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![[Industrial Silicon (Renovation)] Yunnan Yongchang Silicon Industry Industrial Silicon Phase II Flue Gas Negative-Pressure Dust Removal System Project](/npublic/img/s.png "[Industrial Silicon (Renovation)] Yunnan Yongchang Silicon Industry Industrial Silicon Phase II Flue Gas Negative-Pressure Dust Removal System Project")
[Industrial Silicon (Renovation)] Yunnan Yongchang Silicon Industry Industrial Silicon Phase II Flue Gas Negative-Pressure Dust Removal System Project
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[Industrial Silicon (Renovation)] Yunnan Yongchang Silicon Industry Industrial Silicon Phase II Flue Gas Negative-Pressure Dust Removal System Project
[Project Background]
Yunnan Yongchang Silicon Industry Co., Ltd. is a state-owned key enterprise under Yunnan Provincial Energy Investment Group Co., Ltd., specializing in the production of industrial silicon. The company has long been a leading or participating entity in the drafting and revision of 18 national, industry, and association standards, including the National Quality Standard for Industrial Silicon, the National Standard on Energy Consumption Limits per Unit of Product for Industrial Silicon, and the Safety Production Code for the Industrial Silicon Industry. Furthermore, it has played a demonstrative and leading role in advancing industry technology in areas such as flue-gas desulfurization, waste-heat power generation, and production automation.
Against the backdrop of intensifying industry “involution” and increasingly stringent environmental regulations, companies are under pressure to both meet ever-tighter emission standards and control production costs while expanding profit margins. The conventional process of “waste heat recovery + baghouse dust collection + desulfurization” is no longer sufficient to simultaneously achieve ultra-low emissions and energy conservation and consumption reduction. Consequently, Yongchang Silicon Industry has partnered with Yitai Technology to upgrade and optimize the flue-gas treatment systems of its three existing industrial silicon electric furnaces. While keeping the furnace structures unchanged, the company has enhanced dust collection, denitrification, desulfurization, and waste-heat utilization processes to ensure compliance with emission limits while reducing costs and improving efficiency.
[Solution]
Yitai Technology has provided Yongchang Silicon Industry with a systematic “quality-improvement and renovation” solution, centered on its YT metal-membrane high-temperature dust removal and integrated dust–nitrate treatment technology, to reengineer the process flow:
Industrial silicon electric furnace → Primary heat recovery → YT high-temperature metal-membrane dust removal → Medium-to-high temperature denitrification → Secondary heat recovery → Wet desulfurization → Compliance emission 
“First high-temperature dust removal, then medium-to-high-temperature denitrification.”
After waste heat recovery, a high-temperature metal-membrane dust removal unit is installed to significantly reduce the particulate matter content in the flue gas before it enters the SCR denitrification reactor, thereby preventing fine silica powder from clogging the catalyst pores and ensuring both denitrification efficiency and operational stability.
High-Temperature Dust Removal with Metal Filter Bags as a Replacement for Traditional Fabric Bags
By employing YT high-temperature metal-membrane filter bags, which boast exceptional resistance to high temperatures and corrosion, low pressure drop, and superior filtration accuracy, stable ultra-low emissions can be achieved under high-temperature operating conditions, while simultaneously extending the service life of the dust-collection system and reducing the energy consumption associated with ash cleaning.
Synergistic Secondary Heat Recovery and Waste Heat Power Generation
By implementing a cascaded utilization scheme consisting of a primary waste heat boiler and a secondary waste heat boiler, the sensible heat of flue gas is recovered to the greatest extent possible while maintaining the optimal operating temperature of the environmental protection equipment, thereby increasing steam production and power generation capacity.
【Process Advantages】
Ultra-low Emissions and Stable Compliance
After dust removal using high-temperature metal membranes, the concentration of particulate emissions remains stably low over the long term, creating a “low-dust environment” for subsequent denitrification, preventing catalyst fouling, and ensuring denitrification efficiency.
By employing a combined process of high-temperature dust removal, medium-to-high temperature SCR denitrification, and wet desulfurization, synergistic control of PM, NOx, and SOx is achieved, with emission performance significantly exceeding the design assurance values.
Energy Conservation, Consumption Reduction, Quality Improvement, and Efficiency Enhancement
The two-stage waste heat recovery system fully utilizes the sensible heat in the flue gas, increasing steam-based power generation by approximately 25% compared with the pre-modification level, thereby significantly reducing external electricity procurement costs and transforming the “environmental island” from a cost center into a profit center. While maintaining the same electric furnace capacity, systematic optimization reduces energy and material losses carried away by the flue gas, enhances the silicon ore conversion rate, and delivers comprehensive benefits in the form of increased production, reduced consumption, and improved efficiency.
Flexible renovation with low implementation risk
The project makes full use of the existing electric furnaces and selected auxiliary facilities, leveraging a “quality-enhancement renovation” approach to upgrade the aging production lines to meet environmental protection standards. Low investment, short construction period, and minimal impact on production. , providing a replicable pathway for the green transformation of existing industry assets.
[Operational Data]
Based on the continuous operational data following the commissioning of the Phase II quality improvement and upgrading project for industrial silicon at Yongchang Silicon Industry, the key performance indicators are as follows:
- Dust emission concentration: <3 mg/Nm³
- Dust collector resistance: <1.5 kPa
- Nitrogen oxide (NOx) emission concentration: <50 mg/Nm³
- Sulfur dioxide (SO₂) emission concentration: <30 mg/Nm³
- Steam power generation: increased by approximately 25% compared with before the retrofit.
All of the aforementioned performance indicators exceed the design guarantee values, thereby achieving the objectives of “compliance on the first discharge and stable system operation.” While meeting environmental protection requirements, this has also significantly enhanced waste-heat-to-power generation revenues and overall economic benefits.
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