技术领域technical field
本发明涉及烟叶烘烤技术领域，具体涉及一种三段六步式密集烤房燃煤节能烘烤方法。The invention relates to the technical field of tobacco leaf curing, in particular to a coal-fired and energy-saving curing method in a three-stage six-step intensive curing barn.
背景技术Background technique
随着世界范围内能源危机愈演愈烈，能源价格一再攀升，导致烤烟生产成本逐年增加，严重影响了我国烤烟生产的可持续发展。目前，我国烤烟年产量维持在250万t左右，按每烤1kg干烟需要1.5～2.0kg煤炭计，烘烤烟叶需要消耗煤炭375万～500万t。在此形势下，及时更新烘烤观念，创新烟叶烘烤节能工艺及管理机制，降低烟叶烘烤能耗，对提高其经济和社会效益具有重要意义。As the energy crisis intensifies around the world, the price of energy has risen again and again, resulting in an increase in the production cost of flue-cured tobacco year by year, seriously affecting the sustainable development of flue-cured tobacco production in my country. At present, the annual output of flue-cured tobacco in my country is maintained at about 2.5 million t. According to the calculation that 1.5-2.0 kg of coal is required for each kg of dry tobacco to be cured, 3.75 million-5 million t of coal is required for curing tobacco leaves. In this situation, it is of great significance to update the concept of curing in time, innovate the energy-saving technology and management mechanism of tobacco leaf curing, and reduce the energy consumption of tobacco leaf curing, which is of great significance to improve its economic and social benefits.
随着全国种烟规模的不断扩大、种烟大户的崛起，气流上升式普通烤房由于装烟容量少且温湿度分布不均匀，己成为烤烟生产规模化和现代化发展的障碍之一。密集烤房装烟密集大，烤房内温、湿度更均匀，烟叶品质好。密集烘烤也成为近年来国家烟草专卖局重点推广的烤烟生产技术。从2005年大力实施烟田基础设施建设至今，全国已累计推广密集烤房79万座。然而，由于密集烤房的推广步伐较快，生产过程中出现了一些问题，烟叶烘烤能源利用率低。With the continuous expansion of the scale of tobacco growing in the country and the rise of large tobacco growers, the upward airflow ordinary curing barn has become one of the obstacles to the large-scale and modern development of flue-cured tobacco production due to its small tobacco storage capacity and uneven temperature and humidity distribution. Intensive barns are densely filled with smoke, the temperature and humidity in the barn are more uniform, and the quality of tobacco leaves is good. Intensive curing has also become a flue-cured tobacco production technology promoted by the State Tobacco Monopoly Administration in recent years. From 2005 to vigorously implement the construction of tobacco field infrastructure, the country has promoted a total of 790,000 intensive curing barns. However, due to the rapid promotion of dense curing rooms, some problems have appeared in the production process, and the energy utilization rate of tobacco leaf curing is low.
烟叶烘烤是一个大量耗能的过程，目前我国最主要的烟叶烘烤燃料是煤炭，但由于热能利用率低，煤炭资源存在较大的浪费情况。现在我国能源日趋紧张，煤炭价格不断上涨，必须提高烟叶烘烤的燃料利用率。此外，烟叶烘烤过程煤炭燃烧会释放粉尘、硫化物等有害物质及固体废弃物，造成了较大的资源浪费和环境污染，煤炭未燃烧完全时，资源浪费和环境污染更为严重。降低烟叶烘烤中煤炭消耗，提高能源利用效率，已成为烟叶烘烤能源利用研究的重要课题。Tobacco curing is a process that consumes a lot of energy. At present, the main fuel for tobacco curing in my country is coal, but due to the low utilization rate of heat energy, there is a large waste of coal resources. Now my country's energy is becoming increasingly tense and coal prices are rising, so it is necessary to improve the fuel utilization rate of tobacco leaf baking. In addition, the combustion of coal during the tobacco leaf curing process will release harmful substances such as dust and sulfide and solid waste, resulting in a large waste of resources and environmental pollution. When the coal is not completely burned, the waste of resources and environmental pollution are more serious. Reducing coal consumption and improving energy utilization efficiency in tobacco leaf curing has become an important topic in the research of tobacco leaf curing energy utilization.
