Use a simple range hood to collect oil fume, and the oil fume is discharged to the outside through an exhaust fan. Only the collected oil fume is not purified, and the oil fume removal rate is 0%.
2, hookah cover
Using lye as detergent, the oil fume is purified by spraying and contacting with oil fume, and then collected and discharged by exhaust fan.
At present, the best oil fume removal rate is about 30 ~ 40%. The oil fume removal rate does not meet the requirements of GB 18483-200 1.
3, water spray washing tower purification process
After the hood is collected, it is sent to the absorption tower (spray, sieve plate and packing) for purification, and then discharged by the exhaust fan.
The oil fume removal rate of this product is about 80 ~ 90%. The oil fume removal rate meets the requirements of GB 18483-200 1. However, the equipment installation space is large and the system is complex.
4, high voltage electrostatic (plasma)
Dust particles are separated from gas by gas ionization and electric field force under high pressure.
The oil fume removal rate of this product is nominally 95%. The oil fume removal rate of 95% in the first week of product use meets the requirements of GB 18483-200 1. After continuous use for about 3 months, the removal rate linearly decreases to zero. If you need to ensure that the fume purification effect and fume removal rate meet the standard, you must clean it once every two weeks, and a professional electrostatic fume purifier cleaning service company will do it for you. The cost varies from 1000 to 5000 yuan each time. If it is not cleaned according to the specifications, the oil accumulation in the smoke exhaust pipeline is serious and the fire risk is great.
5. Physical filtration
One or more of wire mesh, activated carbon and steel wire are compounded.
The oil fume removal rate of this kind of products is actually 20 ~ 30%, which can not meet the requirements of GB 18483-200 1 when used alone. It is easy to block and needs to be cleaned every week.
6. Photocatalysis
The oil mist of oily gas is decomposed by ultraviolet light.
The oil fume removal rate of this product can reach 90%, which meets the requirements of GB 18483-200 1, provided that a pipeline of at least 30 meters is needed to facilitate the installation of ultraviolet lamps. At present, only imported ultraviolet lamps can guarantee the reliability and durability of products. The disadvantage is that ultraviolet light causes cancer, so it must be sealed tightly and cannot be leaked, which is not good for everyone. By the way, a little leakage can be sterilized.
7. Biological purification
Oil mist in oil fume is decomposed and purified by oil-loving microorganisms.
The oil fume removal rate of this product can reach 90%, which meets the requirements of GB 18483-200 1. Special microbial pool is needed, and microbial metabolism needs to be treated and updated regularly. This treatment is the most environmentally friendly.
8, liquid foam washing
Using the theory of mass transfer and double membrane, the combination of physical and chemical methods, the product of electromechanical integration, strictly speaking, should not be called lampblack purifier, but lampblack purifier is more reasonable.
The oil fume removal rate of this product can reach 90%, which meets the requirements of GB 18483-200 1. Using special purifying agent to improve the mass transfer ability of double membrane between gas and liquid phase can quickly capture soot and other particles in gas phase; At the same time, the negative pressure of its own exhaust fan is used to generate a liquid foam layer with a thickness of about 600mm (the size and diameter of liquid foam are 1.5mm) to wash and purify the oil fume gas. The purification effect is equivalent to the natural rainfall layer of 600 meters. The removal rate of oil in oil fume is 90%, the removal rate of black smoke particles is 90%, the removal rate of impurities such as dust in the air is 90%, the removal rate of various odors is 70%, and the removal rate of blue smoke (chemical gel) is 60%. The product needs to be drained every 2 ~ 3 days and professional purifying agent should be added. This product is stable in operation, long in service life and super fireproof.
Comparison of oil fume purification processes
1, hood+scrubber process
2. Range hood+electrostatic process
3, mixed water cover+electrostatic+activated carbon process
4. Smoke hood+photocatalytic purification
5, liquid foam washing
Comparison of oil fume purification schemes
For oil fume purification, there are mechanical separation, catalytic combustion, activated carbon adsorption, fabric filtration, wet treatment and electrostatic treatment in the market at present.
1, mechanical separation method
Use inertial collision principle or cyclone separation principle to separate oil fume.
Disadvantages: the baffle screen is easy to break, and it is directly discarded and discharged; Need regular maintenance; The vertical angle of installation shall be less than15; The purification efficiency is not high, and it is only suitable for pretreatment or occasions where the purification efficiency is not high.
