CN112229663A - Air preheater air leakage rate online determination method, device, equipment and storage medium - Google Patents
Air preheater air leakage rate online determination method, device, equipment and storage medium Download PDFInfo
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
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Abstract
The embodiment of the invention discloses an air preheater air leakage rate online determination method, device, equipment and storage medium. The method comprises the following steps: determining a first pressure difference of an inlet flue of the air preheater and a second pressure difference of an outlet flue of the air preheater; determining the inlet mass flow of the inlet flue gas according to the first pressure difference and determining the outlet mass flow of the outlet flue gas according to the second pressure difference; and determining the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow. According to the scheme, the first pressure difference of the inlet flue of the air preheater and the second pressure difference of the outlet flue of the air preheater are determined in real time, the inlet mass flow of inlet flue gas and the outlet mass flow of outlet flue gas are determined respectively based on the first pressure difference and the second pressure difference, and then the air leakage rate of the air preheater is determined according to the inlet mass flow and the outlet mass flow, so that the air leakage rate of the air preheater is monitored on line, the accuracy of the air leakage rate is improved, and accurate guidance is provided for follow-up maintenance work.
Description
Technical Field
The embodiment of the invention relates to the technical field of boilers, in particular to an air preheater air leakage rate online determination method, device, equipment and storage medium.
Background
An Air preheater (Air Pre-head) is arranged at the tail part of the boiler, absorbs the waste heat of the flue gas through an internal heat storage sheet, preheats the primary Air and the secondary Air which enter the boiler to a certain temperature, is a device which makes full use of the waste heat of the boiler, reduces the heat loss and improves the heat efficiency of the boiler, and is generally called as an Air preheater for short.
The air preheater mainly comprises a dynamic part and a static part, and a certain air leakage inevitably exists in the air preheater due to a certain pressure difference among primary air, secondary air and flue gas, so that a sealing device can be installed at the dynamic and static joint part of the air preheater. However, in order to ensure the normal operation of the air preheater, a certain gap is reserved between the dynamic state and the static state of the air preheater in the cold state adjustment process; the air preheater in the operation process can also generate mushroom-shaped deformation to increase the gap between the moving and static air due to the temperature difference of the upper end and the lower end, and a certain pressure difference exists between the smoke and the air. Therefore, the determination of the air leakage rate of the air preheater has important significance for guiding the maintenance work.
The traditional method is mainly to determine the air leakage rate of the air preheater by an oxygen method, and the air leakage rate is low in accuracy and incapable of accurately guiding maintenance work due to the fact that the sectional areas of an inlet and an outlet of a flue are large, the difference of smoke components in the flue is large, the single-point measurement representativeness is poor, and the oxygen measurement delay is large.
Disclosure of Invention
The embodiment of the invention provides an air preheater air leakage rate online determination method, device, equipment and storage medium, so as to improve the accuracy of the air leakage rate.
In a first aspect, an embodiment of the present invention provides an online determination method for an air leakage rate of an air preheater, including:
determining a first pressure difference of an inlet flue of the air preheater and a second pressure difference of an outlet flue of the air preheater;
determining the inlet mass flow of the inlet flue gas according to the first pressure difference and determining the outlet mass flow of the outlet flue gas according to the second pressure difference;
and determining the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow.
In a second aspect, an embodiment of the present invention further provides an online determination device for an air leakage rate of an air preheater, including:
the pressure difference determining module is used for determining a first pressure difference of an inlet flue of the air preheater and a second pressure difference of an outlet flue of the air preheater;
the mass flow determining module is used for determining the inlet mass flow of the inlet flue gas according to the first pressure difference and determining the outlet mass flow of the outlet flue gas according to the second pressure difference;
and the air leakage rate determining module is used for determining the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, implement the air preheater air leakage rate online determination method of the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a storage medium, on which a computer program is stored, where the program, when executed by a processor, implements the online determination method for air leakage rate of an air preheater according to the first aspect.
