What is the advantage of high frequency power supply over bag dust removal?

Hebi Huatong will explain the advantages and disadvantages of high-frequency power supply for you in detail, like to like it.

The advantages of high-frequency electrostatic precipitator are that it is small in size and light in weight, only a fraction of the conventional power frequency power supply, occupies a small space, and is easy to install.

Second, it adopts three-phase power balance input, which has no pollution to the power grid and no phase loss loss, which belongs to Luther power supply.

Third, the power and efficiency factor is high, the efficiency is usually 93%, and the power factor is usually 93%, which is more than 20% more energy-saving than the power frequency.

The fourth high-frequency power supply is installed on the top of the electrostatic precipitator, the equipment is integrated, the amount of cable is significantly reduced, and at the same time, it does not occupy the space of the control room, which can save civil construction costs.

As a dust collector used in a wide range of markets now, bag dust removal also has certain advantages, otherwise it will not have a high market acceptance.

First of all, the bag dust removal efficiency is very high, generally up to 99%, which can capture fine dust particles with a particle size of heavy rain microns, and can meet strict environmental protection requirements.

Second, the performance is stable. The changes in the working conditions such as air volume, gas dust content, and temperature have little impact on the dust removal effect of the bag filter.

Third, the dust is easy to handle. The bag filter is a dry purification equipment that does not require water, so there is no sewage treatment or mud treatment problem, and the collected dust is easy to use.

Fourth, it is flexible to use. The air volume can be from hundreds of cubic meters per hour to hundreds of thousands of cubic meters per hour, and can be used as a small unit directly located indoors and nearby, or it can be made into a large dust removal room.

Fifth, the structure is relatively simple, the operation is relatively stable, the initial investment is less, and the maintenance is convenient.

However, even if there are so many advantages of bag dust removal, in the market, the policy is still inclined to high-frequency power supply, rather than encouraging and supporting bag dust removal, because bag dust removal has more prominent shortcomings and lower efficiency than high-frequency power dust collectors.

What are the disadvantages of bag dusting?

First of all, there is a certain limit to the temperature that the bag dust can withstand. Cotton and wool filter media can withstand temperatures of 80-95 degrees, synthetic fiber filter media can withstand temperatures of 200-260 degrees, and glass fiber filter media can withstand temperatures of 280 degrees. When purifying flue gases with higher temperatures, measures must be taken to reduce the temperature of the flue gases.

Second, some flue gas contains more moisture, or all the dust has strong hygroscopicity, which often leads to the adhesion of the filter bag and the blockage of the filter material. In order to ensure the normal operation of the baghouse, necessary insulation measures must be taken to ensure that the moisture in the gas does not condense.

Thirdly, some types of baghouse workers have poor working conditions and need to enter the box when inspecting and replacing the filter bags.

It is named according to the pressure of the compressed air of the bag filter, in fact, the model and naming of each dust collector are related to the characteristics of the dust collector itself and some use characteristics.

The main differences between bag dust removal and electrostatic precipitator are:

1. The bag filter can filter any dust, and the filtration efficiency is not affected by the dust attributes. When the specific resistance of dust exceeds 10 10 ·cm (10 to the 10th power of 10), the performance of the electrostatic precipitator will decrease with the increase of specific resistance. It is mainly due to the fact that the specific resistance is too high, and the reverse corona phenomenon is easy to form, which reduces the efficiency of electrostatic precipitator.

2. Electrostatic precipitation: the dust-containing gas is electrocentrically separated when it passes through the high-voltage electrostatic field, and the dust particles are combined with negative ions to carry negative electricity, and tend to be discharged on the surface of the anode and deposited; A dust collection method that ionizes a gas using an electrostatic field so that dust particles are electrically adsorbed onto the electrode. And what about the bag dusting:

The dusty gas enters the ash hopper from the air inlet or enters the filter bag chamber through the open flange, and the dusty gas is filtered through the filter bag into the clean gas chamber, and then through the exhaust port of the clean air chamber, and finally discharged by the fan.

The advantages of the bag dust collector: high dust removal efficiency, generally more than 99%, simple structure, easy operation, under the same dust removal efficiency, lower than the electrostatic precipitator investment, insensitive to the characteristics of dust, large gas volume. The disadvantages are:

When it is suitable for working in a high temperature state, the dust is easy to stick to the bag and plug the bag, resulting in the difficulty of cleaning the bag, the resistance increases, and the premature failure damage, which cannot be used in the case of condensation.

The advantages of electrostatic precipitator are: it is suitable for particulate control, the efficiency can reach 98% to 99%, it can handle the gas at high temperature, it is suitable for large-scale projects, and the larger the air volume, the more obvious its effect. In the electrostatic precipitator, the energy separated from the air flow is not supplied to the air flow, but directly to the dust particles, so the resistance of the electrostatic precipitator is lower than that of other high-efficiency dust collectors.

The disadvantages are: huge equipment, large floor area, more steel consumption, large one-time investment, complex structure, high precision of manufacturing and installation, and certain requirements for the specific resistance of dust.

Baghouses have been widely used in various industrial parts for a long time to capture non-cohesive, non-fibrous industrial dust and volatiles, capturing dust particles up to microns. However, when it is used to treat gases containing water vapor, condensation should be avoided. Bag dust removal has a high purification efficiency, that is, the efficiency of capturing fine dust can reach more than 99, and its efficiency ratio is high.

The main structure of the electrostatic precipitator is a steel structure, all welded by section steel (as shown in Figure 10), and the outer surface is covered with skin (thin steel plate) and insulation materials, for the convenience of design, manufacture and installation. Its working principle is that when the flue gas passes through the flue in front of the main structure of the electrostatic precipitator, the smoke and dust are positively charged, and then the flue gas enters the electrostatic precipitator channel with multi-layer cathode plates.

