Method for continuously preparing pre-oxidized felt

Abstract

The invention discloses a method for continuously preparing a pre-oxidized felt, which comprises the steps of A, carrying out low-temperature treatment, to be specific, conveying raw materials into alow-temperature hearth, circulating hot air, introducing both steam and an atomizing assistant, and starting a low-temperature cyclization reaction; B, carrying out medium-temperature treatment, to bespecific, conveying raw materials into a medium-temperature hearth, circulating hot air, introducing both steam and an atomizing assistant, and starting a primary cyclization reaction; and C, carrying out high-temperature treatment, to be specific, conveying raw materials into a high-temperature hearth, circulating hot air, and allowing the raw materials to rapidly pass through to arrive at pre-oxidation of the raw materials. The advantages of the method include increase in production efficiency by 2-3 times, and hot air circulation accompanied with steam to increase heat penetration, and thereaction rate is increased by the atomizing assistants, and the risk of ignition caused by reactive heat release in the fiber felt is avoided; and meanwhile, the strength of the obtained polyacrylonitrile pre-oxidized felt fiber is increased by 20-30%, the strength of the fibers in the pre-oxidized felt is balanced with the strength of the fibers on the surface, and the pre-oxidation degree is moderate.

Description

technical field [0001] The invention relates to the technical field of pre-oxygenated felt preparation, in particular to a method for continuously preparing pre-oxygenated felt. Background technique [0002] With the development of the economy, the demand for electricity is also increasing. Although traditional thermal power generation can meet the demand for electricity, it is accompanied by a large amount of dust pollution while generating electricity. With the improvement of environmental protection requirements, new solar power generation and wind power generation have gradually replaced thermal power generation as non-polluting power generation methods, especially solar power generation has gradually entered the market and is accepted by people. [0003] The production temperature of single crystal furnace and polycrystalline ingot furnace, which is a special equipment for solar power generation, is one of the important reasons for the increase in cost, while the carbon...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for continuously preparing pre-oxygenated felt, which solves the problem that polyacrylonitrile pre-oxidized can not be continuously prepared at the present stage, and it is easy to catch fire during the pre-oxidized process, and the produced polyacrylonitrile pre-oxidized felt has poor performance , Insufficient oxidation, product shedding, wrinkles and other problems

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