CN113312794B - 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, an energy-saving potential evaluation system, energy-saving potential evaluation equipment and an energy-saving potential evaluation storage medium suitable for a positive pressure dense phase pneumatic ash conveying system of a coal-fired power plant, which comprise the following steps: acquiring an optimal ash falling time working condition of each ash conveying unit and a total fly ash quantity model of the boiler 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; introducing actual coal parameters of a positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant into the minimum ash conveying air compressor operation number model to obtain the minimum ash conveying air compressor operation number; according to the minimum number of the ash conveying air compressors, the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant is evaluated, 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 ash conveying systems of coal-fired power plants, and relates to an energy-saving potential evaluation method, an energy-saving potential evaluation system, energy-saving potential evaluation equipment and an energy-saving potential evaluation storage medium suitable for a positive pressure dense phase pneumatic ash conveying system of a coal-fired power plant.
Background
The flue gas generated by the combustion of the boiler of the coal-fired power plant contains a large amount of fly ash, the fly ash is trapped in a dust removal system and then is conveyed to an ash warehouse for storage by a positive pressure concentrated phase pneumatic ash conveying system at the lower part of the fly ash conveying system, and then is conveyed to the outside of a plant by an automobile, a conveying air source of the ash conveying system is provided by an ash conveying air compressor, and the energy consumption of the ash conveying system is the station power consumption of the ash conveying air compressor.
The existing energy consumption evaluation method of the ash conveying system only carries out transverse comparison on the plant power consumption of the ash conveying air compressor and other power plants, and the influence of coal quality of coal is not considered, so that the energy consumption evaluation basis of the ash conveying system is disordered, and the difference between the ash conveying system and the lowest energy consumption (target value) which can be achieved under the condition that the ash conveying system and the ash conveying system burn coal with common coal quality can not be evaluated scientifically and accurately, namely the energy saving potential of the ash conveying system.
Therefore, the method for evaluating the energy-saving potential of the air compressor only according to the plant power consumption transverse comparison results of the ash conveying air compressors of different units has limitation. The new evaluation method is required to be put forward, the plant power consumption of the actual ash conveying air compressor is compared with the target value according to the capacity and the coal quality of the evaluated unit, the energy consumption level of the actual ash conveying air compressor is evaluated, and the energy saving potential of an ash conveying system is obtained.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide 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.
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 of:
acquiring an optimal ash falling time working condition of each ash conveying unit and a total fly ash quantity model of the boiler 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;
introducing actual coal parameters of a positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant into the minimum ash conveying air compressor operation number model to obtain the minimum ash conveying air compressor operation number;
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 operation number of the minimum 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 boiler total fly ash quantity model are obtained under the rated load of 100%, 90%, 80%, 70%, 60%, 50% and 40% of units.
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 operation number of the least ash conveying air compressors under different fly ash amount conditions.
And obtaining the minimum number of ash conveying air compressors in the period of time by an interpolation method based on the minimum number of ash conveying air compressors running curve according to the actual coal feeding parameters of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant.
And comparing the running number of the current ash conveying air compressors with the calculated running number of the least 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 conservation potential evaluation system suitable for a positive pressure dense phase pneumatic ash conveying system of a coal-fired power plant, comprising:
the test module is used for acquiring the optimal ash falling time working condition of each ash conveying unit and the total fly ash quantity model of the boiler under different load working conditions through the characteristic test of the ash conveying system;
the construction module is used for constructing a minimum ash conveying air compressor running number model based on the optimal ash falling time working condition of the ash conveying unit and the boiler total fly ash quantity model;
the calculation module is used for guiding the actual coal-feeding parameters of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant into the minimum ash conveying air compressor running number model so as to obtain the minimum ash conveying air compressor running number;
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 operation number of the minimum 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 assessment method applicable to a positive pressure dense phase pneumatic ash conveying system of a coal-fired power plant when the computer program is executed.
A computer readable storage medium storing a computer program which when executed by a processor performs the steps of the energy saving potential assessment method applicable to positive pressure dense phase pneumatic ash conveying systems of coal fired power plants.
The invention has the following beneficial effects:
when the energy-saving potential evaluation method, system, equipment and storage medium suitable for the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant are specifically operated, the minimum ash conveying air compressor operation number model is constructed according to 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 minimum ash conveying air compressor operation number obtained by the minimum ash conveying air compressor operation number model, the interference of unit operation load and coal quality on energy-saving potential calculation of the ash conveying system is eliminated, and the evaluation accuracy is higher.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a graph showing the number of operating stages of the minimum ash conveying air compressor in the invention.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, 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 example embodiments in accordance with the invention.
