The dryer has a large air volume, high dust concentration, large water content, high dew point, easy condensation, high discharge point and wide pollution range. It is a difficult point in dust removal technology. The exhaust gas at the tail of the dryer is related to the process conditions of each factory. Individual enterprises are used for drying various materials. The production changes are large, the opening and closing are frequent, and the fluctuation range is large. Moreover, coal is used as the drying heat source and the sulfur in the exhaust gas. Oxide has a corrosive effect on metal structural parts, which brings certain difficulties to the selection of the dust collector.
Cyclone dust removal technology Cyclone dust removal technology has low equipment cost, can handle high temperature gas, easy to operate, and is suitable for gas with high dust concentration. The working principle is that under the action of the fan, the dust-containing airflow enters the volute of the dust collector in a tangential direction at a higher speed from the inlet, and performs a spiral rotation motion from top to bottom, and the dust particles are smashed under the action of centrifugal force. The outer wall is rotated downwards along the wall surface, and the shaft is turned to the axis with the contraction of the cone, and is returned by the lower resistance, and is spirally rotated from the bottom to the core through the core tube. The dust particles on the outer wall are driven by gravity and downward moving airflow, and fall into the ash bucket along the wall to achieve the purpose of dust removal. Because the cyclone dust collector relies on the inertia separation of dust particles, the dust removal efficiency is proportional to the particle size, the particle size is large and the dust removal effect is good; the particle size is small, the dust removal effect is poor, and the dust of 20 microns or more is generally treated, and the dust removal efficiency is 70% to 90%. .
The bag dust removal technology bag dust collector is stable, efficient, simple to maintain, and reliable in operation. It is recognized by everyone. It has a dust removal efficiency of up to 99% for dust particles of 0.1 micron. The dust collector of the exhaust gas of the dryer does not need to consider the emission concentration exceeding the standard. problem. The dryer anti-condensation glass fiber bag dust collector is the ideal dust removal and purification equipment. The device adopts microcomputer control, chamber back-blowing, timing cleaning, and is equipped with temperature detection display. The over-temperature alarm device adopts CW300-FcA anti-condensation glass fiber filter bag, which can effectively prevent the filter bag from dew condensation and will not burn. Bad filter bag. Hebei Taihang Group Co., Ltd. Diameter 3×24m slag dryer changed the two-stage dust removal process to the first-class LFEF7×358—HSY/H anti-condensation bag dust collector. The amount of exhaust gas is 42621 standard cubic meters per hour as determined by the environmental protection department. The imported dust concentration is 69,620 mg per standard cubic meter, and the export dust concentration is 147 mg per standard cubic meter, which meets the national emission standard. Not only has the output been increased, but also the dry materials have been recovered. The annual economic benefit has reached more than 700,000 yuan, and at the same time, it has received obvious social benefits. However, bag dust collectors have the disadvantages of large floor space and high investment. With the development of filter bag film coating technology, this shortcoming will be overcome and the use will be more extensive.
High-voltage electrostatic precipitator technology High-voltage electrostatic precipitator technology is to convert 50 Hz, 220 volts AC to 100 kW or more to the corona pole (cathode) to form a non-uniform high-voltage electric field, so that the gas ionization generates a large number of negative ions and electrons, so that the electric field is entered. The gas dust is charged. Under the action of the electric field force, the charged dust tends to the opposite electrode. Generally, the anode is a dust collecting pole, which is discharged into the ash hopper by vibrating to complete the purification and dust removal process. High-efficiency electrostatic precipitator can be widely used in dust pollution of building materials, metallurgy, chemical industry and other industries. It handles high dust concentration. For 0î€01 micron fine or high specific resistance dust, the dust removal effect is more obvious. The series products meet the drying equipment with different air volume, and the matching is flexible, which is suitable for the dust treatment of the exhaust gas characteristics of the dryer.
Wet dust removal technology The wet dust removal technology is that the dust-containing gas is sent from the draft fan through the air duct to the lower part of the dust removal tower. As the section becomes larger, the flow rate is reduced, and the coarse-grained dust first settles in the airflow, and the fine dust rises with the airflow. The water droplets and the dust flow are reversed, and the dust is continuously increased by the wet weight. Under the action of gravity, the mud is lifted against the lift of the airflow and enters the sedimentation tank through the lower pipeline to achieve the purpose of dust removal. Mud water is generally precipitated by clearing water from 2 to 3 cycles, and is pumped into the dust removal tower for recycling without causing secondary pollution. The dust-removing technology positive pressure operation is generally used for the drying of clay, and the drying of various materials (original materials), the recycled materials are easy to be mixed and cannot be utilized, and the wind blades are worn a lot. The Suzhou Cement Plant uses a wet dust removal technology on a 2.2×12 m diameter clay dryer with a discharge concentration of 132 mg per standard cubic meter, meeting national emission standards. The sedimentation tank is cleaned once a year, and the wet soil is dried and stored in the warehouse as a raw material for production. The dust removal system has high dust collection efficiency, low resistance, no secondary pollution, flexible process, reliable operation, low power consumption, low investment, no condensation, strong adaptability, and good economic and social benefits.
