Since the beginning of this year, the efforts of the state to carry out energy conservation and environmental protection work have continued to increase. Governments at all levels have actively promoted the implementation of energy conservation and emission reduction laws and regulations, and organized the organization of energy conservation and emission reduction supervision and inspection. For example, the new "Environmental Protection Law" has been approved and will be implemented on January 1 next year; the revision of the "Air Pollution Prevention Law" will be accelerated, and some provinces (municipalities and autonomous regions) will introduce local air pollution prevention and control regulations; Deploy special inspections and put forward the work strategy of “indefinite time, no greeting, no listening, direct report to the scene, direct supervision, direct exposure”... It can be foreseen that environmental protection has become a “hard constraint” for the future survival and development of resource energy-consuming enterprises. The trend will not change. Fortunately, in recent years, steel companies have recognized the urgency of improving environmental protection, and have increased investment and implementation in energy conservation and environmental protection, and achieved remarkable results. In this issue, we report on the environmental protection measures of Baosteel, Hualing Xianggang and Anhui Changjiang Iron and Steel, in order to provide ideas for the green transformation of steel enterprises.
Baosteel's benchmarking, environmental protection, re-emergence
(Reporter Sun Yanjun reporter Feng Maofen) "The picturesque factory environment has subverted the image of traditional steel enterprises" "No matter whether it is factory appearance or environmental management, we are very shocked"... In April, Baosteel He Wenbo, general manager of Group Co., Ltd., Dai Zhihao, general manager of Baosteel Co., Ltd., and the main group of principals of steel manufacturing unit, energy and environmental protection department, Shanghai Baosteel Energy Conservation and Environmental Protection Technology Co., Ltd., are studying in Taigang Group and Hebei Iron and Steel Group Tang. When the environmental protection practices of steel companies such as Steel and Shougang Jingtang Company were carried out, they expressed such feelings in unison. As the “leader” of China's steel industry, Baosteel's environmental protection work has always been at the forefront of the industry. Its environmental management strategy not only promotes the transformation and development of its own green manufacturing, green products and green industries, but also serves as an example for learning inside and outside the industry. He Wenbo said that with the passage of time, some excellent practices of the brother companies made Baosteel feel the gap. Especially in the sense of mission and crisis of environmental protection, Baosteel needs to learn from the brothers and enterprises to solve the problems in the development of environmental protection. Environmental protection is an important foundation for the survival and development of the steel industry. How China's steel industry can be combined with the future, especially how urban steel mills can develop together with cities and how to strengthen energy conservation and emission reduction can all find answers from the practice of brother companies. Entering the brother company, Baosteel's delegation saw many excellent practices in environmental protection for steel companies. For example, Taigang has increased its efforts in environmental protection and transformation, and has taken the lead in integrating and innovating a number of advanced energy-saving technologies with world-class levels, such as coke oven flue gas desulfurization and de-cyanic acid production, stainless steel slag silicon fertilizer production line, and sintering flue gas. Activated carbon multi-pollutant treatment system, shaft furnace dust removal ash treatment system, blast furnace slag water waste heat recovery system, urban sewage treatment system, etc., have achieved harmonious development with the city; Tanggang through comprehensive elimination of backward, energy-saving renovation and plant greening The measures have realized the “zero collection” of new water and the “zero emission” of wastewater, and become a demonstration enterprise of circular economy; the large-scale environmental protection facilities put into use by Shougang Jingtang Company have accumulated late-stage advantages for the development of enterprises... He Wenbo demanded that Baosteel manufactures In terms of environmental protection, energy conservation and emission reduction, the unit should adhere to the eyes and broaden its horizons. Don't be tempted by the growth of economic indicators. We must face up to the gaps in environmental protection, pursuit and culture. Develop environmental action plans with high starting point and high standards. , clear goals, priorities and nodes, while forming short- and medium-term action plans Implement responsibility and accelerate progress. Xianggang's comprehensive treatment and emission reduction results (Reporter Hu Peisheng correspondent Huang Haiyan) The reporter recently learned that the 10 square meter shaft furnace flue gas desulfurization and heavy metal treatment project initiated by Hualing Xiangtan Iron and Steel Group in the first half of this year has completed the design of the project. It was put into operation at the end of this year and can reduce 2,000 tons of sulfur dioxide and 2.6 tons of heavy metals annually. In addition, the 180-square-meter sintering machine flue gas desulfurization and heavy metal treatment project, which began trial operation in April, is expected to reduce 4,000 tons of sulfur dioxide and 10 tons of heavy metals per year. "In the face of increasingly strict environmental regulations, Xianggang must strive for initiative and take the lead." Xianggang has a clear understanding of the urgency of improving environmental protection. It is reported that in the second half of the year, Xianggang will start the comprehensive dust control work of the steel-making converter plant, which is expected to reduce 1000 tons of smoke dust and 10.7 tons of heavy metals.