Example 1
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 of:
1) Acquiring an optimal ash falling time working condition of each ash conveying unit and a total fly ash quantity model of the boiler 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) Introducing actual coal parameters of a positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant into the minimum ash conveying air compressor operation number model to obtain the minimum ash conveying air compressor operation number;
4) And (3) evaluating the energy-saving potential of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant according to the operation number of the minimum ash conveying air compressors obtained in the step (3).
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 boiler total fly ash quantity model are obtained under the rated load of 100%, 90%, 80%, 70%, 60%, 50% and 40% of units, wherein in the process of obtaining, the ash falling time of each ash conveying unit is gradually increased, so that the system achieves the maximum ash falling time working condition of sustainable operation on the premise of no ash blockage and safe operation. 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 minimum ash conveying air compressor operation number curve under different fly ash amount conditions, and obtaining the minimum ash conveying air compressor operation number in the period of time by an interpolation method according to the minimum ash conveying air compressor operation number curve.
And comparing the current operation number of the ash conveying air compressors with the calculated operation number of the least 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 generation unit, taking four ash conveying units and an ash conveying system with four air compressors as examples, the specific process is as follows:
1) Building a boiler fly ash quantity model
In the combustion test of coal quality (three common coal types, the received base ash is A respectively) ar1 、A ar2 、A ar3 And A is ar1 <A ar2 <A ar3 ) When the ash conveying system is used, through an ash conveying system characteristic test, the ash falling time of each ash conveying unit is gradually increased under the rated load of 100%, 90%, 80%, 70%, 60%, 50% and 40% of units, so that the system achieves the maximum ash falling time working condition of sustainable operation on the premise of no ash blockage and safe operation.
Boiler coal feeding quantity under seven load working conditions(t/h) is (subscripts 1, 2, 3 represent three common coal types, and the base ash is A respectively ar1 、A ar2 、A ar3 )：
G 1 ＝[G 100 G 90 G 80 G 70 G 60 G 50 G 40 ] 1
G 2 ＝[G 100 G 90 G 80 G 70 G 60 G 50 G 40 ] 2
G 3 ＝[G 100 G 90 G 80 G 70 G 60 G 50 G 40 ] 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 is A respectively) ar1 、A ar2 、A ar3 )：
A 1 ＝A ar1 G 1 ＝[A 100 A 90 A 80 A 70 A 60 A 50 A 40 ] 1
A 2 ＝A ar2 G 2 ＝[A 100 A 90 A 80 A 70 A 60 A 50 A 40 ] 2
A 3 ＝A ar3 G 3 ＝[A 100 A 90 A 80 A 70 A 60 A 50 A 40 ] 3
2) Establishing a running number model of the minimum ash conveying air compressor
In the characteristic test of the ash conveying system, the number of loading operation tables 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 is A respectively ar1 、A ar2 、A ar3 )：
N opt1 ＝[N 100 N 90 N 80 N 70 N 60 N 50 N 40 ] 1
N opt2 ＝[N 100 N 90 N 80 N 70 N 60 N 50 N 40 ] 2
N opt3 ＝[N 100 N 90 N 80 N 70 N 60 N 50 N 40 ] 3
Under a single working condition, the condition that the loading and unloading of part of air compressors are switched to operate can occur, and the number of the air compressors is as follows:
wherein N is Loading For the number of air compressors in a loading operation state continuously, k is the number of the air compressors with switching operation of loading and unloading, and t Loading Load run time for air compressor, t total Is the duration of the operating condition.
Obtaining the running number curves of the least ash conveying air compressor under the condition of different fly ash amounts (subscripts 1, 2 and 3 represent three common coal types, and the base ash is A respectively ar1 、A ar2 、A ar3 ) Referring to fig. 2:
N opt1 ＝f(G 1 )
N opt2 ＝f(G 2 )
N opt3 ＝f(G 3 )
3) Introducing actual coal parameters
Taking the process of a certain unit ash conveying system running for a period of time as an evaluation object, and leading in corresponding parameters of the coal in the furnace as shown in tables 1 and 2:
TABLE 1
TABLE 2
4) Accounting of minimum number of operation units of ash conveying air compressors in actual operation process
According to the running number curve of the minimum ash conveying air compressor obtained in the step 2), so as toBased on the method, the minimum number N of the operation of the ash conveying air compressors in the period of time is obtained by an interpolation method opt The method specifically comprises the following steps:
for the period of timeAt A ar1 And A ar2 Examples of the case include:
obtaining N opt The method comprises the following steps:
5) Energy-saving potential accounting for ash conveying system
Counting the actual power consumption rate of the ash conveying air compressor in the period to be W Actual practice is that of The generating capacity of the unit is P Generating electricity The running power of a single ash conveying air compressor is P Ash conveying air compressor The energy-saving potential of the ash folding and conveying system in the period of time is as follows:
namely, compared with the power consumption rate corresponding to the operation number of the air compressors with the least ash conveying system, the power consumption rate of the ash conveying system of the current unit can be reduced through optimized operation.