Gravity sedimentation + high-voltage electrostatic dust removal technology consists of sedimentation chamber and high-voltage static electricity. The dust-removing process is that the dust-containing exhaust gas is sent to the sedimentation chamber by the draft fan at high speed through the air duct. When it collides with the wall, the airflow direction changes, the wind speed is rapidly reduced, and the particle dust settles. After being discharged by the conveying device, the fine dust enters the electric field of the high-voltage electrostatic precipitator with the airflow, and is charged under the continuous bombardment of the ions, and the fly to the dust collecting pole is collected and discharged, and the purified gas is discharged into the atmosphere by the air duct. In the two-stage dust removal process, the primary sedimentation chamber collects large particles of dust above 40 microns, which reduces the dust concentration of the gas, which is beneficial to improve the dust removal efficiency of the high-voltage electrostatic precipitator. The wind speed can be larger, the equipment can be smaller, and the investment can be effectively reduced. The dust removal process of the 2î€2×12m clay dryer in Zhejiang Lanxi Cement Plant, the dusty exhaust gas is sent from the dryer tail cover by the draft fan through the air duct into the square sedimentation chamber made of steel plate. After the exhaust gas settles, it enters the high-voltage electrostatic dust removal. The device is purified and discharged into the atmosphere. The induced draft fan and the settling chamber are installed indoors, the electrostatic precipitator is installed outdoors, the dust removal system is operated normally, and it is used for many years without condensation. The emission concentration is 48 mg per standard cubic meter, which is lower than the national emission standard.
Cyclone + high-voltage electrostatic dust removal technology The dust removal technology is that the dusty exhaust gas of the dryer enters the pre-stage high-efficiency cyclone dust collector for pre-dusting. The dust is discharged by the ash hopper through the ash discharge device, the dust concentration of the airflow is reduced, and then the high-voltage static electricity is entered. The secondary dust removal of the dust collector, the purified gas blower is discharged into the atmosphere, so that the dust removal efficiency is improved, the process is flexible, safe and reliable.
The application of the exhaust gas dedusting technology of the dryer not only protects the environment, reduces the labor intensity, but also increases the output of the Taiwanese period and reduces the expenditure on sewage charges. The recycled dust is a good raw material for cement production and has significant economic benefits. Social and environmental benefits.
The article is an independent view of the author and does not represent Alibaba's position as a business friend. Reprinting this article requires the author's consent, with a link to the source and article.
Cyclone dust removal technology Cyclone dust removal technology has low equipment cost, can handle high temperature gas, easy to operate, and is suitable for gas with high dust concentration. The working principle is that under the action of the fan, the dust-containing airflow enters the volute of the dust collector in a tangential direction at a higher speed from the inlet, and performs a spiral rotation motion from top to bottom, and the dust particles are smashed under the action of centrifugal force. The outer wall is rotated downwards along the wall surface, and the shaft is turned to the axis with the contraction of the cone, and is returned by the lower resistance, and is spirally rotated from the bottom to the core through the core tube. The dust particles on the outer wall are driven by gravity and downward moving airflow, and fall into the ash bucket along the wall to achieve the purpose of dust removal. Because the cyclone dust collector relies on the inertia separation of dust particles, the dust removal efficiency is proportional to the particle size, the particle size is large and the dust removal effect is good; the particle size is small, the dust removal effect is poor, and the dust of 20 microns or more is generally treated, and the dust removal efficiency is 70% to 90%. .
The bag dust removal technology bag dust collector is stable, efficient, simple to maintain, and reliable in operation. It is recognized by everyone. It has a dust removal efficiency of up to 99% for dust particles of 0.1 micron. The dust collector of the exhaust gas of the dryer does not need to consider the emission concentration exceeding the standard. problem. The dryer anti-condensation glass fiber bag dust collector is the ideal dust removal and purification equipment. The device adopts microcomputer control, chamber back-blowing, timing cleaning, and is equipped with temperature detection display. The over-temperature alarm device adopts CW300-FcA anti-condensation glass fiber filter bag, which can effectively prevent the filter bag from dew condensation and will not burn. Bad filter bag. Hebei Taihang Group Co., Ltd. Diameter 3×24m slag dryer changed the two-stage dust removal process to the first-class LFEF7×358—HSY/H anti-condensation bag dust collector. The amount of exhaust gas is 42621 standard cubic meters per hour as determined by the environmental protection department. The imported dust concentration is 69,620 mg per standard cubic meter, and the export dust concentration is 147 mg per standard cubic meter, which meets the national emission standard. Not only has the output been increased, but also the dry materials have been recovered. The annual economic benefit has reached more than 700,000 yuan, and at the same time, it has received obvious social benefits. However, bag dust collectors have the disadvantages of large floor space and high investment. With the development of filter bag film coating technology, this shortcoming will be overcome and the use will be more extensive.
