Glass fiber dust bag material material, glass fiber has different chemical composition to ensure the physical and chemical properties of glass fiber products and meet the requirements of the glass fiber production process. At present, the chemical composition of domestic and foreign glass fibers can be divided into two categories: a class of aluminum borosilicate glass fibers, known abroad as E-glass; another class is soda calcium silicate glass fiber, equivalent to foreign C-glass. In the physical and chemical analysis, the glass fiber in alkali metal oxide (RO) content of less than 0.5% known as alkali-free glass fiber, alkali metal oxide (R2O) content of 0.5% to 12% for the alkali glass fiber, alkali metal oxide (R2O) content of more than 12% for the high alkali glass fiber. At present, the domestic use of alkali-free 12.5tex glass fibre yarn and medium alkali 22.5tex glass fibre yarn to produce glass fibre dust bag material. In practice, the non-alkali glass fibre dust bag material has more advantages than the medium alkali glass fibre dust bag material in terms of temperature resistance and durability. Glass fibre dust bag material performance Glass fibre dust bag material is heat resistant and can be used at temperatures from 260 to 280, which not only saves the flue gas cooling costs of the bag filter but also reduces the risk of condensation. 280°C, the temperature limit, is more than sufficient to eliminate condensation failures in all industries today. This not only creates the conditions for preventing corrosion of the baghouse and reducing the cost of equipment materials, but also avoids the failure of rising system resistance due to condensation on the surface of the filter media. After special surface treatment of glass fibre dust bag material with soft, lubricating, hydrophobic and other properties, so that the dust is easy to peel off, its dust cleaning performance than other filter media superior, only with the reverse blowing air way, can fully achieve the purpose of dust cleaning. Glass fiber dust bag material in the chemical erosion resistance, in addition to fluorine acid, strong acid, strong alkali, in addition to other media are very stable, even in the strong acid, strong alkali flue gas, the impact on its service life is also very small. From the actual measurement, carbon black flue gas concentration of SO (250 ~ 300) × 10-5, hydrogen sulfide concentration of 300 × 10- when the filter bag life can be maintained 2 ~ 3 years. In recent years, the glass fibre produced with special ingredients, after special surface treatment of glass fibre filter media, in the concentration of hydrogen fluoride 300 ~ 400) × 10- flue gas, can still be used safely.

The most practical advantages of FGL dust filter bag are high temperature resistance, good dimensional stability and high tensile breaking strength. FGL dust filter bag in chemical erosion resistance, in addition to hydrofluoric acid, high temperature strong acid and alkali, other media are very stable. The disadvantage of glass fibre is poor folding resistance, poor abrasion resistance, although not resistant to folding and abrasion, but the price is low. Temperature resistance: glass fiber itself is very high temperature resistance, up to even close to 600 degrees, but in order to ensure the softness of glass fiber folding resistance and other characteristics, in the fiber added many additives, and the temperature of these additives can only be below 280 degrees. Corrosion resistance: can withstand weak alkali, weak acid, but alkali-free glass fibre is more easily eroded by inorganic acids, not suitable for acidic environments. Hydrolysis-resistance: resistance to hydrolysis in general, especially in the role of acid and high temperature Oxidation-resistance: excellent resistance to oxidation, can resist general strong oxides Fibre characteristics: the current common use of glass fibre for alkali-free glass, a borosilicate glass, itself colorless, but due to the different colour of the treatment agent will also have a slight difference. The fiber strength is high, elongation at break is low, thermal shrinkage under, so there is a better dimensional stability, but the fiber is not resistant to folding, not wear, so not suitable for high dust concentration or high dust bag air speed occasions. Types of glass fibre dust bags According to different classification principles, the GLF dust bag material can be divided into the same series. According to the composition of glass fibre, there are two series of C-Glass and E-Glass. According to the surface treatment process can be divided into pre-treatment and post-treatment, the so-called pre-treatment glass fiber filter fabric, is the glass fiber yarn by the surface chemical treatment, and then woven into the glass fiber filter fabric; and post-treatment glass fiber felt, is the glass fiber yarn made of woven or non-woven fabrics, and then made of glass fiber filter material with surface chemical treatment. At present, domestic and foreign basically use post-processing glass fibre filter material. According to the form of yarn and fabric can be divided into glass fiber dust bag materials: GLF cylindrical filter bag, GLF flat dust filter bag cloth, GLF expanded yarn dust bag, GLF needle punching felt dust bag, at present, the international and domestic use of this classification.

