Different from the density of dust and gas, the dust naturally settles from the airflow by its own gravity to achieve the purpose of separating or trapping particles in the dusty gas flow. The disadvantage is that the dust removal efficiency is extremely low, and it is generally used in small boilers.
2, inertial force dust removal method:
The inertial flow of dust and gas in motion is different, so that the dust is separated from the airflow. The general method for achieving inertial separation in practical applications is to cause the dust-containing airflow to impinge on the baffle, causing a sharp change in the direction of the airflow. The dust particles in the airflow have a large inertia and cannot be sharply turned with the airflow, and are separated from the airflow.
Inertial dust collectors are suitable for the removal of non-tacky, non-fibrous dust. The structure of the device is simple and the resistance is small; but the separation efficiency is low, and only coarse dust particles of 10-20 μm or more can be collected, and can only be used for the first stage dust removal in the multi-stage dust removal.
3, centrifugal force dust removal method:
By using the flow velocity of the dust-containing gas, the airflow is continuously rotated in a certain direction in the dust removing device, and the particles obtain centrifugal force in the rotation of the airflow, thereby causing the particles to separate from the airflow. Commonly used dust removal devices include cyclone dust collectors and cyclone dust collectors. The most commonly used ones are cyclone dust collectors. The cyclone dust collectors have high dust removal efficiency and have good dust removal efficiency for particles larger than 5μm. It is suitable for the removal of non-viscous and non-fibrous dust, and can be used for dust removal and purification of high-temperature flue gas. Therefore, it is widely used in boiler flue gas dedusting, multi-stage dust removal and dust removal.
4, wet dust removal method:
The liquid (usually water) is used to wash the dust-containing gas, and the formed liquid film, droplets or bubbles are used to trap the dust particles in the gas. The dust particles are discharged with the liquid, and the gas is purified. The liquid film, droplets or bubbles are mainly passed through inertia. Collision, the diffusion of fine dust particles, the agglomeration of the liquid film and droplets to humidify the dust particles and the adhesion to the dust particles, to achieve the purpose of capturing dust particles in the exhaust gas.
The wet dust collector has high dust removal efficiency, especially the high energy wet scrubber, which can maintain high dust removal efficiency when removing dust particles below 0.1μm. The wet scrubber has high efficiency and good safety for purifying high temperature, high humidity, flammable and explosive gases. The wet dust remover removes the dust particles in the exhaust gas, and at the same time removes the harmful and toxic gaseous pollutants in the exhaust gas through the absorption of the liquid, and has a better desulfurization effect. It is suitable for non-stick and non-fibrous.
5. Filter dust removal method:
The filter type dust removal is to make the dust-containing gas pass through the porous filter material, and the dust particles in the gas are intercepted to purify the gas. The filter material filters the dust-containing gas, and is divided into internal filtration and external filtration according to the dust filtration method. The filter material of the filter dust collector is to screen the particles through the pores of the filter material, and the particles collide with the inertial collision in the air movement, the diffusion of fine particles, and the combined effects of electrostatic attraction and gravity sedimentation to achieve dust removal. the goal of.
At present, the filter dust removal device is a bag type dust collector. The structure is to hang several circular or elliptical filter bags in the dust collection chamber of the dust collector. When the dusty airflow passes through the bag wall of the filter bags, the dust particles are The wall of the bag is trapped and collected on the inner or outer wall of the bag to be trapped.
Bag type dust collectors can be divided into mechanical vibrating bag type dust collectors, airflow back blowing bag type dust collectors, gas ring back blowing bag type dust collectors, and pulse jet bag type dust collectors according to different cleaning methods. Pulse jet bag filter. The pulse jet bag filter has the advantages of large gas volume, high efficiency, less damage to the filter bag, and is widely used in large and medium dust removal projects.
The bag filter is a high-efficiency dust collector, which has a strong trapping effect on fine dust. It is widely used in the dust removal of various industrial waste gases, but it is not suitable for the treatment of oily, watery and cohesive dust, and it is also uncomfortable. For the treatment of high temperature dusty gas, there is no desulfurization effect.
6, electric dust removal method:
Electrostatic precipitator is the separation of solid particles or liquid particles from a gas stream by the action of electrostatic force (Coulomb force) generated by a high voltage electric field. The electric field should be a high-voltage direct current non-uniform electric field, the discharge electrode constituting the electric field is a linear electrode having a large surface curvature, and the dust collector is a plate-shaped electrode or a tubular electrode having a large area.