发明内容Contents of the invention
针对现有技术中的上述不足，本发明主要目的是提供一种三段六步式密集烤房燃煤节能烘烤方法，以降低烟叶烘烤过程煤炭消耗，提高能源利用效率；规范燃煤操作过程并减少污染排放。Aiming at the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to provide a coal-fired energy-saving baking method in a three-stage six-step dense curing room, so as to reduce the coal consumption in the tobacco leaf curing process and improve energy utilization efficiency; standardize coal-fired operation process and reduce pollution emissions.
为了实现上述目的，本发明采用的技术方案如下：In order to achieve the above object, the technical scheme adopted in the present invention is as follows:
三段六步式密集烤房燃煤节能烘烤方法，包括变黄阶段、定色阶段和干筋阶段，变黄阶段包括变黄前期、叶片变黄期和支脉变黄期，定色阶段包括主脉变黄期和香气物质合成期，干筋阶段包括干筋期，包括如下步骤：The coal-fired energy-saving baking method of the three-stage six-step intensive baking room includes the yellowing stage, the color fixing stage and the tendon drying stage. The yellowing stage includes the early yellowing stage, the leaf yellowing stage and the branch vein yellowing stage. The color fixing stage includes The yellowing period of the main vein and the synthesis period of aroma substances, the dry gluten stage includes the dry gluten period, including the following steps:
A、根据“斤烟斤煤”的烘烤目标及标准煤热值进行计算得到三段六步式烤烟过程各阶段所需热量；A. Calculate the heat required for each stage of the three-stage six-step flue-cured tobacco process according to the baking target of "jin smoke coal" and the calorific value of standard coal;
对烤烟地区主要燃煤热值进行分析，根据三段六步式烤烟过程各阶段所需热量，计算出烤烟地区主要燃煤耗煤量，并建立数据库；Analyze the main coal calorific value of the flue-cured tobacco area, and calculate the main coal consumption of the flue-cured tobacco area according to the heat required in each stage of the three-stage six-step flue-cured tobacco process, and establish a database;
B、对大块煤料进行破碎处理，在烘烤过程各阶段按计量加煤并进行燃煤的配置；变黄期采用热值较低的煤料，在火力要求较高的干筋期与定色期采用高热值煤料。B. Crushing the bulk coal materials, adding coal according to the metering at each stage of the baking process and carrying out coal-fired configuration; coal materials with lower calorific value are used in the yellowing period, and coal materials with lower calorific value are used in the drying period with higher firepower requirements. The color-fixing period adopts high calorific value coal.
相对于现有技术，本发明具有如下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
本发明在烘烤加煤过程中，根据三段六步式烤烟各阶段燃煤耗煤量进行燃煤配置，遵循“少、薄、匀、勤”的特点，根据温、湿度进行调控，各阶段每次少量加煤，维持较薄煤层，均匀铺煤，多次勤加的原则；在升温和瞬时火力较高时添加细碎煤炭，可较好的充分燃烧并提高燃烧强度；在稳温和后期阶段添加大块煤炭至炉膛中部，并配合添加少量细碎煤料至四周，可保证燃烧过程的稳定和持久性；在各阶段燃烧过程之后，在稳温阶段对燃烧过程中产生的煤渣进行重复燃烧，充分利用其热量，提高燃煤燃烧效率和利用率；降低了烟叶烘烤过程煤炭消耗，提高能源利用效率，规范了燃煤操作过程并减少污染排放。In the process of roasting and adding coal, the present invention configures the coal according to the coal consumption in each stage of the three-stage and six-step flue-cured tobacco, follows the characteristics of "less, thin, uniform, and frequent", and adjusts and controls according to the temperature and humidity. The principle of adding a small amount of coal at each stage, maintaining a thinner coal seam, spreading coal evenly, and adding more frequently; adding finely divided coal when the temperature rises and the instantaneous firepower is high, can fully burn and increase the combustion intensity; Add large pieces of coal to the middle of the furnace in stages, and add a small amount of finely divided coal to the surroundings to ensure the stability and persistence of the combustion process; after each stage of combustion, the coal slag generated during the combustion process is repeatedly burned in the temperature stabilization stage , make full use of its heat, improve coal combustion efficiency and utilization rate; reduce coal consumption in the tobacco leaf baking process, improve energy utilization efficiency, standardize coal combustion operation process and reduce pollution emissions.
