The closed air cover, which generally refers to the airtight air cover of the paper machine, is used for a closed cottage aluminum alloy cover of the drying cadre and sizing department of the paper machine, and its function is to recycle the steam produced by the paper machine for better drying and energy saving.
The closed air cover includes a skeleton, an air cover sealing body, a movable roof (air duct), a lifting door, a roll changer, a lighting system, a walking platform and a railing, etc. The structure of each part is as follows:
The closed air cover of the drying part is of high value in the ventilation system of the paper machine, and it is a very important equipment in the papermaking equipment. The design of the airtight hood must meet the following functions:
The utility model (1) provides a closed high temperature environment to facilitate the drying of the paper, reduce the exhaust air volume, and improve the effect of heat recovery of the exhaust air from the hood. The most popular design in the world is that the dry bulb temperature in the air cover is 80 ℃ 85 ℃ and the dew point temperature is 58 ℃ 62 ℃.
The closed air cover must provide convenience for the monitoring, operation and maintenance of the paper machine, and must be able to guide the paper and change the roller conveniently.
(3) the high temperature and humidity in the airtight hood is especially easy to cause condensation, so the design of the hood must completely put an end to the condensation and dripping of the roof of the hood.
Make sure that the gas in the hood is not released to the workshop as far as possible.
The closed air cover should be able to adjust the longitudinal exhaust air volume of the paper machine to ensure the air exhaust volume of each dry part of the paper sheet.
(6) the airtight air cover should fully consider the lighting, fire protection and other facilities to meet the needs of all aspects. "
The closed air cover occupies a large area in the papermaking workshop, so the appearance of the air cover must be beautiful and durable.
The modern closed air cover for papermaking increases the functions of air supply and paper stabilization, which can balance moisture, stabilize paper and better dry the paper. Therefore, the airtight air cover has become an indispensable part of papermaking equipment.