CN117536914A - Induced draft fan control method and system - Google Patents
Induced draft fan control method and system Download PDFInfo
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- CN117536914A CN117536914A CN202311761188.7A CN202311761188A CN117536914A CN 117536914 A CN117536914 A CN 117536914A CN 202311761188 A CN202311761188 A CN 202311761188A CN 117536914 A CN117536914 A CN 117536914A
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- induced draft
- draft fan
- wind pressure
- preset value
- value
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 59
- 239000007789 gas Substances 0.000 claims description 69
- 239000002737 fuel gas Substances 0.000 claims description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- 239000003546 flue gas Substances 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a draught fan control method and a draught fan control system, wherein the method comprises the following steps: determining target wind pressure P of induced draft fan i The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the actual wind pressure p of the induced draft fan; the actual wind pressure P and the target wind pressure P of the induced draft fan i And carrying out difference operation to obtain a wind pressure deviation value delta P, wherein a specific calculation formula is as follows: Δp=p-P i The method comprises the steps of carrying out a first treatment on the surface of the And correspondingly adjusting the rotating speed of the induced draft fan according to the wind pressure deviation value delta P. The invention solves the problems that the induced draft fan in the existing gas product is provided with a fixed gear, is difficult to automatically adjust, and can not timely adjust the normal air quantity when the air quantity of the induced draft fan changes due to abnormal conditions, so that incomplete combustion of the gas in the gas product can occur, and the life safety of a user is endangered.
Description
Technical Field
The invention relates to the technical field of induced draft fan control, in particular to a method and a system for controlling an induced draft fan.
Background
In the actual use process, the induced draft fan can meet abnormal conditions, for example, the induced draft fan is influenced by external factors such as air duct resistance, power supply voltage fluctuation and the like, so that the air quantity of the induced draft fan is changed. Because the draught fan in the existing gas product is provided with fixed gears, the rotating speed corresponding to each gear is fixed, automatic adjustment is difficult, when the air quantity of the draught fan changes due to abnormal conditions of the draught fan, the normal air quantity cannot be timely adjusted, incomplete combustion of gas in the gas product can possibly occur, carbon monoxide is generated, and the life safety of a user is endangered.
Disclosure of Invention
Aiming at the defects, the invention provides a draught fan control method and system, and aims to solve the problems that an induced draft fan in the existing gas product is provided with a fixed gear, automatic adjustment is difficult, when the air quantity of the induced draft fan changes due to abnormal conditions, the normal air quantity cannot be adjusted in time, incomplete combustion of gas in the gas product possibly occurs, and the life safety of a user is endangered.
To achieve the purpose, the invention adopts the following technical scheme:
a draught fan control method comprises the following steps:
step S1: determining target wind pressure P of induced draft fan i ；
Step S2: acquiring the actual wind pressure p of the induced draft fan;
step S3: the actual wind pressure P and the target wind pressure P of the induced draft fan i And carrying out difference operation to obtain a wind pressure deviation value delta P, wherein a specific calculation formula is as follows:
ΔP＝p-P i ；
step S4: correspondingly adjusting the rotating speed of the induced draft fan according to the wind pressure deviation value delta P; when the wind pressure deviation value delta P is larger than a first preset value and smaller than or equal to a second preset value, subtracting a first rotation adjustment value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than the second preset value and smaller than or equal to the third preset value, subtracting a second rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than a third preset value, subtracting a third rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than or equal to a fifth preset value and smaller than a fourth preset value, increasing the rotating speed of the current induced draft fan by a first rotating speed adjustment value; when the wind pressure deviation value delta P is larger than or equal to a sixth preset value and smaller than a fifth preset value, the rotating speed of the current induced draft fan is increased by a second rotating speed adjusting value; when the wind pressure deviation value delta P is smaller than a sixth preset value, the rotating speed of the current induced draft fan is increased by a third rotating speed adjusting value, wherein the first preset value, the second preset value and the third preset value are all positive numbers, and the fourth preset value, the fifth preset value and the sixth preset value are all negative numbers.
