Hot-air drying system of paper machine

Abstract

The invention relates to a hot-air drying system of a paper machine. The hot-air drying system comprises a flash tank, a heat pump, a dry-side heat exchanger, a wet-side heat exchanger and connecting pipelines, wherein an air inlet of the dry-side heat exchanger and an air inlet of the wet-side heat exchanger are connected with a main steam inlet pipeline, air exhaust pipelines at air outlets are respectively connected with the flash tank, the heat pump is connected with the flash tank, a main steam pipeline of the heat pump is connected with a drying cylinder, and high-pressure steam is guided to spray by the main steam pipeline so as to guide secondary steam in the heat pump into the drying cylinder. Compared with the prior art, the hot-air drying system provided by the invention can reduce the steam usage amount of the heat exchangers, reduce the quantity of condensation water of the flash tank after the steam enters into the heat exchangers, improve and enhance the drying efficiency, and appropriately enhance the speed of the paper machine, thereby achieving the aims of increasing production and reducing cost.

Description

technical field [0001] The invention relates to the field of papermaking drying, in particular to a paper machine hot air drying system. Background technique [0002] In the prior art, the hot air drying system of the paper machine is divided into heat exchanger air hood drying and drying cylinder direct steam inlet drying, and the air hood is further divided into dry side air hood and wet side air hood; in production, according to the needs of paper types, Normally, it is necessary to adjust the temperature of the dry-side and wet-side gas hoods to about 130°C, and the inlet steam pressure of the dryer is usually 0.28-0.36MPa; [0003] The main working principle of gas hood drying is to use the hot air generated in the gas hood to dry the whole wet paper web entering the drying cylinder, that is, heat convection. Part of the exhaust gas withdrawn from the gas hood can be added with some fresh air, and then passed through the exchange again. The heater is heated and recycle...

AI Technical Summary

Problems solved by technology

[0004] The OCP1# paper machine belongs to the type of paper machine that has been producing high-weight household paper. It mainly produces paper towels and high-weight toilet paper. Due to design problems, it has been plagued by the following problems: ①The drying efficiency is not high; ②The steam consumption per ton of paper High, greater than the target steam consumption of 3.3 tons of steam / ton of paper, about 3.35-3.50 tons of steam / ton of paper

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