How to remove boiler smoke from dust 10, how to remove boiler smoke from dust

It is recommended to use a bag filter, the working mechanism 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.

It is important to control the speed at which the flue gas passes through the filter media (called the filtration rate) during the operation of the baghouse. Generally, the filtration speed is 0 5-2m min, and the efficiency of particles greater than 0 1 m can reach more than 99, and the equipment resistance loss is about 980-i470pa.

You can remove it with water, and add a water hose to spray it on the flue. It should work, we have 35t boilers there using this, and 75t boiler desulfurization is also based on this principle, that is, the spray is different.

At present, the electrostatic precipitator and bag filter with the most widely used and good effect are used.

In the early stage of the factory, the effect of the two dust removal methods is better, but after a long running time, the bag dust removal effect is better than that of electrostatic precipitator, with the implementation of ultra-low emissions, the bag dust removal method is recommended.

1. Bag dust removal: This method has a good dust removal effect, but the resistance is too great, and the bag is easy to fail because it is blocked by ash, which is more suitable for small boilers.

2. Hydraulic dust removal: also called venturi dust collector, this method has good dust removal effect and is suitable for both large and small boilers. The disadvantage is that it needs to consume a large amount of water, which is not suitable for water-scarce areas, and is not conducive to the comprehensive utilization of fly ash.

3. Electrical dust removal is an electrostatic precipitator, and the dust removal effect of this method is very good, the resistance is also small, and the power consumption of dust removal is low. The disadvantage is that the floor space is too large, the investment is also large, and it is mainly used in large boilers.

Water mist dedusting: The coal dust in the coal yard is lowered to the ground by using water mist, and then the dust removal is completed through the deposition and cleaning of the ground. This method requires spraying equipment and a water source that can reduce the amount of coal dust raised.

Air dusting: Use air dust removal equipment, such as dust collectors, filters, electrostatic precipitators, etc., to collect and filter coal dust and reduce the amount of dust generated by coal dust.

Mulching materials: Covering stable materials, such as gravel or cement, in the coal yard can reduce the amount of dust raised by coal dust.

Reduced vibration: Reducing the vibration and travel speed of the equipment can reduce the amount of dust raised by coal dust.

Management system: Formulate a scientific coal yard management system, such as stipulating the time for vehicles to enter and exit and limit the stacking height, etc., which can reduce the amount of coal dust.

The following methods can be used for dust removal in coal yards:

Spray dust removal: By spraying water mist on the coal pile, the dust and water droplets are combined into larger particles and fall to the ground or be blown away by the wind, so as to achieve the dust removal effect. This method is beneficial to reduce the concentration of dust in the air in the coal yard.

Closed storage: reduce the area and height of coal stacked in the open air, and use closed warehouses for storage, which can effectively prevent coal dust from flying.

Vacuum collection device: Set up a vacuum collection device in the coal yard to absorb the dust in the coal yard.

Light curtain dust removal: The dust in the coal yard is separated by the special optical principle of the light curtain to achieve the dust removal effect.

Management of dust prevention and control roads, equipment and operators: strengthen the management of vehicles, machinery and other equipment entering and leaving the coal yard, regularly clean and maintain, and train and manage operators to reduce dust phenomenon.

It is necessary to select the appropriate dust removal method according to the specific situation, and comprehensively consider the technical, economic and environmental protection factors to achieve effective dust removal in the coal yard.

The open-pit coal yard will produce a large amount of coal dust during operation, which seriously affects the ambient air quality. Generally speaking, the use of dust suppression fog cannon machine spray dust reduction can reduce the coal dust content in the surrounding air.

The dust fog cannon machine uses the principle of high pressure to spray water out in the form of fine water mist, and the water mist floating in the air adheres to the dust particles, and reaches a certain weight to fall to the ground to achieve the purpose of controlling the dust.

Summer spray can also lubricate the air, reduce the temperature and improve the environment.

