CN212539287U - Primary air flow measuring device and primary air flow calculating device - Google Patents
Primary air flow measuring device and primary air flow calculating device Download PDFInfo
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- CN212539287U CN212539287U CN202020281541.7U CN202020281541U CN212539287U CN 212539287 U CN212539287 U CN 212539287U CN 202020281541 U CN202020281541 U CN 202020281541U CN 212539287 U CN212539287 U CN 212539287U
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Abstract
The utility model discloses an air flow measuring device and air flow calculating device once. Primary air flow measurement device includes: the pressure detection assembly comprises a first pressure detection assembly and a second pressure detection assembly, the pressure detection assembly is arranged inside the high-temperature cleaning air branch pipe, the first pressure detection assembly is positioned on the outer side of the elbow of the high-temperature cleaning air branch pipe, and the second pressure detection assembly is positioned on the inner side of the elbow of the high-temperature cleaning air branch pipe; and the air quantity detection assembly is connected with the pressure detection assembly to obtain the pressure difference between the outside pressure of the high-temperature cleaning air branch pipe elbow and the inside pressure of the high-temperature cleaning air branch pipe elbow, and primary air flow is obtained by calculation according to the pressure difference. The utility model discloses a wind flow measurement device can be used to the air heater and prevent stifled washing, can accurately measure the amount of wind once to promote the reliability and the economic nature of flue gas air system operation.
Description
Technical Field
The utility model relates to a boiler technical field, in particular to once wind flow measurement device and once wind flow computing device.
Background
With the advance of ultralow emission transformation of a thermal power plant, more and more power plants have the problems of excessive ammonia injection and ammonium bisulfate blockage caused by excessive ammonia injection, so that the blockage and resistance of the rotary air preheater are increased, the safe and stable operation of a unit is influenced, the power consumption of three fans is increased, and the energy conservation and emission reduction of the thermal power plant are very unfavorable.
In order to reduce the harm caused by the adhesion and blockage of the ammonium bisulfate on the air preheater, a thermal method is adopted, the temperature of a local heat exchange element is periodically raised and heated to reach the sublimation point of the ammonium bisulfate, the decomposition of adhesive substances of a rotor element of the air preheater is realized, and the adhesive substances are peeled off under the action of hot air blowing, so that the harm of the ammonium bisulfate on the heat exchange element of the air preheater is reduced or eliminated. The adopted technical route is divided into a fan forced secondary air circulation method and a hot primary air self-balancing method, and because the fan with high temperature resistance and wear resistance needs to be arranged, and a power supply, a fan foundation and the like need to be configured, the investment is high, the system reliability is poor, and the method is limited in engineering popularization and application; the latter utilizes the hot primary air of high pressure head as the driving heat source, under satisfying the poor power of one, two wind pressure heads and promoting, introduces part hot primary air from the air preheater cold section, through heating and high-speed scouring to local heat transfer component, decomposes the ammonium bisulfate that bonds on the heat transfer component, and this technological route is simple and reliable, and the investment is low, has very good spreading value.
However, the design margin of the primary air used as the air for the pulverizing system is usually not too large, and in order to prevent the excessive hot primary air from being diverted in the hot air cleaning and affecting the normal operation of the primary air fan, the pulverizing system and the combustion system, a primary air measuring device needs to be arranged in the hot air cleaning system to monitor the primary air quantity and feed back the blockage condition of the air preheater by using the primary air quantity.
Because the newly arranged hot air cleaning system has shorter straight pipe section and large shape change difference of the hot air duct, the traditional differential pressure type measuring mode is difficult to accurately measure the air volume, and the flow field change in the air duct is large, thereby causing the prior technical scheme to have larger measuring error, not correctly reflecting the flow velocity in the duct and not providing real-time and accurate air volume guidance for operators.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the first objective of the present invention is to provide a primary air flow measuring device. The device can be used for the anti-blocking cleaning of air heater, can accurately measure the amount of wind once to promote the reliability and the economic nature of flue gas air system operation.
A second object of the present invention is to provide a primary air flow measuring method.
A third object of the present invention is to provide a primary air flow calculation method.