The active component of commercial SCR denitrification catalysts is V2O5, the carrier is TiO2 of anatase type and WO3 or MoO3 is used as a co-catalyst. the composition and proportion of SCR catalysts varies according to the content of components in the flue gas and the guaranteed denitrification performance. The active component is the main body of the multi-catalyst and is a necessary component without which the required catalytic effect is lacking. The co-catalysts themselves are inactive or have little activity, but can significantly improve catalyst performance. Both WO3 and MoO3 have been found to improve the thermal stability of catalysts and to improve the electronic interaction between V2O5 and TiO2, increasing the activity, selectivity and mechanical strength of the catalyst. In addition to this, MoO3 also enhances the catalyst's resistance to As2O3 poisoning. The carrier mainly plays the role of supporting, dispersing and stabilising the catalytically active material, while TiO2 itself also has a weak catalytic capacity. TiO2 of the anatase type was chosen as the carrier for the SCR catalyst. Compared with other oxide (e.g. Al2O3, ZrO2) carriers, TiO2 has a strong ability to inhibit SO2 oxidation and can well disperse the vanadium species on the surface and the semiconductor nature of TiO2. The ideal coal-fired flue gas denitrification catalyst needs to meet the following conditions: (1) high activity, in order to meet stringent national emission standards, a denitrification rate of 80% to 90% is required, i.e. a high SCR activity of the catalyst is required; (2) high selectivity, the reducing agent NH3 is mainly oxidised by NOx to N2 and H2O, not by O2. The high selectivity of the catalyst helps to improve the utilisation rate of the reductant and reduce operating costs; (3) good mechanical properties, as most coal-fired power plants use a high ash arrangement, the SCR catalyst needs to be subjected to long-term abrasion by high airflow and dust, and the installation process also requires a certain degree of mechanical strength of the catalyst; (4) strong resistance to toxicity, as flue gas and fly ash contain a high level of toxins, the catalyst needs to be resistant to long-term toxic (5) Other, low oxidation rate of SO2, good chemical, mechanical and thermal stability, large specific surface area and good pore structure, low pressure drop, low price and long life for SCR catalysts. In addition, SCR catalysts are required to be simple in structure, take up less space and be easy to disassemble or fill. The main types of power plant flue gas denitrification catalysts are honeycomb, panel and corrugated, with the structures shown in Figure 1. Honeycomb catalysts, with their large surface area, high activity and small size, currently occupy 80% of the market share, followed by flat plate catalysts and the least corrugated plates.

The ptfe dust bag has a fine pore size of 0.1-3.5m and a fine pore porosity of 75-90%. Such a high microporous porosity enables tiny water and gas molecules to diffuse freely through the film's voids and therefore enables a large and dense amount of water vapour to pass freely. However, ptfe dust bags are extremely hydrophobic and water cannot pass through the microporous film. Due to the good properties of PTFE for any chemical substance, ptfe dust bags can be used in various chemical production technologies. PTFE molecules in the Fatom symmetry, C-F in the two elements covalent combination, the molecule has no free electrons, the whole molecule is neutral. This makes PTFE have excellent dielectric properties. Due to the inert fluorine shell outside the PTFE molecule, it has outstanding non-stick properties with a low coefficient of friction. PTFE has outstanding excellent overall performance, high temperature resistance, corrosion resistance, oxidation resistance, hydrolysis resistance, non-stick, self-lubricating, excellent dielectric properties, very low coefficient of friction. The ptfe cloth bag made of PTFE is mechanically soft. Has a very low surface energy. PTFE has a range of excellent properties for use. High temperature resistance: 200 to 260 degrees for long-term use. Low temperature resistance: soft even at -100 degrees Corrosion resistance: resistant to aqua regia and all organic solvents. Weather resistance: ageing life in plastics. High lubricity: small coefficient of friction in plastics (0.04 ). Non-stick: non-adherent to substances, low surface tension in solid materials. Non-toxic: physiologically inert; excellent electrical properties, ideal class c insulating material, the thickness of newspaper can further shield 1500V high voltage; smoother than ice

