CN110897185A - Intelligent frequency conversion control method for circulating fan during tobacco leaf baking in descending bulk curing barn - Google Patents
Intelligent frequency conversion control method for circulating fan during tobacco leaf baking in descending bulk curing barn Download PDFInfo
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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
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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
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Abstract
The invention discloses an intelligent frequency conversion control method of a circulating fan during tobacco leaf baking in a descending bulk curing barn. According to the importance and contribution degree of the target dry-bulb temperature difference (a), the upper shed temperature difference (b) and the lower shed temperature difference (b) and the wet-bulb temperature difference (c) to the tobacco leaf baking process in each baking stage, coefficient assignment is respectively given, the coefficient range is 0-1, and the method provides favorable guarantee for improving the softness of the tobacco leaves, increasing the aroma and oil content of the tobacco leaves, enhancing the chromaticity of the tobacco leaves and avoiding the stiffness of the tobacco leaves.
Description
Technical Field
The invention relates to an intelligent variable frequency control method of a circulating fan during tobacco leaf curing in a descending bulk curing barn, and belongs to the field of tobacco leaf curing.
Background
Compared with the traditional natural ventilation curing barn, the bulk curing barn has the advantages that the bad tobacco curing phenomenon is obviously reduced, but the phenomena of light color, reduced oil content, reduced aroma and the like of tobacco leaves generally exist, the main reasons are that the current circulating fan of the bulk curing barn has few gears, the intelligent frequency conversion means is lack, the intelligent frequency conversion control method is inflexible, automatic real-time frequency conversion adjustment cannot be carried out according to the requirements of the tobacco leaf curing process and the temperature and humidity change of the curing barn, further, the fan in the early stage of yellowing is enabled to be in invalid operation, a large amount of water is dissipated, and the air quantity in the muscle drying stage is too large, so that the problems of loss of volatile.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the intelligent frequency conversion control method of the circulating fan during tobacco leaf curing of the descending bulk curing barn is provided, and the technical problems that the color of cured tobacco leaves is light, the oil content is reduced, the fragrance is reduced and the like due to the fact that the circulating fan of the existing tobacco leaf curing bulk curing barn cannot be automatically adjusted in a real-time frequency conversion mode according to the requirements of a tobacco leaf curing process and the temperature and humidity change of the curing barn are solved.
The technical scheme of the invention is as follows: an intelligent frequency conversion control method of a circulating fan during tobacco leaf baking in a descending bulk curing barn comprises the following steps:
s1, acquiring the current shed-entering target dry bulb temperature and shed-entering target wet bulb temperature set by the tobacco leaf baking process;
s2, acquiring the actual dry bulb temperature of the upper shed, the actual wet bulb temperature of the upper shed and the actual dry bulb temperature of the lower shed when the current tobacco leaves are baked;
s3, performing frequency conversion control on the circulating fan according to the following ten conditions according to the range of the target dry bulb temperature of the ceiling;
in the first case: the temperature of the target dry bulb on the greenhouse is less than or equal to 35 ℃, and the frequency Y of the fan is 10 hz;
in the second case: when the temperature of the target dry bulb on the greenhouse is more than 35 ℃ and less than or equal to 37 ℃, the frequency Y interval of the fan is 10-20hz, the calculation formula is as follows,
Y＝0.10492a3-0.82018a2+2.338a-0.11428b2+1.87428b+8.3332c3+12.8572c2+9.9524c+5.88298；
in the third case: the temperature of the target dry bulb on the greenhouse is more than 37 ℃ and less than or equal to 40 ℃, the frequency Y interval of the fan is 20-34hz, the calculation formula is,
Y＝-0.02858a2+0.85142a+1.36b-1.42856c2+7.9428c+16.6856；
in a fourth case: the temperature of the target dry bulb is less than or equal to 42 ℃ when the temperature is more than 40 ℃, the frequency Y interval of the fan is 34-46hz, the calculation formula is as follows,
Y＝0.02916a2+0.29014a-0.04287b2+1.24287b-1.7857c2+8.9285C+31.4472；
in the fifth case: when the temperature of the target dry bulb is higher than 42 ℃ and lower than or equal to 45 ℃, the frequency Y interval of the fan is 46-50hz, the calculation formula is as follows,
