Standards for smoke emissions and equipment for smoke emission?
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Are there any standards for flue gas emissions? What equipment is used for filtering the gases before they are released? It is said that bag filters can help meet the standards for flue gas emissions; I’m not sure if this is true. Are the standards the same across different industries, or do they vary from industry to industry?
Under China’s existing **emission standard system for air pollutants**, in accordance with the principle that comprehensive emission standards and industry-specific emission standards are not applied simultaneously, boilers are subject to GB13271‑91 \"Emission Standards for Air Pollutants from Boilers\", industrial furnaces are governed by GB9078‑1996 \"Emission Standards for Air Pollutants from Industrial Furnaces\", thermal power plants follow GB13223‑1996 \"Emission Standards for Air Pollutants from Thermal Power Plants\", coking ovens are regulated by GB16171‑1996 \"Emission Standards for Air Pollutants from Coking Ovens\", cement plants are subject to GB4915‑1996 \"Emission Standards for Air Pollutants from Cement Plants\". Emissions of malodorous substances are regulated by GB14554‑93 \"Emission Standards for Malodorous Pollutants\", automobile emissions are covered by GB14761.1–14761.7-93 \"Emission Standards for Air Pollutants from Automobiles\", and motorcycle exhaust emissions are regulated by GB14621‑93 \"Emission Standards for Exhaust Pollutants from Motorcycles\". All other types of air pollutant emissions are subject to the comprehensive emission standards for air pollutants. The use of equipment such as bag filters, cyclones, and electrostatic precipitators can only ensure that the dust levels meet the emission standards; other pollutants in the flue gas may not necessarily meet such standards. The specific requirements depend on the properties of the flue gas, the types and concentrations of pollutants, as well as the relevant emission standards
Bag filters can meet the requirements of industry standards
Depending on the equipment used for flue gas emission, different standards and dust removal devices apply.
As a supplement regarding the second floor: The conventional method involves water film dust removal. Of course, in addition to dust removal, some systems also require desulfurization and denitrification equipment. Desulfurization can be carried out either through dry or wet methods; the limestone-gypsum process mentioned on the third floor is currently the most widely used method. There are also other desulfurization methods such as those using magnesium oxide! ! !
The standard answers have already been given on the 2nd floor; it is generally very difficult to meet the standards with bag filters for dust collection
It should be easier to achieve with a bag filter, while it’s not so easy to achieve with electrostatic precipitators, right?
We manufacture incinerators, and it is also necessary to remove dust from the flue gases. Why then do the environmental protection authorities insist that bag filters must be used for this purpose during the inspection process?
We also need such a standard now
The person on the 2nd floor explained in more detail that the emission standards for smoke are determined based on the properties of the smoke, the types of pollutants present, and the characteristics of the industry. Enterprises can choose processing processes and equipment based on the standards they adhere to. Generally, bag filters have a higher dust removal efficiency than electrostatic precipitators, but they require stricter operating conditions and incur slightly higher operating costs.
I think most of them are bag filters
The actual operating cost is definitely higher for electrostatic precipitators, as they consume a lot of electricity. However, the cloth bags need to be replaced every 3 to 5 years, resulting in high maintenance costs.
Electrostatic dust removal alone may not be effective in some cases; wet electrostatic dust removal could be tried, but the investment required will be relatively high
The emission standards must meet the requirements of **the standards. Generally, flue gas needs to be desulfurized, decarburized, and denitrified. For desulfurization, the lime method or organic amine methods can be used; for decarburization, pressure swing adsorption, alcohol amine methods, low-temperature methane methods, etc., can be employed, as well as adsorption using activated carbon or molecular sieves. Denitrification is usually achieved through adsorption using modified molecular sieves or activated carbon.
It is recommended to use an electro-bag integrated dust removal system, which can meet the emission standards: pre-dust removal – electrostatic dust removal – bag dust removal