Overcoming Challenges and Pursuing Perfection | Xinjiang Agricultural Sixth Division’s 300,000-ton/year Bingzhun Carbon Calcination Flue Gas Purification Project Successfully Passes Acceptance Test

Overcoming Challenges and Pursuing Perfection | Xinjiang Agricultural Sixth Division’s 300,000-ton/year Bingzhun Carbon Calcination Flue Gas Purification Project Successfully Passes Acceptance Test

Recently, the 300,000-ton-per-year Bingzhun carbon calcination flue gas purification system project in Xinjiang’s Sixth Agricultural Division—constructed by our company—has successfully completed all performance tests after meticulous design, rigorous manufacturing, and standardized installation and commissioning. The project has smoothly passed the completion acceptance on the first attempt and has now been officially put into operation.

Project Overview 
The calcination workshop of the 300,000-ton-per-year anode project in the Jungdong Industrial Park of the Xinjiang Agricultural Sixth Division Carbon Co., Ltd. – Bingtuan is equipped with four calcination furnaces, capable of producing 300 kt/a of calcined coke. The flue gas purification system configured for this project can simultaneously treat the flue gas from all four tank-type furnaces in the calcination workshop, ensuring that the emissions meet the prescribed standards. After undergoing SNCR denitration, the calcination flue gas is cooled down through a waste heat boiler’s superheater and evaporator before entering the SCR denitrification unit. It then passes through an economizer and is conveyed by an induced draft fan into a wet desulfurization system, where SO₂ is removed from the flue gas. Finally, the purified flue gas enters a wet electrostatic precipitator to remove particulate matter such as dust. The treated flue gas is then discharged into the atmosphere via a chimney. 
The project adopts an advanced combined process featuring “SNCR-SCR denitrification + calcium carbide slag-gypsum desulfurization + wet electrostatic precipitator,” with a designed flue gas treatment capacity of up to 280,000 Nm³/h. In response to the challenging climatic conditions in Xinjiang—characterized by severe cold (with extreme low temperatures as low as -40℃), dryness, and frequent winds—the project team from our company conducted targeted design efforts to ensure the system operates safely, stably, and efficiently throughout the year. 
Emission standards for pollutants: sulfur dioxide content less than 35 mg/Nm³, NOx content less than 50 mg/Nm³, and particulate matter content less than 5 mg/Nm³.

Core Process and Performance Assurance 
01
The flue gas generated from the calcination furnace has a temperature of approximately 800–1,000℃. It is cooled down to 180℃ by a heat-transfer oil furnace or a waste-heat boiler. The cooled flue gas is then drawn into the desulfurization system via an induced draft fan and enters the absorption tower for the desulfurization reaction. Inside the absorption tower, the raw flue gas comes into full contact with the absorbent slurry, enabling the removal of SO₂. The flue gas temperature is reduced to around the saturation temperature of 55℃. At the outlet of the desulfurization unit, the SO₂ concentration is no higher than 35 mg/Nm³, and the treated flue gas is discharged directly into the atmosphere through the wet electrostatic precipitator’s top chimney. 02 
The denitrification system employs a coupled technology integrating SNCR (Selective Non-Catalytic Reduction) and SCR (Selective Catalytic Reduction), sharing a single ammonia solution storage system. At the inlet of the SCR denitrification unit, the NOx concentration is 200 mg/Nm³ (with 17% oxygen). Using an 18% ammonia solution as the reducing agent, the NOx removal efficiency of the denitrification unit shall be no less than 90%, ensuring that the NOx concentration at the outlet remains stably below 50 mg/Nm³ (with 9% oxygen). The ammonia slip rate shall not exceed 2.5 ppm. 03 
The dust removal system is equipped with a high-efficiency wet electrostatic precipitator, which adopts a bottom-in-top-out air intake configuration. The cleaned flue gas is discharged through a chimney located at the top of the wet electrostatic precipitator. After being purified and demisted in the desulfurization absorption tower, the flue gas enters the wet electrostatic precipitator to further remove fine mist droplets, gypsum, and fly ash. The purified flue gas is then discharged via the chimney, ensuring that the particulate matter concentration at the outlet is below 5 mg/Nm³. 04 
The entire intelligent electric control system adopts an integrated DCS control system. Through the DCS, functions such as monitoring and adjusting operating parameters, controlling equipment switching, performing system self-diagnosis, and providing alarm and protection are all realized, enabling “one-button start/stop automatic control” and achieving a high level of automation and intelligence. The automation design for this project is primarily guided by the principles of ensuring the safety, reliability, and cost-effectiveness of the plant. Based on practical feasibility, reliable equipment and technologies are selected to meet the requirements of various operating conditions and to guarantee the safe and efficient operation of the system.

