How to carry out the management of dust collector bag dust removal system

Precautions of bag filter duster dust collector, bag type dust collector, bag type dust collector; dust collector on the number of filter bags to choose the type of filter bag dust collector to determine the use of the filter bag according to the use of occasions, flue gas temperature and other conditions to determine the use of the filter bag filtration wind speed.　If the filtration wind speed of 1.2m/min, if the processing air volume of 26000m3 / h need to filter the filter area of the bag is: 26000/60/1.2 = 362m2. If you choose the specifications for the 130 * 2450 filter bag, the filter area of each filter bag is 1m2, probably need 362 filter bags.　If the use of gas box pulse bag collector, choose 6 chambers, a single room 64 bags of bag collector, that is, PPC64-6, so that the total number of bags: 384, the total filtration area: 384m2, so that the filtration air velocity 26000/60/384 = 1.13m/min, in line with the requirements of the selection is reasonable.　Electrostatic precipitator, electrostatic precipitator, electrostatic dust collector; Alkali recovery furnace electrostatic precipitator Dust filter media in Chinese and English. The conditions of use to be considered in selecting filter media are: 1. the characteristics of the dust gas treated by the dust collector 2. the characteristics of the dust 3. the dust removal method of the dust collector 2. the fiber material used to make the filter media. Fiber raw materials for the production of filter media in the past with natural fibers, commonly used cotton and wool. Later gradually changed to synthetic fibers and glass fibers, now there is almost no use of natural fibers. Currently used in the filter media of synthetic fibers are mainly the following: (1) polyester (PE-Polyester), trade names for polyester.　(2) Polypropylene (PP-Polypropylene), trade name for polypropylene.　(3) *** Polyacrylonitrile (PAN copolymer - Polyacrylonitrile copolymer), trade name for acrylic.　(4) Polyacrylonitrile homopolymer (PAN homopolymer--Polyacrylonitrile homopolymer), trade name Dolarit (5) Para-aromatic polyamide (m-AR-m-Aramide). The trade names are Nomex (Nomex), Conex , Metamax (Metas) (6) Polyimide (PI - Polyimide), the trade name is P84. (7) Polyphenylensulfide (PPS - Polyphenylensulfide), the trade names are Ryton (Ryton), Procon, Torcon. (8) Polytetrafluoroethylene (PTEE - Polytetrafluoroethylene), trade name Teflon (Teflon).　Electric Bag Composite Dust Collector, Electric Bag Dust Collector, Electric Bag Combined Dust Collector; Bag Dust Collector Used Industries Nowadays, the production of various industries emits a large amount of submicron dust which is more hazardous to human beings and the environment than other particle size dusts, but it is difficult to get rid of it. How to collect the chemical industry sub-micron dust has become a difficult problem in the aerosol and dust removal community, our dust removal product yield reached more than 99%, dust particles can reach a minimum radius of 0.5 μm, due to the high efficiency of the system operation and dust removal efficiency, the device is running stably, to create a greater economic and social benefits for the enterprise, and the exhaust emissions fully comply with the standards.　Chemical industry Polymer polymers: polypropylene, polyethylene, polyester compounds, polyacrylamide, ammonium cyanurate, ion exchange resin, activated carbon fiber, starch, cellulose derivatives, etc.　Fine chemicals: pharmaceuticals, pesticides, dyestuffs, pigments, fertilizers, explosives, detergents, catalysts, rubber and plastic additives, concrete additives, water treatment agents, oilfield chemicals.　Inorganic chemicals: acids, alkalis, salts, oxides, hydroxides, silica, whitening agents, fine ceramics.　Industrial kilns Cement vertical kilns, coal-fired glass furnaces, coking furnaces, compound fertilizer drying rotary kilns, municipal garbage drying rotary kilns, ceramics and a variety of building materials combustion furnace tail gas dedusting.　Cement kiln emission gas containing 1μm of dust accounted for 7.92%, 2μm accounted for 19.05%, 3μm accounted for 24.83%, the majority of cement kilns now use bag dust removal.　Industrial boiler Various coal-fired, oil-fired, gas-fired industrial boilers and blast furnace gas, pulverized coal furnace, fluidized bed boiler tail gas dedusting.　Building materials and mining industry Dedusting of ultrafine calcium carbonate, kaolin, bentonite, bauxite, magnesium hydroxide, ultrafine quartz, silica particles, graphite dust, metal dust, ore dust, coal dust and fly ash.　Metallurgical industry High-temperature flue gas dedusting of blast furnace, electric furnace, converter, sintering furnace and dedusting of loading and unloading of ore and coke in the iron and steel industry.　Difficulty of flue gas dedusting of blast furnace is high temperature of gas, if the bag dedusting must increase the suction volume to reduce the temperature, so that the handling capacity of the bag, energy consumption and investment increased by several times.　