High-voltage electrostatic precipitator technology High-voltage electrostatic precipitator technology is to convert 50 Hz, 220 volts AC to 100 kW or more to the corona pole (cathode) to form a non-uniform high-voltage electric field, so that the gas ionization generates a large number of negative ions and electrons, so that the electric field is entered. The gas dust is charged. Under the action of the electric field force, the charged dust tends to the opposite electrode. Generally, the anode is a dust collecting pole, which is discharged into the ash hopper by vibrating to complete the purification and dust removal process. High-efficiency electrostatic precipitator can be widely used in dust pollution of building materials, metallurgy, chemical industry and other industries. It handles high dust concentration. For 0î€01 micron fine or high specific resistance dust, the dust removal effect is more obvious. The series products meet the drying equipment with different air volume, and the matching is flexible, which is suitable for the dust treatment of the exhaust gas characteristics of the dryer.
Wet dust removal technology The wet dust removal technology is that the dust-containing gas is sent from the draft fan through the air duct to the lower part of the dust removal tower. As the section becomes larger, the flow rate is reduced, and the coarse-grained dust first settles in the airflow, and the fine dust rises with the airflow. The water droplets and the dust flow are reversed, and the dust is continuously increased by the wet weight. Under the action of gravity, the mud is lifted against the lift of the airflow and enters the sedimentation tank through the lower pipeline to achieve the purpose of dust removal. Mud water is generally precipitated by clearing water from 2 to 3 cycles, and is pumped into the dust removal tower for recycling without causing secondary pollution. The dust-removing technology positive pressure operation is generally used for the drying of clay, and the drying of various materials (original materials), the recycled materials are easy to be mixed and cannot be utilized, and the wind blades are worn a lot. The Suzhou Cement Plant uses a wet dust removal technology on a 2.2×12 m diameter clay dryer with a discharge concentration of 132 mg per standard cubic meter, meeting national emission standards. The sedimentation tank is cleaned once a year, and the wet soil is dried and stored in the warehouse as a raw material for production. The dust removal system has high dust collection efficiency, low resistance, no secondary pollution, flexible process, reliable operation, low power consumption, low investment, no condensation, strong adaptability, and good economic and social benefits.
Gravity sedimentation + high-voltage electrostatic dust removal technology consists of sedimentation chamber and high-voltage static electricity. The dust-removing process is that the dust-containing exhaust gas is sent to the sedimentation chamber by the draft fan at high speed through the air duct. When it collides with the wall, the airflow direction changes, the wind speed is rapidly reduced, and the particle dust settles. After being discharged by the conveying device, the fine dust enters the electric field of the high-voltage electrostatic precipitator with the airflow, and is charged under the continuous bombardment of the ions, and the fly to the dust collecting pole is collected and discharged, and the purified gas is discharged into the atmosphere by the air duct. In the two-stage dust removal process, the primary sedimentation chamber collects large particles of dust above 40 microns, which reduces the dust concentration of the gas, which is beneficial to improve the dust removal efficiency of the high-voltage electrostatic precipitator. The wind speed can be larger, the equipment can be smaller, and the investment can be effectively reduced. The dust removal process of the 2î€2×12m clay dryer in Zhejiang Lanxi Cement Plant, the dusty exhaust gas is sent from the dryer tail cover by the draft fan through the air duct into the square sedimentation chamber made of steel plate. After the exhaust gas settles, it enters the high-voltage electrostatic dust removal. The device is purified and discharged into the atmosphere. The induced draft fan and the settling chamber are installed indoors, the electrostatic precipitator is installed outdoors, the dust removal system is operated normally, and it is used for many years without condensation. The emission concentration is 48 mg per standard cubic meter, which is lower than the national emission standard.
Cyclone + high-voltage electrostatic dust removal technology The dust removal technology is that the dusty exhaust gas of the dryer enters the pre-stage high-efficiency cyclone dust collector for pre-dusting. The dust is discharged by the ash hopper through the ash discharge device, the dust concentration of the airflow is reduced, and then the high-voltage static electricity is entered. The secondary dust removal of the dust collector, the purified gas blower is discharged into the atmosphere, so that the dust removal efficiency is improved, the process is flexible, safe and reliable.
The application of the exhaust gas dedusting technology of the dryer not only protects the environment, reduces the labor intensity, but also increases the output of the Taiwanese period and reduces the expenditure on sewage charges. The recycled dust is a good raw material for cement production and has significant economic benefits. Social and environmental benefits.
The article is an independent view of the author and does not represent Alibaba's position as a business friend. Reprinting this article requires the author's consent, with a link to the source and article.
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