SU74833A1 - Method of drying cardboard and paper with superheated steam - Google Patents

Description

In the production of roofing and bituminous materials, the drying part of the cardboard machine is a very valuable piece of equipment.

At the same time, a significant part of the costs in the production of cardboard falls on the cost of steam consumed by the drying part of the cardboard machine.

The proposed method of drying cardboard makes it possible to increase the productivity of the drying part of the cardboard machine by up to 200% and reduce steam consumption per ton of cardboard by 3-4 times.

In order to increase productivity, it is recommended to heat up to 120-150 ° C the vapor of the vapor evaporated as a result of cardboard without access to air at atmospheric pressure. For this, the drying part of the cardboard machine (Figs. 1 and 2) covered the chamber B / s with thermoisolation. mi walls 2, equipped with w; el. mi 3, 4 for the entrance and exit heathta cardboard. Air from the chamber / at the starting moment is removed by means of extruding it with live steam introduced into the chamber. In order to release air in the chamber under the machine, a tray 5 is made, leaving the chamber in | At the bottom 6. For adjusting the Body, Release 7, 1949

LITERS AND INCLUSIONS The tray is supplied with a gate valve 7. When operating in a chamber, the atmospheric pressure is maintained with an excess of millimeters of water in excess of a millimeter of water, which prevents air from entering the chamber through the slots.

Steam enters the chamber through the steam line 8 with the valve 9.

Overheating of the vapor of the vapor is achieved by the open heat-radiating surface of the drying cylinders of the machine, closed into the chamber and additional heating of the vapor of the vapor.

For the latter, vapor vapor suction is carried out through the steam line 10 from the lower zone of the chamber, then the nepenj CK of these vapors is made through the steam superheater (heater) through the fan 12 and the subsequent introduction of superheated vapors into the chamber via the steam line 13. The heater 11 is fed with steam of higher parameters from the high line pressure 14.

For periodical maintenance of the chamber, hermetic doors and lighting are available. Food steam cars and condensate drain normal.

To reduce the steam consumption in the dryer section of the cardboard machine, regeneration is offered. 513

evaporating vapors resulting from drying. For this purpose, the vapor pairs that are taken out of the chamber are ejected through the steam line 15 with a steam jet injector J6 of the PKTI type. In the steam-jet injector 36, these pairs are transformed to the required parameters by means of high-pressure steam supplied through the steam line 18, i.e. up to 3-3.5 atm and then injected into the machine through the steam lines 17 to heat the cylinders, etc.

The subject of the invention. Method of drying cardboard and paper with superheated steam without air in the drying part of the cardboard and

paper machines covered in a thermally insulated and sealed chamber that has a longitudinal channel with a gate passing under it, using steam regeneration released from the paper during the drying process, by heating it with a fan and secondary pumping into the chamber by a fan, as well as use of a steam jet injector, using excess secondary vapors for various technological needs, characterized in that the secondary vapors regenerated by the steam jet injector are used in the drying chamber for heating the drying cylinders.

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