Abstract: The application of dry dust removal technology of converter gas can effectively improve the energy conversion efficiency and achieve the purpose of saving new water and saving energy and reducing emission. At the same time, it can greatly reduce water consumption, reduce gas emissions, and steam recycling, which is the key technology for efficient energy conversion in modern times. The application status of converter gas dry dust removal technology, the problems existing in the application process and the application measures are mainly introduced. By studying the process mechanism of vent gas explosion, the design of evaporative cooling tower is optimized to improve the gas and steam recovery efficiency and achieve the goal of efficient use of energy, energy saving and emission reduction. 0 Preface Converter gas dust removal technology can be divided into two kinds of dry and wet methods, of which, dry dedusting technology has the ability to reduce the consumption of new water, improve energy recovery and improve energy efficiency. Therefore, it is more and more widely used in converter gas dust removal process. In the practical application process, due to the technical requirements of the equipment of dry-type dust removal system and the complicated process control, a series of problems occur. Later through the improvement of the system, reducing the occurrence of failures in the dust removal process, but also for the improvement of the system has accumulated rich experience. The successful application of converter gas dry dust removal technology is of great significance to reducing energy consumption and increasing gas recovery rate. A converter gas dry dedusting technology overview Converter gas dry dust removal technology, the most widely used are two methods, namely Lu Qi's LT method and the Austrian steel United DDS method. Among them, the LT method is a gas-wet and dry-dedusting method jointly developed by Luqi and Thyssen in Germany in the late 1960s. Later, Siemens VAI developed the DDS method on this basis. At present, China's domestic companies have also developed a domestic dry-cleaning system. Converter gas dry dust removal system mainly includes gas cooling system, dust removal system and recovery system. In this process, the converter gas of 1400T ~ 1600W passes through the movable hood and the temperature is reduced to about 1000T after the gasification cooling flue recovers the steam. Then into the evaporative cooler for cooling, coarse dust, humidifying quenching and tempering, the final temperature will be 150 feet ~ 500 feet, the dust concentration from 80 ~ 150g / m2 reduced to 40 ~ 55g / m2. After the gas through the electrostatic precipitator, the dust concentration was further 10mg / m2. For the entire system, the impact of the main dust removal device has two, namely, evaporative cooler and electrostatic precipitator. 1.1 Evaporative cooler Evaporative cooler as the name suggests is the use of water vapor evaporation cooling principle to work. Compared with the wet dedusting technology, this cooling method greatly reduces the amount of water required for cooling, to achieve the purpose of saving water. At present, the most widely used is the dual fluid mixing gun, the cooling water is sprayed from the central hole of the nozzle, the heated steam is ejected from the annular gap of the central hole, and atomized water is formed at the nozzle orifice. The amount of water sprayed by the computer according to the evaporator cooler inlet and outlet temperature flow control, at the same time, steam can be replaced by nitrogen, so as to achieve the purpose of saving water. 1.2 electrostatic precipitator Electrostatic precipitator is the core of converter gas dry dedusting system, it is a key facility to prevent explosion and control outlet gas concentration. Converter gas often contains 70% of carbon monoxide gas, a flammable gas that explodes easily in the event of air exposure. Therefore, the electrostatic precipitator is designed to be cylindrical, and at the same time installed at the inlet and outlet automatically open and close the explosion-proof valve, on the one hand can make different components of the gas is separated, on the other hand in the event of an explosion, Can enter pressure relief, protect the safety of equipment. Electrostatic precipitator electrode material and the pole with the form for the dust removal effect is very important, with a reasonable form of pole with the quality of qualified electrode materials, in order to better achieve the dust removal effect. 2 converter gas dry dust removal technology application status 2.1 Technical Application Results Practice shows that the use of dry dust removal technology converter gas treatment, the dust concentration in flue gas can be controlled at 30mg / m3 below. The recovery of gas concentration of dust can be stable under the control of 10mg / m3 or less. Its dust removal effect is much better than the wet dust removal technology. However, at present, 90% of the converters in our country use wet dedusting, although the application and promotion of dry dedusting are still far from achieving the goal of energy conservation and emission reduction. 2.2 energy status The energy consumption of the dust removal system mainly includes two aspects of water consumption and electricity consumption. After practice studies have shown that dry dust removal technology can significantly reduce the energy consumption of the dust removal system level. Dry dust removal system, the use of steam cooling device for converter gas cooling, greatly reducing the consumption of cooling water, but also to improve the cooling efficiency, the study found that dry water recycling water consumption is 1/4 of the wet, and consumption Water is wet 1/5. Due to the relatively small resistance of the dry dust removal system, which is only 1/3 of the wet method, the fan power required by the dry dust removal is relatively small, and the electric power consumed is also smaller. 3 converter gas dry dust removal technology improvement measures Converter gas dry dust removal technology has good environmental protection and energy saving effects and economic benefits, but due to the high requirements of converter operation and system control, there are many problems in practical application. For example, the problem of dust explosion venting, fouling of the inner wall of evaporative cooler, as well as the problem of high cost of ash slugging system.
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