Example III
The energy-saving potential evaluation system suitable for the positive pressure dense phase pneumatic ash conveying system of the coal-fired power plant comprises:
the test module is used for acquiring the optimal ash falling time working condition of each ash conveying unit and the total fly ash quantity model of the boiler under different load working conditions through the characteristic test of the ash conveying system;
the construction module is used for constructing a minimum ash conveying air compressor running number model based on the optimal ash falling time working condition of the ash conveying unit and the boiler total fly ash quantity model;
the calculation module is used for guiding the actual coal-feeding parameters of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant into the minimum ash conveying air compressor running number model so as to obtain the minimum ash conveying air compressor running number;
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 operation number of the minimum ash conveying air compressors.
Example IV
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 assessment method applicable to a positive pressure dense phase pneumatic ash conveying system of a coal-fired power plant when the computer program is executed.
Example five
A computer readable storage medium storing a computer program which when executed by a processor performs the steps of the energy saving potential assessment method applicable to positive pressure dense phase pneumatic ash conveying systems of coal fired power plants.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (4)
1. The energy-saving potential evaluation method suitable for the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant is characterized by comprising the following steps of:
acquiring an optimal ash falling time working condition of each ash conveying unit and a total fly ash quantity model of the boiler 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;
introducing actual coal parameters of a positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant into the minimum ash conveying air compressor operation number model to obtain the minimum ash conveying air compressor operation number;
evaluating the energy-saving potential of a positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant according to the operation number of the minimum ash conveying air compressors;
the method specifically comprises the following steps: obtaining optimal ash falling time working conditions of each ash conveying unit and a boiler total fly ash quantity model under rated loads of 100%, 90%, 80%, 70%, 60%, 50% and 40% of units through an ash conveying system characteristic test;
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 minimum ash conveying air compressor operation number curve under different fly ash amount conditions;
obtaining the minimum number of ash conveying air compressors in the period of time by an interpolation method based on the minimum number of ash conveying air compressors running curve according to the actual coal feeding parameters of the positive pressure concentrated phase pneumatic ash conveying system of the coal-fired power plant;
comparing the running number of the current ash conveying air compressors with the calculated running number of the least 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;
the number of the air compressors is as follows:
wherein N is Loading For the number of air compressors in the loading running state continuously, k is the switching operation of loading and unloadingAir compressor numbering of row, t Loading Load run time for air compressor, t total The duration of the working condition;
obtaining a running number curve of the least ash conveying air compressors under different fly ash quantity conditions;
according to the running number curve of the minimum ash conveying air compressor, the average flow of the coal into the furnace is calculatedBased on the method, the minimum number N of the operation of the ash conveying air compressors in the period of time is obtained by an interpolation method opt The method specifically comprises the following steps:
the weighted average value of the base ash content received by the coal fed into the furnace in the periodIn the process of receiving base ash A from coal entering furnace ar1 And the coal fed into the furnace receives the basic ash A ar2 Examples of the case include:
obtaining N opt The method comprises the following steps:
wherein N is opt1 N opt2 The number of the loading operation of the ash conveying air compressors under two stable working conditions is counted, and the actual power consumption rate of the ash conveying air compressors in the period of time is counted to be W Actual practice is that of The generating capacity of the unit is P Generating electricity The running power of a single ash conveying air compressor is P Ash conveying air compressor The energy-saving potential of the ash folding and conveying system in the period of time is as follows:
2. an energy saving potential evaluation system suitable for a positive pressure concentrated phase pneumatic ash conveying system of a coal-fired power plant, which is characterized by comprising the steps of realizing 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.
3. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, realizes the steps of the energy saving potential evaluation method applicable to the positive pressure dense phase pneumatic ash conveying system of a coal-fired power plant as claimed in claim 1.
4. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor performs the steps of the energy saving potential evaluation method for a positive pressure dense phase pneumatic ash conveying system of a coal-fired power plant according to claim 1.
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| CN114647190A (en) * | 2022-03-17 | 2022-06-21 | 国能龙源环保有限公司 | Ash conveying energy-saving optimization method and system for thermal power generating unit |
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