CO-SCR technology reduces NOx to N2 by using carbon monoxide (CO) as a reducing agent. CO is a reducing gas that is widely present in sintering and coking flue gas and vehicle exhaust. It is also a colorless and odorless toxic gas, which can cause poisoning when the CO concentration in the air exceeds 0.1%. Using CO instead of NH3 for selective catalytic reduction of NOx cannot only reduce pollution control costs but also eliminate NO and CO in the flue gas, achieving waste treatment through waste. CO-SCR Technology Principle The reaction process of CO reducing No can be divided into four steps: adsorption of reactant molecules (CO and NO first undergoes gas-phase diffusion and contact with the catalyst surface, and are adsorbed by the unsaturated metal active sites on the catalyst surface, forming NO(a) and CO(a) species, while CO and NO gradually diffuse into the pore structure of the catalyst as the reaction continues); dissociation of adsorbed molecules (when the reaction reaches a certain temperature, active NO(a) is decomposed into N(a) and O(a) species); recombination of surface active substances and desorption of product molecules (CO(a) is oxidized by the active O(a) species to generate CO2, while the active N(a) species combines to generate N2, and the final products CO2 and N2 generated by the reaction are discharged from the flue). Leave us a message now and get the technical specifications of the honeycomb catalyst： ↓ ↓ ↓ ↓ ↓ Contact Us Now! Meanwhile, the combination of other active species can produce by-products such as N2O and O2, and the specific steps are as follows: Adsorption of reactant molecules: CO(g) → CO(a) NO(g) → NO(a) Dissociation of adsorbed molecules: NO(a) → N(a) + O(a) Recombination of surface active substances and desorption of product molecules: CO(a) + O(a) → CO(g) N(a) + N(a) → N2(g) N(a) + NO(a) → N₁O(a) N:O(a) → NO(g) N.O(a) → N₂(g) + O(a) CO-SCR Catalysts The catalyst is the key material in the entire catalytic reaction system. Currently, in the CO-SCR denitration technology that uses CO as a reducing agent to remove NOx, commonly used catalysts include noble metal catalysts, single transition metal catalysts, and composite transition metal catalysts. Noble metal catalysts generally refer to platinum, palladium, rhodium, iridium, silver, etc. Noble metals are often present in a nanometer state as catalysts, or they can be supported on carriers or exist on molecular sieves by ion exchange. The oxides of non-noble metals such as copper, cobalt, iron, chromium, and manganese have good activity for removing nitrogen oxides. Single metal catalysts often have the disadvantages of a narrow reaction temperature window, poor reaction activity under oxygen-rich conditions, and poor resistance to SO2 poisoning. Composite metal catalysts doping appropriate additives can improve these problems to some extent. Compared with single transition metal oxide catalysts, bi-component or multi-component composite transition meta...

The bag filter plays a crucial role in industrial production by effectively reducing the pollution caused by dust and harmful gases generated during the production process. However, during the use of filter bags, issues such as mechanical damage and chemical corrosion may arise, thereby impacting their dust removal efficiency. This article will focus on analyzing and listing factors that contribute to filter bag damage. 1. Mechanical damage The mechanical damage of the filter bag primarily manifests as the destruction and detachment of the non-woven layer of the filter material. This phenomenon is mainly caused by the uneven distribution of the dusty gas, resulting in increased pressure on the surface of the filter bag due to the filtered airflow entering the bag filter. This increased pressure leads to flushing and subsequent damage to the non-woven layer. Improper installation of the filter bag during replacement can also cause continuous rubbing and damage to the outer surface of the non-woven layer during use. Alternatively, improper installation of the spray pipe, specifically if it is not installed vertically, can result in damage occurring at a position 30-40 cm from the outlet, leading to a reduction in its filtration performance. The specific areas of damage include the outlet, body, bottom, and base of the bag. Filter Bag Mechanical damage You can browse our filter bag product page, learn about our products and leave a message to get a quotation. We will recommend the product suitable for you according to the details of the working conditions you provide. ↓ ↓ ↓ ↓ ↓ Dust Filter Bags Product Page 1.1 Damage to the bag mouth occurs at a position of 30-40 cm from the bag opening, primarily due to the blowing open and detachment of the bottom layer of the filter material. This issue is mainly caused by misalignment of the spray pipe, excessively high compressed air pressure, and deformation of the flower plate. It is crucial to ensure high-quality installation during the filter bag installation process. 1.2 Damage to the body of the bag: The portion of the filter bag that comes into contact with the equipment experiences constant rubbing during the high-speed operation of pulse spraying, resulting in damage to the bag body, which is primarily characterized by noticeable wear marks. During installation, it is important to ensure that the filter bag complies with the specifications and size of the equipment. 1.3 Bottom damage: The primary cause of damage at the bottom of the filter bag is long-term wear. This occurs due to the small size of the bottom of the bag cage where the filter bag is installed in the bag dust collector, or when the purchased filter bag is too long, causing the bag cage to only support the bottom of the filter bag. During the filtering and cleaning process, the extensive operational range leads to damage at the bottom, or the failure to timely filter or clean results in excessive dust accumulation in the filter bag, lead...

