Online analysis device for heat and humidity treatment characteristics of tobaccos

Abstract

The utility model discloses an on-line analysis device for tobacco heat and humidity treatment characteristics. The on-line analysis device comprises a convection drying test assembly and a heat and humidity control assembly communicated with the convection drying test assembly, the convection drying test assembly comprises a nuclear magnetic sample cavity and magnets annularly arranged on the periphery of the nuclear magnetic sample cavity, and a plurality of closely arranged nuclear magnetic magnet coils are arranged at the axis of the magnets to form a test cavity for bearing tobacco samples; the heat and humidity control assembly comprises a heating control unit and a humidification control unit which are communicated to the nuclear magnetic sample cavity, the heating control unit is used for heating a sample in the test cavity, and the humidification control unit is used for providing stable temperature and humidity conditions for the test cavity. The device can provide a stable atmosphere environment condition for a convection drying test, is favorable for obtaining the dynamic change condition of data such as nuclear magnetic semaphore and sample temperature of a tobacco sample along with time, and provides data support for tobacco drying moisture research.

Description

Technical Field

[0001] The utility model relates to the field of tobacco drying, in particular to an online analysis device for tobacco heat and moisture treatment characteristics based on low-field nuclear magnetic resonance. Background Art

[0002] Tobacco is a colloid capillary porous substance, its organizational structure is composed of capillaries and porous bodies, containing colloidal substances such as pectin and protein and hydrophilic crystalline substances such as water-soluble sugars and organic acid salts. Therefore, tobacco exhibits extremely sensitive moisture absorption and desorption properties, and has the function of absorbing and losing water.

[0003] The moisture content in tobacco materials is an indicator that the tobacco industry pays great attention to. It is an important factor affecting cigarette processing, production, storage, transportation, and sensory evaluation. The amount of moisture is not only closely related to the physical properties of tobacco materials (such as filling value, processing resistance, density, elasticity, etc.), but also affects the burning characteristics of cigarettes and the taste of smoking. Therefore, moisture is the main basis for controlling the process links such as rehumidification and drying of tobacco materials and adjusting the processing intensity. The drying process of tobacco is one of the key processes in tobacco processing. Studying the moisture content in the drying process can provide basic data for equipment parameter optimization and process control.

[0004] Tobacco drying research has long been highly valued by tobacco workers, but current research on tobacco drying is mostly for application in cigarette industrial production, and related research mostly remains at the macro level of tobacco. However, there are few studies on the real-time changes of water in different states during tobacco drying and the laws of internal moisture migration changes.

[0005] Nuclear magnetic resonance (NMR) is a real-time, non-destructive, non-invasive quantitative measurement technology that can reflect multiple index parameters such as the moisture content and moisture distribution state of agricultural products from a microscopic perspective, and has attracted widespread attention from scholars at home and abroad in the field of food science research.

[0006] However, at present, the relevant research on detecting the moisture content and state distribution of materials based on low-field nuclear magnetic resonance technology is only a static detection, while the actual production process is a dynamic process. There are no reports on the research on drying tobacco materials under certain hot and humid conditions, real-time online detection of tobacco drying process characteristics and dynamic moisture content and its state distribution during the drying process. Summary of the invention

[0007] In order to solve the above problems, the utility model provides an online analysis device for tobacco heat and moisture treatment characteristics based on low-field nuclear magnetic resonance. The device can provide a stable atmosphere environment condition for convection drying test, which is conducive to obtaining the dynamic change of tobacco sample nuclear magnetic signal quantity and sample temperature data over time, and provides data support for tobacco drying moisture research.

[0008] The technical solution adopted by the utility model to solve its technical problems is:

[0009] Tobacco heat and moisture treatment characteristics online analysis device, including

[0010] A convection drying test assembly and a heat and moisture control assembly connected thereto;

[0011] The convection drying test assembly includes a nuclear magnetic sample chamber and a magnet arranged in a ring around the chamber, a plurality of closely arranged nuclear magnetic coils are arranged at the axis of the magnet to form a test chamber for carrying tobacco samples, a temperature and humidity probe is installed in the nuclear magnetic coil, and the magnet is connected to a nuclear magnetic resonance unit;

[0012] The heat and humidity control component includes a heating control unit and a humidification control unit connected to the nuclear magnetic resonance sample chamber. The heating control unit is used to heat the sample in the test chamber, and the humidification control unit is used to provide stable temperature and humidity conditions for the test chamber.

