There are three common methods for chemical plants to deal with organic waste gas. The waste gas discharged by the chemical plant is related to the products it produces and has characteristics. General waste gas contains sulfur dioxide. The use of fluoride containing products and the production of hydrogen fluoride will produce fluorine and its compounds, nitrogen oxides, particles, chromic acid fog, sulfuric acid fog, fluoride, chlorine, lead and its compounds, mercury and its compounds, cadmium and its compounds, beryllium and its compounds, nickel and its compounds, tin and its compounds, benzene, toluene, xylene, phenols, Ethanol, acrylonitrile, acrolein, cyanonitrile, methanol, aniline, chlorobenzene, nitrobenzene, vinyl chloride, phosgene, asphalt smoke, asbestos dust, non methane president.
All of these have obvious characteristics of professional products. Discard relevant products. When these pollutants exceed the quality standards for air emissions, they will have an impact on people. If these waste gases are to be treated, chemical plant organic waste gas treatment method will be generally adopted to treat this type of waste gas. Let's briefly introduce it:
1. Absorption method : In terms of the pollution of organic compounds such as the control of chemical waste gas, chemical absorption method is used more frequently, for example, water absorption method and naphthalene or o-xylene as raw materials to produce waste gas containing phthalic anhydride, maleic anhydride, benzoic acid, naphthoquinone, etc. when phthalic anhydride is produced; Use water and alkali solution to absorb the chlorohydrin method to treat the tail gas (acidic component) of the hypochlorite tower in the production of propylene oxide, and recover the propane. Use the alkali liquor circulation method to absorb the phenol containing waste gas in the production of phenol by sulfonation method, and then use the acidification absorption solution to recover the phenol; The tail gas containing formaldehyde was absorbed by water absorption method. In addition, alkali liquor is also used to absorb H2s in tail gas and HC1 and other pollutants with water in the production of pesticides and dyes. The main problem of this skill is to deal with corrosion of equipment;
2. Adsorption method : The adsorption method can be used to purify the waste gas containing solvent or organic matter discharged from chemical products such as coatings, paints, plastics, rubber, etc. Generally, activated carbon is used as the adsorbent. Activated carbon adsorption equipment is commonly used to purify the waste gas in the production of vinyl chloride and carbon tetrachloride, and is also widely used in the production of coatings, paints, painting and printing. The existing problem is that the regeneration skills of activated carbon are not perfect, the processing cost is high, and in some occupations, the market is affected because the quality of products resorbed is poor. Therefore, the activated carbon adsorption method is only applicable to the treatment of certain high concentration organic waste gas, and the recovered organic matter or solvent can be reused for production, making the treatment cost compensated;
3. Incineration method : Organic pollutants or malodorous substances in waste gas produced by organic chemical industry can be managed by direct incineration method or catalytic incineration method. It is required that the incineration must be thorough, or the central product formed in the incineration process may be more dangerous than the original pollutants. In order to make the incineration thorough, it is necessary to grasp the three important parameters of incineration time, temperature and turbulence. Torch or incinerator can be selected for direct incineration. The flare incineration method is used to treat the waste gas containing combustible materials. The calorific value of the waste gas should be above 925kJ/m3. The flare is an atmospheric pressure incinerator with low incineration power. If forced air incinerator similar to boiler or industrial furnace is used, the incineration effect is better than that of flare. Direct incineration is generally carried out at about 1000C, and the products thoroughly incinerated are C02, N2 and steam.
In organic waste gas, there are generally particles, paint mist, heavy metals, halogen compounds and other mixtures. Therefore, these mixtures should be strictly purified before the purification of organic waste gas, so as not to affect the subsequent purification. Pretreatment generally selects supporting purification equipment and accessories such as preprocessor, water curtain purifier, spray purifier, dust remover, high-efficiency dust remover, etc.
The vast majority of organic waste gases are flammable, explosive, toxic and harmful compounds, because such dangerous chemicals are particularly important to safety in the management of organic waste gas treatment engineering companies. Our design and production criteria: safety, followed by compliance. Without security, anything is meaningless.
The safety of organic waste gas treatment project consists of two major parts. First, the safety and reliability of the organic waste gas purification device itself; Second, the safety and reliability of organic waste gas purification system design. As long as one of the two has security problems, there must be security risks.
