Dust collector dust bag can be called the heart of bag filter, generally called filter dust bag, dust filter bag, dust bag, dust bag, dust bag, dust bag, etc. The dust bag is a key part of the operation of the bag filter, and the cylindrical filter bag is usually hung vertically in the dust collector.     Material of cloth bag   The material of the dust bag is classified according to the temperature of the working condition. There are high-temperature cloth bags, medium-temperature cloth bags and normal-temperature cloth bags; high-temperature cloth bags are made of P84 needle felt, flumesi, Mitas, fiberglass needle felt, etc.; medium temperature Bag materials include PPS needled felt, PTFE needled felt, Fangster needled felt, acrylic needled felt, etc.; normal temperature cloth bag materials include polyester needled felt, coated polyester needled felt, water and oil resistant needled felt, repellent Water and oil-proof electrostatic needle felt, etc.; filter materials of various materials are selected according to the working conditions.   Design and production standards for dust collection bags:   The filter bag is made in strict accordance with the GB/T6719-2009 national standard to ensure the qualified rate of the product.   Bag classification:   Processing method: According to the processing method, it is mainly divided into three types: woven filter material dust bag, non-woven filter material dust bag and composite filter material dust bag.   1. Woven filter material dust collector filter bag: a filter material woven with warp yarns and weft yarns arranged perpendicularly to each other according to a certain organizational law, represented by the letter W;   2. Non-woven filter material dust collecting filter bag: without ordinary spinning and weaving process, fiber is directly formed into a net or yarn into a layer, interlaced, bonded, needle punched, melt blown or spun into a sheet shape The filter material is represented by a compound letter consisting of the letter NW and the code of the specific processing method;   3. Composite filter material dust-removing cloth bag: a dust-removing cloth bag filter material made by two or more methods or a combination of two or more materials, denoted by the letter C.   Fabric weave: According to the fabric weave, it is mainly divided into three types: plain weave filter material dust bag, twill weave filter material and forged weave filter material.   1. Plain weave: This is the simplest form of weaving. Each warp and each weft alternate up and down, but the plain weave has the disadvantages of being difficult to clean and easy to block. Therefore, this kind of weaving has been rarely used as a dust filter material. ;   2. Twill weave: It is formed by interweaving two upper and four lower warp yarns with the weft at the same time. The interweaving point of warp and weft gradually moves to the left or right; the twill weave is divide...

When the moisture content in the air is constant and the temperature of the humid air is lower than the dew point temperature, moisture will be precipitated in the supersaturated air, that is, condensation will occur in the dust bag; when the air temperature is higher than the dew point, no moisture will be precipitated. There will be no condensation. In addition, if the flue gas contains SO2, the more SO2 content, the higher the dew point of the flue gas.     Solution to the condensation phenomenon ofjetpulse bag filter:   1. Reduce the air leakage of the dust collector   (1) During the production and installation process of the dust collector, the welding standard of JC/T532 must be strictly implemented to prevent the phenomenon of less welding and missing welding of the dust collector.   (2) The discharge port of the dust collector should adopt an air-locking device with good sealing performance. At present, pneumatic or electric air-locking valves are mainly used. When necessary, a dual-stage air lock device can be used. The air leakage rate of a pulse bag filter should be controlled within the range of ≤3%.   2. The stable flue gas temperature is within a small range   When the temperature of the flue gas to be processed is high, measures such as lowering the operating temperature and releasing cold air must be taken immediately; when the temperature of the flue gas is low, measures such as raising the operating temperature must be taken immediately. The flue gas temperature can be stabilized within the specified range, to ensure the normal and stable operation of the dust collector, and reduce condensation.   3. Reduce the temperature difference between the pulse blowing gas and the flue gas inside the dust collector and dehumidification treatment   At present, the commonly used gas supply routes for compressed gas in China are mainly: compressed air-gas storage tank-gas source triple-air bag-pulse valve. This air supply method has the advantages of low investment and simple equipment. However, when the outside air temperature is too low, the compressed gas is not adequately treated and condensation is easy to occur.   When the outside air temperature is too low and the air compressor station is far away, the air supply route can be: compressed air-air storage tank-air source triple-air dryer-air heater-air bag (air Insulation material is laid in the package)-pulse valve. This air supply method is fully and thoroughly dehumidified, and the temperature difference between the pulsed gas and the flue gas inside the dust collector is small, and condensation is not easy to occur. When the air compressor station is not far away, and the air filter in the air source triplet can meet the dehumidification needs, just pay attention to the air filter close to the air bag, so the air dryer can be omitted. When the temperature is too low, the air pipeline, air bag and pulse valve must be insulated to pre...