Ore coke dedusting ore unloading and sending it to the ground warehouse and high warehouse have more than one point of dust need to be dusted.　Sintering plant flue gas dedusting a steel company sintering header flue gas volume of 180,000m3 / h, temperature of 80 ℃, due to high gas humidity fogging serious, bag dust absorbed moisture paste bag, resulting in rising pressure drop, bag damage too quickly, high operating costs; Petroleum refining Catalytic cracking unit lifting tube reactor, regenerator inside and outside the dust collector.　Rapid separation device at the outlet of the lift tube reactor, primary and secondary internal cyclone dust collector in the settler, external cyclone dust collector, primary and secondary internal cyclone dust collector in the regenerator, and tertiary external cyclone dust collector of the multi-tube type. The separation efficiency of the above equipment is directly related to the catalyst consumption of the refining process and the service life of the flue gas turbine, and the size of its pressure drop also affects the system energy consumption and energy recovery.　Desanding of crude oil extraction fluid Most of the oilfields in China have entered the late stage of oil extraction, and the extraction fluid contains a large number of fines, and it has become a difficult problem for the separation of three times of oil extraction fluid to improve the separation efficiency of fines, and the national research project "Desanding of crude oil with high water content" adopts the new type of high-efficiency liquid-solid separator of rotary liquid to desand, and the handling capacity of a single equipment reaches 3000t/h, and the pressure drop of the equipment reaches The handling capacity of a single device has reached 3000t/h, and the pressure drop of the device is only 0.04MPa, which is equivalent to 40% of the pressure drop index of the more advanced foreign cyclone desanding, so that the energy consumption is greatly reduced and the desanding rate has reached more than 92%, and all the performance indexes are at the international leading level.　Other industries: thermal power, air flow transportation, foundry, metallurgical powder, mixing station, crafts processing, food processing and other industries in the tail gas dust collection and dust removal.　Pulse bag dust collector, boiler dust collector, low pressure pulse bag dust collector; explosion-proof bag dust collector Progress and development of China's dust removal technology China's dust removal technology has made great progress, the development of bag type dust removal technology is particularly rapid, mainly reflected in the following aspects.　(1) Higher efficiency and lower dust concentration is the general trend of the development of dust removal equipment. This is because: dust emission standards are more stringent; law enforcement efforts continue to increase, the means are increasingly advanced; for the control of fine particles have been attached importance to; the public's environmental awareness is rapidly increasing. In this context, the development of bag filter technology is more prominent. The most rapid growth of bag filter in developed countries, and has long occupied a dominant position in the market, although our country is lagging behind, this development trend has also been very obvious.　(2) China's bag filter dust concentration of less than 30mg / Nm3 ~ 50mg / Nm3 is not uncommon, there are many to reach 10mg / Nm3 or less, and even 1mg / Nm3 ~ 5mg / Nm3. mainly due to the following two aspects: First, the general application of the needle felt filter media, while the "surface filtration materials" and other new filter media also occupy a certain market. First, needle felt filter media is widely used, while "surface filter material" and other new filter media also occupy a certain market share. Surface filter material can further improve the dust removal efficiency, but also conducive to dust removal. It has three different types: the filter media will be covered with PTFE film; the filter media for coating; made of microfiber filter media surface layer.　Secondly, the interface technology of dust filter bag has made great progress. A new method is the bag hole of the flower plate and the filter bag bag mouth precision processing, and the bag mouth of the elastic element so that the bag is embedded in the bag hole, the two tolerances with good sealing, thus eliminating the dust collector with the filter media with the dust removal efficiency of the gap that prevailed in the past.　