CN116085822A - Method, device, equipment and medium for calculating mixed air volume of coal mill inlet - Google Patents
Method, device, equipment and medium for calculating mixed air volume of coal mill inlet Download PDFInfo
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Abstract
The invention provides a method, a device, equipment and a medium for calculating the air quantity of mixed air at an inlet of a coal mill, and belongs to the technical field of thermal power generation. The method comprises the following steps: based on the hot air density, the velocity measurement tube coefficient, the measured cross-section area and the measured cross-section dynamic pressure of the hot air channel, the hot air volume is obtained; based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct, obtaining a hot air constant pressure specific heat capacity and a cold air constant pressure specific heat capacity; and obtaining the mixed air volume of the coal mill inlet based on the hot air volume, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant. According to the invention, the mixed air volume of the inlet of the coal mill is calculated indirectly according to the hot air volume of the hot air duct with longer rectifying section and good flow field uniformity, and the influence of the cold and hot air baffles and the air duct structure on the mixed air flow field during direct measurement is avoided, so that the measured mixed air volume is more accurate.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a method, a device, equipment and a medium for calculating the air quantity of mixed air at an inlet of a coal mill.
Background
In the operation process of the utility boiler, the mixed air volume of the coal mill inlet is used as one of important parameters for guiding the operation adjustment and the combustion optimization adjustment of the boiler, and the measurement accuracy has great influence on the safe, economical and environment-friendly operation of the boiler, so that the accuracy of the measured mixed air volume of the coal mill inlet is ensured.
At present, direct measurement is mainly carried out through a measuring device arranged on a mixing air duct at an inlet of a coal mill, and the mode has a simple structure and a simple calculation method, but the direct measurement has the problem that a mixing air field is influenced by cold air, hot air adjustment, a baffle and the size of the air duct, so that the measured mixing air quantity deviation is larger.
Disclosure of Invention
The embodiment of the invention aims to provide a method, a device, equipment and a medium for calculating the air quantity of mixed air at an inlet of a coal mill, so as to solve the problem of larger deviation of the air quantity of the mixed air measured at present.
In order to achieve the above object, according to a first aspect of the embodiments of the present invention, there is provided a method for calculating an inlet mixed air volume of a coal mill, including:
acquiring a speed measuring tube coefficient, a measuring cross-section area, a measuring cross-section dynamic pressure, a hot air density, a hot air temperature and a hot air pressure of a hot air duct of a coal mill of a thermal power plant, acquiring a cold air temperature and a cold air pressure of a cold air duct of the coal mill of the thermal power plant, and acquiring a mixed air temperature of an inlet of the coal mill of the thermal power plant;
based on the hot air density, the velocity measurement tube coefficient, the measured cross-section area and the measured cross-section dynamic pressure of the hot air channel, the hot air volume is obtained;
based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct, obtaining a hot air constant pressure specific heat capacity and a cold air constant pressure specific heat capacity;
and obtaining the mixed air quantity of the coal mill inlet based on the hot air quantity, the hot air constant-pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant-pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant.
Optionally, the hot air density of the hot air duct is obtained by:
acquiring the atmospheric pressure of the place where the coal mill of the thermal power plant is located;
calculating the atmospheric pressure of the coal mill of the thermal power plant, the hot air pressure of the hot air duct and the hot air temperature of the hot air duct by using the formula (1) to obtain the hot air density of the hot air duct;
wherein ρ represents the hot air density of the hot air duct; p (P) a Representing the atmospheric pressure of the place where the coal mill of the thermal power plant is located; p (P) 1 Representing the hot air pressure of the hot air duct; t is t 1 The hot air temperature of the hot air duct is indicated.
Optionally, the hot air density, the velocity measurement tube coefficient, the measurement cross-section area and the measurement cross-section dynamic pressure based on the hot air duct obtain the hot air volume, and the method comprises the following steps:
calculating the hot air density, the velocity tube coefficient, the measured cross-sectional area and the measured cross-sectional dynamic pressure of the hot air channel by utilizing the formula (2) to obtain the hot air quantity;
wherein m is 1 Representing the hot air quantity; k represents the velocity tube coefficient of the hot air duct; s represents the measured cross-sectional area of the hot air duct; p (P) d The dynamic pressure of the measurement section of the hot air duct is represented; ρ represents the hot air density of the hot air duct.
Optionally, the obtaining the hot air constant pressure specific heat capacity and the cold air constant pressure specific heat capacity based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct includes:
calculating the hot air pressure of the hot air duct by using a formula (3) to obtain the hot air constant pressure specific heat capacity;
wherein F (P) 1 ) A piecewise function representing the specific heat capacity of the hot air at constant pressure; c (C) p1 (1)，C p1 (2)，...C p1 (n) represents the hot air constant pressure specific heat capacity of different hot air pressure intervals; z is Z 1 ，Z 2 ，...Z n-1 ，Z n A section point representing hot air pressure/cold air pressure;
calculating the cold air pressure of the cold air duct by using a formula (4) to obtain a cold air constant pressure specific heat capacity;
wherein F (P) 2 ) A piecewise function representing the specific heat capacity of the cold air at constant pressure; c (C) p2 (1)，C p2 (2)，...C p2 (n) represents cold air constant pressure specific heat capacity of different cold air pressure intervals; z is Z 1 ，Z 2 ，...Z n-1 ，Z n The interval point representing the hot air pressure/cold air pressure.