A fourth object of the present invention is to provide a primary air flow calculating device.
In order to achieve the above object, a first aspect of the present invention discloses a primary air flow measuring device, including: the pressure detection assembly comprises a first pressure detection assembly and a second pressure detection assembly, the pressure detection assembly is arranged inside the high-temperature cleaning air branch pipe, the first pressure detection assembly is positioned on the outer side of the high-temperature cleaning air branch pipe elbow, and the second pressure detection assembly is positioned on the inner side of the high-temperature cleaning air branch pipe elbow; and the air quantity detection assembly is connected with the pressure detection assembly to obtain the pressure difference between the outside pressure of the high-temperature cleaning air branch pipe elbow and the inside pressure of the high-temperature cleaning air branch pipe elbow, and primary air flow is calculated according to the pressure difference.
According to the utility model discloses a wind flow measurement device can be used to the air heater and prevent stifled washing, can accurately measure a amount of wind to promote the reliability and the economic nature of flue gas air system operation.
Further, the primary air flow is obtained by the air volume detection assembly through the following formula:
m＝ρvA；
where k is a flow coefficient, Δ P is a differential pressure detected by a pressure measuring type measuring device, Pa, ρ are air densities at a measuring element portion, kg/m3A is the area of the measurement cross section, m2V is the flow velocity, m/s, m is the primary air flow, kg/s.
Further, still include: the current detection assembly is used for detecting the current of the primary fan motor; and the air quantity calculating component is connected with the current detecting component so as to calculate the cleaning air quantity according to the current of the primary fan motor and the current variation of the primary fan motor.
Further, still include: and the prompting component is connected with the air volume detection component and the air volume calculation component respectively so as to prompt according to the difference value of the primary air volume and the cleaning air volume.
A second aspect of the present invention discloses a primary air flow rate measuring method, including: acquiring the outside pressure of the high-temperature cleaning air branch pipe elbow and the inside pressure of the high-temperature cleaning air branch pipe elbow; and obtaining primary air flow according to the pressure difference between the outside pressure of the high-temperature cleaning air branch pipe elbow and the inside pressure of the high-temperature cleaning air branch pipe elbow.
According to the utility model discloses a primary air flow measurement method can be used to the air heater and prevent stifled washing, can accurately measure the amount of wind once to promote the reliability and the economic nature of flue gas air system operation.
Further, the primary air flow is obtained by the air volume detection assembly through the following formula:
m＝ρvA；
where k is a flow coefficient, Δ P is a differential pressure detected by a pressure measuring type measuring device, Pa, ρ are air densities at a measuring element portion, and kg/m3A is the area of the measurement cross section, m2V is the flow velocity, m/s, m is the primary air flow, kg/s.
Further, still include: detecting the current of a primary fan motor; and calculating the cleaning air quantity according to the current of the primary air fan motor and the current variation of the primary air fan motor.
Further, still include: and prompting according to the difference value of the primary air volume and the cleaning air volume.
The third aspect of the utility model discloses a primary air flow calculation method, include: detecting the current of a primary fan motor; obtaining primary air volume variable quantity according to the relation among the total air flow, the air supply flow and the primary air flow of the boiler; and calculating to obtain the primary air flow according to the current of the primary air fan motor and the primary air quantity variable quantity.
According to the utility model discloses a wind flow calculation method can accurately calculate a amount of wind to promote the reliability and the economic nature of cigarette wind system operation.
Further, the primary air volume variation is obtained by the following formula:
wherein, said m0Is the total air flow of the boiler, m1For the primary air flow rate, m2And I is the current of the primary fan motor for the air supply flow.
Further, the primary air flow is calculated by the following formula:
the utility model discloses a fourth aspect discloses an air flow computing device, include: the detection unit is used for detecting the current of the primary fan motor; and the calculation module is connected with the detection unit and used for obtaining primary air volume variable quantity according to the relation among the total air flow, the air supply flow and the primary air flow of the boiler and calculating to obtain the primary air flow according to the current of the primary air fan motor and the primary air volume variable quantity.