PTFE dust removal bags are widely used with good results, especially in large high temperature baghouse dust collectors where they are more commonly used. With this technology the production of glass fibre film filter media dust removal, low running resistance, long life, no film off phenomenon, long-term working conditions at 260 degrees (instantaneous temperature up to 300oC), all the performance of the dust bag are no change, the yield of the dust below 5um for the following 11.0 m dust bag life will be more than 2 years. The material used for the ptfe dust bag is known by the scientific name polytetrafluoroethylene, the Chinese trade name "Teflon", "Teflon", "Teflon", " Teflon" and so on. Polytetrafluoroethylene is called "King of Plastics", it is a polymeric compound made of tetrafluoroethylene which is resistant to all chemicals other than molten alkali metals, chlorine trifluoride, chlorine pentafluoride and liquid fluorine, and is unchanged by boiling in water, and is widely used in various applications where resistance to acids, bases and organic solvents is required. The ptfe bag has sealing, high lubrication non-adhesive, electrical insulation and good anti-ageing ability, excellent temperature resistance (can work for a long time at a temperature of plus 250 to minus 180). Teflon itself is not toxic to humans. Operating temperature -190 to 250, allowing for rapid cold and heat or alternating hot and cold operation. Pressure -0.1~6.4Mpa. 1)Excellent temperature resistance up to 280 degrees. 2)Due to the special molecular structure of PTFE material, it has extremely good chemical stability and corrosion resistance, which can improve the chemical attack of the filter material. 3) The non-stick, water-repellent and non-flammable characteristics of the PTFE fibre material make this fibre the most excellent filter material. 4) This type of fibre is used as a base cloth, which basically ensures that the strength does not decay during long-term use Fibre form: because of the different spinning methods, the fibre colour is divided into white and brown. White fibres are more pure, and the shape of the fibres is mostly flat, while brown fibres will contain a small amount of impurities, and the shape of the fibres is mostly round. The Fatoms in the PTFE molecule cover up the C-C bond and the C-F bonding energy is so high that it is not eroded by any chemicals except alkali metals and fluorine elements.

The way you approach your work determines the height of your life. He is not a good speaker, but a quick thinker. Since joining Yuanchen Technology in 2021, Zhang Zhang, a mechanical engineer, has never talked about suffering and fatigue, but has always been dedicated to his work and constantly innovated to promote the maintenance and upgrading of equipment. In the words of others, he is always there when there is a problem with the equipment. With him, problems are always solved. Perseverance in learning and "progressing" again and again Everyone has their own path, and everyone's path is made one step at a time by themselves. Persistence and perseverance are the distinctive character traits of Zhang Zhang. Since he started working, he has always faced up to difficult problems on the road of equipment maintenance, improvement and design, and has been constantly researching and exploring. The year 2022 is a year full of opportunities and challenges. Under the leadership of Mr Xu, Zhang Zhang is deeply aware of the importance of learning. "As a technician of the new era, it is not only important to know what you know, but also to know what you know." Zhang Zhang recalls that since coming to Yuanchen Technology, he gradually felt that he had a lack of knowledge and understanding. Experience is accumulated through continuous work and learning, and when he encountered problems he did not understand at work, he asked his teachers for advice again and again, and when he returned home from work at night, he carefully thought back on what he had learned during the day and recorded his feelings. As time went on, he recorded more and more of his thoughts and his professional skills kept increasing. The strength of the craftsman lies in his rigorous demands on himself. As his skills continue to improve and his operations become more skilled and stable, Zhang Zhang keeps learning other job skills and practising his skills on the basis of his ability to improve this job. In order to let their skills keep pace with the development of the times, do not drag the company's legs. "Doing work, there is no best, only better!" Since entering Yuanchen Technology, Zhang Zhang has always adhered to this credo. "When I first started working, I didn't have the concept of craftsmanship in my head, but I thought that since I had chosen this line of work, I should be down-to-earth and work with my heart." Zhang Zhang believes that "craftsman" is a person who works seriously every day, who is down-to-earth, who is very dedicated to his work, especially to innovation, whether it is technology, mentality or a high level, who faces problems and difficulties head-on, "if he can't solve them, he can look up information, find colleagues, ask experts and so on, in short, that is By all means, get it sorted out." Solving a problem at the front line Mechanical engineers are like doctors, they find more fulfilment when they treat their machines as patients. While some time is spent on ...