Optionally, the obtaining the mixed air inlet volume of the coal mill based on the hot air volume, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill of the thermal power plant includes:
calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill of the thermal power plant by utilizing a formula (5) to obtain the mixed air quantity of the inlet of the coal mill;
wherein m represents the air quantity of mixed air at the inlet of the coal mill; m is m 1 Representing the hot air quantity; c (C) p1 The specific heat capacity of the hot air at constant pressure is represented; c (C) p2 The constant pressure specific heat capacity of cold air is represented; t is t 1 Representing a hot air ductThe temperature of the hot air; t is t 2 The cold air temperature of the cold air duct is represented; and t represents the temperature of mixed air at the inlet of a coal mill of the thermal power plant.
Alternatively, equation (5) is obtained by:
based on the law of conservation of energy, calculating the hot air quantity, the cold air quantity and the mixed air quantity at the inlet of the coal mill to establish a formula (6);
wherein m is 2 Representing the cold air quantity;
calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of a hot air duct, the mixed air temperature of an inlet of a coal mill of a thermal power plant and the heat quantity of the hot air to the mixed air reduction so as to establish a formula (7);
wherein Q is 1 Representing the heat of the reduction of the hot air to the mixed air;
calculating cold air quantity, cold air constant pressure specific heat capacity, hot air temperature of a cold air duct, mixed air temperature of an inlet of a coal mill of a thermal power plant and heat added from cold air to mixed air to establish a formula (8);
wherein Q is 2 Indicating the increased heat from the cool air to the mixed air;
calculating the heat quantity from hot air to mixed air and the heat quantity from cold air to mixed air based on the law of conservation of mass to establish a formula (9);
substituting the formula (9) into the formula (6) for calculation to obtain the formula (5).
In a second aspect of the embodiment of the present invention, there is provided a device for calculating an inlet mixed air volume of a coal mill, including:
the data acquisition module is used for acquiring a speed measuring tube coefficient, a measuring section area, a measuring section dynamic pressure, a hot air density, a hot air temperature and a hot air pressure of a hot air duct of the coal mill of the thermal power plant, acquiring a cold air temperature and a cold air pressure of a cold air duct of the coal mill of the thermal power plant and acquiring a mixed air temperature of an inlet of the coal mill of the thermal power plant;
the hot air volume calculation module is used for obtaining hot air volume based on the hot air density, the velocity measurement tube coefficient, the measurement cross-section area and the measurement cross-section dynamic pressure of the hot air channel;
the specific heat capacity calculation module is used for obtaining the hot air constant pressure specific heat capacity and the cold air constant pressure specific heat capacity based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct;
the mixed air quantity calculation module is used for obtaining the mixed air quantity of the coal mill inlet based on the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant.
Optionally, the mixed air volume calculating module is specifically configured to:
calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill of the thermal power plant by utilizing a formula (5) to obtain the mixed air quantity of the inlet of the coal mill;
wherein m represents the air quantity of mixed air at the inlet of the coal mill; m is m 1 Representing the hot air quantity; c (C) p1 The specific heat capacity of the hot air at constant pressure is represented; c (C) p2 The constant pressure specific heat capacity of cold air is represented; t is t 1 The hot air temperature of the hot air duct is represented; t is t 2 The cold air temperature of the cold air duct is represented; and t represents the temperature of mixed air at the inlet of a coal mill of the thermal power plant.
In a third aspect of the embodiments of the present invention, there is provided a processor comprising: the system comprises a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and the machine-readable instructions execute the method for calculating the mixed air volume of the inlet of the coal mill when being executed by the processor.
According to a fourth aspect of the embodiment of the present invention, there is provided a computer-readable storage medium storing computer instructions that, when executed on a computer, cause the computer to perform the above-described method for calculating the amount of mixed wind at an inlet of a coal mill.
In the embodiment of the invention, the hot air quantity is obtained by measuring the cross-sectional area and the dynamic pressure of the cross section based on the hot air density, the velocity measurement pipe coefficient and the measuring cross-sectional area of the hot air channel; based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct, obtaining a hot air constant pressure specific heat capacity and a cold air constant pressure specific heat capacity; based on the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant, the mixed air quantity of the coal mill inlet is obtained, and the mixed air quantity of the coal mill inlet is indirectly calculated according to the hot air quantity of the hot air duct with longer rectifying section and good flow field uniformity, so that the influence of the cold air, the hot air baffle and the air duct structure on the mixed air flow field during direct measurement is avoided, and the measured mixed air quantity is more accurate.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a schematic flow chart of a method for calculating the air quantity of mixed air at an inlet of a coal mill according to an embodiment of the invention;
FIG. 2 is a schematic diagram of measuring inlet air quantity of a coal mill according to an embodiment of the invention;
FIG. 3 is a schematic diagram of the relationship between the hot air/cold air pressure and the hot air/cold air constant pressure specific heat capacity provided by the embodiment of the invention;
fig. 4 is a schematic structural diagram of a device for calculating the air quantity of mixed air at an inlet of a coal mill.