Preferably, in step S1, the following steps are specifically included:
step S11: calculating the theoretical air quantity required by the application of gas combustion according to the fuel combustion theory;
step S12: determining an excess air coefficient of the applied fuel gas;
step S13: according to the theoretical air quantity required by the application gas combustion and the excess air coefficient of the application gas, the actual air quantity required by the application gas combustion is calculated, and a specific calculation formula is as follows:
V’＝V 0 *α；
wherein V' represents the actual air amount required for combustion of the applied gas, V 0 Represents the theoretical air quantity required by the combustion of the application gas, and alpha represents the excess air coefficient of the application gas;
step S14: according to the volume of the applied fuel gas and the actual air quantity required by the combustion of the applied fuel gas, the volume of the flue gas generated by the complete combustion of the applied fuel gas, namely the air quantity required by the induced draft fan, is calculated;
step S15: and determining the target wind pressure of the induced draft fan according to the required wind quantity of the induced draft fan and the Q-P wind pressure curve function of the induced draft fan.
More preferably, in step S15, the specific expression of the Q-P wind pressure curve function of the induced draft fan is as follows:
Q i ＝0.0964P i +1.8766；
wherein Q is i Represents the air quantity required by the induced draft fan, P i And the target wind pressure of the induced draft fan is shown.
Another aspect of the present application provides a draught fan control system, the system comprising:
a determining module for determining target wind pressure P of induced draft fan i ；
The acquisition module is used for acquiring the actual wind pressure p of the induced draft fan;
the calculation module is used for calculating the actual wind pressure P and the target wind pressure P of the induced draft fan i And carrying out difference operation to obtain a wind pressure deviation value delta P, wherein a specific calculation formula is as follows:
ΔP＝p-P i ；
the adjusting module is used for correspondingly adjusting the rotating speed of the induced draft fan according to the wind pressure deviation value delta P; when the wind pressure deviation value delta P is larger than a first preset value and smaller than or equal to a second preset value, subtracting a first rotation adjustment value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than the second preset value and smaller than or equal to the third preset value, subtracting a second rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than a third preset value, subtracting a third rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than or equal to a fifth preset value and smaller than a fourth preset value, increasing the rotating speed of the current induced draft fan by a first rotating speed adjustment value; when the wind pressure deviation value delta P is larger than or equal to a sixth preset value and smaller than a fifth preset value, the rotating speed of the current induced draft fan is increased by a second rotating speed adjusting value; when the wind pressure deviation value delta P is smaller than a sixth preset value, the rotating speed of the current induced draft fan is increased by a third rotating speed adjusting value, wherein the first preset value, the second preset value and the third preset value are all positive numbers, and the fourth preset value, the fifth preset value and the sixth preset value are all negative numbers.
Preferably, the determining module includes:
a first calculation sub-module for calculating a theoretical air amount required for applying the gas combustion according to the fuel combustion theory;
a first determination submodule for determining an excess air coefficient of the applied fuel gas;
the second calculation sub-module is used for calculating the actual air quantity required by the application gas combustion according to the theoretical air quantity required by the application gas combustion and the excess air coefficient of the application gas, and a specific calculation formula is as follows:
V’＝V 0 *α；
wherein V' represents the actual air amount required for combustion of the applied gas, V 0 Represents the theoretical air quantity required by the combustion of the application gas, and alpha represents the excess air coefficient of the application gas;
the third calculation sub-module is used for calculating and obtaining the volume of the flue gas generated by the complete combustion of the application gas, namely the air quantity required by the induced draft fan according to the volume of the application gas and the actual air quantity required by the combustion of the application gas;
and the second determining submodule is used for determining the target wind pressure of the induced draft fan according to the wind quantity required by the induced draft fan and the Q-P wind pressure curve function of the induced draft fan.
Preferably, in the second determining submodule, a specific expression of the Q-P wind pressure curve function of the induced draft fan is as follows:
Q i ＝0.0964P i +1.8766；
wherein Q is i Represents the air quantity required by the induced draft fan, P i And the target wind pressure of the induced draft fan is shown.
