation of each module has been described in Embodiment One, which will not be described in detail here.

[0061] Embodiment Three

[0062] In one or more embodiments, a terminal device is disclosed, which comprises a server, the server comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method for evaluating the carbon emission of the coal-fired power generating unit in the whole time period based on the boiler parameters in Embodiment One when executing the program. For brevity, it will not be described here.

[0063] It should be understood that in the embodiments, the processor can be a central processing unit (CPU), and the processor can also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), ready-to-program gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0064] The memory can include read-only memory and random access memory, and provide instructions and data to the processor, and a portion of the memory can also include non-volatile random access memory. For example, the memory can also store device type information.

[0065] In the implementation process, each step of the above method can be completed by the integrated logic circuit of hardware in the processor or the instruction in the form of software.

[0066] Embodiment Four

[0067] In one or more embodiments, a computer readable storage medium is disclosed, wherein a plurality of instructions are stored, the instructions being suitable for being loaded and executed by the processor of the terminal device to implement the method for evaluating the carbon emission of the coal-fired power generating unit in the whole time period based on the boiler parameters in Embodiment One.

[0068] The above describes the specific embodiments of the present application in combination with the accompanying drawings, but is not a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A method for evaluating the carbon emissions of coal-fired power units throughout the entire time period based on boiler parameters, characterized in that, include: The instantaneous carbon emissions are calculated based on the boiler's instantaneous fuel consumption and the proportion of carbon in the fuel element analysis. Calculate the available energy output of the boiler based on the boiler outlet parameters; Boiler output available energy includes superheated steam available energy. E gq and reheat steam available energy E zr ; The specific method for calculating the usable energy output of the boiler is as follows: in, E g Available energy at boiler outlet, kJ / kg; E gq The usable energy of superheated steam is kJ / kg; E zr The usable energy for reheated steam is kJ / kg; Based on the calculated instantaneous carbon emissions and the available energy output from the boiler, the carbon emission intensity per unit of available energy is calculated. The carbon emission intensity is used as an evaluation index to evaluate the carbon emissions of coal-fired power units throughout the entire time period.

2. The method for evaluating the carbon emissions of coal-fired power units throughout the entire time period based on boiler parameters as described in claim 1, characterized in that, The instantaneous carbon emissions are the product of the boiler's instantaneous fuel consumption, the proportion of carbon in the fuel element analysis, and a set constant.

3. The method for evaluating the carbon emissions of coal-fired power units throughout the entire time period based on boiler parameters as described in claim 1, characterized in that, The boiler output available energy is the sum of superheated steam available energy and reheated steam available energy.

4. The method for evaluating the carbon emissions of coal-fired power units throughout the entire time period based on boiler parameters as described in claim 3, characterized in that, The superheated steam can be calculated based on the superheated steam flow rate, low-pressure cylinder exhaust enthalpy, low-pressure cylinder exhaust temperature, low-pressure cylinder exhaust entropy, superheated steam enthalpy value, and superheated steam entropy.

5. The method for evaluating the carbon emissions of coal-fired power units throughout the entire time period based on boiler parameters as described in claim 3, characterized in that, The reheat steam can be calculated based on the reheat steam flow rate, low-pressure cylinder exhaust temperature, reheater inlet enthalpy and entropy, and reheater outlet enthalpy and entropy.

6. The method for evaluating the carbon emissions of coal-fired power units throughout the entire time period based on boiler parameters as described in claim 1, characterized in that, The carbon emission intensity per unit of available energy is determined based on the ratio of instantaneous carbon emissions to the available energy at the boiler outlet.

7. A full-time carbon emission assessment system for coal-fired power units based on boiler parameters, characterized in that, include: The instantaneous carbon emission calculation module is used to calculate the instantaneous carbon emission based on the boiler's instantaneous fuel consumption and the proportion of carbon in the fuel element analysis. The boiler output available energy calculation module is used to calculate the boiler output available energy based on the boiler outlet parameters; Boiler output available energy includes superheated steam available energy. E gq and reheat steam available energy E zr ; The specific method for calculating the usable energy output of the boiler is as follows: in, E g Available energy at boiler outlet, kJ / kg; E gq The usable energy of superheated steam is kJ / kg; E zr The usable energy for reheated steam is kJ / kg; The carbon emission intensity per unit of available energy calculation module is used to calculate the carbon emission intensity per unit of available energy based on the calculated instantaneous carbon emissions and the available energy output of the boiler. The carbon emission assessment module is used to evaluate the carbon emission intensity as an assessment indicator for the carbon emissions of coal-fired power units throughout the entire time period.

8. The all-time carbon emission assessment system for coal-fired power units based on boiler parameters as described in claim 7, characterized in that, The instantaneous carbon emissions are the product of the boiler's instantaneous fuel consumption, the proportion of carbon in the fuel element analysis, and a set constant.

9. The all-time carbon emission assessment system for coal-fired power units based on boiler parameters as described in claim 7, characterized in that, The boiler output available energy is the sum of superheated steam available energy and reheated steam available energy.

10. The all-time carbon emission assessment system for coal-fired power units based on boiler parameters as described in claim 7, characterized in that, The superheated steam can be calculated based on the superheated steam flow rate, low-pressure cylinder exhaust enthalpy, low-pressure cylinder exhaust temperature, low-pressure cylinder exhaust entropy, superheated steam enthalpy value, and superheated steam entropy.

11. The all-time carbon emission assessment system for coal-fired power units based on boiler parameters as described in claim 7, characterized in that, The reheat steam can be calculated based on the reheat steam flow rate, low-pressure cylinder exhaust temperature, reheater inlet enthalpy and entropy, and reheater outlet enthalpy and entropy.

12. The all-time carbon emission assessment system for coal-fired power units based on boiler parameters as described in claim 7, characterized in that, The carbon emission intensity per unit of available energy is determined based on the ratio of instantaneous carbon emissions to the available energy at the boiler outlet.

13. A terminal device comprising a processor and a memory, the processor for implementing instructions; the memory for storing multiple instructions, characterized in that, The instructions are adapted to be loaded by a processor and executed as described in any one of claims 1-6, which is the method for evaluating the carbon emissions of coal-fired power units throughout the entire time period based on boiler parameters.

14. A computer-readable storage medium storing a plurality of instructions, characterized in that, The instructions are adapted to be loaded and executed by the processor of the terminal device, and are based on the method for evaluating the carbon emissions of coal-fired power units throughout the time period according to any one of claims 1-6.

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