A method for improving moisture stability at tobacco sheet feeding outlet

Abstract

The present invention discloses a method for improving the moisture stability of the tobacco slice feeding outlet, the method comprising the following steps: 1. optimizing the hot air temperature control mode when the feeder is in production state, optimizing and adjusting the hot air temperature mode controlled by the jet steam valve opening PID regulation to a fixed jet steam valve opening, and the heat exchanger opening PID regulation to control the hot air temperature mode; 2. determining the fixed jet steam valve opening range according to the situation of the cylinder wall adhesion during the feeding process of the feeder; 3. determining the fixed jet steam valve opening according to the comprehensive evaluation of the hot air temperature and outlet moisture stability of the feeder. The method of the present invention can avoid the fluctuation of the moisture content within and between batches caused by the jet steam valve opening adjustment process without changing the original feeder equipment structure and device, by optimizing the hot air temperature control mode when the feeder is in production state, optimizing the process and equipment parameters, and at the same time ensuring the stability of the hot air temperature and the moisture content of the feeding outlet during the tobacco slice feeding process, thereby improving the product homogenization processing capability.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco slice feeding, and in particular to a method for improving moisture stability at a tobacco slice feeding outlet. Background Art

[0002] As a special process in the production of tobacco leaves, the main process task of tobacco leaf feeding is to accurately and evenly apply the liquid feed to the tobacco leaves according to the formula to improve the sensory and physical properties of the tobacco leaves. The moisture at the outlet of the tobacco leaf feeding not only affects the sensory quality of cigarette products, but also has a very important impact on the stability of the subsequent leaf drying process. In the existing tobacco leaf feeding process, the feeder provides hot air of a certain temperature through the hot air system to ensure that the tobacco leaves absorb the liquid feed evenly. However, the control mode of the hot air system of the feeder in the tobacco industry is generally to use dry medium heating when the feeder is preheated, and to use steam to directly apply to the hot air to control the hot air temperature within the set value range when switching to the production state. Although this method can ensure the stability of the hot air temperature during the feeding process and form a certain humidity environment in the drum, which is beneficial to the absorption of liquid by the tobacco slices, the hot air temperature is controlled by adjusting the valve opening of the jet steam applied to the hot air during production. This can easily lead to moisture head phenomenon at the feeding outlet in the head stage. At the same time, the production and processing process is affected by the external environment and seasonal climate. Maintaining the stability of the hot air temperature by adjusting the amount of steam applied will also bring about fluctuations in moisture at the feeding outlet within and between batches, thereby affecting the moisture content of the incoming materials in the next drying process and causing inconsistency in the processing intensity of the drying process. Summary of the invention

[0003] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides a method for improving the moisture stability of tobacco slices at a feeding outlet. Under the premise of not changing the original structure of the feeder equipment, the method fixes the opening of the jet steam valve at a more appropriate value, adjusts the heat exchanger within a reasonable range, ensures the stability of the hot air temperature, and simultaneously solidifies the increase in moisture of the tobacco slices brought about by the application of the jet steam, effectively avoids the fluctuation of moisture within and between batches caused by the adjustment process of the opening of the jet steam valve, improves the stability of the moisture at the feeding outlet of the tobacco slices, and thereby improves the homogenization processing capability of the product.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for improving the moisture stability of a tobacco sheet feeding outlet comprises the following steps:

[0006] Step 1: Optimize the hot air temperature control mode when the feeder is in production state, and change the existing heat exchanger not involved in the control, the injection steam valve opening PID regulation control hot air temperature mode to a fixed injection steam valve opening, heat exchanger opening PID regulation control hot air temperature mode;

[0007] Step 2: Determine the appropriate fixed jet steam valve opening range according to the influence of different jet steam valve fixed openings on the cylinder wall adhesion during the charging process of the feeder, to prevent the jet steam valve fixed opening from being too large or too small, causing excessive cylinder wall adhesion, resulting in excessive production consumption in the charging process;

[0008] Step 3: Within the appropriate fixed jet steam valve opening range determined in step 2, determine the fixed jet steam valve opening based on a comprehensive evaluation of the hot air temperature of the feeder and the outlet moisture stability, effectively avoiding the intra-batch and inter-batch moisture fluctuations caused by the jet steam valve opening adjustment process.

[0009] Further, preferably, in step 2, the suitable fixed steam injection valve opening range is ≦70%, and the loss ratio of the cylinder wall adhesion during the feeding process of the feeder is less than 0.02%;

[0010] Furthermore, preferably, in step 3, the fixed jet steam valve opening is 55%, and the heat exchanger opening PID adjustment range is 30-50%, which can simultaneously ensure the stability of the hot air temperature and the moisture at the feeding outlet during the tobacco sheet feeding process.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] Under the premise of not changing the original structure of the feeder equipment, the present invention optimizes the hot air temperature control mode when the feeder is in production state, optimizes the process and equipment parameters, and can avoid the fluctuation of moisture content within and between batches caused by the adjustment process of the opening of the injection steam valve. After the improvement, the SD value of the moisture content at the feeder outlet is reduced from 0.11% to 0.04%, which effectively improves the stability of the moisture content at the feeder outlet. Implementation

[0013] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0014] A method for improving the moisture stability of a tobacco sheet feeding outlet of the present invention comprises the following specific steps:

[0015] Step 1: Optimize the hot air temperature control mode when the feeder is in production state. The existing heat exchanger does not participate in the control. The hot air temperature mode controlled by the PID adjustment of the jet steam valve opening is optimized and adjusted to a fixed jet steam valve opening, and the hot air temperature mode is controlled by the PID adjustment of the heat exchanger opening.