附图说明Description of drawings
图1为三段六步式密集烤房燃煤节能烘烤方法示意图；Fig. 1 is a schematic diagram of a coal-fired energy-saving baking method in a three-stage six-step intensive baking room;
图2为变黄前期烟叶烘烤燃煤添加后燃烧状态图；Fig. 2 is a diagram of the combustion state after the tobacco leaves are roasted and fired with coal in the early stage of yellowing;
图3为叶片变黄期烟叶烘烤燃煤添加后燃烧状态图；Fig. 3 is a diagram of the combustion state after the tobacco leaves are baked and fired with coal in the yellowing period of the leaves;
图4为支脉变黄期烟叶烘烤燃煤添加后燃烧状态图；Fig. 4 is a diagram of the combustion state after the addition of coal for tobacco leaf baking during the yellowing period of the branches;
图5为主脉变黄期烟叶烘烤燃煤添加后燃烧状态图；Figure 5 is a diagram of the combustion state after the addition of coal for tobacco leaf baking during the main vein yellowing period;
图6为香气物质合成期烟叶烘烤燃煤添加后燃烧状态图；Fig. 6 is a diagram of the combustion state after the addition of tobacco leaves during the synthesis period of aroma substances by baking coal;
图7为干筋期烟叶烘烤燃煤添加后燃烧状态图。Fig. 7 is a diagram of the combustion state after the addition of coal for tobacco leaf drying in the dry tendon stage.
具体实施方式detailed description
下面结合附图和实例对本发明作进一步详细地说明。Below in conjunction with accompanying drawing and example the present invention is described in further detail.
参见图1：三段六步式密集烤房燃煤节能烘烤方法实例，在该实例中采用如图1所示的步骤和流程，包括如下步骤：See Figure 1: An example of a coal-fired energy-saving baking method in a three-stage six-step intensive baking room. In this example, the steps and process shown in Figure 1 are used, including the following steps:
A、首先，烤烟前选取成熟度较好的烟叶共计370竿，总干烟重量376kg，按斤烟斤煤的目标进行折算，烤烟的总耗煤量约376kg（该耗煤量为标准煤耗煤量），即烘烤1kg的干烟需要消耗1kg的标准煤。A. First of all, a total of 370 rods of tobacco leaves with good maturity are selected before flue-curing, and the total dry tobacco weight is 376kg. Converted according to the target of bituminous coal, the total coal consumption of flue-cured tobacco is about 376kg (the coal consumption is standard coal consumption amount), that is, to roast 1kg of dry tobacco needs to consume 1kg of standard coal.
其次，根据标准煤的发热量（标准煤的发热量为Q标准煤=7000kcal/kg），计算得到三段六步式烤烟所需总的热量。再根据三段六步式烤烟各阶段理论烘烤时间作为比例，计算出三段六步式烤烟过程各阶段所需热量。Secondly, according to the calorific value of standard coal (the calorific value of standard coal is Qstandard coal = 7000kcal/kg), the total heat required by the three-stage six-step flue-cured tobacco is calculated. Then according to the theoretical baking time of each stage of the three-stage six-step flue-cured tobacco as a ratio, the heat required for each stage of the three-stage six-step flue-cured tobacco process is calculated.
最后，对烤烟地区主要燃煤发热量进行分析并建立数据库，根据三段六步式烤烟过程各阶段所需热量，计算出烤烟地区主要燃煤耗煤量，并建立数据库。Finally, the calorific value of main coal in flue-cured tobacco area is analyzed and a database is established. According to the heat required in each stage of the three-stage and six-step flue-cured tobacco process, the main coal consumption of flue-cured tobacco area is calculated and the database is established.
