Research significance baking is a key factor in determining the quality and usability of tobacco leaves (Tie Yan et al., 2009), and the baking room is the carrier of the baking process and is the key equipment for tobacco leaf baking. Intensive barn is one of the main types of barns for the promotion and application of tobacco leaf bake. Because of its large amount of smoke, low baking cost, good appearance quality and inherent quality of roasted tobacco leaves, it is now available in various tobacco areas across the country. It was quickly promoted (Zhan Jun et al., 2011). By the end of 2009, a total of 415,500 intensive barns were promoted in China's tobacco-growing areas, and more than 60% of the roasting tobacco roasting work in China was undertaken. However, due to the construction of dense barn walls, red bricks or hollow bricks with strong thermal conductivity are used, and the heat loss during baking is large, and the higher the baking temperature, the greater the heat loss (Ai Longlong et al., 2009; Wang Wenchao et al., 2011) ). Even a brand new, well-sealed barn has a heat utilization rate of only about 60%, and the remaining 40% is lost through wall conduction, radiation or air leakage (Song Chaopeng et al., 2009a) . Therefore, how to reduce the energy loss in the baking process of the dense barn, improve the heat energy utilization rate, reduce the baking cost, and become the current intensive fund project: the National Tobacco Monopoly Bureau scientific and technological research project (1102004010030) Hot spots and focus of attention. Previous research progress Zong Shulin et al. (2010) showed that the use of waste heat to share roasting tobacco in the roasting house can increase the utilization rate of thermal energy by 20%, reduce the cost of drying dry tobacco by 0.57 yuan/g, increase the proportion of upper and middle tobacco leaves by 2.2%, and the average price of dry tobacco. Increased 0.66 yuan/kg. Wang Guoping and Xiang Penghua (2010) designed and produced a waste heat utilization device to connect two dense barns to send the hot air discharged from the previous barn to the next barn; The device can improve the baking quality of tobacco leaves, reduce the baking cost of tobacco leaves, and has remarkable effects on energy saving and emission reduction. Wang Jianan et al. (2011) studied the effects of the nano-material smear-in-dense chamber and the heated indoor wall on the baking performance and the quality of the tobacco in the baking room. The results showed that the nano-coating was applied to the smoking chamber and the heated interior wall of the dense barn. After that, the vertical and horizontal temperature differences in the baking room were reduced by 1.5 and 1.7 C, the baking time was shortened by 15 h, the baking energy consumption was reduced by 0.32 yuan/kg, and the appearance quality of the upper tobacco leaves was significantly improved. Ma Ying et al. (2011) converted two ordinary intensive barns into solar-powered barns in Xingai City, southwest Guizhou, and the results showed that the quality of the intensive tobacco in the solar-intensive barn was compared with that of the ordinary dense barn. The quality is consistent. In this study, China has carried out more research on the insulative insulation performance of insulation materials in dense barns (Yu Jinlong et al., 2009; Song Chaopeng et al., 2009b; Wu Shengjiang et al., 2009; Wang Jianan et al., 2011), but mainly concentrated In the application of nanomaterials, the application of foam insulation materials in dense barns has not been reported. The key problem to be solved is to use the flue-cured tobacco variety Yunyan 85 as the material, and simultaneously bake in the dense baking room with foam insulation material and no foam insulation material. Compare the two kinds of dense barns during baking time, energy consumption and baking. The differences in the quality of tobacco leaves and other indicators are intended to provide a theoretical basis for further reducing the cost of baking and improving the baking performance of dense barns, and also provide strong support for the practice of flue-cured tobacco production.

1Materials and methods 1.1 The test materials were tested at the tobacco leaf baking workshop base in Dechang County, Sichuan Province. The tested flue-cured tobacco varieties were Yunyan 85. The baking room A was an airflow-down intelligent control intensive barn. As a control, its smoking room The specification is 8.0mx 2.7mx3.6m, three sheds are loaded with smoke, the smoke capacity is about 400ç«¿/room, the fresh tobacco leaves weighs 30004000kg (depending on the location), the wall of the smoking room is brick-concrete structure; the baking room B is in On the basis of the baking room A, a 3cm thick foam insulation layer is added to the wall and ceiling of the interior of the smoker, and a 5cm thick foam insulation layer is added to the floor, and the smoke chamber and the heating chamber partition wall and other hot air inlets are 50cm. No foam insulation is added in the range.