Detailed Description
The following describes the detailed implementation of the embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
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; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Referring to fig. 1, fig. 1 is a flow chart of a method for calculating an inlet mixed air volume of a coal mill according to an embodiment of the present invention, the method includes the following steps:
s100, acquiring a speed measuring tube coefficient, a measuring cross-section area, a measuring cross-section dynamic pressure, a hot air density, a hot air temperature and a hot air pressure of a hot air duct of a coal mill of the thermal power plant, acquiring a cold air temperature and a cold air pressure of a cold air duct of the coal mill of the thermal power plant, and acquiring a mixed air temperature of an inlet of the coal mill of the thermal power plant;
the invention is used for calculating the mixed air quantity of the coal mill inlet of the thermal power plant, and is not suitable for calculating the mixed air quantity of the coal mill inlet of other coal mills.
As shown in fig. 2, in the boiler operation process of the thermal power station, the outlet of the coal mill divides the primary air into two paths, the primary air entering the cold air duct and the hot air duct is used as temperature-adjusting air, a preheater is not needed for heating, the primary air entering the hot air duct is needed to be heated through the preheater, then the primary air and the primary air are summarized at the inlet of the coal mill, and then the gas is mixed and sent into the coal mill for maintaining a certain gas-powder mixture so as to be convenient for transportation, and sufficient oxygen is provided for the fuel in the initial combustion stage.
Based on the above, if the mixed air volume is measured directly at the inlet of the coal mill through the measuring device, the influence of the cold and hot air baffles and the air duct structure on the mixed air flow field can be caused when the mixed air volume is received, so that the error of the measurement result is larger, but the hot air duct has the characteristics of longer rectifying section and good flow field uniformity, so that the mixed air volume of the inlet of the coal mill is indirectly calculated through the hot air duct of the hot air duct, the measurement error caused by direct measurement can be avoided, and the measured mixed air volume of the inlet of the coal mill is more accurate.
The speed measuring tube coefficient of the hot air duct refers to the ratio of the wind speed obtained by testing the measuring device under the condition of standard flow fields such as a wind tunnel and the like to the wind speed obtained by testing a standard pitot tube, and can be provided by equipment manufacturers.
The measurement cross-sectional area of the hot air duct refers to the gas flow cross-sectional area of the measurement device at the hot air duct, and the unit is: m2, the design value can be taken.
The dynamic pressure of the measuring section of the hot air duct is the dynamic pressure obtained by directly testing the measuring sectional area of the measuring device, and the unit is: pa, can be measured by an air volume measuring device.
The unit of the hot air density of the hot air duct is as follows: kg/m3.
The unit of the hot air temperature of the hot air duct, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill is the temperature, and the temperature can be measured by an armored couple.
The unit of the hot air pressure of the hot air duct and the cold air pressure of the cold air duct is as follows: pa, which can be measured by a pressure transmitter.
In an embodiment, the hot air temperature and the hot air pressure of the hot air duct, the cold air temperature and the cold air pressure of the cold air duct, and the mixed air temperature of the inlet of the coal mill can be measured in a multi-point manner, and an average value is obtained, so that the measurement error is reduced, and the subsequently measured mixed air volume of the inlet of the coal mill is ensured to be more accurate.
S200, obtaining the hot air volume based on the hot air density, the velocity measurement tube coefficient, the measured cross-section area and the measured cross-section dynamic pressure of the hot air channel;
the hot air quantity refers to the mass flow of hot air in the hot air duct, and the unit is kg/s.
S300, obtaining a hot air constant pressure specific heat capacity and a cold air constant pressure specific heat capacity based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct;
the constant-pressure specific heat capacity of hot air refers to the heat absorbed by the hot air at the temperature increased by 1K under the condition of unchanged pressure, and the constant-pressure specific heat capacity of cold air refers to the heat absorbed by the cold air at the temperature increased by 1K under the condition of unchanged pressure, wherein the unit is J/(kg. ℃).
The pressure of the air and the specific heat capacity have a certain relation, so that the specific heat capacity of the hot air at a fixed pressure and the specific heat capacity of the cold air at a fixed pressure can be known through the hot air pressure of the hot air duct and the cold air pressure of the cold air duct.
S400, obtaining the mixed air quantity of the coal mill inlet based on the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant.
In the embodiment, according to the hot air density, the velocity tube coefficient, the measured cross-sectional area and the measured cross-sectional dynamic pressure of the hot air duct, the hot air quantity is calculated, then according to the hot air pressure of the hot air duct and the cold air pressure of the cold air duct, the hot air constant pressure specific heat capacity and the cold air constant pressure specific heat capacity are calculated, and finally according to the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant, the mixed air quantity of the coal mill inlet is calculated. Because the hot air channel has the characteristics of longer rectifying section and good flow field uniformity, the mixed air quantity of the inlet of the coal mill is indirectly calculated through the hot air quantity of the hot air channel, and the influence of the cold and hot air baffles and the air channel structure on the mixed air flow field when the mixed air quantity is directly measured is avoided, so that the measured mixed air quantity is more accurate.