Y＝0.1a+0.3b-1.0904c2+3.7173c+45.0025；
in the sixth case: when the temperature of the target dry bulb on the greenhouse is more than 45 ℃ and less than or equal to 48 ℃, the frequency Y interval of the fan is 50-42hz, the calculation formula is as follows,
Y＝0.2a+0.6b+5c+40.2；
in the seventh case: when the temperature of the target dry bulb on the greenhouse is more than 48 ℃ and less than or equal to 54 ℃, the frequency Y interval of the fan is 42-34hz, the calculation formula is as follows,
Y＝0.4a+0.6b+3c+29.8；
in the eighth case: when the temperature of the target dry bulb on the greenhouse is more than 54 ℃ and less than or equal to 60 ℃, the frequency Y interval of the fan is 34-30hz, the calculation formula is as follows,
Y＝0.25a+0.3b+0.66666c+26.45；
the ninth case: the target temperature of the shed is more than 60 ℃ and less than or equal to 68 ℃, the wind frequency Y interval is 34-30hz, the calculation formula is,
Y＝0.19998a+0.2b+0.6666c+26.3998；
in the tenth case: when the target temperature of the greenhouse is more than or equal to 68 ℃, the machine frequency Y is 30 hz;
in the above formula, a is the target dry-wet-bulb temperature difference, and a is the ceiling target dry-bulb temperature-ceiling target wet-bulb temperature; b is a dry-bulb temperature difference meter of an upper shed and a lower shed, and b is the actual dry-bulb temperature of the upper shed-the actual dry-bulb temperature of the lower shed; and c is the temperature difference of the wet bulb, and c is the actual wet bulb temperature of the greenhouse-the target wet bulb temperature of the greenhouse.
The invention has the beneficial effects that: according to the invention, an intelligent variable frequency regression equation of the circulating fan is provided according to the air circulation characteristics in the curing room in the bulk curing process of the flue-cured tobacco, the fan frequency requirements under different curing processes and curing conditions of the tobacco, the frequency parameters of the circulating fan can be matched according to different temperature points (or stages) for curing the tobacco, different temperature and humidity deviation conditions, dynamic changes of a temperature field and air speed in the curing room, dynamic changes of air pressure and curing process parameters and the like, and the intelligent variable frequency of the circulating fan is realized along with the temperature and humidity changes of the tobacco in each stage of curing in the falling bulk curing room of the flue-cured tobacco according to an intelligent variable frequency control method, so that.
According to the invention, through improvement of a control method of a circulating fan of a bulk curing barn for flue-cured tobacco, especially (1) according to requirements of different curing stages of tobacco leaves, the upper limit and the lower limit of the frequency of the circulating fan of the tobacco leaves in different curing stages are definitely specified, and the contribution coefficients of a target dry-bulb temperature difference (a), a target upper shed temperature difference (b) and a target wet-bulb temperature difference (c) are set, so that the curing requirements are met, and the curing quality of the tobacco leaves is improved; (2) the intelligent variable frequency regression equation of the descending type bulk curing barn circulating fan in each stage is provided, so that the circulating fan can carry out intelligent variable frequency according to the actual situation of tobacco leaf curing, the actual requirement of tobacco leaf curing is met, the curing benefit is stabilized, the softness of tobacco leaves is improved, the aroma and the oil content of the tobacco leaves are increased, the chromaticity of the tobacco leaves is enhanced, and the stiffness is avoided, thereby providing a favorable guarantee.
In conclusion, the invention can effectively solve the problems of the existing tobacco leaf bulk curing barn that the control of the circulating fan is not flexible, the control of tobacco leaf curing temperature rise and humidity discharge is not sensitive due to inaccuracy, and the tobacco leaf substance conversion is insufficient, the fragrance is insufficient, the oil content is poor, the tobacco leaf is stiff and the like. The invention is particularly suitable for intelligent frequency conversion control of the circulating fan of the descending bulk curing barn for flue-cured tobacco, can realize accurate curing of tobacco leaves and improve the curing quality.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The embodiment of the invention provides an intelligent frequency conversion control method of a circulating fan during tobacco leaf baking in a descending bulk curing barn, which comprises the following steps:
and S1, acquiring the current shed-entering target dry bulb temperature and shed-entering target wet bulb temperature set by the tobacco leaf baking process.
