Method for judging risk and tendency of tobacco smoldering based on balanced moisture content equation

Abstract

A detection method for determining the risk and trend of smoldering in tobacco leaves based on the equilibrium moisture content equation includes the following steps: Step 1: Distribute three temperature sensors from top to bottom in a tobacco stack, respectively t 1i , t 2i , t 3i The summation and average of the three temperatures yields the characteristic temperature value (t) representing the entire tobacco stack. 1i +t 2i +t 3i ) / 3=t i Step 2: Install a weight sensor under the support plate below each tobacco stack to detect changes in the weight of the tobacco stack. Record the initial weight of the tobacco stack as m0, and the weight change of the tobacco stack as m. i Step 3: Before placing each tobacco stack, determine its initial moisture content M0; Step 4: Install a temperature and humidity sensor in the overall environment of the tobacco stack to detect changes in temperature and relative humidity; This invention detects the smoldering state of tobacco leaves by comprehensively judging the dynamic changes in temperature, humidity, and moisture content of the tobacco stack and the possibility of smoldering, effectively improving detection accuracy and avoiding the influence of external environmental factors, saving both time and effort; The method of this invention has the advantages of accurate detection results and ingenious design.

Description

Technical Field

[0001] This invention relates to a detection method for determining the risk and trend of smoldering in tobacco leaves based on the equilibrium moisture content equation. Background Technology

[0002] According to various standards for cigarette storage, tobacco companies have long relied on steel rulers and smoldering racks as the technical tools for detecting cigarette extinguishing. The detection process is primarily manual, which is susceptible to various factors, leading to poor error judgment. Furthermore, it's difficult to ensure the cigarettes being tested are unaffected by environmental factors such as airflow, and there is a risk of fire during the process. While various detection methods exist, they suffer from insufficient accuracy and inconvenience. Therefore, we have developed a detection method based on the equilibrium moisture content equation to determine the risk and trend of smoldering in tobacco leaves. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a detection method for judging the risk and trend of smoldering in tobacco leaves based on the equilibrium moisture content equation, which includes the following steps: Step 1: Distribute three temperature sensors from top to bottom in a tobacco stack, respectively. The summation and average of the three temperatures yields the characteristic temperature value representing the entire tobacco stack. ; Step 2: Install a weight sensor under the support plate below each tobacco stack to detect changes in the weight of the tobacco stack. Record the initial weight of the tobacco stack as... The weight change of the tobacco stack was recorded as follows ; Step 3: Before placing each tobacco stack, determine its initial moisture content. ; Step 4: Install a temperature and humidity sensor within the overall environment of the tobacco stack to detect changes in temperature and relative humidity, and record them as follows: Let i be the number of times data is detected every hour or every day. If the dry tobacco leaf mass of the tobacco stack remains constant throughout the storage period, then the initial mass of the tobacco stack, the system-detected mass, and the initial moisture content are:

[0004] Right now:

[0005] During the i-th system test, the equilibrium moisture content of the tobacco stack and the wet basis moisture content are used to characterize the moisture content of the tobacco stack. The equilibrium moisture content equation for tobacco leaves is:

[0006] Where A = 0.001042, B = 176.288428, n = 0.659412; Combination Calculation , Characterized by the tobacco leaf activity detected at time i in the tobacco stack.

[0007]

[0008] Tobacco leaf activity is also expressed as:

[0009] , represents the moisture pressure in the tobacco stack at time i; Let be the saturation pressure of the moisture in the tobacco stack at time i: in,

[0010] Then we can obtain

[0011] The system detects changes in the ambient temperature and relative humidity of the tobacco stack, which are recorded as follows: The partial pressure of water vapor in the environment can be obtained using the following formula. ,

[0012]

[0013] , represents the moisture pressure in the tobacco stack environment at time i; Let represent the saturation pressure of moisture in the tobacco stack environment at time i. Compare and , like The system continues to operate, and there is no smoldering in the smoke stack environment; like If this occurs, the system will immediately sound an alarm, indicating that there is a possibility of smoldering in the smoke stack environment, prompting a manual on-site inspection of the smoke stack.

[0014] Furthermore, in step four, a wet-bulb and dry-bulb temperature sensor is used for detection, and the dry-bulb temperature is recorded by the sensor. and wet-bulb temperature Then the following formula can be used to calculate. ,

[0015] .

[0016] Furthermore, the room where the tobacco leaves are stored contains multiple tobacco stacks, and these multiple tobacco stacks are further averaged and optimized to determine a parameter that characterizes the probability of smoldering occurring in the entire tobacco stack room.

[0017] Compared with the prior art, the advantages of this invention are: by adopting the above technical solution, this invention can detect the smoldering state of tobacco leaves by comprehensively judging the dynamic changes of temperature, humidity, moisture content and the possibility of smoldering in the tobacco stack, which can effectively improve the detection accuracy and avoid the influence of external environmental factors, thus saving time and effort; the method of this invention has the advantages of accurate detection results and ingenious design. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Specific names are used in the foregoing description to provide a thorough understanding of the embodiments. Preferably, a detection method for determining the risk and trend of smoldering in tobacco leaves based on an equilibrium moisture content equation is provided, comprising the following steps: First, three temperature sensors are distributed from top to bottom in a smoke stack, namely... The summation and average of the three temperatures yields the characteristic temperature value representing the entire tobacco stack. ; A weight sensor is then installed under the support plate beneath each tobacco stack to detect changes in the stack's weight. The initial weight of the tobacco stack is recorded as... The weight change of the tobacco stack was recorded as follows ; Furthermore, the initial moisture content of each tobacco stack was measured before placement. ; Then, a temperature and humidity sensor is installed within the overall environment of the tobacco stack to detect changes in temperature and relative humidity, which are recorded as follows: .

