CN113312794A - Energy-saving potential evaluation method, system, equipment and storage medium suitable for positive-pressure concentrated-phase pneumatic ash conveying system of coal-fired power plant - Google Patents
Energy-saving potential evaluation method, system, equipment and storage medium suitable for positive-pressure concentrated-phase pneumatic ash conveying system of coal-fired power plant Download PDFInfo
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Abstract
The invention discloses an energy-saving potential evaluation method, system, equipment and storage medium suitable for a positive pressure concentrated phase pneumatic ash conveying system of a coal-fired power plant, which comprises the following steps: obtaining the optimal ash falling time working condition and the total fly ash amount model of the boiler of each ash conveying unit under different load working conditions through an ash conveying system characteristic test; establishing a minimum ash conveying air compressor operation number model based on the optimal ash falling time working condition of the ash conveying unit and a boiler total fly ash quantity model; the actual furnace coal entering parameters of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant are led into the model with the minimum number of running ash conveying air compressors to obtain the minimum number of running ash conveying air compressors; the energy-saving potential of the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant can be evaluated according to the minimum number of running ash conveying air compressors, and the method, the system, the equipment and the storage medium can accurately evaluate the energy-saving potential of the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant.
Description
Technical Field
The invention belongs to the technical field of operation of an ash conveying system of a coal-fired power plant, and relates to an energy-saving potential evaluation method, system, equipment and storage medium suitable for a positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant.
Background
The flue gas generated by the boiler combustion of the coal-fired power plant contains a large amount of fly ash, is conveyed to an ash warehouse by a positive pressure dense-phase pneumatic ash conveying system at the lower part of the flue gas after being captured and collected in a dust removal system and then is conveyed to the outside of a plant by an automobile, an ash conveying system conveying air source is provided by an ash conveying air compressor, and the energy consumption of the ash conveying system is the plant power consumption rate of the ash conveying air compressor.
The existing energy consumption evaluation method of the ash conveying system only transversely compares the plant power consumption rate of the ash conveying air compressor with other power plants, and does not consider the influence of coal quality of fire coal, so that the energy consumption evaluation basis of the ash conveying system is disordered, and the difference between the minimum energy consumption (target value) which can be achieved under the condition that the ash conveying system and the coal quality of the common coal used for combustion of the unit are scientifically and accurately evaluated, namely the energy-saving potential of the ash conveying system cannot be evaluated.
Therefore, the method for evaluating the energy-saving potential of the ash conveying air compressor only according to the transverse comparison result of the plant power rates of the ash conveying air compressors of different units has limitations. A new evaluation method needs to be provided, aiming at the capacity of the unit to be evaluated and the coal quality of the coal, the actual plant power consumption rate of the ash conveying air compressor is compared with a target value, the energy consumption level of the ash conveying air compressor is evaluated, and the energy-saving potential of the ash conveying system is obtained.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method, a system, equipment and a storage medium for evaluating the energy-saving potential of a positive-pressure concentrated-phase pneumatic ash conveying system of a coal-fired power plant.
In order to achieve the purpose, the energy-saving potential evaluation method suitable for the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant comprises the following steps:
obtaining the optimal ash falling time working condition and the total fly ash amount model of the boiler of each ash conveying unit under different load working conditions through an ash conveying system characteristic test;
establishing a minimum ash conveying air compressor operation number model based on the optimal ash falling time working condition of the ash conveying unit and a boiler total fly ash quantity model;
the actual furnace coal entering parameters of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant are led into the model with the minimum number of running ash conveying air compressors to obtain the minimum number of running ash conveying air compressors;
and evaluating the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant according to the minimum number of running ash conveying air compressors.
In the step 1), through an ash conveying system characteristic test, the optimal ash falling time working condition of each ash conveying unit and a total fly ash amount model of the boiler under the rated load of the units of 100%, 90%, 80%, 70%, 60%, 50% and 40% are obtained.
Recording the coal feeding amount of the boiler, the total fly ash amount of the boiler and the loading operation number of the ash conveying air compressors under each load working condition, and drawing a curve of the minimum number of the ash conveying air compressors under different fly ash amounts.
