Small and medium boiler smoke pollution has been resolved

Harbin Aircraft Industry Group Co., Ltd. and Harbin Institute of Technology signed a commercial contract for high-efficiency coal-fired flue gas pollution control technology this week, and is currently preparing preliminary design work. At this point, the technology has been rapidly applied to eight industrial boilers in more than one year. These demonstration applications provide a solution to the elimination of smoke pollution from small and medium industrial boilers.
According to preliminary estimates, even after the application of this technology, the eight boilers can reduce sulfur dioxide emissions by more than 1,000 tons per year and reduce dust emissions by more than 100 tons per year.
High-efficiency coal-fired flue gas pollution control technology is the third generation of semi-dry flue gas desulfurization technology developed on the basis of absorbing and learning from the traditional flue gas circulating bed flue gas desulfurization technology. It is a flue gas purification technology based on the principle of compound jetting. Through the staging and segmentation of the desulfurization tower, the system optimization of the sulfur dioxide removal process can be realized, and the space utilization rate and the removal efficiency of the desulfurization tower can be effectively improved. Using this technology, when the ratio of calcium to sulfur is 1.2~1.3, more than 90% of system desulfurization efficiency can be achieved.
The technical device adopts a multi-stage spray tower structure, which can effectively improve the load adaptability of the desulfurization tower, so that the load adaptability of the semi-dry flue gas desulfurization technology can be increased from the original 60% without any additional aids. To 40%. It adopts four patented technologies with independent intellectual property rights, which can form an efficient internal circulation, increase the efficiency of desulfurization and utilization of absorbents, simplify the tower structure, and reduce equipment costs. By using this result, it is also possible to use desulfurization of spent alkali liquor and other alkaline waste water, save water resources and reduce waste water treatment costs according to site conditions, so as to realize resource conservation and waste treatment.
It is understood that the new type of flue gas desulphurization technology introduced by Harbin Institute of Technology has passed the provincial-level scientific and technological achievements appraisal in 2008, and it has been confirmed that it has reached the leading level in desulfurization technology of industrial boilers.
The reporter learned that among the major sources of sulfur dioxide emissions in China, small and medium-sized coal-fired boilers account for more than 40% of total emissions. Solving the problem of smoke pollution in small and medium-sized industrial boilers has become an important task for energy conservation and emission reduction. After nearly 40 years of development, China's coal-fired flue gas pollution control technologies have all kinds of mainstream technologies. In recent years, some foreign R&D institutions are also keen to find “test plots” for new technologies in China. Due to the relatively high cost of flue gas desulfurization technology equipment and operation, both domestic and overseas are seeking technological breakthroughs with simple structure and low cost.
News links Since 1998, China's total sulfur dioxide emissions have exceeded the United States, ranking first in the world. Although the country has done a lot of work in the control of sulfur dioxide pollution since 2000, due to the rapid increase in the amount of coal burned, the total amount of sulfur dioxide emissions in China in 2008 still reached 23.21 million tons, which is nearly double the environmental capacity limit.
At present, the technology for controlling coal-fired sulfur dioxide pollution can be divided into four categories: desulfurization before coal combustion, desulfurization during combustion, desulphurization after combustion, and desulfurization during coal conversion. Among these four types of desulfurization technologies, flue gas desulfurization is considered to be the most effective way to control sulfur dioxide pollution, and is currently the only large-scale commercialized desulfurization technology in the world.
Post-combustion flue gas desulphurization is the treatment and removal of sulphur dioxide in the flue gas produced after coal combustion. Coal desulfurization before coal combustion is called “coal desulfurization”. Coal is purified through various methods to remove impurities such as sulfur and ash contained in raw coal. The desulphurization during combustion is to add limestone powder and other desulfurizers during the combustion process of the coal, and react with the sulfur dioxide in the flue gas to generate sulphate, which is discharged as ash. Coal desulphurization in the conversion process of coal refers to the conversion of coal into gas or liquid fuel by chemical methods, and purifying it during the conversion process.
According to whether or not the desulfurization process adds water and the dry and wet state of the desulfurization products, the flue gas desulfurization technology can be divided into wet process, semi-dry process, and dry process. The wet desulfurization technology is mature, high in efficiency, low in calcium-sulfur ratio, reliable in operation, and simple in operation. However, the treatment of desulfurization products is inconvenient. The decrease in the flue gas temperature is not conducive to diffusion, the process is relatively complex, and the area and investment are large. The desulfurization products of dry and semi-dry methods are dry powdered, easy to handle, simpler in process, generally lower in investment than traditional wet methods, but the dry process using lime (limestone) as desulfurizer has a high ratio of calcium to sulfur, and the desulfurization efficiency is high. The utilization of desulfurizers is relatively low.


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