Method for determining pressure intensity of steam explosion pretreatment of tobacco stems

Abstract

The invention provides a method for determining tobacco stem steam explosion pretreatment pressure intensity. The method comprises the following steps that (1) the filling amount of tobacco stem materials is determined according to the capacity of a steam explosion equipment reactor; (2) determining the dwell time t, min of the reactor; (3) determining the size of a blasting factor R according to the requirements of the tobacco stems after steam blasting pretreatment; (4) calculating the pressure intensity P and MPa according to the following formula; r is equal to-0.395 + 1.135 p / 3.06; and (5) the obtained value p is the pressure intensity of the steam explosion pretreatment of the tobacco stems. According to the determination method, the tobacco stem steam explosion pretreatment pressure is determined according to different materials and the requirements of products after steam explosion, and the method is simple, rapid, efficient and accurate.

Description

Technical Field

[0001] The invention belongs to the field of tobacco stem processing, and in particular relates to a method for determining the pretreatment pressure of tobacco stem steam explosion. Background Art

[0002] Steam explosion technology refers to a physical and chemical treatment technology that processes materials under high-temperature and high-pressure steam for a period of time, and then releases the pressure instantly within 0.01s to achieve "explosion", converts heat energy into mechanical energy to do work, and steam acts on the material in the form of shock waves to change its structural composition. Through the thermochemical action of the gas phase cooking process and the physical work of the steam explosion stage, the dense and orderly structure of the material is broken, the accessibility of enzymes and chemical components is increased, and subsequent reactions are easy to carry out. Steam explosion technology has broad development prospects in the food field due to its safety, high efficiency, and environmental protection.

[0003] Researchers have tried the application of steam explosion in the pretreatment of plant fibers. Steam explosion technology provides new ideas for the reuse of waste resources such as straw, wheat straw, wood chips, and tobacco stems. Steam explosion treatment requires the introduction of high-temperature and high-pressure steam, and no other chemical components are added. It can destroy the connection between wood cellulose, not only promoting the release of active ingredients in food materials, but also modifying macromolecular substances, enhancing the corresponding functional properties, and improving extraction efficiency. It has significant effects in the fields of efficient separation of plant fibers and treatment of biomass byproducts.

[0004] At present, although steam explosion technology has been applied in the tobacco stem industry, there is no unified method to evaluate the effect of steam explosion on the integrity of tobacco stems, especially in the high-pressure stem moistening stage of tobacco stem processing, the pressure used in the steam explosion treatment needs to be selected and controlled; but the existing technology does not teach how to determine the pressure in steam explosion.

[0005] The present invention has been proposed to solve the above-mentioned problems. Summary of the invention

[0006] The present invention provides a method for determining the pretreatment pressure of tobacco stems through steam explosion, and selects the intensity of steam explosion according to the degree of change in the appearance structure and silk-making performance of the tobacco stems after steam explosion. The determination method of the present invention provides a technical parameter range for the explosion stage in tobacco stem pretreatment, and provides a basis for selection and adjustment of the steam explosion intensity of the production line in this industry. The determination method of the present invention provides a basis for improving the steam explosion conditions for the preparation of shredded stems, and further improves the resource utilization of tobacco stems. The method of the present invention determines the pretreatment pressure of tobacco stems through steam explosion according to the degree of crushing of the tobacco stems after steam explosion, and has the characteristics of being fast, convenient, efficient, and accurate.

[0007] The present invention provides a method for determining the pretreatment pressure of tobacco stem steam explosion, comprising the following steps:

[0008] (1) Determine the filling amount of tobacco stem material according to the reactor capacity of the steam explosion equipment;

[0009] (2) Determine the reactor pressure holding time t, min;

[0010] (3) Determine the explosion factor R according to the requirements of the tobacco stems after steam explosion pretreatment;

[0011] (4) Calculate the pressure P, MPa, according to the following formula: R = -0.395 + 1.135e p / 3.06 ;

[0012] (5) The p value obtained is the pretreatment pressure of tobacco stem steam explosion.

[0013] Preferably, the moisture content of the tobacco stem material is 15wt% to 35wt%.

[0014] Preferably, the filling amount of tobacco stem material is more than 3 / 4 of the reactor capacity volume.

[0015] Preferably, the reactor pressure holding time t is 3 min to 7 min.

[0016] Preferably, the explosion factor R is 0.82≦R≦0.94.

[0017] Preferably, the tobacco stem steam explosion pretreatment equipment is the QBS-80 model equipment produced by Hebi Zhengdao Bioenergy Company; of course, other equipment can also be used by adjusting the corresponding technical parameters.

