2 thoughts on “Ventilation and dust removal principle”
Joanne
The energy required for air flow in the mechanical ventilation system is supplied by the fan. M commonly used fans: centrifugal type and axial flow type: ① centrifugal fans, high fan heads and small noise. The rear -curved fan with winged blades is a low noise High -efficiency fan. ② axial flow fan. With the same diameter and speed of the impeller, the wind pressure is lower than the centrifugal type, and the noise is higher than the centrifugal type. Simple, you can be installed directly on the wall or in the pipeline. The fan used in the ventilation system is divided into dustproof fan, explosion -proof fan, and anti -corrosion fan according to the conveying medium. The air filter In order to ensure human health and meet the requirements of the air cleanliness of some industrial production processes (such as the food industry), the air sent to the indoor must be purified to varying degrees. In the air supply system, the air filter is commonly used to remove the dust in the air. Depending on the filtration efficiency, the air filter is divided into three categories: coarse effect, medium -efficiency, and efficient. Usually use metal silk mesh, glass, foam plastic, synthetic fiber and filter paper as filtering materials. Themark and harmful gas treatment equipment When the concentration of pollutants in the air exceeds the national emissions standards, the dust collector or harmful gas treatment equipment must be set to achieve the discharge standards to discharge the atmosphere. Them dust collector is a kind of device that isolated solid particles in the gas, which is used in industrial ventilation systems to remove dust. Some production processes (such as crushing raw materials, non -ferrous metal smelting, grain processing, etc.) excreted the powder -like materials contained in the air are the raw materials or products of production, which is economic significant for recycling them. Therefore, in these departments, the dust collector is both environmental protection equipment and production equipment. Coufeer in the ventilation dust removal system is: cyclone dust collector, bag dust collector, wet dust collector, static dust collector, etc. The harmful gas treatment methods commonly used in ventilation systems include absorption and adsorption method. The absorption method is to use the appropriate liquid as an absorbent to contact the air containing the air -containing air, so that the harmful gases are absorbed by the absorbent or chemically react with the absorbent to become harmless substances. The adsorption method is to use some substances with greater adsorption ability as an adsorbent to adsorb harmful gases. Activated carbon is the most widely used adsorbent in industry. The adsorption method is suitable for handling low -concentration harmful gases with high harm, and the adsorption efficiency can be close to 100 %. Some harmful gases are currently lacking economic and effective treatment methods. Under the circumstances, they can use high chimneys to discharge unprocessed or incomplete air into high altitude. This method is called high -altitude emissions. In areas where the air heater is very cold in winter, the outdoor cold air cannot be sent to the room, and the air must be heated. Surface heat exchangers are usually used to heat the air with hot water or steam. The air screen air is ejected from a seam -shaped hole at a certain speed, forming a plane shot. If it is set to inhale this airflow on the opposite side, it will form a airflow like curtain between blowing and wind -absorbing. The device that uses the air on both sides of the airflow of the airflow itself is called the air curtain. The aura installed at the entrance of the building is called the gate air screen. The gate air curtain can prevent outdoor wind, dust, insects, polluting air and odor invading the room, reducing the loss of heat (cold) of the building, and not hinder the passage of people and things. The gate air screen has been widely used in industrial factories, refrigerators, department stores, theaters, etc. with frequent entrance to and out of personnel vehicles. In civil buildings, most of the upper and off -sending formulas are used, and the sub -send and side delivery types are mostly used in industrial buildings. The aura is also used to control the diffusion of pollutants in the local area. The device that is used as this purpose is called a air screen partition or blowing rowing cover. Use a lot. Compared with traditional local exhaust hoods, its power consumption is small, the pollution control effect is good, and it does not prevent production operations.
The ventilation and dust removal system consists of a vacuum cover, dust collector, duct and fan called a ventilation dust removal system, as shown in the figure below. However, because the dust source is different from the selected dust removal equipment, not each system must include these devices. For example, smoke gas can be pulled directly from the industrial kiln, and there can be no vacuum cover; when the dust removal unit is set on the spot, the gas can be directly discharged into the room after purification, and you can do not blasting. And when using the residual pressure and exhaust of the process equipment, there can be no fan. However, when the dust concentration of the excreted gas exceeds the emission standard, there should be a dust collector.