According to the utility model discloses a wind flow computing device can accurately calculate a amount of wind to promote the reliability and the economic nature of cigarette wind system operation.
Further, the primary air volume variation is obtained by the following formula:
wherein, said m0Is the total air flow of the boiler, m1For the primary air flow rate, m2And I is the current of the primary fan motor for the air supply flow.
Further, the primary air flow is calculated by the following formula:
additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram of a primary air flow measuring device according to an embodiment of the present invention;
FIG. 2 is a schematic view of a boiler flue gas system according to an embodiment of the present invention;
fig. 3 is an installation schematic diagram of the primary air flow measuring device according to the embodiment of the present invention;
fig. 4 is a flowchart of a primary air flow measuring method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
The primary air flow measuring device and method according to the embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a primary air flow measuring device according to an embodiment of the present invention. As shown in fig. 1, a primary air flow measuring device 100 according to an embodiment of the present invention includes: a pressure detection assembly 110 and an air volume detection assembly 120.
The pressure detection assembly 110 comprises a first pressure detection assembly 111 and a second pressure detection assembly 112, the pressure detection assembly 110 is arranged inside the high-temperature cleaning air branch pipe, the first pressure detection assembly 111 is located on the outer side of the high-temperature cleaning air branch pipe elbow, and the second pressure detection assembly 112 is located on the inner side of the high-temperature cleaning air branch pipe elbow; the air quantity detection component 120 is connected with the pressure detection component 110 to obtain a pressure difference between the outside pressure of the high-temperature cleaning air branch pipe elbow and the inside pressure of the high-temperature cleaning air branch pipe elbow, and a primary air flow is calculated according to the pressure difference.
Specifically, the air volume detecting component 120 obtains the primary air volume by the following formula:
m＝ρvA (2)；
wherein k is the flow rateThe coefficient and Δ P are the differential pressure detected by the pressure measuring device, Pa and ρ are the air density at the measuring element, kg/m3A is the area of the measurement cross section, m2V is the flow velocity, m/s, m is the primary air flow, kg/s.
The measuring device (namely, the primary air flow measuring device) is arranged at the elbow part of the cleaning air duct, the air duct elbow on the cleaning air duct is used for measuring the hot primary air flow, when the hot primary air flow measures the elbow, the pressure difference is generated between the inner part and the outer part of the outer head due to the difference of the flow speed under the action of the flow centrifugal force, and the hot primary air flow is measured by measuring the pressure difference between the inner part and the outer part of the elbow due to the certain functional relation between the pressure difference and the average flow speed in the elbow.
Because of the total air quantity m of the boiler0Is the air delivery m2And the primary air volume m1The air volume measuring devices are respectively arranged on hot secondary air ducts at the outlet of the air preheater for measuring the air volume to obtain the real-time air volume; the primary air quantity is obtained by detecting the mixed hot primary air flow at the inlet of the coal mill and accumulating the sum of the hot primary air flows of all the coal mills to obtain the total primary air quantity, namely:
m0＝m1+m2 (3)；
for the fan, the shaft power is in direct proportion to the product of the volume flow and the full pressure of the fan, and the power of the fan motor is closely related to the shaft power of the fan, and the specific relation is as follows:
wherein: p is the total pressure rise of the fan, Pa; q is the volume flow of the fan, m3/s；η0Is the full pressure efficiency of the fan,%; etamEfficiency of the fan transmission device,%; etaeMotor shaft efficiency,%; u is the motor voltage, V; i is the line current of the motor, A;
is the power of an electric motorA factor.