The embodiment of the invention provides an air preheater air leakage rate online determination method, device, equipment and storage medium, which can determine a first pressure difference of an inlet flue of an air preheater and a second pressure difference of an outlet flue of the air preheater in real time, determine inlet mass flow of inlet flue gas and outlet mass flow of outlet flue gas based on the first pressure difference and the second pressure difference respectively, and further determine the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow, thereby realizing online monitoring of the air leakage rate of the air preheater, improving the accuracy of the air leakage rate and providing accurate guidance for subsequent overhaul work.
Drawings
Fig. 1 is a flowchart of an air leakage rate online determination method for an air pre-heater according to an embodiment of the present invention;
fig. 2 is a flowchart of an air leakage rate online determination method for an air pre-heater according to a second embodiment of the present invention;
fig. 3 is a schematic diagram illustrating distribution of sampling points of a circular flue according to a second embodiment of the present invention;
fig. 4 is a schematic distribution diagram of sampling points of a rectangular or square flue according to a second embodiment of the present invention;
fig. 5 is a schematic partial structural diagram of a first flue matrix measurement device according to a second embodiment of the present invention;
fig. 6 is a structural diagram of an online air leakage rate determining device of an air preheater according to a third embodiment of the present invention;
fig. 7 is a structural diagram of an electronic device according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.
Example one
Fig. 1 is a flowchart of an online determination method for an air preheater air leakage rate according to an embodiment of the present invention, where the present embodiment is applicable to online determination of the air leakage rate of the air preheater, and the method may be executed by an air preheater air leakage rate determination device, and the air preheater air leakage rate determination device may be implemented by software and/or hardware and may be integrated in an electronic device, where the electronic device may be an intelligent device with a data processing function, such as a notebook computer, a desktop computer, or a server. Referring to fig. 1, the method may include the steps of:
and S110, determining a first pressure difference of an inlet flue of the air preheater and a second pressure difference of an outlet flue of the air preheater.
The air preheater is generally divided into three types, namely a plate type air preheater, a rotary air preheater and a tube type air preheater, and the rotary air preheater is widely adopted by large and medium-sized power plants due to the advantages of high heat transfer density, compact structure, corrosion resistance, long service life, low operating cost and the like and becomes a mainstream air preheater. The air preheater of the present embodiment is exemplified by a rotary air preheater. The first pressure difference may be a pressure difference between the windward side and the leeward side of the inlet flue of the air preheater, and the second pressure difference may be a pressure difference between the windward side and the leeward side of the outlet flue of the air preheater. It can be understood that when airflow flows in the flue, the windward side is impacted by the airflow, the kinetic energy of the airflow can be converted into pressure energy, the pressure of the airflow can be called as "full pressure" or "positive pressure", the pressure of the leeward side is static pressure in the air pipe because the leeward side is not impacted by the airflow, the pressure of the leeward side can be called as "static pressure" or "negative pressure", the first pressure difference can be determined according to the positive pressure and the negative pressure of the inlet flue of the air preheater, and the second pressure difference can be determined according to the positive pressure and the negative pressure of the outlet flue of the air preheater.
The first pressure difference and the second pressure difference are determined similarly, and the first pressure difference is taken as an example. In one example, the inlet flue of the air preheater may be divided into a limited number of spaces according to the shape and the cross-sectional area thereof, the central point of each space is used as a sampling point, the positive pressure and the negative pressure of each sampling point are determined, then the positive pressure of the inlet flue is determined according to the positive pressure of each sampling point, and the negative pressure of the inlet flue is determined according to the negative pressure of each sampling point, so as to obtain the first pressure difference.