Optionally, the hot air density of the hot air duct is obtained by:
the first step: acquiring the atmospheric pressure of the place where the coal mill of the thermal power plant is located;
and a second step of: calculating the atmospheric pressure of the coal mill of the thermal power plant, the hot air pressure of the hot air duct and the hot air temperature of the hot air duct by using the formula (1) to obtain the hot air density of the hot air duct;
wherein ρ represents the hot air density of the hot air duct; p (P) a Representing the atmospheric pressure of the place where the coal mill of the thermal power plant is located; p (P) 1 Representing the hot air pressure of the hot air duct; t is t 1 The hot air temperature of the hot air duct is indicated.
For ease of understanding, the following is illustrative:
the atmospheric pressure of the place where the coal mill of a certain thermal power plant is located is 90000Pa, the hot air pressure of the hot air duct is 15000Pa, the hot air temperature of the hot air duct is 360 ℃, and then the hot air temperature is calculated by substituting into a formula (1):
In the embodiment, by calculating the atmospheric pressure of the coal mill of the thermal power plant, the hot air pressure of the hot air duct and the hot air temperature of the hot air duct by using the formula (1), the accurate hot air density can be calculated, so that the accuracy of the subsequent calculation of the hot air quantity is improved.
Optionally, the step S200 specifically includes:
calculating the hot air density, the velocity tube coefficient, the measured cross-sectional area and the measured cross-sectional dynamic pressure of the hot air channel by utilizing the formula (2) to obtain the hot air quantity;
wherein m is 1 Representing the hot air quantity; k represents the velocity tube coefficient of the hot air duct; s represents the measured cross-sectional area of the hot air duct; p (P) d The dynamic pressure of the measurement section of the hot air duct is represented; ρ represents the hot air density of the hot air duct.
For ease of understanding, the following is illustrative:
the coefficient of a speed measuring tube of a coal mill of a certain thermal power plant is 0.84, the measuring cross-sectional area of a hot air duct is 3.6m2, the dynamic pressure of the measuring cross-section of the hot air duct is 750Pa, the density of hot air is 0.57695kg/m3, and then the hot air density is calculated by substituting into a formula (2):
In the embodiment, by calculating the hot air density, the velocity measurement tube coefficient of the hot air duct, the measurement cross-sectional area of the hot air duct and the measurement cross-sectional dynamic pressure of the hot air duct by using the formula (2), the accurate hot air quantity can be calculated, so that the accuracy of the subsequent calculation of the mixed air quantity at the inlet of the coal mill is improved.
Optionally, the step S300 specifically includes:
calculating the hot air pressure of the hot air duct by using a formula (3) to obtain the hot air constant pressure specific heat capacity;
wherein F (P) 1 ) A piecewise function representing the specific heat capacity of the hot air at constant pressure; c (C) p1 (1)，C p1 (2)，...C p1 (n) represents the hot air constant pressure specific heat capacity of different hot air pressure intervals; z is Z 1 ，Z 2 ，...Z n-1 ，Z n A section point representing hot air pressure/cold air pressure;
calculating the cold air pressure of the cold air duct by using a formula (4) to obtain a cold air constant pressure specific heat capacity;
wherein F (P) 2 ) A piecewise function representing the specific heat capacity of the cold air at constant pressure; c (C) p2 (1)，C p2 (2)，...C p2 (n) represents cold air constant pressure specific heat capacity of different cold air pressure intervals; z is Z 1 ，Z 2 ，...Z n-1 ，Z n The interval point representing the hot air pressure/cold air pressure.
It should be noted that, by equally dividing the hot air pressure of the hot air duct and the cold air pressure of the cold air duct into a plurality of pressure intervals, each pressure interval corresponds to a constant pressure specific heat capacity, and the divided interval point is Z in the above formula 1 ，Z 2 ，...Z n-1 ，Z n . Wherein, the constant pressure specific heat capacity corresponding to the pressure interval divided by different proportions is different. The embodiment of the invention does not limit the proportion of proportion division, and can be specifically selected according to actual requirements.
When the hot air pressure of the hot air duct and the cold air pressure of the cold air duct are in the same pressure interval, the corresponding constant-pressure specific heat capacities are different. For example: the hot air pressure of the hot air duct and the cold air pressure of the cold air duct are both 8000Pa, the corresponding hot air constant pressure specific heat capacity is 1.003. 1.003J/(kg. ℃), and the corresponding cold air constant pressure specific heat capacity is 1.000. 1.000J/(kg. ℃).
For ease of understanding, the following is illustrative:
as shown in fig. 3, fig. 3 is a schematic diagram of the relationship between hot air/cold air pressure and hot air/cold air constant pressure specific heat capacity provided by the embodiment of the invention.
