What are the equipment categories of dust removal equipment manufacturers ?
(1) Mechanical dust removal equipment includes gravity dust removal equipment, inertial dust removal equipment, centrifugal dust removal equipment, etc.
(2) Washing type dust removal equipment includes water bath dust removal equipment, foam dust removal equipment, venturi tube dust removal equipment, water film dust removal equipment, etc.
(3) Filter type dust removal equipment includes bag dust removal equipment and particle layer dust removal equipment.
(4) Electrostatic dust removal equipment.
(5) Magnetic dust removal equipment.
Inertial dust removal equipment is a dust removal equipment that makes the dust-containing gas collide with the baffle or sharply change the direction of the air flow, and uses inertial force to separate and capture dust. Inertial dust removal equipment is also called inert dust removal equipment.
Inertial dust removal equipment is divided into two types: collision type and rotary type: the former is equipped with one or more baffles along the airflow direction, and the dust-containing gas collides with the baffle to separate the dust particles from the gas. Obviously, the higher the speed of the gas before it hits the baffle, and the lower it is after the collision, the less dust it carries and the higher the dust removal efficiency. The latter is to change the direction of the dust-containing gas many times and separate the dust during the turning process. The smaller the radius of curvature of the gas turn. The higher the steering speed, the higher the dust removal efficiency.
The performance of inertial dust removal equipment varies depending on the structure. When the gas flow rate in the equipment is below 10m / S, the pressure loss is between 200-1000Pa, and the dust removal efficiency is 50% -70%. In practical applications, inertial dust removal equipment is generally placed in the first stage of a multi-stage dust removal system to separate coarse particles of dust. It is particularly suitable for capturing dry dust with a particle size greater than 10 μm. Not suitable for removing cohesive dust and fibrous dust. Inertial dust removal equipment can also be used to separate mist droplets. At this time, it is required that the flow rate of gas in the equipment is 1-2m / s.
Biological nano-membrane dust removal equipment is a dust removal equipment that has begun to rise abroad in recent years. It uses the most advanced biological nano-membrane technology today. By spraying BME nano-membrane on the surface of materials, it minimizes the generation of dust during production and processing. . This type of dust removal technology belongs to dust removal before dust emission. Compared with other dust removal after production, it has great advantages, which can effectively control the dust emission during the entire process of material production. The dust generated during the crushing process is aggregated into fine materials and eventually becomes a finished material, which can increase the output by 0.5% -3%. In addition, it can effectively prevent PM2.5 and PM10 pollution, which is in line with national environmental protection and energy saving. Row technology policy. Compared with wet dust removal and bag dust removal, bio-nano-membrane dust suppression has no water pollution, the preparation has no side effects on the environment, does not affect the quality of finished materials, and has low input costs. It is suitable for mines, buildings, quarries, and heaps. Control of dust pollution in factories, ports, thermal power plants, steel plants, garbage collection and disposal sites. Nano-membrane dust removal has been used in different applications overseas, and has gradually begun to be applied in many domestic provinces and cities.
Spray type dust removal equipment sprays water into a mist through the nozzle in the dust removal equipment. When dust-containing smoke passes through the misty space, due to the collision, interception and condensation between dust particles and droplets, the dust particles follow the droplets. Landed down.
This kind of dust removal equipment has simple structure, low resistance and convenient operation. Its outstanding advantage is that there are small gaps and orifices in the dust removal equipment, which can handle smoke with high dust concentration without causing blockage.
And because it sprays thick droplets, it does not require a mist nozzle, which is more reliable. The spray-type dust removal equipment can use circulating water until the particulate matter in the washing solution reaches a relatively high level, which greatly simplifies the process. Water treatment facilities. Therefore, this type of dust removal equipment is still used by many enterprises. Its disadvantages are that the equipment is relatively large, its ability to handle fine dust is low, and it requires a large amount of water, so it is often used to remove flue gas with large dust particle size and high dust concentration.
Commonly used spray type dust removal equipment is divided into three structures according to the type of gas and liquid flowing in the dust removal equipment:
(1) Downstream spray type, that is, the gas and water droplets flow in the same direction
(2) Counter-current spray type, that is, the liquid is sprayed against the air flow
(3) Cross-flow spray type, that is, spraying liquid perpendicular to the direction of air flow.
Aerosol dust removal has changed the disadvantages of larger volume, low dust removal capacity and large water consumption caused by the traditional spray dust removal equipment, which greatly improves the dust removal effect.
System technology principle
Gravity dust reduction and water mist pressure dust are implemented. Liquid and gas are delivered to the nozzle by pressure. The liquid and gas are mixed at the nozzle to produce fine atomized droplets that are sprayed out of the nozzle, thereby generating a water mist with a diameter of 1μm-10μm. Particles, effectively adsorb the dust suspended in the air, quickly aggregate into particles and settle down by gravity to achieve the purpose of suppressing dust and improving the environment.
The system has a good atomization adjustment function. The atomization device can be adjusted by changing the pressure of gas and liquid, so as to achieve the ideal ratio of gas flow rate to liquid flow rate, and provide sprays with fine droplet size.
Electric dedusting equipment is a necessary supporting equipment for thermal power plants, and its function is to remove particulate smoke and dust from the flue gas emitted from combustion stoves or oil-fired boilers, thereby greatly reducing the amount of smoke and dust discharged into the atmosphere, which is to improve environmental pollution , Important environmental protection equipment to improve air quality. 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 is positively charged, and then the flue gas enters the passage of the electrostatic precipitator equipped with a multilayer cathode plate.
Due to the mutual adsorption of the positively charged soot and the cathode electric plate, the particulate soot in the flue gas is adsorbed on the cathode, and the cathode plate is regularly hit, so that the soot with a certain thickness falls on the dual function of self-weight and vibration In the ash bucket below the structure, the purpose of removing smoke and dust from the flue gas is achieved. Due to the large power of general units in thermal power plants, such as 600,000 kilowatt units, the coal consumption per hour reaches about 180T, and the amount of smoke and dust can be imagined. Therefore, the corresponding structure of the electrostatic precipitator is relatively large. The size of the cross section of the main structure of the electrostatic precipitator used in general thermal power plants is about 25 ~ 40 × 10 ~ 15m. If the height of the ash bucket of 6 meters and the density of the smoke transportation space are added, the height of the entire electrostatic precipitator is 35 meters Above, for such a large steel structure main body, it is necessary to consider not only autonomous, smoke and dust loads, wind loads, but also static and dynamic analysis under the action of seismic loads. At the same time, structural stability must also be considered.
The main structure of the electrostatic precipitator is a steel structure, all of which are welded by section steel. The outer surface is covered with skin (thin steel plate) and thermal insulation material, for the convenience of design, manufacture and installation. The structural design adopts a layered form, each piece is composed of several frame-type main beams, and the pieces are connected by a beam. In order to install the skin and heat insulation layer, a welding secondary beam is added between the main beams. For such a large structure, how to connect them in kind, the workload and the number of units will be very large.
According to the actual design requirements of the project and the main structure design of the electrostatic precipitator, the structural strength, structural stability and the maximum displacement of the main beam of the suspended cathode plate are mainly examined. In the local area, the fatigue damage of the connection between the cathode plate and the main beam under long-term periodic impact is mainly investigated; the optimal frequency selection of smoke and dust on the cathode plate; the surface of the structure (thin plate) and the main and secondary beams under wind The best choice of connection and stiffness between them and so on.