Blast furnace gas bag filter technology is the 21st century blast furnace to achieve energy conservation, clean production of important technical innovations, can significantly reduce the iron production process of a new water consumption, reduce environmental pollution,January 2007, the Chinese self-developed dry-type blast furnace gas low pressure pulse bag filter to move steel in blast furnace No. 2 (2650m3) was successful, completely abolished the reserve gas wet dust removal system. Research and development of the gas temperature control, dust dense phase pneumatic conveying, corrosion and other pipeline system core technology, the Chinese blast furnace gas in a large dry bag filter to reach the international advanced level.

  Optimize integrated processes and system configuration
At home and abroad through research and analysis of blast furnace gas bag filter technology practice, pressurized gas cleaning dust dust removal technology and low-voltage pulse technology was systematic comparative study, design and development of the blast furnace gas from low pressure pulse bag filter process. Moved to No. 2 blast furnace of steel with a diameter of 4600mm 14 of dust box, box for the two-column layout, two box set raw gas and the middle of the net gas pipeline, gas pipeline flow rate according to principles such as design, so access to the box Uniform distribution of the gas volume, the whole process of the system layout is compact, short-Jie smooth flow, equipment repair and maintenance facilities. Low filtration rate design to ensure a safe and reliable operation. Each box set filter bag 250, bag size <160mm × 7000mm, single-box filter area 880m2, total filtration area of 12320m2. Design increased the diameter and length of the bag, high-diameter ratio lower, more reasonable size bag structure; expanded box diameter, so that dust unit processing capacity, reduce the number box, construction investment, and covers an area of . Table 2 is the transfer of steel No. 2 blast furnace gas bag filter technology parameters.

  Gas temperature control technology Gas temperature control is the key element of bag filter , normal state, the gas temperature should be controlled at 100 ~ 220 , gas temperature is too high, too low will affect the normal operation of the system. Use of bag filter dry gas, blast furnace operation to attach greater importance to the regulation of furnace top temperature control. Roof to take roof temperature cooling of atomized water spray, while blast furnace waste gas pipeline set heat pipe heat exchanger, water as a cooling medium, the hot gas heat transfer through the heat pipe, so water vapor absorption of gas heat gas temperature can be controlled effectively solve technical problems. Gas temperature control should be taken to improve the quality of raw material and fuel into the furnace, furnace cooling equipment to enhance monitoring, control the furnace top temperature, waste gas pipe insulation and other technical measures, in the blast furnace, when the complex wind to take effective measures to reduce the gas water content, so that gas temperature above dew point control. Research and development of gas being high-low temperature heat transfer technology quickly, so that gas temperature, low temperature can be controlled effectively.

  Gas dust content in-line monitoring Gas dust content in-line monitoring device is monitoring of blast furnace gas bag filter system is running a major test equipment, research and development of the blast furnace gas dust content in-line monitoring system using charge induction principle. In the flow of powder, granules and particles, particles with the wall, due to friction between particles and cloth, collision, electrostatic charge, the formation of electrostatic field, electrostatic field changes its dust content can reflect the changes. Gas dust content in-line monitoring system by measuring the change in electrostatic charge to determine whether the bag filter system is running properly. When the bag damage, the pipeline gas and solid two-phase increase in dust content, while the amount of electrostatic charge increases, and insert the sensor box output channel can be detected in time to charge money and output to the transmitter to achieve gas containing Automatic monitoring of dust [2]. Moved to No. 2 blast furnace steel dust content in-line gas monitoring device for the sensor surface using a special coating material, to avoid the blast furnace gas in the water because lead dust from the sensor surface bonding, thereby enhancing the detection accuracy of the device and stability to address the large blast furnace gas dust content of dry dust removal system online monitoring of technical problems.

  Gas pipeline systems corrosion technology
  Production practices found by BF gas dry bag filter, the net gas in the chloride ion content was significantly increased. This is mainly due to fuel the blast furnace of the original halide, formed in the blast furnace gas of HCl, when the gas temperature reaches the dew point, the gaseous HCl and the condensation of water, forming hydrochloric acid. Examination and analysis of gas condensate through the discovery, the pH value below 7, and sometimes even up to 2 to 3, strongly acidic, the gas pipe and corrugated compensator has a strong corrosive, resulting in abnormal gas pipeline systems corrosion. Gas pipeline system in order to prevent the abnormal corrosion of the gas pipeline corrugated compensator material, the structure of technical research and material improvements for the 800 series from the 316L, improved corrosion resistance; gas pipeline inside wall of the anti-corrosion coating treatment; in net gas pipeline set sprinkler or sprinkler system, lye and other technical measures, after a year of production practice has achieved remarkable results.