In one example, when the inlet flue is a circular flue, the flow velocity distribution of the flue gas is uniform, and the diameter of the flue is small, for example, less than 0.3m, the center of the inlet flue can be directly used as a sampling point, and the positive pressure and the negative pressure of the sampling point can be respectively used as the positive pressure and the negative pressure of the inlet flue. When the diameter of the flue is large, the circular flue can be divided into a plurality of equal-area circular rings according to the diameter of the flue, a proper sampling point is selected in each equal-area circular ring, the positive pressure and the negative pressure of each sampling point are respectively determined, and the positive pressure and the negative pressure of the inlet flue are respectively determined according to the positive pressure and the negative pressure of each sampling point. Optionally, the average of the positive pressures of the sampling points may be used as the positive pressure of the inlet flue, and the average of the negative pressures of the sampling points may be used as the negative pressure of the outlet flue. In one example, when the inlet flue is rectangular or square and the cross-sectional area of the flue is large, the cross-section of the rectangular or square flue may be divided into an appropriate number of equal-area spaces, and the center of each equal-area space is taken as a sampling point, so as to obtain the positive pressure and the negative pressure of each sampling point and the positive pressure and the negative pressure of the inlet flue. For a rectangular or square flue with a smaller cross-sectional area and uniform flue gas flow velocity distribution, the center of the cross section can be used as a sampling point, for example, when the cross-sectional area of the rectangular or square flue is smaller than 0.1 square meter and the flue gas flow velocity distribution is uniform, the center of the cross section can be used as a sampling point.
S120, determining the inlet mass flow of the inlet flue gas according to the first pressure difference and determining the outlet mass flow of the outlet flue gas according to the second pressure difference.
The mass flow rate is the mass of the fluid flowing through the effective cross section of the closed pipeline or the open groove in unit time, in this embodiment, the inlet mass flow rate of the inlet flue gas may be the mass of the fluid flowing through the flue in unit time, and the outlet mass flow rate of the outlet flue gas may be the mass of the fluid flowing through the flue in unit time. The inlet mass flow determination process is similar to the outlet mass flow determination process, and the embodiment takes the inlet mass flow as an example. Alternatively, the inlet mass flow may be determined from the product of the volumetric flow and the density of the inlet flue gas passing through the flue per unit time. The volume flow of inlet flue gas passing through the flue is related to the flow speed of the inlet flue gas, and the pressure difference between positive pressure and negative pressure of the same sampling point has a certain mapping relation with the flow speed of the inlet flue gas passing through the point, so that the flow speed of the inlet flue gas can be determined according to the first pressure difference, and then the inlet mass flow can be obtained according to the flow speed of the inlet flue gas and the density of the inlet flue gas.
And S130, determining the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow.
Optionally, the mass flow leaked by the air preheater may be determined according to the inlet mass flow and the outlet mass flow, and the air leakage rate may be determined according to the leaked mass flow. For example, the difference between the outlet mass flow and the inlet mass flow can be determined, and the ratio of the difference to the inlet mass flow can be used as the air leakage rate of the air preheater. The embodiment can acquire the pressure difference between the inlet flue and the outlet flue in real time, thereby monitoring the air leakage rate of the air preheater in real time and effectively guiding the subsequent maintenance work. Compared with the traditional mode, the air leakage rate is determined according to the inlet mass flow and the outlet mass flow, oxygen measurement is not needed, and the accuracy of the air leakage rate is improved.
The embodiment of the invention provides an air preheater air leakage rate online determination method, which can determine a first pressure difference at an inlet of an air preheater and a second pressure difference at an outlet of the air preheater in real time, determine an inlet mass flow of inlet flue gas and an outlet mass flow of outlet flue gas based on the first pressure difference and the second pressure difference respectively, and further determine the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow, thereby realizing online monitoring of the air leakage rate of the air preheater, improving the accuracy of the air leakage rate and providing accurate guidance for subsequent overhaul work.
Example two
Fig. 2 is a flowchart of an online determination method for an air leakage rate of an air preheater according to a second embodiment of the present invention, where the present embodiment is optimized based on the foregoing embodiment, and referring to fig. 2, the method may include the following steps:
s210, acquiring positive pressure on the windward side and negative pressure on the leeward side of a first sampling point at an inlet flue of the air preheater through a first flue matrix measuring device, and acquiring positive pressure on the windward side and negative pressure on the leeward side of a second sampling point at an outlet flue of the air preheater through a second flue matrix measuring device.