[0013] As an improvement of the above technical solution, the nuclear magnetic coil is connected to a heat conduction unit;

[0014] The heat conduction unit includes a semiconductor heat dissipation pipeline connected to the nuclear magnetic magnet coil and a low-temperature constant temperature bath, which prevents the magnet coil from being overheated while providing a constant temperature and humidity airflow for the test chamber.

[0015] As an improvement of the above technical solution, the nuclear magnetic resonance unit includes an industrial computer and a spectrometer system that are communicatively connected, and the spectrometer system is connected to the magnet through a radio frequency unit.

[0016] As an improvement of the above technical solution, a switching valve is provided between the heating control unit and the humidification control unit, and the switching valve is connected to the test chamber through a heating pipeline I.

[0017] As an improvement of the above technical solution, the heating control unit includes an air pump I connected to the switching valve, a heating chamber, and a heating pipeline II.

[0018] As an improvement of the above technical solution, the humidification control unit includes a humidity generating device connected to the switching valve and a heating pipeline III, and the humidity generating device is connected to a temperature and humidity controller.

[0019] As an improvement of the above technical solution, the temperature and humidity controller sets the output temperature of the humidity generating device to 30-180°C, the heating temperature to 30-100°C, the test humidity to 10-60% RH and waits for stabilization.

[0020] As an improvement of the above technical solution, the humidity generating device is respectively connected to an air pump II, a flow valve and distilled water, and a peristaltic pump.

[0021] As an improvement of the above technical solution, the heating pipeline I is provided with an air pump III and a temperature and humidity sensor at the bottom side of the nuclear magnetic sample chamber.

[0022] Beneficial effects brought by the utility model:

[0023] The utility model provides an online analysis device for tobacco heat and moisture treatment characteristics, which can provide stable atmosphere and environmental conditions for tobacco convection drying tests: the heating control unit generates airflow through an air pump I, and then heats the airflow through a heating chamber, and then the airflow enters a nuclear magnetic coil to heat the sample; the humidification control unit mainly provides air source and water source through distilled water and an air pump II, and then generates water vapor through mixing through a humidity generator, controls the humidity and temperature of the water vapor through a temperature and humidity controller, and then enters the nuclear magnetic coil to provide stable temperature and humidity conditions.

[0024] When the stable atmosphere environment set in the test is reached (temperature, relative humidity and air velocity, with a deviation within ±0.5℃), a certain amount of sample is weighed and placed in the test chamber for convection drying test, and the changes of sample nuclear magnetic resonance signal and sample temperature and other data over time are recorded online; after drying, the sample is taken out and the next test sample is loaded or the device parameters are adjusted for the next test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Figure 1 It is a structural schematic diagram of the utility model.

[0027] Numbers in the figure:

[0028] 1-distilled water; 2-peristaltic pump; 3-0~2-air pumps I~III; 4-flow valve; 5-humidity generator; 6-temperature and humidity controller; 7-heating chamber; 8-switching valve; 9-temperature and humidity sensor; 10-magnet; 11-nuclear magnetic coil; 12-RF unit; 13-spectrometer system; 14-industrial computer; 15-heating pipeline I; 16-heating pipeline III; 17-low temperature constant temperature bath; 18-heating pipeline II. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the utility model and the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Reference Figure 1This embodiment describes an online analysis device for tobacco heat and moisture treatment characteristics, which mainly includes a convection drying test component and a heat and moisture control component connected thereto.

[0031] The convection drying test assembly is used to perform a convection drying test based on a nuclear magnetic resonance device, so as to obtain test data of the change of moisture and sample temperature over time during the drying process of the test sample in the nuclear magnetic resonance sample chamber through the test. The assembly mainly includes a nuclear magnetic resonance sample chamber and a magnet 10 arranged in a ring shape on its periphery. A certain number of closely arranged nuclear magnetic coils 11 are arranged at the axis of the hollow magnet 10. These circular coils are coiled in sequence and finally form a columnar test chamber that can be used to carry tobacco samples. The temperature and humidity probe located at one end of the nuclear magnetic coil 11 is always located in the test chamber, and is used to obtain the temperature change data near the surface of the sample over time during the drying process.