For equation (4), the logarithm calculation is performed on both sides, and then the full differential solution can be obtained:
for an induced draft fan, a blower and a primary fan configured for a large coal-fired boiler, when the related variables influencing the shaft power of the fan slightly fluctuate at the operating working condition point of the fan in the operation process of the fan, the voltage U and the power factor of a motor
And motor shaft efficiency ηeThe total pressure efficiency eta of the fan is slightly changed or unchanged0Efficiency eta of the fanmSlight variations or invariance occur, so equation (5) can be simplified as:
the utility model discloses with a small amount of hot primary air reposition of redundant personnel, introduce in the little fan-shaped subregion of air heater cold junction setting, be used for scouring and cleaning air heater rotor heat transfer element, hot primary air after the washing gets into hot overgrate air, hot overgrate air after the mixture passes through boiler burner and gets into furnace, it is minimum to original powder process system and combustion system's influence in order to guarantee the operation, it prevents stifled cleaning air system when putting into operation to require air heater, the hot primary air main pipe wind pressure of coal pulverizer entry keeps unchangeable, therefore, to a fan, air heater prevents that the fan total pressure around stifled cleaning air system puts into remains unchanged or takes place small change, can simplify to formula (6):
for the primary hot air, the temperature before and after the working condition changes is basically kept unchanged, and the hot air density can be regarded as a constant, so that the change of the primary hot air quantity can be obtained:
therefore, the hot primary air flow for the anti-blocking cleaning of the air preheater can be indirectly calculated by detecting the relative change value of the current of the primary air fan motor and the hot primary air flow, namely:
through the elbow flowmeter direct measurement who sets up and simplify and deduce the indirect hot primary air flow of measurement of company, can realize the real-time detection and the calibration correction to the air volume of the air heater hot primary air cleaning system who newly adds more directly perceivedly, and then, promote measurement system's reliability and accuracy.
Referring to fig. 2 and 3, wherein 1 is a primary air fan; 2 is a rotary air preheater; 3 is a hot primary air main pipe at the outlet of the air preheater; 4, a cleaning air flow measuring device; 5, high-temperature cleaning air branch pipes; 6, cooling and depressurizing the cleaning air branch pipe; 7 is a primary air flow measuring device for milling; 8 is a pulverizing primary air branch pipe; 9 is a powder making device; 10 is a blower; 11 is an air preheater outlet hot secondary air main pipe; 12 is a hot secondary air flow measuring device; 13 is a combustion secondary air main pipe; 14 is a main burner; 15 is an over-fire air burner; 16 is a dust removing device; 17 is a draught fan; 18 is an air quantity measuring section; 19 is a negative pressure side sampling point; 20 is a positive pressure side sampling point.
Air passes through a primary air fan 1 and a blower 10 for pressurization and then passes through a rotary air preheater 2, a high-temperature cleaning air branch pipe 5 is connected out of a hot primary air main pipe 3 at the outlet of the air preheater, a primary air powder making flow measuring device 7 is arranged on a hot primary air inlet primary air branch pipe 8, and a cleaning air flow measuring device 4 is arranged on the high-temperature cleaning air branch pipe 5The air quantity measured by the primary air flow measuring device 7 for pulverizing is m1kg/s; a hot secondary air flow measuring device 12 is arranged on a hot secondary air main pipe 11 at the outlet of the air preheater, and can detect the air quantity fed into a boiler combustion secondary air main pipe 13, and the value of the air quantity is m2kg/s, total air volume entering the hearth main burner 14 and the over fire air burner 15 is (m)1+m2)kg/s。
Flue gas at the outlet of the SCR denitration reactor enters a rotary air preheater 2, primary air and air are exchanged by heat, and the flue gas with the reduced temperature sequentially passes through a dust removal device 16 and an induced draft fan 17 and then enters a tail flue gas purification device. Partial hot primary air which is shunted from the hot primary air main pipe 3 at the outlet of the air preheater enters the cold end of the air preheater through the small fan-shaped partition, the heat exchange element of the air preheater is locally heated, and the decomposition and the scouring of ammonium bisulfate on the surface of the air preheater are realized after the metal temperature is raised, so that the aim of cleaning the rotor of the air preheater on line is fulfilled. Cleaning air passes through the air preheater and then is converged with a hot secondary air main pipe 11 at the outlet of the air preheater through a cleaning air branch pipe 6 after temperature and pressure reduction, and enters a hot secondary air flow measuring device 12.
