A method of system operation in the event of temperature anomalies in tobacco curing
By adding an abnormal temperature baking backup module and a process threshold curve to the automatic tobacco curing controller, the dry-wet difference is calculated to adjust the wet-bulb temperature, thus solving the problem of abnormal temperature during tobacco curing, ensuring tobacco quality and reducing economic losses.
Patent Information
- Application Number
- CN202311032885.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-16
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2043-08-16
Smart Images
Figure CN116880631B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of tobacco curing technology, and specifically relates to a system operation method when the temperature is abnormal during tobacco curing. Background Technology
[0002] Current tobacco curing methods typically employ a three-stage, seven-step process, dividing the entire curing process into three stages: color change, color fixation, and drying. The color change stage involves three temperature settings, while the color fixation and drying stages each involve two temperature settings. Specifically, the settings are configured on the automatic tobacco curing controller, specifying the required time, dry-bulb temperature, and wet-bulb temperature for each step. Once set, the controller adjusts the operation of the heating and dehumidification equipment accordingly. The specific time-temperature curves for this three-stage, seven-step method are shown below. Figure 1 .
[0003] The target dry-bulb and wet-bulb temperatures at different stages of the tobacco curing process in the aforementioned intensive curing barn are fixed. Once set, the intensive curing barn controller automatically controls the heating and dehumidification equipment to ensure that the measured dry-bulb and wet-bulb temperatures inside the barn remain near the set target temperatures. Under normal circumstances, this application can adequately meet the needs of tobacco curing. However, in actual use, the barn may experience abnormal temperature drops due to fuel supply interruptions or heating equipment malfunctions. This can cause the measured dry-bulb temperature to fall significantly below the target dry-bulb temperature, while the measured wet-bulb temperature, having reached the set target wet-bulb humidity value, renders the dehumidification function completely ineffective. At this point, condensation often occurs because the temperature inside the barn decreases and humid air cannot escape. These condensed water droplets falling onto the tobacco leaves can cause problems such as uneven tobacco growth, severely affecting the quality of the cured tobacco and causing economic losses for tobacco farmers. Summary of the Invention
[0004] In view of this, the purpose of the present invention is to provide a system operation method when the temperature is abnormal during tobacco curing, which can overcome the shortcomings of the prior art.
[0005] The technical solution of this invention is as follows: When an abnormal temperature occurs during tobacco curing, the system operation method involves adding an abnormal temperature curing backup module and a curing process threshold curve to the automatic tobacco curing controller. During each stage of curing, if the measured dry-bulb temperature exceeds the temperature on the curing process threshold curve, the abnormal temperature curing backup module is triggered. This module includes a database of relative humidity values βn for each stage of tobacco curing. The module first obtains the measured dry-bulb temperature value, then calculates the wet-bulb / dry-bulb difference e using the measured dry-bulb temperature value and the actual relative humidity value βn for that stage. Finally, by subtracting the wet-bulb / dry-bulb difference e from the measured dry-bulb temperature value, the current target wet-bulb temperature is obtained. The automatic tobacco curing controller then controls the dehumidification motor on the curing barn to work and dehumidify.
[0006] The aforementioned system operation method for abnormal temperature during tobacco curing involves obtaining the relative humidity value βn database by setting the tobacco curing process curve data in the automatic tobacco controller according to the process parameters, determining the target dry-bulb temperature and target wet-bulb temperature for different curing stages, and simultaneously calculating the target relative humidity value βn corresponding to the set target dry-bulb temperature and target wet-bulb temperature for different curing stages.
[0007] The aforementioned system operation method for abnormal temperature during tobacco curing is that the curing process threshold curve is for the target dry-bulb curing temperature, and the temperature threshold is lower than the target dry-bulb curing temperature.
[0008] Compared with existing technologies, this invention can be achieved by adding an abnormal temperature baking backup module and a baking process threshold curve to the existing automatic tobacco controller. It has the advantages of simple structure and low modification cost. After the improvement, it can effectively avoid the situation where abnormal conditions in the tobacco curing process cause a large drop in temperature in the curing barn, which would damage the tobacco leaves. It can ensure the quality of tobacco curing, reduce the economic losses of tobacco farmers, and has high practical value and promotion value. Attached Figure Description
[0009] Figure 1 Time-temperature curves for the three-stage, seven-step tobacco roasting method;
[0010] Figure 2 This is a flowchart of the present invention;
[0011] Figure 3 This is a logic diagram of the present invention;
[0012] Figure 4 Here is a partial humidity comparison table; Detailed Implementation
[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0015] Implementation 1, Figure 2 and Figure 3 As shown, the system operation method for abnormal temperature during tobacco curing specifically includes the following steps:
[0016] Step 1: Set the tobacco curing process curve data on the automatic tobacco controller, determine the target dry-bulb temperature and target wet-bulb temperature for different curing stages, and simultaneously calculate and store the target relative humidity value βn corresponding to the set target dry-bulb temperature and target wet-bulb temperature for different curing stages. The method is as follows: the tobacco curing technicians set the target dry-bulb temperature, target dry-bulb humidity and stage duration for different curing stages on the intensive curing barn controller. The intensive curing barn controller automatically calculates the target relative humidity βn corresponding to different stages based on the set target dry-bulb temperature and target wet-bulb temperature, referring to the "Appendix 1 Dry-bulb Temperature-Relative Humidity Comparison Table", and stores it in the microcontroller's internal flash (database) for later use; at the same time, set up an abnormal temperature curing backup module on the automatic tobacco controller.