The first flue matrix measuring device is arranged at an inlet flue of the air preheater, and the second flue matrix measuring device is arranged at an outlet flue of the air preheater. The flue matrix measuring device is used for measuring positive pressure and negative pressure of an inlet flue and an outlet flue, optionally, the flue matrix measuring device can comprise a pressure guiding device and a pressure sensor, the pressure sensor is connected with the pressure guiding device, the pressure guiding device is used for acquiring positive pressure and negative pressure of a sampling point, and the pressure sensor is used for measuring the pressure values of the positive pressure and the negative pressure of the sampling point acquired by the pressure guiding device. The pressure guide device can comprise a self-deashing device and a shell wrapping the self-deashing device. On the one hand, the self-ash-removing device can clean the soot in the pressure guide pipe, so that the soot is prevented from blocking the flue matrix measuring device, and on the other hand, the pressure in the flue can also be led out. The shell wrapping the sampling port and the self-cleaning device can be made of wear-resistant ceramics so as to improve the wear resistance. The first flue matrix measuring device is arranged at the inlet flue, and the second flue matrix measuring device is arranged at the outlet flue. The measurement process is similar, and the embodiment takes the first flue matrix measurement device as an example.
The first sampling point is a pressure sampling point set according to the shape and cross-sectional area of the inlet flue. And a pressure guide device can be arranged at each pressure taking point and used for guiding the pressure of the pressure taking point out of the flue. It should be noted that, the sampling position for setting the pressure taking point should avoid the flue elbow and the part with the sharply changed section, and the straight pipe section is preferably selected. For example, the sampling locations may be located no less than 6 diameters downstream from the variable head, valves, reducer and no less than 3 diameters upstream from the aforementioned components. When the flue meets the requirement of the sampling position, a pressure taking point can be arranged according to the shape and the sectional area of the flue; otherwise, the voltage pickup point may be increased appropriately.
Taking the flue meeting the requirement of the sampling position as an example, the number and the position of the pressure points can be determined according to the diameter of the circular flue, for example, when the diameter of the flue is smaller than a first threshold value, one pressure point can be set, and the pressure point is set at the center of the circular flue, and when the diameter of the flue is larger than the first threshold value, the circular flue can be divided by using the center of the circular flue as the center of a circle to obtain a plurality of concentric circles, and the areas of two adjacent circles are equal. The pressure points can be arranged on the diameter line of the concentric circles, and the diameter, the number of equal-area rings and the number of the pressure points of the circular flue can be referred to table 1. Exemplarily, referring to fig. 3, fig. 3 is a schematic distribution diagram of sampling points of a circular flue according to a second embodiment of the present invention. Fig. 3 is an example of dividing the circular flue into two concentric circles, that is, including two equal-area circular rings, and providing four pressure points, a1, a2, a3 and a4, where the distances between each pressure point and the inner wall of the circular flue are as shown in fig. 3. The relation between the pressure points corresponding to the equal-area rings with different numbers and the inner wall of the circular flue can be referred to table 2, and the table 2 exemplarily gives the distances from partial pressure points to the inner wall of the circular flue, wherein D is the diameter of the circular flue. The set threshold is adopted when the distance from the pressure point to the inner wall of the circular flue is smaller than the set threshold, for example, 25mm is adopted when the distance from the pressure point to the inner wall of the circular flue is smaller than 25 mm.
