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1、 Composition of exhaust gases from different industries:
(1) Air and exhaust gas purification in the fragrance workshop, makeup 2113 product workshop, and tableware workshop: methyl methacrylate, ethyl acetate, acetoacetic acid, ethyl ester, aldehydes, ammonia, trimethylamine, sulfurization atmosphere, methyl sulfide, methyl sulfide, dimethyl disulfide, etc;
(2) Purification of Air Waste Gas from Petrochemical Plants: Sulfur Dichloride, Oxygenates, Smoke, Benzopyrene, Non Methane Total Hydrocarbons, Sulfurization Atmosphere, Volatile Phenols, Amines, Hydrocarbons, Benzenes, Cyclohexane, Hydrogen, Ethylene, Tea Terminal, Butadiene, Propylene Terminal, Ethylene Oxide, etc
(3) Steel plant exhaust gas treatment, steel mill rolling gas treatment: sulfur dioxide, carbon dioxide, nitrous oxide, hydrogen fluoride, some volatile organic compounds, smoke and dust;
(4) Spray workshop exhaust gas purification, baking workshop exhaust gas purification, spray painting workshop air purification: benzene exhaust gas treatment, toluene exhaust gas treatment, trimethylbenzene exhaust gas treatment, TVOC exhaust gas treatment, paint mist particles, etc;
(5) Printing workshop exhaust gas purification: benzene exhaust gas treatment, toluene degree gas treatment, and benzene degree gas treatment; Butyl waxy acid, non methane total hydrocarbons, etc
(6) Biopharmaceutical waste gas purification, chemical plant waste gas purification: rubber, sulfide, acid-base gas, ethylene glycol, volatile organic solvents, etc
(7) Welding workshop exhaust gas purification: welding fumes such as carbon monoxide, carbon dioxide, sulfur dioxide, particulate matter, benzene organic matter, nitrogen oxides, odorous chlorine, etc;
(8) Furniture factory exhaust gas purification: benzene exhaust gas treatment, toluene exhaust gas treatment, xylene gas treatment, formaldehyde, etc;
(9) Cement plant exhaust gas purification: sulfur dioxide, nitric oxide, carbon dioxide, hydrofluoric acid, dust, etc;
(10) Power plant exhaust gas purification: sulfur dioxide, hydrogen dioxide, carbon monoxide, unburned hydrocarbons, particulate matter, dust, etc;
(11) Rubber factory exhaust gas purification: treatment of organic sulfides, benzene exhaust gas, toluene exhaust gas, xylene exhaust gas, organic gases containing toxic and harmful components such as phosphorus, phenols, ketones, alkanes, industrial dust, etc
(12) The processes that generate waste gas in the plastic industry are generally the hot melt workshop and the injection molding workshop. The processes that generate waste gas in the printing industry (such as resin, polyethylene waste gas, etc.) are generally: ink odors (such as benzene, alcohols, ethyl acetate, etc.) in the printing workshop
2、 The national emission standard for exhaust gas treatment is (Comprehensive Emission Standard of Air Pollutants GB16297-1996).
Five major factors in exhaust gas treatment:
1. It can effectively remove organic waste gases such as benzene, toluene, xylene, ethyl acetate, acetone, butanone, ethanol, acrylic acid, formaldehyde, as well as acid and alkali waste gases such as hydrogen sulfide, sulfur dioxide, and ammonia generated in factory workshops.
2. It depends on how the industry regulatory authorities recommend it.
3. It depends on the principle of exhaust gas treatment. There are currently many methods for treating exhaust gases, including activated carbon adsorption, high-temperature catalytic combustion, condensation, wet recovery, biological methods, and so on,
4. We need to look at successful cases. Most companies in the market have many successful cases.
5. It depends on the brand. Check whether the company's reputation and effectiveness in the industry match, and whether it has won high value titles such as Excellent Waste Gas Treatment Company recommended by Provincial and Ministerial level Environmental Protection Purification Associations, High tech Environmental Protection Company for Local Government Waste Gas Treatment, etc.
Additional Information:
This standard sets the following three indicators:
5.1 High allowable emission concentration of pollutants emitted through the exhaust pipe.
5.2 The pollutants emitted through the exhaust pipe shall be discharged at the high allowable emission rate specified by the height of the exhaust pipe.