(3) for the bag type dust removal equipment resistance degree of concern, more than the dust removal efficiency of concern. This is because more and more people realize that the bag filter resistance of low or high, related to the success or failure of the bag filter project. Therefore, into the 1990s, to weak clearing for *** with the same characteristics of several kinds of reverse air bag filter from its application of the climax of the retreat, and pulse blowing type of strong clearing dust collector has gradually become the preferred equipment. The new generation of pulse bag filter technology represented by CD series long bag low pressure pulse bag filter completely overcomes the shortcomings of the traditional pulse, with strong dust-cleaning ability, high dust removal efficiency, long filter bag (up to 6 m or even 8 m), covers an area of less, less equipment resistance, the need for dust-cleaning air source pressure is low, less energy consumption, reliable, easy to change the bag, maintenance workload, etc., more and more widely used in most of the industrial sector, obtaining good results. Industrial sector, to obtain good results.　(4) pulse bag filter tends to be large-scale, the performance has reached the international level. Shanghai Iron and Steel Fifth 100 t steelmaking furnace supporting the long bag low-pressure pulse dust collector, handling air volume of 1 million m3 / h, dust concentration 8mg / Nm3 ~ 12mg / Nm3, equipment resistance below 1200 Pa, blowing pressure of ≤ 0.2 MPa, dust cleaning cycle of up to 60 min ~ 75 min. filter bag service life (without a breakage) reached 55 months, pulse valve diaphragm service life of three years. The service life of pulse valve diaphragm is three years.　The filtration area of the device is 11716 m2, after a large number of electric furnaces or other furnaces and kilns competing for the use of such equipment, one of the filtration area of 15,865 m2, handling air volume of 1.5 million m3 / h, used in Anshan Iron and Steel converter flue gas purification for more than two years.　(5) bag filter in the adaptation of high dust concentration to achieve a breakthrough, can directly deal with the concentration of 1400g/Nm3 of dust gas and discharge standards, the inlet dust concentration than the previous dozens of times higher. Therefore, many industrial sectors of the powder recycling system can abandon the original multi-stage dust collection process, and replace it with a dust collection. For example, based on the core technology of long-bag low-pressure pulse bag filter, strengthen its filtration, dust removal and safety and explosion-proof functions, the formation of high-concentration coal dust collection technology, has been successfully used in the coal milling system of the powder collection process, and in the Wuhan Iron and Steel, Anshan Iron and Steel and other enterprises to promote the application. Measured inlet coal dust concentration of 675 g/Nm3~879 g/Nm3, dust concentration of 0.59 mg/Nm3~12.2 mg/Nm3, equipment resistance is lower than 1,100 Pa, economic benefits, social benefits, environmental benefits are significant.　This technology has successfully promoted the optimization of cement mill system. In the past, the cement mill mainly relied on the cyclone dust collector to collect the product, and the bag filter to control the dust discharge. Now the baghouse is used to fulfill both product collection and dust control, resulting in a significant increase in throughput and a reduction in consumption.　For the past in the bag filter before adding the practice of pre-dusting, it is now generally believed that the bag filter is not only unhelpful, but also make it difficult to clear the dust. This is completely different from the previous concept.　(6) bag filter media development is rapid. Diversification of high-temperature filter media, in addition to the Metas, P-84, Leyden filter media has also been widely used, Bassford filter media has been commercialized; China's glass fiber needle felt manufacturing and application technology has matured, the variety of increased; through the calendaring of the filter media, oil-repellent, water-repellent, flame-retardant, hydrolysis-resistant, antistatic and other treatments to make the filter media to adapt to a variety of complex environments, the performance is better.　(7) a different way from the existing dust removal bag filter appeared in the wood processing industry. It is used from the filter bag bag mouth directly "dust" (not "suction") way, so that the bag cleaning. The cleaning airflow carries all the dust from the bag into a special cyclone dust collector, where the dust enters the recovery system and the exhaust air returns to the baghouse. It has a better cleaning effect than the "blowback" cleaning, higher filtering air speed, and relatively simple structure. It is used as an integral part of a pneumatic conveying system for wood processing materials, with an inlet dust concentration of about 230 g/Nm3. This type of dust collector has not been reported for use in other industries.　