Advancing the Comprehensive Governance of VOCs in the Light Industry: A Comprehensive Exploration of RTO Technology

February 17, 2025 at 10:44 AM EST

The light industry is a traditional and advantageous sector in China's national economy, playing a vital role in absorbing labor employment, resolving rural problems, and promoting economic development and social stability. Simultaneously, the light industry is also a key domain for pollution prevention, energy conservation, and carbon reduction.

The exhaust emissions from the light industry possess the characteristics of a large base and a diverse range of types. The country has successively released policy documents such as the "Action Plan for Reducing Volatile Organic Compounds in Key Industries", which specify the comprehensive rectification of VOCs in the light industry like printing, shoe-making, synthetic leather, ink, furniture, plastics, and paper. Hence, how to effectively achieve the prevention and control of VOCs pollution in the light industry is currently a highly concerned matter.

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Introduction to energy-saving technology

Energy saving approach 1: Selection of exhaust gas treatment methods

Purification method	key points	characteristics of exhaust gas	advantages and disadvantages
Combustion method	Burn off organic matter in exhaust gas as fuel or decompose it at high temperatures, with a temperature range of 600-1100	Medium to high concentration	High decomposition temperature, safe, and reliable
Catalytic combustion method	Under the action of an oxidation catalyst, it oxidizes into harmless substances, with a temperature range of 200-400	Low concentration, continuous exhaust	For flameless combustion, low temperature requirements, small restrictions on combustible component concentration and calorific value, but high catalyst price
Adsorption method	Absorbent for physical adsorption, normal atmospheric temperature	Low concentration	High purification efficiency, but adsorbent has adsorption capacity limitations, which can easily generate solid waste
Absorption method	Physical absorption, normal atmospheric temperature	Waste gas containing particulate matter	The properties of the absorbent itself are not ideal, and the regeneration treatment of the absorbent is not good
Condensation method	Using low temperature to cool the organic components to below the dew point for liquefaction recovery	High concentration	Require simple components, simple equipment and operation, but not cost-effective; Belonging to chemical equipment that requires inspection

According to the comparison in the above table, medium to high concentration exhaust gas can be treated by the combustion method, while low concentration exhaust gas can be treated by a combination of the adsorption method and the combustion method.

Energy saving approach 2: Performance comparison of different types of regenerative thermal oxidizers (RTOs)

RTO type	Two-bed RTO	Three-bed RTO	Rotary Valve RTO
Technology iteration	First generation	Second generation	Third generation
Numbers of regenerative chamber	2	3	12
Piping pressure fluctuation	±500Pa	±250Pa	±25Pa
Occupation of land( based on two-bed RTO)	100％	130％	65％
Weight( based on two-bed RTO)	100％	150％	80％
Comprehensive thermal efficiency	84％	92％	95％
Maximum purification efficiency	95%	99%	99.5%
Structure	4 valves	9 valves	1 valve
Maximum treating range	<1g	<5g	<10g
Thermal efficiency	90%	95%	97%
Valve switching times per year	350,000 times	520,000 times	/

After comparison, the rotary valve RTO has significant advantages in progressiveness, reliability, compliance, energy saving, economy and practicability. Therefore, the rotary valve RTO can be selected to treat medium and high concentration exhaust gas.

Energy saving approach 3: Selection of waste heat energy saving methods

The method of using waste heat	Temperature	Advantages and disadvantages
Hot water	≤70℃	Advantages: No need for inspection, atmospheric pressure equipment, stable heating. Disadvantage: The heating temperature range is small;
Thermal oil	≤220℃	Advantages: High heat capacity value, stable heating temperature; Disadvantage: High temperature and easy carbonization, requiring inspection
Steam	≤160℃, Pressure≤1mpa	Advantages: High heating temperature range, stable temperature control; Disadvantage: Inspection required
Hot wind	≤400℃	Advantages: Wide temperature range for heating, no need for inspection; Disadvantages: Temperature is difficult to control and fluctuates greatly.

The reuse of waste heat is crucial for customers to transform their environmental benefits from negative to positive. Customers need to choose their own heat reuse methods based on their own heat requirements, in order to maximize the recovery and utilization of combustion heat energy.

VOCs have a broad range of sources, multiple production processes, and are distributed in numerous production processes, mainly resulting in unorganized emissions. Taking industrial coating enterprises as an example, VOCs are emitted from various processes such as coating blending, coating process, leveling process, drying process, spraying equipment cleaning, and paint residue treatment.

Promote energy-saving and carbon reduction technologies, advocate green production methods, elevate the service targets of enterprises from narrow customers to the entire society, and achieve economic benefits guided by social benefits. While enhancing the core competitiveness of enterprises, it also promotes the improvement and leap of enterprise values."

Media Contact
Company Name: Xi'an Yangling Yurcent Environmental Technology Co., Ltd.
Email: Send Email
Country: China
Website: https://www.yurcentrto.com/

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Advancing the Comprehensive Governance of VOCs in the Light Industry: A Comprehensive Exploration of RTO Technology

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