Comparison of Common Methods and Common Methods of VOC Organic Waste Gas Treatment
TT exhaust gas treatment / (finishing)
Common methods for VOC organic waste gas treatment
In addition to the commonly used methods such as adsorption, absorption, catalytic combustion, and thermal combustion, there are also biological reagent spray methods. When using the purification method, the method of low cost, low energy consumption and no secondary pollution should be preferred according to the specific situation, and the harm should be made as far as possible, and the components and waste heat should be fully recycled. In most cases, the petrochemical industry uses condensation, absorption, direct combustion and other methods due to high exhaust gas concentration; coatings, printing and other industries use adsorption, catalytic combustion and other methods due to low exhaust concentration. At present, the principle of the newly introduced industrial waste gas treatment lamp is to use a special high-energy high-ozone UV ultraviolet light beam to irradiate the molecular bonds of the malodorous gas substance, and to crack the malodorous gas substance, for example, is a new development direction of green environmental protection. The organic waste gas treatment condensing recovery method directly introduces the organic waste gas into the condenser through adsorption, absorption, dissociation and separation, and can recover valuable organic matter. The method is applicable to the working conditions of high organic waste gas concentration, low temperature and small air volume, and needs to be attached. Refrigeration equipment is mainly used in the pharmaceutical and chemical industries, and is rarely used by printing companies.
The organic waste gas treatment absorption method generally adopts physical absorption, that is, the exhaust gas is introduced into the absorption liquid for purification, and the absorption liquid is saturated, and then heated, analyzed, and condensed and recovered; the method is applicable to the atmospheric quantity, low temperature, low concentration of exhaust gas, but needs to be equipped with heating. Analytical recovery device, large equipment and high investment. Activated carbon adsorption method is generally adopted: adsorption of exhaust gas by activated carbon, when the adsorption is saturated, the activated carbon is desorbed and regenerated, the exhaust gas is blown off, catalytically combusted, converted into harmless substance, and the activated carbon is continuously used. When the activated carbon is regenerated to a certain number of times, the adsorption capacity is significantly reduced, and it is necessary to regenerate or renew the activated carbon. Activated carbon is currently the most used method for treating organic waste gas, and has good adsorption performance for benzene-based waste gas, but has poor adsorption to hydrocarbon waste gas. The main disadvantage is that the operating cost is high and it is not suitable for the environment with high humidity. However, for the current market application, the adsorption of activated carbon is the most commonly used. Activated carbon is used up to: activated carbon granules and activated carbon fiber. The price of activated carbon granules is relatively cheap, but the effect is poor. Compared with activated carbon fiber, the price is relatively high, and the effect is better.
Organic Waste Gas Treatment Activated Carbon Fiber (ACF)
(1) The specific surface area is large and the effective adsorption amount is high. Since the surface area of ​​the same weight of fiber is nearly a hundred times that of the particles, the weight of the activated carbon fiber to be filled is very small, but the adsorption efficiency is very high, and the adsorption efficiency is 85 depending on the organic gas content of the treated exhaust gas and other physical properties. Between % and 98%, the multistage adsorption process can reach 99.99%, which is much higher than the highest adsorption rate of activated carbon particle adsorption method of 88%, and the volume and total weight are also small. (2) The adsorption and desorption processes are short and the speed is fast; the desorption and regeneration energy consumption is low. ACF adsorbs organic gases several times to several tens of times larger than granular activated carbon (GAC), and has good adsorption capacity for inorganic gases, and can maintain high adsorption desorption speed and long service life. If it is heated by steam for 6-10 minutes, it can be completely desorbed, and the heat resistance is good. In the inert gas, the high temperature is above 1000 °C, and the ignition point in the air is above 500 °C. (3) The shape is variable and easy to use. Since the activated carbon fiber can be made into a felt type, it is very convenient to replace and does not cause any harm to the human body. (4) It can produce special ACF with special performance according to the needs; it has good strength and will not cause secondary pollution. Organic waste gas treatment Direct combustion method uses auxiliary fuel such as gas or fuel to burn, and the mixed gas is heated to make harmful substances at high temperature. It is decomposed into harmless substances under the action; the method is simple in process and small in investment, and is suitable for high-concentration and small-volume exhaust gas, but has high requirements for safety technology and operation. The organic waste gas treatment catalytic combustion method converts the exhaust gas into a harmless and odorless carbon dioxide and water by catalytic combustion; the method has low light-off temperature, high energy saving, high purification rate, convenient operation, small floor space and large investment, and is suitable for High temperature or high concentration of organic waste gas.