如某烤烟地区主要烤烟燃煤有煤炭a和煤炭b，通过分析得到煤炭a煤炭b的发热量（热值）分别为Qa=6800kcal/kg、Qb=5500kcal/kg；按照三段六步式烟叶烘烤各阶段所需热量，通过计算得到三段六步式烤烟过程各阶段煤炭a和煤炭b的耗煤量，如表1所示。For example, in a flue-cured tobacco area, the main flue-cured coals are coal a and coal b. Through analysis, the calorific value (calorific value) of coal a and coal b is Qa=6800kcal/kg and Qb=5500kcal/kg respectively; according to the three-stage six-step tobacco leaf The amount of heat required for each stage of baking is obtained by calculating the coal consumption of coal a and coal b in each stage of the three-stage six-step flue-cured tobacco process, as shown in Table 1.
表1Table 1
B、对大块煤料进行破碎处理，在烘烤过程各阶段根据步骤A所建立的数据库，按计量加煤并适当进行燃煤的配置，保证规范化加煤操作。在变黄期采用热值较低的煤料b，在火力要求较高的干筋期与定色期采用高热值煤料a。不同烘烤阶段采用不同发热量的煤料可以有效提高煤的热能利用率，合理减少用煤量，减低烘烤成本。B. Carry out crushing treatment of large coal materials, add coal according to the measurement and properly configure coal combustion according to the database established in step A at each stage of the baking process, and ensure standardized coal addition operations. Coal material b with lower calorific value is used in the yellowing period, and coal material a with high calorific value is used in the dry tendon period and color fixation period with higher firepower requirements. The use of coal materials with different calorific values in different baking stages can effectively improve the thermal energy utilization rate of coal, reasonably reduce the amount of coal used, and reduce the cost of baking.
为保证煤炭充分高效的燃烧，应对大块煤料进行破碎处理，根据各阶段加煤的不同要求，利用三段六步式烘烤各阶段所需的不同热量，在烘烤过程中针对不同的煤种和燃烧情况进行灵活添加，在各阶段加煤过程中体现节能烘烤的目标。In order to ensure the full and efficient combustion of coal, large coal materials should be crushed. According to the different requirements of coal addition in each stage, the different heat required for each stage of three-stage six-step baking is used to target different coal during the baking process. Coal types and combustion conditions are added flexibly, and the goal of energy-saving baking is reflected in the coal addition process at each stage.
在三段六步式烘烤各步中均有升温和稳温过程，在各阶段升温和瞬时火力要求较高时添加细碎煤炭；在各阶段稳温和后期阶段（包括第5步香气物质合成期和第6步干筋期）添加大块煤炭至炉膛中部，并配合添加少量细碎煤料至四周。各阶段升温过程之后，在稳温阶段对燃烧过程中产生的煤渣进行重复燃烧。There are heating and stabilizing processes in each step of the three-stage six-step roasting, and finely crushed coal is added when the heating up and instantaneous firepower requirements of each stage are high; and step 6 during the dry tendon period) add large pieces of coal to the middle of the furnace, and add a small amount of finely divided coal to the surroundings. After the heating process of each stage, the coal slag produced in the combustion process is repeatedly burned in the temperature stabilization stage.
此外应规范加煤操作方式，烘烤加煤过程遵循“少、薄、匀、勤”的特点，根据温湿度进行调控，各阶段加煤应确保每次少量，煤层较薄，均匀铺煤，多次勤加的原则。各阶段节能烘烤精细化加煤操作如下：In addition, the coal feeding operation method should be standardized. The baking and coal addition process follows the characteristics of "less, thin, uniform, and frequent", and is regulated according to temperature and humidity. Each stage of coal addition should ensure a small amount of coal each time, and the coal seam is thin and evenly spread. The principle of repeated diligence. Energy-saving roasting and refined coal addition operations at each stage are as follows:
1）变黄前期1) Early yellowing
加煤操作：点火过程前清理炉膛，加入10kg煤渣铺满炉膛底部的中间部分，炉膛初始加煤5～10kg，初始加煤占炉膛面积的1/4，煤层厚度为5～7公分；以后每次加煤3～5kg，加煤面积占炉膛面积的1/4，厚度为5～7公分，直至加煤量达到变黄前期耗煤量为止；根据温湿度进行调控，灵活少量加煤，维持较薄煤层，均匀铺煤，以保持小火、稳温为原则。Coal filling operation: clean the furnace before the ignition process, add 10kg of coal slag to cover the middle part of the bottom of the furnace, initially add 5-10kg of coal to the furnace, account for 1/4 of the furnace area, and the thickness of the coal seam is 5-7 cm; Add coal 3~5kg at a time, the coal addition area accounts for 1/4 of the furnace area, and the thickness is 5~7 cm, until the amount of coal addition reaches the coal consumption in the early stage of yellowing; adjust and control according to the temperature and humidity, add a small amount of coal flexibly, and maintain For thinner coal seams, spread coal evenly, and keep a small fire and stable temperature as the principle.
