CN112137151A - Accurate frequency conversion intelligent control method of tobacco curing barn circulating fan based on air pressure difference - Google Patents
Accurate frequency conversion intelligent control method of tobacco curing barn circulating fan based on air pressure difference Download PDFInfo
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- CN112137151A CN112137151A CN202011142070.2A CN202011142070A CN112137151A CN 112137151 A CN112137151 A CN 112137151A CN 202011142070 A CN202011142070 A CN 202011142070A CN 112137151 A CN112137151 A CN 112137151A
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/10—Roasting or cooling tobacco
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Abstract
The invention belongs to the technical field of tobacco leaf curing barn, and particularly relates to an accurate frequency conversion intelligent control method of a tobacco leaf curing barn circulating fan based on air pressure difference, which comprises the following steps: setting different baking temperature sections, setting the circulating background frequency of a fan of each baking temperature section, and setting a target air pressure difference on the basis; the control system is operated based on the set baking temperature section and the background frequency, after the system is stably operated for a period, the actual wind pressure difference is detected and compared with the target wind pressure difference; according to the comparison result, on the basis of the background frequency, the frequency of the circulating fan is adjusted, and accurate control of the surface circulating air speed of the tobacco leaves is achieved. The control method provided by the invention can timely adjust the frequency of the circulating fan, so that the surface air speed of the tobacco leaves in the tobacco containing chamber can be accurately controlled, the surface air speed of the tobacco leaves can meet the baking requirement of the tobacco leaves, the requirement of high-end high-quality tobacco leaf raw materials on baking is met, and the baking quality of the tobacco leaves is ensured.
Description
Technical Field
The invention belongs to the technical field of tobacco leaf curing barn, and particularly relates to an accurate frequency conversion intelligent control method of a tobacco leaf curing barn circulating fan based on air pressure difference.
Background
The circulating fan is one of core components for controlling the temperature and the humidity in the curing barn. The circulating fan brings heat into the tobacco containing chamber through the circulation effect, the tobacco is heated through full contact of circulating air and the surface of the tobacco, and meanwhile moisture transferred to the surface of the tobacco inside the tobacco is brought out. In order to ensure the tobacco leaf baking quality, the tobacco leaves in different baking stages need different dehydration rates, and the circulating wind speed of the leaf surface is one of the key factors influencing the dehydration rate of the tobacco leaves. Therefore, in order to coordinate the air speed of the circulating fan with the water loss of the tobacco leaves, the air speed of the circulating fan needs to be adjusted according to the baking stage of the tobacco leaves.
At present, in the prior art, the temperature is simply used as a reference, different fan frequencies are set through different baking temperature sections to carry out simple frequency conversion control, and the wind speed of an air inlet can only be accurately controlled. The problem is that at the same temperature, a certain fixed frequency is set, the air speed of an air inlet of a tobacco loading chamber is the same, but the gaps between tobacco leaves in the tobacco loading chamber are different due to different tobacco loading densities, different water loss degrees of the tobacco leaves and the like, so that even if the air speed of the air inlet is the same at the certain fixed frequency, the air speed of circulating air passing through the gaps between the tobacco leaves to reach the surfaces of the tobacco leaves is different due to the above reasons, so that the air speed of the surfaces of the tobacco leaves is different, finally, the air speed of the surfaces of the tobacco leaves cannot be effectively and accurately controlled to be coordinated with the water loss of the tobacco leaves, the water loss rate of the tobacco leaves is greatly fluctuated, and the requirement of.
Disclosure of Invention
The invention aims to solve the problem that the surface wind speed of tobacco leaves in a tobacco loading chamber of the existing tobacco leaf curing barn is difficult to meet the requirement of tobacco leaf curing, and provides an intelligent control method for the accurate frequency conversion of a circulating fan of the tobacco leaf curing barn based on wind pressure difference.
