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1. Calculation formula for welding shielding gas flow rate
The calculation formula for welding shielding gas flow rate is: gas flow rate (L/min)=nozzle inner diameter (mm) × 3~51 Detailed explanation of calculation formula: Gas flow rate (L/min)=nozzle inner diameter (mm) × coefficient (3-5) - This formula is an empirical formula in the field of welding and is applicable to most conventional welding scenarios. -The coefficient selection depends on the specific process: generally, 3-4 is selected for welding, and 4-5 is selected for welding in windy or high current environments.
2. Key parameter description • Nozzle inner diameter: the actual internal diameter of the protective gas nozzle, with common specifications ranging from 10mm to 20mm. • Gas flow range: usually controlled at 10-25 L/min, exceeding 30 L/min can cause turbulence in the gas flow and reduce the protective effect Practical application precautions - When the environmental wind speed exceeds 2m/s, the flow rate should be increased by 20% -30% and a windproof cover should be installed. -The gas flow rate needs to increase with the increase of current and the fracturing of the rock mass: for every 100A increase in current, the flow rate needs to be increased by 2-3 L/min. -When using a mixed gas (such as Ar+20% CO ₂), the flow rate needs to be increased by about 15% compared to pure argon
5. Testing and adjustment standards - The optimal flow rate can be verified through trial welding: the ideal state of the weld is silver white without oxidation color, and if it turns blue, the flow rate is insufficient, and if it turns black, the airtightness needs to be checked. -It is recommended to use float flow meters or digital flow meters for
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2. What are the design specifications for denitrification spray guns
Core points of denitrification spray gun design specifications 1 Material selection • Sleeve/barrel: 316 or 310S stainless steel (temperature resistance above 800 ℃) • Nozzle: SUS3
10, Hastelloy alloy (high corrosion resistance requirements) • Key parameters: wear-resistant layer thickness ≥ 2mm, tensile strength ≥ 520MPa 2. Flow calculation • Formula: single gun flow rate=total ammonia demand/(number of spray guns x ammonia concentration) • Typical values: - Coal fired boiler: 3-8L/min · gun - Garbage incinerator: 5-12L/min · gun 3 Nozzle Configuration | Parameters | Options | Applicable Scenarios | | ------------------------------------------------------------------ | Atomization Form | Fan/Cone | Requirements for Uniformity of Smoke Distribution | | Spray Angle | 15 ° -120 ° (commonly 30 ° -60 °) | Small Angle Penetration/Large Angle Coverage | Atomization Particle Size | 50-200 μ m | The smaller the particle size, the faster the evaporation | 4 Installation specifications • Spacing
1.5-3 times the diameter of the spray cover • Angle: 15 ° -45 ° inclined (to avoid direct injection furnace wall) • Length: insertion depth ≥ 1/3 of the flue width 5 Environmental adaptability • Temperature resistance: Continuous operating temperature ≤ 1200 ℃ (short-term tolerance 1400 ℃) • Purging system: Compressed air pressure ≥ 0.5MPa • Anti blocking design: Built in self-cleaning channel 6 Performance verification