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"Green manufacturing" grinding ecological sand stee

11
Issuing time:2019-06-17 16:11

At shagang new material co., LTD., the largest slag powder production base in China, workers are carefully inspecting water slag on the transportation belt.The water slag, which has just been transported from the blast furnace, can be turned into slag powder after further processing, the staff told China metallurgical daily.It is understood that the slag powder is not only used in domestic key projects, such as the construction of the shanghai-nantong railway project, but also exported to the united Arab emirates and other countries, producing significant economic benefits.In 2016, shagang slag powder sold for 730 million yuan.In August last year, 27 clients signed contracts with shagang for the purchase and sales of slag powder for 2017, with the order volume reaching 5.43 million tons.This is only a miniature of shagang's efforts to strengthen energy conservation and environmental protection, build ecological factories and develop circular economy.


"We have invested a large proportion of our infrastructure in energy conservation, environmental protection and other aspects. This is our social responsibility."Shagang group chairman shen wenrong told China metallurgical news.From shagang puts forward to carry out in the tenth five-year planning "construction quality base, build green steel city of the long-term development strategy, shagang around this goal vigorously implement the scientific and technological innovation, management innovation and mechanism innovation, speed up structural adjustment, promote energy conservation and emissions reduction, development of circular economy and the construction of resource base, and further enhance the comprehensive competitiveness of enterprise, achieve steady development under the new normal.


It is reported that shagang group made a profit of 5.051 billion yuan in 2016, of which nearly 20% came from circular economy."In the face of high consumption, how can we reduce energy consumption?Recycle."Gong sheng, executive director and President of shagang group, summed up shagang's concept and practice of energy saving and environmental protection in a word.To some extent, the main production links of shagang, such as sintering, ironmaking, steelmaking and rolling, have realized "green manufacturing".


Independent research and development of new technology tons of steel energy forefront


The comprehensive energy consumption index per ton of steel can best reflect the energy efficiency management level of a steel enterprise.According to the introduction, in 2016, shagang's comprehensive energy consumption per ton of steel reached 576 kilograms of standard coal, iron smelting process energy consumption reached 370 kilograms of standard coal per ton of iron, converter process energy consumption reached 30 kilograms of standard coal per ton of steel, ranking in the forefront of the national iron and steel industry.


Such achievements are attributed to shagang's practice of the enterprise development concept of "innovation-driven, energy saving and environmental protection first".According to the relevant national policies and requirements on energy conservation and environmental protection, shagang actively promotes the application of new energy conservation technologies, new processes and new equipment, implements the transformation of energy conservation and environmental protection technologies, and constantly improves the level of energy conservation in line with the actual innovation and development of enterprises.Shagang group since 2000, has developed the electric furnace energy-saving new technology of hot charging molten iron, molten iron a pack of ironmaking energy saving new steelmaking process, rolling billet hot charging hot delivery technology, multiple slit rolling of steel rolling technology and so on more than 150 new techniques, new technologies, energy conservation and emissions reduction, electric furnace hot charging molten iron new technology of energy saving and so on more than 20 national invention patent issued by the Patent Office.


In order to further reduce energy consumption, shagang launched 800 million yuan energy cost reduction campaign in May 2016. There are more than 100 projects in 12 categories, among which the cost reduction capacity of nitrogen, compressed air, natural gas and other gases reached 217 million yuan."After the implementation of these projects, we have reduced our total nitrogen consumption by 12 percent, reduced our compressed air consumption by 5 percent, and reduced our natural gas consumption to less than 520,000 cubic meters per month."Zhang xin, first deputy director of the environmental protection department, said, "up to now, we have an annual energy cost reduction capacity of nearly 700 million yuan."


Besides some technical renovation project implementation, shagang also by conducting medium energy management, the factory more than 20000 energy distribution points, 13 kinds of main energy medium for real-time monitoring, by early 2016, consumption quota, determine the research project, implementation plan using can, can use a number of measures, such as performance evaluation to shagang last year purchased energy costs was down more than 740 million yuan in 2015.


The recycling of secondary energy accounted for 60% of the spontaneous electricity


"You see, this is a consumption of blast furnace gas, which now produces 3.65 million cubic meters of blast furnace gas and the consumption of gas users is 3.65 million cubic meters.It shows that the gas has not been released and is being used effectively."Pointing to his computer, wu jun, an employee at the environmental protection department, explained to China metallurgical daily the operation of the newly upgraded energy management system.The new system, which was upgraded four years ago, is more comprehensive than the original energy system and can monitor the company's energy consumption in real time.