And obtaining the minimum number of running ash conveying air compressors in the period of time by an interpolation method based on the curve of the minimum number of running ash conveying air compressors according to the actual fired coal parameters of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant.
And comparing the number of the current ash conveying air compressors with the minimum number of the calculated ash conveying air compressors to evaluate the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant.
An energy-saving potential evaluation system suitable for a positive-pressure concentrated-phase pneumatic ash conveying system of a coal-fired power plant comprises:
the test module is used for obtaining the optimal ash falling time working condition of each ash conveying unit and a total fly ash amount model of the boiler under different load working conditions through an ash conveying system characteristic test;
the building module is used for building a model with the least number of running ash conveying air compressors based on the optimal ash falling time working condition of the ash conveying unit and a total fly ash amount model of the boiler;
the calculation module is used for guiding actual as-fired coal parameters of the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant into the model with the minimum number of running ash conveying air compressors so as to obtain the minimum number of running ash conveying air compressors;
and the evaluation module is used for evaluating the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant according to the minimum number of the ash conveying air compressors.
A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the energy saving potential evaluation method suitable for the positive pressure dense phase pneumatic ash conveying system of the coal-fired power plant when executing the computer program.
A computer-readable storage medium, storing a computer program which, when executed by a processor, implements the steps of the energy saving potential assessment method applicable to a positive pressure dense phase pneumatic ash conveying system of a coal-fired power plant.
The invention has the following beneficial effects:
according to the energy-saving potential evaluation method, system, equipment and storage medium applicable to the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant, when the concrete operation is carried out, the least ash conveying air compressor running number model is constructed through test data obtained through the ash conveying system characteristic test, then the energy-saving potential of the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant is evaluated according to the least ash conveying air compressor running number obtained through the least ash conveying air compressor running number model, the interference of the unit running load and the coal quality of coal on the calculation of the energy-saving potential of the ash conveying system is eliminated, and the evaluation accuracy is high.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a graph showing the minimum number of running ash-conveying air compressors in the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Example one
The energy-saving potential evaluation method applicable to the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant comprises the following steps of:
1) obtaining the optimal ash falling time working condition and the total fly ash amount model of the boiler of each ash conveying unit under different load working conditions through an ash conveying system characteristic test;
2) establishing a minimum ash conveying air compressor operation number model based on the optimal ash falling time working condition of the ash conveying unit and a boiler total fly ash quantity model;
3) the actual furnace coal entering parameters of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant are led into the model with the minimum number of running ash conveying air compressors to obtain the minimum number of running ash conveying air compressors;
4) evaluating the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant according to the minimum number of running ash conveying air compressors obtained in the step 3).
In the step 1), an ash conveying system characteristic test is carried out to obtain the optimal ash falling time working condition of each ash conveying unit and a boiler total fly ash amount model under the rated load of units of 100%, 90%, 80%, 70%, 60%, 50% and 40%, wherein in the obtaining process, the ash falling time of each ash conveying unit is gradually increased, so that the system can reach the maximum ash falling time working condition of sustainable operation on the premise of no ash blockage and safe operation. And simultaneously recording the coal feeding amount of the boiler, the total fly ash amount of the boiler and the loading operation number of the ash conveying air compressors under each load working condition, drawing a curve of the minimum number of the operation numbers of the ash conveying air compressors under different fly ash amounts, and then obtaining the minimum number of the operation numbers of the ash conveying air compressors in the period of time by an interpolation method according to the curve of the minimum number of the operation numbers of the ash conveying air compressors.
And comparing the number of the current ash conveying air compressors with the minimum number of the calculated ash conveying air compressors to evaluate the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant.