The technical scheme provided by the embodiment of the application can comprise the following beneficial effects:
according to the scheme, the wind pressure sensor is arranged on the induced draft fan in the gas product, the actual wind pressure of the induced draft fan can be monitored in real time, the actual wind pressure of the induced draft fan is compared with the current set target wind pressure to obtain the wind pressure deviation value, and according to the wind pressure deviation value, when the wind quantity of the induced draft fan changes due to abnormal conditions of the induced draft fan, the rotating speed of the induced draft fan can be automatically adjusted to keep the wind quantity of the induced draft fan constant, incomplete gas combustion in the gas product is avoided, and the life safety of a user is protected.
Drawings
Fig. 1 is a flow chart of steps of a method for controlling an induced draft fan.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
A draught fan control method comprises the following steps:
step S1: determining target wind pressure P of induced draft fan i ；
Step S2: acquiring the actual wind pressure p of the induced draft fan;
step S3: the actual wind pressure P and the target wind pressure P of the induced draft fan i And carrying out difference operation to obtain a wind pressure deviation value delta P, wherein a specific calculation formula is as follows:
ΔP＝p-P i ；
step S4: correspondingly adjusting the rotating speed of the induced draft fan according to the wind pressure deviation value delta P; when the wind pressure deviation value delta P is larger than a first preset value and smaller than or equal to a second preset value, subtracting a first rotation adjustment value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than the second preset value and smaller than or equal to the third preset value, subtracting a second rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than a third preset value, subtracting a third rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than or equal to a fifth preset value and smaller than a fourth preset value, increasing the rotating speed of the current induced draft fan by a first rotating speed adjustment value; when the wind pressure deviation value delta P is larger than or equal to a sixth preset value and smaller than a fifth preset value, the rotating speed of the current induced draft fan is increased by a second rotating speed adjusting value; when the wind pressure deviation value delta P is smaller than a sixth preset value, the rotating speed of the current induced draft fan is increased by a third rotating speed adjusting value, wherein the first preset value, the second preset value and the third preset value are all positive numbers, and the fourth preset value, the fifth preset value and the sixth preset value are all negative numbers.
In the method for controlling the induced draft fan, as shown in fig. 1, a first step is to determine a target wind pressure P of the induced draft fan i In the embodiment, the induced draft fan in the gas product is provided with two working modes, one is a fixed mode, and in the fixed mode, the induced draft fan operates according to the rotating speed corresponding to each fixed gear; the other is a stepless mode, namely no fixed gas load in a certain range, in which the air quantity Q required by the induced draft fan can be determined i Determining target wind pressure P of the induced draft fan by using Q-P wind pressure curve function of the induced draft fan i . The second step is to obtain the actual wind pressure p of the induced draft fan, in this embodiment, the induced draft fan in the gas product is provided with a wind pressure sensor, and the wind pressure in the induced draft fan wind channel can be monitored in real time through the wind pressure sensor.The third step is to combine the actual wind pressure P and target wind pressure P of the induced draft fan i And carrying out difference operation to obtain a wind pressure deviation value delta P, wherein a specific calculation formula is as follows: Δp=p-P i In this embodiment, the actual wind pressure P and the target wind pressure P of the induced draft fan are calculated i Is beneficial to the adjustment of the rotation speed of the subsequent induced draft fan. The fourth step is to correspondingly adjust the rotation speed of the induced draft fan according to the wind pressure deviation value delta P; when the wind pressure deviation value delta P is larger than a first preset value and smaller than or equal to a second preset value, subtracting a first rotation adjustment value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than the second preset value and smaller than or equal to the third preset value, subtracting a second rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than a third preset value, subtracting a third rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than or equal to a fifth preset value and smaller than a fourth preset value, increasing the rotating speed of the current induced draft fan by a first rotating speed adjustment value; when the wind pressure deviation value delta P is larger than or equal to a sixth preset value and smaller than a fifth preset value, the rotating speed of the current induced draft fan is increased by a second rotating speed adjusting value; when the wind pressure deviation value Δp is smaller than a sixth preset value, the rotation speed of the current induced draft fan is increased by a third rotation speed adjustment value, wherein the first preset value, the second preset value and the third preset value are positive numbers, the fourth preset value, the fifth preset value and the sixth preset value are negative numbers, in the embodiment, the first preset value is 5Pa, the second preset value is 20Pa, the third preset value is 50Pa, the fourth preset value is-5 Pa, the fifth preset value is-20 Pa, the sixth preset value is-50 Pa, the first rotation speed adjustment value is 20r/min, the second rotation speed adjustment value is 50r/min, and the third rotation speed adjustment value is 100r/min. When delta P is less than or equal to minus 5 and less than or equal to 5, the actual wind pressure is close to the target wind pressure, and the rotating speed of the induced draft fan is not adjusted; when 5<When delta P is less than or equal to 20, the actual wind pressure is higher than the target wind pressure, the deviation degree is not large, the rotating speed of the induced draft fan is reduced by 20r/min, so that the excessive adjustment of the rotating speed is prevented, and delta P can appear after skipping the head<-5Pa, the problem that the back and forth adjustment cannot reach the target wind pressure occurs; when 20 is<ΔP is less than or equal to 50, which indicates that the actual wind pressure is higher than the target wind pressure, the deviation degree is general, and the rotating speed of the induced draft fan is reduced by 50r/min; when (when)ΔP>50, indicating that the actual wind pressure is higher than the target wind pressure, the deviation degree is larger, in order to make the actual pressure approach the target pressure as soon as possible, the adjusting speed is increased, 100r/min is reduced, a certain time is required after 100r/min is reduced, delta P is calculated again, at this time, the value of delta P is smaller than 50Pa, and then the adjusting amplitude is slowly reduced until delta P<5Pa. Similarly, when-20 is less than or equal to DeltaP<-5, when the actual wind pressure is lower than the target wind pressure, the deviation degree is not large, the rotating speed of the induced draft fan is increased by 20r/min, and when-50 is less than or equal to delta P<When the wind pressure is 20, the actual wind pressure is lower than the target wind pressure, the deviation degree is general, the rotating speed of the induced draft fan is increased by 50r/min, and when delta P<And 50, namely, the actual wind pressure is lower than the target wind pressure, the deviation degree is larger, and the rotating speed of the induced draft fan is increased by 100r/min. When the air quantity of the induced draft fan is changed due to abnormal conditions of the induced draft fan, the rotating speed of the induced draft fan can be automatically adjusted to keep the air quantity of the induced draft fan constant, incomplete combustion of gas in gas products is avoided, and life safety of users is protected.
Preferably, in step S1, the method specifically includes the following steps:
step S11: calculating the theoretical air quantity required by the application of gas combustion according to the fuel combustion theory;
step S12: determining an excess air coefficient of the applied fuel gas;
step S13: according to the theoretical air quantity required by the application gas combustion and the excess air coefficient of the application gas, the actual air quantity required by the application gas combustion is calculated, and a specific calculation formula is as follows:
V’＝V 0 *α；
wherein V' represents the actual air amount required for combustion of the applied gas, V 0 Represents the theoretical air quantity required by the combustion of the application gas, and alpha represents the excess air coefficient of the application gas;
step S14: according to the volume of the applied fuel gas and the actual air quantity required by the combustion of the applied fuel gas, the volume of the flue gas generated by the complete combustion of the applied fuel gas, namely the air quantity required by the induced draft fan, is calculated;
step S15: and determining the target wind pressure of the induced draft fan according to the required wind quantity of the induced draft fan and the Q-P wind pressure curve function of the induced draft fan.