[0018] Beneficial effects of the present invention:

[0019] 1. The determination method of the present invention determines the pretreatment pressure of tobacco stem steam explosion according to different materials and the requirements of the product after steam explosion. The method is simple, fast, efficient and accurate. According to the degradation ability of the cellulose component in the tobacco stem cell wall, the larger the value of the explosion factor R, the worse the silk-making ability of the tobacco stem after steam explosion; the smaller the value of the explosion factor R, the tobacco stem cell wall components are basically not degraded; here there is a threshold value for the value of R. Studies have shown that when R≦0.82, the tobacco stem cell wall components are basically not degraded after tobacco stem steam explosion, and the tobacco stem steam explosion strength is low. It is necessary to appropriately increase the steam explosion strength to improve the degradation effect of the tobacco stem cell wall; when R≧0.94, the tobacco stems basically do not have the ability to make silk after tobacco stem steam explosion, and the tobacco stem steam explosion strength is high. It is necessary to appropriately reduce the steam explosion strength to keep the structure of the tobacco stem intact; when and only when 0.82≦R≦0.94, the tobacco stem steam explosion strength is appropriate, the tobacco stem structure is basically not damaged, the integrity is good, and silk can be made. The determination method of the present invention can adjust appropriate steam explosion processing conditions for industrial production lines, effectively reduce the damage to tobacco stems during the steam explosion process of tobacco stems, and thus reduce industrial costs.

[0020] 2. The steam explosion method of the present invention improves the utilization value of tobacco stems and can provide new degradation, transformation and treatment ideas for agricultural resource wastes such as tobacco stems, thereby achieving sustainable development.

[0021] 3. The determination method of the present invention can also test the applicability of steam explosion equipment to tobacco stem processing, providing a wider development path for the application of steam explosion. The tobacco stem steam explosion pretreatment equipment of the present invention is a QBS-80 model equipment produced by Hebi Zhengdao Bioenergy Company; of course, other equipment can also be used by adjusting the corresponding technical parameters. Specific implementation methods

[0023] In order to make the purpose, technical scheme and beneficial effects of the present invention clearer, a detailed description will be given below in conjunction with embodiments to facilitate understanding by technicians.

[0024] Example 1: A method for determining the pretreatment pressure of steam explosion of tobacco stems with a material number of X001 in a certain year; the steam explosion equipment is QBS-80, Hebi Zhengdao Bioenergy Company; the equipment is preheated, the preparation work is completed, and the steam explosion treatment is started, and the specific steps are as follows:

[0025] (1) In the high-pressure tobacco stem moistening section, the average moisture content of the tobacco stems is 30 wt %. 52 g of tobacco stems numbered X001 are weighed, and the volume is 3 / 4 of the volume of the steam explosion equipment reactor;

[0026] (2) Set the holding time to 7 minutes;

[0027] (3) According to the material requirements of tobacco stems after steam explosion, the explosion factor R value is determined to be 0.853;

[0028] (4) According to the following formula R = -0.395 + 1.135e p / 3.06 The calculated pressure P is 0.3MPa;

[0029] Add all the weighed tobacco stems into the equipment reactor and tighten the reactor lid; open the reactor steam valve, and when the pressure in the equipment reactor rises to 0.3MPa, close the steam valve, turn on the timer, and set the pressure holding time to 7min; when the pressure holding time is over, the steam explosion reactor opens instantly and the material is sprayed to the feeding port.

[0030] Analysis of the tobacco stems after steam explosion shows that the structure of the tobacco stems is basically not damaged and the integrity is good, so they can be made into silk.

[0031] Example 2: A method for determining the pretreatment pressure of steam explosion of tobacco stems with a material number of X002 in a certain year; the steam explosion equipment is QBS-80; the equipment is preheated, the preparation work is completed, and the steam explosion treatment is started. The specific steps are as follows:

[0032] (1) In the high-pressure tobacco stem moistening section, the average moisture content of the tobacco stems is 30 wt %. 60 g of tobacco stems numbered X002 are weighed; the volume is 7 / 8 of the volume of the steam explosion equipment reactor;

[0033] (2) Set the holding time to 7 minutes;

[0034] (3) According to the material requirements of tobacco stems after steam explosion, the explosion factor R value is determined to be 0.898;

[0035] (4) According to the following formula R = -0.395 + 1.135e p / 3.06 The calculated pressure P is 0.4 MPa;

[0036] Add all the weighed tobacco stems into the equipment reactor and tighten the reactor lid; open the reactor steam valve, and when the pressure in the equipment reactor rises to 0.4MPa, close the steam valve, turn on the timer, and set the pressure holding time to 7min; when the pressure holding time is over, the steam explosion reactor opens instantly and the material is sprayed to the feeding port.