Assuming that the range of the hot air pressure and the cold air pressure is 20000Pa, and then equal-proportion division is performed in units of 20000Pa, that is, 20000Pa is divided into 10 parts, and the pressure section of the hot air pressure are expressed as: (0, 2000 Pa)]，(2000Pa，4000Pa]，(4000Pa,6000Pa]....(18000Pa,20000Pa]Whereas 2000pa,4000pa in the interval, 18000pa,20000pa represent the pressure interval point, i.e. Z in the above formula 1 ，Z 2 ，...Z n-1 ，Z n 。
(0, 2000 Pa.) the corresponding hot air specific heat capacity was 1.003J/(kg. ℃) the corresponding cold air specific heat capacity was 1.000J/(kg. ℃), the corresponding hot air specific heat capacity was 1.004J/(kg. ℃) the corresponding cold air specific heat capacity was 1.002J/(kg. ℃), and the corresponding hot air specific heat capacity was 3.005J/(kg. ℃) the corresponding cold air specific heat capacity was 3.003J/(kg. ℃).
Based on the above, equation (3) can be expressed as:
equation (4) can be expressed as:
if the ranges of the hot air pressure and the cold air pressure are divided according to other ratios, the process of calculating the specific heat capacity of the constant pressure can be analogized with reference to the above process, and the detailed description is omitted here.
In the embodiment, by calculating the hot air pressure of the hot air duct and the cold air pressure of the cold air duct by using the formula (3) and the formula (4), the accurate hot air/cold air constant pressure specific heat capacity can be calculated, so that the accuracy of subsequently calculating the mixed air volume of the inlet of the coal mill of the thermal power plant is improved.
Optionally, the step S400 specifically includes:
calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill of the thermal power plant by utilizing a formula (5) to obtain the mixed air quantity of the inlet of the coal mill;
wherein m represents the air quantity of mixed air at the inlet of the coal mill; m is m 1 Indicating hot airAn amount of; c (C) p1 The specific heat capacity of the hot air at constant pressure is represented; c (C) p2 The constant pressure specific heat capacity of cold air is represented; t is t 1 The hot air temperature of the hot air duct is represented; t is t 2 The cold air temperature of the cold air duct is represented; and t represents the temperature of mixed air at the inlet of a coal mill of the thermal power plant.
For ease of understanding, the following is illustrative:
the hot air volume of a hot air duct of a coal mill of a certain thermal power plant is 88.96kg/s, the hot air constant pressure specific heat capacity is 1.005J/(kg. ℃) and the cold air constant pressure specific heat capacity is 1.002J/(kg. ℃), the hot air temperature is 360 ℃, the cold air temperature is 20 ℃, the inlet mixed air temperature of the coal mill is 280 ℃, and then the mixed air temperature is substituted into a formula (5) for calculation:
In the embodiment, the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet are calculated by using the formula (5), so that the mixed air quantity of the coal mill inlet is calculated. Because the calculation logic in the formula (5) only participates in the hot air quantity, the influence of cold and hot air baffles and an air duct structure on the mixed air flow field is avoided, the hot air duct rectifying section corresponding to the hot air quantity is longer, and the flow field uniformity is good, so that the mixed air quantity of the inlet of the coal mill of the thermal power plant, which is indirectly calculated through the hot air quantity, is more accurate.
Alternatively, equation (5) is obtained by:
the first step: based on the law of conservation of energy, calculating the hot air quantity, the cold air quantity and the mixed air quantity at the inlet of the coal mill to establish a formula (6);
wherein m is 2 Representing the cold air quantity;
specifically, because the hot air in the hot air duct and the cold air in the cold air duct are collected at the inlet of the coal mill, the sum of the hot air quantity and the cold air quantity is equal to the mixed air quantity at the inlet of the coal mill based on the law of mass conservation, so that the formula (6) is established.
And a second step of: calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of a hot air duct, the mixed air temperature of an inlet of a coal mill of a thermal power plant and the heat quantity of the hot air to the mixed air reduction so as to establish a formula (7);
wherein Q is 1 Representing the heat of the reduction of the hot air to the mixed air;
specifically, according to the heat calculation principle, the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the mixed air temperature of the inlet of the coal mill and the heat quantity reduced from hot air to mixed air are calculated, and a formula (7) is established.
And a third step of: calculating cold air quantity, cold air constant pressure specific heat capacity, hot air temperature of a cold air duct, mixed air temperature of an inlet of a coal mill of a thermal power plant and heat added from cold air to mixed air to establish a formula (8);
wherein Q is 2 Indicating the increased heat from the cool air to the mixed air;
specifically, according to the heat calculation principle, the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the mixed air temperature of the inlet of the coal mill and the heat quantity reduced from hot air to mixed air are calculated, and a formula (8) is established.
Fourth step: calculating the heat quantity from hot air to mixed air and the heat quantity from cold air to mixed air based on the law of conservation of mass to establish a formula (9);
specifically, in an isolated system, the change in total energy of a system can only be equal to the amount of energy transferred into or out of the system, while the total energy remains unchanged, according to the principle of conservation of energy, so that the amount of heat reduced from hot wind to mixed wind is equal to the amount of heat increased from cold wind to mixed wind, thereby establishing formula (9).