[0032] The magnet 10 is responsible for providing a uniform and stable main magnetic field, and is connected to a nuclear magnetic resonance device. In this embodiment, the nuclear magnetic resonance device uses the existing NMI20-060H-I nuclear magnetic resonance imaging analyzer, and only a basic introduction is given below. It mainly includes an industrial computer 14 and a spectrometer system 13 that are connected in communication, wherein the industrial computer 14 can be a main control computer, which is responsible for receiving the operator's instructions and transmitting control signals to the various components of the spectrometer system 13 to coordinate work, and simultaneously performs tasks such as data processing, storage and display; the spectrometer system 13 is used to process the instructions of the industrial computer 14, and to perform real-time control of the entire process of the instrument acquiring nuclear magnetic resonance signals; the spectrometer system 13 is connected to the magnet 10 through the radio frequency unit 12, and the radio frequency unit 12 is mainly responsible for the emission of the radio frequency pulse sequence and the reception of the sampling signal. Regarding the nuclear magnetic resonance device, please refer to the existing information for any incomplete information.

[0033] The main function of the heat and humidity control component is to provide a stable test atmosphere environment condition in the nuclear magnetic sample chamber. It includes a heating control unit and a humidification control unit connected to the nuclear magnetic sample chamber. A switching valve 8 is provided between the heating control unit and the humidification control unit, which can be used to switch the heat and humidity treatment control. The switching valve 8 is connected to the test chamber through a heating pipeline I15.

[0034] The heating control unit is used to heat the sample in the test chamber, including an air pump I3-0 connected to the switching valve 8, a heating chamber 7, and a heating pipeline II18. The air pump I3-0 generates air pressure through electricity to provide airflow, and the heating chamber 7 heats the airflow generated by the air pump and transports it to the test chamber through the heating pipeline II18, the switching valve 8, and the heating pipeline I15.

[0035] The humidification control unit is used to provide stable test temperature and humidity conditions for the test chamber, including a humidity generator 5 connected to a switching valve 8 and a heating pipeline III16. The humidity generator 5 is connected to a temperature and humidity controller 6, through which the temperature and humidity of the water vapor generated by the humidity generator 5 are set and controlled. The humidity generator 5 is also connected to an air pump II3-1, a flow valve 4, distilled water 1, and a peristaltic pump 2 respectively; the air pump II3-1 and the peristaltic pump 2 adjust the amount of gas and liquid entering, so that the gas and distilled water 1 enter the humidity generator 5 evenly. After the gas and distilled water 1 are fully mixed, the humidity generator 5 heats them through its internal vaporizer so that they are output as stable and uniform water vapor.

[0036] In this embodiment, the NMR coil 11 is connected to a heat conduction unit to provide the probe with heat insulation function. The heat conduction unit includes a semiconductor heat dissipation pipeline connected to the NMR coil 11 and a low temperature constant temperature tank 17 to provide a constant low temperature for the coil to prevent the coil from being overheated.

[0037] In this embodiment, the heating pipeline I15 is provided with an air pump III3-2 and a temperature and humidity sensor 9 at the bottom inlet side of the nuclear magnetic sample chamber. The airflow generated by the air pump III3-2 can be transported to the interlayer added to the inner circle of the nuclear magnetic coil 11 (the inner side of the interlayer is the test chamber) for heat insulation of the nuclear magnetic coil 11. The temperature and humidity sensor 9 is used to monitor the temperature and humidity of the gas in the pipeline here. The main function of each heating pipeline is to maintain the temperature of the gas in the pipeline, and to prevent the gas temperature from decreasing and condensing by external heating.

[0038] The following introduces the operation process of the on-line analysis device for tobacco heat and moisture treatment characteristics.

[0039] First, pre-treat the tobacco samples. If the tobacco samples are tobacco leaves or large tobacco sheets, they can be processed into uniform small pieces or other shapes; cut tobacco samples do not need to be processed. Weigh several test samples of equal mass, add different amounts of water to form samples with different initial moisture content, and place them in a constant temperature and humidity chamber for sealed storage for test use.