The utility model discloses an embodiment, a wind flow measurement device, its characterized in that still includes: the current detection assembly is used for detecting the current of the primary fan motor; and the air quantity calculating component is connected with the current detecting component so as to calculate the cleaning air quantity according to the current of the primary fan motor and the current variation of the primary fan motor. Specifically, the cleaning air flow can be measured in real time by the cleaning air flow measuring device 4 during operation, and the formula m is calculated according to the current change delta I of the primary air fan motor and the change of the original current I1Δ I/I can indirectly calculate the cleaning air flow, calculate the air quantity and measure the air quantity and compare, realize the automatic calibration of the air quantity, thereby achieving the real-time monitoring and evaluation of the hot primary air flow of the anti-blocking cleaning air system, namely: the method can also comprise the following steps: and the prompting component is connected with the air volume detection component and the air volume calculation component respectively so as to prompt according to the difference value of the primary air volume and the cleaning air volume. And then toThe reliability and the economy of the operation of the smoke and air system are improved.
Through the embodiment of the utility model, (1) the limited flue arrangement space can be fully utilized, the elbow is adopted to measure the air quantity, the hot primary air flow of the anti-blocking cleaning system of the air preheater is visually displayed, the arrangement form of the air quantity measuring system is simplified, and the cost is saved; (2) calculating the change of the outlet air quantity of the primary fan by using the measured values of the total air quantity and the air supply quantity of the boiler and the change of the motor current of the primary fan, thereby indirectly measuring the hot primary air flow for the anti-blocking cleaning system of the air preheater; (3) the indirect measurement of a theoretical calculation formula is deduced according to the direct measurement and the physical mathematical equation of the air volume measuring device arranged on the system, so that the comparison and calibration of the hot primary air flow of the anti-blockage cleaning system of the air preheater can be carried out in real time, and the reliability and the accuracy of the air volume measurement are improved; (4) the technical problem of newly increasing system air quantity measurement after the boiler is transformed is solved; and (5) providing a technical shortcut for evaluating the effect of the anti-blocking cleaning system of the air preheater and demonstrating the influence on the whole system of the boiler.
According to the utility model discloses a wind flow measurement device can be used to air heater and prevent stifled washing, can accurately measure the amount of wind once to promote the reliability and the economic nature of flue gas air system operation.
As shown in fig. 4, the embodiment of the utility model discloses a primary air flow measuring method, include:
s401: acquiring the outside pressure of the high-temperature cleaning air branch pipe elbow and the inside pressure of the high-temperature cleaning air branch pipe elbow;
s402: and obtaining primary air flow according to the pressure difference between the outside pressure of the high-temperature cleaning air branch pipe elbow and the inside pressure of the high-temperature cleaning air branch pipe elbow.
Further, the primary air flow is obtained by the air volume detection assembly through the following formula:
m＝ρvA；
where k is a flow coefficient, Δ P is a differential pressure detected by a pressure measuring type measuring device, Pa, ρ are air densities at a measuring element portion, kg/m3A is the area of the measurement cross section, m2V is the flow velocity, m/s, m is the primary air flow, kg/s.
Further, still include: detecting the current of a primary fan motor; and calculating the cleaning air quantity according to the current of the primary air fan motor and the current variation of the primary air fan motor.
Further, still include: and prompting according to the difference value of the primary air volume and the cleaning air volume.
According to the utility model discloses a primary air flow measurement method can be used to the anti-blocking washing of air heater, can accurately measure a amount of wind to promote the reliability and the economic nature of flue gas air system operation.
It should be noted that the specific implementation manner of the primary air flow measurement method according to the embodiment of the present invention is similar to the specific implementation manner of the primary air flow measurement device according to the embodiment of the present invention, and please refer to the description of the device part specifically, which is not repeated herein.
Further, the embodiment of the utility model also discloses a wind flow calculation method once, include: detecting the current of a primary fan motor; obtaining primary air volume variable quantity according to the relation among the total air flow, the air supply flow and the primary air flow of the boiler; and calculating to obtain the primary air flow according to the current of the primary air fan motor and the primary air quantity variable quantity.
According to the utility model discloses a once wind flow calculation method can be used to the stifled washing of air heater anti-clogging to accurately calculate once amount of wind to promote the reliability and the economic nature of cigarette wind system operation.
