Felt or needlefelt filter bags are versatile and come at a moderate cost. Effective on solid and deformable particles, they offer deep filtration. They are available in several materials: polypropylene, polyester,acrylic, polypropylene,pps,ptfe,pps+ptfe,fms(achieve all kinds of non woven felt mixed), nomex,aramid,fiberglass… Filtration ratings from 0.5 to 200µ.

The problem of particulate pollution is becoming more and more serious, bag dust removal technology has been widely used, and the use and demand of filter materials are increasing. It is understood that currently in the field of industrial dust removal, the main battlefield of governance is basically delineated in thermal power, metallurgy, cement, etc., and the mainstream governance technologies are electrostatic dust removal and bag dust removal. Comparing these dust removal technologies, bag dust removal is the most widely used and fastest growing dust removal technology because of its stable and efficient dust removal function in a wide range of particle sizes and high dust removal efficiency for PM2.5. The dust filter bag is the core component of the bag filter. The variety, quality and technical level of the filter material are important conditions for the successful application and rapid development of the bag filter. The development and progress of bag filter is in the final analysis the development and progress of filter material. Many domestic scholars are devoted to the research on the dust removal efficiency of filter bags, but they have ignored the recycling of filter bags after use. The amount of filter material used in the bag filter every year corresponds to how much waste filter material will be replaced and waited for treatment. The problem of waste filter material recycling cannot be delayed.

The application fields of dust collection bags are very wide. Today, let me talk about the selection and application scenarios of dust collection bags in the carbon black industry. First of all, we need to understand the characteristics of carbon black flue gas: the gas after carbon black is separated from the flue gas. Exhaust gas contains a small amount of flammable gas components in addition to a small amount of carbon black. It is allowed to be directly discharged into the atmosphere, and it can also be reused as a secondary energy source. The black powder solid produced by the incomplete combustion and thermal cracking of carbon black, the particle size of the particles is very small, usually 20-140nm, and the existing forms are mainly aggregates. There are 4 types of emission locations for carbon black dust: main bag filter, exhaust bag filter, reprocessing bag filter exhaust, and dryer fire box exhaust. The requirements of carbon black flue gas for dust removal cloth bag filtration: higher strength of dust removal cloth bag; better air permeability; higher dust removal efficiency; higher temperature resistance; better corrosion resistance, especially acid resistance; better cleaning Ash performance; The influence factors of the selection of dust collection bag on the flue gas emission: different types of filter materials have different filtering accuracy. Generally speaking, the filter accuracy of the dust filter bag is in order: open width <needle felt filter material <bulk yarn filter material <membrane filter material; the effect of dust removal method on flue gas emission: under the same conditions, the pressure of dust removal The higher the value, the greater the impact on dust emissions; the impact of dust content in flue gas on flue gas emissions: under the same conditions, the higher the cleaning pressure, the greater the impact on dust emissions; the production level and sealing performance of dust removal equipment , Welding level and pipeline tightness all directly affect the flue gas emission concentration. Generally recommended to use PTFE dust bag, also known as "Plastic King" is a polymer compound made of tetrafluoroethylene through polymerization, with excellent chemical stability, corrosion resistance, airtightness, high lubrication, non-sticking, and electrical insulation. And good anti-aging endurance. High temperature resistance-the working temperature can reach 260℃; corrosion resistance is inert to most chemicals and solvents, and can withstand strong acids and alkalis, water and various organic solvents; weather resistance has aging life in plastics; high lubrication is solid The material with the coefficient of friction in plastics; non-adhesion is the small surface tension of solid materials and does not adhere to any substances.

Boilers are the industry with the widest range of dust collectors on the market. The function of the boiler dust collector bag is to collect the flue gas and dust. Long-term use will cause a lot of dust to accumulate on the surface of the dust collector, so it is better to deal with it on time. The dust removal efficiency. The following centralized methods are mainly adopted. Dust removal: Use high-frequency vibration to remove the larger dust particles entering the wall of the dust collector bag as much as possible, and will not affect the entanglement fastness of the fiber, and maintain a good dust removal of the dust collector bag. Chemical experiment processing: extract cloth bag samples, use professional equipment to test the oily content of the filter bag, so as to select suitable washing materials and clean the baghouse filter bag to the greatest extent without causing any damage to the filter bag. Cleaning: Choose appropriate washing materials and strictly proportion, clean with low temperature water, uniform water flow, moderate strength, and no mechanical damage to the dust collector bag. Drying: Use hot air drying at around 110℃ to maintain the dimensional stability of the dust collector bag. After drying, the dust collector bag will not be deformed or retracted. Repair: Repair the damaged filter bag due to abrasion and holes caused by use to ensure a high recycling rate. Detection: Use the instrument to detect the physical indicators of the cleaned dust collector bag to ensure that the cleaning quality meets the requirements. The dust collector bag after the above process treatment and cleaning can fully meet the previous use requirements. The material of the boiler dust collector bag is cloth or felt woven from synthetic fiber, natural fiber or glass fiber. Sew the cloth or felt into a cylindrical or flat filter bag as needed. According to the nature of the flue gas, the filter material suitable for the application conditions is selected.