Example two
As shown in fig. 1, for a coal-fired power generating unit, taking four ash conveying units and an ash conveying system equipped with four air compressors as an example, the concrete process is as follows:
1) establishing boiler fly ash quantity model
In the test coal quality (three common coal types, the received base ash content is A respectively)ar1、Aar2、Aar3And A isar1<Aar2<Aar3) The content of the fly ash is 100 percent through the characteristic test of an ash conveying systemAnd the ash falling time of each ash conveying unit is gradually increased under the rated load of 90%, 80%, 70%, 60%, 50% and 40% of the units, so that the system can reach the maximum ash falling time working condition of sustainable operation on the premise of no ash blockage and safe operation.
The coal feeding amount (unit is t/h) of the boiler under seven load working conditions is (subscripts 1, 2 and 3 represent three common coal types, and the base ash content is A respectivelyar1、Aar2、Aar3)：
G1＝[G100 G90 G80 G70 G60 G50 G40]1
G2＝[G100 G90 G80 G70 G60 G50 G40]2
G3＝[G100 G90 G80 G70 G60 G50 G40]2
The total fly ash amount of the boiler under different coal quality and load working conditions is (subscripts 1, 2 and 3 represent three common coal types, and the received base ash content is A respectivelyar1、Aar2、Aar3)：
A1＝Aar1G1＝[A100 A90 A80 A70 A60 A50 A40]1
A2＝Aar2G2＝[A100 A90 A80 A70 A60 A50 A40]2
A3＝Aar3G3＝[A100 A90 A80 A70 A60 A50 A40]3
2) Model for establishing least ash conveying air compressor running number
In the characteristic test of the ash conveying system, the loading operation number of the ash conveying air compressor under each stable working condition is recorded (subscripts 1, 2 and 3 represent three common coal types, and the base ash content is A respectivelyar1、Aar2、Aar3)：
Nopt1＝[N100 N90 N80 N70 N60 N50 N40]1
Nopt2＝[N100 N90 N80 N70 N60 N50 N40]2
Nopt3＝[N100 N90 N80 N70 N60 N50 N40]3
Under single operating mode, the condition that the operation is switched in the loading and unloading of part of air compressors can appear, and the number of the air compressors operating at the moment is as follows:
wherein N isLoadingThe number of the air compressors in the loading operation state continuously, k is the number of the air compressors with the loading and unloading switching operation, tLoadingFor loading the air compressor with operating time, ttotalThe duration of the operating condition.
Obtaining curves of the minimum number of running ash-conveying air compressors under the conditions of different fly ash amounts (subscripts 1, 2 and 3 represent three common coal types, and the base ash content is A respectivelyar1、Aar2、Aar3) Referring to fig. 2:
Nopt1＝f(G1)
Nopt2＝f(G2)
Nopt3＝f(G3)
3) introduction of actual coal as fired parameters
Taking the process that a certain unit ash conveying system operates for a period of time as an evaluation object, and importing corresponding parameters of coal as fired as shown in tables 1 and 2:
TABLE 1
TABLE 2
4) Accounting for minimum number of running ash-conveying air compressor in actual running process
According to the curve of the minimum number of running ash-conveying air compressors obtained in the step 2), so as to
Based on the operation number N of the least ash conveying air compressors in the period of time obtained by an interpolation methodoptThe method specifically comprises the following steps:
within the period of time
At Aar1And Aar2For example, there are:
to obtain NoptComprises the following steps:
5) accounting for energy-saving potential of ash conveying system
The actual power consumption of the ash conveying air compressor in the period of time is counted to be WPractice ofGenerating capacity of the unit is PPower generationThe running power of a single ash conveying air compressor is PAsh conveying air compressorThe energy-saving potential of the ash conveying system in the period is as follows:
namely, compared with the power consumption rate corresponding to the minimum number of running ash conveying air compressors of the ash conveying system, the power consumption rate of the current ash conveying system of the unit can be reduced by optimizing the running.