Fifth step: substituting the formula (9) into the formula (6) for calculation to obtain the formula (5).
Specifically, it will
Performing transformation to obtain
Then ∈>
Substituted into->
Obtaining
。
In the present embodiment, based on the law of conservation of mass, a construction is made
Then based on the law of conservation of energy, establish +.>
Then will
Substituted into->
Transforming to obtain
And->
Calculation ofThe mixed air quantity of the inlet of the coal mill can be calculated only by hot air quantity, and the influence of a cold air baffle and an air duct structure on a mixed air flow field when the mixed air quantity is directly measured is avoided, so that the calculated mixed air quantity of the inlet of the coal mill is more accurate.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a device for calculating the air volume of mixed air at an inlet of a coal mill according to the embodiment of the invention.
Based on the same inventive concept, the embodiment of the invention further provides a device 200 for calculating the air quantity of mixed air at the inlet of a coal mill, which comprises:
the data acquisition module 210 is configured to acquire a velocity tube coefficient, a measured cross-sectional area, a measured cross-sectional dynamic pressure, a hot air density, a hot air temperature and a hot air pressure of a hot air duct of the coal mill of the thermal power plant, acquire a cold air temperature and a cold air pressure of a cold air duct of the coal mill of the thermal power plant, and acquire a mixed air temperature of an inlet of the coal mill of the thermal power plant;
the hot air volume calculation module 220 is used for obtaining hot air volume based on the hot air density, the velocity measurement tube coefficient, the measured cross-section area and the measured cross-section dynamic pressure of the hot air channel;
the specific heat capacity calculation module 230 is configured to obtain a hot air constant pressure specific heat capacity and a cold air constant pressure specific heat capacity based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct;
the mixed air volume calculation module 240 is configured to obtain a mixed air volume of the coal mill inlet based on the hot air volume, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant.
Optionally, the mixed air volume calculating module 240 is specifically configured to:
calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill of the thermal power plant by utilizing a formula (5) to obtain the mixed air quantity of the inlet of the coal mill;
wherein m represents the air quantity of mixed air at the inlet of the coal mill; m is m 1 Representing the hot air quantity; c (C) p1 The specific heat capacity of the hot air at constant pressure is represented; c (C) p2 The constant pressure specific heat capacity of cold air is represented; t is t 1 The hot air temperature of the hot air duct is represented; t is t 2 The cold air temperature of the cold air duct is represented; and t represents the temperature of mixed air at the inlet of a coal mill of the thermal power plant.
It should be understood that, the device corresponds to the above embodiment of the method for calculating the mixed air volume of the inlet of the coal mill, and can perform the steps related to the above embodiment of the method, and specific functions of the device may be referred to the above description, and detailed descriptions thereof are omitted herein for avoiding repetition. The device includes at least one software functional module that can be stored in memory in the form of software or firmware (firmware) or cured in an Operating System (OS) of the device.
Based on the same inventive concept, the embodiments of the present invention also provide an electronic device including one or more processors (CPUs), an input/output interface, a network interface, and a memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
Based on the same inventive concept, embodiments of the present invention also provide a computer readable storage medium having stored thereon instructions for, when executed by a processor, performing a program adapted to perform the method steps of: acquiring a speed measuring tube coefficient, a measuring cross-section area, a measuring cross-section dynamic pressure, a hot air density, a hot air temperature and a hot air pressure of a hot air duct of a coal mill of a thermal power plant, acquiring a cold air temperature and a cold air pressure of a cold air duct of the coal mill of the thermal power plant, and acquiring a mixed air temperature of an inlet of the coal mill of the thermal power plant; based on the hot air density, the velocity measurement tube coefficient, the measured cross-section area and the measured cross-section dynamic pressure of the hot air channel, the hot air volume is obtained; based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct, obtaining a hot air constant pressure specific heat capacity and a cold air constant pressure specific heat capacity; and obtaining the mixed air quantity of the coal mill inlet based on the hot air quantity, the hot air constant-pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant-pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant.
In one embodiment, the method for calculating the mixed wind volume of the inlet of the coal mill further includes: acquiring the atmospheric pressure of the place where the coal mill of the thermal power plant is located; calculating the atmospheric pressure of the coal mill of the thermal power plant, the hot air pressure of the hot air duct and the hot air temperature of the hot air duct by using the formula (1) to obtain the hot air density of the hot air duct;
the method comprises the steps of carrying out a first treatment on the surface of the Wherein ρ represents the hot air density of the hot air duct; p (P) a Representing the atmospheric pressure of the place where the coal mill of the thermal power plant is located; p (P) 1 Representing the hot air pressure of the hot air duct; t is t 1 The hot air temperature of the hot air duct is indicated.
In one embodiment, the method for calculating the mixed wind volume of the inlet of the coal mill further includes: heat to the hot air duct by using the formula (2)Calculating the wind density, the velocity measurement pipe coefficient, the measured cross-section area and the measured cross-section dynamic pressure to obtain the hot air quantity;
the method comprises the steps of carrying out a first treatment on the surface of the Wherein m is 1 Representing the hot air quantity; k represents the velocity tube coefficient of the hot air duct; s represents the measured cross-sectional area of the hot air duct; p (P) d The dynamic pressure of the measurement section of the hot air duct is represented; ρ represents the hot air density of the hot air duct.