In this embodiment, the gas is methane, and 1m is known from the chemical equation of methane combustion 3 Complete combustion of methane per unit volume theoretically consumes 2 times the unit volume of oxygen O 2 Producing 1 time of carbon dioxide CO 2 And 2 times the unit volume of water vapor H 2 O, while oxygen in the atmosphere O 2 Is 21% of the ratio of nitrogen N 2 The duty cycle was 79%. Thus, the theoretical air quantity V required for combustion of methane of volume V 0 When the ratio of 2V/21% =9.52V and the excess air coefficient of methane is α, the actual air quantity V' required by the gas combustion is 9.52v×α, and the volume of flue gas generated by the gas complete combustion is appliedI.e. V flue When v+v' +79++2v= (1.79+9.52α) v+2v, the air volume Q required by the induced draft fan i Is V (V) flue And then according to the Q-P wind pressure curve function of the induced draft fan, the target wind pressure of the corresponding induced draft fan can be calculated.
More preferably, in step S15, the specific expression of the Q-P wind pressure curve function of the induced draft fan is as follows:
Q i ＝0.0964P i +1.8766；
wherein Q is i Represents the air quantity required by the induced draft fan, P i And the target wind pressure of the induced draft fan is shown.
In this embodiment, the relationship between the air volume and the air pressure of the induced draft fan can be clearly understood through the Q-P air pressure curve function of the induced draft fan, so that the target air pressure of the induced draft fan can be conveniently and further obtained.
Another aspect of the present application provides a draught fan control system, the system comprising:
a determining module for determining target wind pressure P of induced draft fan i ；
The acquisition module is used for acquiring the actual wind pressure p of the induced draft fan;
the calculation module is used for calculating the actual wind pressure P and the target wind pressure P of the induced draft fan i Performing a difference operation to obtain a wind pressure deviation value DeltaPThe specific calculation formula is as follows:
ΔP＝p-P i ；
the adjusting module is used for correspondingly adjusting the rotating speed of the induced draft fan according to the wind pressure deviation value delta P; when the wind pressure deviation value delta P is larger than a first preset value and smaller than or equal to a second preset value, subtracting a first rotation adjustment value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than the second preset value and smaller than or equal to the third preset value, subtracting a second rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than a third preset value, subtracting a third rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than or equal to a fifth preset value and smaller than a fourth preset value, increasing the rotating speed of the current induced draft fan by a first rotating speed adjustment value; when the wind pressure deviation value delta P is larger than or equal to a sixth preset value and smaller than a fifth preset value, the rotating speed of the current induced draft fan is increased by a second rotating speed adjusting value; when the wind pressure deviation value delta P is smaller than a sixth preset value, the rotating speed of the current induced draft fan is increased by a third rotating speed adjusting value, wherein the first preset value, the second preset value and the third preset value are all positive numbers, and the fourth preset value, the fifth preset value and the sixth preset value are all negative numbers.
According to the draught fan control system, through the mutual matching of the determining module, the acquiring module, the calculating module and the adjusting module, when the air quantity of the draught fan changes due to abnormal conditions of the draught fan, the rotating speed of the draught fan can be automatically adjusted to enable the air quantity of the draught fan to be kept constant, incomplete combustion of gas in a gas product is avoided, and life safety of a user is protected.
Preferably, the determining module includes:
a first calculation sub-module for calculating a theoretical air amount required for applying the gas combustion according to the fuel combustion theory;
a first determination submodule for determining an excess air coefficient of the applied fuel gas;
the second calculation sub-module is used for calculating the actual air quantity required by the application gas combustion according to the theoretical air quantity required by the application gas combustion and the excess air coefficient of the application gas, and a specific calculation formula is as follows:
V’＝V 0 *α；
wherein V' represents the actual air amount required for combustion of the applied gas, V 0 Represents the theoretical air quantity required by the combustion of the application gas, and alpha represents the excess air coefficient of the application gas;
the third calculation sub-module is used for calculating and obtaining the volume of the flue gas generated by the complete combustion of the application gas, namely the air quantity required by the induced draft fan according to the volume of the application gas and the actual air quantity required by the combustion of the application gas;
and the second determining submodule is used for determining the target wind pressure of the induced draft fan according to the wind quantity required by the induced draft fan and the Q-P wind pressure curve function of the induced draft fan.
