Heating type of the hottest corrugating roller and

2022-08-26
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Corrugated roller heating type and condensate recovery

corrugated roller is a group of heating elements, which are electric heating, gas heating, oil heating and ordinary steam heating corrugated roller. Steam heating is easy to control because of its fast heat transfer speed and stable temperature during heat exchange (saturated steam has the characteristics of fixed and unique temperature and total heat content under specific pressure), It can stably provide the same heat per unit time and per unit area, so it is the best heating method for continuous corrugated board production line

the condensate recovery system in the ordinary steam heated corrugated roller adopts siphon type. During the operation of the corrugating roll, the base paper is continuously heat exchanged with it, and the steam releases the latent energy. Then the sample is tightened and heated, and then reduced to condensed water. A layer of water film is formed on the inner wall of the roll and gradually thickened, and the condensed water is continuously discharged through the siphon by the pressure of the steam. This structure is simple and convenient, but the liquid water film formed on the inner wall of the roll body is bound to hinder the heat transfer efficiency of steam. When the corrugated roll stops running, condensed water will accumulate at the bottom, and the corrugated roll will deform and bend due to the temperature difference between the upper and lower parts, so that a lot of waste products will appear in the early stage of re operation and cause uneven wear of the corrugated roll

each has its own characteristics. Therefore, these parts are also the key parts of the vehicle VOC Control. The rapid heating and condensate anti accumulation and rapid discharge structure is the main feature of high-quality corrugated roll products widely used in the world at present. The heat energy groove type condensate recovery system divides the grooves equally on the inner wall circumference of the corrugating roll, so that the condensed water flows to the deeper annular groove at one end and is discharged by the siphon. Because the groove makes it difficult for the inner wall to form a water film, and it will not accumulate water at the bottom during shutdown, and increases the melting exchange area at the moment of heat exchange, it improves the heat transfer efficiency and avoids the deformation of the corrugated roll during shutdown

the drying dynamic system has three circular arc valves in the circular arc groove at one end of the corrugated roll body. During operation, the centrifugal action makes the valve plate stick to the outer wall of the circular arc groove, the drainage hole is opened, and the condensate is introduced into the drainage hole in the circular arc groove through the conical surface and discharged. During shutdown, gravity makes the upper valve plate close the drainage hole, and the lower valve plate opens the drainage hole, so that there is no ponding at the bottom. All of them should be checked regularly; The use performance of the peripheral heating system is better. No matter whether the corrugated roll is in the running or stopped state, due to the effect of steam pressure, the high-speed steam flow continuously discharges the condensed water, and the corrugated roll will not be deformed due to the uneven temperature caused by the condensed water, avoiding the abnormal wear of the waste cardboard, corrugated roll and pressure roll caused by the deformation of the corrugated roll when it is stopped and then restarted, Especially in the high-speed production line (the representative is German BHS). The equally divided heating holes on the roll wall increase the area of heat exchange a lot, and the heat transfer efficiency is very good. There is no problem in the manufacturing technology of various forms of corrugated rollers in China. For example, the peripheral heating system, many heating rollers in the plastic industry are of this structure, but the promotion of this form of corrugated roller also needs to have its supporting rotary joints

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