The design of the fiber fabric of different dust-removing bags is to pursue high-efficiency filtration as much as possible, and pursue a longer service cycle. So how to choose the right dust collection bag? The baghouse bag is a key component of the bag filter. Generally, it needs to be determined according to the acid-base performance of the dust, the chemical nature of the gas containing the dust, the temperature of the working condition, etc., so it is different for different working conditions. The focus of selection is also different. According to the nature of the gas under the working conditions, select the suitable dust bag that is resistant to high temperature or humidity Temperature: The temperature is lower than 130 degrees, you can choose the conventional bag house filter bag such as polyester dust removal bag, the temperature is greater than 130 degrees, you need to choose high temperature dust filter sleeve, such as flumesi dust bag, PTFE dust bag, etc. Humidity: The choice of gas humidity. The product engineering department of Xinwei Environmental Protection, based on actual working condition experience and test conclusions, when the relative humidity of the gas in the working condition is greater than 30%, we should choose a waterproof cloth bag with a film. Acid and alkali: Fully consider the acid and alkali properties in the working conditions. Various types of kiln boilers often contain acid and alkali. The performance is different and the corrosive working conditions. Therefore, it is necessary to choose different use of acid and alkali resistance or Anti-oxidant dust bag. The baghouse filter sock is selected according to the special nature of the dust. 1. The wettability and adhesion of dust. If the dust is dust-absorbing and highly adhesive, choose a dust-removing filter bag with a waterproof membrane filter material. 2. The combustibility and nuclear power of dust. Certain dusts are flammable, and flame-retardant dust collection bags should be selected. Dust filter bags are specially used for nuclear power dust. Select the dust bag according to the dust removal method of the dust collector. 1. Mechanical vibration type bag filter. It is required to choose a filter material that is thin and smooth, with a soft texture, and is conducive to the transmission of vibration waves, such as PTFE dust filter fabric bag. 2. Back-blowing bag type dust collector. Pulse bag filter. The outer filter round bag with frame is usually used. It is required to choose thick, wear-resistant, and strong tension resistance. For example, Metas dust filter bag and so on.

When choosing a dust filter bag, you need to pay attention to many factors: such as the material of the dust collector bag, the selection of working conditions, and the size design. Wet and dry use, efficiency level, space limitation, pressure level, energy consumption, etc. Another question that engineers must consider is whether to purchase an off-the-shelf dust removal system or configure a custom-designed solution for your facility. This issue requires careful consideration and careful review of the advantages and disadvantages of each method. Requirements for the selection of dust collection bag One of the most important factors in the question of whether it is customized or ready-made is the processing requirements. For example, if exhaust gas must contain particulate pollutants below a certain threshold, and you choose to use an off-the-shelf solution, it may not meet these requirements. Requirements may include: requirements for prohibiting the use of silica dust, requirements for the removal of explosive dust and particulate matter such as flour, and prohibitions on the discharge of heavy metals, toxic gases and environmental pollutants into the air. These may require specialized filters, airflow patterns, physical space limitations, and other considerations that many off-the-shelf systems may not be able to accommodate. Unusual application of dust collector filter bag A special way to request a customized solution might be if material recovery is required. For example, your setup involves the use of titanium or other precious metals that have been cut, polished or otherwise atomized during processing. In these cases, the dust generated is more than just waste. On the contrary, it is a valuable material, and its recovery is essential. For these settings, material recycling requires a higher level of equipment design. The customized solution provides the opportunity to use very special filters/elements, pre-cleaners, intake and exhaust devices and dust collectors to ensure the filtration and capture of metals. Off-the-shelf systems may lack these necessary components.