Acid Gas Treatment Solutions
CO₂ (in acidic contexts)
H₂S
NOX
SO₂
HCl
Ever-power RTO – Experts in the Treatment of Acidic Gas
The thriving petrochemical and refining industries generate various acidic gases during processes such as desulfurization and waste treatment. If left untreated, these gases can lead to equipment corrosion and environmental problems. Ever-Power offers high-performance Regenerative Thermal Oxidizer (RTO) systems, integrated with pre-scrubbers, that efficiently oxidize these pollutants into harmless compounds while recovering heat for reuse.
What is Acidic Gases?
Acidic gases include compounds such as hydrogen sulfide (H2S), sulfur dioxide (SO2), nitrogen oxides (NOx), hydrochloric acid (HCl), hydrofluoric acid (HF), and in some cases, carbon dioxide (CO2). RTO systems can effectively treat H2S, SO2, and HCl through high-temperature oxidation, but upstream neutralization is often required to protect equipment. Sources of these gases include natural gas processing, refinery operations, chemical manufacturing, and combustion processes. They are characterized by their corrosive and toxic nature and can contribute to acid rain formation.
Specifically, acidic gases originate from various industrial activities. In refineries, H2S comes from hydrodesulfurization units used to remove sulfur from fuels. Chemical plants produce HCl during chlorination processes, while power plants generate SO2 through coal combustion. The composition of these gases varies: H2S is a colorless gas with a rotten egg smell; SO2 has a pungent odor and forms sulfuric acid in humid environments; and NOx contributes to smog. The table below summarizes the characteristics of these gases for a clearer understanding.
Major Sources of Acid Gas Emissions
| Gas Type | Bronnen | Components | Kenmerken |
|---|---|---|---|
| H2S | Refineries, natural gas processing, wastewater treatment | Hydrogen sulfide | Colorless, toxic, flammable, corrosive, low odor threshold (rotten eggs) |
| SO2 | Combustion of sulfur-containing fuels, metal smelting | Sulfur dioxide | Colorless, pungent, forms acid rain, highly soluble in water |
| NOx | High-temperature combustion in engines, boilers | Nitric oxide (NO), nitrogen dioxide (NO2) | Brownish gas (NO2), contributes to ozone formation, acidic when oxidized |
| HCl | Chemical manufacturing, incineration | Hydrochloric acid vapor | Colorless, highly corrosive, forms strong acid in moisture |
| HF | Aluminum production, semiconductor etching | Hydrofluoric acid | Colorless, extremely corrosive to glass and tissues, toxic |
| CO2 | Combustion, fermentation | Carbon dioxide | Colorless, odorless, forms carbonic acid in water, greenhouse gas |
Environmental Pollution
Causes acid rain (SO₂, NOx), damages ecosystems, and pollutes water and soil.
Human Health
Irritates the respiratory tract (HCl, HF), causes pulmonary edema (high concentrations of SO₂), and leads to chronic poisoning (H₂S).
Equipment Corrosion
Corrodes RTO ceramic heat exchangers, stainless steel casings, pipes, and fans, shortening equipment lifespan.
Regulatory Requirements for Acidic Gases
Singapore
- HCl ≤ 20 mg/m³
- HF ≤ 5 mg/m³
- SO2 ≤ 500 mg/m³
- stikstofoxide ≤ 100 mg/m³
Malaysia
- HCl 30 mg/m³
- SO2 350-700 mg/m³
- stikstofoxide Sector Specific
- Monitoring CEMS Required
China
- HCl 30–100 mg/m³
- HF 3–9 mg/m³
- SO2 35–400 mg/m³
- stikstofoxide Ultra-low trends
United States
- HCl ≤20 ppm (or 95%↓)
- HF NSPS Regulated
- SO2 Acid Rain Program
- stikstofoxide CSAPR Caps
European Union
- HCl < 10 mg/m³
- HF < 1 mg/m³
- SO2 < 50-200 mg/m³
- stikstofoxide BAT-AEL Standard
Japan
- HCl ≤ 20 mg/m³
- HF ≤ 5 mg/m³
- SOx Total Mass Control
- stikstofoxide Regional K-values
Our Core Technologies for Acid Treatment
- Ever-Power RTO systems shine in treating these gases, particularly H2S and SO2, by oxidizing them to SO3 or water vapor at temperatures above 800°C. For HCl and HF, pre-treatment scrubbers neutralize acids before oxidation to avoid ceramic bed damage. This integrated approach suits Singapore’s petrochemical hubs, where space con
- Essential components for Ever-Power RTO include transmission parts like rotary valves, ensuring smooth gas flow switching and made from Hastelloy for acid resistance. Easy consumables such as ceramic media beds absorb heat and require replacement every 5 years in corrosive environments. Important spare parts encompass burners for oxidation initiation and sensors for real-time acid gas monitoring, stocked in Singapore for quick Jurong deliveries.
How It Works (Process Summary)
2025 Case Studies: RTO for Acid Gas
Innovations in Singapore Petrochemical & Semiconductor Sectors
Implementation of an advanced RTO system to manage increased H2S loads. Includes caustic soda scrubbing as a pre-treatment to neutralize acid gases, preventing media clogging.
Customized RTO controls designed to stabilize fluctuating flows from batch manufacturing. Features high-precision pH monitoring and acid-resistant seals for 24/7 stability.
Specialized RTOs with fluoride-resistant linings for HF gases. Integrated AI predictive maintenance analyzes sensor data to forecast corrosion failures.
Hybrid RTOs with catalytic elements for low-temp NOx oxidation. Blockchain integration provides verifiable data for Singapore carbon tax compliance.
Ulsan, Korea: RTO+SCR integration reduced NOx by 98%.
Norway: RTOs achieve SO2 compliance under 50 mg/Nm³ per the Pollution Control Act.
| Onderdeel | Onderhoud | Freq |
|---|---|---|
| Scrubber Filters | Media inspection/replacement | Monthly |
| pH Sensors | Calibration for efficacy | Quarterly |
| Valve Gears | Lubrication and seal check | Quarterly |
| Recirc. Pumps | Redundancy check (N+1) | Cont. |
Redacteur: Miya
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