Hello. Whether the dust is handled indoors or outdoors. Coal yards are all used to reduce dust

Dust collectors can also be used to dispose of dust.

Our company is now the first company in South Korea electrostatic bag dust removal technology, the treatment results are very ideal, the emission is less than 10mg, the desulfurization effect is also quite good, is a Sino-South Korean environmental cooperation project.

There are too many ways to dust the boiler, and your question is too general. Generally speaking, it is for boilers that burn coal or other special fuels. Now the commonly used dust collectors include cyclone dust collectors, bag dust collectors, water film dust collectors and so on.

Dust collector, choose according to the boiler model, there are ordinary and good.

Summary. Hello, because there is air leakage in the boiler dust collector, a large amount of cold air from the outside is sucked into the boiler dust collector, which makes the local air temperature of the boiler dust collector drop sharply, and the water in the air is analyzed, resulting in the condensation of the boiler dust collector cloth bag. There are many reasons for the air leakage of the bag boiler dust collector, such as the leakage of the boiler dust collector shell in the production and installation process, the air leakage caused by the poor sealing of the discharge device, the air leakage caused by the lack of welding in the installation process of the non-standard pipeline, and the air leakage caused by the poor sealing of the flange connection between the boiler dust collector and the non-standard pipeline, etc.

Hello, dear, because there is air leakage in the boiler dust collector, a large amount of cold air from the outside of Li Ji is sucked into the boiler dust collector, which makes the local air temperature of the boiler dust collector drop sharply, and the water in the air is analyzed, resulting in the condensation of the boiler dust collector cloth bag. There are many reasons for the air leakage of the bag boiler dust collector, such as the leakage of the boiler dust collector shell in the production and installation process, the air leakage caused by the poor sealing of the discharge device, the air leakage caused by the lack of welding in the installation process of the non-standard pipeline, and the air leakage caused by the poor sealing of the flange connection between the boiler dust collector and the non-standard pipeline, etc.

The working principle of the boiler dust collector: the diversion pipe enters the cooling device and then enters the bag dust collector after treatment, and the large particle dust falls directly into the ash hopper after separation under the guidance of the ash hopper diversion system, and the rest of the dust enters the filter room of each unit, and the flow is drained through the flue gas distribution device, and the blind sail filter room enters the blind sail filter room in all aspects, and the air flow enters the filter area of the middle box, and the filtered clean gas penetrates the filter bag, and is discharged through the upper box, poppet valve, and exhaust pipe. With the progress of filtration, when the dust on the surface of the filter bag reaches a certain amount, the ash cleaning control device closes the poppet valve according to the set procedure, opens the electric leakage magnetic pulse valve to spray, shakes off the dust on the filter bag, and falls into the ash hopper and discharges it through the ash discharge valve.

Boiler dust collector cleaning: the outlet of the bag in the filter room of the boiler bag filter chamber is equipped with a blowing pipe, and there is a nozzle port on the side of the pipe facing the center of the dust removal bag, and each blowing pipe has an electromagnetic pulse valve connected to the air bag. When starting to clean the ash, the valve is first opened, and the compressed air is sprayed into the inside of the filter bag from the nozzle, which drives the bag to shake and form a back-blowing airflow to remove the fine dust stuck to the outside of the bag and complete the ash cleaning.

Hello, what is the situation of the air outlet at the bottom of the boiler flue dust collector: because the boiler dust collector has air leakage, a large amount of cold air from the outside is sucked into the boiler dust collector, which makes the local air temperature of the boiler dust collector drop sharply, and the water in the air is analyzed, resulting in the condensation of the boiler dust collector bag. There are many reasons for the air leakage of the bag boiler dust collector, such as the air leakage caused by the leakage welding phenomenon caused by the leakage welding phenomenon of the boiler dust collector shell in the production and installation process, the air leakage caused by the poor sealing of the discharge device, the air leakage caused by the missing welding phenomenon in the installation process of the non-standard pipeline, and the air leakage caused by the poor sealing of the flange connection between the boiler dust collector and the non-standard pipeline.

