|作者: pmo121784|发布时间: 2019-01-28|525 次浏览Source:|Author: pmo121784|Published: 2019-01-28|525 views分享到:|Share to:
At present, for domestic and international industrial waste gas treatment, organic waste gas treatment methods mainly include physical methods, chemical methods, biological methods, including adsorption, direct combustion, catalytic combustion, chemical oxidation, biological filter and other treatment methods
At present, for domestic and international industrial waste gas treatment, organic waste gas treatment methods mainly include physical methods, chemical methods, biological methods, including adsorption, direct combustion, catalytic combustion, chemical oxidation, biological filter and other treatment methods. Exhaust gas treatment processes mainly include: isolation, combustion, absorption, condensation, plasma low-temperature catalytic oxidation, and adsorption.
1. Exhaust gas treatment and isolation method: It is a special filter material that is placed in the exhaust gas discharge process and mechanically isolated to achieve the effect of exhaust gas treatment.
Advantages: High efficiency for mist rubber smoke, no technical requirements, and simple operation.
Disadvantages: Can not effectively remove organic matter, large wind resistance.
2. Exhaust gas treatment and combustion method: The organic waste gas is directly combusted by heating and high temperature to achieve the purpose of exhaust gas purification.
Advantages: high purification efficiency, up to 95%.
Disadvantages: A large amount of thermal energy is required, a large amount of energy is required to be consumed, and it is also easy to generate secondary pollution such as NOX at high temperatures.
3. Exhaust gas treatment and absorption method: The absorption fluid and the exhaust gas are brought into contact with each other, so that harmful substances in the exhaust gas are dissolved in the absorption fluid, so that the exhaust gas can be purified.The absorption solution is handled separately.
Advantages: small investment, low operating costs and simple operation.
Disadvantages: low treatment efficiency, instability, low purification efficiency, about 50%, difficult to meet relevant environmental protection requirements, suitable for low-concentration organic waste gas, secondary pollution.
4. Exhaust gas treatment condensation method: When the temperature is lower than the freezing point of the harmful substance through condensation, the gaseous harmful substance is converted into a liquid state and separated from the air for purification.
Advantages: stable operation and high purification efficiency.
Disadvantages: large investment, high requirements on the environment and operators, excessive energy consumption, and high operating costs.
5. Plasma low-temperature catalytic oxidation method: Plasma is the fourth state of matter except solid, liquid, and gaseous. It has electric neutrality and high conductivity in a macroscopic degree.The plasma contains a large number of active electrons, ions, excited particles and photons.As a result of these active particles colliding with gas molecules, a large number of strongly oxidizing free radicals O ·, OH ·, HO2 and highly oxidizing O3 are generated; organic molecules are collided by high-energy electrons, excited and broken by atoms to form small Fragment groups or atoms; O ·, OH ·, HO2, O3, etc. react with excited atoms, organic molecules, groups, free radicals, etc., and finally oxidatively degrade organic molecules to CO, CO2 and HO2.
Advantages: Wide applicability, suitable for processing low-concentration (<1 ~ 1000ppm>), highly toxic and highly odorous harmful gases, making up for the gaps that other technologies cannot handle.And the operation is simple.
Disadvantages: The separate low-temperature plasma technology still has its shortcomings when dealing with harmful gases, such as if the harmful gases cannot be completely and completely converted into harmless gases, there are many by-products; and a large amount of ozone is generated under oxygen plasma; Higher energy consumption; lower removal efficiency.
6, activated carbon adsorption device adsorption method: the use of porous activated carbon, silicon bath soil, anthracite and other molecular-level large surface residual energy, adsorption of organic gas molecules on its surface, and thus purification.
Advantages: high processing efficiency (up to 99% of activated carbon adsorption), wide application, simple operation, low investment cost, and relatively low operating cost.
Disadvantages: The system has a large loss of wind pressure, it is difficult to grasp the saturation point of the adsorbent, and the adsorbent capacity is limited.