In this embodiment, the first calculation sub-module, the first determination sub-module, the second calculation sub-module, the third calculation sub-module and the second determination sub-module are mutually matched, so that the determination of the target wind pressure of the induced draft fan is realized.
More preferably, in the second determining submodule, the specific expression of the Q-P wind pressure curve function of the induced draft fan is as follows:
Q i ＝0.0964P i +1.8766；
wherein Q is i Represents the air quantity required by the induced draft fan, P i And the target wind pressure of the induced draft fan is shown.
In this embodiment, the relationship between the air volume and the air pressure of the induced draft fan can be clearly understood through the Q-P air pressure curve function of the induced draft fan, so that the target air pressure of the induced draft fan can be conveniently and further obtained.
Furthermore, functional units in various embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations of the above embodiments may be made by those skilled in the art within the scope of the invention.
Claims (6)
1. A draught fan control method is characterized in that: the method comprises the following steps:
step S1: determining target wind pressure P of induced draft fan i ；
Step S2: acquiring the actual wind pressure p of the induced draft fan;
step S3: the actual wind pressure P and the target wind pressure P of the induced draft fan i And carrying out difference operation to obtain a wind pressure deviation value delta P, wherein a specific calculation formula is as follows:
ΔP＝p-P i ；
step S4: correspondingly adjusting the rotating speed of the induced draft fan according to the wind pressure deviation value delta P; when the wind pressure deviation value delta P is larger than a first preset value and smaller than or equal to a second preset value, subtracting a first rotation adjustment value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than the second preset value and smaller than or equal to the third preset value, subtracting a second rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than a third preset value, subtracting a third rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than or equal to a fifth preset value and smaller than a fourth preset value, increasing the rotating speed of the current induced draft fan by a first rotating speed adjustment value; when the wind pressure deviation value delta P is larger than or equal to a sixth preset value and smaller than a fifth preset value, the rotating speed of the current induced draft fan is increased by a second rotating speed adjusting value; when the wind pressure deviation value delta P is smaller than a sixth preset value, the rotating speed of the current induced draft fan is increased by a third rotating speed adjusting value, wherein the first preset value, the second preset value and the third preset value are all positive numbers, and the fourth preset value, the fifth preset value and the sixth preset value are all negative numbers.
2. The induced draft fan control method according to claim 1, wherein: in step S1, the method specifically includes the following steps:
step S11: calculating the theoretical air quantity required by the application of gas combustion according to the fuel combustion theory;
step S12: determining an excess air coefficient of the applied fuel gas;
step S13: according to the theoretical air quantity required by the application gas combustion and the excess air coefficient of the application gas, the actual air quantity required by the application gas combustion is calculated, and a specific calculation formula is as follows:
V’＝V 0 *α；
wherein V' represents the actual air amount required for combustion of the applied gas, V 0 Represents the theoretical air quantity required by the combustion of the application gas, and alpha represents the excess air coefficient of the application gas;
step S14: according to the volume of the applied fuel gas and the actual air quantity required by the combustion of the applied fuel gas, the volume of the flue gas generated by the complete combustion of the applied fuel gas, namely the air quantity required by the induced draft fan, is calculated;
step S15: and determining the target wind pressure of the induced draft fan according to the required wind quantity of the induced draft fan and the Q-P wind pressure curve function of the induced draft fan.
3. The induced draft fan control method according to claim 2, wherein: in step S15, the specific expression of the Q-P wind pressure curve function of the induced draft fan is as follows:
Q i ＝0.0964P i +1.8766；
wherein Q is i Represents the air quantity required by the induced draft fan, P i And the target wind pressure of the induced draft fan is shown.