Overcoming difficulties and demonstrating professional expertise.

Since the project’s launch, our company has attached great importance to it and assembled an elite team for project management, design, and construction. In the Xinjiang region, winter temperatures can plummet as low as -40℃, while summer temperatures can soar to 41.6℃—posing extremely high demands on the equipment’s weather resistance and freeze-proof insulation capabilities. From the design stage onward, our company has thoroughly taken into account these climatic characteristics, implementing enhanced insulation, heat tracing, and corrosion protection measures for critical equipment, pipelines, and instruments to ensure stable system operation under all climatic conditions. Despite numerous challenges—including complex interfaces (involving connections with waste-heat boilers, supplier-provided equipment, and other parties), tight construction schedules, and harsh on-site weather conditions—the project team fully leveraged its technical strengths and extensive engineering experience to successfully complete the project acceptance. 
With meticulous design and concerted collaboration, and strictly in accordance with the technical agreement and minutes from a series of meetings, we have clearly defined the detailed division of responsibilities between Party A and other suppliers, ensuring that the project scope is both comprehensive and free of overlaps. 
We strictly control quality and brand standards. All critical equipment and purchased components—such as spray layers, demisters, oxidation blowers, high-frequency power supplies, instrumentation, and valves—are sourced from well-known domestic and international brands specified in our agreements, ensuring top-notch equipment quality and system reliability right from the very beginning. 
With scientific construction practices and precise commissioning, the team overcame the challenges of winter construction and rigorously implemented on-site management of safety, quality, and schedule. During the commissioning phase, the team worked around the clock, meticulously optimizing various operational parameters to ensure that the entire system was successfully commissioned in one go. All performance indicators met or exceeded the design specifications.

Cooperation and win-win outcomes—setting a benchmark. 
The successful commissioning of the project not only helps improve the air quality in the region but also provides a replicable and scalable technical and engineering model for similar calcination flue gas treatment projects. After the system is put into operation, it will significantly reduce annual emissions of sulfur dioxide, nitrogen oxides, and particulate matter, yielding remarkable environmental benefits and fully complying with the national "Emission Standards for Pollutants from the Aluminum Industry" as well as ultra-low emission requirements. This fully demonstrates Ruilong Environmental Protection's technological expertise and engineering capabilities in the field of flue gas purification for non-electric industries. 
The successful acceptance of this project is the result of the sincere cooperation and joint efforts of all teams. Once again, Ruilong Environmental Protection has won the recognition and praise of its clients with its outstanding technical solutions, reliable engineering quality, and professional service ethos. The client highly praised the project's treatment effectiveness, operational stability, and level of intelligence. 
In the future, Ruilong Environmental Protection will continue to uphold the philosophy of "technological leadership, quality first, and customer supremacy," deeply cultivating the field of air pollution control. We will provide more industrial enterprises with efficient, cost-effective, and reliable environmental protection solutions, actively respond to the nation's "dual carbon" strategy, and contribute even greater efforts to promoting ecological civilization. On the path of environmental protection, we will forge ahead with determination and create even more outstanding achievements.

Ruilong Group was founded in 2006. 
We have now obtained various industry certifications and specialize in comprehensive EPC projects encompassing flue gas dust removal, desulfurization and denitrification, energy conservation, and low-carbon solutions. We also excel in the R&D and production of high-end filtration materials as well as intelligent operation and maintenance services. With a professional team dedicated to atmospheric pollution control research and development, we offer integrated services spanning design, construction, and operation & maintenance. We are widely recognized by our clients as a trustworthy supplier.