Dust filter bags are suitable for medium to low temperature flue gas (180~290℃), but when the flue gas temperature is high, it is necessary to lower the temperature of the flue gas before it enters the bag filter by using processes such as water cooling or air cooling to protect the filter bags from damage due to high temperature. In recent years, with the continuous improvement of nitrogen oxide emission standards in China (Due to strong environmental regulation by the government and strict punitive measures, which have increased the emission costs for businesses), the integrated denitrification-dust removal bag filters have started to receive attention. The key technology of this equipment lies in the development of "catalyst-coated filter bags" that are more suitable for bag filters and can meet various operating conditions. This has been driven by the need to develop a new generation of dust filtration products at an accelerated rate. The current mainstream theoretical view is that catalysts such as manganese-based/vanadium-based catalysts are adhered to the surface of filter bags, and ammonia gas is injected into the interior of the dust collector (or at the inlet of the dust collector). Through the action of the catalyst, the ammonia gas reacts with nitrogen oxides in the flue gas to generate nitrogen gas. This principle is similar to the Selective Catalytic Reduction (SCR) technology, where under the action of a catalyst, the reducing agent NH3 selectively reduces NO and NO2 to N2 under temperature conditions of 180-400°C, while hardly undergoing the oxidative reaction of NH3 with O2. This reduces the consumption of the reducing agent, helps control ammonia leakage, and lowers operating costs. Over the years, some Chinese experts and scholars have been devoted to the research and development of catalyst-coated filter media. Among them, a group of academicians from the Chinese Academy of Sciences advocate the use of surfactant dispersion method, coating method, and suction filtration method to load manganese dioxide/polyacrylonitrile catalyst onto PPS filter media. The catalyst loading amount is approximately 44g/㎡. Under laboratory conditions, PPS filter bags with catalyst coating achieved a denitrification efficiency of up to 80% at 180°C. The second viewpoint advocates the in-situ growth of three different catalyst components, namely Mn-CeOx, Mn-SnOx, and Mn-Ce-SnOx, on the surface of PPS fibers through mechanisms related to redox reactions. The results show that the three different catalyst-coated filter media, under laboratory conditions, can achieve denitrification rates of up to 100% when the preparation conditions include a KMnO4/PPS mass ratio of 0.6 and a denitrification reaction temperature of 180°C. Furthermore, even the filter media coated with Mn-Ce-SnOx catalyst can achieve a denitrification rate of 100% at a reaction temperature of 120°C. In addition, some experts advocate the use of ultrasonic dispersion method to attach 6%...

In the process of dust removal, as dust-laden gas particles flow through the dust collector, the dust particles are captured on the outer surface of the bag, while the clean gas passes through the filter media into the bag. The dust cage inside the dust collector bag provides support, prevents bag collapse, and aids in the removal and redistribution of the dust cake. Post-treating the dust bag is crucial for certain special working conditions. The post-treatment procedures are categorized as follows: 1. Singeing and calendering treatment This treatment mainly involves exposing the fabric surface above the conveyor to fire, burning off lint, and then using high-temperature rollers to iron the fabric surface, making it smooth and easier to remove ash. This not only enhances the filter media's ash cleaning performance but also enables the collection of fine dust. Singeing and calendering treatment Explore our product page to discover the material supply range of dust filter cloth: ↓ ↓ ↓ ↓ ↓ PTFE / PPS / Nomex / Polyester / Acrylic / Fiberglass / FMS / Polyamide 2. Antistatic treatment Some types of dust can easily ignite when exposed to sparks in certain concentrations. Therefore, flammable or explosive dust requires anti-static treatment using needle felt filter media. Anti-static filter media incorporates conductive fibers or conductive yarn woven into the filter media to impart overall conductivity. This enables static electricity to flow through the filter media, guiding it to the dust collector box and grounding, thereby preventing explosions caused by static sparks. Antistatic treatment 3. Water and Oil - proof treatment The needle-punched felt filter media is treated with fluorocarbon resin and PTFE, making the surface of the filter bag hydrophobic. This creates a lotus leaf-like effect, causing water droplets to roll off the fabric surface, enhancing dust trapping and preventing issues like bag sticking and corrosion caused by dew in situations with significant temperature differences. Water and Oil - proof treatment Interested in knowing which international customers Yuanchen Technology has? Browse our project case page to learn about the distribution of some of our customers. ↓ ↓ ↓ ↓ ↓ Overseas projects The surface of the filter bag is made hydrophobic, allowing water droplets to roll off the fabric. This facilitates effective dust capture and minimizes problems such as bag sticking and corrosion resulting from dew formation in conditions of significant temperature variation. 4. Easy clear ash treatment Generally, the mirror treatment or the addition of a fine denier fiber surface layer needled onto the fabric enhances its dust cleaning performance and enables it to withstand higher filtration wind speeds for extended periods. 5. PTFE lamination treatment PTFE (Polytetrafluoroethylene) lamination treatment is a process in which a layer of PTFE is applied to the surface of a material or substrate. PTFE is a synthetic fluoropolymer known for...