Any exhaust pipe must comply with both of the above indicators simultaneously, and exceeding either of them is considered excessive emissions.
5.3 For pollutants emitted in an unorganized manner, establish monitoring points for unorganized emissions and corresponding monitoring concentration limits.
Classification of emission rate standards
The high allowable emission rate specified in this standard is divided into levels one, two, and three for existing pollution sources, and levels two and three for new pollution sources. According to the category of the environmental air quality functional zone where the pollution source is located, implement the corresponding level of emission rate standards, namely:
Pollution sources located in Class I areas shall comply with the first level standards (Class I areas prohibit new or expanded pollution sources, and Class I areas shall comply with the first level standards of existing pollution sources when renovating existing pollution sources);
Pollution sources located in Class II areas shall comply with Level II standards;
Pollution sources located in Class III areas shall comply with Level III standards.
3、 Regarding the currently mature and stable desulfurization and denitrification processes:
1. SNCR - Selective Non Catalytic Reduction Technology 2 SCR Selective Non Catalytic Reduction Technology 3 SNCR+SCR Joint Out of Sales Technology
4. Strong oxidation leads to unsold products
Comparison of various out of stock processes
There is a provision in the air pollutant emission standards of various industries that the measured emission concentration must be converted into the benchmark oxygen concentration. In other words, the performance assessment determines whether the emissions meet the standards based on the converted concentration.
Taking power plants as an example, the converted oxygen benchmark for the emission concentration of flue gas pollutants from coal-fired boilers is required to be 6% O2. The reason for such regulations is that after conversion, the emission values of pollutants can be standardized, making the values comparable.
In actual production, in order to achieve sufficient combustion, excess air (i.e. excess oxygen) is generally added, which creates a "dilution" effect, and the emission concentration of pollutants that are "diluted" will naturally decrease. In addition, when the amount of smoke is artificially increased, that is, the oxygen content is increased, the emission concentration of pollutants will also decrease. The use of converted values as evaluation criteria is to ensure that the emission concentration does not change due to changes in excess air values or human dilution.
Due to the different oxygen requirements of combustion processes in various industries, the prescribed oxygen standard is usually based on the emission concentration at the moment of full combustion, which is also the reason why oxygen standards vary among different industries.
With the tightening of environmental protection situation and the improvement of emission standards, the RTO (Regenerative Organic Waste Gas Oxidation Furnace), an effective measure for VOCs waste gas pollution prevention and control, is required to have an inlet waste gas concentration of less than 1/4LEL according to standard specifications during actual operation. Therefore, when encountering high inlet waste gas concentrations, fresh air needs to be supplemented for dilution to ensure the safe operation of the RTO oxidation process. Therefore, calculating the benchmark oxygen content according to current standards may be contradictory.
However, for the special process requirements of this industry, the Ministry of Ecology and Environment of China has provided an explanation that the combustion (incineration, oxidation) treatment of organic waste gas and whether the emission concentration is converted to the benchmark oxygen content need to be judged based on the situation. To ensure sufficient combustion and the need to supplement air (oxygen), the benchmark emission concentration of atmospheric pollutants with a measured concentration converted to a benchmark oxygen content of 3% should be used as the basis for determining compliance; If the oxygen content of the exhaust gas can meet the needs of its own combustion and oxidation reactions without the need for additional air (oxygen) supplementation, and the oxygen content of the exhaust gas at the outlet of the device is not higher than that of the inlet exhaust gas, then the measured mass concentration shall be used as the basis for determining compliance.
Environmental Protection Equipment
Thermal storage thermal oxidation equipment(RTO)
Regenerative catalytic combustion equipment (RCO)
Zeolite adsorption concentration rotary drum+three beds RTO
Zeolite adsorption concentration rotary drum+rotation RTO
Zeolite adsorption concentration rotary drum+three beds RCO
Zeolite adsorption concentration rotary drum+catalytic combustion (CO)
Online activated carbon adsorption concentration desorption+catalytic combustion(CO)
Offline activated carbon adsorption, concentration, desorption+catalytic combustion(CO)

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