High-temperature Dust Removal, Desulfurization, and DeNOx Project for Lithium Salt Kiln Exhaust in the Lithium Battery Industry
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Project Case Studies
Description
I. Customer Needs and Pain Points
Core Customer Needs: Achieve integrated, deep ultra-low emissions for dust, sulfur, and nitrogen oxides in lithium salt kiln flue gas; meet the new environmental control standards for the lithium battery industry; and ensure continuous, compliant production on lithium salt production lines.
Key Challenges:
Lithium salt kiln flue gas is consistently at high temperatures of 400°C, contains highly adhesive dust, and contains alkaline salts and corrosive components. Under traditional processes that perform denitrification before dust removal, catalysts are highly prone to clogging, alkali poisoning, and wear and tear. Denitrification efficiency fluctuates significantly, requiring high catalyst loading and frequent replacements.
Multiple pollutants—including dust, NOₓ, and SO₂—cannot simultaneously meet emission standards. Traditional standalone dust removal, denitrification, and desulfurization systems feature a fragmented layout that occupies a large footprint, with high pipeline resistance and significant fan energy consumption. Frequent replacement of catalysts and spare parts drives up operational and maintenance costs, thereby reducing corporate production profits.
II. Solution
Adopt Aiyipu’s proprietary lithium salt kiln high-temperature integrated dust, sulfur, and nitrogen oxide treatment solution, which employs a combined process of high-temperature metal filter bag dust removal + high-temperature SCR denitrification + wet desulfurization:
Optimized system-wide process parameters: High-temperature metal filter bags at the front end first intercept high-temperature, sticky dust, eliminating dust-induced clogging and corrosion of the high-temperature SCR catalyst at the source. The back end is equipped with high-temperature-specific SCR denitrification catalysts, suitable for flue gas conditions at 400°C.
The system modularly integrates the entire process—including dust removal, high-temperature SCR denitrification, and wet desulfurization—with a compact, integrated layout that minimizes footprint. No additional land is required, and the system is designed to handle the high-temperature, highly adhesive, and highly corrosive flue gas conditions typical of lithium salt kilns.
III. Post-Implementation Compliance Standards and Results
Upon commissioning, the project’s flue gas parameters fully meet the ultra-low emission control requirements of the lithium battery industry:
Inlet NOₓ concentration: 300 mg/Nm³; outlet NOₓ consistently controlled at ≤30 mg/Nm³; dust is deeply purified via metal filter bags, while wet desulfurization simultaneously controls SO₂, ensuring simultaneous compliance for multiple pollutants. The system operates stably over the long term, completely eliminating the risk of excessive emissions from lithium salt kiln exhaust gases, helping the enterprise successfully pass online environmental protection inspections, and achieving a green and low-carbon transformation and upgrading of lithium battery production.
IV. Optimization of Operating Costs
Compared to traditional split-type flue gas treatment processes, the project’s comprehensive O&M costs have been significantly reduced:
Upstream high-temperature dust removal protects the catalyst, reducing the loading volume of high-temperature SCR catalysts by over 60%, which substantially lowers catalyst procurement and periodic replacement costs;
Integrated optimization of system air resistance reduces induced draft fan energy consumption by 25%;
Total lifecycle operating costs (chemicals, energy consumption, and equipment wear) have decreased by 20%–30%, saving lithium battery manufacturers hundreds of thousands of yuan in annual O&M expenses.
V. Post-Installation Maintenance and Operational Advantages
The entire flue gas treatment system features a modular, streamlined design and is equipped with a remote online monitoring system, allowing real-time remote access to operational data across the entire dust removal, denitrification, and desulfurization processes. On-site inspections are required only 1–2 times per month, eliminating the need for a long-term on-site maintenance team.
The catalyst and equipment are constructed from high-temperature-resistant and wear-resistant materials, making them suitable for the lime kiln’s long-term low-temperature, high-dust operating conditions. The system achieves an availability rate of over 99%, with no frequent failures, significantly reducing maintenance labor requirements and ensuring that lime kiln production continuity remains unaffected.
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