4. An induced draft fan control system, its characterized in that: use of the induced draft fan control method according to any one of claims 1 to 3, said system comprising:
a determining module for determining target wind pressure P of induced draft fan i ；
The acquisition module is used for acquiring the actual wind pressure p of the induced draft fan;
the calculation module is used for calculating the actual wind pressure P and the target wind pressure P of the induced draft fan i And carrying out difference operation to obtain a wind pressure deviation value delta P, wherein a specific calculation formula is as follows:
ΔP＝p-P i ；
the adjusting module is used for correspondingly adjusting the rotating speed of the induced draft fan according to the wind pressure deviation value delta P; when the wind pressure deviation value delta P is larger than a first preset value and smaller than or equal to a second preset value, subtracting a first rotation adjustment value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than the second preset value and smaller than or equal to the third preset value, subtracting a second rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than a third preset value, subtracting a third rotation speed adjusting value from the rotation speed of the current induced draft fan; when the wind pressure deviation value delta P is larger than or equal to a fifth preset value and smaller than a fourth preset value, increasing the rotating speed of the current induced draft fan by a first rotating speed adjustment value; when the wind pressure deviation value delta P is larger than or equal to a sixth preset value and smaller than a fifth preset value, the rotating speed of the current induced draft fan is increased by a second rotating speed adjusting value; when the wind pressure deviation value delta P is smaller than a sixth preset value, the rotating speed of the current induced draft fan is increased by a third rotating speed adjusting value, wherein the first preset value, the second preset value and the third preset value are all positive numbers, and the fourth preset value, the fifth preset value and the sixth preset value are all negative numbers.
5. The induced draft fan control system according to claim 4, wherein: the determining module includes:
a first calculation sub-module for calculating a theoretical air amount required for applying the gas combustion according to the fuel combustion theory;
a first determination submodule for determining an excess air coefficient of the applied fuel gas;
the second calculation sub-module is used for calculating the actual air quantity required by the application gas combustion according to the theoretical air quantity required by the application gas combustion and the excess air coefficient of the application gas, and a specific calculation formula is as follows:
V’＝V 0 *α；
wherein V' represents an applicationThe actual air quantity required by the combustion of the fuel gas, V 0 Represents the theoretical air quantity required by the combustion of the application gas, and alpha represents the excess air coefficient of the application gas;
the third calculation sub-module is used for calculating and obtaining the volume of the flue gas generated by the complete combustion of the application gas, namely the air quantity required by the induced draft fan according to the volume of the application gas and the actual air quantity required by the combustion of the application gas;
and the second determining submodule is used for determining the target wind pressure of the induced draft fan according to the wind quantity required by the induced draft fan and the Q-P wind pressure curve function of the induced draft fan.
6. The induced draft fan control system according to claim 5, wherein: in the second determining submodule, the specific expression of the Q-P wind pressure curve function of the induced draft fan is as follows:
Q i ＝0.0964P i +1.8766；
wherein Q is i Represents the air quantity required by the induced draft fan, P i And the target wind pressure of the induced draft fan is shown.
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| CN107781957A (en) * | 2017-11-02 | 2018-03-09 | 广东美的制冷设备有限公司 | Constant air capacity control, air conditioner and the computer-readable recording medium of air conditioner |
| CN109945503A (en) * | 2019-02-21 | 2019-06-28 | 广东万和热能科技有限公司 | Air quantity control method, device, storage medium and the gas utensil of gas utensil |
| CN110307651A (en) * | 2019-06-04 | 2019-10-08 | 广东万和新电气股份有限公司 | The control method and control system of gas heater |
| CN112240579A (en) * | 2019-07-17 | 2021-01-19 | 青岛海尔智能技术研发有限公司 | Range hood and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107781957A (en) * | 2017-11-02 | 2018-03-09 | 广东美的制冷设备有限公司 | Constant air capacity control, air conditioner and the computer-readable recording medium of air conditioner |
| CN109945503A (en) * | 2019-02-21 | 2019-06-28 | 广东万和热能科技有限公司 | Air quantity control method, device, storage medium and the gas utensil of gas utensil |
| CN110307651A (en) * | 2019-06-04 | 2019-10-08 | 广东万和新电气股份有限公司 | The control method and control system of gas heater |
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