The fabric design of dust filter bags should prioritize high efficiency filtration, easy dust stripping, and durability. Dust filter bags are crucial components in dust collectors. The selection of dust filter bags depends on factors such as the nature of the dust, dust cleaning method, and dust gas composition, thus requiring different considerations. 1. According to the requirements of the working conditions to choose the cost performance of the appropriate dust filter bags. 1.1 Gas temperature. Gas temperature below 130 ℃ choose room temperature dust filter bag, temperature between 130 ℃ -260 ℃ choose high temperature dust filter bag. 1.2  Gas humidity. Dust-containing gas is divided into three states according to the relative humidity: dry gas (relative humidity below 30%), general state (relative humidity between 30%-80%) and high humidity gas (relative humidity of 80% or more). When the gas humidity is high, you should choose a laminated waterproof cloth bag. 1.3 The chemical nature of the gas. In a variety of furnace flue gas and chemical waste gas, often containing acids, alkalies, oxidizers, organic solvents and other chemical components. Where to choose the filter bag should be based on the chemical composition of the flue gas contained in a reasonable selection of acid-resistant alkali-resistant antioxidant dust filter bag. 2. According to the special nature of dust selection of dust filter bags. 2.1 Dust wettability and adhesion: for hygroscopic and strongly adhesive dust, it is recommended to select a dust filter bag with waterproof laminated filter media. 2.2 The combustibility and charge of the dust: If the dust is flammable, it is recommended to choose a dust bag with flame retardant properties. Anti-static dust filter bags are specifically designed for dust with electrical charge. 3. According to the dust collector cleaning way to choose dust filter bags. 3.1 Mechanical vibration-class bag filter: It is necessary to choose a dust filter bag with a thin and smooth filter material and a soft texture, which facilitates the transfer of vibration waves. 3.2 Reverse air cleaning bag filter: Select a filter bag with a soft texture, stable structure, and good wear resistance. 3.3 Pulse bag filter: Typically utilizes cylindrical filter bags with a frame. It is important to select thick, wear-resistant bags with strong tensile strength. You can directly consult our sales engineers for free consultation services regarding your dust filtration projects. ↓ ↓ ↓ ↓ ↓ Contact us now! Founded in 2005, Yuanchen Technology focuses on technology development and application in the field of environmental protection, pioneering and innovating in industrial flue gas filtration, denitrification, circular economy, intelligent environmental protection, etc. It is committed to the frontier of industry technology and promotes the integration of new business models in the environmental protection industry, and is an enterprise with the qualification of R&...

The cement production process produces a large amount of dust with high temperature, high humidity and corrosive gas, and the dust concentration is high and the temperature fluctuates widely, only the glass fiber filter material with high temperature resistance, corrosion resistance and anti-condensation can meet the needs of cement industry dust removal. In the process of cement production, the chemical composition, physical properties and working conditions of the flue gas dust at different dust raising points are different; secondly, the filtration method, dust cleaning method and filtration air speed of bag filter in different forms are very different. The glass fiber filter material has been researched and developed for decades, and its types are increasing and more specialized and targeted. Only according to the actual use point of the working conditions, choose the appropriate filter media, in order to meet the needs and play the role. This paper briefly describes the basic performance of glass fiber filter materials, introducing several typical examples of application. 1. The basic performance of glass fiber filter materials 1.1 The material of glass fiber filter material Glass fibers can be divided into two categories in terms of their alkali metal oxide content in the glass composition, alkali-free glass fibers (E - fiberglass) and medium alkali glass fibers (C - fiberglass). The difference in alkali metal oxide content affects the production process of glass fibers and determines the performance of glass fibers and their products. Alkali-free glass fibers can be produced with a single fiber diameter of 8 to 9μ. The difference in fiber diameter, woven into the same thickness of glass fiber cloth, the strength, wear resistance, folding and other properties vary greatly. Different glass fiber material will affect its use temperature, alkali-free glass fiber filter material can be used for a long time at a temperature of 280 ℃, instantaneous (within 1 hour) temperature resistance of up to 350 ℃, while the use of medium alkali glass fiber filter material temperature is only 260 ℃, instantaneous temperature resistance of 300 ℃ or less. 1.2 The fabric structure of glass fiber filter material Glass fiber filter material permeability, filtration efficiency are closely related to its fabric structure, fabric structure is divided into three categories: twill, satin, weft two heavy. In the dusty flue gas, the same fabric structure, the permeability of glass fiber expanded yarn filter material is higher than that of continuous glass fiber filter material, and the permeability of glass fiber needle-punched felt material is the highest. 1.3 The thickness of glass fiber filter material Glass fiber filter material thickness (sometimes measured by the mass per unit area) will determine the fracture strength of this filter material and the filtration air speed used, and will also determine the radial fracture strength of alkali-free continuous glass fibe...