Chimney butterfly valve overview and structural characteristics

In the nickel melting system and supporting flue gas chemical products pipe network, the flue butterfly valve is mainly used for regulating the flue gas generated from pyrometallurgical processes (such as flash furnace, converter, copper synthesis furnace, oxygen-rich top-blown melting furnace or Flue gas produced by a depletion furnace). Concentrate drying is one of the major processes for material preparation in a smelting system. The process is to mix the wet concentrate from 8% to 10% of the beneficiation water and the hot coal produced from the combustion of the pulverized coal. After the "three-stage" To ≤ 013% water content of dry concentrate. Flue gas acid plant mainly includes purification, conversion, dry suction and acid storage unit. Smelting flue gas and sulfuric acid used in flue gas temperature and catalyst dust larger, on the pipeline valve corrosion and retardation effect. Smelting and acid pipe network with the flue butterfly valve should be based on the conditions of its use of structural design to avoid the valve wall due to thermal deformation and gray cement blockage caused by blocking the flue valve can not be opened and closed normally affect the smelting chemical equipment normal operation. Structural characteristics of the butterfly valve from the standard analysis and the actual use of the situation, the flue butterfly valve for media truncation or regulation, the sealing performance requirements and metal seal butterfly valve there are some differences. As pipe dust flue gas control equipment, in the closed position still leave some gaps will not affect the regulation of the opening of the furnace to achieve automatic control of furnace pressure. Flue butterfly valve and metal seal butterfly valve fluid characteristics similar to the relationship between the butterfly valve opening and the flow rate is basically a linear relationship. If used to control the flow, its flow characteristics and the supporting pipe flow resistance coefficient is closely related. If the two pipe installation valve diameter and form exactly the same, and the pipe loss factor is different, the valve flow difference will vary greatly. If the valve is in a state of large throttling amplitude, when the butterfly plate is in the middle opening, the upper and lower sides of the butterfly plate may form completely different states during the closing process. The front end of the butterfly plate flows along the medium and the other side Inverse flow of media and move. Therefore, the valve body on one side forms a nozzle-shaped opening with the butterfly plate, and the other side is similar to the orifice-shaped opening. The nozzle side has a much faster flow rate than the throttling side, and the throttling side tends to generate negative pressure. Therefore, Road butterfly valve should be installed horizontally on the nozzle side of the lower part of the pipeline can be connected to prevent the occurrence of gray plugging. Flue butterfly valve mainly from the closure and regulation of flow, especially the large-diameter butterfly valve, the working conditions affect the valve deformation and deformation of the more difficult to control, so the structural design should take into account environmental factors. Flue butterfly valve radial seal and metal seal butterfly valve structure is similar to the temperature of the application process easy to produce thermal resistance, affecting the valve opening and closing. Flue butterfly valve seal to the plane seal is ideal, can be designed as a vertical plate or inclined plate structure (as shown), the valve body, butterfly plate to the side plane for the sealing pair. The diameter of the disc can be smaller than the diameter of the valve body, even if the wall of the valve cavity has a bond can be easily opened. Pipe deformation on the main valve sealing performance without radial sealing effect is obvious. The structure of the sealing surface of the valve body symmetry requirements are high, especially the inclined plate structure of its body sealing side of the plane in the ordinary machinery and equipment difficult to process, must arrange a reasonable process to make the assembly accuracy to achieve the desired sealing effect. If the plane seal structure using leveraged, regardless of the vertical plate or inclined plate structure can solve the seal plane in the process of existing problems. The structure has many advantages, the lever structure of the valve sealing surface sealing side, will not produce radial jamming. In addition, the valve body and the butterfly seal side plane for the continuous plane overall processing, disc design is smaller than the diameter of the valve body diameter. The process of turning off the disc first turns the sealing surface to press and tighten further. When the disc is turned on, the disc rotates first and then it will not jam. Flue butterfly valve is generally in the low pressure, high temperature environment work, will not affect the valve opening and closing. Search Keyword: More Valve Technical Articles