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Environmental Engineering

Environmental Engineering

  A、Desulfurization technology 
  1.Wet desulfurization technology
  The company has mature wet desulfurization technologies of boiling, sintering, coking, carbon flue gas a limestone in terms of lime, magnesia, carbide slag and waste yellow mud.
  Desulfurization of power plants: we have successfully cooperated with more than 50 enterprise groups, including China National Grid, China Huaneng Group, China Huadian Corporation, China Datang Corporation, SDIC Power, Weiqiao Aluminum, Xinfa Power Group, Henan Mengdian, Shi Feng Group, the Jinluo Group, Zibo Thermal Power Group. Additionally, we produced construction desulfurization facilities for more than 100 sets of coal-fired units and thermal power boilers.
  Sintering desulphurization: the company has been successfully cooperating with over 500 steel enterprises, such as Shanghai Baosteel, Capital Steel, Jiuquan Iron and Steel, Shiheng Special Steel, Rizhao Steel, Jinan Iron and Steel, Laiwu Steel, Guofeng Iron and Steel, Ante Steel, Hanzhong Steel, Tianjin United Special Steel, Asian New Steel. The "SDPZ sintering flue gas desulphurization technology", whose independent intellectual property rights are owned by us, has been used for more than 100 sets of sintering machine and the construction of desulfurization facilities, including Rizhao Iron and Steel with 600m², Laiwu Iron and Steel with 450m²sintering desulfurization, and sintering desulfurization area has been accumulated up to 28000m², accounting for more than 28% of the national performance in terms of desulfurization area.
  2.SDA rotary spray semi-dry desulfurization technology
  The company has established and Ansteel Institute of strategic cooperation with Ansteel Institute, introducing the rotary spray semi-dry desulfurization technology which was brought into China in the 1970s by the Danish company after the research and development.
  As for the flue gas or exhaust gas with temperature higher than 120℃and sulfur dioxide concentration less than 1000mg / Nm³, as well as the sensitive emission area, the SDA desulfurization process can be adopted. Especially in the sintering flue gas, coking flue gas treatment projects, depending on the flue gas temperature, the desulfurization agent such as calcium oxide, sodium carbonate, sodium bicarbonate, etc. can be chosen.
  3.Activated carbon desulfurization and denitration technology
  The company has signed a strategic cooperation with TISCO (TAIYUAN IRON &STELL (GROUP) CO.LTD) and we have introduced activated carbon desulfurization, denitration, dust removal technology. The activated carbon removal layer desulfurization, denitration, and dust removal technology are the advanced technology of sintering flue gas treatment, which has many successful paradigms in the world. in the domestic the flue gas purification device of 450m ² sintering machine and 660m² sintering machine of Taigang were initially put into operation in 2010, then our nation has built sets of activated carbon sintering flue gas purification device.
  B、Denitration technology
  1.SCR selective catalytic reduction denitration technology
  SCR denitration process selectively reduce the nitrogen oxides in the flue gas into innocuous nitrogen and water by injecting reducing gas ammonia into the flue gas at 300-450 °C medium temperature conditions with the active catalyst of vanadium titanium / rare earth-based metal oxide, so as to achieve the purpose of reducing nitrogen oxides emission.
  2.Low temperature SCR denitration technology
  The conventional SCR denitration catalyst has a high activation temperature and the optimum working temperature of the catalyst unit is 300-400 °C. In coking, small and medium-sized boilers, glass furnaces, roaster and other industrial furnace exhaust gas treatment field, the exhaust gas temperature is between 120-300 ℃. In order to solve the SCR catalyst activity in the range of this temperature, the company and large catalyst manufacturers have developed low temperature catalyst, which has been used in coking, industrial kiln exhaust gas denitrification and other fields.
  C、Dust removal technology
  1.Dry electrostatic precipitator technology
  ESP is the essential supporting facilities for industrial flue gas dust control whose function is to remove the particulate matter in the flue gas to greatly reduce the amount of soot discharged into the atmosphere, which is important for reducing environmental pollution and improving air quality Green facilities.
  2.Electric bag dust collection technology
  At present, the dust emission requirements are getting stricter. With the reduction of sulfur content in coal, industrial soot resistance increased significantly, which has a great impact on the electrostatic precipitator dust collection capabilities. Bag-type dust wipers are not sensitive dust resistance or chemical composition and other parameters, which can be obtained a stable dust removal efficiency In a certain concentration range of imports and filtration speed.
