The production process of petrochemical, paint, electroplating, printing, coating, tire manufacturing and other industries involves the use and emission of organic volatile compounds. Harmful organic volatiles are usually hydrocarbon compounds, oxygen-containing organic compounds, chlorine, sulfur, phosphorus and halogen organic compounds. If these volatile organic compounds are directly discharged into the atmosphere without treatment, they will cause serious environmental pollution. Traditional organic waste gas purification and treatment methods (such as adsorption, condensation, direct combustion, etc.) all have shortcomings, such as easy to cause secondary pollution. In order to overcome the shortcomings of traditional organic waste gas treatment methods, people use catalytic combustion methods to purify organic waste gas. The catalytic combustion method is a practical and simple organic waste gas purification and treatment technology. This technology is a method of deeply oxidizing organic molecules on the surface of the catalyst and converting them into harmless carbon dioxide and water, also known as catalytic complete oxidation or catalytic deep oxidation. . The invention is a catalytic combustion technology of industrial benzene waste gas, which uses a low-cost non-precious metal catalyst. The catalyst is basically composed of CuO, MnO2, copper manganese spinel, ZrO2, CeO2, zirconium, and cerium solid solution, which can greatly reduce catalytic combustion. The reaction temperature can be improved, the catalytic activity can be improved, and the life of the catalyst can be greatly extended. The invention relates to a catalytic combustion catalyst, which is used for the purification and treatment of organic waste gas. The coating of the catalyst is composed of composite oxides formed by Al2O3, SiO2 and one or several alkaline earth metal oxides, so it has good high temperature resistance.

  Principle: Using a microscope to observe the longitudinal and cross-sectional morphological characteristics of fibers to identify various fibers is a widely used method.   Method: Take a small bunch of samples, straighten them by hand, clip about 10 fibers and place them on a glass slide, cover with a cover glass, and drop a drop of distilled water on each of the two diagonals of the cover glass to make the cover glass. Glass slides and glass slides are adhered to increase the clarity of the field of view, and the longitudinal cross-sectional characteristics of the fibers are observed. Use Y172 fiber slicer to make fiber cross-sectional slices and observe fiber cross-sectional characteristics.   Scope of application: It can not only identify single-component fibers, but also identify blended products mixed with multiple components.   Characteristic example: Most of the cross-sections of PPS, polyester and other fibers are circular, longitudinally smooth, and rod-shaped; PTFE fibers are flat; the cross-section of imported P84 fibers shows a trilobal structure under the microscope.

The control of ammonia slip rate is very important in SCR denitration. Because if the control is not good, not only will the denitration cost increase, but also the safe operation of the unit will be threatened. The main reducing agent is ammonia water, the reaction temperature is 320-400 °C, and the injection position of the reducing agent is mostly selected in the flue between the economizer and the SCR reactor. During the operation, there are various reasons that cause a small amount of ammonia gas to escape and escape. Oxidation reaction with SO2 in flue gas forms ammonium bisulfate, resulting in the phenomenon of dust bag sticking. The long-term operation of dust filter bag in the state of sticking bags will greatly increase the load of the induced draft fan, resulting in high energy consumption, and frequent dust cleaning will greatly Reduce the service life of the dust collection filter bag. Analysis of the causes of ammonia escape The ammonia slip rate is an important parameter that affects the operation of the SCR system. Generally speaking, it is the volume ratio of the NH3 that is not involved in the reduction reaction at the outlet of the SCR denitration process to the total amount of flue gas at the outlet. In the SCR denitration process, the main reasons for the high ammonia slip rate are: ① The denitration flue flow field is uneven, resulting in a high ammonia escape rate caused by the excessive amount of local ammonia injection; ② After the catalyst is poisoned, the catalyst reaction activity decreases, resulting in excessive ammonia injection during the denitration process; ③ The unit operates at low load for a long time, and the inlet temperature of the SCR system is low, resulting in a low reaction conversion ratio and a high ammonia consumption. Mechanism of ammonium hydrogen sulfate paste bag SO2 will be produced in the process of burning coal in the boiler, and a very small amount of SO2 will be oxidized to SO3. Due to the escape of ammonia during the denitration process of SCR flue gas Inevitably, plus the water vapor present in the outlet flue gas, the three will react as follows: NH3+SO3+H2O→NH4HSO4 Ammonium hydrogen sulfate (NH4HSO4), also known as ABS, is liquid at the dew point temperature (about 145-150°C). ABS is a highly viscous liquid substance, which is easy to condense and deposit on the surface of the heat exchange element at the cold end of the air preheater. When it is large, it flows in the direction of the flue gas, and the ammonium bisulfate passing through the bag dust removal area adheres to the surface of the dust bag, and continuously absorbs the fly ash particles in the flue gas, eventually forming a thick ash layer. The ammonium hydrogen sulfate and fly ash in the inner layer will be heated to gradually solidify, forming cement block-like plate agglomeration on the surface of the dust bag, which will greatly reduce the air permeability of the dust bag.