Further, the primary air volume variation is obtained by the following formula:
wherein, said m0Is the total air flow of the boiler, m1For the primary air flow rate, m2And I is the current of the primary fan motor for the air supply flow.
Further, the primary air flow is calculated by the following formula:
furthermore, the embodiment of the utility model discloses an air flow computing device is still disclosed, include: the detection unit is used for detecting the current of the primary fan motor; and the calculation module is connected with the detection unit and used for obtaining primary air volume variable quantity according to the relation among the total air flow, the air supply flow and the primary air flow of the boiler and calculating to obtain the primary air flow according to the current of the primary air fan motor and the primary air volume variable quantity.
According to the utility model discloses a wind flow computing device can be used to air heater and prevent stifled washing, can accurately calculate a amount of wind to promote the reliability and the economic nature of flue gas air system operation.
Further, the primary air volume variation is obtained by the following formula:
wherein, said m0Is the total air flow of the boiler, m1For the primary air flow rate, m2And I is the current of the primary fan motor for the air supply flow.
Further, the primary air flow is calculated by the following formula:
it should be noted that the specific implementation manner of the primary air flow calculating device in the embodiment of the present invention is similar to the specific implementation manner of the primary air flow calculating method in the embodiment of the present invention, and please refer to the description of the method part specifically, which is not described herein again.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through an intermediate medium, and the specific meanings of the terms as described above will be understood by those skilled in the art according to the specific situation.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (7)
1. A primary air flow measurement device, comprising:
the pressure detection assembly comprises a first pressure detection assembly and a second pressure detection assembly, the pressure detection assembly is arranged inside the high-temperature cleaning air branch pipe, the first pressure detection assembly is positioned on the outer side of the high-temperature cleaning air branch pipe elbow, and the second pressure detection assembly is positioned on the inner side of the high-temperature cleaning air branch pipe elbow;
and the air quantity detection assembly is connected with the pressure detection assembly to obtain the pressure difference between the outside pressure of the high-temperature cleaning air branch pipe elbow and the inside pressure of the high-temperature cleaning air branch pipe elbow, and primary air flow is calculated according to the pressure difference.
2. The primary air flow measuring device according to claim 1, wherein the air volume detecting component obtains the primary air flow by the following formula:
m＝ρvA；
where k is a flow coefficient, Δ P is a differential pressure detected by a pressure measuring type measuring device, Pa, ρ are air densities at a measuring element portion, kg/m3A is the area of the measurement cross section, m2V is the flow velocity, m/s, m is the primary air flow, kg/s.
3. The primary air flow measurement device of claim 1, further comprising:
the current detection assembly is used for detecting the current of the primary fan motor;
and the air quantity calculating component is connected with the current detecting component so as to calculate the cleaning air quantity according to the current of the primary fan motor and the current variation of the primary fan motor.
4. The primary air flow measurement device of claim 3, further comprising:
and the prompting component is connected with the air volume detection component and the air volume calculation component respectively so as to prompt according to the difference value of the primary air volume and the cleaning air volume.
5. A primary air flow calculation device, comprising:
the detection unit is used for detecting the current of the primary fan motor;
and the calculation module is connected with the detection unit and used for obtaining primary air volume variable quantity according to the relation among the total air flow, the air supply flow and the primary air flow of the boiler and calculating to obtain the primary air flow according to the current of the primary air fan motor and the primary air volume variable quantity.
6. The primary air flow calculating device according to claim 5, wherein the primary air volume change amount is obtained by the following formula:
wherein, said m0Is the total air flow of the boiler, m1For the primary air flow rate, m2And I is the current of the primary fan motor for the air supply flow.
7. The primary air flow calculation device of claim 5, wherein the primary air flow is calculated by the following formula:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113847835A (en) * | 2021-08-05 | 2021-12-28 | 凯迈（洛阳）测控有限公司 | Revolving body flow dividing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113847835A (en) * | 2021-08-05 | 2021-12-28 | 凯迈（洛阳）测控有限公司 | Revolving body flow dividing device |
| CN113847835B (en) * | 2021-08-05 | 2023-08-18 | 凯迈（洛阳）测控有限公司 | Revolving body flow dividing device |
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