The technical scheme of the invention is as follows:
an accurate frequency conversion intelligent control method of a tobacco curing barn circulating fan based on air pressure difference comprises the following steps:
(1) setting temperatures Dn of different baking temperature sections, setting the circulating background frequency An of the fan of each baking temperature section, and setting a target wind pressure difference Bn on the basis;
(2) in the baking process, after stably operating for a period t based on a set baking temperature section Dn and a background frequency An operation control system, detecting An actual air pressure difference Broom between tobacco leaves at An air inlet layer and a return air inlet layer of a tobacco loading chamber through a differential pressure gauge arranged in the tobacco loading chamber, and comparing the actual air pressure difference Broom with a target air pressure difference Bn at the baking temperature section;
(3) and according to the comparison result, on the basis of the background frequency An, the frequency of the circulating fan is adjusted, so that the accurate control of the surface circulating air speed of the tobacco leaves is realized.
The fan background frequency is set in different periods based on the temperature, but due to the factors of different tobacco loading densities, different water loss of tobacco leaves and the like, the surface wind speeds of the tobacco leaves are different even under the same temperature and the same fan frequency. The essence of ensuring the tobacco leaf baking quality is that the wind speed needs to be accurately matched, and the requirement cannot be met only through temperature setting, so that the frequency of the fan is adjusted by combining wind pressure difference control on the basis of temperature, and the requirement of high-quality tobacco leaf baking on the wind speed can be met.
Further, the adjustment range of the baking temperature section temperature Dn is 20-70 ℃; the adjustment range of the background frequency An is 10-50 Hz; the adjustment range of the target wind pressure difference Bn is 0.1-200 Pa; wherein n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Furthermore, the adjustment range of the operation period t is 1-10 s.
Further, the adjusting method in the step (3) is as follows:
if Broom is less than or equal to Bn and Bn-Broom is less than or equal to E + Bn, the fan frequency maintains the set background frequency An unchanged;
if Broom < Bn and E < Bn-Broom ≦ Bn, the fan frequency is increased at C1 Hz based on the set background frequency An in the operation period t;
if the Broom is larger than the Bn and the Broom-Bn is less than or equal to E + Bn, the fan frequency maintains the set background frequency An unchanged;
if Broom > Bn, and Broom-Bn > E + Bn, the fan frequency is down-converted at a frequency of C2 Hz on the basis of a set background frequency An within the operation period t;
the detection of the next operation cycle is repeated in this way;
wherein C1 is the frequency raising amplitude in the operation period, and the parameter adjustment range is 0.1-5.0 Hz; c2 is the frequency reduction amplitude in the operation period, and the parameter adjustment range is 0.1-5.0 Hz; e is a coefficient, and the parameter adjustment range is 0.1-1.0.
The invention has the beneficial effects that:
(1) according to the accurate frequency conversion intelligent control method of the circulating fan of the tobacco leaf curing barn based on the air pressure difference, the frequency of the circulating fan is timely adjusted based on the background frequency of the circulating fan by combining the judgment and analysis of the change rate of the air inlet layer tobacco leaf and the air return layer tobacco leaf pressure difference in the gas flowing process in the curing process according to the requirements of the tobacco leaf surface air speed of different curing temperature sections of the tobacco leaf, and the fuzzy self-adaptive logic judgment is based on, so that the tobacco leaf surface air speed and the tobacco leaf dehydration are accurately and effectively controlled to be coordinated, and the requirements of the tobacco leaf curing on the tobacco leaf surface air speed are met.
(2) The control method provided by the invention can realize accurate control of the surface wind speed of the tobacco leaves in the tobacco containing chamber, thereby ensuring that the surface wind speed of the tobacco leaves can meet the baking requirement of the tobacco leaves, meeting the requirement of high-end high-quality tobacco leaf raw materials on baking and ensuring the baking quality of the tobacco leaves.
Detailed Description
The technical solutions of the present invention will be described in detail and fully with reference to the following specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For a further understanding of the present invention, reference will now be made in detail to the following examples.
