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    Sources of textile printing and dyeing waste gas

    来源:admin(传梦环保整理发布)   时间:2018-08-28

    Sources of textile printing and dyeing waste gas:
    The exhaust gas from textile and dyeing industry mainly comes from two aspects:
    The first is the spinning process of chemical fiber, the two is Textile Pretreatment and functional finishing process.
    Taking the spinning process of viscose fiber as an example, the raw materials need to be made into spinning solution first, and a large amount of carbon disulfide is added in the process of spinning solution, so the harmful gases such as hydrogen sulfide, carbon disulfide and sulfur dioxide will be released during the spinning process. These harmful gases will cause great physical damage to the operators, if not effectively treated on the discharge of the surrounding environment will cause serious pollution.
    The heat setting machine is an important part of the pretreatment process of textiles. During heat setting, all kinds of dye auxiliaries and coating auxiliaries on textiles will be released, so a large number of VOCs (organic volatile compounds) will be released at the end of the exhaust pipe. These organic gases are mainly organic compounds such as formaldehyde, polybenzene and aromatic hydrocarbons.
    In the process of textile functional finishing, exhaust gas comes mainly from two links. In the hot melt dyeing process of polyester disperse dyes, high temperature results in the sublimation of some small molecules of dyes into exhaust gas. The non-ironing and flame retardant finishing of cotton fabrics have to go through the baking process. Due to the addition of some chemical additives, formaldehyde and other aldehyde gas and ammonia gas will be released during the baking process.
    Three. Textile printing and dyeing process:
    Textile printing and dyeing waste gas pretreatment equipment (dust particle removal filter, atomization spray tower, water vapor separator, high temperature cooling equipment) plasma or UV light deodorization waste gas purifier high discharge
    Simple Flow Chart of Paint Waste Gas Treatment and Industrial Waste Gas Treatment 4. Working Principle of Plasma or UV Light Deodorizing Waste Gas Purifier:
    1. The pulsed high-frequency high-voltage plasma power supply and dual-dielectric tooth-plate discharge device are mainly used to produce high-concentration ions in the form of tip discharge.
    Plasma is a kind of aggregated matter. Its high-energy electrons can break down air and exhaust gas molecules in milliseconds, and produce a series of differentiation and cracking reactions, producing high concentration, high strength, high energy active radicals and various electrons, ions, etc. When colliding with the molecules in organic exhaust gas, they will occur. It produces a series of basic physical and chemical reactions, and produces a variety of active free radicals and ecological oxygen during the reaction process, namely, atomic oxygen produced by ozone decomposition. Active free radicals can effectively destroy nucleic acids and proteins in various viruses and bacteria, so that they can not be properly metabolized and biosynthetized, thus causing their death; and ecological oxygen can quickly decompose or reduce the odor gas molecules of organic waste gases into harmless substances of low molecular weight; in addition, with the help of ions in plasma and objects of the Polymerization and adsorption can be used to treat fine organic waste gas particles as small as submicron.
    2. Using special high-energy UV ultraviolet light beam to irradiate odorous gases, the molecular bonds of odorous gases are broken down and transformed into low-molecular chemicals, such as carbon dioxide and water.
    Oxygen molecules in the air are decomposed by high-energy ozone to produce free oxygen, i.e. reactive oxygen species. Oxygen molecules need to be combined with oxygen molecules because of the imbalance of positron and positron electrons carried by free oxygen, and then ozone is produced. The free-state pollutant molecules are combined with ozone oxidation to form harmless or harmless compounds with small molecules. Such as CO2, H2O and so on. UV O2 to O- O* (reactive oxygen species) O O2 to O3 (ozone).
    Both of the above two schemes can achieve high efficiency deodorization: volatile organic compounds (VOC) and various odors can be effectively removed, and the deodorization efficiency can be up to 99%. And do not need to add any substances: only need to set up the corresponding exhaust duct and power, but also has strong adaptability: can adapt to high concentration, atmospheric capacity, 24 hours a day continuous work, stable and reliable operation advantages.
    Printing and dyeing waste gas treatment
    Adsorption catalytic combustion method
    The principle is as follows: using porous material with large surface area, adsorbing VOCs on its surface, adsorbent choosing zeolite and other materials, the VOCs in the exhaust gas are separated into clean gas and discharged directly through the exhaust canister, the first step is to remove VOCs in the exhaust gas; zeolite is made into a runner shape, zeolite adsorption saturated after. Turn into the desorption zone, use a heating gas (using benzene device exhaust heating) into the zeolite, into a catalytic burner or regenerative thermal oxidizer (RTO) catalytic combustion treatment, emissions of clean carbon dioxide and water, combustion after the production of high-temperature gas is cited as a hot fluid for use, recovery of heat energy, to achieve thermal energy recovery. The purpose of collection and utilization.
    The technology is mature and has been successfully applied to the treatment of triphenyl gas in machinery, light industry and other industries. The rotating speed of the runner is 1-8 revolutions per hour. But for the textile printing and dyeing industry, it has more advantages. It can make full use of the heat generated by catalytic combustion, and use it in the enterprise to produce economic benefits. The process features:
    (1) operation cost is low, heat recovery can reduce operation cost.
    (2) the purification rate is high, and the purification rate is over 98%.
    (3) because of low catalytic combustion temperature, no polluting gases such as NOx are produced.
    4. Automatic control and simple operation.
    Safety is high.
    The stability is high.

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