When a high DC voltage is applied between the discharge electrode and the dust collecting pole, the uneven electric field formed between the two poles makes the electric field intensity near the electrode large. When the voltage is applied to a certain value, the discharge electrode generates corona discharge and generates A large number of electrons and anions migrate to the dust collecting pole under the action of an electric field force. Neutral gas molecules easily capture these electrons or anions to form negative ions during migration. When these negatively charged particles collide with the dust particles in the gas stream and attach to them, the dust particles are negatively charged. The charged dust is driven to the dust collecting pole by the Coulomb force in the electric field, and the dust particles are deposited on the surface of the dust collecting pole and deposited on the dust collecting pole. When the dust is deposited to a certain thickness, it is eliminated by mechanical vibration.
The equipment commonly used in electric dust removal is an electric precipitator. The electrostatic precipitator is a high-efficiency dust collector with a dust removal efficiency of over 99%. It has excellent fine dust collection performance. The minimum particle size can be up to 0.05μm, and any dust removal efficiency from inefficient to efficient can be obtained as required. . The electrostatic precipitator has low resistance and low energy consumption allows operation in the range of 250-350 °C.
The electric dust removal equipment is huge and covers a large area. It requires operators to have a high technical level, high equipment investment, and no desulfurization effect.
Bag dust collector dust bag
Epichlorohydrin, 3-Chloro-1, 2 - epoxypropene, chloropropylene oxide ,ECH .
Molecular Formula: CH2OCHCH2Cl, C3H5OCl
Properties: It is a volatile, unstable colorless liquid with irritating odor similar to chloroform and ether. Molecular weight is 92.85, density, 1.1806g/cm3, boiling point, 116.11°C, freezing point, -57.2°C, refractive index (nd20), 1.4382, flash point (open cup), 40.6°C, and ignition point, 415°C. It is slightly soluble in water, miscible with many organic solvents, and able to generate azeotrope with a variety of organic liquids.
Main Applications:
Epichlorohydrin is an important organic industrial chemical and a chlorine-consuming product in fine chemicals, mainly for producing epoxy resin, synthetic glycerin, epichlorohydrin rubber, nitroglycerine explosives, glass fiber reinforced plastics, and electrical insulation products, which are widely used in the chemical industry, light industry, transportation, medicine, electronics and other fields. It also can be used as solvent for cellulose ester, resin, and cellulose ether, and the raw material of plasticizer, stabilizer, surfactant, and chloroprene rubber.
Toxicity and Protection: It is highly toxic, absorbed through the skin, and irritating to skin and mucous membranes. In higher concentrations, it has the function of narcotism. When poisoning occurs, there will be eye irritation, conjunctivitis, rhinitis, lacrimation, cough, fatigue, gastrointestinal disorders, nausea and other symptoms. Serious poisoning may lead to anesthesia or even lung, liver or kidney damages. Lethal concentration of human beings is 20ppm. Lethal dose of rat is 5090mg/kg. The maximum allowable concentration in air is 5ppm (18mg/m3). Production equipment needs to be closed, air, circulating, and the operator, wear protective equipment. In addition, due to intense auto polymerization, epichlorohydrin can not be heated in the fire in case of container burst. As for reaction as reagent, it is appropriate to be diluted with inert solvent and slowly added.
Packaging, Storage and Transport:
As ferric chloride or stannic chloride can promote auto polymerization, epichlorohydrin should be stored in dry, clean iron barrel, 200kg each, and kept in a cool, ventilated, and dry place, away from fire and heat. Store and transport in accordance with the provisions of flammable toxic substances.
EPICHLOROHYDRIN SPECIFICATION DATA SHEET
|
ITEMS |
GUARANTEED SPEC |
|
PURITY% (m/m)≥ |
99.9 |
|
DENSITY g/cm3 |
1.180-1.183 |
|
COLOR(pt-co)≤ |
10 |
|
MOISTURE%(m/m)≤ |
0.05 |
Epichlorohydrin (ECH)
Epichlorohydrin (Ech),Epichlorohydrin 106-89-8,99.9% Epichlorohydrin,High Quality Epichlorohydrin
Shandong Tiancheng Chemical Co., Ltd. , https://www.akdchemical.nl