Go around the shagang factory at random, and everywhere you can see the thick pipes hovering above, the most striking of which is the gray pipe.Gray pipes are used to transport gas produced by blast furnaces, which are mainly used in steel rolling and thermal power plants to generate electricity, zhang said.These pipelines have a total length of more than 80 kilometers.


As early as many years ago, shagang invested 1.54 billion yuan to build a comprehensive utilization of resources thermal power plant, which has 4 steam generating sets of 50 mw and 4 high efficiency gas-steam combined cycle generating sets (CCPP) with a total installed capacity of 400 mw and an annual generating capacity of 3.2 billion KWH.In 2015, two 135-megawatt generating units were built and put into operation, further improving the self-generating capacity and reducing the annual electricity bill by 600 million yuan.


"Coal gas is the most secondary energy produced in steel production, not only blast furnace gas, but also coke oven gas and converter gas.The gas is the best energy source for steel production. It is economically profitable to recycle the gas."Zhang said.In 2016, shagang's annual spontaneous electricity capacity reached 5.73 billion KWH. If calculated according to 300g/KWH, it is equivalent to 1.72 million tons less standard coal.


In addition to gas power generation, shagang also makes full use of residual heat and pressure to generate electricity, generating more than 1.6 billion KWH annually."Now the company can meet 60 percent of its production consumption through self-generated electricity."Zhang said.In terms of electricity saving, shagang also has its own set of management methods."Peak power costs more than 1 yuan per KWH, while flat power costs about 0.6 yuan per KWH and valley power costs only about 0.3 yuan per KWH.Through management, we only use 28 percent of peak electricity in the month with the lowest usage, and 37 percent of valley electricity, a difference of 9 percentage points."In 2016, shagang reduced its electricity bill by 250 million yuan compared with 2015 only by implementing the "peak-valley power" management.


However, the water consumption of new tons of steel was greatly reduced


Sit the mill car of sha gang, can see the world the 3rd, the first big river of China -- -- the natural scenery of Yangtze river, the ship that carries all sorts of raw material or steel product is on the river shuttle ceaseless.Shagang is born near water, but it is hard to make use of water resources.


In order to reduce the consumption of new water, shagang invested in building 45 sets of industrial water recycling treatment system many years ago, with a total recycling capacity of 330,000 cubic meters per hour. At the same time, shagang adopted separate quality water supply, recovered and treated industrial wastewater, and reused it in the production workshop. At present, the reuse rate of industrial water reached 97.5%.


In 2008, shasteel invested in a new sewage treatment plant with a treatment capacity of 40,000 tons/day, which is used to treat industrial sewage such as phenolic cyanide wastewater from coking organic matter, washing water from gas, condensed water and the whole company's domestic sewage. After treatment, it is used as slag water for steelmaking and iron smelting.The industrial water reuse rate is close to 100%, which is at the advanced level of the national counterparts, and over 10 million cubic meters of new water is saved every year.If calculated according to the industrial water consumption of 3 yuan/ton, shagang can save more than 30 million yuan per year.


"Even though we are using the most water, there is still some water that meets the standard that needs to be discharged and we want to use that water as well."Zhang said.Driven by this idea, shagang invested 140 million yuan to build a reclaimed water treatment and reuse plant with a capacity of 150,000 tons/day in May 2016."The sewage treatment plant will treat the effluent from 45 sets of industrial water circulation treatment systems and rainwater from the drainage stations as supplementary water for industrial cooling water and continue to be used in iron making, steel making and other production processes.It is expected to be put into use by the end of march this year."Zhang xin told China metallurgical news.In addition, the reporter also learned that the reclaimed water treatment plant not only treats the reclaimed water inside shagang, but also helps to treat the industrial sewage and the tail water discharged by the sewage treatment plant in jinfeng area."This water can be used as cooling water for thermal power plants."Zhang xin continued.It is understood that after the project is put into use, the new water consumption of shagang tons of steel will be further reduced, from the original 3.2 tons to less than 2.5 tons.


In November 2016, shagang was awarded the title of "leading enterprise" of energy efficiency in the industrial field of jiangsu province in 2016. The energy consumption per unit product of blast furnace process was only 371.44 kg standard coal/ton, ranking the first in the province.The coal gas generated in the process of iron and steel production is used for power generation, industrial wastewater is recycled after treatment, and various solid wastes generated in the process of production are processed to form new available resources...Shagang is increasingly determined to build a "green steel city" on the road.


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