Latest standard for ultra-low emissions of lime kilns
With increasingly stringent environmental protection requirements, the ultra-low emission standards for lime kilns are constantly being upgraded. The Hebei Provincial Standard "Emission Standards for Air Pollutants in the Lime Industry" (DB 13/1641—2025), released in September 2025, will be implemented from January 1, 2026, providing a new basis for emission control of lime kilns.
The standard has tightened the emission limits for particulate matter, sulfur dioxide, and nitrogen oxides. The emission limits for particulate matter, sulfur dioxide, and nitrogen oxides for existing enterprises are 10mg/m³, 50mg/m³, and 150mg/m³, respectively. The emission limit for nitrogen oxides for newly established enterprises is 100mg/m³, and the emission limit for nitrogen oxides for existing enterprises will also be adjusted to 100mg/m³ from January 1, 2028. At the same time, the emission limits for ammonia and flue gas blackness from lime kilns have been increased, the requirements for unorganized emission control have been improved, the requirements for exhaust stack height and reference oxygen content have been revised, and new requirements for determining compliance with atmospheric pollutant standards have been added.
At the national level, the "Emission Standards for Air Pollutants from Lime and Calcium Carbide Industries" (GB 41618—2022) also holds significant guiding importance. Based on the analysis of pollution generation and discharge during the lime production process, it distinguishes between different production procedures or facilities, stipulates applicable organized emission limits, and adopts the format of "major pollutants + characteristic pollutants" to ensure strict emission supervision.
The upgrading of lime kilns to meet ultra-low emission standards will drive technological advancements and the upgrading and renovation of environmental protection facilities in the industry. This will encourage enterprises to adopt more efficient denitrification and desulfurization technologies, achieving energy conservation, emission reduction, and green development.