[0017] Step 2: The abnormal temperature baking backup module includes a baking process threshold curve, which is for dry bulb temperature. This curve is parallel to the tobacco leaf baking process curve, with a temperature difference of 3℃. When the measured dry bulb temperature in the curing barn exceeds the baking process threshold curve, the abnormal temperature baking backup module function is activated.
[0018] Step 3: After activating the abnormal temperature baking backup module function, the abnormal temperature baking backup module first reads the measured dry-bulb temperature in the current baking room and the target relative humidity value βn corresponding to this stage during normal baking, and calculates the corresponding dry-wet difference e.
[0019] Step 4: Subtract the dry-wet difference e calculated in Step 4 from the measured dry-bulb temperature in the current drying oven to obtain the current target wet-bulb temperature.
[0020] Step 5: Then, the dehumidification motor on the curing barn is controlled by the automatic tobacco controller to dehumidify to the target wet bulb temperature.
[0021] This method is integrated into the control rules of the intensive drying oven controller. The intensive drying oven controller will automatically detect the relationship between the current dry-bulb temperature and the target dry-bulb temperature, and calculate the current target dry-bulb humidity according to the method of this invention, thereby making up for the deficiency of existing intensive drying oven controllers in the industry that do not respond to large temperature drops.
[0022] Based on the above method, let's take a practical example to illustrate step 1. Figure 1 For the dry-bulb and wet-bulb temperature curves at different time periods, the target relative humidity value βn corresponding to the set target dry-bulb and wet-bulb temperatures at different baking stages is calculated simultaneously. The calculation is compared with the following... Figure 4 The relative humidity value βn of the target stage can be obtained from the humidity comparison table shown in Table 1.
[0023]
[0024]
[0025] Table 1. Relative humidity values βn for some targets.
[0026] Step 2: Taking the dry bulb temperature of 46℃ during the color fixing stage as an example, if the room temperature drops to 42℃ due to damage to the combustion furnace or lack of fuel, the temperature difference is greater than 3℃. At this time, the abnormal temperature baking backup module function is automatically activated.
[0027] Step 3: After activating the abnormal temperature baking backup module function, the abnormal temperature baking backup module first reads the measured dry-bulb temperature in the current baking chamber as 42℃, and the target relative humidity value βn corresponding to this stage during normal baking as 57, and then... Figure 4 In the humidity comparison table shown, find the dry bulb temperature of 42 and the relative humidity of 57, and calculate the corresponding dry-wet difference e as 8℃.
[0028] Step 4: Subtract the dry-wet difference e calculated in Step 4 (8℃) from the current measured dry-bulb temperature in the drying oven to obtain the current target wet-bulb temperature of 34℃.
[0029] Step 5: Then, the dehumidification motor on the curing barn is controlled by the automatic tobacco controller to dehumidify to the target wet bulb temperature of ℃.
[0030] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. The embodiments selected and specifically described in this specification are intended to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.
Claims
1. A system operation method for handling abnormal temperatures during tobacco curing, characterized in that, This method involves adding an abnormal temperature baking backup module and a baking process threshold curve to the automatic tobacco curing controller. During each stage of the curing process, if the measured dry-bulb temperature exceeds the temperature of the baking process threshold curve, the abnormal temperature baking backup module is triggered. The abnormal temperature baking backup module includes a database of relative humidity values βn for each stage of the tobacco curing process. The abnormal temperature baking backup module first obtains the measured dry-bulb temperature value, then uses the measured dry-bulb temperature value and the actual relative humidity value βn for that stage to calculate the wet-bulb-dry difference e. Then, by subtracting the wet-bulb-dry difference e from the measured dry-bulb temperature value, the current target wet-bulb temperature can be obtained. Subsequently, the automatic tobacco curing controller controls the dehumidification motor on the curing barn to work and dehumidify.
2. The system operation method for abnormal temperature during tobacco curing according to claim 1, characterized in that: The method for obtaining the relative humidity value βn database is to set the tobacco curing process curve data in the automatic tobacco controller according to the process parameters, determine the target dry bulb temperature and target wet bulb temperature at different curing stages, and simultaneously calculate the target relative humidity value βn corresponding to the set target dry bulb temperature and target wet bulb temperature at different curing stages.
3. The system operation method for abnormal temperature during tobacco curing according to claim 1, characterized in that: The aforementioned baking process threshold curve is for the target baking dry ball temperature, and the temperature threshold is lower than the target baking dry ball temperature.
Citation Information
Patent Citations
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CN102048234A
Low-temperature dry stem baking process method for flue-cured tobacco
CN109330013A