Table 1 diameter of circular flue, number of corresponding concentric circles and number of pressure points.
| Diameter of circular flue (m) | Equal area ring number | Number of pressure points |
| <0.3 | 0 | 1 |
| 0.3-0.6 | 1-2 | 2-8 |
| 0.6-1.0 | 2-3 | 4-12 |
| 1.0-2.0 | 3-4 | 6-16 |
| 2.0-4.0 | 4-5 | 8-20 |
| >4.0 | 5 | 10-20 |
TABLE 2 distance between pressure point and inner wall of circular flue
Exemplarily, referring to fig. 4, fig. 4 is a schematic distribution diagram of sampling points of a rectangular or square flue according to a second embodiment of the present invention. Fig. 4 is an example of dividing a cross section of a rectangular or square flue into 16 equal-area rectangular or square spaces, and the center of each space, i.e., a black dot in fig. 4, is taken as a pressure-taking point. The relationship among the cross-sectional area of the rectangular or square flue, the length of the long side of the equal-area space and the number of the pressure points can be referred to table 3, and table 3 exemplarily gives the relationship among several cross-sectional areas, the lengths of the long side of the equal-area space and the number of the pressure points.
TABLE 3 number of pressure points and space division of rectangular (square) flue
Exemplarily, referring to fig. 5, fig. 5 is a schematic partial structural diagram of a first flue matrix measurement apparatus according to a second embodiment of the present invention. This first flue matrix measuring device is including drawing pressure device and pressure sensor (fig. 5 not shown), draws pressure device including from ash removal device A and wear-resisting pottery B, and wear-resisting pottery B parcel is in the sample connection and from ash removal device A's outside, and every pressure taking point can place one and draw pressure device to draw the flue through drawing pressure device with the pressure of this pressure taking point, measure the pressure value by the pressure sensor outside the flue. When there are more pressure points, the pressure points may be grouped, for example, the first flue matrix measuring device shown in fig. 5 may measure the pressure of 54 pressure points and divide the 54 pressure inducing devices into 6 groups. When there are a plurality of pressure points, in order to improve the accuracy of pressure measurement, the positive pressure value of each pressure point may be averaged to be the positive pressure of the inlet flue. In one example, the pressure inducing devices on the positive pressure side of each group may be connected to obtain a mean positive pressure value for each group, and then the mean positive pressure values for each group may be averaged to obtain the positive pressure of the inlet stack. For example, in each group of pressure guiding devices in fig. 5, 9 pressure guiding devices are respectively communicated through a pipeline C, the pressure of each pressure guiding device is averaged through the pipeline C to obtain the positive pressure of each group, then the positive pressure value of each group is measured through a pressure sensor, and the positive pressure value of each group is averaged to obtain the positive pressure of the inlet flue. The negative pressure of the inlet flue and the positive and negative pressure of the outlet flue are determined similarly.
S220, taking the difference value of the positive pressure and the negative pressure of the first sampling point as a first pressure difference of the inlet flue of the air preheater and taking the difference value of the positive pressure and the negative pressure of the second sampling point as a second pressure difference of the outlet flue of the air preheater.
S230, determining the flow rate of the inlet flue gas according to the first mapping relation of the flow rate of the inlet flue gas and the inlet pressure difference and the second pressure difference according to the second mapping relation of the flow rate of the outlet flue gas and the outlet pressure difference.
Optionally, the first mapping relationship may be as follows:
wherein, VIntoIs the flue gas flow velocity of an inlet flue, and has the unit of m/s and KIntoThe coefficient of manufacture of the first flue matrix measuring device for the inlet flue is dependent on the way the first flue matrix measuring device is manufactured, Kv1Is KIntoCorrection coefficient of, Δ PIntoIs a first pressure difference in units Pa, ρIntoIs the smoke density of the inlet smoke in kg/m3. After the first pressure difference is determined, the flue gas flow speed of the inlet flue gas can be obtained by combining the formula. Accordingly, the second mapping relationship may be as follows:
wherein, VGo outIs the flue gas flow velocity of an outlet flue, and has the unit of m/s and KGo outThe manufacturing factor of the second flue matrix measuring device for the outlet flue is dependent on the manufacturing mode of the second flue matrix measuring device, Kv2Is KGo outCorrection coefficient of, Δ PGo outIs the second pressure difference in Pa, ρGo outIs the smoke density of the inlet smoke in kg/m3。
S240, determining the inlet mass flow of the inlet flue gas according to an inlet flue gas mass flow formula and the inlet flue gas flow rate, and determining the outlet mass flow of the outlet flue gas according to an outlet flue gas mass flow formula and the outlet flue gas flow rate.
