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Shandong Fengxin Technology Development Co., Ltd

Mobile: + 86-15965759999

Tel.: + 86-0635-2531988

Email: fengxin@cnfengxin.cn

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Address: Hi tech Industrial Park, Linqing City, Shandong Province (shilitun, Xinhua office)


Economic value of paper machine equipped with closed hood

2020-04-20 16:47:10
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High temperature and high-speed hot air hood is widely used in modern high-speed paper machine, which is one of the most valuable equipment in the drying ventilation equipment. The paper industry of closed hood is a high input and high energy consumption industry. The comprehensive energy consumption per ton of paper is about 1.55-1.70t standard coal, 100 tons of water, and the steam energy consumption accounts for more than 15% of the paper cost, while the drying  section is the most energy consumption stage in the paper industry. Therefore, how to improve the drying rate, reduce energy consumption, save costs and improve economic efficiency is the key to the production of the whole enterprise.

Jinan airtight hood

The closed hood forms a relatively closed space outside the drying cylinder. The temperature and humidity of the space are relatively stable, which reduces the loss of heat emission on the surface of the drying cylinder, saves the steam consumption, and at the same time, the exhaust temperature and humidity are high, which can be recycled again.

At present, most of the paper-making enterprises adopt two-stage waste heat recovery:

1) primary heat recovery device: gas air heat exchanger; after preheating the fresh air with exhaust air, the temperature of the fresh air is increased to 55-65 ℃, and the temperature of the exhaust air is reduced to 60-65 ℃;

2) secondary heat recovery device: gas liquid heat exchanger; use exhaust to heat cold water, clean fabric or other process water, and reduce the exhaust temperature to 40-45 ℃.


Airtight hood manufacturer

As for the hot air exchange system, the ventilation system and the waste heat recovery device play a decisive role in the drying efficiency of the closed hood, and the operation of the hood reflects the operation of the whole hot air exchange system of the drying section.


Take a paper machine with annual capacity of 100000 tons as an example:

Air inlet temperature: 95-110 ℃;

Exhaust temperature: 78-85 ℃;

Dew point temperature: 58-62 ℃;

Exhaust air volume: 1.5x105kg/h;

Enthalpy value: 7.6x107kj/h (equivalent to the heat discharged by the condensation of 33 tons of steam. The enthalpy value is very objective. If it can be recovered, it will greatly save energy).


Shandong airtight hood

The heat enthalpy of the air exhaust of the cylinder hood of the closed hood manufacturer is mainly stored in the water vapor. In summer, the secondary heat recovery method is adopted: temperature: 35 ℃; air moisture content: 14g / kg; exhaust temperature: 80 ℃; exhaust relative humidity: 40%; primary exhaust temperature: 60 ℃; secondary exhaust temperature: 45 ℃; the data shows that the primary heat recovery is sensible heat recovery, with a recovery capacity of 25.5kj/kg, accounting for 7.6% of the recoverable amount; secondary recovery is latent heat recovery, with a recovery capacity of 25.5kj/kg. The total recovery capacity is 227.325.5kj/kg, accounting for 89% of the total recovery capacity. The secondary heat recovery energy accounts for 67.4% of the recoverable amount and the remaining energy is 25%.

The above data show that the high-speed paper machine equipped with closed hood can not only reduce energy consumption, but also improve the paper quality, improve the workshop production environment, improve the paper machine operation efficiency, and the cost can be recovered within half a year.


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密闭气罩Tel.: + 86-0635-2531988
丰信科技Email: fengxin@cnfengxin.cn
密闭气罩Address: Hi tech Industrial Park, Linqing City, Shandong Province (shilitun, Xinhua office)

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