In terms of comprehensive prevention of water pollution control and heavy metal pollution control, in recent years, Xiangtan Steel invested more than 1 billion yuan to build new and reconstructed process facilities, and improved the practice according to the idea of “multiple use of water, cascade use, wastewater treatment and reuse”. Water treatment and recycling facilities for various processes such as iron, steel making and steel rolling have established a water recycling system at the process, plant level and company level, and implemented water-saving and emission reduction projects such as total dry quenching, coking wastewater reforming and reuse. .
In order to cure the pollution of coking wastewater to Xiangjiang River, in 2009, Xianggang eliminated the biological dephenolization system, using two-stage high-efficiency microbial treatment and high-efficiency oxidation flocculation advanced treatment process to make the wastewater reach the first-class discharge standard. In the second half of 2011, Xiangtan Iron and Steel Co., Ltd. implemented a coking wastewater reuse project and used it as a blast furnace slag replenishing water to achieve “zero discharge” of coking wastewater. According to data released by the Hunan Provincial Environmental Protection Department, in 2013, the water quality of the Xiangjiang River Basin reached the highest level in nearly 20 years, and the monitoring section compliance rate was 92.8%, much higher than the pre-2000 level of less than 70%. At the same time, Xianggang eliminated the backward wet quenching process and adopted the coke oven dry quenching and clean production process, which can save 5 million tons of water per year, eliminating the COD (chemical oxygen demand) and suspended solids produced by wet quenching. Phenol and cyanide wastewater pollution. At present, the Xiangtan Steel No. 4 blast furnace gas washing wet method has been under construction and will be put into operation in the third quarter of this year. According to statistics, compared with 2008, at present, Xianggang's tons of steel consumption of new water, COD emissions, ammonia nitrogen emissions, suspended solids emissions, tons of steel sulfur dioxide emissions, tons of steel comprehensive energy consumption decreased by 69.2%, 79.6%, 73.3%, 83.3%, 55.5%, 9.7%. Yangtze River Iron and Steel increased investment "Circulation" highlights Many newspapers (Reporter Yu Jin Zhang Lijun) During the May Day, villagers in Taibai Town, Dangtu County, Ma'anshan City, Anhui Province, boldly dried their clothes outside the house. In their words: "The nearby Anhui Yangtze River Iron and Steel Company has controlled the dust and protected the green mountains and green waters, eliminating the worries in our hearts." With the reputation of the villagers, Changjiang Iron and Steel won the first Anhui Province to increase resource output. The rate of advanced units and the 2013 Anhui Province energy-saving demonstration units and other titles.
Anhui Changjiang Iron and Steel Company is a local private enterprise reorganized by Maanshan Iron and Steel Co., Ltd. Due to insufficient environmental protection investment in the early stage, various harmful gases and dusts discharged by Changjiang Iron and Steel in the process of sintering, iron making and steel making are difficult to be effectively controlled, polluting nearby farmland ponds, and polluting villagers' small farmhouses.
In order to thoroughly carry out pollution remediation, the company accelerated the elimination of backward production capacity and industrial structure adjustment. It has successively dismantled 8 3 cubic meters pellet furnaces, 2 258 cubic meters blast furnaces, 2 35 square meters sintering machines, and 1 75 square meters. Sintering machines and other equipment with high energy consumption and heavy pollution reduce sulfur dioxide, nitrogen oxides and smoke dust emissions. After implementing the technological transformation, in order to take advantage of the new equipment, they strive to reduce the solid fuel ratio under the premise of ensuring the stable operation of the blast furnace, reduce the comprehensive coke ratio through fine operation, and carefully organize the production to avoid waste. At the same time as reducing the source, Changjiang Iron and Steel actively develops a circular economy and pursues the maximization of resource utilization. They introduced advanced technologies such as waste heat and pressure utilization, high-temperature and high-temperature coal injection oxygen-rich smelting, hot-packing heat transfer, continuous casting and rolling, and promoted the implementation of blast furnace residual pressure turbine power generation (TRT) technology and gas comprehensive utilization power generation project. Sintering machine flue gas desulfurization project and other projects. In August 2013, the company's total investment of 300 million yuan of gas comprehensive utilization power generation project was put into operation, generating more than 60,000 kWh per hour. After deducting its own electricity consumption, the project's annual power generation exceeds 400 million kWh, which effectively saves energy, reduces the comprehensive energy consumption per ton of steel, and reduces emissions of sulfur dioxide and nitrogen oxides. With the completion and commissioning of the No. 3 blast furnace in the new district, the No. 3 TRT generator set was put into operation. At present, the unit generates 7,500 kWh of electricity per hour and can generate 60 million kWh per year, equivalent to saving 7374 tons of standard coal per year. In addition, the company's newly invested sintering flue gas desulfurization project has greatly reduced the emission of sulfur dioxide and dust; after the completion of the sintering waste heat power generation and converter steam recycling project being built, it is expected to save 23,600 tons of standard coal per year. Editor: Song Yuxi Source: China Metallurgical News - China Steel News Network