[0037] Analysis of the tobacco stems after steam explosion shows that the structure of the tobacco stems is basically not damaged and the integrity is good, so they can be made into silk.

[0038] Comparative Example 1: Method for determining the pretreatment pressure of steam explosion of tobacco stems with a material number of X003 in a certain year; the steam explosion equipment is QBS-80; the equipment is preheated, the preparation work is completed, and the steam explosion treatment is started. The specific steps are as follows:

[0039] (1) In the high-pressure tobacco stem moistening section, the average moisture content of the tobacco stems is 30%. 60 g of tobacco stems numbered X003 are weighed; the volume is 3 / 4 of the volume of the steam explosion equipment reactor;

[0040] (2) Set the holding time to 7 minutes;

[0041] (3) According to the material requirements of tobacco stems after steam explosion, the explosion factor R value is determined to be 0.778;

[0042] (4) According to the following formula R = -0.395 + 1.135e p / 3.06 The calculated pressure P is 0.1MPa;

[0043] Add all the weighed tobacco stems into the equipment reactor and tighten the reactor lid; open the reactor steam valve, and when the pressure in the equipment reactor rises to 0.1MPa, close the steam valve, turn on the timer, and set the pressure holding time to 7min; when the pressure holding time is over, the steam explosion reactor opens instantly and the material is sprayed to the feeding port.

[0044] Analysis of the tobacco stems after steam explosion showed that the structure of the tobacco stems was not destroyed, the cell walls of the tobacco stems were basically not degraded, and the appearance color did not change; the steam explosion pressure needs to be increased.

[0045] Comparative Example 2: Method for determining the steam explosion pretreatment strength of tobacco stems with a material number of X004 in a certain year;

[0046] The steam explosion equipment is QBS-80; preheat the equipment, complete the preparation work, and start the steam explosion treatment. The specific steps are as follows:

[0047] (1) In the high-pressure tobacco stem moistening section, the average moisture content of the tobacco stems is 30 wt %. 58 g of tobacco stems numbered X004 are weighed; the volume is 7 / 8 of the volume of the steam explosion equipment reactor;

[0048] (2) Set the holding time to 7 minutes;

[0049] (3) According to the material requirements of tobacco stems after steam explosion, the explosion factor R value is determined to be 1.079;

[0050] (4) According to the following formula R = -0.395 + 1.135e p / 3.06 The calculated pressure P is 0.8MPa;

[0051] Add all the weighed tobacco stems into the equipment reactor and tighten the reactor lid; open the reactor steam valve, and when the pressure in the equipment reactor rises to 0.799MPa, close the steam valve, turn on the timer, and set the pressure holding time to 7min; when the pressure holding time is over, the steam explosion reactor opens instantly and the material is sprayed to the feeding port.

[0052] Analysis of the tobacco stems after steam explosion shows that the structure of the tobacco stems is completely destroyed and the integrity is poor, so they cannot be used for tobacco making. The steam explosion intensity is too high, so the steam explosion pressure needs to be reduced.

[0053] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for determining the pretreatment pressure of tobacco stem steam explosion, characterized in that: The steps include: (1) Determine the filling amount of tobacco stem material according to the reactor capacity of the steam explosion equipment; (2) Determine the reactor pressure holding time t, min; (3) Determine the explosion factor R according to the requirements of the tobacco stems after steam explosion pretreatment; (4) Calculate the pressure P, MPa, according to the following formula: R = -0.395 + 1.135e p / 3.06 ; (5) The p value obtained is the pretreatment pressure of tobacco stem steam explosion.

2. The determination method according to claim 1, characterized in that: The moisture content of the tobacco stem material is 15wt% to 35wt%.

3. The determination method according to claim 1, characterized in that: The filling amount of tobacco stem material is more than 3 / 4 of the reactor capacity volume.

4. The determination method according to claim 1, characterized in that: The reactor pressure holding time t is 3min to 7min.

5. The determination method according to claim 1, characterized in that: The size of the explosion factor R is: 0.82≦R≦0.

94.

6. The determination method according to claim 1, characterized in that: The tobacco stem steam explosion pretreatment equipment is QBS-80.