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These 9 smoke control technologies will be phased out and banned throughout the industry! The reason for elimination is

Time：

2024-08-20

The Ministry of Ecology and Environment has released the "National Pollution Prevention and Control Technical Guidance Catalogue (2024, Restricted and Eliminated)", which will restrict inefficient dust removal and desulfurization technologies and uncontrolled system treatment technologies, and eliminate 9 flue gas treatment technologies such as positive pressure reverse suction bag dust removal.

In order to better play the role of technical guidance and promote equipment updates and technological progress in the field of ecological environment, the Ministry of Ecology and Environment recently issued a letter soliciting opinions on the draft of the National Pollution Prevention and Control Technical Guidance Catalogue (2024, Restricted and Eliminated Categories).

It is reported that in addition to some VOCs control technologies, the "Technical Guidance List" also includes 9 flue gas treatment (flue gas dust removal, desulfurization, denitrification) technologies such as positive pressure reverse suction bag filter, water spray desulfurization, electron beam desulfurization, and activated coke process with missing key components or process units, which may be phased out.

National Pollution Prevention and Control Technical Guidance Catalogue (2024, Restricted and Eliminated Categories) (Draft for Comments)

1、 Restricted category

Serial number

Technical name

Introduction to Process and Facilities

Reason for restriction

Limit application scope

Low efficiency wet dust removal technology

This technology is a dust removal and purification technology that uses single wet dust removal methods such as washing, water film (bath), and Wen mouth, as well as their combinations.

Low dust removal efficiency; Generate secondary pollutants such as sewage and sludge, which are highly corrosive to systems and equipment.

Only applicable to: (1) washing and purification of flammable and explosive gases; (2) Dust removal of high humidity and dew prone flue gas; (3) Pre dust removal.

Low efficiency dry dust removal technology

This technology utilizes mechanical forces such as gravity, inertia, and centrifugal force of particulate matter, and adopts dry dust removal technologies such as cyclone dust removal, multi tube dust removal, gravity settling, inertia dust removal, and their combinations for dust removal and purification.

Low dust removal efficiency.

Only applicable for pre dust removal.

Fiberglass wet electrostatic precipitator (fog)

The device is an electrostatic precipitator (fog) that uses electrostatic precipitator and water spray cleaning, and the anode plate is made of fiberglass material.

Fiberglass materials are flammable and pose high safety risks.

Only applicable for gas purification and dust removal.

Integrated technology of wet flue gas dust removal and desulfurization

This technology combines wet dust removal and wet desulfurization in one device, with no other dust removal facilities at the front and rear ends.

The dust removal efficiency is low, and the use of particulate matter alone makes it difficult to achieve stable and compliant emissions.

It cannot be used alone as a dust removal technology.

Facilities for desulfurization and denitrification that have not achieved automatic control

There is no control system or the control system has not achieved automatic adjustment and control of key parameters such as the current, dosage, and pH value of the desulfurization slurry in the desulfurization facility; Denitrification facilities without control systems or control systems that have not achieved automatic adjustment and control of key parameters such as current, flow rate, and liquid level of the denitration agent dosing pump.

We cannot guarantee the continuous and stable effectiveness of governance.

Cannot be used for new and expanded flue gas desulfurization and denitrification devices in the entire industry.

VOCs (volatile organic compounds) washing, absorption and purification technology

This technology uses clean water, acid solution, alkaline solution and other washing, absorption and purification methods to remove VOCs from industrial waste gas.

No purification effect on non water soluble VOCs.

Only applicable for the treatment of water-soluble VOCs.

Combustion, condensation, adsorption desorption, and absorption VOCs treatment technologies without control systems or control systems that do not achieve automatic adjustment and control of key parameters

VOCs treatment technology that does not automatically adjust and control key parameters such as auxiliary fuel consumption, combustion temperature, condensation temperature in the combustion process, adsorption bed adsorption and desorption time and temperature in the adsorption desorption process, and absorbent circulation in the absorption process.

We cannot guarantee the continuous and stable effectiveness of governance.

It cannot be used for the construction and expansion of VOCs treatment devices in the entire industry.

Note: Restricted technologies refer to technologies that can only be used in certain fields and conditions. This type of technology has problems such as low processing efficiency, poor operational stability, difficulty in treating secondary pollution, and low technical and economic efficiency. However, it is applicable in certain fields and conditions, and there is no suitable alternative technology available, so its application scope needs to be limited.