After the tobacco leaves are hung in the curing barn, the tobacco leaves need to be input into the curing process. For a falling bulk curing barn, the tobacco curing process parameters include the curing time, the ceiling target dry bulb temperature and the ceiling target wet bulb temperature, and generally, the ceiling target dry bulb temperature and the ceiling target wet bulb temperature vary with the curing time.
And when the tobacco leaf baking process is determined, obtaining the current shed-entering target dry bulb temperature and the shed-entering target wet bulb temperature according to the baking time.
And S2, acquiring the actual dry bulb temperature of the upper shed, the actual wet bulb temperature of the upper shed and the actual dry bulb temperature of the lower shed when the current tobacco leaves are baked.
The actual dry bulb temperature of the upper shed, the actual wet bulb temperature of the upper shed and the actual dry bulb temperature of the lower shed during the current leaf baking are obtained through sensors arranged on the upper shed and the lower shed in the descending bulk curing barn.
And S3, performing frequency conversion control on the circulating fan according to the following ten conditions according to the range of the target dry bulb temperature of the ceiling.
After the upper shed target dry bulb temperature is obtained, the following situation of the upper shed target dry bulb temperature is judged, and the frequency of the fan is controlled according to the corresponding situation.
In the first case: the temperature of the target dry bulb on the greenhouse is less than or equal to 35 ℃, and the frequency Y of the fan is 10 hz;
in the second case: when the temperature of the target dry bulb on the greenhouse is more than 35 ℃ and less than or equal to 37 ℃, the frequency Y interval of the fan is 10-20hz, the calculation formula is as follows,
Y＝0.10492a3-0.82018a2+2.338a-0.11428b2+1.87428b+8.3332c3+12.8572c2+9.9524c+5.88298；
in the third case: the temperature of the target dry bulb on the greenhouse is more than 37 ℃ and less than or equal to 40 ℃, the frequency Y interval of the fan is 20-34hz, the calculation formula is,
Y＝-0.02858a2+0.85142a+1.36b-1.42856c2+7.9428c+16.6856；
in a fourth case: the temperature of the target dry bulb is less than or equal to 42 ℃ when the temperature is more than 40 ℃, the frequency Y interval of the fan is 34-46hz, the calculation formula is as follows,
Y＝0.02916a2+0.29014a-0.04287b2+1.24287b-1.7857c2+8.9285C+31.4472；
in the fifth case: when the temperature of the target dry bulb is higher than 42 ℃ and lower than or equal to 45 ℃, the frequency Y interval of the fan is 46-50hz, the calculation formula is as follows,
Y＝0.1a+0.3b-1.0904c2+3.7173c+45.0025；
in the sixth case: when the temperature of the target dry bulb on the greenhouse is more than 45 ℃ and less than or equal to 48 ℃, the frequency Y interval of the fan is 50-42hz, the calculation formula is as follows,
Y＝0.2a+0.6b+5c+40.2；
in the seventh case: when the temperature of the target dry bulb on the greenhouse is more than 48 ℃ and less than or equal to 54 ℃, the frequency Y interval of the fan is 42-34hz, the calculation formula is as follows,
Y＝0.4a+0.6b+3c+29.8；
in the eighth case: when the temperature of the target dry bulb on the greenhouse is more than 54 ℃ and less than or equal to 60 ℃, the frequency Y interval of the fan is 34-30hz, the calculation formula is as follows,
Y＝0.25a+0.3b+0.66666c+26.45；
the ninth case: the target temperature of the shed is more than 60 ℃ and less than or equal to 68 ℃, the wind frequency Y interval is 34-30hz, the calculation formula is,
Y＝0.19998a+0.2b+0.6666c+26.3998；
in the tenth case: when the target temperature of the greenhouse is more than or equal to 68 ℃, the machine frequency Y is 30 hz;
in the above formula, a is the target dry-wet-bulb temperature difference, and a is the ceiling target dry-bulb temperature-ceiling target wet-bulb temperature; b is a dry-bulb temperature difference meter of an upper shed and a lower shed, and b is the actual dry-bulb temperature of the upper shed-the actual dry-bulb temperature of the lower shed; and c is the temperature difference of the wet bulb, and c is the actual wet bulb temperature of the greenhouse-the target wet bulb temperature of the greenhouse.
