Comprehensive technical transformation based on TMCI reconstituted tobacco production line
With the rapid development of the tobacco industry, the application prospects of reconstituted tobacco leaves are becoming more and more broad. The blending of reconstituted tobacco leaves in cigarettes can effectively reduce the consumption of tobacco leaves and the release of tar from cigarettes, thereby reducing production costs and improving the safety of cigarettes. the goal of. With the increase in the production and sales volume of enterprise cigarettes, remanufactured tobacco production has become a bottleneck restricting development. It is urgent to improve the production capacity and product quality of the TMCI 300kg/h thick pulp process reconstituted tobacco production line through equipment technological transformation. 1 Equipment defect analysis Due to the low dewatering and drying ability of the thick slurry in the baking equipment of the TMCI production line, the moisture content of the reconstituted tobacco leaves is exceeded, the transverse tensile strength is low, and the production capacity is low. If there is enough drying capacity, the production capacity of reconstituted tobacco can be improved by increasing the operating speed of the steel strip, the thickness of the finished product, and the solid content of the thick slurry. The drying of reconstituted tobacco leaves does not have to be done once, or it can be dried twice after slitting to achieve the final moisture content requirement. However, the moisture content of the reconstituted tobacco leaves, the hot air temperature and the relative humidity of the hot air are changed. The relationship is visible. The first 1/3 of the oven is heated and heated. The relative humidity in this area is the largest and the hot air temperature is the lowest, which is not conducive to heating and dehumidification of the thick slurry. The 1/3 area in the middle of the baking box is the main dewatering forming area, and the relative humidity of the hot air in the area increases rapidly> the temperature decreases rapidly, and the efficiency of dewatering and forming the thick slurry is not high. Stereotype, the hot air temperature in this area is high, the relative humidity is very low, the moisture content of reconstituted tobacco leaves decreases rapidly, and the stable time is shorter. Shi Hehua (1974- Shangnan, Hunan Changsha, graduated from college, engineer, mainly engaged in cigarettes) Work on equipment management and process improvement. +. Comparison of water content change curves of reconstituted tobacco leaves in the baking box before and after the transformation. It can be seen that the work of the two independent hot air systems after the transformation does not interfere with the temperature of the first half of the baking box. For 150* hot air, the thick slurry is heated and heated quickly, and the moisture is quickly taken out of the baking box, which is beneficial to the rapid dehydration and dehumidification of the thick slurry, speeding up the drying speed and molding; the hot air of 110C is used in the second half of the baking box. Drying and reconstituting tobacco leaves, the moisture content stability of the finished product is improved, the curve is smoother, and the transverse moisture content and other indicators are often used to detect the moisture content of the finished product, which often has a large deviation. The tensile index is low, the reconstituted tobacco is easy to be broken during the stripping and slitting process, and the adjustment control is more difficult. Generally speaking, the heating of the steel strip is basically evenly distributed throughout the baking oven, mainly the hot air heating system. Unreasonable design, need to be improved 2 Comprehensive technical improvement 21 Improved ability to dry and dehumidify the forming zone As shown, the 30m baking is divided into 2 hot air drying zones, and a set is installed in the middle of the baking machine. The radiator and the original exhaust fan form the first hot air system; a new hot air system and the original hot air system are added to the original hot air system to form a second hot air system, thus realizing 2 hot air The independent adjustment of the temperature in the drying zone improves the overall drying capacity of the equipment, solves the problem of high humidity at the wet end and low drying capacity. The structure of the equipment in the post-baking zone is improved. The air volume of the heat exchange fan before the transformation is the air volume of the 16 tidal fan. It is designed and calculated by the 19700. The heating system added in the middle of the baking area also includes: a muffler and a fan with an air volume of 15 000 m3/h (the actual fan volume is 17527 m3 / h; Full pressure 1 454Pa) Heat exchange capacity 45000<4.184kJ radiator (actual heat dissipation area 87.04m2; wind surface area 1. 358m2; ventilation net area 0.72m2) temperature control system (I/P converter hot air temperature detection sensor) Vapor film valve, smart meter, etc. and the original exhaust fan form a complete first baking zone, which can control the hot air temperature to reach 150 ° C. Design to add a 20,000 m3 / h airflow fan in the middle of the baking zone (The actual fan air volume is 20 442m3/h; full pressure 2072Pa) and a drainage pipe, which forms a complete system with the original hot air fan, namely the second baking zone. The hot air of the first baking zone will be debugged. The inlet air temperature is set to 150 ° C, the thick slurry is rapidly heated and dehydrated, and the hot air inlet temperature of the second baking zone is set to 110 ° C. The substantially formed reconstituted tobacco leaves are dried to ensure the transverse tensile strength index. The calculation data of the standard indicates that the output can be increased by 50% and the equipment has sufficient drying capacity. 22 Improve the feed capacity of the thick slurry Kumakawa, increase the height of the thick slurry casting from e40rJm to 450 with ish, replace the thick slurry transfer pump with a new pump with a larger head and flow, and spread more thick slurry. Forming and drying on the steel strip, and adjusting the solid content of the thick slurry from 22 to 24%. 23 Improving the ability of the cigarette to be transported The fumes prepared in the dry zone and the viscose prepared in the pulp zone are mixed to form a thick slurry. As shown in the wind power transmission equipment before the transformation, the rated conveying capacity of the cigarette is only 300kg/h. Because the diameter of the wind conveying pipe is too small, there are too many elbows at 90°, and there is no wind regulating device, which is not convenient for control. Therefore, the resistance caused by the transportation of the cigarette is large, and the equipment of the feeding system is often blocked. The schematic diagram of the wind power transmission equipment before the transformation is carried out. After the technical transformation, the wind power transmission is changed to 2 auger conveyors, and the original wind power supply Roots pump is used. The filter, filter bag and wind conveying pipe are all removed. 3 Results and discussion The change curve of water content of reconstituted tobacco leaves in the improved baking oven after a1 is the change curve of moisture content of reconstituted tobacco leaves before and after baking oven modification. Table 1 Comparison of process indicators before and after improvement Project time Steel strip velocity Thick slurry solid content discharge Moisture rate thick slurry casting thickness I1m finished product thickness yield transverse tensile strength longitudinal tensile strength water resistance scented scent before transformation without odor after transformation, no odor into the equipment purchase cost and installation commissioning costs only a total of 375,000 yuan, economic benefits Very impressive Floor parcel boxes have a huge content in classic design. They can be securely bolted on floors outside your doors, providing a safe and secure way to receive parcels. 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