阶段目标：点火过程之后以每小时升温1℃速度升至35～36℃，保持干湿温差1～2℃，促使烟叶发热，以稳温为主，升温为辅。变黄前期烟叶烘烤燃煤添加后燃烧状态如图2所示。Phase goal: After the ignition process, the temperature is raised to 35-36°C at a rate of 1°C per hour, and the temperature difference between dry and wet is maintained at 1-2°C to promote the heating of the tobacco leaves. The combustion state of tobacco leaves in the early stage of yellowing is shown in Fig. 2 after adding coal.
2）叶片变黄期2) Leaves turning yellow
加煤操作：每次加煤量为5～7kg，铺煤面积占炉膛面积1/4～1/3，煤层厚度为5～7公分，直至加煤量达到叶片变黄期耗煤量为止；灵活少量加煤，维持较薄煤层，均匀铺煤，维持小火和稳定的燃烧。Coal feeding operation: the amount of coal added each time is 5-7kg, the area of coal laying accounts for 1/4-1/3 of the furnace area, and the thickness of the coal seam is 5-7 cm, until the amount of coal added reaches the coal consumption during the yellowing period of the leaves; Add a small amount of coal flexibly, maintain a thin coal seam, spread coal evenly, and maintain a small fire and stable combustion.
阶段目标：使烘烤温度升至、并保持在37～39℃，湿球温度保持35～36℃，稳温至烟叶变黄发软、塌架。叶片变黄期烟叶烘烤燃煤添加后燃烧状态如图3所示。Stage goal: raise and maintain the curing temperature at 37-39°C, keep the wet bulb temperature at 35-36°C, and stabilize the temperature until the tobacco leaves turn yellow, become soft and collapse. Figure 3 shows the combustion state of the tobacco leaves in the yellowing period after the addition of coal.
3）支脉变黄期3) Branch veins turn yellow
加煤操作：每次加煤量为7～10kg，铺煤面积占炉膛面积1/2，煤层厚度为5～7公分，直至加煤量达到支脉变黄期为止；灵活适当的加煤，维持较薄煤层，均匀铺煤，同时维持中火和稳定的燃烧。Coal adding operation: the amount of coal added is 7-10kg each time, the coal laying area accounts for 1/2 of the furnace area, and the thickness of the coal seam is 5-7 cm, until the amount of coal added reaches the yellowing period of the branches; flexible and appropriate coal addition, maintain Thin coal seam, evenly spread coal, while maintaining medium fire and stable combustion.
阶段目标：以2～3小时升温1℃的速度升至42℃，湿球温度控制在36～37℃以内，稳温排湿，使烟叶达到勾尖、卷边、支脉全黄。支脉变黄期烟叶烘烤燃煤添加后燃烧状态如图4所示。Stage goal: to raise the temperature to 42°C at a rate of 1°C in 2 to 3 hours, control the wet bulb temperature within 36 to 37°C, stabilize the temperature and dehumidify, and make the tobacco leaves reach the point, edge and branches of the whole yellow. Fig. 4 shows the combustion state of the tobacco leaves in the yellowing stage of the branches after the addition of coal.
4）主脉变黄期4) The yellowing period of the main vein
加煤操作：根据主脉变黄期耗煤量加大添煤量，每次加煤量为10kg，将煤加满炉膛，做到勤加煤料并均匀铺煤，稳定加大烧火。Coal feeding operation: increase the amount of coal added according to the coal consumption during the yellowing period of the main vein. The amount of coal added is 10kg each time.