[0016] Step 2: Determine the appropriate fixed jet steam valve opening range based on the effect of different jet steam valve fixed openings on cylinder wall adhesion during the charging process of the feeder to prevent the jet steam valve fixed opening from being too large or too small, causing excessive cylinder wall adhesion and resulting in excessive production consumption in the charging process.

[0017] The specific process is as follows:

[0018] Taking the determination of the appropriate fixed steam jet valve opening range in the charging process of Jiangxi Zhongyan Jinsheng (Hard Red. Zodiac) brand tobacco as an example, the weight of a batch of tobacco leaves of this brand is 4000Kg, and the influence of different fixed openings of the steam jet valve on the cylinder wall adhesion is tested. The moisture content of the cylinder wall adhesion in the charging process is measured, and the weight of the adhesion is converted into the standard weight. The results are shown in the following table:

[0019] Fixed opening of jet steam valve (%) Standard weight of cylinder wall adhesion during feeding process (Kg) 30 0.58 40 0.61 50 0.63 60 0.66 70 0.70 80 0.88

[0020] It can be found from the above table that as the fixed opening of the jet steam valve gradually increases from 30% to 70%, the standard weight of the cylinder wall adhesion in the feeding process also shows a slowly increasing trend. However, when the fixed opening of the jet steam valve increases to 80%, the standard weight of the cylinder wall adhesion increases sharply to 0.88Kg. Therefore, the appropriate fixed jet steam valve opening range is ≦70%, and the loss ratio of the cylinder wall adhesion during the feeding process of the feeder is less than 0.02%.

[0021] Step 3: Within the appropriate fixed jet steam valve opening range, determine the fixed jet steam valve opening based on a comprehensive evaluation of the hot air temperature of the feeder and the outlet moisture stability, effectively avoiding the intra-batch and inter-batch moisture fluctuations caused by the jet steam valve opening adjustment process.

[0022] The specific process is as follows:

[0023] Taking the determination of the fixed jet steam valve opening in the tobacco leaf feeding process of Jiangxi Zhongyan Jinsheng (Hard Red. Zodiac) brand as an example, the weight of a batch of tobacco leaves of this brand is 4000Kg. The influence of different fixed jet steam valve openings on the hot air temperature and outlet moisture stability of the feeder is tested. The results are shown in the table below:

[0024] Fixed opening of jet steam valve (%) Hot air temperature SD value (℃) Export moisture SD value (%) 30 0.20 0.10 40 0.15 0.09 50 0.10 0.06 55 0.06 0.04 60 0.08 0.05 65 0.10 0.06 70 0.11 0.06

[0025] It can be seen from the above table that, based on the comprehensive evaluation of the stability of the hot air temperature and outlet moisture of the feeder, and considering the rationality of the heat exchanger adjustment range, when the opening of the fixed steam injection valve is 55%, the stability of the hot air temperature and the moisture at the feed outlet during the tobacco sheet feeding process can be better guaranteed. Under this condition of the opening of the steam injection valve, the PID adjustment range of the heat exchanger of the feeder is between 30% and 50%.

[0026] In summary, the method of the present invention can avoid the fluctuation of moisture content within and between batches caused by the adjustment of the opening of the jet steam valve without changing the original structure of the feeder equipment, by optimizing the hot air temperature control mode during the production state of the feeder, and optimizing the process and equipment parameters. At the same time, the stability of the hot air temperature and the moisture content at the feed outlet during the feeding process of the tobacco slices is guaranteed, and the SD value of the moisture content at the feed outlet is reduced from 0.11% to 0.04%, which effectively improves the product homogenization processing capacity.

[0027] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for improving the moisture stability of tobacco sheet feeding outlet, characterized in that: The steps include: Step 1: Optimize the hot air temperature control mode when the feeder is in production state, and change the existing heat exchanger not involved in the control, the injection steam valve opening PID regulation control hot air temperature mode to a fixed injection steam valve opening, heat exchanger opening PID regulation control hot air temperature mode; Step 2: Determine the appropriate fixed jet steam valve opening range according to the influence of different jet steam valve fixed openings on the cylinder wall adhesion during the charging process of the feeder, to prevent the jet steam valve fixed opening from being too large or too small, causing excessive cylinder wall adhesion, resulting in excessive production consumption in the charging process; Step 3: Within the appropriate fixed jet steam valve opening range determined in step 2, the fixed jet steam valve opening is determined based on a comprehensive evaluation of the hot air temperature of the feeder and the outlet moisture stability, effectively avoiding the intra-batch and inter-batch moisture fluctuations caused by the jet steam valve opening adjustment process; In the above step 2, the suitable fixed jet steam valve opening range is ≦70%, and the loss ratio of the cylinder wall adhesion during the charging process of the charging machine is less than 0.02%; In the above step 3, the fixed jet steam valve opening is 55%, and the heat exchanger opening PID adjustment range is 30~50%, which can simultaneously ensure the stability of the hot air temperature and the moisture content at the feeding outlet during the tobacco sheet feeding process.