GB21257-2024

Norm of energy consumption per unit production of caustic soda, PVC, methane chloride

烧碱、聚氯乙烯树脂和甲烷氯化物单位产品能源消耗限额

GB 21257-2024 es una norma nacional china obligatoria vigente: Norm of energy consumption per unit production of caustic soda, PVC, methane chloride. Sector: Construcción. Enfoque: Eficiencia energética. Entrada en vigor: 1 may 2025.

La aplicabilidad depende del alcance del producto, la vía de certificación, los avisos de la autoridad competente y las reglas de transición. Solicite una traducción o verifique la fuente antes de usar esta ficha en una decisión de cumplimiento.

Resumen de cumplimiento

Este resumen está disponible por ahora solo en inglés.

Alcance y aplicabilidad

This standard applies to the calculation and assessment of energy consumption for production enterprises of caustic soda (via ion-exchange membrane electrolysis), polyvinyl chloride (PVC) resin, and methane chloride. It is also applicable for energy consumption control in new, reconstructed, and expanded projects within these industries. It does not apply to diaphragm process caustic soda production. The standard specifically targets dichloromethane and trichloromethane, excluding monochloromethane and carbon tetrachloride.

Requisitos técnicos

GB 21257-2024 establishes a three-tier energy consumption limit system for the specified chemical products, where Tier 1 represents the lowest energy consumption. For existing facilities, the energy consumption must meet the Tier 3 limits. New and expanded facilities must comply with the stricter Tier 2 requirements. The standard defines the statistical boundaries for production systems, auxiliary systems, and affiliated systems, detailing what is included and excluded in the energy calculation. It also specifies the treatment of recovered energy, externally supplied energy (like hydrogen), and energy-consuming working fluids. The calculation methods for comprehensive energy consumption per unit product are provided for each product category, considering different production processes such as calcium carbide, ethylene, and combined methods for PVC.

Métodos de ensayo

The standard outlines calculation methods rather than physical testing procedures. It requires the calculation of comprehensive energy consumption per unit product based on statistical data of energy inputs and outputs. The calculation involves converting various energy sources into kilograms of standard coal equivalent (kgce) using specified conversion factors. The standard provides detailed formulas for calculating the energy consumption of electrolysis units, processing units, and specific production processes for each chemical product.

Preguntas frecuentes

What products are regulated under GB 21257-2024?

The standard regulates energy consumption for caustic soda (ion-exchange membrane method), polyvinyl chloride (PVC) resin (various methods including calcium carbide and ethylene), and methane chloride (specifically dichloromethane and trichloromethane).

What are the key changes from the previous versions (GB 21257-2014 and GB 30527-2014)?

The 2024 version integrates the previous standards, introduces a three-tier energy consumption limit system, adds energy consumption limits for methane chloride, and updates the calculation methods and statistical scopes for caustic soda and PVC.

What is the difference between the requirements for existing and new facilities?

Existing facilities must comply with the Tier 3 energy consumption limits, while new, reconstructed, and expanded facilities must meet the more stringent Tier 2 limits.

The summary above provides a high-level overview of GB 21257-2024. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 21257-2024 today to access all detailed parameters, tables, and calculation procedures.

Indicaciones de aplicabilidad

Tipo: Gestión
CCS: F01
ICS: 27.010
Organismo competente: Standardization Administration of China
Comité técnico: National Technical Committee on Energy Fundamentals and Management of Standardization Administration of China

Relaciones

Sustituye a:GB 21257-2014, GB 30527-2014