[0019] Based on the above method, when the time is set to 1 hour or 1 day, data is measured once and denoted as i. In specific implementation, assuming that the mass of dry tobacco leaves in the tobacco stack remains constant throughout the storage period, given the initial mass of the tobacco stack, the mass measured by the system, and the initial moisture content, we can obtain: (1) Right now: (2) During the i-th system test, the equilibrium moisture content of the tobacco stack and the wet basis moisture content are characterized.

[0020] The equilibrium moisture content equation for tobacco leaves is given as follows: (3) Where A=0.001042, B=176.288428, n=0.659412; Combination Calculation , Characterized by the tobacco leaf activity detected at time i in the tobacco stack.

[0021] (4) Since tobacco leaf activity can also be expressed as, (5) , represents the moisture pressure in the tobacco stack at time i; Let represent the saturation pressure of moisture in the tobacco stack at time i.

[0022] in, (6) Then we can get (7) Since the system detects changes in the ambient temperature and relative humidity of the tobacco stack, it is denoted as... The partial pressure of water vapor in the environment can be obtained using the following formula. , (8) (9) , represents the moisture pressure in the tobacco stack environment at time i; Let represent the saturation pressure of moisture in the tobacco stack environment at time i.

[0023] Compare and , like The system continues to operate, and there is no smoldering in the smoke stack environment; like If this occurs, the system will immediately sound an alarm, indicating a possible smoldering in the smoke stack environment, and a manual on-site inspection of the smoke stack will be conducted.

[0024] Based on the above implementation method, other implementation methods may be implemented.

[0025] When detecting ambient temperature and humidity, a wet-bulb and dry-bulb temperature sensor can also be used for detection. The dry-bulb temperature is recorded by the wet-bulb and dry-bulb temperature sensor. and wet-bulb temperature Then the following formula can be used to calculate. , (8) (9) The above content only provides the probability of smoldering in a single tobacco stack. However, in a room storing tobacco leaves, there may be n (or more) tobacco stacks. Further averaging and optimization can be performed on these n stacks to determine a parameter that characterizes the entire tobacco stack room. An automated tobacco smoldering detection method based on a moisture content equilibrium equation is used to detect the possibility of smoldering in tobacco stacks. The method determines whether the set values ​​are suitable. Temperature, humidity, and weight are used to calculate moisture content, water pressure, and other parameters for comprehensive judgment. The detection accuracy is high, avoiding the influence of external environmental factors, saving both time and effort. This invention has the advantages of accurate detection results and ingenious design.

[0026] However, it will be apparent to those skilled in the art that specific details are not required to practice the described embodiments. Those skilled in the art should understand that the present invention is not limited to the specific embodiments described above, and improvements and substitutions based on the present invention using techniques known in the art all fall within the scope of protection of the present invention and should be defined by the claims.

Claims

1. A detection method for determining the risk and trend of smoldering in tobacco leaves based on the equilibrium moisture content equation, characterized in that, It includes the following steps: Step 1: Distribute three temperature sensors from top to bottom in a tobacco stack, respectively. The summation and average of the three temperatures yields the characteristic temperature value representing the entire tobacco stack. ; Step 2: Install a weight sensor under the support plate below each tobacco stack to detect changes in the weight of the tobacco stack. Record the initial weight of the tobacco stack as... The weight change of the tobacco stack was recorded as follows ; Step 3: Before placing each tobacco stack, determine its initial moisture content. ; Step 4: Install a temperature and humidity sensor within the overall environment of the tobacco stack to detect changes in temperature and relative humidity, and record them as follows: Let i be the number of times data is detected every hour or every day. If the dry tobacco leaf mass of the tobacco stack remains constant throughout the storage period, then the initial mass of the tobacco stack, the system-detected mass, and the initial moisture content are: Right now: During the i-th system test, the equilibrium moisture content of the tobacco stack and the wet basis moisture content are used to characterize the moisture content of the tobacco stack. The equilibrium moisture content equation for tobacco leaves is: Where A = 0.001042, B = 176.288428, n = 0.659412; Combination Calculation , Characterized by the tobacco leaf activity detected at time i in the tobacco stack; Tobacco leaf activity is also expressed as: , represents the moisture pressure in the tobacco stack at time i; Let be the saturation pressure of the moisture in the tobacco stack at time i: in, Then we can obtain The system detects changes in the ambient temperature and relative humidity of the tobacco stack, which are recorded as follows: The partial pressure of water vapor in the environment can be obtained using the following formula. , , represents the moisture pressure in the tobacco stack environment at time i; Let represent the saturation pressure of moisture in the tobacco stack environment at time i. Compare and , like The system continues to operate, and there is no smoldering in the smoke stack environment; like If this occurs, the system will immediately sound an alarm, indicating that there is a possibility of smoldering in the smoke stack environment, prompting a manual on-site inspection of the smoke stack.

2. The detection method for determining the risk and trend of smoldering in tobacco leaves based on the equilibrium moisture content equation according to claim 1, characterized in that: In step four, a wet-bulb and dry-bulb temperature sensor is used for detection, and the dry-bulb temperature is recorded by the sensor. and wet-bulb temperature Then the following formula can be used to calculate. , 。 3. The detection method for determining the risk and trend of smoldering in tobacco leaves based on the equilibrium moisture content equation according to claim 2, characterized in that: The room where tobacco leaves are stored contains multiple tobacco stacks. These multiple tobacco stacks are then averaged and optimized to determine a parameter that characterizes the likelihood of smoldering occurring within the entire tobacco stack room.

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