Organic waste gas treatment adsorption method (1) Direct adsorption method: organic waste gas is adsorbed by activated carbon, which can reach more than 95% purification rate. The equipment is simple and the investment is small, but the activated carbon is replaced frequently, which increases the loading, unloading, transportation and replacement work procedures. Operating costs have increased. (2) Adsorption-recovery method: the organic waste gas is adsorbed by the fibrous activated carbon, and is degassed by backflushing with superheated steam after being nearly saturated; this method requires providing the necessary amount of steam. (3) New adsorption-catalytic combustion method: This method combines the advantages of adsorption method and catalytic combustion method, adopts new adsorption material (honeycomb activated carbon) adsorption, introduces hot air near drinking and then desorbs, analyzes and desorbs The exhaust gas is introduced into the catalytic combustion bed for flameless combustion, which is thoroughly purified, and the hot gas is recycled in the system, thereby greatly reducing energy consumption. The method has the characteristics of stable and reliable operation, low investment, low operating cost and convenient maintenance. It is suitable for high air volume and low concentration of exhaust gas treatment. It is a mature and practical method for domestic treatment of organic waste gas.
Activated carbon suction tower UV cold combustion deodorization equipment Swirl exhaust gas purification tower
Organic waste gas treatment UV lamp UV photolysis
The industrial waste gas treatment lamp of Shanxi TT Waste Gas Treatment Center is made of high-precision and high-ozone quartz pipe. The principle is to use special high-energy high-ozone UV ultraviolet light beam to irradiate the molecular bonds of malodorous gas substances, and to crack malodorous gas substances such as ammonia, trimethylamine and sulfurization. Hydrogen, methyl sulfide, methyl mercaptan, methyl sulfide, dimethyl disulfide, carbon disulfide and styrene, sulfide H2S, VOC, benzene, toluene, xylene molecular bonds, in the free state of the pollutant atom and Ozone is oxidized and polymerized into small molecules that are harmless or less harmful, such as CO2 and H2O. The utility model has the advantages of small volume, convenient management, good treatment effect, low operation cost and sterilization and disinfection. The industrial waste gas treatment lamp of Shanxi TT Waste Gas Treatment Center has formed the core product of the series of odorous and odorous waste gas treatment equipment in indoor, industrial workshops, poultry farms, etc. It is a new development direction of green environmental protection, and more and more environmental protection companies are in it. Used in environmental protection projects.
Description of 13 kinds of waste gas treatment methods and their scope of application and advantages and disadvantages
Deodorization method | Deodorization principle | Scope of application | advantage | Disadvantage |
1. Masking method | Use a stronger aroma and odor blend to mask the odor so that it can be received | Applicable to the occasions that need to immediately and temporarily eliminate the effects of low-concentration malodorous gases, the odor intensity is about 2.5, and the unorganized emission source | Can eliminate stench effects as quickly as possible, flexibility and low cost | The malodorous ingredients have not been removed |
2, dilution diffusion method | Discharge odorous gas through the chimney to the atmosphere, or dilute with odorless air to reduce the concentration of malodorous substances to reduce odor | Suitable for treating medium and low concentrations of organized emissions of malodorous gases | Low cost Simple equipment | Vulnerable to meteorological conditions, odorous substances still exist |
3. Thermal combustion method | The odorous substance is thoroughly mixed with the fuel gas at a high temperature to achieve complete combustion. | Suitable for handling high concentration, low gas flammable gases | High purification efficiency, odorous substances are completely oxidized and decomposed | The equipment is easy to corrode, consumes fuel, has high processing cost, and is easy to form secondary pollution. |
4. Catalytic combustion method | ||||
5, water absorption method | The use of certain substances in the odor is easily soluble in water, so that the odor component is directly in contact with water, thereby dissolving in the water to achieve the purpose of deodorization. | Odorous gas from water-soluble, organized sources | Simple process, convenient management and low operating cost of equipment | Secondary pollution occurs, the washing liquid needs to be treated; the purification efficiency is low, and it should be used in combination with other technologies, and the treatment effect on mercaptan and fatty acid is poor. |
6, liquid absorption method | The use of certain substances and liquids in the odor to produce chemical reactions to remove certain odor components | Suitable for treating odors of atmospheric and high school concentrations | Ability to target certain odor components, the process is more mature | The purification efficiency is not high, the absorbent is consumed, and it is easy to form and secondary pollution |