1.2 Test method 1.2.1 No-load test Close the smoke door of the baking room A and the baking room B, and ignite at the same time, add the same weight of coal every time. The circulating fan high-speed file is always turned on during the test, and the two kinds of intensive roasting are compared. The heating effect when the room is not filled with smoke.

1.2.2 Smoke test The baking room A and the baking room B are loaded with the same parts (lower leaves, middle leaves and upper leaves), the same maturity, the same number of turns, and the basic consistency of the tobacco leaves. The two dense barns were ignited at the same time and baked according to the three-stage baking process (Miyag Chang, 2006). Compare the two stages of intensive baking rooms in stages, coal consumption, power consumption, proportion of upper-class smoke in roasted tobacco leaves, and average price.

2 Results and analysis 2.1 Comparative analysis of no-load heating effect It can be seen that the temperature rises from 25C to 33C, and the temperature rise rate of the two treatments is the same, both are 1.25C/h; but from 33C to 68C, the baking room B The heating rate was obviously accelerated, the average heating rate was 2.92C/h, and the average heating rate of the baking room A was 2.19C/h, which was 0.73C/h lower than that of the baking room B. It can be seen that the dense baking room with foam insulation material is installed. B insulation performance is significantly better than the baking room A. Figure 丨 different barn room no-load heating effect comparison. Hebei Agricultural Sciences, 13 (3): Gong Changrong. 2006. Introduction to three-stage baking of flue-cured tobacco. Beijing: Science Press.

Hao Jing. 2006. High quality and high yield cultivation and baking technology of tobacco. Beijing: China Agricultural Press: 80. Ma Ying, Peng Yu, Wang Gang, He Bing, Li Jiajun, Chen Fenglei, Wang Feng, Yang Shuangjian, Zhou Changhua, Shao Zhongshun, Cao Peng, Wu Liangxue. 2011. Research on energy-saving effect of baking in solar energy dense barn in southwestern Guizhou. Modern agricultural science and technology, (3): 263-264, 266. Song Chaopeng, Peng Wanshi, Yang Chao, Ma Xiao, Zhang Weijian, Gong Changrong. 2009a. Application of nano-coating in dense baking of flue-cured tobacco. Journal of Northwest A&F University: Natural Science Edition, 37(8): 97-100. Song Chaopeng, Zhang Qinsong, Yang Chao, Li Changjun, Gong Changrong. 2009b. Application prospects of nano-coatings in tobacco leaf baking. Crop Magazine, (1) Tie Yan, and Zhijun, Luo Huilong. 2009. Current status and prospects of tobacco leaf baking intensive applications. Chinese Agricultural Science Bulletin, 25(13) 260-262. Wang Guoping, Xiang Penghua. 2010. Intensive bakehouse group waste heat utilization on tobacco leaf baking costs Wang Jianan, Wu Shengjiang, Guo Yan, Song Chaopeng, Wang Shenglei, He Fan, Gong Changrong. 2011. The effect of nano-coating on the baking performance and quality of tobacco in dense barn. Journal of Yunnan Agricultural University, 26 (3) Wang Wenchao, He Fan, Xu Chenglong, Duan Shijiang, Shi Panpan, Wang Tao, Wang Mei, Gong Changrong. 2011. Research progress on tobacco leaf baking energy-saving technology. Southern Agricultural Journal, 42 Wu Shengjiang, Song Chaopeng, Huo Kailing, Cheng Long, Wang Zhanyi, Gong Changrong. 2009. Nano-coating oven baking on cell wall enzymes and components and economic traits and effects. Zhong Yu Jin Long, Tan Fangli, Deng Shixiong. 2009. Application effect of baking room nano-functional paint in tobacco leaf baking. Chinese Tobacco Science, 30(5): 29-33, 40. Research progress and prospects. Southern Agricultural Journal, 42 (11) Zong Shulin, Hou Yueliang, Du Chuanyin, Guo Quanwei, Li Jianlei, Liu Zhongqing, Liu Jian, Wen Liang, Tan Qingtao. 2010. Development of waste heat sharing intensive barn. China Tobacco Branch (Responsible Editor Lan Zongbao)

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