1 General Provisions
1.0.1 This code is formulated in order to improve the environmental protection design level of iron and steel industry construction projects, comprehensively implement "Environmental Protection Law of the People's Republic of China", "Law of the People’s Republic of China on Promotion of Cleaner Production", and relevant laws, regulations and policies (related to industrial pollution prevention and control, resource comprehensive utilization, energy conservation, water conservation, and iron and steel industry development policies), promote cleaner production, develop recycling economy, as well as protect and improve ecological environment quality.
1.0.2 This code is applicable to the environmental protection design in the construction, extension and renovation projects of iron and steel industry.
1.0.3 Environmental protection design of iron and steel industry must adhere to the principles of cleaner production and recycling economy, give priority to protection, rely mainly on prevention, as well as combine prevention and control. Pollution treatment shall be established in adopting advanced production technologies and technical equipments, as well as combined with resource comprehensive utilization, energy conservation and water conservation. Environmental protection design shall strictly control environmental pollution, reduce environmental risk, protect and improve ecological environment, as well as promote the sustainable development of economy, society and environment.
1.0.4 Not only the requirements stipulated in this code, but also those in the current relevant ones of the nation shall be complied with in the environmental protection design of iron and steel industry.
2 Terms
2.0.1 Primary dedusting of blast furnace
It is mainly used to treat the smoke and dust produced in such positions as tap hole, iron runner, slag runner, skimmer, swinging runner and hot metal bottle. These dust producing points are sealed and encapsulated, and then the flue gases are collected through partial air draft and purified.
2.0.2 Secondary dedusting of blast furnace
It is mainly used to treat the vast smoke and dust suddenly rushed out of the tap holes when opening and closing the tap holes. When the secondary dedusting is set, the casting house must adopt close-type peripheral structure, to prevent the cross flow interference appear in the house and ensure the effect of secondary dedusting.
2.0.3 Primary dedusting of electrical furnace
It is used to treat the dust particles in the flue gas produced in the process of melting and decarbonization of electric furnace.
2.0.4 Secondary dedusting of electrical furnace
It is used to treat the dust particles in the flue gas discharged and dissipated in the process of charging and tapping of electric furnace.
2.0.5 Secondary dedusting of converter
It is used to treat the flue gas produced in the process of tapping, charging and slagging of converter; the dust particles and fugitive dust in the flue gas produced in the process of cleaning the converter body and slag pot; the dust particles in the flue gas leaked from furnace mouth and smoke-collection system in the process of smelting.
2.0.6 Dust
Solid particles whose diameter is 1~100μm is called dust, which is produced due to exploitation, broken, screening, stacking, transportation or other mechanical treatment of ores and materials in the process of industrial production.
2.0.7 Coke dry quenching (CDQ)
It is the technology to cool down fiery coke in the closed system with inert gases.
2.0.8 Top gas pressure recovery turbine (TRT)
It is to drive the generator to generate electricity through turbine expansion power with the pressure energy of top gas.
2.0.9 Utilization of recycled water
It is the water utilization method to reuse directly or after proper treatment the used water in the same production process in the definite production system.
2.0.10 Cascade utilization of water
It is the water utilization method to cascade use water in the order of high quality to low quality according to different requirements for water quality of each procedure, workshop or range in the production process.
2.0.11 Direct cooling water
It is the cooling water that directly contact with the cooled equipments or media.
2.0.12 Recycle rate of water
Recycle rate of water is the ratio of the recycled water consumption to the total water consumption in the overall process of the production within a certain measuring time.
2.0.13 Effluvium
All gas materials that can irritate human olfactory organ, cause displeasure and damage living environment.
2.0.14 Greening rate
Greening rate is the index to reflect the green area conditions of the industrial plant area, and is the percentage of the total green area and the total plant area.
3 Basic Principles
3.0.1 The technological design of iron and steel production shall meet the principles of cleaner production and recycling economy, as well as implement the national "Iron and Steel Industry Development Policies". Nontoxic and harmless or low-toxin and low-harm raw materials, materials and fuels shall be adopted. New technologies, new processes and new facilities featured by feasible technology, rational economy, no pollution, little pollution, as well as no water consumption or little water consumption shall be adopted.
3.0.2 The principle to combine total amount and concentration control of pollutants shall be implemented to strictly control pollutant discharge amount and discharge concentration, as well as ensure the discharge pollutants come up to the standards. As for the construction, extension and renovation projects, the principles of "the new for the old", "total amount control" and "three simultaneous" shall be adhered to. The outdated production processes and equipments with severe pollution shall be eliminated. The prevention and control facilities for relevant old pollution sources with large pollution effect, necessary transformation and perfection shall be carried out.
3.0.3 As for the valuable renewable resources and secondary energy sources (such as waste gas, waste water, solid waste, combustible gas, excess heat and excess pressure) produced in the technology process, they shall be recycled with effective comprehensive utilization technology according to the principles of cleaner production and recycling economy, and shall meet the following provisions:
1 The factory shall adopt central heating.
2 Advanced and mature flue gas and dust purification treatment technologies shall be adopted; dry purification technology should be adopted to replace wet purification.
3 According to the quality grading water supply principle, technologies such as diffluence of clear water and sewage, utilization of recycled water and cascade utilization of water shall be adopted to improve the recycling rate of production water in each procedure as well as reduce quantity of water intake and waste water discharge. Under the conditions of recycling or cascade utilization of production waste water in each procedure, total drainage treatment facilities can be built to reuse the treated waste water as the industrial makeup water.
Corresponding waste water treatment facilities shall be installed for waste water treatment according to the different water quality and quantity. As for the waste water with toxic, harmful or corrosive materials, its production area, ditches and pipelines for transmission must adopt anti-leakage and anti-corrosion measures.
4 Solid waste (including waste liquid) must be treated to maximally recycle. Technical schemes with large utilization, local application ability, high product additional value and good economic benefit shall be adopted, and matched transportation, treatment, machining, and comprehensive utilization facilities shall be installed.
3.0.4 Storage, transportation and application of radioactive substances as well as treatment of radioactive wastes must meet the relevant requirements of the national current law "Law of the People's Republic of China on Prevention and Control of Radioactive Pollution" and the current national standard "Limit of Radionuclides in Building Materials" GB 6566.
3.0.5 In the environmental protection design of construction, extension and renovation projects of iron and steel industry, low-noise production process and equipments should be adopted, and the noise source shall be controlled. If the noise and vibration exceed relevant national and professional standards, sound insulation, noise elimination, sound absorption, vibration damping, damping or integrated control measures shall be adopted respectively according to the performance of noise and vibration.
3.0.6 Discharge of various pollutants (factors) produced in the construction projects must meet the requirements of the national current relevant pollutant (factor) discharge standards and relevant regulations. As for the areas without local pollutant discharge standard, relevant pollutant discharge standards confirmed by the national or local environmental protection departments shall be met. After the construction projects are established and put into production, the final discharge concentration and annual discharge amount of pollutants shall meet the requirements in the examination and approval opinions of the environmental protection departments to the construction projects. As for the introduced projects, the pollutant discharge standards of equipments and devices must not be lower than the national standards.