Example 1:
the method comprises the following steps of setting a conventional method (comparison) of a circulating fan and carrying out intelligent variable frequency control (treatment) on the circulating fan according to the method by utilizing the conventional curing barn equipment with the total power of the circulating fan being 2.2KW, wherein the specific operations are as follows:
comparison: when the target temperature is less than or equal to 40 ℃, the circulating fan is set to be in low-gear control; when the target temperature is higher than 40 ℃ and lower than or equal to 54 ℃, the circulating fan is set to be in high-grade control; when 54 ℃ is less than the target temperature; the circulator blower is set to low gear control (remark, the high gear blower speed is 1440 rpm, the low gear blower speed is 960 rpm).
And (3) treatment: according to the method, after the tobacco leaves are loaded into a curing barn to be cured according to requirements, an intelligent variable frequency regression equation is constructed according to the following ten conditions in sequence, and the frequency of a circulating fan at each stage is adjusted and controlled according to the intelligent variable frequency regression equation:
in the first case: the temperature of the target dry bulb on the greenhouse is less than or equal to 35 ℃, and the frequency Y of the fan is 10 hz;
in the second case: when the temperature of the target dry bulb on the greenhouse is more than 35 ℃ and less than or equal to 37 ℃, the frequency Y interval of the fan is 10-20hz, the calculation formula is as follows,
Y＝0.10492a3-0.82018a2+2.338a-0.11428b2+1.87428b+8.3332c3+12.8572c2+9.9524c+5.88298；
in the third case: the temperature of the target dry bulb on the greenhouse is more than 37 ℃ and less than or equal to 40 ℃, the frequency Y interval of the fan is 20-34hz, the calculation formula is,
Y＝-0.02858a2+0.85142a+1.36b-1.42856c2+7.9428c+16.6856；
in a fourth case: the temperature of the target dry bulb is less than or equal to 42 ℃ when the temperature is more than 40 ℃, the frequency Y interval of the fan is 34-46hz, the calculation formula is as follows,
Y＝0.02916a2+0.29014a-0.04287b2+1.24287b-1.7857c2+8.9285C+31.4472；
in the fifth case: when the temperature of the target dry bulb is higher than 42 ℃ and lower than or equal to 45 ℃, the frequency Y interval of the fan is 46-50hz, the calculation formula is as follows,
Y＝0.1a+0.3b-1.0904c2+3.7173c+45.0025；
in the sixth case: when the temperature of the target dry bulb on the greenhouse is more than 45 ℃ and less than or equal to 48 ℃, the frequency Y interval of the fan is 50-42hz, the calculation formula is as follows,
Y＝0.2a+0.6b+5c+40.2；
in the seventh case: when the temperature of the target dry bulb on the greenhouse is more than 48 ℃ and less than or equal to 54 ℃, the frequency Y interval of the fan is 42-34hz, the calculation formula is as follows,
Y＝0.4a+0.6b+3c+29.8；
in the eighth case: when the temperature of the target dry bulb on the greenhouse is more than 54 ℃ and less than or equal to 60 ℃, the frequency Y interval of the fan is 34-30hz, the calculation formula is as follows,
Y＝0.25a+0.3b+0.66666c+26.45；
the ninth case: the target temperature of the shed is more than 60 ℃ and less than or equal to 68 ℃, the wind frequency Y interval is 34-30hz, the calculation formula is,
Y＝0.19998a+0.2b+0.6666c+26.3998；
in the tenth case: when the target temperature of the greenhouse is more than or equal to 68 ℃, the machine frequency Y is 30 hz;
in the above formula, a is the target dry-wet-bulb temperature difference, and a is the ceiling target dry-bulb temperature-ceiling target wet-bulb temperature; b is a dry-bulb temperature difference meter of an upper shed and a lower shed, and b is the actual dry-bulb temperature of the upper shed-the actual dry-bulb temperature of the lower shed; and c is the temperature difference of the wet bulb, and c is the actual wet bulb temperature of the greenhouse-the target wet bulb temperature of the greenhouse.