Micro-electromechanical system (MEMS) refers to a micro-device or system that can be manufactured in batches and integrates micro-structures, micro-sensors, micro-actuators, and signal processing and control circuits. Firstly, the interdigital electrode substrate prepared by MEMS technology has micro-nano-scale electrode spacing, which can greatly improve the signal-to-noise ratio, reduce the detection limit, and facilitate rapid response in seconds; secondly, the micro-electrode substrate based on MEMS technology The heater can achieve a lower heating power consumption in the milliwatt level and a temperature rise-fall rate in the millisecond level, which is conducive to the application of the sensor in the actual field. Based on MEMS technology, the size of the sensor can be greatly reduced, which is conducive to the sensor array architecture and the network monitoring of the sensor. The MEMS substrate production process is currently relatively mature, and the difference between the sensor is mostly the integration method of the sensitive material and the substrate, mainly including atomic layer deposition method, electroplating method, thermal oxidation method, wet etching method, magnetron sputtering method and screen printing method Wait. (1) Atomic layer deposition method Atomic layer deposition (ALD) is a method in which a gas-phase precursor is repeatedly passed through the reactor and a deposited film is formed on the substrate. The precursor introduced each time will be deposited on the surface of the substrate and a thin film will be formed along with the surface reaction. After repeated cleaning and deposition, a thin film of the target thickness will be produced. Most of the metal oxide films and core-shell structures grown by atomic layer deposition can be used for sensing applications. By adopting this method, as long as there is a gap through which the film-forming material can pass, the film thickness can be controlled at the nanometer level. A uniform film is formed during processing. (2) Electroplating method Electroplating is the process of plating another layer of other metals or alloys on the surface of some metals using the principle of electrolysis. In the electroplating process, the plating metal is used as the anode and the target device is used as the cathode. The cations of the plating metal will be reduced on the surface of the workpiece to be plated to form a plating layer. The main advantage of electroplating technology is that it is an extremely cheap film preparation technology. In addition, electroplating technology can be used to prepare alloys, centimeter-level thick films and complex patterns, and electroplated films have good stress characteristics. Electroplating technology is limited by its own deposition principle, and generally requires a thin metal layer on the substrate as a seed (the so-called seed), so this limits the types of substrates to a certain extent. (3) Thermal oxidation method The main proce...

The sub-chamber reverse blowing dust bag dust collector is usually divided into several chambers, each of which has a separate ash hopper, dust-containing gas inlet pipe, clean gas outlet pipe, and reverse suction pipe, which are connected to the main intake pipe and the reverse suction pipe respectively. The suction manifold is connected. When one room is blown back to clean the ash, the other rooms are in normal filtration operation. The reverse blower enters the cleaning chamber through the reverse blower switching valve 6, and the reverse blower blows to the filter bag to blow the filter bag in the opposite direction to the normal filtering direction, and the dust on the inner surface of the filter bag is blown into the ash hopper.

Comparison of low-pressure rotary pulse back-blowing bag dust removal technology and line-injection bag dust removal technology Features Rotating pulse cleaning Line jet pulse cleaning illustrate Blowing pressure small big Rotary pulse cleaning: 0.065MPa~0.085MPa; line jet pulse cleaning: 0.2MPa~0.3MPa, the compressed air drawn from the air compressor needs to be decompressed before it can be used. Land area small big Rotary pulse cleaning: 0.065MPa~0.085MPa; line jet pulse cleaning: 0.2MPa~0.3MPa, the compressed air drawn from the air compressor needs to be decompressed before it can be used. Filter bag length Up to 8 meters Less than 8 meters Due to the rapid decay of the vibration acceleration of direct-injection dust removal, the bottom of the bag cannot be effectively removed when the filter bag is long. The filter bag of the direct-injection bag filter is usually 6 meters. Ash cleaning system simple complex Rotary pulse dust cleaning: Each bag room only needs one set of rotating dust cleaning system, equipped with a diaphragm valve, a rotating motor and a gas storage tank, with simple structure and convenient maintenance; Line jet pulse cleaning: each bag chamber has a main air collecting pipe, and each row of injection pipes is connected to the main air collecting pipe through a diaphragm valve. This structure requires a large number of diaphragm valves. Due to the high injection pressure, nozzles and bags are required. Strictly align the mouth to avoid premature destruction of the filter bag caused by misalignment. Number of diaphragm valves rare Very much Rotary pulse dust cleaning cloth bag dust collector is equipped with only one diaphragm valve in a bag chamber, and a dust collector generally has 4 to 8 bag chambers, and only 4 to 8 10" or 12" diaphragm valves are required; while the direct injection cloth bag The dust collector needs to be equipped with a 3”diaphragm valve on each row of cloth bags. A dust collector requires a large number of diaphragm valves, which increases the number of points of failure. Replace filter bag, bag convenient complex Rotary pulse cleaning: direct replacement, the filter bag and bag cage located under the rotating arm only need to gently push the rotating arm away; Line jet pulse dust cleaning: when replacing filter bags and bag cages, the blowing tube needs to be disassembled, and reset after replacement. Heavy workload. Filter bag shape Oblate Round shape When cleaning dust, the oblate filter bag has a large deformation on the long side, and the dust removal effect is good; while the circular filter bag deforms uniformly along the entire circumference due to the high dust removal pressure. Compared with the oblate filter bag, the cloth bag The life span has been shortened. Spare plate hole Can be reserved Can not be reserved The rotary pulse dust cleaning cloth bag dust collector can reserve cloth bag holes, which can be used when needed, with great flexibility. Gas source for cleaning dus...

The bag filter is composed of a box body, a filter bag (including a frame), a dust removal device, an ash bucket and a dust removal device. As shown in the figure, there are many filter bags suspended in the box. After the dust-containing gas enters the dust collector, the dust is trapped on the outer surface of the filter bag through the filter bags installed side by side, and the purified gas is discharged from the outlet of the dust collector. As dust accumulates on the filter bag, the resistance of dust-laden gas through the filter bag will increase accordingly. When the resistance reaches a certain value, the dust removal device is used to discharge the dust from the dust collector to achieve dust removal.