The newly installed cloth bag is broken in less than 3 months, regardless of the dust bag is ***, the quality is poor, it can not take 3 months, it is not broken when it is spontaneously combusted and aged, and it is used normally for more than a year, there are many production enterprises that use biomass fuel as boiler fuel, there are bamboo scraps, wood scraps, corn and rice husk orange stalks, etc., because such biomass is burned in the flue gas dust collection, contains a large number of recombustible wood carbon dust particles, and the carbon content of the bag dust collector is too high, Wood toner accumulates heat, spontaneously combusts, burns off the bag, or it is possible that Mars enters the bag dust collector to cause smoldering, and the area of smoldering increases, resulting in the dust in the dust collector catching fire, burning the bag, and causing the bag of the manufacturer to burn out.

Reasons for Mars to burn bags:

1. The boiler is a 6t heating steam boiler, and the combustion materials used are bamboo scraps (bamboo powder, bamboo chips) and other materials.

2. Due to this working condition, there is a lot of spark dust in the dust removal pipe, and due to the original smoke of the boiler, the oxygen content of the boiler flue gas is high, which is about 10% normally (most of the sparks under the 8% of the emotions are extinguished). In fact, many boilers do not meet this parameter, resulting in high oxygen content, so that combustibles have an aerobic environment.

3. Coupled with the non-sealing of the system and the compressed air for bag cleaning, the oxygen content will be higher so that the sparks can burn freely in the pipeline.

4. Not only can the sparks burn freely, but the dust in the dust removal system is not completely burned bamboo charcoal powder. The characteristic of bamboo charcoal powder is that it is a flammable material that reaches the ignition point at a temperature of 320 degrees. The bamboo charcoal powder accumulated on the surface of the cloth bag has the function of heat absorption, so that it is full of heat energy, and spontaneously burns to burn the cloth bag.

5. The whole process of Mars burning bag: Mars and bamboo charcoal powder are adsorbed on the surface of the bag at the same time, part of the spark is absorbed, and part of it causes the surrounding bamboo charcoal powder to smoke, and the area gradually becomes larger, and the oxygen content reaches 17%-20% when the furnace is stopped and opened.

The working mechanism of the bag filter is that the dusty flue gas passes through the filter material, and the dust particles are filtered down, and the filter material mainly relies on inertial collision to capture coarse-grained dust, and the fine-grained dust is mainly collected by diffusion and screening. The dust layer of the filter material also has a certain filtering effect.

The effectiveness of a bag filter is related to a variety of factors, but it mainly depends on the filter material. The filter material of the bag filter is a cloth or felt woven from synthetic fibers, natural fibers or glass fibers. The cloth or felt is sewn into a cylinder or flat filter bag as needed.

According to the nature of the flue gas, the filter media suitable for the application conditions is selected. Generally, when the flue gas temperature is lower than 120 and the filter material is required to have acid resistance and durability, polyester flannel cloth and polyester needle felt are often selected; When dealing with high-temperature flue gas (<250), graphitized glass cloth is mainly used; In some special cases, carbon fiber filter media is selected.

There are two kinds of electrodes in the electrostatic precipitator (fog), the positive electrode (usually grounded) is generally made into a tubular or plate shape, and the negative electrode is a pair of wires or parallel wires. When tens of thousands of volts of high-voltage direct current are applied to the two electrodes, an inhomogeneous electric field is generated between the electrodes. In the area of a strong electric field near the wire, the gas emits a faint light due to ionization, which is called the corona zone; At a slight distance from the wire, the electric field strength is weakened and no gas ionization occurs, so that there is no arcing between the poles, thus saving electrical energy.

The positive ions produced by ionization move towards the negative wire, causing a small part of the dust mist to carry a positive charge along the way, and also move towards the negative wire. The negative ions produced by ionization are attracted by the positive electrode, so that the space outside the corona zone is filled with negative ions, and in the process of moving to the positive electrode, most of the dust and fog are charged and gathered to the positive electrode, so the positive electrode is also called the precipitating electrode.

According to the shape of the precipitating electrode, electrostatic precipitators can be divided into two types: Tubular electrostatic precipitators. It uses metal tubes and wires as electrodes, which are generally used to remove acid mist or other aerosols.

Plate electrostatic precipitator (fog) (see figure). It uses a flat plate (or wire mesh) and a parallel wire set as electrodes, which is compact in structure and has a large processing capacity, and is currently the most widely used form. Dust particles deposited at the sedimentation electrode can be removed periodically by mechanical methods such as hammering, or washed away with water. Electrostatic precipitator.

The electrostatic precipitator and bag filter produced by Fengbang Energy Conservation and Environmental Protection are both high-efficiency dust collectors, and the two types of equipment have their own advantages, and they have obtained good practical application results under the working conditions suitable for their own characteristics. Electrostatic precipitator with its resistance.

The most superficial difference is that the mechanism of treatment is different.

It is very extensive, and the flue gas dust removal of thermal power plants is used, mainly using high-temperature materials, and there are also those that use electricity and loans to combine dust removal, but negative corona electrostatic dust removal is easy to produce ozone, which has a chemical reaction on the filter material of the bag filter, which is not good for the bag filter.

Adopting mine is the same as adopting the upstairs.

High-temperature bag filter is a kind of dust removal device, the general dust control project is the use of bag filter, today we are talking about a kind of bag filter, about the high-temperature bag filter, but the high-temperature resistant material is not the same, ** is not the same, according to different working conditions to choose different bag materials. There are a wide range of high-temperature resistant bag filters, what are them?