(8) bag filter application technology has also made great progress. In the face of the ever-changing production processes and dust properties, in the choice of equipment type, parameters, a variety of unfavorable factors (high temperature, high humidity, high dust concentration, fine dust, hygroscopic dust, corrosion, flammable, large fluctuations in working conditions, etc.) to prevent, reasonable operation and maintenance system set up, etc., are more reliable, perfect, which is an important reason for the application of the field of expanding.　It is worth mentioning that, China's coal-fired power plant boiler flue gas dust removal for a long time for the domination of the electric precipitator field has begun to use bag filter. Hohhot Power Plant two 200,000kW units to take the lead in realizing this progress, one of which has been put into operation, the other is under construction. The application of baghouses for industrial boilers was successfully implemented a few years ago. A number of coal-fired power plants and industrial boilers are now adopting or preparing to adopt this dust removal technology.　Another new area of application for baghouse dust collectors is the purification of flue gas from waste incineration. Garbage incineration process dust, flue gas deacidification and adsorption of dioxin and other harmful gases formed by the formation of solid particles are collected by the baghouse dust collector, the requirements of the export concentration of dust is less than 5 mg / Nm3 ~ 10 mg / Nm3. (9) dust removal equipment and diagnosis of disease renewal, transformation technology is an important element of the progress of dust collection technology, which is most active in the baghouse dust collector. First of all, the old, old dust removal equipment research, testing, to determine where the disease is, to develop a cure program; to take to retain the peripheral structure, replacement of core components, rational organization of the airflow, supporting computer control measures, so that the disease equipment to return to normal, the old equipment renewal and replacement. A large number of different types of baghouse dust collectors, as well as steelmaking, cement enterprises, several sets of electric precipitator has been transformed into a long bag of low-pressure pulse baghouse dust collector, to achieve advanced technical and economic indicators. The transformation of the electric precipitator itself is to improve the dust removal efficiency as the goal.　(10) bag filter dust removal equipment tends to deepen the study of the mechanism of dust removal. Prove that the decisive factor affecting the filter bag cleaning is not the size of the air volume and duration of the length of time, mainly lies in the cleaning of the pressure peak in the bag, the pressure rise rate and the bag wall can get how much reverse acceleration; test several kinds of bagged dust collector cleaning strength. These research results to guide the development of baghouse dust removal equipment, selection and testing, has had a positive effect.　(11) dust collector automatic control in 1983 began to use microcomputer technology. At present, the baghouse and electric dust collector widely used programmable controller (PLC), industrial computer (IPC) is also expanding the application. In addition to clearing program control (fixed differential pressure or timing optional), the bag dust automatic control system functions also include: temperature, differential pressure, pressure, flow and other parameters of monitoring and control; blowing device, stopping the wind valve, unloader and other components of the working condition monitoring; clearing parameter display; fault alarm.　(12) electric precipitator in the board, line form and configuration, to prevent secondary dust, flue gas conditioning, high (or low) than the resistance of the dust treatment has made some progress, combined with the development of automated technology, so that the dust removal efficiency has been improved, many of the electrostatic precipitator dust concentration than the national standard is lower. Compared with it, in the equipment lightweighting efforts, the results are more significant, a substantial reduction in steel consumption, coupled with steel price reduction, its cost has been able to compete with some bag filter.　(13) the emergence of "high concentration of electrostatic precipitator", used to solve the problem of coal-fired flue gas desulfurization in power plants after the concentration of dust increased exponentially. In the dust concentration of 800 g/Nm3, the dust concentration is less than 200 mg/Nm3. (14) The application of wet dust collector is greatly reduced, in addition to high-temperature flue gas, small-scale power plant boilers and other occasions, almost disappeared from the field of dust removal. In the last decade, spray tower, impact type wet dust collector and regained attention, was developed as an integrated dust removal and desulfurization equipment for small boilers, can weaken the coal-fired flue gas pollution, but far from being able to achieve universal emission standards.　