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Vacuum roller energy-saving technology: Most of the vacuum roller energy consumption and vacuum consumption, the vacuum roller used in forming the amount of vacuum required for all the vacuum amount of about 1/2, vacuum energy consumption will be with the machine speed and vacuum Degrees increase. Mainly due to the vacuum roll rotation, the shell of the gap needs to be continuous evacuation of the reason, need to evacuate about 2/3 of the air. Vacuum roller shell on the linear drilling to minimize the re-wet, no tapered hole, through the couch after the dryness of paper increased by 1% to 2%; in the same vacuum, the linear hole shell air The volume is reduced and vacuum flow is reduced by approximately 10%. Tapered holes The large surface area of the vacuum opening increases the energy consumption of the vacuum roll. Typically, about 60% of the open area is tapered, primarily to improve the drainage capacity of the dewatering process.
Energy consumption and energy saving technology in the press section: For every 1% increase in the dryness of the press section, the paper machine speed can be increased by about 50m / min. The shoe press usually increases the dryness by about 6%, ie, the shoe press increases the maximum speed by about 300 m / min. However, before replacing the shoe press and speeding up the paper machine, it is necessary to update the transmission equipment, improve the dewatering capacity of the forming section, and improve the running performance of the drying section. One of the main advantages of miniature shoe presses is that the existing press structure is less variable, reducing the amount of work and downtime, without the need to update the crane. In the press with a full-width jet device on the paper machine, the transverse moisture difference can generally be reduced by 80% or more, after the press drying paper increased by 2.5% to 3.0%. The dryness of the paper is higher after pressing, which reduces the steam consumption of the drying section; and the running performance is improved and the energy is saved by reducing the number of paper breaks.
Energy-saving drying technology: Developed by the US National Laboratory of multi-channel dryer, compared to the traditional dryer capacity can be increased by 50%, compared with equipped with a turbo-bar dryer capacity can be increased by about 20%. Conventional dryer with condensed water, as heat transfer obstacles. The new multichannel dryer has a relatively small passageway near the inner surface of the dryer, which improves heat transfer efficiency by significantly reducing the thickness of the condensate layer and increasing the surface temperature of the dryer. The technical transformation, the cost is only 20% of the new dryer. Stainless steel Yankee dryer with the same size steam drum of the same quality of traditional iron Yanke compared to the heat transfer coefficient and evaporation capacity increased by 25% to 30%. The drying capacity can be increased by 10% ~ 15% in the whole drying process. The efficiency of the dryer is greatly improved because the stainless steel material reduces the total quality of the dryer and reduces the thermal inertia and heat transfer resistance. In addition, the required drive energy is lower and easier to install. At the same time, because the stainless steel material can absorb a series of problems caused by cast iron dryer heat and pressure shock, and thus more secure.
Energy-saving effect of frequency conversion technology: Intermittent pulper through the motor frequency transformation, the use of basically the same process, running time, comprehensive energy-saving rate of about 25%. The pump frequency control is an effective energy-saving technology, energy-saving efficiency is high, almost because of design redundancy and the amount of waste and energy savings all the savings. In the conventional valve control, such as the motor speed constant, the excess energy to flow control valve baffle energy loss; and frequency control, which according to process requirements to automatically adjust the pump speed, the basic no extra loss of energy . Water ring vacuum pump is a positive displacement pump, which is characterized by pumping volume and speed is proportional to the working point of shaft power and its speed is proportional to the power of 1.7. That is, when the water ring vacuum pump is determined, can adjust the speed to adjust the pumping capacity. If the inverter can be used in 0.5 ~ 100Hz can be adjusted within the characteristics of continuous speed, you can 2 times the motor rated speed range to adjust the pumping capacity. Compressor air compressor energy loss is the main mechanical losses, the loss of compressed air waste, air compressor operating loss of air load, compressed air flow losses and other losses. When the air compressor output pressure is greater than a certain value, some paper companies or automatically open the unloading valve, the asynchronous motor idling, a serious waste of energy, or downtime. Motor start frequently, stop, affect the life of the motor, and air compressor frequency starting current, the impact on the power grid, motor bearing wear, maintenance of large equipment. Frequency conversion technology can solve the above problems.