In one embodiment, the method for calculating the mixed wind volume of the inlet of the coal mill further includes: calculating the hot air pressure of the hot air duct by using a formula (3) to obtain the hot air constant pressure specific heat capacity;
the method comprises the steps of carrying out a first treatment on the surface of the Wherein F (P) 1 ) A piecewise function representing the specific heat capacity of the hot air at constant pressure; c (C) p1 (1)，C p1 (2)，...C p1 (n) represents the hot air constant pressure specific heat capacity of different hot air pressure intervals; z is Z 1 ，Z 2 ，...Z n-1 ，Z n A section point representing hot air pressure/cold air pressure; calculating the cold air pressure of the cold air duct by using a formula (4) to obtain a cold air constant pressure specific heat capacity; />
The method comprises the steps of carrying out a first treatment on the surface of the Wherein F (P) 2 ) A piecewise function representing the specific heat capacity of the cold air at constant pressure; c (C) p2 (1)，C p2 (2)，...C p2 (n) represents cold air constant pressure specific heat capacity of different cold air pressure intervals; z is Z 1 ，Z 2 ，...Z n-1 ，Z n The interval point representing the hot air pressure/cold air pressure.
In one embodiment, the method for calculating the mixed wind volume of the inlet of the coal mill further includes: calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill of the thermal power plant by utilizing a formula (5) to obtain the mixed air quantity of the inlet of the coal mill;
the method comprises the steps of carrying out a first treatment on the surface of the Wherein m represents the air quantity of mixed air at the inlet of the coal mill; m is m 1 Representing the hot air quantity; c (C) p1 The specific heat capacity of the hot air at constant pressure is represented; c (C) p2 The constant pressure specific heat capacity of cold air is represented; t is t 1 The hot air temperature of the hot air duct is represented; t is t 2 The cold air temperature of the cold air duct is represented; and t represents the temperature of mixed air at the inlet of a coal mill of the thermal power plant.
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.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations of embodiments of the present invention are not described in detail.
In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. The method for calculating the air quantity of the mixed air at the inlet of the coal mill is characterized by comprising the following steps of:
acquiring a speed measuring tube coefficient, a measuring cross-section area, a measuring cross-section dynamic pressure, a hot air density, a hot air temperature and a hot air pressure of a hot air duct of a coal mill of a thermal power plant, acquiring a cold air temperature and a cold air pressure of a cold air duct of the coal mill of the thermal power plant, and acquiring a mixed air temperature of an inlet of the coal mill of the thermal power plant;
based on the hot air density, the velocity measurement tube coefficient, the measured cross-section area and the measured cross-section dynamic pressure of the hot air channel, the hot air volume is obtained;
based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct, obtaining a hot air constant pressure specific heat capacity and a cold air constant pressure specific heat capacity;
and obtaining the mixed air quantity of the coal mill inlet based on the hot air quantity, the hot air constant-pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant-pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant.
2. The method for calculating the air quantity of mixed air at the inlet of the coal mill according to claim 1, wherein the air density of the hot air duct is obtained by:
acquiring the atmospheric pressure of the place where the coal mill of the thermal power plant is located;
calculating the atmospheric pressure of the coal mill of the thermal power plant, the hot air pressure of the hot air duct and the hot air temperature of the hot air duct by using the formula (1) to obtain the hot air density of the hot air duct;
wherein ρ represents the hot air density of the hot air duct; p (P) a Representing the atmospheric pressure of the place where the coal mill of the thermal power plant is located; p (P) 1 Representing the hot air pressure of the hot air duct; t is t 1 The hot air temperature of the hot air duct is indicated.
3. The method for calculating the mixed air volume at the inlet of the coal mill according to claim 1, wherein the hot air volume is obtained based on the hot air density, the velocity tube coefficient, the measured cross-sectional area and the measured cross-sectional dynamic pressure of the hot air duct, and the method comprises the following steps:
calculating the hot air density, the velocity tube coefficient, the measured cross-sectional area and the measured cross-sectional dynamic pressure of the hot air channel by utilizing the formula (2) to obtain the hot air quantity;
wherein m is 1 Representing the hot air quantity; k represents the velocity tube coefficient of the hot air duct; s represents the measured cross-sectional area of the hot air duct; p (P) d The dynamic pressure of the measurement section of the hot air duct is represented; ρ represents the hot air density of the hot air duct.