  3.Wet electrostatic dust removal technology
  In 2011, our group took the lead in successfully applying the wet electrostatic precipitator technology to thermal power units and the deep purification of desulphurization flue gas in sintering machines. This breaks through a number of key technologies, which helps to realize the deep purification of many pollutants like wet flue gas desulfurization fine particles and acidic droplets. The company is now one of the three major suppliers of wet electrostatic precipitators in domestic.
  4.Collaborative dust removal technology
  In the furnace coal ash <15%, you can optimize the configuration of the wet desulfurization tower to complete the synergistic purification of dust by using low-temperature economizer or bag filter unit.
  Collaborative dust removal process foundation: It opens up all links of independent part of the purification. Taking multi-channel and continuous purification measures can achieve the goal of the removal of dust, so that the removal equipment at all levels can help to remove part of the dust in the process of removing the main pollutants.
  D、wet flue gas whitening technology
  The application of wet flue gas whitening technology can help to reduce emissions of flue gas soluble salts, sulfuric acid mist, organic matter and other condensable particles by reducing flue gas temperature and moisture content and collecting moisture from saturated steam in flue gas. Thus it contributes to achieving the goal of improving air quality. We identify economically viable technology routes based on the specific requirements of wet plumes, which specially include flue gas factory conditions, environmental meteorology, space, cold and heat sources. By adjusting the flue gas outlet point of state to avoid the saturation line with the atmosphere mixing process, we achieve the purpose of "whitening".
  E、Wastewater treatment
  1.Domestic sewage treatment
  Biological Aerated Filter (BAF) is a new waste-water bio-film treatment technology, which has a good denitrification and organic matter explanation effect. The biggest feature of BAF technology is the use of a new spherical lightweight porous biological filter, and the growth of bio-film on the surface and open pores. The sewage flows up or down to the filter material layer, and aeration is provided at the lower part of the filter material layer. When the sewage flows through the filter material with bio-film on the surface, the organic matter and nitrogen will be degraded. Meanwhile, the bio-film layer will intercept the SS in the sewage and the aging bio-film and separate the bio-film. Regular using of treated water to backwash the filter can remove the retained SS and aging and shedding bio-films and promote the falling off of the bio-film on the surface of the filter material, which offers direct contact with sewage from highly active fresh bio-films. Thus, the degradation rate and efficiency have been improved, and the effluent can be stabled up and meet the standard.
  2.Industrial waste-water treatment
  The commonly used treatment methods for industrial waste-water can be divided into four major categories: physical treatment, chemical treatment, physical and chemical treatment, and biological treatment.
  (1)Physical treatment: It realizes the separation and recovery of pollutants which is insoluble to and floating in the waste-water (including oil film and oil beads). The commonly used treatment methods: gravity separation, centrifugation, filtration, etc.
  (2)Chemical treatment: You may add a certain kind of chemical substance to the sewage, and use the chemical reaction to separate and recycle the pollutant in the sewage. The commonly used treatment methods: chemical precipitation, coagulation, neutralization, redox (including electrolysis) and so on.
  (3)Physical and chemical treatment: You may use both physical and chemical method to remove pollutants in waste-water. The commonly used treatment methods: adsorption, ion exchange, membrane separation, extraction and so on.
  (4)Biological treatment: Through microbial metabolism, the organic contaminants in the wastewater, which are in solution, colloid, and micro suspended state, can be converted into stable and harmless substances. Commonly used treatment methods: Aerobic biological treatment and anaerobic biological treatment。
  3.Purification and treatment of wetland and water body
  Wetlands refer to natural or artificial swamps and other shallow water areas with stationary or floating water bodies. Wetlands and forests and oceans are also called the three largest ecosystems in the world. Constructed wetland, river control, water landscape, lake regulation and other projects are designed and implemented for the treatment of sewage, water purification, and the renovation of the environment. It possesses a wide range of pollutant removal, which combines effects of physical, chemical and biological treatments to realize water purification.
  We have implemented a lot of projects such as constructed wetlands, river regulation, water landscape and lake renovation in recent years, providing users with specialized engineering services.