Optionally, the inlet flue gas mass flow formula may be as follows:
Qm is inserted into＝3600*AInto*VInto*ρInto
Wherein Q ism is inserted intoIs the inlet mass flow of the inlet flue gas, unit kg/h, AIntoIs the sectional area of the inlet flue,unit m2. Accordingly, the outlet flue gas mass flow equation may be as follows:
Qm out＝3600*AGo out*VGo out*ρGo out
Wherein Q ism outIs the outlet mass flow of the outlet flue gas, unit kg/h, AGo outIs the cross-sectional area of the inlet flue in m2. The inlet flue gas mass flow and the outlet flue gas mass flow can be respectively obtained through the formulas.
And S250, determining the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow.
Alternatively, the air leakage rate of the air preheater can be determined according to the inlet mass flow and the outlet mass flow by combining the following formula.
And delta is the air leakage rate, and the air leakage rate of the air preheater can be determined through the formula.
On the basis of the embodiment, positive pressure and negative pressure of an inlet flue and positive pressure and negative pressure of an outlet flue are respectively obtained through a first flue matrix measuring device and a second flue matrix measuring device to obtain first pressure difference of the inlet flue and second pressure difference of the outlet flue, then flue gas mass flow of the inlet flue and the outlet flue are respectively determined based on the first pressure difference and the second pressure difference, so that the air leakage rate of the air preheater is obtained according to the inlet flue gas mass flow and the outlet flue gas mass flow, the oxygen amount of the inlet flue and the outlet flue does not need to be measured, the condition that flue gas components are not uniformly distributed, the oxygen amount measurement is not representative is avoided, and the accuracy of the air leakage rate is improved.
EXAMPLE III
Fig. 6 is a structural diagram of an online air preheater air leakage rate determining apparatus according to a third embodiment of the present invention, which may execute the online air preheater air leakage rate determining method according to the foregoing embodiment, and with reference to fig. 6, the apparatus may include:
the pressure difference determining module 31 is used for determining a first pressure difference of an inlet flue of the air preheater and a second pressure difference of an outlet flue of the air preheater;
the mass flow determining module 32 is configured to determine an inlet mass flow of the inlet flue gas according to the first pressure difference and determine an outlet mass flow of the outlet flue gas according to the second pressure difference;
and the air leakage rate determining module 33 is configured to determine the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow.
The third embodiment of the invention provides an air preheater air leakage rate online determination device, which can determine a first pressure difference of an inlet flue of an air preheater and a second pressure difference of an outlet flue of the air preheater in real time, determine an inlet mass flow of inlet flue gas and an outlet mass flow of outlet flue gas based on the first pressure difference and the second pressure difference respectively, and further determine the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow, thereby realizing online monitoring of the air leakage rate of the air preheater, improving the accuracy of the air leakage rate and providing accurate guidance for subsequent overhaul work.
On the basis of the above embodiment, the differential pressure determining module 31 is specifically configured to:
acquiring positive pressure on the windward side and negative pressure on the leeward side of a first sampling point at the inlet of the air preheater through a first flue matrix measuring device, and acquiring positive pressure on the windward side and negative pressure on the leeward side of a second sampling point at the outlet of the air preheater through a second flue matrix measuring device, wherein the first flue matrix measuring device is arranged at the inlet of the air preheater, and the second flue matrix measuring device is arranged at the outlet of the air preheater;
and taking the difference value of the positive pressure and the negative pressure of the first sampling point as a first pressure difference of the inlet of the air preheater and taking the difference value of the positive pressure and the negative pressure of the second sampling point as a second pressure difference of the outlet of the air preheater.