2、 Elimination category

Serial number	Technical name	Introduction to Process and Facilities	Reason for elimination	Not applicable scope
1	Positive pressure reverse suction bag dust removal technology	This technology is a bag filter dust removal technique that uses positive pressure filtration and reverse suction to clean dust, without an exhaust pipe, and directly discharges.	Easy to form unorganized emissions, weak ash cleaning ability, inability to achieve continuous monitoring, and insufficient emptying height.	Industry wide flue gas dust removal.
2	Water spray desulfurization technology	This technology uses water as an absorbent (without adding a desulfurizer) to absorb sulfur dioxide in the flue gas when in contact with it.	The absorption rate of sulfur dioxide by water is very low and unstable, and the absorbed sulfur dioxide is easily re precipitated due to the influence of flue gas temperature.	Industry wide flue gas desulfurization.
3	Electron beam desulfurization technology	This technology utilizes the plasma generated by an electron accelerator to oxidize sulfur oxides in flue gas, and the product reacts with the added ammonia gas to produce ammonium sulfate.	Low governance efficiency, high energy consumption, poor technical and economic efficiency, and inability to consistently meet standards.	Industry wide flue gas denitrification.
4	The desulfurization technology of spraying desulfurizer in the flue	This technology directly sprays gaseous, liquid, or solid desulfurizers in the flue gas to absorb and remove sulfur oxides from the flue gas, without a dedicated reactor.	Low desulfurization efficiency, unable to ensure stable and compliant operation; The by-products are difficult to handle.	Industry wide flue gas denitrification.
5	Wet desulfurization technology with missing key components or process units	Wet desulfurization technology without key components or process units such as pH meter, oxidation fan, desulfurization waste liquid and by-product treatment system installed, including: lime/limestone gypsum wet desulfurization without slurry density meter, dual alkali method without pH meter in desulfurization tower and regeneration tank, no by-product oxidation and extraction facilities outside the slurry circulation system, sodium alkali method without saturated wastewater treatment or by-product utilization device, ammonia desulfurization without evaporation crystallization recovery system, magnesium oxide method without magnesium oxide maturation system, magnesium sulfite oxidation system, evaporation crystallization system.	Unable to ensure stable and compliant operation, which can easily lead to the transfer and discharge of pollutants.	Industry wide flue gas denitrification.
6	Active coke process with missing key components or process units	Not equipped with a by-product preparation system or desulfurization analysis heating flue gas, by-product preparation system sulfur-containing tail gas, etc., before returning to the treatment facility in the front flue; Activated coke facilities without a reducing agent supply system.	Unable to ensure stable and compliant operation, which can easily lead to the transfer and discharge of pollutants.	Industry wide flue gas desulfurization and denitrification.
7	Technologies for desulfurization and denitrification that cannot evaluate the effectiveness of governance	The desulfurization and denitrification agent has unclear components and removal principles, making it impossible to verify and evaluate the pollutant removal effect through chemical agents or by-products.	It is difficult to accurately evaluate the desulfurization and denitrification effect and ensure stable and compliant operation.	Industry wide flue gas desulfurization and denitrification.
8	Oxidation denitrification technology without absorption device	Oxidation (including the addition of oxidation aids) denitrification technology without denitrification by-product absorption and treatment equipment.	Easy to cause concealed emissions and transfer emissions.	Industry wide flue gas denitrification.
9	Denitrification technology by spraying denitrification agents in the flue	This technology directly sprays denitrification agents in the flue gas to absorb and remove nitrogen oxides from the flue gas.	Low denitrification efficiency can easily lead to excessive ammonia escape concentration.	Industry wide flue gas denitrification.
10	VOCs (volatile organic compounds) photocatalysis and its combined purification technology	This technology utilizes photocatalysts such as titanium dioxide to activate and oxidize VOCs.	The photocatalytic reaction rate is slow and the products are unknown. When applied to VOCs treatment, the treatment efficiency is low and cannot meet the treatment requirements.	Organized VOCs emission control.
11	Low temperature plasma and its combined exhaust gas purification technology	This technology utilizes active species generated by gas molecules under the action of an electric field, including excited state molecules, electrons, ions, atoms, and free radicals, to degrade organic pollutant molecules in exhaust gas.	Most volatile organic compound molecules undergo incomplete degradation and mineralization in low-temperature plasma fields; At present, low-temperature plasma purification facilities generally have insufficient installed power, insufficient reaction time, and low processing efficiency; The decomposition products are unknown, and secondary pollutants such as ozone and nitrogen oxides are produced as by-products.	Industry wide VOCs control (excluding odor control).
12	Photolysis (photo oxidation) and its combined waste gas purification technology	This technology utilizes pollutant molecules to absorb short wavelength ultraviolet light, causing chemical bond breakage of pollutant molecules. At the same time, oxygen or water molecules in the exhaust gas absorb short wavelength ultraviolet light, producing active species including ozone and hydroxyl radicals that degrade and react with pollutant molecules.	The photoelectric conversion efficiency of photooxidation is low, and the effective radiation energy of the reaction device is generally insufficient; When applied to industrial waste gas treatment, the treatment efficiency is low; The reaction product is unknown.	Industry wide VOCs control (excluding odor control).
13	VOCs honeycomb activated carbon adsorption purification technology without in-situ regeneration system	This technology uses a honeycomb shaped activated carbon adsorption device to adsorb and purify VOCs, without an in-situ activated carbon regeneration system.	Saturated activated carbon is directly disposed of as hazardous waste. Honeycomb shaped activated carbon has low adsorption capacity and short effective use time, requiring frequent replacement; Honeycomb shaped activated carbon has low strength, is easily damaged, can be used once, and is difficult to regenerate and utilize in different locations.	VOCs management across the entire industry.

Note: Elimination technologies refer to technologies that are not usable in any field or under any conditions. This type of technology has problems such as unclear mechanisms, low processing efficiency, poor operational stability, uncontrollable secondary pollution, high material and energy consumption, and prominent safety issues. There are already more advanced alternative technologies that should be eliminated.