Table 1. the intelligent frequency conversion regulation and control results of the circulating fan are as follows:
a) table 1 shows the regulation and control result of the intelligent frequency conversion part of the circulating fan, wherein the dry-bulb temperature in the table is the target dry-bulb temperature of the upper shed, the target temperature and humidity are the target dry-bulb temperature and the target wet-bulb temperature of the upper shed, the temperature and humidity of the upper shed are the actual dry-bulb temperature and the actual wet-bulb temperature of the upper shed, and the temperature and humidity of the lower shed are the actual dry-bulb temperature and the actual wet-bulb temperature of the lower shed.
b) According to the intelligent frequency conversion control baking method of the circulating fan, the smaller the frequency is, the lower the rotating speed of the fan is, when the frequency is 35, the rotating speed of the fan is equivalent to the rotating speed of a low-grade fan which is conventionally controlled to bake by the circulating fan, and when the frequency is 50, the rotating speed of the fan is equivalent to the rotating speed of a high-grade fan which is conventionally controlled to bake by the circulating fan.
The influence of different circulating fan control methods on the appearance quality, aroma components and sensory evaluation quality of the flue-cured tobacco leaves is as follows:
1. comparative analysis of appearance quality difference of tobacco leaves after different treatments
TABLE 2 influence of appearance quality of tobacco leaves after curing by two methods of circulating fan control
As shown in Table 2, the orange smoke rate of the cured tobacco leaves treated by the intelligent variable frequency control of the circulating fan is higher than that of the control, and the oil content is higher than that of the control when the grade is 'good'; correspondingly, the proportion of the impurity and the green of the cured tobacco leaves and the proportion of the tobacco leaves with less oil content are lower than the contrast ratio after the intelligent frequency conversion control treatment. It can be seen that the appearance quality of the tobacco leaves baked by the circulating fan intelligent frequency conversion control method is superior to that of the tobacco leaves baked by the circulating fan traditional control baking method.
2. Content comparison analysis of aroma substances of tobacco leaves after different treatments
TABLE 3 aroma component content (ng/g) of tobacco leaves after two methods of circulating fan control
From the content of the aroma substance components of the 80 types of tobacco leaves detected at this time, the total content of the aroma substance components of the tobacco leaves baked by the intelligent variable frequency control method of the circulating fan reaches 49602.49ng/g, which is 10181.94ng/g higher than that of the aroma substance components of the tobacco leaves baked by the traditional control method of the circulating fan, and the improvement range is 25.83%. The results fully show that the curing method adopting the intelligent variable-frequency control circulating fan can greatly improve the level of the tobacco fragrance substances.
3 sensory quality of test
TABLE 4 sensory quality of flue-cured tobacco leaf by two control methods of circulating fan
Table 3 shows the sensory evaluation and quality comparison analysis of the tobacco leaves cured by two different control methods of the circulating fan, and it can be seen that the total sensory evaluation and quality score of the tobacco leaves cured by the intelligent variable-frequency control circulating fan reaches 75.23 minutes, which is 71.77 higher than the sensory evaluation and quality score of the tobacco leaves cured by the conventional control method of the circulating fan, and is particularly reflected in the aspects of aroma quality, aroma quantity and aftertaste of the tobacco leaves after curing.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (1)
1. An intelligent frequency conversion control method of a circulating fan during tobacco leaf baking in a descending bulk curing barn is characterized by comprising the following steps:
s1, acquiring the current shed-entering target dry bulb temperature and shed-entering target wet bulb temperature set by the tobacco leaf baking process;
s2, acquiring the actual dry bulb temperature of the upper shed, the actual wet bulb temperature of the upper shed and the actual dry bulb temperature of the lower shed when the current tobacco leaves are baked;