[0040] Then start the heat and humidity control component. When the NMR sample chamber reaches the stable atmosphere environment set for the test (temperature, relative humidity and air velocity, with a deviation within ±0.5°C), weigh a certain amount (about 2.0g) of sample and put it into the test chamber. Start the NMR equipment to perform a convection drying test, and record online the changes in data such as the sample NMR signal and sample temperature over time.

[0041] When drying is completed (the sample NMR signal no longer changes and the sample moisture reaches a balanced state under the test conditions), take out the sample and load the next test sample or adjust the device parameters for the next test.

[0042] Finally, the test data were collated and analyzed to study the moisture content in the tobacco drying process.

[0043] The specific process of heat and moisture control by the online analysis device for tobacco heat and moisture treatment characteristics is as follows:

[0044] 1. Heating operation process

[0045] 1. Turn on the heat transfer unit and connect the low temperature constant temperature bath 17 with the semiconductor heat dissipation pipeline;

[0046] 2. Switch the switching valve 8 to the heating state to make it conductive;

[0047] 3. Start the heating control unit and set the heating temperature;

[0048] 2. Humidification operation process

[0049] 1. Turn on the heat transfer unit and connect the low temperature constant temperature bath 17 with the semiconductor heat dissipation pipeline;

[0050] 2. Switch the switching valve 8 to the humidification state and shut it off;

[0051] 3. Start the humidification control unit and set the temperature and humidity:

[0052] Set the temperature of humidity generator 5 to 130°C and the heating temperature to 80°C;

[0053] Set the experimental humidity to 60% RH and wait for it to stabilize before conducting the test.

[0054] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An online analysis device for tobacco heat and moisture treatment characteristics, characterized in that: include A convection drying test assembly and a heat and moisture control assembly connected thereto; The convection drying test assembly includes a nuclear magnetic sample chamber and a magnet arranged in a ring around the chamber, a plurality of closely arranged nuclear magnetic coils are arranged at the axis of the magnet to form a test chamber for carrying tobacco samples, a temperature and humidity probe is installed in the nuclear magnetic coil, and the magnet is connected to a nuclear magnetic resonance unit; The heat and humidity control component includes a heating control unit and a humidification control unit connected to the nuclear magnetic resonance sample chamber. The heating control unit is used to heat the sample in the test chamber, and the humidification control unit is used to provide stable temperature and humidity conditions for the test chamber.

2. The on-line analysis device for tobacco heat and moisture treatment characteristics according to claim 1, characterized in that: The nuclear magnetic coil is connected to a heat conduction unit; The heat conduction unit comprises a semiconductor heat dissipation pipeline connected to the nuclear magnetic coil and a low-temperature constant temperature tank.

3. The on-line analysis device for tobacco heat and moisture treatment characteristics according to claim 1, characterized in that: A switching valve is provided between the heating control unit and the humidification control unit, and the switching valve is connected to the test chamber through a heating pipeline I.

4. The on-line analysis device for tobacco heat and moisture treatment characteristics according to claim 3, characterized in that: The heating control unit includes an air pump I connected to a switching valve, a heating chamber, and a heating pipeline II.

5. The on-line analysis device for tobacco heat and moisture treatment characteristics according to claim 3, characterized in that: The humidification control unit includes a humidity generating device connected to the switching valve and a heating pipeline III, and the humidity generating device is connected to a temperature and humidity controller.

6. The on-line analysis device for tobacco heat and moisture treatment characteristics according to claim 5, characterized in that: The temperature and humidity controller sets the output temperature of the humidity generating device to 30-180°C, the heating temperature to 30-100°C, the test humidity to 10-60%RH and waits for stabilization.

7. The on-line analysis device for tobacco heat and moisture treatment characteristics according to claim 5, characterized in that: The humidity generating device is respectively connected with an air pump II, a flow valve, distilled water and a peristaltic pump.

8. The on-line analysis device for tobacco heat and moisture treatment characteristics according to claim 3, characterized in that: The heating pipeline I is provided with an air pump III and a temperature and humidity sensor at the bottom side of the nuclear magnetic sample chamber.

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