The advantages of water film dust collector are simple structure, low metal consumption, and low water consumption.

The disadvantage of the water film dust collector is that it is large in height, difficult to arrange, and it is found to carry water in actual operation.

Baghouse is also known as filter dust collector, and the advantages are:

1) The dust removal efficiency is high, generally above 99%, and the dust concentration of the gas at the outlet of the dust collector can be reached to 20 30m3, and the dust removal efficiency of fine dust with sub-micron particle size is high;

2) The structure is relatively simple, and the operation and maintenance are convenient;

3) On the premise of ensuring the same dust removal efficiency, its cost and operating cost are lower than those of the electrostatic precipitator;

4) It is not sensitive to dust characteristics and is not affected by the specific resistance of dust;

5) When using glass fiber and some kinds of synthetic fibers to make filter bags, it can run stably at a temperature of 160 200, and when selecting high-performance filter materials, some temperature resistance can reach 260;

6) When used in the dry desulfurization system, the desulfurization efficiency can be appropriately improved.

7) The range of gas volume is large, and it can handle very high concentrations of dusty gases, so it can be used as a dust collector for various dusty gases. Its capacity can be less than a few cubic meters per minute, as large as hundreds of thousands of cubic meters per minute of airflow, in the use of high-density synthetic fiber filter bag and pulse backwash cleaning method, it can deal with dust concentration of more than 700000mg m3 of dust-containing gas, it can be used for dust source ventilation and dust removal, as well as such as cement, carbon black, asphalt, lime, gypsum, fertilizer and other processes of dust-containing gases to reduce the emission of dust pollutants.

The disadvantages of baghouse are:

1) It is not suitable for operation in a high temperature state, when the moisture content of the dust in the flue gas is more than 25%, 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 is damaged;

2) Compared with electrostatic precipitator, the resistance loss is slightly larger, generally 1000 2000pa;

3) When the combustion of high-sulfur smoke or the flue gas is not treated by desulfurization and other devices, and the concentration of sulfur oxides and nitrogen oxides in the flue gas is very high, except for the FE filter material, other chemical fiber synthetic fiber filter materials will be corroded and damaged, and the life of the bag will be shortened;

4) Cannot work in the "condensation" state.

Electrostatic precipitator, also known as electrostatic precipitator, has the following advantages:

It is suitable for particulate control, and the efficiency can reach 98% 99% for dust particles with a particle size of 1 2 m;

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 compared to other high-efficiency dust collectors. The resistance of the electrostatic precipitator is low, only 100-200pa;

It can treat high temperature (below 400) gas, suitable for large-scale projects, the larger the amount of gas processed, the more obvious its economic effect.

The disadvantages of electrostatic precipitators are:

The equipment is huge and covers a large area;

It consumes a lot of steel and has a large investment;

The structure is complex, and the precision of manufacturing and installation is high;

There are certain requirements for the specific resistance of dust.

Water film dust removal method:

Water film dust removal is a wet dust removal method, the dust collected by the dust collection pole is formed on the surface of the dust collector by water spray or appropriate method, so that the dust deposited on the dust collector electrode and water flow to the lower part of the dust collector together and discharge. This kind of ash cleaning method is more stable in operation, can avoid secondary ash raising, and has high dust removal efficiency. However, the moisture content of the purified flue gas is high, which will cause corrosion to pipelines and equipment, and the slurry discharged from ash cleaning will cause secondary pollution.

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.

High pressure loss.

The electrostatic precipitator has high dust removal efficiency, up to more than 99%, small pressure loss, and is widely used. Large footprint.

The dust removal efficiency of the water film dust collector is very high, more than 99% higher than that of the general dust collector, and it can be very clean for some fine dust. The main disadvantage of water film dust removal is that it cannot operate in a high-temperature state and cannot work at a high temperature.