The invention provides an intelligent control method for accurate frequency conversion of a circulating fan of a tobacco curing barn based on air pressure difference, which divides the curing process of tobacco leaves into 10 temperature sections, defines the circulating background frequency of the fan of each curing temperature section, then defines the circulating background frequency based on the air pressure difference between tobacco leaves at an air inlet layer and tobacco leaves at an air return inlet layer, when the air pressure difference is lower than a set value, the circulating fan increases the frequency to enable the air pressure difference to tend to the set value, and when the air pressure difference is higher than the set value, the circulating fan decreases the frequency to enable the air pressure difference to tend to the set value. The method comprises the following specific steps:
setting the temperature, background frequency and target wind pressure difference of 10 baking temperature sections before baking:
paragraph D1: a1 Hz, B1 Pa; paragraph D2: a2 Hz, B2 Pa; paragraph D3: a3 Hz, B3 Pa; paragraph D4: a4 Hz, B4 Pa; paragraph D5: a5 Hz, B5 Pa; paragraph D6: a6 Hz, B6 Pa; paragraph D7: a7 Hz, B7 Pa; paragraph D8: a8 Hz, B8 Pa; paragraph D9: a9 Hz, B9 Pa; paragraph D10: a10 Hz, B10 Pa.
D1-D10 are baking temperature range temperatures, and the reference adjustment range is 20-70 ℃;
A1-A10 are background frequencies, and the parameter adjustment range is 10-50 Hz;
B1-B10 are target wind pressure difference, and the parameter adjustment range is 0.1-200 Pa.
The intelligent adjustment of fan frequency in the baking process:
in the baking process, a control system firstly stably operates for a period t based on a set operation baking temperature section Dn and a set background frequency An, then detects An actual air pressure difference Broom between tobacco leaves at An air inlet layer and tobacco leaves at An air return layer of a tobacco loading chamber through a pressure difference meter arranged in the tobacco loading chamber, and compares the actual air pressure difference Broom with a target air pressure difference Bn at the baking temperature section; adjusting the frequency and the like of the circulating fan on the basis of the background frequency according to the comparison result; the control of the circulating air speed on the surface of the tobacco leaves is realized by adjusting the frequency of the circulating fan;
and in the operation period, the frequency of the circulating fan is regulated according to the following logic actions:
if Broom is less than or equal to Bn and Bn-Broom is less than or equal to E + Bn, the fan frequency maintains the set background frequency An unchanged;
if Broom < Bn and E < Bn-Broom ≦ Bn, the fan frequency is increased at C1 Hz based on the set background frequency An in the operation period t;
if the Broom is larger than the Bn and the Broom-Bn is less than or equal to E + Bn, the fan frequency maintains the set background frequency An unchanged;
if Broom > Bn, and Broom-Bn > E + Bn, the fan frequency is down-converted at a frequency of C2 Hz on the basis of a set background frequency An within the operation period t;
the detection of the next operating cycle is repeated in this way.
In the above parameters, Dn is the nth baking temperature stage temperature, and n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10;
an is the background frequency of the nth baking temperature section, and n is 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10;
bn is the target air pressure difference of the nth baking temperature section, n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10;
t is the operation cycle time, and the parameter adjustment range is 1-10 s;
c1 is the frequency rising amplitude in the operation period, and the parameter adjustment range is 0.1-5.0 Hz;
c2 is the frequency reduction amplitude in the operation period, and the parameter adjustment range is 0.1-5.0 Hz;
e is a coefficient, and the parameter adjustment range is 0.1-1.0.