On the basis of the foregoing embodiment, the mass flow rate determination module 32 is specifically configured to:
determining the flow rate of the inlet flue gas according to a first mapping relation between the flow rate of the inlet flue gas and the pressure difference of the inlet flue gas and the second mapping relation between the flow rate of the outlet flue gas and the pressure difference of the outlet flue gas and the second pressure difference;
determining the inlet mass flow of the inlet flue gas according to an inlet flue gas mass flow formula and the inlet flue gas flow rate, and determining the outlet mass flow of the outlet flue gas according to an outlet flue gas mass flow formula and the outlet flue gas flow rate.
On the basis of the foregoing embodiment, the air leakage rate determining module 33 is specifically configured to:
determining a difference between the outlet mass flow and the inlet mass flow;
and taking the ratio of the difference value to the inlet mass flow as the air leakage rate of the air preheater.
The air preheater air leakage rate online determination device provided by the embodiment can be used for executing the air preheater air leakage rate online determination method provided by the embodiment, and has corresponding functions and beneficial effects.
Example four
Fig. 7 is a structural diagram of an electronic device according to a fourth embodiment of the present invention, where the electronic device may include one or more processors 41, a memory 42, an input device 43, and an output device 44, where the number of the processors 41 in the electronic device may be one or more, and in fig. 7, taking one processor 41 as an example, the processors 41, the memory 42, the input device 43, and the output device 44 in the electronic device may be connected by a bus or in another manner, and in fig. 7, the connection by the bus is taken as an example.
The memory 42 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the air preheater air leakage rate online determination method in the embodiment of the present invention. The processor 41 executes various functional applications and data processing of the electronic device by running software programs, instructions and modules stored in the memory 42, namely, the air preheater air leakage rate online determination method of the above embodiment is realized.
The memory 42 mainly includes a program storage area and a data storage area, wherein the program storage area can store an operating system and an application program required by at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 42 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 42 may further include memory located remotely from processor 41, which may be connected to the electronic device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 43 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the electronic apparatus. The output device 44 may include a display device such as a display screen, and an audio device such as a speaker and a buzzer.
The electronic device provided by the embodiment of the present invention and the method for determining air leakage rate of the air preheater on line provided by the above embodiment belong to the same inventive concept, and the technical details that are not described in detail in the embodiment can be referred to the above embodiment, and the embodiment has the same beneficial effects as the method for determining air leakage rate of the air preheater on line.
EXAMPLE five
An embodiment of the present invention provides a storage medium, where a computer program is stored, where the computer program is used, when executed by a processor, to execute an online air leakage rate determining method for an air preheater, where the method includes:
determining a first pressure difference of an inlet flue of the air preheater and a second pressure difference of an outlet flue of the air preheater;
determining the inlet mass flow of the inlet flue gas according to the first pressure difference and determining the outlet mass flow of the outlet flue gas according to the second pressure difference;
and determining the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow.
Storage media for embodiments of the present invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take a variety of forms, including, but not limited to: an electromagnetic signal, an optical signal, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, Radio Frequency (RF), etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An air preheater air leakage rate online determination method is characterized by comprising the following steps:
determining a first pressure difference of an inlet flue of the air preheater and a second pressure difference of an outlet flue of the air preheater;
determining the inlet mass flow of the inlet flue gas according to the first pressure difference and determining the outlet mass flow of the outlet flue gas according to the second pressure difference;
and determining the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow.