EXAMPLE III
The invention relates to an energy-saving potential evaluation system suitable for a positive pressure concentrated phase pneumatic ash conveying system of a coal-fired power plant, which comprises:
the test module is used for obtaining the optimal ash falling time working condition of each ash conveying unit and a total fly ash amount model of the boiler under different load working conditions through an ash conveying system characteristic test;
the building module is used for building a model with the least number of running ash conveying air compressors based on the optimal ash falling time working condition of the ash conveying unit and a total fly ash amount model of the boiler;
the calculation module is used for guiding actual as-fired coal parameters of the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant into the model with the minimum number of running ash conveying air compressors so as to obtain the minimum number of running ash conveying air compressors;
and the evaluation module is used for evaluating the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant according to the minimum number of the ash conveying air compressors.
Example four
A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the energy saving potential evaluation method suitable for the positive pressure dense phase pneumatic ash conveying system of the coal-fired power plant when executing the computer program.
EXAMPLE five
A computer-readable storage medium, storing a computer program which, when executed by a processor, implements the steps of the energy saving potential assessment method applicable to a positive pressure dense phase pneumatic ash conveying system of a coal-fired power plant.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. An energy-saving potential evaluation method suitable for a positive pressure concentrated phase pneumatic ash conveying system of a coal-fired power plant is characterized by comprising the following steps of:
obtaining the optimal ash falling time working condition and the total fly ash amount model of the boiler of each ash conveying unit under different load working conditions through an ash conveying system characteristic test;
establishing a minimum ash conveying air compressor operation number model based on the optimal ash falling time working condition of the ash conveying unit and a boiler total fly ash quantity model;
the actual furnace coal entering parameters of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant are led into the model with the minimum number of running ash conveying air compressors to obtain the minimum number of running ash conveying air compressors;
and evaluating the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant according to the minimum number of running ash conveying air compressors.
2. The energy-saving potential evaluation method applicable to the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant as claimed in claim 1, wherein in the step 1), through an ash conveying system characteristic test, the optimal ash falling time working condition and the boiler total fly ash amount model of each ash conveying unit under the rated load of 100%, 90%, 80%, 70%, 60%, 50% and 40% of the units are obtained.
3. The energy-saving potential evaluation method suitable for the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant according to claim 1, characterized by recording the coal feeding amount of the boiler, the total fly ash amount of the boiler and the loading operation number of the ash conveying air compressors under each load working condition and drawing a curve of the minimum number of the ash conveying air compressors under different fly ash amounts.
4. The energy-saving potential evaluation method suitable for the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant according to claim 3, wherein the minimum number of ash conveying air compressors to be operated in the period of time is obtained by an interpolation method based on the curve of the minimum number of ash conveying air compressors to be operated according to actual fired coal parameters of the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant.
5. The energy-saving potential evaluation method suitable for the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant as claimed in claim 1, wherein the energy-saving potential of the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant is evaluated by comparing the number of the current ash conveying air compressors with the minimum number of the calculated ash conveying air compressors.
6. An energy-saving potential evaluation system suitable for a positive-pressure concentrated-phase pneumatic ash conveying system of a coal-fired power plant comprises:
the test module is used for obtaining the optimal ash falling time working condition of each ash conveying unit and a total fly ash amount model of the boiler under different load working conditions through an ash conveying system characteristic test;
the building module is used for building a model with the least number of running ash conveying air compressors based on the optimal ash falling time working condition of the ash conveying unit and a total fly ash amount model of the boiler;
the calculation module is used for guiding actual as-fired coal parameters of the positive-pressure concentrated-phase pneumatic ash conveying system of the coal-fired power plant into the model with the minimum number of running ash conveying air compressors so as to obtain the minimum number of running ash conveying air compressors;
and the evaluation module is used for evaluating the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant according to the minimum number of the ash conveying air compressors.
7. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for estimating energy saving potential of the positive pressure concentrated phase pneumatic ash conveying system of coal-fired power plant according to any one of claims 1 to 5.
8. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the method for evaluating energy saving potential of a positive pressure dense-phase pneumatic ash conveying system of a coal-fired power plant according to any one of claims 1 to 5.
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| CN113919177A (en) * | 2021-10-28 | 2022-01-11 | 西安热工研究院有限公司 | Energy-saving potential evaluation method and system suitable for wet desulphurization system of coal-fired power plant |
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