Vacuum system for paper machine

In the auxiliary system of the paper machine, the energy consumption of the vacuum system accounts for 30%~40% of the whole system, and some are even higher.

Problems facing vacuum systems

In the paper machine auxiliary system, the vacuum system occupies an extremely important position in terms of energy consumption and equipment investment.

The speed and quantitative range of modern paper machines are getting wider and wider, and the paper types are also changing with market changes. The vacuum system faces severe challenges:

(1) The vacuum system must work finely to adapt to changes in paper ration and vehicle speed;

(2) The vacuum system must be adapted to the different stages of use of the paper machine forming wire and felt;

The vacuum system must provide optimized water and electricity consumption, saving energy.

Comparison of two vacuum systems

Water ring vacuum pump vacuum system

The principle of the water ring vacuum pump will not be repeated here, and many materials have been introduced. The paper machine vacuum system is shown in Figure 1. In the actual design process, some other vacuum systems are also derived from this, but its basic core has not changed, mainly including steam-water separator, water-ring vacuum pump, vacuum pump water-ring water system ( Vacuum pump water collection tank, self-priming tank, cooling tower and other equipment).

Inverter Turbine Vacuum System

The working principle of the turbo vacuum pump: the steam-water mixture from each vacuum suction point of the paper machine enters a special steam-water separator, the liquid and the lost fine fibers are extracted by the pump installed at the lower part of the gas-water separator, and the gas enters the turbo-type vacuum pump after passing through the filter. . With the rotation of the impeller of the turbo vacuum pump, the gas enters the hole in the middle of the impeller, and is accelerated and pressurized by the radial rotation of the impeller. The turbo vacuum pump is generally used in combination with a multi-stage turbo vacuum pump and two single-stage turbo vacuum pumps to meet the vacuum requirements of different suction points of the paper machine.