Shougang International Engineering Company sintering design professionals continue to sum up and learn sintering engineering design and production experience and technical achievements, the formation of a rich accumulation of technology to create a number of core technology sintering process. Sintering produces a large amount of SO2-containing flue gas, accounting for about 40% -60% of the annual emissions of iron and steel enterprises. Controlling SO2 emissions during sintering has become the focus of SO2 emission control in iron and steel enterprises. In the face of the current situation of desulphurization, Shougang International Engineering Co., Ltd. jointly with Shougang Environmental Protection Business Division and Beijing University Environmental Engineering Center set up Beijing Shouke Xingye Engineering Technology Co., Ltd. to undertake sintering desulphurization project. Technical team for the Shougang 360m2 sinter sinter desulfurization project, through several domestic desulfurization process to conduct a comprehensive inspection, after a comprehensive analysis, to determine the tower to take the tower desulfurization technology; desulfurization facilities put into operation stable, desulfurization efficiency of 95%, each year can Save the cost of SO2 sewage about 6.48 million yuan, with good economic and environmental benefits. A flue gas desulfurization R & D background At present, the SO2 desulfurization of sinter flue gas in our country is in the initial stage, and only a few sinter plants are equipped with desulphurization facilities. After investigation, the sintering technology team of Shougang International Engineering Company found that domestic sintering desulphurization facilities are not ideal. The current use of several desulfurization tower has the following deficiencies: (1) spray tower, widely used in industrial flue gas desulfurization; domestic thermal power plants have been built desulfurization facilities basically take the technology. Tower hollow, not easy scaling, resistance is small, highlighting the shortcomings of low mass transfer coefficient, the phase boundary area is small, large spray tower, high investment. (2) packed tower, the mass transfer coefficient slightly larger than the spray tower; fluid resistance larger, and the gas-liquid interface area is small; easy scaling, scaling cleaning difficulties; high investment. (3) Swirl plate tower, fluid resistance, the tower structure is complex, easy to scale; level requirements are very high 爸? (4) jet absorption tower, working performance and spray tower is similar; the absorbent surface area is small, the tower body compared to the other three more large, high investment. 2 desulfurization process to determine 2.1 process to determine the principle Desulfurization project to determine the program, we must follow the following principles: safe, reliable, economical, applicable and in line with national conditions; technology is mature, advanced, economical and reasonable, industrial performance of the process system; control project cost, try to consider the localization of equipment; water conservation ; Burning equipment capacity to adapt to changes in load requirements; Consider the sulfur content of coal, sulfur content of the process of raw materials, SO2 control planning and environmental requirements; Consider the supply conditions of desulfurization agent; Desulfurization by-products, desulfurization ash, fly ash Comprehensive reuse; give full consideration to wastewater, waste emissions; give full consideration to the site, layout and other factors. Shougang Qiangang sinter desulfurization project for the old plant new environmental projects, drawing on mature flue gas desulfurization technology at home and abroad; based on the characteristics of flue gas and the actual requirements of the desulfurization and dust removal system, the commonly used wet and several (semi) dry The characteristics of flue gas technology and technical and economic analysis done, and finally determine the tower to deal with the tower. 2.2 close-phase tower technology features 2.2.1 dense dry tower desulfurization principle Dense coke tower flue gas desulfurization technology by the German Fu Han combustion Technology Co., Ltd. and Beijing University of Technology Environmental Engineering Center for China's development of an advanced technology. With the advantages of high desulfurization efficiency, low investment and operating costs, high reliability, low energy consumption, small maintenance, small footprint and long system life, it is mainly used for discharging fumes from various thermal Power Plant boilers, industrial boilers and industrial kilns Gas desulfurization purification treatment. The main principle of the use of water after the election of desulfurization agent slurry, with a large bag of dust under the cycle of ash into the humidifier within the homogenization, the moisture content of the mixed ash to maintain between 3% to 5%, due to contain 3 % ~ 5% moisture cycle ash has excellent fluidity, the reaction tower is equipped with a mixer, not only to overcome the problem of sticky wall but also enhance the role of mass transfer. Humidified after a large number of circulating ash from the upper part of dry tower into the tower, with the upper part of the reaction with SO2 flue gas. Desulfurizer continuous cycle, desulfurization efficiency up to 95%. The final desulfurization by-product from the ash discharge circulatory system, through the delivery device into the waste warehouse. The entire process includes SO2 absorption and absorbent recycling of two processes: (1) Absorption of SO2: The flue gas enters the tower from the upper inlet of the dry tower and reacts with the absorbent in the tower. The flue gas after the reaction is discharged through the outlet of the flue at the lower part of the tower, and is discharged to the atmosphere after dust is removed by the bag filter . (2) Recycling of absorbent: the reaction products falling down in the in-phase dry tower, the circulating ash collected by the bag filter and the new absorbent slurry are lifted by the hoist into the upper part of the tower and re-enter the dry tower to perform a series of Desulfurization physicochemical reaction. 2.2.2 The main features of dry tower (1) low utilization of desulfurization agent, the desulfurizer particles in the cycle process under the action of the stirrer, constantly exposed a new surface, the desulfurization reaction continued to fully carry out, SO2 removal efficiency of 95%, and can be removed HCl, HF and the like; (2) Low water consumption, less water used to increase the activity of the desulfurizer through humidification, and the moisture content of the desulfurizer is usually 3% to 5%; (3) The stirrer in the reaction tower strengthens the homogenization process, prolongs the desulfurization reaction time and ensures the system operation quality; (4) The ability of the system to adapt to changes of flue gas and load with different SO2 concentrations is extremely strong, which is a significant advantage of this technology. (5) desulfurizer in the desulfurization process are in a dry state, the operating temperature is higher than the dew point, no corrosion or condensation, no waste water; (6) dense coherent tower made of ordinary steel, and without the special anti-corrosion measures such as alloy, paint and rubber lining; (7) The flue gas can be discharged without reheating. (8) desulfurization by-product main components: Froling Boiler,Waste Heat Boiler,Crop Waste Boiler,Waste Recovery Boiler Jinan Boiler Group Co., Ltd. , https://www.jinanboilergroup.com
Research and Application of Flue Gas Desulfurization Technology in 360m2 Sintering Project of Shougang Company