特高硫煤SO2超低排放技术评估

以燃用特高硫煤的300 MW机组中应用的旋汇耦合脱硫除尘一体化技术为研究对象,对该类技术进行现场测试与评估。测试结果表明：燃煤硫分在5%左右时,脱硫系统的脱硫效率可稳定在99.70%~99.82%,SO₂排放质量浓度在23.4~30.8 mg/m³,能够满足SO₂超低排放小于35 mg/m³的要求;除尘效率在78.6%~87.8%,颗粒物排放质量浓度稳定在4.60~5.76 mg/m³,能够满足颗粒物超低排放浓度小于10 mg/m³的要求。与脱硫单塔双循环、双塔双循环系统技术改造方案相比,该类SO₂超低排放技术的改造与运行费用均有比较大的优势。

Assessment of Ultra-Low SO2 Emission Technology for Ultra-High Sulfur Coal

In this paper, the technology of single tower integrated desulphurization and dust removal purification, which has been applied in the 300 MW ultra-high sulfur coal firing power plant, is tested and evaluated. The test results are obtained using coals with 5% sulfur contents. It is observed from the testing data that the desulphurization efficiency of the system can be stabilized between 99.70% and 99.82% while the SO₂ emission concentrations are maintained between 23.4 mg/m³ and 30.8 mg/m³, which meets the ultra-low SO₂ emission requirement of less than 35 mg/m³. In addition, the dust removal efficiency ranges between 78.6%~87.8% with the particulate emission concentrations also stabilized between 4.60 mg/m³~5.76 mg/m³, which meets the ultra-low particulate matter emission requirement of less than 10 mg/m³. Compared with the single-tower double-cycle technology and the double-tower double-cycle technology, this technology is more cost-effective in the aspects of both retrofit constructions and operations.