System and method for improving efficiency of paper machine

Abstract

The invention relates to a system and method for improving the efficiency of a paper machine. The defects of low efficiency and the like in the prior art are overcome. The method comprises the following steps that S1, a fresh steam supply pipe supplies fresh steam into a drying cylinder from an inlet of the drying cylinder, the drying cylinder conducts drying operation, and a steam-water mixture obtained after the fresh steam is subjected to heat exchange by the drying cylinder is discharged into a steam-water separator from an outlet of the drying cylinder; S2, condensate water obtained after the steam-water separator separates the steam-water mixture is discharged from a condensate water discharging system, and separated steam obtained after the steam-water separator separates the steam-water mixture enters a steam recycling one-way conveying pipeline at the top of the steam-water separator; the steam compressor pressurizes the separation steam entering the steam recovery one-way conveying pipeline, the steam pressure of the pressurized separation steam is larger than the steam pressure of the new steam, and the pressurized separation steam enters the new steam supply pipe to be mixed with the new steam in the new steam supply pipe. The method has the advantage that the efficiency of the paper machine is improved.

Description

technical field [0001] The invention belongs to the technical field of steam heating and drying, and in particular relates to a system and method for improving paper machine efficiency. Background technique [0002] Steam heating and drying will use the heat pump system to heat the drying cylinder. The traditional steam heating of the drying cylinder uses new steam to perform heat exchange on the drying cylinder to achieve the purpose of heating. After the heat exchange, the steam-water mixture enters the steam-water separator. Carry out steam-water separation. For example, the Chinese patent discloses a CN102317541B-a device and method for recovering and drying tissue paper webs using steam. This method of reusing condensed water by using a heat pump can achieve the purpose of energy saving; at the same time, the Chinese patent also discloses a CN204662174U - A high-efficiency recycling system for drying cylinder steam, which uses a steam injector to mix new steam and reco...

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Problems solved by technology

[0003] Although the above-mentioned first method can achieve the purpose of saving energy, it cannot recycle the low-temperature steam after heat exchange, resulting in waste of steam; although the second method can recycle the separated steam Utilization, in this way, it uses higher pressure new steam to inject lower pressure recovered steam to obtain steam with a certain pressure in the middle, so as to achieve the purpose of "low quality high use" or waste heat utilization, but this method is bound to It will lead to a decrease in the steam pressure and temperature of the new steam, which will further lead to the mixed steam after mixing the new steam and the recycled steam, which requires more steam consumption for the heating of the drying cylinder, and the energy saving effect is not ideal.

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