2. Catalyst combustion method
The principle of combustion purification method is to use the heat generated by high-temperature combustion to carry out oxidation reaction, so as to convert pollutants in oil fume exhaust gas into substances such as CO2 and H2O, so as to achieve the purpose of purification. In the combustion process, the fume exhaust gas passes through the self-purification catalyst, and the catalytic reaction of the catalyst is beneficial to the transformation of pollutants. Generally, ceramic or metal honeycomb is used as the carrier of oxidation catalysis. This kind of oil fume purification equipment is only suitable for occasions with low oil fume concentration, such as raw food or making semi-finished products.
Disadvantages: The development of catalytic combustion E799BE5BAA6E79FA5E98193E58685EB9313337396166 combustion purification equipment is not very mature.
3. Activated carbon adsorption method
Use granular activated carbon or activated carbon fiber felt to adsorb pollutant particles in oil fume. The characteristics of this equipment are similar to those of filtration and purification equipment, but the effect of removing odor molecules in oil fume is better.
Main disadvantages: high cost of activated carbon.
4. Fabric filtration method
Flue gas and waste gas first pass through a certain number of metal grids, and large particle pollutants are intercepted; Then, after passing through a filter material such as a fiber mat, the particles are removed due to diffusion and interception. The commonly used filter material is polymer composite material with high oil absorption performance. This equipment has the advantages of low investment, low operating cost, no secondary pollution and convenient maintenance and management. However, there are some shortcomings, such as large resistance, large floor space and frequent replacement of filter media. The purification efficiency is generally 80~92%.
Disadvantages: Because of the large resistance of filter materials, for example, the pressure drop of the purifier using glass fiber filter materials can reach 1500Pa, and the filter materials need to be replaced frequently, so the application of filtration and purification equipment is limited.
5. Wet treatment method
Spray water or other detergent with a nozzle to form a water film, and use water mist to absorb oil fume. The oil fume particles contact with the water mist and water film sprayed by the nozzle, and flow downward with the water droplets through the inertial collision, retention, diffusion and mutual cohesion of the fine particles, so that the oil fume ions are separated from the air flow. The equipment has the advantages of simple structure, less investment, small floor space, low operating cost and convenient maintenance and management.
Disadvantages: large resistance, low purification rate of submicron particles, and secondary pollution of oily sewage.
The purification efficiency of v l mechanical separation and purification equipment is not high, and it is only suitable for pretreatment or occasions with low purification efficiency requirements;
The purification rate of sub-micron particles by wet washing and purification equipment is very low, and the generated washing liquid needs to be treated;
L filtration and purification equipment needs to purify and replace filter materials, which consumes a lot of energy; The cost of activated carbon adsorption purification equipment is too high;
The development of catalytic combustion purification equipment is not very mature;
L Electrostatic purification efficiency equipment has shown its advantages more and more because of its high purification efficiency, small pressure drop, stable operation and convenient maintenance and management, and its current market share is close to 90%.
6, electrostatic treatment method
Under the action of applied high voltage, electrons released from the surface or near the negative electrode wire quickly move to the positive electrode, colliding with gas molecules and ionizing. When the fume exhaust gas passes through this high-voltage electric field, the fume particles are charged in a very short time due to the collision and capture of gas ions, and move to the positive dust collection plate under the action of electric field force, thus achieving the separation effect. This kind of equipment has the advantages of less investment, less land occupation, no secondary pollution and low operating cost. Because it is easy to catch dust with smaller particle size, the purification efficiency is high, which can reach 85~95%. The difference between its purification mechanism and gas method is that the separation force is electrostatic force, which directly acts on particles instead of airflow, so it has the characteristics of low energy consumption and small resistance.
Electrostatic filter: When the gas containing dust particles passes through the high-voltage electric field formed between the cathode wire (also called corona electrode) connected to the high-voltage DC power supply and the grounded anode plate, the gas is ionized due to the corona discharge of the cathode. At this time, the negatively charged gas ions move to the anode plate under the action of electric field force, and collide with dust particles in the process of movement, and the dust particles are negatively charged, and the charged dust particles also move to the anode under the action of electric field force.
Technical advantages of high-voltage electrostatic equipment;
1. The treated air volume is large and the pressure loss is small. It can work in high humidity.
2. The single pass removal rate can meet the purification requirements.
3. The diameter range of particles effectively removed is very large.
Attached:
Generally speaking, the smoke generated by barbecue is not easy to handle, so it is necessary to control the smoke from the source. If the barbecue uses original charcoal, it will receive unexpected results. Primary charcoal will not produce green smoke or other cigarettes, and the baked food will be more meaty. In addition, the use of oil must be controlled during barbecue. Generally, barbecue does not need to be brushed with any oil, just a little bit is enough.