4. The method for calculating the mixed air volume at the inlet of the coal mill according to claim 1, wherein the obtaining the hot air constant pressure specific heat capacity and the cold air constant pressure specific heat capacity based on the hot air pressure in the hot air duct and the cold air pressure in the cold air duct comprises:
calculating the hot air pressure of the hot air duct by using a formula (3) to obtain the hot air constant pressure specific heat capacity;
wherein F (P) 1 ) A piecewise function representing the specific heat capacity of the hot air at constant pressure; c (C) p1 (1)，C p1 (2)，...C p1 (n) represents the hot air constant pressure specific heat capacity of different hot air pressure intervals; z is Z 1 ，Z 2 ，...Z n-1 ，Z n A section point representing hot air pressure/cold air pressure;
calculating the cold air pressure of the cold air duct by using a formula (4) to obtain a cold air constant pressure specific heat capacity;
wherein F (P) 2 ) A piecewise function representing the specific heat capacity of the cold air at constant pressure; c (C) p2 (1)，C p2 (2)，...C p2 (n) represents cold air constant pressure specific heat capacity of different cold air pressure intervals; z is Z 1 ，Z 2 ，...Z n-1 ，Z n The interval point representing the hot air pressure/cold air pressure.
5. The method for calculating the mixed air volume of the inlet of the coal mill according to claim 1, wherein the obtaining the mixed air volume of the inlet of the coal mill based on the hot air volume, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill of the thermal power plant comprises the following steps:
calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill of the thermal power plant by utilizing a formula (5) to obtain the mixed air quantity of the inlet of the coal mill;
wherein m represents the air quantity of mixed air at the inlet of the coal mill; m is m 1 Representing the hot air quantity; c (C) p1 The specific heat capacity of the hot air at constant pressure is represented; c (C) p2 The constant pressure specific heat capacity of cold air is represented; t is t 1 The hot air temperature of the hot air duct is represented; t is t 2 The cold air temperature of the cold air duct is represented; and t represents the temperature of mixed air at the inlet of a coal mill of the thermal power plant.
6. The method for calculating the amount of mixed wind at the inlet of the coal mill according to claim 5, wherein the formula (5) is obtained by:
based on the law of conservation of energy, calculating the hot air quantity, the cold air quantity and the mixed air quantity at the inlet of the coal mill to establish a formula (6);
wherein m is 2 Representing the cold air quantity;
calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of a hot air duct, the mixed air temperature of an inlet of a coal mill of a thermal power plant and the heat quantity of the hot air to the mixed air reduction so as to establish a formula (7);
wherein Q is 1 Representing the heat of the reduction of the hot air to the mixed air;
calculating cold air quantity, cold air constant pressure specific heat capacity, hot air temperature of a cold air duct, mixed air temperature of an inlet of a coal mill of a thermal power plant and heat added from cold air to mixed air to establish a formula (8);
wherein Q is 2 Indicating the increased heat from the cool air to the mixed air;
calculating the heat quantity from hot air to mixed air and the heat quantity from cold air to mixed air based on the law of conservation of mass to establish a formula (9);
substituting the formula (9) into the formula (6) for calculation to obtain the formula (5).
7. The utility model provides a computing device of coal pulverizer entry mixed wind amount which characterized in that includes:
the data acquisition module is used for acquiring a speed measuring tube coefficient, a measuring section area, a measuring section dynamic pressure, a hot air density, a hot air temperature and a hot air pressure of a hot air duct of the coal mill of the thermal power plant, acquiring a cold air temperature and a cold air pressure of a cold air duct of the coal mill of the thermal power plant and acquiring a mixed air temperature of an inlet of the coal mill of the thermal power plant;
the hot air volume calculation module is used for obtaining hot air volume based on the hot air density, the velocity measurement tube coefficient, the measurement cross-section area and the measurement cross-section dynamic pressure of the hot air channel;
the specific heat capacity calculation module is used for obtaining the hot air constant pressure specific heat capacity and the cold air constant pressure specific heat capacity based on the hot air pressure of the hot air duct and the cold air pressure of the cold air duct;
the mixed air quantity calculation module is used for obtaining the mixed air quantity of the coal mill inlet based on the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the coal mill inlet of the thermal power plant.
8. The device for calculating the mixed air volume at the inlet of the coal mill according to claim 7, wherein the mixed air volume calculating module is specifically configured to:
calculating the hot air quantity, the hot air constant pressure specific heat capacity, the hot air temperature of the hot air duct, the cold air constant pressure specific heat capacity, the cold air temperature of the cold air duct and the mixed air temperature of the inlet of the coal mill of the thermal power plant by utilizing a formula (5) to obtain the mixed air quantity of the inlet of the coal mill;
wherein m represents the air quantity of mixed air at the inlet of the coal mill; m is m 1 Representing the hot air quantity; c (C) p1 The specific heat capacity of the hot air at constant pressure is represented; c (C) p2 The constant pressure specific heat capacity of cold air is represented; t is t 1 The hot air temperature of the hot air duct is represented; t is t 2 The cold air temperature of the cold air duct is represented; and t represents the temperature of mixed air at the inlet of a coal mill of the thermal power plant.
9. An electronic device, comprising: a processor and a memory storing machine readable instructions executable by the processor, which when executed by the processor, perform the method of calculating the amount of mixed air at the inlet of a coal mill of any one of claims 1-6.
10. A computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the method of calculating the amount of mixed wind at the inlet of a coal mill according to any one of claims 1 to 6.
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