阶段目标：当烟叶达到勾尖、卷边、支脉变白后，以每2～3小时升温1℃的速度将烤房温度升至45～48℃，湿球温度控制在37～38℃，加大通风排湿，稳定干球温度，调整湿球温度，稳温促进烟筋变白，烟叶变化达黄片、黄筋、小卷筒。主脉变黄期烟叶烘烤燃煤添加后燃烧状态如图5所示。Stage goal: When the tobacco leaves reach the hook point, curling edge, and branch veins turn white, raise the temperature of the barn to 45-48°C at a rate of 1°C every 2-3 hours, and control the wet bulb temperature at 37-38°C. Great ventilation and dehumidification, stabilize the dry bulb temperature, adjust the wet bulb temperature, stabilize the temperature and promote the whitening of the tobacco tendon, and the change of the tobacco leaves reaches yellow slices, yellow tendons, and small rolls. Figure 5 shows the combustion state of tobacco leaves in the yellowing period of the main vein after the addition of coal.
5）香气物质合成期5) Synthesis period of aroma substances
加煤操作：根据香气物质合成期耗煤量加大添煤量，每次加煤量为10kg，将煤加满炉膛，做到勤加煤料并均匀铺煤，维持烧大火。Coal feeding operation: Increase the amount of coal added according to the amount of coal consumed during the synthesis of aroma substances. The amount of coal added each time is 10kg.
阶段目标：稳定干球温度在52～54℃，保持湿球温度在38～40℃，延长稳温时间，确保主脉发软变黑，叶片全干，使烟叶香气物质合成，缩小叶片正反面色差。香气物质合成期烟叶烘烤燃煤添加后燃烧状态如图6所示。Phase goals: stabilize the dry bulb temperature at 52-54°C, keep the wet bulb temperature at 38-40°C, extend the temperature stabilization time, ensure that the main vein becomes soft and black, and the leaves are completely dry, so that the aroma substances of the tobacco leaves are synthesized, and the front and back sides of the leaves are reduced chromatic aberration. Figure 6 shows the combustion state of tobacco leaves during the synthesis stage of aroma substances after adding coal.
6）干筋期6) Dry gluten period
加煤操作：根据干筋期耗煤量进行加煤，每次加煤5～7kg，每次加煤占炉膛面积2/3，逐步减少加煤面积，同时维持较薄煤层，做到勤加煤料并均匀铺煤，维持稳定烧中火。Coal addition operation: Add coal according to the coal consumption during the dry tendon period, each addition coal is 5-7kg, each addition takes up 2/3 of the furnace area, gradually reduce the coal addition area, and at the same time maintain a thinner coal seam to achieve frequent addition The coal material is evenly spread, and the fire is kept stable.
阶段目标：控制干球温度，限定湿球温度，适当减小通风，在湿球温度在41～42℃时候停止烧火。最高不能超过68℃，湿球温度最高不超过43℃，保持湿球温度在41～42℃，逐渐减小进风门通风量，促使全棚烟叶主脉全干。干筋期烟叶烘烤燃煤添加后燃烧状态如图7所示。Stage goal: control the dry bulb temperature, limit the wet bulb temperature, properly reduce ventilation, and stop burning when the wet bulb temperature is 41-42°C. The maximum temperature should not exceed 68°C, and the maximum wet bulb temperature should not exceed 43°C. Keep the wet bulb temperature at 41-42°C, gradually reduce the ventilation volume of the air inlet door, and make the main veins of the tobacco leaves in the whole shed dry. Figure 7 shows the combustion state of the tobacco leaves in the dry tendon stage after the addition of coal.
最后说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的宗旨和范围，其均应涵盖在本发明的权利要求范围当中。Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.
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| CN201410676212.1ACN104397867B (en) | 2014-11-24 | 2014-11-24 | Three section of six step formula dense tobacco flue-curing house coal-fired energy-saving baking method |
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| CN200962837Y (en)* | 2006-07-28 | 2007-10-24 | 曲靖中建工程技术有限公司 | Automatic complete flow controlling device for baking tobacco leaves |
| CN102499425A (en)* | 2011-10-26 | 2012-06-20 | 中国烟草总公司重庆市公司酉阳分公司 | Method for flue-curing tobacco by using tobacco straws |
| CN102697159A (en)* | 2012-05-14 | 2012-10-03 | 中国烟草总公司重庆市公司烟草科学研究所 | Three-section six-step tobacco baking method |
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