The ventilation dust removal system
1 — Vacuum Hand 2 — Dust Cauge 4 — Finoma The form of the system should be determined according to the conditions of process equipment configuration, production process and plant structure to determine
. It can usually be divided into the following three types:
1. Local style. The local ventilation dust removal system is to directly set the dust collector or the dust removal unit on the dust -producing equipment to capture and recycle dust on the spot. This system has a compact layout, simple structure, and convenient maintenance management. It can also achieve the purpose of preventing dust from outside and purifying dust. However, due to the limitations of production and process conditions, this system is currently only applied to certain dust -producing equipment, such as sand mixed machines, belt machine transfer points, and warehouses.
2. Differential. The decentralized ventilation dust removal system is to do one or several dust production points -a system, the dust collector and the fan are installed near the dust -producing equipment. Generally, the production operator is treated and managed without a special person. This system has the advantages of short pipelines, simple layout, easy resistance to balance, and convenient air volume adjustment, but it is more troublesome to deal with after dust. It is suitable for occasions where dust production equipment is relatively decentralized and the factory has the location of the dust removal equipment, such as sintering plants, casting plants (workshops), and so on. The mechanical processing workshop mostly uses single -machine dust removal, that is, each machine tool is equipped with a dust removal unit, and the dust -containing gas is directly discharged into the workshop after purification.
3. centralized. The centralized ventilation and dust removal system is to concentrate the dust production points of multiple dust production points or the entire workshop and even the entire factory into a system. There are special dust removal rooms, which are managed by a special person. This system has a large air volume, which is convenient for centralized management. It is easier to process after dust, but the head of the pipeline is complicated, the resistance is not easy to balance, and the air volume adjustment is difficult. It is suitable for the concentrated dust production equipment and conditions for setting up the dust removal room, such as refractory material factories. For multi -storey plants with multiple dust -producing points, all the top floors can be used as the dust removal room, and the dust production points of each floor can be connected to the top dust collector to purify the atmosphere of the back row.
The energy required for air flow in the mechanical ventilation system is supplied by the fan.
M commonly used fans: centrifugal type and axial flow type:
① centrifugal fans, high fan heads and small noise. The rear -curved fan with winged blades is a low noise High -efficiency fan.
② axial flow fan. With the same diameter and speed of the impeller, the wind pressure is lower than the centrifugal type, and the noise is higher than the centrifugal type. Simple, you can be installed directly on the wall or in the pipeline.
The fan used in the ventilation system is divided into dustproof fan, explosion -proof fan, and anti -corrosion fan according to the conveying medium.
The air filter In order to ensure human health and meet the requirements of the air cleanliness of some industrial production processes (such as the food industry), the air sent to the indoor must be purified to varying degrees. In the air supply system, the air filter is commonly used to remove the dust in the air. Depending on the filtration efficiency, the air filter is divided into three categories: coarse effect, medium -efficiency, and efficient. Usually use metal silk mesh, glass, foam plastic, synthetic fiber and filter paper as filtering materials.
Themark and harmful gas treatment equipment When the concentration of pollutants in the air exceeds the national emissions standards, the dust collector or harmful gas treatment equipment must be set to achieve the discharge standards to discharge the atmosphere.
Them dust collector is a kind of device that isolated solid particles in the gas, which is used in industrial ventilation systems to remove dust. Some production processes (such as crushing raw materials, non -ferrous metal smelting, grain processing, etc.) excreted the powder -like materials contained in the air are the raw materials or products of production, which is economic significant for recycling them. Therefore, in these departments, the dust collector is both environmental protection equipment and production equipment.
Coufeer in the ventilation dust removal system is: cyclone dust collector, bag dust collector, wet dust collector, static dust collector, etc.