(15) cyclone, multi-tube dust collector in improving the dust removal efficiency without qualitative breakthroughs, it is still difficult to be sure to meet the emission standards. In addition to a few occasions, more used as a pre-dusting.　Dust collector, sintered plate dust collector, plastic burnt plate dust collector, cartridge dust collector Bag filter selection calculation There are many kinds of bag filter, so its selection calculation is particularly important, improper selection, such as equipment is too large, will cause unnecessary flow of fees; equipment selection of small will affect the production, it is difficult to meet the requirements of environmental protection.　Selection and calculation methods are many, in general, before the calculation should know the basic process parameters of the flue gas, such as the flow rate of dusty gases, nature, concentration, and dust dispersion, infiltration, viscosity and so on. After knowing these parameters, by calculating the filter air velocity, filter area, filter material and equipment resistance, and then select the type of equipment type.　1, the calculation of the amount of gas treatment Calculation of baghouse dust collector gas treatment, first of all, the amount of gas required under the working conditions, that is, the actual amount of gas through the baghouse dust collector, and also take into account the dust collector's own air leakage. These data, should be based on the actual operating experience of existing factories or test data to determine, if the lack of necessary data, according to the production process of the amount of gas produced, and then increase the amount of air mixed into the air collection hood (about 20% to 40%) to calculate.　It should be noted that, if the production process is the amount of gas generated by the working state of the amount of gas, selection and comparison needs to be converted to the standard state of the amount of gas.　2, the selection of filtering wind speed The size of the filtering wind speed depends on the nature of the dusty gas, the category of fabrics and the nature of the dust, and is generally selected according to the data recommended by the sample of the dust collector and the practical experience of the user. The filtration air velocity of most of the reverse air bag filters is between 0.6 and 13/m, the filtration air velocity of pulse bag filters is around 1.2-2m/s, and the filtration air velocity of fiberglass bag filters is about 0.5-0.8m/s. The following table lists the filtration air velocities that can be used to select the filtration air velocity of the bag filter. The following table lists the filtration wind speed for selection reference.　Dust type dust removal method self-shedding or manual vibration mechanical vibration backblowing pulse blowing carbon black, silicon oxide (silica), aluminum, zinc sublimation and other in the gas due to condensation and chemical reaction and the formation of the gas solution, activated carbon, by the cement kiln discharge of cement. 0.25 ~ 0.40.3 ~ 0.50.33 ~ 0.600.8 ~ 1.2 Iron and ferroalloys sublimation, casting dust, Alumina, Cement discharged from cement mills, Carbonizer sublimates, Lime, Corundum, Plastics, Iron oxides, Coke dust, Coal dust 0.28～0.450.4～0.650.45～1.01.0～2.0 Talc, Coal, Sandblast cleanup dust, Fly ash, Dust from ceramic production, Carbon black (secondary process), Pigments, Kaolin, Limestone, Mineral dust, Bauxite, Cement (from Cooler) 0.30-500.50-1.00.6-1.21.5-3.0 3. Determination of filtration area (1) Total filtration area According to the total gas volume through the dust collector and the pre-determined filtration speed, the total filtration area is calculated according to the following formula: After finding out the total filtration area, the overall size and dimensions of the bag filter can be determined.　(2) the area of a single filter bag The area of a single round filter bag In the process of filter bag processing, because the filter bag to be fixed in the flower plate or short tube, and in some cases, also hanged up and fixed in the bag cap, so the ends of the filter bag need to be double sewing or even multi-layer sewing: double sewing of this part of the resistance has increased due to the role of filtration, and at the same time, some of the middle of the filter bag to be fixed in the middle of the ring, the part of the filter has no role.　In the large and medium-sized backblowing dust collector, the filter bag is 10m long, 0.292m in diameter, its nominal filtration area is 0.0292 × 10 = 925m; if you deduct the area of no filtration effect of 0.75m, the net filtration area of 8.25-0.75 = 7.5m. It can be seen that the bag is not useful for filtering the filtration area of the filter bag accounted for 5% to 10% of the area of the filter bag, so in the large and medium-sized dust collector Specification should indicate the size of the net filtration area. But in the existing dust collector samples, most of the filter area refers to the nominal filter area, in the design and selection should be noted.