Then the last issue continues to introduce the main application characteristics of the new bag filter compared with the traditional filter: (5) Due to aging during operation, cleaning and scouring, collision friction, oxidative corrosion, etc., the dust removal filter bag is prone to damage, and the current technical conditions cannot repair and reuse the damaged part, so even a small damage will lead to a dust removal. Scrap of cloth dust collector bags. First of all, the short dust removal bag is less likely to be damaged than the long dust removal bag. At the same time, once it is damaged, scrapping a short dust removal bag has the advantage of saving cost and loss compared to scrapping a large area long dust removal bag; (6) The new bag filter can actually be made into a single-row structure. In this way, the dust collector can use the structure of the main equipment to make an integrated design. Then, the dust collector is equivalent to a part of the main equipment exhaust flue in function and structure; (7) If the new type of bag filter is designed according to independent equipment, its structure design can also be made into a combined structure, which has good adaptability to the changes and expansion of engineering projects. The new type of bag filter can increase or decrease the dust removal combined unit according to the change of the flue gas volume of the project. Especially for projects with foreseeable changes in the construction scale, it is not necessary to reserve the construction site of the dust collector in the later stage. Increase or decrease the number of layers of the dust removal unit to achieve economical and practical upgrades on the spot; (8) The internal structure of the new type of bag filter is more complicated than that of the traditional low-pressure long-bag filter, and the dust removal bags are more closely arranged, and the dust accumulation effect of the filter structure is relatively strong. Liquidity is better, which is its weakness. For this weakness, attention should be paid to the inclination of the wall in manufacturing, the moisture content of flue gas should be controlled during operation, and the temperature of dust should be maintained. In general, multi-layer bag filter has obvious advantages over traditional filter in terms of floor space, convenience of operation and maintenance, project construction and operation cost, and equipment variability. The traditional bag filter has only a single-layer layout, and the space height is often very small. In the layout environment of those tall boilers and other supporting equipment, it appears to be very small; however, its horizontal footprint is relatively large, especially when dealing with large air volumes. The arrangement structure of the dust collector and its air duct is more complicated. The development of a new type of bag filter will significantly improve this, and the same footprint can fully expand the processing capacity of the filter. At th...

     Bag head sewing → high speed machine sewing bag body → bag bottom sewing → inspection → packing → boxing     At present, our company adopts the Swedish imported ETON hanging system, which can deliver the products to the exact operation position of each process, enhance the production efficiency, and at the same time can accurately ensure the product process quality and reduce the product defective rate. In the field of filter media technology, we have stronger technical strength and the ability to research and develop new products than other competitors in the same industry, we have international advanced filter media testing and research equipment, currently we are not only able to evaluate the basic indicators in the needle punched felt conventional performance testing, but also to conduct comprehensive application analysis on the pore size distribution, appearance and shape of the filter fabric and the dynamic simulation of the filter cloth resistance and life span. We can make a comprehensive evaluation of each performance from the process to the use of the product.

Waste incineration will produce a large amount of harmful gases during combustion, among which nitrogen oxides are the main pollutants in the atmosphere. Among various nitrogen oxides removal (denitrification) technologies, selective catalytic reduction (SCR) technology is the most widely used. Its core It is a denitration catalyst. In the waste incineration power generation industry, due to the particularity of its flue gas, the existing common medium and high temperature denitration catalysts in China cannot be applied, and it has been monopolized by foreign products for a long time. In the waste incineration industry, the current nitrogen oxide emission standard is generally 200-250 mg/Nm3. The SNCR denitration process is generally used, and the reducing agent is directly injected into the furnace for selective non-catalytic reduction denitration, which can meet the emission requirements. With the increasingly stringent national environmental protection requirements, various local governments have also proposed more stringent exhaust emission standards. The current SNCR denitrification can no longer meet the requirements, and will cause the ammonia escape from the incinerator outlet to exceed the standard. At present, NOx in the exhaust gas of the waste incineration industry increases Standard transformation adopts SCR denitration technology. Comparison of incinerator tail gas denitrification processes The tail gas of the waste incinerator is reduced to 130~150℃ after dry/semi-dry deacidification (sulfur) and bag dust removal. At present, the activation temperature of medium and low temperature denitrification catalysts on the market is above 180℃, so it is necessary to supplement the exhaust gas. The denitrification can be carried out after the temperature rises. The general process route is to add a GGH heat exchanger, and then heat the heat source to increase the temperature of the flue gas to about 200 °C for denitrification. Therefore, the process is complicated, the investment in equipment engineering is large, and the operation cost of temperature rise is high. very high. The temperature activity range of the ultra-low temperature denitrification catalyst is 130~180℃, which can be directly denitrified under the condition of 150℃ exhaust gas temperature after bag dust removal, no need for supplementary combustion heat exchange to heat up, the process is simple and no heating cost, and basically has no impact on the original system , and the flue gas resistance is low, which can meet the ultra-low and ultra-clean emission requirements.