The harmful gas treatment methods commonly used in ventilation systems include absorption and adsorption method. The absorption method is to use the appropriate liquid as an absorbent to contact the air containing the air -containing air, so that the harmful gases are absorbed by the absorbent or chemically react with the absorbent to become harmless substances. The adsorption method is to use some substances with greater adsorption ability as an adsorbent to adsorb harmful gases. Activated carbon is the most widely used adsorbent in industry. The adsorption method is suitable for handling low -concentration harmful gases with high harm, and the adsorption efficiency can be close to 100 %. Some harmful gases are currently lacking economic and effective treatment methods. Under the circumstances, they can use high chimneys to discharge unprocessed or incomplete air into high altitude. This method is called high -altitude emissions. In areas where the air heater is very cold in winter, the outdoor cold air cannot be sent to the room, and the air must be heated. Surface heat exchangers are usually used to heat the air with hot water or steam.
The air screen air is ejected from a seam -shaped hole at a certain speed, forming a plane shot. If it is set to inhale this airflow on the opposite side, it will form a airflow like curtain between blowing and wind -absorbing. The device that uses the air on both sides of the airflow of the airflow itself is called the air curtain. The aura installed at the entrance of the building is called the gate air screen. The gate air curtain can prevent outdoor wind, dust, insects, polluting air and odor invading the room, reducing the loss of heat (cold) of the building, and not hinder the passage of people and things. The gate air screen has been widely used in industrial factories, refrigerators, department stores, theaters, etc. with frequent entrance to and out of personnel vehicles. In civil buildings, most of the upper and off -sending formulas are used, and the sub -send and side delivery types are mostly used in industrial buildings. The aura is also used to control the diffusion of pollutants in the local area. The device that is used as this purpose is called a air screen partition or blowing rowing cover. Use a lot. Compared with traditional local exhaust hoods, its power consumption is small, the pollution control effect is good, and it does not prevent production operations.
The ventilation and dust removal system consists of a vacuum cover, dust collector, duct and fan called a ventilation dust removal system, as shown in the figure below. However, because the dust source is different from the selected dust removal equipment, not each system must include these devices. For example, smoke gas can be pulled directly from the industrial kiln, and there can be no vacuum cover; when the dust removal unit is set on the spot, the gas can be directly discharged into the room after purification, and you can do not blasting. And when using the residual pressure and exhaust of the process equipment, there can be no fan. However, when the dust concentration of the excreted gas exceeds the emission standard, there should be a dust collector.
The ventilation dust removal system
1 — Vacuum Hand 2 — Dust Cauge 4 — Finoma
The form of the system should be determined according to the conditions of process equipment configuration, production process and plant structure to determine
. It can usually be divided into the following three types:
1. Local style. The local ventilation dust removal system is to directly set the dust collector or the dust removal unit on the dust -producing equipment to capture and recycle dust on the spot. This system has a compact layout, simple structure, and convenient maintenance management. It can also achieve the purpose of preventing dust from outside and purifying dust. However, due to the limitations of production and process conditions, this system is currently only applied to certain dust -producing equipment, such as sand mixed machines, belt machine transfer points, and warehouses.
2. Differential. The decentralized ventilation dust removal system is to do one or several dust production points -a system, the dust collector and the fan are installed near the dust -producing equipment. Generally, the production operator is treated and managed without a special person. This system has the advantages of short pipelines, simple layout, easy resistance to balance, and convenient air volume adjustment, but it is more troublesome to deal with after dust. It is suitable for occasions where dust production equipment is relatively decentralized and the factory has the location of the dust removal equipment, such as sintering plants, casting plants (workshops), and so on. The mechanical processing workshop mostly uses single -machine dust removal, that is, each machine tool is equipped with a dust removal unit, and the dust -containing gas is directly discharged into the workshop after purification.
3. centralized. The centralized ventilation and dust removal system is to concentrate the dust production points of multiple dust production points or the entire workshop and even the entire factory into a system. There are special dust removal rooms, which are managed by a special person. This system has a large air volume, which is convenient for centralized management. It is easier to process after dust, but the head of the pipeline is complicated, the resistance is not easy to balance, and the air volume adjustment is difficult. It is suitable for the concentrated dust production equipment and conditions for setting up the dust removal room, such as refractory material factories. For multi -storey plants with multiple dust -producing points, all the top floors can be used as the dust removal room, and the dust production points of each floor can be connected to the top dust collector to purify the atmosphere of the back row.