2. The method of claim 1, wherein determining a first pressure differential of an air preheater inlet stack and a second pressure differential of an air preheater outlet stack comprises:
acquiring positive pressure on the windward side and negative pressure on the leeward side of a first sampling point at an inlet flue of the air preheater through a first flue matrix measuring device, and acquiring positive pressure on the windward side and negative pressure on the leeward side of a second sampling point at an outlet flue of the air preheater through a second flue matrix measuring device, wherein the first flue matrix measuring device is arranged at the inlet flue of the air preheater, and the second flue matrix measuring device is arranged at the outlet flue of the air preheater;
and taking the difference value of the positive pressure and the negative pressure of the first sampling point as a first pressure difference of the inlet flue of the air preheater and taking the difference value of the positive pressure and the negative pressure of the second sampling point as a second pressure difference of the outlet flue of the air preheater.
3. The method of claim 1, wherein determining an inlet mass flow rate of inlet flue gas from the first pressure differential and an outlet mass flow rate of outlet flue gas from the second pressure differential comprises:
determining the flow rate of the inlet flue gas according to a first mapping relation between the flow rate of the inlet flue gas and the pressure difference of the inlet flue gas and the second mapping relation between the flow rate of the outlet flue gas and the pressure difference of the outlet flue gas and the second pressure difference;
determining the inlet mass flow of the inlet flue gas according to an inlet flue gas mass flow formula and the inlet flue gas flow rate, and determining the outlet mass flow of the outlet flue gas according to an outlet flue gas mass flow formula and the outlet flue gas flow rate.
4. The method of claim 1, wherein determining the air leakage rate of the air preheater based on the inlet mass flow rate and the outlet mass flow rate comprises:
determining a difference between the outlet mass flow and the inlet mass flow;
and taking the ratio of the difference value to the inlet mass flow as the air leakage rate of the air preheater.
5. An air preheater air leakage rate online determination device is characterized by comprising:
the pressure difference determining module is used for determining a first pressure difference of an inlet flue of the air preheater and a second pressure difference of an outlet flue of the air preheater;
the mass flow determining module is used for determining the inlet mass flow of the inlet flue gas according to the first pressure difference and determining the outlet mass flow of the outlet flue gas according to the second pressure difference;
and the air leakage rate determining module is used for determining the air leakage rate of the air preheater according to the inlet mass flow and the outlet mass flow.
6. The apparatus of claim 5, wherein the differential pressure determination module is specifically configured to:
acquiring positive pressure on the windward side and negative pressure on the leeward side of a first sampling point at the inlet of the air preheater through a first flue matrix measuring device, and acquiring positive pressure on the windward side and negative pressure on the leeward side of a second sampling point at the outlet of the air preheater through a second flue matrix measuring device, wherein the first flue matrix measuring device is arranged at the inlet of the air preheater, and the second flue matrix measuring device is arranged at the outlet of the air preheater;
and taking the difference value of the positive pressure and the negative pressure of the first sampling point as a first pressure difference of the inlet of the air preheater and taking the difference value of the positive pressure and the negative pressure of the second sampling point as a second pressure difference of the outlet of the air preheater.
7. The apparatus of claim 5, wherein the mass flow determination module is specifically configured to:
determining the flow rate of the inlet flue gas according to a first mapping relation between the flow rate of the inlet flue gas and the pressure difference of the inlet flue gas and the second mapping relation between the flow rate of the outlet flue gas and the pressure difference of the outlet flue gas and the second pressure difference;
determining the inlet mass flow of the inlet flue gas according to an inlet flue gas mass flow formula and the inlet flue gas flow rate, and determining the outlet mass flow of the outlet flue gas according to an outlet flue gas mass flow formula and the outlet flue gas flow rate.
8. The apparatus of claim 5, wherein the air leakage rate determination module is specifically configured to:
determining a difference between the outlet mass flow and the inlet mass flow;
and taking the ratio of the difference value to the inlet mass flow as the air leakage rate of the air preheater.
9. An electronic device, comprising:
one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, implement the air preheater air leakage rate online determination method of any of claims 1-4.
10. A storage medium having stored thereon a computer program, which when executed by a processor implements the air preheater air leakage rate online determination method according to any one of claims 1 to 4.
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| CN112229663B (en) | 2023-01-10 |
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