7. Adsorption method | Using the adsorption function of the adsorbent to transfer the malodorous substance from the gas phase to the solid phase | Suitable for treating low-concentration, high-purification odorous gases | High purification efficiency, can handle multi-component malodorous gases | The adsorbent is expensive and the regeneration is difficult, requiring the odorous gas to be treated to have a lower temperature and dust content. |
8. Biofilter type deodorization method | After the pre-treatment process such as dust removal, humidification or cooling, the malodorous gas passes through the filter bed composed of the filter material from the bottom of the filter bed, and the malodorous gas is transferred from the gas phase to the water-microorganism mixed phase, and is fixed on the filter material. Decomposed by microbial metabolism | At present, the most research, the most mature technology, and the most commonly used biological deodorization method in practice. It can be subdivided into soil deodorization method, compost deodorization method, peat deodorization method and the like. | Low processing cost | The floor space is large, the packing needs to be replaced regularly, and the deodorization process is difficult to control. It is prone to problems after running for a period of time, and it is still difficult to deal with hydrophobic and difficult biodegradable substances. |
9, biological drip filter | The principle is similar to that of the biofilter, but the filter materials used are inert materials such as polypropylene pellets, ceramics, charcoal, plastics, etc. that do not provide nutrients. | Only microorganisms that degrade for certain malodorous substances adhere to the filler, and there is no case where the microbial population is mixed in the biofilter and the organic matter of the filter material is consumed. | The number of microorganisms in the pool is large, and it can withstand the pollution load larger than the biological filter. The inert filter material can be replaced without replacement, resulting in small pressure loss and easy control of operating conditions. | Nutrients need to be continuously added, and the operation is complicated, which limits their application. |
10. Washing activated sludge deodorization method | The malodorous substance and the mixed liquid containing the suspended solid slurry are sufficiently contacted to be removed from the odor in the absorber, and the washing liquid is sent to the reactor to degrade the dissolved malodorous substance by the metabolic activity of the suspended growth microorganism. | Have a larger scope of application | It can handle the odor of the atmosphere, and the operating conditions are easy to control, and the floor space is small. | High equipment costs, complex operation and the need to add nutrients |
11. Aeration-type activated sludge deodorization method | Dispersing the malodorous substance into a mixed solution containing activated sludge in the form of aeration, and degrading the malodorous substance by the microorganism which grows by suspension | Wide range of applications, currently used in Japan for odor treatment in manure disposal sites and sewage treatment plants | After the activated sludge is domesticated, the removal rate of the malodorous component that does not exceed the ultimate load can reach 99.5% or more. | Due to the limitation of aeration intensity, the application of this method has certain limitations. |
12. Three-phase multi-media catalytic oxidation process | The reaction tower is filled with a special solid composite filler, and the filler is internally compounded with a multi-media catalyst. When the malodorous gas passes through the packing layer under the action of the induced draft fan, it is in full contact with the liquid phase compounding oxidant which is sprayed in a mist by a special nozzle on the surface of the solid phase packing, and under the catalysis of the multi-media catalyst, the malodorous gas The pollution factor in it is fully decomposed. | It has a wide range of application, especially for the treatment of atmospheric, medium and high concentrations of exhaust gas, and has a good removal rate for hydrophobic pollutants. | Small footprint, low investment, low operating cost; easy to manage, ready to use; impact load, not susceptible to pollutant concentration and temperature changes. | Need to consume a certain amount of medicament |
13, low temperature plasma technology | During dielectric barrier discharge, particles with extremely high chemical activity, such as electrons, ions, free radicals, and excited state molecules, are generated inside the plasma. The pollutants in the exhaust gas react with these active groups with higher energy, and finally are converted into substances such as CO2 and H2O, thereby purifying the exhaust gas. | Wide application range and high purification efficiency, especially suitable for multi-component malodorous gases that are difficult to handle by other methods, such as chemical and pharmaceutical industries. | The electron energy is high, and it can work with all the malodorous gas molecules; the running cost is low; the reaction is fast, the equipment starts and stops very quickly, and it is used as needed. | One-time investment is higher. |
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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