Example 1
In this embodiment, before baking, the baking temperature, the background frequency, and the target air pressure difference are set according to the baking process:
paragraph D1: d1 ═ 38 ℃, a1 ═ 25Hz, B1 ═ 20 pa;
paragraph D2: d2 ═ 40 ℃, a2 ═ 35Hz, B2 ═ 15 pa;
paragraph D3: d3 ═ 42 ℃, A3 ═ 40Hz, B3 ═ 12 pa;
paragraph D4: d4 ═ 45 ℃, a4 ═ 45Hz, B4 ═ 10 pa;
paragraph D5: d5 ═ 47 ℃, a5 ═ 45Hz, B5 ═ 10 pa;
paragraph D6: d6 ═ 50 ℃, a6 ═ 40Hz, B6 ═ 8 pa;
paragraph D7: d7 ═ 54 ℃, a7 ═ 40Hz, B7 ═ 8 pa;
paragraph D8: d8 ═ 68 ℃, a8 ═ 35Hz, B8 ═ 5 pa;
paragraph D9: d9 ═ 68 ℃, a9 ═ 30Hz, B9 ═ 5 pa;
paragraph D10: d10 ═ 68 ℃, A10 ═ 30Hz, B10 ═ 5pa,
If the baking is carried out to the D3 stage, the background frequency is 40Hz, and the target wind pressure difference is 12 pa; at this time, the air pressure difference between the tobacco leaves at the air inlet layer and the tobacco leaves at the air return layer is detected within a time period t of 5s, if the detected actual air pressure difference is Broom 20pa which is greater than the target air pressure difference 12pa, the air pressure difference is calculated to be 20pa-12pa 8pa, 10% B3 is 1.2pa, 8pa >1.2pa, if the conditions are met, Broom > Bn, and Broom-Bn >0.1 × Bn (E takes a value of 0.1), then within the operation period of 5s, the fan frequency is reduced to 0.2Hz on the basis of 40Hz (C2 takes a value of 0.2), and is reduced to 39.8Hz from 40Hz, and the detection of the next period is repeated.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like made within the scope of the present invention should be included in the patent protection scope of the present invention.
Claims (4)
1. An accurate frequency conversion intelligent control method of a tobacco curing barn circulating fan based on air pressure difference is characterized by comprising the following steps:
(1) setting temperatures Dn of different baking temperature sections, setting the circulating background frequency An of the fan of each baking temperature section, and setting a target wind pressure difference Bn on the basis;
(2) in the baking process, after stably operating for a period t based on a set baking temperature section Dn and a background frequency An operation control system, detecting An actual air pressure difference Broom between tobacco leaves at An air inlet layer and a return air inlet layer of a tobacco loading chamber through a differential pressure gauge arranged in the tobacco loading chamber, and comparing the actual air pressure difference Broom with a target air pressure difference Bn at the baking temperature section;
(3) and according to the comparison result, on the basis of the background frequency An, the frequency of the circulating fan is adjusted, so that the accurate control of the surface circulating air speed of the tobacco leaves is realized.
2. The accurate frequency conversion intelligent control method of the circulating fan of the tobacco leaf curing barn based on the wind pressure difference according to claim 1, wherein the adjusting range of the curing temperature section temperature Dn is 20-70 ℃; the adjustment range of the background frequency An is 10-50 Hz; the adjustment range of the target wind pressure difference Bn is 0.1-200 Pa; wherein n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
3. The accurate frequency conversion intelligent control method of the tobacco flue-curing barn circulating fan based on the wind pressure difference as claimed in claim 1, wherein the adjustment range of the operation period t is 1-10 s.
4. The accurate frequency conversion intelligent control method of the tobacco flue-curing barn circulating fan based on the wind pressure difference according to claim 1, wherein the adjusting method in the step (3) is as follows:
if Broom is less than or equal to Bn and Bn-Broom is less than or equal to E + Bn, the fan frequency maintains the set background frequency An unchanged;
if Broom < Bn and E < Bn-Broom ≦ Bn, the fan frequency is increased at C1 Hz based on the set background frequency An in the operation period t;
if the Broom is larger than the Bn and the Broom-Bn is less than or equal to E + Bn, the fan frequency maintains the set background frequency An unchanged;
if Broom > Bn, and Broom-Bn > E + Bn, the fan frequency is down-converted at a frequency of C2 Hz on the basis of a set background frequency An within the operation period t;
the detection of the next operation cycle is repeated in this way;
wherein C1 is the frequency raising amplitude in the operation period, and the parameter adjustment range is 0.1-5.0 Hz; c2 is the frequency reduction amplitude in the operation period, and the parameter adjustment range is 0.1-5.0 Hz; e is a coefficient, and the parameter adjustment range is 0.1-1.0.
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