s3, performing frequency conversion control on the circulating fan according to the following ten conditions according to the range of the target dry bulb temperature of the ceiling;
in the first case: the temperature of the target dry bulb on the greenhouse is less than or equal to 35 ℃, and the frequency Y of the fan is 10 hz;
in the second case: when the temperature of the target dry bulb on the greenhouse is more than 35 ℃ and less than or equal to 37 ℃, the frequency Y interval of the fan is 10-20hz, the calculation formula is as follows,
Y＝0.10492a3-0.82018a2+2.338a-0.11428b2+1.87428b+8.3332c3+12.8572c2+9.9524c+5.88298；
in the third case: the temperature of the target dry bulb on the greenhouse is more than 37 ℃ and less than or equal to 40 ℃, the frequency Y interval of the fan is 20-34hz, the calculation formula is,
Y＝-0.02858a2+0.85142a+1.36b-1.42856c2+7.9428c+16.6856；
in a fourth case: the temperature of the target dry bulb is less than or equal to 42 ℃ when the temperature is more than 40 ℃, the frequency Y interval of the fan is 34-46hz, the calculation formula is as follows,
Y＝0.02916a2+0.29014a-0.04287b2+1.24287b-1.7857c2+8.9285C+31.4472；
in the fifth case: when the temperature of the target dry bulb is higher than 42 ℃ and lower than or equal to 45 ℃, the frequency Y interval of the fan is 46-50hz, the calculation formula is as follows,
Y＝0.1a+0.3b-1.0904c2+3.7173c+45.0025；
in the sixth case: when the temperature of the target dry bulb on the greenhouse is more than 45 ℃ and less than or equal to 48 ℃, the frequency Y interval of the fan is 50-42hz, the calculation formula is as follows,
Y＝0.2a+0.6b+5c+40.2；
in the seventh case: when the temperature of the target dry bulb on the greenhouse is more than 48 ℃ and less than or equal to 54 ℃, the frequency Y interval of the fan is 42-34hz, the calculation formula is as follows,
Y＝0.4a+0.6b+3c+29.8；
in the eighth case: when the temperature of the target dry bulb on the greenhouse is more than 54 ℃ and less than or equal to 60 ℃, the frequency Y interval of the fan is 34-30hz, the calculation formula is as follows,
Y＝0.25a+0.3b+0.66666c+26.45；
the ninth case: the target temperature of the shed is more than 60 ℃ and less than or equal to 68 ℃, the wind frequency Y interval is 34-30hz, the calculation formula is,
Y＝0.19998a+0.2b+0.6666c+26.3998；
in the tenth case: when the target temperature of the greenhouse is more than or equal to 68 ℃, the machine frequency Y is 30 hz;
in the above formula, a is the target dry-wet-bulb temperature difference, and a is the ceiling target dry-bulb temperature-ceiling target wet-bulb temperature; b is a dry-bulb temperature difference meter of an upper shed and a lower shed, and b is the actual dry-bulb temperature of the upper shed-the actual dry-bulb temperature of the lower shed; and c is the temperature difference of the wet bulb, and c is the actual wet bulb temperature of the greenhouse-the target wet bulb temperature of the greenhouse.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112137151A (en) * | 2020-10-22 | 2020-12-29 | 中国农业科学院烟草研究所 | Accurate frequency conversion intelligent control method of tobacco curing barn circulating fan based on air pressure difference |
| CN112602958A (en) * | 2020-12-15 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Tobacco dryer and control method of dry-wet bulb temperature sensor |
| CN113712233A (en) * | 2020-05-26 | 2021-11-30 | 青岛海信日立空调系统有限公司 | Drying equipment |
| CN113796557A (en) * | 2021-08-24 | 2021-12-17 | 中国烟草总公司郑州烟草研究院 | Tobacco leaf dynamic humidity control baking control method and control system |
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| CN113712233A (en) * | 2020-05-26 | 2021-11-30 | 青岛海信日立空调系统有限公司 | Drying equipment |
| CN113712233B (en) * | 2020-05-26 | 2022-07-29 | 青岛海信日立空调系统有限公司 | Drying equipment |
| CN112137151A (en) * | 2020-10-22 | 2020-12-29 | 中国农业科学院烟草研究所 | Accurate frequency conversion intelligent control method of tobacco curing barn circulating fan based on air pressure difference |
| CN112602958A (en) * | 2020-12-15 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Tobacco dryer and control method of dry-wet bulb temperature sensor |
| CN113796557A (en) * | 2021-08-24 | 2021-12-17 | 中国烟草总公司郑州烟草研究院 | Tobacco leaf dynamic humidity control baking control method and control system |
| CN113796557B (en) * | 2021-08-24 | 2022-12-27 | 中国烟草总公司郑州烟草研究院 | Tobacco leaf dynamic humidity control baking control method and control system |
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